JP2012177772A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which is sufficiently and visibly recognized as an even surface illuminant even when it is used at a state where at least a part is immersed in liquid or at a state where at least a part contacts the liquid.SOLUTION: A display device is used at a state where at least a part is immersed in liquid or a state where at least a part contacts the liquid, and has: a light source part which emits light; a light guide part which is adjacent to the light source part, on the principal plane of which a recess for deriving the light radiated from the light source part as diffusion light is formed; and a luminous layer in which a space is provided with the recess at a state of close adhesion to the principal plane of the light guide part, and which transmits or reflects the diffusion light.

Description

  The present invention relates to a display device that is used in a state in which at least a part is immersed in a liquid or a state in which the liquid is touched.

  Conventionally, for an underwater display device that is installed in the water of a pool or the like and displays guidance etc., a board-side connector connected by a relay line that conductively connects an LED mounted on the board, a case containing the board and the board-side connector, The underwater display device is composed of a main body composed of a cable gland provided in a case, and a cable inserted through the cable gland and connected to a cable side connector at a lead-out portion, wherein the board side connector and the cable side connector are There is a configuration in which the cable-side connector is formed in such a size that it can be inserted through the pipe of the cable gland (for example, see Patent Document 1).

  In addition, with respect to the production lighting device that can produce the interior of the bathtub satisfactorily, it is provided in a case body having a sealed structure that can be floated on the water surface in the bathtub or submerged in water, and a portion located below the water surface of the case body There is a configuration including a light emitting unit, a battery provided in a case body for supplying power to the light emitting unit, and an operation switch capable of operating the light emission of the LED from the outside of the case body (see, for example, Patent Document 2).

  In addition, as shown in FIGS. 19 and 20, a display device 1000 used in a conventional state immersed in water or the like includes a light source unit 1010 provided with a light emitting diode, and a recess for deriving light emitted from the light emitting diode as diffused light. Is composed of a light guide portion 1020 provided with a light guide plate 1021 formed on the main surface. Here, FIG. 20 is a schematic diagram showing the optical characteristics of the conventional display apparatus 1000, and each light ray starts to be illustrated from the state of propagating inside the light guide plate 1021. In the calculation relating to the refraction and total reflection of each light ray, the refractive index of air A is 1.000, the refractive index of water W is 1.333, and the wavelength is 589 nm corresponding to Na d line. The refractive index of the light guide plate 1021 is 1.490.

  Specifically, in the conventional display apparatus 1000, the light indicated by the light beam L41 shown in FIG. 20 is transmitted through the boundary surface with the water W from the light guide plate 1021 of the light guide unit 1020, and is totally transmitted at the boundary surface with the air A. The light is reflected and enters the light guide plate 1021. The light indicated by the light ray L42 is totally reflected in the order of the boundary surface between the light guide plate 1021 and the water W and the boundary surface between the concave portion of the light guide plate 1021 and the water W. Further, the light indicated by the light ray L43 is transmitted through the boundary surface with the water W from the light guide plate 1021. The light indicated by the light beam L44 is transmitted from the light guide plate 1021 in the order of the boundary surface with the water W and the boundary surface with the air A. Further, the light indicated by the light beam L45 passes through the boundary surface between the light guide plate 1021 and the water W, and passes through the boundary surface between the water W and the concave portion of the light guide plate 1021. Further, the light indicated by the light ray L46 is totally reflected at the boundary surface between the concave portion of the light guide plate 1021 and the water W and is transmitted through the boundary surface with the water W. The light indicated by the light beam L47 is transmitted from the light guide plate 1021 in the order of the boundary surface with the water W and the boundary surface with the air A. The light indicated by the light beam L48 is all in the order of the boundary surface between the light guide plate 1021 and the water W, the boundary surface between the concave portion of the light guide plate 1021 and the water W, and the boundary surface between the light guide plate 1021 and the water W. Reflected.

JP-A-2005-024947 JP 2002-042521 A

  However, in the configuration as described above, there is a problem that it is difficult to visually recognize the light as a uniform surface light source. In particular, in a conventional display device immersed in water, there is a problem that it is difficult to visually recognize light derived from the light guide plate when the light guide plate immersed under the water surface is viewed from above the water. Specifically, in FIG. 21A, when the wavelength is 589 nm, the refractive index of the water W is 1.333, and the refractive index of the light guide plate 1100 is 1.490, the light enters the water W from the light guide plate 1100. The critical angle θ1 of light is 63.5 °. On the other hand, in FIG. 21B, when the wavelength is 589 nm, the refractive index of the air A is 1.000, and the refractive index of the light guide plate 1200 is 1.490, the criticality of light incident on the air A from the light guide plate 1200 The angle θ3 is 42.2 °. Therefore, light incident on one main surface 1100a is totally reflected in the range indicated by θ2 in the light guide plate 1100, and light incident on the main surface 1200a is totally reflected in the range indicated by θ3 in the light guide plate 1200. For this reason, when the critical angle of light is taken as an example, the light guide plate 1100 immersed in water shown in FIG. 21A is compared with the light guide plate 1200 placed in the air shown in FIG. Since it is difficult for the light to be multiple-reflected inside the light guide plate 1100, the amount of light derived from the light guide plate 1100 may be significantly reduced every time the light source plate 1100 is separated from the light source, and it is difficult to obtain a uniform surface light source.

  Therefore, in view of the above technical problem, the present invention provides a display that can be sufficiently visually recognized as an even surface light source even when used in a state where at least a part thereof is immersed in or in contact with the liquid. The purpose is to provide a device.

  In order to solve the above-described problems, a display device according to the present invention is a display device that is used in a state where at least a part thereof is immersed in a liquid or in contact with a liquid, and includes a light source unit that emits light, A light guide part adjacent to the light source part, and having a concave part formed on the main surface for deriving the light emitted from the light source part as diffused light; and the concave part in close contact with the main surface of the light guide part. And a light emitting layer portion that transmits or reflects the diffused light.

  According to the display device of the present invention, even when used in a state where at least a part is immersed in a liquid or in a state where the liquid is touched, it can be sufficiently visually recognized as an even surface light source.

It is a perspective view which shows the display apparatus which each provided the light guide part and light emitting layer part in which the recessed part was formed in the main surface which concerns on the 1st Embodiment of this invention. It is a perspective view which decomposes | disassembles and shows the display apparatus which concerns on the 1st Embodiment of this invention for every structure. It is a perspective view which shows the principal part of the display apparatus which concerns on the 1st Embodiment of this invention in a cross section. It is sectional drawing which shows the principal part of the display apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the display apparatus which provided the light guide part in which the recessed part from which a magnitude | size differs was formed in the main surface which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the principal part of the display apparatus which provided the light emitting layer part which consists of a base material and the adhesive material which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the optical characteristic of the display apparatus which concerns on the 1st Embodiment of this invention, (a) is a schematic diagram of the principal part of the display apparatus which does not illustrate a light ray, (b) illustrates a light beam. It is a schematic diagram of the principal part of a display device. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the display apparatus used by curving the light guide part and the light emitting layer part which concern on the 1st Embodiment of this invention, and immersing in water etc., (a) is a schematic diagram which shows the whole display apparatus, ( b) is a schematic view showing a part of the display device. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the display apparatus which arrange | positions outdoors and uses it in rainy weather etc. which concern on the 1st Embodiment of this invention, (a) is a schematic diagram which shows the whole display apparatus, (b) is a display apparatus. It is a schematic diagram which shows a part of. It is a perspective view which shows the display apparatus which each provided the light guide part in which the main surface which concerns on the 2nd Embodiment of this invention, and the convex part which protruded so that the outer periphery of this recessed part might be enclosed was formed, and the light emitting layer part. is there. It is a perspective view which decomposes | disassembles and shows the display apparatus which concerns on the 2nd Embodiment of this invention for every structure. It is a perspective view which shows the principal part of the display apparatus which concerns on the 2nd Embodiment of this invention in a cross section. It is sectional drawing which shows the principal part of the display apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which expands and shows the principal part of the display apparatus which concerns on the 2nd Embodiment of this invention, and respond | corresponds to FIG. It is sectional drawing which shows the display apparatus which provided the light guide part in which the recessed part from which a magnitude | size differs was formed in the main surface which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the principal part of the display apparatus which provided the light emitting layer part which consists of a base material and the adhesive material which concerns on the 2nd Embodiment of this invention. Light guide unit and light emission in which concave part and convex part protruding so as to surround outer periphery of concave part are formed on main surface obtained by photographing display device according to second embodiment of the present invention using a microscope It is a microscope picture which shows the structure of a layer part. It is a schematic diagram which shows the optical characteristic of the display apparatus which concerns on the 2nd Embodiment of this invention, (a) is a schematic diagram of the principal part of the display apparatus which does not illustrate a light ray, (b) illustrates a light beam. It is a schematic diagram of the principal part of a display device. It is a perspective view which shows the display apparatus which does not provide the conventional light emitting layer part. It is a schematic diagram which shows the optical characteristic of the conventional display apparatus. It is a schematic diagram which shows the general optical characteristic which concerns on the refraction | bending and total reflection of the conventional display apparatus.

