Anti-glare cover manufacturing method, OLED display unit manufacturing method, Anti-glare cover, and OLED display unit

Abstract

This anti-glare cover manufacturing method involves manufacturing for an anti-glare cover to be provided on an image display surface of an organic light emitting diode (OLED) display. The anti-glare cover comprises: an anti-glare substrate having a recess-and-projection surface on the side opposite to the image display surface of the OLED display; and a light-scattering layer disposed between the anti-glare substrate and the OLED display. The manufacturing method comprises: selecting a combination of the antiglare substrate and the light-scattering layer, which satisfies formula (1), formula (2), and formula (3) in the description; and forming the antiglare substrate and the light scattering layer according to the selected combination.

Description

Method for manufacturing an anti-glare cover, method for manufacturing an OLED display unit, anti-glare cover, and OLED display unit

[0001] The present disclosure relates to a method for manufacturing an anti-glare cover, a method for manufacturing an OLED display unit, an anti-glare cover, and an OLED display unit.

[0002] Displays such as liquid crystal displays have an image display surface on which images are displayed. It has been studied to suppress specular reflection of external light from the image display surface and thus prevent glare from the external light by disposing an anti-glare film on the image display surface.

[0003] The antiglare film described in Patent Document 1 includes a first resin layer and a second resin layer. The first resin layer is formed from a light-transmitting resin containing fine particles. The second resin layer is formed from a light-transmitting resin having an uneven surface on the side opposite to the first resin layer.

[0004] The second resin layer described in Patent Document 1 has an uneven surface that diffuses reflected light and suppresses external light from being reflected in. However, forming an uneven surface on the second resin layer causes a phenomenon called glare.

[0005] Glare occurs when the unevenness acts as a tiny lens. Glare is likely to occur when the focal point of the lens coincides with the position of the display pixel. It has also been thought that the higher the pixel density, the more likely glare is to occur.

[0006] The first resin layer described in Patent Document 1 contains fine particles inside a light-transmitting resin, and the fine particles scatter transmitted light, thereby suppressing glare in the image.

[0007] Japanese Patent Application Publication No. 2007-101912

[0008] Organic Light Emitting Diode (OLED) displays are sometimes used instead of liquid crystal displays. While conventional antiglare films can suppress glare in images from liquid crystal displays, they sometimes cannot suppress glare in images from OLED displays.

[0009] To suppress glare in an image, it is effective to scatter transmitted light with a light-scattering layer, as in Patent Document 1. However, scattering transmitted light may cause white blurring of the image and a decrease in image clarity. Conventionally, the conditions under which glare, white blurring, and a decrease in image clarity can be suppressed in anti-glare covers for OLED displays have been unclear.

[0010] The inventors of the present application have found that the ratio of the light-emitting area of ​​a pixel has a much greater effect on glare than the pixel density, and that the smaller the ratio of the light-emitting area, the greater the glare of the image. Furthermore, they have found that, since the ratio of the light-emitting area is often smaller in OLED displays than in conventional liquid crystal displays, the glare of images in OLED displays is likely to be significantly greater.

[0011] One aspect of the present disclosure provides a technology for suppressing image sparkle, image white blurring, and reduction in image clarity in an anti-glare cover for an OLED display.

[0012] A method for manufacturing an anti-glare cover according to one aspect of the present disclosure is a method for manufacturing an anti-glare cover to be provided on an image display surface of an OLED (organic light emitting diode) display. The anti-glare cover includes an anti-glare substrate having an uneven surface on the surface opposite to the image display surface of the OLED display, and a light-scattering layer disposed between the anti-glare substrate and the OLED display. The OLED display has a plurality of pixels, each of which has a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light. The average value A0 of the total area of ​​each pixel and the average value A1 of the total light-emitting area of ​​all the green sub-pixels included in each pixel are calculated. Ｇ The difference ΔA Ｇ (ΔA Ｇ = A0 - A1 Ｇ ) ratio (ΔA Ｇ / A0) is 85% to 95%. The pixel density is 170 ppi to 650 ppi. The manufacturing method satisfies the following formulas (1), (2), and (3): Formula (1): S1×(a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 (in formula (1), a Ｓ is 6.28 x 10 －５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ and d Ｓ is 1.8.) Equation (2): M1 × d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 (In formula (2), a Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ and d Ｍ is 1.) Equation (3): C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 (in formula (3), a Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ and d Ｃ is 3.6.) The method includes selecting a combination of the antiglare substrate and the light-scattering layer, and forming the antiglare substrate and the light-scattering layer in the selected combination.

[0013] First glare index value S1: The anti-glare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the uneven surface facing upward. With only the green sub-pixels of the pixels emitting light, the image display surface of the OLED display is imaged through the anti-glare substrate using a camera on a D&MS SMS-1000 measuring device. The Sparkle value obtained by image analysis with the measuring device is the first glare index value S1. S1 is expressed as a percentage. The distance between the light-shielding plate attached to the camera and the anti-glare substrate is approximately 600 mm. The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16.

[0014] First discoloration index value M1: The antiglare substrate is placed horizontally on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. Using a Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is incident on the textured surface at an incident angle of 40°, and the bidirectional reflectance distribution function (BRDF) is measured at the incident plane (a plane containing the normal at the incident point and the incident light) at a reflection angle of 20°. The measured value of the BRDF is the first discoloration index value M1. The unit of M1 is (1 / sr).

[0015] First clarity index value C1: The antiglare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. With the OLED display displaying a stripe pattern consisting of alternating white and black lines, the stripe pattern is imaged through the antiglare substrate using a camera on a D&MS SMS-1000 measuring device. Each white line is formed by turning on two adjacent pixels in the width direction of the white line. Each black line is formed by turning off two adjacent pixels in the width direction of the black line. The intensity distribution of the image is measured, and the first clarity index value C1 is obtained by substituting the peak value Sp1 and valley value Sv1 of the intensity distribution into the following formula (4). C1 is expressed as a percentage. Equation (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) × 100 The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962. The focus of the lens is adjusted to the pixel of the OLED display.

[0016] Haze value H: The percentage of transmitted light that deviates from the incident light by 2.5° or more due to forward scattering among the transmitted light that passes through the light scattering layer in the thickness direction is the haze value H.

[0017] According to one aspect of the present disclosure, an anti-glare cover for an OLED display can suppress image sparkle, image white blurring, and a decrease in image clarity.

[0018] FIG. 1 is a cross-sectional view of an OLED display unit according to an embodiment. FIG. 2 is a flowchart showing an example of a method for manufacturing an anti-glare substrate. FIG. 3 is a cross-sectional view showing an example of a concave curved surface formed from a microcrack. FIG. 4 is a plan view showing an example of the configuration of a pixel of an OLED display. FIG. 5 is a diagram showing a ΔA Ｇ The relationship between / A0 and S1, and ΔA Ｂ1 is a diagram showing an example of the relationship between / A0 and S4. FIG. 6 is a diagram showing an example of a combination of an antiglare substrate and a light-scattering layer and its characteristic values. FIG. 7 is a diagram showing the relationship between S1 and S2 shown in FIG. 6 for each H. FIG. 8 is a diagram showing the relationship between H and the slope of the linear equation shown in FIG. 7. FIG. 9 is a diagram showing the relationship between M1 and M2 shown in FIG. 6 for each H. FIG. 10 is a diagram showing the relationship between H and the intercept of the linear equation shown in FIG. 9. FIG. 11 is a diagram showing the relationship between C1 and C2 shown in FIG. 6 for each H. FIG. 12 is a diagram showing the relationship between H and the slope of the linear equation shown in FIG. 11. FIG. 13 is a diagram showing predicted values ​​for each combination of an antiglare substrate and a light-scattering layer shown in FIG. 6.

[0019] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or corresponding components are denoted by the same reference numerals, and their description may be omitted. In the specification, the symbol "to" indicating a range of values ​​means that the values ​​before and after it are included as the lower and upper limits. The range of values ​​includes the range rounded up or down.

[0020] An OLED display unit 10 according to one embodiment will be described with reference to Figure 1. The OLED display unit 10 includes an OLED display 20 and an anti-glare cover 30. The OLED display 20 includes an image display surface 21 for displaying an image. The anti-glare cover 30 is provided on the image display surface 21 of the OLED display 20 and suppresses specular reflection of external light, thereby suppressing glare from the external light.

[0021] The anti-glare cover 30 includes an anti-glare substrate 40 and a light-scattering layer 50 disposed between the anti-glare substrate 40 and the OLED display 20. The anti-glare substrate 40 has an uneven surface 41a on a surface 41 opposite to the image display surface 21 of the OLED display 20. The uneven surface 41a is formed on at least a portion of the surface 41. The uneven surface 41a diffuses reflected light and suppresses glare from external light.

