Augmented reality device

Abstract

The application discloses an augmented reality device and belongs to the technical field of display. The augmented reality device comprises an adjusting assembly, a display assembly, a prism assembly and a lens assembly, wherein the prism assembly comprises a polarization reflection film and a first prism, and the lens assembly comprises a first lens, a quarter wavelength phase film and a half-reflection half-transmission film. The first lens is driven by the adjusting assembly to move back and forth along the optical axis of the first lens, so as to change the distance between the first lens and the first prism, thereby the refractive power of the augmented reality device can be adjusted, that is, the effect of correcting myopia or hyperopia of a viewer can be realized, the requirement of different viewers on the refractive power of the augmented reality device is met, and the adaptability of the augmented reality device can be improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to an augmented reality device. Background Technology

[0002] Currently, with the development of augmented reality technology, the forms and types of augmented reality devices are becoming increasingly diverse, and their application fields are becoming increasingly widespread. Augmented Reality (AR) is a new technology that integrates real-world and virtual-world information. It applies virtual information to the real world, where real environments and virtual objects are superimposed in the same scene or space in real time, coexisting and being perceived by human senses, thus achieving a sensory experience that transcends reality.

[0003] An augmented reality device includes multiple lenses, a display component, and a housing, wherein the multiple lenses and the display component are fixedly connected to the housing.

[0004] The aforementioned augmented reality devices have low compatibility. Summary of the Invention

[0005] This application provides an augmented reality device, the technical solution of which is as follows:

[0006] The augmented reality device includes: an adjustment component and a display component, a prism component, and a lens component arranged sequentially along the optical path;

[0007] The display component is used to emit image beams;

[0008] The prism assembly includes a polarizing reflective film and a first prism. The first prism has a first surface, a second surface, and a third surface. The display component is located outside the first surface, and the lens assembly is located outside the third surface. The polarizing reflective film is attached to the second surface. The prism assembly is used to receive an image beam from the display component that enters the first prism through the first surface, and guide the image beam to the second surface. Then, at least a portion of the image beam is reflected to the third surface through the polarizing reflective film outside the second surface, and passes through the third surface to be directed toward the lens assembly.

[0009] The lens assembly includes a first lens, a quarter-wavelength phase film, and a semi-reflective film. The first lens is located outside the third surface of the first prism. The semi-reflective film is attached to the side of the first lens away from the third surface. The quarter-wavelength phase film is located on the side of the semi-reflective film closer to the third surface. The first lens is mounted on the adjustment assembly, which is used to move the first lens along the optical axis of the first lens.

[0010] Optionally, the augmented reality device further includes a housing, in which the adjustment assembly is fixedly installed, and in which the prism assembly is fixedly installed.

[0011] Optionally, the quarter-wavelength phase film is attached to the side of the first prism closest to the third surface.

[0012] Optionally, the first lens is a convex lens, the side of the first lens closest to the third surface is a plane, and the side of the first lens furthest from the third surface is a convex aspherical surface.

[0013] Optionally, the lens assembly further includes a second lens located on the side of the first lens away from the prism assembly. The second lens is a concave lens, with the convex surface of the first lens facing the second lens and the concave surface of the second lens facing the first lens.

[0014] The second lens is bonded to the side of the semi-reflective and semi-transparent film away from the first lens.

[0015] Optionally, the second lens includes a liquid lens and a first electronic control component, wherein the liquid lens is mounted on the first electronic control component, and the first electronic control component is used to control the diopter of the liquid lens.

[0016] Optionally, the second lens includes an electrochromic lens and a second electronic control component, wherein the electrochromic lens is mounted on the second electronic control component, and the second electronic control component is used to control the electrochromic lens to change color.

[0017] Optionally, the first prism further includes a fourth facet. The first prism is formed by the first facet, the second facet, the third facet, and the fourth facet. The first prism is used to cause an image beam incident from the first facet to be totally reflected by the fourth facet and the third facet in sequence, and then directed toward the second facet.

[0018] Optionally, the augmented reality device further includes a polarizer assembly that is attached to the fourth surface of the first prism;

[0019] The polarizer assembly includes a first polarizer and a second polarizer, wherein the polarization directions of the first polarizer and the second polarizer are perpendicular.

[0020] Optionally, the prism assembly further includes a second prism having a fifth facet and a sixth facet, the fifth facet being bonded to the side of the polarizing reflective film away from the first prism, and the sixth facet being parallel to the third facet of the first prism;

[0021] The fourth face of the first prism is parallel to the third face.

