A compact and high-resolution video projector based on silicon light valves

Author

Huang, H.C. ; Cheng, P.W. ; Kwok, H.S. ; Kwok, S.K.

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong

Volume

45

Issue

4

fYear

1999

fDate

11/1/1999 12:00:00 AM

Firstpage

1144

Lastpage

1149

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 custom 0.5 μm, 3-metal CMOS technology with a spatial resolution of 1024×768 pixels. The pixel pitch was 13.8 μm and the fill factor was 91%. Six-bit digital data drivers and gamma-correction circuitry were integrated within 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 contract ratio at CMOS compatible voltage. The contrast ratio was 100:1 at 3.5 Vrms. The optical system utilized a trichroic prism assembly for both the color separation and recombination. With this trichroic prism assembly incorporating three silicon light valves, a compact and high-resolution video projector was demonstrated.

Keywords

CMOS digital integrated circuits; colour displays; driver circuits; elemental semiconductors; high definition television; image representation; image resolution; light valves; liquid crystal displays; nematic liquid crystals; optical prisms; optical projectors; silicon; video equipment; 0.5 mum; 1024 pixel; 13.8 mum; 3-metal CMOS technology; 3.5 V; 6 bit; 768 pixel; 786432 pixel; CMOS compatible voltage; HDTV; PC monitor; Si; birefringence liquid crystal cell; color recombination; color separation; compact video projector; digital data drivers; display panel; fill factor; full color representation; gamma-correction circuitry; gray scale representation; high contract ratio; high-resolution video projector; liquid-crystal-on-silicon light valve; mixed twisted nematic crystal cell; pixel pitch; silicon light valves; silicon panel; spatial resolution; three-panel color projector; trichroic prism assembly; Assembly; Birefringence; CMOS technology; Contracts; Driver circuits; Integrated circuit technology; Liquid crystal displays; Silicon; Spatial resolution; Valves;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.809195

Filename

809195