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Diffusion Principle Of Diffuser Plate that for LED TV Backlight


To understand the diffusion principle of the diffuser, you must first know two principles, one is the principle of reflection and the other is the principle of refraction. Then the reflection principle is: when light is emitted from one medium to the smooth interface of another medium, part of the light is reflected by the interface, and the other part of the light is refracted in another medium through the interface. The incident angle of the light is equal to the reflection angle, and the reflected light and the incident light are on both sides of the normal in the same plane. The principle of refraction is: the refracted light 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 incident angle to the sine of the refraction angle is a constant.

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 Then the principle of the diffuser is to use chemical or physical means to use the physical phenomena of refraction, reflection and scattering when light encounters two media with different refractive indexes on the way. Through the use of PMMA, PC, PS, PP, etc. Inorganic or organic light diffusing agent is added to the base of the substrate, or the light is artificially adjusted through the array of microfeatures on the surface of the substrate, so that the light is refracted, reflected, and scattered in different directions, thereby changing the path of light and achieving incidence The light is sufficiently dispersed to produce the effect of optical diffusion.

Light diffusion plates are widely used in liquid crystal displays, LED lighting and imaging display systems.

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