Mobile Devices - Mobile Device Displays & Components

Question 1

How do LCD displays work?

Answer 1

1. It produces images by allowing or blocking light to pass through
2. Liquid crystals rotate polarized light
3. A polarizing glass filter is placed in front of and behind the pixels which are turned on and off electronically

Question 2

What technologies do LCD screens use

Answer 2

1. Twisted nematic (TN)
2. Vertical alignment (VA)
3. In-plane switching (IPS)

Question 3

What is Twisted Nematic technology

Answer 3

TN technologies were used in early LCD. They use low operating voltages making their use with batteries possible. They are still used for monochrome alphanumeric displays.

Question 4

What is Vertical Alignment technology

Answer 4

VA was used in the early adoption of color LCD. It produces a truer black and offer a wider viewing angle. A downside is distortion when transitioning colors.

Question 5

What is In-Plane Switching technology

Answer 5

IPS has a high response rate. This is the technology used in LCD televisions and displays. It is the best choice for use on touchscreen displays.

Question 6

What is OLED technology?

Answer 6

Organic light-emitting diode.
Produces deep blacks and high contrast. Thinner and lighter than LCD, and can be flexible allowing for the development of foldable smart phones.

Question 7

What other components are often found within laptop displays?

Answer 7

WiFi antenna connector
Camera/Webcam
Microphone
Touch screen/digitizer
Inverter

Question 8

How are touch screens implemented into laptop displays?

Answer 8

Embedded into the display during manufacturing
A thin glass digitizer is placed in front of the display to read touch events.

Question 9

What is an inverter used for in a laptop display

Answer 9

LCD monitors are backlit. In order to produce a light bright enough, an inverter is included on the laptop’s motherboard or it may be part of the display. This converts DC power to AC and provides the required power for the screen