CN118226565A - Waveguide device for improving light efficiency, near-eye display system and near-eye display method - Google Patents
Waveguide device for improving light efficiency, near-eye display system and near-eye display method Download PDFInfo
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- CN118226565A CN118226565A CN202410394544.4A CN202410394544A CN118226565A CN 118226565 A CN118226565 A CN 118226565A CN 202410394544 A CN202410394544 A CN 202410394544A CN 118226565 A CN118226565 A CN 118226565A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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Abstract
The application discloses a waveguide device for improving light efficiency, a near-eye display system and a near-eye display method, and belongs to the technical field of waveguide diffraction. The waveguide device for improving the light efficiency comprises two polarized light processors, a first polarization light source and a second polarization light source, wherein the two polarized light processors are used for receiving the first polarized light and the second polarized light which are mutually orthogonal, one of the first polarized light and the second polarized light is left-handed polarized light, and the other one of the first polarized light and the second polarized light 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 converting the coupled first polarized light into the second polarized light and then coupling out; the intermediate phase modulator is arranged between the two polarized light processors, and is combined with one polarized light processor to convert the second polarized light transmitted through the one polarized light processor into the first polarized light and enable the converted first polarized light to be incident into the other polarized light processor; the light emitting 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
The application relates to the technical field of waveguide diffraction, in particular to a waveguide device for improving light efficiency, a near-eye display system and a near-eye display method.
Background
In recent years, the AR field has received more and more attention, and the AR technology is implemented by means of a near-to-eye display device, which can project a virtual image in a real scene, so that the user can feel immersed, and not only can the user experience be improved, but also the productivity can be improved.
Diffraction waveguides, which are important components of AR near-to-eye displays, are considered as an optical solution to consumer-grade AR glasses due to their thinness and high transmission characteristics of ambient light.
In the existing diffraction waveguide, light is greatly lost in the process of coupling light into the waveguide through the coupling grating. As shown in fig. 1, 140 is an incoupling optical element and 150 is a waveguide substrate. The light 160 is diffracted into the waveguide substrate 150 by the incoupling optical element 140, and the angle a should be larger than the critical angle for total reflection of the waveguide substrate 150. The light 160 is totally reflected and transmitted in the waveguide substrate 150, and the light 160 is incident again on the coupling-in optical element 140 after being totally reflected once, and the coupling-in optical element 140 diffracts a large portion of the light out of the waveguide substrate 150, which causes a large light loss.
Disclosure of Invention
In order to reduce light loss and improve waveguide display brightness, the application provides a waveguide device, a near-eye display system and a near-eye display method for improving light efficiency.
The waveguide device for improving the light efficiency adopts the following technical scheme:
First aspect
A waveguide device for improving light efficiency, comprising:
Two polarization light processors for receiving first polarized light and second polarized light 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; the polarized light processor is used for coupling in the first polarized light and transmitting the second polarized light, and converting the coupled first polarized light into the second polarized light and then coupling out;
the intermediate phase modulator is arranged between the two polarized light processors, and is combined with one polarized light processor to convert the second polarized light transmitted through the one polarized light processor into the first polarized light and enable the converted first polarized light to be incident into the other polarized light processor;
The light emitting directions of the second polarized light coupled out by the two polarized light processors are on the same side.
By adopting the technical scheme, the polarized light processor can be coupled into the first polarized light only, and the polarized light processor can convert the first polarized light into the second polarized light, at the moment, the optical element coupled into the first polarized light can not diffract the second polarized light, so that the condition that the coupled first polarized light is diffracted out by the optical element coupled into the first polarized light in the transmission process can be effectively reduced, thereby reducing light loss and improving waveguide display brightness.
Optionally, the polarization light processor includes a waveguide substrate, a polarization light coupling-in element disposed on one side of the surface of the waveguide substrate, a polarization light coupling-out element disposed on the other side of the surface of the waveguide substrate, and a phase modulation device disposed on the surface of the waveguide substrate and opposite to the polarization light coupling-in element, where the phase modulation device can adjust the phase of the first polarization light so that the first polarization light is converted into the second polarization light when incident on the polarization light coupling-in element after being reflected and transmitted in the waveguide substrate.
