Display device with decorative sheet, and decorative sheet

Abstract

To provide a display device with a decorative sheet and a decorative sheet, capable of suppressing occurrence of moire.SOLUTION: A display device with a decorative sheet comprises a display device having a plurality of pixels arrayed in a first direction and a second direction non-parallel to the first direction, and a decorative sheet arranged so as to overlap with the display device.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a display device with a decorative sheet and a decorative sheet.

Background Art

[0002] Display devices for displaying images are widely used. In a state where no image is displayed, such a display device is usually observed as black. On the other hand, in surface members such as automobiles, furniture, and building materials for houses, design is highly regarded. Currently, for display devices applied particularly to such fields, not only a function of simply displaying an image on the display device is expected, but also design that harmonizes with the surrounding environment is required.

[0003] In order to impart design to a display device, for example, a decorative sheet as shown in Patent Document 1 has been proposed. The decorative sheet is provided at 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 at 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 by the design portion on the surface. Thereby, the display device with the decorative sheet is imparted with design. The display device with the decorative sheet can harmonize with the surrounding environment due to the imparted design. Further, in order for the image light of the display device to pass through the decorative sheet, the decorative sheet is provided with a transmission portion through which visible light can pass.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, 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. As a result of investigations by the inventors of the present invention, it has been found that the striped pattern is moiré (interference fringes) caused by the regular arrangement of the transmissive portions provided in the decorative sheet and the regular arrangement of the pixels of the display device. Such moiré deteriorates the visibility of the image displayed on the display device. Therefore, it is desirable to suppress the occurrence of moiré.

[0006] The present disclosure has been made in consideration of the above points, and an object thereof is to suppress the occurrence of moiré.

Means for Solving the Problems

[0007] Embodiments of the present disclosure relate to the following [1] to [7].

[0008] [1] A display device with a decorative sheet that displays a stereoscopic image visible to the naked eye, comprising: 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 on top of the display device. The decorative sheet has a plurality of design portions that form a design and a plurality of transmissive portions that are non-forming portions of the design portions. The transmissive portions are arranged in a third direction non-parallel to at least one of the first direction and the second direction, and linearly extend in a fourth direction non-parallel to the third direction. A display device with a decorative sheet.

[0009] [2] The display device with a decorative sheet according to [1], further comprising a lenticular lens layer disposed between the display device and the decorative sheet.

[0010] [3] The third direction is non-parallel to both the first direction and the second direction. The decorative sheet is the display device with a decorative sheet according to [1], which functions as a parallax barrier.

[0011] [4] The display device is the display device with a decorative sheet according to any one of [1] to [3], which is locally dimmable.

[0012] [5] The pitch of the transmissive portion is shorter than the pitch of the pixels in the first direction and the pitch of the pixels in the second direction, and is the display device with a decorative sheet according to any one of [1] to [4].

[0013] [6] The transmissive portion has a plurality of unit transmissive regions arranged along the fourth direction, The unit transmissive region includes a pair of side edges extending in the fourth direction, The pair of side edges are curved so as to be convex in a direction away from each other, and is the display device with a decorative sheet according to any one of [1] to [5].

[0014] [7] A decorative sheet, A plurality of design portions forming a design, and A plurality of transmissive portions which are non-forming portions of the design portion, The transmissive portions are arranged in a first arrangement direction and linearly extend in a second arrangement direction non-parallel to the first arrangement direction, The transmissive portions have a plurality of unit transmissive regions arranged along the second arrangement direction, The unit transmissive region includes a pair of side edges extending in the second arrangement direction, The pair of side edges are curved so as to be convex in a direction away from each other, and is a decorative sheet.

Advantages of the Invention

[0015] According to the embodiment of the present disclosure, the occurrence of moiré can be suppressed.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

[0017] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings attached to this specification, for the sake of convenience of illustration and easy understanding, the scale, the aspect ratio of the vertical and horizontal dimensions, etc. are appropriately changed and exaggerated from those of the actual object.

[0018] Terms used in this specification, such as terms specifying shapes, geometric conditions, and their degrees, for example, terms such as "parallel", "perpendicular", "identical", etc., and values of lengths and angles, etc., are not bound by strict meanings and are to be interpreted to include ranges to the extent that similar functions can be expected.

[0019] In this specification, terms such as "sheet", "film", and "plate" are not distinguished from each other only based on the difference in names. For example, a "decorative sheet" cannot be distinguished only by the difference in name from a member called a decorative film or a decorative plate.

[0020] The display device 1 with a decorative sheet according to this embodiment is a display device that can display a stereoscopic image visible to the naked eye. Also, the display device 1 with a decorative sheet according to this embodiment is a display device that can further display a planar image.

[0021] As shown in FIG. 1, the display device 1 with a decorative sheet includes a display device 10 and a decorative sheet 50 disposed on top of the display device 10. Further, the display device 1 with a decorative sheet may further include a lenticular lens layer 60 disposed between the display device 10 and the decorative sheet 50. Furthermore, the display device 10 may further include a light control layer 70 disposed between the decorative sheet 50 and the lenticular lens layer 60. In the example shown in FIG. 1, from the side closer to the display surface 11 of the display device 10, the lenticular lens layer 60, the light control layer 70, and the decorative sheet 50 are laminated in this order. Note that the display device 1 with a decorative sheet may include other components not shown. Also, in the illustrated example, the display device 1 with a decorative sheet is shown in a flat plate shape, but the display device 1 with a decorative sheet may have a curved shape due to the curvature of each component of the display device 1 with a decorative sheet.

[0022] The display device 1 with a decorative sheet can take an image non-display state and a display state. In the image non-display state, the display device 1 with a decorative sheet can display the design formed by the decorative sheet 50. In the image display state, the display device 1 with a decorative sheet can display the image displayed by the display device 10. Hereinafter, each component of the display device 1 with a decorative sheet will be described.

[0023] Here, first, the display device 10 will be described.

