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An analysis of the LCD backlight module

LCD products are a non-active light-emitting electronic devices, itself does not have light-emitting characteristics, must rely on the backlight module in the light source emission to obtain display performance, so the LCD brightness to be determined by its backlight module. It can be seen that the performance of the backlight module directly affects the display quality of the LCD panel.

Backlight module includes lighting source, reflector, light guide, diffuser, brightening film (prism sheet) and frame, etc. The backlight module used in LCD can be mainly divided into two categories: sidelight backlight module and direct backlight module. Cell phones, notebook computers and monitors (15 inches) mainly use sidelight backlight module, while most LCD TVs use direct backlight module light source. Backlight module light source, mainly cold cathode fluorescent lamps (ColdCathodeFluorescentLamp, CCFL) and light-emitting diode (LED) light source for the LCD backlight.

ReflectorSheet is also called reflector cover, the main role is to send the light emitted from the light source completely into the light guide plate, as far as possible to reduce the unhelpful loss.

  The main role of the light guide plate (LightGuidePlate) is to direct the light emitted from the side light source to the front of the panel.

  PrismFilm, also known as BrightnessEnhancementFilm, has the main role of refracting and reflecting the scattered light through the film layer and focusing it at a certain angle before it is emitted from the backlight source, which has the effect of brightening the screen.

  Diffuser (Diffuser) is mainly used to correct the backlight module’s side-light type light into a uniform surface light source, in order to achieve the effect of optical diffusion. Diffuser has upper diffuser and lower diffuser. The upper diffuser, which is between the prism sheet and the LCD module, is closer to the display panel. The lower diffuser is between the light guide and the prism, which is closer to the backlight.

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