Image display device and image display method

Patent metadata

Field	Value
Publication number	US-9001145-B2
Application number	US-201113576664-A
Country	US
Kind code	B2
Filing date	Feb 22, 2011
Priority date	Feb 26, 2010
Publication date	Apr 7, 2015
Grant date	Apr 7, 2015

Abstract

An image display device has pixels each of which includes sub-pixels of four or more colors, and displays a high-definition image that has been subjected to sub-pixel-level filtering processing. The image display device includes a display panel in which color filters of sub-pixel colors including three principal colors of red, green, and blue as well as at least one color other than the three principal colors are arranged regularly; and an image processor that performs filtering processing with respect to an input image signal. The image processor includes: a principal color conversion section that generates sub-pixel signals corresponding to the sub-pixel colors, respectively, from the input image signals Rin, Bin, and Gin of the three principal colors; and a sub-pixel enhancement section that gives, to the sub-pixel signals, position information in accordance with an order of arrangement of the color filters of the sub-pixel colors in the display panel, and performs the filtering processing sub-pixel by sub-pixel.

First claim

The invention claimed is:

1. An image display device comprising:
a display section in which color filters of sub-pixel colors including three principal colors of red, green, and blue as well as at least one color other than the three principal colors are arranged regularly; and
an image processor configured to perform filtering processing with respect to an input image signal,
wherein the image processor includes:
a principal color conversion section configured to generate sub-pixel signals corresponding to the sub-pixel colors, respectively, from the input image signals of the three principal colors; and
a sub-pixel processing section configured to give, to the sub-pixel signals, position information in accordance with an order of arrangement of the color filters of the sub-pixel colors in the display section, and perform the filtering processing sub-pixel by sub-pixel, and

the sub-pixel processing section includes:
a high-pass filter portion configured to perform high-frequency component enhancement processing; and
a monochromatic component extractor configured to extract a minimum value among those of a plurality of sub-pixel signals belonging to one pixel as a monochromatic component, and output the extracted monochromatic component to the high-pass filter portion.

2. The image display device according to claim 1 ,
wherein the color filters of the sub-pixel colors in the display section have uniform sizes, and
a filter coefficient in the filtering processing in the sub-pixel processing section has a value at an evenly sampled point of a filter function.

3. The image display device according to claim 1 ,
wherein the color filters of the sub-pixel colors in the display section have non-uniform sizes, and
a filter coefficient in the filtering processing in the sub-pixel processing section has a value at an unevenly sampled point of a filter function.

4. The image display device according to claim 1 , wherein the sub-pixel colors other than the three primary colors include at least one color selected from yellow; cyan; magenta; white; red having a chroma different from that of the red as the primary color; green having a chroma different from that of the green as the primary color; and blue having a chroma different from that of the blue as the primary color.

5. An image display device comprising:
a display section in which color filters of sub-pixel colors including three principal colors of red, green, and blue as well as at least one color other than the three principal colors are arranged regularly; and
an image processor configured to perform filtering processing with respect to an input image signal,
wherein the image processor includes:
a principal color conversion section configured to generate sub-pixel signals corresponding to the sub-pixel colors, respectively, from the input image signals of the three principal colors; and
a sub-pixel processing section configured to give, to the sub-pixel signals, position information in accordance with an order of arrangement of the color filters of the sub-pixel colors in the display section, and perform the filtering processing sub-pixel by sub-pixel,

the sub-pixel processing section includes a low-pass filter configured to perform smoothing processing; and
the sub-pixel processing section further includes a monochromatic component extractor configured to extract a minimum value among those of a plurality of sub-pixel signals belonging to one pixel as a monochromatic component, and output the extracted monochromatic component to the low-pass filter.

6. The image display device according to claim 5 ,
wherein the color filters of the sub-pixel colors in the display section have uniform sizes, and
a filter coefficient in the filtering processing in the sub-pixel processing section has a value at an evenly sampled point of a filter function.

7. The image display device according to claim 5 ,
wherein the color filters of the sub-pixel colors in the display section have non-uniform sizes, and
a filter coefficient in the filtering processing in the sub-pixel processing section has a value at an unevenly sampled point of a filter function.

8. The image display device according to claim 5 ,
wherein the sub-pixel colors other than the three primary colors include at least one color selected from yellow; cyan; magenta; white; red having a chroma different from that of the red as the primary color; green having a chroma different from that of the green as the primary color; and blue having a chroma different from that of the blue as the primary color.

9. An image display device comprising:
a display section in which color filters of sub-pixel colors including three principal colors of red, green, and blue as well as at least one color other than the three principal colors are arranged regularly; and
an image processor configured to perform filtering processing with respect to an input image signal,
wherein the image processor includes:
a principal color conversion section configured to generate sub-pixel signals corresponding to the sub-pixel colors, respectively, from the input image signals of the three principal colors; and
a sub-pixel processing section configured to give, to the sub-pixel signals, position information in accordance with an order of arrangement of the color filters of the sub-pixel colors in the display section, and perform the filtering processing sub-pixel by sub-pixel,

the sub-pixel processing section includes:
a low-pass filter configured to perform smoothing processing; and
a pixel enhancement section configured to perform high-frequency component enhancement processing pixel by pixel, with respect to the input image signal of the three principal colors, and

the pixel enhancement section includes:
a color space conversion part configured to divide the input image signal of the three principal colors into a brightness signal and a color-difference signal;
a high-pass filter part configured to perform high-frequency component enhancement processing with respect to the brightness signal;
a delay unit configured to delay the color-difference signal; and
a color space reverse conversion part configured to receive an output from the high-pass filter part and an output from the delay unit, and convert the same into the same form as that of the input image signal of the three principal colors.

10. The image display device according to claim 9 ,
wherein the color filters of the sub-pixel colors in the display section have uniform sizes, and
a filter coefficient in the filtering processing in the sub-pixel processing section has a value at an evenly sampled point of a filter function.

11. The image display device according to claim 9 ,
wherein the color filters of the sub-pixel colors in the display section have non-uniform sizes, and
a filter coefficient in the filtering processing in the sub-pixel processing section has a value at an unevenly sampled point of a filter function.

12. The image display device according to claim 9 ,
wherein the sub-pixel colors other than the three primary colors include at least one color selected from yellow; cyan; magenta; white; red having a chroma different from that of the red as the primary color; green having a chroma different from that of the green as the primary color; and blue having a chroma different from that of the blue as the primary color.

13. An image displaying method executable by an image processing circuit for displaying an image on a display device in which color filters of sub-pixel colors including three principal colors of red, green, and blue as well as at least one color other t

Assignees

• Yoshiyama Kazuyoshi
• Furukawa Hiroyuki
• Kondoh Naoko
• Nakagawa Shinji
• Sharp Kk

Inventors

• Yoshiyama Kazuyoshi
• Furukawa Hiroyuki
• Kondoh Naoko
• Nakagawa Shinji

Classifications

• H04N1/4092

  Edge or detail enhancement · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G09G2300/023

  Display panel composed of stacked panels · CPC title

• G09G3/2074

  using sub-pixels · CPC title

• G09G2300/0452

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