Antiglare sheet, sheet article, polarizing plate, display device, and antiglare article

Abstract

This antiglare sheet comprises a first surface and a second surface that face each other in a first direction. The antiglare sheet comprises an antiglare layer including a surface having recesses and protrusions. The surface having recesses and protrusions faces the opposite side from the second surface in the first direction. The ratio of image clarity C (0.125) by a transmission method using an optical comb having a width of 0.125 mm to image clarity C (2.0) by a transmission method using an optical comb having a width of 2.0 mm is 0.70 or more. The transmission haze is 15-40% inclusive.

Description

Antiglare sheet, sheet article, polarizing plate, display device, and antiglare article

[0001] The present disclosure relates to an antiglare sheet, a sheet article, a polarizing plate, a display device, and an antiglare article.

[0002] Anti-glare sheets are known, as disclosed in Patent Documents 1 to 3. Anti-glare sheets can be applied to display devices, for example. Examples of display devices include televisions, display devices incorporated in notebook PCs and desktop PCs, and display devices incorporated in smartphones and tablets. The anti-glare sheet forms the outermost surface of the display device. The anti-glare sheet imparts anti-glare properties to the display device. Anti-glare properties are a property that suppresses reflections of lighting and people and other background objects.

[0003] By strengthening the light diffusion function of the antiglare layer, the antiglare properties can be improved. However, improved antiglare properties can also lead to glare. Glare is a phenomenon in which minute variations in brightness are observed on the outermost surface of a display device. The occurrence of glare leads to deterioration of image visibility.

[0004] JP 2013-195606 A JP 2020-197728 A JP 2023-16815 A

[0005] Conventional antiglare sheets have not been able to adequately provide antiglare properties while suppressing glare. The antiglare sheet disclosed in Patent Document 1 has too low antiglare properties, resulting in reflections. The antiglare sheets disclosed in Patent Documents 2 and 3 cause glare. The present disclosure aims to provide both antiglare properties and suppress glare.

[0006] A first antiglare sheet according to one embodiment of the present disclosure is an antiglare sheet including a first surface and a second surface facing each other in a first direction, and is provided with an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, the ratio of image clarity C(0.125) measured in a transmission method using an optical comb having a width of 0.125 mm to image clarity C(2.0) measured in a transmission method using an optical comb having a width of 2.0 mm is 0.70 or more, and the transmission haze is 15% or more and 40% or less.

[0007] A second antiglare sheet according to one embodiment of the present disclosure is an antiglare sheet including a first surface and a second surface facing each other in a first direction, and is provided with an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, the ratio of image clarity C(0.125) measured in a transmission method using an optical comb having a width of 0.125 mm to image clarity C(2.0) measured in a transmission method using an optical comb having a width of 2.0 mm is 0.25 or more, the transmission haze is 15% or more and 40% or less, and the external haze is greater than 14% and 35% or less.

[0008] A third antiglare sheet according to one embodiment of the present disclosure is an antiglare sheet including a first surface and a second surface facing each other in a first direction, and is provided with an antiglare layer including a textured surface, wherein the textured surface faces the opposite side to the second surface in the first direction, and the ratio of the image clarity C(2.0) minus the image clarity C(0.125) to the average of the image clarity C(2.0) obtained by a transmission method using an optical comb having a width of 2.0 mm and the image clarity C(0.125) obtained by a transmission method using an optical comb having a width of 0.125 mm is 1.00 or less.

[0009] A fourth antiglare sheet according to one embodiment of the present disclosure is an antiglare sheet including a first surface and a second surface facing each other in a first direction, and is provided with an antiglare layer including an uneven surface, the uneven surface facing the opposite side to the second surface in the first direction, and the value obtained by subtracting the image clarity C(0.125) obtained by a transmission method using an optical comb having a width of 0.125 mm from the image clarity C(2.0) obtained by a transmission method using an optical comb having a width of 2.0 mm is 11% or less.

[0010] A fifth antiglare sheet according to an embodiment of the present disclosure is an antiglare sheet including a first surface and a second surface facing opposite to a first direction, and comprising an antiglare layer including a textured surface, wherein the textured surface faces the opposite side to the second surface in the first direction, and wherein the coefficients of variation among image clarity C(2.0) measured by a transmission method using an optical comb having a width of 2.0 mm, image clarity C(1.0) measured by a transmission method using an optical comb having a width of 1.0 mm, image clarity C(1.0) measured by a transmission method using an optical comb having a width of 0.5 mm, and image clarity C(0.125) measured by a transmission method using an optical comb having a width of 0.125 mm are 0.70 or less.

[0011] A sixth antiglare sheet according to an embodiment of the present disclosure is an antiglare sheet including a first surface and a second surface facing each other in a first direction, and is provided with an antiglare layer including a textured surface, wherein the textured surface faces the opposite side to the second surface in the first direction, and the standard deviation of the image clarity C(2.0) obtained by a transmission method using an optical comb having a width of 2.0 mm, the image clarity C(1.0) obtained by a transmission method using an optical comb having a width of 1.0 mm, the image clarity C(1.0) obtained by a transmission method using an optical comb having a width of 0.5 mm, and the image clarity C(0.125) obtained by a transmission method using an optical comb having a width of 0.125 mm is 4.9% or less.

[0012] A sheet article according to an embodiment of the present disclosure includes a plurality of antiglare sheets according to an embodiment of the present disclosure.

[0013] A polarizing plate according to an embodiment of the present disclosure includes: an antiglare sheet according to any one of the embodiments of the present disclosure; and a polarizer superimposed on the antiglare sheet.

[0014] A display device according to an embodiment of the present disclosure includes: an antiglare sheet according to any one of the embodiments of the present disclosure; and a display element superimposed on the antiglare sheet.

[0015] An anti-glare article according to one embodiment of the present disclosure includes: an article to be joined; and any one of the anti-glare sheets according to one embodiment of the present disclosure.

[0016] According to the present disclosure, the antiglare sheet can provide excellent antiglare properties and suppress glare.

[0017] FIG. 1 is a diagram for explaining one embodiment, and is a cross-sectional view showing an example of an anti-glare sheet. FIG. 2 is a cross-sectional view showing another example of an anti-glare sheet. FIG. 3 is a cross-sectional view showing yet another example of an anti-glare sheet. FIG. 4 is a perspective view showing an example of a sheet article including an anti-glare sheet. FIG. 5 is a cross-sectional view showing an example of a polarizing plate including an anti-glare sheet. FIG. 6 is a cross-sectional view showing an example of a display device including an anti-glare sheet. FIG. 7 is a cross-sectional view showing an example of an anti-glare article including an anti-glare sheet. FIG. 8 is a diagram for explaining a method for measuring glare intensity.

[0018] One embodiment of the present disclosure relates to the following <1> to <23>.

[0019] <1> An antiglare sheet including a first surface and a second surface opposing each other in a first direction, comprising an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, a ratio of image clarity C(0.125) measured in a transmission method using an optical comb having a width of 0.125 mm to image clarity C(2.0) measured in a transmission method using an optical comb having a width of 2.0 mm being 0.70 or more, and a transmission haze being 15% or more and 40% or less.

[0020] <2> The antiglare sheet according to <1>, wherein the external haze is greater than 14% and less than or equal to 35%.

[0021] <3> An antiglare sheet including a first surface and a second surface opposing each other in a first direction, comprising an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, a ratio of image clarity C(0.125) measured in a transmission method using an optical comb having a width of 0.125 mm to image clarity C(2.0) measured in a transmission method using an optical comb having a width of 2.0 mm being 0.25 or more, a transmission haze being 15% or more and 40% or less, and an external haze being greater than 14% and 35% or less.

[0022] <4> The antiglare sheet according to any one of <1> to <3>, wherein a ratio of the image clarity C(2.0) minus the image clarity C(0.125) to an average of the image clarity C(2.0) and the image clarity C(0.125) is 1.00 or less.

[0023] <5> An antiglare sheet including a first surface and a second surface opposing each other in a first direction, the antiglare sheet comprising an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, and a ratio of a value obtained by subtracting image clarity C(0.125) from image clarity C(2.0) to an average of image clarity C(2.0) measured in a transmission method using an optical comb having a width of 2.0 mm and image clarity C(0.125) measured in a transmission method using an optical comb having a width of 0.125 mm is 1.00 or less.

[0024] <6> The antiglare sheet according to any one of <1> to <5>, wherein a value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) is 11% or less.

[0025] <7> An antiglare sheet including a first surface and a second surface opposing each other in a first direction, the antiglare sheet comprising an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, and wherein a value obtained by subtracting an image clarity C(0.125) measured by a transmission method using an optical comb having a width of 0.125 mm from an image clarity C(2.0) measured by a transmission method using an optical comb having a width of 2.0 mm is 11% or less.

[0026] <8> The antiglare sheet according to any one of <1> to <7>, wherein a coefficient of variation among the image clarity C(2.0), the image clarity C(1.0) measured by a transmission method using a 1.0 mm-wide optical comb, the image clarity C(0.5) measured by a transmission method using a 0.5 mm-wide optical comb, and the image clarity C(0.125) is 0.70 or less.

[0027] <9> An antiglare sheet including a first surface and a second surface opposing each other in a first direction, the antiglare sheet comprising an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, wherein a coefficient of variation among image clarity C(2.0) measured by a transmission method using an optical comb having a width of 2.0 mm, image clarity C(1.0) measured by a transmission method using an optical comb having a width of 1.0 mm, image clarity C(1.0) measured by a transmission method using an optical comb having a width of 0.5 mm, and image clarity C(0.125) measured by a transmission method using an optical comb having a width of 0.125 mm is 0.70 or less.

[0028] <10> The antiglare sheet according to any one of <1> to <9>, wherein a standard deviation of the image clarity C(2.0), the image clarity C(1.0) measured by a transmission method using a 1.0 mm-wide optical comb, the image clarity C(1.0) measured by a transmission method using a 0.5 mm-wide optical comb, and the image clarity C(0.125) is 4.9% or less.

[0029] <11> An antiglare sheet including a first surface and a second surface opposing each other in a first direction, the antiglare sheet comprising an antiglare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, and a standard deviation of image clarity C(2.0) measured by a transmission method using an optical comb having a width of 2.0 mm, image clarity C(1.0) measured by a transmission method using an optical comb having a width of 1.0 mm, image clarity C(1.0) measured by a transmission method using an optical comb having a width of 0.5 mm, and image clarity C(0.125) measured by a transmission method using an optical comb having a width of 0.125 mm is 4.9% or less.

[0030] <12> The antiglare sheet according to any one of <1> to <11>, wherein the image clarity C(2.0) is 30% or more and 65% or less.

[0031] <13> The antiglare sheet according to any one of <1> to <12>, wherein the image clarity C(0.125) is 5% or more and 65% or less.

[0032] <14> The antiglare sheet according to any one of <1> to <13>, wherein the sum of the image clarity C(2.0), the image clarity C(1.0) measured by a transmission method using a 1.0 mm-wide optical comb, the image clarity C(1.0) measured by a transmission method using a 0.5 mm-wide optical comb, and the image clarity C(0.125) is 50% or more and 235% or less.

[0033] <15> The antiglare sheet according to any one of <1> to <14>, wherein the specular gloss Gs(20) of the first surface at an incident angle of 20° is 0.10 or more and 8.0 or less.

[0034] <16> The antiglare sheet according to any one of <1> to <15>, wherein the internal haze is 5% or less.

[0035] <17> The antiglare sheet according to any one of <1> to <16>, wherein a ratio of internal haze to transmission haze is 0.20 or less.

[0036] <18> The antiglare sheet according to any one of <1> to <17>, wherein the antiglare layer contains a binder resin and particles, and the binder resin contains a cured resin.

[0037] <19> A sheet article comprising a plurality of antiglare sheets according to any one of <1> to <18>.

[0038] <20> The sheet article according to <19>, which is wound around a winding axis.

[0039] <21> A polarizing plate comprising: the antiglare sheet according to any one of <1> to <18>; and a polarizer superimposed on the antiglare sheet.

[0040] <22> A display device comprising: the antiglare sheet according to any one of <1> to <18>; and a display element superimposed on the antiglare sheet.

[0041] <23> An antiglare article comprising: an article to be joined; and the antiglare sheet according to any one of <1> to <18> joined to the article to be joined.

[0042] In the drawings accompanying this specification, the scale and the aspect ratios of the dimensions are appropriately changed and exaggerated from those of the actual objects for the sake of convenience in illustration and understanding.

[0043] In this specification, terms such as "sheet," "film," and "plate" are not distinguished from one another solely on the basis of differences in name. For example, an "anti-glare sheet" cannot be distinguished from a member called an anti-glare film or an anti-glare plate solely on the basis of differences in name.

[0044] In this specification, the normal direction of a sheet-like (film-like, plate-like) member refers to a direction parallel to the normal or perpendicular to the plate surface of the target sheet-like (film-like, plate-like) member. The "sheet surface (film surface, plate surface)" refers to the surface that coincides with the target sheet-like (film-like, plate-like) member when the target sheet-like (film-like, plate-like) member is viewed overall and globally.

[0045] In this specification, multiple upper limit candidate values ​​and multiple lower limit candidate values ​​for a numerical range may be described in separate sentences. In this description, the numerical range may be constructed by combining any one upper limit candidate value and any one lower limit candidate value. As an example, consider the description, "Parameter B may be A1 or more, A2 or more, or A3 or more. Parameter B may be A4 or less, A5 or less, or A6 or less." In this example, the numerical range of parameter B may be A1 or more and A4 or less, A1 or more and A5 or less, A1 or more and A6 or less, A2 or more and A4 or less, A2 or more and A5 or less, A2 or more and A6 or less, A3 or more and A4 or less, A3 or more and A5 or less, or A3 or more and A6 or less.

[0046] In order to clarify the relationship between directions between the drawings, common directions are indicated in several drawings by arrows with common symbols. The tip of the arrow is the first side of each direction. The side opposite the tip of the arrow is the second side of each direction. An arrow pointing into the paper in a direction perpendicular to the paper surface of the drawing is indicated by a symbol of an x ​​in a circle, as shown in Figure 1, for example.

[0047] <<<Anti-glare sheet 10>>> As shown in Fig. 1 , the anti-glare sheet 10 according to the present embodiment includes a first surface 11 and a second surface 12. The first surface 11 and the second surface 12 face each other in a first direction D1. The anti-glare sheet 10 includes an anti-glare layer 30. The anti-glare layer 30 includes an uneven surface 31X.

[0048] The first surface 11 may include an uneven surface 11X. The uneven surface 11X may include unevenness corresponding to the unevenness of the uneven surface 31X. That is, the uneven surface 11X may include convex portions at positions facing the convex portions of the uneven surface 31X in the first direction D1. The uneven surface 11X may include concave portions at positions facing the concave portions of the uneven surface 31X in the first direction D1. The convex portions of the uneven surface 11X may be lower than the convex portions of the uneven surface 31X. The concave portions of the uneven surface 11X may be shallower than the concave portions of the uneven surface 31X.

[0049] In the example shown in Fig. 1, the first surface 11 faces the opposite side to the second surface 12 in the first direction D1. The first surface 11 faces a first side in the first direction D1. The second surface 12 faces a second side in the first direction D1. The uneven surface 31X faces the first side in the first direction D1. The uneven surface 31X faces the same side as the first surface 11 in the first direction D1. In the example shown in Fig. 1, the uneven surface 31X constitutes the first surface 11. The uneven surface 31X constitutes the uneven surface 11X.

[0050] The anti-glare sheet 10 can change the traveling direction of incident light due to the uneven surfaces 11X, 31X. The anti-glare sheet 10 may have a light diffusion function that diffuses incident light due to the uneven surfaces 11X, 31X. The anti-glare sheet 10 may reflect incident light in a direction other than the specular reflection direction due to the uneven surfaces 11X, 31X. The anti-glare sheet 10 may diffusely reflect at least a portion of incident light due to the uneven surfaces 11X, 31X. The optical action of the uneven surfaces 11X, 31X enables the anti-glare layer 30 to exhibit an anti-glare function. The optical action of the uneven surfaces 11X, 31X allows the anti-glare sheet 10 to have anti-glare properties.

[0051] The anti-glare properties of the anti-glare sheet 10 can prevent the background of the environment in which the sheet is placed, such as a lighting device, from being reflected on the sheet. By preventing the background from being reflected, the area behind the anti-glare sheet can be clearly observed. For example, when the anti-glare sheet is positioned on the image forming surface of a display element, the anti-glare sheet can prevent the reflected image from being superimposed on the image formed by the display element. Therefore, the image displayed by the display element can be clearly observed.

[0052] By strengthening the light diffusion function of the textured surface, anti-glare properties can be improved. However, improving anti-glare properties by using a textured surface makes glare more likely to occur. Glare is a phenomenon in which minute variations in brightness are observed in the anti-glare sheet. When glare occurs, the visibility of images observed through the anti-glare sheet deteriorates. Display elements have recently become increasingly high-definition. When used in combination with high-definition display elements, the problem of glare has become more pronounced.

[0053] The concave or convex portions included in the uneven surface can act as lenses to form bright spots, which may be the cause of glare.

[0054] The antiglare sheet and antiglare layer may have an internal diffusion function. In other words, the antiglare sheet and antiglare layer may have internal haze. The internal diffusion function can suppress the occurrence of bright spots due to the lens function of surface irregularities. However, when the antiglare properties of the antiglare sheet are enhanced by the internal diffusion function, the contours of images observed through the antiglare sheet become unclear. When the antiglare properties of the antiglare sheet are enhanced by the internal diffusion function, the antiglare sheet becomes cloudy. When this antiglare sheet is used in a display device, the contours of the displayed image become unclear and the image contrast decreases. These defects become more pronounced when observed from an oblique direction, i.e., from a direction significantly tilted relative to the normal direction of the antiglare sheet.

