Project equipment and electronic devices including the same

Abstract

An embodiment discloses a projection device including a light guide; a first light source disposed on a first side of the light guide; a lens group disposed on a fourth side of the light guide; and a first side lens disposed between the first side of the light guide and the first light source; the lens group includes a first lens to an Nth lens, the first lens is disposed farthest from the fourth side of the light guide, the first side of the light guide overlaps with the fourth side of the light guide in the optical axis direction of the lens group, and the first side lens and the Nth lens are in contact with the light guide.

Description

[Technical Field]

[0001] The embodiments relate to project apparatus and electronic devices including the same. [Background technology]

[0002] Virtual reality (VR) refers to a specific environment or situation that is similar to reality but is not real, created using artificial technology such as a computer, or the technology itself.

[0003] Augmented reality (AR) is a technology that synthesizes virtual objects and information into the real environment, making them appear as if they actually exist in the real environment.

[0004] Mixed reality (MR) or hybrid reality refers to the combination of the virtual and real worlds to create new environments and information. In particular, it refers to the ability to interact in real time between real and virtual objects.

[0005] The virtual environments and situations created stimulate the user's five senses, allowing them to experience space and time similar to reality, thereby freely moving between reality and imagination. In addition to simply being immersed in the environment, users can also interact with the objects in the environment by using real devices to operate and give commands.

[0006] Recently, research into gear and devices used in this field has been actively conducted, but there is an increasing need for miniaturization and improved optical performance of such devices. Summary of the Invention [Problem to be solved by the invention]

[0007] The embodiment provides a projection device and an electronic device including the same for use in AR (Augmented Reality), etc., in which a lens is bonded to the surface where light exits the light guide, preventing total reflection from occurring on the outer surface of the light guide (e.g., prism), thereby eliminating stray light.

[0008] It also provides projectors and electronic devices with reduced TTL.

[0009] The problems to be solved by the examples are not limited to these, and may also include the objectives and effects that can be grasped from the means for solving the problems and embodiments described below. [Means for solving the problem]

[0010] The projection device of the embodiment includes a light guide; a first light source arranged on a first side of the light guide; a lens group arranged on a fourth side of the light guide; and a first side lens arranged between the first side of the light guide and the first light source; the lens group includes a first lens to an Nth lens, the first lens is arranged farthest from the fourth side of the light guide, the first side of the light guide overlaps with the fourth side of the light guide in the optical axis direction of the lens group, and the first side lens and the Nth lens can contact the light guide.

[0011] The Nth lens may be disposed closest to the light guide in the lens group.

[0012] The light guide may include a second light source disposed on a second side of the light guide; a third light source disposed on a third side of the light guide; a second-side lens disposed between the second side of the light guide and the second light source; and a third-side lens disposed between the third side of the light guide and the third light source.

[0013] The first lens may have a bulging surface adjacent to the first light source, the second lens may have a bulging surface adjacent to the second light source, and the third lens may have a bulging surface adjacent to the third light source, and the first lens, the second lens, and the third lens may have the same radius of curvature on the surfaces adjacent to each light source.

[0014] A first optical axis of the light guide for the first side and the fourth side may be perpendicular to a second optical axis of the light guide for the second side and the third side.

[0015] The maximum distance from the first lens to the first light source may be less than or equal to twice the focal length of the lens group, the light guide, and the first side lens.

[0016] The first lens may have a surface facing the light guide that bulges in a direction opposite to the direction facing the light guide.

[0017] The size of the light guide may be larger than the size of the light source.

[0018] The size of the first side lens may be smaller than the size of the first side of the light guide.

[0019] The size or effective diameter of the light guide may be larger than the size or effective diameter of at least one of the first to Nth lenses of the lens group. [Effects of the Invention]

[0020] In the embodiment, when using a projection device used in AR (Augmented Reality) and an electronic device including the same, a lens is bonded to the surface where light exits from the light guide, so that total reflection does not occur on the outer surface of the light guide (e.g., prism), thereby realizing a projection device and an electronic device that removes stray light.

[0021] In addition, projectors and electronic devices with reduced TTL can be realized.

[0022] Furthermore, it is possible to realize a projection apparatus and an electronic device in which the occurrence of flare is minimized and the light source can be easily miniaturized.

[0023] The various beneficial advantages and effects of the present invention are not limited to the above, but will be more easily understood in the course of describing specific embodiments of the present invention. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a conceptual diagram showing an embodiment of an AI device.

[0025] [Figure 2] 1 is a block diagram showing a configuration of an augmented reality electronic device according to an embodiment of the present invention.

[0026] [Figure 3] 1 is a perspective view of an augmented reality electronic device according to a first embodiment of the present invention;

[0027] [Figure 4] 3A to 3C are conceptual diagrams illustrating various display modes applicable to a display unit according to an embodiment of the present invention.

[0028] [Figure 5] 3A to 3C are conceptual diagrams illustrating various display modes applicable to a display unit according to an embodiment of the present invention.

[0029] [Figure 6] 3A to 3C are conceptual diagrams illustrating various display modes applicable to a display unit according to an embodiment of the present invention.

[0030] [Figure 7] FIG. 1 is a perspective view of a projector device according to an embodiment.

[0031] [Figure 8] 1 is an exploded perspective view of a projector device according to an embodiment;

[0032] [Figure 9] 10 is a diagram illustrating the combination of an outer lens, a first spacer, a light guide, a lens, and a second spacer as a barrel in a projection device according to an embodiment.

[0033] [Figure 10] 10 is a diagram illustrating a connection between a barrel, a housing, and an additional housing in a projector device according to an embodiment.

[0034] [Figure 11] 1 is a diagram illustrating a connection between a housing and a light source unit in a projection device according to an embodiment.

[0035] [Figure 12] 1 is a diagram illustrating an optical system of a projection device according to a first embodiment.

[0036] [Figure 13] 10 is a perspective view of a light guide, a fourth lens, and a side lens in a projection device according to an embodiment. FIG.

[0037] [Figure 14] FIG. 10 is another perspective view of the light guide, the fourth lens, and the side lens in the projection device according to the embodiment.

[0038] [Figure 15] 10 is a diagram of an optical system of a projection device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0039] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0040] However, the technical concept of the present invention is not limited to the described embodiments and may be embodied in various different forms, and one or more of the components of the embodiments may be selectively combined or substituted within the scope of the technical concept of the present invention.

[0041] Furthermore, unless otherwise clearly defined and described, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted in a way that would be commonly understood by a person of ordinary skill in the art to which the present invention belongs, and commonly used terms, such as dictionary-defined terms, may be interpreted in light of the contextual meaning of the relevant art.

[0042] Furthermore, the terms used in the embodiments of the present invention are intended to explain the embodiments and are not intended to limit the present invention.

[0043] In this specification, the singular can also include the plural unless otherwise specified in the context, and when it is stated as "A and (and) at least one (or more) of B and C," it can include one or more of all possible combinations of A, B, and C.

[0044] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of embodiments of the present invention.

[0045] Such terms are merely used to distinguish a component from other components, and are not intended to limit the nature, order, or sequence of the components.

[0046] Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, it can include not only cases where the component is directly coupled, coupled, or connected to the other component, but also cases where the component is "coupled," "coupled," or "connected" by yet another component between the component and the other component.

[0047] Furthermore, when something is described as being formed or disposed "above or below" a component, "above" or "below" includes not only the case where two components are in direct contact with each other, but also the case where one or more other components are formed or disposed between the two components. Furthermore, when something is expressed as "above or below," it can mean not only the upper direction but also the lower direction based on one component.

[0048] FIG. 1 is a conceptual diagram showing an embodiment of an AI device.

[0049] 1, the AI ​​system includes at least one of an AI server 16, a robot 11, an autonomous vehicle 12, an XR device 13, a smartphone 14, and a home appliance 15 connected to a cloud network 10. Here, the robot 11, the autonomous vehicle 12, the XR device 13, the smartphone 14, and the home appliance 15 to which AI technology is applied may be referred to as the AI ​​devices 11 to 15.

[0050] The cloud network 10 may refer to a network that constitutes a part of a cloud computing infrastructure or exists within a cloud computing infrastructure, and may be configured using a 3G network, a 4G or LTE (Long Term Evolution) network, a 5G network, or the like.

[0051] That is, the devices 11 to 16 constituting the AI ​​system can be connected through the cloud network 10. In particular, the devices 11 to 16 can communicate with each other through a base station, or can communicate with each other directly without going through a base station.

[0052] The AI ​​server 16 may include a server that performs AI processing and a server that performs calculations on big data.

[0053] The AI ​​server 16 is connected to at least one of the AI ​​devices that make up the AI ​​system, namely, a robot 11, an autonomous vehicle 12, an XR device 13, a smartphone 14, or a home appliance 15, via a cloud network 10, and can assist in at least part of the AI ​​processing of the connected AI devices 11 to 15.

[0054] At this time, the AI ​​server 16 can train the artificial neural network using a machine learning algorithm instead of the AI ​​devices 11 to 15, and can directly store or transmit the learned model to the AI ​​devices 11 to 15.

