JP5333781B2 - Head-up display device - Google Patents

Description

  The present invention relates to a head-up display device that visually provides various types of information such as instrument information to a driver of an automobile or the like using a projection image by a projector device.

  2. Description of the Related Art Conventionally, a head-up display device that projects various information images such as instrument information formed by a liquid crystal display and map information in a navigation device on a front window in a moving body such as an automobile and transmits the information to a driver is known. It has been. Patent Documents 1 to 3 disclose the use of such a head-up display device in a vehicle.

  Patent Document 1 includes a dimming screen disposed behind a transmissive dot matrix liquid crystal display panel capable of graphic display, and a backlight light source disposed behind the dimming screen. A head-up display device is disclosed that includes a display that reflects information display on a translucent reflector provided in front of the windshield. According to this head-up display device, the washout phenomenon of the display device in the head-up device for a vehicle that projects and displays the display image of the display device on a translucent reflector (combiner) disposed in the front view of the driver's seat. In addition, the durability of the backlight used to transmit and illuminate the display can be improved.

  Further, in Patent Document 2, a light emitting display source including a radiation mechanism that radiates display images such as various traveling data is arranged on the interior side of the roof panel located above the driver's seat, and a predetermined part of the instrument panel is arranged. Further, there is disclosed a vehicle head-up display provided with a mirror for projecting a display image radiated from a light emitting display source onto a front wind panel in front of a driver's seat. According to this vehicle head-up display, a large installation space is not required inside the vehicle instrument panel, and the layout becomes easy.

  Further, Patent Document 3 discloses that a transparent hologram that reproduces diffused light by reflection diffraction is used as a combiner in a head-up display device. By using a combiner using such a hologram, it is possible to provide a combiner and a head-up display device that can observe a bright reproduced image with less blur without requiring very high flatness. It becomes possible.

  Here, an embodiment of a head-up display device will be briefly introduced with reference to FIGS. FIG. 12 shows an embodiment in which various configurations of the head-up display device are incorporated in an instrument panel. Video information such as vehicle instrument information and map information from the navigation device is output and displayed on the liquid crystal display panel. A backlight as a light source is installed on the back surface of the liquid crystal display panel. By irradiating the liquid crystal display panel from the back surface, an image formed on the liquid crystal display panel is irradiated onto a concave mirror as an optical system enlarging element. The image reflected and enlarged by the concave mirror is projected on the inside of the front window or a transmissive reflector provided on the front window.

  The operator can view the display image (virtual image) located in front of the front window at the same time as the scenery outside the vehicle. In addition, by setting the distance to the display image (distance L) as far as possible, the operator can check video information such as instrument information and map information with a small amount of movement of the focal position.

  FIG. 13 is a view showing the state from behind the vehicle driver's seat, in which various types of video information are displayed within a display range surrounded by a broken line in the front window, and the driver is provided with various types of information arranged in the instrument panel. It is possible to obtain various information by video while paying attention to driving the vehicle without dropping the line of sight to the instruments.

JP 2000-131642 A Japanese Utility Model Publication No. 6-29095 Japanese Patent Laid-Open No. 9-179058

  Conventionally, a car navigation device is installed in a passenger compartment to provide a driver with route information to a destination. Normally, as a display device of a car navigation device, a thin liquid crystal monitor is fitted in the middle position of the console panel, and information displayed from both the driver's seat and the passenger seat, or a video such as a DVD can be viewed. Yes. Thus, a car navigation device as an information display device in a vehicle can provide information not only to a driver but also to a passenger who rides in a passenger seat. In particular, map information for displaying a current position, a target position, and the like on a car navigation device is one piece of information that passengers want to acquire when getting on.

  As described above, in the information display device using the liquid crystal monitor, it is easy for the driver and the passenger in the passenger seat to share the same information because of the size of the viewing angle. Also in the head-up display device described above, it is becoming possible to display high-resolution information such as map information by increasing the resolution of the projector device that projects video. However, in the conventional head-up display device described with reference to FIG. 12, the viewing angle is considerably limited, and for both the driver sitting in the driver seat and the passenger sitting in the passenger seat, Information and images could not be seen.

