Optical system for a head mounted display device

Abstract

A system and method for providing an optical system for a head-mounted display (HMD) operable to modify virtual image light to correct one or more visual conditions of a user's eyes. The optical system includes a left optical subsystem for the left eye and a right optical system for the right eye. Each optical subsystem includes a first corrective portion and a second corrective portion, each having a lens assembly. The first lens assembly includes a first set of lenses having a first lens selectively adjustable along a first axis transverse to an optical path of the virtual image light. The second lens assembly includes a second set of lenses having a second lens selectively rotatable about a second axis transverse to the first axis. Selective adjustment of the first lens and the second lens facilitates correcting the visual condition of the user's eyes.

Description

[Technical field]

[0001] The present disclosure relates to optical systems for head mounted display devices. [Background technology]

[0002] A head mounted display device (HMD) is a display device that is worn on the user's head and has one or more display units for presenting visual content to the user. HMDs have become popular to provide virtual reality (VR) or augmented reality (AR) experiences or to facilitate the presentation of games or audiovisual media. The display units are typically miniaturized and may include, for example, CRT, LCD, liquid crystal on silicon (LCos), or OLED technologies. Some HMDs are binocular, with the potential to display a different image to each eye. This capability is used to display stereoscopic images to present a more immersive user experience. Existing HMDs do not take into account a user's poor or insufficient vision. For example, a person with astigmatism, myopia, or hyperopia (also known as presbyopia) may wear glasses to correct one or more of these conditions. However, previously implemented HMDs display visual content to a user without adapting the virtual light to correct for these conditions. At least some HMDs do not have sufficient space in front of or around the user's eyes to allow a user to wear vision correction glasses and the HMD. As a result, for a user wearing glasses with poor or insufficient vision, visual content may appear out of focus or unclear, which may detract from the overall user experience. Summary of the Invention [Means for solving the problem]

[0003] The head mounted display may be summarized as including a virtual image display unit and an optical system for modifying received virtual image light to correct one or more visual conditions of the user. The optical system includes a left optical subsystem and a right optical subsystem that are operable to modify virtual image light received from the virtual image display to correct left and right eye visual conditions, respectively. Each of the left and right optical subsystems includes a first corrective portion and a second corrective portion. The first corrective portion and the second corrective portion are independently selectively adjustable to correct one or more visual conditions. The first corrective portion is selectively adjustable to correct a first set of visual conditions and the second corrective portion is selectively adjustable to correct a second set of visual conditions.

[0004] The optical system is operable to modify the virtual image light to correct myopia, hyperopia, and astigmatism of the user's eye. One of the first and second corrective portions includes a first set of lenses arranged in sequence along an optical path of the virtual image light. An actuator is physically coupled to each of the lenses in the first set of lenses and configured to move each of the lenses along a first axis that is transverse to the optical path. The first set of lenses is selectively adjustable by the one or more actuators to correct a first set of visual conditions including myopia and hyperopia. The other of the first and second corrective portions includes a second set of lenses arranged in sequence along an optical path of the virtual image light. An actuator is physically coupled to each of the lenses in the second set of lenses and configured to rotate each of the lenses about a second axis that is transverse to the first axis. The second set of lenses is selectively adjustable by the one or more actuators to correct a second set of visual conditions including astigmatism.

[0005] In some embodiments, the optical system is an integral, non-removable part of the HMD. In some embodiments, the optical system is selectively installable and removable from the body of the HMD. The HMD may include a cavity for selectively receiving the optical system. The HMD may receive user input via its own input device or via a communication interface of the HMD. In some embodiments, a controller of the HMD or optical system sends control signals to actuators coupled to the first set of lenses and / or actuators coupled to the second set of lenses to cause the actuators to move or rotate the lenses to a desired position to correct the user's visual condition. In some embodiments, user input via a mechanical input device of the HMD may apply a mechanical force that causes the actuators to move or rotate the lenses. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is an overhead plan view showing a head mounted display having an optical system according to one or more implementations.

[0007] [Diagram 2] FIG. 2 illustrates an optical subsystem of the head mounted display optical system of FIG. 1.

[0008] [Diagram 3] FIG. 3 is an overhead plan view showing a first set of lenses of the optical subsystem of FIG. 2.

[0009] [Figure 4A] FIG. 2 is an overhead plan view showing a second set of lenses of the optical subsystem in accordance with one embodiment. [Figure 4B] FIG. 2 is a front plan view showing one lens of the second set of lenses.

[0010] [Figure 5A]FIG. 2 is an overhead plan view showing a second set of lenses of the optical subsystem in accordance with one embodiment. [Figure 5B] FIG. 5B is a front plan view of a second set of lenses of FIG. 5A.

[0011] [Figure 6] FIG. 2 is an overhead perspective view showing the exterior of the head mounted display of FIG. 1. [Figure 7] FIG. 2 is a schematic block diagram of a head mounted display.

[0012] [Figure 8] FIG. 2 is a bottom perspective view of a head mounted display having a selectively installable optical system according to one or more embodiments. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] In the following description, certain specific details are set forth to provide a thorough understanding of the various disclosed implementations. However, those skilled in the art will recognize that the implementations can be practiced without one or more of these specific details, or with other methods, components, materials, etc. In other instances, well-known structures related to computer systems, server computers, and / or communication networks have not been shown or described in detail to avoid unnecessarily obscuring the description of the implementations.

[0014] Unless the context otherwise requires, throughout this specification and the claims that follow, the word "comprising" is synonymous with "including" and is inclusive or open-ended (i.e., does not exclude additional, unrecited elements or method acts). As used herein, the term "set" (e.g., a "set of items") is to be construed as a non-empty collection comprising one or more members or instances, unless otherwise indicated or contradicted by context.

[0015] References throughout this specification to "one implementation" or "an implementation" mean that a particular feature, structure, or characteristic described in connection with an implementation is included in at least one implementation. Thus, the appearances of the phrases "in one implementation" or "in an implementation" in various places throughout this specification are not necessarily all referring to the same implementation. Furthermore, particular features, structures, or characteristics may be combined in any suitable manner in one or more implementations.

[0016] As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. It should also be noted that the term "or" is used throughout its meaning, including "and / or," unless the context clearly dictates otherwise.

[0017] The headings and abstracts provided herein are for convenience only and do not interpret the scope or meaning of the implementations.

[0018] FIG. 1 illustrates an overhead plan view of a head mounted display device (HMD) 100 according to one or more embodiments. The HMD 100 is configured to present a virtual reality (VR) to a user 104, such as through a corresponding video presented at a display rate of 30 frames (or images) per second or 90 frames per second, while other embodiments of similar systems may present an augmented reality display to the user 104. The HMD 100 provides a rectified virtual image light 102 to a left eye 105l and a right eye 105r of the user 104. The HMD 100 includes one or more virtual image display units 106 attached to or within a frame 108. The virtual image display units 106 generate the virtual image light 102 for the user to perceive visual content. The HMD 100 may further include a set of left and right lenses 107l and 107r provided on the emission side of the virtual image display units 106. The left and right sets of lenses 107l and 107r may focus, collimate, or otherwise modify the virtual image light 102 after it is emitted from the virtual image display unit 106. The left and right sets of lenses 107l and 107r may include, for example, Fresnel lenses that refract or collimate the virtual image light 102.

[0019] The HMD 100 also includes an optical system 112 having optical properties that are selectively alterable to correct one or more visual conditions of the user. For example, the optical system 112 is selectively adjustable to correct one or more of myopia, hyperopia, and astigmatism. The virtual image light 102 emitted from the virtual image display unit 106 travels along an optical path 126 through the optical system 112, which modifies the virtual image light 102 according to the optical properties of the optical system 112 and emits the corrected virtual image light 114 to the left and right eyes 105l and 105r of the user, respectively.

[0020] The frame 108 is a mounting structure for supporting the HMD 100 on the head of the user 104. The frame 108 includes a body 116 having a front portion 118 and a viewing portion 120 opposite the front portion 118 that is positioned in front of the user's eyes 105l and 105r for viewing generated visual content. The HMD 100 includes one or more support structures for selectively mounting the HMD 100 on the user's head. For example, the HMD 100 of FIG. 1 includes left and right temples 122l and 122r for hanging on the left and right ears 124l and 124r, respectively, of the user 104. In some embodiments, the HMD 100 may include another support structure that wraps around the back of the head of the user 104, such as a strap connected to the body 116. A nose assembly (not shown) of the HMD 100 may support the body 116 on the nose of the user 104. Frame 108 may be shaped and sized to position optical system 112 in front of one of user's eyes 105l and 105r. Frame 108 is shown simplified to resemble glasses for purposes of explanation, but it should be understood that in practice more sophisticated structures (e.g., goggles, integrated headband, helmet, straps, etc.) may be used to support and position HMD 100 on the head of user 104.

[0021] The virtual image display unit 106 generates virtual image light 102, which passes through and is selectively modified by the optical system 112. The virtual image display unit 106 includes a left display unit 106l for generating image light for presentation to the left eye 105l and a right display unit 106r for generating image light for presentation to the right eye 105r. The virtual image display unit 106 may include a liquid crystal display (LCD), a light emitting diode (LED), a cathode ray tube (CRT), a liquid crystal on silicon (LCos), or other light emitting technology for generating the virtual image light 102. The virtual image display unit 106 in the embodiment shown in FIG. 1 is positioned at a front portion of the HMD 100 and emits light in a rearward direction toward the eyes of the user 104. In some embodiments, the virtual image display unit 106 may include a waveguide to guide (e.g., reflect, refract) the virtual image light 102 toward the eye 105l or 105r, such that the light emitting elements of the virtual image display unit 106 do not need to be directly in front of the eyes 105l and 105r in order for the user 104 to perceive visual content. In some embodiments, the front portion 118 of the body 116 may be at least partially transparent, such that the user 104 perceives external content to provide an augmented reality experience. Although not shown here, some embodiments of the HMD 100 may include various additional internal and / or external sensors, such as cameras to perform pupil tracking separately for each eye 105l and 105r, to track the position and orientation of the head (e.g., as part of head tracking), to track various other types of movements and postures of the user's body, and to record external images (e.g., of the environment).

[0022] While the described techniques may be used in some embodiments with a display system similar to that shown in FIG. 1, in other embodiments, other types of display systems may be used, including those having a single optical lens and display device, or multiple such optical lenses and display devices. Non-exclusive examples of such other devices include cameras, telescopes, microscopes, binoculars, spotting scopes, surveying scopes, and the like. Additionally, the described techniques may be used with a variety of display panels or other display devices that emit light to form images, which may be viewed by one or more users through one or more optical lenses. In other embodiments, a user may view one or more images through one or more optical lenses that have been created in a manner other than through a display panel, such as an image created on a surface that reflects some or all of the light from another light source.

[0023] The virtual image light 102 may include a plurality of light rays that travel from each of the virtual image display units 106 along an optical path 126 through the optical system 112 toward the viewing portion 120. The optical system 112 modifies some or all of the plurality of light rays to provide a corrected virtual image light 114. The optical system 112 includes a plurality of optical subsystems 130, including a left optical subsystem 130l for modifying the virtual image light 102 for the left eye 105l and a right optical subsystem 130r for modifying the virtual image light 102 for the right eye 105r. Each of the left and right optical subsystems 130l and 130r may be independently adjustable to correct poor or insufficient vision of the left eye 105l and the right eye 105r, respectively.

