TW201905871A - Viewing angle control body and manufacturing method thereof, and viewing angle control image display body - Google Patents

Abstract

The viewing angle control body (1) of the present invention contains 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 has a first end region (1a), a second end region (1b) and a central region (1c) provided between the first end region (1a) and the second end region (1b), wherein the light exit side of the plurality of light shielding bands (12) provided in the first end region (1a) and the light exit side of the plurality of light shielding bands (12) provided in the second end region (1b) are inclined toward the center region (1c) side, and the average of installation angles of the plurality of light shielding bands (12) provided in the first end region (1a) and the average of installation angles of the plurality of light shielding bands (12) provided in the second end region (1b) are larger than the average of installation angles of the plurality of light shielding bands (12) provided in the central region (1c).

Description

   Viewing angle control body and manufacturing method thereof, and viewing angle control image display body   

The present invention relates to a viewing angle control body for controlling the viewing angle of an image displayed by an image display device and the like, a method for manufacturing the same, and a viewing angle control image display body having the viewing angle control body.

This application claims priority based on Japanese Patent Application No. 2017-110880 filed in Japan on June 5, 2017, and the contents are cited here.

As for a device for displaying and inputting information, there is an information input / output device equipped with an image display device with a touch panel that is very popular. In this information input / output device, the image displayed on the image display device sometimes contains hidden information, so a sheet-like viewing angle control body is provided on the display surface of the image display device to prevent the front side from being affected In case of discernibility, prevent peeping from the left and right sides and from the opposite side.

As a viewing angle control body for preventing peeping, a louver layer in which a light-transmitting belt and a light-shielding belt are alternately provided, a transparent protective layer provided on one side of the louver layer, and the louver layer are known A laminate formed by laminating transparent adhesive layers on the other side of the surface (Patent Document 1). In addition, there is also known a viewing angle control body in which a louver layer for controlling the viewing angle is used to tilt the shading band to adjust the light emission direction (Patent Document 2).

    [Prior Technical Literature]         [Patent Literature]    

(Patent Document 1) Japanese Patent Application Publication No. 2007-212507

(Patent Document 2) Japanese Patent Laid-Open No. 62-249102

However, when the viewing angle control body as described in Patent Documents 1 and 2 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 enlarged, and the case where the visibility of the image displayed in the end region is lowered in the case of a large display surface is particularly noticeable.

An object of the present invention is to provide an anti-peeping property that makes it difficult to recognize an image even if the image displayed by an image display body such as an image display device is peeped, while also ensuring the end of the display surface of the image display body The visual angle control body of the recognizable visual angle control body of the area display image and the manufacturing method thereof.

In addition, an object of the present invention is to provide a view control image display body having anti-peeping properties while ensuring the visibility of the image displayed on the end area of the display surface of the image display body.

The present invention includes the following aspects.

[1] A viewing angle control body having a louver layer in which a plurality of light-transmitting belts and light-shielding belts are alternately provided, having: a first end region including a viewing angle in a direction A along the plane direction of the aforementioned viewing angle control body One end of the control body; the second end area, including the other end of the viewing angle control body in the aforementioned direction A; and a central area formed between the first end area and the second end area; wherein , The light-shielding strips provided in the first end region and the second end region are inclined with respect to the surface of the viewing angle control body in the form that the light exit side is close to the central region, and the installation angle as specified below , The installation angle of the light-shielding belt provided in the first end region and the second end region is larger than the installation angle of the light-shielding belt provided in the central region, installation angle: perpendicular to the surface of the viewing angle control body The angle of the shading zone is an angle between 0 ° and less than 90 °.

[2] A viewing angle control body according to [1], wherein the viewing angle control system has a rectangular shape in a plan view, and the direction A is the longitudinal direction of the viewing angle control body.

[3] A viewing angle control body as described in [1] or [2], wherein an installation angle of the light-shielding band provided in the first end region and the second end region is 1 ° or more and 20 ° or less , The installation angle of the light-shielding belt provided in the aforementioned central area is above 0 ° and less than 4 °.

[4] A viewing angle control body according to [1] or [2], wherein there is a first intermediate region between the first end region and the central region, and between the second end region and the center There is a second intermediate region between the regions. The installation angle of the shading band of the first intermediate region is smaller than that of the shading band provided in the first end region and is smaller than that of the shading band provided in the central region Large, the installation angle of the light shielding band in the second middle region is smaller than the installation angle of the light shielding band provided in the second end region and larger than the installation angle of the light shielding band provided in the central region.

[5] A viewing angle control body as described in [4], wherein an installation angle of the light-shielding band provided in the first end region and the second end region is 10 ° or more and 20 ° or less, and is provided in the aforementioned The installation angles of the shading bands in the first intermediate region and the second intermediate region are above 1 ° and less than 10 °, and the installation angles of the shading bands provided in the central region are above 0 ° and less than 4 °.

[6] A viewing angle control body according to any one of [1] to [5], wherein the difference in the installation angle of the light-shielding bands in the regions adjacent to each other is greater than 0 ° and not greater than 7.5 °.

[7] A viewing angle control body according to any one of [1] to [6], wherein the installation angle of the light-shielding tape gradually increases from the center toward the end of the viewing angle control body in the aforementioned direction A.

[8] A method for manufacturing a viewing angle control body, comprising: a step of forming a layered body in which a sheet for a light-transmitting belt and a sheet for a light-shielding belt are alternately stacked to form a layered body, and the layered body is pressed A block forming step for forming a block, and a cutting step for cutting the block to form a louver layer with a cutting angle as defined below in the range of 0 ° or more and 20 ° or less, wherein Forming a first cutting region, a second cutting region, and a third cutting region disposed between the first cutting region and the second cutting region, and making the third cutting region The cutting angle is smaller than the cutting angle of the first cutting region and the second cutting region. Cutting angle: It is the angle of the tangent plane at any point on the cutting plane with respect to the vertical direction of the surface of the sheet for light-transmitting tape and the surface of the sheet for light-shielding tape, and is in the range of 0 ° or more and less than 90 ° The angle.

[9] A method for manufacturing a viewing angle control body as described in [8], wherein in the cutting step, the block is cut so that the cut surface becomes a curved surface.

[10] A method of manufacturing a viewing angle control body as described in [9], wherein the radius of curvature of the curved surface is 200 mm or more and 2000 mm or less.

[11] A method for manufacturing a viewing angle control body according to any one of [8] to [10], wherein in the cutting step, the first cut region and the second cut region The cutting angle is 1 ° or more and 20 ° or less, and the cutting angle of the third cutting region is 0 ° or more and less than 4 °.

[12] A method for manufacturing a viewing angle control body according to any one of [8] to [11], wherein in the cutting step, it is between the first cutting region and the third cutting region A fourth cutting region is formed, and a fifth cutting region is formed between the second cutting region and the third cutting region; and the cutting angle of the fourth cutting region is greater than the first cutting region The cutting angle of the area is smaller and larger than the cutting angle of the third cutting area, so that the cutting angle of the fifth cutting area is smaller than the cutting angle of the second cutting area and than the third cutting The cutting angle of the area is large.

[13] A method for manufacturing a viewing angle control body according to [12], wherein in the cutting step, the cutting angle of the first cutting region and the second cutting region is 10 ° or more 20 ° or less, the cutting angle of the third cutting region should be 0 ° or more and less than 4 °, and the cutting angle of the fourth cutting region and the fifth cutting region should be 1 ° or more and less than 10 °.

[14] A viewing angle control image display body comprising: an image display body and the viewing angle control described in any one of the above [1] to [7] provided on an image display surface of the image display body body.

[15] A viewing angle control image display as described in [14], wherein the covert information is displayed on the image display, and the central area of the view control body overlaps with the display of the covert information.

[1] A viewing angle control body provided with a louver layer provided with a plurality of light transmission bands and a plurality of light shielding bands alternately, the view angle control body having: a first end region including a plurality of light transmissions provided alternately One end of the viewing angle control body in the direction A of the belt and the plurality of light-shielding bands; the second end area, including the other end of the viewing angle control body in the direction A; and the first end area and the foregoing A central region between the second end regions; wherein at least a portion of the plurality of light-shielding bands provided in the first end region and the plurality of light-shielding bands provided in the second end region In at least a portion, the light exit side of the shading band is inclined toward the central region side; the average value A of the installation angles of the plurality of shading bands provided in the first end region and the second end region The average value B of the installation angles of the plurality of light-shielding strips is larger than the average value C of the installation angles of the plurality of light-shielding strips provided in the central region; the installation angle is the thickness direction of the viewing angle control body and The acute angle between the center line drawn from the light entrance side to the light exit side of the shading band; the average value A, the average value B, and the average value C are each independently 0 ° or more and not Full 90 °.

[2] A viewing angle control body according to [1], wherein the viewing angle control system has a rectangular shape in a plan view, and the direction A is the longitudinal direction of the viewing angle control body.

[3] A viewing angle control body according to [1] or [2], wherein the average value A and the average value B are each independently 1 ° or more and 20 ° or less, and the average value C is 0 ° or more and Less than 4 °.

[4] A viewing angle control body according to [1] or [2], wherein there is a first intermediate region between the first end region and the central region, and between the second end region and the center There is a second intermediate region between the regions, and the average value D of the installation angles of the plurality of light-shielding strips provided in the first intermediate region is smaller than the average value A and greater than the average value C, and is provided in the second intermediate region The average value E of the installation angles of the plurality of light-shielding bands in the region is smaller than the average value B and larger than the average value C.

[5] A viewing angle control body according to [4], wherein the average value A and the average value B are each independently 10 ° or more and 20 ° or less, and the average value D and the average value E are each independently 1 ° or more and less than 10 °, the aforementioned average C is 0 ° or more and less than 4 °.

[6] A viewing angle control body according to any one of [1] to [3], wherein the difference between the average value A and the average value C is greater than 0 ° and less than 7.5 °, and the average value C The difference from the aforementioned average B is greater than 0 ° and below 7.5 °.

[7] A viewing angle control body according to any one of [1] to [6], wherein the installation angle of the light-shielding band gradually increases from the center of the viewing angle control body along the aforementioned direction A toward the end .

[8] A viewing angle control body according to any one of [1] to [7], wherein the width of the central region is 20% or more and 80% or less with respect to the total length of the longitudinal direction of the viewing angle control body It is better, more than 30% and less than 60%.

[9] A viewing angle control body according to any one of [1] to [8], wherein the width of the first end region and the width of the second end region are larger than the length of the viewing angle control body The total length in the lateral direction is preferably 10% or more and 40% or less, and more preferably 20% or more and 35% or less.

