JP2018066871A - Optical sheet, display device and array type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical sheet with improved picture quality.SOLUTION: An optical sheet 20 is to be disposed on a light-exiting surface 10a side of a display part 10 where a plurality of light-emitting elements 11 for emitting light is disposed, and the sheet includes: a sheet body 21 having a first surface 21a where light emitted by the light-emitting element 11 enters and a second surface 21b where the light exits, and having a plurality of pixel regions 25 disposed thereon, respectively corresponding to the plurality of light-emitting elements 11; a plurality of diffusion parts 23 disposed on the sheet body 21 for diffusing light entering from the first surface 21a; a light-shielding part 24 disposed between adjoining pixel regions 25 on the sheet body 21; and a joining layer 22 disposed on the second surface side of the sheet body 21, having light-transmitting property and a refractive index equal to that of the sheet body 21, and joining the sheet body 21 and the light-exiting surface 10a of the display part 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical sheet, a display device, and an array type display device.

  An LED display device in which a plurality of LEDs (light emitting diodes) are arranged on a substrate is used as a display device with high brightness and a large screen. In this LED display device, pixels composed of one LED are arranged at a narrow interval of about several mm. However, since the LED emits bright light with strong directivity, the black space between the pixels is conspicuous and the image has a low resolution. May appear. In view of this, there has been disclosed a display device that reduces the amount of black space between pixels by deflecting light emitted from an LED into parallel light and then diffusing it with an optical sheet (see Patent Document 1).

Special table 2008-503034 gazette

  In the display device, although the amount of black space between pixels is reduced, the black space between pixels is still conspicuous. Therefore, in the LED display device, it is required to improve the image quality by making the black space between the pixels less noticeable.

  An object of the present invention is to provide an optical sheet, a display device, and an array type display device that further improve image quality.

The present invention solves the 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. In addition, the configuration described with reference numerals may be improved as appropriate, or at least a part thereof may be replaced with another configuration.
1st invention is an optical sheet arrange | positioned at the emission surface side of the display part in which the several light emitting element which emits light was provided, Comprising: 1st surface (21a) in which the light emitted from the said light emitting element injects ) And a second surface (21b) from which light is emitted, a sheet body (21) provided with a plurality of pixel regions (25) corresponding to each of the plurality of light emitting elements, and provided on the sheet body. A plurality of diffusion parts (23) for diffusing light incident from the first surface; a light shielding part (24) disposed between adjacent pixel regions in the sheet body; and the second part of the sheet body. An optical sheet (20) provided on the surface side, having a light transmittance and a refractive index equivalent to that of the sheet body, and comprising a bonding layer (22) for bonding the sheet body and the emission surface of the display unit. ).
The second invention is the optical sheet of the first invention, wherein the thickness of the optical sheet is H, and the distance between the centers of adjacent pixels (25) is P. 50 ° <90 ° -arc An optical sheet (20) characterized by satisfying tan (H / (P / 2)) <70 °.
A third invention is the optical sheet of the first or second invention, wherein a plurality of the diffusion parts (23) are discretely arranged on the sheet body (21). It is an optical sheet (20).
4th invention is an optical sheet of 3rd invention, Comprising: The said several diffusion part (23) is arrange | positioned at the said 2nd surface (21b) side of the said sheet | seat main body (21), An optical sheet (20) characterized by
A fifth invention is the optical sheet according to any one of the first to fourth inventions, wherein the light shielding portion (24) extends along a thickness direction of the sheet main body (21), and is a side surface. The optical sheet (20) is provided with a light reflecting layer or a light absorbing layer.
A sixth invention is a display device comprising: the optical sheet (20) of any one of the first to fifth inventions; and a display unit (10) provided with a plurality of light emitting elements (11) that emit light. (1).
A seventh invention is an array type display device comprising a plurality of the display devices (1) of the sixth invention, wherein the display devices are installed such that the side surfaces of the display devices face each other with a gap therebetween. An array type display device (100) comprising a light guide (200) for emitting light reaching the side surface of the optical sheet (20) from the side surface to the observation side through the gap. .
The eighth invention is the array type display device of the seventh invention, wherein the light guide section (200) includes a first inclined surface (211) and a second inclined surface (212) facing the first inclined surface. The array type display device (100) is characterized by comprising a plurality of unit optical shape portions (210) composed of
A ninth aspect of the invention is the array type display device of the eighth aspect of the invention, wherein the unit optical shape portion (210) is formed from the first surface (21a) side of the optical sheet (20) to the second surface ( 21b) The array type display device (100) is characterized in that the height gradually decreases toward the side 21b).