[0022] Optionally, the third surface of the first prism is perpendicular to the optical axis of the first lens, the dimension between the third and fourth surfaces of the first lens ranges from 4 mm to 5.5 mm, and the center thickness of the first lens ranges from 1 mm to 2.5 mm.

[0023] Optionally, the distance between the first lens and the first prism is in the range of 0.1 mm to 1.5 mm.

[0024] The beneficial effects of the technical solutions provided in this application include at least the following:

[0025] An augmented reality device is provided, comprising: an adjustment component, a display component, a prism component, and a lens component. The prism component includes a polarizing reflective film and a first prism, and the lens component includes a first lens, a quarter-wavelength phase film, and a semi-reflective film. The augmented reality device adjusts the refractive power of the first lens by moving it back and forth along the optical axis of the first lens through the adjustment component, thereby changing the distance between the first lens and the first prism. This allows for adjustment of the device's refractive power, enabling the correction of nearsightedness or farsightedness in viewers, meeting the refractive power requirements of different viewers, and thus improving the device's adaptability.

[0026] In addition, through the combination of phase film, polarization reflective film and semi-reflective film, the augmented reality device can make the image light emitted by the display component reflect and refract multiple times between multiple prism components and lens components, so that the prism components and lens components can adjust the image beam emitted by the display component, thus ensuring the display effect of the augmented reality device. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram illustrating an application scenario of the augmented reality device provided in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the structure of an augmented reality device provided in an embodiment of this application;

[0030] Figure 3 yes Figure 2 A schematic diagram showing one possible position of the first lens and the first prism in the augmented reality device shown;

[0031] Figure 4 yes Figure 2 A schematic diagram showing another position of the first lens and the first prism in the augmented reality device shown;

[0032] Figure 5 This is a schematic diagram of another augmented reality device provided in the embodiments of this application;

[0033] Figure 6 This is a schematic diagram of a modulation transfer function curve provided in an embodiment of this application;

[0034] Figure 7 This is another schematic diagram of the modulation transfer function curve provided in the embodiments of this application;

[0035] Figure 8 This is a schematic diagram of the shape change of a liquid lens provided in an embodiment of this application.

[0036] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0038] Augmented reality devices can include head-mounted augmented reality displays, also known as augmented reality displays. Augmented reality technology overlays information that is difficult to experience in the real world onto the user's real-world field of view using computer-generated content based on computer and other scientific technologies. This simulates the process and can create an immersive augmented environment for the user. After the real environment and virtual objects overlap, they can coexist in the same scene and space.

[0039] An augmented reality device includes a display component, a prism component, a lens component, and a housing. The display component, prism component, and lens component are all fixedly connected to the housing. The augmented reality device cannot adjust the diopter.

[0040] The aforementioned augmented reality device will be used by different viewers, but different viewers may have different vision conditions. For example, if a viewer is nearsighted, they need to wear the augmented reality device while wearing their glasses, which will result in a poor viewing experience and thus low compatibility of the augmented reality device.

[0041] Furthermore, since augmented reality devices have an output port facing the viewer and an input port facing the external environment, during the transmission of the image beam emitted by the display components through the various optical elements in the augmented reality device, some of the image beam may enter the outside world through the input port or exit from the side where the output port is located, without entering the viewer's eyes. This would make it easier for the viewer's viewing content to be obtained by the outside world, resulting in the problem of privacy leakage for the viewer.

[0042] The augmented reality device provided in this application can solve the problems existing in the above-mentioned related technologies.

[0043] Figure 1 This is a schematic diagram illustrating an application scenario of the augmented reality device provided in this application embodiment. Please refer to it. Figure 1 The application scenario may include a viewer 20, an augmented reality device 10, and a data source 30. The augmented reality device 10 may be a head-mounted augmented reality display with a light outlet, and the viewer 20's eyes may be located on one side of the light outlet of the head-mounted augmented reality display.

[0044] Data source 30 can be a processor. Data source 30 can be located inside or outside the augmented reality device 10, that is, it can be a centralized data source for multiple augmented reality devices 10 in a location. Data source 30 and augmented reality device 10 can be connected via wired or wireless means. Data source 30 is used to provide image data to augmented reality device 10. Augmented reality device 10 displays the image image corresponding to the image data, processes the image image, and projects the image beam towards viewer 20. At the same time, viewer 20 can also obtain the scene of the external environment 40 (such as trees and other objects) through augmented reality device 10. The real environment and virtual objects are superimposed on the same screen or space in real time and exist simultaneously.