[10] A method for manufacturing a viewing angle control body, comprising: a step of alternately laminating a plurality of sheets for a light-transmitting belt and a plurality of sheets for a light-shielding belt to form a layered body, and pressing the layered body to form a block A step and a step of cutting the block to form a louver layer, wherein the step of forming the louver layer includes making the cutting angle c of the third cutting region larger than the cutting angle a of the first cutting region And the step of cutting the block in such a way that the cutting angle b of the second cutting region is small; the third cutting region is located between the first cutting region and the second cutting region; the cutting The breaking angle a is the acute angle between the thickness direction of the block and the tangent plane at any point on the cutting surface of the first cutting area; the cutting angle b is the thickness direction of the block and An acute angle between a cutting plane of an arbitrary point of the cutting surface of the second cutting region; the cutting angle c is any of the thickness direction of the block and the cutting surface of the third cutting region The acute angle between the point's tangent plane; the aforementioned cutoff angle a The cut-off angle b, c and the angle of the cutting line are each independently 0 ° or more and less than 90 °.

[11] A method of manufacturing a viewing angle control body according to [10], wherein the step of forming the louver layer includes a step of cutting the block so that the cut surface becomes a curved surface.

[12] A method for manufacturing a viewing angle control body as described in [11], wherein the radius of curvature of the curved surface is 200 mm or more and 2000 mm or less.

[13] A method for manufacturing a viewing angle control body according to any one of [10] to [12], wherein in the step of forming the louver layer, the cutting angle a and the cutting angle b are each Independently, it is 1 ° or more and 20 ° or less, and the cutting angle c is 0 ° or more and less than 4 °.

[14] A method for manufacturing a viewing angle control body as described in any one of [10] to [13], wherein the step of forming the louver layer further includes: in the first cut region and the third The step of forming a fourth cut region between the cut regions, and the step of forming a fifth cut region between the second cut region and the third cut region; and the cutting of the fourth cut region The angle d is smaller than the cutting angle a and larger than the cutting angle c, and the cutting angle e of the fifth cutting region is smaller than the cutting angle b and larger than the cutting angle c.

[15] A method for manufacturing a viewing angle control body according to [14], wherein in the step of forming the louver layer, the cutting angle a and the cutting angle b are each independently 10 ° or more and 20 ° Hereinafter, the cutting angle c is 0 ° or more and less than 4 °, and the cutting angle d and the cutting angle e are each independently 1 ° or more and less than 10 °.

[16] A viewing angle control image display body comprising: an image display body and the viewing angle control described in any one of the above [1] to [9] provided on an image display surface of the image display body body.

[17] An angle-of-view control image display as described in [16], wherein the secret information is displayed on the image display body, and the central area of the angle-of-view control body overlaps the area where the secret information is displayed.

In the viewing angle control body of this aspect, it is preferable that the width of the light transmission band is the same throughout the viewing angle control body.

In the viewing angle control body of this aspect, the thickness of the louver layer is preferably fixed.

The viewing angle control body of this aspect preferably further includes: a first transparent protective layer provided on the surface of the louver layer on the light exit side, and a second transparent protective layer provided on the surface of the louver layer on the light entrance side .

In the manufacturing method of the viewing angle control body of this aspect, it is preferable that the thickness of the sheet for a light-transmitting tape is fixed.

In the manufacturing method of the viewing angle control body of this aspect, it is preferable to cut the block so that the thickness of the louver layer is fixed.

The manufacturing method of the viewing angle control body of this aspect preferably further includes: a first transparent protective layer stacking step of layering a first transparent protective layer on the light exit side of the louver layer, and a light entrance side of the louver layer The second transparent protective layer stacking step of the second transparent protective layer of the area layer.

The viewing angle control body of the present invention not only has the anti-peeping property that it is difficult to recognize the image even if the image displayed by the image display body is peeped, but also ensures the image displayed in the end region of the display surface of the image display body Identification.

According to the method for manufacturing a viewing angle control body of the present invention, a viewing angle control body having the above-mentioned effects can be easily manufactured.

The viewing angle control image display body of the present invention has anti-peeping ability, and at the same time ensures the visibility of the image displayed on the end area of the display surface of the image display body.

1, 2, 3‧‧‧view angle control body

1a, 2a, 3a ‧‧‧ first end area

1b, 2b, 3b ‧‧‧ second end area

1c, 2c, 3c‧‧‧Central area

3d‧‧‧First middle area

3e‧‧‧Second middle area

10, 40, 50 ‧‧‧ venetian layer

11‧‧‧Transparent tape

12‧‧‧Shade

20‧‧‧The first transparent protective layer

30‧‧‧Second transparent protective layer

100‧‧‧ block

101a, 102a, 103a ‧‧‧ first cut off area

101b, 102b, 103b

101c, 102c, 103c ‧‧‧ third cut off area

103d‧‧‧ fourth cut off area

103e‧‧‧The fifth cut off area

110‧‧‧Transparent tape sheet

120‧‧‧sheet for shading tape

W _a , W _b , W _c , W _d , W _e ‧‧‧Width

Fig. 1 is a schematic cross-sectional view showing a viewing angle control body according to the first embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining the method of manufacturing the viewing angle control body of the first embodiment.

Fig. 3 is a schematic cross-sectional view showing a viewing angle control body according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining the manufacturing method of the viewing angle control body of the second embodiment.

Fig. 5 is a schematic cross-sectional view showing a viewing angle control body according to a third embodiment of the present invention.

Fig. 6 is a schematic diagram for explaining the manufacturing method of the viewing angle control body of the third embodiment.

    <First embodiment>    

Hereinafter, 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 this embodiment. The viewing angle control body 1 of this embodiment is in a rectangular sheet shape in plan view, and is provided with: a louver layer 10 in which a plurality of light transmission belts 11 and light shielding belts 12 are alternately provided, and a The first transparent protective layer 20 on the entire surface and the second transparent protective layer 30 on the entire surface of the other side of the louver layer 10. The aforementioned viewing angle control body 1 is provided on the image display surface of the image display body, and is suitable for use as an anti-peeping body.

In the viewing angle control body 1, the second transparent protective layer 30 is disposed on the light incident side (that is, the image display side), and the first transparent protective layer 20 is disposed on the light emitting side.

In this embodiment, the longitudinal direction of the rectangular viewing angle control body 1 is the X direction (the left-right direction of the paper surface in FIG. 1), and the short side direction of the viewing angle control body 1 (the paper surface in the first FIG. 1) (Vertical direction) is the Y direction, and the vertical direction of the surface of the viewing angle control body 1 is (that is, the thickness direction of the viewing angle control body 1) is the Z direction.

In addition, the rectangle in the present embodiment may be formed as a rough outline. For example, at least one of the four right angles of the rectangle can be chamfered. In addition, a cutout may be formed at any part of the periphery of the rectangle, or a protruding portion that partially protrudes from the side of the rectangle may be formed. In addition, 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, and more preferably 55% or more. Specifically, it is preferably 45% or more and 100% or less, and more preferably 55% or more and 100% or less. The upper limit of the above-mentioned light transmittance is preferably higher, but in order to ensure sufficient anti-voyeurism, about 80% is the limit.

The value of the light transmittance in this specification is set as follows: In an apparatus that uses D65 specified in JIS Z 8720 as a light source and uses a light-receiving sensor to measure the intensity of the inspection light emitted from the light source, The output value of the light-receiving sensor in a state where there is no object to be measured on the optical path is A, in a state where the object to be measured is placed on the optical path of the inspection light and the penetrating light penetrating the object to be measured is received by the light-receiving sensor When the output value is B, use the transmittance = (B / A) × 100 (unit:%) to find the value.

The viewing angle control body 1 of this embodiment includes a first end region 1a including one end of the viewing angle control body 1 in the longitudinal direction, and a second end including the other end of the viewing angle control body 1 in the longitudinal direction The partial region 1b and the central region 1c formed between the first end region 1a and the second end region 1b.

As will be described later, in the first end region 1a, the second end region 1b, and the central region 1c, the installation angle of the light-shielding band 12 constituting the louver layer 10 is different. As disclosed in this embodiment, the first end region 1a, the second end region 1b, and the central region 1c are preferably each quadrangular in plan view.

The width W _{c of the} central region 1 _c varies depending on the object of use of the viewing angle control body 1, but in many of the objects of use, the total length with respect to the longitudinal direction of the viewing angle control body 1 is 20% or more and 80% or less Preferably, more than 30% and less than 60% are better. If the width W _{c of the} central region 1c is within the aforementioned range, the viewing angle control body 1 of the present embodiment is very suitable as an anti-peeping body, and the image displayed in the end region of the image display body display surface can be further improved Recognition.

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, and 20% or more and 35% of the total length of the viewing angle control body 1 in the longitudinal direction. The following is better.

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 1 a and the second end region 1 _{b are the} same, the width of the first end region 1 a or the second end region 1 b is relative to the longitudinal direction of the viewing angle control body 1 The ratio (%) of the total length can be obtained from the formula (100-the ratio (%) of the width W _c of the central region 1c) / 2.

Here, the term length of each region in each region of width _{W a, W b, W c} , view angle control means in the longitudinal direction of the body 1.

In addition, in this embodiment, the installation angle system of the light-shielding belt 12 gradually changes, and it is not easy to distinguish the regions. Therefore, for example, the length of the longitudinal direction of the viewing angle control body 1 in the region near the center may also be set 80% of the area is set as the central area 1c, and among the other areas, the area of 10% of the length of the longitudinal direction of the viewing angle control body 1 is set as the first end area 1a, and the length of the viewing angle control body 1 A region of 10% of the length in the lateral direction is used as the second end region 1b or the like to appropriately determine the width of the region.

In addition, in this specification, the fine "length", "thickness", and "width" are values obtained by measuring the length, thickness, or width of an arbitrary ten parts with a measuring microscope, and then averaging the measured values.

The length of the longitudinal direction of the viewing angle control body 1 is not limited, and may be, 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 with a large display surface. Therefore, the length of the longitudinal direction of the viewing angle control body 1 is, for example, 250 mm or more, which is useful, and 300 mm or more. Practically, the length of the longitudinal direction of the viewing angle control body 1 is preferably 600 mm or less, and more preferably 500 mm or less. Specifically, the length of the longitudinal direction of the viewing angle control body 1 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 short-side direction of the viewing angle control body 1 is preferably 50 mm or more, more preferably 150 mm or more, and particularly preferably 175 mm or more. On the other hand, practically, the length of the short-side direction of the viewing angle control body 1 is preferably 1000 mm or less, more preferably 500 mm or less, and particularly preferably 300 mm or less. Specifically, the length of the short-side direction of the viewing angle control body 1 is preferably 50 mm or more and 1000 mm or less, more preferably 150 mm or more and 500 mm or less, and particularly preferably 175 mm or more and 300 mm or less.

