CN114690428A - Grating waveguide display system - Google Patents
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- CN114690428A CN114690428A CN202210355756.2A CN202210355756A CN114690428A CN 114690428 A CN114690428 A CN 114690428A CN 202210355756 A CN202210355756 A CN 202210355756A CN 114690428 A CN114690428 A CN 114690428A
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- 238000003384 imaging method Methods 0.000 claims description 44
- 230000008859 change Effects 0.000 claims description 15
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 abstract description 16
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- 239000013598 vector Substances 0.000 description 34
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
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Abstract
The invention relates to an optical display device, and particularly discloses a grating waveguide display system, which comprises: a light source module for outputting projection light; the waveguide element is used for outputting the projection light after total reflection transmission; an incoupling grating disposed on a surface of the waveguide member for incoupling the projection light into the waveguide member; a driving device for adjusting the grating thickness of the coupled grating; the light source module is used for outputting projection light rays incident at different angles to the coupling grating on the waveguide element in sequence; the driving device is used for adjusting the thickness of the coupled grating to be the grating thickness corresponding to the incident angle of the projection light; the thickness of the grating corresponding to each incident angle of the projection light is the thickness of the coupled-in grating corresponding to the incident angle of the projection light when the diffraction efficiency of the coupled-in grating to the projection light is not lower than the preset efficiency. The optical display system reduces the optical energy loss of the projection light coupled into the waveguide element to a certain extent, and improves the display effect of the optical display system.
Description
Technical Field
The invention relates to the technical field of optical display devices, in particular to a grating waveguide display system.
Background
The optical waveguide device is a commonly used optical device in AR equipment or other similar display systems, and mainly has the main function of coupling projection light into the waveguide element from one end of the waveguide element through the diffraction action of the coupling-in grating, so that the projection light is transmitted in the waveguide element in a total reflection manner, and when the projection light is transmitted to one end of the waveguide element, which is provided with the coupling-out grating, the projection light is coupled out through the diffraction action of the coupling-out grating and is emitted to human eyes, and the display effect of the projection light is realized.
However, in the light path from the projection light coupled into the waveguide to the incident light to the human eye, the projection light inevitably has a loss of light energy, which is as high as 60%, and thus the luminance of the projection image finally displayed on the human eye is insufficient to some extent.
Disclosure of Invention
The invention aims to provide a grating waveguide display system which can reduce the light energy loss of projection light when the projection light is transmitted through a waveguide to a certain extent and improve the display effect of a projection picture.
To solve the above technical problem, the present invention provides a grating waveguide display system, including:
a light source module for outputting projection light;
the waveguide element is used for outputting the projection light after total reflection transmission;
an incoupling grating disposed on a surface of the waveguide member for incoupling the projection light into the waveguide member;
the driving device is used for extruding or stretching the coupling grating to different degrees so as to adjust the grating thickness of the coupling grating;
the light source module is used for outputting projection light rays incident at different angles to the coupling grating on the waveguide element in sequence;
the driving device is used for adjusting the thickness of the coupled grating to be the grating thickness corresponding to the incident angle of the projection light; the thickness of the grating corresponding to each incident angle of the projection light is the thickness of the incoupling grating corresponding to the incident angle of the projection light when the diffraction efficiency of the incoupling grating to the projection light is not lower than the preset efficiency.
Optionally, the drive means is a piezoelectric actuator or a vibrator.
Optionally, the incoupling grating is a polymer grating or a liquid crystal grating.
Optionally, the thickness of the incoupling grating is 200 um-20 nm, inclusive.
Optionally, the incoupling grating includes a first incoupling sub-grating and a second incoupling grating; the grating period of the first coupling-in sub-grating is the same as that of the second coupling-in sub-grating, and the directions of the grating inclination angles are opposite.
Optionally, the light source module includes a plurality of sets of light source sub-modules and a collimating system, and each set of light source sub-module is respectively configured to output projection light rays with different incident angles to the incoupling grating through the collimating system.
Optionally, the light source module includes an imaging chip, and imaging pixel points which are used for outputting projection light and distributed in an array are arranged on the imaging chip, wherein the imaging pixel points in the same row form a group of light source sub-modules.
