Light diffusers are widely used in liquid crystal display, LED lighting and imaging display systems. Its main function is to fully diffuse the incident light to achieve a softer and more uniform illumination effect. The theoretical basis of the LED diffuser plate is that when light is emitted from one medium to a smooth interface of another medium, part of the light is reflected by the interface, and the other part of the light is refracted in the other medium through the interface. The angle of incidence of light is equal to the angle of reflection, and the reflected light and the incident light are on both sides of the normal in the same plane, which is the law of reflection. The refracted ray conforms to the law of refraction: the refracted ray lies in the plane of the incident light and the normal, the refracted light and the incident light are on both sides of the normal, and the ratio of the sine of the incident angle to the refracted angle is a constant. Both the law of refraction and the law of reflection are the basis of geometric optics. They not only lay the foundation for theoretical research, but also for the development of optical technology and the design of optical products.
The light guide plate is a fully radiating plate, the light enters from one end and basically all comes out from the other end. Therefore, the light source is on the side of the light guide plate. The LGP used in the LCD needs to destroy the total emission by printing dots, etc., so that the light of the side light source can overflow on the surface of the LGP. Of course, the damaged surface needs to have reflective paper for reflection. Therefore, in the LCD, the light source is on the side of the LGP, and the main light-emitting surface is on the LGP.
In terms of material: the base material of the LED panel light diffuser is PC, and the base material of the light guide plate is PMMA.
In terms of functionality: the main functions of the LED panel light diffuser are:
1: Disperse the luminous flux and distribute the light evenly (some composite diffusers can control the exit angle in addition to homogenizing the light).
2: Support the backlight structure to protect the underlying optical material from damage.
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