Eye detection device and electronic equipment

Abstract

The embodiment of the invention provides an eye detection device and electronic equipment. The device comprises a transmitting end assembly which comprises a light source and a light modulation element, and the light modulation element is configured to modulate light emitted by the light source so as to generate a patterned light beam used for forming discrete light spots on the eye; and a receiving end assembly including a camera configured to acquire an eye image including the image of the discrete light spot for creating three-dimensional topography information of the eye.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the field of eye information acquisition technology, and more particularly, to an eye detection device and an electronic device. Background Art

[0002] Mixed reality (MR) is a combination of the physical world and the digital world, enabling natural and intuitive three-dimensional (3D) interaction between people, computers, and the environment, which is usually realized based on technologies such as computer vision, graphics processing, and optical display.

[0003] The MR optical display system can transmit digital information including text, graphics, and video streams to users through a complex optical system, enabling them to obtain a more realistic, immersive, virtual-reality integrated visual experience. In actual use, the interpupillary distance (IPD) of the user's eyes, the longitudinal (also known as the Z-direction) distance from the user's eyes to the MR optical system (referred to as the exit pupil distance, ER), and the lateral (also known as the XY-direction) distance of the center of the eyeball deviating from the central axis of the optical system will all affect the display effect of the MR optical display system. In addition, eye tracking (ET) also needs to obtain relatively accurate gaze point angles and pupil position information to achieve applications such as user intention understanding and analysis, gaze point rendering, and eye movement interaction.

[0004] Therefore, obtaining accurate three-dimensional eye contour information can not only assist the MR optical display system in performing exit pupil distance, pupil distance, and wearing adjustment, but also help eye tracking obtain more accurate pose information to achieve more natural and efficient interaction perception.

[0005] Conventional eye trackers mainly work based on the principle of pupil corneal reflection. For example, a conventional eye tracker is equipped with one or more cameras for capturing images of the user's eyes. After obtaining the images, the backend algorithm can use image processing algorithms to identify the positions of the pupil center and corneal reflection center on each image to determine the pupil position. However, this conventional solution is only applicable to two-dimensional (2D) information acquisition, capable of detecting the pupil position in the XY direction, but unable to measure the exit pupil distance in the Z direction, and thus unable to generate a fine three-dimensional eye contour. Summary of the Invention

[0006] In a first aspect of the present disclosure, there is provided an eye detection device, including: a transmitting end component, including a light source and a light modulation element, the light modulation element being configured to modulate the light emitted by the light source to generate a patterned light beam for forming discrete light spots on the eye; and a receiving end component, including a camera, the camera being configured to collect an eye image including the image of the discrete light spots for creating three-dimensional topography information of the eye.

[0007] In a second aspect of the present disclosure, there is provided an electronic device including the eye detection device of the first aspect of the present disclosure.

[0008] It should be understood that the content described in this part is not intended to define the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In conjunction with the accompanying drawings and with reference to the following detailed description, the above and other features, advantages, and aspects of the embodiments of the present disclosure will become more apparent. In the drawings, the same or similar reference numerals denote the same or similar elements, where:

[0010] Figures 1 to 4 shows a schematic structural diagram of an electronic device according to some embodiments of the present disclosure;

[0011] Figure 5 shows a schematic structural diagram of a transmitting end assembly according to some embodiments of the present disclosure;

[0012] Figure 6 and Figure 7 shows a schematic diagram of the field of view angle of a patterned light beam according to some embodiments of the present disclosure;

[0013] Figure 8 and Figure 9 shows an exemplary arrangement of a photodetector according to some embodiments of the present disclosure;

[0014] Figure 10 shows a schematic structural diagram of a light modulation element according to some embodiments of the present disclosure;

[0015] Figure 11 shows a schematic structural diagram of a transmitting end assembly according to some embodiments of the present disclosure; and

[0016] Figure 12 and 13 shows a defect of a diffractive optical element according to some embodiments of the present disclosure.

