WO2015194431A1 - Display device - Google Patents

Abstract

The present invention includes: a display body which is provided with a first surface and a second surface, and in which the first surface and/or the second surface is a display surface; an illumination unit which illuminates the display surface; a detection unit for respectively detecting first detection data based on first light with which the first surface is irradiated from the exterior of the display body, and second detection data based on second light with which the second surface is irradiated from the exterior of the display body; and a control unit which implements, on the basis of the first detection data and the second detection data respectively, control in which the light of the illumination unit is adjusted.

Description

Display device

The present invention relates to a display device.
This application claims priority on June 16, 2014 based on Japanese Patent Application No. 2014-123478 for which it applied to Japan, and uses the content for it here.

As a display device, an independent internally illuminated signboard described in Patent Document 1 is known. This stand-alone internally illuminated signboard controls lighting of an illumination unit based on a lighting time and a dimming pattern for each predetermined month set in advance according to the installation environment.

JP 2014-13276 A

However, since the environmental conditions set in advance do not necessarily match the actual environmental conditions, in Patent Document 1, it is necessary to reset the environmental conditions for each installation location.
By the way, for example, when a display device is installed at a window outside a store facing a road, the display device receives room light from the store side (window side) and sunlight from the side opposite to the store side (road side). Receive the outside light. In this case, since the brightness of outside light and the brightness of room light differ depending on the location, there is a problem that the visibility of the display device is lowered depending on the installation location of the display device.

One embodiment of the present invention has been made to solve the above-described problem, and an object thereof is to provide a display device capable of suppressing a decrease in visibility.

In order to achieve the above object, the present invention employs the following means.
(1) That is, the display device according to the first aspect of the present invention has a first surface and a second surface, and at least one of the first surface and the second surface is a display surface; The illumination unit that illuminates the display surface, the first detection data based on the first light emitted from the outside of the display body and the second surface from outside the display body A detection unit that detects each of the second detection data based on the second light, and a control unit that performs control of dimming the illumination unit based on each of the first detection data and the second detection data; including.

(2) In the display device according to (1), the detection unit receives the first light to generate a first power, and receives the second light to receive a second power. One or a plurality of solar cell elements that generate

(3) In the display device according to (2), the display body includes a light incident surface including the display surface, and a light emission surface having a smaller area than the light incident surface, and the light incidence A light collecting plate for emitting at least a part of the external light incident from the surface from the light emitting surface, and the solar cell element receives the light emitted from the light emitting surface of the light collecting plate to generate electric power. May be.

(4) In the display device according to (3), the light collector absorbs at least a part of external light incident from the light incident surface by one or more optical functional materials, and the one or more light It may be converted into light different from the light absorbed by the functional material and emitted from the light exit surface.

(5) In the display device according to (3) or (4), the solar cell element may be disposed on at least a part of an outer peripheral end surface of the light collector.

(6) In the display device according to (5), the solar cell element is disposed on a part of the outer peripheral end surface of the light collector, and a reflector is formed on the remaining part of the outer peripheral end surface of the light collector. It may be arranged.

(7) In the display device according to any one of (3) to (6), the light collector is opposite to the first light collector on which the first light is incident, and the first light collector. And a second light collector plate on which the second light is incident.

(8) In the display device according to (7), a partition plate that blocks each of the first light and the second light is provided between the first light collector and the second light collector. May be.

(9) In the display device according to (8), at least one of the surface where the partition plate faces the first light collector and the surface where the partition plate faces the second light collector is light-reflective. You may have.

(10) In the display device according to any one of (7) to (9), the number of first solar cell elements arranged on the first light collector is arranged on the second light collector. It may be different from the number of arranged second solar cell elements.

(11) In the display device according to any one of (7) to (10), the first light collector has a first display, and the second light collector has a second display. May be.

(12) In the display device according to (11) above, the first display and the second display may be different from each other.

(13) The display device according to any one of (2) to (12) may further include a power storage unit that stores electric power generated by the solar cell element.

(14) In the display device according to (13), the control unit may perform control to dim the illumination unit based on a remaining amount of power stored in the power storage unit.

(15) In the display device according to (2), the solar cell element has a light receiving surface that directly receives the first light or the second light, and the light receiving surface is the display body. May face in the same direction as the display surface.

(16) In the display device according to (1), (2), or (15), the display body includes a light guide plate having the display surface, and the illumination unit has the display surface of the light guide plate. You may illuminate from the inside.

(17) In the display device according to (16), a display element for displaying an image may be provided inside the light guide plate.

(18) In the display device according to any one of (2) to (14), the display body includes a light incident surface including the display surface, and light emission having a smaller area than the light incident surface. A light-condensing plate that emits at least part of external light incident from the light-incident surface from the light-exiting surface, and the illumination unit is disposed to face the light-condensing plate And a light source disposed on the outer peripheral end surface of the light guide plate.

(19) In the display device according to (1) or (2), the display body is a signboard having the display surface, and the illumination unit may illuminate the display surface from the outside of the signboard. Good.

(20) In the display device according to any one of (1) to (19), the control unit sets the second detection data to a constant value, and based on the first detection data, Control for dimming the illumination unit may be performed.

According to one embodiment of the present invention, a display device capable of suppressing a decrease in visibility can be provided.

It is a perspective view which shows the display apparatus which concerns on 1st embodiment. It is a disassembled perspective view which shows the display apparatus which concerns on 1st embodiment. It is sectional drawing which shows the display apparatus which concerns on 1st embodiment. It is a figure for demonstrating an example of the installation place of the display apparatus which concerns on 1st embodiment, and is a figure which shows the example which installed the display apparatus outside the shop (outside the window). It is a figure for demonstrating an example of the installation place of the display apparatus which concerns on 1st embodiment, and is a figure which shows the example which installed the display apparatus in the inside of a store (the inside of a window). It is sectional drawing which shows the display apparatus which concerns on 2nd embodiment. It is a perspective view which shows the display apparatus which concerns on 3rd embodiment. It is sectional drawing which shows the display apparatus which concerns on 4th embodiment. It is a perspective view which shows the display apparatus which concerns on 5th embodiment. It is sectional drawing which shows the display apparatus which concerns on 6th embodiment. It is a disassembled perspective view which shows the display apparatus which concerns on 7th embodiment. It is sectional drawing which shows the display apparatus which concerns on 8th embodiment. It is a figure which shows the example of application of the display apparatus which concerns on this invention.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4B.
In this embodiment, an example of a so-called stand-alone display device that can operate independently without depending on other devices will be described.
In all of the following drawings, in order to make each component easy to see, the scale of the size may be varied depending on the component.

FIG. 1 is a perspective view showing a display device 1 according to the present embodiment. FIG. 2 is an exploded perspective view showing the display device 1. FIG. 3 is a cross-sectional view showing the display device 1.
As shown in FIGS. 1 to 3, the display device 1 of the present embodiment includes a display body 2, an illumination unit 5, a detection unit 6, a control unit 9, a power storage unit 10, and a first display unit 11. The 2nd display part 12 and the partition plate 13 are provided.

As shown in FIG. 1, the display device 1 has a substantially rectangular parallelepiped outer shape as a whole. On the first display surface 3 a of the display device 1, a first display unit 11 that displays signage (advertisement medium) such as a sign or a sign is provided. On the other hand, as shown in FIGS. 2 and 3, a second display unit 12 that displays the same signage as the first display unit 11 is provided on the second display surface 4 a of the display device 1.

For example, the display device 1 is installed near a window outside a store facing a road. The display device 1 is used as an electronic signboard in a store.
As will be described later, the illumination unit 5 emits light by the power generated by at least one of the first solar cell element 7 and the second solar cell element 8. The illumination unit 5 illuminates each of the first display surface 3a and the second display surface 4a. The control unit 9 performs control of dimming the illumination unit 5 based on the first power generated by the first solar cell element 7 and the second power generated by the second solar cell element 8.

As shown in FIG. 3, the display device 1 is installed such that each of the first display surface 3 a and the second display surface 4 a is along the vertical direction. An observer observes the 1st display part 11 from the same side as the side in which external light L1 (henceforth 1st light), such as sunlight, injects into the display apparatus 1, or the shop side (window side) The second display unit 12 is observed from the same side as the side on which the room light L <b> 2 (hereinafter also referred to as second light) emitted from the light enters the display device 1.
Hereinafter, the side on which the first light L1 is incident on the display device 1 is referred to as “first light incident side”, and the side on which the second light L2 is incident on the display device 1 is referred to as “second light incident side”. Sometimes.

The display body 2 includes a first light collector 3 and a second light collector 4.
The first light collector 3 is disposed on the first light incident side of the display body 2. The first light collector 3 is a plate having a rectangular shape when viewed from the normal direction of the main surface.
Hereinafter, in each drawing, in the state where the main surface of the first light collector 3 is vertically arranged, the thickness direction of the first light collector 3 is set as the X-axis direction, the vertical direction is set as the Z-axis direction, and the first light collector 3 A direction parallel to the main surface and perpendicular to the vertical direction Z is defined as a Y-axis direction. FIG. 3 is a cross-sectional view of the display device 1 taken along the XZ plane at a predetermined position in the Y-axis direction.

