Investors from Shanghai have joined a completed $5.5 million Series A1 round for AI business Cambridge Touch Technologies which aims to build on hard-won attraction in Asia. CTT is developing AI-driven, 3D multi-touch sensing technologies for smart devices. Existing investors - Parkwalk Advisors, Cambridge Enterprise and Amadeus Capital Partners - participated in the round and were joined by new investors China Materialia of Shanghai and Downing Ventures of London. Ascendant Corporate Finance provided advice to CTT on the fund raising. The Cambridge UK company's technology uses what is regarded as the world's simplest architecture to deliver an all-screen, multi-finger 3D touch solution that can scale to all device sizes at a fraction of the cost of existing approaches.