how to build a lcd screen for sale

2023-01-03 12:32:11

If you have ever wondered what it took to make your own custom graphic LCD from scratch, this video from [Applied Science] is worth a watch. It’s concise and to the point, while still telling you what you need to know should you be interested in rolling your own. There is also a related video which goes into much more detail about experimenting with LCD technology.

[Applied Science] used microscope slides and parts purchased online to make an LCD that displays a custom graphic when activated. The only step that home experimenters might have trouble following is coating the glass slides with a clear conductive layer, which in the video is done via a process called sputtering to deposit a thin film. You don’t need to do this yourself, though. Pre-coated glass is readily available online. (Search for Indium-Tin Oxide or ‘ITO’ coated glass.)

The LCD consists of a layer of liquid crystal suspended between two layers of conductive glass. An electrical field is used to change the orientation of crystals in the suspension, which modulate the light passing through them. Polarizing filters result in a sharp contrast and therefore a visible image. To show a particular shape, some of the conductive coating is removed from one of the layers in the shape of the desired image. The process [Applied Science] uses to do this is nearly identical to etching a custom PCB.

Parts of LCD technology can be quite hackable. Neither of these videos are brand-new, either. Have any of you taken on the challenge of DIY LCD displays? We’ve seen experiments with electrochromatic glass using old LCD displays, as well as experiments in playing with polarized light to hide secret messages on LCD screens.

how to build a lcd screen for sale

Since 1990, AccuView is dedicated to delivering fully customized LCD display solutions for our customers. Our strength lies in understanding and meeting our customers" EXACT requirements coupled with AccuView"s comprehensive manufacturing capabilities and expertise to deliver the right LCD display solution. Let AccuView be your total video solution provider.

how to build a lcd screen for sale

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how to build a lcd screen for sale

If you are a fan of building or prototyping your own electronics, you already know how hard it can be to find the exact type of components you need. Your builds can really benefit from more advanced components, including LCD displays. If you are an Arduino user, there are many Arduino LCD displays, repurposed LCD screens that are compatible, and shields to add the display output to your creations. The LCD display modules you find from the trusted sellers on eBay come in many different sizes, starting with screens that shows 2 rows of 16 characters, 4 rows of 20 characters, and low resolution graphical displays with dimensions of 240 by 128 or 128 by 64. If you need to replace screens for your devices, such as Android tablets, you can also find digitizer 7-inch LCD displays for your model. These LCD displays can be found from the list of sellers, many of whom offer convenient shipping options, so you can get your screens at a time that is good for you.

how to build a lcd screen for sale

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how to build a lcd screen for sale

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how to build a lcd screen for sale

Mimo Monitors can create a custom-size LCD monitor to almost any specification. Whether it is a minor modification to an existing design, or by utilizing our extensive experience in the industry, we can almost always build what you need.

What we are going to deliver is an industrial open frame monitor, in other words a “bare bones” display sans housing or bezel. These types of displays are meant for integration into kiosks, equipment, or other enclosures. The major advantage to an open frame monitor is that the external design will not change for some time. Therefore, the enclosure it is built into will not need to change for many years.

Size –Measured in inches diagonally from corner to corner – Typical sizes are 7, 10.1, 13.3, 15.6, 18.5, 21.5. We can go bigger than this if necessary. Almost any size is possible.

Aspect ratio - The ratio of the width of the display to the height. Current televisions are 16:9, Old televisions are 4:3 – 16:9, 16:10 and 4:3 are the most popular. Every other aspect ratio is less popular, but any aspect ratio can be created by resizing a panel.

Resolution - The number of pixels in the display – This will depend somewhat on the aspect ratio chosen. Higher resolution is better, but remember the pixel size on a 65” 1080p HDTV is actually 15x worse than on a 800x480 7” display. In other words, resolution doesn’t matter as much as sizes get smaller. Common resolutions are 800x480, 1024x600, 1280x800, 1366x768 1920x1080

Viewing Angle - This will depend on the technology of the LCD panel. TN vs. VA vs. IPS. More here (http://www.tnpanel.com/tn-vs-ips-va/) . In general, the better the viewing angle, the more expensive the resulting display. Typical are 150x140, 170x170 and 179x179. Or more commonly wide viewing angle or standard viewing angle.

