Smart glasses and method for controlling a vehicle function

Abstract

This document describes a pair of digital key glasses (210) comprising a digital key (111) that authenticates the digital key glasses (210) for controlling a function (103) of a vehicle (100), and a communication unit (202) configured to establish a communication connection (112) with the vehicle (100) for controlling the function (103). Furthermore, the digital key glasses (210) comprise a control unit (201) configured to initiate authentication of the digital key glasses (210) on the vehicle (100) using the digital key (111) and, following authentication, to initiate control of the vehicle function (103) depending on the digital key glasses (210).

Description

[0001] This document deals with the control of one or more functions of a vehicle using a digital key device.

[0002] A vehicle may be equipped with a communications unit that allows the user to control one or more functions of the vehicle via a portable device, such as a smartphone. Examples of functions that can be controlled using the portable device include unlocking and / or locking a vehicle door and / or starting the vehicle engine. The portable device typically contains a digital key (in particular, a CCC (Car Connectivity Consortium) digital key) for authenticating the portal device on the vehicle. A portable device containing a digital key may be referred to as a digital key device.

[0003] This document addresses the technical problem of increasing the convenience of controlling one or more vehicle functions with a digital key device. This technical problem is solved by each of the independent claims. Preferred examples are specified in the dependent claims.

[0004] According to one aspect, digital key glasses are described, wherein the digital key glasses may be augmented reality (AR) glasses. The digital key glasses may be worn by a user so that the user can look through the (corrective or non-corrective) lenses of the digital key glasses. The digital key glasses comprise a digital key (in particular a digital CCC key, possibly version 3) that authenticates the digital key glasses for controlling a function of a vehicle (e.g., a car, a truck, and / or a bus). The digital key may be stored in a memory unit, in particular in a security element, of the digital key glasses.Examples of vehicle functions are: an access function for accessing the vehicle, a function for controlling a vehicle engine, a function for controlling a vehicle window, a function for controlling a (comfort) component of the vehicle, etc.

[0005] In addition, the digital key glasses feature a communication unit configured to establish a communication connection with the vehicle to control the vehicle's operation. The communication connection between the digital key glasses and the vehicle may include a Bluetooth Low Energy (BLE) and / or an Ultra Wideband (UWB) communication connection.

[0006] The digital key glasses also include a control unit configured to authenticate the digital key glasses with the vehicle's digital key. For this purpose, a key derived from the digital key can be sent to the vehicle via the communication link. The vehicle can verify the digital key to allow or reject the authentication of the digital key glasses. The digital key glasses can be notified via the communication link that the vehicle has granted authentication.

[0007] Furthermore, the control unit is configured to initiate (subject to authentication) the control of the vehicle function depending on the digital key glasses. In particular, the control unit of the digital key glasses can participate in a UWB ranging process (via the communication link) that allows the vehicle to determine the location of the digital key glasses relative to the vehicle. The vehicle function can be controlled depending on the location of the digital key glasses. For example, a vehicle door can be unlocked if it is determined (as part of the UWB ranging process) that the digital key glasses are sufficiently close to the vehicle door.

[0008] This describes smart glasses that can be used to (remotely) control a vehicle function in a particularly convenient way.

[0009] The digital key glasses typically comprise one or more display elements (e.g., in one or more lenses of the digital key glasses) configured to display visual information in the field of view of the digital key glasses (and consequently in the field of view of the user wearing the digital key glasses). A display element may, for example, consist of a matrix of (transparent) LEDs (light-emitting diodes) that can be activated or deactivated to display visual information. A display element may be configured to display N x M pixels, e.g., with N, M greater than 50, or greater than 100, or greater than 500. The visual information that can be displayed by the one or more display elements may include one or more symbols, text, a graphic representation of a person, etc.

[0010] The control unit can be configured to display visual information about the vehicle, in particular about (the status of) the vehicle's function, in the field of view of the digital key glasses using one or more display elements. Thus, the digital key glasses can be used to provide the user with additional information about the vehicle and / or its function, thus further increasing the convenience of vehicle control.

[0011] The control unit can be configured to determine location data about the location of the vehicle relative to the digital key glasses, in particular, location data about the location of the vehicle within the field of view of the digital key glasses. The location data can be determined based on: • Sensor data from one or more sensors, in particular one or more motion sensors (such as accelerometers and / or inertial measurement units), of the digital key glasses; and / or • Image data captured by one or more cameras of the digital key glasses (in conjunction with a computer vision algorithm); and / or • Signals transmitted via the communication link between the digital key glasses and the vehicle, in particular signals relating to the UWB ranging process performed by the vehicle to locate the digital key glasses; for example, the vehicle may inform the digital key glasses of their location (relative to the vehicle) via the communication link.

[0012] The control unit can be configured to select and / or adjust and / or determine the visual information displayed by the one or more display elements depending on the location data. By incorporating location data regarding the vehicle's location in the field of view of the digital key glasses, the quality of the visual information can be improved, further increasing the convenience of the control system for controlling the vehicle's function.

[0013] The control unit can be configured to determine, based on the location data, a trajectory of the user wearing the digital key glasses toward the vehicle, in particular toward a door of the vehicle. For example, the current location of the digital key glasses (and the user) can be determined. In addition, the location of the vehicle can be determined. The control unit can be configured to determine a trajectory leading from the current location of the user to the location of the vehicle. Alternatively or additionally, the trajectory can also be determined by the vehicle (e.g., using UWB ranging data). The control unit can be configured to determine the trajectory by receiving trajectory data representative of the trajectory from the vehicle via the communication link.

[0014] Furthermore, the control unit can be configured to cause the one or more display elements to display visual information about the trajectory in the field of view of the digital key glasses. In particular, the trajectory can be displayed (e.g., in the form of a line or a red carpet leading to the vehicle). By providing information about the trajectory to the vehicle, the user's convenience can be further increased.

[0015] The control unit can be configured to determine a presentation position on or near the vehicle for displaying the visual information. In other words, it can specify where (i.e., at which presentation position) the visual information should be displayed. The presentation position can be on the vehicle body or adjacent to the body.

[0016] The control unit can be configured to determine the presentation position depending on the type and / or content of the visual information to be displayed. Alternatively or additionally, the control unit can be configured to determine a component (e.g., the door, trunk, dashboard, engine, etc.) of the vehicle to which the visual information is assigned. The presentation position can then be determined depending on the position of the component of the vehicle. The presentation position can, for example, correspond to the position of the component.

[0017] Furthermore, the control unit may be configured to cause the one or more display elements to display the visual information in the field of view of the digital key glasses based on the location data, such that the visual information is perceived by the user wearing the digital key glasses as being at the presentation position.

[0018] By specifying a specific presentation position for the display of visual information, the convenience of the control system can be further increased. In particular, the user can more easily associate the displayed visual information with a specific component of the vehicle.

[0019] In one example, the control unit may determine that the visual information relates to a door, in particular the driver's door, of the vehicle. The presentation position for displaying visual information about a vehicle door may be on the door or near the door. The visual information may then be displayed on the door or near the door. For example, the function of the vehicle may cause the vehicle door to open automatically when the wearer of the digital key glasses approaches the vehicle door. The visual information displayed next to the door may include a visual representation of a chauffeur opening the vehicle door.

[0020] The control unit can be configured to determine the distance between the digital key glasses and the vehicle based on the location data (in particular based on the signals and / or the data derived from the UWB distance measurement method). The visual information, in particular the content and / or a visual feature (such as the color and / or intensity) of the visual information, can be adapted depending on the distance between the digital key glasses and the vehicle. Alternatively or additionally, the visual information can be displayed or not displayed in the field of view of the digital key glasses depending on the distance between the digital key glasses and the vehicle. By taking the distance between the digital key glasses and the vehicle into account when displaying the visual information, the convenience of the control system can be further increased.

[0021] The control unit can be configured to detect that the wearer of the digital key glasses is moving away from the vehicle. This can be determined based on the UWB distance measurement method. In response to the detection of the user moving away from the vehicle, visual information about the vehicle, particularly about the vehicle's functional status, can be displayed in the field of view of the digital key glasses. For example, the user can be informed that the vehicle is locked, further increasing the convenience of the control system.

