A transparent plate includes: a grating structure layer, including a first surface and a second surface opposite to each other, where a grating structure is disposed on the first surface; and a micro-texture layer, disposed on the second surface, where a surface of the micro-texture layer away from the second surface includes a plurality of micro-texture stripes, and light interferes between the grating structure and the micro-texture layer and forms moire stripes.

Provided is an optical element that can display a clear image having no blurriness in AR glasses or the like. The optical element includes: a substrate; and a laminate that is provided on the substrate and where a plurality of liquid crystal layers obtained by aligning a liquid crystal compound are laminated, in which the liquid crystal layers have a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, and in at least one of the liquid crystal layers, an arithmetic mean value of differences between maximum film thicknesses and minimum film thicknesses obtained by observing 10 cross-sections with a scanning electron microscope is 0.1 μm or less.

A wearable display device (10), including a display panel (101) and a slit grating (102) disposed on a light-emitting side of the display panel (101). Rays emitted by sub-pixels (101111) in the display panel (101) may be exited from slits (102a) in the slit grating (102). In addition, as the rays emitted by the sub-pixels (101111) may be intersected after passing through the slits (102a), the wearable display device (10) may include at least two imaging faces (K, C). In this way, focus points of two eyes of a user are a same point on the at least two imaging faces (K, C) when the two eyes of the user focus on one of the at least two imaging faces (K, C) by a lens focusing function of the two eyes, so as to avoid visual fatigue of the user. Thus, the wearable display device (10) has a better display effect.

A wearable display device (10), including a display panel (101) and a slit grating (102) disposed on a light-emitting side of the display panel (101). Rays emitted by sub-pixels (101111) in the display panel (101) may be exited from slits (102a) in the slit grating (102). In addition, as the rays emitted by the sub-pixels (101111) may be intersected after passing through the slits (102a), the wearable display device (10) may include at least two imaging faces (K, C). In this way, focus points of two eyes of a user are a same point on the at least two imaging faces (K, C) when the two eyes of the user focus on one of the at least two imaging faces (K, C) by a lens focusing function of the two eyes, so as to avoid visual fatigue of the user. Thus, the wearable display device (10) has a better display effect.

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 photonic integrated circuit device can comprise one or more layers having different refraction indices that cause optical coupling issues and losses from layer variations. A film of material can be applied to a layer of the photonic integrated circuit to avoid the issues to increase the optical bandwidth of the photonic integrated circuit device and decrease sensitivity to manufacturing and design processes.

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.

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.

A plasma etching method using a Faraday cage, which effectively produces a blazed grating pattern.

An optical system of a head-mounted display (HMD) system that includes a diffractive optical element coupled to a display, for example, via lamination or a suitable optically clear adhesive. The optical system may include a reflective polarizer and a quarter-wave plate that, together with the diffractive optical element, form a catadioptric or “pancake” configuration that focuses light from a display system to an eye of a user of the head mounted display system.