Near-eye display devices, wearable devices

Abstract

The present disclosure provides a near-eye display device and a wearable device, which belongs to the field of near-eye display technology, and can at least partially solve the problem of crosstalk between light from different pixel islands in the existing near-eye display device. The near-eye display device disclosed in the present disclosure includes: a plurality of pixel islands and microlenses corresponding to the pixel islands one by one; the pixel islands are used to emit light to the corresponding microlens array so that the light reaches the predetermined viewing position after passing through the microlenses; wherein; the near-eye display device also includes: a plurality of super lens units, each super lens unit includes at least one super lens; the super lens unit corresponds to the pixel island one by one; the super lens unit is arranged on the side of the corresponding pixel island close to the corresponding micro lens, and the projection of the super lens unit on the plane where the pixel island is located covers the corresponding pixel island; the super lens unit is used to converge the light within a preset angle emitted by the corresponding pixel island to reduce the diffusion angle of the light emitted by the pixel island.

Description

Technical Field

[0001] The present disclosure belongs to the field of near-eye display technology, and specifically relates to a near-eye display device and a wearable device. Background Art

[0002] In recent years, near-eye display technology has been developing rapidly, among which virtual reality (VR) and augmented reality (AR) technologies are the most representative, bringing people an excellent audio-visual experience. Near-eye display technology is a technology that can project images directly into the eyes of the viewer, thereby achieving an immersive display experience. In practical applications, the light emitted by different parts of the near-eye display device is prone to crosstalk. Summary of the invention

[0003] The present disclosure at least partially solves the problem that light emitted from different parts of an existing near-eye display device is prone to crosstalk, and provides a near-eye display device and a wearable device.

[0004] The technical solution adopted to solve the technical problem of the present disclosure is a near-eye display device, comprising: a plurality of pixel islands and microlenses corresponding to the pixel islands one by one; the pixel islands are used to emit light to the corresponding microlens array, so that the light reaches a predetermined viewing position after passing through the microlens; wherein the near-eye display device also includes:

[0005] A plurality of super lens units, each super lens unit comprising at least one super lens; the super lens units correspond to the pixel islands one by one; the super lens unit is arranged on a side of the corresponding pixel island close to the corresponding micro lens, and the projection of the super lens unit on the plane where the pixel island is located covers the pixel island; the super lens unit is used to converge the light emitted by the corresponding pixel island to reduce the diffusion angle of the light emitted by the pixel island.

[0006] Optionally, each of the superlens units includes multiple superlenses, each pixel island includes multiple pixel units, and each of the superlenses corresponds one-to-one to each of the pixel units.

[0007] Optionally, the superlens includes: a substrate, and a plurality of nanocolumns arranged on the substrate; the aspect ratio of the nanocolumns ranges from [3:1 to 12:1].

[0008] Further optionally, the aspect ratio of the nanorods is 5:1.

[0009] Further optionally, the height of the nanocolumn is 350 nm to 550 nm, and the radius of the nanocolumn is 45 nm to 95 nm.

[0010] Optionally, the refractive index of the metalens is greater than 1.7.

[0011] Further optionally, the material of the nanorods includes silicon nitride.

[0012] Optionally, the near-eye display device further includes: a transparent substrate, the pixel island and the microlens are respectively fixed on opposite sides of the transparent substrate; and the superlens is located on a side of the transparent substrate close to the pixel island.

[0013] Optionally, the superlens and the plurality of microlenses are arranged in an array, and a spacing between two adjacent microlenses and a spacing between two adjacent microlenses in the same column are both between 0 and 10 mm.

[0014] Optionally, the diameter of the microlens is 30 μm to 10 mm.

[0015] Optionally, the distance between the pixel island and the corresponding microlens does not exceed the focal length of the microlens.

[0016] Optionally, the pixel unit includes an organic light emitting diode device or a micro light emitting diode device.

[0017] Optionally, the near-eye display device further includes: a substrate, and the microlens is arranged on a side of the substrate away from the microlens.

[0018] Optionally, the microlens and the substrate are an integrated structure.

