CN214409452U - Optical waveguide element and near-to-eye display device - Google Patents
Optical waveguide element and near-to-eye display device Download PDFInfo
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- CN214409452U CN214409452U CN202120617643.6U CN202120617643U CN214409452U CN 214409452 U CN214409452 U CN 214409452U CN 202120617643 U CN202120617643 U CN 202120617643U CN 214409452 U CN214409452 U CN 214409452U
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Abstract
An optical waveguide element and a near-eye display device. The optical waveguide element includes an optical incoupling reflective surface, a waveguide medium, and a plurality of first transflective portions. An included angle between the light in-coupling reflection surface and the light incident surface of the optical waveguide element is larger than 0 degree and smaller than 90 degrees, the light in-coupling reflection surface is configured to reflect light rays incident to the light in-coupling reflection surface through the light incident surface to a first surface of the waveguide medium, the first surface is opposite to the light incident surface, and the incident angle of the light rays incident to the first surface is not smaller than a total reflection critical angle thetac; the light incoupling reflective surface is a specular reflective surface such that the field of view of light incident to the light incident surface is ± (90- θ c). The utility model provides a set up the optical coupling reflection plane as the specular reflection plane among the optical waveguide component, can increase the visual field of the light of incidenting light waveguide component.
Description
Technical Field
At least one embodiment of the present invention relates to an optical waveguide element and a near-eye display device.
Background
A near-eye display device (e.g., a head-mounted display) includes components such as an image source and optical elements. Currently, as the application of near-eye display devices becomes more and more widespread, the field of view (FOV) desired by people for the near-eye display devices also gradually increases, and the influence of optical elements in the near-eye display devices on the desired field of view is larger.
SUMMERY OF THE UTILITY MODEL
At least one embodiment of the present invention provides an optical waveguide element and a near-to-eye display device. The utility model provides a set up the optical coupling reflection face as the specular reflection face among the optical waveguide component, rather than the optical coupling reflection face as the internal reflection face, can increase the visual field of the light of incidenting light waveguide component.
At least one embodiment of the present invention provides an optical waveguide element, including: the light is coupled into the reflective surface, the waveguide medium, and a plurality of first transflective portions arranged in a first direction. One part of the light transmitted to each of the plurality of first transflective portions is reflected by the first transflective portion out of the light emitting surface of the optical waveguide element, and the other part of the light transmitted to each of the plurality of first transflective portions is transmitted through the first transflective portion and then is continuously transmitted in the optical waveguide element. An included angle between the light incoupling reflecting surface and the light incident surface of the optical waveguide element is greater than 0 degrees and less than 90 degrees, the light incoupling reflecting surface is configured to reflect light rays incident to the light incoupling reflecting surface through the light incident surface to a first surface of the waveguide medium, the first surface is opposite to the light incident surface, and an incident angle of the light rays incident to the first surface is not less than the total reflection critical angle thetac; the light incoupling reflecting surface is a mirror reflecting surface so that the range of the view field of the light incident to the light incident surface is +/-90-theta c.
For example, in some examples, an angle between the reflection surface of at least one of the first transflective portions and the light exit surface is greater than 0 ° and less than 90 °.
For example, in some examples, the optical waveguide element further includes a plurality of second transflective portions arranged in a second direction, the plurality of second transflective portions being located on a light incident side of the plurality of first transflective portions, each of the second transflective portions being non-parallel to each of the first transflective portions, the plurality of second transflective portions being configured to reflect a portion of the light propagating into each of the second transflective portions toward the plurality of first transflective portions, the first direction and the second direction intersecting.
For example, in some examples, the light incoupling reflective surface is disposed on a second surface of the waveguide medium, and an included angle between the first surface and the second surface is greater than 90 °, and an incident angle of a light ray incident on the light incoupling reflective surface is not greater than the critical angle for total reflection.
For example, in some examples, the waveguide medium further includes a third surface opposite the first surface and parallel to each other, the third surface including the entrance face, and the second surface connecting the third surface and the first surface.
For example, in some examples, the light incoupling reflective surface comprises a reflective enhancement film.
For example, in some examples, the second surface is an outer surface of the waveguide medium, and a side of the light incoupling reflective surface remote from the second surface is provided with a protective layer.
At least one embodiment of the utility model provides a near-to-eye display device, including any optical waveguide component of the aforesaid, near-to-eye display device still includes: an image source; and a light adjusting element located at a light emitting side of the image source and configured to adjust a direction of image light emitted from the image source. The light guide element is positioned on the light emitting side of the light ray adjusting element, and the light rays emitted from the light ray adjusting element are configured to enter the light guide element and exit from the light emitting surface of the light guide element after being reflected for multiple times in the light guide element.
For example, in some examples, the image source includes a plurality of sub-display regions, the light adjustment element includes a plurality of light adjustment structures, the plurality of sub-display regions and the plurality of light adjustment structures are in one-to-one correspondence, and image light emitted by each sub-display region is configured to exit the corresponding light adjustment structure.
For example, in some examples, the light adjustment element further comprises: a coupling lens located on a side of the plurality of light ray modification structures facing the optical waveguide element. The light rays emitted from the plurality of light ray adjusting structures are incident to the light incident surface of the optical waveguide element through the coupling lens.
Drawings
In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings of the embodiments will be briefly described below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention, and are not intended to limit the present invention.
Fig. 1 is a schematic partial cross-sectional structure diagram of a near-eye display device according to an embodiment of the present invention;
fig. 2 is a diagram of an optical path when light incident on a light incoupling reflective surface of an optical waveguide element is totally reflected;
fig. 3 is a diagram of an optical path when light incident on a light incoupling reflective surface of an optical waveguide element is specularly reflected;
fig. 4 is a schematic view of a partial structure of an optical waveguide component according to an example of the present invention; and
fig. 5 is a schematic partial cross-sectional structure diagram of a near-eye display device according to another example of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
An embodiment of the utility model provides an optical waveguide component and near-to-eye display device. The optical waveguide element includes: the light is coupled into the reflective surface, the waveguide medium, and a plurality of first transflective portions arranged in a first direction. One part of the light transmitted to each of the plurality of first transflective portions is reflected by the first transflective portion out of the light emitting surface of the optical waveguide element, and the other part of the light transmitted to each of the plurality of first transflective portions is transmitted through the first transflective portion and then is continuously transmitted in the optical waveguide element. An included angle between the light incoupling reflecting surface and the light incident surface of the optical waveguide element is greater than 0 degrees and less than 90 degrees, the light incoupling reflecting surface is configured to reflect light rays incident to the light incoupling reflecting surface through the light incident surface to a first surface of the waveguide medium, the first surface is opposite to the light incident surface, and an incident angle of the light rays incident to the first surface is not less than the total reflection critical angle thetac; the light incoupling reflecting surface is a mirror reflecting surface so that the range of the view field of the light incident to the light incident surface is +/-90-theta c. The utility model provides a set up the optical coupling reflection face as the specular reflection face among the optical waveguide component, rather than the optical coupling reflection face as the internal reflection face, can increase the visual field of the light of incidenting light waveguide component.
The following describes an optical waveguide element and a near-eye display device provided by embodiments of the present invention with reference to the drawings.
Fig. 1 is a schematic partial cross-sectional structure diagram of a near-eye display device according to an embodiment of the present invention. As shown in fig. 1, the near-eye display device includes an image source 100, a light adjusting element 200, and a light guide element 300. The light adjusting element 200 is located at a light emitting side of the image source 100 and configured to adjust a direction of image light emitted from the image source 100; the optical waveguide element 300 is located on the light emitting side of the light adjustment element 200, and the light emitted from the light adjustment element 200 is configured to enter the optical waveguide element 300, and to be reflected multiple times in the optical waveguide element 300 and then to be emitted from the light emitting surface 301 of the optical waveguide element 300. The optical waveguide element 300 includes an optical incoupling reflective surface 310 and a waveguide medium 320, the optical incoupling reflective surface 310 is a mirror reflective surface, and an included angle between the optical incoupling reflective surface 310 and the light incident surface 302 of the optical waveguide element 300 is greater than 0 ° and less than 90 °. The light in-coupling reflection surface 310 is configured to reflect the light incident on the light in-coupling reflection surface 310 through the light in-coupling surface 302 to the first surface 303 of the waveguide medium 320, the first surface 303 is opposite to the light in-coupling surface 302, and an incident angle of the light incident on the first surface 303 is not less than a critical angle of total reflection.
For example, as shown in fig. 1, the image source 100 includes a plurality of sub-display regions 110; the light ray adjustment element 200 includes a plurality of light ray adjustment structures 210, a plurality of sub-display regions 110 and the plurality of light ray adjustment structures 210 are in one-to-one correspondence, and the image light emitted from each sub-display region 110 is configured to exit from the corresponding light ray adjustment structure 210.
