A head-mounted display (HMD) includes various features that allow for customizing the HMD to different users. The HMD may include an interpupillary distance (IPD) adjustment mechanism that includes a double biasing assembly for smooth, controlled adjustment of the spacing between lens tubes. The HMD may include a field of view (FOV) adjustment mechanism that includes first and second gear assemblies connected via a connecting rod to allow uniform adjustment of the spacing between the lenses and the user's face. The HMD may further include a swappable face gasket, a swappable visor, a removable head strap, and a modular accessory compartment for further customizations to the HMD. The HMD may further include inconspicuous spectrum-transmissive windows that are made with a spectrum-transmissive base material for the HMD housing that is coated with a spectrum-opaque material, and the spectrum-opaque material is selectively removed to create the spectrum-transmissive windows.

According to examples, a system for image generation and delivery in a display device using two-dimensional (2D) field of view (FOV) expander is described. In addition, the system may include a first lens a first lens assembly having a first projector to propagate first display light associated with a first image and a first two-dimensional (2D) expander including a first waveguide for propagating the first display light to a first eye of a user and a second lens assembly having a second projector to propagate second display light associated with a second image and a second two-dimensional (2D) expander having a second waveguide for propagating the second display light to a first eye of a user.

A device includes a waveguide. The device also includes a plurality of grating sets coupled with the waveguide and configured to, during a plurality of time periods, couple a plurality of input image lights into and out of the waveguide as a plurality of output image lights. In a first grating set of the plurality of grating sets, a first vector sum of in-plane projections of grating vectors associated with all gratings included in the first grating set is a first non-null vector. In a second grating set of the plurality of grating sets, a second vector sum of in-plane projections of grating vectors associated with all gratings included in the second grating set is a second non-null vector. The first vector sum and the second vector sum have different directions.

The present disclosure provides techniques to reduce the appearance of an illuminated area on the world-side of lens of a head mounted display (HMD) caused by display light that is outcoupled away from a user. A perimeter region is added to surround a primary region of an outcoupler, where the primary region includes a primary grating structure with one or more grating features to direct display light to the field of view (FOV) area of the user of the HMD. The perimeter region includes a perimeter grating structure with a perimeter grating feature that changes across the width of the perimeter region. In this manner, the perimeter region provides a perimeter grating structure gradient that gradually reduces the intensity of outcoupled display light across the width of the perimeter region, thereby having the effect of “softening” the edges of the outcoupler to reduce its appearance to observers.

A partial electronic see-through HMD includes one or more subassemblies that occlude a central portion of a user's field of view (the peripheral portions of the user's field of view may remain unobstructed). Each subassembly includes an outward facing camera, a display, and an eyepiece. Images of the occluded central zone are captured by the camera and projected to the user via the display and eyepiece. The projected images can also include electronic information, such as AR image overlays. The peripheral zones are not occluded and remain directly viewable by the user. Thus, the projected images complete (or partially complete) the user's FOV of the external environment between the peripheral zones and may provide additional electronic information to the user.

A method for displaying virtual content to a user, the method includes determining an accommodation of the user's eyes. The method also includes delivering, through a first waveguide of a stack of waveguides, light rays having a first wavefront curvature based at least in part on the determined accommodation, wherein the first wavefront curvature corresponds to a focal distance of the determined accommodation. The method further includes delivering, through a second waveguide of the stack of waveguides, light rays having a second wavefront curvature, the second wavefront curvature associated with a predetermined margin of the focal distance of the determined accommodation.

An optical combiner including a waveguide prism configured to convey display light, from a display panel, from a proximal end of the waveguide prism to a distal end of the waveguide prism via total internal reflection. The optical combiner also includes an outcoupling interface positioned at the distal end of the waveguide prism on a surface of the waveguide prism that faces a user's eye. The outcoupling interface includes a plurality of polarization-dependent layers including a refractive beam-splitting convex lens to fold the light path of the display light and reduce the dimensions of a near-eye optical system implementing the optical combiner.

A head-up display device and a transportation device are provided. The head-up display device includes a light source, a scanner configured to scan light emitted from the light source to form scanned light, an angle adjuster configured to change an exit angle of the scanned light, a display unit configured to form an image according to the scanned light from the angle adjuster, and a projection assembly configured to project the image formed on the display component to a selected area.

A system for displaying a stereo image is disclosed. The system includes a stereoscopic head up display (HUD) that includes a combiner and a display configured to display a stereo image. The system further includes either a head tracking sensor or an eye tracking sensor configured to generate a tracking dataset. The system further includes a processor and a memory with instructions that cause the processor to receive the tracking dataset, generate a distortion map based on the tracking dataset and a distortion function, receive a media stereo image, generate a stereo signal based on the distortion map and the media stereo image, and transmit the stereo signal to the display. The system is capable of conveying an image to an operator in the absence of a relay lens.

Provided are an optical element that can make the brightness of light emitted from a light guide plate uniform, a light guide element, and an image display device. The optical element includes a patterned cholesteric liquid crystal layer that is obtained by immobilizing a cholesteric liquid crystalline phase, in which the patterned cholesteric liquid crystal layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, and the patterned cholesteric liquid crystal layer has regions having different pitches of helical structures in a plane.