Optical display system and intelligent head-mounted device

Abstract

The embodiment of the utility model provides an optical display system and an intelligent head-mounted device. Wherein the optical display system comprises two optical waveguide lenses which are symmetrically arranged, and the two optical waveguide lenses are a first optical waveguide lens and a second optical waveguide lens which correspond to two eyes respectively; each of the first optical waveguide lens and the second optical waveguide lens comprises a substrate, a coupling-in grating and a coupling-out grating, the coupling-in grating and the coupling-out grating are arranged on the substrate, the coupling-in grating is used for coupling incident light into the substrate and enabling the light to be subjected to total reflection transmission, and the coupling-out grating is used for coupling the light out of the substrate; the grating periods of the first optical waveguide lens and the second optical waveguide lens are different, and the first optical waveguide lens and the second optical waveguide lens are configured to be capable of transmitting light of a specific wavelength or light of a specific field of view. The first optical waveguide lens and the second optical waveguide lens are matched to realize color or full-field image display.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of optical display, and more particularly, to an optical display system and a smart head-mounted device. BACKGROUND

[0002] With the development of display technology, virtual reality (VR), augmented reality (AR) or mixed reality (MR) technology has become increasingly sophisticated. VR products focus on the immersive experience brought by powerful performance, while AR and MR products emphasize portability and comfort. The core of these technologies is to transmit the graphic light emitted by the light source in front of the user's eyes through an optical system, which is currently achieved by using a head-mounted device. In particular, smart glasses have become the mainstream form of AR and MR products due to their portability.

[0003] Smart glasses solutions include prism solutions, off-axis optical solutions, Birdbath solutions, free-form surface solutions, and optical waveguide solutions, among others. The optical waveguide solution is particularly noteworthy due to its advantages such as lightness, transparency, and a large display angle range. The optical waveguide solution uses a light-transmitting substrate as a light transmission medium and modulates the light propagation angle through diffraction gratings and other elements. However, to achieve a larger field of view (FOV), better color performance, and higher brightness, it is often necessary to use a substrate with high refractive index and high density, as well as a multi-piece structure, which limits the weight of the optical waveguide. For optical waveguides, compared to glass substrates, resin substrates have low density and light weight, which is beneficial for lightweight, but their refractive index is limited, making it difficult to obtain a resin substrate with high refractive index, thereby limiting the performance of resin material optical waveguides. Therefore, how to achieve lightweight optical waveguides while ensuring performance is a problem that needs to be solved. UTILITY MODEL CONTENT

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

[0005] In a first aspect, the present application provides an optical display system. The optical display system includes two optical waveguide lenses arranged symmetrically, namely a first optical waveguide lens and a second optical waveguide lens corresponding to two eyes;

[0006] The first optical waveguide lens and the second optical waveguide lens each include a substrate and a coupling-in grating and a coupling-out grating arranged on the substrate. The coupling-in grating is used to couple incident light into the substrate and make the incident light undergo total internal reflection transmission. The coupling-out grating is used to couple the incident light transmitted in the substrate out of the substrate;

[0007] The grating periods of the first optical waveguide lens and the second optical waveguide lens are different, and the first optical waveguide lens and the second optical waveguide lens are configured to transmit light of specific wavelengths or specific fields of view, respectively, so as to realize color or full field of view image display through cooperation of the first optical waveguide lens and the second optical waveguide lens.

[0008] Optionally, the incident light includes at least two different wavelengths of light.

[0009] The first optical waveguide lens is configured to transmit at least one specific wavelength of light in the incident light.

[0010] The second optical waveguide lens is configured to transmit light of wavelengths other than the wavelength transmitted by the first optical waveguide lens.

[0011] Optionally, the incident light includes red light, green light and blue light.

[0012] The first optical waveguide lens is configured to have a larger grating period, and the second optical waveguide lens is configured to have a smaller grating period, and through the period configuration difference between the first optical waveguide lens and the second optical waveguide lens, at least one of the following light transmission modes can be realized:

[0013] The first optical waveguide lens transmits red light, and the second optical waveguide lens transmits blue light and green light.

[0014] The first optical waveguide lens transmits red light and green light, and the first optical waveguide lens transmits blue light.

[0015] Optionally, the incident light includes any two of red light, green light and blue light.

[0016] The first optical waveguide lens is configured to have a larger grating period, and the second optical waveguide lens is configured to have a smaller grating period, and through the period configuration difference between the first optical waveguide lens and the second optical waveguide lens, at least one of the following light transmission modes can be realized:

[0017] The first optical waveguide lens transmits red light, and the second optical waveguide lens transmits green light.

[0018] The first optical waveguide lens transmits green light, and the first optical waveguide lens transmits blue light.

[0019] The first optical waveguide lens transmits red light, and the first optical waveguide lens transmits blue light.

[0020] Optionally, one of the first optical waveguide lens and the second optical waveguide lens is configured to transmit light of a first partial field of view constituting a complete field of view image.

