JP2008219618A - Video display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display apparatus capable of displaying a high-definition video without increasing modulation frequency. <P>SOLUTION: The video display apparatus 1 includes a laser element 2 for applying a laser beam group LA comprising a plurality of laser beams, a movable mirror 3 for raster scanning the laser beam group LA, an optical element 4 for deflecting the laser beam group LB scanned by the movable mirror 3, and a control device 5 for controlling the laser element 2 and the movable mirror 3. The optical element 4 comprises: a lens array in which a plurality of lenses 41 having curvatures only in a main scanning direction SH1 are planarly arranged side by side along the main scanning direction SH1 and a sub-scanning direction. Further, the control device 5 controls irradiation of the laser beams so that the plurality of laser beams display the video viewed from different view points, respectively. Accordingly, the video display apparatus 1 displays a stereoscopic video with multi view points. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video display device that displays a multi-viewpoint video.

  There have been many attempts to display stereoscopic images, and binocular stereoscopic image display devices using polarized glasses and liquid crystal shutter glasses, and glasses-free stereoscopic image display devices using parallax barriers and lenticular lenses have been put to practical use. Has been.

  However, these stereoscopic image display devices display the object in a state different from the case where the observer directly views the object (natural vision). For example, when displaying a stereoscopic image by using a binocular parallax in which two images for the right eye and the left eye are viewed with each eye, unlike natural vision, between the convergence and focus of the left and right eyes. Deviation occurs. For this reason, if an observer continues to visually recognize an image on the stereoscopic display device for a long time, the observer may get tired or may feel uncomfortable depending on the image.

As a stereoscopic image display device for solving such a problem, a polygon mirror for raster scanning laser light from a semiconductor laser, a cylindrical lens array for deflecting raster scanned laser light, and a deflection angle by the cylindrical lens array. Correspondingly, a stereoscopic image provided with a laser light driving circuit that modulates laser light based on a plurality of image data photographed from a plurality of viewpoints so that the plurality of images are projected in respective directions corresponding to the photographing directions. A display device has been proposed (see, for example, Patent Document 1).
JP-A-11-103474

  However, the stereoscopic image display device described in Patent Document 1 displays images from a plurality of viewpoints by laser light from one semiconductor laser. For this reason, when the number of pixels and the number of viewpoints increase, it is necessary to further increase the modulation frequency of the semiconductor laser, and there is a problem that a high-definition image cannot be displayed.

  The present invention has been made in view of these problems, and an object thereof is to provide a video display device capable of displaying a high-definition video without increasing the modulation frequency.

  The image display device according to claim 1, which has been made to achieve the above object, includes a laser irradiation unit having a plurality of light emitting points that independently irradiate laser light, and a laser beam irradiated from the plurality of light emitting points. A scanning unit that performs raster scanning in the main scanning direction and the sub-scanning direction; and a deflection unit that deflects the laser beam raster-scanned by the scanning unit. The control unit is configured to control the laser beam deflected by the deflection unit from a plurality of viewpoints. The laser light irradiation from the plurality of light emitting points by the laser irradiation means is controlled so as to reproduce the viewed image.

  According to the image display device configured as described above, images viewed from a plurality of viewpoints can be reproduced by laser light emitted from a plurality of light emitting points. That is, it is possible to reduce the number of viewpoints for displaying images per light emitting point. For this reason, the modulation frequency at the time of irradiating a laser beam can be made lower than the case where the images viewed from a plurality of viewpoints are reproduced by the laser beam irradiated from one light emitting point. Thereby, if it is the same modulation frequency, a high-definition image | video can be displayed rather than the case where a laser beam is irradiated from one light emission point.

  In the video display device according to claim 1, as described in claim 2, the plurality of light emitting points are aligned in the main scanning direction by the laser light emitted from the plurality of light emitting points toward the deflecting unit. You may make it arrange | position along the 1st arrangement direction irradiated by.

  In the video display device according to claim 1, as described in claim 3, the plurality of light emitting points are arranged such that the laser beams emitted from the plurality of light emitting points are aligned in the main scanning direction toward the deflecting unit. It may be arranged along the first arrangement direction irradiated in step (b) and along the second arrangement direction irradiated side by side in a direction different from the main scanning direction.

  According to a third aspect of the present invention, in the video display device according to the fourth aspect of the present invention, the control means is configured for each of the plurality of viewpoints by the light emitting points arranged along the first arrangement direction among the plurality of light emitting points. And controlling the irradiation of the laser light from the plurality of light emitting points so that the light amount of the image for each of the plurality of viewpoints is adjusted by the light emitting points arranged along the second arrangement direction. Also good.

  According to the video display device configured as described above, it is not necessary to change the amount of light by controlling the number of times of laser light irradiation, so that the modulation frequency at the time of laser light irradiation can be lowered. As a result, if the modulation frequency is the same, it is possible to display a higher-definition image than when changing the light amount by controlling the number of times of laser light irradiation.

Further, in the video display device according to a third aspect, as described in the fifth aspect, a light emitting point for irradiating laser beams having different wavelengths may be arranged along the second arrangement direction.
According to the image display device configured as described above, a color image can be displayed by controlling the combination of irradiation with laser beams having different wavelengths.

  According to a fifth aspect of the present invention, there is provided the image display device according to the sixth aspect, wherein the light quantity of the image is adjusted along the second arrangement direction for each light emitting point where the laser beams having different wavelengths are irradiated. The light emitting points may be arranged.