  FIG. 1 is an example in which an image by a conventional head-up display device is tried to be visually recognized by a plurality of observers. Two observers 1 and 2 are located facing the front window 21. The projector device 10 is disposed between the observer 1 and the observer 2 in order to allow two observers to visually recognize the image. Incident light emitted from the projector device 10 is reflected and magnified by the concave mirror 15 and is surface-reflected inside the front window 21. Since the surface reflection has the same incident angle and reflection angle, there is a problem that the image by the projector device 10 cannot be confirmed on the observer 2 side when matched with the observer 1 on the driver's seat side as shown in the figure.

  In order to solve the above problems, a head-up display device according to the present invention projects a holographic optical system disposed opposite to a first observation position and a second observation position, and an image onto the holographic optical system. The holographic optical system diffracts an image projected by the projector unit in the direction of the first observation position and the second observation position, and the first observation position and the An observation image is formed at each of the second observation positions.

To solve the above problems, a head-up display device of the present invention, holographic optical disposed to face the first viewing position of the first viewer, the second viewing position of the second observer And a projector unit that projects an image on the holographic optical system, and the holographic optical system displays an image projected by the projector unit in directions of the first observation position and the second observation position. It is characterized by an angle selectivity of Ru diffracts, to form a virtual image to image distant Te to each of the second viewing position the first viewing position to.

Head-up display device of the present invention, the first observation position of the first viewer, the holographic optical system is disposed opposite to the second observation position of the second viewer, the holographic optical A first projector unit that projects an image on a system, and a second projector unit that projects an image on the holographic optical system, wherein the first projector unit and the second projector unit are arranged on the holographic optical system. duplicate projection plane, the holographic optical system, an image in which the first projector unit for projecting, an angle selectivity of Ru is diffracted in the direction of the first viewing position, the first viewing position converting mechanism to form a first virtual image to image in the distance, an angle selectivity the second projector unit Ru diffracts an image to be projected in the direction of the second viewing position, the second It is characterized by forming a second virtual image to image distant similar observation position.

  Furthermore, in the head-up display device of the present invention, the holographic optical system is a volume holographic that diffracts an image projected by the projector unit in the direction of the first observation position and the second observation position. It is an optical element.

  Furthermore, in the head-up display device of the present invention, the holographic optical system has an optical magnification function.

  According to the present invention, a holo that diffracts the image projected by the projector unit in the direction of the first observation position where the first observer is located and the direction of the second observation position where the second observer is located. By using the graphic optical system, it is possible to provide an observation image to both the first observer and the second observer.

  Also, a holographic optical system that diffracts the image projected by the first projector unit in the direction of the first observation position and diffracts the image projected by the second projector unit in the direction of the second observation position is adopted. As a result, it is possible to provide images from different sources to a plurality of observers.

The figure for demonstrating the problem in the case of employ | adopting the conventional format. The figure which shows the head-up display apparatus which concerns on embodiment of this invention. 1 is a diagram showing a projector device according to an embodiment of the present invention. The figure which shows the head-up display apparatus which concerns on embodiment of this invention. The figure for demonstrating the lens function by a holographic optical element. The figure which shows the mode of mounting of a head-up display apparatus. The figure which shows the optical path of the head-up display apparatus which concerns on embodiment of this invention. The figure which shows the optical path in the holographic optical system which concerns on embodiment of this invention. The figure which shows the mode of mounting of the head-up display apparatus which concerns on other embodiment. The figure which shows the optical path of the head-up display apparatus which concerns on other embodiment. The figure which shows the optical path in the holographic optical system which concerns on other embodiment. The figure which shows the conventional head-up display apparatus. The figure which shows the mode of the image display in the vehicle interior by a head-up display apparatus.

  FIG. 2 is a diagram showing a part of the head-up display device according to the embodiment of the present invention, and shows a case where it is adopted in an automobile. Note that the head-up display device of the present invention is not limited to an automobile, and can be employed in a display device for a driver of various vehicles, a game machine, or a simulation device.

