Glasses

Abstract

The utility model relates to the technical field of image display, and provides a pair of glasses, which comprises a lens module, the lens module comprises an optical waveguide and a polarization mechanism, and the polarization mechanism is arranged on one side far away from an out-coupling grating of the optical waveguide; the polarization mechanism is used for splitting incident natural light into a first light beam and a second light beam and enabling the emitted first light beam and the second light beam to have the same polarization state; the first light beam and the second light beam are emitted out through the coupling-out grating after entering the optical waveguide, and the coupling-out grating is a grating for inhibiting polarization states of the first light beam and the second light beam. According to the glasses, the polarization mechanism is arranged on the side, away from the coupling-out grating, of the optical waveguide, incident natural light can be split, and the polarization state of the first light beam and the polarization state of the second light beam after light splitting are the same; the coupling-out grating is set to be the grating for inhibiting the polarization states of the first light beam and the second light beam, so that rainbow-shaped stray light entering human eyes can be weakened, and the impression of a glasses wearer is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to image display technical field especially relates to a pair of glasses. BACKGROUND

[0002] Augmented Reality (AR) glasses, mixed reality glasses and other smart wearable devices can integrate virtual content with the real world, and can be applied to industrial manufacturing, medical treatment, entertainment, design, life and other scenes. In recent years, its application in industrial applications and consumer electronics industry has attracted widespread attention.

[0003] Augmented reality glasses or mixed reality glasses both contain a lens module, which can display virtual images in front of the user's eyes, and the user can also watch the outside scene through the lens. According to different display schemes, the lens module can be a diffractive optical waveguide lens, an array optical waveguide lens, a free-form surface, a Birdbath and the like.

[0004] The diffractive optical waveguide lens distributes the direction and energy of light by diffractive grating. In addition to diffracting the light transmitted in the optical waveguide, the diffractive grating also diffracts the ambient light incident to the optical waveguide, producing stray light similar to rainbow stripes, which affects the experience of the wearer. SUMMARY

[0005] The utility model provides a pair of glasses to solve the defect that the lens module produces rainbow stripe stray light in prior art, which affects the perception of the wearer.

[0006] The utility model provides a pair of glasses, including lens module, the lens module includes: optical waveguide and polarization mechanism, the polarization mechanism sets up in the side away from the out-coupling grating of optical waveguide, the polarization mechanism is used for splitting the natural light of incidence into first light beam and second light beam, and makes the polarization state of the first light beam and the second light beam that emit same, the first light beam and the second light beam are incident after the optical waveguide and are shot out through the out-coupling grating, wherein, the out-coupling grating is the grating of inhibiting the polarization state of the first light beam and the second light beam.

[0007] According to the pair of glasses provided by the utility model, the polarization mechanism includes polarization beam splitting assembly and polarization conversion device, the polarization conversion device is arranged between the polarization beam splitting assembly and the optical waveguide, the polarization beam splitting assembly is used for splitting the natural light of incidence into the first light beam and the second light beam, wherein, the first light beam emitted from the polarization beam splitting assembly has a first polarization state, and the second light beam emitted from the polarization beam splitting assembly has a second polarization state, the polarization conversion device is used for converting the polarization state of the first light beam or the second light beam passing through it, so that the polarization state of the first light beam and the second light beam is same.

[0008] According to the glasses provided by the utility model, the polarization splitting assembly comprises a light splitting sheet and a reflector, the light splitting sheet is used for splitting the incident natural light into the first light beam and the second light beam, the first light beam propagates along a first direction, the second light beam propagates along a second direction, the first direction is the transmission direction of the light splitting sheet, and the second direction is the reflection direction of the light splitting sheet, and the reflector is used for reflecting the second light beam and making the second light beam propagate along the first direction.

[0009] According to the glasses provided by the utility model, the polarization conversion device is arranged between the reflector and the optical waveguide, and the second light beam is perpendicular to the polarization conversion device, the polarization conversion device is used for converting the polarization state of the second light beam into the first polarization state.

[0010] According to the glasses provided by the utility model, the first polarization state is a P polarization state, the second polarization state is an S polarization state, and the coupling-out grating is a grating for inhibiting the P polarization state.

[0011] According to the glasses provided by the utility model, the polarization conversion device is arranged between the light splitting sheet and the optical waveguide, and the first light beam is perpendicular to the polarization conversion device, the polarization conversion device is used for converting the polarization state of the first light beam passing through the polarization conversion device into the second polarization state.

[0012] According to the glasses provided by the utility model, the first polarization state is a P polarization state, the second polarization state is an S polarization state, and the coupling-out grating is a grating for inhibiting the P polarization state.

