A near-eye display device

Abstract

The application discloses a near-eye display device, comprising a laser array, a prism and a curved mirror. The laser emitted by the laser array is incident on the prism, reflected by the prism to the curved mirror, reflected by the curved mirror to the prism again, and transmitted to the human eye through the prism. The laser array has the advantages of good monochromaticity, high brightness, long service life, wide color gamut and the like, image display is performed by using the laser array, the display brightness and contrast of the image can be improved, and the visual experience of the near-eye display device is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a near-eye display device. Background Technology

[0002] In recent years, augmented reality (AR) glasses that use micro organic light-emitting diodes (Micro-OLEDs) as light sources have shown a certain development trend. Micro-OLEDs have advantages such as self-illumination, fast response speed, and small size, which enables AR glasses to achieve a thinner and lighter design.

[0003] However, during the emission process of Micro-OLED, some light is absorbed or scattered internally, resulting in a relatively low proportion of light reaching the user's eyes and insufficient brightness. Furthermore, because Micro-OLED emits light similarly to a Lambertian display, the emitted beam angle is very large. This large-angle beam can cause uncontrolled reflection and refraction during propagation, creating stray light that interferes with image display and reduces image contrast. Utility Model Content

[0004] This application provides a near-eye display device that can improve the brightness and contrast of images.

[0005] The near-eye display device provided in this application includes:

[0006] Laser arrays are used for image display.

[0007] A prism is located on the light-emitting side of the laser array; and

[0008] A curved mirror is located on the side of the prism that is away from the human eye;

[0009] The laser emitted from the laser array is incident on the prism and reflected by the prism to the curved reflector; the curved reflector reflects the incident laser back to the prism and transmits it to the human eye through the prism.

[0010] In some embodiments of this application, the laser array is one of a vertical cavity surface-emitting laser array, a micro laser diode array, and an edge-emitting laser array.

[0011] In some embodiments of this application, the near-eye display device includes two prisms, namely a first prism and a second prism glued together, wherein a beam-splitting layer is provided on the glued surface of the first prism and the second prism; the first prism is disposed close to the curved reflector, and the second prism is disposed close to the human eye;

[0012] The first prism includes a first surface, a second surface, and a third surface; the beam-splitting layer is disposed on the third surface; the laser emitted from the laser array enters the first prism through the first surface and then enters the second surface; the second surface totally reflects the incident laser onto the beam-splitting layer on the third surface; the beam-splitting layer directs the incident laser toward the second surface and through the second surface to the curved reflector; the curved reflector reflects the incident laser back to the first prism, and the laser enters the human eye through the first prism, the beam-splitting layer, and the second prism.

[0013] In some embodiments of this application, the beam splitter is a polarization beam splitter, which is used to transmit first linearly polarized light and reflect second linearly polarized light; the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other;

[0014] The laser emitted from the laser array includes at least second linearly polarized light;

[0015] The near-eye display device further includes: a phase retardation layer located between the first prism and the curved reflector; the phase retardation layer is used to convert the incident second linearly polarized light into first circularly polarized light and to convert the incident second circularly polarized light into the first linearly polarized light; the first circularly polarized light and the second circularly polarized light rotate in opposite directions.

[0016] In some embodiments of this application, the laser array is used to emit laser light in a first band, a second band, and a third band; wherein the laser light in the first band is first linearly polarized light, and the laser light in the second band and the laser light in the third band are second linearly polarized light.

[0017] The near-eye display device further includes a polarization converter located on the light-emitting side of the laser array, used to convert the laser light of the first wavelength band into the second linearly polarized light.

[0018] In some embodiments of this application, the polarization converter is a wavelength-selective waveplate or a metasurface.

[0019] In some embodiments of this application, the near-eye display device further includes:

[0020] An analyzer is located on the side of the polarization converter opposite to the laser array; the analyzer is used to transmit the second linearly polarized light.

[0021] In some embodiments of this application, the near-eye display device further includes:

[0022] A first imaging lens is located on a first surface of the first prism; and / or

[0023] The second imaging lens is located on the surface of the second prism facing the human eye.

[0024] In some embodiments of this application, the near-eye display device further includes:

[0025] A compensating lens is located on the side of the curved mirror that is away from the prism; the curvature of the surface of the compensating lens on the side away from the curved mirror is the same as the curvature of the surface of the second prism on the side facing the human eye.

