Patent Publication Number: US-2009229153-A1

Title: Display Device

Description:
TECHNICAL FIELD 
     The present invention relates to a display device, and more particularly, to a display device for displaying in three dimensions an object to be displayed such as a character and a graphic, or alternatively for performing display with a feeling of depth. 
     BACKGROUND ART 
     Patent Document 1 discloses a display device for displaying in three dimensions a mark composed of a character, a graphic, or the like by using a surface light source of white. A mark is drawn with a transparent colored light transmitting layer on the front surface of a transparent flat plate member, while a mask in which the shape of the mark is punched is provided on the rear surface. Then, white light is projected from the rear side of the mask by an electroluminescence apparatus (hereinafter, referred to as “EL apparatus”) serving as a surface light source. Because an image formed by the light having passed through the punching portion of the mask and an image formed by the light having been transmitted through the colored light transmitting layer are shifted to each other, the mark is seen in a state of coming up in three dimensions. 
     [Patent Document 1] Japanese Utility Model Application Laid-open No. Hei 04-114083 
     DISCLOSURE OF THE INVENTION 
     Problems to be solved by the Invention 
     Nevertheless, in the display device of Patent Document 1, because a mark is drawn with a colored light transmitting layer on the front surface of a transparent flat plate member, the mark is always seen regardless of the emission/non-emission of light from the EL apparatus. This has caused a problem that the appearance especially at the time of non-emission of light is not satisfactory. 
     Further, a complicated configuration is employed that a colored light transmitting layer for drawing a mark and a mask in which the shape of the mark is punched are arranged on the two faces of a flat plate member. Furthermore, the positions of the colored light transmitting layer and the mask need be aligned to each other. This has caused a problem of a large amount of labor hour in manufacturing. 
     The present invention has been made in order to solve these problems in the related art. An object of the present invention is to provide a display device which displays in three dimensions a design serving as an object to be displayed at the time of light emission and still has satisfactory appearance even at the time of non-emission of light, and has a simple configuration and hence can easily be manufactured. 
     Means for Solving the Problems 
     A display device according to the present invention includes an image forming apparatus which has a reflecting layer on a rear surface side thereof and emits light to a front surface side thereof to form an image of a design to be displayed, in which a transparent member is arranged on the front surface side of the image forming apparatus and, further, a half mirror layer is arranged on a front surface side of the transparent member. 
     Here, in the specification of the present invention, a “image of a design” includes a character, a graphic, a symbol, an image, a pattern, and a combination of two or more of these. 
     An image forming apparatus can be constructed from: a mirror type surface light-emission apparatus which has a reflecting layer on the rear surface side and emits light from the front surface; and a design construction layer which is arranged on the front surface side of this surface light-emission apparatus and in which a design to be displayed. Here, the surface light-emission apparatus may be constructed from an EL apparatus including: a reflection electrode layer which forms a reflecting layer; a transparent electrode layer; and a light emitting layer which is interposed between these reflection electrode layer and transparent electrode layer. Here, in the specification of the present invention, the surface light-emission apparatus may have a planar shape or a curved surface shape. Alternatively, a planar shape and a curved surface shape may be combined in accordance with the shape of a design. 
     Further, the design construction layer may be formed from: a reflection film which is patterned in correspondence with the shape of a design to be displayed and has a light blocking property; or a light transmitting film patterned in correspondence with the shape of a design to be displayed. Specifically, a mirror-like masking sheet may be arranged on the front surface of the surface light-emission apparatus or on the rear surface of the transparent member, or alternatively a thin film may be formed by at least one method selected from vapor deposition, plating, plating-appearance hot stamping, and printing, so a design construction layer may be obtained. Here, when the design construction layer is formed from a light-blocking reflection film, a monochromatic design can be expressed clearly. This approach is effective especially when characters are desired to be expressed clearly. Further, when the design construction layer is formed from a light transmitting film (multicolor printing, a multicolor film, or a combination of monochrome films of different colors may be employed), a multicolor design can be expressed. 
     Further, an image forming apparatus can be constructed from a mirror type display which has a reflecting layer on the rear surface side and which emits light in a pattern corresponding to a design to be displayed. Here, the display may be constructed from an EL apparatus having: a reflection electrode layer which forms a reflecting layer; a transparent electrode layer; and a light emitting layer which is interposed between these reflection electrode layer and transparent electrode layer. 
     In this case, the EL apparatus is preferable to be of any one of the following methods: 
     (1) at least one of the transparent electrode layer or the light emitting layer is patterned in correspondence with the shape of a design to be displayed; 
     (2) an insulating layer which is interposed between the reflection electrode layer and the transparent electrode layer and which is patterned in correspondence with the shape of a design to be displayed is provided; 
     (3) segment display of a design to be displayed is performed; and 
     (4) dot matrix display of a design to be displayed is performed. 
