KR20250064572A - Light guide device and electronic device including the same - Google Patents

Abstract

The embodiment discloses a light guide device including a first substrate; and a first input diffractive element, a first transmission diffractive element, and a first output diffractive element arranged on the first substrate and onto which light emitted from a projector is sequentially incident; and satisfying mathematical expressions 1 and 2.
[Mathematical Formula 1]

[Mathematical formula 2]

(Here, θ _projector is the angle between the projector and the first substrate, is the angle at which the projector faces the first substrate, γ is the wrap angle of the first substrate, λ is the wavelength of light, α is the pantoscopic angle of the first substrate, Λ _IC is the grating period of the first input diffractive element, Λ _OC is the grating period of the first output diffractive element, Λ _FG is the grating period of the first transmission diffractive element, is the grating angle of the first input diffractive element, is the grating angle of the first diffractive element, is the grating angle of the first transmission diffraction element, FoV is the field of view of the light guide device, x and y are the resolutions of the light guide device.)

Description

{LIGHT GUIDE DEVICE AND ELECTRONIC DEVICE INCLUDING THE SAME}

The embodiment relates to a light guide device and an electronic device including the same.

Virtual Reality (VR) refers to a specific environment or situation, or the technology itself, that is similar to reality but not real, created using artificial technology such as computers.

Augmented Reality (AR) is a technology that synthesizes virtual objects or information into the real environment to make them appear as if they existed in the original environment.

Mixed reality (MR) or hybrid reality refers to the creation of a new environment or new information by combining the virtual world and the real world. In particular, it is called mixed reality when it refers to real-time interaction between things that exist in reality and virtual worlds.

At this time, the created virtual environment or situation stimulates the user's five senses and allows them to freely move between reality and imagination by experiencing spatial and temporal experiences similar to reality. In addition, the user can interact with the things implemented in this environment by not only simply immersing himself in this environment, but also using real devices to operate or give commands.

Recently, research on the equipment (gear, device) used in these technical fields has been actively conducted. However, the need for miniaturization and improvement of optical performance of these equipment is emerging.

The embodiment provides a projector device and an electronic device capable of designing a grid structure having degrees of freedom for all angles of an optical device and an observer, when using a projector device used for AR (Augmented Reality) and an electronic device including the same.

The embodiments provide a project device and an electronic device with improved optical performance.

The problem to be solved in the embodiment is not limited to this, and it can be said that the purpose or effect that can be understood from the solution or embodiment of the problem described below is also included.

An optical guide device according to an embodiment includes a first substrate; and a first input diffraction element, a first transmission diffraction element, and a first output diffraction element, which are arranged on the first substrate and onto which light emitted from a projector is sequentially incident; and can satisfy mathematical expressions 1 and 2.

[Mathematical formula 1]

[Mathematical formula 2]

(Here, θ _projector is the angle between the projector and the first substrate, is the angle at which the projector faces the first substrate, γ is the wrap angle of the first substrate, λ is the wavelength of light, α is the pantoscopic angle of the first substrate, Λ _IC is the grating period of the first input diffractive element, Λ _OC is the grating period of the first output diffractive element, Λ _FG is the grating period of the first transmission diffractive element, is the grating angle of the first input diffractive element, is the grating angle of the first diffractive element, is the grating angle of the first transmission diffraction element, FoV is the field of view of the light guide device, x and y are the resolutions of the light guide device.)

The wrap angle of the first substrate is an angle formed by the first substrate with respect to a first direction, and the first direction may be a direction perpendicular to a direction in which a user views the light guide device.

The pantospheric angle of the first substrate is an angle formed by the first substrate with respect to a second direction, and the second direction may be a direction perpendicular to the first direction and a direction in which the user views the light guide device.

The angle between the projector and the first substrate may be the angle formed between the direction in which the projector outputs the light and a plane perpendicular to the first substrate.

The angle at which the projector faces the first substrate is the angle that the direction in which the projector outputs the light makes with the first axis on the first substrate, and the first axis may be the long axis of the first substrate.

The first input diffractive element may include a first protrusion, the first transmission diffractive element may include a second protrusion, the first output diffractive element may include a third protrusion, and a grating period of the first input diffractive element may be a shortest distance between same side surfaces of adjacent first protrusions, a grating period of the first transmission diffractive element may be a shortest distance between same side surfaces of adjacent second protrusions, and a grating period of the first output diffractive element may be a shortest distance between same side surfaces of adjacent third protrusions.

The grating angle of the first input diffractive element may be an angle formed by the separation direction between the first protrusions of the first input diffractive element and the first axis, the grating angle of the first transmission diffractive element may be an angle formed by the separation direction between the second protrusions of the first transmission diffractive element and the first axis, and the grating angle of the first output diffractive element may be an angle formed by the separation direction between the third protrusions of the first output diffractive element and the first axis.

The apparatus may further include a second substrate arranged to overlap the first substrate; a second input diffractive element, a second transmission diffractive element, and a second output diffractive element arranged on the second substrate, onto which light is sequentially incident.

The grating angles of the first input diffractive element and the second input diffractive element may be the same, the grating angles of the first transmission diffractive element and the second transmission diffractive element may be the same, and the grating angles of the first output diffractive element and the second output diffractive element may be the same.

The viewing angle of the above light guide device may be the angle at which the light is incident on the first input diffractive element and transmitted to the first transmission diffractive element.

The grating periods of the second input diffractive element, the second transmission diffractive element, and the second output diffractive element may be different from the grating periods of the first input diffractive element, the first transmission diffractive element, and the first output diffractive element, respectively.

The light guide device according to the embodiment can satisfy mathematical expressions 3 and 4.

[Mathematical Formula 3]

[Mathematical formula 4]

(Here, θ _projector is the angle between the projector and the second substrate, is the angle at which the projector faces the second substrate, γ is the wrap angle of the second substrate, λ is the wavelength of light, α is the pantoscopic angle of the second substrate, Λ _IC is the grating period of the second input diffractive element, Λ _OC is the grating period of the second output diffractive element, Λ _FG is the grating period of the second transmission diffractive element, is the grating angle of the second input diffractive element, is the grating angle of the second diffraction element, is the grating angle of the second transmission diffraction element, FoV is the field of view of the light guide device, x and y are the resolutions of the light guide device.)

