CN110927970A - AR optical display module and augmented reality display device - Google Patents
AR optical display module and augmented reality display device Download PDFInfo
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- CN110927970A CN110927970A CN201911268580.1A CN201911268580A CN110927970A CN 110927970 A CN110927970 A CN 110927970A CN 201911268580 A CN201911268580 A CN 201911268580A CN 110927970 A CN110927970 A CN 110927970A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
Abstract
The invention discloses an AR optical display module, which is characterized by comprising: the polarization component and the polarization piece are arranged along the light path in sequence; the polarization component is used for reflecting incident linear image light rays to the polarization piece, and the polarization component is used for reflecting the linear image light rays and transmitting external effective light rays; the linear image light reflected by the polarization piece and the transmitted external effective light reach the polarization component, and enter human eyes after being transmitted by the polarization component; the polarization component is also used for absorbing incident external stray light. By applying the technical scheme of the invention, the problem that the viewing experience of the user is influenced by the incidence of external stray light to human eyes is solved while the leakage of the viewing information of the user is ensured not to occur.
Description
Technical Field
The present disclosure relates to display devices, and particularly to an AR optical display module and an augmented reality display device.
Background
Augmented Reality (AR) technology is a new technology for seamlessly integrating real world information and virtual world information, and is characterized in that entity information (visual information, sound, taste, touch and the like) which is difficult to experience in a certain time space range of the real world originally is simulated and then superposed through scientific technologies such as computers, virtual information is applied to the real world and is perceived by human senses, so that the sensory experience beyond Reality is achieved. I.e. real environment and virtual objects are superimposed in real time onto the same picture or space.
Fig. 1 is a schematic structural diagram of an AR optical display module in an existing AR glasses or AR display device. The optical system of the conventional AR display device includes an image source 11, a beam splitter 3, a curved half mirror 4, and a lens 19 located above the beam splitter 3. Image light from the image source 11 is directed downwardly into the lens 19. The image light collimated by the lens 19 is incident to the spectroscope 3. Part of the image light is reflected by the spectroscope 3 to the curved surface half-reflecting mirror 4, and part of the image light is reflected by the curved surface half-reflecting mirror 4 to the spectroscope 3. Meanwhile, ambient light (external effective light) is incident from the right side to the left side (human eye direction) of the curved surface half mirror 4, and partial image light and partial ambient light finally reach human eyes at the same time, so that a user can see the external real environment and can also see image light superposed in the real environment.
However, when part of the image light and part of the ambient light enter the human eyes, the interference light (external stray light) also enters from the lower side of the spectroscope 3, and part of the interference light reaches the human eyes through the reflection of the spectroscope 3. That is, the user can see the interference light incident simultaneously when watching the image light and the external environment light, thereby reducing the watching experience of the user.
Referring to fig. 1, on the other hand, when the image light reflected by the spectroscope 3 reaches the curved surface half mirror 4, due to the partial transmission and partial reflection function of the curved surface half mirror 4, a part of the image light is transmitted out of the curved surface half mirror 4, and light leakage is generated, which causes leakage of information viewed by a user, and the user does not have a peeping prevention function and cannot well ensure privacy of the user.
It can be seen that the prior art is deficient and needs improvement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an AR optical display module with the functions of preventing theft and eliminating external stray light, and can solve the problem that the viewing experience of a user is influenced by the fact that the external stray light is incident to human eyes while the fact that the information of the user is not leaked is ensured.
The invention also aims to provide augmented reality display equipment, which can solve the problem that the viewing experience of a user is influenced by the incidence of external stray light to human eyes while ensuring that light leakage does not occur.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an AR optical display module comprising: the polarization component and the polarization piece are arranged along the light path in sequence; the polarization component is used for reflecting incident linear image light rays to the polarization piece, and the polarization piece is used for reflecting the linear image light rays and transmitting external effective light rays; the linear image light reflected by the polarization piece and the transmitted external effective light reach the polarization component, and enter human eyes after being transmitted by the polarization component; the polarization component is also used for absorbing incident external stray light.
Further, the polarization component comprises, in sequence: an absorbing polarizer, a retarder, and a transflective member; the transmission and reflection component is positioned on one side close to the polarizer, the absorption polarizer is positioned on one side far away from the polarizer, the incident linear image light is first linearly polarized light, and the absorption polarizer is used for transmitting the first linearly polarized light and reflecting second linearly polarized light; the polarizer is used for reflecting the first linearly polarized light and transmitting the second linearly polarized light, and the first linearly polarized light and the second linearly polarized light are mutually orthogonal.
