The present invention provides a polymer-based piezoelectric composite material from which a piezoelectric film capable of outputting a higher sound pressure is obtained in a case of using a piezoelectric speaker, a piezoelectric film formed of the polymer-based piezoelectric composite material, and a piezoelectric speaker and a flexible display which are formed of the piezoelectric film. The polymer-based piezoelectric composite material of the present invention is a polymer-based piezoelectric composite material including a polymer matrix which contains a polymer having a unit represented by Formula (1), and at least one unit selected from the group consisting of, a unit represented by Formula (2-1), a unit represented by Formula (2-2), and a unit represented by Formula (2-3), and piezoelectric particles.

(MO.sub.x/2)  Formula (1)

(R.sup.1SiO.sub.3/2)  Formula (2-1)

(R.sup.2.sub.2SiO.sub.2/2)  Formula (2-2)

(R.sup.3.sub.3SiO.sub.1/2)  Formula (2-3)

The present invention provides a polymer-based piezoelectric composite material from which a piezoelectric film capable of outputting a higher sound pressure is obtained in a case of using a piezoelectric speaker, a piezoelectric film formed of the polymer-based piezoelectric composite material, and a piezoelectric speaker and a flexible display which are formed of the piezoelectric film. The polymer-based piezoelectric composite material of the present invention is a polymer-based piezoelectric composite material including a polymer matrix which contains a polymer containing a group represented by Formula (1), and piezoelectric particles.

*-L.sup.1-CR.sup.1R.sup.2—CN  Formula (1) In Formula (1), L.sup.1 represents a divalent linking group excluding a divalent aliphatic hydrocarbon group. R.sup.1 and R.sup.2 each independently represent a hydrogen atom, an alkyl group, or an aryl group.

Multicomponent fibers with a piezoelectric effect, including an electroactive fluoropolymer shell which adheres to a metal core. Also, a solvent-based fluoropolymer formulation which makes it possible to obtain optimum adhesion to a bare, electrically conductive metal filament. Also, a process for manufacturing these composite fibers, and also their uses in varied sectors of technical textiles, filtration and in electronics.

Piezoelectric composites are described. A piezoelectric composite can include a polymeric matrix, piezoelectric additive(s), and polyol. Methods of making and using the piezoelectric composite are also described.

An ultrasonic fingerprint recognition assembly is provided. The ultrasonic fingerprint recognition assembly includes a cover plate, a display panel, and an ultrasonic sensor disposed between the cover plate and the display panel. The ultrasonic sensor includes a thin film transistor (TFT) substrate which is close to the display panel, and a piezoelectric layer and a conductive layer which are disposed on the TFT substrate sequentially. The piezoelectric layer is obtained by mixing a piezoelectric material with an organic solvent, coating a mixture of the piezoelectric material and the organic solvent on a substrate, and conducting crystallization and polarization treatment. The organic solvent includes at least one of: butanone, propylene glycol monomethyl ether acetate, and dimethylacetamide.

The present invention relates to a method of preparing a shape-reconfigurable micropatterned polymer haptic material using an electric field technique, and more particularly, to a method of preparing a shape-reconfigurable micro-patterned polymer thin film and a haptic material by controlling the orientation of a liquid-crystalline organic polymer using an electric field control system and inducing the generation of defect structures having a regular microstructure array in a polymer film.

A piezoelectric polyvinylidene fluoride (PVDF) material, a method for manufacturing the same, and a fingerprint recognition module are provided. The polyvinylidene PVDF material includes PVDF, a first solvent, a second solvent, a fluorosurfactant, and an inducing material. Material of the inducing material is one of carbon nanotubes, carbon black, and gold nanorods. Because of the high anisotropy of the inducing material, molecular orientation of the PVDF material is induced, thereby improving piezoelectric performance of the piezoelectric PVDF material. Problems of conventional piezoelectric PVDF materials, which are used in ultrasonic fingerprint recognition modules, such as poor piezoelectric performance and high-energy loss are improved.

The semiconductor device includes a semiconductor element substrate having an insulation property, and a wire for positioning the semiconductor element with respect to the semiconductor element substrate. The semiconductor element substrate includes a disposition region for disposing the semiconductor element. The wire is provided at least at a part of the periphery of the disposition region.

The present invention pertains to a fluoropolymer composition comprising a copolymer of vinylidene fluoride (VDF) and trifluoroethylene (TrFE), to a process for the manufacture of said fluoropolymer composition and to uses of said fluoropolymer composition in various applications, in particular to uses of fluoropolymer films obtainable therefrom in electrical or electronic devices.

The present disclosure provides a composite electrode, an acoustic sensor using the composite electrode, and a manufacturing method of the composite electrode. The composite electrode includes a conductive layer, and a semiconductor high-molecular polymer layer formed on the conductive layer. The semiconductor high-molecular polymer layer has a three-dimensional mesh structure. The acoustic sensor includes a base; the above-mentioned composite electrode formed on the base; an organic layer formed on the composite electrode; and a top electrode formed on the organic layer.