CN210270371U - Augmented reality display assembly and augmented reality display device with same - Google Patents
Augmented reality display assembly and augmented reality display device with same Download PDFInfo
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- CN210270371U CN210270371U CN201920814178.8U CN201920814178U CN210270371U CN 210270371 U CN210270371 U CN 210270371U CN 201920814178 U CN201920814178 U CN 201920814178U CN 210270371 U CN210270371 U CN 210270371U
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Abstract
The utility model provides an augmented reality display module, including image element, eyepiece unit and refraction unit, the refraction unit includes first photoswitch and first birefringent crystal, and first switch is located between image element and the first birefringent crystal, and the refraction unit still includes second birefringent crystal and first phase delay ware, and the phase delay of first phase delay ware is pi/2 and sets up between first birefringent crystal and second birefringent crystal. The utility model also provides a display device who uses above-mentioned augmented reality display module. The utility model discloses utilize first birefringent crystal, second birefringent crystal and set up the first phase delay ware between first birefringent crystal, second birefringent crystal and realize "spherical imaging" image output mode of many depth of field, can ensure that image output's quality maintains under this high quality output mode of "spherical imaging", the image distortion is few, and the definition of imaging improves, has extensive application prospect and high economic value.
Description
Technical Field
The utility model relates to an augmented reality technical field especially relates to an augmented reality display module and have augmented reality display device of this subassembly.
Background
The augmented Reality technology (AR) can integrate a virtual world and a real world on a screen, achieves sensory experience exceeding and increasing Reality by real-time superposition of multi-sensory simulation information such as vision, hearing and the like and real environment information, and has a very wide application prospect in various fields such as entertainment, medical treatment, military and the like. The augmented reality display component is a core component of the whole system and directly displays the superposed image of the simulation information and the environmental information to a user. When the existing augmented reality display component uses the birefringent crystal to realize multi-depth-of-field image display, because the adjustment rules of the birefringent crystal to different linearly polarized light in the opening state and the closing state are inconsistent, images observed by users at different depth of field are inconsistent, so that image display differentiation is caused, and further image imaging quality is influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need for an improved augmented reality display module and an augmented reality display apparatus having the same, where the augmented reality display module can overcome the problem of image differentiation caused by inconsistent adjustment rules of the birefringent crystal for different linearly polarized light, and has a wide application prospect and an excellent economic effect.
The utility model provides an augmented reality display module, including image element, eyepiece unit and set up in refraction unit between image element and the eyepiece unit, refraction unit includes first photoswitch and first birefringent crystal, first switch is located between image element and the first birefringent crystal, refraction unit still includes second birefringent crystal and first phase delay ware, the phase delay of first phase delay ware is pi/2 and set up in between first birefringent crystal and the second birefringent crystal.
Further, the refraction unit further comprises a first polarizer, and the first polarizer is arranged between the image unit and the first optical switch; the polarization direction of linearly polarized light output by the first polarizer is named as a first direction, the direction perpendicular to the first direction is named as a second direction, the crystal optical axis of the first birefringent crystal is perpendicular to the second direction, and the crystal optical axis of the second birefringent crystal is perpendicular to the first direction.
Further, the crystal optical axis of the first birefringent crystal is perpendicular to the second direction and forms an included angle of 45 degrees with the first direction; the crystal optical axis of the second birefringent crystal is perpendicular to the first direction and forms an included angle of 45 degrees with the second direction.
Further, the refraction unit further comprises a second optical switch, the eyepiece unit comprises a polarization reflector, a second phase retarder and an optical coupler, the second optical switch is arranged between the second birefringent crystal and the polarization reflector, and the second phase retarder is arranged between the polarization reflector and the optical coupler and delays the phase of the polarized light transmitted between the polarization reflector and the optical coupler.
Further, the phase delay of the phase delayer is pi/4.
Further, the refraction unit further comprises a second polarizer, and the second polarizer is arranged between the second optical switch and the polarization reflector.
Further, the first polarizer is a polarizer; and/or the presence of a catalyst in the reaction mixture,
the second polarizer is a polarizing plate.
Further, the brightness of the image unit is 5000 nits or more; and/or the presence of a catalyst in the reaction mixture,
the refresh rate of the picture cells is above 120 Hz.
Further, the response time of the optical switch is less than 10 milliseconds; and/or the presence of a catalyst in the reaction mixture,
the light transmittance of the optical switch is greater than 90%.
