NEC LCD2180WG-LED
Technical Background and Feature Overview
NEC Display Solutions
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Color Gamut of a Display
The size and position of the triangle are de-
termined by the purity of the primary colors.
The purer the color, the closer it is to the edge
of the CIE horseshoe. Colors along the edge of
the horseshoe are made up of pure monochro-
matic light.
Color displays are additive color devices. Color
is formed by adding different proportions of
red, green and blue light. These primary colors
are formed by the glow of different types of
phosphors in the case of a CRT display, or by
filtering white light into red, green and blue
on an LCD.
When a light source is viewed as a spectrum, it
is possible to see the relationship between it’s
spectrum and position on the CIE color chart.
Red + Green = Yellow
Green + Blue = Cyan
Blue + Red = Magenta
Red + Green + Blue = White
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600
700
500
Light Wavelength (nm)
Monochromatic Light lies along the
edge of the CIE horseshoe
The color gamut of a display is limited by how
pure in color the red, green and blue primaries
are.
When viewed on a CIE xy color chart (a 2
dimensional plot of all colors visible to the hu-
man eye), the red, green, and blue primary col-
ors together form a triangle. Colors outside
of this triangle are outside of the displayable
color gamut.
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600
700
500
The largest possible color gamut using 3 colors
would be obtained by using 3 monochromatic
light sources such as LASERs.
Light Wavelength (nm)
Light made up of a broader spectrum
lies inside the CIE horseshoe.
Typical LCD monitors use a broad-band light
source such as CCFLs, which radiate a wide
spectrum of colors, including unwanted colors
The LCD2180WG-LED avoids the need for narrower
spectrum color filters by fundamentally changing
the spectrum of the backlight source. By using
LCD Operation and Color Gamut
With an LCD display, the color gamut is deter-
mined by a combination of the light source
used to illuminate the LCD panel(known as the
backlight) and of the LCD panel itself.
such as oranges, yellows, cyans. Only the pure red, red, green and blue power LEDs, which output
green and blue parts of the backlight spectrum
are wanted in order to maximize the color gamut
of the display.
a very narrow spectrum of light, a huge gain in
displayable color gamut can be achieved without
the need for using narrower color filters on each
sub-pixel.
It is important to understand that the backlight
for the LED based display is still “white” light,
but it is made up of very narrow-band red, green
and blue light, which when combined together, is
perceived by the human eye as white light. If this
light were to be shown as a rainbow spectrum us-
ing a prism, only the red, green and blue portions
of the rainbow would be seen.
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600
700
500
LCD Screen Sub-Pixel Structure
Light Wavelength (nm)
Typical CCFL Backlight Spectrum
Each pixel on the screen is made up of red, green
and blue sub-pixels. The colors of these sub-pix-
els are made by passing the backlight through
a color filter array. The characteristics of these
color filters in part determine the gamut of the
display.
In order to achieve a larger color gamut, it would
be necessary to filter the backlight into a nar-
rower spectrum of colors thus producing purer
red, green and blue. However, filtering into a nar-
rower spectrum is a technological challenge and
doing so also reduces the total amount of light
that is transmitted through the filter. This means
that the overall screen luminance is reduced or
must be compensated for by using more CCFL
backlights.
Backlight
TFT Array
Liquid Crystal
Color Filter Array
400
600
700
500
Light Wavelength (nm)
Combined LED Backlight Spectrum
LCD Color Filter Array
3
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The LCD2180WG-LED display further increases the
displayable color gamut by using a custom modi-
fied color filter on the blue sub-pixels reducing
the amount of cyan that passes through. This has
the effect of increasing the blue gamut beyond
that which is achievable using a blue LED and
standard blue filter.
AdobeRGB and beyond
Many mainstream output devices
such as ink jet printers can now pro-
duce colors that lie outside of even
the AdobeRGB colorspace.
The gamut of LCD2180WG-LED
exceeds AdobeRGB in the red and
magenta areas, making it possible to
view colors beyond AdobeRGB.
See diagram on page 9 for a more detailed expla-
nation of how the wide color gamut is achieved
and how it compares to a typical CCFL display.
The LCD2180WG-LED display complies
with the new AdobeRGB(1998) Refer-
ence Viewing Environment specifi-
cation. A preset for matching the
AdobeRGB color gamut is available
via the On Screen Display menu.
