Display cover material

Abstract

This display cover material (10) is provided with a substrate (20), an anti-glare layer (30) provided on the first main surface (20A) side of the substrate (20), and a printed layer provided on the second main surface (20B) of the substrate (20). The first main surface (20) has a first printed section (61), a second printed section (62), a first opening (71), and a second opening (72). If the average value of the glossiness of the A region on the second printed section (62) is G1Aave and the average value of the C region is G1Cave, | G1Aave-G1Cave | > = 7, and | G2A-G2C | / BW < = 0.4 is satisfied, where G2A is a measured value of the glossiness at a predetermined position on the A region side, G2C is a measured value at a predetermined position on the C region side, and BW (mm) is a value obtained by adding 10 mm to the width of the B region.

Description

Technical Field

[0001] The present invention relates to a display covering material. Background Art

[0002] In recent years, image display devices have been increasingly used in various devices such as navigation systems and speedometers installed in vehicles. To improve safety and appearance, the cover components of such image display devices are required to reduce reflection of external light and prevent the image from being obscured by reflections of external light. One method for preventing reflections and reflections on the surface of the cover material is to apply an anti-glare layer with a concave-convex surface structure to the display surface of the image display device, thereby diffusely reflecting external light and obscuring the reflected image.

[0003] On the other hand, it is known that there is also a need to control the anti-glare performance according to the installation position in the vehicle, the shape of the cover material, the display content (type of information, color tone), the state of the curved surface, etc., especially in the case of front panels for displays used in vehicles, rather than imparting uniform anti-glare performance to the entire surface of the substrate.

[0004] Patent Document 1 discloses a technique in which an anti-glare layer is provided on a transparent substrate of a display and the optical properties of the anti-glare layer, such as specular glossiness, are varied depending on the region.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-024240 Summary of the Invention

[0008] However, as displays become larger, there is a growing demand for more distinct anti-glare layer properties for each region within the display. For example, as a method other than Patent Document 1 for differentiating the properties of an anti-glare layer, there is a method of forming an anti-glare layer independently for each region by shielding each region. However, if this method is used to differentiate the properties of the anti-glare layer for each region, the boundaries between regions with different anti-glare layer properties become visible, which reduces design quality.

[0009] The present invention has been made in view of the above, and an object thereof is to provide a display cover material having an anti-glare layer with different properties depending on the position and excellent design properties of the boundary portion.

[0010] The display cover material of the present invention comprises: a substrate having a first main surface and a second main surface, an anti-glare layer provided on the first main surface side, and a printed layer provided on the second main surface;

[0011] The first main surface has a printed portion and at least two openings, wherein the printed portion is a region on the corresponding second main surface where the printed layer is formed, and the at least two openings are regions on the corresponding second main surface where the printed layer is not formed.

[0012] The at least two openings include a first opening and a second opening adjacent to the first opening.

[0013] The printing portion includes a first printing portion located between the first opening and the second opening, and a second printing portion located along the outer periphery of the first main surface;

[0014] On the first main surface, a line extending from a boundary line between the first opening and the first printed portion is defined as line LA, and a line extending from a boundary line between the first printed portion and the second opening is defined as line LC.

[0015] On the first main surface, the area on the line LA near the first opening is defined as area A, the area between the line LA and the line LC is defined as area B, and the area on the line LC near the second opening is defined as area C.

[0016] On the second printed portion, the 60° glossiness was measured at intervals of 10 mm on a line P extending from the area A to the area C, passing through the middle of the outer periphery of the first main surface and the outer periphery of the opening. The average value in the area A was defined as G1. A ave, set the average value in the above C area to G1 C ave, then it satisfies

[0017] |G1 A ave-G1 C ave|≥7,

[0018] The measured value of the 60° glossiness at a position 5 mm from the line LA to the A region on the line P is defined as G2. A The measured value of the 60° glossiness at a position 5 mm from the line LC to the C region on the line P is defined as G2. C , add 10mm to the width of the line P in the B area and set it as B W (mm), meet the

[0019] |G2 A -G2 C | / B W ≤0.4.

[0020] According to the present invention, in a display cover material, even when the glossiness varies between regions, it is possible to suppress visibility of the boundaries between regions, thereby preventing degradation of the design of the display. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram showing a vehicle-mounted display device according to this embodiment.

[0022] Figure 2 It is a top view of the display cover material according to this embodiment.

[0023] Figure 3 It is along Figure 2 Cross-sectional view of the P-P line.

[0024] Figure 4 It is along Figure 2 Cross-sectional view of the P2-P2 line.

[0025] Figure 5 This is a schematic cross-sectional view showing an example of a display cover material having a curved shape.

[0026] Figure 6 This is a schematic diagram illustrating a method for forming the anti-glare layer of the display cover material according to the present embodiment, and is a diagram showing the formation process as viewed from above.

[0027] Figure 7 Observed from the side Figure 6 Diagram of the formation process.

[0028] Figure 8 This is a graph showing how the 60° glossiness changes with the long side in an example of a display cover material.

[0029] Figure 9 This is a graph showing how the 60° glossiness changes with the long side in an example of a display cover material.

[0030] Figure 10 This is a graph showing how the 60° glossiness changes with the long side in an example of a display cover material.

[0031] Figure 11 This is a graph showing how the 60° glossiness changes with the long side in an example of a display cover material. DETAILED DESCRIPTION

[0032] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to this embodiment. Furthermore, when there are multiple embodiments, embodiments constructed by combining the various embodiments are also included. Numerical values ​​include rounded-off ranges.

[0033] (In-vehicle display device)

[0034] Figure 1 Schematic diagram showing the vehicle-mounted display device according to this embodiment. Figure 1 As shown, an in-vehicle display device 2 is provided in front of a steering shaft 1 in the front portion of the vehicle interior. As an example, the in-vehicle display device 2 is provided with three display areas. For example, a car navigation screen 3 is displayed in the first display area, various instruments such as a speedometer 4 are displayed in the second display area, and a start button 5 is displayed in the third display area. The in-vehicle display device 2 includes a display and a display cover material 10 according to this embodiment as a cover material for the display surface (see FIG. 1 ). Figures 2 to 4 ). It should be noted that the display cover material 10 is not limited to being used as a cover material for covering the surface of a vehicle-mounted display, and can also be used for other displays.

[0035] (Display cover material)

[0036] Figure 2 It is a plan view of the display cover material 10 according to the embodiment. Figure 3 It is along Figure 2 The cross-sectional view of the P-P line, Figure 4 It is along Figure 2 Cross-sectional view of the P2-P2 line. Figure 3 and Figure 4 It represents the cross section obtained by cutting the display cover material 10 along the plate thickness direction. Figure 3 and Figure 4 The display cover material 10 is shown when viewed in a cross section in the thickness direction.

[0037] The display cover material 10 according to this embodiment is a cover material for a display including a vehicle-mounted display. Figure 3 and Figure 4 As shown, the display cover material 10 comprises a substrate 20, an anti-glare layer 30, and a printed layer 40. The substrate 20 has a first main surface 20A and a second main surface 20B that are opposed to each other. The anti-glare layer 30 is provided on the first main surface 20A side, and the printed layer 40 is provided on the second main surface 20B. It should be noted that in this embodiment, the display cover material 10 comprises three layers: the substrate 20, the anti-glare layer 30, and the printed layer 40. However, this is not limited to this three-layer structure. For example, other layers such as an anti-reflection layer and an anti-fouling layer may also be formed.

