Waveguide device, near-eye display system and near-eye display method for improving light efficiency

Abstract

The application discloses a waveguide device, a near-eye display system and a near-eye display method for improving light efficiency, and belongs to the technical field of waveguide diffraction. The waveguide device for improving light efficiency comprises two polarized light processors, which are used for receiving mutually orthogonal first polarized light and second polarized light, wherein one of the first polarized light and the second polarized light is left-handed polarized light, and the other is right-handed polarized light; the polarized light processor is used for coupling in the first polarized light and transmitting the second polarized light, and coupling out the first polarized light after converting the first polarized light into the second polarized light; an intermediate phase modulation element is arranged between the two polarized light processors, and the intermediate phase modulation element is combined with a polarized light processor to realize conversion of the second polarized light transmitted through the polarized light processor into the first polarized light, and make the converted first polarized light incident to the other polarized light processor; wherein the light emission directions of the second polarized light coupled out by the two polarized light processors are on the same side. The application can reduce light loss and improve waveguide display brightness.

Description

Technical Field

[0001] The present application relates to the technical field of waveguide diffraction, and in particular to a waveguide device, a near-eye display system, and a near-eye display method for improving light efficiency. Background Art

[0002] In recent years, the AR field has received increasing attention. The implementation of AR technology relies on near-eye display devices, which can project virtual images into real scenes, giving users a sense of immersion, which can not only improve user experience but also increase productivity.

[0003] As an important component of AR near-eye display, diffraction waveguide is considered to be an essential optical solution for consumer-grade AR glasses due to its lightness, thinness and high penetration of external light.

[0004] In existing diffraction waveguides, there is a large amount of light loss when light is coupled into the waveguide through the coupling grating. Figure 1 As shown, 140 is the coupling-in optical element, and 150 is the waveguide substrate. Light 160 is diffracted by coupling-in optical element 140 and enters waveguide substrate 150. Angle a should be greater than the critical angle of total internal reflection of waveguide substrate 150. Light 160 is totally reflected in waveguide substrate 150. After one total internal reflection, light 160 is incident on coupling-in optical element 140 again. Coupling-in optical element 140 diffracts a significant portion of the light out of waveguide substrate 150, resulting in significant optical loss. Summary of the Invention

[0005] In order to reduce light loss and improve the brightness of waveguide display, the present application provides a waveguide device, a near-eye display system and a near-eye display method for improving light efficiency.

[0006] The present application provides a waveguide device for improving light efficiency using the following technical solutions:

[0007] First aspect

[0008] A waveguide device for improving light efficiency, comprising:

[0009] Two polarization light processors are used to receive mutually orthogonal first polarization light and second polarization light, wherein one of the first polarization light and the second polarization light is left-handed polarization light and the other is right-handed polarization light; the polarization light processor is used to couple the first polarization light and transmit the second polarization light, and convert the coupled first polarization light into the second polarization light before coupling out;

[0010] An intermediate phase modulator is disposed between the two polarization light processors. The intermediate phase modulator is combined with a polarization light processor to convert the second polarization light transmitted through the polarization light processor into the first polarization light, and the converted first polarization light is incident on the other polarization light processor.

[0011] The second polarized light coupled out by the two polarized light processors is on the same side of the light-out direction.

[0012] By adopting the technical scheme, the polarized light processor can only couple in the first polarized light, and the polarized light processor can convert the first polarized light into the second polarized light. At this time, the optical element that couples in the first polarized light will not diffract the second polarized light, so that the situation that the coupled-in first polarized light is diffracted out by the optical element that couples in the first polarized light in the transmission process can be effectively reduced, thereby the light loss can be reduced and the brightness of the waveguide display can be improved.

[0013] Optionally, the polarized light processor comprises a waveguide substrate, a polarized light coupling-in element arranged on one side of the surface of the waveguide substrate, a polarized light coupling-out element arranged on the other side of the surface of the waveguide substrate, and a phase modulation device arranged on the surface of the waveguide substrate and opposite to the polarized light coupling-in element. The phase modulation device can adjust the phase of the first polarized light so that the first polarized light is converted into the second polarized light when being reflected and incident on the polarized light coupling-in element and then transmitted in the waveguide substrate.

