JP7272294B2 - Display device - Google Patents

Description

The present disclosure relates to display devices.

2. Description of the Related Art A display device is known that includes a screen that projects an image, and a protective member that surrounds the screen and is provided with a dihedral corner reflector that forms an image to the outside (see, for example, Patent Document 1).

JP 2019-139023 A

If the image displayed by the display device can be changed, the display device can be applied to various uses. Therefore, one object is to provide a display device capable of changing a displayed image.

A display device according to the present disclosure includes a laser diode, a diffraction element arranged on an optical path of a laser beam emitted from the laser diode and diffracting the laser beam to convert it into a diffraction image, and an optical axis of the laser beam. a driving section for moving the diffraction element in a plane perpendicular to the plane, a screen for projecting a diffraction image, a laser diode, the diffraction element, the driving section, and the screen, and surrounding the protective member having an opening; and a reflecting member that is installed and reflects the diffraction image projected on the screen to project the diffraction image to the outside of the protective member.

According to the display device of the present disclosure, it is possible to change the displayed image.

FIG. 1 is a schematic perspective view showing the structure of a display device according to one embodiment of the present disclosure. FIG. 2 is a block diagram showing the configuration of the display device according to one embodiment of the present disclosure. FIG. 3 is a schematic perspective view showing the structure of the display device with the lid removed. FIG. 4 is a schematic perspective view showing the structure of the display device with the lid removed. FIG. 5 is a schematic perspective view showing the structure of an optical module. FIG. 6 is a schematic perspective view showing the structure of the optical module with the cap removed. FIG. 7 is a schematic cross-sectional view showing the structure of a diffraction element. FIG. 8 is a schematic diagram showing a state in which laser light is converted into a diffraction image by a diffraction element. FIG. 9 is a schematic perspective view showing the structure of the reflecting member. FIG. 10 is a schematic diagram showing the structure of an optical module. FIG. 11 is a schematic plan view showing the structure of the display device with the lid removed. FIG. 12 is a schematic cross-sectional view showing the structure of the display device according to one embodiment of the present disclosure.

[Description of Embodiments of the Present Disclosure]
First, the embodiments of the present disclosure are listed and described. The display device of the present disclosure includes a laser diode, a diffraction element arranged on an optical path of a laser beam emitted from the laser diode and diffracting the laser beam to convert it into a diffraction image, and a laser beam perpendicular to the optical axis of the laser beam. a driving section for moving the diffraction element in a flat plane; a screen for projecting a diffraction image; a protective member surrounding the laser diode, the diffraction element, the driving section, and the screen; and a reflecting member for projecting the diffraction image to the outside of the protective member by reflecting the diffraction image projected on the screen.

A display device of the present disclosure includes a diffraction element and a driving section that moves the diffraction element within a plane perpendicular to the optical axis of laser light. By moving the diffraction element in a plane perpendicular to the optical axis of the laser beam by the drive section, the area and direction of the diffraction element where the light is incident can be changed, and the diffraction image projected on the screen can be changed. Therefore, it is possible to change the diffraction image projected on the outside of the protective member. Therefore, according to the display device of the present disclosure, it is possible to change the displayed image.

The display device may further include a receiving section that receives information, and a control section that controls the driving section based on the information received by the receiving section. By adopting such a configuration, it is possible to control the driving section and change the image displayed by the display device based on the information received by the receiving section.

The display device reflects the diffraction image projected on the screen toward the reflecting member, and the incident angle of the diffraction image incident on the reflecting member is larger than the incident angle of the diffraction image directly incident on the reflecting member from the screen. It may further comprise a first mirror installed as follows. A protective member may surround the laser diode, the diffraction element, the driving section, the screen, and the first mirror. Here, the incident angle of the diffraction image means the incident angle of the light forming the diffraction image. By adopting such a configuration, it is possible to increase the incident angle of the diffraction image incident on the reflecting member and project the diffraction image at a greater distance from the display device. Therefore, it is possible to make the image displayed on the display device easier to see.

