JP6354896B2 - Display device - Google Patents

Description

  The present invention relates to a display device that displays image light to an observer.

2. Description of the Related Art Conventionally, there has been proposed a head-mounted display device, so-called head mounted display (HMD), that allows an observer to observe an image from an image source such as an LCD (Liquid Crystal Display) or an organic EL display through an optical system. (For example, patent document 1). Such a head-mounted display device enlarges image light projected from an image source by an optical system such as a lens and displays a clear image on the viewer side.
Here, the video source used in such a display device is provided with a plurality of pixel areas constituting the video and non-pixel areas that are provided between the pixel areas and do not contribute to video display. When the image light emitted from such an image source is enlarged by a lens, not only the image constituted by the pixel area, but also the non-image area caused by the non-pixel area is enlarged, and only the image is obtained. In some cases, the non-video area may be visually recognized by the observer, which may hinder the display of a clear video.

Special table 2011-509417 gazette

  The subject of this invention is providing the display apparatus which can suppress that the non-video area | region resulting from the non-pixel area | region which exists between the pixels of a video source originates.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
According to a first aspect of the present invention, there is provided an image source (11) for emitting image light (L) from a plurality of arranged pixel regions, a lens (12) for enlarging and emitting the image light to an observer side, and the image source And an optical sheet (20) disposed between the lenses or on the viewer side of the lens, and the optical sheet has at least two or more optical layers (21, 22, 23), A plurality of convex shapes (21a, 23a) are formed at the interface between the optical layers, the viewer side surface and the image source side surface are formed flat, and the light incident from the image source is refracted by the convex shape; A display device (1) characterized by the following.
According to a second aspect of the present invention, in the display device (1) of the first aspect, the convex shape (21a, 23a) is a sheet surface (XZ surface) orthogonal to the thickness direction (Y direction) of the optical sheet (20). Extending in the first direction (Z direction, X direction) and arranged in a second direction (X direction, Z direction) perpendicular to the first direction in the sheet surface, The display device is characterized in that a cross-sectional shape in a cross section parallel to the thickness direction and parallel to the second direction is formed in a substantially arc shape.
A third invention is characterized in that, in the display device of the second invention, the first direction of the convex shape (21a, 23a) is inclined with respect to the observer's vertical direction or horizontal direction. Display device.
According to a fourth invention, in the display device (1) of the second invention or the third invention, the optical sheet (20) has three or more optical layers, and is provided at each interface between the optical layers. The extending directions (Z direction, X direction) in the sheet surface (XZ plane) of the convex shapes (21a, 23a) thus intersected when viewed from the thickness direction (Y direction) of the optical sheet. The display device characterized by the above.
According to a fifth invention, in any one of the display devices (1) from the second invention to the fourth invention, the curvature radius in the cross section of the convex shape (21a, 23a) is R, and the convex shape The display device is characterized in that 0.05 ≦ P / R ≦ 1.0 is satisfied, where P is the arrangement pitch in the second direction.
According to a sixth invention, in any one of the display devices (1) from the first invention to the fifth invention, the difference Δn in refractive index between the optical layers adjacent to each other is 0.005 ≦ Δn ≦ 0.1. It is a display device characterized by satisfying.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the non-image area | region which originates in the non-pixel area | region which exists between the pixels of an image source becomes visible.

It is a figure explaining the structure of the head-mounted display apparatus of embodiment. It is a figure explaining the detail of the optical sheet used for the display apparatus of embodiment. It is a figure which shows the relationship between the brightness | luminance and viewing angle of the optical sheet used for the display apparatus of embodiment. It is a figure which shows the example of the image displayed by the display apparatus of embodiment. It is a figure explaining the structure etc. of the display apparatus of a comparative example. It is a figure explaining the deformation | transformation form of the optical sheet used for a display apparatus.

Embodiments of the present invention will be described below with reference to the drawings. In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.
Numerical values such as dimensions and material names of the respective members described in the present specification are examples of the embodiment, and the present invention is not limited thereto, and may be appropriately selected and used.
In this specification, terms that specify shape and geometric conditions, for example, terms such as parallel and orthogonal, are strictly meanings, have similar optical functions, and can be regarded as parallel and orthogonal It also includes a state having an error of.