[0038] When the display cover material 10 is mounted on a display device, the second main surface 20B is attached to the display panel of the vehicle-mounted display device 2. Figure 2 As shown, the display cover material 10 of this embodiment has a rectangular shape with long sides and short sides when viewed from above, but the shape is not limited to a rectangle. For example, the outer periphery of the display cover material 10 may be curved.

[0039] (Substrate)

[0040] The substrate 20 is, for example, a transparent glass plate or resin plate. Examples of glass plates include soda-lime glass, aluminosilicate glass, borosilicate glass, glass-ceramics, and quartz glass. The substrate 20 may also be chemically strengthened glass. The material of the substrate 20 is not limited to glass; for example, a transparent resin plate primarily composed of polyester, polycarbonate, or the like, such as an acrylic plate or PET plate, may also be used.

[0041] A typical method for obtaining chemically strengthened glass by subjecting glass to a chemical strengthening treatment is to immerse the glass in a KNO3 molten salt, perform an ion exchange treatment, and then cool the glass to near room temperature. Treatment conditions such as the temperature of the KNO3 molten salt and the immersion time can be set so that the surface compressive stress and the thickness of the compressive stress layer reach the desired values.

[0042] Examples of the glass include soda-lime glass and aluminosilicate glass (SiO 2 —Al 2 O 3 —Na 2 O-based glass). Among these, aluminosilicate glass is preferred from the viewpoint of strength.

[0043] As a glass material, for example, there can be mentioned a glass material which, expressed in molar percentage on an oxide basis, contains 50% to 80% of SiO2, 1% to 20% of Al2O3, 6% to 20% of Na2O, 0% to 11% of K2O, 0% to 15% of MgO, 0% to 6% of CaO and 0% to 5% of ZrO2.

[0044] Aluminosilicate glass-based chemically strengthened glass can also be suitably used, and an example thereof is “Dragon Trail (registered trademark)” manufactured by AGC Corporation.

[0045] In the present embodiment, the substrate 20 is in the shape of a flat plate, but the shape of the substrate is not limited to a flat plate and may be curved.

[0046] The curved shape may have a single bending axis or a complex curve with multiple bending axes. The substrate 20 may be bent by cold forming or heat forming, but heat forming is preferred. By forming the anti-glare layer 30 described below on the substrate 20 that has been bent by heat forming, a display cover material 10 having a curved shape can be produced.

[0047] An example of a display cover material having a curved shape is shown in Figure 5 (a)~(d). Figure 5 (a) to (d) show display cover materials 10-1 to 10-4 in cross-section in the thickness direction, respectively. Figure 5In the figure, the anti-glare layer 30 and the printed layer 40 are omitted, and therefore the shapes of the display cover materials 10 - 1 to 10 - 4 correspond to the shapes of the substrates 20 - 1 to 20 - 4 .

[0048] Display cover materials 10-1 to 10-4 are formed so that the heights of regions A and C of the first main surface 20A differ when viewed in a cross-section along the thickness direction. For example, when used in an in-vehicle display device 2, different anti-glare properties are required for the driver's seat and the passenger seat. Display cover materials of this configuration are suitable for large in-vehicle display devices 2 that extend from the center of the vehicle to the driver's seat.

[0049] For example, if the vehicle-mounted display device 2 includes one display in the center of the vehicle and one display in front of the driver's seat, the height of the area located in the center of the vehicle, as viewed in a cross-section along the thickness of the display cover material, is higher, while the height of the area located in front of the driver's seat is lower. This makes it easier to distinguish between the two displays from the driver's seat. Here, when viewed in a cross-section along the thickness of the display cover material, a higher height area means that when the vehicle display device, with the display cover material attached, is mounted in the vehicle, the area protrudes more into the vehicle interior, while a lower height area means that the area protrudes less into the vehicle interior.

[0050] In this case, the required anti-glare properties for each area of ​​the display cover material vary depending on the content of the information displayed on the two displays and the relationship between the display installation positions and the interior light of the vehicle.

[0051] For example, the 60° glossiness is set low for the area in front of the driver's seat, while the 60° glossiness is set high for the area in the center of the vehicle. Setting the 60° glossiness for each area of ​​the display cover material in this way is believed to suppress the reflection of the speedometer displayed on the display in front of the driver's seat, while also improving the clarity of information such as maps displayed on the display in the center of the vehicle.

[0052] The display cover material can also be a large item extending from the passenger seat to the driver's seat. In addition, in the display cover materials 10-1 to 10-4, although the height difference when observed in the cross-section in the thickness direction is only one level, it is not limited to this and can also be a method of changing the height difference to more than two levels.

[0053] Display cover materials 10-1 to 10-4 all have an S-shaped cross-section. Regions A and C of display cover material 10-1 are both flat, connected via region B, which serves as an inflection point. Region A of display cover material 10-2 is concave, while region C is flat. Regions A and C are connected via region B, which serves as an inflection point. Region A of display cover material 10-3 is flat, while region C is convex. Regions A and C are connected via region B, which serves as an inflection point. Region A of display cover material 10-4 is concave, while region C is convex. Regions A and C are connected via region B, which serves as an inflection point. The shapes shown are not limited to those shown. The shapes of regions A and C can be appropriately selected based on the vehicle's installation location, display content, and other factors. Regions A and C can each be flat, concave, or convex, and their height relationship can be reversed. When the vehicle display device 2 equipped with the display cover materials 10 - 1 to 10 - 4 is mounted in a vehicle, the first main surface 20A side where the anti-glare layer is formed faces the interior of the vehicle, that is, an occupant such as a driver.

[0054] The thickness of the substrate 20 is not particularly limited. However, when a glass plate is used as the substrate 20, the thickness is generally preferably 5 mm or less, and more preferably 3 mm or less, for efficient chemical strengthening. Furthermore, when the substrate 20 is used as a cover glass for an in-vehicle display such as a car navigation system, the thickness of the glass plate is preferably 0.2 mm or more, more preferably 0.8 mm or more, and even more preferably 1 mm or more, from the perspective of strength.

[0055] The size of the substrate can be appropriately selected depending on the application. For example, when used as a cover material for an in-vehicle display device, the short side length is, for example, 50 mm to 500 mm, preferably 100 mm to 300 mm, and the long side length is, for example, 50 mm to 1500 mm, preferably 100 mm to 1200 mm.

[0056] (Anti-glare layer)

[0057] The anti-glare layer 30 is provided on the first principal surface 20A of the substrate 20 to impart anti-glare properties to the substrate 20. The anti-glare layer 30 has a concavo-convex pattern formed on the first principal surface 20A of the substrate 20. This concavo-convex pattern can be formed directly on the first principal surface 20A of the substrate 20 or formed in a layer made of a different material from the substrate 20. Furthermore, the concavo-convex pattern can be provided on both the first principal surface 20A and the second principal surface 20B. The surface roughness (average roughness, Ra) of this concavo-convex pattern is preferably 10 nm to 100 nm, more preferably 20 nm to 70 nm. The anti-glare layer 30 can be achieved by applying an anti-glare treatment and etching to the first principal surface 20A of the substrate 20. Alternatively, this concavo-convex pattern can be achieved by using a coating film in which particles having an arbitrary refractive index are dispersed on the first principal surface 20A of the substrate 20, or by forming the concavo-convex pattern on the principal surface to which a transparent resin film is laminated. The glossiness described later can be adjusted by using the concave and convex shape. Generally speaking, the smaller the Ra, the greater the glossiness, and the larger the Ra, the lower the glossiness.

