JP2019082540A - Information communication equipment, display part, and laminate - Google Patents

Abstract

To provide information communication equipment capable of satisfactorily receiving information by a portable terminal even under an environment where illuminance of external light is high.SOLUTION: Information communication equipment 100 comprises: a display part for displaying an image; and a transmission part having a light source which emits light from a rear surface of the display part, for transmitting information by using the light emitted from the light source as signal light, therein the signal light transmitted from the transmission part is received via the display part by a portable terminal 200. The display part is configured such that a light diffusion plate, a light adjustment layer and a print layer are laminated in order from a side opposite to the transmission part, and the print layer has light transmitting property for transmitting light made incident to the display part, and the light diffusion plate has light reflecting property for reflecting the light transmitted through the light adjustment layer, and the light adjustment layer has light attenuating property for attenuating the light made incident to the display part.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to an information communication device, a display unit, and a laminate.

  In recent years, an information communication apparatus such as digital signage is used as a tool for providing information to an unspecified number of people in a public place (for example, Patent Documents 1 and 2). Such an information communication apparatus has a display unit capable of displaying an advertisement image, a promotion image, and the like. The information communication apparatus further includes a transmission unit that emits signal light from the back of the display unit. The transmitter can transmit information by blinking the signal light. Then, the signal light emitted from the transmission unit can be received using a portable terminal or the like. Therefore, the user of the portable terminal can obtain and browse the information transmitted from the information communication apparatus via the portable terminal.

JP, 2015-119458, A International Publication No. 2015/125179

  For example, when the information communication apparatus is used outdoors where the sunlight is strong, there is a problem that it is difficult for the portable terminal to receive the information transmitted from the information communication apparatus under an environment where the illuminance of external light is high.

  The present disclosure has been made in view of the above circumstances, and it is a main object of the present invention to provide an information communication apparatus capable of favorably receiving information by a portable terminal even in an environment where the illuminance of external light is high. Do.

  The present disclosure includes a display unit that displays an image, and a transmission unit that includes a light source that emits light from the back of the display unit, and transmits information from the light source as signal light. The signal light transmitted from the transmission unit is an information communication apparatus received by a portable terminal via the display unit, the display unit including a light diffusion plate in order from the side facing the transmission unit, A light adjustment layer and a print layer are laminated, the print layer has light transmissivity to transmit light incident on the display unit, and the light diffusion plate reflects light transmitted through the light adjustment layer. In the information communication device, the light adjustment layer has a light attenuating property that attenuates the light incident on the display unit.

  Further, in the present disclosure, a display unit for displaying an image, a light source for emitting light from the back of the display unit, and a transmitting unit for transmitting information by using light emitted from the light source as signal light are included. The signal light transmitted from the transmission unit is an information communication apparatus received by the portable terminal via the display unit, and the display unit sequentially transmits light from the side facing the transmission unit. A plate, an optical function layer, and a print layer are laminated, the print layer has light transmissivity to transmit light incident on the display unit, and the light diffusion plate is light transmitted through the optical function layer In the information communication apparatus, the optical function layer has a light collecting function of collecting the signal light transmitted from the transmission unit.

  Further, in the present disclosure, a display unit for displaying an image, a light source for emitting light from the back of the display unit, and a transmitting unit for transmitting information by using light emitted from the light source as signal light are included. The signal light transmitted from the transmission unit is an information communication apparatus received by the portable terminal via the display unit, and the display unit sequentially transmits light from the side facing the transmission unit. A plate and a print layer are laminated, the print layer has light transmissivity to transmit light incident on the display section, and the light diffusion plate reflects light transmitted through the print layer. Abstract: An information communication apparatus is provided, which has an opening for transmitting part of light incident on the display unit.

  Further, in the present disclosure, a transmission unit having a light source for emitting light and transmitting information using the light emitted from the light source as signal light is provided, and the signal light transmitted from the transmission unit is a portable terminal And the display unit displays an image, and the light diffusion plate, the light adjustment layer, and the print layer are stacked in order from the side facing the transmission unit. The printing layer has a light transmitting property for transmitting light incident on the display unit, and the light diffusing plate has a light reflecting property for reflecting the light transmitted through the light adjusting layer, The light adjustment layer provides a display unit having light attenuating property that attenuates the light incident on the display unit.

  Furthermore, in the present disclosure, it has a light source for emitting light, has a transmitting unit for transmitting information using the light emitted from the light source as signal light, and the signal light transmitted from the transmitting unit is a portable terminal Used in a display unit used in an information communication apparatus, the display unit displays an image, and has a light diffusion plate on the side facing the transmission unit, and the light diffusion plate is incident The light adjustment layer and the print layer are laminated in order from the side opposite to the side facing the transmission unit of the light diffusion plate, and the print layer is the display. The laminate has a light transmitting property to transmit light incident on a part, and the light adjusting layer has a light attenuating property to attenuate light incident on the display part.

  The information communication apparatus of the present disclosure has the effect of being able to better receive information by the portable terminal even in an environment where the illuminance of external light is high.

It is an explanatory view for explaining an information communication device of this indication. It is an explanatory view for explaining an information communication device of this indication. It is explanatory drawing for demonstrating the 1st embodiment of the light adjustment layer in an aspect of A. FIG. It is explanatory drawing for demonstrating the 2nd embodiment of the light adjustment layer in an aspect of A. FIG. It is explanatory drawing for demonstrating the 3rd embodiment of the light adjustment layer in an aspect of A. FIG. It is an explanatory view for explaining an information communication device of this indication. It is a schematic perspective view which shows an example of the optical function layer in this indication. It is a schematic sectional drawing which shows the other example of the optical function layer in this indication. It is a schematic sectional drawing which shows the other example of the optical function layer in this indication. It is an explanatory view for explaining an information communication device of this indication. It is a schematic sectional drawing which shows an example of the low reflection layer in this indication. It is explanatory drawing for demonstrating the light adjustment layer in the aspect of B. FIG. It is explanatory drawing for demonstrating the light adjustment layer in the aspect of C. FIG. It is an explanatory view explaining composition of reference example 1 and a comparative example.

  In this specification, when a certain configuration such as a certain member or a certain region is "above (or below)" or "on the surface" of another configuration such as another member or another region, Unless limited, this includes not only directly above (or just below) other configurations, but also above (or below) other configurations, ie, above (or below) other configurations It also includes the case where another component is included in between.

  Hereinafter, embodiments of the present disclosure will be described with reference to the drawings and the like. However, the present disclosure can be implemented in many different aspects, and is not construed as being limited to the description of the embodiment exemplified below. In addition, the drawings may be schematically represented as to the width, thickness, shape, etc. of each portion in comparison with the embodiment in order to clarify the description, but this is merely an example, and the interpretation of the present disclosure is not limited. It is not limited. In the specification and the drawings, the same elements as those described above with reference to the drawings already described may be denoted by the same reference numerals, and the detailed description may be appropriately omitted. Moreover, although it may be demonstrated using the words "upper" or "lower" for convenience of explanation, the vertical direction may be reversed.