[0024] <Display Device> The display device 10 is a device that emits image light. This display device 10 has a display surface 11 that can emit image light. The display device 10 may be any display device such as a liquid crystal display, a plasma display, or an organic EL display. The display surface 11 of such a display device 10 is typically a glass surface. As shown in FIG. 1, the display surface 11 extends in a first direction d1 and a second direction d2 that is non-parallel to the first direction d1. In the illustrated example, the first direction d1 and the second direction d2 are orthogonal to each other. Also, as shown in FIG. 2, the display device 10 has a plurality of pixels 13 that are 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 two-dimensionally arranged. That is, the display device 10 is a so-called dot matrix display.

[0025] As shown in FIG. 2, the display device 10 further 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 the illustrated example, the black matrix 15 is arranged in a square lattice pattern. The above-described pixels 13 are arranged in the gaps formed by the black matrix 15.

[0026] The pixel 13 forms an image displayed by the display device 10 by emitting light. In the illustrated example, the pixel 13 includes a first sub-pixel 13r, a second sub-pixel 13g, and a third sub-pixel 13b that emit different colors from each other. The first sub-pixel 13r may be a pixel that emits red light, the second sub-pixel 13g may be a pixel that emits green light, and the third sub-pixel 13b may be a pixel that emits blue light. In this case, the pixel 13 can emit light in any visible color, that is, full color. According to such a pixel 13, the display device 10 can display a full-color image.

[0027] As shown in FIG. 2, the pixels 13 are arranged at a constant arrangement pitch p1 along the first direction d1 and at a constant arrangement pitch p2 along the second direction d2. The first sub-pixel 13r, the second sub-pixel 13g, and the third sub-pixel 13b are also arranged at a constant arrangement pitch p1 along the first direction d1 and at a constant arrangement 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 equal to 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 may be, for example, 50 μm or more and 500 μm or less. In a front view as shown in FIG. 2, 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. On the other hand, the pixel 13 is a rectangle, particularly a square. The length of one side of the pixel 13 may be, for example, 30 μm or more and 500 μm or less.

[0028] As shown in FIG. 7 described later, the pixel 13 includes a right-eye pixel 13R and a left-eye pixel 13L according to a plurality of positions assumed to be where the observer's left eye or right eye is located in order to observe the image three-dimensionally.

[0029] Note that the display device 10 may be a device that displays an image by transmitting light through a printed transparent film or the like, or may be a device that displays an image by light and dark by blocking part of the light with a light-shielding object. In this case, the display device 10 may have a light source that emits light and a predetermined pattern portion. The light source is preferably, for example, a surface light source device that emits light in a planar shape in order to make the intensity of the light transmitted through the predetermined pattern portion uniform. The predetermined pattern portion may be, for example, a transparent film printed corresponding to the image to be displayed. In this case, the surface of the transparent film becomes the display surface 11 of the display device 10. Also, the predetermined pattern portion may be a light-shielding object or the like having a shape corresponding to the image to be displayed. In this case, the non-formed portion such as the light-shielding object becomes the display surface 11.

[0030] In this embodiment, the image displayed on the display surface 11 of the display device 10 may be an image that can be visually recognized three-dimensionally by the lenticular lens layer 60. When the image is displayed with sufficient brightness, it becomes easier for the observer to recognize the image three-dimensionally. For this reason, on the display surface 11 of the display device 10, it is preferable that the image is displayed with sufficient brightness. Specifically, the brightness on the display surface 11 of the display device 10 is preferably 500 cd / m 2 or more, and more preferably 1000 cd / m 2 or more.

[0031] Such a display device 10 may be locally dimmable. That is, it may be configured such that the light emission of a plurality of light sources can be independently controlled according to the image displayed on the display device 10. Thereby, even when a plurality of light sources are regularly arranged at a predetermined pitch, the light emission of the light sources can be controlled irregularly. For this reason, the occurrence of moire can be suppressed. Further, since the display device 10 can be locally dimmed, the contrast of the image displayed on the display device 10 can be improved, and the power consumption of the display device 10 can be reduced. The control of the light emission of the plurality of light sources may be performed, for example, by a signal from a control unit (not shown).

[0032] Next, the decorative sheet 50 will be described.

[0033] <Decorative sheet> As shown in FIG. 1, the decorative sheet 50 is disposed on the display surface 11 side of the display device 10. By displaying a design, this decorative sheet 50 serves to impart a design property to the display device 1 with a decorative sheet. The decorative sheet 50 covers at least the entire display surface 11 so that the display surface 11 is not directly observed from the outside. Also, the decorative sheet 50 covers the entire lenticular lens layer 60 and light control layer 70 so that the lenticular lens layer 60 and light control layer 70 are not directly observed from the outside. For this reason, the decorative sheet 50 has dimensions equal to or larger than the dimensions of the display surface 11, lenticular lens layer 60, and light control layer 70 of the display device 10. In the example shown in FIG. 1, the decorative sheet 50 is a flat plate member that extends in the same direction as the display surface 11 of the display device 10 as a whole. The thickness of the decorative sheet 50 may be, for example, 20 μm or more and 550 μm or less.

[0034] As shown in FIGS. 3A and 3B, the decorative sheet 50 has a plurality of design portions 53 that form a design, and a plurality of transmission portions 57 that are non-formation portions of the design portions 53. Specifically, the decorative sheet 50 has a base material portion 51, a design portion 53 and a shielding portion 55 provided on the base material portion 51, and a transmission portion 57 that is a non-formation portion of the design portion 53 and the shielding portion 55. Note that the present invention is not limited to the illustrated example, and for example, the decorative sheet 50 may not have the shielding portion 55. Also, the decorative sheet 50 may further have a top coat layer (not shown) that covers the base material portion 51, the design portion 53, and the shielding portion 55.

