Abstract: A lens driving apparatus includes a holder, a cover, a carrier, a first magnet, a coil, a spring, two second magnets and a hall sensor. The holder includes an opening hole. The cover is made of metal material and coupled to the holder. The carrier is movably disposed in the cover, and for coupling to a lens. The first magnet is connected to an inner side of the cover. The coil is wound around an outer side of the carrier, and adjacent to the first magnet. The spring is coupled to the carrier. The second magnets are disposed on one end of the carrier which is toward the holder. The hall sensor is for detecting a magnetic field of any one of the second magnets, wherein the magnetic field is varied according to a relative displacement between the hall sensor and the second magnet which is detected.

Abstract: The present invention provides an image focusing method that is applied to an image capture device having an optical image stabilization (OIS) function, including: driving the at least one optical lens to tilt by an angle in response to a first selected target and a second selected target, and enabling a first light beam group from the first selected target and a second light beam group from the second selected target to be focused on a same imaging surface after passing through the at least one optical lens. In addition, the present invention further provides an image capture device and an electronic device that apply the foregoing method.

Abstract: An analog-digital converter (ADC) module includes: an ADC configured to convert an analog signal into digital data according to a control signal; and an ADC controller configured to receive a mode selection signal setting the ADC controller in one of a plurality of modes, output the control signal to the ADC, and receive the digital data from the ADC. The ADC controller repeatedly outputs the control signal to the ADC using a timer, and stores the digital data in a register in response to an end of conversion (EOC) signal from the ADC, in a first mode. The ADC controller outputs the control signal to the ADC in response to an instruction signal, stores the digital data in the register in response to the EOC signal being input from the ADC, and outputs an interrupt signal to the ADC in response to the digital data being stored in the register, in a second mode.

Abstract: The subject of this invention is a laterally unconstrained magnetic joint and application of said joint in tip-tilt and piston-tip-tilt optical mounts. The laterally unconstrained magnetic joint in its basic embodiment comprises two interfacing parts: one having a flat surface interfacing a convex surface of the other, wherein one or both parts are made from permanent magnets that are magnetized along the axis of the joint, and the other of the said parts is made from a ferromagnetic material thus creating magnetic force attraction between the two parts. The resulting lack of lateral mechanical constraint between the two parts of the joint is utilized in tip-tilt mounts by decoupling an adjustor and/or actuator from the payload resulting in a simple, uniform design, while magnetic force provides retention sufficient for a wide variety of applications.

Abstract: A zoom lens includes a first lens group, a second lens group, a third lens group, a fourth lens group and an aperture. The first lens group, the second lens group, the third lens group and the fourth lens group are sequentially arranged in a direction. The aperture is located between the second lens group and the third lens group. When the zoom lens performs a zoom operation, the first lens group and the third lens group are fixed and the second lens group and the fourth lens group are moved, and a moving distance of the fourth lens group on an optical axis of the zoom lens is less than 5 mm.

Abstract: There is provided an imaging lens having small ratio of the total track length to the focal length of an overall optical system, reducing telephoto ratio, properly correcting aberrations and having the high resolution. An imaging lens comprises five optical elements, in order from an object side to an image side, comprising, a first lens as a first optical element having positive refractive power, a second lens as a second optical element having negative refractive power and a convex surface facing the object side near an optical axis, a third lens as a third optical element having the refractive power, and a fourth lens as a fourth optical element having refractive power and the convex surface facing the object surface near the optical axis, wherein and an aberration correction optical element as a fifth optical element are arranged between said third lens and said fourth lens, said aberration correction optical element has both flat surfaces near the optical axis and aspheric surfaces.

Abstract: There is provided an imaging lens with high-resolution which realizes the wide field of view, low-profileness, and low F-value in well balance, and proper correction of aberrations. An imaging lens comprising in order from an object side to an image side, a first lens having a convex surface facing the object side near an optical axis and negative refractive power, a second lens having negative refractive power, a third lens, a fourth lens having biconvex shape near the optical axis, and a fifth lens, wherein each lens of the first lens to the fifth lens is arranged without being cemented, and a below conditional expression (1) is satisfied: 0.50<r5/r6<12.50??(1) where r5: curvature radius of the object-side surface of the third lens, and r6: curvature radius of the image-side surface of the third lens.

Abstract: Provided are an optical lens assembly and an electronic apparatus having the same. The optical lens assembly having a plurality of lenses arranged from an object side toward an image side where an image sensor is disposed, includes a bending unit configured to reflect light input from the object side in a first direction toward a second direction; and a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power, which are arranged in the second direction in order from the bending unit toward the image side. The first lens group includes a first lens having negative refractive power and disposed adjacent to the bending unit and a second lens having positive refractive power.

Abstract: In a cemented lens 4 used for a lens unit, a first lens 6 is a plastic lens including a concave lens surface 620 facing a side of a second lens 7. The second lens 7 is a plastic lens including a convex lens surface 710 bonded by an adhesive layer 5 on the concave lens surface 620, and a second flange part 75 surrounding, at an outer peripheral side, the convex lens surface 710. When T0 denotes a center thickness in an optical axis L direction of the second lens 7 and C denotes a thickness in the optical axis L direction of the second flange part 75, the thicknesses T0 and C satisfy the following relationship of: 2.0?T0/C?3.2.

Abstract: There is provided an imaging lens with high-resolution which realizes reducing size, the low-profileness, low F-number and small telephoto ratio. An imaging lens comprising in order from an object side to an image side, a first lens having positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens having the positive refractive power, and a sixth lens, wherein a below conditional expression is satisfied: 0.6<TTL/f<1.0 where TTL: total track length, and f: focal length of the overall optical system.

Abstract: The tri-axis close-loop feedback controlling module for electromagnetic lens driving device includes a 6-pin Hall element. Two pins of the Hall element are coupled to an auto-focus module for providing a current to drive the auto-focus module to conduct auto-focusing operations along the Z-axis; while other four pins of the Hall element are coupled to a control unit. The control unit detects the X-Y axial positions of the auto-focus module relative to an OIS module and generates a control signal which is then sent to the Hall element. Therefore, the Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can drive the auto-focus module based on the control signal corresponding to the X-Y axial positions of the auto-focus module, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.

Abstract: An optical photographing lens assembly includes six lens elements, in order from an object side to an image side, the six lens elements are a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has positive refractive power. The fourth lens element has negative refractive power. The fifth lens element has an object-side surface being concave in a paraxial region thereof. The sixth lens element has an image-side surface being convex in a paraxial region thereof, both an object-side surface and the image-side surface of the seventh lens element are aspheric, and at least one of the object-side surface and the image-side surface of the sixth lens element includes at least one inflection point.

Abstract: A compact high-resolution imaging lens which provides a wide field of view of 80 degrees or more and corrects various aberrations properly. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in the following order from an object side to an image side: a first positive (refractive power) lens having a convex object-side surface; a second negative lens having a concave image-side surface; a third positive lens as a double-sided aspheric lens having a convex object-side surface; a fourth positive lens having a convex image-side surface; a fifth lens as a double-sided aspheric lens having a concave image-side surface; and a sixth negative lens having a concave image-side surface. The image-side surface of the sixth lens has an aspheric shape with a pole-change point in a position off an optical axis.

Abstract: A compact high-resolution imaging lens which provides a wide field of view of 80 degrees or more and corrects various aberrations properly. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in the following order from an object side to an image side: a first positive (refractive power) lens having a convex object-side surface; a second negative lens having a concave image-side surface; a third positive lens as a double-sided aspheric lens having a convex object-side surface; a fourth positive lens having a convex image-side surface; a fifth lens as a double-sided aspheric lens having a concave image-side surface; and a sixth negative lens having a concave image-side surface. The image-side surface of the sixth lens has an aspheric shape with a pole-change point in a position off an optical axis.

Abstract: The rear converter lens consists of, in order from an object side: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; and a third lens group that has a positive refractive power. The first lens group consists of a cemented lens in which a negative lens concave toward the image side and a positive lens convex toward the object side are cemented. The second lens group consists of a cemented lens in which a negative lens concave toward the image side, a positive lens convex toward both sides, and a negative lens concave toward the object side are cemented. The third lens group consists of a cemented lens in which a positive lens convex toward the object side and a negative lens are cemented. The rear converter lens satisfies predetermined Conditional Expressions (1) and (2).

Abstract: A lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a stop, a fourth lens, a fifth lens and a sixth lens. The first lens is a meniscus with refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with negative refractive power and includes a concave surface facing the object side. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is with positive refractive power and includes a convex surface facing the image side. The fifth lens is a biconcave lens with negative refractive power. The sixth lens is with positive refractive power and includes a convex surface facing the object side.

Abstract: An objective optical system for endoscope consists of in order from an object side, a first lens having a negative refractive power, a second meniscus lens having a positive refractive power and having a convex surface directed toward an image side, an aperture stop, a third lens having a positive refractive power, and a cemented lens of a fourth lens having a positive refractive power and a fifth lens having a negative refractive power, and the objective optical system for endoscope satisfies the following conditional expressions (1-1), (1-2), and (1-3). ?0.6?f1/f45??0.18??(1-1) 0.2?(r3f+r3r)/(r3f?r3r)?1??(1-2) 0.15?d34/d4?0.

Abstract: A wide angle lens assembly (1) for a camera. The assembly comprises a first group (2) and a second group (3) of lenses. The first group (2) is adapted to be arranged closer to an iris of the camera than the second (3) group. The first group (2) comprises multiple, preferably five, lenses with a negative refractivity and the second group (3) comprises at least three, preferably cemented, lenses (5) and at least one aspherical lens (6). The first group (2) comprises one aspherical lens (7) spaced furthest from the other lenses of the first group (2) and adapted to be arranged further away from the iris than the other lenses of the first group (2).

Abstract: An image capture system including two imaging systems of the same structure each having a wide-angle lens, which includes a front group, a reflection surface, and a rear group arranged in order from an object side, has a field angle larger than 180 degrees, and bends an optical axis of the front group toward the rear group by the reflection surface, and an imaging sensor, obtains an image in a solid angle of 4? radian by combining images imaged by the imaging systems. Each of the two wide-angle lenses includes the reflection surface between the front group and the rear group, the reflection surfaces are made to be common to the two imaging systems. This reduces an interval between lenses nearest to the object side in the front groups of the two wide-angle lenses, thereby reducing a distance between maximum field angles of the two wide-angle lenses.

Abstract: The imaging lens consists of, in order from the object side, a first lens group, an aperture stop, a second lens group having a positive refractive power. During focusing from a distant object to a close-range object, the first lens group remains stationary, and the aperture stop and the second lens group integrally move to the object side. The imaging lens satisfies predetermined conditional expressions relating to a focal length of the whole system, a focal length of the first lens group, a principal point position of the second lens group, a focal length of the second lens group, a back focal length, and the like.

Abstract: The imaging lens consists of, in order from the object side, a positive first lens group that has a positive refractive power and remains stationary during focusing, and a second lens group that moves toward an image side during focusing from a distant object to a close-range object. The first lens group has, successively in order from a position closest to the image side, a first-b sub-lens group having a positive refractive power, and an aperture stop. The imaging lens satisfies predetermined conditional expressions relating to the first-b sub-lens group, the second lens group, and the like.

Abstract: The present disclosure provides a fluorescent projection display device capable of performing both the generation of photovoltaic electricity and the display of visual images, and a display system employing the fluorescent projection display device. The fluorescent projection display device capable of photovoltaic generation according to the present disclosure includes: a transparent film including luminescent materials configured to reflect incident sunlight internally to concentrate the incident sunlight, and to be excitated by input light in an excitation wavelength range to radiate a display light corresponding to the light in the excitation wavelength range; and a solar cell disposed on at least one edge of the transparent film to convert concentrated sunlight propagated from the transparent film into electricity.

Abstract: Apparatus and method are disclosed for co-aligning laterally displaced radiation beams from respective radiation source outputs, each beam comprising a number of spectral components. The apparatus comprises a collimating element for receiving each of said radiation beams with respective lateral displacements and a combining element for receiving each of said radiation beams passed by said collimating element for co-aligning the radiation beams. The apparatus further comprises a diffraction assembly disposed in an optical path between the output of at least one radiation source and the collimating element, for spatially separating the radiation beam output by said at least one radiation source into the constituent spectral components of radiation prior to passing the radiation to the collimating element.