  Hereinafter, the information communication device, the display unit, and the laminate of the present disclosure will be described in detail. In the present specification, the terms "sheet", "film", and "plate" are not distinguished from one another based only on the difference in designation. Thus, for example, "sheet" is a concept that also includes members that may be called films or plates.

I. Information Communication Device The information communication device of the present disclosure has a display unit for displaying an image and a light source for emitting light from the back of the display unit, and transmits information using the light emitted from the light source as signal light. And the signal light transmitted from the transmission unit is received by the portable terminal via the display unit.

An information communication apparatus of the present disclosure will be described using the drawings. FIG. 1 and FIGS. 2A and 2B are explanatory diagrams for explaining the information communication apparatus of the present disclosure. As shown in FIG. 1 and FIGS. 2A and 2B, the information communication apparatus 100 of the present disclosure uses the display unit 10 for displaying an image and light from the back of the display unit 10 as signal light h _y for information. And a transmitting unit 20 for transmitting. As shown in FIG. 1 and FIG. 2B, the signal light h _y transmitted from the transmission unit 20 is received by the portable terminal 200 via the display unit 10.

The conventional information communication apparatus has a problem that it is difficult for the portable terminal to receive information transmitted from the information communication apparatus in an environment where the illuminance of external light is high, for example, when used outdoors where the sunlight is strong . It is presumed that the signal light transmitted from the transmission unit of the information communication apparatus is difficult to read because the contrast ratio (SN ratio) is lowered in an environment where the illuminance of the external light is high. In addition, this is considered to be clear by the reference example and comparative example which are mentioned later.
On the other hand, according to the present disclosure, by setting the display unit to a predetermined configuration, it is possible to control the light amount of the external light or to increase the intensity of the signal light. As a result, it is possible to suppress a decrease in the contrast ratio, and it is possible to favorably receive information transmitted from the information communication apparatus, that is, signal light transmitted from the transmitter by the portable terminal. In addition, about the principle which can control the light quantity of external light, or the principle which can intensify the intensity | strength of signal light by making a display part into a predetermined structure, it is mentioned in the term of "A. Display part" mentioned later. For the sake of explanation, the description here is omitted.

  Hereinafter, the configuration of the information communication apparatus will be described.

A. Display Unit The display unit in the present disclosure is a member that displays an image. The display unit will be described by dividing it into an aspect of A, an aspect of B, and an aspect of C.

1. Aspect of A The display unit includes a light diffusion plate, a light adjustment layer, and a print layer sequentially stacked from the side facing the transmission unit, and the print layer transmits light that transmits light incident on the display unit. The light diffusing plate has a light reflectivity that reflects the light transmitted through the light adjusting layer, and the light adjusting layer has a light attenuating property that attenuates the light incident on the display unit. .

The display unit will be described with reference to the drawings. As shown in FIGS. 2A and 2B, the display unit 10 has a configuration in which the light diffusion plate 3, the light adjustment layer 2, and the printing layer 1 are sequentially stacked from the side facing the transmission unit 20. At this time, the print layer 1 has light transmissivity to transmit the light h _x incident on the display unit 10, and the light diffusion plate 3 has light reflectivity to reflect the light transmitted through the light adjustment layer 2. Furthermore, the light adjustment layer 2 has a light attenuating property that attenuates the light incident on the display unit 10. Therefore, as shown in FIG. 2A, the light h _x incident on the display unit 10 passes through the printing layer 1 and is attenuated by the light adjustment layer 2 and then enters the light diffusion plate 3. The light incident on the light diffusion plate 3 is reflected by the light diffusion plate 3 and emitted from the surface of the display unit 10 on the printing layer 1 side. When the light h _x incident on the display unit 10 is emitted from the surface of the display unit 1 on the printing layer 1 side, the user can visually recognize the image displayed by the display unit 10.

  Hereinafter, each configuration of the display unit will be described.

(1) Light Adjustment Layer The light adjustment layer is a member disposed between a light diffusion plate to be described later and the printing layer. In addition, the light adjustment layer is a member having light attenuating property that attenuates light incident on the display unit.

  Here, "having a light attenuating property for attenuating light incident on the display portion" means that light (external light) incident on the display portion is reflected by the light diffusion plate provided in the display portion and emitted again from the display portion It indicates that the amount of light emitted from the display unit (external light amount) decreases with respect to the amount of light incident to the display unit (external light amount). The ratio of the light quantity (external light quantity) emitted from the display part to the light quantity (external light quantity) incident on the display part is, for example, 80% or less, preferably 60% or less, in particular 50% or less Is preferred. Since the ratio of the light quantity (external light quantity) emitted from the display part to the light quantity (external light quantity) incident on the display part has the above-described upper limit, the portable terminal can be used even in an environment where the illuminance of external light is high. The effect that the information can be well received can be sufficiently obtained. On the other hand, the ratio of the light quantity (external light quantity) emitted from the display part to the light quantity (external light quantity) incident on the display part is, for example, 20% or more. The ratio of the light quantity (external light quantity) emitted from the display part to the light quantity (external light quantity) incident on the display part has the above-described lower limit, so that a predetermined value is obtained from the side opposite to the viewing side of the printing layer. Since the quantity of light can be emitted, the display of the printing layer can be performed well.

  The light adjustment layer is not particularly limited as long as it is a layer having the light attenuation property as described above, and examples thereof include the following light adjustment layer. That is, a light adjustment layer (first embodiment) in which a deflection plate and a retardation layer are laminated in order from the side facing the printing layer, and a light shielding layer containing a light shielding material for shielding light incident on the display unit The light shielding layer contains a light adjustment layer (second embodiment) having an opening for transmitting a part of light incident on the display portion, and a light shielding material for shielding light incident on the display portion A semitransparent layer is included, and the semitransparent layer includes a light adjustment layer (third embodiment) and the like having a semitransparent property to semitransmit light incident on the display portion.

  Hereinafter, the light adjustment layer will be described by dividing it into the first embodiment, the second embodiment and the third embodiment.

(A) First Embodiment The first embodiment is an embodiment in which the light adjusting layer is laminated with a polarizing plate and a retardation layer in this order from the side facing the printing layer. That is, the light adjustment layer of this aspect has a function as a circularly polarizing plate.

The light adjustment layer of this aspect will be described with reference to the drawings. FIGS. 3A and 3B are explanatory diagrams for explaining the light adjustment layer of this embodiment. As shown to Fig.3 (a), the light adjustment layer 21 of this aspect has the deflection plate 21a and the phase difference layer 21b. FIGS. 3A and 3B show an example in which the λ / 4 plate 21b is used as the retardation layer 21b. As shown in FIG. 3 (a), when the external light h _x on the display unit 10 is incident external light h _x that has passed through the printing layer 1 is changed to linearly polarized light transmitted through the polarizing plate 21a. Next, linearly polarized light is changed to circularly polarized light by transmitting through the λ / 4 plate 21 b. Thereafter, the circularly polarized light reflected by the light diffusion plate 3 is again transmitted through the λ / 4 plate 21 b to become linearly polarized light orthogonal to the time of incidence, whereby the reflected light is absorbed by the deflection plate 21 a . Thereby, the light emitted from the display unit 10 is attenuated. On the other hand, as shown in FIG. 3B, the signal light h _y transmitted from the transmission unit 20 is transmitted in order of the λ / 4 plate 21 b and the polarization plate 21 a because the polarization is not changed by the deflection plate 21 a. be able to.

