Abstract:
Provided is a linear light source capable of alleviating increases in display apparatus sizes. The linear light source ( 30 ) comprises white LEDs ( 31 ), infrared LEDs ( 32 ), and a substrate ( 33 ) whereupon the white LEDs and the infrared LEDs are arranged linearly. An anode terminal ( 33   c ) and a cathode terminal ( 33   e ) for the white LEDs are provided on an end section on one side of the substrate, and an anode terminal ( 33   d ) and a cathode terminal ( 33   f ) for the infrared LEDs are provided on an end section on the other side of the substrate.

Description:
TECHNICAL FIELD 
       [0001]    This invention relates to a linear light source, a backlight device, and a display apparatus, and more specifically to a linear light source including visible light emitting elements and invisible light emitting elements, and a backlight device and a display apparatus that include the linear light source. 
       BACKGROUND ART 
       [0002]    Conventionally, a display apparatus that includes a linear light source including visible light emitting elements and invisible light emitting elements is known. 
         [0003]      FIG. 12  is a plan view illustrating the structure of a display apparatus including a linear light source according to a conventional example.  FIGS. 13 to 15  are diagrams for explaining the structure of the linear light source in the display apparatus according to the conventional example illustrated in  FIG. 12 . 
         [0004]    As illustrated in  FIG. 12 , a display apparatus  501  according to a conventional example includes a display panel  502 , a drive IC (Integrated Circuit)  503  for driving the display panel  502 , a frame  504  disposed on the rear surface side of the display panel  502 , a light guide plate  505  (see  FIG. 13 ) disposed on the rear surface side of the display panel  502 , two linear light sources  510  (see  FIG. 13 ) disposed on both sides in the longitudinal direction of the light guide plate  505  (direction A), and FPCs (Flexible Printed Circuits)  506  and  507  that are electrically connected to the linear light sources  510 . 
         [0005]    The display panel  502  is composed of a pair of transparent substrates having a liquid crystal layer (not illustrated) interposed therebetween, and is formed in a rectangular shape. Further, the display panel  502  functions as a touch panel. The drive IC  503  is mounted on one of the transparent substrates of the display panel  502 . The frame  504  is formed in a frame shape so as to have an opening in a region thereof corresponding to a display region of the display panel  502 . 
         [0006]    As illustrated in  FIG. 13 , the two linear light sources  510  are disposed so as to extend in the short-side direction of the light guide plate  505  (direction B (direction perpendicular to the direction A)). As illustrated in FIGS.  14  and  15 , each of the linear light sources  510  includes a plurality of white LEDs (visible light emitting elements)  511  that emit white light, a plurality of infrared LEDs (invisible light emitting elements)  512  that emit infrared light, and a substrate  513  having a main surface  513   a  on which the plurality of white LEDs  511  and the plurality of infrared LEDs  512  are mounted. 
         [0007]    The white LEDs  511  are provided to display an image, and the infrared LEDs  512  are provided to detect a touch of a user&#39;s finger, a stylus, or the like on a surface of the display panel  502  (touch panel). 
         [0008]    Four terminals  513   c ,  513   d ,  513   e , and  513   f  are formed in one end portion on the main surface  513   a  of the substrate  513  in the direction B. The four terminals  513   c  to  513   f  are provided to supply electric power to the white LEDs  511  and the infrared LEDs  512 . 
         [0009]    As illustrated in  FIG. 13 , furthermore, the terminals  513   c  to  513   f  (see  FIGS. 14 and 15 ) of one of the two linear light sources  510  are electrically connected to the FPC  506 . The terminals  513   c  to  513   f  (see  FIGS. 14 and 15 ) of the other linear light source  510  of the two linear light sources  510  are electrically connected to the FPC  507 . 
         [0010]    In addition, the four terminals  513   c  to  513   f  (see  FIGS. 14 and 15 ) are disposed outward from end surfaces of the light guide plate  505  and the display panel  502  (see  FIG. 12 ) on one side in the direction B. Therefore, as illustrated in  FIG. 12 , the frame  504  has projecting portions  504   b  and  504   c  that extend outward in the direction B so as to cover the terminals  513   c  to  513   f.    
         [0011]    In the display apparatus  501  according to the conventional example illustrated in  FIG. 12 , the four terminals  513   c  to  513   f  are provided on one side of each of the substrates  513  in the direction B. Thus, unlike a case where terminals  513   c  to  513   f  are provided separately on one side and the other side of each of the substrates  513  in the direction B, it is sufficient to connect one FPC  506  or  507  to only one side of each of the linear light sources  510  in the direction B. Therefore, an increase in the number of FPCs to be connected to the linear light sources  510  can be prevented. 