[0019] Another technical solution adopted to solve the technical problem of the present disclosure is a wearable device, which includes any one of the above-mentioned near-eye display devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 It is a schematic structural diagram of a near-eye display device using a microlens-pixel island image plane splicing display technology in the related art.

[0022] Figure 2 Schematic diagram of the principle of stitching together different pixel islands of a near-eye display device to display an image.

[0023] Figure 3 A schematic diagram showing the principle of superimposing the images displayed by the red pixel islands and green pixel islands of a near-eye display device on the retina.

[0024] Figure 4Schematic diagram of light crosstalk phenomenon in a near-eye display device.

[0025] Figure 5 A schematic diagram of light transmission for a near-eye display device provided in some embodiments of the present disclosure.

[0026] Figure 6 Schematic diagram of the structure of the metalens provided in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0028] The terms used to describe the embodiments of the present disclosure herein are not intended to limit and / or define the scope of the present disclosure. For example, unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by a person of ordinary skill in the field to which the present disclosure belongs. It should be understood that the "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. Unless the context clearly indicates otherwise, the singular form "one", "one" or "the" and similar words do not represent quantitative restrictions, but represent the presence of at least one.

[0029] The present disclosure will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale. In addition, some well-known parts may not be shown in the drawings.

[0030] Many specific details of the present disclosure are described below, such as component structures, materials, dimensions, processing techniques, and technologies, in order to more clearly understand the present disclosure. However, as those skilled in the art will appreciate, the present disclosure may be implemented without following these specific details.

[0031] At present, the mainstream near-eye display technologies include: waveguide display technology, free-form surface display technology, integrated imaging light field display technology and microlens-pixel island image plane splicing display technology. Among them, waveguide display is sensitive to the wavelength of incident light, and is prone to dispersion, and "ghost images" and other phenomena will appear during wearing. In free-form surface display technology, the overall size of the device is large, and it is difficult to balance the large field of view and the size of the device. It is difficult for integrated imaging light field display to achieve the transmission of external light, and the augmented reality display effect is poor. Microlens-pixel island image plane splicing display technology fits microlenses with regional micro-display pixel islands. Each group of microlens-pixel islands combines to display a part of the sub-image in the overall image, and projects the overall image into the human eye through image plane splicing, which can bring a wider visual experience and is conducive to the realization of lightweight equipment, thus becoming an important display technology in the future field of enhanced display / virtual display.

[0032] Figure 1 Schematic diagram of the structure of a near-eye display device using a microlens-pixel island image plane splicing display technology in the related art, such as Figure 1 As shown, a near-eye display device using a microlens-pixel island image plane splicing display technology includes: a plurality of microlenses arranged on one side of a transparent substrate 10 and a plurality of pixel islands arranged on the other side of the transparent substrate, and the pixel islands correspond to the microlenses one by one. Each pixel island 11 is equivalent to a small display screen. The microlenses are used for imaging, and the light emitted by the pixel island 11 passes through the corresponding microlens 12 and enters the human eye 13, so that the human eye 13 can see the displayed image. Among them, for the human eye 13, the displayed image seen is an enlarged virtual image, which is located at a certain depth of field on the side of the pixel island 11 array facing away from the microlens 12. In addition, there are intervals between the pixel islands 11, and there are also intervals between the microlenses 12. External ambient light can enter the human eye 13 from the intervals between the pixel islands 11 and the intervals between the microlenses 12, so that the human eye 13 can see the displayed image of the pixel island 11 and the external object 14 at the same time, realizing augmented reality display.