By adopting the technical scheme, the first polarized light and the second polarized light which are mutually orthogonal are incident to 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 converted into the second polarized light after being totally reflected by the phase modulation device, the second polarized light is incident to the polarized light coupling-in element, and the polarized light coupling-in element only diffracts the first polarized light, so that the second polarized light is continuously transmitted in the waveguide substrate after the polarized light coupling-in element totally reflects. According to the scheme, light is reduced from diffraction of the polarized light coupling-in element, light loss is reduced, and light utilization rate is greatly improved.
Optionally, 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.
By adopting the technical scheme, the propagation direction of the light path is changed according to the requirement, and the adaptability is improved.
Optionally, the phase modulation device and the intermediate phase modulation element are both 1/4 wave plates.
Optionally, the adjacent polarized light processors are arranged oppositely, and the intermediate phase modulator is arranged at intervals between the adjacent polarized light processors.
By adopting the technical scheme, the mode of relative arrangement is favorable for reducing the whole volume of the system, and the interval arrangement ensures the conversion of polarized light.
Optionally, the adjacent polarized light processors are arranged in a staggered manner, and a refraction device is further arranged between the adjacent polarized light processors and is used for transmitting the second polarized light transmitted through one polarized light processor to the other polarized light processor.
By adopting the technical scheme, each polarized light processor can independently process and regulate and control the optical signals by dislocation setting, and the polarized light processors cannot be influenced by adjacent polarized light processors; meanwhile, the dislocation arrangement can avoid direct light path coupling, which is helpful for reducing cross interference between light paths and improving the stability and performance of the system.
Second aspect
A near-eye display system comprises the waveguide device for improving light efficiency and the waveguide device
And an image light output unit for emitting first polarized light and second polarized light 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.
Optionally, the image light output unit further includes an image light output module, a polarizing device, and a phase modulation element with timing control, where the image light output module is configured to emit unpolarized light, the polarizing 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 polarized light and right-handed polarized light carrying different information.
By adopting the technical scheme, light is divided into left-handed polarized light and right-handed polarized light before entering the polarized light coupling-in element, and the left-handed polarized light and the right-handed polarized light respectively carry different image information, and the image information is transmitted through the waveguide substrate and then projected to human eyes.
Optionally, the light coupled out by one of the polarization processors is at a different angle from the light coupled out by the other polarization processor.
Third aspect of the invention
A near-eye display method comprising the steps of:
Emitting a left-handed polarized light and a right-handed polarized light which 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 treatment, and transmitting the right-handed polarized light to human eyes for imaging in a total reflection mode;
Converting the transmitted right-handed polarized light into left-handed deflected light, converting the left-handed polarized light into right-handed deflected light through treatment, and transmitting the right-handed polarized light to human eyes for imaging in a total reflection manner; or alternatively, the first and second heat exchangers may be,
Emitting right-handed polarized light and left-handed polarized light which are mutually orthogonal;
diffracting right-handed polarized light and transmitting left-handed polarized light, converting the right-handed polarized light into left-handed deflected light through treatment, and transmitting the left-handed polarized light to human eyes for imaging in a total reflection manner;
the transmitted left-hand polarized light is converted into right-hand deflected light, which is processed to convert the right-hand polarized light into left-hand deflected light, which is totally reflected to be transmitted to the human eye for imaging.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the application can reduce light loss and greatly improve the light utilization rate.
2. The adjacent polarized light processors are arranged in a staggered manner, so that each polarized light processor can independently process and regulate optical signals without being influenced by the adjacent polarized light processors; meanwhile, the dislocation arrangement can avoid direct light path coupling, which is helpful for reducing cross interference between light paths and improving the stability and performance of the system.
3. Before the incident polarized light is coupled into the element, the light is divided into left-handed polarized light and right-handed polarized light, the left-handed polarized light and the right-handed polarized light respectively carry different image information, and the image information is transmitted through the waveguide substrate and then projected to human eyes.
Drawings
Fig. 1 is a schematic diagram of a conventional diffraction waveguide.
Fig. 2 is a schematic structural diagram of a near-eye display system according to an embodiment of the application.
Fig. 3 is a schematic diagram of a structure including a refractive device in a near-eye display system.
Fig. 4 is a schematic structural diagram of another embodiment of the near-eye display system of the present application.
Reference numerals illustrate:
10. An image light output unit; 20. a first waveguide substrate; 30. a first polarized light incoupling element; 40. a first polarized light outcoupling element; 50. a first phase modulation device; 60. an intermediate phase modulator; 70. a second waveguide substrate; 80. a second polarized light incoupling element; 90. a second polarized light outcoupling element; 100. a second phase modulation device; 101. a refractive device; 110. an image light output module; 120. a polarizing device; 130. a phase modulating element.