For example, as shown in fig. 1, light emitted from the image source 100 passes through the light adjusting element 200, enters the waveguide medium 320, and is totally reflected in the waveguide medium 320. For example, the waveguide medium 320 is made of a material that performs the function of a waveguide, typically a transparent material with a refractive index greater than 1. For example, the material of the waveguide medium 320 may include one or more of silicon dioxide, lithium niobate, high molecular polymer, glass, and the like.
For example, the refractive index of the waveguide medium 320 is n1, the refractive index of the light-phobic medium (e.g., air) other than the waveguide medium 320 is n2, the light passes through the light incident surface 302 of the optical waveguide element 300 and enters the light incoupling reflection surface 310, and the incident angle when the light reflected by the light incoupling reflection surface 310 enters the first surface 303 is not less than the total reflection critical angle θ c (n2/n1), so that the light satisfies the total reflection condition.
The term "specular reflection surface" refers to a specular reflection surface on which light is incident, rather than a total reflection. Image light emitted by an image source enters an optical coupling reflection surface of the optical waveguide element after passing through the light ray adjusting element, the light rays entering the optical coupling reflection surface are reflected to the first surface of the optical waveguide element by the reflection surface, and the incident angle of the light rays entering the optical coupling reflection surface is not limited by the critical angle of total reflection.
Fig. 2 is a diagram of an optical path when light incident on a light incoupling reflective surface of an optical waveguide element is totally reflected. As shown in fig. 2, when a light beam enters the light incoupling reflective surface 12 after passing through the light incident surface 11 of the optical waveguide element, and is totally reflected on the light incoupling reflective surface 12, an incident angle θ 1 of the light beam entering the light incoupling reflective surface 12 is not less than a total reflection critical angle θ c, and an incident angle θ 2 of the light beam reflected by the light incoupling reflective surface 12 to the surface 13 of the waveguide medium is not less than the total reflection critical angle θ c. The solid arrows shown in fig. 2 incident on the light incoupling reflective surface 12 indicate light rays at extreme positions, and when an incident angle θ 1 of the light rays incident on the light incoupling reflective surface 12 is smaller than a critical angle for total reflection θ c, total reflection cannot occur on the light incoupling reflective surface 12. The other limit position of the light incident on the optical waveguide element is a position (dotted arrow) when the light is incident parallel to the light incoupling reflective surface 12 as shown in fig. 2, and thus the field of view FOV of the light incident on the light incident surface of the optical waveguide element is ± (90- θ c)/2.
Fig. 3 is a diagram showing an optical path when a light ray incident on the light incoupling reflective surface of the optical waveguide element is specularly reflected. As shown in fig. 3, when light is incident on the light incoupling reflective surface 12, specular reflection occurs on the light incoupling reflective surface 12, and then an incident angle θ 1 'of the light incident on the light incoupling reflective surface 12 does not need to satisfy a critical condition for total reflection, but an incident angle θ 2' of the light reflected by the light incoupling reflective surface 12 to the surface 13 of the waveguide medium needs to be not less than a critical angle for total reflection θ c. The solid arrows shown in fig. 3 incident on the light incoupling reflective surface 12 indicate light rays at the extreme positions, and when the incident angle θ 1 'of light rays incident on the light incoupling reflective surface 12 increases, the incident angle θ 2' of light rays reflected by the light incoupling reflective surface 12 to the surface 13 of the waveguide medium will be smaller than the total reflection critical angle θ c, resulting in that the light rays cannot be totally reflected on the surface 13 of the waveguide medium. The other limit position of the light ray incident on the light incident surface 11 of the optical waveguide element is a position of a dotted arrow shown in fig. 3, and at this time, after the light ray at an angle shown by the dotted arrow is incident on the light incoupling reflection surface 12, the light ray reflected by the light incoupling reflection surface 12 is parallel to the surface 13 of the waveguide medium, and the light ray cannot be incident on the surface 13 of the waveguide medium. Thus, the field of view FOV' of the light rays incident on the light incident surface of the optical waveguide element is ± (90- θ c).
Can know by the comparison of fig. 2 and fig. 3, adopt the total reflection principle for the optical incoupling face in the optical waveguide component, the embodiment of the utility model provides an optical incoupling plane of reflection among the optical waveguide component utilizes the specular reflection principle, can increase the visual field of the light of incidenting to the optical waveguide component to both can increase the luminance of the image light of the image source coupling optical waveguide component, can also reduce the tolerance of the accurate position of the light of image source coupling optical waveguide component.
