JP7400605B2 - heads up display - Google Patents

Description

The present disclosure relates to heads-up displays.

2. Description of the Related Art A head-up display that uses a concave mirror (magnifying mirror) to enlarge a displayed image is known.

JP2012-32721A

However, in the conventional technology as described above, since the display image is enlarged only by increasing the size of the concave mirror, there is a problem that the head-up display becomes large.

Therefore, an object of the present disclosure is to suppress an increase in the size of a head-up display while enlarging a displayed image.

One aspect of the present invention is a head-up display mounted on a moving object, which projects light related to a first image and light related to a second image toward a light-transmitting member located in front of an occupant, and An image that forms a first display image based on the light related to the first image and a second display image based on the light related to the second image in front of the visual field of the occupant when viewed from a predetermined viewpoint associated with the image. The image light irradiation unit includes a light irradiation unit and a hologram provided on the light transmission member and into which light related to the first image is incident, and the image light irradiation unit is orthogonal to an emission unit (10, 51) that emits a laser beam. a plurality of optical elements (41) that are regularly arranged within a plane defined by a first direction and a second direction and that diffuse the incident laser light; and a spot diameter smaller than the size of one of the optical elements. scanning means (30, 52) capable of scanning the laser beam using the plane as a scanning surface so as to hit each of the plurality of optical elements; The scanning means emits a laser beam and a second laser beam corresponding to the second image, and the scanning means moves the first laser beam a predetermined amount upwardly or downwardly or horizontally from the center of the one optical element. the second laser beam is incident on a position on the opposite side of the first laser beam in the vertical direction or the horizontal direction across the center of the one optical element; The optical element emits the first laser beam and the second laser beam to a region of the light transmitting member that is offset in the vertical direction or the horizontal direction, and the first display image is displayed from the predetermined viewpoint. A head-up display is provided, which is formed at a position adjacent to the second display image in the vertical direction or the horizontal direction .

According to the present disclosure, it is possible to expand the displayed image while suppressing the increase in size of the head-up display.

FIG. 2 is a diagram schematically showing a state in which a head-up display is mounted on a vehicle, as viewed from the side of the vehicle. FIG. 1 is a schematic diagram showing the configuration of a head-up display according to an example (Example 1). FIG. 2 is a schematic diagram showing the configuration of an image light irradiation device. FIG. 2 is a schematic diagram showing an example of an arrangement of microlenses forming a screen. FIG. 3 is an explanatory diagram showing an upper scanning pattern and a lower scanning pattern according to an embodiment. FIG. 6 is an explanatory diagram of the principle by which two types of display images are generated by an upper scanning pattern and a lower scanning pattern. FIG. 2 is a schematic diagram showing the configuration of a head-up display according to a comparative example. FIG. 3 is a schematic diagram showing the configuration of a head-up display according to another example (Example 2). FIG. 3 is a schematic diagram showing the configuration of a head-up display according to another example (Example 3). FIG. 3 is a schematic diagram showing the configuration of a head-up display according to another example (Example 4).

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that in FIG. 4 and the like, for ease of viewing, only some of the parts or portions having the same attribute may be labeled with reference numerals.

[Heads-up display configuration]
FIG. 1 is a diagram schematically showing a state in which a head-up display 1 is mounted on a vehicle (an example of a moving object) when viewed from the side of the vehicle. FIG. 2 is a schematic diagram showing the configuration of a head-up display 1 according to an example (Example 1). FIG. 3 is a schematic diagram showing the configuration of the image light irradiation device 2. As shown in FIG. FIG. 4 is a schematic diagram showing an example of the arrangement of microlenses 41 forming the screen 40. FIG. 2 schematically shows the face of a driver (an example of a passenger) at a position corresponding to the eye box 5 from a certain viewpoint (an example of a predetermined viewpoint). Note that the eyebox 5 indicates a range in which the display image (virtual image display) VI can be visually recognized, and if the viewpoint is within the range, the display image (virtual image display) VI can be visually recognized. Furthermore, in FIG. 3, dotted arrows R0 to R4 schematically indicate the flow of electrical signals.

