Study on the optical performance of light guide plate with double-side micro feature design

• Main Authors: Li-Chi SU, 蘇莉琪
• Other Authors: Shia-Chung Chen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/50597089365602664518

碩士 === 中原大學 === 機械工程研究所 === 94 === Abstract In the liquid-crystal display, the light-guide plate (LGP) is a very important component in backlight module and controls the brightness and the uniformity. Micro-feature technology is applied to the integrated LGP in this research. CAE is a feasible way to use in the design, and the criterions for optical design of LGP can be investigated based on CAE results. With the aid of CAE, the design is more time and money saving, and the products quality can also be improved. The optical simulation software TarcePro was used in the design of the LGP to optimize the micro-feature, and the results were verified by the experiments. A PMMA-made light-guide plate with dimensions of 64mm × 45mm × 1mm was investigated in this research. The optics characteristics of various microstructure design in LGP were analyzed, and the optimum design was obtained based on simulation results. The mold cavity of optimum design was made, and parts were molded to measure the luminance and uniformity. Finally, the simulation results were verified by the experiment results. Investigation of the optical performance of LGP with micro-feature characteristics shows that LGP with micro-feature on double sides has higher luminance than one-side plate. Comparing with one-side LGP, one-side LGP combining with V-grooves can improve 50% of the brightness, and its combining with pyramids can improve 100% of the luminance. In double-side micro-feature design, the micro pyramids characteristics can get better luminance than micro prisms characteristics. The simulation results also reveal that the micro-feature with smaller interval of V-grooves on light guide plate will possess better luminance. In this study, the difference between simulations and experiments is about 8.36% near the light source and about 48.66% far away from the light source. The research results also indicate that different micro-feature design can achieve different luminance. The investigation provides a guideline of micro-feature design in LGP to researcher and designer.