JP2013114022A - Polarizing device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize light from display elements to the maximum, cause external light to be attenuated to some extent and thereby increase the contrast of displayed images while using the see-through system.SOLUTION: A polarizing device comprises a first lens 221 formed of a refractive material whose refractive index at a first polarization azimuth angle is a first refractive index n1 and a second lens 222 formed of a refractive material whose refractive index at the first polarization azimuth angle is a first refractive index ne (=n1) and whose refractive index at a second polarization azimuth angle is a second refractive index no different from the first refractive index ne. The first lens 221 and the second lens 222 are so joined that their refraction indices at their respective first polarization azimuth angles are identical to each other, and the refraction indices of the refractive materials coming into contact with each other at the second polarization azimuth angle are different.

Description

  The present invention relates to a polarizing device in which each refractive material has a different refractive index, and a display device including the polarizing device.

  Conventionally, a head-mounted display device called a head mounted display (HMD) has been developed. In this head-mounted display device, an optical image is formed on a display such as a liquid crystal panel or an organic EL panel installed in front of the observer's eyes, and the optical image is passed through an optical system having an eyepiece, a half mirror, or the like. The image is displayed by enlarging and forming an image on the eyes of the observer. As this HMD, there is also a so-called see-through type HMD in which a virtual image of an image displayed on a display element can be seen superimposed on the outside.

  Here, in general, in the HMD, a lens surface having a refractive power is arranged in front of the eye so that an observer forms a virtual image. Therefore, the see-through type HDM having such a configuration allows the outside world to be viewed through the lens surface. There is a problem that the outside world is distorted due to light refraction by the lens surface. In order to correct such distortion of the external environment due to the lens surface, there is a technique of arranging a compensation lens element for canceling refraction by the lens surface (for example, Patent Documents 1 and 2).

JP 2005-17775 A JP 2001-311903 A

  However, in the technology disclosed in Patent Document 1, since light from the outside (hereinafter referred to as external light) enters the eye without attenuation, in order to improve the visibility of the virtual image of the display element, There is a problem that it is necessary to increase the luminance (contrast) of the display element, and the power required for display cannot be reduced.

  Further, in the technique disclosed in Patent Document 2, since the half mirror is formed on the lens surface for generating the virtual image, the light from the display element is also attenuated, and the brightness of the virtual image is lowered. There is a point.

  Therefore, in consideration of the above-described circumstances, the present invention provides a polarizing device that can maximize the light from a display element, attenuate external light to some extent, and increase the contrast of a display image while being a see-through method. It is an object to provide a display device.

  In order to solve the above-described problem, a polarizing device according to the present invention includes a first lens formed of a refractive material having a refractive index at the first polarization azimuth angle as a first refractive index, and a first polarization azimuth. The refractive index at the corner becomes the first refractive index, and the refractive index at the second polarization azimuth angle different from the first polarization azimuth angle becomes the second refractive index different from the first refractive index. A second lens made of a refractive material, and the first and second lenses are joined so that the first polarization azimuth angles thereof coincide with each other, and the second polarization azimuth The refractive indexes of the refractive materials that are in contact with each other at the corners are different.

  Here, as the first lens, the refractive index at the first polarization azimuth is the first refractive index, and the refractive index at the other polarization azimuth is the second polarization azimuth in the second lens. It is only necessary to use a refractive material different from the refractive index of the corner, and an isotropic refractive material having the same refractive index at all the polarization azimuth angles can be used. On the other hand, the second lens must be formed of refractive materials having different refractive indexes at at least two polarization azimuth angles, and a birefringent material such as calcite is used.

  According to such a polarizing device of the present invention, at the interface where the first lens and the second lens are joined, the first polarization azimuth angle that is matched with each other is the refraction that has the first refractive index. Since the materials are in contact with each other, the refractive index difference is small, and with respect to the second polarization azimuth angle, since refractive materials with different refractive indexes are in contact with each other, a refractive index difference is generated. As a result, when the combined light of the polarization component of the first polarization azimuth and the polarization component of the second polarization azimuth is incident, the polarization component of the first polarization azimuth is refracted. Without passing through the interface, the polarized light component having the second polarization azimuth angle is refracted and transmitted according to the refractive index difference.