As shown in FIG.2 and FIG.3, the 1st light-condensing plate 3 has the 1st surface 3a and 2nd surface 3b as a main surface, and the outer peripheral end surface 3c.
The first surface 3a is the first display surface 3a and is also a first light incident surface on which the first light L1 is incident. Hereinafter, the first light incident surface may be denoted by reference numeral 3a.
The second surface 3b is a surface opposite to the first light incident surface 3a.

The outer peripheral end face 3c has four end faces (first end face 3c1, second end face 3c2, third end face 3c3, and fourth end face 3c4) arranged along the four sides of the first light collector 3.
The first end surface 3c1 is an end surface of the first light collector 3 on the −Z axis direction side. The second end surface 3c2 is an end surface of the first light collector 3 on the + Y axis direction side. The third end surface 3c3 is an end surface of the first light collector 3 on the + Z-axis direction side. The fourth end surface 3c4 is an end surface of the first light collector 3 on the −Y axis direction side.

The outer peripheral end surface 3c has a smaller area than the first light incident surface 3a. The outer peripheral end surface 3c functions as a first light emission surface that emits at least part of the first light L1 incident from the first light incident surface 3a. Hereinafter, the first light exit surface may be denoted by reference numeral 3c. In the present embodiment, a first solar cell element 7 to be described later is disposed on each of the first end surface 3c1, the second end surface 3c2, the third end surface 3c3, and the fourth end surface 3c4 constituting the outer peripheral end surface 3c.

The second light collector 4 is disposed on the second light incident side of the display body 2 so as to face the first light collector 3 with the partition plate 13 interposed therebetween. The second light collector 4 is a plate having substantially the same shape as the first light collector 3.
The second light collector 4 has a first surface 4a, a second surface 4b, and an outer peripheral end surface 4c.
The first surface 4a is the second display surface 4a and also a second light incident surface on which the second light L2 is incident. Hereinafter, the second light incident surface may be denoted by reference numeral 4a.
The second surface 4b is a surface opposite to the second light incident surface 4a.

The outer peripheral end face 4c has four end faces (first end face 4c1, second end face 4c2, third end face 4c3, and fourth end face 4c4) arranged along the four sides of the second light collector 4.
The first end surface 4c1 is an end surface of the second light collector 4 on the −Z axis direction side. The second end surface 4c2 is the end surface of the second light collector 4 on the + Y axis direction side. The third end surface 4c3 is an end surface of the second light collector 4 on the + Z-axis direction side. The fourth end surface 4c4 is an end surface of the second light collector 4 on the −Y axis direction side.
Each of the four end faces 4c1 to 4c4 of the second light collector 4 is disposed on substantially the same plane as each of the four end faces 3c1 to 3c4 of the first light collector 3.

The outer peripheral end surface 4c has a smaller area than the second light incident surface 4a. The outer peripheral end surface 4c functions as a second light emitting surface that emits at least part of the second light L2 incident from the second light incident surface 4a. Hereinafter, the second light exit surface may be denoted by reference numeral 4c. In the present embodiment, a second solar cell element 8 to be described later is disposed on each of the first end surface 4c1, the second end surface 4c2, the third end surface 4c3, and the fourth end surface 4c4 that constitute the outer peripheral end surface 4c.

Each of the 1st light-condensing plate 3 and the 2nd light-condensing plate 4 is a fluorescence light-condensing plate which disperse | distributed fluorescent substance in the transparent base material. The transparent substrate is a plate formed of a transparent resin. Examples of the transparent resin include acrylic resins such as PMMA (polymethyl methacrylate resin), highly transparent organic materials such as polycarbonate resin, and transparent inorganic materials such as glass. As PMMA resin, acrylite (registered trademark) manufactured by Mitsubishi Rayon Co., Ltd. is preferable because it has high translucency for a wide wavelength range.

In this embodiment, PMMA resin (refractive index 1.49) is used as the transparent resin. The light collector 3 is formed by dispersing phosphors in this PMMA resin. The light condensing plate 3 has a refractive index of 1.50, which is about the same as that of the PMMA resin, because the amount of phosphor dispersed is small.

The phosphor is an optical functional material that absorbs ultraviolet light or visible light, emits visible light or infrared light, and emits it. Examples of the optical functional material include organic phosphors.
Such organic phosphors include coumarin dyes, perylene dyes, phthalocyanine dyes, stilbene dyes, cyanine dyes, polyphenylene dyes, xanthene dyes, pyridine dyes, oxazine dyes, chrysene dyes, thioflavine Dyes, perylene dyes, pyrene dyes, anthracene dyes, acridone dyes, acridine dyes, fluorene dyes, terphenyl dyes, ethene dyes, butadiene dyes, hexatriene dyes, oxazole dyes, coumarins Dyes, stilbene dyes, di- and triphenylmethane dyes, thiazole dyes, thiazine dyes, naphthalimide dyes, anthraquinone dyes and the like are preferably used. Specifically, 3- (2′- Benzothiazolyl) -7-diethylaminocoumarin (bear) Phosphorus 6), 3- (2′-Benzimidazolyl) -7-N, N-diethylaminocoumarin (coumarin 7), 3- (2′-N-methylbenzimidazolyl) -7-N, N-diethylaminocoumarin (coumarin 30) , 2,3,5,6-1H, 4H-tetrahydro-8-trifluoromethylquinolidine (9,9a, 1-gh) coumarin (coumarin 153) and the like, and basic coumarin dyes Naphthalimide dyes such as yellow 51, solvent yellow 11 and solvent yellow 116; rhodamine dyes such as rhodamine B, rhodamine 6G, rhodamine 3B, rhodamine 101, rhodamine 110, sulforhodamine, basic violet 11 and basic red 2; 1-ethyl-2- [4- (p-dimethylamino Phenyl) -1,3-butadienyl] pyridinium - perchlorate (pyridine 1) pyridine such as dyes, further, cyanine dyes, or oxazine dyes and the like are used.

An inorganic phosphor can also be used as the phosphor.
Furthermore, various dyes (direct dyes, acid dyes, basic dyes, disperse dyes, etc.) can be used as the phosphor of the present invention as long as they have fluorescence.

In the case of this embodiment, one type of phosphor is dispersed inside each of the first light collector 3 and the second light collector 4. The phosphor absorbs orange light and emits red fluorescence. In this embodiment, BASF's Lumogen R305 (trade name) is used as the phosphor. The phosphor absorbs light having a wavelength of approximately 600 nm or less. The emission spectrum of the phosphor has a peak wavelength at 610 nm.
The first light collector 3 absorbs at least a part of the first light L1 incident from the first light incident surface 3a by the phosphor, converts it into fluorescent light, and emits it from the first light emitting surface 3c. On the other hand, the second light collector 4 absorbs at least a part of the second light L2 incident from the second light incident surface 4a by the phosphor, converts it into fluorescence, and emits it from the second light emitting surface 4c.

In addition, you may use not only the case where 1 type of fluorescent substance is used but multiple types (2 types or 3 types or more) fluorescent substance.
When two or more kinds of phosphors are used in combination, energy transfer is caused between the phosphors by the Forster mechanism, and light emitted from the phosphor having the largest peak wavelength of the emission spectrum is converted into the first solar cell element 7 and The light may be emitted to each of the second solar cell elements 8.

In the Förster mechanism, the excitation energy moves directly between two adjacent phosphors by electron resonance without going through the process of light generation and absorption. Since energy transfer between phosphors by the Förster mechanism is performed without going through the process of light generation and absorption, the energy transfer efficiency can be approximately 100% under optimum conditions, and energy loss is reduced. small. Therefore, it contributes to improvement of each power generation efficiency of the first solar cell element 7 and the second solar cell element 8. In order to efficiently generate power while suppressing energy loss, for example, the density of the phosphor used in combination in the transparent resin may be increased.

In addition, energy transfer by the Forster mechanism occurs not only in a luminescent material such as a phosphor, but also in a non-luminescent material that is excited by external light but deactivates without generating light. Therefore, in addition to the phosphor, such a non-luminous material may be dispersed in the transparent resin as an optical functional material.

The detection unit 6 includes a first solar cell element 7 and a second solar cell element 8.
The light receiving surface 7 a of the first solar cell element 7 is in contact with the first light exit surface 3 c of the first light collector 3. The first solar cell element 7 receives light emitted from the first light exit surface 3 c of the first light collector 3 and generates first power.
On the other hand, the light receiving surface 8 a of the second solar cell element 8 is in contact with the second light exit surface 4 c of the second light collector 4. The second solar cell element 8 receives light emitted from the second light exit surface 4c of the second light collector 4 and generates second power.
The detection unit 6 detects the first power as the first detection data based on the first light L <b> 1 irradiated to the first light incident surface 3 a from the outside of the display body 2, and the second from the outside of the display body 2. Second power is detected as second detection data based on the second light L2 irradiated to the light incident surface 4a.

