blue blocker lcd panel test factory

In the past decade, LCD monitors have replaced CRT screens for all but the most specialist applications. Although liquid crystal displays boast perfect

Important technical improvements of LCD, such as LED backlighting and wide viewing Angle, are directly related to LCD. And account for an LCD display 80% of the cost of the LCD panel, enough to show that the LCD panel is the core part of the entire display, the quality of the LCD panel, can be said to directly determine the quality of an LCD display.

The production of civil LCD displays is just an assembly process. The LCD panel, the main control circuit, shell, and other parts of the main assembly, basically will not have too complex technical problems.

Does this mean that LCDS are low-tech products? In fact, it is not. The production and manufacturing process of the LCD panels is very complicated, requiring at least 300 process processes. The whole process needs to be carried out in a dust-free environment and with precise technology.

The general structure of the LCD panel is not very complex, now the structure of the LCD panel is divided into two parts: the LCD panel and the backlight system.

Due to the LCD does not shine, so you need to use another light source to illuminate, the function of the backlight system is to this, but currently used CCFL lamp or LED backlight, don’t have the characteristics of the surface light source, so you need to guide plate, spreadsheet components, such as linear or point sources of light evenly across the surface, in order to make the entire LCD panel on the differences of luminous intensity is the same, but it is very difficult, to achieve the ideal state can be to try to reduce brightness non-uniformity, the backlight system has a lot to the test of design and workmanship.

In addition, there is a driving IC and printed circuit board beside the LCD panel, which is mainly used to control the rotation of LCD molecules in the LCD panel and the transmission of display signals. The LCD plate is thin and translucent without electricity. It is roughly shaped like a sandwich, with an LCD sandwiched between a layer of TFT glass and a layer of colored filters.

LCD with light refraction properties of solid crystals, with fluid flow characteristics at the same time, under the drive of the electrode, can be arranged in a way that, in accordance with the master want to control the strength of the light through, and then on the color filter, through the red, green, blue three colors of each pixel toning, eventually get the full-screen image.

According to the functional division, the LCD panel can be divided into the LCD panel and the backlight system. However, to produce an LCD panel, it needs to go through three complicated processes, namely, the manufacturing process of the front segment Array,the manufacturing process of the middle segment Cell, and the assembly of the rear segment module. Today we will be here, for you in detail to introduce the production of the LCD panel manufacturing process.

The manufacturing process of the LCD panel Array is mainly composed of four parts: film, yellow light, etch and peel film. If we just look at it in this way, many netizens do not understand the specific meaning of these four steps and why they do so.

First of all, the motion and arrangement of LCD molecules need electrons to drive them. Therefore, on the TFT glass, the carrier of LCD, there must be conductive parts to control the motion of LCD. In this case, we use ITO (Indium Tin Oxide) to do this.ITO is transparent and also acts as a thin-film conductive crystal so that it doesn’t block the backlight.

The different arrangement of LCD molecules and the rapid motion change can ensure that each pixel displays the corresponding color accurately and the image changes accurately and quickly, which requires the precision of LCD molecule control.ITO film needs special treatment, just like printing the circuit on the PCB board, drawing the conductive circuit on the whole LCD board.

This completes the previous Array process. It is not difficult to see from the whole process that ITO film is deposited, photoresist coated, exposed, developed, and etched on TFT glass, and finally, ITO electrode pattern designed in the early stage is formed on TFT glass to control the movement of LCD molecules on the glass. The general steps of the whole production process are not complicated, but the technical details and precautions are very complicated, so we will not introduce them here. Interested friends can consult relevant materials by themselves.

The glass that the LCD board uses makes a craft also very exquisite. (The manufacturing process flow of the LCD display screen)At present, the world’s largest LCD panel glass, mainly by the United States Corning, Japan Asahi glass manufacturers, located in the upstream of the production of LCD panel, these manufacturers have mastered the glass production technology patents. A few months ago, the earthquake caused a corning glass furnace shutdown incident, which has caused a certain impact on the LCD panel industry, you can see its position in the industry.

As mentioned earlier, the LCD panel is structured like a sandwich, with an LCD sandwiched between the lower TFT glass and the upper color filter. The terminal Cell process in LCD panel manufacturing involves the TFT glass being glued to the top and bottom of a colored filter, but this is not a simple bonding process that requires a lot of technical detail.

As you can see from the figure above, the glass is divided into 6 pieces of the same size. In other words, the LCD made from this glass is finally cut into 6 pieces, and the size of each piece is the final size. When the glass is cast, the specifications and sizes of each glass have been designed in advance.

Directional friction:Flannelette material is used to rub the surface of the layer in a specific direction so that the LCD molecules can be arranged along the friction direction of the aligned layer in the future to ensure the consistency of the arrangement of LCD molecules. After the alignment friction, there will be some contaminants such as flannelette thread, which need to be washed away through a special cleaning process.

After the TFT glass substrate is cleaned, a sealant coating is applied to allow the TFT glass substrate to be bonded to the color filter and to prevent LCD outflow.

Finally, the conductive adhesive is applied to the frame in the bonding direction of the glass of the color filter to ensure that external electrons can flow into the LCD layer. Then, according to the bonding mark on the TFT glass substrate and the color filter, two pieces of glass are bonded together, and the bonding material is solidified at high temperatures to make the upper and lower glasses fit statically.

Color filters are very important components of LCD panels. Manufacturers of color filters, like glass substrate manufacturers, are upstream of LCD panel manufacturers. Their oversupply or undersupply can directly affect the production schedule of LCD panels and indirectly affect the end market.

As can be seen from the above figure, each LCD panel is left with two edges after cutting. What is it used for? You can find the answer in the later module process

Finally, a polarizer is placed on both sides of each LCD substrate, with the horizontal polarizer facing outwards and the vertical polarizer facing inwards.

When making LCD panel, must up and down each use one, and presents the alternating direction, when has the electric field and does not have the electric field, causes the light to produce the phase difference and to present the light and dark state, uses in the display subtitle or the pattern.

The rear Module manufacturing process is mainly the integration of the drive IC pressing of the LCD substrate and the printed circuit board. This part can transmit the display signal received from the main control circuit to the drive IC to drive the LCD molecules to rotate and display the image. In addition, the backlight part will be integrated with the LCD substrate at this stage, and the complete LCD panel is completed.

