Display device and method of manufacturing optical film

Abstract

A display device includes a display panel that emits light from a plurality of pixels arranged at a predetermined pixel arrangement pitch, and an optical film that is disposed on the display panel to transmit light from the plurality of pixels, has a first optical function portion and a second optical function portion that differ in optical performance from each other, and has the first optical function portion and the second optical function portion arranged at a predetermined function portion arrangement pitch, respectively. When the pixel arrangement pitch is p (μm), the function portion arrangement pitch is q (μm), and a distance between a surface of the pixel on the optical film side and a surface of the optical film on the pixel side in a direction in which the surfaces face each other is d (μm), q ≤ 0.5p and tan (asin (0.7 / q)) < p / d are satisfied.

Description

Technical Field

[0001] The present invention relates to a display device having an optical film that produces an optical effect on light emitted from the display surface of the display device, and a method for manufacturing the optical film. Background Technology

[0002] Liquid crystal displays (LCDs), as an example of display devices, are used in various fields. In addition, organic LED (organic light-emitting diode) display devices are becoming increasingly popular recently.

[0003] In liquid crystal display devices, the color tone of the image within the field of view can sometimes change significantly due to variations in light intensity depending on the viewing angle and light leakage in the tilt direction.

[0004] On the other hand, in organic LED display devices, blue shift is prone to occur in images viewed at an angle. Blue shift is the phenomenon that an image viewed from an angle appears bluer compared to an image viewed from the front. That is, even in images displayed on organic LED display devices, the hue within the field of view can sometimes change significantly due to this blue shift.

[0005] The color variation within the aforementioned field of view is the main reason for the degraded image display quality. Other factors affecting display quality include, for example, contrast deviation within the field of view. Various technologies have been proposed to improve image display quality, such as optical films applied to the display surface of a display device to improve image display quality, disclosed in JPH7-43704A, JP3272833B, JP3621959B, JP2016-126350A, JP2012-145944A, JP2011-118393A, US9507059A, and JP2018-5113A. Summary of the Invention

[0006] The aforementioned optical films include: optical films in which two portions with different refractive indices are arranged at a constant spacing; and optical films in which light-transmitting portions and light-absorbing portions are arranged at a constant spacing. On the other hand, display panels that constitute a display device together with such optical films typically have pixels arranged at a constant spacing. Therefore, when the display panel and the optical film overlap, moiré patterns are easily generated. Since moiré patterns degrade the quality of the displayed image, it is desirable to suppress or make them less noticeable.

[0007] In addition, diffraction-induced image blurring sometimes occurs in the aforementioned optical films. This image blurring also degrades the quality of the displayed image, so it is desirable to suppress or make it less noticeable.

[0008] The present invention was made in view of the above-mentioned actual situation, and its object is to provide a display device and a method for manufacturing an optical film that can suppress the impairment of the visibility of the displayed image due to moiré fringes and diffraction.

[0009] The display device of the present invention includes:

[0010] A display panel that emits light from a plurality of pixels arranged at a specified pixel spacing; and

[0011] An optical film, disposed on the display panel to allow light from the aforementioned plurality of pixels to pass through, has a first optical functional portion and a second optical functional portion having different optical properties, wherein the first optical functional portion and the second optical functional portion are arranged at a predetermined functional portion arrangement spacing.

[0012] Set the pixel spacing to p (μm).

[0013] The spacing between the above functional units is set to q (μm).

[0014] When the distance between the surface of the aforementioned pixel on the optical film side and the surface of the aforementioned optical film on the pixel side in the mutually facing directions is set as d (μm),

[0015] The condition q≤0.5p and tan(asin(0.7 / q))<p / d holds true.

[0016] In addition, the display device of the present invention includes:

[0017] A display panel that emits light from a plurality of pixels arranged at a specified pixel spacing; and

[0018] An optical film, disposed on the display panel to allow light from the aforementioned plurality of pixels to pass through, has a first optical functional portion and a second optical functional portion having different optical properties, wherein the first optical functional portion and the second optical functional portion are arranged at a predetermined functional portion arrangement spacing.

[0019] Set the pixel spacing to p (μm).

[0020] The spacing between the above functional units is set to q (μm).

[0021] The first optical functional unit and the second optical functional unit are arranged at a functional unit arrangement spacing q in the same direction as the plurality of pixels are arranged at a pixel arrangement spacing p.