LED Backlight
The backlight source for the display is a linear
array of 48 individual red(18), green(20) and blue
(10) power LEDs. The light from these LEDs is
combined together to form white light, which is
the backlight source for the LCD panel.
increased intensity of the display makes direct
comparisons a reality.
Display Lifetime
Commercial LEDs have been around since the
early 1960s, however it is only within the last 10
years that blue LEDs have become available, and
only within the last couple of years that ultra
high brightness LEDs capable of replacing CCFLs
have become available with a comparable power
consumption. One of the major benefits of LEDs,
besides the narrow output spectrum, is the long
lifetime of typically 50,000 hours. This compares
to a typical CCFL based display lifetime of 25,000
hours.
Red, Green and Blue LED Array
Each LED that is used in the LCD2180WG-LED
display is individually chosen using a rigorous
screening process for color spectrum and lumi-
nance output in order to achieve the maximum
possible color gamut and color uniformity across
the display screen. Only a very small fraction
of the LEDs produced by the manufacturer are
deemed acceptable and chosen for use in the
display.
Display White Point
The intensity of the red, green and blue LEDs
can be individually controlled, allowing the white
point or color temperature of the resulting white
light to be adjusted. This represents a major ad-
vantage over traditional LCD displays that utilize
a CCFL backlight with a fixed color temperature.
Folded Light Guide Design
In order to allow the light from the individual red,
green and blue LEDs to mix together and appear
as a single white light source, the display features
a folded light guide design. Light from the row
of alternating colored LEDs is fed through a
light guide and curved mirrors at the rear of the
display.
Folded Light Guide and LED Array
In a traditional LCD display, the only way to
adjust the white point of the screen is by using
a look-up-table, which resides either in the host
computer’s video graphics adapter or internally
to the display itself.
Luminance
When compared to CRT monitors, the high bright-
ness of the power LED backlight allows for a much
higher screen intensity(brightness) to be used.
A typical intensity of 160 cd/m2, regardless of the
white point setting, allows the display to be used
where traditionally a darkened room was neces-
sary. Also where direct side-by-side comparisons
with print samples in a light box were previously
difficult due to the difference in luminance, the
This allows the light from the individual LEDs a
greater distance in which to mix together, thus
giving a much more uniform light source without
significantly increasing the depth of the display.
Changing the white point from the display’s
native white point means that one or two colors
have to be reduced in luminance using the look-
up-table. This means that fewer displayable colors
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are possible due to the look-up-table being used
to compensate for the white point. Depending on
the display’s native white point and the desired
white point, a significant number of display-
able colors may be lost leading to color banding
issues. This is especially true for displays that
do not feature programmable internal look-up-
tables with a depth of 10 bits or more.
Additionally, with traditional LCD displays, the na-
tive white point of the backlight source is fixed,
and the white point is adjusted using look-up-
tables. Therefore, the greyscale color tracking
of the display is often poor, especially for very
dark colors. This is because for very dark colors
including black, no color corrections are possible
using the look-up-table. The color of black on the
screen will be the color of the backlight source
that leaks through the LCD panel, which may dif-
fer from the desired white point.
Another advantage of the LED Backlight is that
the contrast ratio of the display remains almost
constant as the white point is changed in inten-
sity and color. This is because the intensity and
color of black will also change due to the entire
backlight source being adjusted, rather than
having a fixed backlight and LUT adjustment with
a typical LCD display.
Gamut Mapping/Emulation
While the native color gamut of the display
exceeds that of even AdobeRGB, it is sometimes
necessary to preview images as they would be
seen on a display with a smaller colorspace.
The LCD2180WG-LED has presets for emulating
displays with both sRGB and AdobeRGB gamuts
by using internal color gamut mapping. These
presets can be selected with the touch of a but-
ton and will transform the displayed image into
either sRGB or AdobeRGB gamuts.
LED Backlight monitor
CCFL Backlight monitor
LUT Input
Typical CCFL Display LUT
However with the LCD2180WG-LED display, the
white point is adjusted by directly varying the
brightness of the red, green and blue LEDs. This
means that the full range of the internal 10
bit look-up-tables is available for performing
response curve and gamma adjustments.
