CN216248599U - Augmented reality display system and AR glasses - Google Patents
Augmented reality display system and AR glasses Download PDFInfo
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- CN216248599U CN216248599U CN202123054696.0U CN202123054696U CN216248599U CN 216248599 U CN216248599 U CN 216248599U CN 202123054696 U CN202123054696 U CN 202123054696U CN 216248599 U CN216248599 U CN 216248599U
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Abstract
The present invention provides an augmented reality display system comprising an image display, a linear polarization beam splitter, a phase retarder, a circularly polarized light reflector and a linear polarization absorbing element, the image display is used for providing a first image light beam with a first linear polarization direction, the first image light beam is reflected to the phase retarder by the linear polarization beam splitter, the phase retarder converts the first image light beam into a second image light beam with a first circular polarization direction, and the second image beam is transmitted to the circularly polarized light reflector, which converts the second image beam into a third image beam with a second circular polarization direction, and reflects back to the phase retarder, which converts the third image beam into a fourth image beam with a second linear polarization direction, and the fourth image beam transmits through the linear polarization beam splitter and the linear polarization absorbing element to form an image to be displayed. AR glasses including the augmented reality display system are also provided.
Description
Technical Field
The present invention relates to the field of Augmented Reality (AR) technologies, and in particular, to an AR glasses and an Augmented Reality display system.
Background
As shown in fig. 1, an augmented reality display system 10 commonly used in general AR glasses includes a curved reflector 12, a beam splitter 14 and an image display 16, an image light beam L transmitted from the image display 16 is firstly reflected by the beam splitter 14 to the curved reflector 12, reflected by the curved reflector 12 and amplified, and the amplified image light beam L becomes an image light beam L' to be displayed after transmitting the beam splitter 14 and is received by a human eye 18.
Wherein, the mirror surfaces of the beam splitter 14 and the curved mirror 12 are plated with a semi-reflective and semi-transmissive film (not shown) for visible light, because the transmittance and reflectance of the semi-reflective and semi-transmissive film for visible light are both 50%, only 50% of the energy of the image beam L reflected by the beam splitter 14 is transmitted to the curved mirror 12, only 50% of the energy is transmitted to the beam splitter 14 after being reflected by the curved mirror 12, and the energy of the image beam L 'to be displayed after being transmitted by the beam splitter 14 is only 50% of the energy transmitted by being reflected by the curved mirror 12, so that the energy of the image beam L' to be displayed finally received by the human eye 18 is at most only 12.5% (calculated from 50% to 50%) of the energy of the image beam L transmitted by the image display 16, when the existing augmented reality display system 10 is displaying the image to be displayed, the light energy utilization rate is low.
SUMMERY OF THE UTILITY MODEL
The utility model provides an augmented reality display system and AR glasses, wherein the augmented reality display system has high light energy utilization rate when displaying an image to be displayed.
The augmented reality display system provided by the utility model comprises an image display, a linear polarization beam splitter, a phase retarder, a circular polarization reflector and a linear polarization absorption element, wherein the linear polarization beam splitter is arranged at the output end of the image display, the linear polarization beam splitter is suitable for reflecting light with a first linear polarization direction and transmitting light with a second linear polarization direction, the phase retarder is arranged between the linear polarization beam splitter and the circular polarization reflector, the linear polarization absorption element is arranged on one side of the linear polarization beam splitter, which is far away from the phase retarder, and the linear polarization absorption element is suitable for absorbing the light with the first linear polarization direction and transmitting the light with the second linear polarization direction. The image display is used for providing a first image light beam with a first linear polarization direction, the first image light beam is reflected to the phase delay plate by the linear polarization light splitter, the phase delay plate converts the first image light beam into a second image light beam with a first circular polarization direction, the second image light beam is transmitted to the circular polarization light reflector, the circular polarization light reflector reflects the second image light beam into a third image light beam with a second circular polarization direction and reflects the third image light beam back to the phase delay plate, the phase delay plate converts the third image light beam into a fourth image light beam with a second linear polarization direction, the fourth image light beam transmits the linear polarization light splitter and the linear polarization absorption element to form an image to be displayed, and the circular polarization light reflector reflects the second image light beam into the third image light beam with the reflectivity between 55% and 100%.