[0058] When a coating film is used, the anti-glare layer 30 is formed on the first main surface 20A and is a film mainly composed of silicon dioxide forming a concavo-convex shape. Preferably, the anti-glare layer 30 mainly contains silicon dioxide and CH3 (CH2) n Si-based, -Si(CH2) n Si-based or CF3 (CH2) n Si-based, etc. Here, n represents an integer from 1 to 10. Furthermore, the flaky particles (C) are dispersed in the matrix to form an anti-glare film. The method for forming the anti-glare film 30 using this anti-glare film-forming liquid composition will be described in detail later.

[0059] The anti-glare layer 30 is formed, for example, by spraying a liquid composition for forming an anti-glare film onto a substrate by spraying or the like to form a coating film having irregularities, wherein the liquid composition for forming an anti-glare film comprises: tetraalkoxysilane, CH3(CH2) n Si-based, -Si(CH2) n Si-based or CF3 (CH2) n A silica precursor (A) of an organosilane such as Si-based, flaky particles (B) and a liquid medium (C). In this case, the silica precursor (A) forms a mixture mainly composed of silica and containing CH3 (CH2) n Si-based, -Si(CH2) n Si-based or CF3 (CH2) n Si-based matrix.

[0060] In addition, "containing silicon dioxide as a main component" means containing 50% by mass or more of silicon dioxide.

[0061] (Printing layer, printing part, opening part)

[0062] The printed layer 40 is provided on the second main surface 20B of the substrate 20. The printed layer 40 is not provided on the entire second main surface 20B, but is partially formed on the second main surface 20B. Figure 2 As shown, the first main surface 20A includes a printed portion 60, which is an area on the opposite second main surface 20B where the printed layer 40 is formed, and an opening 70, which is an area on the opposite second main surface 20B where the printed layer 40 is not formed. The printed portion 60 on the first main surface 20A can also be said to be an area where the printed layer 40 formed on the second main surface 20B can be seen when visually observed from the first main surface 20A. It should be noted that, from the perspective of scratch resistance and design, it is not preferable to form the printed layer 40 on the first main surface 20A.

[0063] At least two openings 70 are provided, including a first opening 71 and a second opening 72 located adjacent to each other. In this example, the first opening 71 and the second opening 72 are adjacent to each other along the longitudinal direction of the display cover material 10 and each has a rectangular shape when viewed from above. The number of openings is not limited to two and may be three or more, and the shapes of the openings are not limited to rectangles. For example, the openings may be a trapezoid or other quadrilateral.

[0064] In addition, at least two or more openings 70 (the first opening 71 and the second opening 72) are provided, for example, with each having an area of ​​2500 mm. 2 With this configuration, the display image can be displayed through the opening 70 .

[0065] The printing section 60 includes a first printing section 61 located between a first opening 71 and a second opening 72, and a second printing section 62 located along the outer periphery of the first main surface 20A. In this example, the first printing section 61 is arranged in a strip-like shape in the center of the longitudinal direction of the display cover material 10, and the second printing section 62 is arranged in a rectangular ring-like shape along the entire outer periphery of the first main surface 20A. In this example, the first opening 71 and the second opening 72 are arranged so that the sides are parallel to the respective boundary lines of the first printing section 61. In other words, the boundary lines between the first opening 71 and the first printing section 61, and the boundary lines between the first printing section 61 and the second opening 72 have parallel portions that are parallel to each other. The shapes of the first printing section 61 and the second printing section 62 are not limited to those shown in the figure. The first printed portion 61 only needs to be located between the first opening 71 and the second opening 72 , and the second printed portion 62 only needs to be located at least in a portion of the outer periphery of the first main surface 20A.

[0066] The printing section 60 is located so as to surround the first opening 71 and the second opening 72. In this example, the first opening 71 and the second opening 72 are areas of the first main surface 20A excluding the printing section 60. The opening 70 serves to display the components of the vehicle-mounted display device 2 (in the vehicle). Figure 1 In this example, the printed portion 60 serves as a display area for the car navigation screen 3, speedometer 4, and start button 5. The printed portion 60 is formed to conceal, for example, wiring components located around the periphery of the in-vehicle display device 2 through the printed layer 40, thereby preventing the portion outside the opening 70 from being visible to the viewer, thereby improving the design of the display device. Furthermore, the printed layer 40 can suppress back reflections from the display cover material 10.

[0067] The printed layer 40 can be formed, for example, by printing ink. While the printing method is not particularly limited, preferred methods include inkjet printing, screen printing, and transfer printing. Any ink can be used without particular limitation. Examples of inks include inorganic inks containing sintered ceramics, and organic inks containing colorants such as dyes and pigments and organic resins. While the printed layer 40 is formed in black, for example, it is not limited to black, and patterns such as wood grain can also be printed, as long as the light-shielding properties are high.

[0068] The printed layer 40 is formed using the above-mentioned printing method to have a film thickness (thickness) greater than 2.0 μm. The film thickness of the printed layer 40 is an average thickness. If the film thickness of the printed layer 40 is greater than 2.0 μm, the light-shielding property of the printed layer 40 is sufficient, which can ensure proper recognition and prevent poor contact between various components and the printed surface. The film thickness is preferably 20.0 μm or less. If the film thickness is 20.0 μm or less, when the substrate 20 is bonded to the display panel of the vehicle-mounted display device 2 using an optical adhesive, it is less likely to cause bubbles to remain due to printing steps. The lower limit of the film thickness of the printed layer 40 is preferably 2.5 μm or more, more preferably 3.0 μm or more, further preferably 5.0 μm or more, and particularly preferably greater than 5.0 μm. In addition, the upper limit is more preferably 15.0 μm or less. That is, the film thickness is preferably greater than 2.0 μm and 20.0 μm or less, more preferably 5.0 μm to 15.0 μm, and even more preferably greater than 5.0 μm and 15.0 μm.

[0069] (Glossiness)

[0070] Next, the glossiness that the display cover material 10 should satisfy, so-called glossiness, will be described. The display cover material 10 of this embodiment specifies the glossiness that should be satisfied according to the region. As a premise for determining the region, for example, Figure 2 、 Figure 4 As shown, line LA, line LC, Figure 2The shown area A, area B, area C, and line P are defined as follows.

[0071] Line LA: A line extending from the boundary line between the first opening 71 and the first printed portion 61 on the first main surface 20A.

[0072] Line LC: A line extending from the boundary line between the first printed portion 61 and the second opening 72 on the first main surface 20A.

[0073] Region A: A region on the first main surface 20A closer to the first opening 71 than the line LA

[0074] ・Area B: The area between lines LA and LC

[0075] Region C: Region closer to the second opening 72 than the line LC

[0076] Line P: An extension line on the second printed portion 62 that passes through the middle of the outer periphery of the first main surface 20A and the outer periphery of the opening 70 and extends from area A to area C.

[0077] Under the above definition, the display cover material 10 is on line P, at points Q spaced 10 mm apart. A The average value of the 60° glossiness measured in the A region is set as G1. A ave, on line P, at points Q with a spacing of 10 mm C The average value of the C region on G1 C When ave, the following formula (1) is satisfied.

[0078] |G1 A ave-G1 C ave|≥7 ・・・(1)

[0079] Here, 60° gloss refers to so-called "60° specular gloss," measured using the method specified in JIS Z8741:1997 for 60° specular gloss. Note that since the measurement is performed on the first principal surface 20A and the area where the printed layer is formed on the corresponding second principal surface 20B, the measurement is performed with the reflective component on the second principal surface side of the cover material eliminated. Lower 60° specular gloss indicates better anti-glare properties, while higher 60° specular gloss indicates better visibility of the displayed image.