[0021] The other of the first optical waveguide lens and the second optical waveguide lens is configured to transmit light rays constituting a second partial field of view of a same complete field of view image;

[0022] Wherein, the light rays of the first partial field of view and the light rays of the second partial field of view are spatially adjacent or at least partially coincide, and when they are observed simultaneously by the two eyes, a complete field of view image can be formed by splicing in the two eyes.

[0023] Optionally, the sum of vectors of the in-coupling grating and the out-coupling grating on the first optical waveguide lens is zero; and

[0024] The sum of vectors of the in-coupling grating and the out-coupling grating on the second optical waveguide lens is zero.

[0025] Optionally, the substrate is further provided with a turning grating, which is located between the light paths of the in-coupling grating and the out-coupling grating, and is used to turn the direction of the light rays coupled into the substrate by the in-coupling grating and transmit to the out-coupling grating.

[0026] Optionally, the sum of vectors of the in-coupling grating, the turning grating and the out-coupling grating on the first optical waveguide lens is zero; and

[0027] The sum of vectors of the in-coupling grating, the turning grating and the out-coupling grating on the second optical waveguide lens is zero.

[0028] Optionally, the optical display system further comprises a first light machine and a second light machine;

[0029] The first light machine corresponds to the first optical waveguide lens;

[0030] The second light machine corresponds to the second optical waveguide lens;

[0031] Wherein, the wavelength and the field of view of the light rays emitted by the first light machine match the grating period on the first optical waveguide lens, and the wavelength and the field of view of the light rays emitted by the second light machine match the grating period on the second optical waveguide lens.

[0032] Optionally, the refractive index of the substrate is greater than 1.9.

[0033] In a second aspect, the present application provides a smart head-mounted device, comprising:

[0034] A housing; and

[0035] The optical display system as described in the first aspect.

[0036] The beneficial effects of the present application are:

[0037] The embodiment of the present application provides an optical display system, which is a binocular display system, by designing two symmetrically arranged optical waveguide glasses, i.e., a first optical waveguide glass and a second optical waveguide glass corresponding to the two eyes, and setting different grating periods of the two, full-color or two-color image display in a conventional field of view range or monochromatic image display in a large field of view range can be realized on a substrate material with a relatively low refractive index; meanwhile, on a substrate material with a refractive index higher than 1.9, full-color or two-color image display in a large field of view range can also be realized; in addition, each optical waveguide glass adopts a single-layer design, which not only simplifies the system structure, but also significantly reduces the overall weight of the system, improves the wearing comfort, effectively reduces the burden of the user even if the glasses are worn for a long time, and ensures excellent user experience.

[0038] Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, which is to be taken in conjunction with the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments of the present specification and, together with the description, serve to explain the principles of the present specification.

[0040] Figure 1 One of the structural schematic diagrams of the optical display system provided by the embodiment of the present application;

[0041] Figure 2 The second structural schematic diagram of the optical display system provided by the embodiment of the present application;

[0042] Figure 3 The light transmission vector diagram of a traditional diffractive optical waveguide (the glass substrate has a refractive index of 2.0);

[0043] Figure 4 The light transmission vector diagram of the optical display system provided by the embodiment of the present application;

[0044] Figure 5 The second light transmission vector diagram of the optical display system provided by the embodiment of the present application;

[0045] Figure 6 The third light transmission vector diagram of the optical display system provided by the embodiment of the present application;

[0046] Figure 7 The fourth light transmission vector diagram of the optical display system provided by the embodiment of the present application.

[0047] Explanation of reference signs:

[0048] 1, first optical waveguide glass; 2, second optical waveguide glass; 3, substrate; 4, in-coupling grating; 5, out-coupling grating; 6, turning grating. DETAILED DESCRIPTION

[0049] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, the numerical expressions, and the numerical values set forth in these embodiments are not limiting to the scope of the present application unless specifically stated otherwise.

[0050] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application, its application, or uses.

[0051] Techniques and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0052] In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0053] It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0054] The optical display system and the smart head-mounted device provided by the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0055] According to one embodiment of the present application, an optical display system is provided, referring to Figure 1 , the optical display system comprises two symmetrical light waveguide lenses, i.e., a first light waveguide lens 1 and a second light waveguide lens 2 corresponding to two eyes, respectively; the first light waveguide lens 1 and the second light waveguide lens 2 each comprise a substrate 3 and a coupling-in grating 4 and a coupling-out grating 5 arranged on the substrate 3, the coupling-in grating 4 is used for coupling incident light into the substrate 3 and making the incident light undergo total reflection transmission, and the coupling-out grating 5 is used for coupling the incident light transmitted in the substrate 3 out of the substrate 3; the grating periods of the first light waveguide lens 1 and the second light waveguide lens 2 are different, and the first light waveguide lens 1 and the second light waveguide lens 2 are configured to be able to transmit light of a specific wavelength or light of a specific field of view, respectively, so as to realize color or full field of view image display through cooperation of the first light waveguide lens 1 and the second light waveguide lens 2.

[0056] The optical display system provided by the embodiments of the present application is characterized in that two specially designed light waveguide lenses, i.e., a first light waveguide lens 1 and a second light waveguide lens 2 corresponding to two eyes, are adopted. The key feature of these two lenses lies in the significant difference in their grating period configurations.

