Eye tracking optical system and display device

Abstract

The invention provides an eye movement tracking optical system and a display device, and the system comprises a display panel module which is used for transmitting first light to human eyes; the eye movement tracking module is arranged on the light emitting side of the display panel and comprises a light reflecting unit and a light receiving unit, the light receiving unit is used for receiving second light reflected by human eyes and coupling the second light to the light receiving unit, and the light receiving unit is used for receiving the incident second light and transmitting the second light to the display panel. The first light ray and the second light ray are different light rays.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an eye tracking optical system and a display device. Background Art

[0002] At present, augmented reality (AR) and / or virtual reality (VR) systems can generate three-dimensional (3D) immersive environments. Users can interact with 3D virtual immersive environments through various display devices to experience them. Near-eye display optical systems have the characteristics of small size, light weight, and stereoscopic display, and have good development prospects.

[0003] When users watch VR and AR products, the left and right eyes can see the same scene from different perspectives, resulting in parallax. The brain then integrates the images to achieve stereoscopic display. Tracking the eye gaze point or line of sight during the display process can better adapt the eye gaze point to display the picture. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide an eye tracking optical system and a display device, which can realize eye tracking and improve user experience.

[0005] In one aspect of the present invention, the present invention provides an eye tracking optical system, comprising: a display panel module, for emitting a first light ray to a human eye; an eye tracking module arranged on a light emitting side of the display panel module, comprising a light reflecting unit and a light receiving unit, the light receiving unit being used to receive a second light ray reflected by the human eye and coupling the second light ray to the light receiving unit, the light receiving unit being used to receive an incident second light ray to achieve eye tracking, the first light ray and the second light ray being different light rays.

[0006] According to an embodiment of the present invention, the first light is a first polarized light, the second light is a second polarized light, and the polarization directions of the first polarized light and the second polarized light are perpendicular; the light reflecting unit includes a first reflection interface, the first reflection interface includes a multilayer dielectric film, and the first reflection interface is used to reflect the second polarized light and transmit the first polarized light.

[0007] According to an embodiment of the present invention, the display panel module includes a display panel and a polarizer disposed on the display panel near a light-emitting side, and the polarizer is used to convert the light of the display panel into first polarized light and emit it.

[0008] According to an embodiment of the present invention, the first reflective interface is tilted relative to the display panel, and the first reflective interface also includes a first prism and a second prism for fixing the first reflective interface, the first prism and the second prism are right-angled triangular prisms, the oblique surface of the first prism and the oblique surface of the second prism are arranged opposite to each other, and the first reflective interface is fixed on the oblique surface of the first prism or the second prism.

[0009] According to an embodiment of the present invention, the eye tracking optical system also includes: a light emitting unit, which is used to emit the second light to the human eye, and the second light is infrared light; the light emitting unit is arranged inside the display panel module or on the light output side of the display panel module.

[0010] According to an embodiment of the present invention, the light reflecting unit includes a second reflecting interface, the second reflecting interface includes a dichroic optical coating, and the second reflecting interface is used to reflect infrared light and transmit visible light.

[0011] According to an embodiment of the present invention, the second reflective interface is arranged at an angle relative to the display panel, and the light reflecting unit also includes a third prism and a fourth prism for fixing the second reflective interface, the third prism and the fourth prism are right-angled triangular prisms, the oblique surface of the third prism and the oblique surface of the fourth prism are arranged opposite to each other, and the second reflective interface is fixed on the oblique surfaces of the third prism and the fourth prism.

[0012] According to an embodiment of the present invention, the eye tracking optical system further includes: a shell, the shell including a lens barrel and a first end and a second end oppositely arranged on the lens barrel, the first end being an end close to a human eye, the display panel module being fixedly arranged at the second end, and the light receiving unit and the light reflecting unit being both fixedly arranged on the lens barrel.

[0013] According to an embodiment of the present invention, a accommodating cavity for accommodating the light reflecting unit is provided on the lens barrel, and the accommodating cavity protrudes from the inner wall to the outer wall of the lens barrel, and the viewing angle between the human eye and the display panel module is less than or equal to the viewing angle between the human eye and the light reflecting unit.