Firstly, the heteroconductive adhesive is pressed on the two edges, which allows external electrons to enter the LCD substrate layer and acts as a bridge for electronic transmission

Next is the drive IC press. The main function of the drive IC is to output the required voltage to each pixel and control the degree of torsion of the LCD molecules. The drive IC is divided into two types. The source drive IC located in the X-axis is responsible for the input of data. It is characterized by high frequency and has an image function. The gate drive IC located in the Y-axis is responsible for the degree and speed of torsion of LCD molecules, which directly affects the response time of the LCD display. However, there are already many LCD panels that only have driving IC in the X-axis direction, perhaps because the Y-axis drive IC function has been integrated and simplified.

The press of the flexible circuit board can transmit data signals and act as the bridge between the external printed circuit and LCD. It can be bent and thus becomes a flexible or flexible circuit board

The manufacturing process of the LCD substrate still has a lot of details and matters needing attention, for example, rinse with clean, dry, dry, dry, ultrasonic cleaning, exposure, development and so on and so on, all have very strict technical details and requirements, so as to produce qualified eyes panel, interested friends can consult relevant technical information by a search engine.

LCD (LC) is a kind of LCD, which has the properties of light transmission and refraction of solid Crystal, as well as the flow property of Liquid. It is because of this property that it will be applied to the display field.

However, LCD does not emit light autonomously, so the display equipment using LCD as the display medium needs to be equipped with another backlight system.

First, a backplate is needed as the carrier of the light source. The common light source for LCD display equipment is CCFL cold cathode backlight, but it has started to switch to an LED backlight, but either one needs a backplate as the carrier.

CCFL backlight has been with LCD for a long time. Compared with LED backlight, CCFL backlight has many defects. However, it has gradually evolved to save 50% of the lamp and enhance the transmittance of the LCD panel, so as to achieve the purpose of energy-saving.

With the rapid development of LED in the field of lighting, the cost has been greatly reduced.LCD panels have also started to use LED as the backlight on a large scale. Currently, in order to control costs, an LED backlight is placed on the side rather than on the backplate, which can reduce the number of LED grains.

At the top of the diffusion plate, there will be 3~4 diffuser pieces, constantly uniform light to the whole surface, improve the uniformity of light, which is directly related to the LCD panel display effect. Professional LCD in order to better control the brightness uniformity of the screen, panel procurement, the later backlight control circuit, will make great efforts to ensure the quality of the panel.

Since the LCD substrate and the backlight system are not fixed by bonding, a metal or rubber frame is needed to be added to the outer layer to fix the LCD substrate and the backlight system.

After the period of the Module, the process is completed in LCM (LCDModule) factory, the core of this part of the basic does not involve the use of LCD manufacturing technology, mainly is some assembly work, so some machine panel factories such as chi mei, Korea department such as Samsung panel factory, all set with LCM factories in mainland China, Duan Mo group after the LCD panel assembly, so that we can convenient mainland area each big monitor procurement contract with LCD TV manufacturers, can reduce the human in the whole manufacturing and transportation costs.

However, neither Taiwan nor Korea has any intention to set up factories in mainland China for the LCD panel front and middle manufacturing process involving core technologies. Therefore, there is still a long way to go for China to have its own LCD panel industry.

We updated this article in November 2022 to ensure the information reflected current prices, features and more. Our top picks, based on testing notes from theGood Housekeeping Institute, remain the same.

Emitted by a myriad of devices from televisions to phones and almost any display, blue light — a certain grade of high-energy light on the color spectrum — is certainly known to disrupt natural circadian rhythms that guide your sleep, as well as trigger headaches after prolonged exposure, per published research. But evidence isn"t detailed enough yet to illustrate how blue light glasses (or blue light-blocking glasses) effectively prevent these symptoms and promote holistic eye health, despite marketing claims that promise these results. If you"re battling chronic headaches or finding your sleep disrupted by late-night work, a pair of blue light glasses may help alleviate some eye strain — though the science of this purported relief remains highly debated among healthcare experts.

To find the best blue light glasses, our health editors collectively evaluated over two dozen brands, making our recommendations based on wearability, comfort, design qualityand any reported symptom relief. We also partnered with a pair of leading optometrists and ophthalmologists to answer top questions about blue light glasses" efficacy and shopping tips for products that reduce blue light exposure over time. You can read more about how we evaluated blue light glasses firsthand at the end of this guide.

Blue light-blocking lenses are accessible for all Warby Parker products, regardless if they use prescription lenses or not, for a $50 surcharge. The brand"s Wright frames are a best-seller for a reason — they"re highly customizable, available in three different widths for a snug fit beneath your crown and come in a variety of finishes and styles that our editors loved. Our review of the Wright noted that Warby Parker"s frames were extremely easy to clean, given the frame"s body is made from durable polished plastic, and that the brand"s polycarbonate lenses are made with scratch-resistant coatings that stood up to daily wear and tear excellently.

While price points are elevated for standalone frames with blue light-blocking lenses alone, you get what you pay for — our review found the available styles produced by Warby Parker fit into most occasions and needs (home or office wear, casual use as well as prolonged wearing) with frames that were built to last.

A solid blend between performance and style, as well as a wider suite of blue light-only frames, Blenders" standalone blue light glasses are a favorite among editors who have worn them. Their unisex sizing model ensures an encompassing fit for most, and the retailers" size guide on its product pages contains some of the clearest fit details we"ve seen. If you"ve yet to wear a pair of blue light glasses during long work hours or late-night projects, Blenders" standalone products feel like the best introduction to the category — you"ll find that tint levels on these frames will help you recognize how much blue light is thrown off from some of your most used electronics.

Known as one of the largest online retailers of prescription eyewear, GlassesUSA was an early adopter in offering blue light-blocking coatings for nearly all of their available frames, regardless of prescription or style. Their proprietary add-on is known as "BLUEASE", according to a brand representative, and can be added onto available frames for a flat fee of $19 — this includes extremely popular styles from brands like Ray-Ban, Oakley, and Persol, among many others. If you"re shopping for corrective eyewear, GlassesUSA has long worked with customers using a wide array of vision insurance providers to lower prices on all of their selections, making shopping for prescription lenses enhanced with blue light add-ons a total breeze.