  The polarizing plate in this aspect, for example, decomposes the transmitted light into two orthogonal polarization components, transmits the polarization component in one direction (a direction parallel to the transmission axis), and the other direction orthogonal to the one direction. It can absorb polarization components (in a direction parallel to the absorption axis). Such a polarizing plate can be formed by adsorbing and orienting iodine compound molecules on a film material made of polyvinyl alcohol (PVA).

  The retardation layer in this embodiment is, for example, a retardation layer (λ / 4 plate) whose in-plane retardation value corresponds to λ / 4, and a retardation layer (λ /) whose in-plane retardation value corresponds to λ / 2. 2), and a retardation layer including a positive C plate (+ C plate). The combination and configuration of the retardation layer can be appropriately adjusted according to the application of the information communication apparatus of this aspect, and the like, and is not particularly limited.

  The total thickness of the polarizing plate and the retardation layer is, for example, 400 μm or less. The thickness of the polarizing plate is, for example, 0.5 μm or more, and may be 30 μm or more. In addition, the thickness of the deflection plate is 300 μm or less, and may be 100 μm or less. The thickness of the retardation layer is 0.5 μm or more, and may be 1 μm or more. The thickness of the retardation layer may be 9.5 μm or less, and may be 5 μm or less. In addition, when a deflection | deviation board is a film laminated | stacked in order of the TAC base material / PVA / TAC base material as used in the reference example mentioned later, the thickness of a deflection | deviation board points out the thickness of only PVA. When the retardation layer is a retardation film based on TAC as used in a reference example described later, the thickness of the retardation layer is the thickness obtained by removing the thickness of TAC from the thickness of the retardation film. Point to

  The other details of the deflecting plate and the retardation layer may be the same as those generally known, and thus the description thereof is omitted here.

(B) Second Embodiment In the second embodiment, the light adjustment layer has a light shielding layer containing a light shielding material for shielding light incident on the display unit, and the light shielding layer is formed of light incident on the display unit. This is an aspect having an opening for transmitting a part.

The light adjustment layer of this aspect will be described with reference to the drawings. FIG. 4A and FIG. 4B are explanatory diagrams for explaining the light adjustment layer of this aspect. As shown to FIG. 4 (a), (b), the light adjustment layer 22 of this aspect has the opening part 22b formed in the light shielding layer 22a and the light shielding layer 22a. As shown in FIG. 4 (a), when the external light h _x on the display unit 10 is incident external light h _x that has passed through the printing layer 1 is absorbed by the light-shielding layer 22a containing a light-shielding material, other A portion of the external light h _x is transmitted through the opening 22 b. External light h _x transmitted through the light control layer 22 in this manner is reflected on the light diffusing plate 3, enters the optical adjustment layer 22 again. At this time, the reflected light that has entered the light shielding layer 22a is absorbed, and the other reflected light is transmitted through the opening 22b. Thereby, the light emitted from the display unit 10 is attenuated. On the other hand, as shown in FIG. 4B, the signal light h _y transmitted from the transmitter 20 depends on the type of the light shielding material contained in the light shielding layer 22a, but the external light h described in FIG. _Since the number of times of light transmission through the light adjustment layer 22 is smaller than _x , the light attenuation effect can be suppressed.

The light shielding layer in this aspect contains a light shielding material. Here, the light shielding material differs depending on the type of light incident on the display unit, but for example, a material capable of shielding sunlight if the light incident on the display unit is sunlight Is preferred. For example, the light shielding property of the light shielding layer to external light may have an OD value of 2.0 or more, 3.0 or more, or 4.0 or more. Here, the OD value is an optical density (OD) value and indicates a so-called optical density. In addition, the OD value is specified by “log ₁₀ (I _in / I _out )” using the intensity I _{in of the} incident light that is vertically incident and the intensity I _{out of the} transmitted light that is transmitted perpendicularly, and the microspectrophotometric colorimeter It can be measured by (OSP-SP200, manufactured by Olympus Corporation).

  The light shielding material contained in the light shielding layer can be appropriately selected according to the type of external light, and it is preferable that the light shielding layer be a material that can achieve the above-described light shielding rate. Specific examples of the light shielding material include black pigments, white pigments, and chromatic pigments such as red, green and blue. Examples of black pigments include inorganic pigments such as metal oxides such as carbon black, titanium black and black iron oxide, and metal sulfides such as bismuth sulfide; and organic pigments such as phthalocyanine black. Examples of white pigments include aluminum oxide, titanium oxide and calcium oxide. As other chromatic color pigments, generally known materials can be used, and for example, color pigments disclosed in JP-A-2015-014733 can be used. In addition, the said light shielding material may be used individually by 1 type, and may mix and use 2 or more types. The light shielding material is usually contained in a binder resin. As the binder resin, for example, a thermoplastic resin, a thermosetting resin, etc. can be used, and more specifically, polycarbonate resin, acrylic resin, fluorine acrylic resin, silicone acrylic resin, epoxy acrylate resin, polystyrene Resin, cycloolefin polymer, methylstyrene resin, fluorene resin, polyethylene terephthalate (PET), polypropylene, acrylonitrile-styrene copolymer, acrylonitrile-polystyrene copolymer, and the like can be mentioned.

  The thickness of the light shielding layer is preferably such a thickness that the light shielding layer can achieve the light shielding property described above, and can be appropriately adjusted according to the type of the light shielding material contained in the light shielding layer. For example, in the case of using a black pigment as the light shielding material, the thickness of the light shielding layer is, for example, 0.5 μm or more and 3 μm or less. On the other hand, when using another material as a light shielding material, the thickness of the light shielding layer is 3 micrometers or more and 15 micrometers or less, for example.

  The light shielding layer has an opening for transmitting part of light incident on the display portion. The number of openings may be one, but usually it is a plurality of two or more.

  The light adjustment layer can attenuate the light incident on the display unit by the light adjustment layer, and the signal light transmitted from the transmission unit is displayed. It is preferable that it is an area ratio of the extent which can radiate | emit from a part. The specific area ratio can be appropriately adjusted according to the type of the light shielding material contained in the light shielding layer and the installation place of the information communication apparatus, and is not particularly limited. The area ratio is, for example, preferably 1:10 or more and 10: 1 or less, and more preferably 1: 5 or more and 5: 1 or less.

  The plan view shape of the opening formed in the light shielding layer can be appropriately selected depending on how much the amount of incident external light is to be controlled. For example, the shape in plan view of the opening may be circular, rectangular, lattice, or the like. In addition, an elliptical shape is also included in the circular shape here. Also, a large number of openings are usually formed. Therefore, the plan view shape of many openings may be the same or different.

  The size of the shape of the opening in a plan view is preferably a size that satisfies the above-described area ratio.

  When a plurality of openings are formed in the light shielding layer, it is preferable that the adjacent openings have a predetermined distance. For example, the aperture ratio of the light shielding layer can be, for example, 20% or more and 80% or less. When the aperture ratio of the light shielding layer is in the above range, external light incident on the display unit can be attenuated, and the occurrence of a problem that reception of signal light transmitted from the transmission unit is hindered is suppressed. be able to.

