Head-mounted display and lens unit

Abstract

A head-mounted display (1) mounted on the head of a user (U) comprises: a first display panel (10); and a lens unit (30) including a first lens part (31) that guides, to a pupil of the user (U), first image light (L1) emitted from a display region of the first display panel (10), and a first enlargement lens part (E11) that is provided partially around the first lens part (31) and that enlarges the lens surface through which the first image light (L1) enters.

Description

Head-mounted displays, lens units

[0001] The present disclosure relates to a head-mounted display and a lens unit.

[0002] 2. Description of the Related Art Conventionally, as disclosed in Patent Document 1, a head-mounted display has been known that has a display panel that displays an image and an optical system that includes a lens.

[0003] International Publication No. 2016 / 136657

[0004] The inventors of the present application are studying how to widen the viewing angle in a head-mounted display to enhance the sense of immersion.

[0005] One object of the present disclosure is to provide a head-mounted display and a lens unit with a wide viewing angle.

[0006] The head-mounted display proposed in the present disclosure is a head-mounted display worn on a user's head, and has a lens unit including a first display panel, a first lens portion that guides first image light emitted from a display area of ​​the first display panel to the user's pupil, and a first extension lens portion that is partially provided around the first lens portion and extends the lens surface onto which the first image light is incident.

[0007] The lens unit proposed in the present disclosure comprises a first lens portion that guides first image light emitted from a display area of ​​a first display panel to a user's pupil, a first expansion lens portion that is partially provided around the first lens portion and expands the lens surface onto which the first image light is incident, a second lens portion that guides second image light emitted from a display area of ​​a second display panel to the pupil, and a second expansion lens portion that is partially provided around the second lens portion and expands the lens surface onto which the second image light is incident, wherein the first lens portion includes a first inclined surface, and the second lens portion includes a second inclined surface that forms a first recess together with the first inclined surface, and the first expansion lens portion and the second expansion lens portion are provided in the first recess.

[0008] FIG. 1 is a perspective view of an HMD according to this embodiment, as seen from the front left. FIG. 2 is a diagram schematically showing the configuration of a display panel and an optical system. FIG. 3 is a diagram showing an example of a display image that a user can view through a lens unit. FIG. 4 is a perspective view of a lens unit according to this embodiment. FIG. 5 is a rear view of a lens unit according to this embodiment, as seen from behind. FIG. 6 is a top view of a lens unit according to this embodiment, as seen from above. FIG. 7 is a front view of a lens unit according to this embodiment, as seen from the front. FIG. 8 is a schematic view showing how a first lens unit and a first extension lens unit guide image light to a user's pupil. FIG. 9 is a graph showing the optical characteristics of the first lens unit and the first extension lens unit. FIG. 10 is a diagram explaining a modified example of this embodiment.

[0009] An embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below with reference to the drawings. In the following description, a head-mounted display will be referred to as an "HMD (Head Mounted Display)." In the following description, the directions indicated by X1 and X2 in the drawings will be referred to as right and left, respectively, the directions indicated by Y1 and Y2 in the drawings will be referred to as up and down, respectively, and the directions indicated by Z1 and Z2 in the drawings will be referred to as forward and backward, respectively. These directions indicate the directions as seen by a user wearing the HMD 1.

[0010] [Overview of HMD 1] Fig. 1 is a perspective view of an HMD according to this embodiment, seen from the left front. In the following description, the state in which the HMD 1 is worn by a user is referred to as the "usage state." In the usage state, the HMD 1 covers the user's eyes.

[0011] The HMD 1 preferably includes a wearing band that surrounds the user's head and a main body housing that is supported on the front of the wearing band. The main body housing contains various components such as a display panel and an optical system.

[0012] 1 is an example and is not limited to this. The HMD 1 is only required to be worn on the user's head and to have a display panel that displays images, and the shapes of the attachment band and main body housing are not limited to those shown in the figure.

[0013] [Display Panel and Optical System] Next, the display panel and optical system will be described with reference to FIG. 2. FIG. 2 is a diagram schematically illustrating the configuration of the display panel and optical system. FIG. 2 schematically illustrates the first display panel 10, the second display panel 20, and the lens unit 30 when in use, as viewed from above. While FIG. 2 illustrates the display panel and optical system on the left eye side of the user U, the configuration illustrated in FIG. 2 may be provided on both the right eye side and the left eye side. Furthermore, while FIG. 2 illustrates the lens unit 30 included in the optical system, the optical system may include other optical components.

