Display device with decorative sheet

Abstract

To suppress generation of moire.SOLUTION: A display device 1 with a decorative sheet includes: a display unit 10; and a decorative sheet 20 arranged to face the display unit 10. The display unit 10 has a plurality of pixels 13 arrayed in a first direction d1, and in a second direction d2 non-parallel to the first direction d1. The decorative sheet 20 includes: a plurality of design parts 23 forming a design; and a plurality of transmission parts 27 that are non-forming parts of the design parts 23. The plurality of design parts 23 are arrayed in a third direction d3 non-parallel to both the first direction d1 and the second direction d2, and extend linearly in a fourth direction d4 non-parallel to the third direction d3. A proportion of the area occupied by the transmission parts 27 in the decorative sheet 20 is 15% or more and 50% or less. An average of array pitches of the design parts 23 along the third direction d3 is 90% or less of an array pitch of the pixels 13 along the first direction d1 and the second direction d2. The smaller angle out of angles formed by the first direction d1 and the third direction d3, is 5° or more and 85°or less.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a display device with a decorative sheet. [Background technology]

[0002] Display devices that display images are widely used. When no image is displayed, such display devices are usually observed to be black. On the other hand, design is considered to be extremely important for surface components of automobiles, furniture, housing construction materials, and the like. Currently, display devices applied to such fields are expected not only to simply display images, but also to have a design that blends in with the surrounding environment.

[0003] In order to impart design features to display devices, decorative sheets have been proposed, as shown in Patent Document 1, for example. The decorative sheet is provided in a position facing the display surface of the display device. The decorative sheet has a design portion that forms a design. When the decorative sheet is provided in a position facing the display surface of the display device, the surface of the decorative sheet becomes the surface of the display device with the decorative sheet. The decorative sheet displays the design created by the design portion on its surface. This gives the display device with the decorative sheet design. The imparted design allows the display device with the decorative sheet to blend in with the surrounding environment. Furthermore, the decorative sheet has a transparent portion that allows visible light to pass through, so that image light from the display device can pass through the decorative sheet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-331132 Summary of the Invention [Problem to be solved by the invention]

[0005] In a display device with a decorative sheet as shown in Patent Document 1, a striped pattern may be observed in the image displayed by the display device. The inventors of the present invention have found that the striped pattern is a moire (interference pattern) that occurs due to the regular arrangement of the transmissive portions provided on the decorative sheet and the regular arrangement of the pixels of the display device. Such a moire pattern deteriorates the visibility of the image displayed on the display device. Therefore, it is desirable to suppress the occurrence of the moire pattern.

[0006] The present invention has been made in consideration of the above points, and has as its object to suppress the occurrence of moire. [Means for solving the problem]

[0007] The display device with a decorative sheet of the present invention comprises: a display device having a plurality of pixels arranged in a first direction and a second direction non-parallel to the first direction; a decorative sheet disposed facing the display device, The decorative sheet has a plurality of design portions that form a design and a plurality of transparent portions that are non-formation portions of the design portions, the plurality of design portions are arranged in a third direction non-parallel to both the first direction and the second direction and extend linearly in a fourth direction non-parallel to the third direction; The ratio of the area occupied by the transmission portion in the decorative sheet is 15% or more and 50% or less, an average arrangement pitch of the design portions along the third direction is 90% or less of an arrangement pitch of the pixels along the first direction and the second direction; The smaller of the angles formed by the first direction and the third direction is equal to or greater than 5° and equal to or less than 85°.

[0008] In the display device with a decorative sheet of the present invention, the pixels are rectangular; The smallest angle between the diagonal direction of the pixel and the third direction may be equal to or greater than 10° and equal to or less than 35°.

[0009] In the display device with a decorative sheet of the present invention, the length of the design portion along the third direction may be 10 μm or more and 150 μm or less.

[0010] In the display device with a decorative sheet of the present invention, a length of the transmission portion along the third direction different from a length of at least one other transmission portion along the third direction; a maximum length of the transmission portion along the third direction is 150% or less of an average length of the transmission portion along the third direction, The minimum length of the transmissive portion along the third direction may be 50% or less of the average length of the transmissive portion along the third direction.

[0011] In the display device with a decorative sheet of the present invention, the length of the design portion along the third direction is different from the length of at least one other design portion along the third direction; the maximum length of the design portion along the third direction is 150% or less of the average length of the design portion along the third direction; The minimum length of the design portion along the third direction may be 50% or less of the average length of the design portion along the third direction.

