That is a failure that could potentially result in damage to the eye.
MEMS mirrors have built-in angle sensors, and when these report that there's irregular or no detected movement in one or both directions, the lasers are turned off.
The lasers in a MEMS mirror near-eye display operate in the microwatt range. Low power laser pointers operate in the milliwatt range, and the safety mechanism for those is that your eyelid is expected to shut to block off the laser in less than a second. Therefore, you have more time to shut your eyelids or remove your eye from the MEMS mirror display if there's a failure and the lasers fail to shut off.
MEMS mirrors have built-in angle sensors, and when these report that there's irregular or no detected movement in one or both directions, the lasers are turned off.
The lasers in a MEMS mirror near-eye display operate in the microwatt range. Low power laser pointers operate in the milliwatt range, and the safety mechanism for those is that your eyelid is expected to shut to block off the laser in less than a second. Therefore, you have more time to shut your eyelids or remove your eye from the MEMS mirror display if there's a failure and the lasers fail to shut off.