[0017] DESCRIPTION OF REFERENCE NUMERALS:

[0018] 1 Transmitting end assembly;

[0019] 10 Light source;

[0020] 101 Light;

[0021] 102 Sub - light source;

[0022] 11 Light modulation element;

[0023] 111 Diffractive optical element;

[0024] 112 grating structure;

[0025] 113 patterned light beam;

[0026] 1131 first light beam field of view angle;

[0027] 1132 second field of view angle;

[0028] 114 discrete light spot;

[0029] 115 transparent conductive layer;

[0030] 116 electrode;

[0031] 12 collimating lens;

[0032] 2 receiving end assembly;

[0033] 20 camera;

[0034] 30 lens barrel;

[0035] 31 display module;

[0036] 32 lens module;

[0037] 321 semi-transmissive and semi-reflective film;

[0038] 322 quarter-wave plate;

[0039] 323 reflective polarizing film;

[0040] 33 LED;

[0041] 4 photodetector;

[0042] 51 fracture part;

[0043] 52 missing part;

[0044] 80 eye. Detailed implementation manners

[0045] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to convey the scope of the present disclosure fully to those skilled in the art.

[0046] As used herein, the term "comprising" and its variations denote open-ended inclusion, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects.

[0047] As described above, conventional eye trackers are only suitable for two-dimensional (2D) information acquisition and cannot measure the pupil distance in the Z direction, so they cannot generate a fine three-dimensional contour of the eye. Embodiments of the present disclosure provide a solution for collecting topographic information of the eye, which can obtain complete three-dimensional information of the eye. The principle of the present disclosure will be described below with reference to the accompanying drawings.

[0048] Figures 1 to 4 The schematic structural diagram of an electronic device according to some embodiments of the present disclosure is shown. The solution for collecting topographic information of the eye provided by the embodiments of the present disclosure can be implemented in Figures 1 to 4 the exemplary electronic device shown. The electronic device described herein may be a mixed reality (MR) device or other devices with an eye tracking (ET) function. In such a device, a solution for collecting topographic information of the eye can be integrated to obtain three-dimensional topographic information of the user's eye. It should be understood that the solution for collecting topographic information of the eye in the embodiments of the present disclosure can also be applied to other types of electronic devices to obtain three-dimensional topographic information of the user's eye.

[0049] As Figure 1 shown, the electronic device includes a barrel 30, a lens module 32 disposed in the barrel 30, and a display module 31 disposed on the back side of the barrel 30. The display module 31 can display digital information such as text, graphics, and video streams, and can transmit them to the user via the lens module 32. In some embodiments, a plurality of light-emitting diodes (LEDs) 33 may also be disposed on the front side of the barrel 30 to assist in implementing the eye tracking function.

[0050] As Figures 1 to 4 shown, the electronic device integrates an eye detection device, which includes a transmitting end component 1 and a receiving end component 2. The transmitting end component 1 includes a light source 10 and a light modulation element 11. The light source 10 can generate light 101 having a certain wavelength or a wavelength band. The light modulation element 11 can modulate the light 101 emitted by the light source 10 to generate a patterned light beam 113 for forming discrete light spots 114 on the eye 80. The receiving end component 2 includes a camera 20, and the camera 20 can collect an eye image including the discrete light spots 114 for creating three-dimensional topographic information of the eye.

[0051] It should be understood that in Figures 1 to 4 , only several rays of the patterned beam 113 and several light spots of the discrete light spots 114 are shown as examples to illustrate the working principle of the transmitting end assembly 1. In fact, according to the design requirements, the transmitting end assembly 1 can generate any appropriate patterned beam 11 to form any appropriate number of discrete light spots 114 on the eye 80.

[0052] In one embodiment, as Figure 1 shown, both the transmitting end assembly 1 and the receiving end assembly 2 are arranged outside the lens barrel 30. With this arrangement, the patterned beam 113 emitted by the transmitting end assembly 1 can directly irradiate the eye 80, thereby forming discrete light spots 114 on the eye 80. The eye image including the reflected image of the discrete light spots 114 can be captured by the camera 20 for creating three-dimensional topography information of the eye 80.

[0053] In the embodiments of the present disclosure, any appropriate method can be adopted to perform three-dimensional reconstruction of the eye topography based on the eye image including the reflected image of the discrete light spots 114. For example, it can be based on the three-dimensional ranging method, feature matching method, etc.

[0054] In one embodiment, as Figure 2 shown, the transmitting end assembly 1 is arranged outside the lens barrel 30, and the receiving end assembly 2 is arranged inside the lens barrel 30. With this arrangement, the patterned beam 113 emitted by the transmitting end assembly 1 can directly irradiate the eye 80, thereby forming discrete light spots 114 on the eye 80. Subsequently, the eye image including the reflected image of the discrete light spots 114 can be captured by the camera 20 via the lens module 32 for creating three-dimensional topography information of the eye 80.

