發光二極體背光模組增亮片設計

Brightness enhancement film design for LED backlight module

許炯章(Jyong-Jhong Syu)

指導教授 ： 林世穆

國立臺北科技大學/機電學院/光電工程系所/碩士(2006年)

摘要

由於液晶分子本身不發光，必須由背光模組提供光源才能顯示影像。在液晶螢幕中背光模組為僅次於彩色濾光片之第二大關鍵零組件，而小尺寸背光模組中又以導光板、稜鏡片對背光板的性能起了決定性作用。
本論文利用光學模擬軟體設計12吋導光板與稜鏡片，光源採用四十五顆0.066瓦特白光發光二極體以側光式並列於導光板的側邊。導光板設計的部分採用在導光板下表面以凸點處理的方式，先以均一性散射圓點，再逐步以變化散射圓點曲率半徑的方式達到照度均勻的目的。以往的背光模組必須再配合一擴散片才能達到正向光加強的目的。本論文省去了擴散片的組合，採用上述設計好的導光板，於其上建構一基本型稜鏡片。變化稜鏡片上微稜鏡結構的形狀，達到廣視角的目的。

關鍵字

背光模組 ； 液晶顯示器 ； 發光二極體

並列摘要

Because liquid crystal molecule does not give out light, it will not show the image unless being offered the light source by backlight module. Backlight module is the second largest key spare part which less important only to color filter in the screen of the liquid crystal. The light guide and BEF in small size backlight module plays a decisive role to the performance of the board.
An optics imitating software is used to design the twelve inches light guide and BEF. The light source are 45 pics 0.006-watt high power of white light LED, standing by side of light guide. The design of light guide is a bit protruding under the surface under the light guide, firstly one scattering dot, and then achieving the purpose even in intensity of illumination by way of changing the radius of dot camber of the scattering progressively. In the past, backlight module could not achieve the goal strengthening to the light unless cooperate with one more diffuser. This thesis does not use diffuser, but adopting above-mentioned designed light guide¸ and constructs one basic model on it. And then the form of the structure of the micro prism structure on BEF is changed, in order to the purpose of strengthening the normal incident light and bordering the visual angle.

並列關鍵字

backlight module ； liquid crystal display ； light emitting diode

參考文獻

[6] D. M. Brown, “LED backlight design fabrication and testing,” Proc. SPIE, vol. 3938, 2000.

[7] E. Nihei, “High-performance LCD backlight using a highly scattering optical transmission polymer,” Proc. SPIE, vol. 3281, 1998.

[14] J. B. Eichenlaub, “Lightweight, compact 2D/3D autostereoscopic LCD backlight for games, monitor, and notebook applications,” Proc. SPIE, vol. 3012, 1997.

[16] J. L. Lindsey, “Applied illumination engineering,” Prentice-Hall, 1991.

[18] D. C. O’Shea, “Elements of Modern Optical Design,” Wiley, 1985.