GlassesUSA doesn"t manufacture blue light frames exclusively since any of its available products are eligible to be upgraded with blue light-blocking features, but it does manufacture its own private-label products, like these oversized unisex frames in its Muse collection. Known as their best-selling frame for women, the Ottoto Bellona above features a very sturdy round build with structural arms that sit comfortably alongside your face. The adjustable silicone nose pads come in handy for a variety of bridge sizes.

If you"re looking for a pair of glasses that"ll blend seamlessly into your office wardrobe — without drawing any wondering looks from colleagues if you don"t regularly wear glasses already — Felix Gray"s offerings are designed for you. A wide range of blue light-blocking styles are made from the brand"s eyewear frames that are also available in prescription lenses for those who need them. The eyeglasses retailer launches seasonal collections frequently, introducing new products like this top-tested Alexander model that first launched in spring 2022; the brand"s Roebling and Nash frames are among the most popular options for those shopping for blue light specs all on their own.

Felix Gray also deliberately offers more than one kind of blue light-blocking lens for each of their popular frames; they"re divided into clear lenses and visibility-tinted amber lenses, which may be best for those who have late-night work routines. Brand materials suggest that Felix Gray"s amber lenses are designed to filter away more than 23 times the amount of blue light compared to other options on the market, and are designed with sleep in mind.

Brand founder Ashley Mariko Johnson tackles the one-size-fits-all issue in eyewear with Mohala, which aims to bolster design to be inclusive of more face shapes and sizes. Johnson designed Mohala offerings by consulting Black, Asian and Hispanic consumers directly, focusing on wider lenses, shorter temple lengths and more room for both natural and synthetic eyelashes. Mohala"s blue light-blocking specs are designed to accentuate square and oval-shaped faces, lower nose bridges and sit comfortably on a range of cheekbone sizes. Customers can easily filter specs by nose bridge options, face shapes, width and more fit options when shopping within Mohala"s online retail space (or locally in Hawaii, the brand"s home state).

The Keana frames provide a comfortable, encompassing fit for those with round, oval and heart-shaped faces, thanks to their spanning width (which is available in two different sizes for those with wider faces). Mohala"s blue light frames, including those on the Keana, perfectly straddle the amount of tint for long-wear use at the office or at home — our tests revealed their light tint is effective in evening hours in dark spaces while preserving color correctness during daylight hours. Multiple stylish finishes for the Keana frame will likely have you picking up more than one pair for year-round wear.

With many size options available in 18 different standalone frames, Ray-Ban makes a wide array of blue light glasses for women in more compact designs using their proprietary Everglasses technology. The classic Wayfarer frame can be ordered in a wide array of sizes up to an XXL, and comes with a universal nose bridge that testers found to be comfortable in extended wear.The photochromic lenses available on Ray-Ban"s blue light glasses shift in tint throughout the day depending on lighting, and are fitted with anti-reflective treatments and UV filters for additional protection.Our tests revealed that those with smaller faces may benefit from Ray-Ban"s petite offerings, which include XS and S sizes, for a fit that won"t have glasses sliding off throughout the work day.

While they"re not available for all prescription levels, Prospek"s highly popular frames loaded with their blue light-blocking lenses are available in a variety of magnification strengths for office use. Our review noted the glasses" lighter amber lenses adeptly shielded against computer use in a number of interior lighting settings. Since these frames are designed to be used with magnification enhancements for ease of reading, the low-profile lens translates into a more business-forward look. While fit wasn"t as snug and steady as other models on this list, Prospek"s blue light-blocking glasses are available in three different sizes at a standard width (just under 6"). Lenses are finished with an anti-glare and anti-fog coating, which makes for easier wear with appropriate face coverings in a shared office setting.

Good Housekeeping editors evaluated blue light glasses firsthand by wearing each pair throughout work days spent in front of laptops, monitors and desktop computers, as well as after-hours activities such as television watching and video game playing. We asked a wide array of editors — all with various head and face shapes and sizes, as well as varying lifestyles and schedules — to review glasses featured in this guide over the span of two consecutive months. They probed if these glasses were comfortable to wear, their performance under frequent use, and reported whether they noticed any reduction in eye strain or other observations during the review process.

As you"ll learn below, there is little to no clinical research or academic evidence to support claims that suggest blue light glasses reduce eye strain or chronic headaches linked to excess screen time all on their own. Blue light glasses often provide subjective comfort to those who choose to wear them — but as there are no manufacturing standards for blue-light blocking lenses established by governing groups like the American Academy of Ophthalmology, our testing solely rested on users" reported feedback on sustained comfort, product durability and self-monitored reactions to extended use of electronics. Eye experts told Good Housekeeping that measuring the efficacy of a pair of blue light-blocking lenses is mired in confusion, as there has yet to be a "gold standard" developed by leading experts in the field of eye care.

A market full of blue light glasses has sprung up over the last few years, with a range of affordable options to prescription-backed designer options that may even be partially covered by your optical insurance. But finding the right pair of blue light glasses can feel overwhelming, as standalone opticals aren"t regulated by any healthcare organization, and distinguishing a well-made pair among low-cost options can be quite difficult. Try to use the following parameters to help you pick the best pair of blue light-blocking glasses when shopping around:

✔️Tinted versus opaque lenses: Without advanced tools and in-the-know experts, it"s impossible to tell how much blue light a pair of glasses is capable of filtering just by looking at them. The best way to see if a pair of glasses actually aim to curtail exposure to electronic light is to examine the tint on the lenses closely; previously published research suggests that amber-tinted shades filter out blue light more effectively than clear, translucent lenses, especially over an extended period of use. Generally speaking, a darker tint equates to more blue light exposure being effectively blocked; while there are clear lenses used in blue light-blocking products, they may not be as effective as a tinted option. Tinted lenses are visible to most consumers when reviewing products in person, but you can ask retailers about the level of tint on their products when online shopping, too.

