CN115294873A - Foldable display panel and method of manufacturing the same - Google Patents
Foldable display panel and method of manufacturing the same Download PDFInfo
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- CN115294873A CN115294873A CN202211035201.6A CN202211035201A CN115294873A CN 115294873 A CN115294873 A CN 115294873A CN 202211035201 A CN202211035201 A CN 202211035201A CN 115294873 A CN115294873 A CN 115294873A
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- 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
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- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
- G09F9/335—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes being organic light emitting diodes [OLED]
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Abstract
The present invention provides a foldable display panel and a method of manufacturing the same, the foldable display panel including: the flexible display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged, wherein the foldable display area extends along a first direction; the flexible cover plate is arranged on the flexible display substrate; and a colloid layer disposed between the flexible display substrate and the flexible cover plate and configured to bond the flexible display substrate and the flexible cover plate, wherein the colloid layer includes a first colloid layer and a second colloid layer alternately disposed along a second direction, the first colloid layer and the second colloid layer extend along a third direction, the third direction is substantially perpendicular to the second direction, the first colloid layer and the second colloid layer are disposed at least within the foldable display area, elastic moduli of the first colloid layer and the second colloid layer are different, and an included angle θ between the first direction and the third direction satisfies 0 ° ≦ θ ≦ 45 °.
Description
Technical Field
The invention relates to the technical field of display, in particular to a foldable display panel and a manufacturing method thereof.
Background
With the development of technology, flexible display devices, especially foldable display devices, have been increasingly used in recent years, and are implemented, for example, by using a 0LED (organic light emitting diode) display panel, which is self-luminous, unlike a TFT-LCD (thin film transistor liquid crystal display) that requires a backlight, has a wide viewing angle, high color saturation, low driving voltage and low power consumption, and is fast in response, light in weight, and thin in thickness, and is considered to be one of the most promising products.
Disclosure of Invention
An object of the present invention is to provide a foldable display panel including:
the flexible display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged, wherein the foldable display area extends along a first direction;
the flexible cover plate is arranged on the flexible display substrate; and
a glue layer disposed between the flexible display substrate and the flexible cover sheet configured to bond the flexible display substrate and the flexible cover sheet,
wherein the glue layer comprises a first glue layer and a second glue layer which are alternately arranged along a second direction, the first glue layer and the second glue layer extend along a third direction, and the third direction is basically vertical to the second direction,
the first colloid layer and the second colloid layer are at least arranged in the foldable display area, the elastic modulus of the first colloid layer and the elastic modulus of the second colloid layer are different, and an included angle theta between the first direction and the third direction is larger than or equal to 0 degree and smaller than or equal to 45 degrees.
In some embodiments, the flexible display substrate includes a substrate base plate and a display component disposed on the substrate base plate, one of the first and second glue layers has a modulus of elasticity less than a modulus of elasticity of the substrate base plate, and the other of the first and second glue layers has a modulus of elasticity greater than or equal to the modulus of elasticity of the substrate base plate.
In some embodiments, the first and second glue layers occupy the first planar display area, the foldable display area, and the second planar display area.
In some embodiments, the first and second glue layers occupy the foldable display area, the glue layer further comprising a third glue layer occupying the first and second planar display areas, the third glue layer being of the same material as the one of the first and second glue layers having the greater modulus of elasticity.
In some embodiments, the colloidal layer is formed by ink-jet printing.
In some embodiments, the first colloid layer and the second colloid layer are in a strip shape, and a ratio of a width of one of the first colloid layer and the second colloid layer having a larger elastic modulus to a width of one of the first colloid layer and the second colloid layer having a smaller elastic modulus is 10.
In some embodiments, the first and second colloid layers have substantially the same thickness, and the first and second colloid layers have a thickness of 1 μm to 100 μm.
In some embodiments, the thickness of the first and second colloidal layers having the greater modulus of elasticity is slightly less than the thickness of the first and second colloidal layers having the lesser modulus of elasticity.
In some embodiments, the first and second colloidal layers are in the form of linear stripes, periodic meander-line stripes, or periodic curved stripes.
