CN115132088B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN115132088B CN115132088B CN202210828922.6A CN202210828922A CN115132088B CN 115132088 B CN115132088 B CN 115132088B CN 202210828922 A CN202210828922 A CN 202210828922A CN 115132088 B CN115132088 B CN 115132088B
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- 239000010410 layer Substances 0.000 claims abstract description 198
- 230000003287 optical effect Effects 0.000 claims abstract description 171
- 239000012790 adhesive layer Substances 0.000 claims abstract description 164
- 239000000758 substrate Substances 0.000 claims abstract description 60
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 239000002346 layers by function Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 19
- 238000005452 bending Methods 0.000 claims description 13
- 238000003475 lamination Methods 0.000 claims description 4
- 239000010408 film Substances 0.000 description 42
- 239000003292 glue Substances 0.000 description 35
- 239000000084 colloidal system Substances 0.000 description 24
- 239000003990 capacitor Substances 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 10
- 239000004568 cement Substances 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229920001721 polyimide Polymers 0.000 description 4
- 238000005538 encapsulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005552 hardfacing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The application provides a display panel and a display device. The display panel comprises a substrate, a display functional layer arranged on the substrate, a composite adhesive layer arranged on one side of the display functional layer away from the substrate, and a cover plate arranged on one side of the composite adhesive layer away from the substrate. The composite adhesive layer comprises a first optical adhesive layer, a supporting layer and a second optical adhesive layer, wherein the first optical adhesive layer is located on one side, far away from the substrate, of the display functional layer, the supporting layer is located on one side, far away from the display functional layer, of the first optical adhesive layer, the second optical adhesive layer is located on one side, far away from the first optical adhesive layer, of the supporting layer, protrusions and depressions are formed in the surface, facing the first optical adhesive layer and/or the surface, facing the second optical adhesive layer, of the supporting layer, the depressions are filled with the first optical adhesive layer and/or the second optical adhesive layer, and the protrusions are covered by the first optical adhesive layer and/or the second optical adhesive layer.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
The flexible display panel is more and more applied to display devices such as mobile phones and computers due to the characteristics of convenience in bending and carrying, multiple use scenes and the like.
The supporting force of the optical cement structure in the existing flexible display panel to the flexible cover plate is insufficient, so that the bending area of the flexible display panel is easy to generate dents, and the display function layer under the flexible cover plate is damaged.
Disclosure of Invention
The application provides a display panel and a display device.
A first aspect of an embodiment of the present application provides a display panel. The display panel includes:
a substrate;
the composite adhesive layer is positioned on one side of the display functional layer far away from the substrate, the composite adhesive layer comprises a first optical adhesive layer, a supporting layer and a second optical adhesive layer, the first optical adhesive layer is positioned on one side of the display functional layer far away from the substrate, the supporting layer is positioned on one side of the first optical adhesive layer far away from the display functional layer, the second optical adhesive layer is positioned on one side of the supporting layer far away from the first optical adhesive layer, the surface of the supporting layer facing the first optical adhesive layer and/or the second optical adhesive layer is provided with a protrusion and a recess, the recess is filled with the first optical adhesive layer and/or the second optical adhesive layer, and the protrusion is covered by the first optical adhesive layer and/or the second optical adhesive layer;
and the cover plate is positioned on one side of the composite adhesive layer away from the substrate.
In one embodiment, the width of the recess is 0.8 to 1.5 times the width of the projection in a direction parallel to the display panel.
In one embodiment, the support layer includes a support connection portion that separates the first optical adhesive layer and the second optical adhesive layer, a plurality of protrusions are disposed on a surface of the support connection portion facing the first optical adhesive layer and/or the second optical adhesive layer, and the recesses are disposed between adjacent protrusions.
In one embodiment, the thickness of the protrusion is 1 to 1.5 times the thickness of the support connection portion in a direction perpendicular to the display panel.
In one embodiment, the thickness of the support connection portion is 5um to 10um.
