Example embodiments relate to a display device having first and second substrates arranged opposite to each other, a semiconductor device on the first substrate, an organic light emitting element on the first substrate and an optical unit between the organic light emitting element and the second substrate. By reducing co-channel interference coming from different directions, spatial filtering with antenna arrays improves the call capacity of the system. The binary-encoded signaling message may include references to a saved state, or to a dictionary to enable compression of the message. The valve also includes a manual system that is decoupled from the automatic pressure reducing system for manually urging the sealing member toward the valve seat for closing the valve. The patient-specific examination parameters are electronically stored, and are electronically retrieved to implement a duplicate of the aforementioned procedure in an imaging modality-assisted follow-up examination.