Mapping image data samples to pixel sub-components on a striped display device

• US 6,219,025 B1
• Filed: 10/07/1999
• Issued: 04/17/2001
• Est. Priority Date: 10/07/1998
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Hitchcock, Gregory C., Duggan, Michael, Hill, William, Whitted, J. Turner, Keely, Leroy B. Jr.
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Tran, Henry N.
• Application Number:
  US09/414,147
• Time in Patent Office: 558 Days
• Field of Search: 345/114, 345/136, 345/137, 345/138, 345/149, 345/150, 345/152
• US Class Current: 345/589
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• 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 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/0414 Vertical resolution change
• CPC Class Codes: G09G 2340/0421 Horizontal resolution change
• CPC Class Codes: G09G 2340/0457 Improvement of perceived resolution by subpixel rendering
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/24 Generation of individual character patterns
• CPC Class Codes: G09G 5/28 for enhancement of character form, e.g. smoothing

Abstract

Methods and apparatus for sampling image data and mapping the samples to pixel sub-components which form a pixel element of an LCD display so that each pixel sub-component has a different portion of the image mapped thereto. The methods can be used with conventional color LCD displays that include pixels consisting of three non-overlapping red, green and blue rectangular pixel sub-elements or sub-components. The pixel sub-components can be arranged on the display device to form horizontal or vertical stripes of individual colors. The separately-controllable nature of individual RGB pixel sub-components is used to effectively increase a screen'"'"'s resolution in the dimension perpendicular to the dimension in which the screen is striped. A scan conversion process maps samples of the image data to individual pixel sub-components, resulting in each of the pixel sub-components representing a different portion of the image. The color values are independently generated for each of the red, green, and blue pixel sub-components based on different portions of the image, rather than the color values for the entire pixel being generated based on a single sample or the same portion of the image.

Claims

1. In a computer system including a processing unit and a display device for displaying an image, the display device having a plurality of pixel sub-components each of which has one of three different colors, a method for improving resolution of the displayed image comprising the steps for:

mapping samples of information representing an image to individual pixel sub-components as opposed to mapping the samples to an entire pixel, each of the pixel sub-components having mapped thereto a spatially different set of one or more of the samples, the pixel sub-components being arranged to form stripes on the display device of same-colored pixel sub-components;

generating a separate luminous intensity value for each pixel sub-component as opposed to each full pixel, the separate luminous intensity value for each sub-component being based on the different set of one or more samples mapped thereto; and

displaying the image on the display device by applying the separate luminous intensity values to each sub-component rather than to entire pixels, resulting in each of the pixel sub-components, rather than entire pixels, representing the displayed image.

2. A method as defined in claim 1, further comprising the step of scaling the information representing the image in the direction perpendicular to the stripes by a factor greater than in the direction parallel to the stripes prior to the step of mapping the samples.

3. A method as defined in claim 1, wherein the step of mapping the samples is conducted such that each of the pixel sub-components of the pixel has mapped thereto one and only one of the samples.

4. A method as defined in claim 1, wherein the step of mapping the samples is conducted such that at least one of the pixel sub-components of the pixel has mapped thereto two or more of the samples.

5. A method as defined in claim 1, wherein different numbers of samples are mapped to each of the pixel sub-components.

6. A method as defined in claim 1, wherein the information representing the image includes an outline of the image and has associated therewith a foreground color and a background color.

7. A method as defined in claim 1, wherein the step of generating a luminous intensity value for each pixel sub-component comprises the step of selecting an on or off luminous intensity value based on the relative position of the image and the set of one or more samples mapped to the pixel sub-component.

8. In a computer system including a processing unit and a display device for displaying an image, the display device having a plurality of pixel sub-components each of which has one of three different colors, a method for improving resolution of the displayed image comprising the acts of:

sampling information representing an image so as to obtain a plurality of samples;

mapping a first set of one or more of the samples to a first colored pixel sub-component of the display device, the pixel sub-components of the display device being arranged to form stripes on the display device of same-colored pixel sub-components;

mapping a second set of one or more of the samples to a second colored pixel sub-component;

mapping a third set of one or more of the samples to a third colored pixel sub-component, wherein the first, second, and third sets are spatially different one from another;

generating, for each of the first, second, and third pixel sub-components, a separate luminous intensity value based on the particular set of one or more samples mapped thereto; and

displaying the image on the display device by separately applying to each of the first, second, and third pixel sub-components the separate luminous intensity values, resulting in each of the pixel sub-components rather than entire pixels representing the displayed image.

