Laptop Displays

Question 1

Portable LCD

Answer 1

• Liquid Crystal Display
  
  • Light shines through liquid crystal
• Advantage : Lightweight , low power , inexpensive
• Disadvantages : Black levels are a challenge, requires separate backlight , difficult to replace fluorescent , LED

Question 2

TN VS IPS

Answer 2

• TN (Twisted Nematic) LCD - Most common
  
  • Fast response (gamers)
  • Low power draw
  • Poor viewing angles
• IPS (In Plane Switching) - LCD
  
  • Excellent color representation
  • No tailing when touched (mobile devices)
  • More expensive

-Laptops can have both

Question 3

Fluorescent vs. LED Backlighting

Answer 3

• CCFL - (Cold Cathode Fluorescent Lamp)
  
  • Higher voltage & power needed
  • Added thickness to display
  • No longer common
• LED - Backlit LCD display
  
  • LED instead of Fluorescent
  • LEDs around the edge of the screen
  • An array of LEDs behind the screen

Question 4

OLED

Answer 4

• Organic Light Emitting Diode
  
  • Organic compound emits light with electronic current
• Thinner & lighter
  
  • Flexible & mobile - No glass needed

-No backlight necessary (organic compound provides light)

• Not ready for laptops
  
  • Images can remain on screen

Question 5

Wifi Antennas

Answer 5

• Multiple antennas
  
  • Wifi main & Aux
  • Bluetooth

-Antenna wires wrap around laptop display (internally)

Question 6

Backlight & Inverter

Answer 6

-LCD display need a backlight
Fluorescent lamp to LCD display to your eyes

• Some laptops have inverters
  
  • Converts DC current into AC current
• Verify backlight
• May need to replace the LCD inverter or display

Question 7

Digitizer

Answer 7

• Use a pen-like device as input
  
  • Useful for graphical input

-Becoming more common on laptops / tablets