Pixel layout and display with varying area and/or luminance capability of same type sub-pixels in different composite pixels

Patent metadata

Field	Value
Publication number	US-9947257-B2
Application number	US-201514808228-A
Country	US
Kind code	B2
Filing date	Jul 24, 2015
Priority date	Jul 24, 2015
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A color display includes multiple composite pixels, each composite pixel including sub-pixels of more than one color type. Sub-pixels of at least one of the color types are provided with differing luminance capability in different composite pixels. Each composite pixel may include red, green and blue sub-pixels having different luminance capability in different composite pixels. The differing luminance capability may be achieved by providing sub-pixels of at least one of the color types of differing relative area. An image data processing unit (IDPU) receives input image data of a standard format, and modifies the input image data into output image data for display to account for a discrepancy between the luminance capability based on the differing luminance capability or differing size of each sub-pixel, and a luminance capability as expected based on the input image data. The IDPU then outputs the output image data to control the composite pixels.

First claim

The invention claimed is:

1. A color display comprising:
a plurality of composite pixels, each composite pixel comprising sub-pixels of more than one color type;
wherein sub-pixels of at least one of the color types are provided with differing luminance capability in different composite pixels; and
further comprising an image data processing unit (IDPU), and the IDPU is configured to:
receive input image data of a standard format;
modify the input image data into output image data to account for a discrepancy between the luminance capability of each sub-pixel and a luminance capability for each sub-pixel as expected based on the input image data; and
output the output image data to control the plurality of the composite pixels;
wherein the IDPU is configured to modify the input image data by:
processing groups of pixels in the input image data corresponding to the smallest repeating unit of the pixel pattern of the display together;
matching the pattern pixel luminances in the group specified by the input image data to the closest of a set of zero effective resolution loss patterns; and
transferring luminance between sub-pixels to account for the luminance discrepancy in a manner informed by the result of the pattern matching.

2. A color display comprising:
a plurality of composite pixels, each composite pixel comprising sub-pixels of more than one color type;
wherein sub-pixels of at least one of the color types are provided with differing luminance capability in different composite pixels; and
further comprising an image data processing unit (IDPU), and the IDPU is configured to:
receive input image data of a standard format;
modify the input image data into output image data to account for a discrepancy between the luminance capability of each sub-pixel and a luminance capability for each sub-pixel as expected based on the input image data; and
output the output image data to control the plurality of the composite pixels;
wherein the IDPU is configured to modify the input image data by:
processing sub-pixels individually and in sequence;
transferring excess luminance from lower luminance sub-pixel types to their immediate neighbour larger luminance sub-pixel types which are yet to be processed in the sequence, in a manner which accounts for both the discrepancy in the luminance capability of each sub-pixel, and in relative luminance capability of the sub-pixels between which luminance is transferred.

3. A color display comprising:
a plurality of composite pixels, each composite pixel comprising sub-pixels of more than one color type;
wherein sub-pixels of at least one of the color types are provided with differing luminance capability in different composite pixels;
wherein the differing luminance capability is achieved by providing sub-pixels of at least one of the color types of differing relative area in different composite pixels; and
further comprising an image data processing unit (IDPU), and the IDPU is configured to:
receive input image data of a standard format;
modify the input image data into output image data to account for a discrepancy between the luminance capability based on the differing size of each sub-pixel and a luminance capability for each sub-pixel as expected based on the input image data; and
output the output image data to control the plurality of the composite pixels;
wherein the IDPU is configured to modify the input image data by:
processing groups of pixels in the input image data corresponding to the smallest repeating unit of the pixel pattern of the display together;
matching the pattern pixel luminances in the group specified by the image data to the closest of a set of zero effective resolution loss patterns; and
transferring luminance between sub-pixels to account for the luminance discrepancy based on the differing size in each sub-pixel in a manner informed by the result of the pattern matching.

4. A color display comprising:
a plurality of composite pixels, each composite pixel comprising sub-pixels of more than one color type;
wherein sub-pixels of at least one of the color types are provided with differing luminance capability in different composite pixels;
wherein the differing luminance capability is achieved by providing sub-pixels of at least one of the color types of differing relative area in different composite pixels; and
further comprising an image data processing unit (IDPU), and the IDPU is configured to:
receive input image data of a standard format;
modify the input image data into output image data to account for a discrepancy between the luminance capability based on the differing size of each sub-pixel and a luminance capability for each sub-pixel as expected based on the input image data; and
output the output image data to control the plurality of the composite pixels;
wherein the IDPU is configured to modify the input image data by:
processing sub-pixels individually and in sequence; and
transferring excess luminance from smaller area sub-pixel types to their immediate neighbour larger area sub-pixel types which are yet to be processed in the sequence, in a manner which accounts for both the discrepancy in the luminance capability based on the relative size of each sub-pixel, and in a relative size of the sub-pixels between which luminance is transferred.

Assignees

• Sharp Kk

Inventors

• Broughton Benjamin John
• Smith Nathan James
• Heywood-Lonsdale Edward

Classifications

• G09G3/3607

  for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127) · CPC title

• G09G2340/0457

  Improvement of perceived resolution by subpixel rendering · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title