# US 10,768,735 B2 · Organic light emitting diode touch panel and method of forming the same

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- Number: US 10,768,735 B2
- Document ID: US10768735B2
- Status: Granted
- Kind: B2
- Application number: 16/308,653
- Filed: 2018-11-16
- Published: 2020-03-12
- Granted: 2020-09-08
- Earliest claimed: 2018-09-12
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Hongyu Zhou
- Web page: https://patentgrep.com/patent/US10768735B2

## CPC

- G06F 3/0443: {using a single layer of sensing electrodes}
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G06F 3/0448: {Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality}
- H10K 59/40: OLEDs integrated with touch screens
- H10K 59/873: {Encapsulations}
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- G06F 2203/04111: Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
- G06F 2203/04112: Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
- H10K 59/12: Active-matrix OLED [AMOLED] displays
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

An OLED touch panel includes an OLED structure, a first conductive layer, a second conductive layer comprising first sensing electrodes, a sensing conductive layer, a third conductive layer comprising second driving electrodes and second sensing electrodes. The first driving electrodes are electrically connected to the plurality of second driving electrodes. The second sensing electrodes overlap the plurality of first sensing electrodes one-on-one.

## Claims

### Claim 1

An organic light-emitting diode (OLED) touch panel, comprising:
a substrate;
an OLED structure, arranged on the substrate;
an encapsulating layer, arranged on the OLED structure;
wherein the OLED touch panel further comprises:
a first conductive layer, arranged on the encapsulating layer, and comprising a plurality of first driving electrodes;
a second conductive layer, arranged on the encapsulating layer, and comprising a plurality of first sensing electrodes;
an insulating layer, covering the first conductive layer and configured to separate the first conductive layer from the second conductive layer;
a sensing conductive layer, arranged on the insulating layer and contacting the plurality of first sensing electrodes;
a third conductive layer, comprising a plurality of second driving electrodes; and
a plurality of second sensing electrodes, arranged on the sensing conductive layer; the plurality of second sensing electrodes overlapping the plurality of first sensing electrodes one-on-one.

### Claim 2 (depends on 1)

The OLED touch panel of claim 1, wherein the first conductive layer is indium tin oxide or indium zinc oxide or silver nanowires (AgNW).

### Claim 3 (depends on 1)

The OLED touch panel of claim 1, wherein the plurality of second sensing electrodes and the third conductive layer are simultaneously formed by a second conductive material.

### Claim 4 (depends on 3)

The OLED touch panel of claim 3, wherein the second conductive material is a metal mesh.

### Claim 5 (depends on 1)

The OLED touch panel of claim 1, wherein the OLED touch panel further comprises an isolating layer; the isolating layer is arranged on the sensing conductive layer and covers the first conductive layer; the isolating layer overlaps the insulating layer.

### Claim 6 (depends on 5)

The OLED touch panel of claim 5, wherein the third conductive layer further comprises a second driving line adjacent to the second driving electrodes.

### Claim 7

A method of forming an organic light-emitting diode (OLED) touch panel, comprising:
forming an OLED structure on a substrate, the OLED structure comprising an anode, a cathode, and an OLED layer; arranging the OLED layer between the anode and the cathode;
forming an encapsulating layer on the OLED structure;
forming a first conductive layer and a second conductive layer on the encapsulating layer; the first conductive layer comprising a plurality of first driving electrodes; the second conductive layer comprising a plurality of first sensing electrodes;
forming an insulating layer to cover the first conductive layer; the insulating layer configured to separate the first conductive layer from the second conductive layer;
forming a sensing conductive layer on the insulating layer; the sensing conductive layer contacting the plurality of first sensing electrodes;
forming a third conductive layer and a plurality of second sensing electrodes on the sensing conductive layer, wherein the third conductive layer comprises a plurality of second driving electrodes; the plurality of second sensing electrodes overlapping the plurality of first sensing electrodes one-on-one.

### Claim 8 (depends on 7)

The method of claim 7, further comprising: forming an isolating layer on the sensing conductive layer such that the isolating layer covers the first conductive layer; the third conductive layer and the sensing conductive layer are separated by the isolating layer.

### Claim 9 (depends on 7)

The method of claim 7, wherein a step of forming the sensing conductive layer on the insulating layer comprises: forming the sensing conductive layer and a plurality of third driving electrodes on the insulating layer simultaneously; forming the plurality of third driving electrodes and the sensing conductive layer simultaneously with the same conductive material; the plurality of third driving electrodes being not connected to each other nor to the sensing conductive layer.

### Claim 10 (depends on 7)

The method of claim 7, wherein the first conductive layer is indium tin oxide or indium zinc oxide or silver nanowires (AgNW).

### Claim 11 (depends on 7)

The method of claim 7, wherein the plurality of second sensing electrodes and the third conductive layer are simultaneously formed by a second conductive material.

### Claim 12 (depends on 11)

The method of claim 11, wherein the second conductive material is a metal mesh.