In one embodiment, a distance between a surface of the support layer facing the protrusion on a side of the substrate and a surface of the first optical adhesive layer facing the substrate is greater than or equal to a thickness of the support connection; the distance between the surface of the protrusion on the surface of the supporting layer, which faces away from the substrate, and the surface of the second optical adhesive layer, which faces away from the substrate, is greater than or equal to the thickness of the supporting connection portion.
In one embodiment, the arrangement direction of the protrusions and the depressions is the same as the bending direction of the display panel, and the extending direction of the protrusions and the depressions is perpendicular to the bending direction of the display panel.
In one embodiment, the protrusions have a rectangular, triangular or semicircular shape in cross section in the film lamination layer direction of the display panel.
In one embodiment, the ratio of the refractive index of the support layer to the refractive index of the first optical cement layer is 0.8-1.2, and/or the ratio of the refractive index of the support layer to the refractive index of the second optical cement layer is 0.8-1.2.
In one embodiment, the material of the supporting layer is a light-transmitting material.
In one embodiment, the elastic modulus of the first optical cement layer and/or the second optical cement layer is less than the elastic modulus of the support layer.
In one embodiment, the elastic modulus of the first optical adhesive layer and/or the second optical adhesive layer ranges from 20Kpa to 30Kpa, and the elastic modulus of the supporting layer ranges from 3Gpa to 6Gpa.
A second aspect of the embodiments of the present application provides a display device, which includes the display panel described above.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a partial cross-sectional view of a display panel according to an embodiment of the present application;
FIG. 2 is a schematic view of a portion of a display panel according to an embodiment of the application in a non-use state;
FIG. 3 is a partial cross-sectional view of a display panel according to an embodiment of the present application in which the protrusions on the support layer are rectangular protrusions;
FIG. 4 is a partial cross-sectional view of a support layer of a display panel according to an embodiment of the present application with triangular protrusions;
FIG. 5 is a partial cross-sectional view of a support layer of a display panel according to an embodiment of the present application with semi-circular protrusions;
FIG. 6 is a schematic view of a supporting layer of a display panel according to an embodiment of the present application when the protrusions of the supporting layer are rectangular protrusions;
FIG. 7 is a top view of the support layer shown in FIG. 6;
FIG. 8 is a top view of a supporting layer of a display panel according to another embodiment of the present application when the protrusions of the supporting layer are rectangular protrusions;
fig. 9 is a partial cross-sectional view of a display device according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the terms first, second and the like used in the description and the claims do not denote any order, quantity or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded.
The display panel and the display device according to the embodiments of the present application are described in detail below with reference to the accompanying drawings. The features of the examples and embodiments described below may be supplemented or combined with one another without conflict.
The embodiment of the application provides a display panel. As shown in fig. 1, the display panel includes a substrate 10, a display functional layer 20 disposed on the substrate 10, a composite adhesive layer 30 disposed on a side of the display functional layer 20 away from the substrate, and a cover plate 40 disposed on a side of the composite adhesive layer 30 away from the substrate 10. The composite glue layer 30 comprises a first optical glue layer 301, a supporting layer 302 and a second optical glue layer 303, wherein the first optical glue layer 301 is located on one side of the display function layer 20 away from the substrate 10, the supporting layer 302 is located on one side of the first optical glue layer 301 away from the display function layer 20, and the second optical glue layer 303 is located on one side of the supporting layer 302 away from the first optical glue layer 301. The surface of the support layer 302 facing the first optical adhesive layer 301 and/or the second optical adhesive layer 303 is provided with a protrusion 3022 and a recess 3023, the recess 3023 is filled with the first optical adhesive layer and/or the second optical adhesive layer, and the protrusion 3022 is covered by the first optical adhesive layer and/or the second optical adhesive layer.