[0024] FIG. 2 illustrates a diagram 200 of the optical subsystem 130 (e.g., optical subsystem 130l or 130r) of FIG. 1 in accordance with one or more embodiments. The optical subsystem 130 includes a receiving portion 202 for receiving an initial virtual image light 204 corresponding to the virtual image light 102 for one eye and an emitting portion 206 for emitting the corrected virtual image light 114. The optical subsystem 130 further includes a first corrective portion 210 positioned at a first position along the optical path 126 ( FIG. 1 ) of the multiple light beams 204 and a second corrective portion 212 positioned at a second position downstream of the first position along the optical path 126. The first corrective portion 210 and the second corrective portion 212 each include a set of lenses and are operable to correct a vision deficiency or poor vision of the user 104. The first corrective portion 210 may correct a different set of visual conditions than the second corrective portion 212. For example, one of the first and second correction portions 210 and 212 may correct myopia or hyperopia, while the other of the first and second correction portions 210 and 212 corrects astigmatism. The optical properties of the first and / or second correction portions 210 and 212 may be adjusted as a result of receiving a stimulus, such as an electronic signal or application of a mechanical force, as described in more detail below. Although two correction portions 210 and 212 are described with respect to FIG. 2, the optical system 112 may include a single correction portion in some embodiments. For example, the optical system 112 may include one of the first and second correction portions 210 and 212 to correct myopia and / or hyperopia, and the other of the first and second correction portions 210 and 212 may be omitted. As another example, the optical system 112 may include one of the first corrective portion 210 and the second corrective portion 212 to correct astigmatism, and the other of the first corrective portion 210 and the second corrective portion 212 may be omitted.

[0025] The first correction portion 210 is operable to apply a first correction to the initial virtual image light 204 to correct a first set of visual conditions of the user 104. The initial virtual image light 204 includes a plurality of light rays 205, each of which has a particular set of attributes (e.g., color, direction, brightness) for causing the user 104 to perceive visual content. In operation, the first correction portion 210 may receive a first stimulus 214, which causes a first optical characteristic of the first correction portion 210 to change or modify the initial image light 204 as a correction for the first set of visual conditions. The first correction portion 210 may then emit an intermediate virtual image light 216, which is received by the second correction portion 212. The intermediate virtual image light 216 includes a plurality of light rays 217 that at least in part correspond to the plurality of light rays 205. If the user does not have the first set of visual conditions, the intermediate virtual image light 216 may be substantially unmodified from the initial virtual image light 204. That is, if the first correction portion 210 receives a first stimulus 214 that passes the initial virtual image light to the first correction portion 210 without substantial modification because the user does not require correction for the first set of visual conditions, the intermediate virtual image light 216 may have the same attributes as the received initial virtual image light 204.

[0026] The second correction portion 212 is operable to apply a second correction to the intermediate virtual image light 216 (or to the initial virtual image light 204 in an implementation in which the first correction portion 210 is not present) to correct a second set of visual conditions of the user 104. The second correction portion 212 may receive a second stimulus 218, which causes a second optical characteristic of the second correction portion 212 to change and modify the intermediate virtual image light 216 as a correction for a second set of visual conditions, which may be distinct from the first set of visual conditions. The second correction portion 212 may then emit a corrected virtual image light 208, which includes a plurality of light rays that at least in part correspond to the light rays 216. Similar to the first correction portion 210, the corrected virtual image light 114 may be substantially unmodified from the intermediate virtual image light 216 if the user 104 does not suffer from any of the second set of visual conditions. That is, if the second stimulus 218 does not cause the second correction portion to correct any one or more of the second set of visual conditions, then the second correction portion 212 does not need to modify the intermediate virtual image light 216.

[0027] 3 is a diagram 300 illustrating an overhead plan view of a set of lenses 302 of a corrective portion, according to one or more embodiments. In particular, the set of lenses 302 is a lens of one of the corrective portions of the first corrective portion 210 and the second corrective portion 212 of FIG. 2. The set of lenses 302 includes a first lens 304 and a second lens 306 arranged in succession along the optical path 126 of the virtual image light 102. Each of the set of lenses 302 may have a width W that is greater than a thickness T. In some embodiments, the lenses 302 may have a substantially rectangular shape, for example, when viewed from a perspective along the optical path 126. A ray 308 of the virtual image light 102 traveling along the optical path 126 is incident on and travels through at least a portion of the first lens 304 and at least a portion of the second lens 306. At least one of the first lens 304 and the second lens 306 is selectively adjustable transverse to the optical path 126 to modify attributes of the light beam 308. For example, the set of lenses 302 may be adjustable to set the optical power or focus of the optical system 112 to correct for a visual deficiency or poor vision of the user 104. The first lens 304 may be selectively movable along an axis 310 that is transverse to the optical path 126, and the second lens is also selectively movable along an axis 312 that is transverse to the optical path 126 and spaced along the optical path 126 from the first axis 310. In some embodiments, a single one of the first lens 304 and the second lens 306 may be movable relative to the other one of the first lens 304 and the second lens 306. In some embodiments, each of the first lens 304 and the second lens 306 is movable relative to the other of the first lens 304 and the second lens 306 .

[0028] The first lens 304 and the second lens 306 have respective widths W extending along the first axis 310 and the second axis 312. The first lens 304 may have different properties at different portions along the width W of the first lens 304. The first portion 304a of the first lens 304 may have a thickness and surface curvature that is different from the thickness and / or curvature of the second portion 304b. For example, the first portion 304a may have a convex lens surface and a first thickness in the thickness direction T, while the second portion 304b may have a concave lens surface and a second thickness that is different from the first thickness. The first surface 314 of the first lens 304 may have a different shape than the second surface 316 of the first lens 304, for example, the first surface 314 may be flat along the width W, while the second surface 316 may be curved (e.g., convex, concave, serpentine) along the width W. In some embodiments, the first lens 304 may have a curved surface along its entire length. In some embodiments, the first lens 304 may have a surface that is curved in some portions and flat in others. The flat portions may be used as non-corrective portions that do not modify the virtual image light 102 to correct a vision condition.

