CN216210018U - Optical element and near-to-eye display system - Google Patents
Optical element and near-to-eye display system Download PDFInfo
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- CN216210018U CN216210018U CN202122680954.XU CN202122680954U CN216210018U CN 216210018 U CN216210018 U CN 216210018U CN 202122680954 U CN202122680954 U CN 202122680954U CN 216210018 U CN216210018 U CN 216210018U
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Abstract
The utility model discloses an optical element and a near-eye display system, and relates to the technical field of display. The optical element provided by the utility model can improve the brightness and uniformity of light emission, enlarge the field range and has higher wearability.
Description
Technical Field
The utility model relates to the technical field of display, in particular to an optical element and a near-to-eye display system.
Background
In the augmented reality technology, the near-eye display system comprises a transparent optical waveguide arranged in front of eyes of a user, light is transmitted in the optical waveguide through internal reflection, then an image is coupled to the eyes of the user through a proper output mechanism, virtual images are superposed on a real scene, and immersive and interactive experiences are provided for the user, so that the augmented reality technology has important significance in the fields of entertainment, industry, medicine and the like.
The existing method for expanding light rays in two dimensions of the optical waveguide is realized in a parallel array mode, in the technology of parallel array partial reflecting surfaces, under the condition that the light rays are totally reflected in the optical waveguide at different angles, the light rays totally reflected at certain angles and the partial reflecting surfaces do not reflect, so that emergent light rays are lost, the uniformity of emergent light of the optical waveguide is poor, and the field angle is not easy to expand.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an optical element and a near-eye display system, which improve the uniformity of light output and enlarge the angle of view.
The embodiment of the utility model is realized by the following steps:
an optical element comprises a plurality of first partial reflecting surfaces and a plurality of second partial reflecting surfaces, wherein the first partial reflecting surfaces and the second partial reflecting surfaces are arranged between a first main outer surface and a second main outer surface which are parallel to each other, a first area and a second area which are connected with each other are divided between the first main outer surface and the second main outer surface along a first direction, the first partial reflecting surfaces are symmetrically distributed in the first area along a second direction which is perpendicular to the first direction, planes where two adjacent first partial reflecting surfaces are located can intersect, the second partial reflecting surfaces are distributed in parallel in the second area along the first direction, the first partial reflecting surfaces are used for reflecting coupled-in light to the second partial reflecting surfaces, and the second partial reflecting surfaces are used for enabling the coupled-in light to be emitted out in parallel from the first main outer surface.
Alternatively, as a practical way, the adjacent edges of two adjacent first partial reflecting surfaces are connected with each other.
Alternatively, as a practical way, the adjacent edges of two adjacent first partial reflecting surfaces are separated from each other.
Alternatively, as an implementable manner, the linear polarizing film is provided on the first partially reflecting surface, and the polarization directions of the plurality of first partially reflecting surfaces are vertically alternated with each other.
Alternatively, as an implementable manner, the reflectivities of the plurality of first partial reflection surfaces distributed along the second direction are sequentially increased, and the reflectivities of the plurality of second partial reflection surfaces distributed along the first direction are sequentially increased.
Optionally, as an implementable manner, an included angle α between two adjacent first partial reflecting surfaces satisfies 70 ° α or more and 160 ° or less.
Optionally, as an implementable manner, an included angle α between an intersection line between the first partially reflective surface and the first main outer surface and the incident light line1Alpha is more than or equal to 25 degrees1≤75°。
Optionally, as a practical way, the included angle β between the second partial reflecting surface and the first main outer surface satisfies 20 ° β ≦ 45 °.
Optionally, as an implementable manner, an angle β between an intersection line between the first partially reflective surface and the first main outer surface and an intersection line between the second partially reflective surface and the first main outer surface1Beta is more than or equal to 20 degrees1≤65°。
A near-eye display system comprising an optical element as claimed in any one of the above.
