JP7367525B2 - Display devices, display systems and mobile objects - Google Patents

Description

The present invention relates to a display device, a display system, and a moving object.

Patent Document 1 discloses a concave mirror 4 (projection means) that projects a display image of a display 3 onto a front windshield 2 of a vehicle, a reflection means 2a provided on the front windshield 2 that reflects the display image, and a concave mirror 4. an opening 7a provided in the instrument panel 7 located between the concave mirror 4 (projection means) and the reflection means 2a; and an opening 7a that is movable in the longitudinal direction of the vehicle. A head-up display device 1 is described that includes a bezel 8 (lid portion) having an opening 8a provided in the screen and having an opening 8a through which a displayed image is transmitted, and a control means 6b for controlling movement of the bezel 8 according to a projection direction. There is.

Patent Document 2 describes a projector 18 having an image generator 26 that generates an image, a concave mirror 30 that magnifies the image, and a projector 18 that projects the magnified image from the concave mirror 30 through an opening 32 of an instrument panel 16. A head-up display device 10 is described that includes a combiner 22 that images images.

An object of the present invention is to provide a display device, a display system, and a moving object that have a degree of freedom in layout.

A display device according to the present invention includes an emission part that emits image light, and a curved reflection part that reflects the image light, and the image light is reflected by the reflection part toward another reflection part that reflects the image light. In addition to emitting image light, the image light emitted from the emitting section can be incident on the reflecting section from a first direction and a second direction different from the first direction, and the reflecting section can be directed in the first direction. The first image light incident from the reflection part is reflected by the reflection part and another reflection part to reach the first reference position, and the second image light incident from the second direction to the reflection part is reflected by the reflection part and the other reflection part. The position where the first image light is reflected by the reflection part is the position where the second image light is reflected by the reflection part. the tilt of the reflective section when the first image light reaches the first reference position, and the tilt of the reflective section when the second image light reaches the second reference position. The first image light and the second image light intersect between the reflection part and another reflection part by changing the inclination of the reflection part so that the reflection part is different.

According to the present invention, it is possible to provide a display device, a display system, and a moving object that have a degree of freedom in layout.

1 is a diagram illustrating an example of a system configuration of a display system according to an embodiment. FIG. 1 is a diagram illustrating an example of a hardware configuration of a display device according to an embodiment. FIG. 2 is a diagram illustrating an example of a functional configuration of a control device according to an embodiment. FIG. 1 is a diagram showing an example of a specific configuration of a light source device according to an embodiment. 1 is a diagram showing an example of a specific configuration of an optical deflection device according to an embodiment. FIG. 3 is a diagram illustrating an example of a specific configuration of a screen according to an embodiment. FIG. 7 is a diagram for explaining the difference in effect due to the difference in magnitude between the diameter of an incident light beam and the diameter of a lens in a microlens array. FIG. 3 is a diagram for explaining the correspondence between mirrors of the optical deflection device and scanning ranges. FIG. 3 is a diagram showing an example of a scanning line locus during two-dimensional scanning. FIG. 7 is a diagram for explaining the optical path of image light according to a comparative example. FIG. 7 is a diagram for explaining an optical path of image light according to a second comparative example. FIG. 3 is a diagram for explaining the optical path of image light according to the embodiment. FIG. 3 is a diagram for explaining a reflection area in a free-form mirror. FIG. 3 is a diagram for explaining the relationship between a reflection area in a free-form mirror and an optical path of image light. FIG. 3 is a diagram for explaining the relationship between the overlapping range of reflection regions in a free-form mirror and the size of an opening. FIG. 3 is a diagram for explaining the relationship between the angle of a free-form mirror and the optical path of image light. FIG. 7 is a diagram for explaining an optical path of image light according to a modification of the embodiment.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In addition, in the description of the drawings, the same elements are given the same reference numerals, and overlapping description will be omitted.

●System Configuration FIG. 1 is a diagram showing an example of the system configuration of a display system according to an embodiment. The display system 1 allows the viewer 3 to view a displayed image by projecting the projection light PL projected from the display device 100 onto a transmissive and reflective member. The display image is an image that is superimposed and displayed as a virtual image 45 in the field of view of the observer 3. The display system 1 is provided, for example, in a moving body such as a vehicle, an aircraft, or a ship, or a non-mobile body such as a maneuver simulation system or a home theater system. In this embodiment, a case will be described in which the display system 1 is installed in an automobile, which is an example of a moving object. Note that the usage form of the display system 1 is not limited to this.

For example, the display system 1 displays navigation information necessary for operating the vehicle (for example, vehicle speed, course information, distance to the destination, current location name, presence or absence of an object in front of the vehicle, etc.) through the windshield 50. The observer 3 (driver) is made to visually recognize the location, signs such as speed limit, information such as traffic jam information, etc.). In this case, the windshield 50 functions as a transmissive/reflective member that transmits a portion of the incident light and reflects at least a portion of the remaining light. The distance from the viewpoint of the observer 3 to the windshield 50 is approximately several tens of cm to 1 m.

The display system 1 includes a display device 100 and a windshield 50. The display device 100 is, for example, a head-up display device (HUD device) mounted on an automobile, which is an example of a moving object. The display device 100 is placed at an arbitrary position according to the interior design of the automobile. For example, the display device 100 may be placed below the dashboard 200 of an automobile, or may be embedded within the dashboard.

The display device 100 includes a housing 90 that houses the image forming unit 10 and the free-form mirror 30. The image forming unit 10 includes a unit housing 12 , and the unit housing 12 includes a light source device 11 , a light deflection device 13 , a mirror 14 , and a screen 15 .

The light source device 11 as an example of a light source is a device that irradiates laser light emitted from a light source to the outside of the device. The light source device 11 may emit laser light that is a combination of laser light of three colors, R, G, and B, for example. The laser beam emitted from the light source device 11 is guided to the reflective surface of the optical deflection device 13. The light source device 11 has a semiconductor light emitting element such as an LD (Laser Diode) as a light source. Note that the light source is not limited to this, and may include a semiconductor light emitting element such as an LED (light emitting diode).

The optical deflection device 13, which is an example of the optical deflection unit, is a device that changes the traveling direction of laser light using MEMS (Micro Electro Mechanical Systems) or the like. The optical deflection device 13 includes scanning means such as a single micro MEMS mirror that swings about two orthogonal axes, or a mirror system that includes two MEMS mirrors that swing or rotate about one axis. configured by using The laser beam emitted from the optical deflection device 13 is scanned with respect to the mirror 14. Note that the optical deflection device 13 is not limited to a MEMS mirror, and may be configured using a polygon mirror or the like.

The mirror 14 is, for example, a concave mirror, and reflects the laser light emitted from the optical deflection device 13 and scanned by the reflective surface of the mirror 14 toward the screen 15 .

