Wearable electronic device including lens assembly

Abstract

A wearable electronic device according to one embodiment of the present invention includes at least four lenses aligned along an optical axis from an eye side of a user toward a display, where the at least four lenses include a first lens and a second lens arranged in order according to a distance from the display. The first lens includes at least one plane, and a first quarter-wave plate (QWP) and a first reflective member are disposed on the at least one plane. The second lens includes at least one convex surface, and the second reflective member may be disposed on the convex surface.

Description

Technical Field

[0001] The present disclosure relates to a wearable electronic device including a lens assembly. Background Art

[0002] Portable electronic devices such as electronic schedulers, portable multimedia players, mobile communication terminals, tablet personal computers (PCs), etc. are generally equipped with display members and batteries. However, in order to accommodate the display or the battery, the shape of the portable electronic device may be limited to a stick, clamshell, or slidable shape. As display members and batteries are made smaller and have enhanced performance, electronic devices that can be placed on the user's wrist, head, or other body parts (hereinafter, "wearable electronic devices") are emerging.

[0003] Examples of wearable electronic devices include head-mounted wearable devices (HMDs), smart glasses, smart watches (or bands), contact lens-type devices, ring-type devices, clothing / shoes / glove-type devices, etc. Such body-worn electronic devices can be easily carried and can enhance user accessibility.

[0004] For the purpose of assisting understanding of the present disclosure, the above information may be provided as related art. No statement or determination is made as to whether any of the foregoing is applicable as background art related to the present disclosure. Summary of the invention

[0005] Means of solving the problem

[0006] According to an embodiment, a wearable electronic device includes: at least four lenses arranged along an optical axis from an eye side of a user to a display, the at least four lenses including a first lens and a second lens; wherein the first lens is closest to the eye side of the user among the at least four lenses, and includes at least one flat surface and a first quarter wave plate (QWP) and a first refractive member disposed on the at least one flat surface, wherein, viewed from the eye side of the user, the second lens includes at least one convex surface and a second refractive member disposed on the at least one convex surface, and wherein the wearable electronic device satisfies the following formulas 1 and 2,

[0007] [Formula 1]

[0008] M12≥0.99

[0009] [Formula 2]

[0010] TTL / ImgH≤1.75

[0011] (where M12 is the combined group magnification of the first and second lenses, TTL is the “total top length” indicating the distance between the eye-side surface of the first lens and the display, and ImgH is the maximum image height of the display).

[0012] According to an embodiment, a wearable electronic device includes: a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along an optical axis direction from an eye side of a user to a display; wherein the first lens includes a substantially flat surface laminated with a first quarter wave plate and a reflective polarizer on the substantially flat surface, wherein the second lens includes at least one convex surface on which a beam splitter is formed, wherein the second quarter wave plate and the polarizer are formed on a display side surface of the fourth lens, wherein the first lens and the second lens are configured to move in the optical axis direction, and wherein the wearable electronic device satisfies the following formulas 1 and 2,

[0013] [Formula 1]

[0014] M12≥0.99

[0015] [Formula 2]

[0016] TTL / ImgH≤1.75

[0017] (where M12 is the combined group magnification of the first lens and the second lens, TTL is the “total top length” indicating the distance between the eye-side surface of the first lens and the display, and ImgH is the maximum image height of the display). BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The foregoing and other aspects, configurations and / or advantages of embodiments of the present disclosure will become more apparent from the following detailed description in conjunction with the accompanying drawings.

[0019] Figure 1 is a view showing a wearable electronic device according to an embodiment;

[0020] Figure 2A is a front view showing a wearable electronic device according to an embodiment of the present disclosure;

[0021] Figure 2B is a rear view showing a wearable electronic device according to an embodiment of the present disclosure;

[0022] Figure 3 shows a state in which light output from a display is delivered to a user's eyes according to an embodiment of the present disclosure;

[0023] Figure 4 is a view showing a lens assembly according to an embodiment;

[0024] Figure 5is a view showing a lens assembly according to an embodiment;

[0025] Fig. 6A is a graph showing spherical aberration of a lens assembly according to an embodiment;

[0026] Figure 6B is a graph showing astigmatism of a lens assembly according to an embodiment;

[0027] Figure 6C is a graph showing distortion of a lens assembly according to an embodiment;

[0028] Fig. 7A is a graph showing spherical aberration of a lens assembly according to an embodiment;

[0029] Figure 7B is a graph showing astigmatism of a lens assembly according to an embodiment;

[0030] Figure 7C is a graph showing astigmatism of a lens assembly according to an embodiment;

