A biomimetic full-color near-eye display device based on metasurface

Abstract

The application discloses a kind of based on superstructure surface's biomimetic full-color near-eye display device, comprising: pixelated white light micro display screen, pixelated white light micro display screen is set to the frame or lens of biomimetic full-color near-eye display device, the light emitting surface side of pixelated white light micro display screen is provided with light collimator, four primary color superstructure surface structural color pixel array is set on the surface of light collimator, each color pixel in four primary color superstructure surface structural color pixel array is one-to-one corresponding with the white light pixel of pixelated white light micro display screen through light collimator, and color pixel includes four different color primary color sub-pixel;The light exit side of four primary color superstructure surface structural color pixel array is provided with spatial light modulator.The application can improve the integration, portability and stability of near-eye display device, so that near-eye display device is higher in color quality, while overcoming the problem of insufficient display color reproduction degree.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optoelectronic display, in particular to a biomimetic full-color near-eye display device based on super-structured surface. BACKGROUND

[0002] Near-eye display technology, as a representative of new display technology, has broad application prospects and many advantages. It provides high-definition, immersive, and personalized visual experiences, meeting the growing demand for diversity. This technology is not only widely used in personal consumer electronics, but also has important practical significance in education, medical care, entertainment, and vehicle display fields. In particular, in the medical and vehicle fields, near-eye display technology is considered a key direction for future development, with promising application prospects. The rise of this technology reflects people's pursuit of better and more personalized visual experiences, and also embodies the development trend of the near-eye display technology industry. With the continuous emergence of new display technologies, near-eye display technology occupies an important position in the industry. Its high performance and personalized characteristics are highly consistent with the direction of industrial development, providing new impetus for industrial innovation and progress. In terms of industrial scale and development trend, near-eye display technology shows great potential, bringing broad development space to the entire display industry. The internal relationship between this technology and industrial development drives the entire industry towards a more prosperous and mature future.

[0003] Full-colorization of near-eye display technology has been considered a challenging technology. Prism synthesis, RGB full-color, and color conversion method are common methods in full-color near-eye display technology. Prism synthesis is simple to implement and provides vivid and lifelike display effects; RGB full-color achieves more accurate color reproduction by combining three primary colors; color conversion method can achieve accurate color reproduction in specific situations. However, these methods may cause insufficient color reproduction, reduced device integration, increased device weight, and increased light loss in the industrialization of full-color near-eye display technology, leading to increased cost, decreased performance, and reduced user experience. SUMMARY

[0004] The applicant found that, in the face of the challenges in the background art, the super-structured surface born from modern micro-nano technology is considered an important optimization means for near-eye display technology. The super-structured surface is composed of subwavelength super-atoms designed by humans, has the advantages of super-high resolution and small size and is easy to integrate, and is considered a research focus of future integrated micro-nano optics. The super-structured surface structural color is inspired by biological photonic crystals and can realize the selection of specific wavelengths through the interaction of light and the designed super-structured surface. Compared with the traditional color conversion method, the super-structured surface structural color has strong environmental stability and can solve the stability problem in the quantum dot / fluorescent powder color conversion method. However, the transmission mode of the super-structured surface structural color cannot realize narrow half-height width, low sideband and high-quality spectrum color, so it is crucial to design a transmission mode of the super-structured surface structural color that can produce high-quality color.

[0005] At the same time, the applicant also found that the RGB combination color mixing method in the traditional display field cannot restore all colors in nature, such as orange red and the like, which is a serious challenge to the restoration of the actual scene in the near-eye display system. Although the human eye has three types of cone cells and can perceive most colors in nature, there are four types of cone cells in some birds and other animals that can perceive more colors in nature. Generally speaking, compared with animals with three types of cone cells, animals with four types of cone cells can perceive several hundred or even several thousand times more colors, so inspired by birds and other four-view animals, adding other colors that cannot be achieved in addition to the three primary colors can provide better color restoration and differentiation in near-eye display.

[0006] In view of the above part of the defects of the prior art, the technical problem to be solved by the present application is to provide a bionic full-color near-eye display device based on a super-structured surface, aiming to improve the integration, portability and stability of the near-eye display device and overcome the problem of insufficient display color restoration.

