Touchpad works

- Jan 25, 2018 -

Is a kind of input device that uses a finger sliding operation to move a cursor on a smooth touchpad. When the user's finger approaches the touch pad, the capacitance will change, and the touch pad itself will detect the capacitance change and convert it into coordinates. Touchpad is through capacitive sensing to know the movement of the finger, finger heat is not sensitive. The advantage is that the use of a wider range of all built-in, ultra-thin notebooks are applicable, and less power consumption, can provide handwriting input function; because it is no moving parts, use can ensure durability and reliability.

Touchpad with printed circuit board made of rows and columns of array; printing plate and the surface of the plastic film with a strong double-sided adhesive, the sensing principle is capacitive sensing sensor. A special IC underneath the surface of the touchpad constantly measures and reports this trajectory to ascertain the motion and location of the finger.

This device is a kind of input device that can move the cursor by the sliding operation of the finger on the smooth touchpad. Easy to use for beginners. Because the thickness of the touchpad is very thin. So can be designed for ultra-thin notebook computers, or keyboard. And not a mechanical design. Very easy to maintain.

Its working principle is that when the user's finger near the touch pad will make the capacitance change, the touchpad's own control IC will detect the capacitance change, converted into coordinates. Touchpad is through capacitive sensing to know the movement of the finger, finger heat is not sensitive. When the finger touches the board, the electrostatic field on the board changes. The touchpad sensor is just a finger track conduction line printed on the board surface.


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