A Research On Improving The Roughness Stability Of Light Guide Plate Applying Six-Sigma

• Main Authors: Yu-Sheng Zheng, 鄭育昇
• Other Authors: Wen-Tsann Lin
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/81123021766631280610

碩士 === 國立勤益科技大學 === 研發科技與資訊管理研究所 === 100 === The technology of Liquid Crystal Display (LCD) improves. How to use the outstanding technologies and stable qualities to satisfy the diverse market demand is the challenges confronted by the LCD makers. The research takes 46” LED TV as example, to examine the effect of the surface roughness of back light module optical component-Light Guide Plate on lighting transmission on the picture. In this research, we apply Six-Sigma and TRIZ parameters to explore the main factors affecting the surface roughness on light guide plate (LGP). And, also, Taguchi Method was applied to conduct the factor experiment. The study finds that CNC Spindle speed、Cutting feed rate and cutting amount are the essential factors to reach good quality. The results indicate that the parameters controling CNC processing and LGP surface reach the level of Mirror-polished. And the LGP roughness Cpk improves from 0.57 to 1.73, which matches the stabilized process of Cpk above 1.33. Except for using CNC processing to examine the surface roughness, the study applies Multi Process Capability Analysis to confirm that the LGP five processing abilities reach the level Cpk above 1.33, then conducts the LGP manufacture of back light module by new parameters, and the back light module test reveals that the optical uniformity improves from 73.3% to 83.1%, which satisfies customers’ design objective. The results ot this research indicate that improvement of LGP pre-processing ability has the will improve lighting-side surface roughness and handling of size precision. The results overcome the problems of uniformity insufficient and decrease the optical difference of back light module.