Display device components, display devices and electronic devices

Abstract

To provide a display device member excellent in flex resistance and impact resistance, and improved in safety.SOLUTION: A display device member 1 having a glass substrate 2, a resin layer 3, and a functional layer 4 in this order is such that: a thickness of the glass substrate is 100 μm or less; an average value of the total thicknesses of the resin layer and the functional layer is 19 μm or more and 60 μm or less; a maximum value of the total thicknesses of the resin layer and the functional layer is 60 μm or less; a composite elastic modulus of the resin layer is 4.7 GPa or more and 20 GPa or less; the functional layer is a hard coat layer; a ratio of the maximum value of the total thicknesses of the resin layer and the functional layer to the average value of the total thicknesses of the resin layer and the functional layer is 132% or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a member for a display device, a display device, and an electronic device. [Background technology]

[0002] Conventionally, display devices have used glass or resin cover members to protect the display device. These cover members protect the display device from impacts and scratches, and are required to have strength, impact resistance, scratch resistance, and the like. Glass cover members are characterized by high surface hardness, scratch resistance, and high transparency, while resin cover members are characterized by light weight and shatter resistance. In addition, the thicker the cover member, the better its ability to protect the display device from impacts, and the material and thickness of the cover member are appropriately selected based on the weight, cost, size of the display device, and the like.

[0003] BACKGROUND ART In recent years, flexible displays such as foldable displays, rollable displays, and bendable displays have been actively developed, and among these, development of foldable displays, i.e., display devices that can be bent, has been progressing.

[0004] In bendable display devices, the cover member must also bend in accordance with the movement of the display device, and therefore a bendable cover member is used. In the case of resin cover members, polyimide or polyamide-imide films that have been made colorless and transparent through ingenuity in their chemical structure have been developed (see, for example, Patent Document 1). In the case of glass cover members, studies are underway to develop bendable cover members by thinning the glass, such as ultra-thin glass (UTG) (see, for example, Patent Document 2). Among glass types, chemically strengthened glass has particularly high bending resistance. By incorporating expansion stress into the glass surface, minute scratches on the glass surface do not become larger when bent, making the glass less likely to break.

[0005] Glass has a higher elastic modulus than resin, so it has a better ability to protect a display device than resin at the same thickness. Glass also has high optical transparency, making it possible to manufacture display devices with better visibility. However, as glass becomes thinner, it becomes more fragile, dramatically reducing its impact resistance. If the glass cover member breaks due to an external impact, not only does it reduce its ability to protect the display device, but the resulting fragments and sharp edges may injure the user's fingertips, etc.

[0006] Therefore, it has been proposed to laminate a resin layer on a glass substrate. For example, Patent Document 3 discloses a laminate of glass and a cured resin layer. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2019-137864 [Patent Document 2] Japanese Patent Application Publication No. 2018-188335 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-280092 Summary of the Invention [Problem to be solved by the invention]

[0008] In a display device including a laminate having a glass substrate and a resin layer, by arranging the resin layer closer to the viewer than the glass substrate, the resin layer can suppress glass cracking due to impact and improve impact resistance. However, if the thickness of the resin layer is increased to improve impact resistance, bending resistance decreases. On the other hand, if the thickness of the resin layer is reduced from the viewpoint of bending resistance, sufficient impact resistance cannot be obtained. Therefore, there is a demand for display device components that can achieve both bending resistance and impact resistance.

[0009] The present disclosure has been made in view of the above circumstances, and has as its main object to provide a member for a display device that has good flex resistance and impact resistance and also has improved safety. [Means for solving the problem]

[0010] In order to solve the above problems, the inventors of the present disclosure conducted extensive research and found that in a display device component in which a resin layer and a functional layer are arranged in this order on one surface of a thin glass substrate, good bending resistance and impact resistance can both be achieved by controlling the film thickness distribution of the resin layer and the functional layer and setting the average and maximum total thicknesses of the resin layer and the functional layer within a predetermined range. Furthermore, in a display device component in which a resin layer is arranged on one surface of a thin glass substrate, good bending resistance and impact resistance can both be achieved by controlling the film thickness distribution of the resin layer and setting the average and maximum thicknesses of the resin layer within a predetermined range. The present disclosure is based on these findings.

[0011] One embodiment of the present disclosure provides a display device component having a glass substrate, a resin layer, and a functional layer in this order, wherein the thickness of the glass substrate is 100 μm or less, the average total thickness of the resin layer and the functional layer is 19 μm or more and 60 μm or less, and the maximum total thickness of the resin layer and the functional layer is 60 μm or less.

[0012] In the member for a display device according to this embodiment, the functional layer is preferably a hard coat layer.

[0013] In the member for a display device according to this embodiment, the average thickness of the functional layer is preferably 5 μm or more and less than 15 μm.

[0014] In the display device member of this embodiment, the ratio of the maximum total thickness of the resin layer and the functional layer to the average total thickness of the resin layer and the functional layer is preferably 132% or less.

[0015] In the display device member of this embodiment, when the resin layer and the functional layer have raised portions at their ends, and the cross-sectional shape of the raised portions is approximated to a triangle, the height of the triangle is the difference between the maximum value of the total thickness of the resin layer and the functional layer and the average value of the total thickness of the resin layer and the functional layer, and the length of the base of the triangle is the distance from the end of the resin layer and the functional layer to a position where the total thickness of the raised portions of the resin layer and the functional layer becomes the average value of the total thickness of the resin layer and the functional layer, the area of ​​the triangle is 0.08 mm 2 It is preferable that:

[0016] In the above case, the ratio of the average thickness of the functional layer to the average total thickness of the resin layer and the functional layer is preferably 10% or more and 65% or less.

[0017] Another embodiment of the present disclosure provides a display device component having a glass substrate, a resin layer, a first functional layer, and a functional film in this order, the functional film having, from the first functional layer side, an adhesive layer, a base layer, and a second functional layer, wherein the thickness of the glass substrate is 100 μm or less, the average total thickness of the resin layer and the first functional layer is 10 μm or more and 60 μm or less, and the maximum total thickness of the resin layer and the first functional layer is 60 μm or less.

[0018] In the member for a display device of this embodiment, the first functional layer and the second functional layer are preferably hard coat layers.

[0019] In the member for a display device according to this embodiment, the average thickness of the functional film is preferably 20 μm or more and 150 μm or less.

[0020] In the display device member of this embodiment, it is preferable that the average thickness of the first functional layer is 5 μm or more and less than 15 μm, and the average thickness of the second functional layer is 5 μm or more and less than 15 μm.

[0021] In the display device member of this embodiment, it is preferable that the ratio of the maximum value of the total thickness of the resin layer and the first functional layer to the average value of the total thickness of the resin layer and the first functional layer is 132% or less.

[0022] In the display device member of this embodiment, when the resin layer and the first functional layer have raised portions at their ends, and the cross-sectional shape of the raised portions is approximated to a triangle, the height of the triangle is defined as the difference between the maximum value of the total thickness of the resin layer and the first functional layer and the average value of the total thickness of the resin layer and the first functional layer, and the length of the base of the triangle is defined as the distance from the end of the resin layer and the first functional layer to a position where the total thickness of the raised portions of the resin layer and the first functional layer becomes the average value of the total thickness of the resin layer and the first functional layer, the area of ​​the triangle is 0.08 mm 2 It is preferable that:

[0023] In the above case, it is preferable that the ratio of the average thickness of the first functional layer to the average total thickness of the resin layer and the first functional layer is 10% or more and 65% or less.

[0024] Another embodiment of the present disclosure provides a display device component having a glass substrate, a resin layer, and a functional film in this order, and the functional film has, from the resin layer side, an adhesive layer, a base layer, and a functional layer in this order, wherein the thickness of the glass substrate is 100 μm or less, the average thickness of the resin layer is 10 μm or more and 60 μm or less, and the maximum thickness of the resin layer is 60 μm or less.

[0025] In the member for a display device according to this embodiment, the functional layer is preferably a hard coat layer.

[0026] In the member for a display device according to this embodiment, the average thickness of the functional film is preferably 20 μm or more and 150 μm or less.

[0027] In the member for a display device according to this embodiment, the average thickness of the functional layer is preferably 5 μm or more and less than 15 μm.

[0028] In the member for a display device according to the present embodiment, the ratio of the maximum thickness of the resin layer to the average thickness of the resin layer is preferably 130% or less.

[0029] In the display device member of this embodiment, the resin layer has a raised portion at an end portion, and when the cross-sectional shape of the raised portion is approximated to a triangle, the height of the triangle is the difference between the maximum thickness of the resin layer and the average thickness of the resin layer, and the length of the base of the triangle is the distance from the end of the resin layer to a position where the total thickness of the raised portion of the resin layer becomes the average thickness of the resin layer, the area of ​​the triangle is 0.08 mm 2 It is preferable that:

[0030] Another embodiment of the present disclosure provides a display device including a display panel and the above-described member for a display device disposed on a viewer side of the display panel.

[0031] Another embodiment of the present disclosure provides an electronic device including the above-described display device. [Effects of the Invention]

[0032] The present disclosure has an effect of providing a member for a display device that has good flex resistance and impact resistance and also has improved safety. [Brief explanation of the drawings]

[0033] [Figure 1] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 2] 1 is a schematic perspective view illustrating a member for a display device according to the present disclosure. [Figure 3] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 4]1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 5] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 6] FIG. 1 is a schematic diagram for explaining a dynamic bending test. [Figure 7] FIG. 1 is a schematic diagram for explaining a static bending test. [Figure 8] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 9] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 10] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 11] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 12] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 13] 1 is a schematic cross-sectional view illustrating a member for a display device according to the present disclosure. [Figure 14] 1 is a schematic cross-sectional view illustrating a display device according to the present disclosure. [Figure 15] 1 is a graph showing the distribution of the total thickness of the resin layer and the hard coat layer in members for a display device of Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0034] Embodiments of the present disclosure will be described below with reference to the drawings and the like. However, the present disclosure can be implemented in many different forms, and should not be construed as being limited to the description of the embodiments exemplified below. Furthermore, to clarify the explanation, the drawings may show the width, thickness, shape, etc. of each part schematically compared to the actual form, but these are merely examples and are not intended to limit the interpretation of the present disclosure. Furthermore, in this specification and each drawing, elements similar to those described above with reference to the previous drawings will be designated by the same reference numerals, and detailed descriptions may be omitted as appropriate.

[0035] In this specification, when describing a mode in which another component is placed on a certain component, the terms "above" or "below" are used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween. Also, in this specification, when describing a mode in which another component is placed on the surface of a certain component, the terms "on the surface side" or "on the surface" are used, unless otherwise specified, to include both a case in which another component is placed directly above or below a certain component so as to be in contact with the component, and a case in which another component is placed above or below a certain component with another component interposed therebetween.

[0036] Hereinafter, the member for a display device and the display device according to the present disclosure will be described in detail.

[0037] A. Display device components The member for a display device according to the present disclosure has three embodiments, each of which will be described below.

[0038] I. First embodiment A first embodiment of a display device member of the present disclosure is a display device member having a glass substrate, a resin layer, and a functional layer in this order, wherein the thickness of the glass substrate is 100 μm or less, the average total thickness of the resin layer and the functional layer is 19 μm or more and 60 μm or less, and the maximum total thickness of the resin layer and the functional layer is 60 μm or less.

[0039] 1 is a schematic cross-sectional view showing an example of a member for a display device according to this embodiment. As shown in FIG. 1, the member for a display device 1 includes a glass substrate 2, a resin layer 3, and a functional layer 4 in this order. The glass substrate 2 has a predetermined thickness. The average value of the total thickness of the resin layer 3 and the functional layer 4 is within a predetermined range, and the maximum value T1 of the total thickness of the resin layer 3 and the functional layer 4 is within a predetermined range. max is equal to or less than a predetermined value.

[0040] When the resin layer 3 and the functional layer 4 are formed on one surface of the glass substrate 2 by a coating method, the thickness of the end portions of the resin layer 3 and the functional layer 4 increases due to surface tension, and protruding portions 11 tend to form at the end portions of the resin layer 3 and the functional layer 4. In the example shown in FIG. 1 , the maximum value of the total thickness of the protruding portions 11 of the resin layer 3 and the functional layer 4 is the maximum value T1 of the total thickness of the resin layer 3 and the functional layer 4. max This becomes:

[0041] In the display device component of this embodiment, the glass substrate has a thickness of less than a predetermined value, which is thin, and there is concern that it may be easily broken and have low impact resistance. However, since a resin layer and a functional layer are arranged in this order on one side of the glass substrate, and the average value of the total thickness of the resin layer and the functional layer is greater than or equal to a predetermined value, when an impact is applied to the display device component, the resin layer absorbs the impact and can suppress breakage of the glass substrate, thereby improving impact resistance.

[0042] Here, as described above, when a resin layer and a functional layer are formed on one surface of a glass substrate by a coating method, the thickness of the end portions of the resin layer and the functional layer increases due to surface tension, and as shown in Fig. 1, for example, raised portions 11 tend to occur at the end portions of the resin layer 3 and the functional layer 4. If raised portions exist at the end portions of the resin layer and the functional layer, cracks, whitening, wrinkles, etc. are likely to occur in the resin layer and the functional layer starting from the raised portions when the display device member is bent.

[0043] In contrast, in the display device component of this embodiment, the average value of the total thickness of the resin layer and the functional layer is within a predetermined range, and the maximum value of the total thickness of the resin layer and the functional layer is below a predetermined value, thereby suppressing the occurrence of cracks, whitening, wrinkles, etc. in the resin layer and the functional layer when the display device component is bent, and improving bending resistance.

[0044] Therefore, the member for a display device in this embodiment can achieve both good bending resistance and good impact resistance.

[0045] Furthermore, in the display device component in this embodiment, a resin layer and a functional layer are arranged in this order on one side of the glass substrate, which makes it possible to increase the hardness of the surface on the functional layer side of the display device component and improve scratch resistance.

[0046] Furthermore, in the display device member of this embodiment, the resin layer and the functional layer are arranged in this order on one surface of the glass substrate, so that even if the glass substrate is broken, the glass can be prevented from scattering, thereby reducing the risk of injury to the human body and providing a display device member with high safety.

[0047] Therefore, the display device member in this embodiment can be bent and used in a wide variety of display devices, and can be used, for example, as a foldable display member.

[0048] Hereinafter, each configuration of the member for a display device in this embodiment will be described.

[0049] 1. Thickness of the resin layer and functional layer In this embodiment, the average total thickness of the resin layer and the functional layer can be 19 μm or more and 60 μm or less, preferably 25 μm or more and 55 μm or less, and more preferably 30 μm or more and 50 μm or less. By having the average total thickness of the resin layer and the functional layer within the above range, cracking of the glass substrate due to impact can be suppressed, improving impact resistance. Furthermore, when the display device component is bent, cracks, whitening, wrinkles, etc., can be suppressed in the resin layer and the functional layer, improving flex resistance. On the other hand, if the average total thickness of the resin layer and the functional layer is too small, impact resistance may be reduced. Furthermore, if the average total thickness of the resin layer and the functional layer is too large, flex resistance may be reduced.

[0050] In this embodiment, the maximum total thickness of the resin layer and the functional layer is 60 μm or less, and preferably 55 μm or less. By ensuring that the maximum total thickness of the resin layer and the functional layer is within the above range, cracks, whitening, wrinkles, etc., can be suppressed from occurring in the resin layer or the functional layer when the display device member is bent, thereby improving bending resistance. In particular, when the functional layer is a hard coat layer, cracks, whitening, wrinkles, etc., can be suppressed from occurring in the hard coat layer when the display device member is bent. On the other hand, if the maximum total thickness of the resin layer and the functional layer is too large, bending resistance may be reduced.

[0051] As described above, when a resin layer and a functional layer are formed on one surface of a glass substrate by a coating method, surface tension tends to increase the thickness of the edges of the resin layer and the functional layer, resulting in raised portions 11 at the edges of the resin layer 3 and the functional layer 4, as shown in FIG. 1 . In this case, the maximum total thickness of the resin layer and the functional layer is the maximum total thickness of the raised portions of the resin layer and the functional layer. In such a case, for example, if the resin layer and the functional layer have a rectangular or square shape in plan view, it is sufficient that the maximum total thickness of the resin layer and the functional layer at the edge of at least one of the four sides of the resin layer and the functional layer falls within the above range.