[0026] In some embodiments of this application, the surface shape of the curved reflector is an aspherical surface or a freeform surface;

[0027] The surface of the curved mirror is provided with a partially reflective and partially transmissive film layer.

[0028] The near-eye display device provided in this application includes a laser array, a prism, and a curved reflector. The laser emitted from the laser array is incident on the prism and reflected by the prism towards the curved reflector. The curved reflector then reflects the incident laser back towards the prism, which then transmits the laser to the human eye. The laser array has advantages such as good monochromaticity, high brightness, long lifespan, and wide color gamut. Using a laser array for image display can improve the brightness and contrast of the image and enhance the visual experience of the near-eye display device. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is one of the structural schematic diagrams of the near-eye display device provided in the embodiments of this application;

[0031] Figure 2 This is a schematic diagram of the structure of the laser chip in the VCSEL array provided in the embodiments of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the laser chip in the EEL array provided in the embodiments of this application;

[0033] Figure 4 This is a second schematic diagram of the near-eye display device provided in the embodiments of this application;

[0034] Figure 5 This is the third schematic diagram of the near-eye display device provided in the embodiments of this application;

[0035] Figure 6Fourth schematic diagram of the near-eye display device provided in the embodiments of this application;

[0036] Figure 7 This is a schematic diagram of the structure of the laser array provided in an embodiment of this application;

[0037] Figure 8 Fifth schematic diagram of the near-eye display device provided in the embodiments of this application;

[0038] Figure 9 Sixth schematic diagram of the near-eye display device provided in the embodiments of this application;

[0039] Figure 10 Seventh schematic diagram of the near-eye display device provided in the embodiments of this application;

[0040] Figure 11 Eighth schematic diagram of the near-eye display device provided in the embodiments of this application;

[0041] Figure 12 This is the ninth schematic diagram of the near-eye display device provided in the embodiments of this application. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the application will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction described in this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of this application are for illustrating relative positional relationships only and do not represent actual scale.

[0043] Near-eye display devices are display devices worn on the user's eyes, usually in the form of glasses or helmets, and can provide users with virtual reality (VR) and augmented reality (AR) experiences.

[0044] Currently, AR glasses typically use micro organic light-emitting diodes (Micro-OLEDs) as their light source. Micro-OLEDs have advantages such as self-illumination, fast response speed, and small size, which enables AR glasses to achieve a thinner and lighter design.

[0045] However, during the emission process of Micro-OLED, some light is absorbed or scattered internally, resulting in a relatively low proportion of light reaching the user's eyes and insufficient brightness. Furthermore, because Micro-OLED emits light similarly to a Lambertian display, the emitted beam angle is very large. This large-angle beam can cause uncontrolled reflection and refraction during propagation, creating stray light that interferes with image display and reduces image contrast.

[0046] In view of this, embodiments of this application provide a near-eye display device that can effectively improve the brightness and contrast of images, thereby enhancing the visual experience of the near-eye display device.

[0047] Figure 1 This is one of the structural schematic diagrams of the near-eye display device provided in the embodiments of this application.

[0048] like Figure 1 As shown in the figure, a near-eye display device provided in this application embodiment includes: a laser array 1, a prism 2, and a curved reflector 3.

[0049] Laser Array 1 can directly emit laser light for image display. Compared to Micro-OLED, Laser Array 1 has better collimation and a smaller divergence angle, thus effectively projecting the vast majority of light into the human eye and avoiding light loss due to internal absorption and scattering, resulting in higher brightness and clearer image display. The more concentrated beam angle of Laser Array 1 reduces uncontrolled reflection and refraction during propagation, avoiding stray light interference from large-angle beams and significantly improving image contrast. Laser Array 1 can cover a wider color gamut, accurately reproducing colors and enhancing the visual experience of near-eye display devices.

[0050] The laser array 1 includes multiple pixel units. Specifically, the laser array 1 includes a driving substrate and multiple laser chips. The driving substrate provides driving signals, and the laser chips are located on and electrically connected to the driving substrate. Each laser chip serves as a pixel unit. The driving signals provided by the driving substrate can drive the laser chips to produce different brightness levels, thereby enabling the laser array to display images.

