Eyevis EYE-LCD4600-SN Series, Руководство пользователя

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EYE-LCD4600M/W-SN 47
7.5 Integrated Security Features of the EYE-LCDM/W Series
) PSS (Panel-Security-System):
The displays provide a range of security functions for long-term operation to
avoid so called “image sticking“-effects (e.g. “Line Move” and the “Power Save
Regeneration”).
) PSC (Panel-Self-Control):
Includes functions like panel dimming, automatic adjustment of temperature and ventilation and emergency
cut-out to protect the equipment.
) Displaying static images
What certainly applies to all types of LCD displays is the fact that the more dynamic the image content the lower
is the risk of memory effects. A moving image would be ideal. Displays that are used for the representation
of moving images do not need special protection measures against memory effects. Moving images means a
movement of the complete display content not only movement of the displayed content in a certain area of the
display.
If you want to or if you have to display static images we advise to re-arrange the display content several times
per day. When re-arranging the images, please keep in mind to change the images with images that do not
have similar content. For example, if you have two displays showing a map of Germany with different items of
information on them, it makes no sense to interchange these two maps on the displays, since the both images
have a congruent background using the same pixels. A memory effect will occur rather soon with these images.
) Removing “Image Retention“-Effects
If image retention has caused ghost images on your display the fastest way to transfer the electric rest voltage
from the LCD modules to the liquid crystal solution is to represent a screen-filling completely black or white
image on the display. It is also possible to transfer the voltage back to the liquid crystal solution by switching the
device off. In many cases image retention effects are only visible if the background image has a low brightness
level. The visibility of a luminescent image or a shadow can be reduced by choosing a brighter background. The
use of complementary colours does also reduce the risk of image retention and should be applied as often as
possible.
) Image Sticking
Image Sticking is the resistant form of image retention. If shadow images or luminescent images are not
removed for longer periods the electric voltage accumulates as ionic clusters inside the LCD modules. This kind
of effect that is most likely to happen at image borders with a high contrast, as between white and black areas, is
irreversible. Therefore it is very important to follow the advice given to avoid image retention, so image sticking
can not occur at all.
) Avoid prolonged presentation of static pictures
The best way to avoid image sticking is to prevent the prolonged presentation of static images on the screen.
Try not to display the same static image on a LCD panel for more then 2 hours when working at normal ambient
temperature. However, some manufactures recommend reducing this to as little as 30 minutes when working in
an elevated temperature environment (above 95 deg. Fahrenheit or 35 deg. Celsius). Make use of a dynamically
changing screen saver and adjust its settings accordingly.
Some applications do realize that prolonged presentation of those vertical or horizontal grey or black bars, say
when viewing 4:3 program content over a wide-screen LCD panel, is also a form of semi-static image. These
should be avoided by choosing an aspect ratio or zoom setting that expands the image to fill the entire screen.
Similarly, try not to freeze a picture on your LCD for too long, nor allow station logos, program menus, etc., to
remain still on the screen for an extended period. If for some reason, you need to pause a film or any other video
frame, it is better to turn off your LCD. Finally you should always power down the display panel during periods of
inactivity.
The PSS functions enable time-scheduled
and automatic inversion of the colours of
the input signal.