Tactus, a Ryoyo and Wistron-backed developer of on-demand tactile surfaces for electronic devices, has lifted its total funding to approximately $30m.

Tactus Technology, a US-based developer of tactile surface technology for electronic devices, has closed a series B round first supported by electronics supplier Ryoyo Electric Corporation in January 2014.

The round was expanded with an investment from venture capital firm IPV Capital, as well as further participation from existing investors.

Tactus raised $13.5m in the first tranche from investors including semiconductor producer Ryoyo, IT and communication technology company Wistron Corporation and VC firm Thomvest Ventures.

Although Tactus has not disclosed…