DC-DC CONVERTER, ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE INCLUDING THE SAME, AND METHOD OF DRIVING THE ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE
First Claim
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1. An organic electroluminescent display device comprising:
- a pixel unit comprising a plurality of scan lines arranged in a row direction, a plurality of data lines arranged in a column direction, and a plurality of pixels formed at intersections between the plurality of scan lines and the plurality of data lines;
a power supply unit to generate and to output a direct current (DC) power supply from an external power source; and
a DC-DC converter to receive the DC power supply from the power supply unit, to generate a first power supply voltage and a second power supply voltage, and to supply the first power supply voltage and the second power supply voltage to the pixel unit,wherein the DC-DC converter comprises;
a boost converter to receive the DC power supply from the power supply unit and to generate the first power supply voltage;
a buck-boost converter to receive the DC power supply from the power supply unit and to generate the second power supply voltage; and
an output control unit to measure a temperature of the DC-DC converter, to compare the temperature of the DC-DC converter with a reference temperature, to stop output of the first power supply voltage of the boost converter and the second power supply voltage of the buck-boost converter if the temperature of the DC-DC converter is equal to or greater than the reference temperature, and to maintain a state where the output of the first and second power supply voltages are stopped.
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Abstract
A direct current (DC)-DC converter for preventing ignition and destruction of an organic electroluminescent display device by not driving the current when a parameter of the organic electroluminescent display device is abnormal, an organic electroluminescent display device including the DC-DC converter, and a method of driving the organic electroluminescent display device.
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Citations
20 Claims
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1. An organic electroluminescent display device comprising:
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a pixel unit comprising a plurality of scan lines arranged in a row direction, a plurality of data lines arranged in a column direction, and a plurality of pixels formed at intersections between the plurality of scan lines and the plurality of data lines; a power supply unit to generate and to output a direct current (DC) power supply from an external power source; and a DC-DC converter to receive the DC power supply from the power supply unit, to generate a first power supply voltage and a second power supply voltage, and to supply the first power supply voltage and the second power supply voltage to the pixel unit, wherein the DC-DC converter comprises; a boost converter to receive the DC power supply from the power supply unit and to generate the first power supply voltage; a buck-boost converter to receive the DC power supply from the power supply unit and to generate the second power supply voltage; and an output control unit to measure a temperature of the DC-DC converter, to compare the temperature of the DC-DC converter with a reference temperature, to stop output of the first power supply voltage of the boost converter and the second power supply voltage of the buck-boost converter if the temperature of the DC-DC converter is equal to or greater than the reference temperature, and to maintain a state where the output of the first and second power supply voltages are stopped. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A DC-DC converter comprising:
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a boost converter to receive a DC power supply from a power supply unit and to generate a first power supply voltage; a buck-boost converter to receive the DC power supply from the power supply unit and to generate a second power supply voltage; and an output control unit to measure a temperature of the DC-DC converter, to compare the temperature with a reference temperature, to stop output of the first power supply voltage of the boost converter and the second power supply voltage of the buck-boost converter if the temperature is equal to or greater than the reference temperature, and to maintain a state where the output of the first and second power supply voltage is stopped. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of driving an organic electroluminescent display device comprising a power supply unit for generating a DC power supply from an external power source and supplying the DC power supply to a DC-DC converter and the DC-DC converter for converting the DC power supply into a first power supply voltage and a second power supply voltage and supplying the first power supply voltage and the second power supply voltage to a plurality of pixels, the method comprising:
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receiving the DC power supply from the power supply unit and generating the first power supply voltage and the second power supply voltage; detecting a temperature of the DC-DC converter; comparing the temperature with a reference temperature; stopping output of the first power supply voltage and the second power supply voltage if the temperature is equal to or greater than the reference temperature; and maintaining a state where the output of the first power supply voltage and the second power supply voltage is stopped until the DC-DC converter is reset. - View Dependent Claims (20)
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Specification