Display device and electronic apparatus
View Patent ↗Disclosed herein is a display device including a pixel array part configured to include scan lines disposed along rows, signal lines disposed along columns, and pixels that are disposed at intersections of the scan lines and the signal lines and arranged in a matrix, each of the pixels having at least a sampling transistor, a drive transistor, a switching transistor, a hold capacitor, and a light-emitting element; and a drive part configured to include a scanner and a driver, the driver supplying a video signal to the signal lines along the columns.
1. A display device comprising:
a pixel array part configured to include scan lines disposed along rows, signal lines disposed along columns, and pixels that are disposed at intersections of the scan lines and the signal lines and arranged in a matrix, each of the pixels having at least a sampling transistor, a drive transistor, a switching transistor, a hold capacitor, and a light-emitting element; and
a drive part configured to include a scanner and a driver, the driver supplying a video signal to the signal lines along the columns, wherein
a control terminal of the sampling transistor is connected to the scan line, and a pair of current terminals of the sampling transistor are connected between the signal line and a control terminal of the drive transistor,
a current terminal of the drive transistor on a drain side is connected to a power supply, and a current terminal of the drive transistor on a source side is connected to the light-emitting element,
the hold capacitor is connected between the control terminal of the drive transistor as a gate of the drive transistor and the current terminal of the drive transistor on the source side,
one of a pair of current terminals of the switching transistor is connected to the current terminal of the drive transistor on the source side and the other of the pair of current terminals of the switching transistor is coupled to a fixed potential, and a control terminal of the switching transistor is connected to the scan line disposed on a row previous to a row of the scan line connected to the control terminal of the sampling transistor,
the scanner drives the sampling transistor and the switching transistor included in the pixel by sequentially supplying a control signal to the scan lines along the rows, to supply a drive current dependent upon a video signal from the drive transistor to the light-emitting element,
wherein the scanner carries out a correction operation of writing a threshold voltage of the drive transistor to the hold capacitor repeatedly in a time-division manner by driving the sampling transistor and the switching transistor,
the driver supplies, to the signal lines, a video signal whose potential is switched among a reference potential, a lower potential lower than the reference potential, and a signal potential higher than the reference potential,
the reference potential is applied to the control terminal of the drive transistor in correction operation,
the lower potential is applied to the control terminal of the drive transistor after immediately preceding correction operation and before start of next correction operation, and
the signal potential is applied to the control terminal of the drive transistor after completion of last correction operation.
2. The display device according to claim 1 , wherein
an anode of the light-emitting element is connected to the current terminal of the drive transistor on the source side, and a cathode of the light-emitting element is coupled to a predetermined cathode potential, and
the fixed potential coupled to the current terminal of the switching transistor is lower than the cathode potential.
3. The display device according to claim 1 , wherein
the switching transistor is turned on at a preparatory stage previous to the correction operation to apply the fixed potential to the current terminal of the drive transistor on the source side.
4. An electronic apparatus comprising:
a display device including
a pixel array part configured to include scan lines disposed along rows, signal lines disposed along columns, and pixels that are disposed at intersections of the scan lines and the signal lines and arranged in a matrix, each of the pixels having at least a sampling transistor, a drive transistor, a switching transistor, a hold capacitor, and a light-emitting element; and
a drive part configured to include a scanner and a driver, the driver supplying a video signal to the signal lines along the columns, wherein
a control terminal of the sampling transistor is connected to the scan line, and a pair of current terminals of the sampling transistor are connected between the signal line and a control terminal of the drive transistor,
a current terminal of the drive transistor on a drain side is connected to a power supply, and a current terminal of the drive transistor on a source side is connected to the light-emitting element,
the hold capacitor is connected between the control terminal of the drive transistor as a gate of the drive transistor and the current terminal of the drive transistor on the source side,
one of a pair of current terminals of the switching transistor is connected to the current terminal of the drive transistor on the source side and the other of the pair of current terminals of the switching transistor is coupled to a fixed potential, and a control terminal of the switching transistor is connected to the scan line disposed on a row previous to a row of the scan line connected to the control terminal of the sampling transistor,
the scanner drives the sampling transistor and the switching transistor included in the pixel by sequentially supplying a control signal to the scan lines along the rows, to supply a drive current dependent upon a video signal from the drive transistor to the light-emitting element, wherein the scanner carries out a correction operation of writing a threshold voltage of the drive transistor to the hold capacitor repeatedly in a time-division manner by driving the sampling transistor and the switching transistor,
the driver supplies, to the signal lines, a video signal whose potential is switched among a reference potential, a lower potential lower than the reference potential, and a signal potential higher than the reference potential,
the reference potential is applied to the control terminal of the drive transistor in correction operation,
the lower potential is applied to the control terminal of the drive transistor after immediately preceding correction operation and before start of next correction operation, and
the signal potential is applied to the control terminal of the drive transistor after completion of last correction operation.
5. A display device comprising:
pixel arraying means for including scan lines disposed along rows, signal lines disposed along columns, and pixels that are disposed at intersections of the scan lines and the signal lines and arranged in a matrix, each of the pixels having at least a sampling transistor, a drive transistor, a switching transistor, a hold capacitor, and a light-emitting element; and
driving means for including a scanner and a driver, the driver supplying a video signal to the signal lines along the columns, wherein
a control terminal of the sampling transistor is connected to the scan line, and a pair of current terminals of the sampling transistor are connected between the signal line and a control terminal of the drive transistor,
a current terminal of the drive transistor on a drain side is connected to a power supply, and a current terminal of the drive transistor on a source side is connected to the light-emitting element,
the hold capacitor is connected between the control terminal of the drive transistor as a gate of the drive transistor and the current terminal of the drive transistor on the source side,
one of a pair of current terminals of the switching transistor is connected to the current terminal of the drive transistor on the source side and the other of the pair of current terminals of the switching transistor is coupled to a fixed potential, and a control terminal of the switching transistor is connected to the scan line disposed on a row previous to a row of the scan line connected to the control terminal of the sampling transistor, and
the scanner drives the sampling transistor and the switching transistor included in the pixel by sequentially supplying a control signal to the scan lines along the rows, to supply a drive current dependent upon a video signal from the drive transistor to the light-emitting element,
wherein the scanner carries out a correction operation of writing a threshold voltage of the drive transistor to the hold capacitor repeatedly in a time-division manner by driving the sampling transistor and the switching transistor,
the driver supplies, to the signal lines, a video signal whose potential is switched among a reference potential, a lower potential lower than the reference potential, and a signal potential higher than the reference potential,
the reference potential is applied to the control terminal of the drive transistor in correction operation,
the lower potential is applied to the control terminal of the drive transistor after immediately preceding correction operation and before start of next correction operation, and
the signal potential is applied to the control terminal of the drive transistor after completion of last correction operation.