在液晶電視和以冷陰極燈管為光源的直下式背光模組結構中，我們發現背板的重量占在背光模組、液晶模組與電視機的比率各約為61%、45%和20%。另外在直下式背光模組中，燈管與接地的背板間因距離太近，而產生漏電流效應，造成其輝度均齊性較差。 我們打破其現行的結構，將有重複功能的組件做一次探討與分析。在新型37"與新型42"中，取消背光模組之背板，其功能則由其它組件代替，並改變組裝方式。新型37"為了擴大減重效果，並將前框左右部分組件取消和使用塑膠組合腳座。 在設計新型的液晶電視與背光模組中，因取消背板而有結構弱化，對於新結構是否可符合衝擊、壁掛吊重等測試，則使用LS-DYNA有限元素軟體來模擬和搭配經驗值來分析。在整機PRO-E 3D設計完成時，並製作模型來進行組裝與實物測試驗證。 本研究共設計與製造出新型37"與新型42"兩款液晶電視模型，其在重量上約比一般市售同尺寸機種輕39.6% 和44%；在厚度上約薄31.7% 和24.7%；在輝度均齊性亦有1.1%和1.8%的提升，為本文最大成果。 The main objects in this paper are the structure of LCD TV set and direct backlight module with CCFL light source. The weight ratio of backbezel is about 61%, 45% and 20% in backlight module / LCM / TV set respectively. The distance from lamp to grounded backbezel in a direct backlight module is too close so that a leakage current is not avoidable. Therefore, the uniformity of brightness is bad in this conventional backlight module. We discuss and review the current structure and focus on parts which have similar functions. We remove the parts which have similar functions and replace it with different parts such as the backbezel in new structures of 37"/42" LCD TV sets.The conventional assembly way has to change because of the removed parts. We also remove the right and left side of the frontbezel and design a new plastic stand to make the new structure of 37" lighter. In this process of designing TV set and backlight module with new structure, we use LS-DYNA software to simulate the new structure strength for shock and wall mount test requirement and collect unknown data. After the 3D model is finished in Pro-E, we have to make mockup samples for active tests. In this research, we design new structures of 37"/42" LCD TV sets. The weight of these TV sets has 39.6 % and 44 % lighter and the thickness of them has 31.6 % and 24.7 % thinner than the current models on the market respectively. The uniformity of brightness also has 1.1% and 1.8% higher than the original.
