Acer P7280 EY.J7801.001 Manual Do Utilizador

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Glossary

Abbreviation for American National Standards Institute. 
ANSI is an American organisation (member of the ISO), 
which produces uniform regulations/standards and 
monitors their compliance. ANSI standards are recognised 
worldwide. The standards for calculating display screen 
brightness in lumen are particularly interesting for 
projection technology.

This function automatically synchronises the data 
video projector with the display screen mode of the 
computer and at the same time corrects the tracking 
(frame width) and H-phase (fine adjustment for 
optimum frame width).

All manufacturers are fighting to increase the brightness 
of the projected image. Brightness is measured in terms 
of 'ANSI Lumens' and the brightest machines command a 
premium price. Projectors in the range 300-600 lumens are 
best used away from direct daylight and with no office 
lighting. Units in the range 600-1,000 lumens can be 
used in most office condition away from direct sunlight. 
Units above 1,200 lumens are ideal for larger offices and 
conference rooms. No projector can really compete 
against direct sunlight!

Cinch connections are used for sound and video 
transmissions. The cinch socket for video is often marked 
with a yellow ring. The connections for the 
left-hand/right-hand sound channel are usually white 
and red respectively.

Component video is the most common type of 

high-quality signal available today. While a composite 
cable carries the entire video signal on a single cable, 
component video cables split the signal in three. 
This connection gives a much better image than do 
composite or S-video connections; the projector you 
buy should have at least one of these inputs.

Contrast attracts less attention but is important. Contrast 
measures the difference in light intensity between the 
dark and light areas of the screen. A high contrast figure 
is best; typically data projectors work in the range 
150 to 400. DLP

®

technology units tend to produce 

a higher contrast image.

DLP

®

stands for Digital Light Processing

™

. It is a digital, 

reflective technology, which was developed by Texas 
Instruments. Digital projection provides an imaging quality 
that satisfies the highest standards. These include natural 
colours, even graphic display. Data is displayed without 
colour convergence problems, as the technology manages 
with only one transmitter.

(digital video interface) is an interface for transmitting
digital video and graphic data. It was developed by the 
computer industry for high-end graphic cards and 
high-resolution TFT displays to a standard interface. 
DVI is fully upward compatible with HDMI.

High-efficiency feature that doubles lamp life while 
providing quieter operation. This smart innovation 
saves money and eliminates the hassle of frequent 
lamp replacement.

If a data video projector detects a computer mode that 

doesn't equate to the original resolution of the 
projector, it converts the mode. The aim is usually to 
achieve a display that fills the largest possible area of the 
screen or monitor. Data video projectors for business use 
often provide the comfort feature of recalculating the 
mode so that the display quality remains optimal.

Also known as "Still Picture", the "Freeze" function allows the 
presenter to freeze-frame their presentation on the projector, 
allowing the audience to see only that slide, while the presenter can 
successfully toggle their documents on the PC desktop. 
When ready, the presenter can depress the freeze function and 
continue the presentation.

The Acer Empowering Key on the remote control or the 

projector control panel offers a quick, easy way to access
Acer Empowering Technology tools: Acer eView Management 
allows users to select the optimal display mode depending on 
the content type. Acer eTimer Management lets the user set a 
timer function during presentations. A timer and reminder are 
displayed on the screen, and an alarm sounds when time is 
up. Acer eOpening Management encourages users to select 
their own projector startup image, such as a company logo or 
personalized picture.

(High Bandwidth Digital Content Protection) is the copy 
protection system for the new DVI and HDMI digital video 
interfaces. To ensure problem-free functioning of the DVI and 
HDMI interfaces for video data, HDCP must be correctly 
implemented by the manufacturer in both connected devices.

(High Definition Multimedia Interface) is a interface for fully 
digital transmission of audio and video data. HDMI was 
developed by the industry specifically for the home 
entertainment segment, which is seeing the increasing use of 
digital components and in which software is also increasingly 
available in primarily digital form (e.g. DVD, DVB, BluRay etc.)

Abbreviation for High Definition TeleVision. 
This technique transmits high definition television pictures 
(1,000 to 1,200 lines).

If the presentation device projects upwards at an angle to the 
screen (not at right angles), the image is distorted in a 
trapezium form. Modern data video projector electronics can 
be used to correct the distortion. The image points/pixels are 
compressed and the image is slightly reduced in size. Also 
called trapezium correction.