  According to the present invention, it is possible to provide an optical sheet, a display device, and an array type display device that have improved image quality.

It is a disassembled perspective view of the display apparatus 1 of embodiment. 3 is a partial cross-sectional view of the display device 1. FIG. 3 is a plan view of the display unit 10. FIG. 2 is a plan view of an optical sheet 20. FIG. 2 is a plan view of the display device 1 in which a display unit 10 and an optical sheet 20 are superimposed. FIG. 1 is an external view of an array type display device 100. FIG. It is the XX sectional view taken on the line of FIG. It is a figure explaining other embodiment of the light guide part.

Hereinafter, embodiments of the present invention will be described. In the drawings attached to the present specification, the shape, scale, vertical / horizontal dimension ratio, etc. of each part are changed or exaggerated from the actual ones in consideration of ease of understanding and the like. In the drawings, hatching indicating a cross section of the member is appropriately omitted.
In the present specification and the like, the terms specifying the shape, geometric conditions, and the degree thereof, such as “parallel”, “orthogonal”, “direction”, etc. It includes an area that exhibits an optical function and can be regarded as substantially parallel, substantially orthogonal, and the like, and a range that can be regarded as the direction thereof.

FIG. 1 is an exploded perspective view of the display device 1 of the present embodiment. FIG. 2 is a partial cross-sectional view of the display device 1. FIG. 2 shows a part of a cross section parallel to the ZY plane of the display device 1 shown in FIG. FIG. 3 is a plan view of the display unit 10. FIG. 4 is a plan view of the optical sheet 20. FIG. 5 is a plan view of the display device 1 in which the display unit 10 and the optical sheet 20 are overlaid.
In each figure, two directions parallel to the screen of the display device 1 and orthogonal to each other are defined as an X (X1-X2) direction and a Y (Y1-Y2) direction, and a direction orthogonal to the screen is defined as a Z direction. To do. In the Z (Z1-Z2) direction, the Z1 side is the back side, and the Z2 side is the observation side.

  As shown in FIG. 1, the display device 1 includes a display unit 10 and an optical sheet 20. The display device 1 of the present embodiment diffuses various information (for example, characters, figures, patterns, patterns, etc.) formed by light emitted from the display unit 10 with the optical sheet 20 and displays the information on the observation side as an image. Device.

  As shown in FIG. 2, the display unit 10 is a macro LED array in which a plurality of LEDs 11 that emit light are embedded in an emission surface 10 a on the observation side (Z2 side). The LED 11 is a light emitting element that emits one of red, green, and blue, and each color is regularly arranged. As shown in FIG. 3, the LEDs 11 are arranged at equal intervals in the X and Y directions orthogonal to each other on the emission surface 10a. In FIG. 3, the range indicated by the two-dot chain line is the range of the pixel region 25 corresponding to the LED 11 when superimposed on the optical sheet 20 via the bonding layer 22 (described later) on the emission surface 10 a of the display unit 10. (Hereinafter, a region corresponding to the pixel region 25 in the display device 1 is also referred to as a “pixel”). Although not shown, a black light absorption layer that suppresses reflection of light is formed on the entire surface of the emission surface 10 a of the display unit 10.

  The optical sheet 20 is an optical member that is disposed on the emission surface 10 a side of the display unit 10. The optical sheet 20 has a function of emitting light emitted from the display unit 10 from the second surface 21b (described later) serving as an emission surface to the observation side (Z2 side) while guiding light in the light guide direction (described later).

As shown in FIG. 2, the optical sheet 20 includes a sheet main body 21, a bonding layer 22, a diffusion part 23, and a light shielding part 24.
The sheet body 21 is a sheet-like transparent member having a first surface 21a and a second surface 21b opposite to the first surface 21a. The first surface 21a is a surface on which light emitted from the LED 11 (display unit 10) is incident. The second surface 21b is a surface from which light incident on the sheet main body 21 is emitted.

  As shown in FIG. 2, the second surface 21 b of the sheet main body 21 is mixed with a diffusion portion 23 (described later) and a region without the diffusion portion 23. Of the light incident from the first surface 21a of the sheet main body 21, light whose incident angle with respect to the second surface 21b is less than the critical angle is diffused by the diffusing unit 23, and from the second surface 21b to the observation side (Z side). Exit. In addition, the light is refracted by the second surface 21b and exits to the observation side in a region where the diffusion portion 23 is not provided.