[0012] In the display device with a decorative sheet of the present invention, the viewing angle of the image displayed on the display device in the third direction may be smaller than the viewing angle in the fourth direction. [Effects of the Invention]

[0013] According to the present invention, it is possible to suppress the occurrence of moire. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an exploded perspective view that schematically shows a display device with a decorative sheet. [Figure 2] FIG. 2 is a cross-sectional view of a display device with a decorative sheet. [Figure 3] FIG. 3 is an enlarged front view of a part of the display device. [Figure 4] FIG. 4 is an enlarged front view of a part of the decorative sheet. [Figure 5] FIG. 5 is an enlarged front view showing a part of the display device with a decorative sheet. [Figure 6] FIG. 6 is a further enlarged front view showing a part of the display device with the decorative sheet. [Figure 7] FIG. 7 is a perspective view for explaining the viewing angle of a display device with a decorative sheet. [Figure 8] FIG. 8 is a front view of the display device with a decorative sheet, showing a state in which the display device is not displaying an image. [Figure 9] FIG. 9 is a front view of the display device with a decorative sheet, showing a state in which the display device is displaying an image. [Figure 10] FIG. 10 is an enlarged front view of a part of a display device with a decorative sheet, showing a modified example of the decorative sheet. [Figure 11] FIG. 11 is an enlarged front view of a part of a display device with a decorative sheet, showing another modified example of the decorative sheet. DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present invention will now be described with reference to the drawings. In the drawings accompanying this specification, the scale and aspect ratios have been appropriately changed and exaggerated from those of the actual objects for the sake of ease of illustration and understanding.

[0016] In addition, in this specification, the terms "layer," "sheet," and "film" are not distinguished from one another solely based on differences in name. For example, the term "sheet" is a concept that includes a member that can be called a layer or a film.

[0017] Furthermore, terms used in this specification that specify shapes, geometric conditions, and their degrees, such as "parallel," "orthogonal," and "identical," as well as values ​​of lengths and angles, are intended to be interpreted without being bound by strict meanings, but to include a range within which similar functions can be expected.

[0018] FIG. 1 is an exploded perspective view schematically illustrating a display device 1 with a decorative sheet according to an embodiment of the present invention. As shown in FIG. 1, the display device 1 with a decorative sheet includes a display device 10 and a decorative sheet 20. The display device 10 has a display surface 11 that displays an image. The decorative sheet 20 is disposed facing the display surface 11 of the display device 10. FIG. 2 also illustrates a cross-sectional view of the display device 1 with a decorative sheet. As shown in FIG. 2, in the display device 1 with a decorative sheet, the decorative sheet 20 is disposed such that the side on which a light-shielding portion 25 is provided faces the display device 10 relative to a design portion 23 (described later). Note that, although the display device 1 with a decorative sheet is shown as a flat plate in the illustrated example, the display device 1 with a decorative sheet may be curved by curving each component of the display device 1 with a decorative sheet. For example, only the decorative sheet 20 may be curved, or both the display surface 11 of the display device 10 and the decorative sheet 20 may be curved.

[0019] The display device 1 with a decorative sheet can be in an image non-display state and an image display state. In the image non-display state, the display device 1 with a decorative sheet can display a design formed by the decorative sheet 20. In the image display state, the display device 1 with a decorative sheet can display an image displayed by the display device 10. Each component of the display device 1 with a decorative sheet will be described below.

[0020] First, the display device 10 will be described. The display device 10 can display an image on a display surface 11. The display device 10 can emit image light from the display surface 11. Any display device, such as a liquid crystal display, a plasma display, or an organic EL display, can be used as the display device 10. The display surface 11 of such a display device 10 is typically a glass surface. The display surface 11 extends in a first direction d1 and a second direction d2 non-parallel to the first direction d1. In the illustrated example, the first direction d1 and the second direction d2 are perpendicular to each other. The display device 10 also has a plurality of pixels 13 regularly arranged along the first direction d1 and the second direction d2 on the display surface 11. In other words, the plurality of pixels 13 are regularly arranged two-dimensionally. That is, the display device 10 is a so-called dot matrix display.

[0021] 3 is an enlarged front view of a portion of the display device 10. As shown in FIG. 3, the display device 10 has a black matrix 15 provided between adjacent pixels 13. The black matrix 15 is arranged in a lattice pattern along the first direction d1 and the second direction d2. In particular, in the illustrated example, the black matrix 15 is arranged in a square lattice pattern. The pixels 13 are arranged in the gaps formed by the black matrix 15.

[0022] The pixels 13 emit light to form images displayed by the display device 10. In the illustrated example, the pixels 13 include a first sub-pixel 13R, a second sub-pixel 13G, and a third sub-pixel 13B that emit different colors. Typically, the first sub-pixel 13R emits red light, the second sub-pixel 13G emits green light, and the third sub-pixel 13B emits blue light. In this case, the pixels 13 can emit light in any visible color, i.e., full color. With such pixels 13, the display device 10 can display full-color images.