(Embodiment)
FIG. 1 is a diagram illustrating a head-mounted display device 1 according to this embodiment. FIG. 1 is a view of the display device 1 as viewed from above in the vertical direction.
FIG. 2 is a diagram illustrating details of the optical sheet used in the display device of the embodiment. Fig.2 (a) is sectional drawing in a cross section parallel to the horizontal surface of an optical sheet, FIG.2 (b) is b section sectional drawing of Fig.2 (a). FIG. 2C is a diagram showing details of the portion c in FIG. 2A, and FIG. 2D is a diagram showing details of the portion d in FIG. 2B.
FIG. 3 is a diagram illustrating the relationship between the luminance and the viewing angle of the optical sheet used in the display device of the embodiment.
FIG. 4 is a diagram illustrating an example of an image displayed by the display device according to the embodiment.
FIG. 5 is a diagram illustrating a display device of a comparative example. FIG. 5A is a diagram for explaining the configuration of the display device of the comparative example, and corresponds to FIG. FIG. 5B is a diagram illustrating an example of an image displayed by the display device of the comparative example.

  In addition, in the figure shown below including FIG. 1 and the following description, in order to make an understanding easy, in a state where the viewer wears the display device 1 on the head, the vertical direction is the Z direction, and the horizontal direction is Let it be X direction and Y direction. Of these horizontal directions, the thickness direction of the optical sheet is defined as the Y direction, and the left-right direction orthogonal to the thickness direction is defined as the X direction. The −Y side in the Y direction is the observer side, and the + Y side is the back side.

The display device 1 is a so-called head mounted display (HMD) that an observer wears on the head and displays an image in front of the eyes of the observer. As shown in FIG. 1, the head-mounted display device 1 of the present embodiment includes an image source 11, a lens 12, and an optical sheet 20 inside an eyeglass frame (not shown), and an observer By mounting the spectacle frame on the head, the image light displayed on the image source 11 can be visually recognized by the observer's eye E through the optical sheet 20 and the lens 12. In FIG. 1, the display device 1 is described with respect to an example in which the display device 1 is arranged with respect to the eye E on one side of the observer. However, the display device 1 is not limited thereto, and is arranged in each of both eyes of the observer. You may make it do.
The video source 11 is a micro display that displays video light. For example, a transmissive liquid crystal display device, a reflective liquid crystal display device, an organic EL, or the like can be used. As the video source 11 of this embodiment, for example, an organic EL display having a diagonal of 5 inches is used.
The lens 12 is a convex lens that enlarges the image light emitted from the image source 11 and emits the image light to the observer side. In the present embodiment, the lens 12 is arranged on the most observer side (−Y side) of the display device 1. .

As shown in FIG. 1, the optical sheet 20 is disposed between the image source 11 and the lens 12 and in a position close to the lens 12, and diffuses the image light emitted from the image source 11 slightly. A light-transmitting sheet having
Here, a head-mounted display device that has been mainly used conventionally (hereinafter referred to as a display device of a comparative example) does not include the above-described optical sheet as shown in FIG. Yes, the image light emitted from the image source is magnified by the lens and displayed on the viewer side. Here, a display such as an organic EL used as a video source has a plurality of pixel areas that form an image on the display unit, and a non-pixel area that does not contribute to the formation of an image between the pixel areas. Is provided. Therefore, when the image light emitted from the image source is magnified through the lens, as shown in FIG. 5B, not only the image by the pixel region but also the non-image region caused by the non-pixel region In other words, not only the video but also the non-video area is visually recognized by the observer, which may hinder clear video display.
Therefore, as described above, the optical sheet 20 is provided in the display device 1 of the present embodiment, and the image light emitted from the image source 11 is slightly diffused and diffused as shown in FIG. It is possible to suppress the non-image area caused by the non-pixel area from being visually recognized by the observer due to the image light.

As shown in FIG. 2, the optical sheet 20 is formed by laminating a first optical layer 21, a second optical layer 22, and a third optical layer 23 in order from the back side (+ Y side). The optical sheet 20 has a plurality of convex shapes 21 a and convex shapes 23 a formed on the interface between the first optical layer 21 and the second optical layer 22 and on the interface between the second optical layer 22 and the third optical layer 23. Yes.
The first optical layer 21 is a light-transmitting layer located on the most back side (+ Y side) of the optical sheet 20, and the back side surface is a surface on which video light emitted from the video source 11 is incident. And is substantially flat. A plurality of convex shapes 21 a are formed on the surface of the first optical layer 21 on the viewer side (−Y side) as shown in FIG. This convex shape 21a extends in the vertical direction (Z direction) along the surface on the viewer side of the first optical layer 21, and is arranged in the left and right direction (X direction). This is a lenticular lens shape in which a cross-sectional shape on a plane parallel to the thickness direction (XY plane) is formed in a substantially arc shape. Here, the “substantially arc shape” means not only a perfect circular arc but also a curved shape including a part such as an ellipse or an ellipse.