✔️Fit tests and try-on services:Every face has a different shape, so it"s crucial that you shop for blue light glasses as you would any other kind of eyewear — by trying them on! Some retailers, including Felix Gray and Warby Parker among others, feature direct-to-consumer fit tests that allow you to try on a few different frames to ensure they fit well before purchasing. You want the frames to be comfortable on your face; they can"t be pinching your temples or consistently sliding off your nose if you plan to wear them throughout your work and evening routine. Some retailers offer virtual technology as well, but your best bet is a physical try-on before you buy — try wearing them for at least 10 minutes before you decide on fit.

✔️ Prescription lenses: Nearly all prescription glasses, from reading glasses to bifocals, can be filled by the best retailers with additional layers of blue light-blocking add-on coatings. If you currently wear glasses to correct your vision, you shouldn"t consider separate lenses just for electronic use. While it"s always necessary to discuss any drastic changes to your prescription lenses with your doctor beforehand, most of the retailers featured in this guide offer effective prescription glasses that can be bolstered with a blue light-blocking add-on for a minor cost. You should consider blue light add-ons alongside other options, including anti-scratch and anti-reflective coatings. Don"t forget to ask if your vision insurance can cover some of your costs.

While their popularity has certainly skyrocketed as more people transition into a permanent work-from-home schedule, blue light glasses are controversial among healthcare providers, as there is not enough substantial research data to support their use to reduce eye strain or to help improve sleep. "There is little to no evidence supporting the use of blue-light blocking glasses lenses in promoting eye health," summarizes Rahul Khurana, M.D., a clinical spokesperson for the American Academy of Ophthalmology (AAO). This position is also supported by other leading healthcare organizations like the American Macular Degeneration Foundation.

A landmark review of published research released in 2017 found insufficient evidence to suggest that blue light glasses could improve eye fatigue in any sense, boost overall eye health at all, nor could it work to improve disruptions to sleep patterns. More recently, a 2021 double-blind randomized study published in the American Journal of Ophthalmology took aim at eye strain specifically by organizing 120 symptomatic computer users into two groups; one wearing marketed blue-light blocking spectacles, and others just regular clear lenses.

The most common devices in our offices and homes don"t actually emit enough potentially harmful blue light to cause serious harm associated with this specific light frequency, explains David A. Eichenbaum, M.D., FASRS, a board-certified ophthalmologist and director of research for Retina Vitreous Associates in Florida.

"Blue light generated from LED devices, computer screens, iPhones, even LED light bulbs, is just not bright enough; the lumens aren"t great enough to damage your eyes from a medical standpoint," Dr. Eichenbaum explains. "The Sun emits blue light, and staring at the Sun is obviously bad for your eyes… It"s a pinpoint high luminescence light source. But the blue light from your phone, monitor, or far away from car light bulbs is almost certainly not going to hurt your eyes, as the power of the light is very low."

Blue light emissions from intense sunlight exposure have been linked to macular degeneration, risk of cataracts and some other eye conditions — but electronics aren"t known to emit enough blue light on their own to cause eye strain or serious damage, experts at the AAO have concluded. Where blue light may be more impactful, then, is negatively influencing our circadian rhythms; and late-night computer, phone and television users often experience disruption in their natural sleep cycle.

"Sleep is where blue light is likely an issue; while there isn"t ophthalmic evidence, blue light likely messes with your circadian rhythm, [especially] if you"re using a lot of blue screens at night," Dr. Eichenbaum says. "It"s good to not sit on your phone at night, or instead read a book with a yellow light… or, use your blue light glasses, if you have them. That would be the [most] appropriate time to use them."

While blue light glasses may indeed be most effective in the evening hours, Dr. Khuruna adds that many of the best electronics today have settings to limit blue light emissions in the evening. Using these settings and new features may have the same counter effect against blue light exposure at this time of night. Blue light glasses and brightness reduction technology are just two options for working to reset your circadian rhythm and other DIY sleep enhancement tips.

Blue light may not be the main culprit behind eye strain caused by digital exposure, but more Americans are indeed feeling the impact of spending more time than ever in front of screens, according to Dr. Khurana.

"The normal blink response is about 15 blinks per minute… when you"re reading or looking at a screen, that goes down to about five per minute. So as a result, when you"re not blinking as much, your eyes dry out, which makes them itchy and irritated," he says. "And trying to focus too hard may also cause headaches, fatigue and blurred vision. The really big issue we"re dealing with is digital eye strain, and blue light blocking glasses have done nothing to really minimize that, according to available data."

Blue light glasses may indirectly remind you to blink at an increased frequency, or practice better habits when working in front of a computer or sitting behind a screen. AAO officials make the following recommendations in order to reduce the risk of eye strain over time:Sitting at least an arm"s length away from the screen in question, if not further.

Zee has been shopping and wearing blue light glasses without prescription lenses since November 2018, and has worn blue light-blocking lenses consistently on weekdays beginning in July 2020 in the hopes of stemming eye strain caused by increased exposure to digital screens outside of work hours. He coordinated testing for this guide in 2022 and has personally reviewed each of the pairs listed above, as well as solicited feedback from editorial staff members who participated in hands-on review.

In our modern world, people spend more time than ever in front of screens. In fact, nearly one-third of adults report being online almost constantly throughout the day. Despite its many advantages, this explosion in digital gadgets also comes with a price. Your computer screen, tablet, and smartphone all emit high-energy blue light similar to the sun. When you use these digital devices into the late hours of the evening, the blue light exposure can disrupt your sleep-wake cycle.

To combat the effects of screen time before bed, more and more companies are offering glasses with special lenses that can block blue light from reaching your eyes. These blue light blocking glasses offer a safe and drug-free way to make sure late-night screen time and artificial lighting don’t affect your sleep.

Blue light blocking glasses are a fairly new type of technology, and the industry lacks a clear set of regulations to guide shoppers. Whether you’re a gamer or just need to get some work done on your computer before bed, we’ll help you sift through the marketing claims to find the best pair of blue light blocking glasses for your needs.

EyeBuyDirect (EBD) takes an unconventional approach to blue light blocking glasses. Customers can choose from more than 1,400 different frame styles, then select the type of blue light blocking technology they’d like for their eyewear depending on their preferences and needs.

