DISPLAY DEVICE AND MANUFACTURING METHOD THEREOF

1 . A display device, comprising:

a liquid crystal panel including an upper substrate and a lower substrate that face each other with liquid crystals being disposed therebetween;

a first polarizing plate bonded to a front surface of the liquid crystal panel; and

a touch panel including a lower electrode formed on the upper substrate of the liquid crystal panel and an upper electrode formed on a back surface of the first polarizing plate;

wherein the liquid crystal panel further includes a thin film transistor formed on the lower substrate, a pixel electrode connected to the thin film transistor, a color filter formed on the lower substrate and a common electrode formed on the upper substrate and forming an electric field with the pixel electrode.

2 . The display device as set forth in claim 1 , wherein the touch panel further includes:

first and second signal supply lines formed on edges of the upper electrode;

third and fourth signal supply lines formed on edges of the lower electrode;

an insulation adhesive formed between the first and second signal supply lines and the third and fourth signal supply lines; and

a touch spacer formed on the upper electrode.

3 . The display device as set forth in claim 2 , wherein the touch panel further includes:

a first cell gap maintainer formed of the same material on a same plane as the first and second signal supply lines; and

a second cell gap maintainer formed of the same material on a same plane as the third and fourth signal supply lines.

4 . The display device as set forth in claim 1 , further comprising a second polarizing plate bonded to a back surface of the liquid crystal panel, wherein the second polarizing plate includes a lower polarizing film controlling the amount of transmission light and polarizing a state of incident light, and first supporting layers protecting and supporting front and back surfaces of the lower polarizing film, respectively.

5 . The display device as set forth in claim 4 , wherein the first polarizing plate includes:

an upper polarizing film controlling an amount of transmission light and polarizing a state of light emitted from the liquid crystal panel;

a second supporting layer protecting and supporting a back surface of the upper polarizing film; and

a third supporting layer protecting and supporting a front surface of the upper polarizing film.

6 . The display device as set forth in claim 5 , wherein the second supporting layer is formed of an unstretched film including one of triacetyl cellulose (“TAC”), ZEONOR, ES-CINA and ARTON.

7 . The display device as set forth in claim 2 , further comprising:

touch signal pads connected to the first to fourth signal supply lines, respectively;

liquid crystal signal pads formed on the lower substrate; and

a signal transmission film connecting the touch signal pads to the liquid crystal signal pads, respectively.

8 . A method of manufacturing a display device, the method comprising:

providing a liquid crystal panel including a lower substrate in which a thin film transistor, a color filter and a pixel electrode are formed and including an upper substrate in which a common electrode is formed, the lower and upper substrates facing each other with liquid crystals being disposed therebetween;

forming a lower electrode of a touch panel on a front surface of the upper substrate of the liquid crystal panel;

providing a polarizing plate polarizing incident light from the liquid crystal panel;

forming an upper electrode of the touch panel on a back surface of the polarizing plate; and

bonding the polarizing plate to the liquid crystal panel so that the upper electrode faces the lower electrode.

9 . The method as set forth in claim 8 , further comprising:

forming first and second signal supply lines on edges of the upper electrode;

forming a touch spacer on the upper electrode;

forming an insulation adhesive covering the first and second signal supply lines and a peripheral region of the polarizing plate; and

forming third and fourth signal supply lines on edges of the lower electrode.

10 . The method as set forth in claim 9 , wherein the first supply line is formed on a first edge and the second supply line is formed on a second edge and a third edge of the upper electrode, the first edge being adjacent to the second edge and the second edge being adjacent to the third edge;

wherein the third supply line is formed on a second edge and the fourth supply line is formed on a first edge and a fourth edge of the lower electrode, the second edge being adjacent to the first edge and the fourth edge being adjacent to the first edge; wherein the first edge and the second edge of the upper electrode corresponds to the first edge and the second edge of the lower electrode.

11 . The method as set forth in claim 10 , further comprising:

forming a first cell gap maintainer together with the first and second signal supply lines; and

forming a second cell gap maintainer together with the third and fourth signal supply lines.

12 . The method as set forth in claim 8 , wherein the providing a polarizing plate includes:

forming an upper polarizing film controlling an amount of transmission light and polarizing a state of light emitted from the liquid crystal panel; and

forming a supporting layer protecting and supporting a front and back surface of the upper polarizing film, respectively.

13 . The method as set forth in claim 12 , wherein the supporting layer formed on the back surface of the upper polarizing film is formed of an unstretched film including one of triacetyl cellulose (“TAC”), ZEONOR, ES-CINA and ARTON.

14 . The method as set forth in claim 9 , further comprising:

forming touch signal pads connected to the first to fourth signal supply lines, respectively;

forming liquid crystal signal pads on the lower substrate; and

connecting the touch signal pads to the liquid crystal signal pads with a signal transmission film.