DISPLAY DEVICE INCLUDING LIGHT EMITTING ELEMENT

• US 20110175862A1
• Filed: 01/14/2011
• Published: 07/21/2011
• Est. Priority Date: 01/20/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Umezaki, Atsushi, Arasawa, Ryo
• Granted Patent: US 9,984,617 B2
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element

Abstract

Each of a plurality of pixels includes a transistor, a capacitor, and a display element. One terminal of the capacitor is electrically connected to a first line. The other terminal of the capacitor is electrically connected to a gate of the transistor. In a first period, a first terminal of the transistor is electrically connected to the gate of the transistor and the gate of the transistor is electrically connected to a second line. In a second period, the first terminal of the transistor is electrically connected to the gate of the transistor and a second terminal of the transistor is electrically connected to a third line. In a third period, the first terminal of the transistor is electrically connected to the first line and the second terminal of the transistor is electrically connected to the display element.

Claims

1. A display device comprising:

a pixel comprising;

a transistor,

a capacitor having one terminal electrically connected to a first line, and the other terminal electrically connected to a gate of the transistor, and

a display element,

wherein in a first period, a first terminal of the transistor is electrically connected to the gate of the transistor and the gate of the transistor is electrically connected to a second line,

wherein in a second period, the first terminal of the transistor is electrically connected to the gate of the transistor and a second terminal of the transistor is electrically connected to a third line,

wherein in a third period, the first terminal of the transistor is electrically connected to the first line and the second terminal of the transistor is electrically connected to the display element, and

wherein in the first to third periods, a fixed potential is applied to the first line.

4. The display device according claim 1, wherein a video signal is input to the third line.

7. The display device according to claim 1, wherein a fixed potential is applied to the second line.

2. A display device comprising:

a pixel comprising;

a transistor,

a capacitor having one terminal electrically connected to a first line, and the other terminal electrically connected to a gate of the transistor, and

a display element,

wherein in a first period, a first terminal of the transistor is electrically connected to the gate of the transistor, the first terminal of the transistor is electrically disconnected from the first line, the gate of the transistor is electrically connected to a second line, a second terminal of the transistor is electrically disconnected from a third line, and the second terminal of the transistor is electrically disconnected from the display element,

wherein in a second period, the first terminal of the transistor is electrically connected to the gate of the transistor, the first terminal of the transistor is electrically disconnected from the first line, the gate of the transistor is electrically disconnected from the second line, the second terminal of the transistor is electrically connected to the third line, and the second terminal of the transistor is electrically disconnected from the display element,

wherein in a third period, the first terminal of the transistor is electrically disconnected from the gate of the transistor, the first terminal of the transistor is electrically connected to the first line, the gate of the transistor is electrically disconnected from the second line, the second terminal of the transistor is electrically disconnected from the third line, and the second terminal of the transistor is electrically connected to the display element, and

wherein in the first to third periods, a fixed potential is applied to the first line.

5. The display device according claim 2, wherein a video signal is input to the third line.

8. The display device according to claim 2, wherein a fixed potential is applied to the second line.

3. A display device comprising:

a pixel comprising;

a transistor,

a capacitor having one terminal electrically connected to a first line, and the other terminal electrically connected to a gate of the transistor;

a display element; and

first to fifth switches,

wherein a first terminal of the transistor is electrically connected to the gate of the transistor through the first switch,

wherein the first terminal of the transistor is electrically connected to the first line through the second switch,

wherein the gate of the transistor is electrically connected to a second line through the third switch,

wherein a second terminal of the transistor is electrically connected to a third line through the fourth switch, and

wherein the second terminal of the transistor is electrically connected to the display element through the fifth switch.

6. The display device according claim 3, wherein a video signal is input to the third line.

9. The display device according to claim 3, wherein a fixed potential is applied to the second line.