CN114690428B - Grating waveguide display system - Google Patents
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- CN114690428B CN114690428B CN202210355756.2A CN202210355756A CN114690428B CN 114690428 B CN114690428 B CN 114690428B CN 202210355756 A CN202210355756 A CN 202210355756A CN 114690428 B CN114690428 B CN 114690428B
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- 238000010168 coupling process Methods 0.000 claims abstract description 70
- 230000008878 coupling Effects 0.000 claims abstract description 69
- 238000005859 coupling reaction Methods 0.000 claims abstract description 69
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000003384 imaging method Methods 0.000 claims description 44
- 230000008859 change Effects 0.000 claims description 13
- 229920000642 polymer Polymers 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 239000013598 vector Substances 0.000 description 33
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 4
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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 application relates to an optical display device, in particular to 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; a coupling grating disposed on a surface of the waveguide element for coupling the projection light into the waveguide element; a drive for adjusting the thickness of the grating coupled into the grating; the light source module is used for sequentially outputting projection light rays incident at different angles to the coupling-in grating on the waveguide element; the driving device is used for adjusting the thickness of the coupling grating to be the grating thickness corresponding to the incident angle of the projection light; and when the diffraction efficiency of the coupling-in grating on the projection light is not lower than the preset efficiency, the thickness of the coupling-in grating corresponding to the incidence angle of the projection light is equal to the thickness of the coupling-in grating corresponding to the incidence angle of the projection light. The application reduces the light 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 an optical device commonly used in AR equipment or other similar display systems, and has a 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 way, 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 incident to human eyes, so that the display effect of the projection light is realized.
However, in the light path from coupling the projection light into the waveguide element to incidence to the human eye, there is an unavoidable loss of light energy, and the loss of light energy is up to 60%, which results in a problem of insufficient brightness of the projection image finally displayed on the human eye 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 rays when the projection light rays are transmitted through a waveguide to a certain extent and improve the display effect of a projection picture.
In order to solve the above technical problems, 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;
The coupling grating is arranged on the surface of the waveguide element and used for coupling the projection light into the waveguide element;
the driving device is used for extruding or stretching the coupling-in grating to different degrees so as to adjust the grating thickness of the coupling-in grating;
the light source module is used for sequentially outputting projection light rays incident at different angles to the coupling-in grating on the waveguide element;
The driving device is used for adjusting the thickness of the coupling grating to be the grating thickness corresponding to the incidence angle of the projection light; and when the diffraction efficiency of the coupling grating on the projection light is not lower than the preset efficiency, the thickness of the coupling grating corresponding to the incidence angle of the projection light is equal to the thickness of the coupling grating corresponding to the incidence angle of the projection light.
Optionally, the driving device is a piezoelectric actuator or a vibrator.
Optionally, the coupling-in grating is a polymer grating or a liquid crystal grating.
Optionally, the thickness of the coupling-in grating is 200 um-20 nm, including the end point values.
Optionally, the coupling-in grating includes a first coupling-in sub-grating and a second coupling-in grating; the grating periods of the first coupling-in sub-grating and the second coupling-in sub-grating are the same, and the directions of grating inclination angles are opposite.
Optionally, the light source module includes a plurality of groups of light source sub-modules and a collimation system, and each group of light source sub-modules is respectively used for outputting projection light rays with different incident angles to the coupling-in grating through the collimation system.
Optionally, the light source module includes an imaging chip, and imaging pixels for outputting projection light and distributed in an array are disposed on the imaging chip, where the imaging pixels in the same column form a group of light source sub-modules.
Optionally, the imaging chip is a partial cylindrical chip or a planar chip.
Optionally, the light source module is connected with a movable component; the movable component drives the light source module to move so as to change the incidence angle of the projection light outputted by the light source module to the coupling grating.
Optionally, the light source module comprises an imaging chip and a collimation system; the movable component is used for driving the imaging chip and the collimation system to synchronously rotate or driving the imaging chip to move on the focal plane of the collimation system so as to change the incidence angle of the projection light output by the imaging chip to the coupling grating.
