JP2022082111A - Display device with decorative sheet - Google Patents

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

The present invention relates to a display device with a decorative sheet.

Display devices that display images are widely used. Such a display device is usually observed in black when the image is not displayed. On the other hand, in surface members such as automobiles, furniture, and housing building materials, designability is very important. At present, display devices particularly applied to such fields are expected not only to have a function of displaying an image on the display device, but also to have a design that is in harmony with the surrounding environment.

In order to impart design to the 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 department on the surface. As a result, the display device with a decorative sheet is given a design. The display device with a decorative sheet can be in harmony with the surrounding environment due to the added design. Further, the decorative sheet is provided with a transmitting portion through which visible light can be transmitted so that the image light of the display device can pass through the decorative sheet.

Japanese Unexamined Patent Publication No. 2001-331132

By the way, in a display device with a decorative sheet as shown in Patent Document 1, a striped pattern may be observed in an image displayed by the display device. As examined by the inventors of the present invention, the striped pattern is moire (interference) caused by the regular arrangement of the transmissive portions provided on the decorative sheet and the regular arrangement of the pixels of the display device. It was found to be stripes). Such moire deteriorates the visibility of the image displayed on the display device. Therefore, it is desired to suppress the occurrence of moire.

The present invention has been made in consideration of such a point, and an object of the present invention is to suppress the occurrence of moire.

The display device with a decorative sheet of the present invention is
A display device having a plurality of pixels arranged in a first direction and a second direction non-parallel to the first direction, and a display device having a plurality of pixels.
A decorative sheet arranged facing the display device is provided.
The decorative sheet has a plurality of design portions for forming a design and a plurality of transmissive portions which are non-forming portions of the design portion.
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 transmissive portion in the decorative sheet is 15% or more and 50% or less.
The average of the arrangement pitches of the design portions along the third direction is 90% or less of the arrangement pitches of the pixels along the first direction and the second direction.
The smaller angle between the first direction and the third direction is 5 ° or more and 85 ° or less.

In the display device with a decorative sheet of the present invention
The pixel is rectangular and
The smallest angle between the diagonal direction of the pixel and the third direction may be 10 ° or more and 35 ° or less.

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.

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

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 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.

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.

According to the present invention, the occurrence of moire can be suppressed.

FIG. 1 is an exploded perspective view schematically showing a display device with a decorative sheet. FIG. 2 is a cross-sectional view of a display device with a decorative sheet. FIG. 3 is an enlarged front view showing a part of the display device. FIG. 4 is an enlarged front view showing a part of the decorative sheet. FIG. 5 is an enlarged front view showing a part of the display device with a decorative sheet. FIG. 6 is a front view showing a part of the display device with a decorative sheet in a further enlarged manner. FIG. 7 is a perspective view for explaining a viewing angle of a display device with a decorative sheet. FIG. 8 is a front view of a display device with a decorative sheet showing a state in which the display device is not displaying an image. FIG. 9 is a front view of a display device with a decorative sheet showing a state in which the display device is displaying an image. FIG. 10 is an enlarged front view showing a part of a display device with a decorative sheet showing a modified example of the decorative sheet. FIG. 11 is an enlarged front view showing a part of a display device with a decorative sheet showing another modification of the decorative sheet.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

Further, in the present specification, the terms "layer", "sheet" and "film" are not distinguished from each other based only on the difference in designation. For example, the term "sheet" is a concept that also includes members that may be called layers or films.

Furthermore, as used herein, the terms such as "parallel", "orthogonal", and "identical" and the values of length and angle that specify the shape and geometric conditions and their degrees are strictly referred to. It is intended to be interpreted to the extent that similar functions can be expected without being bound by meaning.

