JP6850422B2 - Image display device - Google Patents

Description

The present invention relates to the technical field of an image display device such as a head-up display.

Conventionally, image display devices such as head-up displays and laser projectors have been proposed. For example, Patent Document 1 discloses a HUD (Head Up Display) including a display that displays a display image and a combiner that displays a virtual image by injecting light projected from the display. There is.

Such an image display device preferably displays an image so that the image can be observed at a desired viewpoint position (for example, a viewpoint position where visibility is good for the observer). That is, such an image display device preferably displays an image so that an observer located at a desired viewpoint position can observe the image. Therefore, the HUD described in Patent Document 1 moves the combiner in order to display the image at a desired viewpoint position.

In addition to Patent Document 1, Patent Documents 2 to 4 can be mentioned as prior art documents.

Japanese Unexamined Patent Publication No. 2006-062501 Special Table 2007-571254A International Publication No. 2013/153655 Pamphlet Patent No. 5075595

However, in the technique described in Patent Document 1, the image display device needs to move a combiner having a relatively large size in order to display the image so that the image can be observed at a desired viewpoint position. .. Therefore, in the technique described in Patent Document 1, the image display device needs to be newly provided with a relatively complicated and large-sized drive mechanism for moving the combiner. Therefore, there arises a technical problem that the cost and size of the image display device increase.

Examples of the problems to be solved by the present invention are as described above. The present invention provides an image projection device capable of displaying an image so that the image can be observed relatively easily at a desired viewpoint position (for example, a viewpoint position that improves visibility for an observer). The task is to do.

In order to solve the above problems, the image display device is regularly arranged along the emitting means for emitting the laser beam and the scanning surface scanned by the laser beam emitted by the emitting means, and each of the laser beam is emitted. The light formed by the laser beam on the scanning surface so that the laser beam is diffused in a desired diffusion direction by the diffusing means including the plurality of optical elements for diffusing the laser beam and each of the plurality of optical elements. It is provided with an adjusting means for adjusting the formation position of the spot with respect to each of the plurality of optical elements.
The adjusting means displays the first light spot formed by the laser beam for displaying the first image and the second image by adjusting the shift amount of the formation position of the light spot with respect to the optical element. The second light spot formed by the laser beam is formed at a position separated from the second light spot in the direction intersecting the scanning direction of the laser beam so that the first image can be observed at the first viewpoint position. Can be observed at a second viewpoint position different from the first viewpoint position.

It is a block diagram which shows the structure of the image display device of this Example. It is a plan view which shows the screen observed from the direction (Z-axis direction) along the optical path of a laser beam, and the II-II'cross-sectional view of a screen. A plan view showing a scanning position detection plate observed from the direction along the optical path of the laser beam, at the center of the lens surface of the microlens showing the positional relationship between the microlens provided on the screen and the light receiving element provided on the scanning position detection plate. On the other hand, the microlens and the light receiving state show the state of receiving the laser light transmitted through the microlens by the light receiving element when the center of the laser spot is deviated and not deviated along the direction intersecting the scanning direction of the laser light. It is a cross-sectional view of an element, and the graph which shows the relationship between the difference signal output from a pair of light receiving elements, and the shift amount (shift amount) of the center of a laser spot with respect to the center of a lens surface of a microlens. It is explanatory drawing which shows the state of diffusion of the laser light LB by the screen when the diffusion angle of the laser light in each microlens is relatively small and large. It is explanatory drawing which shows the relationship between the shift amount of the formation position of the beam spot along the direction intersecting the scanning direction of a laser beam LB with respect to the center of the lens surface of a microlens, and the diffusion direction of a laser beam in each microlens. It is explanatory drawing which shows the formation position of the beam spot with respect to the center of the lens surface of a microlens when an image display apparatus displays an image which can be observed from a desired viewpoint position. It is explanatory drawing which shows the formation position of the beam spot with respect to the center of the lens surface of a microlens when an image display apparatus displays an image which can be observed from a desired viewpoint position. It is explanatory drawing which shows the example which displays the image at a plurality of viewpoint positions. It is explanatory drawing which shows the example which displays the image at a plurality of viewpoint positions.

Hereinafter, embodiments of the image display device will be described in order.

<1>
The image display device of the present embodiment has a plurality of emitting means for emitting the laser beam and a plurality of emitting means for emitting the laser beam, each of which is regularly arranged along the scanning surface scanned by the laser beam and diffuses the laser beam. The light spot formed by the laser beam on the scanning surface so that the laser beam is diffused in a desired diffusion direction by the diffusion means including the optical element and each of the plurality of optical elements. It is provided with an adjusting means for adjusting the formation position of each of the plurality of optical elements.

According to the image display device of the present embodiment, the emitting means emits a laser beam. A laser beam is a laser beam used to display an image (in other words, to project or draw). The laser beam emitted by the emitting means is applied to the scanning surface so as to scan the scanning surface of the diffusing means. The laser beam draws an intermediate image on the scanning surface by scanning the scanning surface. The laser beam applied to the scanning surface is diffused by each of the plurality of optical elements. The diffused laser light reaches the observer. As a result, the observer can observe the image corresponding to the intermediate image drawn on the scanning surface by the laser beam as a virtual image (or, in some cases, as a real image).

In particular, in the present embodiment, the adjusting means can adjust the formation position of the light spot on the scanning surface. More specifically, the adjusting means adjusts the formation position of the light spot with respect to each of the plurality of optical elements (in other words, the relative positional relationship between each of the plurality of optical elements and the formation position of the light spot). To do.

Here, when the formation position of the light spot with respect to each optical element changes, the diffusion direction of the laser light diffused by each optical element changes. When the diffusion direction of the laser beam changes, the viewpoint position where the image displayed by the laser beam can be observed changes. Conversely, by adjusting the diffusion direction of the laser beam diffused by each optical element, the image can be observed at a desired viewpoint position (for example, a viewpoint position that improves visibility for the observer). It is presumed that the image is displayed as follows.

As described above, the adjustment of the formation position of the light spot on the scanning surface leads to the adjustment of the diffusion direction of the laser beam. Further, the adjustment of the diffusion direction of the laser beam leads to the adjustment of the viewpoint position where the image displayed by the laser beam can be observed. Therefore, the adjusting means can adjust the diffusion direction of the laser beam by adjusting the formation position of the light spot on the scanning surface. As a result, the adjusting means can adjust the viewpoint position where the image displayed by the laser beam can be observed. For example, the adjusting means adjusts the formation position of the light spot on the scanning surface so that the laser beam is diffused in a desired diffusion direction by the diffusing means, so that the image can be observed at a desired viewpoint position. As described above, the viewpoint position at which the image can be observed can be adjusted. As a result, the image display device can display the image so that the image can be observed at a desired viewpoint position (for example, a viewpoint position where the visibility is good for the observer).

