CN114783300A - Flexible display module - Google Patents
Flexible display module Download PDFInfo
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- CN114783300A CN114783300A CN202210601398.9A CN202210601398A CN114783300A CN 114783300 A CN114783300 A CN 114783300A CN 202210601398 A CN202210601398 A CN 202210601398A CN 114783300 A CN114783300 A CN 114783300A
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- flexible display
- negative poisson
- display module
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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Abstract
The embodiment of the invention discloses a flexible display module, which comprises a display panel; the buffer layer is arranged on one side of the flexible display panel; the buffer layer comprises uniformly arranged negative poisson's ratio structures. The buffer layer adopts the negative poisson ratio structure, and negative poisson ratio structure can concentrate the atress position gathering when receiving the impact, and instantaneous density increases, and the outside demonstrates higher rigidity to better realization atress cushioning effect improves the flexible display module's performances such as pen-down falling ball, thereby can strengthen the mechanical properties and the display effect of flexible display module, widens the application scope and the practical application of curling module, provides experience and theoretical guidance for the pile-up design of follow-up curling module simultaneously.
Description
Technical Field
The invention relates to the field of display panels, in particular to a flexible display module.
Background
Although flexible folding screens are produced in mass production continuously in the industry at present, the bending performance of the whole flexible folding screen can pass through 20 ten thousand times, the bending performance is guaranteed from the products of the three-star Galaxy and Z-Flip series which are produced in mass production and Hua MateX series, the ball falling height is greatly sacrificed, particularly the ball falling height of a bending area is only within 4cm and is far lower than the current SF screen ball falling performance (100cm), and the flexible OLED screen ball falling performance always becomes a key point which puzzles performance improvement.
In view of the above, there is a need to develop a novel flexible display module for solving the problem of low ball-dropping performance of the flexible screen in the prior art.
Disclosure of Invention
The embodiment of the invention provides a flexible display module, which is used for solving the problem of low ball falling performance of a flexible screen in the prior art.
In order to solve the above technical problem, the embodiment of the present invention discloses the following technical solutions:
the flexible display module comprises a display panel; the buffer layer is arranged on one side of the flexible display panel; the buffer layer comprises uniformly arranged negative poisson's ratio structures.
In addition to or in lieu of one or more of the features disclosed above, the negative poisson's ratio structure includes a plurality of negative poisson's ratio cells arranged in an array, the negative poisson's ratio cells having equal thickness cell walls, each of the negative poisson's ratio cell structures being the same size.
In addition to or in the alternative to one or more features disclosed above, the negative poisson's ratio structure includes at least 2 layers of the negative poisson's ratio cells.
In addition to or in the alternative to one or more of the features disclosed above, the negative poisson's ratio cells are concave hexagonal cells whose walls are regular concave hexagons.
In addition to or in the alternative to one or more of the features disclosed above, the recessed hexagonal cell includes two opposite included angles, each included angle has two sides, the two sides are recessed toward the inner side of the recessed hexagon, two parallel straight sides are disposed on two sides of the included angle, the length range of the straight sides is 1 micron to 1000 microns, the distance range between the two straight sides is 1 micron to 1000 microns, and the included angle is greater than 0 degree and smaller than 180 degrees.
In addition to or in lieu of one or more of the features disclosed above, a plurality of the straight sides of the recessed hexagonal cells are arranged in a row in a pairwise overlapping manner, and the recessed hexagonal cells between two adjacent rows are arranged in a staggered manner and connected in a pairwise overlapping manner by the side edges of the included angle, thereby obtaining a layered structure.
In addition to one or more of the features disclosed above, or alternatively, the angle of the included angle decreases and the distance between two of the straight sides decreases when the negative poisson's ratio structure is impacted.
In addition to or as an alternative to one or more of the features disclosed above, the dished hexagonal cell is a non-regular dished hexagonal cell.
In addition to or in the alternative to one or more of the features disclosed above, the negative poisson's ratio cells are tetragonal star cells with walls in a regular orthotetragonal star.