The third optical layer 23 is a light-transmitting layer located on the most observer side (−Y side) of the optical sheet 20, and the image light transmitted through the optical sheet 20 is emitted from the surface on the observer side. And is formed to be substantially flat. On the back side (+ Y side) surface of the third optical layer 23, as shown in FIG. 2B, a plurality of convex shapes 23a are formed. This convex shape 23a extends in the left-right direction (X direction) along the back surface of the third optical layer 23, and is arranged in a plurality in the vertical direction (Z direction). This is a lenticular lens shape in which a cross-sectional shape on a plane parallel to the direction (YZ plane) is formed in a substantially arc shape.
That is, the extending direction (X direction) of the convex shape 23a provided in the third optical layer 23 intersects the extending direction (Z direction) of the convex shape 21a provided in the first optical layer 21 described above. (Orthogonal).
The second optical layer 22 is a light-transmitting layer provided between the first optical layer 21 and the third optical layer 23, the surface of the first optical layer 21 on the convex shape 21a side, and the third optical layer. 23 are arranged so as to face each other on the surface on the convex shape 23a side.

The optical sheet 20 of the present embodiment has a half-value angle α satisfying 0.05 ° ≦ α ≦ 0.2 °, and a viewing angle β at which the maximum luminance is 1/20 satisfies β ≦ 5 × α. Is formed. Here, as shown in FIG. 3, the half-value angle α of the optical sheet 20 refers to the light in the horizontal direction of the screen and the vertical direction of the screen from the observation position of the sheet surface of the optical sheet 20 where the luminance of the light reaches the maximum value. An observation angle at which the luminance is half the maximum value. In addition, the viewing angle β is an observation in which the luminance of light is 1/20 of the maximum value in the horizontal direction of the screen and the vertical direction of the screen from the observation position on the sheet surface of the optical sheet 20 where the luminance of the light has the maximum value. An angle.
Further, the optical sheet 20 of the present embodiment has a refractive index difference between adjacent layers, that is, a refractive index difference Δn1 between the first optical layer 21 and the second optical layer 22, and a second optical layer 22 and a third optical layer 23. Are formed so as to satisfy 0.005 ≦ Δn1 ≦ 0.1 and 0.005 ≦ Δn2 ≦ 0.1, respectively.

As described above, by defining the range of the half-value angle α and the viewing angle β of the optical sheet 20 and the range of the refractive index difference (Δn1, Δn2) between the layers adjacent to each other, the display device 1 of the present embodiment. Can slightly diffuse the image light emitted from the image source 11 in the vertical direction and the left-right direction. As a result, the display device 1 displays a clear image on the viewer side and suppresses the non-image region caused by the non-pixel region of the image source 11 from being noticeable due to the minute diffusion of the image light. Can do.
From the viewpoint of more effectively achieving the above-described effects, it is more desirable that the viewing angle β of the optical sheet 20 is equal to or close to the half-value angle α.

If the half-value angle α is less than 0.05 °, the range in which light is diffused by the optical sheet becomes too narrow, and the non-image area caused by the non-pixel area cannot be made inconspicuous. Not desirable. On the other hand, when the half-value angle α is larger than 0.2 °, the range in which the image light is diffused becomes too wide, which is not desirable because the sharpness of the image is lowered.
Also, if the viewing angle β is larger than 5 × α, the range in which the low-brightness video light is diffused becomes too wide, which is not desirable because the sharpness of the video is reduced.
Furthermore, when the refractive index difference (Δn1, Δn2) between adjacent layers is less than 0.005, the refractive index difference between the layers becomes too small, and the refraction of the image light between the layers becomes difficult to occur. This is not desirable because a sufficient diffusion effect is not exhibited. Further, when the refractive index difference (Δn1, Δn2) between adjacent layers is larger than 0.1, the refraction of light between the layers becomes too large, and the image light transmitted through the optical sheet becomes unclear. So undesirable.

