JP7331868B2 - Electronic mirror device - Google Patents

Description

The present invention relates to an electronic mirror device.

Patent Literature 1 discloses an electronic mirror for automobiles, in which a display element is arranged behind a concave mirror at a distance shorter than its focal length, and a virtual image is displayed behind the concave mirror. According to this, depth is given to the virtual image in the same manner as in the conventional mirror type, and the distance for switching the focus of the eye to the far distance can be reduced, making it easier to see the rearward and sideward images.

JP 2018-55075 A

This type of electronic mirror device can display an image of the surroundings of the vehicle using an image or a conventional image of the surroundings of the vehicle based on the reflection of external light from the surroundings of the vehicle. and can be switched. In Patent Document 1, as a switching method, a flat mirror is arranged on the back surface of the concave mirror, or the back surface of the concave mirror is used as a plane mirror, and the front and back sides are reversed. There is a problem in that it invites

The present disclosure has been made in view of the above circumstances, and an electronic device that enables switching between display of an image around the vehicle using an image and display of an image around the vehicle using reflection of light from the actual scenery with a simpler configuration. It is an object of the present invention to provide a mirror device.

In order to achieve the above object, an electronic mirror device according to the present disclosure includes a display device that emits display light indicating a captured image of the surroundings of a vehicle;
a concave mirror that reflects the display light emitted from the display;
a switching panel disposed between the display and the concave mirror so as to be positioned in the vicinity of the concave mirror and capable of switching between a transmissive state and a reflective state in response to application of a voltage;
Prepare.

According to the electronic mirror device according to the present disclosure, it is possible to switch between display of an image around the vehicle using an image and display of an image around the vehicle using reflection of light from the actual scenery with a simpler configuration.

1 is a schematic diagram of a vehicle equipped with an electronic mirror device according to an embodiment of the present disclosure; FIG. 2 is a block diagram showing functions of the electronic mirror device shown in FIG. 1; FIG. 2 is a schematic cross-sectional view showing a liquid crystal panel of the electronic mirror device shown in FIG. 1; FIG. It is a figure which shows the positional relationship of the concave mirror of the electronic mirror apparatus shown in FIG. 1, and a liquid crystal panel. 2 is a diagram showing a transmission state of the electronic mirror device shown in FIG. 1; FIG. 2 is a diagram showing a reflection state of the electronic mirror device shown in FIG. 1; FIG. 5B is a diagram showing the liquid crystal panel in the transmissive state shown in FIG. 5A; FIG. FIG. 5B shows the liquid crystal panel in the reflective state shown in FIG. 5B; FIG. 11 is a side view showing a display of an electronic mirror device according to another embodiment of the present disclosure;

Embodiments of the present disclosure will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a vehicle A equipped with an electronic mirror device 1 according to an embodiment of the present disclosure, and shows a state when the vehicle A is viewed from the right side. FIG. 2 is a block diagram showing functions of the electronic mirror device 1. As shown in FIG. Hereinafter, the front-back direction of the vehicle A in FIG. ), and the vertical direction is the Z direction (the upward direction is the +Z direction, and the downward direction is the −Z direction).

The electronic mirror device 1 is arranged in front of the vehicle interior of the vehicle A, and includes a liquid crystal panel 100 , a display device 200 and a concave mirror 300 . In addition to these, the electronic mirror device 1 includes a control section 400, a storage section 500, and an I/O interface 600 as functions thereof. The electronic mirror device 1 has a peripheral captured image viewing mode in which a user D, who is assumed to be a driver who is mainly seated in the driver's seat, visually recognizes a peripheral captured image obtained by capturing the periphery including the rear and sides of the vehicle A. , and a real scenery viewing mode that reflects the real scenery mainly behind and to the side of the vehicle A and allows the user to visually recognize the scenery.