[0022] The antiglare substrate 40 is, for example, a glass substrate, and the uneven surface 41a is formed of glass. The glass may be, for example, aluminosilicate glass, alkali aluminosilicate glass, soda-lime glass, borosilicate glass, phosphosilicate glass, alkali aluminoborosilicate glass, lead glass, alkali barium glass, or aluminoborosilicate glass. Specific examples of the glass include the following glasses (i) to (v):

[0023] (i) In mole percent on an oxide basis, SiO ２ 50% to 80%, Al ２ O ３ 0% to 26%, Na ２ O is 1% to 25%, B ２ O ３ 0% to 10%, K ２ Glass containing 0 to 20% of O, 0 to 20% of MgO, and 0 to 15% of CaO.

[0024] (ii) In mole percent on an oxide basis, SiO ２ 50% to 80%, Al ２ O ３ 2% to 25%, Li ２ O from 0% to 10%, Na ２ O 0% to 18%, K ２ O 0% to 10%, MgO 0% to 15%, CaO 0% to 5%, ZrO ２ Glass containing 0% to 5% of each of the above.

[0025] (iii) In mole percent on an oxide basis, SiO ２ 50% to 74%, Al ２ O ３ 1% to 10%, Na ２ O 6% to 14%, K ２ O 3% to 11%, MgO 2% to 15%, CaO 0% to 6%, ZrO ２ Each of these contains 0% to 5% of SiO ２ and AlO ３ The total content of is 75% or less, Na ２ O and K ２ A glass having a total content of O of 12% to 25%, and a total content of MgO and CaO of 7% to 15%.

[0026] (iv) In mole percent on an oxide basis, SiO ２ 68% to 80%, Al ２ O ３ 4% to 10%, Na ２ O 5% to 15%, K ２ O 0% to 1%, MgO 4% to 15%, ZrO ２ Glass containing 0% to 1% of each of the above.

[0027] (v) In mole percent on an oxide basis, SiO ２ 67% to 75%, Al ２ O ３ 0% to 4%, Na ２ O 7% to 15%, K ２ O 1% to 9%, MgO 6% to 14%, ZrO ２ Each of these contains 0% to 1.5% of SiO ２ and Al ２ O ３ The total content of 71% to 75%, Na ２ O and K ２ A glass having a total O content of 12% to 20%, and if CaO is contained, the content thereof is less than 1%.

[0028] In this embodiment, the anti-glare substrate 40 is a glass substrate, but any substrate that transmits visible light may be used, for example, a resin substrate. Glass has better weather resistance and scratch resistance than resin. In this embodiment, the anti-glare substrate 40 is a flat plate, but it may also be a curved plate. The thickness of the anti-glare substrate 40 is preferably 5 mm or less, and more preferably 3 mm or less. The thickness of the anti-glare substrate 40 is preferably 0.2 mm or more, and more preferably 0.3 mm or more.

[0029] An example of a method for manufacturing the antiglare substrate 40 will be described with reference to Fig. 2. The method for manufacturing the antiglare substrate 40 includes, for example, performing a wet blasting treatment (step S101) and a wet etching treatment (step S102) in this order on at least a portion of the surface 41 of the antiglare substrate 40 to obtain an uneven surface 41a. The method for forming the uneven surface 41a may be a general method and is not particularly limited. For example, a sandblasting treatment may be performed instead of the wet blasting treatment.

[0030] The manufacturing method of the antiglare substrate 40 may include processes other than steps S101 and S102. For example, the method may include subjecting the antiglare substrate 40 to a chemical strengthening process after step S102. The chemical strengthening process is a process for forming a compressive stress layer on the glass surface by ion exchange at a temperature below the glass transition point. The compressive stress layer is formed by exchanging alkali metal ions, which have a small ionic radius and are contained in the glass, for alkali ions, which have a larger ionic radius.

[0031] Step S101 includes performing a wet blasting treatment on at least a part of the surface 41 of the antiglare substrate 40. The wet blasting treatment is a process in which a slurry containing particles is sprayed from a nozzle by gas pressure and caused to collide with an object, thereby forming minute cracks (microcracks) in the object.

[0032] The slurry contains particles, which will be described later, and a dispersion medium. Examples of the dispersion medium include water, a water-soluble organic solvent, or a mixture of water and a water-soluble organic solvent. Examples of the water-soluble organic solvent include lower alcohols and ketones. Specific examples of lower alcohols include methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, and tert-butanol. Specific examples of ketones include acetone.

[0033] The slurry may also contain a dispersing aid. Examples of dispersing aids include carboxymethyl cellulose, polyacrylic acid derivatives or salts thereof, polycarboxylic acid derivatives or salts thereof, and polyureaurethane. Specific examples of polyacrylic acid derivatives or salts thereof include polyacrylic acid, ammonium polyacrylate, sodium polyacrylate, polyacrylamide, acrylic acid ester-acrylate copolymer, acrylamide-acrylate copolymer, or acrylic acid ester-acrylamide-acrylate copolymer. Specific examples of polycarboxylic acid derivatives or salts thereof include ammonium polycarboxylate or sodium polycarboxylate. The proportion of the dispersing aid in the slurry is preferably 0.03% by mass or more and 2.0% by mass or less.

[0034] From the viewpoint of processability, the particles contained in the slurry are preferably particles having a Mohs hardness higher than that of glass, and are preferably inorganic particles other than spherical particles. The material of the inorganic particles may be a metal (including alloys) or an inorganic compound. The inorganic compound may be a metal compound or a non-metal compound. Examples of metals include stainless steel, zinc, and copper. Examples of inorganic compounds include silica, glass, garnet, zirconia, alumina, silicon carbide, boron carbide, and CO. ２ (dry ice), etc. Among these, alumina is preferred. Commercially available products can be used as the particles contained in the slurry. An example of a commercially available product is white alumina manufactured by Fujimi Incorporated.

[0035] The particle concentration in the slurry is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, from the viewpoint of productivity, while the particle concentration in the slurry is preferably 30% by mass or less, more preferably 10% by mass or less, from the viewpoint of fluidity of the slurry.

[0036] The wet blasting process forms microcracks 411 in at least a portion of the surface 41, as shown in Fig. 3. Then, in step S102 (described later), the glass is isotropically etched starting from the microcracks 411, forming a concave surface 412, as shown in Fig. 3. In Fig. 3, the multiple dashed lines indicate changes in the surface shape of the glass over time. When the glass is isotropically etched, the depth D of the concave surface 412 becomes approximately the same as the depth of the microcracks 411.

[0037] The depth of the microcracks 411 varies depending on the particle size and other factors. The larger the particle size, the greater the impact of the particles, and the deeper the microcracks 411. The deeper the microcracks 411, the greater the area S of the concave curved surface 412 in plan view. Furthermore, the deeper the microcracks 411, the greater the depth D of the concave curved surface 412.

[0038] Step S102 includes performing a wet etching process on at least a portion of the surface 41 of the antiglare substrate 40. The wet etching process is a process in which an etching solution containing an acid or alkali is supplied to the surface 41 of the antiglare substrate 40 to form concave curved surfaces 412 starting from the microcracks 411. The etching solution may be supplied by a dipping method in which the glass plate is immersed in the etching solution, or by a spraying method in which the etching solution is applied to the glass plate. Compared to dry etching, the wet etching process can isotropically etch the glass.

[0039] The etching solution is, for example, a solution containing an acid. The acid concentration in the etching solution is preferably 1 to 15% by mass, and particularly preferably 3 to 10% by mass. As the acid, for example, hydrogen fluoride is used. A combination of hydrogen fluoride and hydrogen chloride may also be used.

[0040] When the etching solution is a solution containing an acid, etching is preferably carried out at a temperature of 10° C. or higher and 40° C. or lower, preferably 15° C. or higher and 35° C. or lower, for 2 minutes to 1 hour.

[0041] When the etching solution is a solution containing an acid, the etching rate is preferably 0.5 μm / min or more, more preferably 1.0 μm / min or more, and even more preferably 2.0 μm / min or more, from the viewpoint of ensuring a sufficient anti-glare effect. The etching rate is preferably 20 μm / min or less.

[0042] The etching solution may be a solution containing an alkali. The alkali concentration in the etching solution is preferably 1% by mass to 50% by mass, and more preferably 3% by mass to 50% by mass. As the alkali, for example, at least one base selected from sodium hydroxide, potassium hydroxide, potassium carbonate, and sodium carbonate is used. These bases may be used alone or in combination.