         [0012]    A display apparatus in which visible light emitting elements and invisible light emitting elements are arranged linearly is disclosed in, for example, Patent Document 1. 
       CITATION LIST 
     Patent Literature 
       [0000]    
       
         Patent Document 1: Japanese Unexamined Patent Application Publication No. 2009-229502 (pages 12 to 13, FIG. 5) 
       
     
       SUMMARY OF INVENTION 
     Technical Problem 
       [0014]    In the display apparatus  501  according to the conventional example illustrated in  FIG. 12 , however, since the terminals  513   c  to  513   f  of the linear light sources  510  are disposed outward from end surfaces of the light guide plate  505  and the display panel  502  on one side in the direction B, the frame  504  needs to be provided with the projecting portions  504   b  and  504   c  that project outward in the direction B. Thus, there is a problem in that the overall size of the display apparatus  501  is increased. 
         [0015]    This invention has been made in order to solve problems such as those described above, and it is an object of this invention to provide a linear light source, a backlight device, and a display apparatus that are capable of preventing an increase in the size of the display apparatus. 
       Solution to Problem 
       [0016]    In order to achieve the above object, a linear light source according to a first aspect of this invention includes visible light emitting elements, invisible light emitting elements, and a substrate including a main surface on which the visible light emitting elements and the invisible light emitting elements are arranged linearly. The substrate has thereon an anode terminal for the visible light emitting elements, a cathode terminal for the visible light emitting elements, an anode terminal for the invisible light emitting elements, and a cathode terminal for the invisible light emitting elements. The anode terminal for the visible light emitting elements, the cathode terminal for the visible light emitting elements, the anode terminal for the invisible light emitting elements, and the cathode terminal for the invisible light emitting elements are disposed separately in one end portion of the substrate and in another end portion of the substrate. 
         [0017]    In the linear light source according to the first aspect, as described above, the anode terminal for the visible light emitting elements, the cathode terminal for the visible light emitting elements, the anode terminal for the invisible light emitting elements, and the cathode terminal for the invisible light emitting elements are disposed separately in one end portion of the substrate and in the other end portion of the substrate. Thus, compared to a case where, for example, terminals are disposed only in one end portion of the substrate, a projection amount by which the terminals on the substrate project outward from an end surface of a light guide plate or a display panel can be reduced. Since a display apparatus generally has a frame larger than a light guide plate or a display panel, the reduction in the projection amount of the terminals on the substrate in the manner described above allows the terminals on the substrate to be disposed within the frame. Thus, there is no need to provide a projecting portion for the frame or to increase the size of the frame, and therefore an increase in the overall size of the display apparatus can be prevented. 
         [0018]    In addition, the anode terminal for the visible light emitting elements, the cathode terminal for the visible light emitting elements, the anode terminal for the invisible light emitting elements, and the cathode terminal for the invisible light emitting elements are disposed separately in the one end portion of the substrate and in the other end portion of the substrate, thus making it possible to make the projection amount of terminals disposed in the one end portion of the substrate equal to the projection amount of terminals disposed in the other end portion of the substrate. Thus, the contours on one side and the other side of the frame can be made symmetrical with respect to, for example, a display panel. 
         [0019]    In the linear light source according to the first aspect, preferably, two of the anode terminal for the visible light emitting elements, the cathode terminal for the visible light emitting elements, the anode terminal for the invisible light emitting elements, and the cathode terminal for the invisible light emitting elements are disposed in the one end portion separately on the main surface and a back surface of the substrate, and the other two of the anode terminal for the visible light emitting elements, the cathode terminal for the visible light emitting elements, the anode terminal for the invisible light emitting elements, and the cathode terminal for the invisible light emitting elements are disposed in the other end portion separately on the main surface and the back surface of the substrate. With this configuration, compared to a case where, for example, a plurality of terminals are formed only on a main surface of a substrate, the projection amount of the terminals on the substrate can be reduced. 
         [0020]    In the linear light source according to the first aspect, preferably, the anode terminal for the visible light emitting elements and the cathode terminal for the visible light emitting elements are disposed in the one end portion of the substrate, and the anode terminal for the invisible light emitting elements and the cathode terminal for the invisible light emitting elements are disposed in the other end portion of the substrate. With this configuration, it is sufficient to connect a wiring member for the visible light emitting elements to the one end portion of the substrate and to connect a wiring member for the invisible light emitting elements to the other end portion of the substrate. 
