Anamorphic color separation device and near-eye display optical engine and apparatuses

Abstract

The present application relates to a kind of special color separation device and near-eye display light machine and its equipment, it can improve, even avoid the color uneven phenomenon that diffraction waveguide appears when transmitting image.The special color separation device includes prism group and at least two anti-reflection film systems.The prism group has a polychromatic incident surface for corresponding with the light source and three monochromatic exit surfaces for respectively corresponding with the three monochromatic coupling entrances of the diffraction waveguide.The at least two anti-reflection film systems are correspondingly arranged in the prism group to form three monochromatic light paths between the polychromatic incident surface and the three monochromatic exit surfaces, wherein the at least two anti-reflection film systems are respectively used to reflect light of predetermined color and transmit light of other colors, so that one light emitted by the light source is first divided into three monochromatic lights by the anti-reflection of the corresponding anti-reflection film system after being incident from the polychromatic incident surface, and then transmitted to the three monochromatic coupling entrances of the diffraction waveguide along the corresponding monochromatic light paths respectively.

Description

Technical Field

[0001] This invention relates to the field of micro-display technology, and in particular to an irregularly shaped color separation device and a near-eye display optical engine and related equipment. Background Technology

[0002] In recent years, with the increasing maturity and development of new display technologies, more and more small portable projection media players, projection mobile phones or wearable display devices (such as AR glasses) have been launched, making their application modes more diversified and their development prospects highly anticipated.

[0003] In the field of micro-display full-color AR solutions, optical waveguide display technology has attracted much attention because it is closest to the shape of glasses and can provide users with a good experience. In particular, diffractive optical waveguides have the potential for large-scale mass production due to their advantages in cost and process feasibility. Therefore, it stands out among various AR display technologies and is highly regarded and researched.

[0004] Existing optical-mechanical systems combined with diffractive waveguides typically involve multicolor light entering the waveguide through a single coupling entrance and exiting through a single coupling exit to reach the human eye. However, due to the dispersion effect of waveguide diffractive optical surfaces on the light propagating within the waveguide, images transmitted through the waveguide exhibit significant color inhomogeneity and other defects. Therefore, existing solutions using diffractive waveguides cannot provide users with uniformly colored images and fail to meet the high-quality requirements for near-eye displays. Summary of the Invention

[0005] One advantage of this invention is that it provides an irregularly shaped color separation device and a near-eye display optical engine and device thereof, which can improve or even avoid the color inhomogeneity that occurs when a diffractive waveguide transmits an image.

[0006] Another advantage of the present invention is that it provides an irregularly shaped color separation device and a near-eye display optical engine and device thereof. In one embodiment of the present invention, the irregularly shaped color separation device can perform color separation based on the optical engine output image light of various display chips, so that the image light of different colors is independently coupled in to perform discrete transmission of each color image light, which helps to improve the color uniformity of the transmitted image.

[0007] Another advantage of the present invention is that it provides an irregularly shaped color separation device and a near-eye display optical engine and device thereof. In one embodiment of the present invention, the irregularly shaped color separation device can keep the optical path of image light of different colors consistent, so as to ensure good imaging quality while realizing the function of multi-color light separation.

[0008] Another advantage of the present invention is that it provides an irregularly shaped color separation device and a near-eye display optical engine and device thereof. In one embodiment of the present invention, the irregularly shaped color separation device enables the back focal length and optical path of the imaging lens in the three light paths to be equal, thereby realizing that the output light of one optical engine is coupled into the waveguide from the discrete monochromatic coupling entrance for color separation transmission. This helps to solve the problem of color inhomogeneity in the transmission of images by existing diffraction waveguides, while ensuring the consistency of imaging quality and magnification of each light path.

[0009] Another advantage of this invention is that it provides an irregularly shaped color separation device and a near-eye display optical engine and apparatus thereof, wherein, to achieve the above-mentioned objectives, expensive materials or complex structures are not required. Therefore, this invention successfully and effectively provides a solution that not only provides a simple irregularly shaped color separation device and a near-eye display optical engine and apparatus thereof, but also increases the practicality and reliability of the irregularly shaped color separation device and the near-eye display optical engine and apparatus thereof.

[0010] To achieve at least one of the above-mentioned advantages or other benefits and objectives of the present invention, the present invention provides an irregularly shaped color separation device for being correspondingly disposed in an optical path between a light source and a diffraction waveguide, the irregularly shaped color separation device comprising:

[0011] A prism assembly, wherein the prism assembly has a multicolor incident surface corresponding to the light source and three monochromatic exit surfaces corresponding one-to-one with the three monochromatic coupling entrances of the diffraction waveguide; and

[0012] At least two anti-transmission film systems are correspondingly disposed on the prism group to form three monochromatic light paths between the multicolor incident surface and the three monochromatic exit surfaces. The at least two anti-transmission film systems are respectively used to reflect light of a predetermined color and transmit light of other colors, such that a light emitted from the light source, after entering from the multicolor incident surface, is first separated into three monochromatic lights by the reflection of the corresponding anti-transmission film system, and then transmitted to the three monochromatic coupling entrances of the diffraction waveguide along the corresponding monochromatic light paths.

[0013] According to one embodiment of this application, the at least two reverse osmosis membrane systems are two reverse osmosis membrane systems, and the two reverse osmosis membrane systems are arranged in a cross-shaped manner on the prism assembly.

[0014] According to one embodiment of this application, the irregular color separation device consists of a color combining prism and two total internal reflection prisms, and the two total internal reflection prisms are symmetrically arranged on opposite sides of the color combining prism.

[0015] According to one embodiment of this application, the at least two anti-transmission film systems are three anti-transmission film systems, wherein the three anti-transmission film systems are arranged intersectingly in the prism group to form three monochromatic light paths with equal optical path lengths between the multicolor incident surface and the three monochromatic exit surfaces of the prism group.

[0016] According to one embodiment of this application, the prism assembly further provides three beam-splitting functional surfaces for attaching the three anti-transmission film systems and three total reflection surfaces for bending the three monochromatic light paths by total internal reflection, wherein the multicolor incident surface is parallel to the three monochromatic exit surface, and the three beam-splitting functional surfaces are respectively parallel to the three total reflection surfaces.

[0017] According to one embodiment of this application, the prism assembly includes a cuboid composed of six basic prisms and three directional prisms, wherein the cuboid provides the multicolor incident surface and the three intersecting beam-splitting functional surfaces, and the three anti-reflection films are attached or coated on the three beam-splitting functional surfaces in a corresponding manner, wherein the three directional prisms are correspondingly disposed on the side of the cuboid to provide the three total reflection surfaces and the three monochromatic emission surfaces located on the same plane.

