Optical display system and intelligent head-mounted device

Abstract

The embodiment of the invention provides an optical display system and intelligent head-mounted equipment. The optical display system comprises a display assembly, an imaging assembly and a zoom lens group which are arranged along the same optical axis. Wherein the zoom lens group comprises a first lens and a second lens which are adjacent to each other and arranged at an interval, and at least one of the first lens and the second lens can slide along the direction perpendicular to the optical axis so as to adjust the virtual image distance of the optical display system, thereby adapting to the diopter of a wearer.

Description

Technical Field

[0001] This application relates to the field of optical display device technology, and more specifically, to an optical display system and a smart head-mounted device. Background Technology

[0002] With the rapid development of virtual reality technology, consumers have placed higher demands on the fit and portability of virtual reality devices. However, because everyone's visual acuity is different, traditional smart head-mounted devices struggle to provide accurate visual acuity matching for all users, thus affecting the user experience.

[0003] The traditional solution is to provide nearsighted users with additional lenses of a specific prescription or custom lenses to match their vision needs. However, this approach has several drawbacks. First, additional or custom lenses increase the complexity and cost of smart head-mounted devices, hindering their market promotion and widespread adoption. Second, because users' nearsightedness varies, it is difficult to provide each user with lenses of perfectly accurate prescription, thus affecting their visual experience and comfort. Summary of the Invention

[0004] The purpose of this application is to provide a new technical solution for an optical display system and a smart head-mounted device.

[0005] In a first aspect, embodiments of this application provide an optical display system, which includes a display component, an imaging component, and a zoom lens group arranged along the same optical axis;

[0006] The zoom lens group includes a first lens and a second lens arranged adjacent to each other and spaced apart. At least one of the first lens and the second lens can slide along a direction perpendicular to the optical axis to adjust the virtual image distance of the optical display system, thereby adapting to the wearer's vision.

[0007] Optionally, the zoom lens group is an Alvarez lens group.

[0008] Optionally, both the first lens and the second lens are freeform surface lenses;

[0009] or,

[0010] The first lens and the second lens are liquid crystal flat panels with different refractive index gradients.

[0011] Optionally, the first lens is located on the side closer to the display component, and the second lens is located on the side farther away from the display component;

[0012] The optical display system further includes a control component connected to the first lens. The control component is configured to control the first lens to slide relative to the second lens in a direction perpendicular to the optical axis according to the wearer's diopter. When the sliding distance of the first lens is within a set distance, the virtual image distance corresponding to the current sliding distance is taken as the virtual image distance that matches the wearer's diopter.

[0013] Optionally, the movement range of the first lens is L1, where 0 ≤ L1 ≤ 12 mm.

[0014] Optionally, the first lens is located on the side closer to the display component, and the second lens is located on the side farther away from the display component;

[0015] The optical display system further includes a control component, which is connected to the first lens and the second lens respectively. The control component is configured to control the first lens and the second lens to slide relative to each other in a direction perpendicular to the optical axis according to the wearer's diopter. When the sliding distance between the first lens and the second lens is within a set distance, the virtual image distance corresponding to the current sliding distance is taken as the virtual image distance that matches the wearer's diopter.

[0016] Optionally, the movement range of both the first lens and the second lens is L0, where 0≤L0≤6mm.

[0017] Optionally, the optical display system further includes an eye-tracking component;

[0018] The display component is capable of displaying a vision test image, which includes a first identifier or a second identifier of different sizes; wherein the first identifier has a different magnification.

[0019] The eye-tracking component works in conjunction with the display component to determine the wearer's visual acuity.

[0020] Optionally, when the wearer's eyes fixate on a clearly identifiable mark and the fixation time reaches a preset duration, the eye-tracking component is used to track the fixation point position of the wearer's eyes and identify the mark corresponding to that fixation point position;

[0021] The optical display system further includes a processing unit for determining the wearer's visual acuity based on the identified identifier and preset mapping data; wherein the mapping data reflects the correspondence between visual acuity information and the identifier.

[0022] Optionally, the eye-tracking component is located on the side of the zoom lens group away from the display component;

[0023] The eye-tracking component includes an infrared light source and an infrared camera.

[0024] Optionally, when the wearer's eyes fixate on a clearly identifiable sign and the fixation time reaches a preset duration, the infrared light source emits infrared light into the wearer's eyes, and the infrared camera captures the infrared light reflected by the wearer's eyes, thereby determining the position of the wearer's gaze point.

[0025] Optionally, when the virtual image distance of the optical display system matches the wearer's visual acuity, the eye-tracking component is used to track the wearer's eye movement information in real time;

[0026] The optical display system further includes a control component, which is used to control at least one of the first lens and the second lens to slide in a direction perpendicular to the optical axis according to the eye movement information, so as to adjust the focal length of the optical display system in real time.

[0027] Optionally, the imaging component is a folded optical path lens module.

[0028] Optionally, the imaging assembly includes at least one lens disposed along the optical axis, as well as a reflective polarizer, a phase retarder, and a beam splitter, wherein the phase retarder is located between the reflective polarizer and the beam splitter.

[0029] Optionally, the at least one lens includes a convex lens;

[0030] The reflective polarizer is a polarizing reflective film, and the reflective polarizer is disposed on the surface of the convex lens away from the display component;

[0031] The phase delayer is a quarter-wave plate, the beam splitter is a semi-transparent and semi-reflective film, and the phase delayer and the beam splitter are stacked and disposed together on the surface of the convex lens near the display component.

[0032] Optionally, the imaging component is a Fresnel lens group.

[0033] Secondly, embodiments of this application provide a smart head-mounted device, the smart head-mounted device comprising:

[0034] The outer casing; and

[0035] An optical display system, wherein the optical display system is the optical display system as described in the first aspect.

