Display device with power source supply scan circuits and driving method thereof
View Patent ↗A display device includes a pixel array unit having pixels disposed in a matrix shape, each pixel including an electro-optical element, a write transistor for sampling and writing an input signal voltage, a holding capacitor for holding a signal voltage written by the write transistor, and a driver transistor for driving the electro-optical element in response to the signal voltage held in the holding capacitor. The display device further includes a scan circuit for selectively scanning each pixel in the pixel array unit at a row unit basis and a plurality of power source supply scan circuits for selectively supplying a first potential and a second potential lower than the first potential to a power supply line wired per each pixel row of the pixel array unit to supply current to the driver transistors, synchronously with scanning by the scan circuit.
1. A display device comprising:
a pixel array unit having pixels disposed in a matrix shape, each pixel including an electro-optical element, a write transistor for sampling and writing an input signal voltage provided from a signal line placed at a signal voltage or a reference potential, a holding capacitor for holding the signal voltage written by the write transistor, and a driver transistor for driving the electro-optical element in response to the signal voltage held in the holding capacitor;
a scan circuit for selectively scanning each pixel in the pixel array unit at a row unit basis; and
a plurality of power source supply scan circuits for selectively supplying a first potential and a second potential lower than the first potential to a power supply line to supply current to the driver transistors, synchronously with line sequential scanning by the scan circuit,
wherein, at a beginning of line sequential scanning, the second potential is lower than the reference potential at the signal line; and
wherein the plurality of power source supply scan circuits are disposed on both sides of the pixel array unit by sandwiching the pixel array unit, and one of the plurality of power source supply scan circuits is disposed between the pixel array unit and the scan circuit.
2. The display device according to claim 1 , wherein the driver transistor is initialized for a threshold voltage correction operation by setting a gate of the driver transistor as the reference potential and setting a source of the driver transistor as the second potential.
3. A driving method for use in a display device comprising a scan circuit, a plurality of power source supply scan circuits, and a pixel array unit having pixels disposed in a matrix shape, a write transistor for sampling and writing an input signal voltage provided from a signal line placed at a signal voltage or a reference potential, a holding capacitor for holding the signal voltage written by the write transistor, and a driver transistor for driving the electro-optical element in response to the signal voltage held in the holding capacitor, the method comprising:
selectively scanning each pixel in the pixel array unit on a row unit basis; and
selectively supplying a first potential and a second potential lower than the first potential as power source potential to a power supply line to supply current to the driver transistors, synchronously with line sequential scanning by the scan circuit
wherein, at a beginning of line sequential scanning, the second potential is lower than the reference potential at the signal line; and
wherein the plurality of power source supply scan circuits are disposed on both sides of the pixel array unit by sandwiching the pixel array unit, and one of the plurality of power source supply scan circuits is disposed between the pixel array unit and the scan circuit.
4. The driving method according to claim 3 , wherein the driver transistor is initialized for a threshold voltage correction operation by setting a gate of the driver transistor as the reference potential and setting a source of the driver transistor as the second potential.
5. An electronic apparatus having a display device
the display device comprising:
a pixel array unit having pixels disposed in a matrix shape, each pixel including an electro-optical element, a write transistor for sampling and writing an input signal voltage provided from a signal line placed at a signal voltage or a reference potential, a holding capacitor for holding the signal voltage written by the write transistor, and a driver transistor for driving the electro-optical element in response to the signal voltage held in the holding capacitor;
a scan circuit for selectively scanning each pixel of the pixel array unit on a row unit basis; and
a plurality of power source supply scan circuits for selectively supplying a first potential and a second potential lower than the first potential to a power supply line to supply current to the driver transistors, synchronously with line sequential scanning by the scan circuit
wherein, at a beginning of line sequential scanning, the second potential is lower than the reference potential at the signal line; and
wherein the plurality of power source supply scan circuits are disposed on both sides of the pixel array unit by sandwiching the pixel array unit, and one of the plurality of power source supply scan circuits is disposed between the pixel array unit and the scan circuit.
6. The electronic apparatus according to claim 5 , wherein the driver transistor is initialized for a threshold voltage correction operation by setting a gate of the driver transistor as the reference potential and setting a source of the driver transistor as the second potential.