The display device may further include a second mirror that reflects the laser light so as to form an optical path of the laser light converted into the diffraction image by the diffraction element from the diffraction element to the screen. A protective member may surround the laser diode, the diffraction element, the drive section, the screen, and the second mirror. By adopting such a configuration, the length of the optical path of the laser light converted into the diffraction image by the diffraction element can be made longer than when the laser light is directly incident on the screen from the diffraction element. Therefore, the image displayed from the display device can be enlarged.

The display device may further include a plurality of laser diodes, and a filter that multiplexes the laser beams emitted from the plurality of laser diodes and emits the combined laser beams toward the diffraction element. By adopting such a configuration, laser beams emitted from a plurality of laser diodes can be multiplexed by the filter, and the multiplexed laser beams can be made incident on the diffraction element.

In the above display device, the plurality of laser diodes may include a red laser diode that emits red laser light, a green laser diode that emits green laser light, and a blue laser diode that emits blue laser light. good. With such a configuration, light of a desired color can be formed and made incident on the diffraction element.

[Details of the embodiment of the present disclosure]
Next, embodiments of the display device according to the present disclosure will be described with reference to the drawings. In the following drawings, the same or corresponding parts are given the same reference numerals, and the description thereof will not be repeated.

FIG. 1 is a schematic perspective view showing the structure of a display device according to this embodiment. FIG. 2 is a block diagram showing the configuration of the display device according to this embodiment. FIG. 3 is a schematic perspective view showing the structure of the display device with the cover of FIG. 1 removed. 4 is a perspective view corresponding to the state in which the lid is removed in FIG. 1 and viewed from a viewpoint different from that in FIG. 3. FIG. FIG. 5 is a schematic perspective view showing the structure of an optical module. FIG. 6 is a schematic perspective view showing the structure of the optical module with the cap of FIG. 5 removed. FIG. 7 is a schematic cross-sectional view showing the structure of a diffraction element. FIG. 8 is a schematic diagram showing a state in which laser light is converted into a diffraction image by a diffraction element. FIG. 9 is a schematic perspective view showing the structure of the reflecting member. FIG. 10 is a schematic diagram in the XZ plane showing the cap in cross section and the other parts in plan view. FIG. 11 is a schematic plan view showing the structure of the display device with the lid removed. FIG. 12 is a schematic cross-sectional view showing the structure of the display device in this embodiment. FIG. 12 is a cross-sectional view showing a state in which the display device is cut along AA in FIG.

1, 3 and 4, display device 1 in the present embodiment includes optical module 10, diffraction element 21, holding member 22, drive unit 31, mirror 61 as a first mirror, and , mirrors 62 , 63 , 64 , 65 as second mirrors, screen 40 , and protective member 50 . The protective member 50 surrounds the optical module 10 , the diffraction element 21 , the holding member 22 , the driving section 31 , the mirrors 61 , 62 , 63 , 64 and 65 and the screen 40 .

Protective member 50 includes a lid 51 and a case 52 . An internal space U surrounded by a lid 51 and a case 52 is formed in the protective member 50 . The internal space U is partitioned into a first recess 53 and a second recess 54 by an inner wall portion 541 . The case 52 has a planar bottom wall surface 531 that defines the first recess 53 . The case 52 is formed with grooves 551, 552, 553 so as to surround the internal space U. As shown in FIG. The first groove 551 extends along the X-axis direction. The second groove 552 extends along the Y-axis direction. The third groove 553 extends along the X-axis direction. A battery 70 and a substrate 46 are housed in the second recess 54 .

Lid 51 has a rectangular parallelepiped shape. The lid 51 has a rectangular shape when viewed from the Z-axis direction. The lid 51 is formed with an opening 51A. The opening 51A has a rectangular shape when viewed from the Z-axis direction. A pair of long sides of the opening 51</b>A are formed along the long sides of the lid 51 when viewed from the Z-axis direction. The opening 51A is formed so as to be in contact with one short side of the lid 51 when viewed from the Z-axis direction.

