WO2024111546A1 - ディスプレイカバー材、車載用表示装置、ディスプレイカバー材の製造方法及び車載用表示装置の製造方法 - Google Patents

ディスプレイカバー材、車載用表示装置、ディスプレイカバー材の製造方法及び車載用表示装置の製造方法 Download PDF

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Publication number
WO2024111546A1
WO2024111546A1 PCT/JP2023/041616 JP2023041616W WO2024111546A1 WO 2024111546 A1 WO2024111546 A1 WO 2024111546A1 JP 2023041616 W JP2023041616 W JP 2023041616W WO 2024111546 A1 WO2024111546 A1 WO 2024111546A1
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WIPO (PCT)
Prior art keywords
printed layer
cover material
display cover
opening
layer
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Ceased
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PCT/JP2023/041616
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English (en)
French (fr)
Japanese (ja)
Inventor
啓一郎 裏地
遼太 松元
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AGC Inc
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Asahi Glass Co Ltd
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Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Priority to CN202380080044.7A priority Critical patent/CN120226064A/zh
Priority to JP2024560139A priority patent/JPWO2024111546A1/ja
Publication of WO2024111546A1 publication Critical patent/WO2024111546A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present invention relates to a display cover material with a printed layer, an in-vehicle display device, a manufacturing method for a display cover material with a printed layer, and a manufacturing method for an in-vehicle display device.
  • cover materials are used on the front of touch panels and display panels.
  • a known configuration of this type of cover material is one in which a printed layer with light-blocking properties is provided on the periphery of a transparent substrate such as glass. It is also known to provide alignment marks on the printed layer for alignment when the cover material and liquid crystal panel are bonded together (for example, Patent Document 1).
  • Patent Document 1 had the problem that the positional accuracy of the alignment marks was insufficient, resulting in misalignment when bonding with the liquid crystal panel. Furthermore, with a three-dimensional cover material such as that of Patent Document 2, it was particularly difficult to improve the positional accuracy of the alignment marks.
  • the display cover material according to the present invention is a display cover material comprising a transparent substrate having a first main surface and a second main surface, and a first printed layer laminated on the second main surface and having a first opening, wherein a second printed layer is laminated on a portion of the surface of the first printed layer, the second printed layer has a different color from the first printed layer, the second printed layer has a second opening, the first printed layer is exposed at the second opening, and a plurality of irradiation marks are formed on the surface of the first printed layer at the second opening.
  • the in-vehicle display device comprises the above-mentioned display cover material and a display.
  • the manufacturing method of the display cover material according to the present invention includes laminating a first printed layer having a first opening on a second main surface of a transparent substrate having a first main surface and a second main surface, laminating a second printed layer having a color different from that of the first printed layer on a portion of the surface of the first printed layer, and irradiating the surface of the second printed layer with laser light to remove the second printed layer to form a second opening and expose the first printed layer through the second opening.
  • a method for forming an in-vehicle display device includes bonding the above-mentioned display cover material to a display, The display is attached by aligning the display and the display cover material using the pattern formed by the second opening as an alignment mark.
  • the present invention provides a display cover material on which marks are formed with high positional accuracy, and a method for manufacturing a display cover material on which marks are formed with high positional accuracy.
  • FIG. 1 is a schematic diagram showing an in-vehicle display device equipped with a display cover material according to this embodiment.
  • FIG. 2 is a cross-sectional view of a display cover material with a printed layer according to this embodiment.
  • FIG. 3 is a plan view of the display cover material with a printed layer according to this embodiment.
  • FIG. 4 is a graph showing the film thickness distribution of the first printed layer.
  • FIG. 5A is a plan view showing an alignment mark formed in the second opening.
  • FIG. 5B is a plan view showing an alignment mark formed in the second opening.
  • FIG. 6A is a plan view showing irradiation marks on the surface of the first printed layer exposed at the second opening.
  • FIG. 6B is a plan view showing irradiation marks on the surface of the first printed layer exposed at the second opening.
  • FIG. 7 is a schematic diagram showing an example of the configuration of a laser irradiation device that irradiates a part of the first printed layer with laser light.
  • FIG. 8 is a schematic diagram showing an example of a laser irradiation device.
  • FIG. 9A is an image taken of the surface of the second opening in Test Example 2.
  • FIG. 9B is an image taken of the surface of the second opening in Test Example 3.
  • FIG. 9C is an image of the surface of the second opening in Test Example 4.
  • FIG. 1 is a schematic diagram showing an in-vehicle display device equipped with a display cover material according to the present embodiment.
  • the in-vehicle display device 2 is a display device provided in a vehicle, and is provided, for example, in front of a steering shaft 1 in a vehicle.
  • the in-vehicle display device 2 includes a display panel 3 and a display cover material 100.
  • the display panel 3 displays, for example, images of a car navigation screen, various meters such as a speedometer, and a start button.
  • the display cover material 100 is used as a cover material for the front surface of the display panel 3.
  • FIG. 1 is a schematic diagram showing an in-vehicle display device equipped with a display cover material according to the present embodiment.
  • the in-vehicle display device 2 is a display device provided in a vehicle, and is provided, for example, in front of a steering shaft 1 in a vehicle.
  • the in-vehicle display device 2 includes a display panel 3 and a
  • the in-vehicle display device to which the display cover material 100 is applied may have any configuration.
  • the display cover material 100 is not limited to being used as a cover material for the surface of an in-vehicle display device, and may be used for any purpose, including a cover material for a display device such as a smartphone.
  • the display cover material 100 with a printed layer in this embodiment comprises a transparent substrate 10 having a first main surface 10A and a second main surface 10B, a first printed layer 11 laminated on the second main surface 10B and having a first opening 12, and a second printed layer 13 laminated on a portion of the surface of the first printed layer 11.
  • the first printed layer 11 and the second printed layer 13 have different colors, and multiple irradiation marks 20 (see Figures 6A and 6B) are formed on the surface of the first printed layer 11 exposed at the second opening 14.