<2>
In another aspect of the image display device of the present embodiment, in the adjusting means, the laser light is diffused in a desired direction by the diffusing means, so that the image displayed by the laser light is at a desired viewpoint position. The formation position of the light spot is adjusted so that it can be observed from the above.

According to this aspect, the adjusting means adjusts the formation position of the light spot on the scanning surface so that the laser beam is diffused in the desired diffusion direction by the diffusing means, so that the image can be displayed at the desired viewpoint position. The viewpoint position at which the image can be observed can be adjusted so that the image can be observed.

<3>
In another aspect of the image display device of the present embodiment, the plurality of optical elements are regularly arranged along the scanning direction of the laser beam on the scanning surface, and the adjusting means is the laser beam. The formation position of the light spot is adjusted so that the light spot moves along the direction intersecting the scanning direction of the light spot.

According to this aspect, the adjusting means adjusts the formation position of the light spot so that the light spot moves along the direction intersecting the scanning direction of the laser light, so that the image can be observed at a desired viewpoint position. As described above, the viewpoint position at which the image can be observed can be adjusted.

<4>
In another aspect of the image display device of the present embodiment, a viewpoint position capable of observing a first image portion displayed by the laser beam diffused by the first optical element among the plurality of optical elements, and a viewpoint position. The second image portion displayed by the laser beam diffused by the second optical element different from the first optical element among the plurality of optical elements coincides with or overlaps with the observable viewpoint position. The formation position of the light spot is adjusted so as to be performed.

According to this aspect, the adjusting means can observe the image at a viewpoint position so that the image formed by combining the first image portion and the second image portion can be observed at a desired viewpoint position. Can be adjusted.

<5>
In another aspect of the image display device of the present embodiment, the diameter of the light spot is smaller than the array spacing of two adjacent optical elements among the plurality of optical elements.

When the diameter of the light spot is smaller than the distance between the arrangement of two adjacent optical elements, the adjustment of the formation position of the light spot on the scanning surface is indicated by the adjustment of the diffusion direction of the laser beam (furthermore, the laser beam is used. It leads to or becomes easy to connect to the adjustment of the viewpoint position where the image to be observed can be observed. Therefore, according to this aspect, the adjusting means adjusts the formation position of the light spot having a diameter smaller than the arrangement spacing of the two adjacent optical elements, so that the image displayed by the laser beam can be observed. The position can be adjusted.

Further, according to this aspect, since the diameter of the light spot is relatively small, it is displayed by the laser beam as compared with the case where the diameter of the light spot is not smaller than the arrangement distance of two adjacent optical elements. The brightness of the image is increased. As a result, the image display device can display an image having a relatively large brightness so that it can be observed at a desired viewpoint position. That is, the image display device can appropriately satisfy the requirements of both the brightness of the image and the viewpoint position where the image can be observed.

<6>
In another aspect of the image display device in which the diameter of the light spot is smaller than the distance between the arrangement of two adjacent optical elements as described above, the image displayed by the laser beam is displayed when the formation position of the light spot is not adjusted. Let α be the diffusion angle of the laser light that can be observed from a predetermined viewpoint position, and set the diffusion angle of the laser light that allows the image to be observed from the predetermined viewpoint position when adjusting the formation position of the light spot. Assuming β, the diameter of the light spot is the sequence interval × β / α.

According to this aspect, the adjusting means adjusts the formation position of the light spot having a diameter corresponding to the value obtained by multiplying the array spacing of two adjacent optical elements by β / α. The viewpoint position at which the image displayed by the laser beam can be observed can be adjusted. Further, the brightness of the image displayed by the laser beam is α / β times as large as that in the case where the diameter of the light spot is not smaller than the arrangement interval of two adjacent optical elements. As a result, the image display device can display an image having a relatively large brightness so that it can be observed at a desired viewpoint position.

Such effects and other gains of this embodiment will be further clarified from the examples described below.

As described above, the image display device of the present embodiment includes an emitting means, a diffusing means, and an adjusting means. Therefore, the image can be displayed relatively easily so that the image can be observed at a desired viewpoint position (for example, a viewpoint position where the visibility is good for the observer).

Hereinafter, examples of the image display device will be described with reference to the drawings. In this embodiment, the description will proceed using an example in which the image display device is a head-up display. The head-up display allows the user to observe the image as a virtual image. In other words, the head-up display allows the image to be observed as a virtual image from the position of the user's eyes (so-called eye point). However, the image display device may be any image display device other than the head-up display (for example, a MEMS display, a projector, or the like).

(1) Configuration of Image Display Device 1 First, the configuration of the image display device 1 of this embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of an image display device 1 of this embodiment.

As shown in FIG. 1, the image display device 1 includes a laser light source unit 11 which is a specific example of the “emission means”, a condenser lens 13, and a MEMS mirror 14 which is a specific example of the “adjustment means”. It includes a screen 15, a scanning position detection plate 16, a combiner 17, and a controller 18, which are specific examples of the “diffusion means”.

The laser light source unit 11 emits laser light LB based on an image signal indicating an image to be displayed by the image display device 1 under the control of the laser control unit 181 described later. The laser light source unit 11 emits the laser beam LB toward the MEMS mirror 14 via the condenser lens 13.

Although not shown for simplification of the drawings, the laser light source unit 11 includes a laser diode that emits a red laser beam, a laser diode that emits a green laser beam, and a laser diode that emits a blue laser beam. May be provided. In this case, it is preferable that the three laser beams emitted by the three laser diodes 111 are combined with one laser beam LB by the optical element included in the laser light source unit 11. As a result, the image display device 1 can display a full-color image.

The condenser lens 13 is arranged on the optical path of the laser beam LB between the laser light source unit 11 and the MEMS scanner 14. The condensing lens 13 condenses the laser beam LB emitted by the laser light source unit 11 on the reflecting surface of the MEMS scanner 14.

