CN113683807A - Optical flexible cover plate structure - Google Patents

Optical flexible cover plate structure Download PDF

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Publication number
CN113683807A
CN113683807A CN202010425430.3A CN202010425430A CN113683807A CN 113683807 A CN113683807 A CN 113683807A CN 202010425430 A CN202010425430 A CN 202010425430A CN 113683807 A CN113683807 A CN 113683807A
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China
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hard coating
flexible cover
cover plate
layer
transparent plastic
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萧宏谚
林昇勋
张之礼
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Kaixin Optoelectronics Co ltd
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Kaixin Optoelectronics Co ltd
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Priority to CN202010425430.3A priority Critical patent/CN113683807A/en
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    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
    • 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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    • C08J2345/00—Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers
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    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
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    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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    • C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2377/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
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    • C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
    • C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
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    • C08J2445/00—Characterised by the use of homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic ring system; Derivatives of such polymers
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    • C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2477/10—Polyamides derived from aromatically bound amino and carboxyl groups of amino carboxylic acids or of polyamines and polycarboxylic acids
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
    • C08J2479/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08J2479/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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    • C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
    • C08J2483/04—Polysiloxanes
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    • C08J2483/16—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers in which all the silicon atoms are connected by linkages other than oxygen atoms

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Abstract

The invention is an optical flexible cover plate structure, which includes: a transparent plastic substrate layer, the thickness of the transparent plastic substrate layer is 15-100 μm; at least two hard coating layers, wherein the thickness of the first hard coating layer is 3-8 μm, and the first hard coating layer is positioned on one surface of the transparent plastic substrate layer; wherein the thickness of the second hard coating layer is 1.5-3 μm, and the second hard coating layer is positioned on the other surface of the first hard coating layer; the thickness of the first hard coating is larger than that of the second hard coating, the transmittance of each single hard coating is 85-95%, and the difference between the transmittance and the refractive index of the adjacent hard coating is at least more than 0.5%; the refractive index of the hard coating is 1.3-1.6; the optical flexible cover plate structure is characterized in that the transparent plastic substrate layer is combined with at least two hard coating stacks to cause the optical flexible cover plate structure to cause total internal reflection of light, so that the macromolecular optical flexible cover plate structure has appearance performance close to glass and has scratch-resistant and bending-resistant characteristics.

