Image display device and method of displaying image

• US 9,646,528 B2
• Filed: 07/22/2015
• Issued: 05/09/2017
• Est. Priority Date: 07/22/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Nakanishi, Takayuki, Yata, Tatsuya
• Primary Examiner(s): ZALALEE, SULTANA MARCIA
• Application Number:
  US14/805,699
• Publication Number:
  US 20160027366A1
• Time in Patent Office: 657 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 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/062 Adjustment of illumination source parameters
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2340/06 Colour space transformation
• 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 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607

Abstract

An image display device includes an image display unit including first pixels including sub-pixels of three or more colors in a first color gamut, and second pixels including sub-pixels of three or more colors in a second color gamut different from the first color gamut; a processing unit that determines an output of the sub-pixels of the first pixel based on a combined component of a first component and an out-of-color gamut component, and determines an output of the sub-pixels of the second pixel based on a third component by eliminating the out-of-color gamut component from a second component; and a determination unit that determines whether the input image signal corresponds to an edge of an image. When the input image signal corresponds to the edge of the image, the processing unit causes the out-of-color gamut component not to be reflected in an output of the first pixel.

Claims

1. An image display device comprising:

an image display unit including first pixels each constituted of sub-pixels of three or more colors included in a first color gamut, and second pixels each constituted of sub-pixels of three or more colors in a second color gamut different from the first color gamut, at least one color of the colors of the sub-pixels included in the second pixels is different from the colors of the sub-pixels in each of the first pixels, the first pixels and the second pixels being arranged in a matrix, and the first pixels and the second pixels being adjacent to each other;

a processing unit that determines an output of the sub-pixels included in the first pixel based on a combined component of a first component as components of an input image signal corresponding to the first pixel and an out-of-color gamut component as a component of an input image signal corresponding to the adjacent second pixel, a color of the out-of-color gamut component is not extendable with the sub-pixels included in the second pixel, and determines an output of the sub-pixels included in the second pixel based on a third component obtained by eliminating the out-of-color gamut component from a second component as components of the input image signal corresponding to the second pixel; and

a determination unit that determines whether the input image signal corresponding to the second pixel is an input image signal corresponding to an edge of an image based on a comparison result between the first component and the second component, wherein,

when the input image signal corresponding to the second pixel is the input image signal corresponding to the edge of the image, the processing unit causes the out-of-color gamut component not to be reflected in an output of a sub-pixel of the first pixel that is not adjacent to a sub-pixel of the second pixel in which light is output.

2. The image display device according to claim 1, wherein the processing unit causes the out-of-color gamut component to be reflected in an output of a sub-pixel of a color including the out-of-color gamut component among the sub-pixels included in the second pixel.

3. The image display device according to claim 2, wherein the processing unit allows only saturation to be lowered while maintaining a hue and luminance among the hue, the saturation, and the luminance of a color indicated by the input image signal corresponding to the second pixel, and determines an output of the sub-pixels included in the second pixel.

4. The image display device according to claim 1, wherein

the first pixels and the second pixels are arranged in a staggered manner,

the processing unit determines, when each of the first pixels and each of the second pixels are assumed to be one group of pixels and the input image signal corresponding to the second pixel is not the input image signal corresponding to the edge of the image, an output of the sub-pixels included in the first pixel based on a combined component of the first component and the out-of-color gamut component corresponding to the second pixel included in the group of pixels among components of an input image signal corresponding to the group of pixels, and determines an output of the sub-pixels included in the second pixel in the group of pixels based on the third component corresponding to the group of pixels obtained by eliminating the out-of-color gamut component from the second component among the components of the input image signal corresponding to the group of pixels, and

when the input image signal corresponding to the second pixel included in the group of pixels is the input image signal corresponding to the edge of the image, the processing unit uses the out-of-color gamut component corresponding to the second pixel to determine an output of a sub-pixel adjacent to a sub-pixel of the second pixel in which light is output among the sub-pixels included in the first pixel in another group adjacent to the second pixel.

5. The image display device according to claim 4, wherein, when the input image signal corresponding to the second pixel included in the group of pixels is the input image signal corresponding to the edge of the image, the processing unit determines an output of the sub-pixels included in the first pixel within a range in which saturation and luminance are not reversed between the second pixel and the first pixel in which the out-of-color gamut component of the second pixel is reflected, and rotation of the hue is not caused, the rotation being caused when a color that most strongly determines the hue in a case in which the out-of-color gamut component is not reflected in the first pixel is different from a color that most strongly determines the hue in a case in which the out-of-color gamut component is reflected in the first pixel.

6. The image display device according to claim 1, wherein the determination unit determines whether the input image signal corresponding to the second pixel is the input image signal corresponding to the edge of the image based on a difference in at least one of a hue, luminance, and saturation between the first component and the second component.

7. The image display device according to claim 1, wherein the processing unit does not cause the out-of-color gamut component to be reflected in an output of the sub-pixels included in the first pixel and the second pixel.

8. The image display device according to claim 1, wherein three colors among the colors of the sub-pixels included in the second pixel are complementary colors of three colors among the colors of the sub-pixels included in the first pixel.

9. The image display device according to claim 1, wherein three colors among the colors of the sub-pixels included in the first pixel correspond to red, green, and blue.

10. The image display device according to claim 1, wherein

the first pixel and the second pixel each include a white sub-pixel, and

an arrangement of the white sub-pixel in the first pixel is same as an arrangement of the white sub-pixel in the second pixel.

11. A method of displaying an image for determining an output of sub-pixels included in each pixel of an image display unit in which first pixels each constituted of sub-pixels of three or more colors included in a first color gamut and second pixels each constituted of sub-pixels of three or more colors included in a second color gamut different from the first color gamut are arranged in a matrix and the first pixels are adjacent to the second pixels, the method comprising:

determining whether an input image signal corresponding to the second pixel is an input image signal corresponding to an edge of an image based on a comparison result between a first component as components of an input image signal corresponding to the first pixel and a second component as components of the input image signal corresponding to the second pixel, and

in a case in which the input image signal corresponding to the second pixel is the input image signal corresponding to the edge of the image, causing an out-of-color gamut component not to be reflected in an output of a sub-pixel of the first pixel that is not adjacent to a sub-pixel of the second pixel in which light is output, when determining an output of the sub-pixels included in the first pixel based on a combined component of the first component as components of the input image signal corresponding to the first pixel and the out-of-color gamut component as a component of the input image signal corresponding to the adjacent second pixel, a color of which is not extendable with the sub-pixels included in the second pixel, and determining an output of the sub-pixels included in the second pixel based on a third component obtained by eliminating the out-of-color gamut component from the second component as components of the input image signal corresponding to the second pixel.