[0022] When the distance between the surface of the aforementioned pixel on the optical film side and the surface of the aforementioned optical film on the pixel side in the mutually facing directions is set as d (μm),

[0023] The condition q≤0.5p and tan(asin(0.7 / q))<p / d holds true.

[0024] In addition, the display device of the present invention includes:

[0025] A display panel that emits light from a plurality of pixels arranged at a specified pixel spacing; and

[0026] An optical film, disposed on the display panel to allow light from the aforementioned plurality of pixels to pass through, has a first optical functional portion and a second optical functional portion having different optical properties, wherein the first optical functional portion and the second optical functional portion are arranged at a predetermined functional portion arrangement spacing.

[0027] The aforementioned pixels are arranged in a first direction and in a second direction orthogonal to the first direction.

[0028] The first optical functional unit and the second optical functional unit are arranged alternately in the first direction and the second direction, respectively.

[0029] Let the pixel arrangement spacing of the plurality of pixels arranged in the first direction be defined as the first pixel arrangement spacing p1 (μm), and let the pixel arrangement spacing of the plurality of pixels arranged in the second direction be defined as the second pixel arrangement spacing p2 (μm).

[0030] The arrangement spacing of the first optical functional unit and the second optical functional unit arranged in the first direction is defined as the first functional unit arrangement spacing q1 (μm), and the arrangement spacing of the first optical functional unit and the second optical functional unit arranged in the second direction is defined as the second functional unit arrangement spacing q2 (μm).

[0031] When the distance between the surface of the aforementioned pixel on the optical film side and the surface of the aforementioned optical film on the pixel side in the mutually facing directions is set as d (μm),

[0032] The following conditions hold true: q1≤0.5p1 and tan(asin(0.7 / q1))<p1 / d, and q2≤0.5p2 and tan(asin(0.7 / q2))<p2 / d.

[0033] The aforementioned pixels can be arranged in a bar-like pattern, with multiple sub-pixels.

[0034] The aforementioned pixels can be arranged in a five-tile configuration to form multiple sub-pixels.

[0035] The aforementioned display panel can be an organic LED panel.

[0036] The aforementioned display panel can be an LCD panel.

[0037] The method for manufacturing the optical film of the present invention is a method for manufacturing an optical film disposed on a display panel, wherein the display panel emits light from a plurality of pixels arranged at a predetermined pixel spacing, wherein...

[0038] The aforementioned optical film has a first optical functional portion and a second optical functional portion with different optical properties, and the first optical functional portion and the second optical functional portion are arranged at a predetermined functional portion spacing.

[0039] The manufacturing method of this optical film includes the following steps:

[0040] The process for the specific pixel arrangement spacing p (μm) mentioned above;

[0041] When the optical film is disposed on the display panel, the process of determining the distance d (μm) between the optical film side surface of a specific pixel and the pixel side surface of the optical film in mutually opposing directions; and

[0042] The process of setting the spacing between the above-mentioned functional parts to q (μm) is a specific process where q ≤ 0.5p and tan(asin(0.7 / q)) < p / d holds true.

[0043] The optical film is manufactured based on the specific arrangement spacing q (μm) of the aforementioned functional parts.

[0044] Furthermore, the method for manufacturing the optical film of the present invention is a method for manufacturing an optical film disposed on a display panel, wherein the display panel emits light from a plurality of pixels arranged in a first direction with a predetermined pixel spacing and arranged in a second direction orthogonal to the first direction, wherein...

[0045] The aforementioned optical film has a first optical functional portion and a second optical functional portion with different optical properties. The first optical functional portion and the second optical functional portion are arranged alternately in the first direction and the second direction with a predetermined functional portion arrangement spacing, respectively.

[0046] The manufacturing method of this optical film includes the following steps:

[0047] The process of specifying the pixel arrangement spacing of the plurality of pixels arranged in the first direction as a first pixel arrangement spacing p1 (μm) and specifying the pixel arrangement spacing of the plurality of pixels arranged in the second direction as a second pixel arrangement p2 (μm);

[0048] When the optical film is disposed on the display panel, the process of determining the distance d (μm) between the optical film side surface of a specific pixel and the pixel side surface of the optical film in mutually opposing directions; and

[0049] The arrangement spacing of the first optical functional unit and the second optical functional unit arranged in the first direction is defined as the first functional unit arrangement spacing q1 (μm), and the arrangement spacing of the first optical functional unit and the second optical functional unit arranged in the second direction is defined as the second functional unit arrangement spacing q2 (μm). A specific process is described where q1 ≤ 0.5p1 and tan(asin(0.7 / q1)) < p1 / d holds, and q2 ≤ 0.5p2 and tan(asin(0.7 / q2)) < p2 / d holds.

