Wearable electronic device comprising lens assembly

Abstract

According to one embodiment of the present disclosure, the wearable electronic device may comprise a lens assembly for focusing or guiding, on or to both eyes of a user, visual information that is output from a display. In one embodiment, the lens assembly can include: at least four lenses sequentially arranged in the direction toward the display along an optical axis; a first polarizing plate disposed on a user eye-side surface of one (hereinafter, referred to as "n-th lens") of the at least four lenses; a beam splitter disposed on a display-side surface of the n-th lens; and a second polarizing plate disposed on an eye-side surface of a user of an (n+1)-th lens disposed between the n-th lens and the display while being adjacent to the n-th lens from among the at least four lenses. In one embodiment, the first polarizing plate can reflect at least some of the visual information that is output from the display, and the beam splitter can reflect at least some of the visual information reflected by the first polarizing plate. Other various embodiments are also possible.

Description

Wearable electronic device comprising a lens assembly

[0001] Embodiments of the present disclosure relate to electronic devices, for example, wearable electronic devices including a lens assembly.

[0002] Portable electronic devices, such as electronic notebooks, portable multimedia players, mobile communication terminals, and tablet PCs, typically feature display elements (e.g., display modules) and batteries, and have typically had bar-shaped, folder-shaped, or sliding-type appearances due to the shape of the display elements or batteries. Recently, as the performance of display elements and batteries has improved, they have become smaller, leading to the emergence of electronic devices that can be worn on parts of the body, such as the wrist or head, or in the form of clothing (hereinafter referred to as "wearable electronic devices").

[0003] Examples of wearable electronic devices include head-mounted devices (HMDs), smart glasses, smart watches (or bands), contact lens-type devices, ring-type devices, and clothing / shoe / glove-type devices. These body-worn electronic devices are easy to carry and can improve user accessibility.

[0004] For example, a head-mounted wearable device is a device worn on the user's head or face that projects an image onto the user's retina, allowing the user to view virtual images in three-dimensional space. For example, head-mounted wearable devices can be categorized into see-through types that provide augmented reality (AR) and see-closed types that provide virtual reality (VR). A see-through type head-mounted wearable device can be implemented in the form of glasses, for example, and can provide the user with information such as buildings and objects in the space within the user's field of vision in the form of images or text. A see-closed type head-mounted wearable device can output independent images to both eyes of the user, and can provide the user, or one person, with an excellent sense of immersion by outputting content (games, movies, streaming, broadcasts, etc.) provided by a mobile communication terminal or an external input in the form of images or audio. Additionally, head-mounted wearable devices may be used to provide mixed reality (MR) or extended reality (XR), which are a combination of augmented reality (AR) and virtual reality (VR).

[0005] Recently, product development for head-mounted wearable devices has been actively underway, and they are being used for a variety of purposes, including military, gaming, industrial, and medical applications. Consequently, there is a growing demand for smaller, lighter devices while also providing superior image quality.

[0006] The above information may be provided as background art to aid in understanding the present disclosure. No claim or determination is made as to whether any of the above is applicable as prior art in connection with the present disclosure.

[0007] According to one embodiment of the present disclosure, a wearable electronic device may include a display configured to output visual information, and a lens assembly configured to focus or guide the visual information output from the display. In one embodiment, the lens assembly may include at least four lenses sequentially arranged in a direction toward the display along an optical axis, a first polarizing plate disposed on a user eye-side surface of one of the at least four lenses (hereinafter, referred to as an 'n-th lens'), a beam splitter disposed on a display-side surface of the n-th lens, and a second polarizing plate disposed on a user eye-side surface of an (n+1)-th lens disposed between the n-th lens and a display and adjacent to the n-th lens among the at least four lenses. In one embodiment, the first polarizing plate may be configured to reflect at least a portion of the visual information output from the display, and the beam splitter may be configured to reflect at least a portion of the visual information reflected by the first polarizing plate.

[0008] According to one embodiment of the present disclosure, a wearable electronic device may include a display configured to output visual information, and a lens assembly configured to focus or guide visual information output from the display. In one embodiment, the lens assembly may include at least four lenses sequentially arranged in a direction toward the display along an optical axis, a first polarizing plate disposed on a user's eye-side surface of one of the at least four lenses (hereinafter, referred to as an 'n-th lens') and including a reflective polarizer and a first 1 / 4 wave plate disposed between the reflective polarizer and the n-th lens, a beam splitter disposed on a display-side surface of the n-th lens, and a second polarizing plate disposed on a user's eye-side surface of an (n+1)-th lens of the at least four lenses adjacent to the n-th lens and disposed between the n-th lens and a display, and including a second 1 / 4 wave plate and a second polarizer disposed between the second 1 / 4 wave plate and the n+1 lens. In one embodiment, the nth lens has positive refractive power, the n+1th lens has negative refractive power, and among the at least four lenses, a lens disposed between the n+1th lens and the display and closest to the display may have positive refractive power.

[0009] The above-described aspects or other aspects, configurations and / or advantages of one embodiment of the present disclosure may be further clarified by the following detailed description taken in conjunction with the accompanying drawings.

[0010] FIG. 1 is a block diagram illustrating an electronic device within a network environment according to one embodiment of the present disclosure.

[0011] FIG. 2 is a diagram illustrating a wearable electronic device according to one embodiment of the present disclosure.

[0012] FIGS. 3 and 4 are drawings showing the front and back of a wearable electronic device according to one embodiment of the present disclosure.

[0013] FIG. 5 illustrates a path along which light output by a display is focused or guided to a user's eye in a wearable electronic device according to one embodiment of the present disclosure.

[0014] FIG. 6 is a diagram illustrating a wearable electronic device and / or lens assembly according to one embodiment of the present disclosure.

[0015] FIG. 7 is an enlarged view of part A of FIG. 6 according to one embodiment of the present disclosure.

[0016] FIG. 8 is a drawing illustrating a wearable electronic device and / or lens assembly according to one embodiment of the present disclosure.

[0017] FIG. 9 is an enlarged view of part B of FIG. 8 according to one embodiment of the present disclosure.

[0018] Throughout the attached drawings, similar reference numbers may be assigned to similar parts, components and / or structures.

[0019] Wearable electronic devices that implement augmented reality, virtual reality, mixed reality, and / or extended reality can generally be used while worn on the user's head or face. For example, a display that outputs visual information may be positioned at a relatively close distance from the user's eyes. When the display and the user's eyes are positioned at a relatively close distance, it may be difficult to configure an optical system that guides or focuses the visual information to the user's eyes. For example, the size or number of lenses may be limited to reduce the size or weight of the wearable electronic device, and it may be difficult to implement an optical system that can provide good image quality with a limited number of lenses. In one embodiment, in a usage environment where the display and the user's eyes are positioned at a relatively close distance, an optical system with a pancake lens structure may be useful for providing good image quality while using a limited number of lenses. The optical system with a pancake lens structure can implement an optical path that is sufficiently long compared to the mechanical length (e.g., the total length of the lens) by reflecting the visual information output by the display at least twice on the path to the user's eyes. Pancake lens structures can provide excellent image quality while miniaturizing. However, the repeated reflection structure can increase light refraction and scattering. For example, increased refraction and scattering can lead to image quality degradation due to interference between refracted and scattered light.

[0020] One embodiment of the present disclosure is intended to at least resolve the above-described problems and / or disadvantages and at least provide the advantages described below, thereby providing a wearable electronic device including a lens assembly that is easy to control aberrations and thus realizes good image quality.

[0021] One embodiment of the present disclosure can provide a wearable electronic device including a miniaturized and / or lightweight lens assembly while providing good image quality.

[0022] One embodiment of the present disclosure can provide a wearable electronic device that can reduce user fatigue when worn by being miniaturized and / or lightweight.

[0023] The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present disclosure belongs from the description below.

[0024] The following description of the accompanying drawings may provide an understanding of various exemplary implementations of the present disclosure, including the claims and their equivalents. While the exemplary embodiments disclosed in the following description include numerous specific details to aid understanding, they are to be considered as one example of various exemplary embodiments. Accordingly, those skilled in the art will appreciate that various modifications and variations of the various implementations described herein may be made without departing from the scope and spirit of the disclosure. Furthermore, descriptions of well-known functions and configurations may be omitted for clarity and conciseness.

[0025] The terms and words used in the following description and claims are not limited to their reference meanings and can be used to clearly and consistently describe one embodiment of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various implementations of the disclosure is provided for illustrative purposes, not for the purpose of limiting the scope of the disclosure and its equivalents.

[0026] Unless the context clearly dictates otherwise, the singular forms of "a," "an," and "the" should be understood to include plural meanings. Thus, for example, "a component surface" could be understood to include one or more of the surfaces of the component.

[0027] FIG. 1 is a block diagram of an electronic device (101) within a network environment (100) according to one embodiment of the present disclosure. Referring to FIG. 1 , in the network environment (100), the electronic device (101) may communicate with the electronic device (102) via a first network (198) (e.g., a short-range wireless communication network), or may communicate with at least one of the electronic device (104) or the server (108) via a second network (199) (e.g., a long-range wireless communication network). In one embodiment, the electronic device (101) may communicate with the electronic device (104) via the server (108). According to one embodiment, the electronic device (101) may include a processor (120), a memory (130), an input module (150), an audio output module (155), a display module (160), an audio module (170), a sensor module (176), an interface (177), a connection terminal (178), a haptic module (179), a camera module (180), a power management module (188), a battery (189), a communication module (190), a subscriber identification module (196), or an antenna module (197). In one embodiment, the electronic device (101) may have at least one of these components (e.g., the connection terminal (178)) omitted, or one or more other components added. In one embodiment, some of these components (e.g., the sensor module (176), the camera module (180), or the antenna module (197)) may be integrated into one component (e.g., the display module (160)).