On the other hand, of the light incident on the sheet main body 21, the light whose incident angle with respect to the first surface 21a is equal to or greater than the critical angle is totally reflected on the first surface 21a toward the second surface 21b. Since the first surface 21a and the second surface 21b are parallel in the thickness direction (Z direction) of the sheet main body 21, the light whose incident angle with respect to these surfaces is greater than the critical angle is the first surface 21a and the second surface 21b. While repeating total reflection with the surface 21b, the light is guided in a surface direction (XY plane) that is a light guide direction. A part of the light guided in the light guide direction is diffused by the diffusion unit 23 and is emitted from the second surface 21b to the observation side.
The sheet body 21 is formed of, for example, an acrylic resin, a polycarbonate resin, or the like. The thickness of the sheet body 21 is preferably in the range of 0.3 to 5 mm, for example.

The bonding layer 22 is a layer that bonds between the emission surface 10 a of the display unit 10 and the first surface 21 a of the sheet body 21. For example, the bonding layer 22 is formed of a transparent adhesive sheet, a transparent adhesive, or the like. The thickness of the bonding layer 22 is preferably in the range of 10 to 50 μm, for example. Note that the bonding layer 22 may not be transparent and may be colored as long as the light transmittance is 80% or more, for example.
The refractive index of the bonding layer 22 is preferably equal to that of the sheet body 21. By making the refractive index of the bonding layer 22 equal to that of the sheet main body 21, the refraction of light incident on the first surface 21 a of the sheet main body 21 from the bonding layer 22 can be reduced, and the light can travel more straight.

  As will be described later, in the display device 1 according to the present embodiment, the thickness H of the optical sheet 20 and the XY direction of the display unit 10 are diffused in the sheet body 21 in order to diffuse light to a desired range. The distance P between the centers of the adjacent LEDs 11 is set to an appropriate numerical value. As described above, in order to diffuse light into a desired range, it is necessary to make the light travel at an angle as designed. By making the refractive index of the bonding layer 22 equivalent to that of the sheet main body 21 and reducing the refraction of light incident on the sheet main body 21 from the bonding layer 22, the light is allowed to travel at the designed angle inside the sheet main body 21. Is possible. The refractive index of the bonding layer 22 is preferably in the range of −5 to + 5% with respect to the refractive index of the sheet body 21, for example.

  A plurality of diffusion parts 23 are arranged on the second surface 21 b of the sheet body 21. The diffusion unit 23 has a function of diffusing the light incident from the first surface 21a and emitting it from the second surface 21b. The diffusion part 23 is formed of a translucent resin piece. As shown in FIG. 4, the plurality of diffusion portions 23 are discretely arranged on the second surface 21 b of the sheet main body 21. Here, discrete means that the diffusion unit 23 is not continuously arranged as a whole. That is, the diffusing portions 23 may be randomly arranged on the second surface 21b of the sheet body 21 as shown in FIG. 4 or arranged in a regular pattern (for example, a lattice shape or a zigzag shape). May be.

  The diffusion unit 23 may be of any material and shape as long as it can diffuse the light incident on the sheet main body 21. For example, the diffusion part 23 may be a resin piece made of a sheet, a film, or the like having light diffusibility. Further, the diffusion portion 23 may be a white resin piece or a white print layer. In the case of the diffusing portion 23 having no light transmittance, light is diffused by reflection. Further, the diffusing portion 23 may be a convex portion (dimple) formed on the second surface 21b of the sheet body 21.

  For example, when the diffusion portion 23 is circular, the average diameter of the diffusion portion 23 is preferably about 20 to 200 μm. The ratio of the area (total) of the diffusion portion 23 to the opening area of one pixel of the display portion 10 is preferably about 10 to 20%.

  Since the optical sheet 20 (sheet main body 21) of the present embodiment has a plurality of diffusing parts 23 arranged discretely, as shown in FIG. 23 is arranged not only on a pixel region 25 (described later) but also between adjacent pixel regions 25. According to this, the light emitted from the LED 11 is diffused not only in the region of the pixel region 25 but also between adjacent pixel regions 25. Therefore, in the display device 1, the black space between the pixels can be made inconspicuous.