[0036] Optionally, the smart head-mounted device is VR smart glasses;

[0037] The outer shell is an eyeglass frame, and the optical display system is configured as two, one of which is located on the left side of the eyeglass frame for the wearer's left eye, and the other of which is located on the right side of the eyeglass frame for the wearer's right eye.

[0038] The beneficial effects of this application are as follows:

[0039] To address the limitations of existing smart head-mounted devices, such as virtual reality (VR) devices, in adapting to nearsighted users, this application proposes an optical display system integrating a zoom lens group. This system, by combining the wide-range zoom performance of the zoom lens group, achieves virtual image distance adjustment, thereby significantly improving the adaptability and wearing comfort of VR devices for users with different visual acuity. The optical display system provided in this application not only overcomes the drawbacks of traditional methods requiring additional or customized lenses, reducing the complexity and cost of VR devices, but also enhances the user experience, facilitating the popularization and in-depth application of VR technology. Furthermore, this optical display system has a simple structure and low cost, offering broad application prospects.

[0040] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0042] Figure 1 The structure and optical path diagram of the optical display system provided in the embodiments of this application;

[0043] Figure 2 This is a schematic diagram showing different working states of the zoom lens group provided in the embodiments of this application.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Display component; 2. Imaging component; 21. Convex lens; 22. Reflective polarizer; 23. Phase delayer; 24. Beam splitter; 3. Zoom lens group; 31. First lens; 32. Second lens; 4. Eye tracking component; 41. Infrared light source; 42. Infrared camera; 01. Human eye. Detailed Implementation

[0046] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0047] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0048] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0049] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0050] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0051] The optical display system and smart head-mounted device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0052] The optical display system provided in this application embodiment is described in [reference]. Figure 1 and Figure 2 The optical display system includes a display component 1, an imaging component 2, and a zoom lens group 3 arranged along the same optical axis; wherein, the zoom lens group 3 includes a first lens 31 and a second lens 32 arranged adjacent to each other and spaced apart, at least one of the first lens 31 and the second lens 32 can slide along a direction perpendicular to the optical axis to adjust the virtual image distance of the optical display system, thereby adapting to the wearer's vision.

[0053] The optical display system provided in this application mainly includes the following key optical components.

[0054] Display component 1: It is used to display images. For example, the display component 1 can display imaging images, and it can also display vision test images.

[0055] Imaging component 2: In this application, the main function of the imaging component 2 is to perform optical processing on the image light emitted by the display component 1 so that it can form a clear virtual image for the wearer to have a visual experience through the optical display system.

[0056] Zoom lens group 3: It includes a first lens 31 and a second lens 32, at least one of which can slide along a direction perpendicular to the optical axis. See details... Figure 2 By changing the relative position between the first lens 31 and the second lens 32, the virtual image distance of the entire optical display system can be adjusted, thereby achieving adaptation to the wearer's visual acuity.

[0057] The adjustment of the virtual image distance enables the optical display system of this application to adapt to the viewing angles of different wearers, achieving a clear visual experience.

[0058] The optical display system provided in this application embodiment can automatically adapt to the visual acuity of different wearers' eyes, significantly improving the adaptability and user experience of smart head-mounted devices (such as virtual reality devices) that use this optical display system.

[0059] Compared to traditional methods of custom lenses or additional prescription lenses, the automated adaptation function of the optical display system provided in this application embodiment does not require preparing lenses with a specific prescription for each user, thereby reducing production costs.

[0060] Furthermore, the diopter adjustment function ensures that users always have a clear visual experience during use, reducing visual fatigue and discomfort caused by diopter mismatch.

[0061] In summary, addressing the limitations of existing smart head-mounted devices such as virtual reality (VR) devices in adapting to nearsighted users, this application proposes an optical display system integrating a zoom lens group. This system, by combining the wide-range zoom performance of the zoom lens group 3, achieves virtual image distance adjustment, thereby significantly improving the adaptability and wearing comfort of VR devices for users with different visual acuity. The optical display system provided in this application not only overcomes the drawbacks of traditional methods requiring additional or customized lenses, reducing the complexity and cost of VR devices, but also enhances the user experience, facilitating the popularization and in-depth application of VR technology. Furthermore, this optical display system has a simple structure and low cost, possessing broad application prospects.

[0062] In some examples of this application, the zoom lens group 3 is an Alvarez lens group.

[0063] See Figure 1 and Figure 2 The Alvarez lens group can achieve a wide range of zoom by sliding the first lens 31 (located on the side away from the human eye 01) and the second lens 32 (located on the side closer to the human eye 01) in a direction perpendicular to the optical axis. This zoom capability significantly improves the universality and user experience of smart head-mounted devices.

[0064] The Alvarez lens group in this application can dynamically adjust the virtual image distance by controlling the lens sliding distance based on the wearer's diopter information, thereby matching the wearer's diopter. This dynamic adjustment capability ensures that the wearer can obtain a clear and comfortable visual experience under different visual needs.

[0065] Compared to traditional custom lens methods, the Alvarez lens group achieves diopter matching through dynamic adjustment rather than static customization, which greatly reduces production costs.

[0066] In some examples of this application, the first lens 31 and the second lens 32 are both freeform lenses; or, the first lens 31 and the second lens 32 are liquid crystal flat panels with different refractive index gradients.

[0067] According to this example of the present application, the two lenses included in the zoom lens group 3 can both be freeform lenses. Compared with traditional spherical or aspherical lenses, freeform lenses have a higher degree of design freedom and can achieve more complex optical performance. Specifically, the surface shape of a freeform lens is no longer a simple sphere or a rotationally symmetric aspherical surface, but a complex curved surface that can be freely designed according to specific needs. This design gives freeform lenses significant advantages in correcting aberrations, expanding the field of view, and improving image quality.

