Wearable electronic device including polarizing structure

Abstract

According to various embodiments disclosed herein, a wearable electronic device includes: three or more lenses; and a polarizing unit comprising a polarizer, a reflective polarizer, a quarter wave plate, and a beam splitter that are sequentially disposed along a first direction, wherein the polarizer, the reflective polarizer, and the quarter wave plate are disposed spaced apart from the beam splitter with at least one lens among the three or more lenses interposed therebetween, and the polarizing unit includes a layer that is harder than the polarizer and the reflective polarizer.

Description

Wearable electronic devices comprising polarizing structures

[0001] Embodiments of the present disclosure relate to electronic devices, for example, wearable electronic devices including polarizing structures.

[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 information 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 lens assembly may be provided, which includes at least three lenses; and a polarization part (PP) including a polarizer, a reflective polarizer, a quarter wave plate, and a layer harder than the polarizer and the reflective polarizer, which are arranged spaced apart from the beam splitter with at least one lens therebetween and are sequentially arranged along a first direction.

[0008] According to one embodiment of the present disclosure, a lens assembly may be provided, which includes at least three lenses; and a polarization part (PP) that is arranged spaced apart from a beam splitter with at least one lens therebetween, and includes a polarizer, a reflective polarizer, a quarter-wave plate, and a layer having a modulus greater than that of the polarizer and the reflective polarizer, which are arranged sequentially along a first direction.

[0009] According to one embodiment of the present disclosure, a wearable electronic device may be provided, including: at least three lenses arranged between a user's eye (E) side and a display (D) side and aligned along an optical axis; and a polarization part (PP) arranged spaced apart from a beam splitter with at least one lens therebetween, and including a polarizer, a reflective polarizer, a quarter-wave plate sequentially arranged from the user's eye side toward the display side, and a rigid layer arranged between the polarizer and the reflective polarizer.

[0010] 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.

[0011] FIG. 1 is a block diagram illustrating an electronic device within a network environment according to one embodiment of the present disclosure.

[0012] FIG. 2 is a diagram illustrating a wearable electronic device according to one embodiment of the present disclosure.

[0013] FIG. 3 is a drawing showing the front of a wearable electronic device according to one embodiment of the present disclosure.

[0014] FIG. 4 is a drawing showing the back of a wearable electronic device according to one embodiment of the present disclosure.

[0015] 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.

[0016] FIG. 6 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.

[0017] FIG. 7 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.

[0018] FIG. 8 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 a first embodiment of the present disclosure.

[0019] FIG. 9 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 a second embodiment of the present disclosure.

[0020] FIG. 10 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 a third embodiment of the present disclosure.

[0021] FIG. 11 is a drawing showing a laminated structure between a polarizing portion and lenses of a wearable electronic device according to one embodiment of the present disclosure.

[0022] Fig. 12 is a drawing showing a polarizing part being combined according to various embodiments.

[0023] Figure 13 is a drawing showing the surface roughness and resolution of a combined polarizing part according to various embodiments.

[0024] Figure 14 is a drawing showing locations where resolution is measured in two different directions centered on the optical axis.

[0025] Figure 15 is a drawing showing the assembly of a polarizing element combined with a lens into a lens barrel.

[0026] Figure 16 is a drawing showing the process of attaching a polarizing element to a lens.

[0027] Figure 17 is a block diagram showing the process of attaching a polarizing element to a lens.

[0028] FIG. 18 is a diagram illustrating a composite structure of a lens and a polarizer according to various embodiments, and MTF peak curves and surface roughness.

[0029] FIG. 19 is a diagram conceptually comparing the first embodiment, the second embodiment, and the third embodiment of the present disclosure.

[0030] Throughout the attached drawings, similar reference numbers may be assigned to similar parts, components and / or structures.

[0031] Wearable electronic devices implementing 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 minimize 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. According to 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 even with a limited number of lenses.

[0032] An optical system with a pancake lens structure can implement an optical path of sufficient length compared to the total length of the lens by reflecting the visual information output from the display at least twice on the path to the user's eye. Here, the 'lens total length' can mean the distance from the subject-side (the user's eye-side) of the lens closest to the subject (e.g., the user's eye) to the display-side of the lens closest to the display (the lens furthest from the subject). A wearable electronic device including a pancake lens structure can have the shortest lens total length compared to a wearable electronic device manufactured including a general lens or a Fresnel lens, assuming that the required focal length between the display and the lens is the same. For example, a wearable electronic device including a pancake lens structure has the advantage of being able to reduce the lens total length by approximately 70% compared to a wearable electronic device including a general concave or convex lens structure. In addition, the pancake lens structure can provide good image quality while being miniaturized.

[0033] To achieve this, the pancake lens structure may include a polarizing part (PP). The polarizing part can typically be implemented in the form of a polarizing film. For example, the polarizing part can be implemented in the form of a plurality of sub-polarizing films laminated. However, when multiple sub-polarizing films are laminated, each sub-polarizing film has its own unique optical axis characteristics, which may result in surface wrinkles and / or resolution degradation due to poor illumination.

[0034] According to the present disclosure, surface wrinkles caused by a polarizing film can be alleviated, eliminated, and / or prevented, thereby reducing image distortion and increasing resolution.

[0035] 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, and can provide a wearable electronic device including a polarizing unit that realizes good image quality by alleviating, eliminating, and / or preventing wrinkles caused by a polarizing film.

[0036] One embodiment of the present disclosure can reduce distortion and increase resolution of a screen displayed in a wearable electronic device by alleviating, eliminating, and / or preventing surface wrinkles caused by a polarizing film.

[0037] 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.

[0038] The technical problems to be achieved in the present disclosure 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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). According to one embodiment, at least one of these components (e.g., the connection terminal (178)) may be omitted, or one or more other components may be added to the electronic device (101). According to 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)).

[0043] 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.

[0044] 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.

[0045] 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).

[0046] 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).

[0047] 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).

[0048] 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.

[0049] 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.

[0050] 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).

[0051] 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.

[0052] 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.

[0053] 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).

[0054] 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.

[0055] The camera module (180) can capture still images and videos. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0056] 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).

[0057] 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.

[0058] 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).

[0059] 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.

[0060] 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).

[0061] 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.

[0062] 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)).

[0063] 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.

[0064] FIG. 2 is a drawing showing a wearable electronic device (200) according to one embodiment of the present disclosure.

[0065] 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.

[0066] 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.

[0067] 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 the response to the request. For example, the external electronic device (102) renders content data executed in the 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 the 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).

[0068] 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).

[0069] 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 user's right eye and left eye, respectively, when the wearable electronic device (200) is worn on the user's body. According to 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.

[0070] 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. According to 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 concentration is adjusted. According to one embodiment, the display member may include a lens including a waveguide or a reflective lens, and an image output from a light 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 a light 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 see-through. According to one embodiment, the waveguide may be understood as a part of a lens assembly. The lens assembly (e.g., the lens assembly (LA) of FIGS. 5 to 9 hereinafter) is a configuration including a plurality of lenses (e.g., L1, L2, L3, L4), and may be arranged in a state aligned with a ray axis (O) (e.g., the ray axis (DE) of FIGS. 5 to 9 ) in a space within the wearable electronic device (200).The configuration in which visual information output from the display (D) is provided to the user's eyes through the lens assembly will be reviewed again below with reference to Fig. 5.

[0071] FIGS. 3 and 4 are drawings showing the front and back of a wearable electronic device (300) according to one embodiment.

[0072] Referring to FIGS. 3 and 4, according to 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).

[0073] According to one embodiment, the camera modules (311, 312) can acquire images related to the environment surrounding the wearable electronic device.