[0014] By adopting the technical scheme, the first polarized light and the second polarized light that are orthogonal to each other are incident on the polarized light coupling-in element. The polarized light coupling-in element only diffracts the first polarized light and transmits the second polarized light. The first polarized light is totally reflected by the phase modulation device and then converted into the second polarized light. The second polarized light is incident on the polarized light coupling-in element. Since the polarized light coupling-in element only diffracts the first polarized light, the second polarized light is totally reflected by the polarized light coupling-in element and then continues to be transmitted in the waveguide substrate. This scheme reduces the light diffraction from the polarized light coupling-in element and reduces the light loss, thereby greatly improving the light utilization rate.

[0015] Optionally, the polarized light coupling-out element and the polarized light coupling-in element are located on the same surface or opposite surfaces of the waveguide substrate.

[0016] By adopting the technical scheme, the light path propagation direction can be changed according to requirements, and the adaptability is improved.

[0017] Optionally, the phase modulation device and the intermediate phase modulation element are both 1 / 4 wave plates.

[0018] Optionally, the adjacent polarized light processors are oppositely arranged, and the intermediate phase modulation element is arranged in a spaced manner between the adjacent polarized light processors.

[0019] By adopting the technical scheme, the opposite arrangement helps to reduce the overall size of the system, and the spaced arrangement ensures the conversion of the polarized light.

[0020] Optionally, the adjacent polarization light processors are arranged in a staggered manner, and a refractive device is arranged between the adjacent polarization light processors, and the refractive device is used to transmit the second polarization light transmitted through a polarization light processor to another polarization light processor.

[0021] By using the above technical solution, the staggered arrangement enables each polarization light processor to independently process and regulate the optical signal without being affected by the adjacent polarization light processor. Meanwhile, the staggered arrangement can avoid direct optical path coupling, which helps to reduce the cross interference between the optical paths and improve the stability and performance of the system.

[0022] The second aspect

[0023] A near-eye display system includes the above waveguide device for improving light efficiency and

[0024] An image light output unit is configured to emit first polarization light and second polarization light that are orthogonal to each other, wherein one of the first polarization light and the second polarization light is left-handed polarization light, and the other is right-handed polarization light.

[0025] Optionally, the image light output unit further includes an image light output module, a polarization device, and a phase modulation element with timing control, the image light output module is configured to emit unpolarized light, the polarization device is configured to convert the unpolarized light into linearly polarized light, and the phase modulation element is configured to convert the linearly polarized light into left-handed polarization light and right-handed polarization light carrying different information.

[0026] By using the above technical solution, the light is divided into left-handed polarization light and right-handed polarization light before being coupled into the polarization light coupling-in element, and the left-handed polarization light and the right-handed polarization light respectively carry different image information, which is projected to the human eye after being transmitted through the waveguide substrate. This scheme not only can increase the utilization efficiency of light, but also can expand the field of view.

[0027] Optionally, the angle of the light coupled out of one polarization light processor is different from the angle of the light coupled out of another polarization light processor.

[0028] The third aspect

[0029] A near-eye display method includes the following steps:

[0030] Emitting left-handed polarization light and right-handed polarization light that are orthogonal to each other;

[0031] Diffracting the left-handed polarization light and transmitting the right-handed polarization light, converting the processed left-handed polarization light into right-handed polarization light, and conducting the right-handed polarization light to the human eye by total reflection to form an image;

[0032] transmitting the transmitted right-handed polarized light into left-handed polarized light, processing the left-handed polarized light into right-handed polarized light, and conducting the right-handed polarized light to the human eye by total reflection to form an image; or

[0033] transmitting a right-handed polarized light and a left-handed polarized light which are orthogonal to each other;

[0034] diffracting right-handed polarized light and transmitting left-handed polarized light, processing the right-handed polarized light into left-handed polarized light, and conducting the left-handed polarized light to the human eye by total reflection to form an image;

[0035] transmitting the transmitted left-handed polarized light into right-handed polarized light, processing the right-handed polarized light into left-handed polarized light, and conducting the left-handed polarized light to the human eye by total reflection to form an image.

