Foldable display device
A foldable display device is disclosed. The foldable display device includes a display panel including a folding area and a non-folding area, a back plate unit, and a plurality of adhesive layers disposed between the display panel and the back plate unit and between the back plate units. Some of the plurality of adhesive layers includes a first adhesive part and a second adhesive part having different adhesiveness. Therefore, an adhesiveness of the plurality of adhesive layers is controlled to reduce the stress generated at the time of folding the foldable display device.
1. A foldable display device, comprising:
a display panel including a folding area and a non-folding area, the display panel configured to fold in the folding area and not configured to fold in the non-folding area;
a back plate unit comprising a plurality of back plates, the back plate unit disposed under the display panel; and
a plurality of adhesive layers disposed between the display panel and the back plate unit, and between the plurality of back plates,
wherein at least some of the plurality of adhesive layers includes a first adhesive part and a second adhesive part, the second adhesive part less adhesive than the first adhesive part.
2. The foldable display device according to claim 1 , wherein the first adhesive part overlaps the folding area and the non-folding area, and the second adhesive part overlaps the non-folding area without overlapping the folding area.
3. The foldable display device according to claim 2 , wherein the first adhesive part overlaps the folding area and a part of the non-folding area that is adjacent to the folding area.
4. The foldable display device according to claim 1 , wherein the display panel includes an active area that display an image and a non-active area that does not display the image, the non-active area surrounding the active area; and
wherein the second adhesive part overlaps a first portion of the non-active area that is adjacent to a first end of the active area and a second portion of the non-active area that is adjacent to a second end of the active area that is opposite the first end of the active area.
5. The foldable display device according to claim 4 , wherein the second adhesive part further overlaps at least a portion of the active area that extends from the non-active area.
6. The foldable display device according to claim 1 , wherein the second adhesive part includes an edge pattern having a first side and a second side that is longer than the first side, the second side parallel to a folding axis of the folding area.
7. The foldable display device according to claim 6 , wherein an adhesiveness of the edge pattern reduces as a distance between the edge pattern to the folding area increases; and
wherein an adhesiveness of a third side of the edge pattern that is parallel to the second side is greater than an adhesiveness of the second side of the edge pattern, the third side closer to the folding area than the second side.
8. The foldable display device according to claim 1 , wherein the second adhesive part includes a plurality of line patterns, each of the plurality of line patterns spaced apart from another one of the plurality of line patterns; and
wherein each of the plurality of line patterns includes a first side and a second side that is longer than the first side, the second side of each of the plurality of line patterns parallel to a folding axis of the folding area.
9. The foldable display device according to claim 1 , wherein the second adhesive part includes a plurality of dot patterns, each of the plurality of dot patterns spaced apart from another one of the plurality of dot patterns.
10. The foldable display device according to claim 1 , further comprising:
a frame disposed below the back plate unit, the frame including a plurality of openings that overlap the folding area without overlapping the non-folding area.
11. The foldable display device according to claim 10 , wherein the plurality of adhesive layers includes an adhesive layer disposed between the back plate unit and the frame, the adhesive layer between the back plate unit and the frame including the first adhesive part and the second adhesive part.
12. The foldable display device according to claim 1 , wherein the plurality of back plates include include a first back plate and a second back plate having different Young's moduli,
wherein an adhesive layer from the plurality of adhesive layers is disposed between the first back plate and the second back plate, the adhesive layer between the first back plate and the second back plate including the first adhesive part and the second adhesive part.
13. The foldable display device according to claim 1 , wherein edges of the display panel and the plurality of back plates are not aligned while the foldable display device is folded, and the edges of the display panel and the plurality of back plates are aligned while the foldable display device is not folded.
14. The foldable display device according to claim 13 , wherein an edge of the back plate unit is more inset than an edge of the display panel while the foldable display device is in-folded, and
wherein the edge of the display panel is more inset than the edge of the back plate unit while the foldable display device is out-folded.
15. A foldable display device, comprising:
a display panel configured to be folded with respect to a folding axis;
a back plate unit disposed on the display panel, the back plate unit comprising a plurality of back plates;
a frame disposed on the back plate unit; and
a plurality of adhesive layers disposed between the display panel and the back plate unit, between the plurality of back plates, and between the back plate unit and the frame,
wherein an adhesiveness at an edge portion of the plurality of adhesive layers is less adhesive than an adhesiveness of a portion of the plurality of adhesive layers at the folding axis.
16. The foldable display device according to claim 15 , wherein a cross-linking density of the portion at the folding axis is different from a cross-linking density of the edge portion.
17. The foldable display device according to claim 15 , wherein the display panel is configured by a visible area that display an image and a non-visible area that does not display the image,
wherein the folding axis overlaps the visible area and the edge portion overlaps the non-visible area.
18. A foldable display device, comprising:
a display panel including a folding area and a non-folding area, the display panel configured to fold in the folding area and not configured to fold in the non-folding area;
a back plate unit below the display panel; and
one or more adhesive layers disposed between the display panel and the back plate unit,
wherein at least some of the one or more adhesive layers include a first adhesive part and a second adhesive part, the second adhesive part less adhesive than the first adhesive part.
19. The foldable display device according to claim 18 , wherein the first adhesive part at least overlaps the folding area, and the second adhesive part overlaps the non-folding area without overlapping the folding area.
20. The foldable display device according to claim 18 , wherein edges of the display panel and the back plate are not aligned while the foldable display device is folded, and the edges of the display panel and the back plate are aligned while the foldable display device is not folded.