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:
Feb. 19, 2008
Filed:
Apr. 27, 2005
Kazuhito Funae, Tokyo, JP;
Takuya Shibata, Hyogo, JP;
Kazuhito Funae, Tokyo, JP;
Takuya Shibata, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An initial driving voltage fixing a desired luminance of a light-emitting source is set at a voltage lower than that of a power supply; the light-emitting source is driven by applying a light-emitting source driving voltage at the initial driving voltage; and then, a CPU determines whether or not the power supply voltage has dropped down the initial driving voltage. When the power supply voltage has become lower than the initial driving voltage, the CPU applies the light-emitting source driving voltage to the source at the power supply voltage, and holds an undervoltage information of the power supply that the power supply voltage has dropped. When the CPU detennined that the power supply voltage had returned higher than or equal to the initial driving voltage after holding the undervoltage information, the CPU gradually returns the light-emitting source driving voltage to the initial driving voltage.