[0068] In this example of the application, using a freeform lens as the lens element of the zoom lens group 3 offers several advantages. For instance, the complex curved shape of the freeform lens can better correct various aberrations during the imaging process, thereby improving image quality. Because freeform lenses offer greater design freedom, zoom lens group 3 with a wider zoom range can be designed to meet the broader visual acuity needs of different wearers. In summary, freeform lenses provide greater flexibility in adjusting the virtual image distance, better adapting to the eye parameters and visual conditions of different wearers. This adaptability contributes to improved wearing comfort and visual experience.

[0069] In this example of the application, the zoom lens group 3 can also be designed to include two liquid crystal panels with different refractive indices as a first lens 31 and a second lens 32. Because the two liquid crystal panels have different refractive indices, diopter adjustment can be achieved during their relative movement.

[0070] Among them, LCD flat panels have a significant advantage in thickness, which helps to achieve a more compact and lighter optical display system design.

[0071] According to the example provided in this application, the zoom lens group 3 uses a thin and light liquid crystal panel, which makes the design of the zoom lens group 3 more compact. This helps to reduce the overall size and weight of the entire optical display module and the virtual reality smart head-mounted device that uses the optical display module, thereby improving wearing comfort.

[0072] In another scenario, the zoom lens group 3 can be an electrically controlled liquid crystal lens for adjusting diopter. In this case, by applying voltage to control the arrangement of liquid crystal molecules, the refraction path of light can be changed, thereby adjusting the focal length and thus regulating the diopter of the wearer's eyes.

[0073] See some examples in this application. Figure 1 The first lens 31 is located on the side closer to the display component 1, and the second lens 32 is located on the side farther away from the display component 1. The optical display system further includes a control component connected to the first lens 31. The control component is configured to control the first lens 31 to slide relative to the second lens 32 in a direction perpendicular to the optical axis according to the wearer's diopter. When the sliding distance of the first lens 31 is within a set distance, the virtual image distance corresponding to the current sliding distance is taken as the virtual image distance that matches the wearer's diopter.

[0074] The first lens 31 has a movement range of L1, where 0 ≤ L1 ≤ 12 mm.

[0075] In this example of the application, the first lens 31 (located on the side furthest from the human eye 01) is designed to slide relative to the second lens 32 (located on the side closer to the human eye 01) in a direction perpendicular to the optical axis. The vertical movement range of the first lens 31 is L1, and L1 is designed to be 0 ≤ L1 ≤ 12 mm. It should be noted that the 12 mm movement range here actually refers to the maximum distance that the movable lens, i.e., the first lens 31, can move vertically in a direction perpendicular to the optical axis. However, since the first lens 31 moves symmetrically, the actual effective distance for adjusting the focal length is 6 mm vertically and horizontally relative to the optical axis. The movement range design in this example of the application ensures that the zoom lens group 3 has a large zoom range to accommodate the visual acuity needs of most wearers.

[0076] By controlling the movement of the first lens 31 within the aforementioned example design range, the optical display system can dynamically adjust the focal length according to the wearer's diopter information, thereby achieving a virtual image distance that matches the wearer's eye diopter. This dynamic adaptability not only improves wearing comfort but also ensures clear image presentation under different diopters.

[0077] Compared to traditional custom-made lenses, the method of achieving diopter matching through the dynamic adjustment of the zoom lens group 3 significantly reduces production costs. Manufacturers no longer need to customize lenses for each user; instead, they can meet the diopter needs of different users with a single universal zoom lens group, thereby improving production efficiency and reducing maintenance costs.

[0078] It should be noted that designing the zoom lens group 3 to adjust the focal length solely by moving the first lens 31 helps to keep the structure of the smart head-mounted device simple. This design reduces the need for additional mechanical parts, making the entire head-mounted device lighter and easier to wear.

[0079] See some examples in this application. Figure 1 and Figure 2 The first lens 31 is located on the side closer to the display component 1, and the second lens 32 is located on the side farther away from the display component 1. The optical display system also includes a control component, which is connected to the first lens 31 and the second lens 32 respectively. The control component is configured to control the first lens 31 and the second lens 32 to slide relative to each other in a direction perpendicular to the optical axis according to the wearer's diopter. When the sliding distance between the first lens 31 and the second lens 32 is within a set distance, the virtual image distance corresponding to the current sliding distance is taken as the virtual image distance that matches the wearer's diopter.

[0080] The movement range of both the first lens 31 and the second lens 32 is L0, where 0≤L0≤6mm.

[0081] According to this example of the application, the zoom lens group 3 employs a dual-lens cooperative movement adjustment scheme. Specifically, the movement range of each lens in the zoom lens group 3 is L0, and L0 is set to 0 ≤ L0 ≤ 6 mm. This means that each of the two lenses has an adjustment space of 6 mm in the direction perpendicular to the optical axis. Furthermore, each lens can move vertically by 3 mm.

[0082] In the zoom lens group 3, by simultaneously controlling the movement of two lenses, the smart head-mounted device can respond more quickly to changes in the wearer's diopter and adjust the focal length more accurately to match the wearer's diopter. This dynamic adaptability ensures that the wearer can obtain a clear and comfortable visual experience in different usage scenarios.

[0083] In some examples of this application, the zoom lens group 3, i.e., the Alvarez lens group, has a zoom range of at least 6D.

