JPWO2018225643A1 - VIEWING ANGLE CONTROLLER, MANUFACTURING METHOD THEREOF, AND VIEWING ANGLE CONTROLLED IMAGE DISPLAY - Google Patents

Abstract

The viewing angle control body (1) of the present invention comprises a louver layer (10) in which a plurality of light transmission bands (11) and a plurality of light shielding bands (12) are alternately provided, and the plurality of light transmission bands are provided. A first end region (1a) including one end of the viewing angle control body (1) in the direction A in which (11) and the plurality of light-shielding bands (12) are alternately provided; A second end region (1b) including the other end of the viewing angle control body (1), and a central region (1c) between the first end region (1a) and the second end region (1b). And a mean value of the widths of the plurality of light transmission bands (11) provided in the first end region (1a) and the second end region (1b) is provided in the central region (1c). It is wider than the average value of the widths of the plurality of light transmission bands (11).

Description

The present invention relates to a view angle control body for controlling a view angle of an image displayed by an image display device, a manufacturing method thereof, and a view angle control image display body including the view angle control body.
The present application claims priority based on Japanese Patent Application No. 2017-110879 filed in Japan on June 5, 2017, the contents of which are incorporated herein by reference.

2. Description of the Related Art As a device for displaying and inputting information, an information input / output device equipped with an image display device with a touch panel is widely used. In this information input / output device, since the confidential information may be included in the image displayed on the image display device, the display surface of the image display device can be displayed on the left and right sides without impairing the visibility from the front side. A sheet-shaped viewing angle control body is provided to prevent peeping from the opposite side.
The viewing angle control body for preventing peeping includes a louver layer in which light transmission bands and light blocking bands are alternately provided, a transparent protective layer provided on one surface of the louver layer, and the other of the louver layers. A laminated body in which a transparent adhesive layer provided on the surface is laminated is known (Patent Document 1). In addition, in the louver layer for controlling the viewing angle, it is known that the width of the light transmission band is gradually changed to limit the viewing angle of the entire viewing angle control body (Patent Documents 2 and 3).

JP, 2007-212507, A JP 62-249102A JP, 2008-107404, A

  However, when the viewing angle control body as described in Patent Documents 1 to 3 is provided on the display surface of the image display device, the visibility of the image displayed in the end area of the display surface may decrease. . In particular, in recent years, the display surface of the image display device tends to be large, and in the case of a large display surface, the visibility of the image displayed in the end area is significantly reduced.

INDUSTRIAL APPLICABILITY The present invention has an anti-peep property in which an image displayed by an image display such as an image display device is hard to be visually recognized even if the image is displayed in an end region of the display surface of the image display. It is an object of the present invention to provide a view angle control body capable of ensuring the visibility of an image and a manufacturing method thereof.
It is another object of the present invention to provide a viewing angle control image display body which has a peep prevention property and ensures the visibility of the image displayed in the end region of the image display body display surface. .

The present invention includes the following aspects.
[1] A sheet-shaped viewing angle control body including a louver layer in which a plurality of light transmission bands and light blocking bands are alternately provided,
A first end region including one end of the view angle control body in a direction A along the surface direction of the view angle control body, and a second end including the other end of the view angle control body in the direction A. A partial region and a central region formed between the first end region and the second end region,
The width of the light transmission band provided in the first end region and the second end region along the direction A is larger than the width of the light transmission band provided in the central region along the direction A. Wide view angle control body.
[2] The view angle control body according to [1], wherein the view angle control body is a rectangle and the direction A is a longitudinal direction of the view angle control body.
[3] The width of the light transmission band provided in the central region is 50 μm or more and 200 μm or less, and the width of the light transmission band provided in the first end region and the second end region is the central region. The viewing angle control body according to [1] or [2], which is wider than the width of the provided light transmission band in a range of 1 μm or more and 30 μm or less.
[4] A first intermediate region is provided between the first end region and the central region, and a second intermediate region is provided between the second end region and the central region. The width of the light transmission band provided in the intermediate region is narrower than the width of the light transmission band provided in the first end region and wider than the width of the light transmission band provided in the central region, 2 The width of the light transmission band provided in the intermediate region is narrower than the width of the light transmission band provided in the second end region and wider than the width of the light transmission band provided in the central region, 1] or the viewing angle control body according to [2].
[5] The width of the light transmission band provided in the central region is 50 μm or more and 200 μm or less, and the width of the light transmission band provided in the first intermediate region is the width of the light transmission band provided in the central region. The width of the light transmission band provided in the first end region is 1 μm or more and 30 μm or less than the width of the light transmission band provided in the first intermediate region. And the width of the light transmission band provided in the second intermediate region is wider than the width of the light transmission band provided in the central region by 1 μm or more and 30 μm or less, The viewing angle control body according to [4], wherein the width of the light transmission band provided is wider than the width of the light transmission band provided in the second intermediate region in the range of 1 μm or more and 30 μm or less.
[6] The viewing angle according to any one of [1] to [5], in which the width of the light transmission band of each area is adjusted so that the difference between the viewing angles of the areas adjacent to each other is 15 ° or less. Control body.
[7] The viewing angle control body according to any one of [1] to [6], in which the width of the light transmission band in each region is the same.

[8] A laminated body forming step of forming a laminated body by alternately laminating a plurality of light transmission band sheets and a light shielding band sheet, and a block body forming step of pressing the laminated body to form a block body, A cutting step of cutting the block body perpendicular to the surface of each sheet,
In the laminated body forming step, a first laminated unit forming step of forming a first laminated unit by alternately laminating a plurality of first light transmitting band sheets and light shielding band sheets, and A second laminated unit forming step of forming a second laminated unit by alternately laminating a plurality of thin second light transmission band sheets and light shielding band sheets, and a third light transmission band thicker than the second light transmission band sheet. A third laminated unit forming step of forming a third laminated unit by alternately laminating a plurality of sheets and sheets for shading bands, and a second laminated unit between the first laminated unit and the third laminated unit. And a method for manufacturing a viewing angle control body.
[9] The thickness of the second light transmitting band sheet is 50 μm or more and 200 μm or less, and the thickness of the first light transmitting band sheet and the thickness of the third light transmitting band sheet are the second light transmitting band. The method for manufacturing a viewing angle control body according to [8], wherein the thickness is increased in the range of 1 μm or more and 30 μm or less than the thickness of the band sheet.
[10] In the laminated body forming step, a plurality of fourth light transmission band sheets and light shielding band sheets which are thinner than the first light transmission band sheet and thicker than the second light transmission band sheet are alternately laminated to form a first layer. A fourth laminated unit forming step of forming four laminated units, and laminating a fifth light transmitting band sheet and a light shielding band sheet thinner than the third light transmitting band sheet and thicker than the second light transmitting band sheet. A fifth laminated unit forming step of forming a fifth laminated unit, arranging a fourth laminated unit between the first laminated unit and the second laminated unit, and forming a second laminated unit and a third laminated unit. The method for manufacturing a view angle control body according to [8], wherein the fifth laminated unit is arranged between the first laminated unit and the fifth laminated unit, and the second laminated unit is arranged between the fourth laminated unit and the fifth laminated unit.
[11] The thickness of the second light transmission band sheet is 50 μm or more and 200 μm or less, and the thickness of the fourth light transmission band sheet is 1 μm or more and 30 μm or less than the thickness of the second light transmission band sheet. The thickness of the sheet for the first light transmission band is made thicker than the thickness of the sheet for the fourth light transmission band in the range of 1 μm or more and 30 μm or less, and the thickness of the sheet for the fifth light transmission band. Is thicker than the thickness of the second light transmission band sheet in the range of 1 μm or more and 30 μm or less, and the thickness of the second light transmission band sheet is 1 μm or more and 30 μm or more than the thickness of the fifth light transmission band sheet. The method for manufacturing a view angle control body according to [10], which is thickened in the following range.

[12] A view angle control image display body comprising an image display body and the view angle control body according to any one of [1] to [7] provided on the image display side of the image display body.
[13] The viewing angle control image display according to [12], wherein confidential information is displayed on the image display, and the central area of the viewing angle control is superimposed on the display of the confidential information.

The present invention also includes the following aspects.
[1] A view angle control body including a louver layer in which a plurality of light transmission bands and a plurality of light blocking bands are alternately provided,
A first end region including one end of the viewing angle control body in the direction A in which the plurality of light transmission bands and the plurality of light blocking bands are alternately provided; and the viewing angle control body in the direction A. A second end region including the other end, and a central region between the first end region and the second end region,
An average value of widths of the plurality of light transmission bands provided in the first end region and the second end region is greater than an average value of widths of the plurality of light transmission bands provided in the central region. Wide view angle control body.
[2] The view angle control body according to [1], wherein the view angle control body is a rectangle in a plan view, and the direction A is a longitudinal direction of the view angle control body.
[3] An average value of widths of the plurality of light transmission bands provided in the central region is 50 μm or more and 200 μm or less, and the plurality of lights provided in the first end region and the second end region. The viewing angle control according to [1] or [2], wherein the average value of the widths of the transmission bands is wider than the average value of the widths of the plurality of light transmission bands provided in the central region in the range of 1 μm or more and 30 μm or less. body.
[4] A first intermediate region is provided between the first end region and the central region, and a second intermediate region is provided between the second end region and the central region. The average value of the widths of the plurality of light transmission bands provided in is narrower than the average value of the widths of the plurality of light transmission bands provided in the first end region, and the average value of the widths provided in the central region. The average value of the widths of the plurality of light transmission bands provided in the second intermediate region is wider than the average value of the widths of the plurality of light transmission bands of the plurality of light beams provided in the second end region. The viewing angle control body according to [1] or [2], which is narrower than an average value of widths of transmission bands and wider than an average value of widths of the plurality of light transmission bands provided in the central region.
[5] The average value of the widths of the plurality of light transmission bands provided in the central region is 50 μm or more and 200 μm or less, and the average value of the widths of the plurality of light transmission bands provided in the first intermediate region is The average value of the widths of the plurality of light transmission bands provided in the first end region is wider than the average value of the widths of the plurality of light transmission bands in the range of 1 μm or more and 30 μm or less. Is wider in the range of 1 μm or more and 30 μm or less than the average value of the widths of the plurality of light transmission bands provided in the first intermediate region, and the width of the plurality of light transmission bands provided in the second intermediate region is The average value is wider than the average value of the widths of the plurality of light transmission bands provided in the central region in the range of 1 μm or more and 30 μm or less, and the width of the plurality of light transmission bands provided in the second end region. The average value of the plurality of optical transmissions provided in the second intermediate region. Wide by 30μm or less the range of 1μm than the average value of the width of the band, the viewing angle control element according to [4].
[6] The difference between the viewing angle of the first end region and the viewing angle of the central region is 15 ° or less,
The view angle control body according to claim 1, wherein a difference between a view angle of the central region and a view angle of the second end region is 15 ° or less.
[7] The widths of the plurality of light transmission bands in the first end region are the same,
The widths of the plurality of light transmission bands in the second end region are the same,
The viewing angle control body according to any one of [1] to [6], wherein the widths of the plurality of light transmission bands in the central region are the same.
[8] The width of the central region is preferably 20% or more and 80% or less, and more preferably 30% or more and 60% or less, with respect to the entire length of the viewing angle control body in the longitudinal direction. ] The viewing angle control body as described in any one of [7].
[9] The width of the first end region and the width of the second end region are preferably 10% or more and 40% or less, and 20% or more, with respect to the entire length of the viewing angle control body in the longitudinal direction. The viewing angle control body according to any one of [1] to [8], which is more preferably 35% or less.
[10] The average value of the widths of the plurality of light-shielding bands is preferably 1 μm or more and 50 μm or less, more preferably 10 μm or more and 30 μm or less, and described in any one of [1] to [9]. View angle control body.
[11] Forming a laminated body by alternately laminating a plurality of light-transmitting band sheets and a plurality of light-shielding band sheets, pressurizing the laminated body to form a block body, and the block body. A plurality of light-transmitting band sheets and a plurality of light-shielding band sheets for cutting along the direction of alternately laminated,
Forming the laminated body includes forming a first laminated unit by alternately laminating a plurality of first light transmission band sheets and a plurality of first light shielding band sheets, and forming the first light transmission band. Forming a second laminated unit by alternately laminating a plurality of second light transmission band sheets and a plurality of second light shielding band sheets that are thinner than the second light transmission band sheet; Alternately stacking the third light-transmitting band sheet and the plurality of third light-blocking band sheets to form a third stacked unit, and between the first stacked unit and the third stacked unit, A method of manufacturing a viewing angle control body, comprising disposing a second laminated unit.
[12] The average value of the thickness of the plurality of sheets for the second light transmission band is 50 μm or more and 200 μm or less, and the average value of the thickness of the plurality of sheets for the first light transmission band and the plurality of third light beams. Manufacturing of the viewing angle control body according to [11], wherein the average value of the thickness of the transmission band sheet is thicker than the average value of the thicknesses of the plurality of second light transmission band sheets in the range of 1 μm or more and 30 μm or less. Method.
[13] Forming the laminated body further includes forming a plurality of fourth light transmission band sheets and a plurality of fourth light shielding bands that are thinner than the first light transmission band sheet and thicker than the second light transmission band sheet. Alternately stacking the band sheets to form a fourth laminated unit, and a plurality of fifth light transmissive band sheets thinner than the third light transmissive band sheet and thicker than the second light transmissive band sheet. Alternately stacking a plurality of fifth light shielding strip sheets to form a fifth stacked unit, arranging the fourth stacked unit between the first stacked unit and the second stacked unit, Arranging the fifth laminated unit between the second laminated unit and the third laminated unit, and arranging the second laminated unit between the fourth laminated unit and the fifth laminated unit. Including, described in [11] Of manufacturing the viewing angle control body of.
[14] The average value of the thickness of the plurality of sheets for the second light transmission band is 50 μm or more and 200 μm or less, and the average value of the thickness of the plurality of sheets for the fourth light transmission band is the plurality of second light beams. It is thicker in the range of 1 μm or more and 30 μm or less than the average value of the thickness of the transmission band sheets, and the average value of the thickness of the plurality of first light transmission band sheets is the thickness of the plurality of fourth light transmission band sheets. Is thicker than the average value of the thickness in the range of 1 μm or more and 30 μm or less, and the average value of the thickness of the plurality of fifth light transmission band sheets is larger than the average value of the thickness of the plurality of second light transmission band sheets. A range of 1 μm or more and 30 μm or less, and an average value of thicknesses of the plurality of second light transmission band sheets is 1 μm or more and 30 μm or less than an average value of thicknesses of the plurality of fifth light transmission band sheets. The method for producing a viewing angle control body according to [13], which is thick and thick.
[15] A viewing angle control image display body comprising an image display body, and the viewing angle control body according to any one of [1] to [10] provided on the image display side of the image display body.
[16] The viewing angle control image display body according to [15], wherein confidential information is displayed on the image display body, and a central region of the viewing angle control body is overlaid on a region where the confidential information is displayed.