Referring to FIGS. 3 and 4, optical module 10 is fixed on bottom wall surface 531 . 5 and 6, optical module 10 includes a disk-shaped base body 110, a light forming portion 120 arranged on one main surface 110A of base body 110 to form light, a light A cap 140 arranged in contact with one main surface 110A of the base body 110 so as to cover the forming portion 120, and a plurality of lead pins 151 protruding on both sides of the one main surface 110A side and the other main surface 110B side. and The base body 110 and the cap 140 are welded by, for example, YAG (Yittrium Aluminum Garnet) laser welding, resistance welding, or the like to be hermetically sealed. That is, the light forming portion 120 is hermetically sealed between the base body 110 and the cap 140 .

A space surrounded by base body 110 and cap 140 is filled with gas from which moisture is reduced (removed), such as dry air or dry nitrogen. The cap 140 is formed with an emission window 141 which is a through hole through which the light from the light forming section 120 is transmitted. A transmission member 142 is installed in the exit window 141 .

Referring to FIG. 6, light forming portion 120 includes a base block 160 having a semi-cylindrical shape. The base block 160 has a rectangular mounting surface 160A. The base block 160 is fixed to one main surface 110A of the base body 110 at its semicircular bottom surface. 160 A of mounting surfaces are arrange|positioned perpendicular|vertically so that 110 A of one main surfaces of the base body 110 may be cross|intersected. One principal surface 110A and the other principal surface 110B of base body 110 extend along the YZ plane. The mounting surface 160A is along the XZ plane.

Referring to FIG. 6, a flat first submount 171 is arranged on mounting surface 160A. A first laser diode 181 is arranged on the first submount 171 . The first laser diode 181 emits red laser light. First submount 171 and first laser diode 181 are arranged such that laser light emitted from first laser diode 181 is emitted along one side of mounting surface 160A.

A flat second submount 172 is arranged on the mounting surface 160A. A second laser diode 182 is arranged on the second submount 172 . The second laser diode 182 emits green laser light. The second submount 172 and the second laser diode 182 are arranged so that the laser light emitted from the second laser diode 182 is emitted along the other side that intersects the one side of the mounting surface 160A. . The second submount 172 and the second laser diode 182 emit laser light emitted from the second laser diode 182 in a direction that intersects (perpendicular to) the laser light emitted from the first laser diode 181. are arranged as follows.

A flat third submount 173 is arranged on the mounting surface 160A. A third laser diode 183 is arranged on the third submount 173 . The third laser diode 183 emits blue laser light. Third submount 173 and third laser diode 183 are arranged such that laser light emitted from third laser diode 183 is emitted along the other side of mounting surface 160A. The third submount 173 and the third laser diode 183 are arranged so that the laser light emitted from the third laser diode 183 is emitted in a direction intersecting (perpendicular to) the light from the first laser diode 181. be done. The third submount 173 and the third laser diode 183 allow the laser light emitted from the third laser diode 183 to be directed in the direction along the laser light emitted from the second laser diode 182 (the laser light emitted from the second laser diode 182 parallel to the laser beam).

The height of the optical axis of the first laser diode 181, the second laser diode 182, and the third laser diode 183 (the distance between the reference plane and the optical axis when the mounting surface 160A is used as the reference plane; ) are adjusted and matched by the first submount 171 , the second submount 172 and the third submount 173 . The first laser diode 181 emits laser light in the Z direction. The second laser diode 182 and the third laser diode 183 emit laser light in the X direction. The emission direction of the laser light from the first laser diode 181 intersects with the emission directions of the laser light from the second laser diode 182 and the third laser diode 183 . More specifically, the emission direction of the laser light from the first laser diode 181 is perpendicular to the emission direction of the laser light from the second laser diode 182 and the third laser diode 183 . The main surface of the third submount 173, which is the mounting surface of the third laser diode 183; the main surface of the second submount 172, which is the mounting surface of the second laser diode 182; The major surfaces of submount 171 are parallel to each other.

