The Optimization of Optical Design for LCD Backlight Module

• Main Authors: Yu-Bin fang, 方育斌
• Other Authors: Chi-Chuan Hwang
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/64hkhc

碩士 === 國立成功大學 === 工程科學系碩博士班 === 92 === 　　Liquid crystal displays have a lot of excellences, such as thin thickness, slight weight and high brightness, etc. It is so important subject that developing the high brightness, uniformity, low power consumption and thin backlight module. In backlight module, light guide plate (LGP) is a key-component of lower cost and easier self-development. Therefore, we emphasize dot pattern of LGP in this thesis. 　　Much simulation software can solve actual problems due to development of computer science. For example, optical software designs and analyses backlight module. If we learn how to design the LGP by optical software, we can economize unnecessary try-and-error times and the waste of cost. 　　In this thesis, we develop a design procedure of optimization by ASAP optical simulation software. First, we divide LGP into several blocks, and adjust the Dot density ratio of each block by employing the false position method. It purposes to achieve the flux of each block to the initial range. Second, we fit these flux of each block and its position to a curve function. Then we divide curve function into more parts and use the dot density ratio of parts on smaller blocks. Last, the program executes automatic adjustment to get the average luminance distribution. We apply this procedure to 15 inches side type backlight with a CCFL light source and 1.8 inches LEDs backlight. The result shows that over 90% uniformity is achieved.