The liquid crystal panel 100 is arranged together with a concave mirror 300 in the vicinity of the front windshield A1 in the passenger compartment of the vehicle A, and is arranged between the display 200 and the concave mirror 300 in the longitudinal direction of the vehicle A. In terms of the positional relationship with the user D, it can be said that the liquid crystal panel 100 is arranged between the user D and the concave mirror 300 . A liquid crystal panel 100 according to this embodiment is a twisted nematic (TN) type liquid crystal panel, and is configured as shown in a schematic sectional view in FIG. The liquid crystal panel 100 is an example of a switching panel of the present disclosure, and is configured to be switchable between a transmissive state and a reflective state according to voltage application under voltage application control of the control unit 400 . The transmissive state and reflective state of the liquid crystal panel 100 will be described in detail later.

In the following, to facilitate understanding of the explanation, the user D side (approximately the -X direction) of the liquid crystal panel 100 will be referred to as the "front side", and the opposite side (approximately the +X direction) will be referred to as the "back side". do. Also, in consideration of the visibility of the drawing, hatching indicating a cross section is omitted as appropriate in FIG. 3 .

The liquid crystal panel 100 includes a liquid crystal element 10, an absorptive polarizing plate 21 positioned on the front side of the liquid crystal element 10, and a reflective polarizing plate 22 positioned on the back side of the liquid crystal element 10, as shown in FIG. Although not shown, the liquid crystal panel 100 in plan view has, for example, a substantially rectangular shape.

The liquid crystal element 10 includes a first substrate 11, a second substrate 12, and a liquid crystal layer 13, as shown in FIG.

The first substrate 11 and the second substrate 12 are a pair of transparent substrates facing each other, and are made of glass, plastic, or the like, for example. The first substrate 11 and the second substrate 12 are arranged so as to face each other with the liquid crystal layer 13 interposed therebetween and such that their main surfaces (opposing surfaces) are parallel to each other. The first substrate 11 is positioned on the front side of the liquid crystal layer 13 .

A transparent electrode 11 a is provided on the liquid crystal layer 13 side of the first substrate 11 . A transparent electrode 12a is provided on the liquid crystal layer 13 side of the second substrate 12 . The transparent electrodes 11a and 12a are formed by known techniques such as sputtering, vapor deposition, and etching. In this embodiment, the transparent electrodes 11a and 12a are formed solidly on the corresponding substrate surface, and have a substantially rectangular shape in plan view. The transparent electrodes 11a and 12a are composed of an ITO (Indium Tin Oxide) film or the like containing indium oxide as a main component.

An insulating film and an alignment film (not shown) are formed on each of the first substrate 11 and the second substrate 12 . The insulating film is made of a silicon-based insulating film, and is formed so as to cover each of the transparent electrodes 11a and 12a from the liquid crystal layer 13 side. An alignment film is formed between the insulating film and the liquid crystal layer 13 . That is, the transparent electrode 11a, the insulating film, and the alignment film are laminated on the first substrate 11 . A transparent electrode 12 a , an insulating film, and an alignment film are laminated on the second substrate 12 .

The alignment film is in contact with the liquid crystal layer 13 and is for defining the alignment state of the liquid crystal molecules 13a (schematically shown in FIGS. 6A and 6B) included in the liquid crystal layer 13. (for example, flexographic printing). The alignment film is subjected to rubbing treatment. In this embodiment, the rubbing direction of the alignment film on the front side (that is, the alignment film formed on the first substrate 11) and the rubbing direction of the back side (that is, the alignment film formed on the second substrate 12) are They are substantially orthogonal (including exactly orthogonal) when viewed from the substrate normal direction (the normal direction of the opposed surfaces of the first substrate 11 and the second substrate 12). The orientation of the liquid crystal molecules 13a is regulated by the two orientation films subjected to the rubbing treatment. The alignment treatment applied to the alignment film is not limited to the rubbing treatment, and other known treatments such as photo-alignment treatment and protrusion alignment treatment may be used.

