TL;DR — the 7 principles in 30 seconds
(1) 3-5-7 rule: 3 seconds to capture, 5 elements max, 7 words in headline. (2) Strong contrast: 4.5:1 minimum ratio between text and background. (3) Visual hierarchy with one clearly dominant element. (4) Thick sans-serif typography (Inter Bold, Barlow Condensed), no thin serifs. (5) 3-colour palette with 60-30-10 rule. (6) Motion only to highlight 1 critical element, not everything. (7) Unambiguous CTA: one concrete action with imperative verb. If unsure, simplify more. The signage that sells is the one that doesn't look forced.
In this article
- Why most signage design fails
- 1. The 3-5-7 rule (the foundation)
- 2. Strong contrast (real readability)
- 3. Visual hierarchy (one element rules)
- 4. Display typography (no thin serifs)
- 5. 3-colour palette (60-30-10 rule)
- 6. Strategic motion (don't animate everything)
- 7. Unambiguous CTA (one verb)
- Font sizes by viewing distance
- Design tip per industry
- 5-minute audit of your screen
- Frequently asked questions
Why most digital signage design fails
The most common mistake isn't lack of design skill — it's treating the screen like an A4 print. A printed page is viewed up close and processed for minutes. A screen in a business is viewed in passing, for 3 to 10 seconds, from 1.5 to 5 metres away, with ambient light competing for attention. What works on paper doesn't work on screen, and vice versa.
The 7 principles below are adapted specifically to that context: quick, distant reading in competition with the environment. Apply them and your screen holds attention. Ignore them and your screen becomes wallpaper.
1. The 3-5-7 rule: the foundation
3 seconds · 5 elements · 7 words
The average passing viewer gives your screen 3 seconds before deciding to keep looking or not. In those 3 seconds they must catch the essence. If they need more time to understand, they leave.
Each piece can include up to 5 visual elements: headline, subhead, image, featured price or number, and CTA. A sixth element pushes one of those below the attention threshold. Look at your pieces — if you count more than 5 items, something must go.
The main headline must be 7 words maximum. Counterintuitive because we want to pack in information, but eye-tracking data on signage shows headlines over 7 words lose 60% of readers before the end.
2. Strong contrast: readable at 3 metres
Minimum 4.5:1 text-to-background ratio
Contrast is the luminance difference between text and background. WCAG (web accessibility standard) recommends 4.5:1 minimum for normal text, 3:1 for large text. For signage, where ambient light competes, push those numbers: 7:1 for normal text, 4.5:1 for large headlines.
Impossible combos still seen on real screens: white text on yellow background (~1.07:1 ratio, unreadable), light grey on medium grey (~2:1), orange on red (~1.5:1). They look fine on Canva with phone screen light, but disappear on a wall-mounted 3m-away screen.
Software-free quick test: print your piece in black and white. If the text is still legible without colour, contrast is fine. If in B&W the text blurs into the background, it won't read at distance in colour either.
3. Visual hierarchy: tell the eye where to go first
1 dominant · 1 secondary · 1 detail
When every element is the same size and weight, the eye doesn't know where to start. Visual hierarchy forces a path: dominant element (what the customer must see in 1 second), secondary element (context or price, 2nd second of attention), details (CTA, date, branding — only if the 3rd second lands).
Effortless hierarchy: the dominant 3-5× larger than secondary. Secondary 1.5-2× the detail. Smaller ratios don't read as hierarchy — everything feels "equally important."
Pro trick: squint at your piece. What stands out? That's the dominant. If multiple things stand out equally, there's no hierarchy. Reduce size/weight/contrast of secondary items until only one stands out under squint.
4. Display typography: thick sans-serif, not thin serifs
Clear edges + high weight + sans-serif
Screens render type with square pixels. Fonts with fine detail (serifs in stems, hairline strokes, italics) get lost or look ragged. Solid, thick fonts (bold sans-serif, condensed black, display) look defined even at 4-5 metres.
Works well: Inter Bold/Black, Barlow Condensed Black, Montserrat ExtraBold, Poppins Bold, Anton, Bebas Neue, Oswald Bold, Roboto Black, Source Sans Pro Black. All free on Google Fonts and available in Canva.
Avoid: Times New Roman (thin serif, unreadable >2m), Garamond (elegant serif but weak on screen), Courier (monospace hard to read), script/calligraphic fonts (Dancing Script, Pacifico — fine for logos, not for body), thin hairline weights (Roboto Thin, Helvetica Neue UltraLight — vanish in high ambient light).
Minimum legible sizes: see the font sizes by distance section below.
5. 3-colour palette: 60-30-10 rule
60% dominant + 30% secondary + 10% accent
A professional piece uses 3 colours maximum, distributed: 60% of the visual area is the dominant colour (typically the background or primary brand colour), 30% is the secondary (structure, headers, sections), 10% is the accent (CTA, featured price, urgency badge).
