Abstract:
Provided are a display member and a display device capable of outputting bright and highly uniform light. Provided is a display member ( 10 ) comprising a light guiding member ( 11 ) which guides light outputted from a first light source ( 20 ); a light spreading part ( 13 ) which is provided on at least one side surface of the light guiding member ( 11 ) and spreads the light guided by the light guiding member ( 11 ); a design display part ( 12 ) which is provided on at least one surface side of the light guiding member ( 11 ) and displays a design; wherein the design display part ( 12 ) is provided with a first light transmissive outputting part ( 122 ) which transmits and outputs light that was spread by the light spreading part ( 13 ) and the light spreading part ( 13 ) is provided so as to correspond with the first light transmissive outputting part ( 122 ).

Description:
RELATED APPLICATIONS 
     This application is the U.S. National Phase under 35 U.S.C. §371 of International Application No. PCT/JP2011/059347, filed on Apr. 15, 2011, which in turn claims the benefit of Japanese Application No. 2010-110608, filed on May 12, 2010, the disclosures of which Applications are incorporated by reference herein. 
     TECHNICAL FIELD 
     The present invention relates to a display member and a display device. 
     BACKGROUND ART 
     As such a technology, for example, Patent Literatures 1 to 3 disclose a light guiding member provided with a sheet-like member having flexibility and light transmissive property and low refractive index portions arranged on both surfaces of the sheet-like member and having a refractive index of light lower than that of the sheet-like member. 
     CITATION LIST 
     Patent Literature 
     
         
         [PTL 1] Japanese Unexamined Patent Application Publication No. S51-73445 
         [PTL 2] Japanese Unexamined Patent Application Publication No. S52-87046 
         [PTL 3] Japanese Unexamined Patent Application Publication No. H04-232906 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     However, there is a problem that since the light guiding member disclosed in Patent Literatures 1 to 3 does not consider a design illuminated by light guided and outputted by the light guiding member, when a predetermined design is illuminated by the light guiding member, it is not possible to efficiently illuminate the design. 
     Therefore, the present invention has been achieved in view of the above-described problems, and an object thereof is to provide a display member and a display device, by which it is possible to efficiently illuminate a design. 
     Solution to Problem 
     A display member according to a first aspect of the present invention includes: 
     a light guiding member for guiding light outputted from a first light source; 
     a light spreading portion for spreading the light guided by the light guiding member, the light spreading portion being provided on at least one of the surface and the rear surface of the light guiding member; and 
     a design display portion for displaying a design, the design display portion being provided on at least one of the surface side and the rear surface side of the light guiding member, wherein 
     the design display portion includes: a first light transmissive outputting portion for transmitting and outputting the light spread by the light spreading portion, and 
     the light spreading portion is provided to correspond to the first light transmissive outputting portion. 
     Furthermore, a display device according to a second aspect of the present invention includes: 
     a first light source; 
     a light guiding member for guiding light outputted from the first light source; 
     a light spreading portion for spreading the light guided by the light guiding member, the light spreading portion being provided on at least one of the surface and the rear surface of the light guiding member; and 
     a design display portion for displaying a design, the design display portion being provided on at least one of the surface side and the rear surface side of the light guiding member, wherein 
     the design display portion includes: a first light transmissive outputting portion for transmitting and outputting the light spread by the light spreading portion, and 
     the light spreading portion is provided to correspond to the first light transmissive outputting portion. 
     Advantageous Effects of Invention 
     In accordance with the display member and the display device according to the present invention, since the design display portion is provided with the first light transmissive outputting portion for transmitting the light spread by the light spreading portion and the light spreading portion is arranged in an area corresponding to the first light transmissive outputting portion, output of light from an unnecessary part of the light guiding member is prevented or reduced, so that it is possible to efficiently illuminate the design displayed by the design display portion. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       [ FIG. 1 ]  FIG. 1  is an exploded perspective view of a display device according to an embodiment of the present invention. 
       [ FIG. 2 ]  FIG. 2  is a plan view when a design display portion according to the embodiment of the present invention is viewed from the front. 