[0052] In particular, it is preferable that the maximum total thickness of the resin layer and the functional layer be within the above range at the ends of two opposing sides of the resin layer and the functional layer. For example, as shown in Figures 2(a) and 2(b), when the display device member 1 is bent, cracks, whitening, wrinkles, etc. are likely to occur in the resin layer and the functional layer at the bent portion 13 of the display device member 1. Therefore, if the maximum total thickness of the resin layer and the functional layer is within the above range at the ends of two sides of the resin layer and the functional layer that are approximately parallel to the bending direction 12 of the display device member 1, cracks, whitening, wrinkles, etc. can be suppressed at the bent portions of the resin layer and the functional layer when the display device member is bent, and bending resistance can be improved.

[0053] Furthermore, when the resin layer and the functional layer have a rectangular shape in plan view, it is preferable that the maximum total thickness of the resin layer and the functional layer at the ends of two opposing long sides of the resin layer and the functional layer be within the above range. For example, as shown in Figures 2(a) and 2(b), when bending a display device member 1, the bending direction 12 of the display device member 1 is often made approximately parallel to the long side direction of the resin layer and the functional layer, because bending is easy. Therefore, if the maximum total thickness of the resin layer and the functional layer at the ends of two opposing long sides of the resin layer and the functional layer is within the above range, the occurrence of cracks, whitening, wrinkles, etc. in the bent portions of the resin layer and the functional layer when the display device member is bent can be suppressed, and bending resistance can be improved.

[0054] Furthermore, for the reasons mentioned above, it is preferable that the maximum total thickness of the resin layer and the functional layer is within the above range at the ends of two of the four sides of the resin layer and the functional layer that are approximately parallel to the bending direction of the display device component.

[0055] In particular, it is preferable that the maximum total thickness of the resin layer and the functional layer is within the above range at all four edge portions of the resin layer and the functional layer, thereby further improving the flex resistance.

[0056] Examples of methods for controlling the maximum value of the total thickness of the resin layer and the functional layer to be within a predetermined range include a method in which a leveling agent is incorporated into the resin layer and the functional layer, a method in which a resin layer and a functional layer are formed on one side of a glass substrate to obtain a laminate, and then the laminate is cut, and a method in which the resin layer and the functional layer are transferred to one side of a glass substrate.

[0057] In this embodiment, the ratio of the maximum total thickness of the resin layer and the functional layer to the average total thickness of the resin layer and the functional layer is, for example, preferably 132% or less, and may be 125% or less. By having the ratio within the above range, cracks, whitening, wrinkles, etc., can be suppressed from occurring in the resin layer or the functional layer when the display device member is bent, thereby improving bending resistance. In particular, when the functional layer is a hard coat layer, cracks, whitening, wrinkles, etc., can be suppressed from occurring in the hard coat layer when the display device member is bent. On the other hand, if the ratio is too large, bending resistance may be reduced.

[0058] Here, the total thickness of the resin layer and the functional layer can be measured by microscopic cross-sectional observation or a stylus method. Microscopic cross-sectional observation involves, for example, using a transmission electron microscope (TEM), a scanning electron microscope (SEM), or a scanning transmission electron microscope (STEM) to observe the cross section of the display device member in the thickness direction, and the total thickness of the resin layer and the functional layer can be determined from the resulting image. Furthermore, the stylus method involves, for example, using a stylus film thickness meter to measure the film thickness by tracing the surface of the display device member with a stylus, and the total thickness of the resin layer and the functional layer can be determined from the resulting film thickness profile data.

[0059] When the resin layer 3 and the functional layer 4 have raised portions 11, as shown in Fig. 1, the average total thickness of the resin layer and the functional layer is the arithmetic mean value of the total thickness at any 10 points in the region other than the raised portions. On the other hand, when the resin layer and the functional layer do not have raised portions, the average total thickness of the resin layer and the functional layer can be the arithmetic mean value of the total thickness at any 10 points.

[0060] Furthermore, when the resin layer 3 and the functional layer 4 have a raised portion 11, as shown in Fig. 1, the maximum value of the total thickness of the raised portion of the resin layer and the functional layer is taken as the maximum value of the total thickness of the raised portion of the resin layer and the functional layer. On the other hand, when the resin layer and the functional layer do not have a raised portion, the maximum value of the total thickness of the resin layer and the functional layer can be taken as the maximum value of the total thickness at any 10 points.

[0061] In this embodiment, the average thickness of the functional layer is, for example, preferably 5 μm or more and less than 15 μm, and more preferably 7 μm or more and 13 μm or less. By having the average thickness of the functional layer within the above range, the occurrence of cracks, whitening, wrinkles, etc. in the functional layer when the display device member is bent can be suppressed, thereby improving flex resistance. In particular, when the functional layer is a hard coat layer, the occurrence of cracks, whitening, wrinkles, etc. in the hard coat layer when the display device member is bent can be suppressed. On the other hand, if the average thickness of the functional layer is too large, the flex resistance may be reduced. Furthermore, if the average thickness of the functional layer is too small, the properties of the functional layer may be reduced. For example, when the functional layer is a hard coat layer, if the average thickness of the hard coat layer is too small, sufficient scratch resistance may not be obtained.

[0062] Furthermore, the ratio of the average thickness of the functional layer to the average total thickness of the resin layer and the functional layer is, for example, preferably 10% to 65%, more preferably 15% to 60%, and even more preferably 20% to 55%. By having the above ratio within the above range, the occurrence of cracks, whitening, wrinkles, etc. in the functional layer when the display device member is bent can be suppressed, thereby improving flex resistance. In particular, when the functional layer is a hard coat layer, the occurrence of cracks, whitening, wrinkles, etc. in the hard coat layer when the display device member is bent can be suppressed. On the other hand, if the above ratio is too large, the flex resistance may be reduced. Furthermore, if the above ratio is too small, the thickness of the functional layer may be reduced, which may result in a deterioration in the properties of the functional layer. For example, when the functional layer is a hard coat layer, if the above ratio is too small, the thickness of the hard coat layer may be reduced, which may result in insufficient scratch resistance.

[0063] Here, the method for measuring the thickness of the functional layer can be the same as the method for measuring the total thickness of the resin layer and the functional layer described above.

[0064] When the functional layer 4 has a raised portion 11 as shown in Fig. 1, the average thickness of the functional layer is the arithmetic mean value of the thicknesses at any 10 points in the region other than the raised portion. On the other hand, when the functional layer does not have a raised portion, the average thickness of the functional layer can be the arithmetic mean value of the thicknesses at any 10 points.

[0065] The average thickness of the resin layer is not particularly limited as long as it satisfies the above-mentioned average value of the total thickness of the resin layer and the functional layer, and the above-mentioned average thickness of the functional layer, and is, for example, preferably 10 μm or more and 55 μm or less, more preferably 15 μm or more and 45 μm or less, and even more preferably 20 μm or more and 35 μm or less. By making the average thickness of the resin layer relatively thin so that it is within the above-mentioned range, flexibility can be increased, and when the display device member is bent, the occurrence of cracks, whitening, wrinkles, etc. in the resin layer can be suppressed, and bending resistance can be maintained.

[0066] Here, the method for measuring the thickness of the resin layer can be the same as the method for measuring the total thickness of the resin layer and the functional layer described above.

[0067] When the resin layer 3 has raised portions 11 as shown in Fig. 1, the average thickness of the resin layer is the arithmetic mean value of the thicknesses at any 10 points in the region other than the raised portions. On the other hand, when the resin layer does not have raised portions, the average thickness of the resin layer can be the arithmetic mean value of the thicknesses at any 10 points.

[0068] In this embodiment, the resin layer and the functional layer have raised portions at their ends, and the cross-sectional shape of the raised portions is approximated to a triangle. When the height of the triangle is the difference between the maximum value of the total thickness of the resin layer and the functional layer and the average value of the total thickness of the resin layer and the functional layer, and the length of the base of the triangle is the distance from the end of the resin layer and the functional layer to the position where the total thickness of the raised portions of the resin layer and the functional layer becomes the average value of the total thickness of the resin layer and the functional layer, the area of ​​the triangle is, for example, 0.08 mm 2 Preferably, it is 0.07 mm or less. 2 It is more preferable that it is 0.06 mm or less. 2 It is more preferable that the area of ​​the triangle is less than 1 / 2. When the area of ​​the triangle is within the above range, cracks, whitening, wrinkles, etc. can be suppressed from occurring in the resin layer and the functional layer when the member for a display device is bent, thereby improving the bending resistance. In particular, when the functional layer is a hard coat layer, cracks, whitening, wrinkles, etc. can be suppressed from occurring in the hard coat layer when the member for a display device is bent. On the other hand, if the area of ​​the triangle is too large, the bending resistance may be reduced.

[0069] Here, a case where the cross-sectional shape of the raised portion of the resin layer and the functional layer is approximated to a triangle will be described with reference to Fig. 3. As shown in Fig. 3, the cross-sectional shape of the raised portion 11 of the resin layer 3 and the functional layer 4 is approximated to a triangle 14 indicated by a dashed line. The height H1 of the triangle 14 is the maximum value T1 of the total thickness of the resin layer 3 and the functional layer 4.max and the average value T1 of the total thickness of the resin layer 3 and the functional layer 4 ave The length D1 of the base of the triangle 14 is the difference between the average value T1 of the total thickness of the resin layer 3 and the functional layer 4 and the total thickness of the protruding portion 11 of the resin layer 3 and the functional layer 4 from the end of the resin layer 3 and the functional layer 4. ave is the distance to the position P1 where

[0070] The total thickness of the resin layer 3 and the protruding portion 11 of the functional layer 4 is equal to the average value T1 ave The position P1 where the total thickness of the resin layer 3 and the functional layer 4 in the protruding portion 11 is the maximum value T1 max , the thickness of the resin layer 3 and the functional layer 4 changes as it gets farther from the end of the resin layer 3 and the functional layer 4, and the average value T1 ave The position is as follows:

[0071] Furthermore, with respect to the position from the end of the resin layer and the functional layer where the total thickness of the protruding portion of the resin layer and the functional layer becomes the average value of the total thickness of the resin layer and the functional layer, as shown in FIG. 4, in the protruding portion 11 of the resin layer 3 and the functional layer 4, when there are multiple peaks of the total thickness of the resin layer 3 and the functional layer 4, and the total thickness of the protruding portion 11 of the resin layer 3 and the functional layer 4 is greater than or equal to the maximum value T1 of the total thickness of the resin layer 3 and the functional layer 4, max , the thickness of the resin layer 3 and the functional layer 4 changes as it gets farther from the end of the resin layer 3 and the functional layer 4, and the average value T1 ave When there are a plurality of positions P1 and P2 where this occurs, the position P1 that is farthest from the ends of the resin layer 3 and the functional layer 4 among these positions P1 and P2 is adopted.

[0072] 2. Resin layer The resin layer in the present disclosure is a layer disposed on one surface of the glass substrate. The resin layer can also function as an impact absorbing layer having impact absorption properties or as a shatterproof layer that suppresses glass from shattering when the glass substrate is broken. The resin layer is transparent, and when the display device member in the present disclosure is disposed on the viewer side of the display panel of the display device, the resin layer is disposed on the viewer side of the glass substrate.

[0073] (1) Resin layer characteristics The resin layer preferably has impact absorption properties. Specifically, the composite elastic modulus of the resin layer is preferably 4.7 GPa or more, more preferably 5.7 GPa or more. When the composite elastic modulus of the resin layer is within the above range, cracking of the glass substrate due to impact can be suppressed, and impact resistance and scratch resistance can be improved.

[0074] Furthermore, according to the method for measuring the composite elastic modulus described below, the composite elastic modulus of the glass substrate is approximately 40 GPa, so the composite elastic modulus of the resin layer is preferably, for example, 40 GPa or less, and more preferably 20 GPa or less.

[0075] Here, the composite elastic modulus of the resin layer is the indentation hardness (H IT ) when measuring the contact projection area A p "Indentation hardness" is a value determined from the load-displacement curve from loading to unloading of the indenter obtained by hardness measurement using the nanoindentation method. The composite elastic modulus of the resin layer is an elastic modulus that includes the elastic deformation of the resin layer and the elastic deformation of the indenter.

[0076] Indentation hardness (H ITThe measurement of the dimensional indentation (DIN) is performed on the measurement sample using a BRUKER TI950 TriboIndenter. Specifically, a 1 mm x 10 mm display component is first embedded in an embedding resin to prepare a block. A uniform, hole-free section with a thickness of 50 nm to 100 nm is then cut from this block using a standard sectioning method. An Ultramicrotome EM UC7 (Leica Microsystems) or similar instrument can be used to prepare the section. The remaining block from which the uniform, hole-free section is cut serves as the measurement sample. Next, a Berkovich indenter (triangular pyramid, BRUKER TI-0039) is pressed vertically into the center of the cross section of the resin layer for 10 seconds to a maximum indentation load of 25 μN under the following measurement conditions: Here, in order to avoid the influence of the glass substrate and the side edges of the resin layer, the Berkovich indenter is pressed into a portion of the resin layer 500 nm away from the interface between the glass substrate and the resin layer toward the center of the resin layer, and 500 nm away from each of the two ends of the resin layer toward the center of the resin layer. It is also pressed into a portion of the resin layer 500 nm away from the interface between the functional layer and the resin layer toward the center of the resin layer. After that, the residual stress is relaxed by holding the pressure constant, and then the pressure is released over 10 seconds. The maximum load after relaxation is measured, and this maximum load P max (μN) and contact projection area A p (nm 2 ) and P max / A p The indentation hardness (H IT The above contact projected area is the contact projected area corrected for the indenter tip curvature by the Oliver-Pharr method using a standard sample of fused quartz (5-0098 manufactured by BRUKER). Indentation hardness (H IT) is the arithmetic mean value of the values ​​obtained by measuring at 10 points. If the measured values ​​include values ​​that deviate from the arithmetic mean value by more than ±20%, those values ​​shall be excluded and remeasured. Whether or not there are any measured values ​​that deviate from the arithmetic mean value by more than ±20% shall be judged by whether the value (%) calculated by (AB) / B x 100 is more than ±20%, where A is the measured value and B is the arithmetic mean value. Indentation hardness (H IT ) can be adjusted by the type of resin contained in the resin layer, which will be described later.

[0077] (Measurement conditions) ·Loading speed: 2.5μN / sec ·Holding time: 5 seconds ·Load unloading speed: 2.5μN / sec ·Measurement temperature: 25℃

[0078] Composite elastic modulus of resin layer E r is the contact projected area A obtained during the indentation hardness measurement using the following formula (1). p The composite elastic modulus is determined by measuring the indentation hardness at 10 locations, calculating the composite elastic modulus each time, and using the arithmetic mean value of the composite elastic moduli obtained at the 10 locations.

[0079]

number

[0080] (In the above formula (1), A p is the contact projected area, and E r is the composite elastic modulus of the resin layer, and S is the contact stiffness.)

[0081] (2) Resin layer material (a) Resin The resin contained in the resin layer is not particularly limited as long as it satisfies the above-mentioned composite elastic modulus and has transparency, and examples thereof include polyimide resins, acrylic resins, epoxy resins, urethane resins, polyesters, triacetyl cellulose (TAC), polycarbonate resins, etc. These resins may be used alone or in combination of two or more.

[0082] In this specification, the term "polyimide resin" refers to a polymer having an imide bond in the main chain, and examples of polyimide resins include polyimide, polyamideimide, polyesterimide, and polyetherimide.

[0083] The following description will be given taking polyimide as an example.

[0084] (Polyimide) Polyimide is obtained by reacting a tetracarboxylic acid component with a diamine component. It is preferable to obtain a polyamic acid by polymerization of the tetracarboxylic acid component and the diamine component, and then imidize the polyamic acid. The imidization may be performed by chemical imidization, thermal imidization, or a combination of chemical imidization and thermal imidization.

