Patent Publication Number: US-2021181520-A1

Title: Display device

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of U.S. application Ser. No. 16/364,671 filed Mar. 26, 2019, which is based on and claims priority under 35 U.S.C. 119 from Japanese Patent Application No. 2018-059468 filed on Mar. 27, 2018. The contents of the above applications are incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Technical Field 
     The invention relates to an optical unit using a panel provided with a light emitting element, and a display device. 
     2. Related Art 
     As an optical unit using a panel provided with a light emitting element, and a display device, an aspect is conceivable in which three organic electroluminescent panels emitting light of each color are arranged facing incident surfaces of three dichroic prisms. With this optical unit and display device, while red image light emitted from the red color organic electroluminescent panel is reflected by a first dichroic mirror toward an emission surface, the first dichroic mirror allows blue image light emitted from the blue color organic electroluminescent panel and green image light emitted from the green color organic electroluminescent panel to pass through. Further, while the blue image light emitted from the blue color organic electroluminescent panel is reflected by a second dichroic mirror toward an emission surface, the second dichroic mirror allows the red image light emitted from the red color organic electroluminescent panel and the green image light emitted from the green color organic electroluminescent panel to pass through. Thus, synthesized light that is a synthesis of the images of the red light, the green light, and the blue light is emitted from the emission surfaces of the dichroic prisms, and a color image can thus be displayed (refer to JP-A-11-67448). Here, in the organic electroluminescent panel, normally, a plurality of organic electroluminescent elements are provided on a display region of a substrate, and wiring and the like is provided in a peripheral region surrounding the display region. 
     While the light emitted from a light emitting panel such as the organic electroluminescent panel includes oblique light that is significantly inclined with respect to a device optical axis, due to an influence of incident angle dependence of a dichroic mirror and the like, some of the color light that should be reflected sometimes passes through the dichroic mirror. In this case, the light that has passed through the dichroic mirror is obliquely incident on the peripheral region of another of the organic electroluminescent panels. Further, some of the color light that should pass through is reflected by the dichroic mirror, and is obliquely incident on the peripheral region of the organic electroluminescent panel concerned. In this case, the light that is incident on the peripheral region is obliquely reflected and becomes stray light, and there is a risk that the stray light may cause a quality of a displayed image to deteriorate. 
     SUMMARY 
     In light of the foregoing, an object of the invention is to provide an optical unit and a display device capable of suppressing the occurrence of stray light, by suppressing the incidence of light onto a peripheral region of a panel. 
     In order to solve the above-described problem, an aspect of an optical unit according to the invention includes a first panel provided with a first light-emitting element in a first display region that is a display region of a first substrate, a second panel provided with a second light-emitting element in a second display region that is a display region of a second substrate, a third panel provided with a third light-emitting element in a third display region that is a display region of a third substrate, and a dichroic prism. The dichroic prism is provided with a first incident surface that is disposed to face the first panel and on which image light emitted from the first display region is incident as first image light of a first wavelength range, a second incident surface that faces the first incident surface and that is disposed so as to face the second panel, and on which image light emitted from the second display region is incident as second image light of a second wavelength range that is different from the first wavelength range, and a third incident surface provided between the first incident surface and the second incident surface, and disposed to face the third panel, and on which image light emitted from the third display region is incident as third image light of a third wavelength range that is different from the first wavelength range and the second wavelength range. The dichroic prism is also provided with an emission surface that faces the third incident surface, a first dichroic mirror configured to reflect the first image light toward the emission surface and transmit the second image light and the third image light, and a second dichroic mirror configured to reflect the second image light toward the emission surface and transmit the first image light and the third image light. A light shielding layer that absorbs the light of the first wavelength range, the light of the second wavelength range, and the light of the third wavelength range is provided between the dichroic prism and a peripheral region surrounding the display region of at least one substrate of the first substrate, the second substrate, and the third substrate. 
     According to the invention, since the light shielding layer is provided between the dichroic prism and the peripheral region of the substrate of the panel, even when a part of color light that should be reflected passes through the dichroic mirror, or when part of the color light that should be transmitted is reflected by the dichroic mirror, the leaked light is blocked by the light shielding layer. Thus, the reflection of the leaked light on the peripheral region of the substrate can be suppressed, and as a result, the occurrence of stray light caused by the light reflected by the peripheral region of the substrate can be suppressed. 
     According to the invention, an aspect can be adopted in which a plurality of layers of wiring are provided in the peripheral region, and the light shielding layer is provided between the dichroic prism and the metal wiring, of the plurality of layers of wiring, positioned closest to the dichroic prism. 
     According to the invention, an aspect can be adopted in which, the light shielding layer is provided between the dichroic prism and the peripheral region surrounding the display region of another substrate, different from the one substrate, of the first substrate, the second substrate, and the third substrate. 
     According to the invention, an aspect can be adopted in which, the light shielding layer is provided between the dichroic prism and the peripheral region surrounding the display region of a remaining substrate, different from the one substrate and the other substrate, of the first substrate, the second substrate, and the third substrate. 
     According to the invention, an aspect can be adopted in which the light shielding layer is configured by a black filter layer including black particles, a light-absorbent metal layer, or a light-absorbent metal compound layer. 
     According to the invention, an aspect can be adopted in which a first coloring layer configured to color image light emitted from the first light-emitting element to be the first image light of the first wavelength range is provided in the first display region, a second coloring layer configured to color image light emitted from the second light-emitting element to be the second image light of the second wavelength range is provided in the second display region, and a third coloring layer configured to color image light emitted from the third light-emitting element to be the third image light of the third wavelength range is provided in the third display region. The light shielding layer is configured by providing, between the peripheral region of the substrate and the dichroic prism, a first color filter layer configured by the same material as the first coloring layer, a second color filter layer configured by the same material as the second coloring layer, and a third color filter layer configured by the same material as the third coloring layer, overlapping. 
     According to the invention, an aspect can be adopted in which the first color filter layer, the second color filter layer, and the third color filter layer are provided in the peripheral region of the first substrate, the first color filter layer, the second color filter layer, and the third color filter layer are provided in the peripheral region of the second substrate, and the first color filter layer, the second color filter layer, and the third color filter layer are provided in the peripheral region of the third substrate. 
     According to the invention, an aspect can be adopted in which, in the peripheral region of the first substrate, the second color filter layer and the third color filter layer are provided between the first substrate and the first color filter layer, in the peripheral region of the second substrate, the first color filter layer and the third color filter layer are provided between the second substrate and the second color filter layer, and in the peripheral region of the third substrate, the first color filter layer and the second color filter layer are provided between the third substrate and the third color filter layer. 
     According to the invention, an aspect can be adopted in which, of the first color filter layer, the second color filter layer, and the third color filter layer, only the first color filter layer is provided in the peripheral region of the first substrate, of the first color filter layer, the second color filter layer, and the third color filter layer, only the second color filter layer is provided in the peripheral region of the second substrate, and of the first color filter layer, the second color filter layer, and the third color filter layer, only the third color filter layer is provided in the peripheral region of the third substrate. 
     According to the invention, an aspect can be adopted in which the first color filter layer, the second color filter layer, and the third color filter layer are light-absorbent. 
     According to the invention, an aspect can be adopted in which a transmissive cover substrate is adhered to the one substrate, on a side of the dichroic prism, and the light shielding layer is provided between the one substrate and the cover substrate. 
     According to the invention, an aspect can be adopted in which a transmissive cover substrate is adhered to the one substrate, on a side of the dichroic prism, and the light shielding layer is provided between the cover substrate and the dichroic prism. 