         [0021]    In the linear light source according to the first aspect, preferably, the cathode terminal for the visible light emitting elements and the cathode terminal for the invisible light emitting elements are disposed in the one end portion of the substrate, and the anode terminal for the visible light emitting elements and the anode terminal for the invisible light emitting elements are disposed in the other end portion of the substrate. With this configuration, it is sufficient to connect a wiring member for the cathode terminals to the one end portion of the substrate and to connect a wiring member for the anode terminals to the other end portion of the substrate. 
         [0022]    In the linear light source according to the first aspect, preferably, a terminal disposed in the one end portion of the substrate and a terminal disposed in the other end portion of the substrate among the anode terminal for the visible light emitting elements, the cathode terminal for the visible light emitting elements, the anode terminal for the invisible light emitting elements, and the cathode terminal for the invisible light emitting elements have different lengths in a direction in which the visible light emitting elements and the invisible light emitting elements are arranged. With this configuration, one side and the other side of the linear light source can be easily identified, and the efficiency with which work of assembling a backlight device is performed can therefore be improved. 
         [0023]    In the linear light source according to the first aspect, preferably, the visible light emitting elements and the invisible light emitting elements are alternately arranged. With this configuration, uniform brightness can be achieved across the display panel. 
         [0024]    In the linear light source according to the first aspect, the visible light emitting elements may include white light emitting elements. 
         [0025]    In the linear light source according to the first aspect, the invisible light emitting elements may include infrared light emitting elements or ultraviolet light emitting elements. 
         [0026]    A backlight device according to a second aspect of this invention includes the linear light source having the above configuration. With this configuration, a backlight device capable of preventing an increase in the size of a display apparatus can be obtained. 
         [0027]    Preferably, the backlight device according to the second aspect further includes a light guide plate including a first side surface and a second side surface disposed opposite the first side surface, and the linear light source includes two linear light sources that irradiate the first side surface and the second side surface, respectively, of the light guide plate with light. With this configuration, light can be caused to enter the light guide plate through the first side surface and the second side surface thereof using two linear light sources, and brightness can therefore be easily improved. 
         [0028]    Preferably, the backlight device that includes the two linear light sources described above further includes a wiring member that is electrically connected to the linear light sources. End portions of the two linear light sources on one side are connected to each other by the wiring member, and end portions of the two linear light sources on another side are also connected to each other by the wiring member. With this configuration, a wiring member can be shared between two linear light sources, and the wiring member can be easily led out in one side direction of the two linear light sources. 
         [0029]    A display apparatus according to a third aspect of this invention includes the backlight device having the above configuration, and a touch panel that is irradiated with light from the backlight device. With this configuration, a display apparatus capable of preventing an increase in the size thereof can be obtained. 
       Advantageous Effects of Invention 
       [0030]    According to the present invention, therefore, a linear light source, a backlight device, and a display apparatus that are capable of preventing an increase in the size of the display apparatus can be easily obtained. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0031]      FIG. 1  is a perspective view illustrating the structure of a liquid crystal display apparatus including a linear light source according to a first embodiment of the present invention. 
           [0032]      FIG. 2  is an exploded perspective view illustrating the structure of the liquid crystal display apparatus including the linear light source according to the first embodiment of the present invention. 
           [0033]      FIG. 3  is a perspective view illustrating the structure of the linear light source according to the first embodiment of the present invention illustrated in  FIG. 2 . 
           [0034]      FIG. 4  is a perspective view illustrating the structure of the linear light source according to the first embodiment of the present invention illustrated in  FIG. 2 , as viewed from the back surface side. 
           [0035]      FIG. 5  is a plan view illustrating the structure of the linear light source according to the first embodiment of the present invention illustrated in  FIG. 2 . 
           [0036]      FIG. 6  is a side view illustrating the structure of the linear light source according to the first embodiment of the present invention illustrated in  FIG. 2 . 
           [0037]      FIG. 7  is a bottom view illustrating the structure of the linear light source according to the first embodiment of the present invention illustrated in  FIG. 2 . 
           [0038]      FIG. 8  is a perspective view illustrating the structure of the linear light source and FPCs according to the first embodiment of the present invention illustrated in  FIG. 2 . 
           [0039]      FIG. 9  is an exploded perspective view illustrating the structure of the linear light source and the FPCs according to the first embodiment of the present invention illustrated in  FIG. 8 . 
           [0040]      FIG. 10  is a perspective view illustrating the structure of a linear light source according to a second embodiment of the present invention. 
           [0041]      FIG. 11  is a perspective view illustrating the structure of the linear light source according to the second embodiment of the present invention illustrated in  FIG. 10 , as viewed from the back surface side. 