(Louver layer)

The louver layer 10 includes a plurality of linear light-transmitting belts 11 and linear light-shielding belts 12, and the light-transmitting belts 11 and the light-shielding belts 12 are alternately and repeatedly arranged. In this embodiment, the light-transmitting belt 11 and the light-shielding belt 12 are formed along the Y direction.

In this embodiment, the width of each light-transmitting belt 11 and the width of each light-shielding belt 12 are fixed in the longitudinal direction. The term "fixed" here also includes the design value of the width within ± 5%. Moreover, all the light-transmitting belts 11 have the same width, and all the light-shielding belts 12 have the same width. However, the "same" width in the present invention allows some differences. In the light-transmitting belt 11, the range within ± 10% relative to the width of the light-transmitting belt 11 located at the center is also included in the "same". The range within ± 10% is also included in "same". The “width” refers to the length in the X direction of the light-transmitting tape 11 or the light-shielding tape 12 on the surface of the louver layer 10 on the light exit side.

In the louver layer 10, the average value of the width of the plurality of light-transmitting bands 11 is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less from the viewpoint of simultaneously achieving anti-peeping and the visibility of the display screen. For the same reason, the average value of the width of the plurality of light-shielding tapes 12 is preferably 1 μm or more and 50 μm or less, and more preferably 10 μm or more and 30 μm or less.

The width of each of the plurality of light-transmitting tapes 11 is preferably 50 μm or more and 200 μm or less, and more preferably 100 μm or more and 150 μm or less. For the same reason, the width of each of the plurality of light-shielding tapes 12 is preferably 1 μm or more and 50 μm or less, and more preferably 10 μm or more and 30 μm or less.

In this embodiment, the thickness of the louver layer 10 is fixed. The so-called "fixed" here also includes the range of the design value of thickness within ± 5%. The “thickness” refers to the length of the louver layer 10 in the Z direction. The thickness of the louver layer 10 can be determined by measuring on the cross-sectional photograph of the single body of the viewing angle control body 1 or the louver layer 10, and is the average of the values obtained by measuring ten parts.

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 particularly preferably 150 μm or more and 500 μm or less.

If the thickness of the louver layer 10 is within the aforementioned range, the viewing angle can be easily adjusted and can be easily manufactured.

In the louver layer 10 of the present embodiment, the light shielding belt 12 is set so that the installation angle gradually increases from the center to the end of the longitudinal direction (X direction) of the viewing angle control body 1. Therefore, in each of the first end region 1a, the second end region 1b, and the central region 1c, the installation angle of the light shielding belt 12 is not fixed, but gradually changes. Here, the installation angle refers to the acute angle between the vertical direction (Z direction) of the surface of the viewing angle control body 1 and the center line drawn by the light shielding belt 12 from the light entrance side to the light exit side ( However, within the range of 0 ° or more and less than 90 °). When the shape of the shading belt 12 viewed from the Y direction is a quadrangle, the center line drawn by the shading belt 12 in the direction from the light entrance side to the light exit side represents the midpoint passing through the upper side and the lower midpoint line.

At least a part of the plurality of light-shielding belts 12 provided in the first end region 1a and at least a part of the plurality of light-shielding belts 12 provided in the second end region 1b are light emitting sides of the light-shielding belt toward the center The area is inclined. In the first end region 1a, the proportion of the light-shielding band inclined toward the central region side of the light-emitting zone is preferably 90-100% relative to the total number of the plurality of light-shielding bands 12 provided in the first end region 1a. 95 to 100% is better. In the second end region 1b, the proportion of the light-shielding band inclined toward the central region is preferably 90-100% relative to the total number of the plurality of light-shielding bands 12 provided in the second end region 1b. 95 to 100% is better. In addition, the average of the installation angles of the plurality of light-shielding belts 12 provided in the first end region 1a and the average of the installation angles of the plurality of light-shielding belts 12 provided in the second end region 1b is proportional to that provided in the central region The average of the installation angles of the plurality of light-shielding bands 12 in 1c is large.

In this embodiment, the light shielding tape 12 provided in the first end region 1a and the light shielding tape 12 provided in the second end region 1b are opposite to each other in the form that the light exit side is closer to the central region 1c than the light entrance side The surface of the viewing angle control body 1 is inclined. Moreover, the installation angle of the light shielding belt 12 provided in the first end region 1a and the second end region 1b is larger than the installation angle of each of the light shielding belts 12 provided in the central region 1c.

In addition, FIG. 1 is a schematic view of the viewing angle control body of this aspect, describing a few light-transmitting belts 11 and light-shielding belts 12, and the light-shielding belts 12 provided in the first end region 1a and the second end region 1b The setting angle of is displayed larger.

The average of the installation angles of the plurality of light-shielding belts 12 provided in the first end region 1a and the average of the installation angles of the plurality of light-shielding belts 12 provided in the second end region 1b is not less than 0 ° and is not full 90 ° is better, more than 1 ° and less than 20 °. If the average of the installation angles of the plurality of light-shielding belts 12 provided in the first end region 1a and the average of the installation angles of the plurality of light-shielding belts 12 provided in the second end region 1b is The field of view of the first end region 1a and the second end region 1b can be concentrated to the user side, and the anti-peeping property will be higher. If it is below the above upper limit, the first end region 1a and It becomes easy to form the light-transmitting tape 11 and the light-shielding tape 12 in the second end region 1b.

The average value of the installation angles of the plurality of light shielding belts 12 in the first end region 1a and the average value of the installation angles of the plurality of light shielding belts 12 in the second end region 1b may be the same or different.

It is preferable that the average value of the installation angles of the plurality of light-shielding strips 12 provided in the central region 1c is 0 ° or more and less than 4 °. If the average value of the installation angles of the plurality of light-shielding strips 12 provided in the central region 1c is less than the above upper limit value, the anti-peeping property will become higher. As described above, in this aspect, the average of the installation angles of the plurality of light-shielding strips 12 provided in the first end region 1a and the average of the installation angles of the plurality of light-shielding strips 12 provided in the second end region 1b, It is larger than the average value of the installation angles of the plurality of light-shielding strips 12 provided in the central region 1c. For example, in the case where the average value of the plurality of shading bands 12 provided in the central region 1c is 2 °, the average value and the setting of the plurality of shading bands 12 provided in the first end region 1a The average value of the installation angles of the plurality of light-shielding strips 12 in the second end region 1b is an angle greater than 2 °.

The difference between the average value of the installation angle in the first end region 1a and the average value of the installation angle in the second end region 1b, and the average value of the installation angle in the second end region 1b and that in the central region 1c The difference between the average values of the setting angles is preferably greater than 0 ° and less than 7.5 °, more preferably 1 ° or more and 5 ° or less, and particularly preferably 1 ° or more and 2.5 ° or less. The larger the average value of the installation angle of the light shielding belt 12, the lower the light transmittance. Therefore, when the difference in the installation angle is large, the difference in light transmittance between the regions adjacent to each other becomes large, and a noticeable difference in light and shade is visually seen, which impairs the appearance of the viewing angle control body 1. If the difference in the average value of the set angles is below the upper limit, the difference in light transmittance between adjacent areas becomes smaller, and the difference in visual density becomes smaller.

The installation angle of the shading tape 12 can be performed on the cross-sectional photo of the single body of the viewing angle control body 1 or the louver layer 10 using a digital protractor based on the surface of the light exit side of the louver layer 10 as a reference It is measured as the acute angle between the center line of the light shielding tape 12 drawn from the light entrance side to the light exit side and the vertical direction of the surface of the viewing angle control body 1.

The average value of the installation angles of the plurality of light-shielding belts 12 is the value obtained by averaging the installation angles of the plurality of light-shielding belts 12 using the above-described measurement method of the installation angle.

The installation angles of the plurality of light-shielding strips 12 provided in the first end region 1a and the plurality of light-shielding strips 12 provided in the second end region 1b are preferably 1 ° or more and 20 ° or less. If the installation angles of the plurality of light-shielding belts 12 provided in the first end region 1a and the plurality of light-shielding belts 12 provided in the second end region 1b are each above the lower limit, the first end The field of view of the partial region 1a and the second end region 1b is concentrated toward the user side, and the anti-peeping property will be higher. If it is below the aforementioned upper limit, the first end region 1a and the second end region 1b It becomes easy to form the light-transmitting belt 11 and the light-shielding belt 12.

It is preferable that the installation angles of the plurality of light-shielding strips 12 provided in the central region 1c are each 0 ° or more and less than 4 °. If the installation angles of the plurality of light-shielding strips 12 provided in the central region 1c are less than the upper limit, the anti-peeping property will be even higher. As described above, in this aspect, the installation angle of each of the plurality of shading strips 12 provided in the first end region 1a and the installation angle of each of the plurality of shading strips 12 provided in the second end region 1b are compared Each of the plurality of light-shielding strips 12 provided in the central region 1c has a large installation angle. For example, in the case where the installation angles of the plurality of light-shielding belts 12 provided in the central region 1c are each 2 °, the installation angles of the plurality of light-shielding belts 12 in the first end region 1a and the second end region 1b are each It becomes an angle larger than 2 °.

[Translucent tape]

As the material constituting the light-transmitting belt 11, a resin material that can transmit the wavelength of the visible light of the target can be used. The wavelength of the light penetrating the light transmission band 11 may be the entire range of visible light from 380 nm to 830 nm, or a part of it.

As the resin material constituting the light-transmitting belt 11, a thermoplastic resin or a thermosetting resin with high transparency can be used, and examples thereof include cellulose resins, polyolefin resins, polyester resins, silicone resins, and polystyrene resins. , PVC resin, acrylic resin, polycarbonate resin, etc. Among them, silicone resin is preferred, and silicone rubber is preferred in terms of high flexibility, heat resistance, and transparency.

Silicone rubber, for example, can be exemplified by a silicone rubber composition composed of two organic polysiloxanes and organic peroxides whose molecular chain ends are terminated with a hydroxysilyl group or a vinyl silicon group, and is generally called a compound rubber. ; In a molecule of at least two vinyl polyorganosiloxanes having at least two silicon atoms bonded to silicon atoms, blended with at least three hydrogen atoms (ie SiH bonds) bonded to silicon atoms in the molecule The so-called addition reaction type organic silicone rubber composition of organic hydrogen polysiloxane and platinum-based catalyst, etc.

The light transmittance band 11 is preferably such that the light transmittance of the light along the Z direction when entering the light transmittance band 11 is more than 75%, 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.

