The basic study on improved performance of transflective liquid crystal displays

重量轻且功耗低的高质量彩色液晶显示器（LCD）是高功能信息终端中的重要设备。半透半反式LCD是移动的应用的普遍首选，因为背光和环境光反射的组合在任何环境照明强度下都能产生高可见度。无需对电池进行再充电的低功耗是移动的设备的扩展使用的关键要求。因此，在保持TFT-LCD上级图像质量的同时，降低面板功耗是有利的。为了确定具有两个延迟膜的透反均质单元降低功耗的可能性，我们数值分析了器件参数之间的关系，包括延迟膜的双折射色散，Δn_R（λ），我们发现，优化的LCD产生一个消色差的高质量图像与宽视角，即使当导通电压降低到2.0V。因此，面板中的功率消耗可以降低到在导通状态下以4.0V操作的当前透反式TFT-LCD的功率消耗的大约四分之一。此外，我们研究了使用以前的计算来增强LCD的性能的可行性。通过将关断电压从0 V提高到0.5V，我们进一步降低了LCD的功耗，这并不影响显示特性。我们还实现了相当大的改善视角的光学性能，通过将两个域的结构。此外，我们发现，我们可以很容易地生产液晶显示器使用现有的技术。通过计算证实，即使盒距在设计值的±2%范围内变化，液晶显示器的电光性能也不受影响。

High-quality color liquid-crystal displays (LCDs) that are light weight and low in power consumption are important devices in highly functional information terminals. Transflective LCDs are the general preference for mobile applications because the combination of backlighting and reflection of ambient light creates high visibility under any intensity of ambient illumination. Low power consumption without recharging the battery is a key requirement for extended use of mobile devices. Therefore, it is advantageous to reduce the TFT-LCD's power consumption in the panel while maintaining its superior image quality.To confirm the possibility of reducing power consumption of a transflective homogeneous-cell with two retardation films, we numerically analyzed the relationship between device parameters, including the birefringence dispersion of the retardation film, Δn_R(λ), and the electro-optical properties of the LCD.We found that the optimized LCD produces an achromatic high-quality image with wide viewing angles, even when the on-voltage is reduced to 2.0V. The power consumption in the panel can thus be decreased to about one-fourth that of a current transflective TFT-LCD operating at 4.0V in the on-state. In addition, we studied the feasibility of enhancing the performance of the LCD using previous calculations. We further reduced the power consumption of the LCD by raising the off-state voltage from 0V to 0.5V, which did not affect the display characteristics. We also realized considerable improvement in the optical properties of the viewing angle by incorporating a two-domain structure. In addition, we found that we could easily produce the LCD using present technology. We confirmed by calculation that the electro-optical properties of the LCD were not affected, even if the cell-gap changed to ±2% from the designed value.