DISPLAY DEVICE AND DISPLAY METHOD

• US 20140043357A1
• Filed: 04/04/2012
• Published: 02/13/2014
• Est. Priority Date: 04/08/2011
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yamato, Asahi, Inada, Ken, Nakano, Taketoshi, Yanagi, Toshihiro
• Application Number:
  US14/009,598
• Publication Number:
  US 20140043357A1
• Time in Patent Office: Days
• US Class Current: 345/603
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0633 by amplitude modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/3607 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 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

The display device (100) including a display panel (20) including pixels (21) each of which includes a red (R) sub pixel (22), a green (G) sub pixel (23), a blue (B) sub pixel (24), and white (W)sub pixel (25), the display device (100) includes an RGB data obtaining section (110) for obtaining RGB data; and a first calculating section (1 12a) for setting luminance of a white (W) sub pixel of one pixel (21) of the pixels (21) to be substantially identical with luminance of white sub pixels of some pixels (21) of the pixels (21) in the case where the RGB data obtained by the obtaining section (100) is converted into RGBX data for each pixel.

Claims

1. A display device, which includes a display panel including pixels each of which includes a red (R) sub pixel, a green (G) sub pixel, a blue (B) sub pixel, and a fourth sub pixel (X), the display device comprising

obtaining means for obtaining RGB data;

and

first converting means for setting luminance of a fourth sub pixel (X) of one pixel of the pixels to be substantially identical with luminance of fourth sub pixels (X) of some pixels of the pixels in the case where the RGB data obtained by the obtaining means is converted into RGBX data for each pixel, the one pixel and the some pixels being located in a predetermined region.

2. The display device as set forth in claim 1,

wherein the first converting means converts the RGB data into RGBX data so that the fourth sub pixels (X) of the pixels are caused to display black.

3. The display device as set forth in claim 1 or 2, further comprising:

second converting means for independently determining the luminance of the fourth sub pixel (X) of the one pixel and the luminance of the fourth sub pixels (X) of the some pixels in the case where the RGB data obtained by the obtaining means is converted into the RGBX data for each pixel; and

display controlling means for carrying out a dimming process when a display mode is switched between a first display mode and a second display mode, the first display mode being a display mode in which the RGBX data converted by the first converting means is displayed, the second display mode being a display mode in which the RGBX data converted by the second converting means is displayed.

4. The display device as set forth in claim 1 or 2, further comprising:

second converting means for independently determining the luminance of the fourth sub pixel (X) of the one pixel and the luminance of the fourth sub pixels (X) of the some pixels in the case where the RGB data obtained by the obtaining means is converted into the RGBX data for each pixel; and

display controlling means for simultaneously displaying a first display mode and a second display mode in the same screen, the first display mode being a display mode in which the RGBX data converted by the first converting means is displayed, the second display mode being a display mode in which the RGBX data converted by the second converting means is displayed.

5. The display device as set forth in claim 1,

wherein the fourth sub pixels (X) of the pixels are white (W).

6. The display device as set forth in claim 5,

wherein, in the each pixel, the red (R) and green (G) sub pixels are larger in area than the blue (B) sub pixel.

7. The display device as set forth in claim 1,

wherein the fourth sub pixels (X) of the pixels are yellow (Y).

8. The display device as set forth in claim 7,

wherein, in each pixel, the blue (B) sub pixel are larger in area than the red (R) and green (G) sub pixels.

9. The display device as set forth in claim 1,

wherein the fourth sub pixels (X) of the pixels are green (G).

10. The display device as set forth in claim 3,

wherein the display device comprises the display controlling means for automatically switching between display in the first display mode and display in the second display mode in accordance with a data characteristic of the RGB data.

11. The display device as set forth in claim 10, wherein

the data characteristic is chromaticness of the RGB data;

and

whether display should be performed in the first display mode or the second display mode is determined in accordance with a degree of the chromaticness.

12. The display device as set forth in claim 1,

wherein the display device is a liquid crystal display device.

13. The display device as set forth in claim 12, wherein:

the display device includes a plurality of light sources of a backlight; and

backlight control is performed for each group of the plurality of light sources, the each group being located in each predetermined region.

14. The display device as set forth in claim 3,

wherein a time required for the dimming process is 30 ms to 2 s.

15. A display method with use of a display device which includes a display panel including pixels each of which includes a red (R) sub pixel, a green (G) sub pixel, a blue (B) sub pixel, and a fourth sub pixel (X), the method comprising the steps of:

obtaining RGB data; and

setting luminance of a fourth sub pixel (X) of one pixel of the pixels to be substantially identical with luminance of fourth sub pixels (X) of some pixels of the pixels in the case where the RGB data obtained by the obtaining means is converted into RGBX data for each pixel, the one pixel and the some pixels being located in a predetermined region.