CN110687678B

CN110687678B - Display module based on waveguide, image generation module and application thereof

Info

Publication number: CN110687678B
Application number: CN201810794131.XA
Authority: CN
Inventors: 宋海涛; 周旭东; 姚长呈; 王佳舟
Original assignee: Chengdu Idealsee Technology Co Ltd
Current assignee: Chengdu Idealsee Technology Co Ltd
Priority date: 2018-07-06
Filing date: 2018-07-19
Publication date: 2022-03-08
Anticipated expiration: 2038-07-19
Also published as: CN110687678A

Abstract

The invention discloses a waveguide-based display module and a corresponding image generation module thereof, wherein based on the wavelength division multiplexing principle, an image generation unit modulates a mixed light beam containing at least two groups of subimages with different wavelengths; and coupling the mixed light beams modulated by the image generation unit into a waveguide module, wherein the waveguide module is provided with a plurality of layers of coupling-in units and a plurality of layers of coupling-out units, each layer of coupling-in unit is configured to couple in light with different wavelength ranges, and emergent images of the mixed light beams of the images to be displayed generated by the image generation unit after being coupled out by the coupling-out units of the waveguide module are spliced into the images to be displayed. The invention solves the problems of large view field and miniaturization of the near-to-eye display module by a brand-new thought.

Description

Display module based on waveguide, image generation module and application thereof

Technical Field

The invention relates to the technical field of display, in particular to an optical fiber scanning module, a flat panel display screen, an MEMS (micro-electromechanical systems) scanning module, a waveguide-based display module and display equipment.

Background

The existing near-to-eye display module applied to the field of Augmented Reality (AR) mostly has the problem that the field angle is not large, and the display module based on the waveguide in the prior art is taken as an example: conventional waveguide-based display modules typically include an image source 1, an eyepiece system 2, an incoupling grating 3, a waveguide 4, and an outcoupling grating 5, as shown in fig. 1. After being collimated by the ocular lens system 2, light beams emitted by the image source 1 are coupled into the waveguide 4 at a certain angle through the coupling grating 3 for total reflection transmission, and the light beams transmitted in the waveguide are coupled out to human eyes by the coupling grating 5 arranged in the waveguide corresponding to the exit pupil position. Since the grating is a very incident angle sensitive element, for the coupled grating, the diffraction efficiency and angle of the light incident on the grating are different, and the maximum diffraction efficiency is obtained at a specific incident angle, and when the incident angle deviates from the specific incident angle, the diffraction efficiency is rapidly reduced (i.e. the grating hardly diffracts the incident light at this angle and is nearly transmitted into the grating), as shown in fig. 2, the abscissa of the diffraction efficiency distribution graph of the coupled grating is the angle of the light incident on the grating, the ordinate is the diffraction efficiency of the grating, and the effective diffraction angle bandwidth of the grating shown in the graph is ± 20 °. The light beam transmission diagram shown in fig. 3, wherein ray 1 represents the diffraction path of-20 ° incident light, ray 2 represents the diffraction path of 0 ° incident light, and ray 3 represents the diffraction path of +20 ° incident light; the light 1, the light 2 and the light 3 are coupled into the waveguide for total reflection transmission, and then are coupled out of the waveguide through the coupling grating to be presented to human eyes. Other angles of incident light (i.e. beyond 20 °) have very low diffraction efficiency and the light is nearly transmitted through the grating without any change in angle, as shown by the light 4, which, although it can also be transmitted totally internally in the waveguide, is not diffracted by the outcoupling grating and cannot be outcoupled to the human eye in the waveguide. Therefore, the human eye can observe only a field angle of ± 20 °.

In chinese patent CN107024769, we can see that the field angle is enlarged by applying a splicing method in the prior art, and this splicing method needs to add a group of corresponding input light source modules every time a group of field angles is added, and belongs to hardware stacking type splicing.

How to solve the problem of considering both large visual field and miniaturization of a near-eye display module is a technical problem to be solved urgently in the field.

Disclosure of Invention

The invention aims to provide a series of waveguide-based display modules and corresponding image generation modules based on a brand-new thought, and solves the problem of large view field and miniaturization of a near-eye display module.

In order to achieve the above object, the present invention provides an optical fiber scanning module, which includes an optical fiber scanner and an input light source, wherein the optical fiber scanner includes at least one scanning optical fiber; one path of the input light source comprises N groups of light sources, each group of light source at least comprises R, G, B light-emitting units, the light-emitting units of the same color channel in the N groups of light sources are configured to emit light with different wavelengths, and N is an integer greater than or equal to 2.

Preferably, the light beams generated by N groups of light sources in the input light source are combined and input into one scanning optical fiber in the optical fiber scanner.

Preferably, one scanning optical fiber corresponds to one path of input light source, and when the optical fiber scanner includes more than two optical fibers, the wavelength configuration of the input light source corresponding to each scanning optical fiber is the same.

Preferably, N groups of light sources in the one path of input light source are N groups of laser tube light sources or N groups of LED light sources.

Preferably, said N is equal to 2.

Correspondingly, the invention also provides a flat panel display screen, each pixel of the flat panel display screen comprises at least two groups of sub-pixels, each group of sub-pixels comprises R, G, B three color units, and the same color units in each group of sub-pixels adopt different wavelengths.

Preferably, the flat panel display screen is one of a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED) display screen, a liquid crystal silicon Liquid Crystal On Silicon (LCOS) display screen and a Digital Light Processing (DLP) display screen.

Correspondingly, the invention also provides an MEMS scanning module, which includes an MEMS scanner and a light source, where the light source includes N groups of light sources, each group of light source includes at least R, G, B three light-emitting units, the light-emitting units with the same color channel in the N groups of light sources are configured to emit light with different wavelengths, and N is an integer greater than or equal to 2.

Preferably, the light beams emitted by the N groups of light sources are combined and then emitted to the MEMS scanner.

Preferably, the N groups of light sources in the light-emitting light sources are N groups of laser tube light sources or N groups of LED light sources.

