A 90° mixed-mode twisted nematic liquid-crystal-on-silicon with an insulating protrusion structure*

A 90 degrees mixed-mode twisted nematic liquid-crystal-on-silicon (90 degrees-MTN LCoS) with protrusion located between the adjacent pixels is proposed to reduce the effect of fringing field. The influence of the protrusion with different widths from 0.5 mu m to 0.9 mu m and different heights from 0.3 mu m to 0.7 mu m is investigated. The results demonstrate that the invalid pixel region width can be reduced by 31.5% via using the protrusion with the suitable width and height compared with no protrusion case, which provides a higher display quality, such as the higher reflectance and contrast ratio.