Liquid crystal display device and display device

Abstract

To provide a liquid crystal display device and a display apparatus which can further improve the visual field angle characteristics of not only a front direction but also directions other than the front direction.SOLUTION: A liquid crystal display device comprises: a light source; a light-focusing part; a liquid crystal part 14; and an anisotropic diffusion layer 16. The light source emits light. The light-focusing part condenses light emitted from the light source in the front direction of the own device such that the light condensing property in the direction becoming the left-right direction is different from the light condensing property in the direction becoming the up-down direction when an image is displayed. The liquid crystal part 14 controls the transmission state of the light condensed by the light-focusing part with the liquid crystal. The anisotropic diffusion layer 16 anisotropic-diffuses the light passing through the liquid crystal part 14.SELECTED DRAWING: Figure 1

Description

[Technical Field] 【0001】 This invention relates to liquid crystal display devices and display devices. More specifically, it relates to liquid crystal display devices used in display devices, etc. [Background technology] 【0002】 Development of backlight units is progressing to improve the brightness, contrast, and color reproduction of display devices using liquid crystal displays. Among these, backlight units incorporating a color conversion sheet containing phosphors or similar materials are attracting attention. This color conversion sheet utilizes both primary light from the light source and color-converted light (secondary light) produced by the color conversion sheet. This results in a backlight unit with high luminous efficiency and excellent color reproduction. In such backlight units, it is common to arrange two highly light-gathering prism sheets, such as a prism sheet. This improves the brightness and contrast when viewing a liquid crystal display (LCD) display from the front. The prism sheets concentrate light that diffuses horizontally and vertically towards the front, improving brightness and contrast when viewed from the front. However, the emitted light from directions other than the front is significantly reduced. As a result, a decrease in brightness occurs when viewing the display from an oblique angle. This can also be said to be a significant deterioration in the viewing angle characteristics when viewing the display from an oblique angle. This is particularly noticeable when using a VA (Vertical Alignment) type LCD panel. In recent years, to improve viewing angle characteristics, an anisotropic diffusion layer that diffuses light in a specific direction has been added to liquid crystal display devices. This specific direction is, for example, the left-right direction of the display device. The anisotropic diffusion layer utilizes the diffusion and diffraction phenomena of light to scatter light in the left-right direction of the display device. This improves brightness and contrast when the display device is viewed from an oblique angle. 【0003】 Patent Document 1 describes an edge-lit backlight. The edge-lit backlight comprises at least one light source, an optical plate, and an optical component. At least one light source emits primary light. The optical plate is positioned adjacent to the light source and guides the light. The optical component is positioned on the light-emitting surface side of the optical plate. The optical component has a quantum dot sheet and a prism sheet located on the light-emitting surface side of the quantum dot sheet. The light source is positioned adjacent to a surface substantially perpendicular to the light-emitting surface of the optical plate. The quantum dot sheet has a quantum dot-containing layer containing quantum dots and a binder resin that absorb primary light and emit secondary light. Furthermore, the following condition (1) is met during measurement. During measurement, visible light from a halogen lamp (12V, 48W) is shone perpendicularly onto one surface of the quantum dot sheet. The intensity of the transmitted light is then measured at 1-degree intervals in the range of -85 degrees to +85 degrees. <Condition (1)> Let P1 be the sum of the intensities between -5°C and +5°C. Let P2 be the sum of the intensities between -70°C and -85°C and between +70°C and +85°C. Furthermore, let P3 be the sum of the intensities between -15°C and -45°C and between +15°C and +45°C. In this case, (P1+P2) / P3 must be 0.65 or less. 【0004】 Patent Document 2 describes an optical structure. This optical structure comprises a low refractive index layer and a high refractive index layer. The interface between the low refractive index layer and the high refractive index layer has an uneven shape. The recesses of the uneven shape are recessed towards the low refractive index layer, and the convex parts are convex towards the high refractive index layer. Each of the recesses and convex parts has a flat portion that extends along the surface direction of the low refractive index layer and the high refractive index layer. On the sides of the uneven shape, two adjacent sides of a recess, flanking the flat portion, form a tapered shape toward the low refractive index layer. Similarly, two adjacent sides of a convex part, flanking the flat portion, form a tapered shape toward the high refractive index layer. The high refractive index layer is positioned to face the display surface side of the display device. 【0005】 Patent Document 3 describes an anisotropic light-diffusing adhesive laminate. The anisotropic light-diffusing adhesive laminate is an adhesive laminate having two or more adhesive layers containing an adhesive. At least one of the adhesive layers contains needle-shaped fillers with different refractive indices from the adhesive. Together with this, the needle-shaped fillers are dispersed oriented in substantially the same direction. The needle-shaped fillers include aluminum borate, calcium silicate, or basic magnesium sulfate. The needle-shaped fillers have a major axis of 2 to 5000 μm and a minor axis of 0.1 to 20 μm. [Prior art documents] [Patent Documents] 【0006】 [Patent Document 1] Patent No. 6586805 [Patent Document 2] Japanese Patent Publication No. 2020-16881 [Patent Document 3] Patent No. 4297696 [Overview of the project] [Problems that the invention aims to solve] 【0007】 However, to ensure sufficient viewing angle characteristics with only an anisotropic diffusion layer, it is necessary to use an anisotropic diffusion layer with high diffusion. In this case, although the viewing angle characteristics improve, the image quality characteristics in the front direction deteriorate. Image quality characteristics in the front direction include, for example, contrast. Furthermore, when the front direction is set to 0°, the brightness does not improve easily when observed in a region between 20° and 50°, for example. The present invention aims to provide a liquid crystal display device and a display device that can further improve viewing angle characteristics not only in the front direction but also in directions other than the front direction. [Means for solving the problem] 【0008】 The liquid crystal display device of the present invention includes a light source, a light condensing unit, a liquid crystal unit, and an anisotropic diffusion layer. The light source emits light. The light condensing unit condenses the light emitted from the light source in the front direction of the device itself. Further, when an image is displayed, the light condensing unit condenses the light such that the light condensing property in the horizontal direction is different from the light condensing property in the vertical direction. The liquid crystal unit controls the transmission state of the light condensed by the light condensing unit by means of liquid crystal. The anisotropic diffusion layer anisotropically diffuses the light transmitted through the liquid crystal unit. 【0009】 Here, the light condensing unit can be configured such that the light condensing property in the direction in which the viewing angle is desired to be further enlarged is lower among the horizontal direction and the vertical direction. At this time, the direction in which the viewing angle is desired to be further enlarged can be the horizontal direction. The direction in which the viewing angle is desired to be further enlarged is generally the horizontal direction when an image is displayed. Hereinafter, the direction in which the viewing angle is further enlarged is the horizontal direction. Further, the light condensing unit may be composed of two lens sheets in which a plurality of lenses are arranged in a planar shape. The two lens sheets include a first lens sheet and a second lens sheet having a higher light condensing property than the first lens sheet. Then, due to the difference in the light condensing properties between the first lens sheet and the second lens sheet, the light condensing property in the direction in which the viewing angle is desired to be further enlarged is made lower among the horizontal direction and the vertical direction. The first lens sheet and the second lens sheet may be selected from three types. These three types are a prism sheet, a lenticular sheet, and a microlens array sheet. And the direction in which the light condensing property is lower among the horizontal direction and the vertical direction may be the direction along the direction in which the anisotropic diffusion layer anisotropically diffuses light. 【0010】 It may further include at least one of a first adhesive layer and a second adhesive layer. The first adhesive layer is located on the light emitting side with respect to the first lens sheet. The second adhesive layer is located on the light emitting side with respect to the second lens sheet. When the first adhesive layer is provided, the light condensing property of the first lens sheet is controlled by the first adhesive layer. When the second adhesive layer is provided, the light condensing property of the second lens sheet is controlled by the second adhesive layer. Furthermore, the thickness of the first adhesive layer may be greater than the thickness of the second adhesive layer. In this case, the thickness of the first adhesive layer can be 1.5 times or more the thickness of the second adhesive layer. Furthermore, the first lens sheet and the second lens sheet may be of the same type. In this case, when a first adhesive layer is provided, the light-gathering properties of the first lens sheet are controlled by the thickness of the first adhesive layer. Also, when a second adhesive layer is provided, the light-gathering properties of the second lens sheet are controlled by the thickness of the second adhesive layer. In this case, both the first lens sheet and the second lens sheet can be prism sheets. In this case, the thickness of the first adhesive layer may be 10 μm or more, while the thickness of the second adhesive layer may be less than 10 μm. Furthermore, both the first and second lens sheets can be prism sheets. In this case, the apex angle of the first lens sheet can be less than 83° or greater than 97°. The apex angle of the second lens sheet can be between 83° and 97°. Furthermore, we consider the full width at half maximum (FWHM) of the luminance distribution, which is the relationship between the angle relative to the front direction and the luminance, and is an indicator of the light-gathering ability of the light-gathering element. The FWHM can be made to be 7° or more larger in the direction in which the viewing angle is to be widened, among the left-right and up-down directions. 【0011】 The anisotropic diffusion layer may include anisotropic particles and a resin portion. The anisotropic particles have an anisotropic shape and are arranged along one direction in their long axis. The resin portion consists of resin in which the anisotropic particles are dispersed. The anisotropic diffusion layer may be configured such that the reflectance, excluding the specular reflection component, is 1.0% or less. Anisotropic particles may have different refractive indices in the long axis direction and the short axis direction. Also, the refractive index of the resin part is n b Let n be the refractive index of the anisotropic particle in the direction of its long axis. ax Let n be the refractive index of the anisotropic particle in the direction of its short axis. ayLet it be so. At this time, at least one of the following relationships (I) and (II) holds. (I)|n b -n ax |<0.04 and 0.04 < |n b -n ay |<0.50 (II)|n b -n ay |<0.04 and 0.04 < |n b -n ax |<0.50 Furthermore, the anisotropic particles can be made such that the length in the long axis direction is 1 μm or more and 200 μm or less. Furthermore, the anisotropic particles can be made such that the length in the short axis direction is 0.1 μm or more and 10 μm or less. Moreover, the aspect ratio, which is the ratio of the length in the long axis direction to the length in the short axis direction of the anisotropic particles, can be made 10 or more. 【0012】 And the interface between the anisotropic particles and the resin part can be made compatible. Also, the refractive index of the resin part can be made 1.45 or more and 1.65 or less. Furthermore, the anisotropic particles can be made to contain at least one of metal oxides, carbonate compounds, hydroxide compounds, and phosphate compounds. Moreover, it may be further provided with a low refractive index layer having a refractive index of 1.40 or less. The difference in refractive index between the resin part and the low refractive index layer can be made 0.1 or more. And the anisotropic diffusion layer can be made such that the haze value is 20% or more and 80% or less. Also, the anisotropic diffusion layer can be made such that the anisotropic diffusion degree is 3 or more. And it can be further provided with a high refractive index layer having a refractive index of 1.60 or more. Also, it can be further provided with a hard coat layer having a refractive index of 1.54 or more. Furthermore, the system may further include a substrate supporting a low refractive index layer and an anisotropic diffusion layer having a refractive index of 1.40 or less. This substrate is provided between the low refractive index layer and the anisotropic diffusion layer. Furthermore, the structure may further include a low refractive index layer having a refractive index of 1.40 or less. The anisotropic diffusion layer can function as a substrate supporting the low refractive index layer. Furthermore, the anisotropic diffusion layer can be made to anisotropically diffuse light through the air contained in the vacancies formed in the anisotropic diffusion layer. Furthermore, the anisotropic diffusion layer can be made to diffuse light anisotropically by the uneven structure of the resin formed on the anisotropic diffusion layer. 