The embodiment of the utility model has the beneficial effects that:
the utility model provides an optical element which comprises a plurality of first partial reflecting surfaces and a plurality of second partial reflecting surfaces, wherein the first partial reflecting surfaces and the second partial reflecting surfaces are arranged between a first main outer surface and a second main outer surface which are parallel to each other, a first area and a second area which are connected with each other are divided between the first main outer surface and the second main outer surface along a first direction, the first partial reflecting surfaces are symmetrically distributed in the first area along a second direction which is vertical to the first direction, planes where two adjacent first partial reflecting surfaces are located can intersect, the second partial reflecting surfaces are distributed in parallel in the second area along the first direction, the first partial reflecting surfaces are used for reflecting coupled-in light to the second partial reflecting surfaces, and the second partial reflecting surfaces are used for enabling the coupled-in light to be emitted out from the first main outer surface in parallel. The optical element is provided with first partial reflection surfaces which are symmetrical and nonparallel to each other in a first region, and second partial reflection surfaces which are parallel to each other in a second region. After the coupled light enters the optical element, total reflection occurs between the first main outer surface and the second main outer surface, and the coupled light can be partially reflected on the first partial reflection surfaces which are symmetrical with each other in sequence as first dimension expansion between each total reflection. After the coupled light to be reflected is conducted to the second area, the coupled light is continuously conducted in the second partial reflecting surfaces which are parallel to each other in the second area in sequence to generate partial reflection, the partial reflection is used as second dimension expansion, and finally the coupled light is reflected to the eyes of a user. Therefore, the optical element can improve the brightness and uniformity of emergent light, enlarge the field range of a user, is light and thin in structure, facilitates system integration, and has high wearability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of an optical element according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first partially reflective surface of an optical element according to an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of a first partial reflection surface of an optical element according to an embodiment of the present invention;
fig. 4 is a third schematic structural diagram of a first partial reflection surface in an optical element according to an embodiment of the present invention;
FIG. 5 is a second schematic structural diagram of an optical device according to an embodiment of the present invention;
fig. 6 is a third schematic structural diagram of an optical element according to an embodiment of the present invention.
Icon: 100-an optical element; 110-a first major outer surface; 120-a second major outer surface; 130-a reflective area; 131-a first region; 132-a second region; 140-a first partially reflective surface; 141-the edge of the first partially reflective surface; 150-a second partially reflective surface; 200-coupling in light.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally placed when the products of the present invention are used, and are only used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present embodiment provides an optical element 100, which includes a plurality of first partial reflection surfaces 140 and a plurality of second partial reflection surfaces 150 disposed between a first main outer surface 110 and a second main outer surface 120 that are parallel to each other, a first region 131 and a second region 132 that are connected to each other are divided between the first main outer surface 110 and the second main outer surface 120 along a first direction, the plurality of first partial reflection surfaces 140 are symmetrically distributed in the first region 131 along a second direction perpendicular to the first direction, planes where two adjacent first partial reflection surfaces 140 are located can intersect, the plurality of second partial reflection surfaces 150 are distributed in the second region 132 along the first direction in parallel, the first partial reflection surfaces 140 are configured to reflect an incident light 200 to the second partial reflection surfaces 150, and the second partial reflection surfaces 150 are configured to enable the incident light 200 to exit from the first main outer surface 110 in parallel.
The optical element 100 comprises a plurality of first partially reflective surfaces 140 and a plurality of second partially reflective surfaces 150 between a first main outer surface 110 and a second main outer surface 120 that are parallel to each other. The first main outer surface 110 and the second main outer surface 120 form a reflective area 130 therebetween, and the reflective area 130 extends in a first direction (direction a in fig. 1) and a second direction (direction B in fig. 1), respectively, wherein the first direction and the second direction are perpendicular to each other. The reflection region 130 is divided into a first region 131 and a second region 132 which are connected with each other along a first direction, a plurality of first partial reflection surfaces 140 are symmetrically distributed in the first region 131 along a second direction, the plurality of first partial reflection surfaces 140 respectively intersect with the first main outer surface 110 and the second main outer surface 120, a plane where two adjacent first partial reflection surfaces 140 are located has an intersection line (i.e. two adjacent first partial reflection surfaces 140 are not parallel to each other), and two adjacent first partial reflection surfaces 140 are symmetrical with respect to a plane which passes through the intersection line and is perpendicular to the first main outer surface 110. The plurality of second partially reflective surfaces 150 are distributed in parallel along the first direction in the second region 132, and the plurality of second partially reflective surfaces 150 intersect the first main outer surface 110 and the second main outer surface 120, respectively.