When the conventional display panel is bent, taking the display panel in a non-working state (refer to fig. 2) as an example, when the display panel is bent, relative dislocation occurs between different film layers, the colloid of the conventional display panel facing the substrate side is stretched to generate a thinning trend, in order to maintain adhesion between the optical adhesive and the display functional layer, the colloid of the optical adhesive facing the substrate side and the display functional layer are relatively high in stress, so that peeling phenomenon is easily generated between the film layers, or the colloid of the conventional display panel facing the substrate side is extruded, but due to the lack of a protrusion structure similar to the protrusion structure in the application, the colloid of the optical adhesive facing the substrate side is deformed, so that the colloid of the optical adhesive facing the substrate side and the cover plate are also required to be relatively high in stress to maintain adhesion between the film layers, and the film layer peeling phenomenon is also easily generated. Moreover, the whole optical adhesive layer of the existing display panel is softer, when the cover plate of the display panel is extruded by external force, the surface of the display panel is easy to be provided with indentations, and then the display function layer under the flexible cover plate is damaged, so that the performance of the device is affected.
According to the display panel provided by the embodiment of the application, the supporting layer 302 is disposed between the first optical adhesive layer 301 and the second optical adhesive layer 303, when the display panel is bent, for example, when the display panel is in a non-working state, as shown in fig. 2, the composite adhesive layer 30 is bent, relative dislocation occurs between different film layers, the first optical adhesive layer 301 is stretched, and because the surface of the supporting connection portion 3021 facing the first optical adhesive layer 301 can be provided with the protrusion 3022, the protrusion 3022 can block the stretching of the colloid of the first optical adhesive layer 301 in the recess 3023 between the protrusions 3022, the protrusion 3022 and the colloid of the first optical adhesive layer 301 are mutually extruded, so that the colloid of the first optical adhesive layer 301 is deformed in the direction of the display function layer 20, which is beneficial to reducing the stress between the first optical adhesive layer 301 and the display function layer 20, and avoiding the occurrence of film peeling between the first optical adhesive layer 301 and the display function layer. Or the composite adhesive layer 30 is bent, the second optical adhesive layer 303 is extruded, the protrusion 3022 located on the surface of the support connection portion 3021 facing the second optical adhesive layer 303 is extruded to extrude the colloid of the second optical adhesive layer 303 located in the recess 3023 between the protrusions 3022, so as to further guide the colloid of the second optical adhesive layer 303 to deform toward the cover plate 40, which is beneficial to reducing stress between the second optical adhesive layer 303 and the cover plate 40, and avoiding film peeling between the second optical adhesive layer 303 and the cover plate 40. When the cover 40 receives an external force, the supporting layer 302 may provide a supporting force for the cover 40, so as to prevent the surface of the display panel from generating a recess 3023 and further damage the film layers such as the display function layer.
In one embodiment, the substrate 10 is a flexible substrate. The material of the flexible substrate may include one or more of polyimide, polyethylene terephthalate, and polycarbonate.
In one embodiment, the display function layer 20 includes a first electrode, an organic light emitting material layer, and a second electrode. Wherein the first electrode is an anode, disposed adjacent to the substrate 10; the second electrode is a cathode and is located on the side of the first electrode remote from the substrate 10. An organic light emitting material layer is located between the first electrode and the second electrode.
In one embodiment, the display panel further includes a pixel driving circuit layer between the substrate 10 and the display function layer 20. The pixel driving circuit layer includes a plurality of pixel circuits corresponding to the plurality of sub-pixels included in the display function layer 20. The pixel circuit includes a thin film transistor and a capacitor. The thin film transistor includes an active layer, a gate electrode, a first electrode, and a second electrode. One of the first pole and the second pole is a source electrode, and the other is a drain electrode. The capacitor comprises a first capacitor plate and a second capacitor plate positioned on one side of the first capacitor plate away from the substrate. Wherein the gate electrode and the first capacitor plate can be arranged on the same layer; the first pole and the second pole may be arranged in the same layer. The arrangement of two structures on the same layer means that the two structures are positioned on the same layer and made of the same material, and can be formed simultaneously in one patterning process.
