US Patent 10509242 Micro-fastened, sealed light modulator

A switchable light modulator device comprises a fluid layer disposed between opposite spaced apart major surfaces of first and second substrates. Each of the substrates comprise first and second interoperable microstructures formed on the opposite major surfaces. The respective microstructures fit together to join the first and second substrates and to define wall portions for a plurality of cavities, the cavities sealing said fluid in discrete volumes.