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In 2026, AI digital signage is reshaping retail advertising by serving the right content to the right audience automatically — no manual scheduling required. This guide breaks down what AI actually does on a commercial display (audience detection, dayparting, gesture recognition), what hardware specs are needed to support it (camera module, 4GB–8GB RAM, stable connectivity, 4K resolution for AI-generated content), and which retail segments are moving fastest: QSR operators optimizing menu boards for throughput, fashion retailers matching content to shopper demographics, and grocery chains updating shelf pricing from a central POS. Real deployment data from McDonald's and Sephora shows measurable results — higher average check sizes and a 28% lift in dwell time respectively. The guide closes with a hardware buyer checklist and a breakdown of why sourcing directly from a digital signage manufacturer matters more for AI deployments than for standard display purchases: camera integration, RAM configuration, and software pre-loading all need to be handled at the factory level, not retrofitted after delivery.