Electro-optical device and driving device thereof
First Claim
1. An electro-optical device, comprising:
- a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels arranged correspondingly to intersections of the plurality of scanning lines and the plurality of data lines; and
a plurality of first power wiring lines, each of the plurality of pixels further comprising;
a first switching transistor an electrical conduction of which is controlled based on a scan signal supplied through a corresponding scanning line of the plurality of scanning lines;
an electro-optical element having a pixel electrode, a common electrode, and an electro-optical material therebetween;
a driving transistor coupled to the electro-optical element; and
a capacitor which has a first electrode and a second electrode forming a capacitance and which is coupled to a gate of the driving transistor through the first electrode, the capacitor holding, as electric charge, a data signal supplied through the first switching transistor and a corresponding data line of the plurality of data lines, an electrical conduction state of the driving transistor being set in accordance with a quantity of electric charge held in the capacitor, and the electro-optical element and the corresponding first power wiring line of the plurality of first power wiring lines being electrically coupled to each other through the driving transistor in accordance with an electrical conduction state thereof, and the second electrode being coupled between the driving transistor and the pixel electrode.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention provides an electro-optical device having circuits for driving electro-optical elements, such as organic EL elements, and a driving device, which can employ driving elements having low driving ability, such as α-TFTs. By providing a charge storage capacitor between the source electrode and the gate electrode of a driving transistor which is between power sources, the electro-optical device can allow the driving transistor to control a driving current, even when an electro-optical element is connected to the source side of the driving transistor. In addition, driving data can be stored in the charge storage capacitor by applying a predetermined voltage to the source electrode of the driving transistor.
-
Citations
24 Claims
-
1. An electro-optical device, comprising:
-
a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels arranged correspondingly to intersections of the plurality of scanning lines and the plurality of data lines; and
a plurality of first power wiring lines, each of the plurality of pixels further comprising;
a first switching transistor an electrical conduction of which is controlled based on a scan signal supplied through a corresponding scanning line of the plurality of scanning lines;
an electro-optical element having a pixel electrode, a common electrode, and an electro-optical material therebetween;
a driving transistor coupled to the electro-optical element; and
a capacitor which has a first electrode and a second electrode forming a capacitance and which is coupled to a gate of the driving transistor through the first electrode, the capacitor holding, as electric charge, a data signal supplied through the first switching transistor and a corresponding data line of the plurality of data lines, an electrical conduction state of the driving transistor being set in accordance with a quantity of electric charge held in the capacitor, and the electro-optical element and the corresponding first power wiring line of the plurality of first power wiring lines being electrically coupled to each other through the driving transistor in accordance with an electrical conduction state thereof, and the second electrode being coupled between the driving transistor and the pixel electrode. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
-
-
2. An electro-optical device, comprising:
-
a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels arranged correspondingly to intersections of the plurality of scanning lines and the plurality of data lines; and
a plurality of first power wiring lines, each of the plurality of pixels further comprising;
a first switching transistor an electrical conduction of which is controlled based on a scan signal supplied through a corresponding scanning line of the plurality of scanning lines;
an electro-optical element having a pixel electrode, a common electrode, and an electro-optical material therebetween;
a driving transistor coupled to the electro-optical element; and
a capacitor which has a first electrode and a second electrode forming a capacitance and which is coupled to a gate of the driving transistor through the first electrode, the capacitor holding, as electric charge, a data signal supplied through the first switching transistor and the corresponding data line of the plurality of data lines, an electrical conduction state of the driving transistor being set in accordance with a quantity of electric charge held in the capacitor, and the electro-optical element and the corresponding first power wiring line of the plurality of first power wiring lines being electrically coupled to each other through the driving transistor in accordance with the electrical conduction state thereof, and the second electrode being coupled between the driving transistor and the pixel electrode, and the second electrode being set to a first predetermined potential by an electrically conducting switching device that controls an electrical connection between the second electrode and the first predetermined potential.