More than 3 colours creates visual noise and undermines authority. A piece with 6 different colours reads as amateur, even if each colour looks fine alone. The big brand designs (Apple, Stripe, Linear) use 2-3 colour palettes and nothing else.
Your 3 colours should come from your brand identity, not invented per piece. If your logo is red and white, your signage should be red + white + one accent (dark grey or a touch of yellow for prices). Different palettes per piece means no brand consistency and dilutes recognition.
For energetic accents (featured prices, "OFFER"), intense orange or red work over any palette. For premium or calmer accents, gold or dark green.
6. Strategic motion: animate the critical, not everything
1 highlight animation, not 5 simultaneous
Motion captures attention automatically — it's a biological change-detection reflex. That's why a blinking dot in an ad pulls your eye even when you try to ignore it. Used well it's gold; used badly it's poison.
Well used: one animation per piece, highlighting the critical element (price, CTA, "OFFER" badge). 2-3 passes max, then static so the eye can read. Smooth transitions between pieces (fade 0.5-1s) to avoid breaking attention.
Badly used: text appearing letter by letter while the customer tries to read (frustrating), elements continuously rotating (distracting), multiple simultaneous animations across elements (visual chaos), fast/aggressive animations that look like shopping mall ads (subtracts perceived quality).
Simple rule: squint at your screen. See "things moving everywhere"? Bad. See one specific movement highlighting one thing? Good.
7. Unambiguous CTA: one verb, one action
Imperative verb + concrete action
The CTA (Call To Action) tells the customer what to do after seeing your piece. Most screens either have no CTA or have weak CTAs ("more info", "contact us") that don't mobilise.
A strong CTA has 3 properties: (1) clear imperative verb ("Order now", "Book", "Ask at bar"); (2) concrete action possible in the moment ("Scan the QR", "Walk up to the counter", "Ask the waiter"); (3) visually highlighted with accent colour or contrasting background.
Weak CTAs: "Available now", "Ask us", "More info", "Come try". Vague, passive, don't say what to do.
Strong CTAs: "Order your burger today", "Book by scanning this QR", "Walk up and say 'TV offer'", "Call 020-...".
If your screen shows a promo but never says what to do with it, the customer processes it as ambient information without action. That's wasted attention.
Want to design your screen following these principles? Digisini includes templates with the 3-5-7 rule baked in.
Start freeFont sizes by viewing distance
This is the most-used guide by signage designers. Sizes in pixels for a Full HD screen (1920×1080). For larger or smaller screens, scale proportionally.
| Customer distance | Headline | Subhead | Body | Detail |
|---|---|---|---|---|
| 1-2 metres (counter) | 150-200 px | 80-100 px | 50-60 px | 30-40 px |
| 2-3 metres (waiting area) | 200-280 px | 110-140 px | 70-85 px | 45-55 px |
| 3-5 metres (corridor, queue) | 280-380 px | 150-190 px | 95-115 px | 60-75 px |
| 5-8 metres (street shopfront) | 400-550 px | 200-260 px | 130-160 px | 80-100 px |
| +8 metres (large shopfront) | 600+ px | 300+ px | 180+ px | 110+ px |
Design tip per industry
5-minute audit of your screen
If you already have an operational screen and suspect design issues, this is the quick audit. Do it with your team and fix what fails:
- 3-second test. Look at your screen for exactly 3 seconds. Did you catch the main message? If not, too much content or poor hierarchy. Trim until you can.
- B&W test. Take a screenshot, convert to black and white (any editor). Does text still read? If not, insufficient contrast.
- 5-element test. Count independent visual elements (headline, subhead, image, price, CTA, logo, badge...). If more than 5, cut the least critical.
- Distance test. Stand at the furthest point a customer would normally view from. Can you read the small text? If not, increase sizes.
- CTA test. What's the concrete action you're asking for? If the answer is vague ("for them to know the offer"), there's no CTA. Add imperative verb + action.
- Squint test. Squint at the screen. What stands out? That's dominant. If multiple things stand out equally, hierarchy is missing.
- Brand test. Cover your logo on the piece. Is it recognisable as your business from style alone? If not, palette and typography aren't consistent with your brand.
Most screens fail 3-4 of these on first audit. Not a sign of bad design — a sign you've been too close to your piece and lost perspective. After applying fixes, re-audit in 2 weeks.
When NOT to follow these principles strictly:
- Pure emotional branding — institutional videos or brand atmosphere can break the 3-5-7 rule because the goal isn't to inform but to create mood.
- Educational content in long waiting rooms — clinics with 20+ minute waits can show denser content because there's reading time.
- Rotating multi-language piece — changing language every 6-8s, the extended "loop" allows more content per language without saturating any single moment.
- Special events with creative concept — brand campaigns with specific art direction can deliberately break principles if the goal is notoriety/differentiation.
These cases are the exception, not the rule. For 95% of business signage pieces, the 7 principles apply always.
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