[0055] Furthermore, if the internal diffusion function of the antiglare sheet and antiglare layer is to be strengthened, the thickness of the antiglare sheet and antiglare layer will increase.

[0056] As described above, conventional antiglare sheets have not been able to effectively achieve both excellent antiglare properties and glare suppression. As will be described below, the antiglare sheet 10 according to the present embodiment is devised to achieve both excellent antiglare properties and glare suppression.

[0057] The antiglare sheet 10 according to the present embodiment has the following characteristics: (A): The transmission haze of the antiglare sheet 10 is 15% or more and 40% or less. (B): The ratio of the image clarity C(0.125) measured by a transmission method using an optical comb with a width of 0.125 mm to the image clarity C(2.0) measured by a transmission method using an optical comb with a width of 2.0 mm is 0.70 or more.

[0058] As demonstrated in the examples described below, the combination of features (A) and (B) allows the antiglare sheet 10 to have excellent antiglare properties and effectively suppress glare. By having excellent antiglare properties, the background facing the antiglare sheet 10, such as a lighting device, can be effectively prevented from being reflected in the antiglare sheet 10. In other words, the background can be effectively prevented from being observed within the antiglare sheet 10. By effectively suppressing glare, the area behind the transparent antiglare sheet 10 can be clearly seen. When the antiglare sheet 10 is used over a display element, as described below, the effects of reflection and glare are suppressed, allowing the image formed by the display element to be clearly observed.

[0059] <<Transmission Haze>> Feature (A) defines the transmission haze of the antiglare sheet 10. The transmission haze is an index of antiglare properties.

[0060] A D65 light source is used to measure the transmission haze (%). Before measuring the transmission haze of the antiglare sheet 10, the D65 light source is turned on for 15 minutes to stabilize the output of the D65 light source. When measuring the transmission haze, the angle of incidence on the measurement sample is 0°. When measuring the transmission haze of the antiglare sheet 10, the incident surface is the second surface 12 of the antiglare sheet 10. The measurement environment for measuring the transmission haze is a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The measurement sample is placed in the measurement environment for 16 hours before starting the measurement. Other measurement conditions for measuring the transmission haze are in accordance with JIS K7136:2000.

[0061] The transmission haze is the arithmetic mean value of five measurements taken at five measurement positions on the antiglare sheet to be evaluated, the five measurement positions being spaced at least 10 mm apart from each other.

[0062] In feature (A), a lower limit for the transmission haze is set. Setting a lower limit for the transmission haze can impart effective antiglare properties to the antiglare sheet 10. The transmission haze of the antiglare sheet 10 may be 15% or more, 16% or more, 20% or more, 22% or more, 24% or more, 25% or more, 26% or more, or 27% or more.

[0063] In feature (A), an upper limit for the transmission haze is set. By setting an upper limit for the transmission haze, glare can be effectively suppressed. By setting an upper limit for the transmission haze, clouding of the anti-glare sheet 10 can be suppressed. By setting an upper limit for the transmission haze, the contour of an object observed through the anti-glare sheet 10 can be made clear. The transmission haze of the anti-glare sheet 10 may be 40% or less, 35% or less, 33% or less, 32% or less, 31% or less, or 30% or less.

[0064] The transmission haze may be 15% to 40% or less, 15% to 35% or less, 15% to 33% or less, 15% to 32% or less, 15% to 31% or less, or 15% to 30% or less. The transmission haze may be 16% to 40% or less, 16% to 35% or less, 16% to 33% or less, 16% to 32% or less, 16% to 31% or less, or 16% to 30% or less. The transmission haze may be 20% to 40% or less, 20% to 35% or less, 20% to 33% or less, 20% to 32% or less, 20% to 31% or less, or 20% to 30% or less. The transmission haze may be 22% to 40% or less, 22% to 35% or less, 22% to 33% or less, 22% to 32% or less, 22% to 31% or less, or 22% to 30% or less. The transmission haze may be 24% to 40% or less, 24% to 35% or less, 24% to 33% or less, 24% to 32% or less, 24% to 31% or less, or 24% to 30% or less. The transmission haze may be 25% to 40% or less, 25% to 35% or less, 25% to 33% or less, 25% to 32% or less, 25% to 31% or less, or 25% to 30% or less. The transmission haze may be 26% to 40% or less, 26% to 35% or less, 26% to 33% or less, 26% to 32% or less, 26% to 31% or less, or 26% to 30% or less. The transmission haze may be 27% to 40% or less, 27% to 35% or less, 27% to 33% or less, 27% to 32% or less, 27% to 31% or less, or 27% to 30% or less.

[0065] <<Image clarity>> Feature (B) specifies the image clarity (%) of the antiglare sheet 10. The image clarity is measured using transmitted light. The image clarity measured by the transmission method is an index for evaluating the clarity of an image formed by transmitted light.

[0066] Image clarity using the transmission method is measured in accordance with JIS K7374:2007. Image clarity is calculated from the measured value of the amount of light transmitted through the measurement sample. The amount of light transmitted through the measurement sample is measured after passing through an optical comb. The optical comb includes a transmitting portion and a light-blocking portion. The transmitting portion and the light-blocking portion are arranged in an arrangement direction. The transmitting portion and the light-blocking portion extend elongatedly in a direction perpendicular to the arrangement direction. The "width" of the optical comb refers to the width of the light-blocking portion along the arrangement direction. The amount of light transmitted through the measurement sample is measured while moving the optical comb in the arrangement direction. The maximum light amount M and the minimum light amount m are determined from the measured value.

[0067] Image clarity C(k) is expressed by the following formula. Image clarity is the ratio of the difference between the maximum light intensity M and the minimum light intensity m to the sum of the maximum light intensity M and the minimum light intensity m. The ratio, which is image clarity, is expressed as a percentage. The unit of image clarity is %. In this specification, "image clarity C(k)" means image clarity obtained by a transmission method using an optical comb with a width of k (mm). C(k) = {(M-m) / (M+m)} x 100 [%]

[0068] Before measuring image clarity, the light source is turned on for 15 minutes to stabilize the light source output. The measurement environment for image clarity measurement is a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The measurement sample is placed in the measurement environment for 16 hours before starting the measurement.

[0069] The image clarity is the arithmetic mean value of five measurements taken at five measurement positions on the antiglare sheet to be evaluated, the five measurement positions being at least 10 mm apart from each other.

[0070] <Image clarity ratio> Feature (B) specifies the numerical range of the image clarity ratio measured using optical combs of different widths. JIS K7374:2007 specifies the widths of the optical comb as 0.125 mm, 0.25 mm, 0.5 mm, 1.0 mm, and 2.0 mm. Of these, feature (B) specifies the ratio of the image clarity C (0.125) obtained using an optical comb with a width of 0.125 mm to the image clarity C (2.0) obtained using an optical comb with a width of 2.0 mm. In other words, it specifies the ratio of the image clarity obtained using an optical comb with the smallest width specified by JIS to the image clarity obtained using an optical comb with the largest width specified by JIS.

[0071] As demonstrated in the examples, in combination with feature (A), by setting a lower limit for the ratio of image clarity C(0.125) to image clarity C(2.0) (C(0.125) / C(2.0)), it was possible to effectively improve antiglare properties and effectively suppress glare. In addition, by setting a lower limit for the ratio of image clarity C(0.125) to image clarity C(2.0), it was possible to effectively suppress the contours of objects observed through the antiglare sheet 10 from becoming unclear. Furthermore, by setting a lower limit for the ratio of image clarity C(0.125) to image clarity C(2.0), it was possible to suppress the image from becoming cloudy and the contrast from decreasing.

[0072] The ratio of image clarity C (0.125) to image clarity C (2.0) is also simply referred to as the image clarity ratio.

[0073] According to the inventors' research, conventional antiglare sheets with a transmission haze of approximately 10% to 45% had very small image clarity ratios, such as 0.55 or less. As an example, Comparative Example 5 of Patent Document 1 (JP2013-195606A), mentioned in the Background Art section, had a transmission haze of 16.0% and an image clarity ratio of 0.54. As another example, Sample 1-4, which relates to an antiglare film, in JIS K7474:2007, "Appendix (Reference) Image Clarity Measurement Examples" and "Appendix Table 1 Transmission Measurement of Plastic Films" had a transmission haze of 14.67% and an image clarity ratio of 0.16. These examples are consistent with the inventors' research results.

[0074] Note that an antiglare sheet with a transmission haze of 5% or less can have a large image clarity ratio. For example, the antiglare sheets according to Examples 1 to 8 of the aforementioned Patent Document 1 (JP2013-195606A) have a large image clarity ratio. This phenomenon is due to the fact that the image clarity of a film that does not have diffusivity is very large, regardless of the width of the optical comb.

[0075] In light of these conventional technologies, the effect of improving the antiglare properties of the antiglare sheet 10 while suppressing deterioration of visibility due to glare by setting the image clarity ratio to 0.70 or more in addition to feature (A) can be said to be unique and goes beyond the range predicted from the state of the art.

[0076] The details of the mechanism by which setting a lower limit for the image clarity ratio in addition to feature (A) allows both improved antiglare properties and reduced glare to be achieved are unknown. The following is presumed to be one factor in obtaining this unique effect, but the present disclosure is not bound by the following presumption.

[0077] In a conventional anti-glare sheet having sufficient anti-glare properties, the light-shielding portions of the optical combs having a width of 2.0 mm are able to block the light diffused by the anti-glare sheet 10. In a conventional anti-glare sheet, the light-shielding portions of the optical combs having a width of 0.125 mm are unable to block the light diffused by the anti-glare sheet 10. It is presumed that this is why the image clarity ratio of the conventional anti-glare sheet was significantly low.

[0078] In the anti-glare sheet 10 according to the present embodiment, the image clarity C (0.125) using an optical comb with a width of 0.125 mm is increased to the same extent as the image clarity C (2.0) using an optical comb with a width of 2.0 mm. In other words, the light-shielding portion of the optical comb with a width of 0.125 mm can also block the light diffused by the anti-glare sheet 10. For this reason, it is presumed that the anti-glare sheet 10 having the combination of feature (A) and feature (B) is endowed with a denser and more uniform light diffusion function than conventional anti-glare sheets.

[0079] This dense and uniform light diffusion can diffuse and reflect light to an extent that the background is sufficiently prevented from being reflected on the anti-glare sheet 10. This dense and uniform light diffusion can make bright spots caused by the lens effect less noticeable, thereby effectively suppressing glare. In addition, such dense and uniform light diffusion can avoid excessive light diffusion. Therefore, it is possible to effectively prevent the contours of objects observed through the anti-glare sheet 10 from becoming unclear. Furthermore, it is possible to effectively prevent the anti-glare sheet 10 from becoming cloudy and the contrast of objects observed through the anti-glare sheet 10 from decreasing. As described above, it is presumed that the dense and uniform light diffusion can achieve both improved anti-glare properties and suppression of reduced visibility due to glare, etc.

[0080] According to the inventors' investigations, in conventional antiglare sheets having a transmission haze of approximately 10% to 45%, the image clarity obtained using optical combs with widths of 0.25 mm, 0.5 mm, and 1.0 mm was significantly lower than image clarity C (2.0) and significantly higher than image clarity C (0.125). On the other hand, in the antiglare sheet 10 having a combination of features (A) and (B), the image clarity obtained using optical combs with widths of 0.25 mm, 0.5 mm, and 1.0 mm was similarly high as image clarity C (0.125). In the antiglare sheet 10 having a combination of features (A) and (B), the image clarity obtained using optical combs with widths of 0.25 mm, 0.5 mm, and 1.0 mm was close to image clarity C (2.0). This phenomenon is consistent with the above speculation.

[0081] In combination with feature (A), by setting a lower limit for the ratio of image clarity C(0.125) to image clarity C(2.0), it is possible to effectively improve antiglare properties while effectively suppressing glare. This image clarity ratio (C(0.125) / C(2.0)) may be 0.70 or more, 0.75 or more, 0.80 or more, 0.85 or more, 0.88 or more, 0.90 or more, 0.91 or more, 0.92 or more, 0.93 or more, 0.94 or more, or 0.95 or more.

[0082] Generally, as the width of the optical comb increases, the image clarity value also increases. Therefore, the image clarity ratio (C(0.125) / C(2.0)) may be 1.0 or less, or may be less than 1.0. From the viewpoint of imparting sufficient antiglare properties to the antiglare sheet 10, the image clarity ratio (C(0.125) / C(2.0)) may be 0.98 or less, 0.97 or less, or 0.96 or less.

[0083] The image clarity ratio may be 0.70 or more and 1.0 or less, 0.75 or more and 1.0 or less, 0.80 or more and 1.0 or less, 0.85 or more and 1.0 or less, 0.88 or more and 1.0 or less, 0.90 or more and 1.0 or less, 0.91 or more and 1.0 or less, 0.92 or more and 1.0 or less, 0.93 or more and 1.0 or less, 0.94 or more and 1.0 or less, or 0.95 or more and 1.0 or less. The image clarity ratio may be 0.70 or more and less than 1.0, 0.75 or more and less than 1.0, 0.80 or more and less than 1.0, 0.85 or more and less than 1.0, 0.88 or more and less than 1.0, 0.90 or more and less than 1.0, 0.91 or more and less than 1.0, 0.92 or more and less than 1.0, 0.93 or more and less than 1.0, 0.94 or more and less than 1.0, or 0.95 or more and less than 1.0. The image clarity ratio may be 0.70 or more and 0.98 or less, 0.75 or more and 0.98 or less, 0.80 or more and 0.98 or less, 0.85 or more and 0.98 or less, 0.88 or more and 0.98 or less, 0.90 or more and 0.98 or less, 0.91 or more and 0.98 or less, 0.92 or more and 0.98 or less, 0.93 or more and 0.94 or more and 0.98 or less, or 0.95 or more and 0.98 or less. The image clarity ratio may be 0.70 or more and 0.97 or less, 0.75 or more and 0.97 or less, 0.80 or more and 0.97 or less, 0.85 or more and 0.97 or less, 0.88 or more and 0.97 or less, 0.90 or more and 0.97 or less, 0.91 or more and 0.97 or less, 0.92 or more and 0.97 or less, 0.93 or more and 0.97 or less, 0.94 or more and 0.97 or less, or 0.95 or more and 0.97 or less. The image clarity ratio may be 0.70 or more and 0.96 or less, 0.75 or more and 0.96 or less, 0.80 or more and 0.96 or less, 0.85 or more and 0.96 or less, 0.88 or more and 0.96 or less, 0.90 or more and 0.96 or less, 0.91 or more and 0.96 or less, 0.92 or more and 0.96 or less, 0.93 or more and 0.96 or less, 0.94 or more and 0.96 or less, or 0.95 or more and 0.96 or less.

[0084] <Image clarity difference> The antiglare sheet 10 may have feature (C) in addition to or instead of feature (B). (C): The value obtained by subtracting the image clarity C (0.125) of the antiglare sheet 10 measured by a transmission method from the image clarity C (2.0) of the antiglare sheet 10 measured by a transmission method is 11% or less.

[0085] The value specified by feature (C) is "CL2.0-CL0.125." The anti-glare sheet 10 having features (A) and (C) has excellent anti-glare properties and can effectively suppress glare. Furthermore, the anti-glare sheet 10 having features (A) and (C) can effectively prevent the contours of an object observed through the anti-glare sheet 10 from becoming unclear. Furthermore, the anti-glare sheet 10 having features (A) and (C) can effectively prevent the anti-glare sheet 10 from becoming cloudy and the contrast of an object observed through the anti-glare sheet 10 from decreasing.

[0086] The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) is an index for achieving both improved anti-glare properties and suppression of reduced visibility due to glare, etc., similar to the image clarity ratio defined in feature (B). By setting an upper limit to the value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0), it is possible to achieve both improved anti-glare properties and suppression of reduced visibility due to glare, etc. The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 11% or less, 10% or less, 8.0% or less, 6.4% or less, 6.0% or less, 5.0% or less, 4.7% or less, or 4.1% or less.

[0087] The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 0% or more, or may be greater than 0%. From the viewpoint of imparting sufficient antiglare properties to the antiglare sheet 10, the value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 0.90% or more, 1.0% or more, 1.2% or more, 2.0% or more, or 2.2% or more.

[0088] The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 11% or less, 0.90% or more and 10% or less, 0.90% or more and 8.0% or less, 0.90% or more and 6.4% or less, 0.90% or more and 6.0% or less, 0.90% or more and 5.0% or less, 0.90% or more and 4.7% or less, or 0.90% or more and 4.1% or less. The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 1.0% or more and 11% or less, 1.0% or more and 10% or less, 1.0% or more and 8.0% or less, 1.0% or more and 6.4% or less, 1.0% or more and 6.0% or less, 1.0% or more and 5.0% or less, 1.0% or more and 4.7% or less, or 1.0% or more and 4.1% or less. The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 1.2% or more and 11% or less, 1.2% or more and 10% or less, 1.2% or more and 8.0% or less, 1.2% or more and 6.4% or less, 1.2% or more and 6.0% or less, 1.2% or more and 5.0% or less, 1.2% or more and 4.7% or less, or 1.2% or more and 4.1% or less. The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 2.0% or more and 11% or less, 2.0% or more and 10% or less, 2.0% or more and 8.0% or less, 2.0% or more and 6.4% or less, 2.0% or more and 6.0% or less, 2.0% or more and 5.0% or less, 2.0% or more and 4.7% or less, or 2.0% or more and 4.1% or less. The value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) may be 2.2% or more and 11% or less, 2.2% or more and 10% or less, 2.2% or more and 8.0% or less, 2.2% or more and 6.4% or less, 2.2% or more and 6.0% or less, 2.2% or more and 5.0% or less, 2.2% or more and 4.7% or less, or 2.2% or more and 4.1% or less.

