Table of Contents
Advertisement
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.
• 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
• 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.
• Set the PDP TV to a "Move Screen" display.
Move Screen function works to reduce image retention when displaying images on the four corners, such as TV station logos and
clock display.
(Settings can be made using Move Screen from Function MENU shown on
• 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 PIP 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.
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. A
Fig. B
33 .)
Fig. a
Fig. b
9
Advertisement
Table of Contents