In an embodiment of the utility model, the first linear polarization direction is orthogonal to the second linear polarization direction, the phase of the first linear polarization direction is 45 ° different from the phase of the first circular polarization direction, and the phase of the second linear polarization direction is 45 ° different from the phase of the second circular polarization direction.
In an embodiment of the utility model, the image display and the linear polarization beam splitter are disposed along a first direction, and the linear polarization beam splitter, the phase retarder, and the circularly polarized light reflector are disposed along a second direction.
In an embodiment of the utility model, the first ambient light enters the augmented reality display system from a first direction, wherein a portion of the first ambient light having the first linear polarization direction is absorbed by the linear polarization absorbing element, and a portion of the first ambient light having the second linear polarization direction transmits through the linear polarization absorbing element and the linear polarization beam splitter, is reflected back to the linear polarization beam splitter by the image display, and transmits through the linear polarization beam splitter and the linear polarization absorbing element.
In an embodiment of the utility model, the second ambient light enters the augmented reality display system from the second direction, wherein a portion of the second ambient light having the second circular polarization direction passes through the circularly polarized light reflector and is transmitted to the phase retarder, and is converted into the second linear polarization direction by the phase retarder, and is transmitted through the linear polarization beam splitter and the linear polarization absorbing element.
In an embodiment of the utility model, the transmittance of the second ambient light through the circularly polarized light reflector is between 50% and 75%.
In an embodiment of the utility model, the second image beam is reflected as the third image beam with a reflectivity of 100%, and the transmittance of the second external ambient light through the circularly polarized light reflector is 50%.
In an embodiment of the utility model, the augmented reality display system further includes a light-transmitting lens disposed on a side of the circularly polarized light reflector facing away from the retarder.
In an embodiment of the utility model, the circularly polarized light reflector includes a cholesteric liquid crystal layer, and the reflectivity is adjusted by the cholesteric liquid crystal layer.
The AR glasses provided by the utility model comprise the augmented reality display system.
The augmented reality display system adopts the circularly polarized light reflector, so that 55 to 100 percent of the energy of the image to be displayed can be received by human eyes finally, and the light energy utilization rate of the image to be displayed is further improved; meanwhile, the contrast of the image to be displayed relative to ambient light is improved by the arrangement of the circular polarized light reflector, so that a user has better watching quality.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of a conventional augmented reality display system.
Fig. 2 is a schematic structural diagram of an augmented reality display system according to an embodiment of the present invention.
Detailed Description
Fig. 2 is a schematic structural diagram of an augmented reality display system according to an embodiment of the utility model, and as shown in fig. 2, the augmented reality display system 20 includes an image display 22, a linear polarization beam splitter 24, a phase retarder 26, a circularly polarized light reflector 28, and a linear polarization absorbing element 30. The image display 22 is used for outputting the first image beam L1 with the first linear polarization direction, and in one embodiment, the image display 22 is composed of a transmission or reflection LOCS display source and an illumination light source assembly capable of outputting collimated parallel light illumination, or the image display 22 is composed of a fiber scanning imaging system and a collimating system.