The pixel driving circuit layer may further include a gate insulating layer, a capacitor insulating layer, an interlayer dielectric layer, a connection portion, a first planarization layer, and a second planarization layer. The gate insulating layer is positioned between the active layer and the gate electrode, the capacitor insulating layer is positioned between the first capacitor electrode plate and the second capacitor electrode plate, the interlayer dielectric layer is positioned between the second capacitor electrode plate and the first planarization layer, and the connecting part is positioned between the first planarization layer and the second planarization layer and is electrically connected with the second electrode through a through hole penetrating through the first planarization layer. One part of the first pole and the second pole is positioned between the interlayer dielectric layer and the first planarization layer, and the other part of the first pole and the second pole is electrically connected with the active layer through a through hole penetrating through the interlayer dielectric layer, the capacitor insulating layer and the gate insulating layer.
In one embodiment, the display panel further comprises a light shielding layer of the display function layer on a side of the display function layer 20 facing away from the substrate 10, a flat layer of the light shielding layer on a side of the light shielding layer facing away from the substrate 10, and a color filter layer of the flat layer facing away from the substrate 10. Wherein the upper surface of the planarization layer (the surface adjacent to the color filter layer) has a high planarization degree to ensure the quality of the color filter layer formed thereon. The light shielding layer, the planarization layer and the color filter layer are all located between the display functional layer 20 and the first optical adhesive layer 301.
The display function layer 20 includes a plurality of sub-pixels, and the light shielding layer includes a plurality of light shielding portions, each for shielding an area between adjacent sub-pixels. The pixel circuit is formed in a region between adjacent sub-pixels. The orthographic projection of the light shielding portion on the substrate 10 is located between orthographic projections of adjacent sub-pixels on the substrate 10. The color filter layer comprises a plurality of color resistance units, and the surface of each color resistance unit facing to one side of the substrate is basically flat. Each color resistance unit is positioned above each sub-pixel and is used for filtering light emitted by the sub-pixels. However, the orthographic projection of each color resistance unit on the substrate may overlap with the orthographic projection of the light shielding layer on the substrate, that is, the color resistance unit may cover not only the area where the sub-pixels are located but also a part of the area between the sub-pixels.
In one embodiment, the display panel further includes an encapsulation layer on a side of the display function layer 20 facing away from the substrate 10, and a touch control layer on a side of the encapsulation layer facing away from the substrate. The encapsulation layer and the touch layer are both located between the display function layer 20 and the first optical adhesive layer 301. The packaging layer may be a thin film packaging layer, where the thin film packaging layer includes alternately arranged inorganic film layers and organic film layers, for example, the thin film packaging layer includes a first inorganic film layer, an organic film layer located on a side of the first inorganic film layer facing away from the substrate, and a second inorganic film layer located on a side of the organic film layer facing away from the substrate.
In one embodiment, the materials of the first optical adhesive layer 301 and the second optical adhesive layer 303 may be acrylic materials, or may be materials with good adhesion and light transmittance such as silicone.
In one embodiment, as shown in fig. 3, in a direction parallel to the display panel, the width d2 of the recess 3023 is 0.8 to 1.5 times the width d1 of the protrusion 3022, and the width d1 of the protrusion 3022 may have a value ranging from 3um to 8um. By this arrangement, the recess 3023 may be prevented from having too large a width, so that the supporting performance of the supporting layer 302 on the flexible cover 40 is reduced, and the flexible cover 40 is caused to be dented at the position of the recess 3023 by an external force, thereby affecting the performance of the display panel. The too small width of the recess 3023 may be avoided, the too small amount of glue in the recess 3023 may cause the extrusion effect of the protrusion 3022 on the glue of the first optical glue layer 301 to be poor when the first optical glue layer 301 is extruded due to the bending of the display panel, which is not beneficial to deformation of the first optical glue layer 301 and adhesion of the first optical glue layer 301 to the display function layer; or when the second optical adhesive layer 303 is extruded due to bending of the display panel, the extrusion effect of the protrusion 3022 on the glue of the second optical adhesive layer 303 is poor, which is not beneficial to deformation of the second optical adhesive layer 303 and adhesion of the second optical adhesive layer 303 to the cover plate 40.