[0045] Figure 2 This is a schematic diagram of the structure of an augmented reality device provided in an embodiment of this application. Figure 3 yes Figure 2 The diagram shows one possible position of the first lens and the first prism in the augmented reality device. Figure 4 yes Figure 2 This is a schematic diagram showing another possible position of the first lens and the first prism in the augmented reality device. Please refer to... Figure 2 , Figure 3 and Figure 4 The augmented reality device 10 may include: an adjustment component 11 and a display component 12, a prism component 13 and a lens component 14 arranged sequentially along the optical path.

[0046] The display component 12 can be used to emit an image beam S1, and the prism component 13 can include a polarizing reflective film 131 and a first prism 132. The first prism 132 can have a first surface D1, a second surface D2 and a third surface D3.

[0047] The display assembly 12 can be located outside the first surface D1 of the first prism 132, the lens assembly 14 can be located outside the third surface D3 of the first prism 132, and the polarizing reflective film 131 can be attached to the second surface D2 of the first prism 132. The display assembly 11 can emit an image beam S1, and the prism assembly 13 can be used to receive the image beam S1 emitted by the display assembly 12 into the first prism 132 through the first surface D1, guide the image beam S1 to the second surface D2 of the first prism 132, and then reflect at least part of the image beam S1 to the third surface D3 of the first prism 132 through the polarizing reflective film 131 outside the second surface D2 of the first prism 132, and then direct it to the lens assembly 14 through the third surface D3 of the first prism 132.

[0048] The polarizing reflective film 131 can be applied by pasting or by coating. The polarizing reflective film 131, also called a polarizing beam splitter, can be used for polarization beam splitting. That is, it can transmit a portion of a beam with a first polarization direction and reflect a portion with a second polarization direction, where the first and second polarization directions are different. For example, the polarizing reflective film 131 can reflect S-polarized light and transmit P-polarized light. The S-polarized light reflected by the polarizing reflective film 131 can illuminate and pass through the third surface D3 of the first prism 132.

[0049] The lens assembly 14 may include a first lens 141, a quarter-wavelength phase film 142, and a semi-reflective film 143. The first lens 141 may be located outside the third surface D3 of the first prism 132, the semi-reflective film 143 may be attached to the side of the first lens 141 away from the third surface D3 of the first prism 132, and the quarter-wavelength phase film 142 may be located on the side of the semi-reflective film 143 close to the third surface D3 of the first prism 132.

[0050] The semi-reflective membrane 143 can transmit a portion of the image beam that is irradiated to the semi-reflective membrane 143 and reflect a portion of the image beam that is irradiated to the semi-reflective membrane 143. For example, the semi-reflective membrane 143 can transmit 50% of the image beam that is irradiated to the semi-reflective membrane 143 and reflect 50% of the image beam that is irradiated to the semi-reflective membrane 143. Alternatively, the semi-reflective membrane 143 can also transmit 60% of the image beam that is irradiated to the semi-reflective membrane 143 and reflect 40% of the image beam that is irradiated to the semi-reflective membrane 143. The ratio of reflection and transmission of the semi-reflective membrane 143 can be specifically set according to the parameter requirements of the augmented reality device. This application embodiment does not limit this. Furthermore, it should be noted that the semi-reflective membrane 143 does not change the polarization characteristics of the image beam S1.

[0051] The semi-reflective and semi-transparent film 143 can be directly deposited onto the third surface D3 of the first lens 141 away from the first prism 132 by vacuum deposition, so as to achieve better adhesion of the semi-reflective and semi-transparent film 143. Alternatively, the semi-reflective and semi-transparent film 143 can also be attached to the third surface D3 of the first lens 141 away from the first prism 132.

[0052] The quarter-wavelength phase film 142 can be an independent optical element, located between the polarizing reflective film 131 and the semi-reflective film 143, or disposed on the third surface D3 of the first prism 132 near the first lens 141, or disposed on one surface of the first lens 141 near the first prism 132. The quarter-wavelength phase film 142 can be disposed by adhesive bonding or by coating. The quarter-wavelength phase film 142 can convert a circularly polarized image beam into a linearly polarized image beam, or vice versa.

