JP2023039992A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of displaying a virtual image having a plurality of depths, and capable of downsizing and simplifying a configuration.

SOLUTION: A display device includes: one transmission type screen having one surface and a translucent medium part provided on the surface of the transmission type screen and including a plurality of translucent medium having different refractive index in an in-plane direction of the surface of the transmission type screen.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to display devices.

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

The head-up display, for example, displays the driving support information as described above as a virtual image in front of the windshield. The driving support information is superimposed on the scenery in front of the vehicle and viewed by the driver. Therefore, the head-up display can provide the driving support information to the driver without almost moving the line of sight of the driver.

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. It also discloses that two virtual images with different depths are displayed using a first screen and a second screen.

Patent No. 5930231

A head-up display device such as that disclosed in Patent Document 1 needs to provide two different screens to display virtual images having two different depths. That is, it is necessary to provide as many screens as the number of types of depths 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.

SUMMARY OF THE INVENTION 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 having a compact and simple structure. I'm trying.

The invention according to claim 1 has a light source that irradiates light in a predetermined irradiation direction, a light entrance surface that is arranged in the irradiation direction and into which the light is incident, and a light exit surface that outputs the transmitted light. and a transmissive screen that can change its state between a light transmitting state and a light scattering state; another transmissive screen having a first surface facing to and capable of changing state between a light transmitting state and a light scattering state; and the first surface of the other transmissive screen or the first a translucent member arranged only in one region on a second surface opposite to the surface, and a concave reflecting surface provided in a region of the transmissive screen on the light exit surface side and when the one translucent member is arranged on the first surface, the light emitted from the other transmissive screen via the one region is , the light transmitted through the one transmissive screen in a light scattering state or the other transmissive screen in a light scattering state, wherein the one translucent member is disposed on the second surface , the light emitted from the one translucent member through the one region is light transmitted through the one transmissive screen in a light scattering state or the other transmissive screen in a light scattering state. A display device characterized by:

1 is a side view showing an overview of a display device according to Example 1; FIG. 4 is a perspective view of a screen portion of the display device according to Example 1. FIG. FIG. 11 is a side view showing an overview of a display device according to Example 2; FIG. 11 is a perspective view of a screen portion of a display device according to Example 2; FIG. 11 is a side view showing an outline of a display device according to Example 3; FIG. 11 is a perspective view of a screen portion of a display device according to Example 3; FIG. 11 is a perspective view of a screen portion of a display device according to a modification; FIG. 11 is a perspective view of a screen portion of a display device according to a modification;

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

The configuration of the display device 10 according to Example 1 of the present application will be described below with reference to FIG. FIG. 1 is a side view showing an overview 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 the windshield of an automobile or the like. In addition, in FIG. 1, the virtual image V displayed by the display device 10 is indicated by a dashed line. FIG. 1 also shows the position of the eyes of an observer who observes the virtual image V, for example, the driver of a vehicle, as a viewpoint EY.

The light source 11 is, for example, a laser light source capable of projecting an image or video (hereinafter simply referred to as an image) by emitting a laser beam as the irradiation light EL from the irradiation unit 11A and scanning with the irradiation light EL. , that is, a laser projector device. The light source 11 emits light for 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 emits the irradiation light EL in a predetermined irradiation direction.

In the following description, the direction along the optical axis AX is defined as the front-rear direction (X-axis direction). Also, the irradiation direction of the irradiation light EL is assumed to be forward. The direction perpendicular to the plane of FIG. 1 is the width direction (Y-axis direction), and the front-rear direction and the direction perpendicular to the width direction are the height direction (Z-axis direction).

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

The screen S is a plate-like transmissive screen such as a diffusion plate that scatters the irradiation light EL. The surface of the screen S facing the light source 11, that is, the surface on which the irradiation light EL is incident is an incident surface IS as a light incident surface. In addition, the surface of the screen S opposite to the incident surface IS, that is, the surface from which the irradiation light EL that has passed through the screen S is emitted is an emission surface ES as a light emission surface. Light emitted from the light source 11 is scattered by the screen S to generate projection light containing an image.

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

Specifically, a transparent substrate such as a glass substrate is provided with wiring, and a functional liquid crystal film is attached to the glass substrate so as to be electrically connected to the wiring. . As the functional liquid crystal film, for example, “SILF (registered trademark)” manufactured by Seiko Electric Co., Ltd. or MIYO-film manufactured by Kyushu Nanotech Optical Co., Ltd. can be used.

The screen part 13 has a transparent member TM which is fixed to the output surface ES of the screen S at the bottom of the screen S and made of a translucent material such as glass or a translucent resin. The transparent member TM has a planar shape smaller than the exit surface ES of the screen S when viewed along the optical axis AX, and has a rectangular parallelepiped shape with a thickness T along the optical axis AX. are doing.

