# US 12,225,801 B2 · Mitigating induced emission in OLED display

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- Number: US 12,225,801 B2
- Document ID: US12225801B2
- Status: Granted
- Kind: B2
- Application number: 17/657,288
- Filed: 2022-03-30
- Published: 2023-06-22
- Granted: 2025-02-11
- Earliest claimed: 2021-12-17
- Assignees: Microsoft Technology Licensing, LLC
- Applicants: Microsoft Technology Licensing, LLC
- Inventors: Younghun Paik; Baek Woon Lee; Hyungsoo Kim; Ying Zheng
- Web page: https://patentgrep.com/patent/US12225801B2

## CPC

- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 59/40: OLEDs integrated with touch screens
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 2102/103: {comprising indium oxides, e.g. ITO}
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

Examples are disclosed that relate to mitigating a piezoelectric response of an organic light emitting diode (OLED) display from static charge. One example provides an electronic device, comprising an organic light emitting diode (OLED) display, the OLED display comprising an organic light emitting layer, a thin film transistor (TFT), a polyimide layer disposed on an opposite side of the TFT as the organic light emitting layer, a buffer layer between the TFT and the polyimide layer, and a conductor positioned to mitigate a piezoelectric response of the polyimide layer to static charge on the OLED display.

## Claims

### Claim 1

An electronic device, comprising:
an organic light emitting diode (OLED) display, the OLED display comprising
an organic light emitting layer;
a thin film transistor (TFT);
a polyimide layer disposed on an opposite side of the TFT as the organic light emitting layer;
a buffer layer between the TFT and the polyimide layer; and
a conductor positioned to mitigate a piezoelectric response of the polyimide layer to static charge on the electronic device, wherein the conductor connects the polyimide layer to ground via a ground line of the TFT.

### Claim 2 (depends on 1)

The electronic device of claim 1, wherein the conductor comprises a conductive layer formed on the polyimide layer.

### Claim 3 (depends on 2)

The electronic device of claim 2, wherein the conductive layer comprises molybdenum.

### Claim 4 (depends on 3)

The electronic device of claim 3, wherein the conductor comprises a conductive ink.

### Claim 5 (depends on 1)

The electronic device of claim 1, wherein the conductor contacts an edge of the polyimide layer.

### Claim 6 (depends on 1)

The electronic device of claim 1, wherein the conductor comprises a conductive layer disposed on the buffer layer and separated from the polyimide layer.

### Claim 7 (depends on 6)

The electronic device of claim 6, wherein the conductive layer comprises one or more of aluminum, copper, molybdenum, or indium tin oxide.

### Claim 8 (depends on 6)

The electronic device of claim 6, wherein the conductive layer is located between a silicon nitride layer and a silicon oxide layer of the buffer layer.

### Claim 9 (depends on 1)

The electronic device of claim 1, wherein the electronic device comprises a mobile display device.

### Claim 10

An electronic device, comprising:
an organic light emitting diode (OLED) display, the OLED display comprising
an organic light emitting layer;
a thin film transistor (TFT);
a polyimide layer disposed on an opposite side of the TFT as the organic light emitting layer;
a buffer layer between the TFT and the polyimide layer; and
a conductive shield layered on the buffer layer, the conductive shield configured to mitigate a piezoelectric response of the polyimide layer to static charge on the OLED display, wherein the conductive shield is located between a silicon nitride layer and a silicon oxide layer of the buffer layer.

### Claim 11 (depends on 10)

The electronic device of claim 10, wherein the conductive shield comprises one or more of aluminum, copper, molybdenum, or indium tin oxide.

### Claim 12

An electronic device, comprising:
an organic light emitting diode (OLED) display, the OLED display comprising
an organic light emitting layer;
a thin film transistor (TFT);
a polyimide layer disposed on an opposite side of the TFT as the organic light emitting layer;
a buffer layer between the TFT and the polyimide layer; and
a conductor in contact with the polyimide layer to connect the polyimide layer to an electrical ground of the OLED display, wherein the conductor connects to a ground line of the TFT.

### Claim 13 (depends on 12)

The electronic device of claim 12, wherein the conductor comprises one or more of aluminum, copper, molybdenum, or indium tin oxide.

### Claim 14 (depends on 12)

The electronic device of claim 12, wherein the conductor comprises a conductive layer formed on the polyimide layer.

### Claim 15 (depends on 12)

The electronic device of claim 12, wherein the conductor contacts an edge of the polyimide layer.

### Claim 16 (depends on 15)

The electronic device of claim 15, wherein the conductor comprises a conductive ink.