     Here, the emission color of the EL apparatus may be monochrome or multicolor. When light is emitted in a plurality of colors, the emission colors may be fixed, or alternatively the emission colors may vary. 
     The display device according to the present invention is preferable to be installed in the cabin of a vehicle. In particular, this apparatus may be installed in a scuff plate or an inside door handle of a vehicle. 
     EFFECT OF THE INVENTION 
     According to the present invention, a design to be displayed can be displayed in multiple without a loss of the design. Thus, a display device which can display a design in three dimensions at the time of light emission and still has satisfactory appearance at the time of non-emission of light can be realized in a simple configuration. Further, this display device can be manufactured easily. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing a state of a display device of an audio cover at the time of light emission according to Embodiment 1. 
         FIG. 2  is a sectional view taken along line A-A of  FIG. 1 . 
         FIG. 2   a  is a sectional view showing a structure of a display device according to a modification of Embodiment 1. 
         FIG. 3  is a sectional view showing a structure of a display device according to Embodiment 2. 
         FIG. 4  is a sectional view showing a structure of a display device according to Embodiment 3. 
         FIG. 4   a  is a sectional view showing a structure of a display device according to a modification of Embodiment 3. 
         FIG. 5  is a sectional view showing a structure of a display device according to Embodiment 4. 
         FIG. 6  is a sectional view showing a structure of a display device according to Embodiment 5. 
         FIG. 7  is a sectional view showing a structure of a display device according to Embodiment 6. 
         FIG. 8  is a sectional view showing a structure of a display device according to Embodiment 7. 
         FIG. 8   a  is a sectional view showing a structure of a display device according to a modification of Embodiment 7. 
         FIG. 9  is a perspective part view showing a cabin of a vehicle in which a display device of the present invention is applied to a scuff plate and an inside door handle. 
         FIG. 10  is a perspective view showing a clock to which a display device of the present invention is applied. 
     
    
    
     BEST MODE OF CARRYING OUT THE INVENTION 
     Embodiments of the present invention are described below with reference to the accompanying drawings. 
     Embodiment 1 
       FIG. 1  is a perspective view showing the state of a display device provided in a transparent audio cover C at the time of light emission according to Embodiment 1.  FIG. 2  is a sectional view taken along line A-A in  FIG. 1 . A design film  2  serving as a design construction layer is arranged opposite to a front surface  1   a  serving as an emission surface of a mirror type surface light-emission apparatus  1  composed of an organic electroluminescence apparatus (hereinafter, referred to as “organic EL apparatus”). Further, a flat-plate shaped transparent member  3  is arranged on a front surface  2   a  side of the design film  2 , while a half mirror layer  4  is formed on a front surface  3   a  of the transparent member  3 . 
     The surface light-emission apparatus  1  has an organic electroluminescence device  9  (hereinafter, referred to as “organic EL device  9 ”) formed by stacking a transparent electrode layer  6 , an organic layer  7  containing a light emitting layer, and a reflection electrode layer  8  on a surface of a transparent substrate  5 . Then, a protection layer  10  is formed so as to cover the entire organic EL device  9 . The rear surface of the transparent substrate  5  serves as the front surface  1   a  of the surface light-emission apparatus  1  and hence opposes the design film  2 . 
     Here, it is sufficient that the transparent substrate  5  is formed from a material having transmissivity to visible light. Thus, glass, resin, or the like may be employed. It is sufficient that the transparent electrode layer  6  has a function as an electrode and has transmissivity at least to visible light. Thus, for example, ITO is adopted as its material. 
     The organic layer  7  may be a single layer composed only of a light emitting layer, or alternatively may be a multilayer obtained when any one or more of a hole injection layer, a hole transporting layer, a hole injection transporting layer, a hole blocking layer, an electron injection layer, an electron transporting layer, and an electron blocking layer are stacked with a light emitting layer. Materials for the light emitting layer include publicly known organic light-emitting materials such as Alq 3  and DCM. Further, the hole injection layer, the hole transporting layer, the hole injection transporting layer, the hole blocking layer, the electron injection layer, the electron transporting layer, the electron blocking layer, and the like may appropriately be formed from publicly known materials. 
     It is sufficient that the reflection electrode layer  8  has a function as an electrode and has reflectivity at least to visible light. For example, Al, Cr, Mo, an Al alloy, an Al/Mo stack, and the like can be employed. 
     The protection layer  10  may be silicon nitride, silicon oxynitride, silicon oxide, or the like formed, for example, by plasma CVD. 
     In the design film  2 , a predetermined design  2   b  composed of a character, a graphic, or the like to be displayed on this display device is printed, for example, on a surface of a transparent resin film. Here, the design  2   b  has a light blocking property. 
     The transparent member  3  is composed, for example, of a transparent acrylics plate. On the front surface  3   a  of the transparent member  3 , Al, Cr, Mo, or the like is arranged by vapor deposition or sputtering so that a half mirror layer  4  is formed. The transparent member  3  may be composed of a glass plate. 