  • the second main surface 10B is attached to the display panel 3, and the first opening 12 is used as a display section of the display.
  • the pattern formed by the second opening 14 and the first printed layer 11 exposed from the second opening 14 is used, for example, as an alignment mark for aligning the display cover material 100 and the display panel 3 when they are attached to each other.
  • the structure of each layer will be described below.
  • the transparent substrate 10 is not particularly limited in material as long as it has a high visible light transmittance and can protect the display panel 3, and may be made of resin or glass, with glass being preferred from the standpoints of strength, safety, heat resistance, and weather resistance.
  • resins examples include polyethylene terephthalate, polycarbonate, and polymethyl methacrylate.
  • alkali-free glass soda lime glass, soda lime silicate glass, aluminosilicate glass, borosilicate glass, lithium aluminosilicate glass, borosilicate glass, etc.
  • aluminosilicate glass and lithium aluminosilicate glass are preferred because they can easily receive large stress through tempering treatment even when they are thin, resulting in high-strength glass.
  • the glass is preferably, for example, chemically strengthened glass strengthened by a chemical strengthening treatment.
  • a typical method for obtaining chemically strengthened glass by subjecting glass to chemical strengthening treatment is to immerse the glass in a KNO3 molten salt, perform an ion exchange treatment, and then cool it to about room temperature.
  • the treatment conditions such as the temperature of the KNO3 molten salt and the immersion time may be set so that the surface compressive stress and the thickness of the compressive stress layer have the desired values.
  • the surface compressive stress (CS) of the compressive stress layer is preferably 500 MPa or more, more preferably 600 MPa or more, and even more preferably 700 MPa or more. On the other hand, CS is preferably 1300 MPa or less.
  • the thickness (DOL) of the compressive stress layer is preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, further preferably 20 ⁇ m or more, particularly preferably 25 ⁇ m or more. The DOL is preferably 50 ⁇ m or less, more preferably 40 ⁇ m or less.
  • examples of the glass type include soda lime glass, aluminosilicate glass (SiO 2 —Al 2 O 3 —Na 2 O-based glass), etc.
  • aluminosilicate glass is preferable from the viewpoint of strength.
  • the glass material include glass materials containing, in mole percent based on oxides, 50% or more and 80% or less of SiO2 , 1% or more and 20% or less of Al2O3 , 6% or more and 20% or less of Na2O , 0% or more and 11% or less of K2O , 0% or more and 15% or less of MgO, 0% or more and 6% or less of CaO, and 0% or more and 5% or less of ZrO2 .
  • Chemically strengthened glass based on aluminosilicate glass is also suitably used, for example, "Dragontrail (registered trademark)" manufactured by AGC.
  • the following glass compositions are preferred for the transparent substrate 10.
  • "containing 0 to 25% MgO” means that MgO is not essential but may be contained up to 25%.
  • the following glass (i) is included in soda lime silicate glass, the following glasses (ii) and (iii) are included in aluminosilicate glass, and the following glasses (iv) to (vi) are included in lithium aluminosilicate glass.
  • the thickness of the glass is not particularly limited, but in order to effectively perform the chemical strengthening process, it is usually preferable that the thickness is 5 mm or less, and more preferably 3 mm or less. Furthermore, when used as a cover glass for an in-vehicle display device such as a car navigation system, from the viewpoint of strength, the thickness of the glass is preferably 0.2 mm or more, more preferably 0.8 mm or more, and even more preferably 1 mm or more.
  • the thickness of the glass refers to the distance in the normal direction between the first main surface 10A and the second main surface 10B of the transparent substrate 10. Furthermore, even if the transparent substrate 10 is made of a material other than glass, it may have a thickness similar to the above-mentioned glass thickness.
  • the dimensions of the transparent substrate 10 can be appropriately selected depending on the application.
  • the length of the short side is, for example, 50 mm or more and 500 mm or less, and preferably 100 mm or more and 300 mm or less
  • the length of the long side is, for example, 50 mm or more and 1500 mm or less, and preferably 100 mm or more and 1200 mm or less.
  • the shape of the transparent substrate 10 may be a flat shape as shown in FIG. 2, but may also be a shape including a three-dimensional curved surface having one or more curved or bent portions.
  • a curved surface refers to a surface having a radius of curvature of 10,000 mm or less
  • a flat surface refers to a surface having a radius of curvature of more than 10,000 mm.
  • the radius of curvature of the curved surface is preferably 50 mm or more, more preferably 100 mm or more, and even more preferably 200 mm or more.
  • the radius of curvature is, for example, 10,000 mm or less, preferably 5,000 mm or less, and more preferably 3,000 mm or less.
  • the display cover material 100 When the display cover material 100 is used for an in-vehicle display device, a shape with a curved surface is preferred to improve visibility and design, but with a curved surface, it is difficult to align the display cover material 100 and the display panel 3 when bonding them together, and it has been difficult to form marks with good positional accuracy using existing methods.
  • the minimum radius of curvature of the curved surface is 800 mm or less, it is even more difficult to improve the positional accuracy of the marks using existing printing methods, and the display cover material 100 of this embodiment is preferably used.
  • the planar shape of the transparent substrate 10 may be a rectangle as shown in FIG. 3, but is not limited thereto, and may be a substantially rectangular shape with curved sides or a shape with recesses or protrusions on each side.
  • the planar shape of the transparent substrate 10 may be a rectangle as shown in FIG. 3, but is not limited thereto, and may be a substantially rectangular shape with curved sides or a shape with recesses or protrusions on each side.
  • complex shapes from the viewpoint of improving design and visibility. With such complex shapes, it is difficult to align the display cover material 100 and the display panel 3 when they are bonded together, and there is a particular demand for improved positional accuracy of the alignment marks.
