16 bit Technology
It's a technology that allows to elaborate videos
without reducing the quality in a perceptible way. After this elaboration
(called Gamma Correction) it is possible to visualize 65.000 color's levels for
each of the three primary colors. This means that can be visualized 65.000 x
65.000 x 65.000 = 274,625 billions colors.
Brillance
Candela
Cathod Tube
The cathode ray tube or CRT, invented by Karl Ferdinand
Braun, is the display device that was traditionally used in most computer
displays, video monitors, televisions and oscilloscopes.
The CRT developed
from Philo Farnsworth's work was used in all television sets until the late 20th
century and the advent of plasma displays, LCDs, DLP displays, and other
technologies.
As a result of this technology, television continues to be
referred to as "The Tube" well into the 21st century, even when referring to
non-CRT sets.
LED giant displays and CRT monitors are totally different, both
for functioning principle and type of application.
CDM
CDM is the acronim of Candela per Square Meter (cd/m2),
the Standard unit of luminance (also called Nits in the USA, from latin "nitere"
= "to shine").
1 Candela is equal to 1 NIT.
Candela measures how much
light is produced as measured at the light source.
Color's Levels
Are the touches that every color can have. In the LED
visualization field are considered the color's levels of Red, Green and Blue,
the three primary colors. It is obvious that higher is the number of possible
touches, higher is the quality and the naturalness of the visualized image.
Color's Temperature
It's a measure of reference defined by CIE
(International Commission for Illumination) and it is measured in Kelvin degrees . The color's temperature needed to get the Pure White is around 6000.
Contrast Level
It's the difference between the light emitted by the
display and the environmental light reflected by the display's surface. Minor is
the light reflected, higher is the contrast and therefore the cleanliness and
naturalness of the images.
Control PC
It is a PC that manage the maxi-display, to which is
directly linked. It can be installed internally (embedded PC) or within a few
meters from the display.
Definition
It's the maxi-display's total number of horizontal and
vertical LEDs. Basically the Resolution is referred to the single module of 1 m2
, while the Definition is referred to the whole display (once all the modules
have been assembled).
DVI
Is the acronym of Digital Visual Interface and it is a
standard interface created by the Digital Display Working Group. The DVI
standard was created to allow the transfer of big quantity of video data in
digital format, regardless of the type of monitor utilized.
Gamma
See Gamma Correction
Gamma Correction
Gamma correction is a image management system
indispensable when it is needed to visualize high quality images on every kind
of monitor, from the television to the PC monitor and the LED maxi-display. Gamma
correction controls and manages the brightness and cleanliness of the images.
IP Protection
It is the degree of protection against dust and
humidity. It is identified as IP acronym of "Ingress Protection"
LED
Is the acronym of Light Emitting Diode. The LED is a
semiconductor that emits light when electricity pass through it. The color of
the light emitted can be of different colors Red, Green, Blue, Amber,
White.
Lumen
A unit of measurement of the amount of brightness that
comes from a light source. The standard lumen rating of a data projector is the
average of photometer readings at several points on a full white image on the
display.
Technically, lumens measure "luminous flux." A wax candle generates
13 lumens; a 100 watt bulb generates 1,200. The lumen rating is a critical
specification when choosing a data projector. In a darkened room, 500 lumens may
be ample; however, in a conference room with normal lighting, 1,000 lumens would
be better. In a room with bright daylight, 2,000 lumens is preferred.
Luminance
Luminance (also called luminosity) is a photometric
measure of the density of luminous intensity in a given direction. It describes
the amount of light that passes through or is emitted from a particular area,
and falls within a given solid angle. It is measured in candela per square metre
(cd/m2).
mCd
mCd is the arconim of millicandela (or mCd =
CD/1000).
1000 millicandela equals 1 candela (CD).
It is the unit of
measure commonly used to describe LED brightness. Candela measures how much
light is produced as measured at the light source.
Please also see CDM
(candela per aquare meter).
NIT
Please see CDM
Pitch
It's the distance between the pixels, expressed in
millimetres. It is a fundamental measure as it defines the image's quality, the
displays minimum viewing distance and besides it affect significantly the final
cost of the maxi-display.
Pixel
It's the luminous dot typical of every LED
visualization device. It can be composed by one or more LEDs (in some model the
pixel is composed by 36 LEDs)
Plasma Display
The basic idea of a plasma display is to illuminate
tiny colored fluorescent lights to form an image. Each pixel is made up of three
fluorescent lights -- a red light, a green light and a blue light. Just like a
CRT television, the plasma display varies the intensities of the different
lights to produce a full range of colors.
The central element in a
fluorescent light is a plasma, a gas made up of free-flowing ions (electrically
charged atoms) and electrons (negatively charged particles). Under normal
conditions, a gas is mainly made up of uncharged particles. If you introduce
many free electrons into the gas by establishing an electrical voltage across
it, the situation changes very quickly.
By varying the pulses of current
flowing through the different cells, the control system can increase or decrease
the intensity of each subpixel color to create hundreds of different
combinations of red, green and blue. In this way, the control system can produce
colors across the entire spectrum.
Plug & Play
The "Plug and Play" technology is a capability
developed by Microsoft that gives users the ability to plug a device into a
computer and have the computer recognize that the device is there. The user
doesn't have to tell the computer. In many earlier computer systems, the user
was required to explicitly tell the operating system when a new device had been
added.
Readeability
It's the maximum distance within the images visualized
on the LED display are readable, therefore clearly recognizable.
Refresh Rate
The refresh rate identify the number of times that the
image is refreshed every second.
Remote PC
It is a second PC linked to the Control PC: it is
utilized in every situation in which the position of the display does not allow
the access to the Control PC (for example a large height installation). This
Remote PC communicate directly with the Control PC and it manage the settings to
be transmitted to the display.
Rental Display
Ideal for temporary applications like live concerts,
sports events, TV shows, fashion shows, open air events exhibitions and
conventions. Rental displays are specifically designed to
guarantee lightness and portability of the modules but also strength and
solidity of a structure which undergoes frequent assembling stress.
Resolution
It the number of LEDs mounted on every m2. Obviously
higher is the number of LEDs, better is the image quality. It is important to
note that smaller is the pitch, higher is the resolution.
RGB
Is the acronym of Red, Green, Blue. Every color
perceptible by the human eye is generated by a proportionate mix of these three
primary colors
SMD
See SMD Top Led
SMD Top Led
The SMD technology is electronics new frontier a real
revolution it brought in the graphic visualization field, is the miniaturization
of all the electronic components, LEDs included. All the SMD components are
mounted on the surface of the electronic board (SMD is the acronym on surface
Mounting Device ), without passing through it.
Stand-alone Display
The stand-alone displays function as a display connected
to a VCR that shows everything has been pre-recorded on the videotape. Therefore
once the sequence of images to be visualized has been memorized, there is no
need for a Control PC to keep functioning. For this reason stand-alone displays
are not able to forecast live videos which is a feature of the Modular Graphic
Displays. Top Led
See SMD Top Led
Viewing Angle
A display viewing angle is the angle within which the
brightness of the display is reduced by 50% of the frontal luminosity. For
example, a display with a frontal brightness of 6000 NIT (NIT = millicandels for
m2) has a viewing angle equal to the angulation in which its brightness is
reduced to 3000 NIT.
Virtual Pixel
The virtual pixel is a image management technology that
allows to visualize images with a definition higher than the physical definition
of the display thank to a technique called pixel interpolation
Visibility
It the maximum distance within the LED display is able
to capture human eye attention, even if the images are not perfectly
recognizable. The visibility of a maxi display is usually equal to the double of
the readability. |