[0050] The optical film is manufactured based on the specific arrangement spacing q1 (μm) of the first functional part and the arrangement spacing q2 (μm) of the second functional part.

[0051] According to the present invention, a display device capable of suppressing the impairment of the visibility of the displayed image due to moiré fringes and diffraction can be provided. Attached Figure Description

[0052] Figure 1 This is a schematic diagram illustrating the configuration of a display device according to one embodiment of the present invention.

[0053] Figure 2 It is shown Figure 1 The diagram shows the pixel arrangement of the display device.

[0054] Figure 3A It is shown Figure 1 A diagram of the optical film in the display device shown.

[0055] Figure 3B It is shown Figure 3A A diagram of a deformed optical film.

[0056] Figure 4 It is shown Figure 1 A diagram showing a modified example of the display device.

[0057] Figure 5 It is shown Figure 1 A diagram showing a modified example of the display device. Detailed Implementation

[0058] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0059] It should be noted that the terms "sheet," "film," and "plate" used in this specification are not distinguished solely by their different names. Therefore, for example, "sheet" also includes components that can be called films or plates. Furthermore, in this specification, "sheet surface (plate surface, film surface)" refers to a surface that aligns with the planar direction (surface direction) of the sheet-like component when viewed as a whole and in a general view. It should be noted that "sheet surface (plate surface, film surface)" is sometimes also referred to as the main surface. Additionally, in this specification, the normal direction of a sheet-like component refers to the normal direction of the sheet surface of the sheet-like component.

[0060] Figure 1 This diagram schematically illustrates the configuration of a display device 10 according to one embodiment. The display device 10 includes an organic LED (organic light-emitting diode) panel 20 and an optical film 100. As an example, the display device 10 in this embodiment is a television set, but it can also be a tablet computer, a smartphone, a computer monitor, a car navigation system, etc.

[0061] It should be noted that the organic LED panel 20 and the optical film 100 can be adjacent to each other. Furthermore, a circular polarizer, a touch panel, a protective glass, etc., can be disposed between the organic LED panel 20 and the optical film 100. When a circular polarizer, a touch panel, a protective glass, etc., are disposed between the organic LED panel 20 and the optical film 100, adjacent components can be joined using an adhesive layer.

[0062] The organic LED panel 20 is plate-shaped, and the optical film 100 is configured such that its surface is parallel to the surface of the organic LED panel 20. Figure 1 In the figures used in the following description, symbol D1 represents the first direction, which is parallel to the surface of the organic LED panel 20 and the film surface of the optical film 100. Symbol D2 represents the second direction, which is parallel to the surface of the organic LED panel 20 and the film surface of the optical film 100 and orthogonal to the first direction D1. In addition, symbol D3 represents the third direction, which is orthogonal to both the first direction D1 and the second direction D2.

[0063] The organic LED panel 20 has multiple pixels 21 composed of multiple sub-pixels of different colors (21R, 21G, 21B in this example), from which light for image formation is emitted. Figure 2 As shown, in this embodiment, the pixel 21 is formed by arranging multiple sub-pixels 21R, 21G, and 21B in a strip-like manner.

[0064] Subpixel 21R emits red light, subpixel 21G emits green light, and subpixel 21B emits blue light. It should be noted that, in addition to subpixels 21R, 21G, and 21B, pixel 21 may also have a subpixel that emits white light. The organic LED panel 20 can be of a type where white light is colored and transmitted through a color filter, or it can be of a so-called "separately coated" type where RGB subpixels emit light independently.

[0065] Reference Figure 1 and Figure 2 Multiple pixels 21 are arranged at a first pixel spacing p1 in the first direction D1 and at a second pixel spacing p2 in the second direction D2. In this embodiment, the first pixel spacing p1 and the second pixel spacing p2 are set to the same constant value, but they can also be set to different values.

[0066] An optical film 100 is disposed on an organic LED panel 20 to transmit light from a plurality of pixels 21, and faces the organic LED panel 20 directly or through a plurality of layers. The optical film 100 has a first optical functional section 101 and a second optical functional section 102 with different optical properties. Furthermore, the first optical functional section 101 and the second optical functional section 102 are arranged differently in a first direction D1 with a predetermined functional section arrangement spacing q. The functional section arrangement spacing q is a constant value.