[0080] In addition, as the average value, the A The arithmetic mean of the 60° gloss measured at

[0081] In this embodiment, as shown in formula (1), the glossiness differs by a predetermined amount between region A and region C. That is, the anti-glare effect due to diffuse reflection of external light differs between region A and region C, and regions with different anti-glare effects can be provided within a single display cover material 10 .

[0082] In addition, for the display cover material 10, a point S is positioned 5 mm from the line LA on the line P to the side of the A region. A The measured glossiness at 60° is set as G2 A , from line LC on line P to point S, which is 5 mm to the side of area C C The measured glossiness at 60° is set as G2 C , add 10mm to the width W of line P in area B and set it as B W (mm) (=W+10mm), the following formula (2) is satisfied.

[0083] |G2 A -G2 C | / B W ≤0.4 ・・・(2)

[0084] Formula (2) represents the value obtained by adding the width of the B area (=B W ), the difference between the glossiness near area B in area A and the glossiness near area B in area C is small, that is, the change in glossiness from area A to area C is slow.

[0085] By satisfying the formula (2), the change in glossiness is natural and does not feel out of place, and the observer is less likely to notice the change in glossiness in the B region, thereby improving the design quality.

[0086] The display cover material 10 of this embodiment differentiates the optical properties of the anti-glare layer according to the region within the display. Specifically, as shown in formula (1), by providing a predetermined or greater difference in glossiness between region A and region C, a single display cover material 10 is provided with multiple regions having different anti-glare effects.

[0087] In particular, for large displays used in vehicle-mounted display devices 2, the required anti-glare properties can vary depending on the location in the vehicle, the shape of the covering material, the displayed content (type of information, color tone), the curved surface, and other factors. For example, for displays used for driver assistance, from the perspective of ensuring safety, it is preferable to set the glossiness to a low level to improve anti-glare properties in order to suppress reflections of external light even when strong external light is incident. On the other hand, it is believed that since the display on the passenger seat side prefers a clear image, the glossiness is set higher than that on the driver's seat, thereby improving anti-glare properties and the legibility (clarity) of the displayed image. The display covering material 10 of this embodiment imparts different glossiness to each area, and therefore, by being applied to a display, the added value of the display can be increased.

[0088] If the characteristics of the anti-glare layer differ depending on the region, the boundary between the regions will be more easily visible, and the design may be reduced. However, in this embodiment, as shown in formula (2), the value obtained by adding the width W of the region B (=B W ), the difference between the glossiness near area B on the A area side and the glossiness near area B on the C area side is small, that is, the change in glossiness within the range from area A through area B to area C is not sharp, thereby suppressing the recognition of the boundary between areas and preventing the design of the display from being reduced.

[0089] In the display cover material 10, particularly in region B, it is preferred that there be no linear unevenness on the first main surface 20A. Linear unevenness refers to the situation where, due to differences in reflection and scattering from the surroundings, the surface is recognized as a straight line or curve with a width of less than 5 mm when visually observed at a distance of 40 cm from the substrate at a brightness of 1500 lux. Linear unevenness may be caused by, for example, a localized sharp or uneven change in glossiness in region B. In the display cover material 10, particularly in region B, the absence of linear unevenness on the first main surface 20A prevents the boundary between the printed portion 60 and the opening 70 from being recognized, thereby providing a display with excellent design.

[0090] The display cover material 10 is further preferably such that the standard deviation σ1 of the 60° glossiness of the A region measured at intervals of 10 mm on the line P is A , and the standard deviation σ1 of the 60° glossiness of the C region measured at 10 mm intervals on line P C The standard deviation σ1 of the 60° glossiness of the A region and the C region where the opening is provided is set. A ,σ1 C The standard deviation of the 60° glossiness of the A and C regions is σ1, which is less than 3 respectively, and can suppress the deviation of the 60° glossiness in the image display area and improve the uniformity of the image display.A ,σ1 C It should be noted that in this embodiment, it is assumed that the anti-glare layer on the line P of the region A and C and the anti-glare layer in the opening of the region A and C directly below are in substantially the same state. For example, a point Q on the line P A The glossiness at point Q A The point on the opening of the A region that advances in a direction parallel to the line LA is provided with a point Q. A In the case of the same printed layer on the back side, the glossiness is approximately the same.

[0091] The reason for using the value on line P is that by measuring in an area where a printed layer is formed on the first main surface 20A and the corresponding second main surface 20B, uniform measurement can be performed in a uniform state in which the reflective component on the second main surface side of the covering material is eliminated, thereby obtaining more accurate 60° gloss comparison information.

[0092] In addition, referring to the manufacturing method described later, it can also be considered that the 60° glossiness in the direction perpendicular to the direction of glossiness change (in this embodiment, the direction parallel to the line LA) is substantially the same.

[0093] The 60° glossiness of the display cover material 10 is designed to make the standard deviation σ1 of the 60° glossiness of the A region and the C region respectively A ,σ1 C 3 or less, and at the same time, point S on line P is 5 mm from line LA to area A. A The measured glossiness at 60° is set as G2 A , point S on line P 5 mm from line LC to area C C The measured glossiness at 60° is set as G2 C When formula (2) is satisfied, both uniformity of image display and natural glossiness variation can be achieved without causing discomfort. To satisfy this condition, when the width of region B is narrow, or when the rate of change in the 60° glossiness between regions A and C is large, the 60° glossiness value near line LA in region A is preferably varied toward the 60° glossiness value of region C, within a range that does not impair image uniformity. Conversely, the 60° glossiness value near line LC in region C is preferably varied toward the 60° glossiness value of region A.

[0094] More specifically, when the width of region B is 50 mm or less, or when the difference in 60° gloss between regions A and C is 15% or more, the average 60° gloss from line LA or line LC to a position 20 mm preferably changes by 2% or more compared to the average gloss from line LA or line LC to a position 100 mm. In other words, the gloss change rate near the boundary, as expressed by the following formula, is preferably 2% or more. Furthermore, when the width of the region is 30 mm or less, or when the difference in 60° gloss between regions A and C is 30% or more, the gloss change rate near the boundary is more preferably 5% or more.

[0095] [Glossiness change rate near the boundary] = (|G4 A ave 20 -G4 A ave 100 | / G4 A ave 100 +|G4 C ave 20 -G4 C ave 100 | / G4 C ave 100 ) / 2*100

[0096] Here, the average of the 60° glossiness measurement values ​​at each point on the line P from the line LA to the position 20 mm to the A region side is defined as G4. A ave 20 The average of the 60° glossiness measurement values ​​at each point on line P, which is 100 mm from line LA to area A, is defined as G4. A ave 100 The average of the 60° glossiness measurement values ​​at each point on line P from line LC to a position 20 mm to the C region side is defined as G4. C ave 20 The average of the 60° glossiness measurement values ​​at each point on line P, which is 100 mm from line LC to the C region side, is defined as G4. C ave 100 .

[0097] The display cover material 10 can be further formed with the above-mentioned G2 A and G2 C 、B W The values ​​of are formed so as to satisfy the following formula (3).

[0098] |G2 A -G2 C | / B W ≥0.08 ・・・(3)

[0099] Formula (2) determines the upper limit of the left side of Formula (3), and Formula (3) determines the lower limit. That is, Formula (3) represents the value obtained by adding the width of the B area (=B W ), the difference between the glossiness of the area B near the area A side and the glossiness of the area B near the area C side is greater than a certain value. Therefore, even if the width of the area B is not extremely large, the difference between the glossiness of the area A and the glossiness of the area C can be ensured.

