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There are different characteristics that result in panel image retention depending on how the plasma display is used.
Situations and effective usage methods related to ghosting are provided below.
Image retention
characteristics
of a plasma display
The image retention phenomenon of a plasma panel occurs due to partial phosphor degradation arising from partial character and figure
display.
For example,
when the character
image
as shown in Fig. A at the right is
continuously
displayed
for a long period
of time, the only part of the phosphor
(Red,Green,
Blue) that will degrade
will be the color of the applicable
character
display
portion.
Consequently,
when a white image
is displayed
on the entire
screen
as shown
in Fig. a, the character
marks
displayed
up to that time will
become
a color difference
visible
to the eye, but the phosphor
wNI never burn.
[Fig. A]
i
:
[Fig. al
I
C5
Z
_d
raThe degree
of image retention
is proportional
to the brightness
of the characters
and figures
displayed
as well as the display
time.
• The tendency
of the phosphor
is to degrade
more the brighter
the characters
and figures
are displayed.
When
images of figures
with different
levels of
brightness,
as shown in Fig. B, are continuously
displayed
for a long period
of
time, it becomes
easier
for image marks
at locations
when the brighter
figures
are displayed
to be noticeable.
[Fig. B]
i_iiii,%iiitliiiiiiiiiiiiiiiiiiii_iiiiiiiii
[Fig.
b]
* The image
retention
images
in this document
are exaggerated
for the purpose
of explanation.
The actual manner
in which the image
retention
is seen differs
depending
on the operation
time and brightness.
Methods
to Reduce
the Occurrence
of
Image
Retention
• Lower the Contrast
and Brightness
settings
of the plasma
display
as much as possible.
A function
is provided
in the display
that controls
the brightness
of the screen to reduce
degradation
of the panel.
Using this function
makes
it
possible
to reduce
image retention.
(Refer
to Panel Life (Extend
1.or Extend
2 shown on _:i_
)
• Set the plasma
monitor to an "Screen
Wipe"
or "Inverse"
display.
The occurrence
of image
retention
when displaying
images
of identical
patterns,
such
as static images,
for long periods
of time can be
reduced
by displaying
a reversed
color or completely
white screen for about
1 - 2 hours after terminating
the display.
(Settings
can be made using Screen
Wipe and Inverse
of Function
MENU
shown on I-2_31 )
• Using
in combination
with moving
images
Since the degradation
of the fluorescent
material
progresses
comparatively
uniform for moving
images,
the occurrence
of partial
image
retention
can be controlled.
We recommend
to use in combination
with moving
images
such as a DVD.
* Please be careful
since image
retention
will occur
if display
is left in a two screen
display
state for a long period
of time.
* Television
broadcasts
include
images
displayed
for long periods
of time in which
the left and right or top and bottom
of the image are cut and
broadcast
station
name or time are displayed
for a long period
of time at the same
portion
of the screen.
Image
retention
in these
portions
can
be expected
to occur,
so please
be aware.
About
screen
defects
• High precision
technology
is used in the making
of plasma
panels
but there may be dark spots (points that do not illuminate)
and bright
spots
(points
that are too bright)
in some
cases. These
do not indicate
a malfunction.
About residual images
• In some cases, residual images may remain after the short-term display of still images and another image is displayed, but these will
disappear and return to normalcy. This is not a malfunction.
About the panel screen
• Plasma displays display images by means of electrical discharges inside the panel. Because of this, the temperature of the panel surface may
rise in some cases.Also, plasma displays are made of finely processed glass. A reinforced glass filter is installed over the panel surface but
avoid strong impact because there is still danger of glass breakage.
27
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