  According to the video display device configured as described above, it is not necessary to change the amount of light by controlling the number of times of laser light irradiation, so that the modulation frequency at the time of laser light irradiation can be lowered. Thus, if the modulation frequency is the same, a higher-definition color image can be displayed than when the amount of light is changed by controlling the number of times of laser light irradiation.

  In general, each pixel constituting the display screen forms a rectangular area composed of a side along the main scanning direction and a side along a direction substantially orthogonal to the main scanning direction. Accordingly, in the video display device according to any one of claims 3 to 6, when the direction different from the main scanning direction is a direction substantially orthogonal to the main scanning direction, as described in claim 7. Good.

  According to the video display device configured as described above, it is possible to irradiate laser beams in a state where they are arranged in the main scanning direction and in a direction substantially orthogonal to the main scanning direction, that is, in a state of being arranged in a rectangular shape.

  Thereby, when the area of the rectangle formed by the irradiated laser beam and the area of the rectangular pixel are substantially equal, the laser beam can be irradiated without protruding from the pixel configured in the rectangular shape. On the other hand, some laser beams irradiated in a state aligned in the main scanning direction and in a direction non-orthogonal to the main scanning direction deviate from the pixels and are irradiated unnecessarily.

  Therefore, when the laser is irradiated over substantially the entire surface of the rectangular pixel, there is no emission point for irradiating the laser beam wastefully, and the laser beam can be irradiated efficiently, so a higher definition image is displayed. can do.

  Further, in the video display device according to any one of claims 2 to 7, as described in claim 8, the deflecting unit includes a lens array having a curvature in the main scanning direction. A viewing zone in which a plurality of laser beams raster-scanned by the scanning unit are provided at positions separated from the deflection unit by a predetermined distance in the traveling direction of the laser beam, and the viewer views the image. It is preferable that a plurality of laser beams be deflected so as to arrive in a state of being diffused with a substantially uniform width along the main scanning direction.

  According to the video display device configured as described above, it is necessary to control the irradiation of the laser beam on the control means side so as to reach the viewing zone in a state of being diffused with a substantially uniform width along the main scanning direction. This eliminates the complexity of control in the control means.

  Further, in the video display device according to any one of claims 2 to 7, as described in claim 9, the deflection unit is configured by a lens array having curvatures in the main scanning direction and the sub-scanning direction, The lens array has a plurality of laser beams raster-scanned by the scanning unit so that each of the laser beams reaches the viewing zone in a state of being diffused with a substantially uniform width along the main scanning direction and the sub-scanning direction. The laser beam may be configured to be deflected.

  According to the video display device configured in this way, the image data is controlled on the control means side so that the laser light reaches the viewing zone in a state of being diffused with a substantially uniform width along the main scanning direction and the sub-scanning direction. Therefore, it is not necessary to control the irradiation of the laser beam by changing the pitch of the laser beam, and it is possible to suppress complication of control in the control means.

Further, in the video display device according to any one of claims 1 to 9, as described in claim 10, the deflection unit may be configured by a hologram element.
According to the image display device configured as described above, the hologram element has a lens function only on the wavelength of the laser beam irradiated by the laser irradiation unit, and does not affect other light. be able to. Furthermore, the deflection means can be made thinner and lighter than when a normal lens is used.

  Further, in the video display device according to any one of claims 1 to 10, the viewing area is substantially reduced by the plurality of laser beams raster-scanned by the scanning unit. It is preferable that a plurality of laser beams be deflected so as to be filled.

  According to the video display device configured as described above, there is no region that is not irradiated with laser light in the viewing zone. For this reason, when the observer observes the video, the video is not interrupted even if the position of the eyes moves within the viewing zone.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
1 is a schematic diagram showing the configuration of the video display device 1, FIG. 2 is a schematic diagram showing the configuration of the laser element 2, FIG. 3 is a block diagram showing the configuration of the control device 5, and FIG. 4 shows the configuration of the movable mirror 3. FIG. 5 is a schematic diagram illustrating the deflection of laser light by the optical element 4.

First, the configuration of a video display device 1 to which the present invention is applied will be described with reference to FIG.
As shown in FIG. 1, the video display apparatus 1 includes a laser element 2 that irradiates a laser beam group LA composed of a plurality of (in this embodiment, five) laser beams, and a movable mirror that raster scans the laser beam groups LA. 3, an optical element 4 that deflects the laser beam group LB scanned by the movable mirror 3, and a control device 5 that controls the laser element 2 and the movable mirror 3.

  Among these, as shown in FIG. 2, the laser element 2 includes five laser light sources 11 to 15 that respectively irradiate laser beams LA1 to LA5 that constitute the laser beam group LA. When the laser light sources 11 to 15 are scanned by the movable mirror 3, the laser beams LA1 to LA5 are aligned in a line along the direction LHH1 along the main scanning direction SH1 (see FIG. 4) toward the optical element 4. It is arranged.

  Each of the laser light sources 11 to 15 includes electrodes 11a to 15a and lead wires 11b to 15b connected to the electrodes 11a to 15a. The laser light sources 11 to 15 irradiate the laser beams LA1 to LA5 by supplying laser drive signals from the control device 5 to the electrodes 11a to 15a via the lead wires 11b to 15b, respectively. A common electrode facing the electrodes 11a to 15a is not shown.