[0018] According to one embodiment of this application, the angle between the three reverse-transparency membrane systems and the multicolor incident surface is 45°.

[0019] According to one embodiment of this application, the prism assembly further provides three beam-splitting functional surfaces for attaching the three anti-reflection film systems, three total reflection surfaces for bending the three monochromatic light paths by total internal reflection, and a multicolor display surface corresponding to the display chip. The multicolor display surface is parallel to the three monochromatic emission surfaces, and the three beam-splitting functional surfaces are respectively parallel to the three total reflection surfaces. The multicolor display surface is parallel to the multicolor incident surface, and the three anti-reflection film systems are respectively used to reflect polarized light having the predetermined color and first polarization state, and transmit light of other colors.

[0020] According to one embodiment of this application, the multicolor incident surface of the prism group and the three monochromatic exit surfaces are on the same plane.

[0021] According to one embodiment of this application, the three monochromatic lights are red light, green light, and blue light, respectively.

[0022] According to another aspect of this application, this application further provides a near-eye display device, comprising:

[0023] A light source, wherein the light source is used to emit a single beam of light;

[0024] A diffractive waveguide, wherein the diffractive waveguide has three discrete monochromatic coupling entrances; and

[0025] An irregularly shaped color separation device, wherein the irregularly shaped color separation device is correspondingly disposed in the optical path between the light source and the diffraction waveguide, and the irregularly shaped color separation device comprises:

[0026] A prism assembly, wherein the prism assembly has a multicolor incident surface corresponding to the light source and three monochromatic exit surfaces corresponding one-to-one with the three monochromatic coupling entrances of the diffraction waveguide; and

[0027] At least two anti-transmission film systems are correspondingly disposed on the prism group to form three monochromatic light paths between the multicolor incident surface and the three monochromatic exit surfaces. The at least two anti-transmission film systems are respectively used to reflect light of a predetermined color and transmit light of other colors, such that the light emitted by the light source, after entering from the multicolor incident surface, is first separated into three monochromatic lights by the reflection of the corresponding anti-transmission film system, and then transmitted to the three monochromatic coupling entrances of the diffraction waveguide along the corresponding monochromatic light paths.

[0028] According to one embodiment of this application, the light source is an illumination light source, and the near-eye display device further includes a display chip correspondingly disposed in the optical path between the illumination light source and the diffraction waveguide, for modulating the illumination light emitted via the illumination light source into corresponding image light.

[0029] According to one embodiment of this application, the display chip is three LCD chips, and the three LCD chips are respectively disposed between the three monochromatic emission surfaces of the irregular color separation device and the three monochromatic coupling entrances of the diffraction waveguide, for correspondingly modulating the three monochromatic illumination lights emitted from the three monochromatic emission surfaces into three monochromatic image lights, so as to couple into the diffraction waveguide from the three monochromatic coupling entrances respectively.

[0030] According to one embodiment of this application, the display chip is an LCD chip, wherein the LCD chip is correspondingly disposed between the multicolor incident surface of the irregular color separation device and the illumination source, for first modulating the multicolor illumination light emitted by the illumination source into multicolor image light, and then shining it into the irregular color separation device from the multicolor incident surface for color separation.

[0031] According to one embodiment of this application, the display chip is a DMD chip, and the DMD chip is correspondingly disposed in the optical path between the multicolor incident surface of the irregular color separation device and the illumination source, wherein the near-eye display device further includes a TIR prism or an RTIR prism, and the TIR prism or the RTIR prism is disposed between the illumination source, the DMD chip and the multicolor incident surface of the irregular color separation device.

[0032] According to one embodiment of this application, the display chip is an LCoS chip, and the LCoS chip is correspondingly disposed in the optical path between the multicolor incident surface of the irregular color separation device and the illumination source, wherein the near-eye display device further includes a polarizing beam splitter, and the polarizing beam splitter is disposed between the illumination source, the LCoS chip and the multicolor incident surface of the irregular color separation device.

[0033] According to one embodiment of this application, the display chip is an LCoS chip, and the illumination source and the LCoS chip are correspondingly disposed on opposite sides of the irregular color separation device, wherein the at least two anti-reflection film systems are three anti-reflection film systems, and the three reflective film systems are respectively used to reflect polarized light having the predetermined color and the first polarization state, and transmit light of other colors.

[0034] According to one embodiment of this application, the light source is an image light source, and the image light source is a full-color MicroLED.

[0035] According to one embodiment of this application, the near-eye display device further includes three projection lenses, and the three projection lenses are respectively disposed in the optical path between the three monochromatic emission surfaces of the irregular color separation device and the three monochromatic coupling entrances of the diffraction waveguide.

[0036] According to another aspect of this application, this application further provides a near-eye display optical engine for providing three monochromatic image lights for a diffraction waveguide, the near-eye display optical engine comprising:

[0037] A light source, wherein the light source is used to emit a single beam of light; and

[0038] An irregularly shaped color separation device, wherein the irregularly shaped color separation device is correspondingly disposed on the light-emitting side of the light source, for being located in the optical path between the light source and the diffraction waveguide, and the irregularly shaped color separation device includes:

[0039] A prism assembly, wherein the prism assembly has a multicolor incident surface corresponding to the light source and three monochromatic exit surfaces corresponding one-to-one with the three monochromatic coupling entrances of the diffraction waveguide; and

[0040] At least two anti-transmitting film systems are correspondingly disposed on the prism group to form three monochromatic light paths between the multicolor incident surface and the three monochromatic exit surfaces. The at least two anti-transmitting film systems are respectively used to reflect light of a predetermined color and transmit light of other colors, such that the light emitted by the light source, after entering from the multicolor incident surface, is first separated into three monochromatic lights by the reflection of the corresponding anti-transmitting film system, and then transmitted to the three monochromatic coupling entrances of the diffraction waveguide along the corresponding monochromatic light paths. Attached Figure Description

[0041] Figure 1 This is a three-dimensional schematic diagram of the irregularly shaped color separation device according to the first embodiment of the present invention;

[0042] Figure 2 An exploded view of the irregularly shaped color separation device according to the first embodiment of the present invention is shown;

[0043] Figure 3 A first application example of the irregularly shaped color separation device according to the first embodiment of the present invention is shown;

[0044] Figure 4 A second application example of the irregularly shaped color separation device according to the first embodiment of the present invention is shown;

[0045] Figure 5 A third application example of the irregularly shaped color separation device according to the first embodiment of the present invention is shown;