[0014] According to an embodiment of the present invention, the light reflecting unit and the light receiving unit are located on the same side of the lens barrel, and the light receiving unit is fixed to the outer side of the light reflecting unit by optical adhesive.

[0015] According to an embodiment of the present invention, the light reflecting unit and the light receiving unit are located at two opposite sides of the lens barrel in the radial direction, the light receiving unit is fixedly arranged on the outer wall of the lens barrel, and the lens barrel is provided with a light-transmitting hole for the second light to pass through.

[0016] According to an embodiment of the present invention, the light reflecting unit is arranged along the circumference of the inner wall of the housing, and the orthographic projection of the light reflecting unit on the display panel module coincides with the orthographic projection of the inner wall on the display panel module.

[0017] According to an embodiment of the present invention, the eye-tracking optical system further includes: a lens module disposed between the eye-tracking module and a human eye, wherein the lens module includes at least one lens.

[0018] In another aspect of the present invention, the present invention provides a display device, comprising at least one eye tracking optical system as described above. By selecting a specific light beam by the light reflection unit, the light reflected by the human eye is collected without affecting the first light beam originally emitted by the display panel module and entering the human eye, so that the normal display requirements can be effectively met, and the user's eye tracking can be completed according to the human eye image collected by the light receiving unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of the structure of an eye tracking optical system in one embodiment of the present invention;

[0021] Figure 2 is a schematic structural diagram of an eye tracking optical system in another embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of an eye tracking optical system in another embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of an eye tracking optical system in yet another embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the structure of an eye tracking optical system in one embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of an eye tracking optical system in another embodiment of the present invention. DETAILED DESCRIPTION

[0026] The scheme of the present invention will be explained below in conjunction with embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are followed. The present invention will be described below with reference to specific embodiments, it should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0027] An embodiment of the present application provides a display device for wearing on the head of a user, and at least one eye tracking optical system is provided on the display device for implementing eye tracking. The display device may be a head-mounted display device, for example, the display device may be an electronic product that combines digital content and real scenes, such as augmented reality (AR) glasses, AR helmets, virtual reality (VR) glasses, VR helmets, mixed reality (MR) glasses, or MR helmets. The display device may also not be worn on the head. This application is specifically described by taking the display device as VR glasses as an example.

[0028] Please refer to Figure 1 As shown, an embodiment of the present invention provides an eye tracking optical system, comprising:

[0029] The display panel module 100 is used to emit a first light to a human eye 300;

[0030] The eye tracking module 200 arranged on the light emitting side of the display panel module 100 includes a light reflecting unit 210 and a light receiving unit 220. The light receiving unit 220 is used to receive the second light reflected by the human eye 300 and couple the second light to the light receiving unit 220. The light receiving unit 220 is used to receive the incident second light to realize eye tracking. The first light and the second light are different lights.

[0031] The eye tracking optical system provided in the embodiment of the present invention can effectively meet normal display requirements and complete the user's eye tracking based on the image of the human eye 300 collected by the light receiving unit 220, by collecting the light reflected by the human eye 300 through the setting of the light reflecting unit 210 for selecting specific light without affecting the first light originally emitted by the display panel module 100 and entering the human eye.

[0032] In one embodiment of the present invention, the first light is a first polarized light, the second light is a second polarized light, and the polarization directions of the first polarized light and the second polarized light are perpendicular; the light reflection unit 210 includes a first reflection interface 211, and the first reflection interface 211 is used to reflect the second polarized light and transmit the first polarized light. In each light schematic diagram of each embodiment of the present invention, the first light is represented by "·" and the second light is represented by "×".

[0033] In the present application, the first polarized light may be one of p (parallel, horizontal) polarized light and s (senkrecht, vertical) polarized light, and the second polarized light may be the other of p polarized light and s polarized light. In the embodiment of the present invention, the first polarized light is p polarized light and the second polarized light is s polarized light as an example for illustrative description. It should be clear to those skilled in the art that s polarized light refers to polarized light whose polarization direction is perpendicular to the propagation plane, and p polarized light refers to polarized light whose polarization direction is in the propagation plane.

