Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Patent
1994-12-07
2000-07-18
Shalwala, Bipin
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
345156, 345164, 345168, G06F 1500
Patent
active
060914041
ABSTRACT:
The present invention relates to a trackball for a portable computer, which can be operated when not only is a trackball mounted on the main body of the portable computer, but is also detached from the main body of the computer. To achieve the aformentioned object, there is provided a trackball, which is capable of detecting whether it is mounted on or detached from the body of a portable computer, for transmitting a cursor movement signal through a wire when the trackball is mounted on the body of the portable computer, or a wireless cursor movement signal into the air when the trackball is detached from the body of the portable computer, and an interface employed inside the portable computer having an system controller, which is capable of detecting whether the trackball is mounted on or detached from the body of the computer, for processing the cursor movement signal through the wire when the trackball is mounted on the body of the portable computer, or for processing the wireless cursor movement signal through the air when the trackball is detached from the body of the portable computer.
REFERENCES:
patent: 4754268 (1988-06-01), Mori
patent: 5049863 (1991-09-01), Oka
patent: 5166668 (1992-11-01), Aoyagi
patent: 5546334 (1996-08-01), Hsieh et al.
Hong Seung Seog
Hyun Sang Cheon
Kim Jae Myon
Kovalick Vincent E.
Shalwala Bipin
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