Q:
I have a HP laptop, now I want to know the working principle of the laptop touchpad, and what’s the note about this? Hope to get your any suggestion and help, thank you!
A:
Laptop touchpad, an input device on smooth touchpad, with finger’s slippage to move the cursor. As the touchpad is quite thin, so it’s proper for super thin laptop. The working principle, easily speaking, is that when user’s finger touches the touchpad, capacitance will change and control IC would inspect the capacitance modification, then converting to the coordinates. Touchpad gets to know the finger move situation by capacitance induction, but not sensitive for the heat from fingers. When fingers get to the touchpad, the static filed on the board will change.
  Touchpad is the most popular and broadly used laptop mouse so far, except IBM and Toshiba laptops, HP laptops almost all use touchpad. It’s quite easy to use, get to the touchpad downside with your fingers, then cursor will move relevantly. As for the third generation of touchpad, the function has already been expanded to hand writing board, which could directly input by hand writing.
  The advantage of touchpad is flexible reaction and fast move. The disadvantage is also over flexible, which makes orientation precision low; when using the laptop for a long time and the fingers are sweat, the mouse will not act well, often gets trackslip, which has a bad adaptability to the environment, not proper to work in damp and dusty environment.
  A special integrated cir