As the 1st solar cell element 7 and the 2nd solar cell element 8, well-known solar cells, such as a silicon type solar cell, a compound type solar cell, a quantum dot solar cell, and an organic type solar cell, can be used. Especially, the compound type solar cell and quantum dot solar cell using a compound semiconductor are suitable as the 1st solar cell element 7 and the 2nd solar cell element 8 since highly efficient electric power generation is possible. In particular, a GaAs solar cell that is a compound solar cell exhibiting high efficiency at the peak wavelength (610 nm) of the emission spectrum of the phosphor is desirable. In addition, InGaP, InGaAs, AlGaAs, Cu (In, Ga) Se ₂ , Cu (In, Ga) (Se, S) ₂ , CuInS ₂ , CdTe, CdS, or the like may be used as the compound solar cell. . Further, Si, InGaAs or the like may be used as the quantum dot solar cell. However, other types of solar cells such as Si and organic can be used depending on the price and application.

Each of the first solar cell element 7 and the second solar cell element 8 is bonded to the first light exit surface 3c of the first light collector 3 and the second light exit surface 4c of the second light collector 4 with a transparent adhesive. Is done.
The transparent adhesive is preferably a thermosetting adhesive such as an ethylene / vinyl acetate copolymer (EVA), an epoxy adhesive, a silicone adhesive, or a polyimide adhesive. The refractive index of the transparent adhesive is 1.50, which is the same as that of each of the first light collector 3 and the second light collector 4. A liquid or gel optical contact material may be used instead of the transparent adhesive. For example, the optical contact material has transparency such as an optical oil (immersion oil: refractive index 1.51) used for an optical microscope having an immersion lens, and the first light collector 3 and the second light collector. 4 may be a material having substantially the same refractive index as each of 4.

The partition plate 13 is provided between the first light collector 3 and the second light collector 4. The upper and lower end surfaces of the partition plate 13 are arranged on substantially the same plane as the upper and lower end surfaces of the first solar cell element 7 and the second solar cell element 8, respectively. The partition plate 13 includes a first partition surface 13a that faces the first light collector 3 and a second partition surface 13b that faces the second light collector 4 on the side opposite to the first partition surface 13a. Each of the first partition surface 13a and the second partition surface 13b of the partition plate 13 has light reflectivity.

As the partition plate 13, a plate body in which a reflection layer made of a dielectric multilayer film such as an ESR (Enhanced Specular Reflector) reflection film (manufactured by 3M) is formed on both sides of the first partition surface 13 a and the second partition surface 13 b is used. be able to. If this material is used as the reflective layer, a high reflectance of 98% or more can be realized under visible light.
A reflective plate may be used as the partition plate 13. Examples of the reflecting plate include metal plates such as aluminum (Al), copper (Cu), gold (Au), and silver (Ag). Further, as the reflecting plate, a material having diffuse reflectivity such as micro foamed PET (polyethylene terephthalate) manufactured by Furukawa Electric may be used.

Each of the control unit 9 and the power storage unit 10 is provided on the lower end side of the display body 2. Each of the control unit 9 and the power storage unit 10 is arranged adjacently in this order from the + Y-axis direction side. Each of the control unit 9 and the power storage unit 10 is bonded to the respective lower ends (ends in the −Z-axis direction) of the first solar cell element 7, the partition plate 13, and the second solar cell element 8 with an adhesive. As the adhesive, the adhesive used in the first solar cell element 7 and the like described above may be used.
In addition, each of the control part 9 and the electrical storage part 10 does not need to be joined to each lower end of the 1st solar cell element 7, the partition plate 13, and the 2nd solar cell element 8 with an adhesive agent. For example, the first solar cell element 7, the partition plate 13, and the second solar cell element 8 may be detachably disposed on the upper surfaces (the surfaces in the + Z-axis direction) of the control unit 9 and the power storage unit 10. . Thereby, each of the control part 9 and the electrical storage part 10 can be removed as needed.

The control unit 9 performs control for dimming the illumination unit 5 based on each of the first power and the second power.
The power storage unit 10 stores the electric power generated by the first solar cell element 7 and the second solar cell element 8.
Although not shown, the display device 1 is provided with various circuits such as a charging circuit and a lighting circuit.
The charging circuit charges the power storage unit 10 with the electric power generated by the first solar cell element 7 and the second solar cell element 8.
The lighting circuit lights the lighting unit 5 with the electric power stored in the power storage unit 10.

In addition, the control unit 9 performs control for dimming the illumination unit 5 based on the remaining amount of power stored in the power storage unit 10. For example, when the remaining amount of electric power stored in the power storage unit 10 is equal to or greater than a predetermined value, the control unit 9 turns on the illumination unit 5 with relatively high brightness or turns on with normal brightness. . On the other hand, when the remaining amount of power stored in the power storage unit 10 is less than a predetermined value, the control unit 9 turns on or turns off the illumination unit 5 with relatively small brightness.

The illumination unit 5 is provided on the upper end side of the display body 2. The illumination unit 5 emits light by the electric power generated by the first solar cell element 7 and the second solar cell element 8, the electric power stored by the power storage unit 10, or the like.
Note that the illumination unit 5 may emit light by power supplied from an external power source.
The width of the illumination unit 5 in the X-axis direction is longer than the width of the display body 2 in the X-axis direction. The central portion in the X-axis direction of the illumination unit 5 is joined to the upper ends (+ Z-axis direction ends) of the first solar cell element 7, the partition plate 13, and the second solar cell element 8 with an adhesive. As the adhesive, the adhesive used in the first solar cell element 7 and the like described above may be used.

As the illumination unit 5, a light source for illumination such as a fluorescent lamp or LED (Light Emitting Diode) can be used. The illumination unit 5 includes a light emitting surface 5 a that emits light toward the first display unit 11 and the second display unit 12. The light emitting surface 5 a is formed on the lower surface of the illumination unit 5. In addition, the light emission surface 5a should just be formed in the lower surface of the part (X-axis direction both ends of the illumination part 5) longer than the display body 2 in the X-axis direction among the illumination parts 5. FIG.

In the first display unit 11, a layer including a scatterer such as light scattering particles is formed on the first display surface 3 a of the first light collector 3. The first display unit 11 has a first display.
The second display unit 12 is formed by forming the same layer as the first display unit 11 on the second display surface 4 a of the second light collector 4. The second display unit 12 has a second display different from the first display.
The display portions 11 and 12 may be formed by applying fine irregularities to the display surfaces 3a and 4a of the first light collector 3 and the second light collector 4 by sandblasting or the like. The first display and the second display may be the same.

Hereinafter, an example of the method of the light control by the control part 9 which concerns on this embodiment is demonstrated.
The following method is mentioned as a 1st method.
The power (first illumination power Ws1) generated by the first solar cell element 7 by receiving only the illumination light emitted from the illumination unit 5 is set in advance. Similarly, the power (second illumination power Ws2) generated by the second solar cell element 8 by receiving only the illumination light is set.
The control unit 9 sets a value obtained by subtracting the first illumination power Ws1 from the power Wt1 (total power) generated by the first solar cell element 7 as the first power W1 (W1 = Wt1−Ws1). Further, the control unit 9 sets a value obtained by subtracting the second illumination power Ws2 from the power Wt2 (total power) generated by the second solar cell element 8 as the second power W2 (W2 = Wt2−Ws2). And the control part 9 performs control which dimmes the illumination part 5 based on each of the 1st electric power W1 and the 2nd electric power W2.

According to the first method, even if the first solar cell element 7 generates power by receiving illumination light in addition to the first light L1, the first illumination power is calculated from the total power of the first solar cell element 7. Since Ws1 is excluded, the power based on the first light L1 can be obtained as the first power W1. Even if the second solar cell element 8 receives the illumination light in addition to the second light L2 and generates power, the second illumination power Ws1 is removed from the total power of the second solar cell element 8, Electric power based on the second light L2 can be obtained as the second electric power W2. Therefore, each detection precision of the 1st electric power W1 and the 2nd electric power W2 can be improved.

The following method is mentioned as a 2nd method.
A flashing light source is used as the illumination unit 5. When the illumination unit 5 is not lit (when OFF), the control unit 9 sets the power generated by the first solar cell element 7 as the first power and the power generated by the second solar cell element 8. The second power. And the control part 9 performs control which dimmes the illumination part 5 based on each of 1st electric power and 2nd electric power obtained when the illumination part 5 is not lighting.

According to the second method, the power obtained when the illumination unit 5 is lit is not included in each of the first power and the second power. Therefore, the power based only on the first light L1 can be obtained as the first power, and the power based only on the second light L2 can be obtained as the second power. Therefore, the detection accuracy of each of the first power and the second power can be increased.

