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US 11,961,481 B2Granted
Integrated circuit for driving pixel of display panel, pixel driving device, and pixel defect detecting method
AssigneeLx Semicon Co., Ltd.
InventorsKyoung Tae Kim, Dong Hwan Kim
Life of this patent
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Abstract
The present disclosure relates to an integrated circuit, a pixel driving device and a pixel defect detecting method and provides a device and method to sense a voltage of a light emitting diode of a pixel through a data line and to compare the sensed voltage with a reference range, thereby determining a pixel defect.
Claims19
An integrated circuit comprising:
- a driving circuit configured to provide a data voltage to a pixel through a data line connected with the pixel of a panel, to sense a voltage of a light emitting diode of the pixel through the data line, and to compare the voltage of the light emitting diode with a reference voltage;
- and
- a detection circuit configured to receive, from the driving circuit, the comparison result between the voltage of the light emitting diode and at least one reference voltage and to determine a defect of the pixel on the basis of the received comparison result,
- wherein the driving circuit includes a first driving circuit and a second driving circuit comprising an amplifier, a first switch connected to an output terminal of the amplifier and a second switch connected with the detection circuit at the output terminal of the amplifier, respectively, and
- wherein the second switch of the first driving circuit and the second switch of the second driving circuit are connected to each other and to the detection circuit.
2 more elements
A pixel driving device comprising:
- an amplifier configured to provide a data voltage to a pixel through a data line connected with the pixel of a panel;
- and
- a first switch connected between the pixel and an output terminal of the amplifier, and
- a second switch connected to a detection circuit at the output terminal of the amplifier,
- wherein, while the first switch is closed, the amplifier receives a source voltage through a first input terminal thereof and provides the data voltage to the pixel through the data line connected to an output terminal thereof,
- wherein, while the first switch is open, the amplifier receives a reference voltage through the first input terminal thereof, receives the voltage of the light emitting diode included in the pixel sensed through the data line, through a second input terminal thereof, and outputs, to the output terminal, a comparison result between the reference voltage and the voltage of the light emitting diode,
- wherein, while the second switch is closed, the comparison result between the reference voltage and the voltage of the light emitting diode, outputted from the output terminal of the amplifier, is transmitted to the detection circuit through the second switch,
- wherein the pixel driving device includes a first driving circuit and a second driving circuit comprising the amplifier, the first switch and the second switch, respectively, and
- wherein the second switch of the first driving circuit and the second switch of the second driving circuit are connected to each other and to the detection circuit.
6 more elements
A pixel defect detecting method comprising:
- providing a data voltage to a pixel through an amplifier connected through a data line with the pixel of a display panel in a first time period;
- receiving, by the amplifier, a reference voltage and a voltage of a light emitting diode included in the pixel and outputting a comparison result between the reference voltage and the voltage of the light emitting diode in a second time period;
- and
- identifying a defect of the pixel on the basis of the comparison result between the reference voltage and the voltage of the light emitting diode,
- wherein a pixel driving device for detecting the pixel defect includes a first driving circuit and a second driving circuit comprising the amplifier, a first switch connected between the pixel and an output terminal of the amplifier, and a second switch connected to a detection circuit at the output terminal of the amplifier, respectively, and
- wherein the second switch of the first driving circuit and the second switch of the second driving circuit are connected to each other and to a detection circuit.
3 more elements
Dependencies are inferred from the claim text.