CN214476052U - Curved surface display device - Google Patents
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- CN214476052U CN214476052U CN202022659635.6U CN202022659635U CN214476052U CN 214476052 U CN214476052 U CN 214476052U CN 202022659635 U CN202022659635 U CN 202022659635U CN 214476052 U CN214476052 U CN 214476052U
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Abstract
A curved display device is provided, which includes one or more bending portions where the curved display device is bent. At least one or more of the bending portions of the curved display device include a stacked structure, the stacked structure including: a support layer; a display panel on the support layer; and N pressure sensitive adhesive layers and M flexible base layers between the support layer and the display panel, N being an integer of 3 or more and M being an integer of 2 or more. A first one of the N pressure sensitive adhesive layers bonds the support layer and a first one of the M flexible base layers together. The last of the N pressure sensitive adhesive layers bonds the display panel and the last of the M flexible base layers together.
Description
Technical Field
The utility model relates to a display technology, more specifically relates to a curved surface display device.
Background
Conventional display devices are typically flat panel display devices. In recent years, display devices having a curved display surface have been proposed for design or other reasons. Curved display apparatuses have been applied to computer monitors, televisions, personal portable devices, and display screens installed in vehicles.
SUMMERY OF THE UTILITY MODEL
In one aspect, the present disclosure provides a curved display device comprising one or more bends at which the curved display device is bent; wherein at least the one or more bending portions of the curved display device comprise a stacked structure, the stacked structure comprising: a support layer; a display panel on the support layer; and N pressure sensitive adhesive layers and M flexible base layers between the support layer and the display panel, N being an integer of 3 or more and M being an integer of 2 or more; wherein the N pressure sensitive adhesive layers and the M flexible base layers are alternately arranged; a first one of the N pressure sensitive adhesive layers bonding the support layer and the first one of the M flexible base layers together; the last of the N pressure sensitive adhesive layers bonds the display panel and the last of the M flexible base layers together; each of the N pressure-sensitive adhesive layers has a thickness in a range of 30 to 55 μm; each of the M flexible base layers has a thickness in a range of 20 μ M to 40 μ M; and a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 0.75 to 2.75.
Optionally, a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 1.5 to 1.375.
Optionally, the curved display device further comprises a substantially flat portion connected to the one or more bends; wherein the stacked structure is a structure extending over the substantially flat portion and the one or more bends; the stacked structure is bent in the one or more bends; and the N pressure sensitive adhesive layers and the M flexible base layers extend across the substantially flat portion and the one or more folds.
Optionally, the support layer is a metal support layer.
Optionally, the stacked structure further comprises: the polaroid is positioned on one side of the display panel, which is far away from the supporting layer; an optically transparent adhesive layer on a side of the polarizer remote from the display panel; and the cover is positioned on one side of the optical transparent adhesive layer far away from the polaroid.
Optionally, each of the N pressure sensitive adhesive layers comprises an acrylic-based adhesive material; and each of the M flexible base layers comprises an organic material.
Optionally, an nth one of the N pressure sensitive adhesive layers is adhered to two adjacent ones of the M flexible base layers, wherein 1< N; and the mth one of the M flexible base layers is adhered to two adjacent ones of the N pressure-sensitive adhesive layers, wherein M is 1. ltoreq. M.
In another aspect, the present disclosure provides a method of manufacturing a curved display device, including: setting a display panel; arranging a supporting layer; bonding the display panel and the support layer using N pressure sensitive adhesive layers and M flexible base layers, N being an integer of 3 or more and M being an integer of 2 or more; and bending an assembly comprising the display panel, the support layer, the N pressure sensitive adhesive layers, and the M flexible base layers, thereby forming one or more bends in the assembly; wherein bonding the display panel and the support layer comprises: bonding a first one of the N pressure sensitive adhesive layers to a surface of the support layer, thereby bonding the support layer and the first one of the M flexible base layers together; and bonding a display panel to a last of the N pressure sensitive adhesive layers, thereby bonding the display panel and a last of the M flexible base layers together; wherein at least the one or more folds are formed to include a stacked structure including, in order, the support layer, the N pressure-sensitive adhesive layers and the M flexible base layers, and the display panel; the N pressure sensitive adhesive layers and the M flexible base layers are alternately arranged; each of the N pressure-sensitive adhesive layers has a thickness in a range of 30 to 55 μm; each of the M flexible base layers has a thickness in a range of 20 μ M to 40 μ M; and a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 0.75 to 2.75.