[0028] The processor (120) may, for example, execute software (e.g., a program (140)) to control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) and perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (120) may store commands or data received from other components (e.g., a sensor module (176) or a communication module (190)) in a volatile memory (132), process the commands or data stored in the volatile memory (132), and store result data in a non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., a central processing unit or an application processor), or an auxiliary processor (123) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor) that can operate independently or together with the main processor (121). For example, when the electronic device (101) includes the main processor (121) and the auxiliary processor (123), the auxiliary processor (123) may be configured to use less power than the main processor (121) or to be specialized for a given function. The auxiliary processor (123) may be implemented separately from the main processor (121) or as a part thereof.

[0029] The auxiliary processor (123) may control at least a portion of functions or states associated with at least one component (e.g., a display module (160), a sensor module (176), or a communication module (190)) of the electronic device (101), for example, on behalf of the main processor (121) while the main processor (121) is in an inactive (e.g., sleep) state, or together with the main processor (121) while the main processor (121) is in an active (e.g., application execution) state. In one embodiment, the auxiliary processor (123) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (180) or a communication module (190)). In one embodiment, the auxiliary processor (123) (e.g., a neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. The artificial intelligence models may be generated through machine learning. This learning can be performed, for example, on the electronic device (101) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (108)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0030] The memory (130) can store various data used by at least one component (e.g., processor (120) or sensor module (176)) of the electronic device (101). The data can include, for example, software (e.g., program (140)) and input data or output data for commands related thereto. The memory (130) can include volatile memory (132) or non-volatile memory (134).

[0031] The program (140) may be stored as software in the memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0032] The input module (150) can receive commands or data to be used in a component of the electronic device (101) (e.g., a processor (120)) from an external source (e.g., a user) of the electronic device (101). The input module (150) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0033] The audio output module (155) can output audio signals to the outside of the electronic device (101). The audio output module (155) can include, for example, a speaker or a receiver. The speaker can be used for general purposes, such as multimedia playback or recording playback. The receiver can be used to receive incoming calls. In one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0034] The display module (160) can visually provide information to an external party (e.g., a user) of the electronic device (101). The display module (160) may include, for example, a display, a holographic device, or a projector and a control circuit for controlling the device. According to one embodiment, the display module (160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0035] The audio module (170) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150), output sound through the sound output module (155), or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (101).

[0036] The sensor module (176) can detect the operating status (e.g., power or temperature) of the electronic device (101) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. According to one embodiment, the sensor module (176) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0037] The interface (177) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (101) to an external electronic device (e.g., the electronic device (102)). In one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

[0038] The connection terminal (178) may include a connector through which the electronic device (101) may be physically connected to an external electronic device (e.g., electronic device (102)). According to one embodiment, the connection terminal (178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0039] The haptic module (179) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. According to one embodiment, the haptic module (179) can include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0040] The camera module (180) can capture still images and moving images. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0041] The power management module (188) can manage power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0042] A battery (189) may power at least one component of the electronic device (101). In one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0043] The communication module (190) may support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (101) and an external electronic device (e.g., electronic device (102), electronic device (104), or server (108)), and the performance of communication through the established communication channel. The communication module (190) may operate independently from the processor (120) (e.g., application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (190) may include a wireless communication module (192) (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (194) (e.g., a local area network (LAN) communication module, or a power line communication module). Among these communication modules, the corresponding communication module can communicate with an external electronic device via a first network (198) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (199) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (192) can verify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) by using subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (196).

[0044] The wireless communication module (192) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (192) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (192) can support various technologies for securing performance in a high-frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (192) can support various requirements specified in the electronic device (101), an external electronic device (e.g., the electronic device (104)), or a network system (e.g., the second network (199)). According to one embodiment, the wireless communication module (192) can support a peak data rate (e.g., 20 Gbps or more) for eMBB realization, a loss coverage (e.g., 164 dB or less) for mMTC realization, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for URLLC realization.

[0045] The antenna module (197) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). In one embodiment, the antenna module may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). In one embodiment, the antenna module (197) may include a plurality of antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (198) or the second network (199), may be selected from the plurality of antennas, for example, by the communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device via the at least one selected antenna. In one embodiment, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (197).

[0046] In one embodiment, the antenna module (197) may form a mmWave antenna module. In one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side) of the printed circuit board and capable of transmitting or receiving signals in the designated high-frequency band.

[0047] At least some of the above components can be interconnected and exchange signals (e.g., commands or data) with each other via a communication method between peripheral devices (e.g., a bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)).

[0048] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) via a server (108) connected to a second network (199). Each of the external electronic devices (102 or 104) may be the same or a different type of device as the electronic device (101). According to one embodiment, all or part of the operations executed in the electronic device (101) may be executed in one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) may, instead of or in addition to executing the function or service itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101). The electronic device (101) may process the result as is or additionally and provide it as at least a portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (101) may provide an ultra-low latency service by using distributed computing or mobile edge computing, for example. In one embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server utilizing machine learning and / or a neural network. According to one embodiment, the external electronic device (104) or the server (108) may be included in the second network (199).The electronic device (101) can be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0049] Electronic devices according to embodiments of the present disclosure may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to embodiments of the present disclosure are not limited to the aforementioned devices.

[0050] The embodiments of the present disclosure and the terminology used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to encompass various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly dictates otherwise. In this document, phrases such as "A or B," "at least one of A and B," "at least one of A or B," "A, B, or C," "at least one of A, B, and C," and "at least one of A, B, or C" can each include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as "first," "second," or "first" or "second" may be used simply to distinguish the corresponding component from other corresponding components, and do not limit the corresponding components in any other respect (e.g., importance or order). When a component (e.g., a first component) is referred to as being “coupled” or “connected” to another component (e.g., a second component), with or without the terms “functionally” or “communicatively,” it is understood that the component can be connected to the other component directly (e.g., wired), wirelessly, or via a third component.

[0051] The term "module" used in the embodiments of the present disclosure may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integral component, or a minimum unit or part of such a component that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0052] Embodiments of the present disclosure may be implemented as software (e.g., a program) including one or more instructions stored in a storage medium (e.g., built-in memory or external memory) readable by a machine (e.g., an electronic device). For example, a processor (e.g., a processor) of the machine (e.g., an electronic device) may call at least one instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, "non-transitory" only means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic waves), and this term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily in the storage medium.

[0053] According to one embodiment, a method according to the embodiment(s) of the present disclosure may be provided as a computer program product. The computer program product may be traded between sellers and buyers as a product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read only memory (CD-ROM)) or may be provided through an application store (e.g., Play Store). TM ) or directly between two user devices (e.g., smartphones), online distribution (e.g., downloading or uploading). In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0054] According to one embodiment, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to one embodiment, one or more components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to one embodiment, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

[0055] FIG. 2 is a drawing showing a wearable electronic device (200) according to one embodiment of the present disclosure.

[0056] In describing one embodiment of the present disclosure, some numerical values ​​and the like may be presented, but it should be noted that such numerical values ​​do not limit one embodiment of the present disclosure unless stated in the claims.

[0057] Referring to FIG. 2, a wearable electronic device (200) (e.g., electronic device (101) of FIG. 1) is an electronic device that can be worn on a user's head or face, and the user can visually recognize surrounding objects or environments even while wearing the wearable electronic device (200). The wearable electronic device (200) uses a camera module to acquire and / or recognize visual images of objects or environments viewed by the user or in the direction in which the wearable electronic device (200) is directed, and can receive information about the objects or environments from an external electronic device via a network. The wearable electronic device (200) can provide the user with information about the objects or environments received in an acoustic or visual form. For example, the wearable electronic device (200) can provide the user with information about the objects or environments received in a visual form by using a display member such as a display module. By visualizing information about objects or the environment and combining it with actual images (or videos) of the user's surroundings, the wearable electronic device (200) can implement augmented reality (AR), virtual reality (VR), mixed reality (MR), and / or extended reality (XR). The display member can provide the user with information about objects or the environment around him / her by outputting a screen in which an augmented reality object is added to an actual image (or video) of the user's surroundings.

[0058] According to one embodiment, all or part of the operations executed by the electronic device (101) or the wearable electronic device (200) may be executed by one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) or the wearable electronic device (200) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) or the wearable electronic device (200) may, instead of executing the function or service by itself or in addition, request one or more of the external electronic devices (102, 104, or 108) to execute the function or at least a part of the service. The one or more external electronic devices that receive the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101) or the wearable electronic device (200). The electronic device (101) or the wearable electronic device (200) may process the result as is or additionally and provide it as at least a part of a response to the request. For example, the external electronic device (102) renders content data executed in an application and transmits it to the electronic device (101) or the wearable electronic device (200), and the electronic device (101) or the wearable electronic device (200) that receives the data may output the content data to a display module. When the electronic device (101) or the wearable electronic device (200) detects user movement through a sensor(s) such as an inertial measurement unit sensor, the processor (e.g., the processor (120) of FIG. 1) of the electronic device (101) or the wearable electronic device (200) may correct the rendering data received from the external electronic device (102) based on the movement information and output the corrected data to the display module.Or, when a user movement is detected through a sensor(s), a processor (e.g., processor (120) of FIG. 1) of the electronic device (101) or wearable electronic device (200) may transmit the movement information to an external electronic device (102) and request rendering so that screen data is updated accordingly. According to various embodiments, the external electronic device (102) may be a device of various forms, such as a case device capable of storing and charging the electronic device (101).

[0059] It should be noted that the detailed description below may refer to various things such as “a state or position in which an electronic device or a designated component of an electronic device faces the user’s face,” and this is based on the assumption that the user is wearing the wearable electronic device (200).

[0060] According to one embodiment, a wearable electronic device (200) may include at least one display member and a wearing member. Depending on the structure of the display member, the wearable electronic device (200) may further include a structure (e.g., a lens frame) for mounting or supporting the display member. The display members may be provided as a pair including a first display member and a second display member, and may be arranged to correspond to the right and left eyes of the user, respectively, when the wearable electronic device (200) is worn on the user's body. In one embodiment, the wearable electronic device (200) may also include a housing form (e.g., a goggle form) including one display member corresponding to the right eye and the left eye.

