CN110289271B - Flexible display substrate film, manufacturing method thereof and display device - Google Patents

Flexible display substrate film, manufacturing method thereof and display device Download PDF

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Publication number
CN110289271B
CN110289271B CN201910600615.0A CN201910600615A CN110289271B CN 110289271 B CN110289271 B CN 110289271B CN 201910600615 A CN201910600615 A CN 201910600615A CN 110289271 B CN110289271 B CN 110289271B
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film
glass
glass film
plastic
plastic film
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CN110289271A (en
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赵景罡
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Zhejiang Dongfang Kemai Electronics Co ltd
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Dalian Dke Lcd Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1218—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or structure of the substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1259—Multistep manufacturing methods
    • H01L27/1262—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/02—2 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7244—Oxygen barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays

Abstract

The invention discloses a flexible display substrate film, a manufacturing method thereof and a display device, wherein the flexible display substrate film comprises the following components: a glass film; the upper surface of the glass film is provided with a plurality of convex parts; a plastic film covering the glass film; the lower surface of the plastic film is provided with a plurality of concave parts for accommodating the convex parts; the plurality of convex parts are transversely arranged, longitudinally arranged or arranged in an array on the upper surface of the glass film; the invention has simple manufacturing process and excellent gas barrier property. In order to avoid the generation of fracture or crack of the glass film caused by mechanical impact and thermal impact, the falling resistance and the impact resistance of the flexible display substrate film are obviously improved by reducing the weight of the flexible display substrate film and utilizing the buffer shock absorption of the plastic film.

Description

Flexible display substrate film, manufacturing method thereof and display device
Technical Field
The invention relates to a flexible display substrate film, a manufacturing method thereof and a display device.
Background
In recent years, driven by the demand for mobile terminal Display devices, televisions, and the like, Liquid Crystal Display devices (LCDs), Organic Light-emitting Diode Display devices (OLEDs), Electronic paper Display devices (E-paper), and the like have been advancing in the thinning, weight reduction, and flexibility of Display screens. Currently, a substrate film having both flexibility and impact resistance is essential for curved display of a large panel in which realistic reality is sought, and for flexibility of a mobile terminal device in which portability, convenience, and safety are sought.
The substrate widely used by the flat panel display screen in the prior art is a glass substrate; when a flexible display is realized by providing a flexible function to a glass substrate, it is possible to reduce the thickness of the substrate so that the substrate has a flexible characteristic. When the thickness of the glass substrate is less than or equal to 0.1mm, the glass substrate has the characteristics of a bendable substrate film, namely the glass film has a certain degree of flexibility similar to a plastic film. However, the glass thin film still causes the following serious problems: the glass substrate film is easy to crack in the manufacturing process of the display screen due to the weak bending degree and the weak impact resistance, the display screen is easy to crack in the using process, especially the instant over-bending easily causes hidden defects of the glass film, and cracks are generated in the subsequent processing and using processes. Therefore, it is also one of important research directions to use a plastic film having excellent impact resistance, light weight, and excellent flexibility as a film for a display substrate instead of a glass substrate film. However, if only the plastic film is used, the adverse effect of the thermal deformation of the film on the display is difficult to avoid, and the performance requirements of the display screen on the oxygen and water vapor barrier properties of the film (such as oxygen barrier property and water vapor barrier property) are not satisfied. As such, the conventional method is to vapor-plate a film layer made of inorganic material on the plastic film, which has high cost and unsatisfactory effect, and is not favorable for reducing the cost of the display and prolonging the service life of the display, thereby preventing the flexible display from being widely applied. In order to improve the oxygen and moisture barrier properties of plastic films, japanese patent laid-open No. 2004-82598 proposes a gas barrier laminate in which a metal oxide film and an organic material layer are laminated on a substrate, which is one of typical practices, but in an organic electroluminescent display device requiring oxygen and moisture barrier properties, the gas barrier properties of the laminate used in the above japanese patent are still insufficient; it is thus naturally thought that a flexible film having excellent flexibility and excellent gas barrier properties can be realized by stacking a plurality of layers, for example, a flexible film comprising an inorganic glass and resin layer substrates disposed on both sides of the inorganic glass, respectively, and an inorganic film disposed on one side of one of the resin layer substrates on which the inorganic glass is not disposed, the inorganic film being formed on at least one side peripheral edge portion of the corresponding resin layer substrate; however, such overlapping films still present problems: when the glass film is too thin, the impact resistance is insufficient and defects are liable to occur, and when the glass film is too thick, the bendability is remarkably reduced. Therefore, the strength problem that the flexibility and impact resistance of the bendable substrate film are insufficient and further defects are easily generated cannot be solved by simply overlapping a glass film, a plastic film or a coating film.
Disclosure of Invention
In view of the above problems, the present invention has been made to develop a flexible display substrate film having excellent flexibility and gas barrier properties, a method for manufacturing the same, and a display device.
The technical means of the invention are as follows:
a flexible display substrate film, comprising:
a glass film; the upper surface of the glass film is provided with a plurality of convex parts;
a plastic film covering the glass film; the lower surface of the plastic film is provided with a plurality of concave parts for accommodating the convex parts;
furthermore, the plurality of convex parts are transversely arranged, longitudinally arranged or arranged in an array on the upper surface of the glass film;
further, when a plurality of protrusions are arranged on the upper surface of the glass film in a transverse direction or a longitudinal direction, the protrusions are arranged within a predetermined distance range from the edge of the glass film; when the plurality of protrusions are arranged on the upper surface of the glass film in an array manner, edge protrusions are arranged within a preset distance range from the edge of the glass film;
further, when a plurality of convex portions are arranged laterally or longitudinally on the upper surface of the glass thin film, the convex portions have a semi-cylindrical shape, a triangular prism shape, a quadrangular prism shape, a rectangular parallelepiped shape or a square shape; when the plurality of convex parts are arranged on the upper surface of the glass film in an array manner, the convex parts are in a quadrangular pyramid shape, a quadrangular frustum pyramid shape, a spherical crown shape or a square shape;
further, the plastic film has: a cover portion disposed opposite to an upper surface of the glass film and an edge portion disposed opposite to a side surface of the glass film;
further, the air conditioner is provided with a fan,
the height of the convex part and the depth of the concave part are both less than or equal to 100 mu m; the thickness of the glass film excluding the convex part is less than or equal to 100 μm;
the flexible display substrate film further comprises:
electrodes arranged on the lower surface of the glass film and/or the upper surface of the plastic film;
a thin film transistor disposed on the lower surface of the glass film and/or the upper surface of the plastic film;
further, the width of the edge portion is greater than 100 μm; the thickness of the cover portion excluding the recess portion is 400 μm or less; the surface waviness of the glass film is less than or equal to 0.5 mu m/20 mm; the surface roughness of the plastic film is less than or equal to 2 nm.
A method for manufacturing a flexible display substrate film is used for manufacturing the flexible display substrate film and comprises the following steps:
forming a glass film having a plurality of protrusions on an upper surface thereof by a rolling method or an etching method;
carrying out laser cutting on the formed glass film to obtain the glass film with the required size;
cleaning and drying the glass film and the plastic film;
coating a plastic film on the glass film;
compounding the glass film and the plastic film into a whole by using a laminating method; the heating temperature when laminating is carried out is higher than the softening point temperature of the plastic film and lower than the softening point temperature of the glass film;
and carrying out laser cutting on the plastic film compounded with the glass film to obtain the edge part with the required size.
A display device having the flexible display substrate film of any one of the above;
the display device is a liquid crystal display device, an organic light emitting diode display device or an electronic paper display device.
