Display device
A display device includes a plurality of sub pixels; a plurality of first electrodes, the sub pixel including the first electrode; a plurality of second electrodes, the second electrode being provided commonly for at least one row pixel group, the row pixel group including sub pixels arrayed in a line in a first direction, the plurality of second electrodes being arrayed in a second direction; a light emitting layer between the first electrode and the second electrode, the sub pixel including the light emitting layer; an output transistor connected with the first electrode, the output transistor capable of blocking supply of an electric current to the first electrode, the light emitting layer, and the second electrode; and a plurality of third electrodes facing the second electrodes, the third electrode and the second electrode forming capacitance, the third electrode being connected with a plurality of output terminals respectively.
1. A display device, comprising:
a plurality of sub pixels;
a plurality of first electrodes, a sub pixel including a first electrode;
a plurality of second electrodes, a second electrode being provided commonly for at least one row pixel group, the row pixel group including sub pixels arrayed in a line in a first direction, the plurality of second electrodes being arrayed in a second direction crossing the first direction, the second electrode facing to the first electrode vertically;
a light emitting layer provided between the first electrode and the second electrode in a cross-sectional view, the sub pixel including the light emitting layer;
an output transistor connected with the first electrode, the output transistor capable of blocking supply of an electric current to the first electrode, the light emitting layer, and the second electrode; and
a plurality of third electrodes facing the second electrodes, a third electrode and the second electrode forming capacitance, the third electrode being connected with a plurality of output terminals respectively;
wherein:
the output transistor is connected between the first electrode and a first power supply supplying a first potential to the first electrode and is located for the sub pixel;
in a state where the output transistor is in an on state, a second potential is supplied to the second electrodes, and a potential difference between the first potential and the second potential determines a light emission intensity of the light emitting layer; and
in a state where the output transistor is in an off state, a touch sensor driving signal for a touch sensor is supplied to at least one of the second electrodes.
2. The display device according to claim 1 , wherein:
the second electrode is facing the plurality of row pixel groups adjacent to each other in the second direction; and
the plurality of second electrodes adjacent to each other have a slit therebetween.
3. The display device according to claim 2 , further comprising:
a second power supply supplying the second potential different from the first potential and the touch sensor driving signal to the plurality of second electrodes at a different timing.
4. The display device according to claim 3 , further comprising:
a gate line provided in the first direction; and
a source line provided in the second direction;
wherein:
the sub pixel includes a driving transistor, a pixel selection transistor, and a capacitance element;
one of a drain electrode and a source electrode of the driving transistor is connected with the first electrode, and the other of the drain electrode and the source electrode of the driving transistor is connected with the first power supply;
one of a drain electrode and a source electrode of the pixel selection transistor is connected with a gate electrode of the driving transistor, the other of the drain electrode and the source electrode of the pixel selection transistor is connected with the source line, and a gate electrode of the pixel selection transistor is connected with the gate line;
one of two electrodes of the capacitance element is connected with the gate electrode of the driving transistor; and
the output transistor is located between the driving transistor and the first power supply.
5. The display device according to claim 4 , further comprising a controller controlling a signal to be supplied to the first electrode and a signal to be supplied to the second electrode;
wherein the controller puts the output transistor located for the row pixel group into an off state and puts the row pixel group corresponding to the second electrode into a black display period of supplying the touch sensor driving signal.
6. The display device according to claim 5 , wherein the controller controls such that, in one frame, at least one pixel group being driven in a first half of the one frame and at least one row pixel group being driven in a second half of the one frame are put into the black display period.
7. The display device according to claim 6 , further comprising a barrier layer between the second electrodes and the third electrodes, the barrier layer covering the second electrodes and having a barrier property against oxygen and moisture.
8. The display device according to claim 5 , wherein the controller:
controls such that the row pixel groups are sequentially and repeatedly put into:
an initialization period in which a potential of at least one of the source electrode, the drain electrode and the gate electrode of the driving transistor is initialized;
a writing period in which a charge in accordance with a video signal supplied to the gate electrode of the driving transistor via the source line is stored on the capacitance element; and
a light emission period in which the light emitting layer emits light at a light emission intensity in accordance with the video signal;
controls such that the initialization period, the writing period and the light emission period provided for the row pixel group of a first row are subsequently provided for the row pixel group of a second row adjacent to the first row; and
controls such that the row pixel groups are put into the black display period between two light emission periods.
9. The display device according to claim 8 , further comprising a barrier layer between the second electrodes and the third electrodes, the barrier layer covering the second electrodes and having a barrier property against oxygen and moisture.
10. The display device according to claim 9 , further comprising:
a first substrate carrying the plurality of sub pixels thereon;
a second substrate facing the first substrate; and
a filling member between the barrier layer and the second substrate;
wherein the third electrodes are located between the second substrate and the filling member.
11. The display device according to claim 10 , further comprising a color filter between the second substrate and the filling member;
wherein the third electrodes are located between the second substrate and the color filter.
12. The display device according to claim 8 , further comprising:
a first substrate carrying the plurality of sub pixels thereon;
a second substrate facing the first substrate; and
a filling member between the barrier layer and the second substrate;
wherein the third electrodes are located opposite to the first substrate with the second substrate being located between the third electrodes and the first substrate.
13. The display device according to claim 5 , further comprising a barrier layer between the second electrodes and the third electrodes, the barrier layer covering the second electrodes and having a barrier property against oxygen and moisture.
14. The display device according to claim 4 , further comprising a barrier layer between the second electrodes and the third electrodes, the barrier layer covering the second electrodes and having a barrier property against oxygen and moisture.
15. The display device according to claim 3 , further comprising a barrier layer between the second electrodes and the third electrodes, the barrier layer covering the second electrodes and having a barrier property against oxygen and moisture.
16. The display device according to claim 2 , further comprising a barrier layer between the second electrodes and the third electrodes, the barrier layer covering the second electrodes and having a barrier property against oxygen and moisture.
17. The display device according to claim 1 , further comprising a barrier layer between the second electrodes and the third electrodes, the barrier layer covering the second electrodes and having a barrier property against oxygen and moisture.
18. The display device according to claim 17 , further comprising:
a first substrate carrying the plurality of sub pixels thereon;
a second substrate facing the first substrate; and
a filling member between the barrier layer and the second substrate;
wherein the third electrodes are located between the second substrate and the filling member.
19. The display device according to claim 18 , further comprising a color filter between the second substrate and the filling member;
wherein the third electrodes are located between the second substrate and the color filter.
20. The display device according to claim 1 , further comprising:
a first substrate carrying the plurality of sub pixels thereon;
a second substrate facing the first substrate; and
a filling member between the barrier layer and the second substrate;
wherein the third electrodes are located opposite to the first substrate with the second substrate being located between the third electrodes and the first substrate.