JP6737370B2 - Projection device - Google Patents

Description

The present invention relates to a projection device that projects a plurality of images.

For example, Patent Document 1 discloses a windshield display device that individually displays images on the driver's seat side and the passenger's seat side of a vehicle. In this windshield display device, an image is displayed on the driver side by a display and a combiner section on the driver side, and an image is displayed on the passenger side by a display and a combiner section on the passenger side.

JP, 2005-205974, A

In the display device described in Patent Document 1, there are display devices for projecting images on the driver's seat side and the passenger seat side, respectively. That is, since a plurality of light source units that emit light that forms an image are required, there are problems such as an increase in size of the device and an increase in cost.

The problems to be solved by the present invention are as described above. The main object of the present invention is to provide a projection device capable of projecting a plurality of images with one light source unit.

The invention described in the claims is a projection device for projecting different images on a first projection area and a second projection area on a projection surface, wherein the first image and the first image projected on the first projection area are One light source unit that emits a laser beam based on an image including a second image projected on two projection regions, and a splitting unit that splits the laser beam into a first beam and a second beam having different traveling directions. First scanning means for scanning the first beam onto an incident surface of a first optical means for irradiating the first projection region with light forming the first image, and the second beam for the second beam. Second scanning means for scanning the incident surface of the second optical means for irradiating the projection area with the light forming the second image, and control means for controlling the first scanning means and the second scanning means. The control means may be configured such that a portion of the first beam corresponding to the first image is scanned in the center, and a portion corresponding to the second image is located on the left or right or above and below the portion corresponding to the first image. A portion of the second beam corresponding to the second image while controlling the first scanning means so that the portion scanned by the position and corresponding to the first image is scanned by the first optical means. Is scanned in the center, the portion corresponding to the first image is scanned at the left and right or the upper and lower positions of the portion corresponding to the second image, and the portion corresponding to the second image is scanned by the second optical means. The second scanning means is controlled so as to be arranged in the periphery of the first optical means and the second optical means, and the scanning is not performed on the incident surface of the first optical means or the second optical means. A light blocking portion is provided for blocking the portion of the first beam corresponding to the second image or the portion of the second beam corresponding to the first image .

1 shows a schematic configuration of a projection device according to a first embodiment. It is a block diagram which shows the structure of the projection apparatus of 1st Example. It is a figure explaining the image display method by the projection apparatus of 1st Example. 2 shows a schematic configuration of a projection device according to a second embodiment. It is a figure explaining the image display method by the projection apparatus of 2nd Example. It is a figure explaining the image display method by the projection device of a modification.

In a preferred embodiment of the present invention, the projection device is a projection device for projecting different images on a first projection region and a second projection region on a projection surface, respectively. One light source unit that emits laser light based on an image including one image and a second image projected on the second projection area, and the laser light into a first beam and a second beam that have different traveling directions. Splitting means for splitting, first scanning means for scanning the first beam onto an incident surface of a first optical means for irradiating the first projection area with light forming the first image, and the second beam Controlling the second scanning means for scanning the incident surface of the second optical means for irradiating the second projection area with the light forming the second image, the first scanning means and the second scanning means. A control means, wherein the control means controls the first scanning means such that a portion of the first beam corresponding to the first image is scanned on an incident surface of the first optical means. At the same time, the second scanning means is controlled so that the incident surface of the second optical means is scanned with a portion of the second beam corresponding to the second image.

In the above-mentioned projection device, laser light is emitted from one light source unit based on the image including the first image and the second image, and is split into the first beam and the second beam by the splitting means. The first beam is irradiated onto the incident surface of the first optical means by the first scanning means, and the first optical means irradiates the light constituting the first image to the first projection area. The second beam is irradiated onto the incident surface of the second optical means by the second scanning means, and the second optical means irradiates the light forming the second image onto the second projection area. The first scanning means is controlled so that a portion of the first beam corresponding to the first image is scanned on the incident surface of the first optical means, and the second scanning means is controlled by the second scanning means. The portion of the second beam corresponding to the second image is controlled to be scanned. According to this projection device, different images can be projected on the projection surface using one light source unit. Therefore, the cost and size of the device can be reduced.