The MEMS scanner 14 reflects the laser beam LB focused by the condenser lens 13 toward the screen 15. Therefore, the MEMS scanner 14 includes a reflective surface capable of reflecting the laser beam LB toward the screen 15. The reflective surface included in the MEMS scanner 14 is such that the laser beam LB scans the scanning surface 153 of the screen 15 (see FIGS. 2A and 2B) under the control of the MEMS control unit 183 described later. Move far. As a result, the laser beam LB reflected by the MEMS scanner 14 can draw an image (for example, an intermediate image) on the screen 15.

The screen 15 is a transmissive screen through which the laser beam LB reflected by the MEMS scanner 14 is transmitted. Here, the configuration of the screen 15 will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A is a plan view showing the screen 15 observed from the direction (Z-axis direction) along the optical path of the laser beam LB. FIG. 2B is a cross-sectional view taken along the line II-II'of the screen shown in FIG. 2A. In FIGS. 2A and 2B, for convenience of explanation, the screen 15 will be described using an XYZ coordinate system composed of X-axis, Y-axis, and Z-axis which are orthogonal to each other.

As shown in FIGS. 2 (a) and 2 (b), the screen 15 is a plate-shaped member to which the laser light LB is irradiated (in other words, the laser light LB1 scans). However, the screen 15 may be a member having a shape different from the plate shape (for example, a disk shape).

The screen 15 includes a microlens array 151 in which a plurality of microlenses 152 are arranged. As shown in FIG. 2B, each microlens 152 diffuses (in other words, disperses) the laser beam LB incident on the lens surface of the microlens 152. Therefore, the microlens array 151 diffuses the laser beam LB at a diffusion angle determined according to the curvature of the microlens 152 constituting the microlens array 151.

The microlens array 151 is regularly (in other words, periodically) arranged along the scanning direction (Y-axis direction in FIG. 2) of the laser beam LB indicated by the dotted arrow in FIG. 2 (a). Includes a plurality of microlenses 152. The lens group consisting of a plurality of microlenses 152 regularly arranged along the scanning direction of the laser beam LB is X in the direction intersecting the scanning direction of the laser beam LB (in FIGS. 2A and 2B). It is arranged along the axial direction). That is, the plurality of microlenses 152 are arranged in a matrix or a grid pattern.

The outer shape of each lens surface of the plurality of microlenses 152 is a regular hexagon in a plan view (that is, in an XY plane). However, the outer shape of at least one lens surface of the plurality of microlenses 152 has an arbitrary shape other than a regular hexagon in a plan view (for example, a circle, a quadrangle, an arbitrary rectangle, or any other shape). There may be.

The characteristics of the plurality of microlenses 152 (for example, the outer shape and curvature of the lens surface) are the same. However, the characteristics of at least a part of the plurality of microlenses 152 may be different from the characteristics of at least a part of the plurality of microlenses 152.

The shape of one lens surface of each microlens 152 is a convex lens shape. The shape of the other lens surface of each microlens 152 is planar.

The plurality of microlenses 152 are arranged so that the lens surface of each microlens 152 intersects the optical path of the laser beam LB. Therefore, the lens surface of the plurality of microlens arrays 152 (particularly, the lens surface irradiated with the laser beam LB) constitutes the scanning surface 153 scanned by the laser beam LB. Therefore, the scanning surface 153 becomes a surface that intersects the optical path of the laser beam LB.

The laser beam LB irradiated on the scanning surface 153 forms a laser spot LS on the scanning surface 153. The laser spot LS moves with the scanning of the laser beam LB. For example, the laser beam LB scans the scanning surface 153 so that it is sequentially diffused by the plurality of microlenses 152. In this case, the laser spot LS moves so as to be sequentially located on the lens surface of the plurality of microlenses 152 as the laser beam LB is scanned.

The spot diameter of the laser spot LS is smaller than the array spacing of two adjacent microlenses 152. Therefore, the laser light source unit 11 may emit an appropriate laser beam LB so that the spot diameter of the laser spot LS is smaller than the array spacing of the two adjacent microlenses 152. Alternatively, the image display device 1 is an optical element that adjusts the beam diameter of the laser beam LB emitted by the laser light source unit 11 so that the spot diameter of the laser spot LS is smaller than the arrangement interval of the two adjacent microlenses 152. (For example, a beam expander) may be provided.

Again, in FIG. 1, the scanning position detection plate 16 is a member arranged so as to be adjacent to the screen 15 along the optical path of the laser beam LB. The scanning position detection plate 16 is a member that detects the scanning position of the laser beam LB on the screen 15. That is, the scanning position detection plate 16 is a member that detects the formation position of the laser spot LS on the scanning surface 153 of the screen 15.

Here, the configuration of the scanning position detection plate 16 will be described with reference to FIGS. 3A to 3E. FIG. 3A is a plan view showing the scanning position detection plate 16 observed from the direction along the optical path of the laser beam LB. FIG. 3B is a cross-sectional view of the microlens 152 and the light receiving element 162 showing the positional relationship between the microlens 152 included in the screen 15 and the light receiving element 162 included in the scanning position detection plate 16. FIG. 3C shows the laser light transmitted through the microlens 152 when the center of the laser spot LS is not deviated along the direction intersecting the scanning direction of the laser light LB with respect to the center of the lens surface of the microlens 152. It is sectional drawing of the microlens 152 and the light receiving element 162 which shows the state of light receiving by the light receiving element 162 of LB. FIG. 3D shows a laser transmitted through the microlens 152 when the center of the laser spot LS is deviated along the direction intersecting the scanning direction of the laser beam LB with respect to the center of the lens surface of each microlens 152. It is sectional drawing of the microlens 152 and the light receiving element 162 which shows the state of light receiving by the light receiving element 162 of an optical LB. FIG. 3E is a graph showing the relationship between the difference signal output from the pair of light receiving elements 162 and the shift amount (shift amount) of the center of the laser spot LS with respect to the center of the lens surface of the microlens 152. In FIG. 3, the scanning position detection plate 16 will be described using the XYZ coordinate system composed of the X-axis, the Y-axis, and the Z-axis that are orthogonal to each other for convenience of explanation, as in the description of the screen 15.

As shown in FIG. 3A, the scanning position detection plate 16 is a plate-shaped member. However, the scanning position detection plate 16 may be a member having a shape different from the plate shape (for example, a disk shape).

The scanning position detection plate 16 is arranged so that the detection surface 161 of the surface of the scanning position detection plate 16 facing the screen 15 is parallel to the scanning surface 153 of the screen 15. A plurality of light receiving elements 162 arranged along a direction (X-axis direction) intersecting the scanning direction of the laser beam LB are arranged in at least a part of the detection surface 161 of the scanning position detection plate 16. There is. In the example shown in FIG. 2, both ends of the microlens array 151 (scanning surface 153) along the scanning direction (Y-axis direction) of the laser beam LB overlap each other along the optical path (Z-axis direction) of the laser beam LB. A plurality of light receiving elements 162 arranged along a direction (X-axis direction) intersecting the scanning direction of the laser beam LB are arranged in a part of the detection surface 161.

