Display apparatus with a variable aperture stop means on each si

Details Display apparatus with a variable aperture stop means on each si Display apparatus with a variable aperture stop means on each si

1995-06-07

1996-05-21

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 49, G02F 11335

Patent

active

055195180

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.

REFERENCES:
patent: 4537481 (1985-08-01), Witty
patent: 4806964 (1989-02-01), Tamada
patent: 5083854 (1992-01-01), Zampolin
patent: 5260815 (1993-11-01), Takizawa
patent: 5381252 (1995-01-01), Chen

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