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:
Mar. 13, 2012
Filed:
Dec. 09, 2009
Applicant:
Göran Anders Johansson, San Francisco, CA (US);
Inventor:
Göran Anders Johansson, San Francisco, CA (US);
Assignee:
Carl Zeiss Meditec, Inc., Dublin, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B 3/02 (2006.01); A61B 3/10 (2006.01); A61B 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Embodiments of the present invention include approaches for controlling light valve devices to improve the range and precision of the contrast ratio and the grayscale levels of a display used for visual field tests. In one embodiment, two or more illumination devices are used to enable the display device to display a wide range of contrast stimuli at precise illumination intensities over a fixed background illumination level. In another embodiment, the gamma curves of the display elements are adjusted to allow greater variations in the brightness of the display.