1
2
3
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6
7
8
9
10
Delta-E
Typical Color Tracking
With the LED backlight, the white point of the
entire backlight source is changed by varying the
intensity of the red, green and blue LEDs. So the
color of absolute black on the screen will be much
closer to the intended white point. This provides
vastly improved greyscale color tracking.
LUT Input
OmniColor Hue & Saturation Adjustment
Typical LED Display LUT
HOST COMPUTER
LCD2180WG-LED DISPLAY MONITOR
10 Bit Look Up Tables
Since the LCD2180WG-LED has internal 10 bit Look Up
Tables(LUTs), that can be programmed by the calibration
software, the 8x8 bit LUT on the Host Computer can be
set to linear. This means that no steps are lost in an 8x8
LUT and subsequent 8 bit DVI bottleneck(assuming 10
bit DVI functionality is not used).
8 bit x 3 colors
Frame Buffer
8 bit in x 8 bit out
x 3 colors LUT
(Set to Linear)
8 bits in x 10 bits out
x 3 colors LUT
LCD Panel
with LED Backlight
8 bit DVI
DDC/CI Adjustment
Also, since the white point of the display is controlled
directly by varying the intensity of the Red, Green and
Blue LEDs, the 10 bit LUTs in the display are only used
for gamma/tone response curve corrections. This pre-
serves the maximum number of discrete color levels.
HOST COMPUTER
TYPICAL CCFL DISPLAY MONITOR
8 bit x 3 colors
Frame Buffer
8 bit in x 8 bit out
x 3 colors LUT
8 bits in x 8 bits out
x 3 colors LUT
LCD Panel
with CCFL Backlight
8 bit DVI
On a traditional CCFL display monitor, the 8x8 LUT on the
host computer is used for both white point and gamma
/tone response curve corrections. This means a loss in
the total number of discrete color levels which can lead
to color banding issues.
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If necessary, custom gamuts can be achieved by
manual adjustment of the display using its ad-
vanced 6-axis color hue and saturation controls.
While other CCFL based LCD displays may claim to
have similar optical feedback systems, they typi-
cally only monitor the luminance of the backlight
source and not its true white point. CCFLs have
an operating temperature vs output color spec-
trum dependency which can produce a change in
the white point of the display as it warms up to
operating temperature; even if the overall lumi-
nance is compensated using a luminance based
optical feedback system.
called ColorComp which aims to reduce any
screen uniformity errors to almost unnoticeable
levels. This system works by applying a digital cor-
rection to each pixel on the screen to compen-
sate for differences in color and luminance.
These controls allow the hue and saturation of
red, yellow, green, cyan, blue and magenta areas
of the color gamut to be manipulated indepen-
dently.
Each display is individually characterized during
production using a fully automated system which
measures hundreds of points across the screen
at different grey levels. These measurements
are used to build a three dimensional correc-
tion matrix for the display screen which is then
stored inside the display. This data is used to
compensate for the screen uniformity, not only as
a function of position on the display screen, but
also as a function of grey level.
Color Stability
While LEDs have excellent light output and
lifetime characteristics, they are inherently
unstable devices and have very strong tempera-
ture and supply current dependencies. This would
normally make LEDs unsuitable for color critical
applications where a change in luminance of just
a fraction of a percentage would produce an
unacceptable color or luminance shift.
10
9
LED Backlight monitor
8
CCFL Backlight monitor
7
6
5
4
3
2
1
If desired, the ColorComp correction can be
turned off in order to maximize the screen
brightness.
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5
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9
10
Time after power on (minutes)
+85˚
+25˚C
-20˚C
Color Stability Comparison
Uncompensated Light Output vs Temperature
Temperature Compensation
Therefore the LCD2180WG-LED display employs a
unique internal optical feedback system which
constantly measures both the luminance and
color of the LED backlight source and automati-
The LCD2180WG-LED features a unique tem-
perature compensation system that constantly
monitors the internal temperature of the display
and corrects for changes in the LCD panel color
cally corrects for any short or long term changes. characteristics due to temperature shifts as
This means that the backlight source is constant well as changes in the sensitivity of the internal
and the screen can be used for critical color work optical feedback sensor. This compensation allows
Example Uniformity Without Correction
within a couple of minutes of powering on the
display. Short term changes such as the display
warming up, and longer term changes such as
aging decreasing the efficiency of the LED, are
automatically compensated for.
the display to achieve an unparalleled level of
color stability even as it warms up to full operat-
ing temperature. This means that the display
can then be used for color critical work within a
couple of minutes of turning on, compared to up
to 30-60 minutes for conventional displays.
