| Summary: | 碩士 === 國立勤益科技大學 === 機械工程系 === 99 === Because of environmental consciousness, the backlight module, the most critical component of the liquid-crystal display (LCD), has been shifted its light source form CCFL into LED. LED has a pointed light shape gradually. This research makes use of the benefit and introduces “the diagonal placement of the LCD light source for the backlight module of LCD” in order to raise the energy efficiency. With our design, the LED’s are placed at the four corners of the backlight module. By adjusting the X-angle of the LED light sources and designing the dot patterns of the light guide, a well uniformity can be achieved, with the benefits of eliminating the dark areas and reducing the required number of LED’s.
Through market analysis, this research focuses the study on 7-inch, 16:9 backlight modules. Computer simulation was carried with the optical software, LightTools. The parameters of the X-angle of LED light source, the features of the dot patterns, and the density of the dot patterns were investigated to resolve the uniformity of the backlight module. The result shown that a luminance uniformity of 84 ~ 89% can be easily reached for the 7-inch, 16:9 backlight module. Meanwhile, the energy consumption has cut down 22% due to the reduction of the number of LCD’s.
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