Display device

Patent metadata

Field	Value
Publication number	US-2020363678-A1
Application number	US-202016985284-A
Country	US
Kind code	A1
Filing date	Aug 5, 2020
Priority date	Apr 28, 2017
Publication date	Nov 19, 2020
Grant date	—

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 failing 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 plurality of pixels each consisting of 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
each of a size of the third color filter and a size of the fourth color filter is greater than a size of the first color filter and a size of the second color filter, and a combined size of the size of the first color filter and the size of the second color filter is equal to or greater than the size of the third color filter.

2 . The display device according to claim 1 , wherein the combined size of the size of the first color filter and the size of the second color filter is equal to or greater than the size of the fourth color filter.

3 . The display device according to claim 1 , wherein the size of the fourth color filter s greater than the size of the third color filter.

4 . 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 each include a reflective electrode that reflects light transmitted through the corresponding color filter.

5 . The display device according to claim 4 , wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel in combination reproduce yellow.

6 . The display device according to claim 4 , wherein the first sub-pixel and the second sub-pixel in combination reproduce green.

7 . The display device according to claim 1 , wherein a side of the first color filter in the first sub-pixel is directly adjacent to a side of the second color filter in the second sub-pixel.

8 . The display device according to claim 4 , 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.

9 . The display device according to claim 8 , wherein each of the sub-divided pixels comprises:
a first substrate provided with the reflective electrodes; a second substrate provided with the color filters 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.

10 . A color filter substrate for a display device comprising:
a plurality of pixel areas each including four sub-pixel areas, the four sub-pixel areas including:
a first sub-pixel area in which a first color filter is disposed, the first color filter transmitting light having a spectrum peak falling on a spectrum of reddish green;
a second sub-pixel area in which a second color filter is disposed, the second color filter transmitting light having a spectrum peak falling on a spectrum of bluish green;
a third sub-pixel area in which a third color filter is disposed, the third color filter transmitting light having a spectrum peak falling on a spectrum of red; and
a fourth sub-pixel area in which a fourth color filter is disposed, the fourth color filter transmitting light having a spectrum peak falling on a spectrum of blue,
wherein, in a plan view, the first color filter is in contact with the second color filter, each of the third sub-pixel area and the fourth sub-pixel area is greater in size than the first sub-pixel area and the second sub-pixel area, and a combined area of the first sub-pixel area and the second sub-pixel area is equal to or greater than the third sub-pixel area.

11 . The color filter substrate for a display device according to claim 10 , wherein the combined area of the first sub-pixel area and the second sub-pixel area is equal to or greater than the fourth sub-pixel area.

12 . The color filter substrate for a display device according to claim 10 , wherein the fourth sub-pixel area is greater than the third sub-pixel area.

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