[0034] The display panel module 100 is used to display the screen to the user. The display panel module 100 includes a display panel. The type of the display panel module 100 is not limited in the present invention. The display panel module 100 can be any one of an LCD (Liquid Crystal Display) display panel module 100, an OLED (Organic Light Emitting Diode) display panel module 100, a Micro OLED micro display panel module 100, and a Mini LED micro display panel module 100; it can also be a DLP (Digital Light Processing) display panel module 100; it can also be an LCOS (Liquid Crystal on Silicon) display panel module 100, etc. In addition, the display panel module 100 can be a flexible screen or a rigid screen (i.e., a non-flexible screen). In practical applications, it can be selected according to user needs. In the present invention, a liquid crystal display panel module 100 is used for exemplary description.

[0035] Among them, the display panel module 100 includes a polarizer 110 arranged on the display panel near the light-emitting side, and the polarizer 110 is used to convert the light of the display panel into the first polarized light and emit it. The polarizer 110 can adopt an absorption-type polarizer 110, and the transmission axis of the polarizer 110 is parallel to the polarization direction of the first polarized light. In other embodiments, other polarization conversion layers can also be used on the display panel module 100, as long as they can convert the light emitted by the display panel module 100 into the first polarized light. Stray light can be absorbed by the polarizer, especially the second polarized light incident on the polarizer is absorbed to prevent secondary reflection from being incident on the light reflecting unit 210 and being received by the light receiving unit 220, thereby affecting the eye tracking accuracy.

[0036] It can be understood that due to irregular reflection, diffuse reflection and other phenomena of the human eye 300, ambient light and other light may have first polarized light and second polarized light after being reflected by the human eye 300. In the present invention, the light reflecting unit 210 only receives the second polarized light reflected by the human eye 300 that is different from the first polarized light reflected by the display panel module 100, which can prevent the first polarized light directly emitted by the display panel module 100 or other ambient light that has been reflected multiple times from being incident on the light reflecting unit 210, and then being reflected into the light receiving unit 220 to affect the eye tracking effect or affect the display effect of the first polarized light emitted by the display panel module 100 entering the human eye 300.

[0037] In the present application, the light reflection unit 210 may adopt a polarization beam splitter (PBS). By setting a first reflection interface 211 on the PBS, the first reflection interface 211 may be a multi-layer dielectric film, which can reflect the second polarized light and transmit the first polarized light.

[0038] In the present invention, the first reflective interface 211 is tilted relative to the display panel module 100. In some embodiments, the first reflective interface 211 further includes a first prism 212 and a second prism 213 for fixing the first reflective interface 211. The first prism 212 and the second prism 213 are right-angled triangular prisms. The inclined surface of the first prism 212 and the inclined surface of the second prism 213 are arranged opposite to each other, and the first reflective interface 211 is fixed on the inclined surface of the first prism 212 or the second prism 213. The first prism 212 and the second prism 213 can be high-precision right-angle prisms, fixed by gluing, and the first reflective interface 211 with a multi-layer dielectric film coated on the hypotenuse of one of the prisms. According to the different positions of the light reflecting unit 210, the angle between the light reflecting unit 210 and the display panel module 100 can be set differently.

[0039] The first prism 212 is disposed on a side close to the human eye 300, and the second prism 213 is disposed on a side close to the display panel module 100. The first reflective interface 211 can transmit the first polarized light and reflect the second polarized light. The lower surface (a right angle surface) of the second prism 213 is the light incident surface of the first polarized light emitted by the display panel module 100. After entering the second prism 213, the light passes through the inclined surface and is transmitted from the upper surface (a right angle surface) of the first prism 212. The upper surface of the first prism 212 is the light incident surface of the second polarized light reflected by the human eye 300. After entering the first prism 212, the light is totally reflected on the first reflective interface 211 of the inclined surface and is coupled out from the light exit surface (another right angle surface) of the first prism 212 to the light receiving unit 220. It should be noted that the first reflective interface 211 can be a multilayer dielectric film or can also be any grating or a combination of several gratings such as a surface relief grating, a volume holographic grating, a controllable nano grating (such as a liquid crystal grating, a polymer dispersed liquid crystal (PDLC) grating), etc. The specific selection can be determined according to actual conditions, and the embodiments of the present invention are not limited to this.