  In the polarizing device described above, the first lens is a plano-concave lens in which an interface with the second lens is formed as a concave surface, and a surface facing the interface is formed into a flat surface, and the second lens is It is preferable that the interface is a plano-convex lens in which the interface is formed as a convex surface and the surface facing the interface is formed as a flat surface, and the curved surfaces of the concave surface and the convex surface are the same.

  In this case, a lens is formed at the interface between the first lens and the second lens. The first polarization component that vibrates at the first polarization azimuth has a lens effect because there is almost no difference in refractive index at the interface (curved surface) and both the light incident surface and the light exit surface are flat. Without passing through the interface. On the other hand, the second polarization component that vibrates at the second polarization azimuth angle has a refractive index difference at the interface (curved surface), and thus receives a convex lens action when passing through the interface.

  Moreover, the display device according to the present invention is a display device including any one of the above polarizing devices, and transmits only the first polarization component that vibrates at the first polarization azimuth angle in the incident light. A transmission polarization unit; a display unit that emits only the second polarization component that vibrates at the second polarization azimuth; the first polarization component emitted from the transmission polarization unit; and the display unit. An optical system that combines the second polarization component and makes it incident on the polarization device, and an optical system that presents an enlarged virtual image from the display unit in front of the viewer's eyes through the polarization device. It is characterized by providing.

  According to such a display device, the first polarization component emitted from the transmission polarization unit and the second polarization component radiated from the display unit are combined by the combining unit and incident on the polarization device. In the apparatus, the first polarization component is transmitted without being refracted, the second polarization component is refracted and imaged, and an enlarged virtual image of the image displayed on the display element is presented to be observable in front of the observer's eyes. be able to.

  As a result, when outside light from the outside world is incident on the transmission polarization section, a see-through display device that combines and presents the scenery of the outside world and the virtual image from the display section can be configured. In this case, the image displayed on the display unit is presented in front of the eyes as a virtual image magnified by the polarizing device functioning as an eyepiece, and the external light passes through the polarizing device as it is without being refracted, and the outside world is not distorted by the observer. Can be presented.

  At this time, since the transmission polarization part transmits only the first polarization component of the external light, the external light is attenuated when passing through the transmission polarization part, and the intensity of the external light can be weakened. However, the contrast of the virtual image by the display unit can be improved.

  In the display device described above, the combining unit includes a first end surface on which the first polarization component emitted from the transmission polarization unit is incident, and the second polarization component emitted from the display unit. An incident second end surface and a polarization reflecting surface that transmits the first polarization component incident from the first end surface and reflects the second polarization component incident from the second end surface And a third end face that emits the first polarization component that has been transmitted through the polarization reflection surface and the second polarization component that has been reflected by the polarization reflection surface. A polarizing plate disposed on the first end face is preferable.

  In this case, the light reflected from the transmission polarization section is transmitted by the polarization reflection surface, and the light incident from the display section is reflected by the simple configuration of reflecting the light incident from the display section. The light can be combined and incident on the polarizing device.

  In the above-described display device, a liquid crystal display element can be used as the display unit, and only the second polarization component that vibrates in the second polarization direction is transmitted through the light emitting surface. An organic EL display element provided with a polarizing plate or a polarization conversion element can be used. In these cases, an image utilizing the characteristics of each display element can be presented according to the use of the display device.

(A) And (b) is a top view which shows typically the head mounted display 10 which concerns on embodiment. 2 is a top view schematically showing the configuration of the internal structure of the head mounted display 10. FIG. 2 is a perspective view showing an eyepiece lens 220. FIG. It is sectional drawing which shows typically the internal structure of the organic electroluminescence display 101c which concerns on the example of a change. (A) And (b) is a side view which shows the eyepiece 220 which concerns on the example of a change.

  Hereinafter, various embodiments according to the present invention will be described with reference to the accompanying drawings. In the drawings, the ratio of dimensions of each part is appropriately changed from the actual one. In the present embodiment, the first polarization azimuth is the x direction and the second polarization azimuth is the z direction.

<A: Overall configuration>
FIGS. 1A and 1B are top views schematically showing an internal structure of a head mounted display (hereinafter referred to as HMD) 10 according to the present embodiment. As shown in FIG. 1, the HMD 10 includes at least a mounting portion 12 that can be mounted on the head 80, and an HMD main body 11 that is connected to the mounting portions 12 and 12 and disposed in front of human eyes 81. ing.

  As shown in FIG. 1, the mounting portion 12 is composed of a pair of temples that extend inward from both ends of the HMD main body 11, and contacts the heads on both sides to fix the HMD 10 to the head 80.

