Display device, monitor display device, and film body

Abstract

This display device has a layered structure in which a shape having protrusions and recesses including a distribution of heights equal to or less than the wavelength of visible light is formed on the surface of a display panel. The shape having protrusions and recesses is a shape in which, when the apex of the projection protruding furthest to the surface side is defined as the zero-height position in the panel depth direction, the height value for which the cumulative frequency of the height values at each position in the surface direction of the shape having protrusions and recesses is 10% is within the range of -40 nm to -110 nm and the height value for which the cumulative frequency is 90% is within the range of -100 nm to -250 nm.

Description

Display device, monitor display device, film body

[0001] The present technology relates to a display device, and particularly to a structure on a surface of a display panel.

[0002] In the field of display devices, there are technologies for suppressing reflection caused by external light on a panel surface. For example, Patent Document 1 below discloses an antireflection film having an antireflection layer provided with a fine uneven pattern.

[0003] Japanese Patent Laying-Open No. 2012-252224

[0004] Incidentally, it is desirable that the surface of a display panel has not only a reflection reduction function but also good scratch resistance. Display panels are often wiped with a cloth or the like to remove dirt and cloudiness in order to maintain the transparency of the display surface. Therefore, it is desired to make the surface of the display panel less likely to be scratched during cleaning. On the other hand, forming a fine uneven pattern on the surface of the display panel for a low reflection function may reduce scratch resistance.

[0005] Therefore, the present disclosure proposes a panel structure that improves scratch resistance while maintaining the low reflection characteristics of a display panel.

[0006] The display device according to the present technology has a layer structure in which concavo-convex shapes distributed with heights equal to or less than a visible light wavelength are formed on a surface of a display panel, wherein when the apex of the most protruding convex portion on the surface side is set as a zero height position in the depth direction of the panel, the height value at which the cumulative frequency of height values at each position in the plane direction of the concavo-convex shape reaches 10% is within a range from -40 nm to -110 nm, and the height value at which the cumulative frequency reaches 90% is within a range from -100 nm to -250 nm. This is a display device having a so-called moth-eye shape formed on the surface for obtaining a low reflection function. The concavo-convex shape as a moth-eye structure is defined based on the cumulative frequency of heights. Note that the cumulative frequency of height is the ratio of cumulative frequency to the total number of height measurement points. Therefore, for example, the height value at which the cumulative frequency reaches 10% refers to the height value of the sample when the cumulative frequency corresponds to 10% of the total number of measurement points.

[0007] This is an explanatory diagram of the layer structure of a display device according to an embodiment of this technology. This is an explanatory diagram of another layer structure of the display device according to the embodiment. This is an explanatory diagram of the height of the moth-eye structure according to the embodiment. This is an explanatory diagram of the height distribution of the comparative example and the embodiment. This is an explanatory diagram of the conditions based on cumulative frequency according to the embodiment. This is an explanatory diagram of the uneven shape in the moth-eye structure. This is an explanatory diagram of the vertex shape of the convexity in the moth-eye structure. This is an explanatory diagram of the scratch resistance to the uneven structure in the moth-eye structure. This is an explanatory diagram of other conditions based on cumulative frequency according to the embodiment. This is an explanatory diagram of the range of a cumulative frequency of 5% according to the embodiment. This is an explanatory diagram of the slope of the cumulative frequency according to the embodiment. This is an explanatory diagram of the panel structure of an LCD (Liquid Crystal Display). This is an explanatory diagram of the layer structure of an embodiment applied to an LCD. This is an explanatory diagram of the layer structure of an embodiment applied to an LCD. This is an explanatory diagram of the panel structure of a QD-OLED (Quantum Dot-Organic Light Emitting Diode) display or LED (Light Emitting Diode) display without a circular polarizer. This is an explanatory diagram of the layer structure of an embodiment applied to a QD-OLED display or LED display without a circular polarizer. This is an explanatory diagram of the layer structure of an embodiment applied to a QD-OLED display or LED display without a circular polarizer. This is an explanatory diagram of the panel structure of a W-OLED (White-Organic Light Emitting Diode) display or LED display with a circular polarizer. This is an explanatory diagram of the layer structure of an embodiment applied to a W-OLED display or LED display with a circular polarizer. This is an explanatory diagram of the layer structure of an embodiment applied to a W-OLED display or LED display with a circular polarizer. This is a block diagram of the configuration of the monitor display device of the embodiment.