In addition or alternatively to one or more features disclosed above, the four corner star cells have a radius and four included angles, the radius having a length in a range from 1 micron to 1000 microns, and the included angles being greater than 0 degrees and less than 90 degrees.
In addition to or in the alternative to one or more of the features disclosed above, adjacent ones of the quadrangle star cells have a gap; when the negative Poisson ratio structure is impacted, the radius is reduced, the included angle is reduced, and the gap is reduced.
One of the above technical solutions has the following advantages or beneficial effects: the buffer layer adopts the negative poisson ratio structure, and negative poisson ratio structure can concentrate the atress position gathering when receiving the impact, and instantaneous density increases, and the outside demonstrates higher rigidity to better realization atress cushioning effect improves the flexible display module's performances such as pen-down falling ball, thereby can strengthen the mechanical properties and the display effect of flexible display module, widens the application scope and the practical application of curling module, provides experience and theoretical guidance for the pile-up design of follow-up curling module simultaneously.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a flexible display module according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a buffer layer provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a negative poisson's ratio cell according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural diagram of a negative Poisson ratio structure provided in example 1 of the present invention when impacted;
fig. 5 is a schematic structural diagram of a buffer layer provided in embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a negative poisson's ratio cell according to embodiment 1 of the present invention;
fig. 7 is a schematic structural diagram of the negative poisson's ratio structure according to embodiment 1 of the present invention when an impact is applied.
Reference numerals:
a flexible display module-100; a display panel-10;
a backsheet film layer-20; a buffer layer-30;
patterning the metal layer-40; a support layer-50;
a cover plate-60; a first adhesive layer-11;
a second adhesive layer-12; a third adhesive layer-13;
a fourth adhesive layer-14; a fifth adhesive layer-15;
negative poisson ratio cell-31.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of a flexible display module 100 according to an embodiment of the present invention, where the flexible display module 100 includes a display panel 10, a backplane film 20, a buffer layer 30, a patterned metal layer 40, a support layer 50, a cover plate 60, a first adhesive layer 11, a second adhesive layer 12, a third adhesive layer 13, a fourth adhesive layer 14, and a fifth adhesive layer 15.
The flexible display module 100 may have a display side and a back side opposite to each other in a thickness direction thereof, for example, the flexible display panel 10 may be an OLED display panel 10 to ensure good curling and bending properties.
The display panel 10 may include a driving circuit layer, an organic light emitting device, an encapsulation layer (not shown in the drawings), and the like, which are sequentially stacked, and it is understood that the driving circuit layer may include an inorganic insulating stack, a transistor, a storage capacitor, a signal line, and the like; the organic light emitting device may include an anode, an organic light emitting material, a cathode, and the like, and in addition, may further include a planarization layer, a pixel defining layer, a spacer, and the like, which are made of an organic material. The encapsulation layer may be a single layer structure made of inorganic materials, or may be a composite layer, that is: the encapsulation layer may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, which are sequentially stacked, the first inorganic encapsulation layer being closer to the organic light emitting device than the second inorganic encapsulation layer.
The back plate film layer 20 is adhered to the back side of the display panel 10 by the first adhesive layer 11, and the thickness of the back plate film layer 20 may be 40 μm to 60 μm, such as: 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, and the like; the elastic modulus of the backsheet film layer 20 may be 4Gpa to 8Gpa, such as: 4Gpa, 5Gpa, 6Gpa, 7Gpa, 8Gpa, and the like; the design can ensure the curling performance of the back plate film layer 20 while meeting the requirement of the protection function of the back plate film layer 20, thereby meeting the curling requirement of the whole flexible display module 100. In this embodiment, the first adhesive layer 11 may be an optical adhesive (OCA) to ensure good optical performance while ensuring adhesion stability, or a Pressure Sensitive Adhesive (PSA) to ensure adhesion stability while reducing cost.