Abstract: In one embodiment, a selective plane illumination microscopy system for capturing light emitted by an illuminated specimen, the system including a specimen support having a top surface configured to support a specimen holder and an opening configured to provide access to a bottom of the specimen holder, and a selective plane illumination microscopy optical system positioned beneath the specimen support, the optical system configured to illuminate the specimen with a sheet of excitation light and including an excitation objective, a detection objective, and an open-top, hollow imaging element that is configured to contain a liquid, wherein the imaging element is positioned within the opening of the specimen support and optical axes of the objectives are aligned with the imaging element such that the axes pass through the imaging element and intersect at a position near the top surface of the specimen support.

Abstract: A dynamic focus and zoom system with three MEMS mirrors, three prisms, three beam splitters, three fixed lenses and an optical relay, all within a housing. The second prism, first and second fixed lenses, and first beam splitter are aligned linearly along a longitudinal axis of the optical relay. The first and second MEMS mirrors are linearly aligned with one another at a ninety-degree angle to such longitudinal axis. The third MEMS mirror, third fixed lens, third wave plate, third beam splitter and third prism are linearly aligned with one another at a ninety-degree angle to the same longitudinal axis. The third prism abuts up against the center of the optical relay between the first and second fixed lenses and is linearly aligned with the first prism such that the linear alignment of the first and third prisms is parallel to the longitudinal axis of the optical relay.

Abstract: A method for examining a sample by light sheet microscopy includes illuminating a sample surface located in an illumination plane by a light sheet propagating in the illumination plane. A position of a light sheet focal point of the light sheet in the illumination plane is moved by changing an optical length of a light path of illumination light forming the light sheet. Detection light emanating from the illumination plane is detected.

Abstract: An oblique viewing endoscope has an aperture through which some rays out of rays reflected from an object in an oblique viewing direction pass, an imaging element that captures an image, based on image forming of the rays passing through the aperture, and a lens that is disposed between the aperture and the imaging element, and that has a lens surface on which the image is formed by causing some rays in at least a visual field center out of the rays passing through the aperture in the oblique viewing direction to be substantially vertically incident on a center of the imaging element.

Abstract: The objective optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. Focusing is carried out by moving the second lens group. The third lens group includes a positive lens and a cemented lens, and the cemented lens includes a positive lens and a negative lens. A first sub-unit includes a lens positioned on the object side of a predetermined air space and a second sub-lens group includes a lens positioned on an image side of the predetermined air space. The predetermined air space is the maximum air space among the air spaces in the third lens group, and the following conditional expressions (1) and (2) are satisfied: 1.21<fp/f<2.42??(1), and 0.35<tt/f<0.6??(2).

Abstract: The present disclosure relates to a display panel, a device and a method for controlling the same. The display panel includes: a substrate; a detecting light transmitter, a detecting light receiver, a first optical element and a second optical element which are disposed on the substrate. The first optical element is configured to diverge light emitted from the detecting light transmitter and the second optical element is configured to converge the reflected divergent light to the detecting light receiver.

Abstract: Embodiments of the present disclosure provide a MEMS light valve, a pixel array and a display apparatus. The MEMS light valve includes a first grating including first openings arranged in a matrix; a second grating, parallel to the first grating and including light emitting areas corresponding to the first openings, wherein the second grating is capable of moving with respect to the first grating along a shifting direction parallel to the first grating. Light emitting materials which emit lights having certain wavelengths by means of excitation by external lights are provided on the light emitting areas.

Abstract: The head-up display device projects a virtual image and includes: an image processor that processes an image to be displayed as a virtual image; an image display that projects the processed image; and a display controller that controls the displaying of the image display. The image display includes: a projector that projects an image; a diffusion plate that forms the image projected by the projector; and a lens that guides the image formed by the diffusion plate. The diffusion plate is constituted by a plurality of functional liquid crystal films that are located at different distances from the lens. The display controller is configured such that, by controlling a transmissive state and a white state of each functional liquid crystal film, the position and distance for displaying the virtual image can be changed.

