JP2018205614A - Display device - Google Patents

Abstract

To provide a display that can display a virtual image having a plurality of depths and can miniaturize and simplify the configuration.SOLUTION: A display device of the present invention comprises: one transmissive screen S that has one surface; and a translucent medium part TP that is provided on the one surface of the transmissive screen, and includes a plurality of transmissive media having different refractive indices in an in-plane direction of the one surface of the one transmissive screen.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device.

  In recent years, for example, so-called head-up displays have begun to be mounted near the driver's seat of a vehicle. The head-up display is a display device that displays driving support information such as vehicle information, road information, navigation information, and the like on a translucent display member called an image combiner (hereinafter also simply referred to as a combiner).

  For example, the head-up display displays the driving support information as described above as a virtual image in front of the windshield. The driving support information is visually recognized by the driver over the scenery in front of the vehicle. Therefore, the head-up display can provide the driving support information to the driver with little movement of the driver's line of sight.

  For example, Patent Literature 1 discloses a head-up display device having a projection device that emits projection light toward a first screen and a second screen. Further, it is disclosed that two virtual images having different depths are displayed using a first screen and a second screen.

Patent 5930231

  In a head-up display device such as Patent Document 1, it is necessary to provide two different screens in order to display virtual images having two different depths. That is, it is necessary to provide as many screens as the number of types of virtual images to be displayed. For this reason, in order to display a virtual image having a plurality of depths, an example of a problem is that the screen portion becomes complicated and large.

  The present invention has been made in view of the above points, and it is an object of the present invention to provide a display device capable of displaying a virtual image having a plurality of depths and capable of downsizing and simplifying the structure. I am trying.

  According to a first aspect of the present invention, there is provided one transmissive screen having one surface, the first transmissive screen provided on the surface of the first surface, and an in-plane direction of the first surface of the screen. And a translucent medium portion including a plurality of translucent media having different refractive indexes.

  According to a seventh aspect of the present invention, there is provided a light source that irradiates light to a predetermined irradiation region, a light incident surface that is arranged in the irradiation region and is incident on the light, and a light emission surface that emits the transmitted light. And a translucent medium including a plurality of translucent media provided on the light exit surface of the transmissive screen and having different refractive indexes in the in-plane direction of the light exit surface of the screen And an optical member having a concave reflecting surface provided in a region on the light emitting surface side of the transmissive screen.

1 is a side view illustrating an overview of a display device according to Example 1. FIG. FIG. 3 is a perspective view of a screen portion of the display device according to the first embodiment. 6 is a side view illustrating an outline of a display device according to Example 2. FIG. 6 is a perspective view of a screen portion of a display device according to Embodiment 2. FIG. FIG. 10 is a side view illustrating an outline of a display device according to a third embodiment. 6 is a perspective view of a screen portion of a display device according to Embodiment 3. FIG. It is a perspective view of the screen part of the display apparatus which concerns on a modification. It is a perspective view of the screen part of the display apparatus which concerns on a modification.

  Examples of the present invention will be described in detail below. In the following description, a head-up display (HUD: Head-Up Display) using, for example, a windshield of a combiner or a car as a display unit will be described as an example of the display device.

  Hereinafter, with reference to FIG. 1, the structure of the display apparatus 10 which concerns on Example 1 of this application is demonstrated. FIG. 1 is a side view illustrating the outline of the display device 10 according to the first embodiment. The display device 10 is, for example, an image combiner having a concave mirror reflector or a head-up display that displays a virtual image V on a windshield of an automobile or the like. In FIG. 1, the virtual image V displayed by the display device 10 is indicated by a broken line. FIG. 1 also shows the position of the eyes of an observer who observes the virtual image V, for example, the driver of the vehicle, as the viewpoint EY.

  For example, the light source 11 emits laser light as irradiation light EL from the irradiation unit 11A, and can scan an image or video (hereinafter simply referred to as an image) by scanning with the irradiation light EL. That is, a laser projector device. The light source 11 emits light for performing color expression and gradation expression of an image as irradiation light EL in a direction along the optical axis AX. In other words, the light source 11 is a light source that irradiates the irradiation light EL toward a predetermined irradiation direction.

  In the following description, the direction along the optical axis AX will be described as the front-rear direction (X-axis direction). Further, the irradiation direction of the irradiation light EL will be described as the front. 1 is defined as the width direction (Y-axis direction), and the direction perpendicular to the front-rear direction and the width direction is defined as the height direction (Z-axis direction).