The utility model also provides an augmented reality display device, including augmented reality display module, augmented reality display module is the arbitrary one of the aforesaid augmented reality display module.
The utility model discloses utilize first birefringent crystal, second birefringent crystal and set up the first phase delay ware between first birefringent crystal, second birefringent crystal and realize "spherical imaging" image output mode of many depth of field, can ensure that image output's quality maintains under this high quality output mode of "spherical imaging", the image distortion is few, and the definition of imaging improves, has extensive application prospect and high economic value.
Drawings
Fig. 1 is a schematic structural diagram of an augmented reality display module according to an embodiment of the present invention;
FIG. 2 is a schematic view of the optical path of the eyepiece unit after adding a compensation surface;
figure 3 is a graph showing the MTF curve of an image at a first depth of field,
figure 4 is a distortion grid showing an image at a first depth of field,
figure 5 is a graph showing the MTF curve of an image at a second depth of field,
FIG. 6 is a distortion mesh showing an image at a second depth of field;
FIG. 7 is a schematic diagram of an optical path of the first birefringent crystal shown in FIG. 1;
FIG. 8 is a schematic diagram of the optical path of the second birefringent crystal shown in FIG. 1;
FIG. 9 is a schematic optical path diagram of the first phase retarder shown in FIG. 1;
fig. 10 is a schematic structural diagram of an augmented reality display module according to another embodiment of the present invention.
Description of the main elements
The following detailed description of the invention will be further described in conjunction with the above-identified drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an augmented reality display assembly 100 according to an embodiment of the present invention. The augmented reality display assembly 100 is for viewing by a user for displaying image information projected into the user's eyes.
In this embodiment, the augmented reality display module 100 is applied to wearable augmented reality glasses (not shown), the augmented reality display module 100 serves as a lens of the augmented reality glasses, and a user observes virtual environment information and real environment information by wearing the augmented reality glasses and observing the augmented reality display module 100.
It is understood that in other embodiments, the augmented reality display assembly 100 may be used in other devices such as wearable helmets, as long as the augmented reality display assembly 100 is perceived and observed by the user.
The augmented reality display assembly 100 includes an image unit 10, an eyepiece unit 20, and a refraction unit 30, the refraction unit 30 being located between the image unit 10 and the eyepiece unit 20; the image unit 10 is used for displaying image information for a user to observe, the eyepiece unit 20 is used for converging image light refracted by the refraction unit 30 and transmitting the image light to human eyes for imaging, and the refraction unit 30 is used for selectively refracting the image light provided by the image unit 10.
The image light provided by the image unit 10 changes its polarization direction after being selectively refracted by the refraction unit 30, and is converged at different positions after being converged by the ocular unit 20, thereby forming different depths of field.
In particular, the image unit 10 is a display, which may be a CRT display, an LCD display, a PDP display or an OLED display.
In the present embodiment, in consideration of comprehensive performance and cost advantages, the sony OLED screen ECX337A display is used as the image unit 10 in the present embodiment, the display is a microdisplay, the diagonal length is only 0.5 inch, the resolution reaches 1280 × 960, the product competitiveness is better, and the user experience is relatively better.
It is understood that in other embodiments, the image unit 10 can also be selected from displays other than the sony OLED screen ECX337A display, and the present invention does not limit the specific type of the display adopted by the image unit 10 nor the specific model of the display adopted by the image unit 10, as long as the display adopted by the image unit 10 can normally output the environmental image information and the virtual image information.
The eyepiece unit 20 is positioned between the user's eye and the image unit 10, and the eyepiece unit 20 may be disposed obliquely with respect to the image unit 10 as necessary to smoothly introduce image information to the user's eye.
It is to be understood that the eyepiece unit 20 may employ either a positive type eyepiece or other types of eyepieces other than the positive type eyepiece, such as a negative type eyepiece; the number of eyepieces included in the eyepiece unit 20 may be one or plural.
The refraction unit 30 includes a first polarizer 31, a first optical switch 32, and a first birefringent crystal 33, the first polarizer 31 is disposed between the image unit 10 and the first optical switch 32, and the first birefringent crystal 33 is disposed between the first optical switch 32 and the eyepiece unit 20.