Temperature
Sensor
Mura Compensation
All display monitors have some form of screen
uniformity errors, or mura, across the display
area due to a combination of non-uniformities
in the LCD panel itself, and the LCD backlight
system. This non-uniformity can be seen as
combination of shifts in color and/or luminance,
which, depending on the severity, may be very
noticeable and appear as uneven areas of color
across the display.
Folded Light Guide and LCD Panel
Color
Sensor
LED Array
Uniformity With ColorComp Correction
LED Power Driver
Dual Video Inputs
Microprocessor
The LCD2180WG-LED has two DVI video inputs for
connecting to two different host computers. The
input can be switched with the touch of a button.
The LCD2180WG-LED introduces a new screen
uniformity compensation and correction system
Optical Feedback System
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The need for 10 bit color depth
Normal color gamut display showing
available discrete colors with 8 bit
video (number of colors reduced for
purposes of explanation)
The increased color gamut of the display means that the
overall color “volume” of displayable colors has increased
significantly. However the number of discrete color levels
from the host system has not changed from the standard
16+ million colors, unless video graphics adapters, ap-
plications and Operating Systems, that all support 10 bit
graphic processing are used.
This means that there are fewer discrete displayable color
levels per unit of color volume on a wide gamut display
than on a standard gamut display, which can lead to color
banding issues.
The same number of discrete colors
on a wide color gamut display occupy
a larger volume.
Due to the LCD2180WG-LED being able to use the red, green
and blue LED intensity to adjust the white point, rather
than sacrificing displayable color levels using look-up-ta-
bles, this loss does not present a significant problem. How-
ever the display will be able to take advantage of future
generations of video graphics adapters, applications and
Operating Systems that are capable of outputting video
with the full 10 bit digital video depth that the display is
capable of accepting, thus providing an end-to-end color
palette of up to more than 1,000,000,000 displayable
colors.
When 10 bit video is used instead of 8
bit, up to ꢂꢀ times as many discrete
colors are available.
using a special spatial algorithm that ensures
The SpectraViewII software communicates with
the display directly using Display Data Channel
- Command Interface(DDC/CI), which is a two-way
communications link between the video graph-
ics adapter and display monitor that uses the
standard video signal cable. No extra cables are
necessary. All adjustments to monitor settings
10 Bit Interface
that adjacent pixels operate at different parts
of the Frame Rate Control cycle thus making
any artifacts of the Frame Rate Control process
imperceptible.
The LCD2180WG-LED features a video input that
supports 10 bit digital video using a single Dual-
Link DVI cable. This means that the full capabili-
ties of the 10 bit display can be realized without
being restricted to an 8 bit video input source.
Passive Cooling
The power LEDs used in the display dissipate heat are performed automatically using this commu-
While there are not currently any mainstream
video graphics adapters or operating systems
that support full 10 bit video processing and
output, the LCD2180WG-LED display is designed
for future compatibility and leads the way to the
time when 10 bit video will become mainstream.
during operation. The display uses a combination
of a large heat sink with convection cooling to
maintain the temperature of the display. This
nications link.
The LCD2180WG-LED features three internal 10
eliminates the need for a cooling fan which would bit LUTs(one for each color) that are programmed
introduce acoustic noise.
directly by SpectraViewII via DDC/CI. These tables
allow very precise adjustments to be made to the
display’s Tone Response Curve without signifi-
cantly reducing the number of displayable colors.
Because all of the Tone Response Curve adjust-
ments are done in a 10 bit domain within the
display itself, the host computer’s video graphics
adapter’s LUTs are set to linear, thus maximizing
the use of the 16+ million color palette in an 8 bit
color system.
Mercury Free Design
Advanced FRC
Unlike CCFL backlight based displays, which con-
tain mercury vapor inside the florescent lamps,
thereby restricting the usage in certain operat-
ing environments, the LCD2180WG-LED display is
mercury free and RoHS compliant.
