1.2 Laptop Displays Flashcards
What does LCD stand for?
Liquid Crystal Display (light shines through the crystals)
What are 3 advantages of portable LCD displays?
- Lightweight
- Low power
- Inexpensive
What are 3 disadvantages of portable LCD displays?
- Black levels are a challenge
- Requires a separate backlight (florescent, LED, etc)
- Lights are difficult to replace
What are the 3 LCD technologies?
- Twisted Nematic (TN) LCD
- In-Plane Switching LCD
- Vertical Alignment (VA) LCD
Which is the original LCD technology?
Twisted Nematic
What LCD technology has fast response times but poor viewing angles?
Twisted Nematic
Which LCD technology has excellent color representation but is more expensive to produce?
In-Plane Switching (IPS) compared to TN
Which LCD technology has good color representation but slower response times?
VA (compared to TN)
The latest laptops use what kind of backlight?
LED backlighting
LED backlighting is found where inside a laptop?
around the edge of the screen, and an array behind the screen
What are the 2 types of LCD backlighting?
Fluorescent and LED
What is fluorescent backlighting called?
CCFL (Cold Cathode Fluorescent Lamp)
What are the negatives to using CCFL backlighting? (2)
- Higher voltage and power needed
- Added thickness to the display
(why it’s no longer common)
Some laptops have inverters. What do these do?
turn DC power into AC power
How would you verify if the backlight is the culprit when troubleshooting a dim screen?
Use a flashlight and look closely