     Next, the operation of the display device according to Embodiment 1 of the present invention is described below. This display device displays through the half mirror layer  4  the design  2   b  drawn on the design film  2 , and is installed in the cabin of a vehicle such as an automobile, for example, in a state where the half mirror layer  4  is directed to the inner side of the cabin. 
     When a current is supplied between the transparent electrode layer  6  and the reflection electrode layer  8  of the surface light-emission apparatus  1  so that the organic EL device  9  is turned ON, light L 1  generated in the organic layer  7  enters directly the transparent electrode layer  6 , or alternatively, after being reflected in the reflection electrode layer  8 , enters the transparent electrode layer  6 , then is transmitted through the transparent substrate  5 , and then emitted from the front surface  1   a  of the surface light-emission apparatus  1 . After being transmitted through the design film  2 , the light L 1  enters the transparent member  3 , then is transmitted through the transparent member  3 , and then enters the half mirror layer  4  formed on the front surface  3   a  of the transparent member  3 . 
     Here, the light L 1  branches into: light L 2  that is transmitted through the half mirror layer  4  and then emitted; and light L 3  that is reflected in the half mirror layer  4  and then transmitted through the transparent member  3  again. The light L 2  having been transmitted through the half mirror layer  4  reaches, for example, the eyes of a passenger of the vehicle. As a result, an image of the design  2   b  drawn on the design film  2  is recognized by the passenger. On the other hand, the light L 3  reflected in the half mirror layer  4  is, after being transmitted through the transparent member  3  again, transmitted sequentially through the design film  2  and the transparent electrode layer  6  and the organic layer  7  of the surface light-emission apparatus  1 , and then reflected in the reflection electrode layer  8 . Light L 4  reflected as such in the reflection electrode layer  8  is transmitted sequentially through the organic layer  7 , the transparent electrode layer  6 , and the transparent substrate  5 , and then emitted from the front surface  1   a  of the surface light-emission apparatus  1 . The light L 4  is then transmitted through the design film  2  and the transparent member  3 , and then enters the half mirror layer  4  again. 
     A part of the light L 4  is reflected in the half mirror layer  4  so as to return to the transparent member  3 . The remaining part is transmitted through the half mirror layer  4  and then emitted as light L 5 . The light L 5  has a position shifted from that of the light L 2  described above, but reaches the eyes of the passenger of the vehicle similarly to the light L 2 . As a result, an image of the design  2   b  drawn on the design film  2  is recognized by the passenger. 
     At that time, the image formed by the light L 5  is shifted in a horizontal direction, i.e., in a plane direction of the half mirror layer  4 , relative to the image formed by the light L 2 . Thus, the passenger of the vehicle recognizes as if the design  2   b  drawn on the design film  2  comes up. In particular, when the angle at which the passenger of the vehicle sees the half mirror layer  4  is shallower, that is, inclined more from the normal direction to the surface of the half mirror layer  4 , the amount of shift between these two images becomes larger. Thus, the design  2   b  drawn on the design film  2  is seen in three dimensions. Further, even in a case where the angle at which the passenger of the vehicle sees the half mirror layer  4  is the same, when the transparent member  3  has a greater thickness, the amount of shift between the two images increases so that the design  2   b  is seen in a state of coming up further. 
     In this way, when the organic EL device  9  of the surface light-emission apparatus  1  is turned ON, the design  2   b  drawn on the design film  2  is displayed in three dimensions. In contrast, when the organic EL device  9  is turned OFF, the light emission from the surface light-emission apparatus  1  stops so that the light illuminating the design film  2  disappears. Thus, even when light L 6  on the side of the cabin of a vehicle enters the surface of the half mirror layer  4  so that a part of the light is transmitted through the half mirror layer  4 , the intensity of light reflected in the surface of the half mirror layer  4  is stronger. Accordingly, the passenger in the vehicle cannot see the design  2   b  drawn on the design film  2 . That is, when the organic EL device  9  is OFF, the display device serves as a simple mirror by virtue of the half mirror layer  4 . 
     As described above, the display device according to Embodiment 1 serves as a mirror and hence has satisfactory appearance at the time of non-emission of light of the surface light-emission apparatus  1 . Further, the design  2   b  drawn on the design film  2  comes up only at the time of light emission, thereby making it possible to surprise a person who sees the display. 
     Further, a simple configuration is employed such that the design film  2  is arranged between the surface light-emission apparatus  1  composed of an organic EL apparatus and the transparent member  3  in which the half mirror layer  4  is formed. This reduces the number of components, hence simplifies the manufacturing, and hence permits manufacturing at low cost. 
     Here, the configuration of the design construction layer is not limited to a configuration in which a design that is to be displayed on the display device and has a light blocking property is formed on a light transmitting substrate such as a transparent film. 