Optionally, the imaging chip is a partial cylindrical surface chip or a planar chip.
Optionally, the light source module is connected with a movable component; the movable part drives the light source module to move so as to change the incident angle of the projection light output by the light source module and incident on the coupling-in grating.
Optionally, the light source module includes an imaging chip and a collimating system; the movable part is used for driving the imaging chip and the collimation system to synchronously rotate or driving the imaging chip to move on a focal plane of the collimation system so as to change the incident angle of the projection light output by the imaging chip to enter the coupling-in grating.
The invention provides a grating waveguide display system, comprising: a light source module for outputting projection light; the waveguide element is used for outputting the projection light after total reflection transmission; an incoupling grating disposed on a surface of the waveguide member for incoupling the projection light into the waveguide member; the driving device is used for extruding or stretching the coupling grating to different degrees so as to adjust the grating thickness of the coupling grating; the light source module is used for outputting projection light rays incident at different angles to the coupling grating on the waveguide element in sequence; the driving device is used for adjusting the thickness of the coupled grating to be the grating thickness corresponding to the incident angle of the projection light; the thickness of the grating corresponding to each incident angle of the projection light is the thickness of the coupled-in grating corresponding to the incident angle of the projection light when the diffraction efficiency of the coupled-in grating to the projection light is not lower than the preset efficiency.
The application considers that when the projection light is coupled into the waveguide element through the coupling-in grating, the incident angle of the projection light entering the coupling-in grating is within a certain angle range, and for the projection light with different incident angles within the angle range, the grating vectors of the coupling-in grating with the highest diffraction efficiency are different; therefore, in order to improve the diffraction efficiency of the coupling-in grating to the projection light coupled into the waveguide element as much as possible and further reduce the light energy loss in the process of coupling-in the waveguide element, when the projection light is incident to the coupling-in grating at different angles, the thickness of the coupling-in grating is changed by extruding or stretching the coupling-in grating along the thickness direction, and then the grating vector direction of the coupling-in grating is changed, so that the diffraction efficiency of the coupling-in grating to the projection light incident at the current incident angle is maximum; by analogy, the projection light rays with different angles are sequentially incident to the coupling grating, the thickness of the coupling grating is correspondingly adjusted, and finally the projection light rays with different angles can be coupled into the waveguide element with high diffraction efficiency, so that the light energy loss of the coupling grating of the projection light rays into the waveguide element is reduced to a certain extent, the utilization rate of the light energy is doubled, the brightness of the picture finally output by the waveguide element is favorably improved, and the display effect of the optical display system is improved.
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In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an optical path structure of a grating waveguide display system according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a corresponding relationship between an incident angle of a projection light and a grating vector according to an embodiment of the present disclosure.
Detailed Description
In a display device with an optical waveguide, the main function of the waveguide element is to guide the projection light, but the angle of the projection light incident on the incoupling grating on the waveguide element is within a certain range of angles, and the grating vector of the incoupling grating is fixed after the incoupling grating is formed; and for the coupled grating with fixed grating vector, the diffraction efficiency of the projected light only incident at a specific angle can reach the maximum, obviously, the light energy loss of the projected light incident at other angles is obviously increased to a certain extent, and the uniformity of the brightness of the whole projection picture is seriously even influenced.
Therefore, the incident projection light rays with different incident angles can be sequentially incident, correspondingly, when the incident grating receives the projection light rays with different incident angles, the thickness of the incident grating is correspondingly changed, the grating vector of the incident grating is further realized, the diffraction efficiency of the incident projection light rays with the angle is maximum, the high diffraction efficiency of the projection light rays is finally realized to be coupled into the waveguide element, the light energy loss of the projection light rays is further reduced to a certain extent, and the display effect of the display picture of the projection light rays is improved.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all 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.
As shown in fig. 1, fig. 1 is a schematic view of an optical path structure of a grating waveguide display system provided in an embodiment of the present application.