The plurality of light receiving elements 162 are arranged so as to have a predetermined positional relationship with the plurality of microlenses 152. Specifically, as shown in FIG. 3B, a pair of light receiving elements 162 adjacent to each other along a direction (X-axis direction) intersecting the scanning direction of the laser beam LB corresponds to one microlens array 152. A plurality of light receiving elements 162 are arranged therein. In other words, as shown in FIG. 3B, a pair of light receiving elements 162 and one microlens array 152 adjacent to each other along a direction (X-axis direction) intersecting the scanning direction of the laser light LB are formed on the laser light LB. A plurality of light receiving elements 162 are arranged so as to be adjacent to each other along the optical path (Z-axis direction). In particular, a plurality of light receiving elements 162 are arranged so that the center of the lens surface of each microlens 152 and the boundary line of the pair of light receiving elements 162 are aligned along the optical path of the laser light LB.

Since the plurality of light receiving elements 162 are arranged so as to have a predetermined positional relationship with the plurality of microlenses 152, the laser beam LB is based on the light receiving results of the pair of light receiving elements 162 corresponding to each microlens 152. The formation position of the laser spot LS for each microlens 152 along the direction intersecting the scanning direction is detected. Specifically, as shown in FIG. 3C, when the center of the laser spot LS is not deviated along the direction intersecting the scanning direction of the laser beam LB with respect to the center of the lens surface of each microlens 152. Is, the laser beam LB is evenly applied to the pair of light receiving elements 162 corresponding to each microlens 152. Therefore, the signal level of the difference signal (so-called push-pull signal) of the light receiving result of the pair of light receiving elements 162 corresponding to each microlens 152 becomes zero. On the other hand, as shown in FIG. 3D, when the center of the laser spot LS is deviated along the direction intersecting the scanning direction of the laser beam LB with respect to the center of the lens surface of each microlens 152, The laser beam LB does not evenly irradiate the pair of light receiving elements 162 corresponding to each microlens 152. Therefore, the signal level of the difference signal of the light receiving result of the pair of light receiving elements 162 corresponding to each microlens 152 does not become zero.

Therefore, as shown in FIG. 3E, the signal level of the difference signal is the signal level of the laser spot LS along the direction intersecting the scanning direction of the laser beam LB with reference to the center of the lens surface of each microlens 152. The signal level corresponds to the shift amount (shift amount) at the center. That is, the signal level of the difference signal is a signal level according to the formation position of the laser spot LS for each microlens 152 along the direction intersecting the scanning direction of the laser beam LB. Therefore, the formation position of the laser spot LS for each microlens 152 along the direction intersecting the scanning direction of the laser beam LB based on the signal level of the difference signal of the light receiving result of the pair of light receiving elements 162 corresponding to each microlens 152. Is detected. Conversely, when the control to match the signal level of the difference signal with the desired signal level is performed, the formation position of the laser spot LS is adjusted along the direction intersecting the scanning direction of the laser beam LB.

In addition, in FIGS. 3A to 3E, a pair of light receiving elements 162 adjacent to each other along the direction (X-axis direction) intersecting the scanning direction of the laser beam LB correspond to one microlens array 152. A plurality of light receiving elements 162 are arranged therein. In this case, as described above, the amount of shift of the center of the laser spot LS along the direction intersecting the scanning direction of the laser beam LB with respect to the center of the lens surface of each microlens 152 based on the signal level of the difference signal. Is detected. On the other hand, a plurality of light receiving elements 162 are arranged so that four light receiving elements 162 adjacent to each other in a grid pattern along the scanning direction of the laser beam LB and the direction intersecting the scanning directions correspond to one microlens array 152. You may be. In this case, the shift amount of the center of the laser spot LS along an arbitrary direction with respect to the center of the lens surface of each microlens 152 is detected based on the signal level of the difference signal.

Again, in FIG. 1, the combiner 17 reflects the laser beam LB (ie, diffused light) transmitted through the screen 15 toward the observer. As a result, the observer can observe the image displayed by the laser beam LB transmitted through the screen 15 (in other words, the image formed by the laser beam LB on the screen 15) as a virtual image.

The controller 18 is a central processing unit that controls the image display device 1. In this embodiment, in particular, the controller 18 includes a laser control unit 181 and a MEMS control unit 183 which is a specific example of the "adjustment means" as a logical processing block realized inside the controller 18.

The laser control unit 181 controls the laser light source unit 11. Specifically, the laser control unit 181 determines the emission pattern of the laser light LB by the laser light source unit 11 based on the image signal. After that, the laser control unit 181 controls the laser light source unit 11 so as to emit the laser beam LB with the determined emission pattern while synchronizing with the deviation timing of the MEMS scanner 14 that moves far under the control of the MEMS control unit 183. To do.

The MEMS control unit 183 controls the MEMS scanner 14. Specifically, the MEMS control unit 183 controls the MEMS scanner 14 so that the MEMS scanner 14 moves far while synchronizing with the emission pattern of the laser light LB by the laser light source unit 11. That is, the MEMS control unit 183 controls the MEMS scanner 14 so that the laser beam LB reflected by the MEMS scanner 14 appropriately scans the scanning surface 153 of the screen 15.

In addition, the MEMS control unit 183 controls the MEMS scanner 14 so as to adjust the formation position of the laser spot LS on the scanning surface 153 based on the detection result of the scanning position detection unit 16. More specifically, the MEMS control unit 183 scans the laser spot LS formation position (for example, scanning the laser light LB) along the direction intersecting the scanning direction of the laser light LB based on the detection result of the scanning position detection unit 16. The MEMS scanner 14 is controlled so as to adjust the formation position of the laser spot LS with respect to each microlens 152 along the direction intersecting the directions. In this case, the MEMS control unit 183 adjusts the formation position of the laser spot LS by, for example, adjusting the distance movement mode (for example, the distance movement timing, the distance movement angle, the distance movement amount, etc.) of the MEMS scanner 14. The MEMS scanner 14 is controlled in this way. The operation of adjusting the formation position of the laser spot LS performed under the control of the MEMS control unit 182 will be described in detail later (see FIGS. 5 (a) to 5 (e)).

