Transducer with piezoelectric, conductive and dielectric membrane

Patent metadata

Field	Value
Publication number	US-10735865-B2
Application number	US-201715404989-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Nov 29, 2011
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

This disclosure provides systems, methods and apparatus for microspeaker devices. In one aspect, a microspeaker element may include a deformable dielectric membrane that spans a speaker cavity. The deformable dielectric membrane can include a piezoactuator and a dielectric layer. Upon application of a driving signal to the piezoactuator, the dielectric layer can deflect, producing sound. In some implementations, an array of microspeaker elements can be encapsulated between a glass substrate and a cover glass. Sound generated by the microspeaker elements can be emitted through a speaker grill formed in the cover glass.

First claim

What is claimed is:

1. A display device comprising
an array of elements, each element including a cavity and a deformable membrane spanning the cavity, the deformable membrane including a first piezoelectric layer between first and second metal layers and including a dielectric layer, wherein the dielectric layer is capable of deforming on application of a drive voltage across the piezoelectric layer to generate an ultrasonic wave, wherein the elements in the array are encapsulated between a first substrate and a cover glass of the display.

2. The display device of claim 1 , wherein the first substrate is bonded to the cover glass with one of an adhesive, an epoxy, a glass frit, or a metal bond ring.

3. The display device of claim 1 , including one of a bi-stable display, an analog display, a flat-panel display, a plasma display, an electroluminescent display, an organic light-emitting diode (OLED) display, a liquid crystal (LCD) display, a non-flat-panel display, a reflective display, and an IMOD display.

4. The display device of claim 1 , wherein the cover glass of the display includes a plurality of acoustic ports extending through the cover glass to allow transmission of the ultrasonic wave.

5. The display device of claim 4 , wherein a diameter of the acoustic ports is between 10 microns and 500 microns.

6. The display device of claim 4 , wherein the acoustic ports are coated with a hydrophobic material.

7. The display device of claim 1 , wherein the cover glass has a thickness between 50 microns and 700 microns.

8. The display device of claim 1 , wherein the first substrate is a glass substrate.

Assignees

• Snaptrack Inc

Inventors

• Stephanou Philip Jason
• Burns David William
• Shenoy Ravindra V

Classifications

• H10N30/40

  with electrical input and electrical output, e.g. functioning as transformers · CPC title

• H10N30/07

  Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base · CPC title

• H04R17/00 Primary

  Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00}) · CPC title

• H04R2201/401

  2D or 3D arrays of transducers · CPC title

• G02B26/001

  based on interference in an adjustable optical cavity (interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26) · CPC title