The material of the back plate film layer 20 may include a Polyimide (PI) organic material to ensure that the back plate film layer 20 has good flexibility, but is not limited thereto, and the back plate film layer 20 may also be made of other materials, such as: PET (polyethylene terephthalate), CPI (polyimide), and the like, as the case may be.
The buffer layer 30 is bonded to the side of the back sheet film layer 20 away from the display panel 10 by the second adhesive layer 12. The second adhesive layer 12 may be an optical adhesive (OCA) to ensure good optical properties while ensuring adhesion stability, or a Pressure Sensitive Adhesive (PSA) to reduce cost while ensuring adhesion stability.
The patterned metal layer 40 is adhered to a side of the buffer layer 30 away from the display panel 10 by the third adhesive layer 13. The thickness of the patterned metal layer 40 may be 100 μm to 200 μm, such as: 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, 200 μm, and the like; and the modulus of elasticity of the patterned metal layer 40 may be 10Mpa to 200Mpa, such as: 10Mpa, 48Mpa, 86Mpa, 124Mpa, 162Mpa, 200Mpa, so the design can ensure the support performance of the patterned metal layer 40 and the curling performance of the patterned metal layer 40, thereby satisfying the curling requirement of the whole flexible display module 100. The third adhesive layer 13 may be an optical adhesive (OCA) to ensure good optical properties while ensuring adhesion stability, or a Pressure Sensitive Adhesive (PSA) to reduce cost while ensuring adhesion stability.
The support layer 50 is bonded to the display side of the display panel 10 by the fourth adhesive layer 14. The thickness of the support layer 50 may be 100 μm to 200 μm, such as: 100 μm, 120 μm, 140 μm, 160 μm, 180 μm, 200 μm, and the like; and the elastic modulus of the support layer 50 may be 10Mpa to 200Mpa, such as: 10Mpa, 48Mpa, 86Mpa, 124Mpa, 162Mpa, 200 Mpa; the design can ensure the buffering performance of the support layer 50 and ensure the curling performance of the support layer 50, thereby meeting the curling requirement of the whole flexible display module 100. The fourth adhesive layer 14 may be an optical adhesive (OCA) to ensure good optical properties while ensuring adhesion stability, or a Pressure Sensitive Adhesive (PSA) to ensure adhesion stability while reducing costs.
The cover plate 60 is adhered to the side of the support layer 50 away from the display panel 10 by the fifth adhesive layer 15, and the thickness of the cover plate 60 may be 40 μm to 60 μm, such as: 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, and the like; the modulus of elasticity of the cover plate 60 may be 4Gpa to 8Gpa, such as: 4Gpa, 5Gpa, 6Gpa, 7Gpa, 8Gpa, and the like; the design can satisfy the requirement of the protection function of the cover plate 60 and ensure the curling performance of the cover plate 60, thereby satisfying the curling requirement of the whole flexible display module 100. In this embodiment, the first adhesive layer 11 may be an optical adhesive (OCA) to ensure good optical performance while ensuring adhesion stability, or a Pressure Sensitive Adhesive (PSA) to reduce cost while ensuring adhesion stability.
The thickness of the first adhesive layer 11, the thickness of the second adhesive layer 12, the thickness of the third adhesive layer 13, the thickness of the fourth adhesive layer 14, and the thickness of the fifth adhesive layer 15 may be 10 μm to 50 μm, such as: 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc., and the thickness of the first adhesive layer 11, the thickness of the second adhesive layer 12, the thickness of the third adhesive layer 13, the thickness of the fourth adhesive layer 14, and the elastic modulus of the fifth adhesive layer 15 may be 20Mpa to 100Mpa, such as: 20MPa, 40MPa, 60MPa, 80MPa, 100MPa, etc.; the design can ensure the curling performance while ensuring the thickness of the first adhesive layer 11, the thickness of the second adhesive layer 12, the thickness of the third adhesive layer 13, the thickness of the fourth adhesive layer 14 and the bonding stability of the fifth adhesive layer 15, thereby meeting the curling requirement of the whole flexible display module 100.
