Patent Publication Number: US-2019196244-A1

Title: Electro-optical device, electronic device, and projection-type display device

Description:
BACKGROUND 
     1. Technical Field 
     The invention relates to an electro-optical device, an electronic device, and a projection-type display device. The electro-optical device is equipped with an electro-optical panel coupled with a substrate. 
     2. Related Art 
     Some electro-optical devices, such as liquid crystal display devices and organic electro-luminescence devices, are adopted with a structure where ends of a plurality of flexible substrates are overlapped with each other and coupled to an electro-optical panel (see JP-A-2010-102219). In the electro-optical device described in JP-A-2010-102219, two substrates identical to each other in shape and size wholly overlap with each other to extend. 
     In the electro-optical device described in JP-A-2010-102219, the two substrates respectively include other ends respectively provided with terminal regions. The terminal regions of the two substrates are respectively coupled to a wiring substrate. In this state, such a configuration where two substrates wholly overlap with each other, as the electro-optical device described in JP-A-2010-102219, faces difficulty in commonly coupling other ends (terminal regions) of the two substrates to a wiring substrate. In addition, with the configuration where the two substrates wholly overlap with each other, as the electro-optical device described in JP-A-2010-102219, when coupling the other ends (terminal regions) of the two substrates respectively to wiring substrates different from each other, and when coupling the other end (terminal region) of one of the substrates to one of the wiring substrates, the other one of the substrates becomes an obstruction, requiring greater time and effort for the coupling operation. 
     SUMMARY 
     An advantage of some aspects of the invention is to provide an electro-optical device, an electronic device, and a projection-type display device. The electro-optical device is capable of efficiently coupling, to a wiring substrate, other ends of a plurality of substrates respectively having ends overlapped with each other and coupled to an electro-optical panel. 
     For the issue described above, an electro-optical device according to an aspect of the invention includes an electro-optical panel, a first substrate having flexibility and including a first end coupled to the electro-optical panel and a second end disposed opposite to the first end and provided with a first terminal region arranged with a plurality of terminals, and a second substrate having flexibility and including a third end coupled to the electro-optical panel and a fourth end disposed opposite to the third end and provided with a second terminal region arranged with a plurality of terminals. When the first substrate and the second substrate are developed on a same plane, the first terminal region and the second terminal region are located at positions different from each other on the plane and do not overlap with each other in the thickness direction. 
     In the invention, the first substrate and the second substrate overlapping with each other in the thickness direction are coupled to the electro-optical panel. Therefore, the first substrate and the second substrate can be arranged within a narrower space around the electro-optical panel. Even in this case, the first terminal region and the second terminal region are located at positions different from each other in an in-plane direction of the first substrate and the second substrate, and do not overlap with each other in the thickness direction. Therefore, after the other end (terminal region) of one of the substrates is coupled to the wiring substrate, when coupling the other end (terminal region) of the other one of the substrates to the wiring substrate, the one of the substrates does not become an obstruction, achieving an efficient coupling operation. 
     In the invention, such an aspect can be adopted that, when the first substrate and the second substrate are developed on the same plane, the first substrate includes a first extended portion extending from the first end to a position toward the second end, a first terminal region forming portion including the second end and formed with the first terminal region, and a second extended portion extending from the first extended portion to the first terminal region forming portion, and the second substrate includes a third extended portion extending from the third end to a position toward the fourth end to overlap with the first extended portion in the thickness direction, a second terminal region forming portion including the fourth end and formed with the second terminal region, and a fourth extended portion bending in a direction intersecting with an extending direction of the third extended portion and extending from the third extended portion to the second terminal region forming portion to allow the first terminal region forming portion and the second terminal region forming portion to be away from each other in a direction intersecting with the extending direction of the third extended portion without being overlapped with each other in the thickness direction. According to the aspect, since the second extended portion of the first substrate and the fourth extended portion of the second substrate respectively extend in directions different from each other, the first terminal region forming portion does not overlap with the second substrate in the thickness direction, while the second terminal region forming portion does not overlap with the first substrate in the thickness direction. Therefore, after the other end (terminal region) of one of the substrates is coupled to the wiring substrate, when coupling the other end (terminal region) of the other one of the substrates to the wiring substrate, the one of the substrates does not become an obstruction, achieving an efficient coupling operation. 
     In the invention, such an aspect can be adopted that, when the first substrate and the second substrate are developed on the same plane, the first extended portion and the second extended portion extend in a same direction. According to the aspect, since the first substrate extends in a certain direction, and only the second substrate bends, the first substrate and the second substrate can be arranged within a narrower space. According to the aspect, such an aspect can be adopted that, when the first substrate and the second substrate are developed on the single plane, the first terminal region and the second terminal region each extend in a direction intersecting with an extending direction of the first extended portion. 
     In the invention, such an aspect can be adopted that, when the first substrate and the second substrate are developed on the same plane, the first substrate includes a first extended portion extending to an intermediate position from the first end toward the second end, a first terminal region forming portion including the second end and formed with the first terminal region, and a second extended portion extending from the first extended portion to the first terminal region forming portion, and the second substrate includes a third extended portion extending to an intermediate position from the third end toward the fourth end to overlap with the first extended portion in the thickness direction, a second terminal region forming portion including the fourth end and formed with the second terminal region, and a fourth extended portion extending from the third extended portion to the second terminal region forming portion to overlap with the second extended portion in the thickness direction. According to the aspect, the first terminal region forming portion also does not overlap with the second substrate in the thickness direction, while the second terminal region forming portion also does not overlap with the first substrate in the thickness direction. Therefore, after the other end (terminal region) of one of the substrates is coupled to the wiring substrate, when coupling the other end (terminal region) of the other one of the substrates to the wiring substrate, the one of the substrates does not become an obstruction, achieving an efficient coupling operation. Since the first extended portion and the third extended portion overlap with each other, as well as the second extended portion and the fourth extended portion overlap with each other, the first substrate and the second substrate can be arranged within a narrower space. According to the aspect, such an aspect can be adopted that the first terminal region and the second terminal region respectively extend in the extending direction of the first extended portion. 
     In the invention, such an aspect can be adopted that the first substrate and the second substrate extend in the same direction to lengths different from each other. Even in this case, the first terminal region and the second terminal region are located at positions different from each other in the in-plane direction of the first substrate and the second substrate, and the first terminal region and the second terminal region do not overlap with each other in the thickness direction. Therefore, after the other end (terminal region) of one of the substrates is coupled to the wiring substrate, when coupling the other end (terminal region) of the other one of the substrates to the wiring substrate, the one of the substrates does not become an obstruction, achieving an efficient coupling operation. Since the first substrate and the second substrate overlap with each other in a wider area, the first substrate and the second substrate can be arranged within a narrower space. 
     In the invention, such an aspect can be adopted that the first extended portion and the third extended portion each are mounted with a driving integrated circuit (IC). 
     In the invention, such an aspect can be adopted that the first substrate includes a third substrate mounted with the driving IC on a flexible substrate extending from an end coupled to the electro-optical panel, and a fourth substrate having flexibility, coupled to the other end of the third substrate, and provided with the first terminal region, and the second substrate includes a fifth substrate mounted with the driving IC on a flexible substrate extending from an end coupled to the electro-optical panel, and a sixth substrate having flexibility, coupled to the other end of the fifth substrate, and provided with the second terminal region. According to the aspect, expensive chip-on-film (COF) substrates (the third substrate and the fifth substrate) can be only partially used for the first substrate and the second substrate, while cost-effective extension substrates (the fourth substrate and the sixth substrate) can be used for the first substrate and the second substrate to achieve appropriate lengths. 