[0022] The digital key glasses can include one or more microphones configured to capture microphone data indicative of a voice command spoken by the user of the digital key glasses. The control unit of the digital key glasses can be configured to determine a control command for controlling a vehicle function (in particular, an RKE (Remote Keyless Entry) command) based on the microphone data. A natural language processing (NLP) algorithm can be used for this purpose. The control command can be sent to the vehicle via the communication connection, enabling particularly convenient control of a vehicle function (via voice control).

[0023] According to another aspect, a system for controlling a function of a vehicle is described, the system comprising the vehicle and the digital key glasses described in the present document.

[0024] According to a further aspect, a method for controlling a function (e.g., an access function) of a vehicle (e.g., a car, a truck, and / or a bus) using digital key glasses (e.g., using augmented reality (AR) glasses) is described. The digital key glasses contain a digital key (in particular, a digital CCC key 3) that authenticates the digital key glasses for controlling the function of the vehicle. Furthermore, the digital key glasses comprise a communication unit configured to establish a communication connection (BLE and / or UWB) with the vehicle to control the function of the vehicle.

[0025] The method comprises initiating the authentication of the digital key frame on the vehicle using the digital key. Furthermore, the method (e.g., after authentication) comprises controlling the vehicle function depending on the digital key frame, in particular depending on the position of the digital key frame relative to the vehicle.

[0026] According to another aspect, a software program is described. The software program can be adapted to execute on a processor and to perform the method steps described in this document when executed on the processor.

[0027] According to another aspect, a storage medium is described. The storage medium may contain a software program suitable for execution on a processor and performing the method steps described in this document when executed on the processor.

[0028] According to a further aspect, a computer program product is described. The computer program may contain executable instructions for performing the method steps described in this document when executed on a computer, a processor, or a programmable hardware component.

[0029] It should be noted that the methods and systems, including their preferred embodiments, as described in the present patent application may be used alone or in combination with the other methods and systems disclosed in this document. Furthermore, all aspects of the methods and systems presented in the present patent application may be combined in any desired manner. In particular, the features of the claims may be combined in any desired manner. Furthermore, it should be noted that parentheses are used in this document to indicate optional features.

[0030] The invention will now be explained by way of example with reference to the accompanying drawings, in which Fig. 1a shows an example of a system for controlling a vehicle function with a digital key device; Fig. Figure 1b shows an example of a situation where a digital key device is located near a vehicle; Fig. 2 shows an example of a digital key fob for controlling a vehicle function of a vehicle and / or for displaying visual information about the vehicle; Fig. 3 illustrates a scenario of a user with digital key glasses approaching a vehicle; and Fig. 4 shows a flowchart of an example of a method for providing a vehicle-related function using digital key glasses.

[0031] As described above, this document addresses the technical problem of increasing the comfort of an access and / or control system for vehicles. In this context, Fig. 1a shows an example system 150 comprising a vehicle 100 and at least one digital key device 110. The digital key device 110 is typically a portable electronic device, such as a smartphone or a tablet PC, with a digital key 111 stored on the portable electronic device, in particular in a protected memory area and / or on a security element of the portable electronic device.

[0032] The digital key device 110 can communicate with a communication unit 102 of the vehicle 102 via one or more different wireless communication links 112. Different communication links 112 can be used for different purposes. In particular, a Bluetooth Low Energy (BLE) communication link 112 can be used for the following: • Determining the distance and / or the relative position between the digital key device 110 and the vehicle 100 (in particular based on the signal strength, in particular the RSSI (Received Signal Strength Indicator), of the radio signals exchanged between the vehicle 100 and the device 110, and / or based on a channel sounding technique); and / or • Exchanging data between the digital key device 110 (e.g., a control command to control a vehicle function, such as unlocking a door and / or opening or closing a window and / or activating or deactivating a heating function).

[0033] Alternatively or additionally, an ultra-wideband (UWB) communication link 112 may be used to relatively accurately determine the location of the device 110 relative to the vehicle 100. Determining the location of the device 110 via the UWB communication link 112 may be referred to as UWB ranging.