[0008] The embodiments will be described below in the following order: <1. Panel structure of the embodiment> <2. Application to various display devices> <3. Monitor display device> <4. Summary and modified examples>

[0009] <1. Panel Structure of the Embodiment> The display device of the embodiment can be realized as various display devices such as LCD, QD-OLED display, W-OLED display, and LED display. It provides a layer structure for the panel surface that can achieve both low reflectivity and scratch resistance.

[0010] Figure 1 shows a specific example of the panel surface structure of the display device according to the embodiment. In this case, it shows the display panel 1 and the layer structure 10 formed on the surface of the display panel 1.

[0011] The display panel 1 refers to a structural part of a display device such as the LCD described above, and the layer structure 10 refers to a part formed on the surface of the display panel 1 by film application or coating. In the example shown in the figure, the layer structure 10 has an anti-glare structure 7 which has a curved surface formed by macroscopic irregularities at the air interface to exhibit an anti-glare function, and a moth-eye structure 8 which has a microscopic irregular shape formed on the curved surface to exhibit a low-reflection function.

[0012] The layer structure 10 in this example has a diffusion adhesive layer 4, a base material 5, and a shaping layer 6. The shaping layer 6 is formed on the base material 5, which is made of TAC (Triacetylcellulose), using a UV (ultraviolet) curing resin. The shaping layer 6 has an anti-glare structure 7 as macroscopic irregularities as shown by the dashed lines, and also has a moth-eye structure 8. This results in an anti-glare-moth-eye film.

[0013] This anti-glare moth-eye film, consisting of the base material 5 and the shaping layer 6, is attached to the surface of the display panel 1 using a diffusion adhesive layer 4. The diffusion adhesive layer 4 is, for example, an OCA (Optically Clear Adhesive) filled with a diffusion filler.

[0014] Figure 2 shows another example of the layer structure 10. The layer structure 10 in Figure 2 is the same as in Figure 1 in that it has a diffusion adhesive layer 4, a base material 5, and a shaping layer 6, but it is an example that does not have the curvature of the anti-glare structure 7. The bottom surface of the moth-eye structure 8 is not curved.

[0015] Figures 1 and 2 above illustrate the panel surface structure of a display device, and we will focus on the moth-eye structure 8 in these. The moth-eye structure 8 is formed by a fine uneven shape distributed with heights below the wavelength of visible light. Such a moth-eye structure 8 is used on the panel surface as a low-reflectivity structure, for example, with a reflectivity of 0.8% or less. In this embodiment, the desirable low-reflectivity characteristic is a Specular Component Include (SCI) of 0.8% or less with a D65 light source. In particular, this reflectivity refers to the reflectivity at the air interface on the outermost surface of the display device.

[0016] Figure 3 schematically shows a cross-section of the fine irregularities of the moth-eye structure 8. The top of the figure is the air interface side of the display panel surface, that is, the direction from which the viewer is located. The bottom of the figure is the display panel 1 side as seen from the moth-eye structure 8 in Figure 1, that is, the back side of the display device. The top and bottom represent the depth direction. Hereafter, the air interface side will be referred to as the "surface side," and the back side of the display device will be referred to as the "opposite surface side."

[0017] The dashed line represents a horizontal line passing through the vertex of the most prominent protrusion on the surface side in the uneven shape of the moth-eye structure 8. This horizontal plane represented by the dashed line is considered to be the reference plane LV that serves as the reference for height in the depth direction, that is, the line where the height value = 0. In this disclosure, the "height" at each position in the surface direction in the uneven shape of the moth-eye structure 8 is the distance indicated by the dashed arrow pointing from this reference plane LV toward the opposite surface side.

[0018] In this embodiment, an appropriate uneven shape is found by the distribution of "height" values ​​at each position of the moth-eye structure 8. In Figure 3, the "height" is shown as being measured at positions at a constant pitch from the reference surface LV, for example, at positions that become grid points when grid lines are drawn at a constant pitch on the surface of the reference surface LV. On the other hand, the "height" may be measured at each vertex of the convex part that protrudes on the surface side, even if the pitch is not necessarily constant. It is preferable to measure at a measurement interval and pitch that is sufficiently small compared to the width of the moth-eye structure 8.

[0019] Figure 4 shows the distribution of height values ​​for nine types of layered structures, samples SP1 to SP9, each having a moth-eye structure 8 on its surface. The horizontal axis is in units of [nm], and the height from the reference plane LV to the opposite surface is shown as a negative value. Depending on the sample, the height values ​​of the uneven surface range from 0 nm to around -500 nm, but are mainly distributed at heights below the lower limit of the visible light wavelength, for example, around 400 nm. The vertical axis represents frequency.

[0020] Samples SP1 to SP9 are, for example, film samples representing the layered structure 10 shown in Figures 1 and 2. Samples SP3 and SP4, shown by thick lines, are equipped with a moth-eye structure 8 with an uneven shape as part of this embodiment, while the other samples SP1, SP2, SP5 to SP9 are comparative examples. For each sample, the height was measured at positions set at predetermined pitches in a grid pattern within a planar area of, for example, 3 μm square. Specifically, AFM (Atomic Force Microscope) measurements were performed at 256 × 256 measurement points within a 3 μm × 3 μm area. Converted to a pitch, this is 3000 nm / 256 = 11.7 nm pitch. The cantilever is an Olympus Corporation model OMCL-AC160TS-R3 (R = 7 nm).

[0021] The histograms shown tended to exhibit better low reflectivity but weaker scratch resistance when they were close to a Gaussian distribution and had a wide height range. On the other hand, histograms that did not resemble a Gaussian distribution tended to exhibit good scratch resistance but poor reflectivity. It is presumed that a distribution close to a Gaussian distribution is more likely to yield low reflectivity and high scratch resistance because there are no steep shape changes. Of the samples SP1 to SP9 shown in the figure, samples SP3 and SP4 exhibited desirable low reflectivity and scratch resistance. Therefore, the moth-eye structure 8, which has a height distribution corresponding to samples SP3 and SP4, is defined based on the cumulative frequency.

[0022] Figure 5 shows the cumulative frequency and height values ​​for samples SP1 to SP9, with the horizontal axis representing the cumulative frequency and the vertical axis representing the height value (nm). A value of "1" on the horizontal axis represents 100%. The cumulative frequency of the height value is the proportion of the cumulative frequency to the total number of height measurement points. For example, the height value at which the cumulative frequency is 10% is the height value at which the cumulative frequency reaches 10% of the total number of points.

[0023] Here, it is specified that the height value at a cumulative frequency of 10% is within the range of -40 nm to -110 nm, and the height value at a cumulative frequency of 90% is within the range of -100 nm to -250 nm. In Figure 5, the area enclosed by a dashed line and shaded is the range that satisfies this condition. Samples SP3 and SP4 satisfy this condition. The samples of the other comparative examples do not satisfy this condition.

[0024] For example, samples where the height value at a cumulative frequency of 10%, indicated by arrow R1, falls within the range of 0 nm to -39 nm, exhibited good scratch resistance but insufficient low-reflectivity properties. These samples had a relatively large number of points with heights close to the reference plane LV, resulting in a tendency for rapid changes in refraction. Similarly, samples where the height value at a cumulative frequency of 10%, indicated by arrow R2, exceeds -110 nm, exhibited good low-reflectivity properties but insufficient scratch resistance. This is thought to be because there were relatively few convex areas on the surface side close to the reference plane LV, resulting in a smoother change in refraction, while the reduced number of supporting points on the surface side led to decreased scratch resistance.

[0025] This shows the general trend. Figure 6 shows the degree of uniformity of the uneven shape as a moth eye. The left figure schematically shows an example where the heights are relatively uniform, and the right figure shows an example where the heights are not uniform. For example, samples SP5, SP7, and SP8, which fall within the range indicated by arrow R1, tend to be samples with uniform heights, as shown in the left figure. On the other hand, samples SP1, SP2, and SP9, which fall within the range indicated by arrow R2, tend to be samples with large variations in height, as shown in the right figure.

[0026] Figure 7 also shows the vertex shape of the convex part, with the left figure showing an example with a small degree of sharpness and the right figure showing an example with a tendency towards sharpness. Samples SP5, SP7, and SP8, which fall within the range indicated by arrow R1, tend to have a small degree of sharpness, as shown in the left figure. On the other hand, samples SP1, SP2, and SP9, which fall within the range indicated by arrow R2, tend to have a sharpness, as shown in the right figure.