  In addition, as shown in FIG. 3, the control device 5 outputs an image memory 21 that stores display image data for image display by the video display device 1 and a laser drive signal for driving the laser light sources 11 to 15. It comprises a laser driver 22, a CPU 23 for controlling the image memory 21 and the laser driver 22, and a clock 24 for outputting a clock signal for synchronizing the image memory 21, the laser driver 22 and the CPU 23. The CPU 23 reads display image data from the image memory 21 in synchronization with a clock signal generated by the clock 24, and drives the laser light sources 11 to 15 at a predetermined timing based on the display image data. Two laser drive signals are output to the laser driver 22.

  The movable mirror 3 also includes a mirror portion 31 that reflects the laser beam group LA, and a laser beam that is reflected by the mirror portion 31 while rotatably supporting the mirror portion 31 about an axis 32a orthogonal to the main scanning direction SH1. A main scanning rotation unit 32 that rotates the mirror unit 31 so that the light group LA (hereinafter also referred to as a laser beam group LB) is scanned along the main scanning direction SH1, and a shaft 33a that is orthogonal to the sub-scanning direction SH2 is rotated. The main scanning rotation unit 32 is rotatably supported as an axis, and the sub scanning rotation unit 33 rotates the mirror unit 31 so that the laser beam group LB is scanned along the sub scanning direction SH2. As a driving force for rotating each mirror, an electrostatic actuator, an electromagnetic actuator, a piezo actuator, or the like can be used (not shown). The laser beams LA1 to LA5 reflected by the mirror unit 31 are also referred to as laser beams LB1 to LB5, respectively.

  Further, as shown in FIG. 1, the optical element 4 includes a plurality of lenses 41 having a curvature only in the main scanning direction SH1, and a direction perpendicular to the main scanning direction SH1 and the main scanning direction SH1 (in this embodiment, the sub-scanning direction). (Corresponding to SH2) and a lens array arranged in a plane. One lens 41 forms one pixel on the display screen of the video display device 1.

  As shown in FIG. 5, the curvature of the plurality of lenses 41 is such that laser light LB1 to LB5 deflected by the lens 41 (hereinafter also referred to as laser light LC1 to LC5) is viewed by the observer HM. It is set to fill the area SI.

  That is, first, the laser beams LA1 to LA5 are radiated side by side in the order of LA1, LA2, LA3, LA4, LA5 from the left in FIG. 5 with a predetermined divergence angle. Thereafter, the laser beams LA1 to LA5 are reflected by the movable mirror 3 and deflected by the optical element 4. Thereby, the laser beams LC1 to LC5 corresponding to the laser beams LA1 to LA5 spread in the main scanning direction SH1 in the order of LC1, LC2, LC3, LC4, and LC5 from the upper side in FIG. It reaches the viewing zone SI with widths LW1 to LW5.

  At this time, the curvature of the lens 41 having a curvature only in the main scanning direction SH1 is set so that the laser beams LC1 to LC5 having the spread widths LW1 to LW5 along the main scanning direction SH1 are in contact with each other. ing. Further, the curvature of the lens 41 is set so that the widths LW1 to LW5 are equal to each other.

Next, control of the laser element 2 and the movable mirror 3 by the control device 5 will be described with reference to FIGS.
FIG. 6 is a diagram for explaining a change in the positional relationship between the laser beam group LB (laser beams LB1 to LB5) scanned in the main scanning direction SH1 and the lens 41. FIG. 7A is a diagram showing a temporal change in the position of the laser beam group LB scanned by the movable mirror 3 in the main scanning direction SH1, and FIG. 7B is a laser beam group LB scanned by the movable mirror 3. It is a figure which shows the time change of the position of subscanning direction SH2. FIG. 8 is a diagram for explaining laser light control for displaying a multi-viewpoint stereoscopic image.

First, as shown in FIG. 6, the laser beam group LB (laser beams LB1 to LB5) is scanned from left to right in the drawing along the main scanning direction SH1.
In the optical element 4, lenses 41 are arranged side by side along the main scanning direction SH1, and an adjacent lens 41 has a region 42 where the lens 41 is not disposed (hereinafter referred to as a lens non-arranged region 42). Is provided. The width LSW along the main scanning direction SH1 of the lens 41 is configured to be slightly larger than the width LZW along the main scanning direction SH1 from the laser beam LB1 to the laser beam LB5, and the lens is not disposed. The width LHW of the region 42 along the main scanning direction SH1 is configured to be slightly smaller than the width LBW between adjacent laser beams LB1 to LB5.

  Therefore, first, when the laser beam LB5 is located at the left end of the lens 41 in the drawing (see time t1), only the laser beam LB4 is located in the lens non-arrangement region 42. Thereafter, when time elapses, only the laser beam LB3 is not arranged at time t2, only the laser beam LB2 is only at time t3, only the laser beam LB1 is only at time t4, and only the laser beam LB5 is not arranged at time t6. Located in region 42. Note that at time t5 between time t4 and time t6, all of the laser beams LB1 to LB5 are disposed in the region where the lens 41 is disposed. That is, the time required for the laser beam group LB (laser beams LB1 to LB5) to pass through one lens 41 is (t6-t1). During this time, the laser beams LB1 to LB5 sequentially pass through the lens non-arrangement region 42. pass.

