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10. Operating Acuras
Overview
• Preconditions
• Gray Level Correction
• Acuras Capture
• Acuras Realignment
• Undoing an Acuras realignment
• Restoring the white uniformity factory settings
• Deleting Acuras realignment data
10.1 Preconditions
About this section
It is important to know the behavior of Acuras Capture and Realignment features prior to start operating it. This section lists the
limits and provides useful information about some features like CLO regression.
Before you start operating Acuras, it is crucial to have good understanding of the following items (see XDS RACU User guide
R59770508):
• Dynacolor
• Light output
- Golden Alignments
- Aperture control (ECR tansmission)
- Dimmer control (CLO target, dimmer transmission)
-TODcontrol
•Grayscale.
Overview
• CLO regression principle
• Conditions for Acuras Capture and Realign
10.1.1 CLO regression principle
Introduction
During the lifetime of a lamp, the light output of the projector gradually drops. By the end of its lifetime, the lamp may have
dropped to 50% of its initial value. The lumen maintenance curve is slightly different for each lamp.
To guarantee a constant light output over a period of time, we can limit the light output of each projector of a display system to a
value which is lower than the highest light output of the weakest projector by using the projectors’ dimmers (i.e. enabling CLO and
setting a CLO target ina Golden Alignment). While the light output ofa lamp is decreasing, the dimmer transmission is automatically
increased to compensate for this.
Make sure that the CLO feature of each projector is activated.
At a certain time, the dimmer transmission of one projector reaches 100%. From that time on, this projector is not able to meet the
CLO target any longer and its image becomes dimmer than the other channels.
If now an Acuras realign is performed, the CLO target of each projector is decreased by 10% and a dialog box pops up to ask if
you accept the reduced target as it is currently presented to you. In the case where a CLO target drop of 10% is not enough and
still one projector can not meet its reduced CLO target, again all CLO targets will be lowered by 10% until all projectors can achieve
their individual CLO target.
Image 10-2
Realign: reduced targets dialog box
If the reduced target has been accepted by the operator, the dimmer will again be able to compensate for further lamp light output
recession during the next period of time.
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