The transparent member TM may be, for example, a translucent substrate such as a glass substrate or an acrylic substrate, which is a member translucent to visible light. Acrylic resin, silicone resin, or the like can be used as the translucent resin that is the material of the transparent member TM.

FIG. 2 shows a perspective view of the screen portion 13. As shown in FIG. As shown in FIG. 2, the transparent member TM is in contact with the center of one side of the exit surface ES of the screen S when viewed from the direction along the optical axis AX, that is, the direction along the X axis on the exit surface ES. are distributed. Further, the transparent member TM is not in contact with other sides of the exit surface ES of the screen S. That is, a portion of the screen S overlaps 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 the region on the exit surface ES of the screen S where the transparent member TM does not exist. That is, the air layer AL exists in the area where the transparent member TM does not exist among the areas on the exit surface ES. That is, on the exit surface ES, a light-transmitting medium portion TP including a transparent member TM and an air layer AL, which are two light-transmitting media having different refractive indices, is formed as a medium for propagating light. Therefore, 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 disposed on the side opposite to the light source 11 when viewed from the screen portion 13 and on the optical axis AX. The plate surface of the combiner 15 is convexly curved in one direction. That is, the combiner 15 has a concave surface 15S that is a reflecting surface facing the screen section 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 spatial region 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 illumination light EL reaching the screen S is scattered by the screen S, and the projection light 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. Projection light PL2 is projection light emitted from the screen S and passing through the transparent member TM.

As described above, in the area on the exit surface ES, the transparent member TM and the air layer AL exist as media for propagating the projection light PL1 and the projection light PL2. 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 almost the same in any area of the exit surface ES, but the optical distance from the exit surface ES to the concave surface 15S is the projection light PL1. The projection light PL2 is different. 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 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 1.5T-1.0T=0.5T longer for the projection light PL2 than for the projection light PL1.

In terms of the apparent distance, the apparent distance from the combiner 15 is 1.0T−1. 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 the distance based on the apparent distance difference of 0.33T.

Therefore, the virtual image V2 formed by the projection light PL2 is formed closer to the viewpoint EY than the virtual image V1 formed by the projection light PL1. The shape of the virtual image V1 is based on the planar shape of the screen S viewed from the direction along the optical axis AX with the portion of the transparent member TM removed. Also, the shape of the virtual image V2 is 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 different depths on one screen. As a result, it is possible to form virtual images with more depth than the number of screens. Therefore, it is possible to reduce the number of screens required to form virtual images of a predetermined number of depths, and it is possible to achieve miniaturization and simplification of the structure of the device.

The display device 20 of Example 2 of the present application will be described below with reference to FIGS. 3 and 4. FIG. The display device 20 of Example 2 has the same configuration as that of the screen portion 13 of Example 1 except that the configuration of the screen portion 23 is different. Therefore, the configuration of the screen unit 23 and the virtual image formed will be mainly described below.

FIG. 3 is a side view showing an overview 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 section 23 includes two screens, a first screen S1 and a second screen S2. The first screen S1 and the second screen S2 are plate-like transmissive screens that can change state between a light transmitting state and a light scattering state.

As described above, for example, the first screen S1 and the second screen S2 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. It is possible to use a so-called functional liquid crystal film attached.

Specifically, wiring is provided on a transparent substrate such as a glass substrate, and a functional liquid crystal film is adhered to the glass substrate so as to be electrically connected to the wiring. and S2. As the functional liquid crystal film, for example, “SILF (registered trademark)” manufactured by Seiko 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 placed in the scattering state and the other is placed in the light transmission state, thereby selecting either the first screen S1 or the second screen S2. It is possible to effectively scatter the irradiation light EL.

FIG. 4 shows a perspective view of the screen portion 23. As shown in FIG. Specifically, as shown in FIG. 4, the screen unit 23 has a structure in which a second screen S2 is attached to the surface of the transparent member TM of the screen unit 13 of the display device 10 of the first embodiment facing the combiner 15. It's becoming In other words, the screen section 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 S1 and the second screen S1 are prevented from being subjected to strong vibrations generated when the screen is 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 and 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 adhered or laminated (hereinafter referred to as adhesion or the like), the adhesive or laminating material used for the adhesion or the like is the first screen S1 or the second screen S2. It is preferable that the screen S1 and the second screen S2 are adhered to each other in such a manner as not to optically affect the light passing through the transparent member TM.

Specifically, for example, the first screen S1 and the second screen S2 and the transparent member TM are preferably bonded using a transparent optical clear adhesive (OCA) film. In the adhesion of the first screen S1 and the second screen S2 to the transparent member TM by the transparent optical adhesive film, it is preferable to use an atmospheric bonding device or a vacuum bonding device.