[0055] At this time, the AI ​​server 16 receives input data from the AI ​​devices 11 to 15, infers a result value for the received input data using a learning model, and generates a response or control command based on the inferred result value and transmits it to the AI ​​devices 11 to 15.

[0056] Alternatively, the AI ​​devices 11 to 15 may use a direct learning model to infer a result value for input data, and generate a response or control command based on the inferred result value.

[0057] <AI+ロボット>

[0058] The robot 11 can be realized as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, etc. by applying AI technology.

[0059] The robot 11 may include a robot control module for controlling its operation, and the robot control module may refer to a software module or a chip that embodies the same in hardware.

[0060] The robot 11 can use sensor information acquired from various types of sensors to acquire status information of the robot 11, detect (recognize) the surrounding environment and objects, generate map data, determine a movement route and driving plan, determine a response to user interaction, and determine its actions.

[0061] Here, the robot 11 can use sensor information acquired by at least one of a lidar, a radar, and a camera to determine a movement path and a travel plan.

[0062] The robot 11 can perform the above-described actions using a learning model configured with at least one artificial neural network. For example, the robot 11 can recognize the surrounding environment and objects using the learning model, and can determine actions using the recognized surrounding environment information or object information. Here, the learning model can be learned directly by the robot 11 or can be learned by an external device such as the AI ​​server 16.

[0063] At this time, the robot 11 may generate results and perform an action directly using a learning model, or may transmit sensor information to an external device such as an AI server 16, receive the results generated thereby, and perform an action.

[0064] The robot 11 determines a movement route and a driving plan using at least one of map data, object information detected from sensor information, or object information acquired from an external device, and controls the driving unit to make the robot 11 move according to the determined movement route and driving plan.

[0065] The map data may include object identification information for various objects located in the space in which 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. The object identification information may include names, types, distances, locations, etc.

[0066] In addition, the robot 11 can perform operations or travel by controlling the drive unit based on the control / interaction of the user. At this time, the robot 11 can obtain the intention information of the interaction by the user's actions or voice utterances, and determine a response based on the obtained intention information to perform an operation.

[0067] <AI + Autonomous Driving>

[0068] The autonomous driving vehicle 12 can be embodied in a mobile robot, a vehicle, an unmanned aerial vehicle, etc. by applying AI technology.

[0069] The autonomous driving vehicle 12 can include an autonomous driving control module for controlling the autonomous driving function. The autonomous driving control module can mean a software module or a chip embodying this in hardware. The autonomous driving control module may be included inside as a component of the autonomous driving vehicle 12, or may be separately configured with separate hardware outside the autonomous driving vehicle 12 and connected.

[0070] The autonomous driving vehicle 12 can use the sensor information obtained from various types of sensors to obtain the state information of the autonomous driving vehicle 12, detect (recognize) the surrounding environment and objects, generate map data, determine a movement path and a travel plan, and determine an operation.

[0071] Here, in order to determine the movement path and the travel plan, the autonomous driving vehicle 12 can use the sensor information obtained by at least one or more sensors among a lidar, a radar, and a camera, similar to the robot 11.

[0072] In particular, for the environment and objects in an area where the field of view of the autonomous driving vehicle 12 is blocked or in an area beyond a certain distance, the autonomous driving vehicle 12 can receive and recognize sensor information from an external device, or receive the information directly recognized by the external device.

[0073] The autonomous vehicle 12 can perform the above-described operations using a learning model configured with at least one artificial neural network. For example, the autonomous vehicle 12 can recognize the surrounding environment and objects using the learning model, and can determine a driving path using the recognized surrounding environment information or object information. Here, the learning model can be trained directly by the autonomous vehicle 12 or can be trained by an external device such as the AI ​​server 16.

[0074] At this time, the autonomous vehicle 12 may generate results and perform operations using a direct learning model, or may transmit sensor information to an external device such as an AI server 16, receive the results generated thereby, and perform operations.

[0075] The autonomous vehicle 12 determines a travel route and a travel plan using at least one of map data, object information detected from sensor information, or object information acquired from an external device, and controls the driving unit to drive the autonomous vehicle 12 according to the determined travel route and travel plan.

[0076] The map data may include object identification information for various objects located in a space (e.g., a road) in which the autonomous vehicle 12 travels. For example, the map data may include object identification information for fixed objects such as street lights, rocks, and buildings, and movable objects such as vehicles and pedestrians. The object identification information may include name, type, distance, location, etc.

[0077] Furthermore, the autonomous vehicle 12 can perform an action or move by controlling the driving unit based on the control / interaction of the user. At this time, the autonomous vehicle 12 can acquire intention information of the interaction through the user's action or voice utterance, determine a response based on the acquired intention information, and perform an action.

[0078] <AI+XR>

[0079] The XR device 13 is implemented in an HMD (Head-Mount Display), a HUD (Head-Up Display) equipped in a vehicle, a TV, a mobile phone, a smartphone, a computer, a wearable device, a household appliance, a digital signage, a vehicle, a stationary robot, a mobile robot, etc. with AI technology applied thereto.

[0080] The XR device 13 can obtain information on the 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 position data and attribute data for 3D points, and render and output an XR object that outputs the information. For example, the XR device 13 can output an XR object including additional information for a recognized object corresponding to the recognized object.

[0081] The XR device 13 can perform the above 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 directly learned in the XR device 13 or learned in an external device such as the AI server 16.

[0082] At this time, the XR device 13 may generate a result using a direct learning model and perform operations, or may transmit sensor information to an external device such as the AI server 16, receive the result generated thereby, and perform operations

[0083] <AI + Robot + Autonomous Driving>

[0084] The robot 11 is implemented in a guiding robot, a transporting robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, a drone, etc. with AI technology and autonomous driving technology applied thereto.

[0085] The robot 11 to which AI technology and autonomous driving technology are applied may refer to a robot itself with an autonomous driving function, or a robot 11 that interacts with an autonomous driving vehicle 12, etc.

[0086] The robot 11 having an autonomous traveling function can be commonly called a device that moves along a given path by itself without user control, or that moves by determining its own path.

[0087] The robot 11 and the autonomous vehicle 12 having an autonomous driving function may use a common sensing method to determine one or more of a travel path or a travel plan. For example, the robot 11 and the autonomous vehicle 12 having an autonomous driving function may determine one or more of a travel path or a travel plan using information sensed through a lidar, a radar, or a camera.

[0088] The robot 11 that interacts with the autonomous vehicle 12 exists separately from the autonomous vehicle 12, but can be linked to the autonomous driving function inside or outside the autonomous vehicle 12 or can perform operations linked to a user on board the autonomous vehicle 12.

[0089] 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.

[0090] Alternatively, the robot 11 interacting with the autonomous vehicle 12 may monitor the user aboard the autonomous vehicle 12 or control the functions of the autonomous vehicle 12 through interaction with the user. For example, if the robot 11 determines that the driver is dozing, it may activate the autonomous driving function of the autonomous vehicle 12 or assist in controlling the drive unit of the autonomous vehicle 12. Here, the functions of the autonomous vehicle 12 controlled by the robot 11 may include not only the autonomous driving function but also functions provided by a navigation system or an audio system installed inside the autonomous vehicle 12.

[0091] Alternatively, the robot 11 that interacts with the autonomous vehicle 12 may provide information or assist functions to the autonomous vehicle 12 outside the autonomous vehicle 12. For example, the robot 11 may provide traffic information, including traffic signal information, to the autonomous vehicle 12 like a smart traffic light, or may interact with the autonomous vehicle 12 like an automatic electric charger for an electric vehicle, automatically connecting an electric charger to a charging port.

[0092] <AI+ロボット+XR>

[0093] The robot 11 may be embodied as a guide robot, a transport robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned flying robot, a drone, etc. by applying AI technology and XR technology.

[0094] The 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 may be separated from the XR device 13 and may be linked to each other.

[0095] When the robot 11 that is the object of control / interaction within the XR image acquires 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. And such a robot 11 can operate based on a control signal input through the XR device 13 or the interaction of the user.

[0096] For example, the user can remotely check an XR image corresponding to the viewpoint of the robot 11 linked through an external device such as the XR device 13, adjust the autonomous driving path of the robot 11 through interaction, control the operation or driving, or check the information of surrounding objects.

[0097] [[ID=Z]]<AI+Autonomous Driving+XR>

[0098] The autonomous driving vehicle 12 can be embodied in a mobile robot, a vehicle, an unmanned aerial vehicle, etc. with AI technology and XR technology applied.

[0099] The autonomous driving vehicle 12 with the means of providing an XR image can mean an autonomous driving vehicle equipped with means of providing an XR image, an autonomous driving vehicle that is the object of control / interaction within the XR image, etc. In particular, the autonomous driving vehicle 12 that is the object of control / interaction within the XR image is distinguished from the XR device 13 and can be interlocked with each other.

