New Reflective-type liquid Crystal Displays of very low power consumption, thin structure and high image quality

新型反射式液晶显示器，功耗极低、结构薄、图像质量高

• 批准号: 09650392
• 负责人: FUKUDA Ichiro
• 金额: $ 2.05万
• 依托单位: Kanazawa Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650392/
• 关键词: LCD; Reflective-type; TNLCD; STNLCD; Achromatic-LCD; Color-LCD; Normally white mode; Normally black mode

We have previously proposed a new, achromatic reflective TNLCD, and STNLCD with one polarizer and one retardation film. The LCDs enable creation of are reflective color LCD using a color-mixing system such as the micro color filter type. We have studied by computer simulation the electro-optical properties of the LCDs, and we found that the LCDs provided a high-brightness, high-contrast ratio and achromatic display by optimization of cell parameters. With these optimized conditions, we have fabricated 24-cm (9.5- in.)-diagonal VGA monochrome and 512-color reflective TNLCDs. We achieved a reflectance of monochrome and color reflective TNLCD of more than 180 and 90% respectively with*15 degree of the detector angle, with peak reflectance comparable with standard white (BaSO4) ; the maximum contrast ratio of both is 6 : 1. These values are acceptable for reflective LCDs.However, the TNLCD of the normally black mode has the problem that the higher the resolution is, the lower the luminance becomes due to the space between electrodes. In order to solve this problem, we have proposed a new normally white mode achromatic reflective TNLCD, composed of the above mentioned normally black mode reflective TNLCD and one liquid-crystal polymer film with a twist angle of the same magnitude, but with an opposite-handed to the LC layer. The electrooptical properties oh the LCD were numerically analyzed, and it was found that several sets of solutions exist for obtaining an achromatic image with high luminance as well as high contrast ratio.Furthermore, we have proposed a new color LCD using birefringent effect, composed of the STNLCD with a single polarizer and one retardation film. The LCD has advantage f low cost because of no color filter, and high resolution because of no parallax. The electro-optical properties of the LCD were numerically analyzed, and it was found that several sets of solutions exist for obtaining a multi-color image to be acceptable for reflective LCDs.

我们先前已经提出了一种新的，消色差反射TNLCD，和STNLCD与一个偏振片和一个延迟膜。LCD使得能够使用诸如微滤色器类型的颜色混合系统来创建反射式彩色LCD。我们通过计算机模拟研究了液晶显示器的电光特性，发现通过优化单元参数，液晶显示器提供了高亮度、高对比度和消色差的显示。在这些优化的条件下，我们已经制备了24-cm（9.5- in.）-对角线VGA单色和512色反射式TNLCD。我们实现了单色和彩色反射TNLCD的反射率分别超过180和90%，与标准白色（BaSO 4）的峰值反射率相当，两者的最大对比度为6：1。这些值对于反射型LCD来说是可以接受的，但是，常黑模式的TNLCD存在分辨率越高，由于电极间的间隔而亮度变得越低的问题。为了解决这个问题，我们提出了一种新的正常白色模式消色差反射TNLCD，由上述正常黑色模式反射TNLCD和一个液晶聚合物膜组成，该液晶聚合物膜具有相同大小的扭曲角，但具有与LC层相反的旋向。对液晶显示器的电光特性进行了数值分析，发现在获得高亮度和高对比度的消色差图像方面存在几种解决方案，并提出了一种利用双折射效应的新型彩色液晶显示器，它由一个偏振片和一个延迟片组成。液晶显示器的优点是无滤色器，成本低，无视差，分辨率高。的电光性能的LCD进行了数值分析，并发现，存在几组解决方案，以获得多色图像是可接受的反射式LCD。

项目成果

Ichiro Fukuda: "Reflective-type TN-LCDs with single polarizer" Proceedings of SPIE,Liquid Crystals II. 34・75. 24-34 (1998)

福田一郎：“具有单偏振器的反射型 TN-LCD”，SPIE 论文集，Liquid Crystals II 34・75（1998 年）。

坂井栄治: "一枚偏光板による512色反射型TFT-LCD" 映像情報メディア学会誌. 51・7. 1061-1069 (1997)

Eiji Sakai：“使用单个偏光板的 512 色反射 TFT-LCD”图像信息和电视技术研究所杂志 51・7 1061-1069（1997 年）。