  • the transparent substrate 10 has a curved surface, the first printed layer 11, the second printed layer 13, and other decorative layers described below will deform to follow the shape of the transparent substrate 10.
  • a first printed layer 11 having a first opening 12 is formed on the second main surface 10B of the transparent substrate 10.
  • the second main surface 10B of the transparent substrate 10 is exposed in the first opening 12, but is omitted in Fig. 3.
  • the first printed layer 11 is provided on the outer periphery of the transparent substrate 10 and has one first opening 12, but is not limited thereto.
  • the first printed layer 11 may have two independent first openings 12.
  • the first printed layer 11 plays a role of hiding wiring members and the like arranged on the periphery of the display panel 3 so that areas other than the display area cannot be viewed from the observer side.
  • the first printed layer 11 is formed, for example, by a method of printing ink, and is preferably formed by hardening a thermosetting or photosetting ink from the viewpoint of enhancing durability.
  • the color of the first printed layer 11 is not particularly limited, but from the viewpoint of high light blocking properties, a color with low brightness is preferably used.
  • the color of the first printed layer 11 may be black, brown, navy blue, etc., and may be a pattern print such as a wood grain pattern.
  • the first printed layer 11 may be a single layer, or may be composed of multiple layers. When composed of multiple layers, the same ink may be applied multiple times, or different inks may be applied multiple times. For example, the light-blocking properties can be improved by applying multiple layers of the same ink. For example, after a first layer that imparts design is formed on glass, a second layer may be applied with a different ink that has high light-blocking properties.
  • the first printed layer 11 may also have a different number of layers in some parts.
  • the infrared-transmitting region in part of the printed layer, it is possible to form a first layer on the glass that blocks visible light and transmits infrared light, and then form a second layer with even higher light-blocking properties in the region other than the infrared-transmitting region.
  • the first printed layer 11 is preferably formed to a thickness of 2.0 ⁇ m to 20.0 ⁇ m, and more preferably 5.0 ⁇ m to 15.0 ⁇ m. If the thickness is thicker than 20 ⁇ m, air bubbles are likely to remain at the printing step when the transparent substrate 10 and the display panel 3 (FIG. 1) are bonded together using an optical adhesive. By making the thickness 2.0 ⁇ m or more, the light-shielding properties of the first printed layer 11 are sufficiently ensured, and it is easy to prevent the pattern formed by the wiring and the second opening 14 from being seen through from the first main surface 10A side.
  • the thickness of the first printed layer 11 is preferably determined by averaging thicknesses measured at multiple points in an area excluding a 4 mm periphery of the first opening 12 and the first printed layer 11 exposed at the second opening 14.
  • the number of measurement points is preferably, for example, three or more, and is preferably selected without bias on the main surface.
  • the shape of the end of the first printed layer 11 at the boundary between the first printed layer 11 and the first opening 12 is not particularly limited, but it is preferable that it has a steep slope in cross-sectional view.
  • the slope of the end is preferably 0.1 or more, more preferably 0.5 or more, and even more preferably 1.0 or more. When the slope of the end is within the above range, the area in the first printed layer 11 that is thin and has low light blocking properties becomes narrower, light leakage at the end is further suppressed, and the boundary becomes clearer, resulting in better design when the display cover material 100 is used in a display device.
  • the slope of the end of the first printed layer 11 is found by setting two points P1 and P2 of different thicknesses on the surface of the end 11A, and calculating the ratio (Lt/Lh) of the distance Lt in the thickness direction to the distance Lh in the in-plane direction between these two points P1 and P2.
  • point P1 is the point where the thickness of the first printed layer 11 reaches 10% of the average thickness t of the first printed layer 11
  • point P2 is the point where the thickness of the first printed layer 11 reaches 50% of the average thickness t of the first printed layer 11.
  • a first printed layer 11 with an end slope within the above range can be formed, for example, by performing laser trimming, which will be described later, and adjusting the laser trimming conditions.
  • the second printed layer 13 is formed on a portion of the first printed layer 11 and has a second opening.
  • the second printed layer 13 has a different color from the first printed layer 11, and thus can form a pattern detectable by a camera or the like in the second opening 14.
  • the color of the second printed layer 13 preferably differs from that of the first printed layer 11 by a color difference ⁇ E value of 2.0 or more, and more preferably by 3.0 or more.
  • the color tone of the first printed layer 11 and the second printed layer 13 can be measured on each surface by, for example, an SCI colorimeter (e.g., CM-5 manufactured by Konica Minolta, Inc.) The measurement is preferably performed at three points selected without bias in the target area, and the average value is used. As described above, since a low brightness color is preferably used for the first printed layer 11, it is preferable to use a relatively bright color for the second printed layer 13, and it is more preferable for the color to be white or close to white.
  • SCI colorimeter e.g., CM-5 manufactured by Konica Minolta, Inc.
  • the second printed layer 13 is formed, for example, by a method of printing ink. In order to make the color of the second printed layer 13 relatively brighter than that of the first printed layer 11, it is preferable that the second printed layer 13 does not contain carbon black or that the carbon black content is less than that of the first printed layer 11. In addition, it is preferable that the second printed layer 13 contains a white material, for example, titanium oxide. As described below, the second printed layer 13 is preferably formed by a printing method that does not include a step of curing by heating or light irradiation. From this viewpoint, the second printed layer 13 is preferably formed by curing an ink that is neither thermosetting nor light curing, and as a material having such properties, the main component of the second printed layer 13 is preferably a non-crosslinking resin.
  • the position where the second printed layer 13 is formed is not particularly limited as long as it is on the first printed layer 11, and if the transparent substrate 10 is rectangular, it may be provided on a side or a corner. There may be one second printed layer 13, or multiple second printed layers 13 may be formed. If the pattern formed by the second openings 14 is used as an alignment mark, from the viewpoint of improving the accuracy of alignment, the second printed layer 13 is preferably formed in two or more places, and more preferably in three or more places.
