Akai PDP42Z5TA Service Manual page 128

Product Specification of 42XGA PDP Module
Proposed measures taken to relieve image sticking
So long as there is the reduction of brightness in the fluorescent substance, it is impossible to avoid
the occurrence of image sticking. Therefore, to relieve image sticking, 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 image sticking.
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 document, 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 image sticking 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 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).
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