tft display in sunlight factory

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.

What causes light reflection? When light traveling in one transparent medium encounters a boundary with another transparent medium, a portion of the light bounces off the border. Through the simplest version of Fresnel’s equation, we can calculate the amount of reflected light.

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%.

The quick and easiest thing we can do to reduce air-glass interface reflectance is to use an Anti-Reflection and Anti-Glare film or apply AR coating. An external film with AR properties not only reduces reflected light, but also brings other benefits.

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.

Sunlight readable TFT displays feature high brightness LCD backlights, making them an excellent option for bright ambient light or direct sunlight environments. Our sunlight readable TFT displays are available with or without touchscreen features and come with different formats and display modes to fit any application.

I have the same question as Pieter. From the ST7282 datasheet, it is not possible to send any commands or change any registers without using the serial interface, and that serial interface is not provided on the 40-pin flex.

Even if this is true, there are still ST7282 registers that users might want to change. For example, on pages 39-40 of the datasheet, I see registers for setting brightness, contrast, and gamma. These will not be accessible.

Is there a demo of this display to prove that it actually works? Because leaving out the serial interface seems like it might have been a mistake made by the designers. I just want to make sure that this module actually functions.

> Regarding the software part,there is no need to make the setting for any registers as all of them are default value and doesn"t support to change, you just need to make the setting for VSYNC,HSYNC,DCLK Period, DCLK Frequency in your initialization code and you could get the parameters from ST7282 datasheet page 60.

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 3.2", 3.5", 4", 4.3", 5.7", 7", 10.1" and 12.3 inch.

degrees. So, in this range we are safe, we can go very low with the temperature, and it will not become solid, and we can go very high with the temperature up to 110 degrees and it will not become isotropic.

Maybe you have even seen some displays that were used outdoors and sometimes they become black. We call that the blackening effect. If they become black, that means the crystals become isotropic. You can sometimes see that the part of the display is black or sometimes the whole display becomes black, depending on the temperature. The good thing is that it is not damaging the display, so once the temperature drops it goes back to the nematic phase and the display is working again, but in a high temperature you cannot see anything on the display, it is not working.

On the picture above, we have an example from a data sheet of a display with high temperatures. As we said it’s a liquid crystal from -40 to +110 degrees, and this is the latest technology. But you need to be careful! This is only about the surface of a display, the TFT glass itself. If we have the sunlight going to the display it can increase the temperature of the whole display as a module.

For the whole display module, the operating temperature range can be as low as 0 to +50 degrees or -20 to 70 degrees. We can have two operating temperatures, that means if we use the display outdoors, we are safe from the sunlight, the surface of the display can go very high, but we need to control the ambient temperature inside the display housing to not go too high. +50 or +70 will be maximum, usually we need fans to remove the heat from inside. Typically, in our case we have a computer inside and we have more devices that cannot work at high temperatures like +100 degrees, so we control the temperature anyway. So, the temperature cannot be too high inside and for sure cannot be that high as a liquid crystal itself can withstand, which is +110 degrees.

And that will be all in this article about contrast, brightness, and temperatures. Just one more thing: if you are planning on buying a laptop today, you can find brightness in the specification. Look at this number because this will determine how good your laptop will be outdoors. There are laptops on the market today that will have 1000 candelas or even more. If you are looking for a new device my recommendation also goes for mobile phones. Low brightness mobile phones can have 300, maybe 500 candelas, but nowadays the standard will be around 1000 candelas, but there are phones on the market that already have 1500 or even 1800 candelas. That means if you are in the sunlight you will still be able to see the image clearly. Of course, the battery will be drained faster, but sometimes it is not so important, maybe you just want to check something quickly, to read something and you want to have a clear image just be aware that this number is pretty important when you buy new devices!

Most standard TFT display and monitors are rated between 200 and 300 (cd/m²). If it installed indoors, these displays are usually of sufficient brightness to be easily read. But for use in outdoor environment or even direct sunlight, you will find that content on TFT displays with normal brightness is often difficult to read. Reflection is the major reason. It is difficult to read your screen in bright sunlight, as the strong light reflecting off the screen"s surface washes out the display.

