1.2 - Laptop Displays

Question 1

• TN (Twisted Nematic) LCD

Answer 1

– The original LCD technology
– Fast response times (gaming!)
– Poor viewing angles - color shifts

Question 2

• IPS (In Plane Switching) LCD

Answer 2

– Excellent color representation
– More expensive to produce than TN

Question 3

• VA (Vertical Alignment) LCD

Answer 3

– A good compromise between TN and IPS
– Good color representation
– Slower response times than TN

Question 4

OLED

Answer 4

Organic Light Emitting Diode
– Organic compound emits light when
receiving an electric current
* Thinner and lighter
– Flexible and mobile - no glass needed
* No backlight
– The organic compound provides the light
* Tablets, phones, smart watches
– Very accurate color representation
– A bit higher cost than LCD

Question 5

Wi-Fi antennas

Answer 5

• Multiple antennas
  – WiFi main and aux / Bluetooth
• Antenna wires wrap around the laptop screen
  – It’s up high!

Question 6

Webcam

Answer 6

• Video capture - Built-in camera and microphone
• Usually includes both audio and video
  – Specialized drivers and software

Question 7

Microphone

Answer 7

Built-in to the laptop display
– Useful for video calls
Not good for non-casual use
– Analog or USB microphones can help

Question 8

LED-backlit LCD display

Answer 8

– Backlight is LEDs instead of florescent
– LEDs around the edge of the screen
– An array of LEDs behind the screen
– The latest laptops are LED-backlit

Question 9

CCFL - Cold Cathode

Answer 9

– Fluorescent Lamp
– Higher voltage and power needed
– Added thickness to the display
– No longer a common backlight
– Older laptops will use these

Question 10

Backlight and inverter

Answer 10

• LCD displays need a backlight
  – Florescent lamp/LED to LCD display to your eyes
• Some laptops have inverters - Turn DC into AC
• Verify backlight
  – Look closely and use a flashlight
• May need to replace the LCD inverter or display
  – Choose carefully

Question 11

Digitizer

Answer 11

• Use a pen-like device as input
  – Stylus input - Useful for graphical input
• Used commonly on laptop / tablets
  – Or hybrid devices

Question 12

Touchscreen

Answer 12

• Merge laptop and tablet input
  – Digitizer responds to touch - No keyboard required
• But often still available
  – Many options for input - Use the best one for the job