[0084] The zoom lens group 3 is an Alvarez lens group, which includes a first lens 31 and a second lens 32 arranged along the same optical axis. By controlling the first lens 31 and / or the second lens 32 to slide relative to each other in a direction perpendicular to the optical axis, the zoom range of the zoom lens group 3 is at least 6D, which corresponds to the sliding distance of the movable lens in the two examples above.

[0085] In this example of the application, the statement about the zoom range covering at least 6D can be interpreted as: it can achieve zoom from -6D to 0D or zoom from -3D to 3D, etc.

[0086] By driving the two lenses to slide relative to each other in a direction perpendicular to the optical axis, the Alvarez lens group can achieve a zoom range of at least 6D. This wide zoom range enables smart head-mounted devices to be suitable for a wide range of users, from high myopia to low hyperopia, greatly improving the universality and user experience of smart head-mounted devices.

[0087] The focusing principle of the zoom lens group 3 is explained in detail below:

[0088] The zoom lens group 3 achieves focal length variation by moving two lenses, namely the first lens 31 and the second lens 32, relative to each other in a direction perpendicular to the optical axis. During the sliding process, these two lenses change the refraction path of light passing through the lens group, thereby changing the virtual image distance of the smart head-mounted device.

[0089] See Figure 2 , Figure 2 The figure shows three figures (a), (b), and (c). Figure (a) shows the original state of the two lenses of the zoom lens group 3. The two lenses are arranged adjacent to each other along the same optical axis and there is no slip distance between them. Figure 2 Figures (b) and (c) show that the focal length of the zoom lens group 3 changes accordingly when the relative positions of the two lenses change. Figure (b) shows that the focal length of the zoom lens group 3 shortens, causing the image position to shift forward (i.e., the virtual image distance to shorten), corresponding to a positive focal length, which is suitable for people with myopia. Figure (c) shows that the focal length of the zoom lens group 3 lengthens, causing the image position to shift backward (i.e., the virtual image distance to lengthen), corresponding to a negative focal length, which is suitable for people with hyperopia.

[0090] It should be noted that the optical display system provided in this application embodiment can not only adjust myopia, but also adjust hyperopia, making it suitable for a wider range of people.

[0091] See some examples in this application. Figure 1 The optical display system further includes an eye-tracking component 4; the display component 1 is capable of displaying a vision test image, the vision test image including a first marker or a second marker of different sizes; wherein the first marker has a different magnification; the eye-tracking component 4 cooperates with the display component 1 to determine the wearer's visual acuity.

[0092] It should be noted that the vision testing conditions for the wearer's eyes are as follows:

[0093] When testing the wearer's left eye's visual acuity, the right eye sees, for example, a black image; that is, the right eye is not tested. Conversely, when testing the wearer's right eye's visual acuity, the left eye sees, for example, a black image; that is, the left eye is not tested. In other words, only one eye of the wearer is tested at a time, and the visual acuity of both eyes is obtained after testing both eyes.

[0094] According to this example of the application, a vision test image can be displayed on the display component 1. This vision test image may contain, for example, second symbols of different sizes (such as letters of the letter E of different sizes), where each symbol corresponds to a specific degree of visual acuity (i.e., different degrees of visual acuity correspond to different symbol sizes). This design allows users to select symbols that they can clearly recognize based on their own vision, and to determine their visual acuity, such as the degree of myopia, or possibly hyperopia, based on the size of the symbol.

[0095] Of course, the marker on the vision test image can also be a marker with adjustable magnification, i.e., a first marker. In this case, different magnifications represent different degrees of visual acuity. Thus, the user's visual acuity information can also be obtained by detecting the size of a clearly identifiable marker.

[0096] The example design of this application utilizes the different sizes of markers in the vision test image to correspond to different degrees of visual acuity, enabling rapid determination of visual acuity and laying the foundation for subsequent precise adjustment of the virtual image distance of the optical display system.

[0097] In some examples of this application, when the wearer's eyes fixate on a clearly identifiable mark and the fixation time reaches a preset duration, the eye-tracking component 4 is used to track the fixation point position of the wearer's eyes and identify the mark corresponding to the fixation point position.

[0098] The optical display system further includes a processing unit for determining the wearer's visual acuity based on the identified identifier and preset mapping data; wherein the mapping data reflects the correspondence between visual acuity information and the identifier.

[0099] According to this example of the application: the eye-tracking component 4 is used to obtain the gaze point position of the wearer's eyes, thereby enabling the identification of the symbol being gazed at. This step is a key bridge connecting user selection and the response of the smart head-mounted device.

[0100] The eye-tracking technology provides high-precision eye position tracking, ensuring the accuracy of the wearer's (i.e., user's) gaze point identification. This allows the optical display system to instantly acquire the wearer's gaze behavior, providing data support for subsequent diopter calculation and adjustment.

[0101] In a specific example, the display on the display component 1 of the optical display system can guide the wearer to gaze and select a clearly identifiable marker of a specific size within the vision test image. At this time, the eye-tracking component 4 can acquire the wearer's gaze point position and identify the clearly identifiable marker selected. This process automates the detection of myopia / hyperopia, providing crucial data for subsequent adjustments to the virtual image distance of the smart head-mounted device.

[0102] Optionally, the preset duration is T, where T ≥ 2s.

[0103] Choosing 2 seconds as the minimum preset duration is primarily to ensure that the eye-tracking component 4 can stably and accurately capture the wearer's gaze point position. Shorter gaze durations may lead to misjudgments due to minor eye movements or accidental operations by the user, while gaze durations of 2 seconds or more can effectively improve detection accuracy.

[0104] From the wearer's perspective, a 2-second gaze time will not cause the wearer too much burden or discomfort, while also giving the wearer enough time to clearly identify and select the mark that they can see clearly.