FIG. 1 is an exploded perspective view schematically showing 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 for displaying an image. The decorative sheet 20 is arranged so as to face the display surface 11 of the display device 10. Further, FIG. 2 shows 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 side of the decorative sheet 20 provided with the light-shielding portion 25 with respect to the design portion 23 described later is the side facing the display device 10. It is arranged like this. 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 is formed by bending each component of the display device 1 with a decorative sheet. , May be curved. For example, only the decorative sheet 20 may be curved, or the display surface 11 of the display device 10 and the decorative sheet 20 may be curved.

The display device 1 with a decorative sheet can take a non-display state and a display state of an image. In the non-display state of the image, the display device 1 with a decorative sheet can display the design formed by the decorative sheet 20. 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.

First, the display device 10 will be described. The display device 10 can display an image on the display surface 11. The display device 10 can emit image light from the display surface 11. As the display device 10, any display device such as a liquid crystal display, a plasma display, or an organic EL display can be used. The display surface 11 of such a display device 10 is typically a glass surface. The display surface 11 extends in the first direction d1 and the second direction d2 which 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. Further, the display device 10 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.

Further, FIG. 3 is an enlarged front view showing a part 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 grid 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 grid pattern. Pixels 13 are arranged in the gaps formed by the black matrix 15.

Pixels 13 form 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. 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 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.

As shown in FIG. 3, the pixels 13 are arranged at a constant arrangement pitch p1 along the first direction d1 and are arranged 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. It is arranged. In the illustrated example, the arrangement pitch p1 along the first direction d1 of the pixel 13 has the same length as the arrangement pitch p2 along the second direction d2. The array pitch p1 along the first direction d1 and the array pitch p2 along the second direction d2 of the pixel 13 are, for example, 50 μm or more and 500 μm or less. Further, in the pixel 13, the first sub-pixel 13R, the second sub-pixel 13G, and the third sub-pixel 13B are arranged side by side along the second direction d2. In the front view as shown in FIG. 3, the first sub-pixel 13R, the second sub-pixel 13G, and the third sub-pixel 13B are each a rectangle longer in the first direction d1 than the second direction d2, and the pixel 13 is a rectangle. , Especially square. The length of one side of the pixel 13 is, for example, 50 μm or more and 500 μm or less.

Next, the decorative sheet 20 will be described. The decorative sheet 20 is arranged so as to face the display surface 11 of the display device 10, and covers at least the entire display surface 11 so that the display surface 11 is not directly observed from the outside. In the decorative sheet 20, the dimensions of the first direction d1 and the second direction d2 are equal to or larger than the dimensions of the display surface 11 so that the entire display surface 11 of the display device 10 can be covered. In the example shown in FIG. 1, the decorative sheet 20 is a flat plate-shaped member that spreads in the same direction as the display surface 11 of the display device 10 as a whole. The thickness of the decorative sheet 20 is, for example, 20 μm or more and 550 μm or less.

The decorative sheet 20 displays the 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 material portion 21, a plurality of design portions 23, a light-shielding portion 25, and a transmission portion 27. The design portion 23 is provided so as to be laminated on the base material portion 21. The light-shielding portion 25 is provided so as to be laminated on the design portion 23. The transmission portion 27 is a non-forming portion of the design portion 23 and the light-shielding portion 25. Not limited to the illustrated example, the light-shielding portion 25 may be omitted.

The base material portion 21 appropriately supports the design portion 23 and the light-shielding portion 25. The base material portion 21 is a transparent film-like member. The material of the base material portion 21 may be any material as long as it is transparent and can appropriately support the design portion 23 and the light-shielding portion 25. For example, polymethyl methacrylate, polyethylene terephthalate, polyethylene naphthalate, etc. Examples thereof include polycarbonate, polystyrene, cyclic polyolefin, and ABS (acrylonitrile butadiene styrene copolymer). Further, the base material portion 21 preferably has a thickness of 10 μm or more and 500 μm or less in consideration of transparency and appropriate supportability of the design portion 23 and the light-shielding portion 25.

In addition, transparency means the transmittance at each wavelength when measured within the measurement wavelength range of 380 nm to 780 nm using a spectrophotometer (“UV-3100PC” manufactured by Shimadzu Corporation, JIS K 0115 compliant product). It means that the visible light transmittance specified as the average value of is 80% or more.