  In addition, since the optical sheet 20 has a plurality of diffusion parts 23 arranged discretely, the ratio of scattering of external light by the diffusion part 23 can be reduced. Therefore, a decrease in contrast can be suppressed as compared with a case where the diffusion portions 23 are not discretely arranged (for example, when the diffusion portions 23 are arranged almost on the entire surface).

  The light shielding unit 24 is a member that prevents a part of the light diffused in the pixel region 25 from traveling to the adjacent pixel region 25 and preventing other light from traveling to the adjacent pixel region 25. The light shielding part 24 is formed of, for example, an ultraviolet curable resin containing black fine particles such as carbon black.

  As shown in FIG. 4, the light shielding portion 24 is formed in a lattice shape along the X and Y directions orthogonal to each other when viewed from the observation side (Z2 side). In the sheet main body 21, each square area delimited by the light shielding unit 24 indicates a range of the pixel area 25 corresponding to the LED 11 of the display unit 10.

  As shown in FIG. 4, the light shielding unit 24 is disposed between each pixel region 25 adjacent in the XY direction. For this reason, the length E of one side of one pixel region 25 delimited by the light shielding unit 24 is equal to the distance P between the centers of the adjacent pixel regions 25 in the XY direction. 4 schematically shows the positions (two locations) of the LEDs 11 when the display unit 10 is superimposed on the back side of the optical sheet 20. FIG.

  When the display device 1 is viewed from the Z2 side to the Z1 side, the distance P between the centers of the respective pixel regions 25 adjacent in the XY direction is the distance between the centers of the respective LEDs 11 adjacent in the XY direction. (Hereinafter, the distance between the centers of adjacent LEDs 11 in the XY direction is also referred to as P).

  As shown in FIG. 2, the light shielding portion 24 extends along the thickness direction of the sheet main body 21 (optical sheet 20). In the present embodiment, the light shielding part 24 is formed in a rectangular shape with a long and narrow cross section. The light-shielding portion 24 has an end on the back side (Z1 side) at the same position as the first surface 21a of the sheet body 21, and an end on the observation side (Z2 side) is closer to the first surface 21a than the second surface 21b. Is located. Most of the light incident on the sheet main body 21 from the LED 11 is not mixed between the light incident on the adjacent pixel region 25 and the pixels because the light traveling to the adjacent pixels is blocked by the light shielding unit 24. Accordingly, the display device 1 does not blur the image between pixels.

  On the other hand, if the end of the light-shielding portion 24 on the observation side is at the same position as the second surface 21b of the sheet main body 21, all of the incident light does not travel to adjacent pixels. The black space becomes more noticeable. However, as shown in FIG. 2, the light-shielding portion 24 of the present embodiment has a region where light can travel between the observation-side end portion and the second surface 21 b of the sheet main body 21. Part of the light incident on the pixel area 25 travels from this area to the adjacent pixel area 25. According to this, since the light traveling to the adjacent pixel region 25 is mixed with the light traveling from the adjacent pixel region 25, the black space between the pixels can be made inconspicuous in the display device 1. As described above, since the light shielding unit 24 of the present embodiment does not completely separate the pixels, the display device 1 does not blur the image between the pixels and can make the black space between the pixels less noticeable. .

  Further, as shown in FIG. 2, a reflective layer 24 a is formed on the side surface of the light shielding portion 24. By forming the reflective layer 24a on the side surface of the light-shielding portion 24, part of the light traveling toward the adjacent pixel can be reflected by the reflective layer 24a and returned to the same pixel again. Incident light can be used more effectively. In the light shielding portion 24, a light absorption layer may be formed instead of the reflective layer 24a. By forming the light absorption layer on the side surface of the light shielding part 24, the light shielding property by the light shielding part 24 can be further enhanced.

Here, the relationship between the thickness of the optical sheet 20 and the distance P between the centers of the LEDs 11 adjacent to each other in the XY direction of the display unit 10 will be described.
As shown in FIG. 2, when the thickness of the optical sheet 20 is H and the distance between the centers of the respective LEDs 11 adjacent to the display unit 10 in the XY direction is P,
50 ° <90 ° −arc · tan (H / (P / 2)) <70 ° (1)
The thickness H of the optical sheet 20 and the distance P of the LEDs 11 in the display unit 10 are set so as to satisfy the above.

