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. 27, 2005
Filed:
May. 01, 2003
Sachito Horiuchi, Kyoto, JP;
Noboru Kagemoto, Kyoto, JP;
Isao Yamamoto, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
An electronic apparatus includes a display device () and a drive device () for driving the display (). The display device () is equipped with light emitting elements () such as LEDs driven at high voltages. The display device () has a multiplicity of light emitting element series each supplied at one end thereof with a high voltage (Vh) higher than a given power supply voltage (Vdd). The drive device () has drivers () each having one end connected to a respective terminal to which a corresponding one of said multiple light emitting elements series is connected. The drivers are turned ON and OFF in accordance with instruction signals (SS) such that, when turned ON, they provide currents to the series connected. The drive device () also has a multiplicity of bypass current source () for providing the light emitting element series with currents not sufficient to activate the series for emission of light when corresponding drivers are turned OFF. The drive device can be constructed using ICs that are designed to operate at low voltages, thereby facilitating reduction of electric power loss by the electronic apparatus.