[0100] The autonomous driving vehicle 12 equipped with means of providing an XR image can acquire sensor information from sensors including a camera and output an XR image generated based on the acquired sensor information. For example, the autonomous driving vehicle 12 can provide an XR object corresponding to a real object or an object on the screen to the passengers by outputting an XR image with a HUD.

[0101] In this case, when an XR object is output to a HUD, at least a portion of the XR object may be output to overlap with an actual object toward which the passenger's gaze is directed. Conversely, when an XR object is output to a display provided inside the autonomous vehicle 12, at least a portion of the XR object may be output to overlap with an object on the screen. For example, the autonomous vehicle 12 may output XR objects corresponding to objects such as a roadway, other vehicles, traffic lights, traffic signs, motorcycles, pedestrians, buildings, etc.

[0102] When the autonomous vehicle 12, which is the target of control / interaction within the XR image, acquires 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. The autonomous vehicle 12 can then operate based on a control signal input through an external device such as the XR device 13 or user interaction.

[0103] [Augmented reality technology]

[0104] Cross reality (XR: eXtended Reality) 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 combines and presents virtual objects in the real world.

[0105] MR technology is similar to AR technology in that it allows both real and virtual objects to be displayed, but the difference is that in AR technology, virtual objects are used to complement real objects, while in MR technology, virtual and real objects are used with equal characteristics.

[0106] XR technology can be applied to HMDs (Head-Mount Displays), HUDs (Head-Up Displays), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and devices to which XR technology is applied can be called XR devices.

[0107] Hereinafter, an electronic device that provides augmented reality according to an embodiment of the present invention will be described in detail. In particular, a projector applied to augmented reality and an electronic device including the same will be described in detail.

[0108] FIG. 2 is a block diagram showing the configuration of an augmented reality electronic device 20 according to an embodiment of the present invention.

[0109] 2, the augmented 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. 2 are not essential for realizing the electronic device 20, and the electronic device 20 described herein may have more or fewer components than those described above.

[0110] More specifically, the wireless communication unit 21 among the components 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. The wireless communication unit 21 may also include one or more modules that connect the electronic device 20 to one or more networks.

[0111] The wireless communication unit 21 may include at least one of a broadcast receiving module, a mobile communication module, a wireless Internet module, a short-range communication module, and a location information module.

[0112] The input unit 22 may include a camera or video input unit for inputting a video signal, a microphone or audio input unit for inputting an audio signal, and a user input unit (e.g., touch keys, mechanical keys, etc.) for receiving information input from a user. The voice data and image data collected by the input unit 22 may be analyzed and processed as a user control command.

[0113] 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.

[0114] 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 gravity sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor (IR sensor), a fingerprint sensor, an ultrasonic sensor, an optical sensor (e.g., a photographing unit), a microphone, a battery gauge, an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, a radiation sensor, a heat sensor, a gas sensor, etc.), and a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the electronic device 20 disclosed herein may combine and utilize information sensed by at least two or more of these sensors.

[0115] The output unit 24 generates an output related to vision, hearing, or touch, 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 layered with a touch sensor or may be integrally formed with the touch sensor to implement a touch screen. Such a touch screen may function as a user input means that provides an input interface between the augmented reality electronic device 20 and a user, and may also provide an output interface between the augmented reality electronic device 20 and a user.

[0116] The interface unit 25 serves as a passageway between the electronic device 20 and 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 the external devices and can perform mutual interaction by exchanging various input signals, sensing signals, and data.

[0117] 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.

[0118] The memory 26 also stores data supporting various functions of the electronic device 20. The memory 26 may store a number of application programs (or applications) run by the electronic device 20, as well as data and commands for the operation of the electronic device 20. At least some of these application programs may be downloaded from an external server via wireless communication. At least some of these application programs may be present on the electronic device 20 from the time of shipment for the basic functions of the electronic device 20 (e.g., incoming call, outgoing call, message receiving, and outgoing call functions).

[0119] 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 above-mentioned components.

[0120] In addition, the control unit 27 can control at least some of the components to provide appropriate information to a user or process functions by running an application program stored in the memory 26. Furthermore, the control unit 27 can operate at least two or more components included in the electronic device 20 in combination with each other to run an application.

[0121] In addition, the control unit 27 may sense the movement of the electronic device 20 or the user using a gyroscope sensor, a gravity sensor, a motion sensor, etc. included in the sensing unit 23. Alternatively, the control unit 27 may sense an object approaching the electronic device 20 or the user's vicinity using a proximity sensor, an illuminance sensor, a magnetic sensor, an infrared sensor, an ultrasonic sensor, an optical sensor, etc. included in the sensing unit 23. In addition, the control unit 27 may sense the movement of the user through a sensor provided in a controller that operates in conjunction with the electronic device 20.

[0122] In addition, the control unit 27 can perform the operation (or function) of the electronic device 20 using an application program stored in the memory 26 .

[0123] Under the control of the control unit 27, the power supply unit 28 receives an external or internal power source and supplies power to each component included in the electronic device 20. The power supply unit 28 includes a battery, which may be built-in or replaceable.

[0124] At least some of the components may cooperate 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 running at least one application program stored in memory 26.

[0125] 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 mobile phones, smartphones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, slate PCs, tablet PCs, ultrabooks, and wearable devices. In addition to HMDs, wearable devices may also include smart watches, contact lenses, VR / AR / MR Glasses, and the like.

[0126] FIG. 3 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

[0127] As shown in FIG. 3, the electronic device according to the embodiment of the present invention may include a frame 100, a projector 200, and a display unit 300.

[0128] The electronic device may be provided as glasses (smart glasses). The glasses-type electronic device is configured to be wearable on the head of a human body, and for this purpose may be provided with a frame (case, housing, etc.) 100. The frame 100 may be made of a flexible material so that it is easy to wear.

[0129] The frame 100 is supported on the head and has a space for mounting various components. As shown, electronic components such as a projector 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 removably mounted on the frame 100.

[0130] As shown in the drawings, the frame 100 may have the form of glasses worn on the face of the user's body, but is not limited thereto and may have the form of goggles worn in close contact with the user's face.

[0131] Such a frame 100 may include a front frame 110 having at least one opening, and a pair of side frames 120 extending in the y direction (in FIG. 3) intersecting the front frame 110 and aligned with each other.

[0132] Frame 100 may have the same or different lengths DI in the x-direction and LI in the y-direction.

[0133] The project device 200 is configured to control various electronic components included in an electronic device. The project device 200 may be referred to interchangeably as a "light output device," a "light projecting device," a "light irradiating device," an "optical device," and the like.

[0134] The projector device 200 can generate an image or a series of images visible to a user. The projector device 200 can include an image source panel that generates an image and a plurality of lenses that diffuse and converge the light generated by the image source panel.

[0135] The projector device 200 may be fixed to one of the two side frames 120. For example, the projector device 200 may be fixed to the inside or outside of one of the side frames 120, or may be integrally formed inside one of the side frames 120. Alternatively, the projector device 200 may be fixed to the front frame 110 or provided separately from the electronic device.

[0136] 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 worn on the head and displays images directly in front of the user's eyes. When a user wears an electronic device, the display unit 300 may be disposed to correspond to at least one of the left and right eyes so as to provide images directly in front of the user's eyes. In this drawing, the display unit 300 is disposed in a position corresponding to the right eye so as to output images to the user's right eye. However, as described above, the present invention is not limited to this and may be disposed in both the left and right eyes.

[0137] The display unit 300 allows a user to visually recognize the external environment while simultaneously viewing an image generated by the projection device 200. For example, the display unit 300 may project an image onto a display area using a prism.

[0138] The display unit 300 may be formed to be translucent so that the projected image and the general field of view in front of the user (the range the user looks through the eyes) can be seen simultaneously. For example, the display unit 300 may be translucent and may be formed of an optical member including glass.

[0139] The display unit 300 may be inserted into an opening included in the front frame 110 and fixed thereto, or may be located behind the opening (i.e., between the opening and the user) and fixed thereto. Although the drawings show an example in which the display unit 300 is located behind the opening and fixed to the front frame 110, the display unit 300 may be disposed and fixed at various positions on the frame 110.

[0140] As shown in FIG. 3, when the image light for an image from the projector 200 is incident on one side of the display unit 300, the image light is emitted to the other side through the display unit 300, thereby making the image generated by the projector 200 visible to the user.

[0141] As a result, the user can view the external environment through the opening of the frame 100 while simultaneously viewing the image generated by the projection device 200. That is, the image output through the display unit 300 can be seen overlapping with the general field of view. By utilizing these display characteristics, the electronic device can provide augmented reality (AR), which overlays a virtual image on a real image or background to display it as a single image.

[0142] Furthermore, for a short period of time that is not perceptible to humans except for this driving, the external environment and the image generated by the project device 200 may be provided to the user with a time lag. For example, within one frame, the external environment may be provided to the user in one section, and an image from the project device 200 may be provided to the user in another section.

[0143] Alternatively, both overlap and lag may be provided.

[0144] 4 to 6 are conceptual diagrams illustrating various display methods applicable to the display unit according to the embodiment of the present invention.