Further, the bonding between the first screen S1 and the second screen S2 and the transparent member TM may be performed using an optical resin (OCR: Optical Clear Resin).

A region on the exit surface ES1 of the first screen S1, that is, a region sandwiched between the first screen S1 and the second screen S2 where the transparent member TM does not exist has a refractive index lower than that of the transparent member TM. Air exists, which has an index of refraction. That is, the air layer AL exists in the area where the transparent member TM does not exist among the areas on the exit surface ES1.

In other words, on the exit surface ES1, a light-transmitting medium portion TP including a transparent member TM and an air layer AL, which are two light-transmitting media having different refractive indices, is formed as a medium for propagating light. Therefore, projection light emitted from the screen section 23 includes projection light PL1 emitted from the emission surface ES1 of the first screen S1 and propagating through the air layer AL and projection light PL2 propagating through the transparent member TM.

Projection light emitted from the screen unit 23 includes projection light PL3 emitted from the emission surface ES2 of the second screen S2.

As in the case of the first embodiment, the transparent member TM and the air layer AL exist on the exit surface EL1 of the first screen S1 as media for propagating the projection light PL1 and the projection light PL2. 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 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 for the projection light PL2 than for 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 from which the projection light PL2 is emitted on the emission surface EL1 of the first screen S1. 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 the distance based on the apparent distance difference of 0.33T.

Therefore, the virtual image V2 formed by the projection light PL2 is formed closer to the viewpoint EY than the virtual image V1 formed by the projection light PL1. The shape of the virtual image V1 is based on the planar shape of the first screen S1 viewed from the direction along the optical axis AX, excluding the transparent member TM. Also, the shape of the virtual image V2 is 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 of Example 2, there is 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 shorter than the distance from the exit surface ES1 of the first screen S1 to the combiner.

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

According to the display device 20 of the second embodiment, as in the first embodiment, it is possible to form virtual images having two different depths on one screen. As a result, it is possible to form virtual images with more depth than the number of screens. Therefore, it is possible to reduce the number of screens required to form virtual images of a predetermined number of depths, and it is possible to achieve miniaturization and simplification of the structure of the apparatus.

Further, according to the display device 20 of the twentieth embodiment, it is difficult for the relative positional relationship between the first screen S1 and the second screen S2 to change due to an external force such as vibration. Therefore, even if vibrations or the like occur, the relative positional relationship between the formed virtual images V can be maintained, and high-quality virtual image display can be achieved.

The display device 30 of Example 3 of the present application will be described below with reference to FIGS. The display device 30 of Example 3 has the same configuration as that of the screen portion 13 of Example 1 except that the configuration of the screen portion 33 is different. Therefore, the configuration of the screen unit 33 and the virtual image formed will be mainly described below.

FIG. 5 is a side view showing an overview 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 section 33 includes two screens, a first screen S1 and a second screen S2. The first screen S1 and the second screen S2 are plate-like transmissive screens that can change state between a light transmitting state and a light scattering state.

As described above, for example, the first screen S1 and the second screen S2 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. It is possible to use a so-called functional liquid crystal film attached. Specific examples have been described in Examples 1 and 2, and are omitted here.

As in the display device 20 of the second embodiment, in the display device 30, one of the first screen S1 and the second screen S2 is placed in the scattering state and the other is placed in the light transmission state. and the second screen S2 to selectively scatter the illumination light EL.

FIG. 6 shows a perspective view of the screen portion 33. As shown in FIG. As shown in FIG. 6, the screen unit 33 has a structure in which a second screen S2 is arranged in the region of the screen S of the screen unit 13 of the display device 10 of the first embodiment on the incident surface IS (see FIG. 1) side. It's becoming

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 among the regions on the exit surface ES1 of the first screen S1. That is, the air layer AL exists in the area where the transparent member TM does not exist among the areas on the exit surface ES1.

In other words, on the exit surface ES1, a light-transmitting medium portion TP including a transparent member TM and an air layer AL, which are two light-transmitting media having different refractive indices, is provided as a medium for propagating light. Therefore, projection light emitted from the screen section 33 includes projection light PL1 emitted from the emission surface ES1 of the first screen S1 and propagating through the air layer AL and projection light PL2 propagating through the transparent member TM.

Projection light emitted from the screen section 33 includes projection light PL3 emitted from the emission surface ES2 of the second screen S2 and propagating through the air layer AL and projection light PL4 propagating through the transparent member TM.

As in the case of the first embodiment, the transparent member TM and the air layer AL exist on the exit surface EL1 of the first screen S1 as media for propagating the projection light PL1 and the projection light PL2. 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 projection light PL1 of the exit surface ES1. , and the area for emitting the projection light PL2. Specifically, the apparent distance to the concave surface 15S is shorter from the area of the exit surface ES1 from which the projection light PL2 is emitted than from the area of the exit surface ES1 from which the projection light PL1 is emitted.

