Image display device and method of controlling the same

1. An image display device, comprising:

a luminescence element that has a first electrode and a second electrode;

a first capacitor that has a first electrode and a second electrode, and holds a capacitor voltage;

a driver that has a drain electrode, a gate electrode connected to the first electrode of the first capacitor, and a source electrode connected to the first electrode of the luminescence element, and causes the luminescence element to emit light by applying a drain current corresponding to the capacitor voltage held by the first capacitor to the luminescence element;

a second capacitor that has a first electrode connected to the second electrode of the first capacitor and a second electrode;

a first power source line for determining a potential of the drain electrode of the driver;

a second power source line electrically connected to the second electrode of the luminescence element;

a third power source line for supplying a first reference voltage to the first electrode of the first capacitor;

a fourth power source line for supplying a second reference voltage to the second electrode of the second capacitor;

a data line for supplying a signal voltage to the second electrode of the first capacitor;

a first switch between the third power source line and the first electrode of the first capacitor for supplying the first reference voltage to the first electrode of the first capacitor;

a second switch between the data line and the second electrode of the first capacitor for supplying the signal voltage to the second electrode of the first capacitor;

a third switch between the first electrode of the luminescence element and the second electrode of the first capacitor for connecting the first electrode of the luminescence element and the second electrode of the first capacitor; and

a controller for controlling the first switch, the second switch, and the third switch,

wherein the controller:

causes the first capacitor to hold the capacitor voltage corresponding to the signal voltage by switching ON the first switch and the second switch while the third switch is switched OFF; and

switches OFF the first switch and the second switch to switch ON the third switch after the capacitor voltage corresponding to the signal voltage is held by the first capacitor, and

wherein the second capacitor stores a source potential of the driver while the third switch is switched ON.

2. The image display device according to claim 1 , wherein the first electrode of the luminescence element is an anode electrode, the second electrode of the luminescence element is a cathode electrode, a voltage of the first power source line is greater than a voltage of the second power source line, and

a current flows from the first power source line to the second power source line.

3. The image display device according to claim 1 , further comprising:

a first scanning line that connects the first switch and the controller for transmitting a signal to the first switch for controlling the first switch;

a second scanning line that connects the second switch and the controller for transmitting a signal to the second switch for controlling the second switch; and

a third scanning line that connects the third switch and the controller for transmitting a signal to the third switch for controlling the third switch.

4. The image display device according to claim 3 , wherein the first scanning line and the second scanning line are a common scanning line.

5. The image display device according to claim 1 , wherein the third power source line and the fourth power source line are a common power source line.

6. The image display device according to claim 1 , wherein the third power source line is separate from the fourth power source line.

7. The image display device according to claim 1 , wherein the luminescence element is an organic electro-luminescence element.

8. An image display device, comprising:

a luminescence element that has a first electrode and a second electrode;

a first capacitor that has a first electrode and a second electrode, and holds a capacitor voltage;

a driver that has a drain electrode, a gate electrode connected to the first electrode of the first capacitor, and a source electrode connected to the first electrode of the luminescence element, and causes the luminescence element to emit light by applying a drain current corresponding to the capacitor voltage held by the first capacitor to the luminescence element;

a second capacitor that has a first electrode connected to the second electrode of the first capacitor and a second electrode;

a first power source line for determining a potential of the drain electrode of the driver;

a second power source line electrically connected to the second electrode of the luminescence element;

a third power source line for supplying a first reference voltage to the second electrode of the first capacitor;

a fourth power source line for supplying a second reference voltage to the second electrode of the second capacitor;

a data line for supplying a signal voltage to the first electrode of the first capacitor;

a first switch between the third power source line and the second electrode of the first capacitor for supplying the first reference voltage to the second electrode of the first capacitor;

a second switch between the data line and the first electrode of the first capacitor for supplying the signal voltage to the first electrode of the first capacitor;

a third switch between the first electrode of the luminescence element and the second electrode of the first capacitor for connecting the first electrode of the luminescence element and the second electrode of the first capacitor; and

a controller for controlling the first switch, the second switch, and the third switch,

wherein the controller:

causes the first capacitor to hold the capacitor voltage corresponding to the signal voltage by switching ON the first switch and the second switch while the third switch is switched OFF; and

switches OFF the first switch and the second switch to switch ON the third switch after the capacitor voltage corresponding to the signal voltage is held by the first capacitor, and

wherein the second capacitor stores a source potential of the driver while the third switch is switched ON.

