Coordinate inputting method and apparatus, and information proce

Details Coordinate inputting method and apparatus, and information proce Coordinate inputting method and apparatus, and information proce

1996-05-09

1998-07-07

Lao, Lun-Yi

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345174, 345179, 345157, 463 37, 178 18, G09G 300

Patent

active

057776059

ABSTRACT:
The invention provides a method and apparatus for inputting coordinate information in which a relative coordinate mode and an absolute coordinate mode is automatically switched depending on a contact area. If a tablet is operated with a finger or a pen, a detection circuit detects the contact area. If the contact area is greater than a predefined threshold value, a signal corresponding to the relative coordinates of the point P at which the finger or the pen is contact with the tablet is output. If the contact area is equal to or smaller than the predefined threshold value, a signal corresponding to the absolute coordinates of the point P is output. The above output signal is supplied to a transmission module. The transmission module performs frequency modulation on the received signal and transmits the resultant signal via a transmission antenna. There are also provided buttons used for clicking operations. If a power switch is turned on, a power supply voltage is supplied from a battery via a power supply circuit.

REFERENCES:
patent: 4988982 (1991-01-01), Rayner et al.
patent: 5025410 (1991-06-01), Morita
patent: 5134689 (1992-07-01), Murakami et al.
patent: 5231380 (1993-07-01), Logan
patent: 5424756 (1995-06-01), Ho et al.

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