[0035] In the example shown in FIG. 3A, the decorative sheet 50 is arranged such that the shielding portion 55 faces the display device 10. In the example shown in FIG. 3A, the design portion 53 is provided directly on the base material portion 51, and the shielding portion 55 is provided directly on the design portion 53. Specifically, the shielding portion 55, the design portion 53, and the base material portion 51 are arranged in this order from the side of the display device 10. However, it is not limited to this. As shown in FIG. 3B, the decorative sheet 50 may be arranged such that the base material portion 51 faces the display device 10. In the example shown in FIG. 3B, the shielding portion 55 is provided directly on the base material portion 51, and the design portion 53 is provided directly on the shielding portion 55. Specifically, the base material portion 51, the shielding portion 55, and the design portion 53 are arranged in this order from the side of the display device 10. In FIG. 3B, a hard coat layer (top coat layer (not shown)) may be formed so as to cover the shielding portion 55 and the design portion 53.

[0036] The base material portion 51 of the decorative sheet 50 is a member for appropriately supporting the design portion 53 and the shielding portion 55 provided on the base material portion 51. This base material portion 51 is a transparent film-like member. As the material of the base material portion 51, any material may be used as long as it can transmit visible light and can appropriately support the design portion 53 and the shielding portion 55. Examples of the material constituting the base material portion 51 include polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polystyrene, cyclic polyolefin, ABS (acrylonitrile butadiene styrene copolymer), and the like. Also, considering the visible light transmittance and the strength for supporting the design portion 53 and the shielding portion 55, the thickness of the base material portion 51 may be, for example, 10 μm or more and 500 μm or less. Further, as shown in FIG. 3A, when the base material portion 51 constitutes the surface of the decorative sheet 50, the base material portion 51 may be a hard coat layer having scratch resistance. When the base material portion 51 is a hard coat layer, the thickness of the base material portion 51 may be, for example, 1 μm or more and 500 μm or less.

[0037] Note that "transparent" means that when the measurement wavelength is 380 nm or more and 780 nm or less, the visible light transmittance specified as the average value of the transmittance at each wavelength is 80% or more. The visible light transmittance is measured using a spectrophotometer ("UV-3100PC" manufactured by Shimadzu Corporation, compliant with JIS K 0115).

[0038] The design part 53 is a part that forms the design displayed by the decorative sheet 50. The design part 53 forms a pattern such as a figure, pattern, design, color, picture, photograph, character, mark, letter, or number as a design. In particular, the design part 53 may form a design that can be harmonized with the surrounding environment where the display device 1 with a decorative sheet is provided. Examples of such designs include wood grain or marble grain patterns and geometric patterns.

[0039] In addition, the design part 53 may form a pattern formed by solid printing a single color as a design. In the examples shown in FIGS. 3A and 3B, in a cross section along the direction orthogonal to the sheet surface of the decorative sheet 50, the cross-sectional shape of the design part 53 is rectangular. However, it is not limited to this, and the cross-sectional shape of the design part 53 may be trapezoidal or the like.

[0040] Note that when the thickness of the design part 53 is sufficiently thick, the design formed by the design part 53 can be made dark and clear. Here, the thickness of the design part 53 is the length of the design part 53 along the normal direction of the plate surface of the base material part 51 that supports the design part 53. As a specific example, the thickness of the design part 53 may be 1 μm or more and 20 μm or less.

[0041] As shown in FIG. 4, a plurality of design portions 53 are arranged in the third direction d3 and extend linearly, particularly in a straight line, in the fourth direction d4. The plurality of design portions 53 are arranged at intervals from each other. The third direction d3 and the fourth direction d4 are directions 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 (see FIG. 6). In the present embodiment, the third direction d3 and the fourth direction d4 are directions inclined with respect to the end side 50a of the decorative sheet 50. Preferably, the third direction d3 and the fourth direction d4 are orthogonal to each other. Also, the second direction d2 and the third direction d3 are not orthogonal. Specifically, the smaller angle θ (see FIG. 6) formed by the second direction d2 and the third direction d3 may be 5° or more and 85° or less, preferably 55° or more and 80° or less, and more preferably 15° or more and 35° or less. Note that the third direction d3 only needs to be a direction non-parallel to at least one of the first direction d1 and the second direction d2. For example, the third direction d3 may be a direction parallel to the first direction d1 and non-parallel to the second direction d2. Also, for example, the third direction d3 may be a direction non-parallel to the first direction d1 and parallel to the second direction d2.

[0042] The design portions 53 are arranged at an arrangement pitch p3 along the third direction d3. The arrangement pitch p3 of the design portions 53 is constant. Details of the pitch p3 will be described later.

[0043] The shielding portion 55 has a function of absorbing light so that the image light from the display device 10 does not enter the design portion 53. The shielding portion 55 covers the design portion 53 from the side of the display device 10. The shielding portion 55 is preferably provided only at a position facing the design portion 53. Thereby, when the image light emitted from the display device 10 passes through the transmissive portion 57, it is possible to suppress the transmission of the image light from being inhibited by the shielding portion 55. Also, when the shielding portion 55 having a sufficient thickness covers the design portion 53, the design formed by the design portion 53 can be made darker and clearer. As a specific example, the thickness of the shielding portion 55 may be, for example, 1 μm or more and 20 μm or less.

[0044] The shielding portion 55 may include, for example, a binder resin and light absorption particles contained in the binder resin. Examples of the light absorption particles include black pigments such as carbon black or titanium black.

[0045] The transmissive portion 57 is a portion for transmitting the image light from the display device 10 in the decorative sheet 50. As shown in FIGS. 3A and 3B, the transmissive portion 57 is a non-formed portion of the design portion 53 and the shielding portion 55. In order to sufficiently transmit the image light from the display device 10, in a front view of the decorative sheet 50, the ratio of the area occupied by the transmissive portion 57 is preferably 15% or more, more preferably 20% or more, and even more preferably 25% or more. On the other hand, in order to make it easier to observe the design displayed by the decorative sheet 50, in a front view of the decorative sheet 50, the ratio of the area occupied by the transmissive portion 57 is preferably 70% or less, more preferably 60% or less, and even more preferably 50% or less.