The design unit 23 forms the design displayed on the decorative sheet 20. More specifically, one design is formed by a plurality of design units 23. The design unit 23 can form a pattern such as a figure, a pattern, a design, a color, a picture, a photograph, a character, a mark, a pictogram, a character or a number as a design. For example, as a design that can be harmonized with the surrounding environment in which the display device 1 with a decorative sheet is provided, the design unit 23 may form a wood grain or marble-like pattern or geometric pattern.

The thickness of the design portion 23 is preferably 1 μm or more and 20 μm or less. When the thickness of the design portion 23 is sufficiently thick, the pattern formed by the design portion 23 can be made dark and clear. Here, the thickness of the design portion 23 is the length of the design portion 23 along the normal direction of the base material portion 21 that supports the design portion 23. Although the cross-sectional shape of the design portion 23 is rectangular in the cross section in the direction orthogonal to the sheet surface of the decorative sheet 20 as shown in FIG. 2, the cross-sectional shape is not limited to this, and may be, for example, a trapezoidal shape. good.

An enlarged front view of a part of the decorative sheet 20 is shown in FIG. As shown in FIG. 4, the plurality of design portions 23 are arranged in the third direction d3, and extend linearly, particularly linearly, in the fourth direction d4. 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 directions to the first direction d1 and the second direction d2. Preferably, the third direction d3 and the fourth direction d4 are orthogonal to each other. Further, the first direction d1 and the third direction d3 are not orthogonal 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 °. It is less than or equal to, and more preferably 15 ° or more and 35 ° or less.

The design unit 23 is arranged at an arrangement pitch p3 along the third direction d3. The arrangement pitch p3 of the design portion 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 portion 23 along the third direction d3 is constant. Further, 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.

The light-shielding portion 25 is provided so as to cover the design portion 23 from the side facing the display device 10. The light-shielding unit 25 has a function of absorbing light so that the image light from the display device 10 does not enter the design unit 23. The light-shielding portion 25 may contain, for example, light-absorbing particles in the binder resin. Examples of the light absorbing particles include black pigments such as carbon black and titanium black. It is preferable that the light-shielding portion 25 is provided only at 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. Further, when the light-shielding portion 25 having a sufficient thickness covers the design portion 23, the pattern 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.

The transmission unit 27 is provided to transmit the image light from the display device 10 to the decorative sheet 20. As shown in FIGS. 2 and 4, the transmission portion 27 is a non-forming portion of the design portion 23 and the light-shielding portion 25 when observed from the front of the decorative sheet 20. In order to sufficiently transmit the image light from the display device 10, the ratio of the area occupied by the transmitting portion 27 in the decorative sheet 20 (also referred to as the aperture ratio) is 15% or more, preferably 20% or more. More preferably, it is 25% or more. On the other hand, the area occupied by the transmissive portion 27 in the decorative sheet 20 is 50% or less, preferably 40% or less, and more preferably 30% or less so that the design displayed by the decorative sheet 20 can be easily observed. Is.

Since the transmission portion 27 is a non-forming portion of the design portion 23 and the light-shielding portion 25, as shown in FIG. 4, the transmission portion 27 is arranged in the third direction d3 and extends in the fourth direction d4. Since the design portion 23 is arranged along the third direction d3 at the arrangement pitch p3, the transmission portion 27 is also arranged along the third direction d3 at the arrangement pitch p3. Since the design portion 23 extends linearly in the fourth direction d4, the transmission portion 27 also extends linearly in the fourth direction d4. In the example shown in FIG. 4, the length w2 of each transmission portion 27 along the third direction d3, in other words, the width of the transmission portion 27 is constant along the fourth direction d4. The length w2 of the transmission portion 27 along the third direction d3 is, for example, 5 μm or more and 120 μm or less. The length w2 of the transmission portion 27 along the third direction d3 is preferably shorter than the length w1 of the design portion 23 along the third direction d3.

