JP7346052B2 - image display device - Google Patents

Description

The present disclosure relates to an image display device.

The optical system of a typical image display device has a configuration using a plurality of reflection parts. For example, the head-up display device of Patent Document 1 is configured to guide light emitted from a projection section to a projection point on a windshield via a first reflection section, a second reflection section, a folding mirror, and a concave mirror. .

JP2016-14861A

The applicant discovered the following problems. The head-up display device of Patent Document 1 has a problem that the head-up display device becomes large because the light emitted from the projection section follows an optical path that is turned back in a zigzag manner.
The present disclosure has been made in view of such problems, and achieves miniaturization of an image display device.

An image display device according to one aspect of the present disclosure includes:
a first light source;
a spherical lens into which the light emitted from the first light source enters;
an aspherical lens into which the light emitted from the spherical lens enters;
a first free-form surface mirror into which the light emitted from the aspherical lens is incident;
a second free-form surface mirror into which the light emitted from the first free-form surface mirror is incident;
a third free-form surface mirror into which the light emitted from the second free-form surface mirror is incident;
an image display panel on which the light emitted from the third free-form mirror enters and displays image information;
Equipped with
The optical path of the light emitted from the first free-form mirror, the optical path of the light emitted from the second free-form mirror, and the optical path of the light emitted from the third free-form mirror are mutually intersect.

According to the present disclosure, it is possible to downsize an image display device.

1 is a diagram for explaining the configuration of an image display device according to Embodiment 1. FIG. 1 is a diagram schematically showing the arrangement of each element of the image display device of Embodiment 1. FIG. 3 is a different diagram schematically showing the arrangement of each element of the image display device according to the first embodiment; FIG. FIG. 3 is a perspective view showing a first reduction portion of the first embodiment. FIG. 3 is a front view showing the first reduction section of the first embodiment. FIG. 6 is a different perspective view showing the first reducing portion of the first embodiment. FIG. 3 is a perspective view showing a rotated state of the diffuser of the first reduction part of the first embodiment. 3 is a table showing the shapes of spherical lenses and aspheric lenses of the image display device of Embodiment 1. FIG. This is a table for explaining coefficients. 2 is a table showing shapes of a first free-form mirror, a second free-form mirror, and a third free-form mirror of the image display device according to the first embodiment. This is a table for explaining coefficients. 2 is a table showing the arrangement of a diffusion section, an aspherical lens, a spherical lens, a first free-form mirror, a second free-form mirror, and a third free-form mirror of the image display device according to the first embodiment. Compared to the case of FIG. 12, when the user's eyes move to the side of the image display device, the diffusion section, the aspherical lens, the spherical lens, the first free-form mirror of the image display device of Embodiment 1, It is a table showing the arrangement of a second free-form surface mirror and a third free-form surface mirror. Compared to the case of FIG. 12, when the user's eyes move to the opposite side to the side of the image display device, the diffusion section, the aspherical lens, the spherical lens, and the first 3 is a table showing the arrangement of a free-form mirror, a second free-form mirror, and a third free-form mirror. FIG. 7 is a perspective view showing a first reduction portion of Embodiment 2. FIG. FIG. 7 is a diagram schematically showing the arrangement of each element of an image display device according to a fourth embodiment. FIG. 7 is a different diagram schematically showing the arrangement of each element of the image display device according to the fourth embodiment.

Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings are simplified as appropriate.

<Embodiment 1>
First, the basic configuration of the image display device of this embodiment will be explained. FIG. 1 is a diagram for explaining the configuration of an image display device according to this embodiment. FIG. 2 is a diagram schematically showing the arrangement of each element of the image display device of this embodiment. FIG. 3 is a different diagram schematically showing the arrangement of each element of the image display device of this embodiment. Note that in the following description, a three-dimensional (XYZ) coordinate system will be used for clarity of explanation.

As shown in FIG. 1, the image display device 1 of this embodiment is configured to focus on the user's eye position and emit light so that a good image is formed at the eye position. ing. As shown in FIGS. 2 and 3, the image display device 1 includes a first light source 2, a first reflective mirror 3, a first scanning section 4, a beam splitter 5, a second reflective mirror 6, and a parabolic mirror 7. , a diffusing section 8, a spherical lens 9, an aspherical lens 10, a first free-form mirror 11, a second free-form mirror 12, a third free-form mirror 13, a second light source 14, and a third reflective mirror 15. , a second scanning section 16, and an image display panel 17, and these elements are mounted on a housing.

The first light source 2 is a white light source. The first light source 2 is, for example, a laser light source, and emits RGB laser light toward the − side of the X-axis. The first reflecting mirror 3 receives the light emitted from the first light source 2 and emits the light to the first scanning unit 4 . The first reflection mirror 3 is arranged, for example, on the negative side of the X-axis with respect to the first light source 2, and emits the light emitted from the first light source 2 to the negative side of the Z-axis.