     For example, as shown in  FIG. 2   a , when a white light type EL apparatus is employed as the organic EL apparatus of the surface light-emission apparatus  1  while a design film  20  in which a design  20   b  is drawn in color ink having light transmissivity is employed, the design can directly be displayed in color. Here, an EL apparatus of monochrome type or the like which has a particular emission color may also be employed. 
     Embodiment 2 
       FIG. 3  shows a sectional view of a structure of a display device according to Embodiment 2. In this display device, in place of the design film  2  in the display device of Embodiment 1 shown in  FIG. 2 , a so-called punching metal  11  is employed as a design construction layer. In the punching metal  11 , a design is expressed by forming an opening  11   a  in a flat metal plate having a light blocking property. The reflection factor of the surface of the flat metal plate is assumed to be substantially lower than the reflection factor of the reflection electrode layer  8  of the organic EL device  9 . 
     Light L 1  generated in the organic layer  7  of the organic EL device  9  is transmitted through the transparent substrate  5 , then passed through the opening  11   a  of the punching metal  11 , then transmitted through the transparent member  3 , and then enters the half mirror layer  4 . A part of the light L 1  is transmitted through the half mirror layer  4  and then emitted as light L 2  to reach, for example, the eyes of a passenger of a vehicle. As a result, an image of the design drawn by the opening  11   a  of the punching metal  11  is recognized by the passenger. On the other hand, light L 3  reflected in the half mirror layer  4  is, after being transmitted through the transparent member  3  again, passed through the opening  11   a  of the punching metal  11 , then transmitted sequentially through the transparent substrate  5 , the transparent electrode layer  6 , and the organic layer  7 , and then reflected in the reflection electrode layer  8 . Light L 4  reflected as such in the reflection electrode layer  8  is transmitted sequentially through the organic layer  7 , the transparent electrode layer  6 , and the transparent substrate  5 , then passed through the opening  11   a  of the punching metal  11 , then transmitted through the transparent member  3 , and then enters the half mirror layer  4  again. 
     A part of the light L 4  is transmitted through the half mirror layer  4  and then emitted as light L 5  to reach the eyes of the passenger of the vehicle similarly to the light L 2 . As a result, an image of the design drawn by the opening  11   a  of the punching metal  11  is recognized by the passenger. On the other hand, light L 7  reflected in the half mirror layer  4  is transmitted through the transparent member  3  again. However, when the light enters the flat metal plate part which is not the opening  11   a  of the punching metal  11 , because the reflection factor of the surface of the flat metal plate is low, almost no light is reflected and emitted from the half mirror layer  4  to the passenger of the vehicle. 
     In this way, a shadow of the design formed by the opening  11   a  of the punching metal  11  is projected in a horizontally shifted manner within a range of the inside of the design where the opening  11   a  is formed. Thus, the design formed by the opening  11   a  of the punching metal  11  is seen by the passenger of the vehicle as if the design has a depth in three dimensions (in other words, a state where the shape of the design formed by the opening  11   a  of the punching metal  11  is depressed into an even depth is seen from obliquely above. 
     Embodiment 3 
       FIG. 4  shows a sectional view of a structure of a display device according to Embodiment 3. In this display device, in place of the design film  2  in the display device of Embodiment 1 shown in  FIG. 2 , a reflection film  12  which has a light blocking property and is patterned in correspondence with the shape of a design to be displayed is employed. The reflection film  12  can be formed by vapor deposition of a metallic material such as Al, Cr, and Mo on the front surface  1   a  of the surface light-emission apparatus  1 , that is, on the rear surface of the transparent substrate  5 . 
     Light La 1  generated in the organic layer  7  of the organic EL device  9  is transmitted through the transparent substrate  5 , then passed through an edge of a patterned opening  12   a  of a reflection film  12 , then transmitted through the transparent member  3 , and then enters the half mirror layer  4 . A part of the light La 1  is transmitted through the half mirror layer  4  and then emitted as light La 2 . Light La 3  reflected in the half mirror layer  4  is, after being transmitted through the transparent member  3  again, passed through the opening  12   a  of the reflection film  12 , then transmitted sequentially through the transparent substrate  5 , the transparent electrode layer  6 , and the organic layer  7 , and then reflected in the reflection electrode layer  8 . Light La 3  reflected as such in the reflection electrode layer  8  is transmitted sequentially through the organic layer  7 , the transparent electrode layer  6 , and the transparent substrate  5 , then passed through the opening  12   a  of the reflection film  12 , then transmitted through the transparent member  3 , and then enters the half mirror layer  4  again. A part of the light La 3  is transmitted through the half mirror layer  4  and then emitted as light La 4 . Light La 5  reflected in the half mirror layer  4  is transmitted through the transparent member  3  again. However, when the light enters the reflection film  12  of a portion where the opening  12   a  is not present, the light is reflected in the surface of the reflection film  12 , then transmitted through the transparent member  3 , and then enters the half mirror layer  4 . A part of the light La 5  is transmitted through the half mirror layer  4  and then emitted as light La 6 . The light reflected in the half mirror layer  4  is, after being transmitted through the transparent member  3  again, reflected in the surface of the reflection film  12 . 
