The Echo Light System displays visual media content on the surroundings of metro and subway trains, as the trains travel through the tunnels, with the use of a projector installed on the side of the train, so it can be viewed by the passengers of the train outside the windows of the train.

The central server sends data for the media to be broadcasted through a wireless internet connection to a local server aboard the train carriage.

The local server distributes the visual data to the projectors, and the audio is transmitted through a wireless transmitter so that it can be received by the passengers, with the use of their personal electronic devices.

The On/Off sensors are used to control the On/Off status of the projectors. Tags are used to localize the train and with the input of the server, and so the Echo Light System can show content based on the time, location and destination of the train.


It is very easy to implement, update and maintain, and the implementation, maintenance and updates can be done outside the tunnels, without delaying traffic. It does not create traffic delays when implemented, maintained or when updated.

The product of competitors relies on a physical implementation of a LCD screen, poster etc. on the tunnel walls inside the tunnel system, creating delays and hazards, both when implementing, maintaining and in some cases even when updating.

Furthermore covering the metro tunnel walls with poster, LCD screens etc., can be a nest place for insects and other pests.

Also the covering of the tunnel wall can cause failure to discover damage or a necessary repairing of tunnel wall and foundation. Our solution is much more flexible, and has features which competitors don't; like the ability to play audio to passengers using their personal electronic devices, without disturbing other passengers.

Most competitors can't play the audio associated with the images.

The Echo Light System can project media throughout an entire metro/subway tunnel network, thus allowing the use of the full potential of the metro/subway for advertising and commercial media broadcast.

Since the competitors are relying on the assembly of screens or other physical things inside the tunnel walls, they can only implement their systems on short stretches, and it is a very difficult and dangerous task, where all traffic needs to be stopped.

Echo Light is a low cost system, with very little maintenance and a high revenue potential.

The Echo Light system's cabinet projectors can be installed either inside or outside the train, and is adapted to the specific design of the train, making it an easy process to implement. It does not require much space to facilitate the Echo Light System on the metro trains, as the cabinet projectors are specially designed to take up as little space as possible, including the sub components such as local servers etc.

It should be emphasized that the Echo Light System's unique solution neither create traffic delays in implementation, maintenance, repairs, updates or any other similar aspect, since this work will be done outside the tunnels.

This enhances the safety of both passengers as well as the technical staff that will perform the work related to the Echo Light System.

The Echo Light System's projectors need a rare replacement, and it is done easily, and the entire process takes an estimated 15 minutes.

The Echo Light System uses LED projectors with minimum 20,000 hours lamp life and low power consumption. Echo Light brightens up the dark tunnels and sheds a beautiful light on the surroundings of the trains, allowing passengers to view the media content from their comfortable seat in the metro subway, at the same time generating revenue for the subway and metro operators in currently unused areas.

It might be obvious but still worth to mention that most metro subway networks are in densely populated areas, and therefore the currently unused media space the Echo Light System creates is of high value.

Simplified Communication Map of System