Organic light emitting display and image compensating method thereof
AssigneeSamsung Display Co., Ltd.
InventorYang-Wan Kim
Life of this patent
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Abstract
An organic light emitting display device and a method of compensating image of the organic light emitting display device. The organic light emitting display device includes a sensing circuit that is separate from a pixel circuit to sense a current supplied by a driving transistor. Accordingly, mura, spots, or image sticking generated due to deterioration of the driving transistor may be compensated for.
Claims8
An organic light emitting display device comprising:
- a plurality of pixels, each of the pixels comprising:
- an organic light emitting diode;
- and
- a pixel circuit comprising a driving transistor for driving the organic light emitting diode and a switching transistor for switching a current flowing through the driving transistor in response to a sensing signal;
- and
- a sensing circuit for sensing the current, converting the current into sensing data, and performing mura correction and image compensation for image sticking based on the sensing data and a lookup table, wherein the lookup table is generated by comparing the sensing data with previously sensed sensing data,
- wherein the sensing circuit comprises:
- an analog-digital converting circuit for converting the current into the sensing data;
- a mura correction circuit for comparing the sensing data with original data provided from the pixel circuit to generate mura correction data;
- and
- an image compensating circuit for generating image compensation data to compensate for image sticking in accordance with the mura correction data and the lookup table
- wherein the sensing circuit further comprises a current source configured to provide a constant current at a front end of the analog-digital converting circuit.
An organic light emitting display device comprising:
- a plurality of pixels, each of the pixels comprising:
- an organic light emitting diode;
- a pixel circuit comprising a driving transistor for driving the organic light emitting diode, and a switching transistor for switching a current flowing through the driving transistor in response to a sensing signal;
- a current source for providing a current for adjusting a gate-source voltage of the driving transistor;
- an analog-digital converting circuit for converting the current into sensing data;
- a mura correction circuit for comparing the sensing data with original data provided from the pixel circuit to generate mura correction data;
- and
- an image compensating circuit for generating image compensation data to compensate for image sticking in accordance with the mura correction data and a lookup table, wherein the lookup table is generated by comparing the sensing data with previously sensed sensing data;
- wherein the current source is configured to provide a constant current at a front end of the analog-digital converting circuit.
A method of compensating for an image displayed by an organic light emitting display device comprising an organic light emitting diode and a pixel circuit comprising a driving transistor for driving the organic light emitting diode, the method comprising:
- providing a constant current for adjusting a gate-source voltage of the driving transistor;
- sensing a current supplied by the driving transistor and converting the current into sensing data;
- comparing the sensing data with original data to generate mura correction data;
- and
- generating image compensation data to compensate for image sticking of the organic light emitting display device in accordance with the mura correction data and a lookup table that is generated by comparing the sensing data with previously sensed sensing data.
Dependencies are inferred from the claim text.