9. A method as defined in claim 8, wherein the act of displaying the image results in a text character that has a portion with a dimension, in the direction perpendicular to the stripes, having a value that is not an integer multiple of the value of the dimension of the pixel sub-components in the direction perpendicular to the stripes.

10. A method as defined in claim 9, wherein the portion of the text character is a stem of the text character, and wherein the dimension of the stem is not an integer multiple of the width of the pixel sub-components.

11. A method as defined in claim 9, wherein the display device comprises a liquid crystal display, and wherein the first, second, and third pixel sub-components have a red, green, and blue color, respectively.

12. A method as defined in claim 8, further comprising the act of scaling the information representing the image in the direction perpendicular to the stripes by a factor greater than in the direction parallel to the stripes prior to the act of sampling the information.

13. A method as defined in claim 8, further comprising the act of performing a color processing operation on the information representing the image, the color processing operation compensating for color distortion that has been introduced to the information as the different sets of one or more samples were mapped to the first, second, and third pixel sub-components.

14. A computer program product for implementing, in a computer system including a processing unit and a display device for displaying an image, the display device having a plurality of pixel sub-components each of which has one of three different colors, a method for improving resolution of the displayed image, the computer program product comprising:

a computer-readable medium carrying executable instructions for performing the method, wherein the method comprises the steps for;

mapping samples of information representing an image to individual pixel sub-components as opposed to mapping the samples to an entire pixel, each of the pixel sub-components having mapped thereto a spatially different set of one or more of the samples, the pixel sub-components being arranged to form stripes on the display device of same-colored pixel sub-components;

generating a separate luminous intensity value for each pixel sub-component as opposed to each full pixel, the separate luminous intensity value for each sub-component being based on the different set of one or more samples mapped thereto; and

displaying the image on the display device by applying the separate luminous intensity values to each sub-component rather than to entire pixels, resulting in each of the pixel sub-components, rather than entire pixels, representing the displayed image.

15. A computer program product as defined in claim 14, wherein the method further comprises the step of scaling the information representing the image in the direction perpendicular to the stripes by a factor greater than in the direction parallel to the stripes prior to the step of mapping the samples.

16. A computer program product as defined in claim 14, wherein the executable instructions perform the step for mapping the samples such that each of the pixel sub-components has mapped thereto one and only one of the samples.

17. A computer program product as defined in claim 14, wherein the executable instructions perform the step for mapping the samples such that at least one of the pixel sub-components has mapped thereto two or more of the samples.

18. A computer program product as defined in claim 14, wherein the executable instructions map different numbers of samples to each of the pixel sub-components.

19. A computer program product as defined in claim 14, wherein the information representing the image includes an outline of the image and has associated therewith a foreground color and a background color.

20. A computer program product as defined in claim 14, wherein the step of generating a luminous intensity value for each pixel sub-component comprises the step of selecting an on or off luminous intensity value based on the relative position of the image and the set of one or more samples mapped to the pixel sub-component.

21. A computer program product for implementing, in a computer system including a processing unit and a display device for displaying an image, the display device having a plurality of pixel sub-components each of which has one of three different colors, a method for improving resolution of the displayed image, the computer program product comprising:

a computer-readable medium carrying executable instructions for performing the method, wherein the method includes the acts of;

sampling information representing an image so as to obtain a plurality of samples;

mapping a first set of one or more of the samples to a first colored pixel sub-component of the display device, the pixel sub-components of the display device being arranged to form stripes on the display device of same-colored pixel sub-components;

mapping a second set of one or more of the samples to a second colored pixel sub-component;

mapping a third set of one or more of the samples to a third colored pixel sub-component, wherein the first, second, and third sets are spatially different one from another;

generating, for each of the first, second, and third pixel sub-components, a separate luminous intensity value based on the particular set of one or more samples mapped thereto; and

displaying the image on the display device by separately applying to each of the first, second, and third pixel sub-components the separate luminous intensity values, resulting in each of the pixel sub-components rather than entire pixels representing the displayed image.

22. A computer program product as defined in claim 21, wherein the act of displaying the image results in a text character that has a portion with a dimension, in the direction perpendicular to the stripes, having a value that is not an integer multiple of the value of the dimension of the pixel sub-components in the direction perpendicular to the stripes.

23. A computer program product as defined in claim 22, wherein the portion of the text character is a stem of the text character, and wherein the dimension of the stem is not an integer multiple of the width of the pixel sub-components.