[0067] In this embodiment, the refractive index of the first optical functional unit 101 is different from that of the second optical functional unit 102. At the interface between the first optical functional unit 101 and the second optical functional unit 102, light from the organic LED panel 20 is refracted or reflected, thereby improving the display quality of the image observed through the optical film 100. The illustrated first optical functional unit 101 and second optical functional unit 102 have, for example, an interface that is inclined to contact each other in the first direction D1. However, this shape is not particularly limited and can be different from the illustrated shape. As an example, Figure 1 The second optical functional unit 102 shown, in a cross-sectional view along the thickness direction, is one side of the optical film 100, specifically the back side, gradually tapering towards the organic LED panel 20 side, with its tip being flat and parallel to the back surface of the optical film 100. The side surface located between the flat surface serving as the tip of the second optical functional unit 102 and its base end... Figure 1 In the cross-sectional view along the thickness direction, it appears as an arc or multi-tiered shape; more specifically, it is an arc protruding from the side of the first optical functional unit 101. However, the side of the second optical functional unit 102... Figure 1In the cross-sectional view along the thickness direction shown, the section may also be recessed to the side opposite to the first optical functional unit 101. Furthermore, the refractive index of the first optical functional unit 101 may be lower or higher than the refractive index of the second optical functional unit 102.

[0068] Figure 1 The symbol d in the figure represents the distance between the surface of the optical film 100 side of pixel 21 and the surface of the optical film 100 on the pixel 21 side in the direction of mutual opposition.

[0069] Here, in the display device 10 of this embodiment, when “μm” is used to represent the unit of the first pixel arrangement spacing p1, the second pixel arrangement spacing p2, the functional part arrangement spacing q and the distance d respectively, the following conditions (1) and (2) are met.

[0070] Condition (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d

[0071] Condition (2): q≤0.5p² and tan(asin(0.7 / q))<p² / d

[0072] When conditions (1) and / or (2) are met, it is possible to suppress the impairment of the visibility of the displayed image formed by the display device 10 due to moiré fringes and diffraction. The inventors have conducted in-depth research on the relationship between the spacing of moiré fringes, which are difficult to observe even when moiré fringes are generated, and the pixel spacing p1, p2, and the relationship between the location of image blur, which is difficult to observe even when image blur occurs due to diffraction, and the pixel spacing p1, p2, and have specified the above relationships.

[0073] In conditions (1) and (2), firstly, "q≤0.5p1" and "q≤0.5p2" are determined as conditions to make moiré fringes less observable. Moiré fringes are generated periodically in a stripe-like pattern due to the periodic deviation between the pixel arrangement spacing p1, p2 and the functional unit arrangement spacing q. The spacing PM that periodically generates moiré fringes can be specified by (p1×q) / (p1-q) or (p2×q) / (p2-q). It should be noted that the latter formula is applicable to the case where the first optical functional unit 101 and the second optical functional unit 102 are alternately arranged in the second direction D2. The inventors conducted repeated and in-depth research and experiments, and found that when the spacing PM of the moiré fringes is the same as or less than the pixel arrangement spacing p1, p2, the moiré fringes become less noticeable. Furthermore, as conditions to satisfy this condition, "q≤0.5p1" and "q≤0.5p2" were specifically obtained.

[0074] On the other hand, "tan(asin(0.7 / q)) < p1 / d" and "tan(asin(0.7 / q)) < p2 / d" are determined as conditions to make the image blur caused by diffraction difficult to observe. When diffraction occurs due to the first optical functional unit 101 or the second optical functional unit 102 of the optical film 100, the first image blur (diffraction fringe) appears at a position d × tan(asin(λ / q)) centered on the first optical functional unit 101 or the second optical functional unit 102. λ is the wavelength; the wavelength of red light is approximately 0.7 μm, the wavelength of blue light is approximately 0.47 μm, and the wavelength of green light is approximately 0.52 μm. Based on such wavelengths, with the first optical functional unit 101 or the second optical functional unit 102 as the center, the first image blur (diffraction fringe) corresponding to red light appears at the position of d×tan(asin(0.7 / q)), and the first image blur (diffraction fringe) corresponding to blue light and green light appears inside the first image blur corresponding to red light.

