Projection device and electronic device including the same

Abstract

Embodiments provide a projection device comprising: a light guide; a first light source disposed at a first side of the light guide; a lens group disposed at a fourth side of the light guide; and a first side lens disposed between a first side of the light guide and the first light source, in which the first side of the light guide overlaps a fourth side of the light guide in an optical axis direction of the lens group, and the first side lens is in contact with the light guide.

Description

Technical Field

[0001] Embodiments relate to a projection device and an electronic device including the projection device. Background Art

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

[0003] Augmented reality (AR) is a technology that synthesizes virtual objects or information into a real environment to appear as objects existing in the original environment.

[0004] Mixed reality (MR) or hybrid reality refers to creating a new environment or new information by combining the virtual world and the real world. In particular, real-time interaction between those existing in the real world and the virtual world is called mixed reality.

[0005] At this time, since the created virtual environment or situation stimulates the user's five senses and allows a space and time experience similar to reality, the user can move freely between reality and imagination. In addition, in addition to simply immersing themselves in the environment, the user can also interact with those realized in the environment by processing or commanding using real devices.

[0006] Recently, research on equipment (gears, devices) used in this technical field is being actively carried out. However, the demand for equipment to be miniaturized and to provide high resolution is emerging. In addition, the demand for equipment to be miniaturized and to provide high resolution is emerging. Summary of the invention

[0007] [Technical issues]

[0008] In using a projection device for augmented reality (AR) or the like and an electronic device including the projection device, embodiments provide a projection device and an electronic device that can be more easily miniaturized by arranging a lens in a light guide and closer than a light source.

[0009] In addition, a projection device and an electronic device with reduced TTL are provided.

[0010] In addition, a more compact projection device and an electronic device with improved optical uniformity are provided.

[0011] In addition, a projection device having improved resolution and an electronic device including the projection device are provided.

[0012] In addition, a projection device having improved reliability and an electronic device including the projection device are provided.

[0013] In addition, a projection device having improved coupling strength and assembling performance and an electronic device including the projection device are provided.

[0014] In addition, a projection device that is easy to inspect and has improved coupling strength and durability, and an electronic device including the projection device are provided.

[0015] The problems to be solved in the embodiments are not limited thereto, and it can be said that purposes or effects that can be grasped from solutions to the problems or embodiments described below are also included.

[0016] [Technical solution]

[0017] According to an embodiment, a projection device includes: a light guide; a first light source arranged at a first side of the light guide; a lens group arranged at 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, wherein 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 contacts the light guide.

[0018] The lens group may include a first lens to an Nth lens, the first lens may be arranged to be farthest from the fourth side of the light guide, a side of the first lens opposite to the side facing the fourth side is convex, the Nth lens may be arranged to be closest to the light guide, a side of the Nth lens facing the fourth side of the light guide is concave, a side of the first side lens adjacent to the first light source may be convex, the optical focal length of the first lens may be positive, the optical focal length of the Nth lens may be negative, and the composite optical focal length of the lenses between the first lens and the Nth lens may be positive or negative.

[0019] The projection device may include: a second light source arranged on the second side of the light guide; a third light source arranged on the third side of the light guide; a second side lens arranged between the second side of the light guide and the second light source; and a third side lens arranged between the third side of the light guide and the third light source, wherein a side of the second side lens adjacent to the second light source may be convex, a side of the third side lens adjacent to the third light source may be convex, and the second side of the light guide may be arranged to face the third side of the light guide, wherein the light guide is interposed between the second side of the light guide and the third side of the light guide.

[0020] The first side lens may be in contact with the light guide, and a radius of curvature of the first side lens on an optical axis on a side adjacent to the light guide may be 100 mm or more.

[0021] The light guide and the first side lens may be in contact with each other by an adhesive.

[0022] A side surface of the light guide may be greater than or equal to a side of the first side lens adjacent to the light guide.

[0023] A side of the first side lens adjacent to the light guide may be a flat surface.

[0024] According to an embodiment, a projection device includes: N lenses and a first light source; a light guide arranged between the N lenses and the first light source; and a first side lens arranged between the light guide and the first light source, wherein, among the N lenses, a side of a first lens arranged farthest from the light guide opposite to a side facing the light guide is convex, and a side of an Nth lens arranged closest to the light guide facing the light guide is concave.

[0025] Among the N lenses, the effective diameter of the first lens may be the largest, among the N lenses, the effective diameter of the Nth lens may be the smallest, and the effective diameter of the lens arranged between the first lens and the Nth lens may be smaller than the effective diameter of the first lens and larger than the effective diameter of the Nth lens.

[0026] The first light source may be an RGB LED or a single-color LED which is one of RGB.

[0027] The projection device may include: a second light source arranged on a second side of the light guide; and a third light source arranged on a third side of the light guide, wherein the second side of the light guide may be arranged to face the third side of the light guide.

[0028] The projection device may include: a second light guide arranged to face the first lens; and an aperture arranged in the second light guide.

[0029] The Nth lens may be in contact with the light guide.

[0030] A side of at least one lens of the N lenses, opposite to the side facing the light guide, is concave toward the light guide.

[0031] The length of the N lenses may be smaller than the length of the light guide.

[0032] In addition, according to an embodiment, a projection device includes: a plurality of lenses; a lens barrel having a plurality of lenses arranged thereon and including an opening portion on a side surface; an optical signal generating unit arranged adjacent to the lens barrel to generate an optical signal including image information; and a light source device coupled to the lens barrel on the side surface of the opening, wherein the light source device includes a light source; and a shell having an opening formed therein to face the opening portion, the lens barrel including a lens barrel protrusion protruding toward the outside, the shell including a shell protrusion protruding toward the outside, and the lens barrel protrusion at least partially penetrating the shell protrusion.

[0033] The housing protrusion may include a protrusion hole, and the barrel protrusion may be arranged inside the protrusion hole.

[0034] The area protruding from the hole may be exposed.

[0035] The light source device may include a light source assembly disposed in the housing, and the light source assembly may include an assembly protrusion disposed inside the protrusion hole.

[0036] The assembly protrusion may face the barrel protrusion.

[0037] The component protrusion may be located in the exposed area of ​​the protruding hole.

[0038] The projection device may include a first light guide arranged in the barrel, and the light source device may include a second light guide arranged in the housing; and a light source for emitting light toward the second light guide.

[0039] The light source device may include a light source assembly surrounding a housing, the housing may include at least one housing hole corresponding to the second light guide, and the light source assembly may include an assembling hole corresponding to the at least one housing hole.

[0040] The assembly holes may be connected to each other.

[0041] The assembly hole may include a first assembly hole; a second assembly hole arranged outside the first assembly hole; and a third assembly hole arranged outside the second assembly hole.

[0042] The first assembly aperture may be adjacent to the second light guide.

[0043] The assembly hole may be larger than the first assembly hole and the second assembly hole.

[0044] The lens barrel may include a first region and a second region adjacent to the optical signal generating unit below the first region.

[0045] The light source device may include a light source assembly surrounding the housing, and the light source assembly may include a step unit formed in a region adjacent to the second region.

[0046] At least a portion of the optical signal generated by the optical signal generating unit may pass through the first light guide or be reflected by the first light guide.

[0047] [Beneficial Effects]

[0048] When using a projection device for augmented reality (AR) or the like and an electronic device including the projection device, embodiments may realize a projection device and an electronic device that can be more easily miniaturized by arranging a lens in a light guide closer to a light source.

[0049] In addition, a projection device and an electronic device with reduced TTL can be realized.

[0050] In addition, more compact projection devices and electronic devices with improved optical uniformity can be achieved.

[0051] In addition, a projection device having improved resolution and an electronic device including the projection device may be realized.

[0052] In addition, a projection device having improved reliability and an electronic device including the projection device may be realized.

[0053] In addition, a projection device having improved coupling strength and assembling performance and an electronic device including the projection device may be realized.

[0054] In addition, a projection device that is easy to inspect and has improved coupling strength and durability, and an electronic device including the projection device can be realized.

[0055] Various beneficial advantages and effects of the present invention are not limited to those described above and will be more easily understood when specific embodiments of the present invention are described. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a conceptual diagram showing an embodiment of an AI device.

[0057] Figure 2 is a block diagram illustrating a configuration of an extended reality electronic device according to an embodiment of the present invention.

[0058] Figure 3 is a perspective view showing an augmented reality electronic device according to a first embodiment of the present invention.

[0059] Figures 4 to 6 1 is a conceptual diagram for explaining various display methods applicable to a display unit according to an embodiment of the present invention.

[0060] Figure 7 is a perspective view showing a projection device according to an embodiment.

[0061] Figure 8 is an exploded perspective view showing a projection device according to an embodiment.

[0062] Fig. 9 is a perspective view showing a lens barrel in a projection device according to an embodiment.

[0063] Fig.10 is a side view showing a lens barrel in the projection device according to the embodiment.

[0064] Fig.11 is a bottom view showing a lens barrel into which a light guide is inserted in the projection device according to the embodiment.

[0065] Fig.12 2 is a view showing a lens barrel in a projection device according to an embodiment, which illustrates a combination of an outer lens, a first spacer, a light guide, a lens, and a second spacer.

[0066] Fig.13 1 and 2 are views illustrating a combination of a lens barrel, a housing, and an additional housing in a projection device according to an embodiment.

[0067] Fig.14 1 is a view illustrating a combination of a housing and a light source unit in a projection device according to an embodiment.

[0068] Fig.15 : is a view showing the optical system of the projection device according to the first embodiment.

[0069] Fig.16 is a view showing an optical system of a projection device according to a second embodiment.

[0070] Fig.17 is a view showing an optical system of a projection device according to a third embodiment.

[0071] Fig.18 is a conceptual diagram showing a projection device according to another embodiment.

[0072] Fig.19 is a perspective view showing a projection device according to another embodiment.

[0073] Fig. 20 is an exploded perspective view showing a projection device according to another embodiment.

[0074] Fig.21 is along Fig.19 A view taken along line AA' in FIG.

[0075] Fig.22a is a side view showing a lens barrel in the projection device according to the embodiment.

[0076] Figure 22b is another side view showing the lens barrel in the projection device according to the embodiment.

[0077] Fig.22c is a cross-sectional view showing a lens barrel in a projection device according to an embodiment.

[0078] Fig.23a is a side view showing a lens barrel and a housing in a projection device according to an embodiment.

[0079] Figure 23b is another side view showing the lens barrel and the housing in the projection device according to the embodiment.

[0080] Fig.23c is a cross-sectional view showing a lens barrel and a housing in a projection device according to an embodiment.

[0081] Fig.24ais a side view showing a lens barrel, a housing, and a light source assembly in a projection device according to an embodiment.

[0082] Figure 24b is another side view showing the lens barrel, the housing, and the light source assembly in the projection device according to the embodiment.

[0083] Fig.24c is a cross-sectional view showing a lens barrel, a housing, and a light source assembly in a projection device according to an embodiment.

[0084] Fig.25 It is shown Fig.21 An enlarged view of part K1 in FIG.

[0085] Fig.26a It is shown Fig.21 Magnified view of section K2.

[0086] Figure 26b yes Fig.26a 's modified example.

[0087] Fig.26c yes Fig.26a Another modified example of .

[0088] Fig.26d yes Fig.26a Yet another modified example of . DETAILED DESCRIPTION

[0089] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0090] However, the technical spirit of the present invention is not limited to some of the embodiments described, but can be implemented in various forms different from each other, and within the scope of the technical spirit of the present invention, one or more of the components can be selectively combined or replaced and used in the embodiments.

[0091] In addition, the terms (including technical terms and scientific terms) used in the embodiments of the present invention may be interpreted as meanings that can be generally understood by those skilled in the art unless explicitly and specifically defined and described, and the meanings of commonly used terms (such as terms defined in dictionaries) may be interpreted in consideration of the contextual meanings of the relevant technology.

[0092] In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

[0093] In this specification, unless otherwise specifically stated in a phrase, a singular form may also include a plural form, and when it is described as "at least one (or one or more) of A, B and C", it may include one or more of all combinations in which A, B and C can be used.

[0094] In addition, when describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0095] These terms are only intended to distinguish one component from another, and are not intended to limit the nature, sequence, or order of the components.

[0096] In addition, when a component is described as being “connected,” “combined” or “linked” to another component, it may include a case where the component is “connected,” “combined” or “linked” through another component arranged between the component and the other component as well as a case where the component is directly “connected,” “combined” or “linked” to another component.

[0097] In addition, when described as being formed or arranged "on the top (above) or the bottom (below)" of each component, "top (above) or bottom (below)" includes the case where one or more other components are formed or arranged between the two components, as well as the case where the two components are in direct contact with each other. In addition, when expressed as "on the top (above) or the bottom (below)", it can include the meaning of the downward direction and the upward direction relative to one component.

[0098] Figure 1 is a conceptual diagram showing an embodiment of an AI device.

[0099] Reference Figure 1 In the AI ​​system, at least one or more of the AI ​​server 16, the robot 11, the autonomous driving vehicle 12, the XR device 13, the smart phone 14, and the home appliance 15 are connected to the cloud network 10. Here, the robot 11, the autonomous driving vehicle 12, the XR device 13, the smart phone 14, or the home appliance 15 to which the AI ​​technology is applied may be referred to as AI devices 11 to 15.

[0100] 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. Here, the cloud network 10 may be configured using a 3G network, a 4G or Long Term Evolution (LTE) network, a 5G network, or the like.

[0101] That is, the devices 11 to 16 constituting the AI ​​system may be connected to each other through the cloud network 10. In particular, the devices 11 to 16 may communicate with each other through the base station, and may also communicate directly with each other without going through the base station.

[0102] The AI ​​server 16 may include a server that performs AI processing and a server that performs operations on big data.

[0103] The AI server 16 can be connected to at least one or more of the robot 11, autonomous vehicle 12, XR device 13, smart phone 14, and home appliance 15, which are AI devices constituting the AI system, through the cloud network 10, and can assist with at least a part of the AI processing of the connected AI devices 11 to 15.

[0104] At this time, the AI server 16 can train an artificial neural network on behalf of the AI devices 11 to 15 according to a machine learning algorithm, and store or transmit the learning model to itself or the AI devices 11 to 15.

[0105] At this time, the AI server 16 can receive input data from the AI devices 11 to 15, infer the result value of the received input data using the learning model, and generate a response or control command based on the inferred result value and transmit the response or control command to the AI devices 11 to 15.

