LCD module side - in backlight and straight - down backlight difference

What is the side entry LED backlight for LCD display modules?  

Side-entry backlight is made by placing a line or point light source on one side of a specially designed light guide plate.  The principle of the light guide plate is the light guide acrylic bottom dot distribution caused by the destruction of light interference phenomenon, the line light source evenly converted to surface light source, its role is to guide the light scattering direction, make the light distribution more uniform, from the front can not see the shadow of the reflection point, to ensure the uniformity of the brightness of the liquid crystal module.  The side-entry backlight can be very thin, but the light utilization of the backlight is low, and the thinner the utilization, the lower the utilization.  

What is the straight down LED backlight of LCD?  

The straight down LED backlight performs better, eliminating the need for a light guide plate, where the light source and PCB are placed at the bottom of the backlight. The light is emitted from the LED, across the bottom of the reflector, and across the surface of the diffuser plate, allowing the film to glow evenly.  The thickness of the backlight is mainly determined by the height of the cavity between the reflection film and the scattering plate.  Theoretically, the higher the cavity height is, the better the light uniformity of the scattering plate is under the premise of meeting the installation requirements and luminance.  

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