What is LED backlight
Author:Zhang Shumei Time:2021-09-13 11:22 Browse(644)
LCD (liquid crystal screen) itself can not emit light, to be exact, it is shading. In order to display the restored image, it is necessary to use the background light source (backlight) to transmit the LCD screen to get the image.
LCD (liquid crystal screen) itself can not emit light, to be exact, it is shading. In order to display the restored image, we need to use the background light source (backlight) to transmit the LCD screen, so as to get the image.. The early backlight was CCFL (cold cathode fluorescent lamp). CCFL is mostly side backlight, that is, the light source is installed on one side or both sides of the LCD.. Nowadays, LED has gradually replaced CCFL for many advantages. There are two kinds of LED backlight: side backlight and bottom backlight. The bottom backlight has more advantages than the side backlight: better brightness uniformity, more concise optical components, etc.. The backlight LED of mobile phone display is usually placed LED light source at the edge of the screen, and the light guide plate is used to conduct the light to the bottom of the screen to form a luminous panel. However, this method is greatly affected by the angle between the light guide efficiency of the light guide material and the position of the LED, which is not conducive to the backlight of large area display equipment, and the brightness of different areas is obviously uneven, In order to solve the problem of large-area application, when used on TV, the LED is usually placed in the array behind the LCD, and the dynamic (according to the picture) needs to turn on and off the LED at different positions with appropriate brightness to cooperate with the picture display, so as to solve the problem that the LCD TV has been plagued by dragging because of the full reflection speed of the crystal, At present, white LED is generally used for such backlight applications. The display color will be affected by the LED color rendering index, and the picture color is not very real.

What is LED backlight

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