[0085] The polyimide is not particularly limited as long as it satisfies the above-mentioned composite elastic modulus and has transparency, but for example, it preferably contains 10 mol % to 100 mol % of structural units represented by the following general formula (1) and (100-x) mol % (where x is the mol % of the structural units represented by the general formula (1)) of structural units represented by the following general formula (2), and has a weight-average molecular weight of 100,000 or more. This is because the polyimide has a tetracarboxylic acid residue with a specific structure containing a parabiphenylene group with a twisted dihedral angle via an ester bond in the main chain, and a diamine residue having an aromatic ring or an aliphatic ring, and has a specific weight-average molecular weight, which makes it easy to achieve a good balance between composite elastic modulus and flex resistance.

[0086] [ka]

[0087] (In general formulas (1) and (2), R 1 ~R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; R 1 and R 2 and at least one of R 3 and R 4 At least one of A represents an alkyl group having 1 to 6 carbon atoms, A represents a tetravalent group which is a tetracarboxylic acid residue having an aromatic ring or an aliphatic ring, and B represents a divalent group which is a diamine residue having an aromatic ring or an aliphatic ring.

[0088] Here, the term "tetracarboxylic acid residue" refers to a residue obtained by removing four carboxyl groups from a tetracarboxylic acid, and has the same structure as a residue obtained by removing an acid dianhydride structure from a tetracarboxylic dianhydride, while the term "diamine residue" refers to a residue obtained by removing two amino groups from a diamine.

[0089] In general formula (1), R 1 and R 2 and at least one of R 3 and R 4 At least one of R represents an alkyl group having 1 to 6 carbon atoms. The alkyl group having 1 to 6 carbon atoms may be a linear or branched alkyl group, and examples thereof include a methyl group, an ethyl group, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a t-butyl group, an n-pentyl group, and an n-hexyl group. From the viewpoint of solvent solubility, an alkyl group having 1 to 4 carbon atoms is preferred, an alkyl group having 1 to 2 carbon atoms is more preferred, and a methyl group is even more preferred. Furthermore, from the viewpoint of solvent solubility, among these, R 1 and R 2 , and R 3 and R 4 preferably represents a methyl group.

[0090] In general formula (1), B represents a divalent group that is a diamine residue having an aromatic ring or an aliphatic ring. The diamine residue having an aromatic ring or an aliphatic ring can be a residue obtained by removing two amino groups from a diamine having an aromatic ring or a diamine having an aliphatic ring.

[0091] Specific examples of diamines having an aromatic ring and diamines having an aliphatic ring include those described in, for example, JP-A-2019-132930 and JP-A-2019-1989. These can be used alone or in combination of two or more.

[0092] In the general formula (2), A represents a tetravalent group that is a tetracarboxylic acid residue having an aromatic ring or an aliphatic ring, and B represents a divalent group that is a diamine residue having an aromatic ring or an aliphatic ring. B in the general formula (2) may be the same as B in the general formula (1), and therefore, a description thereof will be omitted here. B in the general formula (1) and B in the general formula (2) may be the same or different.

[0093] The tetracarboxylic acid residue in A of the general formula (2) can be a residue obtained by removing an acid dianhydride structure from a tetracarboxylic acid dianhydride having an aromatic ring, or a residue obtained by removing an acid dianhydride structure from a tetracarboxylic acid dianhydride having an aliphatic ring.

[0094] Specific examples of tetracarboxylic acid dianhydrides having an aromatic ring and tetracarboxylic acid dianhydrides having an aliphatic ring include those described in, for example, JP-A-2019-132930 and JP-A-2019-1989. These may be used alone or in combination of two or more.

[0095] The polyimide preferably contains 10 mol % or more and 100 mol % or less of the structural unit represented by the general formula (1). From the viewpoint of solubility in a solvent, the polyimide more preferably contains 15 mol % or more of the structural unit represented by the general formula (1), even more preferably 25 mol % or more, and particularly preferably 50 mol % or more.

[0096] On the other hand, in order to improve surface hardness and transparency, a copolymer component may be contained, and the polyimide may contain 95 mol % or less, 90 mol % or less, or 80 mol % or less of the structural unit represented by the above general formula (1).

[0097] Furthermore, the polyimide preferably contains (100-x) mol % (where x is the mol % of the structural unit represented by the general formula (1)) of the structural unit represented by the general formula (2). From the viewpoint of solubility in a solvent, the polyimide more preferably contains 85 mol % or less, even more preferably 75 mol % or less, and particularly preferably 50 mol % or less of the structural unit represented by the general formula (2).

[0098] When the polyimide contains 100 mol % of the structural unit represented by the general formula (1), the structural unit represented by the general formula (2) is 0 mol %, i.e., not contained. The structural unit represented by the general formula (2) may be 0 mol %, but may be contained as a copolymerization component from the viewpoint of improving surface hardness and transparency. The polyimide may contain 5 mol % or more, 10 mol % or more, or 20 mol % or more of the structural unit represented by the general formula (2).

[0099] To improve transparency and surface hardness, at least one of the tetravalent group of the tetracarboxylic acid residue (A) and the divalent group of the diamine residue (B) preferably contains an aromatic ring and at least one selected from the group consisting of (i) a fluorine atom, (ii) an aliphatic ring, and (iii) a structure in which aromatic rings are linked together by a sulfonyl group or an alkylene group optionally substituted with fluorine. When a polyimide contains at least one selected from a tetracarboxylic acid residue having an aromatic ring and a diamine residue having an aromatic ring, the molecular skeleton becomes rigid, improving orientation and surface hardness. However, a rigid aromatic ring skeleton tends to extend the absorption wavelength to longer wavelengths, resulting in reduced transmittance in the visible light region. On the other hand, when a polyimide contains (i) a fluorine atom, the electronic state within the polyimide skeleton becomes less susceptible to charge transfer, thereby improving transparency. When a polyimide contains (ii) an aliphatic ring, the conjugation of π electrons within the polyimide skeleton is severed, thereby inhibiting charge transfer within the skeleton, thereby improving transparency. Furthermore, when the polyimide contains (iii) a structure in which aromatic rings are linked together by a sulfonyl group or an alkylene group which may be substituted with fluorine, the conjugation of π electrons in the polyimide skeleton can be broken, thereby inhibiting the movement of charges within the skeleton, thereby improving transparency.

[0100] In particular, from the viewpoint of improving transparency and surface hardness, it is preferable that at least one of the tetravalent group that is the tetracarboxylic acid residue of A and the divalent group that is the diamine residue of B contains an aromatic ring and a fluorine atom, and it is preferable that the divalent group that is the diamine residue of B contains an aromatic ring and a fluorine atom.

[0101] In terms of transparency, flex resistance and surface hardness, the polyimide is preferably selected from the group consisting of a diamine residue having an aromatic ring or an aliphatic ring in B in the general formulas (1) and (2), a trans-cyclohexanediamine residue, a trans-1,4-bismethylenecyclohexanediamine residue, a 4,4'-diaminodiphenylsulfone residue, a 3,4'-diaminodiphenylsulfone residue, a 2,2-bis(4-aminophenyl)propane residue, a 3,3'-bis(trifluoromethyl)-4,4'-[ Preferably, the divalent group is at least one selected from the group consisting of (1,1,1,3,3,3-hexafluoropropane-2,2-diyl)bis(4,1-phenyleneoxy)]dianiline residue, 2,2-bis[3-(3-aminophenoxy)phenyl]-1,1,1,3,3,3-hexafluoropropane residue, 2,2-bis[4-(4-aminophenoxy)phenyl]-1,1,1,3,3,3-hexafluoropropane residue, and a divalent group represented by the following general formula (3): In particular, from the viewpoint of achieving both transparency and surface hardness, the divalent group is preferably at least one selected from the group consisting of 4,4'-diaminodiphenylsulfone residue, 3,4'-diaminodiphenylsulfone residue, 2,2-bis(4-aminophenyl)propane residue, and a divalent group represented by the following general formula (3), and more preferably a divalent group represented by the following general formula (3): The divalent group represented by the following general formula (3) is R 5 and R 6 is more preferably a perfluoroalkyl group, and among these, a perfluoroalkyl group having 1 to 3 carbon atoms is preferred, and a trifluoromethyl group or a perfluoroethyl group is more preferred. 5 and R 6 The alkyl group in is preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group or an ethyl group.

[0102] [ka]

[0103] (In the general formula (3), R5 and R 6 each independently represents a hydrogen atom, an alkyl group, or a perfluoroalkyl group.

[0104] In particular, from the viewpoints of transparency, flex resistance, and surface hardness, the polyimide is preferably a polyimide in which the tetracarboxylic acid residue having an aromatic ring or an aliphatic ring in A in the general formula (2) is a cyclohexanetetracarboxylic acid dianhydride residue, a cyclopentanetetracarboxylic acid dianhydride residue, a dicyclohexane-3,4,3',4'-tetracarboxylic acid dianhydride residue, a cyclobutanetetracarboxylic acid dianhydride residue, a pyromellitic acid dianhydride residue, a 3,3',4,4'-biphenyltetracarboxylic acid dianhydride residue, a 2,2',3,3' It is preferably at least one tetravalent group selected from the group consisting of a 2,3,3',4'-biphenyltetracarboxylic dianhydride residue, a 4,4'-(hexafluoroisopropylidene)diphthalic anhydride residue, a 3,4'-(hexafluoroisopropylidene)diphthalic anhydride residue, a 3,3'-(hexafluoroisopropylidene)diphthalic anhydride residue, a 4,4'-oxydiphthalic anhydride residue, and a 3,4'-oxydiphthalic anhydride residue.

[0105] A in the above general formula (2) preferably contains 50 mol % or more of these suitable residues in total, more preferably 70 mol % or more, and even more preferably 90 mol % or more.

[0106] In terms of improving surface hardness, A in the above general formula (2) preferably contains a tetracarboxylic acid residue group (Group A) suitable for improving rigidity, such as at least one selected from the group consisting of pyromellitic dianhydride residues, 3,3',4,4'-biphenyltetracarboxylic dianhydride residues, and 2,2',3,3'-biphenyltetracarboxylic dianhydride residues. Furthermore, from the viewpoint of improving transparency, A in the above general formula (2) preferably includes at least one tetracarboxylic acid residue group (Group B) suitable for improving transparency, such as cyclohexanetetracarboxylic dianhydride residue, cyclopentanetetracarboxylic dianhydride residue, dicyclohexane-3,4,3',4'-tetracarboxylic dianhydride residue, cyclobutanetetracarboxylic dianhydride residue, 2,3,3',4'-biphenyltetracarboxylic dianhydride residue, 4,4'-(hexafluoroisopropylidene)diphthalic anhydride residue, 3,4'-(hexafluoroisopropylidene)diphthalic anhydride residue, 3,3'-(hexafluoroisopropylidene)diphthalic anhydride residue, 4,4'-oxydiphthalic anhydride residue, and 3,4'-oxydiphthalic anhydride residue. Group A and Group B may also be used in combination.

[0107] When Group A and Group B are mixed, the content ratio of the tetracarboxylic acid residue group (Group A) suitable for improving the rigidity to the tetracarboxylic acid residue group (Group B) suitable for improving the transparency is preferably 0.05 to 9 moles, more preferably 0.1 to 5 moles, and even more preferably 0.3 to 4 moles, of the tetracarboxylic acid residue group (Group A) suitable for improving the rigidity per mole of the tetracarboxylic acid residue group (Group B) suitable for improving the transparency.

[0108] Among these, from the viewpoint of improving surface hardness and transparency, it is preferable to use at least one of 4,4'-(hexafluoroisopropylidene)diphthalic anhydride residues and 3,4'-(hexafluoroisopropylidene)diphthalic anhydride residues, each containing a fluorine atom, as Group B.

[0109] The content (mol %) of each repeating unit, tetracarboxylic acid residue, and diamine residue in the polyimide can be determined from the molecular weight of the polyimide during production. The content (mol %) of each tetracarboxylic acid residue and diamine residue in the polyimide can also be determined by high-performance liquid chromatography, gas chromatography mass spectrometry, NMR, elemental analysis, XPS / ESCA, and TOF-SIMS on decomposition products of the polyimide obtained in the same manner as above.

[0110] In view of good flex resistance, the polyimide preferably has a weight-average molecular weight of 100,000 or more as measured by gel permeation chromatography in terms of polystyrene. In view of flex resistance, the weight-average molecular weight may be 120,000 or more, 140,000 or more, or 160,000 or more. On the other hand, in view of the reduced risk of bubble defects, the weight-average molecular weight is preferably 270,000 or less. Furthermore, in view of solubility, the weight-average molecular weight may be 250,000 or less, 230,000 or less, or 210,000 or less.

[0111] The weight-average molecular weight of polyimide can be measured by gel permeation chromatography (GPC). Specifically, polyimide is dissolved in N-methylpyrrolidone (NMP) at a concentration of 0.1% by mass, and the developing solvent is a 30 mmol% LiBr-NMP solution with a water content of 500 ppm or less. Measurements are performed using a Tosoh GPC system (HLC-8120, column: SHODEX GPC LF-804) with a sample load of 50 μL, a solvent flow rate of 0.4 mL / min, and a temperature of 37°C. The weight-average molecular weight is determined based on a polystyrene standard sample of the same concentration as the sample.

[0112] (b) Leveling agent The resin layer preferably contains a leveling agent, which allows the maximum total thickness of the resin layer and the functional layer to be controlled within a predetermined range, thereby making it difficult for raised portions to form at the ends of the resin layer and the functional layer.

[0113] The leveling agent contained in the resin layer is not particularly limited, and examples thereof include silicone-based leveling agents, fluorine-based leveling agents, acrylic-based leveling agents, and vinyl-based leveling agents. These leveling agents may be used alone or in combination of two or more. Among these, silicone-based leveling agents and fluorine-based leveling agents are preferred because of their high ability to reduce surface tension.

[0114] The content of the leveling agent in the resin layer is not particularly limited, but is preferably 0.01% by mass or more and 3% by mass or less, more preferably 0.05% by mass or more and 2% by mass or less, and even more preferably 0.1% by mass or more and 1% by mass or less. If the content of the leveling agent is too low, the effect of the leveling agent may not be fully obtained. If the content of the leveling agent is too high, the strength of the resin layer may be reduced. If the leveling agent is a silicone-based leveling agent or a fluorine-based leveling agent, if the content of the leveling agent is too high, repelling or peeling may occur when forming a functional layer on the resin layer.

[0115] (c) UV absorber The resin layer may contain an ultraviolet absorber. This can suppress deterioration of the resin layer due to ultraviolet rays. In particular, when the resin layer contains polyimide, it can suppress color change over time in the resin layer containing polyimide. Furthermore, in a display device including a display device member, it can suppress deterioration due to ultraviolet rays of components arranged on the display panel side of the display device member, such as a polarizer.

[0116] Examples of the ultraviolet absorber contained in the resin layer include triazine-based ultraviolet absorbers, benzophenone-based ultraviolet absorbers such as hydroxybenzophenone-based ultraviolet absorbers, and benzotriazole-based ultraviolet absorbers.

[0117] Specific examples of triazine-based UV absorbers, benzophenone-based UV absorbers such as hydroxybenzophenone-based UV absorbers, and benzotriazole-based UV absorbers include those described in JP-A-2019-132930.

[0118] Among the ultraviolet absorbers, triazine-based ultraviolet absorbers, hydroxybenzophenone-based ultraviolet absorbers, and benzotriazole-based ultraviolet absorbers are preferably used.

[0119] Furthermore, the ultraviolet absorber is preferably a polymer or oligomer, because this can prevent the ultraviolet absorber from bleeding out when the display device member is repeatedly bent. Examples of such ultraviolet absorbers include polymers or oligomers having a triazine skeleton, a benzophenone skeleton, or a benzotriazole skeleton. Specifically, it is preferable to use a polymer or oligomer obtained by thermally copolymerizing a (meth)acrylate having a benzotriazole skeleton or a benzophenone skeleton with methyl methacrylate (MMA) in any ratio.