[0013] According to the glasses provided by the utility model, the polarization mechanism comprises a polarization splitting assembly, the polarization splitting assembly is arranged on the side away from the coupling-out grating of the optical waveguide, the polarization splitting assembly is used for splitting the incident natural light into the first light beam and the second light beam, the first light beam and the second light beam are both linear polarization states, and the coupling-out grating is a grating for inhibiting linear polarization state light beams and allowing circular polarization state light beams to pass through.

[0014] According to the glasses provided by the utility model, the first light beam is P polarization state linearly polarized light, and the second light beam is S polarization state linearly polarized light.

[0015] According to the glasses provided by the utility model, the coupling-in grating and the coupling-out grating of the optical waveguide are arranged on the same side of the optical waveguide, the light emitted by the light source is incident into the optical waveguide after passing through the coupling-in grating, and is emitted by the coupling-out grating after propagating in the optical waveguide.

[0016] The glasses provided by the utility model, by setting the polarization mechanism on the side of the optical waveguide far from the coupling-out grating, the incident natural light can be split, and the polarization states of the first light beam and the second light beam after splitting are same; by setting the coupling-out grating as the grating for inhibiting the polarization states of the first light beam and the second light beam, the rainbow stripe stray light entering the human eye can be weakened, and the visual experience of the glasses wearer is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description, obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 It is the optical path diagram of the glasses in the prior art.

[0019] Figure 2 It is one of the optical path diagrams of the glasses provided by the utility model.

[0020] Figure 3 It is the second of the optical path diagrams of the glasses provided by the utility model.

[0021] Figure 4 It is the third of the optical path diagrams of the glasses provided by the utility model.

[0022] Reference signs:

[0023] 10, optical waveguide; 11, coupling-in grating; 12, coupling-out grating; 20, light source; 30, polarization mechanism; 31, polarization splitting component; 32, polarization conversion device;

[0024] 100, natural light; 110, first light beam; 120, second light beam; 200, human eye; 311, light splitting sheet; 312, reflecting mirror. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings in the utility model, and the technical scheme in the utility model will be clearly and completely described, obviously, the described embodiments are some embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] The following will combine Figures 1-4 to describe the glasses of the utility model.

[0027] As Figure 1As shown, the same side surface of the optical waveguide 10 is provided with the in-coupling grating 11 and the out-coupling grating 12, the light emitted by the light source 20 is incident into the optical waveguide 10 through the in-coupling grating 11, and is emitted by the out-coupling grating 12 after several times of total reflection in the optical waveguide 10, and is incident into the human eye 200. The natural light 100 is incident into the optical waveguide 10, is emitted by the out-coupling grating 12, and forms the rainbow stripe stray light which enters the human eye 200, the rainbow stripe stray light interferes with vision, and affects the visual experience of the wearer of the glasses. Based on this, the embodiment of the utility model provides a new kind of glasses.

[0028] As Figure 2 、 Figure 3 and Figure 4 shown, in the embodiment of the utility model, glasses include lens module, and lens module includes: optical waveguide 10 and polarization mechanism 30, polarization mechanism 30 is arranged in the side away from the out-coupling grating 12 of optical waveguide 10. Natural light 100 is incident into polarization mechanism 30 and is split into first light beam 110 and second light beam 120, and the polarization state of first light beam 110 and second light beam 120 is different after splitting. Specifically, assuming that first light beam 110 is S polarization state light beam after splitting, then second light beam 120 is P polarization state light beam after splitting, and polarization mechanism 30 is further used to convert second light beam 120 into S polarization state light beam, or convert first light beam 110 into P polarization state light beam, so that the polarization state of first light beam 110 and second light beam 120 is same after emitting polarization mechanism 30.

[0029] Optionally, first light beam 110 after splitting can also be S polarization state linearly polarized light, and second light beam 120 after splitting is P polarization state linearly polarized light. In the embodiment, compared with circular polarization state, the polarization state of first light beam 110 and second light beam 120 is linearly polarized state.

[0030] First light beam 110 and second light beam 120 with same polarization state are incident into optical waveguide 10 and are emitted by out-coupling grating 12, wherein out-coupling grating 12 is the grating for inhibiting the polarization state of first light beam 110 and second light beam 120.

[0031] Specifically, when first light beam 110 and second light beam 120 are both S polarization state light beams, then out-coupling grating 12 is the grating for inhibiting S polarization state light beam;When first light beam 110 and second light beam 120 are both P polarization state light beams, then out-coupling grating 12 is the grating for inhibiting P polarization state light beam. That is to say, when first light beam 110 and second light beam 120 are both linearly polarized state light beams, then out-coupling grating 12 is the grating for inhibiting the linearly polarized state light beam. By setting the grating for inhibiting the polarization state of first light beam 110 and second light beam 120, the rainbow stripe stray light incident into human eye 200 can be weakened, so as to improve the visual experience of the wearer of the glasses.