【0013】 Furthermore, the display device of the present invention comprises the above-mentioned liquid crystal display device. [Effects of the Invention] 【0014】 According to the present invention, it is possible to provide a liquid crystal display device and a display device that can further improve viewing angle characteristics not only in the front direction but also in directions other than the front direction. [Brief explanation of the drawing] 【0015】 [Figure 1] (a) is a diagram illustrating a display device to which this embodiment is applied. (b) is a cross-sectional view of Ib-Ib in Figure 1(a), showing an example of the configuration of a liquid crystal display device to which this embodiment is applied. [Figure 2] This diagram shows the substrate, anisotropic diffusion layer, and low refractive index layer. [Figure 3] This is a diagram showing the structure of the backlight unit. [Figure 4] Figures (a) to (c) show the structure of the first and second lens sheets. [Figure 5] Figures (a) to (c) show the types of lens sheets used as the first and second lens sheets. [Figure 6]This figure shows the luminance distribution, which is the relationship between the angle relative to the front direction and the luminance. [Figure 7] Figures (a) to (e) illustrate various configurations of anisotropic diffusion layers. [Figure 8] Figures (a) to (c) illustrate the anisotropic diffusion layer. [Figure 9] Figures (a) to (e) show examples of the composition of the resin film. [Figure 10] (a) is a flowchart showing a method for creating a layered resin film as shown in Figure 2. (b) is a flowchart explaining the method for creating an anisotropic diffusion layer and a low refractive index layer. [Figure 11] This diagram illustrates the effect of providing an anisotropic diffusion layer. [Figure 12] This table shows the effects of adding an anisotropic diffusion layer or lens sheet. [Figure 13] This figure shows the luminance distribution, which is the relationship between the angle relative to the front direction and the luminance. [Modes for carrying out the invention] 【0016】 The embodiments for carrying out the present invention will be described in detail below. However, the present invention is not limited to the embodiments described below. Furthermore, it can be implemented with various modifications within the scope of its essence. In addition, the drawings used are for illustrative purposes only and do not represent the actual size. 【0017】 <Description of the display device> Figure 1(a) is a diagram illustrating the display device 1 to which this embodiment is applied. The illustrated display device 1 is, for example, a liquid crystal display for a PC (Personal Computer) or a liquid crystal television. Display device 1 displays an image on the liquid crystal display device 1a. 【0018】 <Description of the liquid crystal display device 1a> Figure 1(b) is a cross-sectional view of Figure 1(a) from Ib to Ib, showing an example of the configuration of the liquid crystal display device 1a to which this embodiment is applied. The liquid crystal display device 1a is an example of a display means for displaying an image. The liquid crystal display device 1a in this embodiment is, for example, a liquid crystal display device using a VA-type liquid crystal panel. The illustrated liquid crystal display device 1a has a backlight unit 11 and a polarizing film 12a. The liquid crystal display device 1a also has a phase difference film 13a, a liquid crystal section 14, a phase difference film 13b, and a polarizing film 12b. Furthermore, the liquid crystal display device 1a has a substrate 15, an anisotropic diffusion layer 16, and a low refractive index layer 17. These are laminated in this order from the inside to the surface. In the following, when the polarizing film 12a and the polarizing film 12b are not distinguished, they may simply be referred to as polarizing film 12. In this embodiment, the laminate of the anisotropic diffusion layer 16 and the low refractive index layer 17 is an example of a resin film. The laminate of the substrate 15, the anisotropic diffusion layer 16, and the low refractive index layer 17 is also an example of a resin film. In Figure 1(a), the directions that will be described later as upward, downward, left, and right are shown as up, down, left, and right, respectively. The portion of the liquid crystal display device 1a excluding the backlight unit 11 is sometimes referred to as the liquid crystal display panel. Specifically, the portion from the polarizing film 12a to the low refractive index layer 17 is sometimes called the liquid crystal display panel. In this case, the liquid crystal display panel is, for example, a VA-type liquid crystal panel. 【0019】 The backlight unit 11 is equipped with a light source that emits light as a backlight and irradiates the liquid crystal section 14 with light. The backlight unit 11 is, for example, a cold cathode fluorescent lamp or a white LED (Light Emitting Diode). Polarizing film 12a and polarizing film 12b are examples of polarization means for polarizing light. Polarizing film 12a and polarizing film 12b are configured so that their polarization directions are orthogonal to each other. Polarizing film 12a and polarizing film 12b include, for example, a resin film containing iodine compound molecules in polyvinyl alcohol (PVA). This is then sandwiched and bonded between resin films made of triacetylcellulose (TAC), polyethylene terephthalate (PET), and cycloolefin polymer (COP). The inclusion of iodine compound molecules causes the light to become polarized. 【0020】 The phase difference films 13a and 13b compensate for the viewing angle dependence of the liquid crystal display device 1a. The light transmitted through the liquid crystal section 14 changes its polarization state from linearly polarized to elliptically polarized. For example, when displaying black, the liquid crystal display device 1a appears black when viewed from a vertical direction. On the other hand, when the liquid crystal display device 1a is viewed from an oblique direction, retardation occurs in the liquid crystal section 14. Also, the axis of the polarizing film 12 is no longer 90°. As a result, light leakage occurs, and the contrast decreases. In other words, the liquid crystal display device 1a exhibits viewing angle dependence. The phase difference films 13a and 13b have the function of converting this elliptically polarized light back to linearly polarized light. In this way, the phase difference films 13a and 13b can compensate for the viewing angle dependence of the liquid crystal display device 1a. 【0021】 A power supply (not shown) is connected to the liquid crystal unit 14. When a voltage is applied using this power supply, the arrangement direction of the liquid crystals in the liquid crystal unit 14 changes. The liquid crystal unit 14 then controls the light transmission state. In a liquid crystal display device using a VA-type liquid crystal panel, when no voltage is applied to the liquid crystal section 14 (voltage OFF), the liquid crystal molecules are aligned vertically in the diagram. When light is shone from the backlight unit 11, the light first passes through the polarizing film 12a and becomes polarized. This polarized light then passes directly through the liquid crystal section 14. Furthermore, the polarizing film 12b blocks this polarization because its polarization direction is different. In this case, the user viewing the liquid crystal display device 1a cannot see this light. In other words, when no voltage is applied to the liquid crystal section 14, the color of the liquid crystal is "black". 【0022】 In contrast, when the maximum voltage is applied to the liquid crystal unit 14, the liquid crystal molecules are aligned horizontally in the diagram. The polarized light that passes through the polarizing film 12a has its polarization direction rotated by 90 degrees due to the action of the liquid crystal molecules. Therefore, the polarizing film 12b does not block this polarization but transmits it. In this case, the user viewing the liquid crystal display device 1a can see this light. That is, when the maximum voltage is applied to the liquid crystal unit 14, the color of the liquid crystal is "white". The voltage can also be set between the OFF voltage and the maximum voltage. In this case, the liquid crystal molecules are in a state between the vertical direction in the diagram and the direction perpendicular to the vertical direction in the diagram. That is, the liquid crystal molecules are aligned diagonally, which is a direction that intersects both the vertical and perpendicular directions. In this state, the color of the liquid crystal is "gray". Therefore, by adjusting the voltage applied to the liquid crystal unit 14 between OFF and the maximum voltage, intermediate gradations can be expressed in addition to black and white. This allows for the display of images. Although not shown in the diagram, it is also possible to display color images by using a color filter. 【0023】 Figure 2 shows the substrate 15, the anisotropic diffusion layer 16, and the low refractive index layer 17. In this diagram, the upper side is the surface side of the liquid crystal display device 1a, and the lower side is the interior side of the liquid crystal display device 1a. 【0024】 The substrate 15 is a support for forming the anisotropic diffusion layer 16 and the low refractive index layer 17. The substrate 15 is preferably a transparent substrate with a total light transmittance of 85% or more. For example, the substrate 15 can be triacetylcellulose (TAC) as described above. However, it is not limited to this, and polyethylene terephthalate (PET) or the like can also be used. The substrate 15 has a thickness of, for example, 20 μm to 200 μm. 【0025】 The anisotropic diffusion layer 16 diffuses light in an anisotropic direction. Here, "anisotropic diffusion" refers to the property of having strong light diffusion in a specific direction. The "anisotropic diffusion layer" is a diffusion layer that has strong light diffusion in a specific direction. When isotropic light (circular), such as laser light, is shone onto a component having an anisotropic diffusion layer, the transmitted light becomes linear or elliptical. The low refractive index layer 17 reduces the reflectivity of the liquid crystal display device 1a. The anisotropic diffusion layer 16 and the low refractive index layer 17 will be described in more detail later. 【0026】 <Explanation of the structure of the backlight unit 11> Next, we will explain the structure of the backlight unit 11 in more detail. Figure 3 shows the structure of the backlight unit 11. The illustrated backlight unit 11 comprises a light source 111, a diffuser plate 112, and a color conversion sheet 113. The backlight unit 11 further comprises a first lens sheet 114, a second lens sheet 115, and a reflective polarizing sheet 116. These are arranged in a stacked manner in the thickness direction. As will be described later in Figure 4(a), a first adhesive layer 117 is provided between the first lens sheet 114 and the second lens sheet 115. A second adhesive layer 118 is provided between the second lens sheet 115 and the reflective polarizing sheet 116. However, this is omitted in Figure 3. Furthermore, adhesive layers may be provided between other layers as well, but these are omitted in Figure 3. 【0027】 The light source 111 is a so-called backlight that emits light to allow the user to view the image through the liquid crystal unit 14. The light source 111 is, for example, a cold cathode fluorescent lamp. Alternatively, the light source 111 can be, for example, an LED element. Examples of backlight units 11 include a direct-lit type in which the light sources 111 are arranged in a planar manner, and an edge-lit type in which the light sources 111 are arranged at the edges of the backlight unit 11 and emit light from the surface using a light guide plate. When the light source 111 is a cold cathode fluorescent lamp, the light emitted from the cold cathode fluorescent lamp is usually white. When the light source 111 is an LED element, the light emitted from the LED element is usually white or blue. 【0028】 The diffuser plate 112 diffuses and transmits light emitted from the light source 111. As a result, the light transmitted through the diffuser plate 112 has a uniform brightness distribution, and brightness unevenness is reduced. The diffuser plate 112 is, for example, a film made of resin. This resin can be, for example, polycarbonate resin, polystyrene resin, acrylic resin, or polystyrene resin. By incorporating fillers with different refractive indices into this resin, light can be diffused. The fillers can be, for example, fine particles made of acrylic resin or polystyrene resin. In another form, the diffuser plate 112 is a sheet made of resin with a processed surface shape. Light can be diffused by the processed surface shape. 【0029】 The color conversion sheet 113 converts light from the light source 111 to any desired color. This expands the color reproduction range of the light. For example, if the color of the light source 111 is blue, the color conversion sheet 113 converts it to green or red. As a result, it can be mixed with the blue light from the light source 111, making the light emitted from the color conversion sheet 113 white. The color conversion sheet 113 is, for example, made by coating a transparent film with a resin in which a wavelength conversion material is dispersed. This wavelength conversion material is, for example, a phosphor or quantum dot. Actual examples of wavelength conversion materials include yttrium-aluminum-garnet phosphors activated with cerium, lutetium-aluminum-garnet phosphors activated with cerium, KSF phosphors, and quantum dot phosphors such as cadmium selenide and indium phosphide. In order to ensure the long-term stability of the color conversion sheet 113, it may be laminated with a gas barrier film as needed. Furthermore, if there is no need to convert the color of the light from the light source 111, the color conversion sheet 113 is unnecessary. 【0030】 The first lens sheet 114 and the second lens sheet 115 are examples of light-gathering units and lens sheets. The first lens sheet 114 and the second lens sheet 115 focus the light emitted from the light source 111 in the direction of the front of the liquid crystal display device 1a, which is the device itself. This "front direction" is the direction in which the user is positioned when an image is displayed on the liquid crystal display device 1a. Alternatively, the "front direction" can be said to be the normal direction (perpendicular direction) with respect to the display surface of the liquid crystal display device 1a. "Focusing light in the front direction" means reducing the angle of the light emitted from the light source 111, with the front direction being defined as 0°. For example, light emitted from the light source 111 at an angle of 50° with respect to the front direction is made to a 40° angle by passing it through the first lens sheet 114 or the second lens sheet 115. In this embodiment, "diagonal direction" means a direction other than the front direction. In other words, "diagonal direction" refers to a direction that is at an angle other than 0° when the front direction is defined as 0°. 【0031】 The reflective polarizing sheet 116 allows the first linearly polarized component to pass through and reflects the second linearly polarized component of light that is orthogonal to the first linearly polarized component. In this case, the first linearly polarized component is, for example, P-polarized, and the second linearly polarized component is, for example, S-polarized. The reflected second linearly polarized component is reflected by other optical components, etc., and re-incident to the reflective polarizing sheet 116 in a depolarized state. Then, it is transmitted or reflected again by the reflective polarizing sheet 116. By repeating this process, only the first linearly polarized component is transmitted from the reflective polarizing sheet 116. The polarization direction of the first linearly polarized component is then aligned with the transmission axis direction of the polarizing film 12a (see Figure 1(b)). This increases the amount of light that can be transmitted through the liquid crystal display device 1a, thereby improving brightness. As the reflective polarizing sheet 116, for example, a brightness-enhancing film DBEF manufactured by 3M can be used. Alternatively, a wire grid polarizer can be used as the reflective polarizing sheet 116. 