In the viewing angle control body of this aspect, it is preferable that the installation angles of the light shielding bands are the same throughout the viewing angle control body. Here, the installation angle is an angle of the light-shielding band with respect to the vertical direction of the surface of the viewing angle control body, and is an angle in the range of 0 ° or more and less than 90 °.
In the viewing angle control body according to this aspect, it is preferable that the louver layer has a constant thickness.
In the viewing angle control body of the present aspect, it is preferable that the width of the light-shielding band is the same throughout the viewing angle control body 1.
In the method of manufacturing a viewing angle control body according to this aspect, it is preferable that the block body is cut so that the louver layer has a constant thickness.

INDUSTRIAL APPLICABILITY The viewing angle control body of the present invention is displayed in the end area of the display surface of the image display body while having the peep prevention property that the image is difficult to be visually recognized even if the image displayed by the image display body is peeked. The visibility of the displayed image can be secured.
According to the manufacturing method of the viewing angle control body of the present invention, the viewing angle control body having the above effects can be easily manufactured.
The viewing angle controlled image display of the present invention has a peep prevention property, and the visibility of the image displayed in the end region of the display surface of the image display is secured.

It is a schematic sectional drawing which shows the viewing angle control body of 1st Embodiment of this invention. FIG. 6 is a schematic view illustrating the method of manufacturing the viewing angle control body according to the first embodiment. It is a schematic sectional drawing which shows the viewing angle control body of 2nd Embodiment of this invention. It is a schematic diagram explaining the manufacturing method of the viewing angle control body of 2nd Embodiment. It is a schematic sectional drawing which shows the viewing angle control body of 3rd Embodiment of this invention.

<First Embodiment>
The viewing angle control body according to the first embodiment of the present invention will be described.
FIG. 1 shows the viewing angle control body of the present embodiment. The viewing angle control body 1 of the present embodiment has a rectangular sheet shape, and a louver layer 10 in which a plurality of light transmission bands 11 and a plurality of light blocking bands 12 are alternately provided, and one surface of the louver layer 10. And a second transparent protective layer 30 provided on the entire other surface of the louver layer 10. The viewing angle control body 1 is provided on the image display surface of the image display body and is suitably used as a peep prevention body.
In the viewing angle control body 1, the second transparent protective layer 30 is arranged on the light incident side, that is, the image display body side, and the first transparent protective layer 20 is arranged on the light emitting side.
In the present embodiment, the longitudinal direction of the rectangular view angle control body 1 is the X direction (the horizontal direction of the paper surface in FIG. 1), and the short direction of the view angle control body 1 (the vertical direction of the paper surface in FIG. 1) is the Y direction. Direction, that is, the direction perpendicular to the surface of the view angle control body 1 (that is, the thickness direction of the view angle control body 1) is the Z direction.
Note that the rectangle in the present embodiment has only to have a schematic outer shape that is a rectangle when the viewing angle control body 1 is viewed from the Z direction (in plan view). For example, at least one of the rectangular corners may be corner cut. Further, a notch may be formed in any part of the peripheral edge of the rectangle, or a protrusion partly protruding from the side of the rectangle may be formed. Further, the sides of the rectangle may be partially non-linear (for example, curved, zigzag, etc.).

The light transmittance of the entire viewing angle control body 1 is preferably 45% or more, more preferably 55% or more. The upper limit of the light transmittance is preferably high, but about 80% is the limit in order to secure sufficient peep prevention. Specifically, it is preferably 45% or more and 80% or less, and more preferably 55% or more and 80% or less.
In the present specification, the value of the light transmittance is D65 defined in JIS Z 8720 as a light source, and in a device that measures the intensity of the inspection light emitted from the light source with a light receiving sensor, the optical transmittance of the inspection light is measured. The output value of the light receiving sensor when there is no measurement object is A, and the output value when the measurement object is set on the optical path of the inspection light and the transmitted light transmitted through the measurement object is received by the light reception sensor is B In this case, the light transmittance = (B / A) × 100 (unit:%).

The viewing angle control body 1 of the present embodiment includes the first end region 1a including one end portion in the longitudinal direction of the viewing angle control body 1 and the other end portion in the longitudinal direction of the viewing angle control body 1. It has a second end region 1b and a central region 1c formed between the first end region 1a and the second end region 1b.
As will be described later, the average values of the widths of the plurality of light transmission bands 11 are different between the first end region 1a and the second end region 1b and the central region 1c. As shown in this embodiment, each of the first end region 1a, the second end region 1b, and the central region 1c is preferably a quadrangle in a plan view.
The width W _c of the central region 1c varies depending on the object of use of the view angle control body 1, but in many objects of use, 20% or more and 80% or more of the total length of the view angle control body 1 in the longitudinal direction. % Or less, and more preferably 30% or more and 60% or less. When the width W _c of the central area 1c is within the above range, the viewing angle control body 1 of the present embodiment is suitable as a peep prevention body, and the image displayed in the edge area of the image display body display surface. The visibility of can be further improved.
The width W _{a of} the first end region 1 _a and the width W _b of the second end region 1 _b are preferably 10% or more and 40% or less with respect to the entire length of the viewing angle control body 1 in the longitudinal direction, 20 % Or more and 35% or less is more preferable.
The width W _{a of} the first end region 1 _a and the width W _b of the second end region 1 _b may be the same or different, but they are usually the same. When the widths W _a and W _{b of} the first end region 1a and the second end region 1b are the same, the first end region 1a or the second end region 1b with respect to the entire length of the viewing angle control body 1 in the longitudinal direction. The width ratio (%) is _calculated by the formula (100−ratio (%) of the width W _c of the central region 1c) / 2.
The widths W _a , W _b , and W _{c of} the respective regions referred to here are the lengths of the respective regions in the longitudinal direction of the viewing angle control body 1.

  The length of the viewing angle control body 1 in the longitudinal direction is not limited and is, for example, 120 mm or more and 1500 mm or less. The effect of the viewing angle control body of the present invention is particularly useful for an image display body having a large display surface. Therefore, the viewing angle control body 1 having a length in the longitudinal direction of, for example, 250 mm or more is useful, and 300 mm or more is particularly useful. In practice, the length of the viewing angle control body 1 in the longitudinal direction is preferably 600 mm or less, and more preferably 500 mm or less. Specifically, the length of the viewing angle control body 1 in the longitudinal direction is preferably 250 mm or more and 600 mm or less, and more preferably 300 mm or more and 500 mm or less. The length of the viewing angle control body 1 in the lateral direction is preferably 50 mm or more, more preferably 150 mm or more, and further preferably 175 mm or more. On the other hand, practically, the length of the viewing angle control body 1 in the lateral direction is preferably 1000 mm or less, more preferably 500 mm or less, and further preferably 300 mm or less. Specifically, the length of the viewing angle control body 1 in the lateral direction is preferably 50 mm or more and 1000 mm or less, more preferably 150 mm or more and 500 mm or less, and further preferably 175 mm or more and 300 mm or less.

(Louver layer)
The louver layer 10 includes a plurality of linear light transmission bands 11 and a plurality of linear light shielding bands 12, and the light transmission bands 11 and the light shielding bands 12 are alternately and repeatedly arranged. In this embodiment, the light transmission band 11 and the light blocking band 12 are formed along the Y direction. Note that FIG. 1 is a schematic view of the viewing angle control body of the present embodiment, and a small number of light transmission bands 11 and light blocking bands 12 are shown.
In the present invention, the average value of the widths of the plurality of light transmission bands 11 provided in the first end region 1a is made wider than the average value of the widths of the plurality of light transmission bands provided in the central region 1c. At the same time, the average value of the widths of the plurality of light transmission bands 11 provided in the second end region 1b is made wider than the average value of the widths of the plurality of light transmission bands 11 provided in the central region 1c.
In the present embodiment, each width of the plurality of light transmission bands 11 provided in the first end region 1a is made wider than each width of the plurality of light transmission bands provided in the central region 1c. At the same time, the widths of the plurality of light transmission bands 11 provided in the second end region 1b are made wider than the widths of the plurality of light transmission bands 11 provided in the central region 1c.
It is preferable that the widths of the plurality of light transmission bands 11 provided in the first end region 1a are the same. It is preferable that the widths of the plurality of light transmission bands 11 provided in the second end region 1b are the same. It is preferable that the widths of the plurality of light transmission bands 11 provided in the central region 1c are the same.
In the present embodiment, the width of each of the plurality of light transmission bands 11 is the same in each region. If the width of the light transmission band 11 is the same in each region, the viewing angle control body 1 can be easily manufactured.
In the present embodiment, all the light-shielding bands 12 provided in the first end region 1a, the second end region 1b and the central region 1c have the same width.
In the present embodiment, the width of each light transmission band 11 and the length of each light blocking band 12 are the same.
The “width” is the length in the X direction of the light transmission zone 11 or the light shielding zone 12 on the surface of the louver layer 10 on the light emission side. The X direction is a direction in which a plurality of light transmission bands 11 and a plurality of light blocking bands 12 are alternately provided.
The “width of each light transmission band 11 and length of each light shielding band 12” means the length in the Y direction of the light transmission band 11 or the light shielding band 12 on the surface of the louver layer 10 on the light emission side.
The above-mentioned "same" of the width of the light transmitting band 11 and the width of the light shielding band 12 allows a slight difference, and includes a range within the design value ± 5% of the width.

In the viewing angle control body 1, the viewing angle is controlled by providing the light shielding band 12 in each of the first end region 1a, the second end region 1b, and the central region 1c.
Since the width of the light transmission band 11 of the central region 1c is narrower than that of the first end region 1a and the second end region 1b, the viewing angle is narrower than that of the first end region 1a and the second end region 1b. ing. Therefore, the central region 1c is a region having a higher peep prevention property.
The first end region 1a and the second end region 1b have a wider viewing angle because the width of the light transmission band 11 is wider than that of the central region 1c, but the viewing angle is controlled. Has been secured.

