Display apparatus, display method, display controller, letter image creating device, and computer-readable recording medium in which letter image generation program is recorded

• US 20020060689A1
• Filed: 07/20/2001
• Published: 05/23/2002
• Est. Priority Date: 09/20/2000
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Suzuki, Shoji, Iwata, Satoshi, Usui, Nobuaki
• Granted Patent: US 7,012,619 B2
• Time in Patent Office: Days
• US Class Current: 345/612
• 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 2340/0457 Improvement of perceived resolution by subpixel rendering
• 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 5/28 for enhancement of character form, e.g. smoothing

Abstract

A display apparatus includes a display section having plural display elements for displaying a display object with N (natural number larger than one) display elements per pixel, and a display control section, communicably connected to the display section, for controlling the displaying state of the display section in terms of color factors of the respective display elements in such a manner that the display object is displayed with each of the display elements corresponding to one or more pixels on the display object. It is possible to display a small letter, serving high visibility.

Claims

1. A display apparatus comprising:

a display section, having a plurality of display elements for displaying a display object with N (N is a natural number larger than one) display elements per pixel; and

a display control section, communicably connected to said display section, for controlling the displaying state of said display section in terms of color factors of the respective display elements in such a manner that the display object is displayed with each of said display elements corresponding to one or more pixels of the display object.

2. A display apparatus according to claim 1, wherein:

each of said display elements are rectangular;

said N display elements are successively arranged in a predetermined direction perpendicular to the longitudinal center line of the individual rectangular display element; and

said display control section renders said display section to display the display object with said N rectangular display elements each corresponding to M (M is a natural number) pixels successively arranged along the longitudinal center line of each of said rectangular display element so that said N display elements are represented by a group of pixels in an M×

N matrix.

3. A display apparatus according to claim 2, wherein:

the display object is an image of a letter;

said display control section includes

(a) a normal letter image information obtaining section for obtaining normal letter image information of a letter image which is M times larger than the original size of the last-named letter image in a longitudinal direction parallel to the longitudinal center lines of said display elements and N times larger than the original size of said letter image in said predetermined direction with said N display elements corresponding to each of the pixels of said letter image, and

(b) an element brightness value computing section for computing first brightness values of the individual rectangular display elements, each corresponding to the M pixels successively arranged in said longitudinal direction, based on pixel values, provided one for each of the M pixels, of said normal letter image information; and

said display control section varies the color factors of said display elements in accordance with said first brightness values, which are computed by said element brightness value computing section, in such a manner that said display section displays said letter image in the original size.

4. A display apparatus according to claim 3, wherein:

said N display elements are different in color from one another; and

said display apparatus further comprises a brightness value converting section for converting, if said N display elements are identical in brightness value, said first brightness values to second brightness values in accordance with lightness characteristics of said respective N display elements in such a manner that said N display elements are identical in lightness.

5. A method of displaying a display object on a display section of a display apparatus by controlling a plurality of display elements constituting the display section, in which the display object is displayed with N (N is a natural number larger than one) display elements, each of said display elements corresponding to one or more pixels.

6. A display controlling apparatus for controlling the displaying state of a display section of a display apparatus in terms of color factors of a plurality of display elements, which constitute the display section, in such a manner that the display object is displayed on the display section with N (N is a natural number larger than one) display elements, each of said display elements corresponding to one or more pixels.

7. A letter image creating apparatus, communicably connected to a display section of a display apparatus, for creating a letter image that is to be displayed on the display section, in which N (N is a natural number larger than one) rectangular display elements successively arranged in a predetermined direction perpendicular to the longitudinal center line of the individual display element, each of the N display elements corresponding to M (M is a natural number) pixels successively arranged along the longitudinal center line of the display element so that the N display elements are represented by a group of pixels in an M×

N matrix, said apparatus comprising;

a normal letter image information obtaining section for obtaining normal letter image information of a letter image which is M times larger than the original size of the last-named letter image in a longitudinal direction parallel to the longitudinal center lines of the display elements and N times larger than the original size of said letter image in said predetermined direction with the N display elements corresponding to a pixel of said letter image; and

an element brightness value computing section for computing first brightness values of the individual rectangular display elements, each corresponding to the M pixels successively arranged in said longitudinal direction, based on pixel values, provided one for each of the M pixels, of said normal letter image information.

8. A letter image creating apparatus according to claim 7, wherein said element brightness value computing section obtains an average of said pixel values of the M pixels, and also computes said first brightness values of the corresponding rectangular display element based on said average.