[0027] The scratch resistance is shown in Figure 8. Figure 8 schematically illustrates wiping the surface with cloth 100. The upper part of Figure 8 is an example where there are few points on the surface that come into contact with cloth 100, i.e., an example corresponding to the area of ​​arrow R2 in Figure 5. The lower part of Figure 8 is an example where there are many points on the surface that come into contact with cloth 100, i.e., an example corresponding to the area of ​​arrow R1 in Figure 5. Assuming that the panel surface is wiped with cloth 100, the lower part of Figure 8, where there are many contact points on the surface, is more advantageous in terms of pressure distribution and abrasion resistance. This is why samples SP5, SP7, SP8, etc. have excellent scratch resistance. On the other hand, as the number of points protruding on the surface increases, the gradual change in effective refractive index, which is a characteristic of moth-eye designs, tends to disappear, and the low reflectivity characteristics decrease.

[0028] Taking these factors into consideration, samples SP3 and SP4 offer a good balance between low reflectivity and scratch resistance, and thus satisfy the cumulative frequency conditions of 10% and 90% shown in Figure 5.

[0029] By further tightening these conditions, a more desirable moth-eye structure 8 can be found. For example, Figure 9 specifies that the height value at a cumulative frequency of 10% is in the range of -50 nm to -100 nm, and the height value at a cumulative frequency of 90% is in the range of -125 nm to -200 nm. In Figure 9, the area enclosed by a dashed line and shaded is the range that satisfies this condition.

[0030] Samples SP3 and SP4 satisfy this condition. Samples of the other comparative examples do not satisfy this condition. The moth-eye structure 8 that satisfies this condition is a superior panel surface structure that achieves both low reflectivity and scratch resistance.

[0031] Incidentally, as described above, one factor in achieving both low reflectivity and scratch resistance in a surface-side texture is that the number of convex points on the surface side is distributed in an appropriate number, neither too few nor too many, until the cumulative frequency reaches 10%. Taking this into consideration, appropriate conditions for the moth-eye structure 8 can be added.

[0032] For example, the conditions defining the structure on the surface side are defined at a cumulative frequency of 5%. Figure 10 shows the range of cumulative frequencies of 20% or less on the horizontal axis and the height value on the vertical axis. The condition that the height value at a cumulative frequency of 5% is within the range of -30 nm to -90 nm is indicated by arrow R10. This defines the nano-shape of the region on the surface side, and the fact that the height value at a cumulative frequency of 5% falls within the range of -30 nm to -90 nm further indicates good surface properties.

[0033] For example, in addition to the conditions for cumulative frequencies of 10% and 90% shown in Figure 5 or Figure 9, a contoured shape that satisfies the condition at 5% is more desirable as a moth-eye structure 8.

[0034] Furthermore, one condition for a surface texture that achieves both low reflectivity and scratch resistance is that the distribution of heights to points that are elevated, i.e., deep, when viewed from the surface, is of an appropriate number. The aforementioned condition of a cumulative frequency of 90% defines this. Considering this further, for example, the slope of the cumulative frequency curves in Figures 5 and 9 also becomes a condition for determining a shape with good characteristics. That is, the fact that the slope of the curves in Figures 5 and 9 is as constant as possible indicates that a variety of heights are uniformly distributed.

[0035] Therefore, the condition is that the derivative (slope) when differentiating over the cumulative frequency range of 10% to 90% is within the range of -30 ≥ slope ≥ -1000. For example, Figure 11 shows the derivative for sample SP4. The horizontal axis is the cumulative frequency, and the vertical axis is the derivative. The area enclosed by the dashed line and shaded is the range of the above condition. The derivative of sample SP4 over the cumulative frequency range of 10% to 90% is less than or equal to -30 and is within the range of greater than or equal to -1000.

[0036] Satisfying this condition means that, within the cumulative frequency range of 10% to 90%, there are no special shapes that negatively affect the various properties, such as steps or columnar shapes in the convexity. Therefore, a surface texture that satisfies this condition is suitable for achieving both low reflectivity and scratch resistance. For example, a surface texture that satisfies the conditions for cumulative frequencies of 10% and 90% shown in Figure 5 or Figure 9, in addition to the slope condition in the range of 10% to 90%, is more desirable as a moth-eye structure 8. Furthermore, a surface texture that satisfies the above-mentioned condition for cumulative frequency of 5% is even better.

