# US 9,753,343 B2 · Liquid crystal display device having white pixel

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- Number: US 9,753,343 B2
- Document ID: US9753343B2
- Status: Granted
- Kind: B2
- Application number: 14/792,207
- Filed: 2015-07-06
- Published: 2016-06-23
- Granted: 2017-09-05
- Earliest claimed: 2014-12-18
- Assignees: Samsung Display Co., Ltd.
- Applicants: Samsung Display Co., Ltd.
- Inventors: Sang Uk Lim; Wan-Soon Im; Sun Hwa Lee
- Web page: https://patentgrep.com/patent/US9753343B2

## CPC

- G02F 1/13624: {having more than one switching element per pixel}
- G02F 1/134309: {characterised by their geometrical arrangement}
- G02F 1/134345: {Subdivided pixels, e.g. for grey scale or redundancy}
- G02F 1/136213: {Storage capacitors associated with the pixel electrode}
- G02F 1/136286: {Wiring, e.g. gate line, drain line}
- 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

## Abstract

A display device includes a red pixel, a blue pixel, a green pixel, and a white pixel; a plurality of gate lines and data lines; and a plurality of storage electrode lines. Each of the red pixel, the blue pixel, and the green pixel includes two subpixel electrodes connected to a same gate line and a same data line and charged with different voltages. Every subpixel electrode included in the white pixel and connected to a same gate line and a same data line have a same voltage.

## Claims

### Claim 1

A display device comprising:
a red pixel, a blue pixel, a green pixel, and a white pixel;
a plurality of gate lines and data lines; and
a plurality of storage electrode lines,
wherein each of the red pixel, the blue pixel, and the green pixel comprises two subpixel electrodes connected to a same gate line and a same data line, and the two subpixel electrodes are charged with different voltages,
wherein every subpixel electrode included in the white pixel and connected to a same gate line and a same data line have a same voltage, and
wherein the white pixel comprises two subpixels including a first subpixel electrode disposed at an upper side of a gate line, and a second subpixel electrode disposed at a lower side of the gate line, and the first subpixel electrode and the second subpixel electrode are disposed facing each other with the gate line therebetween.

### Claim 2 (depends on 1)

The display device of claim 1, wherein each of the red pixel, the blue pixel, and the green pixel comprises:
a first thin film transistor and a second thin film transistor, wherein a control terminal and an input terminal of each of the first and second thin film transistors are respectively connected to the same gate line and the same data line;
a third thin film transistor, wherein a control terminal of the third thin film transistor is connected to the same gate line, an input terminal of the third thin film transistor is connected to an output terminal of the second thin film transistor, and an output terminal of the third thin film transistor is connected to one of the storage electrode lines;
a third subpixel electrode connected to an output terminal of the first thin film transistor; and
a fourth subpixel electrode connected to the output terminal of the second thin film transistor.

### Claim 3 (depends on 2)

The display device of claim 2, wherein the white pixel comprises:
a fourth thin film transistor, wherein a control terminal of the fourth thin film transistor is connected to the same gate line and an input terminal of the fourth thin film transistor is connected to the same data line,
wherein the first subpixel electrode and the second subpixel electrodes are connected to an output terminal of the fourth thin film transistor.

### Claim 4 (depends on 1)

The display device of claim 1, wherein a third subpixel electrode of each of the red pixel, the blue pixel, and the green pixel is disposed at an upper side of a gate line, and a fourth subpixel electrode of each of the red pixel, the blue pixel, and the green pixel is disposed at a lower side of the gate line.

### Claim 5 (depends on 1)

The display device of claim 1, wherein the second subpixel electrode of the white pixel is bigger than the first subpixel electrode of the white pixel.

### Claim 6 (depends on 1)

The display device of claim 1, wherein the first subpixel electrode and the second subpixel electrode of the white pixel are integrally formed.

### Claim 7 (depends on 1)

The display device of claim 1, wherein the red pixel, the blue pixel, the green pixel, and the white pixel are arranged in a direction in which the plurality of gate lines extend.