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. 19, 1995
Filed:
Apr. 12, 1993
Terho Harju, Lohja as., FI;
Planar International Oy Ltd., Espoo, FI;
Abstract
The invention concerns a method and device for driving an electroluminescence matrix display. According to the method succeeding images are formed on the display (1), whereby to form one image all the row electrodes (r1-r6) of the display are scanned through one by one with a constant voltage, and a column voltage corresponding to the desired instantaneous combination of luminance levels is formed for the column electrodes (c1-c2) in synchronism with the scanning of the row electrodes (r1-r6). According to the invention a voltage corresponding to the average modulation voltage (AV) of the column electrodes (c1-c6) is connected to at least a part of the non-selected row electrodes (r1-r6) to capacitively raise the column electrodes (c1-c6) by the amount of the average modulation level, and only the required column electrodes (c1-c6) are driven to the difference voltage in reference to the average modulation voltage (AV).