[0007] To achieve the above-mentioned purpose, the present application provides a bionic full-color near-eye display device based on a super-structured surface, which comprises: a pixelated white light micro display screen, the pixelated white light micro display screen is arranged on the frame or lens of the bionic full-color near-eye display device, the light emitting surface of the pixelated white light micro display screen is provided with a light collimator, the surface of the light collimator is provided with a four-primary-color super-structured surface structural color pixel array, each color pixel in the four-primary-color super-structured surface structural color pixel array corresponds to a white light pixel of the pixelated white light micro display screen one by one, and the color pixel comprises four primary color sub-pixels of different colors; and a spatial light modulator is arranged on the light emitting side of the four-primary-color super-structured surface structural color pixel array.

[0008] The bionic full-color near-eye display device is configured to: in response to a video display signal, the spatial light modulator switches or gray-scale controls each white light pixel in the pixelated white light micro display screen according to the video display signal; each white light pixel of the pixelated white light micro display screen passes through the spatial light modulator control to emit a non-coherent white light source required by the video display signal; the non-coherent white light source enters the four-primary-color metasurface structural color pixel array after angle adjustment by the light collimator, the four-primary-color metasurface structural color pixel array realizes selective transmission of specific wavelength light in the non-coherent white light source through electromagnetic wave resonance, and then the non-coherent white light source of each white light pixel is colored after passing through the corresponding color pixel to obtain color light; the color light enters the spatial light modulator for modulation.

[0009] Optionally, the pixelated white light micro display screen at least includes one of a Micro-LED display screen, a Micro-OLED display screen, a Micro-QLED display screen, and an LCoS display screen; wherein each white light pixel of the pixelated white light micro display screen has a separate adjustment switch and a bright-dark function.

[0010] Optionally, the light collimator at least includes one of a prism grating light collimator, a micro-nano structure grating light collimator, and a metasurface light collimator.

[0011] Optionally, the spatial light modulator at least includes one of a transmissive light modulator and a reflective light modulator.

[0012] Optionally, the color pixel of the four-primary-color metasurface structural color pixel array is composed of a plurality of super atoms, the width of the super atom is w, the spacing between the super atoms is d, the period of the super atom is p=(w+d), and the duty cycle of the super atom is k=w / (w+d); wherein the greater the k, the lower the sideband generated, and the higher the color purity corresponding to the color pixel, but the peak value is also limited, the k is optionally in the range of 0.8-0.83, and the period p of a single super atom increases, and the entire color will be red-shifted.

[0013] Optionally, the super atom is a one-dimensional grating, the length of the one-dimensional grating is 0.5um-50um, the length and width of the nanometer column are equal, and the one-dimensional grating structure has a polarization selection effect.

[0014] Optionally, the super atom is a two-dimensional nanometer column, and the two-dimensional nanometer column has polarization insensitivity.

[0015] Optionally, the super atom has a structure of vertical stacking of aluminum-dielectric material-silver-aluminum oxide from top to bottom on a silicon dioxide substrate, wherein the thickness of the silver, the dielectric material and the aluminum is 20 nm, and the thickness of the aluminum oxide is 200 nm.

[0016] Optionally, the primary color sub-pixel has a size of 1-50 um, and the dielectric material of the super atom has a refractive index of 1.37-3.

[0017] Optionally, each of the color pixels is composed of four primary color sub-pixels of red, green, blue and yellow, and the period p of the corresponding super atom of the four primary color sub-pixels of red, green, blue and yellow is 400 nm, 340 nm, 270 nm and 350 nm, respectively.

[0018] The beneficial effects of the present application are as follows: 1. The bionic full-color near-eye display device of the present application comprises: a pixelated white light micro display screen, which is arranged on the frame or lens of the bionic full-color near-eye display device; a light collimator is arranged on one side of the light emitting surface of the pixelated white light micro display screen; a four-primary-color super-structure color pixel array is arranged on the surface of the light collimator; each color pixel in the four-primary-color super-structure color pixel array corresponds to a white light pixel of the pixelated white light micro display screen through the light collimator; the color pixel comprises four primary color sub-pixels of different colors; and a spatial light modulator is arranged on the light emitting side of the four-primary-color super-structure color pixel array. Compared with the prior art, the present application realizes full-colorization by introducing a super-structure surface, which can effectively improve the light filtering performance and provide higher colorization quality; meanwhile, the super-structure surface has the characteristics of ultra-thin planar structure, which can further improve the integration, portability and stability of the device. 2. Compared with the prism synthesis of three primary colors, the RGB full-color and the color conversion method of the prior art, the color pixel of the present application comprises four primary color sub-pixels of different colors, and more basic colors can greatly improve the color reproduction degree in the display device, provide better immersion effect, and overcome the problem of insufficient color reproduction degree in the prior art.