[0145] Specifically, FIG. 4 is a diagram for explaining an embodiment of a prism-type optical element, FIG. 5 is a diagram for explaining an embodiment of a waveguide-type optical element, and FIG. 6 is a diagram for explaining an embodiment of a surface reflection-type optical element.

[0146] As shown in FIG. 4, a prism-type optical member may be used in the display unit 300-1 according to an embodiment of the present invention.

[0147] As an example, the prism-type optical element may be a flat-type glass optical element in which the surface where the image light enters and the surface where the image light exits 300a are flat, as shown in FIG. 4(a), or a freeform glass optical element in which the surface where the image light exits 300b is curved without a fixed radius of curvature, as shown in FIG. 4(b).

[0148] The flat-type glass optical element allows image light generated by the projection device 200 to enter the flat side, be reflected by the total reflection mirror 300a provided inside, and be emitted toward the user. Here, the total reflection mirror 300a provided inside the flat-type glass optical element can be formed inside the flat-type glass optical element by a laser.

[0149] The freeform glass optical element is configured so that its thickness decreases as it moves away from the incident surface, allowing the image light generated by the projection device 200 to be incident on the curved side, undergo total internal reflection, and exit toward the user.

[0150] As shown in FIG. 5, a display unit 300-2 according to another embodiment of the present invention may use a waveguide type optical element or a light guide optical element (LOE).

[0151] Examples of such waveguide or light guide type optical elements include a segmented beam splitter type glass optical element as shown in FIG. 5(a), a sawtooth prism type glass optical element as shown in FIG. 5(b), a diffractive optical element (DOE) type glass optical element as shown in FIG. 5(c), a hologram optical element (HOE) type glass optical element as shown in FIG. 5(d), a passive grating type glass optical element as shown in FIG. 5(e), and an active grating type glass optical element as shown in FIG. 5(f).

[0152] As shown in Figure 5(a), a glass optical element using a segmented beam splitter may have a total reflection mirror 301a on the side where an optical image enters the glass optical element and a segmented beam splitter 301b on the side where the optical image exits.

[0153] Accordingly, the optical image generated by the projection device 200 is totally reflected by the total reflection mirror 301a inside the glass optical element, and the totally reflected optical image is guided along the longitudinal direction of the glass, and is partially separated and emitted by the partial reflection mirror 301b, so that it can be perceived by the user's vision.

[0154] In the sawtooth prism type glass optical member shown in FIG. 5(b), image light from the projection device 200 is incident on the side of the glass in a diagonal direction, is totally reflected inside the glass, and is emitted to the outside of the glass through the sawtooth-shaped concave and convex portions 302 provided on the side from which the light image is emitted, and can be visually recognized by the user.

[0155] A glass optical member having a diffractive optical element (DOE) as shown in Figure 5(c) may have a first diffractive portion 303a on the surface where an optical image is incident and a second diffractive portion 303b on the surface where the optical image is emitted. The first and second diffractive portions 303a and 303b may be provided by patterning a specific pattern on the surface of the glass or by attaching a separate diffractive film.

[0156] Accordingly, the optical image generated by the projection device 200 is incident through the first diffraction unit 303a, diffracted, totally reflected, guided along the longitudinal direction of the glasses, and emitted through the second diffraction unit 303b, where it can be perceived by the user's eyes.

[0157] A glass optical member having a hologram optical element (HOE) as shown in Figure 5(d) may have an out-coupler (304) inside the glass on the side where the optical image is emitted. Accordingly, an optical image is incident from the projection device 200 in a diagonal direction through the side of the glass, is totally reflected, and is guided along the length of the glass, and is emitted from the out-coupler 304 so that it can be recognized by the user's eyes. Such hologram optical members have slightly different structures and can be subdivided into structures with passive gratings and structures with active gratings.

[0158] A glass optical element having a passive grating as shown in Figure 5(e) may have an in-coupler (305a) on the surface opposite the glass surface where an optical image is incident, and an out-coupler (305b) on the surface opposite the glass surface where the optical image is emitted. Here, the in-coupler 305a and the out-coupler 305b may be provided in the form of a film having a passive grating.

[0159] Accordingly, the optical image incident on the glass surface on the entrance side of the glass is totally reflected by the in-coupler 305a provided on the opposite surface and guided along the longitudinal direction of the glass, and is output through the opposite surface of the glass by the out-coupler 305b, so that it can be recognized visually by the user.

[0160] A glass optical element having an active grating as shown in FIG. 5(f) may have an in-coupler (306a) formed of an active grating inside the glass on the side where the optical image is incident, and an out-coupler (306b) formed of an active grating inside the glass on the side where the optical image is emitted.

[0161] Accordingly, the optical image incident on the glasses is totally reflected by the in-coupler 306a and guided along the longitudinal direction of the glasses, and is emitted outside the glasses by the out-coupler 306b, so that it can be visually recognized by the user.

[0162] As a modified example, a pin mirror type optical member may be used as the display unit.

[0163] 6(a), a surface reflection optical element of the freeform combiner type may be a freeform combiner glass formed with a curved surface overall, in which multiple flat surfaces with different incident angles of optical images are formed on a single piece of glass to perform the function of a combiner. Such freeform combiner glasses 300 may allow optical images to be incident at different angles in different regions and output to the user.

[0164] The flat HOE type surface reflection type optical element as shown in FIG. 6(b) can be provided by coating or patterning a hologram optical element (HOE, 311) on the surface of a flat glass, and an optical image incident on the projection device 200 can pass through the hologram optical element 311, be reflected on the surface of the glass, and pass through the hologram optical element 311 again to be emitted to the user side.

[0165] The freeform HOE type surface reflection type optical element as shown in FIG. 6(c) may be provided by coating or patterning a holographic optical element (HOE, 313) on the surface of a freeform glass, and the operating principle may be the same as that described in FIG. 6(b).

[0166] FIG. 7 is a perspective view of a projector device according to an embodiment, and FIG. 8 is an exploded perspective view of the projector device according to an embodiment.

[0167] 7 and 8, a projector device 200 according to an embodiment may include an outer lens LS, a barrel 210, a housing 220, a light source unit 230, a light guide LG, a lens FL, and an additional housing 240. The projector device 200 may also include a first spacer SP1 and a second spacer SP2.

[0168] First, the outer lens LS can be inserted into the barrel 210. That is, the barrel 210 is located inside the projector apparatus 200 and can accommodate the outer lens LS. The barrel 210 can also accommodate the light guide LG, the lens LF, the first spacer PS1, and the second spacer SP2.

[0169] The barrel 210 may have spaces for accommodating the aforementioned components or additional optical elements. For example, the barrel 210 may include a first groove and a second groove, which will be described later. The outer lens LS may be disposed in the first groove, and the light guide LG may be disposed in the second groove. The first groove and the second groove may be spaced apart in the barrel 210. That is, the barrel 210 has spaces (e.g., grooves) in which the outer lens LS and the light guide LG are disposed, and these spaces may be separated or spaced apart from each other. This may facilitate the insertion or coupling of the outer lens and the light guide.

[0170] Alternatively, if the spaces are connected to each other, the projector can be made smaller.

[0171] An outer lens LS is accommodated in the barrel 210, and a first spacer SP1 may be positioned outside the outer lens LS. The first spacer SP1 is disposed outside the outer lens LS accommodated in the first groove of the barrel 210, and can prevent the outer lens LS from falling off.

[0172] The barrel 210 may include a plurality of holes connected to the second grooves. The plurality of holes may be located on the side of the barrel 210. Thus, light emitted from the light source unit 230 (described later) may be incident on the light guide LG. The light incident on the light guide LG may then be reflected and passed through or transmitted by the outer lens LS to be provided to the waveguide or wave guide. To this end, the first groove and the second groove may be connected by a through-hole. That is, light reflected by the light guide LG in the second groove may be provided to the outer lens LS of the first groove through the through-hole. Furthermore, as described above, light from the light source unit 230 may be output to the inner light guide LG through a plurality of holes located on the side of the barrel 210.

[0173] A light guide LG may be located within the barrel 210. The light guide LG may be coupled to a lens FL, which will be described below.

[0174] The light guide LG may be composed of at least one prism. For example, the light guide LG may be composed of a combination or splice of a plurality of prisms. The light guide LG may include a prism. The prism is a reflective member, and may include, for example, an X-prism. As an example, the light guide LG may have a structure in which at least two prisms are combined. The light guide LG may also be a non-polarizing prism. That is, the light guide LG may not polarize the light emitted from the light sources 232a, 232b, and 232c.

[0175] The light guide LG may include at least two coating surfaces (reflective members or reflective sheets). One of the at least two coating surfaces may reflect light of a first wavelength and light of a second wavelength, and transmit light of a third wavelength. That is, the coating surface may reflect light of a predetermined wavelength band. As a result, light of a desired wavelength band may be reflected by the light guide LG for each of the lights emitted from the light sources 232a, 232b, and 232c. For example, light passing through the light guide LG may be provided to the outer lens LS.