[0014] The HMD 1 includes a first display panel 10, a second display panel 20, and a lens unit 30. The lens unit 30 includes a first lens portion 31 and a second lens portion 32. The first lens portion 31 and the second lens portion 32 may be fixed to each other.

[0015] The first display panel 10 and the second display panel 20 are displays that display two-dimensional or three-dimensional images. The first display panel 10 preferably displays a first image in an area corresponding to at least the lens surface of the first lens portion 31. The second display panel 20 preferably displays a second image in an area corresponding to at least the lens surface of the second lens portion 32. Hereinafter, the areas of the first display panel 10 and the second display panel 20 where images are displayed will be referred to as display areas.

[0016] The first display panel 10 and the second display panel 20 may be, for example, a liquid crystal display or an organic electroluminescence display device, but the type is not particularly limited.

[0017] The first display panel 10 is disposed so that its display surface is positioned directly in front of the eyes of the user U. The second display panel 20 is disposed to the left of the first display panel 10 so that its display surface is inclined relative to the display surface of the first display panel 10. By arranging the two display panels side by side in this manner, the viewing angle in the left-right direction (horizontal direction) can be improved. Furthermore, the cost required for the display panels can be reduced compared to when a single display panel with high resolution is used. Note that the arrangement and orientation of the first display panel 10 and the second display panel 20 are not limited to those shown in the figure.

[0018] The first lens unit 31 is provided opposite the first display panel 10. Specifically, the first lens unit 31 is provided so that its optical axis is perpendicular to the display surface of the first display panel 10. The first lens unit 31 preferably functions as a convex lens that guides the first image light L1 emitted from the first display panel 10 to the pupil of the user U. The distance between the first lens unit 31 and the first display panel 10 may be set appropriately to obtain a desired focal length.

[0019] The second lens unit 32 is provided opposite the second display panel 20. Specifically, the second lens unit 32 is provided so that its optical axis is perpendicular to the display surface of the second display panel 20. The second lens unit 32 preferably functions as a convex lens that guides the second image light L2 emitted from the second display panel 20 to the pupil of the user U. The distance between the second lens unit 32 and the second display panel 20 may be set appropriately to obtain a desired focal length.

[0020] The first lens portion 31 and the second lens portion 32 may be aspherical lenses, spherical lenses, free-form lenses, or the like.

[0021] [Display Image] Next, the display image will be described with reference to Fig. 3. Fig. 3 is a diagram showing an example of a display image that can be viewed by a user through the lens unit. Fig. 3 shows a grid pattern displayed on each display panel.

[0022] As shown in Figure 3, a first image D1 viewed by the user U through the first lens unit 31 and a second image D2 viewed by the user U through the second lens unit 32 form a continuous single display image D.

[0023] Here, the first lens portion 31 and the second lens portion 32 are formed based on convex lenses. A convex lens has a shape that is thick at the center and becomes thinner toward the periphery. Furthermore, a convex lens has a shape that is symmetrical with respect to the optical axis in order to refract light so that the focal point is located on the optical axis, which is the center of the lens. Therefore, the planar shape of the convex lens when viewed from the optical axis direction is approximately circular. In a configuration in which two such lenses are arranged side by side, there is an area between the first image D1 and the second image D2 where no image is visible. Specifically, as shown in FIG. 3 , an ineffective area N1 where no image is visible exists above the boundary b between the first image D1 and the second image D2, and an ineffective area N2 where no image is visible exists below the boundary b between the first image D1 and the second image D2.

[0024] The presence of the non-effective areas N1 and N2 narrows the viewing angle. For example, when the user U tilts his / her field of view upward, the non-effective area N1 enters the user U's field of view, but no visible image exists in that area. Therefore, in this embodiment, in order to widen the viewing angle, a configuration is adopted in which extension lens members E1 and E2 are provided in the portions of the lens unit 30 that correspond to the non-effective areas N1 and N2, respectively.