[Blackout]

As the material constituting the light-shielding belt 12, a coloring resin which uses the resin material constituting the light-transmitting belt 11 as a base material and adds colorants such as pigments and dyes thereto.

The resin material contained in the light-shielding tape 12 can be the same as the resin material contained in the light-transmitting tape 11. The resin material contained in the light-shielding belt 12 may be the same as or different from the resin material contained in the light-transmitting belt 11. From the viewpoint of increasing the adhesion between the light-transmitting belt 11 and the light-shielding belt 12, the resin material contained in the light-shielding belt 12 is preferably the same as the resin material contained in the light-transmitting belt 11.

The color tone of the light-shielding belt 12 may be good as long as the light-shielding belt 12 can obtain a good light-shielding property, and may be black, red, yellow, green, blue, aqua blue, or the like. The color tone of the light-shielding belt 12 can be adjusted by the type and addition amount of the colorant.

The color tone of the light-shielding belt 12 constitutes the color tone seen when viewing the louver layer 10, so it is preferably designed in consideration of the appearance of the viewing angle control body 1 as well.

The light transmittance of the light shielding belt 12 when light enters the light shielding belt 12 along the X direction is preferably 40% or less, and more preferably 10% or less. Specifically, it is preferably 0% or more and 40% or less, and more preferably 0% or more and 10% or less. If such a light transmittance, it will have sufficient light-shielding properties.

Specific examples of the coloring agent contained in the shading tape 12 include carbon black, iron oxide, titanium oxide, yellow iron oxide, disazo yellow, and phthalocyanine blue. Organic pigments or inorganic pigments. One kind of colorant may be used alone, or two or more kinds may be used in combination.

When a black pigment is not used as a coloring agent, in order to ensure light-shielding property, it is preferable to use a white pigment in combination.

(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, and are provided on the surface of the louver layer 10 on the light exit side and function as a protective layer of the louver layer 10.

The light transmittance of the first transparent protective layer 20 and the second transparent protective layer 30 when light enters along the Z direction is preferably at least 75%, and more preferably at least 85%. 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 constituting the first transparent protective layer 20 and the second transparent protective layer 30 include, for example, polycarbonate resin, polyester resin, acrylic resin, polyolefin resin (especially cycloolefin polymer) , Cellulose resin, etc. Among these transparent resin materials, polycarbonate resin or polyester resin is preferable from the viewpoint of higher transparency and heat resistance.

One type of transparent resin material may be used alone, or two or more types may be used in combination.

The thicknesses of the first transparent protective layer 20 and the second transparent protective layer 30 are 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 thicknesses of the first transparent protective layer 20 and the second transparent protective layer 30 are above the aforementioned lower limit, the louver layer 10 can be sufficiently protected, and if they are below the aforementioned upper limit, sufficient light transmittance can be ensured.

The first transparent protective layer 20 and the second transparent protective layer 30 may be the same or different.

(Manufacturing method of viewing angle control body)

The viewing angle control body 1 of this embodiment can be manufactured by a method having a louver layer forming step, a first transparent protective layer laminating step, and a second transparent protective layer laminating step. Among them, the louver layer forming step includes a laminate forming step, a bulk forming step, and a cutting step.

[Layer formation step]

The step of forming a laminate is a step of alternately laminating a plurality of sheets for light-transmitting tape and a plurality of sheets for light-shielding tape to form a laminate.

The sheet for the light-transmitting belt can be manufactured by forming the resin material constituting the light-transmitting belt 11 into a sheet shape. The sheet for shading tape can be manufactured by forming the resin material constituting the shading tape 12 into a sheet shape. The sheet for the light-transmitting belt and the sheet for the light-shielding belt are each formed to have a fixed thickness. The molding method for forming the resin material into a sheet shape may be, for example, extrusion molding, calendar molding, press molding, and the like.

In the formation of the layered body, a plurality of sheets for the light-transmitting belt and a plurality of sheets for the light-shielding belt can be sequentially laminated alternately one at a time to form a layered body, or a plurality of alternately laminated plural light-transmitting belts can be prepared in advance The lamination unit made of a sheet and a plurality of sheets for shading tapes is then laminated with these lamination units to form a laminate.

In addition, the sheet for light-transmitting tapes and the sheet for light-shielding tapes can be adhered using an adhesive.

[Block formation step]

The block forming step is a step of pressing the aforementioned laminate to form a block.

For the pressurization of the laminate, for example, a roll or a press can be used. When pressurizing, in order to improve the adhesion of the sheets, heating is preferred. The heating temperature can be appropriately selected according to the material used. When the heating temperature is too high, the uniformity of the thickness of the sheet is impaired, and when the heating temperature is too low, the adhesive force between the sheets may sometimes become weak.

[Cutting procedure]

The cutting step is a cutting step of cutting the block in such a manner that the cutting angle is greater than 0 ° and less than 90 °. Here, the so-called cutting angle is the acute angle between the thickness direction of the block and the tangent plane at any point of the cutting surface of each cutting area (however, it is between 0 ° and less than 90 ° Within range). That is, the so-called cutting angle system is: the intersection of the line L and the vertical line when the vertical line is drawn from the line L drawn in the thickness direction of the block to the tangent plane, the intersection point of the line L and the tangent plane The intersection of the perpendicular and the aforementioned tangent plane is the acute angle between the line L on the triangle at the vertex and the aforementioned tangent plane. The so-called arbitrary point may be any point on the cutting plane of the cutting region, and may be a point other than the center point. The thickness of the block refers to the direction in which the plurality of sheets for the light-transmitting belt and the plurality of sheets for the light-shielding belt constituting the block are laminated. The cutting angle can be measured with a digital scale according to each cutting area.

As shown in FIG. 2, the cutting step in this embodiment cuts the block 100 to form a sheet-shaped louver layer 10 by forming a cut surface with a curved surface whose cut angle gradually changes. At this time, the block 100 is cut so that the cutting angle is 0 ° or more and 20 ° or less.

If the cutting angle is 20 ° or less, the obtained louver layer 10 can be sufficiently secured against peeping. In addition, in this embodiment, the block 100 is sliced so that the thickness of the louver layer 10 becomes constant.

The cutting method may be, for example, one of the blocks 100 that exposes the curved cutting edge that cuts the desired curved cut surface from both the light-transmitting tape sheet 110 and the light-shielding tape sheet 120 The method of cutting the surface and cutting the sheet 110 for the light-transmitting tape and the sheet 120 for the light-shielding tape at the same time.

In addition, as another cutting method, it is also possible to cut the cutting blade from one surface of the block 100 exposed only by the sheet 110 for light-transmitting tape or only the sheet 120 for light-shielding tape, and the cut surface becomes a curved surface The method of moving the cutting blade or block 100 and cutting the sheet 110 for the light-transmitting tape and the sheet 120 for the light-shielding tape alternately.

According to the present embodiment, the louver layer 10 obtained by cutting the block 100 so that the cut surface becomes a curved surface is a curved sheet, but the sheet is made of resin and is thin, so it has high flexibility. Therefore, when the obtained curved sheet is placed on a flat surface, it will be flat along the flat surface.

In the present embodiment, when the cut curved sheet is made flat, it becomes a sheet in which the light shielding tape is inclined and the inclination of the light shielding tape gradually increases from the center to the end. Therefore, as described above, when the cutting surface is curved, the first cutting region 101a and the second cutting region 101b with a large cutting angle can be formed, and the cutting angle is more than the first cutting region enclosed by these regions The third cutting region 101c having the smaller cutting angle of the cutting region 101a and the second cutting region 101b. The first cut region 101a is a region corresponding to the above-mentioned first end region 1a, the second cut region 101b is a region corresponding to the above-mentioned second end region 1b, and the third cut region 101c is the above-mentioned region The area corresponding to the central area 1c. Therefore, the louver layer 10 of this embodiment can be obtained by the above-mentioned cutting step.

In the aforementioned cutting step, it is preferable to change the cutting angle of the first cutting region 101a and the second cutting region 101b within a range of 1 ° or more and 20 ° or less and to make the cutting angle of 101c more than 0 ° And change within the range of less than 4 °. If the cutting angle of each cutting region is within the aforementioned range, the installation angle of the light-shielding tape can be easily adjusted to the target angle. In particular, if the cutting angle of the first cutting region 101a and the second cutting region 101b is equal to or greater than the aforementioned lower limit, the visual field of the first end region 1a and the second end region 1b can be made visible to the user Side concentration increases the anti-peeping property, and if it is below the upper limit, it becomes easier to form the light-transmitting tape 11 and the light-shielding tape 12 in the first end region 1a and the second end region 1b.

The curved cutting surface formed by the cutting step is preferably a cylindrical side surface.

As in this embodiment, when the block 100 is cut so that the cut surface becomes a curved surface, the curvature radius of the curved surface is preferably 200 mm or more and 2000 mm or less, and more preferably 500 mm or more and 1700 mm or less. If the curved surface has such a radius of curvature, the cutting angle can be easily adjusted to the aforementioned preferred range, and the target louver layer 10 can be easily obtained. Specifically, if the radius of curvature of the curved surface is greater than or equal to the aforementioned lower limit, the visibility of the image in the first end region and the second end region can be sufficiently ensured, and if it is less than or equal to the aforementioned upper limit, Fully ensure anti-voyeurism.

[Step of laminating the first transparent protective layer]

The first transparent protective layer stacking step is a step of layering the first transparent protective layer on the area of the light exit side of the louver layer obtained by the cutting step.

The method of laminating the first transparent protective layer may be, for example, a method of forming the first transparent protective layer into a sheet in advance, and then sticking the obtained transparent sheet to the side surface of the louver layer. Adhesives can be used during the adhesion of transparent sheets, or they can be thermocompression-bonded without using adhesives.

When using an adhesive, it is preferable to use a hardened one having a high light transmittance as the adhesive. Specifically, the light transmittance of the adhesive layer monomer after curing is preferably 65% or more, and more preferably 80% or more. 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 epoxy-based adhesives, urethane-based adhesives, acrylic-based adhesives, melamine-based adhesives, polyester-based adhesives, and silicone-based adhesives. Furthermore, the adhesive may be any of a thermosetting adhesive, a multi-liquid reaction adhesive, an ultraviolet curing adhesive, and the like.

[Second transparent protective layer stacking step]

The second transparent protective layer stacking step is a step of layering the second transparent protective layer on the area of the light entrance side of the louver layer obtained by the cutting step.

The method of laminating the second transparent protective layer on the louver layer is the same as the method of laminating the first transparent protective layer on the louver layer.

