Sony has unveiled a headset display that snaps on to a pair of glasses a la Google Glass. The entertainment giant said its Single-Lens Display Module projects images and information into the wearer’s vision on one side of the specs. The hardware will sport a 640 x 400-pixel color display with a 10,000:1 contrast ratio, and will be powered by an ARM Cortex-A7 processor core and a 400mAh battery. It will pair with other mobile devices, including cameras and handset, via Bluetooth. It also does Wi-Fi and has an electronic compass, accelerometer and touch sensor – all inside a 40g widget.