[0037] <2. Application to Various Display Devices> Examples of application of the layer structure 10 of the embodiment to various display devices will be specifically described. Figure 12 shows an example of a typical LCD structure.

[0038] The upper part of Figure 12 shows the schematic structure of an LCD without low-reflection functionality, and the lower part shows the schematic structure of an LCD with low-reflection functionality. In the case of an LCD, polarizing plates 21 are arranged on both sides of the cell layer 20, which is filled with liquid crystal cells.

[0039] In the upper example of Figure 12, the polarizing plate 21 is composed of a transparent adhesive layer 22, a film 23, PVA (polyvinyl alcohol) 24, and a surface film 25A, where the surface film 25A is a hard-coated film without low-reflection functionality. In the lower example of Figure 12, the surface film 25A is replaced with a hard-coated surface film 25B with low-reflection functionality.

[0040] Figure 13 shows an example of providing the layer structure 10 of this embodiment to these LCDs. The upper and lower sections of Figure 13 show an example of providing the layer structure 10, consisting of the diffusion adhesive layer 4, base material 5, and shaping layer 6 shown in Figure 1 or Figure 2, directly on top of the upper and lower structures of Figure 12. Specifically, a film with the shaping layer 6 formed on the base material 5 is attached to the upper and lower structures of Figure 12 using the diffusion adhesive layer 4 (diffusion OCA).

[0041] Furthermore, FIG. 14 shows an example in which the front film 25A (or 25B) of the polarizing plate 21 is replaced with the layered structure 10. That is, the polarizing plate 21 is obtained by attaching a film having a shaping layer 6 formed on a base material 5 to a transparent adhesive layer 22, a film 23, and a PVA 24.

[0042] FIG. 15 is a schematic structural example of a QD-OLED panel or an LED panel that is not provided with a circular polarizing plate. The cell / display device 30 shows a general structure of a QD-OLED panel or an LED panel. The upper part of FIG. 15 is an example in which a front film 31A with a hard coat having no low-reflection function is provided on the structure as the cell / display device 30. The lower part of FIG. 15 is an example in which a front film 31B with a hard coat having a low-reflection function is provided on the structure as the cell / display device 30.

[0043] FIG. 16 shows an example in which the layered structure 10 of the present embodiment is provided for these QD-OLED panels or LED panels. The upper part and the lower part of FIG. 16 are examples in which the layered structure 10 including the diffusion adhesive layer 4, the base material 5, and the shaping layer 6 shown in FIG. 1 and FIG. 2 is directly provided on the structures of the upper part and the lower part of FIG. 15. Specifically, on the structures of the upper part and the lower part of FIG. 16, a film having a shaping layer 6 formed on a base material 5 is attached by the diffusion adhesive layer 4 (diffusion OCA).

[0044] Furthermore, FIG. 17 shows an example in which the front film 31A (or 31B) is replaced with the layered structure 10. On the structure as the cell / display device 30, a film having a shaping layer 6 formed on a base material 5 is attached by the diffusion adhesive layer 4 (diffusion OCA).

[0045] FIG. 18 is a schematic structural example of a W-OLED panel or an LED panel that is provided with a circular polarizing plate. The cell / display device 40 shows a general structure of a W-OLED panel or an LED panel. A circular polarizing plate 41 is provided for the cell / display device 40.

[0046] The circular polarizing plate 41 is composed of a transparent adhesive layer 42, a λ / 4 layer 43, a transparent adhesive layer 44, a film 45, a PVA 46, and a front film 47. The front film 47 is a film with a hard coat that has no low-reflection function or has a low-reflection function.

[0047] Fig. 19 shows an example in which the layer structure 10 of the present embodiment is provided to this W-OLED panel or LED panel. Fig. 19 is an example in which the layer structure 10 including the diffusion adhesive layer 4, the base material 5, and the shaping layer 6 shown in Fig. 1 or Fig. 2 is provided as it is on the structure of Fig. 18. Specifically, a film in which the shaping layer 6 is formed on the base material 5 is attached onto the structure of Fig. 18 via the diffusion adhesive layer 4 (diffusion OCA).

[0048] Further, Fig. 20 shows an example in which the front film 47 of the circularly polarizing plate 41 is replaced with the layer structure 10. That is, the circularly polarizing plate 41 is obtained by attaching a film having the shaping layer 6 formed on the base material 5 to the transparent adhesive layer 22, the λ / 4 layer 43, the transparent adhesive layer 44, the film 45, and the PVA 46.

[0049] As described above, as shown in Fig. 13, Fig. 14, Fig. 16, Fig. 17, Fig. 19, and Fig. 20, the technology of the embodiment can be applied to various display devices. That is, in these structures, the moth-eye structure 8 having a concavo-convex shape that satisfies the above-described height value conditions at cumulative frequencies of 10% and 90% is provided on the surface side of the shaping layer 6. It is further preferable that the moth-eye structure 8 additionally satisfies the condition for the height value at a cumulative frequency of 5%, and the condition for the differential value in the range from 10% to 90% of cumulative frequency.

[0050] <3. Monitor Display Device> Fig. 21 shows a configuration example of a monitor display device 50 including the display panel 1 on which the layer structure 10 of the embodiment is formed.

[0051] The monitor display device 50 includes, for example, the display panel 1, a display driving circuit 51, and a control unit 52. The display driving circuit 51 generates a driving signal for the display panel 1 based on an input image signal Vin, and supplies the driving signal to the display panel 1. Accordingly, various types of display, such as display of moving images and still images, are performed on the display panel 1.

[0052] The control unit 52, for example, includes a microcomputer and controls the operation of the display drive circuit 51 based on input information Iin. The input information Iin is user operation information, instruction signals from connected devices, etc. Under the control of the control unit 52, the display drive circuit 51 outputs a drive signal to the display panel 1. As a result, an image is displayed on the display panel 1 in response to user operation or instructions from connected devices.

[0053] <4. Summary and Modifications> The following effects can be obtained according to the above embodiments.

[0054] The display device of this embodiment has a layer structure 10 on the surface of the display panel 1, in which a moth-eye structure 8 is formed by an uneven shape distributed with heights below the wavelength of visible light. The uneven shape is such that, when the apex of the most protruding convex part on the surface side is taken as the zero height position in the panel depth direction, the height value at which the cumulative frequency of the height values ​​at each position in the surface direction of the uneven shape reaches 10% is in the range of -40 nm to -110 nm, and the height value at which the cumulative frequency reaches 90% is in the range of -100 nm to -250 nm. By forming the moth-eye structure 8 with a height distribution defined based on the cumulative frequency in this way, it is possible to achieve both good low reflectivity and good scratch resistance, making it a desirable surface structure for a display device. Furthermore, in addition to scratch resistance, cleaning the surface of the display panel 1 with a cloth or the like becomes easier, providing an easy-to-handle display device.

[0055] In the embodiment, it was also stated that the condition for the uneven shape of the moth-eye structure 8 is that the height value at which the cumulative frequency reaches 10% is within the range of -50 nm to -100 nm, and the height value at which the cumulative frequency reaches 90% is within the range of -125 nm to -200 nm. The range defined by this condition is more desirable in terms of low reflectivity and scratch resistance.

[0056] In the embodiment, it was stated that the uneven shape of the moth-eye structure 8 is preferable if the height value at which the cumulative frequency is 5% is within the range of -30 nm to -90 nm. The cumulative frequency of 5% defines the nano-shape in the region close to the surface. This indicates the unevenness distribution near the surface. A shape in which the height value at the cumulative frequency of 5% falls within the range of -30 nm to -90 nm results in a shape with more desirable surface characteristics. This improves low reflectivity and scratch resistance.

[0057] In the embodiment, it was stated that the uneven shape of the moth-eye structure 8 is preferably such that the differential value of the cumulative frequency in the range where the cumulative frequency is 10% to 90% is -30 or less and falls within the range of -1000 or more. This defines the slope of the curve showing the cumulative frequency. When the slope (shape of the mid-slope of the convex) in the range where the cumulative frequency is 10% to 90% satisfies the above range, it indicates a shape that does not have special shapes that have a negative effect on various characteristics, such as shapes with steps or columnar shapes in the convex.