[0046] As described above, the transmissive portion 57 is a non-formed portion of the design portion 53 and the shielding portion 55. Therefore, as shown in FIG. 4, the transmissive portions 57 are arranged in the third direction d3 (the first arrangement direction) and extend in the fourth direction d4 (the second arrangement direction non-parallel to the first arrangement direction). The plurality of transmissive portions 57 are arranged at intervals from each other, and a design portion 53 is formed between each transmissive portion 57. Further, since the design portions 53 are arranged at an arrangement pitch p3 along the third direction d3, the transmissive portions 57 are also arranged at the arrangement pitch p3 along the third direction d3. Furthermore, since the design portions 53 extend linearly (straight) in the fourth direction d4, the transmissive portions 57 also extend linearly (straight) in the fourth direction d4. In this way, since the transmissive portions 57 are arranged in the third direction d3 and extend in the fourth direction d4, the image light from the display device 10 can be transmitted uniformly. For this reason, unevenness is less likely to occur in the image light.

[0047] Next, the transmissive portion 57 will be described in more detail.

[0048] As shown in FIG. 5, the transmissive portion 57 has a plurality of unit transmissive regions 59 arranged along the fourth direction d4 (second array direction). The unit transmissive regions 59 adjacent to each other in the fourth direction d4 are connected to each other without a gap. This unit transmissive region 59 is a region formed by the laser intermittently irradiated when forming the transmissive portion 57 with a laser. That is, when forming the transmissive portion 57, the laser is scanned along the fourth direction d4. At this time, by irradiating the laser to a predetermined region, for example, a circular unit transmissive region 591 as shown by the virtual line (two-dot chain line) in FIG. 5 is formed. Next, along the fourth direction d4, the irradiation position of the laser is changed. Thereby, another unit transmissive region 592 is formed so as to overlap the unit transmissive region 591. Similarly, by changing the irradiation position of the laser, another unit transmissive region 593 is formed so as to overlap the unit transmissive region 592. In this way, by scanning the laser along the fourth direction d4, the transmissive portion 57 having a plurality of unit transmissive regions 59 arranged along the fourth direction d4 is formed.

[0049] The unit transmissive region 59 includes a pair of side edges 59a extending in the fourth direction d4. This pair of side edges 59a are curved so as to be convex in a direction away from each other. As described above, the unit transmissive region 59 is a region formed by overlapping the circular unit transmissive regions 591 to 593 with each other. Therefore, in this embodiment, the shape of the pair of side edges 59a is an arc.

[0050] Also, in this case, the rate of change of the width of the unit transmission region 59 may be 10% or more and 95% or less, preferably 20% or more and 90% or less. The rate of change of the width of the unit transmission region 59 is a value ((W1 - W2) / W1) obtained by dividing the difference between the width W1 of the widest part of the width of the unit transmission region 59 and the width W2 of the narrowest part of the width of the unit transmission region 59 by the width W1. When the rate of change of the width is 10% or more, as will be described later, when the decorative sheet 50 has a top coat layer, the adhesion between the base material part 51, the design part 53, the shielding part 55, and the top coat layer can be improved. Further, when the rate of change of the width is 95% or less, as will be described later, the boundary between the design part 53 and the transmission part 57 can be made unclear. Thereby, the presence of the transmission part 57 can be made difficult to be visually recognized. Also, when the rate of change of the width is 95% or less, the regularity of the transmission part 57 in the fourth direction d4 can be suppressed. Therefore, it is possible to suppress a reduction in the moire suppression effect.

[0051] Here, the width W1 may be 15 μm or more and 140 μm or less, preferably 15 μm or more and 120 μm or less. When the width W1 is 15 μm or more, the workability of the transmission part 57 can be improved. Also, when the width W1 is 140 μm or less, it is possible to suppress each transmission part 57 from becoming too large. Therefore, it is possible to suppress each transmission part 57 from being visually recognized. As a result, it is possible to suppress the observation of a reticular pattern due to the transmission part 57. Note that the width W1 is equal to the diameter of the circular unit transmission regions 591 to 593 described above.

[0052] As shown in FIG. 6, the pitch p3 of the transmissive portion 57 may be shorter than the pitch p1 of the pixel 13 in the first direction d1 and the pitch p2 of the pixel 13 in the second direction d2. Thereby, the pixel 13, the lens portion 63, and the transmissive portion 57 can be arranged irregularly. Here, in the display device 10, moiré may occur due to the regularity of the pixel 13, the regularity of the lens portion 63, and the regularity of the transmissive portion 57. On the other hand, since the pixel 13, the lens portion 63, and the transmissive portion 57 can be arranged irregularly, when the display device 10 displays a stereoscopic image that can be viewed with the naked eye and when a planar image is displayed, it is possible to effectively suppress the occurrence of moiré on the display surface 11.

[0053] The pitch p3 of the transmissive portion 57 may be 30 μm or more and 60 μm or less. By the pitch p3 of the transmissive portion 57 being 30 μm or more, the workability of the transmissive portion 57 can be improved. Further, by the pitch p3 of the transmissive portion 57 being 60 μm or less, the pixel 13 (and the lens portion 63) and the transmissive portion 57 can be arranged more irregularly. For this reason, when the display device 10 displays a stereoscopic image that can be viewed with the naked eye and when a planar image is displayed, it is possible to more effectively suppress the occurrence of moiré on the display surface 11. Further, by the pitch p3 of the transmissive portion 57 being 60 μm or less, it is possible to suppress the difference between the portion where the image is displayed and the portion where the image is not displayed by the display device 10 from being visually recognized.

[0054] When forming the transmissive portion 57, for example, a laser is irradiated to the position where the transmissive portion 57 is to be formed with respect to the design portion 53 and the shielding portion 55 provided on the entire surface of the base material portion 51. Thereby, the design portion 53 and the shielding portion 55 at the position irradiated with the laser are removed, and the transmissive portion 57 is formed.

