基於色彩空間之軟性顯示器色彩均勻性分析-以膽固醇液晶顯示器為例

Color Space Based Uniformity Analysis for Flexible Displays-A Case Study on Cholesteric Liquid Crystal Displays

蕭清中(Cing-Jhong Siao)

指導教授 ： 劉益宏 博士

中原大學/工學院/機械工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200900509

摘要

雙穩態膽固醇液晶顯示器是一種具有高亮度、高對比、省電、有記憶性、廣視角、不閃爍等優點的新型軟性面板顯示技術，未來可廣泛的應用於戶外大型廣告看板及可攜式產品。雙穩態膽固醇液晶顯示器，於面板生產製作過程中及未來商品化量產後，都無法避免因為人為或機台等因素而產生瑕疵，進而影響到面板的顯示效果。目前面板各種失效模式與製程設計之關連性尚未非常清楚。因此，本論文針對膽固醇液晶顯示器，發展一套色彩均勻度分析影像檢測系統將有顯著的貢獻。此系統所擁有的分析功能將有助於廠商提升製程的研發速度，降低研發所需耗費的成本。面板影像是經由高解析度掃描器掃描後所取得。此分析系統由三大部分所組成：第一階段，首先將面板影像切割成數等分，接著第二階段再結合國際照明委員會所提出的色彩空間，將面板影像RGB色彩資訊轉換至CIE 1976 UCS色度圖、CIE 1976 L*a*b*色彩空間中，即可得到該面板的色度、亮度及色差之色彩量化值。最後基於統計的原理，計算色度及亮度標準差，此標準差值即為判斷面板色彩均勻性指標。實驗結果證明，以上的量化指標均可以有效地反映出面板影像中瑕疵的存在及瑕疵的嚴重程度。此外，本檢測系統所得到的色度值也可以用來推測瑕疵的成因。

關鍵字

瑕疵檢測 ； 雙穩態膽固醇液晶顯示器 ； 軟性平面顯示器 ； 色彩均勻度

並列摘要

The Bistable Cholesteric liquid crystal display (BS-ChLCD) is the innovative technology of display of flexible panel, having the advantages of high-brightness, of high-contrast, of energy-efficiency, of memory ability, of broad visual angle, of non-glittery functions, and in the future it can be exercised widely on out-door huge advertisement signboards as well as portable products. During the manufacturing process of the panel and commercialization, quantitative production, it will be inevitable that the BS-ChLCD have defects generated from human or machines, and which will certainly damage the performance of the panel. Nowadays it is not extremely definite to explain the relationships between malfunction modes of varied panels and manufacturing process designs, so this thesis aims at the BS-ChLCD to develop a set of image- analyzing and inspection system of color uniformity, which will have a significant contribution. The effective analysis will assist factory owners to accelerate research and development during the manufacturing process and lower the cost of research and development. In addition, the image of the panel is obtained from a high resolution scanner. The analysis system consists of three parts: at the first stage, firstly, the image of the panel was divided into several small portions; next, at the second stage, several small portions of the image are combined with color space provided by Commission internationale de l'éclairage (CIE). The image of the panel, RGB color information, was transferred into CIE 1976 UCS chromaticity chart and into CIE 1976 color space, which creates the value of color quantity to chromaticity, to brightness and to color difference. Finally, according to the principle of statistics, this thesis calculated the standard deviation of chromaticity and brightness, and the standard deviation is viewed as the index to judge color uniformity. The result of the experiment demonstrates that quantitative index above can effectively reflect the presence of the defect of the image on the panel and its damage degree. Moreover, the value of the chromaticity from inspection system can be used to speculate the cause of the defect.

並列關鍵字

defect inspection ； color uniformity ； flexible display ； bi-stable cholesteric liquid crystal display

參考文獻

[6]陳志忠，“液晶顯示器的像素點缺陷與相對亮度均一性之自動化檢測,” 私立中原大學機械工程學系碩士論文，2001.

[14]陳振昌，“軟性顯示器之光電特性量測,” 國立清華大學光電工程研究所碩士論文，2006.

[18]王建達，“基板上預先形成之聚合物穩定反射式雙穩態膽固醇液晶顯示器之研究,”私立崑山科技大學電子研究所碩士論文，2005.

[2]黃雅鈴，“類紙式膽固醇液晶顯示器,” 國立成功大學物理研究所碩士論文，2005.

[3]Y. H. Liu, and Y. T. Chen, “Face detection using kernel PCA and imbalanced SVM Advances in Natural Computation,” Lecture Notes in Computer Science, vol. 4221, pp 351–60, 2006.