       [ FIG. 3 ]  FIG. 3  is a plan view when a light spreading portion according to the embodiment of the present invention is viewed from the front. 
       [ FIG. 4 ]  FIG. 4  is a schematic sectional view of a display member according to the embodiment of the present invention. 
       [ FIG. 5 ]  FIG. 5  is a diagram illustrating a state in which light is outputted from a first light transmissive outputting portion of the design display portion according to the embodiment of the present invention. 
       [ FIG. 6 ]  FIG. 6(   a ) is a schematic sectional view of a display member according to a modification of the present invention, which has a light spreading portion arranged in an area corresponding to an area including a design portion, and  FIG. 6(   b ) is a schematic sectional view of a display member according to another modification of the present invention, which has a light spreading portion arranged in an area corresponding to an area not including a design portion (other than the design portion). 
       [ FIG. 7 ]  FIG. 7(   a ) is a diagram illustrating a state in which light is outputted from a first light transmissive outputting portion of the design display portion illustrated in  FIG. 6(   a ), and  FIG. 7(   b ) is a diagram illustrating a state in which light is outputted from a first light transmissive outputting portion of the design display portion illustrated in  FIG. 6(   b ). 
       [ FIG. 8 ]  FIG. 8(   a ) is a schematic sectional view of a display member according to another modification of the present invention, which has a light spreading portion arranged on a surface of a light guiding member, and  FIG. 8(   b ) is a schematic sectional view of a display member according to another modification of the present invention, which has light spreading portions arranged on both surfaces of a light guiding member. 
       [ FIG. 9 ]  FIG. 9  is a schematic sectional view of a display member according to another modification of the present invention, which has a light spreading portion larger than a first light transmissive outputting portion arranged. 
       [ FIG. 10 ]  FIG. 10  is a diagram illustrating a display member according to another modification of the present invention, wherein  FIG. 10(   a ) is a diagram illustrating an example of a light spreading portion provided with a high refractive index portion, and  FIG. 10(   b ) is a diagram illustrating another example of the light spreading portion provided with the high refractive index portion. 
       [ FIG. 11 ]  FIG. 11  is a schematic sectional view of a display member according to another modification of the present invention, which has a light spreading portion directly formed in a light guiding member. 
       [ FIG. 12 ]  FIG. 12  is a schematic sectional view of a display member according to another modification of the present invention, which has a low refractive index portion arranged in an area corresponding to an area other than a first light transmissive outputting portion. 
       [ FIG. 13 ]  FIG. 13  is a schematic sectional view of a display member according to another modification of the present invention, which has a design portion arranged in an area of a light transmissive outputting portion and having a light transmissive property. 
       [ FIG. 14 ]  FIG. 14  is a schematic sectional view of a display member according to another modification of the present invention, which is provided with a design display portion on both surface sides of a light guiding member. 
       [ FIG. 15 ]  FIG. 15  is a diagram illustrating a state in which light is outputted from a first light transmissive outputting portion of the design display portion illustrated in  FIG. 14 . 
       [ FIG. 16 ]  FIG. 16  is a schematic sectional view of a display member according to another modification of the present invention, which illustrates the display member three-dimensionally formed. 
       [ FIG. 17 ]  FIG. 17  is an exploded perspective view of a display device according to another modification of the present invention, which is provided with a display member serving as an operation button of a cellular phone. 
       [ FIG. 18 ]  FIG. 18  is a schematic sectional view of the display device illustrated in  FIG. 17 . 
       [ FIG. 19 ]  FIG. 19  is an exploded perspective view of a display device according to another modification of the present invention, which is provided with a design display portion having a second light transmissive outputting portion. 
       [ FIG. 20 ]  FIG. 20  is a schematic view of the display device illustrated in  FIG. 19 , which illustrates a path of light outputted respectively from a first light source and a second light source. 
       [ FIG. 21 ]  FIG. 21  is a diagram of the display device illustrated in  FIG. 19 , which illustrates a state in which light is outputted from the first light transmissive outputting portion and the second light transmissive outputting portion of the design display portion. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a display member and a display device according to an embodiment of the present invention will be described based on  FIG. 1  to  FIG. 3 . 
