How to prepare content for an LED screen: resolution, formats, timing and design rules

LED screen content is the part of a project the client sees every day and the part most often left to the last week. The cabinets are specified in millimetres and nits, the frame is engineered, the power is calculated, and then a 1080p file made for a laptop arrives for a 250 × 125 pixel shop window. It plays, but soft, cropped or with a grey band where black should be. This guide explains how content for LED displays is prepared: the pixel canvas, formats and frame rates, text size, motion and loop rules, and the content management system that keeps the screen current after opening day.

Start from the pixel canvas, not the physical size

A monitor has a fixed resolution and a designer never thinks about it. An LED wall has whatever resolution its size and pixel pitch produce, and that number is the first line of the brief. Divide the width and the height of the screen in millimetres by the pixel pitch. A 6 × 3 m wall at 3.9 mm is 6,000 ÷ 3.9 by 3,000 ÷ 3.9, about 1,538 × 769 pixels. That is not 1080p, not 4K and not exactly 16:9; it is its own canvas, and content is built at that size.

Worked examples: wall, film and poster

The same arithmetic covers every product. A 2 × 1 m Jellyfish LED Film at 8 mm gives 2,000 ÷ 8 by 1,000 ÷ 8, exactly 250 × 125 pixels. A 640 × 1,920 mm Poster LED Display at 2.5 mm gives 256 × 768, a portrait canvas of 1:3. A 4.8 × 2.7 m lobby wall in XR Fine at 1.25 mm is 3,840 × 2,160, native 4K. When the pitch does not divide evenly, use the cabinet's real pixel count: a 500 × 500 mm cabinet at 3.9 mm holds 128 × 128 pixels, so 12 × 6 cabinets make 1,536 × 768.

Why a 1080p file on a 250 × 125 canvas is wasted, and why upscaling looks soft

On the 250 × 125 film, a 1,920 × 1,080 file carries 66 times more pixels than the surface can show. The processor discards them, the headline that looked right on the monitor shrinks to a few pixels, and the file is five to ten times larger than it needs to be. The reverse is worse. A 640 × 360 clip stretched onto the 1,538 × 769 wall is enlarged 2.4 times: every edge is interpolated, letters bloom, and a fine-pitch wall looks coarse. Build at the native canvas, or at an exact multiple the processor scales down cleanly.

Aspect ratios that are not 16:9: ultra-wide, portrait and pillar canvases

Most LED walls are not 16:9. A reception wall of 12 × 2 m at 2.5 mm is 4,800 × 800 pixels, a 6:1 strip. A pillar wrap or a Poster LED Display is portrait. A stage set built with XR Event may be three separate panels on one canvas. The wrong answer is to letterbox a 16:9 video in the middle and leave black bars, which on an LED wall are dead area. The right answer is to set the composition to the exact canvas in the video editing software before the first layer is placed, and to keep that template.

Designing for ultra-wide canvases

On a 6:1 canvas one image cannot fill the width without extreme cropping, so ultra-wide content is designed as zones. A calm background runs across the whole strip, the message sits in the central third where people look first, and the outer thirds carry pattern, colour or a secondary line. Moves travel along the strip, not across it; a vertical move on a canvas 800 pixels tall is over in a moment. When the wall turns a corner, mark the corner column on the template and keep text away from it.

Designing for portrait and pillar canvases

Portrait canvases such as 256 × 768 read from top to bottom. Stack the message: brand or headline in the upper third, image in the middle, call to action at the bottom. Lines are short, so headlines are three or four words, never a sentence. A pillar wrapped in LED is seen from all sides and never as a whole, so the design should repeat or flow around it; a logo centred on one face is invisible from three of the four directions. Digital signage content design for these shapes starts with a walk around the object.

LED wall video format: codecs, bitrate, frame rate and colour

LED processors and media players are built around a short list of formats, and staying inside it avoids most playback faults. Video is delivered as MP4 with H.264 or H.265; stills as PNG for flat graphics and text, and high-quality JPG for photographs. Files with alpha channels, image sequences and project files belong in the edit suite, not on the player. Deliver one file per scene or per loop, named with canvas size, date and version, and keep the master project so that a change next month is a ten-minute job.

1. 01Container and codec: MP4; H.264 for compatibility, H.265 on large canvases where the player supports it.
2. 02Bitrate: about 8 to 12 Mbps for a 1080p-sized canvas, 25 to 40 Mbps for 4K, and 3 to 5 Mbps for a 250 × 125 film. Constant or high-quality variable bitrate, never a fast web preset.
3. 03Frame rate: 25, 30, 50 or 60 fps, progressive only, matched to the processor output, which is normally 50 or 60 Hz; 25 fps on a 60 Hz output judders slightly on pans.
4. 04Stills: PNG for text and graphics, JPG at quality 90 or above for photographs, exactly the canvas size, in sRGB.
5. 05No interlaced footage and no variable frame rate from phone recordings; convert both before delivery.