[0019] In summary, the present application can improve the integration, portability and stability of the near-eye display device, provide higher colorization quality of the near-eye display device, and overcome the problem of insufficient color reproduction degree. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure diagram of a bionic full-color near-eye display device based on a super-structure surface provided by an embodiment of the present application;

[0021] Figure 2 is a structure diagram of a super atom provided by an embodiment of the present application;

[0022] Figure 3is a wavelength and transmittance relationship diagram provided by an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of the relationship between duty cycle and color gamut area provided by an embodiment of the present application;

[0024] Figure 5 is a diagram of the relationship between super atom period and its optimal transmittance wavelength provided by an embodiment of the present application;

[0025] Figure 6 is a comparative schematic diagram of the corresponding color gamut of the superstructure surface and the corresponding color gamut of the prior art provided by an embodiment of the present application;

[0026] Figure 7 is a schematic diagram of the relationship between the color gamut area and the transmittance corresponding to different materials provided by an embodiment of the present application;

[0027] Figure 8 is a structural schematic diagram of a color pixel of a four-primary-color superstructure surface structural color pixel array provided by an embodiment of the present application;

[0028] Figure 9 is a route schematic diagram of light in a biomimetic full-color near-eye display device provided by an embodiment of the present application;

[0029] Figure 10 is a structural schematic diagram of a biomimetic full-color near-eye display device based on a superstructure surface in an application process provided by an embodiment of the present application. DETAILED DESCRIPTION

[0030] The present application discloses a biomimetic full-color near-eye display device based on a superstructure surface, and those skilled in the art can refer to the content herein to appropriately improve technical details for implementation. It is particularly important to note that all similar substitutions and changes are obvious to those skilled in the art, and they are considered to be included in the present application. The method and application of the present application have been described by the preferred embodiments, and the relevant personnel can obviously modify or appropriately change and combine the method and application described herein without departing from the content, spirit and scope of the present application, to realize and apply the present application technology.

[0031] The applicant found that, in the face of the challenges in the background art, the superstructure surface born from modern micro-nano technology is considered an important optimization means for near-eye display technology. The superstructure surface is composed of subwavelength superatoms designed by humans, has the advantages of super-high resolution and small size easy to integrate, and is considered a research focus of future integrated micro-nano optics. The superstructure surface structural color is inspired by biological photonic crystals and can achieve selectivity for specific wavelengths through the interaction of light and the designed superstructure surface. Compared with the traditional color conversion method, the superstructure surface structural color has strong environmental stability and can solve the stability problem in the quantum dot / fluorescent powder color conversion method. However, the transmission mode of the superstructure surface structural color cannot achieve narrow half-height width, low sideband and high-quality spectrum color, so it is crucial to design a transmission mode of the superstructure surface structural color that can produce high-quality color.

[0032] At the same time, the applicant also found that the RGB combination color mixing method in the traditional display field cannot restore all colors in nature, such as orange red and the like, which is a serious challenge to the restoration of actual scenes in the near-eye display system. Although the human eye has three types of cone cells that can perceive most colors in nature, there are four-cone cells in some birds that can perceive more colors in nature. In general, animals with four-cone cells can restore and perceive more colors than animals with three-cone cells, and the colors they can perceive are several hundred or even several thousand times more than the latter. Therefore, inspired by four-view animals such as birds, adding other colors that cannot be achieved in addition to the three primary colors can provide better color restoration and differentiation in near-eye display.