One mode of the above-mentioned projection device is arranged around the first optical means and the second optical means, and the first beam that is not scanned on the incident surface of the first optical means or the second optical means. Alternatively, a light blocking portion that blocks the second beam is provided. In this aspect, light other than the beam to be projected on the projection surface is blocked by the light blocking unit and is prevented from leaking to the outside.

Another aspect of the above projection apparatus is: first signal acquisition means for acquiring an image signal corresponding to the first image; second signal acquisition means for acquiring an image signal corresponding to the second image; A composite image generation unit that generates a composite image configured by arranging the first image and the second image based on the image signal acquired by the first signal acquisition unit and the second signal acquisition unit, The light source unit emits laser light based on the composite image. In this aspect, by separately preparing and supplying the image signals to be projected as the first image and the second image, it is possible to project each to the corresponding projection area.

In another aspect of the above projection apparatus, the control unit allows the first scanning unit to enter the first scanning unit while the central region of the scannable range of the first scanning unit is scanning. The first scanning means is controlled so as to reflect the first beam toward the central area of the incident surface of the first optical means, and the central area of the scannable range of the second scanning means is adjusted to the second area. While the scanning means is scanning, the second scanning means is controlled so as to reflect the second beam incident on the second scanning means toward the central region of the incident surface of the second optical means. .. In this aspect, since the image is projected using the central area of the scanning area by the scanning means, it is possible to stably project the high-resolution image.

In another aspect of the above projection apparatus, when one reciprocating scan in the main scanning direction of the first scanning unit and the second scanning unit is one cycle, the first scanning unit and the second scanning unit The scanning timing is shifted by about 1/4 cycle. Thereby, the image can be projected by utilizing the central area of the scanning area by the scanning means.

In another aspect of the above-mentioned projection device, the control means causes the portion of the first beam corresponding to the first image to be scanned in the center on the incident surface of the first optical means. The first scanning means is controlled so that the portion corresponding to the two images is scanned at the left and right positions of the portion corresponding to the first image, and the second beam is formed on the incident surface of the second optical means. The second scanning means is arranged so that a portion corresponding to the second image is scanned in the center and a portion corresponding to the first image is scanned to the left and right positions of the portion corresponding to the second image. Control. In this aspect, since the image is projected using the central area of the scanning area by the scanning means, it is possible to stably project the high-resolution image.

In another preferred embodiment of the present invention, a projection method executed by a projection device for projecting different images on a first projection area and a second projection area on a projection surface is performed by one light source unit, A laser beam emitting step of emitting a laser beam based on an image including a first image projected on one projection region and a second image projected on the second projection region; A dividing step of dividing into a first beam and a second beam having different traveling directions, and a first optical means for irradiating the first beam with the light forming the first image in the first projection region by the first scanning means. A first scanning step of scanning the incident surface of the means, and an incident surface of the second optical means for irradiating the second beam with the light forming the second image by the second scanning means. A second scanning step of scanning upward, and a control step of controlling the first scanning means and the second scanning means, wherein the control step comprises the first beam on the incident surface of the first optical means. And controlling the first scanning means so that a portion of the second beam corresponding to the first image is scanned and corresponding to the second image of the second beam on the incident surface of the second optical means. The second scanning means is controlled so that the portion to be scanned is scanned. Also by this projection method, different images can be projected on the projection surface using one light source unit. Therefore, the cost and size of the device can be reduced.

In another preferred embodiment of the present invention, the program executed by the projection device that projects different images on the first projection region and the second projection region on the projection surface is performed by one light source unit, A laser beam emitting step of emitting a laser beam based on an image including a first image projected on a projection region and a second image projected on the second projection region, and the laser beam is respectively advanced by a dividing means. A dividing step of dividing into a first beam and a second beam having different directions, and a first scanning means for irradiating the first beam with light forming the first image on the first projection region. On the incident surface of the second optical means for irradiating the second beam with the light forming the second image on the second projection area by the first scanning step of scanning on the incident surface of The projection device to perform a second scanning step of scanning the first scanning means and a control step of controlling the first scanning means and the second scanning means, and the control step is performed on the incident surface of the first optical means. The first scanning unit is controlled so that a portion of the first beam corresponding to the first image is scanned, and the first scanning unit controls the first scanning unit to scan the second plane of the second beam on the incident surface of the second optical unit. The second scanning means is controlled so that a portion corresponding to two images is scanned. Also with this program, different images can be projected on the projection surface using one light source unit. Therefore, the cost and size of the device can be reduced. This program can be stored in a storage medium and handled.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[First embodiment]
FIG. 1 shows the configuration of a projection device 10 according to the first embodiment. As shown in FIG. 1, the projection device 10 projects an image on a windshield 11 of a vehicle that functions as a screen. FIG. 1 is a view of the windshield 11 of the vehicle as viewed from the inside of the vehicle, that is, the front of the vehicle. In the following description, the component on the driver's seat side is attached with the subscript "d", the component on the passenger side is attached with the subscript "a", and is present on the driver side and the passenger side. The above subscripts are omitted when referring to the constituent elements regardless of the driver's seat side or the passenger's seat side.