[0105] Although the minimum duration is set to 2 seconds, this value can be adjusted according to specific needs in practical applications. For example, to further improve detection accuracy, the preset duration can be extended to 3 seconds or longer. However, an excessively long preset duration may degrade the user experience, so a balance needs to be found between accuracy and user experience.

[0106] See some examples in this application. Figure 1 The eye-tracking component 4 is located on the side of the zoom lens group 3 away from the display component 1; the eye-tracking component 4 includes an infrared light source 41 and an infrared camera 42.

[0107] For example, see Figure 1 The eye-tracking component 4 can be mounted on the zoom lens group 3.

[0108] When the eye-tracking component 4 is disposed on the zoom lens group 3, specifically, the second lens 32 closest to the human eye in the zoom lens group 3 is designed to be a stationary lens, while the first lens 31 can slide relative to the second lens 32. The zoom lens group 3 may have a housing, and the second lens 32 is fixed to the housing (or lens holder). With the eye-tracking component 4 disposed on the zoom lens group 3, the infrared light from the eye-tracking component 4 will not pass through the imaging component 2 and will not be affected by the imaging component 2.

[0109] In addition, the eye-tracking component 4 can also be disposed between the zoom lens group 3 and the imaging component 2.

[0110] In some examples of this application, when the wearer's eyes fixate on a clearly identifiable sign and the fixation time reaches a preset duration, the infrared light source 41 emits infrared light into the wearer's eyes, and the infrared camera 42 captures the infrared light reflected by the wearer's eyes, thereby determining the fixation point position of the wearer's eyes.

[0111] The eye-tracking component 4 mainly consists of an infrared light source 41 and an infrared camera 42, which work together with the display component 1 to complete the visual acuity detection of the wearer's eyes.

[0112] The infrared light source 41 emits infrared light, which is reflected after hitting the wearer's eyes. Because infrared light is not easily affected by ambient light, it ensures the accuracy and stability of eye tracking.

[0113] The infrared camera 42 is responsible for capturing infrared light reflected back from the eyeball and can determine the wearer's gaze point position through techniques such as image processing.

[0114] In some examples of this application, when the virtual image distance of the optical display system matches the wearer's visual acuity, the eye-tracking component 4 is used to track the wearer's eye movement information in real time;

[0115] The optical display system further includes a control component, which is used to control at least one of the first lens 31 and the second lens 32 to slide in a direction perpendicular to the optical axis according to the eye movement information, so as to adjust the focal length of the optical display system in real time.

[0116] In this example of the application, the eye-tracking component 4 participates in real-time tracking of the wearer's eye movements. This functionality is crucial for enabling real-time focus adjustment, as it provides immediate feedback on the wearer's current visual focus.

[0117] After the virtual image distance of the optical display system is adjusted to match the visual acuity of the wearer's eyes, the eye-tracking component 4 can track the wearer's eye movement information in real time.

[0118] Specifically, when the wearer's eye movement changes (for example, from observing a near object to a distant object), the eye-tracking component captures this change and feeds back the real-time eye movement information to the control component. At this time, the control component quickly calculates the new focal length requirement based on the real-time eye movement information and controls the driving component to drive the two lenses in the Alvarez lens group to make fine adjustments, so as to adjust the focal length of the optical display system in real time and ensure that the wearer can always see a clear image.

[0119] It should be noted that VAC (Vergence-Accommodation Conflict) is a significant issue in the fields of virtual reality (VR) and augmented reality (AR). It primarily refers to the visual discomfort and dizziness experienced by users when wearing VR / AR devices due to a mismatch between their vergence and accommodation mechanisms. The example provided in this application effectively addresses the VAC problem, ensuring the accuracy and reliability of smart head-mounted devices in real-time tracking of the wearer's eye movements and dynamic focus adjustment.

[0120] The optical display scheme for automatically matching eye prescription proposed in this application can also possess the related functions of other virtual reality smart head-mounted devices with eye-tracking capabilities, such as automatic IPD (interpupillary distance) adjustment and human-computer interaction. Furthermore, it adds an automatic human eye prescription recognition and matching function, further enhancing the overall performance and user experience of devices using this optical display system.

[0121] In this application, a control component is designed to control the sliding of the lenses in the zoom lens group 3. By integrating high-precision sensors and feedback mechanisms, the control component can achieve precise control over the relative movement of the two lenses, ensuring the accuracy of the focal length adjustment of the optical display system.

[0122] In this application, the integration of the control component with the zoom lens group 3 enables them to work together to achieve rapid and precise focal length adjustment. With the assistance of the eye-tracking component 4, this design allows the drive component to automatically adjust the relative positions of the two lenses in the zoom lens group 3 based on the wearer's eye movements and diopter information, thereby optimizing the focal length.

[0123] The introduction of the control components makes the focus adjustment process of the optical display system faster and more efficient. When it is necessary to quickly switch viewing distances or respond to changes in the wearer's vision, the optical display system can react quickly, ensuring the continuity and stability of the visual experience.

[0124] In a specific example, to precisely and efficiently adjust the focal length of the zoom lens group 3 to match the visual acuity of different wearers' eyes, the control component is designed with a high-speed linear motor. Specifically, a high-speed linear motor is used to control the sliding of the first lens 31 and the second lens 32. This design ensures that the optical display system can flexibly handle the adjustment needs of a wide range of visual acuity.

[0125] Specifically, the selected high-speed linear motor should have the following characteristics:

[0126] (1) High-speed performance: The motor runs at a speed of at least 1m / s, which ensures a rapid response during the focus adjustment process, allowing the wearer to experience a clear visual experience in a short time.

[0127] (2) High-precision positioning: The total stroke range of the motor is designed to be, for example, 12mm, which precisely corresponds to the adjustment range of the zoom lens group 3 diopter.

