Display apparatus with a variable aperture stop means on each side of the modulator
First Claim
1. A display apparatus comprising:
- a light source;
a modulating device for modulating light emitted from said light source;
first aperture stop means, arranged between said light source and said modulating device, for limiting a bundle of rays to be incident on said modulating device from said light source, said first aperture stop means having an aperture with a variable size;
a display screen onto which exit light from said modulating device is projected;
a projection optical system for projecting the exit light from said modulating device onto said display screen;
second aperture stop means, arranged between said modulating device and said projection optical system, for limiting a bundle of rays to be incident on said projection optical system from said modulating device, said second aperture stop means having an aperture with a variable size;
aperture control means for controlling the size of the aperture of at least one of said first and second aperture stop means; and
liquid crystal driving means for supplying to said modulating device a picture signal controlled on the basis of the size of the aperture, which is controlled by said aperture control means, of at least one of said first and second aperture stop means.
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Accused Products
Abstract
A display apparatus includes a light source, a modulating device for modulating light emitted from the light source, a modulating device driving unit for driving the modulating device, a first aperture stop unit arranged between the light source and the modulating device to limit a bundle of rays to be incident on the modulating device from the light source, the first aperture stop unit having an aperture with a variable size, a display screen onto which exit light from the modulating device is projected, a projection optical system for projecting the exit light from the modulating device onto the display screen, a second aperture stop unit arranged between the modulating device and the projection optical system to limit a bundle of rays to be incident on the projection optical system from the modulating device, the second aperture stop unit having an aperture with a variable size, a photosensor for detecting the display luminance on the display screen, and an aperture control unit for controlling the size of the aperture of at least one of the first and second aperture stop units on the basis of a display luminance signal from the photosensor.
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Citations
11 Claims
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1. A display apparatus comprising:
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a light source; a modulating device for modulating light emitted from said light source; first aperture stop means, arranged between said light source and said modulating device, for limiting a bundle of rays to be incident on said modulating device from said light source, said first aperture stop means having an aperture with a variable size; a display screen onto which exit light from said modulating device is projected; a projection optical system for projecting the exit light from said modulating device onto said display screen; second aperture stop means, arranged between said modulating device and said projection optical system, for limiting a bundle of rays to be incident on said projection optical system from said modulating device, said second aperture stop means having an aperture with a variable size; aperture control means for controlling the size of the aperture of at least one of said first and second aperture stop means; and liquid crystal driving means for supplying to said modulating device a picture signal controlled on the basis of the size of the aperture, which is controlled by said aperture control means, of at least one of said first and second aperture stop means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification