Abstract: Provided is a method and device for tracking eyeballs, a display device, a device, and a medium. The device for tracking eyeballs includes a distance detecting unit, a light emitting unit, a light detecting unit, and a processing unit; wherein the distance detecting unit is configured to detect a first distance between an eyeball to a target object; the light emitting unit is configured to irradiate a target eyebox region of the target object with infrared light; the light detecting unit includes a plurality of sub-units arranged in an array, wherein each of the plurality of sub-units includes a plurality of receivers; and the processing unit is configured to control a first receiver in each of the plurality of sub-units to receive the infrared light reflected by the eyeball and determine a position of the eyeball based on an intensity of the infrared light received by the first receiver.

Abstract: A near-eye display device, including: a display device (1) for displaying an image; an imaging lens (2) on a light-outgoing side of the display device (1) and for imaging the image displayed on the display device (1); a polarizer (3) on the light-outgoing side and for converting light emitted from the display device (1) into linearly polarized light; first and second phase delay layers (41, 42), on a side of the polarizer (3) distal to the display device (1) and for converting a polarization state of incident light; a polarized light splitter (5) on a side of the second phase delay layer (42) distal to the polarizer (3); and a curved mirror (6) on a reflected light path of the polarized light splitter (5) and for partially reflecting light transmitted by the second phase delay layer (42) to human eyes and partially transmitting ambient light.

Abstract: An eyepiece system is applied to a near-eye display device and includes: a plurality of lenses sequentially disposed along an optical axis from an image-side to an object-side, wherein a refractive index of each of the plurality of lenses is greater than 1.65, and a total system length of the plurality of lenses along the optical axis is less than or equal to 25 mm.

Abstract: Provided is a near-eye display apparatus, comprising: a first display (11), used for displaying a first image, entering a beam splitter (30) by means of a first imaging lens (12); a second display (21), used for displaying a second image, entering the beam splitter (30) by means of a second imaging lens (22), the beam splitter (30) being used for transmitting the imaging light beam of the first imaging lens (12) and reflecting the imaging light beam of the second imaging lens (22); a waveguide plate (40), located on the light exit path of the beam splitter (30), and used for receiving outgoing light from the beam splitter (30) and transmitting same; the waveguide plate (40) is internally provided with a light-taking component (400), the light-taking component (400) being used for reflecting the imaging light beam transmitted in the waveguide plate (40) toward a position where a human eye is located.

Abstract: An optical displaying system includes a display screen; a first light splitting unit, wherein a light ray emitted by the display screen is converted into a first-type polarized light or a second-type polarized light after passing through the first light splitting unit; an imaging unit, wherein a light ray exiting from the first light splitting unit forms an enlarged image corresponding to a first focal length after passing through the imaging unit; a second light splitting unit; a first optical-path unit, wherein the first-type polarized light transmitted from the second light splitting unit forms an enlarged image corresponding to a second focal length, and is converted into the second-type polarized light, after passing through the first optical-path unit; and a second optical-path unit, wherein the second-type polarized light reflected from the second light splitting unit is converted into the first-type polarized light after passing through the second optical-path unit.

Abstract: An optical system has an optical axis, and includes a positive focal power lens, a negative focal power lens and a display. The positive focal power lens includes a first convex surface away from the display and a second convex surface proximate to the display. The negative focal power lens includes a third convex surface away from the display and a fourth concave surface proximate to the display. For a refractive index of the positive focal power lens and a refractive index of the negative focal power lens, one is greater than another, and a greater refractive index is a first refractive index, a smaller refractive index is a second refractive index, the first refractive index is greater than 1.7, the second refractive index is greater than 1.5, and a ratio of the first refractive index to the second refractive index is less than or equal to 2.

Abstract: A near-eye display device, including: a display screen (1) used for image display; an imaging lens (2) located at a light emission side of the display screen (1) and used for imaging a displayed image of the display screen (1); a flat plate (3) located on the side of the imaging lens (2) facing away from the display screen (1) and obliquely arranged relative to the optical axis of the imaging lens (2); a phase retardation layer (4) located on the side of the flat plate (3) facing the imaging lens (2); a polarization beam-splitting layer (5) located between the phase retardation layer (4) and the flat plate (3); a polarizing layer (6) located between the polarization splitting layer (5) and the flat plate (3); and a curved mirror (7).

Abstract: A head-up display system and a display apparatus are provided in this disclosure, which relates to a technical field of displaying. The head-up display system includes a display unit; a light splitting unit provided on a light emitting side of the display unit and configured to transmit a first linearly polarized light and block a second linearly polarized light, light emitted by the display unit being converted into the first linearly polarized light after passing through the light splitting unit; a light-transmitting substrate; a first imaging unit provided on an optical path from the light splitting unit to the light-transmitting substrate and configured to be able to transmit and reflect the first linearly polarized light; and a second imaging unit provided on a side of the light-transmitting substrate away from the first imaging unit, and configured to reflect the first linearly polarized light transmitted through the light-transmitting substrate.

Abstract: A head up display system, including: a display screen used for displaying an image; an imaging lens arranged on a light exit side of the display screen and used for imaging an image displayed on the display screen; and a curved reflecting mirror arranged on the side of the imaging lens facing away from the display screen and used for receiving imaging light of the imaging lens and reflecting said light to the position where human eyes are located. Relative positions of the display screen and the imaging lens are fixed, and the imaging lens and the curved reflecting mirror adopt a separate structure.

Abstract: A near-eye display apparatus, a display method thereof and a wearable device. The near-eye display apparatus comprises: at least one first display unit (31), the first display unit (31) being configured to form at an imaging position a first image; at least one second display unit (32), the second display unit (32) being configured to form at the imaging position a second image, the first image and the second image being spliced to form a display image; and an optical path adjustment structure (5), the optical path adjustment structure (5) being configured to transmit towards the direction of the imaging position at least part of emergent light rays of the first display unit (31), and to reflect towards the direction of the imaging position at least part of emergent light rays of the second display unit (32).

Abstract: Disclosed is a near eye display apparatus, comprising a display screen and an imaging system. The imaging system comprises a biconvex lens, a transflective plane mirror and a transflective curved mirror. The biconvex lens is configured to magnify a display image of the display screen; the transflective plane mirror is configured to receive imaging light from the biconvex lens and reflect same to the transflective curved mirror; and the transflective curved mirror is configured to converge the imaging light and reflect same to the position(s) where human eyes are located.

Abstract: An optical display system, a control method, and a display device, relates to the field of display technology. The optical display system comprises a display screen a first light splitting unit disposed at a display side of the display screen; a first imaging unit comprising a light splitting film disposed at a light-incident surface of the first imaging unit; a second light splitting unit disposed at a light emission side of the first imaging unit; a phase modulation unit disposed at least in a light path from the first imaging unit to the second light splitting unit; wherein, the first-type polarized light transmitted from the first light splitting unit is transmitted from a light emission side of the second light splitting unit, after being turned back multiple times between the first imaging unit and the second light splitting unit.

Abstract: Provided are an optical waveguide structure, an Augmented Reality (AR) device, and a method for obtaining an emergent light efficiency of an optical waveguide structure, which relates to the technical field of display. The optical waveguide structure includes: an optical waveguide body, a coupling-in grating disposed at the optical waveguide body, and a plurality of coupling-out gratings distributed and arranged. The coupling-in grating is configured to couple image light into the optical waveguide body. The optical waveguide body is configured to generate a total internal reflection of the image light to the coupling-out gratings. Diffraction efficiencies of each of the coupling-out gratings are different, and each of the coupling-out gratings is configured to couple the image light out of the optical waveguide body at the same brightness.