[0128] In addition, the accuracy of the high-speed linear motor should be able to reach 0.01mm, which means that for every tiny movement (such as 0.5mm), the diopter can be precisely changed by 0.25D, thereby realizing the fine-tuning function and ensuring that each wearer can obtain the most suitable visual clarity.

[0129] In addition to speed and accuracy, the motor's response time needs to be on the order of milliseconds. This ensures that the optical display system can make instantaneous adjustments when it detects changes in the wearer's eye movement or diopter, providing lag-free visual feedback.

[0130] When a wearer puts on a virtual reality smart head-mounted device that includes the optical display system of this application, the optical display system will automatically initiate a vision detection process for the wearer's eyes to ensure that each user receives a personalized visual experience.

[0131] In one example of this application, the optical display system initiates the vision detection process for the wearer's eyes as follows:

[0132] S1. Start detection: Once the smart head-mounted device senses that the wearer has worn the device correctly, it immediately starts the vision detection function.

[0133] S2. Displaying a vision test chart: The display component 1 displays a vision test image, for example, the vision test image contains multiple letters E of different sizes, each letter E corresponding to a specific diopter value, so that the user can select according to their own vision condition.

[0134] S3. Guiding the user to make a selection: Through the indication information displayed by the display component 1, the user is guided to observe the vision test image and select the smallest letter E that they can clearly recognize. To confirm the selection, the user must continuously look at the selected letter for at least 2 seconds.

[0135] S4. Capturing the gaze point: Using the integrated eye-tracking component 4, the optical display system captures and records the wearer's gaze point position. After the user completes the selection, the eye-tracking component 4 converts the wearer's gaze point position information into corresponding diopter data and transmits it to the processing unit (or processing circuit) configured in the smart head-mounted device.

[0136] S5. Calculate virtual image distance: After receiving the disparity data, the processing unit will start the built-in eye-tracking algorithm (ET algorithm) and accurately calculate the virtual image distance applicable to the current user's disparity based on the preset correspondence between disparity and virtual image distance.

[0137] S6. Adjusting the lens position: Subsequently, the virtual image distance information calculated in S5 is sent to a dedicated control component. The control component is then activated to control the first lens 31 and the second lens 32 in the zoom lens group 3 to slide relative to each other in a direction perpendicular to the optical axis until the sliding distance is within a set distance. Then, the virtual image distance corresponding to the current sliding distance is taken as the virtual image distance that matches the wearer's vision.

[0138] Through the above steps, the optical display system can automatically and efficiently adapt the lens position to best suit the user's vision, thereby significantly improving the wearing comfort and visual experience of smart head-mounted devices.

[0139] This method, which displays vision test images and allows wearers to select clearly identifiable symbols, quickly provides preliminary vision information. It is not only simple and fast but also offers wearers a more personalized service experience.

[0140] In this application, when performing vision tests on the wearer's eyes, the left and right eyes are tested separately. When testing the left eye, the right eye sees a black image, and when testing the right eye, the left eye sees a black image.

[0141] See some examples in this application. Figure 1 The imaging component 2 is a folded optical path lens module.

[0142] A folded optical path refers to the process of reflecting or refracting light multiple times through mirrors, prisms, or other optical elements, thereby changing the direction of light propagation and creating a fold in the optical path in space. This design can effectively reduce the overall length of the optical system while maintaining or optimizing image quality.

[0143] See Figure 1 The imaging component 2 is designed as a folded optical path lens module. The folded optical path lens module can fold the optical path to reduce the size and weight of the optical display system of this application, while maintaining or improving the imaging quality.

[0144] See some examples in this application. Figure 1 The imaging assembly 2 includes at least one lens arranged along the optical axis, as well as a reflective polarizer 22, a phase delayer 23 and a beam splitter 24, wherein the phase delayer 23 is located between the reflective polarizer 22 and the beam splitter 24.

[0145] The imaging assembly 2 includes not only a lens, but also a reflective polarizer 22, a phase retarder 23, and a beam splitter 24. The arrangement of these elements is specifically designed so that the phase retarder 23 is located between the reflective polarizer 22 and the beam splitter 24. The main function of this design is to form a folded optical path.

[0146] Among them, the reflective polarizer 22 can selectively transmit or reflect light with a specific polarization direction.

[0147] In this design, the phase retarder 23 alters the polarization state of light by introducing a specific phase difference. In a folded optical path, the phase retarder may be used to adjust the phase of reflected or transmitted light to ensure a sharp image is produced when they are recombined. Furthermore, the phase retarder may also be used to correct optical aberrations introduced by optical path folding.

[0148] Among them, the beam splitter 24 is used to separate the beam according to wavelength or other characteristics.

[0149] The combined use of the reflective polarizer 22, phase retarder 23, and beam splitter 24 enables the imaging assembly 2 to precisely control the polarization state and phase of light, thereby reducing optical aberrations and improving image contrast and sharpness. This control is crucial for ensuring high-quality imaging.

[0150] By employing a folded optical path design, the imaging component 2 can achieve the same or better imaging quality within a more compact space. This is particularly important for devices that require strict control over size and weight, such as virtual reality smart headsets.

[0151] See a specific example in this application. Figure 1The at least one lens includes a convex lens 21; the reflective polarizer 22 is a polarizing reflective film, and the reflective polarizer 22 is disposed on the surface of the convex lens 21 away from the display component 1; the phase delayer 23 is a quarter wave plate, the beam splitter 24 is a semi-transparent and semi-reflective film, and the phase delayer 23 and the beam splitter 24 are stacked and disposed together on the surface of the convex lens 21 close to the display component 1.

