- 學位論文
楔型導光板微結構設計之模擬分析
A Simulation Analysis of Wedge-shaped Light Guide Plate Micro-structure Design.
摘要
液晶顯示器(LCD)產品已朝向薄型化、高亮度要求的趨勢發展，其內部背光模組(backlight module)之發光源逐漸被發光二極體(LED)所取代。在導光板的入射光側安裝數個LED光源，光源散射後會有一定的擴散角度，將在彼此LED光源交界處會產生暗區(dark areas)，造成入光側的亮度不均，即所謂車頭燈現象(head lamp phenomenon)。 本論文將以11.6吋楔型導光板(wedge-shaped light guide plate)透過Light Tools光學軟體進行模擬分析，於入光側參數設定為1組無微結構，2組V-cut微結構，以及3組R-cut微結構，由照度分析圖觀察各種微結構設計中，藉此比較何種設計方式對於降低車頭燈現象有較佳之效果，最後再以此微結構參數製作導光板模具來驗證，並將其導光板投入光源後，與光學模擬之結果互相對照，觀察降低車頭燈現象的情況，最後希望能透過光學模擬來改善試誤法的開發流程，縮短其耗費的成本及時間。 結果顯示，R-cut_1與其他5組的微結構的對照下，其降低車頭燈現象的效果較佳，且入光側的照度相對較高，在R-cut微結構中的R值愈大，擴散角度愈大，產生暗區也就愈小。
並列摘要
The trend of thin and high-brightness LCD product is deleoped. The light emitting diode (LED) gradually replaces the backlight module of shiner source. Many LED shiner sources were installed at the incidence light side of the light guide plate. The source of light has a spread angle after scattering. The intersecting points between the LED lights will create the dark areas. It causes a heterogeneous brightness at the side of incidence light, called head lamp phenomenon. This paper is to study the simulation of the 11.6 inches wedge-shaped light guide plate through Light Tools software. Two types of micro structures including V-cut and R-cut are set up at the incidence light side, each type has three dimensions. Comparing the brightness of heterogeneous between each micro structure, we hope to obtain the reduction of head lamps phenomena. Moreover, we also hope to reduce the research and development cost and time through the optical simulation. Results show that the head lamps phenomena of R-cut structure is unobvious than the structure of V-cut, i.e. R-cut structure has more homogeneous brightness. The larger the radius of R-cut, the larger spread angles and smaller dark areas obtain.