Abstract: An optical system, a display apparatus, and smart glasses are provided. The optical system includes a transflective element, a reflective element and a plurality of microstructures. The transflective element is configured to reflect collimated incident light to the reflective element. The reflective element is configured to reflect the collimated incident light back to a light incident surface of the transflective element, so as to adjust an angle at which the collimated incident light exits. The transflective element is further configured to transmit the reflected-back collimated incident light to a target region. The plurality of microstructures are configured to adjust angles at which ambient stray light incident on surfaces thereof exits, and to scatter the ambient stray light out of the target region.

Abstract: Provided are a projection assembly, a display system and a vehicle. The projection assembly is applied to the vehicle, and the projection assembly includes: a housing, a bottom cover, a display module, a heat dissipation assembly and an imaging lens. The housing is connected with the bottom cover, and the housing and the bottom cover form an accommodating space, the heat dissipation assembly, the display module and the imaging lens are all disposed in the accommodating space, and the display module is disposed on the heat dissipation assembly; and the imaging lens includes a lens barrel and a lens assembly, the lens barrel is disposed on the heat dissipation assembly, the lens assembly is disposed in the lens barrel, and the lens barrel surrounds the display module, the display module faces the lens assembly, the housing is provided with an opening, and the lens assembly faces the opening.

Abstract: An AR optical system includes a depth-of-field separation structure corresponding to an image source, configured to convert light rays emitted from the image source into a plurality of light beams with different depths of field; a convergent lens located on an emergent light path of the depth-of-field separation structure, and configured to receive and shape the plurality of light beams with different depths of field; a first semi-transmitting semi-reflecting mirror located on a side, away from the depth-of-field separation structure, of the convergent lens, and configured to reflect the plurality of shaped light beams with different depths of field towards a set direction; a concave mirror having a preset transmission-reflection ratio configured to reflect and converge the plurality of light beams with different depths of field and then make the light beam incident to a set observation position after passing through the first semi-transmitting semi-reflecting mirror.

Abstract: A near-eye display apparatus is disclosed. The near-eye display apparatus includes a lens and an optical path folding assembly. The lens is configured to receive incident light of a first image, which is projected by a micro-display, and shape the first image; the lens includes a primary optical axis and a first lens face and a second lens face which are opposed in a first direction where the primary optical axis of the lens is positioned, a curvature radius of the first lens face is within a range of 70 to 100 millimeters, and a curvature radius of the second lens face is within a range of 10 to 30 millimeters; and the optical path folding assembly is configured to receive light of the first image shaped by the lens and fold an optical path from the lens to an exit pupil of the near-eye display apparatus.

Abstract: An optical system, includes a first lens, a second lens and a third lens that are sequentially arranged from an image side to an object side, and principal optical axes of the first lens, the second lens and the third lens being collinear. The first lens is a convex lens, and at least one of the second lens and the third lens is a meniscus lens.

Abstract: An optical system has an optical axis, and includes a positive focal power lens, a negative focal power lens and a display. The positive focal power lens includes a first convex surface away from the display and a second convex surface proximate to the display. The negative focal power lens includes a third convex surface away from the display and a fourth concave surface proximate to the display. For a refractive index of the positive focal power lens and a refractive index of the negative focal power lens, one is greater than another, and a greater refractive index is a first refractive index, a smaller refractive index is a second refractive index, the first refractive index is greater than 1.7, the second refractive index is greater than 1.5, and a ratio of the first refractive index to the second refractive index is less than or equal to 2.

Abstract: Provided are an optical waveguide structure, an Augmented Reality (AR) device, and a method for obtaining an emergent light efficiency of an optical waveguide structure, which relates to the technical field of display. The optical waveguide structure includes: an optical waveguide body, a coupling-in grating disposed at the optical waveguide body, and a plurality of coupling-out gratings distributed and arranged. The coupling-in grating is configured to couple image light into the optical waveguide body. The optical waveguide body is configured to generate a total internal reflection of the image light to the coupling-out gratings. Diffraction efficiencies of each of the coupling-out gratings are different, and each of the coupling-out gratings is configured to couple the image light out of the optical waveguide body at the same brightness.