Originally Posted by matte79
Asked Pioneer Sweden and they forwarden my question about this to belgium.
They forwarded it to Pioneer Japan.
Finally this is the answer,,
The plasma drive technology used in the KURO panels enabled Pioneer to
achieve a significant reduction in black levels with improved picture
quality. A slight colour difference may be visible when watching TV in a
very dark environment. This slight colour difference has existed with most
if not all plasmas, including the earlier Pioneer models although it was
not as noticeable due to the higher black level as the KURO models.
Since the KURO models have been designed to have a much lower black level,
slight colour differences can be noticed over a period of time. This is
because plasma panels use 3 different coloured phosphors, red, green and
blue. Each phosphor has slightly different light emission characteristics
which change overtime. Since the change of the red phosphor is relatively
mild, the picture could appear to become warmer in colour. The panel
automatically corrects this change when displaying general moving images.
Any pictures appearing warmer in colour, when viewing dark images in a very
dark environment, is a result of the light emission characteristic of the 3
different coloured phosphors, and is not regarded as a fault. This is
unnoticeable in normal viewing conditions.