The projection apparatus 10 includes a light source unit 1, a light shielding unit 12, field lenses 13a and 13d, EPEs (Exit Pupil Expanders) 14a and 14d, a half mirror 15, and MEMS (Micro Electro Mechanical Systems) mirrors 16a and 16d. , Is provided.

The light source unit 1 emits a laser beam L that forms an image. The configuration of the light source unit 1 will be described later. The laser light L emitted from the light source unit 1 is split into a laser light La reflected by the half mirror 15 and a laser light Ld transmitted through the half mirror 15.

The laser light Ld transmitted through the half mirror 15 enters the MEMS mirror 16d. The MEMS mirror 16d is swung by the MEMS control unit 8 to be described later as shown by an arrow 17, and reflects the incident laser beam Ld to the windshield 11 side. Due to the swing of the MEMS mirror 16d, the laser beam Ld is scanned within the region including the EPE 14d in the main scanning direction indicated by the arrow 18.

The EPE 14d is, for example, a microlens array in which a plurality of microlenses are arranged, expands the exit pupil of the laser light Ld, and forms an intermediate image of the image projected on the windshield 11.

The field lens 13d is disposed on the exit side of the EPE 14d, and the laser light Ld that has passed through the EPE 14d enters the field lens 13d. In the field lens 13d, the surface on which the laser light Ld from the EPE 14d is incident (that is, the incident surface) is configured in a flat shape, and the surface on the opposite side to the incident surface (that is, the exit surface) is configured in a spherical convex shape. The intermediate image forming the image is emitted toward the virtual image display area 11d on the driver's seat side of the windshield 11. The driver sitting in the driver's seat visually recognizes the virtual image projected on the virtual image display area 11d of the windshield 11 so that an image corresponding to an intermediate image is formed behind the windshield 11 (front of the traveling direction of the vehicle). To see as.

On the other hand, the laser light La reflected by the half mirror 15 enters the MEMS mirror 16a. The MEMS mirror 16a is swung by the MEMS control unit 8 described later as shown by an arrow 17, and reflects the incident laser beam La toward the windshield 11. Due to the swing of the MEMS mirror 16a, the laser beam La is scanned in the area including the EPE 14a in the main scanning direction indicated by the arrow 18.

The EPE 14a is also a microlens array in which a plurality of microlenses are arranged, for example, and enlarges the exit pupil of the laser light La to form an intermediate image of the image projected on the windshield 11.

The field lens 13a is arranged on the exit side of the EPE 14a, and the laser light La that has passed through the EPE 14a enters the field lens 13a. The field lens 13a is configured similarly to the field lens 13d, and emits an intermediate image forming an image toward the virtual image display area 11a on the passenger side of the windshield 11. The passenger sitting in the passenger seat visually recognizes the virtual image projected on the virtual image display area 11a of the windshield 11 to form an image corresponding to an intermediate image behind the windshield 11 (in front of the traveling direction of the vehicle). To see as.

FIG. 2 is a block diagram showing a configuration of the projection device 10, particularly a configuration of a signal processing system such as the light source unit 1. As a component of the signal processing system, the projection device 10 includes a light source unit 1, image signal input units 2a and 2d, a video ASIC (Application Specific Integrated Circuit) 3, a frame memory 4, a ROM 5, a RAM 6, and a laser. The driver ASIC 7 and the MEMS control unit 8 are provided.

The image signal input units 2a and 2d receive image signals input from the outside and output them to the video ASIC 3.