【0032】 <Description of the first lens sheet 114 and the second lens sheet 115> Next, the first lens sheet 114 and the second lens sheet 115 will be described in more detail. Figures 4(a) to 4(c) show the structures of the first lens sheet 114 and the second lens sheet 115. Of these, Figure 4(a) is a view of the first lens sheet 114 and the second lens sheet 115 from the same direction as in Figure 2. That is, Figure 4(a) is a cross-sectional view of the first lens sheet 114 and the second lens sheet 115, and is an enlarged view of Figure 2. As shown in the figure, a first adhesive layer 117 is provided between the first lens sheet 114 and the second lens sheet 115. The first adhesive layer 117 is located on the light-emitting side relative to the first lens sheet 114. That is, in Figure 4(a), the first adhesive layer 117 is located on the surface side of the first lens sheet 114. In this case, the first adhesive layer 117 adheres the first lens sheet 114 and the second lens sheet 115. In addition, a second adhesive layer 118 is provided between the second lens sheet 115 and the reflective polarizing sheet 116. The second adhesive layer 118 is located on the light-emitting side relative to the second lens sheet 115. That is, in Figure 4(a), the second adhesive layer 118 is located on the surface side of the second lens sheet 115. In this case, the second adhesive layer 118 adheres the second lens sheet 115 to the reflective polarizing sheet 116. 【0033】 Figure 4(b) is a perspective view showing the surface shape of the second lens sheet 115. Figure 4(c) is a perspective view showing the surface shape of the first lens sheet 114. In Figures 4(b) and 4(c), the upper direction in the figures is the direction in which light passes through the first lens sheet 114 and the second lens sheet 115 and is emitted. In Figures 4(b) and 4(c), the directions that are up, down, left, and right when the liquid crystal display device 1a is actually used are shown as up, down, left, and right, respectively. 【0034】 As shown in Figures 4(b) to 4(c), the first lens sheet 114 and the second lens sheet 115 have multiple lenses arranged in a planar manner. The first lens sheet 114 and the second lens sheet 115 concentrate the light emitted from the light source 111 in the forward direction as described above. At this time, when an image is displayed, the light concentration in the left-right direction is different from the light concentration in the up-down direction. More specifically, when an image is displayed, the light concentration in the up-down direction is higher than the light concentration in the left-right direction. This is achieved by arranging the first lens sheet 114 and the second lens sheet 115, which has higher light concentration than the first lens sheet 114. In other words, due to the difference in the light concentration of these lens sheets, the light concentration in the direction in which the field of view is to be widened is reduced, among the left-right and up-down directions. In this case, the light concentration in the up-down direction is higher than the light concentration in the left-right direction. This allows the amount of light focused in front to be adjusted by increasing the light-gathering ability of the second lens sheet 115 compared to the first lens sheet 114. Furthermore, the left-right direction coincides with the direction the user perceives as left-right when looking at the liquid crystal display 1a of the display device 1. Similarly, the up-down direction coincides with the direction the user perceives as up-down when looking at the liquid crystal display 1a of the display device 1. 【0035】 Figures 5(a) to 5(c) show the types of lens sheets used as the first lens sheet 114 and the second lens sheet 115. These lens sheets each have a different surface shape. And these differences in surface shape result in differences in the degree to which they concentrate light. Figure 5(a) illustrates a prism sheet. The prism sheet has a triangular cross-sectional shape on its surface, with multiple projections T1 extending in one direction. The multiple projections T1 are almost parallel to each other and arranged in a ridge-like pattern. The cross-sectional shape of the multiple projections T1 can also be described as serrated. The prism sheet has the highest light-gathering ability when the vertex angle A of the triangle is 90°. Therefore, in the case of a prism sheet, the light-gathering ability decreases as the vertex angle A becomes larger than 90°. Conversely, the light-gathering ability also decreases as the vertex angle A becomes smaller than 90°. Furthermore, the period of these multiple protrusions T1 is, for example, between 30 μm and 500 μm. In other words, for example, the portions forming the vertex angle A of the triangular shape are arranged at intervals of 30 μm to 500 μm in a direction perpendicular to the aforementioned one direction. 【0036】 Figure 5(b) illustrates a lenticular sheet. The lenticular sheet has a semicircular cross-sectional shape on its surface, and is provided with multiple projections T2 extending in one direction. That is, each projection T2 is semicircular in shape. The multiple projections T2 are approximately parallel to each other and arranged in a ridge-like pattern. 【0037】 Figure 5(c) illustrates a microlens array sheet. The illustrated microlens array has a semicircular surface cross-section, and is provided with multiple protrusions T3 that are circular when viewed from above. That is, each protrusion T3 is hemispherical in shape. The multiple protrusions T3 are arranged in a staggered pattern when viewed from above. 【0038】 Furthermore, the heights of the protrusions T1 to T3 can be approximately the same. For example, the height from the lowest point to the highest point can be 60 μm, however, it is not limited to this, and a configuration with multiple heights is also possible. For example, protrusions T1 to T3 with a height of 60 μm and protrusions T1 to T3 with a height of 70 μm may be mixed together. However, in this case, it is preferable that the multiple heights have periodicity. For example, a structure can be created in which two consecutive protrusions T1 to T3 with a height of 60 μm are provided, followed by one protrusion T1 to T3 with a height of 70 μm, and this pattern is repeated. 【0039】 Among the lens sheets shown in Figures 5(a) to (c), prism sheets generally have the highest light-gathering ability, while microlens array sheets have the lowest. Lenticular sheets have a light-gathering ability intermediate between prism sheets and microlens array sheets. In other words, the order of light-gathering ability from highest to lowest is prism sheet, lenticular sheet, and microlens array sheet. Note that the difference in light-gathering ability depends on the refractive index of the resin that forms the protrusions T1 to T3 on the surface of the lens sheet. It also depends on the pitch and height of the pattern of the protrusions T1 to T3. Therefore, this order is only a general one, and the order may change depending on the material and shape of the protrusions T1 to T3. 【0040】 The first lens sheet 114 and the second lens sheet 115 can be selected from these three types. However, the selection is not limited to these three types, and other types of lens sheets may also be used. The second lens sheet 115 has higher light-gathering properties than the first lens sheet 114. That is, the second lens sheet 115 gathers more light in the forward direction than the first lens sheet 114. As a result, the light-gathering properties of the liquid crystal display device 1a in the vertical direction become higher than the light-gathering properties in the horizontal direction. Therefore, in this embodiment, for example, as shown in Figure 4(c), a lenticular sheet is selected as the first lens sheet 114. Also, for example, as shown in Figure 4(b), a prism sheet is selected as the second lens sheet 115. 【0041】 Furthermore, among the left-right and up-down directions, the direction with lower light focusing is preferably the direction in which the anisotropic diffusion layer 16 anisotropically diffuses light. In other words, the direction in which the first lens sheet 114, which has lower light focusing ability than the second lens sheet 115, focuses light is the left-right direction. And it is also preferable that the direction in which the anisotropic diffusion layer 16 anisotropically diffuses light is the left-right direction. That is, the direction in which light focusing ability is lower is aligned with the direction in which the anisotropic diffusion layer 16 diffuses light. 【0042】 Furthermore, the light-gathering properties of the lens sheet on the light source 111 side can be controlled by adjusting the thickness of the first adhesive layer 117 and the second adhesive layer 118. In other words, the light-gathering properties of the first lens sheet 114 can be controlled by adjusting the thickness of the first adhesive layer 117. Similarly, the light-gathering properties of the second lens sheet 115 can be controlled by adjusting the thickness of the second adhesive layer 118. In this case, as the thickness of the first adhesive layer 117 and the second adhesive layer 118 is reduced, the light-gathering ability of the lens sheet on the light source 111 side increases. Conversely, as the thickness of these adhesive layers increases, the light-gathering ability of the lens sheet on the light source 111 side decreases. In the case of Figure 4(a), the lens sheet on the light source 111 side of the first adhesive layer 117 is the first lens sheet 114. The lens sheet on the light source 111 side of the second adhesive layer 118 is the second lens sheet 115. In other words, increasing the thickness of these adhesive layers reduces the light-gathering ability caused by the surface shape of the lens sheet shown in Figures 5(a) to (c). For example, if the adhesive layer bonded to the prism sheet shown in Figure 5(a) is made thicker, the triangular surface shape can be considered to have become a trapezoidal shape with a flat top surface. In this case, the light-gathering ability decreases. 【0043】 Therefore, for example, the following may be done: the first lens sheet 114 and the second lens sheet 115 are both made of the same type of lens sheet. For example, both are made of prism sheet. The thickness of the first adhesive layer 117 and the second adhesive layer 118 is used to control the light-gathering properties in the left-right direction and the up-down direction. When the first adhesive layer 117 is provided, the thickness of the first adhesive layer 117 controls the light-gathering properties of the first lens sheet 114. On the other hand, when the second adhesive layer 118 is provided, the thickness of the second adhesive layer 118 controls the light-gathering properties of the second lens sheet 115. This reduces the light-gathering properties in the direction in which the field of view is to be widened, among the left-right and up-down directions. In this embodiment, the light-gathering ability in the vertical direction is made higher than the light-gathering ability in the horizontal direction. In this case, the thickness of the first adhesive layer 117 is made greater than the thickness of the second adhesive layer 118. This makes the light-gathering ability of the liquid crystal display device 1a in the vertical direction higher than the light-gathering ability in the horizontal direction. If you want to increase the light-gathering ability, it is preferable to make the thickness of these adhesive layers less than 10 μm. It is even more preferable to make the thickness of these adhesive layers between 1 μm and 9 μm. And it is even more preferable to make the thickness of these adhesive layers between 3 μm and 7 μm. By keeping the thickness of these adhesive layers within this range, it is possible to ensure high light-gathering ability while maintaining adhesive strength. Conversely, if you want to decrease the light-gathering ability, it is preferable to make the thickness of these adhesive layers 10 μm or more. It is even more preferable to make the thickness of these adhesive layers 13 μm or more. Therefore, in this embodiment, it is preferable that the thickness of the first adhesive layer 117 be 10 μm or more. It is also preferable that the thickness of the second adhesive layer 118 be less than 10 μm. Alternatively, the first adhesive layer 117 may be provided, but the second adhesive layer 118 may be omitted. In this case, the thickness of the second adhesive layer 118 can be said to be 0 μm. That is, the light-gathering ability of the first lens sheet 114 is controlled by the thickness of the first adhesive layer 117. On the other hand, the light-gathering ability of the second lens sheet 115 is not controlled by the second adhesive layer 118. Even with this method, it is possible to make the light-gathering ability in the vertical direction higher than the light-gathering ability in the horizontal direction. 【0044】 In the example described above, the first lens sheet 114 was positioned closer to the light source 111 than the second lens sheet 115. However, this is not the only option; the second lens sheet 115 may also be positioned closer to the light source 111 than the first lens sheet 114. In other words, the layering order of the first lens sheet 114 and the second lens sheet 115 may be reversed. In this case, the first adhesive layer 117 adheres the first lens sheet 114 to the reflective polarizing sheet 116. On the other hand, the second adhesive layer 118 adheres the first lens sheet 114 to the second lens sheet 115. Furthermore, the light-gathering properties can be further controlled by other factors such as the periodic interval of the lens in the lens sheet, the pattern aspect ratio, and the angle of the apex angle A of the prism sheet. For example, both the first lens sheet 114 and the second lens sheet 115 use prism sheets. The apex angle A of the prism sheet used in the first lens sheet 114 is set to an angle less than 83° or greater than 97°. The apex angle of the prism sheet used in the second lens sheet 115 is set to an angle between 83° and 97°. However, changing the thickness of the first adhesive layer 117 and the second adhesive layer 118 makes it easier to control the light-gathering properties. The first adhesive layer 117 and the second adhesive layer 118 can be provided at the top of the lens, as shown in Figure 4(a). Furthermore, it is not necessary to provide the first adhesive layer 117 and the second adhesive layer 118 all the way down to the bottom of the lens. 【0045】 Furthermore, it is preferable that the thickness of the first adhesive layer 117 is greater than the thickness of the second adhesive layer 118. More preferably, the thickness of the first adhesive layer 117 is 1.5 times or more the thickness of the second adhesive layer 118. This further increases the light-gathering ability in the vertical direction compared to the light-gathering ability in the horizontal direction. In other words, the difference between the light-gathering ability in the vertical direction and the light-gathering ability in the horizontal direction becomes even larger. 