The grating waveguide display system may include:
a light source module 10 for outputting projection light;
a waveguide element 20 for outputting the projection light after total reflection transmission;
an incoupling grating 30 disposed on the surface of the waveguide member 20 for incoupling the projection light into the waveguide member 20;
a driving device 40 for pressing or stretching the incoupling grating 30 to different degrees to adjust the grating thickness of the incoupling grating 30;
the light source module 10 is configured to sequentially output projection light beams incident at different angles to the coupling grating 30 on the waveguide element 20;
the driving device 40 is used for adjusting the thickness of the in-coupling grating 30 to the grating thickness corresponding to the incident angle of the projection light; the grating thickness corresponding to each incident angle of the projection light is the thickness of the coupled-in grating 30 corresponding to the incident angle of the projection light when the diffraction efficiency of the coupled-in grating 30 to the projection light is not lower than the preset efficiency.
As shown in fig. 1, the main optical components of the grating waveguide display system in the present embodiment are similar to those of the conventional grating waveguide display system, and each of the optical components includes a light source module 10 for outputting projection light, a waveguide unit 20, and an incoupling grating 30 and an outcoupling grating disposed on the waveguide component; the projection light output from the light source module 10 is coupled into the waveguide 20 through the coupling-in grating 30, totally reflected in the waveguide 20, and then coupled out from the waveguide 20 through the coupling-out grating.
In contrast, on the one hand, the light source module 10 outputs projection light in a different manner. In a conventional display system, the light source module 10 outputs projection light rays within a certain angle range synchronously; in this embodiment, the projection light within a certain angle range is divided into a plurality of projection light incident at different angles, and the light source module 10 sequentially outputs the projection light incident at different angles according to a certain sequence, that is, the projection light incident at different angles is not synchronously incident to the coupling grating 30, but has a certain sequence.
On the other hand, in the conventional display system, the thickness of the incoupling grating 30 provided on the waveguide member 20 is generally constant; in the present embodiment, on the basis that the light source module 10 sequentially outputs the projection light beams incident at different angles, a driving device 40 capable of stretching and compressing the incoupling grating 30 is further provided in the present embodiment. For the incoupling grating 30, for projection light rays with different incidence angles, a grating vector is corresponding to maximize the diffraction efficiency, and the grating vector is related to the grating thickness of the incoupling grating 30. Therefore, in the present embodiment, for the projection light incident at different angles, the thickness of the coupling-in grating 30 is changed by compressing or stretching the coupling-in grating by the driving device 40, and the grating vector of the coupling-in grating 30 is further changed, so that the grating vector corresponds to the grating vector that can maximize the diffraction efficiency of the projection light incident at the current angle as much as possible.
To more clearly illustrate the relationship between the grating vector and the projection light, reference may be made to fig. 2. in the embodiment shown in fig. 2, the light source module 10 includes an imaging chip 11 having a planar structure and a collimating system 12 disposed in an output optical path of the imaging chip 11. The imaging chip 11 of the light source module 10 includes a plurality of different light-emitting portions, and the directions of angles at which the projection light output from the different light-emitting portions enters the optical grating 20 after being collimated by the collimating system 12 are different. The coupled-in grating 20 has the highest diffraction efficiency of the projection light when it satisfies the vector matching relationship that the vector of the diffracted light is equal to the vector sum of the vector of the incident light of the projection light and the vector of the grating. For convenience of explanation, in a vector triangle formed by three vectors in fig. 2, a solid line with an arrow indicates a projection light, a dotted line with an arrow indicates a grating vector, and a dotted line with an arrow indicates a vector of a diffraction light. Therefore, with the change of the incident angle of the projection light, the driving device 40 can adjust the thickness of the coupled-in grating 30, so that the grating vector of the coupled-in grating 30 changes correspondingly, the grating vector of the coupled-in grating 30 can satisfy the vector matching relationship, and the diffraction efficiency of the projection light incident at different angles is guaranteed to be the highest.
Based on the above discussion, the light source module 10 sequentially inputs the projection light beams incident at different angles to the incoupling grating 30 according to a sequence, and the driving device 40 correspondingly sequentially adjusts the thickness of the incoupling grating 30 so that the incoupling grating 30 is a corresponding grating vector under the thickness, thereby ensuring that the projection light beams incident at different angles to the incoupling grating 30 have higher diffraction efficiency in the corresponding diffraction direction, so as to increase the diffraction efficiency of the incoupling waveguide element 20 of the projection light beams to a certain extent, reduce the light energy loss, and increase the display brightness of the final display image.
