LED Edge-Type Backlight Unit With No Light-Guide Plate

• Main Authors: Shao-Tun Chung, 鍾紹敦
• Other Authors: Chih-Chieh Kang
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/61105800767624914114

碩士 === 南台科技大學 === 電機工程系 === 97 === Abstract In the market trend of lightness, thinness and environmental protection, LED backlight units (BLUs) have a competitive edge over CCFL ones since LEDs offer the advantages of energy saving, free of mercury, longer life, etc. As the size and thickness of a BLU becomes larger and thinner, respectively, the design of the indispensable components of an edge-type LED BLU―light-guide plate (LGP) also become more challenging and its manufacturing processes become more difficult. To tackle this issue, we study edge-type LED BLUs with no LGP for the use of large-size TFT-LCD displays. The original design concept of edge-type LED BLUs with no LGP is based on the redistribution of light rays after their emission from LEDs. This has led to the study of the light intensity profile of various LEDs and especially the effectiveness of implementation of light modulation components in this work. Due to its ineffectiveness of light modulation component, an innovative structure is proposed: a highly directional LED is used and with no light modulation component. The simulation results have incontestably demonstrated the validity of our devised structure and its use in BLUs in terms of light extraction efficiency as well as luminance uniformity. But thorough investigations are still needed in order to explore the devised structure’s another important application: lighting.