| Summary: | 碩士 === 國立高雄第一科技大學 === 機械與自動化工程系碩士班 === 105 === Light guide plates (LGPs) are often crutial components in the backlight module of liquid crystal display. Because of its uniformity and low glare characteristics, LGPs become popular in the lighting applications in recent years. However, most LGPs adopt a flat panel design. This study addresses the optical design of curved light guide plate of illuminative uniformity, which grealy increases the possibility for aesthetic and innovative product design for the illumination applications using, various arc-shaped LGPs. The design and the distribution of the coupling feature and the influence of the LGP curvature to the optical design are the major issues in this study. The geometrical design of the microfeature will determine the light distribution curve, and the feature distribution will influence illumination uniformity. The curved LGPs studied in the thesis includes a single arc and multiple-arc deisgn of LGPs. The LEDs are arranged on the short edges of LGPs to prevent possible glare problems. The v-cut with the vertex angle of 80˚ is selected due to a peak intensity at the axial direction. The pitch of v-cut is fixed at 2 (mm) and the size of the v-cut is varied to obtain the illumination uniformity. Because there is no diect relationship between the regional v-cut distribution and the local illumination intensity on the observation surface for curved LGPs, this study applies a surrogate optimization using Kriging model to obtain the size distribution of v-cuts for illumination uniformity. The optical design of three curved LGPs including a single arc, a three-arc, and a multiple-arc types have been proposed, which can be applied to the desk lamps with a smiling, a dished, and a waved shape design. A prototype of a smiling desk lamp is fabricated and the optical performance is measured to compare with a commercial product to verify the superiority and feasibility of the proposed design.
|
|---|