[0055] Note that the transmissive portion 57 may be a hole or a void as shown in FIGS. 3A and 3B, or may be formed of, for example, a transparent resin. Further, the transparent resin may be provided so as to cover not only the transmissive portion 57 but also the design portion 53 and the shielding portion 55 from the display device 10 side. Such a transparent resin can function as a transparent protective film that forms the transmissive portion 57 and protects the design portion 53 and the shielding portion 55.

[0056] Next, the lenticular lens layer 60 will be described.

[0057] <Lenticular Lens Layer> As shown in FIG. 1, the lenticular lens layer 60 is disposed between the display device 10 and the decorative sheet 50. The lenticular lens layer 60 serves to refract the image light from the display surface 11 of the display device 10 so as to direct it to a desired position. The lenticular lens layer 60 covers the entire display surface 11 so that the image light from the display surface 11 is incident thereon. Therefore, the lenticular lens layer 60 has a size equal to or larger than the size of the display surface 11. In the example shown in FIG. 1, the lenticular lens layer 60 is a flat plate member that extends in the same direction as the display surface 11 of the display device 10 as a whole. The thickness of the lenticular lens layer 60 may be, for example, 15 μm or more and 4000 μm or less.

[0058] In the present embodiment, the lenticular lens layer 60 refracts the image light so that the image displayed on the display surface 11 of the display device 10 can be observed stereoscopically. More specifically, by utilizing binocular parallax and motion parallax, the image can be observed stereoscopically.

[0059] As shown in FIG. 7, the pixels 13 of the display device 10 are allocated to the right-eye pixels 13R and the left-eye pixels 13L according to a plurality of positions where the observer's left or right eye is assumed to be located. A plurality of pixels 13 allocated according to the same position form an image to be observed at the allocated position. On the other hand, the lenticular lens layer 60 refracts the image light so that the image light from each pixel 13 travels toward the position where the pixel 13 is allocated among the plurality of positions where the observer's left or right eye is assumed to be located. As a result, different images are observed by the observer's right and left eyes at each position. Thereby, the observer can recognize the image stereoscopically. Further, when the observation direction is changed, the image can be observed stereoscopically according to the observation position.

[0060] As shown in FIG. 8, the lenticular lens layer 60 has a base material 61 and a plurality of lens portions 63 provided on the base material 61. The base material 61 is a member for supporting the lens portions 63. The base material 61 and the lens portions 63 are transparent. The plurality of lens portions 63 are arranged in the first direction d1. Further, each lens portion 63 extends in the second direction d2.

[0061] As shown in FIG. 8, in a cross section orthogonal to the second direction d2, the lens portion 63 is a convex lens having a semi-elliptical cross section. The lens portion 63 expands and emits the light from the base material 61 side in the first direction d1. In order to avoid forming a reflection interface between the base material 61 and the lens portion 63, it is preferable that the refractive index of the base material 61 and the refractive index of the lens portion 63 are the same. In the present embodiment, the base material 61 and the lens portions 63 are made of the same material and are integrally formed. In order to appropriately refract light at the interface between the lens portion 63 and the outside of the lenticular lens layer 60, the refractive index of the lens portion 63 is preferably, for example, 1.3 or more and 1.8 or less.

[0062] As materials for the base material 61 and the lens part 63 (materials for the lenticular lens layer 60), various materials can be used. The material for the lenticular lens layer 60 may be, for example, polyester, polycarbonate, polyvinyl alcohol, polyvinylidene fluoride, polyolefin, norbornene-based polymer, polyether ketone, polyether sulfone, polysulfone, polyamide, polyimide, acrylic polymer, cellulose resin, polyarylate, polystyrene, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, acetate-based polymer, etc. Examples of polyester include copolymers such as PET (polyethylene terephthalate), PEN (polyethylene naphthalate), a mixture of PET and PEN, and PET-PEN copolymer. Examples of polyolefin include polyethylene, polypropylene, etc. Examples of acetate-based polymer include polyvinyl acetal-based polymer, etc.

[0063] The pitch p4 of the arrangement in the first direction d1 of the lens part 63 (see Fig. 7) is preferably 100 μm or more. Thereby, it is possible to suppress the pitch p4 of the arrangement in the first direction d1 of the lens part 63 from becoming too small with respect to the pixel 13. For this reason, for example, the image light of the pixel 13 assumed to be observed by the left eye of the observer can be easily directed to a position assumed to be where the left eye of the observer is located. For this reason, the observer can appropriately observe the image. Also, the pitch p4 of the arrangement in the first direction d1 of the lens part 63 is preferably 1700 μm or less, and more preferably 840 μm or less. Thereby, it is possible to suppress the pitch p4 of the arrangement in the first direction d1 of the lens part 63 from becoming too large. For this reason, it is possible to suppress the image displayed on the display surface 11 of the display device 10 from being observed coarsely.

[0064] Next, the light control layer 70 will be described.

[0065] <Light control layer> As shown in Fig. 1, the light control layer 70 is disposed between the decorative sheet 50 and the lenticular lens layer 60. This light control layer 70 serves to control the traveling direction of the image light from the lenticular lens layer 60. More specifically, the light control layer 70 serves to limit the viewing angle at which the image light is observed so that the image light from the lenticular lens layer 60 does not spread too much in the first direction d1. Preferably, the light control layer 70 covers the entire lenticular lens layer 60 so that the image light from the lenticular lens layer 60 is incident thereon. Therefore, the light control layer 70 has a dimension equal to or larger than the dimension of the lenticular lens layer 60. In the example shown in Fig. 1, the light control layer 70 is a flat member that extends in the same direction as the display surface 11 of the display device 10 as a whole. The thickness of the light control layer 70 may be, for example, 120 μm or more and 170 μm or less.

[0066] As shown in Fig. 9, the light control layer 70 has a base 71 and a light control portion 73 provided on the base 71. Among these, the base 71 is a member for appropriately supporting the light control portion 73.