Optionally, a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 1.5 to 1.375.
Optionally, bending the component also forms a substantially flat portion connected to the one or more bends; wherein the stacked structure is a structure extending over the substantially flat portion and the one or more bends; the stacked structure is bent in the one or more bends; and the N pressure sensitive adhesive layers and the M flexible base layers extend across the substantially flat portion and the one or more folds.
Optionally, the method further comprises: forming a polarizer on one side of the display panel far away from the supporting layer; forming an optically transparent adhesive layer on one side of the polarizer far away from the display panel; and forming a cover on the side of the optically transparent adhesive layer away from the polarizer.
Optionally, the method further comprises forming an adhesive module by forming a stacked structure including the N pressure-sensitive adhesive layers and the M flexible base layers, first protective films, and second protective films alternately stacked together.
Optionally, the method further comprises forming an adhesive support module; wherein forming the adhesive support module comprises: removing the first protective film from the adhesive module; and adhering the support layer to the first of the N pressure sensitive adhesive layers, the first of the N pressure sensitive adhesive layers being adhered to a surface of the support layer.
Optionally, the method further comprises: removing the second protective film from the adhesive module; and adhering the display panel to the last of the N pressure sensitive adhesive layers.
Drawings
In accordance with various disclosed embodiments, the following drawings are merely examples for illustrative purposes and are not intended to limit the scope of the present disclosure.
Fig. 1A is a perspective view of a curved display device in some embodiments according to the present disclosure.
Fig. 1B is a sectional view taken along a line a-a' in the curved display device of fig. 1A.
Fig. 2A is an enlarged cross-sectional view of a first enlarged region in fig. 1B.
Fig. 2B is an enlarged cross-sectional view of a second enlarged region in fig. 1B.
Fig. 2C is a stacked structure in a curved display device in some embodiments according to the present disclosure.
Fig. 3A is a schematic diagram illustrating an adhesive module in some embodiments according to the present disclosure.
Fig. 3B is a schematic diagram illustrating an adhesive module in some embodiments according to the present disclosure.
Fig. 3C is a schematic diagram illustrating an adhesive support module in some embodiments according to the present disclosure.
Fig. 4A-4C illustrate methods of manufacturing curved display devices in some embodiments according to the present disclosure.
Detailed Description
The present disclosure will now be described more specifically with reference to the following examples. It should be noted that the following description of some embodiments presented herein is for the purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.
The present disclosure provides, among other things, a curved display device and a method of manufacturing a curved display device that substantially obviate one or more problems due to limitations and disadvantages of the related art. In one aspect, the present disclosure provides a curved surface display device. In some embodiments, a curved display device includes one or more bends at which the curved display device is bent. In some embodiments, at least the one or more bending portions of the curved display device comprise a stacked structure comprising: a support layer; a display panel on the support layer; and N pressure sensitive adhesive layers and M flexible base layers between the support layer and the display panel, N being an integer of 3 or more and M being an integer of 2 or more. Optionally, the N pressure sensitive adhesive layers and the M flexible base layers are alternately arranged. Optionally, a first one of the N pressure sensitive adhesive layers bonds the support layer and a first one of the M flexible base layers together. Optionally, a last of the N pressure sensitive adhesive layers bonds the display panel and a last of the M flexible base layers together. Optionally, each of the N pressure sensitive adhesive layers has a thickness in a range of 30 μm to 55 μm. Optionally, a thickness of each of the M flexible base layers is in a range of 20 μ ι η to 40 μ ι η. Optionally, a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 0.75 to 2.75.