[0053] For example, please refer to Figure 2The schematic diagram of the optical path of the augmented reality device shown in this application embodiment illustrates that an image beam S1 emitted by component 12 is directed toward the first surface D1 of the first prism 132. The image beam S1 passes through the first surface D1 of the first prism 132 and enters the interior of the first prism 132, where at least one total internal reflection occurs. The first prism 132 guides the image beam S1 after total internal reflection to the second surface D2. A polarizing reflective film 131 located outside the second surface D2 of the first prism 132 receives the image beam S1 that has passed through the second surface D2 of the first prism 132 and reflects at least a portion of the image beam S1 to the third surface D3 of the first prism 132. The polarization direction of this at least portion of the image beam S1 can be the same, which can be referred to as linearly polarized light. The third surface D3 of the first prism 132 transmits the received image beam S1 with a linear polarization state and guides the image beam S1 to a quarter-wavelength phase film 142. The quarter-wavelength phase film 142 receives the image beam S1 and transmits the image beam S1. The polarization state of image beam S1 changes from linear polarization to circular polarization. The circularly polarized image beam S1 is directed toward the semi-reflective membrane 143. The semi-reflective membrane 143 causes a portion of the image beam S1 to be reflected and another portion to be transmitted. That is, a portion of the image beam S1 is reflected back to the quarter-wavelength phase membrane 142 by the semi-reflective membrane 143. The quarter-wavelength phase membrane 142 transmits the circularly polarized image beam S1 again, and the polarization state of the image beam S1 changes to linear polarization. The linearly polarized image beam S1 is then directed to the third surface D3 of the first prism 132. The third surface D3 of the first prism 132 transmits the image beam S1 again and directs it to the second surface D2 of the first prism 132. The second surface D2 of the first prism 132 transmits the image beam S1 again to the polarizing reflective membrane 131 (at this time, the polarization direction of the image beam S1 is different from the polarization state when it first irradiates the polarizing reflective membrane 131). At least a portion of the image beam S1 is transmitted through the polarizing reflective membrane 131 to the viewer 20.

[0054] The first lens 141 can be mounted on the adjustment assembly 11, which can be used to drive the first lens 141 to move along the optical axis g1 of the first lens 141.

[0055] Because different viewers 20 have different visual acuity, some viewers 20 are nearsighted or farsighted. At the preset eye position of the viewer 20, nearsighted or farsighted viewers will not be able to see a clear display image. The distance between the first lens 141 and the first prism 132 is a variable distance, and the diopter of the augmented reality device 10 can be changed by changing the distance between the first lens 141 and the first prism 132.

[0056] For example, please refer to Figure 3 When the first lens 141 is located Figure 3 At the indicated position, the distance (which can also be considered as an air gap) between the first lens 141 and the third surface D3 of the first prism 132 is 0.35 mm. At this point, the virtual image distance of the augmented reality device 10 is 0.15 m. The virtual image distance can refer to the distance from the viewer's eye 20 to the virtual image formed by the beam emitted by the augmented reality device 10 through the adjusted display component 11. Please refer to... Figure 4 When the first lens 141 is located Figure 4 At the position shown, the distance (which can also be considered as an air gap) between the first lens 141 and the third surface D3 of the first prism 132 is 1.37 mm. At this time, the virtual image distance of the augmented reality device 10 is 2 meters, and the augmented reality device 10 can meet the myopia adjustment range of 50 degrees to 700 degrees.

[0057] That is, the distance between the first lens 141 and the first prism 132 can be changed by adjusting the component 11, thereby adjusting the diopter of the augmented reality device 10, which can achieve the effect of correcting the viewer's myopia or hyperopia.

[0058] In summary, this application provides an augmented reality device, including: an adjustment component, a display component, a prism component, and a lens component. The prism component includes a polarizing reflective film and a first prism, and the lens component includes a first lens, a quarter-wavelength phase film, and a semi-reflective film. This augmented reality device uses the adjustment component to move the first lens back and forth along its optical axis, changing the distance between the first lens and the first prism. This allows for adjustment of the refractive power of the augmented reality device, enabling the correction of nearsightedness or farsightedness in viewers, meeting the refractive power requirements of different viewers, and thus improving the adaptability of the augmented reality device.

[0059] In addition, through the combination of phase film, polarization reflective film and semi-reflective film, the augmented reality device can make the image light emitted by the display component reflect and refract multiple times between multiple prism components and lens components, so that the prism components and lens components can adjust the image beam emitted by the display component, thus ensuring the display effect of the augmented reality device.

[0060] Optionally, such as Figure 5 As shown, Figure 5This is a schematic diagram of another augmented reality device provided in this application embodiment. The augmented reality device 10 may further include a housing 15, an adjustment component 11 may be fixedly installed in the housing 15, and a prism component 13 may also be fixedly installed in the housing 15. The housing 15 may also be a support to make the augmented reality device 10 more portable. The adjustment component 11 may drive the first lens 141 to move away from the prism component 13, and the adjustment component 11 may also drive the first lens 141 to move closer to the prism component 13 to adjust the diopter of the augmented reality device 10. In this way, the diopter of the augmented reality device 10 can be changed by adjusting one of the multiple optical elements, making the adjustment method of the diopter of the augmented reality device 10 relatively simple.

