CN110047881B - Display panel and manufacturing method thereof - Google Patents
Display panel and manufacturing method thereof Download PDFInfo
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- CN110047881B CN110047881B CN201910246835.8A CN201910246835A CN110047881B CN 110047881 B CN110047881 B CN 110047881B CN 201910246835 A CN201910246835 A CN 201910246835A CN 110047881 B CN110047881 B CN 110047881B
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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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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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Abstract
The invention provides a display panel and a manufacturing method of the display panel. The display panel is defined with a bending area and a non-bending area, and the display panel sequentially comprises a substrate layer, an array layer and a light-emitting layer from bottom to top, wherein a first groove is formed in one side, far away from the array layer, of the substrate layer in the bending area. The manufacturing method of the display panel comprises the following steps: a step of manufacturing a substrate layer, a step of etching the substrate layer and a step of finishing manufacturing the display panel. The invention can enhance the stability of the bending angle of the bending area and avoid the generation of cracks or fractures due to overlarge local stress caused by the deformation of the bending area.
Description
Technical Field
The invention relates to the field of display, in particular to a display panel and a manufacturing method of the display panel.
Background
Compared with other conventional display technologies, the Active Matrix Organic Light Emitting Diode (AMOLED) display technology has a series of advantages such as thinness, high contrast, low response time, high color saturation, and the like, wherein the flexible characteristic is one of the most prominent advantages.
As shown in fig. 1, a typical AMOLED display panel structure in the prior art employs a segmented passivation film structure for actually generating the middle bending region. The display panel comprises a protective film layer (generally a back plate) 1, a flexible substrate layer 2 and an array layer 3 from bottom to top in sequence. The display panel is defined with a bending area 10 and a non-bending area 20, in order to facilitate bending, the protective film layer 1 of the bending area 10 is peeled off, the flexible substrate layer 2 and the array layer 3 are reserved, the bending area 10 is made thinner, and therefore the first protective film layer 11 and the second protective film layer 12 are also formed respectively.
As shown in fig. 2, a structure in which the bending region is thinned by using a segmented protection film and a substrate is actually produced, that is, a groove 21 is formed by peeling off a portion of the flexible substrate layer 2 corresponding to the peeling off of the protection film layer 1 of the bending region 10 on the basis of the structure of fig. 1.
As shown in fig. 3, the bending angle in the ideal state formed after bending in fig. 2 is determined by the actual requirement by bending in the bending area 3, and the bending angle is generally made to be symmetrical and smooth. Specifically, the display panel further includes a light emitting layer 4 and a film encapsulation layer 5 on the array layer 3 as shown in fig. 3, and displays a picture toward the film encapsulation layer 5.
The above method plays a role in reducing stress, but is not favorable for maintaining a bending angle (R angle), and has low performance of preventing external stress interference. In fact, due to the influence of insufficient bending process capability, external interference, etc., the bending angle is not ideal, and the bending angle is deformed inward or deviated to one side, thereby causing cracks or fractures.
Disclosure of Invention
The present invention is directed to a display panel and a method for manufacturing the display panel, which can enhance the stability of a bending angle of a bending region and avoid cracks or fractures due to excessive local stress caused by deformation of the bending region.
In order to solve the above problem, an embodiment of the present invention provides a display panel, which defines a bending region and a non-bending region, and the display panel sequentially includes a substrate layer, an array layer, and a light emitting layer from bottom to top, where a first groove is disposed on a side of the substrate layer located in the bending region, the side being far away from the array layer.
Further, the substrate layer comprises a flexible substrate layer, and the first groove is concavely arranged on the flexible substrate layer.
Further, the width L of the first groove is L ═ pi × H ÷ n, where H is the depth of the first groove, and n is the number of the first grooves.
Further, the display panel includes at least two first grooves, and a distance S between two adjacent first grooves is S ═ pi × (R1-H) ÷ n, where R1 is a radius from a center of a circle to a bottom of the first groove after the bending region is bent, H is a depth of the first groove, and n is the number of the first grooves.
Further, the substrate layer comprises a protective film layer, and the first groove penetrates through the protective film layer.
Further, the material of the flexible substrate layer is polyimide.
Furthermore, second grooves are formed in the substrate layer of the bending area and are distributed at equal intervals, and the extending direction of the second grooves is perpendicular to the extending direction of the first grooves.
In another embodiment of the present invention, a method for manufacturing a display panel includes:
a substrate layer manufacturing step, wherein a polyimide solution is coated, a film layer is solidified to form a flexible substrate layer, and the flexible substrate layer forms a substrate layer;
etching a substrate layer, wherein first grooves are formed in the substrate layer, and the first grooves are distributed at equal intervals; cleaning the stripping residues in the first groove;
finishing a display panel manufacturing step, namely sequentially laminating an array layer and a light emitting layer on one side of the flexible substrate layer, which is far away from the first groove; and bending the flexible substrate layer towards one side of the first groove, wherein the first groove region is defined as a bending region, and the light-emitting layer region is defined as a non-bending region.
