权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The basic study on new high picture quality reflective-type color liquid crystal display

新型高画质反射式彩色液晶显示器的基础研究

基本信息

批准号：
12650352
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：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

High-quality, lightweight, reflective color LCDs with low power consumption are important devices for highly functional and portable information terminals. Though various reflective LCDs have been proposed, only reflective color LCDs using a single-polarizer TN-LCD and STN-LCD are presently being used in practical applications. However, the quality of the reflective LCDs must be improved. To achieve this, we proposed some new reflective LCDs like the following and numerically analyzed the electro-optical properties of the LCDs.1. Single-polarizer DSTN-LCD and FDSTN-LCD with a quarter-wave plate2. Single-polarizer DTN-LCD and FSTN-LCD with a quarter-wave plate3. Single-polarizer MDTN-LCD with a retardation filmWe found that the display mode (1) exhibits a high contrast ratio of infinity in theory and high luminous reflectance of 48 %, independent of the duty ratio, and display modes (2) and (3) exhibit a very high contrast ratio and a high luminous reflectance of 50 % through optimum deign of the device parameters. In addition, the consumption of the reflective color TN-LCD is several times larger than that of the reflective color STN-LCD. It is thus desirable to reduce the TN-LCD's power consumption while maintaining its high image quality. In order to confirm the possibility to reduce power consumption, we analyzed the relationship between the electro-optical properties of some new reflective LCDs like the following and the on-voltage of a TFT-LCD.1. Single-polarizer DTN-LCD and FSTN-LCD with a quarter-wave plate2. Single-polarizer DTN-LCD and FSTN-LCD with a retardation film3. Single-polarizer TN-LCD with retardation film of the two sheetsWe found that the LCDs exhibit an achromatic image of high luminous reflectance of about 50 % and a very high contrast ratio, even if the on- voltage is reduced to 2V. The power consumption can thus be decreased to about 1/6 to 1/7 that ofa current reflective 5V TFT-LCD in the on- state.

高质量、轻质、低功耗的反射式彩色液晶显示器是高功能、便携式信息终端的重要设备。虽然已经提出了各种反射式LCD，但目前实际应用中仅使用使用单偏振器的TN-LCD和STN-LCD的反射式彩色LCD。然而，反射式LCD的质量必须提高。为了实现这一点，我们提出了一些新的反射式LCD，如下所示，并对其电光特性进行了数值分析。单偏振器DSTN-LCD和FDSTN-LCD与四分之一波片2。单偏振器DTN-LCD和FSTN-LCD与四分之一波片3。通过对器件参数的优化设计，得到了与占空比无关的显示模式(1)具有很高的对比度和高的光反射率(48%)，显示模式(2)和(3)具有很高的对比度和50%的高反射率。此外，反射式彩色TN-LCD的消耗是反射式彩色STN-LCD的几倍。因此，希望在保持其高图像质量的同时降低TN-LCD的功耗。为了确定降低功耗的可能性，我们分析了以下几种新型反射式LCD的电光性能与TFT-LCD导通电压的关系。单偏振器DTN-LCD和FSTN-LCD与四分之一波片2。单偏振片DTN-LCD和FSTN-LCD，带有延迟膜。我们发现，即使在开启电压降低到2V的情况下，这种LCD也表现出高达50%的高亮度反射率和非常高的对比度的消色差图像。因此，功耗可以降低到导通状态下电流反射式5V TFT-LCD的大约1/6到1/7。