# US 11,114,003 B2 · Foldable OLED display panel

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- Number: US 11,114,003 B2
- Document ID: US11114003B2
- Status: Granted
- Kind: B2
- Application number: 16/640,887
- Filed: 2020-01-13
- Published: 2021-05-13
- Granted: 2021-09-07
- Earliest claimed: 2020-01-13
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Yuan Zheng
- Web page: https://patentgrep.com/patent/US11114003B2

## CPC

- G09G 3/035: {for flexible display surfaces}
- G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads}
- G09G 3/3225: using an active matrix
- G09G 3/3266: Details of drivers for scan electrodes
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- H10K 77/111: {Flexible substrates}
- 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
- G09G 2300/0408: Integration of the drivers onto the display substrate
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2380/02: Flexible displays
- H10K 59/123: Connection of the pixel electrodes to the thin film transistors [TFT]
- H10K 2102/311: {Flexible OLED}
- Y02E 10/549: Organic PV cells
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A foldable organic light-emitting diode (OLED) display panel is provided. The foldable OLED display panel includes a display region having a folded region, and further including a plurality rows of pixel units, a plurality of signal lines, and gate on array (GOA) unit circuits of a plurality of stage, wherein the GOA unit circuits of each stage are electrically connected to the corresponding rows of the pixel units by the signal lines; the signal lines further include first sub-signal lines overlapping the folded region, and the first sub-signal lines are configured to be waveform lines, or surfaces of the first sub-signal lines are provided with through holes.

## Claims

### Claim 1

A foldable organic light-emitting diode (OLED) display panel, comprising:
a display region having a folded region and a non-folded region, and further including a plurality of rows of pixel units, a plurality of signal lines, and gate on array (GOA) unit circuits of a plurality of stages,
wherein the GOA unit circuits of each stage are electrically connected to a corresponding row of the pixel units by the signal lines, and the GOA unit circuits of each stage are configured to drive the corresponding rows of the pixel units;
wherein the signal lines further comprise first sub-signal lines overlapping the folded region, and the first sub-signal lines are configured to be waveform lines, or surfaces of the first sub-signal lines are provided with through holes;
wherein the signal lines further comprise second sub-signal lines overlapping the non-folded region and the second sub-signal lines are straight lines.

### Claim 2 (depends on 1)

The foldable OLED display panel as claimed in claim 1, wherein the through holes on the surfaces of the first sub-signal lines are disposed in a single row, and the through holes are arranged along bending paths of the first sub-signal lines.

### Claim 3 (depends on 1)

The foldable OLED display panel as claimed in claim 1, wherein the through holes on the surfaces of the first sub-signal lines are disposed in a double row, and the through holes are arranged along bending paths of the first sub-signal lines.

### Claim 4 (depends on 2)

The foldable OLED display panel as claimed in claim 2, wherein shapes of the through holes are round or oval.

### Claim 5 (depends on 3)

The foldable OLED display panel as claimed in claim 3, wherein shapes of the through holes are round or oval.

### Claim 6 (depends on 1)

The foldable OLED display panel as claimed in claim 1, wherein the signal lines comprise GOA signal lines, pixel unit signal lines and power signal lines.

### Claim 7 (depends on 1)

The foldable OLED display panel as claimed in claim 1, wherein an input signal in the GOA unit circuits of a Nth stage is provided by an output signal of the GOA unit circuits of a N−1th stage, and a switching signal of the pixel unit of a Nth row and an input signal of the GOA unit circuits of a N+1th stage are provided by an output signal of the GOA unit circuits of the Nth stage.

### Claim 8 (depends on 1)

The foldable OLED display panel as claimed in claim 1, wherein a buffer layer, an active layer, a first gate insulating layer, a first gate metal layer, a second gate insulating layer, a second gate metal layer, an interlayer insulating layer, a source-drain metal layer, a passivation layer and an anode metal layer are disposed from down to up on a flexible substrate of the folded region, wherein first through holes are disposed at two ends of an edge of the active layer, second through holes are disposed on the first gate metal layer, third through holes are disposed on the second gate metal layer, and fourth through holes are disposed on the source-drain metal layer.

