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背光源是透射式显示器不可缺少的重要光学器件,随着液晶显示器向大屏幕、易读性、全色化方向的发展,背光源在其显示中的作用越来越受到重视。但背光源的存在影响了液晶显示器的薄型,低功耗等优点。因而对背光源的要求越来越高。本文较系统地阐述了液晶显示器对背光源的性能要求、对背光源的选择及光源的放置方式,探讨了一些显示特性（亮度、功耗、颜色的协调性、透射光的指向性、对比度等）存在的有关问题,并介绍了背光源的最新发展。
Backlight is an indispensable transmissive display of important optical devices, with the LCD screen to the big screen, readability, panchromatic direction, the backlight in the display of its role more and more attention. However, the existence of the backlight has affected the LCD thin, low power consumption and other advantages. Therefore, the backlight requirements are getting higher and higher. This article systematically expounds the LCD backlight performance requirements, the choice of backlight and light source placement, discusses some of the display characteristics (brightness, power consumption, color coordination, transmission of light directivity, contrast, etc. ) Related problems, and introduced the latest development of the backlight.