[0074] According to one embodiment, the camera modules (313, 314, 315, 316) can acquire images while the wearable electronic device is worn by the 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. According to one embodiment, the camera modules (311, 312) can also be used for hand detection and tracking or recognition or detection of user gestures.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] According to one embodiment, the display (331) (and / or lens) may be disposed on the second side (320) of the wearable electronic device (300). According to 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. According to 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 .

[0079] According to 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 visible from the exterior of the wearable electronic device (300) in the structure of the display (331), indicating the lens closest to the user's eyes.

[0080] As described above, according to one embodiment, the wearable electronic device (300) may have a form factor that is suitable for being worn on a user's head. The wearable electronic device (300) may further include a strap and / or a wearable 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.

[0081] 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 (400) according to one embodiment of the present disclosure.

[0082] Referring to FIG. 5 together with FIG. 2, a wearable electronic device (400) 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)), and a polarization part (PP). The wearable electronic device (400) may be an optical device (e.g., AR / VR glasses) that provides visual information to a user while being worn on the user's head or face by including the display (D) and the lens assembly (LA). The polarization part (PP) may be a component that is combined with the lens assembly (LA). According to an embodiment, the lens assembly (LA) may be interpreted as having at least three lenses, and in this case, the polarization part (PP) may be interpreted as a component separate from the lens assembly (LA). However, it is not necessarily limited thereto, and according to the present disclosure, the lens assembly (LA) may be defined as including the polarizing portion (PP) based on the manner in which the polarizing portion (PP) is combined with the lens assembly (LA).

[0083] According to one embodiment, the display (D) may include a screen display area that displays visual information to a portion corresponding to both eyes of the user when the user wears the wearable electronic device (400). According to one embodiment, the wearable electronic device (400) may include a pair of displays (D) corresponding to both eyes of the user. 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.

[0084] According to one embodiment, the lens assembly (LA) may be formed by a combination of a plurality of lenses. According to one embodiment, the plurality of lenses may be surrounded by a lens barrel (e.g., the lens barrel (LB) of FIG. 14 below). FIG. 5 illustrates three lenses (L1, L2, L3) as the plurality of lenses, but is not necessarily limited thereto, and a greater number of lenses may be applied.

[0085] In the present disclosure, the polarizing part (PP) may include a polarizer (POL) (401), a quarter wave plate (QWP) (403), and a reflective polarizer (RP) (402).

[0086] According to one embodiment, the polarizer (401) may be configured to absorb light vibrating in a specific direction and transmit only the polarized component in the direction (hereinafter referred to as the "optical direction") perpendicular to the light propagation path (DE) (hereinafter referred to as the "ray axis (DE)"). The polarizer (401) may be, for example, implemented by adsorbing iodine onto a polyvinyl alcohol (PVA) film and then stretching it. In this case, the optical axis direction may be defined according to the arrangement direction of the iodine molecular structure. For example, the polarizer (401) of the present disclosure may be applied to have a thickness of approximately 20 μm. Natural light can be converted into linear polarization through such a polarizer (401).

[0087] The reflective polarizer (402) may be configured to transmit linearly polarized light among the light passing through it, while reflecting some of the linearly polarized light. For example, the reflective polarizer may reflect vertically polarized light among linearly polarized light and transmit horizontally polarized light. Or, conversely, the reflective polarizer may reflect horizontally polarized light among linearly polarized light and transmit vertically polarized light. To this end, the reflective polarizer (402) may be formed by stretching an optical film composed of hundreds of reflective layers, which may reflect some of the polarized light and transmit some of the polarized light. The reflective polarizer (402) may have a thickness greater than that of the polarizer (401), and for example, the reflective polarizer (402) may have a thickness of approximately 35 μm to 60 μm.

[0088] In one embodiment, for example, a wave in a uniaxial crystal can be separated into two components, for example, a component (h) parallel to the optic axis and a component (v) perpendicular to the optic axis, and the components (h) parallel to the optic axis and (v) perpendicular to the optic axis can accumulate phase at different rates. The quarter wave plate (403) can be configured to convert the polarization state of the light separated into the components (h) parallel to the optic axis and (v) perpendicular to the optic axis. The quarter wave plate (403) can also be referred to as a phase retarder. The quarter wave plate (403) can be, for example, made of a birefringent material and have different refractive indices in two different axes (fast axis, slow axis) directions. Among the light passing through the quarter wave plate (403), light aligned with the fast axis can pass through the quarter wave plate (403) more quickly, and light aligned with the slow axis can pass through the quarter wave plate (403) relatively more slowly. Using this principle, linearly polarized light passing through the quarter wave plate (403) can be changed into circularly polarized light when it passes through at an angle of +45 degrees (or an angle of -45 degrees) with respect to the fast axis, and conversely, circularly polarized light can be changed into linearly polarized light when it passes through at an angle of +45 degrees (or an angle of -45 degrees) with respect to the fast axis.

[0089] According to one embodiment, at least one of the polarizer (401), the quarter wave plate (403), and / or the reflective polarizer (402), or the entire polarizing portion (PP) may be understood as a part of the lens assembly (LA). As described above, the polarizing portion (PP) may be understood as a component included in the lens assembly (LA). According to one embodiment, the lens assembly (LA) may further include a beam splitter (404) (or a light diffusion member). According to one embodiment, the beam splitter (404) may also be understood as a component included in the lens assembly (LA). According to one embodiment, the wearable electronic device (400) may provide a vision correction function to the user by adjusting a diopter by having at least one of a plurality of lenses (e.g., L1, L2, L3) moveable.

[0090] According to one embodiment, the polarizer (PP) is arranged between the user's eye (E) and the display (D) to change the propagation path of light output from the display (D). For example, the polarizer (401), the quarter wave plate (403), and the reflective polarizer (402) can change the propagation path of light passing through them, thereby substantially extending the propagation path of light longer than the mechanical or physical length of the lens assembly (LA). Here, the change in the propagation path of light by the polarizer (401), the quarter wave plate (403), and the reflective polarizer (402) can be understood as changing the polarization state of the light. By implementing a focal length longer than the mechanical or physical length of the lens assembly (LA) using the polarizer (PP), the quality of the image provided to the user can be improved. Since the wearable electronic device (400) is limited in size and weight due to the actual usage environment (e.g., used in a worn state), the resolution of the virtual image output may be limited, and it may be difficult to provide a good quality image to the user even through the optical system. According to one embodiment, the wearable electronic device (400) may include an optical system having a pancake lens structure (e.g., a lens assembly (LA) including a polarizing portion (PP)), 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.

[0091] 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) can be provided to the user's eyes by passing through a lens assembly (LA) including a polarizing portion (PP).

[0092] According to one embodiment, the polarizing portion (PP) may be positioned closer to the user's eye (E) than the first lens (L1) from the user's eye (E) among the plurality of lenses (e.g., L1, L2, L3) included in the lens assembly (LA), or may be positioned between at least two lenses. Referring to FIG. 5, the polarizing portion (PP) may be positioned between the first lens (L1) from the user's eye (E) (hereinafter, referred to as the 'first lens (L1)') and the second lens (L2) from the user's eye (E). However, the present invention is not limited thereto, and the position of the polarizing portion (PP) may be set in various ways depending on the embodiment. For example, the polarizing portion (PP) may be positioned between the two lenses (L2) from the user's eye (E) (hereinafter, referred to as the 'second lens (L2)') and the third lens (L3) from the user's eye (E) (hereinafter, referred to as the 'third lens (L3)'). In addition, various other embodiments can be applied. If the lens assembly (LA) includes a larger number of lenses than those illustrated in FIG. 5, embodiments other than the aforementioned embodiments can also be applied. For convenience of explanation, the following description will focus on an embodiment in which the polarizing portion (PP) is positioned between the first lens (L1) and the second lens (L2) as illustrated in FIG. 5. In the illustrated embodiment, the first lens (L1) of the wearable electronic device (400) or the lens assembly (LA) can be understood as a lens positioned farthest from the display (D) among a plurality of lenses (e.g., at least three lenses), or a lens positioned closest to the user's eye (E).

