Specifications

Elo TouchSystems (800) ELO-TOUCH or [phone] • Fax [phone] • www.elotouch.com
Glossary of “Touch” Terms and Related Technical Terminology
84
designation in the certification indicates evaluation to U.S.
and Canadian standards. Typical end products are
touchscreens, controllers, and kiosk touchmonitors.
USB
Universal Serial Bus, an external bus standard that supports
data transfer rates of 12 Mbps (12 million bits per second).
A single USB port can be used to connect up to 127
peripheral devices, such as mice, modems, and keyboards.
USB also supports Plug and Play installation.
user-friendly
Describes an interface—Web site, equipment, process—
that people find easy to use, or intuitive.
VCCI
A Japanese standard for RF emissions developed by the
Voluntary Control Council for Interference. The VCCI
marking on an end product indicates it has been tested for
compliance with the VCCI program.
vertical frequency
The number of times per second that the monitor can draw
all the lines on the entire screen. A higher vertical
frequency or refresh rate will reduce flicker, helping to
reduce user eyestrain and fatigue.
vertical scanning frequency
In interlaced mode, the number of fields written to the
screen every second, expressed in Hz. In noninterlaced
mode, it is the number of frames (complete pictures) written
to the screen every second (also known as refresh rate).
A higher vertical frequency or refresh rate will reduce
flicker, helping to reduce user eyestrain and fatigue.
VESA
Video Electronic Standards Association, a consortium of
manufacturers formed to establish and maintain industry-
wide standards for video cards and monitors. VESA was
instrumental in the introduction of the Super VGA and
Extended VGA video graphics standards with a refresh rate
of 70 Hz, minimizing flicker and helping to reduce user
eyestrain and fatigue. See also video graphics
adapters.
video bandwidth
See bandwidth.
video graphics adapter (VGA)
A card with character generator and an array of
microprocessors that translate bit information from the
computer into displayable video signals for the monitor.
These cards comply with various standards that determine
the nature of the quality of the display.
VGA, introduced in 1987, was the first analog card. It
offered still higher resolution than enhanced graphics
adapter (EGA)—640 x 480 pixels for graphics and 720 x
400 pixels for test—and a color palette of 256 colors. VGA
could also emulate EGA and color/graphics adapter (CGA).
Super VGA (SVGA), devised by VESA in 1989, offers a
resolution of 800 x 600 pixels.
XGA-8514A, introduced by IBM in 1990, offers a resolution
of 1024 x 768 pixels (interlaced) and a color palette of 256
colors.
Extended VGA (XVGA), introduced by VESA in 1991, offers
a top resolution of 1024 x 768 pixels (noninterlaced) and a
refresh rate significantly higher than that of IBM’s XGA-
8514A.
High-end graphics adapters, introduced in the late 1990s
for professional workstations, offer top resolutions from
1280 x 1024 to 1600 x 1280, horizontal line frequencies up
to 90 kHz, and bandwidths up to 200 MHz.
video signal
The output from the video graphics adapter incorporating
the red (R), green (G), and blue (B) signals and the
luminance signal, or combinations of these signals, that
pass to the video input of the monitor.
viewable image size (VIS)
Actual maximum viewable image size is dependent upon
the size of the plastic or bezel around the CRT. Typically, the
maximum possible for a "17-inch" monitor is actually
15.75 inches, plus or minus 0.25 inch at the ends of
diagonal measurement. VIS differs from diagonal linear
measurement.
VRAM/video memory
Random access memory for storing video information.
VRAM is a special-purpose RAM with two data paths for
access rather than the one path of a conventional RAM. The
two paths let the VRAM handle two tasks simultaneously:
display refresh and process access. VRAM does not force
the system to wait for one function to finish before starting
another, so it permits faster operation for the video
subsystem.