Further, the retarder is used to convert incident linearly polarized light into circularly polarized light or elliptically polarized light.
Further, the retardation member is an 1/4 wave plate.
Further, the absorption polarization member and the delay member are attached to the transflective member.
Further, the polarizer is a curved polarizer.
Further, the AR optical display module further comprises: the image unit is arranged above the polarization component and is used for generating circularly polarized light or elliptically polarized light, the second linearly polarized light or the first linearly polarized light;
when the image unit is used for generating the circularly polarized light or the elliptically polarized light, the AR optical display module further includes: the polarizing unit is arranged between the image unit and the polarizing component and used for converting the circularly polarized light or the elliptically polarized light generated by the image unit into the first linearly polarized light, and the image unit and the polarizing unit are coaxially arranged;
when the image unit is used for generating the second linearly polarized light, the AR optical display module further includes: the wave plate unit is arranged between the image unit and the polarization assembly and used for converting the second linearly polarized light generated by the image unit into the first linearly polarized light, and the image unit and the wave plate unit are coaxially arranged.
Further, the image unit and the polarization component form an acute angle.
Further, the AR optical display module further comprises: the lens unit is arranged between the image unit and the polarization assembly and used for correcting the aberration of the first linearly polarized light, the first linearly polarized light or the second linearly polarized light, and the lens unit and the image unit are coaxially arranged.
The invention also provides augmented reality equipment comprising the AR optical display module.
By adopting the scheme, the AR optical display module and the augmented reality display equipment provided by the invention achieve the purposes of eliminating external stray light and preventing image light rays watched by a user from leaking by utilizing the ingenious light path design of the absorption type polaroid, the delay piece and the transflective lens through the mutual matching of the polarization component and the polarization piece, and improve the contrast between the light rays (the image light rays and the external effective light rays) required by the user and the external stray light rays, thereby improving the purpose of watching experience when the user uses the AR optical display module.
Drawings
Fig. 1 is a schematic structural diagram of an AR module in the prior art.
Fig. 2 is a schematic structural diagram of an AR optical display module according to a first embodiment of the present invention.
FIG. 3 is a schematic structural view of a second embodiment of an AR optical display module according to the present invention
Fig. 4 is a schematic structural diagram of an AR optical display module according to a second embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
The invention provides an AR optical display module and augmented reality display equipment comprising the same. As shown in fig. 2, the AR optical display module includes:
the polarizing component 2 and the polarizing member 3 are arranged in this order along the optical path. The polarizing component 2 is used to reflect the incident image light L1 to the polarizer 3. The image ray L1 is a linear image ray. The polarizer 3 has a function of reflecting the linear image light L1 and transmitting the ambient light from the external real environment, which is the light desired by the user and is referred to as the external effective light L2 in the embodiment of the present invention. After the polarizer 3 reflects the linear image light L1 and transmits the external effective light L2, the linear image light L1 reflected by the polarizer 3 and the external effective light L2 transmitted by the polarizer 3 reach the polarizer 2, and then enter human eyes after being transmitted by the polarizer 2, so that the user can see the external real environment and can also see the image light superimposed in the real environment, thereby realizing the augmented reality effect. Because the image light is linearly polarized light, after reaching the polarizer 3, the image light is only reflected back to the polarizing component 2 and cannot be transmitted out from the polarizer 3, so that the problem that information viewed by a user is leaked out cannot occur, and the privacy of the user can be effectively protected.
In addition, ambient light (the ambient light is light that is not needed by the user and is called interference light L3 or external stray light L3 in the embodiment of the present invention) incident from the lower side of the polarization component 2 reaches the polarization component 2 and is absorbed by the polarization component 2, so that the external stray light can be effectively eliminated, the contrast between light (image light and external effective light) required by the user and the external stray light is improved, and further, when the privacy of the user is effectively protected, the viewing experience of the user when using the AR optical display module can be improved.
With continued reference to FIG. 2, in another specific embodiment, the polarization component 2 may include:
sequentially setting: an absorption polarizer 201, a retarder 202, and a transflective member 203; the transflective component 203 is located adjacent to the polarizer 3 and the absorbing polarizer 201 is located away from the polarizer 3.
