06246446 is referenced by 34 patents and cites 25 patents.

An image display system (

10

) having an auto-focus system (

24

). An image sensor (

20

) such as a CCD camera, senses the sharpness of pixels (

26

) comprising a portion of the image at a screen (

16

), preferably a magnified portion of the image. A sensor data processor (

22

) processes the pixel data from the sensor (

20

), and instructs the auto focus system (

24

) to adjust an optical parameter such as the focal length of a projector lens (

14

) as a function of the sensor (

20

) output. A DMD-type SLM is preferably utilized due to the uniform geometric features of the pixel mirrors, but other SLM's can be used. The sharpness or contrast between an “on” and an “off” pixel is sensed, and preferably a 10×10 array of pixels arranged in a checker board pattern is sensed.

Title
Auto focus system for a SLM based image display system
Application Number
8/872634
Publication Number
6246446 (B1)
Application Date
June 10, 1997
Publication Date
June 12, 2001
Inventor
James Vorgert
Plano
TX, US
Scott Heimbuch
Dallas
TX, US
Agent
Frederick J Telecky Jr
US
Wade James Brady III
US
Charles A Brill
US
Assignee
Texas Instruments Incorporated
TX, US
IPC
H04N 5/74
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