adding brightness control for cheap tft lcd manufacturer

I bought a cheap ($12) 3.5 inch LCD screen from ebay and it worked fine with the waveshare35a and the builtin piscreen overlays - including touch events. But one thing I could not do was control brightness.

The fix was easy and required only 2 components - 2N4401 (or any other comparable NPN transistor) and a 10k resistor. But the tricky part was removing the connection from 3.3v to common anode of backlight. I used a hobby knife to remove the trace which is under the board - right where C1 meets 3.3V. Will add a picture next time I open up the LCD module.

See attached pic for details of the circuit. 3.3V (pin 2) from AMS1117 is connected to Collector (pin 3) of 2N4401 - red wire. PWM pin/GPIO18 from header (pin 12) is connected to base (pin 2) of 2N4401 via 10k resistor - yellow wire. Emitter (pin 1) of 2N4401 is connected to the common anode of backlight at C1 - white wire. You can access pin 12 from header under the board - but I chose to drill the header.

Engineers are always looking for lower cost, faster, more convenient interfaces to transmit signals and to accept data and commands. The numbers of available interfaces available in the market can be dazzling. Orient Display can also convert any interfaces to the customer’s requirements among the above interfaces or to higher level interfaces.

Genetic (Raw) Interfaces: Those are the interfaces which display or touch controller manufacturers provide, including 6800,8080, SPI(,Serial Peripheral Interface), I2C, RGB (Red Green Blue), MIPI (Mobile Industry Processor Interface), LVDS (Low-Voltage Differential Signaling), eDP ( Embedded DisplayPort) etc. Orient Display has technologies to make the above interface exchangeable.

High Level Interfaces: Orient Display has technologies to make more advanced interfaces which are more convenient to non-display engineers, such as RS232, RS485, USB, VGA, HDMI etc. They are widely accepted in the market. More information can be found on our other product pages. TFT modules, Arduino TFT display, Raspberry Pi TFT display, Control Board.

Orient Display sunlight readable TFT displays can be categorized into high brightness TFT displays,high contrast IPS displays, transflective TFT displays, Blanview TFT displays etc.

The brightness of our standard high brightness TFT displays can be from 700 to 1000 nits which make them be visible under all environments including direct sunlight. With proper adding 3M brightness enhancement film (BEF) and double brightness enhancement film (DBEF) and adjustment of the LED chips, Orient Display high brightness TFT products can achieve 1,500 to 2,000 nits or even higher luminance which makes great contrast under direct sunlight. Orient Display has a special thermal management design to reduce the heat release and largely extend LED lifetime and reduce energy consumption.

Our high contrast and wide viewing angle IPS displays can achieve contrast ratio higher than 1000:1 which can make readability under strong sunlight with lower backlight luminance. High brightness IPS displays have been widely accepted by our customers with its superb display quality and it has become one of the best sellers in all our display category.

Transflective display is an old monochrome display technology but it has been utilized in our color TFT line for sunlight readable application. Orient Display has 2.4” and 3.5” to choose from.

Blanview TFT displays are the new technology developed by Ortustech in Japan. It can provide around 40% of energy consumption for TFT panels which can use smaller rechargeable or disposable batteries and generate less heat. The price is also lower than traditional transflective TFT displays. Orient Display is partnering with the technology inventor to provide 4.3” and 5.0” .

Orient Display can also provide fullcustomized or part customized solutions for our customers to enhance the viewing experience. Orient Display can provide all the different kinds of surface treatments, such as AR (Anti-reflection); AG (Anti-glare), AF (Anti-finger print or Anti-smudge); AS (Anti-smashing); AM (Anti-microbial) etc. Orient Display can also provide both dry bonding (OCA, Optical Clear Adhesive), or wet bonding (OCR, Optical Clear Resin and OCG, Optical Clear Glue) to get rid of light reflective in air bonding products to make the products much more readable under sunlight and be more robust.

Touch panels have been a much better human machine interface which become widely popular. Orient Display has been investing heavy for capacitive touch screen sensor manufacturing capacity. Now, Orient Display factory is No.1 in the world for automotive capacitive touch screen which took around 18% market share in the world automotive market.

Based on the above three types of touch panel technology, Orient Display can also add different kinds of features like different material glove touch, water environment touch, salt water environment touch, hover touch, 3D (force) touch, haptic touch etc. Orient Display can also provide from very low cost fixed area button touch, single (one) finger touch, double finger (one finger+ one gesture) touch, 5 finger touch, 10 points touch or even 16 points touch

When display devices are brought outside, oftentimes they face the brightness of sunlight or any other form of high ambient light sources reflecting off of and overwhelming the LED backlight’s image.

With the growth of the LCD panel industry as a whole, it has become more important than ever to prevent the sun’s wash out of displays used outdoors, such as automobile displays, digital signage, and public kiosks. Hence, the sunlight readable display was invented.

One solution would be to increase the luminance of the TFT LCD monitor’s LED backlight to overpower the bright sunlight and eliminate glare. On average, TFT LCD screens have a brightness of about 250 to 450 Nits, but when this is increased to about 800 to 1000 (1000 is the most common) Nits, the device becomes a high bright LCDand a sunlight readable display.

Doing this is an affordable option for enhancement of image quality in the outdoors, including features like contrast ratio and viewing angle, in a common use setting like with phones.

Since many of today’s TFT LCD display devices have shifted to touchscreens, the touch panels on the surface of LCD screens already block a small percentage of backlighting, decreasing the surface brightness and making it so that the sunlight can even more easily wash out the display. Resistive touch panels use two transparent layers above the glass substrate, but the transparent layers can still block up to 5% of the light.

In order to optimize the high brightness of the backlight, a different type of touchscreen can be used: the capacitive touchscreen. Though it is more expensive than the resistive touch screen, this technology is more ideal for sunlight readable displays than the resistive due to its usage of a thinner film or even in-cell technologies rather than two layers above the glass of the display, and therefore, light can pass more efficiently.

However, with this method comes a list of potential problems. Firstly, high brightness displays result in much greater power consumption and shorter battery life. In order to shed more light, more power will be needed which can also consequently result in device overheating which can also shorten battery life. If the backlight’s power is increased, the LED’s half-life may also be reduced.