[0036] In summary, the present application has at least one of the following beneficial technical effects:

[0037] 1. The present application can reduce light loss and greatly improve light utilization.

[0038] 2. The adjacent polarization light processors are arranged in a staggered manner, which enables each polarization light processor to independently process and regulate the optical signal without being affected by the adjacent polarization light processor. Meanwhile, the staggered arrangement can avoid direct optical coupling, which helps to reduce the cross interference between the optical paths and improve the stability and performance of the system.

[0039] 3. The incident polarized light is divided into left-handed polarized light and right-handed polarized light before being coupled into the element, and the left-handed polarized light and the right-handed polarized light carry different image information, which is projected to the human eye after being transmitted by the waveguide substrate. This scheme not only can increase the utilization efficiency of light, but also can expand the field of view. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a structural diagram of an existing diffractive waveguide.

[0041] Figure 2 is a structural diagram of one embodiment of the near-eye display system of the present application.

[0042] Figure 3 is a structural diagram of a near-eye display system containing a refractive device.

[0043] Figure 4 is a structural diagram of another embodiment of the near-eye display system of the present application.

[0044] REFERENCE SIGNS:

[0045] 10. Image light output unit; 20. First waveguide substrate; 30. First polarized light coupling element; 40. First polarized light outcoupling element; 50. First phase modulator; 60. Intermediate phase modulator; 70. Second waveguide substrate; 80. Second polarized light coupling element; 90. Second polarized light outcoupling element; 100. Second phase modulator; 101. Refractive element; 110. Image light output module; 120. Polarizer; 130. Phase modulator. DETAILED DESCRIPTION

[0046] The following is combined with Figure 1-4 This application is described in further detail.

[0047] The embodiments consistent with the present disclosure will be described with reference to the accompanying drawings, which are examples for illustrative purposes only and are not intended to limit the scope of the present disclosure. Where possible, the same reference numerals are used throughout the drawings to refer to the same or similar parts and their detailed description may be omitted.

[0048] In addition, in the present disclosure, the disclosed embodiments and features of the disclosed embodiments may be combined. The embodiments described above are partial embodiments of the present invention, not all embodiments. Based on the disclosed embodiments, a person of ordinary skill in the art may derive other embodiments consistent with the present disclosure. For example, modifications, adjustments, replacements, additions, or other changes may be made based on the disclosed embodiments. Such changes to the disclosed embodiments are still within the scope of the present disclosure. Therefore, the present disclosure is not limited to the disclosed embodiments. Instead, the scope of the present disclosure is defined by the appended claims.

[0049] As used herein, the terms "couple", "coupled", "coupling" and the like may encompass optical coupling, mechanical coupling, electrical coupling, electromagnetic coupling or a combination thereof. "Optical coupling" between two optical elements refers to a configuration in which the two optical elements are arranged in an optical sequence, and light output from one optical element can be received directly or indirectly by the other optical element. An optical sequence refers to the optical positioning of multiple optical elements in an optical path such that light output from one optical element can be transmitted, reflected, diffracted, converted, modified or otherwise processed or manipulated by one or more other optical elements. In some embodiments, the sequence in which the multiple optical elements are arranged may or may not affect the overall output of the multiple optical elements. The coupling may be direct coupling or indirect coupling (e.g., coupling via an intermediate element).

[0050] The present application discloses a waveguide device for improving light efficiency. Figure 2In one embodiment, the waveguide device for improving light efficiency includes two polarization light processors, the polarization light processors are used to receive mutually orthogonal first polarization light and second polarization light, one of the first polarization light and the second polarization light is left-handed polarization light, and the other is right-handed polarization light; the polarization light processors are only used to couple in the first polarization light and transmit the second polarization light, and the coupled-in first polarization light is out-coupled after being converted into the second polarization light.