EBDBlue Plus technology includes advanced blue light blocking, UV protection, an anti-static layer to safeguard the glasses from dust, and a lens coating to reduce smudging. EBDPlus 360 builds on this by offering the same features as EBDBlue Plus as well as a special coating that minimizes reflections by as much as 50% during the day. The innovative EBBBlue Smart option enables the lenses to automatically adjust based on natural light and darkness levels. Lastly, SightRelax glasses have a slight magnification at the bottom of the lenses to improve vision and ease discomfort for gamers, E-readers, and other people with screen-centric lifestyles, as well as employees and students who spend most of their day using a computer.

The Ocushield Anti Blue Light Glasses are comfortable and lightweight yet highly effective at protecting your eyes. The lenses are designed to block up to 99% of UV rays and blue light emissions with wavelengths that fall between 300 and 400 nanometers (nm), as well as 40% of emissions in the range of 400 to 470 nm. This makes them well suited to late-night workers and other people who need to use electronic devices before bed.

Felix Gray offers a wide range of frames for blue light glasses. Each of the brand’s 17 adult-friendly styles are designated as narrow, medium, and/or wide, so you can make a selection based on what will fit most comfortably. Four of the frames are designed for “low bridge” noses that sit below the pupils. You can choose between clear or amber lenses depending on your personal preference, and most of the frames are available in at least two to three different colors.

The Nash, Roebling, and Faraday designs are also available in kid sizes for age ranges of 4 to 8 years or 9 to 13 years. The lenses for every Felix Gray style have been treated with a proprietary anti-glare coating intended to reduce blue light exposure by as much as 98%. You can arrange for the glasses to match your existing prescription. Most styles are also available as reading glasses.

While blue light blocking glasses can improve your melatonin levels and help you sleep soundly, it’s important to note that some blue light is essential for a balanced sleep-wake cycle. The Day Swannies from Swanwick are designed to block wavelengths ranging from 400 nm to 450 nm, which is considered the most harmful range across the blue light spectrum. Wavelengths between 450 nm and 500 nm pass through the lenses, keeping you alert as you go about your day without incurring too much blue light exposure.

People who typically use computers, tablets, and other screen devices for their profession are great candidates for the Day Swannies. The lenses are fairly clear, and aren’t as tinted as many of their counterparts on the market today. This makes the glasses less suitable for nighttime use — Swanwick sells a separate “orange lens” collection with stronger blue light blocking capabilities — but you can wear them throughout the day as you use electronic devices. Each pair is equipped with a pair of spring hinges, giving the frame a flexible feel.

LOOK OPTIC is an eyewear company that produces a line of Blue-Light Readers designed to block blue light from your gadgets. Since LOOK OPTIC specializes solely in readers, these glasses are a good choice for shoppers who are in the market for reading glasses but do not necessarily need prescription eyewear.

While some blue light glasses feature lenses that are coated with a blue light-blocking film, the Blue-Light Reader features a proprietary RetinaShield Blue lens that directly filters out blue light without the use of a film, which can erode over time. The lens is made of CR-39 material and is designed to resist scratches, which helps preserve the integrity of the light filtering function. Shoppers can choose between five magnification options, from zero to 2.5. Those who aren’t sure of their ideal magnification can consult an eye chart provided on the LOOK OPTIC website.

If you are selective about how your readers look, the Blue-Light Readers are available in eight different styles — and each style comes in a wide variety of colors. All glasses are lightweight and feature spring hinges that can be easily adjusted for a good fit.

LOOK OPTIC provides free shipping and returns within the contiguous U.S. Customers receive a 90-day trial to test out the readers. Those who are dissatisfied may return the readers for a full refund. The glasses are also backed by a 1-year warranty.

Many brands offer blue light glasses designed for women, but Sojos Vision exclusively caters to this demographic. The company’s current selection of blue light glasses includes nearly 150 different styles. You can filter the results to choose by color, frame type, full- or semi-rim shape, and size in order to find the perfect fit.

Sojos Vision uses photochromic lenses engineered to not only block most blue light but also automatically adjust to transitioning light conditions at different times of the day. After choosing your frames, you can customize the lenses based on personal needs. Options include “single need” for nearsightedness or farsightedness, progressive lenses that correct both of these conditions, readers, or non-prescription if you just want the benefits of blue light glasses.

If you’re in the market for blue light blocking glasses but aren’t sure which design best suits you, Peepers offers an unparalleled selection of frame styles. The current lineup features 100 individual models that vary in terms of weight, dimensions, shape, and color. Choose from minimalist looks, throwback styles, and more colorful options. All pairs are designed to filter blue light and block up to 99.9% of UV rays.

The Teen Blue Light Glasses from Jonas Paul Eyewear are a low-cost option for high school students and young adults. The lenses in each pair are engineered to block roughly 56% of blue light with wavelengths of 380 to 450 nanometers, the range that has been shown to negatively impact circadian rhythm the most. However, the lenses won’t hinder exposure to blue light with a wavelength of 460 to 500 nanometers, which promotes healthy sleep and mood regulation.

The Teen Blue Light collection includes four different designs for teens who don’t normally wear prescription glasses. The Vint, Charlie, Margaret, and Katherine styles are all available in three color and design options. Your teen can visit the product page of each set of frames and use the “Virtual Try-On” feature to see how they look. This eliminates the need for testing out the frames in person. Each style has different lens and bridge measurements.

All Teen Blue Light frames carry the same affordable price-point and standard ground shipping is available anywhere in the U.S. You can also opt for expedited delivery. Returns are accepted within 30 days of receipt.

Blue light refers to a specific wavelength in the visible spectrum. The visible spectrum encompasses all the light wavelengths that the human eye can see, including the entire rainbow of colors from red to violet. Among the visible colors, blue light has a relatively short wavelength and delivers high levels of energy to the eye.

Blue light is very common. When you go outside, your eyes are awash in blue light coming from the sun. Artificial sources of blue light are also ubiquitous in modern life. From fluorescent and LED lighting to all of the various screens we use, we’re frequently bathed in blue light from morning to night.

While blue light during the day plays a positive role in regulating our sleep-wake cycle, too much exposure to blue light in the evening can disrupt sleep patterns for children and adults alike. One solution is to end screen time several hours before bed. But for those who don’t want to give up their nightly gaming session or Twitter scroll, blue light blocking glasses can help shield your eyes from this high-energy wavelength in the evening.