[0051] Prism 2 is located on the light-emitting side of laser array 1. Prism 2 is used to reflect and transmit the laser emitted from laser array 1, thereby changing the laser light path and reducing the size of the near-eye display device.

[0052] A curved reflector 3 is located on the side of prism 2 that faces away from the human eye E. The curved reflector 3 is used to image the incident laser and reflect it back to prism 2, so that it enters the human eye E.

[0053] The laser emitted from the laser array 1 is incident on the prism 2 and reflected by the prism 2 onto the curved mirror 3; the curved mirror 3 reflects the incident laser back onto the prism 2, and the laser is transmitted through the prism 2 to the human eye, so that the human eye can see the image displayed by the laser array 1.

[0054] Among them, such as Figure 1 As shown, prism 2 may include a first surface s1, a second surface s2, and a third surface s3. The laser emitted from laser array 1 enters prism 2 via the first surface s1 and then proceeds to the second surface s2. Due to the air gap between prism 2 and the reflecting surface 3, when the laser incident angle is greater than the critical angle, the laser undergoes total internal reflection at the second surface s2 of prism 2. The totally internally reflected laser then enters the third surface s3 of prism 2, which reflects the laser back towards the second surface s2 and through it to the curved reflecting mirror 3. The curved reflecting mirror 3 reflects the incident laser back to prism 2, and then it is transmitted through the second surface s2 and the third surface s3 to the human eye E.

[0055] In some embodiments, the surface of the curved reflector 3 is an aspherical or freeform surface, so that the curved reflector 3 can image the incident laser and reflect the laser to the human eye E.

[0056] The surface of the curved mirror 3 is provided with a partially reflective and partially transmissive film. Besides the laser emitted from the laser array 1 being reflected by the curved mirror 3, ambient light can also pass through the curved mirror 3 from the outside of the near-eye display device and enter the human eye E, such as... Figure 1 As shown in the a-optical path, this achieves the augmented reality display effect of the near-eye display device.

[0057] In specific implementation, the laser array 1 can be one of the following: a vertical-cavity surface-emitting laser (VCSEL) array, an edge-emitting laser (EEL) array, and a micro laser diode (Micro LD) array.

[0058] VCSEL is a semiconductor laser array characterized by laser emission perpendicular to the surface of a semiconductor substrate. The beam of a VCSEL is circularly symmetrical with a smaller divergence angle, allowing for direct coupling into an optical system without complex collimation. Furthermore, VCSELs utilize planar packaging, resulting in a smaller size and ease of integration into two-dimensional arrays. Compatible with semiconductor wafer fabrication processes, they can be directly bonded to circuit boards or semiconductor driver substrates, making them suitable for mass production.

[0059] like Figure 2As shown, the laser chip in the VCSEL array includes: a substrate 11a, a first Bragg reflector layer 11b, an active layer 11c, and a second Bragg reflector layer 11d.

[0060] The substrate 11a provides a growth platform for the multilayer epitaxial structure of the laser chip and also serves as the main heat dissipation component, conducting the heat generated by the laser chip during operation to the outside.

[0061] Both the first Bragg reflector 11b and the second Bragg reflector 11d are composed of dozens of alternating layers of high and low refractive index materials, exhibiting high reflectivity. The two Bragg reflector layers form a vertical optical resonant cavity. The second Bragg reflector 11d at the top can be designed to partially reflect and partially transmit, while the first Bragg reflector 11b at the bottom is designed to have high reflectivity, enabling laser output from the top.

[0062] The active layer 11c can be a multi-quantum-well layer, located between the first Bragg reflector layer 11b and the second Bragg reflector layer 11d, for carrier recombination luminescence.

[0063] In this design, the substrate 11a and the first Bragg reflective layer 11b are typically n-type doped, while the second Bragg reflective layer 11d is p-type doped. A top electrode is formed on the first Bragg reflective layer 11b, which can be a ring-shaped or mesh-like structure with a light-emitting window in the center. A bottom electrode is formed at the bottom of the substrate 11a, which can be a monolithic planar structure to ensure uniform current distribution.

[0064] Current is injected into the active layer 11c through the top and bottom electrodes, causing electrons and holes to recombine in the quantum well and release photons. The photons are reflected multiple times between the upper and lower Bragg reflectors, forming a standing wave. When the gain exceeds the loss, laser oscillation is generated, and the laser beam is output from one side of the top Bragg reflector, exhibiting a circular, symmetrical, and low-divergence angle.