The video ASIC 3 is a block that controls the laser driver ASIC 7 and the MEMS control unit 8 based on the image signals input from the image signal input units 2a and 2d and the scanning position information S1a and S1d input from the MEMS mirrors 16a and 16d. , ASIC. The video ASIC 3 includes a synchronization/image separation unit 31, a bit data conversion unit 32, a light emission pattern conversion unit 33, and a timing controller 34.

The synchronization/image separation unit 31 separates the image data and the synchronization signal from the image signals input from the image signal input units 2a and 2d, and writes the image data in the frame memory 4.

Specifically, the synchronization/image separation unit 31 horizontally arranges the first image input from the image signal input unit 2a and the second image input from the image signal input unit 2d to generate a combined image. An example of the composite image is shown in FIG. In the example of FIG. 3A, the image of the dog on the left side is input as the first image from the image signal input unit 2a, and the image of the guide arrow on the right side is input as the second image from the image signal input unit 2d. The synchronization/image separation unit 31 combines the first image and the second image to generate a combined image, and writes the combined image in the frame memory 4.

The bit data conversion unit 32 reads the composite image data written in the frame memory 4 and converts it into bit data.

The light emission pattern conversion unit 33 converts the bit data converted by the bit data conversion unit 32 into a signal representing the light emission pattern of each laser.

The timing controller 34 controls the operation timing of the synchronization/image separation unit 31 and the bit data conversion unit 32. The timing controller 34 also controls the operation timing of the MEMS control unit 8 described later.

The composite image data generated by the synchronization/image separation unit 31 is written in the frame memory 4. The ROM 5 stores control programs and data for operating the video ASIC 3. Various data is sequentially read from and written to the RAM 6 as a work memory when the video ASIC 3 operates.

The laser driver ASIC 7 is a block that generates a signal for driving the laser diode provided in the light source unit 1, and is configured as an ASIC. The laser driver ASIC 7 includes a red laser drive circuit 71, a blue laser drive circuit 72, and a green laser drive circuit 73.

The red laser drive circuit 71 drives the red laser LD1 based on the signal output from the light emission pattern conversion unit 33. The blue laser drive circuit 72 drives the blue laser LD2 based on the signal output from the light emission pattern conversion unit 33. The green laser drive circuit 73 drives the green laser LD3 based on the signal output from the light emission pattern conversion unit 33.

The MEMS control unit 8 controls the MEMS mirrors 16a and 16d based on the signal output by the timing controller 34. The MEMS control unit 8 includes a servo circuit 81 and a driver circuit 82. The servo circuit 81 generates control signals S2a and S2d for controlling the operations of the MEMS mirrors 16a and 16d based on the signal from the timing controller 34. The driver circuit 82 amplifies the control signals S2a and S2d output from the servo circuit 81 to a predetermined level and outputs the amplified signals to the MEMS mirrors 16a and 16d, respectively.

The light source unit 1 emits laser light based on the drive signal output from the laser driver ASIC 7. Specifically, the light source unit 1 includes a red laser LD1, a blue laser LD2, a green laser LD3, collimator lenses 91a to 91c, and reflection mirrors 92a to 92c.

The red laser LD1 emits red laser light, the blue laser LD2 emits blue laser light, and the green laser LD3 emits green laser light. The collimator lenses 91a to 91c convert the red, blue, and green laser lights into parallel lights and emit the parallel lights to the reflection mirrors 92a to 92c, respectively. The reflection mirror 92b reflects the blue laser light. The reflection mirror 92c transmits the blue laser light and reflects the green laser light. The reflection mirror 92a transmits only the red laser light and reflects the blue and green laser lights. In this way, the red laser light transmitted through the reflection mirror 92 a and the blue and green laser lights reflected by the reflection mirror 92 a enter the half mirror 15.

The laser light Ld that has passed through the half mirror 15 is reflected by the MEMS mirror 16d and enters the EPE 14d. The MEMS mirror 16d is oscillated by the control signal S2d output from the MEMS control circuit 8, and scans the laser beam Ld within the scanning region including the EPE 14d.

On the other hand, the laser light La reflected by the half mirror is reflected by the MEMS mirror 16a and enters the EPE 14a. The MEMS mirror 16a is oscillated by the control signal S2a output from the MEMS control circuit 8 and scans the laser beam La within the scanning region including the EPE 14a.

