Product guide
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Lens Shift The purpose of “lens shift” is to eliminate
keystone correction and provide greater exibility in the
placement of the projector relative to the screen or the
alignment of stacked projectors. This is accomplished by
allowing the optical lens to be physically shifted vertically
and/or horizontally. These adjustments may be manual or
motorized depending on the projector. See horizontal lens
shift and vertical lens shift for typical adjustment ranges.
Letterbox A method of preserving the originally aspect
ratio of a production when presented on a projector with a
different aspect ratio. This is accomplished by showing the
full image and black where no image exists.
Lock-It™ Security Hardware Special security
screws and barrels designed to deter removal of at-panels
or projectors. The screws can only be installed or removed
using the security allen wrench usually included in the
hardware pack.
Long Throw Lens Allows greater distance between the
projector and the screen while being able to maintain the
image size and brightness of a shorter throw lens for any
given projector. Depending on the room, a long throw lens
may be required due to mounting constraints nearer the
projected image.
Loopthrough An output on a projector allowing you
to connect other monitors or projectors to display the
same image. It is commonly used when presenting, so the
speaker is able to look at a computer monitor in front of
them while at the same time the image is being projected
onto another screen thus allowing the person to always face
the audience.
Lossless Compression The process of compressing
data in which information is arranged more concisely and
restored to its original state upon decompression.
Lumen A measurement unit of total illumination. Typically
a 100-watt light bulb outputs 1700 lumens over a wide area.
Projector light output is measured in ANSI lumens. A pro-
jector with a higher lumen number will produce a brighter
image for a given image size. See ANSI Lumens.
Luminance The black and white part of a video signal.
It is signied by the letter Y. Signals with a separated lumi-
nance and color signal avoid interference. This interference
can result in dot crawl among other image artifacts.
Lux A unit of measure of incident light (not reected from
the scene). The lux rating of a camera is usually, loosely
used to determine if the camera is capable of producing an
image in low light situations. The lower the lux specica-
tions, the lower the required light level needed to produce
an image. Generally, the lux rating of a camera is listed in
the specications as “Minimum Illumination”. The Minimum
Illumination specication lists the lux rating as well as the f/
Stop and gain settings needed to achieve the lowest lux
possible on that particular camera.
M
MAC Address (Media Access Control Address).
A hard-coded interface identication used by layer
2 devices (switch or bridge) for proper forwarding
of frames between computers on a network.
Marquee A permanent roof-like structure or canopy of
rigid materials supported by and extending from the facade
of a building frequently used to display signage. (2) On the
World Wide Web, the term marquee is often used to de-
scribe scrolling text effects created with the HTML marquee
tag (Microsoft Internet Explorer-specic), Flash, JavaScript,
and Java Applets.
Maximum Distance Sometimes used to refer to the
distance from the screen that a projector can focus the
image. Most of the time, it is the manufacturer’s opinion of
how far from a screen the projector can be to cast an image
that is useable (bright enough) in a fully darkened room.
Consult the Projection Calculator for guidance on proper
placement of a projector for a given screen and content.
Maximum Image Size The largest image a projector
can reasonable throw in a darkened room. Consult the
Projection Calculator for guidance on proper placement of a
projector for a given screen and content.
Maximum Resolution Maximum Resolution refers to
the highest resolution that a given display device can sup-
port. If the Maximum Resolution exceeds the Native Reso-
lution, the image is usually scaled to match or approximate
the Native Resolution of the projector. Some display devices
allow pan and scan where rather than scaling the image,
the display devices allows you to use the native resolution of
the display to view portions of the higher resolution image.
Scaling reduces the image resolution and produces some
artifacts in the image that are more apparent when viewing
text than graphics or video.
MHz The abbreviation for megahertz, or millions of cycles
per second.
Microperforated Screen A screen which can have a
speaker mounted to the rear of it.
Minimum Display The closest position that a projector
can focus an image onto a screen.
Multi-Lamp Some projectors use multiple lamps that
can be controlled by the user to increase or decrease the
brightness of the image. This lamp redundancy signicantly
minimizes the risk of total lamp failure during use. Another
type of multi-lamp system is a Dual Lamp. With a dual lamp
projector one lamp can serve as a backup to the other lamp
in the event of failure or the lamps can be programmed to
switch at specic intervals.