[0061] According to one embodiment, the display member is a configuration provided to provide visual information to a user, and may include, for example, a display (D), a plurality of lenses (L1, L2, L3, L4) (e.g., a lens assembly) and / or at least one sensor. Here, the lens assembly and the display (D) may each be formed transparently or translucently. However, the display member is not limited thereto. In one embodiment, the display member may include a window member, and the window member may be a translucent glass or a member whose light transmittance can be adjusted as a tinting density is adjusted. In one embodiment, the display member may include a lens including a waveguide or a reflective lens, and an image output from an optical output device (e.g., a projector or the display (D)) is formed on each lens to provide visual information to the user. For example, the display member may include a waveguide (e.g., a light waveguide) in at least a portion of each lens, and may mean a display that transmits an image (or light) output from an optical output device, such as a display (D), to the user's eyes through the waveguide included in the display member, and at the same time transmits the real world to the user's eyes through that area in a see-through manner. In one embodiment, the waveguide may be understood as a part of a lens assembly. The lens assembly (e.g., the lens assembly (LA) of FIG. 6 or FIG. 8) is a configuration including a plurality of lenses (e.g., L1, L2, L3, L4), and may be arranged in a state aligned with an optical axis (e.g., the optical axis (O) of FIG. 6 or FIG. 8) in a space within the wearable electronic device (200). A configuration in which visual information output from the display (D) is provided to the user's eyes through the lens assembly will be discussed again below with reference to FIG. 5.

[0062] FIGS. 3 and 4 are drawings showing the front and back of a wearable electronic device (300) according to one embodiment.

[0063] Referring to FIGS. 3 and 4, in one embodiment, camera modules (311, 312, 313, 314, 315, 316) and / or depth sensors (317) for obtaining information related to the surrounding environment of the wearable electronic device (300) may be arranged on a first surface (310) of the electronic device (300) (e.g., housing).

[0064] In one embodiment, the camera modules (311, 312) can acquire images related to the environment surrounding the wearable electronic device.

[0065] In one embodiment, the camera modules (313, 314, 315, 316) can acquire images while the wearable electronic device is worn by a user. The camera modules (313, 314, 315, 316) can be used for hand detection, tracking, and recognition of user gestures (e.g., hand movements). The camera modules (313, 314, 315, 316) can be used for 3DoF (degrees of freedom), 6DoF head tracking, position (spatial, environmental) recognition, and / or movement recognition. In one embodiment, the camera modules (311, 312) can also be used for hand detection and tracking or recognition or detection of user gestures.

[0066] In one embodiment, the depth sensor (317) may be configured to transmit a signal and receive a signal reflected from a subject, and may be used for purposes such as time of flight (TOF) to determine the distance to an object. Instead of or in addition to the depth sensor (317), camera modules (313, 314, 315, 316) may determine the distance to an object.

[0067] According to one embodiment, a camera module (325, 326) for facial recognition and / or a display (331) (and / or a lens) may be disposed on the second side (320) of the housing.

[0068] In one embodiment, a face recognition camera module (325, 326) adjacent to the display may be used to recognize a user's face, or may recognize and / or track both eyes of the user.

[0069] In one embodiment, the display (331) (and / or lens) may be disposed on the second side (320) of the wearable electronic device (300). In one embodiment, the display (331) (and / or lens) may be at least partially similar to, or substantially identical to, the display (D) (and / or lenses L1, L2, L3, L4) of FIG. 2. In one embodiment, the wearable electronic device (300) may not include the camera modules (315, 316) among the plurality of camera modules (313, 314, 315, 316). Although not illustrated in FIGS. 3 and 4 , the wearable electronic device (300) may further include at least one of the configurations illustrated in FIGS. 1 and / or 2 .

[0070] In one embodiment, the display (331) may be understood to include a display module (e.g., display module (160) of FIG. 1) that outputs a screen, and a lens assembly (e.g., lens assembly (LA) of FIGS. 6 and 8) that focuses the output screen onto the user's eyes. In FIG. 4, it is noted that reference numerals are assigned to parts of the structure of the display (331) that are visible from the exterior of the wearable electronic device (300), indicating the lens closest to the user's eyes.

[0071] As described above, according to one embodiment, the wearable electronic device (300) may have a form factor for being worn on a user's head. The wearable electronic device (300) may further include a strap and / or a wearing member for being secured to a body part of the user. The wearable electronic device (300) may provide a user experience based on augmented reality, virtual reality, and / or mixed reality while being worn on the user's head.

[0072] FIG. 5 illustrates a path along which light output by a display (D) is focused or guided to a user's eye (E) in a wearable electronic device (300) according to one embodiment of the present disclosure.

[0073] Referring further to FIG. 5 along with FIG. 2, a wearable electronic device (300) according to an embodiment of the present disclosure may include a display (D), a lens assembly (LA) (e.g., a plurality of lenses (L1, L2, L3, L4)), at least one quarter wave plate (QWP) (203, 205), at least one reflective polarizer (RP) (202), and / or at least one beam splitter (204). In one embodiment, the at least one quarter wave plate (203, 205), the at least one reflective polarizer (202), and / or the at least one beam splitter (204) may be understood as part of the lens assembly (LA). In one embodiment, at least one of the plurality of lenses (L1, L2, L3, L4) may be movable to adjust a diopter, thereby providing a vision correction function to a user.

[0074] In one embodiment, at least one quarter wave plate (203, 205), at least one reflective polarizer (202), and at least one beam splitter (204) can extend and / or adjust the optical path length between the user's eye (E) and the display (D). For example, by implementing a focal length longer than the mechanical or physical length of the lens assembly (LA), the quality of the image provided to the user can be improved. Since wearable electronic devices (e.g., AR / VR glasses) have limitations in size or weight due to the actual use environment (e.g., use in a worn state), the resolution of the output virtual image may be limited, and it may be difficult to provide a good quality image to the user even through the optical system. In one embodiment, the wearable electronic device (300) includes an optical system (e.g., lens assembly (LA)) with a pancake lens structure, thereby extending the optical path length of the incident light relative to its external size, and / or increasing the image resolution provided to the user. For example, the wearable electronic device (300) may be an optical device (e.g., AR / VR glasses) that provides visual information to the user while being worn on the user's head or face by including a display (D) and a lens assembly (LA).

[0075] According to one embodiment, the display (D) may include a screen display area that displays visual information to portions corresponding to the user's eyes when the user wears the wearable electronic device (300). In one embodiment, the wearable electronic device (300) may include a pair of displays (D) corresponding to the user's eyes. The displays (D) may include, for example, a liquid crystal display (LCD), a light emitting diode (LED) display, an organic light emitting diode (OLED) display, a micro electro mechanical system (MEMS) display, or an electronic paper display. The displays (D) may display, for example, various contents (e.g., text, images, videos, icons, symbols, etc.) provided as visual information to the user.

[0076] According to one embodiment, various contents (e.g., text, images, videos, icons, or symbols, etc.) output in the form of light from the display (D) may be provided to the user's eyes by passing through at least one 1 / 4 wave plate (203, 205), at least one reflective polarizer (202), at least one beam splitter (204), and / or a lens assembly (LA). The order in which the light passes through the at least one 1 / 4 wave plate (203, 205), at least one reflective polarizer (202), at least one beam splitter (204), and / or the lens assembly (LA) may be set in various ways depending on the embodiment.

[0077] According to one embodiment, a first 1 / 4 wave plate (203) and a reflective polarizer (202) may be disposed on the eye side surface of the first lens (L1) (hereinafter, referred to as the “first lens (L1)”) of the lens assembly (LA) from the user’s eye (E), and a beam splitter (204) may be disposed on either the first lens (L1) or the second lens (L2) (hereinafter, referred to as the “second lens (L2)”) of the lens assembly (LA) from the user’s eye (E). For example, in the illustrated embodiment, the beam splitter (204) may be disposed on the display side surface of the second lens (L2), and in the embodiment described below, the beam splitter may be disposed on the display side surface of the first lens (L1). Here, “disposed on XX” may refer to being disposed adjacent to or substantially in contact with XX. For example, the beam splitter (204) may be positioned adjacent to the display-side surface of the first lens (L1) or the second lens (L2), or may be provided in a state of substantially contacting the display-side surface of the first lens (L1) or the second lens (L2).

[0078] In the illustrated embodiment, the first lens (L1) of the wearable electronic device (300) or the lens assembly (LA) may be understood as the lens positioned furthest from the display (D) among a plurality of lenses (e.g., at least four lenses), or the lens positioned closest to the user's eye (E). However, it should be noted that the embodiments of the present disclosure are not limited thereto. For example, although not illustrated, the wearable electronic device (300) or the lens assembly (LA) may further include a transmissive optical member positioned farther from the display (D) than the first lens (L1). In one embodiment, the transmissive optical member may have a refractive power that does not affect the optical performance of the wearable electronic device (300, 400) of FIG. 6 or FIG. 8 and / or the lens assembly (LA) described below. In one embodiment, the transmissive optical member positioned further from the display (D) than the first lens (L1) may have a transmittance of approximately 90% or more for visible light. In one embodiment, the transmissive optical member may have a transmittance close to 100% for visible light. In the illustrated embodiment, reference numeral '201' is intended to illustrate the first polarizer, but in one embodiment, the first polarizer may be omitted. In a structure in which the first polarizer is omitted, reference numeral '201' may be understood as the above-described transmissive optical member. In one embodiment, the transmissive optical member may be positioned between the first lens (L1) and the first polarizer (201) or between the reflective polarizer (202) and the first polarizer (201).