  Hereinafter, preferred embodiments of the display device of the present invention will be described with reference to the drawings. The display device of the present invention is not limited to the following description, and can be appropriately changed without departing from the gist of the present invention. Specifically, in the following description, the material, shape, and the like of each constituent member constituting the display device of the present invention are examples, and can be appropriately changed to other materials, shapes, and the like.

  In the following description, first, the display device 1 according to the first embodiment of the present invention will be described with reference to FIGS. Next, a display device 4 according to a second embodiment of the present invention will be described with reference to FIGS. Furthermore, the manufacturing method of the light-guide plate of each light guide part provided in the display apparatus 1 thru | or the display apparatus 4 which concerns on this invention is demonstrated. Finally, the structure and main effects of the display devices 1 to 4 according to the present invention will be described for each claim.

[First Embodiment]
Hereinafter, the display device 1 according to the first embodiment of the present invention will be specifically described with reference to FIGS.

  In the description of the display device 1 according to the first embodiment, first, the configuration of the display device 1 will be described with reference to FIGS. 1 to 6, and then the optical characteristics of the display device 1 will be described with reference to FIGS. 20 will be described in comparison with the conventional display device 1000, and a method of using the display device 1 will be described with reference to FIGS.

  First, the configuration of the display device 1 will be described with reference to FIGS. 1 to 6.

  The display device 1 according to the first embodiment is used in a state where at least a part of the display device 1 is immersed in a liquid or a state where the liquid is touched. Such a display device 1 includes a light source unit 10, a light guide unit 20, and a light emitting layer unit 30, as shown in FIGS. Note that FIG. 2 shows the light-transmitting sheet 21 of the light-emitting layer portion 30 through the concave portions 21b of the light-guide plate 21 and the light-emitting layer portion 30 in order to facilitate understanding of the invention. Hereinafter, each structure of the display apparatus 1 is demonstrated in order.

  The light source unit 10 constituting the display device 1 emits light. As shown in FIG. 2, such a light source unit 10 includes a light source 11, a substrate 12, a holding member 13, and a holding member lid 14. Hereinafter, each member which comprises the light source part 10 is demonstrated in order. As the light source 11 of the light source unit 10, a surface-mounted light emitting diode (LED) is used. Specifically, the light source 11 is configured by an LED formed of any one of white, red, orange, yellow, green, blue, indigo, and purple or a combination of these colors. Moreover, you may comprise the light source 11 by LED which emits the light of an ultraviolet region or an infrared region. A plurality of such light sources 11 are arranged at predetermined intervals on a substrate 12 described later. The light source 11 is not limited to the LED, and may be configured by an organic light emitting diode, a fluorescent tube, a cold cathode tube, a neon tube, or the like. Further, a plate-like glass epoxy substrate is used as the substrate 12 of the light source unit 10. The holding member 13 of the light source unit 10 is made of an aluminum alloy and has a plate shape with a U-shaped cross section. A substrate 12 on which a plurality of light sources 11 are mounted is screwed to one surface 13a of the holding member 13 with screws (not shown). The holding member lid 14 of the light source unit 10 is made of an aluminum alloy and is formed in a plate shape. Such a holding member lid 14 is composed of a pair, and is screwed to one end 13b and the other end 13c of the holding member 13 with screws (not shown).

  The light guide unit 20 constituting the display device 1 is composed of a light guide plate 21 that is adjacent to the light source unit 10 and has a concave portion that leads out light emitted from the light source unit 10 as diffused light. The light guide plate 21 is made of a transparent acrylic resin plate. The light guide plate 21 is not limited to a transparent resin plate, and a colored resin plate may be used. Further, the light guide plate 21 may be a resin plate to which a fine-particle diffusing member that emits diffused light when irradiated with light in the visible range is added. Similarly, the light guide plate 21 may be a resin plate coated or added with a fluorescent agent that emits fluorescence when irradiated with light in the ultraviolet region or visible region. Further, as shown in FIG. 4, light emitted from the light source unit 10 through the side surface 21 e of the light guide plate 21 is derived as diffused light on one main surface 21 a that is the main surface of the light guide plate 21 of the light guide unit 20. The recessed part 21b to be made is formed. Similarly, the light emitted from the light source unit 10 through the side surface 21e of the light guide plate 21 to the other main surface 21c that is the main surface facing the one main surface 21a of the light guide plate 21 of the light guide unit 20 as diffused light. A recessed portion 21d to be led out is formed. Such recesses 21b and recesses 21d have a quadrangular pyramid shape, and are formed in a matrix at intervals of 1 mm to 6 mm with respect to the one main surface 21a and the other main surface 21c. In addition, the surface of the recessed part 21b and the recessed part 21d consists of a surface which has a mirror surface or predetermined surface roughness. Here, most of the diffused light generated in the plurality of recesses 21b formed on one main surface 21a of the light guide plate 21 is derived from the other main surface 21c of the light guide plate 21 as light of substantially uniform surface emission. Similarly, most of the diffused light generated in the plurality of recesses 21d formed on the other main surface 21c of the light guide plate 21 is derived from the one main surface 21a of the light guide plate 21 as substantially uniform surface emitting light.

  Moreover, regarding the light guide unit 20 constituting the display device 1, the light guide plate 22 illustrated in FIG. 5 corresponds to a modification of the light guide plate 21, and the depth of the recess 22b of the one main surface 22a and the depth of the recess 22d of the other main surface 22c. Is formed so as to be deeper every time the light source plate 10 is separated from the side surface 22e of the light guide plate 22 on which light is incident. Here, when the light of the light source unit 10 is incident from the side surface 22e of the light guide plate 22, the amount of light propagating is decreased every time the light source unit 10 is separated from the side surface 22e of the light guide plate 22, but the light is separated from the side surface 22e of the light guide plate 22. Even in this case, a decrease in the amount of diffused light generated in the recess can be suppressed. Therefore, the light guide plate 22 shown in FIG. 5 is compared with the light guide plate 21 shown in FIG. 4 from the one main surface 22a and the other main surface 22c of the light guide plate 22 regardless of the distance from the side surface 22e of the light guide plate 22. Uniform surface emission is derived. Therefore, the light guide plate 22 shown in FIG. 5 is effective when the amount of light propagating every time the light emitting layer portion 30 described later is separated from the side surface 22e of the light guide plate 22 is greatly reduced.

