WO2018055998A1 - カバーガラス及びそれを用いたディスプレイ - Google Patents
カバーガラス及びそれを用いたディスプレイ Download PDFInfo
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- WO2018055998A1 WO2018055998A1 PCT/JP2017/031021 JP2017031021W WO2018055998A1 WO 2018055998 A1 WO2018055998 A1 WO 2018055998A1 JP 2017031021 W JP2017031021 W JP 2017031021W WO 2018055998 A1 WO2018055998 A1 WO 2018055998A1
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- layer
- acoustic impedance
- glass
- cover glass
- display
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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
- B32B17/08—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 cellulosic plastic substance or gelatin
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
- C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
-
- 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
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
-
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
-
- 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
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- 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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
-
- 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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
- B32B27/365—Layered products comprising a layer of synthetic resin comprising polyesters comprising polycarbonates
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
- C03C17/3405—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of organic materials
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
- G06F1/181—Enclosures
-
- 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
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
-
- 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
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
-
- 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
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
-
- 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
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
Definitions
- the present invention relates to a cover glass used for protecting a display.
- a cover glass (thin glass plate) for protecting a display is often used for a display of a mobile device such as a mobile phone, a personal digital assistant, and a tablet PC.
- a display As the display is becoming lighter and thinner, it is required to make the cover glass thinner.
- the cover glass when the cover glass is thinned, its strength is reduced, and the cover glass is easily broken by dropping the display or colliding metal with the display surface.
- a cover glass that is fragile cannot achieve the purpose of protecting the display.
- Patent Document 1 describes that tempered glass is attached to a display panel with a transparent adhesive.
- Patent Document 2 describes a cover glass in which a glass substrate, an OCA layer (optical clear adhesive layer), and a PET film are laminated in this order.
- JP 2009-122655 A paragraphs 0006 to 0007 JP-T-2016-513612 (FIG. 1)
- an object of the present invention is to provide a technique for increasing the strength of a cover glass against an impact load.
- the present invention A glass layer, A viscoelastic layer, An acoustic impedance adjustment layer disposed between the glass layer and the viscoelastic body layer; With Provided is a cover glass satisfying a relationship of Zg>Zm> Zd when the acoustic impedance of the glass layer is Zg, the acoustic impedance of the acoustic impedance adjustment layer is Zm, and the acoustic impedance of the viscoelastic body layer is Zd.
- the present invention provides: The display body, The above cover glass attached to the display surface of the display body, A display comprising:
- the strength of the cover glass against an impact load can be effectively increased.
- FIG. 1 is a schematic cross-sectional view of a cover glass according to an embodiment of the present invention.
- FIG. 2A is a conceptual diagram showing a distribution of acoustic impedance.
- FIG. 2B is another conceptual diagram showing the distribution of acoustic impedance.
- FIG. 2C is still another conceptual diagram showing the distribution of acoustic impedance.
- FIG. 3 is a graph showing the Weibull distribution of the results of the ballpoint pen drop test of Example 1, Example 2, Example 3, Comparative Example 1 and Comparative Example 2.
- the conventional cover glass has the following problems.
- Hertzian destruction is destruction caused by elastic waves (shock waves) generated at the time of collision.
- shock waves elastic waves generated at the time of collision.
- a cover glass having a laminated structure of glass layer / OCA layer / PET film FIG. 1 of Patent Document 2
- an elastic wave generated at the time of collision is reflected at the interface between the glass layer and the OCA layer, and a standing wave of the elastic wave is generated.
- a strong tensile stress is applied to the latent flaw existing on the surface of the glass layer, and the tensile stress grows a crack, leading to the destruction of the cover glass.
- the cover glass 10 of this embodiment includes a viscoelastic body layer 12, an acoustic impedance adjustment layer 14, and a glass layer 16.
- An acoustic impedance adjustment layer 14 is disposed between the glass layer 16 and the viscoelastic layer 12. That is, the viscoelastic body layer 12, the acoustic impedance adjustment layer 14, and the glass layer 16 are laminated in this order.
- the viscoelastic body layer 12 is in contact with the acoustic impedance adjustment layer 14.
- the acoustic impedance adjustment layer 14 is in contact with the glass layer 16.
- the outermost surface of the cover glass 10 is formed by the glass layer 16.
- the cover glass 10 is attached to the display surface of the display main body so that the viscoelastic body layer 12 is in contact with the display main body directly or through another layer.