[0079] FIG. 5 illustrates an example in which a first quarter wave plate (203) and / or a reflective polarizer (202) are disposed adjacent to (or substantially in contact with) the user's eye-side surface among the two surfaces of the first lens (L1), and a beam splitter (204) is disposed adjacent to (or substantially in contact with) the display-side surface of the second lens (L2) (or the first lens (L1)). In one embodiment, the reflective polarizer (202) is configured in a film form and is laminated with the first quarter wave plate (203) to form a first film portion (F1) (or the first polarizing plate (F1) of FIG. 6), which can be attached to the first lens (L1) from the user's eye. Here, 'lamination' may mean that at least one of two different members is provided with an adhesive and is bonded to each other. In one embodiment, when the first 1 / 4 wave plate (203) and / or the reflective polarizer (202) are placed in contact with a lens (e.g., the first lens (L1)), for example, when attached to one surface of the first lens (L1), the surface of the first lens (L1) that is in contact with the first 1 / 4 wave plate (203) and / or the reflective polarizer (202) can be implemented as a substantially flat surface.

[0080] According to one embodiment, the first film portion (F1) in the form of a first 1 / 4 wave plate (203) and a reflective polarizer (202) laminated together may be thinner and have superior optical performance than a film portion having a simple laminated structure. According to one embodiment, the wearable electronic device (300), the lens assembly (LA), and / or the first film portion (F1) may further include at least one separately provided polarizing film (e.g., the first polarizer (201)), as illustrated in FIG. 5, and additionally or alternatively, may further include at least one anti-reflection (AR) film (not illustrated). In one embodiment, when the wearable electronic device (300) and / or the lens assembly (LA) further include a transmissive optical member (not illustrated), the transmissive optical member may be disposed between the reflective polarizer (202) and the first polarizer (201). For example, the first polarizer (201) may be understood as a part of the first film portion (F1) or as an independent component with respect to the first film portion (F1).

[0081] In one embodiment, a liquid crystal display, an organic light emitting diode display, and / or a micro LED can provide a good quality image by including a polarizing plate. In one embodiment, when the lens assembly (LA) further includes a first film portion (F1) and / or a first polarizer (201), the image quality perceived by the user can be improved even if the display (D) outputs an image of the same quality. In one embodiment, when combined with a lens assembly (LA) including a first film portion (F1), a second film portion (F2), and / or a first polarizer (201), some polarizing plates may be omitted from a display (D) implemented as an organic light emitting diode display or a micro LED. In one embodiment, the lens assembly (LA) may include a first film portion (F1) and / or a first polarizer (201), and the display (D) may include a polarizing plate.

[0082] Referring to FIG. 5, the first film portion (F1) (or polarizing plate) is positioned closer to the user's eye (E) than the lens assembly (LA) to selectively transmit, reflect, and / or block light entering the user's eye (e.g., light output from the display (D)). The beam splitter (204) may be positioned between the lenses of the lens assembly (LA), for example, between the first lens (L1) and the second lens or between the second lens (L2) and the third lens (L3). The beam splitter (204) may be configured to transmit a portion of the light incident on the beam splitter (204) and reflect another portion of the light incident on the beam splitter (204). For example, the beam splitter (204) may be configured to transmit approximately 50% of the light and reflect approximately 50% of the light. In one embodiment, the beam splitter (204) may be configured as a semi-transparent mirror, for example, in the form of a mirror coated on one surface of the first lens (L1) or the second lens (L2). Hereinafter, based on the functional aspect of light reflection, the reflective polarizer (202) may be referred to as a 'first reflective member', and the beam splitter (204) may be referred to as a 'second reflective member'.

[0083] In the following description, a direction from the user's eye (E) toward the display (D) may be referred to as a first direction, and a direction from the display (D) toward the user's eye (E) opposite to the first direction may be referred to as a second direction. The first direction and the second direction may be substantially parallel to the optical axis (O). The lens assembly (LA) may include a plurality of lenses (e.g., a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4)) sequentially arranged along the first direction.

[0084] According to one embodiment, the wearable electronic device (300) may include a second film portion (F2) (e.g., the second polarizing plate (F2) of FIG. 6) disposed at a position further from the user's eye (E) than the lens assembly (LA) to selectively transmit, reflect, and / or block light entering the lens assembly (LA). In the illustrated embodiment, the second film portion (F2) is exemplified as being disposed between the display (D) and the lens assembly (LA) (e.g., the fourth lens (L4)), and in the embodiment described below, the second film portion (F2) (e.g., the second polarizing plate (F2) of FIG. 6) may be exemplified as being disposed between the first lens (L1) and the second lens (L2). For example, the second film portion (F2) may be disposed at any position between the display (D) and the first lens (L1).

[0085] According to one embodiment, the second film portion (F2) may include a second 1 / 4 wavelength plate (205) and a second polarizer (206). Similar to the first film portion (F1), the second 1 / 4 wavelength plate (205) and the polarizer (206) may be laminated to implement the second film portion (F2). As previously mentioned, for the purpose of distinguishing the components, the 1 / 4 wavelength plate (203) of the first film portion (F1) described above may be referred to as the first 1 / 4 wavelength plate (203), and the 1 / 4 wavelength plate (205) of the second film portion (F2) may be referred to as the second 1 / 4 wavelength plate (205). Additionally, the polarizer (206) of the second film portion (F2) may be referred to as a second polarizer (206) to distinguish it from the first polarizer (201) included in the first film portion (F1).

[0086] According to one embodiment, when the first film portion (F1) is disposed adjacent to (or in contact with) the n-th lens (wherein 'n' is a natural number), the second film portion (F2) may be disposed on the n+1-th lens adjacent to the n-th lens. 'Disposed on the n+1-th lens' may be understood as meaning that the second film portion (F2) is disposed adjacent to or in contact with any one of the surfaces of the n+1-th lens. In one embodiment, the n-th lens may be understood as a lens (e.g., the first lens (L2)) that is disposed farthest from the display (D) among the lenses (L1, L2, L3, L4) of the lens assembly (LA). The second film portion (F2) may be substantially attached to any one of the surfaces of the n+1-th lens. The surface of the n+1-th lens to which the second film portion (F2) is attached may be substantially flat. As will be described later, when the first film portion (F2) including the first reflective member (e.g., reflective polarizer (202)) is placed on the user's eye side surface of the first lens (L1), the second reflective member (e.g., beam splitter (204)) may be placed on the display side surface of the first lens (L1) and the second film portion (F2) may be placed on the user's eye side surface of the second lens (L2).

[0087] According to one embodiment, the arrangement of the film portions (F1, F2) and / or the beam splitter (204) as described above can provide a good quality image while miniaturizing the optical system implemented with a limited number of lenses (e.g., approximately 4). For example, by reducing the number of lenses (or the number of lens surfaces) arranged between the reflective polarizer (202) as the first reflective member and the beam splitter (204) as the second reflective member, refraction or scattering, and / or birefringence due to manufacturing errors in the path of reflected light can be suppressed. As mentioned above, the more refraction or scattering occurs in the path from the display (D) to the user's eye (E), the more difficult it is to stabilize the optical performance or image quality.

[0088] According to one embodiment, the wearable electronic device (300) may operate as follows. Light output from the display (D) may reach the user's eye (E) after passing through the second film portion (F2), the lens assembly (LA), and the first film portion (F1). At this time, the second polarizer (206) of the second film portion (F2) may transmit the first linear polarization, for example, vertical polarization (or p polarization), and may not transmit the second linear polarization, for example, horizontal polarization (or s polarization). For example, among the light reaching the second polarizer (206), only vertical polarization (or p polarization) may be transmitted. Light transmitted through the second polarizer (206) is converted into circular polarization (right-hand circular polarization or left-hand circular polarization) by the second 1 / 4 wave plate (205), and this circular polarization can reach the first 1 / 4 wave plate (203) after passing through the lens assembly (LA) and the beam splitter (204). The circular polarization reaching the first 1 / 4 wave plate (203) is converted back into linear polarization (e.g., vertical polarization (or p-polarization)) while passing through the first 1 / 4 wave plate (203) and can reach the reflective polarizer (202). Until reaching the reflective polarizer (202), the light can move in the second direction (display (D) -> user's eye (E)). Light reaching the reflective polarizer (202) is reflected by the reflective polarizer (202) and directed in a first direction (user's eye (E) -> display (D)), and can be converted into circular polarization (right-hand circular polarization or left-hand circular polarization) while passing through the first 1 / 4 wave plate (203). This circular polarization (right-hand circular polarization or left-hand circular polarization) is reflected by the beam splitter (204) and directed in a second direction again, and at this time, the phase can be converted (for example, when it is left-hand circular polarization -> right-hand circular polarization, when it is right-hand circular polarization -> left-hand circular polarization). The circular polarization whose phase has been converted can pass through the first 1 / 4 wave plate (203) and the reflective polarizer (202) along the second direction and reach the user's eye (E).At this time, the light passing through the first 1 / 4 wave plate (203) is converted into horizontal polarization (or s polarization) and can reach the user's eye (E). However, the embodiment of FIG. 5 is an example of a state change of light passing through a wearable electronic device (300) according to one embodiment, and it should be noted that the conversion of polarization components by the reflective polarizer (202), the 1 / 4 wave plate (203, 205), the beam splitter (204), and / or the second polarizer (206) may be different from the mentioned embodiment.

[0089] In the embodiment of FIG. 5, the optical path from the display (D) to the user's eye (E) or the polarization state of the light passing through (or reflected) the film portions (F1, F2) or the beam splitter (204) is described. For the convenience of explanation of the optical path or the polarization state, FIG. 5 illustrates that the second film portion (F2) is disposed on the fourth lens (L4), but the embodiment(s) of the present disclosure are not limited thereto, and the first film portion (F1) and the second film portion (F2) may be disposed between two adjacent lenses (e.g., the first lens (L1) and the second lens (L2)), and the beam splitter (204) may be disposed between the first film portion (F1) and the second film portion (F2). The arrangement of these film portions (F1, F2) and / or the beam splitter (204) will become clearer through the embodiments described below.

[0090] FIG. 6 is a drawing showing a wearable electronic device (400) (e.g., the electronic device (101) of FIG. 1 or the wearable electronic devices (200, 300) of FIGS. 2 to 5) and / or a lens assembly (LA) according to one embodiment of the present disclosure. FIG. 7 is a drawing showing an enlarged portion A of FIG. 6 according to one embodiment of the present disclosure.