(C) Third Embodiment In the third embodiment, the light adjustment layer has a semi-transmissive layer containing a light-shielding material that blocks light incident on the display portion, and the semi-transmissive layer is incident on the display portion It is an aspect which has translucency which transmisses light.

The light adjustment layer of this aspect will be described with reference to the drawings. FIG. 5A and FIG. 5B are explanatory diagrams for explaining the light adjustment layer of this aspect. As shown in FIGS. 5 (a) and 5 (b), the light adjustment layer 23 of this embodiment has a semi-transmissive layer 23a containing a light shielding material that blocks light incident on the display unit 10. The semi-transmissive layer 23 a is semi-transmissive to semi-transmit light incident on the display unit 10. Therefore, as shown in FIG. 5 (a), when the external light h _x is incident to the display unit 10, the external light h _x that has passed through the printing layer 1, part a semi-permeable layer 23a containing a light-shielding material It is absorbed and the other external light h _x is transmitted. External light h _x transmitted through the light control layer 23 in this manner is reflected on the light diffusing plate 3, enters the light adjustment layer 23 again. At this time, part of the reflected light that has entered the semi-transmissive layer 23a is absorbed, and the other reflected light is transmitted. Thereby, the light emitted from the display unit 10 is attenuated. On the other hand, as shown in FIG. 5B, the signal light h _y transmitted from the transmitter 20 depends on the type of the light shielding material contained in the semi-transmissive layer 23a, but the external light described in FIG. Since the number of times of light transmission through the light adjustment layer 23 is smaller than h _x , the light attenuation effect can be suppressed.

  The semipermeable layer is a layer having semitransparency. Here, "having translucency" refers to having a function of transmitting part of incident light. Specifically, the visible light transmittance of the semitransparent layer is, for example, 10% or more, and may be 20% or more, or 30% or more. Further, the visible light transmittance of the semitransparent layer is, for example, 80% or less, and may be 70% or less, or 60% or less. The visible light transmittance of the semitransparent layer is measured, for example, with a UV-visible near-infrared spectrophotometer (for example, UV-visible near-infrared spectrophotometer UV-3100 manufactured by Shimadzu Corporation), and the visible light region 380 nm to 780 nm Obtained by calculating the average transmittance of The semi-transmissive property of the semi-transmissive layer can be appropriately adjusted in accordance with the content of the light-shielding material and the thickness of the semi-transmissive layer.

  The semi-transmissive layer contains a light shielding material that blocks light incident on the display unit. The light-shielding material can be the same as the light-shielding material described in the section “(ii) Second embodiment”, and thus the description thereof is omitted here.

  The thickness of the semi-transmissive layer can be appropriately adjusted depending on the type and content of the light-shielding material used for the semi-transmissive layer, and is not particularly limited, and is, for example, 10 μm to 5000 μm.

(2) Light Diffusing Plate The light diffusing plate is a member having light reflectivity that reflects the light transmitted through the light adjustment layer. That is, as shown in FIG. 2A, the light diffusion plate has light reflectivity that reflects the light transmitted through the printing layer 1 and the light adjustment layer 2 when the external light h _x enters the display unit 10 . Further, as shown in FIG. 2B, the light diffusion plate can transmit the signal light h _y transmitted from the transmission unit 20. The light diffusing plate has a light diffusing property for diffusing the signal light h _y transmitted from the transmission unit. As described above, the light diffusion plate in the present disclosure is a semitransparent member provided with light reflectivity for reflecting external light and light transparency for transmitting signal light.

  It is preferable that the light diffusion plate having translucency have predetermined light reflectivity and light transparency. Specifically, it is preferable that the light diffusion plate has light reflectivity to such an extent that it can reflect the light transmitted through the light adjustment layer. For example, the visible light reflectance of the light diffusion plate may be 10% or more, and may be 30% or more. Also, for example, the visible light reflectance of the light diffusion plate may be 90% or less and 80% or less. The visible light reflectance of the light diffusing plate can be measured by an ultraviolet visible near infrared spectrophotometer (V-670DS) manufactured by JASCO Corporation. Moreover, it is preferable that the light diffusion plate has a light transmittance to such an extent that the signal light transmitted from the transmission unit can be transmitted. For example, the visible light transmittance of the light diffusing plate may be 10% or more, and may be 20% or more. Also, for example, the visible light transmittance of the light diffusing plate may be 90% or less and 70% or less. The visible light transmittance of the light diffusing plate can be measured by an ultraviolet visible near infrared spectrophotometer (V-670DS) manufactured by JASCO Corporation.

  In the display unit in this aspect, the light diffusion plate, the light adjustment layer, and the print layer are stacked in order from the side facing the transmission unit. That is, the light diffusion plate is disposed on the side opposite to the side on which the printing layer of the light adjustment layer is disposed. At this time, the light diffusion plate may be in direct contact with the light adjustment layer, or may have a predetermined distance between the light diffusion plate and the light adjustment layer. Preferably, the light diffusion plate is in direct contact with the light adjustment layer. As the distance between the light diffusion plate and the light adjustment layer increases, the signal light emitted from the transmission unit and diffused by the light diffusion plate spreads before reaching the light adjustment layer, especially in the second embodiment. In the case of using the light adjustment layer of the aspect, there is a possibility that the signal light may not be easily transmitted from the opening of the light adjustment layer.

  As a material used for a light diffusing plate, it is preferable that it is a material which can comprise the light diffusing plate which has the function mentioned above. Examples thereof include resin materials exhibiting a translucent milky white color, resin materials in which particles are dispersed, and the like, and the materials described in JP-A-8-272325 and Utility Model Registration No. 3103449 may be used. it can.

  The light diffusion plate may have a patterned opening. Even when the illuminance of external light entering the information communication device is high, the opening of the light diffusion plate can reduce external light reflection. Therefore, the light amount of the reflected light emitted from the back of the display unit can be controlled, and the signal light transmitted from the transmission unit can be favorably received. In addition, since signal light can be transmitted from the opening of the light diffusion plate, reception of signal light by the portable terminal can be favorably performed. The shape, size, etc. of the opening can be the same as the opening described in “(a) Light adjustment layer (ii) Second embodiment”, and the description thereof is omitted here. .

  The thickness of the light diffusion plate is preferably such a thickness that can exhibit the above-mentioned semi-transmission, and may be, for example, 0.1 mm or more, and may be 1 mm or more. Further, the thickness of the light diffusion plate is, for example, 10 mm or less, and may be 5 mm or less.

  As a formation method of a light diffusing plate, it is preferable that it is a method which can be formed in the surface on the opposite side to the printing layer of a desired light adjustment layer, for example. Specifically, the method of apply | coating the coating liquid containing the material which comprises a light-diffusion plate on one side of a light adjusting layer is mentioned. For the coating method, conventionally known methods can be used. Moreover, as a formation method of a light-diffusion board, the method of sticking a film-form light-diffusion board on the surface on the opposite side to the printing layer of a light adjustment layer is mentioned.