[0046] Figure 6 and Figure 7 This is a three-dimensional schematic diagram of an irregularly shaped color separation device according to a second embodiment of the present invention;

[0047] Figure 8 and Figure 9 A cross-sectional schematic diagram of the irregular color separation device according to the second embodiment of the present invention is shown;

[0048] Figure 10 An exploded view of the irregularly shaped color separation device according to the second embodiment of the present invention is shown;

[0049] Figure 11 and Figure 12 A first application example of the irregularly shaped color separation device according to the second embodiment of the present invention is shown;

[0050] Figure 13 A second application example of the irregularly shaped color separation device according to the second embodiment of the present invention is shown;

[0051] Figure 14A third application example of the irregular color separation device according to the second embodiment of the present invention is shown;

[0052] Figure 15 A fourth application example of the irregular color separation device according to the second embodiment of the present invention is shown;

[0053] Figure 16 A fifth application example of the irregular color separation device according to the second embodiment of the present invention is shown;

[0054] Figure 17 This is a schematic diagram illustrating the application of the irregularly shaped color separation device according to the third embodiment of the present invention;

[0055] Figure 18 This is a block diagram of a near-eye display optical engine according to an embodiment of the present invention.

[0056] Key component symbols: 1. Near-eye display device; 10. Irregularly shaped color separation device; 100. Monochromatic light path; 11. Prism assembly; 101. Color combining prism; 102. Total internal reflection prism; 1101. Multicolor incident surface; 1102. Monochromatic exit surface; 1103. Beam splitting functional surface; 1104. Total internal reflection surface; 1105. Multicolor display surface; 111. Cuboid; 112. Steering prism; 12. Reflective coating system; 20. Light source; 21. Illumination source; 211. Light-emitting element; 2111. White light emitting element. Optical element; 2112, Monochromatic light-emitting element; 212, Light-collecting and homogenizing system; 2121, Collimating lens; 2122, Lens group; 2123, Compound eye device; 2124, Color combining device; 22, Image light source; 30, Diffraction waveguide; 300, Monochromatic coupling entrance; 40, Display chip; 41, LCD chip; 42, DMD chip; 43, LCoS chip; 50, Projection lens; 60, Polarizing element; 70, TIR prism; 80, RTIR prism; 90, Polarizing beam splitter.

[0057] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0058] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0061] Considering the current problem of poor color uniformity in the display effect of diffractive waveguides, this application improves the coupling entrance of the diffractive waveguide from the original single multicolor coupling entrance to three discrete monochromatic coupling entrances, and allows the light to be effectively separated before being coupled into the waveguide. The three monochromatic lights after separation enter the corresponding transmission layer of the waveguide through the three corresponding monochromatic coupling entrances for transmission, and then exit through the corresponding coupling exits to enter the human eye. This helps to improve or even avoid the color non-uniformity phenomenon that occurs when diffractive waveguides transmit images.

[0062] Reference Appendix Figures 1 to 3 As shown, the first embodiment of the present invention provides an irregularly shaped color separation device 10, which is adapted to be correspondingly disposed in the optical path between the light source 20 and the diffraction waveguide 30 to form a near-eye display device 1, such that one light emitted from the light source 20 is first separated into three monochromatic lights by the irregularly shaped color separation device 10, and then these three monochromatic lights are respectively transmitted into the waveguide through three separate monochromatic coupling entrances 300 on the diffraction waveguide 30 to be transmitted to the human eye.

[0063] Specifically, such as Figures 1 to 3As shown, the irregularly shaped color separation device 10 may include a prism group 11 and two anti-transmitting film systems 12. The prism group 11 has a multicolor incident surface 1101 corresponding to the light source 20 and three monochromatic exit surfaces 1102 respectively corresponding to the three monochromatic coupling entrances 300 of the diffraction waveguide 30. The two anti-transmitting film systems 12 are correspondingly disposed on the prism group 11 to form three monochromatic light paths 100 between the multicolor incident surface 1101 and the monochromatic exit surfaces 1102. The two anti-reflective film systems 12 are respectively used to reflect light of a predetermined color and transmit light of other colors, so that the light emitted by the light source 20, after entering from the multicolor incident surface 1101, is first separated into three monochromatic lights by the anti-reflective film system 12, and then transmitted along the corresponding monochromatic light paths 100, so as to exit from the three monochromatic exit surfaces 1102 to the three monochromatic coupling entrances 300 of the diffraction waveguide 30.

[0064] It is worth noting that the light emitted by the light source 20 mentioned in this application can be, but is not limited to, white light or RGB composite light. Correspondingly, the three monochromatic lights can be implemented as three primary color lights, namely R light (i.e., red light), G light (i.e., green light), and B light (i.e., blue light). Of course, in other examples of this application, the monochromatic light mentioned in this application can be implemented as light beams of other colors, as long as a full-color image can be displayed, which will not be elaborated further in this application.

[0065] For example, the two anti-transmittance film systems 12 may include, but are not limited to, a red light reflecting film system and a blue light reflecting film system, wherein the red light reflecting film system is used to reflect red light and transmit green and blue light; and the blue light reflecting film system is used to reflect blue light and transmit green and red light.

[0066] In addition, such as Figure 3As shown, the light source 20 of this application can be, but is not limited to, an illumination source 21 capable of providing the required illumination light, such as an LED light source. To form a complete near-eye display system, the near-eye display device 1 typically also includes a display chip 40, which is correspondingly disposed in the optical path between the illumination source 21 and the diffraction waveguide 30, for modulating the illumination light emitted via the illumination source 21 into image light; that is, the display chip 40 can be correspondingly disposed between the irregular color separation device 10 and the illumination source 21, such that the illumination light emitted via the illumination source 21 is first modulated by the display chip 40. The light emitted from the illumination source 21 is first divided into three monochromatic light beams by the irregularly shaped color separation device 10, and then modulated into three monochromatic image lights by the display chip 40, so as to achieve full-color display. Alternatively, the light can be positioned between the irregularly shaped color separation device 10 and the diffraction waveguide 30, so that the multicolor illumination light emitted from the illumination source 21 is first divided into three monochromatic illumination lights by the irregularly shaped color separation device 10, and then modulated into three monochromatic image lights by the display chip 40, so as to achieve full-color display.

[0067] For example, such as Figure 3 As shown in the first application example of this application, the display chip 40 of the near-eye display device 1 is implemented as three LCD chips 41, and the three LCD chips 41 are respectively disposed between the three monochromatic emission surfaces 1102 of the prism group 11 of the irregular color separation device 10 and the three monochromatic coupling entrances 300 of the diffraction waveguide 30, for correspondingly modulating the three monochromatic illumination lights emitted from the three monochromatic emission surfaces 1102 into three monochromatic image lights, so as to couple into the diffraction waveguide 30 from the three monochromatic coupling entrances 300 and transmit to the human eye.

[0068] Preferably, such as Figure 1 and Figure 3As shown, the irregularly shaped color-separating device 10 consists of a color-combining prism 101 (i.e., X-CUBE) and two total internal reflection prisms 102. The two total internal reflection prisms 102 are symmetrically arranged on opposite sides of the color-combining prism 101, so that the color-combining prism 101 provides one multi-color incident surface 1101 and one monochromatic exit surface 1102, and the two total internal reflection prisms 102 each provide one monochromatic exit surface 1102. In other words, the color-combining prism 101 in the irregularly shaped color-separating device 10 can provide two beam-splitting functional surfaces 1103 for attaching two anti-transmission film systems 12, and the two total internal reflection prisms 102 can provide two total internal reflection surfaces 1104 for totally reflecting and bending two monochromatic light paths 100, with the remaining monochromatic light path 100 passing through the color-combining prism 101. It is understood that the color-combining prism 101 mentioned in this application consists of four right-angle prisms and two anti-transparency film systems 12, wherein the four right-angle prisms are combined into a cuboid with right-angled faces facing each other, and the two anti-transparency film systems 12 are arranged in a cross shape on the right-angled faces of the four right-angle prisms.

[0069] More preferably, the monochromatic emission surface 1102 provided by the color combining prism 101 and the two monochromatic emission surfaces 1102 provided by the two total internal reflection prisms 102 are located on the same plane, which helps to correspondingly arrange the three LCD chips 41 on the three monochromatic emission surfaces 1102 of the irregular color separation device 10, so that the imaging optical path of the monochromatic image light modulated by the three LCD chips 41 remains consistent.

[0070] It is worth noting that, such as Figure 3 As shown, the near-eye display device 1 according to the first embodiment of this application may further include three projection lenses 50, wherein the three projection lenses 50 are respectively disposed in the optical path between the three monochromatic emission surfaces 1102 of the irregular color separation device 10 and the three monochromatic coupling entrances 300 of the diffraction waveguide 30, for imaging the light emitted from the three monochromatic emission surfaces 1102 respectively, so as to project it onto the corresponding three monochromatic coupling entrances 300.

[0071] Preferably, in the first application example of this application, the three projection lenses 50 are respectively disposed between the three LCD chips 41 and the three monochromatic coupling inlets 300 of the diffraction waveguide 30, so that the light emitted from the three monochromatic emission surfaces 1102 is first modulated into image light by the corresponding LCD chip 41, and then projected to the corresponding three monochromatic coupling inlets 300 through the corresponding projection lenses 50.

[0072] More preferably, the polarizing element 60 is disposed between the three LCD chips 41 and the three projection lenses 50, which helps to improve the display quality of the near-eye display device 1. It is understood that the polarizing element 60 may be implemented as, but is not limited to, a polarizer, a wire grid, or a PBS, or a series of other components with polarizing functions.

[0073] like Figure 3 As shown, the illumination source 21 in the near-eye display device 1 according to the first application example of this application may include a light-emitting element 211 and a light-collecting and homogenizing system 212. The light-collecting and homogenizing system 212 is disposed in the optical path between the light-emitting element 211 and the multi-color incident surface 1101 of the irregular color separation device 10, and is used to collect and homogenize the light emitted by the light-emitting element 211 so as to transmit it to the multi-color incident surface 1101 of the irregular color separation device 10, and then the processed white light is separated into RGB three monochromatic lights by the irregular color separation device 10.

[0074] It is worth noting that in the first application example described above in this application, such as Figure 3 As shown, the light-emitting element 211 in the illumination source 21 can be, but is not limited to, a white light-emitting element 2111 for emitting white light, and the light-collecting and homogenizing system 212 can be, but is not limited to, a collimating lens 2121. Of course, in other examples of this application, the illumination source 21 can also be implemented as other types of light sources, for example, in the second application example of this application, such as... Figure 4 As shown, the light-gathering and homogenizing system 212 in the lighting source 21 may also include a lens group 2122 and a compound eye device 2123, as long as it can achieve the effect of light gathering and homogenizing. This application will not elaborate further on this. It is understood that the light-gathering and homogenizing system 212 can also be implemented as a light bar or Kola lighting, etc., and a series of other homogenizing methods.

[0075] In particular, in the third application example of this application, such as Figure 5 As shown, the light-emitting element 211 in the illumination source 21 can also be implemented as a monochromatic light-emitting element 2112 for emitting RGB three-color light; correspondingly, the light-gathering and homogenizing system 212 may include a collimating lens 2121 and a color-combining device 2124, wherein the color-combining device 2124 may be composed of a coated wedge prism and a planar substrate. It is understood that the monochromatic light-emitting element 2112 can be an RGB three-in-one packaged light source or an RGB+G two-in-one packaged light source. Correspondingly, the color-combining device 2124 can also be composed of other structures. It is only necessary to adjust the optical path design of the light-gathering and homogenizing system 212 accordingly, which will not be elaborated further in this application.

[0076] It is worth noting that in the various application examples described above in this application, the near-eye display device 1 requires three LCD chips 41 to achieve full-color near-eye display functionality. However, if the LCD chips 41 are only placed between the irregularly shaped color separation device 10 and the illumination source 21, although the number of LCD chips 41 used can be reduced, it results in inconsistent imaging optical paths for the RGB three-color image light, affecting the final display quality. To solve the above problem, a different structure of the irregularly shaped color separation device is provided according to the second embodiment of this application.

[0077] Specifically, such as Figures 6 to 12 As shown, compared to the first embodiment of this application, the difference of the irregular color separation device 10 according to the second embodiment of this application is that the irregular color separation device 10 may include a prism group 11 and three anti-transmission film systems 12, wherein the three anti-transmission film systems 12 are arranged intersectingly on the prism group 11 to form three monochromatic optical paths 100 with equal optical path lengths between a multicolor incident surface 1101 and three monochromatic exit surfaces 1102 of the prism group 11.

