Flexural deformation sensing device and a user interface using the same

A computer program product, comprising a computer readable storage medium storing program codes thereon for use by an electronic device, said program codes comprise:

• instructions for measuring a first electrical signal and a second electrical signal, and
• instructions for calculating a flexural deformation as a result of an external stress,
• wherein said stress is applied on a apparatus to cause said flexural deformation of said apparatus, said apparatus comprises at least one cell, said cell comprises:
• a first electrode,
• a central electrode,
• a second electrode,
• a first sensing layer placed between the first electrode and the central electrode,
• a second sensing layer placed between the central electrode and the second electrode,
• a circuit connected to the first, second and the central electrodes, said circuit being configured to measure the first electrical signal between the first electrode and the central electrode, and the second electrical signal between the second electrode and the central electrode,
• and wherein at least one of the first electrical signal and the second electrical signal is generated in response to the external stress, wherein the first sensing layer comprises piezoelectric crystallites aligned substantially in a first direction parallel to the first sensing layer, the second sensing layer comprises piezoelectric crystallites aligned substantially in a second direction parallel to the second sensing layer, wherein the first direction and the second direction are not parallel to each other, wherein said apparatus is part of a user interface configured to accept a user input and to convert said user input into at least one of the first electrical signal and the second electrical signal, wherein said apparatus is a flexible sensor module fitted to a part of a human body, and wherein a movement of the part of the human body produces the external stress for controlling the electronic device.