Capacitive touch screen works and sensitivity oled module

Capacitive touch screen driven by the internal electrodes and receiving electrodes, the driving electrodes by a low voltage high frequency signal onto the receiving electrode form a stable current to the capacitive touch screen, when the body, due to body ground, the fingers and the formation of an equivalent capacitance screen capacitors, the high frequency signal flows through the equivalent capacitance of the ground, whereby the charge received by the receiver decreases, and when the finger closer to the transmitter, the charge decreases, the more obvious the last received by the receiving end The current intensity to determine the touch point. As for multi-touch, simply put, is to block the screen, in every region of each mutual capacitance module works independently, so the capacitive screen can independently detect regional touch case, for processing After multi-touch. Character LCD Module
Sensitivity
In the middle of "sauce" capacitive touch screen determines the sensitivity and response time. Affect the sensitivity of which is something called a contact diameter. We can be a capacitive touch panel is divided into a sharing of tiny area, and two close contact diameter is the distance between the centers of regions, the smaller the contact diameter, the higher recognition rate of the touch screen, for example, some touch needs of the entire area of ​​the belly of a finger pressed to recognize the signal, while others only need fingertips.
Take now the latest Windows 8 operating system, Microsoft Win8 touchscreen official contacts required minimum diameter is 9mm, which means that we use the touch screen when you want to compare your finger on the screen, pressing firmly to ensure contact area. If 9mm diameter as measured by this standard, then, in some cases, the system may not recognize the swipe gestures, for example, you take your finger contact area than small capacitance pen to write on the touch screen display handwriting but only intermittently, even with no response, so the smaller the diameter represents the touch contacts more outstanding. graphic lcd display module