24. A computer program product as defined in claim 22, wherein the display device comprises a liquid crystal display, and wherein the first, second, and third pixel sub-components have a red, green, and blue color, respectively.

25. A computer program product as defined in claim 21, wherein the method further comprises the act of scaling the information representing the image in the direction perpendicular to the stripes by a factor greater than in the direction parallel to the stripes prior to the act of sampling the information.

26. A computer program product as defined in claim 21, wherein the method further comprises the act of performing a color processing operation on the information representing the image, the color processing operation compensating for color distortion that has been introduced to the information as the different sets of one or more samples were mapped to the first, second, and third pixel sub-components.

27. A display device for use with a computer system including a processing unit and a memory device, the display device being capable of displaying an image and comprising:

a plurality of pixel sub-components each having one of three different colors the pixel sub-components being arranged to form stripes on the display device of same-colored pixel sub-components; and

a computer program product including a computer-readable medium carrying executable instructions that, when stored in the memory device, enable the computer system to implement a method for improving resolution of the displayed image, the method comprising the steps for;

mapping samples of information representing an image to individual pixel sub-components as opposed to mapping the samples to an entire pixel, each of the pixel sub-components having mapped thereto a spatially different set of one or more of the samples, the pixel sub-components being arranged to form stripes on the display device of same-colored pixel sub-components;

generating a separate luminous intensity value for each pixel sub-component as opposed to each full pixel, the separate luminous intensity value for each sub-component being based on the different set of one or more samples mapped thereto; and

displaying the image on the display device by applying the separate luminous intensity values to each sub-component rather than to entire pixels, resulting in each of the pixel sub-components, rather than entire pixels, representing the displayed image.

28. A display device as defined in claim 27, wherein the display device further comprises a liquid crystal display.

29. A display device as defined in claim 28, wherein the at least three pixel sub-components comprise a red pixel sub-component, a green pixel sub-component, and a blue pixel sub-component, each being separately controllable.

30. A display device as defined in claim 28, further comprising a displayed text character that constitutes at least a portion of the image, the text character being displayed on the display device as a result of the step of displaying the image.

31. A display device as defined in claim 30, wherein the text character has a portion with a dimension, in the direction perpendicular to the stripes, having a value that is not an integer multiple of the value of the dimension of the pixel sub-components in the direction perpendicular to the stripes.

32. A method as defined in claim 31, wherein the portion of the text character is a stem of the text character, and wherein the width of the stem is not an integer multiple of the width of the pixel sub-components.

33. A display device for use with a computer system including a processing unit and a memory device, the display device being capable of displaying an image and comprising:

a plurality of pixel sub-components each having one of three different colors, the pixel sub-components being arranged to form stripes on the display device of same-colored pixel sub-components; and

a computer program product including a computer-readable medium carrying executable instructions that, when stored in the memory device, enable the computer system to implement a method for improving resolution of the displayed image, the method comprising the acts of;

sampling information representing an image so as to obtain a plurality of samples;

mapping a first set of one or more of the samples to a first colored pixel sub-component of the display device, the pixel sub-components of the display device being arranged to form stripes on the display device of same-colored pixel sub-components;

mapping a second set of one or more of the samples to a second colored pixel sub-component;

mapping a third set of one or more of the samples to a third colored pixel sub-component, wherein the first, second, and third sets are spatially different one from another;

generating, for each of the first, second, and third pixel sub-components, a separate luminous intensity value based on the particular set of one or more samples mapped thereto; and

displaying the image on the display device by separately applying to each of the first, second, and third pixel sub-components the separate luminous intensity values, resulting in each of the pixel sub-components rather than entire pixels representing the displayed image.

34. A display device as defined in claim 33, wherein the display device further comprises a liquid crystal display.

35. A display device as defined in claim 34, wherein the first, second, and third pixel sub-components comprise a red pixel sub-component, a green pixel sub-component, and a blue pixel sub-component, respectively, each being separately controllable.

36. A display device as defined in claim 34, further comprising a displayed text character that constitutes at least a portion of the displayed image.

37. A display device as defined in claim 36, wherein the text character has a portion with a dimension, in the direction perpendicular to the stripes, having a value that is not an integer multiple of the value of the dimension of the pixel sub-components in the direction perpendicular to the stripes.

38. A method as defined in claim 37, wherein the portion of the text character is a stem of the text character, and wherein the width of the stem is not an integer multiple of the width of the pixel sub-components.