[0093] Referring to FIG. 5, the polarizer (401), the reflective polarizer (402), and the 1 / 4 wave plate (403) included in the polarizing unit (PP) may be sequentially arranged between the user's eye (E) and the display (D) along the direction in which the user's eye (E) looks at the display (D). According to the embodiment illustrated in FIG. 5, the polarizer (401) may be arranged on the display side of the first lens (L1), the 1 / 4 wave plate (403) may be arranged on the eye side of the second lens (L2), and the reflective polarizer (402) may be arranged between the polarizer (401) and the 1 / 4 wave plate (403). Here, the expression "a component is arranged on XX" may refer to being arranged adjacent to or substantially in contact with XX. For example, the polarizer (401) 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)).

[0094] According to one embodiment, the polarizer (401) and / or the reflective polarizer (402) may be configured in a film form. When the polarizer (401) and / or the reflective polarizer (402) are configured in a film form, the polarizer (401) and / or the reflective polarizer (402) may be laminated to each other. The polarizer (401) and / or the reflective polarizer (402) may be additionally laminated together with a quarter wave plate (403) to form a polarizing portion (PP), which may be attached to the first lens (L1) from the user's eye. Here, 'lamination' may mean that at least one of the two different members is provided with an adhesive and is bonded to each other.

[0095] According to one embodiment, when the polarizing portion (PP) is 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 polarizing portion (PP) can be implemented as a substantially flat surface.

[0096] A wearable electronic device (400) may include a beam splitter (404). The beam splitter (404) may be disposed on the display (D) side from the quarter wave plate (403). The beam splitter (404) may be disposed to be spaced apart from the quarter wave plate (403) by a predetermined distance. At least one lens may be disposed between the quarter wave plate (403) and the beam splitter (404). Referring to FIG. 5, the beam splitter (404) may be disposed on the display side surface of the second lens (L2).

[0097] According to one embodiment, a polarizing unit (PP) in the form of a laminated polarizer (401), a reflective polarizer (402), and a quarter-wave plate (403) may be thinner and have superior optical performance than a conventional polarizing film. According to one embodiment, the lens assembly (LA) and / or the polarizing unit (PP) included in the wearable electronic device (400) may additionally or alternatively include at least one anti-reflection (AR) layer (e.g., the anti-reflection layer (405) of FIG. 6, the anti-reflection layers (405, 405') of FIG. 13). The anti-reflection layer (e.g., the anti-reflection layer (405) of FIG. 6, the anti-reflection layers (405, 407) of FIG. 13) may have a configuration that transmits light but prevents light from being reflected.

[0098] Referring to FIG. 5, the polarizing portion (PP) is positioned closer to the user's eye (E) than the lens assembly (LA) to selectively transmit, reflect, and / or block light (e.g., light output from the display (D)) entering the user's eye. The beam splitter (404) may be configured to transmit a portion of the light output from the display (D) and incident on the beam splitter (404) and reflect another portion of the incident light. According to one embodiment, the beam splitter (404) may be configured as a translucent mirror, and for example, referring to FIG. 5, may be configured in the form of a mirror coated on one surface of the second lens (L2). Hereinafter, based on the functional aspect of light reflection, the reflective polarizer (402) may be referred to as a 'first reflective member', and the beam splitter (404) may be referred to as a 'second reflective member'.

[0099] In the following description, the direction from the user's eye (E) toward the display (D) may be referred to as a first direction (①), and the direction from the display (D) toward the user's eye (E) opposite to the first direction (①) may be referred to as a second direction (②). For example, the lens assembly (LA) may include a plurality of lenses (e.g., a first lens (L1), a second lens (L2), and a third lens (L3)) sequentially arranged along the first direction (①). In addition, for example, a polarizer (401), a reflective polarizer (402), and / or a quarter-wave plate (403) may be sequentially arranged along the first direction. In addition, for example, light may initially be output from the display (D) along the second direction (②). Here, the first direction (①) and the second direction (②) may be substantially parallel to the direction of propagation (DE) of the light.

[0100] In one embodiment, when the polarizing portion (PP) is disposed adjacent to (or in contact with) the nth lens (wherein 'n' is a natural number), the beam splitter (404) may be disposed on the n+1th lens adjacent to the nth lens. 'Disposed on the n+1th lens' may be understood as meaning that the beam splitter (404) is disposed adjacent to or in contact with any one of the surfaces of the n+1th lens. In one embodiment, the nth lens may be understood as the lens that is disposed farthest from the display (D) among the lenses (L1, L2, L3) of the lens assembly (LA), for example, the first lens (L1). When the nth lens corresponds to the first lens, the beam splitter (404) may be disposed on one surface (e.g., the display-side surface) of the second lens. The beam splitter (404) may be substantially attached to any one of the surfaces of the n+1th lens. According to one embodiment, the surface of the n-th lens on which the polarizing portion (PP) is disposed may be substantially flat. The surface of the n+1-th lens on which the beam splitter (404) is attached may be substantially flat, but may also be curved. As will be described later, when the polarizing portion (PP) including the first reflective member (e.g., reflective polarizer (402)) is disposed on the display-side surface of the first lens (L1), the second reflective member (e.g., beam splitter (404)) may be disposed on the display-side surface of the second lens (L2).

[0101] According to one embodiment, the arrangement of the polarizer (PP) and / or beam splitter (404) as described above can provide a good quality image while miniaturizing the optical system implemented with a limited number of lenses (e.g., at least three lenses). For example, by reducing the number of lenses (or the number of lens surfaces) arranged between the reflective polarizer (402) as the first reflective member and the beam splitter (404) 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.

[0102] In the embodiment of FIG. 5, the optical path from the display (D) to the user's eye (E) or the polarization state of light transmitted (or reflected) through the polarizing portion (PP) or beam splitter (404) is described. For the convenience of describing the optical path or polarization state, FIG. 5 shows that no other polarizing element is provided; however, the embodiment(s) of the present disclosure are not limited thereto, and other polarizing elements not shown in the drawing (e.g., other polarizers and / or other quarter-wave plates) may be additionally or alternatively arranged. This will be described in detail below with reference to the embodiment of FIG. 7.

[0103] FIG. 6 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.

[0104] FIG. 6 may represent a drawing in which an anti-reflection (AR) layer (405) is additionally provided in the embodiment illustrated in FIG. 5.

[0105] According to one embodiment, an anti-reflection layer (405) may be disposed between a quarter-wave plate (403) and a lens (e.g., a second lens (L2)) adjacent to a beam splitter (404). By reducing and / or preventing leakage of light traveling toward the quarter-wave plate (403) through the anti-reflection layer (405), the transmission efficiency (or luminance) of light output from the display (D) may be increased when transmitted to the user's eye (E).

[0106] FIG. 7 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.

[0107] FIG. 7 may show a drawing in which, in the embodiment illustrated in FIGS. 5 and 6, a polarizing unit (PP) including a polarizer (401), a reflective polarizer (402), and a quarter-wave plate (403) and another polarizing unit (PP) are additionally provided.