The absorption polarizer 201 functions as: transmitting light with a first polarization state, namely transmitting first linearly polarized light; light having the second polarization state is absorbed, i.e., the second linearly polarized light is absorbed. The polarizer 3 reflects the first linearly polarized light and transmits the second linearly polarized light. The first linearly polarized light and the second linearly polarized light are mutually in the orthogonal direction. When the first linearly polarized light is P-linearly polarized light, the second linearly polarized light may be S-linearly polarized light. When the first linearly polarized light is S-linearly polarized light, the second linearly polarized light may be P-linearly polarized light.
The retarder 202 converts incident linearly polarized light into circularly polarized light or elliptically polarized light, for example, P linearly polarized light into circularly polarized light or elliptically polarized light, or S linearly polarized light into circularly polarized light or elliptically polarized light. Specifically, the retarder 202 may be a waveplate of 1/4 wavelengths. In one embodiment, the absorbing polarizer 201 and the retarder 202 may be attached to the transflective member 203, which may reduce the thickness of the AR optical display module to some extent.
The transflective member 203 is a member having a partially transmissive and partially reflective function. The transflective member 203 may be specifically a transflective mirror. The structure of the transflective mirror can be as follows: the substrate is coated with functional film system on one side to make it have a certain transmission and reflection action, and coated with reflection reducing film on the other side to reduce stray light caused by interface reflection. In a specific implementation, the transflective member 203 may be a planar lens. The polarizer 3 may be a curved polarizer, and the curved polarizer is selected to improve the field angle and correct the aberration.
Next, the working process of the AR optical display module according to the embodiment of the present invention is described in detail by taking the incident linear image light as the first linearly polarized light, the absorbing type polarizer 201 transmits the first linearly polarized light, and absorbs the second linearly polarized light as an example.
Incident image light L1 is first linear polarization, this first linear polarization is incident to have certain transmission inverse ratio's the back of reflecting part 203, partial light is reflected to polarization piece 3, because polarization piece 3 has the function of reflecting first linear polarization transmission second linear polarization, when this first linear polarization is incident polarization piece 3, only can be reflected back to the reflection part 203 by polarization piece 3, and can not be transmitted away by polarization piece 3, consequently, the condition that image light reveals in the external environment can not take place, the light leak problem has been solved, thereby effectively protect user's privacy.
Furthermore, some of the first linearly polarized light that is returned to the transflective member 203 will be transmitted through the transflective member 203, and the polarization state of the light will not change and will continue to propagate toward the retarder 202. When passing through the retarder 202, since the retarder 202 has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light becomes elliptically or circularly polarized light and enters the absorption polarizer 201, and then enters human eyes after being transmitted through the absorption polarizer 201, so that the human eyes can see the first linearly polarized light L1.
Meanwhile, the external effective light L2 from the external environment is natural light, and includes a first linearly polarized light and a second linearly polarized light. Since the polarizer 3 has the functions of reflecting the first linearly polarized light and transmitting the second linearly polarized light, the external effective light L2 only transmits the second linearly polarized light after passing through the polarizer 3, and enters the polarizer 2. After the second linearly polarized light enters the transflective assembly 203 with a certain inverse transmittance ratio, part of the light is changed into elliptical or circularly polarized light by the retarder 202 and enters the absorbing polarizer 201, and the first linearly polarized light included in the elliptical or circularly polarized light enters human eyes after being transmitted by the absorbing polarizer 201. At the moment, the user can see the external real environment and can also see the image light superposed in the real environment, so that the augmented reality effect is realized.
Meanwhile, since the external stray light L3 (external interference light) incident from the lower side of the polarization assembly 2 is natural light, and passes through the absorption-type polarization plate 201, the retardation member 202 and the transmission/reflection member 203 having a certain inverse transmission ratio in this order, since the absorption-type polarization plate 201 has a function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when the natural light passes through the absorption-type polarization plate 201, only the first linearly polarized light can transmit and the second linearly polarized light is absorbed, at this time, the first linearly polarized light passes through the retardation member 202, becomes circularly polarized light or elliptically polarized light, and passes through the transmission/reflection member 203 having a certain inverse transmission ratio, part of the light is reflected and then passes through the retardation member 202 again, at this time, the circularly polarized light or elliptically polarized light becomes the second linearly polarized light, which is absorbed when passing through the absorption-type polarization plate 201, thereby eliminate external stray light, and then reach the contrast that promotes the required light of user (image light and external effective light) and external stray light, and then promote the user and use watching experience when AR optical display module assembly.