[0031] Figure 8 is a view showing a lens assembly according to an embodiment;

[0032] Fig. 9 is a view showing a lens assembly according to an embodiment;

[0033] Fig. 10A is a graph showing spherical aberration of a lens assembly according to an embodiment;

[0034] Fig. 10B is a graph showing astigmatism of a lens assembly according to an embodiment;

[0035] Fig. 10C is a graph showing distortion of a lens assembly according to an embodiment;

[0036] Fig.11A is a graph showing spherical aberration of a lens assembly according to an embodiment;

[0037] Fig. 11B is a graph showing astigmatism of a lens assembly according to an embodiment;

[0038] Fig. 11C is a graph showing astigmatism of a lens assembly according to an embodiment;

[0039] Fig.12 is a block diagram illustrating an electronic device in a network environment according to various embodiments; and

[0040] Fig.13 is a block diagram illustrating an example of a camera module according to various embodiments. DETAILED DESCRIPTION

[0041] Conventionally, head-mounted wearable devices are configured using a single lens, but it may be difficult to implement vision correction functions. In some cases, multiple lenses (e.g., three or less lenses) are used, but it may be difficult to achieve slimness.

[0042] The objects of the present disclosure are not limited to the foregoing, and other unmentioned objects will be apparent to those of ordinary skill in the art from the following description.

[0043] Figure 1 A wearable electronic device according to an embodiment of the present disclosure is shown.

[0044] Although some numbers are presented in describing the embodiments of the present disclosure, it should be noted that these numbers do not limit the embodiments of the present disclosure as long as these numbers are not stated in the claims.

[0045] refer to Figure 1 , the wearable electronic device 100 may be a glasses-type electronic device. The user may visually identify objects or environments around it while wearing the wearable electronic device 100. The wearable electronic device 100 may use a camera to obtain and / or identify a visual image of an environment or object in the direction in which the wearable electronic device 100 is pointed. The user views and receives information about an object or environment from an external electronic device through a network. The wearable electronic device 100 may provide the received object or environment-related information as audio information and / or visual information. For example, the wearable electronic device 100 may provide the received object or environment-related information to the user in a visual form through a display member. By implementing information about an object or environment in a visual form and combining them with a real image (or video) of the user's surrounding environment, the wearable electronic device 100 may implement augmented reality (AR), virtual reality (VR), mixed reality (MR) and / or extended reality (XR). The display member may output a screen in which an augmented reality object is added to an actual image (or video) of the environment around the user, thereby providing information about surrounding objects or the environment to the user.

[0046] In the following detailed description, “a state or position in which the electronic device or a designated component of the electronic device faces the user's face” may be referred to in various ways, and it should be noted that this assumes that the user is wearing the wearable electronic device 100 .

[0047] The wearable electronic device 100 may include at least one display member, a lens frame, and a wearing member. When the wearable electronic device 100 is worn on the user's body, a pair of display members including a first display member and a second display member may be positioned to correspond to the user's right eye and left eye, respectively. In an embodiment, the wearable electronic device 100 may have a shell shape (e.g., a goggle shape) including one display member corresponding to the right eye and the left eye.

[0048] The display component is a component for providing visual information to the user. The display component may include, for example, a lens assembly, a display D, and at least one sensor. Here, the lens assembly and the display D may each be formed to be transparent or translucent. However, the display component is not limited thereto. As another example, the display component may include a window component, which may be a semi-mother glass or a component capable of adjusting its transmittance according to the tinting concentration. As another example, the display component may include a reflective lens or a lens including a waveguide. An image output from a light output device (e.g., a projector) may be formed on each lens to provide visual information to the user. For example, a display component may mean a display that may include a waveguide (e.g., an optical waveguide) in at least a portion of each lens and transmit an image (or light) output from the light output device to the user's eyes through the waveguide included in the display component, while transmitting the real world to the user's eyes through the area in a perspective manner. The lens assembly (e.g., Figures 4 to 11C The lens assembly 200 or 300 ) is a component including a plurality of lenses (eg, L1 , L2 , L3 , and L4 ) and is disposed to be aligned with the optical axis OI in a space inside the wearable electronic device 100 .

[0049] Figure 2A is a front view showing a wearable electronic device according to an embodiment of the present disclosure. Figure 2B is a rear view showing a wearable electronic device according to an embodiment of the present disclosure.

[0050] As an embodiment, the electronic device 100 may be AR glasses or video see-through (VST) type VR glasses. In an embodiment, the VST type VR glasses may capture the external environment through a camera (not shown) and display the captured external environment image and VR content to the user through a display D. For example, the VR content may be content such as navigation or data related to a specific object.

