Marantz PD4292D - Manual (Page 4)

PDP Monitor burning characteristics
Regarding the subject titled, we hereby furnish you with the
following report:
1. Burning
The fluorescent substance used in the plasma module loses
its brightness with the lapse of lighting time.
This deterioration in brightness appears to be a difference
in brightness in relation to the surroundings, and comes to
be recognized as burning.
In other words, the burning is defined as follows: when the
same pattern (of the fixed display) is displayed for a long
time, a difference in brightness is caused around the lighting
area and non-lighting area due to deterioration in the
fluorescent substance. When the present pattern is changed
over to another one, the boundary comes to be seen between
the lighting area and non-lighting area due to difference in
brightness in the pattern shown shortly before changeover.
If this condition is accumulated, the boundary or burning
comes to be seen with the naked eyes.
2. Secular change in brightness
The life of brightness, defined as the reduction to half the
initial level, is more than10 thousand hours on average.
Conditions: All white (100% white) input at an ambient
temperature of 25
°
C.
However, this life time is not a guarantee value for life and
brightness. It should be recognized simply as the data for
reference.
3. Warranty period
Burning and faults in brightness and picture elements are
excluded from the warranty objects.
4. Cause of deterioration in brightness
A major possible cause of deterioration in brightness is
damage in the fluorescent substance due to impact caused
by ions generated at the time of plasma discharges.
5. Practical value for burning
The deterioration in brightness tends to be accelerated up
to 100 hours in the initial period. In the initial period, the
fixed display of patterns particularly tends to cause burning.
The practical value for burning is difficult to define in
concrete numerals. As described below, you are advised to
take proper measures to make the occurrence of burning
as slow as possible.
6. Proposed measures taken to relieve burning
So long as there is the reduction of brightness in the
fluorescent substance, it is impossible to avoid the
occurrence of burning. Therefore, to relieve burning, we
offer you a method of entering an image input that may
ensure reluctance to the generation of the difference in
brightness reduction among the displayed dots.
The images from TV broadcasting involve a high rate of
motion picture displays.
Therefore, there is less chance of being a cause of difference
in brightness reduction among the cells. Even when the
fixed patterns are displayed, they generally last for a few
minutes. Since the same pattern is less liable to be displayed,
there is almost no influence toward burning.
If the fixed patterns tend to be displayed for a long time,
however, there occurs a substantial imbalance between the
lighting and non-lighting areas, thus causing a difference
in brightness as a result. In this paper, we offer you some
proposals of installation, paying attentions to the two points:
the reduction of difference in brightness achieved by
integrated lighting time leveling and the method of edge
smearing to make burning hard to be discerned.
The result from these proposals can, however, greatly
depend on the contents of images and the operating
environment. Therefore, we consider that it is essential to
take the suitable measures in consideration of the customer’s
operating environment.
Example of Proposal 1: The display position is moved
while the fixed display pattern is
changed over, or it is scrolled during
the display.
Example of Proposal 2: If possible, a pattern of
complementary color is
incorporated (for integrated time
leveling).
Example of Proposal 3: The fixed pattern and the motion
picture display are reciprocally
exchanged, in order to minimize the
display period of the fixed pattern.
Example of Proposal 4: During operation, the brightness
of screen is suppressed as low as
possible. For the display patterns,
characters are indicated not on the
black ground (non-picture area) but
on the colored ground (mixture of
R, G, B recommended).
7. Proposed countermeasures for the plasma module
Since the PDP is a display that uses a fluorescent substance
like the CRT, it is a fundamental phenomenon that burning
occurs. Unlike the CRT, the PDP gives rise to deterioration
in the fluorescent substance due to impact caused by ions
generated during plasma display.
As a result of the above-mentioned improvements, it is
possible to extend the PDP lifetime and relieve the effect
of burning, but is impossible to realize the complete
elimination of burning so far as a fixed pattern is displayed
for a long time.
PD4292D-1 00.10.4, 3:08 PM 4