[0023] As shown in FIG. 3 , the pixels 13 are arranged at a constant pitch p1 along the first direction d1 and at a constant pitch p2 along the second direction d2. The first sub-pixels 13R, second sub-pixels 13G, and third sub-pixels 13B are also arranged at a constant pitch p1 along the first direction d1 and at a constant pitch p2 along the second direction d2. In the illustrated example, the arrangement pitch p1 of the pixels 13 along the first direction d1 is the same length as the arrangement pitch p2 along the second direction d2. The arrangement pitch p1 of the pixels 13 along the first direction d1 and the arrangement pitch p2 along the second direction d2 are, for example, 50 μm or more and 500 μm or less. In the pixel 13, the first sub-pixels 13R, second sub-pixels 13G, and third sub-pixels 13B are arranged side by side along the second direction d2. 3, the first sub-pixel 13R, the second sub-pixel 13G, and the third sub-pixel 13B are each a rectangle that is longer in the first direction d1 than in the second direction d2, and the pixel 13 is a rectangle, particularly a square. The length of one side of the pixel 13 is, for example, not less than 50 μm and not more than 500 μm.

[0024] Next, the decorative sheet 20 will be described. The decorative sheet 20 is disposed facing the display surface 11 of the display device 10, and covers at least the entire display surface 11 so that the display surface 11 cannot be directly observed from the outside. The dimensions of the decorative sheet 20 in the first direction d1 and the second direction d2 are equal to or greater than the dimensions of the display surface 11 so that it can cover the entire display surface 11 of the display device 10. In the example shown in FIG. 1, the decorative sheet 20 is a flat member that extends as a whole in the same direction as the display surface 11 of the display device 10. The thickness of the decorative sheet 20 is, for example, 20 μm or more and 550 μm or less.

[0025] The decorative sheet 20 displays a design and imparts design to the display device 1 with the decorative sheet. As shown in FIG. 2, the decorative sheet 20 has a base portion 21, a plurality of design portions 23, a light-shielding portion 25, and a light-transmitting portion 27. The design portions 23 are laminated on the base portion 21. The light-shielding portion 25 is laminated on the design portions 23. The light-transmitting portion 27 is a portion where the design portions 23 and the light-shielding portion 25 are not formed. Note that, not limited to the example shown in the figure, the light-shielding portion 25 may be omitted.

[0026] The substrate 21 appropriately supports the design portion 23 and the light-shielding portion 25. The substrate 21 is a transparent film-like member. Any material may be used for the substrate 21 as long as it is transparent and can appropriately support the design portion 23 and the light-shielding portion 25. Examples of such materials include polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, cyclic polyolefin, and ABS (acrylonitrile butadiene styrene copolymer). In addition, in consideration of transparency and appropriate support for the design portion 23 and the light-shielding portion 25, the substrate 21 preferably has a thickness of 10 μm or more and 500 μm or less.

[0027] Here, "transparent" means that the visible light transmittance, specified as the average value of the transmittance at each wavelength, is 80% or more when measured using a spectrophotometer (Shimadzu Corporation's "UV-3100PC," compliant with JIS K 0115) within the measurement wavelength range of 380 nm to 780 nm.

[0028] The design portion 23 forms the design displayed by the decorative sheet 20. More specifically, one design is formed by a plurality of design portions 23. The design portion 23 can form a design such as a figure, pattern, design, color, picture, photograph, character, mark, pictogram, letter, or number. For example, the design portion 23 may form a wood-grain or marble-like design or a geometric pattern as a design that can harmonize with the surrounding environment in which the display device 1 with the decorative sheet is installed.

[0029] The thickness of the design portion 23 is preferably 1 μm or more and 20 μm or less. By making the design portion 23 sufficiently thick, the pattern formed by the design portion 23 can be made thick and clear. Here, the thickness of the design portion 23 refers to the length of the design portion 23 along the normal direction of the base portion 21 that supports the design portion 23. Note that in a cross section perpendicular to the sheet surface of the decorative sheet 20 as shown in FIG. 2, the cross-sectional shape of the design portion 23 is rectangular, but it is not limited to this and may be trapezoidal, for example.

[0030] FIG. 4 shows an enlarged front view of a portion of the decorative sheet 20. As shown in FIG. 4, the multiple design portions 23 are arranged in the third direction d3 and extend linearly, particularly straight, in the fourth direction d4. The third direction d3 and the fourth direction d4 are in the same plane as the first direction d1 and the second direction d2 and are non-parallel to the first direction d1 and the second direction d2. Preferably, the third direction d3 and the fourth direction d4 are perpendicular to each other. Furthermore, the first direction d1 and the third direction d3 are not perpendicular to each other. Specifically, the smaller of the angles θ formed by the first direction d1 and the third direction d3 is 5° or more and 85° or less, preferably 15° or more and 35° or less, or 55° or more and 80° or less, and more preferably 15° or more and 35° or less.