The wrap angle of the first substrate and the wrap angle of the second substrate may be the same.

The pantospheric angle of the first substrate and the pantospheric angle of the second substrate may be the same.

Light sequentially incident on the first input diffraction element, the first transmission diffraction element, and the first output diffraction element may have a different wavelength from light sequentially incident on the second input diffraction element, the second transmission diffraction element, and the second output diffraction element.

It is possible to provide a project device and electronic device capable of designing a grating structure having degrees of freedom for all angles of the optical device and the observer.

It is possible to provide a project device and electronic device with improved optical performance.

The various advantageous and beneficial advantages and effects of the present invention are not limited to the above-described contents, and will be more easily understood in the course of explaining specific embodiments of the present invention.

Figure 1 is a conceptual diagram illustrating an embodiment of an AI device.
FIG. 2 is a block diagram showing the configuration of an extended reality electronic device according to an embodiment of the present invention.
FIG. 3 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.
Figure 4 is a schematic diagram of a light guide device according to an embodiment of the present invention.
FIG. 5 is a drawing showing the angle of the substrate of the light guide device according to an embodiment of the present invention.
FIG. 6 is a drawing showing the angle between the projector and the substrate of the light guide device according to an embodiment of the present invention.
FIG. 7 is a drawing showing a grating pattern of a diffraction element of a light guide device according to an embodiment of the present invention.
Figure 8 is a schematic diagram of a light guide device according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

However, the technical idea of the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more of the components among the embodiments can be selectively combined or substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, can be interpreted in consideration of the contextual meaning of the relevant technology.

Additionally, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as "A and (or at least one) of B, C", it may include one or more of all combinations that can be combined with A, B, C.

Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

These terms are only intended to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

In addition, when described as being formed or arranged "above or below" each component, above or below includes not only the case where the two components are in direct contact with each other, but also the case where one or more other components are formed or arranged between the two components. In addition, when expressed as "above or below", it can include the meaning of the downward direction as well as the upward direction based on one component.

Figure 1 is a conceptual diagram illustrating an embodiment of an AI device.

Referring to FIG. 1, an AI system is connected to a cloud network (10) by at least one of an AI server (16), a robot (11), an autonomous vehicle (12), an XR device (13), a smartphone (14), or an appliance (15). Here, a robot (11), an autonomous vehicle (12), an XR device (13), a smartphone (14), or an appliance (15) to which AI technology is applied may be referred to as an AI device (11 to 15).

A cloud network (10) may mean a network that constitutes part of a cloud computing infrastructure or exists within a cloud computing infrastructure. Here, the cloud network (10) may be configured using a 3G network, a 4G or LTE (Long Term Evolution) network, a 5G network, etc.

That is, each device (11 to 16) constituting the AI system can be connected to each other through the cloud network (10). In particular, each device (11 to 16) can communicate with each other through a base station, but can also communicate with each other directly without going through a base station.

The AI server (16) may include a server that performs AI processing and a server that performs operations on big data.

The AI server (16) is connected to at least one of AI devices constituting the AI system, such as a robot (11), an autonomous vehicle (12), an XR device (13), a smartphone (14), or a home appliance (15), through a cloud network (10), and can assist at least part of the AI processing of the connected AI devices (11 to 15).

At this time, the AI server (16) can train an artificial neural network according to a machine learning algorithm on behalf of the AI devices (11 to 15), and can directly store the learning model or transmit it to the AI devices (11 to 15).

At this time, the AI server (16) can receive input data from the AI devices (11 to 15), infer a result value for the received input data using a learning model, and generate a response or control command based on the inferred result value and transmit it to the AI devices (11 to 15).

Alternatively, the AI device (11 to 15) may infer a result value for input data using a direct learning model and generate a response or control command based on the inferred result value.

<AI+Robot>

Robots (11) can be implemented as guide robots, transport robots, cleaning robots, wearable robots, entertainment robots, pet robots, unmanned flying robots, etc. by applying AI technology.

The robot (11) may include a robot control module for controlling movement, and the robot control module may mean a software module or a chip that implements the same as hardware.

The robot (11) can obtain status information of the robot (11), detect (recognize) the surrounding environment and objects, generate map data, determine a movement path and driving plan, determine a response to user interaction, or determine an action using sensor information obtained from various types of sensors.

Here, the robot (11) can use sensor information acquired from at least one sensor among lidar, radar, and camera to determine a movement path and driving plan.

The robot (11) can perform the above-described operations using a learning model composed of at least one artificial neural network. For example, the robot (11) can recognize the surrounding environment and objects using the learning model, and determine operations using the recognized surrounding environment information or object information. Here, the learning model can be learned directly in the robot (11) or learned from an external device such as an AI server (16).

At this time, the robot (11) may perform an action by generating a result using a direct learning model, but may also transmit sensor information to an external device such as an AI server (16) and perform an action by receiving the result generated accordingly.

The robot (11) can determine a movement path and driving plan using at least one of map data, object information detected from sensor information, or object information acquired from an external device, and control a driving unit to drive the robot (11) according to the determined movement path and driving plan.

The map data may include object identification information for various objects placed in the space where the robot (11) moves. For example, the map data may include object identification information for fixed objects such as walls and doors, and movable objects such as flower pots and desks. In addition, the object identification information may include name, type, distance, location, etc.

In addition, the robot (11) can perform an action or drive by controlling the driving unit based on the user's control/interaction. At this time, the robot (11) can obtain the intention information of the interaction according to the user's action or voice utterance, and determine a response based on the obtained intention information to perform the action.

<AI+Autonomous Driving>

Autonomous vehicles (12) can be implemented as mobile robots, vehicles, unmanned aerial vehicles, etc. by applying AI technology.

The autonomous vehicle (12) may include an autonomous driving control module for controlling autonomous driving functions, and the autonomous driving control module may mean a software module or a chip that implements the same as hardware. The autonomous driving control module may be included internally as a component of the autonomous vehicle (12), but may also be configured as separate hardware and connected to the outside of the autonomous vehicle (12).

