1.2 Laptop Displays

Question 1

Portable LCD

Answer 1

Liquid crystal display
-Light shines through liquid crystals
Advantages:
- lightweight
-low power
inexpensive
Disadvantages:
-Black levels are a challenge
-requires separate backlight
-lights are difficult to replace

Question 2

LCD technologies
TN?
IPS?
VA?

Answer 2

TN (twisted nematic LCD)
-original LCD tech
-fast response times
-poor viewing angles - colour shifts

IPS (in plane switching) LCD
-excellent colour representation
more expensive to produce than TN

VA (vertical alignment) LCD
-a good comparison between TN and IPS
-good colour representation
-slower response times than TN

Question 3

OLED?

Answer 3

Organic Light Emitting Diode (OLED)
-organic compound emits light when receiving an electric current
-Thinner and lighter
-No backlight (organic compound provides the light)
-Tablets, phones, smart watches
- very accurate colour representation
- a bit higher cost than LCD

Question 4

Wi-Fi antennas

Answer 4

Multiple antennas
-Wi-Fi main and aux
-Bluetooth

Antenna wires wrap around laptop screen

Question 5

Webcam

Answer 5

Video capture
- built in camera and microphone

Usually includes both audio and video
-specialised drivers and software

Question 6

Microphone

Answer 6

Built-in to laptop display
-useful for video calls
-not good for non-casual use
- analog or USB microphones can help

Question 7

Fluorescent vs LED backlighting

Answer 7

CCFL - Cold Cathode Fluorescent Lamp
-Higher voltage and power needed
-added thickness to the display
-no longer a common backlight
-older laptops will use these

LED-backlit LCD display
-backlight is LEDs instead of florescent
-LEDs around the edge of the screen
-An arrau of LEDs behind the screen
-the latest laptops are LED-backlit

Question 8

Backlight and inverter

Answer 8

LCD displays need a backlight
-florescent lamp/LED to LCD displays to your eyes

Some laptops have inverters
-turn dc into ac

verify backlight
-look closely
-use a flashlight

may need to replace the LCD inverter or display
-choose carefully

Question 9

Digitizer

Answer 9

use a pen-like device as input
-stylus input
-useful for graphical input

used commonly on tablets/laptops or hybrid devices

Question 10

Touchscreen

Answer 10

Merge laptop and tablet input
-digitizer responds to touch
-no keyboard required (but often still available)

Many options for input