CN114677918B - Flexible display panel and preparation method thereof - Google Patents
Flexible display panel and preparation method thereof Download PDFInfo
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- CN114677918B CN114677918B CN202210287525.2A CN202210287525A CN114677918B CN 114677918 B CN114677918 B CN 114677918B CN 202210287525 A CN202210287525 A CN 202210287525A CN 114677918 B CN114677918 B CN 114677918B
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- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 110
- 239000011241 protective layer Substances 0.000 claims abstract description 73
- 239000010410 layer Substances 0.000 claims abstract description 28
- 238000007641 inkjet printing Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000003491 array Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 40
- 239000012790 adhesive layer Substances 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 14
- 239000004973 liquid crystal related substance Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000003292 glue Substances 0.000 description 7
- 241001391944 Commicarpus scandens Species 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000009832 plasma treatment Methods 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
Abstract
The application provides a flexible display panel and a preparation method thereof, wherein the flexible display panel comprises a protective layer, a flexible substrate and a display layer which are arranged in a stacked manner, the flexible substrate comprises a first surface facing the protective layer, the protective layer comprises a second surface facing the flexible substrate, one of the first surface and the second surface is provided with a plurality of grooves, the other one is provided with a plurality of protrusions, and the grooves and the protrusions are mutually embedded and connected. According to the flexible display panel, the plurality of protrusions or the plurality of grooves are formed on the first surface of the flexible substrate, the second surface of the subsequent protective layer can be directly connected with the protrusions or the grooves in an embedded mode, the grooves or the protrusions enable the first surface to have larger roughness, so that the connection of the protrusions and the first surface is firmer, no additional adhesive layer is needed to be used for connection in the mode, the thickness is reduced, the bending performance is improved, and deformation of the flexible display panel after bending due to the recovery hysteresis of the adhesive layer is avoided.
Description
Technical Field
The application relates to the technical field of display, in particular to a flexible display panel and a preparation method thereof.
Background
The flexible display panel generally comprises flexible substrate and display layer, in order to avoid receiving unexpected damage at the in-process flexible substrate, often a protective layer is increased to one side that flexible substrate deviates from the display layer, current protective layer and flexible substrate mainly are connected through the mode of gluing the material, but because the existence of gluing the material, the total thickness of protective layer and gluing the material is too big, can make the condition of buckling of protective layer not ideal, in addition, has the strong hysteresis quality of recovering of viscoelastic gluing the material existence, leads to flexible display panel crooked deformation easily, influences flexible display effect and life.
Therefore, the existing flexible display panel has the technical problems of poor bending performance and easy deformation after bending, and needs to be improved.
Disclosure of Invention
The embodiment of the application provides a flexible display panel and a preparation method thereof, which are used for relieving the technical problems that the existing flexible display panel is poor in bending performance and easy to deform after bending.
The embodiment of the application provides a flexible display panel, which comprises a protective layer, a flexible substrate and a display layer which are arranged in a stacked manner, wherein the flexible substrate comprises a first surface facing the protective layer, the protective layer comprises a second surface facing the flexible substrate, one of the first surface and the second surface is provided with a plurality of grooves, the other one of the first surface and the second surface is provided with a plurality of protrusions, and the grooves and the protrusions are connected in an embedded manner.
In one embodiment, the flexible display panel includes a middle bending region, and first and second regions located at both sides of the middle bending region, and the plurality of grooves are disposed at a greater density in the middle bending region than in the first and second regions.
In one embodiment, the flexible display panel includes a middle inflection region and first and second regions located at both sides of the middle inflection region, and the plurality of grooves have a greater depth in the middle inflection region than in the first and second regions.
In one embodiment, the recess includes a bottom surface and an open surface, the width of the bottom surface being no less than the width of the open surface.
In one embodiment, the first surface is formed with a plurality of protrusions including a first protrusion and a second protrusion, the first protrusion being located at a middle region of the flexible display panel, the second protrusion being disposed around the middle region, and a height of the second protrusion being greater than a height of the first protrusion.