           [0042]      FIG. 12  is a plan view illustrating the structure of a display apparatus including a linear light source according to a conventional example. 
           [0043]      FIG. 13  is a plan view for explaining the structure of the linear light source in the display apparatus according to the conventional example illustrated in  FIG. 12 . 
           [0044]      FIG. 14  is a plan view illustrating the structure of the linear light source in the display apparatus according to the conventional example illustrated in  FIG. 12 . 
           [0045]      FIG. 15  is a side view illustrating the structure of the linear light source in the display apparatus according to the conventional example illustrated in  FIG. 12 . 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0046]    Embodiments of the present invention will be described hereinafter with reference to the drawings. 
       First Embodiment 
       [0047]    A liquid crystal display apparatus  1  including a linear light source  30  according to a first embodiment of the present invention will be described with reference to  FIGS. 1 to 9 . For ease of understanding, hatching may be used in plan views, side views, and bottom views. 
         [0048]    The liquid crystal display apparatus  1  may be used in, for example, a mobile device such as a mobile telephone. As illustrated in  FIG. 1 , the liquid crystal display apparatus  1  is composed of a liquid crystal display panel  10 , and a backlight device  20  disposed on the rear surface side of the liquid crystal display panel  10 . The liquid crystal display apparatus  1  is an example of a “display apparatus” according to the present invention, and the liquid crystal display panel  10  is an example of a “touch panel” according to the present invention. 
         [0049]    As illustrated in  FIG. 2 , the liquid crystal display panel  10  is formed in a rectangular shape, and includes an AM substrate (active matrix substrate)  11   a  and a counter substrate  11   b  disposed so as to face the AM substrate  11   a . A liquid crystal (not illustrated) is sealed between the AM substrate  11   a  and the counter substrate  11   b . The liquid crystal display panel  10  functions as a display panel as a result of being illuminated by the backlight device  20 . 
         [0050]    The AM substrate  11   a  has a larger area than the counter substrate  11   b . To a predetermined region of the AM substrate  11   a , a drive IC  12  for driving the liquid crystal display panel  10  and an FPC  13  for inputting a control signal to the drive IC  12  are electrically connected. 
         [0051]    The liquid crystal display panel  10  further has light receiving elements, which are photodiodes or the like (not illustrated) arranged in a matrix for detecting a touch of a user&#39;s finger, a stylus, or the like, and the liquid crystal display panel  10  also functions as a touch panel. A touch panel having light receiving elements (not illustrated) arranged in a matrix for detecting a touch of a user&#39;s finger, a stylus, or the like may be bonded to the liquid crystal display panel  10 . 
         [0052]    The backlight device  20  is formed in a rectangular shape. Further, the backlight device  20  is an edge-light backlight device, and includes a plurality of optical sheets  21  disposed on the rear surface side of the liquid crystal display panel  10 , a resin frame  22  that surrounds the optical sheets  21 , a light guide plate  23  disposed inside the frame  22 , two linear light sources  30  that irradiate the light guide plate  23  with light, two FPCs  24  and  25  that connect the two linear light sources  30  to each other, a reflection sheet  26  disposed on the rear surface side of the light guide plate  23 , and a back chassis  27  that houses the above components. The peripheral portion of the liquid crystal display panel  10  is fixed to the frame  22  (backlight device  20 ) using an adhesive sheet  40 . The FPCs  24  and  25  are examples of a “wiring member” according to the present invention. 
         [0053]    The plurality of optical sheets  21  include a prism sheet, a lens sheet, and/or the like, and have a function of condensing light from the light guide plate  23  within a predetermined viewing angle. 
         [0054]    The frame  22  has an opening  22   a  formed in a region thereof corresponding to a display region of the liquid crystal display panel  10 . 
         [0055]    The light guide plate  23  is formed of resin or the like having light transmission properties. The light guide plate  23  includes side surfaces  23   a  and  23   b  formed on both sides in the longitudinal direction thereof (direction A), and side surfaces  23   c  and  23   d  formed on both sides in the short-side direction thereof (direction B (direction perpendicular to the direction A)). Furthermore, the light guide plate  23  is formed so that light coming from the linear light sources  30  is emitted toward the liquid crystal display panel  10  side through the light guide plate  23 . The side surface  23   a  is an example of a “first side surface” according to the present invention, and the side surface  23   b  is an example of a “second side surface” according to the present invention. 