[0089] <Ratio of Image Clarity Difference to Average Image Clarity> The antiglare sheet 10 may have feature (D) in addition to or instead of feature (B). (D): The ratio of the difference in image clarity C(2.0) to the average of the image clarity C(2.0) and the image clarity C(0.125) measured by the transmission method of the antiglare sheet 10 is 1.00 or less.

[0090] The ratio defined by feature (D) is "(CL2.0 - CL0.125) / ((CL2.0 + CL0.125) / 2)." The anti-glare sheet 10 having features (A) and (D) has excellent anti-glare properties and can effectively suppress glare. Furthermore, the anti-glare sheet 10 having features (A) and (D) can effectively prevent the contours of an object observed through the anti-glare sheet 10 from becoming unclear. Furthermore, the anti-glare sheet 10 having features (A) and (D) can effectively prevent the anti-glare sheet 10 from becoming cloudy and the contrast of an object observed through the anti-glare sheet 10 from decreasing.

[0091] The ratio of the value obtained by subtracting image clarity C(0.125) from image clarity C(2.0) to the average of image clarity C(2.0) and image clarity C(0.125) is an index for achieving both improved anti-glare properties and suppression of reduced visibility due to glare, etc., similar to the image clarity ratio defined in feature (B) and the difference defined in feature (C). The ratio defined in feature (D) can be said to be an index that non-dimensionalizes the difference defined in feature (C). The ratio defined in feature (D) allows the anti-glare properties and visibility of the anti-glare sheet 10 to be evaluated stably and with high accuracy.

[0092] By setting an upper limit to the ratio of the value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) to the average of the image clarity C(2.0) and the image clarity C(0.125), it is possible to achieve both improved antiglare properties and suppression of deterioration in visibility due to glare, etc. The ratio of the value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) to the average of the image clarity C(2.0) and the image clarity C(0.125) may be 1.00 or less, 0.71 or less, 0.28 or less, 0.20 or less, 0.16 or less, 0.13 or less, 0.10 or less, 0.095 or less, or 0.094 or less.

[0093] The ratio of the value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) to the average of the image clarity C(2.0) and the image clarity C(0.125) may be equal to or greater than 0. From the viewpoint of imparting sufficient antiglare properties to the antiglare sheet 10, the ratio of the value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) to the average of the image clarity C(2.0) and the image clarity C(0.125) may be equal to or greater than 0.010 or may be equal to or greater than 0.018.

[0094] This ratio may be greater than or equal to 0 and less than 1.00, greater than or equal to 0.71, greater than or equal to 0.28, greater than or equal to 0.20, greater than or equal to 0.16, greater than or equal to 0.13, greater than or equal to 0.10, greater than or equal to 0.095, or greater than or equal to 0.094. This ratio may be greater than or equal to 0 and less than 1.00, greater than or equal to 0.71, greater than or equal to 0.28, greater than or equal to 0.20, greater than or equal to 0.16, greater than or equal to 0.13, greater than or equal to 0.10, greater than or equal to 0.095, or greater than or equal to 0.094. This ratio may be 0.010 or greater and 1.00 or less, 0.010 or greater and 0.71 or less, 0.010 or greater and 0.28 or less, 0.010 or greater and 0.20 or less, 0.010 or greater and 0.16 or less, 0.010 or greater and 0.13 or less, 0.010 or greater and 0.10 or less, 0.010 or greater and 0.095 or less, or 0.010 or greater and 0.094 or less. This ratio may be 0.18 or greater and 1.00 or less, 0.18 or greater and 0.71 or less, 0.018 or greater and 0.28 or less, 0.018 or greater and 0.20 or less, 0.018 or greater and 0.16 or less, 0.018 or greater and 0.13 or less, 0.018 or greater and 0.10 or less, 0.018 or greater and 0.095 or less, or 0.018 or greater and 0.094 or less.

[0095] <Standard Deviation SD of Image Clarity> The antiglare sheet 10 may have characteristic (E) in addition to or instead of characteristic (B). (E): The standard deviation SD of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125) is 4.9% or less.

[0096] "Image clarity C (1.0)" is the image clarity of the antiglare sheet 10 measured by a transmission method using an optical comb with a width of 1.0 mm. "Image clarity C (0.5)" is the image clarity of the antiglare sheet 10 measured by a transmission method using an optical comb with a width of 0.5 mm.

[0097] The antiglare sheet 10 having the features (A) and (E) has excellent antiglare properties and can effectively suppress glare. Furthermore, the antiglare sheet 10 having the features (A) and (E) can effectively prevent the contours of an object observed through the antiglare sheet 10 from becoming unclear. Furthermore, the antiglare sheet 10 having the features (A) and (E) can effectively prevent the antiglare sheet 10 from becoming cloudy and the contrast of an object observed through the antiglare sheet 10 from decreasing.

[0098] The standard deviation SD of the image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125), like the image clarity ratio defined in feature (B), is an index for achieving both improved anti-glare properties and suppression of reduced visibility due to glare and the like. By setting upper limits on the standard deviation SD of the image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125), both improved anti-glare properties and suppression of reduced visibility due to glare and the like can be achieved. This standard deviation SD may be 4.9% or less, 4.0% or less, 3.0% or less, 2.5% or less, 2.2% or less, 2.1% or less, or 2.0% or less.

[0099] The standard deviation SD of the image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125) may be 0% or more, or may be greater than 0%. From the viewpoint of imparting sufficient antiglare properties to the antiglare sheet 10, this standard deviation SD may be 0.2% or more, 0.5% or more, or 0.8% or more.

[0100] This standard deviation SD may be 0% or more and 4.9% or less, 0% or more and 4.0% or less, 0% or more and 3.0% or less, 0% or more and 2.5% or less, 0% or more and 2.2% or less, 0% or more and 2.1% or less, or 0% or more and 2.0% or less. This standard deviation SD may be 0% or more and 4.9% or less, 0% or more and 4.0% or less, 0% or more and 3.0% or less, 0% or more and 2.5% or less, 0% or more and 2.2% or less, 0% or more and 2.1% or less, or 0% or more and 2.0% or less. The standard deviation SD may be 0.2% to 4.9%, 0.2% to 4.0%, 0.2% to 3.0%, 0.2% to 2.5%, 0.2% to 2.2%, 0.2% to 2.1%, or 0.2% to 2.0%. The standard deviation SD may be 0.5% to 4.9%, 0.5% to 4.0%, 0.5% to 3.0%, 0.5% to 2.5%, 0.5% to 2.2%, 0.5% to 2.1%, or 0.5% to 2.0%. This standard deviation SD may be 0.8% or more and 4.9% or less, 0.8% or more and 4.0% or less, 0.8% or more and 3.0% or less, 0.8% or more and 2.5% or less, 0.8% or more and 2.2% or less, 0.8% or more and 2.1% or less, or 0.8% or more and 2.0% or less.

[0101] <Coefficient of Variation CV of Image Clarity> The antiglare sheet 10 may have characteristic (F) in addition to or instead of characteristic (B). (F): The coefficient of variation CV of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125) is 0.70 or less.

[0102] The coefficient of variation CV defined by feature (F) is calculated by dividing the standard deviation SD of the image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125) by the average of the image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125). An anti-glare sheet 10 having features (A) and (F) has excellent anti-glare properties and can effectively suppress glare. Furthermore, an anti-glare sheet 10 having features (A) and (F) can effectively suppress the contours of an object observed through the anti-glare sheet 10 from becoming unclear. Furthermore, an anti-glare sheet 10 having features (A) and (F) can effectively suppress the anti-glare sheet 10 from becoming cloudy and the contrast of an object observed through the anti-glare sheet 10 from decreasing.

[0103] The coefficient of variation CV of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125) is an index for achieving both improved anti-glare properties and suppression of reduced visibility due to glare, etc., similar to the image clarity ratio defined in feature (B) and the standard deviation SD defined in feature (E). The coefficient of variation CV defined in feature (F) can be said to be an index that non-dimensionalizes the standard deviation SD defined in feature (E). The ratio defined in feature (F) can also be used to stably evaluate the anti-glare properties and visibility of the anti-glare sheet 10. By setting upper limits to the coefficients of variation CV of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125), it is possible to achieve both improved anti-glare properties and suppression of reduced visibility due to glare, etc. The coefficient of variation CV may be 0.70 or less, 0.51 or less, 0.39 or less, 0.13 or less, 0.10 or less, 0.08 or less, 0.07 or less, 0.06 or less, or 0.05 or less.

[0104] The coefficient of variation CV of the image clarity C(2.0), the image clarity C(1.0), the image clarity C(0.5), and the image clarity C(0.125) may be 0 or greater, or may be greater than 0. From the viewpoint of imparting sufficient antiglare properties to the antiglare sheet 10, this coefficient of variation CV may be 0.01 or greater, or may be 0.02 or greater.

[0105] The coefficient of variation CV may be 0 to 0.70, 0 to 0.51, 0 to 0.39, 0 to 0.13, 0 to 0.10, 0 to 0.08, 0 to 0.07, 0 to 0.06, or 0 to 0.05. The coefficient of variation CV may be 0 to 0.70, 0 to 0.51, 0 to 0.39, 0 to 0.13, 0 to 0.10, 0 to 0.08, 0 to 0.07, 0 to 0.06, or 0 to 0.05. The coefficient of variation CV may be 0.01 or more and 0.70 or less, 0.01 or more and 0.51 or less, 0.01 or more and 0.39 or less, 0.01 or more and 0.13 or less, 0.01 or more and 0.10 or less, 0.01 or more and 0.08 or less, 0.01 or more and 0.07 or less, 0.01 or more and 0.06 or less, or 0.01 or more and 0.05 or less. The coefficient of variation CV may be 0.02 or more and 0.70 or less, 0.02 or more and 0.51 or less, 0.02 or more and 0.39 or less, 0.02 or more and 0.13 or less, 0.02 or more and 0.10 or less, 0.02 or more and 0.08 or less, 0.02 or more and 0.07 or less, 0.02 or more and 0.06 or less, or 0.02 or more and 0.05 or less.

[0106] <Total Value of Image Clarity> The antiglare sheet 10 according to the present embodiment may have the following characteristic (G): Characteristic (G): The sum of the image clarity C(2.0), the image clarity C(1.0), the image clarity C(0.5), and the image clarity C(0.125) is 50% or more and 235% or less.

[0107] The total value of image clarity measured by the transmission method defined in feature (G) serves as an index for evaluating the clarity of an image formed by transmitted light. A lower limit may be set for the total value of image clarity defined in feature (G). By setting a lower limit for the total value of image clarity defined in feature (G), the contour of an object observed through the antiglare sheet 10 can be made clear. By setting a lower limit for the total value of image clarity defined in feature (G), clouding of the antiglare sheet 10 can be suppressed, thereby improving the contrast of an object observed through the antiglare sheet 10. The total value of image clarity defined in feature (G) may be 50% or more, 72% or more, 81% or more, 135% or more, 146% or more, 150% or more, 153% or more, 155% or more, 159% or more, 160% or more, or 165% or more.

[0108] An upper limit may be set for the total value of image clarity measured by the transmission method defined in feature (G). By setting an upper limit for the total value of image clarity measured by the transmission method defined in feature (G), antiglare properties can be ensured. The total value of image clarity measured by the transmission method defined in feature (G) may be 235% or less, 219% or less, 210% or less, 200% or less, or 192% or less.

[0109] The total value of this image clarity may be 50% or more and 235% or less, 72% or more and 235% or less, 81% or more and 235% or less, 135% or more and 235% or less, 146% or more and 235% or less, 150% or more and 235% or less, 153% or more and 235% or less, 155% or more and 235% or less, 159% or more and 235% or less, 160% or more and 235% or less, or 165% or more and 235% or less. The total value of this image clarity may be 50% or more and 219% or less, 72% or more and 219% or less, 81% or more and 219% or less, 135% or more and 219% or less, 146% or more and 219% or less, 150% or more and 219% or less, 153% or more and 219% or less, 155% or more and 219% or less, 159% or more and 219% or less, 160% or more and 219% or less, or 165% or more and 219% or less. The total value of this image clarity may be 50% or more and 210% or less, 72% or more and 210% or less, 81% or more and 210% or less, 135% or more and 210% or less, 146% or more and 210% or less, 150% or more and 210% or less, 153% or more and 210% or less, 155% or more and 210% or less, 159% or more and 210% or less, 160% or more and 210% or less, or 165% or more and 210% or less. The total value of this image clarity may be 50% or more and 200% or less, 72% or more and 200% or less, 81% or more and 200% or less, 135% or more and 200% or less, 146% or more and 200% or less, 150% or more and 200% or less, 153% or more and 200% or less, 155% or more and 200% or less, 159% or more and 200% or less, 160% or more and 200% or less, or 165% or more and 200% or less. The total value of this image clarity may be 50% or more and 192% or less, 72% or more and 192% or less, 81% or more and 192% or less, 135% or more and 192% or less, 146% or more and 192% or less, 150% or more and 192% or less, 153% or more and 192% or less, 155% or more and 192% or less, 159% or more and 192% or less, 160% or more and 192% or less, or 165% or more and 192% or less.

[0110] <Image clarity C (2.0)> A lower limit may be set for image clarity C (2.0). By setting a lower limit for image clarity C (2.0), glare can be suppressed. By setting a lower limit for image clarity C (2.0), the contour of an object observed through the antiglare sheet 10 can be made clear. By setting a lower limit for image clarity C (2.0), clouding of the antiglare sheet 10 can be suppressed, and the contrast of an object observed through the antiglare sheet 10 can be improved. Image clarity C (2.0) may be 30% or more, 35% or more, 40% or more, 41% or more, 42% or more, or 44% or more.

[0111] An upper limit may be set for the image clarity C(2.0). By setting an upper limit for the image clarity C(2.0), antiglare properties can be ensured. The image clarity C(2.0) may be 65% or less, 60% or less, 57% or less, 55% or less, or 51% or less.

[0112] The image clarity C(2.0) may be 30% to 65% or less, 35% to 65%, 40% to 65%, 41% to 65%, 42% to 65%, or 44% to 65%. The image clarity C(2.0) may be 30% to 60%, 35% to 60%, 40% to 60%, 41% to 60%, 42% to 60%, or 44% to 60%. The image clarity C(2.0) may be 30% to 57%, 35% to 57%, 40% to 57%, 41% to 57%, 42% to 57%, or 44% to 57%. The image clarity C(2.0) may be 30% or more and 55% or less, 35% or more and 55% or less, 40% or more and 55% or less, 41% or more and 55% or less, 42% or more and 55% or less, or 44% or more and 55% or less.

[0113] By setting the image clarity C (2.0) within the above-mentioned range, improved anti-glare properties, suppression of glare, and suppression of cloudiness can all be achieved. When the image clarity C (2.0) is within the above-mentioned range, the anti-glare sheet has excellent anti-glare properties. As a result, the image clarity of the anti-glare sheet usually varies depending on the width of the optical comb. On the other hand, by adjusting the image clarity C (2.0) of the anti-glare sheet 10 that satisfies features (A) and (B) within the above-mentioned range, excellent anti-glare properties are ensured through dense and uniform light diffusion. An anti-glare sheet 10 that has features (A) and (B) and whose image clarity C (2.0) is adjusted to the above-mentioned range can significantly improve anti-glare properties and significantly suppress deterioration of visibility due to glare, etc.

[0114] <Image clarity C(1.0)> A lower limit may be set for image clarity C(1.0). By setting a lower limit for image clarity C(1.0), the contour of an object observed through the antiglare sheet 10 can be made clear. By setting a lower limit for image clarity C(1.0), it is possible to suppress the antiglare sheet 10 from becoming cloudy, thereby improving the contrast of an object observed through the antiglare sheet 10. Image clarity C(1.0) may be 30% or more, 35% or more, 36% or more, 37% or more, 39% or more, or 40% or more.

[0115] An upper limit may be set for the image clarity C(1.0). By setting an upper limit for the image clarity C(1.0), antiglare properties can be ensured. The image clarity C(1.0) may be 65% or less, 60% or less, 54% or less, or 47% or less.

[0116] The image clarity C(1.0) may be 30% to 65% or less, 35% to 65% or less, 36% to 65% or less, 37% to 65% or less, 39% to 65% or less, or 40% to 65% or less. The image clarity C(1.0) may be 30% to 60% or less, 35% to 60% or less, 36% to 60% or less, 37% to 60% or less, 39% to 60% or less, or 40% to 60% or less. The image clarity C(1.0) may be 30% to 54% or less, 35% to 54% or less, 36% to 54% or less, 37% to 54% or less, 39% to 54% or less, or 40% to 54% or less. The image clarity C(1.0) may be 30% or more and 47% or less, 35% or more and 47% or less, 36% or more and 47% or less, 37% or more and 47% or less, 39% or more and 47% or less, or 40% or more and 47% or less.

