LED backlight each component structure and principle
May 13, 2022
LED backlight manufacturing, from the acrylic resin to make light guide plate, and then in the light guide plate to make light scattering white dot pattern, and then attached reflection film sheet, diffusion sheet, prismatic film sheet and other optical film sheet, and assembly, after assembling LED light reflector, etc., assembly completed backlight.
LED SMD light backlight need to SMD light emitted light, in the light guide plate total reflection while propagating forward, the bottom of the light guide plate reflection point pattern has a regular change, the incident angle is less than the total reflection angle part of the light can be shot from the upper surface of the light guide plate, the line light source into a surface light source.
This kind of prism film top angle of 60-70 degrees, with diffusion film, with the lens of the light guide, reflective film and other combinations of use. For light beams emitted from the light guide plate at 65-70 degrees, the total reflection effect causes the light to be directed normal to the display. Compared with the refractive type light intensifier, fewer parts and materials are used, and because total reflection of light is utilized, the reflection loss and light absorption loss are smaller, making the light utilization rate higher.
The LED backlight reflective diaphragm is usually set at the bottom of the light guide and is used to make the light reflect towards the inside of the light guide to reduce the attenuation of the traveling light; while the reflective diaphragm located around the lamp is used to take out the light with high efficiency.