It is understood that the AR optical display module may further include an image unit 1 for generating image light. The light emitted by the image element 1 may be a first linearly polarized light, a second linearly polarized light, a circularly polarized light or an elliptically polarized light.
When the light emitted from the image unit 1 is the first linearly polarized light, the light emitted from the image unit 1 can be incident on the polarization component 2 without conversion, which will be described in detail by the embodiment shown in fig. 2. When the light emitted from the image unit 1 is the second linearly polarized light, the second linearly polarized light needs to be converted into the first linearly polarized light by using a wave plate unit, which will be described in detail by the embodiment shown in fig. 3. When the light emitted from the image unit is circularly polarized light or elliptically polarized light, the circularly polarized light or elliptically polarized light generated by the image unit 1 needs to be converted into the first linearly polarized light by using the polarizing unit, which will be described in detail with reference to the embodiment shown in fig. 4.
Referring to fig. 2, in another embodiment of the present invention, the AR optical display module further includes: an image unit 1 for generating a first linearly polarized light. The image unit 1 is disposed above the polarization component 2 and forms an acute angle with the polarization component 2. In this way, the first linearly polarized light L1 generated by the image element 1 can reach the polarization component 2. The image unit 1 in the present invention is a display device capable of providing image information, and specifically may be a display unit such as an LCD, an OLED, a micro-LED, and an LCoS. Preferably, the AR optical display module may further include: and a lens unit (not shown) disposed between the image unit 1 and the polarization assembly 2, and used for correcting aberration of the first linearly polarized light generated by the image unit 1, wherein the lens unit is disposed coaxially with the image unit 1, and the corrected first linearly polarized light is incident to the polarization assembly 2.
When the AR optical display module according to the embodiment of the present invention works, the first linearly polarized light L1 generated by the image unit 1 is refracted by the lens unit and then enters the polarization component 2. First linearly polarized light L1 is incident to and is passed through anti-part 203 after, and partial light is reflected to polarization piece 3, because polarization piece 3 has the function of reflection first linearly polarized light transmission second linearly polarized light, when this first linearly polarized light incides polarization piece 3, only can be reflected back to and pass through anti-part 203 by polarization piece 3, and can not be transmitted away by polarization piece 3, consequently can not take place the condition that image light revealed in the external environment, has solved the light leak problem to effectively protect user's privacy. Furthermore, some of the first linearly polarized light that is returned to the transflective member 203 will be transmitted through the transflective member 203, and the polarization state of the light will not change and will continue to propagate toward the retarder 202. When passing through the retarder 202, since the retarder 202 has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light becomes elliptically or circularly polarized light and enters the absorption polarizer 201, and then enters human eyes after being transmitted through the absorption polarizer 201, so that the human eyes can see the first linearly polarized light L1.
Meanwhile, the external effective light L2 from the external environment is natural light, and includes a first linearly polarized light and a second linearly polarized light. Since the polarizer 3 has the functions of reflecting the first linearly polarized light and transmitting the second linearly polarized light, the external effective light L2 only transmits the second linearly polarized light after passing through the polarizer 3, and enters the polarizer 2. After the second linearly polarized light enters the transflective assembly 203 with a certain inverse transmittance ratio, part of the light is changed into elliptical or circularly polarized light by the retarder 202 and enters the absorbing polarizer 201, and the first linearly polarized light included in the elliptical or circularly polarized light enters human eyes after being transmitted by the absorbing polarizer 201. At the moment, the user can see the external real environment and can also see the image light superposed in the real environment, so that the augmented reality effect is realized.
Meanwhile, since the external stray light L3 (external interference light) incident from the lower side of the polarization assembly 2 is natural light, and passes through the absorption-type polarization plate 201, the retardation member 202 and the transmission/reflection member 203 having a certain inverse transmission ratio in this order, since the absorption-type polarization plate 201 has a function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when the natural light passes through the absorption-type polarization plate 201, only the first linearly polarized light can transmit and the second linearly polarized light is absorbed, at this time, the first linearly polarized light passes through the retardation member 202, becomes circularly polarized light or elliptically polarized light, and passes through the transmission/reflection member 203 having a certain inverse transmission ratio, part of the light is reflected and then passes through the retardation member 202 again, at this time, the circularly polarized light or elliptically polarized light becomes the second linearly polarized light, which is absorbed when passing through the absorption-type polarization plate 201, thereby eliminate external stray light, and then reach the contrast that promotes the required light of user (image light and external effective light) and external stray light, and then promote the user and use watching experience when AR optical display module assembly.
