Optical display device module and optical display device comprising same
Provided are an optical display device module and an optical display device comprising same, the module comprising: an optical display device panel; and a first polarizer, a first retardation layer, and a second retardation layer that are sequentially stacked, wherein the second retardation layer is disposed inside the panel for the optical display device, the slow axis of the first retardation layer forms −5° to +5° with respect to the absorption axis of the first polarizer, the slow axis of the second retardation layer forms −5° to +5° with respect to the absorption axis of the first polarizer, the second retardation layer includes a positive A retardation layer of which the biaxial degree is 0.9 to 1.1 at a wavelength of 550 nm, and the first retardation layer includes a positive B retardation layer of which the biaxial degree is −1 to −0.2 at a wavelength of 550 nm.
1 . An optical display module comprising: an optical display panel; and a first polarizer, a first retardation layer and a second retardation layer sequentially stacked, wherein the first retardation layer and the second retardation layer are configured together as an optical compensation structure;
wherein the optical display panel comprises a layer comprising an image display medium, and
wherein the second retardation layer is directly formed on an inner substrate of the optical display panel coated on a surface inside the optical display panel and has a thickness of 0.5 μm to 2 μm;
a slow axis of the first retardation layer and a slow axis of the second retardation layer are each aligned at 0° with respect to a light absorption axis of the first polarizer;
the second retardation layer comprises a positive A retardation layer having a degree of biaxiality (NZ) of 1.0 and an in-plane retardation (Re) of 90 nm to 110 nm at a wavelength of 550 nm; and
the first retardation layer comprises a positive B retardation layer having a degree of biaxiality (NZ) of −0.6 to −0.2 and an in-plane retardation (Re) of 60 nm to 80 nm at a wavelength of 550 nm,
wherein the first retardation layer is formed of a material having negative (−) birefringence,
wherein the material having negative (−) birefringence comprises at least one selected from among a non-modified styrene based resin, a modified styrene based resin, a maleimide based resin, and a fumaric acid ester based resin, wherein the first retardation layer comprises a film comprising a cyclic olefin polymer or a cyclic olefin copolymer and subjected to TD uniaxial stretching.
2 . The optical display module according to claim 1 , wherein each of the first polarizer and the first retardation layer is disposed outside the optical display panel.
3 . The optical display module according to claim 1 , wherein the slow axis of the first retardation layer is tilted at an angle of 0° to 5° with respect to a machine direction (MD) of the first retardation layer.
4 . The optical display module according to claim 1 , wherein the first retardation layer comprises a film comprising the material having negative (−) birefringence and subjected to TD uniaxial stretching.
5 . The optical display module according to claim 1 , further comprising:
an adhesive layer, a bonding layer or an adhesive/bonding layer between the first polarizer and the first retardation layer.
6 . The optical display module according to claim 1 , wherein the second retardation layer is formed of a liquid crystalline composition containing a reactive mesogen.
7 . The optical display module according to claim 1 , wherein the image display medium comprises a liquid crystal layer.
8 . The optical display module according to claim 7 , wherein the slow axis of the second retardation layer is tilted at an angle of +85° to +95° with reference to an alignment direction of liquid crystal molecules in a non-electric field state in the liquid crystal layer.
9 . The optical display module according to claim 7 , wherein an alignment direction of liquid crystal molecules in a non-electric field state in the liquid crystal layer is tilted at an angle of +85° to +95° with reference to the light absorption axis of the first polarizer.
10 . The optical display module according to claim 7 , wherein, the first polarizer, the first retardation layer, the second retardation layer, and the liquid crystal layer are sequentially formed in the stated order.
11 . The optical display module according to claim 7 , wherein the liquid crystal layer comprises liquid crystals in a horizontal alignment mode.
12 . The optical display module according to claim 1 , further comprising:
a second polarizer disposed at an opposite side to the first polarizer with reference to the optical display panel,
wherein a light absorption axis of the second polarizer is tilted at an angle of +85° to +95° with reference to the light absorption axis of the first polarizer.
13 . An optical display device comprising the optical display module according to claim 1 .
14 . The optical display module according to claim 1 , wherein the second retardation layer is spaced apart from and adjacent the layer comprising the image display medium.