For example, in the optical waveguide device provided in the embodiments of the present invention, the range of the angle of view incident on the light incident surface of the optical waveguide device is ± (90- θ c).
For example, fig. 1 schematically shows that the light incident surface 302 and the light emitting surface 301 of the optical waveguide device 300 are located on the same side of the optical waveguide device 300, for example, both are located on a side surface of the optical waveguide device 300 facing the image source 100, but not limited thereto, the light incident surface and the light emitting surface of the optical waveguide device may also be located on both sides of the optical waveguide device.
For example, as shown in fig. 1, the optical waveguide element 300 further includes a plurality of first transflective portions 330, a part of the light transmitted to each of the first transflective portions 330 in the plurality of first transflective portions 330 is reflected by the first transflective portion 330 out of the light-emitting surface 301, and another part of the light transmitted to each of the first transflective portions 330 is transmitted through the first transflective portion 330 and then continuously transmitted in the optical waveguide element 300. For example, the plurality of first transflective portions 330 are arranged along a first direction (i.e., a Y direction shown in fig. 1).
The embodiment of the utility model provides an optical waveguide component adopts a plurality of first portions of turning through as the optical outcoupling structure, is favorable to increasing the visual field of coupling at the image of user's eyes, and increase user's eyes observes the scope of image. The utility model discloses to regard as the optical coupling reflecting surface of specular reflection face and a plurality of first transflective portions as optical coupling out-of-structures to combine, through the visual field of the light of increase incidence to optical waveguide component, further increase the visual field of the image of coupling on user's eyes.
For example, as shown in fig. 1, the optical waveguide element 300 includes two first and second main surfaces opposite to each other with the plurality of first transflective portions 330 therebetween. For example, the two main surfaces of the optical waveguide element 300 are parallel to each other. For example, at least part of both main surfaces of the optical waveguide element 300 are both main surfaces (i.e., the first surface 303 and the later-mentioned third surface 305) of the waveguide medium 320. For example, light incident into the optical waveguide element 300 propagates by total reflection on both main surfaces of the waveguide medium 320, but there may be partial non-total reflection, such as specular reflection.
For example, as shown in fig. 1, the light totally reflected to each first transflective portion 330 is transmitted and reflected on the first transflective portion 330. For example, a part of the light incident on the surface of the first transflective portion 330 is reflected by the first transflective portion 330 out of the optical waveguide element 300, and the part of the light exits from the light exiting surface 301 of the optical waveguide element 300, for example, to the user; another part of the light incident on the surface of the first transflective portion 330 is transmitted by the first transflective portion 330, then continuously propagates to the next first transflective portion 330 by total reflection, and is transmitted and reflected on the next first transflective portion 330, and the transmitted light continuously propagates to one first transflective portion 330 farthest from the image source 100 by total reflection (for example, the light sequentially passes through the plurality of first transflective portions and is transmitted to the one first transflective portion farthest from the image source). For example, all or part of the light rays propagating to a first transflective portion 330 farthest from the image source 100 may be reflected by the first transflective portion 330.
For example, as shown in fig. 1, orthographic projections of adjacent first transflective portions 330 on the light emitting surface 301 are connected or partially overlapped. For example, the embodiment of the present invention schematically illustrates that the orthographic projections of the adjacent first transflective portions 330 on the light emitting surface 301 meet each other, so that a dark region without light can be avoided between the two first transflective portions 330. But not limited thereto, the orthographic projections of the adjacent first transflective portions on the light emitting surface can be partially overlapped to avoid the weakening of the light at the edge of the first transflective portion, and the light emitting can be more uniform through the overlapping of the first transflective portions.
For example, as shown in FIG. 1, the first transflective portion 330 may be disposed in the waveguide medium 320 by plating or pasting.
For example, as shown in fig. 1, a portion of the waveguide medium 320 far from the image source 100 may be divided into a plurality of cylinders (i.e., a plurality of parallelogram cylinders stacked) with a parallelogram cross section (i.e., a cross section parallel to the XY plane shown in fig. 1), a first transflective portion 330 is disposed between the spliced cylinders, a medium between adjacent first transflective portions 330 may be the waveguide medium 320, and the first transflective portions 330 are configured to couple a portion of light out of the optical waveguide element by reflecting to destroy a total reflection condition of the portion of light. Of course, the embodiment of the present invention is not limited to the first transparent portion and adopts the mode of plating or pasting and covering to set up on the surface of parallelogram's cylinder, and the first transparent portion also can be the surface that two adjacent parallelogram's cylinder were laminated each other.