(3) Printed Layer The printed layer has light transmissivity to transmit light incident on the display portion. That is, as shown in FIG. 2A, the print layer can transmit external light h _x incident on the display body 10. Also, as shown in FIG. 2B, the signal light h _y transmitted from the transmission unit 20 can be transmitted. The printing layer is a layer on which the image to be displayed by the display unit is drawn. When the information communication apparatus is used in a bright environment such as daytime, outside light such as sunlight is reflected by the light diffusion plate. The reflected light allows the user to view the image by illuminating the print layer from the back. On the other hand, when the information communication apparatus is used in a dark environment such as night, the print layer is illuminated from the back by irradiating light from the back of the display unit with a backlight or the like, and the user views the image. It becomes possible.

  In the display unit in this aspect, the light diffusion plate, the light adjustment layer, and the print layer are stacked in order from the side facing the transmission unit. That is, the printing layer is disposed on the side opposite to the side on which the light diffusion plate of the light adjustment layer is disposed. At this time, the print layer may be in direct contact with the light control layer, or may have a predetermined distance between the print layer and the light control layer. For example, when using the light modulating layer of the first embodiment, the printing layer may be in direct contact with the light modulating layer. On the other hand, when using the light adjustment layer of the second embodiment or the third embodiment, it is preferable to have a predetermined distance between the printing layer and the light adjustment layer. This is because the color tone and the opening of the light adjustment layer may be seen through the print layer, and the visibility of the image drawn on the print layer may be reduced.

  The print layer is a layer on which a predetermined image is drawn. As a material used for drawing an image, it is a material which can be used for the printing method, and it is preferable that it is a material which has light transmittance. As such a material, an inorganic pigment, an organic pigment, etc. are mentioned, for example. Examples of the inorganic pigment include iron ferrocyanide, iron oxide, cadmium pigments, titanium oxide, alumina, calcium carbonate, barium sulfate and the like. In addition, as the organic pigment, for example, insoluble azo pigment pigment, azo lake pigment, stalocyanine pigment, chelate pigment, nitro pigment, geoindigo pigment, anthraquinone pigment, perylene pigment, quinacridone pigment, graphene As a system pigment and a dioxazine system pigment, a condensation type azo system pigment etc. are mentioned. In addition, you may mix and use 2 or more types of these pigments as needed. Moreover, additives, such as a filler, a plasticizer, a dispersing agent, a lubricant, an antistatic agent, an antioxidant, and a mildew-proof agent, can be suitably used for the said material as needed.

  The print layer can be obtained, for example, by printing the above-described material on a transparent substrate. In addition, about a transparent base material used for a printing layer, since a generally well-known material can be used and it does not specifically limit, description here is abbreviate | omitted.

  The thickness of the print layer can be appropriately adjusted in accordance with the image drawn on the print layer, the use of the information communication device, the size, and the like.

  The method of forming the printing layer is preferably a method capable of forming a printing layer on which a desired image is drawn, and for example, a method of drawing an arbitrary image by a printing method using the above-described material is mentioned. Be In addition, since a generally well-known method can be employ | adopted as a specific printing method, description here is abbreviate | omitted.

(4) Others The display unit may have at least the light adjustment layer, the light diffusion plate, and the printing layer described above, but may have other layers as necessary. As another layer, an optical function layer, a low reflective layer, an adhesion layer etc. are mentioned, for example.

(A) Optical functional layer In this aspect, when the light adjustment layer of the second embodiment is used, the display unit condenses the signal light transmitted from the transmission unit between the light diffusion plate and the light adjustment layer. You may have the optical function layer provided with the condensing function.

  Such an optical function layer is not particularly limited as long as it is a member having a light collecting function for collecting signal light. As a specific optical function layer, for example, a layer having a unit prism, a layer having a Fresnel lens, etc. may be mentioned. In the present specification, an optical functional layer having a unit prism will be described below as an example of the optical functional layer.

  For example, as shown in FIG. 6, the display unit may have the optical function layer 4 between the light diffusion plate 3 and the light adjustment layer 22. In addition, since the code | symbol which is not demonstrated in FIG. 6 can be made to be the same as that of the other above-mentioned FIG. 2 (b), description here is abbreviate | omitted. By having the optical functional layer as another member, it is possible to condense signal light transmitted from the transmission unit, and to enable better reception of signal light.

  The optical functional layer is a layer having a desired light collecting function. Such an optical functional layer is preferably, for example, a layer having a unit prism. Specifically, as shown in FIG. 7, it is preferable that the optical functional layer 4 has a plurality of unit prisms 41 arranged. Further, the arrangement direction X of the unit prisms 41 is perpendicular to the light guide direction Y. Further, it is preferable that the plurality of unit prisms 41 be arranged without gaps in the direction X perpendicular to the light guiding direction Y, and each unit prism 41 extends linearly along the light guiding direction Y. Is preferred. Furthermore, each unit prism 41 is preferably formed in a columnar shape, and preferably has the same cross-sectional shape along its longitudinal direction. The optical functional layer 4 shown in FIG. 7 is an example of a configuration having a plurality of unit prisms 41 and a main body 42.

  FIG. 8 is a cross-sectional view taken along line B-B of FIG. As shown in FIG. 8, the cross-sectional shape 41 a of each unit prism 41 in the optical function layer 4 has a shape that protrudes to the emission surface side of the signal light transmitted from the transmission unit, that is, the user side of the information communication apparatus. Can. Here, the protrusion height of the cross-sectional shape of the unit prism is H, and the width of the bottom is W. FIG. 8 shows an example in which the cross-sectional shape of the unit prism 41 is triangular.

For example, as shown in FIG. 8, when the normal N to the bottom surface of the unit prism 41 is drawn, the signal light h _y incident on the optical function layer 4 can be narrowed to the normal N side. That is, the light collecting effect can be exerted on the signal light h _y incident on the optical function layer 4.

The optical functional layer may be a single layer, or two or more layers may be stacked. For example, as shown in FIG. 9, two layers are preferably stacked. When two or more optical function layers are laminated, as shown in FIG. 9, it is preferable that the extension directions of the unit prisms 41 formed in a columnar shape are different from each other. Among them, as shown in FIG. 9, it is preferable that the extension direction of the unit prism 41 in one optical function layer 4a and the extension direction of the unit prism 41 in the other optical function layer 4b are orthogonal to each other. The condensing action of the signal light h _y by the optical function layer can be made effective.

  The cross-sectional shape of the unit prism can be a shape that protrudes toward the emission surface side of the signal light transmitted from the transmission unit, that is, the user side of the information communication apparatus. Here, the cross-sectional shape of the unit prism refers to, for example, the shape of the region surrounded by the broken line 41 a in FIG. 8. Specific cross-sectional shapes of the unit prisms include, for example, various polygonal shapes such as triangular shapes, quadrangular shapes such as trapezoidal shapes, pentagonal shapes, and hexagonal shapes. Also, the cross-sectional shape of the unit prism may be a shape corresponding to a part of a circular shape or an elliptical shape. Among them, the cross-sectional shape of the unit prism is preferably a triangle, and more preferably an isosceles triangle. In addition, as a cross-sectional shape of the unit prism, for example, as shown in FIG. In particular, it is preferable that the cross-sectional shape of the unit prisms is an isosceles triangle, and the isosceles triangles of the cross section be arranged to be symmetrical about the normal line N. This is because the luminance in the normal direction can be improved for the light emitted from the unit prism. Furthermore, when the cross-sectional shape of the unit prism is an isosceles triangle, from the viewpoint of improving the luminance in the normal direction, the apex angle located between the equal sides and projecting on the light emission surface side is 60 ° The angle is preferably 120 ° or less, more preferably 80 ° to 100 °, and particularly preferably 90 °.