[0033] Therefore, the embodiment of the present application provides a kind of based on superstructure surface's bionic full-color near-eye display device, as shown in Figure 1 As shown in the figure, the bionic full-color near-eye display device includes a pixelated white light micro display screen 101, which is arranged on the frame or lens of the bionic full-color near-eye display device. The light emitting surface of the pixelated white light micro display screen 101 is provided with a light collimator 102, and the surface of the light collimator 102 is provided with a four-primary-color superstructure surface structural color pixel array 103. Each color pixel in the four-primary-color superstructure surface structural color pixel array 103 corresponds one-to-one to a white light pixel of the pixelated white light micro display screen 101. The color pixel includes four primary color sub-pixels of different colors. The light emitting side of the four-primary-color superstructure surface structural color pixel array 103 is provided with a spatial light modulator 104.

[0034] The bionic full-color near-eye display device is configured to: in response to a video display signal, the spatial light modulator 104 switches or gray-scale controls each white light pixel in the pixelated white light micro display screen 101 according to the video display signal; each white light pixel of the pixelated white light micro display screen 101 is controlled by the spatial light modulator 104 to emit a non-coherent white light source required by the video display signal; the non-coherent white light source is adjusted in angle by the light collimator 102 and enters the four-primary-color super-structured surface structural color pixel array 103, the four-primary-color super-structured surface structural color pixel array 103 realizes selective transmission of specific wavelength light in the non-coherent white light source through electromagnetic wave resonance, and then the non-coherent white light source of each white light pixel is colored after passing through the corresponding color pixel to obtain color light; the color light enters the spatial light modulator 104 for modulation.

[0035] The four-primary-color super-structured surface structural color pixel array 103 realizes selective transmission of specific color light to achieve the effect of high-quality full-color, the pixelated white light micro display screen 101 provides a high-brightness non-coherent white light source, the non-coherent outgoing white light realizes collimated white light emission through the action of the collimator, and then directly irradiates on the four-primary-color super-structured surface structural color pixel array 103, the color pixels of the four-primary-color super-structured surface structural color pixel array 103 are aligned with each pixel of the pixelated white light micro display screen 101 to realize colorization of a single pixel, and the light enters the eye through the spatial light modulator 104.

[0036] It should be noted that the four-primary-color super-structured surface structural color pixel array 103 in the embodiment of the present application plays a filtering role, and by allowing light of a predetermined wavelength in the non-coherent white light source to pass through and blocking light of other wavelengths, the colorization is realized. Compared with existing filtering technology, the super-structured surface has the following advantages: 1. Improved filtering performance: the super-structured surface can realize precise control of optical wavefront amplitude, phase, polarization and other parameters through its unique sub-wavelength structure design. This ability enables the super-structured surface filter to have a significant improvement in filtering performance compared to traditional filters, and can achieve higher precision and wider band optical filtering. 2. Miniaturization and integration: the super-structured surface has an ultra-thin planar structure characteristic, which can realize miniaturization and integration design. This makes the super-structured surface filter have greater application potential in near-eye display technology, and can meet the needs of near-eye display systems for light, thin, compact and high-performance filters. 3. Customized design: the super-structured surface can be customized according to specific requirements, and by adjusting the structure parameters of the super-structured surface, filters with different wavelengths, bandwidths and transmittances can be realized. This customized design capability makes the super-structured surface filter have greater flexibility and adaptability in near-eye display technology.

[0037] In this specific embodiment, the pixelated white light micro display screen 101 at least includes one of a Micro-LED display screen, a Micro-OLED display screen, a Micro-QLED display screen, and an LCoS display screen; wherein each white light pixel of the pixelated white light micro display screen 101 has a separate adjustment switch and a bright-dark function.

[0038] It should be noted that each white light pixel of the pixelated white light micro display screen 101 is controlled by the spatial light modulator 104. Compared with a general backlight source, each white light pixel of the pixelated white light micro display screen 101 of the embodiment of the present application can be controlled individually, so that the colorization is more delicate, and the imaging quality of the near-eye device is improved.

[0039] In this specific embodiment, the light collimator 102 at least includes one of a prism grating light collimator, a micro-nano structure grating light collimator, and a super-structured surface light collimator.