Brightness or Luminance - It is the level of light emitted by an LCD display monitor. Luminance is reported in nits or cd/m2. They are actually the same thing. This matters for indoor and outdoor viewing and also if you want to draw people toward the display for advertising. Typical indoor brightness is 150 nits, indoor advertising is 300, bright indoor advertising is 700 and outdoor panels are 1000+

Interface to computer - How the video and optionally touch information is transmitted. Typical options are DVI (digital video), VGA (analog video), HDMI (digital video with audio), DisplayPort (newest digital format) and DisplayLink. Touch is almost exclusively USB at this time. This chooses the number of cables in the solution

Single Cable –DisplayLink has an advantage that video information, touch information, and power are transmitted over a single USB connection. Read 5 Reasons to Choose a USB Powered Monitor to learn how they can meet your needs.

Touch panel - Optional human interface for interactivity. Typical choices are Display Only, Resistive (4 or 5 wire), and Capacitive touch options. Our blog discusses the advantages and disadvantages of capacitive touchscreens. SAW is another touch technology that is becoming less and less common.

how to build a lcd screen for sale

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how to build a lcd screen for sale

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how to build a lcd screen for sale

YaeCCC 7" LCD Touch Screen Vacuum Separator Cellphone Repair Machine is an easy-to-use touch screen separating machine, allowing you to easily separate glass from LCD.

In this way, you can save a bunch of money by simply replacing the broken glass if the touch screen panel still functions well. High quality aluminum alloy heating plate features fast heating, high efficiency, even heat distribution and convenient temperature control.

4. Start to push the mould gently and slowly until the LCD automatically separated from the glass.(If the glass is totally broken, please stick a tape on the surface of the glass to make it easy to separate and avoid it hurt the LCD) , generally just one time you can take the glass off ;

how to build a lcd screen for sale

As the most common display equipment in our daily life, the monitor has been closely related to our work and entertainment. For consumers now, the highest level of attention or 1000 yuan display, but now the display market products and brands are numerous, a lot of products in the name of low-price display banner, but in fact, the quality of display products is not up to standard.

When choosing a monitor, we tend to pay too much attention to the parameters of the screen, the understanding of the internal structure of the monitor can be said to know nothing. For many monitor users, it is rare to have the opportunity to disassemble the monitor. Compared with computers, notebooks, and other products, the internal structure of the monitor appears more mysterious.

In fact, the use of material and do manual work inside the monitor display performance and service life have a direct impact, so today through the means of dismantling to everyone see those so-called cheap hot display “inner core” what kind of after all?

Because now the heat of the e-sports display is very high, many do not have the performance and parameters of the display e-sports and low double banner to deceive consumers, improve sales, so the author also wants to remind the majority of consumers in the purchase to pay more attention to these points, to avoid being cheated.

First of all, the first step is to remove the frame of the display. Here we need to say that many people do not easily remove the display by themselves, because the frame of many displays is better sealed. In the process of dismantling, it is easy to damage the buckle and cause irreversible damage.

When we opened the back cover, we found that the inside of the display was very shabby. A large area of space was empty, and a small, infinitesimal PCB was placed under it. Is this what we have always wanted to see inside the display?

Below is a picture of the inside of the Samsung display that we have dismantled before. By comparison, we can clearly see the difference in the workmanship and materials used between the two. The jail-cutting phenomenon in the picture above is very obvious.

After looking at the internal structure, let’s take a look at the gap between the main control circuit board. A cheap display IC circuit board design is very simple, many components are fixed with hot melt glue, and the solder joints on the circuit board are very rough poor womanliness. Compared with the Samsung display molding, components arranged neatly for the circuit board, such workmanship is indeed very pit, simply can not guarantee the service life of the display.

The image below shows the monitor. I had worked in a computer company for many years the computer test, this belongs to the screen light-leaking before assembly will be selected, it belongs to the unqualified products, but the company also spent money, after all, so will use all the products selected defective assembling, made “machine” sales promotion, the price of the advantage of this machine is very low, often 100 yuan, the Sale price is likely to be 10 yuan, after the department of the “repair”, is not hard to find professional and technical personnel, such as poor deformation, the distance between the two parts, different color, light-leaking, screen impurities, scratches (by coating treatment is generally not easy to find, after a long time away you’ll think is their careless); Laptops, for example, are particularly concerned about appearance and can use alcohol to wipe the case.