The buffer layer 30 in the prior art has a low ball drop performance, and the negative poisson's ratio material is adopted in the embodiment to improve the problem. Compared with the traditional positive poisson ratio material, the negative poisson ratio material has some special properties, particularly in terms of elastic modulus and shear modulus, indentation resistance, energy absorption and the like, and the elastic modulus of the negative poisson ratio material used in the embodiment is not always constant and is also influenced by the density ratio and the volume change rate. In general, when a material is in tension, the modulus of elasticity decreases with increasing volumetric compression ratio; in a compressed state, the elastic modulus increases with the increase of the volume compression ratio, namely, the negative poisson ratio material gathers inwards when the material is compressed, the instantaneous density increases, and the outer part shows higher rigidity.
The negative Poisson's ratio material is used as the composite material reinforcement, for example, the composite material reinforcement is used for manufacturing the sandwich board, so that the safety of the sandwich board can be greatly improved. The explosion-proof curtain can effectively capture various accompanying fragments when being subjected to shock waves emitted by explosion. Due to good spherical surface fit, the material is used in a helmet, so that impact force is relieved to a certain extent, and damage to the head is reduced as much as possible. In addition, the negative Poisson ratio material can also be used for manufacturing medical intelligent bandages, medicaments with different functions are carried in the bandages, and corresponding medicaments can be released according to the degree of wound swelling to assist wound healing.
In this embodiment, a negative poisson's ratio material is applied to the buffer layer 30. Specifically, the buffer layer 30 includes a uniformly arranged negative poisson ratio structure, referring to fig. 2-4, the negative poisson ratio structure includes a plurality of negative poisson ratio cells 31 arranged in an array, the cell wall thickness of the negative poisson ratio cells 31 is equal, and the size of each negative poisson ratio cell 31 structure is the same. In this embodiment, the negative poisson's ratio structure includes four layers of negative poisson's ratio cells 31.
The negative poisson ratio cells 31 are concave hexagonal cells, the cell walls of the concave hexagonal cells are regular concave hexagons, and the concave hexagonal cells are non-regular concave hexagonal cells. The concave hexagon unit cell comprises two opposite included angles theta, each included angle theta is provided with two side edges, the two side edges are sunken towards the inner side of the concave hexagon, two parallel straight edges b are arranged on two sides of the included angle theta, the length range of the straight edges b is 1-1000 micrometers, the distance a between the two straight edges b ranges from 1-1000 micrometers, and the included angle theta is larger than 0 degree and smaller than 90 degrees.
The straight sides b of the plurality of concave hexagonal cells are overlapped and arranged in rows in pairs, the concave hexagonal cells between two adjacent rows are staggered and connected in pairs through the side edges of the included angle theta, and thus the layered structure is obtained. When the negative Poisson ratio structure is impacted, the negative Poisson ratio structure is gathered to the concentrated stress part, the angle of the included angle theta is reduced, and the distance a between the two straight edges b is reduced.
When the negative poisson ratio structure is in a compression state, the elastic modulus is increased along with the increase of the volume compression ratio, namely, the negative poisson ratio structure is gathered towards the inside when being compressed, the instantaneous density is increased, and the outside shows higher rigidity, thereby better realizing the stress buffering effect, improving the performances of the flexible display module 100 such as pen falling, ball falling and the like, further enhancing the mechanical performance and the display effect of the flexible display module 100, widening the application range and the actual application of the curling module, and simultaneously providing experience and theoretical guidance for the stacking design of the subsequent curling module.
Example 2
The structure of the flexible display module 100 of this embodiment is substantially the same as that of the flexible display module 100 of embodiment 1, and the buffer layer 30 includes a uniformly arranged negative poisson ratio structure, and the negative poisson ratio structure includes a plurality of negative poisson ratio unit cells 31 arranged in an array, and the specific structure thereof can refer to embodiment 1, and is different from embodiment 1 in that the negative poisson ratio unit cells 31 are four-pointed star unit cells.