[0033] The principle of splicing and displaying images by different pixel islands 11 is as follows: the light beams emitted by each pixel unit (sub-pixel) on the pixel island 11 are refracted by the microlens 12 to form a beam of parallel light that is directed to the lens and converges on the retina; for the human eye 13, when two beams of parallel light with a certain width and the same angle enter the human eye 13, they will converge at the same position on the retina; parallel light incident at different angles will converge at different positions on the retina. Therefore, by reasonably controlling the angle of light incident on the lens, the images displayed by different pixel islands 11 can be spliced ​​on the retina. Figure 2 Schematic diagram of the principle of splicing different pixel islands of a near-eye display device to display an image. Figure 2The principle of splicing display of two pixel islands 111 and 112 is only exemplarily shown. It should be understood that in actual applications, more pixel islands can be spliced ​​for display. In order to more clearly show the light path diagram of the light emitted by the two pixel islands 111 and 112, Figure 2 The light emitted by the two pixel islands 111 and 112 is represented by a solid line and a dotted line respectively. Figure 2 As shown, the pixel island 111 displays an inverted letter "B" and a portion of an inverted letter "O", and the pixel island 112 displays another portion of the inverted letter "O" and an inverted letter "E". The light emitted by the pixel island 111 falls on the A region of the retina 132 after passing through the microlens 12 and the lens 131, and the light emitted by the pixel island 112 falls on the B region of the retina 132 after passing through the microlens 12 and the lens 131, thereby splicing into a positive "BOE" pattern on the retina 132.

[0034] In some embodiments, the plurality of pixel islands 11 in the pixel island array can respectively emit light of a plurality of different colors, for example, red, blue and green (for ease of description, the pixel islands emitting red light are referred to as "red pixel islands", the pixel islands emitting green light are referred to as "green pixel islands", and the pixel islands emitting blue light are referred to as "blue pixel islands"). The target image to be displayed can be regarded as a superposition of a red component image, a green component image and a blue component image. When the near-eye display device is displayed, each red pixel island 11r displays a portion of the red component image, each green pixel island 11g displays a portion of the above green component image, and each blue pixel island displays a portion of the above blue component image. The images displayed by all the red pixel islands 11r can be spliced ​​to form a red component image, the images displayed by all the green pixel islands 11g can be spliced ​​to form a green component image, and the images displayed by all the blue pixel islands can be spliced ​​to form the above blue component image. The red component image, the blue component image and the blue component image are superimposed on the retina of the human eye 13 to form a complete target image.

[0035] Reference Figure 1 All the pixel islands 11 can be divided into multiple groups, each group includes a red pixel island 11r, a green pixel island 11g and a blue pixel island. The images displayed by the three pixel islands 11 in the same group fall into the same area on the retina 132, forming a superposition effect, so that the viewer can see the superimposed image, that is, the red component image, the blue component image and the blue component image are superimposed on the retina 132 of the human eye 13. Figure 3 This is a schematic diagram of the principle of superimposing the images displayed by the red pixel island 11r and the green pixel island 11g of the near-eye display device on the retina. Figure 3The image superposition principle of the red pixel island 11r and the green pixel island 11g is only exemplarily shown. It should be understood that in actual applications, the images displayed by the three pixel islands 11 in the same group are superimposed together. Figure 1 and Figure 3 As shown in FIG. 1 , the light emitted by the red pixel island 11r passes through the microlens 12 and the lens 131 and falls into the area C on the retina 132. The light emitted by the green pixel island 11g passes through the microlens 12 and the lens 131 and falls into the area C on the retina 132. As a result, the images displayed by the red pixel island 11r and the green pixel island 11g are superimposed in the area C. Figure 1 The display of the near-eye display device shown has certain limitations. Since the light-emitting angle of the pixel island 11 is relatively large, crosstalk between lights of different colors will occur, thereby causing poor imaging effects and affecting user experience. Figure 4 Schematic diagram of the crosstalk phenomenon of different color lights in a near-eye display device. Figure 4 As shown, a portion of the light L1 emitted by the green pixel island 11g will hit its corresponding microlens 12 and enter the human eye. This portion of light is the effective light required for imaging. In addition, a portion of the light L2 will hit the adjacent microlens 12, and this portion of light will superimpose cross-colors of different colors in the imaged image, making the color distribution of the viewed image uneven; another portion of the light L3 will hit the transparent area between the microlenses 12, causing light leakage. At this time, a bright circle of light will be superimposed around the image seen by the user, affecting the user experience.

