Bedienungsanleitung Hitachi 42PD7300TA (Seite 9 von 43) (Englisch)

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ENGLISH

MAGE RETENTION OF PLASMA DISPLA

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 r

etention phenomenon of a plasma panel occurs due to par

tial phosphor degradation arising fr

om par

tial character and

figur

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, Gr

een, Blue) that will degrade will be

the color of the applicable character display por

tion.

Consequently

, when a white image is displayed on the entir

scr

een as shown in Fig. a, the character marks displayed up to

that time will

become a color dif

fer

ence visible to the eye, but the

phosphor will never bur

Fig. A Fig. a

■

The degree of image retention is pr

opor

tional 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 figur

es ar

e displayed. When

images of figures with dif

ferent levels of brightness, as

shown in Fig. B, ar

e continuously displayed for a long

period

of time, it becomes easier for image marks at

locations when the brighter

figur

es ar

e displayed to be

noticeable.

Fig. B Fig. b

* The image r

etention images in this document are exaggerated for the purpose of explanation. The actual manner in which the im

age

etention

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 pr

ovided in the display that contr

ols the brightness of the scr

een to r

educe degradation of the panel. Using this

function

makes it

possible to reduce image r

etention.

• Set the PDP TV to a

“Move Screen” display

Move Screen

function

works to r

educe image r

etention when displaying images on the four corners, such as TV station logos and

clock display

(Settings can be made using

Move Screen

om Function MENU shown on

31 .)

• Using in combination with moving images

Since the degradation of the fluorescent material pr

ogr

esses comparatively unifor

m for moving images, the occurr

nce of par

tial

image

etention can be contr

olled. We r

ecommend to use in combination with moving images such as a DVD.

* Please be car

eful since image retention will occur if display is left in PIP display state for a long period of time

elevision br

oadcasts include images displayed for long periods of time in which the left and right or top and bottom of the

image

e cut and br

oadcast station name or time ar

e displayed for a long period of time at the same portion of the screen. Image r

etention

in these

portions can be expected to occur

, so please be awar

Notes

About screen defects

•

High pr

ecision 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, r

esidual images may r

emain after the short-ter

m display of still images and another image is displayed, but

ese will

disappear and r

eturn to nor

malcy

. 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 pa

nel

sur

face

may rise in some cases. Also, plasma displays are made of finely pr

ocessed glass. A r

einfor

ced glass filter is installed over

the panel sur

face but avoid strong impact because ther

e is still danger of glass breakage.

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