(2) Relationship between the brightness of the image and the viewpoint position where the image can be observed Next, the brightness of the image displayed by the laser beam LB diffused by the screen 15 and the image can be observed with reference to FIG. The relationship with the viewpoint position will be explained. FIG. 4A is an explanatory diagram showing the state of diffusion of the laser beam LB by the screen 15 when the diffusion angle of the laser beam LB in each microlens 152 is relatively small. FIG. 4B is an explanatory diagram showing a state of diffusion of the laser beam LB by the screen 15 when the diffusion angle of the laser beam LB in each microlens 152 is relatively large.

As shown in FIG. 4A, when the diffusion angle of the laser beam LB in each microlens 152 is relatively small, each microlens 152 diffuses the laser beam LB toward a relatively narrow range. .. When the diffusion angle of the laser light LB is relatively small (that is, each microlens 152 diffuses the laser light LB toward a relatively narrow range), the laser light LB reaches the observer located at a certain viewpoint position. The amount of light is relatively large. When the amount of light of the laser light LB reaching the observer becomes relatively large, the observer recognizes that the brightness of the image displayed by the laser light LB is relatively large (that is, relatively high).

However, when the diffusion angle of the laser beam LB in each of the microlenses 152 is relatively small, the region reached by all the laser beams diffused by the plurality of microlenses 152 included in the screen 15 is relatively narrow. That is, when the diffusion angle of the laser beam LB in each microlens 152 is relatively small, the viewpoint position where the entire image displayed by the laser beam LB diffused by the screen 15 can be observed is in a relatively narrow range. Will be distributed in. For example, in the example shown in FIG. 4A, at the viewpoint position A1, all of the laser light diffused by the plurality of microlenses 152 included in the screen 15 reaches, so that the laser light LB diffused by the screen 15 reaches the viewpoint position A1. The entire displayed image is observable. On the other hand, at the viewpoint position A2, the laser beam LB diffused by some of the microlenses 152 corresponding to the pixels D and E among the plurality of microlenses 152 included in the screen 15 does not reach. In other words, at the viewpoint position A2, the laser LB does not reach while the laser beam LB is scanning a part of the microlenses 152 corresponding to the pixels D and the pixel E. Therefore, at the viewpoint position A2, the entire image displayed by the laser beam LB diffused by the screen 15 cannot be observed. Typically, at the viewpoint position A2, a part of the image displayed by the laser beam LB diffused by the screen 15 (for example, an image lacking pixels D and E) is observed.

In this way, when the diffusion angle of the laser light LB in each microlens 152 becomes relatively small, the brightness of the image displayed by the laser light LB becomes relatively large, but the image displayed by the laser light LB is observed. Possible viewpoint positions are distributed in a relatively narrow range. Therefore, the observer observing the image displayed by the image display device 1 needs to adjust the viewpoint of the observer to the viewpoint position distributed in a relatively narrow range (that is, the viewpoint position where the image can be observed). Be constrained. In other words, it may be difficult for an observer who observes the image displayed by the image display device 1 to observe the image from a desired viewpoint position.

Therefore, in order to widen the distribution range of the viewpoint position where the image displayed by the laser light LB can be observed, a countermeasure for relatively increasing the diffusion angle of the laser light LB in each microlens 152 is assumed. The diffusion angle of the laser beam LB in each microlens 152 increases as the spot diameter of the laser spot LS increases.

In this case, as shown in FIG. 4B, the area reached by all of the laser light diffused by the plurality of microlenses 152 included in the screen 15 is relatively wide. That is, when the diffusion angle of the laser beam LB in each microlens 152 is relatively large, the viewpoint position where the entire image displayed by the laser beam LB diffused by the screen 15 can be observed is relatively. It will be distributed over a wide range. For example, in the example shown in FIG. 4B, at the viewpoint position B1, all of the laser light diffused by the plurality of microlenses 152 included in the screen 15 reaches, so that the laser light LB diffused by the screen 15 reaches the viewpoint position B1. The entire displayed image is observable. As can be seen by comparing FIGS. 4 (a) and 4 (b), the distribution range of the viewpoint position B1 is wider than the distribution range of the viewpoint position A1.

However, when the diffusion angle of the laser beam LB in each microlens 152 is relatively large, each microlens 152 diffuses the laser beam LB toward a relatively wide range. When the diffusion angle of the laser light LB is relatively large (that is, each microlens 152 diffuses the laser light LB toward a relatively wide range), the laser light LB reaches the observer located at a certain viewpoint position. The amount of light is relatively small. When the amount of light of the laser light LB reaching the observer is relatively small, the observer recognizes that the brightness of the image displayed by the laser light LB is relatively low (that is, relatively low).

In this way, when the diffusion angle of the laser light LB in each microlens 152 becomes relatively large, the viewpoint position where the image displayed by the laser light LB can be observed is distributed in a relatively wide range, but the laser light LB The brightness of the image displayed by is relatively low. Therefore, the observer may observe a relatively dark image.

That is, it is difficult for the image display device 1 to display an image having a relatively high brightness and observable from a desired viewpoint position only by adjusting the diffusion angle of the laser beam LB in each microlens 152. Presumed to be.

Therefore, the image display device 1 of the present embodiment first maintains a state in which the diffusion angle of the laser beam LB in each microlens 152 is relatively small (for example, two microlenses adjacent to each other with the spot diameters of the laser spot LS). By making it smaller than the arrangement pitch of 152 (or the diameter of the lens surface of each microlens 152), the brightness of the displayed image is increased. Then, the image display device 1 displays an image observable from a desired viewpoint position by adjusting the diffusion direction of the laser beam LB in each microlens 152. As a result, the image display device 1 can display an image having a relatively high brightness and observable from a desired viewpoint position.

In order to adjust the diffusion direction of the laser beam LB in each microlens 152, the image display device 1 forms a laser spot LS formation position (for example, the scanning direction of the laser beam LB) along a direction intersecting the scanning direction of the laser beam LB. The formation position of the laser spot LS with respect to each microlens 152 along the direction of intersection) is adjusted.

Hereinafter, the operation of adjusting the formation position of the laser spot LS, which is performed to adjust the diffusion direction of the laser beam LB in each of the microlenses 152, will be further described.