The screen 15 is an example of an emitting unit that emits image light, and a two-dimensional image (intermediate image) is formed on the screen 15 by scanning the laser light reflected by the reflective surface of the mirror 14 onto the screen 15. Form a certain image light. The screen 15 is a diverging member that has a function of causing the scanned laser light to diverge at a predetermined divergence angle. The screen 15 is configured, for example, in the form of an EPE (Exit Pupil Expander) by a transmissive optical element having a light diffusion effect, such as a microlens array (MLA) or a diffusion plate. Note that the screen 15 may be configured with a reflective optical element having a light diffusion effect, such as a micromirror array.

The light source device 11, the light deflection device 13, the mirror 14, and the screen 15 are held in the unit housing 12 and function as part of the image forming unit 10. Note that the screen 15 is not entirely covered by the unit casing 12 but is partially held by the unit casing 12 so that the diverging light emitted by the screen 15 can be emitted to the outside of the image forming unit 10. There is. Note that the unit housing 12 may be a single three-dimensional object, or may have a structure in which a plurality of members are combined. As an example of a structure in which a plurality of members are combined, a three-dimensional object having a size that covers the entire optical path between the light source device 11, the optical deflection device 13, the mirror 14, and a holder for holding the screen 15 is combined as a plurality of members. This can be used as the unit housing 12.

A virtual image 45 projected onto the free-form mirror 30 and the windshield 50 by laser light (luminous flux), which is diverging light emitted from the screen 15, is enlarged from the intermediate image formed on the screen 15 and displayed. The free-form mirror 30 is an example of a curved reflecting section that reflects the image light emitted from the screen 15, and the windshield 50 is an example of another reflecting section that reflects the image light reflected by the free-form mirror 30. This is an example.

The free-form mirror 30 is designed and arranged so as to offset image tilt, distortion, positional shift, etc. caused by the curved shape of the windshield 50. The free-form surface mirror 30 is rotatable about a rotation axis 301, thereby changing the inclination of the free-form surface mirror 30. For example, by rotating the rotation axis 301 about a straight line that passes through the center of gravity of the free-form mirror 30 and is parallel to the direction perpendicular to the plane of FIG. 1, the display position of the virtual image 45 in the vertical direction of the plane of FIG. 1 can be changed. Thereby, the free-form mirror 30 can adjust the reflection direction of the laser beam (luminous flux) emitted from the screen 15 and change the display position of the virtual image 45 in accordance with the position of the observer's 3 eyes. Note that the rotation axis 301 may be arranged at a position that does not pass through the center of gravity of the free-form mirror 30, taking into consideration vehicle mountability and the like.

The free-form mirror 30, which is an example of an imaging optical system, reflects the diverging light and projects the projection light PL in order to form a virtual image using the diverging light emitted from the screen 15. Therefore, the free-form mirror 30 is designed, for example, using existing optical design simulation software, so that the virtual image 45 is formed at a desired position and has a constant focusing power. The display device 100 includes a free-form mirror 30 such that the virtual image 45 is displayed at a position (depth position as seen from the observer 3), for example, 1 m or more and 30 m or less (preferably 10 m or less) from the viewpoint position of the observer 3. The focusing power of is set.

Note that the imaging optical system may be any optical system as long as it includes one or more condensing elements having a condensing function. The condensing element having a condensing function is not limited to a free-form mirror like the free-form mirror 30, but may be a concave mirror, a curved mirror, a Fresnel reflective element, or the like. Further, the condensing element is formed by vapor deposition, sputtering, or the like using a metal thin film such as aluminum or silver having a high reflectance. Thereby, the utilization efficiency of the light incident on the condensing element as projection light PL can be maximized, and a virtual image with high brightness can be obtained.

A partition member 901 in which an opening H is formed is integrally provided at the top of the housing 90. The projection light PL reflected by the free-form mirror 30 is projected to the outside of the display device 100 through the opening H, and is incident on the windshield 50.

The aperture H is an example of a transmission area that transmits the image light reflected by the free-form mirror 30. The partition member 901 is provided between the free-form mirror 30 and the windshield 50, and partitions the space on the free-form mirror 30 side and the space on the windshield 50 side. Block light between inside and outside. The partition member 901 may be provided separately from the housing 90 and may be provided integrally with the dashboard 200, for example.

A dustproof window 40 is provided to cover the opening H. The dustproof window 40 is provided to prevent external foreign matter from entering the housing 90 through the opening H, and is preferably formed of a material that particularly transmits the projection light PL.

The windshield 50, which is an example of a reflective member, is a transmissive reflective member that has a function of transmitting a portion of the laser beam (luminous flux) and reflecting at least a portion of the remaining portion (partial reflection function). The windshield 50 functions as a semi-transparent mirror that allows the observer 3 to view the scenery in front of him and the virtual image 45 . The virtual image 45 is image information for the observer 3 to visually recognize, for example, vehicle information (speed, mileage, etc.), navigation information (route guidance, traffic information, etc.), warning information (collision warning, etc.). Note that the transmissive and reflective member may be a front windshield or the like provided separately from the windshield 50.

The virtual image 45 may be displayed so as to overlap with the scenery in front of the windshield 50. Further, the windshield 50 is not flat but curved. Therefore, the imaging position of the virtual image 45 is determined by the free-form mirror 30 and the curved surface of the windshield 50. Note that the windshield 50 may utilize a semi-transmissive mirror (combiner) as an individual transmissive/reflective member having a partial reflection function.

The aperture H has a size that can secure at least an angle of view necessary for projecting the virtual image 45 onto the iris region of the observer 3. The iris is defined by JIS D 0021, and is an ellipse that represents an eye range that statistically represents the distribution of the positions of the eyes of the observer 3.

The free-form mirror 30 has a surface shape designed to reduce optical distortion generated in the windshield 50. The light beam incident on the free-form surface mirror 30 is reflected by the free-form surface mirror 30 according to the surface shape of the free-form surface mirror 30. The reflected light flux then enters the windshield 50 and reaches at least one viewpoint within the iris area including at least the center of the iris (reference eye point). The light beam incident on the windshield 50 is reflected according to the surface shape of the windshield 50.

With this configuration, the laser beam (luminous flux) emitted from the screen 15 is projected toward the free-form mirror 30. The projected light collected by the free-form mirror 30 passes through the opening of the housing 90, is projected toward the windshield 50, and is reflected by the windshield 50. The observer 3 can now visually recognize the virtual image 45, which is an enlarged intermediate image formed on the screen 15, by the light reflected by the windshield 50.

Note that the projection method of the display device 100 is a “panel method” in which an intermediate image is formed by an imaging device such as a liquid crystal panel, a DMD panel (digital mirror device panel), or a fluorescent display tube (VFD), and a “panel method” in which an intermediate image is formed by an imaging device such as a liquid crystal panel, a DMD panel (digital mirror device panel), or a fluorescent display tube (VFD); There is a "laser scanning method" in which an intermediate image is formed by scanning a laser beam with a scanning means.