Description

Optical flexible cover plate structure
Technical Field
The invention relates to the technical field of optical film display, in particular to a cover plate of a flexible display screen substrate.
Background
The cover plate material of the flexible display screen substrate is mainly formed by compounding rigid glass or flexible polymers and a functional layer. The cover plate of the glass display substrate can not be bent or bent with large curvature, and does not meet the requirement of folding display devices in the future, and compared with the cover plate made of glass, the polyimide material with high surface hardness and high toughness becomes a preferred high polymer material of the cover plate of the flexible display screen, but needs a surface coating to improve the hardness. In the past research, the polyimide as the cover plate is found to have the defects of insufficient hardness and thicker thickness in the using process. In addition, the cover plate with the polarization function in the display module is formed by laminating the optical adhesive and the upper polarizer, the overall thickness is thicker due to the design, and the hardness of the cover plate is reduced due to the existence of the flexible optical adhesive layer.
The prior art is directed to a polyimide precursor composition for a flexible substrate, such as that disclosed in taiwan patent publication No. I595025, a polyimide precursor composition for a flexible substrate used to produce an optoelectronic device. Polyimide precursor compositions include polyimide precursors derived from structures of diamines or acid dianhydrides. A polyimide film produced from the polyimide precursor composition is also disclosed. The polyimide film is obtained by applying a precursor composition to a substrate and curing the composition. Applications of the composition and the film include use in laminates, optoelectronic components, or flexible displays. The prior art is directed to a silicone resin for window films or a mixture thereof, as disclosed in taiwan patent publication nos. I589645 and I580742, and a composition for window films, comprising: a silicone resin or a mixture thereof, wherein the crosslinkable functional group comprises an epoxy group, an epoxy-containing group, a glycidyl-containing group, a glycidoxy-containing group, an oxetane group or an oxetane group. The prior art is directed to a substrate assembly for coating a simple cleaning coating, such as those disclosed in taiwan patent publication nos. I455899 and I455900, and a substrate assembly for coating a simple cleaning coating, wherein the substrate assembly can improve the hydrophobicity, oleophobicity and durability of the simple cleaning coating. The substrate assembly comprises a carrier material consisting of glass or glass ceramic and an anti-reflection coating consisting of one or at least two layers, wherein the uppermost layer of the one or at least two layers is an adhesion promoter layer which can interact with the easy-to-clean coating, the adhesion promoter layer comprising a mixed oxide, in particular a mixed silicon oxide.
The prior art aims at the research of improving the integral hardness of a flexible display screen cover plate, and for example, a flexible display screen cover plate disclosed in Chinese patent publication No. CN110576664A relates to the technical field of optical films. Its flexible display screen apron includes: a transparent aromatic polyamide substrate; a polysilazane layer provided on one side of the transparent aromatic polyamide substrate; a polarizing layer disposed on the aromatic polyamide substrate on the other side thereof opposite to the polysilazane layer; and a hardened layer disposed on the polarizing layer and on the other side surface opposite to the transparent aromatic polyamide substrate. The polarizing layer is directly prepared on the transparent aromatic polyamide substrate, so that the overall thickness of the flexible display screen cover plate is reduced, and the overall hardness of the flexible display screen cover plate is improved to a great extent.
The prior art is directed at the research of improving the hardness and bending resistance of a flexible display screen cover plate, for example, as disclosed in taiwan patent publication No. TW201940022A, a flexible cover plate, a flexible display and a display panel, wherein the flexible cover plate is applied to the flexible display and comprises an ultrathin glass layer and a substrate, the ultrathin glass layer is used for being attached to the flexible display, and the ultrathin glass layer has bendability; the base material is formed on the ultrathin glass layer and used for improving the hardness of the flexible cover plate. Due to the ultrathin characteristic of the ultrathin glass layer, the flexible cover plate has good bending characteristic, and meanwhile, the base material does not influence the bending characteristic of the flexible cover plate, and the hardness of the flexible cover plate is improved, so that the flexible cover plate formed by the ultrathin glass layer and the base material has good bending characteristic and has the characteristics of hardness, falling resistance and the like. Also disclosed in chinese patent publication No. CN110602274A, is a flexible display cover plate, relating to the technical field of optical films. Its flexible display screen apron includes: a transparent aromatic polyamide substrate; a polysilazane layer provided on one side of the transparent aromatic polyamide substrate; a protective layer disposed on a side of the polysilazane layer opposite to the transparent aromatic polyamide substrate. According to the research, aromatic polyamide is used as a substrate, so that the hardness and the bending resistance of the traditional flexible display screen cover plate are improved.
Disclosure of Invention