Colour space, levels and banding on dark gradients

Export in Rec.709 and check the levels. Video files normally carry limited range, black at 16 and white at 235, while graphics are full range, 0 to 255. If the player expects one and receives the other, blacks turn dark grey or shadows are crushed, and on an LED wall a grey black is the most visible fault. Agree the range with the integrator once and export every file the same way. Dark gradients are the second trap: a heavily compressed 8-bit file shows visible steps, or banding, across a night sky. Raise the bitrate, add a little fine grain, or render in 10-bit where the player accepts it.

Text rules for LED screen content

Text is where most LED screen content fails, because it is designed at arm's length and read at twenty metres. Two rules cover it. A headline should be at least a tenth of the screen height and secondary text no less than a twentieth; on a wall 769 pixels tall that is a headline of 75 pixels or more. And letters need about 1 cm of height for every metre of viewing distance: a screen read from 10 m needs letters of 10 cm, and a façade seen from 50 m needs half a metre, which on a 3.9 mm wall is 128 pixels.

Beyond size, keep contrast high and shapes simple. Light text on a dark background reads best on LED, because the lit pixels draw the letter rather than the space around it. Use a sans-serif with open counters in a medium or bold weight; thin strokes fall between pixels and flicker as text moves. Avoid tight tracking: at 3.9 mm a two-pixel gap between letters is 7.8 mm, which the eye closes at distance. One message per scene: a headline, at most one supporting line and a logo. If the sentence needs a second line, it needs a second scene.

Motion rules: slow, wide and camera-safe

LEDs are fast, but people are not. A pan or scroll that feels dynamic on a monitor is unreadable on a 6 m wall, because the viewer's eye has to travel the same distance in metres. Keep moves slow: a scrolling line should take at least eight to ten seconds to cross the screen, and a background move should be barely noticeable. Cuts and fades work; whip pans, spinning logos and fast zooms do not. Ease every move in and out, and let each text element stand still for at least three seconds before it leaves.

Two more rules come from the physical screen. Thin horizontal lines, one or two pixels high, interfere with the LED grid and with camera sensors and produce moiré, a shimmering pattern very visible in social media footage of the wall; keep lines at least three pixels thick and avoid fine stripes and small checks. And keep a safe margin: nothing important within five percent of the edges, because a cabinet border, a frame overlap or a slightly cropped mapping should never cut a letter in half.

Loop design: scenes, length, day-parting and power

A screen that people pass rather than sit in front of is watched a few seconds at a time, so the loop is built from short scenes. Six to ten seconds per scene is enough to read a headline and a line; a loop of 60 to 90 seconds holds eight to twelve scenes and repeats before anyone notices. Longer loops hide the third message from someone who sees the wall for twenty seconds; shorter loops become wallpaper. Order the scenes so that a brand scene, a product scene and a call to action appear within every 30 seconds.

Day-parting the playlist

The same loop is rarely right at 08:00 and at 20:00. A scheduler changes the playlist with the hour: breakfast in a café until 11:00, the lunch menu until 15:00, events in the evening; in a corporate lobby, a welcome for a visiting client at the hour of the meeting, then the standard loop. Weekday and weekend playlists, seasonal campaigns with start and end dates and a fallback loop for when nothing else is scheduled belong in the same plan, written down before the screen goes live.

Dark backgrounds draw less power and look richer

On an LED wall the content decides the power consumption, because every lit pixel draws current. A full white frame is the peak load; a typical mixed video averages 30 to 40 percent of it; a dark scene with bright elements runs below 20 percent. Designing on black cuts consumption and heat, and it looks better: LED black is the absence of light, so a dark background gives the deepest contrast any display can show. A wall of white slides draws the most power and looks the flattest, as our article on LED screen power consumption explains.

Content for transparent surfaces: LED film and mesh

Jellyfish LED Film on glass and mesh screens on façades follow one extra rule: black is transparent. Where the content is black no LED is lit, and the viewer sees through to the shop or the building. Content is therefore designed as bright elements on a black background, never as a filled frame. A white background turns the window into a solid wall, defeats the reason the film was chosen and doubles the power draw. Thin logos, floating product shots, moving type and light effects work; full-frame video and busy photographs do not, as our shop and window LED screens article shows.

Brightness and colour: the LED wall is not your monitor

A design monitor shows about 250 to 300 nits in a dim room; an indoor LED wall runs at 600 to 1,000 nits and an outdoor screen at 5,000 or more, against daylight. Saturated reds and greens look far stronger on LED than in the edit, pastel colours wash out, and a subtle gradient that read on the monitor may vanish. Design on a calibrated monitor at 6,500 K and gamma 2.2, the same white point and curve the wall is calibrated to, and treat the on-screen preview as a sketch.