     In the invention, such an aspect can be adopted that the third substrate and the fifth substrate are identical in shape and length. According to the aspect, the expensive COF substrates with identical specifications can be used for the first substrate and the second substrate, achieving a cost reduction. 
     In an electronic device equipped with an electro-optical device applied with the invention, such an aspect can be adopted that, in a state where the first substrate and the second substrate respectively bend in a direction identical to the thickness direction at intermediate positions in the extending direction, the first terminal region and the second terminal region are coupled to a wiring substrate. In this case, such an aspect can be adopted that the first terminal region and the second terminal region are coupled in common to the wiring substrate. According to the aspect, the first substrate and the second substrate can share the wiring substrate, achieving a cost reduction. 
     In a projection-type display device, equipped with a plurality of electro-optical devices applied with the invention, such an aspect can be adopted that includes a light source unit configured to emit light source light to be incident to each of the plurality of electro-optical devices, a cross dichroic prism configured to synthesize light modulated by each of the plurality of electro-optical devices, and a projection optical system configured to project imaging light emitted from an emission surface of the cross dichroic prism. The plurality of electro-optical devices include a first electro-optical device facing a first incident surface facing the emission surface of the cross dichroic prism, a second electro-optical device facing a second incident surface lying between the emission surface and the first incident surface of the cross dichroic prism, and a third electro-optical device facing a third incident surface facing the second incident surface of the cross dichroic prism. In each of the first electro-optical device, the second electro-optical device, and the third electro-optical device, in a state where the first substrate and the second substrate each bend in the thickness direction toward an opposite side to the cross dichroic prism at intermediate positions in the extending direction, the first terminal region and the second terminal region are coupled to a wiring substrate. In this case, such an aspect can be adopted that the first terminal region and the second terminal region are coupled in common to the wiring substrate. According to the aspect, the first substrate and the second substrate can share the wiring substrate, achieving a cost reduction. 
     In a projection-type display device, equipped with a plurality of electro-optical devices applied with the invention, such an aspect can be adopted that includes a light source unit configured to emit light source light to be incident to each of the plurality of electro-optical devices, a cross dichroic prism configured to synthesize light modulated by the plurality of electro-optical devices, and a projection optical system configured to project imaging light emitted from an emission surface of the cross dichroic prism. The plurality of electro-optical devices include a first electro-optical device facing a first incident surface facing the emission surface of the cross dichroic prism, a second electro-optical device facing a second incident surface lying between the emission surface and the first incident surface of the cross dichroic prism, and a third electro-optical device facing a third incident surface facing the second incident surface of the cross dichroic prism. In each of the first electro-optical device, the second electro-optical device, and the third electro-optical device, in a state where the first substrate and the second substrate each bend in the thickness direction toward an opposite side to the cross dichroic prism at intermediate positions in the extending direction, the first terminal region and the second terminal region are coupled to a wiring substrate. In each of the second electro-optical device and the third electro-optical device, the fourth extended portion bends in a direction to be away from the projection optical system. 
     In a projection-type display device according to the invention, such an aspect can be adopted that, in each of the second electro-optical device and the third electro-optical device, the first extended portion, the second extended portion, the third extended portion, and the fourth extended portion do not protrude from a virtual surface including the emission surface toward the projection optical system. According to the aspect, a space for arranging actuators, for example, each configured to perform focusing-driving in a projection optical system, and a movable region for the projection optical system, for example, can be secured around the virtual surface. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is an explanatory view illustrating an aspect of a planar configuration of a main part of a projection-type display device representing an example of an electronic device applied with the invention. 
         FIG. 2  is an explanatory view of the main part illustrated in  FIG. 1  when viewed from a side. 
         FIG. 3  is an explanatory view of an optical unit used in the projection-type display device illustrated in  FIG. 1 . 
         FIG. 4  is an explanatory view illustrating a detailed configuration of the optical unit illustrated in  FIG. 1 . 
         FIG. 5  is an explanatory view schematically illustrating an aspect of the electro-optical device according to Exemplary Embodiment 1 of the invention when viewed diagonally. 
         FIG. 6  is an exploded perspective view of the electro-optical device illustrated in  FIG. 5  with an electro-optical panel and a holder removed from each other. 
         FIG. 7  is an explanatory view schematically illustrating a planar configuration of the electro-optical device illustrated in  FIG. 5 . 
         FIG. 8  is an explanatory view illustrating a cross-sectional configuration of the electro-optical device illustrated in  FIG. 5 . 
         FIG. 9  is a perspective view schematically illustrating the electro-optical devices illustrated in  FIG. 7  and other drawings, arranged around a cross dichroic prism. 
         FIG. 10  is a plan view schematically illustrating the electro-optical devices illustrated in  FIG. 7  and other drawings, arranged around the cross dichroic prism. 
         FIG. 11  is an explanatory view schematically illustrating a planar configuration of an electro-optical device according to Exemplary Embodiment 2 of the invention. 
         FIG. 12  is an explanatory view schematically illustrating the electro-optical devices illustrated in  FIG. 11  arranged around a cross dichroic prism. 
         FIG. 13  is an explanatory view schematically illustrating a planar configuration of an electro-optical device according to Exemplary Embodiment 3 of the invention. 
         FIG. 14  is an explanatory view schematically illustrating the electro-optical devices illustrated in  FIG. 13  arranged around a cross dichroic prism. 
         FIG. 15  is an explanatory view schematically illustrating electro-optical devices arranged around a cross dichroic prism in a projection-type display device (electronic device), according to Exemplary Embodiment 4 of the invention. 
         FIG. 16  is an exploded perspective view of an electro-optical device according to Exemplary Embodiment 5 of the invention. 
         FIG. 17  is an explanatory view illustrating a cross-sectional configuration of the electro-optical device illustrated in  FIG. 16 . 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Exemplary embodiments of the invention will now be described herein with reference to the accompanying drawings. Note that, in each of the drawings to be referenced in the descriptions below, to make members and the like recognizable in terms of size in the drawings, the members and the like are illustrated in different scales, and a number of terminals and other like components is reduced. For an electronic device (projection-type display device), a rectangular coordinate system based on a, b, and c axes is used to represent directions. For an electro-optical device, a rectangular coordinate system based on x, y, and z axes is used to represent directions. 
     Exemplary Embodiment 1 
     Configuration of Projection-Type Display Device (Electronic Device) 
       FIG. 1  is an explanatory view illustrating an aspect of a planar configuration of a main part of a projection-type display device representing an example of an electronic device applied with the invention.  FIG. 2  is an explanatory view of the main part illustrated in  FIG. 1  when viewed from a side.  FIG. 3  is an explanatory view of an optical unit used in the projection-type display device illustrated in  FIG. 1 . On a rear end side of a projection-type display device  200  illustrated in  FIGS. 1 and 2 , outer packaging cases  202  and  205  are internally arranged with a power supply unit  207 , as well as arranged with a light source unit  208  and an optical unit  209  lying adjacent to each other on a device front side, i.e., in front of the power supply unit  207  (on a side b 1  in a b axis direction). Inside the outer packaging case  202 , a base end side of a projection optical system  206  lies at a center of the device front side and in front of the optical unit  209 . On a side al in an a axis direction, the optical unit  209  is arranged, in a device front-rear direction (the b axis direction), with an interface board  211  mounted with an input and output interface circuit. A video board  212  mounted with a video signal processing circuit is further arranged in parallel to the interface board  211 . Above the optical unit  209  including the light source unit  208  (on a side cl in a c axis direction), a control board  213  for device driving control is arranged. At respective left and right corners on a device front end side, speakers  214 R and  214 L are arranged. 