Fig. 1A is a perspective view of a curved display device in some embodiments according to the present disclosure. Referring to fig. 1A, in some embodiments, a curved display device includes one or more bending portions BP in which the curved display device is bent. In one example, the curved display device further includes a substantially flat portion SFP connected to the one or more bend portions BP.
Fig. 1B is a sectional view taken along a line a-a' in the curved display device of fig. 1A. Fig. 2A is an enlarged cross-sectional view of a first enlarged region in fig. 1B. Referring to fig. 1B and 2A, in some embodiments, the substantially planar portion SFP includes a stacked structure. In some embodiments, the stacked structure includes a support layer SUS, a display panel DP on the support layer SUS, and N pressure sensitive adhesive layers (PSA1, …, PSAN) and M flexible base layers (BL1, …, BLM) between the support layer and the display panel, N being an integer of 3 or more and M being an integer of 2 or more. As shown in fig. 1B and 2A, N pressure-sensitive adhesive layers and M flexible base layers are alternately arranged. The first layer (PSA1) of the N pressure-sensitive adhesive layers adheres the support layer SUS and the first layer (BL1) of the M flexible base layers together. The last of the N pressure sensitive adhesive layers (PSAN) bonds the display panel DP and the last of the M flexible base layers together. The stacked structure in the substantially flat portion SFP is substantially flat.
Fig. 2B is an enlarged cross-sectional view of a second enlarged region in fig. 1B. Referring to fig. 2B and 2A, in some embodiments, each of the one or more bent portions BP includes a stacked structure. In some embodiments, the stacked structure includes a support layer SUS, a display panel DP on the support layer SUS, and N pressure sensitive adhesive layers (PSA1, …, PSAN) and M flexible base layers (BL1, …, BLM) between the support layer and the display panel, N being an integer of 3 or more and M being an integer of 2 or more. As shown in fig. 1B and 2A, N pressure-sensitive adhesive layers and M flexible base layers are alternately arranged. The first layer (PSA1) of the N pressure-sensitive adhesive layers adheres the support layer SUS and the first layer (BL1) of the M flexible base layers together. The last of the N pressure sensitive adhesive layers (PSAN) bonds the display panel DP and the last of the M flexible base layers together. The stack is folded in one or more folds BP.
As shown in fig. 1B, 2A, and 2B, in some embodiments, the stacked structure is a structure extending over the substantially flat portion SFP and the one or more bends BP. As shown in fig. 1B, 2A, and 2B, the N pressure-sensitive adhesive layers and the M flexible base layers extend over the substantially flat portion SFP and the one or more bent portions BP. Optionally, the support layer SUS extends over the entire substantially flat portion SFP and the one or more bends BP. Optionally, the display panel extends over the entire substantially flat portion SFP and the one or more bending portions BP.
Fig. 2C is a stacked structure in a curved display device in some embodiments according to the present disclosure. Referring to fig. 2C, in some embodiments, N is 3 and M is 2. The stacked structure includes a support layer SUS, a first pressure sensitive adhesive layer PSA1 on the support layer SUS, a first flexible base layer BL1 on a side of the first pressure sensitive adhesive layer PSA1 away from the support layer SUS, a second pressure sensitive adhesive layer PSA2 on a side of the first flexible base layer BL1 away from the first pressure sensitive adhesive layer PSA1, a second flexible base layer BL2 on a side of the second pressure sensitive adhesive layer PSA2 away from the first flexible base layer BL1, a third pressure sensitive adhesive layer PSA3 on a side of the second flexible base layer BL2 away from the second pressure sensitive adhesive layer PSA2, and a display panel DP on a side of the third pressure sensitive adhesive layer PSA3 away from the second flexible base layer BL 2.
In some embodiments, the nth of the N pressure sensitive adhesive layers is adhered to two adjacent of the M flexible base layers, wherein 1< N.
In some embodiments, the mth one of the M flexible base layers is adhered to two adjacent ones of the N pressure sensitive adhesive layers, wherein 1 ≦ M ≦ M.
