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Illumination system for displaying images without colour break

A technology for displaying images, image frames, applied in the system field of upstream relay images

Inactive Publication Date: 2008-09-10
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For example, it is known from document US 2002 / 0024618 that such systems operating in sequential color mode pose a risk of color break-up during projection, when the displayed image is in motion or when the viewer moves over the projected image This causes multiple colored outlines to appear on the displayed image when its line of sight

Method used

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  • Illumination system for displaying images without colour break
  • Illumination system for displaying images without colour break
  • Illumination system for displaying images without colour break

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Embodiment Construction

[0050] will refer to figure 1 and figure 2 A general exemplary embodiment of the system of the present invention will be described.

[0051] The system comprises a light source which preferably emits a beam of white light making it possible to illuminate the spatial light modulator 2 . The spatial light modulator 2 includes a group of pixels (pixels) arranged in a matrix, and is, for example, a liquid crystal valve. The color filter 3 spatially filters the different wavelengths corresponding to red, green and blue in order to be able to illuminate the spatial light modulator 2 with light beams of different colors.

[0052] The transmissive optic 4 is able to image substantially every point of the color filter 3 in the plane of the spatial light modulator 2 . Furthermore, in the case of projection or rear projection applications, the exit optic 6 can configure the light beam transmitted through the spatial light modulator.

[0053] The color filter 3 has a set of basic col...

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Abstract

The invention concerns an image display system comprising: a light source (1) emitting an illuminating laser beam, a spatial light modulator (2) controlled by control video signals corresponding to a succession of image frames; a matrix filter (3) consisting of an array of different elementary colour filters, illuminated by said illuminating beam and transmitting a spatially colour-filtered beam to the spatial light modulator (2), an image of said filter being produced on an input surface of the spatial light modulator; means for displacing the filter image (3) on the input of the spatial light modulator (2); and a control device(5) for controlling at least one sequence of displacements of the filter image upon each image frame display.

Description

technical field [0001] The invention relates to a system for displaying images by means of a spatial light modulator. [0002] The invention is particularly applicable to mono-display video rear-projection or projection systems with matrix displays, and especially to systems employing an image relay upstream of the projection screen. The object of the present invention is to improve the picture quality of sequential color television. In addition, the invention makes it possible to degrade the video obtained with a camcorder that records the image projected on the projection screen. Background technique [0003] Two types of single imager architectures are known: [0004] a-All pixels (pixels) of the imager always see the same color: "full red", "full green" or "full blue"; this is done using a color wheel that rotates in front of the imager acquired. This method is called "sequential color"; [0005] The scanning of the b-imager takes place "line by line" (case of "colo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357H04N9/31H04N5/74G09G5/02G02F1/1335
CPCH04N9/3197H04N9/3117G02F1/133621H04N9/315H04N9/31H04N5/74
Inventor 洛朗·布隆德迪迪埃·杜瓦扬哈立德·萨拉伊戴恩
Owner THOMSON LICENSING SA
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