| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such a problem that luminance of an organic EL display device can not be controlled so that the entire image can be displayed brighter in accordance with the taste of a user or the environmental condition especially when the device is used outdoor during the daytime, and the image can be displayed darker in an indoor environment in the nighttime. <P>SOLUTION: The organic EL display device is provided with a first power supply 12 which is connected to thin film transistors 6 side and provides a positive power supply voltage and a second power supply 13 which is connected to EL elements 7 side and provides a negative power supply voltage and these power supplies are forcibly switched by a switch 10 or a sensor 11 detects the environmental condition of the surroundings and the luminance of the light emitting layer is totally adjusted by changing the positive power supply voltage of the power supply 12 so as to realize an organic EL display device that can display with a luminance suitable for the environment of the surroundings. <P>COPYRIGHT: (C)2004,JPO |