The display device 100 according to the embodiment employs the latter "laser scanning method." In the "laser scanning method," each pixel can be assigned to emit light or not emit light, so it is generally possible to form a high-contrast image. Note that the display device 100 may use a "panel method" as a projection method, and in either method, a portion or the entire screen, which is a surface on which a real image is formed, may be made of a resin member.

●Hardware Configuration FIG. 2 is a diagram showing an example of the hardware configuration of the display device according to the embodiment. Note that the hardware configuration shown in FIG. 2 may have the same configuration in each embodiment, and components may be added or deleted as necessary.

The display device 100 includes a control device 17 for controlling the operation of the display device 100. The control device 17 is a controller such as a board or an IC chip mounted inside the display device 100. The control device 17 includes an FPGA (Field-Programmable Gate Array) 1001, a CPU (Central Processing Unit) 1002, a ROM (Read Only Memory) 1003, and a RAM (Random Access s Memory) 1004, I/F (Interface) 1005, bus line 1006 , an LD driver 1008, a MEMS controller 1010, and a motor driver 1012.

The FPGA 1001 is an integrated circuit whose settings can be changed by the designer of the display device 100. LD driver 1008, MEMS controller 1010, and motor driver 1012 generate drive signals according to control signals from FPGA 1001. The CPU 1002 is an integrated circuit that performs processing to control the entire display device 100. The ROM 1003 is a storage device that stores a program that controls the CPU 1002. The RAM 1004 is a storage device that functions as a work area for the CPU 1002. I/F 1005 is an interface for communicating with external devices. The I/F 1005 is connected to, for example, a CAN (Controller Area Network) of a car.

The LD 1007 is, for example, a semiconductor light emitting element that constitutes a part of the light source device 11. The LD driver 1008 is a circuit that generates a drive signal to drive the LD 1007. The MEMS 1009 is a device that constitutes a part of the optical deflection device 13 and displaces the scanning mirror. MEMS controller 1010 is a circuit that generates a drive signal to drive MEMS 1009. The motor 1011 is an electric motor that rotates the rotation shaft 301 of the free-form mirror 30. Motor driver 1012 is a circuit that generates a drive signal to drive motor 1011.

●Functional Configuration FIG. 3 is a diagram showing an example of the functional configuration of the control device according to the embodiment. The functions realized by the control device 17 include a vehicle information receiving section 171, an external information receiving section 172, an image generating section 173, and an image display section 174.

The vehicle information receiving unit 171 has a function of receiving vehicle information (information such as speed and mileage) from CAN or the like. The vehicle information receiving unit 171 is realized by the processing of the I/F 1005 and the CPU 1002 shown in FIG. 2, the program stored in the ROM 1003, and the like.

The external information receiving unit 172 has a function of receiving information external to the vehicle (position information from GPS, route information or traffic information from a navigation system, etc.) from an external network. The external information receiving unit 172 is realized by the processing of the I/F 1005 and the CPU 1002 shown in FIG. 2, the program stored in the ROM 1003, and the like.

The image generation section 173 has a function of generating image information for displaying the intermediate image and the virtual image 45 based on the information input by the vehicle information reception section 171 and the external information reception section 172. The image generation unit 173 is realized by the processing of the CPU 1002 shown in FIG. 2, a program stored in the ROM 1003, and the like.

The image display section 174 forms an intermediate image on the screen 15 based on the display information generated by the image generation section 173, and projects the laser beam (luminous flux) forming the intermediate image toward the windshield 50 to create a virtual image. This is a function to display 45. The image display unit 174 is realized by the processing of the CPU 1002, FPGA 1001, LD driver 1008, MEMS controller 1010, and motor driver 1012 shown in FIG. 2, and the program stored in the ROM 1003.

Image display section 174 includes a control section 175, intermediate image forming section 176, and projection section 177. The control unit 175 generates control signals that control the operations of the light source device 11 and the light deflection device 13 in order to form an intermediate image. Further, the control unit 175 generates a control signal that controls the operation of the free-form mirror 30 in order to display the virtual image 45 at a predetermined position.

The intermediate image forming section 176 forms an intermediate image on the screen 15 based on the control signal generated by the control section 175. The projection unit 177 projects the laser light forming the intermediate image onto a transmissive reflective member (such as the windshield 50) in order to form a virtual image 45 that is visible to the observer 3.

●Light source device FIG. 4 is a diagram showing an example of a specific configuration of the light source device according to the embodiment. The light source device 11 includes light source elements 111R, 111G, and 111B (hereinafter referred to as light source elements 111 when there is no need to distinguish between them), coupling lenses 112R, 112G, and 112B, apertures 113R, 113G, and 113B, and a combining element 114. , 115, 116, and a lens 117.

The three-color (R, G, B) light source elements 111R, 111G, and 111B are, for example, LDs (Laser Diodes) each having one or more light emitting points. The light source elements 111R, 111G, and 111B emit laser beams (luminous fluxes) having mutually different wavelengths λR, λG, and λB (for example, λR=640 nm, λG=530 nm, and λB=445 nm).

The emitted laser beams (luminous fluxes) are coupled by coupling lenses 112R, 112G, and 112B, respectively. Each coupled laser (light beam) is shaped by apertures 113R, 113G, and 113B, respectively. The apertures 113R, 113G, and 113B have shapes (for example, circular, elliptical, rectangular, square, etc.) according to predetermined conditions such as the divergence angle of the laser beam (luminous flux).

The respective laser beams (luminous fluxes) shaped by the apertures 113R, 113G, and 113B are combined by three combining elements 114, 115, and 116. The combining elements 114, 115, and 116 are plate-shaped or prism-shaped dichroic mirrors that reflect or transmit laser beams (luminous fluxes) depending on the wavelength and combine them into one luminous flux. The combined light beam passes through the lens 117 and is guided to the optical deflector 13.

●Light deflection device FIG. 5 is a diagram showing an example of a specific configuration of the light deflection device according to the embodiment. The optical deflection device 13 is a MEMS mirror manufactured by a semiconductor process, and includes a mirror 130, a meandering beam portion 132, a frame member 134, and a piezoelectric member 136. The optical deflection device 13 is an example of a scanning section.

The mirror 130 has a reflective surface that reflects the laser light emitted from the light source device 11 toward the screen 15 side. The optical deflection device 13 forms a pair of meandering beam portions 132 with a mirror 130 in between. The meandering beam portion 132 has a plurality of folded portions. The folded portion includes first beam portions 132a and second beam portions 132b arranged alternately. The meandering beam portion 132 is supported by a frame member 134. The piezoelectric member 136 is arranged to connect the adjacent first beam portion 132a and second beam portion 132b. The piezoelectric member 136 applies different voltages to the first beam portion 132a and the second beam portion 132b, thereby causing each of the beam portions 132a and 132b to warp.

