Control method of brightness of screen used for projection displ

Details Control method of brightness of screen used for projection displ Control method of brightness of screen used for projection displ

1989-08-10

1990-10-23

Haroian, Harry N.

Optics: image projectors

Lamp control

G03B 220

Patent

active

049647199

ABSTRACT:
Brightness of a screen is detected on the basis of a luminous flux projected from a light source to the screen. This detection signal is fed back and a set value of brightness of the screen is compared with the detection signal. The magnitude of input power to the light source is controlled so that the comparison value becomes zero.

REFERENCES:
patent: 3833297 (1974-09-01), Swartz
patent: 4040047 (1977-08-01), Hareng et al.
patent: 4299451 (1981-11-01), Task
patent: 4825065 (1989-04-01), Imai

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