In the above configuration, the half mirror 15 is an example of the dividing means of the present invention, the EPEs 14a, 14d and the field lenses 13a, 13d are an example of the optical means of the present invention, and the MEMS mirrors 16a, 16d are the scanning means of the present invention. The MEMS control unit 8 is an example of the control means of the present invention. The image signal input units 2a and 2d are an example of the signal acquisition means of the present invention, and the video ASIC 3 is an example of the composite image generation means of the present invention.

Next, an image display method by the projection device 10 will be described. FIG. 3B shows how the composite image is scanned by the MEMS mirror 16a. The MEMS mirror 16a swings in the main scanning direction (X direction) and the sub scanning direction (Y direction), and scans the incident laser light La on the XY plane. Specifically, the MEMS mirror 16a scans the laser beam La from top to bottom in the Y direction, and also scans the laser beam La so as to reciprocate left→right→left in the X direction. In the following description, a scan in which the scanning is performed from the left end to the right end of the combined image in the X direction and then back to the left end, that is, one reciprocating scan is defined as “one cycle”. In this embodiment, the MEMS mirrors 16a and 16d swing in synchronization with the X direction and the Y direction.

The MEMS control unit 8 scans the area of the EPE 14a with the first image (image of the dog) of the composite image, and scans the second image (image of the guide arrow) on the light shielding unit 12 of the MEMS mirror 16a. To control. As a result, the exit pupil of the first image is enlarged by the EPE 14a, and the first image is emitted by the field lens 13a toward the virtual image display region 11a on the passenger seat side of the windshield 11. On the other hand, the second image is blocked by the light shield 12 and is not projected onto the windshield 11, so that it is not visible. The light shielding portion 12 is preferably formed of a black member in order to reduce stray light that is generated by the reflection of light forming the image that is not displayed.

As a specific control method, the MEMS control unit 8 stores in advance the relationship between the swing angle of the MEMS mirror 16a in the XY directions and the position to which the light beam La is irradiated at the swing angle. The XY swing angle and the swing speed of the MEMS mirror 16a are adjusted so that the first image portion of the composite image is illuminated on the area of the EPE 14a and the second image portion is illuminated on the light shielding portion 12 on the right side thereof. Control.

FIG. 3C shows how the composite image is scanned by the MEMS mirror 16d. As illustrated, the MEMS mirror 16d swings in the X direction and the Y direction, and scans the incident laser light Ld on the XY plane. Specifically, the MEMS control unit 8 controls the MEMS mirror 16d so that the first image portion of the composite image is scanned on the light shielding unit 12 and the second image portion is scanned on the area of the EPE 14d. As a result, the exit pupil of the second image is enlarged by the EPE 14d, and the second image is emitted toward the virtual image display area 11d on the driver side of the windshield 11 by the field lens 13d. On the other hand, since the first image is blocked by the light blocking portion 12 and is not projected onto the windshield 11, it is not visually recognized.

In this way, the virtual images of the first image and the second image are displayed in the virtual image display regions 11a and 11d on the front passenger's seat side and the driver's seat side on the windshield 11, respectively, using the composite image emitted from one light source unit 1. be able to.

As described above, in the first embodiment, it is possible to provide the projection device capable of individually projecting a plurality of images by using one light source unit. Therefore, since the number of light source units can be reduced, the cost and size of the device can be reduced.
[Second Embodiment]

In the first embodiment, as shown in FIGS. 3B and 3C, the first image and the second image displayed as virtual images are the left half and the right of the composite image scanned by the MEMS mirrors 16a and 16d, respectively. It is one that uses half. However, in general, the MEMS mirror has a slow swinging speed at the end of the swinging area, so that the image display becomes unstable, and the resolution of the displayed image tends to decrease. That is, as the image displayed as the virtual image, the use of the central area where the swing speed is fast and stable is more stable than the use of the end portion of the composite image scanned by the MEMS mirror, and the image display is stable. High-resolution display is possible. Therefore, in the second embodiment, the first image and the second image are displayed as virtual images using the central area of the composite image scanned by the MEMS mirrors 16a and 16d.

FIG. 4 shows the configuration of a projection device 10x according to the second embodiment. The projection device 10x according to the second embodiment has the same basic configuration as the projection device 10 according to the first embodiment. However, as can be seen by comparing with FIG. 1, the scanning regions by the MEMS mirrors 16a and 16d are different. Specifically, in the second embodiment, the MEMS mirrors 16a and 16d swing so that the EPEs 14a and 14d are located substantially at the center of the scanning region in the X direction.