[0032] The glasses provided in this embodiment of the invention can split incident natural light by setting a polarization mechanism on the side of the optical waveguide away from the coupling grating, and the polarization states of the first beam and the second beam after splitting are the same; by setting the coupling grating as a grating to suppress the polarization states of the first beam and the second beam, the rainbow-like stray light entering the human eye can be reduced, thus improving the visual experience of the glasses wearer.

[0033] like Figure 2 and Figure 3 As shown in the embodiment of this utility model, the polarization mechanism 30 includes a polarization beam splitter 31 and a polarization conversion device 32, with the polarization conversion device 32 disposed between the polarization beam splitter 31 and the optical waveguide 10. When natural light 100 is incident on the polarization beam splitter 31, the polarization beam splitter 31 splits the natural light 100 into a first beam 110 and a second beam 120, wherein the first beam 110 has a first polarization state and the second beam 120 has a second polarization state. After the first beam 110 or the second beam 120 enters the polarization conversion device 32, the polarization state of the first beam 110 or the second beam 120 can be converted so that the polarization states of the first beam 110 and the second beam 120 are the same.

[0034] Specifically, the polarization conversion device 32 can be disposed in the emission direction of the second beam 120. After the first beam 110 is emitted from the polarization beam splitter 31, it directly enters the optical waveguide 10. After the second beam 120 is emitted from the polarization beam splitter 31, it enters the polarization conversion device 32. The polarization conversion device 32 converts the polarization state of the second beam 120 into the first polarization state. Then, the second beam 120 enters the optical waveguide 10 again. At this time, the polarization states of the first beam 110 and the second beam 120 entering the optical waveguide 10 are both the first polarization state.

[0035] Optionally, the polarization conversion device 32 can also be disposed in the emission direction of the first beam 110. After the first beam 110 is emitted from the polarization beam splitter 31, it enters the polarization conversion device 32, which converts the polarization state of the first beam 110 into a second polarization state. Then, the first beam 110 enters the optical waveguide 10. After the second beam 120 is emitted from the polarization beam splitter 31, it directly enters the optical waveguide 10. At this time, the polarization states of both the first beam 110 and the second beam 120 entering the optical waveguide 10 are the second polarization state.

[0036] Optionally, in an embodiment of the present invention, the first polarization state can be a P polarization state, and the second polarization state can be an S polarization state; or the first polarization state can be an S polarization state, and the second polarization state can be a P polarization state.

[0037] Further, in an embodiment of this utility model, the polarization beam splitter 31 includes a beam splitter 311 and a reflector 312. When natural light 100 is incident on the beam splitter 311, the beam splitter 311 splits the natural light 100 into a first beam 110 and a second beam 120. The first beam 110 propagates through the beam splitter 311 along a first direction, that is, the first direction is the transmission direction of the beam splitter 311. The second beam 120 is reflected by the beam splitter 311 to the reflector 312, and then the second beam 120 propagates along the reflection direction of the beam splitter 311. After being reflected by the reflector 312, the propagation direction of the second beam 120 is the same as the propagation direction of the first beam 110.

[0038] like Figure 2 As shown, in one embodiment of this invention, a polarization conversion device 32 is disposed between a reflector 312 and an optical waveguide 10. The first beam 110, after passing through a beam splitter 311, directly enters the optical waveguide 10. The second beam 120, after being reflected by the reflector 312, enters the polarization conversion device 32, which converts the polarization state of the second beam 120 to a first polarization state. Afterward, the second beam 120 enters the optical waveguide 10.

[0039] In this embodiment, it is assumed that the first beam 110 is always a P-polarized beam, and the second beam 120 is initially an S-polarized beam. After passing through the polarization conversion device 32, the polarization state of the second beam 120 is converted to a P-polarized state. In this embodiment, the coupling grating 12 is a grating for suppressing the P-polarized state, so as to reduce the rainbow-like stray light entering the human eye 200.

[0040] like Figure 3 As shown, in another embodiment of this invention, the polarization conversion device 32 is disposed between the beam splitter 311 and the optical waveguide 10. After passing through the beam splitter 311, the first beam 110 enters the polarization conversion device 32, which converts the polarization state of the first beam 110 to a second polarization state. Then, the first beam 110 enters the optical waveguide 10. The second beam 120, after being reflected by the mirror 312, directly enters the optical waveguide 10, and the polarization state of the second beam 120 remains the second polarization state throughout.

[0041] In this embodiment, it is assumed that the first beam 110 is initially a P-polarized beam, and the second beam 120 is always an S-polarized beam. After passing through the polarization conversion device 32, the polarization state of the first beam 110 is converted to S-polarization. In this embodiment, the coupling grating 12 is a grating for suppressing S-polarization to reduce the rainbow-like stray light entering the human eye 200.