  The screen unit 13 is arranged in the emission direction of the irradiation light EL when viewed from the light source 11. That is, the screen unit 13 is disposed on the optical axis AX in front of the light source 11. The screen unit 13 has a plate-like screen S disposed on the optical axis AX.

  The screen S is a plate-shaped transmission screen such as a diffusion plate that scatters the irradiation light EL. In the screen S, a surface facing the light source 11, that is, a surface on which the irradiation light EL is incident is an incident surface IS as a light incident surface. Further, the screen S has a surface opposite to the incident surface IS, that is, a surface from which the irradiation light EL that has passed through the screen S is emitted as an emission surface ES as a light emission surface. The light emitted from the light source 11 is scattered by the screen S, and projection light including an image is generated.

  The screen S may be a plate-like transmission screen that can change between a light transmission state and a light scattering state. In this case, for example, as a screen S, a so-called functional liquid crystal film that can be changed between a light transmission state and a light scattering state by applying a voltage to a transparent substrate such as a glass substrate is attached. Can be used.

  Specifically, it is possible to use as the screen S what is provided with a functional liquid crystal film so that wiring is performed on a transparent substrate such as a glass substrate and the glass substrate is electrically connected to the wiring. . As the functional liquid crystal film, for example, “SILF (registered trademark)” manufactured by Shoko Electric Co., Ltd. or MIYO-film manufactured by Kyushu Nanotech Optical Co., Ltd. can be used.

  The screen unit 13 includes a transparent member TM that is fixed to the emission surface ES of the screen S and is made of a light-transmitting material such as glass or a light-transmitting resin at the bottom of the screen S. The transparent member TM has a planar shape smaller than the exit surface ES of the screen S when viewed from the direction along the optical axis AX, and has a rectangular parallelepiped shape with a thickness T along the optical axis AX. doing.

  The transparent member TM may be a light-transmitting substrate such as a glass substrate or an acrylic substrate that is a member having a light-transmitting property with respect to visible light. As the translucent resin used as the material of the transparent member TM, an acrylic resin, a silicone resin, or the like can be used.

  FIG. 2 is a perspective view of the screen unit 13. As shown in FIG. 2, the transparent member TM is in contact with the central portion of one side of the exit surface ES of the screen S as viewed from the direction along the optical axis AX on the exit surface ES, that is, the direction along the X axis. It is arranged. Further, the transparent member TM is not in contact with the other side of the emission surface ES of the screen S. That is, a part of the screen S overlaps with the transparent member TM when viewed from the direction along the X axis.

  Air having a refractive index lower than the refractive index of the transparent member TM exists in a region where the transparent member TM does not exist in the region on the emission surface ES of the screen S. That is, the air layer AL is present in a region where the transparent member TM does not exist in the region on the emission surface ES. That is, on the exit surface ES, a light-transmitting medium part TP including a transparent member TM and an air layer AL, which are two light-transmitting media having different refractive indexes, is formed as a light propagation medium. Accordingly, the projection light emitted from the exit surface ES of the screen S includes the projection light PL1 propagating through the air layer AL and the projection light PL2 propagating through the transparent member TM.

  The combiner 15 is a translucent plate-like member that is disposed on the side opposite to the light source 11 and on the optical axis AX when viewed from the screen portion 13. The platen of the combiner 15 is curved convexly in one direction. That is, the combiner 15 has a concave surface 15 </ b> S that is a reflective surface facing the screen portion 13. The projection light PL1 and the projection light PL2 incident on the concave surface 15S are reflected and reach the driver's viewpoint EY.

  In this case, when viewed from the viewpoint EY, the virtual image V is visually recognized through the combiner 15 in the space area on the opposite side of the combiner 15. That is, the combiner 15 is configured to form a virtual image in the space area on the convex surface side when the projection light PL1 and the projection light PL2 enter from the concave surface 15S side.

  As described above, the irradiation light EL that has reached the screen S is scattered by the screen S, and the projection lights PL1 and PL2 are emitted from the emission surface ES of the screen S. The projection light PL1 is projection light that is emitted from the screen S and passes through the air layer AL without passing through the transparent member TM. The projection light PL2 is projection light that is emitted from the screen S and passes through the transparent member TM.

  As described above, in the region on the exit surface ES, the transparent member TM and the air layer AL exist as the medium that propagates the projection light PL1 and the projection light PL2. Further, the transparent member TM through which the projection light PL2 propagates has a higher refractive index than the air through which the projection light PL1 propagates.

