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Question 1

What does laser printer do

Answer 1

Uses a static electric charge on a rotating drum (positive charge)
- remove positive charge in certain areas (match exactly the text/image)
- when the negatively charged paper rolled over the printing drum which is coated by positive charge toner
-> generates a physical output

Question 2

what does LCD projector do

Answer 2

uses a high intensity beam of light shone through 3 layers of changing pixels

Question 3

what does DLP projector do

Answer 3

uses millions of micro mirrors to reflect light that passes through a colour then passes through a lens -> shone picture on the wall

Question 4

what does inkjet printer do

Answer 4

• use piezoelectric technology -> produce a hard copy
• use hundreds of tiny guns to propel ink
• droplet comes out from the dispenser onto the paper

Question 5

what does 3D printer do

Answer 5

uses plastic, resin or powdered metal -> laser fuses it together and set out, layer by layer

Question 6

what does 2D cutter do

Answer 6

uses a high power laser to cut x y plane (3d cutter - xyz plane)

Question 7

How many display are there

Answer 7

4 displays
- DLP & LCD projector
- LCD & LED screen

Question 8

Benefit of OLEd display

Answer 8

• No backlight needed
• Lower power consumption
• Low running cost
• Greater field of view
• Thin and light

Question 9

Benefits of LCD display

Answer 9

• Cheap to manufacture
• Bright light
• Low heat production
• Energy saver
• Last longer

Question 10

Disadvantage of OLED display

Answer 10

• Higher production cost
• More vulnerable to water and contaminants
• Less life span than LCD

Question 11

Disadvantage of LCD display

Answer 11

• Limited viewing angle
• Uneven light intensity
• Pixels might malfunction