DISPLAY APPARATUS

• US 20170090649A1
• Filed: 05/05/2016
• Published: 03/30/2017
• Est. Priority Date: 09/30/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: LEE, Hyunhee
• Granted Patent: US 9,874,773 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• 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 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A display apparatus includes a display panel configured to display an image; a touch panel on the display panel and including a touch region configured to extract a touch coordinate when a touch is generated thereon, and a non-touch region adjacent to the touch region; a cover glass on the touch panel; a piezoelectric element on the cover glass and covering the touch region, the piezoelectric element being configured to generate an electrical change by a pressure of the touch; and a pressure calculating unit configured to calculate a magnitude of the pressure based on the generated electrical change.

Claims

1. A display apparatus comprising:

a display panel configured to display an image;

a touch panel on the display panel and including a touch region configured to extract a touch coordinate when a touch is generated thereon, and a non-touch region adjacent to the touch region;

a cover glass on the touch panel;

a piezoelectric element on the cover glass and covering the touch region, the piezoelectric element being configured to generate an electrical change by a pressure of the touch; and

a pressure calculating unit configured to calculate a magnitude of the pressure based on the generated electrical change.

2. The display apparatus of claim 1, wherein the piezoelectric element has a larger area than the touch region of the touch panel.

3. The display apparatus of claim 1, further comprising a transparent film on the piezoelectric element and the cover glass and covering the piezoelectric element.

4. The display apparatus of claim 1, wherein the electrical change is a change in a voltage.

5. The display apparatus of claim 1, wherein the piezoelectric element comprises at least one of α

-AlPO₄ (berlinite), α

-SiO₂ (quartz), LiTaO₃, LiNbO₃, Sr_xBa_yNb₂O₈, Pb₅—

Ge₃O₁₁, Tb₂(MoO₄)₃, Li₂B₄O₇, CdS, ZnO, Bi₁₂SiO₂₀, or Bi₁₂GeO₂₀.

6. The display apparatus of claim 1, wherein the piezoelectric element comprises at least one of a PZT ceramic, a PT ceramic, a PZT-complex perovskite-based structure, or BaTiO₃.

7. The display apparatus of claim 1, wherein the piezoelectric element comprises at least one of ZnO, CdS, or AlN.

8. The display apparatus of claim 1, wherein the piezoelectric element comprises at least one of PVDF, P(VDF-TrFe), P(VDFTeFE), or TGS.

9. The display apparatus of claim 1, wherein the piezoelectric element comprises at least one of PZT-PVDF, PZT-silicone rubber, PZT-epoxy, PZT-polymer foam, or PZT-urethane foam.

10. The display apparatus of claim 1, wherein the touch panel comprises:

sensing electrodes; and

driving electrodes electrically insulated from the sensing electrodes.

11. The display apparatus of claim 10,

wherein the touch panel further comprises:

a glass substrate on the display panel; and

an insulating layer between the glass substrate and the cover glass,

wherein the sensing electrodes are between the glass substrate and the insulating layer, and the driving electrodes are between the insulating layer and the cover glass, and

wherein the display apparatus further comprises;

a first adhesive bonding the touch panel and the display panel to each other; and

a second adhesive bonding the touch panel and the cover glass to each other.

12. The display apparatus of claim 10,

wherein the touch panel further comprises a glass substrate on the display panel, wherein the sensing electrodes are between the glass substrate and the display panel, and the driving electrodes are between the glass substrate and the cover glass, and

wherein the display apparatus further comprises:

a first adhesive bonding the touch panel and the display panel to each other; and

a second adhesive bonding the touch panel and the cover glass to each other.

13. The display apparatus of claim 10,

wherein the touch panel further comprises an insulating layer on the display panel, wherein the sensing electrodes are between the display panel and the insulating layer, and the driving electrodes are between the insulating layer and the cover glass, and

wherein the display apparatus further comprises an adhesive bonding the display panel and the touch panel to each other.

14. The display apparatus of claim 10, wherein the touch panel further comprises:

a first PET film on the display panel;

a second PET film on the first PET film; and

a second adhesive on the sensing electrodes,

wherein the sensing electrodes are between the first and second PET films, the driving electrodes are between the second PET film and the cover glass, and the second adhesive is between the sensing electrodes and the second PET film and bonding the sensing electrodes and the second PET film to each other, and

wherein the display apparatus further comprises;

a first adhesive bonding the display panel and the touch panel to each other; and

a third adhesive bonding the touch panel and the cover glass to each other.

15. The display apparatus of claim 10, wherein the touch panel further comprises:

a PET film on the display panel; and

a second adhesive on the PET film,

wherein the sensing electrodes are between the PET film and the cover glass, the driving electrodes are between the sensing electrodes and the cover glass, and the second adhesive is between the sensing electrodes and the driving electrodes, insulates the sensing electrodes from the driving electrodes and bonding the sensing electrodes and the driving electrodes to each other, and

wherein the display apparatus further comprises a first adhesive bonding the display panel and the touch panel to each other.

16. The display apparatus of claim 10,

wherein the touch panel further comprises a PET film on the display panel,

wherein the sensing electrodes are between the display panel and the PET film, and the driving electrodes are between the PET film and the cover glass, and

wherein the display apparatus further comprises:

a first adhesive bonding the display panel and the touch panel to each other; and

a second adhesive bonding the touch panel and the cover glass to each other.

17. The display apparatus of claim 10,

wherein the touch panel further comprises an insulating layer on the display panel,

wherein the sensing electrodes are between the display panel and the insulating layer, and the driving electrodes are between the insulating layer and the cover glass, and

wherein the display apparatus further comprises an adhesive bonding the touch panel and the cover glass to each other.

18. A display apparatus comprising:

a display panel configured to display an image and including a touch region configured to extract a touch coordinate when a touch is generated thereon, and a non-touch region adjacent to the touch region;

a cover glass on the display panel;

a piezoelectric element on the cover glass and covering the touch region, the piezoelectric element being configured to generate an electrical change by a pressure of the touch; and

a pressure calculating unit configured to calculate a magnitude of the pressure based on the generated electrical change.

19. The display apparatus of claim 18, wherein the display panel comprises:

a thin film transistor (TFT) substrate;

a color filter substrate on the thin film transistor (TFT) substrate;

a liquid crystal layer between the thin film transistor (TFT) substrate and the color filter substrate;

sensing electrodes between the thin film transistor (TFT) substrate and the liquid crystal layer;

driving electrodes between the sensing electrodes and the liquid crystal layer; and

an insulating layer between the sensing electrodes and the driving electrodes.

20. The display apparatus of claim 19, further comprising an adhesive bonding the display panel and the cover glass to each other.