Optical device

Abstract

The present application relates to an optical device, comprising a vision correction structure and a visual convergence adjustment conflict mitigation structure. The vision correction structure is disposed between a display assembly and the visual convergence adjustment conflict mitigation structure. The vision correction structure controls the transmission distance of light within the vision correction structure through liquid crystal zooming and linear polarization conversion. The visual convergence adjustment conflict mitigation structure controls the focal length of light within the visual convergence adjustment conflict mitigation structure through liquid crystal zooming. No space is required to allow for lens displacement for mechanical structural adjustment, which helps reduce the size and weight of the optical device. The diopter adjustment for visual convergence adjustment conflict and the diopter adjustment for vision correction are comprehensively considered, which helps increase the range of diopter adjustment, giving the optical device a wider range of applicability. Actual measurements show that it can meet, but is not limited to, correcting myopia from 600 degrees to hyperopia from 100 degrees. The two functions can also be controlled separately, not limited to simultaneous use.

Description

Technical Field

[0001] The present application relates to the field of head-mounted displays, and in particular to optical devices. Background Art

[0002] Traditional head-mounted displays (HMDs), especially virtual reality (VR) displays, utilize a simple optical magnification system with a diopter greater than zero and a display. Because images must be presented as upright, magnified virtual images, according to optical imaging formulas, the human eye must be positioned within one focal length of the simple optical magnification system. Diopter, also known as brightness, is expressed in units of diopters (D). P = 1 / focal length f = (1 / object distance u) + (1 / image distance v).

[0003] However, due to the high proportion of myopia in the modern population, the normal length of the average person's eye axis is about 22 to 23mm. Usually, a 1mm increase in the eye axis compared to the normal length will produce a -3D refractive power, which means that the myopia degree increases by 300 degrees. Therefore, traditional VR glasses require mechanically adjustable lenses, allowing users to manually adjust the correction degree before using VR glasses, so that they do not need to wear glasses when using VR glasses. Based on the visual distribution of VR glasses users, the current VR glasses have a focusing range of approximately +1D to -6D for vision correction, covering the range of normal vision, presbyopia, and myopia of 600 degrees.

[0004] Vergence Accommodation Conflict (VAC) is the main source of dizziness caused by head-mounted displays. When a person is viewing an object, the human eye will simultaneously perform convergence (Vergence) and accommodation (Accommodation). The convergence effect causes the eyes to change the eye rotation angle according to the distance of the object to ensure that the object falls within the human eye's field of view, while the accommodation effect causes the human eye to adjust the thickness of the lens according to the distance of the object to ensure clear imaging. At the same time, the two effects will affect each other; therefore, when viewing artificial images, especially close-up three-dimensional artificial images, when the amplitude of the two effects is contrary to the situation during natural viewing, dizziness will occur due to the conflict. Figure 1 As shown, when viewing an image, the gaze point is adjusted to the image based on the convergence effect of vision; based on the adjustment effect of focal length, the lens adjusts the refractive power of the human eye; when the focal length adjustment does not match the visual convergence distance, a visual convergence adjustment conflict occurs; when there is eye tracking to assist focal length adjustment and / or manual focus to assist focal length adjustment, if the focal length adjustment matches the visual convergence distance, the visual convergence adjustment conflict can be alleviated.

[0005] The lens system used in traditional head-mounted displays adjusts the focal length of the lens system in real time to assist in adjusting the focus adjustment distance of the human eye, so that the focus adjustment distance of the human eye matches the visual convergence distance. The mainstream method to reduce the conflict between the two is to use zoom lens.

[0006] For example, traditional VR glasses correct vision by manually adjusting the position of the lenses within the lens assembly to achieve diopter adjustment. This practice forces users to repeatedly remove and adjust the correction power when using the VR glasses. Furthermore, space must be left in the mechanism to allow for lens displacement, making the VR glasses larger and heavier. Furthermore, using an inappropriate correction power can lead to the risk of further deterioration of vision.

[0007] Meta has proposed VR glasses that alleviate visual convergence and accommodation conflicts. By using multiple zoom liquid crystal lenses, they save mechanical zoom space and speed up zooming. However, the main purpose is to alleviate visual convergence and accommodation conflicts. This is achieved through improvements in materials and mechanical design. It does not involve changes in the diopter of visual convergence and accommodation conflicts, nor does it involve correcting vision. Summary of the Invention

[0008] Based on this, it is necessary to provide an optical device.