The linear polarization beam splitter 24 is disposed at an output end of the image display 22, in one embodiment, the image display 22 and the linear polarization beam splitter 24 are disposed along a first direction D1, the linear polarization beam splitter 24 is disposed below the image display 22, and the linear polarization beam splitter 24 is adapted to reflect light with a first linear polarization direction and transmit light with a second linear polarization direction, wherein the first linear polarization direction is orthogonal to the second linear polarization direction. The linear polarization beam splitter 24, the phase retardation plate 26, and the circularly polarized light reflector 28 are disposed along a second direction D2, the second direction D2 is, for example, a direct viewing direction of a human eye 32, wherein the phase retardation plate 26 is disposed between the linear polarization beam splitter 24 and the circularly polarized light reflector 28, the linear polarization absorbing element 30 is disposed on a side of the linear polarization beam splitter 24 away from the phase retardation plate 26, the linear polarization absorbing element 30 is adapted to absorb light having the first linear polarization direction and transmit light having the second linear polarization direction, and in an embodiment, the linear polarization absorbing element 30 is, for example, a sheet or a film.
In one embodiment, the augmented reality display system 20 further includes a transparent lens 34 disposed on a side of the circularly polarized light reflector 28 facing away from the retarder 26. The circularly polarized light reflector 28 may include a cholesteric liquid crystal layer, and the circularly polarized light reflector 28 may be in the form of a film, a plate, or a coating.
Referring to fig. 2, the first image light beam L1 with the first linear polarization direction output by the image display 20 is reflected by the linear polarization beam splitter 24 to the phase retarder 26, the phase retarder 26 is, for example, a quarter-wave plate, the first image light beam L1 with the first linear polarization direction is converted into the second image light beam L2 with the first circular polarization direction by the phase retarder 26, in an embodiment, the phase of the first linear polarization direction is 45 ° different from the phase of the first circular polarization direction; the second image light beam L2 is transmitted to the circularly polarized light reflector 28, the circularly polarized light reflector 28 reflects the second image light beam L2 as a third image light beam L3 with a second circular polarization direction, and reflects the third image light beam L3 back to the phase retarder 26, the phase retarder 26 converts the third image light beam L3 reflected by the circularly polarized light reflector 28 into a fourth image light beam L4 with a second linear polarization direction, in an embodiment, the phase of the second linear polarization direction is different from the phase of the second circular polarization direction by 45 °; the fourth image light beam L4 passes through the linear polarization beam splitter 24 and the linear polarization absorbing element 30 to form an image Li to be displayed, which is received by the human eye 32.
In the embodiment of the augmented reality display system 20, the linear polarization beam splitter 24 can optimally transmit 100% of the energy of the first image light beam L1 to the phase retarder 26 to be converted into the second image light beam L2 and to the circularly polarized light reflector 28 without energy loss. The circularly polarized light reflector 28 can adjust the reflectivity by designing the cholesteric liquid crystal layer, and in one embodiment, the circularly polarized light reflector 28 reflects the second image light beam L2 as the third image light beam with a reflectivity between 55% and 100%, such as 55%, 60%, 70%, 80%, 90%, and 100%. Preferably, the reflectivity of the circularly polarized light reflector 28 is 100%, that is, 100% of the energy of the second image light beam L2 can be converted into the third image light beam L3 without energy loss, the third image light beam L3 is converted into the fourth image light beam L4 through the phase retarder 26, and the fourth image light beam L4 can be transmitted 100% through the linear polarization beam splitter 24 and the linear polarization absorbing element 30 to reach the human eye 32 without energy loss. Therefore, the energy of the image Li to be displayed finally received by the human eye 32 can reach at most 100% of the energy L1 of the first image light beam output by the image display 22, so that the augmented reality display system 20 of the embodiment has a high light energy utilization rate when displaying the image Li to be displayed.
As shown in fig. 2, in the first external ambient light WL1 emitted into the augmented reality display system 20 from the first direction D1, a portion of the first external ambient light WL1 with the first linear polarization direction is absorbed by the linear polarization absorption device 30, and a portion of the first external ambient light WL 1' with the second linear polarization direction transmits through the linear polarization absorption device 30 and the linear polarization beam splitter 24, is reflected by the image display 22 back to the linear polarization beam splitter 24, and transmits through the linear polarization beam splitter 24 and the linear polarization absorption device 30, and does not enter the human eye 32. Therefore, the augmented reality display system 20 can effectively prevent the first external ambient light WL1 from the first direction D1 from interfering the human eyes 32 to view the image to be displayed Li.