  For example, when the value of 90 ° -arc · tan (H / (P / 2)) is 50 °, the thickness H of the optical sheet 20 is 1.68 mm, and the distance P between the centers of the LEDs 11 is 4 mm. When the value of 90 ° −arc · tan (H / (P / 2)) is 70 °, the thickness H of the optical sheet 20 is 0.728 mm, and the distance P between the centers of the LEDs 11 is 4 mm.

  In the formula (1), when the value of 90 ° -arc · tan (H / (P / 2)) is less than 50 °, most of the light spreading over 50 ° with respect to the perpendicular extending from the center of the LED 11 Without being moved a sufficient distance in the direction of adjacent pixels, the light is blocked by the light shielding portion 24 disposed between the pixels. According to this, in addition to the amount of light diffused by the diffusion unit 23 being reduced, the light mixing between the adjacent pixels is less likely to occur, so that the black space between the pixels is conspicuous in the display device 1. It becomes easy.

  On the other hand, in Formula (1), when the value of 90 ° -arc · tan (H / (P / 2)) exceeds 70 °, most of the light that spreads over 70 ° with respect to the perpendicular extending from the center of the LED 11 Is less likely to be blocked by the light blocking portion 24 disposed between the pixels, and diffuses over a wide range, so that the amount of light per unit area decreases. In this way, light that spreads over 70 ° is less likely to be used as light traveling toward the observation side (Z2 side), and thus is less visible to the viewer as bright light.

Therefore, in the formula (1), the thickness of the optical sheet 20 and the distance of the LED 11 in the display unit 10 so that the value of 90 ° -arc · tan (H / (P / 2)) satisfies 50 ° or more and 70 ° or less. By setting P, the black space between the pixels in the display device 1 can be made inconspicuous. In addition, since a decrease in the amount of light per unit area is suppressed, it becomes easy for an observer to visually recognize as bright light.
When the bonding layer 22 is sufficiently thin (for example, 50 μm or less), the thickness of the sheet body 21 may be set to H.

According to the optical sheet 20 and the display device 1 of the present embodiment described above, for example, the following effects can be obtained.
In the optical sheet 20 of the present embodiment, the light of the LED 11 incident from the first surface 21 a of the sheet main body 21 is diffused by a plurality of diffusion parts 23 arranged on the sheet main body 21. According to this, since the optical sheet 20 can diffuse the light emitted from the LEDs 11 not only between the pixels but also between the pixels, the display device 1 makes the black space between the pixels less noticeable. be able to. Further, in the optical sheet 20, most of the light incident from the first surface 21 a of the sheet body 21 is blocked from traveling to the adjacent pixels by the light shielding unit 24, and is mixed between the light incident on the adjacent pixels and the pixels. Therefore, in the display device 1, the image is not blurred between pixels. Moreover, since the light-shielding part 24 of the optical sheet 20 does not completely separate the pixels, the display device 1 does not blur the image between the pixels and makes the black space between the pixels less noticeable.
Therefore, according to the optical sheet 20 of the present embodiment and the display device 1 including the same, the image quality of the displayed image can be further improved.

  In the display device 1 of the present embodiment, when the thickness of the optical sheet 20 is H and the distance between the centers of the LEDs 11 adjacent to each other in the XY direction of the display unit 10 is P, 50 ° <90 ° − The thickness of the optical sheet 20 and the distance P of the LEDs 11 in the display unit 10 are set so as to satisfy arc · tan (H / (P / 2)) <70 °. Therefore, according to the display device 1 of the present embodiment, the black space between the pixels can be made inconspicuous. Moreover, according to the display apparatus 1, since the fall of the light quantity per unit area is suppressed, it becomes easy to be visually recognized as bright light by an observer.

  In the optical sheet 20 of the present embodiment, the plurality of diffusion portions 23 are discretely arranged. According to this, since the ratio of scattering of external light is reduced in the diffusing unit 23, it is possible to suppress a decrease in contrast.

  In the optical sheet 20 of the present embodiment, the plurality of diffusing portions 23 are disposed on the second surface 21b of the optical sheet 20 (sheet body 21). Therefore, the optical sheet 20 can diffuse the incident light over a wider range than when the diffusing unit 23 is disposed inside the sheet main body 21.

  In the optical sheet 20 of the present embodiment, a reflective layer 24 a is formed on the side surface of the light shielding portion 24. According to this, a part of the light incident from the first surface 21a of the sheet body 21 can be reflected by the reflective layer 24a and returned to the same pixel again, so that the incident light can be used more effectively. Can do. Moreover, when the light absorption layer is formed on the side surface of the light shielding part 24, the light shielding property by the light shielding part 24 can be further improved.

