Analysis of the LED Backlight Unit with a DiffusiveLight Guide Plate

• Main Authors: Ying Li Wang, 王英力
• Other Authors: 林晃巖
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/43951929442933464370

碩士 === 臺灣大學 === 光電工程學研究所 === 95 === As the information technology progresses, the display technology always plays an important role. In recent years, the CRT monitor has been substituted by TFT-LCD gradually and flat panel displays have become the main stream products already. In this thesis, we design a simulation model of edge-lit diffusive type backlight system. Unlike the conventional backlight system, the diffusive type backlight system contains no enhancement film or diffusive film. The micro-particles blended in the light guide plate and the micro-structures on the bottom surface will affect the propagation of light path to vertical direction and enhance the lighting efficiency. Besides many countries and organizations in the world pay attention to the environmental subject, the backlight system constructs of LED becomes more and more popular. The LED backlight has advantages of higher color saturation, faster response time, free of mercury, long life-time, etc. We make use of a suit of commercial software LightToolsTM to model a folding type of LED backlight system and to analyze the uniformity, optical efficiency, and color dispersion of the system. Based on our design, the uniformity of our backlight modules can be adjusted to achieve 93.1% or above. The color dispersion of these modules is quite acceptable. The optical efficiency of the backlight module without using BEF and optical diffuser film can be raised to 76% better than that of conventional backlight module.