Foldable display
A foldable display, includes a display layer with flexibility including a first display region, a second display region, and a third display region located between the first display region and the second display region; a cover with flexibility configured to cover the display layer; a first support substrate with inflexibility configured to support the first display region; a second support substrate with inflexibility configured to support the second display region; a bending part capable of bending including the third display region; and a shock absorbing layer provided between the display layer and the first support substrate and between the display layer and the second support substrate.
1. A foldable display, comprising:
a display layer with flexibility including a first display region, a second display region, and a third display region located between the first display region and the second display region;
a cover with flexibility configured to cover the display layer;
a first support substrate with inflexibility configured to support the first display region;
a second support substrate with inflexibility configured to support the second display region;
a bending part capable of bending including the third display region; and
a shock absorbing layer provided between the display layer and the first support substrate and between the display layer and the second support substrate,
wherein the shock absorbing layer includes
a first plastic film,
a second plastic film provided on an opposite side to the display layer as seen from the first plastic film, and
a metal film provided between the first plastic film and the second plastic film.
2. The foldable display according to claim 1 ,
wherein a second moment of area of a part of the metal film that overlaps the bending part is less than a second moment of area of a part of the metal film that overlaps the first support substrate and is less than a second moment of area of a part of the metal film that overlaps the second support substrate.
3. The foldable display according to claim 2 ,
wherein in a plan view of the foldable display, the part of the metal film that overlaps the bending part has a grating-like shape, a lattice shape, or a chain-like shape.
4. The foldable display according to claim 3 ,
wherein in a plan view of the foldable display, the metal film in entirety has a grating-like shape, a lattice shape, or a chain-like shape.
5. The foldable display according to claim 1 ,
wherein the shock absorbing layer includes an adhesive layer provided at least one of between the first plastic film and the metal film or between the second plastic film and the metal film.
6. The foldable display according to claim 5 ,
wherein an air layer is formed inside the adhesive layer.
7. The foldable display according to claim 5 ,
wherein at least the adhesive layer is separated into a plurality located on either side of the bending part.
8. The foldable display according to claim 5 ,
wherein the adhesive layer includes a first adhesive layer provided between the first plastic film and the metal film and a second adhesive layer provided between the second plastic film and the metal film,
a storage modulus of the first adhesive layer is from 0.2 MPa to 4.5 MPa,
a loss modulus of the first adhesive layer is from 0.2 MPa to 4.5 MPa, and
a thickness of the first adhesive layer is from 1 μm to 10 μm.
9. The foldable display according to claim 5 ,
wherein the adhesive layer includes a first adhesive layer provided between the first plastic film and the metal film and a second adhesive layer provided between the second plastic film and the metal film,
a storage modulus of the second adhesive layer is from 0.04 MPa to 0.8 MPa, and
a loss modulus of the second adhesive layer is from 0.03 MPa to 0.5 MPa.
10. The foldable display according to claim 5 ,
wherein the adhesive layer includes a first adhesive layer provided between the first plastic film and the metal film and a second adhesive layer provided between the second plastic film and the metal film, and
a Vickers hardness of the metal film is 500 HV or greater.
11. The foldable display according to claim 1 ,
wherein the metal film includes at least one of stainless steel, aluminum, or copper.
12. The foldable display according to claim 1 ,
wherein a thickness of the metal film is from 10 μm to 100 μm.
13. The foldable display according to claim 1 ,
wherein the first plastic film includes at least one of polyimide, PET, PEN, COC, or aramid.
14. The foldable display according to claim 1 ,
wherein the second plastic film includes at least one of PET, urethane resin, polyester resin, acrylic resin, or polycarbonate resin.
15. The foldable display according to claim 1 ,
wherein a Young's modulus of the first plastic film is greater than a Young's modulus of the second plastic film.
16. The foldable display according to claim 1 ,
wherein a thickness of the first plastic film is greater than a thickness of the metal film, and
a thickness of the second plastic film is equal to or greater than a thickness of the first plastic film.
17. The foldable display according to claim 1 ,
wherein the second plastic film is a layered structure including a plurality of layers made of different materials.
18. The foldable display according to claim 1 ,
wherein a Young's modulus of the first plastic film is from 1 GPa to 10 GPa.
19. The foldable display according to claim 1 , further comprising:
a thermal diffusion function layer provided on the second plastic film side as seen from the metal film.
20. The foldable display according to claim 1 , further comprising:
a touch panel provided between the display layer and the cover.