The first scanning unit 4 scans the light incident from the first reflection mirror 3 and outputs the scanned light to the beam splitter 5 . The first scanning unit 4 includes, for example, a MEMS (Micro Electro Mechanical Systems) Mirror. The first scanning unit 4 is disposed on the Z-axis negative side with respect to the first reflecting mirror 3, and directs the light incident from the first reflecting mirror 3 on the Y-axis negative side and on the Z-axis side. Emit light diagonally on the + side of the axis.

The first scanning unit 4 can be rotatably driven around two axes, the X-axis and the Y-axis, and scans the user's left and right eyes according to the position of one of the user's left and right eyes (XYZ position) detected by the sensor. The position of incidence of light incident on the diffusing section 8 via the parabolic mirror 7 or the like is controlled so that a good image is formed at the position of one eye. Here, since the technique of controlling light according to the position of the user's eyes is already known, detailed explanation will be omitted. Note that the first scanning unit 4 may have any configuration as long as it can scan light.

The beam splitter 5 transmits the light incident from the first scanning section 4 and outputs the light to the second reflection mirror 6 . For example, the beam splitter 5 is disposed on the negative side of the Y axis and the positive side of the Z axis with respect to the first scanning unit 4, and can spread the light incident from the first scanning unit 4 without bending it. Emits light.

The second reflection mirror 6 emits the light incident from the beam splitter 5 to the parabolic mirror 7. The second reflection mirror 6 is arranged, for example, on the negative side of the Y axis and the positive side of the Z axis with respect to the beam splitter 5, and outputs the light incident from the beam splitter 5 to the positive side of the Y axis. do. At this time, the beam splitter 5 is arranged between the first scanning section 4 and the second reflection mirror 6.

The parabolic mirror 7 causes the light incident from the second reflection mirror 6 to be incident perpendicularly onto the light incident surface of the diffusing section 8 . The parabolic mirror 7 is arranged, for example, on the Y-axis + side with respect to the second reflection mirror 6, and outputs the light incident from the second reflection mirror 6 to the Z-axis − side.

The diffusing unit 8 diffuses the light incident from the parabolic mirror 7 so as to irradiate the entire display area of the image display panel 17 and outputs the diffused light to the spherical lens 9 . The diffusing unit 8 includes, for example, a diffractive optical element and a diffusing plate, and is configured to shape the light incident from the parabolic mirror 7 into a substantially rectangular shape so that the entire display area of the image display panel 17 can be irradiated with the light. It functions as a beam shaper that spreads to

The diffusing section 8 is arranged on the Z-axis negative side with respect to the parabolic mirror 7, and emits the light incident from the parabolic mirror 7 to the Z-axis negative side. However, the diffusing section 8 only needs to be able to diffuse the light incident from the parabolic mirror 7 so that the entire display area of the image display panel 17 can be irradiated with the light.

The spherical lens 9 has a concave surface on its light output surface, and outputs the light incident from the diffusion section 8 to the aspherical lens 10 . The spherical lens 9 is arranged, for example, on the negative side of the Z-axis with respect to the diffusing section 8, and outputs the light incident from the diffusing section 8 toward the negative side of the Z-axis.

The aspherical lens 10 has a convex surface on its light entrance surface, and emits the light incident from the spherical lens 9 to the first free-form mirror 11 . The aspherical lens 10 is arranged, for example, on the negative side of the Z-axis with respect to the spherical lens 9, and outputs the light incident from the spherical lens 9 to the negative side of the Z-axis. Note that the detailed arrangement and shape of the spherical lens 9 and the aspherical lens 10 will be described later.

The first free-form mirror 11 emits the light incident from the aspherical lens 10 to the second free-form mirror 12 . The first free-form surface mirror 11 is arranged, for example, on the Z-axis negative side with respect to the aspherical lens 10, and the reflective surface of the first free-form surface mirror 11 is generally on the Y-axis negative side, and It faces toward the Z-axis + side.

That is, the diffusing section 8, the spherical lens 9, and the aspherical lens 10 are arranged between the parabolic mirror 7 and the first free-form mirror 11. The first free-form mirror 11 emits, for example, the light incident from the aspherical lens 10 in an oblique direction on the negative side of the Y axis and the positive side of the Z axis.

The second free-form mirror 12 emits the light incident from the first free-form mirror 11 to the third free-form mirror 13. The second free-form mirror 12 is arranged, for example, on the negative side of the Y-axis with respect to the first free-form mirror 11, and the reflective surface of the second free-form mirror 12 is generally placed on the positive side of the Y-axis. It's suitable. The second free-form mirror 12 emits, for example, the light incident from the first free-form mirror 11 in an oblique direction on the Y-axis + side and on the Z-axis + side.