Some embodiments of the present invention provide a method of manufacturing a foldable display panel, the method including:
providing a flexible display substrate and a flexible cover plate, wherein the flexible display substrate comprises a first planar display area, a foldable display area and a second planar display area which are sequentially arranged adjacently, and the foldable display area extends along a first direction;
forming a colloid layer on the flexible display substrate, wherein the colloid layer comprises a first colloid layer and a second colloid layer which are alternately arranged along a second direction, the first colloid layer and the second colloid layer extend along a third direction, the third direction is basically vertical to the second direction, the first colloid layer and the second colloid layer are at least arranged in the foldable display area, the elastic modulus of the first colloid layer and the elastic modulus of the second colloid layer are different, and an included angle theta between the first direction and the third direction satisfies 0 DEG-45 DEG; and
and the flexible cover plate is attached to one side of the flexible display substrate, which is provided with the colloid layer.
In some embodiments, forming a colloidal layer on the flexible display substrate comprises:
and forming a first colloid layer and a second colloid layer which are alternately arranged along a second direction on at least the foldable display area by adopting an ink-jet printing mode, wherein the forming thickness of one of the first colloid layer and the second colloid layer with a larger elastic modulus is slightly smaller than that of the other one of the first colloid layer and the second colloid layer with a smaller elastic modulus.
In some embodiments, the first and second glue layers occupy the foldable display area, the glue layer further comprising a third glue layer occupying the first and second planar display areas, the forming a glue layer on the flexible display substrate comprising:
forming one of a first colloid layer and a second colloid layer which are arranged at intervals along a second direction on the foldable display area by using a first ink-jet material through ink-jet printing, wherein the colloid layer has a larger elastic modulus, and forming a third colloid layer on the first planar display area and the second planar display area; and
and forming the first colloid layer and the second colloid layer which are arranged at intervals along the second direction on the foldable display area by using a second ink-jet material through ink-jet printing, wherein the first colloid layer and the second colloid layer have a smaller elastic modulus.
The scheme of the embodiment of the invention has the following beneficial effects:
the colloid layer used for bonding the flexible display substrate and the flexible cover plate comprises a first colloid layer and a second colloid layer which are alternately arranged. The first colloid layer and the second colloid layer are at least arranged in the foldable display area, the elastic modulus of the first colloid layer and the elastic modulus of the second colloid layer are different, the included angle theta between the extending direction of the first colloid layer and the extending direction of the second colloid layer and the extending direction of the foldable display area is larger than or equal to 0 degree and smaller than or equal to 45 degrees, and the crease of the foldable display panel can be eliminated or lightened.
The colloid layer is formed by adopting an ink-jet printing mode, the thickness of the colloid layer can be reduced, the thickness and the material of the colloid layer in different areas can be accurately controlled, and meanwhile, the yield can be improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic cross-sectional structural view of a foldable display panel according to some embodiments of the present invention;
FIG. 2 is a schematic top view of a foldable display panel according to some embodiments of the present invention;
FIG. 3 is a schematic cross-sectional view taken along line AA' of FIG. 2;
FIG. 4 is a schematic top view of a foldable display panel according to some embodiments of the present invention;
FIG. 5 is a schematic cross-sectional view taken along line BB' of FIG. 4;
fig. 6 is a schematic structural diagram of a first colloid layer and/or a second colloid layer according to some embodiments of the present invention;
fig. 7 is a flowchart of a method for manufacturing a foldable display panel according to some embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention 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, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe embodiments of the present invention, they should not be limited to these terms.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or apparatus. Without further limitation, the recitation of an element by the phrase "comprising a" does not exclude the presence of additional like elements in a commodity or device comprising the element.
In the related art, a foldable display panel, such as an OLED display panel, generally includes a display substrate and a display cover plate, and the display substrate and the display cover plate are bonded by a glue layer. The colloidal layer is usually an Optical Clear Adhesive (OCA) layer, which is a solid film layer, and the material and thickness of the whole layer of the transparent Optical Adhesive layer are consistent. The manufacturing process of the foldable display panel generally includes applying a transparent optical adhesive layer on the display substrate, and then aligning and pressing the display cover plate and the display substrate. The foldable display panel in the related art has a high probability of having a crease, and the colloidal layer formed by the above process has a large thickness and is prone to process defects such as bubbles.
