Display device having driving transistor to drive electro-optical element
A display device includes a current-driven electro-optical element, a first supply, a second supply, a driving transistor, a correction transistor, an anode switching transistor, an initialization transistor, and a capacitive element. A current is supplied from the first supply. The second supply is lower in potential than the first supply. The driving transistor is configured to drive the electro-optical element in accordance with a written image signal. The correction transistor is coupled between a gate of the driving transistor and a second terminal of the driving transistor. The anode switching transistor is coupled between the second terminal of the driving transistor and an anode of the electro-optical element. The initialization transistor is coupled between the anode of the electro-optical element and the second supply. The capacitive element is coupled to the gate of the driving transistor. The correction, anode switching, and initialization transistors are n-channel transistors.
1 . A display device comprising a pixel circuit, the pixel circuit comprising:
a current-driven electro-optical element;
a first power supply from which a current is supplied to the electro-optical element;
a second power supply which is lower in potential than the first power supply;
a signal line via which an image signal is supplied to the electro-optical element;
a writing transistor whose first terminal is coupled to the signal line;
a driving transistor whose first terminal is coupled to a second terminal of the writing transistor, the driving transistor being configured to drive the electro-optical element in accordance with an image signal written by the writing transistor;
a correction transistor coupled between a gate of the driving transistor and a second terminal of the driving transistor;
a second switching transistor coupled between the second terminal of the driving transistor and an anode of the electro-optical element;
an initialization transistor coupled between the anode of the electro-optical element and the second power supply; and
a capacitive element coupled between the gate of the driving transistor and the first power supply, wherein
the correction transistor, the second switching transistor, and the initialization transistor are n-channel transistors, and
a current driving power of the second switching transistor is greater than a current driving power of the correction transistor.
2 . The display device according to claim 1 , wherein
the correction transistor, the second switching transistor, and the initialization transistor each include an oxide semiconductor in at least a part of an active region.
3 . The display device according to claim 1 , wherein
the writing transistor is a p-channel transistor, and
a gate of the writing transistor and a gate of the second switching transistor are connected to a same control line.
4 . The display device according to claim 1 , wherein
a gate of the initialization transistor and a gate of the correction transistor are connected to a same control line.
5 . The display device according to claim 1 , the pixel circuit further comprising:
a first switching transistor coupled between the first terminal of the driving transistor and the first power supply, wherein
the first switching transistor is a p-channel transistor, and
a gate of the first switching transistor and a gate of the initialization transistor are connected to a same control line.
6 . The display device according to claim 1 , the pixel circuit further comprising:
a fourth power supply which is lower in potential than the first power supply; and
a gate initialization transistor which provides a coupling between the capacitive element and the fourth power supply.
7 . The display device according to claim 6 , wherein
the gate initialization transistor includes an oxide semiconductor in at least a part of an active region.
8 . The display device according to claim 1 , wherein
the electro-optical element is an organic electroluminescence element.
9 . An imaging apparatus, comprising:
optical hardware including a plurality of lenses;
an image pickup element configured to receive light passing through the optical hardware; and
display hardware configured to display an image picked up by the image pickup element, wherein
the display hardware includes the display device according to claim 1 .
10 . An electronic device, comprising:
a display unit according to claim 1 ;
a housing in which the display is provided; and
a communication interface configured to perform external communication.