While in bright exterior light settings, these devices reduce eye strain as the user attempts to view the image on screen, the brightness of the display itself can also cause eye strain, seen as the brightness may overwhelm your eyes. Many devices allow the user to adjust brightness, so this concern is oftentimes not too severe.

A recent technology falling into the sunlight readable display category is the transflective TFT LCD, coming from a combination of the word transmissive and reflective. By using a transflective polarizer, a significant percentage of sunlight is reflected away from the screen to aid in the reduction of wash out. This optical layer is known as the transflector.

In transflective TFT LCDs, sunlight can reflect off the display but can also pass through the TFT cell layer and be reflected back out off a somewhat transparent rear reflector in front of the backlight, illuminating the display without as much demand and power usage from the transmissive nature of the backlight. This addresses both the issues of wash out and the disadvantages of high brightness TFT LCDs in high ambient light environments. Because of its transmissive and reflective modes, this type of device is very useful for devices that will be used outdoors but also indoors.

While it does greatly reduce power consumption, transflective LCDs are much more expensive than high brightness LCDs. In recent years, the cost has decreased, but transflective LCDs continue to be more costly.

In addition to adjustments to the internal mechanics of LCDs, it is possible to make devices more sunlight-readable using surface treatments. The most common are anti-reflective (A/R) films/coatings and anti-glare processing.

Often paired with other methods of creating sunlight readable displays is optical bonding. By gluing the glass of a display to the TFT LCD cells beneath it, optical bonding eliminates the air gap that traditional LCD displays have in them using an optical grade adhesive.

This adhesive reduces the amount of reflection between the glass and LCD cell as well as the reflection of external ambient light. Doing this helps provide a clearer image with an increased contrast ratio, or the difference in the light intensity of the brightest white pixel color and darkest black pixel color.

With this contrast ratio improvement, optical bonding addresses the root issue with unreadable outdoor displays: the contrast. Though an increase in brightness can improve contrast, by fixing the contrast itself, LCD display images in outdoor environments will not be as washed out and will require less power consumption.

The optical bonding adhesive’s elimination of the air gap also protects the LCD from moisture/fogging and dust, as there is no space for impurities to penetrate and remain under the glass layer. This especially helps with maintaining the state of LCDs in transport, storage, and humid environments.

Compiling the various methods of improving LCD screens for sunlight readability, these devices can be optimized in high ambient light settings. An anti-glare coating is applied to the surface of the glass and anti-reflective coatings are applied to both the front and back. The transflector is also used in front of the backlight. These features can result in 1000 Nit or more display lighting, without the excessive power consumption and heat production through a high brightness backlight, consequently allowing for a longer lasting and better performing LCD

Unfortunately, the process of building a reflector inside TFT LCD is complicated and transflective TFT LCD is normally several times higher cost compared with normal transmissive TFT LCD.

To further improve and enhance the qualities of the LCD, LED and cold cathode fluorescent lamp (CCFL) backlights are used. Both these create bright displays, but the LED specifically can do so without as much power consumption and heat generation as compared to the CCFL option. Optical bonding is also applied in order to improve display contrast, leading to a more efficient and better quality sunlight readable display.

For the video display developer LCD panels are available in many sizes and resolutions, they are also available with many choices of maximum brightness. The following considers the topic of LCD panel brightness, the choices, the methods for adjusting brightness and some brightness adjustment scenarios.

LCD panels are generally rated as to their maximum brightness level which is expressed in Nits, it is equal to Candela/sqm (cd/m2), and this will be at a particular color temperature as noted in the specification, usually 10,000 K. In terms of a practical understanding, the following is a rough guide:

Outdoor displays range from a low end of 700 nits to typically 1,000 or 1,500nits and up with 2,000~2,500nits and even up to 5,000nits seen with some models. This may include standard LCD panels, custom LCD panels as well as custom cut LCD panels.

Virtually all LCD panels have a LED backlight these days, these are powered by an LED driver board. Brightness control via the driver board will be by one of two methods:

PWM (Pulse Width Modulation): This varies the duty cycle of the backlight “on time” – it is predominant in modern LCD panel LED backlight designs to enable support for digital brightness controls.

Analog: Uses a simple variable voltage to adjust brightness, for example this might be a dial or slider type potentiometer / variable resistor. To see how to enable analog backlight adjustment visit: https://www.digitalview.com/blog/brightness-adjustment/

One of the advantages of LED for the backlight is the range of adjustment that is possible, however it is important to note that the range varies significantly from model to model. Some industrial panels can be turned to very low light levels making them suitable for use in special environments such as at night. Lower cost panels limit the range of brightness to what might be required for typical usage, whereas panels with full range dimming from full off to full on require more complex backlight drivers.

Backlight lifetime: Many LCD panels have a backlight lifetime rating of 50,000 hours (typically measured to half brightness), this can be extended by running the LED backlight at a lower brightness level. Some panels may only offer 30,000 hours as a lower cost solution while other panels may offer up to 100,000 hours for high end applications.

An LCD panel backlight may be constructed so the LED’s are mounted directly behind a light guide diffuser, or they may be mounted along one or more edges of the light guide.

Active backlight: This is a function of some LCD panel backlights to automatically adjust the backlight brightness in response to the image. For more advanced systems there is an LED array making up the LED backlight, this adjusts the brightness in areas localized to the image being shown. This can greatly enhance the brightness across the display and is being used primarily with video, for example on consumer TV sets. It is not useful to all image types, for example a spreadsheet or content like maps or data is not likely to benefit.

Local dimming: Some LCD panels with direct LED may support local dimming so the LED’s are dimmed in response to the image close to them. This will not be at the same resolution as the LCD panel itself but will help greater contrast over the display by enhancing the brightness in bright areas of the image and darkening the image in dark parts of the image.

Both of the above techniques are likely to be more beneficial to certain types of content than others. For example a movie is likely to benefit more than a spreadsheet.

