CN212623170U - Compact optical module and near-to-eye display device - Google Patents
Compact optical module and near-to-eye display device Download PDFInfo
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- CN212623170U CN212623170U CN202020829201.3U CN202020829201U CN212623170U CN 212623170 U CN212623170 U CN 212623170U CN 202020829201 U CN202020829201 U CN 202020829201U CN 212623170 U CN212623170 U CN 212623170U
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Abstract
The utility model discloses a compact optical module and near-to-eye display device, compact optical module include first light processing layer, second light processing layer, third light processing layer, transflective optical element, first light processing layer, second light processing layer, transflective optical element and third light processing layer place the setting in proper order; through ingenious integration and the design to first light processing layer, second light processing layer, transflective optical element and third light processing layer for the light beam is folding at the inside secondary reflection of compact optical module, thereby has shortened compact optical module's module length, and the structure is compacter, the volume is littleer, and weight is also lighter.
Description
Technical Field
The utility model relates to an optical display technical field particularly, relates to a compact optical module and near-to-eye display device.
Background
In the virtual reality field, the optical module of VR glasses (also known as virtual reality glasses or virtual reality device) adopts traditional eyepiece optical system, has great thickness, and the total length of optical module is not less than the focus of module usually for the overall size of VR glasses is big, the weight is heavy, consequently is difficult to realize the frivolousization of VR glasses product.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a low-weight and compact optical module and a near-to-eye display device.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a compact optical module, which comprises a first optical processing layer, a second optical processing layer, a third optical processing layer and a transflective optical element, wherein the first optical processing layer, the second optical processing layer, the transflective optical element and the third optical processing layer are arranged in sequence;
the first light processing layer has a function of converting incident light into linearly polarized light and at least comprises a polarization transflective element, wherein the polarization transflective element transmits polarized light with the polarization direction consistent with the transmission axis direction of the polarization transflective element and reflects the polarized light with the polarization direction consistent with the vertical direction of the transmission axis of the polarization transflective element; the second light processing layer comprises a first phase modulation element which has the function of changing the phase of incident light, wherein the phase of the incident light is changed by beta degrees, and the phase of the incident light is changed by (a 180+80) to beta to (a 180+ 100); an included angle between the transmission axis direction of the polarization transflective element and the fast axis direction of the second light processing layer is 45 degrees;
the third light processing layer has the function of converting incident light into linearly polarized light and has selectivity on the direction of the polarized light, and comprises a second phase modulation element and a first absorption type polarization element, wherein the included angle between the fast axis direction of the second phase modulation element and the transmission axis direction of the first absorption type polarization element is 45 degrees, the phase change amount of the second phase modulation element on the incident light is gama degrees, and the gama is more than or equal to (a 180+80) and less than or equal to (a 180+ 100);
at least one surface of the transflective optical element is a curved surface and is provided with a transflective film layer.
Optionally, the phase change amount beta of the incident light by the second light processing layer is (a × 180+90) degrees, where a is an integer.
Optionally, the third light processing layer comprises a second phase modulation element having a phase change amount gama of (a x 180+90) degrees with respect to the incident light and a first absorption polarization element having a transmission axis making an angle of 45 degrees with a fast axis of the second phase modulation element.
Optionally, the first light processing layer further includes a third phase modulation element, and an included angle between a fast axis direction of the third phase modulation element and a transmission axis of the polarization transflective element is 45 degrees.
Optionally, the first light processing layer further includes a second absorption polarization element, the second absorption polarization element is disposed on a side of the polarization transflective element away from the second light processing layer, and a transmission axis direction of the second absorption polarization element is consistent with a transmission axis direction of the polarization transflective element.
Optionally, an optical path adjusting mechanism is further included.
Optionally, the second light processing layer, the transflective optical element, and the third light processing layer are disposed on the optical path adjusting mechanism.
Optionally, the first light processing layer is disposed on the optical path adjusting mechanism.
Optionally, an optical path adjusting mechanism is further included.
The utility model also provides a near-to-eye display device, including foretell compact optical module and image display device.
The compact optical module provided by the preferred embodiment of the present invention, through the smart integration and design of the first optical processing layer, the second optical processing layer, the transflective optical element and the third optical processing layer, the light beam is reflected and folded for the second time inside the compact optical module, thereby shortening the module length of the compact optical module, and having more compact structure, smaller volume and lighter weight; and the imaging distance of the image display device arranged at the AB position after passing through the compact optical module is adjustable by arranging the optical path adjusting mechanism, so that a user with myopia or hyperopia can clearly view information on the image display device arranged at the focal plane position of the compact optical module without wearing myopia or hyperopia correcting glasses.
