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| NEC Display Wall Calibrator - UsEr's GUiDE
1
introduction to NEC Display Wall Calibrator
Overview
The aim of the NEC Display Wall Calibrator system is to 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.
The time until the displays need to be re-calibrated will depend on many factors such as the environment and
duration they are used, the age of the displays, the calibration Target settings used, and how critical the color
matching requirements are. Newer displays will tend to drift more rapidly than displays that have been in use for
several days or weeks.
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