Sunlight Readable TFT

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Optical bonding + Surface treatment

sentiment:2472 Published time :2018-07-12 22:40

Generally, the visibility of the liquid crystal display in the sun or strong light is relatively low due to the reflection on the surface of the liquid crystal screen. In order to realize that the LCD screen can still maintain a clear display under sunlight or strong light, one common processing methods are to increase the brightness of the backlight, adding a high-brightness backlight can improve the visibility of the LCD screen under strong light, but it also has some shortcomings. For example, increasing the brightness also increases the power consumption. This requires solving the problems of heat dissipation, vibration resistance, and impact resistance.

High reflections at untreated surface interface cause “display wash-out”.

And the other is to add special treatment on the surface of the LCD screen to make the light penetrate and not reflect, mainly optical bonding. The process is designed to perform in a high ambient light environment, which occurs when the amount of light reflected by a display is close to or exceeds the amount of light emitted by the display. Direct sunlight can have illumination of greater than 100,000 lux. When this ambient light is reflected off of a display’s untreated glass or plastic surfaces, the contrast loss can be close to 100% and will cause “wash-out” as the display’s luminance is exceeded. In addition, high ambient light can cause thermal loading of the display system. In particular, LCDs are affected when the “clearing temperature” of the liquid crystals is exceeded, causing the display’s contrast to degrade.

Optical bonding is a technical solution to enhance the optical performance of the LCD screen. It can make the LCD screen clearly visible under a variety of strong light, which can perfectly solve the display problem of the outdoor LCD screen. After bonding, the LCD screen has clear and readable optical performance in the sun, and can be adapted to outdoor all-weather display. It is a high-tech LCD display enhancement technology. Its main advantages: you can clearly see the delicate images and text in the sun, the display colors are vivid and bright, the contrast is greatly enhanced, the emitted light is reduced, and the display viewing angle is wide. Using the LCD screen with optical bonding technology, users can clearly read the display content and images under direct sunlight, which can fully meet the actual needs of military outdoor display equipment, outdoor advertising display screens and business presentations. The LCD screen using optical bonding technology can effectively absorb vibration, has good shock resistance and vibration resistance, can eliminate the pressure water ripple phenomenon on the LCD screen, and enhance the waterproof performance, heat dissipation performance and excellent low air pressure. Performance, etc. It can adapt to various harsh environments and effectively extend the service life of the LCD screen.

The principle of optical bonding to realize visibility under strong light: In order to increase the readability of the LCD screen under strong light, the external contrast of the LCD screen must be increased. Optical bonding increases the external contrast by reducing the brightness of the reflected light on the surface of the LCD screen. For the optical bonding screen, the bonding glass is bonded to the polarizer on the front surface of the LCD screen with a transparent optical glue. Since the refractive index glass of the optical glue is almost the same, both are 1.49, the two reflective surfaces are eliminated. At the same time, the outer surface of the bonding glass is coated with an AR or AR/AG layer, so that the entire reflectance of the external light is only 0.4%. Lower reflection loss means higher contrast.

Surface reflections reduced via optical bonding.