Specifications

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Glossary of “Touch” Terms and Related Technical Terminology
IC Class A
A Class A compliance statement means the design has been
tested for compliance with Industry Canada’s ICES 03 Class A
RF emissions limits and is suitable for use in non-residential
settings. Industry Canada’s RF emissions limits are identical
to the FCC’s. See also FCC Class A.
IC Class B
A Class B compliance statement means the design has been
tested for compliance with Industry Canada’s ICES 03 Class B
RF emissions limits, and is suitable for use in residential or
nonresidential settings. Industry Canada’s RF emissions limits
are identical to the FCC’s. See also FCC Class B.
interlaced scanning mode
A scheme that takes two passes to paint an on-screen image,
painting every other line on the first pass and sequentially
filling in the rest of the line on the second pass. This scheme
usually causes flicker. See also noninterlaced scanning
mode.
Invar shadow mask
A special type of shadow mask, made out of Invar and alloy,
that is able to withstand the high temperature generated by the
electron beam. The Invar shadow mask allows the CRT to
generate a brighter image than with the conventional shadow
mask. An advanced Invar shadow mask improves brightness
by 40 percent over the standard.
ISO 9241 part 3
An ergonomic standard that covers hardware, software,
workplace, and environment. It addresses the actual
application at the workplace. The objective of part 3 is to
ensure that the CRT display shall be legible, readable, and
comfortable in use.
LCD
Liquid crystal display. LCDs use two layers of polarizing material
separated by a liquid crystal solution. An electric current passed
through the liquid causes the crystals to align so that the light
cannot pass through them. Each crystal, controlled individually,
acts like a shutter. Color LCDs use two basic techniques for pro-
ducing color: Passive matrix is the less expensive, and active
matrix, also called Thin Film Transistor (TFT), provides a sharper
image.
linearity
The degree to which the actual location of a pixel on the
screen corresponds with its intended location. Nonlinearity
causes screen images to be more distorted in one area of the
screen than in another. This is sometimes caused by poor
voltage regulation in the monitor’s electronics.
magnetic field effects (MFE)
A monitor is affected by magnetic fields. When a screen
develops wrong colors in certain areas, or the picture becomes
distorted, check what is located near the monitor. A steel
cabinet, desk, bench, or steel girder imbedded in a wall or
ceiling could cause distortion of the picture tube’s electron
beams due to an impeding magnetic field. Moving the monitor
approximately 3 feet away from the suspected source can clear
the problem, as can degaussing it. Speakers should also be
considered as a possible source of distortion, since they may
also create a magnetic field when powered on.
memory
In technical references, the word memory used by itself refers
to random access memory (RAM).
modem
A device that allows one computer to communicate with
another over phone lines. It can be inside a computer
(internal) or external. All modern modems are also capable of
sending and receiving faxes with the use of fax software.
MPR II
A set of Swedish safety standards that covers the levels of
magnetic and electrical fields in both VLF and ELF ranges.
The Swedish National Board for Measurement and Testing
(SWEDAC) requires that products sold in Sweden comply
with MPR II. To measure emissions, a sophisticated test that
screens out background radiation must be in place. Since
distance to the CRT and orientation of the measuring device
affect measurement, precise placement of the measuring
device is essential and difficult to repeat. In addition, the
actual image displayed can have an impact on emissions, so
that a given set of measurements may not predict the
emissions a user would actually encounter. It is worth noting
that there are no scientific studies that conclude that
measurements above MPR II levels are hazardous.
See also TCO.
noninterlaced (NI) scanning mode
A scheme for assembling an image on the screen by painting
all the lines in one pass, then painting an entirely new frame.
Noninterlaced scanning mode reduces flicker. See also
interlaced scanning mode.
operating system (OS)
The program that runs a computer. The operating system
takes care of managing files and folders (such as renaming,
moving, copying, and deleting files). It also provides the
ability to start the other software you have on your computer.
Operating systems also usually include many programs, such
as a text editor, that are almost essential to have on every
computer.
opto-electronics
Infrared-light-emitting diodes (LEDs) and photo transistors
used for touch-sensing in infrared (IR) touchscreens.
opto-matrix frame
Used in infrared (IR) touchscreens. The touch frame contains
two opposite rows of IR-light-emitting diodes (LEDs) and
photo transistors, collectively referred to as opto-electronics,
concealed behind an IR-transparent bezel.