Device for determining the contrast of a display screen as a fun

Details Device for determining the contrast of a display screen as a fun Device for determining the contrast of a display screen as a fun

1988-03-24

1989-09-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 136

Patent

active

048702633

ABSTRACT:
A device for determining the contrast of a display screen as a function of the observation direction. This device comprises a first convergent objective (12) for forming the image (19) of the Fourier transform of an elementary surface (9) of a screen (6) in the image focal plane (Fi) of the first objective, a second convergent objective (14) for projecting the image of the transform on to an array (16) of detectors (18) arranged in matrix-like manner, each detector producing an electric signal proportional to the light intensity from the elementary surface in accordance with a given observation direction and a diaphragm (20) in the vicinity of the second objective and whose aperture defines a surface, which must be equal to that of the elementary surface, as well as a computer for processing the electric signal produced by each detector in order to determine said contrast.

REFERENCES:
patent: 3750136 (1973-07-01), Roess
Barna; Review of Scientific Instruments; vol. 47, No. 10; Apparatus for Optical Characterization of Displays; Oct. 1976; pp. 1258-1260.
Japanese Patent Abstracts, vol. 7, No. 130, JP-A-58 47226 (Cannon KK); Mar. 1983.
Japanese Patent Abstracts, vol. 7, No. 278 JP-A-58-155328 (Daini Seisokosha), Sep. 1983.
Japanese Patent Abstracts, vol. 7, No. 23 JP-A-57-175937 (Hitachi Seisakusko), Apr. 1981.
Japanese Patent Abstracts, vol. 5, No. 191, JP-A-56-117106 (Dainippon Insatsu KK), Feb. 1980.

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