The utility model provides a near-to-eye display device includes above-mentioned compact optical module 100 and image display device, therefore has similar beneficial effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is understood that the following drawings depict only some embodiments of the invention and are therefore not to be considered limiting of its scope, for the person skilled in the art will be able to derive from them other related drawings without inventive faculty.
Fig. 1 is a schematic view of a compact optical module according to a preferred embodiment of the present invention.
Fig. 2 is a schematic view of another compact optical module according to a preferred embodiment of the present invention.
Fig. 3 is a schematic view of another compact optical module according to a preferred embodiment of the present invention.
Fig. 4 is a schematic view of another compact optical module according to a preferred embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a first light processing layer according to a preferred embodiment of the present invention.
Fig. 6 is a schematic view of another compact optical module according to a preferred embodiment of the present invention.
Icon: 100-compact optical module; 10-a first light management layer; 11-a polarizing transflector; 13-a third phase modulating element 13; 20-a second light management layer; 30-a third light management layer; 31-a second phase modulation element; 32-a first absorbing polarizer element; a 40-transflective optical element; 90-optical path adjusting mechanism.
Detailed Description
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to 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, the terms "first", "second", "third", "fourth", etc. are used only for distinguishing the description, and are not to be construed as limiting or implying only relative importance.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a compact optical module 100 according to an embodiment of the present invention, in which the compact optical module 100 includes a first optical processing layer 10, a second optical processing layer 20, a third optical processing layer 30, and a transflective optical element 40; the first light processing layer 10, the second light processing layer 20, the transflective optical element 40 and the third light processing layer 30 are sequentially disposed.
For convenience of explanation, the rectangular coordinate system xyz shown in fig. 1 is established, and the first light processing layer 10 has a function of converting incident light into linearly polarized light. In the embodiment shown in fig. 1, the first light treatment layer 10 includes a polarization transflective element 11, the polarization transflective element 11 transmits light having a first linear polarization direction coinciding with the direction of its transmission axis k1 and reflects light having a second linear polarization direction perpendicular to the direction of the transmission axis k1, and the angle between the direction of the transmission axis k1 of the polarization transflective element and the OX axis direction is set to 45 degrees in this embodiment. In the xyz coordinate system, when a second direction is obtained by counterclockwise rotation of a first direction by an angle, the value of the rotation angle from the first direction to the second direction is defined as positive, whereas when the second direction is obtained by clockwise rotation, the value of the rotation angle from the first direction to the second direction is defined as negative, and thereby, the OX axis direction to the transmission axis k1 direction of the polarization transflective element 11 in fig. 1 is defined as positive 45 degrees, and the light beam transmitted through the polarization transflective element 11 is linearly polarized light having the polarization direction coincident with the transmission axis k 1. In the figure, the first linear polarization direction is represented by p, the second linear polarization direction is represented by s, and the first linear polarization direction and the second linear polarization direction are perpendicular to each other.
The second photo processed layer 20 is a first phase modulation element having a function of changing the phase of the incident light, and the second photo processed layer 20 changes the phase of the incident light in a range of beta degrees, where (a × 180+80) ≦ beta ≦ 180+100, where a is an integer. Preferably, the second light processing layer 20 has a function of completely converting linearly polarized light into circularly polarized light or completely converting circularly polarized light into linearly polarized light when the phase of the incident light is changed to (a × 180+90) degrees. The fast axis direction of the second light management layer 20 is denoted by fast and the slow axis direction is denoted by slow, and the angle between the direction of the transmission axis k1 of the polarization transflector 11 and the fast axis direction of the second light management layer 20 is 45 degrees. In the embodiment shown in fig. 1 and 2, the angle from the fast axis direction of the second light treatment layer 20 to the direction of the transmission axis k1 of the polarization transflective element 11 is positive 45 degrees, and in the embodiment shown in fig. 3 and 4, the angle from the fast axis direction of the second light treatment layer 20 to the direction of the transmission axis k1 of the polarization transflective element 11 is negative 45 degrees.
