Touch-pad digital computer pointing-device

Details Touch-pad digital computer pointing-device Touch-pad digital computer pointing-device

1995-10-27

1999-01-05

Saras, Steven J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345157, 345173, G09G 508

Patent

active

058568220

ABSTRACT:
A touch-pad digital computer pointing-device, for controlling a position of a cursor appearing on a display screen of a digital computer, senses and resolves respective locations within an active area at which concurrent multi-finger contacts occur. Multi-finger contacts with the active area activate or deactivate a drag-lock operating mode, computer power conservation, and other touch-pad operating characteristics such as the touch-pad's sensitivity to finger contact. The touch-pad also senses a velocity and direction for finger contact with the active area for use in transmitting data to the computer which effects continuous cursor movement across the computer's display screen in a direction fixed by the initial direction of contact movement across the active area. While there is no finger contact with the active area, the touch-pad monitors the active area and adjusts its operation to compensate for changes in the surrounding environment such as changes in temperature, humidity and atmospheric pressure.

REFERENCES:
patent: 4734685 (1988-03-01), Watanabe
patent: 5305017 (1994-04-01), Gerpheide
patent: 5327161 (1994-07-01), Logan et al.
patent: 5424756 (1995-06-01), Ho et al.
Diehl, Stanford, "Touchpads to Navigate By," Byte, p. 150, Oct. 1995.

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