Mitsubishi Electric MDT421S Operating Manuallines

LCD PUBLIC DISPLAY
Operational Guidelines Relating to 24/7 Usage of
Mitsubishi Electric LCD Public Displays
These operational guidelines provide information regarding 24/7 usage of our LCD public displays. They are
relevant to commercial applications such as flight information displays and digital signage boards where even 24/7
usage may be required. Our LCD public displays differ from consumer-grade television products in that they are
electrically and mechanically designed for heavy-use applications. Highly reliable LCD panels and electrical
components are used to secure sufficient durability for 24/7 usage. However, due to the characteristics of LCD
technology today, there are certain limitations in what Mitsubishi Electric can cover in product warranties. These
guidelines address this issue and support customers in long-term use of Mitsubishi Electric public displays.
Mitsubishi Electric Products Compatible with 24/7 Usage
The most critical concerns regarding 24/7 usage of LCD panels are image persistence and accelerated aging issues (e.g.,
loss or inconsistency of brightness and image staining). These issues are part of the current LCD technology and are
unavoidable at this stage. For this reason, Mitsubishi Electric cannot cover these issues in a warranty.
These guidelines provide tips to help users minimise the risk of these problems occurring and thereby prolong the service life of
LCD public displays. In particular, to minimise the risk of LCD panel deterioration, Mitsubishi Electric highly recommends an opera-
tional period of less than 18 hours per day for MDT Series products and less than 12 hours per day for LDT Series products.
* Please note that other factors apart from operational period can also affect the extent of LCD panel deterioration. For details, please refer to the user manual of the relevant model.
Image Persistence (Short- and Long-term)
After a static image is continuously displayed on a screen for a certain period, traces of the image may remain even after a
different image is displayed. This affect is known as short-term image persistence. One way of avoiding this is to switch off
LCD public displays as much as possible when they are not in use.
When static images are continuously displayed for even longer periods, it can result in long-term image persistence, which is
very difficult to remedy and may involve dark patterns remaining at the edges of letters or boundaries of objects.
Image Staining
Continuously displaying a certain image (particularly a static image) is likely to lead to accelerated aging issues such as
loss or inconsistency of brightness or image staining due to the effect of heat/light intensity from the backlight. Once image
staining occurs, LCD public displays cannot be restored to their original state. The affected area appears dark (inconsistent),
and there is a possibility that the staining will be visible regardless of the images displayed (static and/or moving).