[0029] The second lens 306 may also have different properties at different portions along the width W of the second lens 306. The first portion 306a of the second lens 306 may have a thickness and surface curvature that is different from the thickness and / or curvature of the second portion 306b. For example, the first portion 306a may have a convex lens surface and a first thickness in the thickness direction T, while the second portion 306b may have a concave lens surface and a second thickness that is different from the first thickness. The first portion 306a of the second lens 306 may have different properties from the first portion 304a of the first lens 304. The first surface 318 of the second lens 306 may have a different shape than the second surface 320 of the second lens 306, for example, the first surface 320 may be curved along the width W, while the second surface 322 may be flat along the width W. In some embodiments, the second lens 306 may have a curved surface along its entire length. In some embodiments, the second lens 306 may have a surface that is curved in one portion and flat in another portion. The flat portion may be used as a non-corrective portion that does not modify the virtual image light 102 to correct a vision condition. In some embodiments, the first lens 304 and the second lens 306 may be Alvarez lenses or Lohmann lenses that have opposing complementary refractive surfaces (e.g., with a cubic profile) and oppositely facing flat surfaces. For example, the opposing surfaces of the first lens 304 and the second lens 306 (surfaces that face away from each other) may have substantially flat surfaces, while the opposing surfaces of the first lens 304 and the second lens 306 (surfaces that face each other) may have opposite, complementary curved profiles.

[0030] The first lens 304 and / or the second lens 306 may be selectively moved along axes 310 and 312, respectively, to correct a first set of vision conditions, which may include myopia and hyperopia. The set of lenses 302 may include a first actuator 322 that is physically coupled to the first lens 304 and configured to move the first lens 304 along the axis 310. The first actuator 322 may be moved as a result of receiving a first stimulus 214, as described above with respect to FIG. 2, such as as a result of a mechanical force applied to a dial, button, knob, or the like, or as a result of the optical system 112 receiving an electronic signal to move the first actuator 322. The set of lenses 302 may also include a second actuator 324 that is physically coupled to the second lens 306 and configured to move the second lens 306 along the axis 312. The second actuator 324 may be moved as a result of the stimulus, similar to the relationship between the first actuator 322 and the first stimulus 214. The first actuator 322 and the second actuator 324 may be moved independently of one another. Thus, the first actuator 322 may move the first lens 304 relative to the second lens 306, and the second actuator 324 may move the second lens 306 relative to the first lens 304. The first lens 304 and the second lens 306 may be moved relative to one another to provide optical characteristics that correct for a visual condition. In some embodiments, one lens of the first lens 304 and the second lens 306 may be fixed, and the other lens of the first lens 304 and the second lens 306 is adjustable relative to the fixed lens.

[0031] The first lens 304 and the second lens 306 may be aligned along the optical path 126 of the virtual image light 102 to correct one or more of the first set of vision conditions. For example, the first portion 304a of the first lens 304 may be aligned with the first portion 306a of the second lens 306 to correct myopia. As another example, the second portion 304b of the first lens 304 may be aligned with the second portion 306b of the second lens 306 to correct hyperopia. In some embodiments, other portions of the first lens 304 and the second lens 306 may be aligned to move the set of lenses 302 to a non-corrective state. In some examples, portions of the first lens 304 and the second lens 306 may be aligned along the optical path 126 to match the optical prescription of the user 104. For example, the first lens 304 and the second lens may be positioned relative to one another to adjust the refractive power (i.e., diopters) of the set of lenses 302. In some embodiments, the set of lenses 302 may provide a correction that corresponds to a "spherical" or refractive portion of an optical prescription. Although only two lenses are shown and described as making up the set of lenses 302, the set of lenses 302 may include additional lenses without departing from the scope of the present disclosure.

[0032] 4A illustrates a configuration 400 of a set of lenses 402 of a correction portion according to one or more embodiments. In particular, the set of lenses 402 is a lens of the other of the first and second correction portions 210 and 212 other than the set of lenses 302. The set of lenses 402 includes a first lens 404 and a second lens 406, which are arranged in succession along the optical path 126 of the virtual image light 102, either in front of or behind the set of lenses 302. The first lens 404 and the second lens 406 may have a substantially circular shape, for example, when viewed in a direction parallel to the optical path 126. A light ray 408 of the virtual image light 102 traveling along the optical path 126 is incident on and travels through at least a portion of the first lens 404 and the second lens 406.

[0033] The first lens 404 and the second lens 406 are selectively rotatable about axes parallel to the optical path 126. The first lens 404 is rotatable about a first axis 410 that is transverse to the axes 310 and 312. The second lens 406 is also rotatable about a second axis 412 that is transverse to the axes 310 and 312. In this embodiment, the first axis 410 is coaxial with the second axis 412. In some embodiments, a single one of the first lens 404 and the second lens 406 may be rotatable relative to the other one of the first lens 404 and the second lens 406. In such an example, the other one of the first lens 404 and the second lens 406 may not be rotatable. In some embodiments, each of the first lens 404 and the second lens 406 is rotatable relative to the other one.

[0034] A first actuator 414 is physically coupled to the first lens 404 and is operable to selectively rotate the first lens 404 about a first axis 410. A second actuator 416 is physically coupled to the second lens 406 and is operable to selectively rotate the second lens 406 about a second axis 412. By way of example, the first and second actuators 414 and 416 may be coupled to gears or teeth associated with the first lens 404 and the second lens 406, respectively, to rotate the lenses in response to a force applied by the actuators. The first and second actuators 414 and 416 may position particular portions of the first and second lenses 404 and 406, respectively, in the optical path 126 to modify attributes of the light beam 408. For example, the set of lenses 402 is selectively adjustable to correct optical aberrations of the user's 104 vision, such as astigmatism. The set of lenses 402 may be adjustable to provide correction for the "cylinder" and "axial" portions of the optical prescription. However, in some implementations, the set of lenses 402 may be adjustable to provide correction for the "spherical" or refractive portion of the optical prescription.

[0035] The first lens 404 and the second lens 406 may be Alvarez or Roman lenses (sometimes known as Alvarez-Roman lenses). In some embodiments, the Alvarez or Roman lenses have a circular shape when viewed from their optical surface. In some embodiments, the Alvarez lenses have a rectangular shape when viewed from their optical surface. The controller described herein operates the first and second actuators 414 and 416 to position portions of the first lens 404 and the second lens 406 in the optical path 126 to modify attributes of the light beam 408, as described herein. For example, in an embodiment in which one or both of the first lens 404 and the second lens 406 are Alvarez lenses, the relative positions of the first lens 404 and the second lens 406 may be adjusted to provide a profile (e.g., a circular profile, a cylindrical profile, an elliptical profile) that produces a phase change in the light beam 408 that corrects the visual condition of the user 104.