         [0056]    The two linear light sources  30  are disposed so as to extend in the direction B. The two linear light sources  30  are also disposed so as to face the side surfaces  23   a  and  23   b  of the light guide plate  23 . The light emitted from the linear light source  30  enters the light guide plate  23 , and is emitted toward the liquid crystal display panel  10 . 
         [0057]    Here, in the first embodiment, as illustrated in  FIGS. 3 to 7 , each of the linear light sources  30  is composed of a plurality of white LEDs  31  that emit white light, a plurality of infrared LEDs  32  that emit infrared light, and an elongated substrate  33  having a main surface  33   a  (see  FIG. 3 ) on which the plurality of white LEDs  31  and the plurality of infrared LEDs  32  are mounted. The white LEDs  31  are examples of “visible light emitting elements” and “white light emitting elements” according to the present invention. The infrared LEDs  32  are examples of “invisible light emitting elements” and “infrared light emitting elements” according to the present invention. 
         [0058]    In the first embodiment, furthermore, the white LEDs  31  and the infrared LEDs  32  are alternately arranged on the main surface  33   a  of the substrate  33 . In addition, the white LEDs  31  and the infrared LEDs  32  are arranged at constant pitches in the direction B. Additionally, the white LEDs  31  and the infrared LEDs  32  are arranged symmetrically with respect to the center of the substrate  33  in the direction B. 
         [0059]    The white LEDs  31  are provided to display an image on the liquid crystal display panel  10  (see  FIG. 2 ). The white LEDs  31  are composed of, for example, blue LEDs and fluorescent materials that convert part of blue light emitted from the blue LEDs into yellow light. The white LEDs  31  may be composed of red LEDs, green LEDs, and blue LEDs, or may have any other configuration. 
         [0060]    The infrared LEDs  32  are provided to detect a touch of a user&#39;s finger, a stylus, or the like on the liquid crystal display panel  10  (see  FIG. 2 ). Specifically, when infrared light is emitted from the infrared LEDs  32 , the infrared light is emitted toward the liquid crystal display panel  10  (touch panel) through the light guide plate  23  (see  FIG. 2 ). Then, the infrared light is emitted in front of the liquid crystal display panel  10  (touch panel). At this time, if a user&#39;s finger, a stylus, or the like touches (or approaches) the liquid crystal display panel  10  (touch panel), the infrared light is reflected toward the liquid crystal display panel  10  (touch panel) side, and the reflected infrared light is detected by using the light receiving elements described above (not illustrated). It is therefore possible to detect a touch (or approach) of the user&#39;s finger, the stylus, or the like on the liquid crystal display panel  10  (touch panel). 
         [0061]    The use of light emitting elements that emit invisible light (the infrared LEDs  32 ) to detect a touch of a user&#39;s finger, a stylus, or the like on the liquid crystal display panel  10  (touch panel) helps avoid a situation where the image displayed on the liquid crystal display panel  10  does not have a desired hue. 
         [0062]    In the first embodiment, a white LED anode terminal  33   c  that functions as an anode terminal of the white LEDs  31  is formed in one end portion on the main surface  33   a  of the substrate  33  in the direction B, and an infrared LED anode terminal  33   d  that functions as an anode terminal of the infrared LEDs  32  is formed in the other end portion on the main surface  33   a  of the substrate  33  in the direction B. Further, a white LED cathode terminal  33   e  that functions as a cathode terminal of the white LEDs  31  is formed in the one end portion on the back surface  33   b  of the substrate  33  in the direction B, and an infrared LED cathode terminal  33   f  that functions as a cathode terminal of the infrared LEDs  32  is formed in the other end portion on the back surface  33   b  of the substrate  33  in the direction B. 
         [0063]    The white LED anode terminal  33   c  is an example of an “anode terminal” according to the present invention, and the infrared LED anode terminal  33   d  is an example of an “anode terminal” according to the present invention. The white LED cathode terminal  33   e  is an example of a “cathode terminal” according to the present invention, and the infrared LED cathode terminal  33   f  is an example of a “cathode terminal” according to the present invention. 
         [0064]    The white LED anode terminal  33   c  and the white LED cathode terminal  33   e  are provided to supply electric power to the white LEDs  31 . The infrared LED anode terminal  33   d  and the infrared LED cathode terminal  33   f  are provided to supply electric power to the infrared LEDs  32 . 
         [0065]    In the first embodiment, furthermore, the white LED anode terminal  33   c  is formed so as to be longer in the direction B (direction in which the white LEDs  31  and the infrared LEDs  32  are arranged) than the infrared LED anode terminal  33   d . That is, the white LED anode terminal  33   c  and the infrared LED anode terminal  33   d  are formed so as to have different lengths in the direction B. 