In the head-up display 1, as shown in FIG. 1, when the windshield WS is irradiated with display light, the driver driving the vehicle VC sees the display obtained by the irradiation in front of the windshield WS. Image (virtual image display) VI is visible. Thereby, the driver can visually recognize the display image VI superimposed on the scenery ahead. Therefore, the driver can grasp vehicle information and the like with less movement of his/her line of sight than when looking at the meter in the instrument panel 9, improving convenience and safety.

The head-up display 1 includes an image light irradiation device 2 (an example of an image light irradiation unit) and a hologram 3.

The image light irradiation device 2 emits light related to the first image (see line L1 in FIG. 2) toward a region R510 of the windshield WS (an example of a light-transmitting member) located in front of the driver. Light related to the second image (see line L2 in FIG. 2) is projected toward the region R520 (the hologram 3 on the region R520) substantially simultaneously. The windshield WS and the hologram 3 reflect light related to their respective images into the eyebox 5. In this case, a display image VI1 (an example of a first display image) based on light related to the first image and a display based on light related to the second image are displayed in front of the driver's visual field when viewed from the viewpoint related to the eye box 5. image VI2 (an example of a second display image).

The image light irradiation device 2 may have any configuration as long as it can project the light related to the first image and the light related to the second image onto the region R510 and the region R520 on the windshield WS. For example, the image light irradiation device 2 uses the principle of generating stereoscopic images, such as the parallax barrier method or lenticular lens method in a liquid crystal display, to emit light related to the first image and light related to the second image. may be generated. Alternatively, a projector such as a DLP (Digital Light Processing) projector may be used to generate the light related to the first image and the light related to the second image. Further, the image light irradiation device 2 may be realized by a combination of two or more image projection devices.

Below, the image (light) projected onto the windshield WS and the hologram 3 by the image light irradiation device 2 is also referred to as an "intermediate image." In this embodiment, as described above, two intermediate images of the first image and the second image are projected onto the windshield WS and the hologram 3 by the image light irradiation device 2.

In this embodiment, as an example, the image light irradiation device 2 includes a laser unit 10, a dichroic mirror unit 20, a condenser lens 28, a MEMS (Micro Electro Mechanical Systems) scanner 30, as shown in FIG. It includes a screen 40 and a control device 50.

The laser unit 10 includes laser irradiation devices 11, 12, and 13 for each color of red, blue, and green. The laser irradiation device 11 emits laser light in the red wavelength range. The laser irradiation device 12 emits laser light in the blue wavelength range. The laser irradiation device 13 emits laser light in the green wavelength range. Note that in this embodiment, since laser beams of these three colors can be emitted, a full-color display image VI can be generated. However, in the modified example, the number of color variations that can be displayed may be small.

The dichroic mirror unit 20 has dichroic mirrors 21, 22, and 23 corresponding to the laser irradiation devices 11, 12, and 13, respectively. Dichroic mirror 21 reflects only the red wavelength range. Therefore, the dichroic mirror 21 can reflect only the laser light incident from the laser irradiation device 11 toward the condenser lens 28 . The dichroic mirror 22 transmits the red wavelength range and reflects the blue wavelength range. Therefore, the dichroic mirror 22 can reflect the laser beam incident from the laser irradiation device 12 toward the condenser lens 28 while transmitting the laser beam incident from the dichroic mirror 21 . Similarly, the dichroic mirror 23 transmits the red and blue wavelength ranges and reflects the green wavelength range. Therefore, the dichroic mirror 23 can reflect the laser beam incident from the laser irradiation device 13 toward the condenser lens 28 while transmitting the laser beam incident from the dichroic mirror 22 .

As described above, the condensing lens 28 condenses the laser light (laser light of each color of red, blue, and green) that enters from the dichroic mirror unit 20 and emits it toward the MEMS scanner 30.

