Display apparatus including phase retardation and phase compensation layers
A display apparatus includes a display panel including a display element and a thin-film encapsulation layer disposed on the display element, and a polarization film disposed on the display panel and including a polarization layer, a phase retardation layer, and a phase compensation layer, wherein a thickness direction phase difference C Rth of the phase compensation layer satisfies Equation: C Rth =−((Re×sin 2 (2⊖)×NZ)/2+A Rth ).
1 . A display apparatus comprising:
a display panel comprising a display element and a thin-film encapsulation layer disposed on the display element; and
a polarization film disposed on the display panel and comprising a polarization layer, a phase retardation layer, and a phase compensation layer,
wherein a thickness direction phase difference C Rth of the phase compensation layer satisfies Equation:
C Rth =−(( Re ×sin 2 (2⊖)× NZ )/2+ A Rth ),
where Re is (Ne−No)×d, ⊖ is an angle between a slow axis of the phase retardation layer and a transmission axis of the polarization layer, NZ is (Nx−Nz)/(Nx−Ny), A Rth is a thickness direction phase difference of the display panel, Ne is an extraordinary refractive index of the phase retardation layer, No is an ordinary refractive index of the phase retardation layer, Nx is an x-direction refractive index of the phase retardation layer, Ny is a y-direction refractive index of the phase retardation layer, Nz is a z-direction refractive index of the phase retardation layer, and d is a thickness of the phase retardation layer.
2 . The display apparatus of claim 1 , wherein the ⊖ is in a range of about 350 to about 55°.
3 . The display apparatus of claim 1 , wherein the Re is in a range of about 132 nm to about 152 nm at a wavelength of 550 nm.
4 . The display apparatus of claim 1 , wherein the A Rth is in a range of about −60 nm to about +10 nm.
5 . The display apparatus of claim 1 , wherein Re(550) at a wavelength of 550 nm and Re(450) at a wavelength of 450 nm satisfy Equation:
0.8 ≤Re (450)/ Re (550)≤1.
6 . The display apparatus of claim 1 , wherein Re(650) at a wavelength of 650 nm and Re(550) at a wavelength of 550 nm satisfy Equation:
1 ≤Re (650)/ Re (550)≤1.2.
7 . The display apparatus of claim 1 , wherein
the phase compensation layer is disposed on the display panel,
the phase retardation layer is disposed on the phase compensation layer, and
the polarization layer is disposed on the phase retardation layer.
8 . The display apparatus of claim 1 , wherein
the phase retardation layer is disposed on the display panel,
the phase compensation layer is disposed on the phase retardation layer, and
the polarization layer is disposed on the phase compensation layer.
9 . The display apparatus of claim 1 , wherein the thin-film encapsulation layer comprises at least one inorganic encapsulation layer and at least one organic encapsulation layer.
10 . The display apparatus of claim 9 , wherein the thin-film encapsulation layer comprises:
a first inorganic encapsulation layer comprising at least one inorganic material, and
a second inorganic encapsulation layer comprising at least one inorganic material.
11 . The display apparatus of claim 1 , further comprising a resin layer disposed on the thin-film encapsulation layer.
12 . The display apparatus of claim 1 , further comprising an encapsulation substrate disposed on the thin-film encapsulation layer.
13 . The display apparatus of claim 1 , wherein the display element comprises a pixel electrode, an emission layer, and a counter electrode.
14 . The display apparatus of claim 13 , further comprising a capping layer disposed on the counter electrode.
15 . A display apparatus comprising:
a substrate;
a display element disposed on the substrate and comprising a pixel electrode, an emission layer, and a counter electrode;
a capping layer disposed on the display element;
a thin-film encapsulation layer disposed on the capping layer and comprising at least one inorganic encapsulation layer and at least one organic encapsulation layer;
a resin layer disposed on the thin-film encapsulation layer; and
a polarization film disposed on the resin layer and comprising a phase compensation layer, a phase retardation layer, and a polarization layer.
16 . The display apparatus of claim 15 , wherein the thin-film encapsulation layer comprises:
a first inorganic encapsulation layer comprising at least one inorganic material,
an organic encapsulation layer, and
a second inorganic encapsulation layer comprising at least one inorganic material.
17 . The display apparatus of claim 15 , further comprising an encapsulation substrate disposed on the resin layer.
18 . The display apparatus of claim 15 , wherein
the phase compensation layer is disposed on the resin layer,
the phase retardation layer is disposed on the phase compensation layer, and
the polarization layer is disposed on the phase retardation layer.
19 . The display apparatus of claim 15 , wherein
the phase retardation layer is disposed on the resin layer,
the phase compensation layer is disposed on the phase retardation layer, and
the polarization layer is disposed on the phase compensation layer.
20 . The display apparatus of claim 15 , wherein the polarization film further comprises:
a first protective layer disposed on the polarization layer, and
a second protective layer disposed between the polarization layer and the phase retardation layer.