[0120] The content of the ultraviolet absorber in the resin layer is not particularly limited, but is preferably 1% by mass or more and 6% by mass or less, and more preferably 2% by mass or more and 5% by mass or less. If the content of the ultraviolet absorber is too low, the effect of the ultraviolet absorber may not be fully obtained. On the other hand, if the content of the ultraviolet absorber is too high, the resin layer may be significantly colored or the strength of the resin layer may be reduced.

[0121] (d) Other additives The resin layer may further contain additives as needed, such as inorganic particles, silica fillers for facilitating winding, surfactants for improving film-forming properties and defoaming properties, and adhesion improvers.

[0122] (3) Resin layer structure In this embodiment, the resin layer may have raised portions at its edges. As described above, when a resin layer is formed on one surface of a glass substrate by a coating method, the thickness of the edges of the functional layer increases due to surface tension, and raised portions 11 tend to form at the edges of the resin layer 3, as shown in FIG. 1, for example. In this embodiment, by suppressing the raised portions at the edges of the resin layer, the maximum total thickness of the raised portions of the resin layer and the functional layer can be kept below a predetermined value, thereby improving flex resistance.

[0123] The resin layer may be a single layer or may have multiple layers. When the resin layer has multiple layers, the materials of the multiple layers may be the same or different from each other. When the resin layer has a plurality of layers, the average thicknesses of the layers may be the same or different from each other.

[0124] (4) Method for forming resin layer Examples of methods for forming a resin layer include a method of applying a resin composition onto a glass substrate. The application method is not particularly limited as long as it is a method that can apply the resin to the desired thickness, and examples include general application methods such as gravure coating, gravure reverse coating, gravure offset coating, spin coating, roll coating, reverse roll coating, blade coating, dip coating, screen printing, and die coating. Furthermore, a transfer method in which a resin layer is transferred onto a glass substrate can also be used as a method for forming a resin layer. Among these, the die coating method and the transfer method are preferred because they are less likely to form raised portions at the edges.

[0125] Hereinafter, an example in which the resin layer contains polyimide will be described.

[0126] (Method for forming a polyimide-containing resin layer) Examples of methods for forming a polyimide-containing resin layer include a method of applying a polyimide varnish containing polyimide and an organic solvent to a glass substrate and drying the varnish, and a method of applying a polyimide precursor composition containing a polyimide precursor (polyamic acid) and an organic solvent to a glass substrate and then imidizing the polyimide precursor by heat treatment or chemical treatment. The former method can ease the heating conditions in the film formation process. On the other hand, the latter method eliminates restrictions on the solubility of the polyimide, thereby increasing the options for the chemical structure of the polyimide.

[0127] Among these, the following manufacturing method is preferred because it is less likely to cause bubble defects and makes it easier to obtain a resin layer with good thickness uniformity.

[0128] The method for forming a polyimide-containing resin layer preferably includes the following steps: a preparation step of preparing a polyimide varnish containing polyimide and an organic solvent, wherein the polyimide content in the polyimide varnish is 6% by mass or more and 15% by mass or less and the polyimide has a viscosity at 25°C of 1,000 cps or more and 50,000 cps or less; a coating step of applying the polyimide varnish to a glass substrate; a first drying step of drying the coating at a temperature of 140°C or less; and a second drying step of heating the coating at a temperature of 200°C or more after drying.

[0129] When polyimide dissolves well in organic solvents, the heating conditions in the film-forming process can be alleviated, so it is preferable to form a resin layer using a polyimide varnish obtained by dissolving polyimide in an organic solvent. When polyimide has a specific amount or more of structural units containing tetracarboxylic acid residues of a specific structure containing a parabiphenylene group with a twisted dihedral angle via an ester bond in the main chain, it is easily soluble in organic solvents. When polyimide has a solvent solubility such that it dissolves in an organic solvent at 25°C in an amount of 6% by mass or more, the above-mentioned resin layer formation method can be suitably used.

[0130] According to the above-described method for forming a resin layer, the polyimide content in the varnish can be increased to a sufficient concentration, and the varnish can be adjusted to a desired viscosity range, so that a resin layer with good thickness uniformity and with little bubble defects can be obtained.

[0131] The organic solvent is not particularly limited as long as it can dissolve polyimide, and for example, an aprotic polar solvent or a water-soluble alcohol solvent can be used. Among them, organic solvents containing nitrogen atoms such as N-methyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, hexamethylphosphoramide, and 1,3-dimethyl-2-imidazolidinone; γ-butyrolactone, etc. are preferred. The organic solvents can be used alone or in combination of two or more.

[0132] For the method of forming the resin layer containing the polyimide, reference can be made to the methods described in, for example, JP-A-2019-1989 and JP-A-2019-182974.

[0133] 3. Functional Layer The functional layer in the present disclosure is a layer disposed on the side of the resin layer opposite to the glass substrate. An example of the functional layer is a hard coat layer.

[0134] The hard coat layer is a layer for increasing the surface hardness, and by disposing the hard coat layer, it is possible to improve the scratch resistance.

[0135] (1) Characteristics of the hard coat layer Here, the term "hard coat layer" refers to a layer for increasing the surface hardness, and specifically refers to a layer that exhibits a hardness of "H" or higher when subjected to a pencil hardness test specified in JIS K 5600-5-4 (1999) in a display device component.

[0136] The pencil hardness of the surface of the member for a display device on the side of the hard coat layer is, for example, preferably H or more, more preferably 2H or more, and even more preferably 3H or more.

[0137] Here, pencil hardness is measured by the pencil hardness test specified in JIS K5600-5-4 (1999). Specifically, a pencil hardness test specified in JIS K5600-5-4 (1999) is performed on the surface of the hard coat layer side of a display device member using a test pencil specified in JIS-S-6006, and the highest pencil hardness that does not cause scratches is evaluated. Pencil hardness is measured on a display device member having a glass substrate, a resin layer, and a hard coat layer in this order. Measurement conditions can be an angle of 45°, a load of 750 g, a speed of 0.5 mm / sec to 1 mm / sec, and a temperature of 23±2°C. For example, a pencil hardness tester manufactured by Toyo Seiki Co., Ltd. can be used.

[0138] The hard coat layer is a layer having a higher hardness than the resin layer. Specifically, the composite elastic modulus of the hard coat layer is preferably higher than the composite elastic modulus of the resin layer. The composite elastic modulus of the hard coat layer is, for example, preferably 4.8 GPa or more, and more preferably 5.8 GPa or more.

[0139] Furthermore, according to the above-mentioned method for measuring the composite elastic modulus, since the composite elastic modulus of the glass substrate is approximately 40 GPa, the composite elastic modulus of the hard coat layer is, for example, preferably 40 GPa or less, and more preferably 20 GPa or less.

[0140] The method for measuring the composite elastic modulus of the hard coat layer can be the same as the method for measuring the composite elastic modulus of the resin layer.

[0141] (2) Hard Coat Layer Configuration In this embodiment, the hard coat layer may have raised portions at its edges. As described above, when a resin layer is formed on one surface of a glass substrate by a coating method, the thickness of the edges of the hard coat layer increases due to surface tension, and raised portions 11 tend to form at the edges of the functional layer 4 (hard coat layer), as shown in FIG. 1, for example. In this embodiment, by suppressing the raised portions at the edges of the hard coat layer, the maximum total thickness of the raised portions of the resin layer and the functional layer (hard coat layer) can be kept below a predetermined value, thereby improving flex resistance.

[0142] The hard coat layer may be a single layer or may have multiple layers. When the hard coat layer has multiple layers, it preferably has a layer for satisfying pencil hardness and a layer for satisfying a dynamic bending test (a layer for satisfying scratch resistance) in order to improve surface hardness and achieve a good balance between flex resistance and elastic modulus.

[0143] (3) Hard Coat Layer Material (a) Polymerizable compound Examples of materials for the hard coat layer include a resin composition containing a polymerizable compound. Specifically, the hard coat layer preferably contains a cured product of a resin composition containing a polymerizable compound. The cured product of a resin composition containing a polymerizable compound can be obtained by polymerizing the polymerizable compound using a polymerization initiator as needed by a known method.

[0144] The polymerizable compound has at least one polymerizable functional group in the molecule, and may be, for example, at least one of a radical polymerizable compound and a cation polymerizable compound.

[0145] The radical polymerizable compound is a compound having a radical polymerizable group. The radical polymerizable group of the radical polymerizable compound is not particularly limited as long as it is a functional group capable of causing a radical polymerization reaction, and examples thereof include groups containing a carbon-carbon unsaturated double bond, and specific examples thereof include a vinyl group and a (meth)acryloyl group. When the radical polymerizable compound has two or more radical polymerizable groups, these radical polymerizable groups may be the same or different.

[0146] The number of radically polymerizable groups that the radically polymerizable compound has in one molecule is preferably 2 or more, more preferably 3 or more, from the viewpoint of improving the hardness of the hard coat layer.

[0147] Among radical polymerizable compounds, compounds having a (meth)acryloyl group are preferred in terms of high reactivity. For example, polyfunctional (meth)acrylate monomers and oligomers having several (meth)acryloyl groups in the molecule and molecular weights of several hundred to several thousand, such as urethane (meth)acrylate, polyester (meth)acrylate, epoxy (meth)acrylate, melamine (meth)acrylate, polyfluoroalkyl (meth)acrylate, and silicone (meth)acrylate, are preferably used. Polyfunctional (meth)acrylate polymers having two or more (meth)acryloyl groups in the side chains of the acrylate polymer are also preferably used. Among these, polyfunctional (meth)acrylate monomers having two or more (meth)acryloyl groups in one molecule are preferably used. By including a cured product of a polyfunctional (meth)acrylate monomer in the hard coat layer, the hardness of the hard coat layer can be improved, and adhesion can also be improved. Also, polyfunctional (meth)acrylate oligomers or polymers having two or more (meth)acryloyl groups in one molecule can be preferably used. When the hard coat layer contains a cured product of the polyfunctional (meth)acrylate oligomer or polymer, the hardness and flex resistance of the hard coat layer can be improved, and further, the adhesion can be improved.

[0148] In this specification, (meth)acryloyl refers to both acryloyl and methacryloyl, and (meth)acrylate refers to both acrylate and methacrylate.

[0149] Specific examples of polyfunctional (meth)acrylate monomers include those described in JP-A-2019-132930. Among these, from the viewpoints of high reactivity, improved hardness of the hard coat layer, and adhesion, those having 3 to 6 (meth)acryloyl groups in one molecule are preferred. For example, pentaerythritol triacrylate (PETA), dipentaerythritol hexaacrylate (DPHA), pentaerythritol tetraacrylate (PETTA), dipentaerythritol pentaacrylate (DPPA), trimethylolpropane tri(meth)acrylate, tripentaerythritol octa(meth)acrylate, tetrapentaerythritol deca(meth)acrylate, etc. can be preferably used, and in particular, at least one selected from pentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexaacrylate, and those modified with PO, EO, or caprolactone is preferred.

[0150] The resin composition may contain a monofunctional (meth)acrylate monomer as a radical polymerizable compound to adjust hardness and viscosity, improve adhesion, etc. Specific examples of the monofunctional (meth)acrylate monomer include those described in JP-A-2019-132930.

[0151] The cationically polymerizable compound is a compound having a cationically polymerizable group. The cationically polymerizable group of the cationically polymerizable compound is not particularly limited as long as it is a functional group capable of causing a cationic polymerization reaction, and examples thereof include an epoxy group, an oxetanyl group, and a vinyl ether group. When the cationically polymerizable compound has two or more cationically polymerizable groups, these cationically polymerizable groups may be the same or different.

[0152] The number of cationically polymerizable groups that the cationically polymerizable compound has in one molecule is preferably 2 or more, more preferably 3 or more, from the viewpoint of improving the hardness of the hard coat layer.

[0153] Among the cationically polymerizable compounds, compounds having at least one of an epoxy group and an oxetanyl group as the cationically polymerizable group are preferred, and compounds having two or more of at least one of an epoxy group and an oxetanyl group per molecule are more preferred. Cyclic ether groups such as epoxy groups and oxetanyl groups are preferred because they cause minimal shrinkage during polymerization. Among cyclic ether groups, compounds having an epoxy group are readily available in a variety of structures, do not adversely affect the durability of the resulting hard coat layer, and are advantageous in that their compatibility with radically polymerizable compounds is easily controlled. Among cyclic ether groups, oxetanyl groups have a higher degree of polymerization and lower toxicity than epoxy groups. When the resulting hard coat layer is combined with a compound having an epoxy group, they accelerate the network formation rate from the cationically polymerizable compound in the coating film, forming an independent network without leaving unreacted monomers in the film, even in regions where the radically polymerizable compound coexists.

[0154] Examples of the cationically polymerizable compound having an epoxy group include alicyclic epoxy resins obtained by epoxidizing polyglycidyl ethers of polyhydric alcohols having an alicyclic ring or cyclohexene ring- or cyclopentene ring-containing compounds with a suitable oxidizing agent such as hydrogen peroxide or peracid; aliphatic epoxy resins such as polyglycidyl ethers of aliphatic polyhydric alcohols or their alkylene oxide adducts, polyglycidyl esters of aliphatic long-chain polybasic acids, and glycidyl (meth)acrylate homopolymers and copolymers; and glycidyl ether-type epoxy resins derived from bisphenols, such as bisphenol A, bisphenol F, and hydrogenated bisphenol A, or derivatives thereof, such as alkylene oxide adducts or caprolactone adducts, and novolac epoxy resins.

[0155] Specific examples of alicyclic epoxy resins, glycidyl ether epoxy resins, and cationically polymerizable compounds having an oxetanyl group include those described in JP-A-2018-104682.

[0156] The cured product of the resin composition containing the polymerizable compound contained in the hard coat layer can be analyzed using a Fourier transform infrared spectrophotometer (FTIR), a pyrolysis gas chromatograph (GC-MS), or the decomposition product of the polymer can be analyzed using a combination of high performance liquid chromatography, a gas chromatograph mass spectrometer, NMR, elemental analysis, XPS / ESCA, and TOF-SIMS.

[0157] (b) Polymerization initiator The resin composition may contain a polymerization initiator as needed. The polymerization initiator may be appropriately selected from radical polymerization initiators, cationic polymerization initiators, radical and cationic polymerization initiators, etc. These polymerization initiators are decomposed by at least one of light irradiation and heating to generate radicals or cations, thereby promoting radical polymerization and cationic polymerization. Note that in some cases, the polymerization initiator may be completely decomposed and not remain in the hard coat layer.

[0158] Specific examples of radical polymerization initiators and cationic polymerization initiators include those described in JP-A-2018-104682.

[0159] (c) Particles The hard coat layer preferably contains inorganic or organic particles, more preferably inorganic fine particles, which can improve the hardness of the hard coat layer.

[0160] Examples of inorganic particles include metal oxide particles such as silica (SiO), aluminum oxide, zirconia, titania, zinc oxide, germanium oxide, indium oxide, tin oxide, indium tin oxide (ITO), antimony oxide, and cerium oxide; metal fluoride particles such as magnesium fluoride and sodium fluoride; metal particles; metal sulfide particles; and metal nitride particles. Among these, metal oxide particles are preferred, and at least one selected from silica particles and aluminum oxide particles is more preferred, with silica particles being even more preferred because excellent hardness can be obtained.

[0161] The inorganic particles are preferably reactive inorganic particles having, at least on a part of their surface, photoreactive reactive functional groups capable of forming covalent bonds by crosslinking with each other or with at least one polymerizable compound. The hardness of the hard coat layer can be further improved by crosslinking with each other or with at least one of a radical polymerizable compound and a cation polymerizable compound.

[0162] The reactive inorganic particles have at least a portion of their surface coated with an organic component and have reactive functional groups on their surface introduced by the organic component. Examples of the reactive functional groups include polymerizable unsaturated groups, and more preferably photocurable unsaturated groups. Examples of the reactive functional groups include ethylenically unsaturated bonds such as (meth)acryloyl groups, vinyl groups, and allyl groups, and epoxy groups.