[0091] Referring to FIGS. 6 and 7, a wearable electronic device (400) may include a display (D) and a lens assembly (LA), and visual information output from the display (D) may be focused or guided by the lens assembly (LA) and provided to the user's eye (E). The lens assembly (LA) may include a plurality of, for example, at least four lenses (L1, L2, L3, L4) sequentially arranged along the optical axis (O) direction (e.g., lenses (L1, L2, L3, L4) of FIG. 5). For convenience of explanation, or as described above, the plurality of lenses (L1, L2, L3, L4) may be described separately by indicating an ordinal number such as 'first' or 'second' according to the order in which they are arranged in the direction from the user's eye (E) toward the display (D). In the reference numerals of the drawings, 'Ln' may indicate the n-th lens, 'En' may indicate the user eye-side surface of the n-th lens, and 'Dn' may indicate the display-side surface of the n-th lens. In one embodiment, the wearable electronic device (400) and / or the lens assembly (LA) may include polarizing plates (F1, F2) (e.g., film portions (F1, F2) of FIG. 5) disposed on two adjacent lenses (e.g., first lens (L1) and second lens (L2)) and a beam splitter (BS) (e.g., beam splitter (204) of FIG. 5) as a reflective member disposed between the polarizing plates (F1, F2).

[0092] According to one embodiment, the first polarizing plate (F1) among the polarizing plates (F1, F2) (e.g., the first film portion (F1) of FIG. 5) may be disposed on, for example, the user eye-side surface (E1) of the first lens (L1), and the second polarizing plate (F2) among the polarizing plates (F1, F2) (e.g., the second film portion (F2) of FIG. 5) may be disposed on one surface (e.g., the user eye-side surface (E2)) of the second lens (L2). As described above, the beam splitter (BS) may be disposed between the first polarizing plate (F1) and the second polarizing plate (F2), for example, on the display-side surface (D1) of the first lens (L1). For example, the wearable electronic device (400) and / or the lens assembly (LA) may include a first polarizing plate (F1), a beam splitter (BS), and / or a second polarizing plate (F2) sequentially arranged in a direction from the user's eye (E) toward the display (D). In one embodiment, when the first polarizing plate (F1) and the second polarizing plate (F2) are substantially attached to a surface of any one of the lenses (L1, L2, L3, L4), the corresponding lens surface (e.g., the user's eye-facing surface (E1) of the first lens (L1) and the user's eye-facing surface (E2) of the second lens (L2) in FIGS. 6 and 8) may be substantially planar.

[0093] As described with reference to FIG. 5, light or visual information output from the display (D) can be sequentially transmitted through the second polarizing plate (F2) and the beam splitter (BS), and then sequentially reflected by the first polarizing plate (F1) and the beam splitter (BS). The light or visual information reflected by the beam splitter (BS) can be provided to the user by transmitting through the first polarizing plate (F1). For example, at least a portion of the light or visual information output from the display (D) can transmit through the second polarizing plate (F2) and the beam splitter (BS) and reach the first polarizing plate (F1). The first polarizing plate (F1) can reflect at least a portion of the incident light (e.g., light transmitted through the second polarizing plate (F2) and the beam splitter (BS)), and at least a portion of the light reflected by the first polarizing plate (F1) can be reflected again by the beam splitter (BS) and guided to the user's eye (E). As a result, the visual information output from the display (D) can be reflected at least twice on the path to reach the user's eye (E). Although the lenses (L1, L2, L3, L4) are not mentioned when describing the path of the light passing through the polarizing plates (F1, F2) and / or the beam splitter (BS), the visual information output from the display (D) can be focused by the lenses (L1, L2, L3, L4) on the path to reach the user's eye.

[0094] In one embodiment, a 'polarizing plate' may be referred to as a polarizing member, a polarizing film, a polarizing sheet, a polarizing layer, a modulating member, a modulating film, and / or a modulating sheet. Here, 'modulating' may refer to filtering, reflecting, refracting, phase-modulating, and / or phase-retarding at least a portion of incident light. In one embodiment, the modulation tendency of the polarizing plate may vary depending on the wavelength of the incident light or the polarization component of the incident light. Such a polarizing plate may be implemented by a film, a sheet, a coating material, and / or a deposition material.

[0095] As described with reference to FIG. 5, the first polarizing plate (F1) may be disposed on or substantially in contact with the user eye-side surface (E1) of the first lens (L1). In one embodiment, the first polarizing plate (F1) may include a first quarter wave plate (e.g., the first quarter wave plate (203) of FIG. 5) and a reflective polarizer (e.g., the reflective polarizer (202) of FIG. 5) disposed to face the first lens (L1) with the first quarter wave plate (203) interposed therebetween. In one embodiment, the first polarizing plate (F1) may further include a first polarizer (201). The first polarizer (201) may lower the brightness of the image but may contribute to improving the image quality.

[0096] In one embodiment, although not shown, the first polarizing plate (F1) may further include at least one of an air layer, an adhesive layer, another polarizing layer, and / or a dummy layer disposed between the first 1 / 4 wave plate (203) and the reflective polarizer (202). The air layer, the adhesive layer, the other polarizing layer, and / or the dummy layer disposed between the first 1 / 4 wave plate (203) and the reflective polarizer (202) may have substantially no refractive power. In one embodiment, the phrase “the first polarizing plate (F1) includes an air layer” may refer to a structure in which the first 1 / 4 wave plate (203) and the reflective polarizer (202) are simply laminated. In one embodiment, the phrase “the first polarizing plate (F1) includes an adhesive layer, another polarizing layer, or a dummy layer” may refer to a structure in which the first 1 / 4 wave plate (203) and the reflective polarizer (202) are laminated. When including the first polarizer (201), the first polarizing plate (F1) may further include at least one of an air layer, an adhesive layer, another polarizing layer, and / or a dummy layer disposed between the reflective polarizer (202) and the first polarizer (201). In one embodiment, when including the first polarizer (201), the first polarizing plate (F1) may further include a transmissive optical member (not shown) disposed between the first polarizer (201) and the reflective polarizer (202). The transmissive optical member may protect lens(es) (e.g., lenses L1, L2, L3, L4)) or polarizer(s) (e.g., wave plates (203, 205), polarizers (202, 206), and / or beam splitter (204)) disposed between the display (D) and the transmissive optical member. In one embodiment, the transmissive optical member may not have refractive power. In one embodiment, the dummy layer may be substantially any of the transmissive optical members.

[0097] According to one embodiment, the second polarizing plate (F2) may be positioned on or substantially in contact with the user eye-side surface (E2) of the second lens (L2). In one embodiment, the second polarizing plate (F2) may include a second polarizer (e.g., the second polarizer (206) of FIG. 5) and a second 1 / 4 wave plate (e.g., the second 1 / 4 wave plate (205) of FIG. 5) arranged to face the second lens (L2) with the second polarizer (206) interposed therebetween. When the second polarizer (206) and the second 1 / 4 wave plate (205) are arranged, the polarization axis linearly polarized by the second polarizer (206) and the fast axis of the second 1 / 4 wave plate (205) may form a 45 degree angle. For example, the second polarizing plate (F2) may be configured to convert linearly polarized light into circularly polarized light. In one embodiment, when the first polarizing plate (F1) includes the first polarizer (201), the first The polarization axis of the polarizer (201) and the polarization axis of the second polarizer (206) may form a 90-degree angle. In one embodiment, the fast axis of the first 1 / 4 wave plate (203) and the fast axis of the second 1 / 4 wave plate (205) may form a 90-degree angle.

[0098] In the above-described embodiment, the first polarizing plate (F1) is mentioned as being disposed on the first lens (L1), and the second polarizing plate (F2) is mentioned as being disposed on the second lens (L2). However, it should be noted that the embodiment(s) of the present disclosure are not limited thereto. For example, the first polarizing plate (F1) may be disposed on the n-th lens, which is any one of the first lens (L1), the second lens (L2), and / or the third lens (L3), and when the first polarizing plate (F1) is disposed on the n-th lens, the second polarizing plate (F2) may be disposed on the n+1-th lens, which is any one of the second lens (L2), the third lens (L3), and / or the fourth lens (L4). For example, in one embodiment of the present disclosure, any one of a plurality of lenses (L1, L2, L3, L4) may be disposed between the first polarizing plate (F1) and the second polarizing plate (F2). In one embodiment, it can be understood that a first polarizing plate (F1) and a second polarizing plate (F2) are arranged with one of a plurality of lenses (L1, L2, L3, L4) between them.

[0099] In one embodiment, although not shown, the second polarizing plate (F2) may further include at least one of an air layer, an adhesive layer, another polarizing layer, and / or a dummy layer disposed between the second 1 / 4 wave plate (205) and the second polarizer (206). The configuration in which the second polarizing plate (F2) further includes at least one of an air layer, an adhesive layer, another polarizing layer, and / or a dummy layer disposed between the second 1 / 4 wave plate (205) and the second polarizer (206) may be similar to the configuration of the first polarizing plate (F1), and therefore, a detailed description thereof will be omitted.

[0100] In one embodiment, the beam splitter (BS) may be provided on a lens (e.g., the first lens (L1)) adjacent to (or substantially in contact with) the n-th lens, for example, the first polarizing plate (F1). In one embodiment, when the first polarizing plate (F1) is provided on the user eye-side surface (E1) of the first lens (L1), the beam splitter (BS) may be provided on the display-side surface (D1) of the first lens (L1). In one embodiment, the beam splitter (BS) may be formed to contact the display-side surface (D1) of the first lens (L1) by substantially depositing or coating an optical material. In one embodiment, the first polarizing plate (F1) functioning as a reflective member and the beam splitter (BS) are arranged such that the optical length of the lens assembly (LA) is greater than the mechanical (or physical) length, but the number of lenses (or lens surfaces) arranged between the first polarizing plate (F1) and the beam splitter (BS) may be minimized. For example, in a miniaturized lens assembly (LA) structure, a sufficient optical length can be secured by the reflective members (e.g., the first polarizing plate (F1) and the beam splitter (BS)), and by reducing the number of lenses or lens surfaces arranged between the reflective members (e.g., the first polarizing plate (F1) and the beam splitter (BS)), refraction or scattering can be suppressed, and the lens assembly (LA) can provide an image of improved quality. In one embodiment, the above-described 'refraction or scattering' may refer to birefringence due to manufacturing errors or errors occurring during the assembly process within an acceptable range. For example, by reducing the number of lenses or lens surfaces arranged between the reflective members (e.g., the first polarizing plate (F1) and the beam splitter (BS)), birefringence of the lens can be suppressed, and the lens assembly (LA) can provide an image of improved quality.