Correspondingly, the invention also provides a display module based on the waveguide, which comprises:

the image segmentation unit is used for segmenting an image to be displayed into M sub-images, wherein M is an integer greater than or equal to 2;

the image generation unit comprises one or more image generation subunits, and when the image generation unit comprises at least two image generation subunits, the light-emitting wavelength configurations of the image generation subunits are the same; each image generation subunit modulates mixed light beams of N sub-images in a wavelength division multiplexing mode, the same color light beams in the N sub-image light beams generated by each image generation subunit have different wavelengths, and N is an integer greater than or equal to 2; the image generation unit simultaneously modulates and emits the M sub-images through one or more image generation sub-units, and forms a mixed beam of an image to be displayed, which comprises the M sub-image beams, after the mixed beam is collimated by a collimating optical system;

the waveguide module is arranged on the light outgoing path of the image generation unit and is provided with a plurality of layers of coupling-in units and a plurality of layers of coupling-out units, each layer of coupling-in unit is configured to couple in light with different wavelength ranges, and emergent images of mixed light beams of images to be displayed, which are generated by the image generation unit and are coupled out by the coupling-out units of the waveguide module, are spliced into the images to be displayed.

Preferably, when the image generating unit modulates and emits the M sub-images simultaneously through the plurality of image generating sub-units, the light beams of the plurality of image generating sub-units are spliced with each other before being incident on the waveguide module.

One preferred mode is as follows: when each sub-image is modulated by R, G, B three light-emitting units, the waveguide module comprises 3 × N layers of coupling-in units and 3 × N layers of coupling-out units, except the last layer of coupling-in unit, each other layer of coupling-in units is configured to couple in only one wavelength of the mixed light beam of the image to be displayed, and the coupling-in unit is a reflective grating or a filter.

Another preferred mode is as follows: the waveguide module comprises N layers of stacked waveguide substrates, when each sub-image is modulated by R, G, B three light-emitting units, except the last coupling-in unit of the N layers of stacked waveguide substrates, the coupling-in units of each other layer of waveguide substrate are optical filters, and each optical filter is designed to reflect RGB three-band light corresponding to the sub-image light beams and transmit other band light.

Another preferred mode is as follows: when each sub-image is modulated by R, G, B three light-emitting units, the waveguide module comprises 3 × N coupling-in units and 3 × N coupling-out units, and except the last coupling-in unit, the other coupling-in units adopt long-wave pass filters or short-wave pass filters; when the coupling-in units all adopt long-wave pass filters, the cut-off wavelengths of the long-wave pass filters from the first layer of coupling-in units to the penultimate coupling-in units are gradually increased, and when the coupling-in units all adopt short-wave pass filters, the cut-off wavelengths of the short-wave pass filters from the first layer of coupling-in units to the penultimate coupling-in units are gradually decreased; each layer of coupling-in units couples in only one wavelength of the mixed light beam of the image to be displayed.

Preferably, the coupling-out unit is a coupling-out grating or a coupling-out mirror array.

Preferably, each group of waveguide substrates is provided with a relay unit for expanding the pupil in a direction perpendicular to the expanding pupil direction of the coupling-out unit.

Preferably, adjacent sub-images in the plurality of sub-images divided by the image dividing unit have the same image area.

Preferably, the image generating unit is the aforementioned optical fiber scanning module.

Preferably, the image generating subunit is the aforementioned flat panel display screen, or the aforementioned MEMS scanning module.

Correspondingly, the invention also provides a display device which comprises at least one group of the waveguide-based display module.

Compared with the prior art, the invention has the following beneficial effects:

the optical fiber scanning module, the flat panel display screen, the MEMS scanning module and the waveguide-based display module adopt a wavelength division multiplexing mode, the number of scanning optical fibers can be reduced under the condition of realizing the same resolution and the same field angle, and the miniaturization production of near-eye display equipment is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise:

FIG. 1 is a schematic diagram of a near-eye display module in the field of augmented reality in the prior art;

FIG. 2 is a graph illustrating diffraction efficiency distribution of the in-coupling grating of the near-eye display module shown in FIG. 1;

FIG. 3 is a diagram illustrating transmission paths of light beams with different angles in the near-eye display module shown in FIG. 1;

fig. 4A is a schematic structural diagram of an optical fiber scanning module according to an embodiment of the present invention;

FIG. 4B is a schematic structural diagram of another fiber scanning module according to an embodiment of the present invention;

FIG. 4C is a schematic structural diagram of another fiber scanning module according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a waveguide-based display module according to an embodiment of the present disclosure;

FIG. 6A is a schematic structural diagram of another waveguide-based display module according to an embodiment of the present disclosure;

FIG. 6B is a schematic diagram showing the reflection efficiency of the R1 incoupling unit of the display module shown in FIG. 6A;

FIG. 6C is a schematic structural diagram of a waveguide module in the display module shown in FIG. 6A;

FIG. 6D is a schematic view of another structure of the waveguide module in the display module shown in FIG. 6A;

FIG. 6E is a schematic view of another structure of the waveguide module in the display module shown in FIG. 6A;

FIG. 6F is a schematic diagram showing the reflection efficiency of the B2 incoupling unit in the display module shown in FIG. 6A;

FIG. 7A is a schematic structural diagram of another waveguide-based display module according to an embodiment of the present disclosure;

FIG. 7B is a graph of the reflection efficiency of the filter of the display module shown in FIG. 7A;

FIG. 8 is a schematic structural diagram of another waveguide-based display module according to an embodiment of the disclosure;

fig. 9A is a schematic structural diagram of a flat panel display screen according to an embodiment of the present invention;

FIG. 9B is a schematic structural diagram of another flat panel display panel according to an embodiment of the present invention;

FIG. 10 is a schematic view of another structure of a waveguide-based display module according to an embodiment of the present disclosure;

fig. 11A is a schematic structural diagram of an MEMS scanning module according to an embodiment of the disclosure;

FIG. 11B is a schematic structural diagram of another MEMS scanning module disclosed in the present application;

fig. 12 is a schematic structural diagram of a waveguide-based display module according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a series of display modules based on waveguide based on the thought of wavelength division multiplexing, and image generation modules corresponding to the display modules and application of the display modules.