It should be noted that although the projection light rays incident at different angles are incident into the waveguide element 20 in different orders, it is obvious that the display picture viewed by human eyes is a complete picture formed by projecting and incident the projection light rays incident at different angles to human eyes together; therefore, in the process of actually outputting the projection light rays incident at different angles, the light source module 10 can control the sequence of the incident time sequence of the projection light rays incident at different angles to the coupled grating 30 to have a small difference by using the persistence effect, so that the existence of the time difference can not be recognized by naked eyes, and thus, the projection light rays at different angles can present a complete projection picture.
Further, as the driving means 40 for driving the thickness variation of the incoupling grating 30, a piezoelectric actuator or a vibrator that periodically vibrates, which may be in contact with the incoupling grating 30 and make reciprocating vibrating motion, as an example of the vibrator, may be employed; in specific use, the vibrator formed by structures such as a motor and a connecting rod, a motor and a cam, a motor and a lead screw nut and the like can be selected.
In addition, in the process of adjusting the thickness of the incoupling grating 30 by the driving device 40, the thickness of the incoupling grating 30 can be changed in different ways based on the material of the incoupling grating 30.
Taking a volume holographic grating as an example, the volume holographic grating is a polymer grating in nature, the polymer grating has a certain scalability, the driving device 40 mainly extrudes the polymer grating in the process of changing the thickness of the polymer grating, and the thickness of the polymer grating is changed correspondingly by extruding the polymer grating to different degrees.
In addition, the incoupling grating 30 may also be a liquid crystal grating, and the surface of the liquid crystal grating and the surfaces of the waveguide element 20 and the driving device 40 may be tightly adhered, so that the driving device 40 may stretch the liquid crystal grating to different degrees; of course, it is understood that the driving device 40 may also change the thickness of the liquid crystal grating by pressing the liquid crystal grating, and is not particularly limited in this application.
Further, the driving device 40 may perform the extrusion and the pressing on the incoupling grating in the thickness direction of the incoupling grating 30 during the process of changing the thickness of the incoupling grating 30, and it is not excluded that the incoupling grating 30 is pressed in the direction perpendicular to the thickness direction of the incoupling grating 30 so as to apply a static friction force on the incoupling grating 30 parallel to the surface of the incoupling grating 30, so as to finally change the thickness of the incoupling grating 30, and similarly, the thickness adjustment of the incoupling grating 30 may also be implemented in various different ways, which is not listed in this application.
It should be understood that, in practical applications, it is not excluded to use gratings of other materials as the incoupling grating 30, and based on the different materials of the incoupling grating 30, the driving device 40 may change the thickness of the incoupling grating 30 in a suitable manner, so as to finally achieve the purpose of changing the grating vector of the incoupling grating 30, which is not listed in this application.
In addition, a special processor may be configured to control the driving of the driving device 40, and of course, the driving device 40 may be connected to other similar devices capable of controlling the driving function of the driving device 40, such as an upper computer and a controller, which is not limited in this application.
It should be further noted that the thickness of the coupled-in grating 30 in the present embodiment ranges from 200um to 20nm, inclusive; it can be seen that, in the present application, the thickness of the coupling-in grating 30 is relatively small, and therefore, in the process of actually extruding or stretching the coupling-in grating 30, although the area of the coupling-in grating 30 is changed to some extent due to the deformation, the area size of the coupling-in grating 30 is much larger than the thickness size, so that the area change of the coupling-in grating 30 is substantially negligible, that is, the grating period of the coupling-in grating 30 can be regarded as unchanged, and only the grating thickness is changed.
In summary, in the grating waveguide display system provided by the present application, the light source module sequentially outputs the projection light beams incident to the waveguide element at different angles according to a certain sequence, and the coupling grating on the waveguide element is adjusted by the driving device, and the grating thickness of the coupling grating can be changed along with the incident angle of the projection light beam, so that the grating vector of the coupling grating is changed, the diffraction efficiency of the diffraction coupling of the projection light beam is improved, the light energy loss is reduced, and the display effect of the projection image finally output is improved to a certain extent.