The first optical layer 21 and the third optical layer 23 are each formed of a highly light-transmitting PC (polycarbonate) resin, MS (methyl methacrylate / styrene) resin, acrylic resin, and the like. In this embodiment, Both the first optical layer 21 and the third optical layer 23 are made of the same material and have the same refractive index.
Further, the second optical layer 22 is made of a highly light transmissive urethane acrylate resin, an ultraviolet curable resin such as an epoxy acrylate resin, or the like. In the present embodiment, the first optical layer 21 and the third optical layer are used. The refractive index is lower than the refractive index of 23.
When the cross-sectional shape of the convex shape 21a in the XY cross section is formed in an arc shape, as shown in FIG. 2C, the left-right direction (X direction) of the convex shape 21a formed in the first optical layer 21. The convex pitch 21a is formed in the range of 0.05 ≦ P1 / R1 ≦ 1.0, where P1 is the arrangement pitch in R and the radius of curvature of the arc-shaped cross-sectional shape in the XY cross section of the convex shape 21a is R1. Is desirable.
Similarly, when the cross-sectional shape of the convex shape 23a in the YZ cross section is formed in an arc shape, as shown in FIG. 2 (d), the vertical direction of the convex shape 23a formed on the third optical layer 23 (Z Direction) is P2, and the curvature radius of the arc-shaped cross-sectional shape in the YZ cross section of the convex shape 23a is R2, the convex shape 23a has a range of 0.05 ≦ P2 / R2 ≦ 1.0. It is desirable to be formed.

In this way, by forming the arrangement pitch and the radius of curvature of the convex shapes 21a and the convex shapes 23a in the above-described range, the display device 1 can efficiently and uniformly distribute the video light emitted from the video source 11 in the vertical and horizontal directions. Can be diffused slightly.
The optical sheet 20 of the present embodiment is formed such that the convex shape 21a and the convex shape 23a are the same shape, that is, P1 = P2 and R1 = R2.

Next, an operation until the video light L emitted from the video source 11 reaches the observer's eye E will be described.
As shown in FIG. 1, the image light L emitted from the image source 11 is incident on the back side (+ Y side) surface of the optical sheet 20. Then, the image light L incident on the optical sheet 20 is transmitted through the first optical layer 21, and in the left-right direction (X direction) by the convex shape 21 a at the interface between the first optical layer 21 and the second optical layer 22. It diffuses slightly and passes through the second optical layer 22.
The image light L transmitted through the second optical layer 22 is slightly diffused in the vertical direction (Z direction) by the convex shape 23a formed at the interface between the second optical layer 22 and the third optical layer 23, and the third The light passes through the optical layer 23 and is emitted from the surface on the viewer side (−Y side) of the optical sheet 20.
Subsequently, the image light L emitted from the surface on the viewer side of the optical sheet 20 enters the lens 12 and exits toward the eye E of the viewer. Here, the image light L emitted from the image source 11 is slightly diffused in the left-right direction and the vertical direction by the optical sheet 20. Therefore, even if the image light L is magnified by the lens 12, the image visually recognized by the eye E of the observer is compared with the display device of the comparative example as shown in FIG. As shown in FIG. 5B, the non-image area caused by the non-pixel area of the image source 11 can be suppressed as much as possible, and a clear image can be displayed.

Next, the manufacturing method of the optical sheet 20 used for the display apparatus 1 of this embodiment is demonstrated.
As described above, the convex shapes 21a and the convex shapes 23a provided on the first optical layer 21 and the third optical layer 23 of the optical sheet 20 are formed in the same shape. Using a mold provided with a corresponding concave shape, a sheet-like member having a convex shape is formed by an extrusion molding method, an injection molding method, or the like.
Then, the sheet-like member on which the convex shape is formed is cut into a predetermined dimension, and the first optical layer 21 and the third optical layer 23 are obtained. Thus, when the convex shape 21a and the convex shape 23a are formed in the same shape, the 1st optical layer 21 and the 3rd optical layer 23 can be cut out simultaneously from one sheet-like member, Manufacturing efficiency can be improved.
Subsequently, a resin for forming the second optical layer 22 is filled on the surface of the first optical layer 21 on the convex shape 21a side, and the resin and the surface of the third optical layer 23 on the convex shape 23a side are pasted. In addition, the resin is cured in a state where a predetermined distance is provided between the first optical layer 21 and the third optical layer 23. At this time, the first optical layer 21 and the third optical layer 23 are arranged such that the extending direction of the convex shape 21a and the extending direction of the convex shape 23a intersect (orthogonal) each other.
Thus, the optical sheet 20 in which the first optical layer 21, the second optical layer 22, and the third optical layer 23 are sequentially laminated is completed.