[0031] The design portions 23 are arranged at an arrangement pitch p3 along the third direction d3. The arrangement pitch p3 of the design portions 23 along the third direction d3 is, for example, 15 μm or more and 250 μm or less. In the example shown in FIG. 4, the arrangement pitch p3 of the design portions 23 along the third direction d3 is constant. Furthermore, the width of each design portion 23, in other words, the length w1 of the design portion 23 along the third direction d3, is preferably 10 μm or more and 150 μm or less, and more preferably 40 μm or more and 100 μm or less. In the example shown in FIG. 4, the length w1 of the design portion 23 along the third direction d3 is constant.

[0032] The light-shielding portion 25 is provided to cover the design portion 23 from the side facing the display device 10. The light-shielding portion 25 has a light-absorbing function to prevent image light from the display device 10 from entering the design portion 23. The light-shielding portion 25 may contain, for example, light-absorbing particles in a binder resin. Examples of light-absorbing particles include black pigments such as carbon black and titanium black. Preferably, the light-shielding portion 25 is provided only in a position facing the design portion 23 so that the light-shielding portion 25 does not prevent the image light emitted from the display device 10 from passing through the transmission portion 27. Furthermore, if the light-shielding portion 25 is sufficiently thick to cover the design portion 23, the image formed by the design portion 23 can be made dark and clear. As a specific example, the thickness of the light-shielding portion 25 is 1 μm or more and 20 μm or less.

[0033] The transmissive portions 27 are provided to transmit image light from the display device 10 to the decorative sheet 20. As shown in FIGS. 2 and 4, the transmissive portions 27 are portions where the design portions 23 and the light-shielding portions 25 are not formed when the decorative sheet 20 is observed from the front. In order to sufficiently transmit the image light from the display device 10, the proportion of the area occupied by the transmissive portions 27 in the decorative sheet 20 (also referred to as the aperture ratio) is 15% or more, preferably 20% or more, and more preferably 25% or more. On the other hand, in order to make the design displayed by the decorative sheet 20 easier to observe, the area occupied by the transmissive portions 27 in the decorative sheet 20 is 50% or less, preferably 40% or less, and more preferably 30% or less.

[0034] The transmissive portions 27 are non-forming portions of the design portion 23 and the light-shielding portion 25, and are therefore arranged in the third direction d3 and extend in the fourth direction d4, as shown in FIG. 4 . Because the design portion 23 is arranged at an arrangement pitch p3 along the third direction d3, the transmissive portions 27 are also arranged at an arrangement pitch p3 along the third direction d3. Because the design portion 23 extends linearly in the fourth direction d4, the transmissive portions 27 also extend linearly in the fourth direction d4. In the example shown in FIG. 4 , the length w2 of each transmissive portion 27 along the third direction d3, in other words, the width of each transmissive portion 27, is constant along the fourth direction d4. The length w2 of each transmissive portion 27 along the third direction d3 is, for example, not less than 5 μm and not more than 120 μm. The length w2 of each transmissive portion 27 along the third direction d3 is preferably shorter than the length w1 of the design portion 23 along the third direction d3.

[0035] The transmissive portion 27 may be an air gap, as in the example shown in FIG. 2, or may be formed of, for example, a transparent resin. Such a transparent resin can effectively prevent foreign matter such as dust from entering the transmissive portion 27. Furthermore, the transparent resin may be formed so as to cover not only the transmissive portion 27 but also the design portion 23 and the light-shielding portion 25 from the side opposite to the side on which the base portion 21 is provided. Such a transparent resin can form the transmissive portion 27 and also function as a transparent protective film that protects the design portion 23 and the light-shielding portion 25.

[0036] The transparent portions 27 are provided, for example, by irradiating the design portions 23 and light-shielding portions 25 provided on the entire surface of the base material 21 with a laser at positions where the transparent portions 27 should be formed, and removing the design portions 23 and light-shielding portions 25 at the positions irradiated with the laser. Alternatively, the transparent portions 27 may be provided as areas where the design portions 23 and light-shielding portions 25 are not formed by forming the design portions 23 and light-shielding portions 25 on the base material 21 in a predetermined pattern as shown in Fig. 4 by printing or the like.

[0037] FIG. 5 is an enlarged front view of a portion of the display device 1 with a decorative sheet. As shown in FIG. 5, the arrangement pitch p3 of the design portions 23 along the third direction d3 is smaller than the arrangement pitches p1 and p2 of the pixels 13 along the first direction d1 and the second direction d2. Specifically, the average arrangement pitch p3 of the design portions 23 along the third direction d3 is 90% or less, and preferably 70% or less, of the arrangement pitches p1 and p2 of the pixels 13 along the first direction d1 and the second direction d2. Here, the average arrangement pitch p3 of the design portions 23 along the third direction d3 can be defined as the average arrangement pitch p3 of the design portions 23 along the third direction d3 for the design portion 23 at a certain position on the decorative sheet 20 and the 20 design portions 23 adjacent to that design portion 23 in the third direction d3.