[0051] refer to Figure 2A and 2BIn an embodiment, camera modules 111, 112, 113, 114, 115 and 116 and / or a depth sensor 117 may be disposed on the first surface 110 of the housing. The camera modules 111, 112, 113, 114, 115 and 116 and the depth sensor 117 may obtain information related to the surrounding environment. In some embodiments, the depth sensor 117 may detect the depth of an object by emitting infrared light and receiving reflected infrared light. In some embodiments, the depth sensor 117 may be omitted. The depth of an object may be detected using stereoscopic vision based on images of two or more of the camera modules 111, 112, 113, 114, 115 and 116 and their corresponding positions.

[0052] In an embodiment, the camera modules 111 and 112 may obtain images related to the surrounding environment of the wearable electronic device.

[0053] In an embodiment, camera modules 113, 114, 115, and 116 may obtain images when a user wears a wearable electronic device. Camera modules 113, 114, 115, and 116 may be used for hand detection, tracking, and recognition of user gestures (e.g., hand movements). Camera modules 113, 114, 115, and 116 may be used for 3-degree-of-freedom (DoF) or 6DoF head tracking, position (spatial or environmental) recognition, and / or movement recognition. In an embodiment, camera modules 111 and 112 may be used for hand detection and tracking and recognition of user gestures.

[0054] In an embodiment, the depth sensor 117 may be configured to transmit a signal and receive a signal reflected from an object and used to identify a distance to the object, such as time of flight (TOF).

[0055] Camera modules 125 and 126 and / or a display 121 (and / or a lens) for facial recognition may be provided on the second surface 120 of the housing.

[0056] Facial recognition camera modules 125 and 126 adjacent to the display may be used to recognize the user's face, or may recognize and / or track the user's eyes.

[0057] The display 121 (and / or the lens) may be disposed on the second surface 120 of the wearable electronic device 100. In an embodiment, the wearable electronic device 100 may not include the camera modules 115 and 116 of the plurality of camera modules 113, 114, 115, and 116. The wearable electronic device 100 may omit Figure 2A and Figure 2B For example, the wearable electronic device 100 may omit at least one of the camera modules, or may include more camera modules.

[0058] As described above, according to an embodiment, the wearable electronic device 100 may be shaped to facilitate wearing on the user's head. The wearable electronic device 100 may also include a strap and / or a wearing member fixed to a body part of the user. The wearable electronic device 100 may provide a user experience based on augmented reality, virtual reality, and / or mixed reality when worn on the user's head.

[0059] Figure 3 1 shows light output from a display D and transmitted to a user's eye according to an embodiment of the present disclosure. The wearable electronic device 100 includes a lens assembly 200. The lens assembly 200 includes lenses L1, L2, L3, and L4. The first lens (from the user's eye side) L1 includes at least one quarter wave plate 103, and the second lens L2 includes at least one refractive member 104. The focal length of the lens assembly can be adjusted by adjusting the optical path of the incident light.

[0060] The wearable electronic device 100 of the present disclosure may include a lens assembly 200, at least one quarter wave plate (QWP), at least one reflective polarizer (RP), and at least one beam splitter. The wearable electronic device 100 of the present disclosure can provide a user with a vision correction function by adjusting the diopter when at least some of the lenses are movable, and at least one quarter wave plate (QWP), at least one reflective polarizer (RP), and at least one beam splitter are provided to extend and / or adjust the length of the optical path of light, adjust the focal length, or improve the quality of the output image. Figure 4 The embodiments and subsequent views describe in detail the lens assembly 200, and describe in detail other components included in the wearable electronic device 100, such as at least one quarter wave plate (QWP), at least one reflective polarizer (RP), and at least one beam splitter.

[0061] If a wearable electronic device (e.g., AR / VR glasses) has a fixed focal length, it may be difficult to correct refractive errors (e.g., eye refraction due to eye diseases such as presbyopia, myopia, or hyperopia) by the system (e.g., AR / VR system) itself. Therefore, the resolution of the virtual image output may be limited. In contrast, the wearable electronic device 100 of the present disclosure realizes displaying virtual images at various focal lengths by extending the optical path of the incident light. The foregoing makes it possible to correct vision and improve image resolution.