【0046】 Furthermore, we consider the full width at half maximum (FWHM) of the luminance distribution, which is the relationship between the angle relative to the front direction and the luminance, in both the left-right and up-down directions. This FWHM is an indicator of the light-gathering ability in the left-right and up-down directions. In the liquid crystal display device 1a of this embodiment, this FWHM is larger in the left-right direction than in the up-down direction when an image is displayed. Preferably, the difference between these FWHMs is 7° or more. Hereafter, the FWHM may be referred to as "FWHM (Full Width Half Maximum)". Also, hereafter, the difference between the FWHMs of the luminance distribution in the left-right and up-down directions may be referred to as "ΔFWHM". 【0047】 Figure 6 shows the luminance distribution, which is the relationship between the angle relative to the front direction and the luminance. Here, the horizontal axis represents the angle relative to the front direction, that is, the angle when the front direction is set to 0°. The vertical axis represents the luminance. Here, the luminance distribution is shown when the first lens sheet 114 and the second lens sheet 115 are provided. In this case, the front luminance, which is the luminance in the front direction, is the largest. The luminance distribution is shown when the front luminance is normalized to 1.0 in the left / right and up / down directions. Note that when measuring the luminance distribution, the configuration that diffuses light in the characteristic direction, such as the anisotropic diffusion layer 16 described above, is not used. The solid line shows the luminance distribution in the left-right direction. In other words, it shows an example of the luminance distribution of light emitted from the backlight unit 11. The dotted line shows the luminance distribution in the up-down direction. 【0048】 In Figure 6, the horizontal half-width (FWHM) shown by the solid line is denoted by L1. Also in Figure 6, the vertical half-width (FWHM) shown by the dotted line is denoted by L2. The difference between these half-widths (ΔFWHM) is the difference between L1 and L2 (L1-L2), which in this case is approximately 10°. In this embodiment, it is preferable that this difference is 7° or more. 【0049】 <Explanation of Anisotropic Diffusion Layer 16> Next, we will explain the anisotropic diffusion layer 16 in more detail. Figures 7(a) to 7(e) illustrate various configurations of the anisotropic diffusion layer 16. In Figures 7(a) to 7(e), the materials constituting the anisotropic diffusion layer 16 are shown as "Matrix". Furthermore, in Figures 7(a) to 7(e), materials that anisotropically diffuse light and have an anisotropic shape are shown as "Anisotropic Shape". In addition, in Figures 7(a) to 7(e), the degree to which light is anisotropically diffused is shown as "Anisotropic Diffusivity". Figure 7(a) shows an example in which the substrate 15, anisotropic diffusion layer 16, hard coat layer 18, and low refractive index layer 17 are laminated in this order. Here, the hard coat layer 18 and the low refractive index layer 17 may be present separately; in other words, the hard coat layer 18 may be omitted. In the figure, it is represented as LR(+HC)(17(18)). As the base material 15, triacetylcellulose (TAC) film or super-birefringent polyethylene terephthalate (PET) film is used to eliminate coloration (rainbow unevenness) caused by birefringence. When a hard coat layer 18 is provided, the strength of the resin film can be improved. Preferably, the refractive index of the hard coat layer 18 is 1.54 or higher. This reduces reflectivity compared to the case with only the low refractive index layer 17, and thus provides superior anti-reflection properties. The base material 15, base material layer 21, anisotropic diffusion layer 16, and low refractive index layer 17 (+ hard coat layer 18) are formed, for example, by coating. 【0050】 Figure 7(b) shows an example in which the substrate 15, anisotropic diffusion layer 16, substrate layer 21, and low refractive index layer 17 (+ hard coat layer 18) are laminated in this order. The anisotropic diffusion layer 16 contains an adhesive resin and is adhesive. The anisotropic diffusion layer 16 also plays a role in bonding the anti-reflective film, which is composed of the substrate layer 21, the low refractive index layer 17, and the hard coat layer 18, to the substrate 15, which is a polarizing plate protective film. 【0051】 Figure 7(c) shows an example in which anisotropic diffusion layer 16, hard coat layer 18, and low refractive index layer 17 are laminated in this order. The anisotropic diffusion layer 16 is a substrate with anisotropic diffusion function. The hard coat layer 18 and the low refractive index layer 17 are coated onto the substrate with anisotropic diffusion function to create a surface protective substrate with anti-reflective function. The anisotropic diffusion layer 16 shown in Figures 7(a) to 7(c) comprises a resin portion 161 and anisotropic particles 162, as will be described in more detail later. 【0052】 Figure 7(d) shows an example in which a substrate 15, anisotropic diffusion layer 16, and low refractive index layer 17 (+ hard coat layer 18) are laminated in this order. The anisotropic diffusion layer 16 is formed of a core layer 163 containing voids 163a and a skin layer 164 to protect the core layer 163. The voids 163a in the core layer 163 are crazes with a substantially linear shape and are formed by craze processing or the like. Incident light is diffused anisotropically at the interface between the resin forming the core layer 163 and the voids, contributing to an expanded viewing angle. Specific examples include Examples 1 to 5 in International Publication No. 2019 / 156003. 【0053】 Figure 7(e) shows an example in which a substrate 15, a substrate layer 21, an anisotropic diffusion layer 16, and a low refractive index layer 17 (+ hard coat layer 18) are laminated in this order. The anisotropic diffusion layer 16 has an uneven interface 165 within the layer. The interface 165 is formed of resins with different refractive indices. Therefore, incident light is refracted and diffracted at the interface, causing anisotropic diffusion and contributing to an expanded field of view. A specific example is the example described in Japanese Patent Application Publication No. 2020-16881. 【0054】 In this embodiment, it is preferable that the anisotropic diffusion is relatively low. In the example shown in Figure 7, it is preferable that the anisotropic diffusion is "low to medium". In this case, it is more suitable as a combination with the first lens sheet 114 and the second lens sheet 115 described above. As for the anisotropic diffusion layer 16, among those shown in Figures 7(a) to (e), the configurations shown in Figures 7(a) to (c) are preferred. That is, it is preferable that the anisotropic diffusion layer 16 includes a resin portion 161 and anisotropic particles 162. The anisotropic diffusion layer 16 with this configuration will be described in detail below. 【0055】 Figures 8(a) to 8(c) illustrate the anisotropic diffusion layer 16. Of these, Figure 8(a) is a view of the anisotropic diffusion layer 16 from direction VIII in Figure 2. As shown in Figures 2 and 8(a), the anisotropic diffusion layer 16 comprises at least a resin portion 161 and anisotropic particles 162. The resin portion 161 is made of resin with anisotropic particles 162 dispersed within it. Therefore, the resin portion 161 can also be described as a dispersion layer that fixes the anisotropic particles 162 so that their long axis is aligned in one direction. The anisotropic particles 162 have an anisotropic shape and are arranged in one direction along their long axis within the resin portion 161. In this case, as shown in Figure 2, the anisotropic particles 162 are arranged along the in-plane direction of the anisotropic diffusion layer 16 along their long axis. Also in this case, as shown in Figure 8(a), they are arranged along the vertical direction in the figure. 【0056】 The resin part 161 is made of resin as described above. It is preferable that the refractive index of the resin part 161 is between 1.45 and 1.65. The SCE (Specular Component Exclude), which is the reflectance of the anisotropic diffusion layer 16 excluding the specular reflection component, is preferably 1.0% or less. By setting the refractive index of the resin part 161 within this range, it becomes easier to achieve an SCE of 1.0% or less. Conversely, if it falls outside this range, it becomes easier for the SCE to exceed 1.0%. Furthermore, it is preferable that the difference in refractive index between the resin portion 161 and the low refractive index layer 17 is 0.1 or greater. By increasing the difference in refractive index between the resin portion 161 and the low refractive index layer 17, the reflectance can be further reduced. 【0057】 For example, (meth)acrylic resin, polyethylene resin, or polypropylene resin can be used as the resin constituting the resin part 161. Alternatively, for example, polystyrene resin, polyurethane resin, polycarbonate resin, polyester resin, or silicone resin can be used. Furthermore, adhesive resins such as acrylic adhesive resin can also be used. 【0058】 The anisotropic particles 162 have an anisotropic shape, and their refractive indices in the long axis direction and the short axis direction are different. This results in anisotropic diffusion in the anisotropic diffusion layer 16. Furthermore, the refractive index of the anisotropic particles 162 is different from that of the resin part 161. The shape of the anisotropic particles 162 is not particularly limited as long as it is anisotropic. For example, it may be spindle-shaped, needle-shaped, fibrous-shaped, cylindrical, disc-shaped, etc. 【0059】 Figures 8(b) and (c) show the refractive index of the anisotropic particle 162. Here, the refractive index of the anisotropic particle 162 in the direction of the long axis is n. ax , the refractive index in the short axis direction is n ay The refractive index of the resin part 161 is n b In this case, when the anisotropic diffusion direction is the transverse direction in the figure, the refractive index n is as shown in Figure 8(b). ax and refractive index n b A smaller difference is preferable. Also, in the case of Figure 8(c), the refractive index n ay and refractive index n b A smaller difference is preferable. That is, the refractive index n of the anisotropic particle 162 in the direction perpendicular to the anisotropic diffusion direction. ax , n ay And the refractive index n of the resin part 161 b A smaller difference is preferable. More specifically, it is preferable that at least one of the following relationships (I) and (II) holds. By keeping the refractive index of the anisotropic particles 162 and the resin portion 161 within the following range, backscattering in the direction perpendicular to the anisotropic diffusion direction is suppressed. This makes it possible to lower the SCE of the anisotropic diffusion layer 16. 【0060】 (I)|n b -n ax |<0.04 and 0.04<|n b -n ay |<0.50 (II)|n b -n ay |<0.04 and 0.04<|n b -n ax |<0.50 【0061】 Furthermore, in order to keep the SCE of the anisotropic diffusion layer 16 below 1.0%, it is preferable that the length and aspect ratio of the anisotropic diffusion layer 16 be within the following range. If these ranges are exceeded, the SCE is more likely to exceed 1.0%. Specifically, it is preferable that the anisotropic particles 162 have a length in the longitudinal direction of 0.5 μm or more and 500 μm or less. Furthermore, it is even more preferable that the anisotropic particles 162 have a length in the longitudinal direction of 1 μm or more and 200 μm or less. Furthermore, it is preferable that the anisotropic particles 162 have a length in the short axis direction of 0.05 μm or more and 30 μm or less. It is even more preferable that the anisotropic particles 162 have a length in the short axis direction of 0.1 μm or more and 10 μm or less. By making the anisotropic particles 162 of this size, good anisotropic diffusion is ensured while suppressing backscattering at the interface between the anisotropic particles 162 and the resin part 161, making it easier to reduce the SCE of the anisotropic diffusion layer. 【0062】 Furthermore, it is preferable that the aspect ratio, which is the ratio of the length in the long axis direction to the length in the short axis direction of the anisotropic particle 162, be 10 or more. It is even more preferable that the aspect ratio be 20 or more. By setting the aspect ratio of the anisotropic particle 162 within this range, it becomes easier to ensure anisotropic diffusion that can improve the viewing angle characteristics of the display. 【0063】 Furthermore, from a similar viewpoint, it is preferable that the interface between the anisotropic particles 162 and the resin portion 161 is compatible. This allows the refractive index at the interface between the two to change continuously, thereby reducing backscattering. This also makes it easier to further reduce the SCE. In this case, the boundary between the anisotropic particles 162 and the resin portion 161 is ambiguous because they are compatible. However, even in this case, it is clear that the anisotropic particles 162 exist as particles within the resin portion 161. Methods for making the interface compatible include incorporating a compatible agent. Also, as will be described in more detail later, one method is to incorporate a solvent that dissolves the components of the anisotropic particles 162 when applying (coating) the coating solution that creates the anisotropic diffusion layer 16. The compatibility of the interface can be confirmed by scanning electron microscopy (SEM) of the cross-section of the anisotropic diffusion layer 16. 【0064】 The anisotropic particles 162 include, for example, at least one of metal oxides, carbonate compounds, hydroxide compounds, and phosphate compounds. Examples of metal oxides include silica, titanium oxide, aluminum oxide, and zinc oxide. Other examples of anisotropic particles 162 include compounds such as calcium carbonate, silicon carbide, nitrogen carbide, and basic magnesium sulfate. Other examples of anisotropic particles 162 include glass fibers, (meth)acrylic resin, polystyrene resin, and melamine resin. Alternatively, anisotropic particles may be compounded and then subjected to extrusion melting or stretching to form anisotropic particles 162. 【0065】 The anisotropic diffusion layer 16 preferably has a haze value of 20% to 80%. More preferably, the haze value is between 30% and 65%. This makes it possible to ensure sharp image quality with less glare when the anisotropic diffusion layer 16 is mounted on a display. 【0066】 The anisotropic diffusion of the anisotropic diffusion layer 16 can be measured using a goniophotometer. When light is shone onto the anisotropic diffusion layer 16 at an incident angle of 0° (perpendicular direction), the transmitted light is acquired while changing the receiving angle. This allows for the measurement of the intensity distribution of the transmitted and scattered light. By acquiring this data in the anisotropic diffusion direction and in a direction perpendicular to the anisotropic diffusion direction, the anisotropic diffusion can be quantitatively evaluated. In this embodiment, the anisotropic diffusion is evaluated using the degree of anisotropic diffusivity (ADV). The degree of anisotropic diffusivity can be calculated using the following formula. Preferably, the anisotropic diffusion layer 16 has an ADV of 3 or higher. More preferably, the ADV is 15 or higher, and even more preferably 25 or higher. 