Therefore, the cover plate of the flexible display substrate has the defects of hardness, curvature and vitrification appearance similarity, and the invention is used for developing the cover plate of the optical flexible substrate. The invention is an optical flexible cover plate structure, which includes: a transparent plastic substrate layer, which is made of polyethylene terephthalate, polyethylene naphthalate, cyclic olefin polymer, polyamide, polyimide or polyaramide material, and the thickness of the transparent plastic substrate layer is 15-100 μm; at least two hard coating layers, wherein the thickness of the first hard coating layer is 3-8 μm, and the first hard coating layer is positioned on one surface of the transparent plastic substrate layer; wherein the thickness of the second hard coating layer is 1.5-3 μm, and the second hard coating layer is positioned on the other surface of the first hard coating layer; the first hard coating layer has a thickness greater than that of the second hard coating layer, and each single hard coating layer has a transmittance of 85-95% and a refractive index difference of at least 0.5% from that of the adjacent hard coating layer; wherein the hard coating is made of at least one of siloxane resin, polysilazane resin, epoxy resin, acryl resin, polyethylene terephthalate, polyethylene naphthalate, cyclic olefin polymer, polyamide, polyimide or polyaramide material, and at least one oxide of aluminum, tin, magnesium, phosphorus, cerium, zirconium, titanium, cesium, barium, strontium, niobium, zinc and boron and/or silicon oxide mixed with magnesium fluoride, and the refractive index of the hard coating is 1.3-1.6; the optical flexible cover plate structure is characterized in that the transparent plastic substrate layer and at least two hard coating layers are stacked and combined to cause the optical flexible cover plate structure to cause total internal reflection of light, so that the macromolecular optical flexible cover plate structure has appearance performance close to glass and has scratch resistance and bending resistance. Wherein the total light transmittance of the transparent plastic substrate layer is not less than 90% in the wavelength range of 380-780 nm. The haze of the transparent plastic substrate layer was < 1%. The refractive index of the transparent plastic substrate layer is 1.6-1.7. The refractive index of the first hard coating layer in the at least two hard coating layers is 1.3-1.4. The refractive index of the second hard coating layer in the at least two hard coating layers is 1.5-1.6. The at least two hard coating layers are stacked mutually, the total thickness is 4.5-20 mu m, the hard coating layers have progressive refractive index arrangement, and are stacked on one surface of the transparent plastic substrate layer. The bending times of the optical flexible cover plate structure are inwards folded, wherein the bending radius R =1.5mm and reaches 20 ten thousand times, and the bending radius R =3mm and reaches 20 ten thousand times. The bending degree of the optical flexible cover plate structure is less than or equal to 5 mm. The hardness of the optical flexible cover plate structure is larger than or equal to 5H. The invention has better anti-scraping ability of thick coating, and controls the characteristic of total internal reflection of light caused by the structure of the optical flexible cover plate, which is different from the prior art vacuum coating technology, has differentiation, novelty, progress and no error in practical benefit. The technology, means and efficacy of the present invention will be described in detail with reference to the accompanying drawings.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 shows a structure of an optical flexible cover sheet of the present invention.
Fig. 2 shows a structure of another optical flexible cover of the present invention.
Description of the reference numerals
101 transparent plastic substrate layer
201 hard coating
2011 first hard coat layer
2012 second hard coat layer
2013 third hard coat layer
2014 fourth hard coat layer.
Detailed Description
The following embodiments are provided as examples, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and its several details are capable of modification and various changes in detail without departing from the spirit and scope of the present invention.
Fig. 1 is a schematic diagram of an optical flexible cover structure according to an embodiment of the present invention, which shows the optical flexible cover structure, and includes: a transparent plastic substrate layer 101, which is made of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), cyclic olefin polymer (Cyclo-olefin polymer), polyamide, polyimide or Polyaramide (Polyaramide) material, wherein the thickness of the transparent plastic substrate layer 101 is 15-100 μm, and the thickness data of the invention is measured by ASTM D3652 standard; at least two hard coatings 201, wherein the first hard coating 2011 has a thickness of 3-8 μm and is located on one surface of the transparent plastic substrate layer 101; wherein the second hard coating 2012 is 1.5 to 3 μm thick and is disposed on the other surface of the first hard coating 2011; the thickness of the first hard coating 2011 is greater than that of the second hard coating 2012, the thickness of the first hard coating 2011 is greater than that of the second hard coating 2011, so that the first hard coating 2011 can resist scraping and bending external force, and the second hard coating 2012 with the smaller thickness wraps the first hard coating 2011 to enhance external horizontal stress applied to the first hard coating 2011 so as to disperse stress resistance and enhance scraping resistance. In terms of optical characteristics, the transmittance of each single hard coating 201 is 85-95% and the difference of the refractive index of each single hard coating 201 and the refractive index of each adjacent hard coating 201 is at least 0.5%; wherein the hard coating 201 is formed by at least one of siloxane resin, polysilazane resin, epoxy resin, acryl resin, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), cyclic olefin polymer (Cyclo-olefin polymer), polyamide, polyimide or Polyaramide (Polyaramide) material, which is mixed with 1-10 wt% of at least one oxide of aluminum, tin, magnesium, phosphorus, cerium, zirconium, titanium, cesium, barium, strontium, niobium, zinc and boron and/or silicon oxide mixed with magnesium fluoride, and the refractive index of the hard coating 201 is 1.3-1.6; the optical flexible cover plate structure is characterized in that the transparent plastic substrate layer 101 and at least twoThe hard coatings 201 are stacked and combined to cause the optical flexible cover plate structure to cause total internal reflection of light, so that the high-molecular optical flexible cover plate structure has appearance performance close to that of glass and has scratch resistance and bending resistance. Wherein the total light transmittance of the transparent plastic substrate layer 101 is ≧ 90% in the wavelength range of 380-780nm, which is measured according to the test method of JIS K7361. Haze of the transparent Plastic substrate layer 101<1%, the value is measured in accordance with JIS K7136 test standards. The refractive index of the transparent plastic substrate layer 101 is 1.6-1.7. The refractive index of the first hard coating 2011 of the at least two hard coatings 201 is between 1.3 and 1.4. The refractive index of the second hard coating layer 2012 in the at least two hard coating layers 201 is between 1.5 and 1.6. The at least two hard coating layers 201 are stacked with each other, and the total thickness is 4.5-20 μm, wherein the hard coating layers 201 have a progressive refractive index arrangement and are stacked on one surface of the transparent plastic substrate layer 101. The bending times of the optical flexible cover plate structure are inwards bent by the bending radius R =1.5mm and reaches 20 ten thousand times, outwards bent by the bending radius R =3mm and reaches 20 ten thousand times, the test is that the width is 14.2cm, the length is 10.7 cm, the bending times are measured at the speed of 60rpm, and the surface crack condition is observed. The bending of the optically flexible cover plate structure is ≦ 5mm, and the test sample size is 200 x 200 mm. The optical flexible cover plate structure has hardness of 5H or more, and the test is carried out on a pencil hardness meter at 750gf/cm2Under the load of (2), at a speed of 60 mm/min.
