3.Diffusion plate The main function of the chirped diff […]
The main function of the chirped diffuser plate is to uniformly guide the light from the light guide plate to make the light distribution more uniform. When the light hits the diffusion point, the reflected light will diffuse to various angles, and then it will be emitted from the front of the light guide plate. The light guide plate is made to emit light uniformly by using various dense and diffusive diffusion points to improve the brightness of the light guide plate. Can also play a role in fuzzy outlets. The diffusion plate generally uses acrylic 2.0 sheet or PC material, and the PS material is almost the same. Acrylic has lower cost, slightly higher light transmittance than PC, and weak anti-aging performance; PC is slightly more expensive, but has strong anti-aging performance. After the diffuser plate is installed, the dots cannot be seen, and the light transmittance should be about 90%. The acrylic light transmittance is 92%, the PC is about 90%, and the PS is about 88%. Manufacturers can choose the material of the diffusion plate according to demand. At present, most manufacturers use acrylic materials.
The role of the reflective paper is to fully reflect the light overflowing under the light guide plate, so that the light emitted by the LED is fully utilized. Use reflective paper with a reflectivity close to 100% as much as possible to maximize its light utilization and improve the output brightness of the LED flat lamp. Generally For RW250.
5, rear cover
The main function is to seal the LED flat lamp, generally using aluminum plate, and also can play a role in heat dissipation.
At present, there are two types of LED drive power. One is to use a constant current power supply. This mode has high efficiency, a PF value of 0.95, and a high cost performance. The second is the use of a constant voltage with constant current power supply, which has stable performance, but low efficiency and high cost. It is generally used. This power supply is mainly for export, and the other party has certification requirements. In fact, it is safe to use a constant current power supply in the home, because users are difficult to access the power supply, and the lamp body itself uses a safe low voltage.