Display device with input function

• US 10,423,260 B2
• Filed: 11/14/2017
• Issued: 09/24/2019
• Est. Priority Date: 11/30/2016
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Naganuma, Tomohiko
• Primary Examiner(s): Castiaux, Brent D
• Application Number:
  US15/811,800
• Publication Number:
  US 20180150164A1
• Time in Patent Office: 679 Days
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04144 using an array of force sensing means position sensing using the local deformation of sensor cells G06F3/0447
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/8052 Cathodes
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/164 using vacuum deposition
• CPC Class Codes: H10K 71/621 Providing a shape to conductive layers, e.g. patterning or selective deposition
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 : Organic PV cells

Abstract

A display device with an input function including a substrate, a plurality of pixels arranged above the substrate, a light emitting element including a first electrode, a second electrode and an organic layer between the first electrode and the second electrode each arranged in the plurality of pixels, and a sensor part including the second electrode, a first inorganic insulating layer arranged above the second electrode, a piezoelectric layer arranged above the first inorganic insulating layer, a second insulating layer arranged above the piezoelectric layer, and a third electrode arranged above the second inorganic insulating layer, wherein the plurality of pixels and the sensor part are arranged overlapping each other, and the second electrode is shared by the plurality of pixels and the sensor part.

Claims

1. A display device with an input function comprising:

a substrate;

a plurality of pixels arranged above the substrate;

a light emitting element including a first electrode, a second electrode and an organic layer between the first electrode and the second electrode each arranged in the plurality of pixels; and

a sensor part including the second electrode, a first inorganic insulating layer arranged above the second electrode, a piezoelectric layer arranged above the first inorganic insulating layer and without being directly connected with any electrodes, a second inorganic insulating layer arranged above the piezoelectric layer, and a third electrode arranged above the second inorganic insulating layer,

wherein

the plurality of pixels and the sensor part are arranged overlapping each other, and the second electrode is shared by the plurality of pixels and the sensor part.

2. The display device with an input function according to claim 1, wherein the substrate has flexibility.

3. The display device with an input function according to claim 1, wherein the second electrode is formed above an upper surface of the organic layer, and the third electrode is divided into a plurality at an upper surface of the second electrode through the piezoelectric layer.

4. The display device with an input function according to claim 1, wherein the second electrode is divided into a plurality at an upper surface of the organic layer, and the third electrode is divided into a plurality at an upper surface of the second electrode through the piezoelectric layer.

5. The display device with an input function according to claim 1, wherein the first electrode is divided into a plurality corresponding to each pixel.

6. The display device with an input function according to claim 4, wherein the third electrode corresponds to each of the second electrodes divided into a plurality.

7. The display device with an input function according to claim 1, wherein the second electrode serves also as an electrode of the light emitting element and an electrode of the sensor part.

8. The display device with an input function according to claim 1, further comprising:

a display region including a plurality of the organic layers, and a non-display region separate from the display region,

wherein

the display region includes the first electrode, the organic layer, the second electrode, the first inorganic insulating layer, the piezoelectric layer, the second inorganic insulating layer and the third electrode; and

the non-display region includes the second electrode, the first inorganic insulating layer, the piezoelectric layer, the second inorganic insulating layer and the third electrode.

9. The display device with an input function according to claim 1, further comprising:

a detection part configured to detect a potential difference between a potential of an upper surface and a potential of a lower surface of the piezoelectric layer; and

a control circuit configured to determine that the piezoelectric layer has been pressed when the potential difference detected by the detection part is a first value or higher, and determine that the piezoelectric layer has not been pressed when the potential difference detected by the detection part is less than the first value.

10. The display device with an input function according to claim 9, wherein the control circuit detects a pressed amount when a potential difference detected by the detection part is the first value or higher.

11. The display device with an input function according to claim 10, further comprising:

a circuit connected to the third electrode and configured to detect a difference in a current value of the third electrode.

12. The display device with an input function according to claim 11, wherein the control circuit determines that the piezoelectric layer has been bent when the potential difference detected by the detection part is a second value larger than the first value or higher, determines that the piezoelectric layer has not been bent when electricity to the first electrode and the second electrode is switched ON to make the organic layer emit light and the potential difference detected by the detection part is the first value of higher and less than the second value, and electricity to the first electrode is switched OFF.

13. The display device with an input function according to claim 12, further comprising:

a detection part configured to detect a potential difference between a potential of an upper surface and a potential of a lower surface of the piezoelectric layer; and

a control circuit recognizes the potential difference of a bent virtual surface is the second value or more when the sensor part is bent and the bent virtual surface is formed, and the control circuit continues turning off electricity to the first electrode included in mutually opposing regions with the bent virtual surface as a boundary and turns on an electricity to the first electrode included in regions other than the opposing regions.

14. The display device with an input function according to claim 1, wherein the second electrode and the third electrode are transparent.

15. The display device with an input function according to claim 1, wherein pairs of end parts of the first inorganic insulating layer and the second inorganic insulating layer are adjacent or linked and enclose the piezoelectric layer in a cross-sectional view.