For example, as shown in fig. 1, the plurality of first transflective portions 330 may be arranged at equal intervals.
For example, as shown in fig. 1, the plurality of first transflective portions 330 may be disposed parallel to each other, and in this case, the light emitted from the plurality of first transflective portions is parallel light. However, the embodiment of the utility model provides a be not limited to this, a plurality of first portions of reflecting can also be nonparallel, through adjusting the contained angle between a plurality of first portions of reflecting, can be with the light adjustment of a plurality of first portions of reflecting outgoing for convergent light or divergent light.
For example, an included angle between each first transflective portion 330 and the light emitting surface is greater than 0 ° and less than 90 °. For example, the included angle between each first transflective portion 330 and the light emitting surface is 30 ° to 60 °. For example, the included angle between each first transflective portion 330 and the light emitting surface may be 40 ° to 50 °. The included angle between each first transflective portion 330 and the light-emitting surface is 45 °
For example, as shown in fig. 1, an angle between the light incoupling reflective surface 310 and the light emitting surface 301 is a first angle, and an angle between the reflective surface of at least one of the first transflective portions 330 and the light emitting surface 301 is a second angle. For example, the angles between the reflection surface of each first transflective portion 330 and the light emitting surface 301 are all equal. For example, the light incident surface 302 is parallel to the light emitting surface 301, and an included angle between the light in-coupling reflection surface 310 and the light incident surface 302 is also a first included angle. For example, the difference between the first angle and the second angle ranges from 0 ° to 90 °. For example, the difference between the first angle and the second angle ranges from 10 ° to 60 °. For example, the difference between the first angle and the second angle ranges from 20 ° to 50 °.
The embodiment of the utility model provides a through the contained angle between regulation light incoupling plane of reflection and the printing opacity portion, can improve the visual field of the light of incidenting to the optical waveguide component and the visual field of the light of going out the plain noodles outgoing as far as possible.
For example, as shown in fig. 1, the light incoupling reflective surface 310 is disposed on the second surface 304 of the waveguide medium 320, and the included angle between the first surface 303 and the second surface 304 is greater than 90 °, and the incident angle of the light incident on the light incoupling reflective surface 310 is not greater than the critical angle for total reflection. For example, the included angle between the first surface 303 and the second surface 304 is 100 ° to 150 °. For example, the included angle between the first surface 303 and the second surface 304 is, for example, 120 ° to 140 °.
For example, as shown in fig. 1, the light incoupling reflective surface 310 may be plated or otherwise affixed to the second surface 304 of the waveguide medium 320. For example, the light incoupling reflective surface 310 may be attached to the second surface 304 of the waveguide medium 320 by using an optical adhesive, so that the processing requirement of the surface profile of the optical waveguide element may be reduced, and the production cost may be greatly reduced.
For example, as shown in fig. 1, the light incoupling reflective surface 310 is parallel to the second surface 304, and the angle between the first surface and the second surface is equal to the angle between the light incoupling reflective surface and the first surface.
The embodiment of the utility model provides a through adjusting the contained angle between first surface and the second surface, can improve the visual field of the light of incidenting to the optical waveguide component as far as possible.
For example, as shown in fig. 1, the light guide element 300 further includes a third surface 305 parallel to the first surface 303, the third surface 305 includes an incident surface 302, and the second surface 304 connects the third surface 305 and the first surface 303. For example, the third surface 305 may include an incident surface 302 and an emergent surface 301, and the emergent surface and the incident surface may be located on the same surface of the optical waveguide device.
Fig. 1 schematically shows that the second surface is an outer surface of the waveguide medium, and the light incoupling reflective surface is located at the outer surface of the waveguide medium. But not limited to this, another sub-waveguide medium may also be attached to the outside of the second surface, and then the light incoupling reflecting surface is located between the two sub-waveguide media, which may protect the light incoupling reflecting surface.
For example, the light incoupling reflective surface 310 comprises a reflective enhancement film. For example, the reflection increasing film may be a metal film or a dielectric coating film, such as an aluminum film. The embodiment of the utility model provides a can be through set up in the optical coupling reflection face and increase the reflectivity of anti-membrane in order to improve the optical coupling reflection face, and then reduce the loss of the light in the coupling waveguide medium.