The display module based on the waveguide mainly comprises an image segmentation unit, an image generation unit and a waveguide module, wherein the image segmentation unit is used for segmenting an image to be displayed into M sub-images, and M is an integer greater than or equal to 2; the image generation unit comprises one or more image generation subunits, and when the image generation unit comprises at least two image generation subunits, the light-emitting wavelength configurations of the image generation subunits are the same; each image generation subunit modulates mixed light beams of N sub-images in a wavelength division multiplexing mode, the same color light beams in the N sub-image light beams generated by each image generation subunit have different wavelengths, and N is an integer greater than or equal to 2; the image generation unit simultaneously modulates and emits the M sub-images through one or more image generation sub-units, and forms a mixed beam of an image to be displayed, which comprises the M sub-image beams, after the mixed beam is collimated by a collimating optical system; the waveguide module is arranged on the light-emitting path of the image generating unit and is provided with a plurality of layers of coupling-in units and a plurality of layers of coupling-out units, each layer of coupling-in unit is configured to couple in light with different wavelength ranges, the positions of the coupling-out units are correspondingly arranged according to the coupling-in conditions of the coupling-in units, and the coupling-in units and the coupling-out units are matched together, so that emergent images generated by the image generating unit and generated by the image mixed light beams to be displayed after being coupled out by the waveguide module coupling-out units are spliced into the images to be displayed.

In the embodiment of the present invention, the image generating unit may be an optical fiber scanning module based on a special structure, or may be an MEMS scanning module based on a special structure, or a flat panel display based on a special structure, and as long as the light emitting source can adopt a wavelength division multiplexing mode, multiple pixel light information including multiple sub-images in the same pixel light spot emitted by the light emitting source can be used as the image generating unit in the embodiment of the present invention.

In the following, we will describe the solution of the invention in terms of several groups of embodiments in conjunction with the accompanying drawings. In the introduction process, in order to avoid excessive repeated parts of the specification, common image generation units are introduced independently and sequentially; although the waveguide-based display module relates to a plurality of embodiment groups, since only the image generating unit is changed, one of the embodiment groups is taken as a detailed description (the embodiment group with the optical fiber scanning module as an image source is selected for detailed description), and the other embodiment groups refer to the embodiment group for description.

Fiber scanning module embodiment:

the embodiment of the invention discloses an optical fiber scanning module, which comprises an optical fiber scanner and an input light source. Wherein the fiber scanner comprises at least one scanning fiber, wherein the fiber scanner comprises at least one actuator (such as a piezoelectric actuator), each actuator driving one or more scanning fibers; one scanning optical fiber corresponds to one path of input light source, wherein the input light source can be a laser light source or other light sources such as a Light Emitting Diode (LED) and the like; one path of the input light source comprises N groups of light sources, each group of light sources at least comprises R, G, B three light-emitting units, one light-emitting unit can comprise a plurality of light-emitting devices, for example, an R light-emitting unit can be formed by mixing two light-emitting devices R 'and R', and when each light-emitting unit comprises a plurality of light-emitting devices, light energy can be improved. Preferably, when the optical fiber scanner includes more than two optical fibers, the wavelength configuration of the input light source corresponding to each scanning optical fiber is the same.

Fig. 4A illustrates an example where the fiber scanning module 100 includes a brake 110, and the brake 110 drives a scanning fiber 111. In fig. 4A, one input light source includes N groups of laser light sources 120, each group of laser light sources includes R, G, B three monochromatic lasers (R, G, B refers to red, green, and blue lasers, respectively), and the N monochromatic lasers of the same color channel in the N groups of laser light sources are configured to emit light with different wavelengths; light generated by N groups of laser light sources is input into one scanning optical fiber 111 in the optical fiber scanner 100, where N is an integer greater than or equal to 2. The light generated by the N groups of laser light sources is preferably input into one scanning optical fiber in the optical fiber scanner after being combined. The combined beam may be a combined beam of red light, green light and blue light generated by R, G, B monochromatic lasers in a single group of laser light sources, or a combined beam of all lights of N groups of laser light sources, or both of the two combined beams, which is not limited herein.

The N monochromatic lasers of the same color channel in the N groups of laser light sources are configured to emit light of different wavelengths, and taking a red monochromatic laser as an example, the R1 monochromatic laser, R2 monochromatic laser … … Rn monochromatic laser shown in fig. 4A all generate red light, but generate red light of different wavelengths. Similarly, the G1 monochromatic laser and the G2 monochromatic laser … … Gn monochromatic laser generate green light, but generate green light with different wavelengths; the B1 and B2 … … Bn monochromatic lasers both produce blue light, but produce blue light of different wavelengths.

In the following, for example, one input light source includes 2 groups of laser light sources, as shown in fig. 4B, the optical fiber scanning module 200 includes an input light source 220 including 2 groups of laser light sources 221 and 222, the first group of laser light source 221 includes three monochromatic lasers R1, G1, and B1, the second group of laser light source 222 includes three monochromatic lasers R2, G2, and B2, the central wavelength difference of two monochromatic lasers with the same color channel in the two groups of laser light sources is preferably in the range of 5nm to 30nm, for example, in fig. 4B, the wavelength of each laser can be configured as follows: the emergent wavelength of the red laser R1 is 650nm, the emergent wavelength of the green laser G1 is 530nm, and the emergent wavelength of the blue laser B1 is 460 nm; the emission wavelength of the red laser R2 is 635nm, the emission wavelength of the green laser G2 is 520nm, and the emission wavelength of the blue laser B2 is 450 nm. The two groups of laser light sources 221 and 222 are both input into the scanning fiber 211 in the fiber scanner 210, so that each pixel point scanned by the scanning fiber 211 carries two parts of light information emitted by the first group of laser light source 221 and the second group of laser light source 222.

Fig. 4C illustrates an example where the fiber scanner 300 includes 3

actuators

310, 320, and 330, and the

actuators

310, 320, and 330 respectively drive one

scanning fiber

311, 321, and 331. The input light source 340 in the figure includes 6 sets of laser

light sources

341 and 346. Wherein, the light beams generated by the

laser sources

341 and 342 are inputted into the scanning fiber 311 driven by the actuator 310, the light beams generated by the

laser sources

343 and 344 are inputted into the scanning fiber 321 driven by the actuator 320, and the light beams generated by the

laser sources

345 and 346 are inputted into the scanning fiber 331 driven by the actuator 330. The laser light source 341 includes three monochromatic lasers R1, G1 and B1, the laser light source 342 includes three monochromatic lasers R2, G2 and B2, and two monochromatic lasers with the same color channel in the two groups of laser light sources emit light with different wavelengths. The input light source wavelength configurations corresponding to the

other scanning fibers

321 and 331 are the same as those of the scanning fiber 311.

