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:
Oct. 20, 2020
Filed:
Mar. 15, 2017
Sharp Kabushiki Kaisha, Sakai, Osaka, JP;
Shigetsugu Yamanaka, Sakai, JP;
SHARP KABUSHIKI KAISHA, Sakai, JP;
Abstract
Image data having parts that change in sine wave shape or cosine wave shape in the horizontal direction and the vertical direction is used as current measurement patterns. A current measuring unit measures current flowing in a power source line from all of organic EL elements included in a display unit. A current distribution pattern generating unit generates a current distribution pattern by performing a two-dimensional inverse discrete Fourier transform on a plurality of current values measured when the current measurement patterns are displayed in order. An image signal correcting unit corrects an image signal on the basis of the current distribution pattern and a cumulative added value of an image signal. Accordingly, the extent of performance degradation of the organic EL elements is estimated, and uneven brightness in the display screen is prevented.