[0055] In one embodiment, as Figure 3 shown, the transmitting end assembly 1 is arranged inside the lens barrel 30, and the receiving end assembly 2 is arranged outside the lens barrel 30. With this arrangement, the patterned beam 113 emitted by the transmitting end assembly 1 can pass through the lens module 32 and irradiate the eye 80, thereby forming discrete light spots 114 on the eye 80. Subsequently, the eye image including the reflected image of the discrete light spots 114 can be captured by the camera 20 for creating three-dimensional topography information of the eye 80.

[0056] In one embodiment, as Figure 4As shown, the transmitting end component 1 and the receiving end component 2 are both disposed inside the lens barrel 30. With this arrangement, the patterned light beam 113 emitted by the transmitting end component 1 can pass through the lens module 32 and irradiate the eye 80, thereby forming discrete light spots 114 on the eye 80. Subsequently, the eye image including the reflected image of the discrete light spots 114 can be captured by the camera 20 via the lens module 32 for creating three-dimensional topographic information of the eye 80.

[0057] In some embodiments, the wavelength of the light 101 emitted by the light source 10 can be in the visible light band. In other embodiments, the wavelength of the light 101 emitted by the light source 10 can be in the near-infrared band. In other embodiments, the wavelength of the light 101 emitted by the light source 10 can be in other bands, as long as discrete light spots 114 that can form an image on the eye 80 and can be captured by the camera 20 can be formed. The light 101 emitted by the light source 10 can have a specific form of image, such as sine stripes, dots, single lines, multi-lines, regular speckles, random speckles, etc.

[0058] In some embodiments, the light source 10 can include a vertical cavity surface emitting laser (VCSEL), a laser diode (LD), or a light emitting diode (LED). In other embodiments, the light source 10 can also be of other types, and these implementations also fall within the scope of the present disclosure.

[0059] In some embodiments, the light source 10 can be a surface emitting light source or an edge emitting light source. In other embodiments, the light source 10 can include a plurality of sub-light sources 102, as Figure 5 shown. Figure 5 FIG. shows a schematic structural diagram of a transmitting end component according to some embodiments of the present disclosure. Figure 5 Only a few sub-light sources 102 are shown as examples in, and in actual embodiments, the number of sub-light sources 102 can reach hundreds, thousands, or even more. The sub-light sources 102 can be arranged in any suitable form. For example, the sub-light sources 102 can be regularly arranged or irregularly arranged. The sub-light sources 102 can be arranged in a one-dimensional or two-dimensional form.

[0060] In some embodiments, the light 101 emitted by the light source 10 can be circularly polarized light or linearly polarized light.

[0061] In some embodiments, as Figures 1 to 4 shown, the light-emitting surface of the light source 10 can be spaced apart from the light modulation element 11 by a certain distance, that is, there can be a gap between the two. The light 101 emitted by the light source 10 can irradiate the light modulation element 11 via this gap. In some embodiments, as Figure 5As shown, the transmitting end component 1 further includes a collimating lens 12. The collimating lens 12 is disposed between the light source 10 and the light modulation element 11 for collimating the light 101 emitted by the light source 10 to reduce the beam emission angle. The collimating lens 12 can direct the collimated light 101 onto the light modulation element 11.

[0062] In some embodiments, the light modulation element 11 can be directly integrated on the light-emitting surface of the light source 10 to directly modulate the light field 101 emitted by the light source 10. In this way, the volume and cost of the transmitting end component 1 can be reduced.

[0063] In one embodiment, as Figure 5 shown, the light modulation element 11 includes a diffractive optical element 111. The diffractive optical element 111 can split the light 101 emitted by the light source 10 to generate a patterned beam 113.

[0064] In some embodiments, as Figure 5 shown, a series of grating structures 112 with a predetermined period and depth are provided on the incident surface of the diffractive optical element 111. The grating structures 112 can control the diffraction direction and diffraction intensity of the incident beam to achieve a specific diffractive pattern morphology. In some embodiments, the grating structures 112 are one-dimensional grating structures or two-dimensional grating structures. The one-dimensional grating structure has periodicity in one direction. The two-dimensional grating structure has periodicity in two mutually orthogonal directions.