[0043] The etching solution preferably contains a chelating agent in addition to alkali. The chelating agent forms a chelate complex with metal ions of the glass dissolved in the etching solution, thereby suppressing recrystallization of the glass. The content of the chelating agent in the etching solution is preferably 0.1 mol / L or more and 0.5 mol / L or less. Examples of the chelating agent that can be used include ethylenediaminetetraacetic acid (EDTA), citric acid, gluconic acid, succinic acid, oxalic acid, tartaric acid, and hydroxyethylidene diphosphinic acid (HEDP).

[0044] When the etching solution is a solution containing an alkali, etching is preferably carried out at a temperature of 65° C. or higher and 150° C. or lower, preferably 80° C. or higher and 150° C. or lower, for 20 minutes to 40 hours.

[0045] When the etching solution is a solution containing an alkali, the etching rate is preferably 0.05 μm / min or more, more preferably 0.10 μm / min or more, and even more preferably 0.15 μm / min or more, from the viewpoint of ensuring a sufficient anti-glare effect. The etching rate is preferably 1.50 μm / min or less.

[0046] Incidentally, forming an uneven shape on the surface 41 of the anti-glare substrate 40 causes a phenomenon called glare. The glare occurs when the unevenness acts as a tiny lens. Glare in an image is likely to occur when the focal point of the lens coincides with the position of a pixel on the OLED display 20. It has also been thought that the higher the pixel density, the more likely glare in an image is to occur.

[0047] According to this embodiment, as will be described later, glare in an image can be suppressed even when the pixel density is 170 ppi or higher. The pixel density is, for example, 170 ppi or higher, preferably 200 ppi or higher, more preferably 250 ppi or higher, and particularly preferably 270 ppi or higher. Given the resolution limit of the human eye, the pixel density is, for example, 650 ppi or lower, preferably 400 ppi or lower, more preferably 350 ppi or lower, and even more preferably 300 ppi or lower.

[0048] The light-scattering layer 50 is disposed between the anti-glare substrate 40 and the OLED display 20, and scatters light transmitted from the OLED display 20 toward the anti-glare substrate 40, thereby suppressing glare on the image. The light-scattering layer 50 includes, for example, a resin layer 51 and a plurality of particles 52 dispersed within the resin layer 51. The resin layer 51 and the particles 52 have different refractive indices for visible light. The light-scattering layer 50 scatters transmitted light with the particles 52.

[0049] The light-scattering layer 50 may also serve as an adhesive layer that bonds the anti-glare substrate 40 and the OLED display 20. The light-scattering layer 50 may be, for example, an OCA (Optical Clear Adhesive). An example of a commercially available OCA is the optical adhesive "DA series" manufactured by Tomoegawa Manufacturing Co., Ltd. If the resin layer 51 has adhesiveness, the light-scattering layer 50 can also serve as an adhesive layer.

[0050] The resin layer 51 may be formed of any material that transmits visible light, and is not particularly limited thereto. For example, the resin layer 51 may be formed of a pressure-sensitive adhesive. It is also possible to use an ultraviolet-curable resin, a thermosetting resin, a thermoplastic resin, or a moisture-curable resin. The thickness of the resin layer 51 is preferably 5 μm to 500 μm. If the thickness of the resin layer 51 is 5 μm or more, the particles 52 easily scatter transmitted light, making it easier to suppress glare in the image. Furthermore, the particles 52 can be uniformly dispersed, making it easier to uniformly bond the OLED display 20 and the anti-glare substrate 40. If the thickness of the resin layer 51 is 500 μm or less, the haze value H of the light-scattering layer 50 is small, minimizing the reduction in image clarity due to an increase in the thickness of the light-scattering layer 50, and thus improving image clarity.

[0051] The particles 52 may be formed of either an inorganic material or an organic material. Examples of materials for the particles 52 include polymethyl methacrylate, silica, polystyrene, and metal oxides. The average particle size of the particles 52 is preferably 0.1 μm to 100 μm. If the average particle size of the particles 52 is 0.1 μm or more, the particles 52 easily scatter transmitted light, making it easy to suppress glare in the image. If the average particle size of the particles 52 is 100 μm or less, the haze value H of the light scattering layer 50 is small, and the image clarity is good.

[0052] The particle size distribution of the particles 52 is measured, for example, using an electrical resistance particle size distribution analyzer, Multisizer 4e, manufactured by Beckman Coulter, Inc. The particle size distribution obtained using the particle size distribution analyzer is based on the so-called "Coulter principle," in which impedance changes due to the passage of individual particles in an electrolyte solution through a measurement site are directly detected, the particle diameters of the individual particles are measured one by one as equivalent spherical diameters, and the resulting number distribution is organized as an integrated histogram (or integrated frequency curve) with particle diameter on the horizontal axis and number (frequency) on the vertical axis. The average particle diameter is calculated as the so-called arithmetic mean diameter according to the number distribution.

[0053] The haze value H of the light-scattering layer 50 is preferably 10% to 70%, more preferably 20% to 70%, even more preferably 30% to 70%, and particularly preferably 50% to 70%. The haze value H is determined as the percentage of transmitted light that deviates from the incident light by 2.5° or more due to forward scattering, out of the transmitted light that passes through the light-scattering layer 50 in the thickness direction. The smaller the haze value H, the better the image clarity. The haze value is measured in accordance with the Japanese Industrial Standards (JIS K7136:2000) using a C illuminant. An example of a commercially available device for measuring the haze value H is the haze meter (HM-65L2) manufactured by Murakami Color Research Laboratory Co., Ltd.

[0054] As shown in Fig. 4, the OLED display 20 has a plurality of pixels 22, each of which has a red subpixel 22R that emits red light, a green subpixel 22G that emits green light, and a blue subpixel 22B that emits blue light. Each pixel 22 has one or more red subpixels 22R, one or more green subpixels 22G, and one or more blue subpixels 22B. The arrangement and shape of the red subpixels 22R, green subpixels 22G, and blue subpixels 22B are not limited to those shown in Fig. 4 and may be any general arrangement and shape. Each pixel 22 may further have a subpixel that emits another color (e.g., yellow).

[0055] Unlike liquid crystal displays, in OLED displays 20, the light-emitting area of ​​the blue subpixel 22B is often larger than the light-emitting areas of the red subpixel 22R and green subpixel 22G. This is because blue light-emitting materials have a shorter lifespan and a faster decrease in luminance than red and green light-emitting materials. By increasing the light-emitting area of ​​the blue subpixel 22B, the decrease in luminance of the blue subpixel 22B can be delayed.

[0056] In a liquid crystal display, the blue, red, and green subpixels usually have the same light-emitting area, and it is common to make these areas equal and large in order to maximize the transmittance of backlight.

[0057] The inventors of the present application investigated why glare on an image of a liquid crystal display can be suppressed using a conventional anti-glare cover, but glare on an image of an OLED display 20 cannot be suppressed, and focused on the fact that the proportion of the light-emitting area of ​​the blue sub-pixel 22B is large. Because the proportion of the light-emitting area of ​​the blue sub-pixel 22B is large, the proportion of the light-emitting area of ​​the green sub-pixel 22G is small, and it is thought that glare on the image is likely to occur when the green sub-pixel 22G is lit.

[0058] The ratio of the light-emitting area of ​​the green subpixel 22G is (1-ΔA Ｇ / A0) or (ΔA Ｇ / A0). Ｇ The larger ΔA / A0 is, the smaller the proportion of the light-emitting area of ​​the green subpixel 22G. A0 is the average value of the total area of ​​each pixel 22. The total area of ​​one pixel 22 is the sum of the light-emitting area of ​​one pixel 22 and the non-light-emitting area of ​​one pixel 22. The light-emitting area of ​​one pixel 22 is the total area of ​​all subpixels (e.g., the red subpixel 22R, the green subpixel 22G, and the blue subpixel 22B) that make up one pixel 22. Ｇ A0 and A1 Ｇ The difference between (A0-A1 Ｇ ) A1 Ｇ is the average value of the total light-emitting area of ​​all the green sub-pixels 22G that constitute each pixel 22. When one pixel 22 has two green sub-pixels 22G, A1 Ｇ is the total light-emitting area of ​​the two green sub-pixels 22G.