[0152] See Figure 1 The imaging component 2 provided in this application has the following structure: it includes a convex lens 21, and different optical films are respectively attached to the two surfaces of the convex lens 21.

[0153] The convex lens 21 serves as the main body of the imaging component 2, and is responsible for converging and magnifying the image light from the display component 1.

[0154] Among them, the reflective polarizer 22 (such as a polarizing reflective film) is attached to the side of the convex lens 21 away from the display component 1. By selectively reflecting light with a specific polarization direction, it reduces unnecessary reflection loss and improves the utilization rate of light energy.

[0155] The phase delayer 23 (such as a quarter-wave plate) and the beam splitter 24 (such as a semi-transparent and semi-reflective film) are stacked on the surface of the convex lens 21 near the display component 1. This arrangement allows the light to be converged by the convex lens and then undergo phase modulation and beam splitting in sequence, thereby achieving precise control and redistribution of the light.

[0156] A quarter-wave plate, acting as a phase delayer 23, converts linearly polarized light into circularly polarized light or vice versa by introducing a phase difference of π / 2, which helps reduce light loss during interface reflection and improves image contrast.

[0157] The semi-transparent and semi-reflective film, as a beam splitter 24, can adjust the transmittance and reflectance of light as needed, thus filtering out a portion of the light. In conjunction with the other optical elements mentioned above, it can be used to form a folded optical path.

[0158] In some examples of this application, the imaging component 2 is a Fresnel lens group.

[0159] In this example of the application, the imaging component 2 can also be designed as a Fresnel lens group. Fresnel lens groups can support a large field of view (FOV), which is crucial for VR visual experiences. A larger field of view allows users to experience a more immersive virtual environment, enhancing the overall entertainment and interactive experience.

[0160] The optical display system provided in this application embodiment cleverly utilizes the zoom lens group 3 in various optical configurations to achieve flexible and efficient imaging effects. Specifically, this solution allows for multiple combinations, each achieving the same functionality and visual effect.

[0161] Combination Method 1: Combining zoom lens group 3 with folding optical path lens module.

[0162] The zoom lens group 3 can be used in combination with a monolithic aspherical folding optical path lens module, see [link / reference]. Figure 1 .

[0163] In addition to a single-piece design, the folded optical path lens module can also be a combination of two or three aspherical lenses. Such a design can provide a higher level of optical correction, thereby further improving the image quality.

[0164] In addition, to achieve better optical performance, the lens group in the folded optical path lens module can also adopt a multi-lens bonding design, that is, multiple lenses are bonded together with special adhesive.

[0165] Combination Method 2: Combination of zoom lens group 3 and Fresnel lens group.

[0166] When the folded optical path lens module is not used, zoom lens group 3 can be directly combined with the Fresnel lens group. The Fresnel lens group can support a large field of view, which is beneficial for enhancing the sense of immersion.

[0167] All of the above combinations can automatically match the degree of myopia, improving the adaptability and comfort of the user experience. By incorporating eye-tracking technology, the optical display system can detect the wearer's visual acuity and automatically adjust the focal length of the optical display system to ensure that the image seen by the user is always clear.

[0168] In summary, the proposed solution, through a variety of optical configuration options, takes into account both the miniaturization requirements of smart head-mounted devices and ensures high-quality imaging, providing users with a more personalized and comfortable visual experience.

[0169] A significant feature of the optical display system provided in this application is its novel focusing mechanism, specifically the use of a zoom lens group 3 to dynamically adjust the focal length of the optical display system. The zoom lens group 3 is fixed to the near-eye side of the folded optical path lens module, ensuring efficient integration and compact design of the optical path. For example, the total zoom capability of the zoom lens group 3 in this application can reach 6 diopters (D), providing users with a wide range of visual adaptation.

[0170] In terms of design, the zoom lens group 3 offers high flexibility, allowing it to be constructed using two freeform surface lenses or two liquid crystal panels with different refractive index distributions. Regardless of the form, its core focusing principle relies on the relative movement of the two lenses in the direction perpendicular to the optical axis (Y direction). This design utilizes the change in the distance between the lenses to alter the refraction path of light as it passes through the lens group, thereby achieving the purpose of adjusting the focal length and matching different eye diopters.

[0171] When incident light passes through the optical display system of this application, it first undergoes preliminary optical path folding and direction adjustment via a folded optical path lens module, and then enters the zoom lens group 3. Here, the relative positional change between the two lenses directly affects the light, causing it to refract at different angles and ultimately converge on the wearer's retina to form a clear image. By precisely controlling the movement distance between the two lenses, the optical display system can quickly and accurately respond to the visual needs of different users, achieving personalized matching of vision.

[0172] According to another embodiment of this application, a smart head-mounted device is provided, the smart head-mounted device including a housing and an optical display system, the optical display system being the optical display system described above.

[0173] In some examples of this application, the smart head-mounted device is VR smart glasses;

[0174] The outer shell is an eyeglass frame, and the optical display system is configured as two, one of which is located on the left side of the eyeglass frame for the wearer's left eye, and the other of which is located on the right side of the eyeglass frame for the wearer's right eye.

[0175] In this example of the application, two optical display systems are configured and mounted on the eyeglass frame, corresponding to the wearer's left and right eyes. This ensures that each eye receives independent and accurate image information, thereby achieving a more stereoscopic and realistic visual effect. Simultaneously, combined with eye-tracking technology, the optical display systems can capture the user's eye movement trajectory and dynamically adjust according to the actual visual acuity of both eyes, providing the user with a clear field of vision and an immersive experience.