[0009] In one embodiment, an optical device includes a vision correction structure and a vision convergence adjustment conflict mitigation structure, wherein the vision correction structure is disposed between a display assembly and the vision convergence adjustment conflict mitigation structure;

[0010] The vision correction structure controls the transmission distance of light inside the vision correction structure by liquid crystal zoom and linear polarization conversion;

[0011] The visual convergence adjustment conflict mitigation structural component controls the focal length of light at the visual convergence adjustment conflict mitigation structural component through liquid crystal zoom.

[0012] The above-mentioned optical device, on the one hand, cooperates with the vision correction structure and the visual convergence adjustment conflict mitigation structure, and there is no need to reserve space for lens displacement and mechanical structure adjustment, which is beneficial to reducing the volume and weight of the optical device; on the other hand, it comprehensively considers the diopter adjustment of the visual convergence adjustment conflict and the diopter adjustment of the vision correction, which is beneficial to improving the range of diopter adjustment, so that the optical device has a wider range of application. According to actual measurements, it can meet but is not limited to correcting myopia from 600 degrees to hyperopia from 100 degrees; on the other hand, the diopter adjustment of the visual convergence adjustment conflict and the diopter adjustment of the vision correction can be controlled separately, and is not limited to the simultaneous use of the two functions.

[0013] In one embodiment, the vision correction structure adjusts the liquid crystal zoom mode and the linear polarization conversion mode respectively through an electric control method, and the visual amplitude adjustment conflict mitigation structure adjusts the liquid crystal zoom mode through an electric control method.

[0014] In one embodiment, the visual convergence adjustment conflict mitigation structure includes a second liquid crystal variable focus aspheric lens.

[0015] In one embodiment, the vision correction structure includes a semi-transmissive reflective coating, a quarter-wave plate, a third lens, a first liquid crystal variable focus aspheric lens, a linear polarization converter, and a polarized reflective coating arranged in sequence;

[0016] The quarter wave plate is disposed adjacent to the display component, and the semi-transmissive reflective coating is disposed on the quarter wave plate and located between the display component and the quarter wave plate;

[0017] The polarized reflective coating is disposed on the linear polarization converter and is located between the linear polarization converter and the visual convergence adjustment conflict mitigation structure.

[0018] In one embodiment, the refractive power of the vision correction structural component is greater than or equal to 7D, and the refractive power of the visual amplitude adjustment conflict mitigation structural component is greater than or equal to 3.4D.

[0019] In one embodiment, in a first state, the linear polarization converter directly transmits the first display light of the display component after being converted by the quarter-wave plate through the polarized reflective coating;

[0020] In the second state, the linear polarization converter converts the polarization angle of the display light to obtain polarization-converted light, which is reflected by the polarization reflective coating, sequentially passes through the linear polarization converter, the first liquid crystal variable focus aspheric lens, the third lens, and the quarter-wave plate, and is reflected to the semi-transmissive reflective coating. The semi-transmissive reflective coating reflects the display light, sequentially passes through the quarter-wave plate, the third lens, the first liquid crystal variable focus aspheric lens, and the linear polarization converter, and is transmitted out of the polarization reflective coating.

[0021] In one embodiment, the third lens is an aspherical lens.

[0022] Furthermore, in one embodiment, the second liquid crystal variable focus aspheric lens is configured to control the refractive power of the visual amplitude adjustment conflict mitigation structure by adjusting voltage;

[0023] The first liquid crystal variable focus aspheric lens is configured to control the diopter of the first liquid crystal variable focus aspheric lens by adjusting a voltage;

[0024] The linear polarization converter is configured to control the conversion state of the linear polarized light by applying power;

[0025] The semi-transmissive reflective coating is configured to transmit the outgoing light of the display component and reflect the reflected light converted twice by the quarter-wave plate and the linear polarization converter to form a second display light;

[0026] The polarized reflective coating is configured to transmit the first display light of the display component after being converted by the quarter-wave plate, reflect the polarization-converted light converted by the linear polarization converter, and transmit the second display light formed by reflection from the semi-transmissive reflective coating.

[0027] In one embodiment, the optical device further includes the display component.