For the LCD monitor manufacturer it is important to consider that any covering over the LCD panel will reduce the brightness. For example the protective glass over a digital signage display, or a touch screen, or a semi-silvered mirror. So if a specific brightness is required the measurement should be taken with these in place.

There are various relatively low cost brightness meters available, typically in the couple of hundred dollars range. It is difficult to comment on the accuracy of these but we have found them to be within 5% of each other, though more importantly they do appear to be quite consistent in measurement so good for measurement comparisons. For more accurate measurement there are light meters from companies such as Minolta that can be calibrated, the cost may run into several thousand dollars.

Examples of light meters costing a few hundred dollars include SpyderX by Datacolor (needs a PC), a handheld meter is the SM208 by Sanpometer (search SM208 meter). Note: Many light meters, including smartphone apps, will be meters used for photography and not give readings in nits (or candelas). LCD panel specifications are typically measured using nits.

PWM and Analog: Most Digital View LCD controllers support PWM and Analog as a method for adjusting the backlight brightness level (this is noted in the column headed “Other” on the controller board summary table: https://www.digitalview.com/controllers/lcd-controllers-home.html. Also see https://www.digitalview.com/blog/brightness-adjustment/ for a guide to using a dial or slider type variable resistor to adjust the backlight.

Ambient light sensor: The backlight is adjusted for brightness or powered off depending on ambient light conditions. This uses a light sensor attached to the LCD controller board, see https://www.digitalview.com/blog/light-sensor-app-note/ for more details.

The specifics of the backlight control are documented separately for each LCD controller model (product summary here) in the product manual available for download on the product page.

Note: There are two ways to adjust the perceived brightness of a LCD panel or LCD monitor, the backlight and the black-level. Very often, particularly in the past, the monitor brightness setting adjusted the black-level, this adjusts the LCD but not the backlight.

Color, color temperature etc: In addition to adjusting the brightness other settings may be adjusted as well. For example the color temperature or for example a switch to green monochrome for night vision.

Auto-dim if lights dimmed for a projector. This might be triggered by a command from a room sensor or automatically by an ambient light sensor (Autobrite+).

Night-safe lighting (update) : Dual-rail backlights can also be supported. These special backlight enable normal brightness and extreme low level brightness with custom night-safe lighting. Contact us for details.

Note: We have a blog on methods for implementing an ambient light sensor with Digital View LCD controller boards to automatically adjust the backlight or system power, see: Ambient Light Sensor

Update March 2019: Most of the above remains unchanged except for the increased availability of high bright LCD panels of around the 1,000 nit to 2,500 nit range. AUO for example has a number of large size LCD panels with 1,500 nit brightness for the digital signage market. Tianma has panels under 20″ with 1,000 nit to 1,500 nit brightness for various outdoor applications.

The other change is that high bright panels are now increasing edge-lit, this makes the panels thinner and these panels tend to use less power than the previous models. One of the benefits for monitor designers is easier heat management and reduced overall display system costs.

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Pacer offers an extensive range of colour TFT LCD panels from 1.8″ through the popular 3.5″ and 5.7″ sizes to 82″. Our range includes sunlight readable panels from 5.6″ to 70″, bar cut panels, and SMART TFT displays with built-in control. We offer TFT displays with high brightness, high contrast ratio, wide viewing angle, wide temperature operation, longer lamp life, and lower power consumption.

TFT displays are used extensively in many industrial, commercial and scientific applications, including ATMs, POS terminals, kiosks, security systems, lottery and gambling gaming machines, medical equipment, factory automation, digital advertisement signage, transportation information, and marine equipment.

TFT technology is being used to replace Mono LCD in many applications, and Raystar Optronics now offers a 5.2″ TFT module designed specifically to fit the footprint of the industry standard RG24064-series 240×64 mono graphic STN LCD. The RFS520A can replace traditional STN displays of 8×2 or 16×2 format as it shares the same 16 pin footprint.

Our TFT modules are fully supported with a variety of options including wide operating temperatures, high brightness and contrast, built-in DC-DC and temperature compensation circuitry and most with white LED backlights. Resistive Touchscreens and Projected Capacitive Touchscreens are available for most models. Many panels can be configured as a kit – see our Interface Kits page for more details.

IMPORTANT ANNOUNCEMENT – Mitsubishi has decided to end production of TFT-LCD modules, as the company is no longer able to maintain the products’ competitiveness after significant price falls in the global market. Production of TFT-LCD modules is scheduled to end in June 2022 with a Last Time Buy date of June 2021. Please contact us as soon as possible to discuss last time buy or identification of suitable alternative displays.

Raystar is a professional TFT (Thin Film Transistor) module manufacturer. Whether you need a TFT display with control board, high brightness, wide viewing angle, monochrome or bar type, we have TFT active matrix display models for you to choose from.

Mitsubishi’s Electric Diode InfraRed sensor (MelDIR) is a thermal sensor for applications in the fields of security, surveillance, crime prevention, people counting, heating, ventilation and air conditioning (HVAC) and smart buildings.

LITEMAX® Industrial Display solution provide a wide range of reliable displays from 5.7″ to 85″ including LCD panel modules, open frame LCD displays, outdoor displays, and panel mount monitors. LITEMAX have developed and focused on LCD display technologies such as high brightness technology, optical bonding solutions, and color enhancement technology that bring more add-on value to enhance their products.

If customers would need sunlight readable displays solution for the applications, Winstar High Brightness TFT Display solution is as a good solution. Winstar high brightness TFT LCD panel is featured with brightness up from 800 nits to 1100 nits. Please note the brightness will be lower if the module require touch panel or O-Film on it.

These models are also available in resistive touch panel and capacitive touch panel, but the brightness would be affected after adding the touch panel. Winstar Sunlight Readable LCD Modules (High Brightness TFT Display) are suitable for outdoor applications. Winstar available high backlighting sunlight viewable TFT display sizes including 3.5", 4", 4.3", 5.7", 7", 10.1" and 12.3 inch.