Hereinafter, the operation of the display device 1 according to the present embodiment will be described with reference to FIG. 3, FIG. 4A, FIG. 4B, and Table 1.
4A and 4B are diagrams for explaining an example of an installation location of the display device 1. FIG. 4A is a diagram illustrating an example in which the display device 1 is installed outside the store 100 (outside the window 101). FIG. 4B is a diagram illustrating an example in which the display device 1 is installed in the store 100 (inside the window 101).
As shown in FIG. 3, FIG. 4A, and FIG. 4B, for example, at night, the display device 1 is oriented so that the second display surface 4 a faces the store 100 and the first display surface 3 a faces the opposite side of the store 100. Consider the case where it is installed. The observer observes the first display unit 11 from outside the store 100.

In FIG. 4A and FIG. 4B, for example, a place away from the store 100 where the room light is hardly received from the window 101 of the store 100 is defined as the first installation location P1. Further, a place outside the upper part of the window 101 where the room light is directly received from the window 101 of the store 100 is defined as a second installation place P2. Further, a place outside the lower part of the window 101 where the room light is slightly received from the window 101 of the store 100 (a place that becomes a shadow of the shelf 102) is defined as a third installation place P3. Further, a place inside the upper part of the window 101 that directly receives the indoor light of the store 100 is set as a fourth installation place P4.
For example, the window 101 is formed of a transparent plate material such as glass.

As shown in FIGS. 3, 4 </ b> A, and 4 </ b> B, when the display device 1 is installed at the first installation location P <b> 1, the periphery of the display device 1 is dark because it is nighttime, and the brightness of the illumination unit 5 is reduced. Even so, the first display unit 11 can be viewed from outside the store 100.
However, when the display device 1 is installed at the second installation location P2 or the fourth installation location P4, the display device 1 receives room light directly from the window 101 of the store 100, so that the brightness of the illumination unit 5 is reduced to the room light. If it is not larger than brightness, it will become difficult to visually recognize the 1st display part 11. FIG.
When the display device 1 is installed at the third installation location P3, the display device 1 becomes a shadow of the shelf 102. Even in this case, the display device 1 receives a lot of room light from the window 101 of the store 100. Therefore, it is difficult to visually recognize the first display unit 11 unless the brightness of the illumination unit 5 is made larger than the brightness of the room light.

If a general display device is placed at the installation location, the periphery of the display device becomes dark or the display device receives room light from the window 101 of the store 100. Thus, since the brightness of room light changes with installation locations P1, P2, P3, and P4, the visibility of a display part will fall depending on the installation location of a display apparatus.
On the other hand, in this embodiment, since the control part 9 performs control which dimmes the illumination part 5 based on each of 1st electric power and 2nd electric power, the display apparatus 1 is installed in the installation place P1, The first display unit 11 can be clearly visually recognized regardless of which of P2, P3, and P4.

An example of dimming control of the illumination unit 5 by the control unit 9 is shown in Table 1.
Hereinafter, the case where the display apparatus 1 is installed outdoors will be described (see FIGS. 3 and 4A). Specifically, the display device 1 is placed outside the store 100 during the day or at night (outside), the second display surface 4a faces the store 100 side, and the first display surface 3a faces away from the store 100. This is the case when it is installed to face. Further, the observer observes the first display unit 11 from the opposite side to the store 100 outdoors.

In Table 1, the following criteria were set for each column of brightness of the installation location (outdoor) and indoor brightness. In addition, the brightness of an installation place (outdoor) is based on the 1st electric power which the 1st solar cell element 7 receives and receives external light (1st light L1). The indoor brightness is based on the second electric power generated when the second solar cell element 8 receives indoor light (second light L2).
“◯” in the brightness column of the installation location (outdoor): a state in which external light (first light L1) is incident on the first display surface 3a of the display device 1, that is, daytime.
“X” in the brightness column of the installation location (outdoor): a state in which outside light (first light L1) does not enter the first display surface 3a of the display device 1, that is, at night.
“◯” in the indoor brightness column: a state in which room light (second light L2) is incident on the second display surface 4a of the display device 1, that is, a case where the illumination of the store 100 is turned on.
“X” in the indoor brightness column: a state in which room light (second light L2) does not enter the second display surface 4a of the display device 1, that is, a case where the illumination of the store 100 is turned off.

As shown in Table 1, when the brightness of the installation location (outdoor) is “x” and the indoor brightness is “x”, that is, when the illumination of the store 100 is turned off at night, the display device 1 Since the surrounding area is dark, the first display unit 11 can be visually recognized outdoors even if the brightness of the illumination unit 5 is reduced.
Further, when the brightness of the installation location (outdoor) is “◯” and the indoor brightness is “X”, that is, when the illumination of the store 100 is turned off in the daytime, the display device 1 is bright. Even if the illumination unit 5 is turned off, the first display unit 11 can be visually recognized outdoors.
When the brightness of the installation location (outdoor) is “×” and the indoor brightness is “◯”, that is, when the illumination of the store 100 is lit at night, the brightness of the illumination unit 5 is set indoors. By making it brighter than the brightness of the first display unit 11 can be easily visually recognized outdoors.
Further, when the brightness of the installation location (outdoor) is “◯” and the indoor brightness is “◯”, that is, when the illumination of the store 100 is lit in the daytime, the first power and the second power By comparing the electric power and dimming the illumination unit 5, the first display unit 11 can be easily visually recognized outdoors.

The control unit 9 performs control for dimming the illumination unit 5 based on each of the first power as the first detection data and the second power as the second detection data.
Moreover, the control part 9 can also perform control which makes the 2nd electric power as 2nd detection data a fixed value, and adjusts the illumination part 5 based on the 1st electric power as 1st detection data. . Control in which the second power is set to a constant value can be applied when the second light L2 can be almost ignored, for example, when the lighting of the store 100 is turned off.
By the dimming control by the control unit 9, for example, the illumination unit 5 can be turned on so that the display units 11 and 12 can be easily seen even in a dark place. In addition, by the dimming control by the control unit 9, the illumination unit 5 is provided so that each of the first display unit 11 and the second display unit 12 is easily visible even in an environment where another light source is present around the display device 1. Can be lit.

As described above, according to the display device 1 according to the present embodiment, the control unit 9 performs control for dimming the illumination unit 5 based on each of the first power and the second power. Even if the display device 1 is installed in an environment in which the height varies, each of the first display unit 11 and the second display unit 12 can be appropriately illuminated. Accordingly, it is possible to suppress a decrease in the visibility of the display device 1.
Moreover, since the illumination part 5 can be light-modulated to required brightness suitably, it is suppressed that electric power is consumed more than necessary.
Moreover, since it is suppressed that the illumination part 5 is lighted excessively, the illumination part 5 can be used long (life extension).
Further, for example, when an observer approaches the display device 1 in the daytime, a shadow may be generated on the first display unit 11 or the second display unit 12. Even in this case, since the dimming control corresponding to the fluctuation of the surrounding brightness due to the shadow of the observer is performed by the control unit 9, the visibility of each of the first display unit 11 and the second display unit 12 is reduced. Can be suppressed.
Further, even when a weather change such as sunny weather or rainy weather occurs, the dimming control corresponding to the weather change is performed by the control unit 9, so that the visibility of each of the first display unit 11 and the second display unit 12 is achieved. Can be suppressed.

Moreover, according to this structure, since the detection part 6 is equipped with the 1st solar cell element 7 and the 2nd solar cell element 8, receiving 1st light L1 and 2nd light L2, and generating electric power, Each of the first detection data and the second detection data can be detected. Therefore, it is possible to secure electric power for illuminating the illumination unit 5 in a dark place, and it is possible to secure detection data for use in dimming control by the control unit 9.
Moreover, since the 1st solar cell element 7 and the 2nd solar cell element 8 function as a power supply source to the illumination part 5, the illumination part 5 can be light-emitted without using external power supplies, such as an outlet socket.
Moreover, since the 1st solar cell element 77 and the 2nd solar cell element 8 function also as a sensor, it is not necessary to provide an illumination intensity sensor etc. separately. Therefore, the display device 1 can be applied as a stand-alone display device.

Further, according to this configuration, since the fluorescent light collecting plate is used as the first light collecting plate 3 and the second light collecting plate 4, the first light incident on each of the first light collecting plate 3 and the second light collecting plate 4. Each of the light L1 and the second light L2 is absorbed to generate fluorescence. Then, the fluorescence propagates through the first light collector 3 and the second light collector 4 and is guided to the first solar cell element 7 and the second solar cell element 8, respectively. Therefore, the incident angle of the first light L1 with respect to the first light incident surface 3a of the first light collector 3 changes, or the incident angle of the second light L2 with respect to the second light incident surface 4a of the second light collector 4 changes. Even if it changes, the power generation efficiency can be maintained.

Further, according to this configuration, the first solar cell element 7 and the second solar cell element 8 are respectively disposed on the outer peripheral end surface 3 c of the first light collector 3 and the outer peripheral end surface 4 c of the second light collector 4. Therefore, the fluorescence propagating through the first light collector 3 and the second light collector 4 can be received by the first solar cell element 7 and the second solar cell element 8 without leakage. Therefore, the power generation efficiency can be further improved.

