Input devices

Input devices

1. Touchscfeens

   • Types
     • Resistive
     • Infra-red
     • Capacitive
       • Heat
       • Optical
   • Features
     • Carries out the functions of pointing devices
     • Most common type of input devices
     • Used in everyday devices, POS checkout tills
   • Advantages
     • No waiting necessary since input and output are both done at the same time.
     • With multi-touch functions, various operations like zooming or rotating can be done.
     • Bigger screen due to lack of buttons
     • Space is saved since input and output functions are merged
     • Lesser breakable buttons
   • Disadvantages
     • Having a big screen and large computing means a smaller battery life.
     • The screen is fragile and if dropped, the whole device can become irresponsive.
     • No-one who is visually impaired can use it since there are no buttons or braille.
     • Expensive
     • Lesser control since fingers are used instead of a keyboard. (Except for devices that use styluses).