Method for detecting touch points on a touch panel

摘要

A method for determining touch point coordinates on capacitive type touch panel includes following steps. A touch panel having a conductive layer, a plurality of first electrodes, and a plurality of second electrodes is provided. A first signal curve As1 is obtained by driving and sensing each first electrode. A second signal curve As2 is obtained by driving and sensing each second electrode. A third signal curve Bs1 is obtained by driving and sensing each first electrode, wherein the second electrode opposite to the sensed first electrode is grounded. A fourth signal curve Bs2 is gotten by driving and sensing each second electrodes, wherein the first electrode opposite to the sensed second electrode is grounded. The coordinates of the touch points are obtained by comparing the first signal curve As1, the second signal curve As2, the third signal curve Bs1, and the fourth signal curve Bs2.

主权项

1. A method for detecting touch points on a touch panel comprising:
providing a capacitive type touch panel comprising a conductive layer, a plurality of first electrodes and a plurality of second electrodes, wherein the conductive layer comprises relative low impedance in a direction X and a relative high impedance in a direction Y, and a first side and second side opposite the first side along the direction X; the plurality of first electrodes located on the first side and electrically connected to the conductive layer; and the plurality of second electrodes located on the second side and electrically connected to the conductive layer; obtaining a first signal curve As1 by inputting driving electrical signals to each of the plurality of first electrodes and sensing each of the plurality of first electrodes one by one, wherein rest of the plurality of first electrodes which are not sensed and the plurality of second electrodes are input a first potential during sensing each of the plurality of first electrodes one by one; getting a second signal curve As2 by inputting driving electrical signals to each of the plurality of second electrodes and sensing each of the plurality of second electrodes one by one, wherein rest of the plurality of second electrodes which are not sensed and the plurality of first electrodes are input a second potential during sensing each of the plurality of second electrodes one by one; obtaining a third signal curve Bs1 by inputting driving electrical signals again to each of the plurality of first electrodes and sensing each of the plurality of first electrodes one by one, wherein at least one of the plurality of second electrodes which opposite to the sensed one of the plurality of first electrodes is grounded during sensing each of the plurality of first electrodes one by one; and getting a fourth signal curve Bs2 by inputting driving electrical signals to each of the plurality of second electrodes again and sensing each of the plurality of second electrodes one by one, wherein at least one of the plurality of first electrodes which opposite to the sensed one of the plurality of second electrodes is grounded during sensing each of the plurality of second electrodes one by one; and determining the number of touch points and obtaining coordinates of the touch points on the touch panel by comparing the first signal curve As1, the second signal curve As2, the third signal curve Bs1, and the fourth signal curve Bs2.