The utility model discloses a surprised and unexpected discovery of the utility model discloses a stacked structure of having N pressure sensitive adhesive layer and M flexible basic unit of arranging alternately between display panel DP and support layer SUS obtains the excellent bonding characteristic that bonds display panel DP and support layer SUS together. Compared to single layer adhesives that are generally prone to cracking after 24 hours under bending strain and stress when the display panel DP and the support layer SUS are bent, the structure of the present invention is very resistant to cracking or other damage when the display panel DP and the support layer SUS are bent. In particular, the stacked structure is substantially crack-free for months or more when the thickness of the pressure sensitive adhesive layer and the flexible base layer are within certain selected ranges.
In some embodiments, each of the N pressure sensitive adhesive layers has a thickness in a range of 30 μ ι η to 55 μ ι η; each of the M flexible base layers has a thickness in a range of 20 μ M to 40 μ M; and a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 0.75 to 2.75. Optionally, each of the N pressure sensitive adhesive layers has a thickness in a range of 30 μ ι η to 35 μ ι η, 35 μ ι η to 40 μ ι η, 40 μ ι η to 45 μ ι η, 45 μ ι η to 50 μ ι η, or 50 μ ι η to 55 μ ι η. Optionally, a thickness of each of the M flexible base layers is in a range of 20 μ ι η to 25 μ ι η, 25 μ ι η to 30 μ ι η, 30 μ ι η to 35 μ ι η, or 35 μ ι η to 40 μ ι η. Optionally, a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 0.75 to 1.0, 1.0 to 1.25, 1.25 to 1.50, 1.50 to 1.75, 1.75 to 2.0, 2.0 to 2.25, 2.25 to 2.5, or 2.5 to 2.75. The utility model of the present disclosure has found that curved display devices are unexpectedly resistant to cracking and other damage associated with bending strains and stresses when the thickness of the pressure sensitive adhesive layer and flexible base layer are within these selected ranges.
Various suitable materials and various suitable manufacturing methods may be used to manufacture the pressure sensitive adhesive layer. For example, a pressure-sensitive adhesive material may be used to form the pressure-sensitive adhesive layer. Examples of suitable pressure sensitive adhesive materials include, but are not limited to, acrylic-based adhesive materials such as homopolymers and copolymers of acrylic acid, methacrylic acid, isooctyl acrylate, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, methyl isoamyl acrylate, octyl 2-acrylate, and butyl acrylate. Optionally, the pressure sensitive adhesive layer is an optically clear adhesive layer. Optionally, the pressure sensitive adhesive layer is a heat sensitive adhesive layer.
Various suitable materials and various suitable manufacturing methods may be used to manufacture the flexible substrate. Examples of suitable flexible materials include, but are not limited to, various polymers such as polyimides, polycarbonates, polyethersulfones, polyethylene terephthalate, polyethylene naphthalate, polyarylates, and fiber reinforced plastics. Optionally, the flexible base layer comprises a foam material.
Various suitable materials and various suitable manufacturing methods may be used for manufacturing the support layer SUS. Alternatively, the support layer SUS includes an organic material layer. In one example, an organic polymer material may be used to form the organic material layer (e.g., foam layer). Examples of suitable organic polymeric materials include, but are not limited to, polyethylene terephthalate. Optionally, the support layer SUS includes a metal support layer. Various suitable materials and various suitable manufacturing methods may be used to manufacture the metallic support layer. For example, a metallic material may be used to form the metallic support layer. Examples of suitable metallic materials include, but are not limited to, aluminum and copper, as well as various suitable alloys or laminates.
Referring to fig. 1B, in some embodiments, the curved display device further includes a polarizer PL positioned at a side of the display panel DP away from the support layer SUS; an optically transparent adhesive layer OCA on a side of the polarizer PL remote from the display panel DP; and a cover CG positioned on a side of the optically clear adhesive layer OCA remote from the polarizer PL. Optionally, the cover CG is a flexible cover glass. Optionally, the cover CG is a flexible cover membrane.
