Display device

Patent metadata

Field	Value
Publication number	US-10636370-B2
Application number	US-201816215001-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Dec 12, 2017
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

According to an aspect, a display device includes: a display unit including a plurality of pixels; and an image processor configured to generate an image signal for displaying an image on the display unit. When the image processor causes the display unit to display the image such that a first pixel region that displays a first color is adjacent to a second pixel region that displays a second color and that has luminance higher than luminance of the first color, the image processor applies gain to an image signal corresponding to a pixel in the second pixel region to make brightness of the second pixel region lower than brightness of the first pixel region.

First claim

What is claimed is:

1. A display device comprising:
a display unit including a plurality of pixels, the pixels including
a first sub-pixel including a first color filter configured to transmit light having a spectrum peak falling on a spectrum of reddish green,
a second sub-pixel including a second color filter configured to transmit light having a spectrum peak falling on a spectrum of bluish green,
a third sub-pixel including a third color filter configured to transmit light having a spectrum peak falling on a spectrum of red, and
a fourth sub-pixel including a fourth color filter configured to transmit light having a spectrum peak falling on a spectrum of blue; and

an image processor configured to generate an image signal for displaying an image on the display unit,
wherein,
when the image processor causes the display unit to display the image such that a first pixel region that displays a first-region color is adjacent to a second pixel region that displays a second-region color and that has luminance higher than luminance of the first-region color, the image processor applies gain to an image signal corresponding to a pixel in the second pixel region to make brightness of the second pixel region lower than brightness of the first pixel region, and
when the first-region color is yellow reproduced through a combination of the first sub-pixel and the third sub-pixel, the image processor adds the second sub-pixel to the combination in reproducing the first-region color in the first pixel region.

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

3. The display device according to claim 1 , further comprising:
a detector configured to detect brightness of external light, wherein
the image processor determines a gain factor to be applied to the image signal corresponding to the pixel in the second pixel region based on the brightness of the external light.

4. The display device according to claim 1 , wherein the second-region color is white.

5. 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 of the pixel each include a reflective electrode configured to reflect light transmitted through the corresponding color filter.

6. The display device according to claim 1 , wherein, when the first pixel region is surrounded by the second pixel region, the image processor applies gain to the image signal corresponding to the pixel in the second pixel region.

7. The display device according to claim 1 , wherein, when the first pixel region adjacent to the second pixel region is equal in size to or smaller in size than the second pixel region, the image processor applies gain to the image signal corresponding to the pixel in the second pixel region.

8. A display device comprising:
a display unit including a plurality of pixels;
an image processor configured to generate an image signal for displaying an image on the display unit and
a detector configured to detect brightness of external light,
wherein,
when the image processor causes the display unit to display the image such that a first pixel region that displays a first-region color is adjacent to a second pixel region that displays a second-region color and that has luminance higher than luminance of the first-region color, the image processor applies gain to an image signal corresponding to a pixel in the second pixel region to make brightness of the second pixel region lower than brightness of the first pixel region,
the image processor determines a gain factor to be applied to the image signal corresponding to the pixel in the second pixel region based on the brightness of the external light, and
when the brightness of the external light is equal to or higher than a predetermined level, the image processor applies gain to the image signal corresponding to the pixel belonging to the second pixel region such that the brightness of the second pixel region is lower than the brightness of the first pixel region.

9. The display device according to claim 8 , wherein the first-region color is yellow and the second-region color is white.

10. The display device according to claim 8 , wherein, when the first pixel region is surrounded by the second pixel region, the image processor applies gain to the image signal corresponding to the pixel in the second pixel region.

11. The display device according to claim 8 , wherein, when the first pixel region adjacent to the second pixel region is equal in size to or smaller in size than the second pixel region, the image processor applies gain to the image signal corresponding to the pixel in the second pixel region.

Assignees

• Japan Display Inc

Inventors

• Yata Tatsuya
• Tomizawa Kazunari

Classifications

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G2360/144

  the light being ambient light · CPC title

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• G02F2201/52

  RGB geometrical arrangements · CPC title