[0057] Specifically, the grating periods of the in-coupling grating 4 and the out-coupling grating 5 on the first optical waveguide lens 1 and the second optical waveguide lens 2 are different from each other. This design makes the two optical waveguide lenses have different functions, and can process light of different wavelengths, for example.

[0058] Further, when both of the optical waveguide lenses contain turning gratings 6, as shown in Figure 2 the grating periods of the turning gratings 6 on the two optical waveguide lenses also present differences. That is, the grating period of the turning grating 6 on the first optical waveguide lens 1 is different from the grating period of the turning grating 6 on the second optical waveguide lens 2.

[0059] By configuring the first optical waveguide lens 1 and the second optical waveguide lens 2 with different grating periods, the difference in grating periods allows the two optical waveguide lenses to transmit light of specific wavelengths or light of specific fields of view, respectively.

[0060] By configuring the first optical waveguide lens 1 and the second optical waveguide lens 2 with different grating periods, the strategy of color-separated transmission can be realized.

[0061] For example, the first optical waveguide lens 1 can be configured to have a larger grating period and be responsible for transmitting red light (R light); correspondingly, the second optical waveguide lens 2 is configured to have a smaller grating period and be responsible for transmitting blue light (B light) and green light (G light). The advantage of this configuration is that it allows each color (or wavelength) of light to be transmitted through the respective optimized optical waveguide lens. By optimizing each color (or wavelength) of light separately, the overall color performance and image quality can be improved. At the same time, this color-separated transmission strategy also provides strong support for realizing large-field-of-view full-color display.

[0062] In summary, the color-separated transmission strategy based on different grating period configurations not only improves the color performance and image quality of the optical display system, but also provides a new idea for the realization of full-color display.

[0063] In addition to enabling color separation transmission, the first optical waveguide lens 1 and the second optical waveguide lens 2 can also function in expanding the field of view due to their different grating periods. Specifically, by configuring the two optical waveguide lenses with different grating periods, they can each be responsible for transmitting light of a specific field of view. In this division of labor mode, the first optical waveguide lens 1 is configured, for example, to have a larger grating period to accommodate and transmit light of a certain range or direction of the field of view, such as light on one side or at a specific angle; the second optical waveguide lens 2 can be configured to have a smaller grating period to transmit light of another range or direction of the field of view, complementary to the first optical waveguide lens 1.

[0064] This configuration allows the two optical waveguide lenses to work together, thereby expanding the field of view FOV of the entire optical display system. This feature is particularly important for augmented reality (AR) or mixed reality (MR) applications, which often need to provide users with immersive and wide visual experiences. Through this grating period configuration strategy, the entire optical display system can significantly improve the user's visual enjoyment and interactive experience without adding extra weight or cost.

[0065] In the optical display system provided in the embodiments of the present application, the first optical waveguide lens 1 and the second optical waveguide lens 2 are configured to transmit light of different wavelengths (for example, the first optical waveguide lens 1 corresponding to the left eye transmits red light, and the second optical waveguide lens 2 corresponding to the right eye transmits blue-green light) or light of different fields of view (for example, the first optical waveguide lens 1 corresponding to the left eye transmits the upper right field of view, and the second optical waveguide lens 2 corresponding to the right eye transmits the lower left field of view). Through the matching of different grating periods, the optical display system can realize color display or full-field image display.

[0066] The different grating period designs adopted by the first optical waveguide lens 1 and the second optical waveguide lens 2 bring many performance improvements to the entire optical display system. Specifically, this specially configured grating period can greatly reduce the loss of light during its propagation in the substrate 3 of the optical waveguide lens. By reasonably designing the grating periods of different optical waveguide lenses, it can ensure that light is transmitted in a more efficient manner within the corresponding substrate 3, thereby improving the utilization of light and the overall transmission efficiency.

[0067] Moreover, this differentiated grating period design of the two optical waveguide lenses also plays a positive role in improving optical performance. It can effectively reduce the occurrence of optical distortion and reduce the distortion problems that may occur during image transmission. This means that the images observed by the user will have higher clarity and realism, thereby greatly improving the quality of the visual experience.

[0068] Therefore, the grating period difference design of the first optical waveguide lens 1 and the second optical waveguide lens 2 not only optimizes the light transmission efficiency, but also significantly improves the optical performance, bringing users a clearer and more realistic visual experience.

[0069] In addition, the different grating period configurations of the first optical waveguide lens 1 and the second optical waveguide lens 2 make the optical display system provided by the embodiments of the present application have higher adaptability and flexibility, which can be customized according to different application scenarios and needs. For example, when used underwater, the configuration of transmitting blue light and green light can be selected to improve visibility and clarity. In other scenarios that require more information display dimensions, a dual-color or full-color configuration can be selected.

[0070] The field of view of a traditional diffractive optical waveguide device is limited by the refractive index of the substrate.