- the viscoelastic body layer 12 is a layer formed of a resin that is transparent to visible light (usually a colorless and transparent resin).
- the viscoelastic body layer 12 is formed of a resin material having adhesiveness such as an acrylic adhesive.
- the viscoelastic layer 12 is typically formed of an optical transparent adhesive film (OCA film: optical clear adhesive film) or a UV curable optical transparent resin (OCR: optical clear resin). It is not essential that the viscoelastic layer 12 has adhesiveness. However, when the viscoelastic body layer 12 does not have adhesiveness, an adhesive is separately required when the cover glass 10 is attached to the display body.
- the acoustic impedance adjustment layer 14 is a layer for matching the acoustic impedance between the viscoelastic body layer 12 and the glass layer 16.
- the material of the acoustic impedance adjustment layer 14 is not particularly limited as long as it can exhibit this function and is transparent to visible light (usually colorless and transparent).
- the material composition of the acoustic impedance adjustment layer 14 is different from the material composition of the viscoelastic layer 12.
- the acoustic impedance adjustment layer 14 is formed of, for example, at least one resin selected from the group consisting of polyethylene (PE), polymethyl methacrylate (PMMA), polycarbonate (PC), polypropylene (PP), polyester, polyimide, and polyamide. ing.
- the polyethylene may be high density polyethylene or low density polyethylene.
- polyester include polyethylene terephthalate (PET).
- polyamides include nylon 6 and nylon 6,6.
- the acoustic impedance adjustment layer 14 may be formed of an inorganic material such as SiO 2 or BN.
- the glass layer 16 is formed of, for example, a tempered glass plate.
- An example of the tempered glass plate is a chemically tempered glass plate.
- the chemically strengthened glass plate can be produced by a chemical strengthening method in which a glass plate is treated in a melt of an alkali metal salt and compressive stress is applied to the surface layer portion of the glass plate.
- the glass plate used for the chemically strengthened glass plate is, for example, a glass plate produced by a float process, and has a known glass composition such as soda lime glass or aluminosilicate glass.
- the cover glass 10 of the present embodiment has a relationship of Zg>Zm> Zd. Satisfied.
- the acoustic impedances Zg, Zm and Zd of each layer satisfy such a relationship, the following effects can be obtained. That is, the interfacial reflection of elastic waves generated when an impact is applied to the surface of the cover glass 10 is suppressed, and the generation of standing waves is also suppressed.
- the acoustic impedance adjustment layer 14 may be a layer having a single acoustic impedance.
- the acoustic impedance adjustment layer 14 may be a layer formed by laminating a plurality of layers each having different acoustic impedances. As shown in FIG. 2A, the plurality of layers 14a to 14c constituting the acoustic impedance adjustment layer 14 are laminated so that the acoustic impedance decreases stepwise from the glass layer 16 toward the viscoelastic body layer 12, for example. Yes.
- a layer having an acoustic impedance larger than the acoustic impedance of the glass layer 16 may be disposed between the acoustic impedance adjustment layer 14 and the glass layer 16.
- a layer 14e having an acoustic impedance larger than the acoustic impedance of the glass layer 16 is a plurality of layers 14d to 14f. May be included.
- the acoustic impedance adjustment layer 14 includes at least one layer (layers 14d and 14f) that satisfies the relationship of Zg> Zm> Zd, and a layer (layer 14e) having an acoustic impedance larger than that of the glass layer 16. It may have a laminated structure constituted by. Further, the plurality of layers constituting the acoustic impedance adjustment layer 14 may include a layer having an acoustic impedance smaller than the acoustic impedance Zd of the viscoelastic body layer 12.
- the acoustic impedance may continuously decrease from the glass layer 16 toward the viscoelastic body layer 12.
- the acoustic impedance may be linearly decreased or may be nonlinearly decreased.
- the acoustic impedance Z (kg / m 2 ⁇ sec) is defined by the product of the density ⁇ (kg / m 3 ) of the medium and the speed of sound c (m / sec) in the medium.
- the acoustic impedance Z is defined by the square root of the product of the density ⁇ of the medium and the Young's modulus E of the medium.
- the temperature of the medium is normal temperature (Japanese Industrial Standard: 20 ° C. ⁇ 15 ° C./JIS Z8703).
- the sound speed c in the medium can be measured by a single-around sound speed measuring device.
