lesson 7 display devices Flashcards
what are the video display types?
LCD,LED Monitors, OLED,
Plasma, Projectors
what is LCD?
consists of two sheets of polarizing material surrounding a layer of liquid crystal solution.
what are 2 types of important active matrix LCD technologies?
Twisted nematic (TN), In-plane switching (IPS)
what is Twisted nematic (TN)?
Uses liquid crystals that
actually twist and untwist at different angles, letting certain amounts of light through. Less expensive LCD monitors will used TN technology
what is In-plane switching (IPS)
Aligns the liquid crystals on a plane that is parallel to the glass - Uses an additional transistor for each picture
element.
what do LCD Displays use ?
LCD Displays use Cold Cathode Fluorescent
Lamp as the lighting source
what kind of diodes do LED monitors use?
light-emitting diodes, Organic light-emitting diodes
what 2 different types of technologies do LED use?
Surface-mounted device (SMD) technology
Discrete LED technology
what is Surface-mounted device (SMD) technology?
More common
for LED monitors; it uses red, green, and blue diodes
that are mounted as individual triads
what is Discrete LED technology?
Clusters the triades together
into pixels
How does plasma work?
Use small cells that contain electrically
charged ionized gases; Basically they are fluorescent lamps
what is Light output measured in?
Lumens
what are projectors available in?
LCD, LED, and DLP (Digital
Light Processing) versions
what is bit depth?
number of bits
that represent colour
What is 1 bit colour?
a binary number
with one digit.
what is display resolution?
the number of
pixels (picture elements) on
a screen
what is Aspect ratio ?
an image’s width divided by its height
what are the pixel dimensions and the aspect ratio of high definition ready?
1366x768, 16:9
what does WSXGA+ (HD) stand for?
Widescreen Super
eXtended Graphics Array
Plus (High Definition)
what are the pixel dimensions and the aspect ratio of WSXGA+ (HD)
1680x945, 16:9
what does WUXGA stand for?
Widescreen Ultra
eXtended Graphics Array
what are the pixel dimensions and the aspect ratio of WUXGA?
1920x1200, 8:5
what is HD 1080p & 1080i?
Full High Definition
what are the pixel dimensions and the aspect ratio of HD 1080p & 1080i?
1920x1080 ,16:9
what is QHD (WQHD) 1440p ?
Quad High Definition
what are the pixel dimensions and the aspect ratio of QHD (WQHD) 1440p
2560x1440, 16:9
what is UHD 4K?
Ultra High Definition
what are the pixel dimensions and the aspect ratio of UHD 4K?
3820x2160, 16:9
what is Refresh rate?
number of times a display is “painted” per second
what is OSD ?
On Screen Display can
help configure picture quality
what problems does OSD solve?
distortion, picture size, centering,
contrast and brightness
how do you access OSD?
pressing a button below the display or on one of the sides. From there use arrows
to make modifications.
what is the first step in solving monitor issues?
Check Connections
what is the second step in solving monitor issues?
Power cycle the computer, display, and any power protection equipment
what is the third step in solving monitor issues?
Check for an onboard video setting in the UEFI/BIOS
what is the fourth step in solving monitor issues?
Resolution settings
what is the fifth step in solving monitor issues?
Check the driver
what is the sixth step in solving monitor issues?
Check the version of DirectX
what is the seventh step in solving monitor issues?
Check the temperature threshold of the video card
what is the eighth step in solving monitor issues?
Use software to check and repair stuck or dead pixels
what is the ninth step in solving monitor issues?
Calibrate the monitor
what is the tenth step in solving monitor issues?
Use a filter on the monitor
what is the eleventh step in solving monitor issues?
Check for newly installed applications
what is the twelveth step in solving monitor issues?
Check inside the computer
