Display device and luminance correction method of the same

Patent metadata

Field	Value
Publication number	US-10026350-B2
Application number	US-201615172044-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Oct 22, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A display device according to an exemplary embodiment of the present invention includes: a display unit configured to display a specific image according to first data supplied from the outside; an image compensator configured to receive a photographed image in which the specific image is photographed and generate variation information corresponding to luminance variations of pixels using the photographed image; an image corrector configured to generate second data by correcting the first data according to the variation information; and a data driver configured to generate a data signal using the first data or the second data and supply the data signal to the display unit.

First claim

What is claimed is:

1. A display device comprising:
a display unit configured to display a specific image according to first data supplied from the outside;
an image compensator configured to receive a photographed image in which the specific image is photographed and to generate variation information corresponding to luminance variations of pixels using the photographed image;
an image corrector configured to generate second data by correcting the first data according to the variation information; and
a data driver configured to generate data signals using the first data or the second data and to supply the data signals to the display unit,
wherein the image compensator comprises:
a first image compensator configured to generate a first compensated image by compensating for a lens luminance variation associated with a characteristic of a lens for photographing the photographed image;
a second image compensator configured to generate a second compensated image by compensating for a voltage drop variation of the data signal in the photographed image; and
a third image compensator configured to generate the variation information by applying a gray level values of the specific image.

2. The display device of claim 1 , wherein the photographed image comprises:
a black and white image.

3. The display device of claim 1 ,
wherein the data signals comprising a same gray level are provided to the pixels in the display unit when the specific image is displayed.

4. The display device of claim 1 ,
wherein the first image compensator is configured to adjust luminance of at least one of a first region, which comprises a center part of the display unit, and a second region, which comprises an edge part of the display unit.

5. The display device of claim 4 ,
wherein the first image compensator is configured to compensate for the lens luminance variation by increasing luminance of the second region.

6. The display device of claim 4 ,
wherein the first image compensator is configured to generate the first compensated image, with the lens luminance variation compensated, from the photographed image using the following equation:
P comp1 =−[√{square root over ( r 1 2 −( n x −L ))}+√{square root over ( r 1 2 −( n y −L ))}]+2 r 1

where the P comp1 represents a first luminance value generated by compensating a luminance value of each of the pixels for displaying the photographed image, the r 1 represents a radius of a hemisphere of a first mask, n x represents x-axis positions of the pixels arranged along a first direction in the display unit, n y represents y-axis positions of the pixels arranged along a second direction perpendicular to the first direction in the display unit, and L represents a total number of pixels, and
wherein the first mask comprises the radius of the hemisphere that corresponds to a distribution of a first luminance parameter to be applied to the luminance value of each of the pixels.

7. The display device of claim 1 ,
wherein the second image compensator is configured to compensate for the voltage drop variation by adjusting luminance of the pixels close to the data driver.

8. The display device of claim 7 ,
wherein the second image compensator is configured to compensate for the voltage drop variation by decreasing the luminance of the pixels close to the data driver.

9. The display device of claim 7 ,
wherein the second image compensator is configured to generate the second compensated image with the voltage drop variation compensated using the following equation:
P comp2 =−[√{square root over ( r 2 2 −( n x −L ))}+√{square root over ( r 2 2 −( n y −L ))}]+2 r 2

where the P comp2 represents a second luminance value generated by compensating a luminance value of each of the pixels for displaying the photographed image, the r 2 represents a radius of a hemisphere of a second mask, n x represents x-axis positions of the pixels arranged along a first direction in the display unit, n y represents y-axis positions of the pixels arranged along a second direction perpendicular to the first direction in the display unit, and L represents a total number of pixels, and
wherein the second mask comprises the radius of the hemisphere formed by a distribution of a second luminance parameter to be applied to the luminance value of each of the pixels.

10. The display device of claim 1 ,
wherein the third image compensator is configured to apply a luminance compensation ratio to a second luminance value of the second compensated image according to the gray level values of the specific image.

11. The display device of claim 10 ,
wherein the third image compensator is configured to calculate the luminance compensation ratio using the following equation:
weight=1−[(1− Pm )×( I .Gray)/255]

where the weight is the luminance compensation ratio, the Pm is a luminance parameter of the second luminance value calculated by dividing a minimum luminance value by a reference luminance value, and I.Gray is a gray level value of the specific image.

12. The display device of claim 11 ,
wherein the third image compensator is configured to generate the variation information comprising a third luminance value using the following equation:
O.P =weight× I.P

where the O.P comprises the third luminance value of each of the pixels, and the I.P comprises the second luminance value.

13. A luminance correction method of a display device comprising:
displaying a specific image according to first data supplied from the outside;
receiving a photographed image in which the specific image is photographed;
generating variation information according to a luminance variation of the photographed image; and
generating second data by compensating the first data according to the variation information,
wherein the generating the variation information comprises:
compensating for a lens luminance variation associated with a characteristic of a lens of a photographing device for photographing the photographed image;
compensating for a voltage drop variation of a data signal comprised in the photographed image; and
generating the variation information by applying a gray level value of the specific image.

14. The method of claim 13 , wherein the compensating for the lens luminance variation comprises:
adjusting luminance of at least one of a center part of the photographed image, which comprises a first region, and a second region other than the first region.

15. The method of claim 13 , wherein the compensating for the voltage drop variation comprises:
adjusting luminance of a part of the photographed image adjacent to a data driver for supplying the data signal.

Assignees

• Samsung Display Co Ltd

Inventors

• Jun Byung Geun
• Kim Min Cheol
• Kim In Hwan
• Cha Ui Yeong

Classifications

• G09G3/3258

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G3/3677

  suitable for active matrices only · CPC title

• G09G2360/145

  the light originating from the display screen · CPC title