[0034] A control unit 101 of the vehicle 100 may be configured to control at least one vehicle function 103 of the vehicle 100 depending on the communication between the device 110 and the vehicle 100, as shown in Fig. 1b. In this context, the digital key 111 of the device 110 can be verified, in particular authenticated. Furthermore, depending on the authentication, one or more vehicle functions 103 can be controlled, in particular depending on: • the distance between the device 110 and the vehicle 100; • the location of the device 110 relative to the vehicle 100; and / or • a control command sent from the device 110 to the vehicle 100 via a communication link 112.

[0035] In an example system 150, a BLE communication connection 112 may be established between the device 110 and the vehicle 100 once the distance between the device 110 and the vehicle 100 is equal to or less than a first distance threshold 121. This allows a user to remotely control one or more vehicle functions 103 with the device 110. Typically, the vehicle 100 repeatedly announces the availability of a BLE communication connection 112, e.g., at a certain announcement frequency. At the first distance threshold 121, the device 110 (which may also be referred to as a user equipment (UE)) receives the advertisement, whereupon the vehicle 100 and the device 110 establish the BLE communication connection 112. The first distance threshold 121 may therefore depend on the communication capabilities of the device 110, the environment of the vehicle 100 and the device 110, and / or the location of the device 110 relative to the vehicle 100.

[0036] Furthermore, a UWB communication link 112 may be established between the device 110 and the vehicle 100 once the distance between the device 110 and the vehicle 100 is equal to or less than a second distance threshold 122 (which may be less than the first distance threshold 121 and / or may depend on the communication capabilities of the device 110), allowing the location of the device 110 to be precisely determined. Depending on the establishment of the UWB communication link 112 and / or the determination of the location of the device 110, control of one or more further vehicle functions 103 (in addition to the one or more functions 103 that can be controlled via the BLE communication link 112) may be enabled.

[0037] Fig. 2 shows smart glasses 210 that can be worn by a user when they are in proximity to a vehicle 100. The smart glasses 210 can include a digital key 111, wherein the digital key 111 can be stored in a security element 205 of the glasses 210. In particular, the smart glasses 210 can be configured to be used as a digital key device 110 within a control system 150 for controlling one or more vehicle functions 103 of the vehicle 100. Smart glasses 210 configured for use as a digital key device 110 can be referred to as digital key glasses. Therefore, the features of a digital key device 110 described herein are also applicable to the digital key glasses 210.

[0038] The digital key glasses 210 comprise a communication unit 202 configured to establish a communication connection 112, in particular a BLE and / or UWB communication connection, with the communication unit 102 of the vehicle 100. Furthermore, the digital key glasses 210 may comprise one or more sensors 203, in particular one or more inertial measurement units, configured to provide sensor data indicating the orientation and / or movement of the digital key glasses 210. A control unit 201 of the digital key glasses 210 may be configured to determine the spatial orientation and / or pose of the digital key glasses 210 and thus the viewing direction of the user wearing the digital key glasses 210 based on the sensor data from the one or more sensors 203 of the digital key glasses 210.

[0039] The digital key glasses 210 also include one or more display elements 204 configured to display visual information within the user's field of view. The one or more display elements 204 may, for example, be implemented in the one or more lenses 206 of the glasses 210 and / or configured to display visual information on the one or more lenses 206 of the glasses 210 (e.g., with one or more projectors). A display element 204 may, for example, be configured to display a pixel matrix of N x M pixels, e.g., with N, M greater than 50, or greater than 100, or greater than 500.

[0040] The control unit 201 of the digital key glasses 210 can be configured to detect (based on the signals received via the communication unit 202) that the glasses 210 are in the vicinity of the vehicle 100. In response, one or more communication connections 112 can be established between the digital key glasses 210 and the vehicle 100. The digital key 111 of the glasses 210 can be made available to the vehicle 100 to authenticate the glasses 210 to the vehicle 100. Subject to the authentication of the glasses 210, the control of one or more vehicle functions 103 (in particular, an access function for accessing the vehicle 100) can be enabled using the digital key glasses 210.

