TOUCH PANEL

• US 20140327847A1
• Filed: 11/12/2012
• Published: 11/06/2014
• Est. Priority Date: 11/30/2011
• Status: Abandoned Application

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Bong Jun, Yoon, Sun Hong, Lee, Yong Jin, Jin, Kwang Yong, Chai, Kyoung Hoon
• Application Number:
  US14/361,748
• Publication Number:
  US 20140327847A1
• Time in Patent Office: Days
• US Class Current: 349/12
• 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 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Abstract

Disclosed is a touch panel. The touch panel includes a first substrate; a second substrate spaced apart from the first substrate; an electrode on at least one of the first substrate and the second substrate for detecting a position; and a piezoelectric part having an elasticity which varies depending on an electric field induced by the electrode, wherein the piezoelectric part includes a base and particles distributed into the base, and the base includes a polymer material having elasticity.

Claims

1. A touch panel comprising:

a first substrate;

a second substrate spaced apart from the first substrate;

an electrode on at least one of the first substrate and the second substrate for detecting a position; and

a piezoelectric part having an elasticity which varies depending on an electric field induced by the electrode,

wherein the piezoelectric part includes a base and particles distributed into the base, and the base includes a polymer material having elasticity.

2. The touch panel of claim 1, wherein the polymer material includes a crosslink.

3. The touch panel of claim 2, wherein the polymer material has a di-electric constant of 3 F/m or more.

4. The touch panel of claim 2, wherein the polymer material has an amorphous property.

5. The touch panel of claim 1, wherein the polymer material includes polysiloxane.

6. The touch panel of claim 1, wherein the polymer material includes polydimethylsiloxanes (PDMS).

7. The touch panel of claim 1, wherein the polymer material includes a functional group.

8. The touch panel of claim 1, wherein the polymer material includes polydimethylsiloxanes (PDMS) including a functional group.

9. The touch panel of claim 1, wherein the particles include a conductive material.

10. The touch panel of claim 1, wherein the particles include silica.

11. The touch panel of claim 1, wherein the particles have a diameter in a range of 50 nm to 10 μ

m.

12. The touch panel of claim 1, wherein a volumetric ratio of the particles to the base is in a range of 5% to 30%.

13. The touch panel of claim 1, wherein the base has a refractive index corresponding to a refractive index of the particles.

14. The touch panel of claim 1, wherein the base has a refractive index equal to a refractive index of the particles.

15. The touch panel of claim 1, wherein the piezoelectric part has a thickness in a range of 100 μ

m to 4 mm.

16. The touch panel of claim 1, wherein the electrode comprises:

a first electrode on the first substrate, the first electrode extending in a first direction; and

a second electrode on the second substrate, the second electrode extending in a second direction crossing the first direction.

17. The touch panel of claim 1, wherein the piezoelectric part is placed between the first substrate and the second substrate.