The condensing lens 28 projects the laser light incident from the dichroic mirror unit 20 onto the screen 40 with a spot diameter (diameter) smaller than the size of each of a plurality of microlenses 41 (described later) forming the screen 40. It is constructed and arranged so that For example, the spot diameter is adapted so that the following relational expression holds.
Spot diameter ≦ Lens pitch / Number of image separations Here, the lens pitch is the pitch of the array of multiple microlenses 41 (see PT1 and PT2 in FIG. 4), which will be described later, and the number of image separations corresponds to the number of intermediate images. However, in this embodiment, as an example, it is "2".

The MEMS scanner 30 projects laser light incident from the condensing lens 28 onto the screen 40 . The MEMS scanner 30 includes a MEMS mirror that is rotatable around two orthogonal axes. The projection position of the laser beam on the screen 40 changes depending on the orientation of the MEMS mirror. Therefore, the MEMS scanner 30 can arbitrarily change the projection position of the laser beam on the screen 40.

Screen 40 extends in a plane. In this embodiment, as an example, the screen 40 extends within a horizontal plane, but may be arranged in a direction slightly inclined with respect to the horizontal plane. As shown in FIG. 4, the screen 40 includes a plurality of microlenses 41 (an example of an optical element) regularly arranged within a plane. That is, the screen 40 includes a two-dimensional microlens array. The plurality of microlenses 41 typically have the same shape, but may be slightly different. In this embodiment, as an example, the outer shape is rectangular (square) when viewed in the direction perpendicular to the screen 40, but it may have another outer shape such as a hexagon. The screen 40 may have an entrance surface in a convex shape related to the plurality of microlenses 41, and an exit surface may be a flat surface (see FIG. 6).

In the example shown in FIG. 4, the plurality of microlenses 41 are arranged in a plane (arrangement plane) including the X direction (an example of the first direction) and the Y direction (an example of the second direction), and the plurality of microlenses 41 are preferably arranged regularly at a constant pitch, as shown in FIG. Note that in FIG. 4, the pitches PT1 and PT2 in the X direction and the Y direction are the same, but may be different. In this embodiment, as an example, the plurality of microlenses 41 are arranged in nine rows in the X direction and eight rows in the Y direction, but the number of rows in the X direction and the Y direction is arbitrary. Note that the X direction and the Y direction are also illustrated in FIG. 3 described above in association with the screen 40.

The control device 50 may be realized by a computer such as an ECU (Electronic Control Unit). The control device 50 includes a laser control section 51 and a scanner control section 52. In this embodiment, the laser control section 51 cooperates with the above-mentioned laser unit 10 to form an example of the emission means, and the scanner control section 52 cooperates with the above-mentioned MEMS scanner 30 to perform scanning. Forms an example of means.

The laser control section 51 controls the laser unit 10 based on the image signal for generating the display image VI (see arrows R1 to R3 in FIG. 3). In this embodiment, as an example, the image signals include a first image signal for generating a display image VI that is visible on the upper side when viewed from the eye box 5, and a first image signal that is visible on the lower side when viewed from the eye box 5. a second image signal for generating a display image VI. Note that the first image signal and the second image signal may be generated by an external ECU and provided to the control device 50 (see arrow R0 in FIG. 3), or may be generated by the control device 50 itself. good. In FIG. 2, the path of light based on the first image signal is shown by line L1, and in FIG. 2, the path of light based on the second image signal is shown by line L2.

In the following description, for the purpose of distinction, the display image VI that is visible on the upper side when viewed from the eye box 5 is also referred to as "display image VI1," and the display image VI that is visible on the lower side when viewed from the eye box 5 is also referred to as "display image VI1." It is also written as "display image VI2". Furthermore, hereinafter, unless otherwise specified, "display image VI1 (same as display image VI2)" refers to the entire display image VI1, and represents the entire output range related to display image VI1. For example, when the display image VI1 relates to a character representing speed, the display image VI1 does not refer only to the character portion, but refers to the entire output range including the character portion.