[0163] The reactive silica particles are not particularly limited, and conventionally known ones can be used, such as the reactive silica particles described in JP 2008-165040 A. Commercially available reactive silica particles include MIBK-SD, MIBK-SDMS, MIBK-SDL, and MIBK-SDZL manufactured by Nissan Chemical Industries, Ltd., and V8802 and V8803 manufactured by JGC Catalysts and Chemicals, Ltd.

[0164] In addition, silica particles may be spherical silica particles, but preferably irregular silica particles.Spherical silica particles and irregular silica particles may be mixed.In this specification, irregular silica particles refer to silica particles with a shape that has random potato-like irregularities on the surface.Since irregular silica particles have a larger surface area than spherical silica particles, by including such irregular silica particles, the contact area with the resin component etc. is increased, and the hardness of the hard coat layer can be improved.

[0165] Whether or not the silica particles are irregular shaped can be confirmed by observing the cross section of the hard coat layer with an electron microscope.

[0166] The average particle size of the inorganic particles is preferably 5 nm or more, more preferably 10 nm or more, from the viewpoint of improving hardness. If the average particle size of the inorganic particles is too small, it may be difficult to produce the particles and the particles may be prone to agglomeration. Furthermore, from the viewpoint of transparency, the average particle size of the inorganic particles is preferably 200 nm or less, more preferably 100 nm or less, and even more preferably 50 nm or less. If the average particle size of the inorganic particles is too large, there is a risk that large irregularities may be formed in the hard coat layer or that the haze may be high.

[0167] Here, the average particle size of the inorganic particles can be measured by observing the cross section of the hard coat layer with an electron microscope, and the average particle size is the average of the particle sizes of 10 arbitrarily selected particles. The average particle size of the irregular silica particles is the average of the maximum (longer diameter) and minimum (minor diameter) distances between two points on the periphery of the irregular silica particles that appear in the cross section of the hard coat layer with a microscope.

[0168] The hardness of the hard coat layer can be controlled by adjusting the size and content of the inorganic particles. For example, the content of the silica particles is preferably 25 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the polymerizable compound.

[0169] (d) Leveling agent The hard coat layer preferably contains a leveling agent, which allows the maximum total thickness of the resin layer and the functional layer to be controlled within a predetermined range, thereby making it difficult for raised portions to form at the ends of the resin layer and the functional layer.

[0170] The leveling agent contained in the hard coat layer is not particularly limited, and examples thereof include silicone-based leveling agents, fluorine-based leveling agents, acrylic-based leveling agents, and vinyl-based leveling agents. These leveling agents may be used alone or in combination of two or more. Among these, silicone-based leveling agents and fluorine-based leveling agents are preferred because of their high ability to reduce surface tension.

[0171] The content of the leveling agent in the hard coat layer is not particularly limited, but is preferably 0.01% by mass or more and 3% by mass or less, more preferably 0.05% by mass or more and 2% by mass or less, and even more preferably 0.1% by mass or more and 1% by mass or less. If the content of the leveling agent is too low, the effect of the leveling agent may not be fully obtained. On the other hand, if the content of the leveling agent is too high, the hardness of the hard coat layer may be reduced.

[0172] (e) UV absorber The hard coat layer may contain an ultraviolet absorber. This can suppress deterioration of the resin layer due to ultraviolet rays. In particular, when the resin layer contains polyimide, it can suppress color change over time in the resin layer containing polyimide. Furthermore, in a display device including a display device member, it can suppress deterioration due to ultraviolet rays of components arranged on the display panel side of the display device member, such as polarizers.

[0173] The ultraviolet absorber contained in the hard coat layer preferably has an absorption wavelength peak in absorbance measurement of 300 nm to 390 nm, more preferably 320 nm to 370 nm, and even more preferably 330 nm to 370 nm. This is because such an ultraviolet absorber can efficiently absorb ultraviolet rays in the UVA region, and can form a hard coat layer having ultraviolet absorbing ability without causing curing inhibition of the hard coat layer by shifting the peak wavelength from the absorption wavelength of 250 nm of the initiator for curing the hard coat layer.

[0174] Among them, it is preferable that the ultraviolet absorber has an absorption wavelength peak of 380 nm or less, since coloring caused by the ultraviolet absorber can be suppressed.

[0175] The absorbance of the ultraviolet absorber can be measured using, for example, an ultraviolet-visible-near infrared spectrophotometer (for example, V-7100 manufactured by JASCO Corporation).

[0176] The ultraviolet absorber may be the same as the ultraviolet absorber used in the resin layer.

[0177] Among these, from the viewpoint of suppressing deterioration of the resin layer due to ultraviolet rays, one or more ultraviolet absorbers selected from the group consisting of hydroxybenzophenone-based ultraviolet absorbers and benzotriazole-based ultraviolet absorbers are preferred, and one or more ultraviolet absorbers selected from the group consisting of hydroxybenzophenone-based ultraviolet absorbers are more preferred.

[0178] Specific examples of hydroxybenzophenone-based ultraviolet absorbers include those described in JP-A-2019-132930.

[0179] Among the hydroxybenzophenone-based ultraviolet absorbers, 2-hydroxybenzophenone-based ultraviolet absorbers are preferred, and one or more selected from the group consisting of benzophenone-based ultraviolet absorbers having the following general formula (A) are more preferred. These can suppress deterioration of the resin layer due to ultraviolet rays and improve durability.

[0180] [ka]

[0181] (In the general formula (A), X 1 and X 2 are each independently a hydroxyl group, -OR a or a hydrocarbon group having 1 to 15 carbon atoms, R a represents a hydrocarbon group having 1 to 15 carbon atoms.

[0182] In general formula (A), X 1 , X 2 and R aExamples of the hydrocarbon group having 1 to 15 carbon atoms in the formula (I) include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a dodecyl group, an allyl group, and a benzyl group. Each of the aliphatic hydrocarbon groups having 3 or more carbon atoms may be linear or branched. The hydrocarbon group preferably has 1 to 12 carbon atoms, and more preferably has 1 to 8 carbon atoms. In terms of facilitating an improvement in transparency, the hydrocarbon group is preferably an aliphatic hydrocarbon group, and of these, a methyl group and an allyl group are preferred.

[0183] X is a material that is easy to improve durability. 1 and X 2 are each independently a hydroxyl group or -OR a It is preferable that:

[0184] The one or more selected from the group consisting of benzophenone-based ultraviolet absorbers having general formula (A) is preferably one or more selected from the group consisting of 2,2',4,4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, and 2,2'-dihydroxy-4,4'-diallyloxybenzophenone, and more preferably one or more selected from the group consisting of 2,2',4,4'-tetrahydroxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone.

[0185] Specific examples of benzotriazole-based ultraviolet absorbers include those described in JP-A-2019-132930.

[0186] Among the benzotriazole-based UV absorbers, 2-(2-hydroxyphenyl)benzotriazoles are preferred, and one or more selected from the group consisting of benzotriazole-based UV absorbers having the following general formula (B) are more preferred, which can suppress deterioration of the resin layer due to UV rays and improve durability.

[0187] [ka]

[0188] (In the general formula (B), Y 1 , Y 2 , and Y 3 are each independently a hydrogen atom, a hydroxyl group, or -OR b or a hydrocarbon group having 1 to 15 carbon atoms, R b represents a hydrocarbon group having 1 to 15 carbon atoms, and Y 1 , Y 2 , and Y 3 At least one of the groups is a hydroxyl group, -OR b or a hydrocarbon group having 1 to 15 carbon atoms. 4 represents a hydrogen atom or a halogen atom.

[0189] In general formula (B), Y 1 , Y 2 , and Y 3 , and R b In the formula (I), examples of the hydrocarbon group having 1 to 15 carbon atoms include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, and a dodecyl group. Each of the aliphatic hydrocarbon groups having 3 or more carbon atoms may be linear or branched. The hydrocarbon group preferably has 1 to 12 carbon atoms, and more preferably has 1 to 8 carbon atoms. In terms of facilitating improved transparency, the hydrocarbon group is preferably an aliphatic hydrocarbon group, and is preferably a linear or branched alkyl group, and among these, a methyl group, a t-butyl group, a t-pentyl group, an n-octyl group, or a t-octyl group is preferred.

[0190] In general formula (B), Y 4 Examples of the halogen atom in include a chlorine atom, a fluorine atom, and a bromine atom, and among these, a chlorine atom is preferred.

[0191] In general formula (B), Y 1 , and Y 3 is a hydrogen atom, and Y 2 is a hydroxyl group or -OR band more preferably one or more selected from the group consisting of 2-(2-hydroxy-4-octyloxyphenyl)-2H-benzotriazole and 2-(2,4-dihydroxyphenyl)-2H-benzotriazole. This can suppress deterioration of the resin layer due to ultraviolet light and improve durability.

[0192] The content of the ultraviolet absorber in the hard coat layer is, for example, preferably 10% by mass or less, more preferably 7% by mass or less, from the viewpoint of suppressing haze caused by mixing the ultraviolet absorber. Also, from the viewpoint of suppressing deterioration of the resin layer due to ultraviolet rays and improving durability, the content of the ultraviolet absorber in the hard coat layer is preferably 1% by mass or more and 6% by mass or less, more preferably 2% by mass or more and 5% by mass or less.

[0193] (f) Antifouling agent The hard coat layer may contain an antifouling agent, which can impart antifouling properties to the member for a display device.

[0194] The antifouling agent is not particularly limited, and examples thereof include silicone-based antifouling agents, fluorine-based antifouling agents, and silicone-based and fluorine-based antifouling agents. The antifouling agent may also be an acrylic-based antifouling agent. One type of antifouling agent may be used alone, or two or more types may be mixed and used.

[0195] A hard coat layer containing a silicone-based antifouling agent or a fluorine-based antifouling agent is less susceptible to fingerprints (less noticeable) and has good wiping properties. Furthermore, when a silicone-based antifouling agent or a fluorine-based antifouling agent is contained, the surface tension of the curable resin composition for a hard coat layer can be reduced during application, resulting in good leveling properties and a good appearance of the resulting hard coat layer.

[0196] Furthermore, a hard coat layer containing a silicone-based antifouling agent has good slipperiness and good scratch resistance, and a display device including a display device member having a hard coat layer containing such a silicone-based antifouling agent has good slipperiness when touched with a finger, a pen, or the like, resulting in a good tactile feel.

[0197] The antifouling agent preferably has a reactive functional group in order to improve the durability of the antifouling performance. If the antifouling agent does not have a reactive functional group, regardless of whether the display device member is in the form of a roll or a sheet, when the display device member is stacked, the antifouling agent will be transferred to the surface opposite to the hard coat layer side of the display device member, and when another layer is attached or applied to the surface opposite to the hard coat layer side of the display device member, the other layer may peel off, and further, the other layer may be easily peeled off when repeatedly bent. In contrast, when the antifouling agent has a reactive functional group, the antifouling performance will be more durable.

[0198] The number of reactive functional groups in the antifouling agent may be 1 or more, and preferably 2 or more. By using an antifouling agent having 2 or more reactive functional groups, excellent scratch resistance can be imparted to the hard coat layer.

[0199] The antifouling agent preferably has a weight-average molecular weight of not more than 5000. The weight-average molecular weight of the antifouling agent can be measured by gel permeation chromatography (GPC).

[0200] The antifouling agent may be uniformly dispersed in the hard coat layer, but from the viewpoint of obtaining sufficient antifouling properties with a small amount added and suppressing a decrease in the strength of the hard coat layer, it is preferable that the antifouling agent be unevenly distributed on the surface side of the hard coat layer.

[0201] Examples of methods for unevenly distributing the antifouling agent on the surface side of the hard coat layer include a method in which, when forming the hard coat layer, a coating film of a curable resin composition for a hard coat layer is dried and heated before being cured to reduce the viscosity of the resin component contained in the coating film, thereby increasing the fluidity and thereby unevenly distributing the antifouling agent on the surface side of the hard coat layer; and a method in which an antifouling agent with low surface tension is used, and the antifouling agent is floated on the surface of the coating film without applying heat when drying the coating film, and then the coating film is cured, thereby unevenly distributing the antifouling agent on the surface side of the hard coat layer.

[0202] The content of the antifouling agent is preferably, for example, 0.01 to 3.0 parts by mass per 100 parts by mass of the resin component. If the content of the antifouling agent is too low, sufficient antifouling properties may not be imparted to the hard coat layer, whereas if the content of the antifouling agent is too high, the hardness of the hard coat layer may decrease.

[0203] (g) Other additives The hard coat layer may further contain additives as necessary. The additives are appropriately selected depending on the function to be imparted to the hard coat layer, and are not particularly limited, and examples thereof include inorganic or organic particles for adjusting the refractive index, infrared absorbers, antiglare agents, antifouling agents, antistatic agents, colorants such as blue pigments and purple pigments, surfactants, lubricants, various sensitizers, flame retardants, adhesion promoters, polymerization inhibitors, antioxidants, light stabilizers, and surface modifiers.

[0204] (4) Method for forming a hard coat layer Examples of methods for forming the hard coat layer include a method in which a curable resin composition for a hard coat layer containing the polymerizable compound and the like is applied onto the resin layer and then cured.

[0205] The curable resin composition for a hard coat layer contains a polymerizable compound, and may further contain a polymerization initiator, particles, an ultraviolet absorber, a solvent, an additive, and the like, as necessary.

[0206] The method for applying the curable resin composition for a hard coat layer onto the resin layer is not particularly limited as long as it can be applied to the desired thickness, and examples thereof include common application methods such as gravure coating, gravure reverse coating, gravure offset coating, spin coating, roll coating, reverse roll coating, blade coating, dip coating, screen printing, and die coating. A transfer method can also be used to form a coating film of the resin composition for a hard coat layer. Among these, the die coating method and transfer method are preferred because they are less likely to form raised portions at the edges.

[0207] The coating film of the curable resin composition for the hard coat layer is dried as needed to remove the solvent. Examples of drying methods include vacuum drying, heat drying, and a combination of these drying methods. For example, the coating film can be dried by heating at a temperature of 30°C to 120°C for 10 to 180 seconds.

[0208] The method for curing the coating film of the curable resin composition for the hard coat layer is appropriately selected depending on the polymerizable group of the polymerizable compound, and for example, at least one of light irradiation and heating can be used.

[0209] For light irradiation, ultraviolet rays, visible light, electron beams, ionizing radiation, etc. are mainly used. In the case of ultraviolet curing, for example, ultraviolet rays emitted from the light beam of an ultra-high pressure mercury lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc, xenon arc, metal halide lamp, etc. can be used. The irradiation dose of the energy ray source is, for example, 50 mJ / cm as the cumulative exposure dose at an ultraviolet wavelength of 365 nm. 2 More than 5000mJ / cm 2 It can be set to the following extent.

[0210] When heating is performed, the treatment can be performed at a temperature of, for example, 40° C. or higher and 120° C. or lower. Alternatively, the reaction may be carried out by leaving the mixture at room temperature (25° C.) for 24 hours or more.

[0211] 4. Glass substrate The glass substrate in this embodiment has a thickness of 100 μm or less and is a member that supports the resin layer and the functional layer.

[0212] The glass constituting the glass substrate is not particularly limited, but chemically strengthened glass is preferable. Chemically strengthened glass is preferable because it has excellent mechanical strength and can be made thinner accordingly. Chemically strengthened glass is typically glass whose mechanical properties have been strengthened by a chemical method by partially exchanging ion species near the surface of the glass, such as by replacing sodium with potassium, and has a compressive stress layer on the surface.

[0213] Examples of glasses that can be used to form chemically strengthened glass substrates include aluminosilicate glass, soda-lime glass, borosilicate glass, lead glass, alkali barium glass, and aluminoborosilicate glass.

[0214] Examples of commercially available chemically strengthened glass substrates include Gorilla Glass from Corning, Dragontrail from AGC, and chemically strengthened glass from Schott.

[0215] The thickness of the glass substrate is 100 μm or less, preferably 15 μm or more and 100 μm or less, more preferably 20 μm or more and 90 μm or less, and even more preferably 25 μm or more and 80 μm or less. A glass substrate having a thin thickness within the above range can provide good flexibility and sufficient hardness. It can also suppress curling of the display device member. Furthermore, this is preferable in terms of reducing the weight of the display device member.