  The protrusion height of the unit prism can be appropriately adjusted according to the size of the information communication apparatus and the like, and is not particularly limited. The specific protrusion height of the unit prism is, for example, 10 μm or more, and may be 30 μm or more. Further, the protrusion height of the unit prism is, for example, 200 μm or less, and may be 100 μm or less. Further, the width of the bottom surface of the unit prism along the arrangement direction of the unit prism can be appropriately adjusted according to the size of the information communication apparatus and the like, and is not particularly limited. The specific width of the bottom of the unit prism is, for example, 10 μm or more. Further, the specific width of the bottom surface of the unit prism is, for example, 200 μm or less, and may be 100 μm or less. The protruding height of the unit prism refers to the distance indicated by symbol H in FIG. 8, and the width of the bottom of the unit prism refers to the distance indicated by symbol W in FIG. 8.

  The arrangement direction of the plurality of unit prisms is preferably such an arrangement direction that can impart a desired light collecting function to the optical functional layer, and is not particularly limited. As described above, in the case where two or more optical functional layers are stacked, for example, as shown in FIG. 9, the arrangement direction of the unit prisms 41 in each of the optical functional layers 4a and 4b is preferably different. It is preferable that each arrangement direction is orthogonal.

  The material of the unit prism is preferably a material that can form a unit prism having a desired light collecting function, and is not particularly limited. Examples of the material of the unit prism include general resin materials. Specifically, ionizing radiation curable resins such as ultraviolet curable resins and electron beam curable resins, thermosetting resins, thermoplastic resins and the like can be mentioned.

  The method of forming the unit prism can be the same as the method of forming a general unit prism, and thus the description thereof is omitted here. In addition, the method disclosed by Unexamined-Japanese-Patent No. 2012-209110 is employable, for example.

  For example, as shown in FIGS. 7 to 9, the unit prism can be configured to have the unit prism 41 on one surface of the main body portion 42. The main body portion can be generally in the form of a flat plate having a constant thickness. The thickness of the main body portion is not particularly limited as long as it can support the unit prism.

  The main body portion preferably has desired light transmittance. For example, the average transmittance of the main body in the visible light range of 380 nm to 720 nm is preferably 50% or more, more preferably 70% or more, and particularly preferably 85% or more. In addition, average transmittance | permeability can be measured in room temperature and air | atmosphere using a ultraviolet spectrophotometer (UV-3100PC, Shimadzu Corp. make).

  As a material of a main-body part, the resin material generally used for an optical function layer is mentioned. Specific examples of the material of the main body portion include ionizing radiation curable resins such as ultraviolet curable resins and electron beam curable resins, thermosetting resins, thermoplastic resins, and the like.

  The method of forming the main body can be the same as the method of forming a general main body, and thus the description thereof is omitted here. In addition, the method disclosed by Unexamined-Japanese-Patent No. 2012-209110 is employable, for example.

(B) Low Reflection Layer The display unit may have a low reflection layer on the side opposite to the light adjustment layer of the printing layer.

  For example, as shown in FIG. 10, the low reflection layer 5 may be provided on the surface of the printing layer 1 opposite to the light adjustment layer 2. In addition, since the code | symbol which is not demonstrated in FIG. 10 can be made to be the same as that of the other FIG. 2 (b) mentioned above, the description here is abbreviate | omitted. By having a low reflective layer as another member, it is possible to suppress the reflection of external light irradiated to the information communication device, and to suppress the decrease in the visibility of the image to be displayed by the display unit.

  The low reflective layer may be disposed on the side opposite to the light control layer of the printing layer, and it is preferable to exhibit the above-described effects. In the display unit, a front protective layer for protecting the display unit may be disposed on the side opposite to the transmission unit of the display unit, that is, on the side of the user using the information communication apparatus. For example, as shown in FIG. 11, the low reflective layer 5 can be disposed on at least one surface of the front surface protective layer 6. The front protective layer can be the same as a general protective layer, and the description thereof is omitted here.

  As described above, the low reflective layer can suppress the reflection of external light emitted to the information communication device, and can suppress the decrease in the visibility of the image to be displayed by the display unit. It is preferably a layer. As a low reflective layer, a light interference layer, a light absorption layer, a light scattering layer etc. are mentioned, for example.

(C) Adhesive Layer The display unit may have an adhesive layer, as needed, between the members constituting the display unit. Among them, in the present disclosure, it is preferable to have a pressure-sensitive adhesive layer excellent in weather resistance.

  It is preferable that it is a material which has a weather resistance as an adhesive used for an adhesion layer. Specific examples of the pressure-sensitive adhesive include pressure-sensitive adhesives such as acrylics, urethanes, silicones, and rubbers. Among them, as the adhesive having weather resistance, for example, it is preferable to use an acrylic adhesive having as a main component a polymer or copolymer of an acrylic monomer such as acrylic acid ester or methacrylic acid ester, particularly n- It is preferable to use butyl acrylate, 2-ethylhexyl acrylate or the like.

  The adhesive layer preferably further contains an ultraviolet absorber. Weather resistance can be improved by containing an ultraviolet absorber. The ultraviolet absorber used in the adhesive layer may be, for example, either an inorganic type or an organic type, and an ultraviolet absorber having a reactive group in the molecule can also be used.

  A generally known method can be mentioned as a method for forming the adhesive layer, and thus the description thereof is omitted.

2. Aspect of B In the display part, a light diffusion plate, an optical functional layer, and a print layer are laminated in order from the side facing the transmission part, and the print layer transmits light that transmits light incident on the display part. , The light diffusion plate has light reflectivity to reflect the light transmitted through the optical functional layer, and the optical functional layer collects the signal light transmitted from the transmitter. It has an optical function.

The display unit will be described with reference to the drawings. As shown in FIGS. 12A and 12B, the display unit 10 has a configuration in which the light diffusion plate 3, the optical function layer 4, and the printing layer 1 are sequentially stacked from the side facing the transmission unit 20. FIGS. 12 (a) and 12 (b) are examples in which the optical functional layer 4 has optical functional layers 4a and 4b in which the arrangement directions of the unit prisms are orthogonal. At this time, the print layer 1 has light transmissivity for transmitting the light h _x incident on the display unit 10, and the light diffusion plate 3 has light reflectivity for reflecting the light transmitted through the optical function layer 4. The optical function layer 4 further has a light collecting function of collecting the signal light h _y transmitted from the transmission unit 20. As a result, even when the illuminance of the external light is high, the intensity of the signal light can be increased more than that, so that the information can be received more favorably by the portable terminal.