         [0066]    Similarly, the white LED cathode terminal  33   e  is formed so as to be longer in the direction B (direction in which the white LEDs  31  and the infrared LEDs  32  are arranged) than the infrared LED cathode terminal  33   f . That is, the white LED cathode terminal  33   e  and the infrared LED cathode terminal  33   f  are formed so as to have different lengths in the direction B. 
         [0067]    The white LED anode terminal  33   c  and the white LED cathode terminal  33   e  may be formed so as to have the same length in the direction B, or may be formed so as to have different lengths in the direction B. The infrared LED anode terminal  33   d  and the infrared LED cathode terminal  33   f  may be formed so as to have the same length in the direction B, or may be formed so as to have different lengths in the direction B. 
         [0068]    As illustrated in  FIGS. 8 and 9 , the FPCs  24  and  25  are formed in an elongated shape extending in the direction A. Furthermore, the FPCs  24  and  25  are disposed on one side and the other side of the light guide plate  23  (see  FIG. 2 ) in the direction B, respectively. 
         [0069]    As illustrated in  FIG. 9 , a plurality of terminal units  24   a  to be connected to the white LED anode terminals  33   c  and the white LED cathode terminals  33   e  of the linear light sources  30  are formed on both sides (upper and lower sides) of the FPC  24  in the direction A. That is, in the first embodiment, the FPC  24  connects terminals (the white LED anode terminals  33   c  and the white LED cathode terminals  33   e ) of the two linear light sources  30  on one side in the direction B to each other, and also functions as a wiring member for the white LEDs  31 . Therefore, the FPC  24  can be shared between the two linear light sources  30 , thus making it possible to prevent an increase in the number of wiring members (FPC  24 ) for the white LEDs  31 . The terminal units  24   a  are led out to the lower side of the frame  22  (see  FIG. 1 ) (one side in the direction A) via a wiring line (not illustrated). 
         [0070]    Similarly, a plurality of terminal units  25   a  to be connected to the infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f  of the linear light sources  30  are formed on both sides (upper and lower sides) of the FPC  25  in the direction A. That is, in the first embodiment, the FPC  25  connects terminals (the infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f ) of the two linear light sources  30  on the other side in the direction B to each other, and also functions as a wiring member for the infrared LEDs  32 . Therefore, the FPC  25  can be shared between the two linear light sources  30 , thus making it possible to prevent an increase in the number of wiring members (FPC  25 ) for the infrared LEDs  32 . The terminal units  25   a  are led out to the lower side of the frame  22  (see  FIG. 1 ) (one side in the direction A) via a wiring line (not illustrated). 
         [0071]    As illustrated in  FIGS. 8 and 9 , the white LED anode terminals  33   c  and the white LED cathode terminals  33   e  of the linear light sources  30  are electrically connected to the terminal units  24   a  of the FPC  24  using solder  50 . The infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f  of the linear light sources  30  are electrically connected to the terminal units  25   a  of the FPC  25  using solder  50 . 
         [0072]    As illustrated in  FIG. 2 , the reflection sheet  26  has a function of reflecting light emitted from the rear surface of the light guide plate  23  forward (toward the light guide plate  23  side). 
         [0073]    The back chassis  27  is formed of resin or metal. The back chassis  27  has a cutout portion  27   a  through which the FPCs  24  and  25  are led out from the frame  22 . 
         [0074]    In the first embodiment, as described above, the white LED anode terminals  33   c  and the white LED cathode terminals  33   e  are provided in end portions of the substrates  33  on one side in the direction B, and the infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f  are provided in end portions of the substrates  33  on the other side in the direction B. Therefore, compared to the case where four terminals (the white LED anode terminal  33   c , the white LED cathode terminal  33   e , the infrared LED anode terminal  33   d , and the infrared LED cathode terminal  33   f ) are disposed only in, for example, one end portion of each of the substrates  33 , a projection amount by which the four terminals on each of the substrates  33  project outward from a side surface of the light guide plate  23  or the liquid crystal display panel  10  (touch panel) in the direction B can be reduced. This allows the four terminals on each of the substrates  33  to be disposed within the frame  22 . Thus, there is no need to provide projecting portions for the frame  22  or to increase the size of the frame  22 . This results in prevention of an increase in the overall size of the liquid crystal display apparatus  1 . 