[0059] Similarly, the ratio of the light-emitting area of ​​the blue subpixel 22B is (1-ΔA Ｂ / A0) or (ΔA Ｂ / A0). Ｂ The larger ΔA / A0 is, the smaller the proportion of the light-emitting area of ​​the blue subpixel 22B is. Ｂ A0 and A1 Ｂ The difference between (A0-A1 Ｂ ) A1 Ｂ is the average value of the total light-emitting area of ​​all the blue sub-pixels 22B constituting each pixel 22. When one pixel 22 has two blue sub-pixels 22B, A1 Ｂ is the total light-emitting area of ​​the two blue sub-pixels 22B.

[0060] The ratio of the light-emitting area of ​​the red subpixel 22R is (1-ΔA Ｒ / A0) or (ΔA Ｒ / A0). Ｒ The larger ΔA / A0 is, the smaller the proportion of the light-emitting area of ​​the red subpixel 22R is. Ｒ A0 and A1 Ｒ The difference between (A0-A1 Ｒ ) A1 Ｒ is the average value of the total light-emitting area of ​​all the red sub-pixels 22R constituting each pixel 22. When one pixel 22 has two red sub-pixels 22R, A1 Ｒ is the total light-emitting area of ​​the two red sub-pixels 22R.

[0061] In the case of an LCD display, ΔA Ｒ / A0, ΔA Ｇ / A0 and ΔA Ｂ / A0 is usually about 70 to 85%. Ｒ / A0, ΔA Ｇ / A0 and ΔA Ｂ On the other hand, in an OLED display, ΔA Ｒ / A0, ΔA Ｇ / A0 and ΔA Ｂ / A0 is 70% to 95%. Ｒ / A0 and ΔA Ｇ / A0 are approximately equal, and ΔA Ｂ / A0 is often larger.

[0062] As shown in FIG. Ｇ / A0 (%) and S1 (%) relationship, and ΔA ＢThe values ​​of A0 (%) and S4 (%) were measured. Specifically, three commercially available OLED displays with different pixel densities were prepared, and anti-glare covers of the same configuration were attached to each OLED display. The first glare index value S1 and the fourth glare index value S4 were measured. As will be described in detail later, the first glare index value S1 and the fourth glare index value S4 represent the degree of glare in an image of an OLED display unit 10 that does not include a light-scattering layer 50 but includes an anti-glare substrate 40. The first glare index value S1 is measured when only the green sub-pixel 22G of the pixel 22 is emitting light. The fourth glare index value S4 is measured when only the blue sub-pixel 22B of the pixel 22 is emitting light. The smaller the first glare index value S1 and the fourth glare index value S4, the smaller the glare in the image, making it easier for the viewer to observe the image.

[0063] The first glare index value S1 represents the degree of glare of an image displayed on the OLED display unit 10 when the anti-glare cover 30 has only the anti-glare substrate 40 without the light-scattering layer 50. The smaller the first glare index value S1, the less glare there is when a green image is displayed, making it easier for the viewer to observe the image. The method for measuring the first glare index value S1 is as follows: The anti-glare substrate 40 is placed on the image display surface 21 of the OLED display 20 without the light-scattering layer 50, with the textured surface 41a facing upward. With only the green sub-pixel 22G of the pixels 22 emitting light, the image display surface 21 of the OLED display 20 is imaged through the anti-glare substrate 40 using a camera on a D&MS SMS-1000 measuring device. The position of the anti-glare substrate 40 is shifted by 1.0 mm, and the image display surface 21 of the OLED display 20 is again imaged through the anti-glare substrate 40. Then, using the Difference Image Method (DIM) of the measuring device, 0 is input as the pixel ratio value, and the sparkle value obtained by image analysis is the first glare index value S1. S1 is expressed as a percentage. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962, and the focus of the camera lens is adjusted to the pixel 22 of the OLED display 20. In this case, the distance between the light shielding plate attached to the camera and the anti-glare substrate 40 is approximately 600 mm. The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. Furthermore, in order to accurately match the aperture to 16, the light intensity value (Intensity) and exposure time (Exposure Time) at the fully open aperture of 2.8 are recorded, and the exposure time is set to 32 times the exposure time at aperture 2.8 so that the aperture area becomes 1 / 32 of that at aperture 2.8, and the lens aperture is adjusted so that the light intensity value becomes the same as the light intensity value at aperture 2.8.

[0064] The fourth glare index value S4 represents the degree of glare of an image of the OLED display unit 10 when the anti-glare cover 30 has only the anti-glare substrate 40 without the light-scattering layer 50. The smaller the fourth glare index value S4, the less glare there is when a blue image is displayed, making it easier for the viewer to observe the image. The method for measuring the fourth glare index value S4 is the same as the method for measuring the first glare index value S1, except that an image of the image display surface 21 of the OLED display 20 is captured through the anti-glare substrate 40 using a camera of a measuring device SMS4000 manufactured by D&MS, with only the blue sub-pixel 22B of the pixel 22 emitting light. S4 is expressed as a percentage.

[0065] As shown in FIG. 5, "Display A" has a ΔA Ｇ / A0 and ΔA Ｂ / A0 was the same, and S1 and S4 were comparable. This shows that when the density of the pixels 22 is the same and the proportion of the light-emitting area is the same, the degree of glare of the image hardly depends on the color of the emitted light. Ｇ / A0 is ΔA Ｂ / A0, and S1 was larger than S4. This shows that even if the density of pixels 22 is the same, the smaller the proportion of the light-emitting area, the more likely glare will occur in the image. Furthermore, Figure 5 shows that the proportion of the light-emitting area has a greater effect on glare than the density of pixels 22.

[0066] In the OLED display 20, ΔA Ｇ / A0 is ΔA Ｂ / A0. This is because blue light-emitting materials have a shorter life span and a faster decrease in luminance than red and green light-emitting materials. Since the proportion of the light-emitting area of ​​the blue subpixel 22B is larger, the proportion of the light-emitting area of ​​the green subpixel 22G is smaller, and it is thought that glare is more likely to occur in an image when the green subpixel 22G is lit. For this reason, it is thought that glare is more likely to occur in an OLED display when the green subpixel 22G is lit than in a liquid crystal display.

[0067] To suppress glare in an image, it is effective to scatter transmitted light using the light-scattering layer 50. However, scattering transmitted light may cause white blurring of the image and a decrease in image clarity. Conventionally, the conditions under which glare, white blurring, and a decrease in image clarity can be suppressed in an anti-glare cover 30 for an OLED display 20 have been unknown.

[0068] The present inventors have studied combinations of an antiglare substrate 40 and a light-scattering layer 50 in order to suppress image glare, image discoloration, and a decrease in image clarity in an antiglare cover 30 for an OLED display 20. As a result, by using the first glare index value S1 (%) described above, the first discoloration index value M1 ( / sr) described below, and the first clarity index value C1 (%) described below as characteristic values ​​of the antiglare substrate 40, and by using the haze value H (%) as a characteristic value of the light-scattering layer 50, an appropriate combination was found, as described below.

[0069] FIG. 6 shows an example of a combination of an antiglare substrate 40 and a light-scattering layer 50 and their characteristic values. The following antiglare substrates 40A to 40N were prepared as the antiglare substrate 40. 40A: A commercially available product manufactured by AGC Glass Europe (product name: VRD 130). 40B: A commercially available product manufactured by AGC Glass Europe (product name: VRD 140). 40C: A commercially available product manufactured by AGC Glass Europe (product name: LST 70). 40D: A commercially available product manufactured by AGC Glass Europe (product name: LST 120). 40E to 40F: Aluminosilicate glass subjected to wet blasting and wet etching in this order. For the wet blasting, a slurry containing alumina particles (particle size: #2000), a dispersing agent, and a dispersion medium (water) was used. For the wet etching, an aqueous solution containing hydrogen fluoride (HF) was used as the etching solution. Samples 40E to 40F were produced under the same conditions, except for the time the glass was immersed in the etching solution. Samples 40G to 40N were produced by performing wet blasting and wet etching on aluminosilicate glass in that order. For the wet blasting, a slurry containing alumina particles (particle size: #4000), a dispersion aid, and a dispersion medium (water) was used. For the wet etching, an aqueous solution containing hydrogen fluoride (HF) and hydrogen chloride (HCl) was used as the etching solution. Samples 40G to 40N were produced under the same conditions, except for the time the glass was immersed in the etching solution.

[0070] The following light scattering layers 50A to 50D were prepared as the light scattering layer 50. All were standard types of optical adhesive "DA series" manufactured by Tomoegawa Seisakusho, but with different haze values. All had a thickness of 25 μm. 50A: Haze value 25% 50B: Haze value 40% 50C: Haze value 60% 50D: Haze value 80%

[0071] Furthermore, a model TOP156UHD06OLED-0 manufactured by Shenzhen Top Electronic Parts Co., Limited was prepared as the OLED display 20. The pixel pitch was 89.64 μm and the pixel density was 283 ppi.

