[[alternative]]Design of Large-Scale LCD Backlight Modules Using Taguchi’s Method

碩士電機工程學系[[abstract]]本論文主要應用田口法設計一個大尺寸液晶顯示器（LCD）之背光模組，其照射方式係採直下式，並以市售的白光發光二極體（LED）作為背光光源以取代傳統冷陰極螢光燈管（CCFL），且利用Trace Pro光學模擬軟體，進行光源模擬及背光模組之建構。本研究方法的優點為有效縮短產品研發時間與降低錯誤產生並節省研發成本；此外應用田口實驗法尋找出背光模組的最佳參數組合，如反射罩之形狀、LED左右間距、LED上下間距、微結構導光孔之半徑、底邊間距、微結構外圍半徑等，因此可同時兼顧背光模組之效率與性能，進而達到高均勻性與高輝度的亮度分佈。由模擬結果顯示，應用此方法於30吋的背光模組並採直下式方式照射，背光模組的出光效率約為71.36％而亮度之均勻度可達90.34％。[[abstract]]This thesis applies Taguchi’s Method to design a large-scale liquid crystal display （LCD）backlight-module. The design approach is a type of straight direct-illumination, and the light source of the backlight module is a white light mixed by marketed white light-emitting diodes （LEDs）to substitute traditional CCFLs. Also, the light source modulation and the mold-up of the backlight module are carried out by using the TracePro optical simulation software. This study can effectively reduce the time and mistakes during the research and development process so that the cost of the research and development can be saved. In addition, the parameters of the backlight module, such as the shape and the reflectance of covers, the placement manner of LEDs, the radius of the light-guide hole of the microstructure upon the LED, the spacing on the bottom side, and the outward radius of the microstructure, can be optimized by using Taguchi’s method that both the efficiency and the performance of the module can be regarded, simultaneously, and the luminance distribution with high uniformity and high brightness can be achieved. The simulation result shows that the uniformity of 90.34% with an optical efficiency of 71.36% can be obtained by employing this method to a size of 30-inch direct LED backlight module