[0065] The active area of ​​the laser chip in the VCSEL array is small, with a low operating threshold, low energy consumption, and high electro-optical conversion efficiency. Moreover, the spatial coherence of each light-emitting unit in the VCSEL array is relatively weak, and each VCSEL can be made into a VCSEL array with equal wavelength spacing, which can also reduce temporal coherence, weaken speckle, and improve the output quality of the projected image.

[0066] The characteristic of an EEL is that the laser emission direction is parallel to the surface of the semiconductor substrate, and the laser is emitted from the side of the chip. The laser emitted from an EEL array has a large divergence angle and the beam is elliptical, so a lens is required for shaping.

[0067] like Figure 3As shown, the laser chip in the EEL array includes: a substrate 12a, an n-type contact layer 12b, a first waveguide layer 12c, an active layer 12d, a second waveguide layer 12e, and a p-type contact layer 12f.

[0068] Substrate 12a provides a growth platform for the multilayer epitaxial structure of the laser chip, supports the entire multilayer structure, and undertakes the heat dissipation function, conducting the heat generated by the laser chip during operation to the outside.

[0069] The n-type contact layer 12b is located on the substrate 12a and is used for electron injection. It typically forms an ohmic contact with the n-type doped region to achieve effective current injection. The n-type contact layer 12b serves as a carrier transport channel to transport electrons to the first waveguide layer 12c.

[0070] The active layer 12d can be a multi-quantum-well layer, located between the first waveguide layer 12c and the second waveguide layer 12e, and is the region where electrons and holes radiatively recombine to generate photons.

[0071] The first waveguide layer 12c and the second waveguide layer 12e are made of low-refractive-index materials. The refractive indices of the first waveguide layer 12c and the second waveguide layer 12e are lower than the refractive index of the active layer 12d, thus allowing total internal reflection of light within the inner wall of the active layer 12d. The two waveguide layers effectively confine the light within the active layer 12d, reducing optical loss. The second waveguide layer 12e at the top and the first waveguide layer 12c at the bottom can form symmetrical or asymmetrical waveguide structures, providing a stable optical transmission path for laser oscillation. Typically, the first waveguide layer 12c is n-type doped, and the second waveguide layer 12e is p-type doped.

[0072] The p-type contact layer 12f is located on the side of the second waveguide layer 12e away from the active layer 12d and is used to inject holes. It usually forms an ohmic contact with the p-type doped region.

[0073] Under forward bias, electrons are injected from the n-electrode through the n-type contact layer 12b and the first waveguide layer 12c into the active layer 12d, while holes are injected from the p-electrode through the p-type contact layer 12f and the second waveguide layer 12e into the active layer 12d. In the active layer 12d, electrons and holes recombine to generate photons. Constrained by the first waveguide layer 12c and the second waveguide layer 12e, the photons propagate along the long axis of the resonant cavity. When the optical gain of the active layer 12d exceeds its internal losses, and the optical feedback provided by the resonant cavity surfaces at both ends meets the threshold condition, laser oscillation occurs, and the laser beam is ultimately output from the side of the active layer 12d.

[0074] EELs have the characteristic of emitting lasers from the side, requiring a reflecting prism to be placed on the emitting side to redirect the laser.

[0075] Laser array 1 can also be a Micro LD array. A Micro LD is a miniaturized laser device based on semiconductor materials. Its characteristic is that the resonant cavity structure is compressed to 1μm–5μm using micro-nano fabrication processes, forming an extremely strong optical field confinement in three-dimensional space, thereby achieving efficient laser oscillation. Micro LDs can be based on VCSELs or EELs. VCSEL-based Micro LDs retain vertical emission characteristics, with a circularly symmetrical beam, and further reduce the threshold current due to resonant cavity miniaturization, while achieving higher integration density. EEL-based Micro LDs continue the edge emission characteristics, and after miniaturization, they have advantages such as high power density and narrow linewidth.

[0076] In some embodiments, such as Figure 4 As shown, the near-eye display device includes two prisms, namely a first prism 21 and a second prism 22 glued together. A beam-splitting layer 23 is provided on the glued surface of the first prism 21 and the second prism 22. The first prism 21 is located near the curved reflector 3, and the second prism 22 is located near the human eye E.

