Active matrix display device

Patent metadata

Field	Value
Publication number	US-10768469-B2
Application number	US-201815959446-A
Country	US
Kind code	B2
Filing date	Apr 23, 2018
Priority date	Apr 28, 2017
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

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.

First claim

What is claimed is:

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.

2. 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.

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

4. 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.

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

6. 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.

7. 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.

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.

Assignees

• Japan Display Inc

Inventors

• Yata Tatsuya
• Tomizawa Kazunari

Classifications

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02F1/133514 Primary

  Colour filters · CPC title

• G02F1/134345

  Subdivided pixels, e.g. for grey scale or redundancy · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title