Diffusion plate knowledge

The biggest feature of the diffuser is that it interferes a lot with light. No matter how much the original design has a light distribution curve, as long as the light passes through the diffuser, it will make the beam angle 160~176°, so from the side, the light fixture The surface of the board has a layer of fog and fog. From this point, it can be proved that the beam angle is as large as 160~176°. It is better to prove that the larger the beam angle, the lower the illumination, and some will also filter, so that some wavelengths cannot penetrate. , causing color shift, such as re-interference processing on the surface (for example: sanding, embossing), the light transmittance is lower due to the natural phenomenon of geometric optics, so the substrate used to make the diffusing plate should use the refractive index The lower the better, the lower the interference with light.

Principle of diffusion

Theoretical basis: When light strikes a smooth interface from one medium to another, part of the light is reflected by the interface, and another part of the light is refracted through the interface in the other medium. The angle of incidence of light is equal to the angle of reflection, and the reflected light is on either side of the normal in the same plane as the incident light. This is the law of reflection. The refracted light conforms to the law of refraction: the refracted ray is 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 angle of refraction 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.

A light diffusing plate is a physical phenomenon of refraction, reflection, and scattering when a medium having a different refractive index is encountered by a chemical or physical means by using a medium in a path of PMMA, PC, PS, PP, etc. The inorganic or organic light diffusing agent is added to the foundation, or the array of micro-features on the surface of the substrate is arranged to artificially adjust the light, and the light is refracted, reflected, and scattered in different directions, thereby changing the traveling path of the light and achieving sufficient incident light. The color dispersion is used to produce optical diffusion effects, and the light diffusion plate is widely used in liquid crystal display, LED illumination, and imaging display systems.