The third free-form surface mirror 13 emits the light incident from the second free-form surface mirror 12 to the image display panel 17. The third free-form mirror 13 is arranged, for example, on the Y-axis + side with respect to the second free-form mirror 13, and the reflective surface of the third free-form mirror 13 is generally on the Y-axis negative side. and is facing toward the negative side of the Z-axis. The third free-form mirror 13 emits, for example, the light incident from the second free-form mirror 12 to the − side of the Z-axis.

These first free-form surface mirror 11, second free-form surface mirror 12, and third free-form surface mirror 13 are designed to be focused at the position of the user's eyes. As shown in FIG. 2, the optical path of the light emitted from the first free-form surface mirror 11, the optical path of the light emitted from the second free-form surface mirror 12, and the optical path of the light emitted from the third free-form surface mirror 13. The first free-form surface mirror 11, the second free-form surface mirror 12, and the third free-form surface mirror 13 are arranged so that the optical paths of the generated light overlap with each other, that is, so that the mutual optical paths are folded. There is. The detailed arrangement and shape of the first free-form mirror 11, the second free-form mirror 12, and the third free-form mirror 13 will be described later.

The second light source 14 is a white light source. The second light source 14 is, for example, a laser light source, and emits RGB laser light to the Y-axis negative side. The third reflecting mirror 15 receives the light emitted from the second light source 14 and emits the light to the second scanning section 16 . The third reflecting mirror 15 is arranged, for example, on the negative side of the Y-axis with respect to the second light source 14, and directs the light emitted from the second light source 14 on the positive side of the Y-axis and the Z-axis. Emit light diagonally to the - side.

The second scanning unit 16 scans the light incident from the third reflection mirror 15 and outputs it to the beam splitter 5 . The second scanning unit 16 includes, for example, a MEMS Mirror. The second scanning unit 16 is disposed on the Y-axis + side and the Z-axis − side with respect to the third reflection mirror 15, and converts the light incident from the third reflection mirror 15 into Emits light on the + axis side.

The second scanning unit 16 can be rotatably driven around two axes, the X-axis and the Y-axis, and changes the position of the user's other eye according to the position of the user's other eye detected by the sensor. The position of incidence of the light incident on the diffusing section 8 via the parabolic mirror 7 or the like is controlled so that a good image is formed. Here, since the technique of controlling light according to the position of the user's eyes is already known, detailed explanation will be omitted. Note that the second scanning unit 16 may have any configuration as long as it can scan light.

At this time, the beam splitter 5 bends the light incident from the second scanning section 16 and places the light incident from the first scanning section 4 and the light incident from the second scanning section 16 on the same optical path. The light is then emitted to the parabolic mirror 7.

The image display panel 17 displays image information. The image display panel 17 is, for example, an LCD (Liquid Crystal Display) panel that displays hologram image information or 3D image information. When displaying hologram image information, the image display panel 17 simultaneously displays right-eye image information and left-eye image information. When displaying 3D (dimensions) image information, the image display panel 17 displays image information for the right eye and image information for the left eye, alternating them at a preset period. However, the image display panel 17 may display 2D image information.

Such an image display device 1 can form a good image on one eye of the user via the image display panel 17 with the light emitted from the first light source 2, and the light emitted from the second light source 14 can form a good image on one eye of the user. The light allows a good image to be formed on the user's other eye via the image display panel 17. Therefore, if hologram image information or 3D image information is displayed as image information on the image display panel 17, the user can recognize a three-dimensional image.

At this time, in the image display device 1, the optical path of the light emitted from the first free-form mirror 11, the optical path of the light emitted from the second free-form mirror 12, and the third The first free-form mirror 11, the second free-form mirror 12, and the third free-form mirror 13 are arranged so that the optical path of the light emitted from the free-form mirror 13 overlaps. Therefore, compared to the head-up display device of Patent Document 1, the image display device 1 can be made smaller.

Incidentally, the first light source 2, the first reflective mirror 3, the first scanning unit 4, the beam splitter 5, the second reflective mirror 6, the second light source 14, the third reflective mirror 15, and the second scanning The portion 16 is preferably arranged in a space on the Z-axis + side of the third free-form mirror 13. Further, the spherical lens 9 and the aspherical lens 10 are preferably arranged in a space on the Y-axis + side of the third free-form mirror 13. Thereby, the dead space within the housing of the image display device 1 can be effectively utilized, contributing to miniaturization of the image display device 1.

Here, when using a laser light source as the first light source 2 and the second light source 14, since the laser light is coherent light, there is a possibility that speckles will occur in the image formed via the image display panel 17. There is.

Therefore, it is preferable to provide a first reduction section between the parabolic mirror 7 and the diffusion section 8. Here, FIG. 4 is a perspective view showing the first reducing portion of this embodiment. FIG. 5 is a front view showing the first reducing section of this embodiment. FIG. 6 is a different perspective view showing the first reducing portion of this embodiment. FIG. 7 is a perspective view showing a rotated state of the diffuser of the first reduction section of this embodiment.