Then I checked the Internet for information about the panel used on these cheapest monitors. Searches the major panel inquiry website, can not find the detailed information of this panel, it can be seen that this panel is not produced by the mainstream panel manufacturers, the quality is suspicious. And the information on the label is very simple and provides very little information.

After looking at the above series of data, we can also know the quality of this panel. Through the data, we can determine that this panel is produced by an unknown small OEM, and the quality cannot be guaranteed at all. From the materials used to build the interior to the panel selection, it’s easy to see what’s still profitable behind its low price LCD. Through the actual dismantling, the method revealed the cheap LCD screen jerry-building, quality control is not a good phenomenon. Through this dismantling comparison, we also see the gap between the brand manufacturer’s monitor and the unknown manufacturer’s monitor in the work and the material, and those unknown brands of the bottom screen have no actual after-sales service, once the product is bought out of the problem, the final is cheated by the consumer. So in also want to remind the majority of consumers in the purchase of display to consider, do not because of cheap LCD screen price and bring more trouble to their own.

how to build a lcd screen for sale

Liquid Crystal Displays or more commonly known as LCDs are one of the most common electronic components which help us interact with an equipment or a device. Most personal portable equipment and even gigantic industrial equipment utilize a custom segment display to display data. For many portable consumer electronics, a segment LCD display is one of the biggest contributors to the overall cost of the device, hence designing a custom segment display can drive the cost down while also utilizing the display area in the most optimum manner. These displays have the lowest cost per piece, low power requirements, and a low tooling fee too.

At first thought, designing a custom segment LCD might look like a Herculean task, but trust me that it is easier than it seems. In this article, we have summarised and compared the display types and available technologies which are required to construct a custom segment LCD. We have also provided a flowchart that can act as a step-by-step guide while you design your own custom LCD. We have also provided the process we followed, a require gathering sheet we used for communicating our needs to the manufacturer, and a few other data and the quotation we received from the manufacturer.

Icons: A silhouette of any shape can be placed on the glass which enhances the ability to display data. For example, a symbol of a heart can be made to denote heart rate or an icon for a low battery to show that the battery needs to be charged. Icons are counted as a single pixel or segment and can give a lot more details than similar-sized text.

LCD Bias– It denotes the number of different voltage levels used in driving the segments, static drives (explained later in this article) only have 2 voltage levels or 2 bias voltage while multiplex drives have multiple voltage levels. For example, 1/3 will have 4 bias voltages.

LCDs utilizes the light modulating properties of liquid crystals which can be observed by using polarizing filters. Polarizing filters are special materials that have their molecules aligned in the same direction. If the light waves passing through polarisers have the same orientation as the filter, then the molecules of lights are absorbed by the filter, hence reducing the intensity of light passing through it, making it visible.

In Layman’s language, when an electric current is applied to the electrodes, i.e. to the segment line and common line, it twists the Liquid Crystals w.r.t to the polarizing filter, obstructing the light in that particular area as shown in the figure below. Hence, that area becomes darker and prominent.

A custom LCD is important for maximizing the efficiency of the display area by adding custom symbols and characters. It also helps in reducing the cost and improving energy efficiency of the product. A higher number of custom symbols and specified placement of numerical and alphanumerical characters make the display more informative and readable for the user. This makes it look better than the plain old boring displays we get in the market. Furthermore, we can specify the viewing angle, contrast, and other specifications which can increase durability or give a better value for money for our intended usage. A typical Custom Segment display is shown below, we will also show you how to design and fabricate the same further in the article.

The LCD display doesn’t emit any light of its own, therefore it requires an external source of illumination or reflector to be readable in dark environments.

While designing a custom segment LCD display, we have the leverage of choosing a lot of parameters that affect the final product. From the color of the display to the illumination technique and color of illumination as well as the type of input pins. Some important considerations we need to take while designing a custom 7 segment display are - the type of display, i.e. positive or negative, illumination method, driving technique, polarising type, and connection method. All these design criteria are explained below:

Positive and negative displays can be easily distinguished by the colour of the background and characters. Some common differences between the positive and negative displays are:

So, which one should you choose? When the displays are to be used in areas with higher ambient light, we should select positive segment LCD display as it has better visibility than negative segment LCD displays without using a backlight.