[0216] Here, the thickness of the glass substrate can be the average value of thicknesses measured at any 10 points on a cross section of a member for a display device in the thickness direction observed with a transmission electron microscope (TEM), a scanning electron microscope (SEM), or a scanning transmission electron microscope (STEM). Unless otherwise specified, the same can be said for the thicknesses of other layers in the member for a display device.

[0217] 5. Other configurations In addition to the above-described layers, the display device member of this embodiment may have other layers as needed. Examples of other layers include a primer layer and a fingerprint prevention layer.

[0218] (1) Primer layer 5, the display device member in this embodiment may have a primer layer 5 between the glass substrate 2 and the resin layer 3. The primer layer can improve the adhesion between the glass substrate and the resin layer.

[0219] The material for the primer layer is not particularly limited as long as it can improve the adhesion between the glass substrate and the resin layer, and examples thereof include resins. Examples of resins include (meth)acrylic resins, urethane resins, (meth)acrylic urethane copolymers, vinyl chloride-vinyl acetate copolymer resins, polyesters, butyral resins, chlorinated polypropylene, chlorinated polyethylene, epoxy resins, and silicone resins. These resins may be used alone or in combination of two or more.

[0220] The thickness of the primer layer may be any thickness that can increase the adhesion between the glass substrate and the resin layer or the second resin layer, and may be, for example, 0.1 μm or more and 10 μm or less, and preferably 0.2 μm or more and 5 μm or less.

[0221] The method for forming the primer layer may be, for example, a method of applying a primer layer composition onto a glass substrate. Examples of the application method include general application methods such as gravure coating, gravure reverse coating, gravure offset coating, spin coating, roll coating, reverse roll coating, blade coating, dip coating, screen printing, and die coating. Alternatively, a transfer method may be used to form the primer layer.

[0222] (2) Fingerprint prevention layer 5, the display device member of this embodiment may have a fingerprint-resistant layer 6 on the surface of the functional layer 4 opposite to the resin layer 3. The fingerprint-resistant layer makes it difficult for fingerprints to adhere and makes them easy to wipe off.

[0223] The material for the fingerprint prevention layer is not particularly limited as long as it is a material that can impart fingerprint resistance, and general materials for fingerprint prevention layers can be used.

[0224] The thickness of the fingerprint-preventing layer is not particularly limited as long as it exhibits fingerprint resistance.

[0225] The fingerprint prevention layer can be formed by, for example, a coating method or a vapor deposition method.

[0226] 6. Characteristics of display device components The display device member according to the present disclosure preferably has a total light transmittance of, for example, 80% or more, more preferably 85% or more, and even more preferably 88% or more. Such a high total light transmittance allows the display device member to have good transparency.

[0227] Here, the total light transmittance of the member for a display device can be measured in accordance with JIS K7361-1, for example, by using a haze meter HM150 manufactured by Murakami Color Research Laboratory.

[0228] The haze of the display device member according to the present disclosure is, for example, preferably 2.0% or less, more preferably 1.5% or less, and even more preferably 1.0% or less. Such a low haze allows the display device member to have good transparency.

[0229] The haze of the display member can be measured in accordance with JIS K-7136, for example, using a haze meter HM150 manufactured by Murakami Color Research Laboratory.

[0230] The member for a display device according to the present disclosure preferably has flex resistance. Specifically, when the member for a display device is subjected to a dynamic flex test described below, it is preferable that the member for a display device does not crack or break.

[0231] The dynamic bending test is performed as follows. As shown in FIG. 6(a), in the dynamic bending test, first, a short side 1C of a display device member 1 measuring 20 mm × 100 mm and a short side 1D opposite the short side 1C are fixed by parallel fixing portions 21. Also, as shown in FIG. 6(a), the fixing portions 21 are slidable horizontally. Next, as shown in FIG. 6(b), the fixing portions 21 are moved closer to each other to deform the display device member 1 so as to fold it. Furthermore, as shown in FIG. 6(c), the fixing portions 21 are moved to a position where the distance d between the two opposing short side portions 1C and 1D fixed by the fixing portions 21 of the display device member 1 becomes a predetermined value. Then, the fixing portions 21 are moved in the opposite direction to eliminate the deformation of the display device member 1. By moving the fixing portions 21 as shown in FIGS. 6(a) to 6(c), the display device member 1 can be folded 180°. Furthermore, by conducting a dynamic bending test so that the bent portion 1E of the display device member 1 does not protrude from the lower end of the fixing portion 21 and controlling the distance when the fixing portion 21 is closest, it is possible to set the distance d between the two opposing short side portions 1C, 1D of the display device member 1 to a predetermined value. For example, if the distance d between the two opposing short side portions 1C, 1D of the display device member 1 is 10 mm, the outer diameter of the bent portion 1E is considered to be 10 mm.

[0232] In a display device component, it is preferable that no cracks or breaks occur when a dynamic bending test is repeated 100,000 times so that the distance d between the opposing short side portions 1C and 1D of the display device component 1 is 10 mm, and it is even more preferable that no cracks or breaks occur when the test is repeated 200,000 times.

[0233] In the dynamic bending test, the display device member may be bent so that the glass substrate is on the outside, or the display device member may be bent so that the glass substrate is on the inside, but in either case, it is preferable that the display device member does not crack or break.

[0234] Furthermore, when a static bending test described below is conducted on a member for a display device, the opening angle θ of the member for a display device after the static bending test is preferably 100° or more, and more preferably 130° or more.

[0235] The static bending test is performed as follows. First, as shown in FIG. 7(a), the short side 1C of the display device member 1 and the short side 1D opposite to the short side 1C are fixed with fixing parts 22 arranged in parallel so that the distance d between the short side 1C and the short side 1D is 10 mm. Then, a static bending test is performed in which the display device member 1 is left in a folded state at 23°C for 240 hours. After the static bending test, as shown in FIG. 7(b), the fixing parts 22 are removed from the short side 1D to unfold the display device member 1, and the opening angle θ, which is the angle at which the display device member 1 naturally opens after 30 minutes at room temperature, is measured. Note that the larger the opening angle θ, the better the restorability, and the maximum opening angle is 180°.

[0236] In the static bending test, the display device member may be bent so that the glass substrate faces inward, or the display device member may be bent so that the glass substrate faces outward. In either case, the opening angle θ is preferably 100° or more, and more preferably 130° or more.

[0237] 7. Uses for display device components The display device member according to the present disclosure can be used as a member arranged on the viewer's side of the display panel in a display device. The display device member according to the present disclosure can be used in display devices used in electronic devices such as smartphones, tablet terminals, wearable terminals, personal computers, televisions, digital signage, public information displays (PIDs), and in-vehicle displays. In particular, the display device member according to the present disclosure can be preferably used in flexible displays such as foldable displays, rollable displays, and bendable displays, and is more preferably used in foldable displays.

[0238] When the member for a display device according to the present disclosure is disposed on the surface of a display device, the surface on the glass substrate side faces the display panel side, and the surface on the functional layer side faces outward.

[0239] The method for disposing the display device member of the present disclosure on the surface of the display device is not particularly limited, and examples thereof include a method using an adhesive layer, etc. As the adhesive layer, a known adhesive layer used for adhering display device members can be used.

[0240] II. Second embodiment A second embodiment of a display device component in the present disclosure is a display device component having, in this order, a glass substrate, a resin layer, a first functional layer, and a functional film, wherein the functional film has, from the first functional layer side, an adhesive layer, a base layer, and a second functional layer, wherein the thickness of the glass substrate is 100 μm or less, the average total thickness of the resin layer and the first functional layer is 10 μm or more and 60 μm or less, and the maximum total thickness of the resin layer and the first functional layer is 60 μm or less.

[0241] 8 is a schematic cross-sectional view showing an example of a display device member according to this embodiment. As shown in FIG. 8, the display device member 1 includes a glass substrate 2, a resin layer 3, a first functional layer 31, and a functional film 32, in this order. The functional film 32 includes, from the first functional layer 31 side, an adhesive layer 33, a base layer 34, and a second functional layer 35. The glass substrate 2 has a predetermined thickness. The average total thickness of the resin layer 3 and the first functional layer 31 is within a predetermined range, and the maximum total thickness T2 of the resin layer 3 and the first functional layer 31 is within a predetermined range. max is equal to or less than a predetermined value.

[0242] Here, when the resin layer 3 and the first functional layer 31 are formed on one surface of the glass substrate 2 by a coating method, the thickness of the end portions of the resin layer 3 and the first functional layer 31 increases due to surface tension, and protruding portions 11 tend to form at the end portions of the resin layer 3 and the first functional layer 31. In the example shown in FIG. 8 , the maximum value of the total thickness of the protruding portions 11 of the resin layer 3 and the first functional layer 31 is equal to the maximum value T2 of the total thickness of the resin layer 3 and the first functional layer 31. max This becomes:

[0243] The member for a display device of this embodiment can achieve the same effects as the member for a display device of the first embodiment.

[0244] Hereinafter, each configuration of the member for a display device in this embodiment will be described.

[0245] 1. Thickness of the resin layer, first functional layer, functional film, and second functional layer In this embodiment, the average total thickness of the resin layer and the first functional layer can be 10 μm or more and 60 μm or less, preferably 25 μm or more and 55 μm or less, and more preferably 30 μm or more and 50 μm or less. By keeping the average total thickness of the resin layer and the first functional layer within the above range, cracking of the glass substrate due to impact can be suppressed, improving impact resistance. Furthermore, when the display device component is bent, cracks, whitening, wrinkles, etc., can be suppressed in the resin layer and the first functional layer, improving flex resistance. On the other hand, if the average total thickness of the resin layer and the first functional layer is too small, impact resistance may be reduced. Furthermore, if the average total thickness of the resin layer and the first functional layer is too large, flex resistance may be reduced.

[0246] In this embodiment, the maximum value of the total thickness of the resin layer and the first functional layer can be the same as the maximum value of the total thickness of the resin layer and the functional layer in the first embodiment.

[0247] Here, as described above, when the resin layer and the first functional layer are formed on one surface of the glass substrate by a coating method, surface tension tends to increase the thickness of the edges of the resin layer and the first functional layer, resulting in raised portions 11 at the edges of the resin layer 3 and the first functional layer 31, as shown in FIG. 8, for example. In this case, the maximum value of the total thickness of the resin layer and the first functional layer is the maximum value of the total thickness of the raised portions of the resin layer and the first functional layer. In such a case, for example, if the resin layer and the first functional layer have a rectangular or square shape in plan view, it is sufficient that the maximum value of the total thickness of the resin layer and the first functional layer satisfies the above range at the edge of at least one of the four sides of the resin layer and the first functional layer.

[0248] In particular, for the same reasons as for the resin layer and functional layer in the first embodiment, it is preferable that the maximum total thickness of the resin layer and the first functional layer be within the above range at the ends of two opposing sides of the resin layer and the first functional layer. Furthermore, when the planar shape of the resin layer and the first functional layer is rectangular, it is preferable that the maximum total thickness of the resin layer and the first functional layer be within the above range at the ends of two opposing long sides of the resin layer and the first functional layer. Furthermore, for the reasons mentioned above, it is preferable that the maximum total thickness of the resin layer and the first functional layer be within the above range at the ends of two sides of the resin layer and the first functional layer that are approximately parallel to the bending direction of the display device member.

[0249] In particular, it is preferable that the maximum total thickness of the resin layer and the first functional layer be within the above range at all four edge portions of the resin layer and the first functional layer, thereby further improving flex resistance.

[0250] Methods for controlling the maximum value of the total thickness of the resin layer and the first functional layer to be within a predetermined range include, for example, a method of incorporating a leveling agent into the resin layer and the first functional layer, a method of forming the resin layer and the first functional layer on one side of a glass substrate to obtain a laminate and then cutting the laminate, and a method of transferring the resin layer and the first functional layer to one side of a glass substrate.

[0251] Furthermore, in this embodiment, the ratio of the maximum value of the total thickness of the resin layer and the first functional layer to the average value of the total thickness of the resin layer and the first functional layer can be the same as the ratio of the maximum value of the total thickness of the resin layer and the functional layer to the average value of the total thickness of the resin layer and the functional layer in the first embodiment described above.

[0252] The total thickness of the resin layer and the first functional layer can be measured by microscopic cross-sectional observation, which involves observing a cross section of the display device member in the thickness direction using, for example, a transmission electron microscope (TEM), a scanning electron microscope (SEM), or a scanning transmission electron microscope (STEM), and determining the total thickness of the resin layer and the first functional layer from the obtained image.

[0253] When the resin layer 3 and the first functional layer 31 have raised portions 11, for example, as shown in Fig. 8, the average total thickness of the resin layer and the first functional layer is the arithmetic mean value of the total thickness at any 10 locations in the region other than the raised portions. On the other hand, when the resin layer and the first functional layer do not have raised portions, the average total thickness of the resin layer and the first functional layer can be the arithmetic mean value of the total thickness at any 10 locations.

[0254] Furthermore, when the resin layer 3 and the first functional layer 31 have raised portions 11, as shown in Fig. 8, the maximum value of the total thickness of the resin layer and the first functional layer is the maximum value of the total thickness of the raised portions. On the other hand, when the resin layer and the first functional layer do not have raised portions, the maximum value of the total thickness of the resin layer and the first functional layer can be the maximum value of the total thickness at any 10 locations.

[0255] In this embodiment, the average thickness of the first functional layer can be the same as the average thickness of the functional layer in the first embodiment.

[0256] Furthermore, the ratio of the average thickness of the first functional layer to the average total thickness of the resin layer and the first functional layer can be the same as the ratio of the average thickness of the functional layer to the average total thickness of the resin layer and the functional layer in the first embodiment above.

[0257] Here, the method for measuring the thickness of the first functional layer can be the same as the method for measuring the total thickness of the resin layer and the first functional layer described above.

[0258] When the first functional layer 31 has a raised portion 11, the average thickness of the first functional layer is the arithmetic mean value of the thicknesses at any 10 points in the region other than the raised portion, as shown in Fig. 8. On the other hand, when the first functional layer does not have a raised portion, the average thickness of the first functional layer can be the arithmetic mean value of the thicknesses at any 10 points.

[0259] Furthermore, the average thickness of the resin layer is not particularly limited as long as it satisfies the average value of the total thickness of the resin layer and the first functional layer and the average thickness of the first functional layer, and can be the same as the average thickness of the resin layer in the first embodiment above.

[0260] Here, the method for measuring the thickness of the resin layer can be the same as the method for measuring the total thickness of the resin layer and the first functional layer described above.

[0261] When the resin layer 3 has raised portions 11 as shown in Fig. 8, the average thickness of the resin layer is the arithmetic mean value of the thicknesses at any 10 points in the region other than the raised portions. On the other hand, when the resin layer does not have raised portions, the average thickness of the resin layer can be the arithmetic mean value of the thicknesses at any 10 points.

[0262] In this embodiment, the resin layer and the first functional layer have raised portions at their ends, and the cross-sectional shape of the raised portions is approximated to a triangle. When the height of the triangle is the difference between the maximum value of the total thickness of the resin layer and the first functional layer and the average value of the total thickness of the resin layer and the first functional layer, and the length of the base of the triangle is the distance from the end of the resin layer and the first functional layer to the position where the total thickness of the raised portions of the resin layer and the first functional layer becomes the average value of the total thickness of the resin layer and the first functional layer, the area of ​​the triangle is, for example, 0.08 mm 2 Preferably, it is 0.07 mm or less. 2 It is more preferable that it is 0.06 mm or less. 2 The reason why the area of ​​the triangle is preferably within the above range is the same as the case where the cross-sectional shapes of the raised portions of the resin layer and the functional layer in the first embodiment are approximated to triangles.

[0263] In addition, the explanation for approximating the cross-sectional shape of the raised portions of the resin layer and the first functional layer to a triangle can be the same as the explanation for approximating the cross-sectional shape of the raised portions of the resin layer and the functional layer to a triangle in the first embodiment above.

