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Multiplexed multi-image source display writing system
| Details |
Inventors: Montroy, John T.; Garcia, John P.; Gold, Ronald S.; Freeman, Jerry E.;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Dowling; William
Assistant Examiner:
Attorney, Agent or Firm: Lachman; M. E., Sales; M. W., Denson-Low; W. K.
A projection system wherein two or more separate display sources, such as high brightness sources, or active matrix liquid crystal display (AMLCD) or other flat panel displays are used to write information directly onto a display screen, or onto a photoactivated reflective light valve for projection onto the display screen. Sequential imaging apparatus is used to alternately generate first and second images for display. For example, such images are coupled to the photoactivated reflective light valve and an illumination source is employed to illuminate the light valve and project a composite image onto the display screen. The flat panel displays may be transmissive, reflective, or self-emissive with the use of an optical shutter. A writing illumination source is used for non-self-emissive flat panel displays. Using high brightness display sources, the images may be directly written onto the display screen without the use of the reflective photoactivated light valve and the illumination source. In the present invention, each video frame is divided equally among the AMLCD/flat panel displays either spatially or temporally, and the flat panel displays are optomechanically multiplexed or optically shuttered by a multiplexer, thus imaging partial frames of information sequentially or completely onto the photoactivated light valve. This results in a complete frame or sequence of frames written onto the photoactivated light valve and displayed on the screen. The present invention reduces the data rate requirements on the image sources by a factor of two, four, or more. This is a significant advantage for super-definition projection systems with multi-megapixel count requirements. Blemish/defect mitigation is achieved by alternately writing to the flat panel displays using a ping-pong approach with one-to-one full resolution flat panel displays. |
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DETAILED DESCRIPTION In order to meet the above and other objectives, the present invention comprises projection apparatus for providing an image on a display screen that has a predetermined high (display) image resolution.
The projection apparatus comprises first and second display sources for generating first and second images having predetermined low image resolutions that when combined form a composite image having the predetermined high (display) image resolution.
Sequential imaging means is provided for processing the first and second images derived from the first and second display sources to produce the composite image having the predetermined high (display) image resolution for display that is imaged onto the display screen.
The apparatus may further comprise a reflective photoactivated light valve disposed between the sequential imaging means and the viewing screen for receiving the composite image produced by the sequential imaging means, and an illumination source for applying illumination light to the photoactivated reflective light valve to generate a reflected image having the predetermined high (display) image resolution on the display screen.
Thus, the present invention uses two or more display sources, such as flat panel displays, including active matrix liquid crystal displays (AMLCD), for example, to write information directly onto a display screen, or onto a reflective photoactivated light valve for projection onto the display screen.
Using high brightness display sources, the images may be directly written onto the viewing screen without the use of the reflective photoactivated light valve and its illumination source.
The present invention may utilize one of many types of possible flat panel or other image sources, to write onto a reflective photoactivated light valve.
The flat panel displays may be transmissive, reflective, or self-emissive with shuttering.
Alternatively, self-emissive displays such as CRT displays, for example, may be used.
A novel aspect of the present invention is that each video frame is divided equally among the display sources (AMLCD/flat panel displays, for example) either spatially or temporally, and the displays are optomechanically multiplexed or optically shuttered, thus imaging the partial frames of information sequentially or simultaneously onto the photoactivated light valve, or directly on the viewing screen
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Optical Systems 
