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US 2008/0074294 A1Published application
System for controlling keyboard
AssigneeCompal Electronics, Inc.
InventorsChi-Hsin Lin, Yi-Hung Shen
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Abstract
A system for controlling a keyboard is provided. The present invention adopts a structure integrating a scanning unit into a keyboard device. After scanning the keyboard, a key matrix position of a pressed key is sent to a control device. By looking up a programmable matrix table stored in the control device, a corresponding scan code is found out. Therefore, a circuit disposed between the keyboard device and the control device is simplified and the manufacturing cost can be reduced.
Claims9
A system for controlling a keyboard, comprising:
- a keyboard device, comprising:
- an input unit, for providing a control signal;
- a scan unit, coupled to the input unit, for scanning the keyboard device according to the control signal and providing a scan signal;
- a first output interface, coupled to the scan unit, for outputting the scan signal;
- a control device, disposed in a system host, comprising:
- an input interface, connected to the first output interface of the keyboard device, for receiving the scan signal;
- a storage unit, for storing a key matrix table;
- a processing unit, coupled to the input interface and the storage unit, for determining the scan signal by means of looking up the key matrix table and converting the scan signal into a corresponding scan code;
- and
- a second output interface, coupled to the processing unit, for outputting the scan code to the system host.
7 more elements
Dependencies are inferred from the claim text.