The liquid crystal layer 13 is formed by enclosing a liquid crystal material in a closed space formed by a sealing material (not shown) for joining the first substrate 11 and the second substrate 12 together with both substrates. The thickness (cell gap) of the liquid crystal layer 13 is defined by spacers (not shown) provided between the first substrate 11 and the second substrate 12 . The direction of the long axis of the liquid crystal molecules 13a of the liquid crystal layer 13 is twisted by 90° between the end of the liquid crystal layer 13 on the first substrate 11 side and the end on the second substrate 12 side due to the alignment control force of the alignment film ( The twist angle is 90°), and the orientation is such that it rotates (turns) little by little from one substrate side to the other substrate side (chiral structure). Thus, the liquid crystal layer 13 has chirality when no voltage is applied.

The absorptive polarizing plate 21 has a transmission axis (hereinafter also referred to as a first transmission axis) and an absorption axis orthogonal to the first transmission axis. The absorptive polarizing plate 21 transmits light polarized in a direction parallel to the first transmission axis among incident light.

The reflective polarizing plate 22 has a transmission axis (hereinafter also referred to as a second transmission axis) and a reflection axis perpendicular to the second transmission axis. Of the incident light, the reflective polarizing plate 22 transmits light polarized in a direction parallel to the second transmission axis and reflects light polarized in a direction parallel to the reflection axis.

In this embodiment, the first transmission axis of the absorptive polarizer 21 and the second transmission axis of the reflective polarizer 22 are substantially parallel (including exactly parallel) to each other when viewed from the substrate normal direction. , both polarizers are arranged (parallel Nicols arrangement). The rubbing direction of the alignment film on the front side (that is, the alignment film formed on the first substrate 11) and the direction along which the absorption axis of the absorptive polarizing plate 21 extends are set to be parallel.

The absorptive polarizing plate 21 is attached to the front surface of the first substrate 11 with a first transparent adhesive film 31 interposed therebetween. The reflective polarizing plate 22 is attached to the back surface of the second substrate 12 with a second transparent adhesive film 32 interposed therebetween. An optical element such as a retardation plate may be provided between the liquid crystal element 10 and each polarizing plate. In this case, the polarizing plate may be attached to the optical element positioned between the liquid crystal element 10 and the polarizing plate.

The first transparent adhesive film 31 and the second transparent adhesive film 32 are each made of, for example, an acrylic transparent adhesive (acrylic polymer) or the like. The first transparent adhesive film 31 is formed by applying a transparent adhesive to the surface of the absorptive polarizing plate 21 to be attached to the first substrate 11 . The second transparent adhesive film 32 is formed by applying a transparent adhesive to the surface of the reflective polarizing plate 22 to be attached to the second substrate 12 .

The display device 200 is arranged near the roof A2 in the passenger compartment of the vehicle A, and is positioned on the rear side (-X direction) and upper side (+Z direction) of the vehicle A from the liquid crystal panel 100 and the concave mirror 300. is. The display device 200 is a display device capable of displaying the peripheral captured image under the image display control of the control unit 400 and emitting display light L1 (see FIG. 5A) indicating the peripheral captured image toward the concave mirror 300. be. Specifically, a TFT (Thin Film Transistor) liquid crystal display and an organic EL (Electro-Luminescence) display can be used. Also, the display device 200 may be a projector.

The concave mirror 300 is arranged with the liquid crystal panel 100 in the vicinity of the front windshield A1 in the passenger compartment of the vehicle A, and is arranged on the front side of the vehicle A (+X direction) relative to the liquid crystal panel 100 and the display 200 . The liquid crystal panel 100 and the concave mirror 300 are housed in a common case (housing) (not shown). FIG. 4 shows the positional relationship in the longitudinal direction (X direction) of the vehicle A between the liquid crystal panel 100 and the concave mirror 300 . The liquid crystal panel 100 is tilted more downward (-Z direction) than the concave mirror 300 is. That is, the first horizontal length DS1 between the upper end 110 of the liquid crystal panel 100 and the upper end 310 of the concave mirror 300 is the second horizontal length between the lower end 120 of the liquid crystal panel 100 and the lower end 320 of the concave mirror 300 . is greater than DS2 (DS1>DS2). The reason why the liquid crystal panel 100 and the concave mirror 300 are arranged in such a positional relationship will be described later.

