3. Hardware - Input & Output Devices: Computer Science CIE IGCSE

What are LED screens made of?

• A matrix of blue/white LEDs

• Tiny R/G/B LEDs

• Liquid crystals

How can LED brightness be controlled?

• By varying the amount it is switched off vs switched on

• By varying the current sent to it

• By varying the voltage

• It can't

What does OLED stand for?

• Organic liquid crystal display

• Organic light emitting diode

• Original liquid Entity Dimention

Which screen can be bent into any shape?

• LED screens

• OLED screens

• LCD screens

What are OLEDs made of?

• Carbon compounds

• flexible semiconductor

• Metallic cathode

• Glass anode

What do OLEDs create?

• Carbon compounds

• flexible semiconductor

• Metallic cathode

• Glass anode

What are advantages of OLED screens?

• Thin

• Light

• Flexible

• Require backlighting

• Easy to make

What are advantages of OLED screens?

• Can be plastic rather than glass

• Brighter

• Require no backlighting

• High power

• Cheap

What are advantages of OLED screens?

• Low power

• Can be made into large, thin sheets

• Large field of view

• Quieter

• Better for user's eyes

Sensors are...

• Input devices

• Output devices