Display device having folding area and polarization film with deformation portion
A polarization film includes: a base substrate in which a folding axis and a stretched axis are defined; and a deformation portion located at an edge of the base substrate. The stretched axis forms an angle of less than about 45° with respect to the folding axis. The display device, in which a folding area at which a folding axis is located and a non-folding area neighboring the folding area are defined, includes a display panel; a first adhesive layer on the display panel; and a polarization film on the first adhesive layer, where a stretched axis is defined in the polarization film. An angle between the folding axis and the stretched axis is less than about 45°.
1 . A display device comprising:
a display panel comprising: a folding area in which a folding axis is defined, and a non-folding area neighboring the folding area;
a first adhesive layer on the display panel; and
a polarization film on the first adhesive layer, wherein a stretched axis is defined in the polarization film,
wherein an angle between the folding axis and the stretched axis is less than about 45°,
wherein the polarization film comprises:
a base substrate in which the stretched axis is defined; and
a deformation portion located at an edge of the base substrate,
wherein the deformation portion has a greater width in the non-folding area than a width thereof in the folding area.
2 . The display device of claim 1 , wherein the stretched axis is parallel to the folding axis.
3 . The display device of claim 1 , wherein the polarization film comprises a base substrate including a linear polarization layer in which the stretched axis is defined, and a phase retardation layer on the linear polarization layer.
4 . The display device of claim 1 , wherein the folding axis forms an angle of less than about 135° with a light transmission axis of the linear polarization layer.
5 . The display device of claim 1 , wherein the polarization film is disposed on a triacetyl cellulose (TAC) film, the TAC film being attached to the phase retardation layer by a pressure sensitive adhesive (PSA).
6 . The display device of claim 1 , further comprising a hard-coating triacetyl cellulose (HC-TAC) film disposed on the base substrate of the polarization film, and a protective film disposed on the HC-TAC film.
7 . The display device of claim 1 , wherein at an edge of the base substrate of the folding area of the polarization film, only a thermally denatured portion and a color-shifting portion are present, and a recessed portion is absent.
8 . The display device of claim 1 , wherein the first adhesive layer includes a plurality of transparent silicon beads in the non-folding area, each bead having an outer diameter less than a thickness of the first adhesive layer and in a range from about 1% to about 95% of the thickness of the first adhesive layer.
9 . The display device of claim 1 , further comprising a window substrate including a first base film disposed on a second adhesive layer, with a third adhesive layer, a second base film, and a functional layer sequentially stacked on the first base film.
10 . The display device of claim 1 , wherein the phase retardation layer comprises a ½λ phase retardation layer and a ¼λ phase retardation layer.
11 . The display device of claim 10 , wherein an ultraviolet adhesive is disposed between the ½λ phase retardation layer and the ¼λ phase retardation layer.
12 . The display device of claim 1 ,
wherein the base substrate comprises:
a linear polarization layer in which the stretched axis is defined; and
a phase retardation layer on the linear polarization layer.
13 . The display device of claim 12 ,
wherein the deformation portion comprises
a first deformation portion extending in a direction perpendicular to the folding axis; and
a second deformation portion extending in a direction parallel to the folding axis.
14 . The display device of claim 13 , wherein the first deformation portion is not disposed at the folding area located at the edge of the base substrate.
15 . The display device of claim 13 , wherein the second deformation portion has a width greater than a width of the first deformation portion.
16 . The display device of claim 13 , wherein the second deformation portion has a plurality of recesses arranged at regular intervals.