The average value of the widths of the plurality of light transmission bands 11 provided in the central region 1c is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less. When the average value of the widths of the plurality of light transmission bands 11 provided in the central region 1c is equal to or more than the lower limit value, sufficient light transmittance can be secured, and when the average value is less than the upper limit value, the peep prevention property is further improved. Get higher
The average value of the widths of the plurality of light transmission bands 11 provided in the first end region 1a and the second end region 1b is greater than the average value of the widths of the plurality of light transmission bands 11 provided in the central region 1c. It is preferably widened in the range of 1 μm or more and 30 μm or less, and more preferably widened in the range of 5 μm or more and 15 μm or less.
Difference between the average value of the widths of the plurality of light transmission bands 11 provided in the first end region 1a and the second end region 1b and the average value of the widths of the plurality of light transmission bands 11 provided in the central region 1c Is greater than or equal to the lower limit, the visibility of the image in the first end region 1a and the second end region 1b is higher, and is less than or equal to the upper limit, the light transmittance of adjacent regions is reduced. The difference becomes smaller, and the difference in visual shade becomes smaller.
The average value of the widths of the plurality of light transmission bands 11 provided in the first end region 1a and the average value of the widths of the plurality of light transmission bands 11 provided in the second end region 1b are the same. It may be different or different.

The width of each of the plurality of light transmission bands 11 provided in the central region 1c is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less. When the width of each of the plurality of light transmission bands 11 provided in the central region 1c is equal to or more than the lower limit value, sufficient light transmittance can be secured, and when the width is less than the upper limit value, the peep prevention property is higher. Become.
The width of each of the plurality of light transmission bands 11 provided in the first end region 1a and the second end region 1b is 1 μm or more than the width of each of the plurality of light transmission bands 11 provided in the central region 1c. It is preferably wide in the range of 30 μm or less, more preferably in the range of 5 μm or more and 15 μm or less.
The difference between the respective widths of the plurality of light transmission bands 11 provided in the first end region 1a and the second end region 1b and the respective widths of the plurality of light transmission bands 11 provided in the central region 1c is the above. If it is at least the lower limit, the visibility of the image in the first end region 1a and the second end region 1b will be higher, and if it is at most the upper limit, the difference in light transmittance between the adjacent regions will be. It becomes smaller, and the difference in light and shade becomes smaller.

The difference between the average value of the widths of the plurality of light transmission bands 11 in the first end region 1a and the average value of the widths of the plurality of light transmission bands 11 in the central region 1c, and the plurality of lights in the second end region 1b. The difference between the average value of the widths of the transmission bands 11 and the average value of the widths of the plurality of light transmission bands 11 in the central region 1c is such that the viewing angle difference is preferably 15 ° or less, more preferably 0.5 ° or more 10 The angle is adjusted to be less than or equal to 0 °, and more preferably between 1 ° and 5 °. As the viewing angle increases, the light transmittance increases. Therefore, when the viewing angle difference is large, the difference in the light transmittance between the regions adjacent to each other is large, and the difference in light and shade is visually large. The appearance of the viewing angle control body 1 is impaired. When the difference in the viewing angle is equal to or less than the upper limit value, the difference in the light transmittance between the areas adjacent to each other becomes small, and the difference in the light and shade between the areas becomes small.
As for the viewing angle, first, the maximum angle θ ₁ of transmitted light in the light transmission band 11 (the maximum angle with respect to the normal to the surface of the louver layer 10) is calculated as arctan (average value of widths of a plurality of light transmission bands 11 / light transmission band 11). Thickness). The thickness of the light transmission band 11 is the length in the Z direction. Viewing angle, the refractive index _{n 1} of the light transmission band 11, the refractive index _{n 2} of the first transparent protective layer 20, the refractive index _{n 3} of the air impact. The refraction of light between the light transmission band 11 and the first transparent protective layer 20 is represented by sin θ ₁ / sin θ ₂ = n ₂ / n ₁ (θ ₂ is the emission angle of light to the first transparent protective layer 20). . Further, the refraction of light between the first transparent protective layer 20 and the air is expressed by sin θ ₂ / sin θ ₃ = n ₃ / n ₂ (θ ₃ is the amount of light entering the air with respect to the normal to the surface of the louver layer 10). Exit angle).
From these facts, sin θ ₃ = ((n ₁ × sin θ ₁ ) / n ₃ ), substituting the values of θ ₁ , n ₁ , and n ₃ into this equation, and using the inverse trigonometric function to calculate θ ₃ Ask. The viewing angle is calculated by 2 × θ ₃ .

The average value of the widths of the plurality of light shielding bands 12 is preferably in the range of 1 μm or more and 50 μm or less, and more preferably in the range of 10 μm or more and 30 μm or less.
The width of each of the plurality of light-shielding bands 12 is preferably in the range of 1 μm or more and 50 μm or less, and more preferably in the range of 10 μm or more and 30 μm or less.
The louver layer 10 in the present embodiment has a constant thickness. The “thickness” here is the length of the louver layer 10 in the Z direction. The thickness of the louver layer 10 can be obtained by measuring a cross-sectional photograph of the viewing angle control body 1 or the louver layer 10 alone, and is an average value obtained by measuring 10 or more positions. In addition, “constant” in thickness includes a range within ± 5% of the design value of thickness.
The thickness of the louver layer 10 is preferably 100 μm or more and 5000 μm or less, more preferably 120 μm or more and 1000 μm or less, and further preferably 150 μm or more and 500 μm or less.
If the thickness of the louver layer 10 is within the above range, the viewing angle can be easily adjusted and the louver layer 10 can be easily manufactured.
In the present specification, “length”, “thickness”, and “width” are values obtained by measuring the length, thickness, or width at any 10 points with a measuring microscope, and averaging the measured values. Is.
The average value of the widths of the plurality of light transmission bands 11 is a value obtained by measuring the widths of the plurality of light transmission bands 11 by the above width measuring method and averaging the obtained values.
The average value of the widths of the plurality of light-shielding bands 12 is a value obtained by measuring the widths of the plurality of light-shielding bands 12 by the above-described width measuring method and averaging the obtained values.

In this embodiment, the installation angles of the light-shielding bands 12 provided in the first end region 1a, the second end region 1b, and the central region 1c are all the same. The installation angle here is the angle of the light-shielding band 12 with respect to the vertical direction of the surface of the viewing angle control body 1, and is an angle in the range of 0 ° or more and less than 90 °.
Further, the “same” of the installation angle includes a range of the design value of the installation angle of ± 2 °.
The specific installation angle of the light-shielding band 12 is preferably 0 ° or more and 3 ° or less, and more preferably 0 ° or more and 1 ° or less. If the installation angle of the light-shielding band 12 provided in the first end region 1a, the second end region 1b, and the central region 1c is equal to or less than the upper limit value, the peep prevention property becomes higher.
The installation angle of the light-shielding band 12 is the center line of the light-shielding band 12 and the vertical direction of the surface in the cross-sectional photograph of the viewing angle control body 1 or the louver layer 10 with reference to the surface of the louver layer 10 on the light emission side. It can be measured as the angle formed by.

[Light transmission band]
As a material forming the light transmission band 11, a resin material that transmits a desired wavelength of visible light is used. The wavelength of light transmitted through the light transmission band 11 may be in the entire visible light range of 380 nm or more and 830 nm or less, or may be a part thereof.
A highly transparent thermoplastic resin or thermosetting resin is used as the resin material forming the light transmission zone 11, and examples thereof include a cellulose resin, a polyolefin resin, a polyester resin, a silicone resin, a polystyrene resin, and a polychlorinated resin. Examples thereof include vinyl resin, acrylic resin, polycarbonate resin and the like. Among these, silicone resin is preferable, and silicone rubber is more preferable in terms of high flexibility, heat resistance and transparency.
As the silicone rubber, for example, a silicone rubber composition generally called a millable rubber, which comprises a diorganopolysiloxane having a molecular chain end blocked with a hydroxysilyl group or a vinylsilyl group and an organic peroxide; In addition to a diorganopolysiloxane having at least two vinyl groups, an organohydrogenpolysiloxane having at least three hydrogen atoms bonded to silicon atoms (that is, SiH bonds) in the molecule and a platinum-based catalyst, so-called addition Examples thereof include reactive type organosilicone rubber compositions.
The light transmission band 11 preferably has a light transmittance of 75% or more, and more preferably 85% or more, when light is incident only on the light transmission band 11 along the Z direction. Specifically, it is preferably 75% or more and 100% or less, and more preferably 85% or more and 100% or less.

[Shading band]
As the material forming the light-shielding band 12, a colored resin obtained by using a resin material forming the light-transmitting band 11 as a base material and adding a coloring agent such as a pigment or a dye to the base material is used.
As the resin material contained in the light shielding band 12, the same resin material as contained in the light transmission band 11 can be used. The resin material included in the light shielding band 12 may be the same as or different from the resin material included in the light transmission band 11. The resin material contained in the light-shielding band 12 is preferably the same as the resin material contained in the light-transmitting band 11 from the viewpoint that the adhesiveness between the light-transmitting band 11 and the light-shielding band 12 becomes high.

The color tone of the light-shielding band 12 may be any color as long as a preferable light-shielding property is obtained in the light-shielding band 12, and may be, for example, black, red, yellow, green, blue, or light blue. The color tone of the light-shielding band 12 can be adjusted by the type and addition amount of the colorant.
Since the color tone of the light-shielding band 12 constitutes the color tone recognized when the louver layer 10 is viewed, it is preferable to design it in consideration of the designability of the viewing angle control body 1.
The light-shielding band 12 preferably has a light transmittance of 40% or less, and more preferably 10% or less when light is incident only on the light-shielding band 12 along the X direction. Specifically, 0% or more and 40% or less is preferable, and 0% or more and 10% or less is more preferable. With such a light transmittance, it has a sufficient light shielding property.

Specific examples of the colorant contained in the light-shielding zone 12 include general organic pigments or inorganic pigments such as carbon black, iron oxide, titanium oxide, yellow iron oxide, disazo yellow, and phthalocyanine blue. The colorants may be used alone or in combination of two or more.
When a black pigment is not used as the colorant, it is preferable to use a white pigment together in order to secure the light shielding property.

(First transparent protective layer, second transparent protective layer)
The first transparent protective layer 20 and the second transparent protective layer 30 are layers made of a transparent resin material, are provided on the surface of the louver layer 10 on the light emission side, and function as protective layers for the louver layer 10.
The light transmittance of the first transparent protective layer 20 and the second transparent protective layer 30 when light is incident along the Z direction is preferably 75% or more, and more preferably 85% or more. Specifically, it is preferably 75% or more and 100% or less, and more preferably 85% or more and 100% or less.
Examples of the transparent resin material forming the first transparent protective layer 20 and the second transparent protective layer 30 include polycarbonate resin, polyester resin, acrylic resin, polyolefin resin (particularly cycloolefin polymer), cellulose resin, and the like. Can be mentioned. Among these transparent resin materials, polycarbonate or polyester resin is preferable because of its high transparency and heat resistance.
The transparent resin materials may be used alone or in combination of two or more.
The thickness of the first transparent protective layer 20 and the second transparent protective layer 30 is preferably 0.01 mm or more and 0.5 mm or less, and more preferably 0.1 mm or more and 0.2 mm or less. If the thickness of the first transparent protective layer 20 and the second transparent protective layer 30 is equal to or more than the lower limit value, the louver layer 10 can be sufficiently protected, and if the thickness is equal to or less than the upper limit value, sufficient light transmittance can be secured. .
The first transparent protective layer 20 and the second transparent protective layer 30 may be the same or different.

(Method of manufacturing viewing angle control body)
The viewing angle control body 1 of the present embodiment can be manufactured by a method including a louver layer forming step, a first transparent protective layer laminating step, and a second transparent protective layer laminating step. Further, the louver layer forming step includes a laminated body forming step, a block body forming step, and a cutting step.

[Laminate formation process]
The laminated body forming step is a step of alternately laminating a plurality of light transmission band sheets and a plurality of light shielding band sheets to form a laminated body.
In the laminated body forming step of the present embodiment, a laminated body having three laminated units is formed. That is, the laminated body forming step in this embodiment includes a first laminated unit forming step, a second laminated unit forming step, and a third laminated unit forming step.
The first laminated unit forming step is a step of forming a first laminated unit by alternately laminating a plurality of first light transmission band sheets and a plurality of first light shielding band sheets.
The second laminated unit forming step is a step of forming a second laminated unit by alternately laminating a plurality of second light transmitting band sheets and a plurality of second light shielding band sheets that are thinner than the first light transmitting band sheet. Is.
The third laminated unit forming step is a step of forming a third laminated unit by alternately laminating a plurality of third light transmitting band sheets and a plurality of third light shielding band sheets that are thicker than the second light transmitting band sheet. Is.
In the laminated body forming step of the present embodiment, the second laminated unit is arranged between the first laminated unit and the third laminated unit.
The first laminated unit becomes the first end region 1a, the second laminated unit becomes the central region 1c, and the third laminated unit becomes the second end region 1b.