A first filter 191 is arranged in a region on the mounting surface 160A corresponding to a position where the laser light emitted from the first laser diode 181 and the laser light emitted from the second laser diode 182 intersect. A second filter 192 is arranged in a region on the mounting surface 160A corresponding to a position where the laser light emitted from the first laser diode 181 and the laser light emitted from the third laser diode 183 intersect. The first filter 191 and the second filter 192 each have a plate-like shape with main surfaces parallel to each other. The first filter 191 and the second filter 192 are, for example, wavelength selective filters. The first filter 191 and the second filter 192 are dielectric multilayer filters.

The first filter 191 transmits red laser light and reflects green laser light. The second filter 192 transmits red laser light and green laser light and reflects blue laser light. Thus, the first filter 191 and the second filter 192 selectively transmit and reflect light of specific wavelengths. As a result, the first filter 191 and the second filter 192 combine the laser beams emitted from the first laser diode 181, the second laser diode 182 and the third laser diode 183, respectively.

The main surfaces of the first filter 191 and the second filter 192 are inclined with respect to the Z direction and the X direction. More specifically, the main surfaces of the first filter 191 and the second filter 192 are aligned in the X direction (the emission direction of the first laser diode 181) and the X direction (the emission direction of the second laser diode 182 and the third laser diode 183). ) at an angle of 45°.

Referring to FIGS. 3 and 4, holding member 22 is fixed on bottom wall surface 531 . The holding member 22 is rotatably held by the support member 59 . The holding member 22 includes a pair of discs having through holes and a hollow cylindrical connection portion (not shown) that connects the discs. A diffraction element 21 is arranged to cover the through hole in one disk of the holding member 22 . A first gear 22A is formed on the outer peripheral surface of the other disc of the holding member 22 . The drive unit 31 has a second gear 31A. The central axis of the motor (not shown) of the driving section 31 and the rotation axis of the second gear 31A are aligned. The first gear 22A and the second gear 31A are in mesh.

The diffraction element 21 is fixed to the holding member 22 . The diffraction element 21 has a disk-like shape. The diffraction element 21 is arranged along the YZ plane. By driving the drive unit 31, the diffraction element 21 can be rotated within the YZ plane. Referring to FIG. 7, diffraction element 21 includes an incident surface 21A on which the laser beams emitted from laser diodes 181, 182 and 183 are incident, and an emitting surface 21B on the side opposite to incident surface 21A in the thickness direction. . A specific pattern is formed on the exit surface 21B. Referring to FIG. 8, diffraction element 21 is positioned so that center W of diffraction element 21 coincides with optical axis V of laser light emitted from laser diodes 181, 182, and 183 when viewed from the X-axis direction. placed. In this embodiment, the rotation axis of the first gear 22A coincides with the optical axis V of the laser beams emitted from the laser diodes 181, 182, and 183. As shown in FIG. The diffraction element 21 rotates around the optical axis V within a virtual plane T perpendicular to the optical axis V of the laser beams emitted from the laser diodes 181 , 182 and 183 . The laser beams emitted from the laser diodes 181, 182, and 183 are converted by the diffraction element 21 into a diffraction image S ₁ (a diffraction image indicated by an arrow in this embodiment). By rotating the diffraction element 21 around the optical axis V, the diffraction image _S1 can be rotated.