[0061] For example, an adjustment knob can be provided on the housing 15. This adjustment knob can be movably connected to the adjustment component 12. The adjustment knob can be manually rotated to move the adjustment component 12, thereby moving the first lens 141 along its own optical axis between the display component 12 and the doublet lens 13, thus achieving adjustment of the position of the first lens 141. During the movement of the first lens 141, the focusing position of the image beam emitted by the display component 12 can change, thereby allowing adjustment of the focusing position of the image beam according to the viewer's vision.

[0062] Alternatively, the adjustment knob can be an electric knob connected to other detection electrical components on the augmented reality device 10, which can automatically adjust the position of the first lens 141 according to the viewer 20's vision, so that the viewer 20 can have a better viewing experience.

[0063] like Figure 6 and Figure 7 As shown, Figure 6 This is a schematic diagram of a modulation transfer function curve provided in an embodiment of this application. Figure 7 This is another schematic diagram of a modulation transfer function curve provided in an embodiment of this application. The horizontal axis represents the number of line pairs per millimeter in space, and the vertical axis represents the modulation transfer function. The modulation transfer function curve (MTF) refers to the relationship between modulation density and the number of line pairs per millimeter in an image, and is used to evaluate the ability of optical elements to reproduce details of a scene.

[0064] Figure 6 The modulation transfer function curve in the middle can correspond to Figure 3 When the distance between the first lens 141 and the third surface D3 of the first prism 132 is 0.35 mm, the optical performance of the augmented reality device 10 is such that the MTF value of the augmented reality device 10 is greater than 0.5, that is, at a frequency of 30 line pairs / mm, the MTF value is greater than 0.5. Figure 7 The modulation transfer function curve in the middle can correspond to Figure 4 When the distance between the first lens 141 and the third surface D3 of the first prism 132 is 1.37 mm, the optical performance of the augmented reality device 10 is as follows: At this time, the MTF value of the augmented reality device 10 is greater than 0.3, that is, at a frequency of 30 line pairs / mm, the MTF value is greater than 0.3. Therefore, it can be concluded that the imaging quality of the augmented reality device 10 is good.

[0065] Optionally, such as Figure 2 or Figure 5 As shown, the quarter-wavelength phase film 142 can be attached to the side of the first prism 132 near the third surface D3. The quarter-wavelength phase film 142 can be disposed in either an adhesive or a coated manner.

[0066] Optionally, the first lens 141 can be a convex lens, the side of the first lens 141 closest to the third surface D3 can be a plane, and the side of the first lens 141 furthest from the third surface D3 can be a convex aspherical surface.

[0067] The first lens 141 can be made of glass, which can effectively control stress birefringence and dispersion, improving optical performance. Glass also has better optical refractive and reflective properties. Stress birefringence is also known as photoelasticity. Under pressure or tension, the refractive index of a transparent isotropic medium changes, making the optical properties of the lens anisotropic and non-uniform, which in turn causes wavefront aberration or polarization error. The first lens 141 can also be made of plastic (exemplarily, COC plastic). Plastic has good plasticity and can be injection molded as needed, thus making the manufacturing difficulty of the first lens 141 lower.

[0068] The first lens 141 can converge the image beam S1 emitted from the prism assembly 13. The convex aspherical surface of the first lens 141 can adjust the focusing position and emission angle of the image beam S1, so that the image beam S1 emitted from the display assembly 11 can enter the eyes of the viewer 20 at a preset angle. This can avoid the problems of image beam distortion and field curvature, thereby avoiding image distortion entering the eyes of the viewer 20 and reducing the dizziness of the viewer 20 when using the augmented reality device.

[0069] Furthermore, when the side of the first lens 141 closest to the third surface D3 is a plane, on the one hand, the difficulty of attaching the quarter-wavelength phase film 142 to the plane can be reduced, and on the other hand, the size of the first lens 141 in the direction of the optical axis g1 of the first lens 12 can be reduced.

[0070] Optionally, such as Figure 5As shown, the lens assembly 14 may further include a second lens 144, which may be located on the side of the first lens 141 away from the prism assembly 13. The second lens 144 may be a concave lens, with the convex surface of the first lens 141 facing the second lens 144 and the concave surface of the second lens 144 facing the first lens 141. The second lens 144 may be cemented to the side of the semi-reflective and semi-transparent film 143 away from the first lens 141. That is, the second lens 144, the semi-reflective and semi-transparent film 143, the first lens 141, and the quarter-wavelength phase film 142 are cemented together in pairs in sequence.