In order to overcome the above problems, the present invention provides a foldable display panel including: the flexible display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged, wherein the foldable display area extends along a first direction; the flexible cover plate is arranged on the flexible display substrate; and a colloid layer disposed between the flexible display substrate and the flexible cover plate and configured to bond the flexible display substrate and the flexible cover plate, wherein the colloid layer includes a first colloid layer and a second colloid layer alternately disposed along a second direction, the first colloid layer and the second colloid layer extend along a third direction, the third direction is substantially perpendicular to the second direction, the first colloid layer and the second colloid layer are disposed at least within the foldable display area, elastic moduli of the first colloid layer and the second colloid layer are different, and an included angle θ between the first direction and the third direction satisfies 0 ° ≦ θ ≦ 45 °. With the structure, the folding mark of the foldable display panel can be eliminated or lightened.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic cross-sectional structural diagram of a foldable display panel according to some embodiments of the present invention. Fig. 2 is a schematic top view of a foldable display panel according to some embodiments of the present invention, wherein the flexible cover is not shown, and fig. 3 is a schematic cross-sectional structure taken along line AA' in fig. 2.
As shown in fig. 1 to 3, the present invention provides a foldable display panel 100, and the foldable display panel 100 includes a flexible display substrate 10, a flexible cover 30, and a glue layer 20.
The flexible display substrate 10, for example, an OLED display substrate, includes a first planar display area DA1, a foldable display area FA, and a second planar display area DA2, which are sequentially adjacently arranged, the foldable display area FA extends along a first direction, for example, the illustrated X direction, and specifically, the first planar display area DA1, the foldable display area FA, and the second planar display area DA2 are sequentially adjacently arranged, for example, along a direction perpendicular to the X direction. The foldable display panel 100 may be, for example, folded in a direction perpendicular to the X direction, for example, a length direction of the foldable display panel 100. In the process of performing the folding of the foldable display panel 100, the first and second planar display areas DA1 and DA2 are not substantially deformed, and the foldable display area FA is subjected to a folding deformation.
The flexible cover 30 is disposed on the flexible display substrate 10, covers the flexible display substrate 10, and protects the display devices and the like on the flexible display substrate 10. The flexible cover 30 is made of, for example, glass, acrylic material, etc.
The glue layer 20 is arranged between the flexible display substrate 10 and the flexible cover sheet 30 and configured to bond the flexible display substrate 10 and the flexible cover sheet 30. The glue layer 20 may be a width direction of the foldable display panel 100 along a second direction, such as the illustrated Y direction, and the direction along which the first glue layer 21 and the second glue layer 22 alternately arranged and the aa' line extend is the second direction. The first glue layer 21 and the second glue layer 22 extend along a third direction, which is substantially perpendicular to the second direction, for example, the illustrated Z direction, as shown in fig. 2, and the first direction, the second direction and the third direction are coplanar.
As shown in fig. 1 to 3, the first and second colloid layers 21 and 22 are disposed at least in the foldable display area FA, the elastic moduli of the first and second colloid layers 21 and 22 are different, and the included angle θ between the first direction and the third direction satisfies 0 ° ≦ θ ≦ 45 °, and with this structure, the folding of the foldable display panel may be eliminated or reduced, and in particular, the first and second colloid layers 21 and 22 having different elastic moduli may be alternately disposed, so that the foldable display panel 100 as a whole may have better resilience characteristics, thereby eliminating or reducing the folding of the foldable display panel.
In some embodiments, θ is, for example, 0 °, and the third direction coincides with the first direction, for example, both width directions of the foldable display panel 100, and the foldable display area FA of the flexible display substrate 10 may have a smaller curvature radius when folded.
In some embodiments, the flexible display substrate 10 includes a substrate 11 and a display component 12 disposed on the substrate 11, the substrate 11 is made of PI (polyimide) material, for example, and the display component 12 includes an OLED display device, for example, one of the first colloid layer 21 and the second colloid layer 22 has an elastic modulus smaller than that of the substrate 11, and the other of the first colloid layer 21 and the second colloid layer 22 has an elastic modulus greater than or equal to that of the substrate 11. For example, the first colloid layer 21 is made of epoxy resin or silicone material, and the second colloid layer 22 is made of PI (polyimide) or acrylic material. For the foldable display panel 100, the region provided with the first colloid layer 21 can improve toughness, so as to prevent the substrate base plate in the region from generating unrecoverable deformation due to stress borne by the substrate base plate, and the region provided with the second colloid layer 22 can enhance rigidity, so that the region is not easy to reach a curvature radius which enables the substrate base plate in the region to generate unrecoverable deformation. Accordingly, the foldable display panel 100 adopting the above structure may avoid or reduce the crease.