1. Professional Manufacturer in LCD Display: Hongxian Technology Co., Ltd. specializes in customizing high-end LCD display, which is widely used in military industry, security, vehicle audio-visual, medical, reverse rearview mirror, industrial control equipment, smart home, visual doorbell, building elevator advertising, SIP telephone and so on.2. Accept Customization Order:We aim to provide customers with great product solutions. In order to better serve our valuable customers, we accept the customization order of the driver board, touch screen of AV, VGA, MCU, etc.

3. Advantages: a. cost leadership; b. Short delivery time; c. have resources to get original screen, since we have solid relationship with original LCD panel manufacturers such as INNOLUX、AUO、Hanstar、CPT、CMO、BOE、TIANMA;

These wide viewing angle Small Format TFT LCDs with optional touch are industrial grade and cost competitive. Therefore these products are a popular display choice to integrate in many projects.

Using only high-tech factories that we partner with, we provide clients with the service of designing liquid crystal display panel (LCD) and liquid crystal display module(LCM), and is committed to the customized service, R&D, sales, after-sales service of display products. Our factories have hundreds of engineers focusing on creating the highest quality displays including monochrome LCD (TN, STN), colour LCD (CSTN and TFT), Custom LCD’s, LCD module (both COG* and COB*) which are widely used in mobile phones and many other applications.

Our state of the art factory produces High Resolution TFT glass panel cells, has TN, HTN, STN and TFT technologies for LCD panels. The Factory has class 1000 clean rooms, high accuracy bonding, pre bonding and heat seal machinery, many production lines specifically for TFT production, OCA and OCF bonding machines,  In-House LCD glass cleansing process, output thousands of pieces per month.

Touchscreen overlay cover glass only available (so you do not have to purchase the display)These displays can come with: touchscreen components, touchscreen overlays, industrial touch screen,Wide LCDs, LED TFTs, and TFT Colour displays.

Other options are: LCD drivers, LVDS Touchscreen displays, automotive LCD Display, TFT high resolution screens, TFT LCD capacitive touchscreens, TFT capacitive touchscreens, high brightness LCDs, Letterbox Displays, small VGA Displays, LCD panel without backlights,Variations of our Small Format TFT LCDs include: TFT Display touchscreens, TFT IPS Display, monochrome displays, TFT or LCD, embedded components, LCD components, TFT Drivers, industrial range of Displays,

CDS also offers industrial TFT LCDs,Our displays are used in: touch screen vending machines, automotive touch screen displays, vending machine display panel, Touch screen vending, TFT Automotive, LCD Dislay panel kits, Touch screen TFT monitors, LCD Display components, LCD Screen components,  and POS LCD Displays.As you can see from the tables above we have sizes including:  8.8 inches, 4.3 inch LCD Display, 10.1″ TFT LCD,  3.5 inch LCD Display, 4.3 inch display, 3.5 inch TFT LCD Display, 4.3″ screen, 7 inch LCD panel, 3 inch LCD Displays, and 4.3″ TFT LCDs as well as other small LCD Display screens.We have options on and equivalents to the following displays and TFT panel manufacturers:  Raystar, Kingtech LCD, Digital View, OLED modules, OLED products, Powertip LCD Displays, Data Vision LCD, LG TFT Display, Tianma NLT, Powertip Displays, Mitsubishi LCD Displays, DMC components, Kyocera LCDs, NLT Technologies Ltd, Sharp LCD TFT modules, LCD manufacturers in the USA, PMOLED Displays, innolux display corp, Industrial touchscreens, A Grade TFT LCD Displays, Panoramic TFT Displays, Samsung TFT Displays, Touchscreen components, Transparent TFT Displays, Touchscreen components,  TFT LCD controllers, as well as other TFT LCD manufacturers and Liquid crystal Display manufacturers.

CDS offers the widest range of displays and touchscreens including Abon touchscreens, Ampire LCD distributor, alternative Prisma interface baord supplier including Prisma iiia, Solomon Goldentek, Panasonic TFT, Winmate display, USB IO, and Apollo monitors

Our range includes AMOLED, circular displays, circular monitors, circular screens, circular TFT screens, round displays, Round TFT LCD displays, TFT AMOLEDs, TFT and IPS, TFT display interface microcontroller, TFT LCD or AMOLED, TFT LCD super AMOLED, WXGA TFT Displays, and WXGA TFT screens

As well as large format displays CDS also offers DSI TFT Display, large monochrome LCD displays, mono displays, mono OLEDC displays, mono TFT LCDs, monochrome displays, PCT Touchscreens, projected capacitive touch PCT technology, sq monitors and squid IDS.

CDS added a number of additional controller boards nd accessories which include TFT adaptor boards, TFT boards, TFT display controller boards, USB c LCD controller, USB touch kit, resistive touch screen, TFT accessories com, LCD controller board, LCD controller board USB c, LCD controller board, HDMI to MiPi DSI board, HDMI to MiPi DSI bridge, HDMI to MiPi LCD controller board, EDP adaptor bard, elite C microcontroller, Displaylink DL 3000 .

Whether it be bar type LCDs or any of CDS display solutions or many TFT displays we can help with comparing mipi dsi vs lvds interfces or mipi to edp wch can include use on pos shelf displays and rgb epaper for example.

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Two separate colors (yellow and sky blue), make this graphic OLED module easy-to-read, unique display. Less than an inch diagonal, this lightweight display uses super low power, making it great for handheld devices.

An ePD retains the content of your Display without applied power. Only for changing the display-content, a short supply with power is necessary. Microtips has partnered with an experienced E-paper manufacturer. We represent a full series of E-paper technology, including true color to meet your specific needs.

Thin Film Transistor or TFT screens are active-matrix LCDs capable of controlling individual pixels on the screen. Thus, they assure better visibility than other variants. These flat-panel displays are suitable for a variety of applications owing to their wide range of beneficial features.

Round TFT LCDs are gaining popularity as they have become a perfect replacement for analog gauges, and they help make any application look versatile. Microtips Technology has introduced a new 3.4-inch round display, with a high resolution of 800 x 800 pixels.

High-definition Multimedia Interface (HDMI) is a proprietary technology used to transmit uncompressed audio and video data from an HDMI-compliant digital controller to a television, computer, video projector, or any other HDMI-compliant device. Microtips Technology has developed the 7" RFH70XB-1IW-LHS medium-sized HDMI display with an HDMI interface and a high resolution.