  The light emitting layer part 30 constituting the display device 1 is in close contact with the main surface of the light guide part 20, and a space is provided between the light emitting part part 20 and the diffused light is transmitted or totally reflected. Such a light emitting layer part 30 is comprised from the light emitting sheet 31, as shown in FIG.2 and FIG.4. The light emitting sheet 31 is made of polyvinyl chloride or the like and is formed in a thin film shape. Here, the light emitting sheet 31 is in close contact with the one main surface 21a and the other main surface 21c of the light guide plate 21 of the light guide unit 20, and the recess 21b formed on the one main surface 21a of the light guide plate 21 and the other main surface. It is affixed in a state of being separated from the recess 21d formed in 21c. In addition, a gas or a filler is enclosed in a space provided between the concave portions 21 b and the concave portions 21 d of the light guide plate 21 of the light guide portion 20 and the light emitting sheet 31 of the light emitting layer portion 30. Specifically, the enclosed gas is air or nitrogen. The filled filler has a refractive index lower than that of the light guide plate 21 or the light emitting sheet 31 and is made of a fluorine-based polymer. Here, the light emitting sheet 31 transmits or totally reflects the diffused light generated in the concave portion 21b and the concave portion 21d of the light guide plate 21 of the light guide portion 20. The light emitting sheet 31 may be provided in close contact with only one of the main surface 21a and the other main surface 21c of the light guide plate 21 of the light guide unit 20. The light emitting sheet 32 shown in FIG. 6 corresponds to a modification of the light emitting sheet 31 and includes a base material 32a and an adhesive material 32b. The base material 32a is one main surface 21a of the light guide plate 21 via the adhesive material 32b. Alternatively, it is in close contact with the other main surface 21c. The base material 32a of the light emitting sheet 32 is made of polyvinyl chloride or the like, and has a layer thickness of 50 μm to 100 μm. The base material 32a of the light emitting sheet 32 does not transmit ultraviolet rays. The adhesive material 32b of the light emitting sheet 32 is made of an acrylate copolymer or the like, and has a layer thickness of 30 μm.

  Next, the optical characteristics of the display device 1 will be specifically described in comparison with the conventional display device 1000 with reference to FIGS. 7, 19, and 20.

  Regarding the optical characteristics of the display device 1, the optical characteristics of the display device 1 are schematically shown in FIG. First, the optical characteristics of the display device 1 will be described based on the light rays L11 to L18 shown in FIG. In FIG. 7, the light rays L11 to L18 start to be illustrated from the state where they are propagating through the inside of the light guide plate. Similarly, in order to facilitate understanding of the invention, in FIG. 7, the reference numerals of the light rays L11e to L18e are attached to the ends of the light rays L11 to L18. In the calculation related to the refraction and total reflection of each ray, the refractive index of air A and A1 is 1.000, and the refractive index of water W is 1.333, with the wavelength being 589 nm corresponding to the d-line of Na. The refractive index of the light guide plate 21 is 1.490, and the refractive index of the light emitting sheet 31 is 1.550. The angle of light refraction and total reflection at the boundary surface also depends on the surface roughness at the boundary surface. Further, the angle of light refraction and total reflection at the boundary surface also depends on the value of the wavelength at which the refractive index decreases from a short wavelength to a long wavelength.

  Specifically, regarding the optical characteristics of the display device 1, in the schematic diagram relating to the optical characteristics of the display device 1 shown in FIG. 7, the light indicated by the light beam L <b> 11 transmits the light emitting sheet 31 and the water W, and the air A and water The light is totally reflected at the boundary surface with W and is incident on the light emitting sheet 31 and the light guide plate 21 again. Further, the light indicated by the light beam L12 is transmitted through the light emitting sheet 31, and after multiple reflection between the boundary surface between the water W and the light emitting sheet 31, and the boundary surface between the air A1 and the light emitting sheet 31, the light guide plate 21. Is incident again. The light indicated by the light beam L13 is transmitted in the order of air A1, light emitting sheet 31, water W, and air A. Moreover, the light shown in the light ray L14 is transmitted in the order of the light emitting sheet 31, the water W, and the air A. Further, the light indicated by the light beam L15 is incident on the light guide plate 21 again after passing through the air A1. The light indicated by the light ray L16 is totally reflected at the boundary surface between the air A1 and the light guide plate 21, and is transmitted in the order of the light emitting sheet 31 and the water W. Moreover, the light shown in the light ray L17 is transmitted in the order of air A1, light emitting sheet 31, water W, and air A. The light indicated by the light beam L18 is totally reflected at the boundary surface between the air A1 and the light guide plate 21 and is transmitted through the light emitting sheet 31.

  Here, regarding the optical characteristics of the display apparatus 1, in the schematic diagram relating to the optical characteristics of the display apparatus 1 shown in FIG. 7, the light is totally reflected by the recess 21 b provided with the light emitting sheet 31 and formed in the light guide plate 21. Or there are many boundary surfaces that are refracted and transmitted. On the other hand, in the schematic diagram related to the optical characteristics of the conventional display device 1000 shown in FIG. 20, since the light-emitting sheet is not provided, the optical characteristics are compared with the schematic diagram related to the optical characteristics of the display device 1 shown in FIG. There are very few boundary surfaces that are totally reflected or refracted and transmitted. Here, when the display device 1 immersed in water shown in FIG. 7 is visually recognized, the boundary through which light is totally reflected or refracted and transmitted is compared with the conventional display device 1000 placed in the air shown in FIG. There are more faces and it is recognized brightly. Hereinafter, the reason will be described by dividing it into three phenomena.

  In the optical characteristics of the display device 1, regarding the first phenomenon, when light is refracted and transmitted and propagates toward the viewer at each boundary surface of the light guide unit 20 and the light emitting layer unit 30 of the display device 1. The light can be visually recognized. Next, regarding the second phenomenon, even when light is refracted and transmitted and propagates in a direction different from the direction of the viewer at each boundary surface of the light guide unit 20 and the light emitting layer unit 30 of the display device 1, Since light that is totally reflected together with transmitted light is generated at each boundary surface, the light that has propagated in the direction of the viewer among the totally reflected light can be visually recognized. Specifically, it is extremely rare that all of the amount of propagating light is transmitted or totally reflected at each boundary surface, and light is emitted at a very shallow angle of 5 degrees with respect to the normal direction of the boundary surface. Even when incident, several percent of the light is reflected without being transmitted at the boundary surface. Note that as the incident angle of light with respect to the normal direction of the boundary surface increases, the ratio of light that does not transmit through the boundary surface of the light increases. In addition, the lower the surface accuracy of the boundary surface, the higher the proportion of light reflected without being transmitted at the boundary surface of the light.

  Further, regarding the third phenomenon in the optical characteristics of the display device 1, light is totally reflected and propagates in the direction of the viewer at each boundary surface of the light guide unit 20 and the light emitting layer unit 30 of the display device 1. The light can be visually recognized. In other words, in the display device 1, light is totally reflected or refracted and transmitted at each boundary surface between the light guide unit 20 and the light emitting layer unit 30, and a part of the light propagates in the direction of the viewer. Is done. Accordingly, the display device 1 shown in FIG. 7 has a larger boundary surface through which light is totally reflected or refracted and transmitted than the conventional display device 1000 shown in FIG. 20, and is recognized brighter than the conventional display device 1000. The

  Further, a method of using the display device 1 will be specifically described with reference to FIGS. 8 and 9.