[0051] An intermediate phase modulation element 60 is arranged between the two polarization light processors, and the intermediate phase modulation element 60 is used in combination with one polarization light processor to convert the second polarization light transmitted through the one polarization light processor into the first polarization light and make the first polarization light incident on the other polarization light processor. The out-coupled second polarization light of the two polarization light processors is on the same side.

[0052] For the convenience of description and understanding, in one embodiment, one polarization light processor includes a first waveguide substrate 20, a first polarization light in-coupling element 30 arranged on one side of a surface of the first waveguide substrate 20, a first polarization light out-coupling element 40 arranged on the other side of the surface of the first waveguide substrate 20, and a first phase modulation element 50 arranged on the surface of the first waveguide substrate 20 and opposite to the first polarization light in-coupling element 30, the first phase modulation element 50 is capable of adjusting the phase of the first polarization light to make the first polarization light converted into the second polarization light when the first polarization light is reflected and incident on the first polarization light in-coupling element 30 and transmitted in the first waveguide substrate 20.

[0053] The other polarization light processor includes a second waveguide substrate 70, a second polarization light in-coupling element 80 arranged on one side of a surface of the second waveguide substrate 70, a second polarization light out-coupling element 90 arranged on the other side of the surface of the second waveguide substrate 70, and a second phase modulation element 100 arranged on the surface of the second waveguide substrate 70 and opposite to the second polarization light in-coupling element 80, the second phase modulation element 100 is capable of adjusting the phase of the first polarization light to make the first polarization light converted into the second polarization light when the first polarization light is reflected and incident on the second polarization light in-coupling element 80 and transmitted in the second waveguide substrate 70.

[0054] The first polarization light in-coupling element 30 and the second polarization light in-coupling element 80 are polarization-sensitive diffractive optical elements, which can be surface relief gratings or volume holographic gratings, and the first polarization light out-coupling element 40 and the second polarization light out-coupling element 90 are polarization-sensitive diffractive optical elements or non-polarization-sensitive diffractive optical elements, which can be surface relief gratings or volume holographic gratings.

[0055] In a preferred embodiment, the first polarized light is left-handed polarized light, and the second polarized light is right-handed polarized light. The first polarized light coupling element 30 is a first left-handed polarization holographic grating, and the first phase modulator 50, the second phase modulator 100 and the intermediate phase modulator 60 are all 1 / 4 wave plates.

[0056] At this point, the first left-handed polarization holographic grating receives mutually orthogonal left-handed polarized light and right-handed polarized light. It diffracts the left-handed polarized light to form light 202 and transmits the right-handed polarized light to form light 203. Light 202 enters the first waveguide substrate 20 at an angle greater than the critical angle for total internal reflection of the first waveguide substrate 20. Light 202 is transmitted through the first waveguide substrate 20 by total internal reflection. After total internal reflection at the quarter-wave plate, light 202 experiences a phase difference of half a wavelength, transforming from left-handed polarized light to right-handed polarized light. When light 202 again enters the first left-handed polarization holographic grating, it undergoes total internal reflection upon entering the first left-handed polarization holographic grating, and is not diffracted at the first left-handed polarization holographic grating. Therefore, the light 202 is totally reflected and transmitted in the first waveguide substrate 20 , and the first polarized light outcoupling element 40 couples the totally reflected light 202 out and expands the pupil.

[0057] Light 203 passes through the first phase modulator 50 and the intermediate phase modulator 60, generating a phase difference of half a wavelength, transforming light 203 from right-handed polarized light to left-handed polarized light. Light 203 then enters the second left-handed polarization holographic grating, which diffracts the left-handed polarized light. After diffraction by the second left-handed polarization holographic grating, the angle of light 203 diffracted by the second left-handed polarization holographic grating is greater than the critical angle for total internal reflection of the second waveguide substrate 70, and the light is transmitted by total internal reflection within the second waveguide substrate 70. After total reflection from the second phase modulator 100, light 203 experiences a phase difference of half a wavelength, transforming light 203 from left-handed polarized light to right-handed polarized light. When light 203 is incident on the second left-handed polarization holographic grating again, it is totally reflected and not diffracted at the second left-handed polarization holographic grating. Since the second left-handed polarization holographic grating only diffracts left-handed polarization light and does not react with right-handed polarization light, light 203 is totally reflected and not diffracted at the second left-handed polarization holographic grating. The second polarization light outcoupling element 90 couples the totally reflected light 203 and expands the pupil.

