3.12.
Multiple Unit
VP-794 when operated
it’s Projector or LED modes and in the default ‘multiple unit’ configuration (not
PIP) it has a Multiple Unit menu. This is to set up each unit for use in a multi screen application.
Multiple screens are stitched together to provide a bigger display with higher resolution than a single
display.
Each display is driven by a separate VP-794 unit.
In a multi projection display the individual projections typically are chosen to overlap to give seamless
transitions. Multiple LED videowalls or LCD and Plasma screens do not have overlapping regions. The
Blend Width is set to zero..
Important: When using multiple VP-794 units to drive one single large screen, it is essential that all VP-
794 units are I/O locked, otherwise motion tear will be observed at the boundaries of the image
processed by each VP-794 unit. It is also essential that all VP-794 units are setup for the same
processing latency (either all units are in Best Picture mode or all units are in Low Latency mode).
The processors in a multi screen system application can be used in two ways
1/ Auto zoom on:- processers cut out the specified section of the image and scale this section to fill the
projected area.
2/ Auto zoom off:- processors do not cut the image, the correct portion of the image including
overlapping blend region must be supplied to each processor independently.
When using the Auto Zoom function explained below, each VP-794 unit gets the same graphics or video
input signal through a distribution amplifier. The VP-794 unit cuts out and resizes the image to display
the part of the image assigned to the corresponding screen.
In a
multi projection
display the individual projections typically are chosen to overlap to give seamless
transitions.
Overlapping regions are illuminated by multiple projectors and are brighter than non-overlapping
regions. These can be Soft Edge Blended for a uniform brightness over the total display the brightness
in the overlapping regions has to be reduced electronically.
Important: When using multiple VP-794 units to drive one single large screen, it is essential that all VP-
794 units are I/O locked, otherwise motion tear will be observed at the boundaries of the image
processed by each VP-794 unit. It is also essential that all VP-794 units are setup for the same
processing latency (for example, either all units are in Best Picture mode or all units are in Low Latency
mode).
3.12.1.
Auto Zoom
Available settings: ON, OFF
Switches on the auto zoom resizing the video image to display the assigned part of the total image.
The default is AutoZoom is OFF
When Auto zoom is turned ON the processor will cut and scale the portion of the picture selected by the
matrix size and position selected
– described below
Note The menu is scaled by the warp engine and may exceed the size of the screen. Also, only the
active video area can be used for the on-screen menu. This would crop the menu and make it
impossible to navigate. In this case auto zoom is deactivated and a message will indicate such
situations. After changes are made to correct the situation AutoZoom can be reactivated.
3.12.2.
Units Wide and Units High
Settings: 1, 2, 3, 4 and 1, 2, 3, 4 for the maximum matrix size of 16
Provides the VP-794 unit information of the multi screen installation. The number of horizontally and
vertically installed screens or projectors is entered.
Note: This function can be used in conjunction with the item below to select the blend regions to be
provided even when auto zoom is turned off