In one embodiment, the support layer 302 includes a support connection 3021, the support connection 3021 separates the first optical adhesive layer 301 and the second optical adhesive layer 303, a plurality of protrusions 3022 are disposed on a surface of the support connection 3021 facing the first optical adhesive layer 301 and/or the second optical adhesive layer 303, and recesses 3023 are disposed between adjacent protrusions 3022. In other embodiments, the support connection portion 3021 may only separate a portion of the first optical adhesive layer 301 from a portion of the second optical adhesive layer 303, that is, the support connection portion 3021 may be provided with a hollowed portion, and a portion of the first optical adhesive layer 301 and a portion of the second optical adhesive layer 303 may be contacted by the hollowed portion.
In one embodiment, as shown in FIG. 3, the thickness of the support layer 302 ranges from 5um to 10um. The thickness d3 of the support connection 3021 may be, for example, 5um, 7um, 9um, 10um, or the like. By the arrangement, the excessive rigidity of the supporting layer 302 caused by the too thick thickness of the supporting layer 302 can be avoided, and further the bending of the display panel is influenced; too small a thickness of the support layer 302 can be avoided, resulting in a poor support effect of the support layer 302 on the flexible cover 40.
In one embodiment, as shown in fig. 3, the thickness d4 of the protrusion 3022 is 1 to 1.5 times the thickness d3 of the supporting layer 302 in a direction perpendicular to the display panel. So configured, the thickness of the protrusion 3022 is comparable to the thickness of the supporting layer 302, and the protrusion 3022 may provide better support. Meanwhile, when the first optical adhesive layer 301 or the second optical adhesive layer 303 is bent and stretched, the above arrangement can better prevent the colloid of the first optical adhesive layer 301 or the colloid of the second optical adhesive layer 303 in the recess 3023 from being stretched and thinned, so that the colloid of the first optical adhesive layer 301 or the colloid of the second optical adhesive layer 303 is deformed along the protrusion 3022, which is beneficial to reducing the stress between the first optical adhesive layer 301 and the display function layer 20, and preventing the film peeling phenomenon from occurring; when the first optical adhesive layer 301 or the second optical adhesive layer 303 is bent and compressed, the protrusions 3022 may better guide the glue of the first optical adhesive layer 301 or the glue of the second optical adhesive layer 303 to deform, which is beneficial to reducing stress between the second optical adhesive layer 303 and the cover 40 and preventing the occurrence of film peeling.
In one embodiment, as shown in fig. 3, a distance d5 between a surface of the support layer 302 facing the protrusion 3022 on a side of the substrate 10 and a surface of the first optical adhesive layer 301 facing the substrate 10 is greater than or equal to a thickness of the support connection portion, e.g., d5 is not less than 10um; the distance d6 between the surface of the protrusion 3022 on the side of the support layer 302 facing away from the substrate 10 and the surface of the second optical adhesive layer 303 facing away from the substrate 10 is greater than or equal to the thickness of the support connection portion, for example d6 is not less than 10um. When the display panel is bent, the first optical adhesive layer 301 and the supporting layer 302, and the second optical adhesive layer 303 and the cover plate 40 are pressed against each other, if the thickness of the glue between the surface of the protrusion 3022 on the surface of the supporting layer 302 facing the substrate 10 and the surface of the first optical adhesive layer 301 facing the substrate 10 is too thin, or the thickness of the glue between the surface of the protrusion 3022 on the surface of the supporting layer 302 facing away from the substrate 10 and the surface of the second optical adhesive layer 303 facing away from the substrate 10 is too thin, the viscosity of the thinner glue is low, and the different film layers cannot be effectively bonded. By the arrangement, the colloid has a certain thickness, so that the adhesiveness of the first optical adhesive layer 301 and the second optical adhesive layer 303 is stronger, and the film peeling phenomenon is better prevented.