     Similarly, among the light generated in the organic layer  7 , the light Lb 1  having entered the transparent member  3  through another edge of the opening  12   a  of the reflection film  12  enters the half mirror layer  4 . A part of the light Lb 1  is transmitted through the half mirror layer  4  and then emitted as light Lb 2 . Light Lb 3  reflected in the half mirror layer  4  is, after being transmitted through the transparent member  3 , reflected in the surface of the reflection film  12  and then enters the half mirror layer  4  again. A part of the light Lb 3  is transmitted through the half mirror layer  4  and then emitted as light Lb 4 . Further, light Lb 5  reflected in the half mirror layer  4  is reflected in the surface of the reflection film  12  and then enters the half mirror layer  4  again. A part of the light Lb 5  is transmitted through the half mirror layer  4  and then emitted as light Lb 6 . 
     In this way, the light emitted from the half mirror layer  4  reaches the eyes of a passenger of the vehicle. Thus, an image of the design patterned in the reflection film  12  is recognized by the passenger. At that time, the light La 1  having passed through an edge of the opening  12   a  of the reflection film  12  and the light Lb 1  having passed through another edge are both repeatedly reflected between the half mirror layer  4  and the surface of the reflection film  12  (or the reflection electrode layer  8 ). Then, at each time, a part of the light is transmitted through the half mirror layer  4  and emitted from a position shifted in a plane direction of the half mirror layer  4 . Thus, the design is seen by the passenger of the vehicle in a state of coming up in multiple in three dimensions without a loss of the design. Further, when the passenger of the vehicle moves to a position more distant from the front position with respect to the display surface of the surface light-emission apparatus (the vertical position relative to the opening  12   a  of the reflection film  12  in  FIG. 4 ), the design is seen in a state where the intervals of the designs to be displayed increase and that the design comes up in multiple without a loss. 
     Here, the reflection film  12  has a light blocking property. Thus, the light generated in the organic layer  7  is suppressed to be transmitted through the reflection film  12  of a portion other than the opening  12   a  and enter the transparent member  3 . Thus, the design can be seen clearly. 
     Further, when the reflection film  12  has a reflection factor equivalent to or greater than the reflection factor of the reflection electrode layer  8  of the organic EL device  9 , the design seen in multiple will becomes clearer. 
     In Embodiment 3 described above, the reflection film  12  was formed by vapor deposition of a metallic material on the front surface  1   a  of the surface light-emission apparatus  1 . However, the reflection film  12  may be formed by vapor deposition on the rear surface of the transparent member  3  opposing the surface light-emission apparatus  1 . 
     Further, in place of the vapor deposition film, a thin film made by at least one method selected from plating, plating-appearance hot stamping, and printing may be formed on the front surface  1   a  of the surface light-emission apparatus  1  or on the rear surface of the transparent member  3 , so this film may be employed as the reflection film  12 . 
     Further, as shown in  FIG. 4   a , a general-purpose masking sheet  22  of mirror type having a light blocking property and reflexibility may be patterned and then bonded to the front surface  1   a  of the surface light-emission apparatus  1  or to the rear surface of the transparent member  3 , so this film may be employed as the reflection film. 
     Embodiment 4 
       FIG. 5  shows a sectional view of a structure of a display device according to Embodiment 4. In this display device, in place of the surface light-emission apparatus  1  in the display device of Embodiment 1 shown in  FIG. 2 , a mirror type display  21  composed of an organic EL apparatus is employed. Further, the design film  2  is omitted while a transparent member  3  in which a half mirror layer  4  is formed is arranged on the front surface  21   a  side of the display  21 . 
     Almost similarly to the surface light-emission apparatus  1  according to Embodiment 1, the display  21  has an organic EL device  29  formed by stacking a transparent electrode layer  6 , an organic layer  7  containing a light emitting layer, and a reflection electrode layer  8  on the surface of a transparent substrate  5 . Then, a protection layer  10  is formed so as to cover the entire organic EL device  29 . However, the transparent electrode layer  6  is not formed over the entire organic EL device  29 . Instead, the transparent electrode layer  6  is patterned in correspondence with a design to be displayed on this display device. Here, the organic layer  7  and the reflection electrode layer  8  are formed over the entire surface of the organic EL device  29 . 
     Because the organic EL device  29  having this configuration is employed, when a current is supplied between the transparent electrode layer  6  and the reflection electrode layer  8  so that the organic EL device  29  is turned ON, only the region where the transparent electrode layer  6  is present causes light emission in the organic layer  7 . Thus, light emission of the pattern is performed in correspondence with the pattern shape of the transparent electrode layer  6 . 
