Lesson Two: Install and Configure Display Devices Flashcards
What does LCD stand for and what does it do?
Liquid Crystal Display. Standard display type (monitor) for PCs and laptops. Liquid crystals change based on amount of voltage, creating different colors.
What does gamut mean?
Range of colors.
What does TFT mean and what are the two types?
Thin Film Transistor.
Twisted Nematic (TN): acceptable results and good response times; low response times make the image prone to motion blur and trails
In-Plane Switching (IPS): better color production and wide range of viewing angles; worse response times
What does VGA mean?
Video Graphics Array.
What does LED mean, and what are three types of it?
Light Emitting Diodes.
Edge Lit: arranged around the screen rather than behind it, diffuser used to make light even across the screen.
Backlit: arranged in an array behind the screen, makes the panel thicker but distributes light more evenly.
Color Temperature: uses backlight to generate either a white light (WLED) or combos of RGB/GB LEDs to make different color “temperatures”.
What does LED mean, and what are three types of it?
Light Emitting Diodes.
Edge Lit: arranged around the screen rather than behind it, diffuser used to make light even across the screen.
Backlit: arranged in an array behind the screen, makes the panel thicker but distributes light more evenly.
Color Temperature: uses backlight to generate either a white light (WLED) or combos of RGB/GB LEDs to make different color “temperatures”.
What does OLED mean and what is it used for?
Organic LED (Light Emitting Diodes).
Typically used in smaller screens (like smartphones). Does not require separate backlight (screen can be thinner). Can be made of plastic instead of glass. Used for curved/rolled displays.
Name four types of projector displays.
CRT/Cathode Ray Tube: legacy devices only.
LCD/Liquid Crystal Display: similar to LCD except it uses a lamp to project the image, much more powerful than a backlight.
DLP/Digital Light Processing: each pixel is represented by a mirror which is tilted to/away from the lamp to produce the desired color.
Laser: lampless projector, still uses LCD or DLP but with a laser instead. Can use one laser or three lasers (green, red, blue).
What are two types of VR headset?
Tethered: self contained headset which uses an HDMI port to connect to a PC. Has high requirements for compatibility. Oculus Rift is an example of one.
Mobile: designed to be used with specific phones, which provides the display.
What is native resolution?
The default resolution of a screen. You can adjust it lower but it will create a fuzzy/blurred image.
What is aspect ratio and what are common ones?
The width of the screen divided by the height. Usually they are 4:3 or 16:9 (widescreen). Widescreens are most common these days.
What is refresh rate?
In CRT devices this is the speed at which the image in redrawn on the screen, measured in Hz. If the speed goes below 70, you will see a noticeable flicker.
What is response rate?
The time it takes a pixel to change color, measured in ms. Best response rates are below 8, while 20+ results in ghosting or trails.
What is Luminance vs Illuminance?
Luminance is the term for PC/laptop displays. It is the perceived brightness of the screen, measured in candelas per square meter. Most TFTs are 200-300, although displays for home entertainment or gaming can be as high as 500.
Illuminance is the term used for projectors. It is the perceived brightness of the projected image, measured in lumens. For example, at 3000 lumens you could see the screen in a dimly lit room clearly, while at 6000 lumens you could see the screen in a bright room clearly.
What is contrast ratio?
Measure of luminance compared to black. High ratios (above 600:1) can display “true black” and better saturated/more intense colors.