     According to the invention, an aspect can be adopted in which, the light shielding layer is provided in a position separated from an effective luminous flux corresponding to a luminous flux emitted from the emission surface, of a luminous flux of image light emitted toward the dichroic prism from the display region of the one substrate. 
     According to the invention, an aspect can be adopted in which, the light shielding layer is provided in a position separated from an effective luminous flux used in display of an image, of a luminous flux of image light emitted toward the dichroic prism from the display region of the one substrate. 
     According to a display device provided with the optical unit to which the invention is applied, the display device is configured to display an image using synthesized light of the first image light, the second image light, and the third image light emitted from the emission surface of the dichroic prism. 
     According to a display device according to the invention, an aspect can be adopted in which the display device includes a virtual display unit configured to display a virtual image using the synthesized light. 
     According to the display device according to the invention, an aspect can be adopted in which the display device includes a projection optical system configured to project the synthesized light. 
    
    
     
       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 a plan view of an optical unit according to a first exemplary embodiment of the invention. 
         FIG. 2  is an explanatory diagram illustrating transmittance-wavelength characteristics of a first coloring layer and the like illustrated in  FIG. 1 . 
         FIG. 3  is an explanatory diagram illustrating a spectrum of first image light and the like illustrated in  FIG. 1 . 
         FIG. 4  is a graph illustrating transmittance-wavelength characteristics of a first dichroic mirror illustrated in  FIG. 1 . 
         FIG. 5  is a graph illustrating transmittance-wavelength characteristics of a second dichroic mirror illustrated in  FIG. 1 . 
         FIG. 6  is an explanatory diagram illustrating an electrical configuration of a first panel illustrated in  FIG. 1 . 
         FIG. 7  is a circuit diagram of each of pixels (pixel circuits) in a first display region illustrated in  FIG. 6 . 
         FIG. 8  is a cross-sectional view of the first panel illustrated in  FIG. 1 . 
         FIG. 9  is a cross-sectional view of a second panel illustrated in  FIG. 1 . 
         FIG. 10  is a cross-sectional view of a third panel illustrated in  FIG. 1 . 
         FIG. 11  is an explanatory diagram illustrating effects of a light shielding layer and the like illustrated in  FIG. 1 . 
         FIG. 12  is a plan view of the optical unit according to a second exemplary embodiment of the invention. 
         FIG. 13  is an explanatory diagram of the light shielding layer provided between the first panel and the dichroic mirror illustrated in  FIG. 12 . 
         FIG. 14  is a plan view of the optical unit according to a third exemplary embodiment of the invention. 
         FIG. 15  is an explanatory diagram illustrating a first example of a forming range of the light shielding layer in the optical unit to which the invention is applied. 
         FIG. 16  is an explanatory diagram illustrating a second example of the forming range of the light shielding layer in the optical unit to which the invention is applied. 
         FIG. 17  is an explanatory diagram of a head-mounted display device. 
         FIG. 18  is a perspective view schematically illustrating a configuration of an optical system of a display unit illustrated in  FIG. 17 . 
         FIG. 19  is an explanatory diagram illustrating optical paths of the optical system illustrated in  FIG. 18 . 
         FIG. 20  is an explanatory diagram of a projection-type display device. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Exemplary embodiments of the invention will be described. Note that in the drawings referred to in the description below, to illustrate each layer or each member at a recognizable size on the drawings, a number and scale of each layer or each member is different. 
     First Exemplary Embodiment 
     Overall Configuration 
       FIG. 1  is a plan view of an optical unit  1  according to a first exemplary embodiment of the invention.  FIG. 2  is an explanatory diagram illustrating transmittance-wavelength characteristics of a first coloring layer  81 (R) and the like illustrated in  FIG. 1 .  FIG. 3  is an explanatory diagram illustrating a spectrum of first image light LR and the like illustrated in  FIG. 1 . 
     As illustrated in  FIG. 1 , the optical unit  1  includes a first panel  10  provided with a plurality of first light-emitting elements  15  in a first display region  111  that is a display region of a first substrate  11 , a second panel  20  provided with a plurality of second light-emitting elements  25  in a second display region  211  that is a display region of a second substrate  21 , a third panel  30  provided with a plurality of light-emitting elements  35  in a display region  311  that is a display region of a third substrate  31 , and a dichroic prism  50 . 
     The first panel  10  emits the first image light LR of a first wavelength range from the first display region  111 , and the second panel  20  emits second image light LB of a second wavelength range from the second display region  211 . The third panel  30  emits third image light LG of a third wavelength range from the third display region  311 . In the exemplary embodiment, the first wavelength range is from 620 nm to 750 nm, for example, and the first panel  10  emits the red color first image light LR. The second wavelength range is from 450 nm to 495 nm, for example, and the second panel  20  emits the blue color second image light LB. The third wavelength range is from 495 nm to 570 nm, for example, and the third panel  30  emits the green color third image light LG. 
     In the exemplary embodiment, as a result of emitting white light from the plurality of first light-emitting elements  15  provided in the first display region  111 , in the first substrate  11 , on the side of the dichroic prism  50  with respect to the first light-emitting elements  15 , the first panel  10  has a first coloring layer  81 (R) that colors the image light emitted from the first light-emitting elements  15  to be into the first image light LR of the first wavelength range. As a result of emitting white light from the plurality of second light-emitting elements  25  provided in the second display region  211 , in the second substrate  21 , on the side of the dichroic prism  50  with respect to the second light-emitting elements  25 , the second panel  20  has a second coloring layer  81 (B) that colors the image light emitted from the second light-emitting elements  25  to be the second image light LB of the second wavelength range. As a result of emitting white light from the plurality of third light-emitting elements  35  provided in the third display region  311 , in the third substrate  31 , on the side of the dichroic prism  50  with respect to the third light-emitting elements  35 , the third panel  30  has a third coloring layer  81 (G) that colors the image light emitted from the third light-emitting elements  35  to be the third image light LG of the third wavelength range. In the exemplary embodiment, the first light-emitting elements  15 , the second light-emitting elements  25 , and the third light-emitting elements  35  are all the organic electroluminescent elements. 
     In the exemplary embodiment, the first coloring layer  81 (R) has the transmittance-wavelength characteristics indicated by a dashed line P 81 (R) in  FIG. 2 , and is a light-absorbing filter layer that absorbs light other than the red light. The second coloring layer  81 (B) has the transmittance-wavelength characteristics indicated by a one-dot chain line P 81 (B) in FIG.  2 , and is a light absorbing filter layer that absorbs light other than the blue light. The third coloring layer  81 (G) has the transmittance-wavelength characteristics indicated by a two-dot chain line P 81 (G) in  FIG. 2 , and is a light absorbing filter layer that absorbs light other than the green light. Thus, the first image light LR has a spectrum indicated by a dashed line LR in  FIG. 3 , the second image light LB has a spectrum indicated by a one-dot chain line LB in  FIG. 3 , and the third image light LG has a spectrum indicated by a two-dot chain line LG in  FIG. 3 . 
     The dichroic prism  50  includes a first incident surface  51 , a second incident surface  52  that faces the first incident surface  51 , a third incident surface  53  that is provided between the first incident surface  51  and the second incident surface  52 , and an emission surface  54  that faces the third incident surface  53 . The first panel  10  is arranged so as to face the first incident surface  51 , and the first image light LR emitted from the first panel  10  is incident on the first incident surface  51 . The second panel  20  is arranged so as to face the second incident surface  52 , and the second image light LB emitted from the second panel  20  is incident on the second incident surface  52 . The third panel  30  is arranged so as to face the third incident surface  53 , and the third image light LG emitted from the third panel  30  is incident on the third incident surface  53 . In the exemplary embodiment, the first incident surface  51  and the first panel  10  are fixed by a transmissive adhesive  19 , the second incident surface  52  and the second panel  20  are fixed by a transmissive adhesive  29 , and the third incident surface  53  and the third panel  30  are fixed by a transmissive adhesive  39 . 