     Also in Embodiment 4 of the present invention, similarly to Embodiment 1, the light L 1  generated in the organic layer  7  of the region where the transparent electrode layer  6  is present enters directly the transparent electrode layer  6 , or alternatively, after being reflected in the reflection electrode layer  8 , enters the transparent electrode layer  6 . Then, after being transmitted through the transparent substrate  5  and then emitted from the front surface  21   a  of the display  21 , the light enters the transparent member  3 , then is transmitted through the transparent member  3 , and then enters the half mirror layer  4 . 
     The light L 1  branches into: light L 2  that is transmitted through the half mirror layer  4  and then emitted; and light L 3  that is reflected in the half mirror layer  4  and then transmitted through the transparent member  3  again. The light L 2  having been transmitted through the half mirror layer  4  reaches, for example, the eyes of a passenger of the vehicle. As a result, an image of the design drawn as a pattern shape of the transparent electrode layer  6  is recognized by the passenger. On the other hand, the light L 3  reflected in the half mirror layer  4  is, after being transmitted through the transparent member  3  again, transmitted sequentially through the transparent electrode layer  6  and the organic layer  7  of the display  21 , and then reflected in the reflection electrode layer  8 . Light L 4  thus reflected in the reflection electrode layer  8  is transmitted sequentially through the organic layer  7 , the transparent electrode layer  6 , and the transparent substrate  5 , and then emitted from the front surface  21   a  of the display  21 . The light L 4  is then transmitted through the transparent member  3 , and then enters the half mirror layer  4  again. 
     A part of the light L 4  is transmitted through the half mirror layer  4  and then emitted as light L 5  to reach the eyes of the passenger of the vehicle similarly to the light L 2 . As a result, an image of the design drawn as a pattern shape of the transparent electrode layer  6  is recognized by the passenger. 
     At that time, the image formed by the light L 5  is shifted in a horizontal direction, i.e., in a plane direction of the half mirror layer  4 , relative to the image formed by the light L 2 . Thus, the design comes up and is seen in three dimensions. 
     Here, when the transparent member  3  has a greater thickness, the amount of shift between the two images increases so that the design is seen in a state of coming up further. 
     Further, when the organic EL device  29  is turned OFF, the light emission from the display  21  stops, so the display device serves as a simple mirror by virtue of the half mirror layer  4 . Thus, the design drawn as a pattern shape of the transparent electrode layer  6  becomes invisible. 
     As described above, also in Embodiment 4 of the present invention, similarly to Embodiments 1 to 3, the display  11  serves as a mirror and hence has satisfactory appearance at the time of non-emission of light. Further, the design drawn as a pattern shape of the transparent electrode layer  6  comes up and is seen in three dimensions only at the time of light emission. 
     Further, the design film  2  employed in the display device of Embodiment 1 is omitted. This reduces the number of components, hence simplifies the manufacturing, thereby enabling manufacturing of the display device at low cost. 
     Embodiment 5 
       FIG. 6  shows a sectional view of a structure of a display device according to Embodiment 5. Unlike the display device of Embodiment 4 shown in  FIG. 5  that employs the display  21  having the organic EL device  29  in which the transparent electrode layer  6  is patterned, the display device of this embodiment employs a mirror type display  31  having an organic EL device  39  in which organic layers  7 ,  71 , and  72  having the same emission color are patterned. A transparent member  3  in which a half mirror layer  4  is formed is arranged on the front surface  31   a  side of the display  31 . 
     The organic EL device  39  is formed by stacking a transparent electrode layer  6 , organic layers  7 ,  71 , and  72  containing light emitting layers, and a reflection electrode layer  8  on the surface of a transparent substrate  5 . The organic layers  7 ,  71 , and  72 , at least the light emitting layers when these organic layers have a multilayer structure containing a light emitting layer, are patterned in correspondence with a design to be displayed on this display device. Here, when the organic layers  7 ,  71 , and  72  of single layer structure having only a light emitting layer are to be patterned, or alternatively when entirety of the thickness direction of the organic layers  7 ,  71 , and  72  of multilayer structure containing a light emitting layer are to be patterned, in order to prevent a short circuit between the transparent electrode layer  6  and the reflection electrode layer  8 , a transparent insulating layer  32  need to be formed in a part where the organic layers  7 ,  71 , and  72  are removed. Here, the transparent electrode layer  6  and the reflection electrode layer  8  are formed over the entire surface of the organic EL device  39 . 
     Because the organic EL device  39  having this configuration is employed, when a current is supplied between the transparent electrode layer  6  and the reflection electrode layer  8  so that the organic EL device  39  is turned ON, only the region where the light emitting layer is present emits light. Thus, also in Embodiment 5 of the present invention, similarly to Embodiment 4, when the organic EL device  39  is turned ON, the design drawn as a pattern shape of the light emitting layers comes up and is seen in three dimensions. When the organic EL device  39  is turned OFF, the display device serves as a simple mirror by virtue of the half mirror layer  4 . 
