Read-and-write method of signals on the basis of electrically polarisable layers

Abstract

Abstract An electrically polarisable polymer layer which is provided with a system of electrodes is used as a data memory. The electric signals to be stored are recorded in the polymer layer by remanent polarisation of individual domains. The registered remanent polarisation is retained even after the signal field is switched off. The reading-out operation is based on a piezoelectric or pyroelectric activation of the polarised domains. Activation takes place by a multiplicity of the polarised domains simultaneously inducing electric signals in the system of electrodes, the signals then being assigned and scanned in parallel and/or by a multiplexing method. The registered remanent polarisation is normally screened by free charge carriers, so that there is no electric field on the outside. By activation, a disturbance of the system is then implemented by the screening effect of the compensation charges temporarily being lifted and a signal field thereby induced, which is used for reading out. In the case of a memory provided with a system of electrodes, the polarised domains of the polymer layer assigned to a single conductor track can be simultaneously activated pyroelectrically by a heating current pulse or piezoelectrically by compression or tension. In this way, the polarised domains assigned to the conductor track can be scanned simultaneously and then, by changing over to another conductor track, the corresponding other domains can be activated, so that altogether a selectively parallel read-out mode is made possible.

Inventors

• 👤 Aloys Dr. Eiling
• 👤 Richard Dr. Pott
• 👤 Günther Prof. Dr. Kämpf

Bibliographic Details