FIG. 5A shows how the composite image is scanned by the MEMS mirror 16a. As shown in the figure, in the second embodiment, the MEMS mirror 16a scans a region including the EPE 14a in the center in the X direction. That is, the left and right ends of the scanning area of the MEMS mirror 16a are located on the light shielding portion 12. Then, the swing of the MEMS mirror 16a is controlled so that the first image portion of the combined image is scanned in the area of the EPE 14a. Accordingly, the first image can be displayed in the central area of the scanning area of the MEMS mirror 16a, that is, the area in which the image can be stably displayed, and thus high-resolution display is possible.

FIG. 5B shows how the composite image is scanned by the MEMS mirror 16d. Similarly for the driver's seat side, the MEMS mirror 16d is controlled so as to scan a region including the EPE 14d in the center in the X direction and scan the region of the EPE 14d with the second image portion of the composite image. Accordingly, the second image can be displayed in the central region of the scanning region of the MEMS mirror 16d, that is, in the portion where the image can be stably displayed, and thus high-resolution display is possible.

In the second embodiment, the MEMS mirrors 16a and 16d oscillate in synchronization in the Y direction, but are scanned in the X direction with a scanning timing shifted by about 1/4 cycle. Specifically, when scanning the combined image shown in FIG. 3A as it is as in the first embodiment, that is, when the first image is displayed on the left half and the second image is displayed on the right half, The orientation of the MEMS mirror 16 is controlled so as to scan the upper left position of the scanning region at the timing when the laser light corresponding to the upper left pixel of the composite image is emitted from the light source unit 1.

On the other hand, as shown in FIG. 5A, when the first image is displayed in the center, the MEMS mirror 16a moves at the timing when the laser light forming the composite image is emitted from the light source unit 1. The scanning timing may be advanced by 1/4 cycle. By doing so, the MEMS mirror 16a starts scanning in the X direction from an image corresponding to the vicinity of the center of the second image in the composite image, and draws the first image in the central region corresponding to the EPE 14a.

On the contrary, when the second image is displayed in the center as shown in FIG. 5B, the scanning timing of the MEMS mirror 16d with respect to the timing at which the laser light forming the composite image is emitted from the light source unit 1. Should be delayed by 1/4 cycle. By doing so, the MEMS mirror 16d starts scanning in the X direction from an image corresponding to the vicinity of the center of the first image in the composite image, and draws the second image in the central region corresponding to the EPE 14d.

As described above, also in the second embodiment, it is possible to provide the projection device capable of individually displaying a plurality of images by using one light source unit. Therefore, since the number of light source units can be reduced, the cost and size of the device can be reduced. Further, in the second embodiment, since the first image and the second image are drawn by utilizing the center of the scanning area by the MEMS mirror 16, it is possible to stably perform high-resolution projection.
[Modification]

In the above embodiment, the first image and the second image are arranged in the horizontal direction to generate the combined image, but instead, the first image and the second image are arranged in the vertical direction to generate the combined image. Good. Specifically, as shown in FIG. 6, the synchronization/image separation unit 31 vertically defines the first image input from the image signal input unit 2a and the second image input from the image signal input unit 2b. To create a composite image.

As shown in FIG. 6A, the MEMS control unit 8 controls the MEMS mirror 16a so that the first image of the composite image is scanned in the area of the EPE 14a and the second image is scanned on the light shielding unit 12. To do. As a result, the exit pupil of the first image is enlarged by the EPE 14a, and the first image is emitted toward the virtual image display area 11a on the passenger seat side of the windshield 11 by the field lens 13a. On the other hand, the second image is blocked by the light shield 12 and is not projected onto the windshield 11, so that it is not visible.

In addition, as shown in FIG. 6B, the MEMS control unit 8 scans the light shielding unit 12 with the first image of the composite image and scans the area of the EPE 14d with the second image of the MEMS mirror 16d. To control. As a result, the exit pupil of the second image is enlarged by the EPE 14d, and the second image is emitted toward the virtual image display area 11d on the driver side of the windshield 11 by the field lens 13d. On the other hand, since the first image is blocked by the light blocking portion 12 and is not emitted to the windshield 11, it is not visually recognized.