  Therefore, the distance from the exit surface ES of the screen S to the concave surface 15S of the combiner 15 is substantially the same in any region of the exit surface ES, but the optical distance from the exit surface ES to the concave surface 15S is the same as that of the projection light PL1. It differs depending on the projection light PL2. Specifically, the optical distance of the projection light PL2 from the exit surface ES to the concave surface 15S is longer than the optical distance of the projection light PL1.

  More specifically, glass is used as the material of the transparent member TM, the refractive index of air is 1.0, and the refractive index of the glass used for the transparent member TM is 1.5. Then, the optical distance from the exit surface ES of the screen S to the concave surface 15S of the combiner 15 is longer by 1.5T−1.0T = 0.5T in the projection light PL2 than in the projection light PL1.

  In terms of the apparent distance, the apparent distance from the combiner 15 is 1.0T− from the region where the projection light PL2 is emitted from the region where the projection light PL1 is emitted from the emission surface EL of the screen S. It is shortened by 1.0 / 1.5 · T≈0.33T. Therefore, the virtual image V2 is formed closer to the combiner 15 than the virtual image V1 by a distance based on the difference in the apparent distance of 0.33T.

  Accordingly, the virtual image V2 formed by the projection light PL2 is formed closer to the virtual image V1 formed by the projection light PL1 when viewed from the viewpoint EY. Note that the shape of the virtual image V1 is a shape based on a shape obtained by removing the transparent member TM from the planar shape of the screen S viewed from the direction along the optical axis AX. Further, the shape of the virtual image V2 is a shape based on the shape of the transparent member TM viewed from the direction along the optical axis AX.

  According to the display device 10 of the first embodiment, it is possible to form virtual images having two types of depths with one screen. As a result, it is possible to form virtual images having a depth greater than the number of screens. Accordingly, it is possible to reduce the number of screens necessary for forming a virtual image having a predetermined number of depths, and to achieve downsizing and simplification of the structure of the apparatus.

  Hereinafter, the display device 20 of Example 2 of the present application will be described with reference to FIGS. 3 and 4. The display device 20 according to the second embodiment has the same configuration except that the screen unit 23 is different from the screen unit 13 according to the first embodiment. Therefore, the configuration of the screen portion 23 and the virtual image formed will be mainly described below.

  FIG. 3 is a side view illustrating the outline of the display device 20 according to the second embodiment. In the display device 20, unlike the display device 10 of the first embodiment, the screen unit 23 includes two screens, a first screen S1 and a second screen S2. The first screen S <b> 1 and the second screen S <b> 2 are plate-like transmission screens that can change states between a light transmission state and a light scattering state.

  As described above, for example, as the first screen S1 and the second screen S2, it is possible to change the state between a light transmission state and a light scattering state by applying a voltage to a transparent substrate such as a glass substrate. It is possible to use a film to which a so-called functional liquid crystal film is attached.

  Specifically, wiring is performed on a transparent substrate such as a glass substrate, and a functional liquid crystal film attached to the glass substrate so as to be electrically connected to the wiring is the first and second screens S1. And S2. As the functional liquid crystal film, for example, “SILF (registered trademark)” manufactured by Shoko Electric Co., Ltd. or MIYO-film manufactured by Kyushu Nanotech Optical Co., Ltd. can be used.

  In the display device 20, one of the first screen S1 and the second screen S2 is selected in either the first screen S1 or the second screen S2 by setting one of the first screen S1 and the second screen S2 in a scattering state and the other in a light transmission state. It is possible to scatter the irradiation light EL.

  FIG. 4 is a perspective view of the screen unit 23. As shown in FIG. 4, specifically, the screen unit 23 has a structure in which the second screen S2 is attached to the surface of the screen unit 13 of the display device 10 of Example 1 that faces the combiner 15 of the transparent member TM. It has become. In other words, the screen portion 23 has a structure in which a transparent member TM having a thickness T is sandwiched between two screens S1 and S2.

  As described above, since the transparent member TM is sandwiched between the first screen S1 and the second screen S2, the first screen S1 and the second screen S2 are subjected to strong vibrations that occur when mounted on an automobile or the like. It is possible to prevent the relative position of the screen S2 from changing.

  The first screen S1, the second screen S2, and the transparent member TM are preferably optically bonded or optically bonded. That is, when the first screen S1 and the second screen S2 and the transparent member TM are bonded or bonded (hereinafter referred to as bonding or the like), the adhesive or bonding material used for the bonding or the like is the first. It is preferable that the screen S1 and the second screen S2 and the light passing through the transparent member TM are bonded in a manner that does not optically affect the light.