[0036] FIG. 4B shows a front plan view of the first lens 404 along line AA in FIG. 4A. The first lens 404 may have different properties at different angular positions or regions about the first axis 410. The second surface 418 of the first lens 404 may vary along the width W of the first lens 404 to form a curved surface to provide different optical aberration corrections at different angular positions about the axis 410. For example, the second surface 418 may be asymmetric along different angular positions about the axis 410. As shown in FIG. 4B, for example, the first lens 404 may have multiple regions 420, each of which has a center at a different angular position θ about the axis 410. Each region 420 may have different optical properties to apply different corrections, such as astigmatism corrections, to optical aberrations of the eye or vision of the user 104. For example, the center of a first region 420a is at an angular position θ1, the center of a second region 420b is at an angular position θ2, and so on up to N regions. Although each region 420 is shown in FIG. 4B as not intermingled with other regions 420, this is for illustrative purposes only and is not intended to be limiting. Regions 420a, 420b, 420c,...420N may overlap one another in at least some embodiments.

[0037] In FIG. 4B, the first lens 404 is at an angular position θ1, which causes the optical path 126 of the virtual image light ray 408 to pass through the second region 420b. Thus, the attributes of the light ray 408 are modified, at least in part, according to the optical aberration correction properties of the second region 420b. The first actuator 414 may selectively rotate the first lens 404 to cause the optical path 126 of the light ray 408 to pass through a different region than the second region 420b to provide a different optical aberration correction. Each region 420 may refract the light ray 408 of the virtual image light 102 at an angle different from the angle at which the light ray 408 is refracted in the other regions 420. A first surface 422 of the first lens 404 opposite the second surface 418 may have a different shape than the second surface 418, for example, the first surface 422 may be flat or planar, such that the light rays 408 entering the first lens 404 are not refracted.

[0038] The second lens 406 may have a similar or identical circular shape as the first lens 404, when viewed parallel to the optical path 126. The second lens 406 may have a first surface 424 that receives the light rays 408 emitted from the first lens 404, and a second surface 426 that emits the light rays 408. The first surface 424 may be similar or the same as the second surface 418 of the first lens 404. That is, the first surface 424 may vary along the width W of the second lens 406 to form a curved surface, providing different optical aberration corrections at different angular positions about the axis 412 to refract the rays 408 of the virtual image light 102 in a manner similar to that described for the first lens 404. In some embodiments, the first surface 424 of the second lens 406 may be complementary to the second surface 418, such that the second surface 418 and the first surface 424 may be disposed in contact with one another with no space between them. In some embodiments, the second surface 426 of the second lens 406 may have a flat or planar shape that does not refract the rays 408 of the virtual image light 102 incident thereon. As described above with respect to the first lens 404, the second actuator 416 may selectively rotate the second lens 406 to align the optical axis 126 with an area of ​​the first surface 424 corresponding to a particular angular position for correcting optical aberrations of the user's 104 vision.

[0039] The first actuator 414 and the second actuator 416 may rotate the first lens 404 and the second lens 406 in coordination with each other, respectively, to achieve a desired optical aberration correction for the vision of the user 104. The angular position θ of the first lens 404 and the angular position θ of the second lens 406 may be adjusted to provide the virtual image light 102 with an optical correction that compensates for astigmatism in the vision of the user 104. The optical correction may correspond to an optical prescription indicating the spherical power, cylindrical power, and axis of the eye of the user 104. The first lens 404 and the second lens 406 may operate in coordination to match other indications of the optical correction other than the correction of astigmatism. Additionally, the angular position θ of the first lens 404 and the second lens 406 may be adjusted such that the set of lenses 402 does not provide optical correction for a vision condition such as astigmatism.

[0040] In some embodiments, the set of lenses 402 may include three or more lenses. For example, the set of lenses may include one or more additional lenses disposed between the first lens 404 and the second lens 406. The one or more additional lenses may each have an optical surface on one or both sides with a curvature that varies along the width W of the lens. As another example, a pair of lenses similar or identical to the first and second lenses 404 and 406 may be provided before or after the lenses 404 and 406 along the optical path 126. The one or more additional lenses may have actuators associated with them for selectively rotating the lenses to adjust the area of ​​the lenses through which the optical path extends.

[0041] 5A and 5B show a configuration 500 of a first lens 404 and a second lens 406 according to one or more embodiments. The first lens 404 and the second lens 406 of the configuration 500 have the same size and shape as the configuration 400, except that the axis 410 of the first lens 404 is not coaxial with the axis 412 of the second lens 406. In some embodiments, one or both of the first lens 404 and the second lens 406 may be movable along an axis transverse to the optical path 126 to adjust the optical aberration correction attributes.

[0042] FIG. 6 shows an exterior 600 of an HMD 100 according to one or more embodiments. The HMD 100 includes a set of straps 602 attached to the body 116. The set of straps 602 can be used to selectively and securely attach the HMD 100 to the head of the user 104 to view visual content. The body 116 can include a control panel 604 for controlling various aspects of the HMD 100. The control panel 604 can include one or more input devices for controlling optical properties of the optical system 112 to correct the visual content for the visual condition (e.g., myopia, hyperopia, astigmatism) of the user 104. The input devices can be coupled to the first and second actuators 322 and 324 to control the positions of the first lens 304 and the second lens 306 along the first axis 310 and the second axis 312, respectively. The input device may be coupled to a first actuator 414 and a second actuator 416 to control the angular positions of the first lens 404 and the second lens 406 about the first axis 410 and the second axis 412, respectively.

