Laptop Display Flashcards
What type of display do laptops have nowadays?
Describe how it works.
Liquid Crystal Display (LCD)
Screen has multiple color filters via crystal display with a light source that shines through all filters from the back.
Advantages and disadvantages of LCD display on a laptop.
Adv
-lightweight
-cheaper to make
-low power
Disadv
-true black on display is difficult since light shines through from the back of the LCD
-diff kind of light source in the back (older has fluorescent, newer has LED
What are 3 different types of LCD technologies?
List an advantage and disadvantage of each.
Twisted Nematic (TN LCD)
-fast response times so good for gaming and fast moving graphics
-poor viewing angles so have to view directly in front
In Plane Switching (IPS LCD)
-best color representation
-more costly to produce than TN
Vertical Alignment (VA LCD)
-compromise between TN and IPS so good color representation but
-slower response times than TN
What is OLED?
Describe construction of display and effect of it.
What devices typically have OLED?
organic light emitting diode
does not have a backlight, instead organic material emits light when provided with a current;
no backlight and no crystals means the display is very thin and light and no glass needed in front to protect the display
smart devices, tablets, phones
When you open your laptop, what is the highest component in the system?
What’s usually found there?
display
wireless antennas (for 802.11 and bluetooth connections, etc)
What are some challenges when replacing a display?
antenna wires wrap around the display so when you replace it you have to remember to connect video components and antenna wires (for wireless connectivity ports, etc)
What is CCFL and what is the difference between the former and LED backlighting?
Cold Cathode Fluorescent Lamp
CCFL
-type of backlight generally in older laptops
-thicker and requires more power
LED backlighting
-actually LED-backlit LCD display
-LED lights arranged in a matrix or the edges of screen are used to provide light for the LCD
What is an inverter and where is it found?
Inverter is used to convert DC power to AC power to supply charge to the CCFL bulbs in the back of the display commonly found in older laptops.
In a repair, how would you check to see if the laptops inverter is functioning properly?
Shine a flashlight at the screen. If you can make out some words/images on the screen, it means most likely the backlight failed.
Describe what a digitizer does and what type of laptops its typically found in.
a digitizer is used to translate analog input onto the display into digital signals the computer can use; can either read stylus input or touch input (touch screen digitizer)
typically found in laptops with a keyboard and stylus component (like an iPad or Surface Pro)