Detailed Description
The application is described in further detail below with reference to fig. 1-4.
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. The same reference numerals will be used throughout the drawings to refer to the same or like parts, if possible, and detailed description thereof may be omitted.
Furthermore, in the present disclosure, the disclosed embodiments and features of the disclosed embodiments may be combined. The embodiments described above are some, but not all, embodiments of the invention. Based on the disclosed embodiments, one of ordinary skill in the art may derive other embodiments consistent with the present disclosure. For example, modifications, adaptations, substitutions, additions, or other variations may be made based on the disclosed embodiments. Such variations of the disclosed embodiments are still within the scope of the present disclosure. Thus, the present disclosure is not limited to the disclosed embodiments. Rather, the scope of the present disclosure is defined by the appended claims.
As used herein, the term "couple (couple, coupled, coupling)" or 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 may be received directly or indirectly by the other optical element. An optical train refers to the optical positioning of a plurality of optical elements in an optical path such that light output from one optical element may be transmitted, reflected, diffracted, converted, modified, or otherwise processed or manipulated by one or more other optical elements. In some embodiments, the sequence of arranging the plurality of optical elements may or may not affect the overall output of the plurality of optical elements. The coupling may be direct coupling or indirect coupling (e.g., via an intermediate element).
The embodiment of the application discloses a waveguide device for improving light efficiency. Referring to fig. 2, in one embodiment, the waveguide device for improving light efficiency includes two polarization processors for receiving first polarized light and second polarized light 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; the polarization processor is used for coupling in the first polarized light and transmitting the second polarized light, and converting the coupled-in first polarized light into the second polarized light and then coupling out.
An intermediate phase modulator 60 is disposed between the two polarization processors, the intermediate phase modulator 60 being used in combination with one polarization processor to convert the second polarized light transmitted through the one polarization processor into the first polarized light and to cause the first polarized light to be incident on the other polarization processor. The light emitting directions of the second polarized light coupled out by the two polarized light processors are on the same side.
For convenience of description and understanding, in an embodiment, a polarization processor includes a first waveguide substrate 20, a first polarization coupling-in element 30 disposed on one side of a surface of the first waveguide substrate 20, a first polarization coupling-out element 40 disposed on the other side of the surface of the first waveguide substrate 20, and a first phase modulation device 50 disposed on the surface of the first waveguide substrate 20 opposite to the first polarization coupling-in element 30, where the first phase modulation device 50 can adjust a phase of the first polarization so that the first polarization is converted into a second polarization when being reflected and incident on the first polarization coupling-in element 30, and is transmitted in the first waveguide substrate 20.
The other polarization light processor includes a second waveguide substrate 70, a second polarization light coupling-in element 80 disposed on one side of the surface of the second waveguide substrate 70, a second polarization light coupling-out element 90 disposed on the other side of the surface of the second waveguide substrate 70, and a second phase modulation device 100 disposed on the surface of the second waveguide substrate 70 and opposite to the second polarization light coupling-in element 80, wherein the second phase modulation device 100 can adjust the phase of the first polarization light so that the first polarization light is converted into the second polarization light when being incident on the second polarization light coupling-in element 80 after being reflected and transmitted in the second waveguide substrate 70.
The first polarized light in-coupling element 30 and the second polarized light in-coupling element 80 are polarization sensitive diffractive optical elements, which may be surface relief gratings or volume holographic gratings, and the first polarized light out-coupling element 40 and the second polarized light out-coupling element 90 are polarization sensitive diffractive optical elements or non-polarization sensitive diffractive optical elements, which may be surface relief gratings or volume holographic gratings.
In a preferred embodiment, the first polarized light is left-handed polarized light, the second polarized light is right-handed polarized light, the first polarization incoupling element 30 is a first left-handed 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.