In one embodiment, the plurality of groove arrays are arranged, and two adjacent grooves are staggered.
In one embodiment, the plurality of grooves are spaced apart along a first direction, each groove extending along a second direction, the second direction being perpendicular to the first direction.
In one embodiment, the plurality of grooves are interconnected to form a network.
The application also provides a preparation method of the flexible display panel, which comprises the following steps:
preparing a flexible substrate;
preparing a display layer on the flexible substrate;
preparing a plurality of protrusions or a plurality of grooves on a first surface of the flexible substrate remote from the display layer;
and preparing a protective layer on the first surface, wherein the protective layer is embedded and connected with a plurality of protrusions or a plurality of grooves on the first surface towards the second surface of the flexible substrate.
In one embodiment, the step of preparing a protective layer on the first surface comprises: and preparing a protective layer on the first surface by an ink-jet printing mode.
The application also provides a display device which comprises a flexible display panel and a driving chip, wherein the flexible display panel is any one of the flexible display panels.
The beneficial effects are that: the application provides a flexible display panel and a preparation method thereof, wherein the flexible display panel comprises a protective layer, a flexible substrate and a display layer which are arranged in a stacked manner, the flexible substrate comprises a first surface facing the protective layer, the protective layer comprises a second surface facing the flexible substrate, one of the first surface and the second surface is provided with a plurality of grooves, the other one is provided with a plurality of protrusions, and the grooves and the protrusions are mutually embedded and connected. According to the flexible display panel, the first surface of the flexible substrate is preprocessed to form the plurality of bulges or the plurality of grooves, the second surface of the subsequent protective layer can be directly connected with the bulges or the grooves in an embedded mode, the grooves or the bulges enable the first surface to have larger roughness, so that the connection of the bulges or the grooves is firmer, an additional adhesive layer is not needed to be used for connection in the mode, the thickness is reduced, the bending performance is increased, and deformation of the flexible display panel after bending due to the recovery hysteresis of the adhesive layer is avoided.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a first film structure of a flexible display panel according to an embodiment of the application.
Fig. 2 is a schematic diagram of a second film structure of the flexible display panel according to an embodiment of the application.
Fig. 3 is a schematic diagram of a film structure of a flexible display panel in a bent state according to an embodiment of the application.
Fig. 4 is a schematic view illustrating an arrangement of protrusions in a flexible display panel according to an embodiment of the application.
Fig. 5 is a schematic diagram of a first arrangement of grooves in a flexible display panel according to an embodiment of the application.
Fig. 6 is a schematic diagram of a second arrangement of grooves in a flexible display panel according to an embodiment of the application.
Fig. 7 is a schematic flow chart of a method for manufacturing a flexible display panel according to an embodiment of the application.
Fig. 8 is a schematic diagram of a film structure at each stage in a method for manufacturing a flexible display panel according to an embodiment of the application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The embodiment of the application provides a flexible display panel and a preparation method thereof, which are used for relieving the technical problems that the existing flexible display panel is poor in bending performance and easy to deform after bending.
As shown in fig. 1 and 2, an embodiment of the present application provides a flexible display panel including a protective layer 30, a flexible substrate 10, and a display layer 20 stacked on top of each other, the flexible substrate 10 including a first surface facing the protective layer 30, the protective layer 30 including a second surface facing the flexible substrate 10, one of the first surface and the second surface being formed with a plurality of grooves 11, the other being formed with a plurality of protrusions 31, the plurality of grooves 11 and the plurality of protrusions 21 being embedded in each other.