[0040] It should be noted that the light collimator 102 can directly collimate the incident incoherent white light. The near-eye display device of the embodiment of the present application directly provides a shaped information light source by the pixelated white light micro display screen 101 and the light collimator 102, without the need for integrating a waveguide. In this way, the integration of the near-eye display device can be further realized.

[0041] It is worth mentioning that the light collimator 102 collimates the incident light. The prism grating light collimator, the micro-nano structure grating light collimator, and the super-structured surface light collimator can all realize the collimation function. The prism grating light collimator has a simple structure, and the micro-nano structure grating light collimator and the super-structured surface light collimator have the unique advantages of being easy to integrate and realizing an ultra-thin display device.

[0042] In this specific embodiment, the spatial light modulator 104 at least includes one of a transmissive light modulator and a reflective light modulator.

[0043] It should be noted that the principle of the transmissive light modulator is that the transmissive light modulator adopts a thin film transistor (TFT) electrically addressed liquid crystal display mode (TFT-LCD). The internal integrated part of the liquid crystal panel drives the circuit, so that the driving mode is more stable and reliable. The advantage is that the optical path does not need to be changed in the optical path design, and the use is simple. The principle of the reflective light modulator is that the reflective light modulator adopts a liquid crystal on silicon display mode (LCoS-LCD). After the laser is incident on the liquid crystal light valve working surface, the precise Pixelto Pixel control capability can change the twist direction of the liquid crystal molecules according to the user requirements to control the phase of the reflected light. The advantage is that a high reflection film can be plated to make the light reflectivity higher, the effective pixel area ratio higher, the light energy loss smaller, and the light intensity contrast higher.

[0044] In this embodiment, the spatial light modulator 104 includes a display panel, a driving circuit, a control system, etc. The spatial light modulator 104 contains a plurality of individual pixels, which are uniformly distributed on the spatial light modulator 104, and each individual pixel contains a plurality of sub-pixels. The light passing through the display panel carries image information, which needs to be fed back to each pixel in the pixelated white light micro display 101.

[0045] In this embodiment, the color pixels of the four-primary-color metasurface structural color pixel array 103 are composed of a plurality of super-atoms, the width of the super-atom is w, the spacing between the super-atoms is d, the period of the super-atom is p=(w+d), and the duty cycle of the super-atom is k=w / (w+d).

[0046] Wherein, the larger the k is, the lower the sideband generated is, the higher the color purity corresponding to the color pixel is, but the peak value is also limited, the k can be selected in the range of 0.8-0.83, the period p of a single super-atom increases, and the entire color will be red-shifted.

[0047] In this embodiment, the super-atom is a one-dimensional grating, the length of the one-dimensional grating is 0.5um-50um, the length and width of the nanometer column are equal, and the one-dimensional grating structure has a polarization selection effect.

[0048] Further, the length of the one-dimensional grating is 10um-20um.

[0049] In another embodiment, the super-atom is a two-dimensional nanometer column, and the two-dimensional nanometer column has polarization insensitivity.

[0050] In this embodiment, the structure of the super-atom is vertically stacked from top to bottom by aluminum-dielectric material-silver-aluminum oxide on a silicon dioxide substrate, the thicknesses of the silver, the dielectric material and the aluminum are all 20nm, and the thickness of the aluminum oxide is 200nm.

[0051] Further, the super-atom is constructed as shown in Figure 2 On the silicon dioxide substrate 1035, the constructed super-atom is vertically stacked from top to bottom by aluminum 1031-dielectric material 1032-silver 1033-aluminum oxide 1034, the thicknesses of the silver 1033, the dielectric material 1032 and the aluminum 1031 are all 20nm, and the thickness of the aluminum oxide 1034 is 200nm. Figure 2 Wherein, W is the width of the silver 1033, the dielectric material 1032, the aluminum 1031 and the aluminum oxide 1034, H TPM is the thickness of the aluminum 1031, H DRI is the thickness of the dielectric material 1032, H BPM is the thickness of the silver 1033, HWG For the thickness of the aluminum oxide 1034, P is the width of the silicon dioxide substrate 1035.