As shown in fig. 3, in another embodiment of the present invention, the AR optical display module further includes:
an image unit 1 and a wave plate unit 4. The image unit 1 is used for generating a second linearly polarized light, the image unit 1 is disposed above the polarization component 2, and an acute angle is formed between the image unit 1 and the polarization component 2. In this way, the second linearly polarized light L1 generated by the image element 1 can reach the polarization component 2. The wave plate unit 4 is used for converting the second linearly polarized light generated by the image unit 1 into the first linearly polarized light, and the image unit 1 and the wave plate unit 4 are coaxially arranged. The wave plate unit can be selected from a wave plate with 1/2 wavelength or two wave plates with 1/4 wavelength.
Further, the embodiment of the present invention may further include: and the lens unit 5 is arranged between the image unit 1 and the polarization component 2, and the lens unit 5 is arranged above the polarization component 2 and is coaxially arranged with the image unit 1. When the lens unit 5 is disposed between the image unit 1 and the wave plate unit 4, the lens unit 5 is used for correcting the aberration of the second linearly polarized light generated by the image unit 1. When the lens unit 5 is disposed between the wave plate unit 4 and the polarization component 2, the lens unit 5 is used for correcting the aberration of the first linearly polarized light converted by the wave plate unit 4.
Next, the working process of the AR optical display module according to the embodiment of the present invention will be described in detail, assuming that the absorption polarizer 201 passes through the first linearly polarized light and absorbs the second linearly polarized light as an example.
The second linearly polarized light L1 generated by the image unit 1 is converted by the wave plate unit 4 to obtain the first linearly polarized light, and the first linearly polarized light is refracted by the lens unit 5 and then enters the polarization assembly 2. First linearly polarized light L1 is incident to and is passed through anti-part 203 after, and partial light is reflected to polarization piece 3, because polarization piece 3 has the function of reflection first linearly polarized light transmission second linearly polarized light, when this first linearly polarized light incides polarization piece 3, only can be reflected back to and pass through anti-part 203 by polarization piece 3, and can not be transmitted away by polarization piece 3, consequently can not take place the condition that image light revealed in the external environment, has solved the light leak problem to effectively protect user's privacy. Furthermore, some of the first linearly polarized light that is returned to the transflective member 203 will be transmitted through the transflective member 203, and the polarization state of the light will not change and will continue to propagate toward the retarder 202. When passing through the retarder 202, since the retarder 202 has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light becomes elliptically or circularly polarized light and enters the absorption polarizer 201, and then enters human eyes after being transmitted through the absorption polarizer 201, so that the human eyes can see the first linearly polarized light L1.
Meanwhile, the external effective light L2 from the external environment is natural light, and includes a first linearly polarized light and a second linearly polarized light. Since the polarizer 3 has the functions of reflecting the first linearly polarized light and transmitting the second linearly polarized light, the external effective light L2 only transmits the second linearly polarized light after passing through the polarizer 3, and enters the polarizer 2. After the second linearly polarized light enters the transflective assembly 203 with a certain inverse transmittance ratio, part of the light is changed into elliptical or circularly polarized light by the retarder 202 and enters the absorbing polarizer 201, and the first linearly polarized light included in the elliptical or circularly polarized light enters human eyes after being transmitted by the absorbing polarizer 201. At the moment, the user can see the external real environment and can also see the image light superposed in the real environment, so that the augmented reality effect is realized.
Meanwhile, since the external stray light L3 (external interference light) incident from the lower side of the polarization assembly 2 is natural light, and passes through the absorption-type polarization plate 201, the retardation member 202 and the transmission/reflection member 203 having a certain inverse transmission ratio in this order, since the absorption-type polarization plate 201 has a function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when the natural light passes through the absorption-type polarization plate 201, only the first linearly polarized light can transmit and the second linearly polarized light is absorbed, at this time, the first linearly polarized light passes through the retardation member 202, becomes circularly polarized light or elliptically polarized light, and passes through the transmission/reflection member 203 having a certain inverse transmission ratio, part of the light is reflected and then passes through the retardation member 202 again, at this time, the circularly polarized light or elliptically polarized light becomes the second linearly polarized light, which is absorbed when passing through the absorption-type polarization plate 201, thereby eliminate external stray light, and then reach the contrast that promotes the required light of user (image light and external effective light) and external stray light, and then promote the user and use watching experience when AR optical display module assembly.
