The Optimal Limt Design for thin LGP Pattern Pringing of LED Backlight Module

• Main Authors: Tsang-Yu Wu, 吳倉有
• Other Authors: Jiung-Ming Huang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/09295118101262463270

碩士 === 國立勤益科技大學 === 研發科技與資訊管理研究所 === 100 === LCD monitors are mainly dependent on the backlight module (back light module, BLM) to produce good symmetrical brightness and image clarity. But to result in symmetrical brightness, it chiefly depends on the light guide plate to achieve the purpose. That is, for a LCD monitor, to develop high rightness, symmetrical light, low power consumption and thickness, and low-cost backlight module is extremely important. The manufacturing technology of light guide plates (LGP) is divided into injection, screen printing, flat hot pressing, roller hot rolling and laser processing, etc. For desktop monitors, injection and screen printing are the mainly process. Since desktop monitors are demanded increasingly, apparently LGP can not meet the capacity requirements by injection molding now. Therefore, turning to screen printing production is an inevitable trend. However, when the design value of network is too big, it will cause lacking of shadowing, but too small, it will be inferior in printing quality. This study is basically adopted to a backlight module manufactor for 21.5-inch desktop monitor with 2mm thickness of LGP. The optical design focuses on the parameters for the required luminance values, homogeneity by TRIZ Lenovo, which constructs optical design parameters and creating high stability of optimal printing process. In this study, we are adopting Taguchi L9 orthogonal table parameter configuration to set up LGP 3D geometric model and starting the optical design with various parameters of optical simulation analysis. Thirteen optical points are measured for luminance and uniformity measurements. By the analysis of S/N ratio, summing up all the factors, and levels of S/N ratio, calculating the factors impact the LGP luminance and uniformity parameters and the best combination of parameters. After that, we are taking Analysis of variance (ANOVA) to obtain the variation and contribution level by Response Surface Methodology (RSM). The findings of this study may provide the backlight module industry references to improve the LGP pattern printing limit optical design and amending. In addition, it also helps reduce work hours and cost of development and enhance the production, and gives full consideration of the customers' needs, and achieves a win-win-win situation.