Light emitting apparatus, method for driving light emitting apparatus and electronic apparatus
AssigneeSeiko Epson Corporation
InventorsHideto ISHIGURO, Satoshi Yatabe
Life of this patent
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Abstract
A light emitting apparatus includes a pixel circuit, and a drive circuit which drives the pixel circuit. The pixel circuit has a light emitting device, a driving transistor connected in series to the light emitting device, a capacitative element arranged between a gate and a source of the driving transistor, a first switching device arranged between the gate of the driving transistor and a signal line corresponding to the pixel circuit, and a second switching device arranged between the source of the driving transistor and a reset line.
Claims14
A light emitting apparatus comprising:
- a pixel circuit;
- and
- a drive circuit which drives the pixel circuit, wherein:
- the pixel circuit includes:
- a light emitting device;
- a driving transistor connected in series to the light emitting device;
- a capacitative element arranged between a gate and a source of the driving transistor;
- a first switching device arranged between the gate of the driving transistor and a signal line corresponding to the pixel circuit;
- and
- a second switching device arranged between the source of the driving transistor and a reset line, and
- the drive circuit;
- for a first period, sets the first switching device to be turned on and sets a potential to be supplied to the signal line to a data potential corresponding to designated gradation of the pixel circuit to flow a current according to the data potential in the driving transistor and sets a voltage between both ends of the capacitative element to a value in which the data potential and properties of the driving transistor are reflected;
- for a second period after the first period, sets the first switching device to be turned off and sets the second switching device to be turned on to set a source potential of the driving transistor to a reset potential supplied to the reset line;
- and
- for a third period after the second period, sets the second switching device to be turned off to vary the source potential of the driving transistor so that the light emitting device emits light.
A method for driving a light emitting apparatus including a pixel circuit which has a light emitting device, a driving transistor connected in series to the light emitting device, and a capacitative element arranged between a gate and a source of the driving transistor, the method comprising:
- for a first period, setting a voltage between both ends of the capacitative element to a value in which a data potential and properties of the driving transistor are reflected by supplying the data potential corresponding to designated gradation of the pixel circuit to the gate of the driving transistor to flow a current corresponding to the data potential in the driving transistor;
- for a second period after the first period, setting a source potential of the driving transistor to a reset potential;
- and
- for a third period after the second period, varying the source potential of the driving transistor so that the light emitting device emits light.
Dependencies are inferred from the claim text.