Display device and electronic device

• US 10,586,495 B2
• Filed: 07/17/2017
• Issued: 03/10/2020
• Est. Priority Date: 07/22/2016
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kobayashi, Hidetomo, Toyotaka, Kouhei
• Primary Examiner(s): Marinelli, Patrick F
• Application Number:
  US15/651,192
• Publication Number:
  US 20180026218A1
• Time in Patent Office: 967 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 and a third 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 the third transistor,

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

wherein the second transistor is electrically connected to the first transistor through a conductive layer provided in an opening of an insulating layer,

wherein the insulating layer is sandwiched between the first transistor and the second transistor,

wherein a gate electrode of the second transistor and a gate electrode of the third transistor are directly connected to the gate line, and

wherein one of a source and a drain of the third transistor in the first layer is electrically connected to the second transistor in the second layer.

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

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

4. The display device according to claim 1,

wherein the first transistor comprises a semiconductor layer, and

wherein a top surface of the semiconductor layer is in contact with the insulating layer.

5. 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;

a pixel circuit comprising a second transistor and a third transistor; and

a display element electrically connected to the pixel circuit,

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 the third transistor,

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

wherein the second transistor is electrically connected to the first transistor through a conductive layer provided in an opening of an insulating layer,

wherein the insulating layer is sandwiched between the first transistor and the second transistor,

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

wherein one of a source and a drain of the third transistor in the first layer is electrically connected to the second transistor in the second layer and the display element in the third layer,

wherein a gate electrode of the second transistor and a gate electrode of the third transistor are directly connected to the gate line, and

wherein the other of the source and the drain of the third transistor in the first layer is electrically connected to a monitor line in the first layer.

6. The display device according to claim 5, wherein the first transistor and the second transistor have the same polarity.

7. The display device according to claim 5, wherein the display element comprises a light-emitting element.

8. An electronic device comprising the display device according to claim 5.

9. The display device according to claim 5,

wherein the first transistor comprises a semiconductor layer, and

wherein a top surface of the semiconductor layer is in contact with the insulating layer.

10. 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;

a pixel circuit comprising a second transistor and a third transistor; and

a display element electrically connected to the pixel circuit,

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 the third transistor,

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

wherein the second transistor is electrically connected to the first transistor through a conductive layer provided in an opening of an insulating layer,

wherein the insulating layer is sandwiched between the first transistor and the second transistor,

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

wherein one of a source and a drain of the third transistor in the first layer is electrically connected to the second transistor in the second layer and the display element in the third layer,

wherein the other of the source and the drain of the third transistor in the first layer is electrically connected to a monitor line in the first layer,

wherein a gate electrode of the second transistor and a gate electrode of the third transistor are directly connected to the gate line, and

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

11. The display device according to claim 10, wherein the first transistor and the second transistor have the same polarity.

12. An electronic device comprising the display device according to claim 10.

13. The display device according to claim 10,

wherein the first transistor comprises a semiconductor layer, and

wherein a top surface of the semiconductor layer is in contact with the insulating layer.

14. The display device according to claim 10, wherein the metal oxide comprises indium and zinc.

15. The display device according to claim 10, wherein the display element comprises a light-emitting element.