  Regarding the method of using the display device 1, the display device 2 shown in FIG. 8 is a modification of the display device 1, and schematically shows a state in which the light guide unit 40 and the light emitting layer unit 50 are bent and immersed in water. ing. The display device 2 can be used without immersing the light source unit 10 in water because the light guide unit 40 and the light emitting layer unit 50 are refracted or bent. Here, as described above with reference to FIG. 7 and FIG. 20 regarding the optical characteristics of the device, the conventional display device 1000 cannot sufficiently emit the light guide plate 1021 of the light guide unit 1020 when immersed in water. However, the display device 2 shown in FIG. 8 can sufficiently emit the light emitting sheet 51 of the light emitting layer portion 50 through the light guide plate 41 of the light guide portion 40. Further, the display device 3 shown in FIG. 9 is a modified example in which the size of each component of the display device 1 is changed, and a state in which the display device 3 is disposed outdoors and used in the rain is schematically illustrated. . Here, even when used in rainy weather, the conventional display device 1000 cannot sufficiently emit the light guide plate 1021 of the light guide unit 1020, but the display device 3 shown in FIG. The light emitting sheet 71 of the light emitting layer portion 70 can be made to emit light sufficiently through the light guide plate 61. Accordingly, the display device 3 can sufficiently emit light on the display plate 81 of the display unit 80 that is stacked on the light emitting sheet 71 of the light emitting layer unit 70 and displays predetermined information. Information consisting of “○ □ △” can be sufficiently notified.

  As described above, according to the display devices 1 to 3 of the first embodiment, even when used in a state where at least a part is immersed in a liquid or in a state where the liquid is in contact with the liquid, it is sufficiently visible as an even surface light source. Can do.

  Specifically, according to the display devices 1 to 3 of the first embodiment, according to the display devices 1 to 3 described in claim 2 as described above, it is easy to obtain and the refractive index is relatively low. Using air or nitrogen, light can be totally reflected or refracted between the recess of the light guide 20, 40, or 60 and the light emitting layer 30, 50, or 70. Furthermore, the boundary surface between the light emitting layer portion 30, 50, or 70 and the water W, and the boundary between the air A1 enclosed in the concave portion of the light guide portion 20, 40, or 60 and the light emitting layer portion 30, 50, or 70. The light can be multiple-reflected at the surface.

  Further, according to the display devices 1 to 3 of the first embodiment, the light-emitting layer portion 30, 50, or 70 and the one main surface formed on one of the light guide portions 20, 40, or 60, the light guide portion. The other main surface formed on the other of 20, 40, or 60, or the one main surface formed on one and the other of the light guides 20, 40, or 60 and the boundary surface formed in close contact with the other main surface In, light can be totally reflected or refracted.

  Further, according to the display devices 1 to 3 of the first embodiment, in the display device 3 shown in FIG. 9, the display plate of the display unit 80 that is stacked on the light emitting sheet 71 of the light emitting layer unit 70 and displays predetermined information. Since 81 can be made to emit light sufficiently, it is possible to sufficiently inform information including “◯ □ Δ” displayed on the display board 81.

[Second Embodiment]
Hereinafter, the display device 4 according to the second embodiment of the present invention will be specifically described with reference to FIGS. 10 to 18.

  The display device 4 according to the second embodiment of the present invention has, as shown in FIGS. 10 and 11, a concave portion that guides light emitted from the light source unit 10 as diffused light is formed on the main surface, and The light guide part 90 formed so as to protrude from the main surface so that the convex part surrounds the outer periphery of the concave part, and at least a part of the main surface of the light guide part 90 and at least the tip of the convex part, A feature is that a space is provided between the convex portion and a space between the outer periphery of the convex portion and a light emitting layer portion 100 that transmits or totally reflects diffused light is provided. . Other configurations according to the second embodiment are the same as the configurations described in the first embodiment. Therefore, in the second embodiment, the configuration different from the first embodiment will be mainly described. In the description of the display device 4 according to the second embodiment, first, the configuration of the display device 4 will be described with reference to FIGS. 10 to 17, and then the optical characteristics of the display device 4 will be described with reference to FIG. While explaining.

  First, the configuration of the display device 4 will be described with reference to FIGS. 10 to 17.

  Similar to the display device 1 according to the first embodiment, the display device 4 according to the second embodiment is used in a state where at least a part thereof is immersed in or in contact with the liquid. As shown in FIGS. 10 and 11, such a display device 4 has the same light source unit 10 as the configuration provided in the display device 1 of the first embodiment and the display device 4 of the second embodiment. The light guide part 90 and the light emitting layer part 100 are comprised. Therefore, the light guide unit 90 and the light emitting layer unit 100 unique to the display device 4 of the second embodiment will be mainly described. In addition, in order to make an understanding of invention easy, FIG. 11 permeate | transmits the recessed part 91b etc. of the light guide plate 91 of the light guide part 90, and the light emission sheet | seat 101 of the light emitting layer part 100, and has shown in figure. Further, FIG. 17 shows a concave portion 91b and a convex portion 91h protruding so as to surround the outer periphery of the concave portion 91b on one main surface 91a of the light guide plate 91 obtained by photographing the display device 4 using a microscope. The photograph of the light guide plate 91 of the light guide part 90 and the light emitting sheet 101 of the light emitting layer part 100 in which is formed is shown.

  The light guide unit 90 that constitutes the display device 4 is adjacent to the light source unit 10, has a recess formed on the main surface that guides light emitted from the light source unit 10 as diffused light, and the projection surrounds the outer periphery of the recess. Thus, it is formed so as to protrude from the main surface. Such a light guide unit 90 includes a light guide plate 91 as shown in FIGS. The material of the light guide plate 91 is the same as that of the light guide plate 21 of the light guide unit 20 provided in the display device 1 according to the first embodiment. In addition, a concave portion 91b that guides light emitted from the light source unit 10 through the side surface 91e of the light guide plate 91 as diffused light is formed on one main surface 91a that is the main surface of the light guide plate 91 of the light guide unit 90. Yes. Here, on one main surface 91a of the light guide plate 91, a convex portion 91h is formed to protrude from the one main surface 91a so as to surround the outer periphery of the concave portion 91b. Similarly, the light emitted from the light source unit 10 through the side surface 91e of the light guide plate 91 to the other main surface 91c, which is the main surface facing the one main surface 91a of the light guide plate 91, is used as diffused light. A recessed portion 91d to be led out is formed. Here, on the other main surface 91c of the light guide plate 91, a convex portion 91i is formed to protrude from the other main surface 91c so as to surround the outer periphery of the concave portion 91d. Moreover, the recessed part 91b and the recessed part 91d consist of a quadrangular pyramid shape, and are formed in matrix form at intervals of 1 mm to 6 mm with respect to the one main surface 91a and the other main surface 91c. In addition, the surface of the convex part 91h and the convex part 91i consists of a surface which has a mirror surface or predetermined surface roughness. Here, most of the diffused light generated in the plurality of recesses 91b formed on the one main surface 91a of the light guide plate 91 is led out from the other main surface 91c of the light guide plate 91 as substantially uniform surface light. Similarly, most of the diffused light generated in the plurality of concave portions 91d formed on the other main surface 91c of the light guide plate 91 is derived from the one main surface 91a of the light guide plate 91 as substantially uniform surface emission light.