The flexible display panel of the present application may be an OLED display panel as shown in fig. 1 or a liquid crystal display panel as shown in fig. 2. For an OLED display panel, the display layer 20 is an OLED light-emitting layer, and an encapsulation layer 40 is further disposed on a side of the display layer 20 away from the flexible substrate 10. For the liquid crystal display panel, in the direction away from the flexible substrate 10, the display layer 20 sequentially comprises a first substrate 21, a liquid crystal layer 24 and a second substrate 22, the first substrate 21 and the second substrate 22 are connected through a frame glue 23, when the liquid crystal display panel is a conventional display panel, the first substrate 21 is an array substrate, the second substrate 22 is a color film substrate, and when the liquid crystal display panel is a COA type display panel, the first substrate 21 is an array color film substrate.
The material of the flexible substrate 10 may be flexible material such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate or glass fiber reinforced plastic, which has no protection effect, so that the protective layer 30 is disposed on the first surface of the flexible substrate 10 away from the display layer 20, so as to avoid the flexible substrate 10 from being damaged by the outside during the bending process of the flexible display panel.
The first surface is formed with a plurality of grooves, and portions between adjacent grooves are regarded as projections, or the first surface is formed with a plurality of projections, and portions between adjacent projections are regarded as grooves. Since the projections and the grooves are relative concepts, the following embodiments will be described by taking the case where a plurality of grooves 11 are formed on the first surface as an example. The grooves or protrusions may be formed by an etching process or a plasma treatment method, and when the grooves or protrusions are formed, the roughness of the first surface is increased with respect to a smooth plane.
The protective layer 30 is formed on the first surface by means of ink-jet printing, the protective layer 30 is formed in its entirety after drying, the region of the groove 11 is formed on the first surface, the protective layer 30 fills the inside of the groove 11 to form the protrusion 31, the region of the protrusion is formed on the first surface, and the protective layer 30 forms the groove. After drying, the protrusions and grooves on the protective layer 30 together form a second surface of the protective layer 30, and the fixed connection of the protective layer 30 and the flexible substrate 11 is achieved by mutual embedding of the grooves 11 on the first surface and the protrusions 31 on the second surface.
In current flexible display panel, connect through the glue film between flexible substrate 10 and the protective layer 30, the existence of glue film makes flexible display panel overall thickness great, be unfavorable for buckling, and the glue film has stronger recovery hysteresis quality more, when also needing to resume plane state after flexible display panel buckles, the plane recovery process of glue film can lag for other retes, easily cause flexible display panel to buckle and warp, in addition, when adopting the glue film to connect, each rete is planar structure, then when flexible display panel takes place to buckle, protective layer 30 and flexible substrate 10 also can appear breaking off easily, these factors all can influence flexible display panel's display effect and life.
In the embodiment of the application, the first surface of the flexible substrate is preprocessed to form a plurality of bulges or a plurality of grooves, the second surface of the subsequent protective layer can be directly embedded and connected with the bulges or the grooves, and the grooves or the bulges enable the first surface roughness to be larger, so that the connection of the first surface roughness and the second surface roughness is firmer, breakage and falling off are not easy to occur during bending, and an additional adhesive layer is not needed for connection in the mode, so that the thickness is reduced, the bending performance is increased, and deformation of the flexible display panel after bending due to the recovery hysteresis of the adhesive layer is avoided.
In one embodiment, the flexible display panel includes a middle inflection region 100 and first and second regions 200 and 300 located at both sides of the middle inflection region 100, and the plurality of grooves 11 are disposed at a greater density in the middle inflection region 100 than in the first and second regions 200 and 300. The flexible display panel may be a half-folded display panel (folded display panel) or a full-folded display panel (curved screen display panel), and when the flexible display panel is a half-folded display panel, the bending state is as shown in fig. 3, the first region 200 and the second region 300 are planar regions, the flexible substrate 10 and the protective layer 30 are not bent in the first region 200 and the second region 300, and are folded in the middle folding region 100, so that the middle folding region 100 has a high requirement for folding the flexible substrate 10. When the flexible display panel is a fully folded display panel, the first region 200 and the second region 300 are also folded regions, but the folding requirement of the middle folded region 100 on the flexible substrate 10 is higher than the folding requirement of the first region 200 and the second region 300 on both sides. When the arrangement density of the plurality of grooves 11 in the middle bending region 100 is greater than that in the first region 200 and the second region 300, the flexibility of the flexible substrate 10 in the middle bending region 100 can be made to be greater, bending is easier, the contact area between the flexible substrate 10 and the protective layer 30 in the middle bending region 100 is larger, the connection force is larger, and the flexible substrate 10 and the protective layer 30 are not easy to break and fall off.