(Angle of view control image display)

The angle-of-view control image display system of this embodiment includes an image display, and the above-mentioned angle-of-view control body provided on the image display surface of the image display. It is preferable that the size and shape of the viewing angle control body correspond to the size and shape of the display surface of the image display body.

Examples of the image display body include image display devices that display image signals, such as liquid crystal display devices or organic electroluminescence display devices. In general, the display surface (screen) of the image display device is a rectangle whose left-right direction relative to the user is the long-side direction. Therefore, the viewing angle control system of the present embodiment of the rectangle is arranged such that its long-side direction is along the long-side direction of the display surface of the image display device.

The image display body may also be a printed matter printed on paper or plastic sheet. The shape of the printed matter is not particularly limited, but the viewing angle control body of this embodiment is suitable for the case of a rectangular printed matter.

When the display surface of the image display body is rectangular, it is useful when the length in the longitudinal direction is 250 mm or more, and particularly useful when it is 300 mm or more. Practically, the length of the display surface of the image display in the longitudinal direction is preferably 600 mm or less, and more preferably 500 mm or less. Specifically, the length of the display surface of the image display 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 short-side direction of the display surface of the image display is preferably 50 mm or more, more preferably 150 mm or more, and particularly preferably 175 mm or more. On the other hand, in practice, the length of the display surface of the image display in the short-side direction is preferably 1000 mm or less, more preferably 500 mm or less, and particularly preferably 300 mm or less. Specifically, the length of the short-side direction of the display surface of the image display is preferably 50 mm or more and 1000 mm or less, more preferably 150 mm or more and 500 mm or less, and particularly preferably 175 mm or more and 300 mm or less.

The viewing angle control body of this embodiment is particularly suitable for use in an information input and output device equipped with a touch sensor in an image display device. This is because the information input and output machines display and input secret information in many cases, and most of them require anti-peeping.

The central area of the viewing angle control body of the present embodiment is controlled so that the viewing angle becomes smaller, so that it is highly anti-peeping. Therefore, the central area of the viewing angle control body preferably overlaps the area where the hidden information is displayed.

The width of the area where the hidden 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 width of the image display body in the width direction.

The width of the area where the hidden information is displayed is preferably 10% or more and 100% or less, and more preferably 10% or more and 90% or less, relative to the width of the central area of the viewing angle control body.

In information input / output devices, most of the hidden information is usually displayed near the center of the display surface of the image display body. Therefore, when the viewing angle control body of this embodiment is provided on the display surface of the image display body, the central area of the viewing angle control body can be easily superimposed on the display of the hidden information, which can prevent the hidden information from being peeped.

When the conventional viewing angle control body is provided on the display surface of the image display body, for users located in the front of the central area, the image displayed on the end area of the longitudinal direction of the display surface may not enter To the angle of view controlled by the louver layer. Therefore, it is difficult for the user located in the front of the central area to recognize the image displayed on the end area of the display surface. However, in the viewing angle control body of the present embodiment, the light shielding bands of the first end region and the second end region are inclined toward the center region side, and the light emission direction is adjusted to face the user side. Therefore, when the user located in the front of the central area views the image displayed on the end area of the display surface, it is easy to recognize because the image enters the angle of view range formed by the angle of view control. At the same time, since the first end region and the second end region are also controlled so that the angle of view becomes smaller, voyeurism is ensured.

In particular, the viewing angle control system of the present embodiment gradually increases the installation angle of the light-shielding tape from the center to the end in the longitudinal direction, so it is easier to direct the light exit direction of all the light-transmitting tapes toward the user. Therefore, it is easier to make both the anti-peeping property and the visibility of the image displayed in the end region simultaneously.

    <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 this embodiment. The viewing angle control body 2 of this embodiment is the same as the first embodiment except that the shape of the louver layer is different.

That is, the louver layer 40 used in the present embodiment makes the installation angles of the plurality of shading strips 12 provided in the first end region 2a, and the installation angles of the plurality of shading strips 12 provided in the second end region 2b, The installation angles of the plurality of light-shielding strips 12 provided in the central area 2c are fixed in each area.

The installation angle of the shading belt 12 provided in the first end region 2a and the second end region 2b is larger than that of the shading belt 12 provided in the central region 2c, which is the same as the louver layer 10 in the first embodiment same. The installation angle in the first end region 2a and the installation angle in the second end region 2b may be the same or different.

The thickness of the louver layer 40 in this embodiment, the width of the light-transmitting belt 11, the material constituting the light-transmitting belt 11, the installation angle of the light-shielding belt 12, the width of the light-shielding belt 12, and the material constituting the light-shielding belt 12 are all the same as the first The louver layer 10 in the embodiment is the same.

The first manufacturing example for manufacturing the viewing angle control body 2 of this embodiment will be described.

The first manufacturing example of manufacturing the viewing angle control body 2 is the same as that of the first embodiment except that the cutting step is different.

That is, as shown in FIG. 4, the cutting step in this manufacturing example is divided into a first cutting area 102a, a second cutting area 102b, and a third cutting area 102c each having a fixed cutting angle. The block 100 is cut so that the cut surface becomes concave and three planes are formed to cut out the sheet-shaped louver layer 40.

The first cut region 102a corresponds to the first end region 2a, the second cut region 102b corresponds to the second end region 2b, and the third cut region 102c corresponds to the central region 2c.

In this embodiment, in order to make the installation angle of the shading tape 12 the target angle, it is preferable to set the cutting angle of the first cutting region 102a and the second cutting region 102b to 0 ° or more and 20 ° or less. It is fixed, and the cutting angle of the third cutting region 102c is set to be 0 ° or more and less than 4 ° and fixed. In addition, it is more preferable that the cutting angle of the first cutting region 102a and the second cutting region 102b is fixed at 10 ° or more and 20 ° or less, and the cutting angle of the third cutting region 102c is 0. Above ° and less than 4 ° and make it fixed. If the cutting angles of the first cutting region 102a and the second cutting region 102b are equal to or greater than the aforementioned lower limit, the field of view of the first end region 2a and the second end region 2b can be concentrated on the user side The anti-peeping property will be even higher, and if it is below the aforementioned upper limit, it will be easier to form the light-transmitting belt 11 and the light-shielding belt 12 in the first end region 2a and the second end region 2b.

In addition, in this aspect, even if the cutting angle of each region is within the aforementioned range, the cutting angles of the first cutting region 102a and the second cutting region 102b are also larger than the cutting angle of the third cutting region 102c .

Examples of the cutting method include, for example, a block body 100 that exposes the cutting blade from both the sheet 110 for light-transmitting tape and the sheet 120 for light-shielding tape so as to obtain a desired bent cutting surface A method of cutting a surface of the light and cutting the sheet 110 for the light-transmitting tape and the sheet 120 for the light-shielding tape at the same time.

As for other cutting methods, it is also possible to cut the cutting blade from a surface of the block 100 exposed only with the sheet 110 for light-transmitting tape or only the sheet 120 for light-shielding tape, and the desired bending will be obtained The method of cutting the surface allows the cutting blade or block 100 to move, and alternately cuts the sheet 110 for light-transmitting tape and the sheet 120 for light-shielding tape.

In the first manufacturing example, the louver layer obtained by cutting the block 100 in such a way that the cut surface becomes three curved planes is a bent sheet, but the sheet is made of resin and is thin, so High flexibility. Therefore, when the obtained sheet is placed on a flat surface, it will lay flat along the flat surface.

In a flat sheet, as described above, the first cut region 102a corresponds to the first end region 2a, the second cut region 102b corresponds to the second end region 2b, and the third cut region 102c This corresponds to the above-mentioned central area 2c. Therefore, the louver layer 40 of this embodiment is obtained by the above-mentioned cutting step.

A second manufacturing example of manufacturing the viewing angle control body 2 of this embodiment will be described.

The second manufacturing example of manufacturing the viewing angle control body 2 is a method having a laminating unit forming step, a laminating body forming step, a block forming step, a cutting step, a first transparent protective layer laminating step, and a second transparent protective layer laminating step. The block forming step, the first transparent protective layer stacking step and the second transparent protective layer stacking step in this example are the same as the block forming step and the first transparent protection in the manufacturing method of the viewing angle control body 1 of the first embodiment The lamination step is the same as the second transparent protective lamination step.

The step of forming a lamination unit is to form a laminated body for producing a laminated unit formed by alternately laminating a plurality of sheets for a light-transmitting belt and a sheet for a light-shielding belt, and pressurize the laminated body for producing a laminated unit to form a block for producing a laminated unit The step of making a build-up unit by cutting the block for making a build-up unit in such a way that the installation angle of the light-shielding band becomes the target angle.

The lamination of the sheet for the light-transmitting tape and the sheet for the light-shielding tape when producing the laminate for the production of the laminate unit is the same as the procedure for forming the laminate in the manufacturing method of the first embodiment.

The method of pressing the layered body for manufacturing the layered unit is the same as the step of forming the block in the first embodiment.

The cutting of the block for producing a build-up unit is to adjust the angle of the cut and the like to produce the first build-up unit, the second build-up unit, and the third build-up unit.

In the production of the first layering unit, a unit is formed in which a plurality of layers of sheets for light-transmitting tape and sheets for light-shielding tape are laminated at an angle corresponding to the installation angle of the light-shielding tape in the first end region 2a, The block for making a build-up unit is cut.

In the production of the second layering unit, a unit is formed in which a plurality of layers of sheets for light-transmitting tape and sheets for light-shielding tape are laminated at an angle corresponding to the installation angle of the light-shielding tape in the second end region 2b, The block for making a build-up unit is cut.

In the production of the third build-up unit, the build-up unit is formed in such a way that a unit in which a plurality of layers of sheets for light-transmitting tape and sheets for light-shielding tape are stacked at an angle corresponding to the installation angle of the light-shielding tape in the central region 2c The production block is cut.

The layered body forming step in this example is a step of forming the layered body by stacking the first layered unit, the second layered unit, and the third layered unit obtained by the layered unit forming step.

In the foregoing steps, each stacking unit is stacked in such a manner that the third stacking unit is disposed between the first stacking unit and the second stacking unit.

The cutting step in this example is a step of cutting the block obtained by the block forming step to obtain a louver layer.

Examples of the cutting method in the cutting step include, for example, cutting the cutting blade from a surface of the block that exposes both the sheet for light-transmitting tape and the sheet for light-shielding tape so as to be perpendicular to the aforementioned surface At the same time, the method of cutting the sheet 110 for light-transmitting tape and the sheet 120 for light-shielding tape at the same time.