     Above and below the optical unit  209 , intake fans  215 A and  215 B for device internal cooling are arranged. On a device side surface, i.e., behind the light source unit  208 , an exhaust fan  216  is arranged. Further, at a position facing ends of the interface board  211  and the video board  212 , an auxiliary cooling fan  217  configured to introduce cooling air from the intake fan  215 A into the power supply unit  207  is arranged. Among the fans, the intake fan  215 B functions as a cooling fan (cooling device) for an electro-optical panel  100  described later. 
     In  FIG. 3 , optical elements configuring the optical unit  209  are supported by an upper light guide  251  or a lower light guide  252  made of metal, such as Mg or Al, including a cross dichroic prism  220  configuring colored light synthesizing means. The upper light guide  251  and the lower light guide  252  are respectively secured to an upper case  203  and a lower case  204  with screws. 
     Detailed Configuration of Optical Unit  209   
       FIG. 4  is an explanatory view illustrating a detailed configuration of the optical unit  209  illustrated in  FIG. 1 . As illustrated in  FIG. 4 , the optical unit  209  includes a light source lamp  905  (the light source unit  208 ), an illumination optical system  923  including integrator lenses  921  and  922  serving as uniform illumination optical elements, a colored light separation optical system  924  configured to separate a light flux W to be emitted from the illumination optical system  923  into light fluxes R, G, and B respectively of red, green, and blue. The optical unit  209  further includes three transmission-type electro-optical devices  1 (R),  1 (G), and  1 (B) serving as electro-optical panels (light valves) configured to modulate the colored light fluxes, the cross dichroic prism  220  serving as a colored light synthesizing optical system configured to synthesize the modulated colored light fluxes, and the projection optical system  206  configured to magnification-project the synthesized light flux onto a projection surface. A relay optical system  927  configured to guide the blue colored light flux B among the colored light fluxes separated by the colored light separation optical system  924  to the corresponding electro-optical device  1 (B) is further included. The illumination optical system  923  includes a reflecting mirror  931  to bend at a right angle an optical axis La of light emitted from the light source lamp  905  in a device front direction. The integrator lenses  921  and  922  are arranged to pinch the reflecting mirror  931  to be orthogonal to each other in the front-rear direction. 
     The colored light separation optical system  924  includes a blue-green reflecting dichroic mirror  941 , a green reflecting dichroic mirror  942 , and a reflecting mirror  943 . First, with the blue-green reflecting dichroic mirror  941 , the blue colored light flux B and the green colored light flux G included in the light flux W and passed through the illumination optical system  923  are reflected at right angles to head toward the green reflecting dichroic mirror  942 . The red colored light flux R passes through the blue-green reflecting dichroic mirror  941 , is reflected at a right angle with the reflecting mirror  943  lying behind the blue-green reflecting dichroic mirror  941 , and emits from an emitter  944  for red colored light flux to the colored light synthesizing optical system. Next, with the green reflecting dichroic mirror  942 , among the blue and green light fluxes B and G reflected with the blue-green reflecting dichroic mirror  941 , only the green colored light flux G is reflected at a right angle, and emits from an emitter  945  for green colored light flux to the colored light synthesizing optical system. The blue colored light flux B that passed through the green reflecting dichroic mirror  942  emits from an emitter  946  for blue colored light flux to the relay optical system  927 . In the exemplary embodiment, set distances from an emitter for light fluxes of the illumination optical system  923  to the emitters  944 ,  945 , and  946  for colored light fluxes in the colored light separation optical system  924  are all almost identical to each other. 
     Adjacent to emission-sides of the emitters  944  and  945  for red colored light flux and green colored light flux in the colored light separation optical system  924 , condensing lenses  951  and  952  are respectively arranged. Therefore, a red colored light flux and a green colored light flux respectively emitted from the emitters are to be incident to the condensing lenses  951  and  952 , and are thus paralleled. The paralleled red and green light fluxes R and G are respectively aligned in polarizing directions by polarizing plates  960 (R) and  960 (G), and are to be incident to the electro-optical devices  1 (R) and  1 (G), then, are modulated and are added with image information corresponding to the kinds of the colored light. That is, the electro-optical devices  1 (R) and  1 (G) are switching-controlled by driving means (not illustrated) with image signals corresponding to the image information, accordingly the colored light as thus passed is modulated. For the driving means described above, known means can be used as is. 
     On the other hand, the blue colored light flux B passes through the relay optical system  927 , is further aligned by a polarizing plate  960 (B) in a polarizing direction, guided to the corresponding electro-optical device  1 (B), and, in here, similarly modulated in accordance with the image information. The relay optical system  927  includes a condensing lens  974 , an incident-side reflecting mirror  971 , an emission-side reflecting mirror  972 , an intermediate lens  973  arranged between the mirrors described above, and a condensing lens  953  arranged in front of the electro-optical device  1 (B). Among lengths of optical paths of the colored light fluxes, i.e., distances from the light source lamp  905  to respective liquid crystal panels, the length of the blue colored light flux B is greatest. Therefore, in the blue colored light flux B, a loss in light quantity becomes maximum. However, by providing the relay optical system  927 , a loss in light quantity can be suppressed. 
     The colored light fluxes passing through the electro-optical devices  1 (R),  1 (G), and  1 (B) and thus modulated are to be incident to polarizing plates  961 (R),  961 (G), and  961 (B). Light passed through the polarizing plates  961 (R),  961 (G), and  961 (B) is to be incident to the cross dichroic prism  220 , and thus is synthesized. Imaging light synthesized in here passes through the projection optical system  206  including a plurality of lens systems, and is magnification-projected onto a projection-target surface Lb, such as a screen, lying at a predetermined position. 
     Configuration of Electro-Optical Device  1   
     A configuration of each of the electro-optical devices  1  will be described herein with reference to  FIGS. 5 to 8 .  FIG. 5  is an explanatory view schematically illustrating an aspect of the electro-optical device  1  according to Exemplary Embodiment 1 of the invention when viewed diagonally.  FIG. 6  is an exploded perspective view of the electro-optical device  1  illustrated in  FIG. 5 , with the electro-optical panel  100  and a holder  70  removed from each other.  FIG. 7  is an explanatory view schematically illustrating a planar configuration of the electro-optical device  1  illustrated in  FIG. 5 .  FIG. 8  is an explanatory view illustrating a cross-sectional configuration of the electro-optical device  1  illustrated in  FIG. 5 , schematically illustrating the electro-optical device  1  being cut along the electro-optical panel  100  and a second substrate  32 . Basic configurations of the electro-optical devices  1 (R),  1 (G), and  1 (B) illustrated in  FIG. 4  are identical to each other. Therefore, when configurations shared among the electro-optical devices  1 (R),  1 (G), and  1 (B) are described, (R), (G), and (B) respectively indicative of the corresponding colors are not used, but simply referred to as the electro-optical device  1 .  FIGS. 5 to 8  each illustrate a first substrate  31  and the second substrate  32  developed on the same. 
     In  FIGS. 5, 6, 7, and 8 , the electro-optical device  1  includes the electro-optical panel  100 , a plurality of substrates (the first substrate  31  and the second substrate  32 ) coupled to a side of the electro-optical panel  100 , and the holder  70  configured to support the electro-optical panel  100  from both of sides in a thickness direction (a z axis direction). The electro-optical device  1  is a liquid crystal device configuring a light valve, for example, described with reference to  FIG. 4  and other drawings. The electro-optical device  1  includes a liquid crystal panel serving as the electro-optical panel  100 . 
