Optical Design and Applications of Assemblable Led Light Guide Bars for Indication and Illumination Lights

[[abstract]]本計畫將研究組合式導光元件的光學設計與應用，設計如同樂高積木可拼接式導 光單元，應用於指示照明的設計。LED 主要已成為照明與指示燈源，在平面顯示裝置、 標誌與儀器燈號的應用已非常成熟，但現有應用多將 LED 直下式排列封裝成現有燈具 外型，雖具有高亮度與節能的優點，但有均勻性不足、炫光與 LED 數量太多的問題。 LED 側光導光技術在平版導光方面已經相當成熟，若要應用到照明設計，則需考量造型 變化成曲面時的光學設計，如何能達成均勻導光與出光成為側光導光條的設計重點。部 分照明與顯示導光元件之尺寸較為龐大、複雜，在生產上容易產生干涉、不易生產等問 題，如何能夠設計出一易於生產且有著高通用性、高均勻導光與出光的導光元件成為普 導光照明普及化的設計重點。本年度計畫以一維延伸單元設計為目標，設計出包括直線 導光單元、平面彎曲導光單元、垂直彎曲導光單元等，著重於組合式導光元件的光學設 計並將其設計應用於產品上，包括車用指示燈/晝行燈與室內情境照明燈具，來驗證此設 計方法的可行性。在建模時以 Pro_E 繪圖軟體建構組合式導光元件及微特徵，而使用光 學模擬軟體 TracePro 與 LightTool 做為光學特性分析工具，探討組合式導光元件之出光 情形，並研究均勻出光之最佳化架構，最後將利用表面粗糙度作為出光擴散面參數應用 於設計驗證載具如車用晝行燈條與室內情境照明燈具等。[[abstract]]This project investigates optical design and applications of assemblable LED light guide bars for indication and illumination lights. LEDs have become the main stream of illumination light sources due to the advantages of long life, low power consumption, and small size. LEDs have been widely applied to the LCD displays, consumer products, and instrument signals. However, the designs are mostly of direct backlight module which uses array LEDs with diffusive films above. The applications of direct types LED array to lighting devices often cause problems such as low uniformity, glaring light, and too many LEDs required. Edge-lit light guide plates have been widely used in the back light model of LCD, and the related research topic have also been extensively explored. The geometry of the lighting devices in the automotive lighting is often curved. Uniform illumination and density distribution become key factors to curved light guide devices. Long light guide often encounter manufacturing and difficulties and light distribution problem at the middle section. The project will focus on linearly extendable light guide bars include straight section, planar curve section, and transverse curve section. Each light guide building block has independent LED light source and socket design for optical and electrical connection. This research applies the optical simulation software, TracePro to simulate optical characteristics of a light bar with various light guide features and the related geometric parameters to achieve an optimum design. A Fuzzy optimization scheme is applied to vary the feature density along the light bar. The relationship between the surface roughness and the optical diffusive properties will be investing for the dissuasive cover design of the assembled light guide to improve illuminating uniformity and geometric variation. The proposed modules will be applied to the design of automotive day driving light and domestic decorating lighting to demonstrate the feasibility of the design.[[note]]MOST103-2221-E327-01