9. A letter image creating apparatus according to claim 7, wherein:

the N rectangular display elements are different in color from one another; and

said letter image creating apparatus further comprises a brightness value converting section for converting, if the N display elements are identical in brightness value, said first brightness values to a second brightness values in accordance with lightness characteristics of the individual N rectangular display elements in such a manner that the N display rectangular elements are identical in lightness.

10. A letter image creating apparatus according to claim 9, wherein:

said element brightness value computing section serves to function as said brightness value converting section; and

said element brightness value computing section performs the conversion of said first brightness values to said second brightness values simultaneously with the computation of the first brightness values.

11. A letter image creating apparatus according claim 9, wherein:

said element brightness value computing section is connected to the display section via said brightness value converting section; and

said brightness value converting section performs said converting on said first brightness values that is to be directed to the each rectangular display elements.

12. A letter image creating apparatus according to claim 9, wherein:

the N rectangular display elements are three elements in red, green and blue, respectively; and

if the three display elements are identical in brightness value, said brightness value converting section performs said conversion of said first brightness values in such a manner that a ratio of said second brightness values of the red, green, and blue elements is 0.600±

0.100;

0.384±

0.100;

1.000±

0.100.

13. A letter image creating apparatus according to claim 10, wherein:

the N rectangular display elements are three elements in red, green and blue, respectively; and

if the three display elements are identical in brightness value, said brightness value converting section performs said conversion of said first brightness values in such a manner that a ratio of said second brightness values of the red, green, and blue elements is 0.600±

0.100;

0.384±

0.100;

1.000±

0.100.

14. A letter image creating apparatus according to claim 11, wherein:

the N rectangular display elements are three elements in red, green and blue, respectively; and

if the three display elements are identical in brightness value, said brightness value converting section performs said conversion of said first brightness values in such a manner that a ratio of said second brightness values of the red, green, and blue elements is 0.600±

0.100;

0.384±

0.100;

1.000±

0.100.

15. A letter image creating apparatus according to claim 7, further comprising a smoothing section for smoothing said first brightness values of the respective rectangular display elements with a matrix-shaped filter, as each of the display elements is regarded as M elements successively arranged in said longitudinal direction and having one M-th of said first brightness value obtained by said element brightness value computing section.

16. A letter image creating apparatus according to claim 7, further comprising a smoothing section for smoothing each said pixel values of said normal letter image information with a matrix-shaped filter.

18. A computer-readable recording medium according to claim 17, wherein said element brightness value computing section obtains an average of said pixel values of the M pixels, and also computes said first brightness values of the rectangular display elements based on said average.

19. A computer-readable recording medium according to claim 17, wherein:

the N rectangular display elements are different in color from one another; and

said letter image creating apparatus further comprises a brightness value converting section for converting, if the N display elements are identical in brightness value, said first brightness values to a second brightness values in accordance with lightness characteristics of the individual N rectangular display elements in such a manner that the N rectangular display elements are identical in lightness.

20. A computer-readable recording medium according to claim 17, wherein said medium further instructs a computer to function as a smoothing section for smoothing said first brightness values of the respective display elements with a matrix-shaped filter, as each of the display elements is regarded as M elements successively arranged in said longitudinal direction and having one M-th of said first brightness value computed by said element brightness value computing section.

21. A computer-readable recording medium according to claim 17, wherein said medium further instructs a computer to function as a smoothing section for smoothing each said pixel values of said normal letter image information.

17. A computer-readable recording medium in which a letter image creating program for creating a letter image to be displayed on a display section of a display apparatus is recorded, the display section including N (N is a natural number larger than one) rectangular display elements successively arranged in a predetermined direction perpendicular to the longitudinal center line of the individual display element, each of the N display elements corresponding to M (M is a natural number) pixels arranged along the longitudinal center line of the display element so that the N display elements are represented by a group of pixels in an M×

N matrix, wherein said letter image creating program instructs a computer to function as the following;

a normal letter image information obtaining section for obtaining normal letter image information of a letter image which is M times larger than the original size of the last-named letter image in a longitudinal direction parallel to the longitudinal center lines of the display elements and N times larger than the original size of said letter image in said predetermined direction with the N display elements corresponding to a pixel of the letter image; and

an element brightness value computing section for computing first brightness values of the individual rectangular display elements, each corresponding to the M pixels successively arranged in said longitudinal direction based on pixel values, provided one for each of the M pixels, of said normal letter image information.