Referring to fig. 5-7, the cell walls of the tetragonal star shaped cells are regular tetragonal stars, the tetragonal star shaped cells have a radius R and four included angles Φ, the length of the radius R ranges from 1 micron to 1000 microns, and the included angle Φ is greater than 0 degree and smaller than 90 degrees. Two adjacent quadrangle star-shaped cells have a gap. When the negative Poisson's ratio structure is impacted, the negative Poisson's ratio structure is gathered to a centralized stressed part, the radius R is reduced, the angle of the included angle phi is reduced, and the gap is reduced.
When the negative poisson ratio structure is in a compression state, the elastic modulus is increased along with the increase of the volume compression ratio, namely, the negative poisson ratio structure is gathered towards the inside when being compressed, the instantaneous density is increased, and the outside shows higher rigidity, thereby better realizing the stress buffering effect, improving the performances of the flexible display module 100 such as pen falling, ball falling and the like, further enhancing the mechanical performance and the display effect of the flexible display module 100, widening the application range and the actual application of the curling module, and simultaneously providing experience and theoretical guidance for the stacking design of the subsequent curling module.
The flexible display module provided by the embodiment of the invention is described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A flexible display module is characterized by comprising
A display panel;
the buffer layer is arranged on one side of the flexible display panel;
the buffer layer comprises uniformly arranged negative poisson's ratio structures.
2. The flexible display module of claim 1, wherein the negative poisson ratio structure comprises a plurality of negative poisson ratio cells arranged in an array, the cell walls of the negative poisson ratio cells are equal in thickness, and each negative poisson ratio cell structure is the same in size.
3. The flexible display module of claim 2, wherein the negative poisson's ratio structure comprises at least 2 layers of the negative poisson's ratio cells.
4. The flexible display module of claim 3, wherein the negative Poisson's ratio cells are concave hexagonal cells, and the walls of the concave hexagonal cells are regular concave hexagons.
5. The flexible display module according to claim 4, wherein the recessed hexagonal cell comprises two opposite included angles, each included angle has two sides, the two sides are recessed toward an inner side of the recessed hexagon, two parallel straight sides are disposed on two sides of the included angle, a length of each straight side ranges from 1 micron to 1000 microns, a distance between the two straight sides ranges from 1 micron to 1000 microns, and the included angle is greater than 0 degree and smaller than 180 degrees.
6. The flexible display module according to claim 5, wherein the straight sides of the plurality of concave hexagonal cells are arranged in rows in a pairwise overlapping manner, and the concave hexagonal cells between two adjacent rows are arranged in a staggered manner and connected in a pairwise overlapping manner by the sides of the included angle, thereby obtaining a layered structure.
7. The flexible display module of claim 5, wherein the angle of the included angle decreases and the distance between two of the straight sides decreases when the negative Poisson's ratio structure is impacted.
8. The flexible display module of claim 3, wherein the negative Poisson ratio cells are quadrangle star cells, and the walls of the quadrangle star cells are regular quadrangle stars.
9. The flexible display module of claim 8, wherein the four-pointed star cells have a radius and four included angles, the radius having a length in a range of 1 micron to 1000 microns, and the included angles being greater than 0 degrees and less than 90 degrees.
10. The flexible display module of claim 9, wherein two adjacent ones of said four-pointed star-shaped cells have a gap; when the negative Poisson ratio structure is impacted, the radius is reduced, the included angle is reduced, and the gap is reduced.
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| CN202210601398.9A CN114783300A (en) | 2022-05-30 | 2022-05-30 | Flexible display module |
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| CN202210601398.9A CN114783300A (en) | 2022-05-30 | 2022-05-30 | Flexible display module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116416878A (en) * | 2023-03-22 | 2023-07-11 | 大连理工大学 | Flexible LED lattice screen without image distortion under large stretching quantity |
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| CN114052737A (en) * | 2021-11-20 | 2022-02-18 | 吉林大学 | Flexible electrode connected with concave honeycomb negative Poisson ratio structure and application |
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