Patent ID: 7663609
Filing Date: 2010-02-16
Classification: G06F,H01H

Abstract:
1. A touch input device for operation by a user to select an item from a plurality of items shown on a display, the touch input device comprising: a sensor having an operation plane for touching by the user with a finger, and when touched, the sensor generates a sensor signal indicating contact area of the finger with the operation plane, and the operation plane being pressed by the linger when the user selects an item from the display; and a controller connected to the sensor, the controller obtaining the finger contact area from the sensor signal, calculating an increase rate of the finger contact area over a predetermined time period, comparing the finger contact area increase rate with a predetermined increase rate threshold, comparing the finger contact area with a finger contact area threshold, and determining that the operation plane of the sensor has been pressed by the user to select an item when the finger contact area is greater than the finger contact area threshold in a state in which the finger contact area increase rate is greater than the increase rate threshold; and wherein the controller further samples the finger contact area during a predetermined time period to calculate an average finger contact area when the user is tracing the operation plane of the sensor with a finger, and the controller obtains the finger contact area threshold in accordance with the average finger contact area.