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Title:
有機EL素子点灯装置及びそれを備えた発光モジュール並びに照明器具
Document Type and Number:
Japanese Patent JP5244053
Kind Code:
B2
Abstract:

To exclude brightness dispersion due to the temperature variation of an organic EL element, by controlling the electric current supplied to the organic EL element, according to the variation in the voltage across both electrodes of the organic EL element in an organic EL element lighting device.

The lighting device 1 includes a control circuit 6 for controlling the electric current supplied to a lamp part 10 having the organic EL element, and a voltage and current detecting part 4 for detecting the voltage across the both electrodes of the organic EL element of the lamp part 10. When a voltage value detected by the voltage and current detecting part 4 exceeds a set voltage value, an element temperature is low and the brightness is low, and the control circuit 6 increases the current supplied to the organic EL element so as to increase the brightness. When the detected voltage value is lower than the set voltage value, the element temperature is high and the brightness is high, and the electric current supplied to the organic EL element is reduced and the brightness is reduced.

COPYRIGHT: (C)2011,JPO&INPIT


Inventors:
Hiroshi Konishi
Shohei Yamamoto
Kentaro Yamauchi
Masao Okawa
Application Number:
JP2009196098A
Publication Date:
July 24, 2013
Filing Date:
August 26, 2009
Export Citation:
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Assignee:
Panasonic Corporation
International Classes:
H05B44/00; F21S2/00; H01L51/50; H05B37/02; F21Y105/00
Domestic Patent References:
JP2006150601A
JP2008041650A
JP2007536708A
JP2005329636A
JP2009070743A
JP2005134531A
JP2009152010A
Attorney, Agent or Firm:
Yasuo Itaya
Katsumi Taguchi
Shinichi Mizuta