Insights, LED walls
Outdoor LED wall size and pixel pitch for events: a practical guide
How to choose an outdoor LED wall for an event: pixel pitch and viewing distance, screen size by crowd, daylight, weather, wind, power and cost.
An outdoor LED wall is the most visible thing on site and the easiest thing to get wrong. Too coarse a pixel pitch and the people at the front see dots. Too small a screen and the back of the crowd squints. Too big and the budget goes on square metres the content never uses. Pixel pitch, screen size and content resolution are the three numbers that matter, and outdoors the weather, the wind and the power supply matter just as much. This guide explains each, with worked examples for two typical outdoor events.
LED wall pixel pitch: what it is and how close people can stand
Pixel pitch is the distance between the centres of two LEDs, in millimetres. A 3.9 mm wall has pixels 3.9 mm apart; a finer wall packs them closer and costs more per square metre. Smaller pitch means a sharper image up close and a higher resolution for a given size.
The rule of thumb that works: the minimum comfortable viewing distance in metres is roughly the pixel pitch in millimetres. A 3.9 mm wall looks clean from about four metres; from eight to twelve metres it looks like a television. That suits most outdoor events, where a stage, a barrier or a row of tables keeps the audience a few metres back. Our outdoor panels are 3.9 mm. Coarser pitches, 4.8 mm and beyond, are for large fields where nobody is close to the screen.
LED screen viewing distance and size: work back from the farthest viewer
Size is decided by the back of the crowd, not the front. A useful rule for slides and anything with text: the screen height should be about one sixth to one eighth of the distance to the farthest viewer. Where the back of the crowd is 20 metres away, that means a screen roughly 2.5 to 3.3 metres tall. Sport and film are more forgiving than text. For 16:9 content, width is then about 1.8 times the height.
LED walls are built from tiles, typically 500 mm square, so real sizes come in half-metre steps. Two worked examples:
| Event | Farthest viewer | Wall | Tiles | Resolution at 3.9 mm |
|---|---|---|---|---|
| Beer garden or courtyard screening | About 20 m | 4.5 m × 2.5 m | 9 × 5 | About 1,150 × 640 pixels |
| Outdoor stage backdrop | About 25 m | 5 m × 3 m | 10 × 6 | About 1,280 × 770 pixels |
The screening wall is close to 16:9, so standard content fits without black bars. The stage wall is a little taller than 16:9, which suits a stage: a 16:9 picture sits across it with room above or below for a logo or the act's name. Both are below full HD, which is fine: content is scaled to fit and nobody in the crowd can see the difference at that distance. If the client is producing bespoke content, ask for it at the wall's native resolution.
For a stage backdrop the order is the same: choose the LED wall size for the back of the crowd first, then check it fits the stage width with room for the performers or presenters.
The screen does not have to be one rectangle. Two side screens flanking a stage, or a freestanding wall for an activation, are both common, and the same distance rules apply to each surface.
Content: resolution, text size and format
- Resolution. Full HD at 1920 × 1080 is the right starting point. For walls above full HD, ask for native resolution or 4K.
- Text size. A rough rule for readable text is about 25 mm of letter height for every 10 metres of viewing distance. On a 2.5-metre-tall wall with the back of the crowd at 20 metres, that means letters at least 50 mm tall on the wall, which is about a 30-pixel font on a full HD canvas. Bigger is safer. Slide templates and sponsor graphics rarely respect this; check them early.
- Contrast. Daylight flattens pale colours. Strong contrast and bold type read better in sun than fine detail.
- Format. Ask for 16:9, and send the client a template with the safe areas marked.
- Playback. A switcher drives the wall, with a backup source ready. Laptops connect through the switcher, never directly to the processor.
Brightness
Daylight is the reason outdoor walls exist. Outdoor panels run at several thousand nits so the picture holds up in full sun, where a projector shows nothing until dusk. The wall is turned down as the light goes, so it does not glare after dark. Where the site allows a choice, face the screen away from low sun.
Weather and wind
Outdoor panels are rated for rain. The processor, the switcher and the operator are not, so they go under cover, and the power connections are kept off the ground.
Wind is the real limit. A flat wall acts as a sail, so the frame behind it is ballasted for the size of the wall and how exposed the site is. Every build has a wind speed at which the wall comes down. Agree that figure, and who makes the call, before the day.
The build, weight and ground
Our walls are ground-supported on a frame, which needs level, firm ground and space behind for the frame and its ballast. Flying a wall from a stage roof is a rigging contractor's job. A 500 mm tile weighs in the region of seven to ten kilograms. A 4.5 m × 2.5 m wall is several hundred kilograms before ballast. A 5 m × 3 m wall is around half a tonne. Soft grass, slopes and the route the van has to take all decide where the wall can stand, which is one reason a site visit comes before the quote.
Power
Outdoor panels draw more than indoor ones because they run brighter. Plan on the order of 300 watts per square metre of wall as an average, with peaks two to three times that when the content is bright white in full sun. The 4.5 m × 2.5 m screening wall wants a dedicated supply of several kilowatts; the 5 m × 3 m stage wall wants a proper three-phase feed. Where there is no mains on site, that means a generator from a generator supplier, sized for the peak and not the average. We tell them what the wall needs. Processing and backup are on their own protected supply.
What drives the cost
- Area. Square metres of wall is the biggest number, which is why sizing from the back of the crowd rather than "as big as possible" matters.
- Build and de-rig time. A ground-supported wall builds in hours; the size and the ground decide the crew.
- Frame and ballast. An exposed site needs more of both than a sheltered courtyard.
- Processing. Processor, backup, switcher and the operator to run them.
- Days on site. Rehearsal days and multi-day events add crew time more than equipment time.
Common mistakes
- Sizing from the stage width rather than the back of the crowd, so half the audience cannot read the screen.
- A screen facing straight into the afternoon sun.
- Graphics with small, pale text that nobody checked at wall scale.
- No backup source, so one laptop crash stops the show.
- No agreed wind limit, so the decision is argued on the day.
- A wall specified before anyone walked the ground or checked the power.
How we do it. A site visit comes first. Then a size the back of the crowd can read, a frame and ballast for the site, and processing with a backup source. Our outdoor LED panels are in our own stock, prepared in our warehouse before they travel. See LED walls and screens for what we bring. If you are an agency briefing us on a client's behalf, the guide to white-label event production covers what to include and how the paperwork works.
Frequently asked questions
Is an LED wall better than projection outdoors?
In daylight, yes: projection only works once it is dark, and an LED wall is readable in full sun. Projection still makes sense for a film night that starts after dusk, or where budget is tight.
What pixel pitch do we need for an outdoor event?
For most outdoor events where the nearest viewers are four metres or more from the screen, 3.9 mm. Coarser pitches suit large fields where nobody is close.
Can an outdoor LED wall run in the rain?
Outdoor panels are rated for rain, and the processing and power go under cover. Wind is what stops a show, not rain.