As shown in FIGS. 4 to 6, the first reduction section 20 includes a diffuser 21, a first frame section 22, a second frame section 23, a ball support 24, an elastic body 25, and a drive section 26. . The diffuser 21 is composed of a diffusion plate, and has, for example, a rectangular shape.

The first frame portion 22 includes an opening 22a, a first through hole 22b, and a second through hole 22c. The opening 22a has, for example, a rectangular shape, and the diffuser 21 is fixed inside the opening 22a.

The first through hole 22b and the second through hole 22c have a substantially circular shape when viewed from the Z-axis direction. These first through-holes 22b and second through-holes 22c are arranged at substantially the same height in the Y-axis direction, and spaced apart from each other in the X-axis direction.

For example, as shown in FIG. 5, when the first frame portion 22 has a basic shape of a substantially rectangular shape when viewed from the Z-axis direction, the first through hole 22b is located on the X-axis + side of the first frame portion 22. and the second through hole 22c is arranged at a corner of the first frame 22 on the X-axis side and on the Y-axis side. There is.

The second frame part 23 is arranged on the Z-axis + side with respect to the first frame part 22. The second frame portion 23 includes an opening 23a, a first through hole 23b, and a second through hole 23c. The opening 23a has a rectangular shape, for example, so as to correspond to the opening 22a of the first frame 22, and roughly overlaps with the opening 22a of the first frame 22 in the Z-axis direction.

The first through hole 23b and the second through hole 23c have a substantially circular shape when viewed from the Z-axis direction. These first through-holes 23b and second through-holes 23c are arranged at substantially the same height in the Y-axis direction and spaced apart from each other in the X-axis direction.

For example, as shown in FIG. 5, when the second frame portion 23 has a basic shape of a substantially rectangular shape when viewed from the Z-axis direction, the first through hole 23b is located on the X-axis + side of the second frame portion 23. and the second through hole 23c is arranged at a corner of the second frame 23 on the X-axis side and on the Y-axis side. There is.

The ball support 24 has a structure in which a ball is rotatably held by a holding part, and the ball projects from the tip of the holding part in a biased state. The ball support 24 is fixed to the second frame part 23 with the ball in contact with the surface of the first frame part 22 on the Z-axis + side. Thereby, the first frame portion 22 is configured to be movable relative to the second frame portion 23 on the XY plane.

Such a ball support 24 is arranged around the opening 23a of the second frame 23. For example, the ball bearings 24 are arranged on both sides of the opening 23a of the second frame portion 23 in the X-axis direction, and on the negative side of the Y-axis of the opening 23a. However, as long as the first frame part 22 can be moved relative to the second frame part 23 on the XY plane, the ball support may not be used; for example, a sliding support may be used. Furthermore, the arrangement of the ball bearings 24 is not limited either.

The elastic body 25 connects the first frame portion 22 and the second frame portion 23 so as to press the Z-axis + side surface of the first frame portion 22 against the ball of the ball support 24 . The elastic body 25 is, for example, a coil spring, and is arranged so as to straddle the gap between the first frame part 22 and the second frame part 23.

The drive section 26 rotates the first frame section 22. The drive unit 26 includes a first rotating shaft 26a, a second rotating shaft 26b, a belt 26c, and a motor 26d. The first rotating shaft 26a has a basic shape of a cylinder. The first rotation shaft 26a extends in the Z-axis direction and is rotatably passed through the first through hole 23b of the second frame portion 23.

A pin 26f is provided on the Z-axis − side surface of the first rotating shaft 26a so as to protrude from the Z-axis − side surface in the Z-axis direction. The pin 26f is arranged at an eccentric position with respect to the central axis of the first rotating shaft 26a. The tip of the pin 26f is rotatably passed through the first through hole 22b of the first frame 22.

Since the second rotating shaft 26b has the same configuration as the first rotating shaft 26a, the second rotating shaft 26b is rotatably passed through the second through hole 23c of the second frame 23, although a redundant explanation will be omitted. ing. The tip of the pin 26g protruding from the Z-axis − side surface of the second rotating shaft 26b is rotatably passed through the second through hole 22c of the first frame 22.

At this time, the positional relationship in the XY plane between the pin 26f of the first rotating shaft 26a and the central axis of the first rotating shaft 26a, and the positional relationship between the pin 26g of the second rotating shaft 26b and the second rotating shaft 26b. The positional relationship in the XY plane with the central axis of is approximately equal.

The belt 26c is an endless belt, and is stretched around the first rotating shaft 26a and the second rotating shaft 26b. Thereby, the central axis of the first rotating shaft 26a, the pin 26f of the first rotating shaft 26a, the central axis of the second rotating shaft 26b, the pin 26g of the second rotating shaft 26b, and the belt 26c. , form a parallel linkage.