[0117] <Image clarity C(0.5)> A lower limit may be set for image clarity C(0.5). By setting a lower limit for image clarity C(0.5), the contour of the object observed through the antiglare sheet 10 can be made clear. By setting a lower limit for image clarity C(0.5), it is possible to suppress the antiglare sheet 10 from becoming cloudy, thereby improving the contrast of the object observed through the antiglare sheet 10. Image clarity C(0.5) may be 30% or more, 32% or more, 35% or more, 37% or more, 38% or more, or 40% or more.

[0118] An upper limit may be set for the image clarity C(0.5). By setting an upper limit for the image clarity C(0.5), antiglare properties can be ensured. The image clarity C(0.5) may be 65% or less, 60% or less, 54% or less, or 47% or less.

[0119] The image clarity C(0.5) may be 30% to 65% or less, 32% to 65% or less, 35% to 65% or less, 37% to 65% or less, 38% to 65% or less, or 40% to 65% or less. The image clarity C(0.5) may be 30% to 60% or less, 32% to 60% or less, 35% to 60% or less, 37% to 60% or less, 38% to 60% or less, or 40% to 60% or less. The image clarity C(0.5) may be 30% to 54% or less, 32% to 54% or less, 35% to 54% or less, 37% to 54% or less, 38% to 54% or less, or 40% to 54% or less. The image clarity C(0.5) may be 30% or more and 47% or less, 32% or more and 47% or less, 35% or more and 47% or less, 37% or more and 47% or less, 38% or more and 47% or less, or 40% or more and 47% or less.

[0120] <Image clarity C (0.125)> A lower limit may be set for image clarity C (0.125). By setting a lower limit for image clarity C (0.1125), glare can be suppressed. By setting a lower limit for image clarity C (0.125), the contour of an object observed through the antiglare sheet 10 can be made clear. By setting a lower limit for image clarity C (0.125), clouding of the antiglare sheet 10 can be suppressed, thereby improving the contrast of an object observed through the antiglare sheet 10. Image clarity C (0.125) may be 5% or more, 11% or more, 16% or more, 30% or more, 34% or more, 35% or more, 38% or more, 40% or more, or 41% or more.

[0121] An upper limit may be set for the image clarity C(0.125). By setting an upper limit for the image clarity C(0.125), antiglare properties can be ensured. The image clarity C(0.125) may be 65% or less, 60% or less, 55% or less, 50% or less, 48% or less, or 47% or less.

[0122] The clarity of image C(0.125) may be 5% or more, 11% to 65% or less, 16% to 65% or less, 30% to 65% or less, 34% to 65% or less, 35% to 65% or less, 38% to 65% or less, 40% to 65% or less, or 41% to 65% or less. The clarity of image C(0.125) may be 5% or more, 11% to 60% or less, 16% to 60% or less, 30% to 60% or less, 34% to 60% or less, 35% to 60% or less, 38% to 60% or less, 40% to 60% or less, or 41% to 60% or less. The clarity of image C(0.125) may be 5% or more, 11% to 55% or less, 16% to 55% or less, 30% to 55% or less, 34% to 55% or less, 35% to 55% or less, 38% to 55% or less, 40% to 55% or less, or 41% to 55% or less. The clarity of image C(0.125) may be 5% or more, 11% to 50% or less, 16% to 50% or less, 30% to 50% or less, 34% to 50% or less, 35% to 50% or less, 38% to 50% or less, 40% to 50% or less, or 41% to 50% or less. The clarity of image C(0.125) may be 5% or more, 11% to 48% or less, 16% to 48% or less, 30% to 48% or less, 34% to 48% or less, 35% to 48% or less, 38% to 48% or less, 40% to 48% or less, or 41% to 48% or less.The clarity of image C(0.125) may be 5% or more, 11% to 47% or less, 16% to 47% or less, 30% to 47% or less, 34% to 47% or less, 35% to 47% or less, 38% to 47% or less, 40% to 47% or less, or 41% to 47% or less.

[0123] By setting the image clarity C (0.125) within the above-mentioned range, improved anti-glare properties, suppression of glare, and suppression of cloudiness can all be achieved. When the image clarity C (0.125) is within the above-mentioned range, the anti-glare sheet has excellent anti-glare properties. As a result, the image clarity of the anti-glare sheet typically varies depending on the width of the optical comb. On the other hand, by adjusting the image clarity C (0.125) of the anti-glare sheet 10 that satisfies features (A) and (B) within the above-mentioned range, excellent anti-glare properties are ensured through dense and uniform light diffusion. An anti-glare sheet 10 that has features (A) and (B) and whose image clarity C (0.125) is adjusted to the above-mentioned range can significantly improve anti-glare properties and significantly suppress deterioration of visibility due to glare, etc.

[0124] <<Glare Degree>> The degree of glare can be quantitatively evaluated by calculating the glare degree. The glare degree is the standard deviation of the gradation indicating the brightness of pixels in image data obtained by capturing an image of the first surface 11 of the antiglare sheet 10. When investigating the gradation indicating the brightness of pixels, the antiglare sheet 10 is attached to the image forming surface 75a of the display element 75. A low glare degree makes the glare less noticeable. The glare degree may be 16 or less, 15 or less, 14 or less, 13 or less, or 12 or less. By setting an upper limit for the glare degree, glare can be suppressed to a certain standard or less. There is no particular lower limit for the glare degree. The glare degree may be 0 or greater, or may be greater than 0. The glare degree is a value measured by the measurement method described in <<2-6. Glare Degree>> of the Examples below.

[0125] The glare level may be 0 or more and 16 or less, 0 or more and 15 or less, 0 or more and 14 or less, 0 or more and 13 or less, or 0 or more and 12 or less. The glare level may be 0 or more and 16 or less, 0 or more and 15 or less, 0 or more and 14 or less, 0 or more and 13 or less, or 0 or more and 12 or less.

[0126] <<Specular Gloss>> An upper limit may be set for the specular gloss of the first surface 11. Setting an upper limit for the specular gloss of the first surface 11 can effectively prevent an image of the background against which the antiglare sheet 10 is installed, such as a lighting device, from being reflected in the antiglare sheet 10. The specular gloss Gs(20) at an incident angle of 20° on the first surface 11 may be 8.0 or less, 5.0 or less, 4.0 or less, or 3.7 or less.

[0127] A lower limit may be set for the specular glossiness on the first surface 11. By setting a lower limit for the specular glossiness on the first surface 11, the contour of an object observed through the antiglare sheet 10 can be made clear. By setting a lower limit for the specular glossiness on the first surface 11, it is possible to prevent the antiglare sheet 10 from becoming cloudy, thereby improving the contrast of an object observed through the antiglare sheet 10. The specular glossiness Gs(20) when the angle of incidence on the first surface 11 is 20° may be 0.10 or more, 0.50 or more, 1.0 or more, 1.8 or more, 2.3 or more, or 2.5 or more.

[0128] The specular gloss Gs (20) may be 0.10 or more and 8.0 or less, 0.10 or more and 5.0 or less, 0.10 or more and 4.0 or less, or 0.10 or more and 3.7 or less. The specular gloss Gs (20) may be 0.50 or more and 8.0 or less, 0.50 or more and 5.0 or less, 0.50 or more and 4.0 or less, or 0.50 or more and 3.7 or less. The specular gloss Gs (20) may be 1.0 or more and 8.0 or less, 1.0 or more and 5.0 or less, 1.0 or more and 4.0 or less, or 1.0 or more and 3.7 or less. The specular gloss Gs (20) may be 1.8 or more and 8.0 or less, 1.8 or more and 5.0 or less, 1.8 or more and 4.0 or less, or 1.8 or more and 3.7 or less. The specular gloss Gs(20) may be 2.3 or more and 8.0 or less, 2.3 or more and 5.0 or less, 2.3 or more and 4.0 or less, or 2.3 or more and 3.7 or less. The specular gloss Gs(20) may be 2.5 or more and 8.0 or less, 2.5 or more and 5.0 or less, 2.5 or more and 4.0 or less, or 2.5 or more and 3.7 or less.

[0129] The specular gloss is a value measured in accordance with JIS Z8741:1997, except that the angle of incidence is set to 20°. The angle of incidence is the angle (°) between the normal direction to the incident object and the direction of incidence. The angle of incidence is between 0° and 90°. The measurement environment for measuring specular gloss is a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The measurement sample to be measured is placed in the measurement environment for 16 hours before starting the measurement. Before measuring the specular gloss, the light source of the measurement device is turned on for 15 minutes to stabilize the light source output.

[0130] The incident surface when measuring the specular gloss is the first surface 11 of the antiglare sheet 10. When measuring the specular gloss, a black plate is attached to the second surface 12 of the measurement sample to be measured via an optically transparent adhesive sheet. The total light transmittance of the optically transparent adhesive sheet is 91.5% or more. The total light transmittance of the black plate is less than 1%. An example of the optically transparent adhesive sheet is "Panaclean PD-S1" manufactured by Panac Corporation. An example of the black plate is "Comoglass 502K (black)" manufactured by Kuraray Co., Ltd.

[0131] The specular gloss is the arithmetic mean value of five measurements taken at five measurement positions on the sample to be evaluated, the five measurement positions being at least 10 mm apart from each other.

[0132] <<Internal Haze>> The upper limit of the internal haze of the antiglare sheet 10 having the above-described characteristic (A) may be adjusted. The internal haze is an index of the transmission haze caused by diffusion other than that caused by the uneven surface 11X formed on the outermost surface of the antiglare sheet 10.

[0133] A measurement sample for measuring internal haze is prepared by attaching a triacetyl cellulose film to the first surface 11, which forms the textured surface 11X, of the antiglare sheet 10, using a transparent adhesive. The transparent adhesive is "Panaclean PD-S1" manufactured by Panac Corporation. The thickness of the transparent adhesive is 25 μm. The triacetyl cellulose film is "TD80UL" manufactured by Fujifilm Corporation. The thickness of the triacetyl cellulose film is 80 μm.

[0134] The temperature and relative humidity of the environment in which the measurement sample is produced are 23°C ± 2°C and 50% ± 5%, respectively. The antiglare sheet, transparent adhesive, and triacetyl cellulose film used in producing the measurement sample are placed in the production environment for 16 hours before starting production.

[0135] The transmission haze of the measurement sample measured according to the above-described method for measuring transmission haze is the internal haze (%) of the antiglare sheet 10. The incident surface when measuring the internal haze of the antiglare sheet 10 is the second surface 12 of the antiglare sheet 10.

[0136] The internal haze is the arithmetic mean value of five measurements taken at five measurement positions on the antiglare sheet to be evaluated, the five measurement positions being spaced at least 10 mm apart from each other.

[0137] An upper limit may be set for the internal haze of the anti-glare sheet 10. By setting an upper limit for the internal haze of the anti-glare sheet 10, a decrease in contrast can be suppressed. By setting an upper limit for the internal haze of the anti-glare sheet 10 in addition to feature (A), it is possible to sufficiently improve anti-glare properties while suppressing a decrease in contrast. The internal haze of the anti-glare sheet 10 may be 5.0% or less, 3.5% or less, 3.0% or less, 2.0% or less, 1.8% or less, 1.7% or less, 1.6% or less, or 1.5% or less. No lower limit is particularly set for the internal haze of the anti-glare sheet 10. The internal haze of the anti-glare sheet 10 may be 0% or more, or may be greater than 0%.

[0138] The internal haze may be 0% or more and 5.0% or less, 0% or more and 3.5% or less, 0% or more and 3.0% or less, 0% or more and 2.0% or less, 0% or more and 1.8% or less, 0% or more and 1.7% or less, 0% or more and 1.6% or less, or 0% or more and 1.5% or less. The internal haze may be 0% or more and 5.0% or less, 0% or more and 3.5% or less, 0% or more and 3.0% or less, 0% or more and 2.0% or less, 0% or more and 1.8% or less, 0% or more and 1.7% or less, 0% or more and 1.6% or less, or 0% or more and 1.5% or less.

[0139] An upper limit may be set for the ratio of the internal haze of the antiglare sheet 10 to the transmission haze of the antiglare sheet 10 ("internal haze" / "transmission haze"). By setting an upper limit for the ratio of the internal haze of the antiglare sheet 10 to the transmission haze of the antiglare sheet 10, it is possible to sufficiently improve the antiglare properties while suppressing a decrease in contrast. The ratio of the internal haze of the antiglare sheet 10 to the transmission haze of the antiglare sheet 10 may be 0.20 or less, 0.10 or less, 0.094 or less, 0.090 or less, 0.080 or less, 0.070 or less, or 0.068 or less.

[0140] There is no particular lower limit set for the ratio of the internal haze of the antiglare sheet 10 to the transmission haze of the antiglare sheet 10. The ratio of the internal haze of the antiglare sheet 10 to the transmission haze of the antiglare sheet 10 may be 0 or greater, or may be greater than 0.

[0141] This ratio may be 0 to 0.20, 0 to 0.10, 0 to 0.094, 0 to 0.090, 0 to 0.080, 0 to 0.070, or 0 to 0.068. This ratio may be greater than 0 to 0.20, greater than 0 to 0.10, greater than 0 to 0.094, greater than 0 to 0.090, greater than 0 to 0.080, greater than 0 to 0.070, or greater than 0 to 0.068.

[0142] <<External Haze>> The upper and lower limits of the external haze of the antiglare sheet 10 may be adjusted. The external haze is an index of the transmission haze caused by diffusion due to the uneven surface 11X formed on the outermost surface of the antiglare sheet 10. The external haze is calculated by subtracting the internal haze from the transmission haze. In other words, the external haze is the difference between the transmission haze and the internal haze. The units of the external haze are the same as those of the transmission haze and the internal haze. The units of the external haze are the same as those of the internal haze. The units of the external haze are "%".

[0143] An upper limit may be set for the external haze. By setting an upper limit for the external haze, the occurrence of glare can be effectively suppressed. The present inventors have found that there is a strong correlation between the external haze and the occurrence of glare. By setting an upper limit for the external haze of the antiglare sheet 10 in addition to feature (A), it is possible to effectively suppress glare while sufficiently improving the antiglare properties. The external haze of the antiglare sheet 10 may be 35% or less, 32% or less, 29% or less, 28% or less, 27% or less, or 25% or less.

[0144] A lower limit may be set for the external haze. By setting a lower limit for the external haze, antiglare properties can be efficiently improved. By setting a lower limit for the external haze of the antiglare sheet 10 in addition to feature (A), antiglare properties can be efficiently improved while suppressing cloudiness. The external haze of the antiglare sheet 10 may be greater than 14%, 14.5% or more, 15% or more, 20% or more, 21% or more, or 22% or more.

[0145] The external haze may be greater than 14% and less than 35%, greater than 14% and less than 32%, greater than 14% and less than 29%, greater than 14% and less than 28%, greater than 14% and less than 27%, or greater than 14% and less than 25%. The external haze may be 14.5% to 35%, 14.5% to 32%, 14.5% to 29%, 14.5% to 28%, 14.5% to 27%, or 14.5% to 25%. The external haze may be 15% to 35%, 15% to 32%, 15% to 29%, 15% to 28%, 15% to 27%, or 15% to 25%. The external haze may be 20% or more and 35% or less, 20% or more and 32% or less, 20% or more and 29% or less, 20% or more and 28% or less, 20% or more and 27% or less, or 20% or more and 25% or less. The external haze may be 21% or more and 35% or less, 21% or more and 32% or less, 21% or more and 29% or less, 21% or more and 28% or less, 21% or more and 27% or less, or 21% or more and 25% or less. The external haze may be 22% or more and 35% or less, 22% or more and 32% or less, 22% or more and 29% or less, 22% or more and 28% or less, 22% or more and 27% or less, or 22% or more and 25% or less.

[0146] An anti-glare sheet having characteristics (A) and (B) and further having upper and lower limits set for the external haze can make the diffusion caused by the external haze dense and uniform. As a result, the anti-glare properties can be significantly improved while significantly suppressing glare. In addition, it is possible to reduce the internal haze and suppress internal diffusion, thereby effectively suppressing clouding of the anti-glare sheet. As described above, an anti-glare sheet having characteristics (A) and (B) and further having upper and lower limits set for the external haze can achieve both a significant improvement in anti-glare properties and a significant suppression of reduced visibility caused by glare, etc., and can also effectively suppress clouding of the anti-glare sheet.

[0147] As demonstrated in the examples described below, the antiglare sheet 10 having the features (A) and (Bx) and an external haze of greater than 14% and not greater than 35% was also able to achieve both improved antiglare properties and suppression of reduced visibility due to glare, etc., to the same extent as the antiglare sheet having the features (A) and (B).

[0148] (A): The transmission haze of the antiglare sheet 10 is 15% or more and 40% or less. (Bx): The ratio of the image clarity C(0.125) measured by a transmission method using an optical comb having a width of 0.125 mm to the image clarity C(2.0) measured by a transmission method using an optical comb having a width of 2.0 mm is 0.25 or more.

[0149] As described above, by setting a lower limit for the image clarity ratio defined by feature (Bx) and feature (B), it is possible to impart a denser and more uniform light diffusion function to the antiglare sheet 10 compared to conventional antiglare sheets. Feature (B) allows the antiglare sheet to have a denser and more uniform light diffusion function compared to feature (Bx).

[0150] External haze can efficiently improve the antiglare properties of an antiglare sheet. Therefore, it is presumed that an antiglare sheet 10 having characteristic (A) and an external haze of more than 14% and not more than 35% can simultaneously improve antiglare properties and suppress reduced visibility due to glare, etc., to the same extent as an antiglare sheet having characteristics (A) and (B), by having characteristic (Bx). However, the present disclosure is not bound by this presumption.