[0028] In one embodiment, the optical device is a head-mounted display.

[0029] In one embodiment, the optical device is specifically virtual reality glasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Schematic diagram of the principle of traditional technology to alleviate visual amplitude-accommodation conflict.

[0032] Figure 2 Schematic diagram of the structure of an embodiment of the optical device described in this application.

[0033] Figure 3 Schematic diagram of the structure of another embodiment of the optical device described in this application.

[0034] Figure 4 for Figure 3 Schematic diagram of the application of the embodiment shown.

[0035] Figure 5 for Figure 4 Schematic diagram of the application of the second liquid crystal variable focus aspheric lens of the embodiment shown.

[0036] Figure 6 for Figure 5 Schematic diagram of zoom adjustment of the second liquid crystal zoom aspheric lens in the illustrated embodiment.

[0037] Figure 7 for Figure 3 Schematic diagram of the application of the vision correction structural component of the embodiment shown.

[0038] Figure 8 for Figure 7 Schematic diagram of vision correction application of the illustrated embodiment.

[0039] Figure 9 for Figure 7 Schematic diagram of light transmission of the illustrated embodiment.

[0040] Figure 10 for Figure 8 Schematic diagram of light transmission of the illustrated embodiment.

[0041] Figure 1: Display component 100, vision correction structure 200, semi-transmissive reflective coating 210, quarter-wave plate 220, third lens 230, first liquid crystal variable focus aspheric lens 240, linear polarization converter 250, polarized reflective coating 260, visual amplitude adjustment conflict mitigation structure 300, second liquid crystal variable focus aspheric lens 310, virtual image 400, eye 500, outgoing light L1, first display light L2, polarization conversion light L3, reflected light L4, second display light L5. DETAILED DESCRIPTION

[0042] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0043] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0045] In this application, unless otherwise expressly specified or limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or that the first feature and the second feature are indirectly in contact through an intermediate medium. Furthermore, a first feature being “above,” “above,” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below,” “below,” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the relevant listed items.

[0047] The present application discloses an optical device, which includes some or all of the structures of the following embodiments; that is, the optical device includes some or all of the following technical features. In one embodiment of the present application, an optical device includes a vision correction structure and a visual convergence adjustment conflict mitigation structure, wherein the vision correction structure is arranged between a display component and the visual convergence adjustment conflict mitigation structure; the vision correction structure controls the transmission distance of light inside the vision correction structure by liquid crystal zoom and linear polarization conversion; the visual convergence adjustment conflict mitigation structure controls the focal length of light in the visual convergence adjustment conflict mitigation structure by liquid crystal zoom. The above-mentioned optical device, on the one hand, cooperates with the vision correction structure and the visual convergence adjustment conflict mitigation structure, and there is no need to reserve space for lens displacement and mechanical structure adjustment, which is beneficial to reducing the volume and weight of the optical device; on the other hand, it comprehensively considers the diopter adjustment of the visual convergence adjustment conflict and the diopter adjustment of the vision correction, which is beneficial to improving the range of diopter adjustment, so that the optical device has a wider range of application. According to actual measurements, it can meet but is not limited to correcting myopia from 600 degrees to hyperopia from 100 degrees; on the other hand, the diopter adjustment of the visual convergence adjustment conflict and the diopter adjustment of the vision correction can be controlled separately, and is not limited to the simultaneous use of the two functions.

[0048] In one embodiment, an optical device such as Figure 2 As shown, it includes a vision correction structure 200 and a vision amplitude adjustment conflict mitigation structure 300, combined with Figure 3The vision correction structure 200 is disposed between the display assembly 100 and the vision convergence adjustment conflict mitigation structure 300. Figure 4 The display component 100 and the virtual image 400 formed thereby are located on one side of the vision correction structure 200 and the visual convergence adjustment conflict mitigation structure 300 , and the user's eye 500 is located on the other side of the vision correction structure 200 and the visual convergence adjustment conflict mitigation structure 300 .