[0106] Alternatively, the AI devices 11 to 15 themselves can infer the result value of the input data using the learning model, and generate a response or control command based on the inferred result value.

[0107] <AI + Robot>

[0108] The robot 11 can be implemented as a guiding robot, a transportation robot, a cleaning robot, a wearable robot, an entertainment robot, a pet robot, an unmanned aerial robot, etc. by applying AI technology.

[0109] The robot 11 can include a robot control module for controlling operations, and the robot control module can refer to a software module or a chip that implements the software module in hardware.

[0110] The robot 11 can use sensor information obtained from various types of sensors to obtain the state information of the robot 11, detect (identify) the surrounding environment and objects, generate map data, determine a movement path and a driving plan, determine a response to user interaction, or determine an operation.

[0111] Here, the robot 11 can use sensor information obtained from at least one or more sensors among lidar (LiDAR), radar, and camera devices to determine a movement path and a driving plan.

[0112] The robot 11 can use a learning model configured by at least one or more artificial neural networks to perform the above operations. For example, the robot 11 can use the learning model to identify the surrounding environment and objects, and use the identified surrounding environment information or object information to determine an operation. Here, the learning model can be learned by the robot 11 itself or by an external device such as the AI server 16.

[0113] At this time, although the robot 11 itself can perform operations by using the learning model to generate results, it can also perform operations by transmitting sensor information to an external device (such as the AI server 16) and receiving the results generated therefrom.

[0114] The robot 11 can use at least one or more of the map data, object information detected from the sensor information, and object information obtained from an external device to determine a movement path and a driving plan, and control the driving unit to drive the robot 11 according to the determined movement path and driving plan.

[0115] The map data may include object recognition information of various objects arranged in the space where the robot 11 moves. For example, the map data may include object recognition information of fixed objects such as walls and doors, and movable objects such as flower pots and tables. In addition, the object recognition information may include a name, a type, a distance, a position, and the like.

[0116] In addition, the robot 11 can perform operations or driving by controlling the driving unit based on user control / interaction. At this time, the robot 11 can obtain information about the interaction intention according to the user's actions or voice utterances, determine a response based on the obtained intention information, and perform an operation.

[0117] <AI + Autopilot>

[0118] The autonomous vehicle 12 can be implemented as a mobile robot, a vehicle, an unmanned aerial vehicle, etc. by applying AI technology.

[0119] The autonomous vehicle 12 may include an autonomous driving control module for controlling the autonomous driving function, and the autonomous driving control module may refer to a software module or a chip that implements the software module in hardware. Although the autonomous driving control module can be included as a component inside the autonomous vehicle 12, it can also be configured and connected as a separate hardware outside the autonomous vehicle 12.

[0120] The autonomous vehicle 12 can use the sensor information obtained from various types of sensors to obtain the status information of the autonomous vehicle 12, detect (identify) the surrounding environment and objects, generate map data, determine a movement path and a driving plan, or determine an operation.

[0121] Here, like the robot 11, the autonomous vehicle 12 can use the sensor information obtained from at least one or more sensors among lidar, radar, and a camera device to determine a movement path and a driving plan.

[0122] In particular, the autonomous driving vehicle 12 may identify an environment or an object in a hidden area or an area farther than a predetermined distance by receiving sensor information from an external device, or may receive information identified directly from an external device.

[0123] The autonomous vehicle 12 may perform the above operations using a learning model configured by at least one or more artificial neural networks. For example, the autonomous vehicle 12 may use a learning model to identify the surrounding environment and objects, and use the identified surrounding environment information or object information to determine a driving route. Here, the learning model may be learned by the autonomous vehicle 12 itself or by an external device such as the AI ​​server 16.

[0124] At this time, although the autonomous driving vehicle 12 itself can perform operations by generating results using the learning model, it can perform operations by transmitting sensor information to an external device (such as the AI ​​server 16) and receiving results generated based on it.

[0125] The autonomous driving vehicle 12 may determine a moving path and a driving plan using at least one or more of map data, object information detected from sensor information, and object information acquired from an external device, and control a driving unit to drive the autonomous driving vehicle 12 according to the determined moving path and driving plan.

[0126] The map data may include object recognition information of various objects arranged in a space (e.g., a road) where the autonomous driving vehicle 12 travels. For example, the map data may include object recognition information of fixed objects such as street lamps, rocks, buildings, etc. and movable objects such as vehicles, pedestrians, etc. In addition, the object recognition information may include name, type, distance, location, etc.

[0127] In addition, the autonomous driving vehicle 12 can perform operations or drive by controlling the driving unit based on user control / interaction. At this time, the autonomous driving vehicle 12 can obtain information about the interaction intention based on the user's actions or voice utterances, determine a response based on the obtained intention information, and perform operations.

[0128] <AI+XR>

[0129] The XR device 13 can be implemented as a head-mounted display (HMD), a head-up display (HUD) set in a vehicle, a television, a mobile phone, a smart phone, a computer, a wearable device, a home appliance, a digital signage, a vehicle, a fixed robot, a mobile robot, etc. by applying AI technology.

[0130] When the XR device 13 analyzes 3D point cloud data or image data obtained through various sensors or from external devices and generates position data and attribute data of three-dimensional points, it can obtain information about the surrounding space or real objects, render the XR object to be output, and output the XR object. For example, the XR device 13 can output an XR object including additional information about the identified object to correspond to the identified object.

[0131] The XR device 13 can perform the above operations using a learning model configured by at least one or more artificial neural networks. For example, the XR device 13 can use the learning model to identify real objects from the three-dimensional point cloud data or image data and provide information corresponding to the identified real objects. Here, the learning model can be learned by the XR device 13 itself or by an external device such as the AI server 16.

[0132] At this time, although the XR device 13 itself can perform operations by generating results using the learning model, it can perform operations by transmitting sensor information to an external device (such as the AI server 16) and receiving the results generated therefrom.

[0133] <AI + Robot + Autopilot>

[0134] The robot 11 can be implemented as a guiding 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 and autopilot technology.

[0135] The robot 11 applying AI technology and autopilot technology can mean the robot itself with an autopilot function or the robot 11 that interacts with the autonomous driving vehicle 12.

[0136] The robot 11 with an autopilot function generally can refer to a device that moves along a given path by itself or determines a moving path by itself and moves along that path without the control of a user.

[0137] The robot 11 and the autonomous driving vehicle 12 with an autopilot function can use a common sensing method to determine one or more of the moving path and the driving plan. For example, the robot 11 and the autonomous driving vehicle 12 with an autopilot function can use the information sensed by lidar, radar, or a camera device to determine one or more of the moving path and the driving plan.

[0138] The robot 11 that interacts with the autonomous driving vehicle 12 can exist separately from the autonomous driving vehicle 12 and can be linked to the autopilot function inside or outside the autonomous driving vehicle 12, or perform operations associated with the user on the autonomous driving vehicle 12.

[0139] At this time, the robot 11 interacting with the autonomous driving vehicle 12 can control or assist the autonomous driving function of the autonomous driving vehicle 12 by obtaining sensor information on behalf of the autonomous driving vehicle 12 and providing it to the autonomous driving vehicle 12, or by obtaining sensor information, generating surrounding environment information or object information and providing this information to the autonomous driving vehicle 12.

[0140] Alternatively, the robot 11 interacting with the autonomous driving vehicle 12 can monitor the user on the autonomous driving vehicle 12, or control the functions of the autonomous driving vehicle 12 through interaction with the user. For example, in the case where the driver is determined to be in a drowsy state, the robot 11 can activate the autonomous driving function of the autonomous driving vehicle 12 or assist in the control of the driving unit of the autonomous driving vehicle 12. Here, in addition to the autonomous driving function, the functions of the autonomous driving vehicle 12 controlled by the robot 11 can also include the functions provided by the navigation system or audio system provided inside the autonomous driving vehicle 12.

[0141] Alternatively, the robot 11 interacting with the autonomous driving vehicle 12 can provide information to the autonomous driving vehicle 12 or assist external functions of the autonomous driving vehicle 12. For example, the robot 11 can provide traffic information including signal information, etc., such as intelligent traffic lights, etc., to the autonomous driving vehicle 12, or can interact with the autonomous driving vehicle 12 to automatically connect a charger to a charging port, such as an automatic charger for an electric vehicle.

[0142] <AI+Robot+XR>

[0143] The robot 11 can be implemented as a guiding robot, a transportation 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.

[0144] The robot 11 applying XR technology can mean a robot that is the target of control / interaction within the XR image. In this case, the robot 11 can be separated from the XR device 13 and linked to the XR device 13.

[0145] When the robot 11, which is the target of control / interaction within the XR image, obtains sensor information from a sensor including a camera device, 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. Additionally, the robot 11 can operate based on a control signal input through the XR device 13 or the interaction of the user.

[0146] For example, the user can confirm the XR image corresponding to the viewpoint of the remotely connected robot 11 through an external device such as the XR device 13, and adjust the autonomous driving path, control operation or driving of the robot 11, or confirm information about surrounding objects through interaction.

[0147] <AI + Autonomous Driving + XR>

[0148] The autonomous driving vehicle 12 can be implemented as a mobile robot, vehicle, unmanned aerial vehicle, etc. by applying AI technology and XR technology.

[0149] The autonomous driving vehicle 12 applying XR technology can mean an autonomous driving vehicle provided with a device for providing an XR image, an autonomous driving vehicle that is the target of control / interaction within the XR image, etc. In particular, the autonomous driving vehicle 12 that is the target of control / interaction within the XR image can be separated from the XR device 13 and linked to the XR device 13.

[0150] The autonomous driving vehicle 12 provided with a device for providing an XR image can obtain sensor information from sensors including a camera device, and output an XR image generated based on the obtained sensor information. For example, since the autonomous driving vehicle 12 is provided with a HUD and outputs an XR image, an XR object corresponding to a real object or an object on the screen can be provided to the passengers.

[0151] At this time, when the XR object is output to the HUD, at least a part of the XR object can be output to overlap with the actual object that the passenger is looking at. On the other hand, when the XR object is output to a display provided inside the autonomous driving vehicle 12, at least a part of the XR object can be output to overlap with the object on the screen. For example, the autonomous driving vehicle 12 can output XR objects corresponding to objects such as roads, other vehicles, traffic lights, traffic signs, two-wheeled vehicles, pedestrians, buildings, etc.

[0152] When the autonomous driving vehicle 12 that is the target of control / interaction within the XR image obtains sensor information from sensors including a camera device, the autonomous driving vehicle 12 or the XR device 13 can generate an XR image based on the sensor information, and the XR device 13 can output the generated XR image. In addition, the autonomous driving vehicle 12 can operate based on a control signal input through an external device such as the XR device 13 or the interaction of the user.

[0153] [Extended Reality Technology]

[0154] Extended reality (XR) generally refers to virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology only provides real-world objects, backgrounds, etc. as CG images, AR technology also provides CG images virtually generated on real object images, and MR technology is a computer graphics technology that mixes and combines virtual objects in the real world.

[0155] MR technology is similar to AR technology in that it shows real objects and virtual objects together. However, the difference is that while AR technology uses virtual objects to supplement real objects, MR technology uses virtual objects and real objects as equal features.

[0156] XR technology can be applied to head-mounted displays (HMDs), heads-up displays (HUDs), mobile phones, tablets, laptops, desktops, televisions, digital signage, etc., and devices that apply XR technology can be referred to as XR devices.

[0157] Hereinafter, an electronic device for providing extended reality according to an embodiment of the present invention will be described. In particular, a projection device applied to augmented reality and an electronic device including the projection device will be described in detail.

[0158] Figure 2 is a block diagram showing a configuration of an extended reality electronic device 20 according to an embodiment of the present invention.

[0159] Reference Figure 2 , the extended reality electronic device 20 may include a wireless communication unit 21, an input unit 22, a sensing unit 23, an output unit 24, an interface unit 25, a memory 26, a control unit 27, and a power supply unit 28. Figure 2 The components shown in are not necessary to implement the electronic device 20, and thus the electronic device 20 described in this specification may have more or fewer components than those listed above.

[0160] More specifically, among the components listed above, the wireless communication unit 21 may include one or more modules that allow wireless communication between the electronic device 20 and a wireless communication system, between the electronic device 20 and another electronic device, or between the electronic device 20 and an external server. In addition, the wireless communication unit 21 may include one or more modules that connect the electronic device 20 to one or more networks.

[0161] 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.

[0162] The input unit 22 may include a camera or an image input unit for inputting an image signal, a microphone or an audio input unit for inputting an audio signal, and a user input unit (e.g., a touch key, a mechanical key, etc.) for receiving information from a user. Voice data or image data collected by the input unit 22 may be analyzed and processed as a control command of the user.

[0163] The sensing unit 23 may include one or more sensors for sensing at least one of information inside the electronic device 20 , information about the surrounding environment around the electronic device 20 , and user information.

[0164] For example, the sensing unit 23 may include at least one of the following: a proximity sensor, an illumination sensor, a touch sensor, an acceleration sensor, a magnetic sensor, a gravity sensor (G sensor), a gyroscope sensor, a motion sensor, an RGB sensor, an infrared (IR) sensor, a finger scan sensor, an ultrasonic sensor, an optical sensor (e.g., a camera), a microphone, a battery gauge, an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, a radiation detection sensor, a heat detection sensor, a gas detection sensor, etc.), and a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). At the same time, the electronic device 20 disclosed in the present specification may combine and utilize information sensed by at least two or more of these sensors.

[0165] The output unit 24 is used to generate output related to vision, hearing or touch, and may include at least one of a display unit, an audio output unit, a tactile module and an optical output unit. The display unit may be configured with a layer structure together with a touch sensor, or may be formed to be integrated with a touch sensor to implement a touch screen. The touch screen may provide an output interface between the augmented reality electronic device 20 and the user, and at the same time be used as a user input means to provide an input interface between the augmented reality electronic device 20 and the user.

[0166] The interface unit 25 serves as a passage between various types of external devices connected to the electronic device 20. Through the interface unit 25, the electronic device 20 can receive virtual reality or augmented reality content from the external device and perform mutual interaction by exchanging various input signals, sensing signals, and data.

[0167] 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 provided with an identification module, an audio input / output (I / O) port, a video input / output (I / O) port, and a headphone port.

