The circuit comprises a synchronizing circuit (5) which tunes a security information or a living information demodulated in the RF receiving part (1); a static RAMs (6,7); a low decoder (8) which provides data to CPU (19) according to the input of key switching part (3); a display RAM (9) which stores the address and decoding data; an LCD controllers (13); and an LCD power supply (15) which provides V1-V5 power sources.