     The dichroic prism  50  includes a first dichroic mirror  56 , and a second dichroic mirror  57  that are arranged so as to intersect each other at a 45 degree angle. 
     Optical Characteristics of Dichroic Prism  50   
       FIG. 4  is a graph illustrating transmittance-wavelength characteristics of the first dichroic mirror  56  illustrated in  FIG. 1 .  FIG. 5  is a graph illustrating transmittance-wavelength characteristics of the second dichroic mirror  57  illustrated in  FIG. 1 . 
     As indicated by a solid line La 45  in  FIG. 4 , of light that is incident at the 45 degree angle, the first dichroic mirror  56  allows the light having a wavelength of 550 nm or less to pass through and reflects the light having a wavelength of 600 nm or greater. Further, of the light having a wavelength from 550 nm to 600 nm, the longer the wavelength, the lower the transmittance. Thus, the first dichroic mirror  56  reflects the first image light LR toward the emission surface  54  and allows the second image light LB and the third image light LG to pass through. 
     As indicated by a solid line Lb 45  in  FIG. 5 , of light that is incident at the 45 degree angle, the second dichroic mirror  57  allows the light having a wavelength of 520 nm or greater to pass through and reflects the light having a wavelength of 490 nm or less. Further, of the light having a wavelength from 490 nm to 520 nm, the longer the wavelength, the greater the transmittance. Thus, the second dichroic mirror  57  reflects the second image light LB toward the emission surface  54  and allows the first image light LR and the third image light LG to pass through. Thus, the dichroic prism  50  emits, from the emission surface  54 , a color image obtained by synthesizing the first image light LR emitted from the first panel  10 , the second image light LB emitted from the second panel  20 , and the third image light LG emitted from the third panel  30 . 
     Note that the transmittance and the reflectance of the first dichroic mirror  56  are incident angle dependent. For example, with respect to the first dichroic mirror  56 , as indicated by a dashed line La 38  in  FIG. 4 , the wavelength range that passes through shifts more to the long wavelength side when the incident angle is 38 degrees than when the incident angle is 45 degrees, and as indicated by a one-dot chain line La 52  in  FIG. 4 , the wavelength range that passes through shifts more to the short wavelength side when the incident angle is 52 degrees than when the incident angle is 45 degrees. Note that, similarly to the first dichroic mirror  56 , the transmittance and the reflectance of the second dichroic mirror  57  are incident angle dependent. For example, for the second dichroic mirror  57 , as indicated by a dashed line Lb 38  in  FIG. 5 , the wavelength range that passes through shifts more to the long wavelength side when the incident angle is 38 degrees than when the incident angle is 45 degrees, and as indicated by a one-dot chain line Lb 52  in  FIG. 5 , the wavelength range that passes through shifts more to the short wavelength side when the incident angle is 52 degrees than when the incident angle is 45 degrees. 
     Electrical Configuration of First Panel  10   
       FIG. 6  is an explanatory diagram illustrating an electrical configuration of the first panel  10  illustrated in  FIG. 1 .  FIG. 7  is a circuit diagram of each of pixels (pixel circuits) in the first display region  111  illustrated in  FIG. 6 . Note that, in the following explanation, an “upper layer side” and an “upper surface” refer to an opposite side to the first substrate  11 . 
     As illustrated in  FIG. 6 , in the first panel  10 , the first display region  111 , a peripheral region  112 , and a mounting region  113  are provided on one surface of the first substrate  11 . In the exemplary embodiment, the first substrate  11  is a silicon semiconductor substrate or the like. In the first substrate  11 , the first display region  111  is a rectangular region in which a plurality of pixels P are arrayed. A plurality of scanning lines  62  that extend in an X direction, a plurality of control lines  64  that extend in the X direction in correspondence to each of the scanning lines  62 , and a plurality of signal lines  61  that extend in a Y direction intersecting the X direction are formed in the first display region  111 . The pixels P are formed corresponding to each intersection of the plurality of scanning lines  62  and the plurality of signal lines  61 . Thus, the plurality of pixels P are arrayed in a matrix over the X direction and the Y direction. 
     The peripheral region  112  is a rectangular frame-shaped region that surrounds the periphery of the first display region  111 . A drive circuit  41  is provided in the peripheral region  112 . The drive circuit  41  is a circuit that drives each of the pixels P inside the first display region  111 , and is configured so as to include two scanning line drive circuits  42  and a signal line drive circuit  44 . The first panel  10  of the exemplary embodiment is a circuit incorporating display device in which the drive circuit  41  is configured by active elements, such as a transistor, formed directly on the surface of the first substrate  11 . 
     The mounting region  113  is a region on the opposite side of the first display region  111  with the peripheral region  112  positioned therebetween, and a plurality of mounting terminals  47  are arrayed in the mounting region  113 . Control signals and a power supply potential are supplied to each of the mounting terminals  47  from various external circuits (not illustrated), such as a control circuit and a power supply circuit. The external circuits are mounted on a flexible circuit board (not illustrated) that is bonded to the mounting region  113 , for example. 
     As illustrated in  FIG. 7 , the pixel P is configured so as to include the first light-emitting element  15 , a drive transistor TDR, a light emission control transistor TEL, a selection transistor TSL, and a capacitative element C. Note that, in  FIG. 7 , each of the transistors T (TDR, TEL, and TSL) of the pixel P are p-channel type transistors, but n-channel type transistors can also be used. 
     The first light-emitting element  15  is an electro-optical element in which a light-emitting functional layer  46  that includes a light-emitting layer of an organic EL material is interposed between a first electrode E 1  (a positive electrode) and a second electrode E 2  (a negative electrode). The first electrode E 1  is formed individually for each of the pixels P, and the second electrode E 2  is continuous across the plurality of pixels P. The first light-emitting element  15  is arranged on a current path that connects a first power supply conductor  48  and a second power supply conductor  49 . The first power supply conductor  48  is a power supply line to which a higher-side power supply potential (a first potential) VEL is supplied, and the second power supply conductor  49  is a power supply line to which a lower-side power supply potential (a second potential) VCT is supplied. 
     The drive transistor TDR and the light emission control transistor TEL are arranged on the current path that connects the first power supply conductor  48  and the second power supply conductor  49 , in series with the first light-emitting element  15 . Specifically, one side (the source) of a pair of current terminals of the drive transistor TDR is connected to the first power supply conductor  48 . The light emission control transistor TEL functions as a switch that controls a conductive state (conductive/non-conductive) between the other side (the drain) of the pair of current terminals of the drive transistor TDR, and the first electrode E 1  of the first light-emitting element  15 . The drive transistor TDR generates a drive current of an amperage corresponding to a voltage between a gate and the source of the drive transistor TDR. In a state in which the light emission control transistor TEL is controlled to be ON, the drive current is supplied from the drive transistor TDR to the first light-emitting element  15  via the light emission control transistor TEL, and the light-emitting element  15  thus emits light at a luminance corresponding to the amperage of the drive current. In a state in which the light emission control transistor TEL is controlled to be OFF, the supply of the drive current to the first light-emitting element  15  is cut off, and the light-emitting element  15  is thus extinguished. A gate of the light emission control transistor TEL is connected to the control line  64 . 