[0041] In addition, one or more additional vehicle-related functions may be provided. In particular, visual information may be provided to the user via one or more display elements (e.g., projectors) 204 of the glasses 210, wherein the visual information may be related to the control of one or more vehicle functions 103.

[0042] Fig. 3 shows an example scenario in which a user 300 wearing digital key glasses 210 approaches the vehicle 100 controlled by the digital key glasses 210. The control unit 201 of the glasses 210 can be configured to determine a trajectory for the user 300 that begins at the current position of the user 300 and guides the user 300 to the vehicle 100, e.g., to the driver's door of the vehicle 100. The trajectory can be calculated by the control unit 201 of the glasses 210 (e.g., based on image data captured by a camera 207 of the glasses 210). Alternatively or additionally, the trajectory can be calculated by the vehicle 100 (e.g., based on UWB localization) and sent to the glasses 210. Therefore, the glasses 210 can determine the trajectory by receiving trajectory data from the vehicle 100 via the communication link 112.

[0043] The trajectory can be displayed as visual information 301 using one or more display elements 204 of the glasses 210, thereby providing additional support to the user 300 and increasing the comfort of the control system 150.

[0044] Alternatively or additionally, the control unit 201 of the digital key glasses 210 can be configured to determine information about the vehicle 100, in particular about the state of the vehicle 100. The information can be determined via the one or more communication connections 112 between the vehicle 100 and the digital key glasses 210. The information can be an indication of: • the status of one or more vehicle functions 103, e.g., door locked or unlocked; window closed or open; heater active or in operation; and / or • the charge level of a battery of the vehicle 100 and / or the fill level of a petrol tank of the vehicle 100.

[0045] The information can be displayed as visual information 302 by the glasses 210 in the field of view of the user 300. Since the position of the glasses 210 relative to the vehicle 100 is known (due to the UWB distance measurement and / or due to sensor data from one or more sensors 203 of the glasses 210), the visual information 302 can be displayed at a defined presentation position with respect to the vehicle 100, e.g., above the driver's cab of the vehicle 100 (as in Fig. 3). In particular, the visual information 302 can be displayed at a presentation position on the vehicle 100 that is connected to the visual information 302 itself. For example, the locking state of the driver's door can be displayed next to the driver's door and / or the locking state of the trunk can be displayed next to the trunk. In this way, the ease of use of the system 150 can be further increased.

[0046] The control unit 201 of the glasses 210 may be configured to repeatedly adjust the displayed visual information 301, 302 (depending on the updated position of the vehicle 100 and / or depending on the updated pose of the glasses 210), in particular such that the presentation position of the visual information 301, 302 is perceived by the user 300 as unchanged (even if the pose of the glasses 210 changes).

[0047] Therefore, AR (Augmented Reality) glasses 210 are described, which include hardware 205 serving as a CCC digital key 111. The glasses 210 are capable of locking or unlocking a vehicle 100. The UWB localization of the AR glasses 210 by the vehicle (which is sent to the AR glasses 210, for example, via the BLE communication link 112 and / or via the (narrowband) UWB communication link 112) can be combined with sensor data from the accelerometer and / or one or more other sensors 203 of the glasses 210 (which can, for example, display the trajectory of the user 300). Based on this information, the AR glasses 210 can determine the position of the vehicle 100 (relative to the user 300 and / or the glasses 210). In particular, the position of the vehicle 100 within the field of view of the glasses 210 can be determined.

[0048] Alternatively or additionally, the position of the vehicle 100 can be determined using computer vision. In particular, the glasses 210 can comprise a camera 207 configured to capture image data about the surroundings of the glasses 210, in particular the surroundings within the field of view of the glasses 210. The image data can be analyzed by the control unit 201 of the glasses 210 using one or more computer vision algorithms to detect the vehicle 100 and / or to determine the position of the vehicle 100 relative to the glasses 210 (in particular, the position of the vehicle 100 within the field of view of the glasses 210).

