Display device and display device driving method for causing reduction in power consumption

1. A display device, comprising:

a power supplier configured to output at least one of a high-side output potential and a low-side output potential;

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

a plurality of scanning lines connected to a corresponding one of the pixels;

a plurality of data lines connected to a corresponding one of the pixels;

two or more detecting lines each of which has one end connected to a corresponding one of two or more pixels inside the display, and is for transmitting a high-side applied potential or a low-side applied potential that is applied to the corresponding one of the two or more pixels;

a relay connected to the other end of each of the two or more detecting lines and to one end of one or more output lines which are fewer in number than the two or more detecting lines, and configured to output, to the one or more output lines, at least one applied potential out of the two or more high-side applied potentials or at least one applied potential out of the two or more low-side applied potentials, the high-side and low-side applied potentials being transmitted by the two or more detecting lines; and

a regulator connected to the relay via the one or more output lines and configured to regulate at least one of the high-side output potential and the low-side output potential to be outputted by the power supplier, such that any one of the following potential differences reaches a predetermined potential difference: a potential difference between a reference potential and the high-side applied potential outputted by the relay; a potential difference between the reference potential and the low-side applied potential outputted by the relay; and a potential difference between the high-side applied potential and the low-side applied potential, wherein

the display and the relay are provided on the same substrate,

each of the pixels includes a driver, a switching element, and a luminescence element, the driver including a source electrode and a drain electrode, the switching element including a gate electrode, a source electrode, and a drain electrode, the luminescence element including a first electrode and a second electrode,

each of the plurality of scanning lines is connected to the gate electrode of the switching element of the corresponding one of the pixels,

each of the plurality of the data lines is connected to one of the source electrode and the drain electrode of the switching element of the corresponding one of the pixels,

the one end of each of the detecting lines is connected to any one of the source electrode of the driver, the drain electrode of the driver, the first electrode, and the second electrode, and

the predetermined potential difference is determined based on VTFT, VEL, ΔV, and Vdrop, where VTFT is the voltage required by the driver, VEL is the voltage required by the luminescent element, ΔV is the potential difference between the potential outputted by the power supplier and the potential of the luminescent pixel measured by a voltage measurer, and Vdrop is the voltage margin corresponding to ΔV, which is determined by a voltage margin setter accessing a voltage margin conversion table that indicates a particular Vdrop that corresponds to a designated ΔV.

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

a detecting circuit connected to the other end of each of the one or more output lines and to the regulator,

wherein the detecting circuit is configured to detect and select, from among the applied potentials outputted by the relay, at least one of a lowest applied potential out of the high-side applied potentials and a highest applied potential out of the low-side applied potentials, and to output the selected at least one applied potential to the regulator.

3. The display device according to claim 1 ,

wherein the relay includes, internally, a detecting circuit connected to the other end of each of the one or more output lines, and

the detecting circuit is configured to detect and select, from among the applied potentials transmitted by the two or more detecting lines, at least one of a lowest applied potential out of the high-side applied potentials and a highest applied potential out of the low-side applied potentials, and to output the selected at least one applied potential to the one or more output lines.

4. The display device according to claim 1 ,

wherein the relay is configured to time-divide the applied potentials transmitted by the two or more detecting lines, and sequentially output the time-divided applied potentials to the one or more output lines, and

the regulator is configured to regulate at least one of the high-side output potential and the low-side output potential to be outputted by the power supplier, such that at least one of the following potential differences reaches the predetermined potential difference: a potential difference between the reference potential and a lowest applied potential out of the high-side applied potentials; and a potential difference between the reference potential and a highest applied potential out of the low-side applied potentials, the high-side and low-side applied potentials being included in the applied potentials outputted by the relay.

5. The display device according to claim 1 ,

wherein the relay is configured to convert, into digital data, the applied potentials inputted to the relay as analog data, and output the applied potentials as the digital data.

6. The display device according to claim 1 ,

wherein the first electrode is 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.

7. The display device according to claim 6 ,

wherein the second electrode is part of a common electrode provided in common to the pixels,

the common electrode is electrically connected to the power supplier so that a potential is applied to the common electrode from a periphery of the common electrode, and

at least a predetermined one of the two or more pixels is disposed near a center of the display.

8. The display device according to claim 7 ,

wherein the second electrode comprises a transparent conductive material including a metal oxide.

9. The display device according to claim 6 ,

wherein the luminescence element is an organic electroluminescence (EL) element.

10. A method of driving a display device including a power supplier which outputs at least one of a high-side output potential and a low-side output potential, a display device in which a plurality of pixels are arranged and which receives power supply from the power supplier, a plurality of scanning lines connected to a corresponding one of the pixels, a plurality of data lines connected to a corresponding one of the pixels, and two or more detecting lines each of which has one end connected to a corresponding one of two or more pixels inside the display device, and transmits a high-side applied potential or a low-side applied potential applied to the corresponding one of the two or more pixels, the method comprising:

outputting, to one or more output lines, at least one applied potential out of the high-side applied potentials or at least one applied potential out of the low-side applied potentials, the one or more output lines being fewer in number than the two or more detecting lines, and the high-side and low-side applied potentials being transmitted by the two or more detecting lines; and

regulating at least one of the high-side output potential and the low-side output potential such that any one of the following potential differences reaches a predetermined potential difference: a potential difference between a reference potential and the high-side applied potential outputted in the outputting; a potential difference between the reference potential and the low-side applied potential outputted in the outputting; and a potential difference between the high-side applied potential and the low-side applied potential,