The motor 26d is connected to the Z-axis + side end of the second rotating shaft 26b so that the rotational driving force of the motor 26d can be transmitted to the second rotating shaft 26b. However, the motor 26d may be connected to the Z-axis + side end of the first rotating shaft 26a.

In such a first reduction unit 20, when the motor 26d is rotationally driven, the second rotating shaft 26b rotates, and the first rotating shaft 26a is synchronized with the second rotating shaft 26b via the belt 26c. Rotate as shown.

At this time, as described above, the central axis of the first rotating shaft 26a, the pin 26f of the first rotating shaft 26a, the central axis of the second rotating shaft 26b, and the pin 26g of the second rotating shaft 26b. , belt 26c form a parallel link mechanism, so when the first rotating shaft 26a and the second rotating shaft 26b rotate, the diffuser 21 can be rotated with respect to the second frame 23. . As a result, as shown in FIG. 7, the position of the diffuser 21 with respect to the second frame portion 23 can be changed.

By rotating the diffuser 21 in this manner, coherent light can be converted into incoherent light, and the occurrence of speckles can be suppressed. Moreover, since the diffuser 21 is rotated, it is possible to suppress the concentration of light energy on one point of the diffuser 21, and damage to the diffuser 21 can be suppressed.

Note that if speckles cannot be suppressed even by using the first reducing unit 20, a second reducing unit 30 or a second light source 14 is installed between the first light source 2 and the first scanning unit 4. A third reduction unit 40 may be disposed between the second scanning unit 16 and the second scanning unit 16 .

The second reduction unit 30 is arranged between the first reflection mirror 3 and the first scanning unit 4, as shown in FIG. The second reduction unit 30 includes a first collimator lens 31 , a diffuser 32 , a drive unit 33 , and a second collimator lens 34 .

The first collimator lens 31 receives the light emitted from the first reflection mirror 3 , spreads the light into parallel light, and outputs the parallel light to the diffuser 32 . The diffuser 32 is composed of, for example, a circular diffuser plate, and diffuses the light incident from the first collimator lens 31 and outputs it to the second collimator lens 34 .

The drive unit 33 rotates the diffuser 32 around the center of the diffuser 32 . The drive unit 33 includes a motor and the like, and the output shaft of the motor is connected to the center of the diffuser 32 so that the rotational driving force of the drive unit 33 can be transmitted to the diffuser 32.

The second collimator lens 34 condenses the light incident from the diffuser 32 and outputs it to the first scanning unit 4 . In such a second reduction unit 30, when the diffuser 32 is rotated, coherent light can be converted into incoherent light, and the occurrence of speckles can be suppressed. Moreover, since the diffuser 32 is rotated, it is possible to suppress the concentration of light energy on one point of the diffuser 32, and damage to the diffuser 32 can be suppressed.

The third reduction unit 40 is arranged between the third reflection mirror 15 and the second scanning unit 16, as shown in FIG. Since such a third reduction section 40 has substantially the same configuration as the second reduction section 30, a redundant explanation will be omitted, but like the second reduction section 30, the first collimator It includes a lens 41, a diffuser 42, a driving section 43, and a second collimator lens 44.

In the third reduction unit 40 as well, when the diffuser 42 is rotated, coherent light can be converted into incoherent light, and the generation of speckles can be suppressed. Moreover, since the diffuser 42 is rotated, it is possible to suppress the concentration of light energy on one point of the diffuser 42, and damage to the diffuser 42 can be suppressed.

Next, the shapes of the spherical lens 9 and the aspherical lens 10 will be explained. FIG. 8 is a table showing the shapes of the spherical lens and the aspherical lens of the image display device of this embodiment. FIG. 9 is a table for explaining the coefficients. Incidentally, the R1 surface of the aspherical lens in FIG. 8 is a light entrance surface, and the R2 surface of the aspherical lens in FIG. 8 is a light exit surface. Further, the R1 surface of the spherical lens in FIG. 8 is a light exit surface, and the R2 surface of the spherical lens in FIG. 8 is a light entrance surface.

For example, the spherical lens 9 and the aspherical lens 10 can have the shapes shown in FIG. 8 . Here, the shape of the aspherical lens 10 can be defined by the following equation (1). Incidentally, z is the amount of sag in a plane parallel to the Z axis.

Next, the shapes of the first free-form surface mirror 11, the second free-form surface mirror 12, and the third free-form surface mirror 13 will be explained. FIG. 10 is a table showing the shapes of the first free-form mirror, the second free-form mirror, and the third free-form mirror of the image display device of this embodiment. FIG. 11 is a table for explaining coefficients.