At this time, the first left-handed holographic grating receives the left-handed polarized light and the right-handed polarized light which are orthogonal to each other, the first left-handed holographic grating diffracts the left-handed polarized light to form light 202 and transmits the right-handed polarized light to form light 203, the angle of incidence of the light 202 on the first waveguide substrate 20 is larger than the total reflection critical angle of the first waveguide substrate 20, the light 202 is transmitted in the first waveguide substrate 20 in a total reflection manner, after the light 202 is totally reflected at the 1/4 wave plate, the light 202 has a half-wavelength phase difference, and the light 202 is changed from the left-handed polarized light to the right-handed polarized light. When the light ray 202 is incident on the first left-handed polarization hologram again, the light ray 202 is totally reflected when it is incident on the first left-handed polarization hologram, but is not diffracted at the first left-handed polarization hologram, since the first left-handed polarization hologram only diffracts the left-handed polarized light and does not act on the right-handed polarized light. Thus, the light 202 is totally reflected and transmitted in the first waveguide substrate 20, and the light 202 totally reflected and transmitted is coupled out and pupil-expanded by the first polarization coupling-out element 40.
The light ray 203 sequentially passes through the first phase modulation device 50 and the intermediate phase modulation element 60, generating a phase difference of half a wavelength, and the light ray 203 is converted from right-handed polarized light to left-handed polarized light. The light ray 203 is incident on the second left-handed polarization hologram grating, the second left-handed polarization hologram grating diffracts the left-handed polarized light, and the angle of the light ray 203 after being diffracted by the second left-handed polarization hologram grating is larger than the critical angle of total reflection of the second waveguide substrate 70, and is transmitted in the second waveguide substrate 70 in a total reflection manner. After the light ray 203 is totally reflected at the second phase modulation device 100, the light ray 203 has a phase difference of half a wavelength, and the light ray 203 is changed from the left-handed polarized light to the right-handed polarized light. When the light ray 203 is incident on the second left-handed polarization holographic grating again, the light ray 203 is incident on the second left-handed polarization holographic grating and is not diffracted at the second left-handed polarization holographic grating, because the second left-handed polarization holographic grating only diffracts the left-handed polarized light and does not act on the right-handed polarized light. The second polarized light outcoupling element 90 outcouples the light 203 transmitted by total reflection and expands the pupil.
Thus, the light is not diffracted by the coupling-in element, but is totally reflected at the coupling-in element. Therefore, light loss is avoided, and the light utilization rate is greatly improved.
In this embodiment, the polarizing light coupling-out element and the polarizing light coupling-in element are located on the same surface of the waveguide substrate, and in another embodiment, the polarizing light coupling-out element and the polarizing light coupling-in element may also be located on opposite surfaces of the waveguide substrate.
Referring to fig. 2, in one embodiment, two polarization processors are disposed opposite to each other, and an intermediate phase modulator 60 is disposed at a distance from the two polarization processors. At this time, the first phase modulation device 50 is attached to the surface of the first waveguide substrate 20, no air layer exists between the first phase modulation device 50 and the first waveguide substrate 20, the second phase modulation device 100 is attached to the surface of the second waveguide substrate 70, and no air layer exists between the second phase modulation device 100 and the second waveguide substrate 70; the intermediate phase modulator 60 has an air layer between the first phase modulation device 50 and the second polarization incoupling element 80. The air layer can reduce the transmission loss of light and improve the transmission efficiency of optical signals. The presence of an intermediate air layer may simplify the coupling structure and design between devices, making the fabrication and tuning of the devices easier.
Referring to fig. 3, in another embodiment, two polarization light processors are arranged in a staggered manner, and a refraction device 101 is further arranged between two adjacent polarization light processors, where the refraction device 101 is used for transmitting the second polarized light transmitted through one polarization light processor to the other polarization light processor. In some embodiments, the refractive device 101 may be a refractive prism combination or a fiber optic coupler. The dislocation arrangement enables each polarized light processor to independently process and regulate the optical signals without being influenced by adjacent polarized light processors; meanwhile, the dislocation arrangement can avoid direct light path coupling, which is helpful for reducing cross interference between light paths and improving the stability and performance of the system.
The embodiment of the application also discloses a near-eye display system, which comprises the waveguide device for improving the light efficiency and an image light output unit 10, wherein the image light output unit 10 is used for emitting first polarized light and second polarized light which are mutually orthogonal, one of the first polarized light and the second polarized light is left-handed polarized light, and the other is right-handed polarized light.
In an embodiment, the light emitted from the image light output unit 10 is unpolarized light, and the unpolarized light can be decomposed into left-handed polarized light and right-handed polarized light which are orthogonal to each other.