     A display device  100  includes a display member  10  that displays a predetermined design, and a first light source  20  that outputs light. 
     In the display device  100 , the light outputted from the first light source  20  is received in an end portion of the display member  10 , and is outputted from a predetermined area of the display member  10 . Specifically, the display device  100 , for example, is used in a vehicle meter, a cellular phone, a display and the like. In the present embodiment, the display device  100  is used in the vehicle meter. 
     The first light source  20  is a rod-like light source that straightly outputs light, and is provided to allow the outputted light to be incident into the display member  10  (a light guiding member  11  which will be described later). Specifically, the first light source  20 , for example, is provided such that a light outputting portion of the first light source  20  faces the side surface of the display member  10  (the light guiding member  11  which will be described later). The light outputted from the first light source  20  is incident into the light guiding member  11  from the side surface of the light guiding member  11  which will be described later. The first light source  20 , for example, includes a light emitting element such as a cold cathode tube, a light emitting diode, or an organic EL element. 
     The display member  10  includes the light guiding member  11 , a design display portion  12 , a light spreading portion  13 , a first low refractive index portion  14   a , and a second low refractive index portion  14   b.    
     The light guiding member  11  guides the light outputted from the first light source  20 . Here, the light guiding member  11  is a member (for example, a polycarbonate plate) made of flat-like synthetic resin having a light transmissive property (including a light translucent property) such as transparency and translucency. Specifically, the light guiding member  11  is formed using polycarbonate-based resin (a refractive index of light is about 1.6), acryl-based resin (a refractive index of light is about 1.49), silicon-based resin (a refractive index of light is about 1.5), and the like. The light guiding member  11  receives light, which is outputted from the first light source  20 , at a side (a surface facing the first light source  20 ) thereof, and guides the received light (the light incident from the side to the inside). 
     The design display portion  12  is provided at a side of a surface  111  of the light guiding member  11 . The design display portion  12 , for example, is formed by printing, coating and the like using ink and the like, and serves as a display layer for displaying a design. The design display portion  12  is provided with a design portion  121  that represents a design for expressing a character, a picture, a diagram, a symbol and the like. Moreover, the design display portion  12  is provided at a part thereof with a first light transmissive outputting portion  122  that transmits and outputs light spread by a light spreading portion  13  which will be described later. When the design display portion  12  is illuminated, the design display portion  12  displays a predetermined design by the design portion  121  and the first light transmissive outputting portion  122 . The design portion  121  forms a design, which is obtained by cutting out a part of “an index portion of a vehicle meter (a speedometer)”, using a non-light transmissive (a light blocking) layer. The design display portion  12  is provided at a part thereof with a light transmissive area by a material, which is used in the arrangement of the design portion  121  or the design portion  121 , and the like, and the first light transmissive outputting portion  122  is provided in at least a part of the area as an actual light transmissive area of the area. That is, the design display portion  12  is divided into an area through which light is actually outputted, and an area through which light is not outputted. The light outputting area is only the first light transmissive outputting portion  122  provided at a partial area of the design display portion  12 . Meanwhile, an area from which light is not outputted (the light non-outputting area) corresponds to an area where the light-blocking design portion  121  is provided, an area of the light transmissive area, where the light spread by the light spreading portion  13  is not outputted because the light does not reach the design display portion  12 , and the like. In this way, in the light guiding member  11 , output of light from an unnecessary part of the light guiding member  11  is prevented or reduced, so that it is possible to efficiently illuminate the design displayed by the design display portion  12 . In  FIG. 1  and  FIG. 2 , the first light transmissive outputting portion  122  is a through hole (may be appropriately changed to a notch, and hereinafter, which is the same for a through hole) formed in a part of the index portion of the speedmeter. Here, the first light transmissive outputting portion  122  is formed by cutout picture printing and the like. Furthermore, since it is sufficient if the first light transmissive outputting portion  122  allows the light spread by the light spreading portion  13  to pass therethrough, the first light transmissive outputting portion  122  is formed, for example, by white printing having light transmissive property. 