The first polarizer 31 is used for converting the image light displayed by the image unit 10 from natural light to linearly polarized light, and the first optical switch 32 is used for adjusting the polarization direction of the linearly polarized light, so that the natural light emitted by the image unit 10 has different polarization directions; the first birefringent crystal 33 is used to refract the linearly polarized light transmitted from the first optical switch 32, so that the linearly polarized light with different polarization directions has different refraction directions.
The natural light including image information emitted from the image unit 10 is converted into linearly polarized light by the polarization of the first polarizer 31, and then different polarization directions are formed under the adjustment of the first optical switch 32, and finally, a dual-depth-of-field image display is formed under the different refraction effects of the first birefringent crystal 33 on the polarized light with different polarization directions.
Specifically, the first polarizer 31 can convert light rays into polarized light in a natural light state, which utilizes anisotropy of optical properties of a specific material to realize polarization of natural light.
In the present embodiment, the first polarizer 31 polarizes natural light including image information emitted from the image unit 10 using a polarizing plate, and the first polarizer 31 may use a microcrystalline polarizing plate such as a tourmaline wafer or a molecular polarizing plate such as a wire grid polarizing plate.
It is understood that in other embodiments, the first polarizer 31 may also be a polarizer of other types besides a polarizer, such as a polarization splitting prism, as long as the polarizer can polarize the image information.
The first optical switch 32 is connected to the first polarizer 31, and is used for adjusting the polarization direction of the optical signal output by the first polarizer 31. When the first optical switch 32 is turned on, the first optical switch 32 acts on the first polarizer 31; when the first optical switch 32 is turned off, the first optical switch 32 has no regulating effect on the optical signal output from the first polarizer 31.
As far as the structure of the first optical switch 32 itself is concerned, it may adopt a conventional structure. In the present embodiment, the first optical switch 32 is a liquid crystal light valve; preferably, the response time of the first optical switch 32 is set to 10 milliseconds or less, and the light transmittance of the first optical switch 32 is set to a range greater than 90%.
It is understood that in other embodiments, the first optical switch 32 may also adopt other types of optical switching elements such as an electro-optical switch, a thermo-optical switch, an acousto-optical switch, a micro-mechanical optical switch, and a conventional mechanical optical switch, as long as the first optical switch 32 of the type can realize the direction adjustment of the first polarizer 31; the response time and the transmittance of the first optical switch 32 can be selected according to actual conditions, for example, the response time of the first optical switch 32 is set to be more than 10 ms, and the transmittance of the first optical switch 32 is set to be less than 90%.
The first birefringent crystal 33 is located on the optical path between the first optical switch 32 and the eyepiece unit 20, and is used for refracting the polarized light; the first birefringent crystal 33 has different refractive indexes for linearly polarized light with different polarization directions, and the interaction between the first birefringent crystal 33 and the first optical switch 32 enables the acted image light to have different transmission directions.
In the present embodiment, the first birefringent crystal 33 is a birefringent crystal prism; the first birefringent crystal 33 adopts a birefringent crystal prism, so that the incident surface of the light on the birefringent crystal prism and the optical axis and the emergent surface of the birefringent crystal prism are parallel to each other, only the refractive indexes of linearly polarized light in different polarization directions are different when the linearly polarized light passes through the first birefringent crystal 33, the principal light is still in a state of superposition and non-dislocation, and no additional aberration is generated.
Further, the refractive index of the first birefringent crystal 33 is 1.6585 for O light and 1.4865 for E light.
It is understood that in other embodiments, the first birefringent crystal 33 may have other shapes besides the birefringent crystal prism, as long as the shape and type of the first birefringent crystal 33 can refract the linearly polarized light adjusted by the first optical switch 32; the first birefringent crystal 33 may have a refractive index other than the above refractive index for light of different polarization (e.g., O light or E light), as long as the refractive index of the first birefringent crystal 33 is different for light of different polarization directions.
In practical use, considering that the first optical switch 32 needs to continuously switch its on-off state, the first optical switch 32 preferably has a high response frequency, so that the first optical switch 32 has a sufficient response speed to switch its on-off state and adapt to different display requirements of the image unit 10.
