Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1991-10-07
1995-07-11
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345145, G09G 302
Patent
active
054325315
ABSTRACT:
A coordinate processor for a computer system having an absolute position pointing device (10) such as a touch sensitive display screen comprises stimulus detection means (200) for detecting a tactile stimulus of an absolute position pointing device (10) and directed to a point within a data display area (610) of a computer system. The processor further comprises coordinate locking means (210-320) for locking a current cursor position to the point within the display area corresponding to the tactile stimulus in response to said stimulus exceeding a predetermined threshold value. The processor permits the computer system to distinguish a stimulus of the pointing device (10) for repositioning the cursor within the data display area (610) from a stimulus of the pointing device (10) for issuing a button click command to the computer system. The processor may be embodied in an electronic logic circuit within a pointing device adapter portion of the computer system. Equally, the coordinate processor may be in the form of a central processing unit operating under the control of a computer program.
REFERENCES:
patent: 4914624 (1990-04-01), Dunthorn
patent: 5119075 (1992-06-01), Smith
Beardall Gavin D.
Calder Gary J.
International Business Machines - Corporation
McKinley Martin J.
Redmond Joseph C.
Weldon Ulysses
Wu Xiao M.
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