In some embodiments, the flexible display substrate 10 may further include an encapsulation layer disposed on a side of the display device 12 away from the substrate 11, the encapsulation layer covering the encapsulated display device with alternating organic thin film layers and inorganic thin film layers to protect the display device, for example, using Thin Film Encapsulation (TFE) technology, and the glue layer 20 may be disposed on a side of the encapsulation layer away from the substrate 11.
In some embodiments, the substrate 11 may also be made of glass, silicon nitride, silicon oxide, aluminum oxide, or PET (polyester resin).
In some embodiments, as shown in fig. 2 to 3, the first and second glue layers 21 and 22 occupy the first planar display area DA1, the foldable display area FA, and the second planar display area FA. Herein, the occupation refers to an overlay, as shown in fig. 2 to 3, for example, the first and second glue layers 21 and 22 overlay the first planar display area DA1, the foldable display area FA, and the second planar display area FA.
In some embodiments, the difference in the elastic modulus of the first and second colloid layers 21 and 22 is no greater than 2GPa, such as 0.5GPa.
In some embodiments, the refractive index of the first colloid layer 21 and the second colloid layer 22 does not exceed 0.2, thereby avoiding display defects caused by the larger refractive index of the two.
In some embodiments, the colloidal layer 20 is formed by ink-jet printing. The scheme that the colloid layer has the same material can be realized by adopting an ink-jet printing mode. In the related art, the colloid layer is usually a transparent Optical Adhesive (OCA) layer, which is a solid film layer, and the material and thickness of the whole transparent Optical Adhesive layer are consistent, so that the requirements of different materials in different regions of the colloid layer or different thicknesses of colloid layers in different regions cannot be met. The thickness of the colloid layer can be accurately controlled by adopting ink-jet printing to form the colloid layer, so that the thickness of the colloid layer is thinner, and the lightness and thinness of the foldable display panel are more facilitated.
Fig. 4 is a schematic top view of a foldable display panel provided in some embodiments of the present invention, where a flexible cover is not shown, and fig. 5 is a schematic cross-sectional structure view taken along a line BB' in fig. 4. The direction in which the BB' line extends is the second direction. The embodiment shown in fig. 4 and 5 differs from the embodiment shown in fig. 2 and 3 mainly in that the first glue layer 21 and the second glue layer 22 only occupy the foldable display area FA. The colloid layer 20 further includes a third colloid layer 23, the third colloid layer 23 occupies the first and second planar display areas DA1 and DA2, and the third colloid layer 23 and one of the first and second colloid layers 21 and 22 having a larger elastic modulus are made of the same material, for example, the third colloid layer 23 and the second colloid layer 22 are made of the same material, for example, both PI materials are used. In other embodiments, the material of the third colloid layer 23 may be different from the material of the first colloid layer 21 and the second colloid layer 22, and the elastic modulus thereof is, for example, greater than or equal to the elastic modulus of the substrate 11.
The third colloid layer 23 with a larger elastic modulus is used for the first and second planar display areas DA1 and DA2 which do not need to be bent, so that the structural strength of the areas can be enhanced, and the foldable display panel 100 is firmer as a whole. The third colloid layer 23 occupying the first and second planar display areas DA1 and DA2 may be made of the same material as the second colloid material 22 having a larger elastic modulus in the foldable display area FA, and in the inkjet printing process, the third colloid layer 23 and the second colloid layer 22 may sample the same nozzle to perform printing, and material and raw material do not need to be replaced, so that the process efficiency may be improved. In addition, for the third colloid layer 23 formed in a large area, inkjet printing can be performed in a mode in which the amount of ink ejected per unit time is larger, further providing process efficiency.
In some embodiments, the first colloid layer 21 and the second colloid layer 22 are both in a strip shape, and a ratio of a width of one of the first colloid layer and the second colloid layer having a larger elastic modulus to a width of one having a smaller elastic modulus is 10. With this arrangement, the foldable display panel 100 can reduce or avoid creases while ensuring structural strength.
In some embodiments, as shown in fig. 1 to 5, the first and second colloid layers have substantially the same thickness, and the first and second colloid layers have a thickness of 1 μm to 100 μm, for example, 10 μm to 50 μm. The foldable display panel shown in fig. 1 to 5 is a finished panel, that is, the flexible display substrate 10 and the flexible cover 30 are pressed together, and the glue layer 20 between the two is cured. Fig. 2 to 5 are merely for showing the first and second glue layers and the flexible cover 30 is not shown. The thickness of the colloid layer refers to the thickness of the colloid layer in the finished foldable display panel.