[0100] In the graph with the position on the substrate as the horizontal axis and the 60° glossiness as the vertical axis, relative to the connection point S A 60° glossiness G2 A With point S C 60° glossiness G2 C The 60° gloss value G5 at the midpoint of the width of the straight line P in area B B The deviation rate from the value on the straight line at the same position on the substrate is preferably 5% or less. If the deviation rate is within the above range, a sharp change in glossiness is suppressed in region B, and the glossiness changes continuously from region A to region C. Therefore, the glossiness changes naturally without any sense of incongruity, thereby improving the design properties.

[0101] More specifically, the points Q on the line P in the B region are obtained at intervals of 10 mm. B The measured values ​​of 60° glossiness at the position are preferably such that the deviation rate of each measured value from the value on the straight line is 10% or less.

[0102] Here, the display cover material 10 is Figure 5 In the case of an S-shaped surface, region B may be curved. If region B is concavely curved, the radius of curvature may become smaller, making it difficult to measure the 60° glossiness. In such cases, the 60° glossiness can be measured only on the convex surface, which is easier to measure, and the deviation rate of the measured value may satisfy the above criteria.

[0103] The width W of line P, i.e., the width of region B, is set, for example, to 5 mm to 200 mm. By setting the width of region B to 5 mm or greater, linear unevenness can be suppressed. Furthermore, by setting the width of region B to 200 mm or less, degradation of design properties can be prevented.

[0104] The display cover material 10 is preferably Figure 2 The average values ​​of the 60° glossiness of the first opening 71 and the second opening 72 measured at intervals of 10 mm on the line P2 are respectively set as G3. A ave、G3 C When ave, satisfies|G3 A ave-G3 C ave|≥10. Line P2 is Figure 2The line LA shown is a vertical line passing through the center of the first opening 71 and the center of the second opening 72 .

[0105] The display cover material 10 is preferably Figure 2 The standard deviation σ2 of the 60° glossiness of the first opening 71 measured at 10 mm intervals on the line P2 shown is A and the standard deviation σ2 of the 60° glossiness of the second opening 72 measured at 10 mm intervals on line P2 C The standard deviation σ2 is more preferably A and σ2 C All below 3.

[0106] The display cover material 10 is preferably Figure 2 The average value Ra of the surface roughness of the first opening 71 measured at intervals of 10 mm on the line P2 shown is A ave and the average value Ra of the surface roughness of the second opening 72 measured at intervals of 10 mm on line P2 C ave Satisfaction|Ra A ave-Ra C ave|≥0.007μm. More preferably |Ra A ave-Ra C ave|≥0.015μm.

[0107] It should be noted that an anti-reflection (AR) layer and / or other decorative layers may also be provided on the first main surface 20A. The anti-reflection layer reduces reflectivity, reducing glare caused by reflected light and improving the visibility of the display device when used in a display device. The composition of the anti-reflection layer is not particularly limited as long as it can suppress light reflection. For example, it can be configured by alternating layers of high refractive index layers having a refractive index of 1.9 or greater at a wavelength of 550 nm and low refractive index layers having a refractive index of 1.6 or less at a wavelength of 550 nm. The anti-reflection layer is preferably provided above the anti-glare layer.

[0108] The antifouling layer inhibits the adhesion of various types of dirt, such as fingerprints, sweat, and dust, and also facilitates the removal of adhered dirt, keeping the display surface clean. The antifouling layer is provided on the first main surface 20A side. However, from the perspective of the properties of the antifouling layer, it is preferably formed on the outermost surface of the first main surface 20A side. The most preferred antifouling layer is a fluorine-containing compound (a compound having a fluorine-containing organic group) that imparts antifouling, hydrophobic, and oleophobic properties. The fluorine-containing compound is preferably a fluorine-containing organic compound, and more preferably a fluorine-containing organosilicon compound. In addition to fluorine compounds, compounds having long-chain alkyl groups and compounds having a polydimethylsiloxane structure may also be used.

[0109] <Method for manufacturing display cover material>

[0110] (Method of forming an anti-glare layer by coating)

[0111] In the display cover material 10 of this embodiment, the anti-glare film-forming liquid composition is applied to the substrate 20 by spray coating to form a coating film, and the coating film is sintered to form the anti-glare layer 30. This manufacturing method may, if necessary, include a step of forming a functional layer on the surface of the substrate 20 before forming the anti-glare layer 30. Furthermore, other post-processing steps may be performed after the anti-glare layer 30 is formed.

[0112] The anti-glare film-forming liquid composition is applied to the substrate 20 by spraying. This coating process is performed, for example, by using an electrostatic coating device to charge the anti-glare film-forming liquid composition and spraying it onto the substrate 20. This forms a coating film of the anti-glare film-forming liquid composition on the substrate 20. The electrostatic coating device includes a spray gun body and a rotary atomizing head. The rotary atomizing head is driven to rotate, and the anti-glare film-forming liquid composition supplied to the rotary atomizing head is atomized by centrifugal force and released for spraying onto the substrate 20.

[0113] Figure 6 This is a schematic diagram illustrating a method for manufacturing the display cover material 10 according to the present embodiment, particularly a method for forming the anti-glare layer 30 using an electrostatic coating device, and shows the formation process as viewed from above. Figure 6 The arrows shown indicate the conveyance direction of the substrate 20 . Figure 7 Observed from the side Figure 6 The figure of the formation process is a figure observed along the conveying direction of the substrate 20. The electrostatic coating spray guns 81 to 84 for spraying the material of the anti-glare layer 30 are set above the substrate 20. While using a conveyor or the like to move the substrate 20 along the conveying direction, the substrate 20 is moved along the conveying direction. Figure 6 Convey in the direction of the arrow, as Figure 7 As shown, the material of the anti-glare layer 30 is sprayed from the electrostatic coating spray guns 81 to 84 respectively to form the anti-glare layer 30 on the first main surface 20A of the substrate 20. Figure 6 The left side of the paper is area A, and the right side is area C. Figure 7 As shown, the spray ranges of the materials of the electrostatic coating spray guns 81 to 84 are overlapped.

[0114] During the production of the display cover material 10, adjustments are made to the composition of the anti-glare film-forming liquid composition, the operating conditions of each spray gun, such as the gun height, the gun discharge rate, and the shaping air conditions that deposit the droplets sprayed from the gun onto the substrate. This adjustment ensures that the glossiness of Area A and Area C on the first main surface 20A is uniform, and that the glossiness difference between Areas A and C in Area B flows smoothly, without any linear unevenness (dividing lines).

[0115] (Method of forming an anti-glare layer by etching)

[0116] In the above example, the anti-glare layer is formed by electrostatic coating, but the anti-glare layer can also be formed by etching. For example, the first main surface 20A of the substrate 20 can be surface treated by a chemical method or a physical method, and after forming a desired concave-convex shape of surface roughness, the surface shape can be adjusted by etching.

[0117] As a chemical method, a method of performing a frosting treatment (frost treatment) can be cited. Frosting treatment is performed, for example, by immersing the substrate 20 as the object to be treated in a mixed solution of hydrogen fluoride, ammonium fluoride, and glass powder. As a physical method, for example, it is performed by the following methods: so-called sandblasting treatment in which crystalline silica powder, silicon carbide powder, etc. are blown onto the surface of the substrate 20 with pressurized air, or a method in which a brush with crystalline silica powder, silicon carbide powder, etc. attached is wetted with water and the surface of the substrate 20 is polished with the brush. Among them, frosting treatment as a chemical surface treatment is less likely to cause microcracks on the surface of the object to be treated and less likely to cause a decrease in the strength of the substrate 20, and therefore is preferably used.