Various suitable materials and various suitable manufacturing methods may be used to manufacture the optically clear adhesive layer OCA. Examples of suitable optically clear adhesive materials include, but are not limited to, polyacrylic acids, such as Polymethylmethacrylate (PMMA); a cyclic olefin copolymer; a polycarbonate; an epoxy resin; a silicone-based optically clear adhesive material; or a combination thereof.
Various suitable materials and various suitable manufacturing methods may be used to manufacture the cover CG. Examples of suitable materials for making the cover CG include, but are not limited to, polyamines, such as colorless polyamines, thin glasses, ultra-thin glasses, polyethylene terephthalate, polyacrylates, polymethyl methacrylate, polycarbonate, polyethylene naphthalate, polyvinylidene chloride, polyvinylidene fluoride, polystyrene, ethylene vinyl alcohol copolymers, and/or combinations thereof. Optionally, the cap CG has a double-layer structure including a first sublayer, a second sublayer, and an adhesive sublayer bonding the first sublayer and the second sublayer together. Optionally, the first and second sub-layers are made of a colorless polyamine, and the adhesive sub-layer is an optically clear adhesive sub-layer. Optionally, the cap CG further comprises a hard coating sublayer. Optionally, the cover CG further includes a protective film.
Alternatively, the thickness of the support layer SUS is in the range of 50 μm to 200 μm, for example, 50 μm to 60 μm, 60 μm to 70 μm, 70 μm to 80 μm, 80 μm to 90 μm, 90 μm to 100 μm, 100 μm to 110 μm, 110 μm to 120 μm, 120 μm to 130 μm, 130 μm to 140 μm, 140 μm to 150 μm, 150 μm to 160 μm, 160 μm to 170 μm, 170 μm to 180 μm, 180 μm to 190 μm, or 190 μm to 200 μm. Alternatively, the thickness of the support layer SUS is 100 μm.
Optionally, a total thickness of the N pressure sensitive adhesive layers and the M flexible base layers is in a range of 60 μ ι η to 260 μ ι η, e.g., 60 μ ι η to 70 μ ι η, 70 μ ι η to 80 μ ι η, 80 μ ι η to 90 μ ι η, 90 μ ι η to 100 μ ι η, 100 μ ι η to 110 μ ι η, 110 μ ι η to 120 μ ι η, 120 μ ι η to 130 μ ι η, 130 μ ι η to 140 μ ι η, 140 μ ι η to 150 μ ι η, 150 μ ι η to 160 μ ι η, 160 μ ι η to 170 μ ι η, 170 μ ι η to 180 μ ι η, 180 μ ι η to 190 μ ι η, 190 μ ι η to 200 μ ι η, 200 μ ι η to 210 μ ι η, 210 μ ι η to 220 μ ι η, 220 μ ι η to 230 μ ι η, 230 μ ι η to 240 μ ι η, 240 μ ι η to 250 μ ι η, or 250 μ ι η to 260 μ ι η. Optionally, the total thickness of the N pressure sensitive adhesive layers and the M flexible base layers is 130 μ M.
Optionally, the thickness of the display panel DP is in the range of 20 μm to 80 μm, such as 20 μm to 30 μm, 30 μm to 40 μm, 40 μm to 50 μm, 50 μm to 60 μm, 60 μm to 70 μm or 70 μm to 80 μm. Optionally, the thickness of the display panel DP is 38 μm.
Alternatively, the thickness of the polarizer PL is in the range of 35 μm to 130 μm, for example, 35 μm to 40 μm, 40 μm to 50 μm, 50 μm to 60 μm, 60 μm to 70 μm, 70 μm to 80 μm, 90 μm to 100 μm, 100 μm to 110 μm, 110 μm to 120 μm, or 120 μm to 130 μm. Alternatively, the thickness of the polarizer PL was 67 μm.
