DOOH Advertising: Formats, Buying, and Measurement
Digital out-of-home (DOOH) is advertising on digital screens in public and commercial spaces. Programmatic buying is optional. Person-level attribution is not a promise the format can usually keep.
Digital out-of-home (DOOH) is advertising on digital screens placed in public and commercial spaces. IAB’s December 2024 DOOH definition describes those screens as delivering dynamic broadcast or interactive visual content. The screens may face one person or many. Programmatic buying can be used. It is not what makes the format DOOH.
Plan DOOH with the rest of the outdoor and out-of-home mix, not as a desktop display tactic moved outdoors. Venue context is the product. Connected TV and mobile can complement a board. They are not the same inventory.
What DOOH is not
IAB is also explicit about the boundary:
- Ads on personal phones, laptops, or watches, even when the person is outside, are not DOOH.
- Static billboards and static signs with QR codes are traditional OOH, not DOOH.
- In-app ads are mobile advertising.
- In-store audio is not DOOH.
- Broadcast or cable TV watched away from home is not DOOH, even when Nielsen reports out-of-home TV.
A retail screen can be bought as DOOH or as retail media depending on whether retailer first-party data and store measurement sit at the center of the buy. The screen alone does not settle that label.
OOH versus DOOH
| Topic | Traditional OOH | DOOH |
|---|---|---|
| Physical unit | Print, vinyl, poster, static board | Digital screen |
| Creative change | Manual replacement | Remote schedule, daypart, or dynamic rules |
| Buying | Usually a negotiated direct contract | Direct, programmatic guaranteed, or RTB where offered |
| Proof | Posting, photos, operations logs | Proof of play or stronger display telemetry |
| Strength | Fixed presence in a place | Time, weather, or offer changes in the same place |
Traditional OOH still has a job when the message should stay up, the dwell time is long, or the network is not digital. DOOH earns its cost when the message should change by daypart, weather, inventory, or nearby event, and when the creative can be read at the actual viewing distance and speed.
Direct buying versus programmatic buying
OAAA’s DOOH buying and selling guidance describes two common paths:
- Direct. A negotiated relationship between a network and an advertiser. Agencies and rep firms may sit in the middle. Price, dates, share of voice, and locations are contracted.
- Programmatic. Software and data automate discovery, bidding or guaranteed booking, trafficking, and reporting. That can be open auction, private marketplace, or programmatic guaranteed.
IAB Tech Lab’s OpenDirect 2.1 work with OAAA covers guaranteed trading for classic and digital OOH, including inventory search, price and availability, targeting and frequency constraints, creative rules, booking, and proof of posting or play. OpenRTB added a DOOH object so real-time bids can describe screens. Availability still depends on the network, DSP, and market. Do not assume every board is in an exchange.
Venue and context
Buy the place and moment, not a generic impression. OpenOOH-style venue groups IAB lists include transit, retail, outdoor boards and street furniture, health, point of care, education, offices, leisure, government, financial, and residential buildings. Dwell time, viewing angle, lighting, crowd speed, and nearby intent all change what copy can do.
A coffee offer on a hot afternoon next to a store can be useful. The same 15-word paragraph on a highway board at 65 miles per hour is unreadable. Match message density to dwell time before you pick a vendor.
Creative and trafficking
- Confirm aspect ratio, resolution, file type, duration, audio rules, and loop length with the network.
- Design for the farthest likely viewer, not the pitch-deck screenshot.
- Keep one offer, one brand cue, and one next step.
- If creative changes by weather, score, or daypart, document the rules and the fallback.
- Traffic the approved file to the booked screens and dayparts. A winning bid that never plays is not delivery.
Proof of play, reach, and measurement limits
OAAA’s measurement guidance separates proof of play from proof of display. Play logs from a scheduler show that an ad was queued. They do not prove the screen was on, connected, and visible if the panel overheated, lost power, or failed. Stronger proof uses hardware telemetry, third-party audits, or cameras. Ask which of those the network actually provides.
Reach for OOH is an audience estimate for a location and time, not a login. Opportunity to see is not the same as a person-level view. Mobile location matches, panel studies, and sales uplift tests can be useful when the design is honest about sample, window, and controls. They do not restore cookie-style user paths for every passerby. Do not promise precise person-level attribution.
OAAA and The Harris Poll surveyed 1,023 U.S. adults ages 18 to 64 from April 2 to 9, 2024. Among recent DOOH viewers, 76% said they had taken an action after seeing an ad. That is self-reported survey response from a sponsored industry study, not causal proof for a specific campaign. Source: OAAA DOOH study, 2024.
Network examples, not a complete market list
These companies appear often in DOOH planning. Confirm current products and markets before a buy. The list is not an endorsement.
- Broadsign publishes programmatic and digital signage tools for DOOH networks.
- Vistar Media connects advertisers to DOOH inventory for programmatic buying.
- Outfront Media sells digital billboard and transit inventory in the markets it operates.
Frequently Asked Questions
What is digital out-of-home (DOOH) advertising?
IAB defines DOOH as digital media used for marketing outside the home: screens in public and commercial spaces that deliver dynamic or interactive visual ads. Personal devices, static posters, in-app ads, in-store audio, and broadcast TV viewed away from home are not DOOH.
How is DOOH different from traditional OOH?
Traditional OOH includes static posters, vinyl billboards, and other print outdoor units that are replaced manually. DOOH uses digital screens that can change creative remotely. Both can be bought direct. Only DOOH can also be traded programmatically when the network supports it.
Is programmatic required for DOOH?
No. IAB lists programmatic buying as optional, not a core requirement. Many campaigns are still a negotiated direct deal between a network and an advertiser or agency.
Can DOOH prove which person saw an ad and later bought?
Not with certainty. Proof of play confirms scheduled playback. Reach is usually an audience estimate for a venue and time. Mobile or sales matches are modeled or panel-based. Treat them as directional, not person-level proof.
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