Color temperature compensation for digital display system with color wheel
AssigneeTexas Instruments Incorporated
InventorsRichard C. Meyer, Gerhard P. Deffner, Austin L. Huang, Joseph K. Masters
Life of this patent
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Abstract
A method of adjusting color temperature of images displayed by a display system (10) whose images are based on sequential pixel data and are filtered with a color wheel (15, 15', 15"). The relative display times for each color are adjusted to result in a corresponding adjustment of color temperature. In a first embodiment (FIG. 2), the size of the color wheel's segments are changed as well as the display times for data corresponding to each segment. In a second embodiment (FIG. 3), the display times for data corresponding to one or more segments are decreased with a black display time to fill in the difference.
Claims18
A method of adjusting the color temperature of a display generated by light filtered through a color wheel and represented by sequential pixel data for each color, comprising the steps of:
- increasing the size of a segment of said color wheel corresponding to a dominant color, thereby providing a dominant color segment;
- increasing the display time for the pixel data of said dominant color by an amount of time proportional to the increase in the size of said dominant color segment;
- decreasing the size of a segment of said color wheel corresponding to a non-dominant color, thereby providing a non-dominant color segment;
- decreasing the display time for the pixel data of said non-dominant color by an amount of time proportional to the decrease in the size of said non-dominant color segment.
A method of adjusting the color temperature of a display generated by light filtered through a color wheel and represented by sequential pixel data for each color, comprising the steps of:
- selecting at least one color of said color wheel as a dominant color;
- decreasing the display time for pixel data of a non-dominant color;
- and
- providing a black display period for an amount of time equal to the decrease in the display time of said non-dominant color, during the time that pixel data of said non-dominant color would otherwise be displayed.
A color display system, comprising:
- a signal interface for receiving an image data signal as pixel data in sequential color form or for converting said signal to pixel data in sequential color form;
- a processor for receiving said pixel data from said signal interface, and for preparing said pixel data for display;
- a frame memory for storing said pixel data;
- a spatial light modulator for receiving said pixel data from said frame memory, and for generating sequential color images based on said pixel data;
- a color wheel for filtering light incident to, or reflected by, said spatial light modulator, wherein said color wheel has a dominant-color segment larger than other segments;
- and
- a timing unit for defining display times for the pixel data corresponding to each color, such that pixel data corresponding to the dominant color is displayed for a longer period of time than pixel data corresponding to other colors of said color wheel.
Dependencies are inferred from the claim text.