Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1997-12-12
2000-03-28
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
G09G 500
Patent
active
06043810&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a digitizer controller, and more particularly, to a digitizer controller which can be implemented in an integrated circuit of a semiconductor device and applied to stylus type, finger touch type and touch panel type digitizers.
BACKGROUND ART
Personal computers, portable transmitters, personal information processor, etc., process text and graphics data using an input apparatus such as a keyboard, a mouse or a digitizer.
The digitizer is for digitally detecting the position of a pen or a finger on a flat panel specifically manufactured to output X and Y coordinates of the position and has merits in that characters and figures both can be input easily and accurately in comparison to a conventional mouse, keyboard or scanner. Further, the digitizer is envisioned to replace the conventional input devices.
The digitizer is classified into three types: a stylus type using a specially devised pen; a finger touch type using a finger; and a touch panel type using a common pen or any pointed object.
The stylus type is widely used in graphics or CAD applications. The finger touch type is used in an apparatus adopting a touch screen display. The touch panel type is used in a personal digital assistance (PDA) or an electronic organizer.
To implement a digitizer system, a tablet for assigning coordinate data, a pointing device such as a stylus, a pen or a finger for locating a position on a coordinate system represented by the tablet, and a digitizer controller for controlling the above elements.
The tablet has a specially manufactured rectangular panel. The panel is coated with a resistive film for the stylus type or the finger touch type or is constituted by two sheets of resistive material separated by a spacer and concurrently arranged to be capable of contact by pressure for the touch panel type.
The location of the pointing device is recognized by the differences in detected signals according to the pressed position when an AC (the stylus and the finger touch types) or DC (the touch panel type) signal is applied at the four corners of the panel. Such a panel and controller are disclosed in U.S. Pat. Nos. 4,600,807, 4,649,232, 4,650,962 and 4,665,283, thus a description thereof will be omitted.
However, since the conventional digitizer controller is specifically designed for only one of the three types described above, it is inconvenient to equip a corresponding digitizer controller according to each type. Also, since the digitizer controller is embodied with discrete circuit elements, the size of the apparatus becomes large and power consumption is high.
DISCLOSURE OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide a digitizer controller which can be adopted for each of the stylus, finger touch and touch panel types.
It is a second object of the present invention to provide an improved driving method in the finger touch type.
It is a third object of the present invention to provide a driving apparatus of the finger touch type befitting the above driving method.
It is a fourth object of the present invention to provide a method of automatically adjusting the band pass filtering characteristics constituting the digitizer controller.
It is a fifth object of the present invention to provide an apparatus for automatically adjusting the band pass filtering characteristics constituting the digitizer controller.
It is a sixth object of the present invention to provide an interfacing portion befitting the digitizer controller.
It is a seventh object of the present invention to provide a generator of a panel driving signal befitting the digitizer controller.
It is an eighth object of the present invention to provide a generator of a panel driving control signal befitting the digitizer controller.
It is a ninth object of the present invention to provide a power saving circuit befitting the digitizer controller.
Accordingly, to achieve the first object there is provided a digitizer controller comprising: a panel drive signal
REFERENCES:
patent: 4839634 (1989-06-01), More et al.
patent: 4860372 (1989-08-01), Kuzunki et al.
patent: 5213381 (1993-05-01), Anderson
patent: 5583543 (1996-12-01), Takahashi et al.
patent: 5643339 (1997-07-01), Mori et al.
patent: 5747748 (1998-05-01), Zigler
An Byoung-kwon
Kim Do-youn
Hjerpe Richard A.
Laneau Ronald
Samsung Electronics Co,. Ltd.
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