# US 10,768,462 B2 · In-cell touch liquid crystal display device and method of manufacturing the same

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- Number: US 10,768,462 B2
- Document ID: US10768462B2
- Status: Granted
- Kind: B2
- Application number: 15/720,516
- Filed: 2017-09-29
- Published: 2018-04-05
- Granted: 2020-09-08
- Earliest claimed: 2016-09-30
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Jongsang Pyo; Chulsang Shin; Jeheon Cha
- Web page: https://patentgrep.com/patent/US10768462B2

## CPC

- G02F 1/13338: {Input devices, e.g. touch panels}
- G02F 1/133514: {Colour filters}
- G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)}
- 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 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/044: by capacitive means
- G06F 3/0443: {using a single layer of sensing electrodes}
- H10D 86/40: characterised by multiple TFTs
- H10D 86/60: wherein the TFTs are in active matrices
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- G06F 2203/04107: Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

An in-cell touch LCD device and a method of manufacturing the same are discussed. The in-cell touch LCD device may implement a screen display and a screen touch through a thin-film transistor substrate, which has an area larger than that of a color filter substrate, thus improving touch performance and ESD performance and simplifying a manufacturing process and reducing manufacturing costs.

## Claims

### Claim 1

An in-cell touch liquid crystal display device, comprising:
a lower substrate;
an upper substrate disposed over the lower substrate to face the lower substrate, the upper substrate forming a display surface of the display device and having an area larger than that of the lower substrate;
a common electrode provided under the upper substrate;
a gate line and a data line provided under the upper substrate and disposed to cross each other to define a pixel area;
a touch line disposed under the upper substrate in parallel to the data line;
a thin-film transistor provided at a crossing point of the gate line and the data line;
a protective layer provided under the upper substrate including the thin-film transistor, and configured to expose a portion of a drain electrode of the thin-film transistor and a portion of each of the touch line and the common electrode;
a pixel electrode provided under the protective layer and coupled to the drain electrode; and
a coupling line coupled to the touch line and the common electrode.

### Claim 2 (depends on 1)

The in-cell touch liquid crystal display device of claim 1, further comprising:
a nitride-based insulating layer provided under the upper substrate above the common electrode.

### Claim 3 (depends on 1)

The in-cell touch liquid crystal display device of claim 1; wherein the common electrode is formed in a shape of a large-area plate.

### Claim 4 (depends on 1)

The in-cell touch liquid crystal display device of claim 1, wherein the common electrode is formed over an entire surface of a pixel area formed while the gate line and the data line cross each other.

### Claim 5 (depends on 1)

The in-cell touch liquid crystal display device of claim 1, wherein the lower substrate is a color filter substrate, and the upper substrate is a thin-film transistor substrate.

### Claim 6 (depends on 1)

The in-cell touch liquid crystal display device of claim 1, wherein an electrostatic discharge path is formed through the common electrode and a ground line of a printed circuit board coupled to the common electrode.

### Claim 7 (depends on 6)

The in-cell touch liquid crystal display device of claim 6, further comprising:
a resistor provided on the ground line of the printed circuit board that forms the electrostatic discharge path.

### Claim 8 (depends on 1)

The in-cell touch liquid crystal display device of claim 1, further comprising:
a transparent conductive layer provided on a rear surface of the lower substrate.

### Claim 9 (depends on 8)

The in-cell touch liquid crystal display device of claim 8, wherein an electrostatic discharge path is formed through the transparent conductive layer, a silver dotting part, and a ground line.

### Claim 10

A method for providing an in-cell touch liquid crystal display device, the method comprising:
providing a lower substrate, and an upper substrate having an area larger than that of the lower substrate;
forming a common electrode over the upper substrate;
forming a gate line and a data line disposed to cross each other to define a pixel area over the upper substrate;
forming a touch line disposed in parallel to the data line over the upper substrate;
forming a thin-film transistor at a crossing point of the gate line and the data line;
forming a protective layer, configured to expose a portion of a drain electrode of the thin-film transistor and a portion of each of the touch line and the common electrode, over the upper substrate including the thin-film transistor;
forming a pixel electrode coupled to the drain electrode over the protective layer;
forming a coupling line coupled to the touch line and the common electrode; and
attaching the upper substrate onto the lower substrate to face the lower substrate,
wherein the upper substrate forms a display surface of the display device.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
forming a nitride-based insulating layer over the upper substrate below the common electrode.

### Claim 12 (depends on 10)

The method of claim 10, wherein the common electrode is formed in a shape of a large-area plate.

### Claim 13 (depends on 10)

The method of claim 10, wherein the common electrode is formed over an entire surface of a pixel area formed while the gate line and the data line cross each other.

### Claim 14 (depends on 10)

The method of claim 10, wherein the lower substrate is a color filter substrate, and the upper substrate is a thin-film transistor substrate.

### Claim 15 (depends on 10)

The method of claim 10, wherein an electrostatic discharge path is formed through the common electrode and a ground line of a printed circuit board coupled to the common electrode.

### Claim 16 (depends on 15)

The method of claim 15, further comprising:
providing a resistor on the ground line of the printed circuit board that forms the electrostatic discharge path.

### Claim 17 (depends on 10)

The method of claim 10; further comprising:
forming a transparent conductive layer over a rear surface of the lower substrate.

### Claim 18 (depends on 17)

The method of claim 17, wherein an electrostatic discharge path is formed through the transparent conductive layer, a silver dotting part, and a ground line.

### Claim 19 (depends on 10)

The method of claim 10, wherein the forming of the pixel electrode coupled to the drain electrode over the protective layer and the forming of the coupling line coupled to the touch line and the common electrode are simultaneously performed through an identical mask process.

### Claim 20 (depends on 10)

The method of claim 10, wherein the forming of the data line and the forming of the touch line disposed in parallel to the data line over the upper substrate are simultaneously performed through an identical mask process.