# US 7,612,771 B2 · Image projection system comprising a single imager which is equipped with photosensitive sensors for the identification of illumination colours

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- Number: US 7,612,771 B2
- Document ID: US7612771B2
- Status: Granted
- Kind: B2
- Application number: 10/541,634
- Filed: 2004-01-05
- Published: 2006-09-21
- Granted: 2009-11-03
- Earliest claimed: 2003-01-07
- Assignees: Thomson Licensing
- Inventors: Khaled Sarayeddine; Laurent Blonde
- Web page: https://patentgrep.com/patent/US7612771B2

## CPC

- G02F 1/136: Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit (G02F1/135 takes precedence)
- H04N 9/3117: {by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands}
- H04N 9/312: {Driving therefor (driving of electronic spatial light modulators in displays other than projection devices G09G3/34, G09G3/36; control of liquid crystal elements G02F1/133; control of micromechanical modulators G02B26/08)}
- H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)}
- H04N 9/3194: {including sensor feedback}
- H10F 39/182: {Colour image sensors}
- G02F 1/136277: {formed on a semiconductor substrate, e.g. of silicon}
- G02F 2201/58: Arrangements comprising a monitoring photodetector
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION

## Abstract

An image projection system has an illumination system for moving bands of different colored light over the light valve. The image projection system identifies the illumination color of each row of pixels of this light valve, manages the video data of the images to control the writing of the pixels, synchronizes the video data sent to each row of pixels according to the identified illumination color of the row. At least one photosensitive sensor is level with certain rows of pixels of the light valve, is incorporated in the substrate and is designed to identify in real time the illumination color of each row.

## Claims

### Claim 1

An image projection system comprising:
a light valve comprising a pixel matrix array disposed in rows and columns on a substrate forming an active matrix,
an illumination system for moving bands of different colored light over the light valve, perpendicularly to said rows,
means for identifying the illumination color of each row of pixels of the light valve,
means of managing video data of said images for controlling the writing of said pixels of the light valve,
means of synchronizing the video data sent to each row of pixels of the light valve according to the illumination color of said row identified by said identification means,
wherein the identification means comprises at least one photosensitive sensor level with each row of said pixels of the light valve, each sensor of row being designed to identify directly the illumination color of that row and to measure the illumination intensity of that row, and
wherein the measurement of the illumination intensity is used in the means of managing video data to adjust the video data and the colors of said images for controlling the writing of said pixels.

### Claim 2 (depends on 1)

The image projection system as claimed in claim 1, wherein the or each photosensitive sensor of the light valve is incorporated in said substrate.

### Claim 3 (depends on 1)

The image projection system as claimed in claim 1, wherein the or each photosensitive sensor is associated with a colored filter.