[0036] In other embodiments, each pixel island in the pixel island array can emit a plurality of different colors of light. Each pixel island includes a plurality of pixel units of different colors (a pixel island that emits a plurality of different colors of light is called a "full-color pixel island"). Specifically, a plurality of pixel units of different colors can be arranged in an array, for example, a row of red pixel units (sub-pixels), a row of green pixel units, and a row of blue pixel units arranged in sequence in the column direction constitute a group of pixel units, and each pixel island includes one or more pixel unit groups. It should be noted that when the pixel island is a full-color pixel island, the luminous colors of its pixel units include but are not limited to red, green, blue and other colors, and may also include other colors such as white and yellow. When the near-eye display device is displayed, the various color pixel units of each pixel island respectively display component images of different colors. At this time, each pixel island is equivalent to a small full-color display screen, directly displaying a part of the image. Among them, in this near-eye display device, there are also problems such as light leakage or cross-color caused by stray light at a large luminous angle of the pixel island.

[0037] In some embodiments of the present disclosure, a plurality of microlenses 12 constitute a microlens array, and the plurality of microlenses 12 are arranged in a plurality of rows and columns.

[0038] A plurality of pixel islands 11 constitute a pixel island array, and the pixel islands 11 correspond to the microlenses 12 one by one. The pixel islands 11 are used to emit light to the corresponding microlenses 12, so that the light reaches the predetermined viewing position after passing through the microlenses 12. The predetermined viewing position refers to the position where the eyes of the user are located when using the near-eye display device. The plurality of pixel islands 11 of the pixel island array emit light of multiple colors. For example, each of the plurality of pixel islands of the pixel island array can emit light of red, green and blue (and the pixel is a full-color pixel island); for another example, the plurality of pixel islands 11 of the pixel island array are divided into a plurality of groups, each group includes three pixel islands 11, and the three pixel islands 11 in the same group emit red, green and blue light, respectively, so that the plurality of pixel islands 11 of the pixel island array emit three colors of light. For another example, each group includes four pixel islands 11, and the four pixel islands 11 in the same group emit red, green, blue and yellow light, respectively, so that the plurality of pixel islands 11 of the pixel island array emit four colors of light.

[0039] The near-eye display device provided by the embodiment of the present disclosure also includes: a plurality of super lens units 3, each super lens unit 3 includes at least one super lens; the super lens units 3 correspond to the pixel islands one by one; the super lens unit 3 is arranged on a side close to the corresponding micro lens, and the projection of the super lens unit 3 on the plane where the pixel island is located covers the corresponding pixel island; the super lens unit 3 is used to converge the light within a preset angle emitted by the corresponding pixel island to reduce the diffusion angle of the light emitted by the pixel island.

[0040] Among them, the super lens unit 3 can correspond to a monochrome pixel island or a full-color pixel island. The one-to-one correspondence between the super lens unit 3 and the pixel island means that the projection of the super lens unit 3 on the plane where the pixel island is located covers the corresponding pixel island, so that the light emitted by each pixel unit in the pixel island can basically enter the super lens, so as to realize the convergence of the light emitted by the pixel island by the super lens unit.

[0041] The embodiment of the present disclosure can avoid the occurrence of cross-color of the light emitting colors of the pixel islands 11 of different colors by setting the super lens unit 3. Figure 5As shown, the light emitted by each pixel island passes through the super lens unit 3 before entering the microlens. Among them, the light emitted by the pixel island emits light at a Lambertian body angle, and the light emission angle is relatively large, and the super lens unit 3 can converge the light at a large angle and reduce the light diffusion range. In this way, after the light emitted by the pixel island passes through the super lens unit 3, when it enters the corresponding microlens, the light diffusion angle is relatively small. Among the emitted light, except for the normal imaging light beam, there is basically no diffused stray light in the surroundings, so that transparent stray light will not be formed in the transparent area between different microlenses, and there will be no light diffusion to the microlenses corresponding to other surrounding pixel islands. Therefore, there will be no light leakage and no cross-color stray light, so that the imaging effect of the microlens at the predetermined position is improved, that is, the display performance of the near-eye display device is improved.