The following method is mentioned as a concrete method of the said laminated body formation process.
First, the first laminated unit, the second laminated unit, and the third laminated unit are individually prepared in advance. That is, the plurality of first light-transmitting band sheets and the plurality of first light-shielding band sheets are alternately laminated to form a first laminated unit. A plurality of second light-transmitting band sheets and a plurality of second light-shielding band sheets are alternately laminated to form a second laminated unit. A plurality of third light transmitting band sheets and a plurality of third light shielding band sheets are alternately laminated to form a third laminated unit. At that time, the light-transmitting band sheet and the light-shielding band sheet may be bonded with an adhesive.
Next, the first stacked unit is stacked on one surface of the second stacked unit, and the third stacked unit is stacked on the other surface of the second stacked unit to form a stacked body. An adhesive may be used when laminating the laminated units.

The following method is mentioned as another specific method of the said laminated body formation process.
That is, first, a plurality of first light-transmitting band sheets and a plurality of first light-shielding band sheets are alternately laminated to form a first laminated unit. Next, a plurality of second light-transmitting band sheets and a plurality of second light-shielding band sheets are alternately stacked on one surface of the first stacked unit to form a second stacked unit. Next, on the other surface of the second laminated unit, a plurality of third light transmission band sheets and a plurality of second light shielding band sheets are alternately laminated to form a third laminated unit, and a laminated body is formed. Form.

In the laminated body forming step, the average value of the thickness of the plurality of sheets for the second light transmission band is preferably in the range of 50 μm or more and less than 200 μm, and more preferably in the range of 100 μm or more and 150 μm or less. If the average value of the thickness of the plurality of sheets for the second light transmission band is equal to or more than the lower limit value, the light transmittance in the central region 1c can be sufficiently secured, and if it is less than the upper limit value, the peep prevention property is Get higher.
In the present specification, the average value of the thicknesses of the plurality of sheets is a value obtained by measuring the thicknesses of the plurality of sheets by the above-described thickness measuring method and averaging the obtained values.
The thickness of the second light transmission band sheet corresponds to the width of the light transmission band 11 in the central region 1c.
The average value of the thickness of the plurality of sheets for the first light transmission band and the average value of the thickness of the plurality of sheets of the third light transmission band are more than the average value of the thickness of the plurality of second light transmission band sheets. Also, the thickness is preferably in the range of 1 μm or more and 30 μm or less, and more preferably in the range of 5 μm or more and 15 μm or less. Difference between the average value of the thickness of the plurality of sheets for the first light transmission band and the average value of the thickness of the sheets of the third light transmission band and the average value of the thickness of the plurality of second light transmission band sheets Is more than the lower limit value, the visibility of the image in the first end region 1a and the second end region 1b becomes higher, and if less than the upper limit value, the light transmittance of the regions adjacent to each other. The difference becomes smaller, and the difference in visual shade becomes smaller. The average value of the thickness of the plurality of sheets for the first light transmission band and the average value of the thickness of the plurality of sheets for the third light transmission band may be the same or different. The thickness of the first light transmission band sheet corresponds to the width of the light transmission band 11 in the first end region 1a, and the thickness of the third light transmission band sheet has the light transmission in the second end region 1b. It corresponds to the width of the strip 11.

In the laminated body forming step, the thickness of each of the plurality of sheets for the second light transmission band is preferably in the range of 50 μm or more and less than 200 μm, and more preferably in the range of 100 μm or more and 150 μm or less. When the thickness of each of the plurality of sheets for the second light transmission band is equal to or more than the lower limit value, the light transmittance in the central region 1c can be sufficiently ensured, and when the thickness is less than the upper limit value, the peep prevention property is more improved. Get higher
The thickness of the second light transmission band sheet corresponds to the width of the light transmission band 11 in the central region 1c.
The thickness of each of the plurality of first light transmission band sheets and each of the plurality of third light transmission band sheets are 1 μm or more and 30 μm or more than the respective thicknesses of the plurality of second light transmission band sheets. The thickness is preferably in the following range, and more preferably in the range of 5 μm or more and 15 μm or less. The thickness of each of the plurality of first light transmission band sheets and the difference between each of the plurality of third light transmission band sheets and each of the plurality of second light transmission band sheets are equal to or more than the lower limit value. If so, the visibility of the image in the first end region 1a and the second end region 1b becomes higher, and if it is not more than the upper limit value, the difference in light transmittance between adjacent regions becomes small, The visual difference in shades becomes smaller. The thickness of the first light transmission band sheet corresponds to the width of the light transmission band 11 in the first end region 1a, and the thickness of the third light transmission band sheet has the light transmission in the second end region 1b. It corresponds to the width of the strip 11.

Further, the average value of the thicknesses of the plurality of first light-shielding band sheets is preferably in the range of 1 μm or more and 50 μm or less, and more preferably in the range of 10 μm or more and 30 μm or less.
The thickness of each of the plurality of first light-shielding band sheets is preferably within a range of 1 μm or more and 50 μm or less, and more preferably within a range of 10 μm or more and 30 μm or less.

  The light transmitting band sheet can be manufactured by molding the resin material forming the light transmitting band 11 into a sheet shape. The light-shielding band sheet can be manufactured by molding the resin material forming the light-shielding band 12 into a sheet shape. The light-transmitting band sheet and the light-shielding band sheet are each formed to have a constant thickness. As a molding method for molding the resin material into a sheet, for example, extrusion molding, calendar molding, press molding or the like can be applied.

[Block forming process]
The block body forming step is a step of pressurizing the laminated body to form a block body.
For pressing the laminate, for example, a roll or a press can be used. At the time of pressurization, it is preferable to heat the sheets to increase the adhesive force between the sheets. The heating temperature is appropriately selected according to the material used. If the heating temperature is too high, the uniformity of the thickness of the sheets may be impaired, and if the heating temperature is too low, the adhesive force between the sheets may be weakened.

[Cutting process]
The cutting step is a step of cutting the block body obtained in the block body forming step to obtain a louver layer. In the present embodiment, as shown in FIG. 2, the block body 100 is cut so that the louver layer 10 has a constant thickness.
As a cutting method in the cutting step, for example, the light transmission band sheet 110 (the first light transmission band sheet 111, the second light transmission band sheet 112, the third light transmission band sheet 113) and the light shielding band sheet 120 are used. The cutting blade is cut perpendicularly to the direction in which the (first light-shielding band sheet 121, the second light-shielding band sheet 122, and the third light-shielding band sheet 123) are arranged alternately, and the light-transmitting band sheet 110 and the light-shielding band are shielded. A method of cutting the band sheet 120 at the same time may be mentioned.
As another cutting method, a cutting blade is vertically cut from one surface of the block body 100 where only the light-transmitting band sheet 110 or only the light-shielding band sheet 120 is exposed, and the cutting blade or the block body is moved to remove light. A method of alternately cutting the transmission band sheet 110 and the light shielding band sheet 120 may be mentioned.

[First transparent protective layer laminating step]
The first transparent protective layer laminating step is a step of laminating the first transparent protective layer on the light emitting side surface of the louver layer obtained by the cutting step.
As a method of laminating the first transparent protective layer, for example, a method of previously forming a material forming the first transparent protective layer into a sheet shape and sticking the obtained transparent sheet to one surface of the louver layer is possible. Can be mentioned. When attaching the transparent sheet, an adhesive may be used, or thermocompression bonding may be performed without using the adhesive.
When an adhesive is used, the adhesive having a high light transmittance after curing is preferable. Specifically, one having a light transmittance of 65% or more, and more preferably 80% or more in the cured adhesive layer alone is used. Specifically, it is preferably 65% or more and 100% or less, and more preferably 80% or more and 100% or less.
Examples of such an adhesive include an epoxy adhesive, a urethane adhesive, an acrylic adhesive, a melamine adhesive, a polyester adhesive, and a silicone adhesive. In addition, the adhesive may be any of a thermosetting adhesive, a multi-liquid reactive adhesive, an ultraviolet curable adhesive, and the like.

[Second transparent protective layer laminating step]
The second transparent protective layer laminating step is a step of laminating the second transparent protective layer on the light incident side surface of the louver layer obtained by the cutting step.
The method for laminating the second transparent protective layer on the louver layer is the same as the method for laminating the first transparent protective layer on the louver layer.

(View angle control image display)
The viewing angle control image display body of the present embodiment includes an image display body and the viewing angle control body provided on the image display surface of the image display body. It is preferable that the size and shape of the viewing angle control body correspond to the display surface of the image display body.
Examples of the image display body include an image display device that displays a video signal, such as a liquid crystal display device or an organic electroluminescence display device. Usually, the display surface (screen) of the image display device is a rectangle whose longitudinal direction is the left-right direction with respect to the user. For this reason, the rectangular viewing angle control body of the present embodiment is arranged such that its longitudinal direction is along the longitudinal direction of the display surface of the image display device.
The image display body may be a printed matter printed on paper or a plastic sheet. The shape of the printed matter is not particularly limited, but the viewing angle control body of the present embodiment is suitable for a rectangular printed matter.
When the display surface of the image display body is rectangular, one having a length in the longitudinal direction of 250 mm or more is useful, and one having a length of 300 mm or more is particularly useful. Practically, the length of the display surface of the image display body in the longitudinal direction is preferably 600 mm or less, and more preferably 500 mm or less. Specifically, the length in the longitudinal direction of the display surface of the image display body is preferably 250 mm or more and 600 mm or less, more preferably 300 mm or more and 500 mm or less. The length of the display surface of the image display body in the lateral direction is preferably 50 mm or more, more preferably 150 mm or more, and further preferably 175 mm or more. On the other hand, practically, the length of the display surface of the image display body in the lateral direction is preferably 1000 mm or less, more preferably 500 mm or less, and further preferably 300 mm or less. Specifically, the length in the lateral direction of the display surface of the image display body is preferably 50 mm or more and 1000 mm or less, more preferably 150 mm or more and 500 mm or less, and even more preferably 175 mm or more and 300 mm or less.

The viewing angle control body of the present embodiment is particularly suitable for use in an information input / output device including an image display device with a touch sensor. This is because the information input / output device often displays and inputs confidential information and often requires peep prevention.
The central region of the viewing angle control body of the present embodiment is controlled so that the viewing angle is narrowed, and is a region with a particularly high peep prevention property. Therefore, it is preferable that the central area of the viewing angle control body is overlapped with the area where confidential information is displayed.
The width of the area in which the confidential information is displayed is preferably 20% or more and 80% or less, and more preferably 30% or more and 60% or less, with respect to the length of the image display body in the width direction.
The width of the area in which the confidential information is displayed is preferably 10% or more and 100% or less, and more preferably 10% or more and 90% or less, with respect to the width of the central area of the viewing angle control body.
In the information input / output device, the confidential information is usually displayed near the center of the display surface of the image display body. Therefore, when the viewing angle control body of the present embodiment is provided on the display surface of the image display body, the central area of the viewing angle control body can be easily overlapped with the display of the confidential information, and the confidential information can be peeped. Can be prevented.
When the conventional viewing angle control body is provided on the display surface of the image display body, the image displayed in the end area in the longitudinal direction of the display surface is displayed by the louver layer to the user in front of the central area. It may not fall within the viewing angle range of viewing angle control. Therefore, it is difficult for the user located in front of the central region to visually recognize the image displayed in the end region of the display surface. However, in the viewing angle control body of the present embodiment, the average value of the widths of the plurality of light transmission bands in the first end region and the second end region is smaller than the average value of the widths of the plurality of light transmission bands in the central region. The viewing angle is wide in the first end region and the second end region. Therefore, when a user who is located in front of the central area sees the image displayed in the edge area of the display surface, the image is within the viewing angle range under the viewing angle control, and thus can be easily visually recognized. In addition, since the viewing angle is controlled to be narrow in the first end region and the second end region, the peep prevention property is ensured.