Further, according to this configuration, since the display body 2 includes the first light collector 3 and the second light collector 4, the first light L1 is transmitted to the first light L1 as compared with the case where the display body 2 includes one light collector. It is easy to use the second light L2 for the second power.

Further, according to this configuration, since the partition plate 13 is provided between the first light collector 3 and the second light collector 4, each of the first light L1 and the second light L2 is blocked by the partition plate 13. It is done. Therefore, the first light L1 is prevented from entering the second light collector 4 and the second light L2 is prevented from entering the first light collector 3. Therefore, the detection accuracy of each of the first detection data and the second detection data can be increased.
Moreover, the visibility of each of the first display unit 11 and the second display unit 12 can be maintained.

Further, according to this configuration, since the partition plate 13 has light reflectivity, the light incident on the partition plate 13 (for example, the first light L1, the second light L2, fluorescence, etc.) is reflected by the partition plate 13. Is done. Therefore, the light reflected by the partition plate 13 propagates through the first light collector 3 and the second light collector 4 and is guided to the first solar cell element 7 and the second solar cell element 8, respectively. Therefore, the power generation efficiency can be further improved.

Further, according to this configuration, the first light collector 3 has the first display 11 as the first display, and the second light collector 4 has the second display 12 as the second display. The display can be visually recognized on each of the first display surface 3a side and the second display surface 4a side.

Further, according to this configuration, since the first display and the second display are different, different displays can be visually recognized on the first display surface 3a side and the second display surface 4a side of the display device 1.

Further, according to this configuration, since at least one of the first solar cell element 7 and the second solar cell element 8 has the power storage unit 10 that stores the generated power, the lighting unit 5 is turned on with the power stored in the power storage unit 10. can do. For example, the display device 1 can be used as a signboard even at night or on rainy days.

Moreover, according to this structure, since the control part 9 performs control which dimmes the illumination part 5 based on the residual amount of the electric power stored in the electrical storage part 10, it is suppressed that electric power is consumed more than necessary. Therefore, energy saving can be achieved.
For example, the control unit 9 basically performs control for dimming the illumination unit 5 based on each of the first power and the second power, and based on the remaining amount of power stored in the power storage unit 10. Control for dimming the illumination unit 5 is performed. When the remaining amount of power stored in the power storage unit 10 is equal to or greater than a predetermined value, the control unit 9 turns on the illumination unit 5 with relatively high brightness or with normal brightness. On the other hand, when the remaining amount of power stored in the power storage unit 10 is less than a predetermined value, the control unit 9 turns on or turns off the illumination unit 5 with relatively small brightness.

Further, according to this configuration, the control unit 9 sets the second power as the second detection data to a constant value, and controls the dimming unit 5 based on the first power as the first detection data. Therefore, the dimming control of the illumination unit 5 by the control unit 9 can be simplified as necessary.

In the present embodiment, the first light collecting plate 3 and the second light collecting plate 4 have been described using an example in which a fluorescent light collecting plate in which a phosphor is dispersed in a transparent base material is used. However, the present invention is not limited thereto. For example, as the first light collecting plate 3 and the second light collecting plate 4, a reflecting surface that reflects incident light and changes the traveling direction of the light is provided on a surface (second surface) opposite to the light incident surface. A concentrating plate having a different shape may be used.
Further, as the first light collector 3 and the second light collector 4, a fluorescent light collector and a shape light collector may be used in combination.

[Second Embodiment]
FIG. 5 is a cross-sectional view showing the display device 21 according to the second embodiment.
As shown in FIG. 5, the basic configuration of the display device 21 according to this embodiment is the same as that of the first embodiment, and is different from the first embodiment in that the display body 22 includes one light collector 3. Therefore, in this embodiment, the same code | symbol is attached | subjected to the structure same as 1st embodiment, and description of the basic composition of the display apparatus 21 is abbreviate | omitted.

The display device 21 includes a display body 22, an illumination unit 5, a detection unit 26, a control unit 9, a power storage unit 10, and a first display unit 11. The display device 21 does not include the second display unit 12 according to the first embodiment and the partition plate 13.
The light collector 3 constituting the display body 22 corresponds to the first light collector 3 according to the first embodiment. That is, the display body 22 does not include the second light collector 4 according to the first embodiment.

The solar cell element 7 constituting the detection unit 26 corresponds to the first solar cell element 7 according to the first embodiment. That is, the detection unit 26 does not include the second solar cell element 8 according to the first embodiment.
The detection unit 26 detects the first power as the first detection data based on the first light L1 irradiated to the first light incident surface 3a from the outside of the display body 22, and also detects the second power from the outside of the display body 22. The second power is detected as second detection data based on the second light L2 irradiated to the surface 3b. The control unit 9 controls the lighting unit 5 to be dimmed based on the second power as the second detection data at a constant value and the first power as the first detection data.

As described above, according to the display device 21 in the present embodiment, since the display body 22 includes the single light collector 3, the configuration of the display device 21 can be simplified.
Further, when the second light L2 hardly fluctuates, such as when the store lighting is lit for 24 hours, it can be considered that only the first light L1 fluctuates. In this case, the control unit 9 can set the second power as the second detection data to a constant value, and can control the dimming unit 5 based on the first power as the first detection data. . Therefore, dimming control of the illumination unit 5 by the control unit 9 can be simplified.

[Third embodiment]
FIG. 6 is a perspective view showing a display device 31 according to the third embodiment.
As shown in FIG. 6, the basic configuration of the display device 31 according to the present embodiment is the same as that of the first embodiment, the display body 32 includes a light guide plate 33 having a display surface 33 a, and the solar cell element 37. The difference from the first embodiment is that one light receiving surface 37a faces the same direction as the display surface 33a. Therefore, in this embodiment, the same code | symbol is attached | subjected to the structure same as 1st embodiment, and description of the basic composition of the display apparatus 31 is abbreviate | omitted.

The display device 31 includes a display body 32, an illumination unit 5, a detection unit 36, a control unit 9, a power storage unit 10, and a first display unit 11.
The display body 32 includes a light guide plate 33 having a display surface 33a. The first display unit 11 is disposed on the display surface 33a.
The light guide plate 33 is a plate having a rectangular planar shape when viewed from the normal direction of the main surface. The light guide plate 33 is a transparent substrate having optical transparency. As a material for forming the transparent substrate, glass or plastic material is used. Examples of the plastic material include acrylic resin, polycarbonate resin, and cycloolefin resin (COP).

The illumination unit 5 is provided at the upper end (+ Z-axis direction end) of the light guide plate 33. The illumination unit 5 illuminates the display surface 33 a from the inside of the light guide plate 33.
The illumination unit 5 is joined to the upper end of the light guide plate 33 by an adhesive. As the adhesive, the adhesive used in the first solar cell element 7 according to the first embodiment described above may be used.

The detection unit 36 includes a solar cell element 37.
The solar cell element 37 is provided on the upper end side of the display body 32. The solar cell element 37 is joined to the upper end (+ Z-axis direction end) of the illumination unit 5 with the above-described adhesive or the like.

The solar cell element 37 has a first light receiving surface 37a that directly receives the first light L1 and a second light receiving surface 37b that directly receives the second light L2.
The first light receiving surface 37a is arranged to face the same direction (−X axis direction) as the display surface 33a.
The second light receiving surface 37b is disposed to face in the opposite direction (+ X axis direction) to the first light receiving surface 37a.

As described above, according to the display device 31 in the present embodiment, the solar cell element 37 directly receives the first light L1 and the second light L2. Therefore, compared with the structure which a solar cell element receives each of the 1st light L1 and the 2nd light L2 indirectly through a transparent member etc., the improvement in electric power generation efficiency can be aimed at. Moreover, since the 1st light-receiving surface 37a faces the same direction as the display surface 33a, the appearance of the display apparatus 1 improves.

In addition, according to this configuration, since the illumination unit 5 illuminates the display surface 33 a from the inside of the light guide plate 33, the light propagating through the light guide plate 33 can contribute to the illumination of the first display unit 11. Therefore, compared with the case where the 1st display part 11 is illuminated from the outside, the 1st display part 11 can be illuminated brightly. Therefore, the visibility of the first display unit 11 can be improved.

[Fourth embodiment]
FIG. 7 is a perspective view showing a display device 41 according to the fourth embodiment.
As shown in FIG. 7, the basic configuration of the display device 41 according to this embodiment is the same as that of the third embodiment, and the third embodiment is that a display element 42a for displaying an image is provided inside the light guide plate 43. Different from form. Therefore, in the present embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and the description of the basic configuration of the display device 41 is omitted.

The display device 41 includes a display body 42, an illumination unit 5, a detection unit 36, a control unit 9, a power storage unit 10, and a display element 42a.
The display body 42 includes a light guide plate 43 having a display surface 43a. The light guide plate 43 is a plate having a rectangular shape when viewed from the normal direction of the main surface. The light guide plate 43 is a transparent substrate having optical transparency. As the forming material of the transparent substrate, the same forming material as that of the light guide plate 33 according to the third embodiment described above may be used.