There are many technologies to increase the outdoor viewing ability of an LCD display such as high brightness backlight, transflective LCD, optical bonding and surface treatment. However, each has benefits and drawbacks depending on the specific application.

Increasing the brightness is the most common method to improve readability. High Brightness TFT LCD Module features powerful LED backlights, providing the brightness up to 1,000(cd/m²). Typically, LCD brightness of 800 (cd/m²) or higher is considered sunlight readable, but most sunlight readable displays are 1,000(cd/m²). It is possible to change the display brightness by applying more LED backlights without modifying the size or dimensions of the TFT-LCD. However, adding more backlights result in much greater power consumption and shorter battery life. It"s not a perfect solution, but it does help improve the visibility in bright condition.

The other option to enhance visibility is using Transflective TFT Displays. Transflective is a form of LCD that is able to reflect most of the ambient light allowing it to be visible in bright sunlight without using a backlight. It is one of the most flexible solutions as it allows daylight to pass through with lower power consumption in bright environments and readability in any lighting condition.

Optical bonding decreases light refraction (from both LCD backlight and outside light), thus improves TFT screen"s readability. Optical bonding is the process of laminating cover glass or touchscreens to the LCD cell with a layer of resin (Liquid-OCR) or film(Dry-bond process OCA). It enables the connection of the touch sensor, cover glass and display to one unit. One of benefits is to completely fill the air gap and eliminate two reflective surfaces between them.

• Greater durability：It creates an air gap between the LCD cell and the screen glass with air bonding* technology. Full bonding technology filling of the gap prevents this problem from arising and provides high durability for use in factories, or other harsh environments.

• Dust & Moisture Protection：Condensation can cause screens to become foggy from moisture that penetrates the air gap. The most obvious benefit of optical bonding technology is that it physically prevents dust and liquid ingress from getting between the glass and LCD.

• Improved touch experience：A touch panel with optical bonding maintains a more accurate touch response by eliminating air gap between the cover glass and the display.

To further improve readability under direct sunlight, Anti-Reflection and Anti-Glare coating can be applied to the surface reducing ambient light reflectance. AR/AG coatings can be applied directly to an LCD or a substrate material such as a protective cover lens or touch sensor.

• AG(Anti-Glare Coating)：This type of treatment is often described as a matte coating that reduces surface reflection on the front of the LCD panel and softens the direct light source. Therefore, it has some impact on contrast and color vibrancy because of the matte surface.

• AR(Anti-Reflection Coating)：AR (anti-reflective) film can reduce unwanted surface reflections caused by ambient light and enable you to see the screen with great clarity.

Sunlight readable Digital Displays – CDS has the widest range and variety of hibrite sunlight readable LCD display solutions and industrial hi-brite LCD TFT displays for applications in direct sunlight.

There are different hibrite TFT panel technologies available to achieve sunlight readability in environments with very bright ambient environments, with high brightness up to 5000 nits! The most common way is to upgrade the backlight to dramatically increase brightness with our high-quality LED backlights. However, we also have factory manufactured super high bright panels featuring optical bonding technology in order to make our TFT panels sunlight readable.

Although high brightness displays will generate more heat and use more power than a traditional LCD ours utilise the latest low power high bright LEDs to keep power consumption to a minimum.

To get a clear image under the sunlight, the high brightness displays should be over 700cd/㎡ +,with good contrast and ideally 1000cd/m² +. This is because the illumination of ambient daylight is around 30,000㎡(107,600 LUX). Our high brightness LCDs are possible up to 2,500㎡ and designed with proprietary technologies and produced at our well-equipped factory.

Features include; enhanced high brightness panel (LED backlight) to ensure optimum readability at extreme environments, and an LED Driver to offer the advantages of high uniformity, low EMI noise and power consumption, long life and halogen free.

Our high brightness display products have been installed in locations around the world for the outdoor applications such as outdoor KIOSK, Fuel pumps, Ticket Vending Machines (TVMs), Outdoor ATM, Military, Marine etc.