For example, the first free-form mirror 11, the second free-form mirror 12, and the third free-form mirror 13 can have the shapes shown in FIG. 10. Here, the first free-form surface mirror 11, the second free-form surface mirror 12, and the third free-form surface mirror 13 can be defined by the following equations (2) to (4). Incidentally, x is the X coordinate of the reflective surface, y is the Y coordinate of the reflective surface, z is the sag amount of the surface parallel to the Z axis, k is the Conic constant, and C _j is the coefficient of the monomial x ^m y ⁿ . Here, the X coordinate and Y coordinate are the X coordinate and Y coordinate shown in FIGS. 12 to 14.

Next, the arrangement of the diffuser 8, the spherical lens 9, the aspherical lens 10, the first free-form mirror 11, the second free-form mirror 12, and the third free-form mirror 13 will be explained. FIG. 12 is a table showing the arrangement of the diffusion section, the aspherical lens, the spherical lens, the first free-form mirror, the second free-form mirror, and the third free-form mirror of the image display device of this embodiment. . FIG. 13 shows the diffusion section, the aspherical lens, the spherical lens, the first 3 is a table showing the arrangement of a free-form surface mirror, a second free-form surface mirror, and a third free-form surface mirror. FIG. 14 shows the diffusion section, aspherical lens, and spherical surface of the image display device of this embodiment when the user's eyes move to the opposite side to the image display device side compared to the case of FIG. It is a table showing the arrangement of a lens, a first free-form surface mirror, a second free-form surface mirror, and a third free-form surface mirror.

Here, the origin of the XYZ coordinates is the user's eye position, α is the inclination (eccentricity) around the X axis, and the + side is the counterclockwise direction when viewed from the - side of the X axis in Figure 2. . Further, β is the slope around the Y-axis, and the + side is the counterclockwise direction when viewed from the + side of the Y-axis in FIG. γ is the slope around the Z axis.

The diffuser 8, the spherical lens 9, the aspherical lens 10, the first free-form mirror 11, the second free-form mirror 12, and the third free-form mirror 13 adopt the arrangement shown in FIGS. 12 to 14, for example. can do. At this time, the diffuser 8, the spherical lens 9, and the aspherical lens 10 move in the Z-axis direction according to the position of the user's eyes, as shown in FIGS. 12 to 14.

In such an image display device 1, as described above, three free-form mirrors 11, 12, and 13 are used in the optical system, and the optical path of the light emitted from the first free-form mirror 11 and the second The first free-form mirror 11 and the second free-form mirror 12 are arranged so that the optical path of the light emitted from the free-form mirror 12 and the optical path of the light emitted from the third free-form mirror 13 overlap. and a third free-form mirror 13. Therefore, compared to the head-up display device of Patent Document 1, the image display device 1 can be made smaller.

Moreover, since the light emitted from the first light source 2 and the light emitted from the second light source 14 are arranged on the same optical path and emitted by the beam splitter 5, the time delay is caused by one image display panel 17. Images can be formed in the left and right eyes at the same time.

Moreover, when using a laser light source as the first light source 2 and the second light source 14, if the first reduction section 20, the second reduction section 30, and the third reduction section 40 are provided, the image display panel 17 Speckles occurring in the image formed on the user's eyes can be reduced through this method.

<Embodiment 2>
Although the first reducing unit 20 of the first embodiment has a configuration in which the diffuser 21 is rotated, this is not a limitation. FIG. 15 is a perspective view showing the first reducing portion of this embodiment. The first reduction unit 50 of this embodiment is configured to swing the diffuser 51 in the X-axis direction, as shown in FIG. 15. Here, the first reduction section 50 is arranged so as to cover the light incident surface of the diffusion section 8 surrounded by the frame section 18 .

The first reduction section 50 includes a diffuser 51, a frame section 52, and a drive section 53. The diffuser 51 is, for example, a rectangular diffusion plate. The frame portion 52 includes an opening 52a. The opening 52a has, for example, a rectangular shape, and the diffuser 51 is fixed inside the opening 52a.

The drive section 53 swings the frame section 52 in the X-axis direction. The drive section 53 includes, for example, a linear actuator 53a, and a slider 53b of the linear actuator 53a is fixed to the frame section 52. As a result, when the linear actuator 53a is driven, the diffuser 51 can be swung in the X-axis direction via the frame portion 52. However, although the drive section 53 of this embodiment includes the linear actuator 53a, it may have any configuration as long as it can swing the frame section 52 in the X-axis direction.

By swinging the diffuser 51 in this manner, coherent light can be converted into incoherent light, and the occurrence of speckles can be suppressed. Moreover, since the diffuser 51 is oscillated, it is possible to suppress the concentration of light energy on one point of the diffuser 51, and damage to the diffuser 51 can be suppressed.

<Embodiment 3>
Note that a remote phosphor or a QD (Quantum Dot) sheet may be used as the diffusion section 8 to reduce speckles that occur in the image formed on the user's eyes via the image display panel 17. The remote phosphor is, for example, made of a transparent film coated with a phosphor that converts the wavelength of blue laser light into green and red as excitation light, or a film in which the phosphor is kneaded. . A QD sheet is constructed by forming quantum dots on a transparent film.