The transmission portion 27 may be a void as in the example shown in FIG. 2, but may be formed of, for example, a transparent resin. Such a transparent resin can effectively prevent foreign substances such as dust from entering the transmissive portion 27. Further, 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 where the base material portion 21 is provided. Such a transparent resin can form a transparent portion 27 and function as a transparent protective film that protects the design portion 23 and the light-shielding portion 25.

For example, the transmission portion 27 irradiates the design portion 23 and the light-shielding portion 25 provided on the entire surface of the base material portion 21 with a laser at a position to be formed by the transmission portion 27, and the transmission portion 27 is at a position where the laser is irradiated. It is provided by removing the design portion 23 and the light-shielding portion 25. Alternatively, by forming the design portion 23 and the light-shielding portion 25 on the base material portion 21 by printing or the like in a predetermined pattern as shown in FIG. 4, the design portion 23 and the light-shielding portion 25 are transmitted as non-formed portions. A portion 27 may be provided.

FIG. 5 is an enlarged front view showing a part of the display device 1 with a decorative sheet. As shown in FIG. 5, the arrangement pitch p3 of the design unit 23 along the third direction d3 is smaller than the arrangement pitch p1 and p2 of the pixels 13 along the first direction d1 and the second direction d2. There is. Specifically, the average of the arrangement pitch p3 of the design unit 23 along the third direction d3 is 90% or less of the arrangement pitch p1 and p2 of the pixels 13 along the first direction d1 and the second direction d2. It is preferably 70% or less. Here, the average of the arrangement pitch p3 of the design unit 23 along the third direction d3 is the design unit 23 at a certain position of the decorative sheet 20 and 20 designs continuous from the design unit 23 to the third direction d3. It can be defined by the average of the arrangement pitch p3 of the design unit 23 along the third direction d3 for the unit 23.

FIG. 6 is a front view showing a part of the display device 1 with a decorative sheet in a further enlarged manner. FIG. 6 shows an enlarged display device 1 with a decorative sheet at a position corresponding to one pixel 13. In the illustrated example, the pixel 13 is a rectangle, especially a square. It is preferable that the directions of the two diagonal lines of the rectangle of the pixel 13 and the third direction d3 are non-parallel directions. In particular, the smallest angle of the angles α and β formed by the diagonal direction of the pixel 13 and the third direction d3 is preferably 10 ° or more and 35 ° or less.

FIG. 7 is a diagram showing a viewing angle 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 portion 27 of the decorative sheet 20. The transmission 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, and is observed 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.

Next, the operation of the display device 1 with a decorative sheet according to the present embodiment will be described.

When the image is not displayed on the display surface 11 of the display device 10, as shown in FIG. 8, the display device 1 with the decorative sheet displays the design formed by the design portion 23 of the decorative sheet 20. That is, the display device 1 with a decorative sheet can display a design intended to be observed. Due to the displayed design, the display surface 11 of the display device 10 is not observed by an outside observer, and the display device 1 with a decorative sheet can be harmonized with the surrounding environment in terms of design. In particular, when the light-shielding portion 25 is provided only at a position facing the design portion 23, the light-shielding portion 25 is not observed by the observer, and the light-shielding portion 25 prevents the design of the decorative sheet 20 from being impaired. be able to.

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 portion 21 and the transmission portion 27 of the decorative sheet 20 as shown in FIG. As a result, the observer can observe the image displayed on the display surface 11. That is, the display device 1 with a decorative sheet can display an image intended to be observed, and an external observer can observe the image.

Further, 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 the image light from incident on the design portion 23. Therefore, it is possible to prevent the image light from passing through the design unit 23 and observing the design represented by the design unit 23 and the image light in a mixed manner. That is, it is possible to effectively prevent the color reproducibility of the image from being deteriorated due to the absorption of visible light in a specific wavelength range by the design unit 23. Further, when the light-shielding portion 25 is provided only in the region facing the design portion 23, the light-shielding portion 25 prevents the image light transmitted through the transmission portion 27 from being obstructed. That is, the image light can be efficiently used to display the image brightly.