     The light spreading portion  13  is provided on the rear surface  112  of the light guiding member  11 . The light spreading portion  13  spreads the light guided by the light guiding member  11 . The light spread by the light spreading portion  13  passes through the first light transmissive outputting portion  122  and is outputted from the first light transmissive outputting portion  122 . The light spreading portion  13  is formed on the rear surface  112  of the light guiding member  11  by printing, coating and the like using a light spreading material. The light spreading portion  13  is provided in an area corresponding to the first light transmissive outputting portion  122  of the design display portion  12 . For example, at least a part (here, the whole) of the light spreading portion  13  is provided to overlap the whole of the first light transmissive outputting portion  122  when viewed from the normal direction (that is, here, the normal direction with respect to the surface of the light spreading portion  13 ) on the surface of the design display portion  12  (when viewed from the top, as viewed in  FIG. 4 ). 
     Here, the light spreading portion  13  is a light spreading film (sheet)-like member, and is provided to correspond to the first light transmissive outputting portion  122  of the rear surface  112  of the light guiding member  11 . Furthermore, the light spreading portion  13  is provided at approximately the same position as that of the first light transmissive outputting portion  122  with approximately the same shape as that of the first light transmissive outputting portion  122 . With such a configuration, it is possible to provide the light spreading portion  13  without a complicated design. In addition, the spreading described herein appropriately includes a change in the course of light due to diffused reflection, scattering, refraction, reflection and the like. 
     Furthermore, the spreading property of the light spreading portion  13  is appropriately changed according to a positional relation between the first light transmissive outputting portion  122  and the light guiding member  11 . For example, as illustrated in  FIG. 4 , when the design display portion  12  is positioned at the side of the surface  111  of the light guiding member  11  and the light spreading portion  13  is formed on the rear surface  112  of the light guiding member  11 , the light spreading portion  13  mainly spreads light by reflection, diffused reflection, scattering and the like. Furthermore, for example, as illustrated in  FIG. 8(   a ), when the design display portion  12  is positioned at the side of the surface  111  of the light guiding member  11  and the light spreading portion  13  is formed on the surface  111  of the light guiding member  11 , the light spreading portion  13  mainly spreads light by scattering, refraction and the like. As described above, the spreading property of the light spreading portion  13  is changed according to whether light to be spread is allowed to travel toward the surface or the rear surface (or including both directions). In addition, when the light to be spread is allowed to travel in both directions of the surface or the rear surface, the light spreading portion  13  appropriately performs diffused reflection, scattering, refraction, reflection and the like. 
     The first low refractive index portion  14   a  and the second low refractive index portion  14   b  are provided to cover both surfaces  111  and  112  (appropriately, including the light spreading portion  13 ) of the light guiding member  11  throughout the whole of the both surfaces  111  and  112  of the light guiding member  11  while interposing the light guiding member  11  therebetween. The first low refractive index portion  14   a  and the second low refractive index portion  14   b  have a light transmissive property (including a light translucent property) such as transparency and translucency, and have a refractive index of light lower than that of the light guiding member  11 . The first low refractive index portion  14   a  and the second low refractive index portion  14   b , for example, are formed by printing, coating and the like using synthetic resin having a refractive index of light lower than that of the light guiding member  11 . The first low refractive index portion  14   a  and the second low refractive index portion  14   b  may be provided by a member (for example, an acryl plate) made of flat-like synthetic resin having a light transmissive property. 
     Specifically, the first low refractive index portion  14   a  and the second low refractive index portion  14   b  are formed by acryl-based resin (a refractive index of light is about 1.49), silicon-based resin (a refractive index of light is about 1.5), tetrafluoroethylene or polytetrafluoroethylene (a kind of polyethylene, a refractive index of light is about 1.35), and the like. In addition, the first low refractive index portion  14   a  and the second low refractive index portion  14   b  may be formed by materials different from each other. 