[0040] Please refer to Figure 2 In another embodiment of the present invention, the eye tracking optical system further includes: a light emitting unit 240, the light emitting unit 240 is used to emit a second light to the human eye 300, and the second light is infrared light; the light emitting unit 240 is arranged inside the display panel module 100 or on the light emitting side of the display panel module 100.

[0041] The light emitting unit 240 provided in the embodiment of the present invention is selected as an infrared light source to send infrared light to the human eye 300, which can avoid affecting the visual effect of the eye. It is understandable that, under appropriate circumstances, invisible light within other wavelength ranges can also be selected as the second light.

[0042] The light emitting unit 240 provided in the embodiment of the present invention may include at least one light source; when the light source device includes multiple light sources, the multiple light sources may be arranged in a preset manner, such as arranged in a herringbone manner, arranged in a straight line manner, etc. The light emitting unit 240 may be prepared on the display panel module 100, and may also be installed on the shell 400, and the present invention does not make any specific restrictions on this.

[0043] It is understandable that in some embodiments, the visible light emitted by the display panel module 100 can be directly used for display without providing the polarizer 110. Figure 1Unlike the display panel module 100 shown, the display panel module 100 in this embodiment does not include a polarizer 110, so the first light can be visible light. It should be noted that the display panel module 100 can also include a polarizer 110, which is a circular polarizer to eliminate surface reflections and improve display effects, and a linear polarizer, and the first light can be polarized light, such as p-polarized light or s-polarized light, or a combination of a linear polarizer and a circular polarizer, to match the optical lens architecture of the folded light path. In the implementation of the present invention, the first light is visible light and the second light is infrared light for exemplary description.

[0044] Correspondingly, the light reflecting unit 210 includes a second reflective interface 214, and the second reflective interface 214 includes a dichroic optical coating for reflecting infrared light and transmitting visible light; the light receiving unit 220 can be an infrared sensor; for example, a CCD sensor or a CMOS sensor.

[0045] In the present invention, the second reflective interface 214 is arranged to be inclined relative to the display panel module 100, so as to realize the re-reflection of the light reflected by the human eye 300 into the light receiving unit 220. In some embodiments of the present invention, the light reflecting unit 210 further includes a third prism 215 and a fourth prism 216 for fixing the second reflective interface 214, the third prism 215 and the fourth prism 216 are right-angled triangular prisms, the inclined surface of the third prism 215 and the inclined surface of the fourth prism 216 are arranged opposite to each other, and the second reflective interface 214 is fixed on the inclined surfaces of the third prism 215 and the fourth prism 216.

[0046] The third prism 215 is disposed on a side close to the human eye 300, and the fourth prism 216 is disposed on a side close to the display panel module 100. The second reflective interface 214 can transmit visible light and reflect infrared light. The lower surface (a right angle surface) of the fourth prism 216 is the light incident surface of the visible light emitted by the display panel module 100. After entering the fourth prism 216, the visible light passes through the inclined surface and is transmitted from the upper surface (a right angle surface) of the third prism 215; the upper surface of the third prism 215 is the light incident surface of the infrared light reflected by the human eye 300. After entering the third prism 215, the infrared light is totally reflected on the second reflective interface 214 of the inclined surface and is coupled out from the light exit surface (another right angle surface) of the third prism 215 to the light receiving unit 220.

[0047] The second reflective interface 214 may be made of a material that can reflect infrared light and transmit visible light (e.g., has high transmittance to visible light) so as not to affect the user's viewing of the display panel module 100 through the prism. The material of the second reflective interface 214 may be a transparent dielectric material with a dichroic optical coating that can transmit visible light and reflect infrared light, such as TiO2, SiO2, or a laminate thereof. By way of example, the second reflective interface 214 may be formed on the surface of the prism by an evaporation or sputtering process.