     In the electro-optical panel  100 , a counter substrate  102  formed with a common electrode (not illustrated), for example, is bonded to an element substrate  101  formed with pixel electrodes  118 , for example, with a sealant (not illustrated). In the electro-optical panel  100 , a region surrounded by the sealant is provided with a liquid crystal layer (not illustrated). The electro-optical panel  100  according to the exemplary embodiment is a transmission type liquid crystal panel. Therefore, the element substrate  101  and the counter substrate  102  are each made of a transmissive substrate, such as heat-resisting glass or a quartz substrate. 
     In the electro-optical panel  100 , a region arranged with the pixel electrodes  118  in an x axis direction and a y axis direction represents a pixel region  110 . In the electro-optical panel  100 , a region overlapping with the pixel region  110  represents a display region. The element substrate  101  has a protrusion  105  protruded from the counter substrate  102  in the y axis direction. Along an edge (side  105   a ) of the protrusion  105 , a plurality of terminals including first terminals  161  for image signal entry are arranged at predetermined pitches. Between the first terminals  161  and the pixel region  110  on the protrusion  105 , a plurality of terminals including second terminals  162  for image signal entry are arranged at predetermined pitches. Therefore, the first terminals  161  and the second terminals  162  are away from each other in the y axis direction, and arranged along an edge of the element substrate  101 . In  FIGS. 6 and 7 , the first terminals  161  and the second terminals  162  are arranged at positions identical to each other in the x axis direction. However, the first terminals  161  and the second terminals  162  may be away from each other each at a ½ pitch in the x axis direction. 
     In the electro-optical panel  100 , light source light L (see  FIG. 5  and other drawings) entering from the counter substrate  102 , being modulated, and emitted from the element substrate  101  emits as display light. The electro-optical panel  100  has dust-proof glass laminated and arranged on at least one of a surface, opposite to the element substrate  101 , of the counter substrate  102  and a surface, opposite to the counter substrate  102 , of the element substrate  101 . In the exemplary embodiment, the electro-optical panel  100  has first dust-proof glass  103  laminated and arranged, via an adhesive, for example, on the surface, opposite to the element substrate  101 , of the counter substrate  102 , and second dust-proof glass  104  laminated, arranged, and bonded, via an adhesive, for example, to the surface, opposite to the counter substrate  102 , of the element substrate  101 . 
     The holder  70  includes a first holder member  71  made of metal and configured to support the electro-optical panel  100  from a side z 1  in the thickness direction (the z axis direction), and a second holder member  72  made of metal and configured to support the electro-optical panel  100  from another side z 2  in the thickness direction. The first holder member  71  and the second holder member  72  are coupled together through such a method as bolts (not illustrated) that are screwed into holes  711  and  721  respectively formed in the first holder member  71  and the second holder member  72 , for example. The first holder member  71  and the second holder member  72  are respectively formed with openings  712  and  722  allowing light source light and display light to pass through at positions overlapped with the display region (the pixel region  110 ) of the electro-optical panel  100 . The holder  70  may be in an aspect having a heat sink (not illustrated) protruding toward a side in the y axis direction and partially overlapping with the first substrate  31  and the second substrate  32 , to be described later. 
     In the electro-optical device  1 , the electro-optical panel  100  is coupled with a plurality of substrates. In the exemplary embodiment, the electro-optical panel  100  is coupled with two substrates (the first substrate  31  and the second substrate  32 ). Specifically, the electro-optical device  1  includes the first substrate  31  having flexibility and including an end representing a first end  311  coupled to the element substrate  101  of the electro-optical panel  100 , and the second substrate  32  overlapped with the first substrate  31  in the thickness direction, and having flexibility, and moreover including an end representing a third end  321  coupled to the element substrate  101  of the electro-optical panel  100 . The first substrate  31  and the second substrate  32  extend from the electro-optical panel  100  in the y axis direction. The first substrate  31  has a surface  316  and another surface  317 . The surface  316  lying opposite to the second substrate  32  is formed with a plurality of first output electrodes  315  on the first end  311  overlapping with the element substrate  101 . The plurality of first output electrodes  315  are respectively coupled to the first terminals  161 . The second substrate  32  has a surface  326  and another surface  327 . The surface  326  facing the first substrate  31  is formed with a plurality of second output electrodes  325  on the third end  321  overlapping with the element substrate  101 . The plurality of second output electrodes  325  are respectively coupled to the second terminals  162 . The first substrate  31  has a second end  312  representing another end opposite to the first end  311 . The second end  312  is provided with a first terminal region  319  arranged with a plurality of terminals (not illustrated). The second substrate  32  has a fourth end  322  representing another end opposite to the third end  321 . The fourth end  322  is provided with a second terminal region  329  arranged with a plurality of terminals (not illustrated). The first terminal region  319  and the second terminal region  329  are to respectively electrically be coupled with a higher control circuit, for example, via a wiring substrate described later. 
     In the exemplary embodiment, as described below, when the first substrate  31  and the second substrate  32  are developed on the same plane (on an x-y plane), the first terminal region  319  and the second terminal region  329  are located at positions different from each other on the plane described above, and do not overlap with each other in the thickness direction. When attached to a product, the first substrate  31  and the second substrate  32  are respectively folded. Therefore, the term “developed on a single plane” means that the folded substrates are stretched on a plane. 
     More specifically, as illustrated in  FIG. 7 , the first substrate  31  includes a first extended portion  313  linearly extending in the y axis direction to an intermediate position from the first end  311  toward the second end  312 , a first terminal region forming portion  318  including the second end  312  and formed with the first terminal region  319 , and a second extended portion  314  linearly extending in the y axis direction from the first extended portion  313  to the first terminal region forming portion  318 . In the first terminal region forming portion  318 , the second end  312  (the first terminal region  319 ) of the first substrate  31  extends in the x axis direction orthogonal to an extending direction of the first extended portion  313  and the second extended portion  314 . 
     The second substrate  32  includes a third extended portion  323  extending in the y axis direction to an intermediate position from the third end  321  toward the fourth end  322  to overlap with the first extended portion  313  in the thickness direction (the z axis direction), a second terminal region forming portion  328  including the fourth end  322  and formed with the second terminal region  329 , and a fourth extended portion  324  extending from the third extended portion  323  to the second terminal region forming portion  328 . So as not to allow the first terminal region forming portion  318  and the second terminal region forming portion  328  to be away from each other in a direction intersecting with the extending direction of the third extended portion  314 , and overlap with each other in the thickness direction, the fourth extended portion  324  bends diagonally in a direction intersecting with the extending direction of the third extended portion  323  to extend from the third extended portion  323  to the second terminal region forming portion  328 . In the second terminal region forming portion  328 , the fourth end  322  (the second terminal region  329 ) extends in the x axis direction orthogonal to the extending direction of the first extended portion  313  and the third extended portion  323  to a position away in the x axis direction orthogonal to the extending direction of the first extended portion  313  and the third extended portion  323  from the second end  312  (the first terminal region  319 ) of the first substrate  31 . 