[0176] The lens FL can be coupled to the light guide LG. The lens FL can be disposed adjacent to the light guide LG. For example, the lens FL can be in contact with the light guide. That is, the lens FL can be in contact with the light guide LG. Also, the light guide LG can be in contact with the lens FL.

[0177] The lens FL may be coupled to the light guide LG. In this case, the lens FL may be coupled to the light guide LG through a joining member or a coupling member. The joining member or the coupling member may be located between the lens FL and the light guide LG.

[0178] The lens FL is located on the outer surface of the light guide LG and may be at least one. For example, the number of lenses FL may correspond to the number of light sources of the light source unit 230 (described later). If the number of light sources is three, the number of lenses FL may also be three.

[0179] For example, the lens FL may include a first lens, a second lens, and a third lens corresponding to the light sources. The first lens may correspond to the first light source unit. The second lens may correspond to the second light source unit. The third lens may correspond to the third light source unit. That is, the first lens to the third lens may receive light emitted from the first light source unit to the third light source unit, respectively.

[0180] The second spacer SP2 may be located inside the barrel 210. For example, the second spacer SP2 may be larger than the light guide LG or the lens FL. The second spacer SP2 may be disposed outside the light guide LG and the lens FL. This prevents the light guide LG and the lens FL from detaching from the barrel 210. In other words, the second spacer SP2 can prevent the light guide LG and the lens FL from being separated from the barrel 210.

[0181] The housing 220 may be located outside the barrel 210. The housing 220 may surround the barrel 210. For example, the housing 220 may be disposed so as to surround at least a region of the barrel 210. The housing 220 may include a space for accommodating a light source. The housing 220 may also include at least one housing hole. The light source may be disposed in the housing hole. Light emitted from the light source may be provided to the lens FL and the light guide LG through the at least one housing hole. The housing 220 may be disposed outside the barrel 210 and may include a space for accommodating the barrel 210 and the light source unit 230.

[0182] There may be at least one light source unit 230. As described above, the following description will be based on three light source units. The light source unit 230 may include a first light source unit 230a, a second light source unit 230b, and a third light source unit 230c.

[0183] The first light source unit 230a may overlap with the outer lens LS in a second direction (Y-axis direction). The second direction (Y-axis direction) may correspond to the direction of light emitted from the projection device 200. That is, the second direction (Y-axis direction) may correspond to the direction in which light emitted from the light source unit 230 is reflected by the light guide LG and emitted to the display unit.

[0184] The second light source unit 230b and the third light source unit 230c may be positioned to face each other, or the second light source unit 230b and the third light source unit 230c may be positioned to face each other.

[0185] The second light source unit 230b and the third light source unit 230c may overlap in a first direction (X-axis direction). The first direction (X-axis direction) may be perpendicular to the second direction (Y-axis direction). The third direction (Z-axis direction) may be perpendicular to the first and second directions.

[0186] The first light source unit 230a may be located in a region between the second light source unit 230b and the third light source unit 230c, and the directions of the light emitted from the second light source unit 230b and the third light source unit 230c may be opposite to each other.

[0187] Each light source unit may include a substrate 231a, 231b, or 231c, a light source 232a, 232b, or 232c, and an optical member 233a, 233b, or 233c.

[0188] Furthermore, the substrates 231a, 231b, 231c, the light sources 232a, 232b, 232c, and the optical members 233a, 233b, 233c may be positioned sequentially inward, i.e., the optical members may be positioned adjacent to the substrates and light sources versus the light guide LG.

[0189] The substrates 231a, 231b, and 231c are connected to the light sources 232a, 232b, and 232c and can transmit electrical energy to the light sources 232a, 232b, and 232c so that the light sources 232a, 232b, and 232c can emit light.

[0190] The substrates 231 a , 231 b , and 231 c can be located on the outermost side of the housing 220 .

[0191] The substrates 231a, 231b, and 231c may include a first substrate 231a, a second substrate 231b, and a third substrate 231c. The first substrate 231a may overlap the light guide LG in the second direction (Y-axis direction). The second substrate 231b and the third substrate 231c may overlap in the first direction (X-axis direction). The second substrate 231b and the third substrate 231c may be positioned to face each other in the housing 220. The first substrate 231a may be positioned in the region between the second substrate 231b and the third substrate 231c.

[0192] The light sources 232a, 232b, and 232c may emit light. For example, the light emitted from the light sources 232a, 232b, and 232c may enter a light guide LG in the housing 220. The light guide LG may be located within the housing 220.

[0193] The light sources 232a, 232b, and 232c may be one or more, and may include a first light source 232a, a second light source 232b, and a third light source 232c. The light sources 232a, 232b, and 232c may be disposed on each substrate.

[0194] That is, the light source device 230 may include a single light source 232a, 232b, and 232c or multiple light sources. For example, the light sources 232a, 232b, and 232c may be multiple and include a first light source 232a, a second light source 232b, and a third light source 232c. The first light source 232a to the third light source 232c may emit light in the same direction or in different directions. For example, the second light source 232b and the third light source 232c may be positioned opposite each other. The second light source 232b and the third light source 232c may be positioned to overlap in the first direction (X-axis direction). In addition, a light guide LG may be positioned between the second light source 232b and the third light source 232c. As a result, the light guide LG may overlap the second light source 232b and the third light source 232c.

[0195] The first light source 232a to the third light source 232c can emit light toward the light guide LG. The first light source 232a can overlap with the light guide LG in the second direction. With this configuration, the projector 200 can have a compact light source device 230.

[0196] In addition, the first light source 232a, the second light source 232b, and the third light source 232c may emit light of wavelengths or colors that are partially the same or different from each other. For example, the first light source 232a, the second light source 232b, and the third light source 232c may emit red, green, and blue light, respectively.

[0197] There may be at least one optical member 233a, 233b, or 233c. The optical members 233a, 233b, and 233c may include a first optical member 233a, a second optical member 233b, and a third optical member 233c corresponding to the first light source 232a, the second light source 232b, and the third light source 232c, respectively. The first optical member 233a, the second optical member 233b, and the third optical member 233c may include a filter. The first optical member 233a, the second optical member 233b, and the third optical member 233c may also include glass. The first optical member 233a, the second optical member 233b, and the third optical member 233c may filter light. Alternatively, the first optical member 233a, the second optical member 233b, and the third optical member 233c may quickly block foreign matter from entering the light source, thereby protecting the light source.

[0198] The additional housing 240 may be disposed outside the barrel 210 to surround the barrel 210. The barrel 210 may be coupled to the housing 220 using various coupling methods, and the additional housing 240 may be coupled to the housing 220. The additional housing 240 may also be coupled to the barrel 210. Accordingly, the projector device 200 according to the embodiment may provide improved reliability.

[0199] FIG. 9 is a diagram illustrating the connection of an outer lens, a first spacer, a light guide, a lens, and a second spacer as a barrel in a projector device according to one embodiment; FIG. 10 is a diagram illustrating the connection between a barrel, a housing, and an additional housing in a projector device according to one embodiment; and FIG. 11 is a diagram illustrating the connection between a housing and a light source unit in a projector device according to one embodiment.

[0200] 9 to 11, in the projector device according to the embodiment, the barrel 210 may include the first groove 210h1 and the second groove 210h2 as described above. The first groove 210h1 and the second groove 210h2 may overlap in the second direction (Y-axis direction). Furthermore, the second groove 210h2 and the first groove 210h1 may be sequentially arranged along the second direction (Y-axis direction).

[0201] An outer lens may be disposed in the first groove 210h1, and a light guide may be disposed in the second groove 210h2.

[0202] The first groove 210h1 and the second groove 210h2 may be spaced apart in the second direction (Y-axis direction). The first groove 210h1 and the second groove 210h2 may be connected to each other through the through-hole as described above. This allows light reflected by the light guide in the second groove 210h2 to be provided to the outer lens in the first groove 210h1 and finally emitted to the display unit.

[0203] An outer lens LS may be inserted into the first groove 210h1 of the barrel 210. A first spacer SP1 may be positioned outside the outer lens LS in the first groove 210h1 of the barrel 210. The first spacer SP1 contacts the outer lens LS and can prevent the outer lens LS from being separated, as described above.

[0204] The light guide LG and the lenses FL1, FL2, and FL3 connected to the light guide LG can be inserted into the second groove 210h2. The light guide LG and the lenses FL1, FL2, and FL3 connected to the light guide LG can be positioned within the second groove 210h2. A second spacer SP2 can be positioned outside the light guide LG and the lenses FL1, FL2, and FL3 connected to the light guide LG. The second spacer SP2 can contact the light guide LG or the lenses (especially the first guide lens FL1). This can prevent the light guide LG and the lenses FL1, FL2, and FL3 connected to the light guide LG from coming off.