As a result, adjacent beam portions 132a and 132b are bent in different directions. The mirror 130 rotates in the vertical direction about the left-right axis as the deflection is accumulated. With such a configuration, the optical deflection device 13 can perform optical scanning in the vertical direction with a low voltage. The horizontal optical scanning centered on the vertical axis is performed by resonance using a torsion bar or the like connected to the mirror 130.

●Screen FIG. 6 is a diagram showing an example of a specific configuration of the screen according to the embodiment. The screen 15 forms an image of the laser light emitted from the LD 1007 that forms part of the light source device 11 . Further, the screen 15 is a divergent member that emits light at a predetermined divergence angle. The screen 15 shown in FIG. 6 has a microlens array structure in which a plurality of hexagonal microlenses 150 are arranged without gaps. The width of the microlens 150 (distance between two opposing sides) is, for example, optimized in the range of 50 μm to 300 μm, and in this embodiment is about 200 μm. By making the microlenses 150 hexagonal in shape, the screen 15 can arrange a plurality of microlenses 150 at high density.

Note that the shape of the microlens 150 is not limited to a hexagon, and may be, for example, a quadrilateral, a triangle, or the like. Furthermore, although a structure in which a plurality of microlenses 150 are regularly arranged is illustrated, the arrangement of microlenses 150 is not limited to this, and for example, the centers of each microlens 150 may be eccentric to each other, It may be an array. When employing such an eccentric arrangement, each microlens 150 has a different shape.

Further, the height of the vertex in the optical axis direction may be changed. By randomly setting the eccentricity in the arrangement direction and the shift in the optical axis direction, it is possible to reduce speckles caused by interference of laser beams passing through the boundaries of adjacent microlenses and moiré caused by periodic arrangement.

The laser light that has reached the screen 15 is scanned through the microlens 150, and a plurality of dots are created by turning the laser light on and off during scanning, and for example, gradation display can be performed by combining the on and off lights. Alternatively, gradation display may be performed by modulating the intensity of the laser beam itself.

FIG. 7 is a diagram for explaining the difference in effect due to the difference in magnitude between the diameter of the incident light beam and the diameter of the lens in the microlens array. In FIG. 7(a), the screen 15 is constituted by an optical plate 151 on which microlenses 150 are arranged in alignment. When the optical plate 151 is scanned with the incident light 152, the incident light 152 is diverged by the microlens 150 and becomes diverging light 153. The screen 15 can diverge the incident light 152 at a desired divergence angle 154 due to the structure of the microlens 150. The period 155 of the microlens 150 is designed to be larger than the diameter 156a of the incident light 152. Thereby, the screen 15 does not cause interference between lenses and does not generate speckles (speckle noise).

FIG. 7B shows the optical path of diverging light when the diameter 156b of the incident light 152 is twice as large as the period 155 of the microlens 150. Incident light 152 enters two microlenses 150a and 150b, producing divergent lights 157 and 158, respectively. At this time, since two diverging lights exist in the region 159, light interference may occur. When this interference light enters the observer's eyes, it is visually recognized as speckles.

In consideration of the above, in order to reduce speckles, the period 155 of the microlens 150 is designed to be larger than the diameter 156 of the incident light. Although FIG. 7 has been described using a convex lens, the same effect can be obtained when a concave lens is used.

As explained above with reference to FIGS. 6 and 7, the screen 15, which is an example of the image forming section, has a function of diverging scanned laser light at a certain angle, and this function allows the viewer 3 to The image can be recognized within the range of the eye box, that is, the image can be recognized even if the position of the eyes changes to some extent while the observer 3 is seated in the driver's seat.

Therefore, in the screen 15 on which the microlenses 150 are mounted, the shape of the microlenses 150 must have a certain degree of precision in order to appropriately disperse the light. Further, it is preferable to use a material that can be easily mass-produced. Therefore, the screen 15 is formed by molding a resin material, for example. Specific examples of resins that satisfy the optical properties required for the microlens 150 include, but are not limited to, methacrylic resin, polyolefin resin, polycarbonate, and cyclic polyolefin resin.

FIG. 8 is a diagram for explaining the correspondence between the mirror of the optical deflection device and the scanning range. The light emission intensity, lighting timing, and light waveform of each light source element of the light source device 11 are controlled by the FPGA 1001. Each light source element of the light source device 11 is driven by an LD driver 1008 and emits laser light. As shown in FIG. 8, the laser beams emitted from each light source element and whose optical paths have been combined are two-dimensionally deflected around the α-axis and β-axis by the mirror 130 of the optical deflection device 13, and are scanned via the mirror 130. The light is irradiated onto the screen 15 as light. That is, the screen 15 is two-dimensionally scanned by main scanning and sub-scanning by the optical deflection device 13.

The scanning range is the entire range that can be scanned by the optical deflection device 13. The scanning light vibrates (reciprocates) the scanning range of the screen 15 in the main scanning direction (X-axis direction) at a fast frequency of about 20,000 to 40,000 Hz, and vibrates in the sub-scanning direction at a slow frequency of about several tens of Hz. Scans one way in the Y-axis direction. That is, the light deflection device 13 performs raster scanning on the screen 15. In this case, the display device 100 can perform drawing or display of a virtual image for each pixel by controlling the light emission of each light source element according to the scanning position (position of scanning light).

The time to draw one screen, that is, the scanning time for one frame (one period of two-dimensional scanning) is several tens of milliseconds because the sub-scanning period is several tens of Hz as described above. For example, when the main scanning period is 20,000 Hz and the sub-scanning period is 50 Hz, the scanning time for one frame is 20 msec.

FIG. 9 is a diagram showing an example of a scanning line locus during two-dimensional scanning. As shown in FIG. 9, the screen 15 includes an image area 15R1 (effective scanning area) where an intermediate image is drawn (on which light modulated according to image data is irradiated) and a non-image area 15R2. The non-image area 15R2 is a frame-shaped area surrounding the image area 15R1. The center of the image area 15R1 is indicated as C.

The scanning range is a range that includes the image area 15R1 and a part of the non-image area 15R2 (a part near the outer edge of the image area 15R1) on the screen 15. In FIG. 9, the locus of the scan line in the scan range is indicated by a zigzag line. In FIG. 9, the number of scanning lines is shown to be smaller than the actual number for convenience of explanation.