The first partially reflective surface 140 is located on the first propagation path of the coupled-in light ray 200 and serves as an extension structure for the coupled-in light ray 200 in the first dimension. The coupled-in light 200, after entering the first region 131, is totally reflected between the parallel first and second major outer surfaces 110 and 120, while being partially reflected at the first partially reflective surfaces 140 that are symmetrical to each other in the first region 131. The second partially reflective surface 150 is located on the second propagation path of the coupled-in light ray 200 and serves as an extension structure for the coupled-in light ray 200 in the second dimension. After the reflected incoupling light 200 is transmitted to the second region 132, it is transmitted in the parallel partial reflection planes to continue partial reflection, and finally exits in parallel from the first main outer surface 110, and the parallel exiting incoupling light 200 will be received by the eyes of the user.
As described above, the optical element 100 includes a plurality of first partial reflection surfaces 140 and a plurality of second partial reflection surfaces 150 disposed between the first main outer surface 110 and the second main outer surface 120 that are parallel to each other, a first region 131 and a second region 132 that are connected to each other are divided between the first main outer surface 110 and the second main outer surface 120 along a first direction, the plurality of first partial reflection surfaces 140 are symmetrically distributed in the first region 131 along a second direction perpendicular to the first direction, and planes in which two adjacent first partial reflection surfaces 140 are located can intersect, the plurality of second partial reflection surfaces 150 are distributed in parallel in the second region 132 along the first direction, the first partial reflection surfaces 140 are configured to reflect the coupled light 200 to the second partial reflection surfaces 150, and the second partial reflection surfaces 150 are configured to allow the coupled light 200 to exit from the first main outer surface 110 in parallel. In the optical element 100, first partial reflection surfaces 140 that are symmetrical and non-parallel to each other are provided in the first region 131, and second partial reflection surfaces 150 that are parallel to each other are provided in the second region 132. After the incoupled light 200 enters the optical element 100, total reflection occurs between the first main outer surface 110 and the second main outer surface 120, and between each total reflection, the incoupled light 200 is partially reflected on the first partially reflective surfaces 140 which are symmetrical to each other in sequence as a first dimension expansion. After the coupled-in light 200 to be reflected is transmitted to the second region 132, it is continuously transmitted and partially reflected in the second partially reflective surfaces 150 parallel to each other in the second region 132, and is used as a second dimension expansion, and finally the coupled-in light 200 is reflected to the eyes of the user. Therefore, the optical element 100 can increase the brightness and uniformity of the emitted light, and also enlarge the field of view of the user, and has a light and thin structure, which is beneficial to system integration and higher wearability.
Optionally, in an achievable manner of the embodiment of the present invention, each of the first partial reflecting surface 140 and the second partial reflecting surface 150 includes at least four.
The number of the first partial reflecting surfaces 140 and the number of the second partial reflecting surfaces 150 are both more than or equal to four, so that the brightness and uniformity of the light can be better improved, and the field range of a user can be enlarged.
Referring to fig. 1, in an alternative implementation manner of the embodiment of the present invention, the plurality of first partial reflecting surfaces 140 and the plurality of second partial reflecting surfaces 150 are not overlapped with each other.
The first partial reflecting surfaces 140 and the second partial reflecting surfaces 150 are not overlapped with each other, so as to ensure that the coupled-in light 200 smoothly enters the second region 132 from the first region 131 and is emitted in parallel from the first main outer surface 110, reduce the loss of the coupled-in light 200, and improve the light-emitting brightness.
Referring to fig. 2, alternatively, in an implementation manner of the embodiment of the present invention, adjacent edges of two adjacent first partial reflecting surfaces 140 are connected to each other.
The plurality of first partial reflecting surfaces 140 are sequentially distributed in the first region 131 along the second direction, an intersection line of the first partial reflecting surface 140 and the first main outer surface 110 and the second main outer surface 120 is an edge 141 of the first partial reflecting surface, each first partial reflecting surface 140 includes two edges in the second direction, adjacent edges of two adjacent first partial reflecting surfaces 140 are connected with each other, and the plurality of first partial reflecting surfaces 140 are connected with each other into a whole.