  The HMD main body 11 is provided with a housing in front of the user's eyes, and includes a display image generation unit 100 and a light guide unit 200 inside the housing. In addition, the housing | casing of the HMD main body 11 is the state by which the front is an open state, or transparent members, such as glass, are arrange | positioned.

  The display image generating means 100 is an optical system that emits image light and separates the image light into two directions orthogonal to the incident direction, and is provided at the central portion of the head 80. In the present embodiment, the display image generation unit 100 includes a display device 101, an objective lens 102, and a video light separation device 103.

  The display device 101 is a transmissive liquid crystal panel in this embodiment. The backlight unit includes a plurality of light sources that emit illumination light, and LEDs (light emitting diodes) are preferably used as the light sources. In addition, the display device 101 includes a drive circuit that controls supply of image signals and scanning signals to the display and driving of the light source. Further, a memory device is connected to the control means, and an external connection device for connecting to the external device is further connected.

  The image light separation device 103 is an optical system that distributes the image displayed on the display unit to the left and right eyes and presents it in front of the viewer's eyes through the polarization device. For example, a reflection mirror, a polarization beam splitter, etc. Various devices are used. The objective lens 102 is a lens that converges the image light emitted from the display device 101 at a predetermined magnification and enters the image light separation device 103, and is provided between the image light separation device 103 and the display device 101. ing. If the size of the virtual image to be presented is small, the objective lens 102 can be omitted.

  Such display image generation means 100 can employ various configurations. For example, as shown in FIG. 1A, a pair of display devices 101a and 101a that are symmetrical to each other, objective lenses 102a and 102a, and reflection mirrors 103a and 103a, and an image emitted from one display device 101a. The light may be guided to the right-eye light guiding unit 200, and the image light emitted from the other display device 101a may be guided to the right-eye light guiding unit 200. Also, for example, as shown in FIG. 1 (b), the image light emitted from the liquid crystal device is used for the right eye and the left eye by the objective lens 102b and the image light separation device 103b using one display device 101b. It is good also as a structure which isolate | separates into the image | video for image | video, and guides each light to the light guide means 200,200 for right eyes and left eyes.

  Further, although not shown, there is a light guide medium such as air or transparent plastic or glass between the display image generating means 100 and the light guide means 200, and there are lenses, and various types are available depending on the optical specifications of the HMD. The optical elements are arranged.

  Next, the right-eye and left-eye light guiding means 200, 200 will be described. FIG. 2 is a top view schematically showing the configuration of the internal structure of the head mounted display 10, and FIG. 3 is a perspective view showing an eyepiece 220 according to the present embodiment. In the present embodiment, of the pair of left and right light guide means 200 for convenience, only the left side configuration corresponding to the left eye of the user will be described, and the right side configuration will be omitted. Further, the display image generation unit 100 shown in FIG. 2 will be described by displaying only one of the pair of display screen generation units 100 and 100 shown in FIG.

  As shown in FIG. 2, the light guide unit 200 is an optical system device that is provided in front of the left eye and that makes the video light emitted from the display image generation unit 100 enter the left eye, and includes a polarization beam splitter 210, It is composed of an eyepiece lens 220 and a polarizing plate 212.

  The polarizing plate 212 transmits only polarized light (polarized light that becomes p-polarized light with respect to the polarizing beam splitter 210), which is the first polarized light component that vibrates at the first polarization azimuth, of the incident external light. It is a member. In the present embodiment, the polarizing plate 212 is disposed on the first end surface 210a, which is an end surface on the outside of the polarizing beam splitter 210 positioned in front of the observer's eye (left eye 81a in the figure). . For example, the polarizing plate 212 has a three-layer structure in which a polarizing element made of dyed PVA (polyvinyl alcohol) is sandwiched between two protective films made of TAC (triacetylcellulose).

  The polarization beam splitter 210 is a combining unit that combines p-polarized light and s-polarized light radiated from the display device 101 out of the external light emitted from the outside, and enters the eyepiece lens 220. The two prism parts made of glass having a triangular prism shape are bonded together to form a square shape as a whole. In the present embodiment, these two prism components are formed of a refractive material having the same refractive index, but a refractive material having a different refractive index can also be used.