The grating waveguide display system provided by the invention comprises: a light source module for outputting projection light; the waveguide element is used for outputting the projection light after total reflection transmission; a coupling grating disposed on a surface of the waveguide element for coupling the projection light into the waveguide element; the driving device is used for extruding or stretching the coupling-in grating to different degrees so as to adjust the thickness of the coupling-in grating; the light source module is used for sequentially outputting projection light rays incident at different angles to the coupling-in grating on the waveguide element; the driving device is used for adjusting the thickness of the coupling grating to be the grating thickness corresponding to the incident angle of the projection light; and when the diffraction efficiency of the coupling-in grating on the projection light is not lower than the preset efficiency, the thickness of the coupling-in grating corresponding to the incidence angle of the projection light is equal to the thickness of the coupling-in grating corresponding to the incidence angle of the projection light.
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 to the coupling-in grating is within a certain angle range, and the corresponding grating vectors of the coupling-in grating with highest diffraction efficiency are different for the projection light with different incident angles within the angle range; therefore, in order to improve the diffraction efficiency of the coupling grating on the projection light coupled into the waveguide element as much as possible, and further reduce the light energy loss in the coupling process of the waveguide element, when the projection light is incident into the coupling grating at different angles, the thickness of the coupling grating is changed by extruding or stretching the coupling grating along the thickness direction, so that the grating vector direction of the coupling grating is changed, and the diffraction efficiency of the coupling grating on the projection light incident at the current incident angle is maximized; and the like, so that the projection light rays with different angles are sequentially incident to the coupling-in grating, the thickness of the coupling-in grating is correspondingly adjusted, finally, the projection light rays with different angles can be coupled into the waveguide element with high diffraction efficiency, the light energy loss of the projection light rays coupled into the waveguide element is reduced to a certain extent, the utilization rate of light energy is improved in a multiplied way, the brightness of a picture finally output by the waveguide element is improved, and the display effect of the optical display system is further improved.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an optical path structure of a grating waveguide display system according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a correspondence relationship between an incident angle of a projection light ray and a grating vector according to an embodiment of the present application.
Detailed Description
In a display device with an optical waveguide, the main function of the waveguide element is to conduct the projection light, but the angle of the coupling-in grating, at which the projection light is incident on the waveguide element, is within a certain angular range, and the grating vector of the coupling-in grating is fixed after the coupling-in grating is formed; and the coupling grating with fixed grating vector can only maximize the diffraction efficiency of the projection light rays incident at a specific angle, obviously, the light energy loss of the projection light rays incident at other angles is obviously increased to a certain extent, and the uniformity of the brightness of the whole projection picture is seriously and even influenced.
Therefore, the application thinks that the projection light rays incident at different angles can be sequentially incident in sequence, correspondingly, when the coupling grating receives the projection light rays at different angles, the thickness of the coupling grating is correspondingly changed, thereby realizing the grating vector of the coupling grating, maximizing the diffraction efficiency of the projection light rays incident at the angles, finally realizing the coupling of the projection light rays with high diffraction efficiency to the waveguide element, further reducing the light energy loss of the projection light rays to a certain extent, and improving the display effect of the display picture of the projection light rays.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, fig. 1 is a schematic diagram of an optical path structure of a grating waveguide display system according to 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 transmitting the projected light by total reflection and outputting the transmitted light;
a coupling-in grating 30 provided on the surface of the waveguide 20 for coupling the projection light into the waveguide 20;
a driving means 40 for compressing or stretching the coupling-in grating 30 to different degrees to adjust the grating thickness of the coupling-in grating 30;
The light source module 10 is configured to sequentially output projection light rays incident at different angles to the coupling-in grating 30 on the waveguide element 20;
The driving device 40 is used for adjusting the thickness of the coupling grating 30 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 coupling-in grating 30 corresponding to the incident angle of the projection light when the diffraction efficiency of the coupling-in grating 30 on the projection light is not lower than the preset efficiency.
As shown in fig. 1, for the main optical elements in the grating waveguide display system of the present embodiment, which are similar to those in the conventional grating waveguide display system, the light source module 10, which outputs the projection light, the waveguide unit 20, and the coupling-in grating 30 and the coupling-out grating disposed on the waveguide element are included; the projection light outputted from the light source module 10 is coupled into the waveguide element 20 through the coupling-in grating 30, and is coupled out of the waveguide element 20 through the coupling-out grating after total reflection occurs in the waveguide element 20.