By the way, as described above, in a conventional display device with a decorative sheet, moire may be observed when the display device displays an image. Moire is caused by the regular arrangement of pixels in the display device and the regular arrangement of transparent parts of the decorative sheet. More specifically, the image light emitted from the regularly arranged pixels includes periodicity due to the arrangement of the pixels. Further, the image light is emitted from the decorative sheet by passing through the transmitting portions that are regularly arranged, including the periodicity of the transmitting portions. That is, the image light emitted from the decorative sheet includes periodicity due to the arrangement of pixels and periodicity due to the arrangement of transmissive portions. When these two periodicities interfere with each other, moire (interference fringes) occurs in the observed image. Since such moire deteriorates the visibility of the image displayed on the display device, it is desired to suppress the occurrence of moire.

In order to suppress the occurrence of moiré, it is considered effective to shift the direction in which the two elements that cause interference exhibit regularity. In the display device 1 with a decorative sheet of the present embodiment, the smaller angle θ between the first direction d1 in which the pixels 13 are in the arrangement direction and the third direction d3 in which the design unit 23 is in the arrangement direction is It is 5 ° or more and 85 ° or less. Therefore, according to the display device 1 with a decorative sheet of the present embodiment, the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmissive portion 27 arranged in the third direction d3 cause interference. The generation of moire that occurs can be effectively suppressed.

Further, in order to suppress the occurrence of moire, it is considered effective to shift the arrangement pitch of the two elements that cause interference. In the display device 1 with a decorative sheet of the present embodiment, the average of the arrangement pitch p3 of the design unit 23 along the third direction d3 is the arrangement pitch p1 of the pixels along the first direction d1 and the second direction d2. It is 90% or less of p2. The transmission portion 27, which is a non-forming portion of the design portion 23, is arranged at an arrangement pitch p3. Therefore, according to the display device 1 with a decorative sheet of the present embodiment, due to the interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmissive portion 27 arranged in the third direction d3. The generation of moire that occurs can be effectively suppressed. In addition, according to such a display device 1 with a decorative sheet, each pixel 13 easily overlaps with any of the transmissive portions 27, and the image light emitted by each pixel 13 passes through any of the transmissive portions 27. It becomes easier to form an image. In other words, it is possible to effectively suppress the generation of the pixel 13 that is completely covered by the design portion 23.

Further, in the display device 1 with a decorative sheet of the present embodiment, the ratio of the area occupied by the transparent portion 27 in the decorative sheet 20 is 15% or more and 50% or less. Since the ratio of the area occupied by the transmissive portion 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. Therefore, the image displayed on the display device 10 can be clearly observed. Further, since the ratio of the area occupied by the transparent portion 27 in the decorative sheet 20 is sufficiently small, the ratio of the area occupied by the design portion 23 can be sufficiently increased. Therefore, the design formed by the design unit 23 can be clearly observed without displaying the image.

In the present embodiment, each pixel 13 is a rectangle, and the smallest angle of the angles α and β formed by 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 plurality of 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 pixel 13. Therefore, moire 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 transmission portions 27. Two elements that cause interference when the smallest angle of the angles α and β formed by the diagonal direction of the pixel 13 and the third direction d3 which is the arrangement direction of the transmission portion 27 is 10 ° or more and 35 ° or less. Will tilt the direction in which they exhibit regularity with respect to each other. Therefore, it is possible to effectively suppress the generation of moire caused by the 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.

In the present embodiment, the length w1 of the design portion 23 along the third direction d3, that is, 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 tends to overlap with the entire pixel 13. In this case, the image light from the pixel 13 does not pass through the decorative sheet 20, and a part of the image is not observed. Further, if the width of the design portion 23 is too small, the image light transmitted through the decorative sheet 20 is likely to be diffracted, and interference fringes due to diffraction are observed in the image. When the width of the design portion 23 is 10 μm or more and 150 μm or less, it is possible to effectively suppress that a part of the image is not observed, and it is possible to suppress the diffraction of the image light transmitted through the decorative sheet 20. .. As a result, deterioration of the visibility of the image can be suppressed.