An autonomous vehicle (12) can obtain status information of the autonomous vehicle (12), detect (recognize) the surrounding environment and objects, generate map data, determine a movement path and driving plan, or determine an operation by using sensor information obtained from various types of sensors.

Here, the autonomous vehicle (12) can use sensor information acquired from at least one sensor among lidar, radar, and camera, similar to the robot (11), to determine the movement path and driving plan.

In particular, an autonomous vehicle (12) can recognize an environment or objects in an area where the field of vision is obscured or an area beyond a certain distance by receiving sensor information from external devices, or can receive information recognized directly from external devices.

The autonomous vehicle (12) can perform the above-described operations using a learning model composed of at least one artificial neural network. For example, the autonomous vehicle (12) can recognize the surrounding environment and objects using the learning model, and determine the driving route using the recognized surrounding environment information or object information. Here, the learning model can be learned directly in the autonomous vehicle (12) or learned from an external device such as an AI server (16).

At this time, the autonomous vehicle (12) may perform an operation by generating a result using a direct learning model, but may also perform an operation by transmitting sensor information to an external device such as an AI server (16) and receiving the result generated accordingly.

An autonomous vehicle (12) can determine a movement path and driving plan by using at least one of map data, object information detected from sensor information, or object information acquired from an external device, and control a driving unit to drive the autonomous vehicle (12) according to the determined movement path and driving plan.

Map data may include object identification information for various objects placed in a space (e.g., a road) where an autonomous vehicle (12) runs. For example, map data may include object identification information for fixed objects such as streetlights, rocks, and buildings, and movable objects such as vehicles and pedestrians. In addition, object identification information may include name, type, distance, location, and the like.

In addition, the autonomous vehicle (12) can perform an action or drive by controlling the driving unit based on the user's control/interaction. At this time, the autonomous vehicle (12) can obtain the intention information of the interaction according to the user's action or voice utterance, and determine a response based on the obtained intention information to perform the action.

<AI+XR>

The XR device (13) can be implemented as an HMD (Head-Mount Display), a HUD (Head-Up Display) equipped in a vehicle, a television, a mobile phone, a smart phone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a fixed robot or a mobile robot, etc. by applying AI technology.

The XR device (13) can obtain information about surrounding space or real objects by analyzing 3D point cloud data or image data acquired through various sensors or from an external device to generate location data and attribute data for 3D points, and can render and output an XR object to be output. For example, the XR device (13) can output an XR object including additional information about a recognized object by corresponding it to the recognized object.

The XR device (13) can perform the above-described operations using a learning model composed of at least one artificial neural network. For example, the XR device (13) can recognize a real object from 3D point cloud data or image data using the learning model, and provide information corresponding to the recognized real object. Here, the learning model can be learned directly in the XR device (13) or learned in an external device such as an AI server (16).

At this time, the XR device (13) may perform an operation by generating a result using a direct learning model, but may also transmit sensor information to an external device such as an AI server (16) and perform an operation by receiving the result generated accordingly.

<AI+Robot+Autonomous Driving>

Robots (11) can be implemented as guide robots, transport robots, cleaning robots, wearable robots, entertainment robots, pet robots, unmanned flying robots, etc. by applying AI technology and autonomous driving technology.

A robot (11) to which AI technology and autonomous driving technology are applied may refer to a robot itself with autonomous driving functions, or a robot (11) that interacts with an autonomous vehicle (12).

A robot (11) with autonomous driving function can be a general term for devices that move on their own along a given path without user control or move by determining the path on their own.

A robot (11) with autonomous driving function and an autonomous vehicle (12) may use a common sensing method to determine one or more of a movement path or a driving plan. For example, a robot (11) with autonomous driving function and an autonomous vehicle (12) may use information sensed through a lidar, a radar, and a camera to determine one or more of a movement path or a driving plan.

A robot (11) interacting with an autonomous vehicle (12) may exist separately from the autonomous vehicle (12), and may be linked to autonomous driving functions inside or outside the autonomous vehicle (12) or perform actions linked to a user riding in the autonomous vehicle (12).

At this time, the robot (11) interacting with the autonomous vehicle (12) can control or assist the autonomous driving function of the autonomous vehicle (12) by acquiring sensor information on behalf of the autonomous vehicle (12) and providing it to the autonomous vehicle (12), or by acquiring sensor information and generating surrounding environment information or object information and providing it to the autonomous vehicle (12).

Alternatively, a robot (11) interacting with a self-driving vehicle (12) may monitor a user riding in the self-driving vehicle (12) or control the functions of the self-driving vehicle (12) through interaction with the user. For example, if the robot (11) determines that the driver is drowsy, it may activate the self-driving function of the self-driving vehicle (12) or assist in the control of the driving unit of the self-driving vehicle (12). Here, the functions of the self-driving vehicle (12) controlled by the robot (11) may include not only the self-driving function, but also functions provided by a navigation system or audio system equipped inside the self-driving vehicle (12).

Alternatively, a robot (11) interacting with an autonomous vehicle (12) may provide information to the autonomous vehicle (12) or assist functions from outside the autonomous vehicle (12). For example, the robot (11) may provide traffic information including signal information to the autonomous vehicle (12), such as a smart traffic light, or may interact with the autonomous vehicle (12) to automatically connect an electric charger to a charging port, such as an automatic electric charger for an electric vehicle.

<AI+Robot+XR>

Robots (11) can be implemented as guide robots, transport robots, cleaning robots, wearable robots, entertainment robots, pet robots, unmanned flying robots, drones, etc. by applying AI technology and XR technology.

A robot (11) to which XR technology is applied may refer to a robot that is the target of control/interaction within an XR image. In this case, the robot (11) is distinct from the XR device (13) and can be linked with each other.

When a robot (11) that is the target of control/interaction within an XR image obtains sensor information from sensors including a camera, the robot (11) or the XR device (13) can generate an XR image based on the sensor information, and the XR device (13) can output the generated XR image. In addition, the robot (11) can operate based on a control signal input through the XR device (13) or a user's interaction.