[0025] [Extended Lens Element] The extended lens element E1 in this embodiment will be described with reference to Figures 3 to 9. Note that in this embodiment, the configurations and arrangements of the first display panel 10 and the second display panel 20 are the same as those described in Figures 2 and 3, so the same components are designated by the same reference numerals and detailed descriptions thereof will be omitted.

[0026] Fig. 4 is a perspective view showing the lens unit in this embodiment. Fig. 5 is a rear view of the lens unit in this embodiment, as seen from behind. Fig. 6 is a top view of the lens unit in this embodiment, as seen from above. Fig. 7 is a front view of the lens unit in this embodiment, as seen from the front. Fig. 8 is a schematic diagram showing how the first lens unit and the first extension lens unit guide image light to the user's pupil. Fig. 9 is a graph showing the optical characteristics of the first lens unit and the first extension lens unit.

[0027] The first lens portion 31 has a left side surface 31L that is a flat surface extending in the vertical direction, and the other portions have a substantially circular outer shape. The left side surface 31L of the first lens portion 31 is located at a boundary B with the second lens portion 32.

[0028] The second lens portion 32 has a shape symmetrical to the first lens portion 31 across the boundary B. That is, the right side surface 32R of the second lens portion 32 is a flat surface extending in the vertical direction, and the outer shape of the other portions of the second lens portion 32 is approximately circular. The right side surface 32R of the second lens portion 32 is located at the boundary B with the first lens portion 31.

[0029] The first lens portion 31 may be formed by, for example, cutting the left portion of a convex lens having a substantially circular outer shape in the vertical direction. Similarly, the second lens portion 32 may be formed by, for example, cutting the right portion of a convex lens having a substantially circular outer shape in the vertical direction. The first lens portion 31 and the second lens portion 32 may be fixed to each other by bonding the left side surface 31L of the first lens portion 31 and the right side surface 32R of the second lens portion 32 together.

[0030] The first lens portion 31 includes a first inclined surface S11 in the upper left portion. The second lens portion 32 includes a second inclined surface S12 in the upper right portion, which together with the first inclined surface S11 form a downwardly convex recess.

[0031] In this embodiment, the first extended lens member E1 is provided so as to fill the recess formed between the first inclined surface S11 and the second inclined surface S12.

[0032] The first extension lens member E1 includes a first extension lens portion E11 and a second extension lens portion E12. The first extension lens portion E11 is provided partially around the periphery of the first lens portion 31 and extends the lens surface onto which the first image light L1 is incident. The second extension lens portion E12 is provided partially around the periphery of the second lens portion 32 and extends the lens surface onto which the second image light L2 is incident.

[0033] The first extension lens unit E11 may be fixed by adhesive to the first inclined surface S11 of the first lens unit 31. The second extension lens unit E12 may be fixed by adhesive to the second inclined surface S12 of the second lens unit 32. The tops of the first extension lens unit E11 and the second extension lens unit E12 are both flat surfaces and may be flush with each other. This configuration prevents the lens unit 30 from becoming too large.

[0034] The first expansion lens member E1 allows the user U to view an image in the non-effective region N1 shown in Fig. 3. Specifically, as shown in Fig. 8, the first expansion lens unit E11 guides first image light L1 emitted from the display region of the first display panel 10 to the pupil of the user U so that the user U views the image in the non-effective region N11. Although the second display panel 20, the second lens unit 32, and the second expansion lens unit E12 are not shown in Fig. 8, the second expansion lens unit E12 guides second image light L1 emitted from the second display panel 20 to the pupil of the user U so that the user U views the image in the non-effective region N12.

[0035] In the first display panel 10 and the second display panel 20, images may be displayed in areas corresponding to the first extension lens unit E11 and the second extension lens unit E12 in addition to areas corresponding to the first lens unit 31 and the second lens unit 32. That is, the display areas of the first display panel 10 and the second display panel 20 may be expanded in accordance with the first extension lens unit E11 and the second extension lens unit E12.