[0043] The input devices may be mechanical devices mechanically coupled to the corresponding lenses and configured to control them. For example, the input devices may be knobs or dials mechanically linked to actuators of the corresponding lenses, e.g., via gears or shafts. Interaction with the mechanical input devices by the user 104 may apply a mechanical force to the corresponding actuators to adjust the position of the lenses. The input devices may be electrical devices electrically coupled to the corresponding lenses and configured to control them. As an example, the input devices may cause an electrical signal to be sent to a controller in response to an interaction by the user 104, which in turn may send a control signal to the corresponding actuators to adjust the position of the lenses. Non-limiting examples of electrical input devices of the control panel 604 include a keypad having a set of keys for providing alphanumeric input or navigating a menu, or a dial or knob electrically coupled to a controller to operate one or more actuators. The exterior 600 may include a display 606 for displaying information about the HMD 100, such as the current optical settings of the optical system 112. In some embodiments, the display 606 may be a touch screen input device with which the user 104 can interact to control the optical system 112 .

[0044] In some embodiments, a user may adjust the optical settings of the optical system 112 with respect to visual content presented by the virtual image display unit 106. For example, a user wearing the HMD 100 may interact with the control panel 604 or other input device (e.g., a handheld controller, mouse, keyboard) to adjust the optical settings in response to menus or other visual content displayed by the virtual image display unit 106. As an example, the user may navigate through menus and provide user input via the control panel 604 or other input device, in response to which the optical settings of the optical system 112 may be altered by the user input. As another example, the HMD 100 may adjust the optical settings of the optical system 112 in real-time response to user input related to visual content perceived by the user 104. The user may initiate a visual test in the HMD 100 that causes visual content, such as a test pattern, to be displayed on the virtual image display unit 106 and prompts the user to provide input related to the clarity of the visual content. As a result of receiving the input, the HMD 100 may automatically adjust the optical settings of the optical system 112 to improve the clarity of the visual content to enhance the experience of the user 104.

[0045] FIG. 7 is a block diagram 700 illustrating the interconnection of various parts of the HMD 100, according to one or more embodiments. The HMD 100 includes a controller 702 with one or more processors 704 and a memory 706 that stores a set of instructions that, when executed by the one or more processors 704, cause the HMD 100 to perform one or more operations described herein. As a non-limiting illustrative example, the memory 706 may include a read-only memory (ROM) and a random access memory (RAM), and may be in the form of a solid-state memory or a hard disk drive. The HMD 100 also includes a communication interface 708 electrically coupled to the controller 702 for transmitting and receiving communications with external devices. The communication interface 708 may include one or more wireless transceivers, such as a Wi-Fi transceiver, a cellular transceiver, a Bluetooth transceiver, etc., for wirelessly transmitting and receiving communications to and from external devices, such as a network router or a computing device (e.g., a laptop, desktop, tablet, mobile device). The communications interface 708 may include a wired communications port, such as a universal serial bus port, a network interface port, etc., for wired communications with external devices.

[0046] The HMD 100 may include a set of input devices 710 electrically coupled to the controller 702 for providing user input to the HMD 100. One or more of the set of input devices 710 may be provided on the exterior 600 of the HMD 100, for example as part of the control panel 604. The controller 702 may also be electrically coupled to and configured to control the virtual image display unit 106 and / or the display 606, if included. In some embodiments, the controller 702 may include one or more graphics processing units for generating the virtual image light 102 via the virtual image display unit 106.

[0047] The controller 702 is electrically coupled to the optical system 112 and configured to control the optical system 112 to adjust its optical properties as described herein. In particular, the controller 702 is electrically coupled to and configured to control a first corrective portion 712 of the left optical subsystem 130l, a second corrective portion 714 of the left optical subsystem 130l, a first corrective portion 716 of the right optical subsystem 130r, and a second corrective portion 718 of the right optical subsystem 130r. The first corrective portions 712 and 716 include one of the set of lenses 302 and the set of lenses 402, and the second corrective portions 714 and 718 include the other of the set of lenses 302 and the set of lenses 402.

[0048] The controller 702 is electrically coupled to the actuators 720 of the corrective portions 712, 714, 716, and 718 to control the position of the lens 722 of the optical system 112. Specifically, the controller 702 sends signals (e.g., control signals) to the actuators 720 to cause the actuators 720 to move or rotate the lenses 722 coupled thereto. As described above, the position (e.g., lateral offset, angular position θ) of the lens 722 may be controlled to modify the optical characteristics of the first corrective portions 712 and 716 and / or the second corrective portions 714 and 718. The controller 702 may send signals to control the optical subsystem 112 in response to receiving an input. For example, the controller 702 may adjust the optical characteristics of the optical system 112 in response to receiving an input provided via the input device 710. As another example, the controller 702 may adjust the optical properties of the optical system 112 in response to receiving input via the communications interface 708 .

[0049] The inputs received by the controller 702 may have a particular format. The inputs may indicate a prescription for the right eye and / or a prescription for the left eye. For each eye, the inputs may indicate a refractive or spherical power (sometimes denoted as SPH or S), a cylindrical power (sometimes denoted as CYL or C), and / or an axis (usually 0-180). The inputs may include inputs for the left optical subsystem 130l and the right optical subsystem 130r.

[0050] Adjustments to the optical settings of the optical subsystem 112 may be adjusted in real-time through feedback provided by the user 104. The controller 702 may initiate a test to determine adjustments to be made to the optical settings of the optical system 112. The test may include causing the virtual image display unit 106 to display certain visual content, such as a test pattern or detailed visual image, and prompting the user to provide feedback via the input device 710 or the control panel 604. The user 104 may provide feedback indicating that the appearance of the visual content (e.g., text, images) appears unclear. The controller 702 may adjust the optical settings of the optical system 112 and ask the user 104 whether the adjustments have improved the clarity of the appearance of the visual content. This process may be repeated until the user 104 is satisfied with the clarity of the visual content. The test may be performed in response to receiving user input from the user 104 via the input device 710 or the control panel 604.

[0051] Input via the communication interface 708 may be provided by a device (e.g., laptop, desktop, mobile device, controller) as a result of user interaction. The computing device may include a set of instructions (e.g., application, program) with which the user can interact to cause the computing device to transmit a communication including information indicating or representative of optical characteristics for modifying the virtual image light 102 to correct the visual condition of the user 104. As described above, the user may enter input into the input device 710 or computing device as a prescription provided by a medical professional, which may have a predetermined format.