The display images VI1 and VI2 are visible when viewed from the eyebox 5, and are formed in a positional relationship that corresponds to each other. For example, the display images VI1 and VI2 may be continuous in the vertical direction and may be combined to form one display image. In this case, a larger display image can be formed than when display images VI1 and VI2 partially overlap.

The first image signal and the second image signal may be the same signal or may be different signals. In this embodiment, as an example, the first image signal and the second image signal are formed so as to generate visually recognizable information by a combination of display images VI1 and VI2. That is, the display images VI1 and VI2 generate information that is substantially meaningless when used alone, and when the two are combined, they generate information that is substantially meaningful. Alternatively, the amount of information that can be expressed by combining the display images VI1 and VI2 is greater than the amount of information that can be expressed individually.

For example, the display image VI1 represents a part of the navigation-related information (eg, map information), and the display image VI2 represents the remaining part of the navigation-related information. In this case, one piece of navigation-related information can be visually recognized by viewing the combination of the two display images VI1 and VI2 at the same time.

Alternatively, display image VI1 represents a portion of the warning message, and display image VI2 represents the remaining portion of the same warning message. In this case, one alarm message can be visually recognized by viewing the combination of the two display images VI1 and VI2 at the same time.

The first image signal is, for example, a signal representing a pixel value (brightness or color) of each pixel of an image of a predetermined size and a predetermined resolution. Further, the second image signal is, for example, a signal representing a pixel value (brightness or color) of each pixel of an image of a predetermined size and a predetermined resolution. In this case, the predetermined size and predetermined resolution may be the same for the first image signal and the second image signal. Note that each pixel of the image is associated with each position on the screen 40 (each position on the scanning plane). For example, each pixel of the image may be associated with each position of the screen 40 (each position on the scanning plane) in a one-to-one relationship. Note that each position of the screen 40 is associated with each direction of the MEMS mirror of the MEMS scanner 30.

When controlling the laser unit 10 based on the first image signal, the laser control unit 51 transmits signals from the laser unit 10 at timings corresponding to each pixel based on the pixel value of each pixel included in the first image signal. The laser unit 10 is controlled so that laser light of a color corresponding to each pixel value is emitted. The same applies to the second image signal.

The scanner control unit 52 controls the MEMS scanner 30 (see arrow R4 in FIG. 3). That is, the scanner control unit 52 scans the screen 40 with laser light by controlling the orientation of the MEMS mirror of the MEMS scanner 30. Here, "scanning the laser beam on the screen 40" means changing the projection position of the laser beam on the plane of the screen 40 (the projection position when viewed perpendicular to the plane of the screen 40). refers to Furthermore, in the following, the term "scanning pattern" refers to the locus of the projection position (the locus of the projection position of the laser beam on the plane of the screen 40). Further, the plane related to the screen 40 (that is, the plane on which the plurality of microlenses 41 are arranged) is also referred to as a "scanning plane."

Specifically, the scanner control unit 52 cooperates with the laser control unit 51 to scan the laser beam (an example of the first laser beam) according to the first image signal in an upper scanning pattern, and scans the upper side scanning pattern. A laser beam (an example of a second laser beam) corresponding to the image signal is scanned in a lower scanning pattern. That is, when operating based on the first image signal, the scanner control unit 52 applies a laser beam to each position on the scanning plane corresponding to each pixel based on the pixel value of each pixel included in the first image signal. The MEMS scanner 30 is controlled so that the laser beam from the unit 10 is projected. The same applies to the second image signal.

[Upper side scanning pattern and lower side scanning pattern]
Next, preferred examples of the upper scanning pattern and the lower scanning pattern will be described with reference to FIGS. 5 to 6.

