The basic study on improved performance of transflective liquid crystal displays

高质量、低功耗的彩色液晶显示器是高功能信息终端中的重要器件。由于背光和环境光的反射相结合，在任何强度的环境照明下都能产生高可见度，因此反射式lcd在移动应用中是普遍的首选。无需充电的低功耗是移动设备长期使用的关键要求。因此，在保持其优越的图像质量的同时，降低TFT-LCD在面板中的功耗是有利的。为了确认具有两个延迟膜的透射均匀电池降低功耗的可能性，我们数值分析了器件参数（包括延迟膜的双折射色散Δn_R(λ)）与LCD电光特性之间的关系。我们发现，优化后的LCD即使在导通电压降至2.0V时，也能产生具有宽视角的消色差高质量图像。因此，面板中的功耗可以降低到电流反射TFT-LCD在导通状态下工作在4.0V的四分之一左右。此外，我们还研究了利用先前的计算方法提高液晶显示器性能的可行性。我们进一步降低了LCD的功耗，将关断电压从0V提高到0.5V，这并不影响显示特性。通过加入双畴结构，我们还实现了视角光学性能的显著改善。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。我们通过计算证实，即使电池间隙从设计值变化到±2%，LCD的电光性能也不会受到影响。

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.