【0067】 ADV = (Amount of light transmitted at 5° in the anisotropic diffusion direction, measured with a variable-angle photometer) / (Amount of light transmitted at 5° in the direction perpendicular to the anisotropic diffusion direction, measured with a variable-angle photometer) 【0068】 <Explanation of the low refractive index layer 17> Next, we will explain the low refractive index layer 17 in more detail. The low refractive index layer 17 is a functional layer for reducing the reflectivity of the liquid crystal display device 1a. The low refractive index layer 17 has a low refractive index. Specifically, the low refractive index layer 17 needs to have a refractive index of 1.40 or less. It is also preferable that the refractive index be between 1.20 and 1.35. This enables the realization of a liquid crystal display device 1a with low reflectivity. The low refractive index layer 17 may be formed as a single layer or as multiple layers, but from the viewpoint of manufacturing cost, it is preferable to form it with as few layers as possible. The low refractive index layer 17 preferably has a thickness of 50 nm or more and 500 nm or less. 【0069】 The low refractive index layer 17 includes a binder 171 and hollow silica particles 172 distributed within the binder 171. The low refractive index layer 17 further includes a surface modifier 173 mainly distributed on the surface side of the binder 171. 【0070】 The binder 171 has a mesh structure that connects the hollow silica particles 172 to each other. The binder 171 mainly contains a resin. The resin may contain a fluororesin. In this case, the resin may be entirely a fluororesin, or part of it may be a fluororesin. A fluororesin is a resin that contains fluorine, such as polytetrafluoroethylene (PTFE). Another example is perfluoroalkoxyalkane (PFA). Furthermore, examples include perfluoroethylenepropene copolymer (FEP) and ethylenetetrafluoroethylene copolymer (ETFE). Fluorine-containing resins have a low refractive index. Therefore, by using a fluororesin, the low refractive index layer 17 can easily have an even lower refractive index, and the reflectance can be further reduced. 【0071】 The hollow silica particles 172 have an outer shell layer, and the interior of the outer shell layer is hollow or porous. The outer shell layer and the porous body are mainly composed of silicon dioxide (SiO2). In addition, numerous photopolymerizable groups and hydroxyl groups are bonded to the surface side of the outer shell layer. The photopolymerizable groups and the outer shell layer are bonded via at least one of the following bonds: Si-O-Si bonds and hydrogen bonds. Examples of photopolymerizable groups include acryloyl groups and methacryloyl groups. That is, the hollow silica particles 172 contain at least one of acryloyl groups and methacryloyl groups as photopolymerizable groups. Photopolymerizable groups are also called ionizing radiation curable groups. The hollow silica particles 172 only need to have at least photopolymerizable groups, and the number and type of these functional groups are not particularly limited. 【0072】 The average primary particle diameter of the hollow silica particles 172 is preferably between 35 nm and 120 nm. More preferably, the average primary particle diameter of the hollow silica particles 172 is between 50 nm and 100 nm. If the average primary particle diameter is less than 35 nm, the porosity of the hollow silica particles 172 tends to be small. Therefore, the effect of lowering the refractive index of the low refractive index layer 17 becomes less pronounced. Also, if the median particle size exceeds 120 nm, the surface irregularities of the low refractive index layer 17 tend to become more pronounced. Therefore, the stain resistance and scratch resistance tend to decrease. 【0073】 The surface modifier 173 is mainly distributed on the surface side of the binder 171 and modifies the surface of the low refractive index layer 17. In other words, the surface modifier 173 is segregated on the surface side of the low refractive index layer 17. Even if it is present inside the binder 171, it does not impair the function of the low refractive index layer 17. In this embodiment, the surface modifier 173 may include an oil-repellent surface modifier and an oil-lipid surface modifier. 【0074】 The oil-repellent surface modifier is incorporated into binder 171, etc., and segregates onto the surface, thereby improving the oil repellency of the film surface. The oil-repellent surface modifier is preferably a fluorine-based compound having a photopolymerizable group. Specific examples of oil-repellent surface modifiers include, for example, KY-1203 and KY-1207 from Shin-Etsu Chemical Co., Ltd., Optool DAC-HP from Daikin Industries, Ltd., Megafac F-477, F-554, F-556, F-570, RS-56, RS-58, RS-75, RS-78, and RS-90 from DIC Corporation, FS-7024, FS-7025, FS-7026, FS-7031, and FS-7032 from Fluorotechnology Ltd., H-3593 and H-3594 from Daiichi Kogyo Seiyaku Co., Ltd., SURECO AF Series from AGC Inc., and Futergent F-222F, M-250, 601AD, and 601ADH2 from Neos Corporation. 【0075】 Lipophilic surface modifiers, when incorporated into binder 171 and other materials, play a role in improving the lipophilicity of the film surface by segregating onto the surface. Specific examples of lipophilic surface modifiers include, for example, Mercuria 350L manufactured by Sanyo Chemical Industries, Ltd., and, for example, Futergent 730LM, 602A, 650A, and 650AC manufactured by Neos Corporation. 【0076】 <Explanation of the resin film structure> Furthermore, the structure of the resin film in this embodiment is not limited to the configuration shown in Figure 2. Figures 9(a) to 9(e) show examples of the composition of the resin film. Of these, Figure 9(a) is the same as in Figure 2, where the substrate 15, anisotropic diffusion layer 16, and low refractive index layer 17 are laminated in this order. Figure 9(b) shows an example in which the substrate 15, anisotropic diffusion layer 16, hard coat layer 18, and low refractive index layer 17 are laminated in this order. That is, compared to the case in Figure 9(a), the hard coat layer 18 is formed between the anisotropic diffusion layer 16 and the low refractive index layer 17. In this case, the strength of the resin film can be improved. The refractive index of the hard coat layer 18 is preferably 1.54 or higher. This makes it possible to reduce the reflectivity compared to the case with only the low refractive index layer 17, and to provide better anti-reflection properties. 【0077】 Figure 9(c) shows an example in which the substrate 15, anisotropic diffusion layer 16, hard coat layer 18, high refractive index layer 19, and low refractive index layer 17 are laminated in this order. That is, compared to the case in Figure 9(b), the high refractive index layer 19 is formed between the hard coat layer 18 and the low refractive index layer 17. The high refractive index layer 19 is a layer with a higher refractive index than the low refractive index layer 17. The refractive index of the high refractive index layer 19 is preferably 1.60 or higher. This makes it possible to reduce the reflectivity compared to the case with only the low refractive index layer 17, and to provide better anti-reflection properties. 【0078】 Figure 9(d) shows an example in which the anisotropic diffusion layer 16, substrate 15, hard coat layer 18, high refractive index layer 19, and low refractive index layer 17 are laminated in this order. In other words, compared to Figure 9(a), this shows the case where the anisotropic diffusion layer 16 is moved inward relative to the substrate 15. In this case, it can also be said that the substrate 15 is provided between the low refractive index layer 17 and the anisotropic diffusion layer 16. 【0079】 Figure 9(e) shows the case where the substrate 15 is given the function of an anisotropic diffusion layer 16. In other words, it shows the case where anisotropic particles 162 are dispersed in the resin that makes up the substrate 15. In this case, it can also be said that the anisotropic diffusion layer 16 functions as the substrate 15 that supports the low refractive index layer 17. 【0080】 The hard coat layer 18 is a functional layer designed to make the liquid crystal display device 1a less susceptible to scratches. The hard coat layer 18 consists of, for example, a binder as a base material, primarily composed of resin. The binder can be the same as that exemplified in the low refractive index layer 17. In addition to the binder, metal oxide particles can also be included. Examples of metal oxide particles that can be used include zirconium oxide, tin oxide, titanium oxide, cerium oxide, and magnesium oxide. This improves the hard coating properties of the hard coat layer 18. Furthermore, conductive materials may be added. Examples of conductive materials include metal nanoparticles and conductive polymers. More specifically, conductive materials include tin oxide doped with antimony (Sb), phosphorus (P), and indium (In), ionic liquids containing fluorine-based anions or ammonium salts, conductive polymers such as PEDOT / PSS, and carbon nanotubes. In addition, two or more types of conductive materials may be added, rather than just one. This lowers the surface resistance of the hard coat layer 18 and provides the hard coat layer 18 with an antistatic function. 【0081】 To reduce the reflectivity of the liquid crystal display device 1a, the refractive index of the hard coat layer 18 is preferably between 1.48 and 1.65. More preferably between 1.50 and 1.60, and even more preferably between 1.54 and 1.56. It is possible to reduce reflectivity by increasing the refractive index of the hard coat layer 18. On the other hand, if the refractive index of the hard coat layer 18 is too high, the angular dependence of the reflectivity deteriorates and it becomes difficult to adjust the color perception. Furthermore, the thickness of the hard coat layer 18 is preferably 0.5 μm or more and 20 μm or less. More preferably, the thickness of the hard coat layer 18 is 3 μm or more and 10 μm or less. 【0082】 The high refractive index layer 19 is a functional layer provided below the low refractive index layer 17 to further reduce reflectivity. The high refractive index layer 19 comprises a binder and high refractive index particles. The high refractive index layer 19 can be formed, for example, from a coating solution containing the binder and high refractive index particles. The high refractive index layer 19 may be formed as a single layer or as multiple layers, but from the viewpoint of manufacturing cost, it is preferable to form it with as few layers as possible. 【0083】 In order to reduce the reflectivity of the liquid crystal display device 1a, it is preferable to increase the refractive index of the high refractive index layer 19. Specifically, a refractive index of 1.55 or more and 1.80 or less is preferred, and 1.60 or more and 1.75 or less is more preferred. Furthermore, the upper limit of the thickness of the high refractive index layer 19 is preferably 500 nm or less. More preferably 350 nm or less, and even more preferably 200 nm or less. The lower limit of the thickness of the high refractive index layer 19 is preferably 50 nm or more. More preferably 80 nm or more, and even more preferably 100 nm or more. 【0084】 Examples of high refractive index particles include zirconium oxide, hafnium oxide, tantalum oxide, titanium oxide, zinc oxide, aluminum oxide, magnesium oxide, tin oxide, yttrium oxide, barium titanate, antimond-doped tin oxide (ATO), phosphorus-doped tin oxide (PTO), indium-doped tin oxide (ITO), and zinc sulfide. From the viewpoint of durability and stability, zirconium oxide, barium titanate, antimond-doped tin oxide (ATO), phosphorus-doped tin oxide (PTO), and indium-doped tin oxide (ITO) are particularly preferred. 【0085】 <Explanation of how to create a resin film> Next, we will explain how to create a layered resin film as shown in Figure 2. Figure 10(a) is a flowchart showing a method for creating a layered resin film as shown in Figure 2. First, an anisotropic diffusion layer 16 is created (Step 101: Anisotropic diffusion layer creation step). The anisotropic diffusion layer 16 may be coated onto the substrate 15, or an anisotropic diffusion film may be formed by melt extrusion or the like. Furthermore, the anisotropic diffusion layer 16 is stretched as needed (Step 102: Stretching step). By stretching the anisotropic diffusion layer 16, the orientation of the anisotropic particles 162 is improved, and the anisotropic diffusion properties can be enhanced. In addition, by stretching the anisotropic diffusion layer 16 containing organic particles such as (meth)acrylic resin, polystyrene resin, and melamine resin near the glass transition temperature of the resin, the organic particles become anisotropic in shape, and the anisotropic diffusion properties are greatly improved. That is, before stretching, it is an isotropic diffusion film containing isotropic particles. When stretched, the isotropic particles change into anisotropic particles 162. As a result, it becomes an anisotropic diffusion film containing anisotropic particles 162. 【0086】 Furthermore, a low refractive index layer 17 is created on the anisotropic diffusion layer 16 (Step 103: Low refractive index layer creation step). 【0087】 Furthermore, each of the anisotropic diffusion layer 16 and the low refractive index layer 17 can be fabricated by the following methods. Figure 10(b) is a flowchart illustrating the method for creating the anisotropic diffusion layer 16 and the low refractive index layer 17. First, prepare the coating solutions for forming each layer (Step 201: Preparation). Here, "preparation" includes not only preparing by creating the coating solutions, but also preparing by purchasing the coating solutions. 【0088】 The coating solution consists of a solid component and a solvent. When creating the anisotropic diffusion layer 16, the solid content includes monomers, oligomers, and polymers that form the basis of the resin portion 161. The solid content also includes anisotropic particles 162. The monomers and / or oligomers polymerize to become the resin contained in the resin portion 161. In this embodiment, polymerization is carried out by photopolymerization, thermal polymerization, etc. Hereafter, these monomers and / or oligomers may be referred to as "binder components". When creating the low refractive index layer 17, the solid content includes binder components that form the basis of the binder 171. The solid content also includes hollow silica particles 172 and a surface modifier 173. Furthermore, each layer contains a photopolymerization initiator as a solid component. Additionally, the solid component may include a dispersant, an antifoaming agent, an ultraviolet absorber, a leveling agent, and the like. Then, by adding each solid component to a solvent and stirring, a coating solution for each layer can be created. 【0089】 The solvent disperses the solid components. Suitable solvents include, for example, methylene chloride, toluene, xylene, ethyl acetate, butyl acetate, and acetone. Alternatively, MEK (methyl ethyl ketone), MIBK (methyl isobutyl ketone), ethanol, methanol, and n-propyl alcohol can be used. 