[0048] The eye tracking optical system provided by the present invention also includes a shell 400 for fixing the display panel module 100, the light reflecting unit 210 and the light receiving unit 220. The shape and structure of the shell are not limited in the embodiment of the present application. In different embodiments, depending on the application scenario, the shell can be in the shape of a lens barrel 410, a glasses shape, etc. The lens barrel 410 is used as an example for description in the present application.

[0049] Exemplarily, the housing 400 may include a lens barrel 410, which surrounds and forms a sight channel, and the lens barrel 410 includes a first end 411 and a second end 412 that are relatively arranged, wherein the first end 411 is an end close to the human eye, that is, the human eye field end; the display panel module 100 is fixedly arranged on the second end 412, and two lens barrels 410 are used for exemplary description in the present invention, and two sight channels are formed by the two lens barrels 410, which are used for the left eye and the right eye to watch the picture presented by the display panel module 100. In some embodiments, the two lens barrels 410 can share the same wall surface at adjacent positions. The housing 400 can be an integrated structure to ensure the overall strength of the housing 400. Among them, the material of the housing 400 includes but is not limited to metal, plastic, resin or natural material, etc.

[0050] It is understandable that in the present invention, two eye-tracking optical systems may be provided on the housing 400 for eye tracking of the left eye and the right eye respectively, and each of the two eye-tracking optical systems may have a display panel module 100, or the two eye-tracking optical systems may share a display panel module 100. In other embodiments, the structures of the two eye-tracking optical systems may also share other optical elements, such as the light reflection unit 210 or the light emission unit 240. In addition, the structures of the two eye-tracking optical systems may also be different, and this application does not specifically limit this.

[0051] The light receiving unit 220 and the light reflecting unit 210 are fixedly disposed on the wall surface between the first end 411 and the second end 412 of the lens barrel 410. It is understandable that the light receiving unit 220 and the light reflecting unit 210 can be disposed at any height position of the lens barrel 410, and those skilled in the art can adjust the fixed positions of the light receiving unit 220 and the light reflecting unit 210 as needed.

[0052] It should also be noted that the directional terms such as "inside" and "outside" used in this application are mainly described based on the location of the human eye 300 when the display device is worn on the user's head, with the area close to the human eye 300 being the inside and the area far from the human eye 300 being the outside. The "inner wall 402 of the lens barrel 410" described in this application refers to the wall surface of the lens barrel 410 surrounding the visual channel.

[0053] When set, the light reflection unit 210 is set on the inner wall 402 of the lens barrel 410 to receive the second light reflected by the human eye. Figure 3 As shown, the lens barrel 410 is provided with a receiving cavity 420 for receiving the light reflecting unit 210, and the receiving cavity 420 protrudes from the inner wall of the lens barrel 410 to the outer wall 403, and the viewing angle between the human eye 300 and the display panel module 100 is less than or equal to the viewing angle between the human eye 300 and the light reflecting unit 210. In this way, the optical display device can be simplified, the volume and weight of the overall optical display system can be reduced, and eye tracking can be achieved without affecting the normal display; the size and weight of the overall head-mounted display device can be reduced, and the wearing experience can be improved.

[0054] In order to increase the viewing angle between the human eye 300 and the display panel 100 module, the lens barrel 410 includes at least a portion of the inner wall 402 near the second end 412 provided with an inclined wall surface, and the inclined direction is inclined outwardly in the direction close to the second end 412, so that the viewing angle can be increased outwardly; in addition, the accommodating cavity 420 can be arranged on the inclined wall surface, so that the viewing angle between the human eye 300 and the light reflecting unit 210 can also be increased outwardly. Since the height of the accommodating cavity 420 on the inner wall 402 is closer to the human eye, the viewing angle between the human eye 300 and the display panel module 100 is smaller than the viewing angle between the human eye 300 and the light reflecting unit 210, and eye tracking can be achieved without affecting the normal display.