     At an interface between the first low refractive index portion  14   a  and the light guiding member  11  or an interface between the second low refractive index portion  14   b  and the light guiding member  11 , the light guided by the light guiding member  11  is totally reflected. The total reflection is a phenomenon that when light is allowed to be incident from a medium (the light guiding member  11 ) having a large refractive index to media (the low refractive index portions  14   a  and  14   b ) having a small refractive index, the whole (appropriately including approximately the whole) of the light to be incident is reflected without passing through the interface. The total reflection occurs when an incidence angle of light is larger than an angle (a critical angle) determined by each refractive index of adjacent media (here, the light guiding member  11 , the first low refractive index portion  14   a , and the second low refractive index portion  14   b ). Since most of light incident from a side surface of the light guiding member  11  reaches the first low refractive index portion  14   a  or the second low refractive index portion  14   b  at an incidence angle larger than the critical angle, light having reached at the interface between the light guiding member  11  and the low refractive index portion  14  is totally reflected. 
     In the display device  100  configured as above, as illustrated in  FIG. 4 , the light outputted from the first light source  20  is incident into the side surface of the light guiding member  11  of the display member  10 . The light incident into the light guiding member  11  is repeatedly totally reflected at the interface between the light guiding member  11  and the first low refractive index portion  14   a  or at the interface between the light guiding member  11  and the second low refractive index portion  14   b , and travels the inside of the light guiding member  11 . In this way, the light guiding member  11  guides the light outputted from the first light source  20 . In addition, a straight arrow illustrated in  FIG. 4  represents the direction of the light traveling the inside of the light guiding member  11 . A part of the light traveling the inside of the light guiding member  11  reaches the light spreading portion  13 . The light having reached the light spreading portion  13  is spread by the light spreading portion  13 . In addition, dotted arrows illustrated in  FIG. 4  represent the traveling directions of the light spread by the light spreading portion  13 . Of the light spread by the light spreading portion  13 , light having an incidence angle to the surface  111  of the light guiding member  11 , which is smaller than the critical angle, passes through the first light transmissive outputting portion  122  (here, the through hole) of the design display portion  12  through the first low refractive index portion  14   a  without being totally reflected. In this way, in the design display portion  12 , the light is outputted from the first light transmissive outputting portion  122  (here, the part of the index portion of the speedometer) formed by the through hole as illustrated in  FIG. 5 . Consequently, the design portion  121  is darkly viewed and the first light transmissive outputting portion  122  is brightly viewed. 
     So far, in accordance with the display member  10  and the display device  100  according to the present embodiment, since the light spreading portion  13  is provided in an area corresponding to the first light transmissive outputting portion  122  provided as an area through which light actually passes in the design display portion  12 , the light spread by the light spreading portion  13  transmits the first light transmissive outputting portion  122  and is outputted. In this way, in the light guiding member  11 , output of light from an unnecessary part of the light guiding member  11  is prevented or reduced, so that it is possible to efficiently illuminate the design displayed by the design display portion  12 . Particularly, as compared with a conventional case using a display member in which light is outputted from nearly the entire surface of a light guiding member, the luminance (the luminance of the lightened part) of the light outputted from the first light transmissive outputting portion  122  is high, so that it is possible to efficiently illuminate the design displayed by the design display portion  12 . 
     Furthermore, in the embodiment, even when the same design portions  121  are provided in the design display portion  12 , the first light transmissive outputting portion  122  is changed and the light spreading portion  13  is provided in an area corresponding to the first light transmissive outputting portion  122 , so that it is possible to give a different impression on a person viewing the display device  100  when the design display portion  12  is illuminated. For example, as illustrated in  FIG. 6(   a ) and  FIG. 6(   b ), the design display portion  12  is provided with the same design portions  121 , but the first light transmissive outputting portions  122  are provided as different areas and the light spreading portions  13  are provided in areas corresponding to the first light transmissive outputting portions  122 , so that it is possible to give a different impression on a person viewing the display device  100  when the design display portion  12  is illuminated as illustrated in  FIG. 7(   a ) and  FIG. 7(   b ) (the same design portions  121  are provided and only the positions of the light spreading portions  13  are different from each other in  FIG. 7(   a ) and  FIG. 7(   b )). 