     On the surface  316  of the first substrate  31 , the first extended portion  313  is mounted with electronic components  516 , such as a first driving IC  21  and a capacitor. An image signal, for example, is thus to be output from the first driving IC  21 , via the first substrate  31 , to the electro-optical panel  100 . On the surface  326  of the second substrate  32 , the third extended portion  323  is mounted with electronic components  526 , such as a second driving IC  22  and a capacitor. An image signal, for example, is thus to be output from the second driving IC  22 , via the second substrate  32 , to the electro-optical panel  100 . 
     As described above, in the electro-optical device  1  according to the exemplary embodiment, the first extended portion  313  of the first substrate  31  and the third extended portion  323  of the second substrate  32  overlapping with each other linearly extend. Therefore, the first substrate  31  and the second substrate  32  can be arranged within a narrower space around the electro-optical panel  100 . Even in this case, the second extended portion  314  of the first substrate  31  and the fourth extended portion  324  of the second substrate  32  separated away from each other in the x axis direction extend. Therefore, the first terminal region  319  (the first terminal region forming portion  318 ) and the second terminal region  329  (the second terminal region forming portion  328 ) separated away from each other in an in-plane direction of the first substrate  31  and the second substrate  32  do not overlap with each other in the thickness direction. Therefore, the first terminal region  319  of the first substrate  31  and the second terminal region  329  of the second substrate  32  can be coupled in common to a wiring substrate, achieving an efficient coupling operation. That is, after one of the first substrate  31  and the second substrate  32  is coupled in common to the wiring substrate secured beforehand to a frame of an electronic device, for example, when coupling the other one of the substrates, the one of the substrates does not become an obstruction, allowing the substrates to be efficiently coupled. When coupling the first terminal region  319  and the second terminal region  329  of the second substrate  32  respectively to separate wiring substrates, after one of the first substrate  31  and the second substrate  32  is coupled to one of the wiring substrates, when coupling the other one of the substrates, the one of the substrates does not become an obstruction, allowing the substrates to be efficiently coupled. 
     Example of Mounting Electro-Optical Device  1  onto Projection-Type Display Device  200   
       FIG. 9  is a perspective view schematically illustrating the electro-optical devices  1  illustrated in  FIG. 7  and other drawings, arranged around the cross dichroic prism  220 .  FIG. 10  is a plan view schematically illustrating the electro-optical devices  1  illustrated in  FIG. 7  and other drawings, arranged around the cross dichroic prism  220 . 
     As illustrated in  FIGS. 9 and 10 , in the exemplary embodiment, when mounting each of the electro-optical devices  1 (R),  1 (G), and  1 (B) onto the projection-type display device  200  (electronic device), while the first substrate  31  and the second substrate  32  respectively bend in a direction identical to the thickness direction at intermediate positions in the extending direction, the first terminal region  319  and the second terminal region  329  are coupled in common to a wiring substrate  80  (a first wiring substrate  81 , a second wiring substrate  82 , and a third wiring substrate  83 ). 
     In the exemplary embodiment, the plurality of electro-optical devices  1  are arranged around the cross dichroic prism  220 . More specifically, the electro-optical device  1 (G) serving as a first electro-optical device is arranged to face a first incident surface  221  facing an emission surface  225  of the cross dichroic prism  220 . The electro-optical device  1 (R) serving as a second electro-optical device is arranged to face a second incident surface  222  lying between the emission surface  225  and the first incident surface  221  of the cross dichroic prism  220 . The electro-optical device  1 (B) serving as a third electro-optical device is arranged to face a third incident surface  223  facing the second incident surface  222  of the cross dichroic prism  220 . 
     In each of the three electro-optical devices  1 (R),  1 (G), and  1 (B), the first substrate  31  and the second substrate  32  are respectively arranged to bend in the thickness direction toward an opposite side to the cross dichroic prism  220  at intermediate positions in the extending direction. In this state, the first terminal region  319  and the second terminal region  329  are coupled in common to the wiring substrate  80  (the first wiring substrate  81 , the second wiring substrate  82 , and the third wiring substrate  83 ) arranged in parallel to incident light emitted to each of the electro-optical devices  1 (R),  1 (G), and  1 (B). Therefore, in each of the electro-optical devices  1 (R),  1 (G), and  1 (B), without hindered by tip sides of the first substrate  31  and the second substrate  32  and the wiring substrate  80 , an optical path of incident light to each of the electro-optical devices  1 (R),  1 (G), and  1 (B) can be secured. 
     In the exemplary embodiment, the first terminal region  319  and the second terminal region  329  respectively serve as plugs for a board-to-board connector, for example. Therefore, the first wiring substrate  81 , the second wiring substrate  82 , and the third wiring substrate  83  are each formed with a socket  801  of the board-to-board connector to be inserted with the first terminal region  319 , and a socket  802  of the board-to-board connector to be inserted with the second terminal region  329 . In the exemplary embodiment, in the wiring substrate  80 , the sockets  801  and  802  are arranged adjacent to each other in an extending direction of the sockets  801  and  802 . Therefore, the first terminal region  319  and the second terminal region  329  can be respectively easily inserted into the sockets  801  and  802 . In each of the three electro-optical devices  1 (R),  1 (G), and  1 (B), the first terminal region  319  of the first substrate  31  and the second terminal region  329  of the second substrate  32  are coupled in common to the wiring substrate  80 , achieving a cost reduction. 
     Among the three electro-optical devices  1 (R),  1 (G), and  1 (B), the electro-optical devices  1 (G) and  1 (B) each have the configuration illustrated in  FIG. 7 . On the other hand, even though the electro-optical device  1 (R) has a basic configuration identical to a basic configuration of the electro-optical device  1 (B), a bending direction of the fourth extended portion  324  is opposite to a bending direction of the electro-optical device  1 (B). Therefore, the first substrates  31  of the electro-optical devices  1 (R) and  1 (B) both lying on the front side (the side b 1  in the b axis direction) arranged with the projection optical system  206  are linearly arranged. That is, the fourth extended portions  324  of the second substrates  32  of the electro-optical devices  1 (R) and  1 (B) bend toward an opposite side to the projection optical system  206 . Therefore, on each of the electro-optical devices  1 (R) and  1 (B), in the first substrate  31  and the second substrate  32 , a whole of the substrates including the first extended portion  313 , the second extended portion  314 , the first terminal region forming portion  318 , the third extended portion  323 , the fourth extended portion  324 , and the second terminal region forming portion  328  described with reference to  FIG. 7  does not protrude from a virtual surface F including the emission surface  225  toward the projection optical system  206 . Therefore, a space for arranging actuators, for example, each configured to perform focusing-driving in the projection optical system  206 , and a movable region for the projection optical system  206 , for example, can be secured around the virtual surface F. 
     Exemplary Embodiment 2 
       FIG. 11  is an explanatory view schematically illustrating a planar configuration of an electro-optical device  1  according to Exemplary Embodiment 2 of the invention.  FIG. 12  is an explanatory view schematically illustrating the electro-optical devices  1  illustrated in  FIG. 11  arranged around the cross dichroic prism  220 . Note that a basic configuration of the electro-optical device  1  according to Exemplary Embodiment 2 and basic configurations of electro-optical devices  1  according to Exemplary Embodiments 3, 4, and 5 described below are the same as the basic configuration of the electro-optical device  1  according to Exemplary Embodiment 1. Hence, corresponding reference signs are given to corresponding components, and corresponding descriptions are omitted. 
     As illustrated in  FIG. 11 , the electro-optical device  1  according to the exemplary embodiment includes, similar to Exemplary Embodiment 1, the first substrate  31  having flexibility and including the first end  311  coupled to an end of the element substrate  101  of the electro-optical panel  100 , and the second substrate  32  overlapped with the first substrate  31  in the thickness direction and having flexibility, and moreover including the third end  321  coupled to the end of the element substrate  101  of the electro-optical panel  100 . The first substrate  31  and the second substrate  32  extend from the electro-optical panel  100  in the y axis direction. 
