Computing KS3/4: How LED screens work

Professor Danielle George explains how an LED screen works, using a 32 x 32 LED grid to demonstrate how each LED acts as a pixel in an image.

Danielle invites a child from the audience to join her in a demonstration in which she uses a 4 x 4 grid of giant LEDs to show that a large number of LEDs can be controlled by a small number of switches.

This clip is from The Royal Institute Christmas Lectures 2014.

Teacher Notes

Key Stage 3:

Could be used to help students understand how digital displays work.

Provide pupils with card that is black on one side and white on the other. How many cards (pixels) do they need to represent a letter from their name, their whole name and a picture of their face?

Key Stage 4:

Could be used to help children understand how displays work including pixels.

Could also be used to demonstrate the compromise between image quality and size.

Curriculum Notes

These clips will be relevant for teaching Computing, ICT and Computer Science at KS3 and GCSE/KS4 in England, Wales and Northern Ireland and 2nd Level and National 4/5 in Scotland.

The topics discussed will support OCR, Edexcel, AQA,WJEC GCSE in GCSE in England and Wales, CCEA GCSE in Northern Ireland and SQA National 4/5 in Scotland.

More from The Royal Institute Christmas Lectures 2014:

Feedback loops
How does a digital camera work?
How robots can work together in a swarm
The Mars Rover and autonomous navigation
Solving a Rubik's cube by smartphone
What can 3D printing be used for?
Touching virtual objects