  • the shape of the second printed layer 13 is not particularly limited, and may be rectangular or circular.
  • the size of the second printed layer 13 is not particularly limited, and may be large enough for the desired size of the second opening 14.
  • the pattern formed in the second opening 14 is used, for example, as an alignment mark for alignment when bonding with the display panel 3.
  • the shape of the second opening is not particularly limited, and may be, for example, a cross as shown in FIG. 5A, or a square, circle, or any other shape.
  • a plurality of second openings 14 may be provided in one second printed layer 13, and may form a pattern showing information such as a QR code (registered trademark), a barcode, or other character strings, as shown in FIG. 5B.
  • the size of the second opening 14 is not particularly limited, but when used as an alignment mark, it is preferable that the diameter of the circumscribing circle of the pattern to be formed is 1 mm or more and 20 mm or less. In particular, when the alignment mark is rectangular, it is preferable that the diagonal length is 1 mm or more and 20 mm or less.
  • the second opening 14 is formed by removing the second printed layer 13 by irradiation with laser light as described below, and therefore an irradiation mark 20 as shown in Figures 6A and 6B and in the examples described below is formed on the surface of the first printed layer 11 exposed at the second opening 14.
  • the irradiation mark 20 is a part where the surface of the first printed layer 11 is altered by the irradiation with laser light and appears to have a different color, and has a substantially circular shape.
  • the irradiation mark 20 occurs in a part of the area irradiated with the laser light.
  • the cross-sectional intensity distribution of the laser light is usually based on a Gaussian distribution, with the intensity being higher in the center near the optical axis. Therefore, the irradiation mark 20 occurs near the center of the optical axis, particularly in the part where the surface of the first printing layer 11 is damaged.
  • the arrangement of the irradiation marks 20 is not particularly limited, but from the viewpoint of simultaneously suppressing damage to the first printed layer 11 and removing the second printed layer 13, it is preferable that they are arranged in a regular pattern.
  • they may be in a checkerboard pattern as shown in FIG. 6A, or a staggered pattern as shown in FIG. 6B.
  • the diameter d of the irradiation mark 20 is preferably 10 ⁇ m or more, and more preferably 30 ⁇ m or more, from the viewpoint of productivity, for example.
  • the diameter d of the irradiation mark 20 is preferably 200 ⁇ m or less, and more preferably 100 ⁇ m or less, from the viewpoint of clarifying the contour of the shape of the alignment mark.
  • the spacing p of the irradiation marks 20 is preferably greater than 1.0 times the diameter d of the irradiation marks 20.
  • the irradiation marks 20 are areas where the first printed layer 11 is particularly damaged, and by irradiating the laser light so that these areas do not overlap, damage to the first printed layer can be suppressed, and a reduction in the film thickness, which would reduce the light-blocking properties of the printed layer, and the occurrence of light leakage can be suppressed. It is more preferable that the spacing p of the irradiation marks 20 is 1.1 times or more the diameter d of the irradiation marks 20.
  • the spacing p of the irradiation marks 20 is, for example, 2.6 times or less than the diameter d of the irradiation marks 20, the area where the second printed layer 13 remains unremoved can be reduced to less than 30%.
  • the spacing p of the irradiation marks 20 is preferably 2.0 times or less than the diameter d of the irradiation marks 20, and if the spacing p of the irradiation marks 20 is within the above range, the area where the second printed layer 13 remains unremoved can be almost eliminated, improving the distinguishability of the pattern. It is more preferable that the spacing p of the irradiation marks 20 is 1.8 times or less than the diameter d of the irradiation marks 20, and even more preferable that it is 1.5 times or less.
  • the positional accuracy of the second opening 14 can be increased. Furthermore, by having the spacing p of the irradiation marks 20 within the above range, damage to the first printed layer 11 can be suppressed and the distinguishability of the pattern can be increased.
  • positional accuracy in this embodiment means the deviation between the planned position of the second opening 14 and the position where it is actually formed.
  • the planned position and the actual position of formation may be evaluated by, for example, taking a part of the boundary line between the first opening 12 and the first printed layer 11 as a reference point and evaluating the position by the distance from there.
  • positional accuracy can be achieved to within ⁇ 50 ⁇ m.
  • light leakage means a decrease in the light blocking properties of the printed layer or the occurrence of pinholes.
  • the decrease in light blocking properties can be evaluated, for example, by the OD value (Optical Density) of the printed layer, and it is generally known that there is a correlation between a decrease in film thickness and the OD value.
  • the variation in the irradiation marks 20 is preferably 0.4 times or less the diameter d of the irradiation marks 20.
  • the variation in the irradiation marks 20 refers to the amount of deviation from the intended position of the irradiation marks. Having the variation in the irradiation marks 20 within the above range has the advantage that, for example, when the pattern formed by the second openings 14 is recognized by a camera, the outline becomes clear and recognition accuracy can be ensured.
  • the difference between the thickness of the first printed layer 11 at the second opening 14 and the thickness of the first printed layer 11 at other than the second opening is preferably 3.0 ⁇ m or less, more preferably 2.5 ⁇ m or less, and even more preferably 2.3 ⁇ m or less.
  • the film thickness of the first printed layer 11 at the second opening 14 is the film thickness measured at the first printed layer 11 exposed at the second opening 14.
  • the film thickness of the first printed layer 11 other than the second opening 14 it is preferable to use the average value of film thicknesses measured at multiple points in an area excluding 4 mm around the first opening 12 and the first printed layer 11 exposed at the second opening 14.
  • the number of measurement points is preferably, for example, three or more, and is preferably selected without bias within the target area.
  • a decorative layer such as an antiglare layer, an antireflection layer, or an antifouling layer may be provided on the first main surface 10A of the transparent substrate 10.
  • the antiglare layer, antireflection layer, and antifouling layer described below are examples, and may be appropriately changed within the range in which the functions of each layer are maintained.