For example, fig. 4 is a schematic view of a partial structure of an optical waveguide element according to an example of the present invention. As shown in fig. 4, the second surface 304 is an outer surface of the waveguide medium 320, and the light in-reflecting surface 310 is located on a side of the second surface 304 away from the first transflective portion 330. For example, a side of the light incoupling reflective surface 310 remote from the second surface 304 is provided with a protective layer 340 to protect the light incoupling reflective surface 310 from being oxidized due to direct contact with air.
For example, as shown in fig. 4, the material of the protective layer 340 may include aluminum oxide (Al)2O3) Silicon oxide (SiO)2) Or magnesium fluoride (MgF)2) And the like. The embodiment of the utility model provides a be not limited to this, can also be other materials that play the guard action.
For example, fig. 5 is a schematic partial cross-sectional structure diagram of a near-eye display device according to another example of the present invention. As shown in fig. 5, the optical waveguide element 300 further includes a plurality of second transflective portions 350 arranged along a second direction (i.e., a Z direction shown in the figure), the plurality of second transflective portions 350 are located at light incident sides of the plurality of first transflective portions 330, each second transflective portion 350 is not parallel to each first transflective portion 330, and the plurality of second transflective portions 350 are configured to reflect a part of the light rays propagating into the plurality of second transflective portions 350 toward the plurality of first transflective portions 330.
For example, fig. 5 schematically shows that the first direction and the second direction are perpendicular, but is not limited thereto, and the first direction and the second direction may intersect.
For example, as shown in fig. 5, each second transflective portion 350 may have the same characteristics as each first transflective portion 330, and thus, the description thereof is omitted. For example, the relative position relationship of the second transflective portions 350 may also be the same as the relative position relationship of the first transflective portions, and will not be described herein again.
For example, the number of second transflective portions 350 may be the same as or different from the number of first transflective portions 330.
For example, as shown in fig. 5, the optical waveguide element provided with the plurality of first transflective portions 330 and the optical waveguide element provided with the plurality of second transflective portions 350 may be an integrated structure, but not limited thereto, and the first transflective portions and the second transflective portions may be respectively provided in two optical waveguide elements separated from each other.
For example, image light emitted from the image source 100 enters the plurality of second transflective portions 350 after passing through the light-coupling reflective surface, the image light is transmitted and reflected by the plurality of second transflective portions 350 to realize expansion in one direction (for example, the second direction), and light reflected by the plurality of second transflective portions 350 to the plurality of first transflective portions 330 is transmitted and reflected by the plurality of first transflective portions 330 to realize expansion in another direction (for example, the first direction).
The near-eye display device provided by the example is provided with the two-dimensional array optical waveguide element, and image light emitted by an image source can be expanded in two directions, so that the field angle of the near-eye display device is expanded under the condition that the volume of the near-eye display device is not increased as much as possible.
For example, as shown in fig. 1, the image source 100 may be an image source in a micro-projector light machine, such as an organic light emitting diode display source. Embodiments of the present invention are not limited thereto, and the image source may also be any other suitable type of display source, for example, an LCD image display source, etc. For example, the image source 100 can include a monochromatic light source, which ultimately can form a monochromatic image, or a color-mixed light source, which can form a color image, such as a red monochromatic light source, a green monochromatic light source, a blue monochromatic light source, or a white color-mixed light source. For example, the image source 100 includes a light source that may be a laser light source or a Light Emitting Diode (LED) light source. For example, the image source 100 may include one light source or a plurality of light sources.
For example, as shown in fig. 1, the light ray adjustment element 200 may include a plurality of light ray adjustment structures 210 arranged in an array on a plane perpendicular to the X direction. For example, the image source 100 may include a plurality of sub-display regions 110 arranged in a planar array perpendicular to the X-direction. For example, the plurality of sub-display regions 110 and the plurality of light adjustment structures 210 are in one-to-one correspondence, that is, the image source 100 includes the same number of sub-display regions 110 as the number of light adjustment structures 210 included in the optical adjustment element 200, and one sub-display region 110 corresponds to one light adjustment structure 210. The image light emitted from each sub-display region 110 is configured to exit from the corresponding light ray adjustment structure 210 and enter the light guide element 300. For example, image light emitted from different sub-display regions 110 passes through different light ray adjustment structures 210 and is incident on the light guide element 300.
For example, the image source 100 includes a plurality of sub-display regions 110 that may be a plurality of different partial fields of view that divide the display region of the image source 100. Each sub-display area 110 forms a local field of view. For example, the different sub-display regions 110 are connected to each other to form a display region of the entire image source 100.