[0058] Therefore, the light will not be diffracted by the coupling element, but will be totally reflected at the coupling element, which will not cause light loss and greatly improve the utilization rate of light.

[0059] In the embodiment, the polarized light out-coupling element and the polarized light in-coupling element are located on the same surface of the waveguide substrate, and in another embodiment, the polarized light out-coupling element and the polarized light in-coupling element can also be located on opposite surfaces of the waveguide substrate.

[0060] Referring to Figure 2 In an embodiment, the two polarized light processors are arranged oppositely, and the intermediate phase modulation member 60 is arranged between the two polarized light processors. At this time, the first phase modulation member 50 is attached to the surface of the first waveguide substrate 20, and there is no air layer between the first phase modulation member 50 and the first waveguide substrate 20. The second phase modulation member 100 is attached to the surface of the second waveguide substrate 70, and there is no air layer between the second phase modulation member 100 and the second waveguide substrate 70. The intermediate phase modulation member 60 has an air layer between the first phase modulation member 50 and the second polarized light in-coupling element 80. The air layer can reduce the transmission loss of light and improve the transmission efficiency of optical signals. The presence of the intermediate air layer can simplify the coupling structure and design between devices, making the manufacturing and adjustment of the devices easier.

[0061] Referring to FIG. 3, in another embodiment, the two polarized light processors are arranged in a staggered manner, and a refractive device 101 is arranged between adjacent polarized light processors. The refractive device 101 is used to transmit the second polarized light transmitted through a polarized light processor to another polarized light processor. In some embodiments, the refractive device 101 can be a refractive prism combination or a fiber coupler. The staggered arrangement allows each polarized light processor to independently process and regulate optical signals without being affected by adjacent polarized light processors. At the same time, the staggered arrangement can avoid direct optical path coupling, which helps to reduce cross-interference between optical paths and improve the stability and performance of the system.

[0062] The embodiment of the application also discloses a near-eye display system, which comprises the waveguide device for improving light efficiency and the image light output unit 10. The image light output unit 10 is used to emit first polarized light and second polarized light which are orthogonal to each other. One of the first polarized light and the second polarized light is left-handed polarized light, and the other is right-handed polarized light.

[0063] In an embodiment, the image light output unit 10 emits non-polarized light, and the non-polarized light can be decomposed into left-handed polarized light and right-handed polarized light which are orthogonal to each other.

[0064] The image light output unit 10 can include, for example, a laser diode, a vertical cavity surface emitting laser, a light emitting diode, or a combination thereof. In some embodiments, the image light output unit 10 can be a display panel, such as a liquid crystal display (“LCD”) panel, a liquid crystal on silicon (“LCoS”) display panel, an organic light emitting diode (“OLED”) display panel, a micro light emitting diode (“micro-LED”) display panel, a digital light processing (“DLP”) display panel, a laser scanning projector, a super light emitting diode (“SLED”) scanning projector, or a combination thereof. In some embodiments, the image light output unit 10 can be a self-emissive panel, such as an OLED display panel or a micro-LED display panel. In some embodiments, the image light output unit 10 can be a display panel illuminated by an external source, such as an LCD panel, an LCoS display panel, or a DLP display panel. Examples of the image light output unit 10 can include a laser, an LED, an OLED, or a combination thereof.