More specifically, the apparent distance to the concave surface 15S of the combiner 15 is 1.0T- from the area of the exit surface ES1 from which the projection light PL1 exits rather than from the area from which the projection light PL1 exits from the exit surface ES1. 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 the distance based on the apparent distance difference of 0.33T.

Therefore, the virtual image V2 formed by the projection light PL2 is formed closer to the viewpoint EY than the virtual image V1 formed by the projection light PL1. The shape of the virtual image V1 is based on the planar shape of the first screen S1 viewed from the direction along the optical axis AX, excluding the transparent member TM. Also, the shape of the virtual image V2 is 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 of the third embodiment, there are projection light PL3 that is emitted from the emission surface ES2 of the second screen S2 and passes through the air layer AL and projection light PL4 that passes through the transparent member TM. do. The distance from the exit surface ES2 of the second screen S2 to the combiner 15 is shorter than the distance from the exit surface ES1 of the first screen S1 to the combiner 15.

Therefore, depending on the display device 30, the virtual images V3 and V4 are formed at positions 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 differs depending on the area 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 Example 3, as in Example 1, it is possible to form a virtual image having two different depths on one screen. As a result, it is possible to form virtual images with more depth than the number of screens. Therefore, it is possible to reduce the number of screens required to form virtual images of a predetermined number of depths, and it is possible to achieve miniaturization and simplification of the apparatus.

[Modification]
In the above embodiment, an example in which the translucent medium portion TP is formed by the transparent member TM and the air layer AL has been described. 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 portion 13 of the first embodiment, a second transparent member TM2 made of translucent solid material such as acrylic resin or glass may be used. That is, the translucent medium portion TP may be formed of 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 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 modification shown in FIG. 7, it is also possible to use a translucent solid material instead of the air layer AL of the second and third embodiments.

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

In the above embodiments, the screens S, S1 and S2 are assumed to be diffusion plates or functional liquid crystal films. However, the screens S, S1 and S2 may also be transmissive screens with microlenses or the like or holographic diffusers. For example, the screens S, S1 and S2 may be transmissive diffusion screens with liquid crystal microlenses or the like.

In the above embodiment, the light source 11 is a laser projector. However, the light source 11 may be 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 output surface S or S1 of the screen S or S1 or the shape of the transparent member TM is not limited to the positions illustrated in the above description. For example, by changing the position of the transparent member TM, it is possible to freely change the position and shape of the virtual image. Also, by changing the refractive index and thickness of the transparent member TM, it is possible to change the depth position of the virtual image.

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

10, 20, 30 display device 11 light source 13, 23, 33, 43 screen portion 15 combiner 15S concave surface S screen S1 first screen S2 second screen TP translucent medium portion TM transparent member AL air layer IS incident surface ES output surface

Claims (4)

one transmissive screen having one surface and capable of changing its state between a light transmitting state and a light scattering state;
disposed on the side of the one surface of the one transmissive screen, having a first surface facing the one surface of the one transmissive screen, and being in a state between a light transmission state and a light scattering state; other transmissive screens that can be changed,
one translucent member arranged only in one region on the first surface of the other transmissive screen or on the second surface opposite to the first surface;
a region other than the one region where the one translucent member is arranged on the first surface or the second surface of the other transmissive screen is exposed;
A display device, wherein the light transmitted through the one region is transmitted through the one transmission screen in a light scattering state or the other transmission screen in a light scattering state. 2. A display device according to claim 1, wherein said one translucent member is provided on said one surface of said one transmissive screen. 3. The display device according to claim 2, wherein the one translucent member is sandwiched between the one transmissive screen and the other transmissive screen. a light source that emits light in a predetermined irradiation direction;
A transmissive screen arranged in the irradiation direction, having a light incident surface for receiving the light and a light emitting surface for outputting the transmitted light, and capable of changing the state between a light transmitting state and a light scattering state. and,
a first surface disposed on the light emitting surface side of the one transmissive screen and facing the light emitting surface of the one transmissive screen, and in a state between a light transmitting state and a light scattering state; other transmissive screens that can be changed,
one translucent member arranged only in one region on the first surface of the other transmissive screen or on the second surface opposite to the first surface;
an optical member having a concave reflective surface provided in a region of the transmissive screen on the side of the light exit surface;
When the one light-transmitting member is arranged on the first surface, the light emitted from the other transmissive screen through the one region is the one transmissive screen in a light scattering state. Light transmitted through a screen or the other transmissive screen in a light scattering state,
When the one light-transmitting member is arranged on the second surface, the light emitted from the one light-transmitting member through the one region is transmitted through the one light-scattering state. A display device, characterized in that the light is transmitted through a type screen or the other transmissive screen in a light scattering state.

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