In one embodiment, the plurality of grooves 11 have a greater depth in the middle inflection region 100 than in the first region 200 and the second region 300. When the depth of the groove 11 is larger, on one hand, the contact area between the flexible substrate 10 and the protective layer 30 is larger, the connection force between the two is larger, the flexible substrate 10 is not easy to break and fall off, and on the other hand, the film thickness of the rest part of the flexible substrate 10 below the groove 11 is smaller, the flexibility of the flexible substrate 10 in the middle bending region 100 is larger, and the bending is easier.
In one embodiment, the recess 11 includes a bottom surface and an opening surface, and the width of the bottom surface is not smaller than the width of the opening surface. The longitudinal section of the groove 11 forms a rectangular or inverted trapezoid structure, the width of the bottom surface is larger than or equal to that of the opening surface, when the protective layer 30 is filled in the groove 11, the contact area with the bottom surface of the groove 11 is larger, and the connecting force between the flexible substrate 20 and the protective layer 30 is further improved, so that the flexible substrate 20 and the protective layer 30 are not easy to break and fall off. The longitudinal cross-sectional shape of the groove 11 is a shape of the flexible display panel in an unbent state.
In one embodiment, as shown in fig. 4, the first surface of the flexible substrate 10 is formed with a plurality of protrusions including a first protrusion 301 and a second protrusion 302, the first protrusion 301 being located at the middle region 101 of the flexible display panel, the second protrusion 302 being disposed around the middle region, the second protrusion 302 having a height greater than that of the first protrusion 101. Since the protective layer 30 is formed on the first surface by the inkjet printing method, in order to avoid the ink overflowing around before drying, a whole circle of the second protrusions 302 may be provided, and the height of the second protrusions 302 is set to be greater than that of the first protrusions 301 in the middle region 101, so that the second protrusions 302 may act as barriers to limit the ink on the first surface, so as to ensure the preparation quality of the protective layer 30.
In one embodiment, as shown in fig. 5, a plurality of grooves 11 are arranged in an array, and two adjacent grooves 11 are staggered. The array arrangement is such that the flexible substrate 10 has embedded connection points with the protective layer 30 in the whole area, and the staggered arrangement is more uniform for the distribution of the embedded connection points with respect to the regular arrangement, so that the connection effect is also better.
In one embodiment, as shown in fig. 6, a plurality of grooves 11 are arranged at intervals along a first direction, each groove 11 extends along a second direction, and the depth of each groove 11 is not completely equal everywhere, the second direction is perpendicular to the first direction. In fig. 6, the first direction is the transverse direction and the second direction is the longitudinal direction, but the first direction may be the longitudinal direction and the second direction may be the transverse direction. In this embodiment, the grooves 11 are distributed in a strip structure, and the whole strip structure can also enable the flexible substrate 10 to be uniformly embedded and connected with the protective layer 30 in the whole area, and since the depth of each part inside each groove 11 is not completely equal, that is, the depth in the same groove 11 has a level difference, the ink has certain fluidity in the groove 11 due to the level difference, so that defects of air holes and the like caused by insufficient fusion and the like of printed ink drops are avoided, and the connection weak point is caused, thereby improving the connection performance.
In one embodiment, the plurality of grooves 11 are interconnected to form a network. The mesh structure is arranged in such a way that the flexible substrate 10 is uniformly embedded and connected with the protective layer 30 in the whole area, and the connectivity is good. In addition, each groove 11 can also form a ring structure, and can also play a role in uniformly embedding connection.