[0042] Specifically, refer to Figure 5 Although the light emitted by the pixel island is divergent, it is mainly concentrated within a certain angle range. In the embodiment of the present disclosure, the preset angle refers to the angle range where the light of the pixel island or pixel unit is concentrated, which includes both imaging light beams and stray light beams. Although the light beams beyond this range may set adjacent pixel islands, they will basically not affect the display due to their weak brightness. In the embodiment of the present disclosure, a super lens is set on the side of the light emitting surface of the pixel island close to the corresponding microlens unit to converge the light emitted by it. Among them, since the light emitted by the pixel island is divergent, and the light passes through a multi-layer structure such as a protective layer and a packaging film layer 4 before reaching the super lens unit, it has diffused at a certain angle when it reaches the super lens unit. Therefore, the area of ​​the super lens unit should be slightly larger than the area of ​​the pixel island to ensure that it has a converging effect on the light within a predetermined angle.

[0043] In the disclosed embodiments, the superlens usually has a high refractive index, and can form a periodic nano-level structure by exposure and development of electron beam photosensitive materials, and the transmittance of the structure to the entire visible light band is between 80% and 100%, which is higher than the light transmission rate of conventional polarizers, filters and other light modulation structures in the prior art. Therefore, the superlens has a good light output effect, which helps to improve the light output efficiency of the display device. In addition, referring to Table 1 below, compared with the technical solution of using filters, shading layers and other structures in the prior art to block the light from the pixel island to the microlens, the disclosed embodiments do not block stray light, but converge the surrounding large-angle light, so that the transparent stray light and cross-color stray light that may have been formed due to divergence can be used as normal imaging light, thereby effectively ensuring the utilization rate of the light emitted by the pixel island and improving the display brightness.

[0044] Table 1. Comparison of light output effects of near-eye display devices

[0045]

[0046] The superlens uses the micro-nano structure of nanopillars 32 to planarize the lens and produce a convergence effect similar to that of a geometric lens. In addition, since the superlens is a nanoscale device, its thickness is small, which can meet the requirements of thin and light near-eye display devices.

[0047] Specifically, in some embodiments, the superlens includes: a substrate, and a plurality of nanopillars 32 disposed on the substrate. Compared with the traditional geometric optical lens which only adjusts the phase of the incident light to achieve focusing by changing the thickness of the glass, the superlens is a supersurface lens, which is an ultra-thin two-dimensional array plane composed of a series of sub-wavelength artificial microstructures. It has the characteristics of relatively simple manufacturing, relatively low loss, small size and thin thickness. By selecting and setting the specifications of the nanopillars 32, it is possible to achieve flexible and effective control of the amplitude, phase, propagation mode, polarization state and other aspects of the electromagnetic wave. The nanopillar 32 is a nanoscale columnar structure with different radii at both ends, and its materials generally include silicon nitride (Si3N4), titanium dioxide (TiO2), etc. Reference Figure 6 In the microlens, by setting a plurality of nanocolumns 32 with different aspect ratios and designing the orientation of the wide end and the narrow end of the nanocolumn 32, a superlens that meets the light convergence requirements is formed. Specifically, in the microlens, the nanocolumns 32 can be arranged in a mixed alternating manner with positive and negative structures. Among them, the positive and negative structures are used to distinguish the nanocolumns 32 with a wide end at one end close to the substrate from the nanocolumns 32 with a narrow end at one end close to the substrate. One of the two nanocolumns 32 with different settings can be regarded as a positive structure, and the other as a negative structure. When the positive and negative structures are mixed and arranged alternately, the aspect ratios of the nanocolumns 32 as the positive structure or the negative structure can also be different. It can be set according to different needs.

