The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 1989
Filed:
Mar. 24, 1988
Jean-Claude Deutsch, Grenoble, FR;
Commissariat a l'Energie Atomique, Paris, FR;
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.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile