CN112185256A - Foldable display device and method of manufacturing the same - Google Patents
Foldable display device and method of manufacturing the same Download PDFInfo
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- CN112185256A CN112185256A CN202011063274.7A CN202011063274A CN112185256A CN 112185256 A CN112185256 A CN 112185256A CN 202011063274 A CN202011063274 A CN 202011063274A CN 112185256 A CN112185256 A CN 112185256A
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- foldable display
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- protective layer
- glass
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Abstract
The embodiment of the invention provides a foldable display device and a preparation method thereof, relates to the technical field of display, and is used for improving the strength and the scratch resistance of the surface of the foldable display device. The preparation method comprises the steps of providing a foldable display panel and an ultrathin glass mother board; the ultrathin glass mother board is provided with a first surface and a second surface which are oppositely arranged along the thickness direction of the ultrathin glass mother board; forming a first organic protective layer on the first surface of the ultrathin glass mother board, wherein the first organic protective layer is in contact with the first surface and covers the first surface; cutting the ultrathin glass mother board formed with the first organic protective layer to obtain an ultrathin glass daughter board, wherein the cutting surface of the ultrathin glass daughter board is intersected with the first surface and the second surface; and attaching the ultrathin glass sub-plate to the light emergent side of the foldable display panel, wherein the first surface is positioned on one side of the second surface close to the foldable display panel.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a foldable display device and a preparation method thereof.
[ background of the invention ]
With the continuous development of display technology, in order to meet different use requirements of users, various display products with different characteristics are produced accordingly, and a foldable display device is a novel flexible display product. When the foldable display device is used, a user can fold the foldable display device according to needs so as to reduce the size of the display device and improve the portability of the display device. Alternatively, the foldable display device may be unfolded to obtain a large display screen. Currently, performance improvement of foldable display devices has become a focus of research.
[ summary of the invention ]
The embodiment of the invention provides a foldable display device and a preparation method thereof, which are used for improving the strength of the foldable display device and the scratch resistance of the surface.
In one aspect, an embodiment of the present invention provides a method for manufacturing a foldable display device, including:
providing a foldable display panel and an ultrathin glass mother board; the ultrathin glass mother board is provided with a first surface and a second surface which are oppositely arranged along the thickness direction of the ultrathin glass mother board;
forming a first organic protective layer on a first surface of the ultrathin glass mother board, wherein the first organic protective layer is in contact with the first surface and covers the first surface;
cutting the ultrathin glass mother board formed with the first organic protection layer to obtain an ultrathin glass daughter board, wherein the cutting surface of the ultrathin glass daughter board is intersected with the first surface and the second surface;
and the ultrathin glass sub-plate is attached to the light emergent side of the foldable display panel, wherein the first surface is positioned on one side of the second surface close to the foldable display panel.
In another aspect, an embodiment of the present invention provides a foldable display device, including:
a foldable display panel;
the ultrathin glass is positioned on the light emergent side of the foldable display panel; the ultra-thin glass has a first surface, a second surface, and a side; the first surface and the second surface are oppositely arranged, and the first surface is positioned at one side of the second surface close to the foldable display panel; the side surface intersects the first surface and the second surface;
a first organic protective layer in contact with the first surface, the first organic protective layer covering the first surface.
According to the foldable display device and the preparation method thereof provided by the embodiment of the invention, the ultrathin glass sub-plate is arranged on the light emergent side of the foldable display panel, so that the surface of the foldable display panel can be effectively protected by utilizing the good light transmission and mechanical strength of the ultrathin glass sub-plate. Moreover, compared with Colorless Polyimide (CPI), the ultra-thin glass sub-panel has higher impact strength and better scratch resistance, when the ultra-thin glass sub-panel is bent along with the bending of the foldable display panel 1, the surface of the ultra-thin glass sub-panel is not easy to generate creases, and the visual effect of the foldable display device can be improved.
In addition, the first sub organic protective layer is formed on one side, close to the foldable display panel, of the ultrathin glass daughter board, on the basis of keeping good mechanical properties of the ultrathin glass daughter board, the ultrathin glass daughter board can be protected by the first sub organic protective layer with high flexibility, when the ultrathin glass daughter board is impacted by external force, the external force can be absorbed by the first sub organic protective layer, the ultrathin glass daughter board is prevented from being broken, the impact strength of the ultrathin glass daughter board is improved, and therefore when the first sub organic protective layer and the ultrathin glass daughter board are applied to the foldable display device, the foldable display panel in the foldable display device can be effectively protected. On the basis, the ultrathin glass sub-plate with higher strength is arranged on the outermost side of the foldable display device, so that scraping marks on the surface of the foldable display device when a user touches the foldable display device can be avoided.
In addition, according to the embodiment of the invention, the first organic protective layer is prepared first, and then the ultrathin glass is cut, so that the first organic protective layer can be prepared through one process, and then the first sub-organic protective layers for the plurality of foldable display devices are formed through cutting, and the manufacturing process of the foldable display devices is simplified.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for manufacturing a foldable display device according to an embodiment of the present invention;
FIG. 2 is a schematic structural flow chart of the foldable display device corresponding to FIG. 1;
FIG. 3 is a schematic diagram of an alignment process for attaching the ultra-thin sub-glass panel to the foldable display panel;
FIG. 4 is a schematic top view of an ultra-thin sub-glass panel provided with a second organic protective layer;
FIG. 5 is a schematic perspective view of an ultra-thin glass sub-panel provided with a second organic protective layer;
fig. 6 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of an ultra-thin glass daughter board after etching;
FIG. 8 is a schematic cross-sectional view of another foldable display device provided in accordance with an embodiment of the present invention;
fig. 9 is a schematic top view of a foldable display device in an unfolded state according to an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view along AA' of FIG. 9;
FIG. 11 is a schematic top view of a foldable display device according to an embodiment of the present invention in a folded state;
FIG. 12 is a schematic cross-sectional view along BB' of FIG. 11;
fig. 13 is an enlarged schematic view of an end portion of an ultra-thin sub-glass sheet provided with a second organic protective layer.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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.
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 the organic layers in the embodiments of the present invention, the organic layers should not be limited to these terms. These terms are only used to distinguish the organic layers different in respective positions from each other. For example, a first organic layer may also be referred to as a second organic layer, and similarly, a second organic layer may also be referred to as a first organic layer, without departing from the scope of embodiments of the present invention.
An embodiment of the present invention provides a method for manufacturing a foldable display device, as shown in fig. 1 and fig. 2, fig. 1 is a schematic flow chart of a method for manufacturing a foldable display device according to an embodiment of the present invention, and fig. 2 is a schematic flow chart of a structure of a foldable display device corresponding to fig. 1, where the method for manufacturing a foldable display device includes:
step S0: a foldable display panel 1 and an Ultra Thin Glass (UTG) mother substrate 2 are provided. Alternatively, the usable area of the ultra-thin mother glass sheet 2 may be larger than the usable area of the foldable display panel 1. The available area of the foldable display panel 1 and the ultra-thin mother glass sheet 2 refers to an area passing through the surfaces of the first direction x and the second direction y as shown in fig. 2 in both. The thickness direction of both is a third direction z perpendicular to the first direction x and the second direction y. The ultra-thin glass mother substrate 2 has a first surface 21 and a second surface 22 oppositely disposed in the third direction z.
Step S1: a first organic protection layer 31 having a certain thickness is formed on the first surface 21 of the ultra-thin glass mother substrate 2, the first organic protection layer 31 is in contact with the first surface 21, and the first organic protection layer 31 covers the first surface 21 of the ultra-thin glass mother substrate 2. For example, when the first organic protective layer 31 is formed, the organic material may be prepared into a liquid raw material, and then the liquid raw material is disposed on the first surface 21 of the ultra-thin mother glass substrate 2 by brushing or printing, and then the first organic protective layer 31 is formed on the first surface 21 of the ultra-thin mother glass substrate 2 through a curing process.
Step S2: the ultra-thin glass mother substrate 2 formed with the first organic protective layer 31 is cut to form a plurality of ultra-thin glass sub-substrates 20 having a small area. In the cutting process, the first organic protective layer 31 and the ultra-thin glass mother substrate 2 are cut together as a whole. The first organic protective layer 31 is cut into a plurality of first sub organic protective layers 310 with a smaller usable area, and the ultra-thin glass mother substrate 2 is cut into a plurality of ultra-thin glass sub-substrates 20 with a smaller usable area. In the embodiment of the present invention, the structures of the ultra-thin mother glass sheet 2 and the ultra-thin daughter glass sheet 20, and the first organic protective layer 31 and the first sub-organic protective layer 310 may be the same, except for the difference in the available area, i.e., whether or not cutting is performed. The first sub-organic protective layer 310 is in contact with the first surface 21 of the ultra-thin sub-glass sheet 20. The area of the cut ultra-thin sub-glass plate 20 matches the area of the foldable display panel 1. The cut surface is the side 200 of the ultra-thin sub-glass plate 20 formed after cutting. The side 200 of the ultra-thin glass sub-panel 20 intersects the first surface 21 and the second surface 22 of the ultra-thin glass sub-panel 20. For example, in the embodiment of the present invention, after the first organic protective layer 31 is attached to the first surface 31 of the ultra-thin glass 2 and before the ultra-thin mother glass 2 is cut, a cutting line may be formed on the surface of the first organic protective layer 31 away from the ultra-thin mother glass 2 or on the second surface 22 of the ultra-thin mother glass 2, and then the cutting may be performed along the cutting line using a cutting tool. The cutting tool can be used for cutting by adopting a hard alloy or diamond cutter wheel, or the process can also be carried out by adopting a laser cutting mode.
Step S3: the ultra-thin sub-glass sheet 20 with the first surface 21 covered with the first sub-organic protective layer 310 is attached to the light-emitting side of the foldable display panel 1 to form the foldable display device comprising the ultra-thin sub-glass sheet 20 and the first sub-organic protective layer 310 as shown in fig. 2. Wherein the first surface 21 of the ultra-thin sub-glass sheet 20 is located on the side of the second surface 22 close to the foldable display panel 1. That is, in the foldable display device, the first sub-organic protective layer 310 is located between the ultra-thin glass sub-panel 20 and the foldable display panel 1.
According to the preparation method of the foldable display device provided by the embodiment of the invention, the ultrathin glass sub-plate 20 is arranged on the light emergent side of the foldable display panel 1, so that the surface of the foldable display panel 1 can be effectively protected by utilizing the good light transmittance and mechanical strength of the ultrathin glass sub-plate 20. Moreover, compared with Colorless Polyimide (CPI), the ultra-thin glass sub-panel 20 has higher impact strength and better scratch resistance, and when the ultra-thin glass sub-panel 20 is bent along with the bending of the foldable display panel 1, the surface of the ultra-thin glass sub-panel 20 is not easy to generate creases, so that the visual effect of the foldable display device 100 can be improved.
Moreover, in the embodiment of the present invention, the first sub-organic protection layer 310 is formed on the side of the ultra-thin glass sub-plate 20 close to the foldable display panel 1, on the basis of maintaining the good mechanical properties of the ultra-thin glass sub-plate 20 itself, the ultra-thin glass sub-plate 20 can be protected by the first sub-organic protection layer 310 with greater flexibility, when the ultra-thin glass sub-plate 20 is impacted by an external force, the external force can be absorbed by the first sub-organic protection layer 310, the ultra-thin glass sub-plate 20 is prevented from being broken, the impact strength of the ultra-thin glass sub-plate 20 is improved, and further when the first sub-organic protection layer 310 and the ultra-thin glass sub-plate 20 are applied to a foldable display device, the foldable display panel 1 therein can be effectively. On the basis, the embodiment of the invention arranges the ultra-thin glass sub-panel 20 with higher strength at the outermost side of the foldable display device 100, so that scratch marks on the surface of the foldable display device can be avoided when a user touches the foldable display device.
In addition, in the embodiment of the present invention, the first organic protective layer 31 is prepared first, and then the ultra-thin glass 2 is cut, so that the first organic protective layer 31 can be prepared through one process, and then the first sub-organic protective layers 310 for the plurality of foldable display devices are formed through cutting, thereby simplifying the manufacturing process of the foldable display devices.
Illustratively, the ultra-thin sub-glass sheet 20 has a bending property. As shown in fig. 3, fig. 3 is an alignment schematic diagram of the ultra-thin glass sub-panel and the foldable display panel being attached, the ultra-thin glass sub-panel 20 and the first sub-organic passivation layer 310 both include a bending region Q1, the bending region Q1 includes a bending axis, and the ultra-thin glass sub-panel 20 and the first sub-organic passivation layer 310 can be bent with the bending axis as an axis. Wherein the bending axis may be a virtual axis. In the bending region Q1, the flexibility of the ultra-thin sub-glass plate 20 is greater than or equal to that of other regions in the ultra-thin glass 2, and the flexibility of the foldable display panel 1 is greater than or equal to that of other regions in the foldable display panel 1. When the ultra-thin glass sub-plate 20 is bent, the bending stress applied to the bending region Q1 is greater than or equal to the bending stress applied to other regions. Referring to fig. 3, a method for manufacturing a foldable display device according to an embodiment of the present invention further includes: the second organic protective layer 32 contacting the cut surfaces 200 of the ultra-thin sub-glass plate 20 is formed at the bending region Q1. In the process of manufacturing the ultra-thin glass daughter board 20, as described above, the ultra-thin glass mother board 2 having a large area is generally cut to obtain the ultra-thin glass daughter board 20 having a suitable size. Since the side 200 of the ultra-thin sub-glass plate 20 is formed by cutting, after cutting, the side 200 may have many sharp protrusions such as burrs, and the ultra-thin sub-glass plate 2 has high brittleness at the positions of the sharp protrusions, and if the positions are slightly impacted, cracks are easy to occur, and the ductility of the cracks at the positions is relatively high. Moreover, the bending stress of the bending region of the ultra-thin sub-glass plate 20 is relatively large. In view of the above, in the embodiment of the present invention, the second organic protection layer 32 is disposed on the side 200 of the ultra-thin glass sub-panel 20 located in the bending region Q1, so that the second organic protection layer 32 can be used to protect the portions that are originally easily damaged, thereby reducing the possibility of crack occurrence and crack extension, and increasing the number of times that the ultra-thin glass sub-panel 20 can be bent, so as to improve the bending reliability of the foldable display device including the ultra-thin glass sub-panel 20.
As shown in fig. 3, the method for bonding the ultra-thin glass sub-panel 20 to the light-emitting side of the foldable display panel 1 in step S3 includes: the bending region Q1 of the ultra-thin glass sub-panel 20 is correspondingly attached to the bending region Q1 of the foldable display panel 1, so that the formed foldable display device has relatively large flexibility in the bending region Q1, and the situation that the folding capability of the foldable display device comprising the ultra-thin glass sub-panel 20 and the foldable display panel 1 at the corresponding position is affected due to the fact that the flexibility of the ultra-thin glass sub-panel 20 is not matched with the flexibility of the foldable display panel 1 at the corresponding position is avoided.
Illustratively, in the embodiment of the present invention, the second organic passivation layer 32 may also be disposed at the non-bending region of the ultra-thin sub-glass plate 20. Moreover, when the second organic passivation layer 32 is disposed, the second organic passivation layer 32 in the bending region and the non-bending region can be disposed differently according to the embodiment of the present invention, so as to adapt to the stress of different regions in the ultra-thin glass. Specifically, as shown in fig. 4, fig. 4 is a schematic top view of the ultra-thin glass sub-panel provided with the second organic passivation layer, in the bending region Q1, the second organic passivation layer 32 may be arranged at a predetermined interval, and in the first non-bending region Q21 and the second non-bending region Q22, the second organic passivation layer 32 may be arranged to cover the side surfaces of these regions. So set up, when buckling to ultra-thin glass daughter board 20, in bending zone Q1, the interval between two adjacent second organic protective layers 32 can regard as the second organic protective layer the holding space that meets an emergency when switching between fold condition and non-fold condition, consequently, so set up the performance of buckling that can improve ultra-thin glass daughter board 20, be favorable to improving the number of times of buckling of ultra-thin glass daughter board.
Alternatively, as shown in fig. 5, fig. 5 is a schematic perspective view of an ultra-thin glass sub-panel provided with a second organic protection layer, in an embodiment of the present invention, the second organic protection layer 32 may be disposed to surround a cutting surface of the ultra-thin glass sub-panel 20, so as to increase an area of the second organic protection layer 32, and the second organic protection layer 32 can protect the ultra-thin glass sub-panel 20 from multiple positions along a circumferential direction of the ultra-thin glass sub-panel 20.
Exemplarily, in the embodiment of the present invention, the method for forming the second organic protective layer 32 in contact with the cut surface 200 of the ultra-thin sub-glass plate 20 at the bending region Q1 includes:
forming an organic material in contact with the cut surfaces 200 of the ultra-thin glass sub-plate 20 in the bending region Q1 by inkjet printing or coating; the ultra-thin sub-glass plate 20 formed with the organic material is annealed to form the second organic protective layer 32 contacting the cut surfaces 200 of the ultra-thin sub-glass plate 20 at the bending region Q1.
In the embodiment of the invention, the second organic protective layer 32 contacting with the cutting surface 200 of the ultra-thin glass sub-plate 20 is formed by adopting the annealing process, so that the bonding strength between the second organic protective layer 32 and the cutting surface 200 of the ultra-thin glass sub-plate 20 can be improved, the defects caused by the cutting operation in the cutting surface 200 of the ultra-thin glass sub-plate 20 can be filled with the second organic protective layer 32, and the strength of the cutting surface 200 of the ultra-thin glass sub-plate 20 can be effectively improved.
Alternatively, as shown in fig. 6, fig. 6 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present invention, where the ultra-thin sub-glass plate 20 has a first edge 210 and a second edge 220, the first edge 210 is an intersection line of the first surface 21 and the cutting plane 200, and the second edge 220 is an intersection line of the second surface 22 and the cutting plane 200.
The preparation method of the foldable display device provided by the embodiment of the invention further comprises the following steps:
a third organic protective layer 33 is formed covering the second side 220 of the ultra-thin sub-glass sheet 20. As shown in FIG. 6, the width d of the third organic protective layer 33 satisfies 0.3 mm. ltoreq. d.ltoreq.2 mm. In the embodiment of the invention, the width d of the third organic protection layer 33 is set to be less than or equal to 2mm, so that the light emitted by the foldable display panel 1 can be prevented from being shielded due to the excessively large width, and the light intensity of the foldable display device is not affected. On the other hand, in the embodiment of the present invention, the width d of the third organic protection layer 22 is set to be greater than or equal to 0.3mm, so that the second edge 220 of the ultra-thin glass sub-plate 20 on the cutting surface 200 can be wrapped well, and the situation that the protection degree of the second edge 220 of the ultra-thin glass sub-plate 20 on the cutting surface 200 is insufficient when the width of the second edge is set too small is avoided, and the impact strength of the ultra-thin glass sub-plate 20 is ensured.
Alternatively, in the embodiment of the present invention, the method of forming the third organic protection layer 33 by the above-mentioned coating or printing may also be adopted.
Alternatively, the second organic protective layer 32 and the third organic protective layer 33 may be formed by the same process.
As shown in fig. 7, fig. 7 is a schematic cross-sectional view of the ultra-thin glass sub-panel after etching, in the method for manufacturing a foldable display device according to an embodiment of the present invention, after the step S2 of cutting the ultra-thin glass mother panel 2 with the first organic protection layer 31 formed thereon to obtain the ultra-thin glass sub-panel 20, and before the step Q1 forms the second organic protection layer 32 contacting with the cut surface 200 of the ultra-thin glass sub-panel 20, the method further includes:
the cut surfaces 200 of the ultra-thin sub-glass plates 20 are etched. As shown in fig. 7, where reference numeral 200 represents the location of the cutting plane 200 of the sub-ultra-thin glass sheet 20 before etching, the dashed box represents the portion of the sub-ultra-thin glass sheet 20 that has been etched away during the etching process.
In the embodiment of the invention, by carrying out the corrosion operation on the ultra-thin glass sub-plate 20, the position where stress concentration such as sharp saw teeth and the like on the cutting surface of the ultra-thin glass sub-plate 20 is easy to crack can be eliminated through the cutting process, and the strength of the ultra-thin glass sub-plate 20 can be further improved.
After the ultra-thin sub-glass plate 20 is etched, the second organic protective layer 32 and the third organic protective layer 33 may be continuously formed to form a foldable display device having a structure as shown in fig. 8.
An embodiment of the present invention further provides a foldable display device, which may be manufactured by the manufacturing method as described above, as shown in fig. 9, fig. 9 is a schematic top view of the foldable display device provided in an embodiment of the present invention in an unfolded state, fig. 10 is a schematic cross-sectional view along AA 'of fig. 9, fig. 11 is a schematic top view of the foldable display device provided in an embodiment of the present invention in a folded state, and fig. 12 is a schematic cross-sectional view along BB' of fig. 11, where the foldable display device includes a foldable display panel 1, an ultra-thin sub-glass panel 20, and a first sub-organic protection layer 310 attached to each other. Wherein, the ultra-thin sub-glass plate 20 and the first sub-organic protective layer 310 may be cut from the ultra-thin glass 2 and the first organic protective layer 31 as described above.
The foldable display device 100 includes a bending region Q1 and a non-bending region. Illustratively, the non-inflection zones may include a first non-inflection zone Q21 and a second non-inflection zone Q22. The bending region Q1 includes a bending axis 110, and in the bending region Q1, the foldable display panel 1 and the ultra-thin glass sub-panel 20 can be bent or unfolded around the bending axis 110 to switch between an unfolded state shown in fig. 9 and 10 and a folded state shown in fig. 11 and 12. It should be understood that the folding direction of the foldable display device 100 shown in fig. 12 is only an illustration, and in practice, when the foldable display device 100 is designed, the foldable display device 100 may be bent inward (toward the foldable display panel 1) or the foldable display device 100 may be bent outward (away from the foldable display panel 1), which is not limited in the embodiment of the present invention.
In the embodiment of the present invention, the foldable display panel 1 may be a display panel having flexibility, such as an organic light emitting display panel or a quantum dot light emitting display panel. The foldable display panel 1 may include a light emitting device, a driving circuit layer, an encapsulation layer, a touch layer, and the like.
As shown in fig. 10 and 12, in the embodiment of the present invention, the ultra-thin glass sub-panel 20 is located at the light-emitting side of the foldable display panel 1; the ultra-thin glass sub-sheet 20 has a first surface 21, a second surface 22, and a side 200; the first surface 21 and the second surface 22 are oppositely arranged along the thickness direction z of the ultra-thin glass sub-panel 20, and the first surface 21 is positioned on one side of the second surface 22 close to the foldable display panel 1; the side 200 intersects the first surface 21 and the second surface 22.
With continued reference to fig. 10 and 12, the first sub organic protective layer 310 is in contact with the first surface 21 of the ultra-thin sub glass plate 20, and the first sub organic protective layer 310 covers the first surface 21 of the ultra-thin sub glass plate 20.
According to the foldable display device 100 provided by the embodiment of the invention, the ultrathin glass sub-plate 20 is arranged on the light emergent side of the foldable display panel 1, so that the foldable display panel 1 can be protected by the ultrathin glass sub-plate 20, and the reliability of the foldable display panel 1 in the using process can be improved. Moreover, compared with Colorless Polyimide (CPI), the ultra-thin glass sub-panel 20 has higher strength and better scratch resistance, and when the ultra-thin glass sub-panel 20 is bent along with the bending of the foldable display panel 1, creases are not easily generated on the surface of the ultra-thin glass sub-panel 20, so that the visual effect of the foldable display device 100 can be improved.
Moreover, in the embodiment of the present invention, the first sub organic protection layer 310 covering the first surface 21 is disposed on the first surface 21 of the ultra-thin glass, so that on the basis of maintaining the good mechanical properties of the ultra-thin glass sub-panel 20 itself, the ultra-thin glass sub-panel 20 can be protected by the first sub organic protection layer 310 having greater flexibility, and when the ultra-thin glass is impacted by an external force, the ultra-thin glass sub-panel 20 can be prevented from being broken, and further when the first sub organic protection layer 310 and the ultra-thin glass sub-panel 20 are applied to the foldable display device 100, the foldable display panel 1 therein can be more effectively protected. On the basis, the embodiment of the invention arranges the ultra-thin glass sub-panel 20 with higher strength at the outermost side of the foldable display device 100, so that scratch marks on the surface of the foldable display device 100 when a user touches the foldable display device can be avoided.
Illustratively, as shown in FIGS. 10 and 12, in the embodiment of the present invention, the thickness T1 of the ultra-thin glass 20 satisfies 20 μm. ltoreq. T1. ltoreq.100. mu.m. According to the embodiment of the invention, the thickness of the ultrathin glass 2 is controlled to enable the thickness of the ultrathin glass sub-plate 20 to be less than or equal to 100 microns, so that the strength of the ultrathin glass sub-plate 20 can be improved. Specifically, when the ultra-thin sub-glass sheet 20 is bent, the position of the structure where the maximum bending stress is generated may be located at the farthest position from the neutral plane, and if cracks are generated due to excessive bending, cracks may also be generated at the farthest position from the neutral plane. In the embodiment of the present invention, the thickness of the ultra-thin glass sub-panel 20 is less than or equal to 100 μm, and the upper and lower surfaces of the ultra-thin glass sub-panel 20 are closer to the neutral plane, so that the stress applied to the point of the entire bending part farthest from the neutral plane is reduced and is not enough to cause the generation of cracks in the ultra-thin glass sub-panel 20, thereby improving the strength of the ultra-thin glass sub-panel 20, and making the ultra-thin glass sub-panel 20 have better flexibility and be capable of being folded along with the folding of the foldable display panel 1. On the other hand, in the embodiment of the invention, the thickness of the ultra-thin glass sub-plate 20 is more than or equal to 20 μm, so that the difficulty of the manufacturing process of the ultra-thin glass sub-plate 20 can be reduced.
Optionally, when the thickness T2 of the first sub-organic passivation layer 310 is greater than or equal to 5 μm and less than or equal to T2 and less than or equal to 20 μm, when the first sub-organic passivation layer 310 is formed by a coating process or the like, if the thickness of the first sub-organic passivation layer 310 is too large, defects such as air holes are likely to occur inside the first sub-organic passivation layer, and the surface flatness of the first sub-organic passivation layer 310 is also greatly affected. In the embodiment of the invention, the thickness of the first sub-organic protection layer 310 is set within 20 μm, so that the thickness of the foldable display device 100 is not too large, the compactness of the first sub-organic protection layer 310 can be ensured, and the surface flatness of the first sub-organic protection layer 310 can be improved. Furthermore, the embodiment of the present invention can ensure that the disposition of the first sub-organic protective layer 310 can improve the impact strength of the ultra-thin glass sub-plate 20 by setting the thickness of the first sub-organic protective layer 310 to be 5 μm or more.
As shown in connection with fig. 3, the ultra-thin sub-glass sheet 20 includes a bending region Q1; the ultra-thin sub-glass sheet 20 may be bent via a bending region Q1. The foldable display device further includes a second organic protective layer 32 located at the bending region Q1 and in contact with the side 200 of the ultra-thin sub-glass sheet 20. The provision of the second organic protective layer 32 may improve the flexibility and impact strength of the side 200 of the ultra-thin sub-glass sheet 20. In the process of manufacturing the ultra-thin glass daughter board 20, as described above, the ultra-thin glass mother board 2 having a large area is generally cut to obtain the ultra-thin glass daughter board 20 having a suitable size. Since the side 200 of the ultra-thin sub-glass plate 20 is formed by cutting, after cutting, the side 200 may have many sharp protrusions such as burrs, and the ultra-thin sub-glass plate 2 has high brittleness at the positions of the sharp protrusions, and if the positions are slightly impacted, cracks are easy to occur, and the ductility of the cracks at the positions is relatively high. Moreover, the bending stress of the bending region of the ultra-thin sub-glass plate 20 is relatively large. In view of the above, in the embodiment of the present invention, the second organic protection layer 32 is disposed on the side surface 200 of the bending region Q1 of the ultra-thin sub-glass panel 20, which is in contact with the side surface 200 of the region, so that the second organic protection layer 32 can protect the portions that are originally easily damaged, thereby reducing the possibility of cracks occurring and spreading, and further improving the reliability of the ultra-thin sub-glass panel 20.
Illustratively, in the embodiment of the present invention, the second organic passivation layer 32 may also be disposed at the non-bending region of the ultra-thin sub-glass plate 20. Moreover, when the second organic passivation layer 32 is disposed, the second organic passivation layer 32 in the bending region and the non-bending region can be disposed differently according to the embodiment of the present invention, so as to adapt to the stress of different regions in the ultra-thin glass. Specifically, as shown in fig. 4, in the bending region Q1, the embodiment of the present invention may arrange the second organic protective layer 32 to be arranged at a predetermined interval, and in the first non-bending region Q21 and the second non-bending region Q22, the embodiment of the present invention may arrange the second organic protective layer 32 to cover the side surfaces located in these regions. So set up, when buckling to ultra-thin glass daughter board 20, in bending zone Q1, the interval between two adjacent second organic protective layers 32 can regard as the second organic protective layer the holding space that meets an emergency when switching between fold condition and non-fold condition, consequently, so set up the performance of buckling that can improve ultra-thin glass daughter board 20, be favorable to improving the number of times of buckling of ultra-thin glass daughter board.
Alternatively, as shown in fig. 5, the second organic passivation layer 32 surrounds the side 200 of the ultra-thin sub-glass plate 20, so that the second organic passivation layer 32 protects the ultra-thin sub-glass plate 20 from multiple positions along the circumferential direction of the ultra-thin sub-glass plate 20, thereby further improving the reliability of the ultra-thin sub-glass plate 20.
Referring to fig. 6, the ultra-thin sub-glass sheet 20 includes a first edge 210 and a second edge 220, where the first edge 210 is an intersection of the first surface 21 and the side surface 200, and the second edge 220 is an intersection of the second surface 22 and the side surface 200. The foldable display device 100 further comprises a third organic protective layer 33, the third organic protective layer 33 covering the second side 220 of the ultra-thin glass sub-panel 20: the width d of the third organic protection layer 33 satisfies that d is more than or equal to 0.3mm and less than or equal to 2 mm. In the embodiment of the invention, the width d of the third organic protection layer 33 is set to be less than or equal to 2mm, so that the light emitted by the foldable display panel 1 can be prevented from being shielded due to the excessively large width, and the light intensity of the foldable display device is not affected. On the other hand, in the embodiment of the present invention, the width d of the third organic protection layer 22 is set to be greater than or equal to 0.3mm, so that the second edge 220 of the ultra-thin glass sub-plate 20 on the cutting surface 200 can be wrapped well, and the situation that the protection degree of the second edge 220 of the ultra-thin glass sub-plate 20 on the cutting surface 200 is insufficient when the width of the second edge is set too small is avoided, and the impact strength of the ultra-thin glass sub-plate 20 is ensured.
Optionally, the second organic protection layer 32 and the third organic protection layer 33 include black light-shielding materials to shield light emitted from the side of the foldable display device 100, so as to avoid the lateral light leakage problem of the foldable display device 100. Illustratively, the black light-shielding material may be selected from inks.
Optionally, the first sub-organic protection layer 310 includes a transparent material to avoid affecting normal light emission of the light emitting surface of the foldable display device, and ensure the light emission intensity of the foldable display device. Optical properties. For example, the first sub-organic protective layer 310 may be made of one or more of transparent polyimide, epoxy, acryl, and polyethylene terephthalate.
Illustratively, in the present embodiment, the ultra-thin sub-glass sheet 20 has a surface compressive stress σ satisfying-500 MPa ≦ σ ≦ 1000 MPa. In the actual manufacturing process of the ultra-thin glass 2, since the glass is a brittle material, it is inevitable that many micro-cracks are formed in the inner part and the surface of the ultra-thin glass 2. These microcracks may further propagate under the action of external forces and environmental agents, possibly resulting in a reduction of the bending resistance and the drop and impact resistance of the ultra-thin glass 2. According to the embodiment of the invention, the bending strength of the glass can be improved and the possibility of occurrence of bending cracks can be reduced by adjusting the surface compressive stress of the ultrathin glass 2. For example, in order to make the surface compressive stress of the ultra-thin glass 2 meet the above requirements, in the process of manufacturing the ultra-thin glass, the ion exchange method may be used to process the ultra-thin glass so as to form the compressive stress on the surface of the ultra-thin glass 2 and generate the tensile stress inside the ultra-thin glass, so that an even and regularly distributed internal stress may be generated in the ultra-thin glass 2, thereby improving the impact strength and stability of the ultra-thin glass 2. Moreover, with the arrangement, when the ultra-thin glass 2 bears external force, the external force can be offset with the surface compressive stress at first, which is equivalent to improving the bearing capacity of the ultra-thin glass 2 to the external force, eliminating or inhibiting the expansion of microcracks, and further improving the bending resistance and mechanical strength of the ultra-thin glass.
In the embodiment of the present invention, the ion exchange refers to immersing the ultra-thin glass containing alkali metal ions with small radius in an alkali salt solution with large radius at a certain temperature, for example, 400 ℃, so that the ions with small radius in the surface layer of the ultra-thin glass exchange with the ions with large radius in the solution (for example, lithium ions in the ultra-thin glass exchange with potassium or sodium ions in the solution, and sodium ions in the ultra-thin glass exchange with potassium ions in the solution), and the large ions diffused to the surface of the ultra-thin glass occupy the positions of the small ions in the surface layer of the ultra-thin glass, so that the surface volume of the ultra-thin glass expands to generate a crowding phenomenon, thereby generating a compressive stress layer with large stress on the surface of the ultra-thin glass. That is, the use of the ion exchange method can form a compressive stress on the surface layer of the ultra-thin glass by utilizing the difference in volume of alkali ions. By adopting the method, the quantity of the large ions which are squeezed into the surface layer of the ultrathin glass is in direct proportion to the surface layer compressive stress, and in the embodiment of the invention, the quantity of ion exchange and the depth of the exchanged surface layer can be controlled by adjusting parameters such as temperature, time, additives and the like of ion exchange, so that the effects of obviously improving the strength of the ultrathin glass, effectively eliminating microcracks or inhibiting the expansion of the microcracks and improving the impact resistance and the bending performance of the ultrathin glass are achieved.
Alternatively, as shown in fig. 13, fig. 13 is an enlarged schematic view of an end portion of the ultra-thin glass sub-plate provided with the second organic protective layer, a side surface 200 of the ultra-thin glass sub-plate 20 includes a groove 300, a concave direction of the groove 300 faces the ultra-thin glass sub-plate 20, and a gentle connection portion 310 is provided between two opposite side surfaces of the groove 300 and between two adjacent grooves 300. In the embodiment of the present invention, the surface of the gentle connection portion 310 has a large curvature at any position and there is no position where the curvature is too small and sharp. The provision of the gentle connection portion 310 may improve the impact strength of the side 200 of the ultra-thin glass sub-panel 20. In the embodiment of the invention, the groove 300 is arranged on the side surface 200 of the ultra-thin glass sub-plate 20, so that the second organic protective layer 32 attached to the side surface 200 of the ultra-thin glass sub-plate 20 can be embedded into the groove 300, and the contact area between the groove 300 and the ultra-thin glass sub-plate 20 can be increased. In addition, due to the arrangement, the ultra-thin glass sub-panel 20 and the second organic protection layer 32 can form a locking structure, when the ultra-thin glass sub-panel 20 is used in the foldable display device 100, the second organic protection layer 32 and the ultra-thin glass sub-panel 20 can be prevented from being displaced in the process of using the foldable display device 100, and the reliability of the foldable display device 100 is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (16)
1. A method of making a foldable display device, comprising:
providing a foldable display panel and an ultrathin glass mother board; the ultrathin glass mother board is provided with a first surface and a second surface which are oppositely arranged along the thickness direction of the ultrathin glass mother board;
forming a first organic protective layer on a first surface of the ultrathin glass mother board, wherein the first organic protective layer is in contact with the first surface and covers the first surface;
cutting the ultrathin glass mother board formed with the first organic protection layer to obtain an ultrathin glass daughter board, wherein the cutting surface of the ultrathin glass daughter board is intersected with the first surface and the second surface;
and the ultrathin glass sub-plate is attached to the light emergent side of the foldable display panel, wherein the first surface is positioned on one side of the second surface close to the foldable display panel.
2. The method of manufacturing of claim 1, wherein the ultra-thin glass sub-sheet includes a bending region, the method further comprising:
forming a second organic protective layer in contact with the cutting surface of the ultrathin glass sub-plate in the bending area;
will the ultra-thin glass daughter board laminating in foldable display panel's light-emitting side includes:
and enabling the bending area of the ultrathin glass sub-plate to correspond to the bending area of the foldable display panel.
3. The production method according to claim 2,
the second organic protective layer surrounds the cutting surface of the ultrathin glass sub-plate.
4. The production method according to claim 2,
forming a second organic protective layer in the bending area, wherein the second organic protective layer is in contact with the cutting surface of the ultrathin glass daughter board, and the second organic protective layer comprises:
forming an organic material in contact with the cutting surface of the ultrathin glass daughter board in the bending area by ink-jet printing or coating;
and annealing the ultrathin glass sub-plate formed with the organic material to form a second organic protective layer in contact with the cutting surface of the ultrathin glass sub-plate in the bending area.
5. The method of manufacturing according to claim 2, wherein the ultra-thin glass sheet has a first edge and a second edge, the first edge being an intersection of the first surface and the cutting surface, the second edge being an intersection of the second surface and the cutting surface; the preparation method further comprises the following steps:
forming a third organic protective layer covering the second edge of the ultra-thin sub-glass plate;
the width d of the third organic protective layer is more than or equal to 0.3mm and less than or equal to 2 mm.
6. The production method according to claim 5,
the second organic protective layer and the third organic protective layer are formed by the same process.
7. The production method according to claim 2,
cutting the ultrathin glass mother board formed with the first organic protection layer to obtain the ultrathin glass daughter board, and before the bending area forms a second organic protection layer in contact with a cutting surface of the ultrathin glass daughter board, the method further comprises:
and corroding the cutting surface of the ultrathin glass daughter board.
8. A foldable display device, comprising:
a foldable display panel;
the ultrathin glass sub-plate is positioned on the light emergent side of the foldable display panel; the ultra-thin glass sub-plate is provided with a first surface, a second surface and a side surface; the first surface and the second surface are oppositely arranged, and the first surface is positioned at one side of the second surface close to the foldable display panel; the side surface intersects the first surface and the second surface;
a first sub-organic protection layer in contact with the first surface and covering the first surface.
9. The foldable display device of claim 1,
the ultrathin glass daughter board comprises a bending area;
the foldable display device further comprises a second organic protective layer located in the bending region and in contact with the side surface.
10. The foldable display device of claim 9,
the second organic protective layer surrounds the side face of the ultrathin glass sub-plate.
11. The foldable display device of claim 9,
the ultrathin glass daughter board comprises a first edge and a second edge, wherein the first edge is an intersection line of the first surface and the side surface, and the second edge is an intersection line of the second surface and the side surface;
the foldable display device further comprises a third organic protective layer covering the second edge of the ultra-thin glass: the width d of the third organic protective layer is more than or equal to 0.3mm and less than or equal to 2 mm.
12. The foldable display device of claim 11,
the second organic protective layer and the third organic protective layer include a black light-shielding material.
13. The foldable display device of claim 8,
the first organic protective layer includes a transparent material.
14. The foldable display device of claim 8,
the thickness T1 of the ultrathin glass sub-plate meets the condition that T1 is more than or equal to 20 mu m and less than or equal to 100 mu m;
the thickness T2 of the first sub organic protective layer satisfies 5 μm T2 20 μm.
15. The foldable display device of claim 8,
the surface compressive stress sigma of the ultrathin glass daughter board meets the condition that sigma is more than or equal to-500 MPa and less than or equal to 1000 MPa.
16. The foldable display device of claim 8,
the side of ultra-thin glass daughter board includes the recess, the sunken orientation of recess ultra-thin glass daughter board, gentle connecting portion have between two relative sides of recess.
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