  A front window 21 of the automobile is arranged in the observation direction of the observer, and a holographic optical system 20 is stuck inside. The holographic optical system 20 is an optical member having see-through (transparency) characteristics that do not impair external light, and having wavelength selectivity and angle selectivity, and records an interference pattern between object light and reference light. Created. In the present embodiment, it functions as a combiner that superimposes the scenery outside the passenger compartment and the video information of the projector device 10 at the observation position.

  The projector device 10 (“projector unit” in the present invention) is a device that projects an image based on various types of input video information, and can use various methods such as a liquid crystal projector, a DLP projector, and an LCOS projector. It is. The image projected from the projector device 10 is diffracted by the holographic optical system 20 and is observed as a virtual image that forms an image far away at the observer's observation position. The observer, that is, the pilot, can visually recognize the scenery outside the passenger compartment and the video information from the projector device 10 without changing the line of sight. In the present embodiment, the imaging distance can be changed by changing the focal length of the projector device 10. As a result, the imaging distance is shortened when the vehicle ahead is near, and the imaging distance is increased when there is no vehicle ahead or far away. Make it visible.

  FIG. 3 is a diagram showing a projector apparatus according to the embodiment of the present invention. In the present embodiment, a laser is used as a light source, and a liquid crystal display element is used in an image forming unit that forms an image. The laser light source 11 is a light source device including a laser semiconductor 112, a diverging optical system 111, and the like, and the output light radiated from the laser semiconductor 112 is aligned in a predetermined irradiation cross-sectional shape by the diverging optical system 111. Output to the outside.

  The output light output from the laser light source 11 is adjusted to a necessary area as a backlight by the beam expander 12 and then irradiated to the back of the image forming unit 13. In the present embodiment, a liquid crystal display unit using a liquid crystal display element 131 is employed as the image forming unit 13. The output light of the laser light source 11 is adjusted by the diffusion plate 132 so that the intensity distribution is uniform, and then the image formed on the liquid crystal display element 131 is irradiated from behind and projected through the projection optical system 14. Form an image.

  An observer observes this projection image through the holographic optical system 20. This is made possible by the polarization function of the holographic optical system 20, but by providing the holographic optical system 20 with a lens function (optical magnification function), it is possible to provide a large image to the observer. In addition, the projection optical system 14 in the projector apparatus 10 can be downsized, and the projector apparatus 10 itself can be downsized.

  FIG. 4 is a diagram showing an optical path diagram of the head-up display device according to the embodiment of the present invention. An excellent holographic optical system 20 is attached to the inner surface of the front window 21 made of a transparent substrate. In addition, about the arrangement | positioning method of the holographic optical system 20 with respect to the windshield 21, in addition to sticking to an inner surface in this way, it sticks to the outer surface of the front window 21, or pinches | interposes between two transparent base materials etc. An appropriate method can be adopted. Further, the holographic optical system 20 may be disposed on a transparent base material provided separately from the front window 21 as well as the front window 21.

In the present embodiment, as shown in the figure, the holographic optical system 20 can visually recognize the image projected by the projector device 10 with respect to the observation position of the observer 1 and the second observer 2. It has become. Specifically, the incident light that enters the holographic optical system 20 from the projector device 10 is diffracted as diffracted light 1 for the observer 1 and diffracted light 2 for the observer 2. This utilizes the excellent angle selectivity of the holographic optical system.

  FIG. 5 is a diagram for explaining the holographic optical system. Since the holographic optical system 20 has high see-through properties, extraneous light passes through the holographic optical system 20 with almost no loss. On the other hand, incident light (reproduced light) emitted from the projector device 10 is diffracted in a predetermined direction by the holographic optical system 20 (angle selectivity). By manufacturing the holographic optical system 20 so that the diffracted light is diffracted toward the condensing point, a lens function (optical magnification function) can be provided.

  FIG. 6 is a diagram illustrating a state in which the head-up display device according to the embodiment of the present invention is mounted in the vehicle interior. In this way, by arranging the holographic optical system 20 having excellent angle selectivity in the front window 21, the projector device 10 can be used for both the driver 1 and the passenger 2 on the driver seat side. It becomes possible to provide an observation image. Further, when the holographic optical system 20 has an optical enlargement function, it is possible to provide a large image to the observer and to reduce the size of the projection optical system 14 in the projector device, thereby reducing the size of the projector device 10 itself. It is also possible to plan.