  The polarization beam splitter 210 includes a first end face 210a on which the first polarization component emitted from the polarizing plate 212 is incident, and a second end face 210b on which the s-polarized light emitted from the display device 101 is incident. And a third end face 210c that emits p-polarized light that is external light and p-polarized light that is image light, and a fourth end face 210d that is disposed opposite to the second end face 210b.

  Further, the polarization beam splitter 210 is formed with a polarization reflection surface 211 having an angle of about 45 degrees with respect to the incident image light along the joining surface of the two prism components. The polarization reflection surface 211 is made of, for example, a dielectric multilayer film, and transmits p-polarized light incident from the first end surface 210a and reflects s-polarized light incident from the second end surface 210b. Note that the transmittance of the polarizing plate 212 is about 40%, and the polarizing plate 212 reduces the luminance of external light.

  With such a configuration, the p-polarized light emitted from the polarizing plate 212 and the s-polarized light emitted from the display device 101 are combined by the polarizing beam splitter 210 and are incident on the eyepiece lens 220.

  On the other hand, the eyepiece 220 is a lens member that is arranged in front of the user's eyes and presents an enlarged virtual image of the image displayed by the display device 101 to the user's eyes. In this embodiment, FIG. As shown, it is composed of a first lens 221 and a second lens 222.

  The first lens 221 is a lens formed of an isotropic refractive material in which the refractive index at the first polarization azimuth and the second polarization azimuth is the first refractive index n1. In this embodiment, glass is used as the first lens 221, and the refractive index n1 of the first polarization azimuth angle and the second polarization azimuth angle is 1.49.

  The second lens 222 has a first refractive index ne = n1 as a refractive index at the first polarization azimuth, and a first refractive index at a second polarization azimuth different from the first polarization azimuth. This is a lens formed of a birefringent material having a second refractive index no different from the refractive index ne. In the present embodiment, calcite is used as the second lens 222, the first refractive index ne is 1.49, and the second refractive index no is 1.66.

  In the present embodiment, the first lens 221 is a plano-concave lens in which the interface with the second lens 222 is formed as a concave surface, and the surface facing the interface is formed as a flat surface. A plano-convex lens in which the interface is formed as a convex surface and the surface facing the interface is formed as a flat surface, and the curved surfaces of the concave surface and the convex surface are the same.

  Then, the first lens 221 and the second lens 222 are bonded together by bonding the second lens 222 polished to a convex shape and the first lens 221 polished to a concave shape having the same radius of curvature as the convex surface. Are joined such that the refractive indexes of the refractive materials that are in contact with each other at the respective first polarization azimuth angles match, and the refractive indexes of the refractive materials that are in contact with each other at the second polarization azimuth angle are different. It has become.

  Such an eyepiece 220 has a first refractive index no = n1 for the first polarization azimuth angle coincident with each other at the interface where the first lens 221 and the second lens 222 are joined. Since the refractive materials are in contact with each other, there is almost no difference in refractive index. Regarding the second polarization azimuth, since refractive materials with different refractive indexes are in contact with each other, a difference in refractive index occurs.

  As a result, when light that is a combination of p-polarized light having the first polarization azimuth and s-polarized light having the second polarization azimuth is incident, the p-polarized light is refracted. The s-polarized light is refracted according to the difference in refractive index and transmitted.

  In the present embodiment, the eyepiece 220 has a lens formed at the interface between the first lens 221 and the second lens 222. Therefore, for the p-polarized light that vibrates at the first polarization azimuth angle, Since there is almost no difference in refractive index at the interface (curved surface), and both the light incident surface and the light exit surface are flat, the light is transmitted through the interface without receiving a lens action. On the other hand, the s-polarized light that vibrates at the second polarization azimuth angle has a refractive index difference at the interface (curved surface), and thus receives a convex lens action when passing through the interface.

  In such an embodiment, the light reflected from the polarizing plate 212 is transmitted by the polarization reflecting surface 211 and the light from the polarizing plate 212 is reflected by the simple configuration of reflecting the light incident from the display device 101. The light from the display device 101 can be combined and incident on the polarization beam splitter 210.

  Then, the p-polarized light emitted from the polarizing plate 212 and the s-polarized light emitted from the display device 101 are combined by the polarization beam splitter 210 and incident on the eyepiece lens 220, and the eyepiece lens 220 refracts the p-polarized light. In addition, the s-polarized light can be refracted and transmitted so that it can be presented in front of the viewer's eyes.