The image light output unit 10 may comprise, 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 may 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 superluminescent diode ("SLED") scanning projector, or a combination thereof. In some embodiments, the image light output unit 10 may be a self-luminous panel, such as an OLED display panel or a micro-LED display panel. In some embodiments, the image light output unit 10 may 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 may include a laser, an LED, an OLED, or a combination thereof.
Referring to fig. 4, in another embodiment, the image light output unit 10 further includes an image light output module 110, a polarizing device 120, and a phase modulation element 130 with timing control, where the image light output module 110 emits unpolarized light, the unpolarized light is changed into linearly polarized light after passing through the polarizing device 120, the phase modulation element 130 may be an electronically controlled liquid crystal 1/4 wave plate, the electronically controlled liquid crystal 1/4 wave plate has two phase states, the phase state 1 may convert the linearly polarized light into left-handed polarized light, the phase state 2 may convert the linearly polarized light into right-handed polarized light, the two phase states are switched at a certain frequency, the linearly polarized light is separated into the left-handed polarized light and the right-handed polarized light after passing through the electronically controlled liquid crystal 1/4 wave plate, and the light beam is composed of the left-handed polarized light and the right-handed polarized light. For example, the image signal carried by the linearly polarized light is 120Hz, the switching frequency of the electrically controlled liquid crystal 1/4 wave plate in two phase states is 60Hz, and the image signals carried by the left-hand polarized light and the right-hand polarized light are 60Hz.
At this time, the left-hand polarized light and the right-hand polarized light carry two different image information respectively, and the left-hand polarized light and the right-hand polarized light are coupled in and coupled out by the deflection light processor in sequence according to the principle, and finally transmitted into the human eyes. The first polarization light outcoupling element 40 outcouples and pupil-expands the light 202 transmitted by total reflection, and the second polarization light outcoupling element 90 outcouples and pupil-expands the light 203 transmitted by total reflection. The light coupled out by the first polarized light outcoupling element 40 is in a different direction than the light coupled out by the second polarized light outcoupling element 90, thus extending the angle of view. The scheme not only can increase the utilization efficiency of light, but also can expand the angle of view.
The embodiment of the application also discloses a near-eye display method. The method comprises the following steps:
s10, emitting left-handed polarized light and right-handed polarized light which are mutually orthogonal.
S20, diffracting the left-handed polarized light and transmitting the right-handed polarized light, converting the left-handed polarized light into right-handed polarized light after treatment, and transmitting the right-handed polarized light to human eyes for imaging in a total reflection mode.
S30, converting the transmitted right-handed polarized light into left-handed deflected light, converting the left-handed polarized light into right-handed deflected light after treatment, and conducting the right-handed polarized light to human eyes for imaging in a total reflection mode.
Wherein, step S10 may include:
S101, unpolarized light is emitted from the image light output unit 10, and the unpolarized light can be decomposed into left-handed polarized light and right-handed polarized light which are orthogonal to each other and carry the same information.
In other embodiments, the step S10 may also include:
s102, the image light output unit 10 emits unpolarized light, and the unpolarized light is converted into left-handed polarized light and right-handed polarized light carrying different image information after passing through the polarizing device 120 and the phase modulation element 130.
In an embodiment, step S20 may include:
s201, diffraction of left-handed polarized light and transmission of right-handed polarized light by a polarization processor, transformation of left-handed polarized light into right-handed deflected light by a polarization processor through total reflection, total reflection conduction of right-handed polarized light by the polarization processor and coupling out of right-handed polarized light to human eyes for imaging.
In an embodiment, step S30 may include:
S301, converting the right-hand polarized light transmitted by the last polarized light processor into left-hand deflection light by the other polarized light processor, converting the left-hand polarized light into right-hand deflection light through total reflection, and transmitting the right-hand polarized light to and coupling out the right-hand polarized light from the polarized light processor through total reflection for imaging.
The near-eye display method further comprises the following steps:
s11, emitting right-handed polarized light and left-handed polarized light which are mutually orthogonal.
S21, diffracting the right-handed polarized light and transmitting the left-handed polarized light, converting the right-handed polarized light into left-handed polarized light through total reflection, and transmitting the left-handed polarized light to the human eye for imaging through total reflection.
S31, converting the transmitted left-handed polarized light into right-handed deflected light, converting the right-handed polarized light into left-handed deflected light through total reflection, and conducting the left-handed polarized light to the human eye for imaging through total reflection.