【0090】 Returning to Figure 10(b), the next step is to apply the coating solution to create a coated film (Step 202: Coating Process). The method of coating is not particularly limited, but it can be done using a die method or a microgravure method. Alternatively, a method can be used in which the coating solution is dropped, rotated, and centrifugal force is used to create a film of uniform thickness. The coating solution may also be applied while heated. In this process, the surface modifier in the low refractive index layer 17 segregates to the surface side of the coated film. 【0091】 Furthermore, the applied coating film is dried (Step 203: Drying process). Drying can be carried out by leaving it at room temperature to allow the solvent to evaporate, or by forcibly removing the solvent by heating or vacuuming. 【0092】 Then, light energy such as ultraviolet light or heat is irradiated to polymerize the binder component in the coating film. As a result, the binder component in the coating film hardens, forming the resin portion 161 and the binder 171 (Step 204: Polymerization step). Through the above steps, the anisotropic diffusion layer 16 and the low refractive index layer 17 can be formed. Note that the drying step and the polymerization step can be considered as a curing step that hardens the applied coating solution. 【0093】 <Explanation of the effects when an anisotropic diffusion layer 16 or lens sheet is provided> Figure 11 shows the effect of providing an anisotropic diffusion layer 16. Figure 11 shows the luminance distribution, which is the relationship between the angle relative to the front direction and the luminance. Here, the horizontal axis represents the angle relative to the front direction, and the vertical axis represents the luminance. The luminance shown is when the front luminance is normalized to 1.0. The solid line shows the case where the anisotropic diffusion layer 16 is provided. In other words, it shows an example of the brightness distribution of light emitted from the liquid crystal display device 1a when the anisotropic diffusion layer 16 is provided. The dotted line shows the case where the anisotropic diffusion layer 16 is not provided. In other words, it shows an example of the brightness distribution of light emitted from the liquid crystal display device 1a when the anisotropic diffusion layer 16 is not provided. 【0094】 We compare the case with the solid line, which has the anisotropic diffusion layer 16, with the case without the anisotropic diffusion layer 16, which has the dotted line. As a result, it can be seen that the brightness is higher with the anisotropic diffusion layer 16 in the region between 40° and 60° and in the region between -60° and -40°. Furthermore, the brightness is particularly high in the region between 50° and 60° and in the region between -60° and -50°. This indicates that the brightness is high even at angles other than the front direction, and that the viewing angle characteristics are improved. However, there is almost no difference between the two in the region between 20° and 40° and in the region between -40° and -20°. In other words, at these angles, the brightness is almost the same as before. Therefore, although the viewing angle characteristics are improved by providing the anisotropic diffusion layer 16, the improvement is insufficient in this region. 【0095】 Therefore, in this embodiment, in addition to the anisotropic diffusion layer 16, a lens sheet is provided on the backlight unit 11. The lens sheet is the first lens sheet 114 and the second lens sheet 115 described above. Furthermore, the difference in light-gathering properties of these two lens sheets, the thickness of the adhesive layer, etc. are utilized. This ensures that when an image is displayed, the light-gathering properties in the left-right direction and the up-down direction are different. This solves the problem. 【0096】 Figure 12 is a table showing the effects of providing the anisotropic diffusion layer 16 and the lens sheet. In the illustrated table, the items "Existing," "Anisotropic Diffusion Layer + Lens Sheet," "Lens Sheet Change," and "Anisotropic Diffusion Layer + Lens Sheet Change" are arranged horizontally. Furthermore, for "Anisotropic Diffusion Layer + Lens Sheet" and "Lens Sheet Change," the luminance distribution is divided into "Front Priority" and "Viewing Angle Priority." In other words, "Front Priority" refers to the case where a lens sheet configuration or anisotropic diffusion layer 16 that prioritizes front luminance is applied. Conversely, "Viewing Angle Priority" refers to the case where a lens sheet configuration or anisotropic diffusion layer 16 that prioritizes the viewing angle is applied. Then, in the illustrated table, the items "Configuration," "Front Characteristics," and "Viewing Angle Characteristics" are arranged vertically. 【0097】 Of these, "Configuration" refers to the layer configuration for each of the following: "Existing," "Anisotropic Diffusion Layer + Lens Sheet," "Lens Sheet Change," and "Anisotropic Diffusion Layer + Lens Sheet Change." In other words, the "existing" system uses two lens sheets: one that focuses light horizontally and another that focuses light vertically. Both of these lens sheets are prism sheets with similar light-gathering properties. In this case, the anisotropic diffusion layer 16 is not provided. Furthermore, the "anisotropic diffusion layer + lens sheet" configuration includes an anisotropic diffusion layer 16 in addition to the two lens sheets. Both lens sheets are prism sheets with similar light-gathering properties. The anisotropic diffusion layer 16 is a "low-diffusion" layer with low light diffusion when "front view priority" is selected, and a "high-diffusion" layer with high light diffusion is selected when "field of view priority" is selected. 【0098】 Furthermore, "lens sheet modification" involves changing the lens sheet compared to the "existing" configuration. That is, the light-gathering properties of the lens sheets differ in the vertical and horizontal directions. In this case, a prism sheet with higher light-gathering properties is used as the lens sheet that focuses light in the vertical direction. Conversely, a lenticular sheet with lower light-gathering properties is used as the lens sheet that focuses light in the horizontal direction. And the anisotropic diffusion layer 16 is not created. Furthermore, the "anisotropic diffusion layer + lens sheet change" case involves changing the lens sheet and adding an anisotropic diffusion layer 16. In other words, the lens sheet is changed compared to the "anisotropic diffusion layer + lens sheet" case. Specifically, a prism sheet with higher light-gathering properties is used as the lens sheet that focuses light in the vertical direction. Conversely, a lenticular sheet with lower light-gathering properties is used as the lens sheet that focuses light in the horizontal direction. 【0099】 "Front characteristics" refer to the characteristics of front luminance and front contrast (front CR). "Front luminance" is the luminance in the front direction, and "front contrast (front CR)" is the contrast in the front direction. Here, the "existing" case is standardized as 100 (Ref.), and the characteristics are described accordingly. Furthermore, "viewing angle characteristics" refer to the characteristics of 30° luminance, 60° luminance, full width at half maximum (FWHM) of the luminance distribution, and Δu'v' (color change). Of these, "30° luminance" is the luminance when viewed from an angle of 30° relative to the front direction. "60° luminance" is the luminance when viewed from an angle of 60° relative to the front direction. The characteristics of 30° luminance and 60° luminance are described by normalizing the front luminance to 100%. In this case, the smaller the value of 30° luminance and 60° luminance is from 100%, the smaller the luminance is compared to the front luminance. Furthermore, "full width at half maximum (FWHM)" is the full width at half maximum explained in Figure 6, and is the angle at which the luminance is half that of the front luminance. In this case, a larger FWHM is preferable. Finally, Δu'v' (color change) is the color change when viewed from the 60° direction relative to the front direction, and a lower value is better. 【0100】 These characteristics were measured using the following method. For measurement, an evaluation liquid crystal display device 1a satisfying the above conditions was created. A liquid crystal display panel having the upper configuration was placed on the backlight unit 11. This arrangement ensured that the polarization plane of the light emitted from the backlight unit 11 and the polarization plane of the polarizer placed on the incident surface side of the liquid crystal display panel were the same. Measurements were then performed using a Conocope manufactured by Autoronic-Melsius. At this time, the diffusion direction of the prepared sample was set to be in the direction of the display's lateral direction. The lateral luminance distribution (between -80° and +80°) of the liquid crystal display device 1a during black display (grayscale 0) and white display (grayscale 255) was measured. For 30° luminance and 60° luminance, the average value of the luminances at -30° and +30° or -60° and +60° was adopted. Furthermore, the full width at half maximum (FWHM) was calculated from the above luminance distribution. In addition, the ratio of luminance during white display to luminance during black display was defined as contrast. Chromaticity was calculated using the CIE 1876UCS color system (u'v'). The chromaticity change was defined as the distance (Δu'v') in the u'v' coordinate system between the frontal view and the 60° observation view when displaying white. In this case, the distance (Δu'v') can also be called the Euclidean distance in the u'v' color space. 【0101】 In Figure 12, in the case of the "existing" configuration, the frontal characteristics are good, but the 30° and 60° brightness are low. In other words, the viewing angle characteristics are insufficient. Also, the FWHM is small. Furthermore, Δu'v' (color change) is large. When the lens sheet is changed with the intention of improving the field of view characteristics, the 30° brightness improves, and as a result, the FWHM also increases. On the other hand, the improvement in 60° brightness is small, and furthermore, no improvement is seen in the color change (Δu´v´) when observed from an oblique direction. In other words, the field of view characteristics are insufficient. It is possible to improve the 60° brightness by further reducing the light-gathering ability of the first lens sheet 114, but the front brightness decreases significantly. 【0102】 In contrast, with the "anisotropic diffusion layer + lens sheet" configuration, the 30° brightness and 60° brightness increase compared to the "existing" configuration, showing improvement. Furthermore, FWHM increases compared to the "existing" configuration, also showing improvement. Additionally, with the "anisotropic diffusion layer + lens sheet" configuration, Δu'v' (color shift) also decreases. Therefore, the overall viewing angle characteristics improve, demonstrating an improvement effect. However, the improvement in 30° brightness and FWHM is small, resulting in insufficient viewing angle characteristics. Increasing the diffusion degree of the anisotropic diffusion layer 16 slightly improves 30° brightness and FWHM, but significantly reduces front brightness and contrast. Furthermore, in the case of "anisotropic diffusion layer + lens sheet change," the 30° and 60° brightness increases even further compared to "anisotropic diffusion layer + lens sheet," and is significantly improved compared to the "existing" configuration. Also, FWHM is larger and improved compared to "anisotropic diffusion layer + lens sheet." In addition, Δu'v' (color change) is small, similar to "anisotropic diffusion layer + lens sheet." Therefore, the overall viewing angle characteristics are greatly improved, resulting in a significant improvement effect. On the other hand, the decrease in front brightness and front contrast is also small, and sufficient front characteristics are ensured. 【0103】 Figure 13 shows the luminance distribution, which is the relationship between the angle relative to the front direction and the luminance. Here, the horizontal axis represents the angle relative to the front direction, and the vertical axis represents the luminance. The luminance shown is when the front luminance is normalized to 1.0. The luminance distribution is then illustrated for each of the following: "existing," "lens sheet modified," "anisotropic diffusion layer + lens sheet," and "anisotropic diffusion layer + lens sheet modified." This shows that the improvement in luminance distribution is greatest in the case of "anisotropic diffusion layer + lens sheet modified." Compared to the case in Figure 11, the luminance is higher and the luminance distribution is improved in the region between 20° and 40°. Furthermore, the luminance is higher and the luminance distribution is improved in the region between -40° and -20°. [Examples] 【0104】 The present invention will be described in more detail below with reference to examples. The present invention is not limited to these examples unless it exceeds the scope of its essence. First, we will explain how to create the liquid crystal display device 1a. Here, the liquid crystal display device 1a was created using the method shown below. 【0105】 [Backlight Unit 11] First, the backlight unit 11 was created as follows. An acrylic adhesive with a viscosity of 50 (mPa·s) was coated to the back surface (light incident side) of the reflective polarizing sheet 116 to the specified thickness. The reflective polarizing sheet 116 used was DBEF-D2-400 manufactured by Sumitomo 3M. Next, the prism edge of the second lens sheet 115 is brought into contact with the adhesive, and 300 mJ / cm² is applied. 2 The two sheets were fused together by irradiating them with ultraviolet light. 【0106】 Subsequently, the acrylic adhesive described above was applied to the back surface (the side without prisms) of the second lens sheet 115 to the specified thickness. At this time, the prism-forming surface of the first lens sheet 114 was brought into contact with the adhesive so that the respective prism edges were perpendicular to each other. In the case of a microlens array sheet, the direction of high light concentration was made perpendicular to each other. Then, 300 mJ / cm² was applied. 2 The adhesive was cured by irradiating it with ultraviolet light. This created a composite lens sheet for BLU consisting of a first lens sheet 114, a second lens sheet 115, and a reflective polarizing sheet 116. Furthermore, a diffuser plate 112 and a color conversion sheet 113 containing quantum dots were placed on the light sources 111 (blue LEDs) which were arranged at 1 cm intervals. Then, the composite lens sheet for the BLU was placed on top to form the backlight unit 11. 