The invention overcomes the defect that the traditional coating method cannot be applied to the optical film of the folding cover plate, and the main reason is that the coating thickness of the metal oxide is very thin, and the requirements of surface characteristics such as bending resistance, scraping hardness and the like are not met, so the Anti-Reflection (AR) function of the folding cover plate mainly adjusts the refractive index n values of the first hard coating 2011 and the second hard coating 2012 in the double-layer coating to be 1.3-1.6, and the refractive index difference of the adjacent hard coatings 201 is at least more than 0.5 percent so as to achieve the purpose of reducing the reflectivity, and the Anti-Reflection principle is that the hard coatings 201 are combined and constructed and an interference effect is generated in an optical system to increase the transmission or Reflection characteristics. The performance of the hard coat layer 201 depends on the number of film layers, the thickness of each layer, and the difference in refractive index at the interface of the film layers. The reflectivity of the reflective film is tested by a Hitachi U4100 reflectivity tester, and the reflectivity of the reflective film can reach below 6. The high reflectivity of the flexible cover plate can also be tuned by the reflectivity of the hard coating 201 to maximize its reflectivity over a single or a range of spectral bands, resulting in a glass-like specular reflection. The refractive index n of the hard coating 201 may also be adjusted to have a light splitting or filtering effect, to split incident light into known transmitted and reflected light outputs, or to perform light transmission, light reflection, light absorption or light attenuation at a specific wavelength, etc. When the wavelength of light and the incident angle are standardized, the optical flexible cover plate structure of the invention can achieve the best efficiency by changing the refractive index and the film thickness. Any change of the parameter value will affect the path length of the light inside the optical flexible cover structure, and the phase value changes along with the light transmission. As light passes through the optically flexible cover plate structure, reflections occur in the two index-of-refraction-altered interfaces on either side of the first hard coating 2011 and the second hard coating 2012. To minimize reflection, it is desirable that when the two reflective portions recombine at the first interface, there will be a 180 ° phase shift between them. The refractive index affects not only the optical path length but also the reflectivity characteristics at each hard coat 201 interface. The reflectivity is defined by the fresnel equation, which provides how the amount of reflectivity occurs from the change in refractive index at the interface when a light ray is incident in the forward direction.
To further illustrate the structure and applications covered by the present invention, fig. 2 is a schematic diagram showing another optical flexible cover structure according to the present invention, and another embodiment of the present invention is similar to the optical flexible cover structure shown in fig. 1, which includes: a transparent plastic substrate layer 101 and at least two hard coatings 201, wherein the thickness of the first hard coating 2011 is 3-8 μm, and the first hard coating is located on one surface of the transparent plastic substrate layer 101; wherein the second hard coating 2012 is 1.5 to 3 μm thick and is disposed on the other surface of the first hard coating 2011; the thickness of the first hard coating 2011 is greater than that of the second hard coating 2012, and the transmittance of each single hard coating 201 is between 85 and 95 percent and the difference between the refractive index of each single hard coating 201 and the refractive index of the adjacent hard coating 201 is at least more than 0.5 percent; furthermore, a third hard coating 2013 with a thickness of 1.5-3 μm is added in a coating manner and is positioned on the other surface of the second hard coating 2012; the thickness of the fourth hard coating 2014 is 1.5-3 mu m, and the fourth hard coating 2014 is positioned on the other surface of the third hard coating 2013; it may also increase the number of layers of its hardcoat 201 depending on the optical requirements. The refractive index of the hard coating 201 is 1.3-1.6; the optical flexible cover plate structure is characterized in that the transparent plastic substrate layer 101 and at least two hard coatings 201 are stacked and combined to cause the optical flexible cover plate structure to cause total internal reflection of light, so that the high-molecular optical flexible cover plate structure has the appearance performance close to glass, also has the anti-reflection characteristic, and simultaneously has the anti-scraping and bending characteristics.
The invention relates to an optical flexible cover plate structure, which is a transparent plastic substrate layer 101 and at least two hard coatings 201, wherein the special thickness specification of the hard coatings 201 and the existing coating material are utilized to control the physical refractive index range, so that the characteristics of bending rigidity, bending degree, scratch resistance and manufacturing cost reduction can be achieved. Therefore, the existing defects can be effectively improved, and the practicability is quite high in use.
In view of the foregoing, the specific configurations disclosed in the embodiments of the present invention can provide an optically flexible display application that solves the important scratch resistance problem on the surface of the device, and is not disclosed in the same product in terms of its overall structure, nor before application.
However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all equivalent changes and modifications made according to the content of the present invention should still fall within the scope of the present invention.