Referring to FIGS. 3, 4 and 11, mirror 62 is arranged at a connecting portion where first groove 551 and second groove 552 are connected. The mirror 63 is arranged at the connecting portion where the second groove 552 and the third groove 553 are connected. The mirror 64 is arranged at the end of the third groove 553 opposite to the side where the mirror 63 is arranged. The mirror 65 is arranged between the driver 31 and the mirror 64 in the Y-axis direction. The mirrors 62, 63, 64, 65 have a plate-like shape. Mirrors 62, 63, 64 and 65 have reflective surfaces 62A, 63A, 64A and 65A, respectively. Reflective surfaces 62A, 63A, 64A, and 65A are each inclined at 45° with respect to the X-axis direction. A flat screen 40 is fixed on the bottom wall surface 531 . The screen 40 is arranged along the YZ plane. The mirror 65 and the screen 40 are arranged side by side in the X-axis direction. Mirrors 62, 63, 64, 65 reflect the laser light so as to form optical paths _L6 , _L7 , _L8 , _L9 , _L10 of the laser light converted into diffraction image _S1 . As a result, a diffraction image S ₁ is projected on the screen 40 .

3 and 4, flat mirror 61 is fixed on bottom wall surface 531. As shown in FIG. The mirror 61 has a reflecting surface 61A. The reflective surface 61A is arranged along the XY plane. The mirror 61 reflects the diffraction image _S1 projected on the screen 40 toward a reflecting member 41 (see FIG. 1), which will be described later.

Referring to FIGS. 1 and 9, reflecting member 41 is arranged to block opening 51A of lid 51 . The reflecting member 41 includes a plurality of reflecting portions 42 arranged in a matrix at equal intervals within the XY plane. The reflecting portion 42 includes a first reflecting surface 42A and a second reflecting surface 42B. The first reflecting surface 42A and the second reflecting surface 42B intersect (perpendicularly in the present embodiment).

2 and 3, display device 1 further includes a receiver 44 arranged on substrate 46 and a controller 45 . The receiving unit 44 receives information. The control section 45 controls the rotation of the driving section 31 based on the information received by the receiving section 44 . An electrical configuration of the display device 1 according to the present embodiment will be described. Referring to FIG. 2, in the present embodiment, reception unit 44 receives information from mobile terminal 80, for example. The receiver 44 and the controller 45 are electrically connected. Drive unit 31 and control unit 45 are electrically connected. The optical module 10 and the controller 45 are electrically connected. In this embodiment, the light emitted from the optical module 10 is adjusted to a desired color based on the information received by the receiver 44 .

Next, the operation of the display device 1 according to this embodiment will be described. Referring to FIG. 10 , the red laser light emitted from first laser diode 181 travels along optical path L ₁ and enters first filter 191 . Since the first filter 191 transmits the red laser light, the laser light emitted from the first laser diode 181 further travels along the optical path _L2 and enters the second filter 192 . Since the second filter 192 transmits the red laser light, the laser light emitted from the first laser diode 181 further travels along the optical path _L3 , and passes through the transmission member disposed in the emission window 141 of the cap 140. 142 and exits toward the diffraction element 21 .

A green laser beam emitted from the second laser diode 182 travels along the optical path L ₄ and enters the first filter 191 . Since the first filter 191 reflects the green laser light, the laser light emitted from the second laser diode 182 joins the optical path _L2 . As a result, the green laser light is coaxially multiplexed with the red laser light, travels along the optical path _L2 , and enters the second filter 192 . Since the second filter 192 transmits the green laser light, the laser light emitted from the second laser diode 182 further travels along the optical path _L3 and passes through the transmission member disposed in the emission window 141 of the cap 140. 142 and exits toward the diffraction element 21 .