[0049] In one embodiment, the refractive power of the vision correction structure 200 is greater than or equal to 7D, and the refractive power of the visual convergence adjustment conflict mitigation structure 300 is greater than or equal to 3.4D, so that the optical device as a whole has a variable refractive power adjustment range of 10.4D. In this embodiment, the optical device as a whole has a total refractive power of 0D to 100D to provide an upright magnified virtual image to the user, i.e., the wearer. Taking the application level into consideration, the total refractive power of the lens assembly of the present invention is between 0D and 100D, of which a 7D adjustment range is used for vision correction, used to correct myopia from 600 degrees to hyperopia from 100 degrees; and a 3.4D adjustment range is used to mitigate visual convergence adjustment conflict. The 3.4D adjustment range is used to alleviate visual convergence adjustment conflict so that the focal plane can be moved from 0.3 meters to infinity. The total adjustable range is more than 10.4D, so it has a relatively wide applicability.

[0050] In each embodiment, the vision correction structural component 200 is used to adjust the diopter to achieve vision correction through non-mechanical movement. The vision correction structural component 200 controls the transmission distance of light inside the vision correction structural component 200 through liquid crystal zoom and linear polarization conversion, thereby achieving diopter adjustment, that is, the diopter adjustment of liquid crystal zoom is achieved through electrical control, and the light conversion of linear polarization conversion is achieved through electrical control, thereby controlling the transmission distance of the outgoing light of the display component 100 inside the vision correction structural component 200, so that the outgoing light is directly transmitted out of the vision correction structural component 200, or the outgoing light is reflected at least twice inside the vision correction structural component 200 and then transmitted out of the vision correction structural component 200.

[0051] In various embodiments, the visual convergence adjustment conflict mitigation structure 300 controls the focal length of light in the visual convergence adjustment conflict mitigation structure 300 by liquid crystal zoom. In one embodiment, the visual convergence adjustment conflict mitigation structure 300 includes a second liquid crystal zoom aspheric lens 310. Figure 5 and Figure 6The second liquid crystal variable focus aspheric lens 310 has a variable focal length. As previously described, the diopter P = 1 / focal length f, and therefore has a variable diopter P. In one embodiment, the second liquid crystal variable focus aspheric lens 310 is configured to control the diopter of the visual amplitude adjustment conflict mitigation structure 300 by adjusting a voltage. The liquid crystal variable focus aspheric lens, including the second liquid crystal variable focus aspheric lens 310 and the first liquid crystal variable focus aspheric lens described below, is a liquid crystal-based micro-focus lens. Its specific implementation includes, but is not limited to, placing the lens in a liquid crystal environment and adjusting the refractive index of the liquid crystal by varying the applied voltage, thereby controlling the focal length of the lens and adjusting the variable diopter of the liquid crystal variable focus aspheric lens.

[0052] In other embodiments, the visual convergence adjustment conflict mitigation structure 300 may also include a plane mirror or a reflective film. In one embodiment, the visual convergence adjustment conflict mitigation structure 300 also includes a fourth lens, a semi-transparent and semi-reflective coating, and a semi-reflective coating. The display light transmitted by the vision correction structure 200, including the first display light and the second display light, is directly transmitted through the second liquid crystal variable focus aspheric lens 310 or directly transmitted through the second liquid crystal variable focus aspheric lens 310 and the semi-reflective coating, or sequentially passes through the semi-transparent and semi-reflective coating, the fourth lens, and the second liquid crystal variable focus aspheric lens 310, is reflected by the semi-reflective coating to the second liquid crystal variable focus aspheric lens 310, passes through the fourth lens, is reflected by the semi-transparent and semi-reflective coating to the fourth lens and the second liquid crystal variable focus aspheric lens 310, and is transmitted through the semi-reflective coating. The remaining embodiments can be implemented with reference to the above design ideas and will not be described in detail.

[0053] In one embodiment, Figure 7 As shown, the vision correction structure 200 includes a semi-transmissive reflective coating 210, a quarter wave plate 220, a third lens 230, a first liquid crystal zoom aspheric lens 240, a linear polarization converter 250 and a polarized reflective coating 260 arranged in sequence; Figure 3 and Figure 4The quarter-wave plate 220 is disposed adjacent to the display assembly 100. The semi-transmissive reflective coating 210 is disposed on the quarter-wave plate 220 and positioned between the display assembly 100 and the quarter-wave plate 220. The polarized reflective coating 260 is disposed on the linear polarization converter 250 and positioned between the linear polarization converter 250 and the visual convergence adjustment conflict mitigation structure 300. In this embodiment, the third lens 230 is an aspheric lens. The present application cleverly utilizes a linear polarization converter 250, i.e., a polarization controller (PC). When polarized light is transmitted in a medium with birefringence, the light beam whose polarization is perpendicular to the plane formed by the optical axis and the propagation vector is called normal light (o-light), and the light beam whose polarization is within the plane formed by the optical axis and the propagation vector is called abnormal light (e-light, also known as anomalous light). Due to the different transmission speeds of o-light and e-light, one light beam is phase-delayed relative to the other light beam, thereby causing the polarization state of the light to change. In this way, the polarization reflective coating 260, i.e., the polarization reflective film 260 coated on the linear polarization converter 250, can be used to control the transmission distance of light within the vision correction structure 200 through linear polarization conversion, as described in detail below.

