PRESSURE DETECTION AND DISPLAY APPARATUS AND ELECTRONIC DEVICE

• US 20160132151A1
• Filed: 05/21/2014
• Published: 05/12/2016
• Est. Priority Date: 06/04/2013
• Status: Active Grant

• Current Assignee: Nissha Co., Ltd.
• Original Assignee: Nissha Printing Company Limited (Nissha Co., Ltd.)
• Inventors: WATAZU, Yuji
• Granted Patent: US 9,836,171 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01L 1/16 using properties of piezoelectric devices
• CPC Class Codes: G01L 9/08 by making use of piezoelectric devices , i.e. electric circuits therefor
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133394 Piezoelectric elements associated with the cells
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display

Abstract

A pressure detection and display apparatus can provide good visibility even if a person wears polarized sunglasses. The pressure detection and display apparatus includes a piezoelectric sensor having upper electrode, lower electrode, and a piezoelectric layer interposed between the upper electrode and the lower electrode a polarization plate disposed under the lower electrode, and a display member disposed under the polarization plate. The piezoelectric layer is made of a retardation plate. The piezoelectric sensor and the polarization plate are arranged such that the absorption axis of the piezoelectric layer defines an angle of 20 degrees to 70 degrees relative to the slow phase axis of the polarization plate.

Claims

1. A pressure detection and display apparatus comprising:

a piezoelectric sensor having an upper electrode, a lower electrode, and a piezoelectric layer interposed between the upper electrode and the lower electrode; and

a display device including a polarization plate located closer to the lower electrode of the piezoelectric sensor and a display member located below the polarization plate;

the piezoelectric layer being made of a retardation plate; and

the piezoelectric sensor and the polarization plate are arranged such that a slow phase axis of the piezoelectric layer defines an angle of 20 degrees to 70 degrees relative to an absorption axis of the polarization plate.

2. The pressure detection and display apparatus according to claim 1, wherein retardation value of the piezoelectric layer is a quarter of visible light wavelength.

3. The pressure detection and display apparatus according to claim 1, wherein retardation value of the piezoelectric layer is 800 nm to 30000 nm.

4. The pressure detection and display apparatus according to claim 1, wherein the upper electrode includes indium tin oxide or “

poly(3,4-ethylenedioxythiophene)”

.

5. The pressure detection and display apparatus according to claim 1, wherein the lower electrode includes indium tin oxide or “

poly(3,4-ethylenedioxythiophene)”

.

6. The pressure detection and display apparatus according to claim 1, wherein the piezoelectric layer is made of organic piezoelectric material.

7. The pressure detection and display apparatus according to claim 6, wherein the organic piezoelectric material includes polyvinylidene fluoride or polylactic acid.

8. An electronic device comprising:

a pressure detection and display apparatus according to claim 1; and

a touch panel.

9. The electronic device according to claim 8, wherein the touch panel is a capacitance type touch panel.

10. The pressure detection and display apparatus according to claim 2, wherein the upper electrode includes indium tin oxide or “

poly(3,4-ethylenedioxythiophene)”

.

11. The pressure detection and display apparatus according to claim 3, wherein the upper electrode includes indium tin oxide or “

poly(3,4-ethylenedioxythiophene)”

.

12. The pressure detection and display apparatus according to claim 2, wherein the lower electrode includes indium tin oxide or “

poly(3,4-ethylenedioxythiophene)”

.

13. The pressure detection and display apparatus according to claim 3, wherein the lower electrode includes indium tin oxide or “

poly(3,4-ethylenedioxythiophene)”

.

14. The pressure detection and display apparatus according to claim 4, wherein the lower electrode includes indium tin oxide or “

poly(3,4-ethylenedioxythiophene)”

.