[0048] In some embodiments, each super lens unit 3 includes multiple super lenses, each pixel island includes multiple pixel units, and each super lens corresponds to each pixel unit one by one. The micro lens is a nanometer-level device, which is much smaller than the size of a traditional geometric optical lens, and its size can correspond to the size of a pixel unit. It is understandable that there is also a certain gap between multiple pixel units in the pixel island, and the light emitted by the pixel unit is emitted at a Lambertian angle, which is bound to have a certain impact on adjacent pixel units. Specifically, although the luminous color of the pixel units in the pixel island is consistent, when the light of the pixel island unit is projected into the adjacent pixel unit, a same-color crosstalk beam is formed, which will cause the imaged images to be superimposed, resulting in visual re-imaging, contrast reduction and other problems. In the disclosed embodiment, the super lens is corresponded to the pixel unit one by one, and the light emitted by the corresponding pixel unit is converged by the super lens, so that the light crosstalk between different pixel units can be avoided, thereby effectively improving the display clarity.

[0049] Among them, according to the specific type of near-eye display device, in some embodiments, the superlens in each superlens unit can correspond to pixel units of the same color, that is, the superlens unit corresponds to a monochrome pixel island, or the superlens of each superlens unit can also correspond to pixel units of different colors, that is, the superlens unit corresponds to a full-color pixel island.

[0050] In some embodiments, the aspect ratio of the nanorod 32 ranges from 3:1 to 12:1. Experimental data show that when the aspect ratio of the nanorod 32 is within the above range, the light collection effect of the display island is better, and the problem of removing cross-color stray light and transparent stray light in the near-eye display device can be basically met. Further, in some embodiments, the aspect ratio of the nanorod 32 includes 5:1.

[0051] In some embodiments, the height of the nanorod 32 is 350 nm to 550 nm, and the radius of the nanorod 32 is 45 nm to 95 nm. On the basis of meeting the requirements of the aspect ratio range of the nanorod 32, the nanorod 32 of the above dimensions (including height, radius and other dimensions) can meet the demand for light convergence, and at the same time will not cause great pressure on the existing limited production process, and has high feasibility.

[0052] Optionally, the refractive index of the super lens is greater than 1.7 to ensure the light extraction efficiency of the micro lens as a whole. Further, the refractive index of the super lens can be greater than 2-3.

[0053] In some embodiments, it also includes: a transparent substrate, the pixel island and the microlens are respectively fixed on opposite sides of the transparent substrate; and the superlens is located on a side of the transparent substrate close to the pixel island.

[0054] In some embodiments, the near-eye display device further includes: a transparent substrate 10, and the pixel island array and the microlens array are respectively fixed on opposite sides of the transparent substrate, so that the microlens array and the pixel island array can remain relatively fixed. Among them, the transparent substrate refers to a substrate with a light transmittance of more than 85%. The material of the transparent substrate is not specifically limited here. For example, the material of the transparent substrate can be SiNx (silicon nitride), silicon oxide (SiOx), SiOxNy (silicon oxynitride) or PMMA (polymethyl methacrylate). Since PMMA has a small mass, when PMMA is used as the material of the transparent substrate, it is beneficial to reduce the weight of the near-eye display device.

[0055] Of course, the embodiments of the present disclosure are not limited to the above-mentioned configuration, as long as the microlens array and the pixel island array can be kept relatively fixed. For example, a clamp can be set around the first substrate and the second substrate to keep the microlens array and the pixel island array relatively fixed.

[0056] It should be understood that the distance between the pixel island 11 and the corresponding microlens 12 does not exceed the focal length of the microlens 12, so that after the light emitted by the pixel island 11 hits the microlens 12, the image displayed by the pixel island 11 can form an enlarged virtual image on the side of the pixel island 11 away from the microlens 12. The distance between the pixel island 11 and the microlens 12 refers to the vertical distance from the pixel island 11 to the microlens 12. When the distance between the pixel island 11 and the microlens 12 is equal to the focal length of the microlens 12, the light emitting surface of the pixel island 11 is located on the focal plane of the microlens 21. In practical applications, the distance between the pixel island 11 and the microlens 12 can be set to a desired value by setting the thickness of the transparent substrate.