(3) Adjustment operation of the formation position of the laser spot LS by the MEMS control unit 183 Subsequently, with reference to FIGS. 5 (a) to 5 (b) and FIGS. 6 and 7, the laser spot LS by the MEMS control unit 183. The operation of adjusting the forming position of the laser will be described. 5 (a) to 5 (e) show the amount of shift of the beam spot LS formation position along the direction intersecting the scanning direction of the laser beam LB with respect to the center of the lens surface of the microlens 152, and each microlens 152. It is explanatory drawing which shows the relationship with the diffusion direction of a laser beam LB in. FIG. 6 is an explanatory diagram showing a position where the beam spot LS is formed with respect to the center of the lens surface of the microlens 152 when the image display device 1 displays an image observable from the desired viewpoint position # 6. FIG. 7 is an explanatory diagram showing a position where the beam spot LS is formed with respect to the center of the lens surface of the microlens 152 when the image display device 1 displays an image observable from the desired viewpoint position # 7.

As shown in FIGS. 5A to 5E, the laser light in each microlens 152 depends on the formation position of the laser spot LS for each microlens 152 along the direction intersecting the scanning direction of the laser light LB. The diffusion direction of LB changes. More specifically, when the laser beam LB is irradiated to the microlens 152, the laser spot LS is formed according to the direction intersecting the scanning direction of the laser beam LB with respect to the microlens 152. , The diffusion direction of the laser beam LB in the certain microlens 152 changes. Hereinafter, the description will be given by taking as an example the case where the microlens 152 # 5 is irradiated with the laser beam LB.

For example, as shown on the left side of FIG. 5A, the shift amount of the beam spot LS formation position along the direction intersecting the scanning direction of the laser beam LB with respect to the center of the lens surface of the microlens 152 # 5 is −d1. Imagine that it is. In addition, in FIGS. 5A to 5E, the shift toward the right side with respect to the traveling direction of the laser beam LB (the direction from the left side to the right side in the drawings in FIGS. 5A to 5E). A quantity (in FIGS. 5 (a) to 5 (e), a shift amount toward the lower side of the drawing) is defined as a positive shift amount. In this case, as shown in the center of FIG. 5A, the diffusion direction of the laser beam LB in the microlens 152 # 5 is the first direction D1.

The right side of FIG. 5A shows the diffusion of the laser beam LB scanning along one scanning line on the scanning surface 153 under the condition that the shift amount of the formation position of the beam spot LS is −d1. The distribution of angles (that is, the diffusion distribution of the laser beam LB by the screen 15) is shown. That is, on the right side of FIG. 5A, the laser beam LB scanning along one scanning line on the scanning surface 153 under the condition that the shift amount of the formation position of the beam spot LS is −d1 is screened. The projection distribution of the laser beam LB on the projection plane when it is diffused by 15 and then projected on the virtual projection plane is shown. Therefore, on the right side of FIG. 5A, the region reached by the laser beam LB (relatively bright region) indicates the viewpoint position where the image displayed by the laser beam LB can be observed. The right side of each of FIGS. 5 (b) to 5 (e) below is the same laser beam LB as the right side of FIG. 5 (a) except that the shift amount of the formation position of the beam spot LS is different. The distribution of the diffusion angle of is shown.

Subsequently, as shown on the left side of FIG. 5B, the MEMS control unit 183 changes the shift amount of the formation position of the beam spot LS from −d1 to −d2 (however, d1> d2). It is assumed that 14 distant movement modes are adjusted. In this case, as shown in the center of FIG. 5B, the diffusion direction of the laser beam LB in the microlens 152 # 5 changes to the second direction D2 different from the first direction D1. As a result, as shown on the right side of FIG. 5B, the region where the laser beam diffused by the microlens 152 # 5 reaches (that is, the viewpoint position where the image displayed by the laser beam LB can be observed is observable. ) Also changes.

Subsequently, as shown on the left side of FIG. 5C, the MEMS control unit 183 adjusted the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS changed from −d2 to 0. Imagine a case. In this case, as shown in the center of FIG. 5C, the diffusion direction of the laser beam LB in the microlens 152 # 5 changes to a third direction D3 different from the first direction D1 and the second direction D2. .. As a result, as shown on the right side of FIG. 5C, the region where the laser beam diffused by the microlens 152 # 5 reaches (that is, the viewpoint position where the image displayed by the laser beam LB can be observed is observable. ) Also changes.

Subsequently, as shown on the left side of FIG. 5D, when the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS changes from 0 to + d2. Is assumed. In this case, as shown in the center of FIG. 5D, the diffusion direction of the laser beam LB in the microlens 152 # 5 changes from the first direction D1 to the fourth direction D4 different from the third direction D3. .. As a result, as shown on the right side of FIG. 5D, the region where the laser beam diffused by the microlens 152 # 5 reaches (that is, the viewpoint position where the image displayed by the laser beam LB can be observed is observable. ) Also changes.

Subsequently, as shown on the left side of FIG. 5E, when the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS changes from + d2 to + d1. Is assumed. In this case, as shown in the center of FIG. 5 (e), the diffusion direction of the laser beam LB in the microlens 152 # 5 changes from the first direction D1 to the fifth direction D5 different from the fourth direction D4. .. As a result, as shown on the right side of FIG. 5 (e), the region where the laser beam diffused by the microlens 152 # 5 reaches (that is, the viewpoint position where the image displayed by the laser beam LB can be observed is observable. ) Also changes.

As described above, it can be seen that the diffusion direction of the laser light LB in each microlens 152 changes according to the formation position of the laser spot LS with respect to each microlens 152 along the direction intersecting the scanning direction of the laser light LB. Then, conversely, if the formation position of the laser spot LS is adjusted for each microlens 152, each microlens 152 can diffuse the laser beam LB in a desired diffusion direction corresponding to a desired viewpoint position. Is assumed.

For example, as shown in FIG. 6, it is assumed that the image display device 1 displays an image observable from the viewpoint position # 6.

In this case, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # A corresponding to the pixel A is −d61. In this case, the microlens 152 # A has the laser beam LB in the diffusion direction # 6A corresponding to the viewpoint position # 6 (that is, the diffusion direction # 6A in which the laser beam LB can reach the viewpoint position # 6). To spread.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # B corresponding to the pixel B is −d62. In this case, the microlens 152 # B is directed to the diffusion direction # 6B corresponding to the viewpoint position # 6 (that is, the diffusion direction # 6B at which the laser light LB can reach the viewpoint position # 6). To spread.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # C corresponding to the pixel C becomes zero. In this case, the microlens 152 # C has the laser beam LB in the diffusion direction # 6C corresponding to the viewpoint position # 6 (that is, the diffusion direction # 6C in which the laser beam LB can reach the viewpoint position # 6). To spread.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # D corresponding to the pixel D is + d62. In this case, the microlens 152 # D is directed to the diffusion direction # 6D corresponding to the viewpoint position # 6 (that is, the diffusion direction # 6D at which the laser light LB can reach the viewpoint position # 6). To spread.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # E corresponding to the pixel E is + d61. In this case, the microlens 152 # E is directed to the diffusion direction # 6E corresponding to the viewpoint position # 6 (that is, the diffusion direction # 6E at which the laser light LB can reach the viewpoint position # 6). To spread.

