LCD Encyclopedia

Differences Between Side-type And Straight Down Type of LCD backlight Source

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Author : China lcd supplier
Update time : 2019-09-19 17:54:21
The backlight of lcd display screen is mainly led, side-type LED backlight and straight down LED backlight. What is the difference between these two kinds of backlight?

The side-type backlight is a backlight made by setting the linear or point light source on the side of the specially designed light guide plate. The principle of light guide plate is that the interference phenomenon of destroying light is caused by the dot distribution at the bottom of light guide acrylic board, and the line light source is uniformly converted into surface light source, and its function is to guide the scattering direction of light. Make the distribution of light more uniform so that the shadow of the reflection point can not be seen from the front, and ensure the uniformity of the brightness of the LCD screen. The side-in backlight can be very thin, but the light utilization of the backlight is smaller, and the thinner the utilization is, the smaller the utilization is. The core of the technology is the design and manufacture of the light guide plate, laser management, suitable for the principle of mass production. At present, LCD products require a more meticulous light guide plate structure, and the injection shaped light guide plate is bound to become the mainstream of the development of backlight source. Side guided LED backlight can adapt to the development trend of ultra-thin liquid crystal display screen.

Straight down LED backlight performance is better, do not need light guide plate, is to put the light source and PCB at the bottom of the backlight source, light from the LED, through the bottom of the reflector, and then through the surface of the diffusion plate, brightening film evenly. The thickness of the backlight is mainly determined by the height of the cavity between the reflective film and the scattering plate. Theoretically, on the premise of meeting the installation requirements and luminous brightness, the larger the cavity height is, the better the uniformity of light emitted from the scattering plate is.
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