LCD Screens for Commuter Trains (Metro) and
Railway Stations
Large LCD screens can be found on the train, at the railway station and in
railway control rooms. Recently, January 9, 2009, the Indian Western
Railways announced that they will install 4,000 large panel LCD screens in
67 trains. The LCD screens will be installed by an OOH media company
who will earn revenue from the advertisement on the screens and Western
Railways will get a license fee of Rs 7 Crore (approx. US$1.75M) per year
for the duration of the contract (which is 5 years). These LCD screens will
play a mix of entertainment, information and advertising for 18 hours a day
in all trains. LCD screens can also be found in the railway stations.
Trivandrum Central, the biggest railway station in the state of Kerala in
India, is considered “swanky” by most visitors as a result LCD flat screen
televisions contributing to the overall look and feel.
However the LCD display needs for these railway displays are usually
similar. Below we outline key needs of LCD screens for railways:
Price: Price is an important criteria however many OOH media companies,
to their detriment, usually buy the cheapest LCD screen available for a given
format size. Railways require rugged closed LCD displays. Buying cheap
LCD displays or LCD TVs which are not closed boxes, may result in
premature failure of the screen.
Ruggedness and 24x7 Operation Capability: LCD screens for railways
need to be rugged. For this reason, it is important to have LCD informational
displays vs. LCD TVs as LCD informational displays are fan-less closed box
units that can offer protection from dust and other contaminants. Further
LCD informational displays are made for 24x7 operation while LCD TVs
are made for limited viewing. Ruggedness and life of the LCD screen is very
important to reduce failures of the LCD screens. LCD failures will cause
inconvenience to passengers and may disrupt traffic flow at railway staions.
Network Capability: Be sure that the LCD screen has RS-232 and LAN
network connectivity. The network connectivity allows for remote
monitoring of the various LCD screens. Alarms can be set if an LCD screen
is switched off or if it is not working. Power and other controls can be
monitored remotely. For example, an energy saving feature can be activated

so that when there is no signal, a power save mode is activated to reduce the
brightness of the LCD backlight.
Picture Quality: Most large LCDs are high definition. High definition
LCDs provide better picture resolution, better contrast ratio, high brightness,
high colour reproduction and fast response time resulting in better picture
clarity. High definition, high brightness and high contrast ratio are important
features for LCDs to have in railway environment for easy picture viewing.
Further, the non glare feature of LCDs allows for easy viewing in ambient
light or where there is background light being reflected on the screen. Most
new LCDs have 176° viewing angle, making it easy for viewing. Check the
viewing specifications to make sure meets your quality requirements
Slow-scan (legacy) Signal Capability: If the LCD screens are being
installed in the old chassis of the old CRT television or in a mixed network
of CRT televisions and LCD displays, the LCD screen needs to be slow-scan
legacy signal compatible.
New LCD screen features are continuously emerging. Check with the LCD
screen manufacturer to learn about new features. Read other articles and
make the right decision for your LCD purchase.