Due to the adoption of the technical scheme, the flexible display substrate film, the manufacturing method thereof and the display device provided by the invention have the advantages of simple manufacturing process and excellent gas barrier property. In order to avoid the generation of fracture or crack of the glass film caused by mechanical impact and thermal impact, the falling resistance and the impact resistance of the flexible display substrate film are obviously improved by reducing the weight of the flexible display substrate film and utilizing the buffer shock absorption of the plastic film. The edge of the glass film is provided with the bulge, and the plastic film is used for wrapping, so that the edge defect is effectively avoided. The design of the convex part of the glass film and the concave part of the plastic film can effectively avoid the over-bending defect and improve the thermal shock resistance and mechanical shock resistance of the flexible display substrate film; meanwhile, the glass film can play a role in resisting water vapor and oxygen; when the plastic film is used as an inner surface, oxygen and moisture permeating from the edge of the plastic film are reduced or largely blocked because the projections or the edge projections provided at the edge of the glass film are designed to be reduced or largely blocked, and the flexible display substrate film also has gas barrier properties similar to those of the glass substrate film. The invention does not need vacuum coating, and can realize low-cost manufacture of the flexible display device. Compared with a pure glass film, the flexible organic electroluminescent display device has better bending performance and display performance with the same service life, and is particularly suitable for manufacturing an organic electroluminescent display device with long service life; the convex portions of the glass film and the concave portions of the plastic film can suppress thermal expansion of the plastic film having a high linear expansion coefficient, and the glass film is used as a display reference surface, thereby obtaining a display substrate film having a small linear expansion coefficient. In general, the breakage of a glass film is caused by a minute defect on the surface due to stress concentration, and the breakage is more likely to occur when the thickness of the glass film is reduced, so that the glass film is difficult to be thinned. In summary, the gas barrier property of the display substrate film can be achieved without a complicated film structure, and the defects of the glass film can be avoided, so that the resistance to the manufacturing process environment is improved, and the manufacturing cost is low.
Drawings
FIG. 1 is a schematic diagram of a structure of a display substrate film according to the present invention;
fig. 2 is a schematic view showing a structure of a display substrate film according to an embodiment of the present invention;
FIG. 3 is a schematic view showing the structure of a glass thin film according to an embodiment of the present invention;
fig. 4 is a schematic view showing a structure of a display substrate film according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the structure of a glass thin film according to an embodiment of the present invention;
FIG. 6 is a schematic view showing the structure of a glass thin film according to an embodiment of the present invention;
FIG. 7 is a schematic view showing the structure of a glass thin film according to an embodiment of the present invention;
fig. 8 is a schematic view showing a structure of a display substrate film according to an embodiment of the present invention;
FIG. 9 is a schematic view showing the structure of a glass thin film according to an embodiment of the present invention;
fig. 10 is a flow chart of a manufacturing method of the present invention.
In the figure: 1. glass film, 2, plastic film, 10, protrusion, 11, edge protrusion, 20, recess, 21, cover portion, 22, edge portion, 23, support protrusion.
Detailed Description
A flexible display substrate film as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, and fig. 9, comprising: a glass film 1; the upper surface of the glass film 1 is provided with a plurality of convex parts 10; a plastic film 2 for coating the glass film 1; the lower surface of the plastic film 2 is provided with a plurality of concave parts 20 for accommodating the convex parts 10; further, a plurality of the convex parts 10 are transversely arranged, longitudinally arranged or arranged in an array on the upper surface of the glass film 1; further, when a plurality of convex portions 10 are arranged in a lateral direction or a longitudinal direction on the upper surface of the glass film 1, the convex portions 10 are arranged within a predetermined distance range from the edge of the glass film 1; when the plurality of protrusions 10 are arranged in an array on the upper surface of the glass film 1, edge protrusions 11 are arranged within a predetermined distance range from the edge of the glass film 1; further, when a plurality of convex portions 10 are arranged laterally or longitudinally on the upper surface of the glass thin film 1, the convex portions 10 have a semi-cylindrical shape, a triangular prism shape, a quadrangular prism shape, a rectangular parallelepiped shape or a square shape; when the plurality of convex parts 10 are arranged on the upper surface of the glass film 1 in an array manner, the convex parts 10 are in a quadrangular pyramid shape, a quadrangular frustum shape, a spherical crown shape or a square shape; further, the plastic film 2 has: a cover portion 21 disposed opposite to the upper surface of the glass film 1 and an edge portion 22 disposed opposite to the side surface of the glass film 1; further, the height of the convex portion 10 and the depth of the concave portion 20 are both less than or equal to 100 μm; the thickness of the glass film 1 excluding the convex portion 10 is 100 μm or less; the flexible display substrate film further comprises: electrodes arranged on the lower surface of the glass film 1 and/or the upper surface of the plastic film 2; a thin film transistor disposed on the lower surface of the glass film 1 and/or the upper surface of the plastic film 2; further, the width of the edge portion 22 is greater than 100 μm; the thickness of the cover part 21 excluding the recess part 20 is 400 μm or less; the surface waviness of the glass film 1 is less than or equal to 0.5 mu m/20 mm; the surface roughness of the plastic film 2 is less than or equal to 2 nm; fig. 1 is a schematic structural diagram of a display substrate film according to the present invention, and the pattern filling portions in fig. 1 respectively show a concave portion 20 on a plastic film 2 and a convex portion 10 on a glass film 1.
A method for manufacturing a flexible display substrate film as shown in fig. 10 is used to manufacture the flexible display substrate film, and includes the following steps:
forming a glass film 1 having a plurality of protrusions 10 on the upper surface thereof by a rolling method or an etching method;
carrying out laser cutting on the formed glass film 1 to obtain the glass film 1 with the required size;
cleaning and drying the glass film 1 and the plastic film 2;
coating the plastic film 2 on the glass film 1;
compounding the glass film 1 and the plastic film 2 into a whole by a laminating method; the heating temperature for laminating is higher than the softening point temperature of the plastic film 2 and lower than the softening point temperature of the glass film 1;
the plastic film 2 laminated with the glass film 1 is laser cut to obtain an edge portion 22 of a desired size.
A display device having the flexible display substrate film of any one of the above;
the display device is a liquid crystal display device, an organic light emitting diode display device or an electronic paper display device.
The bending performance of the flexible display substrate film provided by the invention has a direct relation with the material of the glass film 1, the material of the plastic film 2, the thickness of the glass film 1, the thickness of the plastic film 2, the shape of the convex part 10 and the distribution density of the convex part 10, and particularly, for the glass film 1, the thicker the glass film 1 is, the more difficult the glass film is to bend, the heavier the glass film is, and meanwhile, the dominant defect and the recessive defect are not easily generated after the glass film is impacted by external force; it is not necessary to increase the thickness of the glass film 1 for improving the gas barrier property because even the glass film 1 having a thickness of 1 μm has a very high gas barrier ability; although increasing the distribution density of the protrusions 10 on the glass film 1 increases the weight of the glass film 1 as well as increasing the thickness of the glass film 1, the influence of this on the flexibility of the display substrate film is relatively limited; for the plastic film 2, the weight will also increase when the thickness of the plastic film 2 is increased, but it is beneficial to improve the mechanical impact resistance of the glass film 1, and the water-blocking performance and oxygen-blocking performance will be improved, because the glass film 1 has sufficient gas-blocking performance and water-blocking performance, the thickness of the plastic film 2 only considers the characteristic of mechanical impact resistance; in addition, the increase in the thickness of the plastic film 2 will result in a decrease in the transmittance of the display substrate, which will offset the efforts of the flexible display substrate film to reduce the thickness of the display device. In summary, in order to improve the water blocking performance and the gas barrier performance of the display substrate film, the requirement can be met only by using a thin glass film 1, and the flexibility of the glass film 1 is gradually good along with the reduction of the thickness, but if the glass film 1 and the plastic film 2 are simply overlapped, the generation of the dominant defect or the recessive defect is difficult to avoid, because factors such as thermal shock, the expansion rate difference between the glass film 1 and the plastic film 2, the stress accumulation of the glass film 1, the elasticity difference between the glass film 1 and the plastic film 2 during bending and the like are difficult to avoid the generation of the crack defect besides the mechanical force impact. The bulge part 10 is arranged on the surface of the glass film 1, so that the local thickness of the glass film 1 is increased, and the glass film 1 has the strength similar to that of a thicker glass film 1 when the glass film 1 resists external force impact and thermal impact; the convex part 10 on the glass film 1 is accommodated in the concave part 20 on the plastic film 2 to form an embedded structure, which is beneficial to reducing the displacement caused by the difference of the expansion rate, releasing the stress of the glass film 1, preventing the stress from being excessively accumulated, making up the elasticity difference between the glass film 1 and the plastic film 2 during bending and avoiding the generation of peeling force.