  Hereinafter, each configuration of the display unit will be described.

(1) Optical functional layer The optical functional layer is a member disposed between the light diffusion plate and the printing layer. The optical function layer is a member having a light collecting function of collecting the signal light transmitted from the transmitting unit. The detailed description of the optical functional layer can be the same as the contents described in the above-mentioned “Aspect of 1.A. (4) Others (a) Optical functional layer”, so the description is omitted here. .

(2) Light Diffusing Plate The light diffusing plate is a member having light reflectivity that reflects the light transmitted through the light adjustment layer. The detailed description of the light diffusion plate can be the same as the contents described in the section “1.A embodiment (2) light diffusion plate”, and thus the description thereof is omitted here.

(3) Printed Layer The printed layer has light transmissivity to transmit light incident on the display portion. The detailed description of the printing layer can be the same as the contents described in the section “1. A embodiment (3) printing layer”, and thus the description thereof is omitted here.

(4) Others The display unit may have at least the optical functional layer, the light diffusion plate, and the printing layer described above, but may have other layers as necessary. As another layer, a low reflective layer, an adhesion layer, etc. are mentioned, for example. The detailed description of the low reflective layer and the adhesive layer can be the same as the contents described in the section “1. A embodiment (4) Other”, and thus the description thereof is omitted here.

3. Aspect of C A light diffusion plate and a printing layer are laminated in order from the side facing the transmission part in the display part, and the printing layer has light transmissivity to transmit light incident on the display part. The light diffusion plate has light reflectivity to reflect the light transmitted through the printing layer, and has an opening for transmitting a part of the light incident on the display unit.

The display unit will be described with reference to the drawings. As shown in FIGS. 13A and 13B, the display unit 10 has a configuration in which the light diffusion plate 3 and the print layer 1 are stacked in order from the side facing the transmission unit 20. At this time, the print layer 1 has light transmissivity for transmitting the light h _x incident on the display unit 10, and the light diffusion plate 3 a has light reflectivity for reflecting the light transmitted through the print layer 1. Furthermore, the light diffusion plate 3a has an opening 3b for transmitting part of the light h _x incident on the display unit. Therefore, as shown in FIG. 13 (a), with respect to the optical h _x incident on the display unit 10, the light h _x emitted from the display unit 10 is reflected by the light diffusing plate 3, formed on the light diffusing plate 3 The light is attenuated by an amount corresponding to the light transmitted from the opening 3b. On the other hand, as shown in FIG. 13B, since the signal light h _y transmitted from the transmission unit 20 is transmitted through the light diffusion plate 3, the light attenuation effect can be suppressed.

  Hereinafter, each configuration of the display unit will be described.

(1) Light Diffusing Plate The light diffusing plate is a member having light reflectivity that reflects the light transmitted through the light adjustment layer. In addition, the light diffusion plate has an opening for transmitting part of the light incident on the display unit. In addition, since the detailed description about a light diffusing plate can be made to be the same as the content described in the said "1. A aspect (2) light diffusing plate" term, the description here is abbreviate | omitted. In addition, the detailed description of the shape, size, and the like of the opening formed in the light diffusion plate is described in the above-mentioned "1. A embodiment (1) light adjustment layer (b) second embodiment". Since the same as the opening formed in the light shielding layer can be performed, the description here is omitted.

(2) Printed Layer The printed layer has light transmissivity to transmit light incident on the display unit. The detailed description of the printing layer can be the same as the contents described in the section “1. A embodiment (3) printing layer”, and thus the description thereof is omitted here.

(3) Others The display unit may have at least the light diffusion plate and the printing layer described above, but may have other layers as needed. As another layer, a low reflective layer, an adhesion layer, etc. are mentioned, for example. The detailed description of the low reflective layer and the adhesive layer can be the same as the contents described in the section “1. A embodiment (4) Other”, and thus the description thereof is omitted here.

B. Transmission Unit The transmission unit in the present disclosure is a member that has a light source that emits light from the back of the display unit, and transmits information by using the light emitted from the light source as signal light. Further, the signal light transmitted from the transmission unit is received by the portable terminal via the display unit.

  The light source included in the transmission unit has a function of transmitting signal light to the portable terminal. For example, a plurality of LEDs can be used as such a light source.

  In addition, about the specific description about the transmission part in this indication, the Unexamined-Japanese-Patent No. 2016-197552, Unexamined-Japanese-Patent 2014-017581, 2012-128209, and Unexamined-Japanese-Patent 2017-123696 are mentioned, for example. Since the content may be similar to the content disclosed in the like, the description here is omitted.

C. Others In addition to the display unit and the transmission unit described above, the information communication apparatus in the present disclosure may have other configurations as needed. As another configuration of the information communication apparatus, for example, when using the information communication apparatus in a dark environment such as night, a backlight for irradiating a display unit from the back and displaying a predetermined image for the user You may have. As the backlight, a flat array of LEDs can be used. In addition, a control unit for performing various controls of the display unit and the transmission unit can be mentioned. The control unit can be the same as the control unit used in a general information communication apparatus, and thus the description thereof is omitted here. The control unit is, for example, the same as the contents disclosed in, for example, JP-A-2016-197552, JP-A-2014-017581, JP-A-2012-128209, and JP-A-2017-123696. can do.

  The information communication apparatus in the present disclosure can receive the signal light transmitted from the transmission unit by the portable terminal via the display unit. The portable terminal may be any terminal that can receive signal light, and can be selected appropriately according to the signal light. In addition, about a portable terminal, it can be made to be the same as that of the portable terminal described in Unexamined-Japanese-Patent No. 2016-197552, Unexamined-Japanese-Patent No. 2014-017581, and Unexamined-Japanese-Patent No. 2017-123696 etc., for example.

II. Display Unit The display unit of the present disclosure has a light source that emits light, has a transmission unit that transmits information using the light emitted from the light source as signal light, and the signal light transmitted from the transmission unit is A member for use in an information communication apparatus received by a portable terminal, wherein the member displays an image, and a light diffusion plate, a light adjustment layer, and a print layer are sequentially stacked from the side facing the transmission unit. The printing layer has a light transmitting property to transmit light incident on the member, the light diffusing plate has a light reflecting property to reflect the light transmitted through the light adjusting layer, and The adjustment layer is a member having a light attenuating property that attenuates the light incident on the member.

  By using the display unit of the present disclosure for an information communication apparatus, it is possible to achieve better information reception by the portable terminal even in an environment where the illuminance of external light is high. The display unit of the present disclosure can be the same as the contents described in the section “I. Information communication device A. Display unit”, and thus the description thereof is omitted here.

III. Laminate The laminate of the present disclosure has a light source that emits light, has a transmission unit that transmits information using the light emitted from the light source as signal light, and the signal light transmitted from the transmission unit is The display unit is used for a display unit to be used in an information communication apparatus received by a portable terminal, the display unit displays an image, and has a light diffusion plate on the side facing the transmission unit, and the light diffusion plate And a light adjustment layer and a print layer are sequentially stacked from the side opposite to the side facing the transmission unit of the light diffusion plate, having a light reflectivity to reflect incident light, and the print layer is The light transmitting layer has a light transmitting property for transmitting light incident on the display unit, and the light adjusting layer is a member having a light attenuating property for attenuating the light incident on the display unit.