In the present 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 likely to be observed from the direction inclined in the fourth direction d4 than in the direction inclined in the third direction d3. Such a display device 1 with a decorative sheet can be easily observed from the passenger seat or the like of the automobile and difficult to be observed from the driver's seat when arranged in the vehicle of the automobile, for example. Further, when such a display device 1 with a decorative sheet is applied to a display device for security, the image displayed on the display device with a decorative sheet can be easily observed from the front direction. However, it is possible to prevent peeping from the side.

As described above, the display device 1 with a decorative sheet according to the present embodiment includes the display device 10 having a plurality of pixels 13 arranged in the first direction d1 and the second direction d2 which is non-parallel to the first direction d1. The decorative sheet 20 includes a decorative sheet 20 which is arranged facing the display device 10, and the decorative sheet 20 includes a plurality of design portions 23 for forming a design and a plurality of transmissive portions which are non-formed portions of the design portion 23. 27 and the plurality of design portions 23 are arranged in the third direction d3, which is non-parallel to both the first direction d1 and the second direction d2, and in the fourth direction d4, which is non-parallel to the third direction d3. The ratio of the area extending linearly and occupied by the transparent portion 27 in the decorative sheet 20 is 15% or more and 50% or less, and the average of the arrangement pitch p3 of the design portion 23 along the third direction d3 is the first direction. It is 90% or less of the arrangement pitch p1 and p2 of the pixels 13 along the 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. According to such a display device 1 with a decorative sheet, since the two elements causing interference are shifted in the direction in which the regularity is exhibited and the arrangement pitch, the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the pixels 13 and the arrangement pitch are different. It is possible to effectively suppress the generation of moire caused by the interference between the regularity of the transmission portions 27 arranged in the third direction d3.

The display device 1 with a decorative sheet described above is used for an interior member or an exterior member of a moving body such as a vehicle such as an automobile or a railroad, an aircraft, a ship, or a spacecraft. As a specific application example, the display device 1 with a decorative sheet is used for a center console of an automobile or a door trim. Alternatively, the display device 1 with a decorative sheet may be incorporated and used in an interior member or an exterior member of a building, an electronic device, furniture, or an electric appliance.

It is possible to make various changes to the above-described embodiment.

FIG. 10 shows an enlarged front view of a part of a modification of the display device 1 with a decorative sheet. In the modification shown in FIG. 10, the length w1 of the design portion 23 along the third direction d3, that is, the width of the design portion 23 is constant, but the transmission portion 27 along the third direction d3. The length w2 of 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 portion 23 along the third direction d3 is not constant in the entire decorative sheet 20, but changes at least in a part thereof. In particular, it is preferable that the length w2 of the transmission portion 27 along the third direction d3 changes irregularly in each transmission portion 27. By changing the length w2 of the transmitting portion 27 along the third direction d3 and the arrangement pitch p3 of the design portion 23 along the third direction d3, the regularity of the image light transmitted through the transmitting portion 27 is weakened. Therefore, it is possible to effectively suppress the generation of moire caused by the interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmission portion 27 arranged in the third direction d3.

In this modification, it is preferable that the variation in the length w2 of the transmission portion 27 along the third direction d3 is not too large. Specifically, the maximum length of the transmission portion 27 along the third direction d3 may be 150% or less of the average length w2 of the transmission portion 27 along the third direction d3. It is preferably 120% or less, and more preferably 120% or less. Further, the minimum length of the length w2 of the transmission portion 27 along the third direction d3 is preferably 50% or less of the average of the length w2 of the transmission portion 27 along the third direction d3, 20 % Or less is more preferable. Here, the average of the lengths w2 of the transmissive portions 27 along the third direction d3 is the average of the 20 transmissive portions 27 continuous from the transmissive portion 27 at a certain position of the decorative sheet 20 in the third direction d3. It can be defined by the average of the lengths w2 of the transmissive portions 27 along the third direction d3.