The convex parts 10 are transversely arranged, longitudinally arranged or arranged in an array on the upper surface of the glass film 1; the convex portion 10 is in a shape of a quadrangular pyramid, a quadrangular frustum, a spherical crown, a semi-cylindrical shape, a triangular prism, a quadrangular prism, a rectangular parallelepiped or a square. The following description is given of the effect of different specific structures of the protruding portion 10 on the bending performance of the display substrate film:
fig. 2 is a schematic view showing a structure of a display substrate film according to an embodiment of the present invention, and fig. 3 is a schematic view showing a structure of a glass film 1 according to an embodiment of the present invention; as shown in FIGS. 2 and 3, in a preferred embodiment, the convex portions 10 of the glass thin film 1 are triangular prisms, preferably triangular prisms having a longitudinal section of an isosceles triangle, and the plurality of convex portions 10 are arranged laterally on the upper surface of the glass thin film 1, assuming that the thickness of the portion of the glass thin film 1 excluding the convex portions 10 is tgThe thickness of the plastic film 2 excluding the recess 20 is tpWhen the height of the projection 10 and the depth of the depression 20 are h, the display is basicTotal thickness t ═ t of the sheet filmg+tp+ h, the center-to-center spacing between adjacent bosses 10 is W, and the maximum width of the bosses 10 is WgThe maximum width W of the supporting protrusions 23 between adjacent recesses 20 on the plastic film 2pThe radius of curvature of the convex portion 10 is RgThe radius of curvature of the supporting protrusions 23 between the adjacent recesses 20 is RpUsually, the curvature radius of the flexible display substrate film is larger than that of the plastic film 2, i.e. R ≧ Rp(ii) a The display substrate film of the invention has longitudinal flexibility
Figure BDA0002119164360000071
When the display substrate film is bent toward the plastic film 2 side (when the glass film 1 is at the lower side and the plastic film 2 is at the upper side, the display substrate film is bent upward), the radius of curvature of the convex portion 10 is set to be as small as possible, provided that the plastic film 2 can be freely compressed
Figure BDA0002119164360000072
Similarly, the radius of curvature of the convex portion 10 when the display substrate is bent toward the glass film 1 side (assuming that the glass film 1 is under and the plastic film 2 is over, this means that the display substrate is bent downward); in that
Figure BDA0002119164360000073
When neglecting the presence of the glass film 1, the radius of curvature of the supporting protrusions 23 of the plastic film 2 disposed between the adjacent recesses 20 is
Figure BDA0002119164360000074
If W isp＝WgThe supporting protrusions 23 of the plastic film 2, which are disposed between adjacent recesses 20, have the same radius of curvature as the protrusions 10, which is mainly the result of neglecting material deformation purely from the geometric considerations of the protrusions 10. In fact, R is due to the large elastic deformation range of plasticspIn practical application, the curvature radius of the plastic film 2 is far smaller than that of the glass film 1, so that the plastic film 2 does not influence the bending of the glass film 1, such asThe fruit bulge 10 has a bulge height of 1 μm or 100 μm]Maximum width (side length of isosceles triangle) W of projection 10gBelongs to [1 μm, 100 μm ]]The radius of curvature R of the convex portion 10gRadius of curvature R of support projection 23pAre all less than 120 mu m, which is much less than the curvature radius (millimeter magnitude) of the glass film 1 with the thickness of 100 mu m, so the arrangement of the convex parts 10 does not affect the bending property of the glass film 1, and the support protrusions 23 between the adjacent concave parts 20 do not affect the bending property of the plastic film 2; when the display substrate film is bent towards one side of the plastic film 2, due to the existence of the plastic film 2, under the condition that the plastic deformation of the plastic film 2 is neglected after the bending, the supporting protrusions 23 between the adjacent concave parts 20 on the plastic film 2 play a role in supporting the glass film 1, and the glass film 1 is ensured not to be excessively bent; similarly, when the display substrate film is bent towards the glass film 1 side, the glass film 1 is provided with the convex part 10, and the plastic deformation of the glass film 1 can be ignored, so that when the display substrate film is bent towards the glass film 1 side, the convex part 10 on the glass film 1 has a supporting effect on the plastic film 2, and the flexible display substrate film can not be excessively bent, thereby ensuring that the glass film 1 does not generate defects. When in use
Figure BDA0002119164360000075
And Wp>WgWhen the display substrate film is bent, the supporting protrusions 23 on the plastic film 2 are easily peeled from the protrusions 10 of the glass film 1 due to the characteristics of the plastic film 2, the expansion coefficient of the plastic film 2 is not effectively inhibited, the combination between the glass material and the plastic material is not firm, and the stress release of the glass film 1 is not facilitated; when W isp<WgThis corresponds to the case of a simple lamination of the plastic film 2 and the glass film 1, which has undesirable consequences and which has already been explained above and will not be described again here, and is therefore not described again
Figure BDA0002119164360000081
And Wp<WgThe condition of the parameters (2) is to be avoided, the bending effect is influenced by the overlarge convex part 10 on the glass film 1, and the weight of the display substrate film is increased; when the plurality of convex portions 10 are arranged in the longitudinal direction on the upper surface of the glass film 1, the explanation process is the same as that of the plurality of convex portions 10 arranged in the lateral direction except for the bending direction of the display substrate film.
