Hewlett-packard Company

Gregg S Goyins

Dellas G Frederiksen

Jeff H Papke

Mark F Resman

There is provided a method and apparatus for categorizing substantially simultaneous inputs to a touchscreen. The method is described within a computer device having a display screen adapted to receive touchscreen input. In a first step, the display screen is divided into a plurality of sectors. Next, the sectors are sequentially scanned for input. When a plurality of substantially simultaneous inputs are sensed in respective sectors, the location by sector of each input is ascertained. A unique value is then assigned to each input received, the assigned values corresponding to the sequence in time of the respective inputs based upon the sequentially scanned sectors in which the inputs occurred. The apparatus includes a display screen adapted to receive touchscreen input. A touchscreen driver/sensor is provided to divide the display screen into a plurality of sectors and to sense input in each of the sectors. A sequence counter is used to actuate the driver/sensor to scan the display screen sectors sequentially and at predetermined intervals for input, and to assign a unique value to each input received.

Palm pressure rejection method and apparatus for touchscreens

A data processing system that prints characters using a raster-scan pixel representation employs an inversion technique to achieve the filling of interior pixels within a polygon. At intersections of segments that define edges of the polygon, a common pixel may be shared by the last pixel of a first line segment and a first pixel of a second line segment. The inversion action is inhibited when considering the last pixel of the aforesaid first segment and is turned on for the first pixel of the next segment. In this manner, double inversions that cause fill splinters are avoided. The data processing system also employs a method for rendering vectors with pen widths of varying magnitude where, based upon the angle of inclination of the vector, its end points are derived. The end points are then modified by addition of integer offset values to take into account differences between given pen widths and pixel-integer pen widths. Then, resultant co-ordinate end points are revised to provide an approximately square end, based upon the found angle of inclination. A procedure is also described for assuring a best choice of a pixel to turn ON at an intersection of line segments.

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Boise, ID, United States of America

Gregg S Goyins