背光模組之導光板微結構與指向性光源設計

The Property between Microstructure of Light Guide Plate and Directional Light Source in Back Light Module

陳玠文(Jie-Wen Chen)

指導教授 ： 李金連

國立臺北科技大學/電資學院/光電工程系研究所/碩士(2014年)

摘要

本論文研究目的為設計一個可提供指向性光源給垂直電場驅動的藍相液晶顯示器使用的側光式背光模組。應用創新發明問題解決方法理論分析現有背光模組結構，利用工程參數與矛盾矩陣找出符合需求的設計方法。研究藉由TracePro光學模擬軟體來進行背光模組設計，並搭配TechWiz液晶模擬軟體將背光模組與藍相液晶結合，進行顯示器功能之驗證。
研究共分兩部分，第一部分為2.8吋背光模組設計，利用加入稜鏡片的方式產生指向性光源。將稜鏡片V型微結構頂角設為變動參數，觀察參數與出光角度的關係，取參數最佳結果與藍相液晶層結合驗證顯示器功能。第一部份模擬結果可知，此一指向性光源背光模組具備提供藍相液晶光源之功能。第二部份將2.8吋模組擴增至5吋並省略稜鏡片及導光板上層微結構，僅利用導光板下層微結構產生單一出光角度之指向性光源。藉由創新發明問題解決方法理論找出的改變元件體積和漸少元件可能造成的影響，根據對應之理論工程參數從矛盾矩陣中找到解決問題的建議，依建議本部分將導光板底部微結構的分佈設為變動參數，進行設計、模擬與驗證。
結果顯示，2.8吋指向性光源背光模組，其出光面均齊度為78%，最大對比度為2319:1。5吋指向性光源背光模組，其出光面均齊度為71.55%，最大對比度為1163:1。本研究成功應用創新發明問題解決方法理論，有效減少背光模組元件，使導光板僅利用底部微結構便可產生均勻面光源及指向性光源。此設計方法與創新步驟，可節省背光模組開發人員在進行系統創新時的時間，並使企業有效降低成本，提高利潤。

關鍵字

背光模組 ； 導光板 ； 指向性光源 ； 微結構

並列摘要

The purpose of this thesis is a new type backlight module of edge lighting which has directional light source for a vertical-field-switching blue phase liquid crystal display. We apply the theory of inventive problem solving to analyze backlight module structure then using parameters and the suggestions which comes from the theory to figure out the best design. We simulated the backlight system by optical software, TracePro, and demonstrated the performance of display by liquid crystal software, TechWiz.
This research has two parts, first one is the 2.8 inch backlight module design which utilizes prism film to produce directional light source. We the vertex angle of the microstructures at light guide plate is variable parameter, and this parameter can control the incident angle for liquid crystal layer. The best result shows that this backlight module has the performance of display. Second, we enlarge 2.8 inch backlight module to 5 inch and remove some elements including the prism film and the microstructure on top surface of the light guide plate. We produce directional light source only use the microstructure on bottom surface of the light guide plate. According to theory of inventive problem solving suggestions, we set the microstructure distribution of light guide plate as variable parameter to design, simulation, and demonstration.
Simulation results show the uniformity of 2.8 inch backlight module is 78% and the the contrast ratio is 2,319. The uniformity of 5 inch backlight module reaches 67% and the maximum value of the contrast ratio is 1,163. This backlight module could be applying in the vertical-field-switching blue phase liquid crystal display. The systematized procedure can help engineer to find the concept for innovation and company to reduce costs then increase profits.

並列關鍵字

Back light module ； Light guide plate ； Directional light source ； Microstructure

參考文獻

[30] King-Lien Lee and Kuan-Yu Yang, “The Micro-structure and It's Arranging Rules under the Influence of the Brightness and Uniformity in Light Guide Plate of a LED Backlight Module,” Journal of National Taipei University of Technology, vol. 42, 2009, pp. 37-51.

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