- the thickness of the cover glass 10 is, for example, in the range of 0.015 to 0.15 mm.
- the thickness td of the viscoelastic layer 12 is, for example, less than 0.1 mm. By making the viscoelastic body layer 12 sufficiently thin, the deformation amount of the glass layer 16 when an impact is applied to the glass layer 16 can be suppressed.
- the lower limit value of the thickness td of the viscoelastic body layer 12 is not particularly limited. The lower limit value of the thickness td is, for example, 10 ⁇ m.
- the thickness tm of the acoustic impedance adjustment layer 14 is, for example, in the range of 0.003 to 20 ⁇ m.
- the thickness tg of the glass layer 16 is in the range of 0.015 to 0.15 mm, for example.
- the bending rigidity of the cover glass 10 also decreases.
- the thickness tg of the glass layer 16, the thickness tm of the acoustic impedance adjustment layer 14, and the thickness td of the viscoelastic body layer 12 satisfy the relationship of (tm + td) ⁇ 0.0002tg. .
- the thickness tg, the thickness tm, and the thickness td desirably satisfy the relationship of (tm + td) ⁇ 0.2 tg.
- the upper limit value of the sum of the thickness tm and the thickness td is not particularly limited.
- the thickness tg, the thickness tm, and the thickness td satisfy, for example, a relationship of 2 ⁇ tg ⁇ (tm + td).
- the viscosity of the viscoelastic body layer 12 is in the range of 0.0001 to 20000 Pa ⁇ sec at room temperature.
- the elastic modulus (tensile modulus (Young's modulus)) of the viscoelastic layer 12 is, for example, in the range of 30E + 3 to 5E + 9 (Pa).
- the viscosity and elastic modulus of the viscoelastic layer 12 mean the viscosity and elastic modulus of the material forming the viscoelastic layer 12, respectively.
- the viscosity can be measured by, for example, an ultrasonic viscometer.
- the measurement principle of the ultrasonic viscometer is as follows. When a vibrator is placed in a sample and vibrated, the amplitude changes due to friction between the sample and the vibrator. The vibrator is vibrated by applying an electric current from the outside so as to make this amplitude constant. The viscosity can be determined from the current value at this time.
- the elastic modulus can be measured by, for example, a dynamic viscoelasticity measuring device (rheometer).
- the measurement principle of the dynamic viscoelasticity measuring apparatus is generally as follows.
- Periodic stress is applied to the sample, and each viscoelastic modulus can be measured from the waveform of shear stress and the phase difference between them.
- a test piece having the same material composition as the material composition of the viscoelastic body layer 12 is produced, and this test piece can be used for measurement of viscosity and measurement of elastic modulus.
- Example 1 A PMMA solution is applied to the back surface of a 48 ⁇ m thick chemically strengthened glass plate (glanova (registered trademark) manufactured by Nippon Sheet Glass Co., Ltd.) by a slit spin method to form a coating film, and the coating film is dried to obtain a thickness of 1. A 3 ⁇ m acoustic impedance adjustment layer was formed. Next, a 20 ⁇ m-thick OCA film (manufactured by 3M) was bonded to the acoustic impedance adjustment layer. Thereby, the cover glass of Example 1 was obtained.
- glanova registered trademark
- 3M 20 ⁇ m-thick OCA film
- Example 2 A PET film having a thickness of 1.3 ⁇ m was bonded as an acoustic impedance adjustment layer to the back surface of a chemically strengthened glass plate having a thickness of 48 ⁇ m (glanova (registered trademark) manufactured by Nippon Sheet Glass Co., Ltd.). An acrylic transparent adhesive was used for bonding the PET film and the glass plate. Next, a 20 ⁇ m-thick OCA film (manufactured by 3M) was bonded to the acoustic impedance adjustment layer. Thereby, the cover glass of Example 2 was obtained.
- Example 3 A PET film having a thickness of 2.2 ⁇ m was bonded as an acoustic impedance adjustment layer to the back surface of a chemically strengthened glass plate having a thickness of 48 ⁇ m (Glanova (registered trademark) manufactured by Nippon Sheet Glass Co., Ltd.). An acrylic transparent adhesive was used for bonding the PET film and the glass plate. Next, a 20 ⁇ m-thick OCA film (manufactured by 3M) was bonded to the acoustic impedance adjustment layer. Thereby, the cover glass of Example 3 was obtained.