  • the antiglare layer, antireflection layer, and antifouling layer are not essential components, and some of the antiglare layer, antireflection layer, and antifouling layer may not be provided depending on the configuration of the display cover material 100.
  • the anti-glare layer is provided on the first main surface 10A of the transparent substrate 10, and provides the transparent substrate 10 with anti-glare properties.
  • the anti-glare layer has an uneven shape formed on the first main surface 10A of the transparent substrate 10.
  • the uneven shape may be formed directly on the first main surface 10A of the transparent substrate 10, or may be formed from a layer of a material composition different from that of the transparent substrate 10.
  • the anti-glare layer may also be provided on both the first main surface 10A and the second main surface 10B.
  • the surface roughness (root mean square roughness, RMS) of this uneven shape is preferably 10 nm to 1000 nm, and more preferably 15 nm to 500 nm.
  • the anti-glare layer can be realized by an uneven shape imparted by performing anti-glare treatment and etching treatment on the first main surface 10A of the transparent substrate 10.
  • the anti-glare layer may also be realized by using a coating film in which particles having an arbitrary refractive index are dispersed on the first main surface 10A of the transparent substrate 10, or by forming an uneven shape on the main surface of a transparent resin film to be laminated.
  • the anti-reflection layer reduces the reflectance of the transparent substrate 10, reducing glare caused by reflected light, and when used in a display device, improving the visibility of the display device.
  • the configuration of the anti-reflection layer is not particularly limited as long as it can suppress light reflection, but it may be configured, for example, by alternately stacking a high refractive index layer with a refractive index of 1.9 or more at a wavelength of 550 nm and a low refractive index layer with a refractive index of 1.6 or less at a wavelength of 550 nm.
  • the anti-reflection layer is provided on the first main surface 10A side of the transparent substrate 10, and may be provided directly on the first main surface 10A or on an anti-glare layer. It may also be provided on both the first main surface 10A and the second main surface 10B.
  • the anti-stain layer has the function of suppressing adhesion of various stains such as fingerprints, sweat, and dust, making the stains less noticeable, or making the stains easier to clean, thereby keeping the display surface clean.
  • the anti-stain layer is provided on the first main surface 10A side of the transparent substrate 10, but from the viewpoint of the properties of the anti-stain layer, it is preferable that it is formed on the outermost surface on the first main surface 10A side of the display cover material 100.
  • the anti-stain layer is made of a fluorine-containing compound (a compound having a fluorine-containing organic group) that can impart anti-stain properties, water repellency, and oil repellency.
  • the fluorine-containing compound is preferably a fluorine-containing organic compound, and more preferably a fluorine-containing organosilicon compound.
  • the manufacturing method of the display cover material 100 of this embodiment includes the steps of laminating a first printed layer 11 having a first opening 12 on the second main surface 10B of a transparent substrate 10 having a first main surface 10A and a second main surface 10B, laminating a second printed layer 13 having a different color from the first printed layer 11 on a portion of the surface of the first printed layer 11, and irradiating the surface of the second printed layer 13 with laser light and removing the second printed layer 13 to form a second opening 14 and expose the first printed layer 11 from the second opening 14.
  • Each step will be described in detail below.
  • a transparent substrate 10 having a first main surface 10A and a second main surface 10B is prepared.
  • the transparent substrate 10 is prepared to have the characteristics as described above in (Transparent Substrate).
  • the transparent substrate 10 is preferably glass.
  • the manufacturing method is not particularly limited, but for example, the desired glass raw material is put into a melting furnace, heated and melted at 1500 to 1600°C, refined, and then fed to a molding device to form the molten glass into a flat plate shape and slowly cooled, thereby manufacturing the transparent substrate 10.
  • the glass forming method is not particularly limited, and for example, a downdraw method (e.g., an overflow downdraw method, a slot down method, a redraw method, etc.), a float method, a roll-out method, a press method, etc. can be used.
  • a downdraw method e.g., an overflow downdraw method, a slot down method, a redraw method, etc.
  • a float method e.g., a float method, a roll-out method, a press method, etc.
  • the method may also include a forming process in which the flat glass obtained above is cut into any shape and size, and is heated and curved into a three-dimensional shape.
  • the forming process forms a curved surface on the transparent substrate 10 in the shape described above (transparent substrate).
  • the workpiece may be subjected to processing such as drilling holes or chamfering edges, regardless of whether it is before or after the forming process.
  • the chemical strengthening treatment is preferably performed after bending.
  • the chemical strengthening treatment method is not particularly limited, and the main surface of the transparent substrate is ion-exchanged to form a surface layer in which compressive stress remains. Specifically, at a temperature below the glass transition point, alkali metal ions with a small ionic radius (e.g., Li ions, Na ions) contained in the glass near the main surface of the substrate are replaced with alkali metal ions with a larger ionic radius (e.g., Na ions or K ions for Li ions, and K ions for Na ions). This causes compressive stress to remain on the main surface of the transparent substrate 10, improving the strength of the transparent substrate.
  • alkali metal ions with a small ionic radius e.g., Li ions, Na ions
  • alkali metal ions with a larger ionic radius e.g., Na ions or K ions for Li ions, and K ions for Na ions.
  • a first printed layer 11 is formed on the second main surface 10B of the transparent substrate 10.
  • the first printed layer 11 is preferably formed, for example, by a method of printing ink, and is printed with a design having a first opening 12.
  • the printing method is not particularly limited, but preferred methods include an inkjet method, a screen printing method, and a transfer decoration method.
  • the transparent substrate 10 has a complex curved shape or a curved surface with a bending angle of 45 degrees or more, it is preferable to print by the transfer decoration method.
  • inorganic ink containing a fired ceramic body, etc. and organic ink containing a coloring material such as a dye or pigment and an organic resin, etc. can be used.
  • the ink to be used is preferably heat-curable or photo-curable.