[0062] The wearable electronic device 100 of the present disclosure may be an optical device (e.g., AR / VR glasses) that constitutes an optical system by being installed together with a lens assembly 200. The lens assembly 200 may include a display D and a plurality of lenses. Here, the lens assembly 200 may include a plurality of (e.g., four) lenses (e.g., L1, L2, L3, and L4). The display D may include a screen display area that exposes visual information to a portion corresponding to the user's eyes when the user wears the wearable electronic device 100. The display D may include, for example, a liquid crystal display (LCD), a light emitting diode (LED) display, an organic light emitting diode (OLED) display, or a microelectromechanical system (MEMS) display or an electronic paper display. The display D may display, for example, various contents (e.g., text, images, videos, icons, or symbols) to the user.

[0063] According to an embodiment, before various contents (e.g., text, images, videos, icons, or symbols) are delivered to a user through the display D, light output through the display D may pass through at least one quarter wave plate, at least one reflective polarizer, and at least one beam splitter, and then pass through the lens assembly 200. The order in which the light passes through at least one quarter wave plate, at least one reflective polarizer, and at least one beam splitter, and the lens assembly 200 may be set to vary. According to an embodiment of the present disclosure, the quarter wave plate and the reflective polarizer may be set to be adjacent to at least one of the two surfaces of the first lens L1 (hereinafter, referred to as "first lens L1") of the user's eye from the lens assembly 200, and the beam splitter may be set to be adjacent to the display side surface of the second lens L2 (hereinafter, referred to as "second lens L2") of the user's eye from the lens assembly 200.

[0064] Figure 3 It is shown that the quarter wave plate 103 and the reflective polarizer 102 are disposed adjacent to the surface of the first lens L1 on the user's eye side. The beam splitter 104 is disposed adjacent to the display-side surface of the second lens L2. The reflective polarizer 102 may be configured in the form of a film, and laminated with the quarter wave plate 103 to form a first film portion F1, and attached to the first lens L1 from the user's eye. Here, "lamination" may mean that two different components are bonded by an adhesive provided on at least one of the two components. The first film portion F1 in the laminated form of the quarter wave plate 103 and the reflective polarizer 102 may be thinner and provide better optical characteristics than when they are not laminated but simply stacked on each other.

[0065] like Figure 3As shown, the first film portion F1 may further include at least one polarizing film (eg, first polarizer 101) provided separately. Additionally or alternatively, the first film portion F1 may further include at least one anti-reflection (AR) film (not shown). Figure 3 , the first film portion F1 can be disposed near the user's eyes relative to the lens assembly 200, thereby selectively transmitting, reflecting and / or blocking light reaching the user's eyes. The beam splitter 104 can be disposed between the lenses of the lens assembly 200 (e.g., the second lens L2 and the third lens L3). The beam splitter 104 can be configured to transmit a portion of the light while reflecting another portion of the light. For example, the beam splitter 104 can be configured to transmit 50% of the light and reflect 50% of the light. Figure 3 The state in which the beam splitter 104 transmits 50% of the light may be shown. According to an embodiment, the beam splitter 104 may be composed of a semi-transparent mirror and coated on one surface of the second lens L2. Hereinafter, based on the functional aspect of light reflection, the reflective polarizer 102 may be referred to as a "first refractive member 102", and the beam splitter 104 may be referred to as a "second refractive member 104".

[0066] In the following description, the direction from the user's eyes to the display D may be referred to as a first direction, and the direction from the display D to the user's eyes may be referred to as a second direction. Both the first direction and the second direction may be parallel to the optical axis OI. The lens assembly 200 may include a plurality of lenses (e.g., a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4) sequentially arranged along the first direction.

[0067] The wearable electronic device 100 may include a second film portion F2. The second film portion F2 is disposed at a position farther away from the user's eyes than the lens assembly 200. Therefore, the second film portion F2 can selectively transmit, reflect and / or block light reaching the lens assembly 200. Here, the second film portion F2 may include a quarter wave plate 105 and a polarizer 106. The second film portion F2 may also be provided in a laminated form of a quarter wave plate 105 and a polarizer 106. In order to distinguish the components, the quarter wave plate 103 of the first film portion F1 may be referred to as a first quarter wave plate 103, and the quarter wave plate 105 of the second film portion F2 may be referred to as a second quarter wave plate 105. In addition, in order to distinguish it from the first polarizer 101 included in the first film portion F1, the polarizer 106 of the second film portion F2 may be referred to as a second polarizer 106.

[0068] Light from display D passes through second polarizer 106 and quarter wave plate 105. Second polarizer 106 allows vertically polarized light to pass through and blocks horizontally polarized light. Second quarter wave plate 105 can convert light into circularly polarized light that passes through lens assembly 200, which includes beam splitter 104 and first quarter wave plate 103. Reflective polarizer 102 can reflect light to first quarter wave plate 103. Beam splitter 104 can reflect light back to first quarter wave plate 103. Light that passes through first quarter wave plate 103 passes through reflective polarizer 102 and first polarizer 101. Light that passes through first polarizer 101 reaches the user's eyes.

