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US 7,064,773 B1Granted
Display apparatus
AssigneeCanon Kabushiki Kaisha
InventorsAtsushi Okuyama, Makoto Matsuura, Akihiro Ouchi, Hiroyuki Kodama
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Abstract
A display apparatus is constructed to make a plurality of light beams of mutually different colors incident to a display element and modulate the beams of the respective colors by the display element to form images of the respective colors. Purity of a predetermined color out of the colors is variable and a control pattern of the image display element is modified according to variation in the purity of the predetermined color.
Claims10
An image display apparatus comprising:
- a color-separating optical system for separating light from a light source into a first color light beam, a second color light beam, and a third color light beam, which are different in color from one another;
- a first display element for modulating the first color light beam to form an image of the first color;
- a second display element for modulating the second color light beam to form an image of the second color;
- a second display element for modulating the second color light beam to form an image of the second color;
- a third display element for modulating the third color light beam to form an image of the third color;
- a drive circuit for driving said first display element with a first image signal corresponding to the first color, said second display element with a second image signal corresponding to the second color, and said third display element with a third image signal corresponding to the third color;
- and
- a filter that is adapted to be moved into or ourt of an optical path of the first color, wherein purity of the first color is rendered a first purity when the filter is off the optical path of the first color, and purity of the first color is rendered a second purity that is higher than the first purity when the filter is in the optical path of the first color, wherein said drive circuit drives said second display element with said second image signal when said filter is in the optical path of the first color and said drive circuit drives said second display element with a signal produced by adding a signal produced based on said first image signal to said second image signal when said filter is off the optical path of the first color.
5 more elements
Dependencies are inferred from the claim text.