     The selection transistor TSL functions as a switch that controls a conductive state (conductive/non-conductive) between the signal line  61  and the gate of the drive transistor TDR. A gate of the selection transistor TSL is connected to the scanning line  62 . Further, the capacitative element C is an electrostatic capacitance obtained by interposing a dielectric substance between a first electrode C 1  and a second electrode C 2 . The first electrode C 1  is connected to the gate of the drive transistor TDR, and the second electrode C 2  is connected to the first power supply conductor  48  (the source of the drive transistor TDR). Thus, the capacitative element C holds the voltage between the gate and source of the drive transistor TDR. 
     The signal line drive circuit  44  supplies a grayscale potential (a data signal) depending on a grayscale specified for each of the pixels P by an image signal supplied from an external circuit, to the plurality of signal lines  61 , in parallel, for each write period (horizontal scanning period). Meanwhile, by supplying a scanning signal to each of the scanning lines  62 , each of the scanning line drive circuits  42  sequentially selects each of the plurality of scanning lines  62  for each write period. The selection transistor TSL of each of the pixels P corresponding to the scanning line  62  selected by the scanning line drive circuits  42  switches to an ON state. Thus, the grayscale potential is supplied to the gate of the drive transistor TDR of each of the pixels P, via the signal line  61  and the selection transistor TSL, and the voltage according to the grayscale potential is held in the capacitative element C. Meanwhile, when the selection of the scanning lines  62  in the write period ends, each of the scanning line drive circuits  42  supplies a control signal to each of the control lines  64 , thus controlling the light emission control transistor TEL of each of the pixels P corresponding to the control lines  64  to be in an ON state. Thus, a drive current that accords with the voltage held in the capacitative element C in the immediately preceding write period is supplied to the first light-emitting element  15  from the drive transistor TDR via the light emission control transistor TEL. In this way, the first light-emitting element  15  emits light at a luminance that accords with the grayscale potential. As a result, the desired first image light LR specified by the image signal is emitted from the first display region  111 . 
     Cross-Sectional Configuration of First Panel  10   
       FIG. 8  is a cross-sectional view of the first panel  10  illustrated in  FIG. 1 . As illustrated in  FIG. 8 , a transistor active region  40  (a source/drain region) for the selection transistor TSL of the pixel P and the like, is formed on the first substrate  11 , and the upper surface of the active region  40  is covered by an insulating film BO (a gate insulating film). A gate electrode G is formed on the upper surface of the insulating film BO. A multilayer wiring layer, in which a plurality of insulating layers BA to BE and a plurality of wiring layers WA to WE are alternately laminated, is formed on the upper layer side of the gate electrode G. Each of the wiring layers is formed of a low-resistance conductive material that contains aluminum, silver, or the like. The wiring layer WA that includes the scanning lines  62  and the like illustrated in  FIG. 7  is formed on the upper surface of the insulating film BA. The wiring layer WB that includes the signal lines  61 , the first electrodes C 1  and the like illustrated in  FIG. 7  is formed on the upper layer of the insulating layer BB. The wiring layer WC that includes the second electrodes C 2  and the like illustrated in  FIG. 7  is formed on the surface layer of the insulating layer BC. The wiring layer WD that includes the first power supply conductors  48  and the like illustrated in  FIG. 7  is formed on the surface layer of the insulating layer BD. The wiring layer WE that includes wiring  69 , wiring  67  and the like is formed on the upper layer of the insulating layer BE. 
     An optical path adjusting layer  60  is formed on the upper layer of the insulating layer BE. The optical path adjusting layer  60  is an element used to set a resonance wavelength of an optical resonator to an appropriate wavelength, and is formed of a light-transmissive insulating material of silicon nitride, silicon oxide or the like. Specifically, by appropriately adjusting an optical path length dR (an optical distance) between the first power supply conductor  48  and the second electrode E 2  that configure the optical resonator, in accordance with a film thickness of the optical path adjusting layer  60 , the resonance wavelength is set with respect to the light emitted from the first panel  10 . In the exemplary embodiment, since the red first image light LR is emitted from the first panel  10 , the optical path length of the optical resonator is set to a value appropriate for the first image light LR. 
     The first electrode E 1  is formed on the upper surface of the optical path adjusting layer  60 , for each of the pixels P in the first display region  111 . The first electrode E 1  is formed of a light-transmissive conductive material, such as indium tin oxide (ITO), for example. An insulating pixel defining layer  65  is formed around the first electrode E 1 . The light-emitting functional layer  46  is formed on the upper surface of the first electrode E 1 . The light-emitting functional layer  46  is configured to contain the light-emitting layer formed by the organic EL material, and irradiates white light as a result of the supply of current. A transport layer or an injection layer of electrons or positive holes supplied to the light-emitting layer is sometimes provided in the light-emitting functional layer  46 . The light-emitting functional layer  46  is formed continuously over the plurality of pixels P in the first display region  111 . 
     The second electrode E 2  is formed on the upper layer of the light-emitting functional layer  46 , over the entire area of the first display region  111 , and, of the light-emitting functional layer  46 , a region (a light-emitting region) sandwiched by the first electrode E 1  and the second electrode E 2  emits light. The second electrode E 2  allows some of the light that has reached it to pass through, and also functions as a semitransparent reflection layer that reflects back the rest of the light. For example, by forming a photoreflective conductive material, such as an alloy or the like containing silver or magnesium, of a sufficiently thin film thickness, the semitransparent reflective electrode E 2  is formed. The radiated light from the light-emitting functional layer  46  reciprocates between the first power supply conductor  48  and the second electrode E 2 , and components of a particular resonance wavelength are selectively amplified. Then, the reciprocating light passes through the second electrode E 2  and is emitted to an observation side (the opposite side to the first substrate  11 ). In other words, an optical resonator is formed that causes the light emitted from the light-emitting functional layer  46  to resonate between the first power supply conductor  48  that functions as the reflection layer and the second electrode E 2  that functions as the semitransparent reflection layer. 
     Here, in the peripheral region  112 , the wiring  66 ,  67 ,  68 ,  69 , and the like are formed in the same layers as the conductive layers formed in the first display region  111 , and the wiring  66 ,  67 ,  68 , and  69  are electrically connected via contact holes of the insulating layers formed between the wiring, for example. 
     A sealing body  70  is formed on the upper layer side of the second electrode E 2 , over the entire area of the first substrate  11 . The sealing body  70  is a light-transmissive film body that seals each of the structural elements formed on the first substrate  11  and prevents the infiltration of outside air and moisture, and is configured by a laminated film of a first sealing layer  71 , a second sealing layer  72 , and a third sealing layer  73 , for example. The third sealing layer  73  is formed on the upper layer of the second electrode E 2  and is in direct contact with the upper surface of the second electrode E 2 . The third sealing layer  73  is an insulating inorganic material such as a silicon compound (typically, silicon nitride or silicon oxide), for example. The first sealing layer  71  functions as a flattening film that buries level differences of the surface of the second electrode E 2  and the third sealing layer  73 . The first sealing layer  71  is formed of a light-transmissive organic materials, such as an epoxy resin, for example. The second sealing layer  72  is formed over the entire area of the first substrate  11 . The second sealing layer  72  is formed of a silicon nitride compound, a silicon oxide compound, or the like, for example, which offer excellent water-resistant and heat-resistant properties. 
     The first coloring layer  81 (R) is formed on the upper surface of the sealing body  70  (the second sealing layer  72 ). The first coloring layer  81 (R) allows the red light of the first wavelength range to pass through. Further, in the first panel  10 , a transmissive cover substrate  18  is fixed to the first coloring layer  81 (R), on the opposite side to the first substrate  11 , by an adhesive  17 . 
