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:
May. 22, 2012
Filed:
Oct. 28, 2008
Sungcheon Park, Yongin-si, KR;
Choonyul OH, Yongin-si, KR;
Kyoungsoo Lee, Yongin-si, KR;
Samsung Mobile Display Co., Ltd., Yongin, KR;
Abstract
An organic light emitting display keeps a constant grayscale in an organic light emitting display panel even if power supplied by a power supply is changed. The organic light emitting display includes: a switching unit for selecting and outputting a first source power or a second source power as a first reference power; a comparator for comparing the first reference power with the second source power and outputting a difference value between the first reference power and the second source power; an adder for adding the difference value to an initial second reference power to output as a second reference power, such that a voltage level of the second reference power is changed when a voltage level of the first reference power is changed; and a gamma voltage generator for generating plural gamma voltages to be utilized for displaying the image on an organic light emitting display panel by utilizing the first and second reference powers.