These remote phosphors and QD sheets emit white light when a blue laser is incident thereon. Therefore, when using a remote phosphor or a QD sheet as the diffusion section 8, it is preferable to use a blue laser light source as the first light source 2 and the second light source 14. At this time, most of the blue light is converted into green and red light, and the remaining blue light passes through the remote phosphor or QD sheet and becomes white light.

Such a remote phosphor or QD sheet can also convert coherent light into incoherent light, and can suppress the occurrence of speckles. Here, it is preferable that the remote phosphor and the QD sheet have a structure that allows them to be rotated or swung in the same manner as the diffusers of the second and third embodiments.

As a result, as described above, the remaining blue light is transmitted through the remote phosphor or the QD sheet, thereby reducing speckles that occur in the image formed on the user's eyes. Moreover, it is possible to suppress the concentration of light energy on one point of the remote phosphor or the QD sheet, and it is possible to suppress damage to the remote phosphor or the QD sheet.

<Embodiment 4>
The image display device of this embodiment has a configuration that can switch between displaying hologram image information or 3D image information on the image display panel 17 and displaying 2D image information on the image display panel 17. ing.

FIG. 16 is a diagram schematically showing the arrangement of each element of the image display device of this embodiment. FIG. 17 is a different diagram schematically showing the arrangement of each element of the image display device of this embodiment. As shown in FIGS. 16 and 17, the image display device 60 of this embodiment has substantially the same configuration as the image display device 1 of the first embodiment, but includes a polymer-dispersed liquid crystal panel 61 and a third A light source 62 is provided.

In the polymer-dispersed liquid crystal panel 61, when a voltage is applied to the polymer-dispersed liquid crystal panel 61, the liquid crystals are arranged so as to transmit light, and when the voltage application to the polymer-dispersed liquid crystal panel 61 is stopped, the liquid crystals are arranged so as to transmit light. Liquid crystals are arranged to scatter light. The polymer dispersed liquid crystal panel 61 is arranged to cover the light incident surface of the image display panel 17.

The third light source 62 is arranged so that the light reaches the polymer dispersed liquid crystal panel 61. For example, as the third light source 62, as shown in FIGS. 16 and 17, four LED (Light Emitting Diode) light sources 62a, 62b, 62c, and 62d are provided.

The LED light sources 62a and 62b are arranged on both sides of the aspherical lens 10 in the X-axis direction so that the light emitted from the LED light sources 62a and 62b enters the first free-form mirror 11. At this time, the light incident on the first free-form mirror 11 reaches the polymer-dispersed liquid crystal panel 61 via the second free-form mirror 12 and the third free-form mirror 13.

The LED light sources 62c and 62d are arranged so as not to block the light emitted from the third free-form mirror 13 so that the light emitted from the LED light sources 62c and 62d directly reaches the polymer dispersed liquid crystal panel 61. , are arranged on the Z-axis + side of the polymer dispersed liquid crystal panel 61.

In such an image display device 60, when displaying hologram image information or 3D image information on the image display panel 17, a voltage is applied to the polymer-dispersed liquid crystal panel 61 so that the polymer-dispersed liquid crystal panel 61 emits light. The first light source 2 and the second light source 14 emit light. Thereby, a three-dimensional image can be formed on the user's eyes via the image display panel 17.

On the other hand, in the image display device 60, when displaying 2D image information on the image display panel 17, the application of voltage to the polymer-dispersed liquid crystal panel 61 is stopped to turn the polymer-dispersed liquid crystal panel 61 into a white state; Light is emitted from the third light source 62. Thereby, the light incident on the polymer dispersed liquid crystal panel 61 is diffused and illuminates the entire display area of the image display panel 17. As a result, a planar image can be formed on the user's eyes via the image display panel 17.

However, the polymer-dispersed liquid crystal panel 61 of this embodiment becomes a state in which light is transmitted by applying a voltage to the polymer-dispersed liquid crystal panel 61; In the above example, stopping the application of voltage to the polymer-dispersed liquid crystal panel 61 causes the light to be transmitted. A configuration may also be used in which light is diffused by applying a voltage to.

Note that the third light source 62 may be arranged so that the light reaches the polymer-dispersed liquid crystal panel 61; It does not need to be an LED light source as long as it can illuminate the surface well.

Above, the invention made by the present inventor has been specifically explained based on the embodiments, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit. It goes without saying that there is.

For example, the light emitted from the first light source 2 may be made incident on the first scanning unit 4 without using the first reflecting mirror 3, or the second light source may be made incident on the first scanning unit 4 without using the third reflecting mirror 15. The light emitted from the scanning section 14 may be made incident on the second scanning section 16. In short, the incident path of light to the parabolic mirror 7 is not limited.