For example, the sub display region 110 may be a display unit capable of displaying different colors and brightness. For example, each display unit includes a plurality of sub-pixels of different colors, and by adjusting the light emission luminance of the sub-pixels of different colors, each display unit can be caused to display light of different colors and different luminances, so that the entire display area displays a color picture. For example, each display unit may include red, green, and blue sub-pixels, and light of different colors and different brightness may be displayed by mixing light emitted from the different color sub-pixels. Of course, each sub-display region may include only one sub-pixel, and each sub-display region may be regarded as a region where each sub-pixel is located.
For example, the light adjustment element may include a plurality of layers of light adjustment structures, each layer of light adjustment structure including a surface structure having an optical refraction function and at least one of a spherical surface, an aspherical surface, a free-form surface, and a flat surface.
For example, by adjusting parameters such as the curvature of the curved surface included in each light ray adjustment structure or the inclination angle of the plane included in each light ray adjustment structure, the propagation direction of the light rays passing through the light ray adjustment structure in the sub display region is changed to change the angle of view of the light incident surface of the optical waveguide element, thereby being beneficial to eliminating a series of problems such as distortion, vignetting, non-uniform field of view, non-uniform color and the like generated in the propagation process of the light rays emitted by the sub display region.
For example, the light incident on the optical waveguide element 300 is collimated light. For example, each light ray modification structure 210 may be a collimating optical channel configured to collimate image light incident to the light ray modification structure 210.
For example, the light ray adjustment element 200 further includes a collimating lens (not shown) disposed on a side of the plurality of light ray adjustment structures 210 facing the light waveguide element 300, and light rays emitted from the plurality of light ray adjustment structures 210 are incident on the light incident surface 302 of the light waveguide element 300 through the collimating lens. For example, a collimating lens is positioned between the light ray modification structure 210 and the light guide element 300.
For example, the image light emitted from each sub-display region 110 is configured to exit from the corresponding light ray adjustment structure 210 and enter the collimating lens, and the light ray exiting from the collimating lens enters the light waveguide element 300. For example, image light emitted from different sub-display regions 110 passes through different light-adjusting structures 210 and then enters the collimating lens.
For example, the collimating lens is configured to collimate light focused from each light ray modification structure 210 to the collimating lens. For example, the collimating lens may be a single lens or a lens group formed by a plurality of lenses, which is not particularly limited by the embodiment of the present invention.
For example, the plurality of light ray adjustment structures may be matched with the collimating lens, so that light beams emitted from different local view fields (i.e., different sub-display regions) on an image source are focused by the corresponding light ray adjustment structures to the optimal collimating and imaging position of the collimating lens relative to the light beam, and are collimated by the collimating lens, and then emitted from the collimating lens to the optical waveguide element to form a series of parallel lights in different directions.
The embodiment of the utility model provides a, through cooperating optical adjustment element and optical waveguide component, when distortion, vignetting, the visual field is inhomogeneous, the inhomogeneous scheduling problem of colour that light that the source of eliminating the image sent in the process of propagating produced as far as possible, can also increase the visual field of inciding to the optical waveguide component, and the increase is followed the visual field of optical waveguide component, provides the experience of preferred for the user.
For example, the near-eye display device may be a head-mounted display or other augmented reality or virtual reality display apparatus. The near-eye display device may comprise, for example, a mixed reality head-mounted display, such as microsoft's HoloLens.
For example, the near-eye display device may be AR glasses, the optical waveguide element may be mounted in the frame of the glasses (e.g., near the lens), and the image source and light adjustment structure may be mounted in the arm of the glasses adjacent to the edge of the optical waveguide element. For example, the drive electronics for the image source may be mounted on the arm, and power supplies and the like may be connected to the arm by wires.
Another embodiment of the present invention provides an optical waveguide element, including a light incoupling reflective surface, a waveguide medium, and a plurality of first transflective portions arranged along a first direction. One part of the light transmitted to each of the plurality of first transflective portions is reflected by the first transflective portion out of the light emitting surface of the optical waveguide element, and the other part of the light transmitted to each of the plurality of first transflective portions is transmitted through the first transflective portion and then is continuously transmitted in the optical waveguide element. An included angle between the light incoupling reflecting surface and the light incident surface of the optical waveguide element is greater than 0 degrees and less than 90 degrees, the light incoupling reflecting surface is configured to reflect light rays incident to the light incoupling reflecting surface through the light incident surface to a first surface of the waveguide medium, the first surface is opposite to the light incident surface, and an incident angle of the light rays incident to the first surface is not less than the total reflection critical angle thetac; the light incoupling reflecting surface is a mirror reflecting surface so that the range of the view field of the light incident to the light incident surface is +/-90-theta c. It should be noted that the description of the optical waveguide element in the near-eye display device is applicable to the optical waveguide element here, and the description of the structure and the technical effect thereof is not repeated.
