Two things mentioned by others:
- The device is NOT projecting a virtual keyboard with a laser that you can tap with your fingers.
Instead, it lets you use *YOUR* finger as a keyboard and you tap them with your thumbs.
- "Projection" is a poor choice of a word. What the device do, is that it superposes a visual aid on the glasses' HUD to help with the tapping. But you're basically tapping your thumb against your fingers (the glass just puts some labels as augmented reality to help you).
So you see that this patent has absolutely nothing to do with virtual keyboard.
Instead, it's got a much more older prior art:
This way of data input is *VERY* closely related to ancient for of finger-counting in base 12 (probably has been used historically in most culture which count in "dozens") where you count phallanges with your thumb.
According to Wikipedia: apperently this method is still used around in Asia, so no surprise that a korean company is trying to turn it into a data input method.