FIG. 5 is an explanatory diagram showing an upper scanning pattern and a lower scanning pattern according to one embodiment, and is a diagram showing the screen 40 in a plan view. FIG. 6 is an explanatory diagram of the principle by which display images VI1 and VI2 are generated by the upper scanning pattern and the lower scanning pattern. In FIG. 5, the X1 side and the X2 side in the X direction are defined, and the Y1 side and the Y2 side in the Y direction are defined. In FIG. 6, the screen 40 is shown in a cross-sectional view with only three microlenses 41 arranged in the Y direction taken out. The Y direction corresponds to the vehicle longitudinal direction when the screen 40 is located in a horizontal plane. At this time, the X direction corresponds to the vehicle lateral direction (vehicle width direction). Note that in FIG. 6, the direction perpendicular to the paper surface is the X direction.

In the example shown in FIG. 5, the upper scanning pattern includes a plurality of upper scanning portions L401, and the lower scanning pattern includes a plurality of lower scanning portions L402. The upper scanning portion L401 and the lower scanning portion L402 pass through each microlens 41 and are offset from each other by a predetermined offset amount (=α+β) in the Y direction. In other words, the upper scanning portion L401 is offset by a predetermined amount α in the Y direction Y1 side with respect to the center O of each microlens 41, and the lower scanning portion L402 is offset with respect to the center O of each microlens 41. It is offset by a predetermined amount β in the Y direction Y2 side.

According to such an upper scanning pattern and a lower scanning pattern, the display image VI1 can be generated by the laser light (laser light according to the first image signal) scanned by the upper scanning pattern, and the lower scanning pattern The display image VI2 can be generated by a laser beam scanned in a pattern (laser beam according to the second image signal).

More specifically, as shown in FIG. 6, the laser light scanned by the upper scanning pattern (laser light according to the first image signal) is located on the Y1 side in the Y direction with respect to the center O of the microlens 41. The light is incident at a position shifted by a fixed amount α (see arrow R51). In this case, light is emitted from the microlens 41 in a direction corresponding to the shape (spherical shape) of the entrance surface of the microlens 41 (see arrow R511). On the other hand, as shown in FIG. 6, the laser light scanned by the lower scanning pattern (laser light according to the second image signal) is moved by a predetermined amount β toward the Y2 side in the Y direction from the center O of the microlens 41. The light enters at a shifted position (see arrow R52). In this case, light is emitted from the microlens 41 in a direction corresponding to the shape (spherical shape) of the entrance surface of the microlens 41 (see arrow R521). At this time, the incident position (spot position) on the first microlens 41, which is the incident position of the laser beam scanned by the upper scanning pattern (laser beam according to the first image signal), and the lower scanning pattern The incident position of the laser beam scanned in a pattern (laser beam according to the second image signal) is located on the opposite side in the Y direction with the center O of the microlens 41 interposed therebetween. Therefore, the emission direction of the laser beam from the microlens 41, which is the emission direction of the laser beam scanned by the upper scanning pattern (laser beam according to the first image signal) (see arrow R511), and the lower emission direction The emission directions (see arrow R521) of the laser beams scanned by the side scanning pattern (laser beams according to the second image signal) are inclined (non-directional) with respect to each other, as schematically shown in FIG. parallel). Therefore, there is a region R510 on the windshield WS where the laser light from the microlens 41 is incident and which is related to the laser light scanned by the upper scanning pattern (laser light according to the first image signal), and a lower region R510. The region R520 related to the laser light (laser light according to the second image signal) scanned with the normal scanning pattern is spaced apart from each other. Specifically, regions R510 and R520 are offset in the vertical direction in the windshield WS. As a result, as schematically shown in FIG. 2, laser light can be projected from the vertically offset regions R510 and R520 into the same eyebox 5 on the driver's side, so that a display visible from the eyebox 5 can be projected. Images VI1 and VI2 can be generated. Note that the predetermined offset amount correlates with the positional relationship between the display image VI1 and the display image VI2. The predetermined amounts α and β may be adapted depending on the desired positions of the regions R510 and R520 (and thus the desired positions of the displayed images VI1 and VI2).