In some embodiments, the thickness of the first and second colloidal layers having the greater modulus of elasticity is slightly less than the thickness of the first and second colloidal layers having the lesser modulus of elasticity. The forming thickness refers to the thickness of the colloid layer formed by ink-jet printing in the manufacturing process, and the colloid layer is not extruded by the flexible cover plate 30 and is not subjected to the curing process. In some embodiments, the ratio of the formed thickness of the one of the first and second gel layers having the greater modulus of elasticity to the formed thickness of the one of the first and second gel layers having the lesser modulus of elasticity is, for example, 1.1 to 1.2. For example, the second colloid layer 22 is formed to a thickness slightly smaller than the first colloid layer 21, and the second colloid layer 22 is formed to a thickness 5 to 10 μm smaller than the first colloid layer 21. The thickness of the first colloid layer 21 is relatively thick, and all the regions thereof can absorb more deformation stress, so as to avoid or reduce the unrecoverable deformation, i.e. crease, of the substrate base plate of the corresponding region.
Fig. 6 is a schematic structural diagram of the first colloid layer and/or the second colloid layer according to some embodiments of the present invention. The first glue layer 21 and the second glue layer 22 may be in the form of a linear strip, a periodic broken line strip or a periodic curved line strip.
In some embodiments, referring to fig. 2-5, both first colloidal layer 21 and second colloidal layer 22 are in the shape of linear strips.
In some embodiments, as shown in fig. 6 (a), both the first and second glue layers 21 and 22 are in the form of periodic broken line stripes.
In some embodiments, as shown in fig. 6 (b), both the first and second colloid layers 21 and 22 are in the form of periodic curved strips.
Fig. 7 is a flowchart of a method for manufacturing a foldable display panel according to some embodiments of the present invention, and as shown in fig. 7, the present invention provides a method for manufacturing a foldable display panel, which includes the following steps S701 to S703.
S701: providing a flexible display substrate and a flexible cover plate, wherein the flexible display substrate comprises a first planar display area, a foldable display area and a second planar display area which are sequentially arranged adjacently, and the foldable display area extends along a first direction;
specifically, the flexible display substrate is, for example, an OLED display substrate, and includes, for example, a substrate, for example, a PI substrate, and a display device, for example, an organic light emitting diode, and an encapsulation layer formed on the substrate, for example, the encapsulation layer covers the display device with alternating organic thin film layers and inorganic thin film layers, for example, using Thin Film Encapsulation (TFE) technology. The flexible display substrate 10, for example, an OLED display substrate, includes a first planar display area DA1, a foldable display area FA, and a second planar display area DA2, which are adjacently arranged in sequence, wherein the foldable display area FA extends along a first direction, for example, the illustrated X direction. The foldable display panel 100 may be, for example, folded in a direction perpendicular to the X direction, for example, a length direction of the foldable display panel 100. In the process of performing the folding of the foldable display panel 100, the first and second planar display areas DA1 and DA2 are not substantially deformed, and the foldable display area FA is subjected to a folding deformation.
And a flexible cover 30 for covering the flexible display substrate 10 to protect the display device and the like on the flexible display substrate 10. The flexible cover 30 is made of glass, acrylic material, or the like.
S702: forming a glue layer on a flexible display substrate, wherein the glue layer comprises a first glue layer and a second glue layer which are alternately arranged along a second direction, the first glue layer and the second glue layer extend along a third direction, the third direction is basically vertical to the second direction, the first glue layer and the second glue layer are at least arranged in the foldable display area, the elastic modulus of the first glue layer and the elastic modulus of the second glue layer are different, and an included angle theta between the first direction and the third direction is more than or equal to 0 DEG and less than or equal to 45 DEG;
specifically, first and second glue layers 21, 22 alternately arranged in the Y-direction are formed on the flexible display substrate 10, the first and second alternating layers 21, 22 being for example arranged at least in the foldable display area FA, both extending for example in the Z-direction. The elastic modulus of the first colloid layer 21 and the second colloid layer 22 are different, for example, the elastic modulus of the first colloid layer 21 is lower than that of the second colloid layer 22, for example, the first colloid layer 21 is made of epoxy resin or silicone material, and the second colloid layer 22 is made of PI (polyimide) or acrylic material. The angle theta between the X direction and the Z direction is 0 DEG-45 DEG, and theta is 0 DEG, for example.
S703: and attaching the flexible cover plate to one side of the flexible display substrate, which is provided with the colloid layer.
And attaching the flexible cover plate to one side of the flexible display substrate with the colloid layer by adopting an alignment and pressing process, so that the flexible cover plate and the flexible display substrate are bonded together under the action of the colloid layer to form the foldable display panel. The foldable display panel may then be cured, e.g., uv cured, thermal cured, etc., such that the glue layer located between the flexible cover sheet and the flexible display substrate is cured.
In some embodiments, the forming of the colloidal layer on at least the foldable display area in step 702 may be as follows:
and forming a first colloid layer and a second colloid layer which are alternately arranged along a second direction on at least the foldable display area by adopting an ink-jet printing mode, wherein the forming thickness of one of the first colloid layer and the second colloid layer with a larger elastic modulus is slightly smaller than that of the other one of the first colloid layer and the second colloid layer with a smaller elastic modulus. For example, the second colloid layer 22 is formed to a thickness slightly smaller than the first colloid layer 21, and the second colloid layer 22 is formed to a thickness 5 to 10 μm smaller than the first colloid layer 21. The thickness of the first colloid layer 21 is relatively thick, and all the regions can absorb more deformation stress, so as to avoid or reduce the unrecoverable deformation, i.e. crease, of the substrate base plate of the corresponding region.
In some embodiments, the first and second glue layers occupy the foldable display area, the glue layer further includes a third glue layer occupying the first and second planar display areas, and the forming the glue layer on at least the foldable display area in step S702 specifically includes the following steps:
s7021: and forming a third colloid layer in the first and second planar display areas by using ink jet printing and using a first ink jet material to form the colloid layer with the larger elastic modulus in the first and second colloid layers which are arranged on the foldable display area at intervals along the second direction.
Specifically, for example, the third colloid layer 23 and the second colloid layer 22 are made of the same material, for example, PI materials are used to form the third colloid layer 23 and the second colloid layer 22 by using PI materials in an inkjet printing manner, the second colloid layer 22 spaced in the Y direction is formed on the foldable display area FA, the third colloid layer 23 is formed on the first planar display area DA1 and the second planar display area DA2, and the order of forming the second colloid layer 22 and the third colloid layer 23 may be set according to actual needs, for example, the third colloid layer 23 is formed on the first planar display area DA1 and the second planar display area DA2 and then the second colloid layer 22 spaced on the foldable display area FA is formed, or for example, the second colloid layer 22 spaced on the foldable display area FA is formed first and then the third colloid layer 23 is formed on the first planar display area DA1 and the second planar display area DA 2; or for example, the third colloid layer 23 is formed on the first planar display area DA1, then the second colloid layer 22 is formed on the foldable display area FA, and then the third colloid layer 23 is formed on the second planar display area DA 2.
S7022: and forming the lower elastic modulus of the first colloid layer and the second colloid layer which are arranged at intervals along the second direction on the foldable display area by using a second ink jet material through ink jet printing.
Specifically, the first colloid layer 21 is made of epoxy resin or silicone material, and is filled in the gap formed by the second colloid layer 22 by means of inkjet printing, so that the first colloid layer 21 and the second colloid layer 22 are alternately generated at intervals.
In some embodiments, the sequence of steps S7021 and S7022 may be interchanged, that is, the first colloid layer and the second colloid layer having the smaller elastic modulus may be formed first, and then the first colloid layer and the second colloid layer having the larger elastic modulus and the third colloid layer may be formed.
In the foregoing embodiment, the colloid layer is formed on the flexible display substrate by inkjet printing, and in other embodiments, the colloid layer may also be formed on the flexible cover plate by inkjet printing, and then the flexible display substrate is attached to the side of the flexible cover plate where the colloid layer is disposed.
Finally, it should be noted that: in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The system or the device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. A foldable display panel, comprising:
the flexible display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged, wherein the foldable display area extends along a first direction;
the flexible cover plate is arranged on the flexible display substrate; and
a glue layer disposed between the flexible display substrate and the flexible cover sheet configured to bond the flexible display substrate and the flexible cover sheet,
wherein the glue layer comprises a first glue layer and a second glue layer which are alternately arranged along a second direction, the first glue layer and the second glue layer extend along a third direction, and the third direction is basically vertical to the second direction,
the first colloid layer and the second colloid layer are at least arranged in the foldable display area, the elastic modulus of the first colloid layer and the elastic modulus of the second colloid layer are different, and an included angle theta between the first direction and the third direction is larger than or equal to 0 degree and smaller than or equal to 45 degrees.
