DISPLAY UNIT, IMAGE PROCESSING UNIT, AND DISPLAY METHOD

• US 20130335457A1
• Filed: 05/21/2013
• Published: 12/19/2013
• 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, ASANO, MITSUYASU, ARAKI, SHOJI, SHIMIZU, HIDEHISA, NAKAGAWA, MAKOTO, INOUE, YASUO
• Granted Patent: US 9,940,870 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• 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. A display unit, comprising:

a gain calculating section obtaining, based on first luminance information for each pixel, a first gain, the first gain being 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 the pixel luminance value being derived from the first luminance information;

a determination section determining, based on the first luminance information and the first gain, second luminance information for each of the pixels; and

a display section performing display based on the second luminance information.

2. The display unit according to claim 1, wherein

the gain calculating section obtains the first gain based on a gain function that represents a relationship between the pixel luminance value and the first gain, and

the first gain 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.

3. The display unit according to claim 1, wherein the predetermined luminance value is configured to increase with an increase in average of the first luminance information in a frame image.

4. The display unit according to claim 1, wherein the pixel luminance value corresponds to a value of Value information in an HSV color space.

5. The display unit according to claim 1, wherein

the display section includes a plurality of display pixels, and

each of the display pixels includes a first sub-pixel, a second sub-pixel, a third sub-pixel, and a fourth sub-pixel, the first sub-pixel, the second sub-pixel, and the third sub-pixel being associated with respective wavelengths that are different from one another, and the fourth sub-pixel emitting color light that is different from color light emitted by each of the first sub-pixel, the second sub-pixel, and the third sub-pixel.

6. The display unit according to claim 5, wherein the first luminance information contains three pieces of first sub luminance information, the respective three pieces of first sub luminance information corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel.

7. The display unit according to claim 5, further comprising a conversion section,

wherein the second luminance information contains three pieces of second sub luminance information, the respective three pieces of second sub luminance information corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel,

wherein the conversion section generates, based on the second luminance information, third luminance information that contains four pieces of third sub luminance information, the respective four pieces of third sub luminance information corresponding to the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub-pixel, and

wherein the display section performs display based on the third luminance information.

8. The display unit according to claim 7, wherein the conversion section performs color gamut conversion based on the second luminance information, and generates the third luminance information based on the second luminance information that is subjected to the color gamut conversion.

9. The display unit according to claim 7, further comprising a correction section,

wherein the correction section obtains, based on the respective three pieces of third sub luminance information corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel among the four pieces of third sub luminance information contained in the third luminance information, second gains for the respective three pieces of third sub luminance information,

wherein the correction section generates, based on the three pieces of third sub luminance information and the corresponding second gains, fourth luminance information that contains three pieces of fourth sub luminance information and the third sub luminance information, the respective three pieces of fourth sub luminance information corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel, and the third sub luminance information corresponding to the fourth sub pixel, and

wherein the display section performs display based on the fourth luminance information.

10. The display unit according to claim 9, wherein each of the second gains is configured to decrease with an increase in luminance level in a range where the luminance level is equal to or larger than a predetermined value, the luminance level being represented by the corresponding one of the pieces of third sub luminance information.

11. The display unit according to claim 7, further comprising a correction section,

wherein the correction section obtains, based on a largest luminance level among the respective three pieces of third sub luminance information corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel among the four pieces of third sub luminance information contained in the third luminance information, a second gain for each pixel,

wherein the correction section generates, based on the four pieces of third sub luminance information and the second gain, fourth luminance information that contains four pieces of fourth sub luminance information, the respective four pieces of fourth sub luminance information corresponding to the first sub-pixel, the second sub-pixel, the third sub-pixel, and the fourth sub pixel, and

wherein the display section performs display based on the fourth luminance information.

12. The display unit according to claim 1, wherein the gain calculating section acquires Saturation information in an HSV color space from the first luminance information, and corrects the first gain to be reduced with an increase in the Saturation information.

13. The display unit according to claim 1, wherein the gain calculating section corrects the first gain to be reduced with an increase in average of the first luminance information in a frame image.

14. The display unit according to claim 5, wherein

the first sub-pixel, the second sub-pixel, and the third sub-pixel emit red color light, green color light, and blue color light, respectively, and

the color light emitted by the fourth sub-pixel has a luminosity factor that is substantially equal to or higher than a luminosity factor for the green color light emitted by the second sub-pixel.

15. The display unit according to claim 14, wherein the fourth sub-pixel emits white color light.

16. An image processing unit, comprising:

a gain calculating section obtaining, based on first luminance information for each pixel, a first gain, the first gain being 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 the pixel luminance value being 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.

17. A display method, comprising:

obtaining, based on first luminance information for each pixel, a first gain, the first gain increasing 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 the pixel luminance value being derived from the first luminance information;

determining, based on the first luminance information and the first gain, second luminance information for each of the pixels; and

performing display based on the second luminance information.