US 5,788,352 A · Multiplexed multi-image source display writing system

Abstract

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.

Claims16

Dependent claims

Projection display apparatus for providing an image on a display screen that has a predetermined display image resolution, said apparatus comprising:

first and second non-identical display sources for generating at least first and second images having predetermined image resolutions that when combined form a composite image having the predetermined display image resolution;
and
sequential imaging means for the opto-mechanical or electro-optical processing of the images derived from the display sources to produce the composite image having the predetermined display image resolution for display that is imaged onto the display screen further comprising:
a reflective photoactivated light valve disposed between the sequential imaging means and the display 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 display image resolution on the display screen.

3 more elements

Dependencies are inferred from the claim text.

Multiplexed multi-image source display writing system

Life of this patent

Multiplexed multi-image source display writing system

Life of this patent

Abstract

Claims16