[0072] The first glare index value S1 is measured as described above.

[0073] The first discoloration index value M1 represents the degree of discoloration of the image of the OLED display unit 10 when the anti-glare cover 30 has only the anti-glare substrate 40 without the light-scattering layer 50. The smaller the first discoloration index value M1, the less discoloration the image has, making it easier for the viewer to observe the image. The method for measuring the first discoloration index value M1 is as follows. Note that the OLED display 20 and the light-scattering layer 50 are not used in measuring the first discoloration index value M1. First, the anti-glare substrate 40 is placed on the image display surface 21 of the OLED display 20 without the light-scattering layer 50, with its uneven surface 41a facing upward. At this time, the gap between the OLED display 20 and the anti-glare substrate 40 is filled with water. Using a Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is incident on the uneven surface 41a at an incident angle of 40°, and the bidirectional reflectance distribution function (BRDF) is measured in the direction of a reflection angle of 20° on the incident surface (a plane including the normal at the point of incidence and the incident light). The measured value of the BRDF is the first light-brown index value M1. Here, the measurement is performed in reflectance measurement mode. The unit of M1 is (1 / sr).

[0074] The first clarity index value C1 represents the clarity of the image of the OLED display unit 10 when the anti-glare cover 30 has only the anti-glare substrate 40 without the light-scattering layer 50. The larger the first clarity index value C1, the higher the clarity of the image, making it easier for the viewer to observe the image. The first clarity index value C1 is measured as follows: The anti-glare substrate 40 is placed on the image display surface 21 of the OLED display 20 without the light-scattering layer 50, with its textured surface 41a facing upward. While the OLED display 20 displays a stripe pattern consisting of alternating white and black lines, the stripe pattern is captured through the anti-glare substrate 40 using the camera of a D&MS SMS-1000 measuring device. Each white line is formed by lighting two adjacent pixels 22 in the width direction of the white line. Each black line is formed by turning off two adjacent pixels 22 in the width direction of the black line. The intensity distribution of the captured image is measured, and the peak value Sp1 and valley value Sv1 of the intensity distribution are substituted into the following formula (4) to obtain the first sharpness index value C1. C1 is expressed as a percentage. Formula (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) x 100 Here, the measurement is performed in DOI (Distinctness of Image) measurement mode. The camera lens used is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate 40 is set so that the absolute value of the optical magnification m is 0.0962, and the focus of the lens is adjusted to the pixel 22 of the OLED display 20.

[0075] The second glare index value S2 represents the degree of glare of the image of the OLED display unit 10 when the anti-glare cover 30 has the anti-glare substrate 40 and the light-scattering layer 50. The smaller the second glare index value S2, the less glare there is in the image, making it easier for the viewer to observe the image. The method for measuring the second glare index value S2 is as follows. The anti-glare cover 30, which is composed of the anti-glare substrate 40 and the light-scattering layer 50, is placed on the image display surface 21 of the OLED display 20 with the uneven surface 41a facing upward. With only the green sub-pixel 22G of the pixels 22 emitting light, the image display surface 21 of the OLED display 20 is imaged through the anti-glare cover 30 using the camera of a measuring device SMS-1000 manufactured by D&MS. The position of the anti-glare substrate 40 is shifted by 1.0 mm, and the image display surface 21 of the OLED display 20 is again imaged through the anti-glare cover 30. Then, using the Difference Image Method (DIM) of the measuring device, 0 is input as the pixel ratio value, and the sparkle value obtained by image analysis is the second glare index value S2. S2 is expressed as a percentage. The distance between the light shielding plate attached to the camera and the anti-glare cover 30 is set so that the absolute value of the optical magnification m is 0.0962, and the lens is focused on the pixel 22 of the OLED display 20. In this case, the distance between the light shielding plate attached to the camera and the anti-glare cover 30 is approximately 600 mm. The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. Furthermore, in order to accurately match the aperture to 16, the light intensity value (Intensity) and exposure time (Exposure Time) at the fully open aperture of 2.8 are recorded, and the exposure time is set to 32 times the exposure time at aperture 2.8 so that the aperture area becomes 1 / 32 of that at aperture 2.8, and the lens aperture is adjusted so that the light intensity value becomes the same as the light intensity value at aperture 2.8.

[0076] The second discoloration index value M2 represents the degree of discoloration of the image of the OLED display unit 10 when the anti-glare cover 30 has an anti-glare substrate 40 and a light-scattering layer 50. The smaller the second discoloration index value M2, the less discoloration of the image, making it easier for the viewer to observe the image. The method for measuring the second discoloration index value M2 is as follows. First, the anti-glare cover 30, which is composed of the anti-glare substrate 40 and the light-scattering layer 50, is placed on the image display surface 21 of the OLED display 20 with its uneven surface 41a facing upward. At this time, the gap between the OLED display 20 and the anti-glare cover 30 is filled with water. If the light-scattering layer 50 also serves as an adhesive layer, it may be directly bonded. Using a Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is incident on the uneven surface 41a at an incident angle of 40°, and the bidirectional reflectance distribution function (BRDF) is measured in the direction of a reflection angle of 20° on the incident surface (a plane including the normal at the point of incidence and the incident light). The measured value of the BRDF is the second light-brown index value M2. Here, the measurement is performed in reflectance measurement mode. The unit of M2 is (1 / sr).

[0077] The second clarity index value C2 represents the clarity of the image of the OLED display unit 10 when the anti-glare cover 30 has an anti-glare substrate 40 and a light-scattering layer 50. The larger the second clarity index value C2, the higher the clarity of the image, making it easier for the viewer to observe the image. The method for measuring the second clarity index value C2 is as follows. An anti-glare cover 30 consisting of an anti-glare substrate 40 and a light-scattering layer 50 is placed on the image display surface 21 of the OLED display 20, with the textured surface 41a of the anti-glare substrate 40 facing upward. With the OLED display 20 displaying a stripe pattern consisting of alternating white and black lines, the stripe pattern is captured through the anti-glare substrate 40 using the camera of a D&MS SMS-1000 measuring device. Each white line is formed by lighting two adjacent pixels 22 in the width direction of the white line. Each black line is formed by turning off two adjacent pixels 22 in the width direction of the black line. The intensity distribution of the captured image is measured, and the peak value Sp2 and valley value Sv2 of the intensity distribution are substituted into the following formula (5) to obtain the second sharpness index value C2. C2 is expressed as a percentage. Formula (5): C2 = (Sp2 - Sv2) / (Sp2 + Sv2) × 100 Here, the measurement is performed in DOI (Distinctness of Image) measurement mode. The camera lens used is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shield attached to the camera and the anti-glare cover 30 is set so that the absolute value of the optical magnification m is 0.0962, and the focus of the lens is adjusted to the pixel 22 of the OLED display 20.

[0078] FIG. 7 shows the relationship between S1 and S2 shown in FIG. 6 for each H. From FIG. 7, it can be seen that if H is constant, the relationship between S1 and S2 can be approximated by a linear equation. If the intercept ds of the linear equation is set to 1.8, it can be well approximated for any H. It can be seen that the slope of the linear equation becomes smaller as H increases.

[0079] FIG. 8 shows the relationship between the slope of the linear equation shown in FIG. 7 and H. From FIG. 8, it can be seen that the slope of the linear equation shown in FIG. 7 is a quadratic equation of H (a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) can be approximated by the least squares method. Ｓis 6.28 x 10 －５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ is.

[0080] 7 and 8, it can be seen that the predicted value S3 of S2 can be calculated by substituting S1 and H into the following equation (6): Equation (6): S3 = S1 × (a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ The calculation results of S3 are shown in Fig. 13. Comparing Fig. 13 with Fig. 6, it can be seen that the predicted value S3 and the actually measured value S2 are almost the same.

[0081] FIG. 9 shows the relationship between M1 and M2 shown in FIG. 6 for each H. From FIG. 9, it can be seen that if H is constant, the relationship between M1 and M2 can be approximated by a linear equation. The slope d of the linear equation Ｍ If we set is 1, it can be well approximated for any H. We can see that the intercept of the linear equation becomes larger as H becomes larger.

[0082] FIG. 10 shows the relationship between the intercept of the linear equation shown in FIG. 9 and H. From FIG. 10, it can be seen that the intercept of the linear equation shown in FIG. 9 is a quadratic equation of H (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ ) can be approximated by the least squares method. Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ is.