As shown in fig. 7, the present application further provides a method for preparing a flexible display panel, which specifically includes the steps of:
s1: a flexible substrate is prepared.
As shown in a of fig. 8, in preparing the flexible substrate 10, the flexible substrate 10 needs to be deposited on the rigid substrate 50, and the rigid substrate 50 may be a glass substrate.
S2: a display layer is prepared on a flexible substrate.
As shown in a in fig. 8, a display layer 20 is prepared on a flexible substrate 10, when the flexible display panel is a liquid crystal display panel, the display layer 20 sequentially includes a first substrate 21, a liquid crystal layer 24 and a second substrate 22 in a direction away from the flexible substrate 10, the first substrate 21 and the second substrate 22 are connected by a frame glue 23, when the liquid crystal display panel is a conventional display panel, the first substrate 21 is an array substrate, the second substrate 22 is a color film substrate, and when the liquid crystal display panel is a COA type display panel, the first substrate 21 is an array color film substrate. When the flexible display panel is an OLED display panel, the display layer 20 is an OLED light-emitting layer, and the encapsulation layer 40 is further prepared after the display layer 20 is prepared.
S3: a plurality of protrusions or a plurality of grooves are prepared on a first surface of the flexible substrate remote from the display layer.
As shown in b of fig. 8, the surfaces of the flexible substrate 10 and the rigid substrate 10 are irradiated with laser light from the back surface of the flexible substrate 10, the flexible substrate 10 is peeled from the rigid substrate 10 to expose the first surface of the flexible substrate 10, and then a plurality of protrusions or a plurality of grooves 11 are formed on the first surface of the flexible substrate 10 by an etching process or a plasma treatment process.
S4: and preparing a protective layer on the first surface, wherein the protective layer is embedded and connected with a plurality of protrusions or a plurality of grooves on the first surface towards the second surface of the flexible substrate.
As shown in c of fig. 8, the protective layer 30 is prepared on the first surface, and since the grooves 11 or the protrusions are formed on the first surface, a part of the protective layer 30 is formed on the protrusions, and a part of the protective layer is filled in the grooves 11 to form the protrusions 31, and finally the second surface facing the flexible substrate 10 is connected with the plurality of protrusions or the plurality of grooves 11 on the first surface in an embedded manner. In one embodiment, the protective layer 30 is integrally formed on the first surface by ink-jet printing, and the protective layer 30 is formed after drying.
In the preparation method of the flexible display device provided by the embodiment of the application, the first surface of the flexible substrate is preprocessed to form a plurality of bulges or a plurality of grooves, the second surface of the subsequent protective layer can be directly embedded and connected with the bulges or the grooves, the grooves or the bulges enable the first surface to have larger roughness, so that the connection of the bulges and the bulges is firmer, breakage and falling off are not easy to occur during bending, and in such a way, no additional adhesive layer is needed for connection, so that the thickness is reduced, the bending performance of the whole flexible display panel is increased, and the deformation of the flexible display panel after bending due to the recovery hysteresis of the adhesive layer is avoided.
In one embodiment, as shown in fig. 1 and 3, the flexible display panel includes a middle bending region 100 and first and second regions 200 and 300 located at both sides of the middle bending region 100, and S3 specifically includes: a plurality of grooves 11 are prepared on the first surface, and the arrangement density of the plurality of grooves 11 in the middle inflection region 100 is greater than the arrangement density in the first region 200 and the second region 300. Because the bending requirement of the middle bending region 100 on the flexible substrate 10 is higher than the bending requirement of the first region 200 and the second region 300 on the two sides, when the arrangement density of the plurality of grooves 11 in the middle bending region 100 is greater than the arrangement density of the first region 200 and the second region 300, the flexibility of the flexible substrate 10 in the middle bending region 100 can be greater, the bending is easier, the contact area between the flexible substrate 10 and the protective layer 30 in the middle bending region 100 is larger, the connecting force is larger, and the two are not easy to break and fall off.