[0151] <<Total Light Transmittance>> The total light transmittance of the anti-glare sheet 10 may be 50% or more, 70% or more, 80% or more, or 90% or more. The total light transmittance of the anti-glare sheet 10 does not have a particular upper limit. The total light transmittance of the anti-glare sheet 10 may be 100% or less, or may be less than 100%.

[0152] The total light transmittance may be 50% or more and 100% or less, 70% or more and 100% or less, 80% or more and 100% or less, or 90% or more and 100% or less. The total light transmittance may be 50% or more and less than 100%, 70% or more and less than 100%, 80% or more and less than 100%, or 90% or more and less than 100%.

[0153] A D65 light source is used to measure the total light transmittance. Before measuring the total light transmittance, the light source of the device is turned on for 15 minutes to stabilize the output of the D65 light source. The angle of incidence on the measurement sample when measuring the total light transmittance is 0°. The incident surface when measuring the total light transmittance of the antiglare sheet 10 is the second surface 12 of the antiglare sheet 10. The test environment when measuring the total light transmittance is a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. The measurement sample is placed in the test environment for 16 hours before starting the test. Other measurement conditions when measuring the total light transmittance are in accordance with JIS K7361-1:1997.

[0154] The total light transmittance is the arithmetic mean value of five measured values. The five measured values ​​are measured at five measurement positions on the antiglare sheet 10 to be evaluated. The five measurement positions are located 10 mm or more apart from each other.

[0155] As used herein, "transparent" means that the total light transmittance is 50% or more. The total light transmittance of a transparent object may be 70% or more, 80% or more, or 90% or more.

[0156] <<Layers Included in Antiglare Sheet>> Each layer included in the antiglare sheet 10 will be described in further detail with reference to the antiglare sheet 10 shown in Fig. 1. The antiglare sheet 10 shown in Fig. 1 includes, in this order from the second surface 12 to the first surface 11 in the first direction D1, a substrate 20 and an antiglare layer 30.

[0157] The antiglare sheet 10 may further include other layers. In the example shown in FIG. 2 , the antiglare sheet 10 includes a substrate 20, an antiglare layer 30, and a functional layer 40, in this order. The functional layer 40 may include a binder resin and particles. The particles may be low-refractive-index particles. The refractive index of the particles may be lower than the refractive index of the binder resin. In the example shown in FIG. 2 , the functional layer 40 may be configured as a layer with a refractive index lower than that of the antiglare layer 30. The functional layer 40 may be a low-reflection layer or anti-reflection layer that has the function of suppressing reflection.

[0158] The antiglare sheet 10 may further include two or more layers. In the example shown in FIG. 3 , the antiglare sheet 10 includes a substrate 20, an antiglare layer 30, a second functional layer 50, and a functional layer 40, in this order. The second functional layer 50 may include a binder resin and particles. The particles may be high-refractive-index particles. The refractive index of the particles may be higher than the refractive index of the binder resin. In the example shown in FIG. 3 , the functional layer 40 may be configured as a layer with a lower refractive index than the second functional layer 50. The second functional layer 50 may be configured as a layer with a higher refractive index than the antiglare layer 30. The functional layer 40 and the second functional layer 50 may be low-reflection layers or anti-reflection layers that have the function of suppressing reflection.

[0159] The antiglare sheet 10 may include other functional layers different from those shown in the drawings, such as an antifouling layer, a hard coat layer, and an antistatic layer.

[0160] In the illustrated example, the first direction D1 is the stacking direction. The layers 20, 30, 40, and 50 included in the antiglare sheet 10 are stacked in the first direction D1. Each of the layers 20, 30, 40, and 50 has a normal direction parallel to the first direction D1. Each of the layers 20, 30, 40, and 50 extends in a second direction D2 and a third direction D3 that are perpendicular to the first direction D1. In the illustrated example, the second direction D2 and the third direction D3 are perpendicular to each other.

[0161] In the example shown in Fig. 1, the first surface 11 is formed by the antiglare layer 30. In the examples shown in Figs. 2 and 3, the first surface 11 is formed by the functional layer 40. The functional layer 40 and the second functional layer 50 are thin layers that extend along the uneven surface 31X of the antiglare layer 30. In the examples shown in Figs. 2 and 3, the first surface 11 is formed as an uneven surface 11X having unevenness corresponding to the uneven surface 31X of the antiglare layer 30.

[0162] The substrate 20, the antiglare layer 30, the functional layer 40, and the second functional layer 50 will be described below.

[0163] <Substrate 20> The substrate 20 supports the antiglare layer 30. As shown in Figures 1 to 3, the substrate 20 may constitute the second surface 12 of the antiglare sheet 10. The second surface 12 may be a flat surface. The second surface 12 may be a surface perpendicular to the first direction D1.

[0164] The substrate 20 may be transparent. Transparent means that the total light transmittance is 50% or more, and may be 70% or more, 80% or more, or 90% or more.

[0165] The material of the substrate 20 is not particularly limited, and may be resin or glass. Resin is preferable because it is lightweight and easy to manufacture.

[0166] The resin used for the substrate 20 may be an olefin-based resin such as polyethylene or polypropylene. The resin used for the substrate 20 may be a vinyl-based resin such as polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene-vinyl acetate copolymer, or ethylene-vinyl alcohol copolymer. The resin used for the substrate 20 may be an ester-based resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate. The resin used for the substrate 20 may be an acrylic-based resin such as polymethyl(meth)acrylate or polyethyl(meth)acrylate. The resin used for the substrate 20 may be a styrene-based resin such as polystyrene, a polyamide-based resin such as nylon 6 or nylon 66, or a cellulose-based resin such as triacetyl cellulose. Further examples of resins used for the substrate 20 include resins such as polycarbonate, polyimide-based resins, and cycloolefin resins obtained from cycloolefins such as norbornene and dicyclopentadiene. The antiglare layer 30 may contain only one of the above-mentioned resins, or two or more of the above-mentioned resins.

[0167] A substrate containing a polyester-based resin such as polyethylene terephthalate or polyethylene naphthalate may be stretched. The stretching may be uniaxial stretching. The stretching may be biaxial stretching. The stretched substrate containing a polyester-based resin has birefringence. The retardation Re of the stretched substrate containing a polyester-based resin may be adjusted.

[0168] The retardation Re is expressed by the following formula, where nx is the refractive index in the direction (slow axis direction) with the largest refractive index in the plane of the substrate, ny is the refractive index in the direction (fast axis direction) perpendicular to the slow axis direction, and d is the thickness of the substrate. The retardation Re (nm) is the value measured (measurement angle 0°, measurement wavelength 589.3 nm) using a KOBRA-WR manufactured by Oji Scientific Instruments. Retardation Re = (nx - ny) × d

[0169] The stretched substrate containing a polyester-based resin may have a high retardation Re. A stretched substrate with a high retardation Re can make rainbow unevenness less noticeable. Rainbow unevenness is a striped pattern observed in rainbow colors. From the viewpoint of making rainbow unevenness less noticeable, the retardation Re of the stretched substrate containing a polyester-based resin may be 3000 nm or more, 5000 nm or more, or 7000 nm or more. The retardation Re of the stretched substrate in this example may be 30,000 nm or less.

[0170] The stretched substrate containing a polyester-based resin may have a low retardation Re. A stretched substrate with a low retardation Re can also make rainbow unevenness less noticeable. From the viewpoint of making rainbow unevenness less noticeable, the retardation Re of the stretched substrate containing a polyester-based resin may be 1100 nm or more, 1000 nm or less, or 900 nm or less. The retardation Re of the stretched substrate in this example may be 0 nm or more, or may be greater than 0 nm.

[0171] The thickness of the resin substrate 20 is not particularly limited. From the viewpoint of ease of handling, the thickness of the resin substrate 20 may be 10 μm or more, 20 μm or more, or 50 μm or more. The thickness of the resin substrate 20 may be 500 μm or less, 400 μm or less, or 300 μm or less. The thickness of the glass substrate 20 may be 500 μm or more. The thickness of the glass substrate 20 may be 5 mm or less.

[0172] When the antiglare sheet 10 is applied to a foldable application, the substrate 20 may be flexible. In this example, the thickness of the resin substrate 20 may be 10 μm or more and 40 μm or less. When the antiglare sheet 10 is used by being laminated with glass, the thickness of the resin substrate 20 may be 40 μm or more and 100 μm or less from the viewpoint of preventing the glass from shattering.

[0173] The substrate 20 may include only a single layer or multiple layers. The substrate 20 may include a primer layer such as an easy-adhesion layer.

[0174] <Anti-glare layer> The anti-glare layer 30 suppresses reflected and scattered light and is a layer that plays a central role in anti-glare properties. The anti-glare layer 30 includes a first surface 31 and a second surface 32. The first surface 31 faces a first side in the first direction D1. The second surface 32 faces a second side in the first direction D1. The first surface 31 may be an uneven surface 31X having unevenness. The second surface 32 may be a flat surface. The anti-glare layer 30 may be connected to the substrate 20 at the second surface 32. The anti-glare layer 30 may be bonded to the substrate 20 at the second surface 32.

[0175] In the example shown in FIG. 1 , the first surface 31 of the anti-glare layer 30 constitutes the first surface 11 of the anti-glare sheet 10. The first surface 11 is an uneven surface 11X constituted by an uneven surface 31X. Ambient light in the environment in which the anti-glare sheet 10 is installed is diffusely reflected by the first surface 11 as the uneven surface 11X. This diffuse reflection prevents background images in the environment in which the anti-glare sheet 10 is installed from being reflected on the anti-glare sheet 10. In this way, the anti-glare layer 30 and the anti-glare sheet 10 exhibit anti-glare properties.

[0176] In the example shown in Figures 2 and 3, the functional layer 40 constitutes the first surface 11 of the anti-glare sheet 10. The functional layer 40 is a very thin layer that extends along the uneven surface 31X. The first surface 11 is an uneven surface 11X that includes unevenness corresponding to the unevenness of the uneven surface 31X. Ambient light in the environment in which the anti-glare sheet 10 is installed is diffusely reflected by the first surface 11 as the uneven surface 11X. This diffuse reflection prevents background images in the environment in which the anti-glare sheet 10 is installed from being reflected on the anti-glare sheet 10. In this way, the anti-glare layer 30 and the anti-glare sheet 10 exhibit anti-glare properties.

[0177] (Method for Producing Antiglare Sheet) The antiglare layer 30 can be produced by, for example, (X) shaping with an embossing roll, (Y) etching treatment, (Z) molding with a mold, or (W) forming a coating film by coating. According to the production method (Z), the irregular surface 31X of the desired shape can be produced stably. According to the production method (W), an antiglare layer coating liquid is used to form the antiglare layer 30. The antiglare layer 30 is obtained by drying and curing the coating film of the antiglare layer coating liquid. The production method (W) is excellent in productivity and compatibility with a wide variety of products. The following two methods may be adopted as the production method for (W). In the first method (W1), a coating liquid containing a binder resin and particles is applied to form irregularities due to the presence of the particles. In the second method (W2), a coating liquid containing an arbitrary resin and a resin that is poorly compatible with the resin is applied to cause phase separation of the resin to form irregularities. The first method (W1) makes it easy to control the uneven surface 31X.

[0178] The average thickness T of the antiglare layer 30 can be determined in consideration of the balance between curl suppression, mechanical strength, hardness, toughness, etc. The average thickness T of the antiglare layer may be 2 μm or more and 10 μm or less, or 4 μm or more and 8 μm or less.

[0179] The "average thickness" used for each layer included in the anti-glare sheet is a value specified by the following (A1) to (A3). (A1) A cross section of the anti-glare sheet is imaged using a scanning transmission electron microscope (STEM) to obtain an observation image. The imaging area is determined so that the thickness direction of the layer to be measured is along the short side of the rectangular imaging area. The magnification during imaging is an appropriate magnification such that the thickness of the layer to be measured is equal to or greater than 1 / 3 and equal to or less than 2 / 3 of the length of the short side of the imaging area. (A2) In the image, the thickness of the layer to be measured is measured at a central position along the sheet surface of the anti-glare sheet, and at positions shifted 50 μm on both sides from the central position along the sheet surface of the anti-glare sheet. The thickness is defined as the length (μm) of the layer to be measured along the direction perpendicular to the sheet surface of the anti-glare sheet. (A3) For the layer to be measured, the above steps (A1) and (A2) are performed five times to measure the thickness of the layer to be measured at a total of 15 positions. The average of the 15 thickness measurements is taken as the average thickness (μm) of the layer being measured.

[0180] (Components) The antiglare layer mainly contains a resin component and may contain additives as necessary. Examples of additives include particles such as organic particles and inorganic fine particles, refractive index adjusters, antistatic agents, antifouling agents, UV absorbers, light stabilizers, antioxidants, viscosity adjusters, and thermal polymerization initiators.

[0181] 1 to 3 , the antiglare layer 30 may include a binder resin 36 and particles 37. The particles 37 may be organic particles. The particles 37 may be inorganic particles. The antiglare layer 30 may include both organic particles and inorganic particles as the particles 37.

[0182] (Particles) Examples of organic particle materials include polymethyl methacrylate, polyacrylic-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, silicone, fluorine-based resin, and polyester-based resin. Examples of inorganic particle materials include silica, alumina, zirconia, and titania. The inorganic particles may be irregular inorganic particles. An example of the irregular inorganic particles is irregular silica. Irregular inorganic particles make it easier to impart the above-mentioned characteristics such as image clarity, transmission haze, and specular gloss to the antiglare sheet 10.

[0183] The average particle diameter D of the particles 37 may be 1.0 μm or more and 9.0 μm or less, 1.5 μm or more and 7.5 μm or less, or 1.7 μm or more and 5.8 μm or less. By reducing the average particle diameter D of the particles 37, dense and uniform light diffusion can be easily achieved. This makes it easier to impart the above-mentioned characteristics such as image clarity, transmission haze, and specular gloss to the antiglare sheet 10.

[0184] The "average particle size" used for particles such as organic particles and inorganic particles is a value specified by the following (B1) to (B3). Although particles may aggregate, the average particle size is the average primary particle size. (B1) The cross section of an antiglare sheet containing particles is imaged using a scanning transmission electron microscope (STEM) to obtain an observation image. The imaging area is determined so that the thickness direction of the layer containing the particles to be measured is along the short side of the rectangular imaging area. The imaging magnification is an appropriate magnification such that the thickness of the layer containing the particles to be measured is between 1 / 3 and 2 / 3 of the length of the short side of the imaging area. (B2) Ten particles are randomly selected from the observation image, and the particle diameter of each particle is measured. The particle diameter (μm) is the distance between two parallel lines that form the longest distance between the cross section of the particle. In other words, the particle diameter is the maximum length of the particle in the observation image. The particle size is specified as the particle size (maximum length) of each particle. In other words, the particle size is the primary particle size. (B3) For the same antiglare sheet to be measured, the above steps (B1) and (B2) are performed five times to measure the particle sizes of a total of 50 particles. The average of the total 50 particle size measurements is taken as the average particle size (μm) of the particles.

[0185] The content of particles 37 such as organic particles and inorganic particles may be 1 part by mass or more and 30 parts by mass or less, 4 parts by mass or more and 20 parts by mass or less, or 9 parts by mass or more and 15 parts by mass or less, relative to 100 parts by mass of the binder resin. By setting the particle content to 10 parts by mass or more, it becomes easier to impart the above-mentioned properties such as image clarity, transmission haze, and specular gloss to the antiglare sheet 10. By setting the particle content to 200 parts by mass or less, it is possible to suppress the particles 37 from falling off from the antiglare layer 30.

[0186] (Inorganic Fine Particles) The antiglare layer 30 may further contain inorganic fine particles in addition to the binder resin 36 and the particles 37. The inorganic fine particles are distinguished from the above-described particles 37 by their average particle diameter. When the antiglare layer 30 contains inorganic fine particles, it is possible to impart fine irregularities to the irregular surface 31X that can be distinguished from the irregularities formed by the particles 37. The irregular surface 31X including the fine irregularities makes it easy to achieve dense and uniform light diffusion. The irregular surface 31X including the fine irregularities makes it easy to impart the above-described characteristics such as image clarity, transmission haze, and specular gloss to the antiglare sheet 10.

[0187] When the anti-glare layer 30 contains inorganic fine particles, the difference in refractive index between the particles 37 and the components of the anti-glare layer 30 other than the particles 37 becomes smaller. Therefore, the internal haze of the anti-glare layer 30 can be reduced, effectively suppressing glare. Furthermore, dense and uniform light diffusion can be easily achieved. The anti-glare layer 30 containing inorganic fine particles makes it easier to impart the above-mentioned characteristics, such as image clarity, transmission haze, and specular gloss, to the anti-glare sheet 10.

[0188] Examples of inorganic fine particle materials include silica, alumina, zirconia, and titania. The average particle diameter of the inorganic fine particles may be 1 nm or more and 200 nm or less, 2 nm or more and 100 nm or less, or 5 nm or more and 50 nm or less. The average particle diameter of the inorganic fine particles can be measured in the same manner as the average particle diameter of the particles described above.

[0189] The content of the inorganic fine particles may be 0.7 parts by mass or more and 15 parts by mass or less, 1 part by mass or more and 10 parts by mass or less, or 2 parts by mass or more and 6 parts by mass or less, relative to 100 parts by mass of the binder resin. By setting the content of the inorganic fine particles to 0.7 parts by mass or more, it is possible to easily obtain the effects based on the inorganic fine particles described above. The content of the inorganic fine particles may be 15 parts by mass or less.

