Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1997-04-10
1998-08-04
Hofsass, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345174, 345179, 345156, 345157, 178 18, 178 19, G09G 500
Patent
active
057901058
ABSTRACT:
A pressure sensitive resistance tablet coordinate input device is provided which enables the cursor to be moved to a desired position on a PC display by pressing a tablet sheet (6) with a stylus, permits the stylus press-shift operation at the center of the tablet sheet (6) and maintains the continuity of control of the cursor movement even if the pressure to the tablet is once removed. The device is selectively switchable between an absolute value output data in which pressed-position data (x.sub.n,y.sub.n) is used as cursor control data (X.sub.n,Y.sub.n) or a relative value output mode in which relative position data is calculated by comparing pieces of pressed-position data before and after the stylus press-shift operation on the tablet sheet (6). The relative position data thus calculated is used as the cursor control data (X.sub.n,Y.sub.n). Since either one of the two modes of operation can be selected in accordance with the contact resistance value r.sub.P at the position of the tablet being pressed, it is possible to control the cursor movement corresponding to the operation, only by changing the method for pressing the tablet sheet (6).
REFERENCES:
patent: 4638119 (1987-01-01), Blesser et al.
patent: 5327161 (1994-07-01), Logan et al.
patent: 5343220 (1994-08-01), Veasy et al.
patent: 5428367 (1995-06-01), Mikan
patent: 5670755 (1997-09-01), Kwon
Hofsass Jeffery
Mannava Ashok
SMK Corporation
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