Furthermore, the screen 15 includes a synchronization detection area 15R3 including a light receiving element in a peripheral area of the image area 15R1 (a part of the non-image area 15R2) in the scanning range. In FIG. 9, the synchronization detection area 15R3 is set at the corner of the image area 15R1 on the -X side and the +Y side. As an example, a signal detected by a photodetector 121 placed in a position of the unit housing 12 to detect the scanning light incident on the synchronization detection region 15R3 is output to the FPGA 1001. The FPGA 1001 detects the operation of the optical deflection device 13 based on the timing at which the signal is received, and as a result, can determine the scan start timing and scan end timing.

As described above, the screen 15 is composed of a transmissive optical element having a light diffusion effect, such as a microlens array, but is not limited thereto. That is, depending on the device layout, for example, a reflective element having a light diffusion effect such as a micromirror array may be used. Further, the screen 15 may be a flat plate or a curved plate that does not have a light diffusion effect.

In the example shown in FIG. 9, the center of the screen 15 and the center C of an image area 15R1 (effective scanning area) where an intermediate image is drawn (irradiated with light modulated according to image data) are approximately equal to each other. Match. In this case, it can also be said that the center C of the image area 15R1 substantially coincides with the center of the screen 15.

The shapes of the screen 15 and the image area 15R1 are not limited to those shown in FIG. For example, in FIG. 9, the screen 15 and the image area 15R1 are substantially similar, and their centers almost match, but the invention is not limited to this. Even if they are substantially similar, their centers are shifted, that is, they do not match. You don't have to. Furthermore, the screen 15 and the image area 15R1 do not have to be similar. That is, for example, when the screen 15 is a flat rectangle, the image area 15R1 does not have to be a flat rectangle, but may be a curved surface or a rectangle or polygon different from the rectangle of the screen 15.

Note that the shape of the image area 15R1 can be determined, for example, by the shape of the portion of the unit housing 12 shown in FIG. 1 that holds the screen 15. In other words, if the screen 15 is held so as to cover the non-image area 15R2 by the unit housing 12 or the holding portion of the screen 15 that is a part of the unit housing 12, the held portion will be exposed to light from the unit housing. 12 and is not irradiated onto the free-form surface mirror 30, only the diverging light of the intermediate image in the image area 15R1 is irradiated onto the free-form surface mirror 30. By defining the shape of the image area 15R1 in this way, a virtual image 45 having a desired shape is formed.

FIG. 10 is a diagram illustrating the optical path of image light according to a comparative example. E indicates an eyelip that covers 99% of the eye range, E1 indicates a viewpoint position at the upper end of the eyelip (an example of the first reference position), and E2 indicates a viewpoint position at the lower end of the eyelip (an example of the second reference position). ) is shown.

L1 indicates the first image light that is emitted from the center of the screen 15 (C shown in FIG. 9), is reflected by the free-form mirror 30 and the windshield 50, and reaches the viewpoint position E1 at the upper end of the iris, and L2 is The second image light is emitted from the center of the screen 15 (C shown in FIG. 9), is reflected by the free-form mirror 30 and the windshield 50, and reaches the viewpoint position E2 at the lower end of the iris. X indicates the intersection of the first image light L1 and the second image light L2.

A1 shows a plurality of image lights that are emitted from the image area 15R1 of the screen 15 shown in FIG. 9 and reach the viewpoint position E1 at the upper end of the iris, and A2 shows a plurality of image lights that are emitted from the image area 15R1 and reach the viewpoint position E2 at the lower end of the iris. Shows multiple images of light reaching . The plurality of image lights A1 include the first image light L1, and the plurality of image lights A2 include the second image light L2.

θ1 indicates the inclination of the free-form mirror 30 from the reference angle when the first image light L1 reaches the viewpoint position E1 at the upper end of the iris, and 30 (θ1) indicates the inclination of the free-form mirror 30 when the inclination is θ1. 30 positions are shown. θ2 indicates the inclination of the free-form mirror 30 from the reference angle when the second image light L2 reaches the viewpoint position E2 at the lower end of the iris, and 30 (θ2) indicates the inclination of the free-form mirror 30 when the inclination is θ2. 30 positions are shown. Here, the reference angle of the free-form mirror 30 is determined when the image light emitted from the center of the screen 15 (C shown in FIG. 9) reaches the center of the viewpoint position E1 at the upper end of the iris and the viewpoint position E2 at the lower end of the iris. is the inclination of the free-form mirror 30.

In the comparative example shown in FIG. 10, since the intersection X of the first image light L1 and the second image light L2 is on the free-form mirror 30, the first The deviation between the image light L1 and the second image light L2 is large.

Therefore, the deviation between the plurality of image lights A1 and the plurality of image lights A2 increases from the free-form surface mirror 30 toward the windshield 50, and the plurality of image lights A1 or the plurality of image lights A2 at the position of the aperture H increases. As the occupied area S becomes larger, it is necessary to enlarge the opening H.

If the opening H is made larger, there is a problem that external light such as sunlight easily enters the inside of the housing 90, which is not desirable from a design point of view. On the other hand, as in Patent Document 1, it is possible to cover the opening with a movable lid that covers the opening, but this requires a moving mechanism and there is a problem that the device becomes larger.

Alternatively, by bringing the rotation axis 301 of the free-form mirror 30 close to the aperture H, the intersection X of the first image light L1 and the second image light L2 is brought close to the aperture H, and the first It is also possible to reduce the deviation between the image light L1 and the second image light L2. In this case, it is possible to make the aperture H smaller, but if the rotation axis of the free-form mirror 30 is placed near the aperture H, there is a problem that the device becomes larger.

FIG. 11 is a diagram illustrating the optical path of image light according to the second comparative example.

In the second comparative example shown in FIG. 11, unlike the comparative example shown in FIG. 10, the first image light L1 and the second image light L2 are incident on the free-form mirror 30 from different directions. Therefore, the position at which the first image light L1 is reflected by the free-form surface mirror 30 is lower than the position at which the second image light L2 is reflected by the free-form surface mirror 30.

In this case, the deviation between the first image light L1 and the second image light L2 becomes smaller from the free-form mirror 30 toward the windshield 50, but between the free-form mirror 30 and the windshield 50, the first The intersection point X between the image light L1 and the second image light L2 does not occur.

Therefore, as in the comparative example, the deviation between the plurality of image lights A1 and the plurality of image lights A2 is large between the free-form mirror 30 and the windshield 50, and the plurality of image lights A1 and the plurality of image lights A2 are occupied. The area to do this was getting bigger.

In FIG. 11, as a result of making the aperture H smaller, the ends of the plurality of image lights A1 and the plurality of image lights A2 are vignetted at the end ∨ of the aperture H. In this case, there is a problem that only a part of the plurality of image lights A1 or a plurality of image lights A2 reach the viewpoint position E1 at the upper end of the iris or the viewpoint position E2 at the lower end of the iris. That is, because the area S occupied by the plurality of image lights A1 and the plurality of image lights A2 at the position of the aperture H is large, the degree of freedom in layout such as designing the size of the aperture H is hindered.