In one embodiment, as shown in fig. 3, the cross section of the protrusion 3022 in the film lamination layer direction (i.e., vertical direction) of the display panel is rectangular in shape. So set up, the tip of protruding 3022 facing away from supporting layer 302 is wider, when flexible apron 40 receives external force extrusion, rectangular protruding 3022 can make display panel has better supportability, is favorable to avoiding flexible apron 40 or other rete to take place sunken 3023. In other embodiments, the protrusion 3022 may have other shapes, and as shown in fig. 4 and 5, the protrusion 3022 may have a triangular shape or a semicircular shape.
In one embodiment, as shown in fig. 6, the arrangement direction of the protrusions and the depressions is the same as the bending direction of the display panel, and the extending direction of the protrusions and the depressions is perpendicular to the bending direction of the display panel. The arrangement direction of the protrusions and the depressions is the x direction, and the extension direction of the protrusions and the depressions is the y direction. So set up, protruding with sunken mode of arranging is favorable to display panel to produce and buckles, and because protruding with sunken direction of arranging with display panel's the direction of buckling is the same, when display panel buckles, protruding can more effectual guide colloid in the sunken takes place deformation, prevents the emergence of rete peeling phenomenon.
In one embodiment, as shown in fig. 6 and 7, taking a cross-sectional shape of the protrusions 3022 in the film lamination layer direction (i.e., the vertical direction) of the display panel as an example, each of the protrusions 3022 is a continuous elongated protrusion extending to the boundary of the support connection portion 3021. In other embodiments, each of the protrusions 3022 may be discontinuous, as shown in fig. 8, and each of the protrusions may be broken into multiple portions from the middle.
In one embodiment, the ratio of the refractive index of the support layer to the refractive index of the first optical cement layer is 0.8-1.2, and/or the ratio of the refractive index of the support layer to the refractive index of the second optical cement layer is 0.8-1.2. The arrangement can make the refractive indexes of the supporting layer 302 and the first optical adhesive layer 301 and the second optical adhesive layer 303 close, so that the problem of light path interference can be avoided, and the display panel has better display effect.
In one embodiment, the material of the support layer 302 is a light transmissive material. For example, the material of the support layer 302 may be polyethylene terephthalate, polycarbonate, polymethyl methacrylate, or the like. When the above material is used for the supporting layer 302, the refractive indexes of the supporting layer 302 and the first optical adhesive layer 301 and the second optical adhesive layer 303 are close, so that the problem of optical path interference can be avoided, and meanwhile, the rigidity of the supporting layer 302 is better by using the above material, so that the supporting layer 302 has better supporting performance.
In one embodiment, the elastic modulus of the first optical adhesive layer 301 and/or the second optical adhesive layer 303 is less than the elastic modulus of the support layer 302. So set up, when the display panel takes place to buckle, first optics glue film 301 receives the extrusion, is located support connecting portion 3021 face first optics glue film 301's surface protruding 3022, extrusion is located first optics glue film 301's colloid in recess 3023 between protruding 3022, because first optics glue film 301's elastic modulus is less, first optics glue film 301 takes place deformation more easily, more is favorable to protruding 3022 guide first optics glue film 301's colloid takes place deformation towards the display function layer reduces the stress between first optics glue film 301 and the display function layer 20 prevent first optics glue film 301 with take place the peeling off between the display function layer. Or, when the display panel is bent, the second optical adhesive layer 303 is pressed, the protrusion 3022 located on the surface of the support connection portion 3021 facing the second optical adhesive layer 303 presses the colloid of the second optical adhesive layer 303 located in the recess 3023 between the protrusions 3022, and the second optical adhesive layer 303 is easier to deform due to the smaller elastic modulus of the second optical adhesive layer 303, which is more beneficial for the protrusion 3022 to guide the colloid of the second optical adhesive layer 303 to deform toward the cover plate 40, which is more beneficial for reducing the stress between the second optical adhesive layer 303 and the cover plate 40, and preventing the peeling between the second optical adhesive layer 303 and the cover plate 40. The supporting layer 302 has a certain rigidity, so that the supporting layer 302 has better supporting performance, and meanwhile, the elastic modulus of the composite film layer of the supporting layer 302 and the first optical adhesive layer 301 and the second optical adhesive layer 303 is lower, so that the display panel has good bending performance.
