光柵分色應用於背光系統之實用化研究

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姓名

葉尚祐(Shang-Yu Yeh) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

光柵分色應用於背光系統之實用化研究
(Practical Study of grating separations used in the backlight system)

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摘要(中)

本論文欲利用雙層光柵期望將光源進行分光，藍、綠、紅光波長混合
的白光經過光柵後，因波長不同造成之繞射角度不同而分離藍光、綠光和
紅光三種色光，並使用橢圓透鏡微結構聚焦在一個畫素中相對於彩色濾光
片藍、綠、紅光的位置。
利用雙面光柵的設計增加藍、綠、紅光波長的繞射角度差，並且兼顧
最大穿透繞射階的效率。光柵分光後再利用橢圓透鏡微結構，使最大穿透
繞射階的效率和次兩階穿透繞射階的效率重疊在一個畫素中藍、綠、紅光
的位置。
在使用理想光源時，在色域圖上面積最高可以達到NTSC 的80.11%；
在能量利用率上，最佳效率有70.73%遠比使用彩色濾光片時高。在考慮實際背光的角度下，同樣架構在色域圖上面積有NTSC 的65.86%，在能量利用率上，效率有43.13%依然比使用彩色濾光片時高。此結果說明將光柵分光利用在背光系統可改善目前使用彩色濾光片導致效率較低之問題。

摘要(英)

This study proposes a feasible design of color separation for a collimated
backlight to realize a color-filter-free liquid crystal display (LCD). The design
includes a double-sided saw-tooth grating and array of elliptical cylindrical lenses
attached to the LC panel. The double-sided saw-tooth grating can diffract the
collimated light beam composed of red, green, and blue light beams; and separate
them from each other for about 5 degrees, which is the key point to realized color
separation.
However, the efficiency of the main-order diffraction decreases as increase in
the separation angle between the color light beams. To overcome this problem,
we design the array of elliptical cylindrical lenses to concentrate the diffracted
color light beams on the corresponding subpixel and let the subpixel receive the
color light beams of different diffraction orders. For an ideal collimated backlight
with a half angle of 2.5 degrees and three light sources of 465, 530, and 625 nm,
the optimal design performs color gamut 80.11% and optical efficiency 70.73. For
a practical collimated backlight with a half angle of 5 degrees (5-degree FWHM)
and three LED light sources (considering wavelength width), the optimal design
performs color gamut 71% and optical efficiency 37.16, whose color gamut is
comparable and efficiency is increased 30% as compared with the traditional LCD.

關鍵字(中)

★ 光柵
★ 橢圓柱狀透鏡微結構
★ 背光模組

關鍵字(英)

★ Grating
★ array of elliptical cylindrical lenses
★ Backlight

論文目次

摘要 I
ABSTRACT II
致謝 III
目錄 IV
圖目錄 VII
表目錄 XIII
第一章　緒論 1
1-1　研究動機與目的 1
1-2　光柵介紹 1
1-3　文獻回顧 3
1-4　論文架構 4
第二章　基礎理論 6
2-1　光學基礎原理簡介 6
2-1-1　反射(REFLECTION) 6
2-1-2　透射(TRANSMISSION) 6
2-1-3　吸收(ABSORPTION) 7
2-1-4　FRESNEL方程式 7
2-2　繞射元件簡介 9
2-2-1　繞射元件理論及計算 9
2-2-2　繞射角度公式的簡介與推導 10
2-3　光度學簡介 12
2-3-1　光通量(LUMINOUS FLUX，Φ) 12
2-3-2　強度（LUMINOUS INTENSITY，I） 12
2-3-3　照度(ILLUMINANCE，E) 13
2-3-4　亮度(BRIGHTNESS，B) 14
2-3-5　輝度(LUMINANCE，L) 14
第三章　光柵設計及分析 17
3-1　初步架構及各步驟之流程 17
3-2　單層光柵設計的分析與探討 18
3-2-1　光柵繞射角度探討 19
3-2-2　光柵初步設計及效率探討 27
3-2-3　光柵做切角對於效率之影響 35
3-2-4　單層光柵設計結果討論 38
3-3　雙層光柵設計的分析與探討 39
3-3-1　雙層光柵基本架構 39
3-3-2　上層週期2 ΜM和下層週期2 ΜM之配置 41
3-3-3　上層週期2 ΜM和下層週期1.5 ΜM之配置 47
3-3-4 上下合併與基準光柵之選擇 51
3-3-5　雙層光柵切角對效率之影響 56
3-3-6　入射PHI角和入射THETA角對效率之影響 58
第四章　背光分色效果之研究與討論 61
4-1　背光分色架構 61
4-2　NTSC 62
4-3　光源條件 62
4-4　BSDF 66
4-5　橢圓柱狀透鏡微結構設計之介紹與分析 69
4-6　模擬結果與討論 76
4-6-1　黑色遮光層(BLACK MATRIX)與各條件之優化設計 83
4-6-2　考慮實際背光的出光角度分布 91
第五章　結論與未來展望 102
5-1　結論 102
5-2　未來展望 103
參考文獻 105

參考文獻

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指導教授

孫文信(Wen-Hsin Sun)

審核日期

2016-8-19

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