[0190] (Binder Resin) The binder resin 36 may include a cured resin. The cured resin is a cured product of a curable resin composition. The curable resin composition may be a thermosetting resin composition. The curable resin composition may be an ionizing radiation curable resin composition. The binder resin 36 may include a cured product of a curable resin composition and a cured product of an ionizing radiation curable resin composition.

[0191] The thermosetting resin composition contains a thermosetting resin. The thermosetting resin composition is cured by heating. Examples of the thermosetting resin include acrylic resin, urethane resin, phenolic resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin. The thermosetting resin composition may contain one or more of these curable resins and a curing agent.

[0192] The ionizing radiation-curable resin composition contains a compound having an ionizing radiation-curable functional group. Hereinafter, the compound having an ionizing radiation-curable functional group is also referred to as an "ionizing radiation-curable compound." Examples of the ionizing radiation-curable functional group include ethylenically unsaturated bond groups such as (meth)acryloyl groups, vinyl groups, and allyl groups, as well as epoxy groups and oxetanyl groups. The ionizing radiation-curable compound may contain an ethylenically unsaturated bond group. The ionizing radiation-curable compound may contain two or more ethylenically unsaturated bond groups. The ionizing radiation-curable compound may be a polyfunctional (meth)acrylate compound containing two or more ethylenically unsaturated bond groups. The polyfunctional (meth)acrylate compound may contain either a monomer or an oligomer. The ionizing radiation may be electromagnetic waves or charged particle beams. The ionizing radiation has an energy quantum capable of polymerizing or crosslinking molecules. Examples of ionizing radiation include ultraviolet (UV) rays, electron beams (EB), X-rays, gamma rays, alpha rays, and ion rays.

[0193] Among the polyfunctional (meth)acrylate compounds, examples of bifunctional (meth)acrylate monomers include ethylene glycol di(meth)acrylate, bisphenol A tetraethoxydiacrylate, bisphenol A tetrapropoxydiacrylate, 1,6-hexanediol diacrylate, etc. Examples of trifunctional or higher functional (meth)acrylate monomers include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol tetra(meth)acrylate, isocyanuric acid-modified tri(meth)acrylate, etc. The (meth)acrylate monomer may have a partially modified molecular skeleton. The (meth)acrylate monomer may have a part of its molecular skeleton modified with ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol, or the like.

[0194] Examples of polyfunctional (meth)acrylate oligomers include acrylate polymers such as urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, and polyether (meth)acrylate. Urethane (meth)acrylate can be obtained, for example, by reacting a polyhydric alcohol and an organic diisocyanate with a hydroxy (meth)acrylate. The epoxy (meth)acrylate may be a (meth)acrylate obtained by reacting a trifunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with (meth)acrylic acid. The epoxy (meth)acrylate may be a (meth)acrylate obtained by reacting a difunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with a polybasic acid and (meth)acrylic acid. The epoxy (meth)acrylate may be a (meth)acrylate obtained by reacting a difunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with a phenol and (meth)acrylic acid.

[0195] A monofunctional (meth)acrylate may be used as the ionizing radiation curable compound for the purpose of adjusting the viscosity of the antiglare layer coating liquid for forming the antiglare layer 30. Examples of the monofunctional (meth)acrylate include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, and isobornyl (meth)acrylate.

[0196] One type of ionizing radiation curable compound may be used alone, or two or more types of ionizing radiation curable compounds may be used in combination.

[0197] When the ionizing radiation curable compound is an ultraviolet curable compound, the curable resin composition forming the binder resin 36 may contain additives such as a photopolymerization initiator or a photopolymerization accelerator. Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler's ketone, benzoin, benzyl dimethyl ketal, benzoyl benzoate, α-acyloxime ester, α-aminoalkylphenone, thioxanthones, and the like. The photopolymerization accelerator reduces polymerization inhibition by air during curing and increases the curing rate. Examples of the photopolymerization accelerator include one or more selected from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, and the like.

[0198] When the binder resin 36 contains a cured product of an ionizing radiation curable resin composition, it may have the following configuration (C1) or (C2).

[0199] (C1) Binder resin 36 includes a cured product of an ionizing radiation curable resin composition and a thermoplastic resin. (C2) Binder resin 36 includes substantially only a cured product of an ionizing radiation curable resin composition, and includes 70 mass% or more of a monomer component as the ionizing radiation curable compound contained in the ionizing radiation curable resin composition.

[0200] When the above-described configuration (C1) is adopted, the viscosity of the antiglare layer coating liquid for forming the antiglare layer 30 is increased by the thermoplastic resin. The particles 37 are less likely to sink in the antiglare layer coating liquid. The uneven surface 31X, which includes fine irregularities, facilitates the realization of dense and uniform light diffusion. The above-described characteristics, such as image clarity, transmission haze, and specular gloss, can be easily imparted to the antiglare sheet 10.

[0201] Examples of thermoplastic resins include polystyrene-based resins, polyolefin-based resins, ABS resins (including heat-resistant ABS resins), AS resins, AN resins, polyphenylene oxide-based resins, polycarbonate-based resins, polyacetal-based resins, acrylic-based resins, polyethylene terephthalate-based resins, polybutylene terephthalate-based resins, polysulfone-based resins, and polyphenylene sulfide-based resins.

[0202] The weight average molecular weight of the thermoplastic resin may be from 20,000 to 200,000, from 30,000 to 150,000, or from 50,000 to 100,000. The weight average molecular weight is an average molecular weight measured by GPC analysis and converted into standard polystyrene.

[0203] In the above structure (C1), the mass ratio of the cured product of the ionizing radiation-curable resin composition to the thermoplastic resin may be 60:40 to 90:10, or 70:30 to 80:20. By using 10 parts by mass or more of the thermoplastic resin per 90 parts by mass of the cured product of the ionizing radiation-curable resin composition, the effect of increasing the viscosity of the antiglare layer coating liquid can be effectively obtained. By using 40 parts by mass or less of the thermoplastic resin per 60 parts by mass of the cured product of the ionizing radiation-curable resin composition, the mechanical strength of the antiglare layer can be improved.

[0204] When the above-described configuration (C2) is adopted, the particles 37 are spread out on the bottom of the antiglare layer 30, and the particles 37 are likely to be stacked in some regions. Furthermore, a very thin binder resin 36 covers the particles 37. By adjusting the average particle diameter of the particles 37, the antiglare layer 30 can easily achieve dense and uniform light diffusion. This makes it easier to impart the above-described characteristics, such as image clarity, transmission haze, and specular gloss, to the antiglare sheet 10.

[0205] In the above structure (C2), the proportion of the cured product of the ionizing radiation curable resin composition relative to the total amount of binder resin 36 may be 90% by mass or more, 95% by mass or more, or even 100% by mass. In the above structure (C2), the proportion of the monomer component relative to the total amount of the ionizing radiation curable compound may be 70% by mass or more, or 75% by mass or more. When the above structure (C2) is adopted, the monomer component may be a polyfunctional (meth)acrylate compound.

[0206] <Anti-glare layer coating liquid> As described above, the anti-glare layer 30 may be produced by drying and curing a coating film of the anti-glare layer coating liquid. The anti-glare layer coating liquid may contain a curable resin composition and particles. The anti-glare layer coating liquid used to produce the anti-glare layer 30 may contain additives such as an antistatic agent, an antioxidant, a surfactant, a dispersant, and an ultraviolet absorber.

[0207] The antiglare layer coating liquid may contain a silicone-based leveling agent (silicone-based compound) as an additive. The inclusion of a silicone-based leveling agent in the antiglare layer coating liquid can suppress protrusion of the particles 37 from the first surface 11. This smoothes the first surface 11, making it easier for the resulting antiglare layer 30 to achieve dense and uniform light diffusion. This also makes it easier to impart the above-mentioned characteristics, such as image clarity, transmission haze, and specular gloss, to the antiglare sheet 10.

[0208] By using a silicone-based leveling agent instead of a fluorine-based leveling agent, it is possible to suppress the generation of PFAS as an impurity. PFAS is an artificial organic fluorine compound, and there are concerns about its bioaccumulation. Suppressing the generation of PFAS can contribute to reducing the environmental impact.

[0209] The antiglare layer coating liquid may contain a solvent. The viscosity of the antiglare layer coating liquid can be adjusted by the solvent. The dispersion of each component can be controlled by the solvent. The surface properties of the obtained antiglare layer 30 vary depending on the type of solvent. The type of solvent may be selected taking into consideration the saturated vapor pressure, the permeability of the solvent into the transparent substrate, etc. Examples of the solvent include ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone (MIBK), cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons (cyclohexane, etc.), aromatic hydrocarbons (toluene, xylene, etc.), halogenated carbons (dichloromethane, dichloroethane, etc.), esters (methyl acetate, ethyl acetate, butyl acetate, etc.), alcohols (isopropanol, butanol, cyclohexanol, etc.), cellosolves (methyl cellosolve, ethyl cellosolve, etc.), glycol ethers (propylene glycol monomethyl ether acetate, etc.), cellosolve acetates, sulfoxides (dimethyl sulfoxide, etc.), amides (dimethylformamide, dimethylacetamide, etc.), etc. The antiglare layer coating liquid may contain one or more solvents.

[0210] The antiglare layer coating liquid may contain a solvent with a high evaporation rate. Increasing the evaporation rate of the solvent can prevent the particles 37 from settling to the bottom of the antiglare layer 30. This makes it easier for the obtained antiglare layer 30 to achieve dense and uniform light diffusion. This also makes it easier to impart the above-mentioned characteristics such as image clarity, transmission haze, and specular gloss to the antiglare sheet 10.

[0211] A solvent with a fast evaporation rate means a solvent with an evaporation rate of 100 or more, assuming that the evaporation rate of butyl acetate is 100. The evaporation rate of a solvent with a fast evaporation rate may be 120 or more and 300 or less, or 150 or more and 220 or less. Examples of solvents with a fast evaporation rate include methyl isobutyl ketone (evaporation rate 160), toluene (evaporation rate 200), and methyl ethyl ketone (evaporation rate 370).

[0212] The antiglare layer coating liquid may contain a small amount of a solvent having a slow evaporation rate in addition to a solvent having a fast evaporation rate. A solvent having a slow evaporation rate means a solvent having an evaporation rate of less than 100, where the evaporation rate of butyl acetate is taken as 100. The evaporation rate of a solvent having a slow evaporation rate may be 20 or more and 60 or less, or 25 or more and 40 or less. Examples of solvents having a slow evaporation rate include cyclohexanone (evaporation rate 32) and propylene glycol monomethyl ether acetate (evaporation rate 44).

[0213] When an antiglare layer is prepared from the antiglare layer coating liquid, the drying conditions of the coating film of the antiglare layer coating liquid may be adjusted. The drying conditions can be adjusted by the drying temperature and the air speed in the dryer. The drying temperature may be 30°C or higher and 120°C or lower. The drying air speed may be 0.2 m / s or higher and 50 m / s or lower. In order to adjust the surface properties of the antiglare layer by drying, the coating film may be irradiated with ionizing radiation after drying.

[0214] <Functional Layer> The antiglare sheet 10 shown in Fig. 2 further includes a functional layer 40. The functional layer 40 constitutes the first surface 11. The illustrated functional layer 40 is a low refractive index layer. A low refractive index layer has a refractive index lower than the refractive index of an adjacent layer. The functional layer 40 as a low refractive index layer is a low reflection layer or anti-reflection layer that has the function of suppressing reflection.

[0215] Specifically, the functional layer 40 may include a binder resin and particles. The particles may have a low refractive index. The refractive index of the particles may be lower than the refractive index of the binder resin. The refractive index of the functional layer 40 is reduced by including the particles with a low refractive index. The refractive index of the functional layer 40 is lower than the refractive index of the antiglare layer 30.

[0216] The functional layer 40 can suppress reflection of incident light due to its refractive index and thickness. The anti-reflection function of the functional layer 40 is based on the interference of light reflected on both surfaces of the functional layer 40. From the viewpoint of making this anti-reflection function effective, the refractive index of the functional layer 40 may be between the refractive indices of the two regions adjacent to the functional layer 40 on both sides. The thickness (nm) of the functional layer 40 may be approximately 1 / 4 of the wavelength λ (nm) of the light whose reflection is to be suppressed.

[0217] From the viewpoint of the reflection suppression function, the refractive index of the functional layer 40 and the average thickness of the functional layer 40 can be set as follows. The refractive index of the functional layer may be 1.10 or more, 1.20 or more, 1.26 or more, 1.28 or more, or 1.30 or more. The refractive index of the functional layer may be 1.48 or less, 1.45 or less, 1.40 or less, 1.38 or less, or 1.35 or less. The refractive index used for the components that make up the antiglare sheet is the refractive index at a wavelength of 589.3 nm.

[0218] The thickness of the functional layer 40 may be 80 nm or more, 85 nm or more, or 90 nm or more. The thickness of the functional layer may be 150 nm or less, 110 nm or less, or 105 nm or less.

[0219] The binder resin contained in the functional layer 40 may be the same as the binder resin contained in the antiglare layer 30. The binder resin contained in the functional layer 40 may include a cured product of a curable resin composition. The curable resin composition may include one or more of a thermosetting resin composition and an ionizing radiation curable resin composition.

[0220] The particles contained in the functional layer 40 may be the same as the particles 37 contained in the antiglare layer 30. The functional layer 40 may contain one or more organic particles and inorganic particles. The functional layer 40 may contain one or more of hollow silica, solid silica, and magnesium fluoride particles as inorganic particles.

[0221] The hollow silica particles have an outer shell layer made of silica. The hollow silica particles have a hollow interior surrounded by the outer shell layer. Air may be contained within the hollow interior. The hollow silica particles have a refractive index lower than that of silica due to the internal cavity. The refractive index of hollow silica particles decreases as the volume of the internal cavity increases. The hollow silica particles reduce the refractive index of the entire functional layer 40.

[0222] The functional layer 40 may be produced by a wet method, similar to the antiglare layer 30. The functional layer 40 may be produced using a functional layer coating liquid for forming the functional layer 40. The functional layer 40 may be produced by drying and curing a coating film of the functional layer coating liquid. The functional layer coating liquid for producing the functional layer 40 may contain an additive that can be added to the antiglare layer coating liquid.

[0223] <Second Functional Layer> The antiglare sheet 10 shown in Fig. 3 includes a functional layer 40 and a second functional layer 50. In the example shown in Fig. 3, the functional layer 40 may be configured similarly to the above-described functional layer 40 included in the antiglare sheet 10 shown in Fig. 2. That is, the functional layer 40 constitutes the first surface 11. The functional layer 40 is a low refractive index layer. The low refractive index layer has a refractive index lower than the refractive index of the adjacent second functional layer 50.

[0224] The second functional layer 50 is located between the functional layer 40 and the anti-glare layer 30 in the first direction D1, which is the stacking direction. The second functional layer 50 has a refractive index higher than the refractive index of the anti-glare layer 30 and the refractive index of the functional layer 40. The functional layer 40 as a low refractive index layer and the second functional layer 50 as a high refractive index layer function as a low-reflection layer or anti-reflection layer and suppress reflection on the first surface 11.

[0225] Specifically, the second functional layer 50 may include a binder resin and particles. The particles may be high-refractive-index particles. The refractive index of the particles may be higher than the refractive index of the binder resin. The refractive index of the second functional layer 50 is increased by including the high-refractive-index particles. The refractive index of the second functional layer 50 is higher than the refractive index of the anti-glare layer 30.

[0226] From the viewpoint of the anti-reflection function, the refractive index of the second functional layer 50 and the average thickness of the functional layer may be set as follows: The refractive index of the second functional layer may be 1.55 or more, or 1.56 or more. The refractive index of the second functional layer may be 1.85 or less, or 1.75 or less. The thickness of the second functional layer 50 may be 50 nm or more. The thickness of the second functional layer may be 200 nm or less, or 180 nm or less.

[0227] The binder resin contained in the second functional layer 50 may be the same as the binder resin contained in the antiglare layer 30. The binder resin contained in the second functional layer 50 may include a cured product of a curable resin composition. The curable resin composition may include one or more of a thermosetting resin composition and an ionizing radiation curable resin composition.

[0228] The particles contained in the second functional layer 50 may be similar to the particles 37 contained in the antiglare layer 30. The second functional layer 50 may contain one or more organic particles and inorganic particles. Examples of particles contained in the second functional layer 50 include antimony pentoxide, zinc oxide, titanium oxide, cerium oxide, tin-doped indium oxide, antimony-doped tin oxide, yttrium oxide, and zirconium oxide.

[0229] The second functional layer 50 may be produced by a wet method, similar to the antiglare layer 30. The second functional layer 50 may be produced using a second functional layer coating liquid for forming the second functional layer 50. The second functional layer 50 may be produced by drying and curing a coating film of the second functional layer coating liquid. The second functional layer coating liquid for producing the second functional layer 50 may contain an additive that can be applied to the antiglare layer coating liquid.

[0230] <<<Sheet Article>>> According to the wet method for manufacturing an anti-glare sheet 10, a long sheet article 5 including a large number of anti-glare sheets 10 can be manufactured, as shown in Fig. 4. The long sheet article 5 is cut to a predetermined size to obtain the anti-glare sheet 10. According to this example, anti-glare sheets 10 having various dimensions can be obtained from the long sheet article 5 in accordance with needs. Therefore, anti-glare sheets 10 having various dimensions can be provided in a timely manner. As shown in Fig. 4, handling the sheet article 5 as a roll 7 wound around a winding core about a winding axis RA improves the handleability of the sheet article 5.