As we know that LED displays don’t emit any light, hence to illuminate it and make it visible in a dark environment, we can use different methods of illumination. The most common LCD Illumination methods are compared below:

For displays that need to be used for budget-friendly devices that should be small and rugged, LED lights are preferred for the displays due to the high durability and low cost of operations. For high brightness, CCFL and Incandescent lights can be used.

A polarizer film is the most important component of an LCD display, which makes it possible to display characters by controlling the light. There are 3 types of polarizers that can be used in the LCD display, the properties and difference are given below:

If your products need to be used with a switchable backlight, then trans-reflective reflectors are best to be used for front reflectors. If the device has to be used without backlight, then we can select a reflective polarizer for the back-panel as it gives the best contrast ratio.

Displays can be categorized into two types, passive displays, and active display, passive displays are simpler to construct as they have 2 connections at each segment, the conductors comprise of an Indium Tin Oxide to create an image, whereas the active displays use thin-film transistors (TFT) arranged in a grid. The name is due to its ability to control each pixel individually.

If your displays have fewer segments, then static LCD drive is preferred as it is easier to control and cheaper to construct, and has a better contrast ratio. But let’s say that if the number of segments in the display are more than 30-40 then a multiplex LCD drive should be preferred as it has multiple common pins, hence reducing the total number of pins required to drive the display.

Choosing a connector type!!! For the prototyping phase or if you need to connect your LCD display on a Microcontroller directly, a pin type connector is the best and most economical option you have. If you need to connect your LCD display in a final product with a high volume of production which also requires to be extremely durable, but at the same time should not take up a lot of space, a Flex type LCD Connector will work best for you

LCDs have limited viewing angles and when seen from an angle they lose contrast and are difficult to be observed. The viewing angle is defined by the angles perpendicular to the center of the display towards its right, left, up, and down which are denoted by the notations 3:00, 9:00, 12:00, and 6:00 respectively. The viewing angle of LCD can be defined as the angle w.r.t. to the bias angle at which the contrast of segments is legible.

To improve the viewing angle in an LCD, a Bias is incorporated in the design which shifts the nominal viewing angle with an offset. Another technique is to increase the Voltage, it affects the bias angle, making the display crisper when viewed from a direction.

For example, the viewing angle of a TN type TFT LCD is 45-65 degrees. Extra-wide polarising film (EWP) can increase the viewing angle by 10 degrees, using an O film polariser can make the viewing angles 75 degrees but these come at a cost of reduced contrast.

Anti-glare filters are bonded with the top polarising filters using adhesive. It improves the viewability by re-directing light waves so they don’t reflect back towards the viewer thus reducing glare. Newer materials are capable of reducing the front glare by up to less than 0.3%.

LCD Control chip or LCD driver chips can be mounted on the flex cable, display, or externally on a PCB. The placement of LCD control chip can affect the cost and size of the display. The 2 most common methods of chip placement are-Chip of Board (COB)and Chip on Glass(COG) which are described below:

COG can be used as it is cheaper and makes the assembly process simpler, but if the dimensions are a constraint, then the COB is also a viable option.

We planned to design an air quality monitoring system for which we needed a custom segment LCD panel for an air quality monitoring device. Our product needs to display the following data: 2.5-micron and 10-micron particulate matter (PM) suspended in the air; the units should be in parts per million (PPM). CO2 in the air in PPM along with total volatile organic compounds present in the air in parts per billion (PPB). To make the product more usable, we included time in 24-hour format, Temperature in ºC, Battery status, loudspeaker status, Bluetooth status, and Wi-Fi status. And for some personal touch, we also added how good the air quality in the room is by using 3 different smileys.

We realized that it was impossible to provide all these data in a generic LCD available in the market, thus decided to build a custom LCD for our project.

A step-by-step flowchart is shown below to walk you through each and every step of selecting components and getting your custom segment LCD manufactured.

We started by listing down our requirements and drew a mock-up of the display on paper. After finalizing the placement of all the segments and icons on the prototype sketch of the display, we then decided which all icons and segments have to be kept on for the whole time and which needs to be driven. Realizing that there are too many segments, characters and icons, hence we selected a multiplex drive with 8 common pins which helped us bring down the total pins from an estimated 180 pins to less than 40 pins.

