Google Display Network: when display campaigns make sense

The Google Display Network (GDN) is one of the most powerful, and most misunderstood, advertising platforms available to marketers in 2026. Many advertisers launch display campaigns as an afterthought alongside their Search campaigns, without a clear objective or targeting strategy. The result is low CTR, wasted budget, and the conclusion that "Display doesn't work." But that conclusion is wrong. Display works exceptionally well, provided you use it for what it was designed to do. This article explains exactly what the Google Display Network is, when it makes sense to use it, how to set up targeting that delivers results, and how AdBrains AI automatically optimises this campaign type for consistently better performance.

What is the Google Display Network?

The Google Display Network is a vast collection of more than 35 million websites, apps, and YouTube channels where Google can place advertisements. Think news sites, blogs, online magazines, mobile apps and even Gmail. Unlike Search campaigns, where your ad appears when someone actively types a search query, Display ads appear while the user is doing something else: reading an article, using an app, or checking their inbox.

Display ads are visual by nature. They consist of images, animated banners, or Responsive Display Ads (RDAs), where Google automatically assembles the best combination of images, logos, headlines and descriptions. The network reaches more than 90% of all internet users worldwide, making it uniquely suited for reach and brand awareness goals.

Because Display works so differently from Search, it requires a different mindset. You are not casting a wide net and hoping someone happens to buy. You are using the network strategically to reach the right people at the right moment, even when they are not yet ready to convert.

Search vs. Display: the fundamental choice

Before deciding whether to run Display campaigns, it is essential to understand how they differ from Search. With Search, you are targeting intent: someone types a query and your ad appears as a direct answer to a concrete need. The probability of an immediate conversion is relatively high. With Display, there is no active intent. The user is not looking for your product, but you reach them anyway, based on who they are, what they did previously, or what content they are currently consuming.

This makes Display less suitable as the sole channel for direct conversion goals, but extremely powerful as part of a broader funnel strategy. Research shows that advertisers who combine Search and Display achieve on average 28% higher brand recall than those who rely on Search alone. The table below summarises the most relevant differences:

Think of Search and Display not as competing options, but as complementary instruments. Search captures the bottom of the funnel, Display works the top and middle.

When do Display campaigns make sense?

This is the core question of this article. Display is not always the right choice, but in the following situations it consistently delivers value:

• Remarketing to previous visitors: This is by far the most powerful application of Display. Someone visited your website but did not purchase. With remarketing, you reach that person again while they browse other sites, with a relevant banner reminding them of your brand or product. Warm audiences convert significantly better than cold ones.
• Building brand awareness in a new market: If you are launching a new product or entering a new market segment, Display helps you rapidly create name recognition among large groups of potential customers.
• Guiding long purchase decisions: For products or services with a longer consideration period, such as electric bikes or heat pump installations, Display is ideal for staying visible throughout the entire decision-making process.
• Amplifying seasonal campaigns: In the run-up to peak periods, you build brand awareness and top-of-mind share via Display, so that Search campaigns perform better during the actual peak.
• Cross-sell and upsell to existing customers: Customers who have already purchased respond well to Display ads featuring relevant follow-up products or accessories related to their previous order.
• Reaching competitor audiences: With the right targeting, your banner can appear on websites that attract your competitors' visitors, or to people actively researching comparable products.

A practical example: E-4motion.com, the webshop for new electric folding bikes, uses Display remarketing to re-engage visitors who viewed a product page but did not make a purchase or submit a test-ride request. By reaching them afterwards with a visual banner featuring the exact model they viewed, the return visit rate increases substantially. The low CPC of Display makes this cost-efficient, even for relatively small audiences.

The Display remarketing funnel

The remarketing funnel clearly illustrates why Display is such a valuable reactivation channel. Of all website visitors who enter a remarketing audience, a well-configured Display campaign reaches an average of 72% again via banner ads. Of those, approximately 18% click through to the website, and of those returning visitors, an average of 6% converts. That may sound modest, but consider: these are visitors who would otherwise have been completely lost. The CPA of Display remarketing is in most sectors substantially lower than the cost of acquiring entirely new visitors via Search.

For ToetsJeKennis.nl, the online learning platform offering exams and courses, Display remarketing is a structural part of the campaign strategy. Students who viewed a course page but did not check out are reached again via Display precisely when they are consuming other content. This increases the number of returning purchases without requiring additional Search budget.