  Further, with respect to the light guide unit 90 constituting the display device 4, the light guide plate 92 shown in FIG. 15 corresponds to a modification of the light guide plate 91, and the depth of the recess 92b of the one main surface 92a and the depth of the recess 92d of the other main surface 92c. Is formed so as to become deeper every time the light source plate 10 is separated from the side surface 92e of the light guide plate 92 on which the light is incident. In addition, the depth of the convex portion 92h of the one main surface 92a and the convex portion 92i of the other main surface 92c is formed so as to increase each time it is separated from the side surface 92e of the light guide plate 92 on which the light of the light source unit 10 is incident. ing. Here, when the light of the light source unit 10 is incident from the side surface 92e of the light guide plate 92, the amount of light propagating decreases every time the light source plate 10 is separated from the side surface 92e of the light guide plate 92, but is separated from the side surface 92e of the light guide plate 92. Even in this case, a decrease in the amount of diffused light generated in the recess can be suppressed. Therefore, the light guide plate 92 shown in FIG. 15 is separated from the one main surface 92a and the other main surface 92c of the light guide plate 92 regardless of the distance from the side surface 92e of the light guide plate 92, as compared with the light guide plate 91 shown in FIG. Uniform surface emission is derived. Therefore, the light guide plate 92 shown in FIG. 15 is effective when the light amount of light propagating every time the light emitting layer unit 100 described later is separated from the side surface 92e of the light guide plate 92 is greatly reduced.

  The light emitting layer portion 100 that constitutes the display device 4 is provided with a space between the concave portion and the convex portion and in a state where the convex portion is in close contact with at least a part of the main surface of the light guide portion 90 and at least the tip of the convex portion. A space is provided between the outer periphery of the unit and diffused light is transmitted or totally reflected. Here, as shown in FIGS. 10 and 11, the light emitting sheet 101 provided in the light emitting layer unit 100 abuts on the plurality of convex portions 91 h and convex portions 91 i of the light guide plate 91 provided in the light guide portion 90. In this case, the abutted portion is raised in a circular shape. That is, as shown in FIGS. 10 and 11, the light emitting sheet 101 of the light emitting layer portion 100 is in contact with the convex portions 91 h and the convex portions 91 i formed in a matrix shape on the light guide plate 91, and is circular in a matrix shape. It becomes a raised state. Such a light emitting layer part 100 is comprised from the light emitting sheet 101, as shown in FIG.10 and FIG.13. The light emitting sheet 101 is made of polyvinyl chloride or the like and is formed in a thin film shape. Here, as shown in FIGS. 13, 14, and 17, the light emitting sheet 101 is formed on the concave portion 91b and the other main surface 91c formed on the one main surface 91a of the light guide plate 91 of the light guide portion 90. In a state of being separated from the recess 91d, it is in close contact with at least a part of the one main surface 91a and the other main surface 91c, and is in close contact with at least the tips of the convex portions 91h and 91i. Here, as shown in FIG. 12, the light emitting sheet 101 has portions where the convex portions 91 h and the convex portions 91 i of the light guide plate 91 are in close contact with one main surface 91 a and the other main surface 91 c of the light guide plate 91. It bulges in a circular shape with respect to the close contact area.

  In addition, regarding the light emitting layer unit 100 constituting the display device 4, gas or gas is introduced into a space provided between the recess 91 b and the recess 91 d of the light guide plate 91 of the light guide unit 90 and the light emitting sheet 101 of the light emitting layer unit 100. Filler is enclosed. Similarly, a gas or a filler is enclosed in a space provided between the convex portions 91 h and the convex portions 91 i of the light guide plate 91 of the light guide portion 90 and the light emitting sheet 101 of the light emitting layer portion 100. Specifically, the enclosed gas is air or nitrogen. The filled filler has a refractive index lower than that of the light guide plate 91 or the light emitting sheet 101 and is made of a fluorine-based polymer. Further, the light emitting sheet 101 transmits or totally reflects the diffused light generated in the concave portions 91b and the concave portions 91d of the light guide plate 91 of the light guide portion 90. The light emitting sheet 101 may be provided in close contact with only one of the main surface 91a and the other main surface 91c of the light guide plate 91 of the light guide unit 90. A light emitting sheet 102 shown in FIG. 16 corresponds to a modification of the light emitting sheet 101, and includes a base material 102a and an adhesive material 102b. The base material 102a is provided with a concave portion 91b and a concave portion of the light guide plate 91 via the adhesive material 102b. The first main surface 91a and the other main surface 91c are in close contact with each other in a state of being separated from 91d, and are in close contact with at least the tips of the convex portions 91h and 91i.

  Next, the optical characteristics of the display device 4 will be specifically described with reference to FIG.

  Regarding the optical characteristics of the display device 4, the optical characteristics of the display device 4 are schematically shown in FIG. In addition, like the description of the optical characteristics of the display device 1 of the first embodiment described above, each light ray starts to be illustrated from the state where it propagates through the light guide plate. In FIG. 18, the illustration of the light beams starts from the state in which each light beam propagates inside the light guide plate. Similarly, in order to facilitate the understanding of the invention, the end of each ray is denoted by the symbol e in FIG. Further, in the calculation relating to the refraction and total reflection of each light ray, the refractive index of air A, A1, A2, and A3 is 1.000, and the refraction of water W is based on the wavelength of 589 nm corresponding to the d-line of Na. The refractive index is 1.333, the refractive index of the light guide plate 91 is 1.490, and the refractive index of the light emitting sheet 101 is 1.550. The angle of light refraction and total reflection at the boundary surface also depends on the surface roughness at the boundary surface. Further, the angle of light refraction and total reflection at the boundary surface also depends on the value of the wavelength at which the refractive index decreases from a short wavelength to a long wavelength.

  Specifically, regarding the optical characteristics of the display device 4, in the schematic diagram relating to the optical characteristics of the display device 4 shown in FIG. 18, the light beams L22, L23, L24, L25, and L27 are the light beams L12, L13 shown in FIG. , L14, L15, and L17, respectively. Here, the light indicated by the light ray L <b> 22 is transmitted through the light emitting sheet 101, and is multiply reflected at the boundary surface between the water W and the light emitting sheet 101 and the boundary surface between the air A <b> 1 and the light emitting sheet 101. The light indicated by the light beam L23 is transmitted in the order of air A1, light emitting sheet 101, water W, and air A. Moreover, the light shown in the light ray L24 is transmitted in the order of the light emitting sheet 101, the water W, and the air A. Further, the light indicated by the light beam L25 passes through the air A1 and then enters the light guide plate 91 again. Further, the light indicated by the light beam L27 is transmitted in the order of air A1, light emitting sheet 101, water W, and air A.

  Similarly, regarding the optical characteristics of the display device 4, the light indicated by the light beam L <b> 31 passes through the light emitting sheet 101 and the water W, is totally reflected at the boundary surface between the air A and the water W, and passes through the light emitting sheet 101 again. Thereafter, the light is totally reflected at the boundary surface between the light emitting sheet 101 and the air A3. The light indicated by the light ray L32 is transmitted through the air A2, and then enters the light guide plate 91 again, and is totally reflected at the boundary surface between the air A1 and the light guide plate 91. The light indicated by the light ray L33 is totally reflected at the boundary surface between the air A2 and the convex portion 91h of the light guide plate 91, then passes through the air A1 and reenters the light guide plate 91, and then the air A3 and the light guide plate 91. Is totally reflected at the boundary surface with the convex portion 91h. The light indicated by the light beam L34 is totally reflected at the boundary surface between the air A1 and the light guide plate 91b, then passes through the air A2, and is totally reflected at the boundary surface between the light emitting sheet 101 and the air A2, and then the light guide plate 91. Is incident again. The light indicated by the light beam L35 is totally reflected at the boundary surface between the air A1 and the light guide plate 91 and the boundary surface between the air A3 and the light guide plate 91.