[0038] FIG. 6 is a front view showing a further enlarged portion of the display device 1 with a decorative sheet. FIG. 6 shows an enlarged view of the display device 1 with a decorative sheet at a position corresponding to one pixel 13. In the example shown, the pixel 13 is rectangular, particularly a square. It is preferable that the directions of the two diagonals of the rectangle of the pixel 13 and the third direction d3 are non-parallel. In particular, it is preferable that the smallest angle of the angles α and β formed between the diagonal directions of the pixel 13 and the third direction d3 is between 10° and 35°.

[0039] FIG. 7 is a diagram showing the viewing angles of an image of the display device 1 with a decorative sheet in the third direction d3 and the fourth direction d4. As described above, the image light of the display device 10 passes through the transmissive portions 27 of the decorative sheet 20. The transmissive portions 27 are arranged in the third direction d3 and extend linearly in the fourth direction d4. Therefore, the image light transmitted through the decorative sheet 20 is observed only in a relatively narrow range in the third direction d3, but in a relatively wide range in the fourth direction d4. In other words, the viewing angle A3 of the image displayed on the display device 10 in the third direction d3 is smaller than the viewing angle A4 in the fourth direction d4.

[0040] Next, the operation of the display device 1 with the decorative sheet of this embodiment will be described.

[0041] When no image is displayed on the display surface 11 of the display device 10, the display device 1 with decorative sheet displays a design formed by the design portion 23 of the decorative sheet 20, as shown in FIG. 8. That is, the display device 1 with decorative sheet can display a design that is intended to be observed. The displayed design prevents the display surface 11 of the display device 10 from being observed by an external observer, allowing the display device 1 with decorative sheet to blend in with the surrounding environment in terms of design. In particular, when the shading portion 25 is provided only in a position facing the design portion 23, the shading portion 25 cannot be observed by an observer, and the shading portion 25 can be prevented from impairing the design of the decorative sheet 20.

[0042] On the other hand, when the display device 10 displays an image on the display surface 11, the image light passes through the base material 21 and the transmissive portion 27 of the decorative sheet 20, as shown in Fig. 9. This allows the observer to observe the image displayed on the display surface 11. In other words, the display device 1 with the decorative sheet can display the image that is intended to be observed, and an external observer can observe the image.

[0043] Furthermore, the design portion 23 is covered from the side of the display device 10 by the light-shielding portion 25. Therefore, the light-shielding portion 25 prevents image light from entering the design portion 23. This prevents the image light from passing through the design portion 23 and the design represented by the design portion 23 from being mixed with the image light and observed. In other words, it is possible to effectively prevent degradation of the color reproducibility of the image caused by the absorption of visible light in a specific wavelength range by the design portion 23. Furthermore, when the light-shielding portion 25 is provided only in the area facing the design portion 23, the light-shielding portion 25 prevents the image light from being blocked from passing through the transmission portion 27. In other words, the image light can be efficiently used to display a bright image.

[0044] As described above, moire patterns may be observed in conventional display devices with decorative sheets when the display device displays an image. Moire patterns are generated by the regular arrangement of pixels in the display device and the regular arrangement of transmissive portions in the decorative sheet. More specifically, image light emitted from the regularly arranged pixels contains periodicity due to the pixel arrangement. Furthermore, the image light passes through the regularly arranged transmissive portions and is emitted from the decorative sheet, incorporating the periodicity of the transmissive portions. That is, the image light emitted from the decorative sheet contains periodicity due to the pixel arrangement and periodicity due to the transmissive portion arrangement. These two periodicities interfere with each other, causing moire patterns (interference fringes) in the observed image. Such moire patterns deteriorate the visibility of images displayed on the display device, and therefore it is desirable to suppress the occurrence of moire patterns.

[0045] In order to suppress the occurrence of moire, it is believed that it is effective to shift the directions in which the two elements that cause interference exhibit regularity. In the display device 1 with a decorative sheet of this embodiment, the smaller angle θ between the first direction d1 in which the pixels 13 are arranged and the third direction d3 in which the design portions 23 are arranged is 5° or more and 85° or less. Therefore, according to the display device 1 with a decorative sheet of this embodiment, it is possible to effectively suppress the occurrence of moire caused by interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmissive portions 27 arranged in the third direction d3.

