CS Unit 4 T4 DLP projectors

DLP projectors

By Michael Harrington

Level C/B:

• Understand what is meant by an output device

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Level B/A:

Understand each of the following output devices and why they are required

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• Liquid crystal display (LCD) screens

• Digital light processing (DLP) projectors

• Actuators

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​Objectives

By Michael Harrington

Open Ended

Explain one thing you learnt from the previous video?

Multiple Select

Which is correct about digital light processing projectors ?

[2 correct only]

• If they are tilted away from the light source, they are in the twilight zone

• When these micro-mirrors are tilted towards the light source, they are in the ‘on’ status

• The micro-mirrors can switch between ‘on’ and ‘off’ thousands of times a second creating different and changing shades of grey light

• DLP projectors use a grid of mirrors that can each produce less than 10 shades of grey

Multiple Select

Which is correct about LCD projectors ?

[3 are correct]

• The white light is sent to Dichroic mirrors and the light is reflected back with red, green or blue wave lengths

• The three coloured light components pass through three LCD screens containing the image from the computer to be deleted

• The three coloured light components pass through three LCD screens containing the image from the computer to be projected

• The three images are then combined using a prism to produce the full colour image which then passes through a lens and is projected on to a screen

• The three images are then combined using a magic wand to produce the full colour image which then passes through a lens and is projected on to a screen