Furthermore, the second external ambient light WL2 entering the augmented reality display system 20 from the second direction D2 is transmitted to the circularly polarized light reflector 28 through the transparent lens 34, and the circularly polarized light reflector 28 transmits a portion of the second external ambient light WL 2' with the second circular polarization direction to the retarder 26, and is converted into the second linear polarization direction by the retarder 26, and then transmits through the linear polarization beam splitter 24 and the linear polarization absorbing element 30 and is received by the human eye 32. In one embodiment, the transmittance of the second external ambient light WL2 through the circularly polarized light reflector 28 is between 50% and 75% by the design of the cholesteric liquid crystal layer of the circularly polarized light reflector 28. Preferably, 50% of the energy of the second external environment light WL2 from the second direction D2 passes through the circularly polarized light reflector 28, and most preferably 100% of the energy of the second external environment light WL2 'passing through the circularly polarized light reflector 28 is received by the human eye 32 through the phase retarder 26, the linear polarization beam splitter 24 and the linear polarization absorbing element 30, so that the energy of the second external environment light WL 2' finally received by the human eye 32 after passing through the augmented reality display system 20 is 50% of the energy of the second external environment light WL2 entering from the second direction D2. Therefore, the embodiment of the augmented reality display system 20 can improve the contrast of the image Li to be displayed with respect to the ambient light.
In the augmented reality display system 20 according to the embodiment of the utility model, when the second image light beam L2 is reflected as the third image light beam L3 with a reflectivity of 100%, the energy of the image Li to be displayed finally received by the human eye 32 can reach 100% of the energy of the first image light beam L1 output by the image display 22, compared with the light energy utilization rate (e.g., 12.5%) of the conventional augmented reality display system 10, on the premise of outputting the same image light beam energy, the image Li to be displayed received by the human eye using the augmented reality display system 20 according to the embodiment of the utility model is brighter, and therefore has higher contrast; correspondingly, the augmented reality display system 20 according to the embodiment of the utility model has a higher light energy utilization rate, so that the first image light beam L1 output by the image display 22 can obtain an image to be displayed with the same brightness as that of the conventional augmented reality display system 10 on the premise of outputting less energy, thereby enabling the augmented reality display system 20 according to the embodiment of the utility model to have an advantage of low power consumption. Furthermore, an embodiment of the present invention further provides an AR glasses, including the augmented reality display system 20. In practical implementation, the AR glasses may further include some elements for connecting, fixing, assembling, and wearing the augmented reality display system, which is not limited herein. Since the AR glasses provided by the embodiment of the present invention include the augmented reality display system, the AR glasses have the beneficial effects similar to those of the augmented reality display system, which are not described herein again.
According to the above, the augmented reality display system of the embodiment of the utility model uses the circularly polarized light reflector to replace the semi-transmissive and semi-reflective curved surface reflector in the general AR glasses, so that 55% to 100% of the energy of the image to be displayed can be received by human eyes finally, and further the light energy utilization rate of the image to be displayed is improved; meanwhile, the contrast of the image to be displayed relative to ambient light is improved by the arrangement of the circular polarized light reflector, so that a user has better watching quality.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. An augmented reality display system, comprising: an image display, a linear polarization beam splitter, a phase delay plate, a circular polarization reflector and a linear polarization absorption element, wherein the linear polarization beam splitter is arranged at the output end of the image display, the linear polarization beam splitter is suitable for reflecting light with a first linear polarization direction and transmitting light with a second linear polarization direction, the phase delay plate is arranged between the linear polarization beam splitter and the circular polarization reflector, the linear polarization absorption element is arranged at one side of the linear polarization beam splitter, which is far away from the phase delay plate, the linear polarization absorption element is suitable for absorbing light with the first linear polarization direction and transmitting light with the second linear polarization direction, and the linear polarization absorption element is arranged at the other side of the linear polarization beam splitter, which is far away from the phase delay plate, and the linear polarization absorption element is suitable for absorbing light with the first linear polarization direction and transmitting light with the second linear polarization direction, wherein
The image display is used for providing a first image beam with the first linear polarization direction, the first image beam is reflected to the phase retarder by the linear polarization beam splitter,
the phase retarder converts the first image beam into a second image beam with a first circular polarization direction, and the second image beam is transmitted to the circular polarization reflector,
the circularly polarized light reflector reflects the second image light beam into a third image light beam with a second circular polarization direction and reflects the third image light beam back to the phase retarder, the phase retarder converts the third image light beam into a fourth image light beam with the second linear polarization direction, the fourth image light beam transmits the linear polarization beam splitter and the linear polarization absorption element to form an image to be displayed, and the reflectivity of the circularly polarized light reflector reflecting the second image light beam into the third image light beam is between 55 and 100%.