[0065] In some embodiments, the diffractive optical element 111 can be made of resin, polycarbonate (PC), glass, or liquid crystal. It should be understood that the diffractive optical element 111 can be made of any suitable material as long as it can diffract the light 101 emitted by the light source 10 to generate a patterned beam 113.

[0066] In some embodiments, the diffractive optical element 103 is a combination of diffractive elements, which can include one layer of diffractive structure, two layers of diffractive structure, or more layers of diffractive structure. Each layer of diffractive structure can diffract the light respectively, so as to obtain the desired patterned beam 113.

[0067] In some embodiments, the light modulation element 11 can include a metasurface lens to replace the diffractive optical element 111. Using the metasurface lens, the light 101 emitted by the light source 10 can also be modulated to generate a patterned beam 113 for forming discrete light spots 114 on the eye 80.

[0068] In some embodiments, as Figures 1 to 4As shown, the receiving end component 2 can reuse the camera module used to implement the eye tracking function of the electronic device. With this arrangement, the structure of the electronic device can be simplified and the cost of the electronic device can be reduced. In some other embodiments, the receiving end component 2 can be a camera module independent of the eye tracking function of the electronic device.

[0069] In some embodiments, the transmitting end component 1 is disposed within the lens barrel 30, and the structural parameters (such as radius, surface shape, etc.) of the lens module 32 can be optimized so that the field of view angle of the patterned light beam 113 emitted by the transmitting end component 1 can be further increased after being refracted by the lens module 32. Figure 6 and Figure 7 FIG. shows a schematic diagram of the field of view angle of the patterned light beam 113 according to some embodiments of the present disclosure. As Figure 6 shown, the patterned light beam 113 has a first field of view angle 1131 before entering the lens module 32 and a second field of view angle 1132 after passing through the lens module 32. The first field of view angle 1131 of the patterned light beam 113 before reaching the lens module 32 is smaller than the second field of view angle 1132 of the patterned light beam 113 after passing through the lens module 32. In this way, the projection illumination area of the patterned light beam 113 is expanded.

[0070] In some embodiments, the lens module 32 may include at least one of a Fresnel lens, a spherical mirror group, an aspherical mirror group, and a catadioptric mirror group. It should be understood that the lens module 32 may include any suitable type of lens, and the embodiments of the present disclosure are not limited thereto.

[0071] In one embodiment, as Figure 6 shown, in the case of adopting a catadioptric mirror group, the catadioptric mirror group may include film materials such as a beam splitter (BS) 321, a reflective polarizing film (RP) 323, and a quarter-wave plate (QWP) 322.

[0072] In some embodiments, in the case of adopting a catadioptric mirror group, the properties of film materials such as the beam splitter 321, the reflective polarizing film 323, and the quarter-wave plate 322 can be optimized, such as transmittance, reflectivity, loss, phase delay amount, etc., so that a part of the patterned light beam 113 emitted by the transmitting end component 1 directly penetrates the lens module 32 and irradiates the eye 80 (as Figure 7 indicated by the solid line in), and another part of the patterned light beam 113 irradiates the eye 80 after undergoing catadioptric propagation within the lens module 32 (as Figure 7 indicated by the dashed line in). In this way, the number of light spots 114 near the eye 80 can be significantly increased, thereby more accurately determining the three-dimensional morphology of the eye 80.

[0073] Since a light source 10 such as a laser source is used as the illumination element, in order to avoid the potential safety risks that may occur when its power is too high and the irradiation pulse width time is too long, a protection mechanism can be added.

[0074] In some embodiments, the transmitting end assembly 1 is disposed in the lens barrel 30, and the electronic device may further include a photodetector 4. The photodetector 4 is disposed in the lens barrel 30 and can detect the optical signal reflected by the lens module 32. In the case where the intensity of the optical signal detected by the photodetector 4 is greater than a predetermined threshold, it can be determined that the intensity of the patterned light beam 113 emitted by the transmitting end assembly 1 is too high and there is a safety risk. Therefore, the operating parameters of the transmitting end assembly 1, such as the current, voltage, duty cycle, etc. in the light source 10, can be dynamically adjusted, thereby reducing the output power of the light source 10, and even in some cases, the light source 10 can be directly turned off. In this way, the safety of the user's eyes can be ensured.