In one embodiment, the elastic modulus of the first optical adhesive layer 301 and/or the second optical adhesive layer 303 ranges from 20Kpa to 30Kpa (kilopascals), and the elastic modulus of the support layer 302 ranges from 3Gpa to 6Gpa (1gpa=1000000 pa). The elastic moduli of the first optical adhesive layer 301 and the second optical adhesive layer 303 may be, for example, 20Kpa, 23Kpa, 26Kpa, 30Kpa, etc. The elastic modulus of the optical adhesive layer of the existing display panel is in the range of 30Kpa to 50Kpa, and when the display panel is bent, the stress required for maintaining the adhesion of the optical adhesive layer and other film layers is large, so that the film layers are easy to peel. So set up, when the display panel takes place to buckle, first optics glue film 301 receives the extrusion, is located support connecting portion 3021 face first optics glue film 301's surface protruding 3022, extrusion is located first optics glue film 301's colloid in recess 3023 between protruding 3022, because first optics glue film 301's elastic modulus is less, first optics glue film 301 takes place deformation more easily, more is favorable to protruding 3022 guide first optics glue film 301's colloid takes place deformation towards the display function layer reduces the stress between first optics glue film 301 and the display function layer 20 prevent first optics glue film 301 with take place the peeling off between the display function layer. Or, when the display panel is bent, the second optical adhesive layer 303 is pressed, the protrusion 3022 located on the surface of the support connection portion 3021 facing the second optical adhesive layer 303 presses the colloid of the second optical adhesive layer 303 located in the recess 3023 between the protrusions 3022, and the second optical adhesive layer 303 is easier to deform due to the smaller elastic modulus of the second optical adhesive layer 303, which is more beneficial for the protrusion 3022 to guide the colloid of the second optical adhesive layer 303 to deform toward the cover plate 40, which is more beneficial for reducing the stress between the second optical adhesive layer 303 and the cover plate 40, and preventing the peeling between the second optical adhesive layer 303 and the cover plate 40. The elastic modulus of the supporting layer 302 ranges from 3Gpa to 6Gpa, the supporting layer 302 has a certain rigidity, so that the supporting layer 302 has better supporting performance, and meanwhile, the elastic modulus of a composite film layer of the supporting layer 302 and the first optical adhesive layer 301 and the second optical adhesive layer 303 is lower, so that the display panel has good bending performance.
In one embodiment, the supporting layer 302 may be prepared by hot press molding, and then the first optical adhesive layer 301 or the second optical adhesive layer 303 is coated on the supporting layer 302 by a wet coating process.
In one embodiment, the flexible cover 40 includes a transparent polyimide film layer and a case hardening layer on the transparent polyimide film layer. In some embodiments, the transparent polyimide film layer has a thickness of 50um and the hardfacing layer has a thickness of 10um.
The embodiment of the application also provides a display device, which comprises the display panel of any embodiment.
In one embodiment, as shown in fig. 9, the display device includes an adhesive layer 50 and a metal chassis 60, wherein the adhesive layer 50 is located between the substrate 10 and the metal chassis 60, and is used for bonding the display panel and the metal chassis 60. The metal chassis 60 may provide support and heat dissipation for the display panel. Specifically, the material of the adhesive layer 50 may be foam or optical cement, and the material of the metal base plate 60 may be stainless steel or titanium alloy material.
