C04 - Display Devices Flashcards
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
C. LCDs do not have electron guns that are aimed by magnets as CRTs do. This difference
makes LCDs more compatible with nearby speaker magnets. Additionally, the
cathode ray tube for which CRT monitors are named is a rather bulky component,
requiring more desk space to accommodate the CRT’s cabinet. Projectors are not common
personal display devices; they are used more in group environments. HDMI is a
standard for connecting display devices, not a type of display device.
Which of the following have been common methods to backlight an LCD monitor? (Choose two.) A. RGB OLEDs B. LEDs C. Incandescent bulbs D. Halogen bulbs E. Fluorescent bulbs
B, E. Early LCD monitors featured one or more fluorescent bulbs that were used to
produce light that shone through the LCD panel. Modern LCD monitors have LED
panels to generate the light, the advantage being that there is now a separate LED for
each picture element instead of a common light source for the entire monitor.
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. The maximum allowable refresh rate does tend to be affected by the resolution
you choose in the operating system. The refresh rate is most often expressed in cycles
per second (Hz), not millions of cycles per second (MHz). You must usually select the
refresh rate that you want from the display settings dialogs, not through the monitor’s
built-in menu system, although the monitor can often tell you the refresh rate that you’re
using. Finally, both the monitor and adapter must agree on the refresh rate you select. If
either device does not support a particular refresh rate, such a rate cannot be used.
Which statement about LCD monitors is most accurate?
A. The concept of refresh rate has no meaning with regard to LCDs.
B. Those based on IPS technology suffer from color shifts when viewed from the edges.
C. Those based on TN technology are preferred by gamers.
D. The electric fields generate a magnetic field that eventually must be removed.
C. TN-based LCDs are less expensive and offer better response times for the money.
TN, not IPS, technology suffers from color shifts when viewed at wide angles.
If you are unable to display a given resolution on a monitor, which of the following might
explain why?
A. The graphics adapter does not have enough memory installed.
B. The video display unit does not have enough memory installed.
C. You are using an LCD with a single, fixed resolution.
D. You have the refresh rate set too high.
A. The amount of memory installed on a graphics adapter is directly related to how
many pixels can be displayed at one time and how many colors the pixels can be set to.
Monitors don’t have memory installed in them. LCDs, not CRTs, have a single, fixed
resolution called the native resolution. You might be limited to a particular refresh rate
because the resolution is too high, but the refresh rate is automatically adjusted down,
if necessary, when you select a resolution.
Which video technology has a resolution of 1280×1024? A. SVGA B. SXGA C. WSXGA D. UXGA
B. SXGA has a resolution of 1280 × 1024. Consult Table 4.2 for the resolutions that
characterize other technologies.
What does a Q in video resolution names, such as QXGA, refer to?
A. Both the horizontal and vertical components of the resolution have been quadrupled.
B. The resolution is cut to one‐fourth.
C. The technology is faster.
D. Both the horizontal and vertical components of the resolution have been doubled.
D. Although the Q stands for quad, the pixel count for each axis is only doubled,
resulting in four times as many total pixels.
What is contrast ratio?
A. The ratio of luminance between the darkest and lightest colors that can be displayed
B. A term that was used with CRTs but has no meaning with LCDs
C. The ratio of luminance between two adjacent pixels
D. Something that can be corrected through degaussing
A. Contrast ratio is a selling point for LCDs. Higher contrast ratios mean darker
blacks and brighter whites. The measure of luminance between adjacent pixels is
known as contrast, not contrast ratio.
Which of the following display types physically creates the image displayed in a manner most similar to OLED displays? A. Fluorescent‐based LCD B. LED‐based LCD C. IPS‐based LCD D. Plasma
D. Both OLED and plasma displays use electrodes to excite the material in a sealed
chamber to produce light. Each in its own way uses that light to create red, green, or
blue light within individual subpixels. All LCD panels form images that require an
external light source to view.
When approaching an older LCD panel from the side, you don’t realize there is actually an
image displayed on it until you are almost in front of it. Which options might explain why
you could not detect the image from the side? (Choose two.)
A. Older LCDs were equipped with a motion sensor.
B. Multiple monitors are in use, and the LCD is the secondary monitor, resulting in its
poor oblique visibility.
C. The user has a privacy filter in place.
D. The monitor employs active‐matrix pixel addressing.
E. It is a passive‐matrix LCD panel.
C, E. Older LCD panels might have employed passive-matrix addressing for their
pixels,
resulting in a poorer viewing angle than that created by active-matrix LCD
panels. Additionally, privacy filters intentionally limit the angle of screen visibility by
changing the light’s polarization when viewed from the side. Antiglare filters might
unintentionally do the same thing.
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
B. Although it’s true that you must start with the Display Settings dialog box, which
ironically shows a single tab labeled Monitor, and that you subsequently click the
Advanced Settings button, the Monitor properties tab is where you select the refresh
rate. The Adapter tab in those same properties pages has no selection for refresh rate.
When you’re in a hurry to pack everything up and head to the airport after a presentation
using a video projector, which of the following should you avoid doing immediately?
A. Unplugging the projector’s power cable
B. Unplugging the projector’s video cable from your laptop
C. Powering down the projector
D. Turning off your laptop
A. Unplugging the power to the projector before the projector’s fan has had the opportunity
to cool the unit and stop running on its own can lead to expensive repairs on the
projector or to the cost of replacing the projector outright.
What might cause your display to appear in a resolution of 640×480?
A. You have your resolution set to SVGA.
B. You added memory to your graphics adapter but have not informed the BIOS of the
new memory.
C. You have your resolution set to XGA.
D. You have booted into Safe Mode.
D. Safe Mode disables as many nonessential drivers and services as possible. One of
the nonessential drivers it disables is the driver for the graphics adapter. Windows uses
its standard VGA driver to control the graphics adapter while you are in Safe Mode.
Another reason for defaulting back to standard VGA is that you might have a corrupt
or incorrect driver for your adapter
Which of the following results can occur with improper display settings?
A. The computer spontaneously reboots.
B. The graphics adapter automatically chooses to use the highest supported resolution.
C. You might have to scroll to see parts of the Desktop.
D. The mouse cursor changes or permanently disappears.
C. If your monitor allows you to change the resolution, it might not actually allow you
to change the resolution. As confusing as that sounds, your monitor might maintain
its optimal hardware resolution, such as an LCD’s native resolution, and force you to
scroll to see any pixels created by the chosen software resolution that it cannot fit on
the hardware screen at that particular moment.
What is the single, fixed resolution of an LCD called? A. Native resolution B. Default resolution C. Refresh rate D. Burned‐in resolution
A. An LCD’s native resolution is the single, fixed resolution that provides optimal
clarity
