λ/4 phase retardation film, display apparatus and manufacturing method thereof

1. A display apparatus comprising:

a polarizer having a transmitting axis and configured to linearly polarize external light to be parallel to the transmitting axis;

a phase retardation film under the polarizer and having a first optical axis;

a touch member under the phase retardation film and having a second optical axis parallel to the first optical; and

a display panel disposed under the touch member,

wherein, when a first in-plane retardation value of the phase retardation film is Rp 1 , a second in-plane retardation value of the touch member is Rp 2 , a target in-plane retardation value is Rp g , and ‘a’ is a constant, an equation Rp i =Rp g −a*Rp 2 is satisfied.

2. The display apparatus of claim 1 , wherein the touch member is between the phase retardation film and the display panel.

3. The display apparatus of claim 1 , wherein the touch member comprises a touch substrate under the polarizer and touch electrodes under the touch substrate.

4. The display apparatus of claim 1 , wherein an angle between the transmitting axis and the first optical axis is in a range of about 43° to about 47° or in a range of about 133° to about 137°.

5. The display apparatus of claim 1 , wherein the target in-plane retardation value Rp g has a value in a range of about 140 nm to about 200 nm.

6. The display apparatus of claim 1 , wherein the target in-plane retardation value has a value of about ¼ of a wavelength of the external light.

7. The display apparatus of claim 1 , wherein the constant ‘a’ has a value in a range of about 1 to about 3.

8. The display apparatus of claim 1 , wherein the phase retardation film comprises:

an A plate having the first in-plane retardation value; and

a positive C plate on the A plate and having a first thickness retardation value, and

wherein, when the first thickness retardation value of the positive C plate is Rth 1 , a second thickness retardation value of the touch member is Rth 2 , and a target thickness retardation value is Rth g , an equation Rth 1 =Rth g −Rth 2 is satisfied.

9. A method of manufacturing a display apparatus, the method comprising:

aligning a phase retardation film having a first optical axis and a touch member having a second optical axis such that the first optical axis and the second optical axis are parallel to each other;

coupling the phase retardation film and the touch member to each other; and

placing the phase retardation film and the touch member between a polarizer and a display panel,

wherein the aligning of the phase retardation film and the touch member comprises:

determining a target in-plane retardation value; and

setting a first in-plane retardation value of the phase retardation film according to the target in-plane retardation value and a second in-plane retardation value of the touch member.

10. The method of claim 9 , wherein the manufacturing of the touch member further comprises:

manufacturing a touch substrate; and

arranging touch electrodes on the touch substrate.

11. The method of claim 9 , wherein the polarizer has a transmitting axis, and

wherein an angle between the transmitting axis and the first optical axis of the polarizer is in a range of about 43° to about 47° or in a range of about 133° to about 137°.

12. The method of claim 9 , wherein the first in-plane retardation value (Rp 1 ) of the phase retardation film satisfies an equation Rp 1 =Rp g −a*Rp 2 , where Rp 2 is the second in-plane retardation value of the touch member, Rp g is the target in-plane retardation value, and ‘a’ is a constant.

13. The method of claim 9 , wherein the setting of the first in-plane retardation value comprises setting a refractivity of the phase retardation film according to the target in-plane retardation value and the second in-plane retardation value.

14. The method of claim 9 , wherein the setting of the first in-plane retardation value comprises setting a thickness of the phase retardation film according to the target in-plane retardation value and the second in-plane retardation value.

15. The method of claim 9 , wherein the target in-plane retardation value (Rp g ) has a value in a range of about 140 nm to about 200 nm.

16. The method of claim 9 , wherein the target in-plane retardation value has a value of about ¼ of a wavelength of an external light.

17. The method of claim 9 , wherein the phase retardation film comprises:

an A plate having the first in-plane retardation value; and

a positive C plate on the A plate and having a first thickness retardation value,

wherein, when Rth 2 is a second thickness retardation value of the touch member, and Rth g is a target thickness retardation value, the first thickness retardation value (Rth 1 ) of the positive C plate satisfies an equation Rth 1 =Rth g −Rth 2 .

18. A display apparatus comprising:

a polarizer having a transmitting axis and configured to linearly polarize external light to be parallel to the transmitting axis;

a touch member under the polarizer and having a first optical axis;

a phase retardation film under the touch member and having a second optical axis parallel to the first optical axis; and

a display panel disposed under the touch member,

wherein, when a first in-plane retardation value of the phase retardation film is Rp 1 , a second in-plane retardation value of the touch member is Rp 2 , a target in-plane retardation value is Rp g , and ‘a’ is a constant, an equation Rp 1 =Rp g −a*Rp 2 is satisfied.