[0054] In one embodiment, Figure 7 As shown, in the first state, the linear polarization converter 250 directly transmits the first display light of the display component 100 after being converted by the quarter-wave plate 220 through the polarized reflective coating 260; that is, the outgoing light of the display component 100 sequentially passes through the semi-transmissive reflective coating 210, the quarter-wave plate 220, the third lens 230, the first liquid crystal variable focus aspheric lens 240, the linear polarization converter 250 and the polarized reflective coating 260, and is incident on the visual amplitude adjustment conflict mitigation structure 300 or its second liquid crystal variable focus aspheric lens 310.

[0055] And as Figure 8As shown, in the second state, the linear polarization converter 250 converts the polarization angle of the display light to produce polarized converted light, which is reflected by the polarizing reflective coating 260, sequentially passes through the linear polarization converter 250, the first liquid crystal variable focus aspheric lens 240, the third lens 230, and the quarter-wave plate 220, and is reflected to the semi-transmissive reflective coating 210. The light is then reflected by the semi-transmissive reflective coating 210, sequentially passes through the quarter-wave plate 220, the third lens 230, the first liquid crystal variable focus aspheric lens 240, and the linear polarization converter 250, and is transmitted out of the polarizing reflective coating 260. It is further understood that the first and second states of the linear polarization converter 250 are switched by power-on control, including control by power-on or power-off, and control by different voltages.

[0056] In specific applications, three-dimensional display is taken as an example but not limited to the following situations. For example, a left circularly polarized image is converted into a horizontally polarized image by the quarter-wave plate 220. The horizontal image then passes through the linear polarization converter 250 to determine whether the polarization reflective coating 260 is active. If the polarization reflective coating 260 is inactive, the light directly passes through the lens assembly, i.e., the entire vision correction structure 200, without any optical folding. If the polarization reflective coating 260 is active, the horizontal image is reflected and sequentially passes through the linear polarization converter 250, the first liquid crystal variable focus aspheric lens 240, the third lens 230, and the quarter-wave plate 220. The image is then converted into a left circularly polarized image by the quarter-wave plate 220. The image is then reflected by the semi-transmissive reflective coating 210 to convert the left circularly polarized image into a right circularly polarized image. The image is then converted into a vertically polarized image by the quarter-wave plate 220 and sequentially passes through the third lens 230, the first liquid crystal variable focus aspheric lens 240, the linear polarization converter 250, the polarization reflective coating 260, and the second liquid crystal variable focus aspheric lens 310 before being emitted. The remaining embodiments are similar and will not be described in detail.

[0057] Furthermore, in one embodiment, the second liquid crystal variable focus aspheric lens 310 is configured to control the refractive power of the visual amplitude adjustment conflict mitigation structure 300 by adjusting the voltage; the first liquid crystal variable focus aspheric lens 240 is configured to control the refractive power of the first liquid crystal variable focus aspheric lens 240 by adjusting the voltage; the linear polarization converter 250 is configured to control the conversion state of linear polarized light by powering on; the semi-transmissive reflective coating 210 is configured to transmit the outgoing light of the display component 100 and reflect the reflected light converted twice by the quarter-wave plate 220 and the linear polarization converter 250 to form a second display light; the polarized reflective coating 260 is configured to transmit the first display light of the display component 100 after being converted by the quarter-wave plate 220, reflect the polarization-converted light converted by the linear polarization converter 250, and transmit the second display light reflected by the semi-transmissive reflective coating 210. This design is relevant to head-mounted displays, particularly VR display technology. By combining liquid crystal lenses with a stacked lens structure, it simultaneously mitigates visual acuity and corrects vision. Thanks to the electrically controllable nature of the liquid crystal, the wearer can achieve continuous zoom, mitigating visual acuity and correcting vision in real time while using the head-mounted display. This eliminates the need for users to adjust the degree of vision correction by putting the headset on and off, while also reducing the overall size of the VR Glass.

