IMAGE DISPLAY DEVICE, ELECTRONIC APPARATUS, AND PIXEL LOCATION DETERMINING METHOD

• US 20070103491A1
• Filed: 10/02/2006
• Published: 05/10/2007
• Est. Priority Date: 10/13/2005
• Status: Active Grant

• Current Assignee: 138 East LCD Advancements Limited (Vector Capital Corporation)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: ARAGAKI, Takumi, MORIYA, Hidekuni
• Granted Patent: US 7,889,216 B2
• Time in Patent Office: Days
• US Class Current: 345/694
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• 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 2340/0421 Horizontal resolution change
• 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

An image display device displays an image by using a plurality of display pixels, each display pixel including four sub-pixels corresponding to different colors. The four sub-pixels forming each of the display pixels are located such that two sub-pixels having a smaller level of luminance are located at edges of the display pixel, each of the two sub-pixels being located at either edge of the display pixel, and such that two other sub-pixels are located at a central portion of the display pixel so that an absolute value of a difference between a luminance added value, which is a value obtained by adding luminance levels of one of the sub-pixels located at the edges of the display pixel and an adjacent pixel, and a luminance added value, which is a value obtained by adding luminance levels of the other sub-pixel located at the edge of the display pixel and an adjacent pixel, is reduced.

Claims

1. An image display device, comprising:

a plurality of display pixels that display an image, each display pixel including four sub-pixels that provide different colors;

the four sub-pixels including two edge sub-pixels disposed at opposite lateral edges of the display pixel and two interior sub-pixels disposed laterally between the two edge sub-pixels, such that the two edge sub-pixels have a smaller level of luminance, and an absolute value of a difference between a luminance added value, which is a value obtained by adding luminance levels of one of the two edge sub-pixels and an adjacent pixel, and a luminance added value, which is a value obtained by adding luminance levels of the other edge sub-pixel and an adjacent pixel, is reduced.

2. The image display device according to claim 1, the luminance and the luminance added value being defined in a luminance and opponent-color space.

3. The image display device according to claim 2, the luminance and the luminance added value being defined based on a visual space characteristic in the luminance and opponent-color space.

4. The image display device according to claim 1, the four sub-pixels including red, green, blue, and cyan, the red sub-pixel being disposed adjacent the cyan sub-pixel, the green sub-pixel being disposed adjacent the red sub-pixel, and the blue sub-pixel being disposed adjacent the green sub-pixel.

5. The image display device according to claim 1, the four sub-pixels including red, green, blue, and white, the white sub-pixel being disposed adjacent the blue sub-pixel, the green sub-pixel being disposed adjacent the white sub-pixel, and the red sub-pixel being disposed adjacent the green sub-pixel.

6. The image display device according to claim 1, the four sub-pixels including red, yellowish green, emerald green, and blue, the yellowish green sub-pixel being disposed adjacent the blue sub-pixel, the red sub-pixel being disposed adjacent the yellowish green sub-pixel, and the emerald green sub-pixel being disposed adjacent the red sub-pixel.

7. The image display device according to claim 1, color regions of the four sub-pixels including, within a visible light region where hue changes according to a wavelength, a bluish hue color region, a reddish hue color region, and two hue color regions including hues ranging from blue to yellow.

8. The image display device according to claim 1, color regions of the four sub-pixels including a color region where a peak of a wavelength of light passing through the color region ranges from 415 to 500 nm, a color region where a peak of a wavelength of light passing through the color region is at least 600 nm, a color region where a peak of a wavelength of light passing through the color region ranges from 485 to 535 nm, and a color region where a peak of a wavelength of light passing through the color region ranges from 500 to 590 nm.

9. The image display device according to claim 1, the plurality of display pixels being located linearly such that an identical color extends vertically through the image display device.

10. The image display device according to claim 1, the plurality of display pixels being located such that the sub-pixels corresponding to vertically adjacent display pixels are displaced from each other by at least one sub-pixel.

11. The image display device according to claim 1, the sub-pixels of each display pixel being sized such that a horizontal width of each sub-pixel being substantially one fourth a horizontal width of the display pixel.

12. The image display device according to claim 1, further comprising a color filter covering the sub-pixels.

18. An electronic apparatus, comprising:

the image display device set forth in claim 1;

and

a power supply that supplies a voltage to the image display device.

13. An image display device, comprising:

a plurality of display pixels that display an image, each display pixel including at least four sub-pixels that provide different colors, the at least four sub-pixels defining an average level of luminance;

the at least four sub-pixels including two edge sub-pixels disposed at opposite lateral edges of the display pixel, the two edge sub-pixels having a level of luminance smaller than the average level of luminance of the at least four sub-pixels.

14. The image display device according to claim 13, each display pixel including a center sub-pixel disposed between the two edge sub-pixels, the center sub-pixel having a luminance level that is larger than a luminance level of the other sub-pixels.

15. The image display device according to claim 13, the two edge sub-pixels having a smaller luminance level.

16. The image display device according to claim 13, each of the sub-pixels being located such that luminance is decreased from a center toward the edges of the display pixel.

17. The image display device according to claim 13, an absolute value of a difference between a luminance added value, which is a value obtained by adding luminance levels of a plurality of sub-pixels located at one side with respect to a center of the display pixel, and a luminance added value, which is a value obtained by adding luminance levels of a plurality of sub-pixels located at the other side with respect to the center of the display pixel, is reduced.

19. A method for determining locations of sub-pixels of a display device that includes multiple display pixels, each display pixel including four of the sub-pixels, that provide different colors, the method comprising:

determining locations of two edge sub-pixels of the four sub-pixels at opposite lateral edges of the display pixel, the two edge sub-pixels having a smaller luminance level; and

determining locations of two central sub-pixels disposed between the two edge sub-pixels, such that an absolute value of a difference between a luminance added value, which is a value obtained by adding luminance levels of one of the two edge sub-pixels and an adjacent pixel, and a luminance added value, which is a value obtained by adding luminance levels of the other edge sub-pixel pixel and an adjacent pixel, is reduced.

20. A method of manufacturing a display that includes multiple display pixels, each of the display pixels including four sub-pixels, the method comprising:

disposing two edge sub-pixels of the four sub-pixels at opposite lateral edges of each display pixel; and

disposing two interior sub-pixels of the four sub-pixels laterally between the two edge sub-pixels, such that the two edge sub-pixels have a smaller level of luminance, and an absolute value of a difference between a luminance added value, which is a value obtained by adding luminance levels of one of the two edge sub-pixels and an adjacent pixel, and a luminance added value, which is a value obtained by adding luminance levels of the other edge sub-pixel and an adjacent pixel, is reduced.