本研究為將導光件拆為導光蓋與導光條，讓光運用全反射的原理限制在導光條內，不致於因導光件的各種固定及破孔結構造成能量的損失與消耗，並於導光條上運用V型結構與斜面結構，運用田口實驗方法將五種可控制因子及各5種水準做參數設計，並建構成一L25（55）直交表，用光學模擬軟體對25組模型進行模擬實驗並取得最佳的設計參數及分析，以得到最佳化設計。 實驗結果為將原始單件導光件修改為導光蓋與導光條2件式的設計後，其均勻度可由30.9％提升至52.1％，並經由田口實驗法取得最佳微結構參數後，可將均勻度在提升至59.4％，其均勻度明顯有效提升。 This study will be split light guide for the light guide cover and the light bar.Use of Taguchi method to five kinds of factors can be controlled and the five kinds of standards for parameter design and constructed as a L25（55）orthogonal table, with optical simulation software for 25 group model simulations and obtain the best design parameters and analysis in order to get the best design. The results of uniformity is improved by 30.9 percent to 52.1 percent, and by the Taguchi method to achieve the best micro-structural parameters, uniformity can be improved to 59.4%.