[0058] In the embodiment, the uneven shape of the moth-eye structure 8 is shown as being formed on a curved structure that provides an anti-glare function. For example, the layered structure 10 in Figure 1 shows an example having an anti-glare structure 7 whose surface is macroscopically curved compared to the moth-eye structure 8, and a moth-eye structure 8 as microscopic irregularities formed on the curved structure. This results in a structure that provides both surface reflection reduction and anti-glare functions through the moth-eye structure. The anti-glare structure 7 and the moth-eye structure 8 may be formed integrally, or they may be formed separately and then bonded together.

[0059] In the embodiment, an example was given in which the layer structure 10 is formed by attaching a film to a display panel 1 including a polarizing plate 21 or a circular polarizing plate 41 (see Figures 13, 14, and 18). When the display panel 1 has a structure in which the polarizing plate 21 is arranged on a cell layer 20, such as in an LCD, or a structure in which the circular polarizing plate 41 is arranged on a cell / display device 40, such as in a W-OLED panel or an LED panel, the layer structure 10 that suppresses surface reflection can be realized while maintaining the display panel structure by attaching a film or coating to the display panel structure.

[0060] In the embodiment, an example was given in which the layer structure 10 is formed by attaching a film to a display panel 1 that does not have a polarizing plate 21 or a circular polarizing plate 41 (see Figures 16 and 17). Even when the display panel 1 is, for example, a QD-OLED panel or an LED panel and does not have a polarizing plate 21 or a circular polarizing plate 41, the layer structure 10 that suppresses surface reflection can be realized while maintaining the display panel structure by attaching a film or coating to the display panel structure.

[0061] The effects of the display device described above can be obtained similarly when considered as a monitor display device 50.

[0062] The layer structure 10 shown in the embodiment, for example, the layer structure 10 of the diffusion adhesive layer 4, substrate 5, and shaping layer 6 in Figures 1 and 2, can be formed as a film. The film has a layer structure 10 having at least a diffusion adhesive layer 4 that has the function of being attached to the panel surface of a display device, and a shaping layer 6 that has an uneven shape formed on the surface side that includes heights of less than or equal to the wavelength of visible light. Such a film can be provided, for example, as an anti-reflective film for use in a display device. The moth-eye structure 8 on the outermost surface of this film has an uneven shape that satisfies the conditions of the height values ​​at the cumulative frequencies of 10% and 90% mentioned above. As a result, by attaching the film to a display panel, a display device or monitor display device 50 that achieves both low reflection and scratch resistance can be easily realized.

[0063] Furthermore, the effects described herein are merely illustrative and not limited to those described herein, and other effects may also occur.

[0064] The technology can also be configured as follows: (1) A display device having a layer structure on the surface of a display panel in which an uneven shape is formed that includes heights less than or equal to the wavelength of visible light, wherein the uneven shape is such that, when the apex of the most protruding convex part on the surface side is taken as the zero height position in the panel depth direction, the height value at which the cumulative frequency of the height values ​​at each position in the surface direction of the uneven shape reaches 10% is in the range of -40 nm to -110 nm, and the height value at which the cumulative frequency reaches 90% is in the range of -100 nm to -250 nm. (2) The display device according to (1) above, wherein the uneven shape is such that the height value at which the cumulative frequency reaches 10% is in the range of -50 nm to -100 nm, and the height value at which the cumulative frequency reaches 90% is in the range of -125 nm to -200 nm. (3) The display device according to (1) or (2) above, wherein the uneven shape is such that the height value at which the cumulative frequency reaches 5% is in the range of -30 nm to -90 nm. (4) The display device according to any one of (1) to (3) above, wherein the uneven shape is such that the differential value of the cumulative frequency in the range where the cumulative frequency is 10% to 90% is -30 or less and falls within the range of -1000 or more. (5) The display device according to any one of (1) to (4) above, wherein the uneven shape is formed on a curved structure that provides an anti-glare function. (6) The display panel has a structure in which a polarizing plate or a circular polarizing plate is provided on a cell layer, and the layer structure is formed by attaching a film to the display panel including the polarizing plate or circular polarizing plate. (7) The display panel has a structure in which a polarizing plate or a circular polarizing plate is not provided on a cell layer, and the layer structure is formed by attaching a film to the display panel.(8) A monitor display device comprising: a display device having a layer structure formed on the surface of a display panel; and a display drive circuit for performing a display on the display panel, wherein the display device has a layer structure formed on the surface of the display panel having an uneven shape distributed including heights less than or equal to the wavelength of visible light, and the uneven shape is such that, when the apex of the most protruding convex part on the surface side is taken as the zero height position in the panel depth direction, the height value at which the cumulative frequency of the height values ​​at each position in the surface direction of the uneven shape becomes 10% is in the range of -40 nm to -110 nm, and the height value at which the cumulative frequency becomes 90% is in the range of -100 nm to -250 nm. (9) A film body comprising a layer structure having at least a layer having the function of being attached to the panel surface of a display device, and a layer having an uneven shape formed on the surface side that includes heights of less than or equal to the wavelength of visible light, wherein the uneven shape is such that, when the apex of the most protruding convex part on the surface side is taken as the zero height position in the panel depth direction, the height value at which the cumulative frequency of the height values ​​at each position in the surface direction of the uneven shape becomes 10% is in the range of -40 nm to -110 nm, and the height value at which the cumulative frequency becomes 90% is in the range of -100 nm to -250 nm.

