DISPLAY DEVICE AND ELECTRONIC DEVICE

• US 20180026218A1
• Filed: 07/17/2017
• Published: 01/25/2018
• Est. Priority Date: 07/22/2016
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KOBAYASHI, Hidetomo, TOYOTAKA, Kouhei
• Granted Patent: US 10,586,495 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/0456 with a reflective area and a transmissive area combined in one pixel, such as in transflectance pixels
• CPC Class Codes: G09G 2300/046 with an emissive area and a light-modulating area combined in one pixel
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs

Abstract

A display device that can be easily and more flexibly designed is provided. The display device includes a pixel circuit and a driver circuit in a display portion. The driver circuit includes a plurality of pulse output circuits. Each of the plurality of pulse output circuits has a function of driving a gate line. The pixel circuit is electrically connected to the gate line. Each of the plurality of pulse output circuits includes a first transistor. The pixel circuit includes a second transistor. A layer including the second transistor is over a layer including the first transistor, and the first transistor and the second transistor overlap with each other.

Claims

1. A display device comprising:

a driver circuit comprising a plurality of pulse output circuits, each of the plurality of pulse output circuits comprising a first transistor; and

a pixel circuit comprising a second transistor,

wherein each of the plurality of pulse output circuits is configured to drive a gate line,

wherein the pixel circuit is electrically connected to the gate line,

wherein a second layer comprising the second transistor is stacked over a first layer comprising the first transistor, and

wherein the first transistor and the second transistor overlap with each other.

2. The display device according to claim 1, wherein the first transistor and the second transistor have the same polarity.

3. The display device according to claim 1, further comprising a display element electrically connected to the pixel circuit,

wherein a third layer comprising the display element is stacked over the second layer.

4. The display device according to claim 1, further comprising a display element electrically connected to the pixel circuit,

wherein a third layer comprising the display element is stacked over the second layer, and

wherein the display element comprises a light-emitting element or a liquid crystal element.

5. The display device according to claim 1,

wherein the pixel circuit further comprises a third transistor, and

wherein the third transistor is provided in the first layer.

6. An electronic device comprising the display device according to claim 1.

7. A display device comprising:

a driver circuit comprising a plurality of pulse output circuits, each of the plurality of pulse output circuits comprising a first transistor; and

a pixel circuit comprising a second transistor,

wherein each of the plurality of pulse output circuits is configured to drive a gate line,

wherein the pixel circuit is electrically connected to the gate line,

wherein a second layer comprising the second transistor is stacked over a first layer comprising the first transistor,

wherein the first transistor and the second transistor overlap with each other, and

wherein a conductive layer serving as the gate line is provided in the first layer.

8. The display device according to claim 7, wherein the first transistor and the second transistor have the same polarity.

9. The display device according to claim 7, further comprising a display element electrically connected to the pixel circuit,

wherein a third layer comprising the display element is stacked over the second layer.

10. The display device according to claim 7, further comprising a display element electrically connected to the pixel circuit,

wherein a third layer comprising the display element is stacked over the second layer, and

wherein the display element comprises a light-emitting element or a liquid crystal element.

11. The display device according to claim 7,

wherein the pixel circuit further comprises a third transistor, and

wherein the third transistor is provided in the first layer.

12. An electronic device comprising the display device according to claim 7.

13. A display device comprising:

a driver circuit comprising a plurality of pulse output circuits, each of the plurality of pulse output circuits comprising a first transistor; and

a pixel circuit comprising a second transistor,

wherein each of the plurality of pulse output circuits is configured to drive a gate line,

wherein the pixel circuit is electrically connected to the gate line,

wherein a second layer comprising the second transistor is stacked over a first layer comprising the first transistor,

wherein the first transistor and the second transistor overlap with each other,

wherein a conductive layer serving as the gate line is provided in the first layer, and

wherein a channel formation region of each of the first transistor and the second transistor comprises a metal oxide.

14. The display device according to claim 13, wherein the first transistor and the second transistor have the same polarity.

15. The display device according to claim 13, further comprising a display element electrically connected to the pixel circuit,

wherein a third layer comprising the display element is stacked over the second layer.

16. The display device according to claim 13, further comprising a display element electrically connected to the pixel circuit,

wherein a third layer comprising the display element is stacked over the second layer, and

wherein the display element comprises a light-emitting element or a liquid crystal element.

17. The display device according to claim 13,

wherein the pixel circuit further comprises a third transistor, and

wherein the third transistor is provided in the first layer.

18. An electronic device comprising the display device according to claim 13.