Working principle of LCD light guide plate
Release time:2025-09-29
The optical grade acrylic sheet is used to absorb the light emitted from the lamp and stop on the surface of the optical grade acrylic sheet. When the light reaches each light guide point, the reflected light will diffuse to various angles, and then break the reflection conditions and be emitted from the front of the light guide plate. Through various light guide points of different densities and sizes, the light guide plate can emit light uniformly. The purpose of the reflective sheet is to reflect the light exposed on the bottom back into the light guide plate to improve the efficiency of light use.
The design principle of the light guide plate originates from the LCD display screen of a laptop, which is a high-tech product that converts a line light source into a surface light source. The optical grade acrylic (PMMA)/PC is used as the substrate, and the backlight module technology of the LCD display screen and laptop is applied. Through the high light conductivity of the light guide point, the computer calculates the light guide point to refract the light of the light guide plate into a uniform light state of the surface light source, and manufacture it into a shape. The product is made by combining spectral analysis principle with digital UV printing technology under constant temperature, humidity, and dust-free environmental conditions. It has distinctive characteristics such as ultra-thin, ultra bright, uniform light guide, energy saving, environmental protection, no dark areas, durability, not easy yellowing, and simple and fast installation and maintenance.
The key to LCD light guide panel lighting technology is the total reflection effect of light in PMMA. We know that light undergoes reflection and refraction when passing through two transparent media. When light is emitted from a transparent medium with a refractive index greater than air to air, due to the difference in refractive index, when the incident angle θ is greater than a certain angle, it will undergo total reflection at the interface and no longer emit light from the medium. In other words, the transmission loss of light inside the medium depends only on the absorption of light by the medium, and there is no loss when reflected at the interface (light usually loses 10% to 15% when reflected on a metal surface). PMMA light guide panel utilizes this characteristic.
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