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. 24, 2012
Filed:
May. 25, 2007
Shintaro Nagasaki, Azumino, JP;
Shintaro Nagasaki, Azumino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A display device having an electrophoretic display panel that has two types of electrophoretic elements of different color and polarity disposed between electrodes, and changes display state according to an applied voltage, and a drive means for driving the electrophoretic display panel by applying a voltage between the electrodes. The drive means has a storage means for storing color transition information correlating the color levels displayed by the electrophoretic elements to the color level that is displayed when a positive pulse is applied and the color level that is displayed when a negative pulse is applied to the electrode connected to the electrophoretic elements displaying a particular color level; a target value setting means for setting as a target value the color level to be displayed by the electrophoretic elements; and a pulse applying means for applying a pulse of a specific voltage level to the electrode at least until a current value denoting the current color level of the electrophoretic elements matches the target value. The pulse applying means has a value determination unit for determining if the current value and the target value match, a pulse application unit for applying either a positive pulse or a negative pulse to the electrode so that the current value approaches the target value if the value determination unit determines the current value and the target value do not match, a transition value acquisition unit for getting from the color transition information a transition value denoting the color level after the pulse is applied, and a current value updating unit for updating the current value to the transition value.