2. The foldable display panel of claim 1, wherein the flexible display substrate comprises a base substrate and a display component disposed on the base substrate, one of the first and second glue layers having a modulus of elasticity less than a modulus of elasticity of the base substrate, and the other of the first and second glue layers having a modulus of elasticity greater than or equal to the modulus of elasticity of the base substrate.
3. The foldable display panel of claim 1 or 2, wherein the first and second glue layers occupy the first, foldable, and second planar display areas.
4. The foldable display panel of claim 1 or 2, wherein the first and second glue layers occupy the foldable display area, the glue layer further comprising a third glue layer occupying the first and second planar display areas, the third glue layer being of the same material as the one of the first and second glue layers having the greater modulus of elasticity.
5. The foldable display panel of claim 1 or 2, wherein the colloidal layer is formed by inkjet printing.
6. The foldable display panel according to claim 1 or 2, wherein the first and second glue layers are strip-shaped, and a ratio of a width of one of the first and second glue layers having a larger elastic modulus to a width of one having a smaller elastic modulus is 10.
7. The foldable display panel according to claim 1 or 2, wherein the first and second glue layers have substantially the same thickness, the first and second glue layers having a thickness of 1-100 μ ι η.
8. The foldable display panel according to claim 1 or 2, wherein a formation thickness of one of the first and second glue layers having a larger elastic modulus is slightly smaller than a formation thickness of one of the first and second glue layers having a smaller elastic modulus.
9. The foldable display panel according to claim 1 or 2, wherein the first and second glue layers are in the form of linear stripes, periodic meander line stripes or periodic curved stripes.
10. A method of manufacturing a foldable display panel, the method comprising:
providing a flexible display substrate and a flexible cover plate, wherein the flexible display substrate comprises a first planar display area, a foldable display area and a second planar display area which are sequentially arranged adjacently, and the foldable display area extends along a first direction;
forming a colloid layer on the flexible display substrate, wherein the colloid layer comprises a first colloid layer and a second colloid layer which are alternately arranged along a second direction, the first colloid layer and the second colloid layer extend along a third direction, the third direction is basically vertical to the second direction, the first colloid layer and the second colloid layer are at least arranged in the foldable display area, the elastic modulus of the first colloid layer and the elastic modulus of the second colloid layer are different, and an included angle theta between the first direction and the third direction is more than or equal to 0 DEG and less than or equal to 45 DEG; and
and attaching the flexible cover plate to one side of the flexible display substrate, which is provided with the colloid layer.
11. The manufacturing method of claim 10, wherein forming a gel layer on the flexible display substrate comprises:
and forming a first colloid layer and a second colloid layer which are alternately arranged along a second direction on at least the foldable display area by adopting an ink-jet printing mode, wherein the forming thickness of one of the first colloid layer and the second colloid layer with a larger elastic modulus is slightly smaller than that of the other one of the first colloid layer and the second colloid layer with a smaller elastic modulus.
12. The manufacturing method according to claim 10, wherein the first and second glue layers occupy the foldable display area, the glue layer further comprising a third glue layer occupying the first and second planar display areas, the forming a glue layer on the flexible display substrate comprising:
forming one of a first colloid layer and a second colloid layer which are arranged at intervals along a second direction on the foldable display area by using a first ink-jet material through ink-jet printing, wherein the colloid layer has a larger elastic modulus, and forming a third colloid layer on the first planar display area and the second planar display area; and
and forming the first colloid layer and the second colloid layer which are arranged at intervals along the second direction on the foldable display area by using a second ink-jet material through ink-jet printing, wherein the first colloid layer and the second colloid layer have a smaller elastic modulus.
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| CN202211035201.6A CN115294873A (en) | 2022-08-26 | 2022-08-26 | Foldable display panel and method of manufacturing the same |
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| CN202211035201.6A CN115294873A (en) | 2022-08-26 | 2022-08-26 | Foldable display panel and method of manufacturing the same |
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| CN115843207A (en) * | 2023-02-22 | 2023-03-24 | 科迪华显示技术(绍兴)有限公司 | Flexible OLED display panel and manufacturing method thereof |
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