With hundreds of options on the market, choosing the right pair of blue light blocking glasses can seem like a daunting task. It’s key to arm yourself with an idea of your own preferences, as well as a basic understanding of the science behind blue light blocking glasses.

From fit and color to cost and customer service policies, keeping certain key factors in mind can help you narrow down your choices when shopping for blue light blocking glasses.

Light BlockingBlue light blocking glasses come in a range of different light blocking abilities. Consider what time of day you’ll be using your blue light glasses, and how much blue light blocking you really need. Glasses with red- or orange-tinted lenses block a wider spectrum and larger percentage of blue light. However, they can also distort the colors on your computer screen. Clear or light yellow-tinted glasses are designed to target a narrower range of high-energy blue light commonly emitted from artificial sources. These may be more appropriate for daytime use.

Shape and WeightTo be able to read, complete computer work, or play games comfortably for several hours in the evening, you’ll need a pair of blue light blocking glasses that suits the shape of your face and doesn’t feel cumbersome. If you already wear prescription glasses, consider finding a pair of blue light blocking glasses that are large enough to comfortably sit over your current glasses. Many people also prefer glasses that are lightweight, so be sure to check the weight of your chosen model before purchasing.

Size OptionsFor the best chance at finding a pair of blue light blocking glasses that fit your face, you’ll want to search for a model that offers multiple size options. Before buying, try them on or double-check the dimensions. Two of the most important measurements to take note of include the width of your face and nose.

Style & Color OptionsBlue light blocking glasses are available in many different colors and styles. Some manufacturers sell glasses in packs of two or three so you can switch the glasses to suit your current mood. If style is important to you, you may prefer to opt for glasses with less of a yellow tint, bearing in mind that this style generally allows a greater percentage of blue light to reach your eyes.

Trial & Return PolicyIf you’re ordering your blue light blocking glasses online, it’s important to find a model that comes with a generous trial period or return policy. Eyewear is very personal, and if you’re not able to try on a pair of glasses before you make your purchase, it’s nice to be able to return them in the event they don’t fit properly or the color and style aren’t what you expected.

CostBlue light blocking glasses can cost anywhere from $15 to $50, with many models around the $20 price-point. More expensive glasses may offer additional features, such as more unique style options or a greater percentage of blue light blocked. When shopping for blue light blocking glasses, you’ll have to weigh the benefits against the cost and keep your personal budget in mind.

Blue light blocking glasses are glasses that are designed to prevent blue light from reaching your eyes. The concept of blue light blockers is based on the discovery that exposure to blue light suppresses the release of melatonin, the sleep hormone. Blocking blue light is therefore thought to be an easy and inexpensive way to help people sleep after using electronics in the evening. Glasses designed to filter out only the most high-energy blue light may also help reduce eye strain during the day.

Natural blue light emitted by the sun is crucial for regulating your sleep-wake cycle. During the day, exposure to sunlight promotes alertness. At night, darkness stimulates the release of melatonin. Without these natural light cues, your body would have a hard time knowing when to wake up and when to fall asleep.

Due to the ever-increasing availability of artificial light sources such as light bulbs and computer screens, many of us are exposed to light late in the evening. Electronic screens in particular are rich in blue light, meaning they have a similar effect to sunlight. Extensive research has shown that excessive screen time, especially before bed, can disrupt the natural regulation of your sleep-wake cycle.

Blue light blocking glasses are designed to specifically filter out the blue wavelengths of light before they reach your eyes. Most blue light blocking glasses target ultraviolet light with a wavelength of 200 to 400 nanometers (nm), as well as violet light between 400 and 440 nm and blue light up to 500 nm. With less blue light reaching your eyes, your body is free to produce melatonin to help prepare for sleep.

Traditional blue light blocking glasses are orange- or amber-tinted. As blue light is a visible wavelength, filtering out blue light has an effect on the way you perceive colors. Therefore, while orange and amber blue light blockers may be more effective than clear glasses, most people consider them to be less user-friendly, especially for applications that require seeing colors.

Accordingly, some manufacturers market blue light blocking glasses with lenses that are practically clear. These glasses target high-energy violet and blue light between 400 and 450 nm, but they filter out a smaller percentage of blue light overall. They are engineered to offer a balance of blue light blocking and normal visibility.

Emerging evidence suggests that using blue light blocking glasses may successfully prevent bright lights from interfering with your sleep hormones. In these studies, people who wore blue light blocking glasses sleptbetter and didn’t experience the drop in melatonin normally associated with evening light exposure.

Before the advent of electricity, humans slept and woke according to the timing of the sunrise and sunset. Sunlight is composed of a wide range of light wavelengths, including the entire visible spectrum from red to violet as well as ultraviolet (UV) and infrared wavelengths. However, blue light in the range of 446 to 477 nm has the most significant impact on the sleep-wake cycle.

When it comes to natural light from the sun, blue light is very helpful. Exposure to a healthy amount of blue light in the daytime promotes alertness and helps you sleep better at night. However, too much blue light exposure later in the evening makes it harder to fall asleep and may also contribute to poor sleep quality and morning grogginess.

Popular electronic devices such as smartphones, tablets, gaming devices, and televisions emit blue light. Blue light blocking glasses are intended to act as a barrier between you and these artificial blue light sources to prevent your late night screen time from disturbing your sleep.

In addition to wearing blue light blocking glasses, there are many lifestyle changes you can make to reduce your exposure to blue light in the evening. You may also want to consider talking with your eye doctor about bright light exposure and protection at your next eye exam.

One of the most effective ways to reduce blue light exposure and improve your sleep is to avoid using electronics before bed. Ideally, you should try to end screen time at least 1 hour before you go to bed, to give your body time to ramp up melatonin production. Instead of scrolling through social media, consider winding down by reading a book or listening to music.

Fluorescent lights and LED bulbs typically emit more blue light than warmer-toned incandescent light bulbs, though plenty of manufacturers are starting to make LED lightbulbs that emulate the color pattern of incandescent lightbulbs. Consider switching to warmer-toned lightbulbs or installing a dimmer to reduce the brightness of your home lighting as you approach bedtime. Similarly, using a dim red night light during midnight bathroom trips can help provide illumination while limiting your blue light exposure.