Since the variation in the length w2 of the transmission portion 27 along the third direction d3 is not too large, the variation in the image light transmitted through each transmission portion 27 in the state where the display device 10 displays the image is reduced. Can be done. As a result, it is possible to effectively suppress the occurrence of unevenness in the observed image.

FIG. 11 shows an enlarged front view of a part of another modification of the display device 1 with a decorative sheet. In the modification shown in FIG. 11, the arrangement pitch p3 of the design portion 23 along the third direction d3 is constant, but the length w1 of the design portion 23 along the third direction d3, that is, the design. The width of the portion 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 transmission portion 27 along the third direction d3 is not constant in the entire decorative sheet 20, but changes at least in a part thereof. In particular, it is preferable that the length w1 of the design portion 23 along the third direction d3 changes irregularly in each design portion 23. By changing the length w1 of the design portion 23 along the third direction d3, the length w2 of the transmitting portion 27 along the third direction d3 changes, and the regularity of the image light transmitted through the transmitting portion 27 changes. Is weakened. Therefore, it is possible to effectively suppress the generation of moire caused by the interference between the regularity of the pixels 13 arranged in the first direction d1 and the regularity of the transmission portion 27 arranged in the third direction d3.

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 of the length w1 of the design portion 23 along the third direction d3 may be 150% or less of the average length w1 of the design portion 23 along the third direction d3. It is preferably 120% or less, and more preferably 120% or less. Further, the minimum length of the length w1 of the design portion 23 along the third direction d3 is preferably 50% or less of the average of the length w1 of the design portion 23 along the third direction d3, 20 % Or less is more preferable. Here, the average length w1 of the design portion 23 along the third direction d3 is the average of the 20 design portions 23 continuous from the design portion 23 at a certain position of the decorative sheet 20 in the third direction d3. It can be defined by the average length w1 of the design portion 23 along the third direction d3.

Since the variation in the length w1 of the design unit 23 along the third direction d3 is not too large, the variation in the color density of the design formed by the design unit 23 in the state where the display device 10 is not displaying the image is not too large. Can be made smaller. As a result, it is possible to effectively suppress the occurrence of color unevenness in the observed design.

As a matter of course, the modified example shown in FIG. 10 and the modified example shown in FIG. 11 may be combined. That is, the length w1 of the design portion 23 along the third direction d3, the length w2 of the transmission portion 27 along the third direction d3, and all of the arrangement pitch p3 of the design portion 23 along the third direction d3. May vary throughout the decorative sheet 20. Alternatively, the length w2 of the transmission portion 27 along the third direction d3 is constant, and the length w1 of the design portion 23 along the third direction d3 and the arrangement of the design portions 23 along the third direction d3. The pitch p3 may vary throughout the decorative sheet 20.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

As an example and a comparative example, the pitch p1 of the pixel arrangement along the first direction d1, the ratio of the area occupied by the transmission part in the decorative sheet (aperture ratio), and the arrangement pitch p3 of the design part along the third direction d3. A display device with a decorative sheet having different lengths w2 of the transmissive portion along the average and the third direction d3 was prepared. Further, the ratio of the average of the array pitch p3 of the design portion along the third direction d3 to the pitch p1 of the array of pixels along the first direction d1 was calculated. The angle θ formed by the first direction d1 and the third direction d3 was set to 15 °. Further, the pixels are square, and the pixel arrangement pitch p1 along the first direction d1 and the pixel arrangement pitch p2 along the second direction d2 are equal to each other.