[0058] Specifically, if Figure 9 As shown, the output light L1 of the display assembly first passes through the semi-transmissive reflective coating 210 and is incident on the quarter-wave plate 220. After being converted by the quarter-wave plate 220, it is formed into the first display light L2. The first display light L2 is then incident on the linear polarization converter 250 through the third lens 230 and the first liquid crystal variable focus aspheric lens 240. In the first state, the linear polarization converter 250 directly transmits the first display light L2. The polarized reflective coating 260 has no effect on the first display light L2, and thus also directly transmits the first display light L2 to be presented to the user, for example, to the user's eye 500.

[0059] like Figure 10As shown, in the second state, the linear polarization converter 250 converts the polarization angle of the first display light L2 to obtain a polarization-converted light L3. The polarization-converted light L3 cannot pass through the polarization-reflective coating 260. The polarization-reflective coating 260 reflects the polarization-converted light L3, such as by total reflection, to form a reflected light L4. The reflected light L4 passes through the linear polarization converter 250, the first liquid crystal variable focus aspheric lens 240, the third lens 230, and the quarter-wave plate 220 in sequence, and completes a conversion at the quarter-wave plate 220. The converted reflected light L4 cannot pass through the semi-transmissive reflective coating 210. The semi-transmissive reflective coating 210 reflects the converted reflected light L4, such as by total reflection, to form a second display light L5. The second display light L5 is The light L5 is converted once more in the quarter-wave plate 220. The converted second display light L5 passes through the third lens 230, the first liquid crystal variable focus aspheric lens 240, and the linear polarization converter 250 in sequence, and is incident on the polarized reflective coating 260. Since the reflected light L4 of the polarized reflective coating 260 is converted twice by the quarter-wave plate 220, the obtained second display light L5 can be transmitted through the polarized reflective coating 260, thereby achieving diopter adjustment for vision correction without any mechanical structure adjustment, and the diopter adjustment for vision correction can be controlled separately from the diopter adjustment that conflicts with the visual convergence adjustment; correspondingly, the diopter adjustment that conflicts with the visual convergence adjustment can also be controlled separately from the diopter adjustment for vision correction.

[0060] Specifically, in one embodiment, in combination Figure 9 and Figure 10 , the linear polarization converter 250 is powered on to the first state, at which time the vision correction structure 200 has a PC-on diopter:

[0061] P on =P 第三透镜 +P 第一液晶变焦非球面透镜,e ; abbreviated as P on =P 230 +P 240,e .

[0062] The linear polarization converter 250 is powered off and is in the second state. At this time, the vision correction structure 200 has a PC-off diopter:

[0063] P off =3×P 第三透镜 +2×P 第一液晶变焦非球面透镜,e +P 第一液晶变焦非球面透镜,o ; abbreviated as P off =3×P 230 +2×P 240,e +P240,o .

[0064] Considering P on P in 230 +P 240,e With P 230 +P 240,o The refractive power change, and P off 3×P 230 +2×P 240,e +P 240,o With 3×P 230 +3×P 240,o Based on the size design of the current virtual reality glasses, it can be obtained that the diopter change amplitude in the diopter change range is greater than or equal to 7D, that is, the diopter of the vision correction structural component 200 is greater than or equal to 7D.

[0065] Similarly, under the action of the second liquid crystal zoom aspheric lens 310, the diopter change range is P 第二液晶变焦非球面透镜,o With P 第二液晶变焦非球面透镜,e , abbreviated as P 310,o With P 310,e Based on the size design of current virtual reality glasses, it can be obtained that the diopter change amplitude in the diopter change range is greater than or equal to 3.4D, that is, the diopter of the visual amplitude convergence adjustment conflict mitigation structural member 300 is greater than or equal to 3.4D.

[0066] This design can adjust the surface curvature design and material refractive index according to usage requirements, which can achieve the purpose of simultaneously alleviating visual convergence and accommodation conflicts and correcting vision. In addition, the continuous and rapid zooming through electronic control can help reduce discomfort when using virtual reality glasses or VR displays.

