卷帘式彩色LCoS显示器的对比度改善

Contrast Improvements for Scrolling Color LCoS

卷帘式彩色LCoS(硅上液晶)显示必须展现其快速和高对比度两项特性。这些要求推动了成像核心的液晶和光学系统的设计选择。我们发现,输入方向必须沿着入射偏振方向,且须选择一种补偿性的45TN0效应。高对比度需要对界面反射提出严格的要求。线栅PBS能实现高的对比度且能简化系统结构。在关注上述问题的同时,我们曾报告过,在视屏上的时序对比度为8001。采用90TN0效应,其对比度可以更高,但会有一些光效损失。采用这种效应所测时序对比度为20001。

A scrolling color LCoS (liquid crystal on silicon) display must exhibit both fast speed and high contrast.These requirements drive design choices for the liquid crystal and optics of the image kernel. We find the input director must be aligned to the incoming polarization and choose a compensated 45TN0 effect. Contrast demands place tight requirements on interfacial reflections. A wire-grid PBS can achieve high contrast and can simplify the system construction. With attention to the above, we report a sequential contrast of 800:1 at the viewing screen. With a 90TN0 effect contrast can be increased even further, but with some penalty in light efficiency. With this effect sequential contrast of 2000:1 was measured.