[0168] In addition, the memory 26 stores data supporting various functions of the electronic device 20. The memory 26 may store a plurality of application programs (or applications) operating on the electronic device 20, data and commands for the operation of the electronic device 20. At least some of the application programs may be downloaded from an external server through wireless communication. In addition, at least some of the application programs may exist in the electronic device 20 from the time of shipment and be used for basic functions of the electronic device 20 (e.g., incoming and outgoing call functions, incoming and outgoing message functions).

[0169] In addition to operations related to application programs, the control unit 27 generally controls the overall operation of the electronic device 20. The control unit 27 may process signals, data, information, etc. input or output through the above-mentioned components.

[0170] In addition, the control unit 27 can control at least some of the components to provide appropriate information or processing functions to the user by driving the application stored in the memory 26. In addition, the control unit 27 can operate at least two or more of the components included in the electronic device 20 in combination to drive the application.

[0171] In addition, the control unit 27 may detect the movement of the electronic device 20 or the user using a gyro sensor, a gravity sensor, a motion sensor, etc. included in the sensing unit 23. Alternatively, the control unit 27 may detect an object approaching the electronic device 20 or the user using a proximity sensor, an illumination 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 detect the movement of the user through a sensor provided in a controller operating in conjunction with the electronic device 20.

[0172] In addition, the control unit 27 may perform operations (or functions) of the electronic device 20 using application programs stored in the memory 26 .

[0173] The power supply unit 28 receives external power or internal power under the control of the control unit 27, and supplies power to each of the components included in the electronic device 20. The power supply unit 28 includes a battery, and the battery may be provided in an embedded or replaceable form.

[0174] According to various embodiments described below, at least some of the components can operate in cooperation with each other to implement the operation, control or control method of the electronic device. In addition, the operation, control or control method of the electronic device can be implemented on the electronic device by driving at least one application stored in the memory 26.

[0175] Hereinafter, the electronic device described as an example of the present invention will be described based on an embodiment applied to a head mounted display (HMD). However, embodiments of the electronic device according to the present invention may include mobile phones, smart phones, laptop computers, digital broadcast terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation, tablet computers, tablet computers, ultrabooks, and wearable devices. In addition to HMD, wearable devices may include smart watches, contact lenses, VR / AR / MR glasses, and the like.

[0176] Figure 3 is a perspective view showing an augmented reality electronic device according to an embodiment of the present invention.

[0177] like Figure 3 As shown, the electronic device according to the embodiment of the present invention may include a frame 100 , a projection device 200 , and a display unit 300 .

[0178] The electronic device may be provided as a glass type (smart glasses). The glass type electronic device is configured to be worn on the head of a human body, and may be provided with a frame (housing, housing, etc.) 100 for this purpose. The frame 100 may be made of a flexible material for easy wearing.

[0179] The frame 100 is supported on the head and provides a space for installing various components. As shown in the figure, electronic components such as a projection device 200, a user input unit 130, an audio output unit 140, etc. can be installed on the frame 100. In addition, a lens covering at least one of the left eye and the right eye can be detachably installed on the frame 100.

[0180] As shown in the figure, the frame 100 can be formed in the shape of glasses worn on the face of the user's body, but is not necessarily limited to this, and can also be formed in the shape of goggles or the like worn on the user's face in close contact.

[0181] Such a frame 100 may include a front frame 110 having at least one opening and a plurality of openings in the y direction (in the Figure 3 A pair of side surface frames 120 extending from the front side frame 110 and intersecting with the front side frame 110 and parallel to each other.

[0182] The length DI in the x-direction and the length LI in the y-direction of the frame 100 may be the same or different.

[0183] The projection device 200 is provided to control various electronic components provided in the electronic device. The projection device 200 may be used interchangeably with "optical output device", "optical projection device", "optical radiation device", "optical device" and the like.

[0184] The projection device 200 may generate an image or video of a series of images shown to a user. The projection device 200 may include an image source panel that generates images and a plurality of lenses for diffusing and converging light generated from the image source panel.

[0185] The projection device 200 may be fixed to any one of the two side surface frames 120. For example, the projection device 200 may be fixed to the inside or outside of any one of the side surface frames 120, or may be integrally formed to be embedded in the inside of any one of the side surface frames 120. Alternatively, the projection device 200 may be fixed to the front side frame 110, or may be provided to be separated from the electronic device.

[0186] The display unit 300 can be implemented in the form of a head mounted display (HMD). HMD refers to a display mounted on the head and directly showing an image in front of the user's eyes. When the user wears the electronic device, the display unit 300 can be arranged to correspond to at least one of the left eye and the right eye to provide an image directly in front of the user's eyes. In the figure, the display unit 300 is located in the part corresponding to the right eye so that the image can be output toward the right eye of the user. However, as described above, it is not limited thereto and can be set to correspond to both the left eye and the right eye.

[0187] The display unit 300 may allow the user to see an image generated by the projection device 200 while the user visually recognizes the external environment. For example, the display unit 300 may project an image in a display area using a prism.

[0188] In addition, the display unit 300 may be formed to be semi-transparent so that the projected image and the general field of view in front (the range seen by the user through the eyes) can be seen at the same time. For example, the display unit 300 may be semi-transparent and formed of an optical element including glass.

[0189] In addition, the display unit 300 may be inserted into and fixed to the opening included in the front frame 110, or may be located at the rear side of the opening (i.e., between the opening and the user) and fixed to the front frame 110. Although the display unit 300 is shown as an example in the drawings as being located at the rear side of the opening and fixed to the front frame 110, the display unit 300 may be provided and fixed at various positions in the frame 100.

[0190] like Figure 3 As shown, when the projection device 200 inputs image light of an image to one side of the display unit 300 , the electronic device may allow the image light to be emitted to the other side through the display unit 300 , so that the user can see the image generated by the projection device 200 .

[0191] Therefore, the user can see the image generated by the projection device 200 while seeing the external environment through the opening of the frame 100. That is, it can be seen that the image output by the display unit 300 overlaps with the general field of view. The electronic device can provide augmented reality (AR) that overlaps a virtual image on a real image or background and shows the overlapped images as a single image using these display features.

[0192] In addition to these operations, images generated from the external environment and the projection device 200 can be provided to the user with a time difference in a short period of time that cannot be recognized by the person. For example, in one frame, the external environment can be provided to the person in one part, and the image from the projection device 200 can be provided to the person in another part.

[0193] Alternatively, both overlap and time difference may be provided.

[0194] Figures 4 to 6 1 is a conceptual diagram for explaining various display methods applicable to a display unit according to an embodiment of the present invention.

[0195] Specifically, Figure 4 is a view for explaining an embodiment of a prism-type optical element, Figure 5 is a view for explaining an embodiment of a waveguide type optical element, and Figure 6 It is a view for explaining an embodiment of a surface reflective optical element.

[0196] like Figure 4 As shown, a prism-type optical element may be used in the display unit 300 - 1 according to an embodiment of the present invention.

[0197] As an implementation method, Figure 4 A flat glass optical element shown in (a) in which the surface to which the image light is input and the surface 300a from which the image light is emitted are flat surfaces, or Figure 4 A free-form glass optical element shown in (b) in which a surface 300b from which image light is emitted is formed as a curved surface without a predetermined radius of curvature may be used as a prism-type optical element.

[0198] The flat glass optical element can receive the image light generated by the projection device 200 through a flat side surface, reflect the image light using the total reflection mirror 300a disposed therein, and emit the image light toward the user. Here, the total reflection mirror 300a disposed inside the flat glass optical element can be formed inside the flat glass optical element by laser.

[0199] The free-form glass optical element may be configured to be thinner as it is away from the incident surface, and may receive the image light generated by the projection device 200 through the side surface having the curved surface, totally reflect the image light therein, and emit the image light toward the user.

[0200] like Figure 5 As shown, a waveguide type optical element or a light guide optical element (LOE) may be used in a display unit 300 - 2 according to another embodiment of the present invention.

[0201] As an embodiment, the waveguide or lightguide optical element may include Figure 5 (a) shows a glass optical element of the partial reflector (segmented beam splitter) type, such as Figure 5 (b) The sawtooth prism type glass optical element, such as Figure 5 (c) A glass optical element with a diffractive optical element (DOE), such as Figure 5 (d) A glass optical element with a holographic optical element (HOE), such as Figure 5 (e) a glass optical element having a passive grating, and Figure 5 (f) Glass optical element with active grating shown.

[0202] like Figure 5 The glass optical element of the partial reflection mirror (segmented beam splitter) type shown in (a) may be provided with a total reflection mirror 301a on the side where the optical image is input, and a partial reflection mirror (segmented beam splitter) 301b on the side where the optical image is emitted.

[0203] Therefore, the optical image generated by the projection device 200 can be totally reflected from the total reflection mirror 301a inside the glass optical element, and the totally reflected optical image is partially separated and emitted by the partial reflection mirror (segmented beam splitter) 301b while guiding the light along the length direction of the glass, and is recognized by the user's eyes.

[0204] In such Figure 5 In the sawtooth prism type glass optical element shown in (b), the image light of the projection device 200 is input to the side surface of the glass in the diagonal direction, is totally reflected inside the glass, and is emitted to the outside of the glass through the sawtooth convex-concave portion 302 arranged on the side from which the image light is emitted, and is recognized by the user's eyes.

[0205] like Figure 5The glass optical element with a diffractive optical element (DOE) shown in (c) may be provided with a first diffraction unit 303a on the surface to which the optical image is input, and a second diffraction unit 303b on the surface from which the optical image is emitted. The first diffraction unit 303a and the second diffraction unit 303b may be provided in the form of patterning a specific pattern on the surface of the glass or attaching a separate diffraction film.

[0206] Therefore, the optical image generated by the projection device 200 is input and diffracted by the first diffraction unit 303a, is totally reflected and guided along the length direction of the glass, and is emitted by the second diffraction unit 303b, and is recognized by the user's eyes.

[0207] like Figure 5 The glass optical element with a holographic optical element (HOE) shown in (d) may be provided with an outcoupler 304 inside the glass on the side from which the optical image is emitted. Therefore, the optical image may be input from the projection device 200 in a diagonal direction through the side surface of the glass, be totally reflected and guided along the length direction of the glass, be emitted by the outcoupler 304, and be recognized by the user's eyes. By slightly changing the structure, this holographic optical element may be further subdivided into a structure with a passive grating and a structure with an active grating.

[0208] like Figure 5 The glass optical element with a passive grating shown in (e) may be provided with an in-coupler 305a on the surface opposite to the glass surface on the side where the optical image is input, and an out-coupler 305b on the surface opposite to the glass surface on the side 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 with a passive grating.

[0209] Therefore, the optical image input into the glass surface on the incident side of the glass can be totally reflected from the in-coupler 305a arranged on the opposite surface, guided along the length direction of the glass, emitted by the out-coupler 305b through the surface on the opposite side of the glass, and recognized by the user's eyes.

[0210] like Figure 5 The glass optical element with active grating shown in (f) may have an in-coupler 306a formed as an active grating disposed inside the glass on the side where the optical image is input, and an out-coupler 306b formed as an active grating disposed inside the glass on the side where the optical image is emitted.

[0211] Therefore, the optical image input into the glass may be totally reflected from the in-coupler 306a, guided along the length direction of the glass, emitted to the outside of the glass by the out-coupler 306b, and recognized by the user's eyes.

[0212] According to a modified example, a pin mirror type optical element may be used as the display unit.

[0213] In addition, since a plurality of flat surfaces each having a different incident angle of an optical image is formed into a single glass, as Figure 6 The surface reflective optical element of the freeform combiner type shown in (a) can use a freeform combiner glass formed to have an integral curved surface to perform a function as a combiner. In the freeform combiner glass 300, an optical image can enter each area at a different incident angle and be output to a user.

[0214] like Figure 6 The surface reflective optical element of the flat HOE type shown in (b) may be provided with a holographic optical element (HOE) 311 coated or patterned on the surface of the flat glass, and the optical image input from the projection device 200 may pass through the holographic optical element 311, be reflected from the surface of the glass, pass through the holographic optical element 311 again, and be emitted toward the user.

[0215] like Figure 6 The free-form HOE type surface reflective optical element shown in (c) may be provided with a holographic optical element (HOE) 313 coated or patterned on the surface of the free-form glass, and the operating principle may be the same as Figure 6 Same as described in (b).

[0216] Figure 7 is a perspective view showing a projection device according to an embodiment, and Figure 8 is an exploded perspective view showing a projection device according to an embodiment.

[0217] Reference Figure 7 and Figure 8 , the projection device 200 according to the embodiment may include an outer lens LS, a lens barrel 210, a housing 220, a light source unit 230, a light guide LG, a lens FL, and an additional housing 240. In addition, the projection device 200 may include a first spacer SP1 and a second spacer SP2.

[0218] First, the outer lens LS may be inserted into the lens barrel 210. That is, the lens barrel 210 may be located inside the projection device 200 and accommodate the outer lens LS. In addition, the lens barrel 210 may accommodate the light guide LG, the lens LF, the first spacer PS1, and the second spacer SP2.

[0219] The lens barrel 210 may have a space for accommodating the above-mentioned components or additional optical elements. For example, the lens barrel 210 may include a first groove and a second groove described below. The outer lens LS may be disposed in the first groove. In addition, the light guide LG may be disposed in the second groove. In addition, the first groove and the second groove may be spaced apart from each other in the lens barrel 210. That is, the lens barrel 210 has a space (e.g., a groove) 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. Therefore, the insertion or combination of the outer lens and the light guide may be facilitated.

[0220] In contrast, when the spaces are connected to each other, miniaturization of the projection device can be achieved.

[0221] The outer lens LS is accommodated in the lens barrel 210, and the first spacer SP1 may be located outside the outer lens LS. Since the first spacer SP1 is disposed outside the outer lens LS accommodated in the first groove of the lens barrel 210, detachment of the outer lens LS may be prevented.

[0222] The lens barrel 210 may include a plurality of holes connected to the second groove. The plurality of holes may be located on the side surface of the lens barrel 210. Therefore, the light emitted from the light source unit 230 described below may enter the light guide LG. In addition, the light that has entered the light guide LG may be reflected and pass through or penetrate the outer lens LS to be provided to the waveguide or waveguide described above. To this end, the first groove and the second groove may be connected to each other through a penetration hole. That is, the light reflected from the light guide LG in the second groove may be provided to the outer lens LS of the first groove through the penetration hole. In addition, as described above, the light from the light source unit 230 may be emitted to the inner light guide LG through a plurality of holes provided on the side surface of the lens barrel 210.

[0223] The light guide LG may be located within the lens barrel 210. The light guide LG may be connected to a lens FL described below.