The third light processing layer 30 has a function of converting incident light into linearly polarized light and having selectivity to the direction of the polarized light, and includes a second phase modulation element 31 and a first absorption type polarization element 32 in this order along the positive direction of the OZ axis, the change amount of the phase of the incident light by the second phase modulation element 31 is gama degree, wherein (a 180+80) is ≦ gama ≦ 180+ 100; preferably, the second phase modulation element 31 has a function of converting linearly polarized light into circularly polarized light completely or converting circularly polarized light into linearly polarized light completely when the phase of the incident light is changed to (a × 180+90) degrees. The first absorption-type polarizer 32 transmits linearly polarized light having a polarization direction in accordance with the direction of the transmission axis k2 of the first absorption-type polarizer 32 and absorbs linearly polarized light having a polarization direction perpendicular to the direction of the transmission axis k 2; the angle between the fast axis direction of the second phase modulating element 31 and the direction of the transmission axis k2 of the first absorbing polarizing element 32 is 45 degrees. In the embodiment shown in fig. 1 and 2, the fast axis direction of the second phase modulation element 31 is rotated by a positive 45 degrees to the direction of the transmission axis k2 of the first absorption-type polarization element 32. In the embodiment shown in fig. 3 and 4, the angle of the fast axis direction of the second phase modulation element 31 in the direction rotated to the transmission axis k2 of the first absorption-type polarizing element 32 is minus 45 degrees.
With continued reference to fig. 1, at least one optical surface of the transflective optical element 40 is curved and is provided with a permeable, reflective film layer, the transflective optical element 40 may be a plano-convex lens, and the transflective optical element 40 is provided with a permeable, reflective film on the convex surface S42. As shown in FIG. 2, the transflective optical element 40 may also be a plano-concave lens with a transflective film disposed on the concave surface S41. As shown in fig. 3, the transflective optical element 40 may also be a meniscus lens, and the concave surface S41 may be provided with a transparent and reflective film, or the concave surface S41 may be provided with an anti-reflective film, and the convex surface S42 may be provided with a transparent and reflective film. As shown in fig. 4, the transflective optical element 40 may also be a lenticular lens, with an antireflection film on convex surface S41 and a permeable and reflective film on convex surface S42.
The following description of the optical path of the optical system is based on an embodiment shown in fig. 1:
optical path 1 (solid line in the figure): linearly polarized light (p in the figure) emitted by the first light processing layer 10 is converted into left circularly polarized light or left near circularly polarized light (LC in the figure) after passing through the second light processing layer 20, the transflective element 40 partially reflects and partially transmits the LC polarized light incident thereon, wherein the reflected LC polarized light is converted into linearly polarized light (s in the figure) with the polarization direction being consistent with the vertical direction of the transmission axis k1 of the polarization transflective element 11 after passing through the second light processing layer 10 again, the s-polarized light is reflected by the polarization transflective element 11 and then passes through the second light processing layer 20 again to be converted into right-handed circularly polarized light or right-handed nearly circularly polarized light (RC in the figure), the RC polarized light portion is transmitted through the transflective optical element 40, then converted into s-linearly polarized light after passing through the second phase modulation element 31, and transmitted through the first absorption-type polarizing element 32.
The light beam in the optical path 1 is reflected once at the transflective optical element 40 and once at the polarization transflective element 11, and the optical path is folded by two reflections, so that the distance from the polarization transflective element 11 to the third optical processing layer 30 is shortened, and the optical module 100 is shorter and more compact.
Optical path 2 (indicated by a broken line in the figure): linearly polarized light (p in the figure) emitted by the first light processing layer 10 is converted into left circularly polarized light or left near circularly polarized light (LC in the figure) after passing through the second light processing layer 20, the transflective element 40 partially reflects and partially transmits the LC polarized light incident thereon, wherein the transmitted LC polarized light is converted into p polarized light after passing through the second phase modulation element 31, and the p polarized light is absorbed by the first absorption type polarizer 32, so that interference on the light beam finally emitted by the light path 1 is avoided.
The optical path principle of the optical system shown in fig. 2 to 4 is similar to that of the optical system shown in fig. 1, and is not described herein for brevity.
The first light processing layer 20 further includes a second absorption-type polarization element 12, as shown in fig. 3, the second absorption-type polarization element 12 is disposed on a side of the polarization transflective element 11 away from the second light processing layer 20, and a transmission axis of the second absorption-type polarization element 12 is identical to a transmission axis of the polarization transflective element 11. Part of the LC light beam passing through the polarization transflective element 11, the second light processing layer 20, the transflective optical element 40, the second light processing layer 20, the polarization transflective element 11, and the second light processing layer 20 in sequence is reflected by the transflective optical element 40, then passes through the second light processing layer 20, and is converted into p-linear polarized light, which will pass through the polarization transflective element 11 and be absorbed by the second absorption type polarization element 12, so that stray light interference is not caused.
