基因演算法於RGB LED背光模組最佳化設計

本論文提出了一種擁有雙三角反射結構的直下式液晶螢幕背光模組，並希望減少使用任何光學元件而能達到背光模組系統所需之光學表現，藉由控制側射式紅、綠、藍三色發光二極體之光線，達到背光模組出光面有良好的輝度以及色彩均勻度。由於發光二極體為點光源，因此運用在直下式背光模組時必須以陣列的方式來配置，來達到面光源的效果。然而發光二極體的種類、排列的方式、背光模組光箱的厚度與結構等因素會直接影響到液晶顯示器觀測面的輝度均勻度，所以在背光模組系統中仍需各種的光學元件，如反射板、擴散板、增光片及反射式偏光增光片等來控制其系統之光學表現。在本論文中，採用基因演算法來設計雙三角反射結構的最佳尺寸參數以及紅、綠、藍三色發光二極體的最佳擺放位置。經過模擬之後，輝度均勻度可達93.44%，為了驗證模擬之準確度，我們實做了小尺寸背光模型單位(120mm×135mm×30mm)，經過BM-7量測之後，輝度均勻度達到了85.61%，經過計算後所得到的色彩均勻度為0.021。

關鍵字

背光模組； LED ；基因演算法

並列摘要

A large size direct LED BLU consisted of double-triangular structures was proposed in the paper to reduce the cost of LCD backlight unit (BLU) and raise efficiency without any optical component. We used the double-triangular structures to control the light from red, green and blue side emitting LEDs to improve brightness uniformity and color uniformity in the out-light surface of backlight unit. Because Light Emitting Diode has a characteristic of the point light, when used in the direct Light Emitting Diode backlight unit they must put by way of array to get the result of the area light. Furthermore, there are some factors, such as the kind of Light Emitting Diode, way to arrange, the thickness of the cavity of the backlight unit, the structure of the cavity and so forth, will influence intensity the uniformity of the observation surface of the liquid crystal display. So the backlight units still take various optical components in the system such as Reflector, Diffuser, Brightness Enhancement Film, and Dual Brightness Enhancement Film to control optics behavior. A genetic algorithm was used in this paper to search the optimal parameters of the shape of the double-triangular structures and the layout of the LEDs to obtain optimum optical performances. From the simulation results showed that the brightness uniformity was 93.44%.In order to verify the accuracy of simulation, we produced a small size backlight unit(120mm×135mm×30mm). After BM-7 measured, the experiment result showed that the brightness uniformity and color uniformity were 85.61% and 0.021.

並列關鍵字

Backlight ； GA ； Light Emitting Diode

參考文獻

[11]李武原，“以基因演算法達成直下式背光模組之三色發光二極體最佳化角度配置”，中原大學機械工程研究所碩士論文，2006年。

[16]吳珮禎，“LED光源應用於直下式背光模組之設計與研究”，清華大學光電工程系所碩士論文，2006年。

[17]黃順智，“具圖案印刷與微特徵設計導光板之光學性質分析”，中原大學機械工程學系碩士論文，2004年。

[3]F. Yamada, H. Nakamura, Y. Sakaguchi and Y. Taira, “Color Sequential LCD Based on OCB with an LED Backlight,” SID Symposium Digest of Technical Papers, Vol. 31, Issue 1, pp. 1180-1183, May, 2000.

[4]C. H. Chen and H. P. D. Shieh, “Inclined LED Array for Large-Sized Backlight System,” SID Symposium Digest of Technical Papers, Vol. 36, Issue 1, pp. 558-561, May, 2005.

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基因演算法於RGB LED背光模組最佳化設計

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