[0224] The light guide LG may be configured by at least one prism. For example, the light guide LG may be configured by combining or joining a plurality of prisms. The light guide LG may include a prism. The prism may include, for example, an X-prism as a reflective member. As an embodiment, the light guide LG may be a structure combining at least two or more prisms. In addition, the light guide LG may 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.

[0225] In addition, the light guide LG may include at least two or more coated surfaces (reflective members or reflective sheets). One of these at least two or more coated surfaces may reflect light of a first wavelength and light of a second wavelength, and transmit light of a third wavelength. That is, the coated surface may reflect light of a predetermined wavelength band. Therefore, for each of the lights emitted from the plurality of light sources 232a, 232b, 232c, light of a desired wavelength band may be reflected from the light guide LG. For example, the light passing through the light guide LG may be provided to the outer lens LS.

[0226] The lens FL may be connected to the light guide LG. The lens FL may be disposed adjacent to the light guide LG. For example, the lens FL may be in contact with the light guide. That is, the lens FL may be in contact with the light guide LG. In addition, the light guide LG may be in contact with the lens FL.

[0227] In addition, the lens FL may be combined with the light guide LG. In this case, the lens FL may be combined with the light guide LG through a bonding member or a coupling member. The bonding member or the coupling member may be located between the lens FL and the light guide LG.

[0228] The lens FL is located on the outer surface of the light guide LG and may be at least one or more. For example, the number of lenses FL may correspond to the number of light sources of the light source unit 230 described below. When the number of light sources is three, the number of lenses FL may also be three.

[0229] For example, the lens FL may include a first lens, a second lens, and a third lens corresponding to the light source. 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.

[0230] The second spacer SP2 may be located inside the lens 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 located outside the light guide LG and the lens FL. Therefore, the light guide LG and the lens FL may not be disassembled from the lens barrel 210. In other words, the second spacer SP2 may inhibit the light guide LG and the lens FL from being detached from the lens barrel 210.

[0231] The housing 220 may be located outside the lens barrel 210. The housing 220 may surround the lens barrel 210. For example, the housing 220 may be arranged to surround at least one area of ​​the lens barrel 210. In addition, the housing 220 may include a space for accommodating a light source. In addition, the housing 220 may include at least one housing hole. The light source may be arranged inside the housing hole. In addition, light emitted from the light source may be provided to the lens FL and the light guide LG through at least one housing hole. The housing 220 may be arranged outside the lens barrel 210 and include a space for accommodating the lens barrel 210 and the light source unit 230.

[0232] The light source unit 230 may be at least one or more. 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.

[0233] The first light source unit 230a may overlap the outer lens LS in the 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 device 230 is reflected from the light guide LG and emitted to the above-mentioned display unit.

[0234] The second light source unit 230b and the third light source unit 230c may be positioned to face each other. Alternatively, the second light source unit 230b and the third light source unit 230c may be positioned to be opposite to each other.

[0235] The second light source unit 230b and the third light source unit 230c may overlap in the first direction (X-axis direction). The first direction (X-axis direction) may be a direction perpendicular to the second direction (Y-axis direction). In addition, the third direction (Z-axis direction) may be a direction perpendicular to the first direction and the second direction.

[0236] In addition, 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. In addition, directions of light emitted from the second light source unit 230b and the third light source unit 230c may be opposite to each other.

[0237] Each light source unit may include a substrate 231a, 231b, 231c, a light source 232a, 232b, 232c, and an optical element 233a, 233b, 233c.

[0238] In addition, the substrates 231a, 231b, 231c, the light sources 232a, 232b, 232c and the optical elements 233a, 233b, 233c may be sequentially located inside the light source unit. That is, the optical element may be located adjacent to the light guide LG compared to the substrate and the light source.

[0239] The substrates 231a, 231b, 231c may be connected to the light sources 232a, 232b, 232c and transmit electric power so that the light sources 232a, 232b, 232c may emit light.

[0240] The substrates 231 a , 231 b , and 231 c may be located at the outermost side of the housing 220 .

[0241] In addition, the substrates 231a, 231b, 231c may include a first substrate 231a, a second substrate 231b, and a third substrate 231c. The first substrate 231a may overlap with 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). In addition, the second substrate 231b and the third substrate 231c may be positioned to face each other in the housing 220. In addition, the first substrate 231a may be located in a region between the second substrate 231b and the third substrate 231c.

[0242] The light sources 232a, 232b, 232c may emit light. For example, the light emitted from the light sources 232a, 232b, 232c may enter the light guide LG inside the housing 220. The light guide LG may be located inside the housing 220.

[0243] In addition, the light sources 232a, 232b, 232c may be one or more. The light sources 232a, 232b, 232c may include a first light source 232a, a second light source 232b, and a third light source 232c. In addition, the light sources 232a, 232b, 232c may be disposed on each substrate.

[0244] That is, in the light source device 230, the light sources 232a, 232b, 232c may be single or plural. For example, the light sources 232a, 232b, 232c may be plural 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 to face each other. The second light source 232b and the third light source 232c may be positioned to overlap each other in the first direction (X-axis direction). In addition, the light guide LG may be located between the second light source 232b and the third light source 232c. Therefore, the light guide LG may overlap with the second light source 232b and the third light source 232c.

[0245] The first to third light sources 232a to 232c may emit light toward the light guide LG. In addition, the first light source 232a may overlap the light guide LG in the second direction. With such a configuration, the projection device 200 may have a compact light source device 230.

[0246] In addition, each of the first light source 232a, the second light source 232b and the third light source 232c can emit light of the same or different wavelengths or colors. For example, each of the first light source 232a, the second light source 232b and the third light source 232c can emit red light, green light or blue light.

[0247] Optical elements 233a, 233b, 233c may be at least one or more. Optical elements 233a, 233b, 233c may include first optical element 233a, second optical element 233b, and third optical element 233c corresponding to first light source 232a, second light source 232b, and third light source 232c, respectively. First optical element 233a, second optical element 233b, and third optical element 233c may include filters. In addition, first optical element 233a, second optical element 233b, and third optical element 233c may include glass. First optical element 233a, second optical element 233b, and third optical element 233c may filter light. Alternatively, first optical element 233a, second optical element 233b, and third optical element 233c may block foreign matter from entering the light source at an early stage. In other words, the light source may be protected.

[0248] The additional housing 240 may be provided outside the lens barrel 210 to surround the lens barrel 210. The lens barrel 210 is combined with the housing 220 in various coupling methods, and the additional housing 240 may be combined with the housing 220. The additional housing 240 may also be combined with the lens barrel 210. Therefore, the projection device 200 according to the embodiment may provide improved reliability.

[0249] Fig. 9 is a perspective view showing a lens barrel in a projection device according to an embodiment, Fig.10 is a side view showing a lens barrel in a projection device according to an embodiment, and Fig.11 is a bottom view showing a lens barrel into which a light guide is inserted in the projection device according to the embodiment.

[0250] Further references Figures 9 to 11 In the projection device according to the embodiment, the lens 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). In addition, the second groove 210h2 and the first groove 210h1 may be sequentially arranged along the second direction (Y-axis direction).

[0251] An outer lens may be disposed in the first groove 210h1. In addition, a light guide may be disposed in the second groove 210h2.

[0252] In addition, the first groove 210h1 and the second groove 210h2 may be spaced apart from each other in the second direction (Y-axis direction). In addition, the first groove 210h1 and the second groove 210h2 may be connected to each other through the penetration hole as described above. Therefore, the light reflected from the light guide in the second groove 210h2 may be provided to the outer lens in the first groove 210h1 and finally output to the display unit.

[0253] The lens barrel 210 may include a protrusion unit 210p extending toward the outside. The protrusion unit 210p may include a coupling hole 210ph. They may be combined with the housing through the coupling hole 210ph.

[0254] The lens barrel 210 may include a plurality of lens barrel holes so that light emitted from a plurality of light sources may be provided to the light guide. The number of lens barrel holes may correspond to the number of light sources. For example, the lens barrel holes may include a first lens barrel hole 210h2a, a second lens barrel hole 210h2b, and a third lens barrel hole 210h2c. The first lens barrel hole 210h2a, the second lens barrel hole 210h2b, and the third lens barrel hole 210h2c may be provided on the side surface of the lens barrel 210.

[0255] The first lens barrel hole 210h2a may overlap with the light guide along the second direction. The second lens barrel hole 210h2b and the third lens barrel hole 210h2c may be spaced apart from each other in the first direction (X-axis direction). In addition, the second lens barrel hole 210h2b and the third lens barrel hole 210h2c may overlap with each other in the first direction (X-axis direction). The first lens barrel hole 210h2a may be located between the second lens barrel hole 210h2b and the third lens barrel hole 210h2c.

[0256] In addition, the first, second and third barrel holes 210h2a, 210h2b and 210h2c may be connected to the second groove 210h2. That is, the first, second and third barrel holes 210h2a, 210h2b and 210h2c may overlap with the light guide in the first direction or the second direction.

[0257] In addition, the second lens barrel hole 210h2b and the third lens barrel hole 210h2c may include a fixture groove gr formed at the edge. Therefore, after the light guide is accommodated in the second groove 210h2, the lenses (e.g., the second lens and the third lens) adjacent to the second lens barrel hole 210h2b and the third lens barrel hole 210h2c can easily contact the light guide. For example, when a fixture or the like is located in the fixture groove gr, the lens can be easily placed on the outer side surface of the light guide.

[0258] The protrusion unit 210p may extend toward the outside from the outer surface of the lens barrel 210 except the outer surface where the second lens barrel hole 210h2b and the third lens barrel hole 210h2c are located. Therefore, the reliability of the lens barrel can be improved. In addition, the manufacture of the lens barrel can be more convenient.

[0259] In addition, the lens barrel 210 may include a lens barrel groove 210gr. The inner side surface of the second groove 210h2 in the lens barrel 210 may include a lens barrel groove 210hr convex toward the outside. Therefore, the second spacer may easily contact the inner side surface of the lens barrel 210.

[0260] In addition, the size S2 of the second groove 210h2 in the lens barrel 210 may be larger than the size S1 of the light guide LG. Therefore, optical alignment with respect to the light guide LG and the like may be easily performed. In addition, the size will be described below based on the XZ plane.

[0261] In addition, the barrel 210 may include a barrel protrusion 210pr protruding toward the light guide LG on the inner side surface. The barrel protrusion 210pr may overlap the second barrel hole 210h2b and the third barrel hole 210h2c in the first direction (X-axis direction).

[0262] The barrel protrusion 210pr may contact the light guide LG. At this time, the size S1 of the light guide LG may be greater than the size S3 of the barrel protrusion 210pr. Alternatively, the size S3 of the barrel protrusion 210pr may be less than the size S1 of the light guide LG. Therefore, although the light guide LG is placed inside the barrel 210 and contacts the barrel protrusion 210pr, the light guide LG may not contact the inner side surface of the barrel 210. In other words, the contact between the light guide LG and the inner side surface of the barrel 210 can be reduced to suppress damage to the light guide LG. In other words, the reliability of the barrel 210 and the projection device can be improved.

[0263] Fig.12 is a view showing a lens barrel in a projection device according to an embodiment, which illustrates a combination of an outer lens, a first spacer, a light guide, a lens, and a second spacer; Fig.13 is a view illustrating a combination of a lens barrel, a housing, and an additional housing in a projection device according to an embodiment; and Fig.14 1 is a view illustrating a combination of a housing and a light source unit in a projection device according to an embodiment.

[0264] Reference Figure 12 to Figure 14 , the outer lens LS may be inserted into the first groove 210h1 of the lens barrel 210. In addition, the first spacer SP1 may be located outside the outer lens LS inside the first groove 210h1 of the lens barrel 210. As described above, the first spacer SP1 contacts the outer lens LS and may suppress detachment of the outer lens LS.

[0265] In addition, the light guide LG and the lenses FL1, FL2, FL3 connected to the light guide LG may be inserted into the second groove 210h2. The light guide LG and the lenses FL1, FL2, FL3 connected to the light guide LG may be located inside the second groove 210h2. In addition, the second spacer SP2 may be located outside the light guide LG and the lenses FL1, FL2, FL3 connected to the light guide LG. The second spacer SP2 may be in contact with the light guide LG or the lens (particularly the first guide lens FL1). Therefore, the light guide LG and the lenses FL1, FL2, FL3 connected to the light guide LG may be suppressed from being detached.

[0266] 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). In addition, the outer lens LS, the light guide LG, and the first guide lens FL1 may be located between the first spacer SP1 and the second spacer SP2. Therefore, 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).

[0267] In addition, the lens barrel 210 can be inserted into the housing 220. That is, the lens barrel 210 can be located in the receiving hole of the housing 220. In addition, the housing 220 and the lens barrel 210 can be combined in various coupling methods. For example, the protrusion of the housing 220 and the coupling hole of the lens barrel 210 can be combined with each other. In addition, the housing 220 can be located at the lower part of the lens barrel 210, and the additional housing 240 can be located at the upper part of the lens barrel 210. By adding the housing 240, the lens barrel 210 can maintain the improved coupling strength with the housing 220.

[0268] In addition, after the lens barrel 210 is accommodated in the housing 220, a plurality of light source units may be inserted into the side surface of the housing 220. For example, the first light source unit 230a, the second light source unit 230b, and the third light source unit 230c may be located on the side surface of the housing 220.

[0269] Fig.15 : is a view showing the optical system of the projection device according to the first embodiment.

[0270] Reference Fig.15 In the projection device according to the first embodiment, the optical system may include an outer lens LS, a light guide LG, optical elements 233a, 233b, 233c and a lens FL. In addition, in the projection device, the optical system may further include light sources 232a, 232b, 232c.

[0271] In addition, the outer lens LS may include N lenses. In addition, the N lenses may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence adjacent to the waveguide WG.

[0272] In addition, the light guide LG may be in a hexahedral shape. Therefore, the light guide LG may include a first side surface or a first side LGS1 facing the first light source 232a. The light guide LG may include a second side surface or a second side LGS2 facing the second light source 232b. The light guide LG may include a third side surface or a third side LGS3 facing the third light source 232c. The light guide LG may include a fourth side surface or a fourth side LGS4 facing the fourth lens L4 or the nth lens Ln. In addition, the first side to the fourth side may mean a direction other than the side surface. For example, the first light source 232a may be located on a first side of the light guide LG.