     On the first substrate  31 , the first terminal region  319  arranged with a plurality of terminals (not illustrated) is provided on the second end  312  lying opposite to the first end  311 . On the second substrate  32 , the second terminal region  329  arranged with a plurality of terminals (not illustrated) is provided on the fourth end  322  lying opposite to the third end  321 . The first terminal region  319  and the second terminal region  329  are electrically coupled with a higher control circuit, for example. 
     In the exemplary embodiment, as described below, when the first substrate  31  and the second substrate  32  are developed on the same plane (on an x-y plane), the first terminal region  319  and the second terminal region  329  are located at positions different from each other on the plane described above, and do not overlap with each other in the thickness direction. 
     More specifically, the first substrate  31  includes the first extended portion  313  extending in the y axis direction to an intermediate position from the first end  311  toward the second end  312 , the first terminal region forming portion  318  including the second end  312  and formed with the first terminal region  319 , and the second extended portion  314  extending in the y axis direction from the first extended portion  313  to the first terminal region forming portion  318 . The first terminal region forming portion  318  protrudes in the x axis direction from the second extended portion  314 . The first end  312  (the first terminal region  319 ) of the first substrate  31  extends in the x axis direction orthogonal to the extending direction of the second extended portion  314 . 
     The second substrate  32  includes the third extended portion  323  extending in the y axis direction to an intermediate position from the third end  321  toward the fourth end  322  to overlap with the first extended portion  313  in the thickness direction (the z axis direction), the second terminal region forming portion  328  including the fourth end  322  and formed with the second terminal region  329 , and the fourth extended portion  324  extending from the third extended portion  313  to the second terminal region forming portion  328 . The fourth extended portion  324  extends from the third extended portion  324  to the second terminal region forming portion  328  to overlap with the second extended portion  314  in the thickness direction. The second terminal region forming portion  328  protrudes from the fourth extended portion  324  in the x axis direction toward an opposite side to the first terminal region forming portion  318 . Therefore, the second end  312  (the first terminal region  319 ) of the first substrate  31  and the fourth end  322  (the second terminal region  329 ) of the second substrate  32  respectively extend in the extending direction (y axis direction) of the first extended portion  313  to positions away from each other in the x axis direction. 
     On the surface  316  of the first substrate  31 , the first extended portion  313  is mounted with the electronic components  516 , such as the first driving IC  21  and a capacitor. On the surface  326  of the second substrate  32 , the third extended portion  323  is mounted with the electronic components  526 , such as the second driving IC  22  and a capacitor. 
     In the exemplary embodiment, a distance from the first end  311  to the first driving IC  21  on the first substrate  31  and a distance from the third end  321  to the second driving IC  22  on the second substrate  32  are identical to each other. A distance from the electro-optical panel  100  to the second end  312  of the first substrate  31  and a distance from the electro-optical panel  100  to the fourth end  322  of the second substrate  32  are identical to each other. However, such an aspect may be adopted that the fourth end  322  of the second substrate  32  is closer to the electro-optical panel  100  than the second end  312  of the first substrate  31  by a gap in the y axis direction between the first terminals  161  and the second terminals  162 . According to the aspect, a length from the first end  311  to the second end  312  on the first substrate  31  and a length from the third end  321  to the fourth end  322  on the second substrate  32  are identical to each other. Therefore, a wiring distance from the second end  312  to the first driving IC  21  and a wiring distance from the fourth end  322  to the second driving IC  22  can be made identical to each other. Also, a wiring distance from the first driving IC  21  to the first end  311  and a wiring distance from the second driving IC  22  to the third end  321  can be made identical to each other. 
     As described above, in the electro-optical device  1  according to the exemplary embodiment, the first substrate  31  and the second substrate  32  overlapped with each other in the thickness direction are coupled to the electro-optical panel  100 . The first extended portion  313  of the first substrate  31  and the third extended portion  323  of the second substrate  32  overlapped with each other linearly extend. Therefore, the first substrate  31  and the second substrate  32  can be arranged within a narrower space around the electro-optical panel  100 . 
     Even in this case, the second extended portion  314  of the first substrate  31  and the fourth extended portion  324  of the second substrate  32  separated away from each other in the x axis direction extend. Therefore, the first terminal region  319  and the second terminal region  329  do not overlap with each other in the thickness direction. Therefore, the other end (the second end  312  and the first terminal region  319 ) of the first substrate  31  and the other end (the fourth end  322  and the second terminal region  329 ) of the second substrate  32  can be coupled in common to a wiring substrate, achieving an efficient coupling operation, for example, similar to Exemplary Embodiment 1. 
     As illustrated in  FIG. 12 , when mounting the electro-optical device  1  according to the exemplary embodiment onto the projection-type display device  200  (electronic device), similar to Exemplary Embodiment 1, while the first substrate  31  and the second substrate  32  respectively bend in a direction identical to the thickness direction at intermediate positions in the extending direction, the first terminal region  319  and the second terminal region  329  are coupled in common to the wiring substrate  80 . More specifically, in each of the three electro-optical devices  1 (R),  1 (G), and  1 (B), the first substrate  31  and the second substrate  32  are respectively arranged to bend in the thickness direction toward the opposite side to the cross dichroic prism  220  at intermediate positions in the extending direction. The three electro-optical devices  1 (R),  1 (G), and  1 (B) have configurations identical to each other, and are arranged in a rotational symmetry manner about the cross dichroic prism  220 . In this state, the first extended portion  313 , the second extended portion  314 , the third extended portion  323 , and the fourth extended portion  324  described with reference to  FIG. 11  do not protrude from the virtual surface F including the emission surface  225  toward the projection optical system  206 . Therefore, a space for arranging actuators, for example, each configured to perform focusing-driving in the projection optical system  206 , and a movable region for the projection optical system  206 , for example, can be secured around the virtual surface F. The first terminal region  319  and the second terminal region  329  are coupled in common to the wiring substrate  80  (the first wiring substrate  81 , the second wiring substrate  82 , and the third wiring substrate  83 ) arranged in parallel to incident light emitted to each of the electro-optical devices  1 (R),  1 (G), and  1 (B). Therefore, in each of the electro-optical devices  1 (R),  1 (G), and  1 (B), without hindered by the tip sides of the first substrate  31  and the second substrate  32  and the wiring substrate  80 , an optical path of incident light to each of the electro-optical devices  1 (R),  1 (G), and  1 (B) can be secured. 
     Even in the exemplary embodiment, similar to Exemplary Embodiment 1, the first terminal region  319  and the second terminal region  329  respectively serve as plugs for a board-to-board connector, for example. Therefore, the first wiring substrate  81 , the second wiring substrate  82 , and the third wiring substrate  83  are each formed with the socket  801  of the board-to-board connector to be inserted with the first terminal region  319 , and the socket  802  of the board-to-board connector to be inserted with the second terminal region  329 . In the exemplary embodiment, the sockets  801  and  802  are arranged in parallel to each other. Therefore, the first terminal region  319  and the second terminal region  329  can be respectively easily inserted into the sockets  801  and  802 . In each of the three electro-optical devices  1 (R),  1 (G), and  1 (B), the first terminal region  319  of the first substrate  31  and the second terminal region  329  of the second substrate  32  are coupled in common to the wiring substrate  80 , achieving a cost reduction. 