[0118] Furthermore, the first main surface 20A of the substrate 20 is preferably subjected to an etching treatment to correct its surface shape. For example, the etching treatment may involve immersing the substrate 20 in an etching solution, which is an aqueous solution of hydrogen fluoride, and performing chemical etching. The etching solution may contain, in addition to hydrogen fluoride, acids such as hydrochloric acid, nitric acid, and citric acid. The inclusion of these acids in the etching solution suppresses the reaction of cationic components such as Na ions and K ions in the substrate 20 with hydrogen fluoride, thereby suppressing the localized formation of precipitates. Furthermore, etching can be performed uniformly across the treated surface.

[0119] When etching is performed, the amount of etching can be adjusted by adjusting the concentration of the etching solution and the immersion time of the substrate 20 in the etching solution, thereby adjusting the haze value of the anti-glare treated surface of the substrate 20 to a desired value. Furthermore, while anti-glare treatment may result from physical surface treatments such as sandblasting, etching can blunt the tips of such cracks. Furthermore, etching can also achieve the effect of suppressing glare.

[0120] Furthermore, glossiness can be adjusted by etching. In particular, the frosted substrate 20 generally has very low glossiness, but etching can smooth the surface and thereby adjust the glossiness.

[0121] Since the glossiness depends on the etching amount, when the frosted substrate 20 is immersed in an etching solution and slowly pulled up, the etching amount of each area changes stepwise according to the pulling direction, thereby enabling the glossiness to change stepwise.

[0122] Hereinafter, the features of the display cover material according to the embodiment of the present invention will be summarized.

[0123] [1] The display cover material of the present invention comprises: a substrate having a first main surface and a second main surface, an anti-glare layer provided on the first main surface side, and a printed layer provided on the second main surface;

[0124] The first main surface has a printed portion and at least two openings, wherein the printed portion is a region on the corresponding second main surface where the printed layer is formed, and the at least two openings are regions on the corresponding second main surface where the printed layer is not formed.

[0125] The at least two openings include a first opening and a second opening adjacent to the first opening.

[0126] The printing portion includes a first printing portion located between the first opening and the second opening, and a second printing portion located along the outer periphery of the first main surface;

[0127] On the first main surface, a line extending from a boundary line between the first opening and the first printed portion is defined as line LA, and a line extending from a boundary line between the first printed portion and the second opening is defined as line LC.

[0128] On the first main surface, the area on the line LA near the first opening is defined as area A, the area between the line LA and the line LC is defined as area B, and the area on the line LC near the second opening is defined as area C.

[0129] On the second printed portion, the 60° glossiness was measured at intervals of 10 mm on a line P extending from the area A to the area C, passing through the middle of the outer periphery of the first main surface and the outer periphery of the opening. The average value in the area A was defined as G1. A ave, set the average value in the above C area to G1 C ave, then it satisfies

[0130] |G1A ave-G1 C ave|≥7,

[0131] The measured value of the 60° glossiness at a position 5 mm from the line LA to the A region on the line P is defined as G2. A The measured value of the 60° glossiness at a position 5 mm from the line LC to the C region on the line P is defined as G2. C , add 10mm to the width of the line P in the B area and set it as B W (mm), meet the

[0132] |G2 A -G2 C | / B W ≤0.4.

[0133] [2] The display cover material according to [1], wherein in the region B, no linear unevenness exists on the first main surface.

[0134] [3] The display cover material according to [1] or [2], wherein the standard deviation σ1 of the 60° glossiness of the area A measured at intervals of 10 mm on the line P is A ,as well as

[0135] The standard deviation σ1 of the 60° glossiness of the above-mentioned area C measured at intervals of 10 mm on the above-mentioned line P is C All below 3.

[0136] [4] The display cover material according to any one of [1] to [3] above, wherein the G2 A and G2 C 、B W satisfy

[0137] |G2 A -G2 C | / B W ≥0.08.

[0138] [5] The display cover material according to any one of [1] to [4] above, wherein each of the at least two openings has an area of ​​2500 mm 2 above.

[0139] [6] The display cover material according to any one of [1] to [5] above, wherein the first main surface has a curved portion.

[0140] [7] The display cover material according to any one of [1] to [6], wherein the heights of the region A and the region C of the first main surface are different when viewed in a cross section in the thickness direction of the display cover material.

[0141] [8] The display cover material according to any one of [1] to [7], further comprising an antireflection layer on the first main surface side.

[0142] [9] The display cover material according to any one of [1] to [8] above, wherein the long side of the display cover material is 380 mm to 1600 mm.

[0143]

[10] The display cover material according to any one of [1] to [9] above, wherein the width of the region B is 5 mm to 200 mm.

[0144]

[11] The display cover material according to any one of [1] to

[10] above, wherein the substrate is chemically strengthened glass.

[0145]

[12] The display cover material according to any one of [1] to

[11] above, wherein the anti-glare layer is a film mainly composed of silicon dioxide and formed on the first main surface to form a concavo-convex shape.

[0146]

[13] The display cover material according to any one of [1] to

[12] , wherein the average of the measured values ​​of the 60° glossiness at each point on the line P from the line LA to a position 20 mm to the side of the A region is set as G4. A ave 20 The average of the measured values ​​of the 60° glossiness at each point on the line P at a position 100 mm from the line LA to the A region side is defined as G4. A ave 100 The average of the measured values ​​of 60° glossiness at each point on the line P from the line LC to the position 20 mm to the side of the C region is set as G4. C ave 20 The average of the measured values ​​of the 60° glossiness at each point on the line P at a position 100 mm from the line LC to the C region side is set as G4. C ave 100 When satisfied

[0147] (|G4 A ave 20 -G4 A ave 100 | / G4 A ave 100 +|G4C ave 20 -G4 C ave 100 | / G4 C ave 100 ) / 2*100≥2.

[0148]

[14] The display cover material according to any one of [1] to

[13] , wherein, on a graph with the position on the substrate as the horizontal axis and the 60° glossiness as the vertical axis, the position of the display cover material is the same as the position of the display cover material connected to the G2 A and G2 above C The deviation rate of the 60° glossiness value at the midpoint of the width of the line P in the B region and the value on the straight line at the same position on the substrate is less than 5%.

[0149] It should be noted that the present invention is not limited to the above-described embodiments and can be appropriately modified and improved. In addition, the material, shape, size, value, method, number, configuration position, etc. of each component in the above-described embodiments can be arbitrary and not limited as long as the present invention can be achieved.

[0150] (Example)

[0151] Next, examples will be described. It should be noted that the embodiments may be modified as long as the effects of the invention are achieved. The following description details a method for forming an anti-glare layer using an electrostatic coating device.

[0152] Materials

[0153] 1. Particle dispersion

[0154] A 5wt% SUNLOVELY dispersion was used as the particle dispersion to create the precursor solution for the anti-glare layer. This dispersion consists of flaky silica particles dispersed by crushing SUNLOVELY LFS HN150 (manufactured by AGC Si-Tech). The concentration was 5wt%, and the dispersion solvent was water. The silica particles had an average particle size of 185nm and an average aspect ratio (average particle diameter / average thickness) of 80.

[0155] 2. Silica precursor solution containing particles

[0156] Silica precursor solutions containing particles, ie, the first to third coating solutions, were prepared according to the following steps.

