IGCSE Computer Science Input - Touch Screen

"Uses human-skin as a conductor of electricity"

Which type of Touch-screen is the most accurate to this statement?

• Capacitive

• Resistive

• Infrared

"When a finger (or a special stylus) touch the screen, the electrostatic field of the conductive layer changed. "

Which type of touch-screen has this characteristic?

• Capacitive

• Infrared

• Resistive

What is a disadvantage of capacitive touch screen?

• Better image clarity than resistive screens, especially in strong sunlight

• They are sensitive to electromagnetic radiation (such as magnetic fields or microwaves).

• Projective capacitive screens allow multi-touch.

• Very durable screens that have high scratch resistance

What is the advantage of capacitive touch screen?

• Better image clarity than resistive screens, especially in strong sunlight

• Surface capacitive screens only work with bare fingers or a special stylus.

• They are sensitive to electromagnetic radiation (such as magnetic fields or microwaves).

There are two types of capacitive touch-screen. Which type only works with bare finger or stylus?

• Surface Capacitive

• Projective Capacitive

Which type of capacitive touch screen works with bare fingers, stylus or gloves?

• Projective Capacitive

• Surface Capacitive

What are the characteristics of infrared touch screen?

• Touching screen breaks infrared beams.

• Microcontroller determines touch point.

• Sensors detect infrared radiation.

• Uses human skin to determine touch input

What are the disadvantages of infrared touch screen?

• Allows multi-touch facilities

• Has good screen durability

• Sometimes sensitive to light interference.

• The screen can be sensitive to water or moisture

What are the advantages of infrared touch screen?

• The operability isn’t affected by a scratched or cracked screen.

• It is possible for accidental activation to take place if the infrared beams are disturbed in some way

• Has good screen durability

• Sometimes sensitive to light interference.

Which touch screen uses infrared light to detect touch?

• Capacitive Touch Screen

• Infrared Touch Screen

• Resistive Touch Screen