The control unit 400 includes one or more arithmetic processing circuits such as microcomputers, peripheral circuits, and programs. More specifically, the control unit 400 includes a CPU that actually performs processing (control of the entire electronic mirror device 1, etc.) executed by the control unit 400 as hardware, a RAM that functions as a main memory of the CPU, and a control unit. A ROM that stores various programs that cause the 400 to execute processing described later, various converters that convert information (signals) input to and output from the control unit 400 to digital for the CPU and analog for output, Prepare. In addition to the CPU, the control unit 400 may include various dedicated circuits (for example, an image processing circuit, etc.) for executing part of the processing performed by the control unit 400 instead of the CPU. In addition, the control unit 400 includes a program for performing processing executed by the control unit 400 as software.

The storage unit 500 stores programs used when the control unit 400 executes processing, data used for the processing, and the like. The storage unit 500 includes a rewritable nonvolatile storage medium such as a flash memory. The storage unit 500 may include an easily attachable/detachable device such as a memory card.

The I/O interface 600 is a hardware interface for inputting/outputting information between the operating unit 2, the imaging unit 3, and other devices in the vehicle A via wired or wireless connection. and a software interface. Through communication, the I/O interface 600 acquires various information such as the switching operation between the transmission state and the reflection state of the electronic mirror device 1 from the operation unit 2 and the peripheral captured image from the imaging unit 3, and transmits the information to the control unit 400. do. The operation unit 2 is, for example, a push button switch or a touch panel, and receives the operation of the user D. The operation unit 2 may be capable of operating various devices in the vehicle A including the electronic mirror device 1 , or may operate the electronic mirror device 1 exclusively. The imaging unit 3 is a camera provided in the interior of the vehicle A and/or in the vehicle body of the vehicle A, and images the surroundings including the rear and sides of the vehicle A to obtain the surroundings captured image.

The electronic mirror device 1 is configured as described above.

Next, switching between the peripheral captured image visual recognition mode and the real scenery visual recognition mode of the electronic mirror device 1 and switching between the transmissive state and the reflective state of the liquid crystal panel 100 for executing the switching between these modes is shown in FIG. 5A. , 5B, 6A, and 6B. FIG. 5A shows the electronic mirror device 1 in the peripheral captured image viewing mode, and FIG. 5B shows the electronic mirror device 1 in the real scenery viewing mode. 6A shows the liquid crystal panel 100 in a transmissive state, and FIG. 6B shows the liquid crystal panel 100 in a reflective state. In addition, in FIGS. 6A and 6B, hatching indicating a cross section is omitted as appropriate, and appropriate members are omitted.

(Peripheral captured image viewing mode)
In the peripheral captured image viewing mode shown in FIG. 5A, the display device 200 displays the peripheral captured image under the image display control of the control unit 400, and directs the display light L1 indicating the peripheral captured image toward the concave mirror 300. (approximately in the +X direction).
Display light L<b>1 emitted from the display device 200 reaches the liquid crystal panel 100 . At this time, the liquid crystal panel 100 is brought into a transmissive state under the voltage application control of the control section 400 . The liquid crystal panel 100 transmits the display light L1 of the display 200 in the transmissive state. The display light L1 transmitted through the liquid crystal panel 100 reaches the concave mirror 300, is magnified by the concave mirror 300, and is reflected. The display light L1 reflected by the concave mirror 300 passes through the liquid crystal panel 100 again and reaches the eyebox EB. The eye box EB is an area in the vertical and horizontal directions (YZ plane) set as the range of the viewpoint position of the user D seated in the driver's seat. As a result, the user D can view the peripheral captured image as a virtual image V with a depth (approximately located far in the +X direction) by placing his or her viewpoint within the eye box EB in the peripheral captured image viewing mode. can be viewed as According to this, the user D can easily adjust the focus of the eyes even when the line of sight is shifted from a distant view such as the scenery in front of the vehicle A to the peripheral captured image (virtual image V).