[0036] As shown in FIG. 9 , the first extension lens unit E11 preferably has optical characteristics that are continuously connected to the optical characteristics of the first lens unit 31, which change radially outward from the optical axis of the first lens unit 31. However, these optical characteristics do not necessarily have to be strictly continuously connected, as long as they are adjusted to be continuously connected. Here, the optical characteristics may be distortion, magnification, resolution performance (MTF: Modulation Transfer Function), etc. Such optical characteristics of the first extension lens unit E11 allow the user U to visually recognize the boundary between the first lens unit 31 and the first extension lens unit E11 without any sense of incongruity. Furthermore, the second extension lens unit E12 preferably has optical characteristics similar to those of the second lens unit 32.

[0037] The first extension lens unit E11 may be, for example, a Fresnel lens. Specifically, as shown in FIG. 7 , the first extension lens unit E11 may have a plurality of arc-shaped grooves G1 centered on the optical axis of the first lens unit 31 and arranged radially on the surface onto which the first image light L1 is incident. Similarly, the second extension lens unit E12 may have a plurality of arc-shaped grooves G2 centered on the optical axis of the second lens unit 32 and arranged radially on the surface onto which the second image light L2 is incident. Note that the surfaces of the first extension lens unit E11 and the second extension lens unit E12 facing the user U may be flat.

[0038] The first extension lens unit E11 and the second extension lens unit E12 are not limited to Fresnel lenses, but may be any lenses that can be arranged to fill the recess formed between the first inclined surface S11 and the second inclined surface S12 and that allow the user U to view a natural image. For example, the first extension lens unit E11 and the second extension lens unit E12 may be liquid crystal lenses including a liquid crystal layer that can control the light reflection performance.

[0039] 4, 5, etc., in this embodiment, a second expansion lens member E2 is provided to fill the recess formed between the inclined surface S21 of the first lens unit 31 and the inclined surface S22 of the second lens unit 32. The second expansion lens member E2 may include a third expansion lens member E21 fixed to the inclined surface S21 of the first lens unit 31 by adhesive bonding, and a fourth expansion lens member E22 fixed to the inclined surface S22 of the second lens unit 32 by adhesive bonding. The second expansion lens member E2 allows the user U to view an image in the non-effective area N2 shown in FIG.

[0040] Note that when the user U views the display areas through the lens unit 30, each display area appears distorted. Therefore, distortion correction may be performed using electronic means. In other words, distortion correction may be performed by taking into account the amount of distortion caused by the lens so that an image opposite to the distortion is displayed on the display screen.

[0041] Summary of the Present Embodiment The HMD 1 according to the present embodiment employs a configuration in which an extended lens element is provided in the lens unit 30 including the first lens portion 31 and the second lens portion 32, thereby enabling an enlarged viewing angle. This enhances the sense of immersion of the user U using the HMD 1. Furthermore, the extended lens element has optical properties according to the lens element, allowing the user U to view images without feeling uncomfortable.

[0042] It is possible to increase the diameters of the first lens portion 31 and the second lens portion 32 to widen the viewing angle, but in that case, the thickness of the central portions of the first lens portion 31 and the second lens portion 32 would increase due to the properties of convex lenses. In this embodiment, by adopting a configuration in which an extended lens member is provided, it is possible to prevent the lens unit 30 from becoming larger. Furthermore, while a Fresnel lens reduces resolution due to visible grooves, by adopting convex lenses for the first lens portion 31 and the second lens portion 32, it is possible to prevent a reduction in resolution in the area that is most easily visible to the user U.

[0043] [Modification] Fig. 10 is a diagram illustrating a modification of this embodiment. Fig. 10 shows an example in which, in addition to the configuration described with reference to Figs. 4 to 9, a light-scattering film 50 is attached to the extended lens member. By providing the light-scattering film 50, the resolution of the image viewed in the ineffective area shown in Fig. 3 becomes coarser. This blurs the boundary between the image viewed through the lens unit and the image viewed through the extended lens unit, preventing the user U from feeling uncomfortable at the boundary.

[0044] When the extension lens unit is a Fresnel lens, it is preferable that a light-scattering film 50 is provided on the surface opposite to the surface on which the grooves are formed. Fig. 10 shows an example in which the light-scattering film 50 is provided on the surface of the extension lens unit E11 facing the user U. Although Fig. 10 does not show the second extension lens unit E12, it is preferable that a light-scattering film 50 is similarly attached to the second extension lens unit E12.