In addition, as for another cutting method, it is also possible to cut the cutting blade perpendicularly from a surface of the block body exposed only by the sheet for light-transmitting tape or the sheet for light-shielding tape, and make the cutting blade or block A method of moving and cutting the sheet for the light-transmitting belt and the sheet for the light-shielding belt alternately.

The use form of the viewing angle control body of this 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 ensure peep prevention. In addition, in the present embodiment, the shading bands in the first end region and the second end region are also inclined toward the center region, so that the light emission direction is adjusted to face the user. Therefore, when the user located in the front of the central area views the image displayed on the end area of the display surface, it is easy to recognize because the image enters the angle of view range controlled by the angle of view.

    <Third Embodiment>    

The viewing angle control body of the third embodiment of the present invention will be described.

Fig. 5 shows the viewing angle control body of this embodiment. The viewing angle control body 3 of this embodiment is the same as the first embodiment except that the shape of the louver layer is different.

That is, the louver layer 50 used in this embodiment has the first end region 3a, the second end region 3b, and the central region 3c in addition to the first end region 3a and the central region 3c. An intermediate region 3d, and a second intermediate region 3e between the second end region 3b and the central region 3c.

The average value of the plurality of light-shielding strips 12 provided in the first middle region 3d is smaller than the average value of the plurality of light-shielding strips 12 provided in the first end region 3a, and it is smaller than the average value The average of the installation angles of the plurality of light-shielding bands 12 in 3c is large. The average setting angle of the plurality of light-shielding strips 12 provided in the second middle region 3e is smaller than the average value of the installation angle of the plurality of light-shielding strips 12 provided in the second end region 3b, and is smaller than that provided in the central region The average of the installation angles of the plurality of light-shielding bands 12 in 3c is large.

In this embodiment, the installation angle of each of the plurality of light-shielding belts 12 provided in the first intermediate region 3d is smaller than the installation angle of each of the plurality of light-shielding belts 12 provided in the first end region 3a, and is smaller than Each of the plurality of light-shielding strips 12 provided in the central region 3c has a large installation angle. The installation angle of each of the plurality of light-shielding belts 12 provided in the second middle region 3e is smaller than the installation angle of each of the plurality of light-shielding belts 12 provided in the second end region 3b, and is smaller than the installation angle of each of the plurality of light-shielding belts 12 provided in the second end region 3b Each of the plurality of light-shielding strips 12 has a large installation angle.

In this embodiment, the installation angles of the plurality of light shielding belts 12 provided in the first end region 3a, the installation angles of the plurality of light shielding belts 12 provided in the second end region 3b, and the plurality of installation angles provided in the central region 3c The installation angle of the shading belt 12, the installation angle of the plurality of shading belts 12 provided in the first intermediate region 3d, and the installation angle of the plurality of shading belts 12 provided in the second intermediate region 3e are each fixed in each region. The arrangement angle of the plurality of light-shielding belts 12 provided in the first end region 3a and the second end region 3b is larger than the installation angle of the plurality of light-shielding belts 12 provided in the central region 3c is the same as in the first embodiment The louver layer 10 is the same.

The thickness of the louver layer 50 in this embodiment, the width of the light-transmitting belt 11, the material constituting the light-transmitting belt 11, the width of the light-shielding belt 12, and the material constituting the light-shielding belt 12 are all the same as those of the louver layer 10 in the first embodiment. same.

The width W _{c of the} central region 3c varies depending on the object of use of the viewing angle control body 3, but in most of the objects of use, the total length of the longitudinal direction of the viewing angle control body 3 is 20% or more and 80% or less Preferably, more than 30% and less than 60% are better. If the width W _{c of the} central region 3c is within the aforementioned range, the viewing angle control body 3 of this embodiment is very suitable as an anti-peeping body, and the image displayed in the end region of the image display body display surface can be further improved Recognition.

The width W _{d of the} first intermediate region 3 _d and the width W _{e of the} second intermediate region 3 _e vary depending on the object of use of the viewing angle control body 3, but in many objects of use, the The total length in the longitudinal direction is preferably 5% or more and 20% or less, and more preferably 10% or more and 17.5% or less. A first intermediate region of the width W _d 3d and 3e of the second intermediate zone, if the width W _e in the above lower limit, it is possible to reduce the difference in light transmittance between the adjacent contact region, may reduce visually The difference between shades. If the width W _{d of the} first intermediate region 3 _d and the width W _{e of the} second intermediate region 3 _{e are} below the above upper limit value, sufficient protection against peeping and visibility of the image displayed in the end region can be sufficiently ensured.

The width W _{a of the} first end region 3 _a and the width W _{b of the} second end region 3 _b are preferably 5% or more and 20% or less, and 10% or more and 17.5% of the total length of the viewing angle control body 3 in the longitudinal direction. The following is better.

First end region 3a and the width W _a second end region 3b of the width W _b may be the same or different, but usually the same system. A first intermediate region of the width W _d 3d and 3e of the second intermediate zone width W _e can be the same or different, but usually the same system.

The first end region and the second end region 3a 3b width W _a, W _b of the same case, the first end region 3a or the second end region 3b with respect to the width of the longitudinal direction of the viewing angle control body 3 the full-length ratio (%), from the ratio (3c central region 100 of the width W _c (%) - the ratio of the first intermediate zone width W _d of 3d (%) - the second intermediate zone width W _e 3e The ratio of (%)) / 2 is calculated.

Here, the term width of each region _{W a, W b, W c} , W d, W e, the viewing angle means the length of each region of the longitudinal direction of the body 3 is controlled.

The average of the installation angles of the plurality of light-shielding strips 12 provided in the first end region 3a and the average of the installation angles of the plurality of light-shielding strips 12 provided in the second end region 3b is preferably 10 ° or more and 20 ° or less . If the average of the installation angles of the plurality of light-shielding belts 12 provided in the first end region 3a and the average of the installation angles of the plurality of light-shielding belts 12 provided in the second end region 3b is The field of view of the first end region 3a and the second end region 3b can be concentrated to the user side, and the anti-peeping property will be higher. If the upper limit value is below the upper limit value, the first end region 3a and the second It becomes easy to form the light-transmitting belt 11 and the light-shielding belt 12 in the end region 3b.

The average value of the installation angles of the plurality of light-shielding belts 12 provided in the first intermediate region 3d and the average value of the installation angles of the plurality of light-shielding belts 12 provided in the second intermediate region 3e is preferably 1 ° or more and less than 10 ° . If the average of the installation angles of the plurality of light-shielding strips 12 provided in the first intermediate region 3d and the second intermediate region 3e is above the lower limit, the field of view of the first intermediate region 3d and the second intermediate region 3e can be obtained Focusing on the user side will increase the anti-peeping property, and if it is below the upper limit, it will be easier to form the light-transmitting belt 11 and the light-shielding belt 12 in the first intermediate region 3d and the second intermediate region 3e.

It is preferable that the average value of the installation angles of the plurality of light-shielding strips 12 provided in the central region 3c is 0 ° or more and less than 4 °. If the average value of the installation angles of the plurality of light-shielding strips 12 provided in the central region 3c is less than the above upper limit value, the anti-peeping property will become higher. As described above, in this aspect, the average of the installation angles of the plurality of light-shielding bands 12 in the first intermediate region 3d and the second intermediate region 3e is equal to the average of the installation angles of the plurality of light-shielding bands 12 in the central region 3c The value is large. For example, when the average setting angle of the plurality of light-shielding strips 12 in the central region 3c is 2 °, the average value of the setting angle of the plurality of light-shielding strips 12 in the first intermediate region 3d and the second intermediate region 3e The angle is larger than 2 °.

The average value of the installation angle in the first end region 3a and the average value of the installation angle in the second end region 3b may be the same or different. The average value of the installation angle in the first intermediate region 3d and the average value of the installation angle in the second intermediate region 3e may be the same or different.

It is preferable that the installation angles of the plurality of light shielding strips 12 provided in the first end region 3a and the second end region 3b are each 10 ° or more and 20 ° or less. If the installation angle of the plurality of light-shielding strips 12 provided in the first end region 3a and the second end region 3b is above the lower limit value, the field of view of the first end region 3a and the second end region 3b can be obtained The range is concentrated toward the user side, and the anti-peeping property will be higher. If it is below the above upper limit, it is easy to form the light-transmitting belt 11 and the light-shielding belt 12 in the first end region 3a and the second end region 3b .

It is preferable that the installation angles of the plurality of light shielding tapes 12 provided in the first intermediate region 3d and the second intermediate region 3e are each 1 ° or more and less than 10 °. If the installation angles of the plurality of light-shielding strips 12 provided in the first intermediate region 3d and the second intermediate region 3e are each above the lower limit value, the field of view of the first intermediate region 3d and the second intermediate region 3e can be used Concentration on the person's side will increase the anti-peeping property, and if it is below the above upper limit, it will be easier to form the light-transmitting belt 11 and the light-shielding belt 12 in the first intermediate region 3d and the second intermediate region 3e.

It is preferable that the installation angles of the plurality of light-shielding strips 12 provided in the central region 3c are each 0 ° or more and less than 4 °. If the installation angles of the plurality of light-shielding strips 12 provided in the central region 3c are less than the above upper limit, the anti-peeping property will become higher. As described above, in this aspect, the installation angle of each of the plurality of light-shielding strips 12 in the first intermediate region 3d and the second intermediate region 3e is larger than the installation angle of each of the plurality of light-shielding strips 12 in the central region 3c . For example, when the installation angles of the plurality of light-shielding strips 12 in the central region 3c are each 2 °, the installation angles of the plurality of light-shielding strips 12 in the first intermediate region 3d and the second intermediate region 3e are each 2 ° Large angle.

The difference between the average value of the installation angle in the first end region 3a and the average value of the installation angle in the first intermediate region 3d, the average value of the installation angle in the first intermediate region 3d and the installation angle in the central region 3c The difference between the average value, the difference between the average value of the setting angle in the second end region 3b and the average value of the setting angle in the second intermediate region 3e, and the average value of the setting angle in the second intermediate region 3e and in the center The difference between the average values of the installation angles of the regions 3c is preferably greater than 0 ° and less than 7.5 °, more preferably 1 ° or more and 5 ° or less, and particularly preferably 1 ° or more and 2.5 ° or less. If the difference between the average values of the set angles is above the lower limit, the visibility of the images in the first end region 3a, the second end region 3b, the first intermediate region 3d, and the second intermediate region 3e will be Become higher. On the other hand, if the difference in the average value of the installation angles is less than the upper limit value, the difference in light transmittance between adjacent regions becomes smaller, and the difference in visual density becomes smaller.

A third manufacturing example of manufacturing the viewing angle control body 3 of this embodiment will be described.