(transmissive state of liquid crystal panel)
Here, the transmissive state of the liquid crystal panel 100 will be described in detail with reference to FIG. 6A. When the drive voltage is applied, the liquid crystal molecules 13a of the liquid crystal panel 100 are oriented along the voltage application direction (substrate normal direction) and lose their chirality. In this state, when the display light L1 enters the liquid crystal panel 100 from the front side (approximately in the −X direction), it is transmitted through the absorption polarizing plate 21 and becomes linearly polarized light parallel to the first transmission axis, but is transmitted through the liquid crystal layer 13. However, since the polarization direction is not converted, the light is also transmitted through the reflective polarizing plate 22 having the second transmission axis parallel to the first transmission axis. Thus, the liquid crystal panel 100 transmits the display light L1. The display light L1 reflected by the concave mirror 300 is again transmitted through the reflective polarizing plate 22, the liquid crystal layer 13, and the absorptive polarizing plate 21, so that the user D can see through the virtual image V of the captured peripheral image reflected by the concave mirror 300. .

When external light enters the liquid crystal panel 100 from the front side, it is transmitted through the absorption polarizing plate 21 and transmitted through the liquid crystal layer 13 as linearly polarized light parallel to the first transmission axis. The light is transmitted through the reflective polarizing plate 22 having two transmission axes and reflected by the concave mirror 300 . However, since the reflecting surface shape and installation angle of the concave mirror 300 are designed to reflect the display light L1 from the display 200 toward the eye box EB of the user D, most of the external light incident on the concave mirror 300 is does not reach the eye box EB of the user D, and hardly deteriorates the visibility of the peripheral captured image.

(Real scenery viewing mode)
In the real scenery visual recognition mode shown in FIG. 5B , the light L2 from the real scenery behind or to the side of the vehicle A reaches the liquid crystal panel 100 . At this time, the liquid crystal panel 100 is brought into the reflective state under the voltage application control of the controller 400 . In the reflective state, the liquid crystal panel 100 reflects light L2 from the actual scenery. Light L2 from the actual scenery reflected by the liquid crystal panel 100 reaches the eyebox EB. As a result, in the real scenery visual recognition mode, the user D can visually recognize the real scenery as a virtual image with depth by placing his/her viewpoint position within the eye box EB.

(Reflection state of liquid crystal panel)
Here, the reflection state of the liquid crystal panel 100 will be described in detail with reference to FIG. 6B. When no driving voltage is applied, the liquid crystal molecules 13a of the liquid crystal panel 100 are substantially parallel to the substrate surface, and the liquid crystal layer 13 still has chirality. In this state, when the light L2 from the actual scene is incident from the front side of the liquid crystal panel 100, it is transmitted through the absorptive polarizing plate 21 and becomes linearly polarized light parallel to the first transmission axis. 90° polarization direction is converted by the chirality of , and becomes linearly polarized light along the reflection axis of the reflective polarizing plate 22 , so it is reflected by the reflective polarizing plate 22 . This reflected light is transmitted through the liquid crystal layer 13 and the polarization direction is changed by 90° again, so it is transmitted through the absorptive polarizing plate 21 . Thus, the liquid crystal panel 100 functions as a mirror in the reflective state. A portion of the liquid crystal panel 100 in the reflective state that functions as a mirror is hereinafter referred to as an active area.

In the real-scene viewing mode, the display device 200 is basically in a non-display state. When the light becomes parallel linearly polarized light and passes through the liquid crystal layer 13 , the polarization direction is changed by 90° to become linearly polarized light along the reflection axis of the reflective polarizing plate 22 , so that it is reflected by the reflective polarizing plate 22 . However, since the installation angle of the liquid crystal panel 100 is designed to reflect the light L2 from the actual scene toward the eye box EB of the user D, the display light L1 reflected by the liquid crystal panel 100 is It does not reach the eye box EB and does not reduce the visibility of the real scenery.

