Pioneer PDP-V401 Field Service Manual page 14

PDP-V402
GENERAL INFORMATION
DIAGNOSIS
BURN-IN PROBLEM
Definition of burn-in
One dot consists of red (R), green (G), and blue (B) phosphors on
plasma display as on CRT. The luminance of each phosphor
deteriorates depending on the cumulative light emission time. The
unbalance of deterioration among the phosphors causes burn-in.
7 Tendency and Comparison of Burn-In
Tendency of burn-in
On our plasma display, the blue phosphor deteriorates comparatively
earlier than the other two types of phosphors. A burnt area tends to
be yellow.
Comparison with PTV
The tendency of burn-in can be compared between PDP-V402 and
PTV as follows:
¶ A burnt area tends to be yellow in PDP-V402 and PTV.
¶ PDP-V402 shows a lower level of burn-in (inconspicuous) than
PTV at high-intensity display.
¶ At low-level display, however, burn-in is slightly more
conspicuous on PDP-V402 than on PTV.
¶ Despite the differences of tendency, the level of burn-in is about
equal between PDP-V402 and PTV.
7 Prevention or Easing of Burn-In
1. For static display, it is recommended to give priority to red and
green. Avoid static display that partially contains blue peaks.
2. Avoid keeping static display for a long time. Switch static and
dynamic displays as frequently as possible.
3. After static display, use dynamic display three to five times
longer than the static image display.
4. When using static display, vary the pattern to avoid burn-in.
5. For static display, use a screen saver not to keep the same pattern
for a long.
6. When using static display for a long time, set the white balance
as close to yellow as possible (minimize the blue level) in
integrator mode to make burn-in inconspicuous.
Afterimage
PDP is also subject to the problem of afterimage whose symptoms
are close to those of burn-in. Afterimage is a phenomenon of a
residual static pattern that occurs if the display changes from a long-
time static image of a high intensity level to a low-intensity image.
Displaying a dynamic image for some time clears this phenomenon.
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7 Panel Burn-In Easing Method
PDP-V402 supports full-frame output in integrator mode.
When an image is burnt on the panel, full-frame output for
considerably long time may ease burn-in.
Full-frame Output Procedure
1. Press the MENU button then the STANDBY/ON button to start
up the device in integrator mode.
2. Select "ADDITIONAL SETUP" using the
P I CTURE PARAMETER
CONTRAST
BR I GHT.
COLOR
TINT
SHARPNESS
POSITION
I N I T.
WHITE BALANCE
ADDITIONAL SET UP
TOTAL INITIALIZE
(The above menu is when NTSC is
input to the VIDEO function.)
3. Select "FULL MASK" using the
key.
P I CTURE PARAMETER
WHITE BALANCE
ADDITIONAL SET UP
COLOR MODE
BAUD RATE
AUTO RGB2
NTSC MASK
FULL MASK
OSD
HOUR METER
TOTAL INITIALIZE
4. Select "WHITE" using the
Then the display immediately changes to the full-color mask
screen.
FULL MASK
EXIT
RED
GREEN
BLUE
YELLOW
MAGENTA
CYAN
WHITE
Note: OSD display is disabled during full-frame output. Turn the
power off using the STANDBY/ON key or press the SET
key to clear the screen.
14
± ≠
or key.
128
128
128
128
128
± ≠
or key and press the SET
1
4800BPS
OFF
BLACK
ON
12345
± ≠
or key and press the SET key.