The display principle of the augmented reality display assembly 100 with multiple depths of field is briefly explained as follows:
after passing through the first polarizer 31 in the refraction unit 30, the image light generated by the image unit 10 only retains linearly polarized light (such as ordinary light, abbreviated as O light) in a certain characteristic direction; when the first optical switch 32 is turned on, the linearly polarized light (O light) is converted into linearly polarized light (e.g. extraordinary light, abbreviated as E light) in another polarization direction by the adjustment of the first optical switch 32. When the first optical switch 32 is turned off, the first optical switch 32 does not change the polarization direction of the linearly polarized light, and the linearly polarized light (O light) is directly incident into the first birefringent crystal 33;
the first birefringent crystal 33 has different refractive indexes for linearly polarized light in different directions; when the first optical switch 32 is turned on, the first birefringent crystal 33 refracts the O light at a first refraction angle, and the image light in the form of the O light is converged to human eyes after passing through the convergence function of the eyepiece unit 20, so as to obtain an image which can be observed by a user and has a first depth of field; when the first optical switch 32 is turned off, the first birefringent crystal 33 refracts the E light at the second refraction angle, and the image light in the form of the E light is converged to the human eyes after passing through the converging action of the eyepiece unit 20, so as to obtain an image which can be observed by the user and has the second depth of field, thereby completing the display process of the augmented reality display assembly 100 with the double depth of field.
Further, when the first optical switch 32 is continuously refreshed at a proper frequency, the depth of field perceived by the human eye may be between the first depth of field and the second depth of field, thereby forming a controllable adjustment of the optical parameter of the depth of field over the first depth of field and the second depth of field.
The present invention is not limited to the first optical switch 32 that can adjust only the direction of the O light toward the E light. It is understood that in other embodiments, the first optical switch 32 may also achieve the adjustment of the direction of the E light to the direction of the O light.
The utility model provides an augmented reality display module 100 sets up first polarizer 31 between image unit 10 and eyepiece unit 20, first light switch 32 and first birefringence crystal 33, utilize first birefringence crystal 33 to form the image of different depth of field to the different refraction effect of the polarized light on the different polarization direction, so can present the virtual information of arbitrary degree of depth, the convergence conflict of regulation has been solved, user experience degree has not only been improved, and can laminate the observation custom of people's eye more, can avoid the user to appear fatigue after observing for a long time, nausea, adverse reaction such as vomiting, wide application prospect has.
In an embodiment of the present invention, the refraction unit 30 further includes a projection unit 34, the projection unit 34 is located between the first birefringent crystal 33 and the eyepiece unit 20, the projection unit 34 is configured to transmit the linearly polarized light transmitted by the first birefringent crystal 33 into an enlarged relay real image, the projection unit 34 utilizes the relay amplification effect of itself to enable the image signal output by the refraction unit 30 to be transmitted to the eyepiece unit 20 more clearly, so that the transmission loss between the refraction unit 30 and the eyepiece unit 20 is reduced, and image transmission over a longer distance can be implemented.
Further, the projection ratio of the projection unit 34 is preferably 1.6 or less, so as to reduce the compactness of the projection unit, effectively reduce the spatial dimension of the whole assembly and reduce the optical path space, and leave more room for industrial design, making it more ergonomic.
In this embodiment, the projection unit 34 includes four lenses, and the eyepiece unit 20 includes two half-lenses. The data of the equivalent optical path are shown in table 1:
TABLE 1 equivalent light path data sheet
Referring to fig. 2, fig. 2 is a schematic diagram of an optical path after the eyepiece unit 20 is added with a compensation surface. The effect of adding the compensation surface to the eyepiece unit 20 is to allow the human eye to view the real world through the eyepiece unit without distortion of the real world picture.
Referring to fig. 3 to 6 together, fig. 3 is a graph showing an MTF curve of an image at a first depth of field, fig. 4 is a graph showing a distortion mesh of the image at the first depth of field, fig. 5 is a graph showing an MTF curve of an image at a second depth of field, and fig. 6 is a graph showing a distortion mesh of the image at the second depth of field.
In the present embodiment, the exit pupil diameter is 10mm, the exit pupil distance is 18mm, and the full field angle is 50 degrees. Excellent imaging quality is obtained at the first depth and the second depth, the maximum field distortion is less than 0.2%, the MTF (Modulation Transfer Function) of the maximum field at the cutoff frequency of 30lp/mm is larger than 0.4, the MTF value of the maximum field at the cutoff frequency of 30lp/mm at the second depth is more than 0.6, and excellent light field display effect can be obtained.