In one embodiment, S3 specifically further includes: a plurality of grooves 11 are prepared on the first surface, the plurality of grooves 11 having a greater depth in the middle inflection region 100 than in the first region 200 and the second region 300. When the depth of the groove 11 is larger, on one hand, the contact area between the flexible substrate 10 and the protective layer 30 is larger, the connection force between the two is larger, the flexible substrate 10 is not easy to break and fall off, and on the other hand, the film thickness of the rest part of the flexible substrate 10 below the groove 11 is smaller, the flexibility of the flexible substrate 10 in the middle bending region 100 is larger, and the bending is easier.
In one embodiment, S3 specifically includes: a plurality of grooves 11 are prepared on the first surface, the grooves 11 including a bottom surface and an opening surface, the width of the bottom surface being not smaller than the width of the opening surface. The longitudinal section of the groove 11 forms a rectangular or inverted trapezoid structure, the width of the bottom surface is larger than or equal to that of the opening surface, when the protective layer 30 is filled in the groove 11, the contact area with the bottom surface of the groove 11 is larger, and the connecting force between the flexible substrate 20 and the protective layer 30 is further improved, so that the flexible substrate 20 and the protective layer 30 are not easy to break and fall off. The longitudinal cross-sectional shape of the groove 11 is a shape of the flexible display panel in an unbent state.
In one embodiment, as shown in fig. 4, S3 specifically includes: a plurality of protrusions including a first protrusion 301 and a second protrusion 302 are prepared on the first surface, the first protrusion 301 being disposed at the middle region 101 of the flexible display panel, the second protrusion 302 being disposed around the middle region, the second protrusion 302 having a height greater than that of the first protrusion 101. Since the protective layer 30 is formed on the first surface by the inkjet printing method, in order to avoid the ink overflowing around before drying, a whole circle of the second protrusions 302 may be provided, and the height of the second protrusions 302 is set to be greater than that of the first protrusions 301 in the middle region 101, so that the second protrusions 302 may act as barriers to limit the ink on the first surface, so as to ensure the preparation quality of the protective layer 30.
In one embodiment, as shown in fig. 5, S3 specifically includes: a plurality of grooves 11 are prepared on the first surface, the plurality of grooves 11 are arranged in an array, and two adjacent grooves 11 are arranged in a staggered manner. The array arrangement is such that the flexible substrate 10 has embedded connection points with the protective layer 30 in the whole area, and the staggered arrangement is more uniform for the distribution of the embedded connection points with respect to the regular arrangement, so that the connection effect is also better.
In one embodiment, as shown in fig. 6, S3 specifically includes: a plurality of grooves 11 are prepared on the first surface, the plurality of grooves 11 are arranged at intervals along a first direction, each groove 11 extends along a second direction, the depth of each groove 11 is not completely equal, and the second direction is perpendicular to the first direction. In fig. 6, the first direction is the transverse direction and the second direction is the longitudinal direction, but the first direction may be the longitudinal direction and the second direction may be the transverse direction. In this embodiment, the grooves 11 are distributed in a strip structure, and the whole strip structure can also enable the flexible substrate 10 to be uniformly embedded and connected with the protective layer 30 in the whole area, and since the depth of each part inside each groove 11 is not completely equal, that is, the depth in the same groove 11 has a level difference, the ink has certain fluidity in the groove 11 due to the level difference, so that defects of air holes and the like caused by insufficient fusion and the like of printed ink drops are avoided, and the connection weak point is caused, thereby improving the connection performance.
In one embodiment, S3 specifically includes: a plurality of grooves 11 are prepared on the first surface, and the plurality of grooves 11 are connected to each other to form a net structure. The mesh structure is arranged in such a way that the flexible substrate 10 is uniformly embedded and connected with the protective layer 30 in the whole area, and the connectivity is good. In addition, each groove 11 can also form a ring structure, and can also play a role in uniformly embedding connection.