On the display surface 43a side of the light guide plate 43, a rectangular recess 43b that is recessed in the thickness direction (+ X axis direction) is formed. The display element 42a has a rectangular outline substantially the same size as the recess 43b. A display element 42a such as a liquid crystal panel is fitted in the recess 43b. Thereby, the display element 42 a is provided inside the light guide plate 43.

As described above, according to the display device 41 in the present embodiment, the display element 42a is provided inside the light guide plate 43, so that light propagating through the light guide plate 43 can contribute to illumination of the display element 42a. . Therefore, the display element 42a can be illuminated more brightly than when the display element 42a is illuminated from the outside. Therefore, the visibility of the display element 42a can be improved.
Further, the light guide plate 43 can be used as a base for the display element 42a.

[Fifth embodiment]
FIG. 8 is a perspective view showing a display device 51 according to the fifth embodiment.
As shown in FIG. 8, the basic configuration of the display device 51 according to this embodiment is the same as that of the second embodiment, and the second embodiment is that a display element 42 a for displaying an image is provided inside the light collector 53. Different from form. Therefore, in this embodiment, the same code | symbol is attached | subjected to the structure same as 2nd embodiment, and description of the basic composition of the display apparatus 51 is abbreviate | omitted.

The display device 51 includes a display body 52, an illumination unit 5, a detection unit 26, a control unit 9, a power storage unit 10, and a display element 42a.
The display body 52 includes a light collector 53 having a display surface 53a. The light collector 53 is a fluorescent light collector similar to the light collector 3 according to the second embodiment.

On the display surface 53a side of the light collector 53, a rectangular recess 53b that is recessed in the thickness direction (+ X-axis direction) is formed. The display element 42a has a rectangular outline substantially the same size as the recess 53b. A display element 42a such as a liquid crystal panel is fitted in the recess 53b. Thereby, the display element 42 a is provided inside the light collector 53.

As described above, according to the display device 51 in the present embodiment, the display element 42a is provided inside the light collector 53, and therefore, the light collector 53 can be used as a base for the display element 42a.

[Sixth embodiment]
FIG. 9 is a cross-sectional view showing a display device 61 according to the sixth embodiment.
As shown in FIG. 9, the basic configuration of the display device 61 according to this embodiment is the same as that of the first embodiment, and is different from the first embodiment in that the illumination unit 62 includes a light guide plate and a light source. Therefore, in this embodiment, the same code | symbol is attached | subjected to the structure same as 1st embodiment, and description of the basic composition of the display apparatus 61 is abbreviate | omitted.

The display device 61 includes the display body 2, the illumination unit 62, the detection unit 6, the control unit 9, the power storage unit 10, the first display unit 11, the second display unit 12, the partition plate 13, and the ceiling. A plate 60.
The illumination unit 62 includes a first illumination unit 63 and a second illumination unit 64.

The first illumination unit 63 is disposed on the first light incident side of the display body 2. The first illumination unit 63 includes a first light guide plate 65 and a first light source 67.
The first light guide plate 65 is a plate having a rectangular shape when viewed from the normal direction of the main surface.

The first light guide plate 65 is disposed to face the first light collector 3. The first light guide plate 65 has a first surface 65a and a second surface 65b as main surfaces, and an outer peripheral end surface 65c.
The second surface 65b is a surface opposite to the first surface 65a.
The first display portion 11 is provided on the first surface 65 a of the first light guide plate 65. The second surface 65 b of the first light guide plate 65 is in contact with the first light incident surface 3 a of the first light collector 3.

The outer peripheral end face 65c has four end faces (first end face 65c1, second end face 65c2, third end face 65c3, and fourth end face 65c4) arranged along the four sides of the first light guide plate 65.
The first end surface 65c1 is an end surface of the first light guide plate 65 on the −Z axis direction side. The second end face 65c2 (not shown) is an end face on the + Y axis direction side of the first light guide plate 65. The third end surface 65c3 is an end surface of the first light guide plate 65 on the + Z-axis direction side. The fourth end face 65c4 (not shown) is an end face on the −Y axis direction side of the first light guide plate 65.
Each of the four end faces 65c1 to 65c4 of the first light guide plate 65 is adjacent to each of the four end faces 3c1 to 3c4 of the first light collector 3 on substantially the same plane.
A first light source 67, which will be described later, is disposed on each of the first end surface 65c1 and the third end surface 65c3 constituting the outer peripheral end surface 65c.

The second illumination unit 64 is disposed on the second light incident side of the display body 2. The second illumination unit 64 includes a second light guide plate 66 and a second light source 68.
The second light guide plate 66 is a plate body having substantially the same shape as the first light guide plate 65.

The second light guide plate 66 is disposed to face the second light collector 4.
The second light guide plate 66 has a first surface 66a, a second surface 66b, and an outer peripheral end surface 66c.
The second surface 66b is a surface opposite to the first surface 66a.
The second display unit 12 is provided on the first surface 66 a of the second light guide plate 66. The second surface 66 b of the second light guide plate 66 is in contact with the second light incident surface 4 a of the second light collector 4.

The outer peripheral end surface 66c has four end surfaces (first end surface 66c1, second end surface 66c2, third end surface 66c3, and fourth end surface 66c4) arranged along the four sides of the second light guide plate 66.
The first end surface 66c1 is an end surface of the second light guide plate 66 on the −Z axis direction side. The second end surface 66c2 is an end surface of the second light guide plate 66 on the + Y axis direction side. The third end surface 66c3 is an end surface of the second light guide plate 66 on the + Z-axis direction side. The fourth end surface 66c4 is an end surface of the second light guide plate 66 on the −Y axis direction side.
Each of the four end faces 66c1 to 66c4 of the second light guide plate 66 is adjacent to each of the four end faces 4c1 to 4c4 of the second light collector 4 on substantially the same plane.
A second light source 68, which will be described later, is disposed on each of the first end surface 66c1 and the third end surface 66c3 constituting the outer peripheral end surface 66c.

Each of the first light guide plate 65 and the second light guide plate 66 is a transparent substrate having optical transparency.
As the forming material of the transparent substrate, the same forming material as that of the light guide plate 33 according to the third embodiment described above may be used.

The first light source 67 is provided at each of the upper and lower ends of the first light guide plate 65. The first light source 67 has a light emitting surface 67 a that emits light toward the first light guide plate 65. The light emitting surface 67 a of the first light source 67 provided at the lower end of the first light guide plate 65 is in contact with the first end surface 65 c 1 of the first light guide plate 65.
The light emitting surface 67 a of the first light source 67 provided at the upper end of the first light guide plate 65 is in contact with the third end surface 65 c 3 of the first light guide plate 65. The first light source 67 illuminates the first surface 65 a as a display surface from the inside of the first light guide plate 65.

The thickness of the first light source 67 in the X-axis direction is substantially the same as the thickness of the first light guide plate 65 in the X-axis direction.
The width of the first light source 67 in the Y-axis direction is substantially the same as the width of the first light guide plate 65 in the Y-axis direction. The height of the first light source 67 in the Z-axis direction is substantially the same as the height of the first solar cell element 7 in the Z-axis direction.
The first light source 67 is bonded to the upper and lower ends of the first light guide plate 65 with an adhesive. As the adhesive, the adhesive used in the first solar cell element 7 according to the first embodiment described above may be used.

The second light source 68 is provided at each of the upper and lower ends of the second light guide plate 66. The second light source 68 has a light emitting surface 68 a that emits light toward the second light guide plate 66. The light emitting surface 68 a of the second light source 68 provided at the lower end of the second light guide plate 66 is in contact with the first end surface 66 c 1 of the second light guide plate 66.
The light emitting surface 68 a of the second light source 68 provided at the upper end of the second light guide plate 66 is in contact with the third end surface 66 c 3 of the second light guide plate 66. The second light source 68 illuminates the first surface 66 a as a display surface from the inside of the second light guide plate 66.

The thickness of the second light source 68 in the X-axis direction is substantially the same as the thickness of the second light guide plate 66 in the X-axis direction.
The width of the second light source 68 in the Y-axis direction is substantially the same as the width of the second light guide plate 66 in the Y-axis direction. The height of the second light source 68 in the Z-axis direction is substantially the same as the height of the second solar cell element 8 in the Z-axis direction.
The second light source 68 is bonded to the upper and lower ends of the second light guide plate 66 by an adhesive. As the adhesive, the adhesive used in the first light source 67 described above may be used.

As the first light source 67 and the second light source 68, an illumination light source such as a fluorescent lamp or an LED can be used.
Each of the first light source 67 and the second light source 68 emits light by the electric power generated by the first solar cell element 7 and the second solar cell element 8, the electric power stored by the power storage unit 10, or the like. Note that each of the first light source 67 and the second light source 68 may emit light by power supplied from an external power source.