[0176] The specific implementation of the smart head-mounted device in this application can refer to the various embodiments of the optical display system described above. Therefore, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0177] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0178] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An optical display system, characterized by, The optical display system comprises a display assembly (1), an imaging assembly (2) and a zoom lens assembly (3) arranged along the same optical axis; The zoom lens assembly (3) comprises a first lens (31) and a second lens (32) arranged adjacently and spaced apart, at least one of the first lens (31) and the second lens (32) is capable of sliding in a direction perpendicular to the optical axis to adjust the virtual image distance of the optical display system, thereby adapting to the visual acuity of the wearer.

2. The optical display system of claim 1, wherein, The zoom lens assembly (3) is an Alvarez lens assembly.

3. The optical display system of claim 1, wherein, The first lens (31) and the second lens (32) are both free-form lenses. Alternatively, The first lens (31) and the second lens (32) are liquid crystal panels with different refractive index gradients.

4. The optical display system of any of claims 1-3, wherein, The first lens (31) is located on the side close to the display assembly (1), and the second lens (32) is located on the side away from the display assembly (1). The optical display system further comprises a control assembly connected to the first lens (31), the control assembly is configured to control the first lens (31) to slide relative to the second lens (32) in a direction perpendicular to the optical axis according to the visual acuity of the wearer, and when the sliding distance of the first lens (31) is within a set distance, the virtual image distance corresponding to the current sliding distance is taken as the virtual image distance matched with the visual acuity of the wearer.

5. The optical display system of claim 4, wherein, The moving range of the first lens (31) is L1, 0≤L1≤12mm.

6. The optical display system of any of claims 1-3, wherein, The first lens (31) is located on the side close to the display assembly (1), and the second lens (32) is located on the side away from the display assembly (1). The optical display system further comprises a control assembly connected to the first lens (31) and the second lens (32), respectively, the control assembly is configured to control the first lens (31) and the second lens (32) to slide relative to each other in a direction perpendicular to the optical axis according to the visual acuity of the wearer, and when the sliding distance between the first lens (31) and the second lens (32) is within a set distance, the virtual image distance corresponding to the current sliding distance is taken as the virtual image distance matched with the visual acuity of the wearer.

7. The optical display system of claim 6, wherein, The moving range of the first lens (31) and the second lens (32) is L0, 0≤L0≤6mm.

8. The optical display system of claim 1, wherein, The optical display system further comprises an eye movement tracking assembly (4); The display assembly (1) is capable of displaying a visual acuity test image, the visual acuity test image comprises a first mark or second marks of different sizes; wherein the first mark has different magnifications; The eye movement tracking assembly (4) cooperates with the display assembly (1) and is capable of determining the visual acuity of the wearer.

9. The optical display system of claim 8, wherein, When the gaze of the wearer's eye is fixed on a mark that can be clearly identified and the gaze duration reaches a preset duration, the eye movement tracking assembly (4) is used to track the gaze point position of the wearer's eye and identify the mark corresponding to the gaze point position; The optical display system further comprises a processing unit configured to determine the visual acuity of the wearer according to the identified mark and preset mapping data, wherein the mapping data reflect a corresponding relationship between visual acuity information and the mark.

10. The optical display system of claim 9, wherein, The eye movement tracking assembly (4) is located on a side of the zoom lens group (3) away from the display assembly (1); The eye movement tracking assembly (4) comprises an infrared light source (41) and an infrared camera (42).

11. The optical display system of claim 10, wherein, When the wearer's eyes gaze at the mark that can be clearly identified and the gazing time reaches a preset time, the infrared light source (41) is configured to emit infrared light to the wearer's eyes, and the infrared camera (42) is configured to capture the infrared light reflected by the wearer's eyes, so as to determine the gazing point position of the wearer's eyes.

12. The optical display system of any of claims 8-11, wherein, When the virtual image distance of the optical display system matches the visual acuity of the wearer, the eye movement tracking assembly (4) is configured to track the eye movement information of the wearer in real time; The optical display system further comprises a control assembly, and the control assembly is configured to control at least one of the first lens (31) and the second lens (32) to slide in a direction perpendicular to the optical axis to adjust the focal length of the optical display system in real time according to the eye movement information.

13. The optical display system of claim 1, wherein, The imaging assembly (2) is a folded light path lens module.

14. The optical display system of claim 13, wherein, The imaging assembly (2) comprises at least one lens arranged along the optical axis, a reflective polarizer (22), a phase retarder (23), and a light splitting element (24), and the phase retarder (23) is located between the reflective polarizer (22) and the light splitting element (24).

15. The optical display system of claim 14, wherein, The at least one lens comprises a convex lens (21); The reflective polarizer (22) is a polarized reflective film, and the reflective polarizer (22) is arranged on a surface of the convex lens (21) away from the display assembly (1); The phase retarder (23) is a 1 / 4 wave plate, the light splitting element (24) is a semi-transparent semi-reflective film, and the phase retarder (23) and the light splitting element (24) are arranged in a stack and together arranged on a surface of the convex lens (21) close to the display assembly (1).

16. The optical display system of claim 1, wherein, The imaging assembly (2) is a Fresnel lens group.

17. A smart headset, comprising: It comprises: a housing; and an optical display system, which is the optical display system according to any one of claims 1-16.

18. The smart headset of claim 17, wherein, The intelligent head-mounted device is a VR intelligent glasses; The housing is a glasses frame, and the optical display system is provided in two, one of which is arranged on the left side of the glasses frame for the left eye of the wearer, and the other of which is arranged on the right side of the glasses frame for the right eye of the wearer. The intelligent head-mounted device is a VR intelligent glasses; The housing is a glasses frame, and the optical display system is provided in two, one of which is arranged on the left side of the glasses frame for the left eye of the wearer, and the other of which is arranged on the right side of the glasses frame for the right eye of the wearer.

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