Organic light emitting diode display
An organic light emitting diode display including: a display panel; a first retarder on the display panel and including a first reactive liquid crystal; a second retarder on the first retarder and including a second reactive liquid crystal; and a polarizer on the second retarder, wherein a first optical axis of the first reactive liquid crystal is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second reactive liquid crystal is inclined by θ relative to the absorption axis of the polarizer.
1. An organic light emitting diode display, comprising:
a display panel;
a first retarder on the display panel;
a second retarder on the first retarder; and
a polarizer on the second retarder,
wherein a first optical axis of the first retarder is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second retarder is inclined by θ relative to the absorption axis of the polarizer; and
wherein the first retarder comprises a first reactive liquid crystal and the second retarder comprises a second reactive liquid crystal.
2. The organic light emitting diode display of claim 1 , wherein:
the first retarder has a λ/4 phase difference value and the second retarder has a λ/2 phase difference value.
3. The organic light emitting diode display of claim 1 , wherein:
the first retarder comprises a liquid crystal coating layer, and
the second retarder comprises a liquid crystal coating layer and/or an oriented film layer.
4. The organic light emitting diode display of claim 3 , wherein:
the liquid crystal coating layer comprises a reverse wavelength dispersion liquid crystal.
5. The organic light emitting diode display of claim 4 , wherein:
the liquid crystal coating layer comprises a photo-alignment layer and a liquid crystal layer aligned on the photo-alignment layer.
6. The organic light emitting diode display of claim 5 , wherein:
the liquid crystal coating layer comprises reactive mesogen.
7. The organic light emitting diode display of claim 3 , wherein:
the liquid crystal coating layer is an A-Plate liquid crystal coating layer.
8. The organic light emitting diode display of claim 7 , wherein:
the A-plate comprises a material selected from a group consisting of triacetyl cellulose (TAC), cycloolefin polymer (COP), cycloolefin copolymer (COC), polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polysulfone (PSF), and a polymethyl methacrylate (PMMA).
9. The organic light emitting diode display of claim 7 , wherein:
the A-plate has a structure in which polymethyl methacrylate (PMMA), polystyrene (PS), and polymethyl methacrylate (PMMA) are sequentially stacked.
10. The organic light emitting diode display of claim 3 , wherein:
the second retarder comprises the oriented film layer and
the oriented film layer is a triacetyl cellulose (TAC)-based, polycarbonate (PC)-based, polymethyl(meta)acrylate-based, polyethylene terephthalate-based, and/or cycloolefin (COP)-based polymer layer.
11. The organic light emitting diode display of claim 1 , wherein:
the polarizer is a linear polarizer.
12. The organic light emitting diode display of claim 1 , further comprising:
a first pressure sensitivity adhesive between the first retarder and the second retarder.
13. The organic light emitting diode display of claim 1 , further comprising:
a second pressure sensitivity adhesive between the second retarder and the polarizer.
14. An organic light emitting diode display, comprising:
a display panel;
a first retarder on the display panel;
a second retarder on the first retarder; and
a polarizer on the second retarder,
wherein a first optical axis of the first retarder is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second retarder is inclined by θ relative to the absorption axis of the polarizer; and
wherein a thickness of the first retarder is two times as large as that of the second retarder.
15. The organic light emitting diode display of claim 14 , wherein:
the thickness of the first retarder and the thickness of the second retarder meet the following Equation 1:
(
Δ
n
′
(
λ
)
Δ
n
′
(
550
m
)
-
1
)
f
irst
retarder
=
2
x
(
Δ
n
″
(
λ
)
Δ
n
″
(
550
m
)
-
1
)
s
econd
retarder
Equation
1
wherein Δn′ represents a phase difference value in a thickness direction for λ in the first retarder and Δn″ represents a phase difference value in a thickness direction for λ in the second retarder.
16. An organic light emitting diode display, comprising:
a display panel;
a first retarder on the display panel;
a second retarder on the first retarder; and
a polarizer on the second retarder,
wherein a first optical axis of the first retarder is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second retarder is inclined by θ relative to the absorption axis of the polarizer; and
wherein the first retarder and the second retarder are each a film patterned retarder (FPR) which comprises a plurality of left retarder patterns and a plurality of right retarder patterns.
17. An organic light emitting diode display, comprising:
a display panel;
a first retarder on the display panel;
a second retarder on the first retarder; and
a polarizer on the second retarder,
wherein a first optical axis of the first retarder is inclined by 2θ+45° relative to an absorption axis of the polarizer, and a second optical axis of the second retarder is inclined by θ relative to the absorption axis of the polarizer;
wherein the first retarder comprises a first reactive liquid crystal and the second retarder comprises a second reactive liquid crystal; and
wherein the display panel is flexible, bendable, rollable, foldable, and/or stretchable.