As described above, the electronic mirror device 1 arranges the concave mirror 300 so that the display light L1 of the display 200 arranged near the roof A2 of the vehicle A is reflected by the eye box EB, and the liquid crystal panel 100 is moved from the display 200. is arranged so that the light L2 from the actual scenery below is reflected on the eye box EB. As a result, as shown in FIG. 4, the first horizontal length DS1 between the top edge 110 of the liquid crystal panel 100 and the top edge 310 of the concave mirror 300 is equal to the bottom edge 120 of the liquid crystal panel 100 and the bottom edge 320 of the concave mirror 300. is greater than a second horizontal length DS2 between (DS1>DS2).

As described above, the electronic mirror device 1 does not require a complicated switching mechanism such as a rotating mechanism. It is possible to switch between display of an image of the surroundings (the peripheral captured image viewing mode) and display of an image of the vehicle's surroundings by reflection of light from the actual scenery (the actual scenery viewing mode).

It should be noted that the scope of the present disclosure is not limited by the above embodiments and drawings. Of course, changes (including deletion of components) can be added to these.

In addition, although the liquid crystal panel 100 is used as an example of the switching panel of the present disclosure, the switching panel is not limited to this, and any switchable panel may be used as long as it can switch between a transmissive state and a reflective state depending on the state of voltage application. Another example may be an EC panel using an electrochromic (EC) material.

In another embodiment of the present disclosure, the liquid crystal panel 100 is used as the switching panel, and linearly polarized light parallel to the first transmission axis of the absorptive polarizing plate 21 may be emitted as the display light L1 of the display 200. . Furthermore, in another embodiment of the present disclosure, the first transmission axis of the absorptive polarizing plate 21 is set in the vertical direction so that the liquid crystal panel 100 transmits linearly polarized light in the vertical direction in the transmission state, and the display device 200 As the display light L1, vertically linearly polarized light may be emitted. According to this, even when the user D is wearing polarized glasses that mainly block horizontal linearly polarized light, the peripheral captured image is not obstructed.

Further, as described above, in the peripheral captured image viewing mode, most of the external light does not reach the eye box EB even if it is reflected by the concave mirror 300, but the external light passing through the periphery of the display 200 is reflected by the concave mirror 300. and reach the eyebox EB. On the other hand, according to another embodiment of the present disclosure, as shown in FIG. 7, light is emitted from the rear of the vehicle A (approximately in the −X direction) so as to surround the emitting portion 210 that emits the display light L1 of the display 200. A light blocking portion 220 that blocks the light L3 may be provided. In FIG. 7, the light shielding part 220 is made of, for example, a brim-shaped member made of a black resin material or a metal material, but the shape and the like are not limited to this. According to this, it is possible to further enhance the visibility of the peripheral captured image.

In the above description, the liquid crystal panel 100 sets the first transmission axis of the absorptive polarizing plate 21 and the second transmission axis of the reflective polarizing plate 22 parallel to each other, and reflects light when no driving voltage is applied. Although an example (normally reflecting state) in which the state is changed to a transmissive state when a driving voltage is applied has been shown, the present invention is not limited to this. In the liquid crystal panel 100, the first transmission axis of the absorptive polarizing plate 21 and the second transmission axis of the reflective polarizing plate 22 are set substantially perpendicular to each other, and the liquid crystal panel 100 is in a reflective state when the driving voltage is applied. The liquid crystal panel 100 may be configured so as to be in a transmissive state (normally transmissive). In the example of normal transmission, the liquid crystal panel 100 can be switched between the reflective state and the transmissive state as follows.

