IP Library › Granted Patent US 12711888

Granted Patent B2

US 12711888 · App. 19/284,148 · Granted Aug 18, 2026

Display system

Inventors: Kazunari Tomizawa (Tokyo, JP); Kentaro Okuyama (Tokyo, JP); Junji Kobashi (Tokyo, JP)

Assignee: Japan Display Inc.

G09G3/2003 G09G3/18 G09G3/19 G09G2320/0276 G09G2320/0646 G09G2360/144

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Quick Facts

Patent No.: US 12711888
App. No.: 19/284,148
Granted: Aug 18, 2026
Kind: B2

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Abstract

According to an aspect, a display system includes: a display panel having a display area provided with pixels and configured to allow a user to visually recognize a background transmitted through the display area; a light source configured to emit light toward a side surface of the display panel; a signal processing circuit configured to generate input gradation values and output either first gradation values that are the input gradation values or second gradation values obtained by multiplying each of the input gradation values by an adjustment coefficient of 1 or smaller corresponding to attenuation of light propagating in the display panel; an illuminance sensor; and a camera. The signal processing circuit is configured to output the first gradation values when average luminance of the background image is a first predetermined value or larger and illuminance acquired by the illuminance sensor is a second predetermined value or larger.

Claims (43)

1 . A display system comprising:

a display panel that has a display area provided with a plurality of pixels arrayed in a first direction and a second direction intersecting the first direction and is configured to allow a user to visually recognize a background transmitted through the display area;

a light source configured to emit light in the second direction toward a side surface of the display panel extending in the first direction;

a signal processing circuit configured to

generate input gradation values corresponding to the pixels based on an image to be displayed and

output either first gradation values that are the input gradation values or second gradation values obtained by multiplying each of the input gradation values by an adjustment coefficient of 1 or smaller corresponding to attenuation of light propagating in the display panel;

an illuminance sensor configured to measure environmental illuminance; and

a camera configured to acquire a background image transmitted through the display panel, wherein

the signal processing circuit is configured to output the first gradation values when average luminance of the background image is equal to or larger than a first predetermined value and illuminance acquired by the illuminance sensor is equal to or larger than a second predetermined value, and

the signal processing circuit is configured to output the second gradation values when the average luminance of the background image is smaller than the first predetermined value and the illuminance is smaller than the second predetermined value.

2 . The display system according to claim 1 , wherein the display panel is a liquid crystal panel in which polymer-dispersed liquid crystal is sealed.

3 . The display system according to claim 1 , wherein

the signal processing circuit is configured to output the second gradation values when the average luminance of the background image is equal to or larger than the first predetermined value and the illuminance is smaller than the second predetermined value or when the average luminance of the background image is smaller than the first predetermined value and the illuminance is equal to or larger than the second predetermined value, and

the signal processing circuit is configured to set the adjustment coefficient based on brightness of the image to be displayed.

4 . The display system according to claim 3 , wherein the signal processing circuit is configured to monotonically increase the adjustment coefficient as the brightness of the image to be displayed decreases.

5 . The display system according to claim 1 , wherein

the signal processing circuit is configured to calculate, as a display image level, the minimum average value of pixel gradation values of respective colors included in the image to be displayed, and

6 . The display system according to claim 5 , wherein the signal processing circuit is configured to set the adjustment coefficient based on the display image level.

7 . The display system according to claim 6 , wherein the signal processing circuit is configured to monotonically increase the adjustment coefficient as the display image level decreases.

8 . The display system according to claim 1 , wherein the signal processing circuit is configured to output, based on an attribute of the image to be displayed, the first gradation values or the second gradation values when the average luminance of the background image is equal to or larger than the first predetermined value and the illuminance is smaller than the second predetermined value or when the average luminance of the background image is smaller than the first predetermined value and the illuminance is equal to or larger than the second predetermined value.

9 . The display system according to claim 8 , wherein the signal processing circuit is configured to set the adjustment coefficient based on the attribute of the image to be displayed.

10 . A display system comprising:

a display panel that has a display area provided with a plurality of pixels arrayed in a first direction and a second direction intersecting the first direction and is provided with an electrochromic layer configured to make a background of the display area invisible;

a light source configured to emit light in the second direction toward a side surface of the display panel extending in the first direction;

a signal processing circuit configured to

generate input gradation values corresponding to the pixels based on an image to be displayed and

an illuminance sensor configured to measure environmental illuminance, wherein

the signal processing circuit is configured to output the first gradation values when the background of the display area is made visible and illuminance acquired by the illuminance sensor is equal to or larger than a second predetermined value, and

the signal processing circuit outputs the second gradation values when the background of the display area is made invisible by the electrochromic layer and the illuminance is smaller than the second predetermined value.

11 . The display system according to claim 10 , wherein the display panel is a liquid crystal panel in which polymer-dispersed liquid crystal is sealed.

12 . The display system according to claim 10 , wherein

the signal processing circuit is configured to output the second gradation values when the background of the display area is made visible and the illuminance is smaller than the second predetermined value or when the background of the display area is made invisible by the electrochromic layer and the illuminance is equal to or larger than the second predetermined value, and

the signal processing circuit is configured to set the adjustment coefficient based on brightness of the image to be displayed.

13 . The display system according to claim 12 , wherein the signal processing circuit is configured to monotonically increase the adjustment coefficient as the brightness of the image to be displayed decreases.

14 . The display system according to claim 10 , wherein the signal processing circuit is configured to output the second gradation values when the background of the display area is made visible and the illuminance is smaller than the second predetermined value or when the background of the display area is made invisible by the electrochromic layer and the illuminance is equal to or larger than the second predetermined value and when the minimum average value of pixel gradation values of respective colors included in the image to be displayed is equal to or larger than a third predetermined value.

15 . The display system according to claim 14 , wherein the signal processing circuit is configured to

calculate, as a display image level, the minimum average value of the pixel gradation values of the respective colors included in the image to be displayed and

set the adjustment coefficient based on the display image level.

16 . The display system according to claim 15 , wherein the signal processing circuit is configured to monotonically increase the adjustment coefficient as the display image level decreases.

17 . The display system according to claim 10 , wherein the signal processing circuit is configured to output, based on an attribute of the image to be displayed, the first gradation values or the second gradation values when the background of the display area is made visible and the illuminance is smaller than the second predetermined value or when the background of the display area is made invisible by the electrochromic layer and the illuminance is equal to or larger than the second predetermined value.

18 . The display system according to claim 17 , wherein the signal processing circuit is configured to set the adjustment coefficient based on the attribute of the image to be displayed.