NEC Display Wall Calibrator system will automatically adjust multiple displays used in a video wall so that
the color characteristics closely match, thereby creating the visual illusion of a single large display.

In order to accomplish this, the color characteristics of each display must be individually measured and compared to all of the other displays in the video wall. The optimal settings for each display can then be calculated so that all the displays will match after calibration.

Since each display will vary in both color and intensity (brightness), due to aging, individual components
and tolerances, it is necessary to find the lowest common denominator that all of the displays are capable of collectively achieving. In other words, the video wall can only be as bright as the dimmest individual display.

The color characteristics of each display are measured using a color sensor, which is connected via USB to a host PC. The sensor is placed on the screen and a series of test patterns is generated and measured. This process is repeated for all displays.

The host PC does not have to supply any type of video signal to the displays in the video wall, as test patterns are automatically generated within in each display. Communications with each display from the host PC are performed via either RS232 or LAN (Ethernet).

Once all of the displays have been measured, the calibration Target can be calculated. This Target defines the various calibration parameters such as the white point (color of pure white on the screen), intensity (brightness), gamma, etc.

Each display is then calibrated to this Target setting by placing the color sensor on the screen while the software adjusts the internal controls of the display. This process is repeated for all displays.

When the calibration process is completed, all of the displays will match. The numerical results of the calibration process can be viewed, and also the configuration settings for each display and the entire project can be saved for future reference and use.

Once the connections to each display have been made and configured, the measurement and calibration process typically takes between 3 to 6 minutes per display.

NEC Display Wall Calibrator is available on Apple Mac OS, and Microsoft Windows.

Main Features and benefits

Automatic calibration
NEC Display Wall Calibrator communicates with the display monitors directly using either RS232 or a LAN (Ethernet) connection. All adjustments to the display settings are performed automatically using this communications link. It is not necessary to manually configure the displays as all of the necessary settings are made by the software.
Internal Test Patterns
Displays are calibrated using internally generated test patterns. This simplifies the operation by allowing calibration to be performed automatically without having to manually select different test patterns during the calibration process, and without the need to connect a PC to the video input of the displays.
10 bit internal Look Up Tables (LUTs)
Each LCD display monitor supported by NEC Display Wall Calibrator features three internal 10 bit LUTs. These tables allow very precise adjustments to be made to the display’s Tone Response Curve without reducing the number of displayable colors or introducing color banding artifacts.
Gamma Correction
As well as adjusting the Intensity (luminance) and white point of the displays, the software will also calibrate the grayscale using the internal LUTs of the displays. This means that highly accurate color can be achieved not only at 100% white, but at all steps along the grayscale. A variety of different Tone Response Curves can be applied also, from something as simple as a small simple gamma value to complex custom curves.
Flexible Connections
Displays can be connected using RS232, LAN, or in combinations of both, to the host PC used to perform the calibration. By using a wireless equipped host PC and LAN, displays can be calibrated without making any physical connections to the host PC.
All display configurations, measurements, and calibration data can be saved as a project file for later reference, re-calibration etc.
Multiple Calibration Sets
Different display monitor calibration projects can be uploaded to each group of displays allowing quick and easy switching between different calibration settings without the need to re-calibrate each display.
A Summary window shows the results of the calibration and the measurement data. This allows for detailed logging and reporting of the calibration procedure.
NEC Display Wall Calibrator provides many features and options that make it flexible enough to be used in a large variety of video applications, including "on set" use in TV studios and full DICOM support for medical imaging.
Colorimeter function
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.
Video wall sizes from a 1x1 single display, up to 100 displays or up to 30 rows or columns.

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