For all other microlenses 152, the MEMS control unit 183 also has a beam spot with respect to the other microlens 152 so that the other microlens 152 diffuses the laser beam LB in the diffusion direction corresponding to the viewpoint position # 6. The moving mode of the MEMS scanner 14 is adjusted so that the shift amount of the LS forming position becomes a predetermined amount.

As a result, all of the laser light diffused by the plurality of microlenses 152 included in the screen 15 reaches the viewpoint position # 6. Therefore, the observer located at the viewpoint position # 6 can observe the entire image displayed by the laser beam LB diffused by the screen 15. That is, the image display device 1 can display an image that can be observed from the viewpoint position # 6.

On the other hand, for example, as shown in FIG. 7, the image display device 1 replaces the image observable from the viewpoint position # 6 with a new image observable from the viewpoint position # 7 different from the viewpoint position # 6. It is assumed that it will be displayed.

In this case, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # A corresponding to the pixel A changes from −d61 to −d71. In this case, the microlens 152 # A is directed toward the diffusion direction # 7A corresponding to the viewpoint position # 7 (that is, the diffusion direction # 7A capable of reaching the viewpoint position # 7 with the laser beam LB). Diffuses light LB.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # B corresponding to the pixel B changes from −d62 to −d72. In this case, the microlens 152 # B is directed to the diffusion direction # 7B corresponding to the viewpoint position # 7 (that is, the diffusion direction # 7B at which the laser light LB can reach the viewpoint position # 7). To spread.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # C corresponding to the pixel C changes from 0 to −d73. In this case, the microlens 152 # C has the laser beam LB in the diffusion direction # 7C corresponding to the viewpoint position # 7 (that is, the diffusion direction # 7C in which the laser beam LB can reach the viewpoint position # 7). To spread.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # D corresponding to the pixel D changes from + d62 to −d74. In this case, the microlens 152 # D is directed to the diffusion direction # 7D corresponding to the viewpoint position # 7 (that is, the diffusion direction # 7D at which the laser light LB can reach the viewpoint position # 7). To spread.

Similarly, the MEMS control unit 183 adjusts the moving mode of the MEMS scanner 14 so that the shift amount of the formation position of the beam spot LS with respect to the microlens 152 # E corresponding to the pixel E changes from + d61 to −d75. In this case, the microlens 152 # E is directed to the diffusion direction # 7E corresponding to the viewpoint position # 7 (that is, the diffusion direction # 7E at which the laser light LB can reach the viewpoint position # 7). To spread.

For all other microlenses 152, the MEMS control unit 183 also has a beam spot with respect to the other microlens 152 so that the other microlens 152 diffuses the laser beam LB in the diffusion direction corresponding to the viewpoint position # 7. The moving mode of the MEMS scanner 14 is adjusted so that the shift amount of the LS forming position becomes a predetermined amount.

As a result, all of the laser light diffused by the plurality of microlenses 152 included in the screen 15 reaches the viewpoint position # 7. Therefore, the observer located at the viewpoint position # 7 can observe the entire image displayed by the laser beam LB diffused by the screen 15. Alternatively, even if the observer's viewpoint moves from the viewpoint position # 6 to the viewpoint position # 7, the observer still observes the entire image displayed by the laser beam LB diffused by the screen 15. Can be done.

As described above, the image display device 1 of the present embodiment can increase the brightness of the displayed image mainly by maintaining the state in which the diffusion angle of the laser beam LB in each microlens 152 is relatively small. .. Further, the image display device 1 of the present embodiment can display an image observable from a desired viewpoint position mainly by adjusting the diffusion direction of the laser beam LB in each microlens 152. That is, the image display device 1 of the present embodiment substantially distributes the viewpoint position where the image can be observed in a relatively wide range by mainly adjusting the diffusion direction of the laser beam LB in each microlens 152. Can be made to. As a result, the image display device 1 can display an image having a relatively high brightness and observable from a desired viewpoint position.

The adjustment of the formation position of the laser spot LS leads to the adjustment of the diffusion direction of the laser beam LB in the microlens 152, typically when the spot diameter of the laser spot LS is smaller than the arrangement pitch of the microlens 152. Is. That is, when the spot diameter of the laser spot LS is larger than the arrangement pitch of the microlens 152, the adjustment of the formation position of the laser spot LS does not lead to the adjustment of the diffusion direction of the laser beam LB in the microlens 152, or is difficult to connect. Therefore, in addition to or instead of increasing the brightness of the image, the laser spot LS is also used for the purpose of adjusting the diffusion direction of the laser beam LB in the microlens 152 by adjusting the formation position of the laser spot LS. The spot diameter of the microlens 152 is preferably smaller than the arrangement pitch of the microlens 152.

Here, the diffusion angle of the laser beam LB in the microlens 152 when the image display device 1 displays an image observable from a certain viewpoint position is defined as β. On the other hand, the diffusion angle of the laser beam LB in the microlens 152 when the image display device of the comparative example that does not adjust the formation position of the laser spot LS displays an image that can be observed from the same viewpoint position is defined as α. .. In this case, it is preferable that the spot diameter of the laser spot LS and the arrangement pitch of the microlens 152 have a relationship of the spot diameter of the laser spot LS = the arrangement pitch of the microlens 152 × (β / α). In this case, both the image display device 1 and the image display device of the comparative example can display an image that can be observed from a certain viewpoint position. On the other hand, the brightness of the image displayed by the image display device 1 is (α / β) times the brightness of the image displayed by the image display device of the comparative example. Therefore, the image display device 1 can display an image observable from a certain viewpoint position with a relatively large brightness as compared with the image display device of the comparative example.

In addition, in this embodiment, the image display device 1 can display an image observable from a desired viewpoint position by adjusting the moving mode of the MEMS scanner 14. That is, the image display device 1 can display an image that can be observed from a desired viewpoint position without moving a relatively large combiner 17 (or other physical component). Therefore, the relative cost reduction and the relative miniaturization of the image display device 1 are realized.