[0205] The first spacer SP1 and the second spacer SP2 may be sequentially arranged along the second direction (Y-axis direction). The first spacer SP1 and the second spacer SP2 may overlap along the second direction (Y-axis direction). The outer lens LS, the light guide LG, and the first guide lens FL1 may be positioned between the first spacer SP1 and the second spacer SP2. Thus, the first spacer SP1 and the second spacer SP2 may overlap with the outer lens LS, the light guide LG, and the first guide lens FL1 in the second direction (Y-axis direction).

[0206] The barrel 210 may be inserted into the housing 220. That is, the barrel 210 may be positioned in a receiving hole of the housing 220. The housing 220 and the barrel 210 may be coupled to each other in various coupling methods. For example, a protrusion of the housing 220 may be coupled to a coupling hole of the barrel 210. The housing 220 may be positioned below the barrel 210, and the additional housing 240 may be positioned above the barrel 210. The additional housing 240 may allow the barrel 210 to maintain an improved coupling force with the housing 220.

[0207] After the barrel 210 is accommodated in the housing 220, a plurality of light sources may be inserted into the side of the housing 220. For example, a first light source 230a, a second light source 230b, and a third light source 230c may be positioned on the side of the housing 220.

[0208] Figure 12 is a diagram of the optical system of the projector device of the first embodiment, Figure 13 is a perspective view of the light guide, fourth lens and side lens in the projector device of the embodiment, and Figure 14 is another perspective view of the light guide, fourth lens and side lens in the projector device of the embodiment.

[0209] 12 to 14, the optical system in the projection device according to the first embodiment may include an outer lens LS, a light guide LG, an optical member (not shown), and a lens FL. The optical system in the projection device may further include light sources 232a, 232b, and 232c. The optical system in the projection device may also include an aperture ST. The outer lens LS may be used interchangeably with "lens group" or "at least one lens." In the projection device, the direction from the light guide LG toward the lens group LS, aperture ST, or light guide WG may be referred to as the object direction (or object side), projection side, or target side. The target side corresponds to the direction from each light source toward the waveguide WG based on the light travel path. The direction from the light guide LG toward each light source may be referred to as the source side, upward direction, or light source side. In other words, the light source side may be the direction toward light from the light guide LG. Although the direction in the drawing is toward the first light source, the light source side may correspond to the direction toward the light source adjacent to the corresponding component for the first to third lenses and the first to third optical members. For example, the light source side for the second lens or the second optical member corresponds to the direction toward the second light source 232b.

[0210] Specifically, the lens group LS may include N lenses, and the N lenses may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in order of their proximity to the waveguide WG.

[0211] The light guide LG may have a hexahedral shape. Accordingly, the light guide LG may include a first side or first lateral surface LGS1 facing the first light source 232a. The light guide LG may include a second side or second lateral surface LGS2 facing the second light source 232b. The light guide LG may include a third side or third lateral surface LGS3 facing the third light source 232c. The light guide LG may include a fourth side or fourth lateral surface LGS4 facing the fourth lens L4 or the nth lens Ln. Furthermore, the first side to the fourth side may refer to directions other than sides. For example, the first light source 232a may be located on the first side of the light guide LG.

[0212] Furthermore, the lenses FL1 to FL3 may include a first lens FL1, a second lens FL2, and a third lens FL3. The first guide lens may correspond to the first lens FL1. Furthermore, the first lens may be used interchangeably with "lens" or "guide lens."

[0213] The first side LGS1 and the fourth side LGS4 of the light guide LG may be opposite or facing each other, and the second side LGS2 and the third side LGS3 of the light guide LG2 may be opposite or facing each other.

[0214] In the light guide LG, a first optical axis OP1 for the first side LGS1 and the fourth side LGS4 may be perpendicular to a second optical axis OP2 for the second side LG2 and the third side LG3. The first optical axis OP1 corresponds to the axis of light emitted from the first light source 232a and may be aligned with the second direction (Y-axis direction). The second optical axis OP1 may be aligned with the first direction (X-axis direction). With this configuration, the perpendicularity between the optical axes may allow the mounting structure of the first light source 232a to the third light source 232c in the projection device according to the embodiment to be miniaturized and the process to be minimized.

[0215] The lens group LS may include three or four lenses. As shown in FIG. 17, the outer lens LS may include three lenses, consisting of a first lens L1 to a third lens L3. In this case, the Nth lens corresponds to the third lens L3. However, as shown in the drawing, the outer lens or lens group LS may include four lenses, consisting of a first lens L1 to a fourth lens L4. In this case, the Nth lens Ln corresponds to the fourth lens L4.

[0216] The first lens L1 may be positioned furthest from the fourth side LGS4 of the light guide LG, and the Nth or fourth lens (L4 or Ln) may be positioned closest to the fourth side LGS4 of the light guide LG.

[0217] The first side LGS1 and the fourth side LGS4 of the light guide LG may overlap along the optical axis direction or the second direction.

[0218] As an example, the Nth or fourth lens L4 may be coupled to the light guide LG. In particular, the fourth lens L4 may contact or abut a fourth side or lateral surface LGS4 of the light guide LG.

[0219] The lenses FL may be disposed on the light guide LG. For example, the lenses FL may be in contact with the light guide LG. The number of lenses FL may correspond to the number of light sources. For example, if there are three light sources, the number of lenses FL may be three. Also, if there is one light source, the number of lenses FL may be one.

[0220] The lens FL may be referred to as the "light source lens" or "side lens" hereinafter. The lens FL may include a first side lens FL1, a second side lens FL2, and a third side lens FL3. The first side lens FL1 may be located between the second side lens FL2 and the third side lens FL3. However, the first side lens FL1 may not overlap the second side lens FL2 and the third side lens FL3 in the second direction (Y-axis direction). The first side lens FL1 may be positioned offset from the second side lens FL2 and the third side lens FL3 in the first direction (X-axis direction). Furthermore, the first side lens FL1 may overlap the light guide LG in the second direction (Y-axis direction). For example, the first side lens FL1 may overlap the light guide LG in the light emission direction of the first light source 232a.

[0221] In addition, optical elements may be disposed between the light source and the light guide LG. For example, the optical elements may include a first optical element, a second optical element, and a third optical element. And the light source may include a first light source 232a, a second light source 232b, and a third light source 232c.

[0222] The first optical member may be disposed between the first light source 232a and the first lens FL1, the second optical member may be disposed between the second light source 232b and the second lens FL2, and the third optical member may be disposed between the second light source 232c and the third lens FL3.

[0223] The first optical member may be disposed between the second optical member and the third optical member. The first optical member may not overlap the second optical member and the third optical member in the second direction (Y-axis direction). The first optical member may be disposed offset from the second optical member and the third optical member in the second direction.

[0224] As a result, light emitted from the first light source 232a can be provided to the waveguide WG through the first optical member, the first lens FL1, the light guide LG, and the outer lens LS. Light emitted from the second light source 232b can be provided to the waveguide WG through the second optical member, the second lens FL2, the light guide LG, and the outer lens LS. Light emitted from the third light source 232c can be provided to the waveguide WG through the third optical member, the third lens FL3, the light guide LG, and the outer lens LS.

[0225] The first lens L1 may have a first surface S11 or a first target surface S11, which is the surface on the waveguide WG side (or the target side or object side). The first lens L1 may also have a second surface S12 or a second target surface S22, which is the surface on the light guide LG side (or the light side, light source side, or upper side). The second lens L2 may have a third surface S31 or a third target surface S21, which is the surface on the waveguide WG side. The second lens L2 may have a fourth surface S22 or a fourth target surface S22, which is the surface on the light guide LG side. The third lens L3 may have a fifth surface S31 or a fifth target surface S31, which is the surface on the waveguide WG side. The third lens L3 may have a sixth surface S32 or a sixth target surface S32, which is the surface on the light guide LG side. The fourth lens L4 may have a seventh surface S41 or a fourth target surface S41, which is the surface on the waveguide WG side. The fourth lens L4 may include an eighth surface S42 or an eighth target surface S42, which is the surface facing the light guide LG. The fourth surface S42 may contact the fourth side LGS4 of the light guide LG. This may prevent total reflection from occurring on the side surfaces (first side to fourth side) of the light guide. For example, total reflection may be suppressed on the fourth side surface LGS4 of the light guide LG, thereby eliminating stray light.

[0226] In addition, light from multiple light sources may be reflected by the light guide and irradiated toward the diaphragm ST or the waveguide WG through the outer lens LS. Although the drawings show light emitted from the first light source 232a being provided to the waveguide through the light guide LG, as described above, it should be understood that light emitted from other light sources (second and third light sources) is also reflected by the light guide LG and irradiated toward the waveguide, etc.

[0227] The following various embodiments of the present invention will be described based on the above content, and the content described below may be applied equally to other embodiments except for content that contradicts the content described in the other embodiments.

[0228] In the optical system of the projection device according to the first embodiment, the first light source 232a may be disposed on the first side or upper side of the light guide LG. The lens group LS may be disposed on the fourth side or object side (or projection side / target side) of the light guide LG. Furthermore, the first-side lens FL1 may be located between the first side LGS1 of the light guide LG and the first light source 232a. As an example, the first side LGS1 of the light guide LG may overlap with the fourth side LGS4 of the light guide LG in the optical axis direction or the second direction (Y-axis direction) of the outer lens LS. In other words, the first side LGS1 and the fourth side LGS4 of the light guide LG may overlap and face each other in the second direction.