N
Native Aspect Ratio Nearly every projector or
display today will support multiple aspect ratios;
however, each manufacturer must decide who
their intended audience is and optimize the projector for
that audience. This means each device has a native aspect
ratio that is optimized for specic viewing material. Images
shown in native aspect ratio will utilize the entire resolution
of the display and achieve maximum brightness. Images
shown in other than native aspect ratio will always have less
resolution and less brightness than images shown in native
aspect ratio.
Native Resolution Native Resolution is the number of
physical pixels in a display device. For example, an XGA
display has a native resolution of 1024 physical pixels of
resolution horizontally and 768 pixels vertically or 786,432
total pixels. See Maximum Resolution.
Negative Gain Screen A screen with a gain rating of
under 1 which actually reduces the amount of light reected
back from a projected image. Usually gray, they are used to
increase apparent contrast by lowering the black level.
Noise An unwanted random signal.
Non-Interlace Also known as progressive scan. De-
scribes how video frames are drawn which, in this case, is
completely from top to bottom at every screen update. See
Interlaced.
NTSC (National Television Standards Committee). Estab-
lished the rst color TV standard in 1953 and is the North
American standard for video and broadcasting. Also used
in the Caribbean, South Korea, Japan and South America.
A 30 fps signal with 525 lines of resolution of which 480 to
483 are viewable. Transmitted via a 6MHz channel.
O
OEM (Original Equipment Manufacturer). A
company that gathers components from other
manufacturers and sells under their own name. An
OEM version of a product is supported by the seller, not the
actual manufacturer.
OLED (Organic Light Emitting Diode). A self-illuminating,
energy-efcient, direct-view imaging system. Uses an
organic lm sandwiched between 2 transparent electrodes.
Optical Digital Cable Transfers digital signals as light
pulses. Also called ber-optic cable and is commonly used
to send surround sound from a player to a receiver/decoder.
Optional Lenses Typically the less expensive projectors
come with a built-in lens that is designed to serve a specic
type of setting or application. A projector that supports
optional lenses can address a wide variety of installation
needs. This gives a projector great exibility at an incremen-
tal cost.
OptiSync Digital/Analog Inputs ViewSonic expands
your connectivity with multi-mode input technology that
supports both digital (DVI) and analog (VGA) signals for
ultimate compatibility and conguration exibility.
OSD (On Screen Display). The menu that enables the user
to access and adjust a monitor’s settings, including bright-
ness, image position, and color saturation.
OSHA An agency of the United States Department of La-
bor. Its mission is to prevent work-related injuries, illnesses
and occupational fatalities by issuing and enforcing rules
called standards for workplace safety and health.
OSHPD California State Department that assures the
safety of buildings used in providing health care. OSHPD
certication is also known as seismic or earthquake safe up
to an earthquake of magnitude greater than or equal to 6.5.
This includes establishing building standards that govern
construction of, or changes to, these types of facilities.
OSHPD also observes construction in progress to ensure
compliance with the approved plans and specications.
Products that are OSHPD approved also comply with DSA
requirements for seismic safety.
Overhead Projector A type of projector which pro-
duces an image on screen by transmitting light through
a transparent piece of clear plastic or acetate cell. The
transparent sheet with a graph or photo is placed on large
lens with a light source underneath. This focuses the image
into a lens which projects the image onto a screen. These
projectors have been replaced by document cameras.
Oversampling Multiplies outgoing signal samples in
order to more easily lter out aliased sounds but doesn’t
create delity that isn’t there to begin with.
Overscan Given as a percentage or pixel count, the
amount that a particular display device crops the edges of
an incoming video signal. This is done to ensure the image
area contains only picture information.
P
P.O.P. (Point-of-purchase) The term point-of-
purchase usually refers to the industry concerned
with customer behavior at the location of the
purchase decision. POP is considered one of the most
important aspects of advertising and merchandising. It is
believed that the most critical time to inuence buyer
behavior is when they have money in hand.
PAL (Phase Alternating Line). Broadcast standard
developed in Germany in 1963 and adopted in 1967. Color
system mainly used in Europe (except France), South
America, Africa, Oceania and China. PAL uses 625 scan
lines with a 25-frame/50-eld per second rate. (See Field,
NTSC, SECAM)
PanaBlack (Panasonic) (Monitor Feature). A PanaBlack
picture tube improves contrast, color reproduction and clar-
ity of detail. A dark black screen glass provides up to a 40%
increase in contrast, compared to conventional CRT’s, by
decreasing the amount of ambient light that passes through
the screen and reects back off of the phosphors.
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