Abstract: A head-up display device projects a virtual image. The head-up display device includes a display, a first optical member, a second optical member, and an adjuster. The display outputs light that becomes a display image corresponding to the virtual image. The first optical member reflects the light incident from the display. The second optical member reflects or transmits the light reflected by the first optical member such that the virtual image is projected. The adjuster moves the first optical member to adjust a projection distance of the virtual image. The adjuster changes a distance between the first optical member and the second optical member and an inclination angle of the first optical member with respect to the display according to the projection distance of the virtual image.

Abstract: A drive device includes a drive part and a movable member structured to be moved by a drive force of the drive part. The movable member is provided with a main body part and a support part which supports a supported member, and the support part is formed of a material whose rigidity is higher than a rigidity of a material of the main body part and is partly embedded and fixed to the main body part.

Abstract: A drive device includes a drive part and a movable member structured to be moved by a drive force of the drive part. The movable member includes a main body part and a support part which supports a supported member. The support part includes an elastic support part which urges the supported member and a fixed support part which is provided so as to face the elastic support part in a moving direction of the movable member and supports the supported member urged by the elastic support part.

Abstract: A movement based display device configured to display full images to a user by moving light emitters through a user's field of view. The movement based display device includes a first movable member. The movement based display device further includes a first light emitter array, comprising a plurality of light emitters, coupled to the first movable member. The first light emitter array is configured to output light from the light emitters dependent on a position of the first movable member. The movement based display device further includes a first lens array. The first lens array is coupled to the first light emitter array. The first lens array comprises lenses configured to direct light into a first aperture, such as a user's eye.

Abstract: The present application discloses a display apparatus. The display apparatus includes a display panel and an optical main body. The display apparatus has a first eyepiece side for viewing image on a first objective side of the display apparatus, and a second eyepiece side for viewing image on a second objective side of the display apparatus. The optical main body includes a first lens on a light emitting side of the display panel, and a transflective mirror between the first eyepiece side and the first objective side of the display apparatus and between the second eyepiece side and the second objective side of the display apparatus.

Abstract: A near eye display comprising: a display device; and a waveguide; wherein the waveguide comprises an entry diffractive element and an exit diffractive element; wherein the display device is arranged to direct light into the waveguide via the entry diffractive element and wherein the exit diffractive element is arranged to direct light from the waveguide towards a user's eye; wherein the display device is arranged to output images in a repeating sequence of two or more different colours. Providing the images are transmitted in sufficiently quick succession, the brain will not perceive them as separate images, but will instead essentially merge them (as if they were overlaid on top of one another. As the brain is good at pattern recognition, it can compensate for any minor misalignments that occur between the different images. In this way the time-multiplexing approach avoids the need for multiple parallel waveguides for each specific colour or colour band.

Abstract: The present invention relates to an apparatus equipped with a depth of field control function for enabling augmented reality, which is capable of controlling the depth of field and focus and also preventing an image from being blurred due to diffraction by using a pseudo-pinhole effect. The apparatus includes: a display unit configured to generate a virtual image; a circular depth of field control unit configured to have a size in a range from 50 to 700 ?m, and also configured to reflect the virtual image generated in the display unit, to increase the depth of field of the virtual image, and to then enable the virtual image to reach an eye of the user; and a frame part configured such that the display unit and the depth of field control unit are installed thereon or therein, and also configured to enable the user to wear the apparatus for enabling augmented reality.

Abstract: A head-mounted display (HMD) including multiple layered display panels. The HMD may include a first display panel to display a first image, and a second display panel positioned in front of the first display panel to at least partially overlap with the first display panel. The second display panel may include a display substrate, and a plurality of light emitting diodes (LEDs) positioned on the display substrate. The plurality of LEDs display a second image. The display substrate and the plurality of LEDs are transparent for the first image to be visible through the second display panel.

Abstract: A light beam combiner and splitter included in a head-mounted display serving as an image display device, when combining and splitting light beams R, G, and B of respective colors from laser sources, combines first components of light R1, G1, and B1 with small amounts of light amongst components of separated light beams of respective colors, thus generating modulated light. This attenuates the laser beams emitted from the light source section.