[0046] Additionally, shifting the arrangement pitches of two elements that cause interference is also considered effective in suppressing moiré. In the display device 1 with a decorative sheet according to this embodiment, the average arrangement pitch p3 of the design portions 23 along the third direction d3 is 90% or less of the arrangement pitches p1 and p2 of the pixels along the first direction d1 and the second direction d2. The transparent portions 27, which are non-formation portions of the design portions 23, are arranged at the arrangement pitch p3. Therefore, the display device 1 with a decorative sheet according to this embodiment can effectively suppress moiré caused by interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transparent portions 27 arranged in the third direction d3. Additionally, with this display device 1 with a decorative sheet, each pixel 13 is likely to overlap with one of the transparent portions 27, making it easier for image light emitted from each pixel 13 to pass through one of the transparent portions 27 to form an image. In other words, the occurrence of a pixel 13 being completely covered by the design portion 23 can be effectively suppressed.

[0047] Furthermore, in the display device 1 with a decorative sheet of this embodiment, the area ratio of the transparent portions 27 in the decorative sheet 20 is 15% or more and 50% or less. Because the area ratio of the transparent portions 27 in the decorative sheet 20 is sufficiently large, the image light emitted from the display device 10 can be sufficiently transmitted through the decorative sheet 20. This allows the image displayed on the display device 10 to be clearly observed. Furthermore, because the area ratio of the transparent portions 27 in the decorative sheet 20 is sufficiently small, the area ratio of the design portion 23 can be sufficiently large. This allows the design formed by the design portion 23 to be clearly observed even when no image is displayed.

[0048] In this embodiment, each pixel 13 is rectangular, and the smallest of the angles α and β formed between the diagonal direction of the pixel 13 and the third direction d3 is 10° or more and 35° or less. When each pixel 13 is rectangular, the pixels 13 are regularly arranged not only in the first direction d1 and the second direction d2 but also in the diagonal direction of the pixels 13. Therefore, moiré may occur due to the periodicity of the arrangement of the pixels 13 in the diagonal direction of the pixels 13 and the periodicity of the arrangement of the transmissive portions 27. When the smallest of the angles α and β formed between the diagonal direction of the pixels 13 and the third direction d3, which is the arrangement direction of the transmissive portions 27, is 10° or more and 35° or less, the directions in which the two elements that cause interference exhibit regularity are inclined relative to each other. Therefore, it is possible to effectively suppress the occurrence of moiré caused by interference between the regularity of the pixels 13 arranged in the diagonal direction of the pixels 13 and the regularity of the transmissive portions 27 arranged in the third direction d3.

[0049] In this embodiment, the length w1 of the design portion 23 along the third direction d3, i.e., the width of the design portion 23, is 10 μm or more and 150 μm or less. If the width of the design portion 23 is too large, one design portion 23 is likely to overlap the entirety of one of the pixels 13. In this case, the image light from that pixel 13 will not pass through the decorative sheet 20, and part of the image will not be visible. On the other hand, if the width of the design portion 23 is too small, the image light passing through the decorative sheet 20 will be easily diffracted, resulting in interference fringes due to diffraction being observed in the image. By setting the width of the design portion 23 to 10 μm or more and 150 μm or less, it is possible to effectively prevent part of the image from being hidden and to suppress diffraction of the image light passing through the decorative sheet 20. This prevents deterioration of image visibility.

[0050] In this embodiment, the viewing angle A3 of the image displayed on the display device 10 in the third direction d3 is smaller than the viewing angle A4 in the fourth direction d4. In other words, the image displayed on the display device 1 with the decorative sheet is less easily observed from a direction tilted in the fourth direction d4 than from a direction tilted in the third direction d3. When placed inside a car, for example, such a display device 1 with the decorative sheet can be easily observed from the passenger seat of the car but less easily observed from the driver's seat. Furthermore, when such a display device 1 with the decorative sheet is used for security purposes, the image displayed on the display device with the decorative sheet can be easily observed from the front while being prevented from being viewed from the side.

[0051] As described above, the display device 1 with a decorative sheet of this embodiment includes the display device 10 having a plurality of pixels 13 arranged in the first direction d1 and the second direction d2 non-parallel to the first direction d1, and the decorative sheet 20 arranged facing the display device 10. The decorative sheet 20 has a plurality of design portions 23 that form a design and a plurality of transmissive portions 27 that are non-formation portions of the design portions 23. The plurality of design portions 23 are arranged in the first direction d1 and the second direction d2 non-parallel to both the first direction d1 and the second direction d2. The decorative portions 23 are arranged in three directions d3 and extend linearly in a fourth direction d4 non-parallel to the third direction d3, the proportion of the area occupied by the transmissive portions 27 in the decorative sheet 20 is 15% or more and 50% or less, the average arrangement pitch p3 of the decorative portions 23 along the third direction d3 is 90% or less of the arrangement pitches p1, p2 of the pixels 13 along the first direction d1 and the second direction d2, and the smaller angle θ between the first direction d1 and the third direction d3 is 5° or more and 85° or less. In such a display device 1 with a decorative sheet, the directions and arrangement pitches in which the two elements that cause interference exhibit regularity are shifted, so that it is possible to effectively suppress the occurrence of moire caused by interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmissive portions 27 arranged in the third direction d3.