[0108] According to one embodiment, the wearable electronic device (400) may include another polarizing unit (PP) including a quarter wave plate (408) and a polarizer (409) in addition to a polarizing unit (PP) including a polarizer (401), a reflective polarizer (402), and a quarter wave plate (403). According to one embodiment, the polarizing unit (PP) including the polarizer (401), the reflective polarizer (402), and the quarter wave plate (403) may be referred to as a first polarizing unit (PP1), and the polarizing unit (PP) including the quarter wave plate (408) and the polarizer (409) may be referred to as a second polarizing unit (PP2). And, the polarizer (401) included in the first polarizing unit (PP1) may be referred to as the first polarizer (401), and the polarizer (409) included in the second polarizing unit (PP2) may be referred to as the second polarizer (409). The 1 / 4 wavelength plate (403) included in the first polarizing unit (PP1) may be referred to as the first 1 / 4 wavelength plate (403), and the 1 / 4 wavelength plate (408) included in the second polarizing unit (PP2) may be referred to as the second 1 / 4 wavelength plate (408).

[0109] According to one embodiment, the wearable electronic device (400) may include two polarizing elements, i.e., a first polarizing element (PP1) and a second polarizing element (PP2), wherein the optical elements may be arranged in the following order: the first polarizing element (PP1), at least one lens, a beam splitter (404), and the second polarizing element (PP2), for example, along a first direction.

[0110] According to one embodiment, the second polarizing portion (PP2) may additionally include an anti-reflection layer (407), and the anti-reflection layer (405) included in the first polarizing portion (PP1) may be referred to as a first anti-reflection layer (405), and the anti-reflection layer (407) included in the second polarizing portion (PP2) may be referred to as a second anti-reflection layer (407).

[0111] Referring to FIG. 7, the path of light movement in a wearable electronic device (400) according to one embodiment may be as follows. Since the anti-reflection layer (405, 407) is configured to prevent light from being reflected in a situation where light is transmitted, the description of the anti-reflection layer (405, 407) may be omitted in the following description of the path of light movement.

[0112] For convenience of explanation, information on the optical axis direction of the optical elements is described at the top of Fig. 7. Here, the 'optical axis direction' may mean the direction of the optic axis perpendicular to the light axis (DE). Fig. 7 may show one example among various embodiments regarding the optical axis direction. Regarding the optical axis direction in the embodiment of Fig. 7, if described sequentially along the path of light output from the display, the second polarizer (409) may be an optical element having an optical axis in the vertical direction (V), for example, and the second 1 / 4 wave plate (408) may be an optical element having an optical axis in the direction of +45 degrees relative to the fast axis, for example. The first 1 / 4 wave plate (403) may be an optical element having an optical axis in the direction of -45 degrees relative to the fast axis, for example. And the reflective polarizer (402) and polarizer (401) may be optical elements having an optical axis in the horizontal direction (H). However, it should be noted that the description of the optical axis direction described above is exemplary, and other embodiments may also be applied. Hereinafter, the behavior of light conversion according to the light movement path based on the optical axis direction illustrated in the embodiment of FIG. 7 will be described in detail.

[0113] The light (OL) output from the display (D) can reach the user's eye (E) after passing through the lens assembly (LA) and the polarizing portion (PP). The light (OL) output from the display (D) can sequentially pass through the second polarizer (409) and the second 1 / 4 wave plate (408) and then reach the beam splitter (404). At this time, the light (OL) output from the display (D) may be light that propagates while vibrating in various polarization directions (various vector directions). The light output from the display (D) can be converted into linear polarization while passing through the second polarizer (409). And, this linear polarization can be converted into circular polarization (right-handed polarization or left-handed circular polarization) while passing through the second 1 / 4 wave plate (408).

[0114] Light reaching the beam splitter (404) can pass through the beam splitter (404) and reach the first 1 / 4 wave plate (403). Circularly polarized light (right-handed polarization or left-handed polarization) among the light reaching the first 1 / 4 wave plate (403) can be converted into linearly polarized light by the first 1 / 4 wave plate (403) and reach the reflective polarizer (402). Until the light passing through the beam splitter (404) reaches the reflective polarizer (402), the light can move in the second direction (display (D) -> user's eye (E)). Among the linear polarizations that reach the reflective polarizer (402), linear polarization in one direction (e.g., vertical polarization (V(v,h)) in FIG. 7) is reflected by the reflective polarizer (402) and directed toward the 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 (403). At this time, among the linear polarizations that reach the reflective polarizer (402), linear polarization in another direction (e.g., horizontal polarization (H(v,h)) in FIG. 7) can pass through the reflective polarizer (402) as is. Circular polarization (right-hand circular polarization or left-hand circular polarization) that is converted by passing through the first 1 / 4 wave plate (403) can be reflected by the beam splitter (404) and directed toward the second direction again. When reflected by the beam splitter (404), the circular polarization (right-hand circular polarization or left-hand circular polarization) can be phase-converted (e.g., left-hand circular polarization -> right-hand circular polarization, right-hand circular polarization -> left-hand circular polarization). The phase-converted circular polarization can pass through the first 1 / 4 wave plate (403), the reflective polarizer (402), and the polarizer (401) along the second direction to reach the user's eye (E). At this time, the light passing through the first 1 / 4 wave plate (403) can be converted into linear polarization (e.g., horizontal polarization (H(v',h')) in FIG. 7) and can pass through the reflective polarizer (402) to reach the first polarizer (401). At this time, some light (h'') of the linear polarization (H(v',h')) can be reflected by the reflective polarizer (402).Light reaching the first polarizer (401) may have some polarization components (e.g., vertical component (v) in H(v,h) and vertical component (h') in H(v', h')) removed by the first polarizer (401), so that only some polarization components remain and reach the user's eye (E). However, the embodiment of FIG. 7 exemplarily mentions a change in the polarization state of light passing through a wearable electronic device (400) according to one embodiment, and it should be noted that the conversion of polarization components by the first polarizer (401), the reflective polarizer (402), the first 1 / 4 wave plate (403), the beam splitter (404), the second 1 / 4 wave plate (408) and / or the second polarizer (409) may be different from the mentioned embodiment.

[0115] The wearable electronic device (400) according to the embodiments of the above-described FIGS. 5 to 7 can have the effect of substantially reducing the total lens length while maintaining the focal length required for the lens assembly (maintaining the total length of the actual path along which light travels) by using a pancake lens structure, i.e., a lens assembly (LA) including a polarizing portion (PP). As mentioned above, the wearable electronic device (400) can reduce the total lens length by approximately 70% by using a pancake lens structure, i.e., a lens assembly (LA) including a polarizing portion (PP).

[0116] However, since the polarizers (401, 409) and / or reflective polarizers (402) included in the polarizing unit (PP) must transmit only some light and not transmit or reflect other light, they may need to have physical characteristics to distinguish the direction of light propagation. Typically, the physical characteristics of the polarizers (401, 409) and / or reflective polarizers (402) may be defined by an optical axis generated in the process of obtaining a polarizing film by stretching a base material such as PVA (polyvinyl alcohol). However, when stretching a base material such as PVA, wrinkles may occur on the surface of the polarizing film depending on the stretching direction. Therefore, the polarizers (401, 409) and / or reflective polarizers (402) may be referred to as factors causing wrinkles. For example, if both the polarizer (401, 409) and the reflective polarizer (402) included in the polarizing portion (PP) are formed by stretching a base material such as PVA as described above, films having different optical axes are laminated, and in this case, wrinkles in the polarizing film may be more noticeable.

[0117] When light is output from the display (D) to the wearable electronic device (400) including the polarizing portion (PP) with wrinkles as described above, image distortion due to the wrinkles may occur when the image or video is input to the user's eyes. This may cause a decrease in the resolution of the wearable electronic device (400). When comparing the peak value by measuring the modulation transfer function (MTF) curve for embodiments each including a lens assembly without the polarizing portion (PP) and a lens assembly with the polarizing portion (PP), it has been experimentally confirmed that when the lens assembly without the polarizing portion (PP) is at approximately 85%, the peak value can be lowered to approximately 50% for the lens assembly with the polarizing portion (PP).