  As a result, when external light from the outside is incident on the polarizing plate 212, a see-through display device that combines and presents the scenery of the outside and the virtual image from the display device 101 can be configured. In this case, the image displayed on the display device 101 is presented in front of the eyes as an enlarged virtual image due to the convex lens action of the eyepiece lens 220, and external light passes through the eyepiece lens 220 without being refracted by the eyepiece lens 220. The outside world can be presented to the observer without distortion.

  At this time, since the polarizing plate 212 transmits only polarized light in a specific direction (p-polarized light in the polarizing beam splitter), the external light is attenuated when passing through the polarizing plate 212, and the intensity of the external light is weakened. The contrast of the virtual image by the display device 101 can be improved even in a bright outdoors.

  Furthermore, in this embodiment, since the transmittance of the polarizing plate 212 is about 40%, the intensity of external light is reduced by the polarizing plate 212 and enters the eye, while the image light emitted from the display device 101 is the polarizing plate 212. Therefore, the intensity of the image light hardly decreases. Therefore, it is possible to see a video display with high contrast even in a bright outdoors.

<B: Example of change>
The description of each embodiment described above is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made according to the design or the like as long as the technical idea according to the present invention is not deviated. Also in this modified example, the same components as those in the above-described embodiments are denoted by the same reference numerals, and the functions thereof are the same unless otherwise specified, and the description thereof is omitted.

  For example, in the above-described embodiment, the display device 101 is used as the display device. However, the present invention is not limited to this, and it is only necessary to emit light having a specific polarization component. For example, a liquid crystal display element is used to emit light. Alternatively, the organic EL display device 101c may include a polarizing plate or a polarization conversion element 110 that transmits only s-polarized light oscillating at the second polarization azimuth angle.

An organic EL display device using the polarization conversion element 110 will be described. FIG. 4 is a cross-sectional view schematically showing the internal structure of the organic EL display device 101c according to this modification. The organic EL display device 101c includes a metal cathode 111, an organic light emitting layer 112, an ITO electrode 113, and λ.
/ 4 film 115 and a reflective polarizing plate 116.

  The metal cathode 111 is an electrode that functions as an electrode of the organic EL device and also functions as a reflective layer. The organic light emitting layer 112 includes a plurality of organic EL thin films. The ITO electrode 113 is a pixel electrode having translucency and conductivity such as ITO (indium tin oxide).

  The reflective polarizing plate 116 is a member that reflects the first linearly polarized light component that oscillates in a specific direction in incident light and transmits the second linearly polarized light component that oscillates in a direction orthogonal thereto. The λ / 4 film 115 is a birefringent element that generates a phase difference of 90 degrees between orthogonal polarization components, and converts circularly polarized light (elliptical polarized light) into linearly polarized light or circularly polarized light into linearly polarized light.

  With such a configuration, for example, counterclockwise circularly polarized light is converted into second linearly polarized light that can be transmitted through the reflective polarizing plate by the λ / 4 film 115, and is transmitted through the reflective polarizing plate 116 and emitted. On the other hand, clockwise circularly polarized light is converted to first linearly polarized light reflected by the reflective polarizing plate by the λ / 4 film 115, reflected by the reflective polarizing plate 116, and incident on the metal cathode 111 and reflected. Is then converted into second circularly polarized light that can be transmitted through the reflective polarizing plate by the λ / 4 film 115 and transmitted through the reflective polarizing plate 116 and emitted. In this case, an image utilizing the characteristics of each display element can be presented according to the use of the display device.

  In the above-described embodiment, the eyepiece 220 has a configuration in which the interface of the first lens 221 is formed as a concave surface and the interface of the second lens 222 is formed as a concave and convex surface. However, the present invention is not limited to this. Rather, the first lens 221 and the second lens 222 are joined so that the respective refractive indexes coincide with each other at one polarization azimuth angle, and the refractive indexes of the respective refractive materials that are in contact with each other at the polarization azimuth angle orthogonal thereto. It suffices if the configuration is different. For example, as shown in FIG. 5A, the first lens 221a may be configured such that the interface with the second lens 222a is formed as a convex surface and the second lens 222 is formed as a concave surface. . Even in this case, the curved surface shapes of the convex surface and the concave surface are the same.

  In this case, the second lens 222a made of a birefringent material has a first refractive index no of 1.66, a second refractive index ne of 1.49, and a first lens 221a made of an isotropic refractive material. The refractive index n1 at 1 is 1.66, and the refractive index ne at the second polarization azimuth angle in the second lens 222a is smaller than the refractive index no = n1 at the first polarization azimuth angle. Even with such a configuration, a convex lens action can be realized.

