Semiconductor device, input/output device, and electronic appliance

• US 10,622,426 B2
• Filed: 01/04/2018
• Issued: 04/14/2020
• Est. Priority Date: 05/02/2014
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Eguchi, Shingo, Yamazaki, Shunpei
• Primary Examiner(s): Lamb, Christopher R
• Application Number:
  US15/861,945
• Publication Number:
  US 20180130861A1
• Time in Patent Office: 831 Days
• Field of Search: None
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/1275 Electrical connections of the two substrates
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/871 Self-supporting sealing arrangements

Abstract

A flexible input/output device and an input/output device having high resistance to repeated bending are provided. The input/output device includes a first flexible substrate, a first insulating layer over the first substrate, a first transistor over the first insulating layer, a light-emitting element over and electrically connected to the first transistor and including an EL layer between first and second electrodes, a first bonding layer over the light-emitting element, a sensing element and a second transistor over the first bonding layer and electrically connected to each other, a second insulating layer over the sensing element and the second transistor, and a second flexible substrate over the second insulating layer. In the input/output device, B/A is greater than or equal to 0.7 and less than or equal to 1.7, where A is a thickness between the EL layer and the first insulating layer and B is a thickness between the EL layer and the second insulating layer.

Claims

1. A display device comprising:

a first flexible substrate;

a first bonding layer over the first flexible substrate;

a first insulating layer over the first bonding layer;

a first transistor over the first insulating layer;

a first conductive layer over the first insulating layer;

a light-emitting element electrically connected to the first transistor, the light-emitting element comprising an EL layer between a first electrode and a second electrode;

a second bonding layer over the light-emitting element;

a sensing element and a second transistor that are over the second bonding layer and electrically connected to each other;

a second insulating layer over the sensing element and the second transistor;

a third bonding layer over the second insulating layer;

a second flexible substrate over the third bonding layer;

a first flexible printed circuit over the first flexible substrate; and

a second flexible printed circuit electrically connected to the sensing element,

wherein the first flexible printed circuit is electrically connected to the first conductive layer through an opening in the second insulating layer and the second bonding layer,

wherein the first flexible printed circuit is provided over the second insulating layer, and

wherein at least part of an edge of the first bonding layer is positioned outside an edge of the first flexible substrate.

2. The display device according to claim 1,

wherein at least one of the first transistor and the second transistor comprises an oxide semiconductor in a channel formation region, and

wherein the oxide semiconductor comprises indium and zinc.

3. The display device according to claim 1, wherein a thickness of the first bonding layer is greater than or equal to 50 nm and less than or equal to 3 μ

m.

4. The display device according to claim 1, wherein a thickness of the second bonding layer is greater than or equal to 50 nm and less than or equal to 3 μ

m.

5. The display device according to claim 1, wherein at least part of an edge of the third bonding layer is positioned outside an edge of the second flexible substrate.

6. The display device according to claim 1, further comprising a color filter between the light-emitting element and the sensing element.

7. The display device according to claim 1, further comprising a light-blocking layer,

wherein the light-blocking layer and the second transistor overlap each other.

8. An electronic appliance comprising:

the display device according to claim 1; and

at least one of a battery, an antenna, a speaker, and an operating key.

9. A display device comprising:

a first flexible substrate;

a first bonding layer over the first flexible substrate;

a first insulating layer over the first bonding layer;

a first transistor over the first insulating layer;

a first conductive layer over the first insulating layer;

a light-emitting element electrically connected to the first transistor, the light-emitting element comprising an EL layer between a first electrode and a second electrode;

a second bonding layer over the light-emitting element;

a sensing element and a second transistor that are over the second bonding layer and electrically connected to each other;

a second insulating layer over the sensing element and the second transistor;

a third bonding layer over the second insulating layer;

a second flexible substrate over the third bonding layer;

a first flexible printed circuit over the first flexible substrate; and

a second flexible printed circuit electrically connected to the sensing element through a first opening in the first insulating layer and the second bonding layer,

wherein the first flexible printed circuit is electrically connected to the first conductive layer through a second opening in the second insulating layer and the second bonding layer,

wherein the first flexible printed circuit is provided over the second insulating layer, and

wherein at least part of an edge of the first bonding layer is positioned outside an edge of the first flexible substrate.

10. The display device according to claim 9,

wherein at least one of the first transistor and the second transistor comprises an oxide semiconductor in a channel formation region, and

wherein the oxide semiconductor comprises indium and zinc.

11. The display device according to claim 9, wherein a thickness of the first bonding layer is greater than or equal to 50 nm and less than or equal to 3 μ

m.

12. The display device according to claim 9, wherein a thickness of the second bonding layer is greater than or equal to 50 nm and less than or equal to 3 μ

m.

13. The display device according to claim 9, wherein at least part of an edge of the third bonding layer is positioned outside an edge of the second flexible substrate.

14. The display device according to claim 9, further comprising a color filter between the light-emitting element and the sensing element.

15. The display device according to claim 9, further comprising a light-blocking layer,

wherein the light-blocking layer and the second transistor overlap each other.

16. An electronic appliance comprising:

the display device according to claim 9; and

at least one of a battery, an antenna, a speaker, and an operating key.