As described above, in the embodiment shown in fig. 2, the imaging chip 11 outputting the projection light in the light source module 10 is taken as a planar chip for example; and in the embodiment shown in fig. 2, the imaging chip 11 shows three projection light rays with different angles output by three different portions, but the angle difference between the projection light rays with different angles shown in fig. 2 is relatively small, and there is substantially no angle exceeding 90 degrees, and accordingly, the directional change span of the grating vector corresponding to the projection light rays with three directions is relatively small. However, in practical applications, the range of the angle interval output by the imaging chip 11 is a relatively large interval range, which requires a relatively large range of grating vector variation of the coupled grating 30; it is clear that the variation of the grating vector can be difficult to achieve at this time simply by changing the grating thickness of the incoupling grating 30. To this end, in an optional embodiment of the present application, the method may further include:
the incoupling grating 30 includes a first incoupling sub-grating and a second incoupling grating; the grating period of the first coupling-in sub-grating is the same as that of the second coupling-in sub-grating, and the inclination angles of the gratings are opposite.
The incoupling grating 30 in this embodiment is formed by a first incoupling sub-grating and a second incoupling sub-grating; assuming that the direction perpendicular to the coupling-in grating 30 is the angle 0 point, and the incident angle range of the projection light is [ -a, a ], so that the projection light with the incident angle range of (-a, 0] can be incident to the first coupling-in sub-grating, and the projection light with the incident angle range of (0, a ] can be incident to the second coupling-in sub-grating, because the grating periods of the first coupling-in sub-grating and the second coupling-in sub-grating are the same and the directions of the grating tilt angles are opposite, when the grating thicknesses of the first coupling-in sub-grating and the second coupling-in sub-grating are the same, the grating vectors of the two sub-gratings should be symmetrical about the plane perpendicular to the plane of the coupling-in grating 30, thereby realizing the large angle variation of the grating vector range under the condition that the thickness variation of the coupling-in the coupling-grating 30 is not too large.
It is understood that the embodiment is only described by taking the example that the incoupling grating 30 includes two incoupling sub-gratings. In practical applications, if the incident angle range of the projection light is too large, three, four or even more different incoupling sub-gratings are not excluded, and are respectively used for generating grating vectors that do not change within the angle range along with the change of the thickness of the incoupling sub-grating 30, so as to ensure that the projection light incident at each different angle has a corresponding incoupling sub-grating, and can be diffracted and coupled into the waveguide device 20 with high efficiency.
Further, the incoupling grating 30 may be a multiplexed grating formed by the first incoupling sub-grating and the second incoupling sub-grating together, that is, the first incoupling sub-grating and the second incoupling sub-grating still have an integral grating structure, but have two different grating vectors.
Further, referring to fig. 2, the light source module 10 shown in fig. 2 includes an imaging chip 11 having a planar structure, and a collimating system 12 disposed on an output optical path of the imaging chip 11. Each small light emitting area on the imaging chip 11 can be regarded as a light source sub-module, and the projection light beams with different angles are output by the light source sub-modules in sequence, collimated by the collimating system 12, and then incident to the incoupling grating 30.
It should be noted that, in the imaging chip 11 shown in fig. 2, each light source sub-module 10 may be an integrally formed chip structure, or may be a chip structure formed by assembling a plurality of independent light emitting chips together in the same plane.
In an alternative embodiment of the present application, the imaging chip 11 may include a plurality of imaging pixels distributed in an array for outputting the projection light, and the imaging pixels in the same column form a group of light source sub-modules.
For example, the imaging chip 11 may be regarded as a surface light source formed by a plurality of lamp beads (or pixel light emitting units) in a lattice distribution, wherein the same row of lamp beads (or pixel light emitting units) is turned on and off synchronously to form a group of light source sub-modules, and each row of lamp beads is sequentially turned on to output divergent light, and then forms projection light rays with different incident angles through the collimation effect of the collimation system 12.