[0071] The optical display system provided by the embodiments of the present application can achieve a large field of view of an unconventional diffractive optical architecture through the division and cooperation of the first optical waveguide lens 1 and the second optical waveguide lens 2, even without changing the refractive index of the substrate. This means that using conventional high refractive index materials (such as refractive index > 1.9), such as high refractive optical glass, high refractive optical ceramic, lithium niobate, silicon carbide, etc., can achieve a larger field of view.

[0072] Since the first optical waveguide lens 1 and the second optical waveguide lens 2 process different light (wavelength or field of view) respectively, the optical display system provided by the embodiments of the present application can optimize the light transmission in each optical waveguide lens, reduce crosstalk and loss. This makes the optical display system improve the display performance and color performance while maintaining portability and comfort.

[0073] Compared with the traditional method of using a double-layer or triple-layer waveguide architecture, the optical solution provided by the embodiments of the present application simplifies the structure, reduces the production cost and overall weight (single-layer substrate structure). This makes the optical display system have higher application potential in head-mounted devices such as augmented reality glasses and mixed reality glasses.

[0074] The embodiment of the present application provides a binocular optical display system, the optical display system can realize full-color or double-color image display in a conventional field of view range or single-color image display in a large field of view range on a substrate material with a relatively low refractive index by designing two symmetrically arranged optical waveguide lenses, i.e., a first optical waveguide lens and a second optical waveguide lens corresponding to the binoculars and setting different grating periods of the two optical waveguide lenses; meanwhile, the optical display system can also realize full-color or double-color image display in a large field of view range on a substrate material with a refractive index higher than 1.9; in addition, each optical waveguide lens is designed as a single layer, which not only simplifies the system structure but also significantly reduces the overall weight of the system and improves the wearing comfort, so that the burden on the user can be effectively reduced even if the user wears the optical display system for a long time, and excellent user experience is ensured.

[0075] It should be noted that the allocation mode of the first optical waveguide lens 1 and the second optical waveguide lens 2 is flexible. Specifically, the two optical waveguide lenses can be exchanged according to actual application requirements. For example, in one configuration, the first optical waveguide lens 1 can be designed to correspond to the left eye of the user, and the second optical waveguide lens 2 corresponds to the right eye of the user. In another configuration, the first optical waveguide lens 1 can correspond to the right eye of the user, and the second optical waveguide lens 2 can correspond to the left eye of the user.

[0076] In some examples of the present application, the incident light rays include at least two different wavelengths of light rays; the first optical waveguide lens 1 is configured to transmit at least one specific wavelength of light rays in the incident light rays; and the second optical waveguide lens 2 is configured to transmit other wavelengths of light rays in the incident light rays except the wavelength transmitted by the first optical waveguide lens 1.

[0077] The incident light rays include at least two different wavelengths of light rays. Specifically, the incident light rays can include but are not limited to different colors of light rays such as red light, green light, blue light and the like, which can be used to realize full-color display in augmented reality (AR / MR) display technology.

[0078] In the optical display system provided by the embodiment of the present application, the first optical waveguide lens 1 is configured to transmit at least one specific wavelength of light rays in the incident light rays, and the second optical waveguide lens 2 is configured to transmit other wavelengths of light rays in the incident light rays except the wavelength transmitted by the first optical waveguide lens 1. In one example, the first optical waveguide lens 1 is used to transmit red light, and the second optical waveguide lens 2 is used to transmit blue light and / or green light. It should be noted that the way in which the optical display system of the present application transmits light rays is not limited to this example.

[0079] Of course, the first optical waveguide lens 1 and the second optical waveguide lens 2 can also be interchanged in design, that is, the first optical waveguide lens 1 is used to transmit blue light and / or green light, and at this time, the second optical waveguide lens 2 is used to transmit red light.

[0080] Since the different configurations of the grating period will affect the transmission of light rays of different wavelengths, the first optical waveguide lens 1 and the second optical waveguide lens 2 are designed to have different grating period configurations to adapt to the wavelengths of light rays they need to transmit.

[0081] By assigning different wavelengths of light rays to the first optical waveguide lens 1 and the second optical waveguide lens 2 for transmission, the optical display system provided in the embodiments of the present application realizes the imaging function by using the binocular division and cooperation. Such design in the present application not only helps to realize full-color display, but also can expand the field of view (FOV) by optimizing the performance of each optical waveguide lens.

[0082] By assigning different wavelengths of light rays to the first optical waveguide lens 1 and the second optical waveguide lens 2 for transmission, the optical display system provided in the embodiments of the present application realizes the imaging function by using the binocular division and cooperation. Such design in the present application not only helps to realize full-color display, but also can expand the field of view (FOV) by optimizing the performance of each optical waveguide lens.

[0083] In some examples of the present application, referring to Figure 4 , the incident light rays include red light, green light and blue light; the first optical waveguide lens 1 is configured to have a larger grating period, and the second optical waveguide lens 2 is configured to have a smaller grating period, and the difference in period configuration of the first optical waveguide lens 1 and the second optical waveguide lens 2 can realize at least one of the following light transmission modes: the first optical waveguide lens 1 transmits red light, and the second optical waveguide lens 2 transmits blue light and green light; the first optical waveguide lens 1 transmits red light and green light, and the first optical waveguide lens 1 transmits blue light.

[0084] In discussing the full-color display performance of the diffractive optical waveguide, the substrate of the 2.0 refractive index glass material is taken as a specific example for analysis, and the limit of the diffractive optical waveguide can achieve moderate performance under the requirements of 30° FOV and full-color. The light transmission vector diagram is shown in Figure 3 As can be seen from Figure 3 , when the requirement is 30° FOV, the ability of the diffractive optical waveguide (with a substrate of refractive index glass material) to realize full-color display has reached a limit state.

[0085] With the development of technology and the improvement of demand, 30° FOV has been unable to meet the pursuit of large field of view by users. The traditional solution is to use a double-layer or even triple-layer optical waveguide structure to increase the field of view, but this method not only increases the overall weight, but also may introduce a series of other problems, such as increased manufacturing difficulty, rising cost and decreased optical performance.

[0086] In the face of the requirement of 30° FOV, the ability of traditional single-layer diffractive optical waveguide to achieve full-color display has indeed reached a state of extreme limit. If you want to further widen the field of view or pursue more outstanding performance, one way is to increase the refractive index of the substrate. However, this design often brings an increase in the cost of optical waveguide lens production and the overall weight. In other words, in order to obtain a larger field of view or better display effect, the cost of production and the weight increase have to be paid. This limits the widespread use and user experience of diffractive optical waveguide in augmented or mixed reality applications to some extent.

[0087] In view of these problems, the embodiments of the present application propose a new solution. Through the division and cooperation of binocular function, that is, the first single-layer optical waveguide lens 1 and the second single-layer optical waveguide lens 2 adopt different grating period configurations, and through the combination of the two, a large field of view far beyond the conventional architecture is achieved.

[0088] Specifically, the first optical waveguide lens 1 can be used to transmit, for example, red light, while the second optical waveguide lens 2 transmits blue and green light. Referring to Figure 4 Under this grating period configuration, the optical waveguide lens with a 2.0 refractive index substrate can perform very well under a 30° FOV, not only can easily cope with the full-color display demand within this field of view, but also has further optimization space.

[0089] More importantly, through the configuration of the present application, the optical display system can even achieve a FOV of up to 50°, please refer to Figure 5 This means that without increasing the refractive index of the substrate, without significantly increasing the cost of the optical waveguide lens and the overall weight, the optical solution provided by the embodiments of the present application realizes a significant expansion of the field of view. This is of great significance for augmented or mixed reality glasses and other applications, because it not only improves the user's visual experience, but also reduces the production cost and weight of the product.

[0090] In this example of the present application, by cooperating the first optical waveguide lens 1 and the second optical waveguide lens 2 corresponding to the left and right eyes to transmit red, green and blue three primary color lights respectively, full-color display can be achieved. This is an important function in augmented or mixed reality glasses, because full-color display can provide a richer and more realistic visual experience.

[0091] Since the first optical waveguide lens 1 and the second optical waveguide lens 2 adopt different grating period configurations, this design can expand the field of view through binocular cooperation without increasing the refractive index of the substrate. Please continue to refer to Figure 5The design of the present application can achieve a large field of view far beyond the conventional architecture, for example, a field of view angle of 50° or more.

[0092] In some examples of the present application, the incident light rays include any two of red, green and blue light; the first optical waveguide lens 1 is configured to have a larger grating period, and the second optical waveguide lens 2 is configured to have a smaller grating period. By virtue of the period configuration difference between the first optical waveguide lens 1 and the second optical waveguide lens 2, at least one of the following light transmission modes can be achieved: the first optical waveguide lens 1 transmits red light, and the second optical waveguide lens 2 transmits green light; the first optical waveguide lens 1 transmits green light, and the first optical waveguide lens 1 transmits blue light; and the first optical waveguide lens 1 transmits red light, and the first optical waveguide lens 1 transmits blue light.

[0093] It should be noted that the first optical waveguide lens 1 and the second optical waveguide lens 2 can be interchanged.

[0094] By optimizing the configuration of the grating period, different colors (or wavelengths) of light can be transmitted in the respective optical waveguide lenses, thereby improving the display performance of the entire optical display system.

[0095] Since the optical design scheme of the present application can support multiple color light transmission modes, the most suitable configuration mode can be selected according to the specific application scenario and requirements.

[0096] In this example of the present application, multiple light transmission mode configuration options are provided for the dual-color light transmission design, which can be adjusted according to the specific application scenario and requirements.

[0097] Specifically, the optical scheme provided in this example of the present application can effectively solve the problem of dual-color light transmission. For example, in an underwater environment, using blue and green light for display can provide better visual effects because water absorbs less of these two colors of light.

[0098] Taking a traditional diffractive optical waveguide with a 2.0 refractive index glass material as a substrate as an example, in a dual-color display mode, the limit field of view angle is about 50°. Here, for example, refers to blue-green dual color or red-green dual color, in which the field of view angle of red-green dual color is slightly smaller, about 40°; the field of view angle of blue-green dual color can reach 50°.

