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10 | NEC DISPLAY WALL CALIBRATOR - USER’S GUIDE

Chapter

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 nd 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) if supported by the display model.

Once all of the displays have been measured, the calibration Target can be calculated. This Target denes 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 conguration 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 congured, 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. Always

allow the displays at least 30 minutes after powering on to warm up before attempting to measure or calibrate.

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NEC Display Wall Calibrator Guía de usuario Pagina 10