Touch panel having a speaker function

1. A touch panel comprising:

a first supporting substrate;

a second supporting substrate that faces the first supporting substrate;

a first transparent electrode formed on the first supporting substrate;

a second transparent electrode formed on the second supporting substrate;

a third transparent electrode formed between the first and second transparent electrodes;

a medium layer formed between the first and third transparent electrodes; and

a piezoelectric layer formed between the second and third transparent electrodes, wherein a first surface of the piezoelectric layer is in direct contact with the second transparent electrode, and a second surface of the piezoelectric layer opposing the first surface is in direct contact with the third transparent electrode.

2. The touch panel of claim 1 , wherein each of the first and second supporting substrates comprises a glass substrate, a plastic substrate, an optical film or a polarizer.

3. The touch panel of claim 1 , wherein the piezoelectric layer comprises a poly vinylidene fluoride, a poly-a-methyl-l-glutamate, a poly vinyl chloride or a poly tri-fluoro ethylene.

4. The touch panel of claim 1 , wherein a thickness of the medium layer is substantially equal to or more than about 20 μm.

5. The touch panel of claim 1 , wherein the medium layer includes air.

6. The touch panel of claim 1 , wherein the medium layer further comprises a supporting member disposed between the first and third transparent electrodes.

7. The touch panel of claim 6 , wherein the supporting member is formed through a spacer scattering method.

8. The touch panel of claim 6 , wherein the supporting member is formed through irradiating ultraviolet light after applying a photosensitive film.

9. The touch panel of claim 6 , wherein the supporting member is formed using a mold after applying a photosensitive film.

10. A touch panel comprising:

a speaker section comprising:

a first supporting substrate;

a second supporting substrate that faces the first supporting substrate;

a first medium layer formed on the first supporting substrate, the first medium layer having a first supporting member;

a first transparent electrode formed adjacent to the first medium layer and opposite to the first supporting substrate;

a second transparent electrode formed adjacent to the second supporting substrate; and

a piezoelectric layer formed between the first and second transparent electrodes, wherein the first medium layer converts an oscillation received from the piezoelectric layer into a sound through resonance and amplification of the oscillation; and

a touch panel section comprising:

the second supporting substrate;

a third supporting substrate formed opposite to the second supporting substrate;

a third transparent electrode formed adjacent to the second supporting substrate and opposite to the second transparent electrode;

a fourth transparent electrode formed adjacent to the third transparent electrode; and

a second medium layer formed between the third and the fourth transparent electrodes.

11. The touch panel of claim 10 , wherein each of the first supporting substrate, the second supporting substrate and the third supporting substrate comprises a glass substrate, a plastic substrate, an optical film or a polarizer.

12. The touch panel of claim 10 , wherein the piezoelectric layer comprises a poly vinylidene fluoride, a poly-a-methyl-l-glutamate, a poly vinyl chloride or a poly tri-fluoro ethylene.

13. The touch panel of claim 10 , wherein a thickness of the first medium layer is equal to or more than about 20 μm.

14. The touch panel of claim 10 , wherein the first medium layer and the second medium layer include air.

15. The touch panel of claim 10 , wherein the second medium layer further includes a second supporting member formed on the third transparent electrode.

16. The touch panel of claim 15 , wherein the first supporting member and the second supporting member are formed through a spacer scattering method.

17. The touch panel of claim 15 , wherein the first supporting member and the second supporting member are formed through irradiating ultraviolet light after applying a photosensitive film.

18. The touch panel of claim 15 , wherein the first supporting member and the second supporting member are formed using a mold after applying a photosensitive film.

19. A liquid crystal display apparatus, comprising:

a display panel;

a driving circuit member applying an image signal to the display panel; and

a touch panel, comprising:

a first supporting substrate;

a second supporting substrate that faces the first supporting substrate;

a first transparent electrode formed on the first supporting substrate;

a second transparent electrode formed on the second supporting substrate;

a third transparent electrode formed between the first and second transparent electrodes;

a medium layer formed between the first and third transparent electrodes; and

a piezoelectric layer formed between the second and third transparent electrodes, wherein a first surface of the piezoelectric layer is in direct contact with the second transparent electrode, and a second surface of the piezoelectric layer opposing the first surface is in direct contact with the third transparent electrode.

20. The liquid crystal display apparatus of claim 19 , wherein each of the first supporting substrate and the second supporting substrate comprises a glass substrate, a plastic substrate, an optical film, or a polarizer.

21. The liquid crystal display apparatus of claim 19 , wherein the piezoelectric layer comprises a poly vinylidene fluoride, a poly-a-methyl-l-glutamate, a poly vinyl chloride or a poly tri-fluoro ethylene.

22. The liquid crystal display apparatus of claim 19 , wherein the medium layer includes air.