This step is similar to the above-described near-eye display method, and will not be described here.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. A waveguide device for improving light efficiency, comprising:
Two polarization light processors for receiving first polarized light and second polarized light 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; the polarized light processor is used for coupling in the first polarized light and transmitting the second polarized light, and converting the coupled first polarized light into the second polarized light and then coupling out;
The intermediate phase modulator (60) is arranged between the two polarized light processors, and the intermediate phase modulator (60) is combined with one polarized light processor to convert the second polarized light transmitted through the one polarized light processor into the first polarized light and enable the converted first polarized light to be incident into the other polarized light processor;
The light emitting directions of the second polarized light coupled out by the two polarized light processors are on the same side.
2. A light efficiency enhancing waveguide device as recited in claim 1, wherein the polarization processor comprises a waveguide substrate, a polarization light coupling-in element disposed on one side of the surface of the waveguide substrate, a polarization light coupling-out element disposed on the other side of the surface of the waveguide substrate, and a phase modulation device disposed on the surface of the waveguide substrate opposite to the polarization light coupling-in element, the phase modulation device being capable of adjusting the phase of the first polarized light so that the first polarized light is converted into the second polarized light when incident on the polarization light coupling-in element after reflection and transmitted in the waveguide substrate.
3. A light efficiency enhancing waveguide device as claimed in claim 2, wherein: the polarized light coupling-out element and the polarized light coupling-in element are positioned on the same surface or opposite surfaces of the waveguide substrate.
4. A light efficiency enhancing waveguide device as claimed in claim 2, wherein: the phase modulation device and the intermediate phase modulation element (60) are both 1/4 wave plates.
5. A light efficiency enhancing waveguide device as claimed in claim 1, wherein: the adjacent polarized light processors are oppositely arranged, and the intermediate phase modulator (60) is arranged at intervals between the adjacent polarized light processors.
6. A light efficiency enhancing waveguide device as claimed in claim 1, wherein: the adjacent polarized light processors are arranged in a staggered mode, a refraction device (101) is further arranged between the adjacent polarized light processors, and the refraction device (101) is used for transmitting second polarized light transmitted through one polarized light processor to the other polarized light processor.
7. A near-eye display system comprising the light efficiency enhancing waveguide device of any one of claims 1-6 and
An image light output unit (10) for emitting the first polarized light and the second polarized light 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.
8. The near-eye display system of claim 7, 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 for emitting unpolarized light, the polarizing device (120) is used for converting the unpolarized light into linearly polarized light, and the phase modulation element (130) is used for converting the linearly polarized light into left-handed polarized light and right-handed polarized light carrying different information.
9. The near-eye display system of claim 8, wherein: the angle of the light coupled out by one polarized light processor is different from that of the light coupled out by the other polarized light processor.
10. A near-eye display method, comprising the steps of:
Emitting a left-handed polarized light and a right-handed polarized light which 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 treatment, and transmitting the right-handed polarized light to human eyes for imaging in a total reflection mode;
Converting the transmitted right-handed polarized light into left-handed deflected light, converting the left-handed polarized light into right-handed deflected light through treatment, and transmitting the right-handed polarized light to human eyes for imaging in a total reflection manner; or alternatively, the first and second heat exchangers may be,
Emitting right-handed polarized light and left-handed polarized light which are mutually orthogonal;
diffracting right-handed polarized light and transmitting left-handed polarized light, converting the right-handed polarized light into left-handed deflected light through treatment, and transmitting the left-handed polarized light to human eyes for imaging in a total reflection manner;
the transmitted left-hand polarized light is converted into right-hand deflected light, which is processed to convert the right-hand polarized light into left-hand deflected light, which is totally reflected to be transmitted to the human eye for imaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410394544.4A CN118226565A (en) | 2024-04-02 | 2024-04-02 | Waveguide device for improving light efficiency, near-eye display system and near-eye display method |
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| CN118426192A (en) * | 2024-07-05 | 2024-08-02 | 南昌虚拟现实研究院股份有限公司 | Holographic optical waveguide color display system |
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| CN118426192A (en) * | 2024-07-05 | 2024-08-02 | 南昌虚拟现实研究院股份有限公司 | Holographic optical waveguide color display system |
| CN118426192B (en) * | 2024-07-05 | 2024-10-01 | 南昌虚拟现实研究院股份有限公司 | Holographic optical waveguide color display system |
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