[0075] The inventors conducted repeated and in-depth research and experiments, and found that when the position of the first image blur, centered on the first optical functional unit 101 or the second optical functional unit 102, is smaller than the pixel spacing p1 or p2, the image blur becomes less noticeable. Furthermore, it was found that if the position of the first image blur corresponding to red light is smaller than the pixel spacing p1 or p2, the first image blur corresponding to red light, blue light, and green light, respectively, becomes less noticeable. Moreover, as conditions for satisfying this condition, the following were specifically obtained: "tan(asin(0.7 / q)) < p1 / d" and "tan(asin(0.7 / q)) < p2 / d".

[0076] Therefore, when conditions (1) and / or (2) above are met, it is possible to suppress the impairment of the visibility of the displayed image due to moiré fringes and diffraction. The inventors have confirmed the effect of meeting conditions (1) and / or (2) above through various prototypes.

[0077] In conditions (1) and (2) above, the pixel spacing p1, p2 and the functional unit spacing q are not particularly limited. For example, the pixel spacing p1, p2 can be set to 316μm or less in a 55-inch monitor and 155μm or less in a 17-inch monitor. As technology advances, these pixel spacings p1, p2 will gradually decrease, and the resolution is expected to increase in the future.

[0078] The formulas defined by conditions (1) and (2) above are useful when designing the desired optical film flexibly according to the future trend of pixel arrangement spacing.

[0079] It should be noted that, as an example, Figure 1 The first optical functional unit 101 and the second optical functional unit 102 shown extend in a straight line along the second direction D2. In this case, when viewed from the third direction D3, the first optical functional unit 101 and the second optical functional unit 102 become Figure 3A The shape shown. In this case, if at least condition (1): "q≤0.5p1 and tan(asin(0.7 / q))<p1 / d" is met, then the visibility of the displayed image can be suppressed from being impaired by moiré fringes and diffraction. That is, as long as the pixel arrangement spacing and the functional part arrangement spacing specified in the same direction at least satisfy, for example, condition (1).

[0080] In addition, such as Figure 3B As shown, the second optical functional unit 102 can be in the shape of a frustum of a square pyramid, a truncated cone, or a two-dimensional arrangement such as a matrix. Figure 3B In this configuration, the spacing of the second optical functional units 102 in the first direction D1 is defined as the first functional unit arrangement spacing q1. The spacing of the second optical functional units 102 in the second direction D2 is defined as the second functional unit arrangement spacing q2. That is, in this configuration, the first optical functional units 101 and the second optical functional units 102 are arranged alternately in the first direction D1 with the first functional unit arrangement spacing q1, and alternately in the second direction D2 with the second functional unit arrangement spacing q2.

[0081] In this case, the preferred conditions (1): "q1≤0.5p1 and tan(asin(0.7 / q1))<p1 / d" and (2): "q2≤0.5p2 and tan(asin(0.7 / q2))<p2 / d" are met. When both conditions are met, the impairment of the visibility of the displayed image due to moiré fringes and diffraction can be effectively suppressed. However, if only one condition is met, the impairment of the visibility of the displayed image due to moiré fringes and diffraction can also be suppressed.

[0082] It should be noted that the plurality of second optical functional parts 102 can be connected in a grid-like shape, or they can be formed, for example, in a hexagonal pyramid shape and arranged in a honeycomb pattern.

[0083] in addition, Figure 1 The organic LED panel 20 and the optical film 100 shown are adjacent to each other, with an air layer between them. Alternatively, a circular polarizer, a touch panel, or protective glass may also be disposed between the organic LED panel 20 and the optical film 100. Thus, when one or more components exist between the organic LED panel 20 and the optical film 100, the refractive indices of these components can be considered in conditions (1) and (2). In this case, the distance d in conditions (1) and (2) can be replaced with n×d, representing the optical path length. n is the refractive index, typically in the range of 1.0 to 1.8.

[0084] Hereinafter, an example of a method for manufacturing the optical film 100 of this embodiment will be described.

[0085] First, a display panel, such as an organic LED panel 20, is specifically set as the object of the optical film 100. Then, the first pixel arrangement spacing p1 and the second pixel arrangement spacing p2 of the specific organic LED panel 20 are determined.

