Organic light emitting display and driving method thereof
AssigneeSamsung Display Co., Ltd.
InventorOh-Kyong Kwon
Life of this patent
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Abstract
An organic light emitting display device includes: a plurality of pixels at crossing portions of data lines, scan lines, and emission control lines; a sensor for sensing degradation information of organic light emitting diodes and mobility information of driving transistors, which are included in each pixel; a converter for storing the degradation information of organic light emitting diodes and the mobility information of driving transistors, which are sensed utilizing the sensor and converting input data to corrected data by utilizing the stored information; and a data driver receiving the corrected data and generating data signals to be supplied.
Claims30
An organic light emitting display comprising:
- a plurality of pixels at crossing portions of data lines, scan lines, and emission control lines, each of the plurality of pixels comprising an organic light emitting diode for emitting light and a driving transistor for driving the organic light emitting diode;
- a sensor for sensing degradation information of the organic light emitting diodes and mobility information of the driving transistors;
- a converter for storing the degradation information of the organic light emitting diodes and the mobility information of the driving transistors and for converting input data to corrected data by utilizing the degradation information and the mobility information;
- and
- a data driver for receiving the corrected data output from the converter and for generating data signals utilizing the corrected data to be supplied to the plurality of pixels via the data lines;
- wherein the sensor comprises sensing circuits, wherein each sensing circuit corresponds to a corresponding one of the data lines;
- wherein each of the sensing circuits comprises:
- a current source unit for supplying a first current to a corresponding one of the plurality of pixels;
- a first current sink unit for sinking a second current from said corresponding one of the plurality of pixels;
- and
- a second current sink unit for sinking a third current from said corresponding one of the plurality of pixels.
A driving method of an organic light emitting display, the method comprising:
- a) generating a first voltage while supplying a first current to organic light emitting diodes included in a plurality of pixels;
- b) converting the first voltage to a first digital value and storing the first digital value in a memory;
- c) generating a second voltage while sinking a second current via driving transistors in the plurality of pixels;
- d) generating a third voltage while sinking a third current via the driving transistors in the plurality of pixels;
- e) converting information corresponding to a difference between the second voltage and the third voltage to a second digital value and storing the second digital value in the memory;
- f) converting input data to corrected data to display an image with substantially uniform luminance utilizing the first and second digital values stored in the memory irrespective of degradation of the organic light emitting diodes and mobility of the driving transistors;
- and
- g) providing data signals corresponding to the corrected data to data lines.
A driving method of an organic light emitting display, the method comprising:
- measuring voltage change across organic light emitting diodes in a plurality of pixels by utilizing a first current and storing the voltage change;
- sequentially sinking a second current and a third current via driving transistors in the plurality of pixels to measure a second voltage corresponding to the second current and a third voltage corresponding to the third current and to store a difference between the second voltage and the third voltage;
- converting input data to corrected data utilizing the voltage change and the difference between the second and third voltages to compensate for degradation of the organic light emitting diodes and a variance in mobility among the driving transistors;
- and
- applying data signals corresponding to the corrected data to the plurality of pixels during a display period and compensating for threshold voltages of the driving transistors in respective pixel circuits of the plurality of pixels through an initialization process.
Dependencies are inferred from the claim text.