  Here, regarding the optical characteristics of the display device 4, in the schematic diagram related to the optical characteristics of the display device 4 shown in FIG. 18, the light emitting sheet 101 is provided and the concave portion 91 b formed in the light guide plate 91, and the concave portion 91 b There are many boundary surfaces through which light is totally reflected or refracted and transmitted by the convex portion 91h formed to protrude to the outer periphery. In particular, as shown in FIGS. 10 and 11, the display device 4 has a matrix shape in which the light emitting sheet 101 of the light emitting layer portion 100 is in contact with the convex portions 91 h formed in a matrix shape on the light guide plate 91 of the light guide portion 90. In this way, a circular air layer is formed. Specifically, when the light-emitting sheet 101 abuts on the convex portion 91h of the light guide plate 91, the light emitting sheet 101 also emits light at the boundary surfaces with the air A2 and the air A3 in addition to the boundary surfaces with the air A1 shown in FIG. Can be totally reflected or refracted. In addition, by increasing the height of the convex portion 91h of the light guide plate 91, the diameter of the portion of the light emitting sheet 101 that protrudes in a circular shape can be increased. Further, the light emitting sheet 101 is raised in a circular shape in contact with the convex portion 91h of the light guide plate 91, and is not bent in a state where an appropriate tension is applied at the raised portion, so that the light is totally reflected or refracted. easy. A light-emitting sheet 102 shown in FIG. 16 corresponds to a modification of the light-emitting sheet 101, and includes a base material 102a and an adhesive material 102b. The base material 102a is one main surface 21a of the light guide plate 91 via the adhesive material 102b. Or a part of the other main surface 21c. Further, since the convex portion 91h of the light guide plate 91 is formed so as to protrude from the one main surface 21a so as to surround the outer periphery of the concave portion 91b, the light emitting sheet 101 is attached when the light emitting sheet 101 is attached to the light guide plate 91. It is easy to form a space layer corresponding to the air A1 between 101 and the recess 91b. Furthermore, it is easy to form a space layer corresponding to the air A2 and A3 on the outer periphery of the convex portion 91h of the light guide plate 91.

  As described above, according to the display device 4 of the second embodiment, as in the display devices 1 to 3 of the first embodiment, at least a part of the display device is immersed in a liquid or in a state of touching the liquid. Even in this case, it can be sufficiently visually recognized as an even surface light source.

  Specifically, according to the display device 4 of the second embodiment, the space provided between the concave and convex portions of the light guide portion 90 and the light emitting layer portion 100, and the convex portions of the light guide portion 90. Light can be totally reflected or refracted in a space formed in the surroundings. Furthermore, light can be multiple-reflected at the boundary surface between the light emitting layer portion 100 and the water W and the boundary surface between the air A and the light emitting layer portion 100 enclosed in the concave portion of the light guide portion 90.

  Furthermore, according to the display device 4 of the second embodiment, at least a part of one main surface formed on one side of the light guide part 90 and at least the tip of the convex part, and the other formed on the other side of the light guide part 90. At least a part of the main surface and at least the tip of the convex part, or at least a part of one main surface and the other main surface formed on one and the other of the light guide 90 and at least the tip of the convex part are formed in close contact with each other. Light can be totally reflected or refracted at the interface. Specifically, when the light-emitting sheet 101 abuts on the convex portion 91h of the light guide plate 91, the light emitting sheet 101 also emits light at the boundary surfaces with the air A2 and the air A3 in addition to the boundary surfaces with the air A1 shown in FIG. Can be totally reflected or refracted. In addition, by increasing the height of the convex portion 91h of the light guide plate 91, the diameter of the portion of the light emitting sheet 101 that protrudes in a circular shape can be increased. Further, the light emitting sheet 101 is raised in a circular shape in contact with the convex portion 91h of the light guide plate 91, and is not bent in a state where an appropriate tension is applied at the raised portion, so that the light is totally reflected or refracted. easy. Further, since the convex portion 91h of the light guide plate 91 is formed so as to protrude from the one main surface 21a so as to surround the outer periphery of the concave portion 91b, the light emitting sheet 101 is attached when the light emitting sheet 101 is attached to the light guide plate 91. There is an effect of facilitating formation of a space layer corresponding to the air A1 between 101 and the recess 91b. Furthermore, there is an effect that it is easy to form a space layer corresponding to the air A2 and A3 on the outer periphery of the convex portion 91h of the light guide plate 91.

  Moreover, the manufacturing method of the light-guide plate of each light guide part provided in the display apparatus 1 thru | or the display apparatus 4 which concerns on this invention is demonstrated concretely.

  Ultrasonic processing, heating processing, cutting processing, laser processing, and molding processing can be used for the method of manufacturing the light guide plate. Hereinafter, each manufacturing method will be described. In ultrasonic processing, the main surface of the light guide plate is partially melted by using ultrasonic vibration of an ultrasonic processing horn brought into contact with the main surface of the light guide plate, thereby forming a recess in the main surface. To do. In the heat processing, the main surface of the light guide plate is partially melted using the heat of the processing tool brought into contact with the main surface of the light guide plate, thereby forming a recess in the main surface. Similarly, in the cutting process, the main surface of the light guide plate is partially scraped by using a cutting tool that is rotated or biased while being in contact with the main surface of the light guide plate, thereby forming a recess in the main surface. Similarly, in laser processing, the main surface of the light guide plate is partially melted by using the heat of the laser light condensed on the main surface of the light guide plate, thereby forming a recess in the main surface. Similarly, in the molding process, a shape reflecting the outer shape of the light guide plate to be molded is formed inside the mold, and the mold softened by heating is injected into the mold mounted on the injection molding machine. Then, the resin is cooled to form a recess in the main surface of the light guide plate. Moreover, you may add the fine particle-shaped diffusion member which emits diffused light to resin which is the base material of the light-guide plate used for a shaping | molding process. Similarly, a resin obtained by adding a particulate diffusion member that emits diffused light to a resin that is a base material of a light guide plate that performs the above-described ultrasonic processing, heating processing, cutting processing, or laser processing may be used. Note that the light guide plate may be formed by combining the above-described ultrasonic processing, heating processing, cutting processing, laser processing, and molding processing.

  Finally, the configurations and main effects of the display devices 1 to 3 according to the present invention will be specifically described for each claim.

  The display devices 1 to 3 according to claim 1 are display devices that are used in a state where at least a part thereof is immersed in or in contact with a liquid, and includes a light source unit 10 that emits light, and a light source unit 10. On the main surface of the light guide unit 20, 40, or 60, and the light guide unit 20, 40, or 60 having a recess formed on the main surface to derive the light emitted from the light source unit 10 as diffused light. A space is provided between the concave portion and the light emitting layer portion 30, 50, or 70 that transmits or reflects diffused light while being in close contact with each other.

  According to the display devices 1 to 3 described in claim 1 as described above, even when used in a state where at least a part is immersed in the liquid or in a state where the liquid is in contact with the liquid, the display device is sufficiently visually recognized as an even surface light source. be able to.

  The display device 1 to 3 according to claim 2 is dependent on claim 1 and is provided in a space provided between the concave portion of the light guide portion 20, 40, or 60 and the light emitting layer portion 30, 50, or 70. It is characterized in that a gas or a filler is enclosed.

  According to the display devices 1 to 3 described in claim 2, the light emitting unit 20, 40, or 60 and the light emitting unit 20, 40, or 60 emit light using air or nitrogen that is easily available and has a relatively low refractive index. Light can be totally reflected or refracted between the layer portions 30, 50, or 70. Further, the boundary surface between the light emitting layer portion 30, 50, or 70 and the water W, and the boundary between the air A enclosed in the concave portion of the light guide portion 20, 40, or 60 and the light emitting layer portion 30, 50, or 70. The light can be multiple-reflected at the surface.

