DC-DC converter, organic electroluminescent display device including the same, and method of driving the organic electroluminescent display device
First Claim
Patent Images
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 comprising a first capacitor having a first terminal electrically connected to a first power supply voltage output terminal and a second terminal;
a buck-boost converter to receive the DC power supply from the power supply unit and to generate the second power supply voltage comprising a second capacitor having a first terminal electrically connected to a second power supply voltage output terminal and a second terminal electrically connected to the second terminal of the first capacitor such that the first power supply is coupled to the second power supply through the first and second capacitors; 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.
36 Citations
18 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 comprising a first capacitor having a first terminal electrically connected to a first power supply voltage output terminal and a second terminal; a buck-boost converter to receive the DC power supply from the power supply unit and to generate the second power supply voltage comprising a second capacitor having a first terminal electrically connected to a second power supply voltage output terminal and a second terminal electrically connected to the second terminal of the first capacitor such that the first power supply is coupled to the second power supply through the first and second capacitors; 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)
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9. 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 comprising a first capacitor having a first terminal electrically connected to a first power supply voltage output terminal and a second terminal; a buck-boost converter to receive the DC power supply from the power supply unit and to generate a second power supply voltage comprising a second capacitor having a first terminal electrically connected to a second power supply voltage output terminal and a second terminal electrically connected to the second terminal of the first capacitor such that the first power supply is coupled to the second power supply through the first and second capacitors; 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 (10, 11, 12, 13, 14, 15, 16)
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17. 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 utilizing a boost converter and the second power supply voltage utilizing a buck-boost converter; 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, wherein;
the boost converter comprises a first capacitor having a first terminal electrically connected to a first power supply voltage output terminal and a second terminal, andthe buck-boost converter comprises a second capacitor having a first terminal electrically connected to the second power supply voltage output terminal and a second terminal electrically connected to the second terminal of the first capacitor such that the first power supply is coupled to the second power supply through the first and second capacitors. - View Dependent Claims (18)
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Specification