Display device and electronic apparatus
First Claim
Patent Images
1. A display device comprising:
- a pixel array part configured to includescan lines disposed along rows,signal lines disposed along columns, andpixels that are disposed at intersections of the scan lines and the signal lines and are arranged in a matrix; and
a drive part configured to drive the pixel array part and includea control scanner anda signal selector,the control scanner sequentially applying a control pulse to the scan lines with a predetermined horizontal cycle to thereby line-sequentially scan the pixels on a row-by-row basis, the signal selector supplying a video signal to the signal lines disposed along the columns in matching with the line-sequential scanning, whereinthe pixel includesa sampling transistor having a gate connected to the scan line and a source and a drain one of which is connected to the signal line,a drive transistor having a gate connected to the other of the source and the drain of the sampling transistor and a source and a drain one of which is connected to a power supply,a light-emitting element connected to the other of the source and the drain of the drive transistor, anda hold capacitor connected between the source and the gate of the drive transistor,the sampling transistor is kept at an on-state during a period from rising of a control pulse supplied from the control scanner to falling of the control pulse with a time width shorter than one horizontal cycle, and samples a video signal from the signal line to write the video signal to the hold capacitor,the sampling transistor has a double gate structure in which a pair of transistor elements are connected in series between the signal line and the gate of the drive transistor and gates of the pair of transistor elements are connected in common, andthe drive transistor causes a drive current dependent on a video signal written to the hold capacitor to flow to the light-emitting element for light emission.
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Abstract
A sampling transistor in embodiments of the present invention is kept at the on-state with a time width shorter than one horizontal cycle, during the period from the rising of a control pulse supplied from a scanner to the falling of the control pulse, and samples a video signal Vsig from a signal line SL to write the video signal Vsig to a hold capacitor. A sampling transistor T1 has a double gate structure in which a pair of transistor elements are connected in common. This suppresses change in the threshold voltage of the sampling transistor.
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Citations
11 Claims
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1. A display device comprising:
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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 are arranged in a matrix; and a drive part configured to drive the pixel array part and include a control scanner and a signal selector, the control scanner sequentially applying a control pulse to the scan lines with a predetermined horizontal cycle to thereby line-sequentially scan the pixels on a row-by-row basis, the signal selector supplying a video signal to the signal lines disposed along the columns in matching with the line-sequential scanning, wherein the pixel includes a sampling transistor having a gate connected to the scan line and a source and a drain one of which is connected to the signal line, a drive transistor having a gate connected to the other of the source and the drain of the sampling transistor and a source and a drain one of which is connected to a power supply, a light-emitting element connected to the other of the source and the drain of the drive transistor, and a hold capacitor connected between the source and the gate of the drive transistor, the sampling transistor is kept at an on-state during a period from rising of a control pulse supplied from the control scanner to falling of the control pulse with a time width shorter than one horizontal cycle, and samples a video signal from the signal line to write the video signal to the hold capacitor, the sampling transistor has a double gate structure in which a pair of transistor elements are connected in series between the signal line and the gate of the drive transistor and gates of the pair of transistor elements are connected in common, and the drive transistor causes a drive current dependent on a video signal written to the hold capacitor to flow to the light-emitting element for light emission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic apparatus including
a main body part and a display part that displays information output from the main body part, the display part 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 are arranged in a matrix; and a drive part configured to drive the pixel array part and include a control scanner and a signal selector, the control scanner sequentially applying a control pulse to the scan lines with a predetermined horizontal cycle to thereby line-sequentially scan the pixels on a row-by-row basis, the signal selector supplying a video signal to the signal lines disposed along the columns in matching with the line-sequential scanning, wherein the pixel includes a sampling transistor having a gate connected to the scan line and a source and a drain one of which is connected to the signal line, a drive transistor having a gate connected to the other of the source and the drain of the sampling transistor and a source and a drain one of which is connected to a power supply, a light-emitting element connected to the other of the source and the drain of the drive transistor, and a hold capacitor connected between the source and the gate of the drive transistor, the sampling transistor is kept at an on-state during a period from rising of a control pulse supplied from the control scanner to falling of the control pulse with a time width shorter than one horizontal cycle, and samples a video signal from the signal line to write the video signal to the hold capacitor, the sampling transistor has a double gate structure in which a pair of transistor elements are connected in series between the signal line and the gate of the drive transistor and gates of the pair of transistor elements are connected in common, and the drive transistor causes a drive current dependent on a video signal written to the hold capacitor to flow to the light-emitting element for light emission.
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10. A display device comprising:
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pixel array 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 are arranged in a matrix; and drive means for driving the pixel array means and including a control scanner and a signal selector, the control scanner sequentially applying a control pulse to the scan lines with a predetermined horizontal cycle to thereby line-sequentially scan the pixels on a row-by-row basis, the signal selector supplying a video signal to the signal lines disposed along the columns in matching with the line-sequential scanning, wherein the pixel includes a sampling transistor having a gate connected to the scan line and a source and a drain one of which is connected to the signal line, a drive transistor having a gate connected to the other of the source and the drain of the sampling transistor and a source and a drain one of which is connected to a power supply, a light-emitting element connected to the other of the source and the drain of the drive transistor, and a hold capacitor connected between the source and the gate of the drive transistor, the sampling transistor is kept at an on-state during a period from rising of a control pulse supplied from the control scanner to falling of the control pulse with a time width shorter than one horizontal cycle, and samples a video signal from the signal line to write the video signal to the hold capacitor, the sampling transistor has a double gate structure in which a pair of transistor elements are connected in series between the signal line and the gate of the drive transistor and gates of the pair of transistor elements are connected in common, and the drive transistor causes a drive current dependent on a video signal written to the hold capacitor to flow to the light-emitting element for light emission.
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11. An electronic apparatus including
a main body part and a display part that displays information output from the main body part, the display part comprising: -
pixel array 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 are arranged in a matrix; and drive means for driving the pixel array means and including a control scanner and a signal selector, the control scanner sequentially applying a control pulse to the scan lines with a predetermined horizontal cycle to thereby line-sequentially scan the pixels on a row-by-row basis, the signal selector supplying a video signal to the signal lines disposed along the columns in matching with the line-sequential scanning, wherein the pixel includes a sampling transistor having a gate connected to the scan line and a source and a drain one of which is connected to the signal line, a drive transistor having a gate connected to the other of the source and the drain of the sampling transistor and a source and a drain one of which is connected to a power supply, a light-emitting element connected to the other of the source and the drain of the drive transistor, and a hold capacitor connected between the source and the gate of the drive transistor, the sampling transistor is kept at an on-state during a period from rising of a control pulse supplied from the control scanner to falling of the control pulse with a time width shorter than one horizontal cycle, and samples a video signal from the signal line to write the video signal to the hold capacitor, the sampling transistor has a double gate structure in which a pair of transistor elements are connected in series between the signal line and the gate of the drive transistor and gates of the pair of transistor elements are connected in common, and the drive transistor causes a drive current dependent on a video signal written to the hold capacitor to flow to the light-emitting element for light emission.
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Specification