[0052] The controller 702 may determine signals to send to the actuators 720 in response to receiving inputs from the input devices 710 or the communication interface 708. One or more of the processors 704 may access a data structure, stored, for example, in the memory 706, that indicates the control signals to send to the corresponding actuators 720. The data structure may be an array, look-up table, or other reference structure in which input data is associated with a corresponding output (i.e., control signal) to send to a particular actuator 720. In some implementations, the controller 702 may store information in the memory 706 that indicates a current state of the optical system 112 (e.g., the current state of the actuators 720), from which the controller 702 may determine to make adjustments to the actuators 720 to accommodate the received inputs.

[0053] In some embodiments, the HMD 100 may be configured to detect visual conditions of the user's eyes 105l and 105r and automatically adjust the optical system 112 as a result of the detection. In such embodiments, the HMD 100 may include one or more sensors 724 that detect information about the user's eyes 105l and 105r and provide measurements to the controller 702, which adjusts the optical system 112 accordingly. The HMD 100 may also include one or more light emitting elements 726 coupled to the controller 702 for use in conjunction with the sensor 724 to obtain information. The light emitting elements 726 may emit light at an angle and with particular characteristics (e.g., frequency, intensity) such that the light is reflected and received by the sensor 724. The sensor 724 may determine information about the user's eyes based on the light detected from the user's eyes. As a result of the information about the user's 104 eyes being determined, the controller 702 may adjust the optical characteristics of the optical system 112 accordingly. Such information may include information indicative of the topology of the cornea, which is processed by the controller 702 to determine control signals to send to the actuators 720 to adjust the optical system 112 so that the user 104 can resolve the virtual image light 102 as visual content.

[0054] 8 illustrates an embodiment of an HMD 800 having an optical subsystem 802 that is selectively installable and removable from the HMD 800. In particular, the HMD 800 has a cavity 804 disposed between a front portion 806 and a viewing portion 808 and sized and shaped to receive the optical subsystem 802. The optical system 802 has a body 810 sized and shaped to fit snugly within the cavity 804. The optical system 802 houses left and right optical subsystems 130l and 130r (FIG. 1), each of which includes one or both of the first and second corrective portions 210 and 212 described herein. The HMD 800 is configured to securely and selectively retain the optical system 802 when the body 810 is inserted therein. The body 810 may have fasteners or other features 812 that, when inserted into the cavity 804, for example, engage corresponding features in the cavity 804 to hold the optical subsystem 112. The HMD 800, in some implementations, may have a set of doors 814 that open to allow insertion of the optical system 804, but are otherwise maintained in a closed state to prevent dust and debris from entering the HMD 800.

[0055] A front side 816 of the body 810 includes a receiving portion 202 for receiving the virtual image light 102 from the virtual image display unit 106, as described above. A rear side 818 of the body 810 includes left and right emitting portions 206l and 206r for emitting rectified virtual image light 114 for viewing by the user 104. The optical subsystem 812 may have one or more electrical contacts 820 exposed on an exterior surface that are sized and shaped to engage corresponding electrical contacts in the cavity 804 to establish an electrical connection through which signals and power are transmitted to actuators of the optical system 802.

[0056] In some embodiments, the optical system 802 may include a controller, separate from the controller 702, for sending control signals to the actuators 720. The independent controller of the optical system 802 may receive signals or information from the controller 702 or the communications interface 708 and adjust the optical properties of the left and right optical subsystems 130l and 130r in response to the received signals or information. In some examples, the user 104 may interact with an input device 822 external to the HMD 800 to adjust the optical properties, as described above with respect to the control panel 604.

[0057] In some embodiments, instead of or in addition to the electrical contacts 820, the optical subsystem 812 may include a mechanical interface (e.g., a dial, a knob) for selectively adjusting the optical settings of the left and right optical subsystems 130l and 130r. The mechanical interface may be manipulable by a user to adjust the optical settings. In some embodiments, the mechanical interface may interface with a corresponding mechanical interface in the cavity 804. A user may interact with the control panel 604, which may cause a corresponding mechanical interface in the cavity to interact with a mechanical interface of the optical system 802 to adjust the optical settings.

[0058] Various embodiments described above can be combined to provide further embodiments. All U.S. patents, U.S. patent application publications, U.S. patent applications, foreign patents, foreign patent applications, and non-patent literature mentioned herein and / or listed in the application data sheet are incorporated herein by reference in their entirety. Aspects of the embodiments may be modified, if necessary, to provide further embodiments using the concepts of these various patents, applications, and publications.

[0059] These and other changes may be made to the embodiments in light of the above detailed description. In general, in the following claims, the terms used should not be construed to limit the scope of the claims to the specific embodiments disclosed in the specification and claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Thus, the claims are not limited by this disclosure.

Claims

1. 1. A head mounted display device, comprising: a frame including a cavity; a virtual image display device coupled to the frame and configured to generate virtual image light for a user to perceive visual content; an optical system selectively and removably insertable into the cavity of the frame and positioned along an optical path of the beam of virtual image light when inserted into the cavity; Equipped with The optical system comprises: a first corrective portion having a left optical subsystem and a right optical subsystem; one or more electrical contacts exposed on an outer surface of the optical system; having Each of the left optical subsystem and the right optical subsystem of the first corrective portion comprises: One or more actuators; a first set of lenses disposed at a first location along the optical path and having first optical characteristics that correct a first set of visual conditions; Contains at least one of a first lens and a second lens of the first set of lenses is selectively adjustable by the one or more actuators along a first axis transverse to the optical path relative to the other of the first lens and the second lens of the first set of lenses to modify the first optical characteristic; the one or more electrical contacts are sized and shaped to engage corresponding electrical contacts in the cavity of the frame to establish an electrical connection through which signals and power may be transmitted to the one or more actuators of the optical system; Head-mounted display device.

2. The head mounted display device of claim 1 , wherein the first set of vision conditions includes at least one of myopia or hyperopia.