The third manufacturing example of manufacturing the viewing angle control body 3 is the same as that of the first embodiment except for the different cutting steps.

That is, as shown in FIG. 6, the cutting step in this manufacturing example is divided into the first cutting area 103a, the second cutting area 103b, the third cutting area 103c, and the The fourth cut region 103d and the fifth cut region 103e cut the block 100 so that the cut surface is concave and five planes are formed to cut out the sheet-shaped louver layer 50.

The first cut region 103a corresponds to the first end region 3a, the second cut region 103b corresponds to the second end region 3b, the third cut region 103c corresponds to the central region 3c, and the fourth The cut region 103d corresponds to the first intermediate region 3d, and the fifth cut region 103e corresponds to the second intermediate region 3e.

In order to make the installation angle of the shading tape 12 the target angle, it is preferable to make the cutting angles of the first cutting area 103a and the second cutting area 103b within a range of 10 ° or more and 20 ° or less and make them fixed. The cutting angle of the third cutting region 103c is made to be fixed within the range of 0 ° or more and less than 4 °, and the cutting angle of the fourth cutting region 103d and the fifth cutting region 103e is 1 It is fixed within the range above ° and less than 10 °. In particular, if the cutting angles of the first cutting region 103a and the second cutting region 103b are equal to or greater than the aforementioned lower limit, the field of view of the first end region 3a and the second end region 3b can be directed to the user If the sides are concentrated, the anti-peeping property becomes higher. If the upper limit value is not exceeded, it is easy to form the light-transmitting tape 11 and the light-shielding tape 12 in the first end region 3a and the second end region 3b. If the cutting angle of the first intermediate region 3d and the second intermediate region 3e is equal to or greater than the aforementioned lower limit, the field of view of the first intermediate region 3d and the second intermediate region 3e can be concentrated toward the user side, preventing voyeurism It becomes even higher, and if it is below the above upper limit, it becomes easier to form the light-transmitting belt 11 and the light-shielding belt 12 in the first intermediate region 3d and the second intermediate region 3e.

As an example of the cutting method, the same method as the cutting method of the block in the second embodiment can be adopted.

In the third manufacturing example, the louver layer obtained by cutting the block 100 so that the cut surface becomes five planes bent is a bent sheet, but the sheet is made of resin and is thin, so High flexibility. Therefore, when the obtained bent sheet is placed on a flat surface, it will be flat along the flat surface.

In a flat sheet, as described above, the first cut region 103a corresponds to the first end region 3a, the second cut region 103b corresponds to the second end region 3b, and the third cut region 103c Corresponding to the center region 3c, the fourth cut region 103d corresponds to the first middle region 3d, and the fifth cut region 103e corresponds to the second middle region 3e. Therefore, the louver layer 50 of this embodiment is obtained by the above-mentioned cutting step.

A fourth manufacturing example for manufacturing the viewing angle control body 3 of this embodiment will be described.

The fourth manufacturing example of manufacturing the viewing angle control body 3 is a method having a laminating unit forming step, a laminating body forming step, a block forming step, a cutting step, a first transparent protective layer laminating step, and a second transparent protective layer laminating step. The block forming step, the first transparent protective layer stacking step and the second transparent protective layer stacking step in this example are the same as the block forming step and the first transparent protection in the manufacturing method of the viewing angle control body 1 of the first embodiment The lamination step is the same as the second transparent protective lamination step.

The step of forming a lamination unit is to form a layered body for producing a layered unit formed by alternately laminating a plurality of sheets for a light-transmitting belt and a sheet for a light-shielding belt, and pressurizing the layered body for the layering unit to form a layered unit The block, and then the step of manufacturing the build-up unit by cutting the build-up unit making block in such a way that the installation angle of the shading band becomes the target angle.

The lamination of the sheet for the light-transmitting tape and the sheet for the light-shielding tape when producing the laminate for the production of the laminate unit is the same as the procedure for forming the laminate in the manufacturing method of the first embodiment.

The method of pressing the layered body for manufacturing the layered unit is the same as the step of forming the block in the first embodiment.

The cutting of the block for producing a build-up unit is performed by adjusting the cutting angle and the like to produce the first build-up unit, the second build-up unit, the third build-up unit, the fourth build-up unit and the fifth build-up unit.

The production of the first build-up unit is made in such a manner that the unit in which the sheet for the light-transmitting belt and the sheet for the light-shielding belt are arranged at an angle corresponding to the installation angle of the light-shielding belt in the first end region 3a is formed Cut off with a block.

The production of the second build-up unit is made in such a manner that the unit in which the sheet for the light-transmitting belt and the sheet for the light-shielding belt are arranged at an angle corresponding to the installation angle of the light-shielding belt in the second end region 3b is formed Cut off with a block.

The production of the third build-up unit is to form a block for making the build-up unit in such a manner that the unit in which the sheet for the light-transmitting belt and the sheet for the light-shielding belt are arranged at an angle corresponding to the installation angle of the light-shielding belt in the central region 3c is formed Be cut off.

The production of the fourth build-up unit is to manufacture the build-up unit in such a manner that the unit in which the sheet for the light-transmitting belt and the sheet for the light-shielding belt are arranged at an angle corresponding to the installation angle of the light-shielding belt in the first intermediate region 3d is formed The block is cut off.

The production of the fifth build-up unit is to produce the build-up unit in such a manner that the unit in which the sheet for the light-transmitting belt and the sheet for the light-shielding belt are arranged at an angle corresponding to the installation angle of the light-shielding belt in the second intermediate region 3e The block is cut off.

The layered body forming step in this example is to layer the first layered unit, the second layered unit, the third layered unit, the fourth layered unit and the fifth layered unit obtained by the layered unit forming step to form the layered body Steps. In the foregoing steps, the fourth build-up unit is placed between the first build-up unit and the third build-up unit, the third build-up unit is placed between the fourth build-up unit and the fifth build-up unit, and the fifth build-up unit is placed Each stacking unit is stacked between the third stacking unit and the second stacking unit.

The cutting step in this example is a step of cutting the block obtained by the block forming step to obtain a louver layer.

Examples of the cutting method in the cutting step include, for example, cutting the cutting blade from a surface of the block that exposes both the sheet for light-transmitting tape and the sheet for light-shielding tape so as to be perpendicular to the aforementioned surface At the same time, the method of cutting the sheet for the light-transmitting belt and the sheet for the light-shielding belt at the same time.

In addition, as for another cutting method, it is also possible to cut the cutting blade perpendicularly from a surface of the block body exposed only by the sheet for light-transmitting tape or the sheet for light-shielding tape, and make the cutting blade or block A method of moving and cutting the sheet for the light-transmitting belt and the sheet for the light-shielding belt alternately.

The use form of the viewing angle control body of this 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 ensure peep prevention. In addition, in the present embodiment, the shading bands in the first end region and the second end region are also inclined toward the center region, so that the light emission direction is adjusted to face the user. Therefore, when the user located in the front of the central area views the image displayed on the end area of the display surface, it is easy to recognize because the image enters the angle of view range controlled by the angle of view.

In addition, in this embodiment, since the viewing angle control system has an intermediate region, compared with the viewing angle control body of the second embodiment, the installation angle of the light shielding tape can be finely adjusted, and the light shielding tape of the regions adjacent to each other can be reduced The difference in setting angle.

In recent years, the display surface of the image display device tends to be large. When the viewing angle control body is provided on the display surface, the visibility of the image displayed on the end area of the display surface tends to decrease. However, if the viewing angle control body of the present embodiment is used that can finely adjust the viewing angle and can easily reduce the difference in the installation angle of the light-shielding strips in adjacent areas, even if it is used in an image display device with a large display surface The anti-peeping property and the recognition of the end region can be easily established at the same time.

    <Other embodiments>    

The present invention is not limited to the above embodiment.

For example, the light-transmitting belt and the light-shielding belt may not be formed along the Y direction, or may be formed inclined to the Y direction. When the light-transmitting tape and the light-shielding tape are formed to be inclined with respect to the Y direction, the inclination angle may be, 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, the occurrence of interference fringes can be easily suppressed by using a light-transmitting band and a light-shielding band formed obliquely with respect to the Y direction.

When the light-transmitting belt and the light-shielding belt are formed to be inclined with respect to the Y direction, the shape of each region is a trapezoid or a parallelogram.

In addition, as in the case where the light-transmitting belt and the light-shielding belt are formed along the Y direction in the above embodiment, in order to prevent the occurrence of interference fringes, the viewing angle control body can be provided on the screen such that the light-transmitting belt and the light-shielding belt are displayed relative to the liquid crystal display The short side direction (Y direction) of the screen of the device is inclined. In this case, the inclination angle is also set to, for example, 1 ° or more and 20 ° or less with respect to the Y direction.

In the above-mentioned first embodiment, the installation angle of the light-shielding tape gradually changes over the entire viewing angle control body. In the second and third embodiments, the installation angle of the light-shielding tape is fixed in each region. However, in the present invention, a region where the installation angle of the shading belt gradually changes and a region where the installation angle of the shading belt is fixed may be mixed. For example, the installation angle of the shading tape may be fixed in the first end region and the second end region of the first embodiment. In the first end region and the second end region of the second embodiment, the installation angle of the light-shielding tape may gradually increase as it is separated from the central region. Similarly, in the first end region and the second end region of the third embodiment, the installation angle of the light-shielding tape may gradually increase as it goes away from the central region. In addition, in the first intermediate region and the second intermediate region of the third embodiment, the installation angle of the light-shielding tape may gradually increase as it is separated from the central region.

In addition, the first intermediate region and the second intermediate region of the third embodiment can be further divided into a plurality of regions, and the installation angle of the light shielding band is different in each divided region. However, in this case as well, the installation angle of the shading band provided in the region farther from the central region is larger than the installation angle of the shading band provided in the region closer to the central region. The installation angle of the shading band in each divided area may be fixed or may be gradually changed.

In the present invention, the viewing angle control body may not be rectangular when viewed from above, but may be, for example, a square, or other shapes (polygons other than diamonds, quadrilaterals, circles, ellipses, etc.). However, since the screen of the image display device is generally rectangular, the viewing angle control body of the present invention preferably corresponds to the rectangular shape as in the above embodiment.

When the viewing angle control body is not rectangular when viewed from above, the first end area is an area including one end portion of the viewing angle control body in any direction A along the plane direction of the viewing angle control body, and the second end portion The area is an area including the other end of the viewing angle control body in the aforementioned direction A. The central area is the area between the first end area and the second end area. The direction A can be appropriately determined according to the shape of the viewing angle control body or the shape of the image display body, etc., for example, the direction perpendicular to the long-side direction of the light transmission belt and the light shielding belt can be taken as the direction A.