  The optical element 4 cannot deflect the laser beams LB1 to LB5 that pass through the lens non-arrangement region 42. For this reason, the control device 5 stops the irradiation of the corresponding laser light source at the timing when each of the laser beams LB1 to LB5 is located in the non-arrangement region 42. For example, at time t1, since the laser beam LB4 is located in the lens non-arrangement region 42, the laser beam irradiation from the laser light source 14 is stopped and the laser beams are irradiated from the other laser light sources 11, 12, 13, and 15. .

  As shown in FIG. 7A, the locus of the laser beam group LB scanned by the movable mirror 3 in the main scanning direction SH1 shows a sine change. For this reason, the time required to pass through each lens 41 of the optical element 4 differs depending on the position where the lens 41 is arranged and is not constant. For example, the time (tb−ta) required to reach from the lens 41 arranged at the position Xa to the lens 41 arranged at the adjacent position Xb is from the lens 41 arranged at the position Xb to the adjacent one. Longer than the time (tc−tb) required to reach the lens 41 arranged at the position Xc.

  Further, as shown in FIG. 7B, the locus of the laser beam group LB scanned by the movable mirror 3 in the sub-scanning direction SH2 also shows a sinusoidal change. For this reason, the time required to move from one line along the sub-scanning direction SH2 to the adjacent line varies depending on the position of the line and is not constant. For example, the distance between the line V1 and the line V2 and the distance between the line V2 and the line V3 are the same, but the time (tq−tp) required to move from the line V1 to the line V2 is the line It is longer than the time (tr−tq) required to move from V2 to line V3.

  For this reason, the control device 5 determines the timing of irradiating the laser light from the laser light source in both the main scanning direction SH1 and the sub-scanning direction SH2, according to the position of the lens 41 and the line position to be irradiated with the laser light. The laser beam is controlled so as to pass through the desired lens 41 by changing.

Further, the control device 5 controls the irradiation of the laser light from the laser light source 14 so that a multi-viewpoint stereoscopic image can be displayed.
Specifically, as shown in FIG. 8, when the observer HM is at the observation position OP1, the light LR1 and the light LL1 out of the light emitted from the object OB1 are incident on the right and left eyes of the observer HM, respectively. Of the light emitted from OB2, light LR2 and light LL2 enter the right eye and left eye of the viewer HM, respectively. Accordingly, the control device 5 controls the irradiation of the laser light so as to reproduce these lights LR1, LL1, LR2, and LL2. Thereby, the observer HM located at the observation position OP1 is the crossing angle of both eyes caused by the difference in the images when the light beams LR1, LL1, LR2, and LL2 are imaged on the retinas of both eyes and the direction of the light rays. A difference in distance between the object OB1 and the object OB2 is perceived due to the convergence.

  When the observer HM moves to the observation position OP2, the light LR3 and the light LL3 out of the light emitted from the object OB1 respectively enter the right eye and the left eye of the observer HM, and the light LR4 out of the light emitted from the object OB2. And light LL4 enter the right eye and left eye of the viewer HM, respectively. Therefore, the control device 5 controls the laser light irradiation so as to reproduce these lights LR3, LL3, LR4, and LL4. As a result, the observer HM located at the observation position OP2 has a difference in the distance between the object OB1 and the object OB2 due to image difference or convergence when the images are formed on the retina of both eyes, similarly to the case where the observer HM is located at the observation position OP1. Perceive.

  And the control apparatus 5 reproduces | regenerates the image | video of a mutually different viewpoint about each of the laser light sources 11-15 which comprise the laser element 2. FIG. Of the laser light sources 11 to 15 constituting the laser element 2, for example, the laser light source 11 reproduces an image visually recognized by the observer HM located at the observation position OP1 and is visually recognized by the observer HM located at the observation position OP2. Is controlled so as to be reproduced by the laser light source 12.

  Thereby, the video display device 1 can display a natural video in which motion parallax according to the movement of the observer's viewpoint is reproduced. For example, even when the observation position of the observer HM changes from the observation position OP1 to the observation position OP2, the object OB1 and the object OB2 can be visually recognized as being at the same position.

  According to the image display device 1 of the first embodiment configured as described above, images viewed from a plurality of viewpoints can be reproduced by the laser beams emitted from the plurality of laser light sources 11 to 15. That is, the number of viewpoints for displaying an image per laser light source can be reduced. For this reason, the modulation frequency at the time of irradiating a laser beam can be made lower than when reproducing images viewed from a plurality of viewpoints with a laser beam irradiated from one laser light source. Thereby, if it is the same modulation frequency, a high-definition image | video can be displayed rather than the case where a laser beam is irradiated from one laser light source.

  Further, the curvature of the lens 41 having a curvature only in the main scanning direction SH1 is set so that the widths LW1 to LW5 are equal to each other. For this reason, it is not necessary to control the irradiation of the laser light by changing the pitch of the display image data on the control device 5 side so that the widths LW1 to LW5 are equal to each other, and control complexity in the control device 5 is suppressed. Can do.

  Further, laser beams LC1 to LC5 having spread widths LW1 to LW5 along the main scanning direction SH1 are in contact with adjacent laser beams. As a result, there is no region on the viewing zone SI that is not irradiated with laser light. For this reason, when an observer observes an image, the image is not interrupted even if the position of the eye moves within the viewing area SI.