In an embodiment of the present invention, the augmented reality display module 100 is further provided with a control unit (not shown), the control unit is connected to the first optical switch 32 and the image unit 10 through a medium such as a wire, and the control unit is used for synchronously controlling the operation states of the first optical switch 32 and the image unit 10, and controlling the on/off of the first optical switch 32 according to the depth of field required to be displayed by the image unit 10. The control unit is integrated inside the augmented reality display assembly 100, so that the integration level of the whole system can be improved, and the control function of the whole system can be realized.
It is understood that in other embodiments, the control unit may be disposed outside the augmented reality display assembly 100, that is, the control unit is disposed outside the augmented reality display assembly 100 as an environmental element, as long as the control unit can be communicatively connected with the first light switch 32 and the image unit 10 and cooperatively control the operation states of the first light switch 32 and the image unit 10.
In one embodiment of the present invention, in order to improve the quality of image display, the resolution of the image unit 10 is preferably 1080P or more, and the luminance of the image unit 10 is preferably 5000 nit (nit) or more. The resolution and brightness of the image unit 10 are set to be high, which is helpful for improving the reality of image information display and the experience of a user, so that the fidelity of the virtual image information superposed on the real image information is higher.
In one embodiment of the present invention, in order to ensure the user experience and to allow for the image display with double depth of field, the refresh rate of the image unit 10 is 120Hz or more (twice or more of 60Hz with single depth of field) so that the user has no flicker when observing; and/or the presence of a catalyst in the reaction mixture,
the extinction ratio of the first polarizer 31 is 10000:1 or more, so that the polarized light polarized by the first polarizer 31 does not have o light and e light at the same time, thereby ensuring that the image observed by the user through the eyepiece unit 20 does not have two depths at the same time, avoiding image crosstalk and improving the imaging quality.
In one embodiment of the present invention, in order to reduce the thickness of the first birefringent crystal 33, the refractive index difference of the first birefringent crystal 33 for o-light or e-light is preferably greater than 0.2, so as to reduce the requirement for the thickness of the first birefringent crystal 33 during refraction, and further reduce the system load.
In an embodiment of the present invention, in order to improve the visual field of the user, the eyepiece unit 20 of the present invention includes an optical coupler 23, the optical coupler 23 is an aspherical mirror, and its surface equation is:
wherein c is the curvature at the vertex of the curved surface; k is the conic constant of the surface, AiI-order aspheric surface of curved surfaceAnd (4) the coefficient.
The utility model discloses well applied optical coupler 23 has the advantage of big exit pupil diameter, long exit pupil distance and wide angle of vision, and the situation of strabismus when the user wears can be satisfied to big exit pupil diameter, and long exit pupil distance can satisfy myopia glasses and the use of televiewer person of wearing, and the wide angle of vision can present virtual information more truthfully, makes virtual information and real world fuse together better. According to the experimental measurement, the utility model discloses in optical coupler 23's that uses angle of vision can reach 50, have the user experience of the field of vision of broad and preferred.
Certainly, the augmented reality display component 100 may further be provided with a plurality of functional elements to achieve improvement of user experience, for example, an Inertial Measurement Unit (IMU) may be further integrated on the augmented reality display component 100, and the control unit controls the Inertial measurement unit to detect the pose of the whole machine, so as to further improve the user experience.
When the conventional augmented reality display component utilizes the first birefringent crystal 33 to realize multi-depth-of-field image display, the adjustment rules of the birefringent crystal to different linearly polarized light are different, so that the imaging quality of the birefringent crystal during image display is difficult to ensure simultaneously.
For example, the refractive index of the birefringent crystal to O light does not change with the change of the incident angle of O light, and the refractive index of the birefringent crystal to O light is constant, so that a "spherical imaging" effect is presented when an image is displayed; the refractive index of the birefringent crystal to the E light changes along with the change of the incident angle of the E light, the refractive indexes of the birefringent crystal at the sagittal plane and the meridional plane are different, and the birefringent crystal can present a cylindrical imaging effect when an image is displayed. This results in different imaging effects at different depths of field, and the user may switch back and forth between different images with different imaging effects when observing, which affects the normal observation of the images.
The utility model provides an augmented reality display module 100 is through setting up two birefringent crystals and setting up a phase delay ware for the formation of image effect of different scenic depths keeps unanimous, thereby overcomes the image quality decline problem that leads to because of adopting single birefringent crystal.