[0075] Figure 8 and Figure 9 shows an exemplary arrangement of the photodetector 4 according to some embodiments of the present disclosure. In some embodiments, as Figure 8 shown, the photodetector 4 is disposed inside the lens module 32, that is, on the side close to the transmitting end assembly 1. In some embodiments, as Figure 9 shown, the photodetector 4 is disposed between different units of different lens modules 32. For example, the photodetector 4 can be disposed between the semi-transmissive and semi-reflective film 321 and the quarter-wave plate 322, or between the quarter-wave plate 322 and the reflective polarizing film 323.

[0076] In some embodiments, the transmitting end assembly 1 includes a power detection element for detecting the output power of the light source 10. As an example, a photodiode can be disposed in the light source 10 to detect the output power of the light source 10, avoiding the power of the light source 10 being too high and further ensuring the safety of the human eye.

[0077] In some embodiments, the distribution of the scattered light spot 114 can be detected by using the camera 20. If the energy of the emitted light spot is too concentrated or too high, the light source 10 can be turned off.

[0078] In some embodiments, a transparent conductive material can be formed on the side of the light modulation element 11 facing away from the light source 10 to detect the device state of the light modulation element 11, as Figure 10 and Figure 11 shown. Figure 10 shows a schematic structural diagram of the light modulation element 11 according to some embodiments of the present disclosure, Figure 11 shows a schematic structural diagram of the transmitting end assembly 1 according to some embodiments of the present disclosure.

[0079] In some embodiments, asFigure 10 and Figure 11 As shown, a transparent conductive layer 115 and a pair of electrodes 116 are provided on a side of the light modulation element 11 facing away from the light source 10. The light modulation element 11 is generally rectangular. One electrode 116 of the pair of electrodes 116 is provided at one corner of the light modulation element 11 and is electrically connected to one end of the transparent conductive layer 115. The other electrode 116 of the pair of electrodes 116 is provided at another corner of the light modulation element 11 and is electrically connected to the other end of the transparent conductive layer 115. These two corners of the light modulation element 11 may be two corners on the diagonal of the light modulation element 11 or two corners on one side. The transparent conductive layer 115 extends along a folded-back path between the pair of electrodes 116 and is generally bent. The transparent conductive layer 115 can be connected to the monitoring circuit through the pair of electrodes 116. When the light modulation element 11 is intact and without any damage, the electrical signal in the monitoring circuit remains stable, thereby indicating that the light modulation element 11 is in a normal working state. When the light modulation element 11 is damaged or broken, the electrical signal in the monitoring circuit will be abnormal, thereby indicating that the light modulation element 11 is in an abnormal working state. Figure 12 and 13 show defects of the diffractive optical element 11 according to some embodiments of the present disclosure. As Figure 12 shown, the light modulation element 11 has a fracture portion 51. As Figure 13 shown, the light modulation element 11 has a missing portion 52. The fracture portion 51 and the missing portion 52 cause the transparent conductive layer 115 to be disconnected. In this case, the state of the light modulation element 11 can be judged in time according to the change of the electrical signal, and the turning on and off of the light source 10 can be controlled to avoid safety risks.

[0080] In some embodiments, the transparent conductive layer 115 includes at least one of indium tin oxide (ITO) and graphene. It should be understood that other types of transparent conductive materials are also feasible, and the scope of the present disclosure is not limited thereto.

[0081] It should be understood that the bent transparent conductive layer 115 is merely an example. In other embodiments, the transparent conductive layer 115 is linear, annular, or any other available shape. As an example, the pair of electrodes 116 can be disposed at two corner portions on the diagonal of the light modulation element 11, and the transparent conductive layer 115 extends along a straight path between the pair of electrodes 116. In this case, the transparent conductive layer 115 is generally linear. As another example, the pair of electrodes 116 can be disposed at two corner portions on the diagonal of the light modulation element 11 or at two corner portions on one side of the light modulation element 11. The transparent conductive layer 115 can start from one electrode 116 and wrap inward, then wrap outward after reaching the center point, and finally reach the other electrode 116. In this case, the transparent conductive layer 115 is generally annular.