[0049] Knowing the location of the vehicle 100 relative to the glasses 210 makes it possible, for example, to display additional information 302 about the vehicle 100, to show an animation on the way to the vehicle 100 (e.g., staging, a greeting scenario, etc.), and / or to overlay information about the locking status, etc., into the field of view of the user 300.

[0050] Additional information 302, which may be displayed, for example, on the top of the vehicle 100, may include the battery level, the locking status, the interior temperature, the time to the destination (of a planned trip), the weather at the destination, a charging status, etc. The display location may be selected depending on the position and orientation of the glasses 210 and based on the known location of the vehicle 100. For this purpose, UWB localization, AR glasses sensors 103 such as an accelerometer, a camera 207, etc., may be used.

[0051] As an example of an animation on the way to the vehicle 100 (e.g., staging, greeting scenario, etc.), a red carpet can be displayed as visual information 301, with the carpet leading to the driver's door or to all doors of the vehicle 100. An animation can be intensified (e.g., in terms of colors) as the user 300 approaches the vehicle 100 (where the exact distance between the glasses 210 and the vehicle 100 can be known due to UWB localization). An animated chauffeur can be displayed opening the (automatic) door of the vehicle 100 (as the user 300 approaches the door of the vehicle 100). A band playing a song to welcome the user 300 can be displayed.

[0052] Information about the locking status, etc., may be overlaid in the field of view of the user 300. For example, the user 300 may be walking away from the vehicle 100 (facing away from the vehicle 100). The distance between the vehicle 100 and the user 300 may be known (from UWB localization). The glasses 210 may overlay information about the locking event, the time until full charge, a farewell message, etc., upon detecting that the user 300 has reached a certain distance from the vehicle 100.

[0053] Fig.4 shows a flowchart of a (computer-implemented) method 400 for controlling a function 103, in particular an access function, of a vehicle 100 using digital key glasses 210 (which can be worn by a user 300). The digital key glasses 210 can be augmented reality (AR) glasses. The digital key glasses 210 comprise a digital key 111 (e.g., within a security element 205) that authenticates the digital key glasses 210 for controlling the function 103 of the vehicle 100. Furthermore, the digital key glasses 210 comprise a communication unit 202 configured to establish a (BLE and / or UWB) communication connection 112 with the vehicle 100 for controlling the function 103 of the vehicle 100.

[0054] The method 400 includes the authentication 401 of the digital key glasses 210 on the vehicle 100 with the digital key 111. For this purpose, the digital key 111 or a key derived from the digital key 111 can be sent to the vehicle 100 via the communication connection 112.

[0055] Furthermore, the method 400, in particular subject to authentication, comprises causing 402 the vehicle function 103 to be controlled as a function of the digital key glasses 210, in particular as a function of the location of the digital key glasses 210 relative to the vehicle 100 (wherein the location of the digital key glasses 210 can be determined, for example, by means of UWB distance measurement).

[0056] This document describes a digital key glasses 210 and an associated method 400 that increase the convenience of a system 150 for controlling one or more functions 103 of a vehicle 100.

[0057] It should be understood that the description and drawings merely illustrate the principles of the proposed methods and systems. Those skilled in the art will be able to implement various arrangements that, although not expressly described or shown herein, embody the principles of the invention and are within its spirit and scope. Furthermore, all examples and embodiments described herein are expressly intended for explanatory purposes only to assist the reader in understanding the principles of the proposed methods and systems. Furthermore, all explanations contained herein describing principles, aspects, and embodiments of the invention, as well as specific examples thereof, are intended to include equivalents thereof.