【0107】 The backlight unit 11 was constructed using the lens sheets shown in Table 1 below. Specifically, prism sheets 1-3, lenticular sheets 1-2, and microlens array sheets 1-2 were used. Note that in the table, prism sheets 1-3 may be referred to as P sheets 1-3, lenticular sheets 1-2 as LL sheets 1-2, and microlens array sheets 1-2 as MLA sheets 1-2. Then, using these lens sheets, we created backlight units 11 with configurations 1 to 17 as shown in Tables 2 to 3 below. In Tables 2-3, the difference in half-width (ΔFWHM) was measured as follows: First, a VA-type liquid crystal display panel with a TAC film on its outermost surface was prepared. This was then placed on the backlight unit 11 to constitute the liquid crystal display device 1a. The luminance distribution of the liquid crystal display device 1a in the left-right and up-down directions was measured using a ConoScope manufactured by Autoronic-Melsius. Furthermore, the half-width (FWHM) in the left-right and up-down directions was measured from the measured luminance distribution. The difference in half-width (FWHM) in the left-right and up-down directions was defined as the difference in half-width (ΔFWHM). Note that in the following tables, "μm" may be written as "um". 【0108】 [Table 1] 【0109】 [Table 2] 【0110】 [Table 3] 【0111】 [Connection between the backlight unit 11 and the liquid crystal display panel] Next, a VA-type liquid crystal display panel was prepared, in which the outermost surface is a TAC film. This liquid crystal display panel consists of a phase difference film 13a, a liquid crystal section 14, a phase difference film 13b, a polarizing film 12b, and a TAC film. In this case, the substrate 15, anisotropic diffusion layer 16, hard coat layer 18, and low refractive index layer 17 are not formed in the liquid crystal display device 1a shown in Figures 2 and 9(b). Then, the liquid crystal display panel was placed on the backlight unit 11. 【0112】 [Creation of liquid crystal display device 1a] Subsequently, an anisotropic diffusion layer 16, a hard coat layer 18, and a low refractive index layer 17 were formed to create a liquid crystal display device 1a. Five types of liquid crystal display devices, Panel 1 to Panel 5, were created. The anisotropic diffusion degree (ADV) of the anti-reflective film described below was measured using a GP-200 variable-angle photometer manufactured by Murakami Color Technology Laboratory Co., Ltd. The anti-reflective film was positioned so that the incident light was perpendicular to the evaluation surface, and the luminance distribution (between -50° and +50°) in the anisotropic diffusion direction and perpendicular direction of the transmitted light was measured. The ratio of the amount of transmitted light at 5° in the anisotropic diffusion direction to the amount of transmitted light at 5° perpendicular to the anisotropic diffusion direction was defined as the ADV (anisotropic scattering degree). 【0113】 (LCD display panel 1) Of these, the liquid crystal display panel 1 was created as follows. An acrylic oligomer having an acryloyl group was dissolved in a mixed solvent of methyl ethyl ketone and methyl isobutyl ketone. The refractive index of the acrylic oligomer is 1.51. Needle-shaped calcium carbonate particles were added to this mixture in 80 parts by mass per 100 parts by mass of acrylic oligomer. These needle-shaped calcium carbonate particles had an average major axis of 20 μm, an average minor axis of 0.6 mm, and a refractive index of 1.66 on the major axis and 1.50 on the minor axis. Furthermore, 4 parts by mass of a photopolymerization initiator was added. The photopolymerization initiator used was Irgacure 127 from IGM Resin. Subsequently, methyl ethyl ketone and dimethyl carbonate were added to adjust the solid content concentration to 65% by mass. This composition was applied to a TAC film (substrate 15) using a bar coater and dried at 80°C for 2 minutes. Then, an illuminance of 200 mW / cm² was applied. 2 The film was cured by irradiating it with a high-pressure mercury lamp for 3 seconds. A TAC film with a film thickness of 60 μm was used. This resulted in obtaining an anisotropic diffusion layer 16 on the TAC film (substrate 15). The anisotropic diffusion layer 16 had a film thickness of 10 μm. Furthermore, HC-1 and LR-1 were coated onto the anisotropic diffusion layer 16 using a bar coater. HC-1 is a coating solution for forming the hard coat layer 18. LR-1 is a coating solution for forming the low refractive index layer 17. The methods for preparing HC-1 and LR-1 will be described later. The hard coat layer 18 formed at this time had a thickness of 5 μm. The low refractive index layer 17 formed at this time had a thickness of 98 nm. Thus, an anti-reflective film with an anisotropic diffusion layer 16 was fabricated. When the anisotropic diffusion of the anti-reflective film was measured, the anisotropic diffusion (ADV) was measured to be 30. Then, this anti-reflective film was laminated onto the TAC film of the liquid crystal display panel using a 5μm thick acrylic transparent adhesive film. 【0114】 (Liquid crystal display panel 2) The liquid crystal display panel 2 was created as follows. Polymethyl methacrylate resin was dissolved in a mixed solvent of methyl ethyl ketone and methyl isobutyl ketone. The refractive index of the polymethyl methacrylate resin is 1.50. Polystyrene particles were added to this mixture at a ratio of 30 parts by mass per 100 parts by mass of resin. These polystyrene particles have an average particle size of 5 μm and a refractive index of 1.60. Subsequently, methyl ethyl ketone was added to adjust the solid content concentration to 50% by mass. This composition was coated onto a release-treated PET film using a bar coater and dried at 80°C for 2 minutes. Then, it was peeled off from the release-treated PET film to obtain an anisotropic diffusion layer 16 with a thickness of 300 μm before stretching. This anisotropic diffusion layer 16 was stretched in an atmosphere near the glass transition temperature of polystyrene (90 to 150°C) to obtain an anisotropic diffusion layer 16. HC-1 and LR-1 were coated onto the anisotropic diffusion layer 16 using a bar coater. The resulting hard coat layer 18 had a thickness of 10 μm. The low refractive index layer 17 formed at the same time had a thickness of 98 nm. The degree of anisotropic diffusion (ADV) of this anti-reflective film was measured to be 5. Then, this anti-reflective film was laminated onto the TAC film of the liquid crystal display panel using a 5 μm thick acrylic transparent adhesive film. In this case, the TAC film of the liquid crystal display panel becomes the base material 15. 【0115】 (Liquid crystal display Panel 3) The liquid crystal display panel 3 was created as follows. A 60nm thick TAC film was coated with HC-1 using a bar coater and dried at 80°C for 1 minute. Afterward, it was exposed to an illuminance of 100mW / cm². 2 The material was cured by irradiating it with a high-pressure mercury lamp for 2 seconds. As a result, a hard coat layer 18 with a thickness of 5 μm was formed. Furthermore, LR-1 was applied to the hard coat layer 18 and dried at 60°C for 2 minutes. After that, curing was carried out under the same conditions as for the hard coat layer 18. As a result, a low refractive index layer 17 with a thickness of 98 nm was formed, and an anti-reflective film was obtained. Furthermore, an acrylic adhesive polymer was prepared by copolymerizing butyl acrylate and acrylic acid. This acrylic adhesive polymer had a weight-average molecular weight of 100,000 and a refractive index of 1.51. The acrylic adhesive polymer was then dissolved in a mixed solvent of methyl ethyl ketone and methyl isobutyl ketone. Needle-shaped calcium carbonate particles were added to this mixture in 60 parts by mass per 100 parts by mass of acrylic oligomer. These needle-shaped calcium carbonate particles had an average major axis of 20 μm, an average minor axis of 0.6 mm, and a refractive index of 1.66 on the major axis and 1.50 on the minor axis. Then, 0.5 parts by mass of an isocyanate-based curing agent was added. Subsequently, methyl ethyl ketone and dimethyl carbonate were added to adjust the solid content concentration to 65% by mass. This composition was applied to the back surface of the anti-reflective film (the side without the low refractive index layer 17) using a bar coater. Then, by drying at 100°C for 3 minutes, an anisotropically diffusive adhesive layer with a thickness of 15 μm was formed on the back surface of the anti-reflective film. The degree of anisotropic diffusion (ADV) of the anti-reflective film with the adhesive layer was measured to be 35. Subsequently, the anti-reflective film was bonded onto the TAC film of the liquid crystal display panel via an adhesive layer. In this case, the TAC film of the liquid crystal display panel becomes the base material 15. 【0116】 (LCD display panel 4) The liquid crystal display panel 4 was created as follows. A 60nm thick TAC film was coated with HC-1 using a bar coater and dried at 80°C for 1 minute. Afterward, it was exposed to an illuminance of 100mW / cm². 2 The material was cured by irradiating it with a high-pressure mercury lamp for 2 seconds. As a result, a hard coat layer 18 with a thickness of 5 μm was formed. Furthermore, LR-1 was applied to the hard coat layer 18 and dried at 60°C for 2 minutes. Afterward, curing was performed under the same conditions as for the hard coat layer 18. As a result, a low refractive index layer 17 with a thickness of 98 nm was formed, and an anti-reflective film without an anisotropic diffusion layer 16 was fabricated. The degree of anisotropic diffusion (ADV) of the anti-reflective film was measured to be 0.1. The above anti-reflective film was laminated onto the TAC film of the liquid crystal display panel using a 5μm thick acrylic transparent adhesive film. 【0117】 (Liquid crystal display panel 5) The liquid crystal display panel 5 was created as follows. An acrylic oligomer having an acryloyl group was dissolved in a mixed solvent of methyl ethyl ketone and methyl isobutyl ketone. The refractive index of the acrylic oligomer was 1.51. Needle-shaped calcium carbonate particles were added to this mixture at a ratio of 200 parts by mass per 100 parts by mass of acrylic oligomer. These needle-shaped calcium carbonate particles had an average major axis of 20 μm, an average minor axis of 0.6 mm, and a refractive index of 1.66 on the major axis and 1.50 on the minor axis. Furthermore, 4 parts by mass of a photopolymerization initiator was added. The photopolymerization initiator used was Irgacure 127 from IGM Resin. Subsequently, methyl ethyl ketone and dimethyl carbonate were added to adjust the solid content concentration to 65% by mass. This composition was applied to a TAC film (substrate 15) using a bar coater and dried at 80°C for 2 minutes. Then, an illuminance of 200 mW / cm² was applied. 2 The film was cured by irradiating it with a high-pressure mercury lamp for 3 seconds. A TAC film with a film thickness of 60 μm was used. This resulted in obtaining an anisotropic diffusion layer on the TAC film (substrate 15). The anisotropic diffusion layer 16 had a film thickness of 10 μm. Furthermore, HC-1 and LR-1 were coated onto the anisotropic diffusion layer 16 using a bar coater. The resulting hard coat layer 18 had a thickness of 5 μm. The low refractive index layer 17 formed at this time had a thickness of 98 nm. Thus, an anti-reflective film with the anisotropic diffusion layer 16 was fabricated. The degree of anisotropic diffusion (ADV) of the anti-reflective film was measured to be 89. Then, this anti-reflective film was laminated onto the TAC film of the liquid crystal display panel using a 5μm thick acrylic transparent adhesive film. 【0118】 [Creation of HC-1] The composition of the coating solution HC-1 is shown in Table 4 below. The coating solution HC-1 contains monomers and / or oligomers as binder components. The coating solution HC-1 also contains a photopolymerization initiator, a defoamer, and a solvent. The binder component used was UA-306T manufactured by Kyoeisha Chemical Co., Ltd. Further binder components used included Viscoat #300 manufactured by Osaka Organic Chemical Industry Co., Ltd. and KAYARAD PET-30 manufactured by Nippon Kayaku Co., Ltd. Furthermore, the photopolymerization initiator used was IRGACURE184 manufactured by BASF Japan Ltd. Additionally, NR-121X-9IPA manufactured by Colcoat Co., Ltd. was used as the defoamer. Finally, BYK-066N manufactured by ALTANA was used as the defoamer. These are the solid components, and their mixing ratios are shown in Table 4. These solids were then added to a solvent and stirred to a concentration of 50% by mass. The solvents used were propylene glycol monomethyl ether and ethyl acetate. 【0119】 [Table 4] 【0120】 [Creating LR-1] The composition of the coating solution LR-1 is shown in Table 5 below. The coating solution LR-1 contains a binder component consisting of monomers and / or oligomers, and hollow silica particles 172. The coating solution LR-1 also contains a photopolymerization initiator, an oil-repellent surface modifier 173, and an oil-lipophilic surface modifier 173. Furthermore, the coating solution contains an antifoaming agent and a solvent. The binder component used was Optool AR-100 manufactured by Daikin Industries, Ltd. Additionally, KAYARAD PET-30 manufactured by Nippon Kayaku Co., Ltd. was used as another binder component. The hollow silica particles 172 had an average primary particle diameter of 75 nm. In addition to the hollow silica particles 172, solid silica particles with an average primary particle diameter of 10 nm were also used. Solid silica particles are silica particles that are solid inside, not hollow. Furthermore, the photopolymerization initiator used was IRGACURE 184 manufactured by BASF Japan Ltd. Finally, KY-1203 manufactured by Shin-Etsu Chemical Co., Ltd. was used as the oil-repellent surface modifier 173. Furthermore, Megafac RS-58 manufactured by DIC Corporation was used as the lipophilic surface modifier 173. In addition, Futergent 650A manufactured by Neos Corporation was used as the lipophilic surface modifier 173. And as the defoaming agent, BYK-066N manufactured by ALTANA was used. These are solid components, and their mass mixing ratios are shown in Table 5. 【0121】 These solids were then added to a mixture of methyl isobutyl ketone and n-butyl alcohol, which were used as solvents, and stirred. The solid content was adjusted to 5% by mass. This prepared the coating solution LR-1 for the low refractive index layer 17. The mass mixing ratios of the solvents are shown in Table 5. 【0122】 [Table 5] 【0123】 Next, examples and comparative examples will be described. [Examples, Comparative Examples] (Examples 1-18, Comparative Examples 1-15) Examples 1-18 and Comparative Examples 1-15 used one of the configurations 1-17 shown in Table 2 as the lens sheet, as shown in Tables 6-11. Furthermore, Examples 1-18 and Comparative Examples 1-15 used one of the liquid crystal display panels 1-5, as shown in Tables 6-11. 【0124】 [Table 6] 【0125】 [Table 7] 【0126】 [Table 8] 【0127】 [Table 9] 【0128】 [Table 10] 【0129】 [Table 11] 【0130】 Then, we measured the front luminance, front contrast (front CR), 30° luminance, 60° luminance, FWHM, and Δu'v' (color change). The measurement method was the same as that described in Figure 12. The evaluation at this time was based on a four-level scale from A to D, as follows: 【0131】 (Front brightness) 900 cd / m² 2 A 800 cd / m² 2 More than 900cd / m 2 Less than B 700 cd / m² 2 More than 800cd / m 2 Less than C 700 cd / m² 2 Less than D 【0132】 (Front contrast (Front CR)) 3500 or more A 2800 or more, less than 3500 B 2000 or more, less than 2800 C Less than 2000 D 【0133】 (30° brightness) 70% or more A 65% to less than 70% B 55% or more but less than 65% C Less than 55% D 【0134】 (60° brightness) 30% or more A 25% or more but less than 30% B 20% or more but less than 25% C Less than 20% D 【0135】 (FWHM) 84° or higher A 78° or more and less than 84° B 70° to less than 78° C Less than 70° D 【0136】 (Δu´v´(color change)) Less than 0.012% A 0.012% or more and less than 0.015% B 0.015% or more and less than 0.020% C 0.020% or more D 【0137】 [Evaluation Results] The evaluation results are shown in Tables 6 to 11. 