Organic light emitting display, and method for driving organic light emitting display and pixel circuit

A method for driving an organic light emitting display, the organic light emitting display including a scan driver for supplying a scan signal to a plurality of scan lines, a data driver for applying differing analog data voltages corresponding to differing luminance to a plurality of data lines, and a pixel portion comprising a plurality of pixels for displaying an image according to the scan signal supplied to the plurality of scan lines and according to the differing analog data voltages applied to the plurality of data lines, the differing analog data voltages for controlling corresponding said differing luminance of the plurality of pixels, the method comprising:

• (a) sequentially supplying the scan signal to the plurality of scan lines, and applying the differing analog data voltages to the plurality of data lines during a light emitting period;
• and
• (b) sequentially supplying the scan signal to the plurality of scan lines, and applying a predetermined voltage to the plurality of data lines during each of two contiguous non-light emitting periods to improve a uniformity of a same luminance among respective ones of the plurality of pixels of the organic light emitting display device to which a same one of the analog data voltages is being applied,
• wherein the applying of the predetermined voltage further comprises applying the predetermined voltage to improve a differentiation of the same luminance among the respective ones of the plurality of pixels from different luminance among all others of the plurality of pixels to which different ones of the analog data voltages are being applied.

A method for driving a plurality of pixel circuits by differing analog data voltages for generating corresponding differing currents corresponding to differing luminance during one frame, each of the plurality of pixel circuits including a first transistor for applying an analog data voltage of the differing analog data voltages to a data line according to a scan signal supplied to a scan line, a capacitor for storing a voltage corresponding to the applied analog data voltage, and a second transistor for applying a current of the differing currents corresponding to the voltage stored in the capacitor to an organic light emitting diode and for driving the organic light emitting diode to a corresponding luminance of the differing luminance, the one frame including at least one light emitting sub-frame and at least two non-light emitting sub-frames, the method comprising:

• during the at least one light emitting sub-frame, for each of the plurality of pixel circuits:
• storing a first voltage in the capacitor corresponding to a first analog data voltage from among the differing analog data voltages being applied to the data line while the scan signal is supplied to the scan line;
• and
• applying a first current of the differing currents corresponding to the first voltage stored in the capacitor to the organic light emitting diode to output a first luminance of the differing luminance corresponding to the first analog data voltage;
• during a first of the at least two non-light emitting sub-frames, for each of the plurality of pixel circuits:
• storing a second voltage in the capacitor corresponding to a black gradation voltage being applied to the data line while the scan signal is supplied to the scan line;
• and
• applying a second current corresponding to the second voltage stored in the capacitor to the organic light emitting diode to improve a uniformity of the first luminance of the organic light emitting diode connected to respective ones of the plurality of pixel circuits to which the first analog data voltage is being applied,
• wherein the applying of the second current during the first of the at least two non-light emitting sub-frames comprises applying the second current to improve a differentiation of the first luminance of the organic light emitting diode connected to the respective ones of the plurality of pixel circuits from different luminance of the organic light emitting diode connected to all others of the plurality of pixel circuits to which different ones of the analog data voltages are being applied;
• and
• during a second of the at least two non-light emitting sub-frames, for each of the plurality of pixel circuits:
• storing the second voltage in the capacitor corresponding to the black gradation voltage being applied to the data line while the scan signal is supplied to the scan line;
• and
• applying the second current corresponding to the second voltage stored in the capacitor to the organic light emitting diode to further improve the uniformity of the first luminance of the organic light emitting diode connected to the respective ones of the plurality of pixel circuits to which the first analog data voltage is being applied,
• wherein the applying of the second current during the second of the at least two non-light emitting sub-frames further comprises applying the second current to further improve the differentiation of the first luminance of the organic light emitting diode connected to the respective ones of the plurality of pixel circuits from the different luminance of the organic light emitting diode connected to all the others of the plurality of pixel circuits to which the different ones of the analog data voltages are being applied.