[0273] In addition, the light source side may be a direction from the light guide LG toward the light. Although the light source side is shown in the drawings as a direction toward the first light source, the light source side may correspond to a direction toward a light source adjacent to corresponding parts of the first to third side lenses and the first to third optical elements. For example, the light source side of the second side lens or the second optical element corresponds to a direction toward the second light source 232b.

[0274] In addition, the lenses FL1 to FL3 may include a first side lens FL1, a second side lens FL2, and a third side lens FL3. The first guide lens may correspond to the first side lens FL1. In addition, the first side lens may be used interchangeably with "lens", "guide lens", etc.

[0275] In addition, the target side may correspond to a direction from the light guide WG toward the waveguide WG. Alternatively, the target side may correspond to a direction from each light source toward the waveguide WG with respect to a moving path of light.

[0276] In addition, the first side LGS1 and the fourth side LGS4 of the light guide LG may be opposite or facing each other. In addition, the second side LGS2 and the third side LGS3 of the light guide LG2 may be opposite or facing each other.

[0277] For example, the outer lens LS may include three or four lenses. Fig.17 As shown, the outer lens LS includes three lenses and can be configured by the first lens L1 to the third lens L3. At this time, the Nth lens corresponds to the third lens L3. In addition, as Fig.15 and Fig.16 As shown, the outer lens LS includes four lenses and may be configured by first lens L1 to fourth lens L4. At this time, the N-th lens Ln corresponds to the fourth lens L4.

[0278] In addition, a lens FL may be provided in the light guide LG. For example, the lens FL may be in contact with the light guide LG. The number of these lenses FL may correspond to the number of light sources. For example, when there are three light sources, the number of lenses FL may be three. In addition, when there is one light source, the number of lenses FL may be one.

[0279] In addition, hereinafter, the lens FL may be referred to as a "light source lens" or a "side lens". 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 in an area between the second side lens FL2 and the third side lens FL3. However, the first side lens FL1 may not overlap with 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 configured to be misaligned with the second side lens FL2 and the third side lens FL3 in the second direction (Y-axis direction). In addition, the first side lens FL1 may overlap with the light guide LG in the first direction (X-axis direction). For example, the first side lens FL1 may overlap with the light guide LG in the light emission direction of the first light source 232a.

[0280] In addition, optical elements 233a, 233b, 233c may be arranged between the light source and the light guide LG. For example, the optical element may include a first optical element 233a, a second optical element 233b, and a third optical element 233c. In addition, the light source may include a first light source 232a, a second light source 232b, and a third light source 232c.

[0281] The first optical element 233a may be disposed between the first light source 232a and the first side lens FL1. The second optical element 233b may be disposed between the second light source 232b and the second side lens FL2. The third optical element 233c may be disposed between the second light source 232c and the third side lens FL3.

[0282] The first optical element 233a may be disposed between the second optical element 233b and the third optical element 233c. The first optical element 233a may not overlap with the second optical element 233b and the third optical element 233c in the second direction (Y-axis direction). The first optical element 233a may be disposed so as not to be aligned with the second optical element 233b and the third optical element 233c in the second direction.

[0283] Therefore, the light emitted from the first light source 232a can be provided to the waveguide WG via the first optical element 233a, the first side lens FL1, the light guide LG, and the outer lens LS. The light emitted from the second light source 232b can be provided to the waveguide WG via the second optical element 233b, the second side lens FL2, the light guide LG, and the outer lens LS. The light emitted from the third light source 232c can be provided to the waveguide WG via the third optical element 233c, the third side lens FL3, the light guide LG, and the outer lens LS.

[0284] In addition, the first lens L1 may include a first surface S11 or a first target surface S11 as a surface on one side of the waveguide WG. In addition, the first lens L1 may include a second surface S12 or a second target surface S22 as a surface on one side of the light guide LG. The second lens L2 may include a third surface S31 or a third target surface S21 as a surface on one side of the waveguide WG. The second lens L2 may include a fourth surface S22 or a fourth target surface S22 as a surface on one side of the light guide LG. The third lens L3 may include a fifth surface S31 or a fifth target surface S31 as a surface on one side of the waveguide WG. The third lens L3 may include a sixth surface S32 or a sixth target surface S32 on one side of the light guide LG. In addition, the fourth lens L4 may include a seventh surface S41 or a fourth target surface S41 on one side of the waveguide WG. The fourth lens L4 may include an eighth surface S42 or an eighth target surface S42 on one side of the light guide LG. In addition, light from a plurality of light sources may be reflected from the light guide, pass through the outer lens LS, and radiate toward the aperture ST or the waveguide WG. Although the figure will be described based on the assumption that light emitted from the first light source 232a passes through the light guide LG and is provided to the waveguide, it should be understood that, as described above, light emitted from other light sources (the second light source and the third light source) is also reflected from the light guide LG and radiated toward the waveguide, etc.

[0285] Hereinafter, in various embodiments of the present invention, description will be made based on the above contents. In addition, except for the contents inconsistent with the contents described in other embodiments, the contents described below can be equally applied.

[0286] 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 of the light guide LG. In addition, the outer lens LS may be disposed on the fourth side of the light guide LG.

[0287] In addition, 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 embodiment, 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 of the outer lens LS or the first direction (X-axis direction). In other words, the first side LGS1 and the fourth side LGS4 of the light guide LG may overlap in the first direction and face each other.

[0288] In the present embodiment, the first side lens FL1 may be in contact with the light guide LG. For example, the first side lens FL1 may be bonded to the first side LGS1 of the light guide LG by a bonding member or the like, or may be integrally formed.

[0289] In addition, as described above, the outer lens LS may include the first lens L1 to the N-th lens Ln. As an embodiment, the outer lens LS may include the first lens L1 to the fourth lens L4. In addition, the first lens L1 may be disposed farthest from the fourth side LGS1 of the light guide LG. In addition, the fourth lens L4 may be disposed closest to the fourth side LGS1 of the light guide LG. In other words, the length between the fourth side LGS1 and the first lens L1 in the first direction (X-axis direction) may be greater than the length d4 between the fourth side LGS1 and the fourth lens L4 in the first direction (X-axis direction). In addition, the third lens L3 and the second lens L2 may be disposed between the first lens L1 and the fourth lens L4 in the first direction. For example, the third lens L3 may be located between the second lens L2 and the fourth lens L4. In addition, the second lens L2 may be disposed between the first lens L1 and the third lens L3.

[0290] As an embodiment, a side of the first lens L1 opposite to the side facing the fourth side LGS4 of the light guide LG may be convex. That is, the first lens L1 may be convex in the first direction (X-axis direction). Conversely, the first lens L1 may be concave in a direction opposite to the first direction. In other words, the first surface S11 of the first lens L1 may be concave toward the fourth side LGS4. In addition, the first lens L1 may be convex toward the waveguide WG. Therefore, the light or rays collected by the light guide LG may be easily guided to the light guide plate or the waveguide WG. In other words, the collected light may be effectively diffused.

[0291] In addition, the Nth lens, the last lens or the fourth lens L4 is disposed adjacent to the light guide LG, and the surface facing the fourth side LGS4 may be concave. That is, the eighth surface S42 may be concave toward the light guide LG. In addition, the eighth surface S42 may be convex toward the waveguide WG.

[0292] The seventh surface S43 may be convex toward the light guide LG. In addition, the seventh surface S43 may be concave toward the waveguide or in the first direction.

[0293] In addition, the fifth surface S31 may be convex in the first direction. Alternatively, the fifth surface S31 may be concave toward the light guide LG. The sixth surface S32 may be convex in the first direction or toward the waveguide. In addition, the sixth surface S32 may be convex in the first direction or toward the waveguide. Alternatively, the sixth surface S32 may be concave toward the light guide LG.

[0294] The third surface S21 may be convex in the first direction or toward the waveguide. Alternatively, the third surface S3 may be concave toward the light guide LG.

[0295] In addition, the fourth surface S22 may be convex in the first direction or toward the waveguide. Alternatively, the fourth surface S22 may be concave toward the light guide LG.

[0296] In addition, as described above, the first surface S11 may be convex toward the waveguide or in the first direction. In addition, the second surface S12 may be convex toward the light guide LG. Alternatively, the second surface S12 may be concave in the first direction or toward the waveguide.

[0297] In addition, in an embodiment, the surface of the first side lens FL1 adjacent to the first light source 232a may be convex. In other words, the surface of the first side lens FL1 on one side of the first light source 232a may be convex toward the first light source 232a. In addition, the surface of the first side lens FL1 on one side of the first light source 232a may be concave in the first direction.

[0298] In addition, in an embodiment, the refractive power or power of the first lens L1 may be positive. In addition, the refractive power or power of the Nth lens Ln or the fourth lens Ln may be negative.

[0299] The composite power of the lens 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.

[0300] In addition, the second light source 232b may be disposed on the second side of the light guide LG. In addition, the third light source 232c may be disposed on the third side of the light guide LG. In addition, as described above, the second side lens FL2 may be disposed between the second side LGS2 of the light guide LG and the second light source 232a. In addition, the third side lens FL3 may be disposed between the third side LGS3 of the light guide LG and the third light source 232c.

[0301] At this time, the surface of the second side lens FL2 adjacent to the second light source 232b may be convex. In addition, the surface of the third side lens FL3 adjacent to the third light source 232c may be convex. That is, in an embodiment, the surfaces of the first to third side lenses FL1 to FL3 facing the respective light sources may be convex toward the light sources emitting light to the respective side lenses.

[0302] The second side LGS2 of the light guide LG may be disposed to face the third side LGS3 of the light guide LG with the light guide LG interposed therebetween. Therefore, the second side lens FL2 and the third side lens FL3 may be arranged to face the light guide LG or symmetrically with respect to the light guide LG.

[0303] In addition, each side lens may be in contact with the light guide LG. For example, the first side lens FL1 may be in contact with or in contact with the light guide LG. In addition, the second side lens FL2 may be in contact with or in contact with the light guide LG. In addition, the third side lens FL3 may be in contact with or in contact with the light guide LG.

[0304] In addition, the radius of curvature of the first side lens FL1 on the optical axis of the surface adjacent to the light guide LG may be 100 mm or more. The optical axis may correspond to the central axis of the light emitted to the light guide by each light source. The radius of curvature of the second side lens FL2 on the optical axis of the surface adjacent to or in contact with the light guide LG may be 100 mm or more. In addition, the radius of curvature of the third side lens FL3 on the optical axis of the surface adjacent to or in contact with the light guide LG may be 100 mm or more.

[0305] In addition, as described above, each side lens may be combined with the light guide LG by a contact member or a bonding member. The bonding member may be made of a transparent material and have a refractive index similar to that of the light guide LG or the side lens. That is, the bonding member may be located between the light guide LG and one of the first to third side lenses FL1 to FL3.

[0306] The size of the side surface of the light guide LG may be equal to or greater than the size of the surface of each side lens adjacent to the light guide LG. At this time, although the size of the side surface of the light guide LG is different from the size of the bonding surfaces F11, F21, F31 of each side lens contacting the light guide, the length in one direction (the first direction, the second direction, or the third direction) may be larger or smaller. For example, the length of the side surface of the light guide LG in one direction (the first direction, the second direction, or the third direction) may be smaller than the length of the side lens (one of the first to third side lenses) in one direction (the first direction, the second direction, or the 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 the bonding surface of each side surface in two directions. In addition, the length of the side surface of the light guide LG in one direction may be smaller than the length of the bonding surface of the side lens in one direction.

[0307] In addition, as an embodiment, each side surface adjacent to the light guide LG or the bonding surfaces F11, F21, F31 may be a flat surface. For example, a surface of the first side lens FL1 adjacent to the light guide LG or the bonding surface F11 perpendicular to the first direction may be a flat surface.

[0308] Furthermore, the light guide LG may be located between the outer lens LS or the N lenses and each light source (first light source).

[0309] In addition, the effective diameter of the first lens 232a according to the embodiment may be the largest. That is, the effective diameter of the first lens L1 closest to the waveguide WG among the N lenses may be the largest. In addition, the effective diameter of the Nth lens (fourth lens) among the N lenses may be the smallest.

[0310] In addition, the effective diameter of the lens arranged between the first lens L1 and the N-th lens (the fourth lens) may be smaller than the effective diameter of the first lens L1. In addition, the effective diameter of the lens arranged between the first lens L1 and the N-th lens (the fourth lens) may be larger than the effective diameter of the N-th lens Ln (or the fourth lens L4).

[0311] As described above, the waveguide WG may be arranged to face the first lens L1. That is, the waveguide WG may be positioned adjacent to the first lens L1. In addition, an aperture ST may be provided in the waveguide WG. For example, the aperture ST may be located in a direction from the first lens L1 toward the waveguide. In addition, the aperture ST may be positioned adjacent to the first lens L1. The aperture ST may be positioned corresponding to a contact point between the projection device and the waveguide WG.

[0312] In addition, as an embodiment, a surface opposite to the surface facing the light guide of at least one lens among the N lenses may be concave toward the light guide LG. For example, surfaces S22, S32, S42 of the second to fourth lenses adjacent to the light guide LG may be concave toward the light guide LG.

[0313] In addition, the length of the N lenses in the first direction (X-axis direction) may be smaller than the length of the light guide LG in the first direction.

[0314] In addition, the light guide LG and the Nth lens or the fourth lens may be spaced apart from or in contact with each other. For example, the light guide LG and the Nth lens (fourth lens) may be combined with each other. Therefore, glare in the optical system may be reduced.

[0315] In addition, as described above, since the surface (eighth surface) of the fourth lens L4 or the N-th lens adjacent to the light guide LG protrudes toward the waveguide, the length of the outer lens LS can be reduced. That is, when the waveguide is placed toward the object side and the light source is placed toward the top, the TTL of the optical system can be reduced. Therefore, miniaturization of the optical system or the projection device can be easily achieved.

[0316] In addition, the contents shown in the following Table 1 can be applied to each component of the optical system according to the embodiment.

[0317] [Table 1]

[0318]

[0319]

[0320]

[0321]

[0322]

[0323] Here, the left column of each lens discloses the content of the surface facing the waveguide, and the right column discloses the content of the surface facing the light source. In addition, with respect to the side lenses, the left column discloses the content of the surfaces F11, F21, F31 facing the light guide, and the right column discloses the content of the surfaces F12, F22, F32 facing the light source. In addition, the thickness of each lens corresponds to the left column. In addition, the interval between adjacent lenses corresponds to the right column. For example, the content of the first surface of the first lens is disclosed in the left column. In addition, the content of the second surface of the first lens is disclosed in the right column. In addition, the thickness of the first lens can be 1.452 mm, and the distance between the first lens and the second lens can be 0.103 mm. In addition, the units of thickness and length can be millimeters (mm). Fig.16 is a view showing an optical system of a projection device according to a second embodiment.