Since the device was meant to be used inside houses and offices, which are more often than not well lit and protected from environmental conditions, we opted for a positive mode display. For superior contrast ratio and better viewing angle, we chose a Film Super Twisted Nematic Display (FSTN) with a drive condition of 1/8 Duty and bias of 1/4.

Usually, the displays are mounted at a height of 4.5 feet from the ground, thus the viewing direction was selected to be 12"O clock with an operating frequency of 64Hz. We selected a Transmissive polarizer for the front glass and a reflective polarizer for the rear glass so that the natural light can pass through the front panel and the display can achieve the maximum contrast without the need for backlighting and we opted for the pin type connectors as they are easy for prototyping and are suitable for harsh environment with a lot of vibrations and shocks which best suited our purpose.

In the above image of a custom display design, we sent to the manufacturer, the red lines over multiple characters indicate that all these are considered as a single segment. For the sake of simplicity, we added test like T, S, U, B to denote Text, Symbols, Units, and Battery respectively. These characters were followed by numbers to simplify communication between us and the manufacturer. For example, if we needed any particular text or symbol to remain on, we can easily specify that to the manufacturer by using the corresponding text for that segment.

We mailed our requirements to multiple LCD manufacturers, (you will find a lot of LCD manufacturers on the Internet). Most LCD manufacturers have competitive pricing, and reply within a week. A sample requirement sheet is shown above which a customer needs to fill to specify all the details to the manufacturer.

This is a sample Custom Segment LCD quotation we got from one of the manufacturers. As you can see, the cost is based on the quantity. Higher the quantity, lower the cost. Apart from the cost per quantity, there is one more component called tooling fees. Tooling fee is a one-time fee charged by the manufacturer. It is for the technical design, support, and customization of the product. Customization of PCB or tooling of LCD can drive the tooling price higher or lower.

The tooling time and cost depend on how detailed and accurate designs you sent to the manufacturer. They then send the exact dimensions and technical details of the product they will be manufacturing. Once you confirm the design, they manufacture and ship the product which might take 4-8 weeks to arrive depending on the size of the order and mode of transportation selected.

A custom segment LCD can help you personalize your product while also saving the overall cost of your product. The whole process will take you around 2-3 months, which will include the designing phase, prototyping phase, and getting your custom segment LCDs delivered to your doorstep. Higher ordering quantity will reduce the cost per piece of each unit, thus driving down the cost of your final product.

how to build a lcd screen for sale

The transparent display we offer for sale (CFAL12856A0-0151) is an OLED (Organic Light Emitting Diode) display. OLED displays produce images by emitting light in the corresponding color. To produce black in a normal OLED, the pixels are simply turned off. With the transparent display, if the pixels are turned off, the display is transparent rather than black.

We’ve heard from a few customers requests for transparent displays with black graphics as well as requests for larger transparent displays. This guide will walk you through creating a transparent display out of a graphic LCD.

A few caveats before we get much farther. First, doing this will definitely void your warranty on the display. Second, the display we’ll create is significantly less transparent than a transparent OLED displayas you can see in the above image with the hacked transparent display on the left and the transparent OLED on the right.

Using the x-acto knife, get between the back polarizer and the display and pull the transflective polarizer off of the display. Unlike our pictured engineer, you should wear some hand protection to keep your fingers safe.

Rotate the display relative to the polarizer until you find the optimal transparency. This is why it’s important to use a larger polarizer so the polarizer can accommodate the display at any angle.

If you harvested a polarizer from an existing display it already has adhesive on it and you can simply carefully adhere it to the display. Take care while applying the polarizer or bubbles will form between the display and the polarizer.

When cutting the polarizer near the tail, be aware that there are traces connecting the tail to the display and cutting these traces will ruin your display.

If you have any questions, we can be reached at support@crystalfontz.com, we also provide chat and telephone support Monday through Friday during our open hours.

We love to hear about your projects! Find us around the web (YouTube, Facebook, Instagram, LinkedIn, Twitter, Forum) and let us know what you’re working on.

how to build a lcd screen for sale

how to build a lcd screen for sale

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