Electroluminescent display and method of driving the same

A method of driving an electroluminescent display including

• a display panel in which sub-pixels which include a light emitting diode and a driving transistor, respectively to display an image and compensate a threshold voltage and an electron mobility of the driving transistor in compliance with a source-follower type internal compensation method are formed, and pixel lines are formed by the sub-pixels,
• a gate driver configured to drive scan signal lines formed on the display panel, and
• a data driver configured to drive data lines formed on the display panel, the method comprising:
• controlling operation of the gate driver and the data driver,
• while compensating sequentially the threshold voltage and the electron mobility of the driving transistor in a unit of display block of the display panel,
• compensating simultaneously the threshold voltage of the driving transistor with respect to all the pixel lines belonging to a same display block, and then
• compensating sequentially the electron mobility of the driving transistor in a unit of pixel line in the same display block,
• wherein a source electrode of the driving transistor and an anode electrode of the light emitting diode are electrically floated during a period of compensating the threshold voltage and electron mobility of the driving transistor
• wherein the compensating sequentially steps further comprises:
• an initialization step during a first time period in which a first switching transistor is turned on to supply an offset voltage from a data line to a gate electrode of the driving transistor, and a second switching transistor is turned on to apply an initialization voltage to the source electrode of the driving transistor;
• a first threshold voltage compensation step of compensating a threshold voltage of the driving transistor during a second time period in which the first switching transistor is turned on to supply the offset voltage from the data line to the gate electrode of the driving transistor and the second switching transistor is turned off;
• a second threshold voltage compensation step during a third time period in which the first switching transistor and the second switching transistor are turned off so that the threshold voltage of the driving transistor is stored in a storage capacitor;
• a black data voltage writing step during a fourth time period in which the first switching transistor is turned on to write a black data voltage from the data line to the gate electrode of the driving transistor, and the second switching transistor is turned off;
• a data voltage writing and electron mobility compensation step during a fifth time period in which the first switching transistor is turned on to write the data voltage from the data line to the gate electrode of the driving transistor, and the second switching transistor is turned off, the data voltage compensating an electron mobility of the driving transistor;
• and
• a light emission step during a sixth time period in which the first and second switching transistors are turned off and a third switching transistor is turned on to cause the light emitting diode to emit light based on a driving current generated from the driving transistor,
• wherein the third switching transistor is turned off during at least one of the first to fifth time periods to prevent current leakage of the light emitting diode,
• wherein the electroluminescent display includes the driving transistor configured to generate the driving current depending on a gate-source voltage, the storage capacitor configured to store the data voltage and provide the stored data voltage to the gate electrode of the driving transistor, the first switching transistor configured to control a gate potential of the driving transistor, the second switching transistor configured to control a source potential of the driving transistor, the light emitting diode configured to emit light in response to the driving current generated from the driving transistor, and the third switching transistor configured to electrically float the source electrode of the driving transistor and the anode electrode of the light emitting diode.

A method of driving an electroluminescent display, comprising:

• an initialization step during a first time period in which a first switching transistor is turned on to supply an offset voltage from a data line to a gate electrode of a driving transistor, and a second switching transistor is turned on to apply an initialization voltage to a source electrode of the driving transistor;
• a first threshold voltage compensation step of compensating a threshold voltage of the driving transistor during a second time period in which the first switching transistor is turned on to supply an offset voltage from the data line to the gate electrode of the driving transistor and the second switching transistor is turned off;
• a second threshold voltage compensation step during a third time period in which the first switching transistor and the second switching transistor are turned off so that the threshold voltage of the driving transistor is stored in a storage capacitor;
• a black data voltage writing step during a fourth time period in which the first switching transistor is turned on to write a black data voltage from the data line to the gate electrode of the driving transistor, and the second switching transistor is turned off;
• a data voltage writing and electron mobility compensation step during a fifth time period in which the first switching transistor is turned on to write the data voltage from the data line to the gate electrode of the driving transistor, and the second switching transistor is turned off, the data voltage compensating an electron mobility of the driving transistor;
• and
• a light emission step during a sixth time period in which the first and second switching transistors are turned off and a third switching transistor is turned on to cause a light emitting diode to emit light based on a driving current generated from the driving transistor,
• wherein the third switching transistor is turned off during at least one of the first to fifth time periods to prevent current leakage of the light emitting diode, wherein the electroluminescent display includes the driving transistor configured to generate the driving current depending on a gate-source voltage, the storage capacitor configured to store the data voltage and provide the stored data voltage to the gate electrode of the driving transistor, the first switching transistor configured to control a gate potential of the driving transistor, the second switching transistor configured to control a source potential of the driving transistor, the light emitting diode configured to emit light in response to the driving current generated from the driving transistor, and the third switching transistor configured to electrically float the source electrode of the driving transistor and an anode electrode of the light emitting diode.