Granted Patent B2

US 12,699,217 · App. 18/393,881 · Granted Aug 4, 2026

Inventors: Kuhyun Kang (Suwon-si, KR); Muhyun Kim (Seoul, KR); Geunwoo Yug (Seoul, KR); Seoin Han (Cheonan-si, KR)

Assignee: SAMSUNG DISPLAY CO., LTD.

G02B5/3033G02B5/3041G06F1/1641G06F1/1652G09F9/301G02F1/133305G02F1/133528H10K59/8791H10K2102/311

Abstract

Claims (30)

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.

Priority Claims (1)

Continuity (2)

References Cited (33)