[0083] 9 and 10, it can be seen that the predicted value M3 of M2 can be calculated by substituting M1 and H into the following equation (7): Equation (7): M3 = M1 × d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c ＭThe calculation results for M3 are shown in Figure 13. Comparing Figure 13 with Figure 6, it can be seen that the predicted value M3 and the measured value M2 are almost identical.

[0084] FIG. 11 shows the relationship between C1 and C2 shown in FIG. 6 for each H. From FIG. 11, it can be seen that if H is constant, the relationship between C1 and C2 can be approximated by a linear equation. The intercept d of the linear equation Ｃ If we set H to 3.6, it can be well approximated for any H. We can see that the slope of the linear equation becomes smaller as H becomes larger.

[0085] FIG. 12 shows the relationship between the slope of the linear equation shown in FIG. 11 and H. From FIG. 12, it can be seen that the slope of the linear equation shown in FIG. 11 is a quadratic equation of H (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) can be approximated by the least squares method. Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ is.

[0086] 11 and 12, it can be seen that the predicted value C3 of C2 can be calculated by substituting C1 and H into the following equation (8): Equation (8): C3 = C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ The calculation results of C3 are shown in Fig. 13. Comparing Fig. 13 with Fig. 6, it can be seen that the predicted value C3 and the actually measured value C2 are almost the same.

[0087] The inventors of the present application have been able to find an appropriate combination of the antiglare substrate 40 and the light-scattering layer 50 by using the first glare index value S1 (%), the first whitish-brown index value M1 ( / sr), and the first clarity index value C1 (%) as characteristic values ​​of the antiglare substrate 40, and by using the haze value H (%) as a characteristic value of the light-scattering layer 50.

[0088] It is preferable to select a combination of the antiglare substrate 40 and the light scattering layer 50 that satisfies the following formulas (1) to (3): Formula (1): S1×(aＳ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 Formula (2): M1×d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 Formula (3): C1×(a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 In FIG. 13, the range enclosed by the thick line L1 is the combination that satisfies the formulas (1) to (3).

[0089] 6, by selecting a combination that satisfies formulas (1) to (3), the second glare index value S2 (%) can be set to less than 6.79, the second discoloration index value M2 ( / sr) to 0.0670 or less, and the second clarity index value C2 to 35.00 or more. Therefore, in the anti-glare cover 30 for the OLED display 20, glare of the image, discoloration of the image, and a decrease in clarity of the image can be suppressed.

[0090] It is more preferable to select a combination of the antiglare substrate 40 and the light scattering layer 50 that satisfies the following formulas (1A) to (3A): Formula (1A): S1×(a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.00 Formula (2A): M1×d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3<0.0500 Formula (3A): C1×(a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧40.00 In FIG. 13, the range enclosed by the thick line L2 is the combination that satisfies the formulas (1A) to (3A).

[0091] 6, by selecting a combination that satisfies formulas (1A) to (3A), the second glare index value S2 (%) can be set to less than 6.00, the second discoloration index value M2 ( / sr) to less than 0.0500, and the second clarity index value C2 to 40.00 or greater. Therefore, in the anti-glare cover 30 for the OLED display 20, glare in the image, discoloration in the image, and a decrease in clarity of the image can be further suppressed.

[0092] The following notes are provided regarding the above embodiment.

[0093] [Supplementary Note 1] A method for manufacturing an anti-glare cover to be provided on an image display surface of an OLED (Organic Light Emitting Diode) display, wherein the anti-glare cover comprises an anti-glare substrate having an uneven surface on a surface opposite to the image display surface of the OLED display, and a light scattering layer disposed between the anti-glare substrate and the OLED display, wherein the OLED display has a plurality of pixels, each of which has a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light, and wherein the average value A0 of the total area of ​​each pixel and the average value A1 of the total light-emitting area of ​​all the green sub-pixels included in each pixel are expressed as Ｇ The difference ΔA Ｇ (ΔA Ｇ = A0 - A1 Ｇ ) ratio (ΔA Ｇ / A0) is 85% to 95%, the pixel density is 170 ppi to 650 ppi, and the manufacturing method satisfies the following formulas (1), (2), and (3): Formula (1): S1×(a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 (in formula (1), a Ｓ is 6.28 x 10 －５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ and d Ｓ is 1.8.) Equation (2): M1 × d Ｍ+ (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 (In formula (2), a Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ and d Ｍ is 1.) Equation (3): C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 (in formula (3), a Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ and d Ｃ is 3.6.) A method for manufacturing an antiglare cover, comprising: selecting a combination of the antiglare substrate and the light-scattering layer; and forming the antiglare substrate and the light-scattering layer in the selected combination.

[0094] First glare index value S1: The anti-glare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the uneven surface facing upward. With only the green sub-pixels of the pixels emitting light, the image display surface of the OLED display is imaged through the anti-glare substrate using a camera on a D&MS SMS-1000 measuring device. The Sparkle value obtained by image analysis with the measuring device is the first glare index value S1. S1 is expressed as a percentage. The distance between the light-shielding plate attached to the camera and the anti-glare substrate is approximately 600 mm. The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16.

[0095] First discoloration index value M1: The antiglare substrate is placed horizontally on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. Using a Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is incident on the textured surface at an incident angle of 40°, and the bidirectional reflectance distribution function (BRDF) is measured at the incident plane (a plane containing the normal at the incident point and the incident light) at a reflection angle of 20°. The measured value of the BRDF is the first discoloration index value M1. The unit of M1 is (1 / sr).

[0096] First clarity index value C1: The antiglare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. With the OLED display displaying a stripe pattern consisting of alternating white and black lines, the stripe pattern is imaged through the antiglare substrate using a camera on a D&MS SMS-1000 measuring device. Each white line is formed by turning on two adjacent pixels in the width direction of the white line. Each black line is formed by turning off two adjacent pixels in the width direction of the black line. The intensity distribution of the image is measured, and the first clarity index value C1 is obtained by substituting the peak value Sp1 and valley value Sv1 of the intensity distribution into the following formula (4). C1 is expressed as a percentage. Equation (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) × 100 The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962. The focus of the lens is adjusted to the pixel of the OLED display.

[0097] Haze value H: The percentage of transmitted light that deviates from the incident light by 2.5° or more due to forward scattering among the transmitted light that passes through the light scattering layer in the thickness direction is the haze value H.

[0098] [Appendix 2] The method for manufacturing an antiglare cover according to Appendix 1, which satisfies the following formulas (1A), (2A), and (3A): Formula (1A): S3<6.00 Formula (2A): M3<0.0500 Formula (3A): C3≧40.00, comprises selecting a combination of the antiglare substrate and the light-scattering layer, and forming the antiglare substrate and the light-scattering layer with the selected combination.

[0099] [Appendix 3] The method for manufacturing an antiglare cover according to Appendix 1 or 2, wherein the antiglare substrate is a glass substrate and the uneven surface is formed of glass.

[0100] [Appendix 4] The method for manufacturing an antiglare cover according to any one of Appendices 1 to 3, wherein the light scattering layer has a resin layer and a plurality of particles dispersed inside the resin layer.

[0101] [Supplementary Note 5] A method for manufacturing an OLED display unit comprising an OLED (Organic Light Emitting Diode) display and an anti-glare cover provided on an image display surface of the OLED display, wherein the anti-glare cover comprises an anti-glare substrate having an uneven surface on a surface opposite to the image display surface of the OLED display, and a light scattering layer disposed between the anti-glare substrate and the OLED display, wherein the OLED display has a plurality of pixels, each of which has a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light, and wherein the average value A0 of the total area of ​​each pixel and the average value A1 of the total light-emitting areas of all the green sub-pixels included in each pixel are expressed as a function of the average value A0 of the total light-emitting areas of the green sub-pixels included in each pixel. Ｇ The difference ΔA Ｇ (ΔA Ｇ = A0 - A1 Ｇ ) ratio (ΔA Ｇ / A0) is 85% to 95%, the pixel density is 170 ppi to 650 ppi, and the manufacturing method satisfies the following formulas (1), (2), and (3): Formula (1): S1×(a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 (in formula (1), a Ｓ is 6.28 x 10－５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ and d Ｓ is 1.8.) Equation (2): M1 × d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 (In formula (2), a Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ and d Ｍ is 1.) Equation (3): C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 (in formula (3), a Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ and d Ｃ is 3.6.) A method for manufacturing an antiglare cover, comprising: selecting a combination of the antiglare substrate and the light-scattering layer; and forming the antiglare substrate and the light-scattering layer in the selected combination.

