- 學位論文
區塊型背光模組應用於大尺寸LCD之研究
THE STUDY OF THE BACKLIGHT MODULE WITH SEGMENTED STRUCTURES FOR LARGE LCDs
摘要
本研究中，我們採用TracePro光學模擬軟體來分析與優化液晶顯示器(Liquid Crystal Display)中背光模組的導光柱反射器結構。首先，我們將設計之導光柱之參數做一模擬分析，其中我們以發光二極體(Light Emitting Diode)取代傳統的冷陰極螢光燈管CCFL(Cold Cathode Fluorescent Lamp)作為發光源。再把設計之導光柱與LED燈條和導光板組合成一簡單背光模組，最後經由這些結構來達到高亮度、高均勻度以及混光效果佳之背光模組。實驗結果顯示，當我們加入一片擴散片及二片增亮片時，此背光模組亮度可達2025 nits，均勻度為85%。 此外，我們還將導光板做另一結構設計，使之成為區塊型背光模組，此區塊型背光模組不但能做成大尺寸之背光模組，還能擁有個別補償單一區塊之特性，如亮度、色澤、溫度。
並列摘要
TracePro, a commercial light simulation software, was used to analyze a LED (light emitting diode) backlight module for liquid crystal display in order to improve the performance of brightness, uniformity and color mixing, and to realize color, brightness and temperature compensations segmentedly. First of all, we designed a compound cylindrical light reflector to deliver the light from the LED source to the PMMA (polymethylmetyacrylate) backlight module. A LED light bar was used as the light source instead of traditional CCFL (cold cathode fluorescent lamp). The backlight module we proposed consisted of a compound cylindrical reflector, a LED light bar and a PMMA light panel. Eventually, the results show that the structure we proposed can achieve high brightness, good uniformity of light distribution, and excellent performance of RGB color mixing. In our experiment, with a diffuser and two BEFs (brightness enhance film) the results show that the illumination is 2025 nits and the uniformity is 85%. Further more, the segmented structure of this LED backlight module possesses the facility of scale-up to large size by putting each elemental unit together. It can be scale up mit the requirement of large size backlight module for large size LCD easily, which has the advantage of being able to be compensated within each segment individually such as brightness, color and temperature.