The configuration and operation of the image display device 1 described with reference to FIGS. 1 to 7 is an example. Therefore, at least a part of the configuration and operation of the image display device 1 may be appropriately modified. Hereinafter, an example of modifying at least a part of the configuration and operation of the image display device 1 will be described.

The MEMS control unit 183 may automatically adjust the moving mode of the MEMS scanner 14 according to the viewpoint position of the observer. For example, the MEMS control unit 183 may automatically adjust the moving mode of the MEMS scanner 14 so as to display an image that can be observed from the viewpoint position of the observer. In this case, it is preferable that the image display device 1 detects the viewpoint position of the observer or acquires information on the viewpoint position of the observer. Alternatively, the MEMS control unit 183 may adjust the moving mode of the MEMS scanner 14 according to the instruction content of the observer who specifies the viewpoint position. For example, the MEMS control unit 183 may adjust the moving mode of the MEMS scanner 14 so as to display an observable image from a viewpoint position designated by the observer.

The screen 15 described above is a transmissive screen that transmits the laser beam LB. However, a reflective screen that reflects the laser beam LB may be used as the screen 15.

In addition to or in place of the microlens array 151, the screen 15 may include any optical element in which element portions or element regions capable of diffusing the laser beam LB are periodically arranged. In addition to or in place of the microlens array 151, the screen 15 may be any optical element in which element portions or element regions capable of diffusing the laser beam LB are periodically arranged. As such an optical element, for example, a diffractive optical element (DOE) can be mentioned as an example.

In addition to or instead of displaying an image at a single viewpoint position, the image display device 1 may display the same or different images at a plurality of viewpoint positions. Hereinafter, an example of displaying an image at a plurality of viewpoint positions will be described with reference to FIGS. 8 and 9. 8 and 9 are explanatory views showing an example of displaying an image at a plurality of viewpoint positions, respectively.

As shown in FIG. 8, in the MEMS control unit 183, the microlenses 152 # A and 152 # B located on one side (upper side in FIG. 8) of the screen 15 correspond to the viewpoint position # 8-1. The shift amount of the formation position of the beam spot LS with respect to each of the microlenses 152 # A and 152 # B may be adjusted so as to diffuse the laser beam LB toward the diffusion direction # 8-1. On the other hand, in the MEMS control unit 183, the microlenses 152 # C, 152 # D and 152 # E located on the relatively opposite side (lower side in FIG. 8) of the screen 15 correspond to the viewpoint position # 8-2. The shift amount of the beam spot LS formation position with respect to each of the microlenses 152 # C, 152 # D and 152 # E may be adjusted so as to diffuse the laser beam LB toward the diffusion direction # 8-2. .. The MEMS control unit 183 also causes the other microlenses 152 to diffuse the laser beam LB in the diffusion direction corresponding to any of the viewpoint positions # 8-1 and # 8-2 for all the other microlenses 152. In addition, the shift amount of the formation position of the beam spot LS with respect to the other microlens 152 may be adjusted. As a result, the image display device # 1 has a first image observable from the viewpoint position # 8-1 and a second image observable from the viewpoint position # 8-2 (however, the second image is the first image. It may be the same as or different from the image of). For example, when the image display device # 1 is mounted on the vehicle, the image display device # 1 has both the viewpoint position # 8-1 corresponding to the driver's seat and the viewpoint position # 8-2 corresponding to the passenger seat. Images for navigation that can be observed from can be displayed substantially at the same time. Alternatively, for example, when the image display device # 1 is mounted on the vehicle, the image display device # 1 has an image corresponding to a speedometer that can be observed from the viewpoint position # 8-1 that is relatively viewed from above. Navigation images that can be observed from the viewpoint position # 8-2 looking up from relatively below can be displayed substantially at the same time.

As shown in FIG. 9, the MEMS control unit 183 has a diffusion direction in which two microlenses 152 adjacent to each other along a direction intersecting the scanning direction of the laser beam LB (vertical direction in FIG. 9) correspond to different viewpoint positions. The shift amount of the formation position of the beam spot LS with respect to the microlens 152 may be adjusted so as to diffuse the laser beam LB toward the lens 152. For example, the MEMS control unit 183 diffuses the laser beam LB toward the diffusion direction # 8-1 corresponding to the viewpoint position # 8-1 so that the microlenses 152 # B and 152 # D diffuse the laser beam LB. And the shift amount of the formation position of the beam spot LS with respect to each of 152 # D may be adjusted. On the other hand, for example, the MEMS control unit 183 causes the microlenses 152 # A, 152 # C and 152 # E to diffuse the laser beam LB in the diffusion direction # 8-2 corresponding to the viewpoint position # 8-2. In addition, the shift amount of the formation position of the beam spot LS with respect to each of the microlenses 152 # A, 152 # C and 152 # E may be adjusted.

Further, the present invention can be appropriately modified within a range not contrary to the gist or idea of the invention that can be read from the claims and the entire specification, and an image display device accompanied by such a modification is also a technical idea of the present invention. include.

1 Image display device 11 Laser light source unit 13 Condensing lens 14 MEMS scanner 15 Screen 151 Microlens array 152 Microlens 153 Scanning surface 16 Scanning position detection plate 161 Detection surface 162 Light receiving element 17 Combiner 18 Controller 181 Laser control unit 183 MEMS control unit LB laser light LS laser spot

Claims (3)

Emission means that emits laser light and
Diffusing means including a plurality of optical elements that are regularly arranged along the scanning surface scanned by the laser beam emitted by the emitting means and each diffuse the laser beam.
The formation position of the light spot formed by the laser beam on the scanning surface with respect to each of the plurality of optical elements so that the laser beam is diffused in a desired diffusion direction by each of the plurality of optical elements. Equipped with adjustment means to adjust
The adjusting means displays the first light spot formed by the laser beam for displaying the first image and the second image by adjusting the shift amount of the formation position of the light spot with respect to the optical element. The second light spot formed by the laser beam is formed at a position separated from the second light spot in the direction intersecting the scanning direction of the laser beam so that the first image can be observed at the first viewpoint position. An image display device characterized in that the light can be observed at a second viewpoint position different from the first viewpoint position. The image display device according to claim 1, wherein the direction intersecting the scanning direction of the laser beam corresponds to the vertical direction. The image display device according to claim 1, wherein the direction intersecting the scanning direction of the laser beam corresponds to the left-right direction.

Images