# US 11,232,728 B2 · Display panel and crack detecting method thereof, display apparatus

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- Number: US 11,232,728 B2
- Document ID: US11232728B2
- Status: Granted
- Kind: B2
- Application number: 16/486,820
- Filed: 2019-01-08
- Published: 2020-02-27
- Granted: 2022-01-25
- Earliest claimed: 2018-05-17
- Assignees: Boe Technology Group Co., Ltd.
- Applicants: Boe Technology Group Co., Ltd.
- Inventors: Xueguang Hao; Yong Qiao; Xinyin Wu
- Web page: https://patentgrep.com/patent/US11232728B2

## CPC

- G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)}
- G01N 27/00: Investigating or analysing materials by the use of electric, electrochemical, or magnetic means (G01N3/00 – G01N25/00 take precedence; measurement or testing of electric or magnetic variables or of electric or magnetic properties of materials G01R)
- G09G 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 3/3275: Details of drivers for data electrodes
- H10K 59/88: Dummy elements, i.e. elements having non-functional features
- H10K 71/70: Testing, e.g. accelerated lifetime tests
- G09G 2300/0413: Details of dummy pixels or dummy lines in flat panels
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2320/04: Maintaining the quality of display appearance
- G09G 2330/02: Details of power systems and of start or stop of display operation
- G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof
- H10K 59/131: Interconnections, e.g. wiring lines or terminals
- 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)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display panel and a crack detecting method, and a display device are disclosed. The display panel includes a display region and a peripheral region surrounding the display region, the peripheral region being provided with a crack detection circuit structure, the crack detection circuit structure including a detection circuit wire and a first detection switching circuit, the display panel includes a first sub-pixel and a first data line electrically connected to the first sub-pixel, a first end of the first data line is electrically connected to a first end of the detection circuit, a second end of the first data line is electrically connected to a second end of the detection circuit wire through the first detection switching circuit and the second end of the detection circuit wire is configured to receive a detection voltage.

## Claims

### Claim 1

A display panel, comprising a display region and a peripheral region surrounding the display region, the peripheral region being provided with a crack detection circuit structure, the crack detection circuit structure comprising a detection circuit wire and a first detection switching circuit,
wherein the display panel comprises a first sub-pixel and a first data line electrically connected to the first sub-pixel, the first data line comprises a first end and a second end, the first end and the second end are two opposite ends of the first data line along an extending direction of the first data line,
the detection circuit wire comprises a first end and a second end, the first end of the detection circuit wire is located at a side of the display region away from the first detection switching circuit, and the second end of the detection circuit wire is located at a side of the display region away from the first end of the detection circuit wire, the first end of the first data line is directly connected to the first end of the detection circuit wire,
the first detection switching circuit comprises a thin film transistor, a source electrode of the thin film transistor is connected to the second end of the detection circuit wire, a drain electrode of the thin film transistor is directly connected to the second end of the first data line, the second end of the detection circuit wire is configured to receive a detection voltage.

### Claim 2 (depends on 1)

The display panel according to claim 1, wherein the detection voltage is equal to a power supply voltage.

### Claim 3 (depends on 1)

The display panel according to claim 1, further comprising a voltage applying portion, wherein the voltage applying portion is electrically connected to the second end of the detection circuit wire and is configured to apply the detection voltage to the detection circuit wire.

### Claim 4 (depends on 3)

The display panel according to claim 3, wherein the voltage applying portion comprises a first contact pad disposed in the peripheral region,
the first contact pad is configured to contact a detection probe.

### Claim 5 (depends on 3)

The display panel according to claim 3, wherein the voltage applying portion comprises a first contact pad disposed in the peripheral region, the first contact pad is configured to be electrically connected to a drive circuit board.

### Claim 6 (depends on 1)

The display panel according to claim 1 further comprising an on-off signal applying portion, wherein the on-off signal applying portion is electrically connected to a control terminal of the first detection switching circuit, and is configured to apply an on/off signal to the first detection switching circuit so as to control on or off state of the first detection switching circuit.

### Claim 7 (depends on 6)

The display panel according to claim 6, wherein the on-off signal applying portion comprises a second contact pad disposed in the peripheral region,
the second contact pad is configured to contact a detection probe or to be electrically connected to a drive circuit board.

### Claim 8 (depends on 6)

The display panel according to claim 6, wherein the voltage applying portion comprises a second contact pad disposed in the peripheral region,
the second contact pad is configured to be electrically connected to a drive circuit board.

### Claim 9 (depends on 7)

The display panel according to claim 7, wherein the first detection switching circuit comprises at least one thin film transistor,
a gate electrode of the thin film transistor is electrically connected to the on-off signal applying portion,
one of a source electrode and a drain electrode of the thin film transistor is electrically connected to the first data line, and the other one of the source electrode and the drain electrode of the thin film transistor is electrically connected to the second end of the detection circuit wire.

### Claim 10 (depends on 7)

The display panel according to claim 7, further comprising a resistance element, wherein the resistance element is connected between the second end of the first data line and the first detection switching circuit, or connected between the first detection switching circuit and the second end of the detection circuit wire.

### Claim 11 (depends on 1)

The display panel according to claim 1, wherein the detection circuit wire is disposed to surround the display region.

### Claim 12 (depends on 1)

The display panel according to claim 1, wherein the detection circuit wire comprises a serpentine structure.

### Claim 13 (depends on 7)

The display panel according to claim 7, wherein the display region is further provided with a second sub-pixel and a second data line electrically connected to the second sub-pixel,
the display panel further comprises a second detection switching circuit, and the on-off signal applying portion is connected to a control terminal of the second detection switching circuit,
the second data line is electrically connected to the second detection switching circuit and is capable of receiving a data signal of the display panel for display of a black picture or a white picture through the second detection switching circuit.

### Claim 14 (depends on 13)

The display panel according to claim 13, wherein luminous color of the first sub-pixel and the second sub-pixel differs.

### Claim 15 (depends on 13)

The display panel according to claim 13, wherein each of the first sub-pixel and the second sub-pixel comprises a pixel driving circuit and an organic light emitting element, and the pixel driving circuit is configured not to output a driving current upon the received display data voltage being equal to a power supply voltage.

### Claim 16 (depends on 1)

A display apparatus, comprising the display panel according to claim 1.

### Claim 17 (depends on 1)

A crack detecting method of a display panel, wherein the display panel is the display panel according to claim 1, the method comprises:
displaying a black picture by using the display panel, turning on the first detection switching circuit, and applying the detection voltage to the second end of the detection circuit wire; or
displaying a white picture by using the display panel, turning on the first detection switching circuit, and applying the detection voltage to the second end of the detection circuit wire.

### Claim 18 (depends on 17)

The crack detecting method according to claim 17, wherein in a case of displaying the black picture, if the first sub-pixel emits light, then it is judged that a crack appears in the peripheral region; or,
in a case of displaying the white picture, if the first sub-pixel does not emit light, then it is judged that no crack appears in the peripheral region.

### Claim 19 (depends on 1)

The crack detecting method according to claim 1, wherein the first sub-pixel and the first data line are located in the display region.