[0045] The light-scattering film 50 preferably has a stronger light scattering intensity on the outside than on the inside in the radial direction of the optical axis of the first lens unit 31. Similarly, the light-scattering film 50 preferably has a stronger light scattering intensity on the outside than on the inside in the radial direction of the optical axis of the second lens unit 32. Alternatively, a light-scattering film may be used in which the light scattering intensity increases continuously or intermittently from the inside to the outside in the radial direction of the optical axis of the first lens unit 31 or the second lens unit 32. In this way, by intentionally blurring areas that are difficult for the user U to see, it is possible to prevent the user U from feeling uncomfortable.

[0046] The light scattering film 50 is not limited to this, and a light scattering member other than a film may be provided. The light scattering member may be any member that has the function of reducing resolution by scattering light. Instead of providing a light scattering member, the surface of the extended lens member may be processed to cause light scattering. Instead of providing a light scattering member, the display panel may display an image viewed through the extended lens member with a lower resolution than an image viewed through the lens portion.

[0047] [Other Modifications] In the present embodiment, an example in which the number of display panels is two has been shown, but this is not limiting. For example, the number of display panels may be three or more. In this case, lens units may be provided according to the number of display panels. Furthermore, it is also preferable that an extension lens unit is provided between each lens unit. Note that the multiple display panels are not limited to being arranged side by side in the horizontal direction, but may also be arranged side by side in the vertical direction, etc.

[0048] The number of display panels may also be one. In this case, the number of lens units may also be one, and, for example, extension lens units may be provided at the upper left, lower left, upper right, and lower right of the single lens unit. This configuration can widen the viewing angle. The extension lens unit may be provided at least partially around the lens unit. The display panel may also include multiple display areas. For example, the display panel may be a flexible panel including a first display area and a second display area, and may be bent so that the second display area is inclined relative to the first display area. In this case, the lens unit and extension lens unit may be provided to correspond to the first display area and the second display area.

[0049] In addition, in the present embodiment, an example has been described in which the first lens unit 31, the second lens unit 32, the first extension lens member E1, and the second extension lens member E2 are separate members that are fixed to each other by adhesive, but this is not limiting. These members may be integrally molded using a single mold. Alternatively, the first lens unit 31 and the second lens unit 32 may be integrally molded, and the separate extension lens members may be fixed to the integrally molded members by adhesive or the like.

