Background information 24
be thicker in the center.
BARCO has developed a special system, called
Luminance Uniformity Correction (LUC), that
solves this problem. The LUC system enhances
the light output at the edges of the CRT, so that
the luminance there is the same as in the center.
The LUC system is calibrated in the factory. From
time to time, it has to be re-calibrated at the
customer's site by means of the light sensor you
use for normal color calibration. The system can
be calibrated and switched on or off by a qualified
technician.
Power saving system The display is equipped with circuits that can
handle power saving management. When the
system is switched on, it can power down the
display in several steps.
The system is controlled by the imaging board or
the PC that delivers the video signals. When you
are working on the computer, the imaging board
delivers both sync signals, and the display is
operating normally. When you don't touch the
computer keyboard for a certain time, the imaging
board only delivers vertical sync. This is sensed
by the display's micro controller, that blanks the
image on the CRT. This results in a drop of power
consumption with about 30 %.
When you leave the computer idle for a longer
period, the imaging board now delivers horizontal
sync only. As a result, the display's micro
controller switches off a number of internal
circuits. The power consumption has now
dropped with about 35 %.
At last, the imaging board delivers no sync
signals at all, and the micro-controller switches off
all but one power supplies in the display. Only the
micro-controller's own supply keeps on running,
resulting in a very low power consumption of 5 W.
If you start using the computer again, the imaging
board switches on both sync signals, and the
micro-controller switches on the display.
The times after which the different steps of power
management must become active, is set in the
PC's display properties.