A first set of embodiments of a waveguide-based display module (the image generation unit being a fiber scanning module):

the embodiment of the invention also discloses a display module based on the waveguide, which is characterized by comprising the following components: image segmentation unit, image generation unit and waveguide module, wherein:

the image segmentation unit is used for segmenting an image to be displayed into M sub-images, wherein M is an integer greater than or equal to 2; the M sub-images may be understood as M different field angle sub-images;

the image generation unit is an optical fiber scanning module in the embodiment of the optical fiber scanning module, the optical fiber scanning module modulates a mixed light beam containing N sub-images for one scanning optical fiber in a wavelength division multiplexing mode, and N is an integer greater than or equal to 2; and the optical fiber scanning module simultaneously modulates and emits the M sub-images through one or more scanning optical fibers, and forms a mixed light beam of an image to be displayed after the mixed light beam passes through a collimating optical system. When the optical fiber scanning module modulates and emits the M sub-images simultaneously through one scanning optical fiber, wherein M is equal to N; and when the optical fiber scanning module modulates and emits the M sub-images simultaneously through a plurality of scanning optical fibers, M is larger than N. The collimating optical system may be an independent module, and is placed on the light-emitting path of the light-emitting unit, or the collimating optical system may be packaged in the optical fiber scanning module, which is not limited herein.

The waveguide module is arranged on the light outgoing path of the image generation unit and is provided with a plurality of layers of coupling-in units and a plurality of layers of coupling-out units, each layer of coupling-in unit is configured to couple in light with different wavelength ranges, and emergent images of mixed light beams of images to be displayed, which are generated by the image generation unit and are coupled out by the coupling-out units of the waveguide module, are spliced into the images to be displayed. When the optical fiber scanner comprises more than two optical fibers, the wavelength configuration of the input light source corresponding to each scanning optical fiber is the same, so that a plurality of optical fibers can share the waveguide module.

The waveguide module may be designed in different forms in different embodiments, for example, the waveguide module may include waveguides stacked in multiple layers, or may include multiple layers of coupling-in and coupling-out units disposed in one or more waveguides. The waveguide module is used for separating each subimage in the mixed light beam generated by the image generating unit and splicing the subimages into the image to be displayed.

In the embodiment of fig. 5, the optical fiber scanning module modulates and emits the M sub-images through one scanning optical fiber, where M is equal to N, that is, in fig. 5, the image splitting unit splits the image to be displayed into N sub-images, and one sub-image is a view angle sub-image; one path of input light source corresponding to one scanning optical fiber comprises N groups of laser light sources, each group of laser light sources comprises R, G, B monochromatic lasers, each group of laser light sources respectively and correspondingly modulates one of the N different angle-of-view sub-images, namely, the first laser light source correspondingly modulates the first angle-of-view sub-image, and the second laser light source correspondingly modulates the second angle-of-view sub-image … … and the Nth laser light source correspondingly modulates the Nth angle-of-view sub-image, so that each pixel point output by the single scanning optical fiber in the graph 5 carries pixel information of the N different angle-of-view sub-images, and a mixed image light beam emitted by the scanning optical fiber is collimated and then coupled into the waveguide module. In fig. 5, the waveguide module is exemplified by 3 × N stacked waveguides, each of which is configured to couple in only one output beam of a single color laser, for example, a first layer of waveguides is coupled in only a beam generated by a red laser R1 in a first group of laser sources, a second layer of waveguides is coupled in only a beam generated by a green laser G1 in the first group of laser sources, a third layer of waveguides is coupled in only a beam … … generated by a green laser B1 in the first group of laser sources, and so on, and each of the single color lasers corresponds to one of the waveguides. Of course, the foregoing corresponding manner is only an example, each monochromatic laser corresponds to one layer of waveguide, and the positioning sequence of the waveguides is not limited as long as each layer of waveguide can be designed to couple in only one output beam of the monochromatic laser. The waveguide coupling-in unit and the waveguide coupling-out unit are described in the following embodiments of this embodiment group with reference to fig. 6A, 6C, 6D, and 7A, and the N viewing angle sub-image light beams are coupled out and spliced into the image to be displayed after being transmitted by the respective waveguide substrates. Thus, the N viewing angle images can be seen, and the viewing angle of the display module is widened.

In addition, it is assumed that an image to be displayed has 1000 pixel points, and scanning is performed by one scanning optical fiber according to the prior art (i.e. when partial multiplexing is not adopted), so that the scanning optical fiber needs to scan 1000 pixel points; after the image to be displayed is divided into N viewing angle sub-images according to the idea of the invention, if the N viewing angle sub-images have the same number of pixel points and N viewing angle sub-image light beams are mixed and input into the same scanning optical fiber in a wavelength division multiplexing mode, the optical fiber only needs to scan 1000/N pixel points, so that the image refresh rate is improved.

In the embodiment of fig. 6A, taking N-2 in fig. 5 as an example, the waveguide-based display module shown in fig. 6A is shown in the lower right corner of the figure, which illustrates an image S to be displayed, and the image splitting unit 410 splits the image S to be displayed into the first and second viewing angle sub-images S1 and S2.

The first group 421 of laser sources in fig. 6A includes three monochromatic lasers of red, green and blue, wherein the red laser generates red light with R1 wavelength, the green laser generates green light with G1 wavelength, and the blue laser generates blue light with B1 wavelength; the second group of laser sources 422 includes three monochromatic lasers, red, green and blue, where the red laser produces red light at the R2 wavelength, the green laser produces green light at the G2 wavelength, and the blue laser produces blue light at the B2 wavelength. The first group of laser light sources 421 is used to modulate the pixel information of the first field-of-view sub-image S1, and the second group of laser light sources 422 is used to modulate the pixel information of the second field-of-view sub-image S2. The light beams generated by the first group of laser light sources 421 and the second group of laser light sources 422 are mixed and input into the same scanning fiber in the light scanner 430.

It can be understood that if the image S to be displayed has 120 pixel points, scanning is performed by one scanning optical fiber, and the scanning optical fiber needs to scan 120 pixel points; after the image S to be displayed is divided into the first view field subimage S1 and the second view field subimage S2, if the first view field subimage S1 and the second view field subimage S2 both have 60 pixel points, the first view field subimage S1 and the second view field subimage S2 are modulated by the first laser light source 421 and the second laser light source 422 respectively and are mixed and input into the same scanning optical fiber, and the optical fiber only needs to scan 60 pixel points. This increases the refresh rate of the image.