If you must use electronic devices at night, consider installing dimming software. Software programs such as f.lux adjust the type of light that your screen emits. Using this software, your screen releases more blue light in the morning to keep you alert but slowly shifts to low-energy red light as you approach your bedtime. Some devices also come with built-in nighttime settings that switch to a black background at night, or automatically decrease the brightness of your screen and shift your display to warmer colors late in the evening.

Another option for those that must use screens at night is a physical blue light filter that can be installed over your screen to block the majority of blue light from reaching your eyes.

Blue light blocking glasses typically range in price from $15 to $50, with an average price of approximately $30. Most blue light blocking glasses don"t require prescription lenses, so they are relatively inexpensive to produce.

While there isn’t a consensus among the medical community, some research demonstrates that blue light blocking glasses may help pave the way for sleep by helping boost melatonin production. Orange-tinted lenses block more blue light than amber-tinted lenses, and amber-tinted lenses block more blue light than clear lenses. Red-tinted lenses block the most light, but they are rarely worn as they make it very difficult to see.While there isn’t a consensus among the medical community, some research demonstrates that blue light blocking glasses may help pave the way for sleep by helping boost melatonin production. Orange-tinted lenses block more blue light than amber-tinted lenses, and amber-tinted lenses block more blue light than clear lenses. Red-tinted lenses block the most light, but they are rarely worn as they make it very difficult to see.

Blue light blocking glasses are sold online and in brick-and-mortar stores, each of which offers certain advantages depending on your needs. By shopping for glasses in pharmacies, drug stores, and eyewear stores, you may be able to ask for advice from the store attendant regarding the best model for you. However, by shopping online, you"ll be able to choose from a much wider selection of brands and models. Online retailers also tend to have more competitive prices, as well as generous return policies in case you"re not satisfied with your purchase.

If the manufacturer can provide you with the transmittance spectrum report for your glasses, then you can see for yourself what percentage of blue light they block. An alternative method is to use an online color test, or devise your own by looking up an image of a rainbow online. A Google image search should bring up many pictures that look like a rainbow of colors blending into one another from red to blue to violet. When observed through a pair of blue light blocking glasses, the blue section should appear darker or even black, depending on the strength of the glasses.Certain blue light blocking glasses come with a so-called blue light laser and ask you to shine the laser through the lens of your glasses to verify that no blue light reaches a white paper held up to the other side. However, most of these lasers actually emit violet light, which is not the light that most affects the sleep-wake cycle.

Blue light blocking glasses are considered just as safe for your eyes as wearing regular sunglasses. The only caveat is that wearing blue light blocking glasses during the day may be counterproductive. While it"s important to reduce your exposure to blue light in the later evening hours, blue light exposure from the sun in the early morning and afternoon helps regulate your internal clock. If you"re looking for a daytime pair of glasses to help reduce eye strain, opt for blue light blocking glasses that are almost transparent, instead of visibly amber- or orange-tinted.

Standard prescription lenses do not block blue light. However, prescription blue light blocking glasses are available, and some manufacturers make blue light blocking glasses that fit over prescription glasses. Ask your optometrist about prescription options for blue light blocking lenses.

Blue light blocking glasses may be a worthwhile option for people who have trouble getting to sleep after too much screen time. With models available at the $20 price-point, blue light blocking glasses are a fairly low-cost and easy-to-use solution for shielding your eyes from blue light and potentially improving your sleep.

Our product experts have extensive experience testing just about every sleep product on the market. Send an email to [email protected] or call us at (877) 672-8966 with your questions and we"ll help you find exactly what you"re looking for.

Since our blog post titled ‘How Effective is your Blue Light Filter - Test Your Glasses with this Graphic’ we’ve received a lot of questions from people curious to learn more. Often times, people have purchased glasses from a source and are not certain if they are truly blue light filtering and if they are – how effective.

So we decided to design another graphic to help our readers test their glasses. But first, we’ll go through a little background on how color is displayed and perceived. The image below illustrates a simple Red Green Blue (RGB) color model that most should be familiar with.

The above image shows an additive color system in which red, green, and blue light are added together in various ways to reproduce a broad array of colors.

Many electronic displays utilize a technology called Liquid Crystal Display (LCD) to create the color images on the screen. To simplify, the screens are composed of many pixel panels. Each pixel has three subpixels which are composed of red, green and blue. Through control of the voltage applied, each pixel can be switched on or off, or have its intensity modulated. This variation produces all the range of colors that you see on a screen.

When light reaches your eye, depending on the wavelength of the light, a specific type of cone – either red, green or blue will fire. The visual cortex within the brain receives the message and forms a mental picture of the image.

If you have normal color perception and your monitor can display RGB, the two images shown above should appear different. The image on the left represents a regular RGB color model. The image on the right was modified to reduce the blue hues using a photo editing software.

Now try looking at the image with your blue light filtering eyewear. If you have true blue light filtering eyewear, both images will appear almost identical with the glasses.

Glass substrate with ITO electrodes. The shapes of these electrodes will determine the shapes that will appear when the LCD is switched ON. Vertical ridges etched on the surface are smooth.

A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers. Liquid crystals do not emit light directlybacklight or reflector to produce images in color or monochrome.seven-segment displays, as in a digital clock, are all good examples of devices with these displays. They use the same basic technology, except that arbitrary images are made from a matrix of small pixels, while other displays have larger elements. LCDs can either be normally on (positive) or off (negative), depending on the polarizer arrangement. For example, a character positive LCD with a backlight will have black lettering on a background that is the color of the backlight, and a character negative LCD will have a black background with the letters being of the same color as the backlight. Optical filters are added to white on blue LCDs to give them their characteristic appearance.

LCDs are used in a wide range of applications, including LCD televisions, computer monitors, instrument panels, aircraft cockpit displays, and indoor and outdoor signage. Small LCD screens are common in LCD projectors and portable consumer devices such as digital cameras, watches, calculators, and mobile telephones, including smartphones. LCD screens have replaced heavy, bulky and less energy-efficient cathode-ray tube (CRT) displays in nearly all applications. The phosphors used in CRTs make them vulnerable to image burn-in when a static image is displayed on a screen for a long time, e.g., the table frame for an airline flight schedule on an indoor sign. LCDs do not have this weakness, but are still susceptible to image persistence.