[0264] In this embodiment, the average thickness of the second functional layer is preferably, for example, 5 μm or more and less than 15 μm, and more preferably 7 μm or more and 13 μm or less. The reason why the average thickness of the second functional layer is preferably in the above range is the same as the reason why the average thickness of the first functional layer is preferably in a predetermined range.

[0265] The thickness of the second functional layer can be measured in the same manner as the method for measuring the combined thickness of the resin layer and the first functional layer, and the average thickness of the second functional layer can be the arithmetic mean value of the thicknesses measured at any 10 locations.

[0266] In this embodiment, the average thickness of the functional film is, for example, preferably 20 μm or more and 150 μm or less, more preferably 35 μm or more and 135 μm or less, and even more preferably 50 μm or more and 120 μm or less. If the average thickness of the functional film is too large, the bending resistance may be reduced. If the average thickness of the functional film is too small, the thickness of the second functional layer may be relatively thin, and the properties of the second functional layer may be reduced. For example, if the second functional layer is a hard coat layer, if the thickness of the second functional layer is too thin, sufficient scratch resistance may not be obtained.

[0267] The thickness of the functional film can be measured in the same manner as the combined thickness of the resin layer and the first functional layer, and the average thickness of the functional film can be the arithmetic mean value of the thicknesses measured at any 10 points.

[0268] 2. Resin layer The resin layer in this embodiment can be the same as the resin layer in the first embodiment, and therefore a description thereof will be omitted here.

[0269] 3.First functional layer The first functional layer in this embodiment can be the same as the functional layer in the first embodiment, and therefore a description thereof will be omitted here.

[0270] 4. Functional films The functional film in this embodiment has, in order from the first functional layer side, an adhesive layer, a base layer, and a second functional layer.

[0271] (1)Second functional layer The second functional layer in this embodiment is a layer disposed on the opposite side of the substrate layer from the adhesive layer. An example of the second functional layer is a hard coat layer.

[0272] The hard coat layer can be the same as the hard coat layer constituting the functional layer in the first embodiment, and therefore a description thereof will be omitted here.

[0273] Regarding the properties of the hard coat layer, pencil hardness is measured for the functional film alone, and for the surface of the functional film on the hard coat layer side.

[0274] (2) Base material layer The substrate layer in this embodiment is a layer that supports the second functional layer.

[0275] The substrate layer has transparency. Specifically, the total light transmittance of the substrate layer is preferably 85% or more, more preferably 88% or more, and even more preferably 90% or more.

[0276] The total light transmittance of the substrate layer can be measured in accordance with JIS K7361-1, for example, using a haze meter HM150 manufactured by Murakami Color Research Laboratory Co., Ltd. The total light transmittance of other layers can be measured in the same manner.

[0277] The substrate layer may be made of, for example, a resin substrate, and specific examples thereof include resin substrates such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), aramid, polyimide, and polyamideimide.

[0278] The thickness of the substrate layer can be, for example, 20 μm or more and 120 μm or less. If the substrate layer is too thick, the bending resistance may be impaired. On the other hand, if the substrate layer is too thin, it may be difficult to handle.

[0279] (3)Adhesive layer The adhesive layer in this embodiment is a layer for bonding the functional film to the first functional layer.

[0280] The adhesive layer has transparency. Specifically, the total light transmittance of the adhesive layer is preferably 85% or more, more preferably 88% or more, and even more preferably 90% or more.

[0281] Examples of adhesives used in the adhesive layer include adhesives such as OCA (Optical Clear Adhesive) and photosensitive adhesives.

[0282] The thickness of the adhesive layer is preferably, for example, 1 μm or more and 100 μm or less. If the adhesive layer is too thick, the flex resistance may be impaired. On the other hand, if the adhesive layer is too thin, the adhesiveness may not be ensured and the adhesive layer may peel off.

[0283] 5. Glass substrate The glass substrate in this embodiment can be the same as the glass substrate in the first embodiment, and therefore a description thereof will be omitted here.

[0284] 6. Other configurations In addition to the above-described layers, the display device member of this embodiment may also have other layers, such as a primer layer, if necessary.

[0285] 9, the display device member in this embodiment may have a primer layer 5 between the glass substrate 2 and the resin layer 3. The primer layer can improve the adhesion between the glass substrate and the resin layer.

[0286] The primer layer can be the same as the primer layer in the first embodiment, and therefore a description thereof will be omitted here.

[0287] 7. Display device components The properties and uses of the member for a display device in this embodiment can be the same as those of the member for a display device in the first embodiment, and therefore a description thereof will be omitted here.

[0288] III. Third embodiment A third embodiment of the display device member of the present disclosure provides a display device member having a glass substrate, a resin layer, and a functional film in this order, and the functional film having, from the resin layer side, an adhesive layer, a substrate layer, and a functional layer in this order, wherein the thickness of the glass substrate is 100 μm or less, the average thickness of the resin layer is 10 μm or more and 60 μm or less, and the maximum thickness of the resin layer is 60 μm or less.

[0289] 10 is a schematic cross-sectional view showing an example of a display device member in this embodiment. As shown in FIG. 10, the display device member 1 has a glass substrate 2, a resin layer 3, and a functional film 32 in this order. The functional film 32 has, from the resin layer 3 side, an adhesive layer 33, a base layer 34, and a functional layer 36. The glass substrate 2 has a predetermined thickness. The average thickness of the resin layer 3 is within a predetermined range, and the maximum thickness T3 of the resin layer 3 is 1 / 2. max is equal to or less than a predetermined value.

[0290] When the resin layer 3 is formed on one surface of the glass substrate 2 by a coating method, the thickness of the end portion of the resin layer 3 increases due to surface tension, and a protruding portion 11 tends to be formed at the end portion of the resin layer 3. In the example shown in FIG. 10, the maximum thickness of the protruding portion 11 of the resin layer 3 is the maximum thickness T3 of the resin layer 3. max This becomes:

[0291] The member for a display device of this embodiment can achieve the same effects as the member for a display device of the first embodiment.

[0292] Hereinafter, each configuration of the member for a display device in this embodiment will be described.

[0293] 1. Thickness of resin layer, functional film and functional layer In this embodiment, the average thickness of the resin layer can be 10 μm or more and 60 μm or less, preferably 25 μm or more and 55 μm or less, and more preferably 30 μm or more and 50 μm or less. By having the average thickness of the resin layer within the above range, cracking of the glass substrate due to impact can be suppressed, improving impact resistance, and the occurrence of cracks, whitening, wrinkles, etc. in the resin layer when the display device member is bent can be suppressed, improving flex resistance. On the other hand, if the average thickness of the resin layer is too small, impact resistance may be reduced. Furthermore, if the average thickness of the resin layer is too large, flex resistance may be reduced.

[0294] In this embodiment, the maximum thickness of the resin layer is 60 μm or less, and preferably 55 μm or less. By having the maximum thickness of the resin layer within the above range, cracks, whitening, wrinkles, etc. can be suppressed from occurring in the resin layer when the display device member is bent, and bending resistance can be improved. On the other hand, if the maximum thickness of the resin layer is too large, bending resistance may be reduced.

[0295] Here, as described above, when a resin layer is formed on one surface of a glass substrate by a coating method, the thickness of the end portion of the resin layer increases due to surface tension, and a raised portion 11 tends to form at the end portion of the resin layer 3, as shown in FIG. 10, for example. In this case, the maximum thickness of the resin layer is the maximum thickness of the raised portion of the resin layer. In such a case, for example, when the resin layer has a rectangular or square shape in plan view, it is sufficient that the maximum thickness of the resin layer at the end portion of at least one of the four sides of the resin layer falls within the above range.

[0296] In particular, for the same reasons as for the resin layer and functional layer in the first embodiment, it is preferable that the maximum thickness of the resin layer be within the above range at the ends of two opposing sides of the resin layer. Also, when the resin layer has a rectangular shape in plan view, it is preferable that the maximum thickness of the resin layer be within the above range at the ends of two opposing long sides of the resin layer. Furthermore, for the reasons mentioned above, it is preferable that the maximum thickness of the resin layer be within the above range at the ends of two sides of the resin layer that are approximately parallel to the bending direction of the display device member.

[0297] In particular, it is preferable that the maximum thickness of the resin layer is within the above range at all of the end portions of the four sides of the resin layer, which can further improve the flex resistance.

[0298] Examples of methods for controlling the maximum thickness of the resin layer to be within a predetermined range include a method of incorporating a leveling agent into the resin layer, a method of forming a resin layer on one surface of a glass substrate to obtain a laminate and then cutting the laminate, and a method of transferring a resin layer to one surface of a glass substrate.

[0299] In this embodiment, the ratio of the maximum thickness of the resin layer to the average thickness of the resin layer is, for example, preferably 130% or less, and more preferably 125% or less. When the ratio is within the above range, cracks, whitening, wrinkles, etc. can be suppressed from occurring in the resin layer when the member for a display device is bent, and the bending resistance can be improved. On the other hand, if the ratio is too large, the bending resistance may be reduced.

[0300] The thickness of the resin layer can be measured by microscopic cross-sectional observation, which involves observing a cross section of the member for a display device in the thickness direction using, for example, a transmission electron microscope (TEM), a scanning electron microscope (SEM), or a scanning transmission electron microscope (STEM), and determining the thickness of the resin layer from the resulting image.

[0301] 10, when the resin layer 3 has raised portions 11, the average thickness of the resin layer is the arithmetic mean value of the total thickness at any 10 points in the region other than the raised portions. On the other hand, when the resin layer does not have raised portions, the average thickness of the resin layer can be the arithmetic mean value of the thickness at any 10 points.

[0302] Furthermore, when the resin layer 3 has a raised portion 11 as shown in Fig. 10, the maximum thickness of the resin layer is the maximum thickness of the raised portion 11. On the other hand, when the resin layer does not have a raised portion, the maximum thickness of the resin layer can be the maximum value of the thicknesses of any 10 points.

[0303] In this embodiment, the resin layer has a raised portion at an end portion, and the cross-sectional shape of the raised portion is approximated to a triangle. When the height of the triangle is the difference between the maximum thickness of the resin layer and the average thickness of the resin layer, and the length of the base of the triangle is the distance from the end of the resin layer to the position where the thickness of the raised portion of the resin layer becomes the average thickness of the resin layer, the area of ​​the triangle is, for example, 0.08 mm 2 Preferably, it is 0.07 mm or less. 2 It is more preferable that it is 0.06 mm or less. 2 It is more preferable that the area of ​​the triangle is within the above range. When the area of ​​the triangle is within the above range, cracks, whitening, wrinkles, etc. are prevented from occurring in the resin layer when the member for a display device is bent, and the bending resistance can be improved. On the other hand, if the area of ​​the triangle is too large, the bending resistance may be reduced.

[0304] Here, a case where the cross-sectional shape of the raised portion of the resin layer is approximated to a triangle will be described with reference to Fig. 11. As shown in Fig. 11, the cross-sectional shape of the raised portion 11 of the resin layer 3 is approximated to a triangle 15 indicated by a dashed line. The height H3 of the triangle 15 is the maximum thickness T3 of the resin layer 3. max and the average thickness T3 of the resin layer 3 ave The length D3 of the base of the triangle 15 is the difference between the average thickness T3 of the resin layer 3 and the thickness of the protruding portion 11 of the resin layer 3 from the edge of the resin layer 3.ave The distance to the position P3 where

[0305] The thickness of the protruding portion 11 of the resin layer 3 is equal to the average thickness T3 of the resin layer 3. ave At the position P3, the thickness of the protruding portion 11 of the resin layer 3 is equal to or smaller than the maximum thickness T3 of the resin layer 3. max , the average thickness T3 of the resin layer 3 changes as it gets farther from the end of the resin layer 3. ave The position is as follows:

[0306] In addition, as shown in FIG. 11, in the position from the end of the resin layer where the thickness of the protruding portion of the resin layer becomes the average thickness of the resin layer, in the protruding portion 11 of the resin layer 3, there are multiple peaks in the thickness of the resin layer 3, and the thickness of the protruding portion 11 of the resin layer 3 is the maximum thickness T3 of the resin layer 3. max , the average thickness T3 of the resin layer 3 changes as it gets farther from the end of the resin layer 3. ave When there are a plurality of positions P3, P4 where this occurs, the position P3 that is farthest from the end of the resin layer 3 among these positions P3, P4 is adopted.

[0307] In this embodiment, the average thickness of the functional layer can be the same as the average thickness of the second functional layer in the second embodiment.

[0308] In this embodiment, the average thickness of the functional film can be the same as that of the functional film in the second embodiment.

[0309] 2. Resin layer The resin layer in this embodiment can be the same as the resin layer in the first embodiment, and therefore a description thereof will be omitted here.

[0310] 3. Functional films The functional film in this embodiment has, in order from the resin layer side, an adhesive layer, a base layer, and a functional layer.

[0311] The functional layer, base layer and adhesive layer can be similar to the second functional layer, base layer and adhesive layer that constitute the functional film in the second embodiment above, so their explanation will be omitted here.

[0312] 4. Glass substrate The glass substrate in this embodiment can be the same as the glass substrate in the first embodiment, and therefore a description thereof will be omitted here.

[0313] 5. Other configurations In addition to the above-described layers, the display device member of this embodiment may also have other layers, such as a primer layer, if necessary.

[0314] 13, the display device member in this embodiment may have a primer layer 5 between the glass substrate 2 and the resin layer 3. The primer layer can improve the adhesion between the glass substrate and the resin layer.

[0315] The primer layer can be the same as the primer layer in the first embodiment, and therefore a description thereof will be omitted here.

[0316] 6. Display device components The properties and uses of the member for a display device in this embodiment can be the same as those of the member for a display device in the first embodiment, and therefore a description thereof will be omitted here.

[0317] B.Display device A display device according to the present disclosure includes a display panel and the above-described member for a display device, which is disposed on the viewer side of the display panel.

[0318] Fig. 14 is a schematic cross-sectional view showing an example of a display device according to the present disclosure. As shown in Fig. 14, a display device 40 includes a display panel 41 and a member for a display device 1 disposed on the viewer side of the display panel 41. In the display device 40, the member for a display device 1 is used as a member disposed on the surface of the display device 40, and an adhesive layer 42 is disposed between the member for a display device 1 and the display panel 41.

[0319] The member for a display device in the present disclosure can be similar to the member for a display device described above.

[0320] Examples of the display panel in the present disclosure include display panels used in display devices such as liquid crystal display devices, organic EL display devices, and LED display devices.

[0321] The display device according to the present disclosure may have a touch panel member between the display panel and the display device member.

[0322] The display device according to the present disclosure is preferably a flexible display. In particular, the display device according to the present disclosure is preferably foldable. That is, the display device according to the present disclosure is more preferably a foldable display. Since the display device according to the present disclosure includes the above-described display device member, it has excellent impact resistance and bending resistance, and is suitable as a flexible display, and further as a foldable display.

[0323] C.Electronic equipment An electronic device according to the present disclosure includes the display device described above.

[0324] The electronic devices in the present disclosure are not particularly limited as long as they are equipped with the above-mentioned display devices, and examples thereof include smartphones, tablet devices, wearable devices, personal computers, televisions, digital signage, public information displays (PIDs), and in-vehicle displays.

[0325] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any configuration that is substantially identical to the technical idea described in the claims of the present disclosure and that provides similar effects is included within the technical scope of the present disclosure. [Example]

[0326] The present disclosure will be further described below with reference to examples and comparative examples. Hereinafter, the hard coat layer formed on the resin layer will be referred to as the first hard coat layer, and the hard coat layer constituting the functional film will be referred to as the second hard coat layer.

[0327] [Comparative Example 1] (1) Formation of primer layer The components were blended to obtain the composition shown below to prepare a primer layer composition. <Primer layer composition> Bisphenol A solid epoxy resin (jER1256B40, manufactured by Mitsubishi Chemical) 28 parts by weight Bisphenol A novolac solid epoxy resin (jER157S65B80, manufactured by Mitsubishi Chemical) 5 parts by weight 2-Ethyl-4-methylimidazole (Tokyo Chemical Industry Co., Ltd.) 1 part by mass Solvent (MEK) 11 parts by mass

[0328] A chemically strengthened glass substrate having a thickness of 70 μm was prepared, and the above primer layer composition was applied to the glass substrate to a predetermined thickness, and dried at 80°C for 3 minutes and at 150°C for 60 minutes to form a primer layer having a thickness of 0.3 μm.