Further, the step of manufacturing the substrate layer further comprises a step of manufacturing a protective film layer, wherein the protective film layer is manufactured on one side of the flexible substrate layer, the protective film layer is etched by utilizing a mask plate and laser irradiation, the mask plate is in a fence shape and is provided with a shading area and a light transmitting area which are distributed at equal intervals, the width L of the shading area is L ═ pi × H ÷ n, wherein H is the depth of the first groove, and n is the number of the first grooves; and forming a first groove on the etched protective film layer, wherein the first groove penetrates through the protective film layer.
Further, the etching of the substrate layer further comprises a step of etching the protective film layer in a crossing manner, wherein second grooves are formed in the substrate layer in an etching manner and distributed at equal intervals, and the extending direction of the second grooves is perpendicular to the extending direction of the first grooves.
The invention has the advantages that the display panel and the manufacturing method of the display panel are provided, the stability of the bending angle of the bending area can be enhanced, and cracks or fractures caused by overlarge local stress due to deformation of the bending area are avoided.
Drawings
FIG. 1 is a schematic diagram of a display panel according to the prior art;
FIG. 2 is a schematic structural diagram of the substrate of FIG. 1 after thinning;
FIG. 3 is a schematic view of the structure of FIG. 2 after bending;
FIG. 4 is a schematic view of a display panel according to a first embodiment of the present invention;
FIG. 5 is a top view of the kink zone structure of FIG. 4 according to the present invention;
FIG. 6 is a cross-sectional view of the kink zone structure of FIG. 4 according to the present invention;
FIG. 7 is a schematic view of a display panel according to a second embodiment of the present invention;
FIG. 8 is a top view of the kink zone structure of FIG. 7 according to the present invention;
FIG. 9 is a cross-sectional view of the kink zone structure of FIG. 7 according to the present invention;
FIG. 10 is a schematic view of a display panel according to a third embodiment of the present invention;
FIG. 11 is a cross-sectional view of the kink zone configuration of FIG. 10 according to the present invention;
FIG. 12 is a top view of a bending region structure of a display panel according to a fourth embodiment of the present invention;
FIG. 13 is a flowchart illustrating a manufacturing process of a display panel according to a first embodiment of the present invention;
fig. 14 is a flowchart illustrating a manufacturing process of a display panel according to the second embodiment or the third embodiment of the present invention;
fig. 15 is a flowchart illustrating a manufacturing process of a display panel according to a fourth embodiment of the present invention.
The components in the figure are identified as follows:
1. a protective film layer 2, a flexible substrate layer 3, an array layer 4, a luminescent layer,
5. a film packaging layer, 6, a substrate layer, 10, a bending area, 20, a non-bending area,
11. a first protective film layer 12, a second protective film layer 21, a groove,
61. a first recess, 62, a second recess.
Detailed Description
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. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Further, it should also be noted that in some alternative implementations, the steps of all methods described herein may occur out of order. For example, two steps shown in succession may, in fact, be executed substantially concurrently, or the steps may sometimes be executed in the reverse order.
Referring to fig. 4 to 12, an embodiment of the present invention provides a display panel, which defines a bending region 10 and a non-bending region 20, and the display panel sequentially includes a substrate layer 6, an array layer 3, and a light emitting layer 4 from bottom to top, wherein a first groove 61 is disposed on a side of the substrate layer 6, which is located in the bending region 10 and is far away from the array layer 3.
Fig. 4 is a schematic diagram of a display panel according to an embodiment of the present invention. The substrate layer 6 comprises a flexible substrate layer 2, and the first groove 61 is concavely arranged on the flexible substrate layer 2. The material of the flexible substrate layer 2 is preferably polyimide.
Fig. 5 is a top view of a bending region structure in a display panel according to an embodiment. The width of the first groove 61 is L, the substrate layer 6 is divided into a plurality of unit blocks, that is, the distance between the unit blocks of the adjacent substrate layer 6, the width L of the first groove 61 is L ═ pi × H ÷ n, where H is the depth of the first groove, and n is the number of the first grooves.