FIG. 4 is a schematic view showing a structure of a display substrate film according to an embodiment of the present invention, FIG. 5 is a schematic view showing a structure of a glass film 1 according to an embodiment of the present invention, and as shown in FIGS. 4 and 5, in a preferred embodiment, when a convex portion 10 is in a quadrangular shape, preferably a quadrangular shape having a longitudinal section of an isosceles trapezoid, and a plurality of convex portions 10 are arranged in a lateral direction on an upper surface of the glass film 1, it is assumed that an upper base width of the isosceles trapezoid is Wg0The minimum width W of the supporting protrusions 23 between adjacent recesses 20 on the plastic film 2p0The flexible display substrate film has longitudinal (vertical) flexibility when
Figure BDA0002119164360000082
When the display substrate film is bent toward the plastic film 2, the center-to-center distance between the adjacent protrusions 10 is W, and the maximum width (the width of the lower base of the isosceles trapezoid) of the protrusions 10 is WgThe maximum width W of the supporting protrusions 23 between adjacent recesses 20 on the plastic film 2pThe radius of curvature of the convex portion 10 is RgThe radius of curvature of the supporting protrusions 23 between the adjacent recesses 20 is RpThe radius of curvature of the convex portion 10 of the glass film 1 is set regardless of the presence of the plastic film 2
Figure BDA0002119164360000083
Similarly, the display substrate film can be analyzed as if it is bent toward the glass film 1 side
Figure BDA0002119164360000084
While neglecting the glassThe radius of curvature of the support protrusions 23 on the plastic film 2 in the presence of the glass film 1
Figure BDA0002119164360000085
If W isp＝WgThe above description, which is based on the assumption that the support protrusions 23 on the plastic film 2 and the protrusions 10 on the glass film 1 have the same radius of curvature, is based on the assumption that deformation is neglected, and is based on the assumption that the geometric considerations are only given. In practice, plastic materials have a large elastic deformation range, so RpIn practical application, the curvature radius of the glass film 1 is much smaller than that of the glass film 1, if the protrusion height of the protrusion 10 is 1 μm, 100 μm]Maximum width (lower base width of isosceles trapezoid) W of projection 10gBelongs to [1 μm, 100 μm ]]，Wp0Equal to 50 μm, then RgAnd RpRespectively less than 290 micrometers, which is much smaller than the curvature radius (millimeter magnitude) of the glass film 1 with the thickness of 100 μm, the arrangement of the convex portions 10 does not affect the bending property of the glass film 1 itself, and the support protrusions 23 between the adjacent concave portions 20 do not affect the bending property of the plastic film 2 itself; when the display substrate film is bent towards one side of the plastic film 2, due to the existence of the plastic film 2, under the condition that the plastic deformation of the plastic film 2 is neglected after the bending, the supporting protrusions 23 between the adjacent concave parts 20 on the plastic film 2 play a role in supporting the glass film 1, and the glass film 1 is ensured not to be excessively bent; similarly, when the display substrate film is bent towards the glass film 1 side, the glass film 1 is provided with the convex part 10, and the plastic deformation of the glass film 1 can be ignored, so that when the display substrate film is bent towards the glass film 1 side, the convex part 10 on the glass film 1 has a supporting effect on the plastic film 2, the flexible display substrate film can not be excessively bent, and the glass film 1 is ensured not to be defective; from the form of the curvature radius of the display substrate film, the curvature radius of the display substrate film with the protrusion 10 in the shape of a quadrangular prism is larger than that of the display substrate film with the protrusion 10 in the shape of a triangular prism, so that when the bending capability of the glass film 1 is low, the protrusion 10 in the shape of a quadrangular prism is more beneficial to avoiding the excessive bending of the display substrate film; when in use
Figure BDA0002119164360000091
And Wp>WgIn this case, it is advantageous to reduce the weight of the display substrate film, and W is preferablep<2WgThe defect is prevented; the maximum width of the supporting protrusion 23 of the plastic film 2 is greater than the maximum width of the protrusion 10 of the glass film 1, because of the characteristics of the plastic film 2, the bending performance of the plastic film 2 is not affected by the portion 10 of the supporting protrusion 23, and meanwhile, when the size of the protrusion 10 is large, the phenomenon that the supporting protrusion 23 on the plastic film 2 is peeled off from the protrusion 10 of the glass film 1 is easy to occur when the display substrate film is bent, the expansion coefficient of the plastic film 2 is not effectively inhibited, the combination between the glass material and the plastic material is not firm, and the stress release of the glass film 1 is not facilitated; when W isp<WgThis corresponds to the case of a simple lamination of the plastic film 2 and the glass film 1, which has undesirable consequences and which has already been explained above and will not be described again here, and is therefore not described again
Figure BDA0002119164360000092
And Wp<WgThe condition of the parameters (2) is to be avoided, the bending effect is influenced by the overlarge convex part 10 on the glass film 1, and the weight of the display substrate film is increased; when the plurality of convex portions 10 are arranged in the longitudinal direction on the upper surface of the glass film 1, the explanation process is the same as that of the plurality of convex portions 10 arranged in the lateral direction except for the bending direction of the display substrate film.
Fig. 6 is a schematic view showing a structure of a glass film 1 according to an embodiment of the present invention, and as shown in fig. 6, as a preferred embodiment, when the convex portions 10 are in a quadrangular pyramid shape, and preferably, a plurality of convex portions 10 are arranged in an array on the upper surface of the glass film 1, the display substrate film can be bent in both the lateral direction and the longitudinal direction, but the bending effect in other directions is slightly poor, the distribution density of the convex portions 10 is spatially uniform array distribution, that is, the bases of the convex portions 10 in the same direction are parallel, the center distances of the bases of the convex portions 10 are equal, the vertex distances of the convex portions 10 are equal, and the bending uniformity of the display substrate film is ensured. The bending characteristics of the display substrate film in which the convex portions 10 are quadrangular pyramid shaped in the lateral and longitudinal directions are similar to those of the display substrate film in which the convex portions 10 are triangular prism shaped, respectively, and the influence factors are complicated in other bending directions and the bending effect is not good, and it is not suggested that the display substrate film of this embodiment is bent in other directions.
Fig. 7 is a schematic view showing a structure of a glass film 1 according to an embodiment of the present invention, and as shown in fig. 7, as a preferred embodiment, when the protrusions 10 are in a quadrangular frustum shape, and preferably, a plurality of protrusions 10 are arranged in an array on the upper surface of the glass film 1, flexibility is slightly poor, but it is more advantageous to avoid excessive bending of the glass film 1, distribution density of the protrusions 10 is in a spatially uniform array distribution, that is, sides of upper and lower bottom surfaces of each protrusion 10 are parallel, and centers of adjacent upper and lower bottom surfaces of each protrusion 10 are equally spaced and uniformly distributed, thereby ensuring uniformity of bending of the display substrate film. The bending characteristics of the display substrate film in which the convex portions 10 are in the shape of a quadrangular frustum of a pyramid in the lateral direction and the longitudinal direction are similar to those of the display substrate film in which the convex portions 10 are in the shape of a quadrangular pyramid, respectively, and the influence factors are complicated in other bending directions and the bending effect is not good, and it is not recommended that the display substrate film of this embodiment is bent in other directions.
As a preferred embodiment, when the convex portions 10 on the glass film 1 are formed in a semi-cylindrical shape, the bending effect is similar to the case where the convex portions 10 are formed in a triangular prism shape or a quadrangular prism shape, and it is possible to adjust the radius and distribution density of the convex portions 10 during the actual processing of the display substrate film to obtain a satisfactory bending performance. The bending property analysis process of the bump 10 in the preferred embodiment in the lateral arrangement or the longitudinal arrangement on the upper surface of the glass film 1 is the same except that the bending direction of the display substrate film is different.
Fig. 8 is a schematic view showing a structure of a display substrate film according to an embodiment of the present invention, fig. 9 is a schematic view showing a structure of a glass film 1 according to an embodiment of the present invention, and as shown in fig. 8 and 9, as a preferred embodiment, when a convex portion 10 on the glass film 1 is spherical, the convex portion 10 has equal bending ability in any direction, and it is difficult to quantitatively analyze a curvature radius of the convex portion 10. The bending characteristics of the display substrate film in the longitudinal or transverse direction are similar to those of the display substrate film in which the convex portions 10 are semi-cylindrical, and the radius and distribution density of the convex portions 10 can be adjusted to obtain satisfactory bending performance in the actual processing of the display substrate film.
When the glass films are arranged in an array, the number of the convex parts 10 distributed on the edge area of the upper surface of the glass film 1 is more than that of the convex parts 10 distributed on the non-edge area of the upper surface of the glass film 1; the weakest region of the glass film 1 and the region where defects are most likely to occur are within an area extending several millimeters inward from the edge region of the glass film 1, and the purpose of providing the convex portion 10 in this region is to prevent edge defects and effectively reduce the occurrence of various defects. The shape of the convex part 10 can be designed into a triangle, a trapezoid, an arc, a semicircle or a semi-ellipse according to the actual situation; when the sum of the thickness of the glass film 1 and the height of the convex portions 10 is greater than 0.1mm, in order not to affect the bending property, the plurality of convex portions 10 arranged in the edge region of the glass film 1 and the plurality of convex portions 10 arranged in the non-edge region (inner region) of the glass film 1 are kept consistent in the bending direction and the arrangement density; when the plurality of convex portions 10 are arranged longitudinally or transversely, the edge region of the glass film 1 is ensured to have the convex portions 10, and bending characteristics are preferentially ensured to withstand the impact force. When the plurality of protrusions 10 are arranged in an array, it is ensured that the number of the protrusions 10 distributed in the edge region is greater than the number of the protrusions 10 distributed in the non-edge region, so that the flexibility is preferentially ensured and the impact resistance is low. When the sum of the thickness of the glass film 1 and the protrusion height of the protrusion 10 is greater than 0.1mm, the flexibility is high, the edge of the glass film 1 can be designed to be completely closed or mostly closed, the structural form of the internal protrusion 10 does not need to be considered, and the display substrate film has stronger capability of resisting edge impact and is only weaker in bending property.
