Driving device for display panel, display device including the driving device, method for driving a display panel, program, and storage medium

• US 7,916,159 B2
• Filed: 12/14/2005
• Issued: 03/29/2011
• Est. Priority Date: 12/27/2004
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Shiomi, Makoto
• Primary Examiner(s): Nguyen; Kevin M
• Application Number:
  US11/720,071
• Publication Number:
  US 20080079755A1
• Time in Patent Office: 1,931 Days
• Field of Search: 345/690, 345/694, 345/600
• US Class Current: 345/690
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607

Abstract

A display panel is the one in which a pixel composed of sub-pixels of red (R), green (G), blue (B), and at least one other color has two sub-pixels at least in a vertical scanning direction, and color filters are provided respectively corresponding to the sub-pixels. There are provided: an incoming signal interpolating section which interpolate each of pixels based on incoming color signal components of red (R), green (G), and blue (B) at least in a vertical scanning direction to generate interpolated RGB signals; a luminance signal converting section which converts color signals of interpolated sub-pixels, which are obtained from the incoming signal interpolating section, into luminance signals; an another color luminance component adding section which adds a luminance signal component of at least one other color on a basis of luminance signal components of colors of red (R), green (G), and blue (B), which components are outputted from the luminance signal converting section; and a luminance reallocating section which reallocates luminance signals of peripheral interpolated sub-pixels, for a color of each of the color filters corresponding to the sub-pixels, in accordance with output from the another color luminance component adding section.

Claims

1. A driving device for a display panel in which a pixel composed of sub-pixels of red (R), green (G), blue (B), and at least one other color has a plurality of sub-pixels at least in a vertical scanning direction, and color filters are provided corresponding to the respective sub-pixels, the driving device comprising:

an incoming signal interpolating section arranged to interpolate each of the sub-pixels based on incoming color signal components of red (R), green (G), and blue (B) at least in a vertical scanning direction to generate interpolated RGB signals;

a luminance signal converting section arranged to convert color signals of interpolated sub-pixels, which are obtained from the incoming signal interpolating section, into luminance signals;

a color luminance component adding section arranged to add a luminance signal component of at least one other color on a basis of luminance signal components of colors of red (R), green (G), and blue (B), which components are outputted from the luminance signal converting section; and

a luminance reallocating section which reallocates luminance signals of peripheral interpolated sub-pixels, for a color of each of the color filters corresponding to the sub-pixels, in accordance with output from the color luminance component adding section.

2. The driving device according to claim 1, wherein the luminance signal for the color of the interpolated sub-pixel varies depending upon luminance signals of adjacent interpolated sub-pixels of the same color, which sub-pixels exist on upper and lower sides and left and right sides.

3. The driving device according to claim 1, wherein the luminance reallocating section performs reallocation for a color luminance signal D of an interpolated sub-pixel (m,n) in m rows (m is positive integer of not less than 2) and in n columns (n is positive integer of not less than 2), in accordance with a color luminance signal D of an interpolated sub-pixel (m−

1,n), a color luminance signal D of an interpolated sub-pixel (m+1,n), a color luminance signal D of an interpolated sub-pixel (m,n−

1), and a color luminance signal D of an interpolated sub-pixel (m,n+1).

4. The driving device according to claim 1, wherein the color filters are provided respectively corresponding to even-numbered kinds of sub-pixels per pixel.

5. The driving device according to claim 2, wherein the color filters are provided respectively corresponding to a plurality of sub-pixels which are arranged in a matrix pattern of 2-by-2 sub-pixels per pixel.

6. The driving device according to claim 5, wherein the color filters are provided respectively corresponding to the sub-pixels of red (R), green (G), blue (B), and white (W).

7. The driving device according to claim 5, wherein the color filters are provided respectively corresponding to the sub-pixels of red (R), green (G), blue (B), and yellow (Y).

8. The driving device according to claim 5, wherein the color filters are provided respectively corresponding to the sub-pixels of red (R), green (G), blue (B), and cyan (CN).

9. The driving device according to claim 4, wherein the color filters are provided respectively corresponding to a plurality of the sub-pixels which are arranged in a matrix pattern of 2-by-3 sub-pixels of red (R), green (G), blue (B), white (W), yellow (Y), blue (B), and cyan (CN).

10. The driving device according to claim 4, wherein the color filters are provided respectively corresponding to four pixels arranged in a matrix pattern of 2-by-2 pixels per block.