[0229] In this embodiment, the first lens FL1 may be in contact with the light guide LG. For example, the first lens FL1 may be bonded to the first side LGS1 of the light guide LG by a bonding member or may be integral with the first side LGS1.

[0230] As described above, the lens group LS may include the first lens L1 through the Nth lens Ln. For example, the first lens L1 of the lens group LS may be disposed farthest from the fourth side LGS4 of the light guide LG. The fourth lens L4 may be disposed closest to the fourth side LGS4 of the light guide LG. In other words, the length in the second direction (Y-axis direction) between the fourth side LGS4 and the first lens L1 may be greater than the length d4 in the second direction (Y-axis direction) between the fourth side LGS4 and the fourth lens L4. In this case, since the fourth lens L4 is in contact with the fourth side LGS4, d4 may be zero.

[0231] Furthermore, the third lens L3 and the second lens L2 may be disposed between the first lens L1 and the fourth lens L4 in the second direction.

[0232] As an example, the first lens L1 may be convex on the surface opposite to the surface facing the fourth side LGS4 of the light guide LG. That is, the first lens L1 may be convex toward the second direction (Y-axis direction). Conversely, the first lens L1 may be concave in the direction opposite to the second direction. In other words, the first surface S11 of the first lens L1 may be concave toward the fourth side LGS4. The first lens L1 may be convex toward the waveguide WG. Accordingly, the light or light collected by the light guide LG can be easily guided to the light guide plate or waveguide WG. In other words, the collected light can be efficiently diffused.

[0233] For example, a second lens FL2 may be located between the second side LGS2 of the light guide LG and the second light source 232b, and a third lens FL3 may be located between the third side LGS3 of the light guide LG and the third light source 232c.

[0234] The first lens FL1 may include a surface FL12 adjacent to the first light source 232a or an upper surface FL12. The upper surface FL12 of the first lens FL1 may be convex toward the first light source 232a or upward.

[0235] The second lens FL2 may include a surface F22 adjacent to the second light source 232b or an upper surface. The upper surface FL22 of the second lens FL2 may be convex toward the second light source 232b or upward.

[0236] The third lens FL3 may include a surface F32 adjacent to the third light source 232c or an upper surface. The upper surface FL32 of the third lens FL3 may be convex toward the third light source 232c or upward.

[0237] In other words, the surface FL12 of the first side lens FL1 adjacent to the first light source 232a may bulge toward the first light source 232a, the surface FL22 of the second side lens FL2 adjacent to the second light source 232b may bulge toward the second light source 232b, and the surface FL32 of the third side lens FL3 adjacent to the third light source 232c may bulge toward the third light source 232c.

[0238] The first, second, and third lenses FL1, FL2, and FL3 may have surfaces FL12, FL22, and FL32 adjacent to the light sources 232a, 232b, and 232c that have the same radius of curvature. The radii of curvature of the surfaces FL12, FL22, and FL32 may be negative (-).

[0239] This configuration minimizes the total track length (TTL) and facilitates yield. The total track length (TTL) may correspond to the distance along the optical axis from the first surface S11 of the first lens L1 to the light sources 232a, 232b, and 232c. Alternatively, the TTL may correspond to the distance along the optical axis from the first surface S11 of the first lens L1 to the light sources. For example, the TTL may correspond to the distance along the optical axis from the first lens L1 to the first light source 232a. The distance along the optical axis from the first lens L1 to the first light source 232a, or the TTL, may be less than twice the focal length of the optical system including the lens group Ls, the light guide LG, and the side lenses FL1, FL2, and FL3. This configuration facilitates reducing the size of the projector or optical system.

[0240] According to an embodiment, the focal length of the optical system (or lens group Ls, light guide LG and side lenses FL1, FL2, FL3) may be 4 mm to 10 mm. The maximum distance or TTL from the first lens L1 to the first light source 232a may be 8 mm to 20 mm.

[0241] In addition, the surface of the first lens L1 facing the light guide LG or the second surface S12 may be convex in the direction opposite to the direction toward the light guide LG. That is, the second surface S12 may be convex toward the object side, the target side, or the projection side. This configuration minimizes TTL and easily ensures the brightness of the light provided to the waveguide WG.

[0242] The size of the light guide LG may be larger than the size of the light sources. For example, the area S1 of each side of the light guide LG may be larger than the area of ​​each of the light sources 232a to 232c. For example, the area of ​​each surface of the light guide LG facing each of the light sources 232a to 232c may be larger than the area of ​​each of the light sources 232a to 232c facing the light guide LG. For example, the area of ​​the first side surface LGS1 of the light guide LG is larger than the area of ​​the first light source 232a. The area of ​​the second side surface LGS2 of the light guide is larger than the area of ​​the second light source 232b. The area of ​​the third side surface LGS3 of the light guide is larger than the area of ​​the third light source 232c. For example, the minimum length in one direction of the light guide LG may be larger than the minimum length in one direction of the light sources. For example, the minimum length in one direction of the first side surface LGS1 of the light guide is longer than the minimum length in one direction of the first light source 232a. The minimum length in one direction of the second side surface LGS2 of the light guide is longer than the minimum length in one direction of the second light source 232b. The minimum length in one direction of the third side surface LGS3 of the light guide is longer than the minimum length in one direction of the third light source 232c, which can improve the efficiency of the light source and suppress the occurrence of flare.

[0243] The size or area S1 of each side of the light guide LG may be larger than the size S2 of each adjacent lens. For example, the size S2 of the first-side lens FL1 may be smaller than the size S1 of the first side LGS1 of the light guide. For example, the size or effective diameter of the surface FL11 of the first-side lens FL1 adjacent to the light guide is smaller than the size of the first side LGS1 of the light guide. The size or effective diameter of the surface FL21 of the second-side lens FL2 adjacent to the light guide is smaller than the size of the second side LGS2 of the light guide. The size or effective diameter of the surface FL31 of the third-side lens FL3 adjacent to the light guide is smaller than the size of the third side LGS3 of the light guide. For example, the minimum length in one direction of the light guide LG is larger than the minimum length in one direction of the first to third-side lenses. For example, the minimum length in one direction of the first side LGS1 of the light guide is longer than the minimum length or diameter in one direction of the surface FL11 of the first-side lens FL1 adjacent to the light guide. The minimum length in one direction of the second side surface LGS2 of the light guide is longer than the minimum length in one direction or the diameter length of the surface FL12 of the second side lens FL2 adjacent to the light guide. The minimum length in one direction of the third side surface LGS3 of the light guide is longer than the minimum length in one direction or the diameter length of the surface FL13 of the third side lens FL3 adjacent to the light guide. This configuration eliminates interference between the side lens FL and the light guide LG, ensuring ease of manufacturing the side lenses.

[0244] In addition, the size or effective diameter of the light guide LG may be larger than the size or effective diameter of at least one of the first to Nth lenses (Ln or the fourth lens) of the lens group Ls. This configuration ensures a reduction in TTL and allows for a more compact project.

[0245] Furthermore, the size S4 of the Nth or fourth lens L4 may be different from the size S3 of the fourth side LGS4 of the light guide LG. For example, the size S4 of the Nth or fourth lens L4 may be smaller than the size S3 of the fourth side LGS4 of the light guide LG. This allows for the aforementioned miniaturization.

[0246] Alternatively, the size S4 of the Nth or fourth lens L4 may be smaller than the size S3 of the fourth side LGS4 of the light guide LG, or a portion of the fourth lens L4 may be offset in the second direction (Y-axis direction) from the fourth side LGS4 of the light guide LG.

[0247] Furthermore, the object-side surface F11 of the first-side lens FL1 can be in contact with the first-side side LGS1 of the light guide LG. The object-side surface F21 of the second-side lens FL2 can be in contact with the second-side side LGS2 of the light guide LG. The object-side surface F31 of the third-side lens FL3 can be in contact with the third-side side LGS3 of the light guide LG. Furthermore, the upper surface or eighth surface S42 of the Nth or fourth lens L4 can be in contact with the fourth-side side LGS4 of the light guide LG.

[0248] The seventh surface S43 of the fourth lens L4 may be recessed toward the light guide LG or may bulge toward the object side.

[0249] The fifth surface S31 may be recessed in the second direction, or the fifth surface S31 may be convex towards the light guide LG. The sixth surface S32 may be recessed in the second direction or towards the waveguide, or the sixth surface S32 may be recessed (or convex) towards the second direction or towards the waveguide, or the sixth surface S32 may be convex (or recessed) towards the light guide LG.

[0250] The third surface S21 may be convex in the second direction or towards the waveguide, or the third surface S3 may be concave towards the light guide LG, and the fourth surface S22 may be convex or concave in the second direction or towards the waveguide, or the fourth surface S22 may be concave or convex towards the light guide LG.