TFT (Thin Film Transistor) is a thin-film field-effect transistor display that is designed to visualize millions of clear, bright, and high-contrast color pixels. Over the years, this display has gained immense popularity owing to its several benefits.

The 7 inch low-cost color display is one of the most popular touch screen displays available for raspberry pi, HDMI display screen and other mini PCs. Featuring IPS screen with larger visible angle and more clear display effect, this 7 inch display with touch screen can be used in all environmental conditions because of its wide temperature liquid crystal fluid.

Microtips Technology has introduced a high brightness High-Definition Multimedia Interface (HDMI) interface IPS TFT LCD module. These modules are compatible and assure seamless interface with any version of Raspberry Pi Single Board Computers (SBCs), PCs, or devices such as HDTV, DVD player, or any device that is compatible with HDMI.

AMOLED stands for Active Matric Organic Light Emitting Diodes. This technology is environmentally friendly, and commonly used in small but complex electronic devices such as handheld instruments, meters, and smart watches. This technology is a very fine combination or OLED plus active matrix.

AMOLED (stands for Active Matrix Organic Light Emitting Diodes) display is one of the best screen technologies popularly used in today’s laptop screens and PC monitors and high-end smart phones.

The Thin-Film-Transistor display (TFT display) is an active matrix display where each pixel of the flat panel is illuminated individually. In recent times, TFT display is increasingly used in the electronics industry owing to its several benefits.

Microtips Technology, one of the leading 5-inch color TFT display module manufacturers, has introduced the new low-cost 5-inch color TFT display. The thin film transistor (TFT) technology is just another variant of the LCD technology.

Thin-film transistor (TFT) LCD displays assure improved image quality over traditional LCD displays. They offer more control over colors and images, and require less power than other technologies.

Microptips Technology has introduced a 3.9" bar type TFT display that has a high contrast ratio. This panoramic 3.9 inch RGB bar TFT LCD comes with a resolution of 480x128 pixels. This display is suitable for several modern electronic appliances like server and audio systems, auto/marine equipment, advertising displays, drone controls and many more.

Microtips Technology, one of the leading 4.3-inch TFT LCD module manufacturers, has introduced the new low-cost 4.3-inch TFT display. TFT or thin film transistor is primarily a variant of the LCD technology. TFTs are active matrix LCDs, which help improve contrast, color, and picture quality.

Thin-Film- Transistor displays or TFT displays are active matrix LCD displays that assure better color perception than regular Twisted Nematic LCDs. The demand for TFT displays has increased in recent years owing to several advantages they offer. These displays assure a clear view from any angle, and they can display millions of bright color pixels.

Microtips is proud to announce a new line of HDMI Displays designed to work seamlessly with development boards and computers like the Raspberry Pi. This video outlines our current options for these displays...

Microtips is excited to announce our 10.1”, high bright, TFT display with increased resolution and widened viewing angles. This 10.1”, WXGA 1280*800 TFT display is an IPS panel equipped with an HDMI signal input...

Microtips Technology is excited to announce our In-Cell technology for segment type LCDs. This is due to the fact that consumer electronics are becoming thinner and lighter

Simple monochrome displays, like 7 Segments & Icons, have been around for a very long time. These displays are still widely used by customers in wide variety of industries. But have you thought about Color TN Displays instead?

Regional Sales Manager, George, explains OLED Displays, their benefits, and other characteristics that make them better than standard Liquid Crystal Displays for some applications.

Did you know that you can save cost and simplify the manufacturing processes for your next product build, by simply bundling together a few complementary components? This is where Microtips value added services and component integration really shines!

Do you have a product idea but have trouble sparing the resources for production, assembly, and quality control? Perhaps you’ve completed all the engineering design and are evaluating the best manufacturing partner to handle the production, saving you the time and overhead?

There are more and more TFT displays used in outdoor applications, such as automobile display, digital signage and kiosks. High ambient light in outdoor environment often causes wash-out image and renders the screen not readable. Readability & sustainability of TFT  display under direct sunlight is becoming vital. Topway Display has been developing sunlight readable LCD display solution for years. The company understands the ins and outs of sunlight readable TFT LCD.

Visibility is the ease with which a viewer can detect an object, or in more scientific term: the relationship between luminance contrast and human eye’s threshold. Therefore, the higher an object’s contrast is, the better is its visibility.

For an LCD to be readable in outdoor environment with very bright ambient light, the LCD screen’s brightness needs to exceed the intensity of light that is reflected from the display surface. To be comfortably viewed by human eyes, the LCD’s brightness needs to exceed its reflected light by a factor of 2.5 at minimum. Naturally, to make an LCD sunlight readable, we can work on two areas, increasing brightness or reducing reflectance.

On a clear day in direct sunlight, the ambient brightness is about 6000 cd/m2. And a typical TFT LCD with touch screen reflects about 14% of ambient light, which is around 840 cd/m2. These days, most LCD displays use LED backlight as light source. It is not too difficult to increase an LCD’s brightness to 800 ~ 1000 Nits, to overpower the bright reflected sunlight. Thus, you have a sunlight readable TFT LCD.

However, this method requires more backlight LEDs and/or higher driving current. The drawbacks are high power consumption, more heat dissipation, increased product size and shorter LED backlight lifespan. Apparently, increasing backlight to make TFT LCD sunlight-readable is not a very good solution.

Transflective TFT LCD is a TFT LCD with both transmissive and reflective characteristics. A partially reflective mirror layer is added between LCD and backlight. This change turns part of the reflected ambient light into LCD’s light source, increasing the TFT display’s brightness. However, transflective TFT LCD is more expensive than transmissive one. At the same time, the partially reflective mirror layer will block some of the backlight, making it not ideal in indoor or low ambient light environment.

The total reflectance on a TFT LCD with touch panel is the sum of reflected light on any interface where two materials meet. As an example, between polarizer and display glass, the difference in index of refractions for the two materials is very small, around 0.1. So the reflected light on this interface is only 0.1%. As Fresnel’s equation points out, we should focus reflection reduction on air interfaces. For air, its index of refraction is 1; for glass, it is 1.5. And that results in a reflectance of 4.5%. Therefore, the three air interfaces contribute majority of TFT LCD’s reflectance, at about 13%.