[0057] In some embodiments, the shape of the orthographic projection of the pixel island 11 on the transparent substrate is a square. The pixel island 11 includes a plurality of pixels, for example, the pixel island 11 includes 10*10 pixels, and the luminous color of each pixel in the same pixel island 11 can be the same. Each pixel includes an OLED (Organic Light-Emitting Diode) device or a micro-LED (micro-Light-Emitting Diode) device.

[0058] Micro-LED can also be called micro-LED grain or micro-LED chip, which mainly includes a p-type semiconductor layer, a light-emitting layer and an n-type semiconductor layer stacked in sequence. In addition, micro-LED also includes a p-electrode electrically connected to the p-type semiconductor layer and an n-electrode electrically connected to the n-type semiconductor layer.

[0059] An OLED device may mainly include an anode, a cathode and a light-emitting functional layer disposed between the anode and the cathode. The light-emitting functional layer may specifically include: a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer.

[0060] The embodiment of the present disclosure does not specifically limit the shape of the microlens 12, and the shape of the microlens 12 can be circular, square, hexagonal, etc. Among them, the shape of the microlens 12 refers to the shape of the positive projection of the microlens 12 on the transparent substrate. The present disclosure takes the shape of the microlens 12 as a circle as an example for explanation. Among them, the diameter of the microlens 12 is between 30μm-10mm, for example, the diameter of the microlens 12 is 500μm or 1mm or 2mm. The spacing between two adjacent microlenses 12 in the same row and the spacing between two adjacent microlenses 12 in the same column are both between 0-10mm, for example, 500μm or 1mm or 2mm.

[0061] In some embodiments, there is a spacing area between at least two adjacent microlenses 12, so that the external ambient light can enter the human eye from the spacing area between the microlenses 12, so that the human eye can see the image displayed by the pixel island 11 and the external environment at the same time, achieving an augmented reality effect. It should be noted that the "two adjacent microlenses 12" in the present disclosure refers to the two microlenses 12, and there is no other microlens 12 between them.

[0062] In some embodiments, the microlenses 12 may be arranged in the following manner: in even-numbered rows, there is no spacing between any two adjacent microlenses 12, that is, the spacing is 0; in odd-numbered rows, the spacing between any two adjacent microlenses 12 may be equal to the diameter of the microlens 12; in odd-numbered columns, there is no spacing between any two adjacent microlenses 12, that is, the spacing is 0; in even-numbered columns, the spacing between any two adjacent microlenses 12 may be equal to the diameter of the microlens 12.

[0063] It can be understood that the predetermined viewing position, the center of the pixel island 11 and the center of its corresponding microlens 12, and the center of the microlens unit are located on the same straight line, so that the light emitted from the pixel island 11 to the microlens 12 can pass through the microlens unit 3. In addition, the arrangement of the microlens unit 3 can be the same as the arrangement of the microlens 12. When the overall contour shape of the microlens unit 3 is the same as the shape of the pixel island 11, both are squares, in the microlens unit 3, each adjacent microlens unit 3 in the even-numbered rows has no spacing, that is, the spacing is 0; the spacing between each adjacent two microlens units 3 in the odd-numbered rows can be equal to the width of the microlens unit 3; each adjacent two microlens units 3 in the odd-numbered columns have no spacing, that is, the spacing is 0; the spacing between each adjacent two microlens units 3 in the even-numbered columns can be equal to the width of the microlens unit 3.

[0064] It should be noted that Figure 5 The number and arrangement of the microlenses 12 are only exemplary. In practical applications, other numbers and arrangements may also be used. In addition, the outer contour shape of the microlens unit 3 is not limited to the above-mentioned square, and may also be the same shape as the microlens 12, such as a circle; or other shapes, such as a hexagon, etc. As long as the light emitted from the pixel island 11 to the corresponding microlens 12 can be completely received by the microlens unit 3.

[0065] The present disclosure also provides a wearable device, including the near-eye display device provided in the above embodiment; in addition, the wearable device also includes a housing, and the near-eye display device is arranged on the housing. The housing can be a helmet, a glasses frame, etc.

