# US 10,768,730 B2 · Display device and inspection method of bonding resistance

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- Number: US 10,768,730 B2
- Document ID: US10768730B2
- Status: Granted
- Kind: B2
- Application number: 16/044,021
- Filed: 2018-07-24
- Published: 2019-07-11
- Granted: 2020-09-08
- Earliest claimed: 2018-01-10
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Young Bin Kim
- Web page: https://patentgrep.com/patent/US10768730B2

## CPC

- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 1/1626: {with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]}
- G06F 1/1637: {Details related to the display arrangement, including those related to the mounting of the display in the housing}
- G06F 1/1643: {the display being associated to a digitizer, e.g. laptops that can be used as penpads (details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615)}
- G06F 3/03547: {Touch pads, in which fingers can move on a surface}
- G06F 3/04164: {Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads}
- G06F 3/0443: {using a single layer of sensing electrodes}
- 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 3/3258: with pixel circuitry controlling the voltage across the light-emitting element
- G09G 3/3275: Details of drivers for data electrodes
- H10W 72/075: {of bond wires}
- B23K 20/004: {Wire welding}
- 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
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- G09G 2310/0264: Details of driving circuits
- 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)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

A display device includes a plurality of pixels, a plurality of data lines connected to the pixels, an inspection circuit unit connected to the data lines, a driving circuit unit connected or configured to be connectable to the data lines, a bonding region comprising a first pad, a second pad, a third pad, and a fourth pad, the first pad and the second pad being electrically connected to each other through a first conductor, and the third pad and the fourth pad being electrically connected to each other through a second conductor, a first wire connected to the driving circuit unit and the third pad, a second wire connected to the driving circuit unit and the inspection circuit unit and a third wire connected to the inspection circuit unit and the first pad, where the second pad and the fourth pad are electrically connected to each other.

## Claims

### Claim 1

A display device comprising:
a first substrate including a display area and a peripheral area outside the display area,
a plurality of pixels disposed in the display area;
a plurality of data lines connected to the plurality of pixels;
an inspection circuit unit disposed in a peripheral area outside the display area and connected to the data lines;
a driving circuit unit disposed in the peripheral area and connected or configured to be connectable to the data lines;
a first wire and a second wire disposed on the first substrate and connected to the driving circuit unit;
a third wire disposed on the first substrate connected to the inspection circuit unit; and
a bonding region disposed in the peripheral area and comprising a plurality of pads,
wherein the inspection circuit unit comprises a first switching element and a second switching element,
the first switching element is electrically connected to a first data line among the plurality of data lines and electrically connected to the third wire,
the second switching element is electrically connected to a second data line among the plurality of data lines and electrically connected to the second wire,
the plurality of pads comprises a first pad, a second pad, a third pad, and a fourth pad,
the first pad and the second pad are electrically connected to each other via a first conductor,
the third pad and the fourth pad are electrically connected to each other via a second conductor,
the second pad and the fourth pad are disposed on a second substrate and are electrically connected to each other through a connection part disposed on the second substrate, and
the first pad is disposed on the first substrate and electrically connected to the third wire, and the third pad is disposed on the first substrate and electrically connected to the first wire.

### Claim 2 (depends on 1)

The display device of claim 1, wherein
a color represented by pixels connected to the first data line among the plurality of pixels and a color represented by pixels connected to the second data line among the plurality of pixels are different from each other.

### Claim 3 (depends on 2)

The display device of claim 2, wherein
the second wire comprises a matching resistor having a resistance corresponding to a normal bonding resistance of the bonding region.

### Claim 4 (depends on 3)

The display device of claim 3, further comprising
a fourth wire connected to the driving circuit unit,
wherein the fourth wire is electrically connected to control terminals of the first and second switching elements in the inspection circuit unit.

### Claim 5 (depends on 1)

The display device of claim 1, wherein
the first wire and the second wire are connected to each other at a node.

### Claim 6 (depends on 1)

The display device of claim 1, wherein
the first conductor and the second conductor comprise conductive balls included in an anisotropic conductive film disposed between the at first substrate and the second substrates.

### Claim 7 (depends on 1)

The display device of claim 1, wherein
the first substrate and the second substrate are bonded to each other in the bonding region, and
the inspection circuit unit is disposed on the first substrate.

### Claim 8 (depends on 1)

The display device of claim 1, wherein
the first substrate and the second substrate are bonded to each other on the bonding region,
a third substrate bonded and electrically connected to the first substrate is further comprised.

### Claim 9 (depends on 1)

The display device of claim 1, wherein
the first substrate and the second substrate are bonded to each other in the bonding region, and
a third substrate bonded to the second substrate is further comprised.