<Second Embodiment>
The viewing angle control body of the second embodiment of the present invention will be described.
FIG. 3 shows the viewing angle control body of the present embodiment. The viewing angle control body 2 of the present embodiment is the same as that of the first embodiment except that the louver layer has a different form.
That is, the louver layer 40 used in the present embodiment includes the first end region 2a, the second end region 2b, and the central region 2c, and the first louver layer 40 between the first end region 2a and the central region 2c. It has an intermediate region 2d and a second intermediate region 2e between the second end region 2b and the central region 2c. The average value of the widths of the plurality of light transmission bands 11 provided in the first intermediate region 2d is narrower than the average value of the widths of the plurality of light transmission bands 11 provided in the first end region 2a, and the central region 2c. It is made wider than the average value of the widths of the plurality of light transmission bands 11 provided in the. The average value of the widths of the plurality of light transmission bands 11 provided in the second intermediate region 2e is narrower than the average value of the widths of the plurality of light transmission bands 11 provided in the second end region 2b, and the central region 2c. It is made wider than the average value of the widths of the plurality of light transmission bands 11 provided in the.
In the present embodiment, the widths of the plurality of light transmission bands 11 provided in the first end region 2a, the widths of the plurality of light transmission bands 11 provided in the second end region 2b, and the central region 2c. The widths of the plurality of light transmission bands 11 provided in the first intermediate region 2d, the widths of the plurality of light transmission bands 11 provided in the first intermediate region 2d, and the plurality of light transmission bands 11 provided in the second intermediate region 2e. The width of each is constant in each area. The widths of the plurality of light transmission bands 11 provided in the first end region 2a and the second end region 2b are wider than the widths of the plurality of light transmission bands 11 provided in the central region 2c. Is similar to the louver layer 10 in the first embodiment.
In the louver layer 40 in the present embodiment, the thickness, the material forming the light transmission band 11, the width of the light shielding band 12, and the material forming the light shielding band 12 are the same as those in the louver layer 10 in the first embodiment. .

The width W _c of the central region 2c varies depending on the object of use of the view angle control body 2, but in many objects of use, 20% or more and 80% or more of the total length of the view angle control body 2 in the longitudinal direction. % Or less, and more preferably 30% or more and 60% or less. When the width W _c of the central area 2c is within the above range, the viewing angle control body 2 of the present embodiment is suitable as a peep prevention body, and the image displayed in the end area of the image display body display surface. The visibility of can be further improved.
Width W _e of the width W _d and the second intermediate region 2e of the first intermediate region 2d may vary depending on use object of the viewing angle control member 2, in many applications the object, the viewing angle control member 2 The total length in the longitudinal direction is preferably 5% or more and 20% or less, more preferably 10% or more and 17.5% or less. If the width W _d and the width W _e of the second intermediate region 2e of the first intermediate region 2d is the lower limit or more, it is possible to reduce the difference in light transmittance between the neighboring regions, reduce the difference between the visual shade it can. If less than the width W _e is the upper limit value of the width W _d and the second intermediate region 2e of the first intermediate region 2d, can be sufficiently ensured visibility peep prevention properties and end regions in the displayed image.
Width W _b of width W _a and a second end region 2b of the first end region 2a is preferably the longitudinal direction of the length of the viewing angle control member 2, is 20% or less than 5%, 10 % Or more and 17.5% or less is more preferable.
And the width W _a of the first end region 2a and the width W _b of the second end region 2b may be the same or different, but usually are identical. The width W _d of the first intermediate region 2d and the width W _e of the second intermediate region 2e may be the same or different, but usually are identical.
When the widths W _a and W _{b of} the first end region 2a and the second end region 2b are the same, the first end region 2a or the second end region 2b with respect to the entire length of the viewing angle control body 2 in the longitudinal direction. ratio of width (%) is (100 - ratio of the width _{W c} of the central region 2c (%) - the percentage of the width _{W d} of the first intermediate region 2d (%) - the width _{W e} of the second intermediate region 2e It is obtained from the formula of ratio (%) / 2.
The widths W _a , W _b , W _c , W _d , and W _{e of} the respective regions referred to here are the lengths of the respective regions in the longitudinal direction of the viewing angle control body 2.

The average value of the widths of the plurality of light transmission bands 11 provided in the central region 2c is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less. When the average value of the widths of the plurality of light transmission bands 11 provided in the central region 2c is equal to or more than the lower limit value, sufficient light transmittance can be secured, and when the average value is less than the upper limit value, the peep prevention property is further improved. Get higher
The average value of the widths of the plurality of light transmission bands 11 provided in the first intermediate region 2d is wider than the average value of the widths of the plurality of light transmission bands 11 provided in the central region 2c in the range of 1 μm or more and 30 μm or less. It is preferable that the width is 5 μm or more and 15 μm or less. If the difference between the average width of the plurality of light transmission bands 11 provided in the first intermediate region 2d and the average width of the plurality of light transmission bands 11 provided in the central region 2c is not less than the lower limit value. , The visibility of the image in the first intermediate region 2d becomes higher, and if it is not more than the upper limit value, the difference in light transmittance between the regions adjacent to each other becomes small, and the difference in visual shading becomes small.
The average value of the widths of the plurality of light transmission bands 11 provided in the first end region 2a is 1 μm or more and 30 μm or less than the average value of the widths of the plurality of light transmission bands 11 provided in the first intermediate region 2d. The range is preferably wide, and more preferably the range is 5 μm or more and 15 μm or less. The difference between the average width of the plurality of light transmission bands 11 provided in the first end region 2a and the average width of the plurality of light transmission bands 11 provided in the first intermediate region 2d is equal to or more than the lower limit value. If so, the visibility of the image in the first end region 2a becomes higher, and if it is not more than the upper limit value, the difference in light transmittance between the regions adjacent to each other becomes small, and the difference in visual shading becomes small. Get smaller.
The average value of the widths of the plurality of light transmission bands 11 provided in the second intermediate region 2e is wider than the average value of the widths of the plurality of light transmission bands 11 provided in the central region 2c in the range of 1 μm or more and 30 μm or less. It is preferable that the width is 5 μm or more and 15 μm or less. If the difference between the average width of the plurality of light transmission bands 11 provided in the second intermediate region 2e and the average width of the plurality of light transmission bands 11 provided in the central region 2c is not less than the lower limit value. , The visibility of the image in the second intermediate region 2e becomes higher, and if it is not more than the upper limit value, the difference in the light transmittance between the regions adjacent to each other becomes small, and the difference in the light and shade becomes small.
The average value of the widths of the plurality of light transmission bands 11 provided in the second end region 2b is 1 μm or more and 30 μm or less than the average value of the widths of the plurality of light transmission bands 11 provided in the second intermediate region 2e. The range is preferably wide, and more preferably the range is 5 μm or more and 15 μm or less. The difference between the average width of the plurality of light transmission bands 11 provided in the second end region 2b and the average width of the plurality of light transmission bands 11 provided in the second intermediate region 2e is equal to or more than the lower limit value. If so, the visibility of the image in the second end region 2b becomes higher, and if it is not more than the upper limit value, the difference in light transmittance between the regions adjacent to each other becomes small, and the difference in visual shading becomes small. Get smaller.

The width of each of the plurality of light transmission bands 11 provided in the central region 2c is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less. If the width of each of the plurality of light transmission bands 11 provided in the central region 2c is equal to or more than the lower limit value, sufficient light transmittance can be ensured, and if less than the upper limit value, the peep prevention property is higher. Become.
The width of each of the plurality of light transmission bands 11 provided in the first intermediate region 2d is made wider than the width of each of the plurality of light transmission bands 11 provided in the central region 2c by 1 μm or more and 30 μm or less. It is preferable that the width is 5 μm or more and 15 μm or less. If the difference between the widths of the plurality of light transmission bands 11 provided in the first intermediate region 2d and the widths of the plurality of light transmission bands 11 provided in the central region 2c is not less than the lower limit value, The visibility of the image in the first intermediate region 2d becomes higher, and if it is equal to or less than the upper limit value, the difference in light transmittance between the regions adjacent to each other becomes small, and the difference in light and shade becomes small.
The width of each of the plurality of light transmission bands 11 provided in the first end region 2a is in the range of 1 μm or more and 30 μm or less than the width of each of the plurality of light transmission bands 11 provided in the first intermediate region 2d. It is preferably widened, and more preferably in the range of 5 μm or more and 15 μm or less. The difference between each width of the plurality of light transmission bands 11 provided in the first end region 2a and each width of the plurality of light transmission bands 11 provided in the first intermediate region 2d is not less than the lower limit value. For example, the visibility of the image in the first end region 2a becomes higher, and if it is not more than the upper limit value, the difference in the light transmittance between the regions adjacent to each other becomes small, and the difference in the light and shade becomes small. .
The width of each of the plurality of light transmission bands 11 provided in the second intermediate region 2e is made wider than the width of each of the plurality of light transmission bands 11 provided in the central region 2c by 1 μm or more and 30 μm or less. It is preferable that the width is 5 μm or more and 15 μm or less. If the difference between the widths of the plurality of light transmission bands 11 provided in the second intermediate region 2e and the widths of the plurality of light transmission bands 11 provided in the central region 2c is equal to or more than the lower limit value, The visibility of the image in the second intermediate region 2e becomes higher, and if it is not more than the upper limit value, the difference in the light transmittance between the regions adjacent to each other becomes small, and the difference in the light and shade becomes small.
The width of each of the plurality of light transmission bands 11 provided in the second end region 2b is in the range of 1 μm or more and 30 μm or less than the width of each of the plurality of light transmission bands 11 provided in the second intermediate region 2e. It is preferably widened, and more preferably in the range of 5 μm or more and 15 μm or less. The difference between the widths of the plurality of light transmission bands 11 provided in the second end region 2b and the widths of the plurality of light transmission bands 11 provided in the second intermediate region 2e is not less than the lower limit value. For example, the visibility of the image in the second end region 2b becomes higher, and if it is not more than the upper limit value, the difference in the light transmittance between the regions adjacent to each other becomes small, and the difference in the light and shade becomes small. .

  Difference between the average width of the plurality of light transmission bands 11 in the first end region 2a and the average width of the plurality of light transmission bands 11 in the first intermediate region 2d, the plurality of light transmission bands in the first intermediate region 2d Difference between the average value of the widths of the plurality of light transmission bands 11 in the central region 2c and the average value of the widths of the plurality of light transmission bands 11 in the second end region 2b and the second intermediate region 2e. And the average value of the widths of the plurality of light transmission bands 11 in the second intermediate region 2e and the average value of the widths of the plurality of light transmission bands 11 in the central region 2c. Is adjusted so that the difference in viewing angle is preferably 15 ° or less, more preferably 0.5 ° or more and 10 ° or less, still more preferably 1 ° or more and 5 ° or less. As the viewing angle increases, the light transmittance increases. Therefore, when the viewing angle difference is large, the difference in the light transmittance between the regions adjacent to each other is large, and the difference in light and shade looks visually large, The appearance of the viewing angle control body 2 is impaired. When the difference in the viewing angle is equal to or less than the upper limit value, the difference in the light transmittance between the areas adjacent to each other becomes small, and the difference in the light and shade between the areas becomes small.

In the present embodiment, the installation angles of the shading bands 12 provided in the first end region 2a, the second end region 2b, the central region 2c, the first intermediate region 2d, and the second intermediate region 2e are all the same. The "same" of the installation angle mentioned here includes the range of the installation angle design value ± 2 °.
The specific installation angle of the light-shielding band 12 is preferably 0 ° or more and 3 ° or less, more preferably 0 ° or more and 1 ° or less. If the installation angle of the light-shielding band 12 provided in the first end region 2a, the second end region 2b, the central region 2c, the first intermediate region 2d, and the second intermediate region 2e is less than or equal to the above upper limit value, peek More preventive.

A manufacturing method for manufacturing the viewing angle control body 2 of the present embodiment will be described.
The manufacturing method of the viewing angle control body 2 of the present embodiment is the same as that of the first embodiment except that the laminated body forming step and the cutting step are different.

The laminated body forming step is a step of forming a laminated body by alternately laminating a plurality of light transmission band sheets and a plurality of light shielding band sheets, and forms a laminated body having five laminated units. That is, the laminated body forming step in this embodiment includes a first laminated unit forming step, a second laminated unit forming step, a third laminated unit forming step, a fourth laminated unit forming step, and a fifth laminated unit forming step.
The first laminated unit forming step is a step of forming a first laminated unit by alternately laminating a plurality of first light transmission band sheets and a plurality of first light shielding band sheets.
The second laminated unit forming step is a step of forming a second laminated unit by alternately laminating a plurality of second light transmitting band sheets and a plurality of second light shielding band sheets that are thinner than the first light transmitting band sheet. Is.
The third laminated unit forming step is a step of forming a third laminated unit by alternately laminating a plurality of third light transmitting band sheets and a plurality of third light shielding band sheets that are thicker than the second light transmitting band sheet. Is.
In the fourth lamination unit forming step, a plurality of fourth light transmission band sheets thinner than the first light transmission band sheet and thicker than the second light transmission band sheet and a plurality of fourth light shielding band sheets are alternately laminated. Is a step of forming a fourth laminated unit.
In the fifth lamination unit forming step, a plurality of fifth light transmission band sheets thinner than the third light transmission band sheet and thicker than the second light transmission band sheet and a plurality of fifth light shielding band sheets are alternately laminated. Is a step of forming a fifth laminated unit.
In the laminated body forming step of the present embodiment, the fourth laminated unit is arranged between the first laminated unit and the second laminated unit, and the fifth laminated unit is arranged between the second laminated unit and the third laminated unit. Then, the second laminated unit is arranged between the fourth laminated unit and the fifth laminated unit.
The first laminated unit serves as the first end region 2a, the second laminated unit serves as the central region 2c, the third laminated unit serves as the second end region 2b, and the fourth laminated unit serves as the first laminated unit. It becomes the intermediate region 2d, and the fifth laminated unit becomes the second intermediate region 2e.