[0086] Next, the distance d (μm) between the surface of the optical film 100 side of the pixel 21 and the surface of the optical film 100 on the pixel 21 side of the pixel 21 side when the optical film 100 is disposed on the organic LED panel 20 is measured in opposite directions. This distance d can vary depending on whether a component is provided between the optical film 100 and the organic LED panel 20, the thickness of the manufactured display device, etc., and needs to be appropriately specified according to the specifications of the display device. Furthermore, when considering the refractive index n of the component between the organic LED panel 20 and the optical film 100, the optical path length n×d is specified.

[0087] Subsequently, based on the specific first pixel arrangement spacing p1, second pixel arrangement spacing p2, and distance d as described above, the functional part arrangement spacing q (μm) of the optical film 100 is determined by the specific conditions (1): q ≤ 0.5p1 and tan(asin(0.7 / q)) < p1 / d and / or condition (2): q ≤ 0.5p2 and tan(asin(0.7 / q)) < p2 / d. Furthermore, an optical film 100 is manufactured with the first optical functional part 101 and the second optical functional part 102 arranged based on the specific functional part arrangement spacing q.

[0088] According to the manufacturing method described above, it is possible to easily manufacture a display device that can suppress the impairment of the visibility of the displayed image due to moiré fringes and diffraction.

[0089] The above description illustrates one embodiment of the present invention, but this embodiment is merely an example, and various modifications can be made to the display device 10. For example, such as... Figure 4 As shown, pixel 21 can be arranged in a five-tile configuration with multiple sub-pixels 21R, 21G, and 21B. Additionally, as... Figure 5 As shown, the optical film 100 can be a so-called privacy film. In this case, the first optical functional section 101 is a light-absorbing section, and the second optical functional section 102 is a light-transmitting section. Alternatively, although not shown, a liquid crystal panel can be used instead of an organic LED panel 20 to construct the display device.

[0090] When pixel 21 is arranged with multiple sub-pixels 21R, 21G, and 21B in a five-tile configuration, it can sometimes be used in conjunction with... Figure 4The different directions shown, either the first direction D1 or the second direction D2, define the pixel arrangement direction. Figure 4 In the example, for instance, the direction tilted at 45 degrees relative to the first direction D1 or the second direction D2 can also be defined as the pixel arrangement direction. In this case, in conditions (1) and (2), the pixel arrangement spacing in the pixel arrangement direction that forms the minimum angle (including 0 degrees) between the direction and the direction of the specified functional part arrangement spacing can be adopted. In other words, in this embodiment, the following situation is assumed: the optical film is designed by adopting the pixel arrangement spacing and functional part arrangement spacing that are defined as having the same direction in conditions (1) and (2); the direction of the pixel arrangement spacing that forms the minimum angle other than 0 degrees and the direction of the specified functional part arrangement spacing are specifically defined, and the pixel arrangement spacing and functional part arrangement spacing in these two specific directions are adopted in conditions (1) and (2) to design the optical film.

[0091] Example

[0092] The embodiments and comparative examples of the present invention will now be described.

[0093] The display devices in Examples 1 to 9 are Figure 1 The device shown satisfies conditions (1) and (2) described in the above embodiments. On the other hand, although the display devices of Comparative Examples 1 to 4 have Figure 1 The method shown does not satisfy the above conditions (1) and (2). The display devices of the embodiments and comparative examples have specific dimensions for the display device 10 described in the embodiments. The optical film 100 is strip-shaped, and the first optical functional part 101 and the second optical functional part 102 are arranged in the first direction D1 with a functional part arrangement spacing q.

[0094] (Example 1)

[0095] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0096] The spacing q between the functional units is 55 μm.

[0097] The distance d is 1270 μm.

[0098] 0.5p1 and 0.5p2 are 55.5 μm.

[0099] tan(asin(0.7 / q)) is approximately 0.0127, and p1 / d and p2 / d are approximately 0.087.

[0100] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0101] (Example 2)

[0102] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0103] The spacing q between the functional units is 43.8 μm.

[0104] The distance d is 1270 μm.

[0105] 0.5p1 and 0.5p2 are 55.5 μm.

[0106] tan(asin(0.7 / q)) is approximately 0.0159, and p1 / d and p2 / d are approximately 0.087.

[0107] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0108] (Example 3)

[0109] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0110] The spacing q between the functional units is 31.8 μm.

[0111] The distance d is 1270 μm.

[0112] 0.5p1 and 0.5p2 are 55.5 μm.