Specifically, the refractive unit 30 further includes a second birefringent crystal 35 and a first phase retarder 36, the first phase retarder 36 is located between the first birefringent crystal 33 and the second birefringent crystal 35, and the second birefringent crystal 35 is located between the first phase retarder 36 and the eyepiece unit 20. The first phase retarder 36 has a phase retardation of pi/2, and serves to convert the linearly polarized light into linearly polarized light perpendicular to the original vibration direction.
When the first optical switch 32 is turned off, the linearly polarized light formed by the polarizer 31 after polarization is not converted by the first optical switch 32, and at this time, the linearly polarized light in the initial state forms an output mode of "spherical imaging" through the first birefringent crystal 33; the polarization direction of the linearly polarized light after passing through the first phase retarder 36 is vertical to the initial state, and an output mode of spherical imaging is still formed through the second birefringent crystal 35; in general, the refractive element 30 forms an output mode of "spherical imaging" after the first optical switch 32 is turned off;
after the first optical switch 32 is turned on, linearly polarized light formed after the polarizer 31 performs a polarization function is converted by the first optical switch 32, and then the linearly polarized light after being converted forms an output mode of cylindrical imaging through the first birefringent crystal 33; the linearly polarized light is converted into linearly polarized light with the same vibration direction as the initial state through the first phase retarder 36, and then the linearly polarized light still forms an output mode of cylindrical imaging through the second birefringent crystal 35, but cylindrical surfaces formed by the first birefringent crystal 33 and the second birefringent crystal 35 are mutually vertical; in general, the refractive element 30 forms an output mode of "spherical imaging" after the first optical switch 32 is turned on.
Referring to fig. 7 to 9 together, fig. 7 is a schematic optical path diagram of the first birefringent crystal 33 shown in fig. 1, fig. 8 is a schematic optical path diagram of the second birefringent crystal 35 shown in fig. 1, and fig. 9 is a schematic optical path diagram of the first phase retarder 36 shown in fig. 1.
Light entering the first birefringent crystal 33 passes through the first birefringent crystal 33 along the propagation direction 301; the polarization direction of the linearly polarized light polarized by the first polarizer 31 is named as a first direction 302, the direction perpendicular to the first direction 302 is named as a second direction 303, and the crystal optical axis 331 of the first birefringent crystal 33 is set to be located in the plane formed by the propagation direction 301 and the first direction 302, that is, the crystal optical axis 333 of the first birefringent crystal 33 is preferably perpendicular to the second direction 303.
Light entering the second birefringent crystal 35 passes through the second birefringent crystal 35 along the propagation direction 301; the polarization direction of the linearly polarized light after polarization by the first polarizer 31 is named as a first direction 302, the direction perpendicular to the first direction 302 is named as a second direction 303, and the crystal optical axis 351 of the second birefringent crystal 35 is arranged to be located in the plane formed by the propagation direction 301 and the second direction 303, that is, the crystal optical axis 351 of the second birefringent crystal 35 is preferably perpendicular to the first direction 302. Thus, the image imaging quality is better.
Still further, the crystal optic axis 331 of the first birefringent crystal 33 is perpendicular to the second direction 303 and forms an angle of 45 ° with the first direction 301, and the crystal optic axis 351 of the second birefringent crystal 35 is preferably perpendicular to the first direction 302 and forms an angle of 45 ° with the second direction 303. Thus, the image forming quality is optimal.
Further, the optical axis 361 of the first phase retarder 36 is perpendicular to the propagation direction 301 of the light, and forms an angle of 45 degrees with both the first direction 302 and the second direction 303, thereby completing the position-limiting retardation function.
The utility model discloses utilize first birefringent crystal 33, second birefringent crystal 35 and set up first phase delay ware 36 between first birefringent crystal 33, second birefringent crystal 35 to realize the sphere image output mode of many depth of field, can ensure that image output's quality maintains under this high quality output mode of sphere, and the image distortion is few, and the imaging definition improves.
Referring to fig. 10, fig. 10 is a schematic structural diagram of an augmented reality display assembly 100 according to another embodiment of the present invention.
The utility model discloses an in the embodiment, the light intensity when considering the linearly polarized light to form images is not enough, in order to compensate the loss of light intensity and display brightness, augmented reality display module 100 in this embodiment has additionally set up an optical switch on first optical switch 32's basis, utilizes two optical switches and a polarized reflector that have the same on-off state to compensate the light intensity loss.