Specifically, as shown in fig. 4, R1 is a radius from a center of a bent area to a bottom of a first groove, Rl is a desired design value after bending, R2 is an equivalent radius of a circle formed by unit blocks of an adjacent substrate layer 6 after bending of the bent area, and H is a depth of the first groove, so R2 is approximately calculated as R1-H (formula 1); if n grooves are designed in the bending region, n-1 unit blocks of the substrate layer 6 exist, the width of the first groove is L, and the width of the unit block of the substrate layer 6 is S, n × L + (n-1) × S ═ P × Rl (formula 2) needs to be satisfied; when n is large, formula 2 is nearly n × (L + S) ═ pi × Rl (formula 3); if the substrate layer 6 forms an inner circle after the bending region is bent, and the adjacent units quickly form a support structure, the requirement that θ ═ S + L)/2 π Rl × 360 ° -S/2 π R2 × 360 °, after simplification, S × (R1-R2) ═ L × R2, is satisfied, and the result is obtained by substituting equation 1: sxh ═ lxr 2 (formula 4); substituting equation 4 into equation 3 yields: s ═ pi × (Rl-H)/n, L ═ pi × H/n.
Fig. 6 is a cross-sectional view of a bending region structure in a display panel according to an embodiment of the disclosure. The display panel comprises at least two first grooves 61, the distance S between every two adjacent first grooves 61 is S ═ pi × (R1-H) ÷ n, wherein R1 is the radius from the center of a circle to the bottom of each first groove after the bending area is bent, H is the depth of each first groove, and n is the number of the first grooves. The interval distance between two adjacent first grooves 61 is the width S of the substrate layer 6 in the bending region 10.
Fig. 7 shows a display panel according to a second embodiment of the present invention. The substrate layer 6 further includes a protection film layer 1 located below the flexible substrate layer 2, and at this time, the first groove 61 extends to the protection film layer 1, that is, the first groove 61 penetrates through the protection film layer 1. In the present embodiment, the protective film layer 1 is preferably a back sheet.
Fig. 8 is a top view of a bending region structure in a display panel according to a second embodiment. The width L of the first groove 61 is L ═ pi × H ÷ n, where H is the depth of the first groove, and n is the number of first grooves, i.e., the distance between adjacent substrate layers 6.
Fig. 9 is a cross-sectional view of a bending region structure in a display panel according to a second embodiment. The display panel comprises at least two first grooves 61, the distance S between every two adjacent first grooves 61 is S ═ pi × (R1-H) ÷ n, wherein R1 is the radius from the center of a circle to the bottom of each first groove after the bending area is bent, H is the depth of each first groove, and n is the number of the first grooves. The interval distance between two adjacent first grooves 61 is the width S of the substrate layer 6 in the bending region 10.
Referring to fig. 10, a display panel according to a third embodiment of the present invention is different from the display panel according to the second embodiment of the present invention in that the flexible substrate layer 2 includes the first groove 61. Namely, the first groove 61 penetrates through the protective film layer 1 and is located on the flexible substrate layer 2. The depth H of the first groove 61 is the sum of the thickness of the protective film layer 1 and the groove depth on the flexible substrate layer 2.
Fig. 11 is a cross-sectional view of a bending region structure in a display panel according to a third embodiment, which is a thinned substrate layer 6. The display panel comprises at least two first grooves 61, the distance S between every two adjacent first grooves 61 is S ═ pi × (R1-H) ÷ n, wherein R1 is the radius from the center of a circle to the bottom of each first groove after the bending area is bent, H is the depth of each first groove, and n is the number of the first grooves. The interval distance between two adjacent first grooves 61 is the width S of the substrate layer 6 in the bending region 10.
Please refer to fig. 12, which is a top view of a bending region structure of a display panel according to a fourth embodiment of the present invention, including all the above technical solutions, the difference is that second grooves 62 are further disposed on the substrate layer 6 of the bending region 10 at equal intervals, and an extending direction of the second grooves 62 is perpendicular to an extending direction of the first grooves 61. Preferably, the depth of the second groove 62 is the same as the depth of the first groove 61, and the two grooves differ only in the direction of extension.
Referring to fig. 13, in another embodiment of the present invention, a method for manufacturing a display panel includes the steps of:
s1, manufacturing a substrate layer, namely coating a polyimide solution, curing the film layer to form a flexible substrate layer 2, wherein the flexible substrate layer 2 forms a substrate layer 6;
s2, etching the substrate layer, wherein first grooves 61 are formed for etching the substrate layer 6, and the first grooves 61 are distributed at equal intervals; cleaning the stripping residue in the first groove 61;
s3, completing the manufacturing step of the display panel, namely sequentially laminating and manufacturing the array layer 3 and the light-emitting layer 4 on the side, far away from the first groove 61, of the flexible substrate layer 2; and bending the flexible substrate layer 2 towards one side of the first groove 61, defining that the area comprising the first groove 61 is a bending area 10, and defining that the area comprising the light-emitting layer 4 is a non-bending area 20.
