Specifications

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Glossary of “Touch” Terms and Related Technical Terminology
which produces a more stable image, helping to reduce
user eyestrain and fatigue.
I2C bus: access bus standard
A standard-protocol two-wire (clock and data) serial data
bus.
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.
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.