Fingerprint readers and facial recognition techniques are good for adding a base level of security to your phone without sacrificing convenience. However, they have their limits. It can be hard to switch between methods on a whim, and dedicated intruders can get through if they either make you unlock your phone or develop convincing fakes. Synaptics thinks it has a solution: It's unveiling a "biometric fusion engine" that can combine results from face and fingerprint detection before letting you into a mobile device or PC. Ideally, this makes it easier to sign in even as it adds an extra layer of security.