Patent ID: 8970527
Filing Date: 2015-03-03
Classification: G06F

Abstract:
1. A capacitive touch panel having mutual capacitance and self capacitance sensing modes, comprising: a capacitive touch panel, having a plurality of first conductor lines arranged in a first direction and a plurality of second conductor lines arranged in a second direction, wherein the first conductor lines and the second conductor lines include parasitic and stray capacitance respectively, and a mutual capacitance is formed at each overlap of the first and second conductor lines; a first switch device, connected to the capacitive touch panel; a second switch device, connected to the capacitive touch panel; a driving device, connected to the first switch device, for driving the capacitive touch panel through the first switch device; a sensing device, connected to the second switch device, for sensing a signal outputted by the capacitive touch panel through the second switch device; and a control device, connected to the first switch device, the second switch device, the driving device, and the sensing device, for configuring the first switch device and the second switch device to allow the capacitive touch panel to enter into a self capacitance mode, such that the driving device and the sensing device perform a self capacitance sensing, and to enter into a mutual capacitance mode, such that the driving device and the sensing device perform a mutual capacitance sensing; wherein the capacitive touch panel includes the k first conductor lines arranged in the first direction and the k second conductor lines arranged in the second direction, the first switch device includes k 1-to-2 switches, the driving device includes k drivers, and an i-th 1-to-2 switch has a first terminal connected to an i-th driver, a second terminal connected to an i-th second conductor line, and a third terminal connected to an i-th first conductor line, where 1≦i≦k; wherein when the sensing device performs the self capacitance sensing, the control device determines that a number of touch points on the capacitive touch panel is smaller than a second predetermined number and accordingly maintains configuration of the first switch device and second switch device, such that the sensing device performs the self capacitance sensing, and otherwise the control device configures the first switch device and the second switch device, such that the sensing device performs the mutual capacitance sensing.