User`s manual

doc-3331-2 OverView cDG67-DL (August 2003) 6-16
6.7 Brightn ess Menu
This menu refers to the optical dimmer and can be enabled or disabled.
If grayed out, it has to be enabled by a Barco service technician.
6.7.1 Brightn ess Correction (%)
Brightness Correction (%) Top 4
Set Brightness..
Brightness
OverView DG
Operation
Lamps Status
Figure 6-26
Brightness menu, Brightness correction
Display Walls consisting of OVERVIEW CDG67-DL projection modules are adjusted to homogene-
ous brightness. All projectors are individually adjusted to feature this common brightness.
This individual projector adjustment is done after set up of the Display Wall by the Barco Support
Technicians. On the screen, the brightness is measured by means of a lux meter, and the sensor of
the optical dimmer (
DIS) is calibrated based on this measurement.
This calibration is done for both lamps.
If in spite of this adjustment the user considers the projection module too dark or too bright, he can
modify this brightness by correcting the
DIS calibration value by ± 30%.
This correction can be done via the command
Brightness|Brightness Correction (%). This menu
entry refers to the currently active lamp which is automatically indicated in the menu entry.
To modify the brightness of a projection module, proceed as follows:
 Use the cursor key to highlight Brightness Correction (%) Top/Bottom
 Press
Enter to select.
The following dialog is displayed to modify the correction value. The actual correction values and
the DIS value are indicated.
Brightness Correction (%)-Top
DIS Value
+0,0
277
4
4
Figure 6-27
dialog to modify the correction value
To increase the percentage, proceed as follows:
 User the cursor key to activate the right white arrow 4
 Click on the right white arrow until the desired percentage is reached.
To decrease the percentage, proceed as follows:
 User the cursor key to activate the left white arrow 3
 Click on the left white arrow until the desired percentage is reached.
The indicated DIS value does not change but remains constant.
Modification of the correction value has impact on the calibration of the DIS sensor,
not on the absolute value which has to be the same for all projection modules of the
Display Wall.
Due to the change in calibration, the brightness is adjusted while the common (all
projection modules of the Display Wall) DIS value persists.