[0101] According to one embodiment, when birefringence occurs when light passes through the polarizing plates (F1, F2) and / or the beam splitter (BS) and then passes through the lenses (L1, L2, L3, L4) (or lens surfaces), the polarization characteristics may be distorted. In one embodiment, when the polarization characteristics are distorted, the flare phenomenon may increase, thereby degrading the image quality. In the embodiment(s) of the present disclosure, the optical length is increased by using polarizing plates (F1, F2) and / or a beam splitter (BS), and by placing the polarizing plates (F1, F2) and / or the beam splitter (BS) close to the user's eye and / or by minimizing the number of lenses (L1, L2, L3, L4) (or lens surfaces)(s) placed between the polarizing plates (F1, F2) and / or the beam splitter (BS), birefringence can be suppressed in the path from the light passing through the polarizing plates (F1, F2) and / or the beam splitter (BS) to the user's eye.

[0102] According to one embodiment, in a structure in which the polarizing plates (F1, F2) and / or the beam splitter (BS) as described above are arranged, the first lens on the user's eye side (e.g., the first lens (L1)) among at least four lenses (L1, L2, L3, L4) may have positive refractive power. When the first lens (L1) has positive refractive power and the first lens on the display side (e.g., the fourth lens (L4) in the case of including four lenses (L1, L2, L3, L4)) has positive refractive power, miniaturization of the lens assembly (LA) and / or the wearable electronic device (400) including the same may be facilitated. In one embodiment, among the plurality of lenses (L1, L2, L3, L4), at least one lens having negative refractive power may be arranged between the first lens (L1) and the first lens on the display side (e.g., the fourth lens (L4)). In one embodiment, the second polarizing plate (F2) may be disposed between the first lens (L1) from the user's eye side among the lenses having negative refractive power. In the embodiment of FIG. 6 or 7, the second polarizing plate (F2) is disposed on the second lens (L2) having negative refractive power, for example, the second polarizing plate (F2) may be disposed adjacent to (or substantially in contact with) the user's eye side surface (E2) of the second lens (L2). In one embodiment, the second polarizing plate (F2) may be understood to be disposed closer to the display (D) than the first polarizing plate (F1) and / or the beam splitter (BS).

[0103] According to one embodiment, the lens assembly (LA) can satisfy the condition presented by the following [mathematical expression 1].

[0104]

[0105] Here, 'TTL' is the distance from the user's eye side (E1) of the first lens (L1) to the display (D) (e.g., lens length), and 'DSP' may be the diagonal length of the display (D). In one embodiment, when the calculated value of [Mathematical Formula 1] is less than 1.0, miniaturization may be easy, but there may be a limit to securing stable optical performance due to difficulty in controlling aberrations. In one embodiment, when the calculated value of [Mathematical Formula 1] is greater than 1.8, optical performance may be easy to secure, but miniaturization may be difficult. For example, [Mathematical Formula 1] may present a condition under which the lens assembly (LA) can be miniaturized while providing good image quality.

[0106] According to one embodiment, the lens assembly (LA) can satisfy the condition presented by the following [Mathematical Formula 2].

[0107]

[0108] Here, 'Pvd' is the Abbe number of the lens having a positive refractive power and disposed closest to the user's eye or the lens on which the first polarizing plate (F1) (and / or beam splitter (BS)) is disposed, and may be the Abbe number of the first lens (L1) in the embodiment of FIG. 6. In [Mathematical Expression 2], 'Nvd' is the Abbe number of the lens having a negative refractive power and disposed closest to the user's eye or the lens on which the second polarizing plate (F2) is disposed, and may be the Abbe number of the second lens (L2) in the embodiment of FIG. 6. In one embodiment, by satisfying the condition of [Mathematical Expression 2] regarding the Abbe numbers of the lenses (e.g., the first lens (L1) and the second lens (L2)), chromatic aberration control of the lens assembly (LA) can be facilitated. For example, the lens assembly (LA) can provide stable optical performance by satisfying the condition of [Mathematical Expression 2].

[0109] According to one embodiment, the lens assembly (LA) can satisfy the condition presented by the following [Mathematical Formula 3].

[0110]

[0111] Here, 'Nefl' is an absolute value of the focal length of a lens (e.g., the second lens (L2) of FIG. 6) that has negative refractive power and is positioned closest to the user's eye, and 'efl' may be the focal length of the lens assembly (LA). In one embodiment, [Mathematical Expression 3] regarding the focal length presents a condition regarding the refractive power of a lens (e.g., the second lens (L2) of FIG. 6) that has negative refractive power and is positioned closest to the user's eye, and by satisfying the condition of [Mathematical Expression 3], the lens assembly (LA) can provide stable optical performance by facilitating aberration control.

[0112] According to one embodiment, the lens assembly (LA) as described above can provide good wide-angle or ultra-wide-angle performance by having a field of view (FOV) of about 90 degrees or more. In one embodiment, the user-eye-side surface (E1) of the first lens (L1) can be convex, in which case the first polarizing plate (F1) can be positioned adjacent to the user-eye-side surface (E1) of the first lens (L1). In one embodiment, in order to suppress manufacturing tolerances or assembly tolerances, the polarizing plates (F1, F2) can be attached to a corresponding one of at least four lenses (L1, L2, L3, L4). In the lenses (L1, L2, L3, L4), the surfaces to which the polarizing plates (F1, F2) are attached can be substantially flat.

[0113] According to one embodiment, the lens assembly (LA) of FIG. 6 or 7 may include a first lens (L1) having positive refractive power, a second lens (L2) having negative refractive power, a third lens (L3) having positive refractive power, and / or a fourth lens (L4) having positive refractive power. In one embodiment, the lens assembly (LA) may have an angle of view of approximately 90 degrees, a focal length of approximately 14.62 mm, and an F-number of approximately 3.65. In one embodiment, the maximum image height of the lens assembly (LA) may be approximately 12.56 mm, where the 'maximum image height' may refer to the maximum distance from a point where the optical axis (O) of the lens assembly (LA) passes through the active area of ​​the display (D) to the edge of the active area. In one embodiment, the maximum image height of the lens assembly (LA) may be half of the diagonal length 'DSP' of the display mentioned in [Mathematical Formula 1].

[0114] In one embodiment, the lens assembly (LA) can be manufactured with the specifications presented in [Table 1] and can have an aspheric coefficient in [Table 2]. The definition of asphericity can be calculated through the following [Mathematical Formula 4]. In [Table 1], 'REF.' exemplifies a reference number assigned to the lenses (L1, L2, L3, L4) and / or polarizing plates (F1, F2) of FIG. 6, and 'lens surface' describes an ordinal number assigned to a surface of a lens or polarizing plate that transmits (or reflects) visual information, and may be an ordinal number sequentially assigned along the reverse direction of the light path from the display to the user's eyes. The 'Display window' (e.g., 'W' in FIG. 6) of [Table 1] may be a substantially transparent plate as a plate for protecting the display.

[0115] In the lens assembly (LA) structure of FIG. 6, light guided to the user's eye may be transmitted twice through the user's eye-side surface (E1) of the first lens (L1), and may be transmitted once and reflected once through the display-side surface (D1) of the first lens (L1). For example, in [Table 1], lens surfaces 3 and 7 may be substantially the user's eye-side surface (E1) of the first lens, and lens surfaces 4 and 8 may be substantially the display-side surface (D1) of the first lens. In one embodiment, based on the data of [Table 1], it may be understood that the first polarizing plate (F1) is substantially attached to the user's eye-side surface (E1) of the first lens (L1), and the second polarizing plate (F2) is substantially attached to the user's eye-side surface (E2) of the second lens (L2). Although not given a separate lens surface number, a beam splitter (BS) may be provided between the first lens (L1) and the second polarizing plate (F2), for example, on the display-side surface (D1) of the first lens (L1).

[0116]

[0117] In [Mathematical Formula 4], "z" is the distance in the direction of the optical axis (O) from the point where the optical axis (O) passes on the lens surface, "y" is the distance from the optical axis (O) in the direction perpendicular to the optical axis (O), 'c'' is the reciprocal of the radius of curvature at the vertex of the lens, 'k' is the Conic constant, and 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', and 'O' may each represent an aspherical coefficient. The 'reciprocal of the radius of curvature' may represent a value (e.g., curvature) indicating the degree of curvature at each point of a curved surface or curve. Among the aspherical coefficient(s) of [Mathematical Formula 4], the aspherical coefficient whose value is 0 (zero) may be omitted from [Table 2] or [Table 4] described below.

