Image processing device, image processing method, and image display device

Patent metadata

Field	Value
Publication number	US-9799256-B2
Application number	US-201514919316-A
Country	US
Kind code	B2
Filing date	Oct 21, 2015
Priority date	Oct 22, 2014
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

An image processing device includes a light detection unit and an image conversion unit. The light detection unit is configured to detect a first grayscale value of a background image. The background image is an image seen by a user through an at least partially transparent display panel. The image conversion unit is configured to generate a correction image having a second grayscale value obtained by subtracting a third grayscale value pertaining to the first grayscale value from a fourth grayscale value of an input image inputted to the at least partially transparent display panel. The input image is an image intended to be displayed on the at least partially transparent display panel.

First claim

What is claimed is:

1. An image processing device comprising:
an optical measurement device configured to measure light of a background image seen by a user through an at least partially transparent display panel and to generate a signal therefrom; and
a display control circuit configured to output a correction image to the transparent display panel to display the correction image through the transparent display panel,
wherein the display control circuit comprises:
a light detection circuit connected to the optical measurement device, configured to receive the signal, and configured to detect a first grayscale value therefrom; and
an image conversion circuit connected to the light detection circuit and configured to generate the correction image having a second grayscale value obtained by subtracting a third grayscale value pertaining to the first grayscale value from a fourth grayscale value of an input image inputted to the transparent display panel.

2. The device of claim 1 , wherein the transparent display panel comprises an organic light emitting device.

3. The device of claim 1 , wherein the image conversion circuit adjusts the second grayscale value to a minimum value when the fourth grayscale value is smaller than the first grayscale value.

4. The device of claim 1 , wherein the image conversion circuit increases the third grayscale value when the fourth grayscale value increases from a minimum value to the first grayscale value.

5. The device of claim 4 , wherein the image conversion circuit decreases the third grayscale value when the fourth grayscale value increases from the first grayscale value toward a maximum value.

6. The device of claim 1 , wherein the image conversion circuit increases the third grayscale value when the fourth grayscale value increases from a minimum value to a fifth grayscale value higher than the first grayscale value.

7. The device of claim 6 , wherein the image conversion circuit decreases the third grayscale value when the fourth grayscale value increases from the fifth grayscale value toward a maximum value.

8. An image processing method comprising:
measuring a value of light of a background image using an optical measurement device, wherein the background image is an image seen by a user through an at least partially transparent display panel, and generating a signal therefrom;
detecting a first grayscale value from the signal generated by the optical measurement device using a light detection circuit;
generating a correction image having a second grayscale value obtained by subtracting a third grayscale value pertaining to the first grayscale value from a fourth grayscale value of an input image inputted to the at least partially transparent display panel, using an image conversion circuit; and
displaying the correction image on the at least partially transparent display panel.

9. A display device comprising:
an at least partially transparent display panel for displaying an input image;
a light detection unit configured to detect a first grayscale value of a background image, wherein the background image is an image disposed behind and through the at least partially transparent display panel; and
an image conversion unit configured to generate a correction image having a second grayscale value obtained by subtracting a third grayscale value pertaining to the first grayscale value from a fourth grayscale value of the input image inputted to the at least partially transparent display panel, and to output the generated correction image to the at least partially transparent display panel,
wherein the input image is an image intended to be displayed on the at least partially transparent display panel.

10. The device of claim 9 , wherein the at least partially transparent display panel comprises an organic light emitting device.

11. A display device comprising:
an at least partially transparent display panel for displaying an intended image; and
a display control unit for generating a correction image to the at least transparent display panel, wherein the display control unit comprises:
an optical measurement device for measuring information corresponding to a background image, wherein the background image is an image seen by a user through the at least partially transparent display panel;
a light detection unit for obtaining a first grayscale value based on the information output from the optical measurement device; and
an image conversion unit configured to generate the correction image having a second grayscale value obtained by subtracting a third grayscale value pertaining to the first grayscale value from a fourth grayscale value of the intended image,
wherein the second grayscale changes in a first slope with respect to the fourth grayscale value when the fourth grayscale value is less than a reference value, wherein the second grayscale changes in a second slope with respect to the fourth grayscale value when the fourth grayscale value is greater than the reference value, and wherein the second slope is higher than the first slope.

12. The display device of claim 11 , wherein the at least partially transparent display panel includes an organic light emitting device.

13. The display device of claim 11 , wherein the first slope is zero when the fourth grayscale value is less than the reference value.

14. The display device of claim 11 , wherein the reference value is equal to or greater than the first grayscale value.

15. The display device of claim 11 , a maximum value of the second grayscale value and a maximum value of the fourth grayscale value are the same as each other.

Assignees

• Samsung Display Co Ltd
• Samsung Display Co Ltd

Inventors

• Yoshiyama Masahiko
• Ohishi Hiroshi
• Yasuoka Takashi

Classifications

• G09G2320/0271

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

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G2320/0238

  Improving the black level · CPC title

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title