[0329] (2) Formation of resin layer A tetracarboxylic dianhydride represented by the following chemical formula was synthesized with reference to Synthesis Example 1 of WO 2014 / 046180.

[0330] [ka]

[0331] A 5 L separable flask was charged with a solution of dehydrated N,N-dimethylacetamide (DMAc) (1833.2 g) and 2,2'-bis(trifluoromethyl)benzidine (TFMB) (138.48 g). The temperature was controlled at 30 °C. Tetracarboxylic dianhydride (TMPBPTME) (176.70 g) represented by the above formula was gradually added so that the temperature did not rise more than 2 °C, and the mixture was stirred with a mechanical stirrer for 30 minutes. Pyromellitic dianhydride (PMDA) (64.20 g) was gradually added in several portions so that the temperature did not rise more than 2 °C, synthesizing a polyimide precursor solution (solids content 18% by mass). The molar ratio of TMPBPTME to PMDA (TMPBPTME:PMDA) used in the polyimide precursor was 90:10. The weight average molecular weight of the polyimide precursor was 75,000.

[0332] Under a nitrogen atmosphere, the above polyimide precursor solution (2162 g) was added to a 5 L separable flask, cooled to room temperature. Dehydrated N,N-dimethylacetamide (432 g) was added and stirred until homogenous. Next, catalysts pyridine (6.622 g) and acetic anhydride (213.67 g) were added and stirred at room temperature for 24 hours to synthesize a polyimide solution.

[0333] N,N-dimethylacetamide (DMAc) (2000 g) was added to the resulting polyimide solution and stirred until homogeneous. The polyimide solution was then divided into three equal parts and transferred to 5 L beakers. Isopropyl alcohol (3500 g) was slowly added to each beaker to obtain a white slurry. The slurry was transferred to a Buchner funnel and filtered. It was then washed with isopropyl alcohol (9000 g in total), followed by filtration. This process was repeated three times, and the mixture was dried at 110 °C in a vacuum dryer to obtain polyimide (polyimide powder). The weight-average molecular weight of the polyimide measured by GPC was 100,000.

[0334] N,N-dimethylacetamide (DMAc) was added to the polyimide to prepare a polyimide varnish (resin composition) containing 12% by weight of polyimide in the varnish. The viscosity of the polyimide varnish (resin composition) (solid content concentration 12% by weight) at 25°C was 15,000 cps.

[0335] The polyimide varnish (resin composition) was applied to the primer layer to a predetermined thickness, and dried at 100°C for 10 minutes, 150°C for 10 minutes, and 230°C for 30 minutes to form a resin layer with a thickness of 10 μm.

[0336] (3) Formation of the first hard coat layer The components were blended to obtain the composition shown below to prepare a curable resin composition for a hard coat layer. <Curable Resin Composition for Hard Coat Layer> 25 parts by weight of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toagosei Co., Ltd.) Dipentaerythritol EO-modified hexaacrylate (A-DPH-6E, manufactured by Shin-Nakamura Chemical Co., Ltd.) 25 parts by mass 50 parts by weight (solid equivalent) of irregular silica particles (average particle size 25 nm, manufactured by JGC Catalysts and Chemicals Co., Ltd.) 4 parts by weight of photopolymerization initiator (Irg184) Fluorine-based leveling agent (F568, manufactured by DIC Corporation) 0.2 parts by mass (solid equivalent) Ultraviolet absorber 1 (DAINSORB P6, manufactured by Daiwa Kasei) 3 parts by weight Solvent (MIBK) 150 parts by weight

[0337] The curable resin composition for hard coat layer was applied to the resin layer to a predetermined thickness, dried at 80°C for 3 minutes, and then cured by ultraviolet irradiation to form a hard coat layer with a thickness of 5 μm, thereby obtaining a member for a display device.

[0338] [Examples 1 to 8 and Comparative Examples 2 to 5] A member for a display device was produced in the same manner as in Comparative Example 1, except that the thickness of the resin layer and the thickness of the first hard coat layer were set to the thicknesses shown in Table 1 below.

[0339] [Rating 1] (1) Steel wool resistance (scratch resistance) A steel wool test was performed on the surface of the first hard coat layer side of the display device member to evaluate scratch resistance. Specifically, a display device member cut into a size of 10 cm x 5 cm was fixed to a glass plate with cellophane tape manufactured by Nichiban Co., Ltd. to prevent folds or wrinkles, and then rubbed 2,500 times back and forth at a speed of 50 mm / sec with a load of 9.8 N using #0000 steel wool (Bonstar #0000 manufactured by Nippon Steel Wool Co., Ltd.). Thereafter, the presence or absence of scratches on the surface of the display device member was visually confirmed. The evaluation criteria were as follows: A: No injuries were found. F: The injury was confirmed.

[0340] (2) Dynamic bending test A dynamic bending test was performed on the display device member to evaluate its bending resistance. Specifically, a display device member measuring 20 mm x 100 mm was first fixed to a durability testing machine (product name "DLDMLH-FS", manufactured by Yuasa System Co., Ltd.) with the short sides (20 mm) of the display device member secured by fixing parts. The minimum distance d between the two opposing short sides was adjusted to 10 mm as shown in Figure 6(c). A dynamic bending test was then performed in which the surface of the display device member was folded 180° 100,000 times. The display device member was folded so that the surface facing the first hard coat layer was facing outward and the surface facing the glass substrate was facing inward. The evaluation criteria were as follows: A: No cracks or whitening occurred in the resin layer or hard coat layer. F: Cracks or whitening occurred in the resin layer or hard coat layer.

[0341] (3) Pen drop test (impact test) An impact test was conducted on a display device component. Specifically, a 50 μm-thick optically adhesive film (OCA) and a 100 μm-thick PET film were first bonded in this order to the surface of the glass substrate of the display device component to prepare a test laminate. The test laminate was placed on a 30 mm-thick metal plate so that the PET film side of the test laminate was in contact with the metal plate. Next, a pen was dropped onto the test laminate from a test height with its tip facing downwards. A Zebra Blen 0.5BAS88-BK pen (weight 12 g, pen tip 0.5 mmφ) was used. The evaluation criteria were as follows: A: The minimum test height at which cracks appear in the glass substrate is 30 cm or more. B: The minimum test height at which cracks occurred in the glass substrate was 20 cm or more and less than 30 cm. C: The minimum test height at which the glass substrate cracked was less than 20 cm.

[0342] [Table 1]

[0343] [Examples 9 to 12 and Comparative Examples 6 to 7] A member for a display device was produced in the same manner as in Comparative Example 1, except that the thickness of the resin layer and the thickness of the first hard coat layer were set to the thicknesses shown in Table 2 below.

[0344] [Rating 2] (1) Total thickness of the resin layer and the first hard coat layer Using a stylus film thickness measuring instrument (Mitutoyo Corporation, LGK-0110-542-158), the surface of the display device component was measured with a stylus at equal intervals of 1 mm. From the obtained film thickness profile data, the average and maximum values ​​of the total thickness of the resin layer and the first hard coat layer were calculated. Furthermore, the cross-sectional shapes of the raised portions at the ends of the resin layer and the first hard coat layer were approximated to triangles, and the area of ​​the triangles was calculated. Figures 15(a) and (b) show the distribution of the total thickness of the resin layer and the first hard coat layer.

[0345] (2) Dynamic bending test As in the above Evaluation 1, a dynamic bending test was carried out to evaluate bending resistance.

[0346] (3) Pen drop test (impact test) Similar to the above evaluation 1, an impact test was performed.

[0347] [Table 2]

[0348] From Tables 1 and 2, it was confirmed that when a display device component has a glass substrate, a resin layer, and a functional layer in that order, good bending resistance and impact resistance can be achieved by setting the average value of the total thickness of the resin layer and the functional layer and the maximum value of the total thickness of the resin layer and the functional layer within a specified range.

[0349] [Comparative Example 8] (1) Preparation of hard coat film The components were blended to obtain the composition shown below to prepare a curable resin composition for a hard coat layer. <Curable Resin Composition for Hard Coat Layer> 25 parts by weight of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toagosei Co., Ltd.) Dipentaerythritol EO-modified hexaacrylate (A-DPH-6E, manufactured by Shin-Nakamura Chemical Co., Ltd.) 25 parts by mass 50 parts by weight (solid equivalent) of irregular silica particles (average particle size 25 nm, manufactured by JGC Catalysts and Chemicals Co., Ltd.) 4 parts by weight of photopolymerization initiator (Irg184) Fluorine-based leveling agent (F568, manufactured by DIC Corporation) 0.2 parts by mass (solid equivalent) Ultraviolet absorber 1 (DAINSORB P6, manufactured by Daiwa Kasei) 3 parts by weight Solvent (MIBK) 150 parts by weight

[0350] A 50 μm thick PET film (manufactured by Toyobo Co., Ltd., product name A4100) was prepared, and the above-mentioned hard coat layer curable resin composition was applied onto the PET film using a bar coater. The coating film was then dried at 100°C for 3 minutes, and then cured by irradiating with 200 mJ of ultraviolet light to form a 10 μm thick second hard coat layer. This resulted in a hard coat film.

[0351] (2) Formation of primer layer, resin layer, and first hard coat layer In Comparative Example 1, a primer layer, a resin layer, and a first hard coat layer were formed on a glass substrate in the same manner as in Comparative Example 1, except that the thicknesses of the resin layer and the first hard coat layer were set to the thicknesses shown in Table 2 below, to obtain a laminate.

[0352] (3) Fabrication of display device components Using a 50 μm thick acrylic adhesive film (manufactured by 3M, product name 8146-2), the surface of the first hard coat layer of the laminate was bonded to the surface of the PET film of the hard coat film, thereby obtaining a member for a display device.

[0353] [Examples 13 to 14 and Comparative Example 9] A member for a display device was produced in the same manner as in Comparative Example 8, except that the thickness of the resin layer and the thickness of the first hard coat layer were set to the thicknesses shown in Table 3 below.

[0354] [Comparative Example 10] A hard coat film was produced in the same manner as in Comparative Example 8. The same glass substrate as used in Comparative Example 1 was also prepared. Next, a 50 μm-thick acrylic adhesive film (manufactured by 3M, product name 8146-2) was used to bond the glass substrate to the PET film side of the hard coat film. This resulted in a display device member.

[0355] [Rating 3] (1) Total thickness of the resin layer and the first hard coat layer As in Evaluation 2 above, the average and maximum values ​​of the total thickness of the resin layer and the first hard coat layer were determined, and the cross-sectional shapes of the raised portions at the ends of the resin layer and the first hard coat layer were approximated to triangles, and the areas of the triangles were determined.

[0356] (2) Dynamic bending test As in the above Evaluation 1, a dynamic bending test was carried out to evaluate bending resistance.

[0357] (3) Pen drop test (impact test) An impact test was carried out in the same manner as in the above Evaluation 1. The evaluation criteria were as follows. AA: The minimum test height at which the glass substrate cracked was 40 cm or more. A: The minimum test height at which cracks appear in the glass substrate is 30 cm or more and less than 40 cm. B: The minimum test height at which cracks occurred in the glass substrate was 20 cm or more and less than 30 cm. C: The minimum test height at which the glass substrate cracked was less than 20 cm.

[0358] [Table 3]

[0359] From Table 3, it was confirmed that when a display device component has a glass substrate, a resin layer, a first functional layer, and a functional film in that order, and the functional film has an adhesive layer, a base layer, and a second functional layer in that order from the first functional layer side, by setting the average value of the total thickness of the resin layer and the first functional layer and the maximum value of the total thickness of the resin layer and the first functional layer within a predetermined range, it can be achieved both good flex resistance and impact resistance. Note that, since the evaluation of Comparative Example 8 in the pen drop test was equivalent to that of Comparative Example 10, it is thought that the effect of achieving both flex resistance and impact resistance was achieved by controlling the distribution of the total thickness of the resin layer and the first functional layer.

[0360] [Comparative Example 12] (1) Preparation of hard coat film In the same manner as in Comparative Example 8, a hard coat film was produced.

[0361] (2) Formation of resin layer In Comparative Example 1, a primer layer and a resin layer were formed on a glass substrate in the same manner as in Comparative Example 1, except that the first hard coat layer was not formed and the thickness of the resin layer was set to the thickness shown in Table 3 below, to obtain a laminate.

[0362] (3) Fabrication of display device components The resin layer side of the laminate and the PET film side of the hard coat film were bonded together using a 50 μm thick acrylic adhesive film (product name 8146-2, manufactured by 3M Co.), thereby obtaining a member for a display device.

[0363] [Rating 4] (1) Total thickness of the resin layer and the first hard coat layer As in the above evaluation 2, the average thickness and maximum thickness of the resin layer were determined, and further, the cross-sectional shape of the raised portion at the end of the resin layer was approximated to a triangle, and the area of ​​the triangle was determined.

[0364] (2) Dynamic bending test As in the above Evaluation 1, a dynamic bending test was carried out to evaluate bending resistance.

[0365] (3) Pen drop test (impact test) An impact test was carried out in the same manner as in the above Evaluation 1. The evaluation criteria were the same as in the above Evaluation 3.

[0366] [Table 4]

[0367] From Table 4, it was confirmed that when a display device component has a glass substrate, a resin layer, and a functional film in this order, and the functional film has an adhesive layer, a base layer, and a second functional layer in this order from the resin layer side, by setting the average thickness and maximum thickness of the resin layer within a predetermined range, it is possible to achieve both good flex resistance and impact resistance. Note that, since the evaluation of Comparative Example 11 in the pen drop test was equivalent to that of Comparative Example 10, it is thought that the effect of achieving both flex resistance and impact resistance was not achieved by controlling the thickness distribution of the resin layer. [Explanation of symbols]

[0368] 1. Display device components 2...Glass substrate 3...resin layer 4... Functional layer 5... Primer layer 6 … Anti-fingerprint layer 11... Climax 31 … 1st functional layer 32... Functional film 33…adhesive layer 34 … Base material layer 35…Second functional layer 36... Functional layer 40…Display device 41... Display panel

Claims

1. A display device member having a glass substrate, a resin layer, and a functional layer in this order, The thickness of the glass substrate is 100 μm or less, the average total thickness of the resin layer and the functional layer is 19 μm or more and 60 μm or less, and the maximum total thickness of the resin layer and the functional layer is 60 μm or less; The composite elastic modulus of the resin layer is 4.7 GPa or more and 20 GPa or less, the functional layer is a hard coat layer, a ratio of a maximum value of the total thickness of the resin layer and the functional layer to an average value of the total thickness of the resin layer and the functional layer is 132% or less; A member for a display device, wherein a maximum value of the total thickness of the resin layer and the functional layer is the total thickness at a protruding portion present at an end of the member for a display device, the resin layer and the functional layer have raised portions at their ends, A component for a display device, wherein when the cross-sectional shape of the raised portion is approximated to a triangle, the height of the triangle is the difference between the maximum value of the total thickness of the resin layer and the functional layer and the average value of the total thickness of the resin layer and the functional layer, and the length of the base of the triangle is the distance from the edge of the resin layer and the functional layer to a position where the total thickness of the raised portion of the resin layer and the functional layer becomes the average value of the total thickness of the resin layer and the functional layer, the area of ​​the triangle is 0.08 mm2 or less.

2. 2. The member for a display device according to claim 1, wherein the average thickness of the functional layer is 5 μm or more and less than 15 μm.

3. 3. The member for a display device according to claim 1, wherein a ratio of an average thickness of the functional layer to an average total thickness of the resin layer and the functional layer is 10% or more and 65% or less.

4. A display panel; a display device member according to any one of claims 1 to 3, which is disposed on a viewer side of the display panel; A display device comprising:

5. An electronic device equipped with the display device described in claim 4.

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