[0118] REF.Lens surface (surface)Radius of curvature (radius)Thickness (Thick)MaterialRefractive index (nd)Abbe number (vd)Refraction modeEinfinityinfinityRefractionStopinfinity12RefractionF12infinity0.31Film1.5195864.2RefractionL13infinity4.589805'A551425'1.5475656.09Refraction4-50.9713-4.589805'A551425'1.5475656.09ReflectionF15infinity-0.31Film1.5195864.2Refraction6infinity0.31Film1.5195864.2ReflectionL17 infinity4.589805'A551425'1.5475656.09 refractive index8-50.97130.15 refractive indexF29infinity0.25Film1.5195864.2 refractive indexL210infinity2.137996'EP800025'1.671920.37 refractive index1132.97 8022.187813RefractionL312128.03153.848003'A551425'1.5475656.09Refraction13-221.0060.15RefractionL41412.285113.726384'A551425'1.5475656.09Refraction1534.564790.4RefractionDisplay window16infinity0.6BSC7_HOYA1.5195864.2Refraction17infinity0.101817Refractiondisplayinfinity0

[0119] 41112131415Radius-50.971332.97802128.0315-221.00612.2851134.56479k(conic)-0.834750.04390851.2242-66.1 717-0.4614-90A3.82E-062.40E-050.000219-0.00011-0.00027-0.00023B-5.08E-087.21E-08-1.62E-063.73E-062.07E-061. 02E-06C4.27E-108.44E-101.59E-08-2.78E-08-2.37E-084.38E-09D-2.08E-12-4.60E-12-9.90E-118.20E-111.06E-10-1.96E -11E5.39E-15-6.28E-143.48E-13-1.18E-13-3.20E-13-7.35E-14F-5.63E-182.29E-16-7.33E-162.74E-169.26E-163.23E-16

[0120] FIG. 8 is a drawing showing a wearable electronic device (500) (e.g., the electronic device (101) of FIG. 1 or the wearable electronic devices (200, 300) of FIGS. 2 to 5) and / or a lens assembly (LA) according to one embodiment of the present disclosure. FIG. 9 is a drawing showing an enlarged portion B of FIG. 8 according to one embodiment of the present disclosure.

[0121] According to one embodiment, the lens assembly (LA) of FIG. 8 or 9 may include a first lens (L1) having positive refractive power, a second lens (L2) having negative refractive power, a third lens (L3) having positive refractive power, and / or a fourth lens (L4) having positive refractive power. In one embodiment, the lens assembly (LA) may have an angle of view of approximately 110 degrees, a focal length of approximately 14.1975 mm, and an F-number of approximately 2.86. In one embodiment, the maximum image height of the lens assembly (LA) may be approximately 12.56 mm. In one embodiment, the lens assembly (LA) may be manufactured with the specifications presented in [Table 3], and may have an aspherical coefficient of [Table 4]. In [Table 3], 'REF.' exemplifies a reference number assigned to the lenses (L1, L2, L3, L4) and / or polarizing plates (F1, F2) of FIG. 8, and 'lens surface' describes an ordinal number assigned to a surface of a lens or polarizing plate that transmits (or reflects) visual information, and may be sequentially assigned an ordinal number along the reverse direction of the light path from the display to the user's eyes. The 'Display window' (e.g., 'W' of FIG. 8) of [Table 3] may be a substantially transparent plate as a plate for protecting the display, and the polarizing film of [Table 3] may be a polarizing film indicated by 'P' of FIG. 8, and the lens assembly (LA) of FIG. 8 may exemplify a structure in which the display (D) further includes a polarizing plate, regardless of whether the first polarizing plate (F1) includes a first polarizer (e.g., the first polarizer (201) of FIG. 5).

[0122] According to one embodiment, in the lens assembly (LA) of FIG. 8 or 9, the first polarizing plate (F1) may be disposed adjacent to the user eye-side surface (E1) of the first lens (L1) at a distance of approximately 0.265 mm. In [Table 3], lens surfaces 4, 6, and 8 may be substantially the user eye-side surface (E1) of the first lens (L1). In the lens assembly (LA) of FIG. 8 or 9, the second polarizing plate (F2) may be understood as being substantially attached to the user eye-side surface (E2) of the second lens (L2). Although not given a separate lens surface number, a beam splitter may be provided between the first lens (L1) and the second polarizing plate (F2), for example, on the display-side surface (D1) of the first lens (L1) (e.g., lens surface 5, lens surface 9).

[0123] REF.Lens surface (surface)Radius of curvature (radius)Thickness (Thick)MaterialRefractive index (nd)Abbe number (vd)Refraction modeeyeinfinityinfinityRefractionStopinfinity12.2RefractionF12infinity0.1023Film1.4947257.47Refraction3infinity0.265Film1.4947257.47RefractionL14infinity5'opti6025'1.4989457.66Refraction5-51.6745-5'opti6025'1.4989457.66ReflectionL1 (4)6infinity-0.265Film1.4947257.47RefractionF1 (3)7infinity0.265Film1.4947257.47ReflectionL18infinity5'opti6025'1.4989457.66Refraction9-51.67450.16RefractionF210infinity0.2016Film1.4947257.47RefractionL211infinity1.6'EP800025'1.671920.37Refraction125 9.855050.25RefractionL313370.03655.415'K26R25'1.5381555.71Refraction14-54.04130.145RefractionL415224.298'K26R25'1.5381555.71Refraction16-25.55650.596RefractionPolarizing Film17infinity0.2016Film1.4947257.47RefractionDisplay Window18infinity0.7BSC7_HOYA1.5195864.2Refraction19infinity-0.0002Refractiondisplayinfinity0

[0124] 51213141516 Radius of curvature (Radius) - 51.674559.85505370.0365-54.041322-25.5565K-0.52531-990-99-1.460910A5.21E-060.0006820.001015-0.00026-0.000510.002074 B-9.32E-08-2.27E-05-3.29E-059.97E-061.39E-05-9.21E-05C1.08E-094.17E-0 75.62E-07-2.07E-07-1.25E-072.08E-06D-5.46E-12-4.32E-09-5.23E-092.74E-0 9-9.94E-10-2.78E-08E1.02E-152.64E-112.77E-11-2.31E-112.83E-112.32E-10 F1.15E-16-9.84E-14-8.31E-141.21E-13-2.37E-13-1.21E-12G-5.04E-192.21E-1 61.31E-16-3.83E-161.00E-153.86E-15H8.90E-22-2.74E-19-7.99E-206.60E-19 -2.15E-18-6.83E-18J-5.81E-251.45E-22-8.10E-24-4.78E-221.88E-215.17E-21

[0125] [Table 5] below describes the calculated values ​​of [Mathematical Formula 1], [Mathematical Formula 2] and / or [Mathematical Formula 3] based on the specifications of the lens assembly (LA) of FIG. 6 or FIG. 8.

[0126] Example of Fig. 6 Example of Fig. 8 [Mathematical Formula 1] Output value 1.469 1.507 [Mathematical Formula 2] Output value 0.363 0.353 [Mathematical Formula 3] Output value 0.298 0.159

[0127] A lens assembly (e.g., a lens assembly (LA) of FIG. 2, FIG. 5, FIG. 6, or FIG. 8) and / or a wearable electronic device including the same (e.g., an electronic device (101) of FIG. 1, a wearable electronic device (200, 300, 400, 500) of FIGS. 2 to 6, or FIG. 8) according to an embodiment(s) of the present disclosure can be miniaturized while easily controlling aberrations and implementing good image quality by satisfying at least some of the above-described specifications or conditions. For example, even when used while worn on a user's head or face, the lens assembly and / or a wearable electronic device including the same can reduce user fatigue.

[0128] The effects that can be obtained from the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly understood by a person having ordinary skill in the art to which the present disclosure pertains from the description of the above-described embodiment(s).

[0129] According to one embodiment of the present disclosure, a wearable electronic device (e.g., electronic device (101) of FIG. 1, wearable electronic devices (200, 300, 400, 500) of FIGS. 2 to 6 or 8) may include a display configured to output visual information (e.g., display module (160) of FIG. 1, display (D, 331) of FIGS. 2 to 6 or 8), and a lens assembly configured to focus or guide visual information output from the display (e.g., lens assembly (LA) of FIG. 5, FIG. 6 or FIG. 8). In one embodiment, the lens assembly comprises at least four lenses (e.g., lenses L1, L2, L3, L4 of FIG. 5, FIG. 6, or FIG. 8) sequentially arranged in a direction toward the display along an optical axis (e.g., an optical axis (O) of FIG. 6 or FIG. 8), a first polarizing plate (e.g., a first film portion (F1) of FIG. 5, or a first polarizing plate (F1) of FIG. 6 or FIG. 8) disposed on an eye side surface of one of the at least four lenses (hereinafter, 'n-th lens') (e.g., the first lens (L1) of FIG. 5, FIG. 6, or FIG. 8), a beam splitter (e.g., a beam splitter (204) of FIG. 5, or a beam splitter (BS) of FIG. 6 or FIG. 8) disposed on a display side surface of the n-th lens, and a beam splitter (e.g., a beam splitter (204) of FIG. 5, or a beam splitter (BS) of FIG. 6 or FIG. 8) of the at least four lenses. The second polarizing plate (e.g., the second polarizing plate (F2) of FIG. 6 or FIG. 8) may be disposed on a user-eye side of the n+1th lens (e.g., the second lens (L2) of FIG. 6 or FIG. 8) disposed adjacent to the nth lens and between the display. In one embodiment, the first polarizing plate may be configured to reflect at least a portion of visual information output from the display, and the beam splitter may be configured to reflect at least a portion of visual information reflected by the first polarizing plate.

[0130] According to one embodiment, the nth lens is positioned farthest from the display among the at least four lenses and may have positive refractive power.

[0131] According to one embodiment, the nth lens may be a lens having a positive refractive power and is positioned farthest from the display among the at least four lenses, and the n+1th lens may have a negative refractive power.

[0132] According to one embodiment, among the at least four lenses, the lens disposed between the n+1-th lens and the display and closest to the display (e.g., the fourth lens (L4) of FIG. 6 or FIG. 8) may have a positive refractive power.

[0133] In one embodiment, at least one of the user-eye side surface of the nth lens or the user-eye side surface of the n+1th lens may be flat. In one embodiment, the lens assembly may have a field of view (FOV) of 90 degrees or more.

[0134] According to one embodiment, the first polarizing plate may include a reflective polarizer (e.g., the reflective polarizer (202) of FIG. 5), and a first quarter wave plate (e.g., the first quarter wave plate (203) of FIG. 5) disposed between the reflective polarizer and the n-th lens.

[0135] In one embodiment, the first polarizing plate may further include at least one of an air layer, an adhesive layer, another polarizing layer, or a dummy layer disposed between the reflective polarizer and the first 1 / 4 wave plate.