[0099] By using the optical scheme provided in this example of the present application, by letting the first optical waveguide lens 1 and the second optical waveguide lens 2 transmit single-color light rays respectively, transmission of any dual-color light rays with a 60° field of view can be achieved, which can be seen from Figure 6 , Figure 6For monocular schematic diagram, the optical scheme provided in this example can significantly expand the field of view angle and improve the display effect while keeping the same refractive index material.

[0100] It is worth noting that if a substrate material with a higher refractive index is used, such as a substrate material with a refractive index greater than 1.9, the optical performance of the optical display system provided in this application will be even better. This is because the refractive index is closely related to the performance of the optical waveguide lens. Higher refractive index usually means better light transmission efficiency, thus enabling a larger field of view angle.

[0101] In some examples of the present application, referring to Figure 7 , one of the first optical waveguide lens 1 and the second optical waveguide lens 2 is configured to transmit light rays constituting a first partial field of view of a complete field of view image; the other of the first optical waveguide lens 1 and the second optical waveguide lens 2 is configured to transmit light rays constituting a second partial field of view of the same complete field of view image; wherein the light rays of the first partial field of view and the light rays of the second partial field of view are adjacent or at least partially overlap in space, and when they are observed simultaneously by the binoculars, they can be spliced to form a complete full field of view image in the binoculars.

[0102] In this example of the present application, the first optical waveguide lens 1 and the second optical waveguide lens 2 can work together to build a complete field of view image. Specifically, one of the two optical waveguide lenses is configured to transmit light rays constituting a first partial field of view of a complete field of view image, and the other is configured to transmit light rays constituting a second partial field of view of the same complete field of view image.

[0103] Since the light rays of the first partial field of view and the light rays of the second partial field of view are adjacent or at least partially overlap in space, when they are observed simultaneously by the binoculars, they can be spliced to form a complete full field of view image in the binoculars. This splicing process is seamless, and users hardly notice any traces of splicing, thus ensuring the continuity and comfort of vision. In addition, since each lens is only responsible for transmitting a part of the field of view, each part can be optimized for design to improve the display effect.

[0104] With the traditional diffractive optical waveguide with a 2.0 refractive index glass material as the substrate as an example, under the conventional design, the field of view of a single color is usually limited to about 60°. However, by adopting the optical scheme of the present application, this limitation is broken. Specifically, by using the configuration of the first optical waveguide lens 1 and the second optical waveguide lens 2 in the present application to display different fields of view, through the division of the two eyes, the further expansion of the field of view of the optical display system can be realized. In this configuration, the first optical waveguide lens 1 and the second optical waveguide lens 2 are each responsible for transmitting a part of the light rays of the field of view, and when these light rays are observed by the two eyes at the same time, a complete field of view image with a range of about 90° can be spliced in the brain, see Figure 7 This super large field of view performance can be achieved even at a 2.0 refractive index, which exceeds the performance level of conventional diffractive waveguides.

[0105] It is worth mentioning that if a higher refractive index substrate material is used, such as a substrate material with a refractive index greater than 1.9, the scheme of the present application can exhibit even better performance and achieve a larger field of view display effect.

[0106] It should be noted that the scheme provided in this example (the scheme of transmitting light rays of different fields of view) includes but is not limited to monochromatic light rays, and is also applicable to light rays of two or more colors.

[0107] In some examples of the present application, see Figure 1 the sum of the vectors of the in-coupling grating 4 and the out-coupling grating 5 on the first optical waveguide lens 1 is zero; and the sum of the vectors of the in-coupling grating 4 and the out-coupling grating 5 on the second optical waveguide lens 2 is zero.

[0108] The optical display system provided in the embodiments of the present application includes two optical waveguide lenses corresponding to the left eye and the right eye respectively, namely the first optical waveguide lens 1 and the second optical waveguide lens 2. Each optical waveguide lens includes an in-coupling grating 4 and an out-coupling grating 5, and the sum of the in-coupling grating 4 and the out-coupling grating 5 of each optical waveguide lens is zero.

[0109] When the sum of the vectors of the in-coupling grating 4 and the out-coupling grating 5 on one optical waveguide lens is zero, it means that the vector changes in the transmission direction of the light rays cancel each other out when the light rays pass through the two gratings, thereby reducing the loss of light rays in the transmission process. This design helps to improve the transmission efficiency of light rays, so that more light rays can be effectively transmitted from the light source to the user's eyes, thereby enhancing the brightness and clarity of the display effect. In addition, the design of the sum of the vectors of the in-coupling grating 4 and the out-coupling grating 5 helps to maintain the stability and consistency of the light rays in the transmission process, reducing the aberration and distortion caused by the mismatch of grating vectors, which is crucial for improving the display quality of the image, ensuring that the image observed by the user is more realistic and accurate.

[0110] It should be noted that the first optical waveguide lens 1 and the second optical waveguide lens 2 both need to satisfy the sum of the respective in-coupling grating 4 and out-coupling grating 5 being zero.