Specifically, the augmented reality display assembly 100 further includes a second optical switch 37, the second optical switch 37 being located between the projection unit 34 and the second birefringent crystal 35; the second optical switch 37 and the first optical switch 32 are in the same operating state, that is, the second optical switch 37 and the first optical switch 32 are in the on or off state at the same time, and the operating states of the two are in the same coupling state under the control of the control unit.
As far as the structure of the second optical switch 37 itself is concerned, it may adopt a conventional structure, either using the same switching device as the first optical switch 32 or using a different switching device from the first optical switch 32. In the present embodiment, in consideration of the compatibility of the entire components, the second optical switch 37 and the first optical switch 32 both use liquid crystal light valves; preferably, the response time of the second optical switch 37 is set to 10 milliseconds or less, and the light transmittance of the second optical switch 37 is set to a range of more than 90%.
It is understood that in other embodiments, the second optical switch 37 may also be an electro-optical switch, a thermo-optical switch, an acousto-optical switch, a micro-mechanical optical switch, or other types of optical switch elements such as a conventional mechanical optical switch, as long as the type of optical switch elements can achieve polarization direction adjustment; the response time and the transmittance of the second optical switch 37 can be selected according to actual working conditions, for example, the response time of the second optical switch 37 is set to be more than 10 milliseconds, and the transmittance of the second optical switch 37 is set to be less than 90%.
The eyepiece unit 20 in the augmented reality display assembly 100 further includes a second phase retarder 22 and a mirror 21, the mirror 21 in the eyepiece unit 20 employs a polarizing reflector, and the second phase retarder 22 is located between the polarizing reflector and the optical coupler 23. The second phase retarder 22 has a phase retardation of pi/4, which is used to retard the phase of linearly polarized light; the optical coupler 23 is used to reflect linearly polarized light, and the polarizing reflector is used to selectively reflect or transmit polarized light, which is capable of allowing polarized light perpendicular to the original polarization direction to transmit, and reflecting polarized light of the other polarization direction.
The display principle of the higher brightness of the lower augmented reality display assembly 100 is explained as follows:
the first optical switch 32 and the second optical switch 37 are in the same working state, when the first optical switch 32 and the second optical switch 37 are both in the closed state, the linearly polarized light polarized by the first polarizer 31 cannot be changed in polarization direction by the first optical switch 32 and the second optical switch 37, and is reflected when being projected onto the polarization reflector, so that the linearly polarized light passes through the second phase retarder 22 and realizes the phase delay of pi/4; the linearly polarized light is reflected by the optical coupler 23 after achieving the phase delay of pi/4, passes through the second phase retarder 22 again and achieves the phase delay of pi/4 again; linearly polarized light realizes pi/2 phase delay after being subjected to pi/4 phase delay superposition twice, and at the moment, the linearly polarized light is converted into linearly polarized light vertical to the original vibration direction, so that the linearly polarized light transmits through the polarization reflector and forms an image in human eyes;
when the first optical switch 32 and the second optical switch 37 are both in an on state, the linearly polarized light polarized by the first polarizer 31 returns to the polarization direction of the linearly polarized light after passing through the first optical switch 32 and the second optical switch 37 for polarization conversion twice, and is reflected when being projected onto the polarization reflector, so as to pass through the second phase retarder 22 and realize the phase delay of pi/4; the linearly polarized light is reflected by the optical coupler 23 after achieving the phase delay of pi/4, passes through the second phase retarder 22 again and achieves the phase delay of pi/4 again; the linearly polarized light realizes the phase delay of pi/2 after being subjected to the phase delay superposition of pi/4 twice, and the linearly polarized light is converted into the linearly polarized light vertical to the original vibration direction at the moment, so that the linearly polarized light transmits through the polarization reflector and is imaged in human eyes.
The utility model provides an augmented reality display module 100 utilizes first polarizer 31, first photoswitch 32 and second photoswitch 37, and second phase delay 22 and optical coupler 23 have changed the polarized light type that is used for the formation of image, and the luminance of the image display of improvement can improve 4 times levels to traditional display image luminance in theory, has higher using value and extensive application prospect.
Further, considering that the optical rotation capabilities of the first optical switch 32 and the second optical switch 37 are limited, the first optical switch 32 and the second optical switch 37 do not have enough capabilities to completely convert the linearly polarized light into the initial state after twice conversion, so that the optical signal output by the second optical switch 37 simultaneously has two linearly polarized lights with different polarization directions, which may cause the contrast of the image display to be reduced; to this end, the augmented reality display module 100 in the present embodiment further provides a second polarizer 38 in the refraction unit 30, the second polarizer 38 being located between the second optical switch 37 and the projection unit 34.
