# US 10,768,469 B2 · Active matrix display device

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- Number: US 10,768,469 B2
- Document ID: US10768469B2
- Status: Granted
- Kind: B2
- Application number: 15/959,446
- Filed: 2018-04-23
- Published: 2018-11-01
- Granted: 2020-09-08
- Earliest claimed: 2017-04-28
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Tatsuya Yata; Kazunari Tomizawa
- Web page: https://patentgrep.com/patent/US10768469B2

## CPC

- G02F 1/133514: {Colour filters}
- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/133528: {Polarisers}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/1343: Electrodes {(reflective electrodes G02F1/133553)}
- G02F 1/134309: {characterised by their geometrical arrangement}
- G02F 1/134345: {Subdivided pixels, e.g. for grey scale or redundancy}
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- 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
- 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)

## Abstract

According to an aspect, a display device includes a pixel including: a first sub-pixel including a first color filter transmitting light having a spectrum peak falling on a spectrum of reddish green; a second sub-pixel including a second color filter transmitting light having a spectrum peak falling on a spectrum of bluish green; a third sub-pixel including a third color filter transmitting light having a spectrum peak falling on a spectrum of red; and a fourth sub-pixel including a fourth color filter transmitting light having a spectrum peak falling on a spectrum of blue. The first, second, third, and fourth sub-pixels each include a reflective electrode reflecting light transmitted through the color filter. Each of the third and fourth sub-pixels is greater in size than the first and second sub-pixels. The first sub-pixel with the second sub-pixel has a size equal to or greater than that of the third sub-pixel.

## Claims

### Claim 1

A display device comprising:
a pixel including four sub-pixels, the four sub-pixels including:
a first sub-pixel including a first color filter that transmits light having a spectrum peak falling on a spectrum of reddish green;
a second sub-pixel including a second color filter that transmits light having a spectrum peak falling on a spectrum of bluish green;
a third sub-pixel including a third color filter that transmits light having a spectrum peak falling on a spectrum of red; and
a fourth sub-pixel including a fourth color filter that transmits light having a spectrum peak falling on a spectrum of blue, wherein
the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel each include a reflective electrode that reflects light transmitted through the corresponding color filter,
a side of the first sub-pixel is directly adjacent to a side of the second sub-pixel,
each of the third sub-pixel and the fourth sub-pixel is greater in size than the first sub-pixel and the second sub-pixel, and
the first sub-pixel added to the second sub-pixel has a size equal to or greater than a size of the third sub-pixel.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel added to the second sub-pixel has the size equal to or greater than a size of the fourth sub-pixel.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the fourth sub-pixel is greater in size than the third sub-pixel.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel in combination reproduce yellow.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein the first sub-pixel and the second sub-pixel in combination reproduce green.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein
the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel are each divided into a plurality of sub-divided pixels having different areas, and
N-bit gradation expression is performed through a combination of whether each of the sub-divided pixels transmits light, where N is a natural number of 2 or greater.

### Claim 7 (depends on 6)

The display device according to claim 6, wherein each of the sub-divided pixels comprises:
a first substrate provided with the reflective electrode;
a second substrate provided with the color filter and a translucent electrode; and
a liquid crystal layer disposed between the reflective electrode and the translucent electrode,
wherein each of the sub-divided pixels included in the sub-pixels has a holder that holds a potential variable according to the gradation expression.

### Claim 8

A display device comprising:
a pixel including four sub-pixels, the four sub-pixels including:
a first sub-pixel including a first color filter that transmits light having a spectrum peak falling on a spectrum of reddish green;
a second sub-pixel including a second color filter that transmits light having a spectrum peak falling on a spectrum of bluish green;
a third sub-pixel including a third color filter that transmits light having a spectrum peak falling on a spectrum of red; and
a fourth sub-pixel including a fourth color filter that transmits light having a spectrum peak falling on a spectrum of blue, wherein
the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel each include a reflective electrode that reflects light transmitted through the corresponding color filter,
a side of the first sub-pixel is directly adjacent to a side of the second sub-pixel,
each of the third sub-pixel and the fourth sub-pixel is greater in size than the first sub-pixel and the second sub-pixel, and
the first sub-pixel added to the second sub-pixel has a size equal to or greater than a size of the third sub-pixel and has a size equal to or greater than a size of the fourth sub-pixel.