For example, the first light source 2 and the second light source 14 are not limited to laser light sources, and the display area of the image display panel 17 is well irradiated with the light emitted from the first light source 2 and the second light source 14. It's fine if you can. Furthermore, the second light source 14, third reflection mirror 15, second scanning section 16, and beam splitter 5 may be omitted.

1 Image display device 2 First light source 3 First reflective mirror 4 First scanning unit 5 Beam splitter 6 Second reflective mirror 7 Parabolic mirror 8 Diffusion unit 9 Spherical lens 10 Aspherical lens 11 First free-form mirror 12 Second free-form mirror 13 Third free-form mirror 14 Second light source 15 Third reflective mirror 16 Second scanning section 17 Image display panel 18 Frame section 20 First reducing section 21 Diffuser 22 First Frame, 22a Opening, 22b First through hole, 22c Second through hole 23 Second frame, 23a Opening, 23b First through hole, 23c Second through hole 24 Ball support 25 Elastic body 26 drive unit, 26a first rotation axis, 26b second rotation axis, 26c belt, 26d motor, 26f, 26g pin 30 second reduction unit, 31 first collimator lens, 32 diffuser, 33 drive unit, 34 second collimator lens 40 third reduction section, 41 first collimator lens, 42 diffuser, 43 drive section, 44 second collimator lens 50 first reduction section 51 diffuser 52 frame section, 52a opening Section 53 Drive section, 53a Linear actuator, 53b Slider 60 Image display device 61 Polymer dispersed liquid crystal panel 62 Third light source

Claims (8)

a first light source;
The light emitted from the first light source is incident, and the light emitted from the first light source is focused on the position of the user's eyes according to the detected position of the user's eyes. a first scanning unit that scans;
a spherical lens into which the light emitted from the first light source enters;
a diffusion section that emits diffused light to the spherical lens;
a parabolic mirror into which the light emitted from the first scanning section is incident and which emits the light perpendicularly to the light incident surface of the diffusion section;
an aspherical lens into which the light emitted from the spherical lens enters;
a first free-form surface mirror into which the light emitted from the aspherical lens is incident;
a second free-form surface mirror into which the light emitted from the first free-form surface mirror is incident;
a third free-form surface mirror into which the light emitted from the second free-form surface mirror is incident;
an image display panel on which the light emitted from the third free-form mirror enters and displays image information;
Equipped with
The optical path of the light emitted from the first free-form mirror, the optical path of the light emitted from the second free-form mirror, and the optical path of the light emitted from the third free-form mirror are mutually Image display device that intersects. The image display device according to claim 1 , further comprising a first reduction section between the diffusion section and the parabolic mirror for reducing speckles that occur in an image formed via the image display panel. . 2. The method according to claim 1 , further comprising a second reducing section for reducing speckles generated in an image formed via the image display panel between the first light source and the first scanning section. 2. The image display device according to 2 . The spherical lens, the aspherical lens , and the diffusing section move in the optical path direction of light according to the position of the user's eyes so that the focus is on the user's eye position. 3. The image display device according to any one of 3 . a second light source;
The light emitted from the second light source is incident, and the light emitted from the second light source is scanned so as to be focused on the user's eye position according to the user's eye position. a second scanning unit that
a beam splitter disposed between the first scanning section and the parabolic mirror and between the second scanning section and the parabolic mirror;
Equipped with
The light emitted from the first scanning section and the light emitted from the second scanning section are incident on the beam splitter,
The light emitted from the first scanning section and the light emitted from the second scanning section are arranged on the same optical path by the beam splitter and emitted to the parabolic mirror . The image display device according to any one of the items. 6. The apparatus according to claim 5 , further comprising a third reducing section between the second light source and the second scanning section for reducing speckles generated in an image formed via the image display panel. The image display device described. a polymer dispersed liquid crystal panel covering a light incident surface of the image display panel;
a third light source that emits the light so that the light reaches the polymer dispersed liquid crystal panel;
Equipped with
When displaying hologram image information or 3D image information on the image display panel, the polymer dispersed liquid crystal panel is set in a light-transmissive state and light is emitted from the first light source to display 2D image information on the image display panel. When displaying image information, the image display device according to any one of claims 1 to 4 , wherein the polymer dispersed liquid crystal panel is placed in a state where light is diffused and light is emitted from the third light source. . a polymer dispersed liquid crystal panel covering a light incident surface of the image display panel;
a third light source that emits the light so that the light reaches the polymer dispersed liquid crystal panel;
Equipped with
When displaying hologram image information or 3D image information on the image display panel, the polymer-dispersed liquid crystal panel is placed in a light-transmissive state and light is emitted from the first light source and the second light source; When displaying 2D image information on the image display panel, the image display according to claim 5 or 6 , wherein the polymer dispersed liquid crystal panel is placed in a state where light is diffused and light is emitted from the third light source. Device.

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