The present embodiment has been made in view of the problems described above, and is achieved by reducing the deviation between the first image light L1 and the second image light L2 between the free-form mirror 30 and the windshield 50. , the purpose is to reduce the area occupied by the plurality of image lights A1 and the plurality of image lights A2 to improve the degree of freedom in layout, and specifically to reduce the aperture H.

FIG. 12 is a diagram illustrating the optical path of image light according to the embodiment. In the embodiment shown in FIG. 12, similarly to the comparative example shown in FIG. 10 and the second comparative example shown in FIG. 11, the direction of the image light incident on the free-form mirror 30 is on the positive side in the Z-axis direction. , the direction of the image light reflected by the windshield 50 is on the negative side in the Z-axis direction.

Furthermore, in the embodiment shown in FIG. 12, similarly to the second comparative example shown in FIG. 11, the first image light L1 enters the free-form mirror 30 from the first direction, and the second The light L2 enters the free-form mirror 30 from a second direction different from the first direction.

However, in the embodiment shown in FIG. 12, the free-form mirror 30 is rotated so that the difference in inclination (θ1-θ2) becomes larger than in the second comparative example shown in FIG. 11, the position where the first image light L1 is reflected by the free-form mirror 30 is higher than the position where the second image light L2 is reflected by the free-form mirror 30. It has become. Here, the same relationship holds true not only for the first image light L1 and the second image light L2 but also for the image light emitted from the same position on the screen 15. That is, the image light emitted from the same position on the screen 15 includes the first image light that reaches the viewpoint position E1 at the upper end of the iris, the second image light that reaches the viewpoint position E2 at the lower end of the iris, and the second image light that reaches the viewpoint position E2 at the lower end of the iris. The position where the first image light is reflected by the free-form mirror 30 is higher than the position where the second image light is reflected by the free-form mirror 30.

In this case, the deviation between the first image light L1 and the second image light L2 becomes smaller as it goes from the free-form mirror 30 toward the windshield 50, and the shift between the first image light L1 and the second image light L2 becomes smaller, and the shift becomes smaller near the opening H between the free-form mirror 30 and the windshield 50. Then, the first image light L1 and the second image light L2 intersect to form an intersection X.

This makes it possible to reduce the deviation between the first image light L1 and the second image light L2 and the deviation between the plurality of image lights A1 and the plurality of image lights A2 between the free-form mirror 30 and the windshield 50. Therefore, the area S occupied by the plurality of image lights A1 and the plurality of image lights A2 at the position of the aperture H becomes smaller. Therefore, the degree of freedom in layout is improved, and specifically, the opening H can be made smaller.

Further, in this embodiment, the screen 15 is a microlens array in which microlenses 150 that diverge and emit image light are arranged, as shown in FIGS. 6 and 7.

Thereby, the image light emitted from the screen 15 can enter the free-form surface mirror 30 from the first direction and the second direction, and the first image light L1 is transmitted between the free-form surface mirror 30 and the windshield 50. and the second image light L2 can intersect with each other.

FIG. 13 is a diagram illustrating a reflection area in a free-form mirror.

R1 indicates a first reflection area where the plurality of image lights A1 shown in FIG. A second reflection area is shown which is an area reflected by the curved mirror 30, and RS represents an area where the first reflection area R1 and the second reflection area R2 overlap.

As explained in FIG. 12, the position where the first image light L1 is reflected by the free-form surface mirror 30 is higher than the position where the second image light L2 is reflected by the free-form surface mirror 30. , the first reflective area R1 is higher than the second reflective area R2.

FIG. 14 is a diagram illustrating the relationship between the reflection area of the free-form mirror and the optical path of image light.

FIG. 14(a) shows a state in which the first reflective region R1 and the second reflective region R2 completely overlap.

In this case, as in the comparative example shown in FIG. 10, the intersection X of the first image light L1 and the second image light L2 is located on the free-form mirror 30.

FIG. 14(b) shows a state in which the difference in inclination (θ1−θ2) of the free-form mirror 30 is increased compared to FIG. 14(a).

In this case, the first reflection area R1 and the second reflection area R2 partially overlap, and as shown in FIG. 13, the intersection X of the first image light L1 and the second image light L2 is Located near opening H.

FIG. 14(c) shows a state in which the difference in inclination (θ1−θ2) of the free-form mirror 30 is smaller than that in FIG. 14(a).

In this case, compared to FIG. 14(b), the area RS where the first reflection area R1 and the second reflection area R2 overlap is smaller, and the first image light L1 and the second image light L2 The intersection point X is located above and further away from the opening H.

From the above, there is a correlation between the size of the area RS where the first reflection area R1 and the second reflection area R2 overlap and the position of the intersection X of the first image light L1 and second image light L2. I understand.

FIG. 15 is a diagram illustrating the relationship between the overlapping range of reflection regions in a free-form mirror and the size of the aperture.

Here, the ratio of the overlapping range of the reflective regions in the free-form mirror is (area of the region RS where the first reflective region R1 and the second reflective region R2 overlap)×2/(the area of the region RS where the first reflective region R1 and the second reflective region R2 overlap) (total area when the second reflective regions R2 do not overlap).

Further, the size of the aperture corresponds to the size of the area occupied by the plurality of image lights A1 and the plurality of image lights A2 in the vicinity of the aperture H, and the rate of change in the size of the aperture is shown in Fig. 14(a). ) is based on the size of the opening in the state.

When the ratio of the superimposed range is 0% to 50%, the intersection X of the first image light L1 and the second image light L2 is located above the aperture H, as shown in FIG. 14(c). To position.

When the ratio of the superimposed range is 50% to 60%, the intersection X of the first image light L1 and the second image light L2 is located near the aperture H, as shown in FIG. 14(b). .

When the ratio of the superimposed range is 60% to 100%, the intersection X of the first image light L1 and the second image light L2 is located below the aperture H, as shown in FIG. 14(a). To position.

From the above, the ratio of the overlapping range shown in FIG. It is preferable that the relationship (total area when region R1 and second reflective region R2 do not overlap)≦80% is satisfied. Furthermore, 50%≦(Area of the region RS where the first reflective region R1 and the second reflective region R2 overlap)×2/(The first reflective region R1 and the second reflective region R2 do not overlap) It is more preferable that the relationship (total area)≦60% is satisfied.

Thereby, the display device 10 can reduce the size of the opening H by 10% or more compared to the state shown in FIG. 14(a).

Note that the numerical values shown in FIG. 15 are just an example, and the numerical values change depending on the specifications of the virtual image distance, virtual image angle of view, looking down angle, the positional relationship between the free-form mirror 30 and the windshield 50, the shape of the windshield 50, etc.

