# US 12,008,192 B2 · Display panel, touch test method, and electronic device

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- Number: US 12,008,192 B2
- Document ID: US12008192B2
- Status: Granted
- Kind: B2
- Application number: 17/284,457
- Filed: 2021-02-25
- Published: 2024-04-04
- Granted: 2024-06-11
- Earliest claimed: 2021-01-08
- Assignees: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Applicants: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
- Inventors: Jian Ye
- Web page: https://patentgrep.com/patent/US12008192B2

## CPC

- G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads}
- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/0443: {using a single layer of sensing electrodes}
- G09G 3/00: Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- 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)}
- G09G 2330/12: Test circuits or failure detection circuits included in a display system, as permanent part thereof
- G09G 2354/00: Aspects of interface with display user
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- 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)

## Abstract

A display panel, a touch test method, and an electronic device are provided. The display panel includes a substrate, touch test terminals, a multiplexing circuit, touch units, and a touch display chip. Before the touch display chip is bonded to the display panel, the multiplexing circuit is configured to reduce a number of traces of the touch units connected to the touch test terminals to facilitate execution of a touch test. In addition, a number of the touch test terminals used is reduced, which can save space occupied by a frame.

## Claims

### Claim 1

A display panel, comprising:
a substrate;
touch test terminals;
a multiplexing circuit, wherein the multiplexing circuit comprises an input end correspondingly connected to one of the touch test terminals;
touch units, wherein one of the touch units is correspondingly connected to an output end of the multiplexing circuit; and
a touch display chip, wherein one of touch output pins of the touch display chip is correspondingly connected to one of the touch units;
wherein, the touch test terminals and the multiplexing circuit are located between the substrate and the touch display chip, and the touch display chip at least partially overlaps the touch test terminals and the multiplexing circuit;
wherein the touch display chip comprises N touch output groups, one of the touch output groups comprises a plurality of the touch output pins, a distance between two adjacent touch output pins is defined as a first distance, a distance between two adjacent touch output groups is defined as a second distance, and the first distance is less than the second distance;
wherein the multiplexing circuit comprises N multiplexing sub-circuits, and one of the multiplexing sub-circuits is disposed vertically opposite to one of the touch output groups; and
wherein N is an integer greater than or equal to 2.

### Claim 2 (depends on 1)

The display panel according to claim 1, wherein the multiplexing sub-circuits comprise a plurality of multiplexing units, and any of one of the plurality of multiplexing units comprises an input end connected to a corresponding one of the touch test terminals.

### Claim 3 (depends on 2)

The display panel according to claim 2, wherein the touch display chip comprises input pins, a main body, and the touch output pins, and the input pins and the touch output pins are respectively located on two opposite sides of the main body of the touch display chip;
wherein the display panel further comprises input terminals and output terminals, one of the input pins is connected to one of the input terminals, and one of the touch output pins is connected to one of the output terminals; and
wherein the touch test terminals and the multiplexing circuit are located between the input terminals and the output terminals.

### Claim 4 (depends on 3)

The display panel according to claim 3, wherein at least one row of the input terminals and at least three rows of the output terminals are disposed on the substrate.

### Claim 5 (depends on 4)

The display panel according to claim 4, wherein the touch display chip further comprises display output pins provided on a same side as the touch output pins, and the display output pins are distributed between the touch output groups, and one of the display output pins is connected to one of the output terminals.

### Claim 6 (depends on 5)

The display panel according to claim 5, wherein the display panel comprises a display area and a frame area, the frame area comprises a bending area, and the bending area is disposed close to the display area, and
Wherein the display panel further comprises:
a touch line group comprising touch traces, wherein one of the touch traces is correspondingly connected to one of the touch output pins or one of the output terminals; and
a data line group comprising data lines, wherein one of the data lines is correspondingly connected to one of the display output pins or one of the output terminals;
wherein the touch line group and the data line group are alternately distributed in sequence, and the touch line group and the data line group are located on one side of the bending area away from the display area.

### Claim 7 (depends on 6)

The display panel according to claim 6, further comprising:
power supply line groups comprising power supply traces, wherein one of the power supply line groups is located between the touch line group and the data line group adjacent to the touch line group.

### Claim 8 (depends on 6)

The display panel according to claim 6, further comprising touch lines, wherein one of the touch lines is connected to one of the touch traces and one of the touch units; and
wherein the touch lines are equally spaced in the display area and two ends of each of the touch lines are aligned with each other.

### Claim 9 (depends on 8)

The display panel according to claim 8, wherein each of the touch units comprise touch electrodes disposed on a first metal layer, and the touch lines are disposed on the first metal layer and connected to the touch electrodes; or
each of the touch units comprise a first metal layer provided with touch electrodes, a second metal layer provided with the touch lines, and an insulating layer located between the first metal layer and the second metal layer; and wherein via holes are formed between the first metal layer and the second metal layer, and one of the touch electrodes is connected to one of the touch lines through at least one of the via holes.

### Claim 10 (depends on 1)

The display panel according to claim 1, further comprising:
multiplexing signal lines, wherein each of the multiplexing signal lines is electrically connected to a gate of a corresponding one of thin-film transistors in the multiplexing circuit; and
multiplexing test terminals, wherein one of the multiplexing signal lines is connected to at least one of the multiplexing test terminals.

### Claim 11 (depends on 10)

The display panel according to claim 10, wherein each of the multiplexing test terminals is located on one side of one of the thin-film transistors.

### Claim 12 (depends on 1)

A touch test method of the display panel according to claim 1, comprising:
providing a touch test chip, wherein the touch test chip comprises test pins, one of the test pins is correspondingly connected to one of the touch test terminals, and multiplexing signal output by the touch test chip is configured to correspondingly control the multiplexing circuit;
determining a corresponding control relationship between the multiplexing signal and the multiplexing circuit;
connecting a corresponding one of the test pins and one of the touch test terminals based on the corresponding control relationship; and
performing a touch test before installing the touch display chip.

### Claim 13 (depends on 1)

An electronic device, comprising the display panel of claim 1.

### Claim 14 (depends on 13)

The electronic device according to claim 13, wherein the display panel further comprises a polyimide substrate layer, a thin film transistor layer, an organic light-emitting functional layer, a thin film encapsulation layer, a touch functional layer, a polarizing layer, an optical adhesive layer, and a cover plate that are stacked in sequence.

### Claim 15 (depends on 14)

The electronic device according to claim 14, wherein the multiplexing sub-circuits comprise a plurality of multiplexing units, and an input end of one of the plurality of multiplexing units is connected to a corresponding one of the touch test terminals.

### Claim 16 (depends on 15)

The electronic device according to claim 15, wherein the touch display chip comprises input pins, a main body, and the touch output pins; the input pins and the touch output pins are respectively located on two opposite sides of the main body of the touch display chip;
wherein the display panel further comprises input terminals and output terminals, one of the input pins is connected to one of the input terminals, and one of the touch output pins is connected to one of the output terminals; and
wherein the touch test terminals and the multiplexing circuit are located between the input terminals and the output terminals.

### Claim 17 (depends on 16)

The electronic device according to claim 16, wherein at least one row of the input terminals and at least three rows of the output terminals are disposed on the substrate.

### Claim 18 (depends on 17)

The electronic device according to claim 17, wherein the touch display chip further comprises display output pins provided on a same side as the touch output pins, and the display output pins are distributed between the touch output groups, wherein one of the display output pins is connected to one of the output terminals.