Image display apparatus and method of driving same

1. An image display apparatus comprising:

a light emitting element;

a driver that includes at least a first terminal and a second terminal, and controls the light emitting element based on a potential difference applied between the first terminal and the second terminal;

a storage capacitor having a first electrode and a second electrode which is electrically connected to the driver, the storage capacitor serving to retain a potential of the first terminal of the driver;

a current source that flows through the driver, a data current corresponding to a display in a black level in order to set a voltage across the first and the second terminals of the driver to a first voltage;

a controller that controls a potential of the first electrode of the storage capacitor to change the voltage across the first and the second terminals of the driver from the first voltage to a second voltage, the second voltage being different from the first voltage; and

a writing control line that is connected to the first electrode of the storage capacitor,

wherein the light emitting element emits light based on the second voltage;

wherein the writing control line is commonly connected to all pixels; and

wherein the potential difference δV r is represented by an expression (2·i base /1.1β L ) 1/2 ≦δV r ≦(2·i base /0.9β L ) 1/2 , where i base is the amount of electric current applied at the data writing corresponding to the display in the black level, and β L is a value in proportion to mobility of the driver in each pixel.

2. The image display apparatus according to claim 1 , wherein the controller changes a potential of the first electrode of the storage capacitor through the writing control line.

3. The image display apparatus according to claim 1 , wherein the driver is an n-type transistor, and the potential of the first electrode of the storage capacitor is higher than a potential of the first electrode of the storage capacitor.

4. The image display apparatus according to claim 1 , wherein the driver is a p-type transistor, and the potential of the first electrode of the storage capacitor is lower than a potential electrode of the storage capacitor.

5. The image display apparatus according to claim 1 , wherein a potential difference δV r between the potential of the writing control line at light emission by the light emitting element and the potential of the writing control line at writing of the electric data current corresponding to the display in the black level, where the potential difference δV r is substantially same in all pixels.

6. The image display apparatus according to claim 1 , wherein the light emitting element is an organic light-emitting diode.

7. The image display apparatus according to claim 1 , wherein the driver is of a current mirror structure.

8. The image display apparatus according to claim 1 , wherein the data current corresponding to the display in the black level, which is supplied by the current source, does not pass through the light emitting element.

9. An image display apparatus comprising:

a light emitting element that emits light depending on an injected electric current;

a driver that includes at least a first terminal and a second terminal, and controls the light emitting element based on a potential difference, applied between the first terminal and the second terminal, of a level higher than a predetermined threshold;

a storage capacitor that serves to retain a potential on the first terminal of the driver;

a controller that changes the potential on the first terminal via the storage capacitor at writing of electric data current corresponding to a display in a black level;

a writing control line that is connected to one end of the storage capacitor; and

wherein the writing control line is commonly connected to all pixels,

wherein the potential difference δV r is represented by an expression (2i base /1.5β ave ) 1/2 <=δV r <=(2i base /0.5β ave ) 1/2 , where i base is the amount of electric current applied at the data writing corresponding to the display in the black level, and β ave is an average value of values in proportion to mobility of the driver in each pixel.

10. An image display apparatus comprising:

a light emitting element that emits light depending on an injected electric current;

a driver that includes at least a first terminal and a second terminal, and controls the light emitting element based on a potential difference, applied between the first terminal and the second terminal, of a level higher than a predetermined threshold;

a storage capacitor that serves to retain a potential on the first terminal of the driver;

a controller that changes the potential on the first terminal via the storage capacitor at writing of electric data current corresponding to a display in a black level; and

a writing control line that is connected to one end of the storage capacitor;

wherein the writing control line is separately connected to each pixel,

wherein a potential difference δV r between the potential on the writing control line at light emission of the light emitting element and the potential on the writing control line at writing of electric data current corresponding to the display in the black level is different value for each pixel, and

wherein the potential difference δV r is represented by an expression (2i base /1.5β L ) 1/2 <=δV r <=(2i base /0.5β L ) 1/2 , where i base is the amount of electric current applied at the data writing corresponding to the display in the black level, and β L is an average value of values in proportion to mobility of the driver in each pixel.

11. An image display apparatus comprising:

a light emitting element

a driver that includes at least a first terminal and a second terminal, and controls the light emitting element based on a potential difference, applied between the first terminal and the second terminal;

a storage capacitor having a first electrode and a second electrode which is electrically connected to the driver, the storage capacitor serving to retain a potential of the first terminal of the driver;

a current source that flows through the driver, a data current corresponding to a display in a black level in order to set a voltage across the first and the second terminals of the driver to a first voltage;

a controller that controls a potential of the first electrode of the storage capacitor to change the voltage across the first and the second terminals from the first voltage to a second voltage which is different from the first voltage; and

a writing control line that is connected to the first electrode of the storage capacitor,

wherein the light emitting element emits light based on the second voltage;

wherein the writing control line is separately connected to each pixel;

wherein a potential difference δV r between the potential of the writing control line at light emission of the light emitting element in the previous process and the potential on the writing control line at writing of electrical-data current corresponding to the display in the black level is different value for each pixel; and

wherein the potential difference δV r is represented by an expression (2·i base /1.1β L ) 1/2 ≦δV r ≦(2·i base /0.9β L ) 1/2 , where i base is the amount of electric current applied at the data writing corresponding to the display in the black level, and β L is an average value of values in proportion to mobility of the driver in each pixel.