[0052] The width of the superatom is w, the distance between superatoms is d, the period of the superatom is p=(w+d), the larger the duty cycle k=w / (w+d) of the superatom, the lower the sideband generated, and the higher the color purity corresponding to the color pixel, as shown in Figure 3 and Figure 4 , wherein the abscissa represents the wavelength and the ordinate represents the infrared transmission coefficient, and the different curves in the figure represent different duty cycles. The larger the duty cycle, the larger the infrared transmission coefficient, i.e. the center of the transmission peak is red-shifted. Figure 3 Figure 4 , wherein the abscissa represents the duty cycle and the ordinate represents the color gamut area. According to Figure 3 and Figure 4 , it can be seen that as the duty cycle k increases from 0.5 to 1 (thin film stacking), the center of the transmission peak is red-shifted, and at the same time, as the duty cycle k continues to increase, the suppression of the sideband is also more obvious, so the four-primary-color super-structured surface structural color pixel array 103 is most suitable when the duty cycle k is about 0.8. When k is greater than 0.8, the transmission peak value is significantly reduced. When the duty cycle k increases from 0.8 to 0.83, the color gamut area increases from 0.184 to 0.194, and the duty cycle k can be selected in the range of 0.8-0.83.

[0053] The period p of a single superatom increases, and the entire color of the transmitted light is red-shifted, as shown in Figure 5 and Figure 6 , wherein the abscissa represents the wavelength and the ordinate represents the transmission rate, and the different periods p and wavelength peaks can be seen. When the period is 270nm, the transmitted light is high-purity blue light, when the period is 280nm, it is cyan blue, when the period is 290nm, it is cyan, when the period is 300nm-330nm, it is cyan green, when the period is 340nm, it is green, when the period is 350nm, it is yellow, when the period is 360-370nm, it is orange, and when the period is 380nm-400nm, it is red, but when the period is 400nm, the red purity is the highest. Figure 6 Figure 5

[0054] ​​​The dielectric material corresponding to the dielectric layer in the single superatom (i.e., the layer level of the dielectric material mentioned above) can be a lossless material with a refractive index of 1.37-2.1, such as Figure 7 As shown in the figure, the abscissa n is the refractive index of the material, the left ordinate is the color gamut area, and the right ordinate is the transmittance peak. In the four-primary-color super-structured surface structural color pixel array 103 proposed in the embodiment of the present application, when different refractive index materials are used for the dielectric layer, the maximum color gamut area that can be achieved under different periods is also different. When magnesium fluoride (MgF2) with a refractive index of 1.37 is used, the color gamut area is 0.168; when silicon dioxide (SiO2) with a refractive index of 1.48 is used, the color gamut area is 0.173; when aluminum oxide (Al2O3) with a refractive index of 1.69 is used, the color gamut area is 0.194; when hafnium oxide (HfO2) with a refractive index of 1.9 is used, the color gamut area is 0.191; and when silicon nitride (Si3N4) with a refractive index of 2 is used, the color gamut area is 0.187. The embodiment of the present application compares the transmittance peak values that can be achieved by RGB three colors when different refractive index materials are used for the dielectric layer, Figure 7 The circle point represents the transmittance peak of blue light, and when magnesium fluoride with a refractive index of 1.37 is used, the transmittance peak of blue light is 0.44; when silicon dioxide with a refractive index of 1.48 is used, the transmittance peak of blue light is 0.45; when aluminum oxide with a refractive index of 1.69 is used, the transmittance peak of blue light is 0.47; when hafnium oxide with a refractive index of 1.9 is used, the transmittance peak of blue light is 0.42; and when silicon nitride with a refractive index of 2 is used, the transmittance peak of blue light is 0.41. The triangular point represents the transmittance peak of green light, and when magnesium fluoride with a refractive index of 1.37 is used, the transmittance peak of green light is 0.52; when silicon dioxide with a refractive index of 1.48 is used, the transmittance peak of green light is 0.54; when aluminum oxide with a refractive index of 1.69 is used, the transmittance peak of green light is 0.56; when hafnium oxide with a refractive index of 1.9 is used, the transmittance peak of green light is 0.54; and when silicon nitride with a refractive index of 2 is used, the transmittance peak of green light is 0.56. The square point represents the transmittance peak of red light, and when magnesium fluoride with a refractive index of 1.37 is used, the transmittance peak of red light is 0.67; when silicon dioxide with a refractive index of 1.48 is used, the transmittance peak of red light is 0.7; when aluminum oxide with a refractive index of 1.69 is used, the transmittance peak of red light is 0.73; when hafnium oxide with a refractive index of 1.9 is used, the transmittance peak of red light is 0.71; and when silicon nitride with a refractive index of 2 is used, the transmittance peak of red light is 0.68.

