Fringe‐Field Effects In Reflective CMOS LCD Design Optimization

Abstract

Reflective CMOS LCD light valves have high brightness and high information content. Unlike direct view displays, microdisplays also have interpixel spacing several time smaller than the cell gap. This in combination with the small pixel formats lead to fringe‐field effects having a significant impact on the effective display brightness and contrast of μLCD's.

3D Modeling of Single-Domain and Multi-Domain Vertical Alignment LCDs for Direct-View and Microdisplay Geometries

“…Our study also showed a regular VA operation can be obtained in the direct-view LCD, but not in the microdisplay geometry. The results showed a small crossed talk and small edge disclination images from the LC reverse titled orientation for the direct-view VA LCD, but a large crossed-talk, large LC reverse titled combined with large twist orientation for the microdisplay VA geometry [15,[20][21][22][23][24]. This is consistent with experimental observation results.…”

40.1: Invited Paper: Scrolling Color LCOS for HDTV Rear Projection

“…The ability to resolve the edge of the pixel is related to the LC gap. The thicker the gap, the greater the influence of fringe-field effects [5]. So to maintain resolution the LC gap should be significantly less than the pixel size.…”

Normally black reflective twisted-nematic cell for microdisplay application

“…6 The VA mode exhibits an unprecedented contrast ratio, but it suffers from a serious fringing field effect from adjacent pixels. [7][8][9] As a result, each bright pixel is split into two unequal parts separated by a dark line. This split pixel decreases the optical efficiency to ϳ70%.…”