-
-
12. An electro-optical device, comprising:
-
a plurality of scanning lines;
a plurality of data lines;
a plurality of pixels arranged correspondingly to intersections of the plurality of scanning lines and the plurality of data lines; and
a plurality of first power wiring lines, each of the plurality of pixels further comprising;
a first switching transistor an electrical conduction of which is controlled based on a scan signal supplied through the corresponding scanning line of the plurality of scanning lines;
an electro-optical element having a pixel electrode, a common electrode, and an electro-optical material therebetween;
a driving transistor coupled to the electro-optical element; and
a capacitor which has a first electrode and a second electrode forming a capacitance and which is coupled to a gate of the driving transistor through a first electrode, the capacitor holding, as electric charge, a data signal supplied through the first switching transistor and the corresponding data line of the plurality of data lines, an electrical conduction state of the driving transistor being set in accordance with a quantity of electric charge held in the capacitor, and the electro-optical element and the corresponding first power wiring line of the plurality of first power wiring lines being electrically coupled to each other through the driving transistor in accordance with an electrical conduction state thereof, and the electro-optical element being set to a non-activated state based on a scan signal supplied through one of the plurality of scanning lines, before the scan signal that controls an electrical conduction state of the first switching transistor is supplied.
-
-
14. A driving device for driving a plurality of electro-optical elements arranged in a matrix, the driving device comprising:
-
a plurality of scanning lines;
a plurality of data lines;
a plurality of first power wiring lines; and
a plurality of pixel circuits arranged correspondingly to intersections of the plurality of scanning lines and the plurality of data lines, each of the plurality of pixel circuits further comprising;
a first switching transistor the electrical conduction of which is controlled based on a scan signal supplied through a corresponding scanning line of the plurality of scanning lines;
a driving transistor that controls current to be supplied to the electro-optical element in accordance with an electrical conduction state thereof; and
a capacitor which has a first electrode and a second electrode forming a capacitance and which is coupled to a gate of the driving transistor through a first electrode, the capacitor holding, as electric charge, a data signal supplied through the first switching transistor and the corresponding data line of the plurality of data lines, the electrical conduction state of the driving transistor being set in accordance with the quantity of electric charge held in the capacitor, and current having a current level corresponding to an electrical conduction state that is supplied to the corresponding electro-optical element of the plurality of electro-optical elements through the driving transistor from the corresponding first power wiring line of the plurality of first power wiring lines, and the second electrode being coupled to a source of the driving transistor, and for at least a period before the data signal is supplied to the capacitor, the source of the driving transistor being electrically coupled to a first predetermined potential through a switching device. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A driving device for driving a plurality of electro-optical elements arranged in a matrix, the driving device comprising:
-
a plurality of scanning lines;
a plurality of data lines;
a plurality of first power wiring lines; and
a plurality of pixel circuits arranged correspondingly to intersections of the plurality of scanning lines and the plurality of data lines, each of the plurality of pixel circuits including;
a first switching transistor an electrical conduction of which is controlled based on a scan signal supplied through the corresponding scanning line of the plurality of scanning lines;
a driving transistor that controls current to be supplied to the electro-optical element in accordance with an electrical conduction state thereof; and
a capacitor which has a first electrode and a second electrode forming a capacitance and which is coupled to a gate of the driving transistor through a first electrode, the capacitor holding, as electric charge, a data signal supplied through the first switching transistor and the corresponding data line of the plurality of data lines, the electrical conduction state of the driving transistor being set in accordance with a quantity of electric charge held in the capacitor, and current having a current level corresponding to an electrical conduction state being supplied to the corresponding electro-optical element of the plurality of electro-optical elements through the driving transistor from the corresponding first power wiring line of the plurality of first power wiring lines, the second electrode being connected to a source of the driving transistor, and for at least a period when the capacitor holds the quantity of electric charge corresponding to the data signal, a device that keeps constant a potential difference between a source and a gate of the driving transistor being further provided.
-
Specification