[0065] Referring to Figure 4 In another embodiment, the image light output unit 10 further includes an image light output module 110, a polarization device 120, and a phase modulation element 130 with timing control. The image light output module 110 emits unpolarized light, which becomes linearly polarized light after passing through the polarization device 120. The phase modulation element 130 can be an electrically controlled liquid crystal 1 / 4 wave plate, which has two phase states. Phase state 1 can convert the linearly polarized light into left-handed polarized light, and phase state 2 can convert the linearly polarized light into right-handed polarized light. The two phase states are switched at a certain frequency. After passing through the electrically controlled liquid crystal 1 / 4 wave plate, the linearly polarized light is divided into left-handed polarized light and right-handed polarized light, and the light beam is composed of the left-handed polarized light and the right-handed polarized light. For example, if the image signal carried by the linearly polarized light is 120 Hz, and the frequency of switching between the two phase states of the electrically controlled liquid crystal 1 / 4 wave plate is 60 Hz, then the image signal carried by the left-handed polarized light and the right-handed polarized light is 60 Hz.

[0066] At this time, the left-handed polarized light and the right-handed polarized light carry two different image information respectively. The left-handed polarized light and the right-handed polarized light sequentially pass through the deflection light processor for in-coupling and out-coupling according to the above principle, and are finally transmitted into the human eye. The first polarization light out-coupling element 40 out-couples and expands the pupil of the light ray 202 transmitted by total reflection, and the second polarization light out-coupling element 90 out-couples and expands the pupil of the light ray 203 transmitted by total reflection. The light ray out-coupled by the first polarization light out-coupling element 40 and the light ray out-coupled by the second polarization light out-coupling element 90 are in different directions, which expands the field of view. This scheme not only increases the utilization efficiency of light, but also expands the field of view.

[0067] The present application also discloses a near-eye display method. The method comprises the following steps:

[0068] S10, emitting left-hand polarized light and right-hand polarized light that are orthogonal to each other.

[0069] S20, diffracting the left-handed polarized light and transmitting the right-handed polarized light, converting the left-handed polarized light into right-handed deflected light through processing, and transmitting the right-handed polarized light to the human eye by total reflection to form an image.

[0070] S30, converting the transmitted right-handed polarized light into left-handed polarized light, converting the left-handed polarized light into right-handed polarized light through processing, and transmitting the right-handed polarized light to the human eye by total reflection to form an image.

[0071] Step S10 may include:

[0072] S101 : The image light output unit 10 emits unpolarized light, which can be decomposed into left-handed polarized light and right-handed polarized light that are orthogonal to each other and carry the same information.

[0073] In other embodiments, step S10 may also include:

[0074] S102 , the image light output unit 10 emits unpolarized light, which is converted into left-handed polarized light and right-handed polarized light carrying different image information after passing through the polarizer 120 and the phase modulation element 130 .

[0075] In one embodiment, step S20 may include:

[0076] S201. A polarization processor diffracts left-handed polarized light and transmits right-handed polarized light. A polarization processor converts the left-handed polarized light into right-handed deflected light by total internal reflection. The polarization processor transmits the right-handed polarized light by total internal reflection and couples the right-handed polarized light out to the human eye for imaging.

[0077] In one embodiment, step S30 may include:

[0078] S301, another polarization light processor converts the right-handed polarized light transmitted by the previous polarization light processor into left-handed polarized light, and converts the left-handed polarized light into right-handed polarized light through total internal reflection. The polarization light processor transmits the right-handed polarized light to the human eye through total internal reflection and couples out the right-handed polarized light to form an image.

[0079] The near-eye display method further includes the following steps:

[0080] S11. Emitting right-handed polarized light and left-handed polarized light that are orthogonal to each other.

[0081] S21, diffracting right-handed polarized light and transmitting left-handed polarized light, converting the right-handed polarized light into left-handed deflected light by total reflection, and transmitting the left-handed polarized light to the human eye by total reflection to form an image.

[0082] S31, converting the transmitted left-handed polarized light into right-handed polarized light, converting the right-handed polarized light into left-handed polarized light by total reflection, and conducting the left-handed polarized light to the human eye by total reflection to form an image.

[0083] This step is similar to the steps of the near-eye display method described above, and is not described here.

