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Proceedings Paper

High-contrast SXGA silicon light valves for high-definition video projectors
Author(s): Ho-Chi Huang; Po-Wing Cheng; HoiSing Kwok
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Paper 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.

Paper Details

Date Published: 30 June 2000
PDF: 10 pages
Proc. SPIE 4079, Display Technologies III, (30 June 2000); doi: 10.1117/12.389400
Show Author Affiliations
Ho-Chi Huang, Hong Kong Univ. of Science and Technology (Hong Kong)
Po-Wing Cheng, Hong Kong Univ. of Science and Technology (Hong Kong)
HoiSing Kwok, Hong Kong Univ. of Science and Technology (Hong Kong)


Published in SPIE Proceedings Vol. 4079:
Display Technologies III
I-Wei Wu; Heiju Uchiike, Editor(s)

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