AKP tick tock, page-18

Well if i understand correctly, you would simply allocate a portion of mems chips to a particular viewer in a particular direction.

The US army use directional sound technology as a way of targeting someone and sending extremely high pitched and uncomfortable sounds in that specific direction. People operating and near the device cannot hear anything unless they move in the line of 'fire' of the long range acoustic device. I think the mems chips would employ a similar principle and focus sound in particular directions.

- Example of a long range sound device.