[0324] Reference Fig.16 , 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, the outer lens LS, the light guide LG, the side lens FL1, the optical element 233a and the light source 232a as described in the first embodiment. In addition, those described above may be equally applied except those described below.

[0325] However, in this embodiment, the light source may be one, and the optical system may include a first light source 232a. Correspondingly, the optical system may include a first optical element 233b and a first side lens FL1. Therefore, the description of the second optical element, the third optical element, the second side lens, the third side lens, the second light source, and the third light source may not be applicable to this embodiment.

[0326] In addition, in an embodiment, the light source includes only the first light source, and may include light sources having various colors or wavelength bands. The first light source may include an RGB light source, such as an RGB LED. Alternatively, the first light source may include a monochromatic light source (LED) that outputs any one color in RGB. Alternatively, the first light source may include a light source (LED) that outputs two colors in RGB.

[0327] Fig.17 is a view showing an optical system of a projection device according to a third embodiment.

[0328] Reference Fig.17 The projection device according to the third embodiment may include the optical system as described above. In the same manner, the optical system in this embodiment may include an aperture ST, an outer lens LS, a light guide LG, a side lens, an optical element, and a light source as described in the first embodiment or the second embodiment.

[0329] In particular, in the optical system according to this embodiment, there may be a plurality of (for example, three) light sources. In addition, there may be a plurality of optical elements and side lenses corresponding to the number of light sources. The description thereof may be applied in the same manner as described in the first embodiment described above.

[0330] In addition, the outer lens LS may include a plurality of lenses. At this time, the outer lens LS according to this embodiment may include a first lens L1, a second lens L2, and a third lens L3. The third lens L3, the second lens L2, and the first lens L1 may be sequentially arranged in the first direction (X-axis direction). For example, the first lens L1 may be arranged to be spaced apart from the light guide LG in the outer lens LS at the maximum. The third lens L3 may be arranged to be spaced apart from the light guide LG in the outer lens LS at the minimum. The second lens L2 may be arranged between the first lens L1 and the third lens L3.

[0331] Thus, first lens L1, second lens L2, and third lens L3 may at least partially overlap each other in the first direction.

[0332] In addition, the first surface S11 of the first lens L1 may be convex in the first direction. In addition, the second surface S12 may be concave in the first direction. In addition, the third surface S21 of the second lens L2 may be convex in the first direction. In addition, the fourth surface S22 may be convex or concave in the first direction. In addition, the fifth surface S31 of the third lens L3 may be concave in the first direction. In addition, the sixth surface S32 of the third lens L3 may be convex in the first direction.

[0333] In addition, the spacing distance between the first lens L1 and the second lens L2 may be greater than the spacing distance between the second lens L2 and the third lens L3. In addition, the spacing distance between the first lens L1 and the second lens L2 may be greater than the spacing distance between the third lens L3 and the light guide LG. In addition, the spacing distance between the third lens L3 and the light guide LG may be greater than the spacing distance between the second lens L2 and the third lens L3. In addition, the contents shown in Table 2 below may be applied to each component of the optical system according to the embodiment.

[0334] [Table 2]

[0335]

[0336]

[0337]

[0338]

[0339] Here, the left column of each lens discloses the content of the surface facing the waveguide, and the right column discloses the content of the surface facing the light source. In addition, with respect to the side lens, the left column discloses the content of the surface F11, F21, F31 facing the light guide, and the right column discloses the content of the surface F12, F22, F32 facing the light source. In addition, the thickness of each lens corresponds to the left column. In addition, the spacing between adjacent lenses corresponds to the right column. For example, the content of the first surface of the first lens is disclosed in the left column. In addition, the content of the second surface of the first lens is disclosed in the right column. In addition, for the light guide (side lens, optical element), the left column discloses the content of the surface facing the waveguide. For the light guide (side lens, optical element), the right column discloses the content of the surface facing each light source (for example, the second light source in the case of the second side lens). In addition, with respect to the thickness of the light guide (side lens, optical element), the left column means the thickness of the corresponding component (according to the length of the first direction or optical axis), and the right column means the spacing distance between the corresponding component and the component closest to the light source in the first direction. For example, the thickness of the first lens may be 1.199690555 mm, and the separation distance between the first lens and the second lens may be 0.460932583 mm. Fig.18is a conceptual diagram showing a projection device according to another embodiment, Fig.19 is a perspective view showing a projection device according to another embodiment, Fig. 20 is an exploded perspective view showing a projection device according to another embodiment, Fig.21 is along Fig.19 The view taken along line AA' in Fig.22a is a side view showing a lens barrel in a projection device according to an embodiment, Figure 22b is another side view showing the lens barrel in the projection device according to the embodiment, Fig.22c is a cross-sectional view showing a lens barrel in a projection device according to an embodiment, Fig.23a is a side view showing a lens barrel and a housing in a projection device according to an embodiment, Figure 23b is another side view showing the lens barrel and the housing in the projection device according to the embodiment, Fig.23c is a cross-sectional view showing a lens barrel and a housing in a projection device according to an embodiment, Fig.24a is a side view showing a lens barrel, a housing, and a light source assembly in a projection device according to an embodiment, Figure 24b is another side view showing a lens barrel, a housing, and a light source assembly in a projection device according to an embodiment, Fig.24c is a cross-sectional view showing a lens barrel, a housing, and a light source assembly in a projection device according to an embodiment, Fig.25 It is shown Fig.21 The enlarged view of part K1 in Fig.26a It is shown Fig.21 The enlarged view of part K2 in Figure 26b yes Fig.26a A modified example of Fig.26c yes Fig.26a Another modified example of , and Fig.26d yes Fig.26a Yet another modified example of .

[0340] Reference Figures 18 to 21 According to another embodiment, a projection device 200 includes a lens barrel 210, a lens L, and a first light guide LG1. In addition, the projection device 200 may include a light source device 220 and an optical signal generating unit 230 adjacent to the lens barrel 210, and the light source device 220 is located in an opening portion OP formed on a side surface of the lens barrel 210 or is combined with the opening portion OP. In addition, the projection device 200 may further include a cover CV and a substrate (including a connector, not shown) covering the lens barrel 210, the light source device 220, and the optical signal generating unit 230.

[0341] The lens L may be a plurality of lenses. For example, the lens L may include a plurality of lenses sequentially arranged from the top of the lens barrel 210. For example, the lens L may include a first lens L1 arranged first at the top, a second lens L2 arranged at the rear end of the first lens, and an Nth lens Ln arranged at the top last. Here, N is a natural number and may be 2 or greater. In addition, the Nth lens Ln among the plurality of lenses L may be positioned closest to the optical signal generating unit 230 located at the rear end of the lens barrel 210 or at the rear end of the plurality of lenses L.

[0342] In addition, in an embodiment according to the present invention, the first direction (X-axis direction) may correspond to the optical axis. In addition, the first direction (X-axis direction) may correspond to the direction in which the light emitted from the light source device 220 is reflected from the optical signal generating unit 230 and emitted to the above-mentioned display unit. In addition, the second direction (Y-axis direction) is a direction perpendicular to the first direction (Y-axis direction). In addition, the second direction (Y-axis direction) may correspond to the direction from the first light guide LG1 toward the opening OP. In addition, in the following description or the embodiment, the second direction (Y-axis direction) may correspond to the direction from the first light guide LG1 toward the second light guide LG2. The first light guide LG1 may be referred to as a first light guide unit or a first guide member. In addition, the second light guide LG2 may be referred to as a second light guide unit or a second guide member.

[0343] In addition, the lens barrel 210 may further include a hole corresponding to the opening OP. As an embodiment, the lens barrel 210 may include a lens barrel hole or an additional hole 210h. The additional hole 210h may be positioned to face the opening OP. Alternatively, the additional hole 210h may overlap with the opening OP in the second direction (Y-axis direction). Alternatively, the distance of the additional hole 210h from the Nth lens Ln in the first direction may be equal to the distance between the opening OP and the Nth lens Ln. Alternatively, the additional hole 210h may be located in an area corresponding to the position of the opening OP on the inner side surface of the lens barrel 210. By such a configuration, the joining member can be easily applied to the light source device 220 that is combined, inserted, fixed or connected to the opening OP through the additional hole 210h. Therefore, the coupling strength between the lens barrel 210 and the light source device 220 can be improved. Therefore, the projection device 200 according to the embodiment can have improved durability, durability or reliability. Alternatively, the optical test of the light source device 220 located at the opening OP can also be easily performed through the additional hole 210h. Alternatively, the discharge or injection of fluid (e.g., air) from the lens barrel 210 and the light source device 220 can be easily performed through the additional hole 210h. According to the embodiment, the presence of the additional hole 210h can be applied in various ways. For example, as described above, the additional hole 210h can be provided on the side surface of the lens barrel 210. Alternatively, considering durability, etc., the additional hole 210h may not be provided on the side surface of the lens barrel 210.

[0344] In addition, a plurality of lenses L may be positioned in the lens barrel 210. In addition, a first light guide LG1 may be positioned in the lens barrel 210.

[0345] In addition, the lens barrel 210 according to the embodiment may include an opening portion OP formed on the side surface. The shape of the opening portion OP may include various shapes, such as a circle, a polygon, etc. In addition, the opening portion OP may correspond to the position of the first light guide LG1.

[0346] As an embodiment, the opening OP may overlap the first light guide LG1 in a direction perpendicular to the optical axis. For example, the opening OP may overlap the first light guide LG1 in the second direction. With such a configuration, light emitted from the light source device 220 located on the side surface of the lens barrel 210 may easily enter the first light guide LG1.

[0347] In addition, the first light guide LG1 may be disposed between two lenses among the plurality of lenses. For example, the first light guide LG1 may be disposed between the first lens L1 and the N-th lens Ln. In addition, the first light guide LG1 may be located between the first lens L1 and the optical signal generating unit 230. In addition, the first light guide LG1 may be located between the first lens L1 and the second lens L2 or between the second lens L2 and the N-th lens Ln. Various positions of the first light guide LG1 will be described in various embodiments as described below.

[0348] In this embodiment, the first light guide LG1 may be located between the second lens L2 and the N-th lens Ln. Therefore, the N-th lens Ln may be located between the first light guide LG1 and the optical signal generating unit 230. By such a configuration, when the light reflected from the first light guide LG1 is provided to the optical signal generating unit 230, an appropriate optical path may be ensured. In addition, refraction may be performed on the reflected light. Therefore, miniaturization of the first light guide LG1 may be achieved.

[0349] The first light guide LG1 may include a first prism. The first prism may be a polarizing prism. Alternatively, the first prism may be a polarizing light splitting prism.

[0350] The first prism may reflect the first polarized light and transmit the second polarized light. For example, a portion of the light (first polarized light) provided from the light source device 220 or entering the first light guide LG1 may be reflected from the first light guide LG1 and provided to the optical signal generating unit 230. In addition, the other portion of the light (second polarized light) entering the first light guide LG1 may pass through the first light guide LG1 to be absorbed in the lens barrel 210.

[0351] In addition, light emitted from the light source device 220 may enter the first light guide LG1 through the opening portion OP. To this end, as described above, the opening portion OP may be provided in the region where the first light guide LG1 is located. For example, the incident surface of the first light guide LG1 may be positioned to face the opening portion OP. Alternatively, in the lens barrel 210, the position of the first light guide LG1 may be the same as the position of the first light guide LG1.

[0352] The light source device 220 including the light source 223 may generate (produce, provide) or emit light. The light source device 220 according to the embodiment may be located in or combined with the opening portion OP. That is, the light source device 220 may be connected to or combined with the lens barrel 210.

[0353] The light source device 220 may include a housing 222 having an opening 222 h , a second light guide LG2 disposed inside the housing 222 , and a light source 223 providing light to the second light guide LG2 .

[0354] In addition, the light source device 220 may include a light source assembly 221 disposed outside the light source device 220 to surround the housing 222 , a light source lens 224 adjacent to the light source 223 , and an intermediate lens 224 located inside the housing 222 .

[0355] The light source assembly 221 may be disposed at the outermost side of the light source device 220. When it is difficult to install the light source 223 inside the housing 222 or an additional lens (light source lens) needs to be installed, the light source assembly 221 may be located outside the housing 222. The light source assembly 221 may be a structure integrated with or separated from the housing 222.

[0356] The housing 222 may include an opening 222h. The housing 222 may be positioned adjacent to the opening OP of the lens barrel 210. For example, the opening 222h of the housing 222 may be positioned corresponding to the opening OP of the lens barrel 210. Therefore, the opening 222h of the housing 222 may overlap with the opening OP of the lens barrel 210 in the second direction (Y-axis direction).

[0357] The light source 223 may be located inside the housing 222 or the light source assembly 221. The light source 223 may emit light. For example, the light emitted from the light source 223 may enter the second light guide LG2 inside the housing 222. The second light guide LG2 may be located inside the housing 222. Therefore, the second light guide LG2 may transmit the light emitted from the light source 223 to the opening 222h or the first light guide LG1.

[0358] In addition, the light source 223 may be one or more. That is, the light source 223 in the light source device 220 may be single or plural. For example, the light source 223 may be plural and include a first light source 223a, a second light source 223b, and a third light source 223c. The first light source 223a to the third light source 223c may emit light in the same direction or in different directions. For example, the first light source 223a and the third light source 223c may be positioned to face each other. The first light source 223a and the third light source 223c may be positioned to overlap each other in the first direction (X-axis direction). In addition, the second light guide LG2 may be located between the first light source 223a and the third light source 223c. Therefore, the second light guide LG2 may overlap with the first light source 223a and the third light source 223c. In addition, the second light source 223b may be located between the first light source 223a and the third light source 223c. The first light source 223a to the third light source 223c may emit light toward the second light guide LG2. In addition, the second light source 223b may overlap the second light guide LG2 in the second direction. With such a configuration, the projection device 200 may have a compact light source device 220.

[0359] In addition, each of the first light source 223a, the second light source 223b and the third light source 223c can emit light of the same or different wavelength or color as the other light sources. For example, the first light source 223a, the second light source 223b and the third light source 223c can emit red light, green light and blue light.