[0082] According to the embodiments of the present disclosure, complete three-dimensional information of the eye can be obtained, breaking through the limitation that traditional eye tracking solutions can only calculate two-dimensional planar topography information, and expanding more possibilities for the application of MR devices and eye tracking. In addition, according to the embodiments of the present disclosure, imaging ghosts can be reduced. Due to the collimation characteristics of the VCSEL and the diffractive optical element, the signals received on the receiving end assembly are mostly signals generated by the scattering of the eye, which has good anti-interference characteristics.

[0083] The embodiments of the present disclosure are also reflected in the following examples.

[0084] Example 1. An eye detection device, comprising: a transmitting end assembly, including a light source and a light modulation element, the light modulation element being configured to modulate the light emitted by the light source to generate a patterned light beam for forming discrete light spots on the eye; and a receiving end assembly, including a camera, the camera being configured to collect an eye image including the discrete light spots for creating three-dimensional topography information of the eye.

[0085] Example 2. The eye detection device according to Example 1, wherein the light source includes at least one of the following: a surface-emitting light source; an edge-emitting light source; and a plurality of sub-light sources.

[0086] Example 3. The eye detection device according to Example 1, wherein the transmitting end assembly includes a power detection element, the power detection element being configured to detect the output power of the light source.

[0087] Example 4. The eye detection device according to Example 1, wherein the light modulation element includes a diffractive optical element, the diffractive optical element being configured to split the light emitted by the light source to generate the patterned light beam.

[0088] Example 5. The eye detection device according to Example 4, wherein the diffractive optical element includes a grating structure having a predetermined period and depth.

[0089] Example 6. The eye detection device according to Example 5, wherein the grating structure is a one-dimensional grating structure or a two-dimensional grating structure.

[0090] Example 7. The eye detection device according to Example 4, wherein the diffractive optical element includes one or more diffractive structures.

[0091] Example 8. The eye detection device according to Example 1, wherein the light modulation element is integrated on the light-emitting surface of the light source.

[0092] Example 9. The eye detection device according to Example 1, wherein the light modulation element includes a metasurface lens.

[0093] Example 10. The eye detection device according to Example 1, wherein the transmitting end assembly further includes: a collimating lens disposed between the light source and the light modulation element and configured to collimate the light emitted by the light source and guide the collimated light onto the light modulation element.

[0094] Example 11. The eye detection device according to Example 1, wherein a transparent conductive layer and paired electrodes are disposed on a side of the light modulation element facing away from the light source, one of the paired electrodes is connected to one end of the transparent conductive layer, and the other of the paired electrodes is connected to the other end of the transparent conductive layer.

[0095] Example 12. The eye detection device according to Example 11, wherein the transparent conductive layer includes at least one of indium tin oxide and graphene.

[0096] Example 13. The eye detection device according to Example 11, wherein the transparent conductive layer is rectangular, the paired electrodes (116) are disposed at two corners of the transparent conductive layer (115), and the transparent conductive layer (115) extends along a folded-back path, a straight path, or a circumferential path between the paired electrodes (116).

[0097] Example 14. An electronic device, comprising the eye detection device according to any one of Examples 1 to 13.

[0098] Example 15. The electronic device according to Example 14, wherein the electronic device includes a lens barrel and a lens module disposed in the lens barrel, wherein the transmitting end assembly is disposed inside or outside the lens barrel, and the receiving end assembly is disposed inside or outside the lens barrel.

[0099] Example 16. The electronic device according to Example 15, wherein the transmitting end component is disposed within the lens barrel, the electronic device further includes a photodetector, the photodetector is disposed within the lens barrel, and is configured to detect an optical signal reflected by the lens module, wherein when the intensity of the optical signal is greater than a predetermined threshold, the output power of the light source is reduced or the light source is turned off.

[0100] Example 17. The electronic device according to Example 16, wherein the photodetector is disposed on a side of the lens module close to the transmitting end component, or is disposed between different units of different lens modules.

[0101] Example 18. The electronic device according to Example 15, wherein the transmitting end component is disposed within the lens barrel, a first field of view angle of the patterned light beam emitted by the transmitting end component before reaching the lens module is smaller than a second field of view angle of the patterned light beam after passing through the lens module.

[0102] Example 19. The electronic device according to Example 15, wherein the transmitting end component is disposed within the lens barrel, a part of the patterned light beam emitted by the transmitting end component directly penetrates the lens module and irradiates the eye, and another part of the patterned light beam irradiates the eye after undergoing folded propagation within the lens module.