For example, a user can check an XR image corresponding to the viewpoint of a remotely connected robot (11) through an external device such as an XR device (13), and through interaction, adjust the autonomous driving path of the robot (11), control the operation or driving, or check information on surrounding objects.

<AI+Autonomous Driving+XR>

Autonomous vehicles (12) can be implemented as mobile robots, vehicles, unmanned aerial vehicles, etc. by applying AI technology and XR technology.

An autonomous vehicle (12) to which XR technology is applied may refer to an autonomous vehicle equipped with a means for providing XR images, an autonomous vehicle that is the subject of control/interaction within an XR image, etc. In particular, an autonomous vehicle (12) that is the subject of control/interaction within an XR image is distinct from an XR device (13) and can be linked with each other.

An autonomous vehicle (12) equipped with a means for providing XR images can obtain sensor information from sensors including cameras and output XR images generated based on the obtained sensor information. For example, the autonomous vehicle (12) can provide passengers with XR objects corresponding to real objects or objects on the screen by having a HUD to output XR images.

At this time, when the XR object is output to the HUD, at least a part of the XR object may be output so as to overlap with an actual object toward which the passenger's gaze is directed. On the other hand, when the XR object is output to a display provided inside the autonomous vehicle (12), at least a part of the XR object may be output so as to overlap with an object in the screen. For example, the autonomous vehicle (12) may output XR objects corresponding to objects such as a road, another vehicle, a traffic light, a traffic sign, a two-wheeled vehicle, a pedestrian, a building, etc.

When an autonomous vehicle (12) that is the target of control/interaction within an XR image obtains sensor information from sensors including a camera, the autonomous vehicle (12) or the XR device (13) can generate an XR image based on the sensor information, and the XR device (13) can output the generated XR image. In addition, the autonomous vehicle (12) can operate based on a control signal input through an external device such as the XR device (13) or a user's interaction.

[Augmented Reality Technology]

Extended reality (XR) is a general term for virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides real-world objects and backgrounds only as CG images, AR technology provides virtual CG images on top of images of real objects, and MR technology is a computer graphics technology that mixes and combines virtual objects in the real world.

MR technology is similar to AR technology in that it shows real objects and virtual objects together. However, there is a difference in that while AR technology uses virtual objects to complement real objects, MR technology uses virtual and real objects with equal characteristics.

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and devices to which XR technology is applied can be called XR devices.

Hereinafter, an electronic device providing augmented reality according to an embodiment of the present invention will be described. In particular, a projector applied to augmented reality and an electronic device including the same will be described in detail.

FIG. 2 is a block diagram showing the configuration of an extended reality electronic device according to an embodiment of the present invention.

Referring to FIG. 2, the extended reality electronic device (20) may include a wireless communication unit (21), an input unit (22), a sensing unit (23), an output unit (24), an interface unit (25), a memory (26), a control unit (27), and a power supply unit (28). The components illustrated in FIG. 1 are not essential for implementing the electronic device (20), and thus, the electronic device (20) described in this specification may have more or fewer components than the components listed above.

More specifically, among the above components, the wireless communication unit (21) may include one or more modules that enable wireless communication between the electronic device (20) and a wireless communication system, between the electronic device (20) and another electronic device, or between the electronic device (20) and an external server. In addition, the wireless communication unit (21) may include one or more modules that connect the electronic device (20) to one or more networks.

This wireless communication unit (21) may include at least one of a broadcast reception module, a mobile communication module, a wireless Internet module, a short-range communication module, and a location information module.

The input unit (22) may include a camera or a video input unit for inputting a video signal, a microphone or an audio input unit for inputting an audio signal, and a user input unit (e.g., a touch key, a mechanical key, etc.) for receiving information from a user. Voice data or image data collected by the input unit (22) may be analyzed and processed into a user's control command.

The sensing unit (23) may include one or more sensors for sensing at least one of information within the electronic device (20), information about the surrounding environment surrounding the electronic device (20), and user information.

For example, the sensing unit (23) may include at least one of a proximity sensor, an illumination sensor, a touch sensor, an acceleration sensor, a magnetic sensor, a G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor (IR sensor), a finger scan sensor, an ultrasonic sensor, an optical sensor (e.g., a photographing device), a microphone, a battery gauge, an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, a radiation detection sensor, a heat detection sensor, a gas detection sensor, etc.), and a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric recognition sensor, etc.). Meanwhile, the electronic device (20) disclosed in the present specification may utilize information sensed by at least two or more of these sensors in combination.

The output unit (24) is for generating output related to vision, hearing, or tactile sensations, and may include at least one of a display unit, an audio output unit, a haptic module, and an optical output unit. The display unit may be formed as a layer structure with a touch sensor or formed as an integral part, thereby implementing a touch screen. This touch screen may function as a user input means that provides an input interface between the augmented reality electronic device (20) and the user, and at the same time, provide an output interface between the augmented reality electronic device (20) and the user.

The interface unit (25) serves as a passageway between various types of external devices connected to the electronic device (20). Through the interface unit (25), the electronic device (20) can receive virtual reality or augmented reality content from an external device, and can perform mutual interaction by exchanging various input signals, sensing signals, and data.

For example, the interface unit (25) may include at least one of a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio I/O (Input/Output) port, a video I/O (Input/Output) port, and an earphone port.

In addition, the memory (26) stores data that supports various functions of the electronic device (20). The memory (26) can store a plurality of application programs (or applications) that run on the electronic device (20), data for the operation of the electronic device (20), and commands. At least some of these application programs can be downloaded from an external server via wireless communication. In addition, at least some of these application programs can exist on the electronic device (20) from the time of shipment for basic functions of the electronic device (20) (e.g., call reception, call transmission, message reception, call transmission).

In addition to operations related to the application program, the control unit (27) typically controls the overall operation of the electronic device (20). The control unit (27) can process signals, data, information, etc. input or output through the components discussed above.

In addition, the control unit (27) can control at least some of the components by driving the application program stored in the memory (26) to provide appropriate information to the user or process a function. Furthermore, the control unit (27) can operate at least two or more of the components included in the electronic device (20) in combination with each other to drive the application program.