In contrast, on the one hand, the manner in which the light source module 10 outputs the projection light is different. In the conventional display system, the light source module 10 synchronously outputs projection light within a certain angle range; in the present 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 incident to the coupling-in grating 30 synchronously, but has a certain sequence.
On the other hand, in conventional display systems, the thickness of the incoupling grating 30 provided on the waveguide element 20 is generally constant; in this embodiment, on the basis that the light source modules 10 sequentially output the projection light rays incident at different angles, a driving device 40 capable of stretching and extruding the coupling-in grating 30 is further provided. For the coupling-in grating 30, it corresponds to a grating vector that maximizes the diffraction efficiency for the projected light at different angles of incidence, and the grating vector is related to the grating thickness of the coupling-in grating 30. For this reason, in the present embodiment, the thickness of the coupling grating 30 is changed by extruding or stretching the coupling grating by the driving device 40 for the projection light incident at different angles, so as to change the grating vector of the coupling grating 30, so that the grating vector corresponds to the grating vector of the maximum diffraction efficiency of the projection light incident at the current angle as much as possible.
For a clearer description of the relationship between the grating vectors 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 of planar structure and a collimation system 12 disposed on the output light 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 projection light beams output by the different light emitting portions are collimated by the collimating system 12 and then incident into the coupling grating 20 in different angular directions. The projected light diffraction efficiency is highest for the coupling-in grating 20 when it satisfies the vector matching relationship that the vector of the diffracted light is equal to the vector sum of the vector addition of the incident light vector of the projected light and the grating vector. For convenience of explanation, in a vector triangle enclosed by three vectors in fig. 2, a projected light is represented by a solid line with an arrow, a grating vector is represented by a dotted line with an arrow, and a vector of diffracted light is represented by a dotted line with an arrow. Therefore, along with the variation of the incident angle of the projection light, the driving device 40 can adjust the thickness of the coupling grating 30, so that the grating vector of the coupling grating 30 is correspondingly changed, the grating vector of the coupling grating 30 can meet the vector matching relationship, and the highest diffraction efficiency of the projection light incident at different angles is ensured.
Based on the above discussion, the light source module 10 sequentially inputs the projection light rays incident at different angles to the coupling-in grating 30, and the driving device 40 sequentially adjusts the thickness of the coupling-in grating 30 correspondingly so that the coupling-in grating 30 is a corresponding grating vector under the thickness, thereby ensuring that the projection light rays incident to the coupling-in grating 30 at different angles have higher diffraction efficiency in the corresponding diffraction directions, improving the diffraction efficiency of the coupling-in waveguide element 20 of the projection light rays to a certain extent, reducing light energy loss, and improving the display brightness of the final display picture.
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 screen viewed by the human eye finally is a complete screen formed by the projection light rays incident at different angles together projected and incident to the human eye; therefore, in the process of actually outputting the projection light rays incident at different angles, the light source module 10 can utilize the persistence effect to control the sequential time sequence of the projection light rays incident at different angles to the coupling grating 30 to have smaller phase difference, so that the naked eyes cannot recognize the time difference, and thus the projection light rays at different angles can show a complete projection picture.
Further, for the driving device 40 for driving the thickness variation of the coupling grating 30, a piezoelectric brake or a vibrator periodically vibrating, for example, a vibrator may be used, which may be in contact with the coupling grating 30 and perform a reciprocating vibration motion; in specific use, a vibrator composed of a motor and a connecting rod, a motor and a cam, a motor and a screw nut and the like can be selected.
In addition, in the process of adjusting the thickness of the coupling-in grating 30 by the driving device 40, the thickness of the coupling-in grating 30 can be changed in different manners based on different materials of the coupling-in grating 30.
Taking a volume holographic grating as an example, the volume holographic grating is a polymer grating, 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 correspondingly changed by extruding the polymer grating to different degrees.
In addition, the coupling grating 30 may be a liquid crystal grating, and the surface of the liquid crystal grating, the surface of the waveguide element 20 and the surface of 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 implement the thickness change of the liquid crystal grating by pressing the liquid crystal grating, and the present application is not limited thereto.
Further, the driving device 40 may press and stretch the coupling grating in the thickness direction of the coupling grating 30 during changing the thickness of the coupling grating 30, and does not exclude that the coupling grating 30 is pressed in the thickness direction perpendicular to the coupling grating 30, so that a static friction force parallel to the surface of the coupling grating 30 is applied to the coupling grating 30, and finally, the thickness of the coupling grating 30 is changed, and similarly, the thickness adjustment of the coupling grating 30 may be implemented in various different manners, which is not listed in the present application.