[0077] The first prism 21 includes a first surface s1, a second surface s2, and a third surface s3. A beam-splitting layer 23 is disposed on the third surface s3. The laser emitted from the laser array 1 enters the first prism 21 through the first surface s2 and then enters the second surface s2. The second surface s2 totally reflects the incident laser onto the beam-splitting layer 23 on the third surface s3. The beam-splitting layer 23 directs the incident laser onto the second surface s2 and through it to the curved reflector 3. The curved reflector 3 reflects the incident laser back to the first prism 21, and then, after passing through the first prism 21, the beam-splitting layer 23, and the second prism 22, it enters the human eye E.

[0078] In some embodiments, the beam-splitting layer 23 is a polarization beam-splitting layer, used to transmit first linearly polarized light and reflect second linearly polarized light. In this embodiment, the polarization direction of the first linearly polarized light is parallel to the incident plane, i.e., the first linearly polarized light is p-polarized light; the polarization direction of the second linearly polarized light is perpendicular to the incident plane, i.e., the second linearly polarized light is s-polarized light. The polarization directions of the first and second linearly polarized light are perpendicular to each other. The polarization beam-splitting layer is used to transmit p-polarized light and reflect s-polarized light.

[0079] At this point, the laser emitted from laser array 1 includes at least second linearly polarized light (s-polarized light). For example... Figure 5 As shown, the near-eye display device also includes a phase retardation layer 4, located between the first prism 21 and the curved reflector 3. The phase retardation layer 4 is a thin film element with a fixed phase retardation function or a thin film held by a glass sheet.

[0080] The phase retardation layer 4 is used to convert the incident second linearly polarized light into first circularly polarized light, and vice versa. The first and second circularly polarized lights rotate in opposite directions. In this embodiment, the first circularly polarized light can be left-handed circularly polarized light, and the second circularly polarized light can be right-handed circularly polarized light. The phase retardation layer 4 can convert the incident s-polarized light into left-handed circularly polarized light, and can also convert the incident right-handed circularly polarized light into p-polarized light.

[0081] In practical implementation, the phase retardation layer 4 can be a λ / 4 waveplate. The specific optical path and laser polarization state conversion process are as follows: The second linearly polarized light (s-polarized light) emitted from the laser array 1 is incident on the first surface s1 of the first prism 21, and then on the second surface s2 inside the first prism 21. The second surface s2 completely reflects the incident laser onto the polarization beam splitter on the third surface s3. The polarization beam splitter completely reflects the incident second linearly polarized light (s-polarized light) onto the second surface s2. The second linearly polarized light then enters the phase retardation layer 4 from the second surface s2 and is converted into first circularly polarized light (left-handed circularly polarized light). The first circularly polarized light (left-handed circularly polarized light) is reflected by the curved mirror 3 and converted into second circularly polarized light (right-handed circularly polarized light). The second circularly polarized light (right-handed circularly polarized light) then enters the phase retardation layer 4 and is converted into first linearly polarized light (p-polarized light). The first linearly polarized light (p-polarized light) enters the first prism 21 and is completely transmitted to the human eye E by the polarization beam splitter. The phase delay layer 4 ensures that the incident laser is first reflected to the curved mirror 3, and also ensures that the laser reflected by the curved mirror 3 can be fully transmitted to the second prism 22 and then to the human eye E, thereby improving the light efficiency.

[0082] In some embodiments, the laser array 1 is used to emit laser light in a first band, a second band, and a third band. The first band laser is first linearly polarized light, and the second and third band lasers are second linearly polarized light. In this embodiment, the first band laser can be red laser, the second band laser can be green laser, and the third band laser can be blue laser; wherein the red laser is typically p-polarized light, and the green and blue lasers are typically s-polarized light.

[0083] like Figure 6 As shown, in order to convert all the first linearly polarized light (red laser) emitted from the laser array 1 into second linearly polarized light, the near-eye display device further includes a polarization converter 5, located on the light-emitting side of the laser array 1. When the laser emitted from the laser array 1 is incident on the polarization converter 5, all the first linearly polarized light is converted into second linearly polarized light, thereby enabling the polarization beam splitter to have high reflection efficiency for each wavelength of laser light emitted from the laser array 1.

[0084] In practical implementation, the polarization converter 5 can be a wavelength-selective waveplate or a metasurface.

