# US 2010/0164903 A1 · Electrophoresis display device

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- Number: US 2010/0164903 A1
- Document ID: US20100164903A1
- Status: Published application
- Kind: A1
- Application number: 12/629,460
- Filed: 2009-12-02
- Published: 2010-07-01
- Earliest claimed: 2008-12-30
- Assignees: LG Display Co., Ltd.
- Inventors: Jong Kwon Lee; Seung Seok Nam; Sang Soo Kim
- Web page: https://patentgrep.com/patent/US20100164903A1

## CPC

- G02F 1/167: by electrophoresis
- G06F 3/0412: {Digitisers structurally integrated in a display}
- G06F 3/0447: {Position sensing using the local deformation of sensor cells}
- G02F 1/13338: {Input devices, e.g. touch panels}
- 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)

## Abstract

An electrophoresis display device adapted to prevent sensing errors and to reduce electric power consumption is disclosed. The electrophoresis display device includes a thin film transistor array substrate and an ink film. The thin film transistor array substrate includes a sensor configured to generate a sensing signal, and an output transistor configured to be connected to the sensor and to control the output of the sensing signal. The ink film includes a common electrode and an ink layer, which are formed on one side surface of a base film, and a floating electrode formed on the other side surface of the base film. The output transistor outputs the sensing signal when a touch current is generated on the floating electrode. The electrophoresis display device only outputs the sensing signal when a substantial touch occurs. Therefore, the electrophoresis display device can prevent sensing errors and reduce electric power consumption.

## Claims

### Claim 1

An electrophoresis display device comprising:
a thin film transistor array substrate having a sensor configured to generate a sensing signal, and an output transistor configured to connect the sensor and to control the output of the sensing signal; and
an ink film having a common electrode and an ink layer sequentially formed on a first side surface of a base film, and a floating electrode formed on a second side surface of the base film,
wherein the output transistor outputs the sensing signal when a touch current is generated on the floating electrode.

### Claim 2 (depends on 1)

The electrophoresis display device according to claim 1, wherein the common electrode, the base film, and the floating electrode configure a touch capacitor.

### Claim 3 (depends on 2)

The electrophoresis display device according to claim 2, wherein the capacitance of the touch capacitor varies when being touched and the capacitor then generates the touch current on the floating electrode.

### Claim 4 (depends on 1)

The electrophoresis display device according to claim 1, wherein the floating electrode has a ground voltage and the touch current is generated on the floating electrode by a common voltage applied onto the common electrode, when being touched.

### Claim 5 (depends on 1)

The electrophoresis display device according to claim 1, further comprising
a controller configured to identify the touch current and to generate a touch control signal of a high level; and
an output control signal generator configured to respond to the touch control signal and to generate an output control signal of a high level, wherein the output transistor is turned on by the output control signal.

### Claim 6 (depends on 1)

The electrophoresis display device according to claim 1, wherein the base film comprises a plastic material with a fixed dielectric constant.