         [0075]    In addition, the white LED anode terminals  33   c  and the white LED cathode terminals  33   e  are provided in end portions of the substrates  33  on one side in the direction B, and the infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f  are provided in end portions of the substrates  33  on the other side in the direction B. Therefore, the projection amount of the terminals (the white LED anode terminals  33   c  and the white LED cathode terminals  33   e ) on the substrates  33  on one side in the direction B can be made equal to that of the terminals (the infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f ) on the substrates  33  on the other side in the direction B. Thus, the contours on one side and the other side of the frame  22  can be made symmetrical with respect to, for example, the liquid crystal display panel  10 . 
         [0076]    In the first embodiment, furthermore, as described above, the white LED anode terminals  33   c  and the white LED cathode terminals  33   e  are formed separately on the main surfaces  33   a  and the back surfaces  33   b  of the substrates  33 , and the infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f  are formed separately on the main surfaces  33   a  and the back surfaces  33   b  of the substrates  33 . Therefore, compared to a case where four terminals (the white LED anode terminal  33   c , the white LED cathode terminal  33   e , the infrared LED anode terminal  33   d , and the infrared LED cathode terminal  33   f ) are formed only on, for example, the main surface  33   a  of each of the substrates  33 , the projection amount of the four terminals in the direction B can be reduced. 
         [0077]    In the first embodiment, furthermore, as described above, the white LED anode terminals  33   c  and the infrared LED anode terminals  33   d  are formed so as to have different lengths in the direction B, and the white LED cathode terminals  33   e  and the infrared LED cathode terminals  33   f  are formed so as to have different lengths in the direction B. This can make it easy to identify one side and the other side of each of the linear light sources  30 , and can therefore improve the efficiency with which work of assembling the backlight device  20  is performed. 
         [0078]    In the first embodiment, furthermore, as described above, the white LEDs  31  and the infrared LEDs  32  are alternately arranged. Therefore, uniform brightness can be achieved across the liquid crystal display panel  10 , and a reduction in detection accuracy of the touch panel (liquid crystal display panel  10 ) can also be prevented. 
         [0079]    In the first embodiment, furthermore, as described above, the two linear light sources  30  are used to cause light to enter the light guide plate  23  through the side surfaces  23   a  and  23   b  thereof. Thus, the brightness across the liquid crystal display panel  10  can be easily improved. 
         [0080]    In the first embodiment, furthermore, as described above, terminals (the white LED anode terminals  33   c  and the white LED cathode terminals  33   e ) on the two linear light sources  30  on one side are electrically connected to the FPC  24 , and terminals (the infrared LED anode terminals  33   d  and the infrared LED cathode terminals  33   f ) on the two linear light sources  30  on the other side are electrically connected to the FPC  25 . Thus, the FPCs  24  and  25  can be shared between the two linear light sources  30 , and the FPCs  24  and  25  can also be easily led out to one side (lower side) in the direction A. 
         [0081]    In addition, the FPCs  24  and  25  are disposed on one side and the other side in the direction B, respectively. Thus, compared to a case where an FPC formed by integrating the FPC  24  and the FPC  25  is disposed only on, for example, one side in the direction B, a projection amount in the direction B by which the FPC projects outward from one end surface of the light guide plate  23  or the liquid crystal display panel  10  (touch panel) in the direction B can be reduced. 
       Second Embodiment 
       [0082]    In a second embodiment, a case where, unlike in the first embodiment described above, cathode terminals are formed on one side of a substrate  133  of a linear light source  130  in the direction B and anode terminals are formed on the other side of the substrate  133  in the direction B will be described with reference to  FIGS. 10 and 11 . 
         [0083]    In the linear light source  130  according to the second embodiment of the present invention, as illustrated in  FIGS. 10 and 11 , an infrared LED cathode terminal  133   c  that functions as a cathode terminal of the infrared LEDs  32  is formed in one end portion on a main surface  133   a  of the substrate  133  in the direction B, and an infrared LED anode terminal  133   d  that functions as an anode terminal of the infrared LEDs  32  is formed in the other end portion on the main surface  133   a  of the substrate  133  in the direction B. Further, a white LED cathode terminal  133   e  that functions as a cathode terminal of the white LEDs  31  is formed in the one end portion on a back surface  133   b  of the substrate  133  in the direction B, and a white LED anode terminal  133   f  that functions as an anode terminal of the white LEDs  32  is formed in the other end portion on the back surface  133   b  of the substrate  133  in the direction B. 
         [0084]    The infrared LED cathode terminal  133   c  is an example of a “cathode terminal” according to the present invention, and the infrared LED anode terminal  133   d  is an example of an “anode terminal” according to the present invention. Further, the white LED cathode terminal  133   e  is an example of a “cathode terminal” according to the present invention, and the white LED anode terminal  133   f  is an example of an “anode terminal” according to the present invention. 