  In the embodiment described above, the laser element 2 is the laser irradiation means in the present invention, the laser light sources 11 to 15 are the light emitting points in the present invention, the movable mirror 3 is the scanning means in the present invention, the optical element 4 is the deflection means in the present invention, The control device 5 is the control means in the present invention, and the direction LHH1 is the first arrangement direction in the present invention.

(Second Embodiment)
A second embodiment of the present invention will be described below with reference to the drawings. In the second embodiment, only parts different from the first embodiment will be described.

The video display device 1 in the second embodiment is the same as that in the first embodiment except that a laser element 102 is provided instead of the laser element 2.
9A is an exploded perspective view showing the configuration of the laser element 102, FIG. 9B is a cross-sectional view showing the configuration of the light emitting point 131, and FIG. 10 is a diagram for explaining the divergence angle of the laser beam.

  As shown in FIG. 9A, the laser element 102 includes a laser irradiation unit 111 that irradiates laser light, and a divergence angle adjustment unit 112 that adjusts the divergence angle of the laser light irradiated from the laser irradiation unit 111. Has been.

  The laser irradiation unit 111 includes five laser light sources 121 to 125 that individually irradiate laser beams. The laser light sources 121 to 125 are aligned in a line along the direction LHH1 aligned with the main scanning direction SH1 toward the optical element 4 when the laser beams emitted from the laser light sources 121 to 125 are scanned by the movable mirror 3. It is arranged.

  Each of the laser light sources 121 to 125 is provided with four light emitting points 131 that are different in size and can be irradiated independently along a direction LHH2 perpendicular to the direction LHH1. The magnitude of the laser beam output varies depending on the size of the light emitting point 131. Thereby, display of 16 gradations is possible according to the combination of light emission by the four light emission points 131.

  Further, as shown in FIG. 9B, a light emitting point 131 is formed on a surface emitting laser 151 that generates a laser beam of 808 nm, a sheet lens 152, an Nd: YVO4 crystal 153, and an SHG (Second Harmonic Generation) crystal. 154 (KTP crystal). In the light emitting point 131 configured as described above, first, the surface emitting laser 151 irradiates a laser beam of 808 nm. Thereafter, the sheet lens 152 condenses the laser light from the surface emitting laser 151, and the Nd: YVO4 crystal 153 converts the wavelength of the collected laser light to 1064 nm. Then, the SHG crystal 154 converts the 1064 nm laser beam into a 532 nm laser beam LD which is a second harmonic and irradiates the laser beam to the outside.

  Next, as shown in FIG. 9A, the divergence angle adjusting unit 112 has collimating lenses 141 disposed at positions facing the respective light emitting points 131. As shown in FIG. 10, the collimating lens 141 is formed of the laser beam LD emitted from the laser irradiation unit 111 so that the image visually recognized by the observer KM covers the viewing area in the vertical direction TH1 of the observer KM. Adjust the divergence angle. The horizontal divergence angle is adjusted in the same manner as in the first embodiment.

  According to the video display device 1 of the second embodiment configured as described above, it is not necessary to change the amount of light by controlling the number of times of laser light irradiation, so that the modulation frequency at the time of laser light irradiation is lowered. be able to. As a result, if the modulation frequency is the same, it is possible to display a higher-definition image than when the amount of light is changed by controlling the number of times of laser light irradiation.

  Specifically, in the case where gradation display is performed by repeating emission / non-emission of laser light emitted from one laser light source, the modulation frequency fl of the laser is the number of gradations G, the number of pixels n, and the screen rewriting frequency. It is expressed by the equation (1) using fd.

fl = G × n × fd (1)
On the other hand, in the video display device 1, since the gradation is controlled by light emission / non-light emission of different laser light sources, the modulation frequency fl of the laser is expressed by equation (2).

fl = n × fd (2)
That is, when the laser modulation frequency fl and the screen rewriting frequency fd are the same, the video display device 1 is compared with the one that repeats light emission / non-light emission of laser light emitted from one laser light source, The number of pixels n can be increased, and a high-definition image can be displayed.

In the embodiment described above, the laser element 102 is the laser irradiation means in the present invention, and the direction LHH2 is the second arrangement direction in the present invention.
(Third embodiment)
A third embodiment of the present invention will be described below with reference to the drawings. In the third embodiment, only parts different from the first embodiment will be described.

  The video display device 1 according to the third embodiment is the same as the first embodiment except that a laser element 202 is provided instead of the laser element 2 and an optical element 204 is provided instead of the optical element 4.

FIG. 11 is an exploded perspective view showing the configuration of the laser element 202, and FIG. 12 is a diagram for explaining vertical parallax.
As shown in FIG. 11, the laser element 202 includes a laser irradiation unit 211 that irradiates laser light, and a divergence angle adjustment unit 212 that adjusts the divergence angle of the laser light emitted from the laser irradiation unit 211. .

  The laser irradiation unit 211 includes five laser light sources 221 to 225 that irradiate laser beams independently. When the laser light emitted from the laser light sources 221 to 225 is scanned by the movable mirror 3, the laser light sources 221 to 225 are lined up along the direction LHH1 aligned with the main scanning direction SH1 toward the optical element 204. Is arranged.

  Further, each of the laser light sources 221 to 225 is arranged with three light emitting points 231a, 231b, and 231c having the same size and capable of being irradiated independently along a direction LHH2 perpendicular to the direction LHH1. The configuration of the light emitting points 231a, 231b, and 231c is the same as that of the light emitting point 131 of the second embodiment.

