input devices (touchscreen only)

Question 1

how do resistive touchscreens work

Answer 1

1- they use multiple layers of material that transmits electric current

2- when top layer touches lower layer, the current changes and the location of where the screen was pressed is found

Question 2

advantages of resistive touchscreens

Answer 2

cheap to make

can be used when wearing a glove

Question 3

disadvantages of resistive touchscreens

Answer 3

poor in sunlight
easily scratched
doesn’t allow multi-touch

Question 4

how do capacitive touchscreens work

Answer 4

they have conductive layers
when the top layer is touched, the electric current changes
microprocessor works out the coordinates where the screen was touched

Question 5

advantages of capacitive touchscreens

Answer 5

good visibility in sunlight
very durable
allows multi-touch

Question 6

disadvantages of capacitive touchscreens

Answer 6

can only use bare fingers or a conductive stylus

Question 7

how do infrared touchscreens work

Answer 7

it detects heat or uses infra-red sensors to detect touch

microprocessor works out where the screen was touched

Question 8

advantages of infrared touchscreens

Answer 8

can use bare hands, gloved hands or a stylus
good screen durability
allows multi-touch

Question 9

disadvantages of infrared touchscreens

Answer 9

relatively expensive

heat-sensitive systems only allow bare hands to be used