3. A head-mounted display device as described in claim 1 or 2, wherein the one or more actuators are operably coupled to at least one of the first lens and the second lens of the first set of lenses and configured to selectively adjust the relative position of the first lens relative to the second lens along the first axis.

4. A head mounted display device as described in any one of claims 1 to 3, wherein the first lens is selectively adjustable relative to the second lens along the first axis to modify the first optical characteristic, and the second lens is selectively adjustable relative to the first lens along a second axis that is transverse to the optical path.

5. 5. A head mounted display device as described in any one of claims 1 to 4, wherein each of the left optical subsystem and the right optical subsystem of the first corrective portion further includes a second set of lenses having second optical characteristics disposed at a second position along the optical path that corrects a second set of visual conditions, and at least one of the first lens and the second lens of the second set of lenses is selectively rotatable by the one or more actuators about a second axis transverse to the first axis relative to the other of the first lens and the second lens so as to modify the second optical characteristics.

6. The head mounted display device of claim 5 , wherein the second set of visual conditions includes astigmatism.

7. The one or more actuators a first actuator operatively coupled to at least one of the first lens and the second lens of the first set of lenses and configured to selectively adjust a relative position of the at least one of the first lens and the second lens of the first set of lenses relative to the other of the first lens and the second lens of the first set of lenses along the first axis; a second actuator coupled to the at least one of the first lens and the second lens of the second set of lenses and configured to selectively adjust an angular position of the at least one of the first lens and the second lens of the second set of lenses relative to the other of the first lens and the second lens of the second set of lenses about the second axis; The head mounted display device of claim 5 .

8. a communication interface configured to receive user input; a controller electrically coupled to the first actuator and the second actuator and configured to control the first actuator and the second actuator to adjust the relative position of the at least one of the first lens and the second lens of the first set of lenses and the angular position of the at least one of the first lens and the second lens of the second set of lenses, respectively, based on the user input; The head mounted display device of claim 7 further comprising:

9. The head mounted display device of claim 8 , wherein the user input specifies an optical prescription of the user.

10. 9. The head mounted display device of claim 8, further comprising a memory storing data storing a set of entries each indicating an actuator state of at least one of the first actuator and the second actuator, and the controller is further configured to, in response to receiving the user input, access an entry in the set of entries based on information specified in the user input, and control the first actuator or the second actuator depending on the state indicated in the entry.

11. 6. The head mounted display device of claim 5, wherein the first lens of the second set of lenses is selectively rotatable relative to the second lens of the second set of lenses, and the second lens of the second set of lenses is selectively rotatable relative to the first lens of the second set of lenses.

12. a first user input device disposed external to the frame and operable by a user to selectively adjust a position of the at least one of the first lens and the second lens of the first set of lenses along the first axis; and a second user input device disposed on the exterior of the frame and operable by the user to selectively adjust an angular position of the at least one of the first lens and the second lens of the second set of lenses about the second axis; and The head mounted display device of claim 5 further comprising:

13. A head mounted display device according to claim 1 , wherein the optical system includes a controller operable to send control signals to the one or more actuators.

14. The head mounted display device of claim 1 , wherein the first set of lenses includes one or more Alvarez lenses.

15. 1. An optical system comprising: a frame sized and shaped for selectively and removably mounting into a cavity of a corresponding head mounted display device, the frame including a mounting portion that selectively engages a corresponding portion of the head mounted display device to mount the frame to the head mounted display device; an optical subsystem carried by the frame having a receiving portion that receives virtual image light when incorporated into the head mounted display device, an emitting portion that emits modified virtual image light from the optical system, and a vision correction portion positioned in an optical path of the virtual image light between the receiving portion and the emitting portion, the vision correction portion being configured to modify the virtual image light to correct a visual condition of a user, the vision correction portion having a first correction portion including a left optical subsystem and a right optical subsystem, each of the left optical subsystem and the right optical subsystem comprising: One or more actuators; an optical subsystem including: a first set of lenses disposed at a first location along the optical path and having a first optical characteristic that corrects a first set of visual conditions, wherein at least one of a first lens and a second lens in the first set of lenses is selectively adjustable by the one or more actuators along a first axis transverse to the optical path relative to the other of the first lens and the second lens in the first set of lenses to modify the first optical characteristic; one or more electrical contacts exposed on an outer surface of the frame and sized and shaped to engage corresponding electrical contacts in the cavity of the corresponding head mounted display device to establish an electrical connection through which signals and power may be transmitted to the one or more actuators of the optical subsystem; An optical system comprising:

16. The optical system of claim 15 , wherein the first set of visual conditions includes at least one of myopia or hyperopia.

17. 17. The optical system of claim 15 or 16, further comprising a controller configured to selectively adjust a position of the at least one of the first lens and the second lens of the first set of lenses along the first axis to modify the first optical characteristic.

18. 20. The optical system of claim 17, wherein the controller is configured to selectively adjust the position of the at least one of the first lens and the second lens of the first set of lenses along the first axis in response to receiving a user input.

19. 20. The optical system of claim 18, further comprising an input interface provided on the outside of the frame and configured to engage a corresponding interface of the head-mounted display device to receive an input signal corresponding to a user input, the input interface being electrically coupled to the controller, the controller being configured to selectively adjust the position of at least one of the first lens and the second lens of the first set of lenses based on the received input signal.

20. 20. The optical system of claim 15, wherein each of the left optical subsystem and the right optical subsystem further comprises a second set of lenses disposed at a second position along the optical path and having second optical characteristics correcting a second set of visual conditions, wherein at least one of the first lens and the second lens in the second set of lenses is selectively rotatable about a second axis transverse to the first axis relative to the other of the first lens and the second lens in the second set of lenses to modify the second optical characteristic.

21. 21. The optical system of claim 15, further comprising a first user input device disposed external to the frame operable by a user to selectively adjust a position of the at least one of the first lens and the second lens of the first set of lenses along the first axis.

22. 22. The optical system of claim 15, wherein at least one of the first lens and the second lens is an Alvarez lens.

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