It should be understood that, in practical applications, the use of gratings made of other materials as the coupling grating 30 is not excluded, and the thickness of the coupling grating 30 may be changed by the driving device 40 in a suitable manner based on the different materials of the coupling grating 30, so as to achieve the purpose of changing the grating vector of the coupling grating 30.
The driving of the driving device 40 may be controlled by a dedicated processor, and of course, the driving device 40 may be connected to a host computer, a controller, or other similar devices capable of controlling the driving function of the driving device 40, and the present application is not particularly limited.
It should be further noted that, in the present embodiment, the thickness of the coupling-in grating 30 ranges from 200um to 20nm, including the end point values; therefore, the thickness of the coupling-in grating 30 is relatively small, so that, during the actual extrusion or stretching of the coupling-in grating 30, although there is a certain change in the area due to the deformation of the coupling-in grating 30, the area of the coupling-in grating 30 is much larger than the thickness, so that the change in the area of the coupling-in grating 30 is substantially negligible, that is, the grating period of the coupling-in grating 30 is regarded as unchanged, and only the grating thickness thereof is changed.
In summary, in the grating waveguide display system provided by the application, the light source module sequentially outputs the projection light rays incident to the waveguide element at different angles according to a certain sequence, the coupling grating on the waveguide element is adjusted by the driving device, the grating thickness of the coupling grating can correspondingly change along with the incident angle of the projection light rays, so that the grating vector of the coupling grating is changed, the diffraction efficiency of diffraction coupling of the projection light rays is improved, the light energy loss is reduced, and the display effect of the finally output projection picture is improved to a certain extent.
As described above, in the embodiment shown in fig. 2, the imaging chip 11 for outputting the projection light in the light source module 10 is taken as a planar chip as an example; in the embodiment shown in fig. 2, the imaging chip 11 outputs three projection light rays with different angles from three different portions, but the angle difference between the three projection light rays with different angles shown in fig. 2 is relatively small, and basically no angle exceeding 90 degrees is formed, and accordingly, the direction change span of the grating vector corresponding to the three projection light rays with different directions is relatively small. However, in the practical application process, the range of the angle interval output by the imaging chip 11 is a relatively large interval range, which also requires a relatively large range of variation of the grating vector coupled into the grating 30; it is apparent that it may be difficult to achieve the changing requirements of the grating vector by only changing the grating thickness of the incoupling grating 30 at this time. To this end, in an alternative embodiment of the present application, it may further include:
The incoupling grating 30 comprises a first incoupling sub-grating and a second incoupling grating; the grating periods of the first coupling-in sub-grating and the second coupling-in sub-grating are the same, and the directions of grating inclination angles are opposite.
The coupling-in grating 30 in the present embodiment is formed by a first coupling-in sub-grating and a second coupling-in sub-grating; it is assumed that the angle 0 point is perpendicular to the coupling-in grating 30 and the angle range of incidence of the projection light is [ -a, a ], so that the projection light with the angle range (-a, 0) can be incident on the first coupling-in sub-grating and the projection light with the angle range (0, a) can be incident on the second coupling-in sub-grating.
It should be understood that the present embodiment is only described by taking the coupling-in grating 30 including two coupling-in sub-gratings as an example. In the practical application process, if the incident angle range of the projection light is too large, it is not excluded to set three, four or even more different coupling sub-gratings, which are respectively used for generating grating vectors with different angle ranges along with the thickness change of the coupling grating 30, so as to ensure that the projection light incident at different angles has corresponding coupling sub-gratings and can be subjected to high-efficiency diffraction coupling on the projection light into the waveguide element 20.
Further, for the coupling-in grating 30, it may be a multiplexing grating formed by the first coupling-in sub-grating and the second coupling-in sub-grating together, that is, the first coupling-in sub-grating and the second coupling-in sub-grating are still a unitary grating structure, but have two different grating vectors at the same time.