[0050] [Additional Notes] For example, the head-mounted display may have the following configurations. (1) A head-mounted display worn on a user's head, comprising: a first display panel; a lens unit including: a first lens unit that guides first image light emitted from a display area of ​​the first display panel to the user's pupil; and a first extension lens unit that is partially provided around the first lens unit and extends a lens surface onto which the first image light is incident. (2) The head-mounted display described in (1), wherein the first extension lens unit is provided in at least one of the upper left, lower left, upper right, and lower right of the first lens unit. (3) The head-mounted display described in (1) or (2), wherein the first extension lens unit includes a flat surface at either the upper or lower part. (4) The head-mounted display according to any one of (1) to (3), wherein the first extended lens unit has optical characteristics that are continuously connected to the optical characteristics of the first lens unit that change radially outward from the optical axis of the first lens unit. (5) The head-mounted display according to any one of (1) to (4), wherein the first extended lens unit is a Fresnel lens having arc-shaped grooves formed on a surface onto which the first image light is incident. (6) The head-mounted display according to any one of (1) to (5), wherein the first extended lens unit is a liquid crystal lens including a liquid crystal layer capable of controlling light reflection performance. (7) The head-mounted display according to any one of (1) to (5), wherein a light scattering member is provided on the first extended lens unit. (8) The head-mounted display according to (7), wherein the light scattering member has a stronger light scattering intensity on the outer side in the radial direction of the optical axis of the first lens unit than on the inner side. (9) The head-mounted display according to (1), further comprising a second display panel arranged alongside the first display panel, wherein the lens unit includes a second lens portion that guides second image light emitted from a display area of ​​the second display panel to the pupil, and a second extension lens portion that is partially provided around the second lens portion and extends the lens surface onto which the second image light is incident.(10) The head mounted display according to (9), wherein the second display panel is disposed so that its display surface is inclined relative to the display surface of the first display panel. (11) The head mounted display according to (9) or (10), wherein the first lens unit includes a first inclined surface, the second lens unit includes a second inclined surface that forms a first depression together with the first inclined surface, and the first extended lens unit and the second extended lens unit are provided in the first depression. (12) The head mounted display according to any of (9) to (11), wherein the first extended lens unit and the second extended lens unit include a flat surface at either their upper or lower portions. (13) The head mounted display according to any one of (9) to (12), wherein the first extended lens unit has optical characteristics that are continuously connected to the optical characteristics of the first lens unit that change radially outward from the optical axis of the first lens unit, and the second extended lens unit has optical characteristics that are continuously connected to the optical characteristics of the second lens unit that change radially outward from the optical axis of the second lens unit. (14) The head mounted display according to any one of (9) to (13), wherein the first extended lens unit is a Fresnel lens having an arc-shaped groove formed on a surface onto which the first image light is incident, and the second extended lens unit is a Fresnel lens having an arc-shaped groove formed on a surface onto which the second image light is incident. (15) The head mounted display according to any one of (9) to (14), wherein the first extended lens unit and the second extended lens unit are liquid crystal lenses including a liquid crystal layer capable of controlling light reflectivity.(16) A head-mounted display according to any one of (9) to (15), wherein the lens unit includes: a third extension lens portion that is partially provided around the first lens portion and that extends a lens surface onto which the first image light is incident; and a fourth extension lens portion that is partially provided around the second lens portion and that extends a lens surface onto which the second image light is incident; the first lens portion includes a third inclined surface; the second lens portion includes a fourth inclined surface that, together with the third inclined surface, forms a second recess that is recessed in a direction opposite to the first recess; and the third extension lens portion and the fourth extension lens portion are provided in the second recess. (17) The head-mounted display according to (1), wherein the first display panel is a flexible panel including a first display area and a second display area, and the lens unit includes: the first lens portion that guides the first image light emitted from the first display area to the pupil; a second lens portion that guides the second image light emitted from the second display area to the pupil; the first extension lens portion that expands a lens surface onto which the first image light is incident; and a second extension lens portion that is partially provided around the periphery of the second lens portion and expands a lens surface onto which the second image light is incident.

[0051] 1 head mounted display, 10 first display panel, 20 second display panel, 30 lens unit, 31 first lens portion, 32 second lens portion, E1 first extension lens member, E11 first extension lens portion, E12 second extension lens portion.

Claims

1. A head-mounted display worn on a user's head, comprising: a first display panel; a lens unit including: a first lens portion that guides first image light emitted from the display area of ​​the first display panel to the user's pupil; and a first extension lens portion that is partially provided around the periphery of the first lens portion and extends the lens surface onto which the first image light is incident.

2. The head-mounted display according to claim 1, wherein the first extended lens unit is provided at least in one of the upper left, lower left, upper right, and lower right of the first lens unit.

3. The head-mounted display according to claim 2, wherein the first extended lens portion includes a flat surface on either the top or bottom.

4. A head-mounted display according to claim 1, wherein the first extended lens section has optical characteristics that are continuously connected to the optical characteristics of the first lens section, which change radially outward from the optical axis of the first lens section.

5. The head-mounted display according to claim 1, wherein the first extended lens section is a Fresnel lens having an arc-shaped groove formed on the surface onto which the first image light is incident.

6. The head-mounted display according to claim 1, wherein the first extended lens section is a liquid crystal lens including a liquid crystal layer capable of controlling the light reflectivity.

7. The head-mounted display according to claim 1, wherein the first extended lens portion is provided with a light scattering member.

8. The head mounted display according to claim 7, wherein the light scattering member has a stronger light scattering intensity on the outer side in the radial direction of the optical axis of the first lens portion than on the inner side.

9. A head-mounted display as described in claim 1, having a second display panel arranged alongside the first display panel, wherein the lens unit includes a second lens portion that guides second image light emitted from the display area of ​​the second display panel to the pupil, and a second extension lens portion that is partially provided around the periphery of the second lens portion and that extends the lens surface onto which the second image light is incident.

