COMPUTER HARDWARE
INPUT DEVICES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
When touched by a finger, there is a change in the electric field at that position
|
|
|
When touched by a finger, the infra-red beam is interrupted
|
|
|
Two sound wave transducers detect a reduction in the sound wave amplitude
|
|
|
When pressed by a finger, the two conducting layers make contact and complete a circuit
|
Detailed explanation-1: -An infrared touchscreen uses an array of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. These LED beams cross each other in vertical and horizontal patterns. This helps the sensors pick up the exact location of the touch.
Detailed explanation-2: -Capacitive touch screens This conductive material responds when contacted by another electrical conductor, like your bare finger. When you touch your screen, an electric circuit is completed at the point where your finger makes contact, changing the electrical charge at this location.
Detailed explanation-3: -Pressing the surface of the screen presses the electrodes in the film and the glass to come into contact, resulting in the flow of electrical current. The point of contact is identified by detecting this change in voltage.
Detailed explanation-4: -The infrared touchscreen works by detecting interruptions of infrared beams emitted by LEDs embedded in the frame around the touchscreen overlay. There are two rows of IR LEDs, which generate horizontal and vertical invisible IR beams. They form a large beam grid that covers the surface of the overlay.