[0118] To summarize the above, if a polarizing part (PP) is provided, the effect of reducing the lens length can be obtained, but the resolution and clarity of a lens assembly provided with a polarizing part (PP) may be reduced compared to a lens assembly without a polarizing part (PP).

[0119] In order to reduce and / or resolve the above-described problems, the present disclosure may provide a lens assembly (LA) further including a layer (406) referenced from the embodiments illustrated in FIGS. 8 to 10 below, and a wearable electronic device (400) including the same.

[0120] FIG. 8 illustrates a path along which light output from a display in a wearable electronic device according to a first embodiment of the present disclosure is focused or guided to a user's eye. FIG. 9 illustrates a path along which light output from a display is focused or guided to a user's eye in a wearable electronic device according to a second embodiment of the present disclosure. FIG. 10 illustrates a path along which light output from a display is focused or guided to a user's eye in a wearable electronic device according to a third embodiment of the present disclosure.

[0121] In the embodiment of FIG. 8 and below, the lens assembly (LA) and the wearable electronic device (400) including the same are illustrated as including only one polarizing unit (PP) (e.g., the first polarizing unit (PP1) of FIG. 7). According to one embodiment, the wearable electronic device (400) according to the embodiment of FIG. 8 and below may further include another polarizing unit (PP) (e.g., the second polarizing unit (PP2) of FIG. 7), but for the sake of convenience of explanation, the description related to the other polarizing unit (PP) (e.g., the second polarizing unit (PP2) of FIG. 7) may be omitted below. That is, in the description below, the description of the second polarizer (409), which is a wrinkle-causing element included in the other polarizing unit (PP) (e.g., the second polarizing unit (PP2) of FIG. 7), is omitted, and the description of the first polarizer (401) below may be applied as needed.

[0122] The wearable electronic device (400) of the present disclosure may additionally include a layer (406) in the pancake lens structure. Referring to FIGS. 8 to 10, the polarizing portion (PP) of the wearable electronic device (400) includes a polarizer (401), a reflective polarizer (402), and a quarter-wave plate (403) sequentially arranged from the user's eye (E) side toward the display (D) side (first direction), and may additionally include a layer (406) that is harder than the polarizer (401) and the reflective polarizer (402). Although the embodiment of FIGS. 8 to 10 illustrates an embodiment in which the layer (406) is additionally included in the wearable electronic device (400) illustrated in FIG. 5, the present invention is not necessarily limited thereto, and an embodiment in which the layer (406) is additionally included in the wearable electronic device (400) illustrated in FIG. 6 may also be applied. Additionally, the description related to the city of FIG. 7 can be applied to the embodiments of FIGS. 8 to 10 below.

[0123] According to the present disclosure, a wearable electronic device (400) can be provided that prevents image or video distortion and increases the resolution of an output image or video by improving wrinkles of a polarizing film by additionally providing a layer (406) to a polarizing portion (PP).

[0124] In the embodiment of FIG. 8 (hereinafter referred to as the “first embodiment”), a polarizer (401), a reflective polarizer (402), a layer (406), and a quarter-wave plate (403) may be arranged from the user’s eye (E) side toward the display (D) side (first direction). That is, in the embodiment of FIG. 8, the layer (406) may be arranged between the reflective polarizer (402) and the quarter-wave plate (403).

[0125] In the embodiment of FIG. 9 (hereinafter referred to as the “second embodiment”), a polarizer (401), a layer (406), a reflective polarizer (402), and a quarter-wave plate (403) may be arranged from the user’s eye (E) side toward the display (D) side (first direction). That is, in the embodiment of FIG. 9, the layer (406) may be arranged between the polarizer (401) and the reflective polarizer (402).

[0126] In the embodiment of FIG. 10 (hereinafter referred to as the “third embodiment”), the layer (406), the polarizer (401), the reflective polarizer (402), and the 1 / 4 wave plate (403) may be arranged from the user’s eye (E) side toward the display (D) side (first direction). That is, in the embodiment of FIG. 10, the layer (406) may be arranged at a position closer to the user’s eye (E) side than the polarizer (401).

[0127] In the embodiments of FIGS. 8 to 10, the polarizing portion (PP) including the layer (406) is shown to be arranged between the first lens (L1) and the second lens (L2), but is not necessarily limited thereto. According to one embodiment, the polarizing portion (PP) including the layer (406) may be arranged closer to the user's eye (E) than the first lens (L1), or may be arranged between the second lens (L2) and the third lens (L3). When the number of lenses is greater, other embodiments may also be applied, such as the polarizing portion (PP) including the layer (406) being arranged between the third lens (L3) and the fourth lens.

[0128] The layer (406) of the present disclosure can be used to alleviate, remove and / or prevent wrinkles in a wrinkle-causing element (e.g., polarizer (401) and / or reflective polarizer (402)) included in a polarizing member (PP).

[0129] According to one embodiment, the layer (406) may be composed of a material that is harder (has a higher hardness) than the wrinkle-causing elements (e.g., the polarizer (401) and / or the reflective polarizer (402)). Accordingly, the layer (406) may be referred to as a 'rigid layer (406)'. As an example, a material having a hardness of 6H or higher in pencil hardness may be applied as the layer (406). For example, the layer (406) may be formed using PET (polyethylene terephthalate) or PMMA (polymethyl methacrylate) as a base material. Since the PET may have a pencil hardness of 2 to 3H when hard coated, and the PMMA may have a pencil hardness of 6H when hard coated, PMMA may be more advantageous in terms of hardness.

[0130] In one embodiment, the layer (406) may be composed of a material having a modulus (or tensile modulus) greater than the wrinkle-causing element (e.g., polarizer (401) and / or reflective polarizer (402)). The PET may have a modulus of 2 to 2.7 GPA, and the PMMA may have a modulus of 2.9 GPA, so PMMA may be more advantageous in terms of modulus.

[0131] In another embodiment, the layer (406) may have low expansion coefficient characteristics. For example, as the layer (406), 10 -6 / °C [㎛ / m°C] may have a thermal expansion coefficient of less than 10. According to another embodiment, the layer (406) may be positioned between a plurality of lenses or may be positioned closer to the user's eyes than the lenses, and thus may be composed of a transparent material having a visible light transmittance of 90% or more. According to another embodiment, the layer (406) may have a refractive index of 1.5 or more. According to another embodiment, the layer (406) may be composed of a bendable material for performing a roll-based lamination process (hereinafter, referred to as a 'roll lamination process'), which will be described in detail below. According to another embodiment, the layer (406) may have a thickness of 100 ㎛ or less.

[0132] According to one embodiment, the layer (406) may be a very thin (e.g., about 100 μm or less) glass (TG; thin glass). As an example, the layer (406) may be implemented as a foldable and very thin (e.g., about 100 μm or less) glass (FTG; foldable thin glass). In addition, other embodiments may be applied as the material of the layer (406). For example, the layer (406) may be a very thin (e.g., about 100 μm or less) synthetic resin (TP; thin plastic). For example, the layer (406) may be formed by applying and / or depositing a hard coating solution on a soft layer having a very thin (e.g., about 100 μm or less) shape.

[0133] FIG. 11 is a drawing showing a laminated structure between a polarizing portion and lenses of a wearable electronic device according to one embodiment of the present disclosure.

[0134] The stacked structure between the polarizing portion (PP) and the lens(es) can be examined through Fig. 11. One lens (La) illustrated in Fig. 11 may be a lens that is positioned relatively close to the subject side (e.g., the user's eye side) among a plurality of lenses included in the lens assembly, and another lens (Lb) may be a lens that is positioned relatively close to the display side among a plurality of lenses included in the lens assembly. For example, one lens (La) may be a first lens, and the other lens (Lb) may be a second lens, but is not necessarily limited thereto.