Further, as shown in FIG. 11A, the divergence angle adjusting unit 212 has collimating lenses 241 disposed at positions facing the respective light emitting points 231.
Next, as shown in FIG. 12, the optical element 204 includes a plurality of hemispherical lenses 251 in the main scanning direction SH1 and a direction orthogonal to the main scanning direction SH1 (corresponding to the sub-scanning direction SH2 in this embodiment). It is composed of a lens array arranged in a plane alongside. One lens 251 constitutes one pixel on the display screen of the video display device 1.

  Further, the control device 5 controls the irradiation of the laser light from the laser light source 202 so that a multi-view stereoscopic image can be displayed in the vertical direction. Specifically, for the light emitting points 231a, 231b, and 231c, images having different vertical viewpoints are reproduced. For example, as shown in FIG. 12, for three observation positions OP3, OP4, and OP5 having different viewpoints along the vertical direction TH1, the laser beam LE is given to the observer KM at the observation position OP3 and the observer KM at the observation position OP4. When the laser beam LF reaches the observer KM at the observation position OP5, the light emission point 231a emits the laser light LE, the light emission point 231b emits the laser light LF, and the light emission point 231b emits the laser light LF. The point 231c is irradiated with the laser beam LG.

  Further, the curvature in the vertical direction TH1 of the lens 251 is set so that the laser light LE, LF, LG deflected by the lens 251 fills the viewing area SI along the vertical direction TH1.

  That is, the laser beams LE, LF, LG are spread widths LW11, 12 along the vertical direction TH1 (sub-scanning direction SH2) in the order of the laser beams LE, LF, LG from the upper side in FIG. , 13 reach the viewing zone SI.

  At this time, the curvature of the lens 251 in the vertical direction TH1 is set so that the laser beams LE, LF, and LG having spread widths LW11, 12, and 13 along the vertical direction TH1 are in contact with each other. . Further, the curvature of the lens 251 in the vertical direction TH1 is set so that the widths LW11, 12, and 13 are equal to each other.

The curvature of the lens 251 in the main scanning direction SH1 is the same as that of the lens 41 of the first embodiment.
In addition, as shown in FIG. 11, the divergence angle adjustment unit 212 has a collimating lens 241 disposed at a position facing each light emitting point 231.

  According to the video display device 1 of the third embodiment configured as described above, the light emitting points 231a, 231b, and 231c are arranged in the direction LHH1 and in the direction LHH2 perpendicular to the direction LHH1. .

  Therefore, the laser beams emitted from the laser light sources 221 to 225 are aligned in the main scanning direction SH1 and aligned in the sub-scanning direction SH2 when scanned by the movable mirror 3, that is, in a rectangular shape. It is arranged in a state.

  Thereby, when the rectangular area formed by the irradiated laser light and the cross-sectional area of the lens 251 constituting one pixel are substantially equal, the laser light can be irradiated without protruding from the lens 251. Therefore, in the case of irradiating the laser over substantially the entire surface of the lens 251 constituting one pixel, there is no laser light source that irradiates the laser light wastefully, and the laser light can be irradiated efficiently. Video can be displayed.

  The curvature of the lens 251 is set so that the laser beam reaches the viewing zone SI in a state where the laser beam is diffused with a substantially uniform width along the main scanning direction SH1 and the sub-scanning direction SH2. In order to obtain a substantially uniform width, it is not necessary to control the laser beam irradiation on the control device 5 side, and the control device 5 can be prevented from being complicated.

  In the embodiment described above, the laser element 202 is the laser irradiation means in the present invention, the optical element 204 is the deflection means in the present invention, and the direction LHH2 is the second arrangement direction in the present invention.

(Fourth embodiment)
Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. In the fourth embodiment, only parts different from the first embodiment will be described.

The video display device 1 in the fourth embodiment is the same as that in the first embodiment except that a laser element 302 is provided instead of the laser element 2.
FIG. 13A is an exploded perspective view showing the configuration of the laser element 302, and FIG. 13B is a cross-sectional view showing the configuration of the laser light sources 321 to 325.

  As shown in FIG. 13A, the laser element 302 includes a laser irradiation unit 311 that irradiates laser light, and a divergence angle adjustment unit 312 that adjusts the divergence angle of the laser light emitted from the laser irradiation unit 311. Has been.

  The laser irradiation unit 311 includes five laser light sources 321 to 325 that irradiate laser beams independently. The laser light sources 321 to 325 are aligned in a line along the direction LHH1 aligned with the main scanning direction SH1 toward the optical element 4 when the laser beams emitted from the laser light sources 321 to 325 are scanned by the movable mirror 3. It is arranged.

  The laser light sources 321 to 325 are each provided with three light emitting points 331a, 331b, and 331c that can independently irradiate laser beams having different wavelengths along the direction LHH2 perpendicular to the direction LHH1.

  As shown in FIG. 13B, the laser light sources 321 to 325 are different in wavelength from three surface emitting lasers 350 arranged in a line along the direction LHH2 and laser light emitted from the surface emitting laser 350. It is comprised from the conversion part 351 converted into one laser beam, and the SHG crystal | crystallization (not shown) which converts the laser beam converted by the conversion part 351 into a 2nd harmonic.