(transmissive state of liquid crystal panel)
When no driving voltage is applied, the liquid crystal molecules 13a of the liquid crystal panel 100 are substantially parallel to the substrate surface, and the liquid crystal layer 13 still has chirality. In this state, when the display light L1 is incident from the front side of the liquid crystal panel 100, it is transmitted through the absorptive polarizing plate 21 and becomes linearly polarized light parallel to the first transmission axis. The light is polarized by 90° and transmitted through the reflective polarizer 22 having a second transmission axis substantially perpendicular to the first transmission axis. Thus, the liquid crystal panel 100 transmits the display light L1.

(Reflection state of liquid crystal panel)
When the drive voltage is applied, the liquid crystal molecules 13a of the liquid crystal panel 100 are oriented along the voltage application direction (substrate normal direction) and lose their chirality. In this state, when the light L2 from the actual scene is incident from the front side of the liquid crystal panel 100, it is transmitted through the absorptive polarizing plate 21 and transmitted through the liquid crystal layer 13 as linearly polarized light parallel to the first transmission axis. It becomes linearly polarized light along the reflection axis of the reflective polarizing plate 22 parallel to the transmission axis, and is reflected by the reflective polarizing plate 22 . This reflected light passes through the liquid crystal layer 13 again as it is, and passes through the absorptive polarizing plate 21 having a first transmission axis substantially perpendicular to the reflection axis. Thus, the liquid crystal panel 100 functions as a mirror in the reflective state.

Further, according to another embodiment of the present disclosure, the active area of the liquid crystal panel 100 may be divided into a plurality of areas, and switching between the transmissive state and the reflective state may be possible for each divided area. For example, two divided areas on the left and right may be provided, one of which may be in a reflective state for the real scenery visual recognition mode, and the other may be in a transmissive state for the peripheral captured image visual recognition mode. Also, at this time, an image such as vehicle information may be appropriately displayed on the display 200 in addition to the peripheral captured image. Moreover, in order to divide the active area of the liquid crystal panel 100 into a plurality of areas, at least one of the transparent electrodes 11a and 12a is divided for each divided area. At this time, the application of the voltage to the liquid crystal layer 13 via the transparent electrodes 11a and 12a may be either passive or active.

In the above description, the liquid crystal element 10 is a TN-type liquid crystal having a twist angle of 90°, but the present invention is not limited to this. The twist angle may be less than 90° or greater than 90° as long as the above-described reflective state and transmissive state can be realized in response to the application of a voltage to the liquid crystal layer 13 . For example, the liquid crystal element 10 may be of the STN (Super Twisted Nematic) type. Further, if the reflective state and the transmissive state can be realized according to the application of voltage to the liquid crystal layer 13, the first transmission axis of the absorptive polarizer 21 and the second transmission axis of the reflective polarizer 22 are , may not be in a parallel or orthogonal relationship, and the optic axis and the rubbing direction of the alignment film may not be in a parallel or orthogonal relationship. It is also possible to appropriately shift each optical axis in consideration of the viewing angle characteristics in the transmissive state and the reflection characteristics in the reflective state.

In the above description, descriptions of well-known technical matters are omitted as appropriate in order to facilitate understanding of the present invention.

1... Electronic mirror device 100... Liquid crystal panel (switching panel)
200... Display 300... Concave mirror 400... Control unit 500... Storage unit 600... I/O interface A... Vehicle L1... Display light L2... Light from a real scene

Claims (3)

a display device (200) that emits display light (L1) indicating a captured image of the surroundings of the vehicle (A);
a concave mirror (300) that reflects the display light (L1) emitted from the display (200);
A switching panel (a switching panel ( 100) and
An electronic mirror device comprising: A first length (DS1) between the top edge (310) of the concave mirror (300) and the top edge (110) of the switching panel (100) is the bottom edge (320) of the concave mirror (300) and the switching panel. Electronic mirror device according to claim 1, wherein the second length (DS2) between the lower end (120) of (100) is greater than the second length (DS2). The switching panel (100) is a liquid crystal panel (100) that transmits vertically polarized light in the transmission state,
2. The electronic mirror device according to claim 1, wherein the display (200) emits the vertically polarized light as the display light (L1).

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