In a preferred embodiment, the height of the protrusions 10 and the depth of the depressions 20 are both less than or equal to 100 μm; the higher the height of the protrusions 10 on the glass film 1, the more advantageous it is to maintain the mechanical stability of the glass film 1 itself, the less flexible it is, the heavier it is, the supporting protrusions 23 between adjacent recesses 20 on the plastic film 2 serve to support the glass film 1, and the thicker the supporting protrusions 23, the stronger the supporting function.
In a preferred embodiment, the thickness of the glass thin film 1 excluding the convex portion 10 is 100 μm or less. Experiments prove that various alkali glass or alkali-free glass has good bending property when the thickness is less than 100 mu m.
As a preferred embodiment, the plastic film 2 comprises a covering part 21 opposite to the glass film 1 and two edge parts 22 respectively arranged at two sides of the covering part 21, the thickness of the covering part 21 excluding the concave part 20 is less than or equal to 400 μm, and when the covering of the glass film 1 is satisfied, the thinner the plastic film 2 is, the better the transmittance can be increased, and the bending is facilitated; as a preferred embodiment, the width of the edge part 22 is more than 100 μm, the thickness is less than or equal to 600 μm, the thickness of the edge part 22 is equal to the sum of the thickness of the covering part 21 of the plastic film 2 and the thickness of the part of the glass film 1, which does not include the convex part 10, and the arrangement of the edge part wrapping the outer edge of the glass film 1 can effectively reduce the probability of the occurrence of the defects.
As a preferred embodiment, the thickness of the display substrate film is uniform everywhere, i.e. the sum of the thickness of the portion of the glass film 1 excluding the convex portion 10, the convex height of the convex portion 10, and the thickness of the portion of the cover portion 21 excluding the concave portion 20 is equal to the thickness of the display substrate film, and the thickness of the edge portion 22 of the plastic film 2 is equal to the thickness of the display substrate film and is less than or equal to 600 μm; the thinner the thickness of the display substrate film, the better the bendability. Generally, the thickness of the entire display substrate film is reduced by reducing the thickness of the glass film 1, so that the flexibility is improved, the weight of the entire display substrate film is reduced, and the drop resistance is improved. When the thickness of the glass film 1 is only several micrometers, the bending property of the display substrate film is close to that of the plastic film 2, and the gas barrier property is still comparable to that of a general glass substrate. The thickness of the plastic film 2 affects the transmittance of the display substrate film, and when the display substrate film is used as a non-back panel, the thickness of the plastic film 2 is reduced as much as possible, and the transmittance of the whole substrate is improved.
In a preferred embodiment, the glass film 1 has a waviness of 0.5 μm/20mm or less; the surface roughness of the plastic film 2 is less than or equal to 2 nm; when the lower surface of the glass film 1 is taken as a display reference surface, the waviness can be effectively reduced through a grinding mode so as to meet the requirement of display on a substrate film; the plastic film 2 is flexible, and the waviness is easily corrected during the processing, and the surface roughness is a more interesting index than the waviness.
As a preferred embodiment, the display substrate film further includes an electrode disposed on the lower surface of the glass film 1 and/or the upper surface of the plastic film 2; the electrode types are classified into transparent electrodes and non-transparent electrodes. The transparent electrode can be made of ITO material, PEDOT material, carbon nanotube material or graphene material; the non-transparent electrode can be a metal electrode, specifically, a metal electrode such as aluminum, silver, copper, etc.; the electrode is attached to the surface of the glass film 1, so that the high-temperature processing process can be resisted, and the thermal stability of the display substrate film is good; when the temperature changes and the size of the plastic film 2 changes, the geometric size of the electrode is not influenced, the thermal stability is higher, and the resolution of the display device is favorably improved; when the electrode is attached to the surface of the plastic film 2, lower process temperature is needed, but the electrode has very good bending property, and particularly when the electrode made of organic electrode material such as PEDOT material is attached to the surface of the plastic film 2, the electrode has better adhesion force, and the uniformity of the electrode film is good.
As a preferred embodiment, the display substrate film further includes a thin film transistor disposed on the lower surface of the glass film 1 and/or the upper surface of the plastic film 2; the thin film transistor can be selected from organic thin film transistor or inorganic thin film transistor according to the requirement, it is advantageous to arrange it on the side of the glass film 1, the glass film 1 being able to withstand higher temperature treatment processes without deforming, in particular, such as a-Si (amorphous silicon) thin film transistor, p-Si (polycrystalline silicon) thin film transistor, LTPS (low temperature polycrystalline silicon) thin film transistor, IGZO (indium gallium zinc oxide) thin film transistor, etc. arranged on one side of the glass can adapt to the existing process manufacturing environment, if an organic TFT (thin film transistor), namely an OTFT (organic thin film transistor), is adopted, the process manufacturing environment can be met by arranging the organic TFT on one side of the glass film 1 or the plastic film 2, but the organic TFT is arranged on one side of the glass film 1, so that the manufactured active device has good dimensional stability and high uniformity, and is beneficial to realizing a high-resolution display; when the thin film transistor is disposed on the upper surface of the plastic film 2 and an inorganic thin film transistor is used, in order to meet the requirement of a high temperature manufacturing process, the plastic film 2 needs to select a high temperature resistant material such as a PI film or a PEN film, and at the same time, certain adjustment needs to be made in the manufacturing process to meet the requirement of material thermal stability.
