One of the problems encountered with outdoor displays is that sunlight readability is significantly affected. Readability is affected by three main reasons. 1:
1. strong sunlight, the brightness of the LCD screen is not enough to see the display.
2. the surface of the protective glass is smooth and the sunlight reflection rate is too high. 3. the surface of the protective glass and the LCD is smooth and the reflection rate is too high.
3. the refraction and reflection of the air layer between the protective glass and the LCD screen on the readability.
Improving the readability of outdoor displays is a challenge that involves several technical aspects, especially in bright environments with direct sunlight. Here are some key solutions:
1. Increase the brightness of the display itself
Adopt high brightness LED backlight: High brightness LED chips can effectively increase the brightness of the display while reducing the heat and power consumption of the backlight. By increasing the number of LED wicks or adopting more efficient LED chips, the brightness of the display can be increased by 30%~50%, thus balancing the light from the environment and making the display still visible under strong outdoor light.
Reasonable design of light guide plate: The design of light guide plate is crucial for improving the light efficiency of the display. By optimizing the structure and material of the light guide plate, the backlight source can be used more effectively to improve the brightness uniformity and contrast of the display.
2. Reduce the reflected light of the display
Anti-reflective (Anti-Reflective, abbreviated as AR), by adding AR coating on the surface of the display, can significantly reduce the reflection between the air and the glass surface, thus improving the readability of the display in the outdoor.
Anti-glare (Anti-glare, abbreviated as AG) anti-glare treatment is through the etching of the way, so that the originally smooth glass surface becomes rough, the touch feel similar to touching the paper, so that the specular reflection becomes diffuse reflection. This also significantly improves the readability of the display under sunlight.
Adopt optical binding technology: Optical binding is the process of laminating the cover glass or touch screen onto the display module, eliminating reflections between different media by completely filling the structure of the adhesive with transparent materials (e.g., OCA chemical transparent adhesive). At the same time, optical binding can also increase the strength of the module, reduce the risk of water vapor entry, is the best screen lamination process.
3. Other solutions
Improve display contrast:
By optimizing the driving circuit of the display and the arrangement of liquid crystal molecules, the contrast of the display can be improved to make the image clearer.
Adopt high transmittance materials:
Selecting materials with high transmittance to make the polarizer, filter and other components of the display can improve the light transmission rate, thus enhancing the brightness of the screen.
Intelligent brightness adjustment:
Through the built-in illumination sensor, the brightness of the display is automatically adjusted according to the strength of the ambient light to achieve the best display effect.
Improving the readability of outdoor displays requires a combination of solutions that enhance the brightness of the display itself, reduce reflected light from the screen, and other solutions. The combined application of these solutions can significantly improve the readability of outdoor displays in bright light environments, providing users with a better visual experience.