Note that one scan may be realized by a scanning pattern that combines an upper scanning pattern and a lower scanning pattern, or the generation of the first image signal by the upper scanning pattern and the second image signal by the lower scanning pattern. If the image signals are generated close to each other in time, display images VI1 and VI2 can be generated substantially simultaneously. The display images VI1 and VI2 are visible when viewed from the eye box 5 described above, and are formed in a positional relationship that corresponds to each other. Therefore, the driver can view the displayed images VI1 and VI2 simultaneously without moving his/her viewpoint from the viewpoint associated with the eye box 5.

In this embodiment, as described above, the display images VI1 and VI2 are generated, but in addition to the display images VI1 and VI2, one or more other images different from the display images VI1 and VI2 are generated. The display image may be generated.

Further, in this embodiment, as described above, the light from the screen 40 is directly projected onto the windshield WS and the hologram 3, but it may be projected through an optical member. For example, the light from the screen 40 may be reflected by a concave mirror and then projected onto the windshield WS and the hologram 3. This also applies when the image light irradiation device 2 is a device of other types such as a parallax barrier type in a liquid crystal display, a lenticular lens type, or a DLP projector type.

[Hologram 3 and its related configuration]
Next, the hologram 3 and its related configuration will be described with reference to FIGS. 2 and 7 and subsequent figures.

The hologram 3 is provided on the windshield WS, as shown in FIG. The hologram 3 may be attached to the indoor surface of the windshield WS, or may be provided in an inner layer (for example, in an intermediate film) of the windshield WS.

The hologram 3 may be formed of a photopolymer, for example. The types of hologram 3 are reflection type, phase type, and volume type. The hologram 3 may be a hologram film several microns thick. Interference fringes are recorded in the hologram 3 in the form of changes in refractive index, for example. Note that the hologram 3 stores interference fringes for each of RGB wavelengths. In this case, a stacked hologram 3 may be formed by creating a hologram layer for each interference fringe for each of the RGB wavelengths and stacking the three hologram layers. Alternatively, a multiplexed hologram 3 may be realized in which RGB interference fringes are recorded in an overlapping manner.

The hologram 3 extends in a region R510 on the windshield WS where light related to the display image VI1 enters. That is, the windshield WS has a region R510 into which the light related to the display image VI1 enters, and a region R520 into which the light related to the display image VI2 enters, as a region into which the light from the image light irradiation device 2 enters. , the hologram 3 is provided in a region R510 of the two regions R510 and R520, into which light related to the display image VI1 enters. Note that a part of the hologram 3 may extend into the region R520 where the light related to the display image VI2 enters. That is, region R510 and region R520 may partially overlap.

The hologram 3 forms a display image VI1 at a position corresponding to the display image VI2 when viewed from the eyebox 5. That is, the display image VI1 and the display image VI2 are formed using the hologram 3 so as to have a corresponding positional relationship with respect to each other when viewed from the eyebox 5.

Note that the characteristics of the hologram 3 are such that the display image VI1 is determined based on the positional relationship of the eye box 5, the region R510 where the light related to the display image VI1 enters in the windshield WS, the image light irradiation device 2, the display image VI2, etc. It may be adapted to be visually recognized at a position associated with display image VI2.

Here, the effects of this embodiment will be explained in comparison with FIG. 7.

FIG. 7 is a schematic diagram showing the configuration of a head-up display 1' according to a comparative example. The head-up display 1' according to the comparative example differs from the head-up display 1 according to the present example in that it does not include the hologram 3. Therefore, in the comparative example, when the light related to display image VI1' (see line L1') enters region R510 and the light related to display image VI2 (see line L2) enters region R520, the respective lights are , is reflected toward the driver from region R510 and region R520 in the same manner. Therefore, as schematically shown in FIG. 7, a portion of the light incident on the region R510 is reflected outside the eyebox 5. In this case, in order to visually recognize the entire display image VI1, the driver needs to move his/her viewpoint upward.

