A light source device includes a plurality of light emitting parts, a first lens, and an optical lens. Each light emitting part is configured to emit light from the light emitting surface at a first full-width half-maximum and is configured to be individually turned on. The optical lens has a first surface including incident regions and a second surface including emission regions. A minimum distance between the first surface of the optical lens and the first lens is 0.1 mm or more and 1.0 mm or less. A light emitted from each of the light emitting parts enters the optical lens through the first lens, the light being emitted from the first lens at a second full-width half-maximum smaller than the first full-width half-maximum, such that lights emitted from two or more of the light emitting parts are irradiated to two or more corresponding irradiation regions.

A light source device includes a plurality of light emitting parts, a first lens, and an optical lens. Each light emitting part is configured to emit light from the light emitting surface at a first full-width half-maximum and is configured to be individually turned on. The optical lens has a first surface including incident regions and a second surface including emission regions. A minimum distance between the first surface of the optical lens and the first lens is 0.1 mm or more and 1.0 mm or less. A light emitted from each of the light emitting parts enters the optical lens through the first lens, the light being emitted from the first lens at a second full-width half-maximum smaller than the first full-width half-maximum, such that lights emitted from two or more of the light emitting parts are irradiated to two or more corresponding irradiation regions.

Present embodiments may provide for a mobile device and an optical imaging lens thereof. The optical imaging lens may comprise an aperture stop and five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics and the total length of the optical imaging lens may be shortened.

An optical imaging lens includes a first lens element having negative refracting power, a second lens element having negative refracting power and a periphery region of the image-side surface of the second lens element is concave, an optical axis region of the image-side surface of the fifth lens element is concave, an optical axis region of the image-side surface of the sixth lens element is concave. Lens elements included by the optical imaging lens are only six lens elements. υ1 is an Abbe number of the first lens element, υ3 is an Abbe number of the third lens element, EFL is an effective focal length, ImgH is an image height and Fno is a f-number to satisfy EFL*Fno/ImgH≤3.200 and υ1+υ3≤90.000.

A metalens and an optical system having the metalens. The metalens includes: a substrate capable of transmitting light in different wavelength bands; and a plurality of unit cells on the same surface of the substrate. The multiple unit cells are arranged in an array, the unit cells are regular hexagons and/or squares. A center position of each unit cell or each of the center position and vertex positions of each unit cell is provided with a nanostructure. The nanostructures are symmetrically arranged with respect to a first axis and a second axis respectively, and partial nanostructures obtained by dividing the nanostructures on the metalens along the first axis and the second axis are identical to each other. The first axis is perpendicular to the second axis, and both the first axis and the second axis are perpendicular to a height direction of the nanostructures.

A metalens and an optical system having the metalens. The metalens includes: a substrate capable of transmitting light in different wavelength bands; and a plurality of unit cells on the same surface of the substrate. The multiple unit cells are arranged in an array, the unit cells are regular hexagons and/or squares. A center position of each unit cell or each of the center position and vertex positions of each unit cell is provided with a nanostructure. The nanostructures are symmetrically arranged with respect to a first axis and a second axis respectively, and partial nanostructures obtained by dividing the nanostructures on the metalens along the first axis and the second axis are identical to each other. The first axis is perpendicular to the second axis, and both the first axis and the second axis are perpendicular to a height direction of the nanostructures.

An illumination module includes a light emitting unit, an optical lens with positive refractive power, and a concave mirror. At least one of an object-side surface and an image-side surface of the optical lens is a free-form surface, and the light emitting unit is provided at an object side of the optical lens. The concave mirror is provided at an image side of the optical lens, and the concave mirror acts as an optical path folding element. Light emitted by the light emitting unit passes through the optical lens and is reflected by the concave mirror to be a parallel light ray.

A head mounted display includes: a display configured to display an image; a shutter configured to block light incident on an eye; a controller configured to control the display to display a left eye image and a right eye image using half or more of a region of the display in a horizontal direction and to control the shutter based on the image displayed on the display; and a lens configured to focus light output from the display such that the left eye image and the right eye image displayed on the display are viewed by a left eye and a right eye respectively.

A metalens, a metalens set, and a method of image construction or decryption are disclosed. The metalens includes metastructures each having a shape and a height related to a resonant light wavelength of the metastructure, so that the metalens can present an incident light of the resonant light wavelength as a light shape or light pattern at a far-field position matching the resonant light wavelength. A metalens set formed by staking the metalenses vertically can present incident lights having different resonant wavelengths as light shapes, light patterns, or resolved images at far-field positions matching the resonant wavelengths. Image construction or decryption are achieved by combining resolved images of the resonant light wavelengths with non-resolved images of non-resonant light wavelengths so as to compose an overlay image, which is to be decomposed by the metalens or the metalens set so as to recover the resolved images.

A metalens, a metalens set, and a method of image construction or decryption are disclosed. The metalens includes metastructures each having a shape and a height related to a resonant light wavelength of the metastructure, so that the metalens can present an incident light of the resonant light wavelength as a light shape or light pattern at a far-field position matching the resonant light wavelength. A metalens set formed by staking the metalenses vertically can present incident lights having different resonant wavelengths as light shapes, light patterns, or resolved images at far-field positions matching the resonant wavelengths. Image construction or decryption are achieved by combining resolved images of the resonant light wavelengths with non-resolved images of non-resonant light wavelengths so as to compose an overlay image, which is to be decomposed by the metalens or the metalens set so as to recover the resolved images.