FIG. 16 is a diagram illustrating the relationship between the angle of the free-form mirror and the optical path of image light.

The free-form surface mirror 30 is moved from the iris center position E0 on the optical path connecting the iris center position E0 between the viewpoint position E1 at the upper end of the iris and the viewpoint position E2 at the lower end of the iris, and the iris center position E0 and the reflection position of the free-form surface mirror 30. Let L be the distance from the iris center position E0 to the windshield 50 on the optical path connecting the iris center position E0 and the reflection position of the free-form mirror 30.

In addition, the distances from the iris center position E0 to the viewpoint position E1 at the upper end of the iris and the viewpoint position E2 at the lower end of the iris are Le, and from the iris center position E0 to the intersection X of the first image light L1 and the second image light L2. Let D be the distance between.

Then, the looking down angle from the center position E0 of the iris is β0, the looking down angle from the viewpoint position E1 at the upper end of the iris is β1, the looking down angle from the viewpoint position E2 at the lower end of the iris is β2, and the first image light L1 is at the upper end of the iris. The inclination of the free-form surface mirror 30 from the reference angle when reaching the viewpoint position E1 is θ1, and the inclination of the free-form surface mirror 30 from the reference angle when the second image light L2 reaches the viewpoint position E2 at the lower end of the iris is θ1. Let it be θ2.

Here, the difference β between the downward angles β1 and β2 is equal to the sum of the inclinations of the free-form mirror 30 from the reference angle. That is, β=β1−β2=θ1+θ2 holds true.

Based on the above, the intersection X of the first image light L1 and the second image light L2 is located between the free-form mirror 30 and the windshield 50 when the following formula holds.

W<D<L, where D=Lecos(θ1+θ2)/tan((θ1+θ2)/2)

That is, by setting the sum of the inclinations (θ1+θ2) of the free-form mirror 30 from the reference angle so as to satisfy the above formula, the first image light L1 and the first image light L1 are separated between the free-form mirror 30 and the windshield 50. The two image lights L2 can be reliably intersected.

Note that in the case of a HUD device, since navigation, speed display, road obstacle detection, etc. are often displayed, it is desirable that the image be displayed at a position lower than the horizontal plane with respect to the iris. In this case, β1>β2 and β2>0, so β>0 holds true.

Further, when the above formula holds true, β1 becomes larger and β2 becomes smaller compared to the case where D=L. That is, it can be seen that since β becomes larger, the sum of the inclinations of the free-form surface mirror 30 from the reference angle (θ1+θ2) needs to be made larger.

FIG. 17 is a diagram illustrating the optical path of image light according to a modification of the embodiment.

In addition to the embodiment described in FIG. 12, the display device 10 includes a planar folding mirror 80 (an example of a light deflection section) in the optical path between the screen 15 and the free-form mirror 30. The folding mirror 80 is rotatable about a rotation axis 801 and deflects image light emitted from the screen 15.

Thereby, the display device 10 calculates the angular difference between the first direction in which the first image light L1 is incident on the free-form mirror 30 and the second direction in which the second image light L2 is incident on the free-form mirror 30. Since it can be made large, the first image light L1 and the second image light L2 can easily intersect between the free-form mirror 30 and the windshield 50.

As described above, the display device 10 according to an embodiment of the present invention includes the screen 15 (an example of an output section) that emits image light, and the free-form mirror 30 (an example of a reflection section) with a curved surface that reflects the image light. (one example), and emits the image light reflected by the free-form mirror 30 toward a windshield 50 (an example of another reflecting part) that reflects and transmits the image light, and also emits the image emitted from the screen 15. The light can enter the free-form mirror 30 from a first direction and a second direction different from the first direction, and the first image light L1 that enters the free-form mirror 30 from the first direction is The second image light L2 is reflected by the free-form mirror 30 and the windshield 50, reaches the viewpoint position E1 (an example of the first reference position) at the upper end of the iris, and enters the free-form mirror 30 from the second direction. , the first image light L1 is reflected by the free-form surface mirror 30 and the windshield 50 and reaches the viewpoint position E2 (an example of a second reference position) at the upper end of the iris, which is lower than the viewpoint position E1 at the upper end of the iris, and the first image light L1 is reflected by the free-form surface mirror 30 and the windshield 50. The position where the second image light L2 is reflected by the mirror 30 is higher than the position where the second image light L2 is reflected by the free-form mirror 30.

Thereby, the display device 10 allows a plurality of image lights A1 to reach the viewpoint position E1 at the upper end of the iris between the free-form mirror 30 and the windshield 50, and a plurality of image lights A2 to reach the viewpoint position E2 at the lower end of the iris. Since the area occupied by and can be reduced, the degree of freedom in layout when installing the display device 10 is improved.

The display device 10 also includes a screen 15 that emits image light, and a curved free-form mirror 30 that reflects the image light. The image light reflected by the screen 15 is emitted, and the image light emitted from the screen 15 can enter the free-form surface mirror 30 from the first direction and a second direction different from the first direction. The first image light L1 that enters the mirror 30 from the first direction is reflected by the free-form surface mirror 30 and the windshield 50 and reaches the viewpoint position E1 at the upper end of the iris, and then enters the free-form surface mirror 30 from the second direction. The incident second image light L2 is reflected by the free-form mirror 30 and the windshield 50 and reaches a viewpoint position E2 at the upper end of the iris, which is lower than the viewpoint position E1 at the upper end of the iris, and is reflected by the free-form mirror 30 and the windshield 50. The first image light L1 and the second image light L2 intersect between the two.

Thereby, the display device 10 reduces the area occupied by the first image light L1 and the second image light L2 between the free-form mirror 30 and the windshield 50, and reaches the viewpoint position E1 at the upper end of the iris. Since the area occupied by the plurality of image lights A1 reaching the viewpoint position E2 at the lower end of the iris can be reduced, the degree of freedom in layout when installing the display device 10 is improved. do.

A partition member 901 is provided between the free-form mirror 30 and the windshield 50 to partition the space on the free-form mirror 30 side and the space on the windshield 50 side. The partition member 901 is formed with an opening H (an example of a transmission region) through which the image light reflected by the free-form mirror 30 is transmitted.

The display device 10 includes a casing 90 that houses the screen 15 and the free-form mirror 30. In this embodiment, the partition member 901 is provided integrally with the housing 90, but may be provided separately from the housing 90, for example, integrally with the dashboard 200.

In this case, the display device 10 has an area S occupied at the position of the aperture H by the plurality of image lights A1 reaching the viewpoint position E1 at the upper end of the iris and the plurality of image lights A2 reaching the viewpoint position E2 at the lower end of the iris. By reducing , the aperture H can be made smaller, which improves the degree of freedom in layout.