[0071] Since the augmented reality device 10 can also be used to transmit the external light beam S2 to the eyes of the viewer 20, the first lens 141 may change the characteristics of the light entering the eyes of the viewer 20 through the external light beam S2. The second lens 144 can be complementary in shape to the first lens 141 to compensate for the change of the external light beam by the first lens 141, thereby avoiding the problem of distortion of the external light beam S2, and thus avoiding the distortion of the external scene entering the eyes of the viewer 20, which can reduce the dizziness of the viewer 20 when using the augmented reality device.

[0072] Optionally, such as Figure 8 As shown, Figure 8 This is a schematic diagram of the shape change of a liquid lens provided in an embodiment of this application. The second lens 144 may include a liquid lens 1441 and a first electronic control component. The liquid lens 1441 may be mounted on the first electronic control component so that the liquid lens 1441 is electrically connected to the first electronic control component. The first electronic control component can be used to control the refractive power of the liquid lens 1441.

[0073] The liquid lens 1441 may have a cavity 14411 and a liquid 14412 located within the cavity 14411. The liquid 14411 can adjust its shape according to the voltage value of the first electronic control component. The cavity 14411 can be an elastic cavity, and the cavity 14411 can change its shape according to the shape of the internal liquid 14412 to adjust the refractive power of the liquid lens 1441. For example, Figure 8 As shown, the liquid lens 1441 can be deformed into convex or concave lenses with different diopter powers. In this embodiment, the distance between the first lens 141 and the first prism 132 can be adjusted to meet the diopter requirements of people with different diopter powers for the virtual image corresponding to the image beam S1 emitted by the display component 12. The liquid lens 1441 can be adjusted to be a convex or concave lens so that the liquid lens 1441 and the first lens 141 work together to adjust the diopter of the external image corresponding to the external beam S2 by the augmented reality device 10, thereby enabling people with myopia or hyperopia to see both the virtual image and the external image clearly.

[0074] Optionally, the second lens 144 may include an electrochromic lens and a second electronic control component. The electrochromic lens may be mounted on the second electronic control component so that the electrochromic lens and the second electronic control component are electrically connected. The second electronic control component can be used to control the color change of the electrochromic lens. That is, the electrochromic lens has a color rendering mode, and the second lens 144 is used to absorb light in the color rendering mode. For example, when the viewer 20 is in a bright sunlight environment, the color of the second lens 144 can be dark gray. The electrochromic lens can play the following two roles: on the one hand, the electrochromic lens can absorb the imaging beam S1 to avoid the viewer's privacy being leaked; on the other hand, the electrochromic lens can absorb the external light beam S2 to improve the contrast of the imaging beam S1, which can avoid the phenomenon that the display image formed by the imaging beam received by the viewer 20 is unclear due to the high brightness of the external light beam S2.

[0075] Optionally, the first prism 132 may further include a fourth surface D4. The first prism 132 is formed by the first surface D1, the second surface D2, the third surface D3, and the fourth surface D4. The first prism 132 can be used to cause the image beam S1 incident from the first surface D1 to undergo total internal reflection at the fourth surface D4 and the third surface D3 in sequence before being directed towards the second surface D2. In this way, the image beam S1 can undergo total internal reflection through multiple surfaces of the first prism 132, thereby increasing the optical path length of the image beam S1 and causing the image beam S1 to diffuse. This facilitates the optimization of aberrations in subsequent optical elements, resulting in better imaging performance of the augmented reality device 10.

[0076] The included angle between the first face D1 and the fourth face D4 of the first prism 132 can be in the range of 45° to 60°, and the included angle between the second face D2 and the third face D3 of the first prism 132 can be in the range of 20° to 30°.

[0077] Optionally, such as Figure 5 As shown, the augmented reality device 10 may further include a polarizer assembly 16, which may be located outside the fourth face D4 of the first prism 132. The side of the polarizer assembly 16 facing the first prism 132 may be parallel to the fourth face D4 of the first prism 132. An air gap exists between the polarizer assembly 16 and the fourth face D4 of the first prism 132.