wherein each of the pixels includes a driver, a switching element, and a luminescence element, the driver including a source electrode and a drain electrode, the switching element including a gate electrode, a source electrode, and a drain electrode, the luminescence element including a first electrode and a second electrode,

each of the plurality of scanning lines is connected to the gate electrode of the switching element of the corresponding one of the pixels,

each of the plurality of data lines is connected to one of the source electrode and the drain electrode of the switching element of the corresponding one of the pixels, and

the predetermined potential difference is determined based on VTFT, VEL, ΔV, and Vdrop, where VTFT is the voltage required by the driver, VEL is the voltage required by the luminescent element, ΔV is the potential difference between the potential outputted by the power supplier and the potential of the luminescent pixel measured by a voltage measurer, and Vdrop is the voltage margin corresponding to ΔV, which is determined by a voltage margin setter accessing a voltage margin conversion table that indicates a particular Vdrop that corresponds to a designated ΔV, and

connecting one end of each of the detecting lines to any one of the source electrode of the driver, the drain electrode of the driver, the first electrode, and the second electrode.

11. A display device, comprising:

a power supplier configured to output at least one of a high-side output potential and a low-side output potential;

a display in which a plurality of pixels are arranged and which receives power supply from the power supplier, a plurality of scanning lines are connected to each of the plurality of pixels, and a plurality of data lines are connected to each of the plurality of pixels;

two or more detecting lines each of which has one end connected to a corresponding one of two or more pixels inside the display, and is for transmitting a high-side applied potential or a low-side applied potential that is applied to the corresponding one of the two or more pixels;

a relay connected to the other end of each of the two or more detecting lines and to one end of one or more output lines which are fewer in number than the two or more detecting lines, and configured to output, to the one or more output lines, at least one applied potential out of the two or more high-side applied potentials or at least one applied potential out of the two or more low-side applied potentials, the high-side and low-side applied potentials being transmitted by the two or more detecting lines, wherein utilizing a multi-bit select signal, the relay uses time-division multiplexing to transmit signals transmitted by a subset of the two or more detecting lines using a single output line; and

a regulator connected to the relay via the one or more output lines and configured to regulate at least one of the high-side output potential and the low-side output potential to be outputted by the power supplier, such that any one of the following potential differences reaches a predetermined potential difference: a potential difference between a reference potential and the high-side applied potential outputted by the relay; a potential difference between the reference potential and the low-side applied potential outputted by the relay; and a potential difference between the high-side applied potential and the low-side applied potential,

wherein the display and the relay are provided on the same substrate, and

the predetermined potential difference is determined based on VTFT, VEL, ΔV, and Vdrop, where VTFT is the voltage required by the driver, VEL is the voltage required by the luminescent element, ΔV is the potential difference between the potential outputted by the power supplier and the potential of the luminescent pixel measured by a voltage measurer, and Vdrop is the voltage margin corresponding to ΔV, which is determined by a voltage margin setter accessing a voltage margin conversion table that indicates a particular Vdrop that corresponds to a designated ΔV.

12. The display device according to claim 11 ,

wherein each of the pixels includes a driver, a switching element, and a luminescence element, the driver including a source electrode and a drain electrode, the switching element including a gate electrode, a source electrode, and a drain electrode, the luminescence element including a first electrode and a second electrode,

each of the plurality scanning lies in connected to the gate electrode of the switching element of the corresponding one of the pixels,

each of the plurality of the data lines is connected to one of the source electrode and the drain electrode of the switching element of the corresponding one of the pixels, and

the one end of each of the detecting lines is connected to any one of the source electrode of the driver, the drain electrode of the driver, the first electrode, and the second electrode.

13. A display device, comprising:

a power supplier configured to output at least one of a high-side output potential and a low-side output potential;

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

two or more detecting lines each of which has one end connected to a corresponding one of two or more pixels inside the display, and is for transmitting a high-side applied potential or a low-side applied potential that is applied to the corresponding one of the two or more pixels;

a relay connected to the other end of each of the two or more detecting lines and to one end of one or more output lines which are fewer in number than the two or more detecting lines, and configured to output, to the one or more output lines, at least one applied potential out of the two or more high-side applied potentials or at least one applied potential out of the two or more low-side applied potentials, the high-side and low-side applied potentials being transmitted by the two or more detecting lines; and

a regulator connected to the relay via the one or more output lines and configured to regulate at least one of the high-side output potential and the low-side output potential to be outputted by the power supplier, such that any one of the following potential differences reaches a predetermined potential difference: a potential difference between a reference potential and the high-side applied potential outputted by the relay; a potential difference between the reference potential and the low-side applied potential outputted by the relay; and a potential difference between the high-side applied potential and the low-side applied potential,

wherein the display and the relay are provided on the same substrate,

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

the predetermined potential difference is determined based on VTFT, VEL, ΔV, and Vdrop, where VTFT is the voltage required by the driver, VEL is the voltage required by the luminescent element, ΔV is the potential difference between the potential outputted by the power supplier and the potential of the luminescent pixel measured by a voltage measurer, and Vdrop is the voltage margin corresponding to ΔV, which is determined by a voltage margin setter accessing a voltage margin conversion table that indicates a particular Vdrop that corresponds to a designated ΔV.

14. The display device according to claim 1 ,

wherein the voltage margin setter determines an output voltage Vout to be output in each frame period.

15. The method according to claim 10 ,

wherein the voltage margin setter determines an output voltage Vout to be output in each frame period.

16. The display device according to claim 11 ,

wherein the voltage margin setter determines an output voltage Vout to be output in each frame period.

17. The display device according to claim 13 ,

wherein the voltage margin setter determines an output voltage Vout to be output in each frame period.