The invention also provides a display device, which comprises the flexible display substrate film in any one of the embodiments; preferably, the display device may be a liquid crystal display device, an organic light emitting diode display device, or an electronic paper display device; when the display device is a liquid crystal display device, the display device can be manufactured into liquid crystal display devices of different display modes such as TN (twisted nematic), STN (super twisted nematic), IPS, PDLC, Ch-LCD, VA, FLC and the like; the liquid crystal display device of the TN display mode can be divided into a passive type and an active type, when in passive display, one side of the plastic film 2 can be used as the inner surface of the liquid crystal box, one side of the glass film 1 can be used as the inner surface, or one side of the plastic film 2 and one side of the glass film 1 can be respectively used as the inner surfaces, the requirements on the thickness uniformity of the liquid crystal box are not high due to the low temperature of the manufacturing process environment for the combination of the inner surfaces of the liquid crystal box, when in active display, the glass film 1 is preferably used as the inner surface of the liquid crystal box, the manufacturing process environment in the manufacturing process of the liquid crystal box can be met, the expansion rate is low, the precision of an active device can be accurately controlled, and the uniform active device is formed; the STN, PDLC, Ch-LCD, passive VA and passive FLC cells are configured in a manner similar to the passive TN format, while it is advantageous for IPS, active FLC and active VA to use the glass film 1 as an inner surface, such an arrangement is not absolute, if the OTFT or the organic transparent electrode is adopted, the plastic film 2 may be considered as an inner surface of the liquid crystal cell, and two flexible display substrate films of the liquid crystal display device are used, and the bending directions of the two display substrate films are required to be consistent, specifically, if the plurality of protrusions 10 of one display substrate film are longitudinally arranged on the glass film 1, the plurality of protrusions 10 of the other display substrate film are longitudinally arranged or arranged in an array on the glass film 1, and if the plurality of protrusions 10 of one display substrate film are transversely arranged on the glass film 1, the plurality of protrusions 10 of the other display substrate film are transversely arranged or arranged in an array on the glass film 1. In the practical application process, the preferred combination is selected according to the characteristics of the film and the requirements of the manufacturing process environment, which is not detailed here, and no matter which combination is adopted, the flexible display substrate film can achieve the purpose of being flexible, can effectively avoid the defect of excessive bending, and has gas barrier property not inferior to that of a pure glass substrate film liquid crystal box. Preferably, the display device may be an organic light emitting diode display device, and when the display device is an organic light emitting diode display device, it may be fabricated as a top emission or bottom emission display device; organic Light Emitting Diodes (OLEDs) can be classified into two categories, active and passive display, according to the driving principle, and can be classified into two categories, i.e., high molecular materials and small molecular materials, according to the light emitting materials, wherein the passive driving has low requirements on the substrate thin film, and the substrate thin film materials easily meet the display requirements; in addition, the materials constituting the OLED, such as the organic light emitting layer, the hole injection layer, the hole transport layer, the electron injection layer and the like, are all organic materials, are more sensitive to oxygen molecules and water molecules, therefore, the gas barrier property of the display substrate film is required to be very high, and the flexible display substrate film is a very suitable form as described above with reference to the liquid crystal display device, since the OLED uses a single layer of flexible display substrate film, the electrodes and display materials are of a laminated type, the curved form seems easy to achieve, but in fact, the harsh gas barrier requirements, in addition to the display substrate film, protection of the back electrode side usually requires a film or substrate film for protection, the flexible display substrate film not only can be used as a display substrate film, but also can be used as a substrate film for protecting a back electrode, so that the cost is low; the structure of the flexible display substrate film has the performance of a gas barrier film, when the arrangement direction of the convex parts 10 is consistent with the bending direction required by the display substrate film, the bending of the whole OLED display device can be realized, specifically, when the display substrate film requires longitudinal bending, the plurality of convex parts 10 on the glass film 1 can be longitudinally arranged or arranged in an array form, and when the display substrate film requires transverse bending, the plurality of convex parts 10 on the glass film 1 can be transversely arranged or arranged in an array form; the high-efficiency gas barrier property can be realized without a coating process, so that the cost of the OLED display device is reduced. Preferably, the display device may be an electronic paper display device; the flexible display substrate film is used for manufacturing the driving back plate, so that the cost of flexible electronic paper display can be effectively reduced; electronic paper displays are mainly satisfactory for paper replacement, and low cost is a basic requirement. The flexible display substrate film can meet the requirements by using the cheap plastic film 2 and the glass film 1, and creates conditions for the application and popularization of electronic paper.
The invention also provides a method for manufacturing the flexible display substrate film, which is used for manufacturing the flexible display substrate film and comprises the following steps: forming a glass film 1 having a plurality of protrusions 10 on the upper surface thereof by a rolling method or an etching method; carrying out laser cutting on the formed glass film 1 to obtain the glass film 1 with the required size; cleaning and drying the glass film 1 and the plastic film 2; coating the plastic film 2 on the glass film 1; compounding the glass film 1 and the plastic film 2 into a whole by a laminating method; the heating temperature for laminating is higher than the softening point temperature of the plastic film 2 and lower than the softening point temperature of the glass film 1; the plastic film 2 laminated with the glass film 1 is laser cut to obtain an edge portion 22 of a desired size. Preferably, the glass film 1 and the plastic film 2 both use plate-shaped materials, which is beneficial to forming the high-precision convex part 10 and increasing the tight degree of combination of the two materials, and at the same time, even if a small amount of defects exist in the glass film 1 and the plastic film 2, the defects can be automatically repaired in the heating processing process of the manufacturing method; the lamination process does not generally require the use of an adhesive, and the lamination can be performed by simple heating, and when it is difficult to directly bond the plastic film 2 and the glass film 1 to each other, the transparent adhesive bonding can be considered.
The invention has simple manufacturing process, excellent gas barrier property and low cost. Because the thickness of the glass film 1 is convenient to adjust, the weight of the flexible display substrate film is easy to reduce, and the falling resistance and the mechanical impact resistance of the flexible display substrate film are high by utilizing the buffer shock absorption of the film. The bulge part 10 is attached to the surface of the glass film 1, which is equivalent to the fact that the thickness of the glass film 1 is obviously increased, and further the thermal shock resistance of the display substrate film is improved; the edge of the glass film 1 is provided with the bulge part 10, and the plastic film 2 is used for wrapping, so that the edge defect is effectively avoided; the design of the convex part 10 of the glass film 1 and the design of the concave part 20 of the plastic film 2 can effectively avoid the over-bending defect and improve the heat shock resistance and mechanical shock resistance of the flexible display substrate film; meanwhile, the glass film 1 can play a role in blocking water and oxygen. When the plastic film 2 is used as the inner surface, oxygen and moisture permeating from the plastic edge are reduced or mostly blocked due to the design of the edge bulge 11, the gas barrier property of the whole display substrate film is realized, an expensive vacuum plating inorganic film structure is not needed, the defect of the glass film 1 can be avoided, the tolerance to the manufacturing process environment is improved, and the flexible display with low cost can be realized. The manufactured OLED display device has display performance with the same lifetime as that of the single glass thin film 1, and thus is particularly suitable for manufacturing a long-lifetime display device. The convex parts 10 of the glass film 1 and the concave parts 20 of the plastic film 2 can inhibit the thermal expansion of the plastic film 2 with high linear expansion coefficient, thereby obtaining a display substrate film material with small linear expansion coefficient, and being suitable for the application of high-resolution display devices. In general, the fracture of the glass film 1 is caused by a minute defect in which stress is concentrated on the surface, and the fracture is more easily generated when the thickness of the glass film 1 is reduced, so that it is difficult to achieve thinning, and in the display substrate film of the present invention, since the protrusions 10 having an appropriate shape and density are disposed on the surface of the glass film 1, the strength and toughness of the glass film 1 itself are remarkably enhanced, and the plastic film 2 reduces the influence of external force impact, so that the tear stress in the direction toward the defect during deformation is relaxed, and an excellent flexible substrate can be obtained, so that the secondary processability and the workability can be remarkably improved. The invention can avoid the defect of the substrate film caused by excessive bending, has the characteristics of strong rigidity, low expansion rate and good plane ductility, has excellent oxygen and water vapor resistance, can be realized in a non-transparent or transparent mode, is simple to process and manufacture and low in cost, and ensures that the substrate film has the characteristics of high temperature resistance and the like by selecting the high-temperature-resistant plastic film 2 material. The device has low cost and high reliability, can avoid the dominant or recessive defects caused by external force impact, and is firm and durable.
All edges (sides) of the glass film 1 of the invention are surrounded by the plastic film 2; the plastic film 2 and the glass film 1 are combined into a whole by a heating bonding mode or by using a transparent bonding agent, and the surfaces of the glass film 1 and the plastic film 2 are both smooth planes; the glass film 1 is preferably made of alkali glass or alkali-free glass, and the plastic film 2 is preferably made of PET, PEN, TAC, PI, or the like.
