Display unit, image processing device, display method, and electronic apparatus for controlling luminance

• US 10,497,304 B2
• Filed: 12/13/2013
• Issued: 12/03/2019
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yano, Tomoya, Funatsu, Yohei, Inoue, Yasuo
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): English, Alecia D
• Application Number:
  US14/106,484
• Publication Number:
  US 20140176620A1
• Time in Patent Office: 2,181 Days
• Field of Search: None
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

An image processing device includes a control section configured to determine, based on first luminance information for each display pixel, frame luminance information in a single frame and current information. The current information indicates a magnitude of a current that is expected to be consumed in displaying the single frame on a display section. The control section is configured to control, based on the frame luminance information and the current information, light-emitting luminance of the display section.

Claims

1. A display apparatus, comprising:

an electro-luminescence display including a plurality of light-emitting pixels, wherein each pixel of the plurality of light-emitting pixels comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel; and

circuitry configured to;

generate output image data based on an image processing on input image data of an image;

determine a gain value based on a first luminance information value and current information, wherein

the first luminance information value is a portion of the input image data corresponding to a specific pixel of the plurality of light-emitting pixels, and

the current information indicates a magnitude of current that is consumed for display of the output image data;

determine a second luminance information value based on the first luminance information value and the gain value, wherein the second luminance information value is a portion of the output image data corresponding to the specific pixel of the plurality of light-emitting pixels; and

increase the gain value based on;

a decrease of an area of an image object in the image, wherein the specific pixel belongs to the area of the image object; and

an increase of the first luminance information value relative to an average value of the input image data, wherein

the average value of the input image data corresponds to a specific region of the image, and

the specific region is larger than the area of the image object.

2. The display apparatus according to claim 1, wherein the first luminance information value is based on red luminance information, green luminance information, and blue luminance information.

3. The display apparatus according to claim 1, wherein the green sub-pixel is adjacent to the blue sub-pixel.

4. The display apparatus according to claim 1, wherein

the circuitry is further configured to increase the gain value based on an increase in a pixel luminance value in a range where the pixel luminance value is at least equal to a threshold pixel luminance value, and

the pixel luminance value is derived from the first luminance information value.

5. The display apparatus according to claim 4, wherein the circuitry is further configured to:

determine the gain value based on a gain function that represents a relationship between the pixel luminance value and the gain value; and

increase the gain value at a specific gradient based on the increase in the pixel luminance value, in the gain function.

6. The display apparatus according to claim 4, wherein the circuitry is configured to increase the threshold pixel luminance value based on an increase in an average of the first luminance information value in a frame image.

7. The display apparatus according to claim 4, wherein the pixel luminance value corresponds to a value of Value information in an HSV color space.

8. The display apparatus according to claim 1, wherein the second luminance information value includes a red luminance value corresponding to the red sub-pixel, a green luminance value corresponding to the green sub-pixel, a blue luminance value corresponding to the blue sub-pixel, and a white luminance value corresponding to the white sub-pixel.

9. The display apparatus according to claim 8, wherein the circuitry is further configured to determine at least one of the red luminance value, the green luminance value, or the blue luminance value based on the gain value.

10. The display apparatus according to claim 8, wherein the circuitry is further configured to determine the white luminance value based on the gain value.

11. The display apparatus according to claim 8, wherein the circuitry is further configured to determine each of the red luminance value, the green luminance value, the blue luminance value, and the white luminance value based on the gain value.

12. The display apparatus according to claim 1, wherein

the second luminance information value comprises four pieces of second sub luminance information value, and

each of the four pieces of the second sub luminance information value corresponds to respective one of the red sub-pixel, the green sub-pixel, the blue sub-pixel, or the white sub-pixel.

13. The display apparatus according to claim 12, wherein the circuitry is further configured to execute color gamut conversion based on the second luminance information value.

14. The display apparatus according to claim 1, wherein the circuitry is further configured to:

acquire saturation information in an HSV color space from the first luminance information value; and

correct the gain value that reduces based on an increase in the saturation information.

15. The display apparatus according to claim 1, wherein the circuitry is further configured to correct the gain value that reduces based an increase in an average of the first luminance information value in a frame image.

16. The display apparatus according to claim 1, wherein a first luminosity factor of color light emitted by the white sub-pixel is at least equal to a second luminosity factor for the green sub-pixel.

17. The display apparatus according to claim 1, wherein the white sub-pixel is adjacent to the blue sub-pixel.

18. The display apparatus according to claim 1, wherein the circuitry is further configured to increase the gain value as a color indicated by the first luminance information value of each of the red sub-pixel, the green sub-pixel, and the blue sub-pixel is closer to white.

19. An image processing apparatus, comprising:

a display panel including a plurality of pixels, wherein each pixel of the plurality of pixels comprises a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel; and

circuitry configured to;

generate display image data based on an image processing on input image data of an image;

determine a gain value based on a first luminance information value and current information, wherein

the first luminance information value is a portion of the input data image corresponding to a specific pixel of the plurality of pixels, and

the current information indicates a magnitude of a current that is consumed for display of the display image data;

generate a second luminance information value based on the first luminance information value and the gain value, wherein the second luminance information value is a portion of the display image data corresponding to the specific pixel; and

increase the gain value based on;

a decrease of an area of an image object in the image, wherein the specific pixel belongs to the area of the image object; and

an increase of the first luminance information value relative to an average value of the input image data, wherein

the average value of the input image data corresponds to a specific region of the image, and

the specific region is larger than the area of the image object.