Then preview on the wall. Xeron previews every new loop on the installed screen or on a sample cabinet of the same product, at the intended brightness, from the real viewing distance and in the real ambient light. Ten minutes of standing where the customer stands settles most colour and size arguments faster than any test chart: text that is too small, a red that clips, a grey that is really dark green. A phone photograph from that spot goes back to the designer with the notes.

Design for the pixels the wall actually has and the light it actually makes. Everything else in LED content follows from those two numbers.

LED screen content management: scheduler, playlists and ownership

A screen with no content plan shows the opening-day loop for a year. A content management system, whether a cloud scheduler or a local player with remote access, keeps the wall current. It holds the playlists, applies the day-parting schedule, receives new files over the network without a technician on a ladder with a USB stick, and reports whether the player is online and what it is showing. For a retailer with many branches, one CMS drives every screen from one desk and puts the same campaign live in every shop at 09:00.

Emergency messaging and the fallback loop

The CMS should be able to interrupt everything. An emergency message, an evacuation notice in a stadium, a delay at an airport, a closure at reception, overrides the playlist with one action and returns to it when cleared. Set this up and test it before opening, and decide who may trigger it. Equally, define what plays when the network drops or a file fails: a stored fallback loop, never a black wall or a desktop with error dialogs. XR Arena and XR Event installations rehearse both cases before the first event.

Who owns the content calendar

Screens go stale for one reason: it is nobody's job. Name one owner of the content calendar, usually marketing, with a deputy, and give them the rules for the wall: how many scenes, how long, what must be there, what may never be. Agree a rhythm, monthly at least and weekly in retail, and a simple approval path so that a scene is checked on the wall before it enters the loop. Keep an archive with dates and versions; last spring's loop is the fastest starting point for this one.

Accessibility and legal basics

Readable content is accessible content: size, contrast and dwell time as described above cover most of it, and a scene that holds still for five seconds can be read by someone who reads slowly. Flashing is the hard limit. Content should never flash more than three times per second, and large areas switching between very bright and very dark at that rate are the specific pattern that can trigger photosensitive seizures; strobing transitions and blinking text are left out of the brief. On a 5,000 nit outdoor screen the same rule protects drivers.

Outdoor screens fall under municipal and highway rules that differ by district, and the content plan must respect them in general terms: many authorities restrict full-motion video or fast animation on screens visible from a road, require dimming after dark and forbid content that resembles a traffic sign. Our outdoor LED buying checklist covers the permit; the content team needs to know which class the screen was permitted in before designing for it, because a static-image permit does not become a video permit by loading a video.

Pre-flight checklist before sending files

1. 01Canvas: the file equals the pixel canvas or a clean multiple of it; same aspect ratio, no letterbox bars.
2. 02Format: MP4 H.264 or H.265, progressive, constant frame rate matching the processor output, bitrate as agreed.
3. 03Colour: Rec.709, levels agreed as full or limited, 6,500 K white point checked on a calibrated monitor.
4. 04Text: headline at least a tenth of the screen height, about 1 cm of letter per metre of viewing distance, sans-serif, high contrast, one message per scene.
5. 05Motion: slow moves, no fast pans, lines at least three pixels thick, nothing important within five percent of the edges.
6. 06Loop: six to ten seconds per scene, 60 to 90 seconds in total, dark backgrounds, no flashing above three per second.
7. 07Transparent surfaces: black background, bright elements only.
8. 08Handover: canvas size, date and version in the file name; master project archived; playlist and schedule written down.
9. 09Preview: watched on the wall or a sample cabinet from the real viewing distance and approved by the content owner.

Common mistakes in LED screen content

1. 01Designing at 1,920 × 1,080 for a canvas that is nothing like it, and letting the player crop or stretch.
2. 02Using stock templates built for social media, with text sized for a phone.
3. 03White or pale backgrounds on a wall running at 1,000 nits, which glare, draw peak power and flatten the image.
4. 04Fast scrolling tickers and spinning logos that nobody can read.
5. 05A black background on an opaque wall mistaken for a transparent effect, or a white background on a transparent film.
6. 06Exporting with a web or messaging preset, which produces banding on gradients and a soft image.
7. 07Leaving the opening-day loop running for a year because nobody owns the calendar.

If you are planning a screen and want the content brief, the canvas sheet and the loop template prepared together with the hardware, tell us about the project on the Start a Project page. Xeron prepares the pixel canvas, the format sheet and the preview session for every installation, from a single Poster LED Display to an XR Arena perimeter.