[0360] The second light guide LG2 may include a second prism. The second prism may include, for example, an X-prism as a reflective member. As an embodiment, the second light guide LG2 or the second prism may be a structure combining at least two or more prisms.

[0361] In addition, the second prism may include at least two or more coated surfaces (reflective members or reflective sheets). One of these at least two or more coated surfaces may reflect light of a first wavelength and light of a second wavelength, and transmit light of a third wavelength. That is, the coated surface may reflect light of a predetermined wavelength band. Therefore, for each of the lights emitted from the plurality of light sources 223, light of a desired wavelength band may be reflected from the second light guide LG2. For example, the light passing through the second light guide LG2 may be provided to the first light guide LG1 or the intermediate lens MO.

[0362] The light source lens 224 may be positioned adjacent to the light source 223. For example, the light source lens 224 may be plural. The light source lens 224 may be located on a path of light emitted from each light source 223.

[0363] As an embodiment, the light source lens 224 may be located between the second light guide LG2 and the light source 223. In addition, the light source lens 224 may be plural. The light source lens 224 may be located between the second light guide LG2 and the light source 223 in plural. Alternatively, the light source lens 224 may be plural corresponding to each of the plurality of light sources 223.

[0364] For example, the light source lens 224 may include a first light source lens 224a, a second light source lens 224b, and a third light source lens 224c. The first light source lens 224a may be located between the first light source 223a and the second light guide LG2. The second light source lens 224b may be located between the second light source 223b and the second light guide LG2. The third light source lens 224c may be located between the third light source 223c and the second light guide LG2.

[0365] In addition, each of the first light source lens 224a, the second light source lens 224b, and the third light source lens 224c may be located in plural on each of the first light source 223a, the second light source 223b, and the third light source 223c. For example, any one of the plurality of first light source lenses 224a may be located on the first light source 223a and combined with the light source assembly 221. In addition, another one of the plurality of first light source lenses 224a may be located between any one of the first light source lenses 224a and the second light guide LG2 and combined with the housing 222.

[0366] In addition, the first light source lens 224a, the second light source lens 224b, and the third light source lens 224c may include a collimating lens or a collimator.

[0367] In addition, a substrate 225 connected to the light source 223 may be arranged in the light source assembly 221. The substrate 225 may be at least one corresponding to the light source 223. For example, the plurality of substrates 225 may include a first substrate 225a, a second substrate 225b, and a third substrate 225c. As described above, the plurality of substrates 225 may be one substrate as a whole, or may be a plurality corresponding to the number of light sources.

[0368] In addition, the substrate 225 can be electrically connected to the control unit or processor in the above-mentioned frame (or display unit). Therefore, the substrate 225 can include a connector for communicating with an external device or a connected device. In addition, the substrate 225 can be arranged outside the light source 223 to discharge the heat generated by the light source to the outside. Therefore, the reliability of the light source device 220 can be improved.

[0369] The middle lens MO may be located between the opening 222h and the second light guide LG2. In addition, the middle lens MO may be located between the first light guide LG1 and the second light guide LG2.

[0370] The intermediate lens MO may include a plurality of lenses. For example, it may include a first intermediate lens MO1 and a second intermediate lens MO2. However, as described below, light reflected from the second light guide LG2 may be directly provided to the first light guide LG1 without the intermediate lens MO.

[0371] The first intermediate lens MO1 may include a first surface MO1s1 adjacent to the first light guide LG1 and a second surface MO1s2 corresponding to the first surface MO1s1. Light emitted from the light source 223 may pass through the second light guide LG2 and sequentially pass through the second surface MO1s2 and the first surface MO1s1.

[0372] The second surface MO1s2 may protrude toward the second light guide LG2. Alternatively, the second surface MO1s2 may be concave toward the first light guide LG1. In addition, the first surface MO1s1 may protrude or concave toward the second light guide LG2. For example, the first intermediate lens MO1 may have a meniscus shape. In this way, since the second surface MO1s2 protrudes toward the second light guide LG2, light may be focused while passing through the intermediate lens MO. Therefore, the uniformity of light provided to the optical signal generating unit 230 may be improved. In other words, the light entering the optical signal generating unit 230 may be surface light. In addition, the uniformity of the surface light may be improved. Therefore, the accuracy or resolution of the image signal or image output to the display unit by the projection device 200 according to the embodiment may be improved.

[0373] The second middle lens MO2 may include a micro lens array (MLA).Therefore, uniformity or flattening of light passing through the second light guide LG2 may be partially performed.

[0374] Furthermore, the size of the second intermediate lens MO2 may be different from the size of the second light guide LG2. Furthermore, the size of the first intermediate lens MO1 may be different from the size of the second light guide LG2. For example, the second intermediate lens MO2 may be larger than the second light guide LG2.

[0375] In addition, the positions of the plurality of lenses L, the intermediate lens MO and the light source lens 224 may be maintained by a spacer SP. For example, a plurality of spacers SP adjacent to the plurality of lenses L may exist inside the lens barrel 210. In addition, a plurality of spacers SP adjacent to the intermediate lens MO and the light source lens 224 may be provided in the housing 222 or the light source assembly 221 of the light source device 220. As an embodiment, a plurality of spacers SP may be provided on the top or bottom of the above-mentioned lenses to fix or maintain the positions of the lenses.

[0376] The optical signal generating unit 230 may be located at a rear end of the lens barrel 210. The optical signal generating unit 230 may overlap the lens L in the optical axis or the first direction (X-axis direction).

[0377] The optical signal generating unit 230 may convert light that enters the first light guide LG1 , is reflected, and then passes through the Nth lens into an optical signal containing image information.

[0378] The optical signal generating unit 230 may reflect the light (first polarized light) reflected from the first light guide LG1. The optical signal generating unit 230 may generate an optical signal including image information. That is, the light reflected from the optical signal generating unit 230 may be light including image information.

[0379] The optical signal generating unit 230 may include liquid crystal on silicon (LCoS).

[0380] Liquid crystal on silicon may be a structure in which liquid crystal is filled between a silicon wafer (thin disk used as a semiconductor material) having a complementary metal oxide semiconductor (CMOS) array and an anti-reflective (AR) material coated with a transparent electrode (indium tin oxide, ITO).

[0381] In addition, when an alignment layer is formed on a wafer (silicon wafer), an initial liquid crystal alignment can be formed.

[0382] In addition, a reflective layer or a reflective electrode formed as an aluminum layer and having a high optical reflectivity may be located below the alignment layer. The reflective electrode may be located on a silicon wafer. In addition, a semiconductor array (CMOS array) may be formed on the silicon wafer. In addition, the transmission of data signals through the panel may be accomplished by a semiconductor array.

[0383] The optical signal generating unit 230 may reflect at least a portion of the incoming light according to the driving. In addition, the optical signal generating unit 230 may reflect the light entering from the surface light source through the pixel. In addition, the intensity of the reflected light may be adjusted according to the modulation degree. For example, the optical signal generating unit 230 may partially modulate the first polarized light into the second polarized light. Therefore, the light modulated into the second polarized light may be provided to the display unit (or waveguide) through the first light guide LG1 and the first lens L1.

[0384] That is, the optical signal generating unit 230 can modulate the delay of the modulated light (ie, polarized light). The optical signal generating unit 230 can perform the delay of the first polarized light in various ways. That is, the electric field can be formed by adjusting the voltage of each pixel (adjusting the voltage of the electrode). In addition, the degree of distortion of the liquid crystal can also be adjusted according to the adjusted voltage. For example, at the maximum voltage, the light reflected from the optical signal generating unit 230 can be completely reflected from the first light guide LG1. In addition, at the minimum voltage, all the light reflected from the optical signal generating unit 230 can pass through the second light guide LG1. However, it can operate in the opposite manner according to the electric field. In addition, when an intermediate voltage is applied, a portion of the light can pass through the first light guide LG1. That is, the intensity (e.g., brightness) of the light provided to the display unit can be intermediate.

[0385] In this way, the optical signal generated by the optical signal generating unit 230 may be transmitted to the first lens L1 through the Nth lens Ln and the first light guide LG1. In addition, at least a portion of the optical signal generated by the optical signal generating unit 230 may pass through the first lens L1 and enter the display unit.

[0386] In addition, a transparent element 240 may be further disposed between the optical signal generating unit 230 and the N-th lens Ln (or the first light guide). The transparent element 240 may be glass. The transparent element 240 may be combined with the lens barrel 210 or the cover CV. In addition, the transparent element 240 may be located on the optical signal generating unit 230. Therefore, foreign matter may be easily prevented from flowing into the optical signal generating unit 230. In addition, the size of the transparent element 240 may be the same as or different from that of the optical signal generating unit 230. In addition, the transparent element 240 may overlap at least a portion of the optical signal generating unit 230 in the optical axis direction or the first direction (X-axis direction).

[0387] More specific description Figures 22a to 22c In the projection device according to the embodiment, the lens barrel 210 may include the hole as described above, and further include an opening portion OP on the side surface. The hole extending in the first direction inside the lens barrel 210 may be exposed through the opening portion OP.

[0388] For example, the lens barrel 210 may be connected to the waveguide at one side of the hole extending in the first direction or positioned adjacent to the waveguide. In addition, the lens barrel 210 may be connected to the optical signal generating unit 230 at the other side of the hole extending in the first direction or positioned adjacent to the optical signal generating unit 230.

[0389] The first light guide LG1 may be located inside the lens barrel 210. The first light guide LG1 may partially overlap the opening OP in the second direction. The opening OP may at least partially overlap the first light guide LG1 in the second direction. In addition, the opening OP may be longer than the first light guide LG1 in the first direction.

[0390] In addition, the lens barrel 210 may include a lens barrel protrusion 210p adjacent to the opening OP and extending toward the outside. Or, the lens barrel 210 may include a lens barrel protrusion 210p protruding toward the outside. The lens barrel protrusion 210p may be symmetrically arranged relative to the opening OP. In addition, the lens barrel protrusion 210p may overlap in the first direction. Therefore, the coupling strength between the lens barrel 210, the housing and the light source assembly described below may be improved.

[0391] In addition, in the first area AR1 of the lens barrel 210, the length of the opening OP may be the longest in the second direction and the third direction. The first area AR1 may correspond to an area located at the top of the last lens in the lens barrel 210. The second area AR2 may be adjacent to the optical signal generating unit 230 below the first area AR1. In other words, the second area AR2 may be located between the first area AR1 and the optical signal generating unit 230.

[0392] As an embodiment, the second area AR2 may have a length d2 or a diameter in the second direction greater than the length d1 or the diameter in the second direction of the first area AR1. In addition, the second area AR2 may at least partially overlap the housing and the light source assembly in the first direction.

[0393] In addition, the above-mentioned barrel protrusion 210p may be located in the first area AR1. In addition, the first light guide LG1 may also be located in the first area AR1. In addition, the opening OP may also be located in the first area AR1.

[0394] In addition, the lens barrel 210 may include a protrusion unit 210PT protruding toward the outside. The protrusion unit 210PT may be located in the first area AR1. In addition, the protrusion unit 210PT may be located corresponding to the first light guide LG1 inside the lens barrel 210.

[0395] As an embodiment, the lens barrel 210 may include a groove or a trench in a portion of the inner surface through the protruding unit 210PT. That is, the protruding unit 210PT may correspond to the edge (side) or vertex positioning of the first light guide LG1 located inside the lens barrel 210. Alternatively, the protruding unit 210PT may have a shape corresponding to the shape of the hexahedral first light guide LG1. Therefore, the assembly performance between the first light guide and the lens barrel can be improved.

[0396] The protrusion unit 210PT may overlap the opening portion OP in the second direction.

[0397] In addition, the protrusion or the like may be located in a predetermined area of ​​the opening OP. In addition, a plurality of steps ST may be present on the inner surface OPIS of the opening OP. By means of the protrusion and the steps ST of the opening OP, the spacer may be easily positioned in the opening OP. In other words, the coupling strength between the spacer and the lens barrel may be improved.

[0398] In addition, the assembly performance between the light source device and the opening OP (or the lens barrel) can be improved.

[0399] More specifically, FIG. 23 to FIG. Fig.23c In the light source device 220 according to the embodiment, the housing 222 may include a housing protrusion 222P protruding toward the outside. The barrel protrusion 210p may protrude from the outer surface of the barrel 210 toward the light source device 220. That is, the barrel protrusion 210p may extend or protrude from the outer surface of the barrel 210 in the second direction.

[0400] In contrast, the housing protrusion 222p of the housing 222 may extend or protrude in the first direction from the housing 222. In other words, the housing protrusion 222p may extend in a direction perpendicular to the barrel protrusion 210p.

[0401] As described above, the light source device 220 may be combined with the lens barrel 210 on the side surface of the opening portion OP. The light source device 220 may include a light source, a housing 222, a light source assembly, and the like.

[0402] In addition, the opening 222h of the housing 222 may face the opening OP. For example, the opening 222h of the housing 222 may overlap with the opening OP in the second direction. In addition, the size of the opening 222h of the housing 222 may be different from the size of the opening OP. For example, the opening 222h of the housing 222 may be smaller than the opening OP. Therefore, the light reflected by the second light guide LG2 may be efficiently provided to the lens barrel.

[0403] The housing protrusion 222P may include a protrusion hole 222ph. The lens barrel protrusion 210p may at least partially penetrate the housing protrusion 222P. That is, the lens barrel protrusion 210p may be located inside the protrusion hole 222ph. By such a configuration, the coupling strength between the housing 222 and the lens barrel 210 may be improved.

[0404] In addition, the area of ​​the protruding hole 222ph can be exposed. For example, the housing protrusion 222P can include a protruding hole 222ph extending in the second direction. In addition, the area of ​​the housing protrusion 222P can be removed. That is, the housing protrusion 222P can also include an exposure groove. By exposing the groove, the protruding hole 222ph can be exposed. In addition, the protruding groove 222ph can be plural and overlap each other in the first direction. Therefore, when moving in the second direction, the housing 222 can be easily combined with the lens barrel 210 and the lens barrel protrusion 210p.

[0405] Furthermore, as described above, the second light guide LG2 may be located within the housing 222 .

[0406] In addition, the housing 222 may include at least one housing hole 222ha, 222hb, 222hc corresponding to the second light guide LG2. In an embodiment, the number of housing holes may also vary corresponding to the number of light sources. Hereinafter, description will be made assuming that the number of housing holes and the number of light sources are three, respectively.

