Video projector

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...


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350338, 350334, 340784, 353 34, G02F 113, G09G 336




A video projector utilizes a reflective liquid crystal light valve of the active matrix system and a polarizing beam splitter. An active matrix array circuit of the light valve has pixel electrodes arranged in a matrix mattern. The pixel electrodes each has a reflective surface for reflecting a light beam and protects corresponding switch elements from the light beam. There are provided at least two switch elements for each of the pixel electrodes so as to enhance the redundancy of the array circuit. Further, each pixel electrode is provided with a suitable additional capacitance.

patent: 4425028 (1984-01-01), Gagnon et al.
patent: 4544237 (1985-10-01), Gagnon
patent: 4761058 (1988-08-01), Okubo et al.
patent: 4781438 (1988-11-01), Noguchi
patent: 4822142 (1989-04-01), Yasui
Depp et al, "Liquid Crystal Display Driver Circuit and Polysilicone Components Therefor", IBM, vol. 23, No. 8, Jan. 1981, p. 3863.
Kawai et al "A Self-Alignment processed a-Si:H TFT Matrix Circuit for LCD Panels" Proceedings of the SID, vol. 25/1, 1984.


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