The following describes an application example of the display substrate film according to the present invention with reference to specific dimensional parameters of each component, specifically, the glass film 1 (including the protrusions 10) is made of alkali-free glass, and the plastic film 2 is made of PEN material;
as shown in FIGS. 2 and 3, it is preferable that the convex portions 10 have a triangular prism shape and are arranged in the lateral direction on the surface of the glass thin film 1, and the longitudinal section thereof has an isosceles triangular prism shape, the center-to-center distance W between adjacent convex portions 10 is 80 μm, the maximum width of the supporting protrusions 23 between adjacent concave portions 20 is 80 μm, and the maximum width W of the convex portions 10 is 80 μmg80 μm, and the height h of the projection 10 is 100Mu m; when the display substrate film is bent toward the plastic film 2, the radius of curvature R of the convex portion 10 of the glass film 1 is ignored under the condition that the plastic film 2 is ignoredg108 μm, reference when analyzing the bending ability of the glass film 1
Figure BDA0002119164360000162
Glass having a radius of curvature of 180mm for a thickness of 100 μm and a radius of curvature of 370mm for a thickness of 200 μm; radius of curvature R of convex portion 10 of glass film 1g108 μm is small, so the convex portion 10 does not affect the bending property of the glass thin film 1; the support protrusions 23 between adjacent recesses 20 on the plastic film 2 cooperate with the protrusions 10 on the glass film 1 to form a mixed layer having a thickness of about 100 μm, the bending properties of which are mainly determined by the bending ability of the protrusions 10 on the glass film 1. When the display substrate film is bent towards the plastic film 2, the supporting protrusions 23 between the adjacent concave parts 20 on the plastic film 2 play a role of buffering, and under the condition of neglecting the plastic deformation of the plastic film 2, the supporting protrusions 23 of the plastic film 2 play a role of supporting the glass film 1, so that the defect that the glass film 1 is not bent excessively is ensured. Similarly, when the display substrate film is bent toward the glass film 1 side, the display substrate film has longitudinal flexibility, and W ═ W is preferablep＝WgThe plastic film 2 has a radius of curvature of, neglecting the presence of the glass film 1
Figure BDA0002119164360000161
Then obtain RpThe support protrusions 23 on the plastic film 2 and the protrusions 10 on the glass film 1 have the same radius of curvature, 108 μm, which is a conclusion from geometric considerations, based on the assumption that deformation is neglected; in practice, plastic materials have a large elastic deformation range, so RpIn the practical application process, the thickness is far less than 108 μm because of the existence of the convex part 10 on the glass film 1, and the plastic deformation of the glass film 1 can be ignored, when the display substrate film is bent towards one side of the glass film 1, the convex part 10 on the glass film 1 has a supporting effect on the plastic film 2, and the plastic film 2 and the glass film 1 are the sameExcessive bending does not occur, and thus it is ensured that the glass thin film 1 does not generate defects. When the thickness t of the glass film 1 excluding the convex portion 10gA thickness t of 100 μm of the plastic film 2 excluding the recess 20pAt 200 μm, the thickness of the entire display substrate film was 400 μm, and the bendable radius of curvature was determined by the radius of curvature of the glass film 1.
As shown in FIGS. 4 and 5, it is preferable that the convex portions 10 have a quadrangular prism shape and are arranged in the lateral direction on the surface of the glass film 1, and the vertical section of the convex portions is an isosceles trapezoid quadrangular prism shape, and the width W of the upper base of the isosceles trapezoid isg0A center-to-center distance W between the adjacent protrusions 10 of 40 μm and 80 μm, and a maximum width W of the supporting protrusions 23 between the adjacent depressions 20pThe maximum width W of the projection 10 (the width of the lower base of the isosceles trapezoid) is 80 μmgWhen the protrusion height h of the protrusion 10 is 100 μm, the flexible display substrate film has longitudinal flexibility; if preferred, W ═ Wp＝WgWhen the display substrate film is bent toward the plastic film 2 with the existence of the plastic film 2 ignored, the radius of curvature of the glass film 1
Figure BDA0002119164360000171
The curvature radius is larger than the curvature radius 108 μm of the convex portion 10 in the shape of a rhombus, but is much smaller than the curvature radius of the glass film 1 with the thickness of 100 μm, so that the convex portion 10 does not affect the bending performance of the glass film 1; the support protrusions 23 between adjacent recesses 20 on the plastic film 2 cooperate with the protrusions 10 on the glass film 1 to form a mixed layer having a thickness of about 100 μm, the bending properties of which are mainly determined by the bending ability of the protrusions 10 on the glass film 1. The supporting bulges 23 between the adjacent concave parts 20 on the plastic film 2 play a role of buffering, and under the condition of neglecting the plastic deformation of the plastic film 2, the supporting bulges 23 of the plastic film 2 play a role of supporting the glass film 1, thereby ensuring that the glass film 1 does not generate the defect of excessive bending. Similarly, when the display substrate film is bent toward the glass film 1 side, the display substrate film has longitudinal flexibility, and W ═ W is preferablep＝WgNeglecting the presence of the glass film 1Radius of curvature of the plastic film 2
Figure BDA0002119164360000172
Because the bulge part 10 on the glass film 1 exists and the plastic deformation of the glass film 1 can be ignored, when the display substrate film bends towards the glass film 1 side, the bulge part 10 on the glass film 1 has a supporting effect on the plastic film 2, the plastic film 2 can not be excessively bent, and the glass film 1 is ensured not to generate defects. The radius of curvature of the quadrangular prism-shaped convex portion 10 is larger than the radius of curvature of the triangular prism-shaped convex portion 10 in view of the radius of curvature of the display substrate film, so that it is more advantageous to avoid excessive bending of the flexible display substrate film when the glass film 1 has a low bending ability by using the quadrangular prism-shaped convex portion 10. When the thickness t of the glass film 1 excluding the convex portion 10gA thickness t of 100 μm of the plastic film 2 excluding the recess 20pAt 200 μm, the thickness of the entire display substrate film was 400 μm, and the bendable radius of curvature was determined by the radius of curvature of the glass film 1.
As shown in FIG. 6, the protrusions 10 are set to be quadrangular pyramids and arranged in an array on the surface of the glass film 1, the geometrical dimensions of the quadrangular pyramids of the protrusions 10 are 80 μm in length of the lower side and 100 μm in height, the longitudinal center distance or the transverse center distance between the protrusions 10 is 120 μm, the thickness of the glass film 1 excluding the protrusions 10 is 100 μm, the thickness of the plastic film 2 excluding the recesses 20 is 200 μm, and the geometrical dimensions of the recesses 20 of the plastic film 2 are also 80 μm in length of the lower side and 100 μm in height. The thickness of the entire display substrate film was 400 μm, the radius of curvature was determined by the glass film 1, and the optimum bending direction was along the base direction of the rectangular pyramid.
As shown in FIG. 7, the protrusions 10 are assumed to be square truncated pyramid-shaped and arranged in an array on the surface of the glass film 1, the square truncated pyramid geometry of the protrusions 10 is such that the side length of the upper bottom surface is 40 μm, the side length of the lower bottom surface is 80 μm, and the height is 100 μm, the center distance between the upper bottom surfaces of the protrusions 10 is 120 μm, or the center distance between the lower bottom surfaces of the protrusions 10 is 120 μm, the thickness of the glass film 1 excluding the protrusions 10 is 100 μm, the thickness of the plastic film 2 excluding the recesses 20 is 200 μm, the geometric dimension of the recesses 20 of the plastic film 2 is also 40 μm, and the side length of the lower bottom surface is 80 μm, and the height is 100 μm. The thickness of the entire flexible display substrate film was 400 μm, the radius of curvature of the flexible film was determined by the glass film 1, and the optimum direction of bending was along the bottom side of the quadrangular frustum pyramid.
As shown in FIG. 8 and FIG. 9, the convex portions 10 are spherical and arranged in an array on the surface of the glass film 1, the spherical geometric dimensions of the convex portions 10 are that the radius of the bottom surface is 120 μm and the height is 100 μm, the center distance between the bottom surfaces of the convex portions 10 is 160 μm, the thickness of the glass film 1 except the convex portions 10 is 100 μm, the thickness of the plastic film 2 except the concave portions 20 is 200 μm, the spherical geometric dimensions of the concave portions 20 of the plastic film 2 are that the radius of the bottom surface is 100 μm and the height is 100 μm, and the center distance between the bottom surfaces of the convex portions 10 is 160 μm. The thickness of the entire flexible display substrate film was 400 μm, the radius of curvature of the flexible film was determined by the glass film 1, and there was no fixed optimum bending direction, which was substantially the same in each bending direction.