[0066] Since the near-eye display device provided by the above embodiment can eliminate the problems of color crosstalk and chromatic aberration stray light between monochrome pixel islands and improve the imaging effect, and at the same time can improve the light output efficiency of the near-eye display device and improve the imaging effect, wearable devices using the above near-eye display device can improve user experience.

[0067] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0068] The embodiments of the present disclosure are described above, and these embodiments do not describe all the details in detail, nor do they limit the disclosure to the specific embodiments described. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present disclosure, so that those skilled in the art can make good use of the present disclosure and the modifications based on the present disclosure. The present disclosure is limited only by the claims and their full scope and equivalents.

Claims

1. A near-eye display device, comprising: A plurality of pixel islands and micro lenses corresponding to the pixel islands one by one; The pixel island is used to emit light to the corresponding microlens array, so that the light reaches a predetermined viewing position after passing through the microlens; wherein the near-eye display device further includes: A plurality of super lens units, each of which includes at least one super lens, wherein the super lens is an ultra-thin two-dimensional array plane composed of a series of sub-wavelength artificial microstructures; the super lens units correspond to the pixel islands one by one; the super lens unit is arranged on a side of the corresponding pixel island close to the corresponding micro lens, and the projection of the super lens unit on the plane where the pixel island is located covers the corresponding pixel island; the super lens unit is used to converge the light within a preset angle emitted by the corresponding pixel island to reduce the diffusion angle of the light emitted by the pixel island; The superlens includes: a first substrate, and a plurality of nanocolumns arranged on the first substrate; the nanocolumns are nanoscale columnar structures with different radii at both ends, one end of which is recorded as a wide end and the other end is recorded as a narrow end; the plurality of nanocolumns include positive structures and negative structures; one of the positive structure and the negative structure is a nanocolumn with a wide end close to the first substrate, and the other is a nanocolumn with a narrow end close to the first substrate; and the positive structure and the negative structure are mixed and arranged alternately; the superlens is provided with a plurality of nanocolumns with different aspect ratios.

2. The near-eye display device according to claim 1, wherein: Each of the super lens units includes a plurality of super lenses, each pixel island includes a plurality of pixel units, and each of the super lenses corresponds one-to-one to each of the pixel units.

3. The near-eye display device according to claim 1, wherein: The aspect ratio of the nanorods is in the range of [3:1 to 12:1].

4. The near-eye display device according to claim 3, wherein: The aspect ratio of the nanorods is 5:

1.

5. The near-eye display device according to claim 3, wherein: The height of the nanocolumn is in the range of 350 nm to 550 nm, and the radius of the nanocolumn is in the range of 45 nm to 95 nm.

6. The near-eye display device according to claim 3, wherein: The refractive index of the metalens is greater than 1.

7.

7. The near-eye display device according to claim 6, wherein: The material of the nanorods includes silicon nitride.

8. The near-eye display device according to claim 1, wherein: Also includes: A transparent substrate, wherein the pixel island and the microlens are respectively fixed on two opposite sides of the transparent substrate; The super lens is located on a side of the transparent substrate close to the pixel island.

9. The near-eye display device according to claim 1, wherein: The superlens and the plurality of microlenses are arranged in an array, and the spacing between two adjacent microlenses and the spacing between two adjacent microlenses in the same column are both between 0 and 10 mm.

10. The near-eye display device according to any one of claims 1 to 9, wherein: The diameter of the microlens is in the range of 30 μm to 10 mm.

11. The near-eye display device according to any one of claims 1 to 9, wherein: The distance between the pixel island and the corresponding microlens does not exceed the focal length of the microlens.

12. The near-eye display device according to any one of claims 1 to 9, wherein: The pixel unit includes an organic light emitting diode device or a micro light emitting diode device.

13. The near-eye display device according to any one of claims 1 to 9, wherein: The near-eye display device further includes: a second substrate, and the microlens is arranged on a side of the second substrate away from the superlens.

14. The near-eye display device according to claim 13, wherein: The microlens and the second substrate are an integrated structure.

15. A wearable device, wherein: A near-eye display device comprising any one of claims 1 to 14.

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