[0157] (1) Liquid 1 coating liquid

[0158] Solmix AP-11 (trade name of Japan Alcohol Trading Co., Ltd., industrial ethanol) was used as the main solvent. First, the stock solution for the Liquid 1 coating solution, Liquid 1 stock solution, was prepared according to the following procedure. While stirring the AP-11 with a magnetic stirrer, tetraethoxysilane, KBM3066 (manufactured by Shin-Etsu Silicone Co., Ltd.), pure water, the aforementioned 5 wt% SUNLOVELY dispersion, and 60 wt% nitric acid were added at 11.44 wt%, 1.36 wt%, 3.8 wt%, 4.0 wt%, and 0.12 wt% of the total mass of the Liquid 1 stock solution, respectively. The mixture was mixed at 60°C for 60 minutes to obtain the Liquid 1 stock solution (silane compound SiO2 conversion concentration of 4.0 wt%).

[0159] Next, while stirring AP-11 with a magnetic stirrer, the above-mentioned Liquid 1 stock solution and propylene glycol were added so that the amounts thereof were 12.5 wt % and 0.14 wt %, respectively, relative to the total mass of the Liquid 1 coating solution. The mixture was mixed at 25°C for 15 minutes to obtain a Liquid 1 coating solution (silane compound SiO2 conversion concentration of 0.5 wt %).

[0160] (2) Liquid 2 coating liquid

[0161] Solmix AP-11 (trade name of Japan Alcohol Trading Co., Ltd., industrial ethanol) was used as the main solvent. First, the stock solution for the Liquid 2 coating solution, Liquid 2 stock solution, was prepared according to the following procedure. While stirring the AP-11 with a magnetic stirrer, tetraethoxysilane, KBM3066 (manufactured by Shin-Etsu Silicone Co., Ltd.), pure water, the aforementioned 5 wt% SUNLOVELY dispersion, and 20 wt% nitric acid were added at 9.54 wt%, 0.54 wt%, 12.9 wt%, 3.11 wt%, and 0.27 wt% relative to the total mass of the Liquid 2 stock solution, respectively. The mixture was mixed at 60°C for 60 minutes to obtain the Liquid 2 stock solution (silane compound SiO2 conversion concentration of 3.1 wt%).

[0162] Next, while stirring AP-11 with a magnetic stirrer, the above-mentioned Liquid 2 stock solution was added so as to make 9.66 wt % relative to the total mass of the Liquid 2 coating solution, and mixed at 25° C. for 15 minutes to obtain a Liquid 2 coating solution (silane compound SiO 2 conversion concentration 0.3 wt %).

[0163] (3) Liquid 3 coating liquid

[0164] Solmix AP-11 (trade name of Japan Alcohol Trading Co., Ltd., industrial ethanol) was used as the main solvent. First, the stock solution for the Liquid 3 coating solution, Liquid 3 stock solution, was prepared according to the following procedure. While stirring the AP-11 with a magnetic stirrer, tetraethoxysilane, KBM3066 (manufactured by Shin-Etsu Silicone Co., Ltd.), pure water, the aforementioned 5 wt% dispersion of SUNLOVELY, and 60 wt% nitric acid were added at a rate of 11.03 wt%, 1.36 wt%, 1.52 wt%, 6.4 wt%, and 0.12 wt% relative to the total mass of the Liquid 3 stock solution, respectively. The mixture was mixed at 60°C for 60 minutes to obtain the Liquid 3 stock solution (silane compound SiO2 conversion concentration of 4.0 wt%).

[0165] Next, while stirring AP-11 with a magnetic stirrer, the above-mentioned Liquid 3 stock solution and propylene glycol were added so that the amounts thereof were 12.5 wt % and 0.1 wt %, respectively, relative to the total mass of the Liquid 3 coating solution. The mixture was mixed at 25° C. for 15 minutes to obtain a Liquid 3 coating solution (silane compound SiO 2 conversion concentration of 0.5 wt %).

[0166] <Electrostatic coating equipment>

[0167] An electrostatic coating apparatus (liquid electrostatic coater, manufactured by Asahi Sunac) equipped with an electrostatic coating spray gun was prepared. A rotary atomizing automatic electrostatic spray gun (Sunbell, ESA120, manufactured by Asahi Sunac, with an atomizer cup diameter of 70 mm) was used as the electrostatic coating spray gun. A stainless steel base was used to support the substrate in order to dissipate the charge.

[0168] <Electrostatic coating>

[0169] The temperature within the electrostatic coating chamber was adjusted to 23 ± 1°C, and the humidity to 52% ± 3%. The substrate, placed on a base, was conveyed by a conveyor and passed beneath an electrostatic coating gun spraying a silica precursor solution containing particles (Liquid 1 to Liquid 3). In this study, the coating was performed once.

[0170] The cleaned substrate is placed on a stainless steel base on the chain conveyor of the electrostatic coating device with its long side perpendicular to the conveying direction. While being conveyed at a constant speed by the chain conveyor, a coating liquid at a temperature within the range of 25±1°C is applied to the B surface of the substrate (i.e., the surface that comes into contact with the molten tin during the float process) by electrostatic coating. The substrate is then sintered in the atmosphere at 300°C for 60 minutes to form an anti-glare layer. The coating conditions are an atomizer cup speed of 35krpm and a voltage of 60kV. The atomizer cup speed represents the rotation speed of the rotary atomizing head. The voltage represents the voltage applied to the electrostatic coating spray gun. The spray gun height, described below, represents the distance from the lower end of the bell cup of the electrostatic coating spray gun to the substrate. The lower end of the bell cup is the front end of the rotary atomizing head in the spray direction of the coating composition.

[0171] In addition, as another method, coating may be performed by leaving the substrate stationary and moving the spray gun on the substrate by a robot.

[0172] <Example 1~Example 9>

[0173] Nine display cover materials were produced. Examples 1 to 7 and 9 are examples, and Example 8 is a comparative example. Example 1 used a 400 mm x 150 mm flat rectangular glass plate as the substrate. After forming the anti-glare layer, black printing (20 mm width on the outer perimeter and 30 mm width in area B) was applied to the back surface via screen printing to form a printed layer. The settings for spray gun 1 (electrostatic coating spray gun) used to form area A were: Liquid 1 (Liquid Type; Liquid 1 Coating Liquid), liquid volume 29 ml / min, position 160 mm, spray gun height 285 mm, and shaping air 140 L / min. The settings for spray gun 2 used to form area C were: Liquid 1 (Liquid Type; Liquid 1 Coating Liquid), liquid volume 20 ml / min, position -240 mm, spray gun height 285 mm, and shaping air 140 L / min. Position refers to the position of spray guns 1 and 2 on a horizontal plane, with the center of the long side of the glass plate set to 0. Positive values ​​are used for area A, and negative values ​​are used for area C. Shaping air is the gas that blows droplets sprayed from the spray gun toward the substrate. A smaller value indicates greater droplet spread, while a larger value indicates less droplet spread. Coating was performed at a conveyor speed of 38 mm / sec. Gloss was measured at 60° using a Konica Minolta GM-268A gloss meter.

[0174] Examples 2 to 9 used the glass plates shown in Table 1 as substrates. Examples 6 and 7 used flat rectangular glass plates of the dimensions shown in Table 1, which were bent in the middle of their long sides to form an S-shaped curved portion when observed in cross section. Table 2 shows the setting values ​​of the spray guns used to form the anti-glare layer. Spray guns 1, 2, 3, and 4 correspond to Figure 6Electrostatic coating spray guns 81, 82, 83, and 84 are shown. Examples 2 through 9 were produced according to the number of spray guns, liquid type, liquid volume, position, height, and shaping air shown in Table 2. Examples 3 and 8 used Liquid 3 (liquid type; Liquid 3 coating liquid). The conveying speed for Examples 2 through 9 was 38 mm / sec. In Examples 4 through 7, in addition to spray guns 1 and 2, spray gun 3 was used to form area A and spray gun 4 was used to form area C. Table 1 shows all the numerical values ​​for Examples 1 through 9.

