Method and apparatus for displaying higher color resolution on a hand-held LCD device
First Claim
1. A process for converting a full color bitmapped source image to a color mapped target image for display on a display system that uses color mapping data to generate a color image on a color display during active line scanning, comprising:
- subdividing said source image into image subdivisions that are sized to correspond with the frequency with which color mapping data used by said display system can be rewritten during said active line scanning; and
color quantizing each of said image subdivisions to produce a corresponding set of color mapping data that can be loaded into said display system for use in rendering said corresponding image subdivisions.
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Accused Products
Abstract
Effective color resolution of a limited-memory color-mapped display system such as a portable liquid crystal display (LCD) handheld video game system can be increased by changing the color mapping information during active display time (e.g., during the horizontal blanking interval between rasterization of successive lines on the display). A subset of the color mapping information can be rewritten during each horizontal blanking period. A full color bitmapped source image can be converted into a color-mapped image in a way that optimizes the use of such color map updates. Since photographic and photorealistic images typically don'"'"'t exhibit abrupt color changes between neighboring pixels, such techniques can result in display of a color image with very high color resolution (e.g., having as many as 2048 different colors) on hardware intended to permit simultaneous display of only a much smaller number of different colors (e.g., only 56 different colors simultaneously).
140 Citations
22 Claims
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1. A process for converting a full color bitmapped source image to a color mapped target image for display on a display system that uses color mapping data to generate a color image on a color display during active line scanning, comprising:
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subdividing said source image into image subdivisions that are sized to correspond with the frequency with which color mapping data used by said display system can be rewritten during said active line scanning; and
color quantizing each of said image subdivisions to produce a corresponding set of color mapping data that can be loaded into said display system for use in rendering said corresponding image subdivisions. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for converting a full color bitmapped source image to a color mapped target image for display on a display system that uses color mapping data to generate a color image on a color display during active line scanning, comprising:
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a subdivider that subdivides said source image into image subdivisions that are sized to correspond with the frequency with which color mapping data used by said display system can be rewritten during said active line scanning; and
a color quantizer that quantizes the colors within each of said image subdivisions to produce a corresponding set of color mapping data that can be loaded into said display system for use in rendering said corresponding image subdivisions. - View Dependent Claims (7, 8, 9, 10)
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11. A color-mapped display system that uses color mapping data to generate a color image on a color display during active line scanning comprising:
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a color display;
image generating circuitry that generates an image on said display during active line scanning based at least in part on color mapping data stored in a color map; and
a data updater coupled to said color map that updates said stored color mapping data during said active line scanning so as to increase the effective color resolution of said system. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A color-mapped display system that uses color mapping data to generate a color image on a color display during active line scanning comprising:
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a color display;
image generating means for generating an image on said display during active line scanning based at least in part on color mapping data stored in a color map; and
data updating means coupled to said color map for updating said stored color mapping data during said active line scanning so as to increase the effective color resolution of said system.
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Specification