In one possible embodiment, the first light processing layer 10 further includes a second absorption-type polarization element 12, the second absorption-type polarization element 12 is disposed on a side of the polarization transflective element 11 away from the enemy light processing layer 10, and a transmission axis direction of the second absorption-type polarization element 12 is identical to a transmission axis k1 direction of the polarization transflective element 11. When the incident light from the side of the polarization transflective element 11 away from the second light processing layer 20 is unpolarized light or partially polarized light or linearly polarized light with a polarization direction different from the direction of k1, the absorption polarizer 12 transmits the polarized light beam with the direction of k1 from the incident light, and absorbs the rest of the light beam, so that the stray light problem caused by the rest of the light beam can be reduced.
In another embodiment, the first light processing layer 10 includes a third phase modulation element 13 and a polarization transflective element 11 in this order along the OZ axis forward direction, as shown in fig. 5, when the polarization state of incident light from the side of the first light processing layer 10 away from the second light processing layer 20 is a circular polarization state or a near circular polarization state, the third phase modulation element is specifically an 1/4 wave plate or 1/4 polymer phase retardation film, and the third phase modulation element 13 is disposed on the side of the polarization transflective element 11 away from the second light processing layer 20. If the incident light is right-handed circularly polarized light or right-handed nearly circularly polarized light (RC in fig. 5), the fast axis direction of the third phase modulating element 13 coincides with the OX direction and the slow axis direction coincides with the OY direction. When the incident light is left circularly polarized light or left near circularly polarized light (LC in fig. 5), the fast axis direction of the third phase modulating element 13 coincides with the OY direction and the slow axis direction coincides with the OX direction. The included angle between the transmission axis of the polarization transflective element 11 and the fast axis of the third phase modulating element 13 is afa degrees, 40 degrees < afa <50 degrees and greater than 40 degrees, the third phase modulating element 13 can convert more incident circularly polarized light or near circularly polarized light into linearly polarized light with the same direction as k1, and the energy utilization rate of the incident light is improved. Preferably, when afa is 45 degrees, the energy of the linearly polarized light converted by the circularly polarized light or the nearly circularly polarized light through the third phase modulation element 13 may be larger, and the energy utilization rate of the incident light is higher.
In yet another possible embodiment, the first light processing layer 20 includes the third phase modulation element 13, the second absorption-type polarization element 12, and the polarization transflective element 11 in this order along the OZ-axis forward direction.
The compact optical module 100 further comprises a light path adjusting mechanism 90, as shown in fig. 6, wherein AB indicates a placement position of a carrier of incident light incident into the compact optical module 100, which may be specifically an image display device, and AB is a focal plane position of the compact optical module 100. The second optical processing layer 20, the transflective optical element 40 and the third optical processing layer 30 are all disposed on the optical path adjusting mechanism 90, the position AB of the image display device is fixed with respect to the first optical processing layer 10, the distance L1 between the first optical processing layer 10 and the second optical processing layer 10 is adjusted by the optical path adjusting mechanism 90, and the distance AB of the image display device with respect to the focal plane of the compact optical module 100 is adjusted, so as to change the imaging distance of the image display device after passing through the compact optical module 100.
In another possible embodiment, the first light processing layer 10 is disposed on the optical path adjusting mechanism 90, the position AB of the image display device is fixed with respect to the second light processing layer 10, and the transflective optical element 40 and the third light processing layer 30 are fixed with respect to the second light processing layer, and by adjusting the position of the first light processing layer 10 between the image display position AB and the second light processing layer 20, the imaging distance of the image display device after passing through the compact optical module 100 can be changed, and at the same time, the distance from the image display position AB to the third light processing layer 30 can be fixed when the position of the first light processing layer 10 is adjusted and changed. In yet another possible embodiment, only the transflective optical element 40 is disposed on the optical path length adjusting mechanism 90, and the image forming distance of the image display device at the position AB after passing through the compact optical module 100 can be achieved by keeping the other elements fixed, and the distance from the position AB to the third light processing layer 30 is fixed.
In order to meet some specific functional requirements, the optical surface of the third light processing layer 30 in the compact optical module 100 on the side away from the second light processing layer 20 may be optionally coated with functional film layers such as a hard film, an anti-fog film, and the like, without limitation.