[0078] The polarizer assembly 16 may include a first polarizer 161 and a second polarizer 162, with the polarization directions of the first polarizer 161 and the second polarizer 162 perpendicular. The second polarizer 162 may be located on the side of the first polarizer 161 away from the first prism 132. Since a portion of the image beam S1 may be transmitted through the fourth surface D4 of the first prism 132 when total internal reflection occurs on the fourth surface D4, this portion of the transmitted image beam may not enter the viewer 20's eye, potentially allowing external access to the viewer's viewing content. Therefore, the polarizer assembly 16 can receive the beam at the same position as the image beam S1 undergoing total internal reflection on the fourth surface D4 of the first prism 132. This prevents the image beam from being transmitted through the fourth surface D4 of the first prism 132, thus avoiding the problem of viewer privacy being compromised. Furthermore, the size of the polarizer assembly 16 on the plane parallel to the fourth surface D4 of the first prism 132 can be smaller than the size of the fourth surface D4 of the first prism 132, so as to avoid the polarizer assembly 16 blocking the light beam that needs to be incident on the eyes of the viewer 20.

[0079] Alternatively, the polarizer assembly 16 can be bonded to the fourth surface D4 of the first prism 132 by applying adhesive to the periphery or sides of the optical path, so that there is an air gap between the polarizer assembly 16 and the fourth surface D4 of the first prism 132 in the area where an image beam may pass.

[0080] In an optional embodiment, the augmented reality device may further include a light-blocking plate located outside the fourth facet of the first prism. The light-blocking plate may be made of an opaque material or a dark-colored light-absorbing material. The light-blocking plate may be bonded to the fourth facet D4 of the first prism 132 by applying adhesive to the periphery or sides of the optical path, creating an air gap between the light-blocking plate and the fourth facet D4 in areas where an image beam may pass. This prevents the image beam from penetrating the fourth facet D4 of the first prism 132, thus avoiding the problem of viewer privacy being compromised.

[0081] Optionally, such as Figure 5 As shown, the prism assembly 13 may further include a second prism 133, which has a fifth face D5 and a sixth face D6. The fifth face D5 is bonded to the side of the polarizing reflective film 131 away from the first prism 132, and the sixth face D6 is parallel to the third face D3 of the first prism 132. The fourth face D4 of the first prism 132 is parallel to the third face D3. Thus, the second prism 133 can be used to compensate for aberrations in the beam emitted from the second face D2 of the first prism 132. Furthermore, the second prism 133 can also make the shape of the prism assembly 13 more regular, facilitating assembly of the prism assembly 13.

[0082] In an optional embodiment, the fourth face D4 of the first prism 132 and the sixth face D6 of the second prism 133 can also be aspherical. Thus, the first prism 132 can be used to direct the image beam S1 incident from the first face D1 to the second face D2 after total internal reflection at the third face D3. The fourth face D4 of the first prism 132 and the sixth face D6 of the second prism 133 can be used to adjust the aberrations between the image beam S1 and the external beam S2 in the augmented reality device 10.

[0083] The third surface D3 of the first prism 132 is perpendicular to the optical axis g1 of the first lens 132. The size between the third surface D3 and the fourth surface D4 of the first prism 132 is 4 mm to 5.5 mm, that is, the thickness of the first prism 132 can be 4 mm to 5.5 mm.

[0084] The center thickness of the first lens 141 ranges from 1 mm to 2.5 mm, and the center thickness of the second lens 144 ranges from 0.4 mm to 0.6 mm.

[0085] The aspherical radius of the convex surface of the first lens 141, away from the prism assembly 13, ranges from 40 mm to 60 mm, and the aspherical radius of the concave surface of the second lens 144, close to the prism assembly 13, also ranges from 40 mm to 60 mm. It should be noted that the aspherical radius of the convex surface refers to the radius of curvature at the center point of the convex surface (the intersection of the optical axis of the lens and the convex surface). Similarly, the aspherical radius of the concave surface refers to the radius of curvature at the center point of the concave surface (the intersection of the optical axis of the lens and the convex surface).

[0086] The first lens 141 has a focal length range of 10–20 mm, a refractive index range of 1.5–1.6, and a dispersion coefficient range of 50–60; the second lens 144 has an optical power range of -10–-20 mm, a refractive index range of 1.5–1.6, and a dispersion coefficient range of 50–60. By setting the parameters of multiple optical lenses within the above ranges, the viewer 20 can obtain a relatively clear display image.

[0087] Optionally, the distance between the first lens 141 and the first prism 132 can be in the range of 0.1 mm to 1.5 mm. In this way, when the position of the first lens 141 relative to the first prism 132 is adjusted, the influence on the size of the entire augmented reality device 10 in the direction of the optical axis of the first lens 141 is small, and at the same time, the sensitivity of adjusting the diopter of the augmented reality device 10 can be high.