The light scanner 430 emits the mixed light beam of the first view field sub-image S1 and the second view field sub-image S2, and after being collimated by a collimating device such as an eyepiece optical system 440, the light beam is emitted to 6 layers of stacked waveguide substrates, and each layer of waveguide substrate is coupled with a light beam generated by a monochromatic laser.

Referring to fig. 6A, 6B, 6C, 6D and 7A, a waveguide module structure and a structure of an incoupling unit and an outcoupling unit in a waveguide module are described, where fig. 6A, 6B, 6C and 6D are described by taking a 6-layer incoupling unit as an example, and fig. 7A is described by taking a two-layer incoupling unit as an example.

As an alternative embodiment, in fig. 6A, assuming that each group of light sources includes R, G, B three light-emitting units, each layer of coupling-in units is configured to couple in only the light beam generated by one monochromatic laser in the light source. The incoupling unit is a reflective grating (such as the incoupling structure of fig. 6C) or a filter (such as the incoupling structure of fig. 6D); the outcoupling unit is an outcoupling grating (the outcoupling structure of fig. 6C) or an outcoupling mirror array (the outcoupling structure of fig. 6D).

In more detail, as shown in fig. 6A, the coupling-in units are sequentially disposed in the 6-layer waveguide substrate: an R1 incoupling unit, a G1 incoupling unit, a B1 incoupling unit, an R2 incoupling unit, a G2 incoupling unit and a B2 incoupling unit, wherein the R1 incoupling unit is used for incoupling red light with the wavelength of R1 in the mixed light beam into the first layer of waveguide substrate 451, and other light beams are transmitted through the R1 incoupling unit; the G1 coupling-in unit is used for coupling green light with the wavelength of G1 in the mixed light beam into the second layer of waveguide substrate 452, and other light beams are transmitted through the G1 coupling-in unit; the B1 incoupling unit is used to incouple blue light of B1 wavelength in the mixed beam into the third layer waveguide substrate 453 and the other beams are transmitted through the B1 incoupling unit. Three layers of incoupling units are also provided in the second set of waveguide substrates 460: an R2 incoupling unit, a G2 incoupling unit and a B2 incoupling unit, wherein the R2 incoupling unit is used for incoupling red light with the wavelength of R2 in the mixed light beam into the fourth layer waveguide substrate 454, and other light beams are transmitted by the R2 incoupling unit; a G2 incoupling unit for incoupling green light of G2 wavelength in the mixed beam into the fifth layer waveguide substrate 455, and the other beams are transmitted through the G2 incoupling unit; the B2 incoupling unit is used to incouple blue light of B2 wavelength in the mixed beam into the sixth layer of waveguide substrate 456. The stacking order of all the incoupling units here may not be limited to that shown in the figure. In addition, the last-layer incoupling unit of the last-layer waveguide substrate may be set as a normal incoupling unit, and the remaining light beam may be incoupled into the waveguide without wavelength selection, that is, in fig. 6A, the B2 incoupling unit may be set as a normal incoupling unit without wavelength selection.

6 layers of coupling-out units are arranged in the 6 layers of waveguide substrates: the 6 coupling-out units, namely the R1 coupling-out unit, the G1 coupling-out unit, the B1 coupling-out unit, the R2 coupling-out unit, the G2 coupling-out unit and the B2 coupling-out unit, are all configured to couple out the light beams coupled in by the corresponding coupling-in unit, and are coupling-out gratings (such as the coupling-out structure of fig. 6C) or coupling-out mirror arrays (such as the coupling-out structure of fig. 6D). A certain distance is arranged between the coupling-out units of the waveguides for transmitting different sub-image light beams, so that the coupled-out light beams can be spliced into the original image S to be displayed.

When all the coupling-in units adopt the reflective grating, as shown in fig. 6C, the reflective grating has a certain bandwidth, only the light beam with the wavelength within the bandwidth is reflected into the waveguide, and the light beams with other bands are transmitted through the reflective grating. Taking the R1 incoupling unit as an example, as shown in fig. 6B, which is a reflection efficiency graph of the R1 incoupling unit, the abscissa in the graph is the wavelength of the light beam incident on the R1 incoupling unit, and the ordinate is the reflection efficiency of the R1 incoupling unit, it can be seen from the graph that the R1 incoupling unit only performs reflective incoupling on red light with a wavelength of 650nm, and almost does not reflect light beams of other bands, and transmits the light beams directly.

When all the coupling-in units use optical filters, as shown in fig. 6D, the optical filter has a certain bandwidth, only the light beams with wavelengths within the bandwidth are reflected into the waveguide, the light beams with other bands are transmitted through the optical filter, and the optical filter can be a band-pass filter or other filters with similar functions.

As a preferred embodiment, all the coupling-in units described above can also use long-wavelength pass filters or short-wavelength pass filters. Fig. 6E shows that the coupling-in units all adopt long-wave pass filters as columns, and the cut-off wavelength gradually increases from the first layer of coupling-in units to the last layer of coupling-in units, so that each layer of coupling-in units only couples in one of R, G, B three-color lights of the corresponding sub-image light beam. When the fiber scanning module of fig. 4B is used as the image generating unit, it is assumed that the wavelengths of the lasers in fig. 4B are configured as follows: the emergent wavelength of the red laser R1 is 650nm, the emergent wavelength of the green laser G1 is 530nm, and the emergent wavelength of the blue laser B1 is 460 nm; the emission wavelength of the red laser R2 is 635nm, the emission wavelength of the green laser G2 is 520nm, and the emission wavelength of the blue laser B2 is 450 nm. Then the 6 layers of waveguide substrates in fig. 6E are sequentially provided with incoupling units according to the wavelength of the incoupling beam from small to large: a B2 incoupling unit, a B1 incoupling unit, a G2 incoupling unit, a G1 incoupling unit, a R2 incoupling unit and a R1 incoupling unit, wherein, as shown in fig. 6F, the B2 incoupling unit has a cutoff wavelength of 455nm, which is just capable of reflecting a light beam of the blue laser B2 having an exit wavelength of 450nm, and the wavelengths of light beams generated by the other lasers (the red laser R1 having an exit wavelength of 650nm, the green laser G1 having an exit wavelength of 530nm, the blue laser B1 having an exit wavelength of 460nm, the red laser R2 having an exit wavelength of 635nm, and the green laser G2 having an exit wavelength of 520nm) are all longer than the cutoff wavelength of the B2 incoupling unit, and therefore all project through the B2 incoupling unit, the cutoff wavelengths of the other incoupling units being gradually increased, so that by the special stacking and the gradually increasing cutoff wavelengths of each incoupling unit only one incoupling wavelength, each sub-image is separated from the mixed beam.