The surface emitting laser 350 has a structure in which a reflective layer 350a, an active layer 350b, and a reflective layer 350c are stacked from above. The excitation light output from the active layer 350b is resonated by the reflective layer 350a and the reflective layer 350c, and the laser light having the wavelength λ ₀ (808 nm in this embodiment) is oscillated toward the reflective layer 350a. Has been.

The conversion unit 351 includes a solid laser medium layer 352 made of Nd: YVO4 crystal and Al ₂ O ₃ whose film thickness is adjusted so as to be highly reflective at the peak wavelength λ ₁ (in this embodiment, 1342 nm). / TiO ₂ multilayer reflective film 353, Al ₂ O ₃ / TiO ₂ multilayer reflective film 354 whose film thickness is adjusted to be highly reflective at peak wavelength λ ₂ (1064 nm in this embodiment), and peak wavelength λ ₃ (In this embodiment, 914 nm) and an Al ₂ O ₃ / TiO ₂ multilayer reflective film 355 whose film thickness is adjusted so as to be highly reflective. Hereinafter, the Al ₂ O ₃ / TiO ₂ multilayer reflective films 353 to 355 are simply referred to as reflective films 353 to 355.

The region to be the light emitting point 331a in the conversion unit 351 has a structure in which the reflective film 353, the solid laser medium layer 352, the reflective film 355, the reflective film 354, and the reflective film 353 are stacked in this order from the top. That is, the reflective films that are highly reflective at the peak wavelength λ ₁ (1342 nm) are disposed on the uppermost surface and the lowermost surface. As a result, laser light can be oscillated by selectively resonating laser light having a peak wavelength λ ₁ .

In addition, the region to be the light emission point 331b in the conversion unit 351 has a structure in which the reflective film 354, the reflective film 353, the solid laser medium layer 352, the reflective film 355, and the reflective film 354 are stacked in this order from the top. That is, the reflective films that are highly reflective at the peak wavelength λ ₂ (1064 nm) are arranged on the uppermost surface and the lowermost surface. As a result, laser light can be oscillated by selectively resonating laser light having a peak wavelength λ ₂ .

In addition, the region to be the light emitting point 331c in the conversion unit 351 has a structure in which the reflective film 355, the reflective film 354, the reflective film 353, the solid laser medium layer 352, and the reflective film 355 are stacked in this order from the top. That is, the reflective films that are highly reflective at the peak wavelength λ ₃ (914 nm) are disposed on the uppermost surface and the lowermost surface. As a result, laser light can be oscillated by selectively resonating laser light having a peak wavelength λ ₃ .

Then, the laser beams of wavelength λ ₁ (1342 nm), wavelength λ ₂ (1064 nm), and wavelength λ ₃ (914 nm) emitted from the converter 351 are converted into laser beams of wavelengths 671 nm, 532 nm, and 457 nm by the SHG crystal, respectively. Irradiated to the outside.

  According to the video display device 1 of the fourth embodiment configured as described above, three laser beams (671 nm, 532 nm, and 457 nm) having different wavelengths are irradiated independently along the direction LHH2, respectively. A color image can be displayed by controlling the combination of laser light irradiation.

In the embodiment described above, the laser element 302 is the laser irradiation means in the present invention, and the direction LHH2 is the second arrangement direction in the present invention.
(Fifth embodiment)
A fifth embodiment of the present invention will be described below with reference to the drawings.

The video display device 1 according to the fifth embodiment is the same as the first embodiment except that a hologram element 413 is provided instead of the optical element 4 and a light shielding unit 414 is added.
FIG. 14 is a schematic diagram showing the configuration of the video display device 1 of the fifth embodiment.

The hologram element 413 is attached to the inner surface of the windshield WS of the vehicle and deflects the laser light group LH scanned by the movable mirror 3. The hologram element 413 is configured to optically affect only light having a specific wavelength (in this embodiment, the laser beam group LH). This optical action is the same as that of the first embodiment. The element 4 is similar to the optical action of the laser beam on the laser beam. The light-shielding portion 414 is attached to the outer surface of the windshield WS so as to face the hologram element 413 so as to shield only the wavelength of the laser beam group LH. It is configured.

  According to the video display device 1 of the fifth embodiment configured as described above, the hologram element 413 exerts an optical action only on the light having the same wavelength as the laser light group LH, so that it passes through the windshield WS of the vehicle. It has almost no optical effect on the light from the driving scenery seen by the driver. Furthermore, the means for deflecting can be made thinner and lighter than when a normal lens is used.

  Further, since only the light having the same wavelength as that of the laser light group LH is shielded by the light shielding unit 414, an image can be displayed without any optical action on the light from the driving scenery.

As mentioned above, although one Example of this invention was described, this invention is not limited to the said Example, As long as it belongs to the technical scope of this invention, a various form can be taken.
For example, in the fourth embodiment, three light emitting points 331a, 331b, and 331c that can independently irradiate laser beams having different wavelengths are disposed along the direction LHH2 perpendicular to the direction LHH1. Although shown, the light emitting points for adjusting the light quantity of the video may be arranged along the LHH2 for each of the light emitting points 331a, 331b, 331c. With this configuration, it is not necessary to change the amount of light by controlling the number of times of laser light irradiation, so that the modulation frequency at the time of laser light irradiation can be lowered. Thus, if the modulation frequency is the same, a higher-definition color image can be displayed than when the amount of light is changed by controlling the number of times of laser light irradiation.