  Specifically, for example, the first screen S1 and the second screen S2 and the transparent member TM are preferably bonded using a transparent optical adhesive (OCA: Optical Clear Adhesive) film. In bonding the first screen S1 and the second screen S2 and the transparent member TM with the transparent optical adhesive film, it is preferable to use an air bonding apparatus or a vacuum bonding apparatus.

  In addition, the first screen S1 and the second screen S2 and the transparent member TM may be bonded using an optical resin (OCR: Optical Clear Resin).

  The region on the emission surface ES1 of the first screen S1, that is, the region between the first screen S1 and the second screen S2, where the transparent member TM is not present, is lower than the refractive index of the transparent member TM. Air having a refractive index is present. That is, the air layer AL is present in a region where the transparent member TM is not present in the region on the emission surface ES1.

  In other words, the light-transmitting medium part TP including the transparent member TM and the air layer AL, which are two light-transmitting media having different refractive indexes, are formed on the emission surface ES1. Accordingly, the projection light emitted from the screen unit 23 includes the projection light PL1 emitted from the emission surface ES1 of the first screen S1 and propagating through the air layer AL and the projection light PL2 propagating through the transparent member TM.

  In addition, the projection light PL3 emitted from the emission surface ES2 of the second screen S2 exists in the projection light emitted from the screen unit 23.

  As in the case of the first embodiment, the transparent member TM and the air layer AL are present on the emission surface EL1 of the first screen S1 as a medium for propagating the projection light PL1 and the projection light PL2. Further, the transparent member TM through which the projection light PL2 propagates has a higher refractive index than the air through which the projection light PL1 propagates.

  Therefore, the distance from the exit surface ES1 of the first screen S1 to the concave surface 15S of the combiner 15 is almost the same in any region of the exit surface ES1, but the optical distance from the exit surface ES1 to the concave surface 15S is projected. It differs between the light PL1 and the projection light PL2. Specifically, the optical distance of the projection light PL2 from the exit surface ES1 to the concave surface 15S is longer than the optical distance of the projection light PL1.

  More specifically, glass is used as the material of the transparent member TM, the refractive index of air is 1.0, and the refractive index of the glass used for the transparent member TM is 1.5. Then, the optical distance from the exit surface ES1 of the first screen S1 to the concave surface 15S of the combiner 15 is 1.5T−1.0T = 0.5T longer in the projection light PL2 than in the projection light PL1. .

  In other words, in terms of the apparent distance, the apparent distance from the combiner 15 is greater than the area where the projection light PL1 is emitted from the emission surface EL1 of the first screen S1 to the area where the projection light PL2 is emitted. Is shorter by 1.0T−1.0 / 1.5 · T≈0.33T. Therefore, the virtual image V2 is formed closer to the combiner 15 than the virtual image V1 by a distance based on the difference in the apparent distance of 0.33T.

  Accordingly, the virtual image V2 formed by the projection light PL2 is formed closer to the virtual image V1 formed by the projection light PL1 when viewed from the viewpoint EY. The shape of the virtual image V1 is a shape based on a shape obtained by removing the transparent member TM from the planar shape of the first screen S1 viewed from the direction along the optical axis AX. Further, the shape of the virtual image V2 is a shape based on the shape of the transparent member TM viewed from the direction along the optical axis AX.

  Furthermore, as described above, in the display device 20 according to the second embodiment, there is the projection light PL3 emitted from the emission surface ES2 of the second screen S2. The distance from the exit surface ES2 of the second screen S2 to the combiner 15 is closer than the distance from the exit surface ES1 of the first screen S1 to the combiner.

  Therefore, according to the display device 20, the virtual image V3 is formed at a position closer to the combiner 15 than the virtual image V2 by the projection light PL3.

  According to the display device 20 of the second embodiment, similarly to the first embodiment, it is possible to form virtual images having two types of depths with one screen. As a result, it is possible to form virtual images having a depth greater than the number of screens. Accordingly, it is possible to reduce the number of screens necessary for forming a virtual image having a predetermined number of depths, and to achieve downsizing and simplification of the structure of the apparatus.

  Further, according to the display device 20 of the twentieth embodiment, the relative positional relationship between the first screen S1 and the second screen S2 is hardly changed by an external force such as vibration. Therefore, even if vibration etc. generate | occur | produce, the relative positional relationship of each virtual image V formed can be maintained, and it is possible to produce a high-quality virtual image display.