[0067] The base 71 has visible light transmissivity. Various materials may be used as the material constituting the base 71. The material constituting the base 71 may be, for example, a polyester-based resin, an acrylic-based resin, a urethane-based resin, an amide-based resin, a silicone-based resin, an epoxy-based resin, or a polycarbonate resin. In order to avoid forming a reflection interface between the base 71 and the transparent portion 77, which will be described later, of the light control portion 73, the refractive index of the base 71 and the refractive index of the transparent portion 77 are preferably the same. In the present embodiment, the base 71 and the transparent portion 77 of the light control portion 73 are made of the same material and are integrally formed.

[0068] The light control portion 73 has light-shielding portions 75 arranged in the first direction d1 and transparent portions 77 arranged alternately with the light-shielding portions 75 in the first direction d1. The light-shielding portions 75 extend in the second direction d2. Note that the light-shielding portions 75 and the transparent portions 77 may be arranged in a direction non-parallel to the first direction d1. Also, the light-shielding portions 75 may extend in a direction non-parallel to the second direction d2.

[0069] The light-shielding portion 75 has light absorptivity. The light-shielding portion 75 may include, for example, a binder resin and light-absorbing particles contained in the binder resin. Examples of the light-absorbing particles include black pigments such as carbon black or titanium black. On the other hand, the transparent portion 77 has visible light transmissivity.

[0070] In the light-shielding portion 75 and the transparent portion 77, various cross-sectional shapes may be adopted according to the required functions. In the present embodiment, as shown in FIGS. 3A and 3B, the width of the light-shielding portion 75 along the first direction d1 becomes narrower as it separates from the decorative sheet 50. Here, "becoming narrower as it separates from the decorative sheet" does not only mean continuously changing according to the distance from the decorative sheet 50. "Becoming narrower as it separates from the decorative sheet" means including a portion where the width becomes narrower as it separates from the decorative sheet 50 and not including a portion where the width becomes wider as it separates from the decorative sheet 50. Preferably, in at least a part of the region along the normal direction of the light control layer 70, the width of the light-shielding portion 75 is preferably continuously decreasing.

[0071] Specifically, in the example shown in FIG. 10, the cross-sectional shape of the light-shielding portion 75 and the cross-sectional shape of the transparent portion 77 are each a trapezoid in which the upper base is sufficiently smaller than the lower base. In the light-shielding portion 75, the lower base of the trapezoid faces the observer side (i.e., the decorative sheet 50 side), and the upper base of the trapezoid faces the display device 10 side (i.e., the lenticular lens layer 60 side). In the cross-section shown in FIG. 10, the maximum length of the light-shielding portion 75 along the first direction d1 may be, for example, 10 μm or more and 100 μm or less. Also, in the cross-section shown in FIG. 10, the maximum length of the transparent portion 77 along the first direction d1 may be, for example, 10 μm or more and 100 μm or less.

[0072] In the cross section shown in FIG. 10, the ratio of the length along the direction orthogonal to the first direction d1 of the light shielding portion 75 to the maximum length along the first direction d1 of the light shielding portion 75 is preferably 2 or more. In such a case, the traveling direction of the image light can be appropriately controlled. More specifically, it is possible to suppress the image light from spreading in the first direction d1 which is the arrangement direction of the light shielding portion 75. Further, in the cross section shown in FIG. 10, the ratio of the length along the direction orthogonal to the first direction d1 of the light shielding portion 75 to the maximum length along the first direction d1 is preferably 5 or less. Thereby, it is possible to suppress the image light from being absorbed by the light shielding portion 75. For this reason, it is possible to suppress the image from being observed darkly.

[0073] The pitch p5 of the arrangement of the light shielding portions 75 in the first direction d1 may be 50 μm or more and 200 μm or less. When the pitch p5 is 50 μm or more, the light shielding portion 75 can be easily formed. When the pitch p5 is 200 μm or less, it is possible to suppress the image light traveling in a direction inclined with respect to the first direction d1 from passing through the transparent portion 77. For this reason, the traveling direction of the image light can be sufficiently controlled. In other words, it is possible to suppress the image light from spreading in the first direction d1.

[0074] The light shielding portion 75 and the transparent portion 77 may be formed of materials having different refractive indices. Thereby, the interface between the light shielding portion 75 and the transparent portion 77 can be used as a reflecting surface. In this case, the traveling direction of the light incident on the interface between the light shielding portion 75 and the transparent portion 77 can be changed by reflection at the reflecting surface. Thereby, while suppressing the image light from being absorbed by the light shielding portion 75, the traveling direction of the image light can be controlled.

[0075] Here, the pitch p3 (see FIG. 4) of the arrangement in the third direction d3 of the transmissive portion 57 of the decorative sheet 50 described above is preferably smaller than the pitch p4 (see FIG. 7) of the arrangement in the first direction d1 of the lens portion 63 of the lenticular lens layer 60. Also, the pitch p5 (see FIG. 10) of the arrangement in the first direction d1 of the light-shielding portion 75 of the light control layer 70 is preferably smaller than the pitch p4 of the arrangement in the first direction d1 of the lens portion 63. Further, the pitch p5 of the arrangement in the first direction d1 of the light-shielding portion 75 is preferably smaller than the pitch p3 of the arrangement in the third direction d3 of the transmissive portion 57. That is, among the pitch p3 of the transmissive portion 57, the pitch p4 of the lens portion 63, and the pitch p5 of the light-shielding portion 75, it is preferable that the pitch p4 of the lens portion 63 is the largest and the pitch p5 of the light-shielding portion 75 is the smallest.

[0076] Next, an example of the operation of the display device 1 with the decorative sheet according to the present embodiment will be described.