     Furthermore, in the embodiment, the design display portion  12  is provided at the surface side of the light guiding member  11  through the first low refractive index portion  14   a . In this way, the light guided by the light guiding member  11  is totally reflected at the interface between the light guiding member  11  and the first low refractive index portion  14   a , so that the light is prevented from being absorbed by the design display portion  12 . Consequently, the light guiding efficiency of the light guiding member  11  is ensured. That is, when the design display portion  12  is provided on the surface  111  or the rear surface  112  of the light guiding member  11 , it is preferable that the design display portion  12  is provided through the first low refractive index portion  14   a  or the second low refractive index portion  14   b.    
     In addition, even when the first low refractive index portion  14   a  and the second low refractive index portion  14   b  are not provided on both surfaces of the light guiding member  11 , since the air has a refractive index of light lower than that of the light guiding member  11 , the light guided by the light guiding member  11  is totally reflected at the interface between the light guiding member  11  and the air. 
     However, for example, when a medium (for example, dust) having a refractive index higher than that of the light guiding member  11  has adhered to the surface of the light guiding member  11 , or when the surface of the light guiding member  11  has been damaged, light may pass through or may be absorbed at that part, resulting in a reduction of the light guiding efficiency of the light guiding member  11 . That is, the first low refractive index portion  14   a  and the second low refractive index portion  14   b  are provided respectively on both surfaces of the light guiding member  11 , so that light can be nearly totally reflected at the interface between the first low refractive index portion  14   a  and the light guiding member  11  or at the interface between the second low refractive index portion  14   b  and the light guiding member  11 , resulting in the improvement of the light guiding efficiency, as compared with a case in which the first low refractive index portion  14   a  and the second low refractive index portion  14   b  are not provided. 
     Furthermore, in the embodiment, the light spreading portion  13  is provided close to the light guiding member  11  and then the second low refractive index portion  14   b  is provided on the light spreading portion  13  (at a lower position, as viewed in  FIG. 4 ). In this way, guided light is spared by the light spreading portion  13 . 
     The contents described in the embodiment are intended for embodying the technology according to the present invention, and do not limit the technical scope of the present invention. The technical contents of the present invention can be variously modified within the scope of the claims. Hereinafter, modifications of the present embodiment will be described with reference to  FIG. 6  to  FIG. 21 . In addition, the technical matters described above or in the following modifications may be appropriately combined with each other. 
     Furthermore, in the embodiment, the light spreading portion  13  is provided on the rear surface  112  of the light guiding member  11 . However, it is sufficient if the light spreading portion  13  is arranged in an area corresponding to the first light transmissive outputting portion  122 . As illustrated in  FIG. 8(   a ), the light spreading portion  13  may be provided on the surface  111  of the light guiding member  11 , or as illustrated in  FIG. 8(   b ), the light spreading portion  13  may be provided on both surfaces  111  and  112  thereof. In addition, as described above, the property of the light spreading portion  13  may be changed according to the positions thereof. 
     Furthermore, the light spreading portion  13  may be larger than the first light transmissive outputting portion  122 . For example, the light spreading portion  13  may have a width wider than that of the first light transmissive outputting portion  122 . Furthermore, the light spreading portion  13  may have a shape similar to and be larger than the first light transmissive outputting portion  122 . In this way, even when the light spreading portion  13  is provided at a position shifted from the first light transmissive outputting portion  122  (that is, a position out of an area corresponding to the first light transmissive outputting portion  122 ), it is possible to spread light toward the first light transmissive outputting portion  122  and it is possible for the first light transmissive outputting portion  122  to efficiently output the light spread by the light spreading portion  13 . 
     Furthermore, a viewing angle of the first light transmissive outputting portion  122  (a lightened part) becomes wide. 