An edge bump 11 is further arranged on the upper surface of the glass film 1, and the edge bump 11 is located within a preset distance range of the edge of the glass film 1; these edge protrusions 11 are effective in reducing the occurrence of various defects. The cross section of the bulge is designed into a triangle, a trapezoid, an arc, a semicircle or a semi-ellipse according to the actual situation. In a particular embodiment the cross-sectional shape is arranged as a half circle with a radius of 100 μm and a height of 100 μm. The edge bead 11 can also be designed with reference to the bead shape, distribution direction and density on the glass film 1, with the disadvantage that it does not necessarily have the best protective effect, but with the advantage that it matches any area of the substrate film, with the bending behavior being identical to the substrate film. When the sum of the height of the glass edge protrusion and the thickness of the glass film 1 is less than 100 μm, the edge protrusion 11 is set to a closed shape to more effectively avoid the occurrence of defects without affecting the bending performance.
In addition, for passive display devices, alkali glass such as sodium glass and neutral borosilicate glass is adopted, so that the cost can be effectively reduced; for active devices, alkali-free glass is adopted, and mainly is alkali-free aluminosilicate glass, and the glass has better chemical stability and electrical insulation property; preferably, the width of the edge portion 22 of the plastic film 2 is chosen to be 500 μm; when the surface of the glass film 1 is taken as a display reference surface, the waviness of the surface of the glass film 1 is made to be 0.3 μm/20mm by grinding.
The following describes an application example of the manufacturing method of the display substrate film according to the present invention with reference to specific steps of the manufacturing method:
melting a glass substrate having a thickness of 0.3mm, and forming a glass film 1 having a plurality of protrusions 10 having a triangular prism shape by a rolling method, wherein the glass film 1 has a thickness of 100 μm except the protrusions 10, the protrusions 10 have a protrusion height of 100 μm, and the protrusions 10 have a maximum width of 100 μm; carrying out laser cutting on the formed glass film 1 to obtain the glass film 1 with the required size, and ensuring that the edge of the glass film 1 is longitudinally in a triangular prism-shaped bulge shape, and the distribution density and the direction of the transverse bulges are consistent with those in the glass film 1; cleaning and drying the glass film 1 and the plastic film 2; covering a plastic film 2 with the thickness of 400 mu m on the glass film 1, ensuring that the outer edge of the plastic film 2 is larger than the glass film by 11mm, and compounding the glass film 1 and the plastic film 2 into a whole by utilizing a laminating method; correcting the width of the edge part 22 of the plastic film 2 to be 500 mu m and the thickness of the edge part 22 of the plastic film 2 to be 350 mu m by using a laser cutting mode; the surface of the glass film 1 is polished so that the waviness of the surface of the glass film 1 is equal to 0.3 μm/20mm, and the thickness of the whole flexible display substrate film is 350 μm.
Forming a plurality of convex parts 10 with a quadrangular prism structure on a glass substrate with the thickness of 100 mu m by using an etching method, wherein the thickness of the part of the glass film 1 except the convex parts 10 is 50 mu m, the convex height of the convex parts 10 is 50 mu m, the maximum width of the convex parts 10 is 50 mu m, the closed convex at the edge of the glass film 1 is in a triangular prism shape, the height is 50 mu m, and the width is 50 mu m; carrying out laser cutting on the formed glass film 1 to obtain the glass film 1 with the required size, and ensuring that the periphery of the glass is surrounded in a triangular prism convex shape; cleaning and drying the glass film 1 and the plastic film 2; covering a plastic film 2 with the thickness of 200 mu m on the glass film 1, ensuring that the outer edge of the plastic film 2 is larger than the glass film by 11mm, and compounding the glass film 1 and the plastic film 2 into a whole by utilizing a laminating method; correcting the width of the edge part 22 of the plastic film 2 to be 500 mu m and the thickness of the edge part 22 of the plastic film 2 to be 200 mu m by using a laser cutting mode; polishing the surface of the glass film 1 to ensure that the waviness of the surface of the glass film 1 is equal to 0.5 mu m/20mm, and the thickness of the whole flexible display substrate film is 200 mu m; the thickness of the plastic film 2 is 100. mu.m.
In the manufacturing method of the display substrate film, the plastic films 2 are made of PEN materials, the laminating temperature of the films is 300 ℃, and the plastic films 2 can be formed to uniformly cover the surfaces of the glass films 1.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (4)

1. A flexible display substrate film, comprising:
a glass film; the upper surface of the glass film is provided with a plurality of convex parts;
a plastic film covering the glass film; the lower surface of the plastic film is provided with a plurality of concave parts for accommodating the convex parts;
the plastic film has: a cover portion disposed opposite to an upper surface of the glass film and an edge portion disposed opposite to a side surface of the glass film;
when the plurality of convex parts are arranged on the upper surface of the glass film in the transverse direction or the longitudinal direction, the convex parts are arranged in a preset distance range from the edge of the glass film; when the plurality of protrusions are arranged on the upper surface of the glass film in an array manner, edge protrusions are arranged within a preset distance range from the edge of the glass film;
the manufacturing method of the display substrate film comprises the following steps:
melting a glass substrate having a thickness of 0.3mm, and forming a glass thin film having a plurality of protrusions having a triangular prism shape by a rolling method, wherein the thickness of the glass thin film excluding the protrusions is 100 μm, the protrusion height of the protrusions is 100 μm, and the maximum width of the protrusions is 100 μm; carrying out laser cutting on the formed glass film to obtain the glass film with required size, and ensuring that the edge of the glass film is in a triangular prism-shaped bulge shape longitudinally and the distribution density and direction of transverse bulges are consistent with those of the inside of the glass film; cleaning and drying the glass film and the plastic film; covering a plastic film with the thickness of 400 mu m on the glass film, ensuring that the outer edge of the plastic film is larger than the glass film by 11mm, and compounding the glass film and the plastic film into a whole by utilizing a laminating method; correcting the width of the edge part of the plastic film to be 500 mu m and the thickness of the edge part (22) of the plastic film to be 350 mu m by using a laser cutting mode; polishing the surface of the glass film to ensure that the waviness of the surface of the glass film is equal to 0.3 mu m/20mm, and the thickness of the whole flexible display substrate film is 350 mu m; the plastic films are all made of PEN materials, and the laminating method has the film superposition temperature of 300 ℃;
or, forming a plurality of convex parts with a quadrangular prism structure on a glass substrate with the thickness of 100 μm by using an etching method, wherein the thickness of the part of the glass film except the convex parts is 50 μm, the convex height of the convex parts is 50 μm, the maximum width of the convex parts is 50 μm, the closed convex at the edge of the glass film is in a triangular prism shape, the height is 50 μm, and the width is 50 micrometers; carrying out laser cutting on the formed glass film to obtain the glass film with the required size, and ensuring that the periphery of the glass is surrounded in a triangular prism convex shape; cleaning and drying the glass film and the plastic film; covering a plastic film with the thickness of 200 mu m on the glass film, ensuring that the outer edge of the plastic film is larger than the glass film by 11mm, and compounding the glass film and the plastic film into a whole by utilizing a laminating method; correcting the width of the edge part of the plastic film to be 500 mu m and the thickness of the edge part of the plastic film to be 200 mu m by using a laser cutting mode; polishing the surface of the glass film to ensure that the waviness of the surface of the glass film is equal to 0.5 mu m/20mm, and the thickness of the whole flexible display substrate film is 200 mu m; the thickness of the plastic film is 100 mu m; the plastic films are all made of PEN materials, and the laminating temperature of the films is 300 ℃.
2. The flexible display substrate film of claim 1, further comprising:
electrodes arranged on the lower surface of the glass film and/or the upper surface of the plastic film;
and the thin film transistor is arranged on the lower surface of the glass film and/or the upper surface of the plastic film.
3. A display device characterized by having the flexible display substrate film of claim 1 or 2.
4. The display device according to claim 3, wherein the display device is a liquid crystal display device, an organic light emitting diode display device, or an electronic paper display device.
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