  • the inorganic ink may be, for example, a composition consisting of one or more selected from SiO2, ZnO, B2O3, Bi2O3, Li2O, Na2O, and K2O , one or more selected from CuO , Al2O3 , ZrO2 , SnO2 , and CeO2 , Fe2O3 , and TiO2 .
  • the resin may be at least one selected from the group consisting of acrylic resin, urethane resin, epoxy resin, polyester resin, polyamide resin, vinyl acetate resin, phenolic resin, olefin resin, ethylene-vinyl acetate copolymer resin, polyvinyl acetal resin, natural rubber, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, polyester polyol, polyether polyurethane polyol, and other resins.
  • the solvent may be water, alcohols, esters, ketones, aromatic hydrocarbon solvents, or aliphatic hydrocarbon solvents.
  • isopropyl alcohol, methanol, ethanol, and the like can be used as alcohols
  • ethyl acetate can be used as esters
  • methyl ethyl ketone can be used as ketones.
  • toluene, xylene, ExxonMobil's Solvesso 100 and Solvesso 150, and the like can be used as aliphatic hydrocarbon solvents, and hexane, and the like can be used. Note that these are only examples, and various other printing materials can be used.
  • the organic printing material can be applied to a plate, and then the solvent is evaporated to form a resin layer, creating a printing layer.
  • the ink used in the first printed layer 11 may contain a colorant.
  • the color of the first printed layer 11 is not particularly limited, but from the viewpoint of high light blocking properties, a color with low brightness is preferably used. For example, black, brown, navy blue, etc., and pattern printing such as wood grain may also be used, and the colorant is selected arbitrarily according to the color design of the first printed layer 11. In particular, from the viewpoint of increasing light blocking properties, it is preferable that the ink contains carbon black.
  • the first printed layer 11 may be a single layer, or multiple layers may be laminated. When it is composed of multiple layers, the same ink may be applied multiple times, or different inks may be applied multiple times. For example, the light-blocking properties can be improved by applying multiple layers of the same ink. For example, after a first layer that imparts design is formed on glass, a second layer may be applied with a different ink that has high light-blocking properties.
  • the first printed layer 11 may also have a different number of layers in some parts.
  • an infrared-transmitting region is provided in part of the first printed layer 11, it is possible to form a first layer on the glass that blocks visible light and transmits infrared light, and then form a second layer with even higher light-blocking properties in the region other than the infrared-transmitting region.
  • Laser trimming After the first printed layer 11 is formed, a process (hereinafter also referred to as "laser trimming") may be performed by irradiating a part of the first printed layer 11 arranged on the main surface of the glass substrate with laser light and removing the first printed layer 11 irradiated with the laser light.
  • laser trimming a process
  • the first printed layer 11 is printed by a transfer decoration method, it is preferable to perform this process in order to correct the shape of the first opening 12.
  • the first opening 12 of the desired shape can be easily formed in the exact position, and the inclination of the end of the first printed layer 11 becomes closer to the normal to the main surface, making the boundary between the first opening 12 and the first printed layer 11 clearer, resulting in better visibility when the glass with the first printed layer 11 is used in a display device.
  • Fig. 7 is a schematic diagram showing an example of the configuration of a laser irradiation device that irradiates laser light onto a part of the first printed layer 11. Note that the laser irradiation device and the laser trimming processing method are not limited to the configuration shown in Fig. 7.
  • the laser irradiation device 30 shown in FIG. 7 irradiates the first printed layer 11 with laser light L that is absorbent, thereby subjecting the first printed layer 11 to an ablation process.
  • the laser irradiation device 30 includes a laser oscillator 31, a mirror 32, and a condenser lens 33.
  • the laser oscillator 31 oscillates a laser beam L having a wavelength absorbed by the first printed layer 11 at a predetermined irradiation timing based on a control signal from a control device (not shown).
  • the condenser lens 33 condenses the laser beam L oscillated from the laser oscillator 31 and guides it to the first printed layer 11.
  • the mirror 32 is disposed between the laser oscillator 31 and the condenser lens 33, and directs the optical axis of the laser beam L oscillated from the laser oscillator 31 to the condenser lens 33. As a result, as shown in FIG. 7, the excess portion 11B of the first printed layer 11 irradiated with the laser beam L is removed, and an end portion 11A is formed.
  • the principal surface to which the laser light is irradiated may be either the first principal surface 10A or the second principal surface 10B. However, it is preferable to irradiate the laser light from the first principal surface 10A side, which is opposite the surface on which the first printing layer 11 is arranged, as shown in Figure 7, as this makes it easier to remove unnecessary portions.
  • the laser trimming conditions are set as follows:
  • the wavelength of the laser light L is appropriately selected depending on the absorption wavelength of the colorant contained in the first printed layer 11, but is preferably 300 to 1100 nm, and more preferably 500 to 1100 nm.
  • the irradiation interval of the laser light L is preferably less than 100 ⁇ m, and more preferably less than 70 ⁇ m.
  • the scanning speed is preferably 1000 to 8000 mm/s, and more preferably 1000 to 4000 mm/s.
  • the irradiation interval is the interval of the laser light intermittently irradiated onto the first printed layer 11 when scanning the first printed layer 11, and is calculated by dividing the scanning speed by the irradiation frequency of the laser light L.
  • the second printed layer 13 is formed, for example, by a method of printing ink.
  • the printing method is not particularly limited, but preferred methods include an inkjet method and a pad printing method, and from the viewpoint of productivity, the inkjet method is more preferred, and the inkjet method is preferably a continuous type.
  • the ink that can be used may be an inorganic ink containing a fired ceramic body, or an organic ink containing a colorant such as a dye or pigment and an organic resin. From the viewpoint of ease of removal by irradiation with laser light, an organic ink is preferably used.
  • a resin that is not thermosetting or photosetting is preferably used as the main component of the ink, and for example, a non-crosslinking resin is preferably used.