[0042] like Figure 4As shown, in still another embodiment of the present application, the polarization mechanism 30 comprises a polarization beam splitting component 31, which is arranged on the side away from the out-coupling grating 12 of the optical waveguide 10. The polarization beam splitting component 31 comprises a beam splitter 311 and a mirror 312. When the natural light 100 is incident on the beam splitter 311, the beam splitter 311 splits the natural light 100 into a first light beam 110 and a second light beam 120. The first light beam 110 transmits through the beam splitter 311 and propagates in a first direction, i.e., the first direction is the transmission direction of the beam splitter 311. The second light beam 120 is reflected by the beam splitter 311 to the mirror 312, and then propagates in the reflection direction of the beam splitter 311. After being reflected by the mirror 312, the second light beam 120 enters the optical waveguide 10 in the same direction as the first light beam 110. In this embodiment, the polarization states of the first light beam 110 and the second light beam 120 are both linear polarization states. The out-coupling grating 12 is a grating that suppresses linearly polarized light beams but allows circularly polarized light beams to pass through, so that when the first light beam 110 and the second light beam 120 are emitted by the out-coupling grating 12, the rainbow-like stray light entering the eye 200 can be weakened, thereby improving the visual experience after wearing glasses.

[0043] Optionally, in this embodiment, the first light beam 110 can be a linearly polarized light of P polarization state, and the second light beam 120 is a linearly polarized light of S polarization state; or the first light beam 110 can be a linearly polarized light of S polarization state, and the second light beam 120 is a linearly polarized light of P polarization state.

[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An eyeglass comprising a lens module, the lens module comprising: The optical waveguide and the polarization mechanism are arranged on one side away from the out-coupling grating of the optical waveguide; The polarization mechanism is used to split the incident natural light into a first light beam and a second light beam, and to make the polarization states of the emitted first light beam and second light beam the same; The first light beam and the second light beam are incident on the optical waveguide and are emitted through the out-coupling grating, wherein the out-coupling grating is a grating that suppresses the polarization states of the first light beam and the second light beam.

2. The eyeglasses of claim 1, wherein, The polarization mechanism comprises a polarization splitting component and a polarization conversion device, and the polarization conversion device is arranged between the polarization splitting component and the optical waveguide; The polarization splitting component is used to split the incident natural light into the first light beam and the second light beam, wherein the first light beam emitted from the polarization splitting component has a first polarization state, and the second light beam emitted from the polarization splitting component has a second polarization state; The polarization conversion device is used to convert the polarization state of the first light beam or the second light beam passing through it, so that the polarization states of the first light beam and the second light beam are the same.

3. The eyeglasses of claim 2, wherein, The polarization splitting component comprises a beam splitter and a mirror; The beam splitter is used to split the incident natural light into the first light beam and the second light beam, the first light beam propagates along a first direction, and the second light beam propagates along a second direction, the first direction is the transmission direction of the beam splitter, and the second direction is the reflection direction of the beam splitter; The mirror is used to reflect the second light beam and make the second light beam propagate along the first direction.

4. The eyeglasses of claim 3, wherein, The polarization conversion device is arranged between the mirror and the optical waveguide, and the second light beam is incident on the polarization conversion device perpendicularly; The polarization conversion device is used to convert the polarization state of the second light beam to the first polarization state.

5. The eyeglasses of claim 4, wherein, The first polarization state is a P-polarization state, the second polarization state is an S-polarization state, and the out-coupling grating is a grating that suppresses the P-polarization state.

6. The eyeglasses of claim 3, wherein, The polarization conversion device is arranged between the beam splitter and the optical waveguide, and the first light beam is incident on the polarization conversion device perpendicularly; The polarization conversion device is used to convert the polarization state of the first light beam passing through it to the second polarization state.

7. The eyeglasses of claim 6, wherein, The first polarization state is a P-polarization state, the second polarization state is an S-polarization state, and the out-coupling grating is a grating that suppresses the S-polarization state.

8. The eyeglasses of claim 1, wherein, The polarization mechanism comprises a polarization splitting component, and the polarization splitting component is arranged on one side away from the out-coupling grating of the optical waveguide; The polarization splitting component is used to split the incident natural light into the first light beam and the second light beam, wherein the first light beam and the second light beam are both linearly polarized light; The out-coupling grating is a grating that suppresses linearly polarized light beams and allows circularly polarized light beams to pass through.

9. The eyeglasses of claim 8, wherein, The first light beam is P-polarized linearly polarized light, and the second light beam is S-polarized linearly polarized light.

10. The eyeglasses of claim 1, wherein, Further comprising a light source, and the in-coupling grating and the out-coupling grating of the optical waveguide are arranged on the same side of the optical waveguide; The light emitted by the light source is incident on the optical waveguide through the in-coupling grating, propagates in the optical waveguide, and is emitted by the out-coupling grating.

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