The second polarizer 38 plays a role of polarizing again, so that the second optical switch 37 filters out linearly polarized light with an excessive polarization direction capable of being completely converted, and only linearly polarized light with the same polarization direction as the initial polarization direction is left, thereby ensuring the contrast of image display.
Further, the first polarizer 31 employs a polarizing plate; and/or the presence of a catalyst in the reaction mixture,
the second polarizer 38 also employs a polarizing plate.
The polarizing ability of the polarizing film is stable, so that the polarizing function of the whole assembly is facilitated to be realized, and the polarizing film has great advantage in cost performance.
It is understood that in other embodiments, the phase delay of the second retarder 22 may be different from pi/4, as long as the sum of the accumulated phase delays of the front and back of the second retarder 22 is pi/2.
The utility model also provides an augmented reality display device (not shown), this augmented reality display device includes wearable equipment body (not shown) and sets up augmented reality display module 100 on this equipment body. The utility model provides an augmented reality display device is through using augmented reality display module 100 for self image mode when realizing many depth of field image display is unanimous, can keep under high-quality spherical mirror image mode
The utility model discloses utilize first birefringent crystal 33, second birefringent crystal 35 and set up first phase delay ware 36 between first birefringent crystal 33, second birefringent crystal 35 and realize the "spherical imaging" image output mode of many depth of field, can ensure that the quality of image output maintains under this high quality output mode of "spherical imaging", the image distortion is few, the imaging definition improves, has extensive application prospect and high economic value.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.
Claims (10)
1. An augmented reality display module, includes image element, eyepiece unit and set up in refraction unit between image element and the eyepiece unit, refraction unit includes first optical switch and first birefringent crystal, first optical switch is located between image element and the first birefringent crystal, its characterized in that, refraction unit still includes second birefringent crystal and first phase delay ware, the phase delay of first phase delay ware is pi/2 and set up in between first birefringent crystal and the second birefringent crystal.
2. The augmented reality display assembly of claim 1, wherein the refraction unit further comprises a first polarizer disposed between the image unit and a first light switch; the polarization direction of linearly polarized light output by the first polarizer is named as a first direction, the direction perpendicular to the first direction is named as a second direction, the crystal optical axis of the first birefringent crystal is perpendicular to the second direction, and the crystal optical axis of the second birefringent crystal is perpendicular to the first direction.
3. The augmented reality display assembly of claim 2, wherein the crystal optic axis of the first birefringent crystal is perpendicular to the second direction and forms an angle of 45 ° with the first direction; the crystal optical axis of the second birefringent crystal is perpendicular to the first direction and forms an included angle of 45 degrees with the second direction.
4. The augmented reality display assembly of claim 2, wherein the refraction unit further comprises a second optical switch, the eyepiece unit comprising a polarizing reflector, a second phase retarder disposed between the second birefringent crystal and the polarizing reflector, and an optical coupler, the second phase retarder disposed between the polarizing reflector and the optical coupler and delaying a phase of polarized light transmitted between the polarizing reflector and the optical coupler.
5. The augmented reality display assembly of claim 4, wherein the phase retarder has a phase retardation of pi/4.
6. The augmented reality display assembly of claim 4, wherein the refraction unit further comprises a second polarizer disposed between the second optical switch and a polarizing reflector.
7. The augmented reality display assembly of claim 6, wherein the first polarizer is a polarizer; and/or the presence of a catalyst in the reaction mixture,
the second polarizer is a polarizing plate.
8. The augmented reality display assembly of claim 1, wherein the brightness of the image cell is 5000 nits or more; and/or the presence of a catalyst in the reaction mixture,
the refresh rate of the picture cells is above 120 Hz.
9. The augmented reality display assembly of claim 1, wherein the response time of the light switch is less than 10 milliseconds; and/or the presence of a catalyst in the reaction mixture,
the light transmittance of the optical switch is greater than 90%.
10. An augmented reality display device comprising an augmented reality display assembly, wherein the augmented reality display assembly is the augmented reality display assembly of any one of claims 1 to 9.
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| CN112014970B (en) * | 2019-05-31 | 2024-10-11 | 杭州光粒科技有限公司 | Augmented reality display assembly and augmented reality display device having the same |
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