Daffodil International University

Science & Information Technology => Science Discussion Forum => Topic started by: tariq on December 10, 2011, 05:08:43 PM

Title: Touchpad
Post by: tariq on December 10, 2011, 05:08:43 PM

In this era of science we are using many gifts of science in every aspects of our life but without understanding the basic thing "How they are working". A very common thing of today's world is touchpad that every laptop has for its proper use. But do we ever thing how this thing actually works? How our finger movement is understood and then used for different operations. It is basically the magic of electronics.
There are three ways a touch can be sensed
1. Capacitive
2. Resistive
3. Surface acoustic wave
Capacitive sensors are commonly used in laptop touchpads. Two layers of grid sense the change in capacitance at the point of touch and trace the movement of finger. A transducer creates an electric signal based on the movement which is fed into the system to move the cursor and to perform other operations.
Some links for more clear picture

http://computer.howstuffworks.com/question716.htm
http://www.ehow.com/how-does_5006535_a-touchpad-work.html       

Title: Re: Touchpad
Post by: safiqul on December 11, 2011, 11:18:13 AM

Thanks for the information.

Title: Re: Touchpad
Post by: sami on December 24, 2011, 03:24:31 PM

Nice post Sir.
Thanks for sharing.... :)

Title: Re: Touchpad
Post by: Masuma Parvin on December 29, 2011, 03:27:08 PM

Thanks sir for the post.............

Title: Re: Touchpad
Post by: M Z Karim on December 29, 2011, 06:06:16 PM

Good post.

Title: Re: Touchpad
Post by: akabir on January 17, 2012, 07:05:42 PM

nice post sir