The LCD panel on the LCD2180WG-LED display
achieves an effective output of 10 bits per color
by using an advanced Frame Rate Control dither-
ing algorithm. As with other 10 bit color displays,
the panel supports the most significant 8 bits
of video directly and the 2 least significant bits
are displayed by using a time-domain dither-
ing method known as Frame Rate Control, in
which pixels are changed in intensity according
to the level of the 2 lower bits at a rate that is
faster than the human eye can perceive. This
time-domain dithering is further enhanced by
Color Calibration
The optional SpectraViewII color calibration
package offers further enhancements by provid-
ing a wide array of functions and features for
calibrating, profiling and monitoring the status
of the display.
The software allows custom target calibrations
to be created with preset or user definable white
points, intensity levels and tone response curves
(gamma curves). Advanced tone response curves
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such as DICOM, used for medical imaging, are also
available.
Once SpectraViewII has calibrated the display, the
OSD(On Screen Display) controls can be locked to
prevent accidental or unauthorized adjustment
which may invalidate the calibrated state of the
monitor.
Color Measurement
The output color spectrum of the LCD2180WG-
LED display presents a unique challenge to
the current generation of colorimeter devices
which were never designed to be used on such
a display, just as LCD displays were a challenge
to colorimeters that were only designed for
CRT displays.
The software features a Colorimeter function
which allows direct measurements to be taken
by the color sensor and the results displayed in a
variety of different formats.
To overcome this, the optional SpectraViewII
color calibration package for the LCD2180WG-
LED display includes a custom calibrated
Gretag iOne Display V2 colorimeter that has
been specifically calibrated for accurate
measurement of the display. The device can
continue to be used to measure standard LCD
displays as well, if a multi-monitor configura-
tion is used.
The SpectraViewII software integrates with the
NEC NaViSet Administrator network software
(Available separately from your NEC representa-
tive. Windows platform only) to provide remote
network access and monitoring of display
monitors. NaViSet Administrator is able to read,
display, and log the current calibration settings
and status of displays on a LAN. This feature is
particularly useful for large installations where
central monitoring and asset management is
needed.
Calibration Target Configuration
At the end of each monitor calibration proce-
dure, the display is automatically profiled and
highly accurate ICC/ColorSync color profiles are
generated and automatically registered with the
Color Management System. These profiles use the
Bradford Chromaticity Adaptation matrix.
NEC is actively working with manufacturers of
colorimeter devices to ensure that their fu-
ture standard products are able to accurately
measure the color characteristics of wide
color gamut displays.
Target and actual measured results are analyzed
and displayed, showing a wealth of information
about the display such as the measured color
gamut, greyscale color tracking, Delta-E, and lu-
minance values. Additional information about the
display monitor such as the model name, serial
Workflow Challenges With
Wide Color Gamut Displays
The use of a wide color gamut display is not with-
out its challenges. Many people who have used
While the LCD2180WG-LED ships with color profiles
for the factory preset color settings, the use of
a color calibration package is normally essential
for accurate custom calibration and profiling of
the display.
number and the total number of hours that it has a wide gamut display have come to realize that
been in use are also displayed.
while it is now possible to display colors that were
otherwise unable to be previewed on-screen,
challenges in other areas emerge.
For example, with being able to see colors on the
screen that were never before possible to display,
it is now easy to see problem areas in other parts
of the color workflow such as deficiencies in
printer or separation profiles.
The issue of having to continue to use some
legacy standard color gamut displays and
un-tagged source images in a color workflow is
another challenge.
Calibration Results Summary
Also it now becomes essential to utilize a color
management system with the display, by the cor-
rect use of ICC/ColorSync display profiles. Without
the use of a color management system, all colors
are mapped to the larger color gamut of the
display. This results in images that appear to be
super-saturated and distorted in color.
Sample Image
Accurate color profiles of the display allow the
color management system to correctly map the
source image gamut into the color gamut of the
display.
Color Tracking Report
Image Displayed Without Color Management
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Model
LCD2180WG LED (LCD2180WG-LED-BK-SV)
SpectraViewII Requirements
Operating System
Mac OS
Microsoft Windows
Display
Apple Mac OS X v10.2 or higher. Microsoft Windows 2000, XP, or
Server 2003. 64 bit versions of
Windows XP are not currently
Viewable Size Image
Pixel Pitch
21.3"/54 cm
0.27mm
Pixels Per Inch
94 @ native resolution
supported.