[0231] <<<Polarizing Plate>>> The anti-glare sheet 10 according to the present embodiment may be applied to a polarizing plate 60. In the example shown in Fig. 5 , the polarizing plate 60 includes a first protective sheet 61, a polarizer 62, and a second protective sheet 63. The first protective sheet 61 and the second protective sheet 63 sandwich the polarizer 62 and cover it from both sides. At least one of the first protective sheet 61 and the second protective sheet 63 may include the anti-glare sheet 10. The first protective sheet 61 located on the first side (viewer side) in the first direction D1 may include the anti-glare sheet 10. When only one of the first protective sheet 61 and the second protective sheet 63 includes the anti-glare sheet 10, the other protective sheet may be a resin film.

[0232] The polarizer 62 transmits one linearly polarized component and blocks the other linearly polarized component. The polarizer 62 may be an absorptive polarizer that absorbs the other linearly polarized component. The polarizer 62 may be a reflective polarizer that reflects the other linearly polarized component. The polarizer 62 may be a sheet-type polarizer such as a stretched polyvinyl alcohol film, polyvinyl formal film, polyvinyl acetal film, or saponified ethylene-vinyl acetate copolymer film dyed with iodine or the like. The polarizer 62 may be a wire-grid polarizer made of a large number of metal wires arranged in parallel. The polarizer 62 may be a coated polarizer coated with a lyotropic liquid crystal or a dichroic guest-host material, or a multilayer thin-film polarizer.

[0233] <<<Image Display Device>>> The anti-glare sheet 10 according to this embodiment may be applied to a display device 65. In the example shown in FIG. 6 , the display device 65 includes a display element 66 and the anti-glare sheet 10. The display element 66 has an image forming surface 66a on which an image is displayed. The anti-glare sheet 10 is overlaid on the display element 66 with its second surface 12 facing the image forming surface 66a. The anti-glare sheet 10 may be bonded to the display element 66 via a bonding layer containing an adhesive, a pressure-sensitive adhesive, or the like. The display element 66 is not particularly limited. Examples of the display element 66 include a liquid crystal display element, an EL display element, a plasma display element, and an electronic paper element.

[0234] The observer observes an image displayed by the display element 66 through the anti-glare sheet 10. As described above, the anti-glare sheet 10 can effectively achieve both improved anti-glare properties and reduced glare. Therefore, in a display device 65 to which the anti-glare sheet 10 is applied, background images in the environment in which the display device 65 is placed, such as lighting devices, can be prevented from being reflected in the anti-glare sheet 10. Furthermore, glare that may occur on the display surface of the display device 65 can be effectively made less noticeable. As a result, deterioration of the image displayed by the display device 65 can be effectively prevented. The observer can observe a high-quality image.

[0235] As described above, it is possible to effectively prevent the contours of an object observed through the anti-glare sheet 10 from becoming unclear. Furthermore, it is possible to effectively prevent the anti-glare sheet 10 from becoming cloudy and the contrast of an object observed through the anti-glare sheet 10 from decreasing. Therefore, in a display device 65 to which the anti-glare sheet 10 is applied, the contours of an image formed by the display element 66 can be clearly observed while suppressing reflection of the background. In a display device 65 to which the anti-glare sheet 10 is applied, it is possible to prevent the image displayed by the display device 65 from becoming cloudy. The viewer can observe a high-contrast, high-quality image.

[0236] <<<Anti-glare Article>>> The anti-glare sheet 10 according to this embodiment can be used in a variety of applications. FIG. 7 shows an anti-glare article 70 to which the anti-glare sheet 10 is applied. The anti-glare article 70 includes the anti-glare sheet 10 and a bonded article 71 to which the anti-glare sheet 10 is bonded. The anti-glare sheet 10 is overlaid on the bonded article 71 with its second surface 12 facing the bonded article 71. The anti-glare sheet 10 may be bonded to the bonded article 71 via a bonding layer containing an adhesive, a pressure-sensitive adhesive, or the like. Examples of the bonded article 71 include an instrument panel, a clock, a showcase, a show window, a window, and a front panel of a display device. The bonded article 71 may be a transparent substrate such as glass or a resin film.

[0237] The present disclosure will be described in more detail with reference to examples, but the present disclosure is not limited to the following examples.

[0238] <<<<1. Preparation of Antiglare Sheets>>> Antiglare sheets according to Examples 1 to 16 and Comparative Examples 1 to 7 were prepared.

[0239] <<Example 1>> A biaxially stretched polyethylene terephthalate film having a thickness of 38 μm was used as a substrate. This substrate was a product name "Cosmoshine A4360" manufactured by Toyobo Co., Ltd. The retardation of the substrate was 2000 nm (thickness 38 μm).

[0240] Antiglare layer coating solution 1 having the following formulation was applied to a substrate to form a coating film of antiglare layer coating solution 1 on the substrate. Next, the coating film was dried at 70°C and an air speed of 5 m / s for 30 seconds. Thereafter, the coating film was dried in a nitrogen atmosphere with an oxygen concentration of 200 ppm or less, with an integrated light dose of 100 mJ / cm. ２ The coating film was irradiated with ultraviolet light of 1000 kJ / cm. An antiglare layer made of the cured coating film was formed on the substrate, thereby obtaining an antiglare sheet of Example 1. The thickness of the antiglare layer was 2.5 μm.

[0241] <Anti-glare layer coating solution 1> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 11.5 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 5.2 parts by mass (octylsilane treatment; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone-based leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone-based leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KP-420) Solvent (toluene) 96.9 parts by mass Solvent (isopropyl alcohol) 67.6 parts by mass Solvent (methyl isobutyl ketone) 60.9 parts by mass

[0242] <<Example 2>> Example 2 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 2, and otherwise the antiglare sheet of Example 2 was obtained using the same materials and method as in Example 1.

[0243] <Anti-glare layer coating solution 2> Pentaerythritol triacrylate 70 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Pentaerythritol tetraacrylate 30 parts by mass (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-TMMT) Silica particles 10.5 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 6.3 parts by mass (octylsilane treated; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KP-420) Solvent (toluene) 79.0 parts by mass Solvent (isopropyl alcohol) 79.0 parts by mass Solvent (methyl isobutyl ketone) 67.7 parts by mass

[0244] <<Example 3>> Example 3 differs from the above-described Example 1 in that antiglare layer coating liquid 1 was changed to the following antiglare layer coating liquid 3, and the substrate was changed. Otherwise, the antiglare sheet of Example 2 was obtained using the same materials and method as the above-described Example 1. A 40 μm-thick triacetyl cellulose resin film was used as the substrate for Example 3. This substrate was a product name "TD40UL" manufactured by Fujifilm Corporation.

[0245] <Anti-glare layer coating solution 3> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 12.0 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 4.5 parts by mass (octylsilane treatment; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 907) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KP-420) Solvent (toluene) 79.0 parts by mass Solvent (isopropyl alcohol) 79.0 parts by mass Solvent (methyl isobutyl ketone) 67.7 parts by mass

[0246] <<Example 4>> In Example 4, the integrated light amount of UV irradiation was 50 mJ / cm ２ The antiglare sheet of Example 4 was obtained using the same materials and method as in Example 1, except that it differs from Example 1 described above in that:

[0247] Example 5 Example 5 differs from Example 1 above in that the substrate was changed, but the antiglare sheet of Example 5 was obtained using the same materials and method as Example 1. A biaxially oriented polyethylene terephthalate film having a thickness of 75 μm was used as the substrate of Example 5. This substrate was a product name "Cosmoshine A4360" manufactured by Toyobo Co., Ltd.

[0248] Example 6 Example 6 differs from Example 1 in that antiglare layer coating solution 1 was changed to the above-described antiglare layer coating solution 3 and that the substrate was changed. An antiglare sheet of Example 6 was obtained using the same materials and method as in Example 1. A 60 μm-thick triacetyl cellulose resin film was used as the substrate for Example 6. This substrate was a product name "TD60UL" manufactured by Fujifilm Corporation.

[0249] Example 7 Example 7 differs from Example 1 in that antiglare layer coating solution 1 was replaced with antiglare layer coating solution 3 and the substrate was changed, but the antiglare sheet of Example 7 was obtained using the same materials and method as Example 1. An 80 μm-thick triacetyl cellulose resin film was used as the substrate for Example 7. This substrate was a product name "TD80UL" manufactured by Fujifilm Corporation.

[0250] <<Example 8>> In Example 8, the antiglare layer coating solution 1 was changed to the antiglare layer coating solution 3 described above, the substrate was changed, and the integrated light amount of UV irradiation was changed to 50 mJ / cm ２ The antiglare sheet of Example 8 differed from that of Example 1 described above in that the antiglare sheet of Example 8 was obtained using the same materials and the same method as in Example 1. A triacetyl cellulose resin film having a thickness of 40 μm was used as the substrate of Example 8. This substrate was a product name "TD40UL" manufactured by Fujifilm Corporation.

[0251] Example 9 differs from Example 1 in that antiglare layer coating solution 1 was changed to the above-described antiglare layer coating solution 2 and that the substrate was changed, but the antiglare sheet of Example 9 was obtained using the same materials and in the same manner as Example 1. A polymethyl methacrylate resin film with a thickness of 75 μm was used as the substrate of Example 9.

[0252] <<Example 10>> Example 10 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 4, and otherwise the antiglare sheet of Example 10 was obtained using the same materials and method as in Example 1.

[0253] <Anti-glare layer coating solution 4> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 11.5 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 5.9 parts by mass (octylsilane treatment; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone-based leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone-based leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KP-420) Solvent (toluene) 97.5 parts by mass Solvent (isopropyl alcohol) 68.0 parts by mass Solvent (methyl isobutyl ketone) 61.2 parts by mass

[0254] <<Example 11>> Example 11 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 5, and otherwise the antiglare sheet of Example 11 was obtained using the same materials and the same method as in Example 1.

[0255] <Anti-glare layer coating solution 5> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 11.5 parts by mass (average particle size 2.0 μm, gel-process amorphous silica) Fumed silica 4.5 parts by mass (octylsilane-treated; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Organic fine particles 1.0 part by mass (non-hydrophilic-treated acrylic-styrene copolymer particles, average particle size 2.0 μm, refractive index 1.55, manufactured by Sekisui Plastics Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KP-420) Solvent (toluene) 96.4 parts by mass Solvent (isopropyl alcohol) 67.3 parts by mass Solvent (methyl isobutyl ketone) 60.5 parts by mass

[0256] <<Example 12>> Example 12 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 6, and otherwise the antiglare sheet of Example 12 was obtained using the same materials and method as in Example 1.

[0257] <Anti-glare layer coating solution 6> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 13.0 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 5.0 parts by mass (octylsilane treatment; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone-based leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone-based leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., product name: KP-420) Solvent (toluene) 97.9 parts by mass Solvent (isopropyl alcohol) 68.3 parts by mass Solvent (methyl isobutyl ketone) 61.5 parts by mass

[0258] <<Example 13>> Example 13 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 7, and otherwise the antiglare sheet of Example 13 was obtained using the same materials and method as in Example 1.

[0259] <Anti-glare layer coating solution 7> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 10.0 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 5.0 parts by mass (octylsilane treated; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Solvent (toluene) 95.7 parts by mass Solvent (isopropyl alcohol) 66.8 parts by mass Solvent (methyl isobutyl ketone) 60.1 parts by mass

[0260] <<Example 14>> In Example 14, the integrated amount of UV irradiation was 150 mJ / cm ２ The antiglare sheet of Example 14 differs from that of Example 1 described above in that the above-mentioned antiglare sheet was obtained using the same materials and the same method as those of Example 1.

[0261] <<Example 15>> Example 15 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 8, and otherwise the antiglare sheet of Example 15 was obtained using the same materials and method as in Example 1.

[0262] <Anti-glare layer coating solution 8> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 3.9 parts by mass (average particle size 4.1 μm, gel method amorphous silica) Silica particles 3.1 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 3.0 parts by mass (octylsilane-treated; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KP-420) Solvent (toluene) 82.7 parts by mass Solvent (isopropyl alcohol) 24.5 parts by mass Solvent (methyl isobutyl ketone) 45.9 parts by mass

[0263] <<Example 16>> Example 16 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 9, and otherwise the antiglare sheet of Example 16 was obtained using the same materials and method as in Example 1.

[0264] <Anti-glare layer coating solution 9> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 3.9 parts by mass (average particle size 4.1 μm, gel method amorphous silica) Silica particles 3.1 parts by mass (average particle size 2.0 μm, gel method amorphous silica) Fumed silica 3.0 parts by mass (octylsilane-treated; average primary particle size 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 10 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone-based leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Silicone leveling agent 0.5 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KP-420) Solvent (toluene) 72.0 parts by mass Solvent (isopropyl alcohol) 22.5 parts by mass Solvent (methyl isobutyl ketone) 45.9 parts by mass

[0265] <<Comparative Example 1>> Comparative Example 1 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 21, and otherwise the antiglare sheet of Comparative Example 1 was obtained using the same materials and method as in Example 1.

[0266] <Anti-glare layer coating liquid 21> Pentaerythritol triacrylate 100 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Silica particles 14.0 parts by mass (average particle size 4.1 μm) (gel method amorphous silica) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Silicone leveling agent 0.2 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Solvent (toluene) 150 parts by mass Solvent (isopropyl alcohol) 35.0 parts by mass Solvent (ethyl acetate) 5.2 parts by mass

[0267] Comparative Example 2 differs from Example 1 in that antiglare layer coating solution 1 was replaced with antiglare layer coating solution 21 and the substrate was changed. An antiglare sheet for Comparative Example 2 was obtained using the same materials and method as in Example 1. A 40 μm-thick triacetyl cellulose resin film was used as the substrate for Comparative Example 2. This substrate was a product name "TD40UL" manufactured by Fujifilm Corporation.

[0268] <<Comparative Example 3>> Comparative Example 3 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 22, and the film thickness of the antiglare layer was changed to 5.0 μm. Otherwise, the antiglare sheet of Comparative Example 3 was obtained using the same materials and the same method as in Example 1.

[0269] <Anti-glare layer coating solution 22> Pentaerythritol triacrylate 12 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Pentaerythritol tetraacrylate 54 parts by mass (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: A-TMMT) Isocyanuric acid EO-modified di- and triacrylate 34 parts by mass (manufactured by Toagosei Co., Ltd., trade name: M-313) Fumed silica 5.3 parts by mass (octylsilane-treated; average primary particle diameter 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Organic fine particles 9 parts by mass (non-hydrophilic-treated acrylic-styrene copolymer particles, average particle diameter 3.5 μm, refractive index 1.55, manufactured by Sekisui Plastics Co., Ltd.) Organic fine particles 6 parts by mass (Non-hydrophilic treated acrylic-styrene copolymer particles, average particle size 3.1 μm, refractive index 1.55, manufactured by Sekisui Plastics Co., Ltd.) Photopolymerization initiator 4 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 1 part by mass (manufactured by IGM Resins B.V., trade name: Omnirad 907) Photopolymerization initiator 5 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 127) Silicone leveling agent 0.6 parts by mass (manufactured by Momentive Performance Materials, trade name: TSF4460) Solvent (toluene) 93.2 parts by mass Solvent (isopropyl alcohol) 69.6 parts by mass Solvent (methyl isobutyl ketone) 69.6 parts by mass

[0270] <<Comparative Example 4>> Comparative Example 4 differs from Example 1 in that antiglare layer coating solution 1 was changed to the above-described antiglare layer coating solution 22, the substrate was changed, and the film thickness of the antiglare layer was changed to 5.0 μm. Otherwise, an antiglare sheet of Comparative Example 4 was obtained using the same materials and in the same manner as Example 1. A biaxially oriented polyethylene terephthalate film with a thickness of 75 μm was used as the substrate of Comparative Example 4. This substrate was a product name "Cosmoshine A4360" manufactured by Toyobo Co., Ltd.

[0271] Comparative Example 5 differs from Example 1 in that antiglare layer coating solution 1 was changed to antiglare layer coating solution 22, the substrate was changed, and the thickness of the antiglare layer was changed to 5.0 μm. Otherwise, an antiglare sheet of Comparative Example 5 was obtained using the same materials and method as Example 1. A 40 μm-thick triacetyl cellulose resin film was used as the substrate of Comparative Example 5. This substrate was a product name "TD40UL" manufactured by Fujifilm Corporation.

[0272] <<Comparative Example 6>> Comparative Example 6 differs from the above-described Example 1 in that antiglare layer coating solution 1 was changed to the following antiglare layer coating solution 23, and the film thickness of the antiglare layer was changed to 6.0 μm. Otherwise, the antiglare sheet of Comparative Example 6 was obtained using the same materials and the same method as in Example 1.