Next, the array type display device 100 of this embodiment will be described.
FIG. 6 is an external view of the array type display device 100 of the present embodiment. 7 is a cross-sectional view taken along line XX of FIG. 6 and 7, the same components as those in the above-described embodiment will be described with the same reference numerals.

As shown in FIG. 6, the array type display device 100 is a large-screen display panel in which four display devices 1 are combined. The four display devices 1 are installed in a lattice shape so that the opposing side surfaces are in contact with each other through the gap S. Each display device 1 is fixed on the back side of the display unit 10 by a connecting member (not shown). The gap S is provided to allow the side surfaces of the adjacent display devices 1 to face each other at equal intervals.
In each display device 1 used in the array type display device 100, the outermost light shielding portion 24 (see FIG. 2) is omitted on the side facing the other adjacent display device 1.

  As shown in FIG. 7, a light guide unit 200 is formed on the side surface of the display device 1. The light guide unit 200 has a function of emitting light reaching the side surface of the optical sheet 20 from the side surface to the observation side (Z2 side) through the gap S. In the display device 1, the light guide unit 200 is formed on two sides (X direction and Y direction) facing the other adjacent display device 1.

  The light guide unit 200 includes a plurality of unit optical shape units 210. The unit optical shape portions 210 extend along the X direction (or Y direction), and a plurality of unit optical shape portions 210 are formed along the thickness direction (Z direction). The unit optical shape portion 210 has a substantially triangular cross section parallel to the ZY plane so as to protrude toward the side facing the other adjacent display device 1. The unit optical shape portion 210 includes a first inclined surface 211 and a second inclined surface 212 that faces the first inclined surface 211.

The first inclined surface 211 is a surface on which light L emitted from the display unit 10 and reaching the side surface is incident. The first inclined surface 211 is formed so as to face obliquely upward (Z2 direction) so as to face the light L traveling upward with respect to the side surface of the optical sheet 20.
The second inclined surface 212 is a surface from which the light L totally reflected by the first inclined surface 211 is emitted. The second inclined surface 212 is formed so as to be substantially parallel to the X direction (or Y direction).

  As shown in FIG. 7, the unit optical shape section 210 has a height h that decreases stepwise from the first surface 21 a side to the second surface 21 b side in the thickness direction (Z direction) of the optical sheet 20. (H1> h2> h3). By gradually reducing the height h of the unit optical shape portion 210, the light L reflected by the unit optical shape portion 210 close to the first surface 21a side is formed on the second surface 21b side. Interference with (first inclined surface 211) can be suppressed.

If the side surface of the optical sheet 20 is a flat surface, it is difficult for light to be emitted from between the adjacent display devices 1, so that the gap S between the adjacent display devices 1 looks like a streak. End up.
On the other hand, in the array type display device 100 of the present embodiment, the light L reaching the side surface of the optical sheet 20 is totally reflected by the first inclined surface 211 of the unit optical shape portion 210 as shown in FIG. The light is emitted from the second inclined surface 212 to the observation side. As described above, in each display device 1 of the array type display device 100, the light L is emitted from each unit optical shape portion 210 on the side surface of the optical sheet 20, so that the gap S between the adjacent display devices 1 is a streak. It becomes difficult to be visually recognized as.

  The unit optical shape portion 210 may be formed on the entire surface of the optical sheet 20 from the first surface 21a side to the second surface 21b side, or may be formed in a half region on the observation side. Good. In addition, the unit optical shape portion 210 is preferably formed on the side surface of each optical sheet 20 in the adjacent display device 1, but may be formed on the side surface of at least one of the optical sheets 20.

  FIG. 8 is a diagram for explaining another embodiment of the light guide unit 200. In the example shown in FIG. 8A, a curved surface formed at a corner portion on the observation side (Z2 side) of the optical sheet 20 is formed as the light guide portion 200A. As shown in FIG. 8A, the light L that has reached the side surface of the optical sheet 20 is refracted by the curved surface of the light guide unit 200A and is emitted from the gap S to the observation side.