[0407] The housing holes may include a first housing hole 222ha, a second housing hole 222hb, and a third housing hole 222hc. The first housing hole 222ha, the second housing hole 222hb, and the third housing hole 222hc may be positioned to correspond to each side of the second light guide LG2.

[0408] Furthermore, a lens may be positioned in each of the first housing hole 222ha, the second housing hole 222hb, and the third housing hole 222hc.

[0409] More specific description Figures 24a to 24c , the light source device 220 according to the embodiment may include the light source assembly 221 surrounding the housing 222 as described above.

[0410] In addition, the light source assembly 221 may include an assembly protrusion 221p disposed inside the protruding hole 222ph. The light source assembly 221 may surround the outside of the housing 222 and include an assembly protrusion 221p extending into the protruding hole 222ph of the housing 222. The assembly protrusion 221p may extend along the second direction. For example, the assembly protrusion 221p may at least partially penetrate the protruding hole 222ph. By such a configuration, the coupling strength between the light source assembly 221, the housing 222 and the lens barrel 210 may be improved. Alternatively, the coupling strength between the light source device 220 and the lens barrel 210 may be improved.

[0411] In addition, the component protrusion 221p can face the lens barrel protrusion 210p. That is, the component protrusion 221p can overlap with the lens barrel protrusion 210p in the second direction. In addition, the component protrusion 221p can overlap with the area exposed from the protruding hole 222ph in the first direction. That is, the component protrusion 221p can be located in the area exposed from the protruding hole 222ph. Therefore, the light source assembly 221 can be easily assembled with the housing 222 and the lens barrel 210, and the coupling strength with the housing and the lens barrel can also be improved.

[0412] In addition, the assembly protrusion 221p may be a plurality corresponding to the barrel protrusion 210p, and the plurality of assembly protrusions 221p may overlap each other in the first direction. Therefore, since they have uniform coupling strength, the reliability of the projection device or the light source assembly can be improved.

[0413] In addition, the housing 222 may include at least one housing hole corresponding to the second light guide LG2. As described above, the housing hole may include a first housing hole 222ha, a second housing hole 222hb, and a third housing hole 222hc.

[0414] Correspondingly, the light source assembly 221 may include at least one assembling hole corresponding to the second light guide LG2 or the housing hole.

[0415] The assembly holes may be plural, for example, the assembly holes may include a first assembly hole 221ha, a second assembly hole 221hb, and a third assembly hole 221hc.

[0416] The first assembly hole 221ha, the second assembly hole 221hb and the third assembly hole 221hc may correspond to each side of the second light guide LG2. In addition, the first assembly hole 221ha, the second assembly hole 221hb and the third assembly hole 221hc may be positioned corresponding to the first housing hole 222ha, the second housing hole 222hb and the third housing hole 222hc, respectively.

[0417] For example, the first assembly hole 221ha, the second assembly hole 221hb, and the third assembly hole 221hc may be positioned to face the first housing hole 222ha, the second housing hole 222hb, and the third housing hole 222hc, respectively.

[0418] In addition, the first housing hole 222ha, the third housing hole 222hc, the first assembly hole 221ha, and the third assembly hole 221hc may at least partially overlap in the first direction or toward the optical axis. In addition, the second housing hole 222hb and the second assembly hole 221hb may at least partially overlap in the second direction. In addition, the second housing hole 222hb and the second assembly hole 221hb may also overlap with the opening OP and the opening 222h of the housing 222 in the second direction.

[0419] In addition, at least one assembly hole may be connected to another assembly hole. For example, the first assembly hole 221ha, the second assembly hole 221hb, and the third assembly hole 221hc may be connected to each other in at least one region.

[0420] More specifically, the assembly hole (first assembly hole to third assembly hole) may be composed of a plurality of holes according to the position. For example, the assembly hole may include a first hole 221gv3, a second hole 221gv2 disposed outside the first hole 221gv3, and a third hole 221gv1 disposed outside the second hole 221gv2. That is, each of the first assembly hole to the third assembly hole may include the first hole 221gv3 to the third hole 221gv1. At this time, the third holes 221gv1 disposed in the assembly hole may be connected to each other.

[0421] For example, the first hole 221gv3 may be positioned adjacent to the second light guide LG2 or the housing 222 compared to the second and third holes. Alternatively, the first hole 221gv3 may be positioned closest to the second light guide LG2 or the housing 222 compared to the second and third holes.

[0422] In addition, the size of the third hole 221gv1 may be larger than the size of the second hole 221gv2 and the first hole 221gv3. For example, the area of ​​the third hole 221gv1 may be larger than the area of ​​at least one of the second hole 221gv2 and the first hole 221gv3.

[0423] Therefore, the lens can be easily installed in the first hole 221gv3. In addition, the light source can be located in the second hole 221gv2, and the substrate 225 can be located in the third hole 221gv1. That is, the assembly performance between the light source assembly 221 and other components (lens, light source, substrate) can be improved.

[0424] In addition, the substrate can be easily placed in the third hole 221gv1 located at the outermost side of the assembly hole of the light source assembly 221. That is, the coupling strength between the substrate and the light source assembly can be improved. In addition, a plurality of third holes 221gv1 can be connected as one. To this end, the substrate can have flexibility in one area. For example, the substrate may include a flexible printed circuit board (FPCB), a rigid printed circuit board (RPCB), and a flexible-rigid printed circuit board (FRPCB).

[0425] In addition, the substrate may be configured as a flexible printed circuit board in a curved region. In addition, since the substrate is arranged inside the integrally configured third hole 221gv1, the heat generated by the light source may be easily discharged to the outside through the substrate. Therefore, the reliability of the light source device or the projection device may be improved.

[0426] In addition, the light source assembly 221 may include a step unit 222ST formed in an area adjacent to the second area AR2. That is, the size of the lens barrel may vary corresponding to the size of the lens (Nth lens) Ln disposed between the first light guide and the optical signal generating unit 230 of the lens barrel. At this time, since the light source assembly 221 has a step unit 222ST corresponding to the change in size, the assembly performance between the light source assembly and the lens barrel can be improved. For example, the step unit 222ST may be located in an area of ​​the light source assembly 221 adjacent to the lens barrel 210 and overlapping with the second area AR2 in the first direction.

[0427] More specific description Fig.25 a, the light La, Lb, Lc emitted from each light source 223 of the light source device 220 may pass through the light source lens 224, the second light guide LG2, and the intermediate lens MO. For example, the first light La, the second light Lb, and the third light Lc emitted from the first light source 223a to the third light source 223b may be emitted in the second light guide LG2 in the same direction.

[0428] For example, the second light guide LG2 may include a first coated surface LG2a and a second coated surface LG2b. As described above, one of the at least two coated surfaces may reflect some of the first wavelength, the second wavelength, and the third wavelength. For example, the first wavelength includes a wavelength band of red light. The second wavelength includes a wavelength band of green light. The third wavelength includes a wavelength band of blue light.

[0429] In addition, the first coated surface LG2a may reflect the first light La or the light of the first wavelength. That is, the first coated surface LG2a may transmit the second light Lb and the third light Lc. In other words, the first coated surface LG2a may transmit the light of the second wavelength and the light of the third wavelength.

[0430] The second coated surface LG2b may reflect the second light Lb or the light of the second wavelength. That is, the second coated surface LG2b may transmit the first light La and the third light Lc. In other words, the second coated surface LG2b may transmit the light of the first wavelength and the light of the third wavelength.

[0431] Therefore, in the second light guide LG2, the first light La can be reflected from the intermediate lens MO or the opening OP or enter the intermediate lens MO or the opening OP. In addition, in the second light guide LG2, the second light Lb can be reflected from the intermediate lens MO or the opening OP or enter the intermediate lens MO or the opening OP. In addition, in the second light guide LG2, the third light Lc can be reflected from the intermediate lens MO or the opening OP or enter the intermediate lens MO or the opening OP.

[0432] Therefore, the light IL or La, Lb, Lc emitted from the light source 223 may enter the first light guide LG. At this time, the light entering the first light guide LG may be the first incident light IL.

[0433] More specific description Fig.26a , the first incident light IL may be partially reflected and partially transmitted in the first light guide LG1. That is, the first light guide LG1 may reflect the first polarized light ILa of the first incident light IL and transmit the second polarized light ILb. For example, each of the first polarized light ILa and the second polarized light ILb may be one of S / P lights different from each other. Therefore, the first polarized light ILa as a part of the first incident light IL may be provided to the optical signal generating unit 230 via the Nth lens Ln. In addition, the second polarized light ILb may be absorbed by the lens barrel 210 or provided to the additional aperture 210h.

[0434] More specific description Figure 26b , the optical signal generating unit 230 may reflect the first polarized light ILa by controlling the voltage as described above. In an embodiment, the first polarized light ILa reflected from the optical signal generating unit 230 is described below as reflected polarized light.

[0435] In this way, the first light guide LG1 may reflect at least a portion of the light IL emitted from the light source 223 and entering the first light guide to the Nth lens (or the optical signal generating unit). That is, the reflected polarized light may be at least partially reflected from the first light guide LG1. However, as described above, all of the reflected polarized light may be reflected or transmitted in the first light guide LG1 according to the voltage applied by the optical signal generating unit 230. Hereinafter, the description will be made under the assumption that the reflected polarized light is at least partially transmitted in the first light guide LG1.

[0436] The reflected polarized light may include first reflected polarized light ILaa passing through the first light guide LG1 and second reflected polarized light ILab reflected from the first light guide LG1. As described above, the intensity of the first reflected polarized light ILaa, ie, the transmittance of the reflected polarized light, may be adjusted corresponding to the image provided to the display unit.

[0437] In addition, the projection device 200 according to the embodiment may further include a display unit disposed in front of the first lens L1 to display an optical signal including image information transmitted to the first lens L1 as an image. In other words, the projection device 200 may be a structure integrated with the above-mentioned display unit. However, the description will be made under the assumption that the projection device 200 is a structure separated from the display unit.

[0438] Furthermore, as an example of modification, Figure 26bAs shown, the lens barrel 210 may further include an additional hole 210h on the side surface. For example, the second polarized light may be provided to the additional hole 210h. The description of other embodiments described above may be equally applied to the description of the modified example.

[0439] describe Fig.26c According to another modified example, the positions between the plurality of lenses in the lens barrel 210 and the first light guide LG1 may be different. The contents described in each embodiment of the present specification may be applied except for the contents described below.

[0440] In this example, the second lens L2 may be disposed between the first lens L1 and the N-th lens Ln among the plurality of lenses L. In addition, the second lens L2 may be disposed between the first light guide LG1 and the N-th lens Ln.

[0441] At least a portion of the optical signal generated by the optical signal generating unit 230 may pass through the second lens L2 before passing through or being reflected by the first light guide LG1. That is, for example, a portion of the reflected polarized light may pass through the second lens L2 before the first light guide LG1.

[0442] More specific description Fig.26d , unlike the projection apparatus in other embodiments, according to yet another modified example, the positions between the plurality of lenses in the barrel 210 and the first light guide LG1 may be different. The contents described in each embodiment of this specification may be applied except for the contents described below.

[0443] In addition, in the projection device according to still another modified example, there may be no intermediate lens MO between the first light guide LG1 and the second light guide LG2. Therefore, it is possible to prevent a decrease in light efficiency due to absorption of a portion of light or the like.

[0444] In addition, at least one of the first intermediate lens and the second intermediate lens may not exist. For example, only the second intermediate lens (or the first intermediate lens) may exist between the first light guide LG1 and the second light guide LG2.

[0445] In addition, the projection device may further include a third light guide additionally disposed between the first light guide and the second light guide. The third light guide may include a prism, etc. The third light guide may change the path of light. Therefore, the optical path may be easily changed corresponding to the shape of the projection device.

[0446] In addition, the projection device can provide the above-mentioned image signal through one light source without the need for a second light guide. That is, only one light source can be provided to the display unit through one light source. For example, in the case of providing only information to the user, the light source device can have only one light source.

[0447] In addition, the light source may emit two kinds of light. For example, the two kinds of light may be two of red, green and blue. Alternatively, the light may include white light.

Claims

1. A projection device, comprising: Light guide; a first light source disposed at a first side of the light guide; a lens group arranged at a fourth side of the light guide; as well as a first side lens arranged between the first side of the light guide and the first light source, wherein The first side of the light guide overlaps the fourth side of the light guide in the optical axis direction of the lens group, and the first side lens contacts the light guide.

2. The projection device according to claim 1, wherein: 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, a side of the first lens opposite to a side facing the fourth side being convex, the Nth lens is arranged closest to the light guide, a side of the Nth lens facing the fourth side of the light guide is concave, A side of the first side lens adjacent to the first light source is convex, The optical power of the first lens is positive. The optical power of the Nth lens is negative, and The composite optical power of the lens between the first lens and the Nth lens is positive or negative.

3. The projection device according to claim 1, comprising: 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 a second side of the light guide and the second light source; as well as a third side lens arranged between a third side of the light guide and the third light source, wherein A side of the second side lens adjacent to the second light source is convex, a side of the third side lens adjacent to the third light source is convex, and the second side of the light guide is arranged to face the third side of the light guide, wherein the light guide is interposed between the second side of the light guide and the third side of the light guide.

4. The projection device according to claim 1, wherein: The first side lens is in contact with the light guide, and a radius of curvature of the first side lens on an optical axis on a side adjacent to the light guide is 100 mm or more.

5. The projection device according to claim 1, wherein: The light guide and the first side lens are in contact with each other through an adhesive.

6. The projection device according to claim 1, wherein: A side surface of the light guide is larger than or equal to a side of the first side lens adjacent to the light guide.

7. The projection device according to claim 1, wherein: A side of the first side lens adjacent to the light guide is a flat surface.

8. A projection device, comprising: N lenses and a first light source; a light guide disposed between the N lenses and the first light source; a first side lens arranged between the light guide and the first light source, wherein Among the N lenses, a side of a first lens arranged farthest from the light guide opposite to a side facing the light guide is convex, and a side of an Nth lens arranged closest to the light guide facing the light guide is concave.

9. The projection device according to claim 8, wherein: The effective diameter of the first lens among the N lenses is the largest, the effective diameter of the N-th lens among the N lenses is the smallest, and the effective diameter of the lens arranged between the first lens and the N-th lens is smaller than the effective diameter of the first lens and larger than the effective diameter of the N-th lens.

10. The projection device according to claim 8, wherein: The first light source is an RGB LED or a single-color LED which is one of RGB.

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