  As described above, the display device 1 of the present embodiment includes the optical sheet 20 having a layer configuration of at least two layers, and a plurality of fine convex shapes formed at the interface between the layers, and the optical sheets 20 are adjacent to each other. The refractive index differences Δn1 and Δn2 of the layers satisfy 0.005 ≦ Δn1 ≦ 0.1 and 0.005 ≦ Δn2 ≦ 0.1, respectively, and the half-value angle α satisfies 0.05 ° ≦ α ≦ 0.2 °. The viewing angle β of the optical sheet 20 having a maximum luminance of 1/20 is formed so as to satisfy β ≦ 5 × α. Thereby, the display device 1 can slightly diffuse the image light emitted from the image source 11 in the vertical direction and the left-right direction, display a clear image on the viewer side, and also display the non-pixel region of the image source 11. It is possible to suppress the non-video region causing the occurrence of visual recognition by the observer.

  Further, in the display device 1 of the present embodiment, the convex shape 21a extends in the Z direction (first direction) in the sheet surface (XZ plane) orthogonal to the thickness direction (Y direction) of the optical sheet 20, A cross section in an X direction (second direction) orthogonal to the Z direction in the sheet surface, in a cross section (XY plane) parallel to the thickness direction of the optical sheet 20 and parallel to the X direction (second direction). The shape is formed in a substantially arc shape. Similarly, the convex shape 23a extends in the X direction in the sheet surface (XZ surface) orthogonal to the thickness direction (Y direction) of the optical sheet 20, and is arranged in the Z direction orthogonal to the X direction in the sheet surface. The cross-sectional shape in a cross section (YZ plane) parallel to the thickness direction of the optical sheet 20 and parallel to the Z direction is formed in an arc shape. Thereby, the display device 1 can efficiently and evenly diffuse the image light passing through the convex shape.

  Furthermore, in the display device 1 of the present embodiment, the optical sheet 20 has a layer configuration of three or more layers, and the convex shape 21a and the convex shape 23a provided at each interface between the layers extend in the sheet plane. The directions (Z direction, X direction) are orthogonal (intersect) when viewed from the thickness direction of the optical sheet 20. Thereby, the display apparatus 1 can diffuse the image light emitted from the image source 11 in a plurality of directions (left and right directions and vertical directions), and more non-image areas caused by the non-pixel areas of the image source 11 can be obtained. It can be effectively inconspicuous.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made as in the modifications described later, and these are also included in the present invention. Within the technical scope. In addition, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. It should be noted that the above-described embodiment and modifications described later can be used in appropriate combination, but detailed description thereof is omitted.

(Deformation)
FIG. 6 is a diagram for explaining a modification of the optical sheet used in the display device.
(1) In the above-described embodiment, the optical sheet 20 has an example in which the first optical layer 21, the second optical layer 22, and the third optical layer 23 are sequentially stacked. It is not limited to this. For example, as shown in FIG. 6, the optical sheet 20 may have a configuration in which two layers of a first optical layer and a second optical layer are laminated, or have a layer configuration of four or more layers. May be.

(2) In the above-described embodiment, an example in which a lenticular lens shape is formed at the interface of each layer of the optical sheet 20 is shown, but the present invention is not limited to this. For example, as shown in FIG. 6, the optical sheet 120 has a two-layer structure of a first optical layer 121 and a second optical layer 122, and a fine convex shape is randomly formed between the first optical layer 121 and the second optical layer 122. It may be provided. Even in this case, the image light emitted from the image source can be slightly diffused by the optical sheet 120, and the display device can make the non-image region caused by the non-pixel region of the image source 11 inconspicuous. it can. Further, in this case, the layer configuration can be reduced as compared with the optical sheet used in the display device of the above-described embodiment, and the optical sheet can be reduced in thickness or weight.

(3) In the above-described embodiment, an example in which the optical sheet 20 is disposed between the video source 11 and the lens 12 will be described. However, the present invention is not limited to this, and the viewer side (−Y side) of the lens 12 is not limited thereto. ) May be arranged. Even in such a form, the display device 1 causes the image light emitted from the image source 11 to be slightly diffused after being magnified by the lens 12, so that the non-image area caused by the non-pixel area of the image source 11 is conspicuous. Without it, video can be displayed. In this case, since the surface on the observer side of the lens can be covered with the optical sheet, the lens can be protected by the optical sheet.