In addition, the control unit (27) can detect the movement of the electronic device (20) or the user by using a gyroscope sensor, a gravity sensor, a motion sensor, etc. included in the sensing unit (23). Alternatively, the control unit (27) can detect an object approaching the electronic device (20) or the user by using a proximity sensor, a light sensor, a magnetic sensor, an infrared sensor, an ultrasonic sensor, a light sensor, etc. included in the sensing unit (23). In addition, the control unit (27) can also detect the movement of the user by using sensors provided in a controller that operates in conjunction with the electronic device (20).

Additionally, the control unit (27) can perform operations (or functions) of the electronic device (20) using an application program stored in the memory (26).

The power supply unit (28) receives external power or internal power under the control of the control unit (27) and supplies power to each component included in the electronic device (20). The power supply unit (28) includes a battery, and the battery may be provided in a built-in or replaceable form.

At least some of the above components may operate in cooperation with each other to implement the operation, control, or control method of the electronic device according to various embodiments described below. In addition, the operation, control, or control method of the electronic device may be implemented on the electronic device by driving at least one application program stored in the memory (26).

Hereinafter, an electronic device described as an example of the present invention will be described based on an embodiment applied to an HMD (Head Mounted Display). However, embodiments of the electronic device according to the present invention may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (personal digital assistants), a PMP (portable multimedia player), a navigation, a slate PC, a tablet PC, an ultrabook, and a wearable device. In addition to an HMD, the wearable device may include a smart watch, a contact lens, VR/AR/MR Glass, and the like.

FIG. 3 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

As illustrated in FIG. 3, an electronic device according to an embodiment of the present invention may include a frame (100), a projector device (200), and a display unit (300).

The electronic device may be provided as a glass type (smart glass). The glass type electronic device is configured to be worn on the head of the human body and may be provided with a frame (case, housing, etc.) (100) for this purpose. The frame (100) may be formed of a flexible material to facilitate wearing.

The frame (100) is supported on the head and provides a space for mounting various components. As illustrated, electronic components such as a projector device (200), a user input unit (130), or an audio output unit (140) may be mounted on the frame (100). In addition, a lens covering at least one of the left and right eyes may be detachably mounted on the frame (100).

The frame (100) may have a form of glasses worn on the face of the user's body as shown in the drawing, but is not necessarily limited thereto, and may also have a form such as goggles worn in close contact with the user's face.

Such a frame (100) may include a front frame (110) having at least one opening, and a pair of side frames (120) that extend in the y direction (in FIG. 2) intersecting the front frame (110) and are parallel to each other.

The frame (100) may have the same or different length (DI) in the x direction and length (LI) in the y direction.

The project device (200) is provided to control various electronic components provided in an electronic device. The project device (200) may be used interchangeably with ‘optical output device’, ‘optical projector device’, ‘light irradiation device’, ‘optical device’, etc.

The projector device (200) can generate an image or a video of a series of images that are displayed to the user. The projector device (200) can include an image source panel that generates an image and a plurality of lenses that diffuse and converge light generated from the image source panel.

The project device (200) may be secured to either of the two side frames (120). For example, the project device (200) may be secured to the inside or outside of either of the side frames (120), or may be integrally formed by being built into the inside of either of the side frames (120). Alternatively, the project device (200) may be secured to the front frame (110) or may be provided separately from the electronic device.

The display unit (300) may be implemented in the form of a head mounted display (HMD). The HMD form refers to a display method that is mounted on the head and directly shows an image in front of the user's eyes. When the user wears the electronic device, the display unit (300) may be positioned to correspond to at least one of the left and right eyes so that the image can be directly provided in front of the user's eyes. In this drawing, the display unit (300) is positioned in a portion corresponding to the right eye so that the image can be output toward the user's right eye. However, as described above, it is not limited thereto and may be positioned for both the left and right eyes.

The display unit (300) can allow the user to visually perceive the external environment while simultaneously allowing the user to see an image generated by the projector device (200). For example, the display unit (300) can project an image onto the display area using a prism.

And the display unit (300) may be formed to be translucent so that the projected image and the general field of view in front (the range that the user sees through his eyes) can be viewed simultaneously. For example, the display unit (300) may be translucent and may be formed of an optical member including glass.

And the display unit (300) may be inserted and fixed into an opening included in the front frame (110), or may be positioned on the back surface of the opening (i.e., between the opening and the user) and fixed to the front frame (110). In the drawing, the display unit (300) is positioned on the back surface of the opening and fixed to the front frame (110) as an example, but the display unit (300) may be positioned and fixed at various positions of the frame (100).

As illustrated in FIG. 2, when the electronic device projects image light from the projector device (200) to one side of the display unit (300), the image light is emitted to the other side through the display unit (300), allowing the user to see the image generated from the projector device (200).

Accordingly, the user can view the external environment through the opening of the frame (100) and at the same time view the image generated by the projector device (200). That is, the image output through the display unit (300) can be seen to overlap with the general field of view. By utilizing these display characteristics, the electronic device can provide augmented reality (AR) that superimposes a virtual image on a real image or background and shows it as a single image.

Furthermore, in addition to these drives, images generated from the external environment and the projector device (200) can be provided to the user with a time difference for a short period of time that is not recognized by the person. For example, in one frame, the external environment can be provided to the person in one section, and images from the projector device (200) can be provided to the person in another section.

Alternatively, both overlap and time difference may be provided.

In addition, the projector device according to the embodiment may have a structure described below, or may be formed of a structure further including a waveguide or/and glass in the structure. In addition, the projector device may include a DLP (Digital Light Processing) projector or a projector device.

The following display unit may be expressed as a light guide device. The light guide device according to the embodiment may correspond to the display unit included in the augmented reality electronic device according to the embodiment.

Figure 4 is a schematic diagram of a light guide device according to an embodiment of the present invention.

Referring to FIG. 4, the light guide device (300) according to the embodiment may include a first substrate (310), a first input diffraction element (320), a first transmission diffraction element (330), a first output diffraction element (340), and a cover (301).