It should be noted that the imaging chip 11 in the light source module 10 is not necessarily in a planar structure as shown in fig. 2, and may be in a non-planar structure. For example, the imaging chip 11 may also be a partial cylindrical surface structure, each light source submodule is a bar light source parallel to the central axis of the cylinder where the imaging chip 11 is located, and after each bar light source sequentially emits light, projection light rays at different angles may also be output through the collimating system 12.
In the above embodiments, the projection light beams at different angles are sequentially output in a manner that the position of the imaging chip 11 is unchanged and the light emitting position on the imaging chip 11 is gradually changed. In an optional embodiment of the present application, the method may further include:
the light source module 10 is connected with a movable part; the movable component drives the light source module 10 to move so as to change the incident angle of the projection light output by the light source module 10 incident to the coupled grating 30.
When the movable component drives the light source module 10 to move, the movable component can drive the light source module 10 to translate and can also drive the light source module 10 to rotate.
Take the example that the movable component drives the light source module 10 to translate; at this time, the movable component mainly drives the imaging chip 11 in the light source module 10 to translate, and at this time, the position of the collimation system 12 does not move, and the moving position of the imaging chip 11 mainly translates on the focal plane of the collimation system 12. Obviously, in this embodiment, the area size of the imaging chip 11 can be relatively smaller, and the change of the incident angle of the projection light is realized by the translation thereof.
Taking the example that the movable part drives the light source module 10 to rotate; at this time, the movable component needs to drive the imaging chip 11 and the collimating system 12 in the light source module to rotate synchronously, so as to change the direction of the projection light output by the light source module 10.
Certainly, in the present application, it is not excluded that the movable component drives the imaging chip 11 to perform the translational motion and also drives the imaging chip 11 to perform the rotational motion, but in practical applications, the motion situations of the imaging chip 11 and the collimating system 12 are relatively complex, but theoretically, the output of the projection light rays at different angles can also be realized, and details are not described in this application.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.
The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A grating waveguide display system, comprising:
a light source module for outputting projection light;
the waveguide element is used for outputting the projection light after total reflection transmission;
an incoupling grating disposed on a surface of the waveguide member for incoupling the projection light into the waveguide member;
the driving device is used for extruding or stretching the incoupling grating to different degrees so as to adjust the grating thickness of the incoupling grating;
the light source module is used for outputting projection light rays incident at different angles to the coupling grating on the waveguide element in sequence;
the driving device is used for adjusting the thickness of the coupled grating to be the grating thickness corresponding to the incident angle of the projection light; the thickness of the grating corresponding to each incident angle of the projection light is the thickness of the incoupling grating corresponding to the incident angle of the projection light when the diffraction efficiency of the incoupling grating to the projection light is not lower than the preset efficiency.
2. The grating waveguide display system of claim 1 wherein the driving means is a piezoelectric actuator or a vibrator.
3. The grating waveguide display system of claim 1 wherein the incoupling grating is a polymer grating or a liquid crystal grating.
4. The grating waveguide display system of claim 1 wherein the incoupling grating has a thickness of 200um to 20nm, inclusive.
5. The grating waveguide display system of any one of claims 1 to 4 wherein the incoupling grating comprises a first incoupling sub-grating and a second incoupling grating; the grating period of the first coupling-in sub-grating is the same as that of the second coupling-in sub-grating, and the directions of the grating inclination angles are opposite.
6. The grating waveguide display system of claim 1 wherein the light source module comprises a plurality of sets of light source sub-modules and a collimating system, each set of the light source sub-modules being respectively configured to output the projection light at different incident angles to the incoupling grating through the collimating system.
7. The grating waveguide display system of claim 6 wherein the light source module comprises an imaging chip, the imaging chip having imaging pixels disposed thereon for outputting projection light and distributed in an array, wherein the imaging pixels in a same column form a group of the light source sub-modules.
8. The grating waveguide display system of claim 7 wherein the imaging chip is a partial cylindrical chip or a planar chip.
9. The grating waveguide display system of claim 1 wherein the light source module has a movable part attached; the movable part drives the light source module to move so as to change the incident angle of the projection light output by the light source module incident to the coupling-in grating.