The top plate 60 is disposed on the upper end side of the display body 2. The thickness of the top plate 60 in the X-axis direction is substantially the same as the thickness of the illumination unit 62 in the X-axis direction. The thickness in the X-axis direction of the illumination unit 62 includes the thickness in the X-axis direction of each of the detection unit 6 and the partition plate 13 disposed between the first illumination unit 63 and the second illumination unit 64.
The top plate 60 is bonded to the first light source 67, the first solar cell element 7, the partition plate 13, the second solar cell element 8, and the upper ends (+ Z-axis direction ends) of the second light source 68 with an adhesive. As the adhesive, the adhesive used in the first light source 67 described above may be used.

As described above, according to the display device 61 of the present embodiment, the illumination unit 62 is opposed to the first illumination unit 63 arranged to face the first light collector 3 and the second light collector 4. A second illumination unit 64 disposed. Therefore, the light emitted from the first light source 67 is suppressed from entering the first light collector 3, and the light emitted from the second light source 68 is suppressed from entering the second light collector 4. This suppresses the first solar cell element 7 from generating power with the light emitted from the first light source 67 and suppresses the second solar cell element 8 from generating power with the light emitted from the second light source 68. Therefore, it is not necessary to perform control for separating the first light L1 and the light emitted from the first light source 67, or to perform control for separating the second light L2 and the light emitted from the second light source 68. Therefore, the dimming control of the illumination unit 62 by the control unit 9 can be simplified.
Further, since each of the first light source 67 and the second light source 68 is disposed on the upper and lower end surfaces of the first light guide plate 65 and the second light guide plate 66, the components of the display device 61 are integrated. Therefore, space saving of the display device 61 can be achieved.

[Seventh embodiment]
FIG. 10 is an exploded perspective view showing a display device 71 according to the seventh embodiment.
As shown in FIG. 10, the basic configuration of the display device 71 according to the present embodiment is the same as that of the first embodiment, and the reflection plate 70 is disposed on a part of the outer peripheral end surface 4 c of the second light collector 4. The difference from the first embodiment is that the number of the first solar cell elements 7 arranged on the first light collector 3 is larger than the number of the second solar cells 8 arranged on the second light collector 4. Therefore, in this embodiment, the same code | symbol is attached | subjected to the structure same as 1st embodiment, and description of the basic composition of the display apparatus 71 is abbreviate | omitted.

The 1st solar cell element 7 is arrange | positioned at each of the 1st end surface 3c1, the 2nd end surface 3c2, the 3rd end surface 3c3, and the 4th end surface 3c4 which comprise the outer peripheral end surface 3c of the 1st light-condensing plate 3. FIG.
On the other hand, the second solar cell element 8 is disposed on the first end face 4 c 1 that constitutes the outer peripheral end face 4 c of the second light collector 4. The reflecting plate 70 is disposed on each end face of the second light collector 4 other than the first end face 4c1, that is, the second end face 4c2, the third end face 4c3, and the fourth end face 4c4.
The number of first solar cell elements 7 arranged on the first light collector 3 (for example, four in the present embodiment) is the number of second solar cell elements 8 arranged on the second light collector 4 (for example, four). In this embodiment, it is more than one).
The area (first total area) of the light receiving surface 7 a of the first solar cell element 7 disposed on the first light collector 3 is the light receiving surface 8 a of the second solar cell element 8 disposed on the second light collector 4. It may be larger than the area (second total area). The first total area is calculated by (area of the light receiving surface 7a of one first solar cell element 7) × (total number of first solar cell elements 7 arranged on the first light collector 3). The second total area is calculated by (area of the light receiving surface 8a of one second solar cell element 8) × (total number of second solar cell elements 8 arranged on the second light collector 4).

As the reflection plate 70, a plate body in which a reflection layer made of a dielectric multilayer film such as an ESR (Enhanced Specular Reflector) reflection film (manufactured by 3M) can be used on the second light collector 4 side. If this material is used as the reflective layer, a high reflectance of 98% or more can be realized under visible light.
In addition, as the reflecting plate 70, metal plates, such as aluminum (Al), copper (Cu), gold | metal | money (Au), silver (Ag), are mentioned. Further, as the reflecting plate 70, a material having diffuse reflectivity such as micro foamed PET (polyethylene terephthalate) manufactured by Furukawa Electric may be used.

As described above, according to the display device 71 in the present embodiment, the second solar cell element 8 is disposed on the first end surface 4 c 1 of the second light collector 4, and the reflector 70 is the second of the second light collector 4. It arrange | positions at each of the end surface 4c2, the 3rd end surface 4c3, and the 4th end surface 4c4. Therefore, at least a part of the light incident on each of the second end surface 4 c 2, the third end surface 4 c 3 and the fourth end surface 4 c 4 of the second light collector 4 is reflected by the reflecting plate 70 and the light receiving surface 8 a of the second solar cell element 8. Can be made incident. Therefore, a decrease in power generation efficiency can be suppressed.

Further, since the number of the first solar cell elements 7 arranged on the first light collector 3 is larger than the number of the second solar cell elements 8 arranged on the second light collector 4, the first light incident side Is preferable when the amount of power generation is larger than that of the second light incident side.
Compared to the case where the second solar cell element 8 is disposed on each of the first end surface 4c1, the second end surface 4c2, the third end surface 4c3, and the fourth end surface 4c4 of the second light collector plate 4, the second solar cell element. Since the number of arrangement of 8 can be reduced, the cost can be reduced.

In the present embodiment, the second solar cell element 8 is disposed on the first end face 4c1 of the second light collector 4, and the reflector 70 is the second end face 4c2, the third end face 4c3, and the fourth end of the second light collector 4. Although the example arrange | positioned at each of the end surface 4c4 was given and demonstrated, it is not restricted to this.
For example, the second solar cell element 8 is disposed on each of the second end face 4c2 and the fourth end face 4c4 of the second light collector 4, and the reflector 70 is formed on the first end face 4c1 and the third end face 4c3 of the second light collector 4. Each may be arranged. In this case, the first solar cell element 7 is disposed on each of the first end surface 3c1 and the third end surface 3c3 of the first light collector 3, and the reflecting plate 70 is the second end surface 3c2 and the fourth end surface 3c4 of the first light collector 3. It may be arranged in each of these.
That is, each of the first solar cell element 7 and the second solar cell element 8 may be disposed on at least one side of the four sides of the first light collector 3 and the second light collector 4. In addition, each of the first solar cell element 7 and the second solar cell element 8 may be arranged on the outer peripheral end surfaces of the first light collector 3 and the second light collector 4 with a predetermined interval or size. In addition, the reflecting plate 70 may be arranged on the outer peripheral end surfaces of the first light collector 3 and the second light collector 4 with a predetermined interval and size. The arrangement locations of the first solar cell element 7, the second solar cell element 8, and the reflection plate 70 can be appropriately changed from the viewpoint of cost, appearance design, and the like.

[Eighth embodiment]
FIG. 11 is a cross-sectional view showing a display device 81 according to the eighth embodiment. In FIG. 11, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 11, the display device 81 includes a display body 82, an illumination unit 85, a detection unit 86, a control unit 9, a power storage unit 10, and a support member 80.

The display body 82 is a signboard having a display surface 82a. Signage (advertisement medium) such as a sign or a sign is displayed on the display surface 82a.
The illumination unit 85 emits light by the electric power stored in the power storage unit 10 or the electric power supplied from an external power source. The illumination unit 85 illuminates the display surface 82a. The control unit 9 performs dimming control of the illumination unit 85 based on each of the first illuminance and the second illuminance detected by the first detection unit 87 and the second detection unit 88 described later.

The detection unit 86 includes a first detection unit 87 and a second detection unit 88.
The detection surface 87a of the first detection unit 87 faces the first light incident side. The first detector 87 detects the illuminance of the first light L1.
On the other hand, the detection surface 88a of the second detection unit 88 faces the second light incident side. The second detection unit 88 detects the illuminance of the second light L2.

The first detection unit 87 detects the first illuminance as the first detection data based on the first light L <b> 1 irradiated on the display surface 82 a from the outside of the display body 82.
The second detection unit 88 detects the second illuminance as the second detection data based on the second light L <b> 2 irradiated on the second surface 82 b from the outside of the display body 82. The second surface 82b is the surface opposite to the display surface 82a of the display body 82.
As the first detector 87 and the second detector 88, an illuminance sensor can be used.

The first detector 87 is joined to the display surface 82a at the lower end of the display body 82 with an adhesive. The second detection unit 88 is joined to the second surface 82b of the lower end portion of the display body 82 by an adhesive. As the adhesive, the adhesive used in the first solar cell element 7 according to the first embodiment described above may be used.

The support member 80 has an L shape in a sectional view. The base end 80 a of the support member 80 is attached to the upper end of the display body 82. An illumination unit 85 is attached to the tip 80 b of the support member 80.
As the illumination unit 85, an illumination light source such as a fluorescent lamp or an LED can be used. The illumination unit 85 includes a light emitting surface 85a that emits light toward the display surface 82a.