- Comparative Example 1 A 20 ⁇ m thick OCA film (manufactured by 3M) made of acrylic adhesive was bonded to the back of a 48 ⁇ m thick chemically strengthened glass plate (glanova (registered trademark) manufactured by Nippon Sheet Glass Co., Ltd.). This obtained the cover glass of the comparative example 1.
- Comparative Example 2 A Si 3 N 4 film having a thickness of 25 nm was formed on the back surface of a chemically tempered glass plate having a thickness of 48 ⁇ m (glanova (registered trademark) manufactured by Nippon Sheet Glass Co., Ltd.) by sputtering. Next, a 20 ⁇ m thick OCA film (manufactured by 3M) was bonded onto the Si 3 N 4 film. Thereby, the cover glass of Comparative Example 2 was obtained.
- the drop started from a height of 1 cm, and the drop height of the ballpoint pen was increased in 1 cm increments. Twenty-two samples were prepared from the cover glasses of Examples 1 and 2 and Comparative Examples 1 and 2, and a ballpoint pen drop test was performed on these 22 samples. Eleven samples were produced from the cover glass of Example 3, and a ballpoint pen drop test was performed on these eleven samples. The test results are shown in Table 1 and FIG. FIG. 3 shows the Weibull distribution of the test results. In Table 1, the item “B10 (/ cm)” indicates the height when 10% of the samples were broken.
- Example 1 The average breaking heights of Examples 1 to 3 were much higher than the average breaking heights of Comparative Examples 1 and 2.
- the average breaking height of Example 3 was the largest. It is considered that the impedance matching between the glass layer and the viscoelastic layer suppressed the reflection of elastic waves at the interface, reducing the stress applied to the cracks on the surface of the glass layer, resulting in an increase in average fracture height.
- the acoustic impedance Zg of the glass layer (glanova (registered trademark)) is 1.4E + 07 (kg / m 2 ⁇ s)
- the acoustic impedance Zm of the acoustic impedance adjustment layer PMMA is 1.7E + 06 (kg).
- the acoustic impedance Zd of the viscoelastic layer (OCA) was 1.8E + 05 (kg / m 2 ⁇ s), which satisfied the relationship of Zg>Zm> Zd.
- the acoustic impedance Zm of the acoustic impedance adjustment layer (PET) was 3.0E + 06 (kg / m 2 ⁇ s), and the relationship of Zg>Zm> Zd was satisfied.
- Comparative Example 2 was inferior to Comparative Example 1.
- Comparative Example 2 the maximum stress is doubled by the large reflection of elastic waves at the glass layer / Si 3 N 4 film interface and the fact that the position of the antinode of the standing wave substantially coincides with the position of the interface. This is probably because even a slight impact led to the destruction.
- the cover glass was excellent in impact resistance.
- the upper limit value of the intensity transmittance is, for example, 12%, and desirably 13%. However, if the strength transmittance is equal to or greater than a certain value, the viscoelastic layer easily exhibits the performance of absorbing shock waves, and therefore the upper limit value of the strength transmittance is not particularly limited.
- the technology disclosed in this specification is useful for a cover glass used for protecting a display.
- the type of display is not particularly limited, and examples thereof include displays for mobile devices, television receivers, navigation devices, and the like.