2. The augmented reality display system of claim 1, wherein the first linear polarization direction is orthogonal to the second linear polarization direction, the first linear polarization direction being 45 ° out of phase with the first circular polarization direction, the second linear polarization direction being 45 ° out of phase with the second circular polarization direction.
3. The augmented reality display system of claim 1, wherein the image display and the linear polarization beam splitter are disposed along a first direction, and the linear polarization beam splitter, the phase retarder, and the circularly polarized light reflector are disposed along a second direction.
4. The augmented reality display system of claim 3, wherein a first ambient light is incident into the augmented reality display system from the first direction, wherein a portion of the first ambient light having the first linear polarization direction is absorbed by the linear polarization absorbing element, and a portion of the first ambient light having the second linear polarization direction is transmitted through the linear polarization absorbing element and the linear polarization splitter, and is reflected by the image display back to and through the linear polarization splitter and the linear polarization absorbing element.
5. The augmented reality display system of claim 3, wherein a second ambient light enters the augmented reality display system from the second direction, wherein a portion of the second ambient light with the second circular polarization direction passes through the circularly polarized light reflector and passes to the phase retarder, and is converted by the phase retarder to have the second linear polarization direction, and is transmitted through the linear polarization splitter and the linear polarization absorbing element.
6. The augmented reality display system of claim 5, wherein the transmittance of the second ambient light through the circularly polarized light reflector is between 50% and 75%.
7. The augmented reality display system of claim 6, wherein the second image beam is reflected as the third image beam with a reflectivity of 100%, and the transmittance of the second ambient light through the circularly polarized light reflector is 50%.
8. The system of claim 1, further comprising a transparent lens disposed on a side of the circularly polarized light reflector facing away from the retarder.
9. The augmented reality display system of claim 1, wherein the circularly polarized light reflector comprises a cholesteric liquid crystal layer, and the reflectivity is adjusted by the cholesteric liquid crystal layer.
10. AR glasses comprising the augmented reality display system of any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115542558A (en) * | 2022-12-02 | 2022-12-30 | 杭州光粒科技有限公司 | Holographic polarization optical module, near-to-eye display system and augmented reality wearing equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115542558A (en) * | 2022-12-02 | 2022-12-30 | 杭州光粒科技有限公司 | Holographic polarization optical module, near-to-eye display system and augmented reality wearing equipment |
| CN115542558B (en) * | 2022-12-02 | 2024-01-26 | 杭州光粒科技有限公司 | Holographic polarization optical module, near-to-eye display system and augmented reality wearing equipment |
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Effective date of registration: 20220822 Address after: No. 5, Fengwu Road, Wujia Town, Fucheng District, Mianyang City, Sichuan Province, 621000 Patentee after: Longhua Phase New Materials (Mianyang) Co.,Ltd. Address before: 621000 No. 29, Fenghuang Middle Road, high end equipment manufacturing industrial park, Fucheng District, Mianyang City, Sichuan Province Patentee before: Sichuan Longhua Film Co.,Ltd. |
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