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Patent EP0601666A1 successfully refreshed from Google Patents.
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EP0601666A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Colour sequential light valve display device

Assignee: Koninklijke Philips NV
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Filing: 1993-12-07
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Granted: —
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Expires: 2013-12-07
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Abstract

Abstract A colour projection video system utilizing only a single light valve (20). A white light source is separated into red, green and blue bands. Scanning optics (14 )in the form of three prisms coaxially mounted for rotation cause the RGB bands to be sequentially scanned across a light valve (20), such as a transmission LCD panel. Prior to each colour passing over a given row of panels on the light valve, that row will be addressed, by the display electronics (60) with the appropriate colour content of that portion of the image which is being displayed. The image is projected by a projection lens (22) onto a viewing surface, such as a screen. The sequence of light bands occurs so quickly as to give the viewer an appearance of simultaneous full colour.

Inventors

  • 👤 Peter C/O Int. Octrooibureau B.V. Janssen

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 18:34
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3111; H04N9/3117; H04N5/00; H04N5/74; G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/108

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 158 words
A colour display device comprising light valve means, an illumination system providing sequentially scanned bands of different colours, a single light valve, an optical system for directing said sequentially scanned bands of different colours across the surface of said light valve, an electronic light valve driving circuit for addressing each light valve portion illuminated by a colour band so that the said portion provides image information of the colour of said colour band and modulates said band with said information, the illumination system comprises a source of white light, a colour-selective subsystem for splitting said white light into red, green and blue bands and means for scanning said bands of red, green and blue sequentially, characterized in that said scanning means comprise first, second and third prisms disposed coaxially with one another, each of said prisms being disposed offset at a 30° angle of rotation from one another; and means for rotating said first, second and third prisms.
Claim 2
Dependent Claim 18 words
A device as claimed in Claim 1, wherein said first, second and third prisms each have four sides.
Claim 3
Dependent Claim 23 words
A device as claimed in Claim 1 or 2, further including optical means for horizontally offsetting said beams onto said light valve means.
Claim 4
Dependent Claim 23 words
A device as claimed in Claim 1, 2 or 3, characterized in that the colour selective subsystem comprises a system of dichroic mirrors.
Claim 5
Dependent Claim 22 words
A device as claimed in Claim 1, 2, 3 or 4, characterized in that said light valve means comprise a transmission LCD.
Claim 6
Dependent Claim 24 words
A device as claimed in Claim 1, 2, 3, 4 or 5 characterized in that said first, second and third prisms comprise optical plastic.
Claim 7
Dependent Claim 26 words
A device as claimed in Claim 1, 2, 3, 4, 5 or 6 characterized in that said first, second and third prisms comprise a single moulding.

References Cited (Backward Citations)

EP0492721A2 Cited

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