An imaging lens module includes at least one plastic lens element having an optical axis, an object side and an image side. The plastic lens element includes, in order from a center to a peripheral region thereof, an optical effective portion and an outer peripheral portion. The outer peripheral portion surrounds the optical effective portion, wherein the outer peripheral portion includes, on at least one of the object side and the image side, a plurality of groove structures and a contacting surface. The contacting surface is an annular plane and perpendicular to the optical axis. The groove structures and the contacting surface are located on the same side. There is an air gap between the groove structures and at least one optical element adjacent thereto. The groove structures and the contacting surface located on the same side are not overlapped along a direction parallel to the optical axis.

A device for use with a vehicle-mounted image acquisition unit includes a main body. The main body includes a first end and a second end opposite to the first end. The main body further defines an interior cavity extending between the first end and the second end, and a plurality of apertures therethrough between the first end and the second end. The first end of the main body is configured to be disposed at or near the vehicle-mounted image acquisition unit. The vehicle-mounted image acquisition unit has a field of view extending through the interior cavity and through the second end to an outside environment surrounding a vehicle.

An active metasurface includes a number of periodically-repeated unit cells arranged on a substrate, each of the unit cells including a high-index dielectric block; a heat source positioned to selectively modulate heat applied to the high-index dielectric block; and an insulating undercut region at an interface between the high-index dielectric block and the substrate.

A fractional handpiece and systems thereof for skin treatment include a passively Q-switched laser assembly operatively connected to a pump laser source to receive a pump laser beam having a first wavelength and a beam splitting assembly operable to split a solid beam emitted by the passively Q-switched laser assembly and form an array of micro-beams across a segment of skin. The passively Q-switched laser assembly generates a high power sub-nanosecond pulsed laser beam having a second wavelength.

The present invention relates to a new method for making metasurfaces comprising liquid gating.

A display substrate, a method for forming a display substrate, and a display device are provided. The display substrate includes: a plurality of pixels arranged in an array on a base substrate; a light-shielding pattern at a side, away from the base substrate, of the pixels, and an orthographic projection of the light-shielding pattern on the base substrate is overlapped with an orthographic projection of a gap between adjacent pixels on the base substrate; a light extraction structure arranged at a light-emitting side of the pixel and a side of the light-shielding pattern adjacent to the base substrate, a light-emitting direction of the light extraction structure is a direction of the light extraction structure away from the pixels, and an orthographic projection of the light extraction structure on the base substrate is overlapped with an orthographic projection of the pixels on the base substrate.

A head-mounted display (HMD) having a line-of-sight detection function includes angle selection type transmission elements that are disposed in a finder optical path for eyes of a user, respectively, a light projecting unit and a light receiving unit for line-of-sight detection, and is configured to be capable of adjusting a direction of a finder to a detected line-of-sight direction. The angle selection type transmission elements have first to third opening portions with different directions. The first and second opening portions limit a passage direction of light in first and second regions in a finder optical path, respectively. The third opening portion is formed around a line connecting an eye point and the light receiving unit.

Provided is a display apparatus including a circuit substrate, a light-emitting layer, a polarizing layer, a quarter waveplate, and a bandpass polarizing reflective layer. The light-emitting layer includes a plurality of first light-emitting structures. The first light-emitting structures have a first peak emission wavelength. The polarizing layer is located on a side of the light-emitting layer away from the circuit substrate. The quarter waveplate is disposed between the polarizing layer and the light-emitting layer and overlaps the light-emitting layer and the polarizing layer. The bandpass polarizing reflective layer is disposed between the quarter waveplate and the light-emitting layer and includes a first bandpass polarizing reflective pattern overlapping the first light-emitting structures. A reflectance of the bandpass polarizing reflective pattern for light with a wavelength in a first wavelength range is greater than 20%. The first wavelength range is the peak emission wavelength ±10 nm.

SMA actuators and related methods are described. One embodiment of an actuator includes a base; a plurality of buckle arms; and at least a first shape memory alloy wire coupled with a pair of buckle arms of the plurality of buckle arms. Another embodiment of an actuator includes a base and at least one bimorph actuator including a shape memory alloy material. The bimorph actuator attached to the base.

An example article may include an optical filter and a multilayer stack adjacent the optical filter. The multilayer stack may include a plurality of layers. Each respective layer of the plurality layers may define a respective window edge of a plurality of window edges. The plurality of window edges may define an optical window configured to transmit light through the optical filter. At least a first respective window edge of the plurality of window edges may be stepped relative to at least a second respective window edge of the plurality of window edges.