[0052] The display device 1 with the decorative sheet described above is used in the interior or exterior components of moving objects such as automobiles, trains, airplanes, ships, and spacecraft. Specific application examples of the display device 1 with the decorative sheet include use in the center console or door trim of an automobile. Alternatively, the display device 1 with the decorative sheet may be incorporated into the interior or exterior components of a building, electronic equipment, furniture, or electrical appliances.

[0053] It should be noted that various modifications can be made to the above-described embodiment.

[0054] FIG. 10 shows an enlarged front view of a portion of a modified example of the display device 1 with a decorative sheet. In the modified example shown in FIG. 10, the length w1 of the design portion 23 along the third direction d3, i.e., the width of the design portion 23, is constant. However, the length w2 of each transmissive portion 27 along the third direction d3 is different from the length of at least one other transmissive portion 27 along the third direction d3. Therefore, the arrangement pitch p3 of the design portions 23 along the third direction d3 is not constant throughout the decorative sheet 20 but varies at least partially. In particular, it is preferable that the length w2 of each transmissive portion 27 along the third direction d3 varies irregularly among the transmissive portions 27. The variations in the length w2 of each transmissive portion 27 along the third direction d3 and the arrangement pitch p3 of the design portions 23 along the third direction d3 weaken the regularity of the image light passing through the transmissive portions 27. Therefore, it is possible to effectively suppress the occurrence of moire caused by interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmissive portions 27 arranged in the third direction d3.

[0055] In this modified example, it is preferable that the variation in the length w2 of the transmissive portion 27 along the third direction d3 is not too large. Specifically, the maximum length w2 of the transmissive portion 27 along the third direction d3 is preferably 150% or less, more preferably 120% or less, of the average length w2 of the transmissive portion 27 along the third direction d3. Furthermore, the minimum length w2 of the transmissive portion 27 along the third direction d3 is preferably 50% or less, more preferably 20% or less, of the average length w2 of the transmissive portion 27 along the third direction d3. Here, the average length w2 of the transmissive portion 27 along the third direction d3 can be defined as the average length w2 of the transmissive portion 27 along the third direction d3 for 20 transmissive portions 27 continuing from the transmissive portion 27 at a certain position on the decorative sheet 20 in the third direction d3.

[0056] The variation in the lengths w2 of the transmissive portions 27 along the third direction d3 is not too large, which reduces the variation in the image light transmitted through each transmissive portion 27 when the display device 10 displays an image, thereby effectively preventing unevenness from occurring in the observed image.

[0057] FIG. 11 shows an enlarged front view of a portion of another modified example of the display device 1 with a decorative sheet. In the modified example shown in FIG. 11, the arrangement pitch p3 of the design portions 23 along the third direction d3 is constant, but the length w1 of the design portions 23 along the third direction d3, i.e., the width of the design portions 23, is different from the length of at least one other design portion 23 along the third direction d3. Therefore, the length w2 of the transmissive portions 27 along the third direction d3 is not constant throughout the entire decorative sheet 20 but varies at least partially. In particular, it is preferable that the length w1 of the design portions 23 along the third direction d3 varies irregularly for each design portion 23. The variation in the length w1 of the design portions 23 along the third direction d3 causes the length w2 of the transmissive portions 27 along the third direction d3 to vary, weakening the regularity of the image light passing through the transmissive portions 27. Therefore, it is possible to effectively suppress the occurrence of moire caused by interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmissive portions 27 arranged in the third direction d3.

[0058] In this modification, it is preferable that the variation in the length w1 of the design portion 23 along the third direction d3 is not too large. Specifically, the maximum length w1 of the design portion 23 along the third direction d3 is preferably 150% or less, more preferably 120% or less, of the average length w1 of the design portion 23 along the third direction d3. Furthermore, the minimum length w1 of the design portion 23 along the third direction d3 is preferably 50% or less, more preferably 20% or less, of the average length w1 of the design portion 23 along the third direction d3. Here, the average length w1 of the design portion 23 along the third direction d3 can be defined as the average length w1 of the design portion 23 along the third direction d3 for 20 design portions 23 consecutive in the third direction d3 from the design portion 23 at a certain position on the decorative sheet 20.

[0059] By preventing excessive variation in the length w1 of the design portion 23 along the third direction d3, it is possible to reduce variation in the color density of the design formed by the design portion 23 when the display device 10 is not displaying an image, thereby effectively preventing color unevenness from occurring in the observed design.