(4) In the above-described embodiment, the optical sheet 20 has an example in which the first optical layer 21 is disposed on the back side and the third optical layer 23 is disposed on the viewer side. Instead of this, the first optical layer 21 may be disposed on the viewer side, and the third optical layer 23 may be disposed on the back side.

(5) In the above-described embodiment, in the optical sheet 20, the extending direction of the convex shape 21a is the vertical direction (Z direction), and the extending direction of the convex shape 23a is the left-right direction (X direction). Although an example of orthogonality has been described, the present invention is not limited to this. For example, the extending direction of the convex shape 21a of the optical sheet 20 is a direction inclined by 45 ° with respect to the left-right direction, and the extending direction of the convex shape 23a is a direction inclined at −45 ° with respect to the left-right direction. The extending direction of each convex shape may be set as appropriate according to the arrangement of the pixels of the video source 11 or the like.
Further, the extending direction of one convex shape may intersect with the extending direction of the other convex shape at an angle other than orthogonal.

(6) In the above-described embodiment, the optical sheet 20 has been described as an example in which the refractive indexes of the first optical layer 21 and the third optical layer 23 are higher than the refractive index of the second optical layer 22, but the present invention is not limited thereto. For example, the refractive index of the first optical layer 21 and the third optical layer 23 may be lower than the refractive index of the second optical layer 22.

(7) In the above-described embodiment, the example in which the second optical layer 22 is a layer made of an ultraviolet curable resin has been shown. However, the present invention is not limited to this. For example, a permeable adhesive The first optical layer 21 and the third optical layer 23 may be bonded together. In this case, the refractive index of the pressure-sensitive adhesive constituting the second optical layer 22 has a refractive index difference of 0.005 or more and 0.1 or less with respect to the refractive indexes of the first optical layer 21 and the third optical layer 23. Must be set in range.

DESCRIPTION OF SYMBOLS 1 Display apparatus 11 Image source 12 Lens 20 Optical sheet 21 1st optical layer 21a Convex shape 22 2nd optical layer 23 3rd optical layer 23a Convex shape E Eye of an observer

Claims (7)

An image source for emitting image light from a plurality of arranged pixel regions;
A lens that magnifies and emits the image light to the viewer side;
A resinous optical sheet disposed between the image source and the lens or on the viewer side of the lens,
The optical sheet has a refractive index possess on at least two or more layers of uniform optical layer, the refractive index of adjacent optical layers are different from each other, a convex shape is more formed at the interface of each of said optical layers, observed surface and the surface of the image source side finisher side is formed flat, the light incident from the image source can be more refracted only in the interface formed in the convex shape,
A display device. The display device according to claim 1,
The convex shape extends in a first direction in a sheet surface orthogonal to the thickness direction of the optical sheet, and is arranged in a second direction orthogonal to the first direction in the sheet surface, and the optical The cross-sectional shape in a cross section parallel to the thickness direction of the sheet and parallel to the second direction is formed in a substantially arc shape,
A display device. The display device according to claim 2,
The first direction of the convex shape is inclined with respect to the vertical direction or horizontal direction of the observer;
A display device. The display device according to claim 2 or 3,
The optical sheet has three or more optical layers, and the extending direction in the sheet surface of the convex shape provided at each interface between the optical layers intersects when viewed from the thickness direction of the optical sheet. Doing things,
A display device. In the display device according to any one of claims 2 to 4,
When the radius of curvature in the cross section of the convex shape is R and the arrangement pitch of the convex shape in the second direction is P,
Satisfy 0.05 ≦ P / R ≦ 1.0,
A display device. An image source for emitting image light from a plurality of arranged pixel regions;
A lens that magnifies and emits the image light to the viewer side;
An optical sheet disposed between the image source and the lens or on the viewer side of the lens;
The optical sheet has three or more optical layers, a plurality of convex shapes are formed at each interface between the optical layers, a viewer-side surface and an image-source-side surface are formed flat, and the image source Refract the light incident from the convex shape,
The convex shape extends in a first direction in a sheet surface orthogonal to the thickness direction of the optical sheet, and is arranged in a second direction orthogonal to the first direction in the sheet surface,
The extending direction in the sheet surface of the convex shape provided at each interface between the optical layers intersects when viewed from the thickness direction of the optical sheet,
A display device. The display device according to any one of claims 1 to 6 ,
The refractive index difference Δn of the optical layers adjacent to each other satisfies 0.005 ≦ Δn ≦ 0.1;
A display device.

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