The viewing angle control body of the present invention may be provided with an adhesive layer on at least one of the surface of the transparent protective layer on the light exit side and the surface of the transparent protective layer on the light entrance side. The adhesive layer is a layer composed of an adhesive or an adhesive with high transparency, and is used to fix the viewing angle control body to an attached body such as an image display body and a touch panel.

The light transmittance of the adhesive layer when the light is incident along the Z direction is preferably above 75%, and more preferably above 85%. 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 an adhesive, for example, acrylic adhesives, urethane adhesives, and rubber adhesives can be used. In addition, an elastomer (elastomer) can be used as an adhesive. Specific examples of the elastomer include silicone rubber, silicone gel, urethane rubber, urethane gel, etc. Among them, silicone rubber is preferable in terms of low residual rubber and high transparency. .

The adhesive may be re-peelable. As long as the releasable adhesive is transparent, commercially available products can be used without limitation.

When the adhesive is composed of an elastomer, re-peelability is obtained by mirror-finishing the surface of the adhesive layer.

When the adhesive layer is composed of an adhesive, for example, an acrylic adhesive, an urethane adhesive, or the like can be used as the adhesive. Among these adhesives, acrylic adhesives are preferred because of their high adhesive strength.

Adhesive and adhesive can be used alone or in combination of two or more.

The method of laminating the adhesive layer may include, for example, a method of applying an adhesive to the surface of the release sheet to form an adhesive layer, and then bonding the adhesive layer to a transparent protective layer to laminate. In addition, other methods of laminating the adhesive layer may include, for example, a method of directly applying an adhesive for forming an adhesive layer to a transparent protective layer to form an adhesive layer, and then laminating the release sheet to the adhesive layer as needed.

In addition, the viewing angle control body of the present invention may not have at least one of the first transparent protective layer and the second transparent protective layer, but may have an adhesive layer instead. That is, it may be a viewing angle control body provided with a first transparent protective layer on the light exit side of the louver layer and an adhesive layer on the light entrance side, or provided on the light exit side of the louver layer The adhesive layer is provided with a viewing angle control body of a second transparent protective layer on the light incident side.

In addition, in the present invention, at least one of the first transparent protective layer and the adhesive layer may not be provided.

When the viewing angle control body of the present invention is used in an image input device equipped with an information input and output device with a touch sensor, usually, the viewing angle control system is disposed between the image display device and the touch panel .

When manufacturing the aforementioned information input / output device, the touch panel can be installed to the viewing angle control body after the viewing angle control body is installed on the image display body, or the image can be displayed after the viewing angle control body is installed on the touch panel The body is mounted to the viewing angle control body.

At the time of installation, the adhesive layer provided on the viewing angle control body may or may not be used.

    [Example]    

Although the following examples are disclosed, the present invention is not limited to this example.

(Example 1)

A viewing angle control body having the structure shown in Fig. 1 was manufactured.

First, a sheet of light-transmitting tape with a thickness of 200 μm composed of transparent silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE153U) was prepared.

In addition, a sheet with a thickness of 20 μm composed of a material made of 100 parts by mass of transparent silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE153U) with 15 parts by mass of carbon black was prepared.

After the plurality of sheets for the light-transmitting tape and the sheets for the light-shielding tape are alternately stacked to form a laminate, the laminate is heated and pressurized to obtain a block body obtained by integrating the plurality of sheets.

Next, the block was cut so that the cut angle of each sheet surface was 5 °, the radius of curvature of the cut surface would be 1240 mm, and the thickness would be 360 μm to obtain the louver layer 10.

Next, a polycarbonate sheet (first transparent protective layer 20) coated with a thermosetting adhesive (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE1825) was laminated on the surface of the obtained louver layer 10 that became the light exit side ), The adhesive is thermally hardened.

Next, a polycarbonate sheet (second transparent protective layer) coated with a thermosetting adhesive (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KE1825) was laminated on the surface of the obtained louver layer 10 that became the light incident side. 30), the adhesive is thermally hardened. Thereby, a viewing angle control body having a rectangular shape in plan view, a length in the long side direction of 340 mm, and a length in the short side direction of 200 mm was obtained.

The obtained viewing angle control body was placed on the paper surface on which the image was printed, and the anti-peeping property and the visibility of the image in the end area of the display surface were visually observed and evaluated. At this time, the distance between the eyes and the paper is 300mm.

The viewing angle control body of this example is not only in the central area, but also in the end area to prevent peeping, and can fully recognize the image of the end area of the display surface.

(Comparative example 1)

The block in Example 1 was cut perpendicular to the surface of each sheet, that is, the cut angle was 0 ° and the thickness was 360 μm to obtain a louver layer. Except this, the viewing angle control body was obtained as in Example 1.

For the viewing angle control body of this example, the anti-peeping property and the visibility of the image of the end region of the display surface were visually observed and evaluated as in Example 1.

Although the viewing angle control body of this example is anti-peeping in the central area and the end area, it cannot recognize the image of the end area of the display surface.

    (Industry availability)    

The viewing angle control body of the present invention not only has the anti-peeping property that it is difficult to recognize the image even if the image displayed by the image display body is peeped, but also ensures the image displayed on the end area of the display surface of the image display body Identification.

According to the method for manufacturing a viewing angle control body of the present invention, a viewing angle control body having the above-mentioned effects can be easily manufactured.

The viewing angle control image display body of the present invention has anti-peeping property, and ensures the visibility of the image displayed on the end area of the display surface of the image display body.

Claims (15)

    A viewing angle control body is provided with a louver layer provided with a plurality of light-transmitting belts and a plurality of light-shielding belts alternately. And one end of the viewing angle control body in the direction A of the plurality of light-shielding strips; the second end area, including the other end of the viewing angle control body in the direction A; and the first end area and the first A central region between the two end regions; wherein at least a portion of the plurality of light-shielding strips provided in the first end region and at least a portion of the plurality of light-shielding strips provided in the second end region In one part, the light exit side of the light-shielding belt is inclined toward the central region; the average value A of the installation angles of the plurality of light-shielding belts provided in the first end region and the complex number of the installation angles provided in the second end region The average value B of the installation angles of each shading zone is larger than the average value C of the installation angles of the plurality of shading zones provided in the central region; the installation angle is the thickness direction of the viewing angle control body and The acute angle between the center line drawn from the light entrance side to the light exit side of the shading band; the average value A, the average value B, and the average value C are each independently 0 ° or more and not Full 90 °.         The viewing angle control body according to item 1 of the patent application range, wherein the viewing angle control system is rectangular when viewed from above, and the direction A is the long side direction of the viewing angle control body.         The viewing angle control body according to item 1 of the patent application range, wherein the average value A and the average value B are each independently 1 ° or more and 20 ° or less, and the average value C is 0 ° or more and less than 4 °.         The viewing angle control body according to item 1 of the patent application scope, wherein there is a first intermediate region between the first end region and the central region, and there is a first intermediate region between the second end region and the central region Two intermediate regions, the average value D of the installation angles of the plurality of light-shielding strips provided in the first intermediate region is smaller than the average value A and greater than the average value C, and the plurality of plurality provided in the second intermediate region The average value E of the installation angle of the shading tape is smaller than the average value B and larger than the average value C.         The viewing angle control body according to item 4 of the patent application range, wherein the average value A and the average value B are each independently 10 ° or more and 20 ° or less, and the average value D and the average value E are each independently 1 ° above and below 10 °, the aforementioned average C is above 0 ° and below 4 °.         The viewing angle control body according to item 1 of the patent application range, wherein the difference between the average value A and the average value C is greater than 0 ° and less than 7.5 °, and the difference between the average value C and the average value B is greater than 0 ° and below 7.5 °.         The viewing angle control body according to item 1 of the patent application range, wherein the installation angle of the light-shielding tape gradually increases from the center of the viewing angle control body along the aforementioned direction A toward the end.         A method for manufacturing a viewing angle control body, comprising: a step of alternately laminating a plurality of sheets for a light-transmitting belt and a plurality of sheets for a light-shielding belt to form a layered body, a step of pressing the layered body to form a block, and The step of cutting the block to form a louver layer, wherein the step of forming the louver layer includes making the cutting angle c of the third cutting region larger than the cutting angle a and the second of the first cutting region The step of cutting the block in such a way that the cutting angle b of the cutting area is small; the third cutting area is located between the first cutting area and the second cutting area; the cutting angle a Is the acute angle between the thickness direction of the block and the tangent plane at any point of the cutting surface of the first cutting area; the cutting angle b is the thickness direction of the block and the second The acute angle between the cut planes of any point on the cut surface of the cut region; the cut angle c is the cut of the thickness direction of the block and any point on the cut surface of the third cut region The acute angle sandwiched by the plane; the aforementioned cutting angle a, Said cut-off angle b, c and the angle of the cutting line are each independently 0 ° or more and less than 90 °.         The method for manufacturing a viewing angle control body as described in item 8 of the patent application range, wherein the step of forming the louver layer includes a step of cutting the block so that the cut surface becomes a curved surface.         The method for manufacturing a viewing angle control body as described in item 9 of the patent application range, wherein the radius of curvature of the curved surface is 200 mm or more and 2000 mm or less.         The method for manufacturing a viewing angle control body according to item 8 of the patent application range, wherein in the step of forming the louver layer, the cutting angle a and the cutting angle b are each independently 1 ° or more and 20 ° or less , The aforementioned cutting angle c is 0 ° or more and less than 4 °.         The method for manufacturing a viewing angle control body according to any one of claims 8 to 11, wherein the step of forming the louver layer further includes: in the first cut region and the third cut region The step of forming a fourth cut region between them, and the step of forming a fifth cut region between the second cut region and the third cut region; and the cut angle d of the fourth cut region is It is smaller than the cutting angle a and larger than the cutting angle c, and the cutting angle e of the fifth cutting region is smaller than the cutting angle b and larger than the cutting angle c.         The method for manufacturing a viewing angle control body according to item 12 of the patent application range, wherein in the step of forming the louver layer, the cutting angle a and the cutting angle b are each independently 10 ° or more and 20 ° or less , The cutting angle c is 0 ° or more and less than 4 °, and the cutting angle d and the cutting angle e are each independently 1 ° or more and less than 10 °.         A viewing angle control image display body includes an image display body and the viewing angle control body according to any one of items 1 to 7 of the patent application scope provided on the image display surface of the image display body.         The angle-of-view control image display as described in item 14 of the patent application range, wherein the secret information is displayed on the image display body, and the central area of the angle-of-view control body overlaps the area where the secret information is displayed.