[0111] In some examples of the present application, referring to Figure 2 , the substrate 3 is further provided with a turning grating 6, which is located between the light path of the in-coupling grating 4 and the out-coupling grating 5, for turning the direction of the light rays coupled into the substrate 3 by the in-coupling grating 4 and transmitting to the out-coupling grating 5.

[0112] Referring to Figure 2 , for any one of the first optical waveguide lens 1 and the second optical waveguide lens 2, the introduction of the turning grating 6 makes the light rays, after entering the inside of the substrate 3 through the in-coupling grating 4, change the transmission direction through the turning grating 6 and then be transmitted to the out-coupling grating 5. This design increases the flexibility of light transmission inside the substrate 3, so that the light rays can be transmitted according to the predetermined path, thereby meeting the specific display requirements.

[0113] Since the turning grating 6 can change the transmission direction of the light rays, the positions and parameters of the in-coupling grating 4, the out-coupling grating 5 and the turning grating 6 can be more flexibly arranged when designing the optical waveguide lens. This helps to optimize the overall structure layout of the optical waveguide lens, making it more compact and efficient.

[0114] In some examples of the present application, referring to Figure 2 , the sum of the vectors of the in-coupling grating 4, the turning grating 6 and the out-coupling grating 5 on the first optical waveguide lens 1 is zero; and the sum of the vectors of the in-coupling grating 4, the turning grating 6 and the out-coupling grating 5 on the second optical waveguide lens 2 is zero.

[0115] Referring to Figure 2 , for any one of the first optical waveguide lens 1 and the second optical waveguide lens 2, when the sum of the vectors of the in-coupling grating 4, the turning grating 6 and the out-coupling grating 5 is zero, it means that the vector changes in the transmission direction of the light rays when passing through these three gratings are mutually offset. This ensures that the light rays can be transmitted along a stable and predetermined path inside the corresponding optical waveguide lens, without accidental deflection or scattering due to the vector effect of the gratings.

[0116] Satisfying this condition in this example of the present application helps to reduce the image distortion or aberration caused by the change in the direction of the light rays. In augmented or mixed reality applications, image quality is one of the key factors in measuring user experience. By ensuring the mutual offset of the grating vectors, the image finally projected onto the user's retina can be clearer and more accurate, thereby improving the overall display effect.

[0117] In some examples of the present application, the optical display system further comprises a first light engine and a second light engine; the first light engine corresponds to the first optical waveguide lens 1; the second light engine corresponds to the second optical waveguide lens 2; wherein the wavelength and field of view of the light emitted by the first light engine match the grating period on the first optical waveguide lens 1, and the wavelength and field of view of the light emitted by the second light engine match the grating period on the second optical waveguide lens 2.

[0118] When the wavelength and field of view of the light emitted by the light engine match the grating period on the optical waveguide lens, the light can be more effectively coupled into the optical waveguide lens. This means that fewer light rays will be scattered or lost during the coupling process, thereby improving the light coupling efficiency of the entire optical display system.

[0119] Optimized light coupling efficiency helps to improve the final display effect. Because more light can enter the optical waveguide lens and be transmitted to the user's eyes, the brightness and contrast of the image are improved. This allows the user to observe a clearer and sharper image.

[0120] Matching grating period and light wavelength can reduce the occurrence of chromatic dispersion. Chromatic dispersion refers to the different refraction angles of light rays of different wavelengths when passing through optical elements, resulting in colored stripes or blurring on the image edges. By matching the grating period and light wavelength, the direction of light can be ensured to remain stable during transmission, thereby reducing chromatic dispersion and image distortion.

[0121] Matching grating period and light wavelength helps to optimize the optical performance of the optical waveguide lens. By controlling parameters such as the period and tilt angle of the grating, the transmission efficiency and uniformity of light can be further improved. This helps to reduce light loss and image distortion, thereby improving the overall display effect.

[0122] In some examples of the present application, the refractive index of the substrate 3 is greater than 1.9.

[0123] It should be noted that the refractive index of the substrate directly determines the transmission angle range of the light in the optical waveguide lens, thereby limiting the field of view (FOV) of the entire optical display system.

[0124] In the optical display system provided in the embodiments of the present application, the refractive index of the substrate 3 of any optical waveguide lens can be designed to be greater than 1.9. This design, compared to conventional low refractive index materials, can allow light to propagate by total reflection in a larger angle range, thereby achieving a larger field of view. This is crucial for augmented or mixed reality (AR / MR) applications, as it can provide users with a wider field of view and improve immersion.

[0125] The substrate material with high refractive index can reduce the loss of light in the optical waveguide lens and improve the light transmission efficiency. This means that more light can enter the substrate 3 from the coupling-in grating 4 and be effectively emitted at the coupling-out grating 5, thereby improving the overall display brightness.

[0126] Of course, the optical display system provided by the embodiments of the present application can also use a low-refractive-index material for the substrate 3 of each optical waveguide lens, which can display full-color or two-color images within a regular field of view. In actual applications, the substrate material can be selected as needed.

[0127] In addition, in the optical display system provided by the embodiments of the present application, the substrate materials of the two optical waveguide lenses can be the same or different, and can be adjusted according to display requirements.