For each Example and Comparative Example, the moire in the state where the image was displayed and the visibility of the displayed image were visually evaluated. Regarding the evaluation of moiré, those in which no moiré was visually observed were A, those in which only moiré was observed to the extent that it did not affect the visibility of the image was B, and moiré that affected the visibility of the image was observed. Those with conspicuous moiré were evaluated as C, and those with conspicuous moire were evaluated as D. Regarding the visibility of the image, A is the one in which the image is observed very clearly, B is the one in which the image is clearly observed, C is the one in which the image is observed only indistinctly, and the image is. Those observed very unclearly were rated as D.

For each example and comparative example, the pitch p1 of the pixel arrangement along the first direction d1, the ratio of the area occupied by the transmissive part in the decorative sheet (aperture ratio), and the arrangement pitch of the design part along the third direction d3. The average of p3, the length w2 of the transmissive portion along the third direction d3, the ratio of the array pitch p3 of the design portion along the third direction d3 to the pitch p1 of the array of pixels along the first direction d1. The results of the evaluation of moire and the visibility of the displayed image in the state where the image is displayed are shown in Table 1 below.

From the comparison of each embodiment and each comparative example in Table 1, the average of the arrangement pitch p3 of the design portion along the third direction d3 is 90% or less of the arrangement pitch p1 of the pixels along the first direction d1. It is understood that the generation of moire caused by the interference between the regularity of the pixels arranged in the first direction d1 and the regularity of the transmissive portion arranged in the third direction d3 can be effectively suppressed. In particular, for example, from the comparison between Example 1 and Comparative Example 5, it is effective to generate moire by the relationship between the arrangement pitch p3 of the design portion and the arrangement pitch p1 of the pixels instead of the arrangement pitch p3 of the design portion in the decorative sheet. It is understood that it can be suppressed.

Further, when the difference between the arrangement pitch p3 of the design portion in the third direction d3 and the length of the transmission portion, that is, the length of the design portion in the third direction d3 is 160 μm or more, the image is observed only indistinctly. There wasn't. It is considered that this is because a part of the image is no longer observed because the wide design part overlaps with the entire pixel and the image light from the pixel does not easily pass through the decorative sheet. Be done.

1 Display device with decorative sheet 10 Display device 11 Display surface 13 Pixel 13R 1st sub pixel 13G 2nd sub pixel 13B 3rd sub pixel 15 Black matrix 20 Decorative sheet 21 Base material 23 Design part 25 Light shielding part 27 Transmissive part

Claims (6)

A display device having a plurality of pixels arranged in a first direction and a second direction non-parallel to the first direction, and a display device having a plurality of pixels.
A decorative sheet arranged facing the display device is provided.
The decorative sheet has a plurality of design portions for forming a design and a plurality of transmissive portions which are non-forming portions of the design portion.
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 transmissive portion in the decorative sheet is 15% or more and 50% or less.
The average of the arrangement pitches of the design portions along the third direction is 90% or less of the arrangement pitches of the pixels along the first direction and the second direction.
A display device with a decorative sheet, wherein the smaller angle between the first direction and the third direction is 5 ° or more and 85 ° or less. The pixel is rectangular and
The display device with a decorative sheet according to claim 1, wherein the smallest angle between the diagonal direction of the pixel and the third direction is 10 ° or more and 35 ° or less. The display device with a decorative sheet according to claim 1 or 2, wherein the length of the design portion along the third direction is 10 μm or more and 150 μm or less. The length of the permeation along the third direction is different from the length of at least one other permeation along the third direction.
The maximum length of the transmission portion along the third direction is 150% or less of the average length of the transmission portion along the third direction.
Any one of claims 1 to 3, wherein the minimum length of the transmission portion along the third direction is 50% or less of the average length of the transmission portion along the third direction. Display device with decorative sheet described in item 1. 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 length of the design portion along the third direction is 50% or less of the average length of the design portion along the third direction, according to claims 1 to 4. The display device with a decorative sheet according to any one of the items. The display device with a decorative sheet according to any one of claims 1 to 5, wherein the viewing angle of the image displayed on the display device in the third direction is smaller than the viewing angle in the fourth direction.

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