[0078] It is worth noting that, because the three anti-transmittance film systems 12 intersect each other, meaning that the three anti-transmittance film systems 12 face different directions and there are different spatial angles between each pair of the three anti-transmittance film systems 12, the three monochromatic light paths 100 formed within the irregularly shaped dichroic device 10 via the three anti-transmittance film systems 12 are not in the same plane. This means that the light spots formed by the three monochromatic lights propagating along the three monochromatic light paths 100 on the surface of the diffraction waveguide 30 are not linearly distributed. In other words, the three monochromatic emission surfaces 1102 of the irregularly shaped dichroic device 10 are non-linearly distributed to correspondingly emit the three monochromatic lights. In other words, the three monochromatic coupling entrances 300 of the diffraction waveguide 30 are non-linearly distributed so that they correspond one-to-one with the three monochromatic emission surfaces 1102 to couple the three monochromatic lights into the waveguide.

[0079] More specifically, such as Figure 11 and Figure 12 As shown, in a first application example of the irregular color separation device 10 according to the second embodiment of this application, the LCD chip 41 is correspondingly disposed between the irregular color separation device 10 and the illumination source 21, and the polarizing element 60 is correspondingly disposed between the LCD chip 41 and the illumination source 21, such that the illumination light emitted by the illumination source 21 is first polarized by the polarizing element 60, and then modulated by the LCD chip 41, and then separated by the irregular color separation device 10, and coupled into the diffraction waveguide 30 by three separate monochromatic coupling inlets 300.

[0080] For example, such as Figures 6 to 10 As shown, the prism group 11 of the irregularly shaped dichroic device 10, in addition to providing a multicolor incident surface 1101 and three monochromatic exit surfaces 1102, can also provide three beam-splitting functional surfaces 1103 for attaching the three anti-transmission film systems 12 and three total internal reflection surfaces 1104 for bending the three monochromatic light paths 100 by total internal reflection, which helps to keep the optical path length of the three monochromatic light paths 100 in the irregularly shaped dichroic device 10 the same while simplifying the structure of the irregularly shaped dichroic device 10 as much as possible. It is understood that the optical path length mentioned in this application is equal to the product between the actual distance of light propagation and the refractive index of the medium; and when the refractive index of each prism in the prism group 11 of the irregularly shaped dichroic device 10 is equal, the equal optical path length of the three monochromatic light paths 100 in the irregularly shaped dichroic device 10 means that their actual distances are equal.

[0081] Preferably, the multicolor incident surface 1101 is parallel to the three monochromatic exiting surfaces 1102, and the three beam-splitting functional surfaces 1103 are respectively parallel to the three total internal reflection surfaces 1104. This helps to ensure that light rays incident perpendicularly from the multicolor incident surface 1101 can exit perpendicularly from the corresponding monochromatic exiting surface 1102, thereby reducing energy loss when light enters or exits the irregularly shaped color-splitting device 10.

[0082] More preferably, the three monochromatic emission surfaces 1102 of the irregularly shaped color separation device 10 are arranged in a triangular pattern, and correspondingly, the three monochromatic coupling entrances 300 of the diffraction waveguide 30 are also arranged in a triangular pattern.

[0083] It is worth noting that, such as Figure 11 and Figure 12As shown, a spatial rectangular coordinate system XYZ is established with the plane containing the multicolor incident surface 1101 of the irregular color separation device 10 as the XY plane. The size of the multicolor incident surface 1101 in the YZ plane is set as a, and the size in the XZ plane is set as b. The size of the irregular color separation device 10 in the Z-axis direction is C. The center projection distance between the monochromatic emission surface 1102 corresponding to green light and the monochromatic emission surface 1102 corresponding to blue light in the YZ plane is H1, and the center projection distance in the XZ plane is H2. The refractive index of the prism group 11 is n. The complementary angle between the anti-reflective film system 12 used to reflect green light and the multicolor incident surface 1101 is θ, and the complementary angle between the anti-reflective film system 12 used to reflect red light and the multicolor incident surface 1101 is β. It is understood that H1 and H2 depend on the positional distribution of each monochromatic coupling entrance 300 in the diffraction waveguide 30, i.e., H1 and H2 are equal to the center projection distances of the green and blue light coupling entrances in the YZ and XZ planes, respectively; θ and β are equal to the angles between the anti-green and anti-red light film systems and the Z-axis, respectively. Furthermore, in other examples of this application, the center projection distances of the green, red, and blue light coupling entrances in the YZ plane may also be different.

[0084] Thus, the optical path S traveled by the green light in the irregularly shaped color separation device 10 Green Implemented as:

[0085]

[0086] Similarly, the optical path S traveled by blue light in the irregularly shaped color separation device 10 Blue Implemented as:

[0087]

[0088] It is understandable that, since the red light path and the blue light path are symmetrically distributed within the irregularly shaped color separation device 10, the optical path S of the red light in the irregularly shaped color separation device 10 is... Red Equal to the optical path S traveled by blue light in the irregularly shaped color separation device 10 Blue S Red =S Blue .

[0089] To ensure that the optical path lengths of the RGB three colors are equal within the irregularly shaped color separation device 10, i.e. S Green =S Blue =S Red After rearranging, we can obtain the following equation:

[0090]

[0091] From the above formula, it is easy to see that: when the following conditions are met... Under this condition, the optical path lengths of the RGB three colors transmitted within the irregularly shaped color separation device 10 must be equal.

[0092] In particular, when H1 = H2, it is only necessary to ensure that θ = β to guarantee that the optical path lengths of the RGB three colors are equal within the irregularly shaped color separation device 10.

[0093] Preferably, θ = β = 45°, that is, the angle between the anti-green light film system and the anti-red light film system and the Z-axis is 45°. It is understood that in other examples of this application, the angle between the anti-green light film system and the anti-red light film system and the Z-axis may also be implemented as other angles, which will not be elaborated here.

[0094] In other words, in the second embodiment described above according to this application, as Figures 6 to 10 As shown, the prism assembly 11 in the irregularly shaped color-separating device 10 may include a cuboid 111 composed of multiple basic prisms and three directional prisms 112. The cuboid 111 provides a multicolor incident surface 1101 and three intersecting beam-splitting functional surfaces 1103. Three anti-reflective coatings 12 are correspondingly attached or plated onto the three beam-splitting functional surfaces 1103. The three directional prisms 112 are correspondingly positioned on the sides of the cuboid 111 to provide three monochromatic exit surfaces 1102 located on the same plane. It is understood that when the multicolor incident surface 1101 of the irregularly shaped color-separating device 10 is a square, i.e., a = b, all three directional prisms 112 are implemented as total internal reflection prisms.