As described above, according to the display device 81 in the present embodiment, the control unit 9 performs control for dimming the illumination unit 85 based on each of the first illuminance and the second illuminance. Even if the display device 81 is installed in an environment in which the height varies, the display surface 82a can be appropriately illuminated. Accordingly, it is possible to suppress a decrease in the visibility of the display device 81.
Moreover, since the illumination part 85 can be light-modulated suitably to required brightness, it is suppressed that power is consumed more than necessary.
Moreover, since it is suppressed that the illumination part 85 is lighted excessively, the illumination part 85 can be used long (life extension).
For example, when an observer approaches the display device 81 in the daytime, a shadow may be generated on the display surface 82a. Even in this case, since the dimming control corresponding to the fluctuation of the surrounding brightness due to the shadow of the observer is performed by the control unit 9, it is possible to suppress a decrease in the visibility of the display surface 82a.

In the present embodiment, the example in which the detection unit 86 includes the first detection unit 87 and the second detection unit 88 has been described. However, the present invention is not limited thereto. For example, the detection unit 86 may include only one detection unit (illuminance sensor).
In this case, the detection unit 86 detects the first illuminance as the first detection data based on the first light L1 irradiated to the display surface 82a from the outside of the display body 82, and the second from the outside of the display body 82. The second illuminance is detected as second detection data based on the second light L2 applied to the surface 82b. The control unit 9 performs control to adjust the illumination unit 85 based on the first illuminance as the first detection data while setting the second illuminance as the second detection data to a constant value.

FIG. 12 is a diagram showing an application example of the display device according to the present invention.
FIG. 12 shows an example in which the display device is installed indoors (indoors). In FIG. 12, the display device 51 according to the fifth embodiment is applied for the sake of convenience, but display devices according to other embodiments can also be applied.
As shown in FIGS. 8 and 12, the display device 51 is installed indoors on a table 201 arranged at the window 200 so that the display surface 53 a faces the side opposite to the window 200 (inside the room). Is done. The observer observes the display element 42a from the side opposite to the window 200 in the room.
The window 200 is light transmissive. In the daytime, external light (second light L1) that has passed through the window 200 is incident on a surface opposite to the display surface 53a of the display device 51 (hereinafter, also referred to as a second surface). In the following description, for the sake of convenience, the outside light will be described as the second light L2 in FIG. 8, and the room light will be described as the first light L1 in FIG.

Table 2 shows an example of dimming control of the illumination unit 5 by the control unit 9 when the display device is installed indoors (see FIGS. 8 and 12).

In Table 2, the following criteria were set for each column of brightness of the installation location (indoor) and outdoor brightness.
“◯” in the brightness column of the installation location (indoor): This is a state in which room light (first light L1) is incident on the display surface 53a of the display device 51, that is, when the room illumination is on.
“X” in the brightness column of the installation location (indoor): This is a state in which room light (first light L1) does not enter the display surface 53a of the display device 51, that is, the room illumination is turned off.
“◯” in the outdoor brightness column: A state in which outside light (second light L2) passes through the window 200 and enters the second surface of the display device 51, that is, daytime.
“X” in the outdoor brightness column: Outside light (second light L2) passes through the window 200 and does not enter the second surface of the display device 51, that is, at night.

As shown in Table 2, when the brightness of the installation location (indoor) is “x” and the outdoor brightness is “x”, that is, when the room illumination is turned off at night, the display device 51 Since the surroundings are dark, the display element 42a can be viewed indoors even if the brightness of the illumination unit 5 is reduced.
In addition, when the brightness of the installation location (indoor) is “×” and the outdoor brightness is “◯”, that is, when the room illumination is turned off in the daytime, the surroundings of the display device 51 are dark. Even if the brightness of the illumination unit 5 is reduced, the display element 42a can be viewed indoors.
In addition, when the brightness of the installation location (indoor) is “◯” and the outdoor brightness is “x”, that is, when the room lighting is turned on at night, the brightness of the illumination unit 5 is set indoors. By making it brighter than the brightness, the display element 42a can be easily recognized.
Also, if the brightness of the installation location (indoor) is “◯” and the outdoor brightness is “◯”, that is, if the room lighting is turned on in the daytime, the display is displayed even if the lighting unit 5 is turned off. The element 42a can be visually recognized.

As mentioned above, although preferred embodiment which concerns on this invention was described referring drawings, it cannot be overemphasized that this invention is not limited to said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above embodiment are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.
In addition, specific descriptions regarding the shape, number, arrangement, material, formation method, and the like of each component of the display device are not limited to the above-described embodiment, and can be changed as appropriate.

One embodiment of the present invention can be used for a display device.

1, 21, 31, 41, 51, 61, 71, 81 ... display device, 2, 22, 32, 42, 52 ... display body, 3 ... first light collector, 3a ... first surface (first light incident surface) , First display surface), 3c ... outer peripheral end surface (first light exit surface), 4 ... second light collector, 4a ... second surface (second light incident surface, second display surface), 4c ... outer peripheral end surface (first (2 light emission surface), 5 ... illumination unit, 6, 26, 36 ... detection unit, 7 ... first solar cell element, 8 ... second solar cell element, 9 ... control unit, 10 ... power storage unit, 11 ... first Display unit, 12 ... second display unit, 13 ... partition plate, 33, 43, 53 ... light guide plate, 33a, 43a, 53a ... display surface, 37 ... solar cell element, 37a ... first light receiving surface (light receiving surface), 42a ... display element

Claims (20)

1. A display body having a first surface and a second surface, wherein at least one of the first surface and the second surface is a display surface;
   An illumination unit that illuminates the display surface;
   First detection data based on first light irradiated on the first surface from the outside of the display body and second detection data based on second light irradiated on the second surface from the outside of the display body A detection unit for detecting each;
   Based on each of the first detection data and the second detection data, a control unit that performs dimming control of the illumination unit,
   Display device.
2. The detection unit includes one or more solar cell elements that receive the first light to generate a first power and receive the second light to generate a second power. The display device according to 1.
3. The display body includes a light incident surface including the display surface and a light emitting surface having a smaller area than the light incident surface, and at least a part of external light incident from the light incident surface is emitted from the light. Including a light collecting plate to be emitted from the surface,
   The display device according to claim 2, wherein the solar cell element receives light emitted from the light exit surface of the light collector and generates electric power.
4. The light collecting plate absorbs at least a part of external light incident from the light incident surface by one or more optical functional materials and converts the light into light different from the light absorbed by the one or plural optical functional materials. The display device according to claim 3, wherein the light is emitted from the light exit surface.
5. The display device according to claim 3 or 4, wherein the solar cell element is disposed on at least a part of an outer peripheral end surface of the light collector.
6. The solar cell element is disposed on a part of the outer peripheral end surface of the light collector,
   The display device according to claim 5, wherein a reflection plate is disposed on the remaining part of the outer peripheral end face of the light collector.
7. The said light-condensing plate contains the 1st light-condensing plate into which said 1st light injects, and the 2nd light-condensing plate which is arrange | positioned facing the said 1st light-condensing plate and into which said 2nd light injects. The display device according to any one of 6 to 6.
8. The display device according to claim 7, wherein a partition plate that blocks each of the first light and the second light is provided between the first light collector and the second light collector.
9. The display device according to claim 8, wherein at least one of a surface where the partition plate faces the first light collector and a surface where the partition plate faces the second light collector has light reflectivity.
10. The number of arrangement | positioning of the 1st solar cell element arrange | positioned at said 1st light-condensing plate differs from the number of arrangement | positioning of the 2nd solar cell element arrange | positioned at said 2nd light-condensing plate in any one of Claim 7-9. The display device described.
11. The display device according to any one of claims 7 to 10, wherein the first light collector has a first display, and the second light collector has a second display.
12. The display device according to claim 11, wherein the first display and the second display are different from each other.
13. The display device according to any one of claims 2 to 12, further comprising a power storage unit that stores electric power generated by the solar cell element.
14. The display device according to claim 13, wherein the control unit performs control of dimming the illumination unit based on a remaining amount of electric power stored in the power storage unit.
15. The solar cell element has a light receiving surface that directly receives the first light or the second light,
    The display device according to claim 2, wherein the light receiving surface faces the same direction as the display surface of the display body.
16. The display body includes a light guide plate having the display surface,
    The display device according to claim 1, wherein the illumination unit illuminates the display surface from the inside of the light guide plate.
17. The display device according to claim 16, wherein a display element for displaying an image is provided inside the light guide plate.
18. The display body includes a light incident surface including the display surface and a light emitting surface having a smaller area than the light incident surface, and at least a part of external light incident from the light incident surface is emitted from the light. Including a light collecting plate to be emitted from the surface,
    The display device according to any one of claims 2 to 14, wherein the illumination unit includes a light guide plate disposed to face the light collector and a light source disposed on an outer peripheral end surface of the light guide plate. .
19. The display body is a signboard having the display surface,
    The display device according to claim 1, wherein the illumination unit illuminates the display surface from the outside of the signboard.
20. The said control part makes said 2nd detection data a fixed value, and performs control which adjusts the said illumination part based on said 1st detection data. Display device.

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