[0175]

[0176]

[0177] In the display cover material of Example 1 produced as described above, the distance from the left end of the substrate to the center of region B is 200 mm, and the width is 30 mm. | G1 A ave-G1 C ave|is 7.0%.|G2 A -G2 C | / B W The display cover materials of Examples 2 to 9 are shown in Tables 1 and 2 respectively.

[0178] Examples 1 to 7, and Example 9 satisfy the requirements of equations (1) and (2). Since the glossiness changes naturally from area A to area C, a product with good design can be obtained. Example 8 does not satisfy equation (2), and the glossiness change from area A to area C is recognized as a boundary, and a product with good design cannot be obtained.

[0179] σ in Examples 1 to 8 1A , σ 1C The uniformity of the display area is ensured by being 3 or less. In particular, in Examples 1, 3 to 7, σ indicating the uniformity of the display area is 1A , σ 1C 2 or less, the uniformity of the display area is high. In addition, |G1 of Examples 2, 3, 5, 7, and 9 is A ave-G1 C An ave| value of 15 or greater ensures a large difference between areas A and C while ensuring a natural change in glossiness from area A to area C. In particular, in Examples 3, 5, and 7, uniformity in the display area can also be achieved.

[0180] In addition, although the width of the region B is relatively narrow in Examples 1, 2, and 9, a natural change in glossiness from region A to region C can be ensured. In particular, in Example 1, uniformity in the display region can also be achieved.

[0181] Figures 8 to 11This is a graph showing changes in 60° glossiness in the longitudinal direction of the display cover material, that is, in each of the A region, the B region, and the C region. Figure 8 The changes in glossiness in Examples 1, 2, 8, and 9 are shown, in which the long side of the substrate is 400 mm and the width of the B region is 30 mm. Figure 9 The change in glossiness in Example 3 is shown, in which the long side of the substrate is 400 mm and the width of the B region is 50 mm. Figure 10 The change in glossiness in Examples 4 and 5 is shown, in which the long side of the substrate is 1000 mm and the width of the B region is 50 mm. Figure 11 The glossiness changes in Examples 6 and 7 are shown, where the long side of the substrate is 1000 mm and the width of the B region is 70 mm. Figures 8 to 11 As shown, the glossiness value varies with each region, and when the display cover material is set on the display, different characteristics can be given to each region.

[0182] While various embodiments have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that those skilled in the art will be able to conceive of various variations or modifications within the scope of the claimed scope of the patent application, and these naturally fall within the technical scope of the present invention. Furthermore, the various components of the above-described embodiments may be arbitrarily combined without departing from the spirit of the invention.

[0183] It should be noted that the present application is based on Japanese patent application (Japanese Patent Application No. 2023-047239) filed on March 23, 2023, the contents of which are incorporated herein by reference.

[0184] Explanation of symbols

[0185] 1 steering shaft

[0186] 2 In-vehicle display devices

[0187] 3 Vehicle navigation screen

[0188] 4 Speedometer

[0189] 5 Start button

[0190] 10 Display cover material

[0191] 20 substrate

[0192] 20A 1st Main Side

[0193] 20B Second main surface

[0194] 30 Anti-glare layer

[0195] 40 printing layers

[0196] 60 Printing Department

[0197] 61 No. 1 Printing Department

[0198] 62 Second Printing Department

[0199] 70 opening

[0200] 71 First opening

[0201] 72 Second opening

Claims

1. A display cover material comprising: A substrate having a first main surface and a second main surface, an anti-glare layer provided on the first main surface side, a printing layer, disposed on the second main surface; The first main surface has a printing portion and at least two openings, the printing portion is a region on the corresponding second main surface where the printing layer is formed, and the at least two openings are regions on the corresponding second main surface where the printing layer is not formed. The at least two openings include a first opening and a second opening adjacent to the first opening. The printing portion includes a first printing portion located between the first opening and the second opening, and a second printing portion located along an outer periphery of the first main surface; On the first main surface, a line obtained by extending a boundary line between the first opening and the first printed portion is defined as line LA, and a line obtained by extending a boundary line between the first printed portion and the second opening is defined as line LC. On the first main surface, the area from the line LA to the first opening is defined as area A, the area between the line LA and the line LC is defined as area B, and the area from the line LC to the second opening is defined as area C. On the second printed portion, the 60° glossiness was measured at intervals of 10 mm on a line P passing through the middle of the outer periphery of the first main surface and the outer periphery of the opening and extending from the area A to the area C. The average value in the area A was defined as G1. A ave, set the average value in the C area to G1 C ave, then it satisfies |G1 A ave-G1 C ave|≥7, The measured value of the 60° glossiness at a position 5 mm from the line LA to the A region on the line P is defined as G2. A The measured value of the 60° glossiness at a position 5 mm from the line LC to the C region on the line P is set as G2 C , add 10mm to the width of the line P in the B area and set it as B W When satisfied |G2 A -G2 C | / B W ≤0.4, B W The unit is mm.

2. The display cover material according to claim 1, wherein In the B region, there is no linear unevenness on the first main surface.

3. The display cover material according to claim 1 or 2, wherein: The standard deviation σ1 of the 60° gloss of the A area measured at 10 mm intervals on the line P is A ,as well as The standard deviation σ1 of the 60° gloss of the C region measured at 10 mm intervals on the line P is C All below 3.

4. The display cover material according to claim 1 or 2, wherein: The G2 A and G2 C 、B W satisfy |G2 A -G2 C | / B W ≥0.08。 5. The display cover material according to claim 1 or 2, wherein: The area of ​​each of the at least two openings is 2500 mm 2 above.

6. The display cover material according to claim 1 or 2, wherein: The first main surface has a curved portion.

7. The display cover material according to claim 6, wherein: When the display cover material is observed in a cross section in the thickness direction, the A region and the C region of the first main surface have different heights.

8. The display cover material according to claim 1 or 2, wherein: An antireflection layer is provided on the first main surface side.

9. The display cover material according to claim 1 or 2, wherein: The long side of the display covering material is 380 mm to 1600 mm.

10. The display cover material according to claim 1 or 2, wherein: The width of the B region is 5 mm to 200 mm.

11. The display cover material according to claim 1 or 2, wherein: The substrate is chemically strengthened glass.

12. The display cover material according to claim 1 or 2, wherein: The anti-glare layer is a film mainly composed of silicon dioxide and formed on the first main surface to form a concavo-convex shape.

13. The display cover material according to claim 1 or 2, wherein: The average of the measured values ​​of 60° glossiness at each point on the line P from the line LA to a position 20 mm to the A region side is defined as G4. A ave 20 The average of the measured values ​​of the 60° glossiness at each point on the line P at a position 100 mm from the line LA to the A region side is set as G4. A ave 100 The average of the measured values ​​of 60° glossiness at each point on the line P from the line LC to the position 20 mm to the C region side is set as G4. C ave 20 The average of the measured values ​​of the 60° glossiness at each point on the line P at a position 100 mm from the line LC to the C region side is set as G4. C ave 100 When satisfied (|G4 A ave 20 -G4 A ave 100 | / G4 A ave 100 +|G4 C ave 20 -G4 C ave 100 | / G4 C ave 100 ) / 2*100≥2。 14. The display cover material according to claim 1 or 2, wherein: In the graph with the position on the substrate as the horizontal axis and the 60° glossiness as the vertical axis, relative to the connection of G2 A With the G2 C The straight line has a deviation rate of 5% or less between the 60° glossiness value at the midpoint of the width of the line P in the B region and the value on the straight line at the same position on the substrate.

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