Mitsubishi Electric MDT421S Instruction Manual

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.

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.

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.

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.

Image Persistence (Short- and Long-term)

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).

Image Staining

The following tips are designed to help users minimise the risk of image persistence and image staining, and secure use of

LCD public displays for as long as possible.

When an on-screen window is

displayed for a long period, image

persistence may occur at the window edges.

Shift the position of windows

regularly;

that is, avoid displaying windows in the

same position on the screen.

On-screen window

(there are high-contrast areas at the window edges)

High-brightness and low-brightness

patterns placed side-by-side

Image with a gray background

When simultaneously displayed patterns

have significantly different brightness

levels, image persistence may occur at

the boundary line between the patterns.

Avoid placing these kinds of display

contents side-by-side.

Image staining and image persis-

tence tend to stand out on a gray

background. Avoid excess use of gray,

and where possible use primary colours

for the background.

Recommended Usage / Settings / Conditions*1

1) Switch off LCD public displays when they are not in use.

2) Reduce brightness as much as possible

3) Reduce operating temperature as much as required (e.g., room temperature)

4) Use the screensaver function and/or the power saving mode

Recommendations for Content Design:

We recommend design content comprised mainly of moving images. When displaying static images, insert moving

images at appropriate intervals as a means to refresh the liquid-crystal materials. For the screensaver image, use a

moving image or fully black pattern:

2) Change the background pattern and letter-colours regularly:

3) Refresh images such as company logos and those with letters at regular intervals:

Examples of Problematic Content Design:

Tips for Long-term Use of LCD Public Displays

*1 For details regarding installation conditions, please refer to the user manual of the relevant model.

(Insert moving pictures such as promotional videos)

JOYLINE

FIRST AIR

JN 123

JN 476

FA 077

KANSAI

NARITA

KOMAKI

07 : 30

07 : 15

07 : 50

27 May 7:05

JOYLINE

FIRST AIR

JN 123

JN 476

FA 077

KANSAI

NARITA

KOMAKI

07 : 30

07 : 15

07 : 50

27 May 7:05

JOYLINE

FIRST AIR

JN 123

JN 476

FA 077

KANSAI

NARITA

KOMAKI

07 : 30

07 : 15

07 : 50

27 May 7:05

JOYLINE

FIRST AIR

JN 123

JN 476

FA 077

KANSAI

NARITA

KOMAKI

07 : 30

07 : 15

07 : 50

27 May 7:05

123

JOYLINE JN 123

NARITA 07 : 15

JOYLINE JN 476

KANSAI 07 : 30

FIRST AIR

FA 077

KOMAKI

07 : 50

27 May 7:05

JOYLINE

FIRST AIR

JN 123

JN 476

FA 077

KANSAI

NARITA

KOMAKI

07 : 30

07 : 15

07 : 50

27 May 7:05

348 Victoria Rd Rydalmere, NSW 2116 Phone: (02) 9684 7777 Fax: (02) 9684 7208

www.MitsubishiElectric.com.au

MITSUBISHI ELECTRIC AUSTRALIA PTY LTD

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