Pixel circuit, method of driving the same, electro-optical device, and electronic apparatus
View Patent ↗A method of driving a pixel circuit, which has a driving transistor for making a current according to a gate voltage flow into a driven element, a resistive element electrically connected in series to the driven element, and a switching transistor provided between the gate of the driving transistor and a data line to be turned on/off, includes first turning on the switching transistor and applying a voltage according to a target current flowing into the driven element to the data line, second turning off the switching transistor, third turning on the switching transistor and applying an added voltage obtained by adding a voltage across the resistive element to the voltage according to the target current to the data line, and fourth turning off the switching transistor and reducing the gate voltage of the driving transistor by the voltage across the resistive element in the third turning on.
1. A pixel circuit comprising:
a driving transistor for making a current according to a gate voltage to flow into a driven element;
a resistive element electrically connected in series to the driven element;
a capacitive element whose one end is connected to a gate of the driving transistor;
a switching transistor provided between the gate of the driving transistor and a data line to be turned on/off; and
a single pole double throw switch whose common port is connected to the other end of the capacitive element, one port is connected to a potential line held with a predetermined potential, and the other port is connected to one end of the resistive element,
a selection period and a non-selection period of a first frame and a selection period and a non-selection period of a second frame being continuous,
during the selection period of the first frame, the switching transistor being turned on and a voltage according to a target current flowing in the driven element being applied to the data line,
during the non-selection period of the first frame, the switching transistor being turned off,
during the selection period of the second frame, the switching transistor being turned on, and
during the non-selection period of the second frame, the switching transistor being turned off,
the signal pole double throw switch closing the common port and the one port thereof during the selection period and the non-selection period of the first frame and the non-selection period of the second frame, and closing the common port and the other port during the selection period of the second frame.
2. The pixel circuit according to claim 1 ,
the driven element being an electro-optical element which emits the light with the luminance according to the flowing current.
3. An electro-optical device comprising:
a plurality of pixel circuits provided to correspond to intersections of scanning lines and data lines;
a scanning line driving circuit for driving the scanning lines; and
a data line driving circuit for driving the data lines,
each pixel circuit having a driving transistor which makes a current according to a gate voltage flow into an electro-optical element for emitting the light with the luminance according to the flowing current;
a resistive element electrically connected in series to the driven element;
a capacitive element whose one end is connected to a gate of the driving transistor;
a switching transistor provided between the gate of the driving transistor and the data line to be turned on/off; and
a single pole double throw switch whose common port is connected to the other end of the capacitive element, one port is connected to a potential line held with a predetermined potential, and the other port is connected to one end of the resistive element,
a selection period and a non-selection period of a first frame and a selection period and a non-selection period of a second frame being continuous,
during the selection period of the first frame, the single pole double throw switch closing the common port and the one port thereof, the scanning line driving circuit turning on the switching transistor, the data line driving circuit applies a voltage according to a target current flowing into the driven element to the data line,
during the non-selection period of the first frame, the scanning line driving circuit turning off the switching transistor,
during the selection period of the second frame, the single pole double throw switch closing the common port and the other port thereof, and the scanning line driving circuit turning on the switching transistor, and
during the non-selection period of the second frame, the single pole double throw switch closing the common port and the one port thereof, and the scanning line driving circuit turning off the switching transistor.
4. An electronic apparatus having the electro-optical device according to claim 3 .
5. The pixel circuit according to claim 1 ,
the target current being the current flowing into a display element according to predetermined gray scale data during the selection period of the first frame.
6. The electro-optical device according to claim 3 ,
the target current being the current flowing into a display element according to predetermined gray scale data during the selection period of the first frame.