Light-emitting device

• US 9,985,052 B2
• Filed: 10/24/2017
• Issued: 05/29/2018
• Est. Priority Date: 12/10/2013
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kaneyasu, Makoto
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Nadkarni, Sarvesh J
• Application Number:
  US15/792,031
• Publication Number:
  US 20180047758A1
• Time in Patent Office: 217 Days
• Field of Search: None
• 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 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 29/7869 having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
• CPC Class Codes: H01L 29/78696 characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel H01L29/78612 takes precedence; transistors having a drain offset region or a lightly doped drain [LDD] H01L29/78621

Abstract

To provide a light-emitting device capable of suppressing the display of an afterimage. A plurality of pixels arranged in n rows and m columns (n and m are each an integer of 2 or more) is supplied with a first signal containing image data and a second signal for initializing the pixels. Each pixel includes a first transistor for controlling the input of the first signal and a second transistor for controlling the input of the second signal. The first transistor in a k-th row (k is an integer of 1 to n) and the second transistor in a k+1-th row are turned on at the same time, so that the pixels are initialized and display images effectively.

Claims

1. A light-emitting device comprising:

a first transistor;

a second transistor;

a third transistor, a gate of the third transistor electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the second transistor;

a fourth transistor;

a fifth transistor;

a sixth transistor, a gate of the sixth transistor electrically connected to one of a source and a drain of the fourth transistor and one of a source and a drain of the fifth transistor;

a first capacitor, a first terminal of the first capacitor electrically connected to the gate of the third transistor and a second terminal of the first capacitor electrically connected to one of a source and a drain of the third transistor;

a second capacitor, a first terminal of the second capacitor electrically connected to the gate of the sixth transistor and a second terminal of the second capacitor electrically connected to one of a source and a drain of the sixth transistor;

a first light-emitting element, a first terminal of the first light-emitting element electrically connected to the one of the source and the drain of the third transistor;

a second light-emitting element, a first terminal of the second light-emitting element electrically connected to the one of the source and the drain of the sixth transistor;

a first wiring electrically connected to a gate of the second transistor;

a second wiring electrically connected to a gate of the first transistor and a gate of the fifth transistor;

a third wiring electrically connected to a gate of the fourth transistor; and

a fourth wiring electrically connected to the other of the source and the drain of the first transistor and the other of the source and the drain of the fourth transistor.

2. The light-emitting device according to claim 1,

wherein the other of the source and the drain of the third transistor is supplied with a first potential,

wherein a second terminal of the first light-emitting element is supplied with a second potential,

wherein the other of the source and the drain of the sixth transistor is supplied with the first potential,

wherein a second terminal of the second light-emitting element is supplied with the second potential, and

wherein the fourth wiring is supplied with a signal containing image data.

3. The light-emitting device according to claim 1,

wherein the gate of the third transistor is directly connected to the one of the source and the drain of the first transistor and the one of the source and the drain of the second transistor,

wherein the first terminal of the first light-emitting element is directly connected to the one of the source and the drain of the third transistor,

wherein the gate of the sixth transistor is directly connected to the one of the source and the drain of the fourth transistor and the one of the source and the drain of the fifth transistor,

wherein the first terminal of the second light-emitting element is directly connected to the one of the source and the drain of the sixth transistor, and

wherein the second wiring is directly connected to the gate of the first transistor and the gate of the fifth transistor.

4. The light-emitting device according to claim 1, wherein each of the first to the sixth transistors contains an oxide semiconductor in a channel formation region.

5. The light-emitting device according to claim 4,

wherein the oxide semiconductor contains indium, zinc, and M, and

wherein M is gallium, tin, hafnium, aluminum, or zirconium.

6. An electronic device comprising the light-emitting device according to claim 1, a microphone, and an operation key.

7. A light-emitting device comprising:

a first transistor;

a second transistor;

a third transistor, a gate of the third transistor electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the second transistor;

a fourth transistor;

a fifth transistor;

a sixth transistor, a gate of the sixth transistor electrically connected to one of a source and a drain of the fourth transistor and one of a source and a drain of the fifth transistor;

a first capacitor, a first terminal of the first capacitor electrically connected to the gate of the third transistor and a second terminal of the first capacitor electrically connected to the other of the source and the drain of the second transistor and one of a source and a drain of the third transistor;

a second capacitor, a first terminal of the second capacitor electrically connected to the gate of the sixth transistor and a second terminal of the second capacitor electrically connected to the other of the source and the drain of the fifth transistor and one of a source and a drain of the sixth transistor;

a first light-emitting element, a first terminal of the first light-emitting element electrically connected to the one of the source and the drain of the third transistor;

a second light-emitting element, a first terminal of the second light-emitting element electrically connected to the one of the source and the drain of the sixth transistor;

a first wiring electrically connected to a gate of the second transistor;

a second wiring electrically connected to a gate of the first transistor and a gate of the fifth transistor;

a third wiring electrically connected to a gate of the fourth transistor; and

a fourth wiring electrically connected to the other of the source and the drain of the first transistor and the other of the source and the drain of the fourth transistor.

8. The light-emitting device according to claim 7,

wherein the other of the source and the drain of the third transistor is supplied with a first potential,

wherein a second terminal of the first light-emitting element is supplied with a second potential,

wherein the other of the source and the drain of the sixth transistor is supplied with the first potential,

wherein a second terminal of the second light-emitting element is supplied with the second potential, and

wherein the fourth wiring is supplied with a signal containing image data.

9. The light-emitting device according to claim 7,

wherein the gate of the third transistor is directly connected to the one of the source and the drain of the first transistor and the one of the source and the drain of the second transistor,

wherein the first terminal of the first light-emitting element is directly connected to the one of the source and the drain of the third transistor,

wherein the gate of the sixth transistor is directly connected to the one of the source and the drain of the fourth transistor and the one of the source and the drain of the fifth transistor,

wherein the first terminal of the second light-emitting element is directly connected to the one of the source and the drain of the sixth transistor, and

wherein the second wiring is directly connected to the gate of the first transistor and the gate of the fifth transistor.

10. The light-emitting device according to claim 7, wherein each of the first to the sixth transistors contains an oxide semiconductor in a channel formation region.

11. The light-emitting device according to claim 10,

wherein the oxide semiconductor contains indium, zinc, and M, and

wherein M is gallium, tin, hafnium, aluminum, or zirconium.

12. An electronic device comprising the light-emitting device according to claim 7, a microphone, and an operation key.