[0113] tan(asin(0.7 / q)) is approximately 0.0220, and p1 / d and p2 / d are approximately 0.087.

[0114] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0115] (Example 4)

[0116] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0117] The spacing q between the functional units is 25.0 μm.

[0118] The distance d is 1270 μm.

[0119] 0.5p1 and 0.5p2 are 55.5 μm.

[0120] tan(asin(0.7 / q)) is approximately 0.0280, and p1 / d and p2 / d are approximately 0.087.

[0121] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0122] (Example 5)

[0123] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0124] The spacing q between the functional units is 8.6 μm.

[0125] The distance d is 1270 μm.

[0126] 0.5p1 and 0.5p2 are 55.5 μm.

[0127] tan(asin(0.7 / q)) is approximately 0.08615, and p1 / d and p2 / d are approximately 0.087.

[0128] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0129] (Example 6)

[0130] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0131] The spacing q between the functional units is 8.1 μm.

[0132] The distance d is 1270 μm.

[0133] 0.5p1 and 0.5p2 are 55.5 μm.

[0134] tan(asin(0.7 / q)) is approximately 0.0867, and p1 / d and p2 / d are approximately 0.087.

[0135] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0136] (Example 7)

[0137] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0138] The spacing q between the functional units is 3.0 μm.

[0139] The distance d is 450 μm.

[0140] 0.5p1 and 0.5p2 are 55.5 μm.

[0141] tan(asin(0.7 / q)) is approximately 0.0240, and p1 / d and p2 / d are approximately 0.2466.

[0142] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0143] (Example 8)

[0144] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0145] The spacing q between the functional units is 1.6 μm.

[0146] The distance d is 220 μm.

[0147] 0.5p1 and 0.5p2 are 55.5 μm.

[0148] tan(asin(0.7 / q)) is approximately 0.0477, and p1 / d and p2 / d are approximately 0.5045.

[0149] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0150] (Example 9)

[0151] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0152] The spacing q between the functional units is 1.0 μm.

[0153] The distance d is 100 μm.

[0154] 0.5p1 and 0.5p2 are 55.5 μm.

[0155] tan(asin(0.7 / q)) is approximately 0.9802, and p1 / d and p2 / d are 1.11.

[0156] Therefore, conditions (1): q≤0.5p1 and tan(asin(0.7 / q))<p1 / d and conditions (2): q≤0.5p2 and tan(asin(0.7 / q))<p2 / d are true.

[0157] (Comparative Example 1)

[0158] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0159] The spacing q between the functional units is 60 μm.

[0160] The distance d is 1270 μm.

[0161] 0.5p1 and 0.5p2 are 55.5 μm.

[0162] tan(asin(0.7 / q)) is approximately 0.01166, and p1 / d and p2 / d are approximately 0.087.

[0163] Therefore, q≤0.5p1 and q≤0.5p2 do not hold. On the other hand, tan(asin(0.7 / q))<p1 / d and tan(asin(0.7 / q))<p2 / d hold.

[0164] (Comparative Example 2)

[0165] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0166] The spacing q between the functional units is 3.0 μm.

[0167] The distance d is 1270 μm.

[0168] 0.5p1 and 0.5p2 are 55.5 μm.

[0169] tan(asin(0.7 / q)) is approximately 0.02487, and p1 / d and p2 / d are approximately 0.2466.

[0170] Therefore, q≤0.5p1 and q≤0.5p2 hold true, but tan(asin(0.7 / q))<p1 / d and tan(asin(0.7 / q))<p2 / d do not hold true.

[0171] (Comparative Example 3)

[0172] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0173] The spacing q between the functional units is 1.6 μm.

[0174] The distance d is 450 μm.

[0175] 0.5p1 and 0.5p2 are 55.5 μm.

[0176] tan(asin(0.7 / q)) is approximately 0.0486, and p1 / d and p2 / d are approximately 0.24665.

[0177] Therefore, q≤0.5p1 and q≤0.5p2 hold true, but tan(asin(0.7 / q))<p1 / d and tan(asin(0.7 / q))<p2 / d do not hold true.

[0178] (Comparative Example 4)

[0179] The spacing between the first pixel (p1) and the second pixel (p2) is 111 μm.

[0180] The spacing q between the functional units is 1.0 μm.

[0181] The distance d is 220 μm.

[0182] 0.5p1 and 0.5p2 are 55.5 μm.

