With the development of touch technology, touch input devices have been widely used in many end electronic products. Because being capable of providing a better controlling and various interface operation ways, touch input devices have replaced the traditional input devices, such as mouse and keyboard, and accordingly the end electronic products need less space and consequentially solve the issue of being inconvenient to carry the peripheral input device.
Based on the touch technology, touch panels can be categorized to resistive, capacitive, optical and sound wave types; wherein the capacitive touch panel currently is relatively more popular in the market and has a higher market share. However, there still has some problems needed to be solved in the conventional capacitive touch sensing system. For example, a capacitive touch sensing system may result in an error operation while a touch panel thereof is being touched by a palm or a wrist of a user; or, for eliminating the effect of wrong touching, the sensing system may be designed to have a complex operation, which may consequentially lead to a long operation time.