A slide deck that looks sharp in a darkened ballroom can be close to unreadable in a car park in the afternoon. Outdoor screen content design is the part of an outdoor build that rarely gets briefed, and it is the part you cannot fix once an audience is standing in front of the screen.
In short
- Daylight takes away contrast rather than brightness, so the dark parts of your content are what fail first.
- The light-text-on-dark-background convention that works in a dark room inverts outdoors. Dark text on a light field holds.
- Stroke weight and typeface matter more outdoors than type size does.
- Pale brand tints and subtle tonal separation disappear. Saturated colour and hard edges survive.
Outdoor screen content design starts with contrast
Brightness is the screen’s problem, and how the screen is pointed decides more of it than the panel specification does. We have written separately about what changes when a light-emitting diode (LED) screen goes outside, including the orientation question.
Ambient light lands on the face of the screen and reflects back off it, so the darkest thing the screen can show stops being dark. Researchers measuring what luminance people perceive as pure black on an electronic display found it depends almost entirely on how bright the surroundings are. Their study put the threshold as low as 0.0044 candelas per square metre against a surround of 0.1 candelas per square metre, rising to about 1 candela per square metre once the surround reached 900. A candela per square metre is the same unit a panel specification calls a nit.
That research is about electronic displays in general rather than event screens. Outdoors your black is a mid grey, and every design decision that depends on the difference between black and nearly black goes with it. Drop shadows stop separating anything. A dark grey panel placed behind white text does nothing at all.
The dark background that works indoors stops working outside
Conference decks are usually light text on a dark background, and indoors that is the right call. It sits well in a blacked-out room and it does not throw a wall of light back at the audience. Outdoors the convention inverts, because a dark background is the part of the picture ambient light ruins first. The screen cannot make that area any darker than the light falling on its face, so light type ends up floating on a washed grey field. It is usually invisible until the content is up.
Dark text on a light field keeps its contrast, because the light part of the image is the part the screen is genuinely good at. Turning a deck round is not a small edit, so it belongs in the brief rather than in the last hour of the get-in, the window when equipment is brought in and rigged.
United Kingdom guidance on producing clear print notes that reversed-out text, meaning white on black, is less sharp and more tiring to read for most people. Outdoors that penalty stacks on top of everything daylight is already doing.
Weight and typeface do more than size
How big type has to be is a viewing distance question, and we have covered it for content built for an indoor LED wall. Outdoors the thing that fails first is not size but weight. A light or hairline font puts a thin stroke on the screen, and a thin stroke has almost no area to hold against a lifted black level. The same word set in a medium or semibold weight, at exactly the same size, survives.
The Web Content Accessibility Guidelines set a minimum contrast ratio of 4.5 to 1 for normal text and 3 to 1 for large text, where large means at least 18 point, or 14 point bold. Those thresholds were written for web pages read on a device in a controlled room, so treat them as a floor rather than a target for a screen standing in a field.
The clear print guidance recommends sans serif faces such as Arial, a minimum of 12 point and ideally 14 point on paper, and keeping capitals, italics and bold to occasional use. Two of those carry straight across to a screen outdoors. A sans serif face with even strokes holds up, and a long run of capital letters throws away the word shapes people read by.
Pale brand colours are the first thing to go
Corporate palettes are full of tints, and tints are exactly what daylight flattens. A soft grey or a twenty per cent screen of the brand colour sits close enough to the raised black level to stop being distinguishable from it. Fully saturated colour holds, and so does a hard edge between two areas.
If your agenda slide separates four streams by colour alone, and two of those colours are tints of the same hue, the slide stops carrying information outdoors. Give each stream a label as well as a colour and it still reads.
Sponsor and partner artwork is the part you cannot redraw, and should not. What you can change is the field it sits on. Put it on white rather than on the event’s dark background, keep the clear space the brand guidelines ask for, and get the vector artwork rather than an image somebody pulled off a website, because a low resolution logo that passes indoors will show its edges on a large outdoor panel.
What to settle before the content is made
Specifying equipment before understanding what an event is for produces the wrong equipment. A screen specification that never asks what will be on the screen is half a specification. The questions worth settling early are mostly about people and files rather than panels.
- Who is building the content, and whether they know it is going outdoors.
- Whether the deck master is being rebuilt for a light background or reused as it is.
- Which font weights are available in the brand’s licensed font family.
- Where sponsor and partner artwork is coming from, and in what format.
- When one real slide goes up on the actual screen in daylight during the build.
A build is the one chance to see real content on the real screen with the sun in roughly the right place. Put a genuine slide up, walk to the back of where the audience will stand, and look at it.
Frequently asked questions
Can we use our indoor conference deck on an outdoor screen?
Usually not without changes. The layout and the grid can stay. What needs rebuilding is the master: a light background with dark text, a heavier weight for body copy, and any tint-on-tint colour pairing replaced. Plan that work into the content schedule early, because it is a rebuild of every slide rather than a change to a few of them.
Does a brighter screen fix unreadable content?
No, and it can make one problem worse. Raising the panel output lifts the whole picture, including the areas you wanted to read as dark, so a design built around dark backgrounds does not improve as the screen gets brighter. What helps is widening the difference between the lightest and darkest parts of the content itself. Brightness decides whether anyone can see the screen. Content decides whether they can read it.
Sources
- World Wide Web Consortium · Understanding Success Criterion 1.4.3, Contrast (Minimum)
- Sensory Trust · Guidance on producing clear print and large print documents
- Mantiuk, Daly and Kerofsky · The luminance of pure black: exploring the effect of surround in the context of electronic displays
If you have an outdoor screen in the diary and nobody has yet asked what is going on it, that is the conversation to have now rather than during the build. We supply LED video walls, projection, audio, lighting, rigging and staging, and we deliver nationwide from Manchester. Tell us what the screen is for and where it is standing, and we will tell you what the content needs to do. You can reach us through the contact page or by email at hire@eventproductiongroup.co.uk.
