The future of text input may not include the presence of a keyboard. The latest patent “Holographic keyboard display†that Microsoft obtained this week describes the future of text input. The AR/VR system can sense user input through a virtual keyboard plane and read user gestures to simulate text typing. Such a holographic keyboard will operate like a normal keyboard. 
The mention of games in patent documents is the first application, but Microsoft's inherent interest in corporate IT has made the workplace another potential application for holographic keyboards. Combined with the latest AR/VR head-display technology, future knowledge workers may no longer need a desk or even go to a centralized workplace. Instead, smartphones can virtualize desktop PCs, allowing employees to use gestures for text entry anytime, anywhere.
The Microsoft patent describes an "HMD (Head Mounted Display) device" that helps track down the system, and the file claims that virtual keyboards can support virtual reality and mixed reality applications. 
Take a look at the picture in the text. Here's a look at Microsoft's vision of an AR/VR environment that includes a Kinect sensor (XBox's existing motion tracking product), a TV set, a virtual keyboard, and an augmented reality guide floating in the air. The holographic hand represents the user's real hands resting on the virtual keyboard, so the user can perform text input from various locations.
As for the underlying technology, Microsoft's system will fix the holographic keyboard in space by reading the head direction. Patent documents show that regardless of the head orientation, the AR/VR keyboard interface will remain in the field of view.
Microsoft mentioned that "a user is playing an interactive game that includes a holographic guide," so we can see that the patent appears to be clearly targeting game applications. But the virtual keyboard may also eventually replace the traditional workplace settings. For this area, Microsoft has gained a considerable presence through the Office suite. The tech giant has expressed interest in expanding AR use cases, and they have applied for a smart glasses patent that can track when you dine and food content.
Now Microsoft has entered the AR field through HoloLens technology (some of which came from the authorization of smart glasses manufacturer ODG, which completed a round of US$58 million round A financing at the end of 2016). It's not hard to imagine that the future Hololens will carry an AR-enabled word processor just like Word on PCs.
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