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 light path of the imaging chip 11. Each small light emitting area on the imaging chip 11 may be regarded as a light source sub-module, and the projection light beams sequentially output at different angles through each light source sub-module are collimated by the collimating system 12 and then are incident to the coupling-in 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 mutually 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 for outputting projection light and distributed in an array, and the same column of imaging pixels forms 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 light beads (or pixel light emitting units) in a lattice distribution, wherein the same column of light beads (or pixel light emitting units) are synchronously turned on and off to form a group of light source sub-modules, and each column of light 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 configured in a planar manner as shown in fig. 2, and may be configured in a non-planar manner. For example, the imaging chip 11 may also be a partial cylindrical surface structure, each light source sub-module is a strip light source parallel to the central axis of the cylinder where the imaging chip 11 is located, and after each strip light source emits light sequentially, projection light rays with different angles can also be output through the collimation system 12.
In the above embodiments, the projection light beams with 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 changed step by step. In an alternative embodiment of the present application, it may further include:
the light source module 10 is connected with a movable component; the movable component drives the light source module 10 to move so as to change the incident angle of the projection light outputted by the light source module 10 to the coupling-in 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 drive the light source module 10 to rotate.
Taking the example that the movable part 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, but the position of the collimation system 12 does not move at this time, 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 of the imaging chip 11 may be relatively smaller in size, and the change in the incident angle of the projection light is achieved by the translation thereof.
Taking the example that the movable part drives the light source module 10 to rotate; at this time, the movable member needs to drive the imaging chip 11 and the collimator system 12 in the light source module to rotate synchronously, thereby changing the direction of the projection light outputted from the light source module 10.
Of course, the application does not exclude that the movable component drives the imaging chip 11 to perform translational motion and simultaneously drives the imaging chip 11 to perform rotational motion, but in practical application, the movement conditions of the imaging chip 11 and the collimation system 12 are relatively complex, but in theory, the output of projection light rays with different angles can also be realized, which is not described in detail in the application.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 is inherent to. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In addition, the parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of the corresponding technical solutions in the prior art, are not described in detail, so that redundant descriptions are avoided.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
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;
The coupling grating is arranged on the surface of the waveguide element and used for coupling the projection light into the waveguide element;
the driving device is used for extruding or stretching the coupling-in grating to different degrees so as to adjust the grating thickness of the coupling-in grating;
the light source module is used for sequentially outputting projection light rays incident at different angles to the coupling-in grating on the waveguide element;
The driving device is used for adjusting the thickness of the coupling grating to be the grating thickness corresponding to the incidence angle of the projection light, and enabling the projection light incident on different thicknesses of the coupling grating to have vision residues; the thickness of the grating corresponding to each incidence angle of the projection light is the thickness of the coupling grating corresponding to the incidence angle of the projection light when the diffraction efficiency of the coupling grating on the projection light is not lower than the preset efficiency;
the thickness of the coupling-in grating is 200 um-20 nm, including the end point value.
2. The grating waveguide display system of claim 1, wherein the driving means is a piezoelectric actuator or vibrator.
3. The grating waveguide display system of claim 1, wherein the incoupling grating is a polymer grating or a liquid crystal grating.
4. A grating waveguide display system according to any of claims 1 to 3, wherein the incoupling grating comprises a first incoupling sub-grating and a second incoupling grating; the grating periods of the first coupling-in sub-grating and the second coupling-in sub-grating are the same, and the directions of grating inclination angles are opposite.
5. The grating waveguide display system of claim 1, wherein the light source module comprises a plurality of groups of light source sub-modules and a collimating system, each group of light source sub-modules being configured to output projection light rays of different angles of incidence to the incoupling grating through the collimating system, respectively.
6. The grating waveguide display system according to claim 5, wherein the light source module comprises an imaging chip, and imaging pixels for outputting projection light are arranged on the imaging chip and distributed in an array, wherein the imaging pixels in the same column form a group of the light source sub-modules.
7. The grating waveguide display system of claim 6, wherein the imaging chip is a partial cylindrical chip or a planar chip.
8. The grating waveguide display system of claim 1, wherein the light source module has a movable member attached thereto; the movable component drives the light source module to move so as to change the incidence angle of the projection light outputted by the light source module to the coupling grating.
9. The grating waveguide display system of claim 8, wherein the light source module comprises an imaging chip and a collimation system; the movable component is used for driving the imaging chip and the collimation system to synchronously rotate or driving the imaging chip to move on the focal plane of the collimation system so as to change the incidence angle of the projection light output by the imaging chip to the coupling grating.
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