  The display devices 1 to 3 according to a third aspect are dependent on the first aspect, and the light emitting layer portion 30, 50, or 70 is one main surface formed on one of the light guide portions 20, 40, or 60, It is in close contact with the other main surface formed on the other of the light guides 20, 40, or 60, or the one main surface and the other main surface formed on one and the other of the light guides 20, 40, or 60. It is characterized by.

  According to such display devices 1 to 3 according to claim 3, the light emitting layer portion 30, 50, or 70 and the one main surface formed on one of the light guide portions 20, 40, or 60, the light guide The other main surface formed on the other of the portions 20, 40, or 60, or the one main surface formed on one and the other of the light guide portions 20, 40, or 60 and the boundary formed in close contact with the other main surface At the surface, the light can be totally reflected or refracted.

  The display device 4 according to claim 4 is a display device that is used in a state where at least part of the display device is immersed in or in contact with a liquid, and is adjacent to the light source unit 10 that emits light and the light source unit 10. A light guide portion 90 formed on the main surface with a concave portion for guiding the light emitted from the light source unit 10 as diffused light and projecting from the main surface so that the convex portion surrounds the outer periphery of the concave portion. The light-emitting layer portion 100 has a light-emitting layer portion 100 that is in close contact with at least a part of the main surface and at least the tip of the convex portion and transmits or reflects diffused light while being separated from the concave portion of the light portion 90.

  According to the display device 4 described in the fourth aspect, even when used in a state where at least a part is immersed in the liquid or in a state where the liquid is in contact with the liquid, the display device 4 can be sufficiently used as an even surface light source with a simple configuration. It can be visually recognized by emitting light.

  The display device 4 according to a fifth aspect is dependent on the fourth aspect, and the space provided between the concave and convex portions of the light guide portion 90 and the light emitting layer portion 100 is formed in a circular shape. It is characterized by.

  According to the display device 4 as described above, the light can be refracted or totally reflected in the space provided between the concave portion of the light guide portion 90 and the light emitting layer portion 100. Further, according to the display device 4 according to claim 5, the light is refracted or totally reflected in the ring-shaped space provided between the outer periphery of the convex portion of the light guide portion 90 and the light emitting layer portion 100. Can be made. Specifically, when the light-emitting sheet 101 abuts on the convex portion 91h of the light guide plate 91, the light emitting sheet 101 also emits light at the boundary surfaces with the air A2 and the air A3 in addition to the boundary surfaces with the air A1 shown in FIG. Can be totally reflected or refracted. In addition, by increasing the height of the convex portion 91h of the light guide plate 91, the diameter of the portion of the light emitting sheet 101 that protrudes in a circular shape can be increased. Further, the light emitting sheet 101 is raised in a circular shape in contact with the convex portion 91h of the light guide plate 91, and is not bent in a state where an appropriate tension is applied at the raised portion, so that the light is totally reflected or refracted. easy.

  The display device 4 according to a sixth aspect is dependent on the fourth aspect, and includes spaces provided between the concave and convex portions of the light guide unit 90 and the light emitting layer unit 100, and the convex portions of the light guide unit 90. A feature is that gas or a filler is sealed in a space provided between the outer periphery and the light emitting layer portion 100.

  According to such a display device 4 according to claim 6, as shown in FIGS. 10 and 11, the light emitting sheet 101 of the light emitting layer portion 100 is formed in a matrix on the light guide plate 91 of the light guide portion 90. Since it comes into contact with the convex part and is raised in a circular shape in a matrix, it is provided between the concave part and convex part of the light guide plate 91 of the light guide part 90 and the light emitting sheet 101 of the light emitting layer part 100. In the space and the space provided between the outer periphery of the convex portion of the light guide plate 91 of the light guide portion 90 and the light emitting sheet 101 of the light emitting layer portion 100, the light can be totally reflected or refracted, respectively. Further, at the boundary surface between the light emitting sheet 101 of the light emitting layer unit 100 and the water W, and the boundary surface between the air A enclosed in the recess of the light guide plate 91 of the light guide unit 90 and the light emitting sheet 101 of the light emitting layer unit 100, Multiple reflections of light can be made.

  The display device 4 according to a seventh aspect is dependent on the fourth aspect, and the light emitting layer portion 100 includes at least a part of one main surface formed on one side of the light guide portion 90 and at least a tip of the convex portion, a light guide. At least a part of the other main surface formed on the other side of the part 90 and at least the tip of the convex part, or at least a part of the one main surface and the other main surface formed on one and the other side of the light guide part 90 and the convex part It is characterized by being in close contact with at least the tip.

  According to such a display device 4 of claim 7, the light guide 90 is formed on at least a part of one main surface formed on one side of the light guide part 90, at least the tip of the convex part, and on the other side of the light guide part 90. At least a part of the other main surface and at least the tip of the convex part, or at least a part of one main surface and the other main surface formed on one and the other of the light guide part 90 and at least the tip of the convex part are formed in close contact. The light can be totally reflected or refracted at the boundary surface.

  The display device 4 according to an eighth aspect is dependent on the fourth aspect, and the convex portion of the light guide portion 90 is formed so as to protrude from the main surface so as to increase each time the light guide portion 90 is separated from the light source portion 10. It is a feature.

  According to the display device 4 described in claim 8, uniform surface light emission is derived from the one main surface 92 a and the other main surface 92 c of the light guide plate 92 regardless of the distance from the side surface 92 e of the light guide plate 92. be able to.

  The display devices 1 to 4 according to claim 9 are dependent on claim 1 or 4 and are stacked on the light emitting layer portion 30, 50, 70, or 100 to display predetermined information and emit light from the light emitting layer portion. Further, the display unit 80 is further transmissive.

  According to such display devices 1 to 4 according to claim 9, in the display device 3 shown in FIG. 9, the display of the display unit 80 laminated on the light emitting sheet 71 of the light emitting layer unit 70 and displaying predetermined information. Since the plate 81 can sufficiently emit light, information including “◯ □ Δ” displayed on the display plate 81 can be sufficiently notified.

  The display devices 1 to 4 according to a tenth aspect are dependent on the first or fourth aspect, and the light emitting layer portion 30, 50, 70, or 100 is made of a base material and an adhesive material, and the base material has an adhesive material interposed therebetween. The light guide 20, 40, 60, or 90 is in close contact with the main surface.

  According to such display devices 1 to 4 according to claim 10, the base material is brought into close contact with the main surface of the light guide portion 20, 40, 60, or 90 by the adhesive material of the light emitting sheet of each light emitting layer portion. Can do.

  The display devices 1 to 4 according to an eleventh aspect are dependent on the first or fourth aspect, and the light guide section 20, 40, 60, or 90 and the light emitting layer section 30, 50, 70, or 100 are more liquid than the liquid. It is characterized by a high refractive index.

  According to the display devices 1 to 4 described in claim 11, the light guide unit 20, 40, 60, or 90 and the light emitting layer unit 30, 50, 70, or 100 emit light at the interface with the liquid. Can be totally reflected.

  The display devices 1 to 4 according to a twelfth aspect are dependent on the first or fourth aspect, and the concave portion of the light guide section 20, 40, 60, or 90 is formed of a dot shape, a line shape, or a combination thereof. It is characterized by.

  According to such display devices 1 to 4 described in claim 12, light having a predetermined light intensity distribution can be derived from the light guide unit 20, 40, 60, or 90.

  The display devices 1 to 4 according to a thirteenth aspect are dependent on the first or fourth aspect, and the light guide portion 20, 40, 60, or 90 and the light emitting layer portion 30, 50, 70, or 100 are refracted or bent. It is characterized by being.