10. The head-mounted display according to claim 9, wherein the second display panel is disposed so that its display surface is inclined relative to the display surface of the first display panel.

11. A head-mounted display as described in claim 9, wherein the first lens portion includes a first inclined surface, the second lens portion includes a second inclined surface that forms a first recess together with the first inclined surface, and the first extended lens portion and the second extended lens portion are provided in the first recess.

12. The head-mounted display according to claim 11, wherein the first extended lens unit and the second extended lens unit include a flat surface on either the top or bottom.

13. A head-mounted display as described in claim 11, wherein the first extended lens unit has optical characteristics that are continuously connected to the optical characteristics of the first lens unit that change from the optical axis of the first lens unit toward the radially outward direction, and the second extended lens unit has optical characteristics that are continuously connected to the optical characteristics of the second lens unit that change from the optical axis of the second lens unit toward the radially outward direction.

14. A head-mounted display as described in claim 11, wherein the first extended lens portion is a Fresnel lens having an arc-shaped groove formed on the surface onto which the first image light is incident, and the second extended lens portion is a Fresnel lens having an arc-shaped groove formed on the surface onto which the second image light is incident.

15. The head-mounted display according to claim 11, wherein the first extended lens unit and the second extended lens unit are liquid crystal lenses including a liquid crystal layer capable of controlling the light reflectivity.

16. A head-mounted display as described in claim 11, wherein the lens unit includes: a third extension lens portion that is partially provided around the first lens portion and that extends the lens surface onto which the first image light is incident; and a fourth extension lens portion that is partially provided around the second lens portion and that extends the lens surface onto which the second image light is incident; the first lens portion includes a third inclined surface; and the second lens portion includes a fourth inclined surface that, together with the third inclined surface, forms a second recess that is recessed in the opposite direction to the first recess; and the third extension lens portion and the fourth extension lens portion are provided in the second recess.

17. A head-mounted display as described in claim 1, wherein the first display panel is a flexible panel including a first display area and a second display area, and the lens unit includes: the first lens portion that guides the first image light emitted from the first display area to the pupil; a second lens portion that guides the second image light emitted from the second display area to the pupil; the first extension lens portion that expands the lens surface onto which the first image light is incident; and a second extension lens portion that is partially provided around the periphery of the second lens portion and expands the lens surface onto which the second image light is incident.

18. A head-mounted display to be worn on a user's head, comprising: a first display panel; a second display panel arranged alongside the first display panel such that its display surface is inclined relative to the display surface of the first display panel; and a lens unit including: a first lens portion that guides first image light emitted from a display area of ​​the first display panel to the user's pupil; a first expansion lens portion that is partially provided around the periphery of the first lens portion and expands the lens surface onto which the first image light is incident; a second lens portion that guides second image light emitted from a display area of ​​the second display panel to the pupil; and a second expansion lens portion that is partially provided around the periphery of the second lens portion and expands the lens surface onto which the second image light is incident; wherein the first lens portion includes a first inclined surface; and the second lens portion includes a second inclined surface that, together with the first inclined surface, forms a first depression; and the first expansion lens portion and the second expansion lens portion are provided in the first depression. a Fresnel lens having an arc-shaped groove formed on a surface onto which the first image light is incident and having optical characteristics that are continuously connected to the optical characteristics of the first lens unit, which change radially outward from the optical axis of the first lens unit; and a Fresnel lens having an arc-shaped groove formed on a surface onto which the second image light is incident and having optical characteristics that are continuously connected to the optical characteristics of the second lens unit, which change radially outward from the optical axis of the second lens unit. A head-mounted display.

19. A lens unit comprising: a first lens portion that guides first image light emitted from a display area of ​​a first display panel to a user's pupil; a first expansion lens portion that is partially provided around the periphery of the first lens portion and expands a lens surface onto which the first image light is incident; a second lens portion that guides second image light emitted from a display area of ​​a second display panel to the pupil; and a second expansion lens portion that is partially provided around the periphery of the second lens portion and expands a lens surface onto which the second image light is incident; wherein the first lens portion includes a first inclined surface, and the second lens portion includes a second inclined surface that forms a first depression together with the first inclined surface, and the first expansion lens portion and the second expansion lens portion are provided in the first depression.

Images