9. The image display device according to claim 8 ,

wherein the first electrode of the luminescence element is an anode electrode,

the second electrode of the luminescence element is a cathode electrode,

a voltage of the first power source line is greater than a voltage of the second power source line, and

a current flows from the first power source line to the second power source line.

10. The image display device according to claim 8 , comprising:

a first scanning line that connects the first switch and the controller for transmitting a signal to the first switch for controlling the first switch;

a second scanning line that connects the second switch and the controller for transmitting a signal to the second switch for controlling the second switch; and

a third scanning line that connects the third switch and the controller for transmitting a signal to the third switch for controlling the third switch.

11. The image display device according to claim 10 , wherein the first scanning line and the second scanning line are a common scanning line.

12. The image display device according to claim 8 , wherein the third power source line and the fourth power source line are a common power source line.

13. The display device according to claim 8 , wherein the third power source line is separate from the fourth power source line.

14. The image display device according to claim 8 , wherein the luminescence element is an organic electro-luminescence element.

15. An image display device comprising pixel units, the pixel units including a first pixel unit and a second pixel unit that are adjacent to each other, each of the first pixel unit and second pixel unit comprising:

a luminescence element that has a first electrode and a second electrode;

a first capacitor that has a first electrode and a second electrode, and holds a capacitor voltage;

a driver that has a drain electrode, a gate electrode connected to the first electrode of the first capacitor, and a source electrode connected to the first electrode of the luminescence element, and causes the luminescence element to emit light by applying a drain current corresponding to the capacitor voltage held by the first capacitor to the luminescence element;

a first power source line for determining a potential of the drain electrode of the driver;

a second power source line electrically connected to the second electrode of the luminescence element;

a third power source line for supplying a first reference voltage to the first electrode of the first capacitor;

a data line for supplying a signal voltage to the second electrode of the first capacitor;

a first switch between the third power source line and the first electrode of the first capacitor for supplying the first reference voltage to the first electrode of the first capacitor;

a second switch between the data line and the second electrode of the first capacitor for supplying the signal voltage to the second electrode of the first capacitor;

a third switch between the first electrode of the luminescence element and the second electrode of the first capacitor for connecting the first electrode of the luminescence element and the second electrode of the first capacitor;

a first scanning line for transmitting a signal to the first switch for controlling the first switch;

a second scanning line for transmitting a signal to the second switch for controlling the second switch; and

a third scanning line for transmitting a signal to the third switch for controlling the third switch,

wherein the image display device, includes:

a controller that is connected to the first switch through the first scanning line, the second switch through the second scanning line, and the third switch through the third scanning line, the controller controlling the first switch, the second switch, and the third switch, and

wherein the controller:

causes the first capacitor to hold the capacitor voltage corresponding to the signal voltage by switching ON the first switch and the second switch while the third switch is switched OFF; and

switches OFF the first switch and the second switch to switch ON the third switch after the capacitor voltage corresponding to the signal voltage is held by the first capacitor, and

the first scanning line included in the first pixel unit, the second scanning line included in the first pixel unit, and the third scanning line included in the second pixel unit are diverted from a common scanning line from the controller.

16. The image display device according to claim 15 , wherein the luminescence element is an organic electro-luminescence element.

17. The image display device according to claim 15 , further comprising:

a second capacitor that has a first electrode connected to the second electrode of the first capacitor and a second electrode;

a fourth power source line for supplying a second reference voltage to the second electrode of the second capacitor;

wherein the second capacitor stores a source potential of the driver while the third switch is switched ON.