[0135] Although Fig. 11 illustrates a case where a polarizing element (PP) is positioned between one lens (La) and another adjacent lens (Lb), this is not necessarily limited to the arrangement. For example, the polarizing element (PP) may be positioned closer to the subject (e.g., closer to the user's eye) than one lens (La).

[0136] Unlike the embodiments illustrated in FIGS. 8 to 10, FIG. 11 illustrates a laminated structure in which an anti-reflection layer (405') is additionally disposed closer to the subject side (e.g., the user's eye side) than the polarizer (401), and the anti-reflection layer (405) is disposed closer to the display side than the quarter-wave plate (403). According to one embodiment, the anti-reflection layers (405, 405') may be formed in the form of a film, but may alternatively be formed in the form of a coating layer coated on a lens. For example, the anti-reflection layer (405') disposed closer to the subject side (e.g., the user's eye side) than the polarizer (401) may be coated on one side (the subject-side side) of the lens (La) that is relatively close to the subject side (e.g., the user's eye side). As another example, an anti-reflection layer (405) positioned closer to the display side than the 1 / 4 wavelength plate (403) may be formed in a film form and may be laminated together with other components of the polarizing portion (PP).

[0137] Referring to FIG. 11, the polarizing portion (PP) may include a polarizer (401), a reflective polarizer (402), a layer (406), a quarter-wave plate (403), and an anti-reflection layer (405), all of which may be laminated. The laminated polarizing portion (PP) may be laminated to a lens (La, and / or Lb).

[0138] Fig. 12 is a drawing showing a polarizing part being combined according to various embodiments.

[0139] Fig. 12(a) may illustrate a state in which some elements of a polarizing unit (PP) are combined in an embodiment without a layer (406). Fig. 12(b) may illustrate a state in which some elements of a polarizing unit (PP) are combined in an embodiment with a layer (406). Figs. 12(a) and 12(b) may be conceptual diagrams that enlarge some elements of the polarizing unit (PP) of Fig. 10.

[0140] Figures 12(a) and 12(b) illustrate a polarizer (401), a reflective polarizer (402), and a 1 / 4 wave plate (403), respectively. Here, it can be explained by assuming that wrinkles are formed only in the reflective polarizer (402).

[0141] Referring to (a) of Fig. 12, when a polarizer (401), a reflective polarizer (402), and a quarter-wave plate (403) are laminated without a layer (406), the wrinkles of the reflective polarizer (402) in the laminated laminated structure may be visible to the outside as they are. The wrinkles of the reflective polarizer (402) in the laminated laminated structure may be a factor that distorts images or videos.

[0142] In contrast to (a) of FIG. 12, referring to (b) of FIG. 12, when the layer (406) is laminated together with the polarizer (401), the reflective polarizer (402), and the 1 / 4 wave plate (403), the wrinkles of the reflective polarizer (402) can be alleviated, eliminated, and / or prevented in the laminated laminated structure. Accordingly, in the case of (b) of FIG. 12, the influence of the wrinkles of the reflective polarizer (402) on the laminated laminated structure can be reduced, and thus the probability of distortion of the image or video can also be reduced, which can have the advantage of increasing the resolution.

[0143] Fig. 13 is a diagram showing the surface roughness and resolution of a combined polarizing element according to various embodiments. Fig. 14 is a diagram showing locations where the surface roughness is measured in two different directions centered on the optical axis.

[0144] The comparative example of Fig. 13 can show the surface roughness and resolution for a laminated polarizing portion, for example, as in (a) of Fig. 12. The present example of Fig. 13 can show the surface roughness and resolution for a laminated polarizing portion, for example, as in (b) of Fig. 12.

[0145] Referring to the comparative example of Fig. 13, when the laminated polarizing part is viewed in an enlarged manner, it can be confirmed that wrinkles are relatively clearly visible on the surface of the laminated polarizing part. Referring to the present example of Fig. 13, when the laminated polarizing part is viewed in an enlarged manner, it can be confirmed that wrinkles are almost absent on the surface of the laminated polarizing part.

[0146] Referring to FIGS. 13 and 14 together, the resolution can be measured in two different directions (sag (sagittal) direction and tan (tangential) direction) centered on the ray axis, and the measured results can be plotted as an MTF diagram. In the graph illustrated in FIG. 13, the solid line represents the sag direction, and the dotted line represents the tan direction MTF diagram. It can be confirmed that the peaks of the contrast values ​​appear in the sag direction and the tan direction approximately at the center of the ray axis. In the case of the comparative example of FIG. 13, the contrast values ​​at the MTF peaks in the sag direction and the tan direction are measured to be approximately 53% and 42%, respectively, and in the case of the present example of FIG. 13, the contrast values ​​at the MTF peaks in the sag direction and the tan direction are measured to be approximately 76% and 73%, respectively.

[0147] In the comparative example of Fig. 13, the brightness values ​​at the MTF peaks in the sag direction and the tan direction have a difference of approximately 13%. This significant difference in the brightness values ​​at the MTF peaks in the sag direction and the tan direction can be referred to as a peak value separation phenomenon. Compared to the comparative example of Fig. 13, in the case of this example, it can be confirmed that the peak value separation phenomenon is also significantly reduced to approximately 3% in the difference in the brightness values ​​at the MTF peaks in the sag direction and the tan direction.

[0148] Referring to FIGS. 12 to 14 together, it can be confirmed that the surface roughness of the combined polarizing part as in (b) of FIG. 12 is improved compared to the combined polarizing part as in (a) of FIG. 12, and the resolution is also significantly increased (23% increase in the sag direction, 31% increase in the tan direction).

[0149] Figure 15 is a drawing showing the assembly of a polarizing element combined with a lens into a lens barrel.

[0150] According to one embodiment, in the process of assembling the laminated polarizing portion (PP) together with the lens into the lens barrel (LB), a protective member (406') may be additionally provided at the edge of the layer (406) to prevent damage to the layer (406).

[0151] In one embodiment, the protective member (406') may be positioned between the layer (406) and the lens barrel (LB). In another embodiment, the protective member (406') may be positioned to circumferentially surround the periphery of the layer (406).

[0152] The protective member (406') may be formed of, for example, optical clear adhesive (OCA) or optical clear resin (OCR).

[0153] Hereinafter, a process for attaching a polarizing portion to a lens will be described with reference to the examples of FIGS. 16 and 17.

[0154] Fig. 16 is a drawing illustrating a process for attaching a polarizing element to a lens. Fig. 17 is a block diagram illustrating a process for attaching a polarizing element to a lens.

[0155] Referring to (a) of Fig. 16, the polarizing part (PP) may include a polarizer (401), a reflective polarizer (402), a layer (406), a quarter-wave plate (403), and an anti-reflection layer (405), and all of these components may be laminated. In addition, referring to (b) of Fig. 16, the laminated polarizing part (PP) may be processed (e.g., stamped) into a shape corresponding to a lens using a laser cutting device or a CNC machining device. In addition, referring to (c) of Fig. 16, the processed (e.g., stamped) polarizing part (PP) may be laminated to one surface of a lens (e.g., La) using a roller (R). Through the lamination process using the roller (R) (hereinafter, referred to as the 'roll lamination process'), the phenomenon of bubbles being generated and / or remaining between the lens and the film can be reduced and / or prevented.

[0156] The process of attaching a polarizing element to a lens is described in more detail with reference to Fig. 17.