### Claim 10 (depends on 9)

The display device of claim 9, further comprising
a touch sensing layer disposed on first substrate,
wherein the third substrate is electrically connected to a pad unit of the touch sensing layer.

### Claim 11 (depends on 1)

The display device of claim 1, wherein
at least one pad among the first pad, the second pad, the third pad, and the fourth pad is disposed closer to an edge than to a center of the bonding region.

### Claim 12 (depends on 1)

The display device of claim 1, wherein
each of the first substrate and the second substrates is of a flexible film type.

### Claim 13

A display device comprising:
a display panel comprising a first substrate including a display area and a peripheral area disposed outside the display area;
a first circuit board including a second substrate bonded to the display panel; and
a second circuit board including a third substrate bonded to the first circuit board,
wherein the display panel comprises
a plurality of pixels disposed in the display area,
a plurality of data lines connected to the plurality of pixels,
an inspection circuit unit disposed in the peripheral area and connected to the data lines,
a driving circuit unit disposed in the peripheral area,
a first wire and a second wire connected to the driving circuit unit, and
a third wire connected to the inspection circuit unit,
the first circuit board and the second circuit board comprise a bonding region comprising a plurality of pads,
the inspection circuit unit comprises a first switching element and a second switching element,
the first switching element is electrically connected to a first data line among the plurality of data lines and to the third wire,
the second switching element is electrically connected to a second data line among the plurality of data lines and to the second wire,
the plurality of pads comprises a first pad, a second pad, a third pad, and a fourth pad, the first pad and the second pad being electrically connected to each other via a first conductor, and the third pad and the fourth pad being electrically connected to each other via a second conductor,
the second pad and the fourth pad are disposed at the second circuit board and are electrically connected to each other, and
the first pad is electrically connected to the third wire, and the third pad is electrically connected to the first wire.

### Claim 14 (depends on 13)

The display device of claim 13, wherein
a color represented by pixels connected to the first data line among the plurality of pixels and a color represented by pixels connected to the second data line among the plurality of pixels are different from each other.

### Claim 15 (depends on 14)

The display device of claim 14, wherein
the second wire comprises a matching resistor having a resistance corresponding to a normal bonding resistance of the bonding region.

### Claim 16 (depends on 15)

The display device of claim 15, further comprising
a fourth wire connected to the driving circuit unit,
wherein the fourth wire is electrically connected to control terminals of the first and second switching elements in the inspection circuit unit.

### Claim 17

A display device comprising:
a plurality of pixels;
a plurality of data lines connected to the plurality of pixels;
an inspection circuit unit connected to the plurality of data lines;
a driving circuit unit connected or configured to be connectable to the plurality of data lines;
a bonding region comprising a first pad, a second pad, a third pad, and a fourth pad, the first pad and the second pad being electrically connected to each other through a first conductor, and the third pad and the fourth pad being electrically connected to each other through a second conductor;
a first wire connected to the driving circuit unit and the third pad;
a second wire connected to the driving circuit unit and the inspection circuit unit; and
a third wire connected to the inspection circuit unit and the first pad,
wherein the second pad and the fourth pad are electrically connected to each other.

### Claim 18 (depends on 17)

The display device of claim 17, wherein
the first switching element is electrically connected to a first data line among the plurality of data lines and to the third wire,
the second switching element is electrically connected to a second data line among the plurality of data lines and to the second wire, and
a color represented by pixels connected to the first data line among the plurality of pixels and a color represented by pixels connected to the second data line among the plurality of pixels are different from each other.

### Claim 19

An inspection method of a bonding resistance, in a display device comprising a plurality of pixels, a plurality of data lines connected to the plurality of pixels, an inspection circuit unit connected to the plurality of data lines, a driving circuit unit connected or configured to be connectable to the plurality of data lines, a bonding region comprising a first pad and a second pad electrically connected to each other through a first conductor, and a third pad and a fourth pad electrically connected to each other through a second conductor, a first wire connected to the driving circuit unit and the third pad, a second wire connected to the driving circuit unit and the inspection circuit unit, and a third wire connected to the inspection circuit unit and the first pad, wherein the second pad and the fourth pad are electrically connected to each other, the method comprising:
applying, by the driving circuit unit, a first inspection data voltage of a first gray level to the first wire and the second wire;
applying, by the driving circuit unit, a second inspection data voltage of a second gray level to the first wire and the second wire; and
inspecting a lighting state of the plurality of pixels and determining whether a bonding resistance of the bonding region is normal.

### Claim 20 (depends on 19)

The inspection method of claim 19, wherein
it is determined that the bonding resistance is normal when the plurality of pixels entirely emit light of a same gray level, and
it is determined that the bonding resistance is abnormal when pixels electrically connected to the third wire among the plurality of pixels emit light of different luminance from light emitted by the other pixels of the plurality of pixels.