Organic light emitting display device and driving method thereof
AssigneeSamsung Display Co., Ltd.
InventorHyeon-Ja Jo
Life of this patent
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Abstract
An organic light emitting display device includes pixels each including a driving transistor and an organic light emitting diode, and a sensing unit configured to extract threshold voltage information of the driving transistor and degradation information of the organic light emitting diode from each of the pixels, wherein the sensing unit includes a conversion unit configured to convert pixel current supplied from a respective one of the pixels into a first voltage, and configured to convert a reference current from a current source into a second voltage, and a comparison unit configured to calculate a difference between the first voltage and the second voltage, and configured to output a comparison voltage corresponding to the difference.
Claims17
An organic light emitting display device comprising:
- pixels each comprising a driving transistor and an organic light emitting diode;
- and
- a sensing unit configured to extract threshold voltage information of the driving transistor and degradation information of the organic light emitting diode from each of the pixels,
- wherein the sensing unit comprises:
- a conversion unit configured to convert pixel current supplied from a respective one of the pixels into a first voltage, and configured to convert a reference current from a current source into a second voltage;
- and
- a comparison unit configured to calculate a difference between the first voltage and the second voltage, and configured to output a comparison voltage corresponding to the difference.
A method of driving an organic light emitting display device, the method comprising:
- converting reference current from a current source into a second voltage;
- converting pixel current, which is supplied via an organic light emitting diode and a driving transistor in a pixel, into a first voltage according to a reference data signal;
- converting a comparison voltage, which corresponds to a difference between the first and second voltages, into a digital value;
- and
- using the digital value to generate a second data by changing bits of an externally supplied first data.
Dependencies are inferred from the claim text.