[0103] The embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to technologies in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. An eye detection device, comprising: A transmitting end assembly (1), including a light source (10) and a light modulation element (11), the light modulation element (11) being configured to modulate the light (101) emitted by the light source (10) to generate a patterned light beam (113) for forming discrete light spots (114) on the eye; and A receiving end assembly (2), including a camera (20), the camera (20) being configured to collect an eye image including an image of the discrete light spots (114) for creating three-dimensional topographic information of the eye.

2. The eye detection device according to claim 1, wherein the light source (10) includes at least one of the following: A surface-emitting light source; An edge-emitting light source; and Multiple sub-light sources.

3. The eye detection device according to claim 1, wherein the transmitting end assembly (1) includes a power detection element configured to detect the output power of the light source (10).

4. The eye detection device according to claim 1, wherein the light modulation element (11) includes a diffractive optical element (111), the diffractive optical element (111) being configured to split the light (101) emitted by the light source (10) to generate the patterned light beam (113).

5. The eye detection device according to claim 4, wherein the diffractive optical element (111) includes a grating structure (112) having a predetermined period and depth.

6. The eye detection device according to claim 5, wherein the grating structure (112) is a one-dimensional grating structure or a two-dimensional grating structure.

7. The eye detection device according to claim 4, wherein the diffractive optical element (111) includes one or more layers of diffractive structures.

8. The eye detection device according to claim 1, wherein the light modulation element (11) is integrated on the light-emitting surface of the light source (10).

9. The eye detection device according to claim 1, wherein the light modulation element (11) includes a metasurface lens.

10. The eye detection device according to claim 1, wherein the transmitting end assembly (1) further includes: A collimating lens (12), disposed between the light source (10) and the light modulation element (11), and configured to collimate the light (101) emitted by the light source (10) and guide the collimated light (101) to the light modulation element (11).

11. The eye detection device according to claim 1, wherein a transparent conductive layer (115) and a pair of electrodes (116) are disposed on a side of the light modulation element (11) facing away from the light source (10), one electrode (116) of the pair of electrodes (116) being connected to one end of the transparent conductive layer (115), and the other electrode (116) of the pair of electrodes (116) being connected to the other end of the transparent conductive layer (115).

12. The eye detection device according to claim 11, wherein the transparent conductive layer (115) includes at least one of indium tin oxide and graphene.

13. The eye detection device according to claim 11, wherein the transparent conductive layer (115) is rectangular, the pair of electrodes (116) are disposed at two corners of the transparent conductive layer (115), and the transparent conductive layer (115) extends along a folded-back path, a straight path, or a surrounding path between the pair of electrodes (116).

14. An electronic device, comprising the eye detection device according to any one of claims 1 to 13.

15. The electronic device according to claim 14, wherein the electronic device includes a lens barrel (30) and a lens module (32) disposed in the lens barrel (30), wherein the transmitting end assembly (1) is disposed inside or outside the lens barrel (30), and the receiving end assembly (2) is disposed inside or outside the lens barrel (30).

16. The electronic device according to claim 15, wherein the transmitting end assembly (1) is disposed inside the lens barrel (30), the electronic device further includes a photodetector (4), the photodetector (4) is disposed inside the lens barrel (30), and is configured to detect an optical signal reflected by the lens module (32), wherein when the intensity of the optical signal is greater than a predetermined threshold, the output power of the light source (10) is reduced or the light source (10) is turned off.

17. The electronic device according to claim 16, wherein the photodetector (4) is disposed on a side of the lens module (32) close to the transmitting end assembly (1), or between different units of different lens modules (32).

18. The electronic device according to claim 15, wherein the transmitting end assembly (1) is disposed inside the lens barrel (30), a first field of view angle of the patterned light beam (113) emitted by the transmitting end assembly (1) before reaching the lens module (32) is smaller than a second field of view angle of the patterned light beam (113) after passing through the lens module (32).

19. The electronic device according to claim 15, wherein the transmitting end assembly (1) is disposed inside the lens barrel (30), a part of the patterned light beam (113) emitted by the transmitting end assembly (1) directly penetrates the lens module (32) and irradiates the eye, and another part of the patterned light beam (113) irradiates the eye after undergoing folded-back propagation inside the lens module (32).

Images