All the coupling-in units can also use short-wave pass filters, at this time, the cut-off wavelength of the short-wave pass filters from the first layer of coupling-in unit to the last layer of coupling-in unit is set according to gradual reduction, the wavelength selection principle is similar to that of the long-wave pass filters, and the description is omitted here. Similarly, the last layer of coupling-in units can be set as common coupling-in units, and the rest light beams can be coupled into the waveguide without wavelength selection.

As another alternative, the waveguide module may include N layers of waveguide substrates stacked together, the coupling-in unit of each group of waveguide substrates is a filter, and if each group of light sources includes R, G, B light-emitting units, each filter is designed to reflect RGB three-band light of a corresponding sub-image light beam and transmit other bands of light. The waveguide-based display module shown in fig. 7A, in which each layer of waveguide substrate includes a waveguide, is different from the aforementioned display module shown in fig. 6A in that after the light beam is emitted by the light scanner 530 and collimated by the collimating device such as the eyepiece optical system 540, the light beams with the wavelengths of R1, G1, and B1 in the mixed light beam are coupled into the first waveguide 550 by the filter 551 arranged in the first waveguide 550 for total reflection and propagation, and the other light beams are transmitted through the filter 551 and enter the second waveguide 560; the optical filter 561 disposed in the second waveguide 560 couples all the beams with the wavelengths of R2, G2, and B2 in the mixed beam into the second waveguide 560 for total reflection propagation. The filters 551 provided in the first waveguide 550 and the filters 561 provided in the second waveguide 560 described above are each filters having three operating wavelength bands. Here, taking the filter 551 as an example, as shown in fig. 7B, a schematic diagram of the reflection efficiency of the filter 551 is shown, in which the abscissa represents the wavelength of incident light and the ordinate represents the reflection efficiency. It can be seen from the figure that the filter 551 can reflect red light of 650nm, green light of 530nm, and blue light of 460nm, and hardly reflect light beams of other wavelength bands (here, mainly light beams of wavelengths propagating in the second waveguide) and directly transmit the light beams.

As an alternative embodiment, in fig. 7A, in the case of the optical filter 551 disposed in the first waveguide 550, a common coupling unit may be disposed in the second waveguide 560 to couple the remaining light beam into the second waveguide, and the wavelength does not need to be selected.

Also, the coupling-out unit in the first waveguide 550 and the coupling-out unit in the second waveguide 560 may be coupling-out gratings or coupling-out mirror arrays. The coupling-out unit 552 in the first waveguide 550 couples the light beam transmitted in the first waveguide out of the first waveguide, and the coupling-out unit 562 in the second waveguide 560 couples the light beam transmitted in the second waveguide out of the second waveguide. A certain distance is provided between the coupling-out units of the first waveguide 550 and the second waveguide 560 so that the coupled-out light beams can be spliced into the original image S to be displayed.

In the above embodiments, each light source group of the waveguide module includes only R, G, B light-emitting units, and it should be understood by those skilled in the art that when each light source group includes not only R, G, B light-emitting units, the coupling-in units and the coupling-out units of the waveguide module can be adjusted in number or parameters according to the same principle of the present invention.

Next, an embodiment of the fiber scanning module modulating M sub-images simultaneously through a plurality of scanning fibers is described with reference to fig. 8, where M > N. As shown in fig. 8, the image dividing unit divides the image to be displayed into 6 sub-images S11, S12, S13, S21, S22, and S23, where M is 6 and N is 2. The sub-images S11 and S21 are modulated by

laser light sources

6211 and 6212, respectively, and the image beams modulated by the

laser light sources

6211 and 6212 are input to the scanning fiber 6210; the sub-images S12 and S22 are modulated by

laser light sources

6221 and 6222, respectively, and the image beams modulated by the

laser light sources

6221 and 6222 are input to the scanning fiber 6220; the sub-image S13 and the sub-image S23 are modulated by the

laser light sources

6231 and 6232, respectively, and the image beams modulated by the

laser light sources

6231 and 6232 are input to the scanning fiber 6230. Thus, each pixel point scanned by each optical fiber contains the pixel information of two sub-images.

In fig. 8, the

laser light sources

6211, 6221, 6231 have the same configuration and include three monochromatic lasers R1, G1, B1; the

laser light sources

6212, 6222, 6232 have the same arrangement and include three monochromatic lasers of R2, G2, and B2. The wavelength of each laser can be configured as follows: the emergent wavelength of the red laser R1 is 650nm, the emergent wavelength of the green laser G1 is 530nm, and the emergent wavelength of the blue laser B1 is 460 nm; the emission wavelength of the red laser R2 is 635nm, the emission wavelength of the green laser G2 is 520nm, and the emission wavelength of the blue laser B2 is 450 nm.

The beams modulated by the

scanning fibers

6210, 6220, 6230 are spliced to each other prior to incidence on the waveguide substrate, which is content splicing, rather than physical splicing of the scanning beams. The light beams modulated by the scanning

optical fibers

6210, 6220, 6230 are transmitted into the waveguide module 650 after passing through the collimating system 640, and the waveguide module 650 couples out the sub-images S11, S12, S13, S21, S22, S23 according to the waveguide module schemes in the above embodiments, thereby completing the field-of-view splicing at the human eye.

Flat panel display screen embodiment:

based on the same idea as that of the optical fiber scanning module, an embodiment of the present invention further discloses a flat panel display, as shown in fig. 9A, each pixel of the flat panel display includes at least two groups of sub-pixels, each group of sub-pixels includes R, G, B three color units, and the same color unit in each group of sub-pixels adopts different wavelengths.

In the figure, it can be seen that a pixel point X in the flat panel display 710 includes m groups of sub-pixel information, and each group of sub-pixel information is modulated by R, G, B color elements with different wavelengths. For example, the first group of sub-pixel information is modulated by a red color cell of R1 wavelength, a green color cell of G1 wavelength, a blue color cell of B1 wavelength; the second group of sub-pixel information is modulated by a red color cell of R2 wavelength, a green color cell of G2 wavelength, a blue color cell of B2 wavelength; by analogy, the m-th group of sub-pixel information is modulated by a red color cell with an Rm wavelength, a green color cell with a Gm wavelength and a blue color cell with a Bm wavelength.