Optionally, the optically clear adhesive layer OCA has a thickness in a range from 25 μm to 100 μm, such as from 25 μm to 30 μm, from 30 μm to 40 μm, from 40 μm to 50 μm, from 50 μm to 60 μm, from 60 μm to 70 μm, from 70 μm to 80 μm, from 80 μm to 90 μm, or from 90 μm to 100 μm. Optionally, the optically clear adhesive layer OCA has a thickness of 50 μm.
Optionally, the thickness of the cap CG is in a range of 45 μm to 180 μm, e.g., 45 μm to 50 μm, 50 μm to 60 μm, 60 μm to 70 μm, 70 μm to 80 μm, 90 μm to 100 μm, 100 μm to 110 μm, 110 μm to 120 μm, 120 μm to 130 μm, 130 μm to 140 μm, 140 μm to 150 μm, 150 μm to 160 μm, 160 μm to 170 μm, or 170 μm to 180 μm. Optionally, the thickness of the cover CG is 90 μm.
In another aspect, the present disclosure provides a method of manufacturing a curved display device. In some embodiments, the method comprises: setting a display panel; arranging a supporting layer; bonding the display panel and the support layer using N pressure sensitive adhesive layers and M flexible base layers, N being an integer of 3 or more and M being an integer of 2 or more; and bending an assembly including the display panel, the support layer, the N pressure sensitive adhesive layers, and the M flexible base layers, thereby forming one or more bent portions in the assembly. Optionally, bonding the display panel and the support layer comprises: bonding a first one of the N pressure sensitive adhesive layers to a surface of the support layer, thereby bonding the support layer and the first one of the M flexible base layers together; and bonding a display panel to the last of the N pressure sensitive adhesive layers, thereby bonding the display panel and the last of the M flexible base layers together. Optionally, at least the one or more folds are formed to include a stacked structure including, in order, the support layer, the N pressure-sensitive adhesive layers and the M flexible base layers, and the display panel. Optionally, the N pressure sensitive adhesive layers and the M flexible base layers are alternately arranged. Optionally, each of the N pressure sensitive adhesive layers has a thickness in a range of 30 μm to 55 μm. Optionally, a thickness of each of the M flexible base layers is in a range of 20 μ ι η to 40 μ ι η. Optionally, a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 0.75 to 2.75. Optionally, a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 1.5 to 1.375.
In some embodiments, bending the component also forms a substantially flat portion connected to the one or more bends. Optionally, the stacked structure is a structure extending over the substantially flat portion and the one or more bends. Optionally, the stacked structure is folded in the one or more folds. Optionally, the N pressure sensitive adhesive layers and the M flexible base layers extend across the substantially flat portion and the one or more folds.
In some embodiments, the method further comprises: forming a polarizer on one side of the display panel far away from the supporting layer; forming an optically transparent adhesive layer on one side of the polarizer far away from the display panel; and forming a cover on the side of the optically transparent adhesive layer away from the polarizer.
In some embodiments, the method further comprises forming an adhesive module. Fig. 3A is a diagram illustrating an adhesive module in some embodiments according to the present disclosure. Referring to fig. 3A, in some embodiments, forming an adhesive module includes forming a stacked structure including N pressure sensitive adhesive layers (PSA1, …, PSAN) and M flexible base layers (BL1, …, BLM), a first protective film PF1 and a second protective film PF2, which are alternately stacked together. An nth one of the N pressure sensitive adhesive layers is adhered to two adjacent ones of the M flexible base layers, wherein 1< N < N. An mth one of the M flexible base layers is adhered to two adjacent ones of the N pressure sensitive adhesive layers, wherein M is 1. ltoreq. M. A first of the N pressure sensitive adhesive layers bonds the first protective film PF1 and a first of the M flexible base layers together. The last of the N pressure sensitive adhesive layers adhered the second protective film PF2 and the last of the M flexible base layers together. Fig. 3B is a diagram illustrating an adhesive module in some embodiments according to the present disclosure. Fig. 3B shows an embodiment where N-3 and M-2.