The following points need to be explained:
(1) in the drawings of the embodiments of the present invention, only the structures related to the embodiments of the present invention are referred to, and other structures may refer to general designs.
(2) Features of the present invention may be combined with each other in the same embodiment and in different embodiments without conflict.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Claims (10)
1. An optical waveguide component, comprising:
the light guide element comprises a light in-coupling reflection surface, a waveguide medium and a plurality of first transflective portions arranged along a first direction, wherein one part of light transmitted to each first transflective portion in the plurality of first transflective portions is reflected out of the light emitting surface of the light guide element by the first transflective portion, and the other part of light transmitted to each first transflective portion is transmitted through the first transflective portion and then is continuously transmitted in the light guide element,
the included angle between the light in-coupling reflection surface and the light incident surface of the optical waveguide element is greater than 0 degree and less than 90 degrees, the light in-coupling reflection surface is configured to reflect light rays incident to the light in-coupling reflection surface through the light incident surface to a first surface of the waveguide medium, the first surface is opposite to the light incident surface, and the incident angle of the light rays incident to the first surface is not less than a total reflection critical angle thetac;
the light incoupling reflecting surface is a mirror reflecting surface so that the range of the view field of the light incident to the light incident surface is +/-90-theta c.
2. The optical waveguide element according to claim 1, wherein an angle between the reflection surface of at least one of the first transflective portions and the light exit surface is greater than 0 ° and less than 90 °.
3. The optical waveguide element according to claim 1, further comprising a plurality of second transflective portions arranged in a second direction, the plurality of second transflective portions being located on a light incident side of the plurality of first transflective portions, each of the second transflective portions being non-parallel to each of the first transflective portions, the plurality of second transflective portions being configured to reflect a part of the light propagating into each of the second transflective portions toward the plurality of first transflective portions, the first direction and the second direction intersecting.
4. The optical waveguide element according to claim 1, wherein the light incoupling reflective surface is disposed on the second surface of the waveguide medium, and the included angle between the first surface and the second surface is greater than 90 °, and the incident angle of the light incident on the light incoupling reflective surface is not greater than the critical angle for total reflection.
5. The optical waveguide element of claim 4, wherein the waveguide medium further comprises a third surface opposite the first surface and parallel to each other, the third surface comprising the input surface, and the second surface connecting the third surface and the first surface.
6. The optical waveguide element of claim 4, wherein the light incoupling reflective surface comprises a reflective enhancement film.
7. An optical waveguide element as claimed in claim 6, wherein the second surface is an outer surface of the waveguide medium, and a side of the light incoupling reflective surface remote from the second surface is provided with a protective layer.
8. A near-eye display device comprising the light guide element of any of claims 1-7, the near-eye display device further comprising:
an image source; and
the light adjusting element is positioned at the light emitting side of the image source and is configured to adjust the direction of image light emitted by the image source;
the light guide element is positioned on the light emitting side of the light ray adjusting element, and the light rays emitted from the light ray adjusting element are configured to enter the light guide element and exit from the light emitting surface of the light guide element after being reflected for multiple times in the light guide element.
9. The near-eye display device of claim 8 wherein the image source comprises a plurality of sub-display regions, the light adjustment element comprises a plurality of light adjustment structures, the plurality of sub-display regions and the plurality of light adjustment structures are in one-to-one correspondence, and image light emitted by each sub-display region is configured to exit the corresponding light adjustment structure.
10. A near-eye display device as claimed in claim 8 or 9 wherein the light ray modification element further comprises:
a coupling lens located on a side of the plurality of light ray modification structures facing the optical waveguide element,
the light rays emitted from the plurality of light ray adjusting structures are incident to the light incident surface of the optical waveguide element through the coupling lens.
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| CN202120617643.6U CN214409452U (en) | 2021-03-26 | 2021-03-26 | Optical waveguide element and near-to-eye display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023133733A1 (en) * | 2022-01-12 | 2023-07-20 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023133733A1 (en) * | 2022-01-12 | 2023-07-20 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Display device |
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