Referring to fig. 1 and 3, alternatively, in an implementation manner of the embodiment of the present invention, adjacent edges of two adjacent first partial reflecting surfaces 140 are separated from each other.
The plurality of first partial reflecting surfaces 140 are sequentially distributed in the first region 131 along the second direction, an intersection line of the first partial reflecting surface 140 and the first main outer surface 110 and the second main outer surface 120 is an edge 141 of the first partial reflecting surface, each first partial reflecting surface 140 includes two edges in the second direction, and adjacent edges of two adjacent first partial reflecting surfaces 140 are separated from each other, so that the coupled-in light rays 200 at more angles are effectively reflected.
Referring to fig. 1 and 4, in an alternative implementation manner of the embodiment of the present invention, a linear polarization film is disposed on the first partial reflection surface 140, and polarization directions of the plurality of first partial reflection surfaces 140 are perpendicular and alternate with each other.
The first partial reflecting surfaces 140 are formed by a mixed surface system, and the linear polarizing film is disposed on the first partial reflecting surfaces 140, so that each first partial reflecting surface 140 can reflect polarized light in only one direction, and the polarization directions of the plurality of first partial reflecting surfaces 140 are perpendicular and alternate with each other, that is, the plurality of first partial reflecting surfaces 140 sequentially reflect S-P-S-polarized light along the second direction, and so on, or the plurality of first partial reflecting surfaces 140 sequentially reflect P-S-P-polarized light along the second direction, and so on. For convenience of description, the first partial reflection surface 140 indicated by a solid line in fig. 4 reflects polarized light in one direction, and the first partial reflection surface 140 indicated by a dotted line reflects polarized light in another direction. If the first partially reflective surface 140 indicated by the solid line reflects S-polarized light, the first partially reflective surface 140 indicated by the dotted line reflects P-polarized light; when the first partial reflecting surface 140 indicated by a solid line reflects P-polarized light, the first partial reflecting surface 140 indicated by a broken line reflects S-polarized light. The first partial reflecting surface 140 formed by the mixed surface system can improve the uniformity and energy transmittance of the light.
Alternatively, in an achievable manner of the embodiment of the present invention, the reflectances of the plurality of first partial reflecting surfaces 140 distributed along the second direction are sequentially increased, and the reflectances of the plurality of second partial reflecting surfaces 150 distributed along the first direction are sequentially increased.
On the propagation path of the coupled-in light 200, the reflectances of the plurality of first partial reflecting surfaces 140 distributed along the second direction are sequentially increased, and the reflectances of the plurality of second partial reflecting surfaces 150 distributed along the first direction are sequentially increased, so that the light loss is effectively reduced, and the uniformity of the emitted light is improved. Preferably, the reflectivity of the last first partially reflective surface 140 and the last second partially reflective surface 150 is greater than 90% on the propagation path of the coupled-in light ray 200.
Alternatively, in an achievable manner of the embodiment of the present invention, the included angle α between two adjacent first partial reflecting surfaces 140 satisfies 70 ° α or more and 160 ° or less.
When the included angle α between two adjacent first partial reflecting surfaces 140 is greater than or equal to 70 ° and less than or equal to 160 °, it can be ensured that the coupled-in light 200 smoothly enters the second region 132, and the incident light emitted from the first region 131 is more uniform, thereby reducing the occurrence of stripes. Specifically, the included angle α between two adjacent first partial reflecting surfaces 140 can be calculated according to the included angle between the coupled-in light ray 200 and the first main outer surface 110 (or the second main outer surface 120).
Referring to fig. 1 and 5, alternatively, in an implementation manner of the embodiment of the utility model, an included angle α between an intersection line between the first partially reflective surface 140 and the first main outer surface 110 and the incident light 2001Alpha is more than or equal to 25 degrees1≤75°。
When the intersection line between the first partially reflective surface 140 and the first main outer surface 110 forms an included angle α with the incident light 2001Alpha is more than or equal to 25 degrees1When the angle is less than or equal to 75 degrees, more coupled-in light rays 200 can be reflected into the second area 132, the brightness of the coupled-in light rays emitted from the first area 131 is improved, the emergent light rays are more uniform, and the generation of stripes is reduced.