  Hereinafter, the display device 30 of Example 3 of the present application will be described with reference to FIGS. The display device 30 of the third embodiment has the same configuration except that the configuration of the screen section 33 is different from the screen section 13 of the first embodiment. Therefore, hereinafter, the configuration of the screen unit 33 and the formed virtual image will be mainly described.

  FIG. 5 is a side view illustrating the outline of the display device 30 according to the third embodiment. In the display device 30, unlike the display device 10 of the first embodiment, the screen unit 33 includes two screens, a first screen S1 and a second screen S2. The first screen S <b> 1 and the second screen S <b> 2 are plate-like transmission screens that can change states between a light transmission state and a light scattering state.

  As described above, for example, as the first screen S1 and the second screen S2, it is possible to change the state between a light transmission state and a light scattering state by applying a voltage to a transparent substrate such as a glass substrate. It is possible to use a film to which a so-called functional liquid crystal film is attached. Since the specific example has been described in the first and second embodiments, it will be omitted.

  Similar to the display device 20 of the second embodiment, in the display device 30, one of the first screen S <b> 1 and the second screen S <b> 2 is in a scattering state and the other is in a light transmission state, whereby the first screen S <b> 1. It is possible to selectively scatter the irradiation light EL in any one of the second screen S2.

  FIG. 6 shows a perspective view of the screen portion 33. As shown in FIG. 6, the screen unit 33 has a structure in which the second screen S <b> 2 is arranged in a region on the incident surface IS (see FIG. 1) side of the screen S of the screen unit 13 of the display device 10 of the first embodiment. It has become.

  Air having a refractive index lower than the refractive index of the transparent member TM is present in a region where the transparent member TM is not present in the region on the emission surface ES1 of the first screen S1. That is, the air layer AL is present in a region where the transparent member TM is not present in the region on the emission surface ES1.

  In other words, the light-transmitting medium part TP including the transparent member TM and the air layer AL, which are two light-transmitting media having different refractive indexes, are provided on the exit surface ES1. Accordingly, the projection light emitted from the screen unit 33 includes the projection light PL1 emitted from the emission surface ES1 of the first screen S1 and propagating through the air layer AL and the projection light PL2 propagating through the transparent member TM.

  The projection light emitted from the screen unit 33 includes the projection light PL3 that is emitted from the emission surface ES2 of the second screen S2 and propagates through the air layer AL and the projection light PL4 that propagates through the transparent member TM.

  As in the case of the first embodiment, the transparent member TM and the air layer AL are present on the emission surface EL1 of the first screen S1 as a medium for propagating the projection light PL1 and the projection light PL2. Further, the transparent member TM through which the projection light PL2 propagates has a higher refractive index than the air through which the projection light PL1 propagates.

  Therefore, the distance from the exit surface ES1 of the first screen S1 to the concave surface 15S of the combiner 15 is almost the same in any region of the exit surface ES1, but the apparent distance to the concave surface 15S is the projected light PL1 of the exit surface ES1. And the region where the projection light PL2 is emitted. Specifically, the apparent distance to the concave surface 15S is shorter from the region that emits the projection light PL2 on the exit surface ES1 than from the region that emits the projection light PL1 on the exit surface ES1.

  More specifically, the apparent distance to the concave surface 15S of the combiner 15 is 1.0T− from the region where the projection light PL2 of the emission surface ES1 is emitted from the region where the projection light PL1 of the emission surface ES1 is emitted. It is shortened by 1.0 / 1.5 · T≈0.33T. Therefore, the virtual image V2 is formed closer to the combiner 15 than the virtual image V1 by a distance based on the difference in the apparent distance of 0.33T.

  Accordingly, the virtual image V2 formed by the projection light PL2 is formed closer to the virtual image V1 formed by the projection light PL1 when viewed from the viewpoint EY. The shape of the virtual image V1 is a shape based on a shape obtained by removing the transparent member TM from the planar shape of the first screen S1 viewed from the direction along the optical axis AX. Further, the shape of the virtual image V2 is a shape based on the shape of the transparent member TM viewed from the direction along the optical axis AX.

  Furthermore, as described above, in the display device 30 according to the third embodiment, the projection light PL3 that exits from the exit surface ES2 of the second screen S2 and passes through the air layer AL and the projection light PL4 that passes through the transparent member TM are present. To do. The distance from the exit surface ES2 of the second screen S2 to the combiner 15 is closer than the distance from the exit surface ES1 of the first screen S1 to the combiner 15.