[0060] 10 and 11 may be combined. That is, the length w1 of the design portion 23 along the third direction d3, the length w2 of the transmissive portion 27 along the third direction d3, and the arrangement pitch p3 of the design portion 23 along the third direction d3 may all vary throughout the entire decorative sheet 20. Alternatively, the length w2 of the transmissive portion 27 along the third direction d3 may be constant, and the length w1 of the design portion 23 along the third direction d3 and the arrangement pitch p3 of the design portion 23 along the third direction d3 may vary throughout the entire decorative sheet 20.

[0061] The present invention will be described in more detail below using examples, but the present invention is not limited to the following examples.

[0062] As examples and comparative examples, display devices with decorative sheets were prepared, each with a different pixel arrangement pitch p1 along the first direction d1, the ratio of the area occupied by the transmissive portions in the decorative sheet (aperture ratio), the average arrangement pitch p3 of the design portions along the third direction d3, and the length w2 of the transmissive portions along the third direction d3. The ratio of the average arrangement pitch p3 of the design portions along the third direction d3 to the pixel arrangement pitch p1 along the first direction d1 was calculated. The angle θ between the first direction d1 and the third direction d3 was set to 15°. The pixels were square, and the pixel arrangement pitch p1 along the first direction d1 was equal to the pixel arrangement pitch p2 along the second direction d2.

[0063] For each example and comparative example, the moire when the image was displayed and the visibility of the displayed image were evaluated visually. Regarding the evaluation of moire, when no moire was observed visually, it was evaluated as A, when only moire was observed to a degree that did not affect the visibility of the image, it was evaluated as B, when moire that affected the visibility of the image was observed, it was evaluated as C, and when moire was clearly observed, it was evaluated as D. Regarding the visibility of the image, when the image was observed very clearly, it was evaluated as A, when the image was observed clearly, it was evaluated as B, when the image was observed only unclearly, it was evaluated as C, and when the image was observed very unclearly, it was evaluated as D.

[0064] For each example and comparative example, the pitch p1 of the pixel arrangement along the first direction d1, the proportion of the area occupied by the transparent portion in the decorative sheet (aperture ratio), the average arrangement pitch p3 of the design portion along the third direction d3, the length w2 of the transparent portion along the third direction d3, the proportion of the average arrangement pitch p3 of the design portion along the third direction d3 to the pitch p1 of the pixel arrangement along the first direction d1, and the results of evaluation of moire when the image is displayed and the visibility of the displayed image are shown in Table 1 below.

[0065] [Table 1]

[0066] A comparison of each example and each comparative example in Table 1 shows that by setting the average arrangement pitch p3 of the design portions along the third direction d3 to 90% or less of the arrangement pitch p1 of the pixels along the first direction d1, it is possible to effectively suppress the occurrence of moire caused by interference between the regularity of the pixels arranged in the first direction d1 and the regularity of the transmissive portions arranged in the third direction d3. In particular, a comparison of example 1 and comparative example 5 shows that the occurrence of moire can be effectively suppressed not by the arrangement pitch p3 of the design portions in the decorative sheet, but by the relationship between the arrangement pitch p3 of the design portions and the arrangement pitch p1 of the pixels.

[0067] Furthermore, when the difference between the arrangement pitch p3 of the design portions in the third direction d3 and the length of the transparent portions, i.e., the length of the design portions in the third direction d3, was 160 μm or more, the image was only observed unclearly. This is thought to be because a wide design portion overlapped the entirety of one of the pixels, making it easier for the image light from that pixel to not be transmitted through the decorative sheet, and therefore making it impossible to observe part of the image. [Explanation of symbols]

[0068] 1 Display device with decorative sheet 10 Display device 11 Display surface 13 pixels 13R 1st sub-pixel 13G 2nd sub-pixel 13B 3rd sub-pixel 15 Black Matrix 20 Decorative sheet 21 Base material part 23 Design Department 25 Light blocking section 27 Transparent part

Claims

[Claim 1] a display device having a plurality of pixels arranged in a first direction and a second direction non-parallel to the first direction; a decorative sheet disposed facing the display device, The decorative sheet has a plurality of design portions that form a design and a plurality of transparent portions that are non-formation portions of the design portions, the plurality of design portions are arranged in a third direction non-parallel to both the first direction and the second direction and extend linearly in a fourth direction non-parallel to the third direction; the ratio of the area occupied by the transmission portion in the decorative sheet is 15% or more and 50% or less; an average arrangement pitch of the design portions along the third direction is 90% or less of an arrangement pitch of the pixels along the first direction and the second direction; The display device with a decorative sheet, wherein the smaller angle between the first direction and the third direction is equal to or greater than 5° and equal to or less than 85°.

Images