[0085] For example, when the polarization converter 5 employs a wavelength-selective waveplate, its nanostructure is designed for the wavelength of the first band of laser light emitted from the laser array 1. When the first band of laser light is incident, the structure introduces a phase delay to its two orthogonal polarization components through interference, thereby changing the polarization direction and converting the first linearly polarized light into the second linearly polarized light. For the second and third bands of light, the structure cannot produce an effective phase delay, so the polarization direction remains unchanged.

[0086] When the polarization converter 5 employs a metasurface, it can be a dynamically zoomable metasurface based on a micro-electro-mechanical system (MEMS) architecture, whose surface is covered with an array of nanoscale microstructures with dimensions comparable to the laser wavelength of the first band. By specifically arranging and setting the parameters of the microstructure array, a phase delay effect is generated on the laser light of the first band, converting the first linearly polarized light into second linearly polarized light, while the polarization directions of the light in the second and third bands remain unchanged.

[0087] In some embodiments, the near-eye display device may include multiple laser arrays, each laser array emitting monochromatic laser light, and the laser light emitted by each laser array having a different wavelength. For example... Figure 7 As shown, a beam combining component 11 also needs to be set on the light-emitting side of the laser array to combine the lasers emitted from each laser array.

[0088] by Figure 7 Taking the structure shown as an example, a near-eye display device may include three laser arrays, all of which can be VCSELs, namely a first laser array 1r, a second laser array 1g, and a third laser array 1b. The first laser array 1r emits laser light in a first wavelength band, and its substrate and active layer can be made of GaAs, with an emitted laser wavelength of 630nm to 650nm. The second laser array 1g emits laser light in a second wavelength band, and its substrate and active layer can be made of GaN, with an emitted laser wavelength of 515nm to 540nm. The third laser array 1b emits laser light in a third wavelength band, and its substrate and active layer can be made of GaN, with an emitted laser wavelength of 450nm to 480nm.

[0089] The light combining component 11 includes a first light combining element 111, a second light combining element 112, and a third light combining element 113.

[0090] The first light combiner 111 is located on the light-emitting side of the first laser array 1r and is used to reflect the first wavelength of laser light emitted from the first laser array 1r toward the second light combiner 112. The first light combiner 111 may be a mirror or a reflective film.

[0091] The second light combiner 112 is located on the light-emitting side of the second laser array 1g. It is used to transmit the first band of laser light emitted from the first laser array 1r, reflect the second band of laser light emitted from the second laser array 1g, and emit the light towards the third light combiner 113. The second light combiner 112 can be a dichroic mirror or a dichroic film.

[0092] The third light combiner 113 is located on the light-emitting side of the third laser array 1b. It is used to transmit the first-band laser emitted from the first laser array 1r and the second-band laser emitted from the second laser array 1g, and to reflect the third-band laser emitted from the third laser array 1b, and to emit the laser towards the prism. The third light combiner 113 can be a dichroic mirror or a dichroic film.

[0093] This allows the laser beams emitted from the three laser arrays to be combined. Figure 7 The laser array's position and beam combining method shown are merely illustrative examples. When the laser array's position changes, the beam combining component can also take other forms. For example, three laser arrays can also be combined using a beam combining prism. This is not a limitation.

[0094] In some embodiments, such as Figure 8 As shown, the near-eye display device also includes an analyzer 6, located on the side of the polarization converter 5 away from the laser array 1. The analyzer 6 is used to transmit second linearly polarized light. The analyzer 6 only allows the second linearly polarized light to pass through and enter the subsequent optical system, thus filtering out stray light with other polarization directions.

[0095] In some embodiments, such as Figures 9-11 As shown, the near-eye display device also includes a first imaging lens 7 and / or a second imaging lens 8. For example... Figure 9 As shown, the near-eye display device may consist only of a first imaging lens 1, located on the first surface s1 of the first prism 21. Figure 10 As shown, the near-eye display device may consist only of the second imaging lens 8, located on the surface of the second prism 22 facing the human eye E. Figure 11 As shown, the near-eye display device may include both a first imaging lens 7 and a second imaging lens 8.

[0096] In specific implementations, the number and shape of the imaging lenses can be set as needed, and this application embodiment does not impose any limitations. By adding the first imaging lens 7 and / or the second imaging lens 8, the optical design has greater freedom, thereby improving the imaging quality.