[0065] 1. Display panel 2. Diffusion functional layer 3. Low-reflection functional layer 4. Diffusion adhesive layer 5. Substrate 6. Shaping layer 7. Anti-glare structure 8. Moth-eye structure 50. Monitor display device

Claims

1. A display device having a layer structure on the surface of the display panel in which an uneven shape is formed with a height of less than or equal to the wavelength of visible light, wherein the uneven shape is such that, when the apex of the most protruding convex part on the surface side is taken as the zero height position in the panel depth direction, the height value at which the cumulative frequency of the height values ​​at each position in the surface direction of the uneven shape reaches 10% is in the range of -40 nm to -110 nm, and the height value at which the cumulative frequency reaches 90% is in the range of -100 nm to -250 nm.

2. The display device according to claim 1, wherein the uneven shape has a height value in which the cumulative frequency reaches 10% is in the range of -50 nm to -100 nm, and a height value in which the cumulative frequency reaches 90% is in the range of -125 nm to -200 nm.

3. The display device according to claim 1, wherein the uneven shape is such that the height value at which the cumulative frequency becomes 5% is within the range of -30 nm to -90 nm.

4. The display device according to claim 1, wherein the uneven shape is such that the differential value of the cumulative frequency in the range where the cumulative frequency is 10% to 90% is -30 or less and falls within the range of -1000 or more.

5. The display device according to claim 1, wherein the uneven shape is formed on a curved structure that provides an anti-glare function.

6. The display panel has a structure in which a polarizing plate or a circular polarizing plate is provided on a cell layer, and the layer structure is formed by attaching a film to the display panel including the polarizing plate or circular polarizing plate, according to claim 1.

7. The display panel has a structure in which no polarizing plate or circular polarizing plate is provided with respect to the cell layer, and the layer structure is formed by attaching a film to the display panel, as described in claim 1.

8. A monitor display device comprising: a display device having a layered structure formed on the surface of a display panel; and a display driving circuit for performing a display on the display panel, wherein the display device has a layered structure formed on the surface of the display panel having an uneven shape distributed including heights less than or equal to the wavelength of visible light, and the uneven shape is such that, when the apex of the most protruding convex part on the surface side is taken as the zero height position in the panel depth direction, the height value at which the cumulative frequency of the height values ​​at each position in the surface direction of the uneven shape reaches 10% is in the range of -40 nm to -110 nm, and the height value at which the cumulative frequency reaches 90% is in the range of -100 nm to -250 nm.

9. A film body comprising a layer structure having at least a layer having the function of being attached to the panel surface of a display device, and a layer having an uneven shape formed on the surface side that includes heights less than or equal to the wavelength of visible light, wherein the uneven shape is such that, when the apex of the most protruding convex part on the surface side is taken as the zero height position in the panel depth direction, the height value at which the cumulative frequency of the height values ​​at each position in the surface direction of the uneven shape reaches 10% is in the range of -40 nm to -110 nm, and the height value at which the cumulative frequency reaches 90% is in the range of -100 nm to -250 nm.

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