     Furthermore, the light spreading portion  13  may be provided with a high refractive index portion  131  having a refractive index of light higher than that of the light guiding member  11 . When the light spreading portion  13  is viewed from the normal direction with respect to the surface of the light spreading portion  13  (when the light spreading portion  13  is viewed from the top in  FIG. 10 ), the high refractive index portion  131  is provided in an area of at least a part of the light spreading portion  13  as illustrated in  FIG. 10(   a ), or is provided on one surface of the light spreading portion  13  as illustrated in  FIG. 10(   b ). Furthermore, the high refractive index portion  131  is provided to make contact with the surface of the light guiding member  11 . In this way, light having reached the light spreading portion  13  passes through (is refracted) at the interface between the light guiding member  11  and the high refractive index portion  131 , so that it is possible to increase the amount of the light spread by the light spreading portion  13 . Furthermore, the luminance (the luminance of the lightened part) of the light outputted from the first light transmissive outputting portion  122  is higher as compared with the light spreading portion  13  not provided with the high refractive index portion  131 , so that it is possible to more efficiently illuminate the design displayed by the design display portion  12 . Specifically, the high refractive index portion  131  is formed using polycarbonate-based resin (a refractive index of light is about 1.6), polyurethane-based resin (a refractive index of light is about 1.6), and the like. 
     Furthermore, it is sufficient if the light spreading portion  13  has a light transmissive property. For example, as illustrated in  FIG. 10 , the light spreading portion  13  may be obtained by directly forming a dotted pattern and the like, which include a concave-convex part and the like, on the surface of the light guiding member  11  through microdot, imprint, etching and the like. Furthermore, the light spreading portion  13  may be obtained by providing a bubble having a light spreading property on the surface of the light guiding member  11  having a light transmissive property. In these cases, the light spreading portion  13  may be made of the same material as that of the light guiding member  11 . Alternatively, the light guiding member  11  and the light spreading portion  13  may be configured by mixing gold powder and the like having a light spreading property into glass having a light transmissive property. 
     Furthermore, in the embodiment, the first low refractive index portion  14   a  and the second low refractive index portion  14   b  are provided throughout the whole of both surfaces  111  and  112  of the light guiding member  11 . However, as illustrated in  FIG. 12 , the first low refractive index portion  14   a  may be formed with a through hole  141  at a position through which the light spread by the light spreading portion  13  passes. In this way, the first low refractive index portion  14   a  and the second low refractive index portion  14   b  may be provided such that a position corresponding to the first light transmissive outputting portion  122  becomes a through hole. 
     Furthermore, in the embodiment, the design portion  121  formed in the design display portion  12  is a layer having a non-light transmissive property (a light blocking property). However, the design portion  121  may be a layer having a light transmissive property (including a light translucent property). Moreover, the design portion  121  formed using the layer having a light transmissive property may be provided to cover the first light transmissive outputting portion  122  as illustrated in  FIG. 13 . In such a case, in the design display portion  12 , a part, through which the light spread by the light spreading portion  13  passes, is the first light transmissive outputting portion  122  (refer to arrows illustrated in  FIG. 13 ). That is, the first light transmissive outputting portion  122  may be defined by the shape and the like of the light spreading portion  13 . In addition, since the range of the first light transmissive outputting portion  122  provided in such a case is a range in which the light spread by the light spreading portion  13  reaches and passes therethrough, the range of the first light transmissive outputting portion  122  becomes wide as compared with the case in which the design portion  121  having a light blocking property in the embodiment is provided (refer to  FIG. 5 ). 
     Furthermore, as illustrated in  FIG. 14  and  FIG. 15 , the design display portion  12  may be provided at sides (both surfaces of the display member  10 ) of both surfaces  111  and  112  of the light guiding member  11 , and may display a design by forming a plurality of design portions  121   a  and  121   b . Furthermore, the amount, by which the light spread by the light spreading portion  13  arranged in an area corresponding to the first light transmissive outputting portion  122  provided in the design display portion  12  passes through the first light transmissive outputting portion  122 , is adjusted by the design portions  121   a  formed in the design display portion  12 , so that it is possible to display a design formed in the design display portion  12 . For example, the design portions  121   a  are allowed to have gradation and the like, and then the amount, by which light passes through the first light transmissive outputting portion  122 , is adjusted. In this way, it is possible to display a fresh design (refer to  FIG. 15 ). 
