Loading ...
Loading ...
Loading ...
8
IMAGE RETENTION OF PLASMA DISPLAY
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 will
never burn.
The degree of image retention is proportional to the brightness of the characters and figures
displayed as well as the display time.
[Fig. A] [Fig. a]
• 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.
* 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
We recommend that you use the screen saver functions .
Notes
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.
[Fig. B] [Fig. b]
3U81641A [E] P08 9/16/05, 7:25 PM8
42PD380TA-P1
HITACHI
Loading ...
Loading ...
Loading ...