     Configuration of Second Panel  20  and Third Panel  30   
       FIG. 9  is a cross-sectional view of the second panel  20  illustrated in  FIG. 1 .  FIG. 10  is a cross-sectional view of the third panel  30  illustrated in  FIG. 1 . Similar to the first panel  10 , the second panel  20  and the third panel  30  illustrated in  FIG. 1  have the electrical configuration explained with reference to  FIG. 6  and  FIG. 7 , and the second light-emitting elements  25  and the third light-emitting elements  35  are formed in place of the first light-emitting elements  15 . 
     As illustrated in  FIG. 9 , in the second panel  20 , in place of the first coloring layer  81 (R) explained with reference to  FIG. 8 , the second coloring layer  81 (B) is formed, and the second coloring layer  81 (B) allows the blue light of the second wavelength range to pass through. Further, the film thickness of the optical path adjusting layer  60  illustrated in  FIG. 9  is adjusted to correspond to the wavelength of the blue second image light LB emitted from the second panel  20 , and an optical path length dB (the optical distance) between the first power supply conductor  48  and the second electrode E 2  that configure the optical resonator is optimized. Further, in the second panel  20 , a transmissive cover substrate  28  is fixed to the second coloring layer  81 (B), on the opposite side to the second substrate  21 , by an adhesive  27 . 
     As illustrated in  FIG. 10 , in the third panel  30 , in place of the first coloring layer  81 (R) explained with reference to  FIG. 8 , the third coloring layer  81 (G) is formed, and the third coloring layer  81 (G) allows the green light of the third wavelength range to pass through. Further, the film thickness of the optical path adjusting layer  60  illustrated in  FIG. 10  is adjusted to correspond to the wavelength of the green third image light LG emitted from the third panel  30 , and an optical path length dG (the optical distance) between the first power supply conductor  48  and the second electrode E 2  that configure the optical resonator is optimized. Further, in the third panel  30 , a transmissive cover substrate  38  is fixed to the third coloring layer  81 (G), on the opposite side to the third substrate  31 , by an adhesive  37 . 
     Configuration of Light Shielding Layer  80   
       FIG. 11  is an explanatory diagram illustrating effects of a light shielding layer  80  illustrated in  FIG. 1  and the like. Returning once again to  FIG. 1 , the optical unit  1  of the exemplary embodiment uses the light (the first image light LR, the second image light LB, and the third image light LG) emitted from the light-emitting elements (the first light-emitting elements  15 , the second light-emitting elements  25 , and the third light-emitting elements  35 ), such as the organic electroluminescent elements and the like. Thus, the first image light LR, the second image light LB, and the third image light LG include the oblique light that is significantly inclined with respect to the device optical axis. Meanwhile, in the dichroic prism  50 , in the dichroic mirrors (the first dichroic mirror  56 , and the second dichroic mirror  57 ), due to the influence of the incident angle dependence and the like, some of the color light that should be reflected passes through the dichroic mirrors, and some of the color light that should be allowed to pass through is reflected by the dichroic mirrors. 
     Here, in the optical unit  1  of the exemplary embodiment, in any one of the first substrate  11 , the second substrate  21 , and the third substrate  31 , the light shielding layer  80  is provided between the dichroic prism  50  and the peripheral region surrounding the display region, and the light shielding layer  80  absorbs the light of the first wavelength range, the light of the second wavelength range, and the light of the third wavelength range. Further, in the optical unit  1  of the exemplary embodiment, of the first substrate  11 , the second substrate  21 , and the third substrate  31 , the light shielding layer  80  is also provided between the dichroic prism  50  and the peripheral region surrounding the display region in another of the substrates that is different from the one substrate described above. Furthermore, in the optical unit  1  of the exemplary embodiment, of the first substrate  11 , the second substrate  21 , and the third substrate  31 , the light shielding layer  80  is also provided between the dichroic prism  50  and the peripheral region surrounding the display region in the remaining substrate that is different from the one substrate and the other substrate described above. 
     Specifically, in the exemplary embodiment, of the first substrate  11 , the second substrate  21 , and the third substrate  31 , the light shielding layer  80  is provided between the dichroic prism  50  and each of the peripheral regions  112 ,  212 , and  312  of all the substrates. Further, the light shielding layer  80  is provided between the dichroic prism  50  and metal wiring  16 ,  26 , and  36 , of the wiring  66 ,  67 ,  68 , and  69  provided in the peripheral regions  112 ,  212 , and  312  of the first substrate  11 , the second substrate  21 , and the third substrate  31 , positioned closest to the side of the dichroic prism  50 . 
     Thus, as illustrated in  FIG. 11 , in the dichroic prism  50 , even when part of the color light that should be reflected has passed through the dichroic mirrors (the first dichroic mirror  56  and the second dichroic mirror  57 ), or when part of the color light that should be allowed to pass through is reflected by the dichroic mirrors (the first dichroic mirror  56  and the second dichroic mirror  57 ), this leaked light is blocked by the light shielding layer  80 . Therefore, it is possible to suppress the leaked light from being reflected by the metal wiring  16 ,  26 , and  36  and the like of the peripheral regions  112 ,  212 , and  312  of the substrates (the first substrate  11 , the second substrate  21 , and the third substrate  31 ). As a result, the occurrence of stray light caused by the light reflected by the peripheral regions  112 ,  212 , and  312  of the substrates (the first substrate  11 , the second substrate  21 , and the third substrate  31 ) can be suppressed. 
     For example, after part of the second image light LB emitted from the second panel  20  is not reflected by the second dichroic mirror  57  and passes through, even if the light passes through the first dichroic mirror  56  and advances obliquely toward the peripheral region  112  of the first panel  10 , the leaked light is absorbed by the light shielding layer  80 . Thus, it is possible to suppress the leaked light from being reflected by the metal wiring  16  formed in the peripheral region  112  of the first substrate  11  of the first panel  10 , and becoming the stray light. Further, after part of the third image light LG emitted from the third panel  30  does not pass through the second dichroic mirror  57  and is reflected, even if the light advances obliquely toward the peripheral region  312  of the third panel  30 , the leaked light is absorbed by the light shielding layer  80 . Thus, it is possible to suppress the leaked light from being reflected by the metal wiring  36  formed in the peripheral region  312  of the third substrate  31  of the third panel  30 , and becoming the stray light. As a result, in the display device to be described later, it is possible to suppress the leaked light from being visually recognized along with the image light. 
     Configuration Example of Light Shielding Layer  80   
       FIG. 10  is an explanatory diagram illustrating transmittance-wavelength characteristics of the light shielding layer  80  illustrated in  FIG. 8  and the like. When configuring the light shielding layer  80  illustrated in  FIG. 1 , in the exemplary embodiment, the light shielding layer  80  is provided between the first substrate  11  and the cover substrate  18 , between the second substrate  21  and the cover substrate  28 , and between in the third substrate  31  and the cover substrate  38 , in regions overlapping with the peripheral region  112 , the peripheral region  212 , and the peripheral region  312 . For example, the light shielding layer  80  is provided on each of the peripheral region  112  of the first substrate  11 , the peripheral region  212  of the second substrate  21 , and the peripheral region  312  of the third substrate  31 . Here, the light shielding layer  80  can be configured by a black filter layer containing black particles, such as carbon particles or the like, a light-absorbent metal layer, a light-absorbent metal compound layer or the like. 