  • the ink used in the second printed layer 13 may contain a colorant.
  • the color of the second printed layer 13 is not particularly limited, but a color that is relatively brighter than the first printed layer 11 is preferably used, and the colorant is selected arbitrarily according to the design of the second printed layer 13. In particular, from the viewpoint of achieving a brighter color, it is preferable that the second printed layer 13 contains less carbon black than the first printed layer 11 or does not contain carbon black, and it is preferable that the second printed layer 13 contains a white material such as titanium oxide.
  • Fig. 8 is a schematic diagram showing an example of a laser irradiation device 40.
  • the laser irradiation device 40 irradiates the second printed layer 13 with laser light L2 that is absorbent, thereby subjecting the second printed layer 13 to ablation processing.
  • the laser irradiation device 40 includes a laser oscillator 41, a mirror 42, and a condenser lens 43.
  • the laser oscillator 41 oscillates a laser beam L2 having a wavelength absorbed by the second printed layer 13 from the second main surface B side toward the second printed layer 13 at a predetermined irradiation timing based on a control signal from a control device (not shown).
  • the condenser lens 43 condenses the laser beam L oscillated from the laser oscillator 41 and guides it to the second printed layer 13.
  • the mirror 42 is disposed between the laser oscillator 41 and the condenser lens 43, and directs the optical axis of the laser beam L2 oscillated from the laser oscillator 41 toward the condenser lens 43.
  • the mirror 42 is preferably a galvanometer scanner (galvanometer mirror), and by rotating the galvanometer mirror around its axis, the laser light L2 deflected by the galvanometer mirror scans the second printing layer 13.
  • the scanning method of the laser light is not limited to this, and for example, a scan head equipped with a mirror 42 and a focusing lens may be used to scan in the XY directions, which are two orthogonal axial directions.
  • a galvanometer mirror as the mirror 42, the variation in the irradiation marks 20 can be suppressed, the recognizability of the pattern formed by the second opening 14 by a camera, etc. can be improved, and the positional accuracy of the second opening 14 can be further improved.
  • the wavelength of the laser light L2 is not particularly limited, but is preferably 300 nm to 1100 nm.
  • the oscillation method of the laser light L2 is also not particularly limited, but pulse oscillation is preferable, and for example, the pulse width is preferably 1 ns to 100 ns. Within the above range, ablation can be effectively generated, and the second printing layer 13 can be efficiently removed.
  • the scanning speed is preferably 100 mm/s to 8000 mm/s, and more preferably 1000 mm/s to 4000 mm/s.
  • the output of the laser light L2 is preferably 10 W or less.
  • the spot diameter of the laser light L2 is preferably 10 ⁇ m or more and 200 ⁇ m or less.
  • the irradiation interval of the laser light L2 is preferably 10 ⁇ m or more and 200 ⁇ m or less, and more preferably 0.5 times or more and 1.3 times or less of the spot diameter, and even more preferably 0.5 times or more and 1.0 times or less.
  • the irradiation interval of the laser light 0.5 times or more the spot diameter, overlapping of the irradiation marks 20 is suppressed, damage to the first printed layer 11 is suppressed, and light leakage at the second opening 14 is suppressed.
  • the irradiation interval of the laser light 10 times or less the spot diameter it is possible to suppress the second printed layer 13 from remaining without being removed.
  • a decorative layer such as an antiglare layer, an antireflection layer, or an antifouling layer may be formed on the first main surface 10A or the first main surface 10A and the second main surface 10B of the transparent substrate 10.
  • the antiglare layer, the antireflection layer, and the antifouling layer are formed by a known method as appropriate.
  • the order of forming the antiglare layer, the antireflection layer, and the antifouling layer is not particularly limited, but it is preferable that the antiglare layer is formed before the formation of the first printed layer 11, the antireflection layer is formed after the formation of the second opening 14, and the antifouling layer is formed after the formation of the antireflection layer.
  • a display device is manufactured by bonding the display cover material 100 formed by the above manufacturing method to a display panel 3.
  • the display panel 3 is bonded to the second main surface 10B side of the display cover material 100.
  • the pattern formed by the second openings 14 on the first printed layer 11 is used as an alignment mark to align with the display panel 3.
  • the display cover material 100 of this embodiment has high positional accuracy of the alignment mark, making it possible to suppress defects during bonding and improve yield.
  • a display cover material comprising a transparent substrate having a first main surface and a second main surface, and a first printed layer laminated on the second main surface and having a first opening, wherein a second printed layer is laminated on a portion of a surface of the first printed layer, the second printed layer having a different color from the first printed layer, the second printed layer having a second opening, the first printed layer being exposed at the second opening, and a plurality of irradiation marks being formed on the surface of the first printed layer at the second opening.
  • a display cover material according to any one of (1) to (7), in which the first printed layer contains carbon black and the second printed layer does not contain carbon black, or contains carbon black and the carbon black content of the second printed layer is less than the carbon black content of the first printed layer.
  • An in-vehicle display device comprising the display cover material described in (9) or (10) and a display.
  • a method for manufacturing a display cover material comprising: laminating a first printed layer having a first opening on a second main surface of a transparent substrate having a first main surface and a second main surface; laminating a second printed layer having a color different from that of the first printed layer on a portion of a surface of the first printed layer; irradiating a surface of the second printed layer with laser light and removing the second printed layer to form a second opening and expose the first printed layer through the second opening.
  • a method for forming an in-vehicle display device comprising bonding the display cover material described in any one of (1) to (10) to a display, the bonding of the display being performed by aligning the display and the display cover material using a pattern formed by the second opening as an alignment mark.
  • Test Example 1 is a comparative example, and Test Examples 2 to 4 are working examples.
  • Test Example 1 Aluminosilicate glass (Dragontrail (registered trademark) manufactured by AGC) was prepared as the transparent substrate 10.