Further, in the head-up display 1' according to the comparative example, as schematically shown in FIG. 7, the overlapping region in the vertical direction between the display image VI1 and the display image VI2 becomes large. Therefore, in the head-up display 1' according to the comparative example, the overall size of the display image formed by the combination of the display image VI1 and the display image VI2 is reduced by the overlap area in the vertical direction.

On the other hand, according to this embodiment, by providing the hologram 3 as described above, substantially all of the light incident on the region R510 can be reflected into the eye box 5. In other words, the hologram 3 is formed so as to reflect substantially all of the light incident on the region R510 into the eyebox 5. Furthermore, according to the present embodiment, by providing the hologram 3 as described above, it is possible to reduce or eliminate the vertical overlapping region between the display image VI1 and the display image VI2. As a result, the size of the display image VI formed by the combination of display images VI1 and VI2 can be efficiently increased.

In this manner, according to this embodiment, a relatively large display image VI can be formed by combining the display images VI1 and VI2 by using the hologram 3 without increasing the size of the concave mirror. That is, the display image VI can be enlarged while suppressing the increase in the size of the head-up display 1.

Further, according to the present embodiment, the quality (easiness of viewing) of the displayed image VI can be improved compared to the case where the displayed image VI of the same size is realized using only a concave mirror. That is, when a relatively large display image VI is realized using only a concave mirror, the concave mirror must have a high magnification, and the display image VI is likely to be distorted. On the other hand, according to this embodiment, since the display image VI is generated by a combination of the two display images VI1 and VI2, such distortion can be reduced or eliminated.

Next, other embodiments will be described with reference to FIGS. 8 to 10. Hereinafter, for distinction, the above-mentioned example will also be referred to as "Example 1."

FIG. 8 is a schematic diagram showing the configuration of a head-up display 1B according to another example (Example 2).

The head-up display 1B of this embodiment differs from the head-up display 1 of the first embodiment described above in that the hologram 3 is replaced with a hologram 3B. Hologram 3B is provided in region R520. The hologram 3B is formed so as to reflect substantially all of the light incident on the region R520 into the eyebox 5. Further, the hologram 3B is adapted so that the display image VI2 is visually recognized at a position closer to the display image VI1 (the same position as the display image VI1 of Example 1 described above).

This embodiment also provides the same effects as the first embodiment described above. Further, according to the present embodiment, the display image VI2 is visually recognized closer to the driver than the display image VI1, so the display image VI by the combination of the display image VI1 and the display image VI2 is displayed in a novel manner (for example, a three-dimensional It can be shown to the driver in a similar manner. Note that such a display image VI can be applied to, for example, augmented reality (AR).

In this embodiment, the display image VI2 is configured to be viewed closer to the driver than the display image VI1, but it may be the opposite. For example, by providing a hologram (not shown) similar to the hologram 3B in the region R510, a relationship may be realized in which the display image VI1 is viewed closer to the driver than the display image VI2.

FIG. 9 is a schematic diagram showing the configuration of a head-up display 1C according to another embodiment (Embodiment 3).

The head-up display 1C of this embodiment differs from the head-up display 1 of the first embodiment described above in that the hologram 3 is replaced with a hologram 3C. Hologram 3C is provided in region R510. The hologram 3C is formed so as to reflect substantially all of the light incident on the region R510 into the eyebox 5. Further, the hologram 3C is adapted so that the display image VI1 is visually recognized at a position further away than the display image VI2 (the same position as the display image VI2 of Example 1 described above).

This embodiment also provides the same effects as the first embodiment described above. Further, according to this embodiment, the display image VI1 is visible to the driver on the back side (front side) of the display image VI2, so the display image VI by the combination of the display image VI1 and the display image VI2 is It can be shown to the driver in a form (for example, a three-dimensional form). Note that such a display image VI can be applied to, for example, augmented reality.

Note that in this embodiment, the display image VI2 is configured to be visible to the driver further back than the display image VI1, but the reverse may be possible. For example, by providing a hologram (not shown) similar to the hologram 3C in the region R520, a relationship may be realized in which the display image VI2 is visible to the driver further back than the display image VI1.