The following method is mentioned as a concrete method of the said laminated body formation process.
First, the first laminated unit, the second laminated unit, the third laminated unit, the fourth laminated unit, and the fifth laminated unit are individually prepared in advance. That is, the plurality of first light transmission band sheets and the plurality of light shielding band sheets are alternately laminated to form a first laminated unit. A plurality of second light-transmitting band sheets and a plurality of second light-shielding band sheets are alternately laminated to form a second laminated unit. A plurality of third light transmitting band sheets and a plurality of third light shielding band sheets are alternately laminated to form a third laminated unit. A plurality of fourth light-transmitting band sheets and a plurality of fourth light-shielding band sheets are alternately laminated to form a fourth laminated unit. A plurality of fifth light-transmitting band sheets and a plurality of fifth light-shielding band sheets are alternately laminated to form a fifth laminated unit. At that time, the light-transmitting band sheet and the light-shielding band sheet may be bonded with an adhesive.
Then, the fourth stacked unit is stacked on one surface of the second stacked unit. Further, the fifth laminated unit is laminated on the other surface of the second laminated unit. Further, the first laminated unit is laminated on the surface of the fourth laminated unit opposite to the second laminated unit. The third laminated unit is laminated on the surface of the fifth laminated unit opposite to the second laminated unit to form a laminated body. An adhesive may be used when laminating the laminated units.

The following method is mentioned as another specific method of the said laminated body formation process.
That is, first, a plurality of first light-transmitting band sheets and a plurality of first light-shielding band sheets are alternately laminated to form a first laminated unit. Next, a plurality of fourth light transmission band sheets and a plurality of fourth light shielding band sheets are alternately stacked on one surface of the first stacked unit to form a fourth stacked unit. Then, a plurality of second light transmission band sheets and a plurality of second light shielding band sheets are alternately laminated on the surface of the fourth lamination unit opposite to the first lamination unit to form the second lamination unit. Form. Then, a plurality of fifth light-transmitting band sheets and a plurality of fifth light-shielding band sheets are alternately laminated on the surface of the second laminated unit opposite to the fourth laminated unit to form the fifth laminated unit. Form. Then, a plurality of third light transmission band sheets and a plurality of third light shielding band sheets are alternately laminated on the surface of the fourth lamination unit opposite to the second lamination unit to form the third lamination unit. Then, the laminated body is formed.

In the laminated body forming step, the average value of the thickness of the plurality of sheets for the second light transmission band is preferably in the range of 50 μm or more and less than 200 μm, and more preferably in the range of 100 μm or more and 150 μm or less. If the average value of the thicknesses of the plurality of sheets for the second light transmission band is equal to or more than the lower limit value, the light transmittance in the central region 2c can be sufficiently ensured, and if it is less than the upper limit value, the peep prevention property is improved. Get higher.
The thickness of the second light transmission band sheet corresponds to the width of the light transmission band 11 in the central region 2c.
The average value of the thickness of the plurality of sheets for the fourth light transmission band is preferably thicker than the average value of the thickness of the plurality of sheets of the second light transmission band in the range of 1 μm or more and 30 μm or less, and 5 μm or more and 15 μm or less Is more preferable in the range of. If the difference between the average value of the thickness of the plurality of sheets for the fourth light transmission band and the average value of the thickness of the plurality of sheets for the second light transmission band is set to the lower limit value or more, the image in the first intermediate region 2d The visibility becomes higher, and when it is not more than the upper limit value, the difference in the light transmittance between the areas adjacent to each other becomes small, and the difference in the light and shade becomes small. The thickness of the fourth light transmission band sheet corresponds to the width of the light transmission band 11 in the first intermediate region 2d.
The average value of the thicknesses of the plurality of sheets for the first light transmission band is preferably larger than the average value of the thickness of the plurality of sheets for the fourth light transmission band in the range of 1 μm or more and 30 μm or less, and 5 μm or more and 15 μm or less Is more preferable in the range of. If the difference between the average value of the thickness of the plurality of sheets for the first light transmission band and the average value of the thickness of the plurality of sheets for the fourth light transmission band is set to the lower limit value or more, in the first end region 2a. If the visibility of the image becomes higher, and if it is less than or equal to the upper limit value, the difference in light transmittance between the areas adjacent to each other becomes small, and the difference in light and shade becomes small. The thickness of the sheet for the first light transmission band corresponds to the width of the light transmission band 11 in the first end region 2a.
The average value of the thickness of the plurality of sheets for the fifth light transmission band is preferably thicker in the range of 1 μm or more and 30 μm or less than the average value of the thickness of the plurality of sheets of the second light transmission band, and 5 μm or more and 15 μm or less. Is more preferable in the range of. If the difference between the average value of the thicknesses of the plurality of fifth light transmission band sheets and the average value of the thicknesses of the plurality of second light transmission band sheets is set to the lower limit value or more, the image in the second intermediate region 2e The visibility becomes higher, and when it is not more than the upper limit value, the difference in the light transmittance between the areas adjacent to each other becomes small, and the difference in the light and shade becomes small. The thickness of the fifth light transmission band sheet corresponds to the width of the light transmission band 11 in the second intermediate region 2e.
The average value of the thicknesses of the plurality of third light transmission band sheets is preferably thicker than the average value of the plurality of fifth light transmission band sheets in the range of 1 μm or more and 30 μm or less, and 5 μm or more and 15 μm or less Is more preferable in the range of. If the difference between the average value of the thicknesses of the plurality of sheets for the third light transmission band and the average value of the thicknesses of the plurality of sheets for the fifth light transmission band is made equal to or more than the lower limit value, in the second end region 2b. If the visibility of the image becomes higher, and if it is less than or equal to the upper limit value, the difference in light transmittance between the areas adjacent to each other becomes small, and the difference in light and shade becomes small. The thickness of the third light transmission band sheet corresponds to the width of the light transmission band 11 in the second end region 2b.
The average value of the thickness of the plurality of sheets for the first light transmission band and the average value of the thickness of the plurality of sheets for the third light transmission band may be the same or different, or the plurality of fourth light transmission bands may be transmitted. The average value of the thickness of the band sheet and the average value of the thickness of the plurality of fifth light transmission band sheets may be the same or different.

In the laminated body forming step, the thickness of each of the plurality of sheets for the second light transmission band is preferably in the range of 50 μm or more and less than 200 μm, and more preferably in the range of 100 μm or more and 150 μm or less. When the thickness of each of the plurality of sheets for the second light transmission band is equal to or more than the lower limit value, the light transmittance in the central region 2c can be sufficiently ensured, and when the thickness is less than the upper limit value, the peep prevention property is further improved. Get higher
The thickness of the second light transmission band sheet corresponds to the width of the light transmission band 11 in the central region 2c.
The thickness of each of the plurality of sheets for the fourth light transmission band is preferably larger than the thickness of each of the plurality of sheets for the second light transmission band in the range of 1 μm or more and 30 μm or less, and in the range of 5 μm or more and 15 μm or less. More preferably it is thick. If the difference between the respective thicknesses of the plurality of fourth light transmission band sheets and the respective thicknesses of the plurality of second light transmission band sheets is made equal to or more than the lower limit value, the visibility of the image in the first intermediate region 2d is improved. If it becomes higher and is equal to or less than the upper limit value, the difference in the light transmittance between the regions adjacent to each other becomes small, and the difference in the visual shading becomes small. The thickness of the fourth light transmission band sheet corresponds to the width of the light transmission band 11 in the first intermediate region 2d.
The thickness of each of the plurality of sheets for the first light transmission band is preferably thicker than the thickness of each of the plurality of sheets for the fourth light transmission band in the range of 1 μm or more and 30 μm or less, and in the range of 5 μm or more and 15 μm or less. More preferably it is thick. If the difference between the thickness of each of the plurality of sheets for the first light transmission band and the thickness of each of the plurality of sheets for the fourth light transmission bands is set to the lower limit value or more, the visibility of the image in the first end region 2a Is higher and is not more than the upper limit value, the difference in light transmittance between the areas adjacent to each other is reduced, and the difference in visual shading is reduced. The thickness of the sheet for the first light transmission band corresponds to the width of the light transmission band 11 in the first end region 2a.
The thickness of each of the plurality of fifth light transmission band sheets is preferably 1 μm or more and 30 μm or less, and preferably 5 μm or more and 15 μm or less, than the thickness of each of the plurality of second light transmission band sheets. More preferably it is thick. If the difference between the respective thicknesses of the plurality of fifth light transmission band sheets and the respective thicknesses of the plurality of second light transmission band sheets is made equal to or more than the lower limit value, the visibility of the image in the second intermediate region 2e is improved. If it becomes higher and is equal to or less than the upper limit value, the difference in the light transmittance between the regions adjacent to each other becomes small, and the difference in the visual shading becomes small. The thickness of the fifth light transmission band sheet corresponds to the width of the light transmission band 11 in the second intermediate region 2e.
The thickness of each of the plurality of third light transmission band sheets is preferably thicker than each of the plurality of fifth light transmission band sheets in the range of 1 μm or more and 30 μm or less, preferably in the range of 5 μm or more and 15 μm or less. More preferably it is thick. If the difference between the thickness of each of the plurality of sheets for the third light transmission band and the thickness of each of the plurality of sheets for the fifth light transmission bands is made equal to or more than the lower limit value, the visibility of the image in the second end region 2b is improved. Is higher and is not more than the upper limit value, the difference in light transmittance between the areas adjacent to each other is reduced, and the difference in visual shading is reduced. The thickness of the third light transmission band sheet corresponds to the width of the light transmission band 11 in the second end region 2b.

In the cutting step in this embodiment, as shown in FIG. 4, the block body 100 is cut so that the louver layer 40 has a constant thickness.
As a cutting method in the cutting step, for example, the light transmission band sheet 110 (the first light transmission band sheet 111, the second light transmission band sheet 112, the third light transmission band sheet 113, the fourth light transmission band sheet) is used. The sheet 114, the fifth light transmission band sheet 115, and the light blocking band sheet 120 (the first light blocking band sheet 121, the second light blocking band sheet 122, the third light blocking band sheet 123, and the fourth light blocking band sheet 124). The method of cutting the light transmission band sheet 110 and the light shielding band sheet 120 at the same time by cutting a cutting blade perpendicular to the direction in which the fifth light shielding band sheets 125) are alternately arranged.
As another cutting method, a cutting blade is vertically cut from one surface of the block body 100 where only the light-transmitting band sheet 110 or only the light-shielding band sheet 120 is exposed, and the cutting blade or the block body is moved to remove light. A method of alternately cutting the transmission band sheet 110 and the light shielding band sheet 120 may be mentioned.
Through the above cutting step, the louver layer 40 having five regions having different widths of the light transmission band 11 can be formed.

The usage form of the viewing angle control body of the present embodiment is the same as that of the first embodiment. Therefore, by providing the viewing angle control body of the present embodiment on the display surface of the image display body, it is possible to secure the peep prevention property. Also in the present embodiment, the average value of the widths of the plurality of light transmission bands in the first end region and the second end region is wider than the average value of the widths of the plurality of light transmission bands in the central region. The viewing angle is wide in the first end region and the second end region. Therefore, when a user located in front of the central region sees the image displayed in the end region of the display surface, the image falls within the viewing angle range of the viewing angle control, and thus can be easily visually recognized.
Further, in the present embodiment, since the viewing angle control body has the intermediate region, the width of the light transmission band can be finely adjusted as compared with the viewing angle control body of the first embodiment, and the visual field between adjacent regions can be adjusted. The angle difference can be reduced.
In recent years, the display surface of an image display device tends to increase in size, and when a viewing angle control body is provided on the display surface, the visibility of an image displayed in an end region of the display surface tends to decrease. . However, by using the viewing angle control body of the present embodiment that can finely adjust the viewing angle and easily reduce the difference in viewing angle between adjacent regions, even if it is used in an image display device with a large display surface, it is possible to peek. The prevention property and the visibility of the end region can be easily achieved at the same time.

