Display unit, drive unit, driving method, and electronic apparatus
View Patent ↗A display unit includes: a unit pixel; a switch configured to perform ON-OFF control between a second terminal and a third terminal, based on a pulse signal applied to a first terminal, the second terminal being supplied with a DC signal, and the third terminal being connected to the unit pixel; and a non-linear element interposed between the first terminal and the third terminal.
1. A display comprising:
a unit pixel;
a switch configured to perform ON-OFF control between a second terminal and a third terminal, based on a pulse signal applied to a first terminal, the second terminal being supplied with a DC signal, and the third terminal being connected to the unit pixel; and
a non-linear element interposed between the first terminal and the third terminal, wherein
the pulse signal transits between a first voltage and a second voltage, the first voltage turning on the switch and turning off the non-linear element, and the second voltage turning off the switch,
the unit pixel includes a display element and a drive transistor supplying a drive current to the display element, and the switch supplies the drive current to the drive transistor,
the unit pixel further includes a first capacitor and a write transistor,
the drive transistor includes a gate, a source connected to the display element, and a drain connected to the third terminal,
the first capacitor is interposed between the gate and the source of the drive transistor, and
the write transistor is turned on to apply a reset voltage to the gate of the drive transistor during a writing preparation period and to apply a pixel voltage to the gate of the drive transistor during a writing period.
2. The display according to claim 1 , wherein
the writing preparation period includes a first sub-period and a second sub-period that is disposed after the first sub-period, and
the pulse signal is at the second voltage during the first sub-period and is at the first voltage during the second sub-period and the writing period.
3. The display according to claim 2 , wherein
the non-linear element applies a third voltage corresponding to the second voltage, to the unit pixel during the first sub-period, and
the switch applies a fourth voltage indicated by the DC signal, to the unit pixel during the second sub-period and the writing period.
4. The display according to claim 3 , wherein
the non-linear element sets a source voltage of the drive transistor to the third voltage through the drive transistor during the first sub-period, and
the switch allows a current to flow through the drive transistor to vary the source voltage of the drive transistor during the second sub-period.
5. The display according to claim 2 , wherein
the writing preparation period includes a third sub-period disposed before the first sub-period,
the pulse signal is at the first voltage during the third sub-period, and
the switch applies a fourth voltage indicated by the DC signal, to the unit pixel during the third sub-period.
6. The display according to claim 5 , wherein the drive transistor decreases an amount of the drive current to be supplied to the display element during the third sub-period.
7. The display according to claim 1 , wherein
the unit pixel further includes a second capacitor connected to the source of the drive transistor.
8. The display according to claim 1 , wherein
the non-linear element is a first transistor including a drain, a gate, and a source, the drain and the gate being connected to the third terminal, and the source being connected to the first terminal, and
the switch is a second transistor having a channel width larger than a channel width of the first transistor.
9. The display according to claim 8 , wherein a conductivity type of the first transistor is same as a conductivity type of the second transistor.
10. The display according to claim 1 , wherein the non-linear element is a diode that has an anode connected to the third terminal and a cathode connected to the first terminal.
11. The display according to claim 1 , further comprising:
a first wiring connected to the first terminal, and configured to transmit the pulse signal; and
a second wiring connected to the second terminal and intersecting with the first wiring, and configured to transmit the DC signal.
12. The display according to claim 11 , wherein the second wiring has sheet resistance lower than sheet resistance of the first wiring at an intersection of the first wiring and the second wiring.
13. A display comprising:
a unit pixel;
a switch configured to perform ON-OFF control between a second terminal and a third terminal, based on a pulse signal applied to a first terminal, the second terminal being supplied with a DC signal, and the third terminal being connected to the unit pixel; and
a non-linear element interposed between the first terminal and the third terminal, wherein
the pulse signal transits between a first voltage and a second voltage, the first voltage turning on the switch and turning off the non-linear element, and the second voltage turning off the switch,
the unit pixel includes a display element and a drive transistor supplying a drive current to the display element, and the switch supplies the drive current and the drive transistor,
the unit pixel further includes a first capacitor and a control transistor,
the drive transistor includes a gate, a source connected to the display element, and a drain connected to the third terminal,
the first capacitor is interposed between the gate and the source of the drive transistor, and
the control transistor is turned on to apply a reset voltage to the gate of the drive transistor during one or more of a plurality of sub-periods that are included in a writing preparation period disposed before a writing period.
14. The display according to claim 13 , wherein
the writing preparation period includes a first sub-period and a second sub-period that is disposed after the first sub-period, and
the pulse signal is at the second voltage during the first sub-period and is at the first voltage during the second sub-period and the writing period.
15. The display according to claim 14 , wherein
the non-linear element applies a third voltage corresponding to the second voltage, to the unit pixel during the first sub-period, and
the switch applies a fourth voltage indicated by the DC signal, to the unit pixel during the second sub-period and the writing period.
16. The display according to claim 15 , wherein
the non-linear element sets a source voltage of the drive transistor to the third voltage through the drive transistor during the first sub-period, and
the switch allows a current to flow through the drive transistor to vary the source voltage of the drive transistor during the second sub-period.
17. The display according to claim 14 , wherein
the writing preparation period includes a third sub-period disposed before the first sub-period,
the pulse signal is at the first voltage during the third sub-period, and
the switch applies a fourth voltage indicated by the DC signal, to the unit pixel during the third sub-period.
18. The display according to claim 13 , wherein
the unit pixel further includes a second capacitor connected to the source of the drive transistor.
19. An electronic apparatus provided with a display and a control section configured to perform operation control on the display, the display comprising:
a unit pixel;
a switch configured to perform ON-OFF control between a second terminal and a third terminal, based on a pulse signal applied to a first terminal, the second terminal being supplied with a DC signal, and the third terminal being connected to a unit pixel; and
a non-linear element interposed between the first terminal and the third terminal, wherein
the pulse signal transits between a first voltage and a second voltage, the first voltage turning on the switch and turning off the non-linear element, and the second voltage turning off the switch,
the unit pixel includes a display element and a drive transistor supplying a drive current to the display element, and the switch supplies the drive current to the drive transistor,
the unit pixel further includes a first capacitor and a write transistor,
the drive transistor includes a gate, a source connected to the display element, and a drain connected to the third terminal,
the first capacitor is interposed between the gate and the source of the drive transistor, and
the write transistor is turned on to apply a reset voltage to the gate of the drive transistor during a writing preparation period and to apply a pixel voltage to the gate of the drive transistor during a writing period.