In one embodiment, the display device further includes a driver for providing a driving signal for driving the pixel circuit, and a power supply circuit for supplying power to the display panel.
The display device provided by the embodiment of the application can be any device with a display function, such as a mobile phone, a tablet personal computer, a television, a notebook computer, a vehicle-mounted device and the like.
The present application is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present application can be made by those skilled in the art without departing from the scope of the present application.
The disclosure of this patent document contains material which is subject to copyright protection. The copyright is owned by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and trademark office patent files or records.
Claims (12)
1. A display panel, the display panel comprising:
a substrate;
a display functional layer located on the substrate;
the composite adhesive layer is positioned on one side of the display functional layer far away from the substrate, the composite adhesive layer comprises a first optical adhesive layer, a supporting layer and a second optical adhesive layer, the first optical adhesive layer is positioned on one side of the display functional layer far away from the substrate, the supporting layer is positioned on one side of the first optical adhesive layer far away from the display functional layer, the second optical adhesive layer is positioned on one side of the supporting layer far away from the first optical adhesive layer, the surface of the supporting layer facing the first optical adhesive layer and/or the second optical adhesive layer is provided with a bulge and a recess, the recess is filled with the first optical adhesive layer and/or the second optical adhesive layer, the bulge is covered by the first optical adhesive layer and/or the second optical adhesive layer, the supporting layer comprises a supporting connecting part, the supporting connecting part separates the first optical adhesive layer from the second optical adhesive layer, a plurality of bulges are arranged on the surface of the supporting connecting part facing the first optical adhesive layer and/or the second optical adhesive layer, and the bulges are arranged between the adjacent bulges;
and the cover plate is positioned on one side of the composite adhesive layer away from the substrate.
2. The display panel according to claim 1, wherein the width of the recess is 0.8 to 1.5 times the width of the projection in a direction parallel to the display panel.
3. The display panel according to claim 1, wherein the thickness of the protrusion is 1 to 1.5 times the thickness of the support connection portion in a direction perpendicular to the display panel.
4. The display panel according to claim 1, wherein the thickness of the support connection portion is 5um to 10um.
5. The display panel according to claim 1, wherein a distance between a surface of the protrusion on a side of the support layer facing the substrate and a surface of the first optical adhesive layer facing the substrate is greater than or equal to a thickness of the support connection portion; the distance between the surface of the protrusion on the surface of the supporting layer, which faces away from the substrate, and the surface of the second optical adhesive layer, which faces away from the substrate, is greater than or equal to the thickness of the supporting connection portion.
6. The display panel according to claim 1, wherein an arrangement direction of the protrusions and the depressions is the same as a bending direction of the display panel, and an extension direction of the protrusions and the depressions is perpendicular to the bending direction of the display panel.
7. The display panel according to claim 1, wherein a cross-section of the projection in a film lamination layer direction of the display panel is rectangular, triangular, or semicircular in shape.
8. The display panel according to claim 1, wherein the ratio of the refractive index of the support layer to the refractive index of the first optical adhesive layer is 0.8-1.2, and/or the ratio of the refractive index of the support layer to the refractive index of the second optical adhesive layer is 0.8-1.2.
9. The display panel according to claim 1, wherein the material of the support layer is a light-transmitting material.
10. The display panel according to claim 1, wherein the elastic modulus of the first optical adhesive layer and/or the second optical adhesive layer is smaller than the elastic modulus of the support layer.
11. The display panel according to claim 10, wherein the elastic modulus of the first optical adhesive layer and/or the second optical adhesive layer ranges from 20Kpa to 30Kpa; the elastic modulus of the supporting layer is in the range of 3Gpa to 6Gpa.
12. A display device comprising the display panel according to any one of claims 1 to 11.
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