[0102] First glare index value S1: The anti-glare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the uneven surface facing upward. With only the green sub-pixels of the pixels emitting light, the image display surface of the OLED display is imaged through the anti-glare substrate using a camera on a D&MS SMS-1000 measuring device. The Sparkle value obtained by image analysis with the measuring device is the first glare index value S1. S1 is expressed as a percentage. The distance between the light-shielding plate attached to the camera and the anti-glare substrate is approximately 600 mm. The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16.

[0103] First discoloration index value M1: The antiglare substrate is placed horizontally on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. Using a Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is incident on the textured surface at an incident angle of 40°, and the bidirectional reflectance distribution function (BRDF) is measured at the incident plane (a plane containing the normal at the incident point and the incident light) at a reflection angle of 20°. The measured value of the BRDF is the first discoloration index value M1. The unit of M1 is (1 / sr).

[0104] First clarity index value C1: The antiglare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. With the OLED display displaying a stripe pattern consisting of alternating white and black lines, the stripe pattern is imaged through the antiglare substrate using a camera on a D&MS SMS-1000 measuring device. Each white line is formed by turning on two adjacent pixels in the width direction of the white line. Each black line is formed by turning off two adjacent pixels in the width direction of the black line. The intensity distribution of the image is measured, and the first clarity index value C1 is obtained by substituting the peak value Sp1 and valley value Sv1 of the intensity distribution into the following formula (4). C1 is expressed as a percentage. Equation (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) × 100 The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962. The focus of the lens is adjusted to the pixel of the OLED display.

[0105] Haze value H: The percentage of transmitted light that deviates from the incident light by 2.5° or more due to forward scattering among the transmitted light that passes through the light scattering layer in the thickness direction is the haze value H.

[0106] [Supplementary Note 6] An anti-glare cover provided on an image display surface of an OLED (Organic Light Emitting Diode) display, the anti-glare cover comprising: an anti-glare substrate having an uneven surface on a surface opposite to the image display surface of the OLED display; and a light scattering layer disposed between the anti-glare substrate and the OLED display; the OLED display having a plurality of pixels, each of which has a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light; and a ratio of the average value A0 of the total area of ​​each pixel to the average value A1 of the total light-emitting area of ​​all the green sub-pixels included in each pixel. Ｇ The difference ΔA Ｇ (ΔA Ｇ = A0 - A1 Ｇ ) ratio (ΔA Ｇ / A0) is 85% to 95%, the pixel density is 170 ppi to 650 ppi, and the antiglare substrate and the light-scattering layer satisfy the following formulas (1), (2), and (3): Formula (1): S1×(a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 (in formula (1), a Ｓ is 6.28 x 10 －５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ and d Ｓ is 1.8.) Equation (2): M1 × d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 (In formula (2), a Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ and d Ｍ is 1.) Equation (3): C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 (in formula (3), a Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ and d Ｃ is 3.6.) Anti-glare cover.

[0107] First glare index value S1: The anti-glare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the uneven surface facing upward. With only the green sub-pixels of the pixels emitting light, the image display surface of the OLED display is imaged through the anti-glare substrate using a camera on a D&MS SMS-1000 measuring device. The Sparkle value obtained by image analysis with the measuring device is the first glare index value S1. S1 is expressed as a percentage. The distance between the light-shielding plate attached to the camera and the anti-glare substrate is approximately 600 mm. The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16.

[0108] First discoloration index value M1: The antiglare substrate is placed horizontally on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. Using a Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is incident on the textured surface at an incident angle of 40°, and the bidirectional reflectance distribution function (BRDF) is measured at the incident plane (a plane containing the normal at the incident point and the incident light) at a reflection angle of 20°. The measured value of the BRDF is the first discoloration index value M1. The unit of M1 is (1 / sr).

[0109] First clarity index value C1: The antiglare substrate is placed on the image display surface of the OLED display without the light-scattering layer, with the textured surface facing upward. With the OLED display displaying a stripe pattern consisting of alternating white and black lines, the stripe pattern is imaged through the antiglare substrate using a camera on a D&MS SMS-1000 measuring device. Each white line is formed by turning on two adjacent pixels in the width direction of the white line. Each black line is formed by turning off two adjacent pixels in the width direction of the black line. The intensity distribution of the image is measured, and the first clarity index value C1 is obtained by substituting the peak value Sp1 and valley value Sv1 of the intensity distribution into the following formula (4). C1 is expressed as a percentage. Equation (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) × 100 The camera lens is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962. The focus of the lens is adjusted to the pixel of the OLED display.

[0110] Haze value H: The percentage of transmitted light that deviates from the incident light by 2.5° or more due to forward scattering among the transmitted light that passes through the light scattering layer in the thickness direction is the haze value H.

[0111] [Supplementary Note 7] An OLED display unit comprising the anti-glare cover according to Supplementary Note 6 and the OLED display.

[0112] The method for manufacturing an anti-glare cover, the method for manufacturing an OLED display unit, the anti-glare cover, and the OLED display unit according to the present disclosure have been described above, but the present disclosure is not limited to the above embodiments. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These naturally fall within the technical scope of the present disclosure.

[0113] This application claims priority based on Japanese Patent Application No. 2023-122410 filed with the Japan Patent Office on July 27, 2023, the entire contents of which are incorporated herein by reference.

[0114] 10 OLED display unit 20 OLED display 30 Antiglare cover 40 Antiglare substrate 50 Light scattering layer

Claims

1. A method for manufacturing an anti-glare cover to be provided on an image display surface of an OLED (Organic Light Emitting Diode) display, the anti-glare cover comprising an anti-glare substrate having an uneven surface on a surface opposite to the image display surface of the OLED display, and a light scattering layer disposed between the anti-glare substrate and the OLED display, the OLED display having a plurality of pixels, each of the pixels having a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light, the average value A0 of the total area of ​​each pixel being compared with the average value A0 of the total light emitting area of ​​all the green sub-pixels included in each pixel, Ｇ Difference ΔA Ｇ (ΔA Ｇ = A0 - A1 Ｇ ) ratio (ΔA Ｇ / A0) is 85% to 95%, the pixel density is 170 ppi to 650 ppi, and the manufacturing method satisfies the following formulas (1), (2), and (3), Formula (1): S1 × (a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 (in formula (1), a Ｓ is 6.28 x 10 －５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ and d Ｓ is 1.8.) Equation (2): M1 × d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 (In formula (2), a Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ and d Ｍ is 1.) Equation (3): C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 (in formula (3), a Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ and d Ｃ is 3.6.) A method for manufacturing an anti-glare cover, comprising: selecting a combination of the anti-glare substrate and the light scattering layer; and forming the anti-glare substrate and the light scattering layer with the selected combination. First glare index value S1: The anti-glare substrate is placed on the image display surface of the OLED display without the light scattering layer, with the uneven surface facing upward. With only the green subpixel of the pixels emitting light, the image display surface of the OLED display is imaged through the anti-glare substrate by a camera of a measuring device SMS-1000 manufactured by D&MS. The sparkle value obtained by image analysis of the measuring device is the first glare index value S1. S1 is expressed as a percentage. The distance between the light shielding plate attached to the camera and the anti-glare substrate is about 600 mm. The lens of the camera is a 23FM50SP lens with a focal length of 50 mm, and is used with an aperture of 16. First light-brown index value M1: The anti-glare substrate is horizontally installed on the image display surface of the OLED display, without the light scattering layer, with the uneven surface facing upward. Using Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is made to enter the uneven surface at an incident angle of 40°, and a bidirectional reflectance distribution function (BRDF) is measured in the direction of a reflection angle of 20° on the incident surface (a plane including the normal at the incident point and the incident light). The measured value of the BRDF is the first light-brown index value M1. The unit of M1 is (1 / sr).First clarity index value C1: The antiglare substrate is placed on the image display surface of the OLED display without the light scattering layer, with the uneven surface facing upward. While the OLED display displays a stripe pattern having alternating white and black lines, the stripe pattern is imaged through the anti-glare substrate by a camera of a measuring device SMS-1000 manufactured by D&MS. Each of the white lines is formed by lighting two pixels that are adjacent to each other in the width direction of the white line. Each of the black lines is formed by turning off two adjacent pixels in the width direction of the black line. The intensity distribution of the captured image is measured, and the peak value Sp1 and valley value Sv1 of the intensity distribution are substituted into the following formula (4) to obtain a value that is the first sharpness index value C1. C1 is expressed as a percentage. Formula (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) x 100 The lens of the camera is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962. The focus of the lens is adjusted to the pixel of the OLED display. Haze value H: The percentage of the transmitted light that is deviated from the incident light by 2.5° or more due to forward scattering among the transmitted light that is transmitted through the light scattering layer in the thickness direction is the haze value H.

