Display Device And Driving Method Thereof

• US 20120044447A1
• Filed: 11/01/2011
• Published: 02/23/2012
• Est. Priority Date: 11/29/2007
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yoshida, Yasunori
• Granted Patent: US 8,363,176 B2
• Time in Patent Office: Days
• US Class Current: 349/139
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 3/207 by domain size control G09G3/3637 takes precedence
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

With a display device using a pixel which includes a sub-pixel, the display device with improved viewing angle and quality of moving image display is provided without increase in power consumption by driving of the sub-pixel. A circuit which can change conducting states by a plurality of switches is provided, and charge in a plurality of sub-pixels and a capacitor element is transported mutually, so that desired voltage is applied to the plurality of sub-pixels without applying voltage in plural times from external. Moreover, a period in which each sub-pixel displays black is provided in accordance with transfer of charge.

Claims

1. A display device comprising a pixel, the pixel comprising:

a first transistor;

a second transistor;

a first pixel electrode;

a second pixel electrode; and

a first wiring,

wherein at least one of the first transistor and the second transistor comprises an oxide semiconductor,

wherein a first terminal of the first transistor is electrically connected to the first wiring,

wherein a second terminal of the first transistor is electrically connected to the first pixel electrode,

wherein a first terminal of the second transistor is electrically connected to the first wiring, and

wherein a second terminal of the second transistor is electrically connected to the second pixel electrode.

2. The display device according to claim 1, further comprising a second wiring and a third wiring,

wherein a gate of the first transistor is electrically connected to the second wiring, and

wherein a gate of the second transistor is electrically connected to the third wiring.

3. The display device according to claim 1, further comprising a first capacitor, a second capacitor, and a second wiring,

wherein a first terminal of the first capacitor is electrically connected to the first pixel electrode,

wherein a second terminal of the first capacitor is electrically connected to the second wiring,

wherein a first terminal of the second capacitor is electrically connected to the second pixel electrode, and

wherein a second terminal of the second capacitor is electrically connected to the second wiring.

4. The display device according to claim 3, further comprising a third transistor,

wherein a first terminal of the third transistor is electrically connected to the first wiring, and

wherein a second terminal of the third transistor is electrically connected to the first terminal of the first transistor.

5. The display device according to claim 3, further comprising a third capacitor and a third wiring,

wherein a first terminal of the third capacitor is electrically connected to the second pixel electrode through the second transistor, and

wherein a second terminal of the third capacitor is electrically connected to the third wiring.

6. The display device according to claim 3, further comprising a third capacitor and a third wiring,

wherein a first terminal of the third capacitor is electrically connected to the second pixel electrode, and

wherein a second terminal of the third capacitor is electrically connected to the third wiring.

7. The display device according to claim 6, wherein the oxide semiconductor is at least one of ZnO, a-InGaZnO, SiGe, GaAs, IZO, ITO, and SnO.

8. An electronic device comprising a display device according to claim 6.

9. A display device comprising a pixel, the pixel comprising:

a first transistor;

a second transistor;

a first capacitor;

a second capacitor;

a first pixel electrode;

a second pixel electrode;

a first wiring;

a second wiring; and

a third wiring,

wherein at least one of the first transistor and the second transistor comprises an oxide semiconductor,

wherein a first terminal of the first transistor is electrically connected to the first wiring,

wherein a second terminal of the first transistor is electrically connected to the first pixel electrode,

wherein a first terminal of the second transistor is electrically connected to the first wiring, and

wherein a second terminal of the second transistor is electrically connected to the second pixel electrode,

wherein a first terminal of the first capacitor is electrically connected to the first pixel electrode,

wherein a second terminal of the first capacitor is electrically connected to the second wiring,

wherein a first terminal of the second capacitor is electrically connected to the second pixel electrode, and

wherein a second terminal of the second capacitor is electrically connected to the third wiring.

10. The display device according to claim 9, further comprising a third transistor,

wherein a first terminal of the third transistor is electrically connected to the first wiring, and

wherein a second terminal of the third transistor is electrically connected to the first terminal of the first transistor.

11. The display device according to claim 9, further comprising a third capacitor and a fourth wiring,

wherein a first terminal of the third capacitor is electrically connected to the second pixel electrode through the second transistor, and

wherein a second terminal of the third capacitor is electrically connected to the fourth wiring.

12. The display device according to claim 9, further comprising a third capacitor and a fourth wiring,

wherein a first terminal of the third capacitor is electrically connected to the second pixel electrode, and

wherein a second terminal of the third capacitor is electrically connected to the fourth wiring.

13. The display device according to claim 9, further comprising a third transistor and a fourth wiring,

wherein a first terminal of the third transistor is electrically connected to the second pixel electrode through the second transistor, and

wherein a second terminal of the third transistor is electrically connected to the fourth wiring.

14. The display device according to claim 9, further comprising a third transistor and a fourth wiring,

wherein a first terminal of the third transistor is electrically connected to the second pixel electrode, and

wherein a second terminal of the third transistor is electrically connected to the fourth wiring.

15. The display device according to claim 9, further comprising a third transistor, a third capacitor, a fourth wiring, and a fifth wiring,

wherein a first terminal of the third transistor is electrically connected to the second pixel electrode through the second transistor,

wherein a second terminal of the third transistor is electrically connected to the fourth wiring,

wherein a first terminal of the third capacitor is electrically connected to the second pixel electrode through the second transistor, and

wherein a second terminal of the third capacitor is electrically connected to the fifth wiring.

16. The display device according to claim 9, further comprising a third transistor, a third capacitor, a fourth wiring, and a fifth wiring,

wherein a first terminal of the third transistor is electrically connected to the second pixel electrode,

wherein a second terminal of the third transistor is electrically connected to the fourth wiring,

wherein a first terminal of the third capacitor is electrically connected to the second pixel electrode, and

wherein a second terminal of the third capacitor is electrically connected to the fifth wiring.

17. The display device according to claim 16, wherein the oxide semiconductor is at least one of ZnO, a-InGaZnO, SiGe, GaAs, IZO, ITO, and SnO.

18. An electronic device comprising a display device according to claim 16.