[0273] <Anti-glare layer coating solution 23> Pentaerythritol triacrylate 26 parts by mass (manufactured by Nippon Kayaku Co., Ltd., trade name: KAYARAD-PET-30) Urethane acrylate oligomer 74 parts by mass (manufactured by DIC Corporation, trade name: V-4000BA) Fumed silica 2.3 parts by mass (octylsilane treated; average primary particle diameter 12 nm, manufactured by Nippon Aerosil Co., Ltd.) Organic fine particles 3.8 parts by mass (non-hydrophilized acrylic-styrene copolymer particles, average particle diameter 2.0 μm, refractive index 1.55, manufactured by Sekisui Plastics Co., Ltd.) Photopolymerization initiator 4 parts by mass (manufactured by IGM Resins B.V., trade name: Omnirad 184) Photopolymerization initiator 6 parts by mass (IGM Resins B.V., trade name: Omnirad 184) (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: Omnirad 907) Silicone leveling agent 0.6 parts by mass (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KP-420) Solvent (toluene) 75.0 parts by mass Solvent (isopropyl alcohol) 70.0 parts by mass Solvent (methyl isobutyl ketone) 46.7 parts by mass Solvent (butyl acetate) 14.8 parts by mass

[0274] <<Comparative Example 7>> Comparative Example 7 differs from Example 1 in that antiglare layer coating solution 1 was changed to the above-mentioned antiglare layer coating solution 23, the substrate was changed, and the film thickness of the antiglare layer was changed to 6.0 μm. Otherwise, an antiglare sheet of Comparative Example 7 was obtained using the same materials and in the same manner as Example 1. A biaxially oriented polyethylene terephthalate film with a thickness of 75 μm was used as the substrate of Comparative Example 7. This substrate was a product name "Cosmoshine A4360" manufactured by Toyobo Co., Ltd.

[0275] <<<2. Measurement and Evaluation>>> Measurement and evaluation were carried out on the antiglare sheets according to the examples and comparative examples as described below. The measurement environment for each measurement and evaluation was a temperature of 23°C ± 2°C and a relative humidity of 50% ± 5%. Before starting each measurement and evaluation, the target sample was placed in the above-mentioned measurement environment for 16 hours.

[0276] <<2-1. Transmission Haze>> Samples measuring 10 cm x 10 cm were cut out from the antiglare sheets according to the Examples and Comparative Examples. The samples were visually inspected for the absence of any abnormalities such as dust or scratches. The transmission haze (%) of the antiglare sheets according to each Example was measured using the method described above. The transmission haze was measured using a haze meter "HM-150" manufactured by Murakami Color Research Laboratory. The measurement results of transmission haze are shown in the "Hz" column of Table 1A and Table 1B.

[0277] <<2-2. Internal Haze and External Haze>> Samples measuring 10 cm x 10 cm were cut out from the antiglare sheets according to the examples and comparative examples. The samples were visually inspected for the absence of any abnormalities such as dust or scratches. Measurement samples for measuring internal haze were prepared using the above-described method using a transparent adhesive and a triacetyl cellulose film. The transmission haze was measured for each of the prepared measurement samples. The internal haze was measured using a haze meter "HM-150" manufactured by Murakami Color Research Laboratory. The measurement results for internal haze are shown in "I Hz" in Tables 1A and 1B.

[0278] The ratio of internal haze to transmission haze is entered as "I Hz / Hz" in Tables 1A and 1B. The value entered as "I Hz / Hz" was calculated by dividing the measurement result of internal haze shown in Tables 1A and 1B by the measurement result of transmission haze.

[0279] The external haze (%) was calculated from the measured values ​​of transmission haze and internal haze for the antiglare sheets according to the examples and comparative examples. The external haze is shown as "0 Hz" in Tables 1A and 1B. The external haze was calculated by subtracting the measurement result of internal haze from the measurement result of transmission haze shown in Tables 1A and 1B.

[0280] <<2-3. Total Light Transmittance>> Samples measuring 10 cm x 10 cm were cut out from the anti-glare sheets according to the Examples and Comparative Examples. The samples were visually inspected for the absence of any abnormalities such as dust or scratches. The total light transmittance (%) of the anti-glare sheets according to each Example was measured using the method described above. The total light transmittance was measured using a haze meter "HM-150" manufactured by Murakami Color Research Laboratory. The measurement results of the total light transmittance are shown as "Tt" in Table 1A and Table 1B.

[0281] <<2-4. Image clarity>> Samples measuring 10 cm x 10 cm were cut out from the antiglare sheets according to the examples and comparative examples. The samples were visually inspected for the absence of any abnormalities such as dust or scratches. The image clarity of the antiglare sheets according to each example was measured using the method described above. Measurement results were obtained for image clarity C (0.125) using an optical comb with a width of 0.125, image clarity C (0.5) using an optical comb with a width of 0.5, image clarity C (1.0) using an optical comb with a width of 1.0, and image clarity C (2.0) using an optical comb with a width of 2.0. An image clarity measuring instrument "ICM-1T" manufactured by Suga Test Instruments Co., Ltd. The measurement results for image clarity C(0.125), image clarity C(0.5), image clarity C(1.0), and image clarity C(2.0) are shown in the columns "C(0.125)", "C(0.5)", "C(1.0)", and "C(2.0)" in Table 2A and Table 2B, respectively.

[0282] The "Ratio," "Difference," and "Difference / Average" in Tables 2A and 2B respectively show the image clarity ratio, image clarity difference, and ratio of the image clarity difference to the image clarity average, calculated from the image clarity measurement values. The image clarity ratio is the ratio of image clarity C (0.125) to image clarity C (2.0). The image clarity ratio is obtained by dividing image clarity C (0.125) by image clarity C (2.0). The image clarity difference is obtained by subtracting image clarity C (0.125) from image clarity C (2.0). The image clarity average is the average value of image clarity C (2.0) and image clarity C (0.125).

[0283] "SD," "CV," and "Total" in Tables 2A and 2B respectively show the standard deviation SD of image clarity, the coefficient of variation CV of image clarity, and the total value of image clarity. The standard deviation SD of image clarity is the standard deviation of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125). The coefficient of variation CV of image clarity is the coefficient of variation of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125). The coefficient of variation is obtained by dividing the standard deviation by the mean. The coefficient of variation CV of image clarity is obtained by dividing the standard deviation of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125) by the average of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125). The total image clarity is the sum of image clarity C(2.0), image clarity C(1.0), image clarity C(0.5), and image clarity C(0.125).

[0284] <<2-5. Specular Gloss>> Samples measuring 10 cm x 10 cm were cut out from the antiglare sheets according to the examples and comparative examples. The samples were visually inspected for the absence of any abnormalities such as dust or scratches. As described above, a black plate was attached to the second surface of the sample using an optically transparent adhesive sheet. The optically transparent adhesive sheet was "Panaclean PD-S1" manufactured by Panac Corporation. The black plate was "Comoglass 502K (black)" manufactured by Kuraray Co., Ltd. The specular gloss of the antiglare sheets according to each example was measured using the method described above. The measurement results for the specular gloss Gs(20) at an incident angle of 20° were obtained. The measurement results are shown in the "Gs(20)" column in Tables 1A and 1B. A gloss meter "GM-1" manufactured by Suga Test Instruments Co., Ltd. was used to measure the specular gloss.

[0285] <<2-6. Glare Degree>> The glare degree of the antiglare sheets according to the examples and comparative examples was measured. The measurement results of the glare degree are shown in the "Glare Degree" column in Table 1A and Table 1B. The glare degree was measured as follows.

[0286] As shown in FIG. 8 , a sample for evaluating glare was prepared by bonding the second surface of the antiglare sheet and the surface of the black matrix 300 (glass thickness 0.7 mm, pixel density of the black matrix equivalent to 200 ppi) on which the matrix was not formed via a transparent adhesive layer 200 (25 μm thick, Panac Clean PD-S1 manufactured by Panac) in a manner to minimize wrinkles, stains such as fingerprints, dust, and air bubbles.

[0287] In a dark room, a white surface light source 500 (HAKUBA Corporation, LIGHTBOX, average luminance 1000 cd / m) was attached to the black matrix side of the evaluation sample. ２ ) was irradiated with light from a CCD camera 600 (KP-M1, C-mount adapter, close-up ring: PK-11A Nikon, camera lens: 50 mm, F1.4s NIKKOR) to generate artificial glare. The distance between the white surface light source 500 and the black matrix 300 was 70 mm, and the distance between the CCD camera 600 and the first surface 11 of the anti-glare sheet of the evaluation sample was 200 mm, and the focus of the CCD camera was adjusted to match the anti-glare sheet. Figure 8 is a schematic diagram showing the measurement performed as described above.

[0288] Using image processing software (ImagePro Plus ver. 6.2; Media Cybernetics), images captured with the CCD camera were imported into a personal computer via an image board (Pro-Series Capture Kit Spectrim Pro for Windows 2000 & XP Pro Version 5.1), and image data consisting of a collection of pixel brightness values ​​was obtained. The software was then used for analysis as follows: During import, the captured screen data displayed under Menu → Import → Video / Digital was set to brightness 32, contrast 40, hue 32, and saturation 32, with the other parameters remaining at their default settings.

[0289] First, an evaluation area of ​​200 × 160 pixels (10 mm × 8 mm on the sample) was selected from the captured image data, and the evaluation area was converted to 16-bit grayscale. Next, a low-pass filter was selected from the enhancement tab of the filter command, and a filter was applied under the conditions of "3 × 3, number of times 3, strength 10." This removed components derived from the black matrix pattern. Next, flattening was selected, and shading correction was performed under the conditions of "background: dark, object width 10." Next, contrast enhancement was performed using the contrast enhancement command with "contrast: 96, brightness: 48." The obtained image data was converted to 8-bit grayscale (256 levels of grayscale). In other words, the obtained image data was converted to 256 levels of brightness (unitless, as it is a converted value) with a maximum value of 255 and a minimum value of 0. For the obtained image data, the standard deviation of the brightness of each pixel was calculated for a 150 × 110 pixel (= 16,500 pixels) area, and this value was used as the glare value. The luminance of the light source was adjusted so that the average luminance of this region was 120 to 140.

[0290] <<2-7. Sensory Evaluation of Visibility>> Samples measuring 12 cm x 12 cm were cut out from the antiglare sheets according to the examples and comparative examples. The samples were attached to a display element using a transparent adhesive medium. Specifically, the display element was manufactured by Sony Corporation under the product name "Xperia (registered trademark) Z5 E6653." The transparent adhesive medium was manufactured by Fujicopian Co., Ltd. under the product name "FIXFILM HGA2." The transparent adhesive medium included a transparent adsorption layer, a 50 μm-thick transparent substrate, and a transparent adhesive layer, in this order. The adsorption layer of the transparent adhesive medium was bonded to the image-forming surface of the display element. The adhesive layer of the transparent adhesive medium was bonded to the second surface of the antiglare sheet. The first surface of the measurement sample was visually inspected for any abnormalities, such as dust or scratches.

[0291] The sample attached to the display element was placed on a horizontal stand 70 cm high with the first surface facing upward. In a bright room environment, the image displayed by the display element was viewed through an anti-glare sheet. A lighting device was placed 2 m vertically above the horizontal stand. The light-emitting unit of the lighting device was an Hf32-type straight-tube, three-wavelength, daylight white fluorescent lamp. The illuminance on the first surface of the measurement sample was 500 lux to 1,000 lux. The evaluators' line of sight was approximately 160 cm from the floor. The evaluators were 20 healthy individuals in their 30s with visual acuity of 0.7 or higher. The observation results were evaluated according to the following evaluation criteria. The evaluation results are shown in the "Visibility" column of Tables 1A and 1B. A rating of "A" was considered acceptable in a normal product inspection. A rating of "C" was considered unacceptable in a normal product inspection.

[0292] <Evaluation criteria> A: 13 or more evaluators felt no glare, cloudiness, or unclear image. B: 8 to 12 evaluators felt no glare, cloudiness, or unclear image. C: 7 or less evaluators felt no glare, cloudiness, or unclear image.

[0293] <<2-8. Sensory Evaluation of Antiglare Properties>> Samples measuring 12 cm x 12 cm were cut out from the antiglare sheets according to the Examples and Comparative Examples. A black plate (10 cm x 10 cm) was attached to the second surface of the sample to be evaluated in each Example via an optically transparent adhesive sheet. The optically transparent adhesive sheet was "Panaclean PD-S1" manufactured by Panac Corporation. The black plate was "Comoglass 502K (black)" manufactured by Kuraray Co., Ltd. The first surface of the evaluation sample prepared by attaching the black plate was visually inspected for the absence of any abnormalities such as dust or scratches.

[0294] The evaluation sample was placed on a horizontal table 70 cm high with the first surface facing upward. In a bright room environment, an evaluator observed the reflection of the lighting device from an angle corresponding to the direction of regular reflection of the illumination light from the lighting device. The position of the evaluation sample relative to the lighting device was adjusted so that the angle of incidence of the illumination light emitted from the center of the lighting device on the evaluation sample was 10°. The light-emitting unit of the lighting device was an Hf32 straight-tube, three-wavelength, daylight white fluorescent lamp. The lighting device was positioned 2 m vertically above the horizontal table. The illuminance on the first surface of the evaluation sample was 500 lux to 1,000 lux. The evaluators' line of sight was approximately 160 cm from the floor. The evaluators were 20 healthy individuals in their 30s with visual acuity of 0.7 or higher. The observation results of the first surface of the evaluation sample in the area where the black board was attached were evaluated according to the following evaluation criteria. The evaluation results are shown in the "Anti-Glare Property" column of Tables 1A and 1B. A rating of "A" was deemed acceptable in a normal product inspection, whereas a rating of "C" was deemed unacceptable in a normal product inspection.

[0295] <Evaluation criteria> A: 13 or more evaluators were unable to distinguish the outline of the lighting device or its position. B: 12 ​​or fewer evaluators were unable to distinguish the outline of the lighting device or its position. Of the evaluators who were able to distinguish the outline of the lighting device and its position, less than half were able to clearly distinguish the outline of the lighting device. C: 12 or fewer evaluators were unable to distinguish the outline of the lighting device or its position. Of the evaluators who were able to distinguish the outline of the lighting device and its position, more than half were able to clearly distinguish the outline of the lighting device.

[0296]

[0297]

[0298]

[0299]

[0300] D1: first direction, D2: second direction, D3: third direction, 5: sheet article, 6: winding core, 7: roll, RA: winding axis, 10: anti-glare sheet, 11: first surface, 11X: uneven surface, 12: second surface, 20: substrate, 30: anti-glare layer, 31: first surface, 31X: uneven surface, 32: second surface, 36: binder resin, 37: particles, 40: functional layer, 50: second functional layer, 60: polarizing plate, 61: first protective sheet, 62: polarizer, 63: second protective sheet, 65: display device, 66: display element, 66a: image forming surface, 70: anti-glare article, 71: bonded article, 75: display element, 75a: image forming surface, 76: transparent adhesive medium, 77: CCD camera

Claims

1. An anti-glare sheet including a first surface and a second surface opposing each other in a first direction, comprising an anti-glare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, a ratio of image clarity C(0.125) measured by a transmission method using an optical comb having a width of 0.125 mm to image clarity C(2.0) measured by a transmission method using an optical comb having a width of 2.0 mm being 0.70 or more, and a transmission haze being 15% or more and 40% or less.

2. The antiglare sheet according to claim 1, wherein the external haze is greater than 14% and less than or equal to 35%.

3. An anti-glare sheet including a first surface and a second surface opposing each other in a first direction, comprising an anti-glare layer including a textured surface, the textured surface facing the opposite side to the second surface in the first direction, a ratio of image clarity C(0.125) measured by a transmission method using an optical comb having a width of 0.125 mm to image clarity C(2.0) measured by a transmission method using an optical comb having a width of 2.0 mm being 0.25 or more, a transmission haze being 15% or more and 40% or less, and an external haze being greater than 14% and 35% or less.

4. An antiglare sheet according to any one of claims 1 to 3, wherein the ratio of the value obtained by subtracting the image clarity C(0.125) from the image clarity C(2.0) to the average of the image clarity C(2.0) and the image clarity C(0.125) is 1.00 or less.

5. An anti-glare sheet according to any one of claims 1 to 3, wherein the coefficient of variation among the image clarity C(2.0), the image clarity C(1.0) measured by a transmission method using an optical comb having a width of 1.0 mm, the image clarity C(0.5) measured by a transmission method using an optical comb having a width of 0.5 mm, and the image clarity C(0.125) is 0.70 or less.

6. An antiglare sheet according to any one of claims 1 to 3, wherein the image clarity C(2.0) is 30% or more and 65% or less.

7. An antiglare sheet according to any one of claims 1 to 3, wherein the image clarity C(0.125) is 5% or more and 65% or less.

8. An anti-glare sheet according to any one of claims 1 to 3, wherein the sum of the image clarity C(2.0), the image clarity C(1.0) in a transmission method using an optical comb having a width of 1.0 mm, the image clarity C(1.0) in a transmission method using an optical comb having a width of 0.5 mm, and the image clarity C(0.125) is 50% or more and 235% or less.

9. The antiglare sheet according to any one of claims 1 to 3, which has an internal haze of 5% or less.

10. The antiglare sheet according to any one of claims 1 to 3, wherein the ratio of internal haze to transmission haze is 0.20 or less.

11. The antiglare sheet according to any one of claims 1 to 3, wherein the antiglare layer contains a binder resin and particles, and the binder resin contains a cured resin.

12. A sheet article comprising a plurality of antiglare sheets according to any one of claims 1 to 3.

13. The sheet article of claim 12, wound about a winding axis.

14. A polarizing plate comprising: an antiglare sheet according to any one of claims 1 to 3; and a polarizer superimposed on the antiglare sheet.

15. A display device comprising: an antiglare sheet according to any one of claims 1 to 3; and a display element superimposed on the antiglare sheet.

16. An anti-glare article comprising: an article to be joined; and the anti-glare sheet according to any one of claims 1 to 3 joined to the article to be joined.

Images