A blue laser beam emitted from the third laser diode 183 travels along the optical path _L5 and enters the second filter 192 . Since the second filter 192 reflects the blue laser light, the laser light emitted from the third laser diode 183 joins the optical path _L3 . As a result, the blue laser light is combined with the red laser light and the green laser light, travels along the optical path _L3 , passes through the transmission member 142 disposed in the exit window 141 of the cap 140, and reaches the diffraction element 21. emit toward

10 and 11 , a laser beam formed by combining red, green and blue laser beams is emitted from transmission member 142 of cap 140 toward diffraction element 21 . Referring to FIG. 8, laser light incident on diffraction element 21 is converted into diffraction image _S1 . Referring to FIG. 11, the laser beam converted into diffraction image _S1 travels along optical path _L6 and enters mirror 62. Referring to FIG. The laser beam reflected by mirror 62 travels along optical path L ₇ and strikes mirror 63 . The laser beam reflected by mirror 63 travels along optical path _L8 and strikes mirror 64 . The laser light reflected by mirror 64 travels along optical path L ₉ and strikes mirror 65 . The laser beam reflected by the mirror 65 travels along the optical path _L10 and enters the screen 40. FIG. Referring to FIG. 3, a diffraction image _S1 is displayed on a screen 40. As shown in FIG.

1, 11 and 12, a diffraction image _S1 directly incident from screen 40 is reflected by first reflecting surface 42A and second reflecting surface 42B of reflecting member 41, and exits protective member 50. projected and displayed as image _S2 . The diffraction image _S1 is reflected by the mirror 61 and is incident on the reflecting member 41, so that it is projected outside the protective member 50 and displayed as an image _S3 . In the Z-axis direction, image _S3 is displayed further from the display than image _S2 .

Here, display device 1 according to the present embodiment includes diffraction element 21 and driving section 31 . By moving (rotating) the diffraction element 21 within a virtual plane T perpendicular to the optical axis V of the laser light emitted from the laser diodes 181, 182, and 183 by the drive unit 31, the diffraction element 21 on which the laser light is incident is shifted. By changing the direction, the diffraction image projected on the screen 40 can be changed. As a result, the image projected outside the protective member 50 changes.

In the display device 1 according to the present embodiment, arrows are projected outside the protective member 50 . For example, by interlocking with a navigation system in a smartphone, the direction of an arrow projected by a signal from the smartphone can be changed. By doing so, the user can confirm the direction of the projected arrow without looking at the display screen of the smartphone, and can grasp the direction in which the user should go.

The display device 1 in the above embodiment includes a receiver 44 and a controller 45 . By adopting such a configuration, it is possible to control the driving section 31 and change the image displayed by the display device 1 based on the information received by the receiving section 44 .

With reference to FIGS. 3 and 12, display device 1 in the above embodiment includes mirror 61 . The _incident angle _{θ 1 of} the diffraction image S ₁ projected on the screen 40 is reflected by the mirror 61 and incident on the reflecting member 41 . is larger than the incident angle θ ₂ of the diffraction image S ₁ when By adopting such a configuration, the angle of incidence of the diffraction image S ₁ incident on the reflecting member 41 can be increased, and the diffraction image S ₁ can be projected at a greater distance from the display device 1 . Therefore, the image displayed from the display device 1 can be made easier to see.

The display device 1 in the above embodiment forms optical paths L ₆ , L ₇ , L ₈ , L ₉ , and L ₁₀ from the diffraction element 21 to the screen 40 for the laser light converted into the diffraction image S ₁ by the diffraction element 21 . Mirrors 62, 63, 64, and 65 are provided to reflect the laser light so as to do so. By adopting such a configuration, the length of the optical path of the laser light converted into the diffraction image _S1 by the diffraction element 21 can be made longer than when the laser light is directly incident on the screen from the diffraction element 21 . Therefore, the image displayed by the display device 1 can be enlarged.