The light guide device (300) can change the path of light that is output from the projector device and can output the light to the outside again. The light guide device (300) can output the light to the outside so that it reaches the user's eyes. The light can be sequentially input to the first input diffraction element (320), the first transmission diffraction element (330), and the first output diffraction element (340) and output to the outside again. The direction of incidence of the light to the light guide device (300) can be a direction perpendicular to the first substrate (310) or a direction forming a certain angle with the direction perpendicular to the first substrate (310).

The first substrate (310) can serve as a path for transmitting light. A first input diffractive element (320), a first transmission diffractive element (330), and a first output diffractive element (340) can be arranged on the first substrate (310). The light can be totally reflected inside the first substrate (310) and travel along the inside of the first substrate (310). The first substrate (310) can include a waveguide. The first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340) can be arranged spaced apart from each other on the first substrate (310).

The first substrate (310) may include a plurality of surfaces. The first substrate (310) may include a first surface and a second surface. The first surface may be a surface on which light is incident. In addition, the second surface may be a surface on which light is emitted. The second surface may be a surface spaced apart from the first surface. The first surface and the second surface may be parallel to each other. A first input diffraction element (320), a first transmission diffraction element (330), and a first output diffraction element (340) may be arranged on the first surface or the second surface.

The first input diffraction element (320) can serve as a path through which light is incident. The first input diffraction element (320) can be placed on the first substrate (310). Light can be incident from the outside to the light guide device (300) through the first input diffraction element (320) and transmitted through the first substrate (310). The first input diffraction element (320) can change the path of light by diffracting the light.

The first transmission diffraction element (330) can play a role in changing the path of light. The first transmission diffraction element (330) can be arranged on the first substrate (310). The first transmission diffraction element (330) can change the path of light incident through the first input diffraction element (320). The first transmission diffraction element (330) can change the path of light so that it is directed toward the first output diffraction element (340). The first transmission diffraction element (330) can change the path of light by diffracting the light.

The first exit diffraction element (340) can serve as a path through which light is emitted. The first exit diffraction element (340) can be arranged on the first substrate (310). Light can be emitted to the outside of the light guide device (300) through the first exit diffraction element (340). The first exit diffraction element (340) can receive light whose path has been changed from the first transmission diffraction element (330) and emit it to the outside. The first exit diffraction element (340) can change the path of light and emit it to the outside. The first exit diffraction element (340) can change the path of light by diffracting the light.

The cover (301) may be placed on the first substrate (310), the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340). The cover (301) may be placed adjacent to the projector (200) on the first substrate (310), the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340). Light may pass through the cover (301) and enter the first input diffractive element (320). The cover (301) may have an effect of protecting the interior of the light guide device (300).

The first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340) may include a plurality of protrusions. The plurality of protrusions may have constant widths, periods, and heights and may be arranged on the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340). The plurality of protrusions may protrude in a direction perpendicular to the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340). The plurality of protrusions may be arranged to be spaced apart from each other in a vector direction of a pattern including the protrusions. Depending on the widths, periods, and heights of the plurality of protrusions, the paths of light after passing through the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340) may be changed differently.

FIG. 5 is a drawing showing the angle of the substrate of the light guide device according to an embodiment of the present invention.

In FIG. 5, the first coordinate axis (x1, y1, z1) may be a coordinate axis set based on the user. The user's gaze direction may be defined as the z1 axis. The x1 axis and the y1 axis may be axes set in a direction perpendicular to the z1 axis. The x1 axis and the y2 axis may be perpendicular to each other. In addition, the second coordinate axis (x2, y2, z2) may be a coordinate axis set based on the light guide device. The direction perpendicular to the first substrate (310) of the light guide device may be defined as the z2 axis. The x2 axis and the y2 axis may be axes set in a direction perpendicular to the z2 axis. The x2 axis and the y2 axis may be perpendicular to each other.

Referring to FIG. 5a, the wrap angle (γ) may be defined as an angle formed by the first substrate (310) of the light guide device and the first direction (x1). The first direction (x1) may be a direction perpendicular to a direction in which a user views the light guide device. The direction in which the user views the light guide device may be a third direction (z1). The first direction (x1) may be a direction perpendicular to the third direction (z3).

Referring to FIG. 5b, a pantoscopic angle (α) may be defined as an angle formed by a first substrate (310) of the light guide device and a second direction (y1). The second direction (y1) may be a direction perpendicular to a direction in which a user views the light guide device. The second direction (y1) may be a direction perpendicular to the first direction (x1) and the third direction (z1).

The placement angle of the light guide device may vary depending on the wrap angle and pantoscope angle.

FIG. 6 is a drawing showing the angle between the projector and the substrate of the light guide device according to an embodiment of the present invention.

Referring to FIG. 6a, a first angle (θ _projector ) may be defined as an angle between the projector (200) and the first substrate (310). The angle between the projector (200) and the first substrate (310) may be an angle formed between a direction in which the projector (200) outputs light and a direction (z2) perpendicular to the first substrate (310). The first angle (θ _projector ) may be 0˚ to 90˚.

Referring to Fig. 6b, the second angle ( ) can be defined as the angle at which the projector (200) faces the first substrate (310). The angle at which the projector (200) faces the first substrate (310) can be the angle that the direction in which the projector (200) outputs light forms with the first axis (x2) on the first substrate (310). The first axis (x2) can be the long axis of the first substrate (310). The second angle ( ) may be an angle formed counterclockwise from the first axis (x2). The second angle ( ) can be between 0˚ and 360˚.

The arrangement relationship between the projector and the light guide device may vary depending on the first and second angles.

FIG. 7 is a drawing showing a grating pattern of a diffraction element of a light guide device according to an embodiment of the present invention.

Referring to FIG. 7, the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340) may each include a grating pattern in which a plurality of protrusions are repeatedly arranged. The first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340) may each include a plurality of protrusions, and the plurality of protrusions may be arranged in parallel and spaced apart from each other by a predetermined distance. In this case, the grating period of the diffractive element may be defined as the shortest distance between one side of the protrusion and one side of an adjacent protrusion. The grating period of the diffractive element may be the shortest distance between the same side surfaces of the protrusions. The grating vector of the diffractive element may be set in a direction perpendicular to the direction in which the protrusions are arranged. The grating angle of the diffractive element may be an angle that the grating vector of the diffractive element forms with the first axis (x2). Additionally, the grating angle of the diffractive element may be the angle formed by the separation direction between the protrusions of the diffractive element and the first axis (x2).