The display device 10 includes a first reflection area R1 indicating an area where a plurality of image lights A1 including the first image light L1 and reaching a viewpoint position E1 at the upper end of the iris is reflected by the free-form surface mirror 30; A second reflection region R2 indicating an area where a plurality of image lights A2 including the second image light L2 and reaching a viewpoint position E2 at the lower end of the iris is reflected by the free-form mirror 30 satisfies the following relationship. It is composed of

30%≦(Area of region RS where first reflective region R1 and second reflective region R2 overlap)×2/(Total when first reflective region R1 and second reflective region R2 do not overlap) area) ≦80%

Thereby, in the display device 10, the opening H can be reliably made small, so that the degree of freedom in layout is reliably improved.

The screen 15 is a microlens array in which microlenses 150 that diverge and emit image light are arranged.

This allows the image light emitted from the screen 15 to enter the free-form mirror 30 from the first direction and a second direction different from the first direction, and the display device 10 Between the glasses 50, the first image light L1 and the second image light L2 can intersect.

The display device 10 also includes a rotatable planar folding mirror 80 (light deflection unit) that deflects image light emitted from the screen 15.

Thereby, the display system 1 can increase the angular difference between the first direction and the second direction, so that the first image light L1 and the second image light L1 can be separated between the free-form mirror 30 and the windshield 50. The image light L2 can be easily crossed. In this case, if there is no need to consider the size of the eyebox, the screen 15 does not need to emit image light in a divergent manner.

Furthermore, the display device 10 has an inclination θ1 of the free-form surface mirror 30 when the first image light L1 reaches the viewpoint position E1 at the upper end of the iris, and a tilt θ1 of the free-form surface mirror 30 when the first image light L1 reaches the viewpoint position E2 at the lower end of the iris. The inclination of the free-form surface mirror 30 is changed so that the inclination θ2 of the free-form surface mirror 30 at each time is different.

Thereby, the display device 10 can easily cause the first image light L1 and the second image light L2 to intersect between the free-form mirror 30 and the windshield 50. Note that if there is no need to consider the issue of observation system magnification, the first image light L1 and The second image light L2 may be crossed.

Then, the iris center position at the center of the viewpoint position E1 at the upper end of the iris and the viewpoint position E2 at the lower end of the iris is set to E0, and on the optical path connecting the iris center position E0 and the reflection position of the free-form surface mirror 30, from the iris center position E0 to the free-form surface The distance to the mirror 30 is L, on the optical path connecting the iris center position E0 and the reflection position of the free-form mirror 30, the distance from the iris center position E0 to the windshield 50 is W, and the viewpoint from the iris center position E0 to the top end of the iris Le is the distance to the position E1 and the viewpoint position E2 at the lower end of the iris, θ1 is the inclination from the reference angle of the free-form mirror 30 when the first image light L1 reaches the viewpoint position E1 at the upper end of the iris, and θ1 is the second distance. When the inclination of the free-form surface mirror 30 from the reference angle when the image light L2 reaches the viewpoint position E2 at the lower end of the iris is θ2, the following formula holds true.

W<D<L, where D=Lecos(θ1+θ2)/tan((θ1+θ2)/2)

Thereby, the display device 10 can reliably cause the first image light L1 and the second image light L2 to intersect between the free-form surface mirror 30 and the windshield 50.

Although the image forming apparatus according to the embodiment has been described above, the present invention is not limited to the above embodiment, and various modifications and improvements can be made within the scope of the present invention.

1 Display system 100 Display device 10 Image forming unit 11 Light source device (an example of a light source)
12 Unit housing 13 Light deflection device (an example of a light deflection unit)
14 Mirror 15 Screen (example of output part)
15R1 Image area 30 Free-form mirror (an example of a reflective part)
301 Rotation axis 40 Dust-proof window 45 Virtual image 50 Windshield (an example of other reflective parts)
70 Light shielding plate (an example of a light shielding part)
80 Reflection mirror (an example of a light deflection part)
801 Rotating shaft 90 Housing 901 Partition member H Opening (an example of a transmission area)

JP2014-210537 JP2018-004788

Claims (10)

an output section that outputs image light;
a curved reflecting section that reflects the image light;
A display device that emits the image light reflected by the reflection part toward another reflection part that reflects the image light,
The image light emitted from the emission section can enter the reflection section from a first direction and a second direction different from the first direction,
The first image light incident on the reflecting section from the first direction is reflected by the reflecting section and the other reflecting section and reaches a first reference position,
The second image light incident on the reflecting section from the second direction is reflected by the reflecting section and the other reflecting section and reaches a second reference position lower than the first reference position,
The position at which the first image light is reflected by the reflecting section is higher than the position at which the second image light is reflected by the reflecting section,
The inclination of the reflecting part when the first image light reaches the first reference position and the inclination of the reflecting part when the second image light reaches the second reference position are By changing the inclination of the reflective part,
The first image light and the second image light intersect between the reflecting section and the other reflecting section. Transmission for transmitting the image light reflected by the reflecting section through a partition member that is provided between the reflecting section and the other reflecting section and partitions a space on the reflecting section side and a space on the other reflecting section side. The display device according to claim 1 , wherein a region is formed. comprising a casing that houses the emission section and the reflection section,
The display device according to claim 2 , wherein the partition member is a part of the casing. a first reflection area indicating an area where a plurality of the image lights including the first image light and reaching the first reference position are reflected by the reflection section;
A second reflective area indicating an area where a plurality of the image lights including the second image light and reaching the second reference position are reflected by the reflecting section satisfies the following relationship. The display device according to any one of 1 to 3 .
30%≦(Area of the area where the first reflective area and the second reflective area overlap)×2/(Total area when the first reflective area and the second reflective area do not overlap)≦80% 5. The display device according to claim 1, wherein the emitting section diverges and emits the image light. The display device according to any one of claims 1 to 5 , further comprising a light deflection section that deflects the image light emitted from the emission section. The center position of the center between the first reference position and the second reference position is E0, and the distance from the center position E0 to the reflecting part is on an optical path connecting the center position E0 and the reflection position of the reflecting part. L, on the optical path connecting the center position E0 and the reflection position of the reflection part, W is the distance from the center position E0 to the other reflection part; from the center position to the first reference position and the second reference position; Le is the distance to each of the reference positions, θ1 is the inclination of the reflecting section from the reference angle when the first image light reaches the first reference position, and θ1 is the distance to each of the reference positions of the second image light. 7. The display device according to claim 1 , wherein the following formula holds true, where θ2 is an inclination of the reflecting portion from the reference angle when reaching the reference position of 2.
W<D<L, where D=Lecos(θ1+θ2)/tan((θ1+θ2)/2) A display system comprising the display device according to claim 1 and the other reflective section. 9. The display system according to claim 8 , wherein the other reflecting section reflects and transmits the image light reflected by the reflecting section. A moving body comprising the display system according to claim 8 or 9 .