[0067] In one embodiment, the optical device further includes the display assembly. In one embodiment, the optical device is a wearable device. In one embodiment, the optical device is a head-mounted display. In one embodiment, the optical device is a virtual reality pair of glasses, i.e., the head-mounted display is a virtual reality pair of glasses. This design, on the one hand, by coordinating the vision correction structure and the visual convergence adjustment conflict mitigation structure, eliminates the need to reserve space for lens displacement and mechanical structural adjustment, thereby reducing the size and weight of the optical device. On the other hand, it comprehensively considers the diopter adjustment for visual convergence adjustment conflict and the diopter adjustment for vision correction, thereby increasing the range of diopter adjustment and making the optical device have a wider range of applications. Furthermore, the diopter adjustment for visual convergence adjustment conflict and the diopter adjustment for vision correction can be controlled separately, without being limited to the simultaneous use of the two functions.

[0068] It should be noted that other embodiments of the present application also include optical devices that can be implemented by combining the technical features in the above embodiments.

[0069] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of patent protection for the present application shall be determined by the appended claims.

Claims

1. An optical device, characterized in that: It comprises a vision correction structural component (200) and a vision convergence adjustment conflict mitigation structural component (300), wherein the vision correction structural component (200) is arranged between the display component (100) and the vision convergence adjustment conflict mitigation structural component (300); The vision correction structural component (200) controls the transmission distance of light inside the vision correction structural component (200) through a liquid crystal zoom method and a linear polarization conversion method; The visual convergence adjustment conflict mitigation structural member (300) controls the focal length of light in the visual convergence adjustment conflict mitigation structural member (300) by means of liquid crystal zoom; The vision correction structure (200) comprises a semi-transmissive reflective coating (210), a quarter-wave plate (220), a third lens (230), a first liquid crystal zoom aspheric lens (240), a linear polarization converter (250), and a polarized reflective coating (260) arranged in sequence; the quarter-wave plate (220) is arranged adjacent to the display component (100), the semi-transmissive reflective coating (210) is arranged on the quarter-wave plate (220), and is located between the display component (100) and the quarter-wave plate (220); the polarized reflective coating (260) is arranged on the linear polarization converter (250), and is located between the linear polarization converter (250) and the visual amplitude adjustment conflict mitigation structure (300).

2. The optical device according to claim 1, wherein: The vision correction structural component (200) adjusts the liquid crystal zoom mode and the linear polarization conversion mode respectively through an electric control method, and the visual amplitude adjustment conflict mitigation structural component (300) adjusts the liquid crystal zoom mode through an electric control method.

3. The optical device according to claim 1, wherein: The visual amplitude adjustment conflict mitigation structural component (300) comprises a second liquid crystal variable focus aspheric lens (310).

4. The optical device according to claim 3, characterized in that: The refractive power of the vision correction structural component (200) is greater than or equal to 7D, and the refractive power of the vision convergence adjustment conflict mitigation structural component (300) is greater than or equal to 3.4D.

5. The optical device according to claim 3, characterized in that: In a first state, the linear polarization converter (250) directly transmits the first display light of the display component (100) after being converted by the quarter-wave plate (220) through the polarized reflective coating (260); Furthermore, in the second state, the linear polarization converter (250) converts the polarization angle of the display light to obtain polarization-converted light, which is reflected by the polarization-reflective coating (260), sequentially passes through the linear polarization converter (250), the first liquid crystal variable focus aspheric lens (240), the third lens (230), and the quarter-wave plate (220), and is reflected to the semi-transmissive reflective coating (210), is reflected by the semi-transmissive reflective coating (210), sequentially passes through the quarter-wave plate (220), the third lens (230), the first liquid crystal variable focus aspheric lens (240), and the linear polarization converter (250), and is transmitted out of the polarization-reflective coating (260).

6. The optical device according to claim 3, characterized in that: The third lens (230) is an aspherical lens.

7. The optical device according to any one of claims 1 to 6, characterized in that: Also included is the display assembly.

8. The optical device according to claim 7, characterized in that: Specifically, a head-mounted display.

9. The optical device according to claim 8, characterized in that: Specifically, virtual reality glasses.

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