11. The driving device according to claim 4, wherein the color filters are arranged such that the four pixels per block are combinations of (a) a pixel including sub-pixels of red (R), blue (B), green (G), and white (W) in this order counterclockwise and (b) a pixel composed of sub-pixels of blue (B), red (R), white (W), and green (G) in this order counterclockwise.

12. The driving device according to claim 1, wherein the incoming signal interpolating section interpolates the sub-pixels twofold at least in a vertical scanning direction.

13. The driving device according to claim 12, wherein the incoming signal interpolating section performs twofold interpolation by a linear interpolation method, a convolution interpolation method, a cosine transformation method, a method using Fourier transformation, a method using Laplacian transformation, or any combination of these methods.

21. A computer-readable storage medium storing a display panel driving program for operating the driving device for a display panel according to claim 1, the program causing a computer to function as the incoming signal interpolating section, the luminance signal converting section, the color luminance component adding section, and the luminance reallocating section.

22. A driving device for a display panel, wherein the driving device receives pixel data containing multicolor information obtained by executing the display panel driving program stored on the computer-readable storage medium according to claim 21, and outputs the pixel data to a corresponding display panel.

14. A display device including a driving device for a display panel in which a pixel including sub-pixels of red (R), green (G), blue (B), and at least one other color has a plurality of sub-pixels at least in a vertical scanning direction, and color filters are provided corresponding to the respective sub-pixels, the driving device comprising:

an incoming signal interpolating section arranged to interpolate each of sub-pixels based on incoming color signal components of red (R), green (G), and blue (B) at least in a vertical scanning direction to generate interpolated RGB signals;

a luminance signal converting section which converts color signals of interpolated sub-pixels, which are obtained from the incoming signal interpolating section, into luminance signals;

a color luminance component adding section arranged to add a luminance signal component of at least one other color on a basis of luminance signal components of colors of red (R), green (G), and blue (B), which components are outputted from the luminance signal converting section; and

a luminance reallocating section which reallocates luminance signals of peripheral interpolated sub-pixels, for a color of each of the color filters corresponding to the sub-pixels, in accordance with output from the color luminance component adding section.

15. The display device according to claim 14, wherein in the driving device for a display panel, the luminance signal for the color of the interpolated sub-pixel varies depending upon luminance signals of adjacent interpolated sub-pixels of the same color, which sub-pixels exist on upper and lower sides and left and right sides.

16. The display device according to claim 15, wherein the luminance reallocating section of the driving device for a display panel performs reallocation for a color luminance signal D of an interpolated sub-pixel (m,n) in m rows (m is positive integer of not less than 2) and in n columns (n is positive integer of not less than 2), in accordance with a color luminance signal D of an interpolated sub-pixel (m−

1,n), a color luminance signal D of an interpolated sub-pixel (m+1,n), a color luminance signal D of an interpolated sub-pixel (m,n−

1), and a color luminance signal D of an interpolated sub-pixel (m,n+1).

17. The display device according to claim 14, wherein the display device has a liquid crystal display element as a display element.

18. A method for driving a display panel in which a pixel including sub-pixels of red (R), green (G), blue (B), and at least one other color has a plurality of sub-pixels at least in a vertical scanning direction, and color filters are provided corresponding to the respective sub-pixels, the method comprising:

interpolating each of the sub-pixels based on incoming color signal components of red (R), green (G), and blue (B) at least in a vertical scanning direction to generate interpolated RGB signals;

converting color signals of interpolated sub-pixels, which are obtained in the interpolating step, into luminance signals;

adding a luminance signal component of at least one other color on a basis of luminance signal components of colors of red (R), green (G), and blue (B), which are obtained as the luminance signals in the converting step; and

reallocating luminance signals of peripheral interpolated sub-pixels for a color of each of the color filters corresponding to the sub-pixels, after the adding step.

19. The method according to claim 18, wherein the luminance signal for the color of the interpolated sub-pixel varies depending upon luminance signals of adjacent interpolated sub-pixels of the same color, which sub-pixels exist on upper and lower sides and left and right sides.

20. The method according to claim 18, wherein the reallocating step includes a step of performing reallocation for a color luminance signal D of an interpolated sub-pixel (m,n) in m rows (m is positive integer of not less than 2) and in n columns (n is positive integer of not less than 2), in accordance with a color luminance signal D of an interpolated sub-pixel (m−

1,n), a color luminance signal D of an interpolated sub-pixel (m+1,n), a color luminance signal D of an interpolated sub-pixel (m,n−

1), and a color luminance signal D of an interpolated sub-pixel (m,n+1).