The first input diffractive element (320) may include a plurality of first protrusions (321). The grating period (λ _IC ) of the first input diffractive element (320) may be the shortest distance between one side of the first protrusion (321) and one side of an adjacent first protrusion (321). In addition, the grating period (λ _IC ) of the first input diffractive element (320) may be the shortest distance between the same side surfaces of adjacent first protrusions (321). The grating angle ( ) may be the angle formed by the grating vector of the first input diffraction element (320) with the first axis (x2). In addition, the grating angle ( ) may be an angle formed by the separation direction between the first protrusions (321) of the first input diffractive element (320) and the first axis (x2). The grating period (λ _IC ) of the first input diffractive element (320) may be 480 nm to 520 nm. For example, the grating period (λ _IC ) of the first input diffractive element (320) may be 500 nm. The grating angle ( ) can be 310˚ to 320˚. For example, the grating angle ( of the first input diffractive element (320) ) can be 315˚.

The first transmission diffraction element (330) may include a plurality of second protrusions (331). The grating period (λ _FG ) of the first transmission diffraction element (330) may be the shortest distance between one side of the second protrusion (331) and one side of the adjacent second protrusion (331). In addition, the grating period (λ _FG ) of the first transmission diffraction element (330) may be the shortest distance between the same side surfaces of the adjacent second protrusions (331). The grating angle ( ) may be the angle formed by the grating vector of the first transmission diffraction element (330) with the first axis (x2). In addition, the grating angle ( ) may be an angle formed by the separation direction between the second protrusions (331) of the first transmission diffraction element (330) and the first axis (x2). The grating period (λ _FG ) of the first transmission diffraction element (330) may be 380 nm to 420 nm. For example, the grating period (λ _FG ) of the first transmission diffraction element (330) may be 400 nm. The grating angle ( ) can be 65˚ to 75˚. For example, the grating angle ( of the first transmission diffraction element (330) ) can be 70˚.

The first emission diffraction element (340) may include a plurality of third protrusions (341). The grating period (λ _OC ) of the first emission diffraction element (340) may be the shortest distance between one side of the third protrusion (341) and one side of an adjacent third protrusion (341). In addition, the grating period (λ _OC ) of the first emission diffraction element (340) may be the shortest distance between the same side surfaces of adjacent third protrusions (341). The grating angle ( ) may be the angle formed by the grating vector of the first diffraction element (340) with the first axis (x2). In addition, the grating angle ( ) may be an angle formed by the separation direction between the third protrusions (341) of the first diffraction element (340) and the first axis (x2). The grating period (λ _OC ) of the first diffraction element (340) may be 360 nm to 400 nm. For example, the grating period (λ _OC ) of the first diffraction element (340) may be 378 nm. The grating angle ( ) can be 180˚ to 190˚. For example, the grating angle ( ) of the first diffractive element (340) ) can be 185.35˚.

The light guide device (300) according to the embodiment can satisfy mathematical expressions 1 and 2.

[Mathematical formula 1]

[Mathematical formula 2]

Here, θ _projector is the angle between the projector and the first substrate, is the angle at which the projector faces the first substrate, γ is the wrap angle of the first substrate, λ is the wavelength of light, α is the pantoscopic angle of the first substrate, Λ _IC is the grating period of the first input diffractive element, Λ _OC is the grating period of the first output diffractive element, Λ _FG is the grating period of the first transmission diffractive element, is the grating angle of the first input diffractive element, is the grating angle of the first diffractive element, is the grating angle of the first transmission diffractive element, FoV is the field of view of the light guide device, and x and y can be the resolutions of the light guide device. The field of view of the light guide device can be the angle at which light is incident on the first input diffractive element and transmitted to the first transmission diffractive element. It is possible to design a grating structure of the diffractive element that can be applied to all angles of the light guide device and the projector.

An optical guide device according to one embodiment is Λ _IC is 500nm, Λ _OC is 378 nm, Λ _FG is 400 nm, is 315˚, is 185.35˚, is 70˚, λ is 525nm, θ _projector is 5˚, can be 7˚, α can be 6˚, and γ can be 8˚.

Figure 8 is a schematic diagram of a light guide device according to another embodiment of the present invention.

Referring to FIG. 8, the light guide device (300) may further include a second substrate (350), a second input diffractive element (360), a second transmission diffractive element (370), and a second output diffractive element (380).

The second substrate (350) may be arranged spaced apart from the first substrate (310) in the direction of the optical axis. The second substrate (350) may be arranged at the rear end of the first substrate (310) on the path of light. The second input diffraction element (360), the second transmission diffraction element (370), and the second exit diffraction element (280) may be arranged on the second substrate (350). Light may be incident through the second input diffraction element (370) and may be exited through the second exit diffraction element (380). The second input diffraction element (360) may diffract light that passes through the first input diffraction element (320) without being diffracted by the first input diffraction element (320). The wrap angle of the first substrate and the wrap angle of the second substrate may be the same. In addition, the pantoscal angle of the first substrate and the pantoscal angle of the second substrate may be the same. The second input diffractive element (360) may diffract light having a different wavelength band from the first input diffractive element (320). Accordingly, the wavelength band of light transmitted through the second substrate (350) may be different from the wavelength band of light transmitted through the first substrate (310). Accordingly, light sequentially incident on the first input diffractive element, the first transmission diffractive element, and the first exit diffractive element may have a different wavelength from light sequentially incident on the second input diffractive element, the second transmission diffractive element, and the second exit diffractive element. Light having different wavelength bands may be emitted from the first exit diffractive element (340) and the second exit diffractive element (380), respectively, and may reach the user's eyes.

The grating angle of the first input diffractive element (320) and the grating angle of the second input diffractive element (360) are the same, the grating angle of the first transmission diffractive element (330) and the grating angle of the second transmission diffractive element (370) are the same, and the grating angles of the first exit diffractive element (340) and the second exit diffractive element (380) can be the same. As a result, light of different wavelength bands can be transmitted and output in the same manner.