[0084] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made in the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A waveguide device for improving light efficiency, characterized in that: include: Two polarization light processors for receiving a first polarization light and a second polarization light that are orthogonal to each other, wherein one of the first polarization light and the second polarization light is left-handed polarization light and the other is right-handed polarization light; An intermediate phase modulator (60) is arranged between two polarization light processors, and the intermediate phase modulator (60) is combined with a polarization light processor to convert light transmitted through one polarization light processor into first polarization light, and the converted first polarization light is incident on the other polarization light processor; Wherein, the light emission directions of the second polarized light coupled out of the two polarized light processors are on the same side; The polarized light processor comprises a waveguide substrate, a polarized light coupling-in element arranged on one side of the waveguide substrate surface, a polarized light coupling-out element arranged on the other side of the waveguide substrate surface, and a phase modulation device located on the waveguide substrate surface and arranged opposite to the polarized light coupling-in element. The polarized light coupling-in element receives mutually orthogonal first polarized light and second polarized light and diffracts the first polarized light to form light (202) and transmits the second polarized light to form light (203). The polarized light coupling-out element couples out the light (202) transmitted by total reflection and expands the pupil. The phase modulation device can adjust the phase of the first polarized light so that the first polarized light is converted into the second polarized light when it is reflected and incident on the polarized light coupling-in element and is transmitted in the waveguide substrate. The phase modulation device and the intermediate phase modulation device (60) are both 1 / 4 wave plates.

2. The waveguide device for improving light efficiency according to claim 1, wherein: The polarized light out-coupling element and the polarized light in-coupling element are located on the same surface or opposite surfaces of the waveguide substrate.

3. The waveguide device for improving light efficiency according to claim 1, wherein: Adjacent polarized light processors are arranged relative to each other, and the intermediate phase modulation element (60) is arranged at intervals from the adjacent polarized light processors.

4. The waveguide device for improving light efficiency according to claim 1, wherein: Adjacent polarization light processors are staggered, and a refraction device (101) is further provided between adjacent polarization light processors. The refraction device (101) is used to transmit the second polarization light transmitted through one polarization light processor to another polarization light processor.

5. A near-eye display system, characterized in that: A waveguide device for improving light efficiency according to any one of claims 1 to 4 and The image light output unit (10) is used for emitting the first polarized light and the second polarized light that are orthogonal to each other, wherein one of the first polarized light and the second polarized light is left-handed polarized light and the other is right-handed polarized light.

6. The near-eye display system according to claim 5, wherein: The image light output unit (10) further comprises an image light output module (110), a polarizing device (120), and a phase modulation element (130) with timing control, wherein the image light output module (110) is used to emit non-polarized light, the polarizing device (120) is used to convert the non-polarized light into linearly polarized light, and the phase modulation element (130) is used to convert the linearly polarized light into left-handed polarized light and right-handed polarized light carrying different information.

7. The near-eye display system according to claim 6, wherein: The angle of the light coupled out by one polarized light processor is different from the angle of the light coupled out by another polarized light processor.

8. A near-eye display method, based on the waveguide device for improving light efficiency according to any one of claims 1 to 4, characterized in that: The following steps are involved: Emitting left-hand polarized light and right-hand polarized light that are orthogonal to each other; diffracting left-handed polarized light and transmitting right-handed polarized light, converting the left-handed polarized light into right-handed deflected light through processing, and transmitting the right-handed polarized light to the human eye by total reflection to form an image; Converting the transmitted right-handed polarized light into left-handed polarized light, converting the left-handed polarized light into right-handed polarized light through processing, and transmitting the right-handed polarized light to the human eye by total reflection to form an image; or, Emitting right-handed polarized light and left-handed polarized light that are orthogonal to each other; diffracting right-handed polarized light and transmitting left-handed polarized light, converting the right-handed polarized light into left-handed deflected light through processing, and transmitting the left-handed polarized light to the human eye by total reflection to form an image; The transmitted left-handed polarized light is converted into right-handed polarized light, the right-handed polarized light is processed and converted into left-handed polarized light, and the left-handed polarized light is transmitted to the human eye by total reflection to form an image.

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