[0136] According to one embodiment, the first polarizing plate may further include a first polarizer (e.g., the first polarizer (201) of FIG. 5) positioned to face the first 1 / 4 wave plate with the reflective polarizer therebetween.

[0137] According to one embodiment, the first polarizing plate may further include a transmissive optical member disposed between the first polarizer and the reflective polarizer.

[0138] According to one embodiment, the second polarizing plate may include a second 1 / 4 wave plate (e.g., the second 1 / 4 wave plate (205) of FIG. 5), and a second polarizer (e.g., the second polarizer (206) of FIG. 5) disposed between the second 1 / 4 wave plate and the n+1-th lens.

[0139] In one embodiment, the second polarizing plate may further include at least one of an air layer, an adhesive layer, another polarizing layer, or a dummy layer disposed between the second polarizer and the second 1 / 4 wave plate.

[0140] According to one embodiment, the polarization axis linearly polarized by the second polarizer and the fast axis of the second 1 / 4 wave plate form a 45 degree angle, so that the second polarization plate can be configured to convert linearly polarized light into circularly polarized light.

[0141] In one embodiment, the first polarizing plate may include a first polarizer, and the second polarizing plate may include a second polarizer. In one embodiment, a wearable electronic device in which the polarization axis of the first polarizer and the polarization axis of the second polarizer form a 90-degree angle.

[0142] In one embodiment, the first polarizing plate may include a first quarter wave plate, and the second polarizing plate may include a second quarter wave plate. In one embodiment, the fast axis of the first quarter wave plate and the fast axis of the second quarter wave plate may form a 90 degree angle.

[0143] According to one embodiment, the lens assembly can satisfy the following [Conditional Expression 1].

[0144] [Condition 1]

[0145] 1.0 <= TTL / DSP <= 1.8

[0146] Here, 'TTL' may be the distance from the user's eye side of the lens furthest from the display to the display, and 'DSP' may be the diagonal length of the display.

[0147] According to one embodiment, the lens assembly can satisfy the following [Conditional Expression 2] regarding the Abbe number, Pvd, of the n-th lens and the Abbe number, Nvd, of the n+1-th lens.

[0148] [Condition 2]

[0149] 0.1 <= Nvd / Pvd <= 0.5

[0150] According to one embodiment, the lens assembly can satisfy the following [Conditional Expression 3] regarding the total effective focal length, efl, and the absolute value of the effective focal length, Nefl, of the n+1th lens.

[0151] [Condition 3]

[0152] 0.1 <= efl / Nefl <= 0.8

[0153] According to one embodiment of the present disclosure, a wearable electronic device (e.g., electronic device (101) of FIG. 1, wearable electronic devices (200, 300, 400, 500) of FIGS. 2 to 6 or 8) may include a display configured to output visual information (e.g., display module (160) of FIG. 1, display (D, 331) of FIGS. 2 to 6 or 8), and a lens assembly configured to focus or guide visual information output from the display (e.g., lens assembly (LA) of FIG. 5, FIG. 6 or FIG. 8). In one embodiment, the lens assembly comprises at least four lenses (e.g., lenses L1, L2, L3, L4 of FIG. 5, FIG. 6, or FIG. 8) arranged sequentially in a direction toward the display along an optical axis (e.g., an optical axis (O) of FIG. 6 or FIG. 8), one of the at least four lenses (hereinafter, 'n-th lens') (e.g., the first lens (L1) of FIG. 5, FIG. 6, or FIG. 8) disposed on a user's eye-side surface, and a first polarizing plate (e.g., the first film portion (F1) of FIG. 5, or the first polarizing plate (F1) of FIG. 6 or FIG. 8) including a reflective polarizer (e.g., the reflective polarizer (202) of FIG. 5) and a first 1 / 4 wavelength plate (e.g., the first 1 / 4 wavelength plate (203) of FIG. 5) disposed between the reflective polarizer and the n-th lens, the beam being disposed on the display-side surface of the n-th lens. A splitter (e.g., a beam splitter (204) of FIG. 5, or a beam splitter (BS) of FIG. 6 or FIG. 8), and a second polarizing plate (e.g., a second film portion (F2) of FIG. 5, or a second polarizing plate (F2) of FIG. 6 or FIG. 8) disposed on a user's eye side of an n+1-th lens adjacent to the n-th lens among the at least four lenses and disposed between the n-th lens and the display, and including a second 1 / 4 wave plate (e.g., a second 1 / 4 wave plate (205) of FIG. 5) and a second polarizer (e.g., a second polarizer (206) of FIG. 5) disposed between the second 1 / 4 wave plate and the n+1-th lens.In one embodiment, the nth lens has positive refractive power, the n+1th lens has negative refractive power, and among the at least four lenses, a lens disposed between the n+1th lens and the display and closest to the display may have positive refractive power.

[0154] According to one embodiment, the lens assembly can satisfy the following [Conditional Expression 1].

[0155] [Condition 1]

[0156] 1.0 <= TTL / DSP <= 1.8

[0157] Here, 'TTL' may be the distance from the user's eye side of the lens furthest from the display to the display, and 'DSP' may be the diagonal length of the display.

[0158] According to one embodiment, the lens assembly can satisfy the following [Conditional Expression 2] regarding the Abbe number, Pvd, of the n-th lens and the Abbe number, Nvd, of the n+1-th lens.

[0159] [Condition 2]

[0160] 0.1 <= Nvd / Pvd <= 0.5

[0161] While this disclosure has been described by way of example and example, it should be understood that the example is intended to be illustrative and not limiting. It will be apparent to those skilled in the art that various changes in form and detail may be made without departing from the overall scope of this disclosure, including the appended claims and their equivalents.

Claims

1. In a wearable electronic device (101; 200; 300; 400; 500), A display (160, D) configured to output visual information; and Includes a lens assembly (LA) configured to focus or guide visual information output from the display, The above lens assembly (LA) is, At least four lenses (L1, L2, L3, L4) arranged sequentially in a direction toward the display along the optical axis (O); A first polarizing plate (F1) arranged on the eye side surface of one of the above at least four lenses (hereinafter, “n-th lens”); A beam splitter (204; BS) arranged on the display side surface of the above n-th lens; and A second polarizing plate (F2) is disposed on the user's eye side of the n+1th lens, which is adjacent to the nth lens among the at least four lenses and is disposed between the nth lens and the display. A wearable electronic device, wherein the first polarizing plate is configured to reflect at least a portion of visual information output from the display, and the beam splitter is configured to reflect at least a portion of the visual information reflected by the first polarizing plate.

2. In paragraph 1, The above nth lens (L1) is positioned farthest from the display among the at least four lenses and is a lens having positive refractive power. The above n+1th lens (L2) is a lens with negative refractive power. A wearable electronic device, wherein among the at least four lenses, the lens (L4) positioned between the n+1th lens and the display and closest to the display is a lens having a defined refractive power.

3. In any one of claims 1 to 2, at least one of the user eye side surface of the nth lens or the user eye side surface of the n+1th lens is flat. The above lens assembly is a wearable electronic device having a field of view (FOV) of 90 degrees or more.

4. In any one of clauses 1 to 3, the first polarizing plate, a reflective polarizer (202); and A wearable electronic device including a first quarter wave plate (203) positioned between the reflective polarizer and the nth lens.

5. A wearable electronic device in accordance with claim 4, wherein the first polarizing plate further includes at least one of an air layer, an adhesive layer, another polarizing layer, or a dummy layer disposed between the reflective polarizer and the first 1 / 4 wavelength plate.

6. A wearable electronic device according to any one of claims 4 to 5, wherein the first polarizing plate further includes a first polarizer positioned facing the first 1 / 4 wave plate with the reflective polarizer interposed therebetween.

7. A wearable electronic device in accordance with claim 6, wherein the first polarizing plate further includes a transmissive optical member disposed between the first polarizer and the reflective polarizer.

8. In any one of clauses 1 to 7, the second polarizing plate, 2nd 1 / 4 wave plate (205); and A wearable electronic device comprising a second polarizer (206) positioned between the second 1 / 4 wave plate and the n+1th lens.

9. A wearable electronic device in accordance with claim 8, wherein the second polarizing plate further includes at least one of an air layer, an adhesive layer, another polarizing layer, or a dummy layer disposed between the second polarizer and the second 1 / 4 wavelength plate.

10. A wearable electronic device according to any one of claims 8 to 9, wherein the polarization axis linearly polarized by the second polarizer and the fast axis of the second 1 / 4 wave plate form a 45 degree angle, so that the second polarizing plate is configured to convert linearly polarized light into circularly polarized light.

11. In any one of clauses 1 to 10, the first polarizing plate includes a first polarizer, and the second polarizing plate includes a second polarizer. A wearable electronic device in which the polarization axis of the first polarizer and the polarization axis of the second polarizer form a 90 degree angle.

12. In any one of claims 1 to 11, the first polarizing plate comprises a first 1 / 4 wavelength plate, and the second polarizing plate comprises a second 1 / 4 wavelength plate. A wearable electronic device wherein the fast axis of the first 1 / 4 wave plate and the fast axis of the second 1 / 4 wave plate form a 90 degree angle.

13. A wearable electronic device according to any one of claims 1 to 12, wherein the lens assembly satisfies the following [Conditional Expression 1]. [Condition 1] 1.0 <= TTL / DSP <= 1.8 Here, 'TTL' is the distance from the user's eye side of the lens farthest from the display to the display, and 'DSP' is the diagonal length of the display.

14. A wearable electronic device according to any one of claims 1 to 13, wherein the lens assembly satisfies the following [Conditional Expression 2] regarding the Abbe number, Pvd, of the n-th lens and the Abbe number, Nvd, of the n+1-th lens. [Condition 2] 0.1 <= Nvd / Pvd <= 0.5 15. A wearable electronic device according to any one of claims 1 to 14, wherein the lens assembly satisfies the following [Conditional Expression 3] regarding the total effective focal length, efl, and the absolute value of the effective focal length, Nefl, of the n+1th lens. [Condition 3] 0.1 <= efl / Nefl <= 0.8

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