     Here, the emission colors of the organic layers  7 ,  71 , and  72  in Embodiment 5 are the same. However, the present invention is not limited thereto. For example, the organic layers  7 ,  71 , and  72  individually may emit light in any one of two colors. Alternatively, the emission color of the organic layer  7  may be red, the emission color of the organic layer  71  may be green, and the emission color of the organic layer  72  may be blue. 
     Embodiment 6 
       FIG. 7  shows a sectional view of a structure of a display device according to Embodiment 6. Unlike the display device of Embodiment 4 shown in  FIG. 5  that employs the display  21  having the organic EL device  29  in which the transparent electrode layer  6  is patterned, the display device of this embodiment employs a mirror type display  41  having an organic EL device  49  provided with a patterned insulating layer  42 . A transparent member  3  in which a half mirror layer  4  is formed is arranged on the front surface  41   a  side of the display  41 . 
     The organic EL device  49  is formed by stacking a transparent electrode layer  6 , an insulating layer  42 , an organic layer  7  containing a light emitting layer, and a reflection electrode layer  8  on the surface of a transparent substrate  5 . The insulating layer  42  is patterned in correspondence with a design to be displayed on this display device. The insulating layer  42  has transmissivity to visible light. Here, the transparent electrode layer  6 , the organic layer  7 , and the reflection electrode layer  8  are formed over the entire surface of the organic EL device  49 . 
     Because the organic EL device  49  having this configuration is employed, when a current is supplied between the transparent electrode layer  6  and the reflection electrode layer  8  so that the organic EL device  49  is turned ON, the region where the insulating layer  42  is present does not emit light, and only the region where the insulating layer  42  is not present emits light. Thus, also in Embodiment 6 the present invention, similarly to Embodiments 4 and 5, when the organic EL device  49  is turned ON, a design drawn by reversing the pattern shape of the insulating layer  42  comes up and is seen in three dimensions. When the organic EL device  49  is turned OFF, the display device serves as a simple mirror by virtue of the half mirror layer  4 . 
     Here, the insulating layer  42  has been formed between the transparent electrode layer  6  and the organic layer  7 . However, it is sufficient that the insulating layer  42  is interposed between the transparent electrode layer  6  and the reflection electrode layer  8 . Thus, the insulating layer  42  may be formed, for example, between the organic layer  7  and the reflection electrode layer  8 . 
     Embodiment 7 
       FIG. 8  shows a sectional view of a structure of a display device according to Embodiment 7. Unlike the display device of Embodiment 4 shown in  FIG. 5  that employs the display  21  having the organic EL device  29  in which the transparent electrode layer  6  is patterned, the display device of this embodiment employs a mirror type display  51  having an organic EL device  59  in which a large number of pixels are formed in the shape of a matrix. A transparent member  3  in which a half mirror layer  4  is formed is arranged on the front surface  51   a  side of the display  51 . 
     The organic EL device  59  has a large number of pixels each formed by stacking a transparent electrode layer  6 , an organic layer  7  containing a light emitting layer, and a reflection electrode layer  8  on the surface of a transparent substrate  5 . When these pixels are selected and caused to emit light, a desired pattern emits light so that dot matrix display can be performed. 
     Thus, similarly to Embodiments 4 to 6, when the organic EL device  59  is turned ON, the design drawn as a pattern of light emission comes up and is seen in three dimensions. When the organic EL device  59  is turned OFF, the display device serves as a simple mirror by virtue of the half mirror layer  4 . 
     In particular, in Embodiment 7 of the present invention, the pattern of light emission of the organic EL device  59  can be changed arbitrarily by selection of the pixels. Thus, a plurality of designs can be displayed in turn in a time-series manner. 
     Here, the display  51  may be driven by a passive matrix method or an active matrix method. 
     Further, the display  51  may be a color display capable of displaying in plural colors or alternatively a monochrome display that displays in a particular color. 
     In Embodiment 7 of the present invention, a design to be displayed was displayed by dot matrix display. However, in place of the display  51 , as shown in  FIG. 8   a , the design may also be displayed by segment display by employing a mirror type display  61  having an organic EL device  69  manufactured by a method, for example, in which the transparent electrode layer is formed in the form of a plurality of segments by division patterning and in which the organic layer containing a light emitting layer and the reflection electrode layer are formed over the entire surface. 
     In all the display devices of Embodiments 1 to 7 described above, when the organic EL device is turned ON, a design to be displayed comes up and is seen in three dimensions, while the display device serves as a simple mirror when the organic EL device is turned OFF. Thus, an effect is obtained that the depth is seen greater than the actual thickness of the display device and that the space where the display device is installed is seen larger. Thus, these display devices are more effective when the display device shown as an example of the audio cover C in Embodiment 1 is employed in a limited small space like in the cabin of a vehicle such as an automobile. 
