Chapter 4: Display Devices
What is refresh rate?
# of times a screen is redrawn/refreshed per second. Refresh rate of 60 Hz= 60 times refreshed per second.
Which of the following resolutions is an example of 16:10 aspect ratio? A. 1280 x 1024 B. 1920 x 1200 C. 800 x 600 D. 2048 x 1536
1920 x 1200
What are the three most common aspect ratios?
4:3, 16:9 and 16:10
Name 4 common refresh rates
60 Hz, 120 Hz, 240 Hz, 480 Hz (doubled every time)
What is Super VGA resolution?
800 x 600
What is a projector?
A VDU (video display unit) with a lighting system that projects an image onto a screen or flat surface for GROUP viewing
Which one has better overall quality: AMOLED or PMOLED?
AMOLED
OLEd panels can be classified as ___LED & ____LED
AMOLED (active matrix OLED) and PMOLED (passive matrix OLED)
What are the main differences between active matrix and passive matrix screens?
Active matrix screens are made up of independent pixels. There's a transistor at each LCD pixel location. A passive matrix display does not have a dedicated transistor for each pixel, so instead it uses a matrix of x-y coordinates to turn a specific pixel on.
____ filters brighten and clarify the image of the screen and allow for better viewing in front of sunlight.
Anti-glare
______ is the ratio between horizontal and vertical pixels
Aspect ratio
Most backlights use ____ technology and are only found in old LCD's
CCFL (Cold Cathode Fluorescent Lamps) Used due to its low power consumption and long life span. Backlights are used in old LCD's
Display adapters are divided into 5 primary groups
CGA, EGA, VGA, DVI, HDMI
What does CRT mean?
Cathode Ray Tube
Which of the following is true regarding a monitor's refresh rate? A. As long as the graphics adapter can refresh the image at a particular rate, the attached monitor can accommodate that refresh rate B. The refresh rate is normally expressed in MHz C. The refresh rate is normally selected by using the controls on the front panel of the monitor D. As you lower the resolution, the maximum refresh rate allowed tends to increase
D. Both the graphics adapter and the monitor have to agree on the refresh rate
_____ ports were designed to replace VGA ports
DVI DVI-A - analog only DVI-D - digital only DVI-I - both
Analog LCD displays uses which two kinds of connectors?
DVI-I and VGA (DVI-I = Digital Visual Interface - Integrated; supports both digital and analog video)
What does DLP stand for?
Digital Light Processing
What is the function of dual-scan displays?
Dual scan displays refresh half the screen separately so it increases the quality of passive-screen displays.
____ is a variation of passive matrix displays.
Dual-scan
True or False: Plasma displays require a backlight
False
TN is preferred by gamers because of its faster ____ rates.
Faster response rates
Digital output on LCD displays is supported by which two kinds of connectors?
HDMI (High Def Media Interface) & DVI-D (D=digital)
Which requires more power to operate: IPS or TN?
IPS
_____ reproduces color more accurately and does not suffer from the shifts in color when the screen is viewed from wide angles.
IPS
What does a Q in front of a resolution name such as QXGA refer to?
It means quad, but the resolution has been DOUBLED
What is a disadvantage of an active matrix LCD screen?
It requires a lot of power to operate every transistor so it drains your battery really quickly
What are the 4 main types of VDU's?
LCD, Plasma, OLED, Projectors
Which of the following would be the best choice as a personal display technology if a user wants to save desk space and not have to deal with interference from nearby speakers? A. CRT B. HDMI C. LCD D. Projector
LCD. Projectors are for group viewing, CRt's are too big and HDMI is an adapter not a display
Which of the following have been common methods to backlight an LCD monitor? RGB OLED LED's incandescent bulbs halogen bulbs fluorescent bulbs
LED and fluorescent bulbs
What kind of power does an LED display operate on & how does it make it different from LCD's?
LED's operate on DC current like the rest of the laptop, so they don't require an inverter.
What is an LED display?
Light Emitting Diodes LED's are just an LCD display that use LED's as the primary light source instead of fluorescent bulbs.
What does LCD mean?
Liquid Crystal Display
On which properties tab do you select the refresh rate to use between the graphics adapter and monitor in windows vista? A. Adapter B. Monitor C. Advanced D. Display settings
Monitor
Do OLED's use backlight?
No.
Which has a higher contrast ratio: LCD, OLED, LED, Plasma
OLED
What is an OLED display?
Organic Light Emitting Diode Uses a layer of organic compound to emit light. This layer resides between two electrodes
What kind of matrix display type is known for making it look like the screen has a privacy filter on?
Passive-matrix
OLED displays most resemble what other types of displays?
Plasma
What does PDP mean?
Plasma Display Panels
What are the two major types of projectors?
Rearview (most common) Frontview (requires a darker environment)
Which video technology has a resolution of 1280x1024
SXGA
Describe the SXGA adapter
Supports 1,400 by 1,050 resolution Super Extended Graphics Adapter (projectors normally use this resolution)
Describe the VGA adapter
Supports a resolution that uses analog and supports 320 x 200 resolution (im!)
What are the two most popular methods of manufacturing LCD panels?
TN (Twisted Nematic) & IPS (In-Plane Switching)
What are the main differences between TN and IPS?
TN is faster and cheaper. IPS has the best color representation in all angles but is more expensive.
What is a disadvantage of a passive matrix LCD screen?
The angles of visibility and response times suffer greatly. Neighboring pixels can be affected and make the picture look "muddy"
What is frame rate?
The measure of frames/ how many unique screens of content were recorded per second.
What is resolution?
The number of horizontal and vertical pixels used
T or F Increasing the resolution beyond the native resolution can result in the need to scroll in order to see your full desktop.
True
T or F Never pull the plug off a projector until you hear the fan turn off
True
True or False: LCD displays are available as both analog and digital
True
What does VDU stand for?
Video Display Unit
What does VDU mean?
Visual Display Unit
What causes the "Soap Opera Effect" in an LCD display?
When an LCD has a high refresh rate and motion smoothing
What are the two major types of LCD displays?
active matrix and passive matrix
Dual view gives you the option of ____ or ____ your desktop onto a second monitor
cloning; extending
The _____ is the measure of the luminance of the brightest color to that of the darkest color
contrast ratio
Microsoft calls its multi-monitor feature _____
dual view
Contrast ratios are _____ measurements
fixed
The refresh rate in an LCD is usually _____
fixed
____ rate must match ____ rate
frame ; refresh
Describe the XGA adapter
is a 1,024 x 768 resolution adapter
____ generate the light inside projectors. Since they generate so much heat, all projectors come with a ____ to keep from overheating.
lamps; fan
The brightness of a projector is measured in ___
lumen
The refresh rate must be supported by which two components?
monitor and graphics adapter
What was the first video technology for PC's?
monochrome
Fixed resolution is known as _____ resolution
native
LCD, plasma, OLED, and all flat panel displays all have a ____ resolution
native. Flat-panel monitors have trouble displaying other resolutions other than their native resolutions
Submarining frequently happens in what kind of displays?
passive matrix/dual scan displays
A ______ filter fits over the front display and limits the viewing angle of the monitor.
privacy filter
If you want a higher refresh rate, you might have to compromise by choosing a lower _____
resolution
What are plasma's made from?
small cells containing ionized gases
When a screen responds poorly to rapid changes, it's called ____
submarining
A projector ___ is the size of the image at a certain distance form the screen.
throw