Claims

[1] Digital key glasses (210), which include: - a digital key (111) which authenticates the digital key glasses (210) for controlling a function (103) of a vehicle (100), - a communication unit (202) configured to establish a communication connection (112) with the vehicle (100) for controlling the function (103); and - a control unit (201) configured to: - arranging for the digital key glasses (210) on the vehicle (100) to be authenticated with the digital key (111); and - subject to authentication, initiating the control of the vehicle function (103) depending on the digital key glasses (210). [2] Digital key glasses (210) according to claim 1, wherein - the digital key glasses (210) further comprises one or more display elements (204) configured to display visual information (301, 302) within a field of view of the digital key glasses (210); and - the control unit (201) is configured to cause visual information (301, 302) relating to the vehicle (100), in particular relating to the function (103) of the vehicle (100), to be displayed within the field of view of the digital key glasses (210) using the one or more display elements (204). [3] Digital key glasses (210) according to claim 2, wherein the control unit (201) is configured to: - Determining location data relating to a location of the vehicle (100) relative to the digital key glasses (210), in particular relating to the location of the vehicle within the field of view of the digital key glasses (210); and - selecting and / or adapting and / or determining the visual information (301, 302) displayed by the one or more display elements (204) depending on the location data. [4] Digital key glasses (210) according to claim 3, wherein the control unit (201) is configured to determine the location data based on: - sensor data from one or more sensors (203), in particular one or more motion sensors, of the digital key glasses (210); and / or - image data captured by one or more cameras (207) of the digital key glasses (210); and / or - signals transmitted via the communication link (112) between the digital key glasses (210) and the vehicle (100), in particular signals relating to the ultra-wideband (UWB) positioning carried out by the vehicle (100) for locating the digital key glasses (210). [5] Digital key glasses (210) according to one of claims 3 to 4, wherein the control unit (201) is configured for the following: - determining a trajectory of a user (300) wearing the digital key glasses (210) in the direction of the vehicle (100), in particular in the direction of a door of the vehicle (100), based on the location data; and - causing the one or more display elements (204) to display visual information (301) about the trajectory in the field of view of the digital key glasses (210). [6] Digital key glasses (210) according to one of claims 3 to 5, wherein the control unit (201) is configured for the following: - determining a presentation position on or near the vehicle (100) for displaying the visual information (302); and - Causing the one or more display elements (204) to display the visual information (302) within the field of view of the digital key glasses (210) based on the location data, such that the visual information (302) is perceived by a user (300) wearing the digital key glasses (210) at the presentation position. [7] Digital key glasses (210) according to claim 6, wherein the control unit (201) is designed to determine the presentation position depending on a type and / or content of the visual information (302) to be displayed. [8] Digital key glasses (210) according to one of claims 6 to 7, wherein the control unit (201) is configured for the following: - determining a component of the vehicle (100) to which the visual information (302) is assigned; and - Determining the presentation position depending on a position of the component of the vehicle (100). [9] Digital key glasses (210) according to one of claims 3 to 8, wherein the control unit (201) is configured for the following: - determining a distance between the digital key glasses (210) and the vehicle (100) based on the location data; and - adapting the visual information (301, 302), in particular a content and / or a visual property of the visual information (301, 302), depending on the distance between the digital key glasses (210) and the vehicle (100); and / or - Initiating or preventing the display of the visual information (302) in the field of view of the digital key glasses (210) depending on the distance between the digital key glasses (210) and the vehicle (100). [10] Digital key glasses (210) according to one of claims 3 to 9, wherein the control unit (201) is configured to: - Detecting that a user (300) wearing the digital key glasses (210) is moving away from the vehicle (100); and - in response to the detection that the user (300) is moving away from the vehicle (100), causing visual information (302) relating to the vehicle (100), in particular relating to a status of the function (103) of the vehicle (100), to be displayed in the field of view of the digital key glasses (210). [11] A method (400) for controlling a function (103) of a vehicle (100) using digital key glasses (210); wherein the digital key glasses (210) comprise a digital key (111) that authenticates the digital key glasses (210) for controlling the function (103) of the vehicle (100), and a communication unit (202) configured to establish a communication connection (112) with the vehicle (100) for controlling the function (103) of the vehicle (100); wherein the method (400) comprises: - initiating (401) the authentication of the digital key glasses (210) on the vehicle (100) using the digital key (111); and - depending on the authentication, initiating the control (402) of the vehicle function (103) depending on the digital key glasses (210), in particular depending on a location of the digital key glasses (210) relative to the vehicle (100). [12] Computer program with a program code for carrying out the method (400) according to claim 11, when the computer program is executed on a computer, a processor or a programmable hardware component.

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