As shown in fig. 14, the step of S1 fabricating the substrate layer further includes a step of S11 fabricating a protective film layer, in which a protective film layer 1 is fabricated on one side of the flexible substrate layer 2, and the protective film layer 1 is etched by using a mask plate and laser irradiation, the mask plate is in a fence shape and is provided with a light-shielding region and a light-transmitting region which are equidistantly distributed at intervals, the light-shielding region has a width of L, where L is pi × H ÷ n, where H is a depth of the first groove, and n is the number of the first grooves; the etched protective film layer 1 forms a first groove 61, and the first groove 61 penetrates through the protective film layer 1. Wherein the first groove 61 can also etch the flexible substrate layer 2, i.e. the etching depth of the first groove 61 can be different to form two different structures.
Referring to fig. 15, the step of etching the substrate layer by S2 further includes a step of etching the protective film layer by S21, in which the substrate layer 6 is etched to form second grooves 62 that are equidistantly spaced apart, and an extending direction of the second grooves 62 is perpendicular to an extending direction of the first grooves 61.
The invention has the advantages that the display panel and the manufacturing method of the display panel are provided, the stability of the bending angle of the bending area can be enhanced, and cracks or fractures caused by overlarge local stress due to deformation of the bending area are avoided. The display panel may be used in a single-sided display or a double-sided display device.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A display panel is defined with a bending area and a non-bending area, and the display panel sequentially comprises a substrate layer, an array layer and a light-emitting layer from bottom to top;
the substrate layer comprises a flexible substrate layer and a protective film layer, and the first groove penetrates through the protective film layer; the groove bottom of the first groove is flush with the surface of one side, facing the protective film layer, of the flexible substrate layer; or the groove bottom of the first groove extends into the flexible substrate layer;
the width L of the first groove is L ═ pi × H ÷ n, wherein H is the depth of the first groove, and n is the number of the first grooves.
2. The display panel according to claim 1, comprising at least two first grooves, wherein a distance S between two adjacent first grooves is S ═ pi × (R1-H) ÷ n, where R1 is a radius from a center of a bent region to a bottom of the first groove, H is a depth of the first groove, and n is a number of the first grooves.
3. The display panel according to claim 1, wherein the material of the flexible substrate layer is polyimide.
4. The display panel according to any one of claims 1 to 3, wherein second grooves are disposed on the substrate layer in the bending region at equal intervals, and the second grooves extend in a direction perpendicular to the first grooves.
5. A method of manufacturing a display panel according to any one of claims 1 to 4, comprising the steps of:
a substrate layer manufacturing step, namely coating a polyimide solution, curing a film layer to form a flexible substrate layer, manufacturing a protective film layer on one side of the flexible substrate layer, and forming the substrate layer by the flexible substrate layer and the protective film layer;
etching a substrate layer to form first grooves, wherein the first grooves are distributed at equal intervals and penetrate through the protective film layer; the groove bottom of the first groove is flush with the surface of one side, facing the protective film layer, of the flexible substrate layer; or the groove bottom of the first groove extends into the flexible substrate layer, and the stripping residues in the first groove are cleaned;
finishing a display panel manufacturing step, namely sequentially laminating an array layer and a light emitting layer on one side of the flexible substrate layer, which is far away from the first groove; and bending the flexible substrate layer towards one side of the first groove, wherein the first groove region is defined as a bending region, and the light-emitting layer region is defined as a non-bending region.
6. The method for manufacturing a display panel according to claim 5, wherein the etching the substrate layer step comprises:
etching the protective film layer by utilizing a mask plate and laser irradiation, wherein the mask plate is in a fence shape and is provided with a shading area and a light transmitting area which are distributed at equal intervals, the width of the shading area is L, and L is pi multiplied by H divided by n, wherein H is the depth of the first groove, and n is the number of the first grooves; and forming a first groove on the etched protective film layer, wherein the first groove penetrates through the protective film layer.
7. The method according to claim 5 or 6, wherein the etching the substrate layer further comprises etching the protective film layer to form second grooves at equal intervals, and the second grooves extend in a direction perpendicular to the first grooves.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910246835.8A CN110047881B (en) | 2019-03-29 | 2019-03-29 | Display panel and manufacturing method thereof |
| PCT/CN2019/086220 WO2020199306A1 (en) | 2019-03-29 | 2019-05-09 | Display panel and display panel fabrication method |
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| CN201910246835.8A CN110047881B (en) | 2019-03-29 | 2019-03-29 | Display panel and manufacturing method thereof |
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| CN110047881B true CN110047881B (en) | 2021-03-16 |
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| CN109411623A (en) * | 2018-09-30 | 2019-03-01 | 云谷（固安）科技有限公司 | A kind of display panel |
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| CN110047881A (en) | 2019-07-23 |
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