[0055] The light receiving unit 220 may be located on the same side or opposite side as the light reflecting unit 210 in the radial direction of the lens barrel 410 . Figure 3 4 shows that the light receiving unit 220 and the light reflecting unit 210 are located on the same side of the inner wall of the lens barrel 410, and the light receiving unit 220 and the light reflecting unit 210 are both arranged in the accommodating cavity 420, and the light receiving unit 220 is fixed to the outer side of the light reflecting unit 210 by optical glue; Figure 4 It is shown that a light receiving unit 220 and a light reflecting unit 210 are located on the same side of the inner wall of the lens barrel 410, and the light receiving unit 220 is arranged in the accommodating cavity 420. The light receiving unit 220 can be arranged on the outer wall 403 of the lens barrel 410 to save the internal space of the lens barrel 410. By providing a light-transmitting hole 401 for the second light to pass through on the lens barrel 410, light reception can be achieved.

[0056] In other embodiments, Figure 5 As shown in , the light reflecting unit 210 (first reflecting interface or second reflecting interface) is arranged circumferentially along the inner wall 402 of the shell 400, and the orthographic projection of the light reflecting unit 210 on the display panel module 100 coincides with the orthographic projection of the inner wall 402 on the display panel module 100.

[0057] In the present application, the first reflection interface 211 is arranged on the inner wall 402 of the housing 400 and is inclined along the height of the inner wall 402. The diameter of the positive projection of the light reflection unit 210 on the display panel module 100 is equal to the diameter of the inner wall 402. In this embodiment, the area of ​​the first reflection interface 211 is increased to improve the utilization rate of the light reflected by the human eye 300 and improve the accuracy of eye tracking. Among them, the first reflection interface 211 includes a first substrate and a multilayer dielectric film arranged on the first substrate, and the second reflection interface 214 includes a second substrate and a dichroic optical coating arranged on the second substrate. By providing a groove arranged along the circumferential direction on the inner wall 402 of the housing 400, the first substrate (second substrate) can be fixed in the groove of the inner wall 402 to achieve circumferential fixation of the housing 400.

[0058] It should be noted that if Figure 6 As shown, when infrared is used as the second light, the light emitting unit 240 can be set on the side of the light reflecting unit 210 close to the human eye 300 to prevent the infrared light emitted by the light emitting unit 240 from directly passing through the second reflective film 214 and entering the light receiving unit 220 to affect eye tracking.

[0059] It is also understandable that a person skilled in the art can add other optical elements or combinations of optical elements for adjusting the light path as needed, so as to adjust the light path according to the position of the light reflection unit 210, so that more light reflected by the human eye 300 can pass through the first reflection interface 211 and enter the light collection unit, so as to improve the accuracy of eye tracking.

[0060] In an embodiment of the present invention, the eye tracking optical system further includes: a lens module 500 disposed between the eye tracking module 200 and the human eye 300, and the lens module 500 includes at least one lens. The lens can converge the first light emitted by the display panel module 100 or the second light emitted by the light emitting unit 240, and at the same time penetrate the second light reflected by the human eye 300, which can effectively meet the normal display requirements and achieve the eye tracking effect.

[0061] When the eye tracking optical system of the present invention is used in a specific application, after receiving the second light reflected by the human eye 300 through the light receiving unit 220, the second light is converted into an electrical signal and an image of the human eye 300 is generated based on the electrical signal. The processing unit completes the tracking of the user's human eye 300 according to the image of the human eye 300 obtained by the light receiving unit 220, wherein the processing unit can obtain the image of the user's human eye 300, and obtain information such as the gaze position, movement, and blinking state of the human eye 300 based on the image of the human eye 300, thereby realizing eye tracking. When applied to display devices such as AR / VR, it is used to track the gaze point or focus of the user's eye relative to the display panel module 100 (such as a touch sensing screen) of the device in real time. A cursor or focus indicator can be generated on the display panel module 100 based on the gaze point or focus of the tracked user's eye. The generated cursor or focus indicator can be used to select, activate, or interact with software applications, files, graphical user interfaces (GUIs), or icons or objects on the GUI to produce desired actions, operations, or effects.