FIG. 10 is a schematic diagram showing the configuration of a head-up display 1A according to another embodiment (Embodiment 4).

The head-up display 1A of this embodiment differs from the head-up display 1 of the first embodiment described above in that a hologram 3A is added. Hologram 3A is provided in region R520. The hologram 3A is formed so as to reflect substantially all of the light incident on the region R520 into the eyebox 5.

This embodiment also provides the same effects as the first embodiment described above. Further, in Examples 2 and 3, the same effects as in Examples 2 and 3 can be obtained by similarly using two holograms.
By using holograms with increased reflectance as these two holograms, it is possible to increase the light utilization efficiency. As a result, the amount of light outputted by the light source (laser unit 10) can be reduced, contributing to power saving, reduction in heat generation, and miniaturization of the heat sink that cools the light source.

Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the embodiments described above.

For example, in the above-mentioned Example 1 (the same applies to Examples 2 to 4), the regions R510 and R520 are set vertically on the windshield WS, and the hologram 3 has display images VI1 and VI2 adjacent to each other in the vertical direction. The display is adapted to be viewed in a non-limiting manner. Regions R510 and R520 may be set on the left and right sides on the windshield WS, and the hologram 3 may be adapted so that the display images VI1 and VI2 are viewed in a manner adjacent to each other in the set direction.

1 Head-up display 1A Head-up display 1B Head-up display 1C Head-up display 2 Image light irradiation device 3 Hologram 3A Hologram 3B Hologram 3C Hologram 5 Eye box 9 Instrument panel 10 Laser unit 11 Laser irradiation device 12 Laser irradiation device 13 Laser irradiation Device 20 Dichroic mirror unit 21 Dichroic mirror 22 Dichroic mirror 23 Dichroic mirror 28 Condenser lens 30 MEMS scanner 40 Screen 41 Microlens 50 Control device 51 Laser control section 52 Scanner control section L1 Line L2 Line VC Vehicle VI Display image (virtual image display)
VI1 Display image VI2 Display image WS Windshield

Claims (3)

A head-up display (1, 1A, 1B, 1C) mounted on a mobile object (VC),
The light related to the first image and the light related to the second image are projected toward a light transmitting member (WS) located in front of the occupant, and when viewed from a predetermined viewpoint associated with the occupant, the front of the visual field of the occupant is an image light irradiation unit (2) that forms a first display image (VI1) based on the light related to the first image and a second display image (VI2) based on the light related to the second image;
a hologram (3, 3A, 3B, 3C) provided on the light transmitting member and into which light related to the first image is incident;
The image light irradiation section is
Emitting means (10, 51) for emitting laser light;
a plurality of optical elements (41) that are regularly arranged within a plane defined by orthogonal first and second directions and that diffuse the incident laser light;
scanning means (30, 52) capable of scanning the laser beam using the plane as a scanning surface so as to hit each of the plurality of optical elements with a spot diameter smaller than the size of one of the optical elements;
The emitting means emits a first laser beam according to the first image and a second laser beam according to the second image, and the scanning means transmits the first laser beam to one of the optical systems. The second laser beam is incident at a position shifted by a predetermined amount in the vertical direction or the horizontal direction from the center of the element, and the second laser beam is directed in the vertical or horizontal direction across the center of the one optical element of the first laser beam. the first laser beam and the second laser beam are incident on opposite positions in the left-right direction, and the first laser beam and the second laser beam are directed to a region of the light-transmitting member offset in the vertical direction or the horizontal direction. Emits,
The first display image is formed at a position adjacent to the second display image in the vertical direction or the horizontal direction when viewed from the predetermined viewpoint.
Head-up display. The head-up display according to claim 1 , wherein the first image and the second image generate visually recognizable information by a combination of the first display image and the second display image. The head-up display according to claim 1, wherein the first display image is formed at a position farther or closer than the second display image when viewed from the predetermined viewpoint.

Images