2. The method for manufacturing an anti-glare cover described in claim 1, which satisfies the following formulas (1A), (2A), and (3A): Formula (1A): S3 < 6.00 Formula (2A): M3 < 0.0500 Formula (3A): C3 ≧ 40.00, comprises selecting a combination of the anti-glare substrate and the light-scattering layer, and forming the anti-glare substrate and the light-scattering layer with the selected combination.

3. The method for manufacturing an anti-glare cover according to claim 1 or 2, wherein the anti-glare substrate is a glass substrate, and the uneven surface is formed of glass.

4. A method for manufacturing an anti-glare cover as described in claim 1 or 2, wherein the light scattering layer has a resin layer and a plurality of particles dispersed within the resin layer.

5. A method for manufacturing an OLED display unit comprising an OLED (Organic Light Emitting Diode) display and an anti-glare cover provided on an image display surface of the OLED display, wherein the anti-glare cover comprises an anti-glare substrate having an uneven surface on a surface opposite to the image display surface of the OLED display, and a light scattering layer disposed between the anti-glare substrate and the OLED display, wherein the OLED display has a plurality of pixels, each of which has a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light, and wherein the average value A0 of the total area of ​​each pixel and the average value A1 of the total light-emitting area of ​​all the green sub-pixels included in each pixel are calculated based on the average value A0 of the total light-emitting area of ​​each pixel. Ｇ Difference ΔA Ｇ (ΔA Ｇ = A0 - A1 Ｇ ) ratio (ΔA Ｇ / A0) is 85% to 95%, the pixel density is 170 ppi to 650 ppi, and the manufacturing method satisfies the following formulas (1), (2), and (3), Formula (1): S1 × (a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 (in formula (1), a Ｓ is 6.28 x 10 －５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ and d Ｓ is 1.8.) Equation (2): M1 × d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 (In formula (2), a Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ and d Ｍ is 1.) Equation (3): C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 (in formula (3), a Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ and d Ｃ is 3.6.) A method for manufacturing an anti-glare cover, comprising: selecting a combination of the anti-glare substrate and the light scattering layer; and forming the anti-glare substrate and the light scattering layer with the selected combination. First glare index value S1: The anti-glare substrate is placed on the image display surface of the OLED display without the light scattering layer, with the uneven surface facing upward. With only the green subpixel of the pixels emitting light, the image display surface of the OLED display is imaged through the anti-glare substrate by a camera of a measuring device SMS-1000 manufactured by D&MS. The sparkle value obtained by image analysis of the measuring device is the first glare index value S1. S1 is expressed as a percentage. The distance between the light shielding plate attached to the camera and the anti-glare substrate is about 600 mm. The lens of the camera is a 23FM50SP lens with a focal length of 50 mm, and is used with an aperture of 16. First light-brown index value M1: The anti-glare substrate is horizontally installed on the image display surface of the OLED display, without the light scattering layer, with the uneven surface facing upward. Using Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is made to enter the uneven surface at an incident angle of 40°, and a bidirectional reflectance distribution function (BRDF) is measured in the direction of a reflection angle of 20° on the incident surface (a plane including the normal at the incident point and the incident light). The measured value of the BRDF is the first light-brown index value M1. The unit of M1 is (1 / sr).First clarity index value C1: The antiglare substrate is placed on the image display surface of the OLED display without the light scattering layer, with the uneven surface facing upward. While the OLED display displays a stripe pattern having alternating white and black lines, the stripe pattern is imaged through the anti-glare substrate by a camera of a measuring device SMS-1000 manufactured by D&MS. Each of the white lines is formed by lighting two pixels that are adjacent to each other in the width direction of the white line. Each of the black lines is formed by turning off two adjacent pixels in the width direction of the black line. The intensity distribution of the captured image is measured, and the peak value Sp1 and valley value Sv1 of the intensity distribution are substituted into the following formula (4) to obtain a value that is the first sharpness index value C1. C1 is expressed as a percentage. Formula (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) x 100 The lens of the camera is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962. The focus of the lens is adjusted to the pixel of the OLED display. Haze value H: The percentage of the transmitted light that is deviated from the incident light by 2.5° or more due to forward scattering among the transmitted light that is transmitted through the light scattering layer in the thickness direction is the haze value H.

6. An anti-glare cover provided on an image display surface of an OLED (Organic Light Emitting Diode) display, the anti-glare cover comprising an anti-glare substrate having an uneven surface on a surface opposite to the image display surface of the OLED display, and a light scattering layer disposed between the anti-glare substrate and the OLED display, the OLED display having a plurality of pixels, each of the pixels having a red sub-pixel that emits red light, a green sub-pixel that emits green light, and a blue sub-pixel that emits blue light, the average value A0 of the total area of ​​each pixel being compared with the average value A0 of the total light emitting area of ​​all the green sub-pixels included in each pixel, Ｇ Difference ΔA Ｇ (ΔA Ｇ = A0 - A1 Ｇ ) ratio (ΔA Ｇ / A0) is 85% to 95%, the pixel density is 170 ppi to 650 ppi, and the antiglare substrate and the light scattering layer satisfy the following formulas (1), (2), and (3): Formula (1): S1 × (a Ｓ ×H ２ +b Ｓ ×H+c Ｓ ) + d Ｓ =S3<6.79 (in formula (1), a Ｓ is 6.28 x 10 －５ and b Ｓ is -1.61 x 10 －２ and c Ｓ is 9.13 x 10 －１ and d Ｓ is 1.8.) Equation (2): M1 × d Ｍ + (a Ｍ ×H ２ +b Ｍ ×H+c Ｍ )=M3≦0.0670 (In formula (2), a Ｍ is 9.45 x 10 －７ and b Ｍ is 1.24 x 10 －４ and c Ｍ is -5.49 x 10 －５ and d Ｍ is 1.) Equation (3): C1 × (a Ｃ ×H ２ +b Ｃ ×H+c Ｃ ) + d Ｃ =C3≧35.00 (in formula (3), a Ｃ is -7.05 x 10 －５ and b Ｃ is 6.30 x 10 －５ and c Ｃ is 8.88 x 10 －１ and d Ｃ is 3.6.) Anti-glare cover. First glare index value S1: The anti-glare substrate is placed on the image display surface of the OLED display without the light scattering layer, with the uneven surface facing upward. With only the green subpixel of the pixels emitting light, the image display surface of the OLED display is imaged through the anti-glare substrate by the camera of a measuring device SMS-1000 manufactured by D&MS. The sparkle value obtained by image analysis of the measuring device is the first glare index value S1. S1 is expressed as a percentage. The distance between the light shielding plate attached to the camera and the anti-glare substrate is about 600 mm. The lens of the camera is a 23FM50SP lens with a focal length of 50 mm, and is used with an aperture of 16. First light-brown index value M1: The anti-glare substrate is horizontally installed on the image display surface of the OLED display, without the light scattering layer, with the uneven surface facing upward. Using Mini-Diff V2 manufactured by Synopsys, green light with a wavelength of 525 nm is made to enter the uneven surface at an incident angle of 40°, and a bidirectional reflectance distribution function (BRDF) is measured in the direction of a reflection angle of 20° on the incident surface (a plane including the normal at the incident point and the incident light). The measured value of the BRDF is the first light-brown index value M1. The unit of M1 is (1 / sr).First clarity index value C1: The antiglare substrate is placed on the image display surface of the OLED display without the light scattering layer, with the uneven surface facing upward. While the OLED display displays a stripe pattern having alternating white and black lines, the stripe pattern is imaged through the anti-glare substrate by a camera of a measuring device SMS-1000 manufactured by D&MS. Each of the white lines is formed by lighting two pixels that are adjacent to each other in the width direction of the white line. Each of the black lines is formed by turning off two adjacent pixels in the width direction of the black line. The intensity distribution of the captured image is measured, and the peak value Sp1 and valley value Sv1 of the intensity distribution are substituted into the following formula (4) to obtain a value that is the first sharpness index value C1. C1 is expressed as a percentage. Formula (4): C1 = (Sp1 - Sv1) / (Sp1 + Sv1) x 100 The lens of the camera is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16. The distance between the light shielding plate attached to the camera and the anti-glare substrate is set so that the absolute value of the optical magnification m is 0.0962. The focus of the lens is adjusted to the pixel of the OLED display. Haze value H: The percentage of the transmitted light that is deviated from the incident light by 2.5° or more due to forward scattering among the transmitted light that is transmitted through the light scattering layer in the thickness direction is the haze value H.

7. An OLED display unit comprising the anti-glare cover of claim 6 and the OLED display.

Images