| 摘要 |
An illumination device comprising an organic light-emitting diode ( 1 ) (OLED) having a light output that changes with use with an illumination/active area ( 2,3 ), where light is being emitted for an illumination purpose, a reference area ( 4 ) being substantially smaller than the illumination area ( 2 ), wherein the reference area ( 4 ) is an isolated area ( 4 ) not connected to the illumination/active area ( 2,3 ), a substrate, on which the reference area ( 4 ) and the illumination/active area ( 2,3 ) are located, a driver ( 5 ) connected to the illumination/active area ( 2,3 ) and the reference area ( 4 ), with a measurement circuit ( 6 ) detecting at least one active value of the illumination/active area ( 2,3 ) and at least one reference value of the reference area ( 4 ), a control circuit ( 7 ), which compares the active and the reference value and produces a correction signal in response thereto to compensate the changes in the light output of the illumination area ( 2 ), wherein the control circuit ( 7 ) calculates the correction signal for the illumination area ( 2 ) based on the active value and the reference value.
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