Touch panel comprising a piezoelectric material

• US 9,831,871 B2
• Filed: 03/21/2013
• Issued: 11/28/2017
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Sang Young, Yun, Ji Sun, Lee, Yong Jin, Chai, Kyoung Hoon
• Primary Examiner(s): BLANCHA, JONATHAN M
• Application Number:
  US14/387,297
• Publication Number:
  US 20150090572A1
• Time in Patent Office: 1,713 Days
• Field of Search: 345173
• CPC Class Codes: G06F 3/04142 the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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
• CPC Class Codes: H03K 17/9622 using a plurality of detectors, e.g. keyboard
• CPC Class Codes: H03K 2217/96062 with tactile or haptic feedback
• CPC Class Codes: H03K 2217/960745 Capacitive differential; e.g. comparison with reference capacitance
• CPC Class Codes: H03K 2217/960755 Constructional details of capacitive touch and proximity switches
• CPC Class Codes: H10N 30/206 using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
• CPC Class Codes: H10N 30/857 Macromolecular compositions

Abstract

A touch panel according to the embodiment includes a substrate including an effective area and a dummy area surrounding the effective area; a transparent electrode on the substrate; and an outer dummy layer on the dummy area, wherein the outer dummy layer comprises a piezoelectric material.

Claims

1. A touch panel comprising:

a substrate including an effective area and a dummy area surrounding four surfaces of the effective area, wherein the four surfaces of the effective area include an up surface, a down surface, a left surface and a right surface;

a transparent electrode on the effective area of the substrate;

an outer dummy layer on the dummy area surrounding the up surface, the down surface, the left surface and the right surface of the effective area; and

a wire connected to the transparent electrode on the dummy area of the substrate;

wherein the outer dummy layer is disposed between the substrate and the wire,

wherein the outer dummy layer comprises a piezoelectric material having a color for preventing the wire from being seen from the outside, and

wherein an area of the outer dummy layer is larger than an area of the wire,

wherein the outer dummy layer comprise a plurality of outer dummy parts disposed on the substrate which are spaced apart from each other,

wherein the plurality of outer dummy parts comprise a plurality of first outer dummy parts, a plurality of second outer dummy parts, a plurality of third outer dummy parts, and a plurality of fourth outer dummy parts,

wherein the plurality of first outer dummy parts are disposed on the dummy area adjacent the up surface of the effective area, and the plurality of first outer dummy parts including at least three outer dummy parts spaced apart from each other,

wherein the plurality of second outer dummy parts are disposed on the dummy area adjacent the down surface of the effective area, and the plurality of second outer dummy parts including at least three outer dummy parts spaced apart from each other,

wherein the plurality of third outer dummy parts are disposed on the dummy area adjacent the left surface of the effective area, and the plurality of third outer dummy parts including at least three outer dummy parts spaced apart from each other,

wherein the plurality of fourth outer dummy parts are disposed on the dummy area adjacent the right surface of the effective area, and the plurality of fourth outer dummy parts including at least three outer dummy parts spaced apart from each other,

wherein each of the outer dummy parts is a single haptic actuator, and

wherein the plurality of outer dummy parts generate tactile sense feedbacks from a plurality of partial areas.

2. The touch panel of claim 1, wherein a gap between a first outer dummy part and a second outer dummy part of the plurality of first outer dummy parts is in a range of 0.1 μ

m to 3 μ

m.

3. The touch panel of claim 2, wherein the plurality of first outer dummy part includes a third outer dummy part placed adjacent to the second outer dummy part of the plurality of first outer dummy parts.

4. The touch panel of claim 1, wherein the piezoelectric material of the outer dummy layer comprises a piezoelectric polymer material.

5. The touch panel of claim 1, wherein the outer dummy layer comprises polyvinylidene fluoride (PVDF).

6. The touch panel of claim 1, wherein the outer dummy layer is placed between the transparent electrode and the substrate.

7. The touch panel of claim 1, wherein the transparent electrode is placed between the substrate and the outer dummy layer.

8. The touch panel of claim 1, wherein the outer dummy layer is placed on the transparent electrode.

9. The touch panel of claim 1, wherein the outer dummy layer generates tactile sense feedbacks to a plurality of partial areas.

10. The touch panel of claim 1, wherein the outer dummy layer generates an ultrasonic wave so that the substrate vibrate when an input touches.

11. The touch panel of claim 1, wherein the outer dummy layer is formed by patterning a piezoelectric film.

12. A touch panel comprising:

a substrate including an effective area and a dummy area surrounding four surfaces of the effective area, the four surfaces of the effective area including an up surface, a down surface, a left surface and a right surface;

a transparent electrode on the effective area of the substrate;

a pressure recognition layer on the dummy area; and

a wire connected to the transparent electrode on the dummy area of the substrate;

wherein the pressure recognition layer comprises a plurality of layers, wherein the plurality of layers includes a first pressure recognition layer and a second pressure recognition layer,

wherein the first pressure recognition layer and the second pressure recognition layer are disposed on the dummy area located by the up surface of the effective area,

wherein the first pressure recognition layer and the second pressure recognition layer are disposed on the dummy area located by the down surface of the effective area,

wherein the first pressure recognition layer and the second pressure recognition layer are disposed on the dummy area located by the left surface of the effective area,

wherein the first pressure recognition layer and the second pressure recognition layer are disposed on the dummy area located by the right surface of the effective area,

wherein the pressure recognition layer has a color, and

wherein the pressure recognition layer includes a piezoelectric material,

wherein the pressure recognition layer comprise a plurality of pressure recognition parts disposed on the substrate which are spaced apart from each other,

wherein the plurality of pressure recognition parts comprise a plurality of first pressure recognition parts, a plurality of second pressure recognition parts, a plurality of third pressure recognition parts and a plurality of fourth pressure recognition parts,

wherein the plurality of first pressure recognition parts are disposed on the dummy area adjacent the up surface of the effective area, and the plurality of first pressure recognition parts include at least three outer pressure recognition parts spaced apart from each other,

wherein the plurality of second pressure recognition parts are disposed on the dummy area adjacent to the down surface of the effective area, and the plurality of second pressure recognition parts include at least three outer pressure recognition parts spaced apart from each other,

wherein the plurality of third pressure recognition parts are disposed on the dummy area adjacent to the left surface of the effective area, and the plurality of third pressure recognition parts include at least three outer pressure recognition parts spaced apart from each other,

wherein the plurality of fourth pressure recognition parts are disposed on the dummy area adjacent to the right surface of the effective area, and the plurality of fourth pressure recognition parts include at least three outer pressure recognition parts spaced apart from each other, and

wherein each of the pressure recognition parts is a single haptic actuator,

wherein the plurality of pressure recognition parts generate tactile sense feedbacks from a plurality of partial areas.

13. The touch panel of claim 12, wherein a second pressure recognition part is spaced apart from a first pressure recognition part of the plurality of first pressure recognition parts, and a gap between the first pressure recognition part and the second pressure recognition part is in a range of 0.1 μ

m to 3 μ

m.

14. The touch panel of claim 13, wherein a third pressure recognition part placed adjacent to the second pressure recognition part of the plurality of first pressure recognition parts.

15. The touch panel of claim 14, wherein the second pressure recognition part is spaced apart from the third pressure recognition part.