For food industry application, shattered glass is a serious problem. An LCD screen with external film solves this issue nicely. As for automotive applications, in an accident, broken LCD with top AR film won’t produce sharp edge glass that could harms auto occupant. Nevertheless, a top film always reduces TFT LCD’s surface hardness. And it is susceptible to scratches. On the other hand, AR coating retains LCD’s hardness and touch performance. But it comes with a bigger price tag.

Another quick and easy way to tackle reflectance is to affix a linear polarizer on the top of TFT screen. When ambient light gets to the top polarizer, only half of the light passes through. Which results in reflection light cutting to half. This is a very low cost way to increase TFT LCD’s contrast, such that making it more sunlight readable.

Laminating a circular polarizer in TFT LCD will get rid of a lot of reflectance. That is because when ambient light passes through circular polarizer it gets circularly polarized. And when it is reflected, the polarization direction flips by 180 degrees. So when reflected light comes back to the circular polarizer, nothing goes through to viewer’s eyes.

This method is very effective for an LCD display with resistive touch panel. We know resistive touch LCD has two air gaps: air gap between two ITO layers and air gap between touch panel and LCD display. Reflectance caused by the two air gaps is very high. Applying circular polarizer blocks off most of the reflected light, and makes the LCD display sunlight readable.

The disadvantage of such solution is its cost. Since we need not only a circular polarizer, but also a retarder film on the top of LCD display, making sure light originates from within LCD is not blocked by external circular polarizer.

Add AR films on both interfaces of internal air gap. The add-ons can reduce this area’s reflection from 8.5% to 2%. And since the AR films are not outside facing, they are much cheaper than the one used outside. Keeping the air gap also retains the ease of service, in case either touch panel or LCD display needs to be repaired.

The most effective way is to eliminate air gap totally, by using optical bonding. In plain language, we fill air gap with special optical adhesive, to smooth out the area’s refraction index differences. Such that reflectance caused by internal air gap drops from 8.5% to 0.5%. Optical bonding is expensive but effective way to improve TFT LCD sunlight readability. It enhances durability and resistance to impact. Moreover, no air gap means no moisture condensation and fogging.

There are many ways to make TFT LCDsunlight readable. They all have their own pros and cons. With 20+ years" LCD design and manufacturing experience, Topway knows how to create the best sunlight readable TFT LCD for challenging environments. Leave us a message and let"s start the conversation of creating suitable sunlight readable TFT LCD for your project.

Some companies have individual demands and requirements on their LCD panels and that`s why our liquid crystal displays are so individual. We offer individualised display solutions for nearly every requirement. Kit with LCD modules with controller cards and cable set

The drive electronics, cable sets and display systems, available at distronik, are perfectly adapted to your individual wishes and requirements. These display kits are not only compiled, but also tested. The advantages are clear: easy and quick installation of your industrial display and control electronics. The components of our display kits work perfectly together so you don`t have to matter about it.

The biggest advantage of our display solution is that you only have one supplier. That guarantees operative TFT display kits for your visualisation systems.

The hyper dimming technology applies the new PWM method to expand the dimming range higher than the previous generation of analog methods. The traditional methods for dimming enhancement are by adjusting the lamp current or by regulating the average current feeding the CCFL inverter. This dimming method is referred to as "analog dimming." This provides the highest efficiency circuits, limiting the dimming range or violating lamp specifications to achieve wide dimming ratios.

The "Pulse Width Modulation" (PWM) technology overcomes this problem, expanding the dimming range. We pulse the backlight at the full rated lamp current and modulate intensity by varying the time the lamp operates at the full rated current. PWM dimming can significantly extend the dimming range capabilities. PWM control of multiple lamps eliminates the typical problem of one lamp extinguishing before others at low intensities. Lamp layout and parasitic are no longer the limitations for display dimming capabilities.

With the user-friendly VR knob, it is possible to reach a truly dim-to-black state which allows for night vision operation. Combining the high-quality TFT LCD panel with a smoothly dimmable backlight offers crisp and excellent contrast images that fulfill most of the requirements of marine applications.

We are ready to share our knowledge of marketing worldwide and recommend you suitable products at most aggressive costs. So Profi Tools offer you finest benefit of money and we are ready to produce alongside one another with Tft Color Lcd, Transparent Lcd, Tft Lcd Color Monitor, We will make greater efforts to help domestic and international buyers, and create the mutual benefit and win-win partnership between us. we are eagerly waiting for your sincerely cooperation.

We can easily normally satisfy our respected buyers with our excellent high-quality, excellent selling price and good service due to we"ve been far more expert and more hard-working and do it in cost-effective way for Best Price on High Brightness Tft Lcd Module - 5.0 inch 480×480 Special Design Round Color TFT LCD Display – DISEN , The product will supply to all over the world, such as: South Korea, Austria, Turkey, It is our customers" satisfaction over our products and services that always inspires us to do better in this business. We build mutually beneficial relationship with our clients by giving them large selection of premium car parts at marked down prices. We provide wholesale prices on all our quality parts so you are guaranteed greater savings.

As a TFT LCD manufacturer, we import mother glass from brands including BOE, INNOLUX, and HANSTAR, Century etc., then cut into small size in house, to assemble with in house produced LCD backlight by semi-automatic and fully-automatic equipment. Those processes contain COF(chip-on-glass), FOG(Flex on Glass) assembling, Backlight design and production, FPC design and production. So our experienced engineers have ability to custom the characters of the TFT LCD screen according to customer demands, LCD panel shape also can custom if you can pay glass mask fee, we can custom high brightness TFT LCD, Flex cable, Interface, with touch and control board are all available.

Let us start with the basics first; refresh the knowledge about TN and LCD displays in general, later we will talk about TFTs (Thin Film Transistors), how they differ from regular monochrome LCD displays. Then we will go on to the ghosting effect, so we will not only discuss the technology behind the construction of the TFT, but also some phenomena, like the ghosting effect, or grayscale inversion, that are important to understand when using an LCD TFT display.