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Abstract
Description
ガラス層と、
粘弾性体層と、
前記ガラス層と前記粘弾性体層との間に配置された音響インピーダンス調整層と、
を備え、
前記ガラス層の音響インピーダンスがZg、前記音響インピーダンス調整層の音響インピーダンスがZm、前記粘弾性体層の音響インピーダンスがZdであるとき、Zg>Zm>Zdの関係を満足する、カバーガラスを提供する。
ディスプレイ本体と、
前記ディスプレイ本体の表示面に取り付けられた上記のカバーガラスと、
を備えた、ディスプレイを提供する。
Z=ρc
c=(E/ρ)1/2
厚さ48μmの化学強化ガラス板(日本板硝子社製 glanova(登録商標))の裏面にスリットスピン法によってPMMAの溶液を塗布して塗膜を形成し、塗膜を乾燥させることによって厚さ1.3μmの音響インピーダンス調整層を形成した。次に、音響インピーダンス調整層の上にアクリル粘着剤でできた厚さ20μmのOCAフィルム(3M社製)を貼り合わせた。これにより、実施例1のカバーガラスを得た。
厚さ48μmの化学強化ガラス板(日本板硝子社製 glanova(登録商標))の裏面に音響インピーダンス調整層として厚さ1.3μmのPETフィルムを貼り合わせた。PETフィルムとガラス板との貼り合わせにはアクリル系の透明な粘着剤を使用した。次に、音響インピーダンス調整層の上にアクリル粘着剤でできた厚さ20μmのOCAフィルム(3M社製)を貼り合わせた。これにより、実施例2のカバーガラスを得た。
厚さ48μmの化学強化ガラス板(日本板硝子社製 glanova(登録商標))の裏面に音響インピーダンス調整層として厚さ2.2μmのPETフィルムを貼り合わせた。PETフィルムとガラス板との貼り合わせにはアクリル系の透明な粘着剤を使用した。次に、音響インピーダンス調整層の上にアクリル粘着剤でできた厚さ20μmのOCAフィルム(3M社製)を貼り合わせた。これにより、実施例3のカバーガラスを得た。
厚さ48μmの化学強化ガラス板(日本板硝子社製 glanova(登録商標))の裏面にアクリル粘着剤でできた厚さ20μmのOCAフィルム(3M社製)を貼り合わせた。これにより、比較例1のカバーガラスを得た。
厚さ48μmの化学強化ガラス板(日本板硝子社製 glanova(登録商標))の裏面にスパッタリング法によって厚さ25nmのSi3N4膜を形成した。次に、Si3N4膜の上にアクリル粘着剤でできた厚さ20μmのOCAフィルム(3M社製)を貼り合わせた。これにより、比較例2のカバーガラスを得た。
まず、実施例及び比較例のカバーガラスをフレキシブルディスプレイに見立てたPETフィルム(厚さ30μm)に貼り付けた。これにより、カバーガラスとPETフィルムとの積層体を得た。次に、カバーガラスが上になるように厚さ5mmのガラス板の上に積層体を配置した。このようにして、ボールペン落下試験用の試料を得た。カバーガラスの表面に高硬度鋼ペン先(直径0.7mm)を有する5gのボールペンを落下させ、カバーガラスが破壊される高さを調べた。具体的には、カバーガラスの特定の位置に向けてボールペンを落下させ、カバーガラスが破壊された高さを記録した。1cmの高さから落下を開始し、1cm刻みでボールペンの落下高さを増加させた。実施例1,2及び比較例1,2のカバーガラスから22個の試料を作製し、それら22個の試料のボールペン落下試験を実施した。実施例3のカバーガラスから11個の試料を作製し、それら11個の試料のボールペン落下試験を実施した。試験結果を表1及び図3に示す。図3は、試験結果のワイブル分布を示している。表1において、「B10(/cm)」の項目は、10%の試料が破壊されたときの高さを示している。
各層の音響インピーダンスを使用し、実施例及び比較例のカバーガラスにおいてガラス層からOCA層に伝搬する衝撃波の強度透過率を理論計算によって算出した。結果を表1に示す。
Claims (6)
- ガラス層と、
粘弾性体層と、
前記ガラス層と前記粘弾性体層との間に配置された音響インピーダンス調整層と、
を備え、
前記ガラス層の音響インピーダンスがZg、前記音響インピーダンス調整層の音響インピーダンスがZm、前記粘弾性体層の音響インピーダンスがZdであるとき、Zg>Zm>Zdの関係を満足する、カバーガラス。 - 前記粘弾性体層及び前記音響インピーダンス調整層は、可視光に対して透明な材料でできている、請求項1に記載のカバーガラス。
- 前記粘弾性体層は、光学用透明粘着フィルムで構成されている、請求項1又は2に記載のカバーガラス。
- 前記インピーダンス調整層は、ポリエチレン、ポリメタクリル酸メチル、ポリカーボネート、ポリプロピレン、ポリエステル、ポリイミド及びポリアミドからなる群より選ばれる少なくとも1つの樹脂でできている、請求項1~3のいずれか1項に記載のカバーガラス。
- 前記ガラス層から前記粘弾性体層に伝達する衝撃波の強度透過率が10%以上である、請求項1~4のいずれか1項に記載のカバーガラス。
- ディスプレイ本体と、
前記ディスプレイ本体の表示面に取り付けられた請求項1~5のいずれか1項に記載のカバーガラスと、
を備えた、ディスプレイ。
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US11155492B2 (en) | 2021-10-26 |
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