  The laminate of the present disclosure has a configuration in which the light adjustment layer and the print layer are laminated. By using such a laminate for the display unit of the information communication apparatus, it is possible to more favorably receive information by the portable terminal even in an environment where the illuminance of external light is high. The light adjustment layer and the print layer constituting the laminate of the present disclosure can be the same as the contents described in the section “I. Information communication device A. Display” above, Is omitted.

  The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and it has substantially the same configuration as the technical idea described in the claims of the present invention, and any one having the same function and effect can be used. It is included in the technical scope of the invention.

[Reference Example 1]
As shown to Fig.14 (a), the laminated body which laminated | stacked the light adjustment layer 2 and the light diffusing plate 3 was prepared. On the light diffusion plate 3 side of the laminate, an LED box in which LEDs are arranged in parallel is disposed. Moreover, the hololight H was arrange | positioned so that an incident angle might be 60 degrees from the light adjustment layer 2 side of a laminated body. The LED emitted light h _y , and the hololight H emitted light h _x (illuminance: 15000 lx). That is, the light h _x is an external light, and the light h _y is an internal light.
Light Adjustment Layer: As shown in FIGS. 3A and 3B, a laminate of a deflector 21a (thickness: 200 μm) and a λ / 4 plate 21b (thickness: 62 μm) was used. In addition, the film which pinched | interposed the polyvinyl alcohol (PVA) containing iodine between two triacetyl-cellulose (TAC) base materials was used for the deflection | deviation plate 21a. Moreover, the retardation film based on TAC was used for (lambda) / 4 board 21b.
Light diffusion plate: A milky white acrylic resin was used as a material of the light diffusion plate (thickness: 3 mm).

[Reference Example 2]
An experiment was conducted in the same manner as in Reference Example 1 except that an optical functional layer was used instead of the light adjustment layer 2 shown in FIG. 14 (a).
Optical functional layer: As shown in FIGS. 12A and 12B, a laminated layer of optical functional layers 4a and 4b in which the arrangement directions of the unit prisms are orthogonal to each other is used. Each thickness was 155 μm, and a prism sheet obtained by molding an acrylic resin on polyethylene terephthalate (PET) was used as a material.

[Comparative example]
As shown in FIG. 14 (b), it was the same as Reference Example 1 except that the light adjustment layer was not used.

[Evaluation]
FIG. 14 (a), the (b), the distance of 2m from the surface of the laminate was placed the luminance meter L, light h _x, and the luminance was measured at the time of irradiation with the h _y. Further, from the measurement results, the luminance when irradiated with only light h _x, and light h _y only to calculate the ratio of luminance when irradiated, were evaluated for contrast ratio (SN ratio). The results are shown in Table 1. In Table 1, ○ in the case of irradiation, and x in the case of no irradiation.

  From the results of the reference example and the comparative example, it was found that the use of the light adjustment layer or the optical functional layer can suppress the incidence of external light and obtain an excellent contrast ratio.

1 ... printing layer 2 ... light adjustment layer 3 ... light diffusion plate 4 ... optical function layer 5 ... low reflection layer h _x ... light, outside light h _y ... light, inside light, signal light 10 ... display unit 20 ... transmission unit 100 ... Information communication device

Claims (10)

It has a display part which displays an image, and a light source which irradiates light from the back of the display part, and has a transmission part which transmits information by making light irradiated from the light source into signal light, and it transmits from the transmission part The signal light may be received by a portable terminal via the display unit.
In the display unit, a light diffusion plate, a light adjustment layer, and a print layer are sequentially stacked from the side facing the transmission unit,
The print layer is light transmissive to transmit light incident on the display unit.
The light diffusion plate has light reflectivity to reflect light transmitted through the light adjustment layer,
The information communication device, wherein the light adjustment layer has a light attenuating property for attenuating light incident on the display unit.   The information communication device according to claim 1, wherein the light adjustment layer has a polarizing plate and a retardation layer laminated in order from the side facing the print layer. The light adjustment layer includes a light shielding layer containing a light shielding material that shields light incident on the display unit.
The information communication apparatus according to claim 1, wherein the light shielding layer has an opening for transmitting part of light incident on the display unit.   The said display part has an optical function layer provided with the condensing function which condenses the said signal light transmitted from the said transmission part between the said light diffusing plate and the said light adjustment layer. Information communication device. The light adjustment layer has a semi-transmissive layer containing a light shielding material that blocks light incident on the display unit.
The information communication apparatus according to claim 1, wherein the semi-transmissive layer has a semi-transmissive property to semi-transmit light incident on the display unit. It has a display part which displays an image, and a light source which irradiates light from the back of the display part, and has a transmission part which transmits information by making light irradiated from the light source into signal light, and it transmits from the transmission part The signal light may be received by a portable terminal via the display unit.
In the display unit, a light diffusion plate, an optical function layer, and a print layer are stacked in order from the side facing the transmission unit.
The print layer is light transmissive to transmit light incident on the display unit.
The light diffusion plate has light reflectivity to reflect light transmitted through the optical function layer,
The information communication apparatus, wherein the optical function layer includes a condensing function of condensing the signal light transmitted from the transmission unit. It has a display part which displays an image, and a light source which irradiates light from the back of the display part, and has a transmission part which transmits information by making light irradiated from the light source into signal light, and it transmits from the transmission part The signal light may be received by a portable terminal via the display unit.
In the display unit, a light diffusion plate and a print layer are laminated in order from the side facing the transmission unit,
The print layer is light transmissive to transmit light incident on the display unit.
The information communication apparatus, wherein the light diffusion plate has light reflectivity to reflect light transmitted through the print layer, and has an opening for transmitting a part of light incident on the display unit.   The information communication apparatus according to any one of claims 1 to 7, wherein the display unit has a low reflection layer on the side opposite to the light diffusion plate of the print layer. It has a light source which irradiates light, has a transmitting part which transmits information by making light irradiated from the light source into signal light, and the signal light transmitted from the transmitting part is received by a portable terminal, information communication A display unit used in the device,
The display unit displays an image, and a light diffusion plate, a light adjustment layer, and a print layer are sequentially stacked from the side facing the transmission unit,
The print layer is light transmissive to transmit light incident on the display unit.
The light diffusion plate has light reflectivity to reflect light transmitted through the light adjustment layer,
The display unit, wherein the light adjustment layer has a light attenuating property that attenuates light incident on the display unit. It has a light source which irradiates light, has a transmitting part which transmits information by making light irradiated from the light source into signal light, and the signal light transmitted from the transmitting part is received by a portable terminal, information communication Used in the display unit used in the device,
The display unit displays an image, and has a light diffusion plate on the side facing the transmission unit.
The light diffusion plate has light reflectivity to reflect incident light,
A light adjustment layer and a print layer are laminated in order from the side opposite to the side facing the transmission unit of the light diffusion plate,
The print layer is light transmissive to transmit light incident on the display unit.
The laminated body, wherein the light adjustment layer has a light attenuating property for attenuating light incident on the display unit.