Next, we will look at different technologies of the TFT LCD displays like TN, IPS, VA, and of course about transmissive and transflective LCD displays, because TFT displays also can be transmissive and transflective. In the last part we will talk about backlight.

Let us start with a short review of the most basic liquid crystal cell, which is the TN (twisted nematic) display. On the picture above, we can see that the light can be transmit through the cell or blocked by the liquid crystal cell using voltage. If you want to learn more about monochrome LCD displays and the basics of LCD displays, follow this link.

What is a TFT LCD display and how it is different from a monochrome LCD display? TFT is called an active display. Active, means we have one or more transistors in every cell, in every pixel and in every subpixel. TFT stands for Thin Film Transistor, transistors that are very small and very thin and are built into the pixel, so they are not somewhere outside in a controller, but they are in the pixel itself. For example, in a 55-inch TV set, the TFT display contains millions of transistors in the pixels. We do not see them, because they are very small and hidden, if we zoom in, however, we can see them in every corner of each pixel, like on the picture below.

On the picture above we can see subpixels, that are basic RGB (Red, Green, Blue) colors and a black part, with the transistors and electronic circuits. We just need to know that we have pixels, and subpixels, and each subpixel has transistors. This makes the display active, and thus is called  the TFT display. TFT displays are usually color displays, but there are also monochrome TFT displays, that are active, and have transistors, but have no colors. The colors in the TFT LCD display are typically added by color filters on each subpixel. Usually the filters are RGB, but we also have RGBW (Red, Green, Blue, White) LCD displays with added subpixels without the filter (White) to make the display brighter.

Going a little bit deeper, into the TFT cell, there is a part inside well known to us from the monochrome LCD display Riverdi University lecture. We have a cell, liquid crystal, polarizers, an ITO (Indium Tin Oxide) layer for the electrodes, and additionally an electronic circuit. Usually, the electronic circuit consists of one transistor and some capacitors to sustain the pixel state when we switch the pixel OFF and ON. In a TFT LCD display the pixels are much more complicated because apart from building the liquid crystal part, we also need to build an electronic part.

That is why TFT LCD display technologies are very expensive to manufacture. If you are familiar with electronics, you know that the transistor is a kind of switch, and it allows us to switch the pixel ON and OFF. Because it is built into the pixel itself, it can be done very quickly and be very well controlled. We can control the exact state of every pixel not only the ON and OFF states, but also all the states in between. We can switch the light of the cells ON and OFF in several steps. Usually for TFT LCD displays it will be 8-bit steps per color, so we have 256 steps of brightness for every color, and every subpixel. Because we have three subpixels, we have a 24-bit color range, that means over 16 million combinations, we can, at least theoretically, show on our TFT LCD display over 16 million distinct colors using RGB pixels.

Now that we know how the TFT LCD display works, we can now learn some practical things one of which is LCD TFT ghosting. We know how the image is created, but what happens when we have the image on the screen for a prolonged time, and how to prevent it. In LCD displays we have something called LCD ghosting. We do not see it very often, but in some displays this phenomenon still exists.

If some elements of the picture i.e., your company logo is in the same place of the screen for a long period of time, for couple of weeks, months or a year, the crystals will memorize the state and later, when we change the image, we may see some ghosting of those elements. It really depends on many conditions like temperature and even the screen image that we display on the screen for longer periods of time. When you build your application, you can use some techniques to avoid it, like very rapid contrast change and of course to avoid the positioning the same image in the same position for a longer time.

You may have seen this phenomenon already as it is common in every display technology, and even companies like Apple put information on their websites, that users may encounter this phenomenon and how to fix it. It is called image ghosting or image persistence, and even Retina displays are not free of it.

Another issue present in TFT displays, especially TN LCD displays, is grayscale inversion. This is a phenomenon that changes the colors of the screen according to the viewing angle, and it is only one-sided. When buying a TFT LCD display, first we need to check what kind of technology it is. If it is an IPS display, like the Riverdi IPS display line, then we do not need to worry about the grayscale inversion because all the viewing angles will be the same and all of them will be very high, like 80, 85, or 89 degrees. But if you buy a more common or older display technology type, like the TN (twisted nematic) display, you need to think where it will be used, because one viewing angle will be out. It may be sometimes confusing, and you need to be careful as most factories define viewing direction of the screen and mistake this with the greyscale inversion side.

We know already that TN (twisted nematic) displays, suffer from grayscale inversion, which means the display has one viewing side, where the image color suddenly changes. It is tricky, and you need to be careful. On the picture above there is a part of the LCD TFT specification of a TN (twisted nematic) display, that has grayscale inversion, and if we go to this table, we can see the viewing angles. They are defined at 70, 70, 60 and 70 degrees, that is the maximum viewing angle, at which the user can see the image. Normally we may think that 70 degrees is better, so we will choose left and right side to be 70 degrees, and then up and down, and if we do not know the grayscale inversion phenomena, we may put our user on the bottom side which is also 70 degrees. The viewing direction will be then like a 6 o’clock direction, so we call it a 6 o’clock display. But you need to be careful! Looking at the specification, we can see that this display was defined as a 12 o’clock display, so it is best for it to be seen from a 12 o’clock direction. But we can find that the 12 o’clock has a lower viewing angle – 60 degrees. What does it mean? It means that on this side there will be no grayscale inversion. If we go to 40, 50, 60 degrees and even a little bit more, probably we will still see the image properly. Maybe with lower contrast, but the colors will not change. If we go from the bottom, from a 6 o’clock direction where we have the grayscale inversion, after 70 degrees or lower we will see a sudden color change, and of course this is something we want to avoid.

We will talk now about the other TFT technologies, that allow us to have wider viewing angles and more vivid colors. The most basic technology for monochrome and TFT LCD displays is twisted nematic (TN). As we already know, this kind of displays have a problem with grayscale inversion. On one side we have a higher retardation and will not get a clear image. That is why we have other technologies like VA (Vertical Alignment), where the liquid crystal is differently organized, and another variation of the TFT technology – IPS which is In-Plane Switching. The VA and IPS LCD displays do not have a problem with the viewing angles, you can see a clear image from all sides.