The grating periods of the second input diffractive element (360), the second transmission diffractive element (370), and the second output diffractive element (380) may be different from the grating periods of the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340), respectively. Since the grating periods of the second input diffractive element (360), the second transmission diffractive element (370), and the second output diffractive element (380) are different from the grating periods of the first input diffractive element (320), the first transmission diffractive element (330), and the first output diffractive element (340), light of different wavelength bands can be diffracted.

The light guide device according to the embodiment can satisfy mathematical expressions 3 and 4.

[Mathematical Formula 3]

[Mathematical formula 4]

Here, θ _projector is the angle between the projector and the second substrate, is the angle at which the projector faces the second substrate, γ is the wrap angle of the second substrate, λ is the wavelength of light, α is the pantoscopic angle of the second substrate, Λ _IC is the grating period of the second input diffractive element, Λ _OC is the grating period of the second output diffractive element, Λ _FG is the grating period of the second transmission diffractive element, is the grating angle of the second input diffractive element, is the grating angle of the second diffraction element, is the grating angle of the second transmission diffractive element, FoV is the viewing angle of the light guide device, x and y can be the resolutions of the light guide device. It is possible to design a grating structure of the diffractive element that can be applied to all angles of the light guide device and the projector.

Although the above has been described with reference to examples, these are merely examples and do not limit the present invention. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

200: Projector
300: Light guide device
310: 1st substrate
320: First input diffractive element
330: First transmission diffraction element
340: 1st diffractive element

Claims (15)

first substrate; and
It comprises a first input diffraction element, a first transmission diffraction element and a first output diffraction element, which are arranged on the first substrate and onto which light emitted from the project is sequentially incident;
An optical guide device satisfying mathematical expressions 1 and 2.
[Mathematical Formula 1]

[Mathematical formula 2]

(Here, θ _projector is the angle between the projector and the first substrate, is the angle at which the projector faces the first substrate, γ is the wrap angle of the first substrate, λ is the wavelength of light, α is the pantoscopic angle of the first substrate, Λ _IC is the grating period of the first input diffractive element, Λ _OC is the grating period of the first output diffractive element, Λ _FG is the grating period of the first transmission diffractive element, is the grating angle of the first input diffractive element, is the grating angle of the first diffractive element, is the grating angle of the first transmission diffraction element, FoV is the field of view of the light guide device, x and y are the resolutions of the light guide device.) In the first paragraph,
The wrap angle of the first substrate is the angle that the first substrate forms with the first direction,
A light guide device in which the first direction is perpendicular to the direction in which the user views the light guide device. In the second paragraph,
The pantospheric angle of the first substrate is the angle formed by the first substrate with the second direction,
A light guide device wherein the second direction is a direction perpendicular to the first direction and the direction in which the user views the light guide device. In the first paragraph,
A light guide device in which the angle between the projector and the first substrate is the angle formed between the direction in which the projector outputs the light and a plane perpendicular to the first substrate. In the first paragraph,
The angle at which the projector is directed on the first substrate is the angle at which the direction in which the projector outputs the light forms with the first axis on the first substrate,
An optical guide device in which the first axis is the long axis of the first substrate. In the first paragraph,
The first input diffractive element comprises a first protrusion, the first transmission diffractive element comprises a second protrusion, and the first output diffractive element comprises a third protrusion.
A light guide device in which the grating period of the first input diffractive element is the shortest distance between the same side surfaces of adjacent first protrusions, the grating period of the first transmission diffractive element is the shortest distance between the same side surfaces of adjacent second protrusions, and the grating period of the first output diffractive element is the shortest distance between the same side surfaces of adjacent third protrusions. In paragraph 5,
A light guide device wherein the grating angle of the first input diffractive element is the angle formed by the separation direction between the first protrusions of the first input diffractive element and the first axis, the grating angle of the first transmission diffractive element is the angle formed by the separation direction between the second protrusions of the first transmission diffractive element and the first axis, and the grating angle of the first exit diffractive element is the angle formed by the separation direction between the third protrusions of the first exit diffractive element and the first axis. In the first paragraph,
A second substrate arranged to overlap the first substrate;
An optical guide device further comprising a second input diffraction element, a second transmission diffraction element, and a second output diffraction element, which are arranged on the second substrate and onto which light is sequentially incident. In Article 8,
A light guide device wherein the grating angles of the first input diffractive element and the second input diffractive element are the same, the grating angles of the first transmission diffractive element and the second transmission diffractive element are the same, and the grating angles of the first exit diffractive element and the second exit diffractive element are the same. In the first paragraph,
A light guide device in which the viewing angle of the light guide device is the angle at which the light is incident on the first input diffraction element and transmitted to the first transmission diffraction element. In Article 9,
A light guide device wherein the grating periods of the second input diffractive element, the second transmission diffractive element, and the second output diffractive element are each different from the grating periods of the first input diffractive element, the first transmission diffractive element, and the first output diffractive element. In Article 11,
An optical guide device satisfying mathematical expressions 3 and 4.
[Mathematical Formula 3]

[Mathematical Formula 4]

(Here, θ _projector is the angle between the projector and the second substrate, is the angle at which the projector faces the second substrate, γ is the wrap angle of the second substrate, λ is the wavelength of light, α is the pantoscopic angle of the second substrate, Λ _IC is the grating period of the second input diffractive element, Λ _OC is the grating period of the second output diffractive element, Λ _FG is the grating period of the second transmission diffractive element, is the grating angle of the second input diffractive element, is the grating angle of the second diffraction element, is the grating angle of the second transmission diffraction element, FoV is the field of view of the light guide device, x and y are the resolutions of the light guide device.) In Article 12,
The wrap angle of the first substrate and the wrap angle of the second substrate are the same light guide device. In Article 12,
The pantospheric angle of the first substrate and the pantospheric angle of the second substrate are the same light guide device. In Article 12,
A light guide device in which light sequentially incident on the first input diffraction element, the first transmission diffraction element, and the first output diffraction element has a different wavelength from light sequentially incident on the second input diffraction element, the second transmission diffraction element, and the second output diffraction element.

Images