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:
Jul. 14, 1998
Filed:
Feb. 18, 1997
Nippondenso Co., Ltd., Kariya, JP;
Abstract
Method of driving a matrix-addressed electroluminescent device without deteriorating it. A display data driving voltage is applied to the column electrodes. A line scanning driving voltage is applied to the row electrodes successively. Before the display data driving voltage ceases, the line scanning driving voltage applied to the row electrode acting as a common electrode for all electroluminescent cells in one column is turned off. Thus, these cells are deactivated almost simultaneously. Electric charges remaining on the electro-luminescent cells in this row do not induce spike voltages on other electroluminescent cells. Therefore, deterioration of the electroluminescent cells is prevented. Electric charges produced when the row electrode-driving voltage is turned off flow directly into a power supply for the row electrodes. This power supply is designed to absorb the flowing charges. The potential is prevented from exceeding the power voltage. This protects the row electrode-driving power supply against destruction.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile