5.11 - Electrostatic Displays

Question 2

What do the anodes in a CRT monitor do

Answer 2

First and second anodes concentrate the electrons into a beam and the third anode focuses the beam onto the screen

Question 3

How is the beam projected in a CRT for large blocks of colour?

Answer 3

The electron beam is deflected onto the screen to give a raster

Question 4

How is the beam projected in a CRT for symbols and text?

Answer 4

Generated by stroke scan. The beam follows the shape of the symbols

Question 5

What happens as the temperature of the tube increases in a CRT?

Answer 5

Greater than 70’C - the raster is shut down and only the symbols remain.
Greater than 90’C - the whole monitor shuts down

Question 6

What are the CRT advantages

Answer 6

Coloured Multifunctional Displays

Question 7

What are the disadvantages of a CRT

Answer 7

1. A long shape
2. Heavy
3. Warming up required
4. High power consumption
5. Thermal sensitivity
6. Tend to burn in

Question 8

Led advantages

Answer 8

1. Small dimensions
2. Robust
3. Long lifetime

Question 9

LED disadvantages

Answer 9

1. Higher current consumption compared with LCD
2. Limited Flexibility

Question 10

What can a seven segment display be used for?

Answer 10

It can be used for numbers and a limited number of other symbols

Question 11

What light does a LCD emit ?

Answer 11

LCDs don’t emit and light. They only control light

Question 12

What are the LCD viewing modes

Answer 12

1. Reflective
2. Transmissive
3. Transflective

Question 13

What is reflected viewing mode

Answer 13

Reflective displays have an opaque rear polariser that includes a diffuser reflector, such as brushed aluminium. This display requires ambient light to be seen

Question 14

What is Transmissive Viewing Mode?

Answer 14

Transmissive displays have a clear polariser on the front and the back. This display requires light coming from the back to be seen

Question 15

What is transflective mode?

Answer 15

Transflective displays have a rear polariser that includes a translucent material which reflects part of the ambient light and transmitted backlighting

Question 16

What is an OLED

Answer 16

Organic Light Emitting Diode. The organic referring to the carbon film that sits inside the panel

Question 17

What are the OLED advantages over LCD

Answer 17

1. Screens are brighter
2. Screen can be read from the sides and above
3. Screens are thinner even flexible
4. Power consumption is much lower as no backlight

Question 18

What is the technical standard for HUD avionics

Answer 18

ARINC 764