[0055] The four-primary-color super-structured surface structural color pixel array 103 proposed in the embodiment of the present application is composed of red, green, blue, and yellow four primary color sub-pixels as shown in the figure Figure 8As shown in the diagram, pixel 1036 is a blue pixel with a period p of 270nm, and the size of a single primary color sub-pixel is 10-20µm. Pixel 1037 is a green pixel with a period p of 340nm, and the size of a single primary color sub-pixel is 10-20µm. Pixel 1038 is a yellow pixel with a period p of 350nm, and the size of a single primary color sub-pixel is 10-20µm. Pixel 1039 is a red pixel with a period p of 400nm, and the size of a single primary color sub-pixel is 10-20µm. For a better and more uniform display effect, the four primary color sub-pixels 1036, 1037, 1038, and 1039 should have the same size.

[0056] To more clearly illustrate the overall device structure, the embodiments of the present invention simplify the structure as follows: Figure 9 The simplified model shown is shown. Figure 9 In the process, light is generated by a pixelated white light microdisplay 101 and passes sequentially through a light collimator 102, a four-primary-color metasurface structured color pixel array 103, and a spatial light modulator 104 before entering the human eye.

[0057] This invention provides preferred embodiments, but should not be considered as limited to the embodiments set forth herein. In the figures, the thickness of layers and regions is magnified for clarity, but as a schematic diagram, it should not be considered as strictly reflecting the proportional relationships of geometric dimensions.

[0058] In a specific application process, such as Figure 10 As shown, the pixelated white light micro-display 101 is a pixelated white light Micro-led back panel, the light collimator 102 is a metasurface light collimator 102, the four primary color metasurface structure color pixel array 103 uses a duty cycle k of 0.83, the dielectric material is aluminum oxide with a refractive index of 1.69, and the spatial light modulator 104 is a transmissive light modulator. Figure 10 The diagram illustrates a specific structure of a four-primary-color metasurface structured color pixel array 103.

[0059] The spatial light modulator 104 identifies and decomposes the color signal in a single pixel of the input video signal to adjust the grayscale or on / off state of each white light sub-pixel. The color light, after being modulated by the structured tone, is then modulated by the spatial light modulator 104 and directly illuminates the human eye to achieve a waveguide-free, high-color-fidelity VR near-eye display.

[0060] The bionic full-color near-eye display device of the embodiment of the present application comprises: a pixelated white light micro display screen 101, which is arranged on a frame or lens of the bionic full-color near-eye display device; a light collimator 102 is arranged on a light-emitting side of the pixelated white light micro display screen 101; a four-primary-color super-structure color pixel array 103 is arranged on the surface of the light collimator 102; each color pixel in the four-primary-color super-structure color pixel array 103 corresponds to a white light pixel of the pixelated white light micro display screen 101 through the light collimator 102; the color pixel comprises four primary color sub-pixels of different colors; and a spatial light modulator 104 is arranged on a light-emitting side of the four-primary-color super-structure color pixel array 103. Compared with the prior art, the embodiment of the present application realizes full-colorization by introducing a super-structure surface structure, can effectively improve the light filtering performance, and makes the colorization quality higher; meanwhile, the super-structure surface has the characteristics of an ultrathin planar structure, and can further improve the integration, portability and stability of the device.

[0061] Compared with the prism synthesis of the prior art three primary colors, RGB full color and color conversion method, the color pixel of the embodiment of the present application comprises four primary color sub-pixels of different colors, more basic colors can greatly improve the color reproduction degree in the display device, provide better immersion effect, and overcome the problem of insufficient color reproduction degree in the prior art.

[0062] In summary, the embodiment of the present application can improve the integration, portability and stability of the near-eye display device, make the colorization quality of the near-eye display device higher, and overcome the problem of insufficient display color reproduction degree.

