Switch signage screens from your phone: cloud or offline

The short answer

To switch a screen from your phone while people are watching, you need a cloud player and a network connection at the screen. That is the only product category where the button on the phone reaches the display directly, in seconds. If the content is a fixed set of screens that play in order, say an animated logo, a leaders list, a countdown timer and a notice board, an offline player with the show on a card does the job. You correct the content when it actually changes, and the correction lands when you push it from a computer, when the player pulls it on its timer, or when you swap the card. Everything below is about where that line sits for your room.

Switching and updating are different jobs

The two get confused because both look like changing the screen. Keep them apart, because they need different equipment.

Switching is a decision made in the moment: the tournament timer goes up when the round starts, the leaders list comes back between rounds. The person making the call is on the floor with a phone, and the display has to obey in seconds.

Updating is a change to the content itself: last night's top earners replace the week-old list, a new games schedule replaces the old one. Nobody is standing in front of the screen waiting; the change can land minutes or hours later.

A cloud player with a phone app does both, because the app carries the switch command and the new files over the internet. An offline card player does only the second, on whatever update schedule you set. The wider tradeoffs between the two are in the offline and cloud signage guide; this page stays on the switching question.

Cloud player against offline card player

Both approaches put the same four screens on the wall. They differ in who touches the screen, and when.

The subscription row is the one people underestimate. A cloud plan runs for as long as the screens do, and it scales with the screen count. The offline player's software is included, and the only recurring task is the update itself.

Where a cloud player wins

On-demand switching is the whole case. If the room wants the timer screen up at the start of every round and different lists up between rounds, and the person running the floor holds the phone, a cloud player is the right tool. It also wins when several screens in different rooms take different content from one login, and when more than one person shares the updating. That shared-phone workflow is its own subject: managing digital signage content from a phone with several users. What it asks in return is a connection at every screen that holds for the session, and a subscription that renews for as long as the screens do.

Where an offline card player wins

A loop is the case. The screens play in order for the whole session, and the content itself changes a few times a week. An offline player runs that with no subscription and nothing in the room to maintain. Corrections still reach the screen, by three routes:

• Card swap. The player keeps a copy of the show in internal memory, so the current show carries on while the card is out and the swap adds no gap in playback.
• Push from a computer. The screen connects once to the free IMD Signage Studio app and then takes new shows from your computer.
• Timed pull from your own server. The player pulls a playlist from your web server on a timer. Set the timer to 15 minutes and a saved correction is on screen within 15 minutes at most.

No network in the room at all? A phone in your pocket can carry the update, as in updating an offline signage screen with a phone hotspot. And the question of when a pushed show should take over while the old one still plays is covered in when a playlist update should switch what is on screen.

What an offline screen from our range does

Our small screens for counters, shelves and endcaps, the small retail display range, run our free player, and the loop case is what they are built for. The documented behavior:

• Set the player as the home app and the show starts full screen at power-on, with no launcher and no keyboard.
• Images and MP4 video play from microSD or USB with no network connection.
• Playback survives a card swap, because a copy of the show sits in internal memory.
• Portrait or landscape is one rotation setting, so the same screen hangs either way.
• A daily on time and off time is built in. Outside those hours the screen shows black at minimum brightness, because the app cannot switch the backlight off.
• A hidden, PIN-protected staff menu lets your team reload a card or check the screen without opening the case.

The playlist autostart setup walks through the power-on part step by step, and choosing the first screen at startup covers making the logo the opening screen.

The line these screens will not cross: mid-session switching from a phone. They play in the order the playlist sets until a new show replaces them.

Scenario: one card room, four screens

A 10-table card room puts one display over the desk. The show holds four screens that play in order: the animated logo, the top earners list, the tournament round timer and tonight's games. The room sets the daily on time to 6:00 pm and the off time to 11:00 pm. Rounds run 15 minutes. The loop is trimmed so one full cycle takes 2 minutes, which puts the timer screen on the wall once every 2 minutes. Across one 15-minute round that is at least 7 appearances (15 ÷ 2 = 7.5, so 7 full appearances fit).

Event 1, 7:00 pm: the tournament starts and the manager wants the timer up now. On the offline loop the longest wait is one 2-minute cycle, and the timer is on screen 7 times a round regardless. The room calls that good enough, so no cloud player is needed here. If the round must show the timer within seconds of the first hand, this is the point where the answer flips to a cloud player.

Event 2, 9:40 pm: the game ends and the top earners list needs correcting before the 10:00 pm round, a 20-minute window. The manager edits the list and saves a new show. Pushed from the desk computer with the studio app, a 50 MB show crosses a 100 Mbit/s link in about 4 seconds (50 MB × 8 = 400 Mbit; 400 ÷ 100 = 4 s), so it lands well inside the window. Left to the 15-minute pull timer instead, the worst case is 15 minutes, and that still beats 10:00 pm. Swapping the card at the desk is the third route, and the show is designed to keep playing through the swap, because the internal copy carries it while the card is out.

The verdict: this room runs entirely offline and gives up nothing it actually asked for. The only thing it forgoes is a button that changes the screen in under 2 minutes, and nothing in the evening's schedule needs one.

The decision

Recommendation: run the loop on an offline card player when the screens play in a fixed order and a correction can wait out your pull timer or a walk to the screen. Choose a cloud player with a phone app only when someone must bring a specific screen up within seconds from the floor, and then give that screen a connection that holds through the session.

Two counts settle most rooms. Count the on-demand switches per session that someone actually makes: at zero or one, and with a loop cycle of a couple of minutes, the offline player wins, because the screen you want arrives on its next cycle anyway. Count the screens that need different content at the same moment: one offline player serves one screen, while one cloud account drives a whole room of them. When both counts come out small, the offline card player is the whole answer, with no subscription and nothing in the room to maintain.

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