     Further, the light shielding layer  80  may be configured by providing the first coloring layer  81 (R), the second coloring layer  81 (B), and the third coloring layer  81 (G) explained with reference to  FIG. 8 ,  FIG. 9 , and  FIG. 10  so as to overlap with each other. 
     More specifically, as illustrated in  FIG. 8 , when providing the light shielding layer  80  on the peripheral region  112  of the first substrate  11 , a first color filter layer  82 (R) that is formed of the same material as the first coloring layer  81 (R), a second color filter layer  82 (B) that is formed of the same material as the second coloring layer  81 (B) illustrated in  FIG. 9 , and a third color filter layer  82 (G) that is formed of the same material as the third coloring layer  81 (G) illustrated in  FIG. 10  are laminated on the peripheral region  112 . 
     Here, the transmittance-wavelength characteristics of the first coloring layer  81 (R) and the first color filter layer  82 (R) have the transmittance-wavelength characteristics indicated by the dashed line P 81 (R) illustrated in  FIG. 2 . The second coloring layer  81 (B) and the second color filter layer  82 (B) have the transmittance-wavelength characteristics indicated by the one-dot chain line P 81 (B) in  FIG. 2 . The third coloring layer  81 (G) and the third color filter layer  82 (G) have the transmittance-wavelength characteristics indicated by the two-dot chain line P 81 (G) in  FIG. 2 . Thus, by laminating the first color filter layer  82 (R), the second color filter layer  82 (B), and the third color filter layer  82 (G), the light shielding layer  80  can be obtained having the transmittance-wavelength characteristics indicated by a solid line P 80  in  FIG. 2 . As a result, the light shielding layer  80 , the light of the first wavelength range, the light of the second wavelength range, and the light of the third wavelength range can be appropriately absorbed. 
     Here, while the first color filter layer  82 (R) is formed continuously from the first coloring layer  81 (R) of the first display region  111  to the peripheral region  112 , the second color filter layer  82 (B) and the third color filter layer  82 (G) are formed only in the peripheral region  112 , and are not formed in the first display region  111 . In the exemplary embodiment, the second color filter layer  82 (B) and the third color filter layer  82 (G) are formed between the first substrate  11  and the first color filter layer  82 (R). Thus, the second color filter layer  82 (B) and the third color filter layer  82 (G) are sequentially formed in a predetermined pattern, and after that, the first color filter layer  82 (R) is formed. As a result, after forming the first color filter layer  82 (R), it is not necessary to perform a process for the patterning of the second color filter layer  82 (B) and the third color filter layer  82 (G), and thus, a situation does not occur in which the first color filter layer  82 (R) is damaged by the patterning. 
     Further, as illustrated in  FIG. 9 , when providing the light shielding layer  80  on the peripheral region  212  of the second substrate  21 , similarly to the peripheral region  112  of the first substrate  11 , the first color filter layer  82 (R) that is formed of the same material as the first coloring layer  81 (R), the second color filter layer  82 (B) that is formed of the same material as the second coloring layer  81 (B), and the third color filter layer  82 (G) that is formed of the same material as the third coloring layer  81 (G) are laminated on the peripheral region  212 . 
     Here, while the second color filter layer  82 (B) is formed continuously from the second coloring layer  81 (B) of the second display region  211  to the peripheral region  212 , the first color filter layer  82 (R) and the third color filter layer  82 (G) are formed only in the peripheral region  212 , and are not formed in the second display region  211 . In the exemplary embodiment, the first color filter layer  82 (R) and the third color filter layer  82 (G) are formed between the second substrate  21  and the second color filter layer  82 (B). As a result, after forming the second color filter layer  82 (B), it is not necessary to perform a process for the patterning of the first color filter layer  82 (R) and the third color filter layer  82 (G), and thus, a situation does not occur in which the second color filter layer  82 (B) is damaged by the patterning. 
     Also, as illustrated in  FIG. 10 , when providing the light shielding layer  80  on the peripheral region  312  of the third substrate  31 , similarly to the light shielding layer  80  on the peripheral region  112  of the first substrate  11 , the first color filter layer  82 (R) that is formed of the same material as the first coloring layer  81 (R), the second color filter layer  82 (B) that is formed of the same material as the second coloring layer  81 (B), and the third color filter layer  82 (G) that is formed of the same material as the third coloring layer  81 (G) are laminated on the peripheral region  312 . 
     Here, while the third color filter layer  82 (G) is formed continuously from the third coloring layer  81 (G) of the third display region  311  to the peripheral region  312 , the first color filter layer  82 (R) and the second color filter layer  82 (B) are formed only in the peripheral region  312 , and are not formed in the third display region  311 . In the exemplary embodiment, the first color filter layer  82 (R) and the second color filter layer  82 (B) are formed between the third substrate  31  and the third color filter layer  82 (G). As a result, after forming the third color filter layer  82 (G), it is not necessary to perform a process for the patterning of the first color filter layer  82 (R) and the second color filter layer  82 (B), and thus, a situation does not occur in which the third color filter layer  82 (G) is damaged by the patterning. 
     Second Exemplary Embodiment 
       FIG. 12  is a plan view of the optical unit  1  according to a second exemplary embodiment of the invention.  FIG. 13  is an explanatory diagram of the light shielding layer  80  provided between the first panel  10  and the dichroic prism  50  illustrated in  FIG. 12 . Note that basic configurations in this exemplary embodiment are the same as in the first exemplary embodiment, and thus, common portions are denoted by the same reference signs and the description of the common portions will be omitted. 
     In the first exemplary embodiment, the light shielding layer  80  is provided on each of the peripheral regions  112 ,  212 , and  312  of the first substrate  11 , the second substrate  21 , and the third substrate  31  by laminating the first color filter layer  82 (R), the second color filter layer  82 (B), and the third color filter layer  82 (G). 
     In contrast to this, in this exemplary embodiment, as illustrated in  FIG. 12  and  FIG. 13 , of the first color filter layer  82 (R), the second color filter layer  82 (B), and the third color filter layer  82 (G), only the first color filter layer  82 (R) is provided in the peripheral region  112  of the first substrate  11 . However, on the cover substrate  18 , the second color filter layer  82 (B) and the third color filter layer  82 (G) are laminated in a region facing the peripheral region  112 . Thus, the light shielding layer  80  can be configured by the first color filter layer  82 (R), the second color filter layer  82 (B), and the third color filter layer  82 (G). 
     Further, although not illustrated in detail, using the same configuration, the light shielding layer  80  is provided between the dichroic prism  50  and each of the peripheral regions  212  and  312  of the second substrate  21  and the third substrate  31 . Specifically, as illustrated in  FIG. 12 , while the second color filter layer  82 (B) is provided in the peripheral region  212  of the second substrate  21 , on the cover substrate  28 , the first color filter layer  82 (R) and the third color filter layer  82 (G) are laminated in a region facing the peripheral region  212 . Further, as illustrated in  FIG. 12 , while the third color filter layer  82 (G) is provided in the peripheral region  312  of the third substrate  31 , on the cover substrate  38 , the first color filter layer  82 (R) and the second color filter layer  82 (B) are laminated in a region facing the peripheral region  312 . 
     Modified Example of Second Exemplary Embodiment 
     In the above-described second exemplary embodiment, the second color filter layer  82 (B) and the third color filter layer  82 (G) are provided on a surface of the cover substrate  18  on the first substrate  11  side, but the second color filter layer  82 (B) and the third color filter layer  82 (G) may be provided on the surface of the cover substrate  18  on the opposite side to the first substrate  11  (the surface on the side of the first incident surface  51  of the dichroic prism  50 ), or on the first incident surface  51  of the dichroic prism  50 . 