  • the first printed layer 11 was made of black ink containing carbon black (Photoblack manufactured by Toray Industries, Inc.), which was applied to a thickness of 6.4 ⁇ m using a spin coater, and then heated at 230° C. for 30 minutes to be cured.
  • the second printed layer 13 was made of white ink containing titanium oxide (MW460 manufactured by Markem-Imaje), and a shape having a second opening 14 was directly formed by pad printing.
  • the shape of the second printed layer 13 was a rectangle measuring 40 mm x 40 mm.
  • the second opening 14 was in the shape of the letters "AGC.” (Test Examples 2 to 4)
  • the conditions for forming the transparent substrate 10 and the first printed layer 11 were the same as those in Example 1.
  • the second printed layer 13 was printed by a continuous inkjet method using a white ink containing titanium oxide (MW460 manufactured by Markem-Imaje). The ink did not contain carbon black, and no curing process was performed after printing.
  • the shape of the second printed layer 13 was a rectangle of 40 mm x 40 mm. Next, under the conditions below and those shown in Table 1, laser light was irradiated onto the second printed layer 13 to remove the second printed layer 13.
  • the second opening 14 was formed in the shape of the letters "AGC.”
  • Oscillator Nanosecond pulse laser (Keyence MD-X1520)
  • Oscillation method Pulse oscillation Scan mechanism: Galvano mirror Light wavelength: 1064 nm Output: 3.0W Oscillation frequency: 8kHz In-plane scanning speed: 650 mm/s
  • the display cover material 100 created as described above was evaluated for positional accuracy, irradiation marks, and film thickness of the first printed layer 11.
  • the surface of the second opening 14 was photographed with an optical microscope (Keyence Digital Microscope VHX6000). The image is shown in FIG. 9.
  • the white circular pattern was regarded as the irradiation mark, and the diameter of the irradiation mark and the distance between the irradiation marks were measured.
  • the variation was obtained from the standard deviation of the error for the coordinates by repeatedly irradiating the same coordinates with the laser light.
  • the maximum reduction in thickness of the first printed layer 11 before and after irradiation with laser light was calculated by comparing the thickness of the first printed layer 11 other than the second opening 14 with the thickness of the first printed layer 11 at the second opening 14 using the following procedure.
  • a non-contact three-dimensional measuring device MIAAKA KOKI NH-3MAS was used to scan the laser probe so as to pass through the first printed layer 11 and the exposed glass surface by a stage scanning type laser probe method, thereby measuring the film thickness of the first printed layer 11.
  • the scanning section of the laser probe was set to 2 mm, and the average film thickness in the scanning section was calculated.
  • the scanning section of the laser probe was set to 2 mm, and the minimum film thickness value in the scanning section was calculated.
  • the difference between the average film thickness of the first printed layer 11 other than the second opening 14 measured above and the minimum film thickness value at the second opening 14 was adopted as the maximum film thickness reduction of the first printed layer before and after irradiation with laser light.
  • Test Examples 2 to 4 in which the second opening 14 was formed by irradiating with laser light, showed improved positional accuracy compared to Test Example 1, in which the second opening 14 was formed by pad printing. Furthermore, in test example 3, in which the irradiation interval in laser light irradiation was 0.5 times the spot diameter or more and the irradiation mark interval was greater than 1.0 times the irradiation mark diameter, the maximum film thickness reduction of the first printed layer 11 before and after irradiation was able to be reduced to 3.0 ⁇ m or less, and damage to the first printed layer 11 due to laser light irradiation was suppressed.
  • test example 4 in which the irradiation interval in the laser light irradiation was 1.3 times or less the spot diameter and the irradiation mark interval was 2.6 times or less the irradiation mark diameter, the remaining area of the second printing layer 13 could be reduced to less than 30%, and a pattern could be formed by the second opening.
  • test example 3 in which the irradiation interval in the laser light irradiation was 1.0 times or less the spot diameter and the irradiation mark interval was 2.0 times or less the irradiation mark diameter, the remaining area of the second printing layer 13 could be reduced to 0%, and the pattern created by the second opening was clearer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Instrument Panels (AREA)
  • Laminated Bodies (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
PCT/JP2023/041616 2022-11-21 2023-11-20 ディスプレイカバー材、車載用表示装置、ディスプレイカバー材の製造方法及び車載用表示装置の製造方法 Ceased WO2024111546A1 (ja)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016057322A (ja) * 2014-09-05 2016-04-21 三菱電機株式会社 表示装置用前面板および当該表示装置用前面板を備えた表示装置
KR20160080491A (ko) * 2014-12-29 2016-07-08 엘지디스플레이 주식회사 표시장치 및 이의 제조방법
JP2019202705A (ja) * 2018-05-25 2019-11-28 株式会社三和スクリーン銘板 パネル部材の製造方法
JP2020008758A (ja) * 2018-07-10 2020-01-16 三菱電機株式会社 表示装置
JP2022017979A (ja) * 2020-07-14 2022-01-26 株式会社ジャパンディスプレイ 表示装置
JP2022082111A (ja) * 2020-11-20 2022-06-01 大日本印刷株式会社 加飾シート付き表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016057322A (ja) * 2014-09-05 2016-04-21 三菱電機株式会社 表示装置用前面板および当該表示装置用前面板を備えた表示装置
KR20160080491A (ko) * 2014-12-29 2016-07-08 엘지디스플레이 주식회사 표시장치 및 이의 제조방법
JP2019202705A (ja) * 2018-05-25 2019-11-28 株式会社三和スクリーン銘板 パネル部材の製造方法
JP2020008758A (ja) * 2018-07-10 2020-01-16 三菱電機株式会社 表示装置
JP2022017979A (ja) * 2020-07-14 2022-01-26 株式会社ジャパンディスプレイ 表示装置
JP2022082111A (ja) * 2020-11-20 2022-06-01 大日本印刷株式会社 加飾シート付き表示装置

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