Touch Sensitive Keyboard System and Processing Apparatus and Method Thereof

A touch sensitive processing apparatus coupled to a touch sensitive input device and a host, wherein the touch sensitive input device comprises multiple parallel first electrodes, multiple parallel second electrodes, multiple parallel third electrodes, and an elastic dielectric layer between the second and third electrodes, wherein the touch sensitive input device comprises a key zone, the key zone comprises multiple key areas, each of the first electrodes and the second electrodes form multiple approximation intersection areas in the key zone, each of the second electrodes and the third electrodes form multiple pressing intersection areas in the key zone, each of the key areas comprises at least one of the approximation intersection areas and the pressing intersection areas, the touch sensitive processing apparatus comprising:

• an interface device coupled to the host;
• a driving circuit respectively coupled to the second electrodes;
• a sensing circuit respectively coupled to the first electrodes and the third electrodes;
• and
• a processor coupled to the interface device, the driving circuit, and the sensing circuit, and executing a program module, the program module is used to perform the following steps:
• having the driving circuit respectively drive the second electrodes in turn;
• having the sensing circuit respectively sense the first electrodes to produce a one-dimensional first sensing information consisting of multiple first sensing information and respectively sense the third electrodes to produce a one-dimensional third sensing information consisting of multiple third sensing information when each of the second electrodes is driven;
• piecing each of the one-dimensional first sensing information corresponding to its corresponding second electrode together into a two-dimensional first sensing information and piecing each of the one-dimensional third sensing information together into a two-dimensional third sensing information after all the second electrodes have been driven;
• calculating an approximating position of an external object according to the two-dimensional first sensing information and calculating a pressing position of the external object according to the two-dimensional third sensing information;
• calculating a reporting position according to the pressing position or the approximating position when the distance between the pressing position and the approximating position is within a range;
• determining whether the reporting position is in one of the key areas;
• and
• having the interface device send a key symbol corresponding to the key area into the host when the reporting position is in one of the key areas.