     Further, in the above-described second exemplary embodiment, the first color filter layer  82 (R) and the third color filter layer  82 (G) are provided on a surface of the cover substrate  28  on the second substrate  21  side, but the first color filter layer  82 (R) and the third color filter layer  82 (G) may be provided on the surface of the cover substrate  28  on the opposite side to the second substrate  21  (the surface on the side of the second incident surface  52  of the dichroic prism  50 ), or on the second incident surface  52  of the dichroic prism  50 . 
     Further, in the above-described second exemplary embodiment, the first color filter layer  82 (R) and the second color filter layer  82 (B) are provided on a surface of the cover substrate  38  on the third substrate  31  side, but the first color filter layer  82 (R) and the second color filter layer  82 (B) may be provided on the surface of the cover substrate  38  on the opposite side to the third substrate  31  (the surface on the side of the third incident surface  53  of the dichroic prism  50 ), or on the third incident surface  53  of the dichroic prism  50 . 
     Third Exemplary Embodiment 
       FIG. 14  is a plan view of the optical unit  1  according to a third exemplary embodiment of the invention. Note that basic configurations in this exemplary embodiment are the same as in the first exemplary embodiment, and thus, common portions are denoted by the same reference signs and the description of the common portions will be omitted. 
     As illustrated in  FIG. 14 , also in the optical unit  1  of this exemplary embodiment, similar to the first exemplary embodiment, the light shielding layer  80  is provided between the dichroic prism  50  and each of the peripheral regions  112 ,  212 , and  312  of the first substrate  11 , the second substrate  12 , and the third substrate  31 . When providing the light shielding layer  80 , in this exemplary embodiment, the light shielding layer  80  is provided between the cover substrate  18  and the dichroic prism  50 , between the cover substrate  28  and the dichroic prism  50 , and between the cover substrate  38  and the dichroic prism  50 , in regions overlapping with the peripheral region  112 , the peripheral region  212 , and the peripheral region  312 . For example, the light shielding layer  80  is provided on the first incident surface  51 , the second incident surface  52 , and the third incident surface  53  of the dichroic prism  50 , in regions facing the peripheral regions  112 ,  212 , and  312  of the first substrate  11 , the second substrate  21 , and the third substrate  31 . 
     In this case, the light shielding layer  80  may be configured by the laminated layer of the first color filter layer  82 (R), the second color filter layer  82 (B), and the third color filter layer  82 (G), a black filter layer containing black particles, such as carbon particles or the like, a light-absorbent metal layer, a light-absorbent metal compound layer or the like. 
     Modified Example of Third Exemplary Embodiment 
     In the above-described third exemplary embodiment, the light shielding layer  80  is provided on the first incident surface  51 , the second incident surface  52 , and the third incident surface  53  of the dichroic prism  50 , but the light shielding layer  80  may be provided on the surfaces of the cover substrates  18 ,  28  and  38  on the dichroic prism  50  side. 
     Forming Range of Light Shielding Layer  80   
       FIG. 15  is an explanatory diagram illustrating a first example of a forming range of the light shielding layer  80  in the optical unit  1  to which the invention is applied.  FIG. 16  is an explanatory diagram illustrating a second example of the forming range of the light shielding layer  80  in the optical unit  1  to which the invention is applied. As in the second exemplary embodiment or the third exemplary embodiment, when the light shielding layer  80  is provided in a position separated from the panel to the side of the dichroic prism  50 , when a part of the image light emitted from the panel is blocked by the light shielding layer  80 , a decrease in an amount of light, or image loss occurs. 
     Thus, as illustrated in  FIG. 15 , and as explained taking the third image light LG emitted from the third panel  30  as an example, of a luminous flux of the third image light LG emitted toward the dichroic prism  50  from the third display region  311  of the third substrate  31 , the light shielding layer  80  is preferably provided in a position separated from an effective luminous flux LO corresponding to a luminous flux emitted from the emission surface  54 . 
     For example, when an angle between a ray of light positioned at the end of the effective luminous flux LO and a normal line with respect to the third incident surface  53  is θ, a distance in the direction of the normal line with respect to the third incident surface  53  from the third light-emitting element  35  to the surface of the light shielding layer  80  on the dichroic prism  50  side is d, and an interval between an edge of the light shielding layer  80 , when seen from the direction of the normal line with respect to the third incident surface  53 , and the third light-emitting element  35  positioned on an end portion of the third display region  311  is Ga, the angle θ, the distance d, and the interval Ga preferably satisfy the following condition. 
         Ga&gt;d *tan θ
 
     Further, as illustrated in  FIG. 16 , when a part of the luminous flux emitted from the emission surface  54  is the effective luminous flux LO that is used in the display of the image, the light shielding layer  80  is preferably provided in a position separated from the effective luminous flux LO. In this case also, the angle θ between the ray of light positioned at the end of the effective luminous flux LO and the normal line with respect to the third incident surface  53 , the distance d in the direction of the normal line with respect to the third incident surface  53  from the third light-emitting element  35  to the surface of the light shielding layer  80  on the dichroic prism  50  side, and the interval Ga between the edge of the light shielding layer  80 , when seen from the direction of the normal line with respect to the third incident surface  53 , and the third light-emitting element  35  positioned on the end portion of the third display region  311  preferably satisfy the following condition. 
         Ga&gt;d *tan θ
 
     OTHER EXEMPLARY EMBODIMENTS 
     In the above-described exemplary embodiments, in the first panel  10 , the second panel  20 , and the third panel  30 , the white light emitted from the light-emitting elements is caused to be the image light of each wavelength range as a result of the coloring layers, but since the optical resonator is provided in the first panel  10 , the second panel  20 , and the third panel  30 , the invention may also be applied to a case in which the layers are not provided. Further, the invention may be applied to a case in which, in the first panel  10 , the second panel  20 , and the third panel  30 , the light-emitting elements themselves emit the image light of each of the wavelength ranges. Further, when, in the first panel  10 , the second panel  20 , and the third panel  30 , the light-emitting elements themselves emit the image light of each of the wavelength ranges, although there are cases in which one of the coloring layers or the optical resonator, or both the coloring layers and the optical resonator are not provided, the invention may also be applied to this type of case. In the above-described exemplary embodiments, the cover substrates  18 ,  28 , and  38  are provided on the first panel  10 , the second panel  20 , and the third panel  30 , but the invention may be applied to a case in which the cover substrates are not provided. 
     In the above-described exemplary embodiments, the light shielding layer  80  is provided on all of the first panel  10 , the second panel  20 , and the third panel  30 , but the light shielding layer  80  may be provided on one or some of the first panel  10 , the second panel  20 , and the third panel  30 . 
     In all of the above-described exemplary embodiments, a case is exemplified in which each of the plurality of pixels has the organic electroluminescent element as the light-emitting element, but the invention may be applied to a case in which a light-emitting diode or the like is provided as the light-emitting element. 
     Configuration Example 1 of Display Device 
     The optical unit  1  described in the above-described exemplary embodiments is used in a display device or the like described below.  FIG. 17  is an explanatory diagram of a head-mounted display device  1000 .  FIG. 18  is a perspective view schematically illustrating a configuration of an optical system of virtual display units  1010  illustrated in  FIG. 17 .  FIG. 19  is an explanatory diagram illustrating optical paths of the optical system illustrated in  FIG. 18 . 