In the above embodiment, the optical module 10 includes the first laser diode 181 as a red laser diode, the second laser diode 182 as a green laser diode, and the third laser diode 183 as a blue laser diode. However, the configuration is not limited to this, and any one or two colors, that is, one or two of the first laser diode 181, the second laser diode 182 and the third laser diode 183 may be included. Further, the number of lights emitted from the optical module 10 may be four or more by adding infrared light or the like. Further, in the above-described embodiment, the wavelength-selective filters are used as the first filter 191 and the second filter 192, but these filters may be polarization synthesis filters, for example. In the above embodiment, the case where the display device 1 includes the four mirrors 62, 63, 64, 65 as the second mirrors has been described, but the present invention is not limited to this, and one second mirror may be installed, A second mirror may not be installed. Although the display device 1 includes the mirror 61 in the above embodiment, the present invention is not limited to this, and the mirror 61 may not be installed. In the above-described embodiment, the case where the diffraction element 21 rotates around the optical axis V has been described. However, the present invention is not limited to this. The laser beams emitted from 181, 182 and 183 may be converted into diffraction images different from the diffraction image _S1 .

It should be understood that the embodiments disclosed this time are illustrative in all respects and are not restrictive in any aspect. The scope of the present disclosure is defined by the claims rather than the above description, and is intended to include all changes within the meaning and range of equivalents of the claims.

The display device of the present disclosure is particularly advantageously applied when it is desired to change the displayed image.

1 display device 10 optical module 21 diffraction element 21A incident surface 21B exit surface 22 holding member 22A first gear 31 driving unit 31A second gear 40 screen 41 reflecting member 42 reflecting unit 42A first reflecting surface 42B second reflecting surface 44 receiving unit 45 control unit 46 substrate 50 protection member 51 lid 51A opening 52 case 53 first recess 54 second recess 59 support members 61, 62, 63, 64, 65 mirrors 61A, 62A, 63A, 64A, 65A reflective surface 70 battery 80 Mobile terminal 110 Base bodies 110A, 110B Main surface 120 Light forming part 140 Cap 141 Output window 142 Transmission member 151 Lead pin 160 Base block 160A Mounting surface 171 First submount 172 Second submount 173 Third submount 181 First laser diode 182 Second laser diode 183 Third laser diode 191 First filter 192 Second filter 531 Bottom wall surface 541 Inner wall portion 551 First groove 552 Second groove 553 Third grooves L ₁ , L ₂ , L ₃ , L ₄ , L ₅ , L ₆ , L ₇ , L ₈ , L ₉ , L ₁₀ Optical path S ₁ diffraction image S ₂ , S ₃ image U Internal space V Optical axis W Center T Virtual plane θ ₁ , θ ₂ Incident angle

Claims (6)

a laser diode;
a diffraction element arranged on the optical path of the laser beam emitted from the laser diode and diffracting the laser beam to convert it into a diffraction image;
a driving unit that moves the diffraction element in a plane perpendicular to the optical axis of the laser beam;
a screen for projecting the diffraction image;
a protective member surrounding the laser diode, the diffraction element, the drive section, and the screen and having an opening;
A display device, comprising: a reflecting member that is installed in the opening and projects the diffraction image projected on the screen to the outside of the protection member by reflecting the diffraction image. a receiving unit for receiving information;
2. The display device according to claim 1, further comprising a control section that controls said driving section based on information received by said receiving section. The diffraction image projected on the screen is reflected toward the reflecting member, and the incident angle of the diffraction image incident on the reflecting member is greater than the incident angle of the diffraction image directly incident on the reflecting member from the screen. further comprising a first mirror installed so that the
3. The display device according to claim 1, wherein said protective member surrounds said laser diode, said diffraction element, said driving section, said screen, and said first mirror. further comprising a second mirror that reflects the laser light so as to form an optical path of the laser light converted into the diffraction image by the diffraction element from the diffraction element to the screen;
4. The display device according to any one of claims 1 to 3, wherein the protective member surrounds the laser diode, the diffraction element, the driving section, the screen, and the second mirror. a plurality of said laser diodes;
5. The display device according to any one of claims 1 to 4, further comprising a filter that combines the laser beams emitted from the plurality of laser diodes and emits the combined laser beams toward the diffraction element. The plurality of laser diodes are
a red laser diode that emits red laser light;
a green laser diode that emits green laser light;
6. The display device according to claim 5, comprising a blue laser diode that emits blue laser light.

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