Although the virtual image is projected on the windshield in the above embodiment, the virtual image may be projected on the combiner instead. Further, in the above-mentioned embodiment, the scanning means for scanning the laser beam is constituted by the MEMS mirror, but the scanning means may be constituted by a galvano mirror instead.

Further, in the above-described embodiment, the projection device of the present invention is applied to the head-up display, but instead, it may be applied to a retina scanning type head mounted display that scans RGB laser light on the retina. .. In this case, individual images can be displayed for the left eye and the right eye with only one light source unit, and thus stereoscopic viewing of images using binocular parallax can be realized.

1 Light source unit 3 Video ASIC
7 Laser driver ASIC
8 MEMS control part 11 Windshield 12 Light-shielding part 13a, 13d Field lens 14a, 14d EPE
15 Half mirror 16a, 16d MEMS mirror

Claims (4)

A projection device for projecting different images on a first projection area and a second projection area on a projection surface, respectively.
One light source unit that emits laser light based on an image including a first image projected on the first projection region and a second image projected on the second projection region;
Splitting means for splitting the laser light into a first beam and a second beam which respectively have different traveling directions;
First scanning means for scanning the first beam onto an incident surface of a first optical means for irradiating the first projection area with light forming the first image;
Second scanning means for scanning the second beam onto the incident surface of the second optical means for irradiating the second projection area with the light forming the second image;
Control means for controlling the first scanning means and the second scanning means,
Equipped with
In the control means, a portion of the first beam corresponding to the first image is scanned in the center, and a portion of the first beam corresponding to the first image is located at the left, right, or top and bottom of the portion corresponding to the first image. The first scanning unit is controlled so that a portion corresponding to the first image is scanned and is scanned by the first optical unit, and a portion of the second beam corresponding to the second image is in the center. So that the portion corresponding to the first image is scanned to the left and right or the upper and lower positions of the portion corresponding to the second image, and the portion corresponding to the second image is scanned by the second optical means. To control the second scanning means ,
A portion, which is arranged around the first optical means and the second optical means, and which corresponds to the second image of the first beam that has not been scanned on the incident surface of the first optical means or the second optical means. Alternatively , the projection apparatus is provided with a light shielding unit that shields a portion of the second beam corresponding to the first image . First signal acquisition means for acquiring an image signal corresponding to the first image,
Second signal acquisition means for acquiring an image signal corresponding to the second image,
And a composite image generation unit that generates a composite image configured by arranging the first image and the second image based on the image signals acquired by the first signal acquisition unit and the second signal acquisition unit. ,
The projection device according to claim 1, wherein the light source unit emits laser light based on the composite image. The control means, when the first scanning means scans the central area of the scannable range of the first scanning means, outputs the first beam incident on the first scanning means to the first optical means. While controlling the first scanning means so as to reflect the light toward the central area of the incident surface of the second scanning means, while the second scanning means scans the central area of the scannable range of the second scanning means, of claims 1 to 2, wherein the controller controls the second scanning means so as to reflect toward a second beam which is incident on the second scanning means in a central region of the incident surface of the second optical means The projection device according to any one of claims. A projection device for projecting different images on a first projection area and a second projection area on a projection surface, respectively.
One light source unit that emits laser light based on an image including a first image projected on the first projection region and a second image projected on the second projection region;
Splitting means for splitting the laser light into a first beam and a second beam which respectively have different traveling directions;
First scanning means for scanning the first beam onto an incident surface of a first optical means for irradiating the first projection area with light forming the first image;
Second scanning means for scanning the second beam onto the incident surface of the second optical means for irradiating the second projection area with the light forming the second image;
Control means for controlling the first scanning means and the second scanning means,
A light shielding portion arranged around the first optical means and the second optical means,
Equipped with
The control unit controls the first scanning unit so that a portion of the first beam corresponding to the first image is scanned on the incident surface of the first optical unit, and the second optical unit is controlled. Controlling the second scanning means such that a portion of the second beam corresponding to the second image is scanned on the entrance surface of the means,
When one reciprocating scan in the main scanning direction of the first scanning means and the second scanning means is one cycle, the scanning timings of the first scanning means and the second scanning means are shifted by about 1/4 cycle,
The projection device, wherein the light blocking unit blocks the first beam or the second beam that has not been scanned on the incident surface of the first optical unit or the second optical unit.