[0157] Referring to operation 511 of the drawing (hereinafter simply referred to as 'operation 511'), a lamination process according to one embodiment may first prepare a wrinkle-causing element. In the present disclosure, the wrinkle-causing element may be, for example, a polarizer (401) and / or a reflective polarizer (402), which may be referred to as a 'polarizing film' for convenience hereinafter. The wrinkle-causing element prepared in operation 511 may be one of the polarizer (401) and / or the reflective polarizer (402). An optical axis may be formed in the wrinkle-causing element prepared in operation 511 due to stretching. For example, the optical axis formed in the wrinkle-causing element prepared in operation 511 may be parallel to the horizontal direction. According to one embodiment, an adhesive for lamination (e.g., OCA or OCR) may be attached to at least one surface of the wrinkle-causing element prepared in operation 511.

[0158] As an example of operation 511, when the reflective polarizer (402) is provided as the wrinkle-causing element, in operation 511, the reflective polarizer (402) may have an optical axis in one direction (e.g., horizontal direction) and an adhesive (e.g., OCA or OCR) may be applied. With respect to operation 512, a layer (406) having a high hardness and / or a high modulus may be laminated to the polarizing film stretched in the optical axis direction in operation 511. For example, when the reflective polarizer (402) is provided as the wrinkle-causing element in operation 511, in operation 512, the layer (406) may be laminated to the reflective polarizer (402).

[0159] In relation to operation 513, other components for forming a polarizing portion (PP) may be attached. For example, when the wrinkle-causing element in operation 511 is a reflective polarizer (402), in operation 513, a 1 / 4 wavelength plate (403) may be attached to the reflective polarizer (402).

[0160] In relation to operation 514, in the case where the reflective polarizer (402) is a 1 / 4 wave plate (403) in operation 513, for example, a protective film may be attached to one side of the 1 / 4 wave plate (403), and thus this may be removed.

[0161] In relation to operation 515, in addition to the preceding operations 511, 512, 513, and 514, an operation for forming an anti-reflection layer (405, 405') may be performed. However, operation 515 may be performed at any stage before, during, or after the preceding operations 511, 512, 513, and 514.

[0162] And, an annealing process can be performed while the polarizing part (PP) is laminated. The annealing process is a heat treatment method of heating the object to a predetermined temperature and then slowly cooling it, and in the present disclosure, it can be performed to increase the adhesion between the components of the laminated polarizing part (PP). For example, a method can be performed in which the laminated polarizing part (PP) is heated at a temperature of 80°C or higher for 2 hours or more and then slowly cooled.

[0163] In relation to operation 516, a process of additionally laminating a polarizer (401) may be performed. Here, the polarizer (401) may also be a wrinkle-causing element elongated in one direction (e.g., vertically). Although not illustrated in the drawing, an annealing process may be additionally performed after the laminating process of operation 516.

[0164] With respect to operations 517 and 518, the laminated polarizing portion (PP) can be processed using a laser cutting device or a CNC machining device, and the polarizing portion (PP) can be processed to correspond to the shape of the lens. The polarizing portion (PP) processed to correspond to the shape of the lens can be laminated to a lens (e.g., La) using the roller (R) described above in FIG. 16 (c).

[0165] According to one embodiment, between the processes included in FIGS. 16 and 17, a chemical treatment process (e.g., autoclave) at high temperature and high pressure may be additionally performed.

[0166] Hereinafter, with reference to FIGS. 18 and 19, the peak value of the MTF diagram according to various embodiments and the performance according to the position of the layer (406) in the polarizing portion (PP) can be compared with reference to the surface roughness.

[0167] Fig. 18 is a diagram illustrating the combined structure of a lens and a polarizer according to various embodiments, as well as the MTF peak curve and surface roughness. Fig. 19 is a diagram conceptually comparing the first, second, and third embodiments of the present disclosure.

[0168] FIG. 18 shows peak values ​​of MTF diagrams and surface roughness for the first embodiment, the second embodiment, and the third embodiment corresponding to the present embodiment of FIG. 13, along with comparative examples corresponding to the comparative example of FIG. 13.

[0169] The wearable electronic device illustrated in FIGS. 18 and 19 may include a lens (La), a polarizer (601), a reflective polarizer (602), a quarter-wave plate (603), and an anti-reflection layer (605). When describing the embodiments illustrated in FIGS. 18 and 19, the description thereof may be omitted to the extent that it overlaps with the above-described embodiments. For example, other lens(es) and beam splitters in the above-described embodiments are omitted and illustrated. However, the present invention is not limited thereto, and for example, as illustrated in FIG. 18, the wearable electronic device may additionally include an anti-reflection layer (605).

[0170] Referring to FIGS. 18 and 19 together, the first embodiment may show a state in which a layer (606) is attached to a side of the reflective polarizer (602) facing the display (D) side. The second embodiment may show a state in which a layer (606) is attached to a side of the reflective polarizer (602) facing the user's eye (E) side and between the reflective polarizer (602) and the polarizer (601). The third embodiment may show a state in which a layer (606) is attached to a side of the polarizer (601) facing the user's eye (E) side.

[0171] Referring to Fig. 18, the surface roughness of the comparative example can be confirmed that wrinkles are relatively clearly visible on the surface of the laminated polarizing part when the laminated polarizing part is viewed in an enlarged manner. On the other hand, the surface roughness of the first, second, and third embodiments of Fig. 18 can be confirmed that wrinkles are almost non-existent on the surface of the laminated polarizing part when the laminated polarizing part is viewed in an enlarged manner.

[0172] Similar to FIG. 13, FIG. 18 also shows MTF diagrams measuring resolution in two different directions (sag (sagittal) direction and tan (tangential) direction) centered on the ray axis. In the graph illustrated in FIG. 18, the solid line represents the MTF diagram in the sag direction, and the dotted line represents the MTF diagram in the tan direction. It can be confirmed that the peaks of the contrast values ​​appear in the sag direction and the tan direction approximately at the center of the optical axis. In the case of the comparative example of FIG. 18, it can be confirmed that the contrast values ​​at the MTF peaks in the sag direction and the tan direction are measured to be approximately 53% and 42%, respectively. In the case of the first embodiment of FIG. 18, it can be confirmed that the contrast values ​​at the MTF peaks in the sag direction and the tan direction are measured to be approximately 65% ​​and 68%, respectively. In the case of the second embodiment of Fig. 18, it can be confirmed that the brightness values ​​at the MTF peaks in the sag direction and the tan direction are measured to be approximately 76% and 73%, respectively. In the case of the third embodiment of Fig. 18, it can be confirmed that the brightness values ​​at the MTF peaks in the sag direction and the tan direction are measured to be approximately 68% and 72%, respectively.

[0173] Referring to FIGS. 18 and 19, comparing the first embodiment, the second embodiment, and the third embodiment corresponding to the present embodiment, it can be confirmed that in the case of the first embodiment, the deviation of the intensity value at the MTF peak in the sag direction and the tan direction increases as the distance from the center of the optical axis increases, but in the case of the second and third embodiments, it can be confirmed that the deviation of the intensity value at the MTF peak in the sag direction and the tan direction is almost constant. When examining these results, it can be confirmed that the second and third embodiments have a more advantageous effect than the first embodiment in terms of resolution.

[0174] Referring to FIG. 19, in the case of the first embodiment, since the layer (606) and the polarizer (601) are spaced apart, the effect of alleviating, removing, and / or preventing wrinkles in the polarizer (601) through lamination between the polarizer (601) and the reflective polarizer (602) may be less than in the second embodiment. Similarly, in the case of the third embodiment, since the layer (606) and the reflective polarizer (602) are spaced apart, the effect of alleviating, removing, and / or preventing wrinkles in the polarizer (601) through lamination between the polarizer (601) and the reflective polarizer (602) may be less than in the second embodiment. In terms of the wrinkle improvement effect, among the first, second, and third embodiments, the second embodiment may exhibit the most remarkable effect.