[0097] In some embodiments, such as Figure 12As shown, the near-eye display device also includes a compensating lens 9, located on the side of the curved mirror 3 facing away from the prism. The curvature of the surface of the compensating lens 9 facing away from the curved mirror 3 is the same as the curvature of the surface of the second prism 21 facing the human eye E. Therefore, the compensating lens 9 can reduce distortion or aberration when external light enters the human eye E, thereby ensuring that the real picture observed by the human eye E is clear, natural, and without distortion.

[0098] In the near-eye display device provided in this application embodiment, a laser array 1 is used for image display. The laser array 1 has advantages such as good monochromaticity, high brightness, and long lifespan, thus improving the display brightness and contrast of the image and enhancing the visual experience of the near-eye display device.

[0099] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0100] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A near-eye display device, characterized in that, include: Laser arrays are used for image display. A prism is located on the light-emitting side of the laser array; and A curved mirror is located on the side of the prism that is away from the human eye; The laser emitted from the laser array is incident on the prism and reflected by the prism to the curved mirror; the curved mirror reflects the incident laser back to the prism and transmits it to the human eye through the prism; the surface of the curved mirror is provided with a partially reflective and partially transmissive film layer, and ambient light is transmitted from the outside of the near-eye display device through the curved mirror and into the human eye.

2. The near-eye display device as described in claim 1, characterized in that, The laser array is one of a vertical cavity surface-emitting laser array, a micro laser diode array, and an edge-emitting laser array.

3. The near-eye display device as described in claim 1, characterized in that, The near-eye display device includes two prisms, namely a first prism and a second prism glued together, and a beam-splitting layer is provided on the glued surface of the first prism and the second prism; the first prism is positioned close to the curved reflector, and the second prism is positioned close to the human eye; The first prism includes a first surface, a second surface, and a third surface; the beam-splitting layer is disposed on the third surface; the laser emitted from the laser array enters the first prism through the first surface and then enters the second surface; the second surface totally reflects the incident laser onto the beam-splitting layer on the third surface; the beam-splitting layer directs the incident laser toward the second surface and through the second surface to the curved reflector; the curved reflector reflects the incident laser back to the first prism, and the laser enters the human eye through the first prism, the beam-splitting layer, and the second prism.

4. The near-eye display device as described in claim 3, characterized in that, The beam splitter is a polarization beam splitter, which is used to transmit first linearly polarized light and reflect second linearly polarized light; the polarization directions of the first linearly polarized light and the second linearly polarized light are perpendicular to each other. The laser emitted from the laser array includes at least second linearly polarized light; The near-eye display device further includes: a phase retardation layer located between the first prism and the curved reflector; the phase retardation layer is used to convert the incident second linearly polarized light into first circularly polarized light and to convert the incident second circularly polarized light into the first linearly polarized light; the first circularly polarized light and the second circularly polarized light rotate in opposite directions.

5. The near-eye display device as described in claim 4, characterized in that, The laser array is used to emit laser light in a first band, a second band, and a third band; wherein the laser light in the first band is first linearly polarized light, and the laser light in the second band and the laser light in the third band are second linearly polarized light. The near-eye display device further includes a polarization converter located on the light-emitting side of the laser array, used to convert the laser light of the first wavelength band into the second linearly polarized light.

6. The near-eye display device as described in claim 5, characterized in that, The polarization converter is a wavelength-selective waveplate or a metasurface.

7. The near-eye display device as described in claim 5, characterized in that, The near-eye display device further includes: An analyzer is located on the side of the polarization converter opposite to the laser array; the analyzer is used to transmit the second linearly polarized light.

8. The near-eye display device as described in any one of claims 3 to 7, characterized in that, The near-eye display device further includes: A first imaging lens is located on a first surface of the first prism; and / or The second imaging lens is located on the surface of the second prism facing the human eye.

9. The near-eye display device as described in claim 8, characterized in that, The near-eye display device further includes: A compensating lens is located on the side of the curved mirror that is away from the prism; the curvature of the surface of the compensating lens on the side away from the curved mirror is the same as the curvature of the surface of the second prism on the side facing the human eye.

10. The near-eye display device according to any one of claims 1 to 7, characterized in that, The surface shape of the curved reflector is aspherical or freeform.

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