Abstract: A head-mounted display device includes a display including a substrate and a plurality of display elements disposed on the substrate, a first polarizing layer disposed on the display, a reflective layer disposed on the first polarizing layer, a light-separating layer disposed on the reflective layer, a lens disposed on the light-separating layer, and a second polarizing layer disposed on the lens.

Abstract: A display device having an eyepiece is provided. The display device includes a display panel and an eyepiece. An image realized by the display panel may be provided to user through the eyepiece. An optical module may be disposed between the display panel and the eyepiece in order to increase a path of light. For example, the optical module may include a front quarter-wave plate, a half-mirror, a rear quarter-wave plate and a linear reflective polarizing plate, which are sequentially stacked. A positive C-plate may be disposed in the optical module. The light travelling toward the eyepiece from the display panel may pass through the positive C-plate. Thus, in the display device, the overall thickness may be reduced, and the viewing angle may be increased.

Abstract: An optical attenuator, when damaged, loses not only a light attenuation function but also part of an optical path shift function utilizing a refractive effect, and thus an optical path shift function in a normal state is lost. Thus, it is possible to diverts an optical path of modulate light, which is a laser beam, from a direction toward a mirror surface, that is, a direction toward the eye of an observer.

Abstract: A head mounted display system can include a camera, at least one waveguide, at least one coupling optical element that is configured such that light is coupled into said waveguide and guided therein, and at least one out-coupling element. The at least one out-coupling element can be configured to couple light that is guided within said waveguide out of said waveguide and direct said light to said camera. The camera can be disposed in an optical path with respect to said at least one out-coupling optical element to receive at least a portion of the light that is coupled into said waveguide via the coupling element and guided therein and that is coupled out from said waveguide by said out-coupling coupling element such that images may be captured by said camera.

Abstract: Systems and apparatus are described for a head-mounted display apparatus comprising at least one optical assembly. Each optical assembly may include a first curved lens including a first surface and a second surface, a second curved lens including a third surface and a fourth surface, the third surface being concave and including a beam splitter layer, the second curved lens being disposed between the first curved lens and an input filter assembly, and a display panel adapted to receive image content from an image projecting device and transmit the image content through the at least one optical assembly. The third surface of the second curved lens may have a radius of curvature that is larger than a radius of curvature of the second surface of the first curved lens.

Abstract: A headset system is described herein including a number of features including a frame and optical element. The headset system may include different combinations of bumper systems to permit the headset to accommodate different sized or dimensioned mobile device for use with the headset.

Abstract: An HMD includes a control unit configured to control a display position of an image displayed on a display region, and a storage unit configured to store a display position table including: distance information indicating a visual recognition distance perceived by a user for the image displayed on the display region, and the display position of the image displayed on the display region or a movement amount of the display position associated with the distance information. The control unit selects the distance information based on an operation received by an operation unit, and controls the display position of the image displayed on the display region according to the display position of the image or the movement amount of the display position associated with the selected distance information by the display position table.

Abstract: The disclosure discloses a manufacturing method of a liquid crystal display grating. The method includes preparing a substrate, depositing a transparent film layer on the substrate, patterning the transparent film layer for producing a plurality of containing grooves, depositing a liquid crystal alignment film in the containing grooves, injecting liquid crystal molecules in the containing grooves, aligning and packaging the liquid crystal molecules. The disclosure can achieve 3D display by the method above.

Abstract: An example apparatus for displaying stereo elemental images includes two coupled eyepieces. Each of the two eyepieces also includes a curved screen to display a number of elemental images. Each of the two eyepieces also includes a curved lens array concentrically displaced in front of the curved screen to magnify the elemental images. Each of the number of elemental images is magnified by a different lens in the curved lens array.

Abstract: The disclosure discloses a display device, and an operating method thereof. The display device includes an array of liquid crystal lenses, the array includes liquid crystal micro-lenses, each of which includes a first electrode layer and a second electrode layer, both of which have circular contour and are arranged in a direction of an axis thereof, and a liquid crystal layer located between the two electrode layers When the display device operates in a 2D display mode, the liquid crystal layer operates as planar glass under an action of an electric field generated between the first electrode layer and the second electrode layer; and when the display device operates in a 3D display mode, the liquid crystal layer operates as a convex lens under the action of the electric field generated between the first electrode layer and the second electrode layer.