         [0085]    In the second embodiment, the FPC  24  functions as a cathode terminal wiring member, and the FPC  25  functions as an anode terminal wiring member. In the second embodiment, all the plurality of terminal units  24   a  formed on the FPC  24  may be implemented as a common unit. 
         [0086]    Other structures and other advantageous effects of the second embodiment are similar to those of the first embodiment described above. 
         [0087]    It should be considered that the embodiments disclosed herein are illustrative and not restrictive in any respects. The scope of the present invention is indicated by the claims rather than the foregoing description of the embodiments, and all changes that come within the meaning and range of equivalence of the claims are intended to be embraced. 
         [0088]    For example, in the foregoing embodiments, an example is given in which a display apparatus is applied to a liquid crystal display apparatus. However, the present invention is not limited thereto, and may be applied to a display apparatus other than a liquid crystal display apparatus. 
         [0089]    In the foregoing embodiments, furthermore, an example is given in which an LED is used as a light emitting element. However, the present invention is not limited thereto, and a light emitting element other than an LED, such as a semiconductor laser element, may be used. 
         [0090]    In the foregoing embodiments, furthermore, an example is given in which a white LED is used as a visible light emitting element. However, the present invention is not limited thereto, and a light emitting element that emits visible light other than white light may be used. 
         [0091]    In the foregoing embodiments, furthermore, an example is given in which an infrared LED is used as an invisible light emitting element. However, the present invention is not limited thereto, and a light emitting element that emits invisible light (for example, ultraviolet light) other than infrared light may be used. 
         [0092]    In the foregoing embodiments, furthermore, an example is given in which a linear light source is disposed on either side of a light guide plate in the direction A. However, the present invention is not limited thereto, and a linear light source may be disposed only on one side of a light guide plate. 
         [0093]    In the foregoing embodiments, furthermore, an example is given in which white LEDs and infrared LEDs are arranged alternately one by one. However, the present invention is not limited thereto, and white LEDs and infrared LEDs may be arranged, for example, alternately two by two, or may be arranged in any other order. 
         [0094]    In the foregoing embodiments, furthermore, an example is given in which two linear light sources are connected to each other by two FPCs. However, the present invention is not limited thereto, and two linear light sources may be connected to each other by a single FPC. That is, an FPC that connects one side of one of two linear light sources to one side of the other linear light source, and an FPC that connects the other side of one of the two linear light sources to the other side of the other linear light source may be formed by a single FPC. Alternatively, two linear light sources may not necessarily be connected to each other. 
         [0095]    In the first embodiment described above, an example is given in which anode terminals (white LED anode terminal and infrared LED anode terminal) are formed on a main surface of a substrate and in which cathode terminals (white LED cathode terminal and infrared LED cathode terminal) are formed on a back surface of the substrate. However, the present invention is not limited thereto. The cathode terminals may be formed on the main surface of the substrate, and the anode terminals may be formed on the back surface of the substrate. 
         [0096]    In the foregoing embodiments, furthermore, an example is given in which a terminal on one side of a substrate and a terminal on the other side of the substrate are formed so as to have different lengths. However, the present invention is not limited thereto, and a terminal on one side of a substrate and a terminal on the other side of the substrate may be formed so as to have different shapes. Alternatively, a terminal on one side of a substrate and a terminal on the other side of the substrate may be formed so as to have the same shape and the same length. 
         [0097]    In the foregoing embodiments, furthermore, an example is given in which the present invention is applied to an edge-light backlight device. However, the present invention is not limited thereto. The present invention may be applied to a direct backlight device. 
       REFERENCE SIGNS LIST 
       [0000]    
       
         
           
               1  liquid crystal display apparatus (display apparatus) 
               10  liquid crystal display panel (touch panel) 
               20  backlight device 
               23  light guide plate 
               23   a  side surface (first side surface) 
               23   b  side surface (second side surface) 
               24 ,  25  FPC (wiring member) 
               30 ,  130  linear light source 
               31  white LED (visible light emitting element, white light emitting element) 
               32  infrared LED (invisible light emitting element, infrared light emitting element) 
               33 ,  133  substrate 
               33   a ,  133   a  main surface 
               33   b ,  133   b  back surface 
               33   c ,  133   f  white LED anode terminal (anode terminal) 
               33   d ,  133   d  infrared LED anode terminal (anode terminal) 
               33   e ,  133   e  white LED cathode terminal (cathode terminal) 
               33   f ,  133   c  infrared LED cathode terminal (cathode terminal)