[0095] It is worth noting that in various application examples of the irregularly shaped color separation device 10 according to the first and second embodiments of this application, the display chip 40 of the near-eye display device 1 is implemented as the LCD chip 41. However, this is merely an example and does not constitute a limitation on the scope of protection of this application. It is understood that since different display chips have different display characteristics, different implementation schemes can be designed according to different display chips. In order to demonstrate the advantages and features of the irregularly shaped color separation device 10 of this application, this application will now describe the implementation of the display chip 40 as a DMD chip and an LCoS chip, respectively.

[0096] For example, Appendix Figure 13A second application example of the irregularly shaped color separation device 10 according to the second embodiment described above in this application is shown, wherein the display chip 40 of the near-eye display device 1 is implemented as a DMD chip 42, and the DMD chip 42 is correspondingly disposed in the optical path between the multicolor incident surface 1101 of the irregularly shaped color separation device 10 and the illumination source 21; wherein the near-eye display device 1 may further include components disposed in the illumination source 21, the DMD chip 42, and the irregularly shaped color separator. The TIR prism 70 between the components 10 allows the multicolor illumination light emitted from the illumination source 21 to first undergo total internal reflection through the TIR prism 70 to propagate to the DMD chip 42, and then be modulated by the DMD chip 42 into multicolor image light to pass through the TIR prism 70 and be transmitted to the multicolor incident surface 1101 of the irregular color separation device 10. Finally, the irregular color separation device 10 separates the light into three monochromatic image lights, which are coupled into the diffraction waveguide 30 from the three separate monochromatic coupling entrances 300.

[0097] Appendix Figure 14 A third application example of the irregularly shaped color separation device 10 according to the second embodiment of this application is shown, wherein the display chip 40 of the near-eye display device 1 is still implemented as the DMD chip 42, and the DMD chip 42 is correspondingly disposed in the optical path between the multicolor incident surface 1101 of the irregularly shaped color separation device 10 and the illumination source 21; wherein the near-eye display device 1 may further include components disposed in the illumination source 21, the DMD chip 42, and the irregularly shaped color separation device. The RTIR prism 80 between the 10 points allows the multicolor illumination light emitted from the illumination source 21 to first pass through the RTIR prism 80 to be transmitted to the DMD chip 42. After being modulated into multicolor image light by the DMD chip 42, it is transmitted to the multicolor incident surface 1101 of the irregular color separation device 10 through total internal reflection via the RTIR prism 80. Finally, it is separated into three monochromatic image lights by the irregular color separation device 10, which are coupled into the diffraction waveguide 30 from the three separate monochromatic coupling entrances 300.

[0098] It is understood that the prism that cooperates with the DMD chip 42 in this application is not limited to the TIR prism 70 and the RTIR prism 80, but can also be implemented as other types of optical devices, as long as they can cooperate with the DMD chip 42 to realize optical switching.

[0099] Appendix Figure 15A fourth application example of the irregularly shaped color separation device 10 according to the second embodiment of the present application is shown, wherein the display chip 40 of the near-eye display device 1 is implemented as an LCoS chip 43, and the LCoS chip 43 is correspondingly disposed in the optical path between the multicolor incident surface 1101 of the irregularly shaped color separation device 10 and the illumination source 21; wherein the near-eye display device 1 may further include a polarizing beam splitter 90 disposed between the illumination source 21, the LCoS chip 43 and the irregularly shaped color separation device 10, such that the multicolor illumination light emitted by the illumination source 21 is first polarized and split by the polarizing beam splitter 90 to form multicolor polarized illumination light with a first polarization state, then modulated by the LCoS chip 43 into multicolor polarized image light with a second polarization state, and finally transmitted to the irregularly shaped color separation device 10 via the polarizing beam splitter 90 to be separated into three monochromatic polarized image lights.

[0100] It is understood that the polarizing beam splitter 90 may have an incident surface corresponding to the illumination source 21, a display surface corresponding to the LCoS chip 43, and an exit surface corresponding to the multicolor incident surface 1101 of the irregular color separation device 10. Furthermore, the incident surface of the polarizing beam splitter 90 is perpendicular to the exit surface, while the display surface can be parallel to either the incident or exit surface.

[0101] Optionally, the polarizing beam splitter 90 may, but is not limited to, be implemented as a PBS prism. Furthermore, light having a first polarization state may be implemented as P-light or S-light, and correspondingly, light having a second polarization state may be implemented as S-light or P-light.

[0102] It is worth noting that in the various application examples described above in this application, the light source 20 in the near-eye display device 1 is implemented as the illumination light source 21, which can only provide illumination light without image information. Therefore, various display chips (such as LCD chip 41, DMD chip 42, and LCoS chip 43, etc.) need to be configured accordingly to modulate the illumination light into image light. However, when the light source 20 is implemented as an image light source that can directly provide image light, the near-eye display device 1 will not need to be specially configured with display chips.

[0103] Specifically, Figure 16A fifth application example of the irregularly shaped color separation device 10 according to the second embodiment of this application is shown, wherein the light source 20 of the near-eye display device 1 is implemented as an image light source 22 for providing image light, and the image light source 22 corresponds to the multicolor incident surface 1101 of the irregularly shaped color separation device 10. Thus, the image light emitted via the image light source 22, after entering the irregularly shaped color separation device 10 from the multicolor incident surface 1101, is directly separated into three paths of red image light, blue image light, and green image light by the irregularly shaped color separation device 10, so that they exit from the three monochromatic exit surfaces 1102 to the three monochromatic coupling entrances 300 of the diffraction waveguide 30, respectively.

[0104] Preferably, the image light source 22 is implemented as a full-color MicroLED, which helps to minimize the size of the near-eye display device 1.

[0105] It is worth mentioning that, although when the display chip 40 is implemented as the LCoS chip 43, in the fourth application example of this application, the polarizing beam splitter 90 needs to be configured for the LCoS chip 43 to realize the optical path for image modulation, in other embodiments of this application, the polarizing beam splitter 90 may not be configured for the LCoS chip 43, and the irregular color separation device 10 may be used directly to realize the optical path for image modulation and the optical path for color separation.

[0106] Specifically, such as Figure 17 As shown, a third embodiment of this application provides an irregularly shaped color-separating device 10. In addition to having a multicolor incident surface 1101, three monochromatic exiting surfaces 1102, three beam-splitting functional surfaces 1103, and three total internal reflection surfaces 1104, the prism group 11 of the irregularly shaped color-separating device 10 may further have a multicolor display surface 1105 parallel to the multicolor incident surface 1101. The multicolor display surface 1105 of the prism group 11 corresponds to the LCoS chip 43, and the anti-reflection film system 12 reflects polarized light with a predetermined color and a first polarization state, while transmitting light of other colors. In other words, the LCoS chip 43 and the illumination source 21 are respectively and correspondingly drawn on opposite sides of the irregularly shaped color-separating device 10. It is understood that in this embodiment of the application, the anti-reflection characteristics of the anti-reflection film system 12 are not only color selective but also polarization selective.

