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:
Nov. 14, 2023
Filed:
Oct. 28, 2022
Lapis Technology Co., Ltd., Yokohama, JP;
Yukinobu Watanabe, Yokohama, JP;
LAPIS TECHNOLOGY CO., LTD., Yokohama, JP;
Abstract
In the present invention, output circuits are connected to respective external terminals. Each output circuit includes an operational amplifier that outputs a current to one external terminal until a voltage of the external terminal becomes equal to a gradation voltage received by an input terminal thereof, and a disconnection detection circuit that detects whether a wiring connected to the one external terminal is disconnected or not. The disconnection detection circuit supplies a test voltage instead of the gradation voltage to the input terminal of the operational amplifier in a non-display period and measures a time period taken from then until the voltage of the one external terminal exceeds a reference voltage as a rise time. The disconnection detection circuit detects whether the wiring connected to the one external terminal is disconnected or not based on the rise time measured in one frame and the rise time measured in another frame.