     A display device  1000  illustrated in  FIG. 17  is configured as a see-through eyeglass display, and includes a frame  1110  provided with left and right temples  1111  and  1112 . In the display device  1000 , the virtual display units  1010  are supported by the frame  1110 , and an image emitted from the virtual display units  1010  is caused to be recognized as a virtual image by a user. In this exemplary embodiment, the display device  1000  is provided with a left-eye display unit  1101  and a right-eye display unit  1102  as the virtual display units  1010 . The left-eye display unit  1101  and the right-eye display unit  1102  are disposed left-right symmetrically with the identical configuration. 
     Therefore, the left-eye display unit  1101  will be mainly described below, and the description of the right-eye display unit  1102  will be omitted. As illustrated in  FIG. 18 , in the display device  1000 , the display unit  1101  includes the optical unit  1 , and a light guide system  1030  that guides synthesized light Lb emitted from the optical unit  1  to an emission unit  1058 . A projection lens system  1070  is disposed between the optical unit  1  and the light guide system  1030 , and the synthesized light Lb emitted from the optical unit  1  enters the light guide system  1030  via the projection lens system  1070 . The projection lens system  1070  is configured by a single collimate lens that has a positive power. 
     The light guide system  1030  is configured by a transmissive incident unit  1040  on which the synthesized light Lb is incident, and a transmissive light guide unit  1050 , a one end  1051  side of which is connected to the incident unit  1040 . In the embodiment, the incident unit  1040  and the light guide unit  1050  are configured as an integrated transmissive member. 
     The incident unit  1040  is provided with an incident surface  1041  on which the synthesized light Lb emitted from the optical unit  1  is incident, and a reflection surface  1042  that reflects the synthesized light Lb that has entered from the incident surface  1041  between the reflection surface  1042  and the incident surface  1041 . The incident surface  1041  is a flat surface, an aspherical surface, a free form surface, or the like, and faces the optical unit  1  via the projection lens system  1070 . The projection lens system  1070  is disposed obliquely such that an interval between the projection lens system  1070  and an end portion  1412  of the incident surface  1041  is larger than an interval between the projection lens system  1070  and an end portion  1411  of the incident surface  1041 . A reflection film or the like is not formed on the incident surface  1041 , but the incident surface  1041  fully reflects light that is incident at an incident angle equal to or greater than a critical angle. Thus, the incident surface  1041  has transmittance and reflectivity. The reflection surface  1042  is a surface facing the incident surface  1041  and is disposed obliquely such that an end portion  1422  of the reflection surface  1042  is separated farther from the incident surface  1041  than from an end portion  1421  of the incident surface  1041 . Thus, the incident unit  1040  has a substantially triangular shape. The incident surface  1042  is a flat surface, an aspherical surface, a free form surface, or the like. The reflection surface  1042  can adopt a configuration in which a reflective metal layer mainly formed of aluminum, silver, magnesium, chrome or the like is formed. 
     The light guide unit  1050  is provided with a first surface  1056  (a first reflection surface) that extends from a one end  1051  to another end  1052  side, a second surface  1057  (a second reflection surface) that extends in parallel to the first surface  1056  from the one end  1051  side to the other end  1052  side, and an emission portion  1058  provided on a section of the second surface  1057  that is separated from the incident unit  1040 . The first surface  1056  and the reflection surface  1042  of the incident unit  1040  are joined together by an inclined surface  1043 . A thickness of the first surface  1056  and the second surface  1057  is thinner than the incident unit  1040 . The first surface  1056  and the second surface  1057  reflect all of the light that is incident at an incident angle equal to or greater than the critical angle, on the basis of a refractive index difference between the light guide unit  1050  and the outside (the air). Thus, a reflection film and the like is not formed on the first surface  1056  and the second surface  1057 . 
     The emission unit  1058  is configured on a part of the light guide unit  1050  on the side of the second surface  1057  in the thickness direction of the light guide unit  1050 . In the emission unit  1058 , a plurality of partial reflection surfaces  1055  that are inclined obliquely with respect to a normal line with respect to the second surface  1057  are arranged so as to be mutually parallel to each other. The emission unit  1058  is a portion that overlaps with the plurality of partial reflection surfaces  1055 , of the second surface  1057 , and is a region having a predetermined width in an extending direction of the light guide unit  1050 . Each of the plurality of partial reflection surfaces  1055  is formed by a dielectric multilayer film. Further, at least one of the plurality of partial reflection surfaces  1055  may be a composite layer of a dielectric multilayer film with a reflective metal layer (thin film) mainly formed of aluminum, silver, magnesium, chrome, or the like. When the partial reflection surface  1055  is configured to include the metal layer, an effect can be obtained to improve the reflectance of the partial reflection surface  1055 , or an effect that the incident angle dependence or the polarization dependence of the transmittance and the reflectance of the partial reflection surface  1055  can be optimized. Note that the emission unit  1058  may have a configuration in which an optical element, such as a diffraction grating, a hologram, or the like is provided. 
     In the display device  1000  configured in this manner, the synthesized light Lb formed of the parallel light incident from the incident unit  1040 , is refracted by the incident surface  1041  and is oriented toward the reflection surface  1042 . Next, the synthesized light Lb is reflected by the reflection surface  1042 , and is once again oriented toward the incident surface  1041 . At this time, since the synthesized light Lb is incident on the incident surface  1041  at the incident angle equal to or greater than the critical angle, the synthesized light Lb is reflected by the incident surface  1041  toward the light guide unit  1050 , and is oriented toward the light guide unit  1050 . Note that, in the incident unit  1040 , the configuration is used in which the synthesized light Lb that is the parallel light is incident on the incident surface  1041 , but a configuration may be adopted in which the incident surface  1041  and the reflection surface  1042  are configured by a free form curve or the like, and after the synthesized light Lb that is formed of the non-parallel light is incident on the incident surface  1041 , the synthesized light Lb is reflected between the reflection surface  1042  and the incident surface  1041  and is converted to the parallel light while being reflected. 
     In the light guide unit  1050 , the synthesized light Lb is reflected between the first surface  1056  and the second surface  1057 , and advances. Then, a part of the synthesized light Lb that is incident on the partial reflection surface  1055  is reflected by the partial reflection surface  1055  and is emitted from the emission unit  1058  toward an eye E of an observer. Further, the rest of the synthesized light Lb incident on the partial reflection surface  1055  passes through the partial reflection surface  1055  and is incident to the next, adjacent, partial reflection surface  1055 . As a result, the synthesized light Lb that is reflected by each of the plurality of partial reflection surfaces  1055  is emitted from the emission unit  1058  toward the eye E of the observer. Therefore, the observer can recognize a virtual image. At this time, of the light from the outside, the light that has entered the light guide unit  1050  from the outside passes through the partial reflection surfaces  1055  after entering the light guide unit  1050 , and reaches the eye E of the observer. As a result, the observer can see the color image emitted from the optical unit  1  and can also see the outside background and the like in a see through manner. 
     Configuration Example 2 of Display Device 
       FIG. 20  is an explanatory diagram of a projection-type display device  2000 . The display device  2000  illustrated in  FIG. 20  includes the optical unit  1  according to the above-described exemplary embodiments, and a projection optical system  2100  that expands and projects the synthesized light Lb emitted from the optical unit  1  onto a projection receiving member  2200 , such as a screen or the like. 
     Other Configuration Examples of Display Device 
     The display device (electronic apparatus) provided with the optical unit  1  described in the above-described exemplary embodiments can be an electronic view finder (EVF) or the like used in an imaging device, such as a video camera and a still camera. 
     The entire disclosure of Japanese Patent Application No. 2018-059468, filed Mar. 27, 2018 is expressly incorporated by reference herein.