[0062] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An eye tracking optical system, characterized in that: include: A display panel module, used for emitting a first light beam toward human eyes; An eye tracking module arranged on the light emitting side of the display panel module includes a light reflecting unit and a light receiving unit, wherein the light receiving unit is used to receive a second light reflected by a human eye and couple the second light to the light receiving unit, and the light receiving unit is used to receive an incident second light to realize eye tracking, wherein the first light and the second light are different lights.

2. The eye tracking optical system according to claim 1, wherein: The first light is a first polarized light, the second light is a second polarized light, and the polarization directions of the first polarized light and the second polarized light are perpendicular; The light reflection unit includes a first reflection interface, the first reflection interface includes a multilayer dielectric film, and the first reflection interface is used to reflect the second polarized light and transmit the first polarized light.

3. The eye tracking optical system according to claim 2, wherein: The display panel module includes a display panel and a polarizer disposed on the display panel near the light-emitting side, wherein the polarizer is used to convert the light of the display panel into first polarized light and emit the first polarized light.

4. The eye tracking optical system according to claim 3, characterized in that: The first reflective interface is tilted relative to the display panel, and the first reflective interface also includes a first prism and a second prism for fixing the first reflective interface, the first prism and the second prism are right-angled triangular prisms, the oblique surface of the first prism and the oblique surface of the second prism are oppositely arranged, and the first reflective interface is fixed on the oblique surface of the first prism or the second prism.

5. The eye tracking optical system according to claim 1, wherein: Also includes: a light emitting unit, the light emitting unit being used to emit the second light to a human eye, the second light being infrared light; The light emitting unit is arranged inside the display panel module or on the light emitting side of the display panel module.

6. The eye tracking optical system according to claim 5, characterized in that: The light reflecting unit comprises a second reflecting interface, the second reflecting interface comprises a dichroic optical coating, and the second reflecting interface is used for reflecting infrared light and transmitting visible light.

7. The eye tracking optical system according to claim 6, characterized in that: The second reflective interface is arranged at an angle relative to the display panel, and the light reflecting unit also includes a third prism and a fourth prism for fixing the second reflective interface, the third prism and the fourth prism are right-angled triangular prisms, the inclined surface of the third prism and the inclined surface of the fourth prism are arranged opposite to each other, and the second reflective interface is fixed on the inclined surfaces of the third prism and the fourth prism.

8. The eye tracking optical system according to claim 1, wherein: Also includes: The shell comprises a lens barrel and a first end and a second end oppositely arranged on the lens barrel, wherein the first end is an end close to a human eye, the display panel module is fixedly arranged on the second end, and the light receiving unit and the light reflecting unit are both fixedly arranged on the lens barrel.

9. The eye tracking optical system according to claim 8, characterized in that: The lens barrel is provided with a receiving cavity for receiving the light reflecting unit, the receiving cavity protrudes from the inner wall to the outer wall of the lens barrel, and the viewing angle between the human eye and the display panel module is less than or equal to the viewing angle between the human eye and the light reflecting unit.

10. The eye tracking optical system according to claim 9, characterized in that: The light reflecting unit and the light receiving unit are located on the same side of the lens barrel, and the light receiving unit is fixedly arranged on the outer side of the light reflecting unit by optical adhesive.

11. The eye tracking optical system according to claim 8, wherein: The light reflecting unit and the light receiving unit are located at two opposite sides of the lens barrel in the radial direction. The light receiving unit is fixedly arranged on the outer wall of the lens barrel, and a light-transmitting hole for the second light to pass through is arranged on the lens barrel.

12. The eye tracking optical system according to claim 8, wherein: The light reflecting unit is arranged along the circumference of the inner wall of the housing, and the orthographic projection of the light reflecting unit on the display panel module coincides with the orthographic projection of the inner wall on the display panel module.

13. The eye tracking optical system according to claim 1, wherein: Also includes: A lens module is arranged between the eye tracking module and the human eye, and the lens module includes at least one lens.

14. A display device, characterized in that: The invention comprises at least one eye-tracking optical system as claimed in any one of claims 1 to 13.

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