As shown in fig. 4, in another embodiment of the present invention, the AR optical display module further includes:
an image unit 1 and a polarizing unit 6. Wherein the picture elements 1 are arranged to generate circularly or elliptically polarized light. The image unit 1 is disposed above the polarization component 2, and an acute angle is formed between the image unit 1 and the polarization component 2. In this way, circularly or elliptically polarized light L1 generated by the image element 1 can reach the polarizing component 2. The polarizing unit 6 is configured to convert circularly polarized light or elliptically polarized light generated by the image unit 1 into first linearly polarized light, and the image unit 1 and the polarizing unit 6 are coaxially disposed. The polarizing unit can transmit the first linearly polarized light, reflect the second linearly polarized light, and transmit the second linearly polarized light to absorb the first linearly polarized light.
Further, the embodiment of the present invention may further include: and the lens unit 5 is arranged between the image unit 1 and the polarization component 2, and the lens unit 5 is arranged above the polarization component 2 and is coaxially arranged with the image unit 1. When the lens unit 5 is disposed between the image unit 1 and the polarizing unit 6, the lens unit 5 is used to correct aberration of circularly polarized light or elliptically polarized light generated by the image unit 1. When the lens unit 5 is disposed between the polarizing unit 6 and the polarization assembly 2, the lens unit 5 is used for correcting the aberration of the first linearly polarized light converted by the wave plate unit 4.
The lens unit 5 is used for correcting the aberration of the first linearly polarized light converted by the polarizing unit 6.
Next, the working process of the AR optical display module according to the embodiment of the present invention will be described in detail, assuming that the absorption polarizer 201 passes through the first linearly polarized light and absorbs the second linearly polarized light as an example.
The circularly polarized light or elliptically polarized light L1 generated by the image unit 1 is converted by the polarizing unit 6 to obtain a first linearly polarized light, and the first linearly polarized light is refracted by the lens unit 5 and then enters the polarization assembly 2. First linearly polarized light L1 is incident to and is passed through anti-part 203 after, and partial light is reflected to polarization piece 3, because polarization piece 3 has the function of reflection first linearly polarized light transmission second linearly polarized light, when this first linearly polarized light incides polarization piece 3, only can be reflected back to and pass through anti-part 203 by polarization piece 3, and can not be transmitted away by polarization piece 3, consequently can not take place the condition that image light revealed in the external environment, has solved the light leak problem to effectively protect user's privacy. Furthermore, some of the first linearly polarized light that is returned to the transflective member 203 will be transmitted through the transflective member 203, and the polarization state of the light will not change and will continue to propagate toward the retarder 202. When passing through the retarder 202, since the retarder 202 has a function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light becomes elliptically or circularly polarized light and enters the absorption polarizer 201, and then enters human eyes after being transmitted through the absorption polarizer 201, so that the human eyes can see the first linearly polarized light L1.
Meanwhile, the external effective light L2 from the external environment is natural light, circularly polarized light or elliptically polarized light, and includes first linearly polarized light and second linearly polarized light. When the external effective light L2 passes through the polarizer 3, since the polarizer 3 has the functions of reflecting the first linearly polarized light and transmitting the second linearly polarized light, only the second linearly polarized light is transmitted after the external effective light L2 passes through the polarizer 3, and enters the polarizer 2. After the second linearly polarized light enters the transflective assembly 203 with a certain inverse transmittance ratio, part of the light is changed into elliptical or circularly polarized light by the retarder 202 and enters the absorbing polarizer 201, and the first linearly polarized light included in the elliptical or circularly polarized light enters human eyes after being transmitted by the absorbing polarizer 201. At the moment, the user can see the external real environment and can also see the image light superposed in the real environment, so that the augmented reality effect is realized.