     In the exemplary embodiment, the first terminal region forming portion  318  and the second terminal region forming portion  328  respectively bend at right angles to be opposite to each other from the second extended portion  314  and the fourth extended portion  324 . However, such an aspect may be adopted that the first terminal region forming portion  318  and the second terminal region forming portion  328  respectively bend diagonally in directions opposite to each other from the second extended portion  314  and the fourth extended portion  324 , and then extend in the y axis direction. In this case, similar to Exemplary Embodiment 1, such an aspect may be adopted that the second end  312  (the first terminal region  319 ) of the first substrate  31  extends in the x axis direction orthogonal to the extending direction of the first extended portion  313  to a position away in the x axis direction orthogonal to the extending direction of the first extended portion  313  from the fourth end  322  (the second terminal region  329 ) of the second substrate  32 . In the exemplary embodiment, the first terminal region forming portion  318  and the second terminal region forming portion  328  respectively bend at right angles to be opposite to each other from the second extended portion  314  and the fourth extended portion  324 . However, such an aspect may be adopted that only the first terminal region forming portion  318  protrudes from the second extended portion  314 , for example. 
     Exemplary Embodiment 3 
       FIG. 13  is an explanatory view schematically illustrating a planar configuration of an electro-optical device  1  according to Exemplary Embodiment 3 of the invention.  FIG. 14  is an explanatory view schematically illustrating the electro-optical devices  1  illustrated in  FIG. 13  arranged around the cross dichroic prism  220 . 
     As illustrated in  FIG. 13 , the electro-optical device  1  according to the exemplary embodiment includes, similar to Exemplary Embodiment 1, the first substrate  31  having flexibility and including the first end  311  coupled to the end of the element substrate  101  of the electro-optical panel  100 , and the second substrate  32  overlapped with the first substrate  31  in the thickness direction and having flexibility, and moreover including the third end  321  coupled to the end of the element substrate  101  of the electro-optical panel  100 . The first substrate  31  and the second substrate  32  extend from the electro-optical panel  100  in the y axis direction. 
     The first substrate  31  and the second substrate  32  respectively linearly extend in a single direction to lengths different from each other. Therefore, the second end  312  (the first terminal region  319 ) of the first substrate  31  and the fourth end  322  (the second terminal region  329 ) of the second substrate  32  are located at positions different from each other in the in-plane direction of the first substrate  31  and the second substrate  32 , and do not overlap with each other in the thickness direction. In the exemplary embodiment, the first substrate  31  is longer than the second substrate  32 . Therefore, the second end  312  (the first terminal region  319 ) of the first substrate  31  and the second substrate  32  do not overlap with each other, but the fourth end  322  (the second terminal region  329 ) of the second substrate  32  overlaps with an intermediate position, in the extending direction, of the first substrate  31 . 
     As illustrated in  FIG. 14 , when mounting the electro-optical device  1  according to the exemplary embodiment onto the projection-type display device  200  (electronic device), similar to Exemplary Embodiment 1, while the first substrate  31  and the second substrate  32  respectively bend in a direction identical to the thickness direction at intermediate positions in the extending direction, the first terminal region  319  and the second terminal region  329  are coupled to the wiring substrate  80 . More specifically, in each of the three electro-optical devices  1 (R),  1 (G), and  1 (B), the first substrate  31  and the second substrate  32  are respectively arranged to bend in the thickness direction toward the opposite side to the cross dichroic prism  220  at intermediate positions in the extending direction. Therefore, the first terminal region  319  and the second terminal region  329  are coupled in common to the wiring substrate  80  (the first wiring substrate  81 , the second wiring substrate  82 , and the third wiring substrate  83 ) arranged in parallel to incident light to each of the electro-optical devices  1 (R),  1 (G), and  1 (B). Therefore, in each of the electro-optical devices  1 (R),  1 (G), and  1 (B), without hindered by the tip sides of the first substrate  31  and the second substrate  32  and the wiring substrate  80 , an optical path of incident light to each of the electro-optical devices  1 (R),  1 (G), and  1 (B) can be secured. The three electro-optical devices  1 (R),  1 (G), and  1 (B) respectively have configurations identical to each other, and are arranged in a rotational symmetry manner about the cross dichroic prism  220 . 
     Even in the exemplary embodiment, similar to Exemplary Embodiment 1, the first terminal region  319  and the second terminal region  329  respectively serve as plugs for a board-to-board connector, for example. Therefore, the first wiring substrate  81 , the second wiring substrate  82 , and the third wiring substrate  83  are each formed with the socket  801  of the board-to-board connector to be inserted with the first terminal region  319 , and the socket  802  of the board-to-board connector to be inserted with the second terminal region  329 . In the exemplary embodiment, the sockets  801  and  802  are arranged in parallel to each other. The first terminal region  319  and the second terminal region  329  do not overlap with each other in the thickness direction. Therefore, after the other end (the second end  312  and the first terminal region  319 ) of the first substrate  31  is coupled to the wiring substrate  80 , when coupling the other end (the fourth end  322  and the second terminal region  329 ) of the second substrate  32  to the wiring substrate  80 , the first substrate  31  does not become an obstruction, achieving an efficient coupling operation. In each of the electro-optical devices  1 (R) and  1 (B), the first substrate  31  and the second substrate  32  do not protrude from the virtual surface including the emission surface  225  toward the side b 1  (a side of the projection optical system  206  illustrated in  FIG. 1 ) in the b axis direction. Therefore, a space for arranging actuators, for example, each configured to perform focusing-driving in the projection optical system  206 , and a movable region for the projection optical system  206 , for example, can be secured around the cross dichroic prism  220 . 
     Exemplary Embodiment 4 
       FIG. 15  is an explanatory view schematically illustrating electro-optical devices  1  arranged around the cross dichroic prism  220  in a projection-type display device  200  (electronic device), according to Exemplary Embodiment 4 of the invention. In the exemplary embodiment, the electro-optical device  1  is similar to the electro-optical device  1  according to Exemplary Embodiment 3 described with reference to  FIG. 13 , and the first substrate  31  and the second substrate  32  respectively linearly extend in a single direction to lengths different from each other. In the exemplary embodiment, the first substrate  31  is longer than the second substrate  32 . Therefore, the second end  312  (the first terminal region  319 ) of the first substrate  31  and the second substrate  32  do not overlap with each other, but the fourth end  322  (the second terminal region  329 ) of the second substrate  32  overlaps with an intermediate position, in the extending direction, of the first substrate  31 . 
     As illustrated in  FIG. 15 , when mounting the electro-optical device  1  according to the exemplary embodiment onto the projection-type display device  200  (electronic device), similar to Exemplary Embodiment 3, while the first substrate  31  and the second substrate  32  respectively bend in a direction identical to the thickness direction at intermediate positions in the extending direction, the first terminal region  319  and the second terminal region  329  are coupled to the wiring substrate  80 . More specifically, in each of the three electro-optical devices  1 (R),  1 (G), and  1 (B), the first substrate  31  and the second substrate  32  are respectively arranged to bend in the thickness direction toward the opposite side to the cross dichroic prism  220  at intermediate positions in the extending direction, and the first terminal region  319  and the second terminal region  329  are coupled to the wiring substrate  80 . 