     Moreover, in the embodiment, the display member  10  has a flat shape. However, as illustrated in  FIG. 16 , the display member  10  may be in a three-dimensional shape. For example, the display member  10  may be formed in a three-dimensional shape through air pressure molding, drawing molding and the like. In addition, a three-dimensional light guiding member  11  may be used, and the design display portion  12 , the light spreading portion  13 , the low refractive index portion  14  and the like may be stacked on the light guiding member  11 , thereby configuring a three-dimensional display member  10 . Furthermore, for example, as illustrated in  FIG. 17  and  FIG. 18 , a part of the display member  10  may be allowed to have a shape of an operation button of a cellular phone, and the part of the display member  10 , the first light source  20 , and a circuit board  40  are accommodated in a case body  30 , thereby configuring the display device  100  (here, the cellular phone). A switch portion  41  is provided at a position on the circuit board  40 , which corresponds to the design portion  12  forming the operation button of the display member  10 . When the design portion  12  is pressed, a part of the display member  10  deformed at the pressed portion makes contact with the switch portion  41  and current is applied to the first light source  20  connected to the circuit board  40 , so that light is outputted from the first light source  20 . In the same manner as above, the light outputted from the first light source  20  travels through the light guiding member  11 , is spread by the light spreading portion  13  provided in the display member  10 , and then is outputted from the first light transmissive outputting portion  122  provided in the design display portion  12 . Consequently, it is possible to efficiently illuminate a design (a design on the operation button). 
     Furthermore, in addition to the configuration of the display device  100  in the embodiment, as illustrated in  FIG. 19  and  FIG. 20 , the design display portion  12  may be provided with a second light transmissive outputting portion  122   b  (an alert portion) obtained by cutting out the “alert portion” from the design portion  121 . Furthermore, an additional light source  50  (a second light source  50 ) separately from the first light source  20  may be provided at a side (the rear surface of the display member  10 ) of the rear surface  112  of the light guiding member  11  while facing the second light transmissive outputting portion  122   b . The second light source  50  is arranged in an area overlapping the second light transmissive outputting portion  122   b  when viewed from the normal direction of the surface of an area where the second light transmissive outputting portion  122   b  is provided. In addition, the first low refractive index portion  14   a  is provided with a second notch portion  141   b . However, the second notch portion  141   b  may not be formed. 
     In the display device  100  configured as above, as illustrated in  FIG. 20 , light outputted from the second light source  50  passes through the second low refractive index portion  14   b , the light guiding member  11 , and the second through hole  141   b , and then passes through the second light transmissive outputting portion  122   b  of the design display portion  12 . In this way, as illustrated in  FIG. 21 , the design display portion  12  outputs the light spread by the light spreading portion  13  from the light transmissive outputting portion  122   a , and further allows the light outputted from the second light source  50  to pass through the light transmissive outputting portion  122   b  (the alert portion). Since the light outputted from the light transmissive outputting portion  122   b  is the light directly outputted from the second light source  50  and is not spread or reflected, it is possible to output light with high luminance from the light transmissive outputting portion  122   b . Consequently, since the light transmissive outputting portion  122   b  is brightly lightened, it is possible to attract the attention of a user. 
     INDUSTRIAL APPLICABILITY 
     The present invention is available for a display device that displays various types of information in a vehicle and the like. 
     REFERENCE SIGNS LIST 
       10  Display Member 
       11  Light Guiding Member 
       12  Design display portion 
       13  Light Spreading Portion 
       14   a  First Low Refractive Index Portion 
       14   b  Second Low Refractive Index Portion 
       20  First Light Source 
       50  Second Light Source 
       100  Display Device 
       111  Surface of Light Guiding Member 
       112  Rear Surface of Light Guiding Member 
       121  Design Portion 
       122 , 122   a  First Light Transmissive Outputting Portion 
       122   b  Second Light Transmissive Outputting Portion 
       131  High Refractive Index Portion 
       141  Through Hole 
       141   a  First Through Hole 
       141   b  Second Through Hole