  Further, in the above-described embodiment, the first lens 221 is a flat lens having an end surface facing the interface formed in a plane, and the second lens 222 is a flat lens having an end surface facing the interface formed in a plane. However, the present invention is not limited to this, and it is only necessary that the curvatures of the end surfaces of the first lens 221 and the second lens 222 facing the interface are the same. For example, as shown in FIG. As shown, curved end faces A and B may be used.

  Even in this case, the first lens 221b and the second lens 222b are bonded so that the refractive indices of the respective polarized light at the first polarization azimuth coincide with each other, and at the second polarization azimuth. The refractive indexes of the refractive materials that come into contact with each other become different. As a result, the p-polarized light emitted from the polarizing plate 212 and the s-polarized light emitted from the display device 101 are combined by the polarizing beam splitter 210. The light is incident on the eyepiece lens 220, and the p-polarized light is transmitted through the eyepiece lens 220 without being refracted, and the s-polarized light is refracted and transmitted to enlarge the image displayed on the display device in front of the eyes of the observer. A virtual image can be presented in an observable manner.

DESCRIPTION OF SYMBOLS 10,10a ... Head mounted display (HMD), 11 ... HMD main body, 12 ... Mounting part, 80 ... Head, 81 ... Binocular, 81a ... Left eye, 100 ... Display image generation means, 101, 101a, 101b, 101c DESCRIPTION OF SYMBOLS Display apparatus, 102 ... Objective lens, 102b ... Objective lens, 103, 103b ... Video light separation apparatus, 103a, 103a ... Reflection mirror, 110 ... Polarization conversion element, 111 ... Metal cathode, 112 ... Organic light emitting layer, 113 ... ITO Electrode, 115 ... λ / 4 film, 116 ... reflective polarizing plate, 200 ... light guide means, 210 ... polarizing beam splitter (combining unit), 210a ... first end face, 210b ... second end face, 210c ... third End surface 210d ... fourth end surface 211 ... polarization reflection surface 212 ... polarizing plate 220 ... eyepiece lens 221,221a, 221b ... first Lens, 222,222a, 222b ... second lens

Claims (6)

A first lens formed of a refractive material whose refractive index at the first polarization azimuth is the first refractive index;
The refractive index at the first polarization azimuth angle becomes the first refractive index, and the refractive index at the second polarization azimuth angle different from the first polarization azimuth angle is different from the first refractive index. A second lens formed of a refractive material having a refractive index of
The first and second lenses are bonded so that the first polarization azimuth angles of the first and second lenses coincide with each other, and the refractive indexes of the refractive materials that contact each other at the second polarization azimuth angle are different. A polarizing device characterized by the above. The first lens is a plano-concave lens in which an interface with the second lens is formed as a concave surface, and a surface facing the interface is formed into a plane.
The second lens is a plano-convex lens in which the interface is formed as a convex surface, and the surface facing the interface is formed as a plane.
The polarizing device according to claim 1, wherein the concave surface and the convex surface have the same curved shape. A display device comprising the polarizing device according to claim 1 or 2,
A transmission polarization part that transmits only the first polarization component that oscillates at the first polarization azimuth of the incident light; and
A display that emits only the second polarization component that vibrates at the second polarization azimuth;
A combining unit that combines the first polarization component emitted from the transmission polarization unit and the second polarization component emitted from the display unit, and enters the polarization device;
An optical system that presents an enlarged virtual image from the display unit in an observable manner in front of an observer's eyes through the polarizing device;
A display device comprising: The synthesis unit is
A first end face on which the first polarization component emitted from the transmission polarization unit is incident;
A second end face on which the second polarized component radiated from the display unit is incident;
A polarization reflecting surface that transmits the first polarization component incident from the first end surface and reflects the second polarization component incident from the second end surface;
A third end face that emits the first polarization component transmitted through the polarization reflection surface and the second polarization component reflected by the polarization reflection surface;
The display device, wherein the transmission polarization section is a polarizing plate disposed on the first end face.   The display device according to claim 3, wherein the display unit is a liquid crystal display element. The display unit is an organic EL display element including a polarizing plate or a polarization conversion element that transmits only the second polarization component that vibrates in the second polarization direction on a surface that emits light. The display device according to claim 3.

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