<Third Embodiment>
The viewing angle control body according to the third embodiment of the present invention will be described.
FIG. 5 shows the viewing angle control body of the present embodiment. The viewing angle control body 3 of the present embodiment is the same as that of the first embodiment except that the louver layer has a different form.
The louver layer 50 in the present embodiment also has a first end region 3a, a second end region 3b, and a central region 3c, as in the first embodiment.
Further, in the louver layer 50 in the present embodiment, the width of the light transmission band 11 is gradually increased from the center of the viewing angle control body 3 in the longitudinal direction (X direction) toward the end. Therefore, the widths of the light transmission bands 11 are not the same in each region of the first end region 3a, the second end region 3b, and the central region 3c, and gradually change.

Also in the present embodiment, as in the first embodiment, the width W _c of the central region 3c is preferably 20% or more and 80% or less with respect to the entire length of the viewing angle control body 3 in the longitudinal direction, and 30 % Or more and 60% or less is more preferable.
Width W _b of width W _a and a second end region 3b of the first end region 3a is preferably the longitudinal direction of the length of the viewing angle control element 3, is 20% or less than 5%, 10 % Or more and 17.5% or less is more preferable.
However, in the present embodiment, the width of the light transmission band 11 gradually changes, and it is not easy to visually divide the region. Therefore, for example, in the region near the center, the longitudinal direction of the viewing angle control body 3 is increased. The area of 80% of the length is defined as the central area 3c, and of the remaining areas, the area of 10% of the length of the viewing angle control body 3 in the longitudinal direction is defined as the first end area 3a. The width of the region may be appropriately determined by, for example, defining the region of 10% of the length in the longitudinal direction as the second end region 3b.

Also in the present embodiment, as in the first embodiment, the average value of the widths of the plurality of light transmission bands 11 provided in the central region 3c is preferably 50 μm or more and 200 μm or less, and 100 μm or more and 150 μm or less. Is more preferable. The average value of the widths of the plurality of light transmission bands 11 provided in the first end region 3a and the second end region 3b is greater than the average value of the widths of the plurality of light transmission bands 11 provided in the central region 3c. It is preferably widened in the range of 1 μm or more and 30 μm or less, and more preferably widened in the range of 5 μm or more and 15 μm or less.
Further, the width of each of the plurality of light transmission bands 11 provided in the central region 3c is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less. The widths of the light transmission bands 11 provided in the first end region 3a and the second end region 3b are in the range of 1 μm or more and 30 μm or less than the widths of the light transmission bands 11 provided in the central region 3c. It is preferably widened, and more preferably in the range of 5 μm or more and 15 μm or less.
Also in the present embodiment, the difference between the average value of the widths of the plurality of light transmission bands 11 in the first end region 3a and the average value of the widths of the plurality of light transmission bands 11 in the central region 3c, and the second end portion The difference between the average value of the widths of the plurality of light transmission bands 11 in the region 3b and the average value of the widths of the plurality of light transmission bands 11 in the central region 3c is such that the difference in viewing angle is preferably 15 ° or less, more preferably It is adjusted to be 0.5 ° or more and 10 ° or less, more preferably 1 ° or more and 5 ° or less.

  Regarding the thickness of the louver layer 50 in the present embodiment, the material forming the light transmitting band 11, the installation angle of the light shielding band 12, the width of the light shielding band 12, and the material forming the light shielding band 12, the same as in the first embodiment. It is similar to the louver layer 10.

A manufacturing method for manufacturing the viewing angle control body 3 of the present embodiment will be described.
The manufacturing method of the viewing angle control body 3 of the present embodiment is the same as that of the first embodiment except that the laminated body forming step is different.
In the laminated body forming step of the present embodiment, a laminated body is formed by using a plurality of light transmission band sheets having gradually different thicknesses. That is, in the laminated body forming step in the present embodiment, a step of forming a laminated body by alternately laminating a plurality of light-transmitting band sheets and a plurality of light-shielding band sheets, wherein the intended thickness of the laminated body is The thickness of the light-transmitting band sheet to be laminated on the light-shielding band sheet is gradually reduced until the light-transmitting sheet is laminated on the light-shielding band sheet until the target thickness of the laminated body is reached. The thickness of the band sheet is gradually increased. As a result, a laminated body is formed in which the thickness of the light transmission band sheet increases from the center of the laminated body toward the end.
Specifically, in the method for manufacturing the viewing angle control body 3 of the present embodiment, the step (a) of stacking the light-shielding band sheet a on the light-transmitting band sheet a includes the step of laminating the light-shielding band sheet a with the light. Step (c) of stacking a sheet c for light transmission band, which is thinner than the sheet a for light transmission band, and subsequently laminating a sheet c for light shielding band on the sheet c for light transmission band, on the sheet c for light shielding band. A step (b) of laminating a light transmission band sheet b thicker than the light transmission band sheet c and subsequently laminating a light shielding band sheet b on the light transmission band sheet b is included.
Wherein the step (a) laminating a light-shielding band sheet a ₁ on the light transmission band sheet a _1, a thin light transmission band than the light transmission band sheet a ₁ on the light-shielding band sheet a ₁ laminating the use sheet a _2, and laminating a light-shielding band sheet a ₂ on the optical transmission band sheet a _2, including.
The step (c) laminating a sheet c ₁ for a thin light transmission band than the light transmission band sheet a ₂ on the light-shielding band sheet a _2, shading on the light transmission band sheet c ₁ laminating a strip sheet c _1, laminating the thin light transmission band sheet c ₂ than the light transmission band sheet c ₁ on the light-shielding band sheet c _1, wherein the light transmission band sheet c ₂ laminating a light-shielding band sheet c ₂ above, laminating the sheet c ₃ for thick light transmission band than the light transmission band sheet c ₂ on the light-shielding band sheet c _2, and the light transmission band stacking the sheets c ₃ for shielding band on the use sheet c _3, including.
The step (b), laminating a sheet b ₁ for thick light transmission band than the light transmission band sheet c ₃ on the light-shielding band sheet c _3, shading on the light-transmitting band sheet b ₁ laminating a strip sheet b _1, laminating the thick light transmission band sheet b ₂ than the light transmission band sheet b ₁ on the light-shielding band sheet b _1, and the light transmission band sheet b ₂ Stacking the light-shielding band sheet b ₂ on the top.
The louver layer 50 in which the width of the light transmission band 11 is gradually increased from the center to the end in the X direction can be formed by cutting the thus obtained laminated body in the cutting process.

The usage form of the viewing angle control body of the present embodiment is the same as that of the first embodiment. Therefore, by providing the viewing angle control body of the present embodiment on the display surface of the image display body, it is possible to secure the peep prevention property. Also in the present embodiment, the average value of the widths of the plurality of light transmission bands in the first end region and the second end region is made wider than the average value of the widths of the plurality of light transmission bands in the central region, The viewing angle in the first end region and the second end region is wide. Therefore, when the user who is located in front of the central area sees the image displayed in the end area of the display surface, the image is within the viewing angle range of the viewing angle control, and thus can be easily visually recognized.
Particularly, in the viewing angle control body of the present embodiment, since the width of the light transmission band gradually increases from the center in the longitudinal direction toward the end, the viewing angle gradually increases from the center in the longitudinal direction toward the end. Has become. Therefore, it becomes easier to achieve both the peep prevention property and the visibility of the image displayed in the end region. Further, the difference in shading between the adjacent regions can be reduced, and the appearance of the viewing angle control body can be improved.

<Other embodiments>
The present invention is not limited to the above embodiment.
For example, the light transmission band and the light blocking band do not have to be formed along the Y direction, and may be formed obliquely with respect to the Y direction. When the light transmitting band and the light blocking band are formed obliquely with respect to the Y direction, the inclination angle is, for example, 1 ° or more and 20 ° or less with respect to the Y direction. When the viewing angle control body is provided on the surface of the liquid crystal display device, it is possible to easily suppress the occurrence of interference fringes by using a light transmission band and a light blocking band formed obliquely with respect to the Y direction.
When the light transmitting band and the light blocking band are formed obliquely with respect to the Y direction, the shape of each region becomes a trapezoid or a parallelogram.
Further, in the case where the light transmission band and the light blocking band are formed along the Y direction as in the above-described embodiment, in order to prevent the occurrence of interference fringes, in the lateral direction (Y direction) of the screen of the liquid crystal display device. The viewing angle control body may be provided on the screen so that the light transmission band and the light blocking band are arranged obliquely with respect to the direction). The inclination angle in that case is also set to 1 ° or more and 20 ° or less with respect to the Y direction, for example.

The installation angles of the light-shielding bands in each area may not be the same. For example, the installation angle of the light-shielding band in the first end region and the installation angle of the light-shielding band in the central region may be different, or the installation angle of the light-shielding band in the second end region and the installation angle of the light-shielding band in the central region may be different. And may be different. The installation angle of the light-shielding band in the first intermediate region may be different from the installation angle of the light-shielding band in the central region, or the installation angle of the light-shielding band in the second intermediate region and the installation angle of the light-shielding band in the central region may be different. Good. The installation angle of the light-shielding band in the first intermediate region may be different from the installation angle of the light-shielding band in the first end region, or the installation angle of the light-shielding band in the second intermediate region and the light-shielding band in the second end region may be different. The installation angle may be different.
However, since the viewing angle control body can be easily manufactured, it is preferable that the installation angles of the light shielding bands are the same throughout the viewing angle control body.

In the first embodiment and the second embodiment, the width of the light transmission band is the same in each region. However, in the present invention, a region in which the width of the light transmission band gradually changes and a region in which the width of the light transmission band is the same may be mixed. For example, in the first end region and the second end region of the first and second embodiments, the width of the light transmission band may gradually increase as the distance from the central region increases. Similarly, in the first end region and the second end region of the second embodiment, the width of the light transmission band may gradually increase as the distance from the central region increases. Further, in the first intermediate region and the second intermediate region of the second embodiment, the width of the light transmission band may gradually increase as the distance from the central region increases. The width of the light transmission band may be the same in the first end region and the second end region of the third embodiment.
Further, the first intermediate region and the second intermediate region of the third embodiment may be further divided into a plurality of regions, and the width of the light transmission band may be different in each of the divided regions. However, even in that case, the width of the light transmission band provided in the region far from the central region is made larger than the width of the light transmission band provided in the region closer to the central region. The width of the light transmission band in each of the divided regions may be the same or may be changed gradually.

In the present invention, the viewing angle control body does not have to be rectangular, and may be, for example, square or another shape (diamond, polygon other than quadrangle, perfect circle, ellipse, etc.). However, since the screen of the image display device is usually rectangular, correspondingly, the viewing angle control body of the present invention is preferably rectangular as in the above embodiment.
When the view angle control body is not rectangular, the first end region is a region including one end of the view angle control body in any one direction A along the surface direction of the view angle control body, and the second end region. The partial area is an area including the other end of the viewing angle control body in the direction A. The central region is a region between the first end region and the second end region. The direction A is appropriately determined according to the shape of the viewing angle control body, the shape of the image display body, or the like, and for example, the direction A may be a direction perpendicular to the light shield band and the longitudinal direction of the light shield band.

In the viewing angle control body of the present invention, an adhesive layer may be provided on at least one of the surface of the transparent protective layer on the light emitting side and the surface of the transparent protective layer on the light incident side. This adhesive layer is a layer formed of a highly transparent pressure-sensitive adhesive or adhesive, and is a layer for fixing the viewing angle control body to an adherend such as an image display or a touch panel.
The adhesive layer preferably has a light transmittance of 75% or more when light is incident along the Z direction, and more preferably 85% or more. Specifically, it is preferably 75% or more and 100% or less, and more preferably 85% or more and 100% or less.
When the adhesive layer is composed of a pressure-sensitive adhesive, as the pressure-sensitive adhesive, for example, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, a rubber pressure-sensitive adhesive or the like can be used. Further, an elastomer can be used as the adhesive. Specific examples of the elastomer include silicone rubber, silicone gel, urethane rubber, urethane gel and the like. Among these, silicone rubber is preferable because of less adhesive residue and high transparency.
The adhesive may be removable. As the removable pressure-sensitive adhesive, commercially available pressure-sensitive adhesives can be used without limitation.
When the pressure-sensitive adhesive is made of an elastomer, the surface of the adhesive layer is mirror-finished to obtain removability.
When the adhesive layer is made of an adhesive, an acrylic adhesive, a urethane adhesive, or the like can be used as the adhesive. Among these adhesives, acrylic adhesives are preferable because of their high adhesive strength.
The pressure-sensitive adhesive and the adhesive may be used alone or in combination of two or more.
As a method of laminating the adhesive layer, for example, a method of applying an adhesive to the surface of the release sheet to form an adhesive layer and then laminating the adhesive layer to a transparent protective layer and laminating it Can be mentioned. Further, as another method for laminating the adhesive layer, the adhesive for forming an adhesive layer is directly applied to the transparent protective layer to form an adhesive layer, and a release sheet is formed on the adhesive layer as necessary. The method of laminating is mentioned.

