Light guide plate and liquid crystal display having the same

1. A liquid crystal display apparatus comprising:

a liquid crystal display panel for displaying an image; and

a touch panel including

i) a first retardation member being disposed on an upper surface of the liquid crystal display panel,

ii) a first transparent electrode disposed directly on the first retardation member

iii) a second transparent electrode separated from the first transparent electrode by a predetermined distance,

iv) a second retardation member disposed on the second transparent electrode, and

v) a first polarizing member disposed on the second retardation member, and the touch panel detecting a point where the first transparent electrode is electrically connected to the second transparent electrode to detect a position of an object that touches an outer surface of the touch panel.

2. The liquid crystal display apparatus of claim 1 , wherein the first retardation member is a λ/4 retardation film, and the second retardation member is a λ/2 retardation film.

3. The liquid crystal display apparatus of claim 2 , wherein a first retardation axis of the first retardation member forms a first angle between about 90° and about 180° with respect to a polarizing axis of the first polarizing member, and a second retardation axis of the second retardation member forms a second angle between about 45° and about 135° with respect to the polarizing axis of the first polarizing member.

4. The liquid crystal display apparatus of claim 1 , wherein the touch panel further includes a spacer disposed between the first and second transparent electrodes, the spacer having a diameter from about 10 μm to about 80 μm and a height from about 2 μm to about 10 μm.

5. The liquid crystal display apparatus of claim 1 , wherein the liquid crystal display panel further includes a hard coated film, disposed on the first polarizing member, for protecting the first polarizing member.

6. The liquid crystal display apparatus of claim 1 , wherein the liquid crystal display panel further includes a reflection protection film, disposed on the first polarizing member, for preventing a light from being reflected from a surface of the first polarizing member.

7. The liquid crystal display apparatus of claim 6 , wherein the reflection protection film has a Mohs hardness of no less than about 3.

8. The liquid crystal display apparatus of claim 1 , wherein the touch panel further includes:

a hard coated film, disposed on the first polarizing member, for protecting the first polarizing member; and

a reflection protection film, disposed on the hard coated film, for removing a light reflected from a surface of the hard coated film.

9. The liquid crystal display apparatus of claim 1 , wherein the liquid crystal display apparatus further includes:

a third retardation member disposed on a lower surface of the liquid crystal display panel;

a fourth retardation member disposed on a lower surface of the third retardation member; and

a second polarizing member disposed on a lower surface of the fourth retardation member.

10. The liquid crystal display apparatus of claim 9 , wherein the first and third retardation members are λ/4 retardation films, and the second and fourth retardation members are λ/2 retardation films.

11. The liquid crystal display apparatus of claim 9 , wherein the first, second, third and fourth retardation members comprise polyarylate.

12. The liquid crystal display apparatus of claim 2 , wherein the first and third retardation members comprise polyether sulfone.

13. A liquid crystal display apparatus comprising:

a liquid crystal display panel for displaying an image; and

a touch panel including

i) a first transparent electrode disposed on an upper surface of the liquid crystal display panel,

ii) a second transparent electrode separated from the first transparent electrode by a predetermined distance,

iii) a first retardation member disposed directly on the second transparent electrode,

iv) a second retardation member disposed on the first retardation member, and

v) a first polarizing member disposed on the second retardation member, and the touch panel detecting a point at which the first transparent electrode is electrically connected to the second transparent electrode to detect a position of an object that touches an outer surface of the touch panel.

14. The liquid crystal display apparatus of claim 13 , wherein the first retardation member is a λ/2 retardation film, and the second retardation member is a λ/4 retardation film.

15. The liquid crystal display apparatus of claim 14 , wherein a first retardation axis of the first retardation member forms a first angle between about 90° and about 180° with respect to a polarizing axis of the first polarizing member, and a second retardation axis of the second retardation member forms a second angle between about 45° and about 135° with respect to the polarizing axis of the first polarizing member.

16. The liquid crystal display apparatus of claim 13 , wherein the liquid crystal display apparatus further includes:

a third retardation member disposed on a lower surface of the liquid crystal display panel;

a fourth retardation member disposed on a lower surface of the third retardation member; and

a second polarizing member disposed on a lower surface of the fourth retardation member.

17. The liquid crystal display-apparatus of claim 13 , wherein the first and third retardation members are λ/4 retardation films, and the second and fourth retardation members are λ/2 retardation films.