Various suitable materials and various suitable manufacturing methods may be used to manufacture the protective film. Examples of suitable protective film materials include, but are not limited to, various polymers such as polyethylene terephthalate, plastics, and fiber-containing materials.
The layers of the adhesive module may be assembled together using a variety of suitable methods (e.g., coating and roll-to-roll processing). In a roll-to-roll process, a first flexible material (e.g., a pressure sensitive adhesive layer or a flexible base layer) is continuously dispensed from a first roll, optionally processed, and rewound onto a second roll where it is bonded or laminated to a second flexible material (e.g., another flexible base layer or another pressure sensitive adhesive layer).
In the adhesive module of the present invention, each of the N pressure-sensitive adhesive layers has a thickness in a range of 30 to 55 μm; each of the M flexible base layers has a thickness in a range of 20 μ M to 40 μ M; and a thickness ratio of a respective one of the N pressure sensitive adhesive layers to a respective one of the M flexible base layers is in a range of 0.75 to 2.75. Optionally, each of the N pressure sensitive adhesive layers has a thickness in a range of 30 μ ι η to 35 μ ι η, 35 μ ι η to 40 μ ι η, 40 μ ι η to 45 μ ι η, 45 μ ι η to 50 μ ι η, or 50 μ ι η to 55 μ ι η. Optionally, each of the M flexible base layers has a thickness in a range from 20 μ ι η to 25 μ ι η, 25 μ ι η to 30 μ ι η, 30 μ ι η to 35 μ ι η, or 35 μ ι η to 40 μ ι η. Optionally, a ratio of a thickness of a respective one of the N pressure sensitive adhesive layers to a thickness of a respective one of the M flexible base layers is in a range of 0.75 to 1.0, 1.0 to 1.25, 1.25 to 1.50, 1.50 to 1.75, 1.75 to 2.0, 2.0 to 2.25, 2.25 to 2.5, or 2.5 to 2.75. The disclosed invention has found that when the thickness of the pressure sensitive adhesive layer and flexible base layer are within these selected ranges, the adhesive module of the invention unexpectedly resists cracking and other damage associated with bending strains and stresses.
In some embodiments, the method further comprises forming an adhesive support module for bending the display panel. Fig. 3C is a schematic diagram illustrating an adhesive support module in some embodiments according to the present disclosure. Referring to fig. 3C, in some embodiments, the adhesive support module includes a stack structure including a support layer SUS, N pressure sensitive adhesive layers (PSA1, …, PSAN) and M flexible base layers (BL1, …, BLM) alternately stacked together and adhered to a surface of the support layer SUS, and a second protective film PF 2. The first of the N pressure sensitive adhesive layers adheres the support layer SUS to the first of the M flexible base layers. The last of the N pressure sensitive adhesive layers adhered the second protective film PF2 to the last of the M flexible base layers.
Fig. 4A-4C illustrate methods of manufacturing curved display devices in some embodiments according to the present disclosure. Referring to fig. 4A, in some embodiments, the method includes providing an adhesive support module ASM from which a protective film (e.g., the second protective film PF2 of fig. 3C) is removed, and providing a display module including a display panel DP, a polarizer PL, an optically transparent adhesive layer OCA, and a cover CG. The adhesive support module ASM and the display module are aligned with each other. Referring to fig. 4B, the display module is adhered to the adhesive support module ASM, and a surface of the display panel is adhered to the last pressure sensitive adhesive layer in the adhesive support module ASM to form a display device. Referring to fig. 4C, the display device is bent to form one or more bent portions BP and a substantially flat portion SFP, thereby forming a curved display device. The inventors of the present disclosure have discovered that curved display devices made by the methods of the present invention are unexpectedly resistant to cracking and other damage associated with bending strains and stresses, particularly when the thickness of the pressure sensitive adhesive layer and flexible base layer are within certain selected ranges.
Examples of suitable curved display devices include, but are not limited to, electronic paper, mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo albums, GPS, and the like. Optionally, the curved display device further comprises one or more integrated circuits connected to the display panel. Optionally, the display panel is an organic light emitting diode display panel. Optionally, the display panel is a micro light emitting diode display panel.
