Capacitive coupling-type transmitting and receiving circuits for information signal

A capacitive coupling-type transmitting and receiving circuit for information signal in which display data is transmitted via a non-contact transmission path comprising a display panel board having a display section, a transmitting board which supplies the display data to be displayed on the display section to the display panel board, and a capacitor which is formed between the transmitting board and the display panel board, wherein

• the transmitting board comprises an insulating board, a transmission signal processing circuit which is formed over the insulating board and which converts the display data from an external signal source into a voltage signal, and a transmitting capacitor electrode,
• the display panel board comprises an insulating board, a receiving capacitor electrode which is formed over the insulating board, an impedance converter circuit, and a reception signal processing circuit,
• a capacitive coupling electrode pair is formed by the transmitting capacitor electrode and the receiving capacitor electrode, and an insulating member is interposed between the transmitting capacitor electrode and the receiving capacitor electrode of the capacitive coupling electrode pair, to form the capacitor, and
• the voltage signal obtained at the receiving capacitor electrode is supplied via the impedance converter circuit to the reception signal processing circuit which converts the voltage signal to the display data to be displayed on the display section.