Referring to FIGS. 1 and 6, alternatively, in an achievable manner of an embodiment of the utility model, the angle β between the second partially reflective surface 150 and the first major outer surface 110 satisfies 20 ≦ β ≦ 45.
When the included angle β between the second partial reflecting surface 150 and the first main outer surface 110 is not less than 20 ° and not more than 45 °, the coupled-in light 200 can be ensured to exit from the first main outer surface 110 in parallel, and the angle of field can be enlarged.
Referring to fig. 1 and 5, alternatively, in an implementation manner of the embodiment of the present invention, an included angle β between an intersection line between the first partially reflective surface 140 and the first main outer surface 110 and an intersection line between the second partially reflective surface 150 and the first main outer surface 1101Beta is more than or equal to 20 degrees1≤65°。
When the angle β between the intersection between the first partially reflective surface 140 and the first main outer surface 110 and the intersection between the second partially reflective surface 150 and the first main outer surface 1101Beta is more than or equal to 20 degrees1And when the angle is less than or equal to 65 degrees, more coupled-in light rays 200 can be emitted from the first main outer surface 110, and the field angle is enlarged.
Alternatively, in an achievable manner of an embodiment of the utility model, the user angle of view θ satisfies-40 ≦ θ ≦ 40.
When the field angle theta of the user is larger than or equal to minus 40 degrees and smaller than or equal to 40 degrees, the user can receive a clear and complete image in a larger field range, and the wearable performance of the optical element 100 is improved.
The embodiment of the utility model also discloses a near-eye display system which comprises the optical element 100.
The near-eye display system includes the same structure and advantageous effects as the optical element 100 in the foregoing embodiment. The structure and advantages of the optical element 100 have been described in detail in the foregoing embodiments, and are not repeated herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical element comprising a plurality of first partially reflecting surfaces and a plurality of second partially reflecting surfaces arranged between a first main outer surface and a second main outer surface which are parallel to each other, a first area and a second area which are connected with each other are divided between the first main outer surface and the second main outer surface along a first direction, a plurality of first partial reflecting surfaces are symmetrically distributed in the first area along a second direction which is perpendicular to the first direction, planes of two adjacent first partial reflecting surfaces can intersect, and a plurality of second partial reflecting surfaces are distributed in parallel in the second area along the first direction, the first partial reflecting surface is used for reflecting the coupled light to the second partial reflecting surface, and the second partial reflecting surface is used for enabling the coupled light to be emitted in parallel from the first main outer surface.
2. An optical element according to claim 1, wherein adjacent edges of adjacent two of said first partially reflecting surfaces are connected to each other.
3. An optical element according to claim 1, wherein adjacent edges of adjacent two of the first partially reflective surfaces are separated from each other.
4. An optical element according to claim 1, wherein the first partially reflecting surface is provided with a linear polarizing film, and the polarization directions of the plurality of first partially reflecting surfaces are vertically alternated with each other.
5. The optical element according to claim 1, wherein the reflectance of the plurality of first partially reflective surfaces distributed in the second direction increases in sequence, and the reflectance of the plurality of second partially reflective surfaces distributed in the first direction increases in sequence.
6. An optical element as recited in any one of claims 1 to 5, wherein an angle α between adjacent two of said first partially reflecting surfaces satisfies 70 ° α 160 °.
7. An optical element according to any one of claims 1 to 5, wherein an intersection between the first partially reflecting surface and the first main outer surface forms an angle α with the incoming light ray1Alpha is more than or equal to 25 degrees1≤75°。
8. An optical element as recited in any one of claims 1 to 5, wherein an angle β between said second partially reflective surface and said first major outer surface satisfies 20 ° ≦ β ≦ 45 °.
9. An optical element as recited in any one of claims 1 to 5, wherein an intersection between said first partially reflective surface and said first major outer surface and said second major outer surfaceAn angle beta between the intersection between the partially reflecting surface and the first major outer surface1Beta is more than or equal to 20 degrees1≤65°。
10. A near-eye display system comprising the optical element of any one of claims 1 to 9.
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| CN202122680954.XU CN216210018U (en) | 2021-11-04 | 2021-11-04 | Optical element and near-to-eye display system |
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| CN202122680954.XU CN216210018U (en) | 2021-11-04 | 2021-11-04 | Optical element and near-to-eye display system |
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