Abstract: A touch system has a touch device and an input device. The touch system executes a first mode and a second mode at different times. In the first mode, the touch device transmits a modulation signal to drive the touch electrodes and to be used as an uplink signal. The input device receives the modulation signal. In the second mode, the touch device receives the downlink signal from the input device. Thus, the touch device does not have to transmit the driving signal and the uplink signal at different times. Then the time is saved for the rest work periods so that every work periods get longer length of time.

Abstract: A touch system has a touch device and an input device. The touch system executes a first mode and a second mode at different times. In the first mode, the touch device transmits a modulation signal to drive the touch electrodes and to be used as an uplink signal. The input device receives the modulation signal. In the second mode, the touch device receives the downlink signal from the input device. Thus, the touch device does not have to transmit the driving signal and the uplink signal at different times. Then the time is saved for the rest work periods so that every work periods get longer length of time.

Abstract: A hierarchical sensing method for a touch panel is disclosed. The touch panel has a matrix of points for detecting a touch or touches. The method includes dividing the points into a plurality of blocks; selecting several points in each one of the blocks as designated points; sensing first data from each one of the designated points; determining a set of possible touched points according to the first data sensed from each one of the designated points; sensing second data from the set of possible touched points; and determining if each one of the possible touched points is an actual touched point according to the second data sensed from said one possible touched point. By using the present invention method, a faster sensing speed and a greater sensing accuracy can be achieved.