Organic light emitting display device
Provided is an organic light emitting display device. The organic light emitting display device comprises a display panel; and an optical laminate disposed on the display panel and including a multi-functional layer. The multi-functional layer contains a liquid crystal mixture including a liquid crystal compound and two or more types of dichroic dyes, below the multi-functional layer, the liquid crystal compound is contained, but the two or more types of dichroic dyes are not included and above the multi-functional layer, the two or more types of dichroic layers are contained.
1 . An organic light emitting display device, comprising:
a display panel;
an optical laminate disposed on the display panel; and
a multi-functional layer within the optical laminate,
wherein:
the multi-functional layer contains a liquid crystal mixture including a liquid crystal compound and two or more types of dichroic dyes;
in a lower region of the multi-functional layer, the liquid crystal compound is present but the two or more types of dichroic dyes are not present;
in an upper region of the multi-functional layer, the two or more types of dichroic dyes are present;
the liquid crystal mixture is cured as a linear polarizer in the upper region of the multi-functional layer and is cured as a phase retarder in the lower region of the multi-functional layer;
the linear polarizer located on the upper region of the multi-functional layer and a phase retarder located on the lower region of the multi-functional layer are arranged continuously by phase separation of the liquid crystal mixture; and
an adhesive is not disposed between the linear polarizer and the phase retarder.
2 . The organic light emitting display device according to claim 1 , wherein a polarization axis of the linear polarizer has a difference of ±45 degrees with respect to the polarization axis of the phase retarder.
3 . The organic light emitting display device according to claim 1 , wherein the phase retarder is a λ/4 retarder.
4 . The organic light emitting display device according to claim 1 , wherein the linear polarizer includes the liquid crystal compound and the two or more types of dichroic dyes.
5 . The organic light emitting display device according to claim 1 , wherein the liquid crystal compound and the two or more types of dichroic dyes contained in the linear polarizer are aligned in the horizontal direction and the liquid crystal compound contained in the phase retarder is aligned to form a selected acute angle with the horizontal direction.
6 . The organic light emitting display device according to claim 1 , wherein the two or more types of dichroic dyes of the linear polarizer are configured with a higher density than the liquid crystal compound.
7 . The organic light emitting display device according to claim 1 , wherein the two or more types of dichroic dyes include a high alignment dichroic dye and a low alignment dichroic dye, and the high alignment dichroic dye has a concentration gradient in which a high concentration is present in a lower portion of the linear polarizer and the low alignment dichroic dye has a concentration gradient in which a high concentration is present in an upper portion of the linear polarizer.
8 . The organic light emitting display device according to claim 7 , wherein the high alignment dichroic dye has a higher density than the low alignment dichroic dye.
9 . The organic light emitting display device according to claim 7 , wherein the linear polarizer includes a first part in which the high alignment dichroic dye is contained with highest concentration and a second part in which the low alignment dichroic dye is contained with highest concentration and a boundary of the first part and the second part is a location in which the concentrations of the high alignment dichroic dye and the low alignment dichroic dye are equal.
10 . The organic light emitting display device according to claim 1 , wherein the liquid crystal compound and the dichroic dye contained in the linear polarizer are aligned by first linearly polarized ultraviolet (LPUV) light.
11 . The organic light emitting display device according to claim 10 , wherein the liquid crystal compound included in the phase retarder is aligned by second LPUV light.
12 . The organic light emitting display device according to claim 11 , wherein the first LPUV light is UV light which is linearly polarized at 0 degrees or 90 degrees and the second LPUV light is UV light which is linearly polarized at 45 degrees or 135 degrees.
13 . The organic light emitting display device according to claim 1 , wherein the multi-functional layer is formed by irradiating first linearly polarized ultraviolet (LPUV) light on one surface thereof and irradiating second LPUV light on another surface thereof and thermally curing by a baking process.
14 . The organic light emitting display device according to claim 13 , wherein on one surface on which the first LPUV light is irradiated, the liquid crystal compound and the two or more types of dichroic dyes are present and the liquid crystal compound and the two or more types of dichroic dyes are thermally cured to form the linear polarizer.
15 . The organic light emitting display device according to claim 14 , wherein the liquid crystal compound is present on the another surface on which the second LPUV light is irradiated and the liquid crystal compound is thermally cured to form a phase retarder.
16 . The organic light emitting display device according to claim 15 , wherein the linear polarizer and the phase retarder are cured together while preforming the baking process.