In a preferred embodiment, as shown in FIG. 9B, a pixel X of the flat panel display 700 includes two sets of sub-pixel information. Wherein the first group of sub-pixel information is modulated by a red color cell of R1 wavelength, a green color cell of G1 wavelength, a blue color cell of B1 wavelength; the second group of sub-pixel information is modulated by a red color cell at the R2 wavelength, a green color cell at the G2 wavelength, and a blue color cell at the B2 wavelength. It is understood that each pixel of the flat panel display 700 thus carries information of two groups of pixels, and one flat panel display 700 can display two images with different contents at the same time by means of wavelength division multiplexing.

The flat panel display screen can be a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED) display screen, a liquid crystal silicon Liquid Crystal On Silicon (LCOS) display screen, a Digital Light Processing (DLP) display screen and other flat panel display screens.

A second set of embodiments of the waveguide-based display module (the image generating subunit being a flat panel display screen):

in the waveguide-based display module shown in fig. 10, the image generating unit includes a flat panel display screen according to the above embodiment, wherein:

each pixel of the flat panel display 700 comprises M groups of sub-pixels, and the flat panel display modulates a mixed beam containing the M sub-images in a wavelength division multiplexing manner, wherein the same color beam in each sub-image beam has a different wavelength. The mixed image light displayed by the flat panel display 700 at each time is collimated by the eyepiece optical system and then coupled into the waveguide module.

The waveguide module is arranged on an emergent light path of the flat panel display screen and is provided with a plurality of layers of coupling-in units and a plurality of layers of coupling-out units, each layer of coupling-in unit is configured to couple in light with different wavelength ranges, and emergent images of mixed light beams of images to be displayed, which are generated by the flat panel display screen, are spliced into the images to be displayed after being coupled out by the waveguide module coupling-out units.

In the present application, the flat panel display screen 700 can display at least two different viewing angle sub-images each time, and each pixel point of the flat panel display screen 700 carries at least two sets of different viewing angle sub-pixel information. Wherein the first viewing angle sub-pixel is modulated by a red color cell of R1 wavelength, a green color cell of G1 wavelength, a blue color cell of B1 wavelength; second angular field of view sub-pixel is modulated … … by red color cell of R2 wavelength, green color cell of G2 wavelength, blue color cell of B2 wavelength the nth angular field of view sub-pixel is modulated by red color cell of Rm wavelength, green color cell of Gm wavelength, blue color cell of Bm wavelength.

In this embodiment, how the waveguide module selects the wavelength of the input light beam and couples the input light beam into the waveguide module for transmission, and the coupling process is the same as that of the first group of embodiments of the waveguide-based display module, which is not described herein again.

MEMS scanning module embodiment:

based on the same idea as that of the optical fiber scanning module, an embodiment of the present invention further discloses an MEMS scanning module 850, as shown in fig. 11A, including an MEMS scanner and light sources, where the light sources include N groups of light sources, each group of light sources includes R, G, B three light emitting units, N light emitting units of the same color channel in the N groups of light sources are configured to emit light with different wavelengths, and N is an integer greater than or equal to 2. N groups of light sources in the light-emitting light sources are N groups of laser tube light sources or N groups of LED light sources.

In the figure, it can be seen that there are N groups of RGB light sources, where the red light generator of the first light source produces red light at the R1 wavelength, the green light generator produces green light at the G1 wavelength, and the blue light generator produces blue light at the B1 wavelength; the red light generator of the second light source generates red light of R2 wavelength, the green light generator generates green light of G2 wavelength, the blue light generator generates blue light of B2 wavelength … … the red light generator of the nth light source generates red light of Rn wavelength, the green light generator generates green light of Gn wavelength, and the blue light generator generates blue light of Bn wavelength. The beams of light generated by each group of light sources are combined and then are reflected and scanned out by a scanning mirror of the MEMS scanning module.

Alternatively, as shown in fig. 11B, each pixel scanned by the scanning mirror 810 of the MEMS scanning module 800 is reflected by the combined light beams modulated by the first light source 821 and the second light source 822. Wherein the red light generator of the first light source 821 generates red light of R1 wavelength, the green light generator generates green light of G1 wavelength, and the blue light generator generates blue light of B1 wavelength; the red light generator of the second light source 822 generates red light of a wavelength of R2, the green light generator generates green light of a wavelength of G2, and the blue light generator generates blue light of a wavelength of B2. The light source here may be a light emitting diode LED or a laser.

A third set of embodiments of the waveguide-based display module (the image generation subunit being a MEMS scanning module):

in the waveguide-based display module of the embodiment shown in fig. 12, the image generating unit is a set of MEMS scanning modules described in the above embodiments, wherein:

the image segmentation unit is used for segmenting an image to be displayed into N sub-images, wherein N is an integer greater than or equal to 2; the N sub-images may be understood as N different field angle sub-images;

each pixel of the MEMS scanning module comprises N groups of sub-pixels, the MEMS scanning module modulates mixed light beams containing the N sub-images in a wavelength division multiplexing mode, and the same color light beams in the sub-image light beams have different wavelengths;

the waveguide module is arranged on an emergent light path of the MEMS scanning module and is provided with a plurality of layers of coupling-in units and a plurality of layers of coupling-out units, each layer of coupling-in unit is configured to couple in light with different wavelength ranges, and emergent images of mixed light beams of images to be displayed, which are generated by the MEMS scanning module, are spliced into the images to be displayed after being coupled out by the waveguide module coupling-out units.

In this embodiment, N groups of light sources respectively modulate N sub-images with different field angles to form image beams, and after the image beams are combined, the scanning mirror scans out pixel by pixel in a reflection manner. The red light generator of the first light source generates red light with a wavelength of R1, the green light generator generates green light with a wavelength of G1, and the blue light generator generates blue light with a wavelength of B1; the red light generator of the second light source generates red light of R2 wavelength, the green light generator generates green light of G2 wavelength, the blue light generator generates blue light of B2 wavelength … … the red light generator of the nth light source generates red light of Rn wavelength, the green light generator generates green light of Gn wavelength, and the blue light generator generates blue light of Bn wavelength.