     In addition to the use in the audio cover C shown as an example in Embodiment 1, a display device  15  of the present invention may be installed in a scuff plate  13 , an inside door handle  14 , and the like in the cabin of a vehicle as shown in  FIG. 9 . 
     When a display device  15  constructed according to any one of Embodiments 1 to 7 is employed in the scuff plate  13  such that characters indicating the car type or the company name is displayed, the characters come up and are seen in three dimensions. In particular, the scuff plate  13  is installed at a position seen obliquely downward from a passenger of the vehicle when the door is opened at the time of getting off the car. Thus, the characters are seen in three dimensions to a greater extent. Further, when the characters are displayed in multiple by using the display device of Embodiment 3, aesthetic appearance is improved so that the effect of the design improves. 
     Further, the emission color may be monochrome such as white, blue, and yellow. However, when a plurality of organic EL devices having mutually different emission colors are arranged and used, display can be performed in a state where the emission color is changed for every character. Further, when the voltage applied between the electrodes of the organic EL device is changed part by part, gradation also can be formed. 
     In addition to characters, a geometrical pattern or the like may be displayed on the display device  15 . For example, when the display device of Embodiment 3 is used, a repeated pattern of a geometrical pattern is displayed. 
     Both of the display of characters and the display of a geometrical pattern may be used as lighting in a vehicle. 
     When the display device  15  of the present invention is to be installed into the scuff plate  13 , it is preferable that the display device  15  be driven in synchronization with the opening and closing of the door such that the display device  15  lights up when the door is opened. 
     When the display device  15  of the present invention is installed in the inside door handle  14 , a geometrical pattern or the like can be displayed in three dimensions when the display device  15  is turned ON. Because the inside door handle  14  is installed in general at a position seen obliquely downward from a passenger of a vehicle, the geometrical pattern or the like is seen in three dimensions to a greater extent. Further, when the display device of Embodiment 3 is employed, a geometrical pattern is displayed in multiple so that a repeated pattern can be obtained. 
     In addition to the display of a geometrical pattern, characters or the like may be displayed. In this case, a plurality of organic EL devices having mutually different emission colors may be used so that display may be performed in a state where the emission color is changed for every character. Further, when the voltage applied between the electrodes of the organic EL device is changed part by part, gradation also can be formed. 
     The inside door handle  14  is in general formed in the shape of a curved surface having a smooth surface. Then, the organic EL device can be formed in a remarkably reduced thickness. Thus, when the organic EL device is employed, the display device  15  of the present invention can easily be installed in accordance with the curved surface of the inside door handle  14 . 
     The display device  15  serves as a mirror at the time of non-emission of light. Thus, the inside door handle  14  is not seen as a handle provided with a light source, and hence has satisfactory appearance. 
     Further, because the inside door handle  14  is operated during the stop of the vehicle, the display device  15  may be driven in synchronization with the operation of the shift lever so that the brightness of light emission is increased for the purpose of improving the visibility for a passenger during the stop of the vehicle. Further, during the driving of the vehicle, the brightness of light emission may be reduced, or alternatively the display device  15  may go into a non light-emitting state. 
     In addition to the use in the inside door handle  14  and the scuff plates  13 , the display device according to the present invention may be installed in the following parts in the cabin of a vehicle. 
     (1) Periphery of Instrument Panel 
     Combination meter, grab door, console lid, ashtray, steering wheel, rear view mirror, cup holder, and small item holder for driver&#39;s seat 
     (2) Periphery of Door 
     Door trim, pillar garnish, armrest, door armrest, and door trim pocket 
     (3) Periphery of Seat 
     Seat track cover, seat back pocket, seat belt buckle, headrest, and seat under-tray 
     (4) Periphery of Deck 
     Deck side trim, back door trim, deck under-tray, tonneau cover, rear deck floor trim, and deck side box for wagon-type car 
     Luggage mat and package tray trim for sedan-type car 
     (5) Others 
     Roof head lining, carpet, assist grip, overhead console, air purifier, air conditioner switch, and parking brake lever. 
     Further, in the display device of Embodiment 7, a plurality of designs can be displayed in turn in a time-series manner. Thus, as shown in  FIG. 10 , a clock  60  may be constructed and installed in the cabin of a vehicle. 
     Here, in each of the above-mentioned embodiments, the surface light-emission apparatus  1 , or the displays  21 ,  31 ,  41 , or  51 , which includes a bottom emission type organic EL apparatus, has been employed. However, the present invention is not limited thereto. That is, a mirror type surface light-emission apparatus or a display, which includes, a top emission type organic EL apparatus, may also be employed. Further, the present invention is not limited to an organic EL apparatus. That is, a mirror type surface light-emission apparatus or a display, which includes an inorganic EL apparatus, may be employed. 
     Further, in each of the above-mentioned embodiments, the transparent member  3  may be an air layer. Alternatively, the transparent member  3  and the transparent substrate  5  may be integrated.