DISPLAY DEVICE
An nMOS is used for a drive TFT and a display device is provided without being affected by variations in the threshold voltage of the drive TFT. A display device includes: a field-effect transistor that controls a drive current of a light emitting element; a first switch provided between a source of the field-effect transistor and an anode terminal of the light emitting element; a second switch provided between the source of the field-effect transistor and a signal line; a third switch provided between a drain of the field-effect transistor and a power supply line; a fourth switch provided between the drain and a gate of the field-effect transistor; a capacitor provided between the gate of the field-effect transistor and the anode terminal of the light emitting element; and a fifth switch provided between the anode terminal of the light emitting element and a predetermined voltage supply line.
1 . A display device comprising:
a plurality of pixels arranged in a matrix, each of the pixels having a light emitting element;
a signal line that supplies a video signal voltage to each of the pixels according to a gray scale value;
a power supply line that supplies light emission cower to each of the light emitting elements; and
a predetermined voltage supply line that supplies a predetermined voltage to each of the pixels,
wherein each of the pixels includes:
a field-effect transistor that controls a drive current of the light emitting element;
a first switch provided between a source of the field-effect transistor and an anode terminal of the light emitting element;
a second switch provided between the source of the field-effect transistor and the signal line;
a third switch provided between a drain of the field-effect transistor and the power supply line;
a fourth switch provided between the drain and a gate of the field-effect transistor;
a capacitor provided between the gate of the field-effect transistor and the anode terminal of the light emitting element; and
a fifth switch provided between the anode terminal of the light emitting element and the predetermined voltage supply line.
2 . The display device according to claim 1 , wherein the field-effect transistor is an nMOS transistor.
3 . The display device according to claim 1 , wherein the first to fifth switches are nMOS transistors or pMOS transistors.
4 . The display device according to claim 3 , wherein the first to fifth switches are all nMOS transistors.
5 . The display device according to claim 1 , wherein the second switch and the third switch are connected to a common scanning line.
6 . The display device according to claim 1 , wherein the first switch and the fifth switch are connected to a common scanning line.
7 . The display device according to claim 1 , wherein the first switch, the fifth switch, and the fourth switch are connected to a common scanning line.
8 . The display device according to claim 1 , wherein the first switch and a third switch included in the adjacent pixel are connected to a common scanning line.
9 . The display device according to claim 1 , wherein the fifth switch and the forth switch are connected to a common scanning line.
10 . The display device according to claim 1 , wherein the predetermined voltage supply line is a scanning line of the first switch.
11 . The display device according to claim 1 , wherein the light emitting element is an organic light emitting diode.
12 . The display device according to claim 1 , wherein the field-effect transistor is a TFT.
13 . The display device according to claim 12 , wherein the TFT is a polycrystalline Si semiconductor device.
14 . The display device according to claim 12 , wherein the TFT is a microcrystalline Si semiconductor device.
15 . The display device according to claim 12 , wherein the TFT is an amorphous semiconductor device.
16 . The display device according to claim 12 , wherein the TFT is an oxide semiconductor device.