G - Physics – 09 – G
Patent
G - Physics
09
G
375/38, 375/11.1
G09G 3/00 (2006.01) G06F 3/033 (2006.01)
Patent
CA 1241137
PRECISION DISPLAY POSITION DESIGNATION SYSTEM USING COARSE TOUCH PANEL INPUT ABSTRACT A display includes circuitry for locating a cursor (50) or similar position designation on a display (22) which might, for example, represent a geographical area on a keyboard. A touch panel array (24) of photo- transistors (48) and light emitting diodes (46) provides a matrix of light beam paths across the face (12) of the display (22), or a separate detection unit, which are interrupted when a pointer such as a finger points to a particular location on the display (12) and inter- rupts the light beams which is a coarse indication of a new cursor position. The fine position of the cursor (50) is calculated by using both the available positional data and also velocity corrections and/or acceleration based upon movement of the finger from the prior location to the new position. Initial transient position desig- nation errors are eliminated by delaying until the array of light beams have been interrupted for several scan intervals at which time the fixed position is established or "jumped to"; and terminating transient errors are eliminated by deleting the last few position indications just prior to when the array of beams has remained uniterrupted for several scan intervals.
481793
Hughes Aircraft Company
Sim & Mcburney
LandOfFree
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