High-contrast SXGA silicon light valves for high-definition video projectors

Ho-Chi Huang; Po-Wing Cheng; HoiSing Kwok

doi:10.1117/12.389400

30 June 2000 High-contrast SXGA silicon light valves for high-definition video projectors

Ho-Chi Huang, Po-Wing Cheng, HoiSing Kwok

Proceedings Volume 4079, Display Technologies III; (2000) https://doi.org/10.1117/12.389400
Event: Photonics Taiwan, 2000, Taipei, Taiwan

Abstract

We have developed a highly integrated liquid-crystal-on- silicon light valve for three-panel color projector. The silicon panel was designed and fabricated by a 0.35 micrometers , 3-metal and dual-voltage CMOS process with a spatial resolution of 1280 X 1024 pixels. The pixel pitch was 12 micrometers , the fill factor was 90% and the display area was 0.77' in diagonal. Eight-bit digital data drivers and gamma- correction circuitry were integrated into the silicon panel for true gray scale and full color representation. The display panel was assembled with a mixed twisted nematic and birefringence liquid crystal cell for high contrast at CMOS compatible voltage. Contrast ratio was typically 200:1 at 5.5 Vrms. In addition, silicon surface layers, liquid crystal materials, pixel structures and driving schemes were carefully optimized for the minimization of visual flicker. Flicker ratio of less than 3% was achieved at 60 Hz frame rate. The optical sub-system utilized a trichroic prism assembly for both color separation and recombination. With this trichroic prism assembly incorporating three silicon light valves, a compact and high-contrast SXGA video projector was demonstrated.

Citation Download Citation

Ho-Chi Huang, Po-Wing Cheng, and HoiSing Kwok "High-contrast SXGA silicon light valves for high-definition video projectors", Proc. SPIE 4079, Display Technologies III, (30 June 2000); https://doi.org/10.1117/12.389400

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