  The holographic optical system 20 according to the embodiment of the present invention will be described with reference to FIGS. FIG. 7 is an optical path diagram of the head-up display device according to the embodiment of the present invention as viewed from above.

  The holographic optical system according to the embodiment of the present invention is formed by stacking two holographic optical elements 20R and 20L. In the laminating method, two holographic optical elements 20R and 20L that are prepared in advance may be bonded together, or a material is applied on one holographic optical element and the other holographic optical element is applied. An element may be formed. Alternatively, a single holographic optical system in which a plurality of diffraction directions are recorded may be used.

  As shown in the optical path diagram of FIG. 7, the incident light irradiated from the projector device 10 is diffracted as diffracted light 1 by the first holographic optical element 20R, and forms an image that can be visually recognized by the first observer. Form. On the other hand, the diffracted light 2 diffracted by the second holographic optical element 20L forms an image visible to the second observer. As described above, the first holographic optical element 20R that diffracts in the direction of the observer 1 and the second holographic optical element 20L that diffracts in the direction of the observer 2 are provided, so An image can be provided to both the observer 1 and the observer 2.

  FIG. 8 is an enlarged schematic view of the holographic optical system 20 in the optical path diagram of FIG. In the figure, incident light emitted from the projector device 10 generates diffracted light 1 that is diffracted in the direction of the observer 1 by the first holographic optical element 20R. On the other hand, the transmitted light 1 transmitted through the first holographic optical element 20R is separated into diffracted light 2 and transmitted light 2 diffracted in the direction of the observer 2 by the second holographic optical element 20L.

In the present embodiment in which the two holographic optical elements 20R and 20L are stacked, the diffraction rate of both, that is, the intensity of the diffracted light with respect to the intensity of the incident light is taken into consideration, so that the observer 1 and the observer 2 In contrast, it is possible to provide an image having the same luminance. Specifically, the diffraction rate of the holographic optical element (in this case, the first holographic optical element 20R) located on the side closer to the observer (in this case, the power ratio of the diffracted light 1 to the incident light) is observed. Set lower than the diffractive index (in this case, the power ratio of the diffracted light 2 to the transmitted light 1) of the holographic optical element (in this case, the second holographic optical element 20L) located on the far side of the person Can be realized.

  As described above, in the present embodiment, the image projected by the projector device is diffracted in the direction of the first observation position where the first observer is located and the direction of the second observation position where the second observer is located. By using the holographic optical system, it is possible to provide an observation image to both the first observer and the second observer.

  In the present embodiment, the stacked first holographic optical element and second holographic optical element are used in the holographic optical system. However, in such a form, the relationship between the diffraction rates of the two is considered. By doing so, it is possible to provide images with substantially the same brightness to both observers.

  The holographic optical system is not limited to stacking the first and second holographic optical elements as in the present embodiment, and the image projected by the projector device is displayed in the first observation position and the second observation position. A volume type holographic optical element that diffracts in the direction of the observation position may be used.

  In this embodiment, the head-up display device in the vehicle is assumed and limited to the first and second observation positions. However, by increasing the diffraction direction of the holographic optical system, a plurality of (three or more) ) May be observable at the position.

  As described above, the present invention provides a head-up display device using a holographic optical system that diffracts in a plurality of directions using the angular selectivity of the holographic optical element. By using the system, another head-up display device having an excellent effect is also possible.

  In a vehicle, there are cases where the driver wants to see guidance information from the navigation device, and the passenger wants to see video information such as a DVD, that is, the driver and the passenger want to see images from different sources. By using the holographic optical system according to the embodiment of the present invention, it is possible to cope with such a situation.

  FIG. 9 is a diagram showing a state of mounting the head-up display device according to the embodiment of the present invention. In the present embodiment, by using the two projector devices 10R and 10L, it is possible to provide the images projected by the projector devices 10R and 10L to the viewer 1 and the viewer 2, respectively.

  FIG. 10 is a diagram showing an optical path of the head-up display device in this embodiment. As shown in the figure, a projector device 10R for the right side (driver seat side) and a projector device for the left side (passenger seat side) are provided. The holographic optical system 20 is the same as that described with reference to FIGS. 7 and 8, and is formed by laminating a first holographic optical element 10R and a second holographic optical element 10L.