[0107] Preferably, the multicolor incident surface 1101 and the three monochromatic exiting surfaces 1102 of the prism assembly 11 are located on the same plane, such that the light source 20 and the diffraction waveguide 30 are on the same side of the irregularly shaped color separation device 10, while the smaller LCoS chip 43 and the diffraction waveguide 30 are on opposite sides of the irregularly shaped color separation device 10, which helps to reduce the overall size of the near-eye display device 1. It is understood that in other examples of this application, the multicolor display surface 1105 and the three monochromatic exiting surfaces 1102 of the prism assembly 11 are located on the same plane, such that the smaller LCoS chip 43 and the diffraction waveguide 30 are on the same side of the irregularly shaped color separation device 10, which helps to avoid structural interference between the larger light source 20 and the diffraction waveguide 30 or the projection lens 50, and facilitates a reduction in assembly difficulty.

[0108] For example, in one application example of the irregularly shaped color separation device 10 according to the third embodiment of this application, the first of the three anti-reflection film systems 12 can reflect red light in the S-polarization state and transmit red light in the P-polarization state and other colors of light; the second of the three anti-reflection film systems 12 can reflect blue light in the S-polarization state and transmit blue light in the P-polarization state and other colors of light; the third of the three anti-reflection film systems 12 can reflect green light in the S-polarization state and transmit green light in the P-polarization state.

[0109] Thus, after the multicolor illumination light emitted by the light source 20 enters the irregularly shaped color separation device 10 from the multicolor incident surface 1101, one of the RGB illumination lights with a P-polarization state will first pass through the irregularly shaped color separation device 10 and exit from the multicolor display surface 1105. Then, it will be modulated by the LCoS chip 43 into an RGB image light with an S-polarization state and reflected back to the multicolor display surface 1105 of the irregularly shaped color separation device 10. After that, the RGB image light with an S-polarization state will be separated by the irregularly shaped color separation device 10 into three images with S-polarization states: red image light, blue image light, and green image light. These images will then exit from the three monochromatic exit surfaces 1102 and be emitted to the three monochromatic coupling entrances 300 of the diffraction waveguide 30, respectively.

[0110] It is worth mentioning that, according to another aspect of this application, such as Figure 17As shown, one embodiment of this application can further provide a near-eye display optical engine for providing three monochromatic image lights to a diffraction waveguide 30. The near-eye display optical engine may include the aforementioned irregularly shaped color separation device 10 and a light source 20. The irregularly shaped color separation device 10 is correspondingly disposed on the light-emitting side of the light source 20, such that one light emitted from the light source 20 is first separated into three monochromatic lights by the irregularly shaped color separation device 10, which are then coupled into the diffraction waveguide 30 through three monochromatic coupling inlets 300 respectively to be transmitted to the human eye to realize near-eye display.

[0111] Furthermore, according to another aspect of this application, such as Figures 3 to 5 and Figures 11 to 17 As shown, one embodiment of this application can further provide a near-eye display device, which may include the above-mentioned irregular color separation device 10, light source 20 and diffraction waveguide 30, wherein the irregular color separation device 10 is correspondingly disposed in the optical path between the light source 20 and the diffraction waveguide 30, such that one light emitted by the light source 20 is first separated into three monochromatic lights by the irregular color separation device 10, and then coupled into the diffraction waveguide 30 through the three monochromatic coupling inlets 300 respectively to be transmitted to the human eye to realize near-eye display.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An anamorphic color separation device for being disposed in an optical path between a light source and a diffractive waveguide, respectively, characterized in that, The special-shaped color separation device comprises: a prism group, wherein the prism group has one polychromatic incident surface corresponding to the light source and three monochromatic exit surfaces corresponding to the three monochromatic coupling entrances of the diffraction waveguide respectively; and at least two anti-reflection film systems, wherein the at least two anti-reflection film systems are correspondingly arranged in the prism group to form three monochromatic light paths between the polychromatic incident surface and the three monochromatic exit surfaces, wherein the at least two anti-reflection film systems are respectively used for reflecting light of a predetermined color and transmitting light of other colors, so that one light emitted by the light source is first color separated into three monochromatic lights via the anti-reflection of the corresponding anti-reflection film system after being incident from the polychromatic incident surface, and then transmitted to the three monochromatic coupling entrances of the diffraction waveguide along the corresponding monochromatic light paths respectively; the at least two anti-reflection film systems are three anti-reflection film systems; the prism group further provides three light splitting functional surfaces for attaching the three anti-reflection film systems and three total reflection surfaces for bending the three monochromatic light paths by total reflection respectively; the prism group comprises a cubic body spliced by a plurality of base prisms and three turning prisms, wherein the cubic body provides the polychromatic incident surface and the three light splitting functional surfaces intersecting with each other, and the three anti-reflection film systems are correspondingly attached or plated on the three light splitting functional surfaces, wherein the three turning prisms are correspondingly arranged at the side of the cubic body to provide the three total reflection surfaces and the three monochromatic exit surfaces located in the same plane.

2. The anamorphic color separation device of claim 1, wherein The three anti-reflection film systems are arranged intersecting with each other in the prism group to form the three monochromatic light paths with equal optical paths between the polychromatic incident surface and the three monochromatic exit surfaces of the prism group.

3. The anamorphic color separation device of claim 2, wherein, The polychromatic incident surface is parallel to the three monochromatic exit surfaces, and the three light splitting functional surfaces are correspondingly parallel to the three total reflection surfaces respectively.

4. The anamorphic color separation device of claim 1, wherein, The included angles between the three anti-reflection film systems and the polychromatic incident surface are all 45°.

5. The anamorphic color separation device of claim 2, wherein, The prism group further provides a polychromatic display surface corresponding to a display chip, wherein the polychromatic display surface is parallel to the three monochromatic exit surfaces, and the three light splitting functional surfaces are correspondingly parallel to the three total reflection surfaces respectively, wherein the polychromatic display surface is parallel to the polychromatic incident surface, and the three anti-reflection film systems are respectively used for reflecting polarized light having the predetermined color and a first polarization state and transmitting light of other colors.

6. The anamorphic color separation device of claim 5, wherein, The polychromatic incident surface and the three monochromatic exit surfaces of the prism group are in the same plane.

