Optical film for reducing color shift and organic light-emitting display device employing the same
View Patent ↗An optical film includes: a high refractive index pattern layer including a material having a refractive index greater than about 1, where a plurality of grooves, each having a curved groove surface and a depth greater than a width thereof, is defined on a first surface of the high refractive index pattern layer, the plurality of grooves defines a pattern, the plurality of grooves are two-dimensionally arranged in a first direction and a second direction, and a first distance between adjacent grooves in the first direction and a second distance between adjacent grooves in the second direction are different from each other; and a low refractive index pattern layer including a material having a refractive index less than the refractive index of the high refractive index pattern layer and further including a plurality of fillers which fills the plurality of grooves, respectively.
1. An optical film comprising:
a high refractive index pattern layer comprising a material having a refractive index greater than about 1,
wherein a plurality of grooves is defined on a first surface of the high refractive index pattern layer, the plurality of grooves defines a pattern of the high refractive index pattern layer, the plurality of grooves is repeatedly arranged along a first direction and is repeatedly arranged along a second direction; and
a low refractive index pattern layer comprising a plurality of fillers corresponding to the plurality of grooves and a flat portion which connects the plurality of fillers, the plurality of fillers and the flat portion comprising a material having a refractive index less than the refractive index of the high refractive index pattern layer,
wherein light incident through the low refractive index pattern layer is emitted through the high refractive index pattern layer,
wherein a distance between two adjacent grooves in the first direction is defined as a first distance, and a distance between two adjacent grooves is defined as a second distance, and
wherein an average of first distances among all adjacent grooves in the first direction and an average of second distances among all adjacent grooves in the second direction are different from each other.
2. The optical film of claim 1 , wherein a cross-sectional shape of each of the plurality of grooves in the first surface is an isotropic shape.
3. The optical film of claim 1 , wherein the plurality of grooves is arranged in a quadrangular form.
4. The optical film of claim 3 , wherein the plurality of grooves are arranged in a rectangular form.
5. The optical film of claim 1 , wherein
the plurality of grooves is arranged along a plurality of straight lines, the plurality of straight lines extending in the first direction and being spaced apart from one another in the second direction, and
the grooves on adjacent straight lines of the plurality of straight lines are alternately disposed in a zigzag manner.
6. The optical film of claim 1 , wherein an area ratio of an area of the pattern to an area of a boundary surface between the high refractive index pattern layer and the low refractive index pattern layer is equal to or greater than about 25% and equal to or less than about 50%.
7. The optical film of claim 1 , wherein a ratio of the depth to the width of each of the plurality of grooves is in a range from about 2 to about 2.8.
8. The optical film of claim 1 , further comprising:
an anti-reflection film disposed on a second surface of the high refractive index pattern layer, which is opposite to the first surface; and
an adhesive layer disposed on the low refractive index pattern layer.
9. The optical film of claim 8 , further comprising:
a circular polarization film disposed between the high refractive index pattern layer and the anti-reflection film, and comprising a phase shift layer and a linear polarization layer.
10. The optical film of claim 8 , further comprising:
a transmittance-adjusting layer disposed between the high refractive index pattern layer and the anti-reflection film.
11. An organic light-emitting display device comprising:
an organic light-emitting panel comprising a plurality of pixels comprising organic light-emitting layers, wherein the organic light-emitting layers emit light of different wavelengths from each other, and each of the plurality of pixels has a microcavity structure which resonates light corresponding to one of the different wavelengths; and
the optical film of claim 1 disposed on the organic light-emitting panel.
12. The organic light-emitting display device of claim 11 , wherein the first direction and the second direction, in which the plurality of grooves is two-dimensionally arranged, respectively correspond to a horizontal direction and a vertical direction of the organic light-emitting panel.
13. The organic light-emitting display device of claim 12 , wherein the second distance is less than the first distance.
14. The organic light-emitting display device of claim 11 , further comprising:
a first adhesive layer disposed between the organic light-emitting panel and the low refractive index pattern layer; and
an anti-reflection film disposed on the high refractive index pattern layer.
15. The organic light-emitting display device of claim 14 , further comprising:
a circular polarization film disposed between the high refractive index pattern layer and the anti-reflection film, and comprising a phase shift layer and a linear polarization layer.
16. The organic light-emitting display device of claim 14 , further comprising:
a transmittance-adjusting layer disposed between the high refractive index pattern layer and the anti-reflection film.