As can be seen from the above embodiments:
the application provides a flexible display panel and a preparation method thereof, wherein the flexible display panel comprises a protective layer, a flexible substrate and a display layer which are arranged in a stacked manner, the flexible substrate comprises a first surface facing the protective layer, the protective layer comprises a second surface facing the flexible substrate, one of the first surface and the second surface is provided with a plurality of grooves, the other one is provided with a plurality of protrusions, and the grooves and the protrusions are mutually embedded and connected. According to the flexible display panel, the first surface of the flexible substrate is preprocessed to form the plurality of bulges or the plurality of grooves, the second surface of the subsequent protective layer can be directly connected with the bulges or the grooves in an embedded mode, the grooves or the bulges enable the first surface to have larger roughness, so that the connection of the bulges or the grooves is firmer, an additional adhesive layer is not needed to be used for connection in the mode, the thickness is reduced, the bending performance is increased, and deformation of the flexible display panel after bending due to the recovery hysteresis of the adhesive layer is avoided.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above describes in detail a flexible display panel and a method for manufacturing the same provided by the embodiment of the present application, and specific examples are applied to illustrate the principle and implementation of the present application, and the description of the above embodiment is only used to help understand the technical solution and core idea of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (8)
1. A flexible display panel, comprising a protective layer, a flexible substrate and a display layer which are stacked, wherein the flexible substrate comprises a first surface facing the protective layer, the protective layer comprises a second surface facing the flexible substrate, a plurality of bulges are formed on the first surface, a plurality of grooves are formed on the second surface, and the grooves and the bulges are mutually embedded and connected; the protective layer is prepared on the first surface in an ink-jet printing mode, the plurality of protrusions comprise first protrusions and second protrusions, the first protrusions are located in the middle area of the flexible display panel, the second protrusions are arranged around the middle area, and the height of the second protrusions is larger than that of the first protrusions.
2. The flexible display panel of claim 1, wherein the flexible display panel includes a middle inflection region and first and second regions located on opposite sides of the middle inflection region, the plurality of grooves being disposed at a greater density in the middle inflection region than in the first and second regions.
3. The flexible display panel of claim 1, wherein the flexible display panel includes a middle inflection region and first and second regions located on opposite sides of the middle inflection region, the plurality of grooves having a greater depth in the middle inflection region than in the first and second regions.
4. The flexible display panel of claim 1, wherein the recess includes a bottom surface and an open surface, the width of the bottom surface being no less than the width of the open surface.
5. The flexible display panel of claim 1, wherein the plurality of groove arrays are disposed with adjacent two grooves staggered.
6. The flexible display panel of claim 1, wherein the plurality of grooves are spaced apart along a first direction, each groove extends along a second direction, and the depth of each groove is not exactly equal throughout the interior of each groove, the second direction being perpendicular to the first direction.
7. The flexible display panel of claim 1, wherein the plurality of grooves are interconnected to form a mesh structure.
8. A method of manufacturing a flexible display panel, comprising:
preparing a flexible substrate;
preparing a display layer on the flexible substrate;
preparing a plurality of protrusions on a first surface of the flexible substrate away from the display layer, the plurality of protrusions including a first protrusion and a second protrusion, the first protrusion being located at a middle region of the flexible display panel, the second protrusion being disposed around the middle region, a height of the second protrusion being greater than a height of the first protrusion;
and preparing a protective layer on the first surface in an ink-jet printing mode, wherein the protective layer faces to the second surface of the flexible substrate and is connected with a plurality of protrusions on the first surface in an embedded mode.
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| CN115331548A (en) * | 2022-07-21 | 2022-11-11 | 武汉天马微电子有限公司 | Display module, manufacturing method thereof and display device |
| CN115447239A (en) * | 2022-09-26 | 2022-12-09 | 昆山国显光电有限公司 | Flexible multi-film-layer structure, preparation method thereof and display module |
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