Alternatively, Optical Bonding is a great technology for sunlight readability on our high brightness displays.  Optical Bonding is a process in which an optical gel is bonded between your LCD and a cover glass or touchscreen.  The gel behind the glass stops any condensation, strengthens the front glass, and also improves sunlight readability.  It also keeps power and heat down as does not affect the backlight in any way.

Our displays outperform commercial products that washout in sunlit conditions. Superior quality and readability make these displays an ideal solution for factory automation, marine/mobile and process control applications.

Our proprietary backlight technology was developed for high brightness displays and Outdoor readable Display Monitors requiring a luminance level of at least 700 nits (cd/m²) as required for outside viewing.

Other improvements include significantly reduced power consumption, increased reliability and extended lifetime of the Sunlight readable Digital Displays and high brightness display systems.

CDSSunlight readable Digital Displays alsoinclude ….… High brightness LED Displays, square Displays, waterproof marine Displays, widescreen Displays, display showcases,  curved touch screen Displays, large square Displays, IP65 and IP66 Displays, Digital Display screens, square computer Displays, Industrial LCD Displays, largest ultra-wide Display, daylight readable Displays, touch overlay for Displays, ultra-wide touch screen Display, large capacitive touchscreen Displays, square LCD Displays, kiosk screens, infrared touch screen Display, clear touch screen Displays, weather proof IP66 Displays, marine LCD Displays,  interactive touchscreen Display, one glass solutions, embedded Displays, USB touchscreen Displays, low power LCD Displays, kiosk touch Displays, high brightness Displays,  LCD Display, outdoor Display screens, multi-touch Display, Dynascan Displays, dual touch screen Displays, outdoor digital screen displays, square HDMI Display, touchscreen overlays for Displays, optical bonding Displays as well as optically bonded Displays, water resistant touch screen Displays, glass touch screen Displays,  waterproof touch screen Displays, mini USB Display touch, video wall display Displays,  high bright TFTs, high bright TFT LCD, high bright TFT Displays, high brightness Displays, sunlight readable TFT LCD Displays, High Bright LCDs, High Brightness TFT modules, high bright TFT-LCD, enhanced brightness Displays, anti-reflective, anti-glare coatings, high brightness TFT LCD modules, High Bright TFTs, high brightness TFT-LCD, High Brightness TFT Displays, LED backlights, high ambient brightness, high brightness TFT Displays, sunlight readable displays, resistive touch panel, capacitive touch panel, high brightness TFT Display, high back lighting sunlight viewable TFT Display, 10.1″ high bright colour PCAP TFT LCD Display, 5.7″ high bright TFT Display module, full colour TFT display module, high screen luminance, ultra-bright TFT LCD, low cost high end TFT modules, ultra-bright 1300nit backlights, optical bonded anti-reflective overlays, sunlight readability,  and advertising Displays LCD.

Sunlight readable TFT LCD display: By high brightness backlight, we can make sunlight readable LCD modules such as our 2.0inch 240x320 1000nits, 3.34 inch round display 320x320 750nits, 3.5inch IPS 320x480 2000nits, 3.5inch 320x240 600nits, 4.3inch 480x272 800nits, 5.0inch 800x480 1000nits, 7.0inch 800x480 and 1024x600 1000nits, 10.1inch wide temperature LCD display 1280x800 IPS 1000nits.... For other sizes of sunlight readable screen, we can custom made high brightness sun readable LCD displays for you too. As a LCD factory, we can produce qualified sunlight readable touch screens and our sunlight readable LCD prices are competitive in the market. Feel free to contact us.

Sunlight readable TFT LCD display: By high brightness backlight, we can make sunlight readable LCD modules such as our 2.0inch 240x320 1000nits, 3.34 inch round display 320x320 750nits, 3.5inch IPS 320x480 2000nits, 3.5inch 320x240 600nits, 4.3inch 480x272 800nits, 5.0inch 800x480 1000nits, 7.0inch 800x480 and 1024x600 1000nits, 10.1inch wide temperature LCD display 1280x800 IPS 1000nits.... For other sizes of sunlight readable screen, we can custom made high brightness sun readable LCD displays for you too. As a LCD factory, we can produce qualified sunlight readable touch screens and our sunlight readable LCD prices are competitive in the market. Feel free to contact us.

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