[0175] 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.

[0176] 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.

[0177] 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).

[0178] 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.

[0179] 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.

[0180] 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.

[0181] According to one embodiment of the present disclosure, in a lens assembly (LA), at least three lenses; And a polarization part (PP) including a polarizer (401, 601), a reflective polarizer (402, 602), a quarter-wave plate (403, 603) and a beam splitter (404) sequentially arranged along a first direction, wherein the polarizer (401, 601), the reflective polarizer (402, 602) and the quarter-wave plate (403, 603) are arranged spaced apart from the beam splitter (404) with at least one lens among the at least three lenses interposed therebetween, and the polarization part (PP) includes a layer (406, 606) that is harder than the polarizer (401, 601) and the reflective polarizer (402, 602).

[0182] In one embodiment, the lens assembly may be of the pancake lens type.

[0183] According to one embodiment, the polarizers (401, 601) and the reflective polarizers (402, 602) may be elongated to have optical axes in different directions.

[0184] According to one embodiment, the polarizing unit (PP) may include a first polarizing unit (PP1) including a first polarizer (401, 601), a first reflective polarizer (402, 602), and a first 1 / 4 wave plate (403, 603), and a second polarizing unit (PP2) including a second 1 / 4 wave plate (408) and a second polarizer (409).

[0185] According to one embodiment, the polarizing member (PP) may be positioned between two adjacent lenses among the at least three lenses.

[0186] In one embodiment, the layer (406, 606) may be positioned closer to the user's eye side than the polarizer.

[0187] According to one embodiment, the layer (406, 606) may be positioned between the polarizer (401, 601) and the reflective polarizer (402, 602).

[0188] In one embodiment, the layer may be positioned between the reflective polarizer and the quarter wave plate.

[0189] In one embodiment, the layer may be a layer having a modulus greater than that of the polarizer and the reflective polarizer.

[0190] According to one embodiment, the layer may be formed of a transparent material having a visible light transmittance of 90% or more.

[0191] In one embodiment, at least a portion of the layer may be bendable.

[0192] In one embodiment, the layer may have a refractive index of 1.5 or greater.

[0193] According to one embodiment, the process for manufacturing the polarizing member may include a process for annealing the laminated polarizing member.

[0194] In one embodiment, the layer may have a thickness of 100 μm or less. The layer may be formed by applying and / or depositing a hard coating liquid on a thin glass (TG), foldable thin glass (FTG), thin synthetic resin (TP), polyethylene terephthalate (PET), or polymethyl methacrylate (PMMA) and / or a soft layer.

[0195] According to one embodiment, a wearable electronic device can be provided that includes the lens assembly (LA) and a display (D) that irradiates light toward the eye side (E; eye) of a user.

[0196] According to one embodiment of the present disclosure, in a lens assembly (LA), at least three lenses; And a polarization part (PP) including a polarizer (401, 601), a reflective polarizer (402, 602), a quarter-wave plate (403, 603) and a beam splitter (404) sequentially arranged along a first direction, wherein the polarizer (401, 601), the reflective polarizer (402, 602) and the quarter-wave plate (403, 603) are arranged spaced apart from the beam splitter (404) with at least one lens among the at least three lenses interposed therebetween, and the polarization part (PP) may include a polarization part (PP; polarization part); including a layer (406, 606) having a larger modulus than the polarizer (401, 601) and the reflective polarizer (402, 602).

[0197] According to one embodiment, the process for manufacturing the polarizing member may include a process for annealing the laminated polarizing member.

[0198] In one embodiment, the layer may have a thickness of 100 μm or less. The layer may be formed by applying and / or depositing a hard coating liquid on a thin glass (TG), foldable thin glass (FTG), thin synthetic resin (TP), polyethylene terephthalate (PET), or polymethyl methacrylate (PMMA) and / or a soft layer.

[0199] According to one embodiment of the present disclosure, in a wearable electronic device (400), at least three lenses are arranged between a user's eye (E) side and a display (D) side and are aligned along a ray axis (O); And a polarization part (PP) including a polarizer (401, 601), a reflective polarizer (402, 602), a quarter-wave plate (403, 603) and a beam splitter (404) sequentially arranged along a first direction, wherein the polarizer (401, 601), the reflective polarizer (402, 602) and the quarter-wave plate (403, 603) are arranged spaced apart from the beam splitter (404) with at least one lens among the at least three lenses interposed therebetween, and a polarization part (PP) including a rigid layer (406, 606) arranged between the polarizer and the reflective polarizer.

[0200] In one embodiment, the lens assembly may be of the pancake lens type.

[0201] While this disclosure has been described by way of example and illustration, it should be understood that these various embodiments are 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 the lens assembly (LA; lens assembly), At least 3 lenses; and A polarization part (PP) including a polarizer (401, 601), a reflective polarizer (402, 602), a quarter-wave plate (403, 603) and a beam splitter (404) sequentially arranged along a first direction, wherein the polarizer (401, 601), the reflective polarizer (402, 602) and the quarter-wave plate (403, 603) are arranged spaced apart from the beam splitter (404) with at least one lens among the at least three lenses interposed therebetween, A lens assembly including a polarization part (PP) including a layer (406, 606) harder than the polarizer (401, 601) and the reflective polarizer (402, 602).

2. In paragraph 1, The above lens assembly is a pancake lens type lens assembly.

3. In paragraph 1 or 2, A lens assembly in which the polarizer (401, 601) and the reflective polarizer (402, 602) are each elongated and have optical axes in different directions.

4. In any one of paragraphs 1 to 3, The above polarizing part (PP) comprises a first polarizing part (PP1) including a first polarizer (401, 601), a first reflective polarizer (402, 602), and a first 1 / 4 wave plate (403, 603). A lens assembly including a second polarizing unit (PP2) including a second 1 / 4 wave plate (408) and a second polarizer (409).

5. In any one of paragraphs 1 to 4, A lens assembly in which the above polarizing member (PP) is positioned between two adjacent lenses among the at least three lenses.

6. In any one of paragraphs 1 to 5, The above layer (406, 606) is a lens assembly positioned closer to the user's eye side than the above polarizer.

7. In any one of paragraphs 1 to 6, The above layer (406, 606) is a lens assembly positioned between the polarizer (401, 601) and the reflective polarizer (402, 602).

8. In any one of paragraphs 1 to 7, The above layer is a lens assembly positioned between the reflective polarizer and the quarter wave plate.

9. In any one of paragraphs 1 to 8, A lens assembly wherein the above layer is a layer having a modulus greater than that of the polarizer and the reflective polarizer.

10. In any one of paragraphs 1 to 9, The above layer is a lens assembly formed of a transparent material having a visible light transmittance of 90% or more.

11. In any one of paragraphs 1 to 10, The above layer is a lens assembly at least partially bendable.

12. In any one of paragraphs 1 to 11, The above layer is a lens assembly having a refractive index of 1.5 or greater.

13. In any one of paragraphs 1 to 12, A lens assembly, wherein the process for manufacturing the polarizing part includes a process for annealing the laminated polarizing part.

14. In any one of paragraphs 1 to 13, The above layer has a thickness of 100㎛ or less, A lens assembly formed by applying and / or depositing a hard coating liquid on a thin glass (TG), foldable thin glass (FTG), thin synthetic resin (TP), polyethylene terephthalate (PET), or polymethyl methacrylate (PMMA) and / or a soft layer.

15. A wearable electronic device comprising a lens assembly (LA) according to any one of claims 1 to 14 and a display (D) for irradiating light toward a user's eye side (E; eye).

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