The utility model discloses the light beam is folding at the inside secondary reflection of compact optical module 100 through the ingenious integration and the design of layer 30 are handled to first light processing layer 10, second light processing layer 20, transflective optical element 40 and third light processing layer 100 to compact optical module 100 that preferred embodiment provided for, thereby has shortened compact optical module 100's module length, and the structure is compacter, the volume is littleer, and weight is also lighter. And the imaging distance of the image display device arranged at the AB position after passing through the compact optical module 100 is adjustable by arranging the optical path adjusting mechanism, so that a user with myopia or hyperopia can clearly view the information on the image display device arranged at the focal plane position of the compact optical module 100 without wearing myopia or hyperopia correcting glasses.
The present invention also provides a near-to-eye display device, which includes the compact optical module 100 and the image display device. In practical implementation, the near-eye display device further includes some elements for connecting, fixing, assembling and wearing the near-eye display device, which is not limited herein. For example, the near-eye display device may further include a head, an eye mask, and a structure for connecting the components included in the compact optical module 100. The eye cover can be used for covering human eyes to prevent ambient light from directly entering the eyes. Since the near-to-eye display device provided by the preferred embodiment of the present invention includes the compact optical module 100, the near-to-eye display device has the similar advantages to the compact optical module 100, which are not described herein again.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
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. The compact optical module is characterized by comprising a first optical processing layer, a second optical processing layer, a third optical processing layer and a transflective optical element, wherein the first optical processing layer, the second optical processing layer, the transflective optical element and the third optical processing layer are sequentially arranged;
the first light processing layer has a function of converting incident light into linearly polarized light and at least comprises a polarization transflective element, wherein the polarization transflective element transmits polarized light with the polarization direction consistent with the transmission axis direction of the polarization transflective element and reflects the polarized light with the polarization direction consistent with the vertical direction of the transmission axis of the polarization transflective element; the second light processing layer comprises a first phase modulation element which has the function of changing the phase of incident light, wherein the phase of the incident light is changed by beta degrees, and the phase of the incident light is changed by (a 180+80) to beta to (a 180+ 100); an included angle between the transmission axis direction of the polarization transflective element and the fast axis direction of the second light processing layer is 45 degrees;
the third light processing layer has the function of converting incident light into linearly polarized light and has selectivity on the direction of the polarized light, and comprises a second phase modulation element and a first absorption type polarization element, wherein the included angle between the fast axis direction of the second phase modulation element and the transmission axis direction of the first absorption type polarization element is 45 degrees, the phase change amount of the second phase modulation element on the incident light is gama degrees, and the gama is more than or equal to (a 180+80) and less than or equal to (a 180+ 100);
at least one surface of the transflective optical element is a curved surface and is provided with a transflective film layer.
2. The compact optical module of claim 1, wherein the second optical processing layer has a phase change amount beta (a x 180+90) for the incident light, wherein a is an integer.
3. The compact optical module of claim 1, wherein the third optical processing layer comprises a second phase modulation element having a change in phase of incident light gamma of (a x 180+90) and a first absorbing polarizer having a 45 degree angle between the transmission axis direction of the first absorbing polarizer and the fast axis direction of the second phase modulation element.
4. The compact optical module according to any of claims 1 to 3, wherein said first light management layer further comprises a third phase modulating element, wherein the angle between the fast axis direction of said third phase modulating element and the transmission axis of said transflective polarizing element is 45 degrees.
5. The compact optical module of any one of claims 1 to 3, wherein said first light management layer further comprises a second absorbing polarizer disposed on a side of said polarization transflective element away from said second light management layer, and a transmission axis direction of said second absorbing polarizer and a transmission axis direction of said polarization transflective element are aligned.
6. The compact optical module as recited in claim 4, further comprising an optical path length adjustment mechanism.
7. The compact optical module of claim 6, wherein said second light management layer, transflective optical element, and third light management layer are disposed on said optical path length adjusting mechanism.
8. The compact optical module of claim 6, wherein said first light management layer is disposed at said optical path length adjusting mechanism.
9. The compact optical module of claim 4, wherein said first light management layer further comprises a second absorbing polarizer disposed on a side of said third phase modulating element away from said polarization transflective element, and a transmission axis direction of said second absorbing polarizer and a transmission axis direction of said polarization transflective element are aligned.
10. A near-eye display device comprising the compact optical module according to any one of claims 1 to 9 and an image display device.
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| CN113219665A (en) * | 2021-04-30 | 2021-08-06 | 歌尔股份有限公司 | Optical lens group, optical system and head-mounted display device |
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| CN113219665A (en) * | 2021-04-30 | 2021-08-06 | 歌尔股份有限公司 | Optical lens group, optical system and head-mounted display device |
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