Further, the viewing angle control body of the present invention may not include at least one of the first transparent protective layer and the second transparent protective layer, and may include an adhesive layer instead. That is, the viewing angle control body in which the first transparent protective layer is provided on the light emitting side surface of the louver layer and the adhesive layer is provided on the light incident side surface, and the louver layer is attached to the light emitting side surface. The viewing angle control body may be one in which the attachment layer is provided and the second transparent protective layer is provided on the surface on the light incident side.
Further, in the present invention, at least one of the first transparent protective layer and the adhesive layer may not be included.

When the viewing angle control body of the present invention is used in an information input / output device equipped with an image display device with a touch sensor, the viewing angle control body is usually arranged between the image display device and the touch panel.
When manufacturing the information input / output device, the touch panel may be attached to the view angle control body after attaching the view angle control body to the image display body, or the view angle control may be performed after attaching the view angle control body to the touch panel. An image display body may be attached to the body.
At the time of attachment, the adhesive layer provided on the viewing angle control body may or may not be used.

Further, in the present invention, for example, in a region near the center, a region of 80% of the length of the rectangular view angle control body in the longitudinal direction is defined as a central region, and the remaining region in the longitudinal direction of the view angle control unit is defined. For example, when the region width is determined, the region of 10% of the length is the first end region and the region of 10% of the length of the viewing angle control body is the second end region. The average width of the light transmission bands provided in the first end region and the second end region is wider than the average width of the light transmission bands provided in the central region.
The average width of the light transmission band can be obtained by measuring the widths of all the light transmission bands in each area in a cross-sectional photograph of the viewing angle control body or the louver layer alone, and averaging those values. .

Examples will be shown below, but the present invention is not limited to these examples.
(Example 1)
A viewing angle control body having the configuration shown in FIG. 1 was manufactured.
First, a 190 μm-thick first light transmission band sheet and a third light transmission band sheet made of transparent silicone rubber (trade name; KE153U, manufactured by Shin-Etsu Chemical Co., Ltd.) were prepared. Further, a 150 μm-thick second light transmission band sheet made of transparent silicone rubber (trade name; KE153U, manufactured by Shin-Etsu Chemical Co., Ltd.) was prepared.
Separately from this, a light-shielding band sheet having a thickness of 20 μm made of a material in which 15 parts by mass of carbon black was added to 100 parts by mass of transparent silicone rubber (trade name; KE153U, manufactured by Shin-Etsu Chemical Co., Ltd.) was prepared. This was used as a first light-shielding band sheet, a second light-shielding band sheet, and a third light-shielding band sheet.
A plurality of first light transmission band sheets and a plurality of first light shielding band sheets were alternately laminated to form a first laminated unit. A plurality of second light transmitting band sheets and a plurality of second light shielding band sheets were alternately laminated to form a second laminated unit. A plurality of third light transmitting band sheets and a plurality of third light shielding band sheets were alternately laminated to form a third laminated unit.
Next, the three laminated units were bonded to form a laminated body so that the second laminated unit was arranged between the first laminated unit and the third laminated unit. The laminated body was heated and pressed to obtain a block body in which three laminated units were integrated. Next, the block body was sliced perpendicularly to the surface of each sheet to obtain a louver layer 10.
Then, a polycarbonate sheet (first transparent protective layer 20) coated with a thermosetting adhesive (Shin-Etsu Chemical Co., Ltd., trade name; KE1825) is attached to the surface of the obtained louver layer 10 which is the light emitting side. The adhesive was heat cured.
Then, a polycarbonate sheet (second transparent protective layer 30) coated with a thermosetting adhesive (Shin-Etsu Chemical Co., Ltd., trade name: KE1825) is attached to the surface of the obtained louver layer 10 which becomes the light incident side. The adhesive was heat cured. As a result, a viewing angle control body having a rectangular shape in plan view, a length in the longitudinal direction of 340 mm and a length in the lateral direction of 200 mm was obtained.
The obtained viewing angle control body was placed on a paper surface on which an image was printed on the entire surface, and the peep prevention property and the image visibility of the end area of the display surface were visually observed and evaluated. At that time, the distance between the eyes and the paper surface was set to 300 mm.
The viewing angle control body of this example had a peep prevention property not only in the central region but also in the end region, and moreover, the image in the end region of the display surface could be sufficiently visually recognized.

(Comparative Example 1)
A viewing angle control body was obtained in the same manner as in Example 1 except that the thickness of the first light transmission band sheet and the thickness of the third light transmission band sheet were both 150 mm.
Also in the viewing angle control body of this example, similarly to Example 1, the peeping prevention property and the visibility of the image in the edge portion of the display surface were visually observed and evaluated.
The viewing angle control body of this example had a peep prevention property in the central region and the end region, but could not visually recognize the image in the end region of the display surface.

INDUSTRIAL APPLICABILITY The viewing angle control body of the present invention is displayed in the end area of the display surface of the image display body while having the peep prevention property that the image is difficult to be visually recognized even if the image displayed by the image display body is peeked. The visibility of the displayed image can be secured.
According to the manufacturing method of the viewing angle control body of the present invention, the viewing angle control body having the above effects can be easily manufactured.
The viewing angle controlled image display of the present invention has a peep prevention property, and the visibility of the image displayed in the end region of the display surface of the image display is secured.

1, 2 and 3 viewing angle control bodies 1a, 2a and 3a first end regions 1b, 2b and 3b second end regions 1c, 2c and 3c central region 2d first intermediate region 2e second intermediate region 10, 40, 50 Louver layer 11 Light transmission band 12 Light shielding band 20 First transparent protection layer 30 Second transparent protection layer 100 Block body 110 Light transmission band sheet 111 First light transmission band sheet 112 Second light transmission band sheet 113 Third Light transmission band sheet 114 Fourth light transmission band sheet 115 Fifth light transmission band sheet 120 Light shielding band sheet 121 First light shielding band sheet 122 Second light shielding band sheet 123 Third light shielding band sheet 124 Fourth Light-shielding band sheet 125 Fifth light-shielding band sheet

Claims (13)

A viewing angle control body comprising a louver layer in which a plurality of light transmission bands and a plurality of light blocking bands are alternately provided,
A first end region including one end of the viewing angle control body in the direction A in which the plurality of light transmission bands and the plurality of light blocking bands are alternately provided; and the viewing angle control body in the direction A. A second end region including the other end, and a central region between the first end region and the second end region,
A viewing angle control body in which widths of the plurality of light transmission bands provided in the first end region and the second end region are wider than widths of the plurality of light transmission bands provided in the central region. .   The view angle control body according to claim 1, wherein the view angle control body is a rectangle in a plan view, and the direction A is a longitudinal direction of the view angle control body.   The average value of the widths of the plurality of light transmission bands provided in the central region is 50 μm or more and 200 μm or less, and the widths of the plurality of light transmission bands provided in the first end region and the second end region are The view angle control body according to claim 1, wherein an average width value is wider than an average width value of the plurality of light transmission bands provided in the central region in a range of 1 μm or more and 30 μm or less.   A first intermediate region is provided between the first end region and the central region, and a second intermediate region is provided between the second end region and the central region, and the first intermediate region is provided in the first intermediate region. The average value of the widths of the plurality of light transmission bands is narrower than the average value of the widths of the plurality of light transmission bands provided in the first end region and the plurality of light beams provided in the central region. The average value of the widths of the plurality of light transmission bands provided in the second intermediate region is wider than the average value of the widths of the transmission bands of the plurality of light transmission bands provided in the second end region. The viewing angle control body according to claim 1, wherein the viewing angle control unit is narrower than an average value of widths and wider than an average value of widths of the plurality of light transmission bands provided in the central region.   The average value of the widths of the plurality of light transmission bands provided in the central region is 50 μm or more and 200 μm or less, and the average value of the widths of the plurality of light transmission bands provided in the first intermediate region is the central region. Is wider than the average value of the widths of the plurality of light transmission bands provided in 1 μm to 30 μm, and the average value of the widths of the plurality of light transmission bands provided in the first end region is the first value. The average value of the widths of the plurality of light transmission bands provided in the second intermediate region is wider than the average value of the widths of the plurality of light transmission bands provided in the first intermediate region in the range of 1 μm or more and 30 μm or less. The average value of the widths of the plurality of light transmission bands provided in the second end region is wider than the average value of the widths of the plurality of light transmission bands in the central region in the range of 1 μm or more and 30 μm or less. Is the width of the plurality of light transmission bands provided in the second intermediate region The viewing angle control body according to claim 4, wherein the viewing angle control body is wider than the average value in the range of 1 μm or more and 30 μm or less. The difference between the viewing angle of the first end region and the viewing angle of the central region is 15 ° or less,
The view angle control body according to claim 1, wherein a difference between a view angle of the central region and a view angle of the second end region is 15 ° or less. The widths of the plurality of light transmission bands in the first end region are the same,
The widths of the plurality of light transmission bands in the second end region are the same,
The viewing angle control body according to any one of claims 1 to 6, wherein the widths of the plurality of light transmission bands in the central region are the same. Forming a laminated body by alternately laminating a plurality of light-transmitting band sheets and a plurality of light-shielding band sheets; forming a block body by pressing the laminated body; A sheet for light transmission band and a plurality of sheets for light-shielding band are cut along the direction in which they are alternately laminated,
Forming the laminated body includes forming a first laminated unit by alternately laminating a plurality of first light transmission band sheets and a plurality of first light shielding band sheets, and forming the first light transmission band. Forming a second laminated unit by alternately laminating a plurality of second light transmission band sheets and a plurality of second light shielding band sheets that are thinner than the second light transmission band sheet; Alternately stacking the third light-transmitting band sheet and the plurality of third light-blocking band sheets to form a third stacked unit, and between the first stacked unit and the third stacked unit, A method of manufacturing a viewing angle control body, comprising disposing a second laminated unit.   The average value of the thickness of the plurality of sheets for the second light transmission band is 50 μm or more and 200 μm or less, and the average value of the thickness of the plurality of sheets for the first light transmission band and the plurality of third light transmission bands The method for manufacturing a view angle control body according to claim 8, wherein the average value of the thickness of the sheet is thicker than the average value of the thickness of the plurality of sheets for the second light transmission band in a range of 1 μm or more and 30 μm or less.   Forming the laminated body further comprises forming a plurality of fourth light transmission band sheets and a plurality of fourth light shielding band sheets that are thinner than the first light transmission band sheet and thicker than the second light transmission band sheet. Are alternately laminated to form a fourth laminated unit, a plurality of fifth light transmission band sheets thinner than the third light transmission band sheet and thicker than the second light transmission band sheet, and a plurality of fifth light transmission band sheets. 5 sheets for shading zones are alternately laminated to form a fifth laminated unit, the fourth laminated unit is arranged between the first laminated unit and the second laminated unit, and the second laminated unit Arranging the fifth laminated unit between a unit and the third laminated unit, and arranging the second laminated unit between the fourth laminated unit and the fifth laminated unit. Viewing angle according to item 8 Manufacturing method of your body.   The average value of the thickness of the plurality of sheets for the second light transmission band is 50 μm or more and 200 μm or less, and the average value of the thickness of the plurality of sheets for the fourth light transmission band is for the plurality of second light transmission bands. It is thicker than the average value of the thickness of the sheet in the range of 1 μm or more and 30 μm or less, and the average value of the thickness of the plurality of first light transmission band sheets is the average of the thickness of the plurality of fourth light transmission band sheets. Thicker in the range of 1 μm or more and 30 μm or less than the value, and the average value of the thickness of the plurality of fifth light transmission band sheets is 1 μm or more and 30 μm than the average value of the thickness of the plurality of second light transmission band sheets. Thick in the following range, the average value of the thickness of the plurality of sheets for the second light transmission band is thicker than the average value of the thickness of the plurality of sheets for the fifth light transmission band in the range of 1 μm or more and 30 μm or less, The method for manufacturing the viewing angle control body according to claim 10.   A viewing angle control image display body comprising: an image display body; and the viewing angle control body according to any one of claims 1 to 7 provided on the image display side of the image display body.   13. The view angle control image display body according to claim 12, wherein confidential information is displayed on the image display body, and a central region of the view angle control body is overlaid on a region where the confidential information is displayed.

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