DISPLAY UNIT, IMAGE PROCESSING UNIT, AND DISPLAY METHOD FOR IMPROVING IMAGE QUALITY

• US 20190325817A1
• Filed: 07/03/2019
• Published: 10/24/2019
• Est. Priority Date: 06/14/2012
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Yano, Tomoya, Nakagawa, Makoto, Asano, Mitsuyasu, Inoue, Yasuo, Araki, Shoji, Shimizu, Hidehisa
• Granted Patent: US 11,056,050 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 2360/147 the originated light output being determined for each pixel
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

An image processing unit includes: a gain calculating section obtaining, based on first luminance information for each pixel, a first gain, in which the first gain is configured to increase with an increase in pixel luminance value in a range where the pixel luminance value is equal to or larger than a predetermined luminance value, and in which the pixel luminance value is derived from the first luminance information; and a determination section determining, based on the first luminance information and the first gain, second luminance information for each of the pixels.

Claims

1-17. -17. (canceled)

18. A display apparatus, comprising:

a display panel including a plurality of self-luminescent pixels and configured to display an output image data; and

image processing circuitry configured to;

receive an input image data,

calculate a gain value based on an average luminance level contained in respective frames of the input image data and a value acquired from a first luminance information value of a specific one of the plurality of self-luminescent pixels, and

generate the output image data based on the gain value and the value acquired from the first luminance information value of the specific one of the plurality of self-luminescent pixels.

19. The display apparatus according to claim 18, wherein respective ones of the plurality of self-luminescent pixels include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel.

20. The display apparatus according to claim 19, wherein a color light emitted by the white sub-pixel has a luminosity factor that is substantially equal to or higher than a luminosity factor of a color light emitted by the green sub-pixel.

21. The display apparatus according to claim 19, wherein the image processing circuitry is configured to compare the first luminance information value of each of the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel with a predetermined luminance level, and to correct the first luminance information of each of the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel based on a comparison result and the gain value.

22. The display apparatus according to claim 18, wherein the image processing circuitry is configured to set the gain value based on the value acquired from the first luminance information value of the specific one of the plurality of self-luminescent pixels and the average luminance level in a case wherein an area of the image object is smaller than an area of a background image.

23. The display apparatus according to claim 18, wherein the image processing circuitry is configured to set the gain value based on the first luminance information value of the specific one of the plurality of self-luminescent pixels so as to prevent pieces of the luminance information from exceeding a predetermined luminance level.

24. The display apparatus according to claim 18, wherein

the image processing circuitry is configured to obtain the gain value, the gain value being configured to increase with an increase in a pixel luminance value in a range within which the pixel luminance value is equal to or larger than a predetermined luminance value, and

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

25. The display apparatus according to claim 24, wherein

the image processing circuitry is configured to obtain the gain value based on a gain function that represents a relationship between the pixel luminance value and the gain value, and

the gain value is configured to increase at a predetermined gradient with the increase in the pixel luminance value that is equal to or larger than the predetermined luminance value, in the gain function.

26. The display apparatus according to claim 24, wherein the predetermined luminance value is configured to increase with an increase in an average of the first luminance information value in a frame image.

27. The display apparatus according to claim 24, wherein the pixel luminance value corresponds to a value of Value information in an HSV color space.

28. The display apparatus according to claim 24, wherein the information processing circuitry is configured to acquire Saturation information in an HSV color space from the first luminance information value, and to correct the gain value so as to be reduced with an increase in the Saturation information.

29. The display apparatus according to claim 24, wherein the information processing circuitry is configured to correct the gain value so as to be reduced with an increase in an average of the first luminance information value in a frame image.

30. The display apparatus according to claim 18, wherein the image processing circuitry is configured to determine, based on the first luminance information value and the gain value, a second luminance information value.

31. The display apparatus according to claim 30, wherein the second luminance information value includes a red luminance value corresponding to a red sub-pixel of the plurality of self-luminescent pixels, a green luminance value corresponding to a green sub-pixel of the plurality of self-luminescent pixels, a blue luminance value corresponding to a blue sub-pixel of the plurality of self-luminescent pixels, and a white luminance value corresponding to a white sub-pixel of the plurality of self-luminescent pixels.

32. The display apparatus according to claim 31, wherein the image processing circuitry is 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.

33. The display apparatus according to claim 31, wherein the image processing circuitry is configured to determine the white luminance value based on the gain value.

34. The display apparatus according to claim 31, wherein the image processing circuitry is 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.

35. The display apparatus according to claim 31, wherein

the second luminance information value contains four pieces of sub-luminance information, respective ones of the four pieces of sub-luminance information corresponding to the red sub-pixel, the green sub-pixel, the blue sub-pixel, and the white sub-pixel, and

the image processing circuitry is configured to generate an output based on the second luminance information value.

36. The display apparatus according to claim 18, wherein the image processing circuitry is configured to perform a color gamut conversion based on the second luminance information value.

37. The display apparatus according to claim 18, wherein the image processing circuitry is configured to set the gain value based on an area of a first image object and an area of a second image object, in a case where the area of the first image object is larger than the area of the second image object.