1 is a schematic diagram showing a configuration of a video display device 1. FIG. 3 is a schematic diagram showing a configuration of a laser element 2. FIG. 3 is a block diagram showing a configuration of a control device 5. FIG. 3 is a schematic diagram showing a configuration of a movable mirror 3. FIG. It is a figure explaining the deflection | deviation of the laser beam by the optical element. It is a figure explaining the change of the positional relationship between the laser beam group LB and the lens 41. FIG. It is a figure which shows the time change of the position of the main scanning direction SH1 and subscanning direction SH2 of the laser beam group LB. It is a figure explaining the laser beam control for displaying a multi-view stereoscopic image. It is a figure which shows the structure of the laser element and the light emission point. It is a figure explaining the divergence angle of a laser beam. 2 is an exploded perspective view showing a configuration of a laser element 202. FIG. It is a figure explaining vertical parallax. It is a figure which shows the structure of the laser element 302 and the laser light sources 321-325. It is a schematic diagram which shows the structure of the video display apparatus 1 of 5th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Video display apparatus, 2 ... Laser element, 3 ... Movable mirror, 4 ... Optical element, 5 ... Control apparatus, 11-15 ... Laser light source, 21 ... Image memory, 22 ... Laser driver, 23 ... CPU, 24 ... Clock , 31 ... Mirror part, 32 ... Main scanning rotation part, 33 ... Sub-scanning rotation part, 41 ... Lens, 102 ... Laser element, 111 ... Laser irradiation part, 112 ... Divergence angle adjustment part, 121 to 125 ... Laser light source, 131 DESCRIPTION OF SYMBOLS ... Light emitting point, 141 ... Collimating lens, 202 ... Laser element, 204 ... Optical element, 211 ... Laser irradiation part, 212 ... Divergence angle adjustment part, 221-225 ... Laser light source, 231a-231c ... Light emitting point, 241 ... Collimating lens 251: Lens 302: Laser element 311 Laser irradiation unit 312 Divergence angle adjustment unit 321-325 Laser light source 331a-331c Emission point, 341 ... collimator lens, 413 ... hologram element, 414 ... light shield portion

Claims (11)

Laser irradiating means having a plurality of light emitting points each independently irradiating laser light;
Scanning means for raster scanning laser light emitted from the plurality of light emitting points in a main scanning direction and a sub-scanning direction;
Deflection means for deflecting the laser beam raster-scanned by the scanning means;
Control means for controlling irradiation of the laser light from the plurality of light emitting points by the laser irradiation means so that the laser light deflected by the deflection means reproduces images viewed from a plurality of viewpoints. A video display device. The light emitting points are
The laser light emitted from the plurality of light emitting points is arranged along a first arrangement direction in which the laser light is emitted side by side in the main scanning direction toward the deflecting unit. Video display device. The light emitting points are
The laser beams emitted from the plurality of light emitting points are arranged along a first arrangement direction irradiated side by side in the main scanning direction toward the deflecting unit, and in a direction different from the main scanning direction. It arrange | positions along the 2nd arrangement direction irradiated side by side. The video display apparatus of Claim 1 characterized by the above-mentioned. The control means includes
Of the plurality of light emitting points, the video for each of the plurality of viewpoints is displayed by the light emitting points arranged along the first arrangement direction, and the light emission points arranged along the second arrangement direction The image display apparatus according to claim 3, wherein irradiation of laser light from the plurality of light emitting points is controlled so as to adjust a light amount of an image for each of a plurality of viewpoints. 4. The video display device according to claim 3, wherein light emitting points that irradiate laser beams having different wavelengths are arranged along the second arrangement direction. 5. 6. The image according to claim 5, wherein a light emitting point for adjusting a light amount of the image is arranged along the second arrangement direction for each light emitting point irradiated with the laser light having a different wavelength. Display device. The video display apparatus according to claim 3, wherein the direction different from the main scanning direction is a direction substantially orthogonal to the main scanning direction. The deflection means is composed of a lens array having a curvature in the main scanning direction,
The lens array is
Each of the plurality of laser beams raster-scanned by the scanning unit is provided at a position away from the deflecting unit by a predetermined distance in the traveling direction of the laser beam, so that an observer can view an image. The plurality of laser beams are deflected so as to reach a certain viewing area in a state of being diffused with a substantially uniform width along the main scanning direction. The video display device according to claim 7. The deflection means is composed of a lens array having a curvature in the main scanning direction and the sub-scanning direction,
The lens array is
Each of the plurality of laser beams raster-scanned by the scanning unit is provided at a position away from the deflecting unit by a predetermined distance in the traveling direction of the laser beam, so that an observer can view an image. The plurality of laser beams are configured to be deflected so as to reach a viewing zone in a state of being diffused with a substantially uniform width along the main scanning direction and the sub-scanning direction. The video display device according to any one of claims 3 to 7.   The video display device according to claim 1, wherein the deflecting unit includes a hologram element. The deflection means includes
An area in which an observer views an image by being provided at a predetermined distance from the deflecting unit in a traveling direction of the laser beam by the plurality of laser beams raster-scanned by the scanning unit. The video display device according to any one of claims 1 to 10, wherein the plurality of laser beams are deflected so that a viewing zone is substantially filled.