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15 | NEC DISPLAY WALL CALIBRATOR - USER’S GUIDE

Contrast Ratio

The Contrast Ratio of the display is the ratio of the measured Intensity to the measured Black Level. The Black Level

is the luminance or “brightness” of black when displayed on the screen. For LCD monitors the minimum or native Black

Level is typically xed in ratio to the Intensity value due to the display technology.

NEC Display Wall Calibrator allows the Contrast Ratio to be selected for applications that require a specic contrast

ratio. However the calibrated contrast ratio can not be higher than the native contrast ratio, since the minimum Black

Level that the display can achieve is limited by the display technology.

The Contrast Ratio is adjusted (reduced) by increasing the black level as necessary.

For most applications the highest possible Contrast Ratio is most suitable and can be achieved by selecting Monitor

Default as the Contrast Ratio.

Specic Contrast Ratios in the range 50:1 to 500:1 can be selected.

Note: If the selected contrast ratio is higher than what the display is actually capable of achieving, then the display will calibrate

to the highest possible contrast ratio. For example if 500:1 is selected, but the display is only capable of say 320:1 with the

current Target settings, then the resulting calibration will have a contrast ratio of 320:1.

Calibration Steps

The display calibration process for a video wall when matching both the Intensity and White Point is outlined in the

following steps:

1. Initializing Displays - This step resets each display to the default color settings so that the “native” performance

of each display can be measured before the calibration. Settings such as the Brightness, Color mode, Contrast etc.

will be reset.

2. Measuring Displays - During this step, all displays are measured to determine the default “native” color characteristics

of each display. This step involves placing the color sensor on the screen while various test patterns are displayed

and measured. This step repeated for all displays in the video wall.

3. Target Calculation - Once all of the displays have been measured the software will automatically calculate the

maximum possible Intensity that will give a color match with all the displays. This is done by determining the

dimmest display in the video wall at the chosen White Point.

4. Calibrating Displays - Once the Target has been calculated, all of the displays can be calibrated. This step involves

placing the color sensor on the screen while various test patterns are displayed and the display is adjusted. This step

repeated for all displays in the video wall.

5. Visual Trim (ne tune by eye) - If necessary, the white point and brightness of any of the displays can be ne tuned

visually by using the software.

Note: When calibrating to a Target that uses either Maximum Possible Per Display or Specic Level option for the Intensity,

steps 2 and 3 are optional because it is not necessary to measure and calculate the matching Target value.

However if Specic Level is used, performing steps 2 and 3 will allow the software to verify that each display is capable of

achieving the specied Intensity value at the selected White Point. If a display can not achieve this, then a yellow warning

icon is shown in both the Summary window, and in the main display window for that particular display.

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NEC Display Wall Calibrator Guia do Utilizador Página 15