Display assembly and foldable display device
View Patent ↗A display assembly includes a display panel, a support plate disposed at a non-display surface of the display panel, and an adhesive layer for bonding the display panel and the support plate together. The display panel includes at least a bending area and non-bending areas disposed at two sides of the bending area. The support plate is disposed at the non-bending areas. The adhesive layer includes a first adhesive layer disposed at the non-bending areas and between the display panel and the support plate and a second adhesive layer disposed at the bending area and connected to the first adhesive layer. At least a portion of the bending area is not covered by the adhesive layer.
1. A display assembly, comprising:
a display panel;
a support plate disposed at a non-display surface of the display panel; and
an adhesive layer for bonding the display panel and the support plate together,
wherein:
the display panel includes at least a bending area and non-bending areas disposed at two sides of the bending area;
the support plate is disposed at the non-bending areas;
the adhesive layer includes a first adhesive layer disposed at the non-bending areas and between the display panel and the support plate and a second adhesive layer disposed at the bending area and connected to the first adhesive layer;
at least a portion of the bending area is not covered by the adhesive layer;
the display assembly includes an unfolded state and a folded state;
in the folded state, the bending area has a semicircular shape;
the display assembly includes a central axis in the bending area; and
a distance between an end surface of the second adhesive layer facing toward the central axis and the central axis is L0, wherein L0=(R−h)·π·0.5, 0<h<R, R is a radius of the semicircle shape formed in a folding area when the display panel is in the folded state, h is a distance between a neutral surface of the display panel and a surface of the support plate facing toward the display panel, and the neutral surface of the display panel is a virtual plane of the display panel that is neither under tension nor under press.
2. The display assembly according to claim 1 , wherein:
the non-bending area includes a first non-bending sub-area and a second non-bending sub-area adjacent to a same bending area
the bending area includes a first bending sub-area adjacent to the first non-bending sub-area and a second bending sub-area adjacent to the second non-bending sub-area;
the first bending sub-area and the second bending sub-area are separated by a first gap; and
the second adhesive layer is disposed at the first bending sub-area and the second bending sub-area.
3. The display assembly according to claim 2 , wherein:
in a direction along the non-bending area pointing toward the bending area, a width of the second adhesive layer disposed at the first bending sub-area is equal to a width of the second adhesive layer disposed at the second bending sub-area.
4. The display assembly according to claim 2 , wherein:
a thickness of the second adhesive layer disposed at the first bending sub-area is equal to a thickness of the second adhesive layer disposed at the second bending sub-area.
5. The display assembly according to claim 1 , wherein:
a thickness of the display panel is H, and h<H.
6. The display assembly according to claim 1 , wherein:
a thickness of the first adhesive layer is equal to a thickness of the second adhesive layer.
7. The display assembly according to claim 1 , wherein:
the first adhesive layer and the second adhesive layer are formed into a single piece.
8. The display assembly according to claim 1 , wherein:
a cover film is disposed in the bending area at a surface of the second adhesive layer facing away from the display panel.
9. The display assembly according to claim 8 , wherein:
the support plate extends into the bending area and is multiplexed as the cover film.
10. The display assembly according to claim 1 , wherein:
the display panel includes a substrate made of polyimide or stainless steel.
11. The display assembly according to claim 1 , wherein:
the display panel includes an organic electroluminescence light-emitting display panel, an electronic paper, or an inorganic light-emitting diode display panel.
12. A foldable display device comprising a display assembly, wherein the display assembly includes:
a display panel;
a support plate disposed at a non-display surface of the display panel; and
an adhesive layer for bonding the display panel and the support plate together,
wherein:
the display panel includes at least a bending area and non-bending areas disposed at two sides of the bending area;
the support plate is disposed at the non-bending areas;
the adhesive layer includes a first adhesive layer disposed at the non-bending areas and between the display panel and the support plate and a second adhesive layer disposed at the bending area and connected to the first adhesive layer;
at least a portion of the bending area is not covered by the adhesive layer;
the display assembly includes an unfolded state and a folded state;
in the folded state, the bending area has a semicircular shape;
the display assembly includes a central axis in the bending area; and
a distance between an end surface of the second adhesive layer facing toward the central axis and the central axis is L0, wherein L0=(R−h)·π·0.5, 0<h<R, R is a radius of the semicircle shape formed in a folding area when the display panel is in the folded state, h is a distance between a neutral surface of the display panel and a surface of the support plate facing toward the display panel, and the neutral surface of the display panel is a virtual plane of the display panel that is neither under tension nor under press.
13. The foldable display device according to claim 12 , wherein:
the non-bending area includes a first non-bending sub-area and a second non-bending sub-area adjacent to a same bending area;
the bending area includes a first bending sub-area adjacent to the first non-bending sub-area and a second bending sub-area adjacent to the second non-bending sub-area;
the first bending sub-area and the second bending sub-area are separated by a first gap; and
the second adhesive layer is disposed at the first bending sub-area and the second bending sub-area.
14. The foldable display device according to claim 13 , wherein:
in a direction along the non-bending area pointing toward the bending area, a width of the second adhesive layer disposed at the first bending sub-area is equal to a width of the second adhesive layer disposed at the second bending sub-area.
15. The foldable display device according to claim 13 , wherein:
a thickness of the second adhesive layer disposed at the first bending sub-area is equal to a thickness of the second adhesive layer disposed at the second bending sub-area.
16. The foldable display device according to claim 12 , wherein:
a thickness of the display panel is H, and h<H.