In the example shown in FIG. 8B, a diffusion layer is formed on the side surface of the optical sheet 20 as the light guide unit 200B. As shown in FIG. 8B, the light L that has reached the side surface of the optical sheet 20 is diffused by the light guide unit 200B and emitted from the gap S to the observation side (Z2 side).
Also in the above-described light guides 200A and 200B, more light reaching the side surface of the optical sheet 20 can be emitted toward the observation side, so that the gap S between the adjacent display devices 1 is visually recognized as a streak. It becomes difficult to be done.

  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. In addition, although the above-mentioned embodiment and the deformation | transformation form mentioned later can also be used in combination suitably, detailed description is abbreviate | omitted.

(Deformation)
In the present embodiment, the example in which the LEDs 11 are arranged at equal intervals in the X direction and the Y direction orthogonal to each other on the emission surface 10a of the display unit 10 has been described, but the present invention is not limited thereto. For example, the LEDs 11 may be arranged in a staggered manner, or may be regularly arranged based on a specific pattern.

  In this embodiment, although the example which has arrange | positioned the spreading | diffusion part 23 in the 2nd surface 21b (output surface) of the sheet | seat main body 21 was demonstrated, it is not limited to this. The diffusing unit 23 may be disposed inside the sheet main body 21, or may be disposed both on the second surface 21 b and inside the sheet main body 21.

  In the present embodiment, the example in which the light shielding unit 24 has a rectangular shape with a long and narrow cross section has been described. However, the present invention is not limited to this. The light shielding unit 24 may be a trapezoid or triangle having a vertically long cross section. Further, the side surface of the light shielding unit 24 is not limited to a flat surface, and may be a surface having an uneven shape, for example.

  In the present embodiment, an example has been described in which an LED (light emitting diode) is used as the light emitting element, but the present invention is not limited to this. The light emitting element may be, for example, an organic EL (electroluminescence). Moreover, although this embodiment demonstrated the example using a micro LED array as the display part 10, it is not limited to this. In the bonding layer 22, a normal LED array can be used by forming a space in a portion in contact with the LED.

DESCRIPTION OF SYMBOLS 1 Display apparatus 10 Display part 11 LED
DESCRIPTION OF SYMBOLS 20 Optical sheet 21 Sheet | seat main body 21a 1st surface 21b 2nd surface 22 Joining layer 23 Diffusion part 24 Light-shielding part 24a Reflective layer 100 Array type display apparatus 200,200A, 200B Light guide part 210 Unit optical shape part 211 1st inclined surface 212 Second inclined surface

Claims (9)

An optical sheet disposed on the emission surface side of a display unit provided with a plurality of light emitting elements that emit light,
A sheet body having a first surface on which light emitted from the light emitting element is incident and a second surface from which light is emitted, and a plurality of pixel regions corresponding to each of the plurality of light emitting elements;
A plurality of diffusion portions provided in the sheet main body and diffusing light incident from the first surface;
In the sheet main body, a light shielding portion disposed between the adjacent pixel regions;
A bonding layer that is provided on the second surface side of the sheet body, has light transmittance and a refractive index equivalent to that of the sheet body, and bonds the sheet body and the emission surface of the display unit;
An optical sheet comprising: The optical sheet according to claim 1,
When the thickness of the optical sheet is H and the distance between the centers of the adjacent pixel regions is P,
50 ° <90 ° -arc · tan (H / (P / 2)) <70 °
Meeting,
An optical sheet characterized by The optical sheet according to claim 1 or 2,
The plurality of diffusion portions are discretely arranged on the sheet body,
An optical sheet characterized by The optical sheet according to claim 3,
A plurality of the diffusion portions are disposed on the second surface side of the sheet body;
An optical sheet characterized by The optical sheet according to any one of claims 1 to 4, wherein
The light-shielding portion extends along the thickness direction of the sheet body, and includes a light reflection layer or a light absorption layer on a side surface;
An optical sheet characterized by The optical sheet according to any one of claims 1 to 5,
A display unit provided with a plurality of light emitting elements that emit light;
A display device comprising: A plurality of display devices according to claim 6, wherein the display devices are arranged so that the side surfaces of the display devices face each other through a gap,
The display device includes a light guide unit that emits light reaching the side surface of the optical sheet from the side surface to the observation side through the gap.
An array type display device. The array type display device according to claim 7,
The light guide section includes a plurality of unit optical shape sections configured by a first inclined surface and a second inclined surface facing the first inclined surface;
An array type display device. The array type display device according to claim 8,
The unit optical shape part has a stepwise decrease in height as it goes from the first surface side to the second surface side of the optical sheet.
An array type display device.

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