# US 11,907,460 B2 · Touch sensing type display device

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- Number: US 11,907,460 B2
- Document ID: US11907460B2
- Status: Granted
- Kind: B2
- Application number: 18/122,092
- Filed: 2023-03-15
- Published: 2023-07-06
- Granted: 2024-02-20
- Earliest claimed: 2010-03-19
- Assignees: LG Display Co., Ltd.
- Applicants: LG Display Co., Ltd.
- Inventors: Kum-Mi Oh; Jin-Wuk Kim; Sung-Hee Kim
- Web page: https://patentgrep.com/patent/US11907460B2

## CPC

- G06F 3/0412: {Digitisers structurally integrated in a display}
- G02F 1/133345: {Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence)}
- G02F 1/13338: {Input devices, e.g. touch panels}
- G02F 1/134309: {characterised by their geometrical arrangement}
- G02F 1/134363: {for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]}
- G02F 1/136204: {Arrangements to prevent high voltage or static electricity failures}
- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G06F 3/047: using sets of wires, e.g. crossed wires
- H10D 86/441: {Interconnections, e.g. scanning lines}
- H10D 86/60: wherein the TFTs are in active matrices
- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/133514: {Colour filters}
- G02F 1/134318: {having a patterned common electrode}
- G02F 1/134372: {for fringe field switching [FFS] where the common electrode is not patterned}
- G02F 1/136295: {Materials; Compositions; Manufacture processes}
- G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)}
- G02F 2201/121: common or background
- G02F 2201/123: pixel
- G02F 2202/22: Antistatic materials or arrangements
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- 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
- H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES

## Abstract

A touch sensing type liquid crystal display device includes an array substrate includes a first substrate, a common electrode, a pixel electrode, and a touch sensing unit; a color filter substrate including a second substrate and facing the array substrate; an anti-static layer on an outer side of the second substrate and including an organic material and a carbon nano-tube; and a liquid crystal layer between the first substrate and an inner side of the second substrate.

## Claims

### Claim 1

A display device, comprising:
a first substrate and a second substrate facing each other;
a plurality of first electrodes and a plurality of second electrodes disposed between the first substrate and the second substrate;
a third electrode disposed on at least one of the first substrate and the second substrate;
a plurality of first conductive lines and a plurality of second conductive lines, one of the plurality of second conductive lines being electrically connected to one of the plurality of second electrodes;
a plurality of third conductive lines extending along a direction different from a direction of the first conductive lines; and
a thin film transistor including a semiconductor layer, a gate electrode, a source electrode, and a drain electrode,
wherein the third electrode overlaps the plurality of first electrodes and the plurality of second electrodes in a plan view,
wherein a sheet resistance of the third electrode is greater than a sheet resistance of the plurality of first electrodes and the plurality of second electrodes,
wherein the plurality of second conductive lines extend along the plurality of first conductive lines, respectively, and
wherein one of the first conductive lines is electrically connected to the source electrode, and one of the third conductive lines is electrically connected to the gate electrode.

### Claim 2 (depends on 1)

The display device of claim 1, wherein a minimum distance between the plurality of first electrodes and the plurality of second electrodes is less than a minimum distance between the third electrode and the plurality of second electrodes.

### Claim 3 (depends on 1)

The display device of claim 1, wherein the plurality of second electrodes include a plurality of first sub-electrodes and a plurality of second sub-electrodes, and
wherein the display device is configured to be driven by a voltage of the plurality of first electrodes and the plurality of first sub-electrodes.

### Claim 4 (depends on 3)

The display device of claim 3, wherein the plurality of first sub-electrodes group into a first touch block defining a first unit region for touch sensing, and the first touch block overlaps with at least one of the plurality of second conductive lines.

### Claim 5 (depends on 4)

The display device of claim 4, wherein the plurality of second sub-electrodes group into a second touch block defining a second unit region for touch sensing.

### Claim 6 (depends on 5)

The display device of claim 5, wherein the first touch block is separated from the second touch block.

### Claim 7 (depends on 4)

The display device of claim 4, wherein the plurality of first sub-electrodes are arranged along the plurality of first conductive lines and are electrically connected by at least one of the plurality of second conductive lines.

### Claim 8 (depends on 4)

The display device of claim 4, wherein the first touch block includes a plurality of pixel regions.

### Claim 9 (depends on 3)

The display device of claim 3, wherein the plurality of first sub-electrodes is separated from the plurality of second sub-electrodes.

### Claim 10 (depends on 1)

The display device of claim 1, wherein the third electrode serves as a conductive path for static electricity or an insulating layer for sensing a touch position.

### Claim 11 (depends on 1)

The display device of claim 1, wherein the sheet resistance of the third electrode has a range of about 106 to 109 ohms per square (Ω/sq).

### Claim 12 (depends on 1)

The display device of claim 1, further comprising:
a liquid crystal layer between the first and second substrates,
wherein the plurality of first electrodes, the plurality of second electrodes, the plurality of first conductive lines, and the plurality of second conductive lines are disposed on the first substrate.

### Claim 13 (depends on 12)

The display device of claim 12, wherein the third electrode is disposed on an outer side of the second substrate.

### Claim 14 (depends on 1)

The display device of claim 1, wherein the plurality of first electrodes are disposed between the plurality of second electrodes and the third electrode.

### Claim 15 (depends on 1)

The display device of claim 1, wherein the one of the plurality of second conductive lines is disposed on the one of the plurality of second electrodes.