Each pixel of an LCD typically consists of a layer of molecules aligned between two transparent electrodes, often made of Indium-Tin oxide (ITO) and two polarizing filters (parallel and perpendicular polarizers), the axes of transmission of which are (in most of the cases) perpendicular to each other. Without the liquid crystal between the polarizing filters, light passing through the first filter would be blocked by the second (crossed) polarizer. Before an electric field is applied, the orientation of the liquid-crystal molecules is determined by the alignment at the surfaces of electrodes. In a twisted nematic (TN) device, the surface alignment directions at the two electrodes are perpendicular to each other, and so the molecules arrange themselves in a helical structure, or twist. This induces the rotation of the polarization of the incident light, and the device appears gray. If the applied voltage is large enough, the liquid crystal molecules in the center of the layer are almost completely untwisted and the polarization of the incident light is not rotated as it passes through the liquid crystal layer. This light will then be mainly polarized perpendicular to the second filter, and thus be blocked and the pixel will appear black. By controlling the voltage applied across the liquid crystal layer in each pixel, light can be allowed to pass through in varying amounts thus constituting different levels of gray.

The chemical formula of the liquid crystals used in LCDs may vary. Formulas may be patented.Sharp Corporation. The patent that covered that specific mixture expired.

Most color LCD systems use the same technique, with color filters used to generate red, green, and blue subpixels. The LCD color filters are made with a photolithography process on large glass sheets that are later glued with other glass sheets containing a TFT array, spacers and liquid crystal, creating several color LCDs that are then cut from one another and laminated with polarizer sheets. Red, green, blue and black photoresists (resists) are used. All resists contain a finely ground powdered pigment, with particles being just 40 nanometers across. The black resist is the first to be applied; this will create a black grid (known in the industry as a black matrix) that will separate red, green and blue subpixels from one another, increasing contrast ratios and preventing light from leaking from one subpixel onto other surrounding subpixels.Super-twisted nematic LCD, where the variable twist between tighter-spaced plates causes a varying double refraction birefringence, thus changing the hue.

LCD in a Texas Instruments calculator with top polarizer removed from device and placed on top, such that the top and bottom polarizers are perpendicular. As a result, the colors are inverted.

The optical effect of a TN device in the voltage-on state is far less dependent on variations in the device thickness than that in the voltage-off state. Because of this, TN displays with low information content and no backlighting are usually operated between crossed polarizers such that they appear bright with no voltage (the eye is much more sensitive to variations in the dark state than the bright state). As most of 2010-era LCDs are used in television sets, monitors and smartphones, they have high-resolution matrix arrays of pixels to display arbitrary images using backlighting with a dark background. When no image is displayed, different arrangements are used. For this purpose, TN LCDs are operated between parallel polarizers, whereas IPS LCDs feature crossed polarizers. In many applications IPS LCDs have replaced TN LCDs, particularly in smartphones. Both the liquid crystal material and the alignment layer material contain ionic compounds. If an electric field of one particular polarity is applied for a long period of time, this ionic material is attracted to the surfaces and degrades the device performance. This is avoided either by applying an alternating current or by reversing the polarity of the electric field as the device is addressed (the response of the liquid crystal layer is identical, regardless of the polarity of the applied field).

Displays for a small number of individual digits or fixed symbols (as in digital watches and pocket calculators) can be implemented with independent electrodes for each segment.alphanumeric or variable graphics displays are usually implemented with pixels arranged as a matrix consisting of electrically connected rows on one side of the LC layer and columns on the other side, which makes it possible to address each pixel at the intersections. The general method of matrix addressing consists of sequentially addressing one side of the matrix, for example by selecting the rows one-by-one and applying the picture information on the other side at the columns row-by-row. For details on the various matrix addressing schemes see passive-matrix and active-matrix addressed LCDs.

LCDs are manufactured in cleanrooms borrowing techniques from semiconductor manufacturing and using large sheets of glass whose size has increased over time. Several displays are manufactured at the same time, and then cut from the sheet of glass, also known as the mother glass or LCD glass substrate. The increase in size allows more displays or larger displays to be made, just like with increasing wafer sizes in semiconductor manufacturing. The glass sizes are as follows:

Until Gen 8, manufacturers would not agree on a single mother glass size and as a result, different manufacturers would use slightly different glass sizes for the same generation. Some manufacturers have adopted Gen 8.6 mother glass sheets which are only slightly larger than Gen 8.5, allowing for more 50 and 58 inch LCDs to be made per mother glass, specially 58 inch LCDs, in which case 6 can be produced on a Gen 8.6 mother glass vs only 3 on a Gen 8.5 mother glass, significantly reducing waste.AGC Inc., Corning Inc., and Nippon Electric Glass.

In 1922, Georges Friedel described the structure and properties of liquid crystals and classified them in three types (nematics, smectics and cholesterics). In 1927, Vsevolod Frederiks devised the electrically switched light valve, called the Fréedericksz transition, the essential effect of all LCD technology. In 1936, the Marconi Wireless Telegraph company patented the first practical application of the technology, "The Liquid Crystal Light Valve". In 1962, the first major English language publication Molecular Structure and Properties of Liquid Crystals was published by Dr. George W. Gray.RCA found that liquid crystals had some interesting electro-optic characteristics and he realized an electro-optical effect by generating stripe-patterns in a thin layer of liquid crystal material by the application of a voltage. This effect is based on an electro-hydrodynamic instability forming what are now called "Williams domains" inside the liquid crystal.

In the late 1960s, pioneering work on liquid crystals was undertaken by the UK"s Royal Radar Establishment at Malvern, England. The team at RRE supported ongoing work by George William Gray and his team at the University of Hull who ultimately discovered the cyanobiphenyl liquid crystals, which had correct stability and temperature properties for application in LCDs.

The idea of a TFT-based liquid-crystal display (LCD) was conceived by Bernard Lechner of RCA Laboratories in 1968.dynamic scattering mode (DSM) LCD that used s