Display device

1. A display device, comprising:

a power supplying unit configured to output a high-side output potential and a low-side output potential;

a display unit in which a plurality of pixels are arranged and which receives power supply from the power supplying unit;

a voltage detecting unit configured to detect a high-side applied potential applied to a first pixel in the display unit and a low-side applied potential applied to a second pixel in the display unit, the second pixel being different from the first pixel; and

a voltage regulating unit configured to regulate at least one of the high-side output potential and the low-side output potential outputted from the power supplying unit such that a potential difference between the high-side applied potential and the low-side applied potential reaches a predetermined potential difference, wherein

each of the pixels includes a driver and a luminescent element,

the predetermined potential difference is a potential difference expressed as VTFT+VEL−ΔV+Vdrop, where VTFT is a voltage required by the driver, VEL is a voltage required by the luminescent element, ΔV is a potential difference between a potential output by the power supply and a potential of a pixel detected by the voltage detecting unit, and Vdrop is a voltage margin corresponding to ΔV.

2. The display device according to claim 1 ,

wherein at least one of (i) the number of pixels for which the voltage detecting unit detects the high-side applied potential and (ii) the number of pixels for which the voltage detecting unit detects the low-side applied potential is plural.

3. The display device according to claim 2 ,

wherein the voltage regulating unit is configured to:

select at least one applied potential from among:

a lowest applied potential among high-side applied potentials detected by the voltage detecting unit; and

a highest applied potential among low-side applied potentials detected by the voltage detecting unit; and

regulate the power supplying unit based on the selected at least one applied potential.

4. The display device according to claim 1 ,

wherein the voltage detecting unit is further configured to detect at least one of the high-side output potential and the low-side output potential which are outputted by the power supplying unit, and

the voltage regulating unit is configured to receive inputs of a power source potential difference which is a potential difference between the high-side output potential and the low-side output potential and a pixel potential difference which is a potential difference between the high-side applied potential and the low-side applied potential, and regulate at least one of the high-side output potential and the low-side output potential in accordance with a potential difference between the power source potential difference and the pixel potential difference, the high-side output potential and the low-side output potential being outputted by the power supplying unit, the high-side applied potential being applied to the first pixel, and the low-side applied potential being applied to the second pixel.

5. The display device according to claim 4 , wherein the voltage regulating unit is configured to regulate the power supplying unit so that (i) the potential difference between the power source potential difference and the pixel potential difference and (ii) the power source potential difference are in an increasing function relationship.

6. The display device according to claim 1 ,

wherein the voltage detecting unit is further configured to detect at least one of (i) a potential in a high-side potential current path connecting the power supplying unit and a high potential side of the pixels and (ii) a potential in a low-side potential current path connecting the power supplying unit and the low potential side of the pixels; and

the voltage regulating unit is configured to regulate at least one of the high-side output potential and the low-side output potential that are outputted from the power supplying unit, in accordance with a first potential difference which is at least one of (i) a potential difference between the potential in the high-side potential current path and the high-side applied potential applied to the first pixel and (ii) a potential difference between the potential in the low-side potential current path and the low-side applied potential applied to the second pixel.

7. The display device according to claim 6 , wherein the voltage regulating unit is configured to regulate the power supplying unit so that the power source potential difference and the first potential difference are in an increasing function relationship.

8. The display device according to claim 1 ,

wherein the driver having a source electrode and a drain electrode; and

the luminescence element having a first electrode and a second electrode, the first electrode being connected to one of the source electrode and the drain electrode of the driver,

the high-side applied potential is applied to one of the second electrode and the other of the source electrode and the drain electrode, and

the low-side applied potential is applied to the other of the second electrode and the other of the source electrode and the drain electrode.

9. The display device according to claim 8 ,

wherein the pixels are arranged in rows and columns;

the display device further includes a first power source line and a second power source line, the first power source line connecting the others of the source electrode and the drain electrode of the respective drivers of adjacent pixels in at least one of the row direction and the column direction, and the second power source line connecting the second electrodes of the respective luminescence elements of adjacent pixels in the row direction and the column direction; and

the pixels receive the power supply from the power supplying unit via the first power source line and the second power source line.

10. The display device according to claim 9 , wherein the second electrode and the second power source line are part of a common electrode that is common to the pixels, and are electrically connected to the power supplying unit so that a potential is applied to the common electrode from a periphery of the common electrode.

11. The display device according to claim 10 , wherein the second electrode comprises a transparent conductive material including a metal oxide.

12. The display device according to claim 8 , wherein the luminescence element is an organic electroluminescence (EL) element.

13. The display device according to claim 1 further comprising at least one of:

a high-side potential detecting line having one end connected to the first pixel and the other end connected to the voltage detecting unit, for transmitting the high-side applied potential to the voltage detecting unit; and

a low-side potential detecting line having one end connected to the second pixel and the other end connected to the voltage detecting unit, for transmitting the low-side applied potential to the voltage detecting unit.