Title:
有機EL素子用駆動装置および有機EL照明装置
Document Type and Number:
Japanese Patent JP4973814
Kind Code:
B2
Abstract:
An organic EL element driving device (20, 40) that drives an organic EL element (2) with a constant current and is capable of varying a value of the constant current in accordance with luminance control is provided. The organic EL element driving device includes a power supply (3) connected in series with the organic EL element, and a current control unit (4, 10) connected in series with the organic EL element. The current control unit includes a current detection circuit (9) having a resistor for detecting the value of the current passing through the organic EL element. The current control unit sets a prescribed value for the current to be passed through the organic EL element in accordance with the luminance control, and performs control such that the current passing through the organic EL element has the prescribed value in accordance with an output from the current detection circuit. A value of the resistor in the current detection circuit is varied in accordance with the luminance control.
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Inventors:
Tsukasa Yagi
Koichi Ishida
Yuichi Ikezu
Koji Miyawaki
Koichi Ishida
Yuichi Ikezu
Koji Miyawaki
Application Number:
JP2011548482A
Publication Date:
July 11, 2012
Filing Date:
June 13, 2011
Export Citation:
Assignee:
Konica Minolta Holdings Co., Ltd.
International Classes:
H05B37/02; H05B44/00
Domestic Patent References:
| JP2009026544A | 2009-02-05 | |||
| JP2005078828A | 2005-03-24 | |||
| JP2009261213A | 2009-11-05 | |||
| JP2007280559A | 2007-10-25 | |||
| JP2006121774A | 2006-05-11 |
Attorney, Agent or Firm:
Fukami patent office