[0128] According to another embodiment of the present application, there is provided a smart head-mounted device, which comprises a housing and an optical display system as described above.

[0129] The specific implementation of the smart head-mounted device of the embodiments of the present application can refer to the embodiments of the optical display system described above, and therefore has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0130] In the above embodiments, the focus is on the differences between the embodiments, and the different optimization features between the embodiments can be combined to form a more optimal embodiment as long as they are not contradictory. Considering the brevity of the writing, this will not be repeated here.

[0131] Although some specific embodiments of the present application have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and are not intended to limit the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An optical display system, characterized in that, It includes two symmetrically arranged optical waveguide lenses, namely a first optical waveguide lens (1) and a second optical waveguide lens (2) corresponding to binocular vision; The first optical waveguide lens (1) and the second optical waveguide lens (2) both include a substrate (3) and a coupling grating (4) and a coupling grating (5) disposed on the substrate (3). The coupling grating (4) is used to couple incident light into the substrate (3) and make the incident light undergo total reflection transmission. The coupling grating (5) is used to couple the incident light transmitted in the substrate (3) out of the substrate (3). The first optical waveguide lens (1) and the second optical waveguide lens (2) have different grating periods. The first optical waveguide lens (1) and the second optical waveguide lens (2) are configured to transmit light of a specific wavelength or light of a specific field of view, respectively, so as to realize color or full field of view image display by cooperating with the first optical waveguide lens (1) and the second optical waveguide lens (2).

2. The optical display system according to claim 1, characterized in that, The incident light includes at least two different wavelengths; The first optical waveguide lens (1) is configured to transmit light of at least one specific wavelength in the incident light; The second optical waveguide lens (2) is configured to transmit light of wavelengths other than those transmitted by the first optical waveguide lens (1) in the incident light.

3. The optical display system according to claim 2, characterized in that, The incident light includes red light, green light, and blue light; The first optical waveguide lens (1) is configured to have a large grating period, and the second optical waveguide lens (2) is configured to have a small grating period. The difference in the period configuration between the first optical waveguide lens (1) and the second optical waveguide lens (2) can achieve at least one of the following light transmission methods: The first optical waveguide lens (1) transmits red light, and the second optical waveguide lens (2) transmits blue light and green light; The first optical waveguide lens (1) transmits red light and green light, and the first optical waveguide lens (1) transmits blue light.

4. The optical display system according to claim 2, characterized in that, The incident light includes any two of red light, green light, and blue light; The first optical waveguide lens (1) is configured to have a large grating period, and the second optical waveguide lens (2) is configured to have a small grating period. The difference in the period configuration between the first optical waveguide lens (1) and the second optical waveguide lens (2) can achieve at least one of the following light transmission methods: The first optical waveguide lens (1) transmits red light, and the second optical waveguide lens (2) transmits green light; The first optical waveguide lens (1) transmits green light and the first optical waveguide lens (1) transmits blue light; The first optical waveguide lens (1) transmits red light and blue light.

5. The optical display system according to claim 1, characterized in that, One of the first optical waveguide lens (1) and the second optical waveguide lens (2) is configured to transmit light rays that constitute a first part of the field of view that forms a complete field of view image; The other of the first optical waveguide lens (1) and the second optical waveguide lens (2) is configured to transmit light rays that constitute a second part of the field of view that forms the same complete field of view image; The light rays of the first part of the field of view and the light rays of the second part of the field of view are spatially adjacent or at least partially overlap, and when they are observed by both eyes simultaneously, they can be stitched together to form a complete field of view image in both eyes.

6. The optical display system according to claim 1, characterized in that, The vector sum of the coupling grating (4) and the coupling grating (5) on the first optical waveguide lens (1) is zero; and The vector sum of the input grating (4) and output grating (5) on the second optical waveguide lens (2) is zero.

7. The optical display system according to claim 1, characterized in that, A deflection grating (6) is also provided on the substrate (3). The deflection grating (6) is located between the optical paths of the coupling-in grating (4) and the coupling-out grating (5). It is used to deflect the direction of the light rays coupled into the substrate (3) by the coupling-in grating (4) and transmit them to the coupling-out grating (5).

8. The optical display system according to claim 7, characterized in that, The vector sum of the coupling grating (4), the deflection grating (6), and the output grating (5) on the first optical waveguide lens (1) is zero; and The vector sum of the coupling grating (4), the turning grating (6) and the coupling grating (5) on the second optical waveguide lens (2) is zero.

9. The optical display system according to claim 1, characterized in that, The optical display system also includes a first optical engine and a second optical engine; The first optical engine corresponds to the first optical waveguide lens (1); The second optical engine corresponds to the second optical waveguide lens (2); The wavelength and field of view of the light emitted by the first optical engine are matched with the grating period on the first optical waveguide lens (1), and the wavelength and field of view of the light emitted by the second optical engine are matched with the grating period on the second optical waveguide lens (2).

10. The optical display system according to claim 1, characterized in that, The refractive index of the substrate (3) is greater than 1.

9.

11. A smart head-mounted device, characterized in that, include: shell; and The optical display system as described in any one of claims 1-10.

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