  Therefore, depending on the display device 30, virtual images V3 and V4 are formed at a position closer to the combiner 15 than the virtual image V2.

  Similar to the apparent distance between the exit surface ES1 of the first screen S1 and the concave surface 15S of the combiner 15, the apparent distance from the concave surface 15S of the combiner 15 varies depending on the region of the exit surface ES2 of the second screen S2. Therefore, the virtual image V4 is formed at a position closer to the combiner 15 than the virtual image V3.

  According to the display device 30 of the third embodiment, similarly to the first embodiment, it is possible to form virtual images having two types of depths with one screen. As a result, it is possible to form virtual images having a depth greater than the number of screens. Therefore, it is possible to reduce the number of screens necessary for forming a virtual image having a predetermined number of depths, and to achieve downsizing and simplification of the apparatus.

[Modification]
In the said Example, the example which forms the translucent medium part TP with the transparent member TM and the air layer AL was demonstrated. The translucent medium part TP may be formed by a plurality of translucent members.

  FIG. 7 shows a perspective view of the screen portion 43 when the translucent medium portion TP is formed of a plurality of translucent members. As shown in FIG. 7, instead of the air layer AL of the screen unit 13 of the first embodiment, for example, a second transparent member TM2 made of a translucent solid material such as acrylic resin or glass may be used. That is, the translucent medium portion TP may be formed by the first transparent member TM1 and the second transparent member TM2 having a refractive index different from that of the first transparent member TM1.

  In this case, which of the virtual images V1 and V2 is formed at a position closer to the combiner 15 is determined depending on the refractive index of the first transparent member TM1 and the second transparent member TM2.

  According to the mode of the modified example shown in FIG. 7, a light-transmitting solid material can be used in place of the air layer AL of the second and third embodiments.

  As shown in FIG. 8, the transparent member TM of the screen unit 13 may be provided on the incident surface side of the screen S in the display device 10 of the first embodiment. By doing so, the outgoing light EL is slightly refracted when passing through the transparent member TM, and the incident angle to the screen S changes. Therefore, it is possible to reduce the virtual image displayed by the projection light PL2 emitted from the screen S.

  In the above embodiment, the screens S, S1 and S2 are diffusing plates or functional liquid crystal films. However, the screens S, S1 and S2 may be transmissive screens or holographic diffusers having microlenses or the like. For example, the screens S, S1, and S2 may be transmissive diffusion screens having liquid crystal microlenses and the like.

  In the above-described embodiment, the case where the light source 11 is a laser projector has been described as an example. However, the light source 11 may be a light source composed of a DLP (Digital Light Processing) projector using a DMD (Digital Mirror Device). Good. Further, the light source 11 may be a light source composed of a liquid crystal projector.

  Further, the position where the transparent member TM is provided on the exit surface S or S1 of the screen S or S1 or the shape of the transparent member TM is not limited to the position exemplified in the above description. For example, the position and shape of the virtual image can be freely changed by changing the position of the transparent member TM. Further, the depth position of the virtual image can be changed by changing the refractive index and the thickness of the transparent member TM.

  Various configurations and the like in the above-described embodiments are merely examples, and can be appropriately selected according to the usage and the like.

10, 20, 30 Display device 11 Light source 13, 23, 33, 43 Screen part 15 Combiner 15S Concave surface S Screen S1 First screen S2 Second screen TP Translucent medium part TM Transparent member AL Air layer IS Incident surface ES Output surface

Claims (5)

One transmissive screen having one surface;
A translucent material including a plurality of translucent media provided on the surface of the one surface of the one transmissive screen and having different refractive indexes in the in-plane direction of the one surface of the one transmissive screen. A media section;
A display device comprising:   The display device according to claim 1, wherein the translucent medium part includes a translucent member provided on the surface of the one surface of the one transmissive screen.   The said translucent medium part is provided on the surface of said 1 surface of said 1 transmissive screen, and contains several translucent members which have a mutually different refractive index. Display device.   The display device according to claim 2, further comprising another transmissive screen that sandwiches the translucent member together with the first transmissive screen. A light source that emits light in a predetermined irradiation direction;
A transmissive screen arranged in the irradiation direction and having a light incident surface on which the light is incident and a light emitting surface that emits the transmitted light;
A translucent medium portion including a plurality of translucent media provided on the light exit surface of the transmissive screen and having different refractive indexes in an in-plane direction of the light exit surface of the screen;
An optical member having a reflective surface on a concave surface provided in a region on the light emitting surface side of the transmissive screen;
A display device comprising:

Images