In this embodiment, the mixed image light reflected by the scanning mirror of the MEMS scanner is collimated by the eyepiece optical system and then coupled into N sets of stacked waveguide substrates, each set of waveguide substrates is coupled into only the corresponding view angle sub-image light beam, that is, the first view angle sub-image light beam is coupled into the first set of waveguide substrates, and the second view angle sub-image light beam is coupled into the second set of waveguide substrates … … and the nth view angle sub-image light beam is coupled into the nth set of waveguide substrates. And the N viewing angle sub-image light beams are coupled out after being transmitted by the respective waveguide substrates to be spliced into the image to be displayed. Therefore, the field angle of the display module is widened.

Similarly, in this embodiment, how each layer of waveguides performs wavelength selection and incoupling transmission on the input light beam, and the outcoupling and splicing process is the same as that of the first group of embodiments of the waveguide-based display module, and is not described herein again.

In all embodiments of the present invention, an "image to be displayed" may be a complete image or a partial image in a complete image, that is, a waveguide-based display module in the embodiments of the present invention may be used as an independent module to process a complete view field picture alone, or may be used as a part of a mosaic module to process only a partial view field picture, and the complete view field picture is realized after being mosaic with a plurality of similar modules.

In all embodiments of the waveguide-based display module, as a preferred implementation, each group of waveguide substrates is provided with a relay unit for expanding a pupil along a direction perpendicular to an expanding pupil direction of the coupling-out unit, and the relay unit may be a relay grating or a mirror array. Taking the relay grating as an example in fig. 6A, the coupling-out unit in the figure expands pupil in the Y direction, and the relay grating expands pupil in the X direction.

In all embodiments of the waveguide-based display module, when the image splitting unit splits the image to be displayed into a plurality of sub-images, the adjacent sub-images may or may not have the same image area, and when the adjacent sub-images have the same image area, there may be some overlapped portions of the adjacent sub-images in the stitching, but the image to be displayed is still presented to the human eye.

In addition, the embodiment of the invention also provides near-to-eye display equipment using the waveguide-based display module.

Because the display module based on the waveguide adopts the wavelength division multiplexing mode, the number of scanning optical fibers can be reduced under the condition of realizing the same resolution and the same field angle, and the miniaturization production of the near-eye display equipment is facilitated.

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Claims

1. A waveguide-based display module, comprising:

when the image generation unit modulates and emits the M sub-images through the image generation subunits simultaneously, light beams of the image generation subunits are spliced with each other before being incident on the waveguide module, wherein the splicing refers to content splicing;

the waveguide module is arranged on the light outgoing path of the image generation unit and is provided with a plurality of layers of coupling-in units and a plurality of layers of coupling-out units, each layer of coupling-in unit is configured to couple in light with different wavelength ranges, and a certain distance is arranged between the coupling-out units for transmitting different sub-image light beams, so that the emergent images of the mixed light beams of the image to be displayed, which are generated by the image generation unit and are coupled out by the coupling-out units of the waveguide module, are spliced into the image to be displayed at human eyes.

2. The display module of claim 1, wherein the waveguide module comprises 3 × N incoupling units and 3 × N outcoupling units when each sub-image is modulated by R, G, B three light-emitting units, each incoupling unit except for the last incoupling unit being configured to incouple only one wavelength of the mixed light beam of the image to be displayed, the incoupling unit being a reflective grating or a filter.

3. The display module according to claim 1, wherein the waveguide module comprises N layers of stacked waveguide substrates, and when each sub-image is modulated by R, G, B light-emitting units, the coupling-in units of each layer of waveguide substrate except the last coupling-in unit of the N layers of stacked waveguide substrates are optical filters, each optical filter being designed to reflect RGB three-band light of the corresponding sub-image beam and transmit other bands of light.

4. The display module of claim 1, wherein when each sub-image is modulated by R, G, B light-emitting cells, the waveguide module comprises 3 × N coupling-in cells and 3 × N coupling-out cells, and the coupling-in cells except the last coupling-in cell adopt long-wavelength pass filters or short-wavelength pass filters; when the coupling-in units all adopt long-wave pass filters, the cut-off wavelengths of the long-wave pass filters from the first layer of coupling-in units to the penultimate coupling-in units are gradually increased, and when the coupling-in units all adopt short-wave pass filters, the cut-off wavelengths of the short-wave pass filters from the first layer of coupling-in units to the penultimate coupling-in units are gradually decreased; each layer of coupling-in units couples in only one wavelength of the mixed light beam of the image to be displayed.

5. A display module according to any one of claims 2 to 4, wherein the outcoupling unit is an outcoupling grating or an outcoupling mirror array.

6. A display module according to claim 3, wherein each group of waveguide substrates has a relay element disposed therein for expanding the pupil in a direction perpendicular to the direction of the expanding pupil of the outcoupling element.

7. The display module according to claim 5, wherein adjacent sub-images among the plurality of sub-images divided by the image dividing unit have the same image area.

8. The display module according to any one of claims 1 to 4, wherein the image generating unit is a fiber scanning module;

the optical fiber scanning module comprises an optical fiber scanner and an input light source, wherein the optical fiber scanner comprises at least one scanning optical fiber, one scanning optical fiber corresponds to one path of input light source, the one path of input light source comprises N groups of light sources, each group of light source at least comprises R, G, B light-emitting units, the light-emitting units with the same color channel in the N groups of light sources are configured to emit light with different wavelengths, and N is an integer greater than or equal to 2; and the light rays generated by N groups of light sources in the input light source are input into one scanning optical fiber in the optical fiber scanner after being combined.

9. The display module according to any one of claims 1 to 4, wherein the image generation subunit is a flat panel display or a MEMS scanning module; each pixel of the flat panel display screen comprises at least two groups of sub-pixels, each group of sub-pixels comprises R, G, B three color units, and the same color units in each group of sub-pixels adopt different wavelengths; the MEMS scanning module comprises an MEMS scanner and light-emitting sources, wherein the light-emitting sources comprise N groups of light sources, each group of light sources at least comprises R, G, B light-emitting units, the light-emitting units with the same color channel in the N groups of light sources are configured to emit light with different wavelengths, and N is an integer greater than or equal to 2.

10. A display device comprising at least one set of waveguide-based display modules according to any one of claims 1 to 8.