7. A heteromorphic color splitting device according to any one of claims 2 to 6, wherein The three monochromatic lights are red light, green light and blue light respectively.

8. A near-eye display device, characterized by, The special-shaped color separation device comprises: a prism group, wherein the prism group has one polychromatic incident surface corresponding to the light source and three monochromatic exit surfaces corresponding to the three monochromatic coupling entrances of the diffraction waveguide respectively; and at least two anti-reflection film systems, wherein the at least two anti-reflection film systems are correspondingly arranged in the prism group to form three monochromatic light paths between the polychromatic incident surface and the three monochromatic exit surfaces, wherein the at least two anti-reflection film systems are respectively used for reflecting light of a predetermined color and transmitting light of other colors, so that one light emitted by the light source is first color separated into three monochromatic lights via the anti-reflection of the corresponding anti-reflection film system after being incident from the polychromatic incident surface, and then transmitted to the three monochromatic coupling entrances of the diffraction waveguide along the corresponding monochromatic light paths respectively; ​ ​ ​ at least two anti-reflective film systems, wherein the at least two anti-reflective film systems are correspondingly arranged at the prism group to form three monochromatic light paths between the polychromatic incident surface and the three monochromatic exit surfaces, wherein the at least two anti-reflective film systems are respectively configured to reflect light of a predetermined color and transmit light of other colors, such that the light emitted by the light source is first split into three monochromatic lights via the corresponding anti-reflective film systems after being incident from the polychromatic incident surface, and then transmitted to the three monochromatic coupling-in ports of the diffractive waveguide along the corresponding monochromatic light paths respectively; the at least two anti-reflective film systems are three anti-reflective film systems, and the prism group further comprises three light splitting functional surfaces for attaching the three anti-reflective film systems and three total reflection surfaces for respectively totally reflecting the three monochromatic light paths; the prism group comprises a cuboid and three turning prisms, wherein the cuboid provides the polychromatic incident surface and the three light splitting functional surfaces which are mutually crossed, and the three anti-reflective film systems are correspondingly attached or coated on the three light splitting functional surfaces, and the three turning prisms are correspondingly arranged at the side of the cuboid to provide the three total reflection surfaces and the three monochromatic exit surfaces which are located in the same plane.

9. The near-eye display device of claim 8, wherein, the light source is an illumination light source, and the near-eye display device further comprises a display chip correspondingly arranged in the light path between the illumination light source and the diffractive waveguide, for modulating the illumination light emitted by the illumination light source into corresponding image light.

10. The near-eye display device of claim 9, wherein, the display chip is three LCD chips, and the three LCD chips are correspondingly arranged between the three monochromatic exit surfaces of the special dichroic device and the three monochromatic coupling-in ports of the diffractive waveguide respectively, for correspondingly modulating the three monochromatic illumination lights emitted from the three monochromatic exit surfaces into three monochromatic image lights to be coupled into the diffractive waveguide from the three monochromatic coupling-in ports respectively.

11. The near-eye display device of claim 9, wherein, the display chip is one LCD chip, wherein the LCD chip is correspondingly arranged between the polychromatic incident surface of the special dichroic device and the illumination light source, for modulating the polychromatic illumination light emitted by the illumination light source into polychromatic image light first, and then splitting the polychromatic image light in the special dichroic device.

12. The near-eye display device of claim 9, wherein, the display chip is one DMD chip, and the DMD chip is correspondingly arranged in the light path between the polychromatic incident surface of the special dichroic device and the illumination light source, wherein the near-eye display device further comprises a TIR prism or an RTIR prism, and the TIR prism or the RTIR prism is arranged between the illumination light source, the DMD chip and the polychromatic incident surface of the special dichroic device.

13. The near-eye display device of claim 9, wherein, The display chip is an LCoS chip, and the LCoS chip is correspondingly arranged in the light path between the multi-color incident surface of the special color separation device and the illumination light source, wherein the near-eye display device further comprises a polarization beam splitter, and the polarization beam splitter is arranged between the illumination light source, the LCoS chip and the multi-color incident surface of the special color separation device.

14. The near-eye display device of claim 9, wherein, The display chip is an LCoS chip, and the illumination light source and the LCoS chip are correspondingly arranged on opposite sides of the special color separation device, and the three anti-reflection film systems are respectively used for reflecting polarized light with the predetermined color and the first polarization state and transmitting light of other colors.

15. The near-eye display device of claim 8, wherein, The light source is an image light source, and the image light source is a full-color MicroLED.

16. The near-eye display device of any one of claims 9 to 15, wherein, The near-eye display device further comprises three projection lenses, and the three projection lenses are correspondingly arranged in the light path between the three monochromatic exit surfaces of the special color separation device and the three monochromatic coupling entrances of the diffraction waveguide, respectively.

17. A near-eye display optomechanism for providing three monochromatic image lights for a diffraction waveguide, characterized in that, The near-eye display optical machine comprises: a light source, wherein the light source is used for emitting a light; and a special color separation device, wherein the special color separation device is correspondingly arranged on the light-emitting side of the light source, used for being located in the light path between the light source and the diffraction waveguide, and the special color separation device comprises: a prism group, wherein the prism group has a multi-color incident surface corresponding to the light source and three monochromatic exit surfaces corresponding to the three monochromatic coupling entrances of the diffraction waveguide one by one; and at least two anti-reflection film systems, wherein the at least two anti-reflection film systems are correspondingly arranged in the prism group to form three monochromatic light paths between the multi-color incident surface and the three monochromatic exit surfaces, wherein the at least two anti-reflection film systems are respectively used for reflecting light of a predetermined color and transmitting light of other colors, so that the light emitted by the light source is separated into three monochromatic lights via the corresponding anti-reflection film systems after being incident from the multi-color incident surface, and then transmitted to the three monochromatic coupling entrances of the diffraction waveguide along the corresponding monochromatic light paths, respectively; The at least two anti-reflection film systems are three anti-reflection film systems; the prism group further provides three light splitting functional surfaces for attaching the three anti-reflection film systems and three total reflection surfaces for bending the three monochromatic light paths by total reflection, respectively; The prism group comprises a cube spliced by a plurality of base prisms and three turning prisms, wherein the cube provides the multi-color incident surface and the three light splitting functional surfaces intersecting with each other, and the three anti-reflection film systems are correspondingly attached or plated on the three light splitting functional surfaces, respectively; and the three turning prisms are correspondingly arranged on the side of the cube to provide the three total reflection surfaces and the three monochromatic exit surfaces located in the same plane.

Images