The Kensington Lock is a universal security system, which is often 

used for data video projectors (beamers), notebooks and laptops. 
It consists of a steel cable with a lock, which is passed around an 
immovable object and then inserted into a corresponding interface 
of the product to be secured.

In video terms, a playback system which first draws in 
alternate lines sequentially, then fills in the remaining 
information. The opposite is non-interlaced 
or progressive.

Luma/Lumen   Projector brightness is measured in ANSI lumens. 

Front projectors start as low as 1,000 lumens and can reach an 
output of more than 2,500 lumens.

Video projectors featuring DLP

®

technology come with both 

standard (4:3) and wide screen (16:9) "native" resolutions. 
In other words, the chip inside the projector, which is like a 
miniature version of the image it helps create, is shaped in the 
specified 4:3 or 16:9 dimension. Most projectors can switch 
between 4:3 and 16:9 ratios—you will see black bars either on 
the sides or top and bottom of your projected image when 
they do so. If you will be using your projector for standard TV, 
HDTV and DVDs, make sure your projector can switch 
between these modes.

Amount of noise emitted from projector. Lower numbers mean 
less noise is generated. A very soft whisper is 
approximately 30 dB.

Abbreviation for On-Screen Display. Also called Menu Assistance. 
The image parameters of a data video projector 
can be set using a menu window.

A term that is also popular in data video projection. Plug & 
Play projectors communicate directly with the computer 
connected to them and synchronise themselves automatically. 
The user only has to connect the cables and switches the 
appliances on so that they are ready for presentation.

Rainbow effect (or colour separation) can be caused by the 

spinning colour wheel used in single chip DLP projectors, 
where the image is created by one DMD (Digital Mirror Device) 
and the colour is added by shinning the reflected light through a
spinning multi-segment colour wheel. By using DLP 
Technology, projectors can be made lighter in weight and 
smaller in design while also producing contrast ratios of up to 
2000:1 and beyond. Rainbow effect can be seen in varying 
degrees from person to person and manifests itself by the 
appearance of a coloured shimmer on the following edge of 
moving images, partially in high contrasting scenes. 
To overcome this minor problem some manufacturers have 
developed faster spinning and more segmented colour wheels.

Digital images are made up of a number of individual points 
or dots, which are called pixels and the number of pixels varies 
depending on the graphic card and software. Resolution is 
given in pixels. To ensure the best picture quality, you can 
adjust your laptop's resolution setting to match the projector's 
native resolution.

Abbreviated form of additive colour mixture (Red, Green, Blue).
Data video projectors use the RGB colour model and make up
all colours from the primary colours red, green and blue.

Abbreviation for Recommended Standard 232-C. An interface 
that is used for serial data transmission. Modern data video 
projectors can be integrated in larger systems and operated via 
an external control unit. This control unit is connected to the 
RS232 interface of the projector.

The abbreviation stands for Super High Performance. 
It is a new type of metal vapour lamp that e.g. is used in data video 
projectors. SHP lamps produce a lot of light but consume 
little energy and provide a colour temperature similar to 
that of daylight.

UHB stands for Ultra High Brightness, UHP for Ultra High 
Pressure. This is a modern type of lamp that is particularly 
powerful, however consumes little energy. This lamp is 
increasingly being used for data video projectors.

Abbreviation for Universal Serial Bus, a standard interface for 
many Apple-Macintoshes and PCs. Hardware components are 
automatically detected and configured by the computer and are 
therefore ready for use immediately.

Abbreviation for Super Video Graphics Adapter or Super VGA. 
Display screen standard with a resolution of 800 x 600 pixels.

Nearly all projectors featuring DLP

®

technology will have at least 

one composite and one S-video connection. S-video cables differ

from  composite cables in that they split the video signal into 
two different components, luminance and chrominance, 
resulting in a significantly better image than a composite 
cable can provide.

Abbreviation for Extended Video Graphics Adapter. A display 
screen standard with a resolution of maximum 1,024 x 768 
pixels. It is currently the most common business standard.

Abbreviation for Video Graphics Adapter or Video Graphics 
Array. Display screen standard with a resolution of 720 x 400 
pixels in text mode and 640 x 480 pixels in graphic mode.

Abbreviation for Ultra extended Graphics Array. Display screen 
standard with a resolution of maximum 1,600 x 1,200 pixels.