[0183] tan(asin(0.7 / q)) is approximately 0.9802, and p1 / d and p2 / d are 0.5045.

[0184] Therefore, q≤0.5p1 and q≤0.5p2 hold true, but tan(asin(0.7 / q))<p1 / d and tan(asin(0.7 / q))<p2 / d do not hold true.

[0185] The evaluation was conducted by visually verifying the degree of moiré fringes and image blurring. In any of Examples 1-9, neither the moiré fringes nor the image blurring was noticeable. On the other hand, the moiré fringes were slightly noticeable in Comparative Example 1. The image blurring was very noticeable in Comparative Examples 2-4. These results also confirm the effectiveness of the present invention.

Claims

1. A display device comprising: A display panel that emits light from a plurality of pixels arranged at a specified pixel spacing; and An optical film, disposed on the display panel to allow light from the plurality of pixels to pass through, has a first optical functional portion and a second optical functional portion having different optical properties, the first optical functional portion and the second optical functional portion being arranged at a predetermined functional portion arrangement spacing. The spacing between the functional units is constant. An air layer is provided between the display panel and the optical film, or at least one of a circular polarizer, a touch panel, and a protective glass is provided. Set the pixel arrangement spacing to p. The spacing between the functional units is set to q. When the distance between the surface of the pixel on the optical film side and the surface of the optical film on the pixel side in the mutually facing directions is d, where, The units for p, q, and d are μm. The condition q≤0.5p and tan(asin(0.7 / q))<p / d holds true.

2. A display device comprising: A display panel that emits light from a plurality of pixels arranged at a specified pixel spacing; and An optical film, disposed on the display panel to allow light from the plurality of pixels to pass through, has a first optical functional portion and a second optical functional portion having different optical properties, the first optical functional portion and the second optical functional portion being arranged at a predetermined functional portion arrangement spacing. The spacing between the functional units is constant. An air layer is provided between the display panel and the optical film, or at least one of a circular polarizer, a touch panel, and a protective glass is provided. Set the pixel arrangement spacing to p. The spacing between the functional units is set to q. The first optical functional unit and the second optical functional unit are respectively arranged with a functional unit arrangement spacing q in the same direction as the plurality of pixels are arranged with a pixel arrangement spacing p. When the distance between the surface of the pixel on the optical film side and the surface of the optical film on the pixel side in the mutually facing directions is d, where, The units for p, q, and d are μm. The condition q≤0.5p and tan(asin(0.7 / q))<p / d holds true.

3. A display device comprising: A display panel that emits light from a plurality of pixels arranged at a specified pixel spacing; and An optical film, disposed on the display panel to allow light from the plurality of pixels to pass through, has a first optical functional portion and a second optical functional portion having different optical properties, the first optical functional portion and the second optical functional portion being arranged at a predetermined functional portion arrangement spacing. The spacing between the functional units is constant. An air layer is provided between the display panel and the optical film, or at least one of a circular polarizer, a touch panel, and a protective glass is provided. The plurality of pixels are arranged in a first direction and in a second direction orthogonal to the first direction. The first optical functional unit and the second optical functional unit are arranged alternately in the first direction and the second direction, respectively. The pixel arrangement spacing of the plurality of pixels in the first direction is defined as the first pixel arrangement spacing p1, and the pixel arrangement spacing of the plurality of pixels in the second direction is defined as the second pixel arrangement spacing p2. The spacing between the first optical functional part and the second optical functional part arranged in the first direction is defined as the first functional part spacing q1, and the spacing between the first optical functional part and the second optical functional part arranged in the second direction is defined as the second functional part spacing q2. When the distance between the surface of the pixel on the optical film side and the surface of the optical film on the pixel side in the mutually facing directions is d, where, The units of p1, p2, q1, q2, and d are μm. The following conditions hold true: q1≤0.5p1 and tan(asin(0.7 / q1))<p1 / d, and q2≤0.5p2 and tan(asin(0.7 / q2))<p2 / d.

4. The display device according to any one of claims 1 to 3, wherein, The pixels are arranged in a strip-like pattern with multiple sub-pixels.

5. The display device according to any one of claims 1 to 3, wherein, The pixel is arranged in a five-tile configuration with multiple sub-pixels.

6. The display device as claimed in claim 1, wherein, The display panel is an organic LED panel.

7. The display device as claimed in claim 1, wherein, The display panel is a liquid crystal panel.

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