Claims (10)

1. An optically flexible cover sheet structure, comprising:
a transparent plastic substrate layer, which is made of polyethylene terephthalate, polyethylene naphthalate, cyclic olefin polymer, polyamide, polyimide or polyaramide material, and the thickness of the transparent plastic substrate layer is 15-100 μm;
at least two hard coating layers, wherein the thickness of the first hard coating layer is 3-8 μm, and the first hard coating layer is positioned on one surface of the transparent plastic substrate layer; wherein the thickness of the second hard coating layer is 1.5-3 μm, and the second hard coating layer is positioned on the other surface of the first hard coating layer; the first hard coating layer has a thickness greater than that of the second hard coating layer, and each single hard coating layer has a transmittance of 85-95% and a refractive index difference of at least 0.5% from that of the adjacent hard coating layer;
wherein the hard coating is composed of at least one of siloxane resin, polysilazane resin, epoxy resin, acryl resin, polyethylene terephthalate, polyethylene naphthalate, cyclic olefin polymer, polyamide, polyimide or polyaramide material, and is formed by adding 1-10 wt% of at least one oxide of aluminum, tin, magnesium, phosphorus, cerium, zirconium, titanium, cesium, barium, strontium, niobium, zinc and boron elements and/or silicon oxide mixed with magnesium fluoride, and the refractive index of the hard coating is 1.3-1.6;
the transparent plastic substrate layer of the optical flexible cover plate structure is combined with at least two hard coating stacks to cause the optical flexible cover plate structure to cause total internal reflection of light, so that the macromolecular optical flexible cover plate structure has appearance performance close to glass and has scratch resistance and bending resistance.
2. The optically flexible cover plate structure of claim 1, wherein the total light transmittance of the transparent plastic substrate layer is ≧ 90% at 780nm wavelength range 380-.
3. The optically flexible cover structure of claim 1, wherein the haze of the transparent plastic substrate layer is < 1%.
4. The optically flexible cover structure of claim 1, wherein the refractive index of the transparent plastic substrate layer is between 1.6 and 1.7.
5. The optically flexible cover structure of claim 1, wherein a first hard coating of the at least two hard coatings has a refractive index of 1.3 to 1.4.
6. The optically flexible cover structure of claim 1, wherein the refractive index of the second hard coating of the at least two hard coatings is between 1.5 and 1.6.
7. The optically flexible cover plate structure of claim 1, wherein the at least two hard coating layers are stacked on each other to have a total thickness of 6.5-12 μm, and the hard coating layers have a progressive refractive index arrangement and are stacked on one surface of the transparent plastic substrate layer.
8. The optically flexible cover structure of claim 1, wherein the bending resistance is R =1.5mm for 20 ten thousand folds and R =3mm for 20 ten thousand folds.
9. The optically flexible cover plate structure according to claim 1, characterized in that its bending is ≦ 5 mm.
10. The optically flexible cover structure according to claim 1, wherein the hardness is ≧ 5H.
CN202010425430.3A 2020-05-19 2020-05-19 Optical flexible cover plate structure Pending CN113683807A (en)

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