### Claim 9 (depends on 8)

The foldable OLED display panel as claimed in claim 8, wherein the source-drain metal layer is electrically connected to the active layer via the first through holes, the source-drain metal layer is electrically connected to the first gate metal layer via the second through holes, the source-drain metal layer is electrically connected to the second gate metal layer via the third through holes, and the anode metal layer is electrically connected to the source-drain metal layer via the fourth through holes.

### Claim 10 (depends on 8)

The foldable OLED display panel as claimed in claim 8, wherein a material of each of the first sub-signal lines is same as a material of each of the source-drain metal layer lines.

### Claim 11

A foldable OLED display panel, comprising: a display region having a folded region and a non-folded region, and further including a plurality of rows of pixel units, a plurality of signal lines, and gate on GOA unit circuits of a plurality of stages, wherein the GOA unit circuits of each stage are electrically connected to a corresponding row of the pixel units by the signal lines, and the GOA unit circuits of each stage are configured to drive the corresponding rows of the pixel units;
wherein the signal lines further comprise first sub-signal lines overlapping the folded region, and the first sub-signal lines are configured to be waveform lines, or surfaces of the first sub-signal lines are provided with through holes.

### Claim 12 (depends on 11)

The foldable OLED display panel as claimed in claim 11, wherein the through holes on the surfaces of the first sub-signal lines are disposed in a single row, and the through holes are arranged along bending paths of the first sub-signal lines.

### Claim 13 (depends on 11)

The foldable OLED display panel as claimed in claim 11, wherein the through holes on the surfaces of the first sub-signal lines are disposed in a double row, and the through holes are arranged along bending paths of the first sub-signal lines.

### Claim 14 (depends on 12)

The foldable OLED display panel as claimed in claim 12, wherein shapes of the through holes are round or oval.

### Claim 15 (depends on 13)

The foldable OLED display panel as claimed in claim 13, wherein shapes of the through holes are round or oval.

### Claim 16 (depends on 11)

The foldable OLED display panel as claimed in claim 11, wherein the signal lines comprise GOA signal lines, pixel unit signal lines and power signal lines.

### Claim 17 (depends on 11)

The foldable OLED display panel as claimed in claim 11, wherein an input signal in the GOA unit circuits of a Nth stage is provided by an output signal of the GOA unit circuits of a N−1th stage, and a switching signal of the pixel unit of a Nth row and an input signal of the GOA unit circuits of a N+1th stage are provided by an output signal of the GOA unit circuits of the Nth stage.

### Claim 18 (depends on 11)

The foldable OLED display panel as claimed in claim 11, wherein a buffer layer, an active layer, a first gate insulating layer, a first gate metal layer, a second gate insulating layer, a second gate metal layer, an interlayer insulating layer, a source-drain metal layer, a passivation layer and an anode metal layer are disposed from down to up on a flexible substrate of the folded region, wherein first through holes are disposed at two ends of an edge of the active layer, second through holes are disposed on the first gate metal layer, third through holes are disposed on the second gate metal layer, and fourth through holes are disposed on the source-drain metal layer.

### Claim 19 (depends on 18)

The foldable OLED display panel as claimed in claim 18, wherein the source-drain metal layer is electrically connected to the active layer via the first through holes, the source-drain metal layer is electrically connected to the first gate metal layer via the second through holes, the source-drain metal layer is electrically connected to the second gate metal layer via the third through holes, and the anode metal layer is electrically connected to the source-drain metal layer via the fourth through holes.

### Claim 20 (depends on 18)

The foldable OLED display panel as claimed in claim 18, wherein a material of each of the first sub-signal lines is same as a material of each of the source-drain metal layer lines.