How AdBrains AI automatically optimises Display campaigns

Managing Display campaigns manually is time-consuming and error-prone. Placements must be monitored and excluded, audiences must be updated, ad creatives must be rotated based on performance, and bidding strategies must be adjusted as audiences grow or shrink. At AdBrains, we automate this entire process through our own proprietary AI technology, specifically developed for Google Ads management.

Our audience management automation system automatically creates and maintains all required remarketing audiences every week: PROD audiences for active campaigns, Incubator audiences for testing new segments, and RLSA audiences for Search ads. Every audience is correctly segmented based on behaviour, such as product page views, cart abandonment, or previous purchases, so that the right message reaches the right person at the right time.

Our multi-agent verification system reviews every optimisation decision before it is executed. Four independent AI agents verify whether a placement exclusion, bid adjustment, or audience segmentation change will genuinely improve performance before it goes live. This prevents the classic pitfall where automation introduces errors rather than solving them.

On the creative side, our RSA improvement system continuously analyses the Ad Strength scores of all Responsive Display Ads. When a combination of headline, description, or image underperforms, the AI automatically generates improvement recommendations or rewrites ad copy that has received a POOR status. This keeps the quality of Display ads consistently high without any manual intervention.

For bidding strategy, our automatic tCPA and tROAS optimisation system adjusts Smart Bidding settings daily based on current conversion volume and margin targets. For Display remarketing, objectives are split by audience segment: a warm cart abandoner justifies a higher tCPA than a cold in-market audience. The AI adjusts this automatically, without requiring a daily intervention from an account manager.

Finally, our server-side signal enrichment infrastructure ensures that view-through conversions and indirect contributions from Display campaigns are correctly tracked and fed back to Google's Smart Bidding algorithm. Via our own server-side Google Tag Manager setup, first-party conversion signals are enriched, giving the algorithm a more complete picture of the true value of each Display impression. This leads to structurally better bidding decisions and higher overall campaign performance.

Targeting options within the Google Display Network

The power of Display lies in its targeting capabilities. Google offers a wide range of options that can be combined intelligently for maximum relevance:

• Remarketing lists (audiences): Segments of previous website visitors, cart abandoners, existing customers, and more.
• In-market audiences: Google identifies users who are actively researching a specific product category, such as electric bikes or air conditioning installation.
• Affinity audiences: Broad audiences based on long-term interests and lifestyle patterns.
• Custom audiences: Build your own audience based on specific search terms, visited URLs, or app usage.
• Demographic targeting: Age, gender, income level, parental status.
• Contextual targeting: Your ad appears on pages covering specific topics or on specifically selected websites.
• Customer Match: Upload your own customer list to reach existing customers or find similar new prospects.

For Clima-Active.nl, the air conditioning and heat pump installation company, a smart combination of remarketing and in-market audiences consistently drives more quote requests. Visitors who viewed the quote request page but did not complete it are retargeted with a Display banner featuring a time-sensitive offer, bringing a meaningful group back into the conversion funnel.

Frequently asked questions about the Google Display Network

What is the difference between Google Display Network and Google Search?

Google Search shows text ads to users who are actively searching for a specific keyword. Google Display places visual banners on websites, apps and in Gmail, to users who are not actively searching. Search targets direct intent and immediate conversion, while Display focuses on reach, brand awareness and remarketing. The two campaign types are complementary and work best in combination with each other.

What is a realistic CTR for Display campaigns?

The average CTR for Display campaigns is significantly lower than for Search, typically between 0.1% and 0.5%. This is normal and reflects the passive nature of Display: users are not actively looking for something to buy. Remarketing campaigns generally perform better than cold display targeting because the audience is already familiar with the brand. Part of Display's value is also in view-through impact, which represents brand recall among users who saw the ad but did not click.

How do I prevent wasted budget in Display campaigns?

Wasted budget in Display typically results from overly broad targeting, poor placement control, and missing exclusions. The most important measures are: always use specific audience segments rather than broad demographic targeting alone, exclude irrelevant placements and app categories, review placement reports weekly, and ensure correct conversion tracking so you can measure true value. AdBrains automates this monitoring process through AI-driven placement analysis.

Should I always run Display and Search together?

This is strongly recommended, but not always mandatory. If you do not yet have a Search foundation and your budget is limited, first build a solid Search campaign with correct conversion tracking in place. Once you have active website traffic and an existing customer base, Display is a logical addition for remarketing and funnel expansion. The combination of Search and Display delivers on average 28% higher brand recall than Search alone.