     In each of the three electro-optical devices  1 (R),  1 (G), and  1 (B), the first terminal region  319  is away from the cross dichroic prism  220  farther than the second terminal region  329 . Therefore, in the electro-optical device  1 (G), the first terminal region  319  of the first substrate  31  is coupled to a socket  806  of a wiring substrate  861 , while the second terminal region  329  is coupled to a socket  807  of another wiring substrate  862  partially overlapping with the wiring substrate  861 . In the electro-optical device  1 (R), the first terminal region  319  of the first substrate  31  is coupled to a socket  806  of a wiring substrate  871 , while the second terminal region  329  is coupled to a socket  807  of another wiring substrate  872  overlapping with the wiring substrate  871 . In the electro-optical device  1 (B), the first terminal region  319  of the first substrate  31  is coupled to a socket  806  of the wiring substrate  881 , while the second terminal region  329  is coupled to a socket  807  of another wiring substrate  882  overlapping with the wiring substrate  881 . 
     In the exemplary embodiment, as described above, the first substrate  31  and the second substrate  32  overlapping with each other extend in a single direction, but the first terminal region  319  and the second terminal region  329  do not overlap with each other in the thickness direction. Therefore, after the second terminal region  329  is coupled to the wiring substrate  882 , when coupling the first terminal region  319  to the wiring substrate  881 , the second substrate  32  does not become an obstruction, achieving an easy coupling operation. Even in the exemplary embodiment, similar to Exemplary Embodiment 3, in each of the electro-optical devices  1 (R) and  1 (B), the first substrate  31  and the second substrate  32  do not protrude from the virtual surface including the emission surface  225  toward the side b 1  (a side of the projection optical system  206  illustrated in  FIG. 1 ) in the b axis direction. Therefore, a space for arranging actuators, for example, each configured to perform focusing-driving in the projection optical system  206 , and a movable region for the projection optical system  206 , for example, can be secured around the cross dichroic prism  220 . 
     Exemplary Embodiment 5 
       FIG. 16  is an exploded perspective view of an electro-optical device  1  according to Exemplary Embodiment 5 of the invention.  FIG. 17  is an explanatory view illustrating a cross-sectional configuration of the electro-optical device  1  illustrated in  FIG. 16 . As illustrated in  FIG. 16 , the electro-optical device  1  according to the exemplary embodiment also includes, similar to Exemplary Embodiment 2, the first substrate  31  having flexibility and including the first end  311  coupled to the element substrate  101  of the electro-optical panel  100 , and the second substrate  32  overlapping with the first substrate  31  in the thickness direction and having flexibility, and moreover including the third end  321  coupled to the element substrate  101  of the electro-optical panel  100 . The first substrate  31  and the second substrate  32  extend from the electro-optical panel  100  in the y axis direction. On the first substrate  31 , the first terminal region  319  arranged with a plurality of terminals (not illustrated) is provided on the second end  312  lying opposite to the first end  311 . On the second substrate  32 , the second terminal region  329  arranged with a plurality of terminals (not illustrated) is provided on the fourth end  322  lying opposite to the third end  321 . 
     In the electro-optical device  1  configured as described above, the first substrate  31  includes a third substrate  51  mounted with the first driving IC  21  on a flexible substrate linearly extending from an end  511  coupled to the electro-optical panel  100 , and a fourth substrate  41  having flexibility and including an end  411  coupled to another end  512  of the third substrate  51 . Another end  412  of the fourth substrate  41  is provided with the first terminal region  319 . The third substrate  51  configures the first extended portion  313  described with reference to  FIG. 11 . The fourth substrate  41  configures the second extended portion  314  and the first terminal region forming portion  318  described with reference to  FIG. 11 . 
     The second substrate  32  includes, similar to the first substrate  31 , a fifth substrate  52  mounted with the second driving IC  22  on a flexible substrate linearly extending from an end  521  coupled to the electro-optical panel  100 , and a sixth substrate  42  having flexibility and including an end  421  coupled to another end  522  of the fifth substrate  52 . Another end  422  of the sixth substrate  42  is provided with the second terminal region  329 . The fifth substrate  52  configures the third extended portion  323  described with reference to  FIG. 11 . The sixth substrate  42  configures the fourth extended portion  324  and the second terminal region forming portion  328  described with reference to  FIG. 11 . 
     According to the aspect, expensive chip-on-film (COF) substrates (the third substrate  51  and the fifth substrate  52 ) can be only partially used for the first substrate  31  and the second substrate  32 , while cost-effective extension substrates (the fourth substrate  41  and the sixth substrate  42 ) can be used for the first substrate  31  and the second substrate  32  to achieve appropriate lengths. Therefore, a cost reduction can be achieved. 
     The third substrate  51  and the fifth substrate  52  are identical in shape and length, for example, and are respectively formed of COF substrates with identical specifications. Therefore, a cost reduction can be achieved. 
     In the aspect of the electro-optical device  1  according to Exemplary Embodiment 2, the first substrate  31  and the second substrate  32  are each formed of a COF substrate and an extension substrate coupled to each other. The aspect may be applied to the electro-optical devices  1  according to Exemplary Embodiments 1, 3, and 4. 
     Other Exemplary Embodiments 
     In Exemplary Embodiments described above, as for the two substrates coupled to and overlap with the electro-optical panel  100 , a lower one (adjacent to the electro-optical panel  100 ) of the substrates is specified to the “second substrate”, while an upper one (away from the electro-optical panel  100 ) of the substrates is specified to the “first substrate”. However, the lower one (adjacent to the electro-optical panel  100 ) of the substrates may be specified to the “first substrate”, while the upper one (away from the electro-optical panel  100 ) of the substrates may be specified to the “second substrate”. 
     In Exemplary Embodiments 1 and 2 described above, the first terminal region  319  and the second terminal region  329  are coupled in common to the wiring substrate  80 . However, even in Exemplary Embodiments 1 and 2 described above, similar to Exemplary Embodiment 4, the first terminal region  319  and the second terminal region  329  may be respectively coupled to other wiring substrates  80  different from each other. 
     In each of Exemplary Embodiments described above, the number of the substrates coupled to the electro-optical panel  100  is two. However, the invention may be applied when a number of substrates is three or more. 
     In each of Exemplary Embodiments described above, the first terminal region  319  and the second terminal region  329  are coupled to the wiring substrate  80  via connectors. However, the invention may be applied when the first terminal region  319  and the second terminal region  329  are coupled to the wiring substrate  80  through soldering or with an anisotropic conductive film. 
     In each of Exemplary Embodiments described above, the electro-optical device  1  is equipped with the transmission type electro-optical panel  100 . However, the invention may be applied when the electro-optical device  1  is equipped with a reflection type electro-optical panel  100 . 
     In each of Exemplary Embodiments described above, the electro-optical panel  100  is a liquid crystal panel. However, the invention may be applied when the electro-optical panel  100  is an organic electro-luminescence display panel, a plasma display panel, a field emission display (FED) panel, a surface-conduction electron-emitter display (SED) panel, a light emitting diode (LED) display panel, or an electrophoresis display panel, for example. 
     The projection-type display device  200  described above may be configured to use, as a light source unit, an LED light source configured to emit light in various colors, and the like to supply light in various colors emitted from the LED light source to another liquid crystal device. 
     In each of Exemplary Embodiments described above, the projection-type display device  200  is used as an electronic device equipped with the electro-optical device  1  applied with the invention. However, the invention may be applied to electro-optical devices  1  used in electronic devices including projection type head-up displays (HUDs), direct-view type head-mounted displays (HMDs), personal computers, digital still cameras, and liquid crystal televisions, for example. 
     The entire disclosure of Japanese Patent Application No. 2017-247351, filed Dec. 25, 2017 is expressly incorporated by reference herein.