10. The grating waveguide display system of claim 9 wherein the light source module comprises an imaging chip and a collimating system; the movable part is used for driving the imaging chip and the collimation system to synchronously rotate or driving the imaging chip to move on a focal plane of the collimation system so as to change the incident angle of the projection light output by the imaging chip to enter the coupling-in grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355756.2A CN114690428B (en) | 2022-04-06 | Grating waveguide display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210355756.2A CN114690428B (en) | 2022-04-06 | Grating waveguide display system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114690428A true CN114690428A (en) | 2022-07-01 |
| CN114690428B CN114690428B (en) | 2024-06-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116165803A (en) * | 2023-04-20 | 2023-05-26 | 杭州光粒科技有限公司 | Waveguide display system |
| CN116400508A (en) * | 2023-05-31 | 2023-07-07 | 杭州光粒科技有限公司 | AR optical equipment |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446685A (en) * | 2007-11-29 | 2009-06-03 | 索尼株式会社 | Image display apparatus |
| US20120044572A1 (en) * | 2009-04-20 | 2012-02-23 | Bae Systems Plc | Optical waveguides |
| US20120300311A1 (en) * | 2010-01-25 | 2012-11-29 | Bae Systems Plc | Projection display |
| CN111708112A (en) * | 2020-08-20 | 2020-09-25 | 歌尔股份有限公司 | Method for manufacturing liquid crystal grating |
| CN212694110U (en) * | 2020-09-25 | 2021-03-12 | 杭州光粒科技有限公司 | Diffraction light waveguide display device and system |
| WO2021121319A1 (en) * | 2019-12-20 | 2021-06-24 | 杭州海康威视数字技术股份有限公司 | Image display method, near-eye display apparatus, and device |
| CN214335370U (en) * | 2021-03-19 | 2021-10-01 | 浙江师范大学 | Waveguide display structure for realizing uniform light emission |
| CN113721320A (en) * | 2021-09-06 | 2021-11-30 | 宁波舜宇奥来技术有限公司 | Optical waveguide structure and display device |
| CN113848648A (en) * | 2021-09-24 | 2021-12-28 | 京东方科技集团股份有限公司 | Optical transmission system and display device |
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446685A (en) * | 2007-11-29 | 2009-06-03 | 索尼株式会社 | Image display apparatus |
| US20120044572A1 (en) * | 2009-04-20 | 2012-02-23 | Bae Systems Plc | Optical waveguides |
| US20120300311A1 (en) * | 2010-01-25 | 2012-11-29 | Bae Systems Plc | Projection display |
| WO2021121319A1 (en) * | 2019-12-20 | 2021-06-24 | 杭州海康威视数字技术股份有限公司 | Image display method, near-eye display apparatus, and device |
| CN111708112A (en) * | 2020-08-20 | 2020-09-25 | 歌尔股份有限公司 | Method for manufacturing liquid crystal grating |
| CN212694110U (en) * | 2020-09-25 | 2021-03-12 | 杭州光粒科技有限公司 | Diffraction light waveguide display device and system |
| CN214335370U (en) * | 2021-03-19 | 2021-10-01 | 浙江师范大学 | Waveguide display structure for realizing uniform light emission |
| CN113721320A (en) * | 2021-09-06 | 2021-11-30 | 宁波舜宇奥来技术有限公司 | Optical waveguide structure and display device |
| CN113848648A (en) * | 2021-09-24 | 2021-12-28 | 京东方科技集团股份有限公司 | Optical transmission system and display device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116165803A (en) * | 2023-04-20 | 2023-05-26 | 杭州光粒科技有限公司 | Waveguide display system |
| CN116165803B (en) * | 2023-04-20 | 2024-03-12 | 杭州光粒科技有限公司 | Waveguide display system |
| CN116400508A (en) * | 2023-05-31 | 2023-07-07 | 杭州光粒科技有限公司 | AR optical equipment |
| CN116400508B (en) * | 2023-05-31 | 2023-09-19 | 杭州光粒科技有限公司 | AR optical equipment |
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