Microsoft is working on its own Google Glass-esque smart wearable device, intended for use around live events such as sports.

According to its patent application (via Unwired View), Microsoft’s headmounted display unit will give the user “ supplemental information when viewing a live event”, such as a baseball game or live concert.

“A user wearing an at least partially see-through, head mounted display views the live event while simultaneously receiving information on objects, including people, within the user’s field of view, while wearing the head mounted display,” the application adds. Accompanying drawings show the device to look somewhat like a standard pair of sunglasses.

The patent application is from May 2011, which suggests that Microsoft is taking a rather more gradual approach to the device than Google, which has already unveiled working models of its Google Glass wearable device.