[0077] In a state where an image is not displayed on the display surface 11 of the display device 10, as shown in FIG. 11, the design formed by the design portion 53 of the decorative sheet 50 is displayed. That is, the display device 1 with the decorative sheet can display a design intended to be observed. Due to the displayed design, the display surface 11 of the display device 10 becomes unobservable from an external observer, and the display device 1 with the decorative sheet can be harmonized with the surrounding environment in terms of design. In particular, when the shielding portion 55 is provided only at a position facing the design portion 53, the shielding portion 55 is not observed by the observer, and it is possible to suppress the design property of the decorative sheet 50 from being impaired by the shielding portion 55.

[0078] On the one hand, when the display device 10 displays an image on the display surface 11, the display device 10 displays a stereoscopic image or a planar image that can be visually recognized with the naked eye. When the display device 10 displays a stereoscopic image, the image light is refracted by the lens part 63 of the lenticular lens layer 60, passes through the transparent part 77 of the light control layer 70, and then passes through the transmissive part 57 and the base material part 51 of the decorative sheet 50. As a result, as shown in FIG. 12, an observer positioned in the front direction of the display device 1 with the decorative sheet can observe the image. In particular, when the image light is refracted by the lens part 63 of the lenticular lens layer 60, different images are observed by the right eye and the left eye of the observer, such as the image lights L51R and L51L shown in FIG. 7, so that the observer can recognize the image stereoscopically. In particular, since different images are observed by the right eye and the left eye of the observer at each position, even when the observation direction of the observer changes, such as the image lights L52R and L52L shown in FIG. 7, the observer can recognize the image stereoscopically. That is, the display device 1 with the decorative sheet can display the image intended to be observed, and an external observer can observe the image.

[0079] Also, in the present embodiment, the design part 53 is covered from the display device 10 side by the shielding part 55. Therefore, the shielding part 55 prevents the image light from entering the design part 53. For this reason, it is possible to prevent the design represented by the design part 53 and the image light from being mixed and observed when the image light passes through the design part 53. That is, it is possible to prevent the visible light in a specific wavelength range from being absorbed in the design part 53. As a result, it is possible to effectively prevent the deterioration of the color reproducibility of the image caused by the absorption of visible light in the design part 53. Further, when the shielding part 55 is provided only in the region facing the design part 53, it is possible to prevent the image light passing through the transmissive part 57 from being obstructed by the shielding part 55. That is, the image can be brightly displayed by efficiently using the image light.

[0080] Incidentally, as described above, in a conventional display device with a decorative sheet, moiré may be observed when the display device displays an image. Moiré is caused by the regular arrangement of the pixels of the display device and the regular arrangement of the transmissive portions of the decorative sheet. Specifically, the image light emitted from the regularly arranged pixels includes the periodicity due to the arrangement of the pixels. Further, the image light passes through the regularly arranged transmissive portions, and includes the periodicity of the transmissive portions and is emitted from the decorative sheet. That is, the image light emitted from the decorative sheet includes the periodicity due to the arrangement of the pixels and the periodicity due to the arrangement of the transmissive portions. When these two periodicities interfere with each other, moiré (interference fringes) occurs in the observed image. Such moiré deteriorates the visibility of the image displayed on the display device, and thus it is desirable to suppress the occurrence of moiré. In particular, in a display device that displays a stereoscopic image and a planar image, when displaying a planar image, it is required to suppress the occurrence of moiré caused by the pixel pitch (periodicity), and when displaying a stereoscopic image, it is required to suppress the occurrence of moiré caused by the pitch (periodicity) of the pixels and the lenticular lens layer or the like.

[0081] In order to suppress the occurrence of moiré, it is considered effective to reduce the directions in which the two elements causing the interference exhibit regularity. In the display device 1 with a decorative sheet according to the present embodiment, the transmissive portions 57 are arranged in a third direction d3 that is non-parallel to both the first direction d1 and the second direction d2, and linearly extend in a fourth direction d4 that is non-parallel to the third direction d3. As a result, the regularity exhibited by the transmissive portions 57 is caused only by the third direction d3, which is the arrangement direction. Thereby, it is possible to effectively suppress the occurrence of moiré caused by the interference between the regularity of the pixels 13 arranged in the first direction d1 and the second direction, the regularity of the lens portions 63 of the lenticular lens layer 60 arranged in the first direction d1, and the regularity of the transmissive portions 57 arranged in the third direction d3.

[0082] Here, as shown in FIG. 13, when the transmissive portion 57 is composed of a plurality of holes arranged along the fourth direction d4, the transmissive portion 57 exhibits regularity not only in the third direction d3 but also in the fourth direction d4. In this case, since the number of regularities that can interfere increases, moiré may be more likely to occur. On the other hand, in the present embodiment, the transmissive portion 57 is arranged in the third direction d3 that is non-parallel to both the first direction d1 and the second direction d2, and linearly extends in the fourth direction d4 that is non-parallel to the third direction d3. Thereby, the regularity exhibited by the transmissive portion 57 is caused only by the third direction d3 which is the arrangement direction. Thereby, the occurrence of moiré caused by the interference among the regularity of the pixel 13, the regularity of the lens portion 63, and the regularity of the transmissive portion 57 can be effectively suppressed.

[0083] Also, in order to suppress the occurrence of moiré, it is considered effective to shift the arrangement pitch of the elements causing interference. In the display device 1 with the decorative sheet of the present embodiment, the pitch p3 of the transmissive portion 57 is shorter than the pitch p1 of the pixel 13 in the first direction d1 and the pitch p2 of the pixel 13 in the second direction d2. Thereby, the pixel 13 and the transmissive portion 57 can be irregularly arranged. Thereby, the occurrence of moiré caused by the interference between the regularity of the pixel 13 and the regularity of the transmissive portion 57 can be effectively suppressed.

