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US 7,460,092 B2Granted
Organic electroluminescent display and driving method thereof
AssigneeSamsung SDI Co., Ltd.
InventorsWong-Sik Choi, Sung-Chon Park
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Abstract
An organic electroluminescent display and a driving method thereof are provided, in which the temperature of a panel may be sensed, a power supply voltage corresponding to the sensed temperature may be generated and supplied to a driving transistor. The present invention may provide constant power consumption and brightness even at high temperature by supplying an appropriate power supply voltage that corresponds to the temperature.
Claims18
An organic electroluminescent display, comprising:
- a panel including a plurality of data lines, a plurality of scan lines crossing the data lines, and a plurality of pixel circuits that are located at areas approximately corresponding to places where the data lines and scan lines cross and that have organic electroluminescent elements;
- a scan driver for applying scan signals to the scan lines;
- a data driver for applying data voltages corresponding to gray data to the data lines;
- a temperature sensor for sensing the temperature of the panel;
- and
- a power supply voltage generator for generating a power supply voltage corresponding to the temperature sensed by the temperature sensor, and supplying it to the pixel circuit of the panel,
- wherein the power supply voltage generator comprises:
- a DC/DC converter for receiving a DC power supply voltage, converting it into a first power supply voltage for driving the pixel circuit, and outputting the first power supply voltage;
- a voltage controller for receiving the first power supply voltage output by the DC/DC converter, and converting it into a second power supply voltage to be supplied to the pixel circuit;
- and
- a controller for controlling the voltage controller to output the second power supply voltage according to the temperature of the panel.
8 more elements
A method for driving an organic electroluminescent display, comprising:
- sensing a temperature of the organic electroluminescent display including a driving transistor for outputting a current corresponding to a first power supply voltage applied to a first terminal and a data voltage applied to a second terminal, and an organic electroluminescent element for emitting light corresponding to the output current of the driving transistor;
- and
- supplying a voltage corresponding to the temperature as a first power supply voltage,
- wherein supplying a voltage comprises:
- receiving a DC power supply voltage;
- converting the DC power supply voltage into a first power supply voltage and a second power supply voltage;
- providing the first power supply voltage and second power supply voltage as selectable outputs;
- and
- selecting either the first power supply voltage or the second power supply voltage based on the temperature.
6 more elements
Dependencies are inferred from the claim text.