[0063] It should be noted that, in this document, the relationship terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0064] Each embodiment in the specification is described in a relevant manner, and the same and similar parts between each embodiment can be referred to each other, and each embodiment mainly explains the difference from other embodiments. Especially, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0065] The above merely provides the preferred embodiments of the application, and not intended to limit the protection scope of the application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall fall within the protection scope of the application.

Claims

1. A biomimetic full-color near-eye display device based on a metasurface, characterized in that, The bionic full-color near-eye display device includes: a pixelated white light microdisplay, which is disposed on the frame or lens of the bionic full-color near-eye display device; a light collimator is disposed on one side of the light-emitting surface of the pixelated white light microdisplay; a four-primary-color metasurface structure color pixel array is disposed on the surface of the light collimator; each color pixel in the four-primary-color metasurface structure color pixel array corresponds one-to-one with the white light pixel of the pixelated white light microdisplay; and each color pixel includes four primary color sub-pixels of different colors; a spatial light modulator is disposed on the light-emitting side of the four-primary-color metasurface structure color pixel array. The bionic full-color near-eye display device is configured as follows: In response to a video display signal, the spatial light modulator switches or adjusts the grayscale of each white light pixel in the pixelated white light microdisplay according to the video display signal; each white light pixel of the pixelated white light microdisplay emits an incoherent white light source corresponding to the video display signal under the control of the spatial light modulator; the incoherent white light source enters the four-primary-color metasurface structure color pixel array after the angle is adjusted by the light collimator; the four-primary-color metasurface structure color pixel array achieves selective transmission of specific wavelengths of light in the incoherent white light source through electromagnetic wave resonance, thereby enabling the incoherent white light source of each white light pixel to be colored after passing through the corresponding color pixel to obtain colored light; the colored light enters the spatial light modulator for modulation. In this array, the color pixels of the four-primary-color metasurface structure color pixel array are composed of multiple superatoms. The width of each superatom is w, the spacing between the superatoms is d, the period of each superatom is p = (w + d), and the duty cycle of each superatom is k = w / (w + d). The larger k is, the lower the sidebands are generated, and the higher the color purity of the color pixel. However, the peak value is also limited. The selectable range of k is 0.8-0.

83. Increasing the period p of a single superatom will cause a redshift in the entire color. The superatomic structure is based on silicon dioxide as a substrate, with aluminum, dielectric material, silver, and aluminum oxide stacked vertically from top to bottom. The thickness of the silver, dielectric material, and aluminum is 20 nm, and the thickness of the aluminum oxide is 200 nm.

2. The biomimetic full-color near-eye display device based on metasurface according to claim 1, characterized in that, The pixelated white light microdisplay includes at least one of the following: Micro-LED display, Micro-OLED display, Micro-QLED display, and LCoS display; wherein each white light pixel of the pixelated white light microdisplay has an individual adjustment switch and brightness / darkness function.

3. The biomimetic full-color near-eye display device based on metasurface according to claim 1, characterized in that, The light collimator includes at least one of the following: a prism grating light collimator, a micro / nano structure grating light collimator, and a metasurface light collimator.

4. The biomimetic full-color near-eye display device based on metasurface according to claim 1, characterized in that, The spatial light modulator includes at least one of the following: a transmissive light modulator and a reflective light modulator.

5. The biomimetic full-color near-eye display device based on metasurface according to claim 1, characterized in that, The superatoms are one-dimensional gratings with a length of 0.5µm-50µm. The nanopillars have equal length and width, and the one-dimensional grating structure has a polarization selection effect.

6. The biomimetic full-color near-eye display device based on metasurface according to claim 1, characterized in that, The superatom is a two-dimensional nanopillar, which is polarization insensitive.

7. The biomimetic full-color near-eye display device based on metasurface according to claim 1, characterized in that, The primary color sub-pixel size is 1-50µm, and the dielectric material of the superatoms is a lossless material with a refractive index of 1.37-3.

8. The biomimetic full-color near-eye display device based on metasurface according to claim 1, characterized in that, Each of the color pixels is composed of four primary color sub-pixels: red, green, blue, and yellow. The periods p of the superatoms corresponding to the four primary color sub-pixels are 400nm, 340nm, 270nm, and 350nm, respectively.

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