本論文將針對大尺寸液晶顯示器之直下式背光模組的均勻度與指向性進行設計和評估分析。第一部分將討論數個改善直下式背光模組均勻度之專利結構，首先將分析每個結構之設計原理，接下來討論其結構之構成參數將其設為變異數，並以光學模擬軟體模擬與分析各結構參數與均勻度之關係，最後比較此數個結構之均勻度差異。第二部分將討論於直下式背光模組中使用一線型Fresnel Lens，評估其改善均勻度之效果，初步即可獲得81.87%之均勻度，再經適當地設計線型Fresnel Lens結構後可以得到83.72之均勻度，且於面板正向上之出光強度可以獲得顯著之提升 (在15o 內約佔 55% 光強度)。

The purpose of this thesis is to study the designs of large-scale LCD back light modules (BLM), and the factors determining the BLM performance of uniformity and directionality. First, a few published patents of BLM were simulated, studied, optimized and compared with some certain fixed parameters, such as the dimensions of LCD, the number of applied light sources CCFL and the arrangement of CCFLs. Furthermore, under the same circumstance, we designed a BLM using aligned linear Fresnel lenses and a flat bottom mirror, and an uniformity of 81.87% was achieved. After optimization, the performance of 83.72% uniformity and excellent directionality of 55% intensity within 15o were achieved, outperforming the previous designs of the patents.

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