【0138】 Examples 1 to 18 show cases where an anisotropic diffusion layer 16 is provided. Furthermore, they show cases where a first lens sheet 114 and a second lens sheet 115 are used. In addition, the second lens sheet 115 has higher light-gathering properties than the first lens sheet 114. This can also be said to be a case where the light-gathering properties of the liquid crystal display device 1a in the vertical direction are higher than the light-gathering properties in the horizontal direction. In Tables 6 to 11, "○" indicates the case where the anisotropic diffusion layer 16, the first lens sheet 114, and the second lens sheet 115 are provided. Conversely, "×" indicates the case where the anisotropic diffusion layer 16, the first lens sheet 114, and the second lens sheet 115 are not provided. Furthermore, "○" indicates the case where the light focusing ability in the vertical direction is higher than that in the horizontal direction. Conversely, "×" indicates the case where the light focusing ability in the vertical direction and the light focusing ability in the horizontal direction are the same. In this case, the front brightness, front contrast (front CR), 30° brightness, 60° brightness, FWHM, and Δu'v' (color change) all received an A or B rating. In other words, all evaluation items were very good. 【0139】 Comparative Examples 1 to 6 show cases where the anisotropic diffusion layer 16 is not provided, and cases where the first lens sheet 114 and the second lens sheet 115 are provided. However, the same lens sheet is used for both the first lens sheet 114 and the second lens sheet 115. That is, the light-gathering properties of the first lens sheet 114 and the second lens sheet 115 are the same. This can also be said to be the case where the light-gathering properties of the liquid crystal display device 1a are the same in the left-right direction and the up-down direction. In this case, the front brightness and front contrast (front CR) were good. On the other hand, the 30° brightness, 60° brightness, FWHM, and Δu'v' (color change) were all D, indicating poor performance. 【0140】 Comparative Examples 7 and 8 show cases where the anisotropic diffusion layer 16 is not provided, and cases where the first lens sheet 114 and the second lens sheet 115 are provided. Furthermore, the second lens sheet 115 has higher light-gathering properties than the first lens sheet 114. In this case, the front brightness and front contrast (front CR) were good. On the other hand, the 30° brightness, 60° brightness, FWHM, and Δu'v' (color change) were mostly C or D, indicating poor performance. 【0141】 Comparative Examples 9 to 14 are cases where an anisotropic diffusion layer 16 is provided, and where a first lens sheet 114 and a second lens sheet 115 are provided. However, the same lens sheet is used for both the first lens sheet 114 and the second lens sheet 115. That is, the light-gathering properties of the first lens sheet 114 and the second lens sheet 115 are the same. In this case, Δu'v' (color change) was good. On the other hand, at least one D was found in front brightness, front contrast, 30° brightness, and FWHM, indicating poor performance. Comparative Example 15 is a case where neither the anisotropic diffusion layer 16 nor the lens sheet is provided. In this case, the front brightness and Δu'v' (color change) are D, which is unsatisfactory. 【0142】 According to the configuration described above, the viewing angle characteristics are partially improved by providing the anisotropic diffusion layer 16. Specifically, the brightness is increased in the regions between 40° and 70° and between -70° and -40° relative to the front direction. In addition, the anisotropic diffusion layer 16 reduces Δu'v' (color change). Furthermore, by providing the first lens sheet 114 and the second lens sheet 115, the viewing angle characteristics, which were difficult to improve with the anisotropic diffusion layer 16, are improved. In other words, the brightness is increased in the regions between 20° and 40° and between -40° and -20° relative to the front direction. That is, the regions that were difficult to improve with the anisotropic diffusion layer 16 are complemented by the first lens sheet 114 and the second lens sheet 115. Specifically, the first lens sheet 114 and the second lens sheet 115 are provided, and the second lens sheet 115 has higher light-gathering properties than the first lens sheet 114. It can be said that this effect is a remarkable effect that goes beyond simply combining these factors. As a result, in this embodiment, the viewing angle characteristics in diagonal directions other than the front are further improved compared to conventional displays. This can also be said to mean that this embodiment achieves both good viewing angle characteristics in the front and diagonal directions other than the front. Furthermore, in this embodiment, the front brightness and contrast in the front direction (front contrast) are also good, and the image quality characteristics in the front direction are also good. Moreover, it can be said that the display device 1 equipped with the liquid crystal display device 1a of this embodiment has better image quality than conventional displays. Furthermore, this embodiment is particularly effective when applied to a liquid crystal display device using a VA-type liquid crystal panel. It is also particularly effective when applied to a backlight unit 11 using a color conversion sheet 113. Moreover, this complementary effect is particularly pronounced and effective when the anisotropic diffusion layer 16 comprises a resin portion 161 and anisotropic particles 162. 【0143】 In the example described above, the light-gathering properties in the vertical direction were set higher than those in the horizontal direction. However, it is also possible to reverse this, making the light-gathering properties in the horizontal direction higher than those in the vertical direction. Furthermore, some display devices 1 have a pivot (screen rotation) function. The pivot function allows the screen of the display device 1 to be rotated by 90°. In this case, for example, the longer side of the liquid crystal display device 1a is defined as the left-right direction, and the shorter side as the up-down direction. The light-gathering ability in the up-down direction is then made higher than that in the left-right direction. When the display device 1 is rotated, the left-right and up-down directions are reversed. As a result, the light-gathering ability in the left-right direction becomes higher than that in the up-down direction. In other words, depending on how the display device 1 is used, there are cases where the light-gathering ability in the up-down direction is higher than that in the left-right direction, and cases where these relationships are reversed. [Explanation of symbols] 【0144】 1…Display device, 1a…Liquid crystal display device, 11…Backlight unit, 12, 12a, 12b…Polarizing film, 13, 13a, 13b…Phase difference film, 14…Liquid crystal part, 15…Substrate, 16…Anisotropic diffusion layer, 17…Low refractive index layer, 18…Hard coat layer, 19…High refractive index layer, 111…Light source, 112…Diffuser plate, 113…Color conversion sheet, 114…First lens sheet, 115…Second lens sheet, 116…Reflective polarizing sheet, 117…First adhesive layer, 118…Second adhesive layer, 161…Resin part, 162…Anisotropic particles

Claims

[Claim 1] A light source that emits light, The light emitted from the aforementioned light source is concentrated in a direction toward the front of the device such that, when an image is displayed, the light concentration in the left-right direction differs from the light concentration in the up-down direction. A liquid crystal unit controls the transmission state of light focused by the light-gathering unit using liquid crystals, An anisotropic diffusion layer that anisotropically diffuses the light transmitted through the liquid crystal portion, Equipped with, The anisotropic diffusion layer is It comprises anisotropic particles having an anisotropic shape and arranged along one direction in the long axis direction, and a resin portion made of resin in which the anisotropic particles are dispersed, A liquid crystal display device in which, when the refractive index of the anisotropic particle in the direction of the long axis is n ax and the refractive index of the anisotropic particle in the direction of the short axis is n ay, at least one of the following relationships (I) and (II) holds true. (I) |n b -n ax| < 0.04 and 0.04 < |n b -n ay| < 0.50 (II) |n b -n ay| < 0.04 and 0.04 < |n b -n ax| < 0.50 [Claim 2] The liquid crystal display device according to claim 1, wherein the light-collecting unit has low light-collecting ability in the direction in which the viewing angle is to be further expanded, among the left-right direction and the up-down direction. [Claim 3] The liquid crystal display device according to claim 2, wherein the direction in which the viewing angle is to be further expanded is the left-right direction. [Claim 4] The liquid crystal display device according to claim 2, wherein the light-gathering section comprises two lens sheets in which a plurality of lenses are arranged in a planar manner, a first lens sheet and a second lens sheet having higher light-gathering properties than the first lens sheet, and the difference in light-gathering properties between the first lens sheet and the second lens sheet reduces the light-gathering properties in the direction in which the viewing angle is to be further expanded, among the left-right direction and the up-down direction. [Claim 5] The liquid crystal display device according to claim 4, wherein the first lens sheet and the second lens sheet are selected from a prism sheet, a lenticular sheet, and a microlens array sheet. [Claim 6] The liquid crystal display device according to claim 1, wherein the direction with low light-gathering ability among the left-right direction and the up-down direction is the direction in which the anisotropic diffusion layer anisotropically diffuses light. [Claim 7] The invention further comprises at least one of a first adhesive layer located on the light-emitting side of the first lens sheet and a second adhesive layer located on the light-emitting side of the second lens sheet, The liquid crystal display device according to claim 4, wherein when the first adhesive layer is provided, the light-gathering properties of the first lens sheet are controlled by the first adhesive layer, and when the second adhesive layer is provided, the light-gathering properties of the second lens sheet are controlled by the second adhesive layer. [Claim 8] The liquid crystal display device according to claim 7, wherein the thickness of the first adhesive layer is greater than the thickness of the second adhesive layer. [Claim 9] The liquid crystal display device according to claim 8, wherein the thickness of the first adhesive layer is 1.5 times or more the thickness of the second adhesive layer. [Claim 10] The first lens sheet and the second lens sheet are of the same type. The liquid crystal display device according to claim 7, wherein when the first adhesive layer is provided, the light-gathering properties of the first lens sheet are controlled by the thickness of the first adhesive layer, and when the second adhesive layer is provided, the light-gathering properties of the second lens sheet are controlled by the thickness of the second adhesive layer. [Claim 11] The first lens sheet and the second lens sheet are both prism sheets. The liquid crystal display device according to claim 10, wherein the thickness of the first adhesive layer is 10 μm or more and the thickness of the second adhesive layer is less than 10 μm. [Claim 12] The liquid crystal display device according to claim 7, wherein both the first lens sheet and the second lens sheet are prism sheets, the apex angle of the first lens sheet is less than 83° or greater than 97°, and the apex angle of the second lens sheet is 83° or more and 97° or less. [Claim 13] The liquid crystal display device according to claim 1, wherein the half-width of the luminance distribution, which is an index representing the light-gathering ability of the light-gathering part and is the relationship between the angle with respect to the front direction and the luminance, is 7° or more greater in the direction in which the viewing angle is to be further expanded, among the left-right direction and the up-down direction. [Claim 14] The liquid crystal display device according to claim 1, wherein the anisotropic diffusion layer has a reflectance of 1.0% or less, excluding the specular reflection component. [Claim 15] The liquid crystal display device according to claim 1, wherein the anisotropic particles have a length in the long axis direction of 1 μm or more and a length in the short axis direction of 0.1 μm or more and a length in the short axis direction of 10 μm or less. [Claim 16] The liquid crystal display device according to claim 15, wherein the aspect ratio, which is the ratio of the length in the long axis direction to the length in the short axis direction of the anisotropic particle, is 10 or more. [Claim 17] The liquid crystal display device according to claim 1, wherein the interface between the anisotropic particles and the resin portion is compatible. [Claim 18] The liquid crystal display device according to claim 1, wherein the refractive index of the resin portion is 1.45 or more and 1.65 or less. [Claim 19] The liquid crystal display device according to claim 1, wherein the anisotropic particles include at least one of a metal oxide, a carbonate compound, a hydroxide compound, and a phosphate compound. [Claim 20] 1. Further comprising a low refractive index layer having a refractive index of 1.40 or less, The liquid crystal display device according to claim 1, wherein the difference in refractive index between the resin portion and the low refractive index layer is 0.1 or more. [Claim 21] The liquid crystal display device according to claim 1, wherein the anisotropic diffusion layer has a haze value of 20% or more and 80% or less. [Claim 22] The liquid crystal display device according to claim 1, wherein the anisotropic diffusion layer has an anisotropic diffusion degree of 3 or more. [Claim 23] The liquid crystal display device according to claim 1, further comprising a high refractive index layer having a refractive index of 1.60 or higher. [Claim 24] The liquid crystal display device according to claim 1, further comprising a hard coat layer having a refractive index of 1.54 or higher. [Claim 25] 1. Further comprising a low refractive index layer having a refractive index of 1.40 or less and a substrate supporting the anisotropic diffusion layer, The liquid crystal display device according to claim 1, wherein the substrate is provided between the low refractive index layer and the anisotropic diffusion layer. [Claim 26] 1. Further comprising a low refractive index layer having a refractive index of 1.40 or less, The liquid crystal display device according to claim 1, wherein the anisotropic diffusion layer functions as a substrate supporting the low refractive index layer. [Claim 27] A display device comprising a liquid crystal display device according to any one of claims 1 to 26.

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