[0251] The first surface S11 may be convex toward the waveguide or the first direction as described above, and the second surface S12 may be concave or convex toward the light guide LG, or the second surface S12 may be concave in the first direction or toward the waveguide.

[0252] Furthermore, as an example, the refractive power or power of the first lens L1 may be positive. The composite power of the lenses disposed between the first lens L1 and the Nth lens Ln may be positive or negative. That is, the composite power of the second lens L2 and the third lens L3 may be positive or negative.

[0253] The second lens L2 can have positive refractive power, the third lens can have negative refractive power, the fourth lens can have positive or negative refractive power, and the side lenses FL1 to FL3 can have positive refractive power.

[0254] The second side LGS2 of the light guide LG may be disposed opposite to the third side LGS3 of the light guide LG across the light guide LG, whereby the second-side lens FL2 and the third-side lens FL3 may be disposed opposite to or symmetrical with respect to the light guide LG.

[0255] As mentioned above, each lens can be in contact with the light guide LG. For example, the first lens FL1 can be in contact with or adjacent to the light guide LG, the second lens FL2 can be in contact with or adjacent to the light guide LG, and the third lens FL3 can be in contact with or adjacent to the light guide LG.

[0256] The optical axis of each lens may have a radius of curvature of 100 mm or more at the surface FL11, FL21, or FL31 adjacent to or in contact with the light guide LG. The optical axis may correspond to the central axis of the light emitted from each light source to the light guide.

[0257] The radius of curvature of the seventh surface S41 of the Nth lens or the fourth lens L4 may be positive or negative. For example, the seventh surface S41 may be convex or concave in the second direction or toward the object side, as described above.

[0258] This configuration allows the field of view (FOV) of the light provided by the projector or optical system to be kept at an included angle of 45 degrees or less.

[0259] As described above, each side lens can be coupled to the light guide LG by a contact member or a bonding member. The bonding member can be made of a transparent material and have a refractive index similar to that of the light guide LG or the side lenses. That is, the bonding member can be positioned between the light guide LG and one of the first side lens FL1 to the third side lens FL3. The bonding member can also be positioned between the light guide LG and the fourth lens L4.

[0260] As described above, the side of the light guide LG may be the same size or longer than the surface adjacent to the light guide LG of each lens. In this case, even if the side of the light guide LG is different in size from the interface surfaces FL11, FL21, and FL31 of the light guide and each lens, the length in one direction (first, second, or third direction) is equal to or longer than the interface surfaces FL11, FL21, and FL31 of the light guide and each lens. For example, the length of the side of the light guide LG in one direction (first, second, or third direction) is longer than the length of the side lenses (first lens to third lens) in one direction (first, second, or third direction). For example, the length of the side of the light guide LG in two directions may be longer than the length of the two directions of the interface surfaces of each side. Also, the length of the side of the light guide LG in one direction is longer than the length of the interface surfaces of the lenses.

[0261] Alternatively, the length of the side surface of the light guide LG in one direction (first direction, second direction, or third direction) may be smaller than the length of the side lenses (first side lens to third side lens) in one direction (first direction, second direction, or third direction). For example, the length of the side surface of the light guide LG in two directions may be greater than the length of two directions of the junctions of each side surface, and the length of the side surface of the light guide LG in the remaining direction may be smaller than the length of one direction of the junction surfaces of the lenses.

[0262] In addition, as an example, the surface adjacent to the light guide LG or the bonding surface F11, F21, F31, and S42 of each side surface may be flat. For example, the surface adjacent to the light guide LG or the bonding surface F11 of the first-side lens FL1 may be flat, and the surface perpendicular to the first direction may be flat.

[0263] Furthermore, the "semi-aperture" can be the radius of the effective diameter or the radius of the beam area.

[0264] As described above, the waveguide WG may be disposed to face the first lens L1. That is, the waveguide WG may be positioned adjacent to the first lens L1. The diaphragm ST may be positioned in a direction from the first lens L1 toward the waveguide. The diaphragm ST may be positioned adjacent to the first lens L1. The diaphragm ST may be positioned corresponding to the contact point between the projector device and the waveguide WG.

[0265] In addition, as an embodiment, at least one of the N lenses may have a surface (object side surface) opposite to the surface facing the light guide LG that is concave toward the light guide LG.

[0266] The length of the N lenses in the second direction (Y-axis direction) may be smaller than the length of the light guide LG in the second direction.

[0267] Furthermore, the contents of Table 1 below can be applied to each component of the optical system according to the embodiment.

[0268] [Table 1] TIFF2025530096000003.tif131162

[0269] Here, the left column of each lens shows the surface facing the waveguide, and the right column shows the surface facing the light source. For each lens, the left column shows the surface facing the light guide F11, F21, and F31, and the right column shows the surface facing the light source F12, F22, and F32. The thickness of each lens corresponds to the left column. The spacing between adjacent lenses corresponds to the right column. The right column of thickness indicates the spacing between adjacent elements in the direction toward the light source. For example, the first surface of the first lens is shown in the left column. The second surface of the first lens is shown in the right column. Furthermore, the unit of length, such as thickness, may be in millimeters. Figure 15 is a diagram of the optical system of a projection device according to a second embodiment.

[0270] 15, the projection device according to the second embodiment may include the optical system as described above. In particular, the optical system in this embodiment may include the aperture ST, outer lens LS, light guide LG, side lens FL1, optical member 233a, and light source 232a as described in the first embodiment. The same applies to the above except for the following.

[0271] However, in this embodiment, there is one light source, and the optical system may include a first light source 232a. The optical system may also include a first optical member 233b and a first lens FL1. Therefore, the above descriptions of the second optical member, third optical member, second lens, third lens, second light source, and third light source may not apply to this embodiment.

[0272] In addition, as an embodiment, the light source may include only a first light source and may include light sources having various colors or wavelength bands. The first light source may include an RGB light source, for example, an RGB LED. Alternatively, the first light source may include a monochromatic light source (LED) that outputs one of the RGB colors. Alternatively, the first light source may include a light source (LED) that outputs two of the RGB colors.

[0273] The contents of Table 2 below can be applied to each component of the optical system according to this embodiment.

[0274] [Table 2] TIFF2025530096000005.tif224162

[0275] Here, the left column of each lens discloses the surface facing the waveguide, and the right column discloses the surface facing the light source. For each lens, the left column discloses the surface facing the light guide F11, F21, and F31, and the right column discloses the surface facing the light source F12, F22, and F32. The thickness of each lens corresponds to the left column. The spacing between adjacent lenses corresponds to the right column. For example, the first surface of the first lens is disclosed in the left column. The second surface of the first lens is disclosed in the right column. For the light guide (lens, optical element), the left column discloses the surface facing the waveguide. For the light guide (lens, optical element), the right column discloses the surface facing each light source (e.g., the second light source for the second lens). Furthermore, in relation to the thickness of the light guide (side lens, optical member), the left column indicates the thickness of the corresponding component (length along the first direction or optical axis), and the right column indicates the distance in the first direction between the corresponding component and the component closest to the light source. This explanation can be applied in the same way as the explanation for Table 1.

Claims

1. Light guide; a first light source disposed on a first side of the light guide; a lens group disposed on a fourth side of the light guide; and a first-side lens disposed between the first side of the light guide and the first light source; the lens group includes a first lens to an Nth lens, the first lens is disposed furthest from the fourth side of the light guide; a first side of the light guide overlaps with a fourth side of the light guide in the optical axis direction of the lens group; The first side lens and the Nth lens contact the light guide.

2. The projection apparatus of claim 1 , wherein the Nth lens is positioned closest to the light guide in the lens group.

3. a second light source disposed on a second side of the light guide; a third light source disposed on a third side of the light guide; a second side lens disposed between the second side of the light guide and the second light source; and 10. The projection apparatus of claim 1, further comprising: a third-side lens disposed between the third side of the light guide and the third light source.

4. the first lens has a convex surface adjacent to the first light source, the second lens has a convex surface adjacent to the second light source, the third lens has a bulging surface adjacent to the third light source, The projection device according to claim 3 , wherein the first lens, the second lens, and the third lens have the same radius of curvature on the surfaces adjacent to the respective light sources.

5. The projection device of claim 3 , wherein a first optical axis for the first side and the fourth side of the light guide is perpendicular to a second optical axis for the second side and the third side of the light guide.

6. 2. The projection device according to claim 1, wherein a distance on the optical axis from the first lens to the first light source is equal to or less than twice the focal length of the lens group, the light guide, and the first lens.

7. The projection device according to claim 1 , wherein the surface of the first lens facing the light guide bulges in a direction opposite to the direction facing the light guide.

8. The projector apparatus of claim 1 , wherein the light guide is larger than the light source.

9. The projection device of claim 1 , wherein a size of the first side lens is smaller than a size of the first side of the light guide.

10. 2. The projection device according to claim 1, wherein the size or effective diameter of the light guide is larger than the size or effective diameter of at least one of the first to Nth lenses of the lens group.

Images