Nowadays all TV sets, tablets and of course mobile phones are IPS or VA. You can turn them around and see the image clear from all sides. But, for monitor applications the TN technology is still widely used, because the monitor usually is in front of you and most of the time you look directly at it, from top, left or right side, but very rarely from the bottom, so the grayscale inversion viewing angle can be placed there. This technology still is very practical because it is affordable and has some advantages for gamers because it is very fast.

Apart from the different organization of the liquid crystals, we also organize subpixels a little bit differently in a VA and IPS LCD displays. When we look closer at the TN display, we will just see the subpixels with color filters. If we look at the VA or IPS display they will have subpixels of subpixels. The subpixels are divided into smaller parts. In this way we can achieve even wider viewing angles and better colors for the user, but of course, it is more complicated and more expensive to do.

The picture above presents the TN display and grayscale inversion. For IPS or VA technology there is no such effect. The picture will be the same from all the sides we look so these technologies are popular where we need wide viewing angles, and TN is popular where we don’t need that, like in monitors. Other advantages of IPS LCD displays are they give accurate colors, and wide viewing angles. What is also important in practice, in our projects, is that the IPS LCD displays are less susceptible to mechanical force. When we apply mechanical force to the screen, and have an optically bonded touch screen, we push the display as well as squeeze the cells. When we have a TN display, every push on the cell changes the image suddenly, with the IPS LCD displays with in-plane switching, different liquid crystals organization, this effect is lesser. It is not completely removed but it is much less distinct. That is another reason IPS displays are very popular for smartphones, tablets, when we have the touchscreens usually optically bonded.

Now, let us look at the backlight types. As we see here, on the picture above, we have four distinct types of backlight possible. The most common, 95 or 99 per cent of the TFT LCD displays on the market are the transmissive LCD display type, where we need the backlight from the back. If you remember from our Monochrome LCD Displays lecture, for transmissive LCD displays you need the backlight to be always on. If you switch the backlight off, you will not see anything. The same as for monochrome LCD displays, but less popular for TFT displays, we have the transflective LCD display type. They are not popular because usually for transflective TFT displays, the colors lack in brightness, and the displays are not very practical to use. You can see the screen, but the application is limited. Some transflective LCD displays are used by military, in applications where power consumption is paramount; where you can switch the backlight off and you agree to have lower image quality but still see the image. Power consumption and saving energy is most important in some kind of applications and you can use transflective LCD displays there. The reflective type of LCD displays are almost never used in TFT. There is one technology called Low Power Reflective Displays (LPRD) that is used in TFT but it is not popular. Lastly, we have a variation of reflective displays with frontlight, where we add frontlight to the reflective display and have the image even without external light.

Just a few words about Low Power Reflective Displays (LPRD). This kind of display uses environmental light, ambient light to reflect, and produce some colors. The colors are not perfect, not perfectly clear, but this technology is becoming increasingly popular because it allows to have color displays in battery powered applications. For example, a smartwatch would be a case for that technology, or an electrical bike or scooter, where we can not only have a standard monochrome LCD display but also a TFT LCD color display without the backlight; we can see the image even in

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strong sunlight and not need backlight at all. So, this kind of TFL LCD display technology is getting more and more popular when we have outdoor LCD displays and need a low power consumption.

On the picture above, we have some examples of how transmissive and reflective LCD displays work in the sunlight. If we have a simple image, like a black and white pattern, then on a transmissive LCD display, even with 1000 candela brightness, the image probably will be lower quality than for a reflective LCD display; if we have sunlight, we have very strong light reflections on the surface of the screen. We have talked about contrast in more detail in the lecture Sunlight Readable Displays. So, reflective LCD displays are a better solution for outdoor applications than transmissive LCD displays, where you need a really strong backlight, 1000 candela or more, to be really seen outdoors.

To show you how the backlight of LCD displays is built, we took the picture above. You can see the edge backlight there, where we have LEDs here on the small PCB on the edge, and we have a diffuser that distributes the light to the whole surface of LCD screen.

In addition to the backlight, we have something that is called a frontlight. It is similar to backlight, it also uses the LEDs to put the light into it, but the frontlight needs to be transparent as we have the display behind. On the example on the picture above we can see an e-paper display. The e-paper display is also a TFT display variation, but it is not LCD (liquid crystal), it is a different technology, but the back of the display is the same and it is reflective. The example you see is the Kindle 4 eBook reader. It uses an e-paper display and a frontlight as well, so you can read eBooks even during the night.

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I have bought a 2.5" TFT shield online, which is equipped with the ILI9341 controller. I need to dim the intensity of the background LEDs to match ambient light.

This particular shield does not provide a pin to control the intensity of the LEDs with PWM via a separate input, so I need to dim the background LEDs of this display via software.

I wrote a new function to set the display"s brightness by controlling the background LEDs, but something is missing as I can seem to be writing correctly to the display. So I"m trying to get the display to answer to a known command first, like 0x28 (Display Off).

I can get the display to react to the Display Off command (0x28), but only when I issue it in the begin(..) function. So, the original code in Adafruit_TFTLCD.cpp is like this:

First, the display screen on a sunlight readable/outdoor readable LCD should be bright enough so that the display is visible under strong sunlight. Second, the display contrast ratio must be maintained at 5 to 1 or higher.

Although a display with less than 500 nits screen brightness and a mere 2 to 1 contrast ratio can be read in outdoor environments, the quality of the display will be extremely poor. At i-Tech, a truly sunlight readable display is typically considered to be an LCD with 1000 nits or greater screen brightness with a contrast ratio greater than 5 to 1. In outdoor environments under the shade, such a display can provide an excellent image quality.

Luminance is the scientific term for hotopic Brightness?which specifies the visual brightness of an object. In layman"s terminology, it is commonly referred to as brightness? Luminance is specified in candelas per square meter (Cd/m2) or nits. In the US, the British unit Foot-lamberts (fL) is also frequently used. To convert from fL to nits, multiply the number in fL by 3.426 (i.e. 1