Meanwhile, since the external stray light L3 (external interference light) incident from the lower side of the polarization assembly 2 is natural light, and passes through the absorption-type polarization plate 201, the retardation member 202 and the transmission/reflection member 203 having a certain inverse transmission ratio in this order, since the absorption-type polarization plate 201 has a function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when the natural light passes through the absorption-type polarization plate 201, only the first linearly polarized light can transmit and the second linearly polarized light is absorbed, at this time, the first linearly polarized light passes through the retardation member 202, becomes circularly polarized light or elliptically polarized light, and passes through the transmission/reflection member 203 having a certain inverse transmission ratio, part of the light is reflected and then passes through the retardation member 202 again, at this time, the circularly polarized light or elliptically polarized light becomes the second linearly polarized light, which is absorbed when passing through the absorption-type polarization plate 201, thereby eliminate external stray light, and then reach the contrast that promotes the required light of user (image light and external effective light) and external stray light, and then promote the user and use watching experience when AR optical display module assembly.
In summary, according to the AR optical display module and the augmented reality display device provided by the present invention, the polarization component and the polarization element are mutually matched, and the smart light path design of the absorption-type polarizer, the retardation element and the transflective lens is utilized, so as to achieve the purpose of eliminating external stray light and preventing leakage of image light viewed by a user, and improve the contrast between light (image light and external effective light) required by the user and the external stray light, thereby improving the viewing experience when the user uses the AR optical display module.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements 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 AR optical display module, comprising: the polarization component and the polarization piece are arranged along the light path in sequence; the polarization component is used for reflecting incident linear image light rays to the polarization piece, and the polarization piece is used for reflecting the linear image light rays and transmitting external effective light rays; the linear image light reflected by the polarization piece and the transmitted external effective light reach the polarization component, and enter human eyes after being transmitted by the polarization component; the polarization component is also used for absorbing incident external stray light.
2. The AR optical display module of claim 1, wherein the polarization component comprises, in order: an absorbing polarizer, a retarder, and a transflective member; the transmission and reflection component is positioned on one side close to the polarizer, the absorption polarizer is positioned on one side far away from the polarizer, the incident linear image light is first linearly polarized light, and the absorption polarizer is used for transmitting the first linearly polarized light and reflecting second linearly polarized light; the polarizer is used for reflecting the first linearly polarized light and transmitting the second linearly polarized light, and the first linearly polarized light and the second linearly polarized light are mutually orthogonal.
3. The AR optical display module of claim 2, wherein the retarder is configured to convert incident linearly polarized light into circularly polarized light or elliptically polarized light.
4. The AR optical display module of claim 3, wherein the retarder is an 1/4 wave plate.
5. The AR optical display module of any of claims 2 to 4, wherein the absorbing polarizer and the retarder are both attached to the transflective member.
6. The AR optical display module of any of claims 2 to 4, wherein the polarizer is a curved polarizer.
7. The AR optical display module of any of claims 2 to 4, further comprising: the image unit is arranged above the polarization component and is used for generating circularly polarized light or elliptically polarized light, the second linearly polarized light or the first linearly polarized light;
when the image unit is used for generating the circularly polarized light or the elliptically polarized light, the AR optical display module further includes: the polarizing unit is arranged between the image unit and the polarizing component and used for converting the circularly polarized light or the elliptically polarized light generated by the image unit into the first linearly polarized light, and the image unit and the polarizing unit are coaxially arranged;
when the image unit is used for generating the second linearly polarized light, the AR optical display module further includes: the wave plate unit is arranged between the image unit and the polarization assembly and used for converting the second linearly polarized light generated by the image unit into the first linearly polarized light, and the image unit and the wave plate unit are coaxially arranged.
8. The AR optical display module of claim 7, wherein the image unit is at an acute angle to the polarizing component.
9. The AR optical display module of claim 8, further comprising: the lens unit is arranged between the image unit and the polarization assembly and used for correcting the aberration of the circularly polarized light or the elliptically polarized light and the aberration of the first linearly polarized light or the second linearly polarized light, and the lens unit and the image unit are coaxially arranged.
10. An augmented reality device comprising the AR optical display module of any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911268580.1A CN110927970A (en) | 2019-12-11 | 2019-12-11 | AR optical display module and augmented reality display device |
| PCT/CN2020/134996 WO2021115344A1 (en) | 2019-12-11 | 2020-12-09 | Ar optical display module and augmented reality device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911268580.1A CN110927970A (en) | 2019-12-11 | 2019-12-11 | AR optical display module and augmented reality display device |
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| CN110927970A true CN110927970A (en) | 2020-03-27 |
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| CN201911268580.1A Pending CN110927970A (en) | 2019-12-11 | 2019-12-11 | AR optical display module and augmented reality display device |
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