[0088] In summary, this application provides an augmented reality device, including: an adjustment component, a display component, a prism component, and a lens component. The prism component includes a polarizing reflective film and a first prism, and the lens component includes a first lens, a quarter-wavelength phase film, and a semi-reflective film. This augmented reality device uses the adjustment component to move the first lens back and forth along its optical axis, changing the distance between the first lens and the first prism. This allows for adjustment of the refractive power of the augmented reality device, enabling the correction of nearsightedness or farsightedness in viewers, meeting the refractive power requirements of different viewers, and thus improving the adaptability of the augmented reality device.

[0089] In addition, through the combination of phase film, polarization reflective film and semi-reflective film, the augmented reality device can make the image light emitted by the display component reflect and refract multiple times between multiple prism components and lens components, so that the prism components and lens components can adjust the image beam emitted by the display component, thus ensuring the display effect of the augmented reality device.

[0090] In this application, the terms “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term “multiple” means two or more, unless otherwise expressly defined.

[0091] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An augmented reality device, characterized by, The augmented reality device comprises an adjusting assembly, a display assembly, a prism assembly and a lens assembly arranged in sequence along an optical path direction; The display assembly is configured to emit an image light beam; The prism assembly comprises a polarized reflection film and a first prism having a first face, a second face and a third face, the display assembly is located outside the first face, the lens assembly is located outside the third face, the polarized reflection film is attached to the second face, the prism assembly is configured to receive the image light beam emitted by the display assembly into the first prism through the first face, guide the image light beam to the second face, reflect at least part of the image light beam to the third face through the polarized reflection film outside the second face, and transmit the image light beam through the third face to the lens assembly. The lens assembly comprises a first lens, a quarter wavelength phase film and a half mirror, the first lens is located outside the third face of the first prism, the half mirror is attached to one side of the first lens away from the third face, and the quarter wavelength phase film is located on the side of the half mirror close to the third face, the first lens is mounted on the adjusting assembly, and the adjusting assembly is configured to drive the first lens to move along the optical axis of the first lens.

2. The augmented reality device of claim 1, wherein, The augmented reality device further comprises a housing, and the adjusting assembly is fixedly installed in the housing, and the prism assembly is fixedly installed in the housing.

3. The augmented reality device of claim 1, wherein, The quarter wavelength phase film is attached to one side of the first prism close to the third face.

4. The augmented reality device of claim 1, wherein, The first lens is a convex lens, one side of the first lens close to the third face is a plane, and one side of the first lens away from the third face is a convex aspheric surface.

5. The augmented reality device of claim 4, wherein, The lens assembly further comprises a second lens, the second lens is located on one side of the first lens away from the prism assembly, the second lens is a concave lens, the convex surface of the first lens faces the second lens, and the concave surface of the second lens faces the first lens. The second lens and the half mirror are glued on one side of the half mirror away from the first lens.

6. The augmented reality device of claim 5, wherein, The second lens comprises a liquid lens and a first electric control assembly, the liquid lens is mounted on the first electric control assembly, and the first electric control assembly is configured to control the refractive power of the liquid lens.

7. The augmented reality device of claim 5, wherein, The second lens comprises an electrochromic lens and a second electric control assembly, the electrochromic lens is mounted on the second electric control assembly, and the second electric control assembly is configured to control the color change of the electrochromic lens.

8. The augmented reality device of claim 1, wherein, The first prism further comprises a fourth face, the first prism is surrounded by the first face, the second face, the third face and the fourth face, and the first prism is configured to make the image light beam incident from the first face to be totally reflected on the fourth face and the third face in sequence, and then to be incident on the second face.

9. The augmented reality device of claim 8, wherein, The augmented reality device further comprises a polarizer assembly, and the polarizer assembly is located outside the fourth face of the first prism. The polarizer assembly comprises a first polarizer and a second polarizer, and the polarization directions of the first polarizer and the second polarizer are perpendicular.

10. The augmented reality device of claim 8, wherein, The prism assembly further comprises a second prism having a fifth face and a sixth face, the fifth face being cemented to a face of the polarizing reflective film away from the first prism, the sixth face being parallel to the third face of the first prism. The fourth face of the first prism is parallel to the third face.

11. The augmented reality device of claim 10, wherein, The third face of the first prism is perpendicular to the optical axis of the first lens, the size between the third face and the fourth face of the first prism ranges from 4 mm to 5.5 mm, and the central thickness of the first lens ranges from 1 mm to 2.5 mm.

12. The augmented reality device of claim 1, wherein, The distance between the first lens and the first prism ranges from 0.1 mm to 1.5 mm.

Images