The foregoing descriptions of embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or exemplary embodiments disclosed. The foregoing description is, therefore, to be considered illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in the art. The embodiments were chosen and described in order to explain the principles of the invention and its best mode practical application to thereby enable others skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the following claims and their equivalents, in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Thus, the terms "the present invention" and the like do not necessarily limit the scope of the claims to particular embodiments, and references to exemplary embodiments of the invention are not meant to limit the invention, and no such limitation is to be inferred. The invention is to be limited only by the spirit and scope of the appended claims. Furthermore, these claims may refer to the use of "first," "second," etc., followed by a noun or element. These terms should be understood as nomenclature and should not be construed as limiting the number of elements modified by these nomenclature, unless a specific number has been given. Any advantages and benefits described may not apply to all embodiments of the invention. It will be appreciated that variations to the described embodiments may be made by those skilled in the art without departing from the scope of the invention as defined by the appended claims. Furthermore, no element or component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the appended claims.
Claims (7)
1. A curved display device, comprising one or more bends at which the curved display device is bent;
wherein at least the one or more bending portions of the curved display device comprise a stacked structure, the stacked structure comprising:
a support layer;
a display panel on the support layer; and
n pressure sensitive adhesive layers and M flexible base layers between the support layer and the display panel, N being an integer of 3 or more and M being an integer of 2 or more;
wherein the N pressure sensitive adhesive layers and the M flexible base layers are alternately arranged;
a first one of the N pressure sensitive adhesive layers bonding the support layer and the first one of the M flexible base layers together;
the last of the N pressure sensitive adhesive layers bonds the display panel and the last of the M flexible base layers together;
each of the N pressure-sensitive adhesive layers has a thickness in a range of 30 to 55 μm;
each of the M flexible base layers has a thickness in a range of 20 μ M to 40 μ M; and
a ratio of a thickness of each of the N pressure sensitive adhesive layers to a thickness of each of the M flexible base layers is in a range of 0.75 to 2.75.
2. The curved display device of claim 1, wherein the ratio of the thickness of each of the N pressure sensitive adhesive layers to the thickness of each of the M flexible base layers is in the range of 1.5 to 1.375.
3. The curved display device of claim 1, further comprising a substantially flat portion connected to the one or more bends;
wherein the stacked structure is a structure extending over the substantially flat portion and the one or more bends;
the stacked structure is bent in the one or more bends; and
the N pressure sensitive adhesive layers and the M flexible base layers extend across the substantially flat portion and the one or more folds.
4. The curved display device of any one of claims 1 to 3, wherein the support layer is a metal support layer.
5. The curved display device of any one of claims 1 to 3, wherein the stacked structure further comprises:
the polaroid is positioned on one side of the display panel, which is far away from the supporting layer;
an optically transparent adhesive layer on a side of the polarizer remote from the display panel; and
a cover on a side of the optically clear adhesive layer distal from the polarizer.
6. The curved display device of any one of claims 1 to 3, wherein each of the N pressure sensitive adhesive layers comprises an acrylic-based adhesive material; and
each of the M flexible base layers includes an organic material.
7. The curved display device of any one of claims 1 to 3, wherein an nth one of the N pressure sensitive adhesive layers is bonded to two adjacent ones of the M flexible base layers, wherein 1< N < N; and
an mth one of the M flexible base layers is adhered to two adjacent ones of the N pressure sensitive adhesive layers, wherein M is 1. ltoreq. M.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022659635.6U CN214476052U (en) | 2020-11-17 | 2020-11-17 | Curved surface display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022659635.6U CN214476052U (en) | 2020-11-17 | 2020-11-17 | Curved surface display device |
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| CN214476052U true CN214476052U (en) | 2021-10-22 |
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| CN202022659635.6U Active CN214476052U (en) | 2020-11-17 | 2020-11-17 | Curved surface display device |
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