Development of extremely low power reflective color liquid crystal display with high brightness

开发出极低功耗高亮度反射式彩色液晶显示器

• 批准号: 02555076
• 负责人: UCHIDA Tatsuo
• 金额: $ 9.34万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555076/
• 关键词: Liquid Crystal; Display; Guest-Host Mode; Reflective Display; Color Display; Diffusing Reflector

A key to achieve the target of this research was to increase reflected light level as high as possible. For this purpose, the following investigation has been made and the target has been achieved.1. Various liquid crystal display mode was theoretically and experimentally studied in the term of braghtness and contrast. It was found from the results that phase change type guest-host mede (PCGH-mode) was most suitable for the reflective type liquid crystal display (LCD). The optimum design condition for the PCGH-mode was also clarified.2. Transmittance spectrum of micro-color filter was investigated. It was clarified that the optimum design concept for the spectrum considering lightness, hue and chroma of individual and mixed color for the micro-color filters.3. Relation between surface roughness of the reflector and its reflective property was investigated and the optimum design condition of the roughmess was clarified. In addition, method to fabricate the rough surface by photo-process was established. Suitable condition for designing the roughness pattern to obtain uniform reflective property without interference color in the specific direction was investigated.Based on the results mentioned above, the reflective color LCD with active matrix driver using thin film transistor was successfully made. The fabricated display was a first reflective color display with sufficient brightness.

实现本研究目标的一个关键是尽可能提高反射光强。为此，进行了以下调查，并实现了目标1。从直观性和对比度两方面对各种液晶显示模式进行了理论和实验研究。结果表明，相变型客主模式(PCGH模式)最适合反射型液晶显示器(LCD)。阐明了PCGH模式的最佳设计条件。研究了微型滤色器的透过率光谱。阐明了微滤色器考虑单色和混合色的明度、色调和色度的光谱优化设计思想。研究了反射镜表面粗糙度与反射性能的关系，明确了反射镜表面粗糙度的最佳设计条件。此外，还建立了光刻法制备粗糙表面的方法。在此基础上，利用薄膜晶体管制作了反射式有源矩阵驱动的反射式彩色LCD。所制造的显示器是第一个具有足够亮度的反射式彩色显示器。

项目成果

伊藤 康尚: "視角依存性の少ない2層型ECBセル" 1990年(平成2年)秋季第51回応用物理学学術講演会講演予稿集. 792 (1990)

伊藤康直：“具有很少视角依赖性的双层 ECB 单元”第 51 届应用物理学术会议论文集，1990 年秋季。792 (1990)

関 秀廣: "広視野角2層型ECBセルの光学補償" 1992年(平成4年)春季第39回応用物理学関係連合講演会講演予稿集. (1992)

Hidehiro Seki：“宽视角两层 ECB 电池的光学补偿”第 39 届应用物理学春季会议论文集（1992 年）。

Hidehiro Seki: "Evaluation of the Tilted Homeotropic Alignment of Liquid-Crystal Molecules Using the Rubbing Method" Molecular Crystal Liquid Crystal, in printing. (1992)

Hidehiro Seki：“使用摩擦法评估液晶分子的倾斜垂直排列”分子晶体液晶，印刷中。

Hidehiro Seki: "Tilted Homeotropic Alignment of Liquid-Crystal Molecules Using Rubbing Method" Proceedings of the 13th International Liquid Crystal Conference. 13. (1990)

Hidehiro Seki：“使用摩擦法进行液晶分子的倾斜垂直排列”第 13 届国际液晶会议论文集。

Hidehiro Seki: "A Double-Layer Electrically Controlled Birefringence Liquid-Crystal Display with a Wide-Viewing-Angle Cone" The Bulletin of Hachinohe Institute of Technology. 11. 3-9 (1992)

Hidehiro Seki：“具有宽视角锥体的双层电控双折射液晶显示器”八户工业大学通报。