Brightness (typical)
200 cd/m2 with ColorComp off
150 cd/m2 with ColorComp on
430:1
Video Graphics Card
All Apple standard video
ATI Radeon, Nvidia, Matrox, 3DLabs
Contrast Ratio (typical)
Viewing Angle (typical)
Response Time (typical)
Display Colors
graphics cards, including most and others. Check website for
newer PowerBooks with a DVI-D further information.
output connector.
176° Vert., 176° Hor. (88U/88D/88L/88R)@ CR>10
Rapid Response(20ms)
Up to more than 16 million with 8 bit video
Up to more than 1 billion with 10 bit video
Video color depth
At least 24 bit color(Millions
of colors).
At least 24 bit color.
Color Chromaticities CIE x,y (typical)
Red
Green
Blue
0.68, 0.31
0.21, 0.71
0.15, 0.07
Supported Color Sensors
GretagMacbeth Eye-One display GretagMacbeth Eye-One display V1
V1 and V2, Eye-One Monitor,
Eye-One Pro, Monaco OptixXR
(X-Rite DTP 94).
and V2, Eye-One Monitor, Eye-One
Pro, and Spectrolino, Monaco
OptixXR (X-Rite DTP 94).
Color Scale Achievement
NTSC
103%
107%
USB
At least one available USB port At least one available USB port for
Adobe RGB
for Color Sensor.
Color Sensor, or one RS232 port if
using the Spectrolino.
Video Input
DVI-D(2). 10 bit video supported on Input 2.
Synchronization Range
Horizontal
75 kHz
60 Hz
Vertical
Resolutions Supported
DIGITAL
1600 x 1200 @ 60 Hz
Recommended Resolution
Additional Features
1600 x 1200
Ultra-thin frame(bezel), tilt base, XtraView+
wide-angle viewing technology, cable manage-
ment, ColorComp screen uniformity correction,
OmniColor 6-axis color control, 10-bit video input
(using DualLink DVI), sRGB and Adobe RGB color-
space emulation, digital controls, vacation switch,
power-off timer, color temperature mode, serial
number display, Rapid Response, ISO 13406-2
Touch-Capable
Voltage Rating
No
100-240V @ 50-60 Hz
Power Consumption (typical)
On
100W
7W
Power Savings Mode
Dimensions (WxHxD)
Net (with stand)
18.6 x 18.2 x 8.3 in./473 x 461.7 x 211.9mm
18.6 x 14.6 x 4.9 in./473 x 370.4 x 124.5mm
Net (without stand)
Net Weight
(with stand)
(without stand)
40.3 lbs./18.3 kg
31.1 lbs./14.1 kg
VESA Hole Configuration Specifications
100 x 100mm
Environmental Conditions
Operating Temperature
Operating Humidity
Operating Altitude
5-35° C/41-95° F
30-80%
3658m/12,001 ft.
-10-60° C/14-140° F
10-85%
Storage Temperature
Storage Humidity
Storage Altitude
12,192m/40,000 ft.
Regulatory Approvals
UL/C-UL or CSA, FCC Class B/Canadian DOC, TUV GS,
TUV Ergonomie, CE
RoHS Compliant
Yes
Optional Accessories
SpectraView Color Calibration Kit(custom-cali-
brated colorIiImeter and software)*, hood
Limited Warranty
Technical Support
3 years parts and labor, including backlight
24 hours/7 days
* Monitor available as bundled solution with SpectraViewII Color Calibration Kit, which includes custom calibrated Gretag iOne Display V2.
Advanced No Touch Auto Adjust, Ambix+, AutoBright, GammaComp, NaViSet, Rapid Response, Spectra-
NEC Display Solutions
ꢁ00 Park Boulevard, Suite 1100
Itasca, IL ꢂ01ꢀ3
8ꢂꢂ-NEC-MORE
ViewII, TileMatrix and TileComp are trademarks of NEC Display Solutions. All other brand or product
names are trademarks or registered trademarks of their respective holders. Product specifications
subject to change. 12/05 ver. 2.
©2005 NEC Display Solutions of America, Inc.
All rights reserved.
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