  According to such display devices 1 to 4 according to claim 13, the light guide unit 20, 40, 60, or 90 and the light emitting layer units 30, 50, and 90, depending on the environment in which the display devices 1 to 4 are installed. 70 or 100 can be refracted or bent.

  The display devices 1 to 4 described in claim 14 are dependent on claim 1 or 4 and are characterized in that the light source unit 10 is not immersed in a liquid.

  According to the display devices 1 to 4 described in the fourteenth aspect, the light source unit 10 is bent by bending or bending the light guide unit 40 and the light emitting layer unit 50 as in the display device 2 shown in FIG. Can be used without being immersed in water.

  The display devices 1 to 4 according to claim 15 are dependent on claim 1 or 4, and the light source unit 10 is provided on one side or both sides of the side surface of the light guide unit 20, 40, 60, or 90. It is characterized by.

  According to such display devices 1 to 4 according to claim 15, the light source unit 10 is adjusted according to the degree to which the light of the light source unit 10 is attenuated inside the light guide unit 20, 40, 60, or 90. The light guide 20, 40, 60, or 90 can be provided on one side or both sides of the side surface.

  The display devices 1 to 4 according to a sixteenth aspect are dependent on the fifteenth aspect, and the concave portion of the light guide unit 20, 40, 60, or 90 is provided on one side of the side surface of the light guide unit 20, 40, 60, or 90. Alternatively, it is characterized in that it is formed on the main surface so as to become deeper every time it is separated from both sides.

  According to such display devices 1 to 4 described in claim 16, when the light of the light source unit 10 is incident from the side surface 22e of the light guide plate 22 of the light guide unit 20 shown in FIG. Although the amount of light propagating decreases each time it is separated from 22e, it is possible to suppress a decrease in the amount of diffused light generated in the recess even if it is separated from the side surface 22e of the light guide plate 22. Therefore, the light guide plate 22 of the light guide unit 20 shown in FIG. 5 is compared with the light guide plate 21 shown in FIG. 4, regardless of the distance from the side surface 22 e of the light guide plate 22. Uniform surface light emission is derived from the other main surface 22c.

  The display devices 1 to 4 according to claim 17 are dependent on claim 2 or 6, and the gas is air or nitrogen.

  According to such display devices 1 to 4 according to claim 17, the light is emitted from the recesses of the light guide 20, 40, or 60 using air or nitrogen that is easily available and has a relatively low refractive index. Light can be totally reflected or refracted between the layer portions 30, 50, or 70.

  The display device 1 to 4 according to claim 18 is dependent on claim 2 or 6, and the filler is from the light guide part 20, 40, 60, or 90 or the light emitting layer part 30, 50, 70, or 100. Is characterized by a low refractive index.

  According to such display devices 1 to 4 according to claim 18, light is totally reflected or refracted between the concave portion of the light guide portion 20, 40, or 60 and the light emitting layer portion 30, 50, or 70. Can be made.

1, 2, 3, 4, 1000 Display device 10, 1010 Light source 11 Light source 12 Substrate 13 Holding member 13a One surface 13b One end 13c Other end 14 Holding member lid 20, 40, 60, 90, 1020 91, 92, 1021, 1100, 1200 Light guide plates 21a, 22a, 41a, 61a, 91a, 92a, 1100a, 1200a One main surface 21b, 22b, 41b, 61b, 91b, 92b Recessed portions 21c, 22c, 41c, 61c, 91c , 92c Other main surfaces 21d, 22d, 41d, 61d, 91d, 92d Recesses 21e, 22e, 41e, 61e, 91e, 92e Side surfaces 91h, 91i, 92h, 92i Convex portions 30, 50, 70, 100 Light emitting layer portion 31, 32, 51, 71, 101, 102 Light emitting sheet 32a, 102a Base material 32b, 102b Adhesive 80 Display part 81 Display board A, A1, A2, A3 Air W Water L11, 12, L13, L14, L15, L16, L17, L18, L22, L23, L24, L25, L27, L31, L32, L33, L34, L35, L41, L42, L43, L44, L45, L46, L47, L48, L11e, 12e, L13e, L14e, L15e, L16e, L17e, L18e, L22e, L23e, L24e, L25e, L27e, L31e, L32e, L33e, L34e, L35e rays

Claims (18)

A display device used in a state where at least a part is immersed in a liquid or in a state of touching the liquid,
A light source that emits light;
A light guide section formed adjacent to the light source section and having a recess formed on a main surface thereof for guiding light emitted from the light source section as diffused light;
A display device comprising: a light emitting layer portion that is provided in a space between the concave portion and in close contact with the main surface of the light guide portion, and transmits or reflects the diffused light. The display device according to claim 1, wherein a gas or a filler is sealed in the space provided between the concave portion of the light guide portion and the light emitting layer portion. The light emitting layer portion is formed on one main surface formed on one side of the light guide unit, another main surface formed on the other side of the light guide unit, or the one main surface formed on one side and the other side of the light guide unit. The display device according to claim 1, wherein the display device is in close contact with a surface and the other main surface. A display device used in a state where at least a part is immersed in a liquid or in a state of touching the liquid,
A light source that emits light;
A recess is formed on the main surface adjacent to the light source unit, and the light irradiated from the light source unit is led out as diffused light, and the projection is formed to protrude from the main surface so as to surround the outer periphery of the recess. A light guide;
A space is provided between the concave portion and the convex portion and in contact with at least a part of the main surface of the light guide portion and at least the tip of the convex portion, and between the outer periphery of the convex portion. A display device comprising a light emitting layer portion provided with a space and transmitting or reflecting the diffused light. The display device according to claim 4, wherein the concave portion of the light guide portion and the space provided between the convex portion and the light emitting layer portion are formed in a circular shape. The space provided between the concave portion and the convex portion of the light guide portion and the light emitting layer portion, and the space provided between the outer periphery of the convex portion of the light guide portion and the light emitting layer portion. The display device according to claim 4, wherein a gas or a filler is sealed in the space. The light emitting layer part includes at least a part of one main surface formed on one side of the light guide part and at least a tip of the convex part, at least a part of another main surface formed on the other side of the light guide part, and the It is closely attached to at least a tip of a convex part or at least a part of the one main surface and the other main surface formed on one and the other of the light guide part and at least a tip of the convex part. Item 5. The display device according to Item 4. The display device according to claim 4, wherein the convex portion of the light guide portion is formed so as to protrude from the main surface so as to be higher each time the light guide portion is separated from the light source portion. The display device according to claim 1, further comprising a display unit that is stacked on the light emitting layer unit, displays predetermined information, and transmits light from the light emitting layer unit. The said light emitting layer part consists of a base material and an adhesive material, and the said base material is closely_contact | adhered to the said main surface of the said light guide part through the said adhesive material. The display device described. The display device according to claim 1, wherein the light guide section and the light emitting layer section have a higher refractive index than the liquid. The display device according to claim 1, wherein the concave portion of the light guide portion is formed of a dot shape, a line shape, or a combination thereof. The display device according to claim 1, wherein the light guide section and the light emitting layer section are refracted or bent. The display device according to claim 1, wherein the light source unit is not immersed in the liquid. The display device according to claim 1, wherein the light source unit is provided on one side or both sides of a side surface of the light guide unit. The display device according to claim 15, wherein the concave portion of the light guide portion is formed on the main surface so as to be deeper each time the light guide portion is separated from one side or both sides of the side surface of the light guide portion. . The display device according to claim 2, wherein the gas is air or nitrogen. The display device according to claim 2, wherein the filler has a refractive index lower than that of the light guide portion or the light emitting layer portion.