  The incident light 1 irradiated by the right projector device 10R is diffracted by the first holographic optical element 20R to form an observation image at the observation position of the observer 1. On the other hand, the incident light 2 irradiated by the left projector device 10L is diffracted by the second holographic optical element 20L to form an observation image at the observation position of the observer 2. Thus, by projecting a plurality of video sources onto the holographic optical system 20 and setting each diffraction direction of the holographic optical system 20, different video sources can be obtained for the observer 1 and the observer 2. A head-up display device that can be provided can be realized.

  In addition, since the projection surfaces of both projector apparatuses 10R and 10L can be overlapped (shared) on the holographic optical system 20, it is possible to enlarge an image by both projector apparatuses 10R and 10L.

  FIG. 11 is an enlarged schematic diagram of the holographic optical system 20 in the optical path diagram of FIG. In the figure, incident light 1 emitted from the right projector device 10R generates diffracted light 1 diffracted in the direction of the observer 1 by the first holographic optical element 20R. On the other hand, the incident light 2 emitted from the left projector device 10L generates diffracted light 2 that is diffracted in the direction of the observer 2 by the second holographic optical element 20L.

  In the drawing, because of the schematic diagram, the projectors 10R and 10L are arranged as if the optical axes thereof are parallel to each other, but the optical axes are incident on the holographic optical system 20 at different angles when mounted. Arrange so that. This is because it is necessary to install only the right projector device 10R at the incident angle of the first holographic optical system 20R and only the left projector device 10L at the incident angle of the second holographic optical system 20L. It is.

  As described above, the present embodiment employs the holographic optical system that diffracts in a plurality of directions using the angle selectivity of the holographic optical element, so that images from different sources can be obtained by a plurality of observers. It is possible to handle when you want to see.

  In the present embodiment, the head-up display device in the vehicle is assumed and limited to the first and second observation positions. However, the number of projector devices is increased, and holographic optics corresponding to the number is provided. By setting the diffraction direction of the system, it is possible to observe different images at a plurality of (three or more) observation positions.

  Note that the present invention is not limited to these embodiments, and embodiments configured by appropriately combining the configurations of the respective embodiments also fall within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 10R ... Right side (driver's seat side) projector apparatus, 10L ... Left side (passenger side) projector apparatus, 11 ... Laser light source, 111 ... Divergence optical system, 112 ... Laser semiconductor, 12 ... Beam expander , 13 ... Image forming unit, 131 ... LCD, 132 ... Diffuser, 14 ... Projection optical system, 15 ... Concave mirror, 20 ... Holographic optical system, 20R ... First holographic optical element, 20L ... Second holographic Optical element, 21 ... front window

Claims (5)

A holographic optical system disposed opposite to the first observation position of the first observer and the second observation position of the second observer ;
A projector unit that projects an image on the holographic optical system,
The holographic optical system, an image which the projector unit projects, an angle selectivity of Ru is diffracted in the direction of the second observation position and the first observation position, the said first viewing position head-up display device, and forming a virtual image to image distant Te on each of the second viewing position. A holographic optical system disposed opposite to the first observation position of the first observer and the second observation position of the second observer ;
A first projector unit that projects an image on the holographic optical system;
A second projector unit that projects an image on the holographic optical system,
The first projector unit and the second projector unit overlap projection surfaces on the holographic optical system,
The holographic optical system, an image in which the first projector unit for projecting, an angle selectivity of Ru is diffracted in the direction of the first viewing position to form an image on the far boiled said first viewing position to form a first virtual image, forming an image in which the second projector unit for projecting an angle selectivity of Ru is diffracted in the direction of the second viewing position, the distal similar the second viewing position A head-up display device, wherein a second virtual image is formed. The head-up display device according to claim 1, wherein the holographic optical system is formed by laminating a first holographic optical element and a second holographic optical element. . The head-up display device according to claim 1, wherein the holographic optical system is a volume holographic optical element. The head-up display device according to any one of claims 1 to 4, wherein the holographic optical system has an optical enlargement function.

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