[0084] As described above, according to the present embodiment, the display device 1 with a decorative sheet 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 50 disposed on top of the display device 10. Further, the decorative sheet 50 has a plurality of design portions 53 forming a design and a plurality of transmission portions 57 which are non-forming portions of the design portions 53. Furthermore, the transmission portions 57 are arranged in a third direction d3 non-parallel to both the first direction d1 and the second direction d2 and linearly extend in a fourth direction d4 non-parallel to the third direction d3. Thereby, the regularity exhibited by the transmission portions 57 is caused only by the third direction d3 which is the arrangement direction. For this reason, it is possible to effectively suppress the occurrence of moiré caused by the interference between the regularity of the pixels 13 arranged in the first direction d1 and the second direction, the regularity of the lens portions 63 of the lenticular lens layer 60 arranged in the first direction d1, and the regularity of the transmission portions 57 arranged in the third direction d3.

[0085] Also, according to the present embodiment, the decorative sheet 50 includes a plurality of design portions 53 forming a design and a plurality of transmission portions 57 which are non-forming portions of the design portions 53. Further, the transmission portions 57 are arranged in the third direction d3 (first arrangement direction) and linearly extend in a fourth direction d4 (second arrangement direction) non-parallel to the third direction d3. Also, the transmission portions 57 have a plurality of unit transmission regions 59 arranged along the fourth direction d4. Further, the unit transmission region 59 includes a pair of side edges 59a extending in the fourth direction d4. Furthermore, the pair of side edges 59a are curved so as to be convex in a direction away from each other. Thereby, the length of the pair of side edges 59a (outer edges of the transmission portions 57) can be made shorter as compared with the case where the transmission portions 57 are constituted by a plurality of holes arranged along the fourth direction d4. In this case, when forming the transmission portions 57, it is possible to reduce the residues of the design portions 53 and the shielding portions 55 that may occur along the side edges 59a. Also, since the residues are reduced, light scattering can also be reduced. For this reason, sharpness can be improved and haze can be reduced.

[0086] Further, since a pair of side edges 59a are curved so as to protrude in a direction in which they are separated from each other, when the decorative sheet 50 has a top coat layer, the adhesion between the base material portion 51, the design portion 53, the shielding portion 55, and the top coat layer can be improved. That is, since a pair of side edges 59a are curved so as to protrude in a direction in which they are separated from each other, when forming the top coat layer, the coating liquid for the top coat layer enters the recesses formed between the unit transmission regions 59. Therefore, the adhesion between the base material portion 51 and the like and the top coat layer can be improved.

[0087] Furthermore, since a pair of side edges 59a are curved so as to protrude in a direction in which they are separated from each other, the boundary between the design portion 53 and the transmission portion 57 becomes unclear. Thereby, the presence of the transmission portion 57 can be made even more difficult to visually recognize.

[0088] It should be noted that various changes can be made to the above-described embodiments.

[0089] For example, in the above-described embodiment, the example in which the display device 1 with a decorative sheet includes the lenticular lens layer 60 has been described, but the present invention is not limited to this. For example, although not shown in the drawings, the decorative sheet 50 may function as a parallax barrier. Also in this case, since the regularity exhibited by the transmission portion 57 is caused only by the third direction d3 which is the arrangement direction, the occurrence of moire caused by the interference between the regularity of the pixel 13 and the regularity of the transmission portion 57 can be effectively suppressed. When the decorative sheet 50 functions as a parallax barrier, the third direction d3 is a direction non-parallel to both the first direction d1 and the second direction d2.

[0090] Also, for example, in the above-described embodiment, the example in which the display device 1 with a decorative sheet is a display device that displays a stereoscopic image and a planar image has been described, but the present invention is not limited to this. The decorative sheet 50 according to the present embodiment may be applied to a display device that displays only a planar image.

[0091] The above-described display device 1 with a decorative sheet and the decorative sheet 50 can be used, for example, as interior or exterior members of vehicles such as automobiles or railways, aircraft, ships, and spacecraft. As a specific application example, the display device 1 with a decorative sheet having the decorative sheet 50 may be used for a center console or a door trim of an automobile. Alternatively, the display device 1 with a decorative sheet and the decorative sheet 50 may be incorporated into interior or exterior members of a building, electronic devices, furniture, or household appliances for use.

Explanation of Reference Numerals

[0092] 1 Display device with a decorative sheet 10 Display device 11 Display surface 13 Pixel 50 Decorative sheet 53 Design portion 57 Transmissive portion 59 Unit transmissive region 59a Side edge 60 Lenticular lens layer

Claims

1. A display device with a decorative sheet that displays a stereoscopic image visible to the naked eye, comprising: 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 overlapping the display device, The decorative sheet has a plurality of design portions forming a design and a plurality of transmission portions that are non-forming portions of the design portions, The transmission portions are arranged in a third direction non-parallel to at least one of the first direction and the second direction, and linearly extend in a fourth direction non-parallel to the third direction. A display device with a decorative sheet.

2. The display device with a decorative sheet according to claim 1, further comprising a lenticular lens layer disposed between the display device and the decorative sheet.

3. The third direction is non-parallel to both the first direction and the second direction, The display device with a decorative sheet according to claim 1, wherein the decorative sheet functions as a parallax barrier.

4. The display device with a decorative sheet according to claim 1, wherein the display device is locally dimmable.

5. The pitch of the transmission portions is shorter than the pitch of the pixels in the first direction and the pitch of the pixels in the second direction. A display device with a decorative sheet according to claim 1.

6. The transmission portions have a plurality of unit transmission regions arranged along the fourth direction, The unit transmission region includes a pair of side edges extending in the fourth direction, The pair of side edges are curved so as to be convex in a direction away from each other. A display device with a decorative sheet according to claim 1.

7. A decorative sheet, Comprising a plurality of design portions forming a design and a plurality of transmission portions that are non-forming portions of the design portions, The transmission portions are arranged in a first arrangement direction and linearly extend in a second arrangement direction non-parallel to the first arrangement direction, The transmission portions have a plurality of unit transmission regions arranged along the second arrangement direction, The unit transmission region includes a pair of side edges extending in the second arrangement direction, The pair of side edges are curved so as to be convex in a direction away from each other. A decorative sheet. ​

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