[0069] refer to Figure 3 , the wearable electronic device 100 can operate as follows. The light output from the display D can pass through the second film portion F2, the lens assembly 200, and the first film portion F1, and then reach the user's eyes. In this case, the second polarizer 106 of the second film portion F2 can transmit the first linear polarized light, such as vertically polarized light (or p-polarized light), but does not transmit the second linear polarized light, such as horizontally polarized light (or s-polarized light). In other words, in the light reaching the second polarizer 106, only vertically polarized light (or p-polarized light) can be transmitted. The light transmitted through the second polarizer 106 can be converted into circularly polarized light (right-handed circularly polarized light or left-handed circularly polarized light) by the second quarter wave plate 105, and the circularly polarized light can pass through the lens assembly 200 and the beam splitter 104, and then reach the first quarter wave plate 103. The circularly polarized light reaching the first quarter wave plate 103 can be converted back to linearly polarized light (e.g., vertically polarized light (or p-polarized light)) when passing through the first quarter wave plate 103 and reaching the reflective polarizer 102.

[0070] The light may move in the second direction (display D->user's eyes) until it reaches the reflective polarizer 102. The light reaching the reflective polarizer 102 may be reflected by the reflective polarizer 102 in the first direction (user's eyes->display D). The light may be converted into circularly polarized light (right-handed circularly polarized light or left-handed circularly polarized light) while passing through the first quarter wave plate 103. The circularly polarized light (right-handed circularly polarized light or left-handed circularly polarized light) may be reflected by the beam splitter 104 in the second direction, and at this time, the phase may be shifted (for example, from left-handed circularly polarized light to right-handed circularly polarized light, or from right-handed circularly polarized light to left-handed circularly polarized light). The phase-shifted circularly polarized light may pass through the first quarter wave plate 103 and the reflective polarizer 102 along the second direction and reach the user's eyes. In this case, the light passing through the first quarter wave plate 103 may be converted into horizontally polarized light (or s-polarized light) and reach the user's eyes. However, it should be noted that Figure 3The embodiments are examples of state changes of light passing through the wearable electronic device 100 according to the embodiments, and the categories of the present disclosure are not necessarily limited to the embodiments.

[0071] Figure 4 is a view showing a lens assembly 200 according to an embodiment. Figure 5 is a view showing a lens assembly 200 according to an embodiment. Figure 4 The lens assembly 200 may be shown with a diopter of 0, and Figure 5 The lens assembly 200 may be shown as having a diopter of -6. The lens assembly 200 may include, from the user's eye side, a first lens L1 having positive refractive power, a second lens L2 having positive refractive power, a third lens L3 having negative refractive power, and a fourth lens L4 having positive refractive power.

[0072] At least one of the multiple lenses L1, L2, L3 and L4 included in the lens assembly 200 may include a lens formed of a synthetic resin (e.g., plastic) material. According to an embodiment, the multiple lenses may be formed of a synthetic resin so as to have a high degree of design freedom in size or shape. According to an embodiment, all lenses L1, L2, L3 and L4 included in the lens assembly may be formed of a synthetic resin material. In this way, since the multiple lenses included in the lens assembly 100 are formed of a synthetic resin material, the wearable electronic device 100 on which the lens assembly 100 is mounted can be advantageously made light and small.

[0073] The lens assembly 200 can be arranged on an optical axis OI that passes through the center of a plurality of lenses from an object O (object side) on a display D to an eye side I (image side) of a user. In the following description of the configuration of each lens, for example, the eye side of a user may indicate the direction in which the user's eye is positioned. Since an image is formed on the user's eye and the user recognizes an object, the user's eye may sense the image. In addition, the "surface facing the eye side I of the user" may be a surface on the eye side of the user relative to, for example, the optical axis OI (e.g., an image sensor), and in the drawings of the present disclosure, means the right surface (or front surface) of the lens. The "surface facing the display (D) side O" may represent the left surface (or rear surface) of the lens relative to the optical axis OI in the drawings.

[0074] The portion of each lens close to the optical axis OI may be referred to as a main portion. The portion away from the optical axis OI (or around the edge of the lens) may be referred to as an edge portion. The main portion may be, for example, a portion of a lens (e.g., the first lens L1) that intersects the optical axis OI. The edge portion may be, for example, a portion of a lens (e.g., the first lens L1) that is spaced a predetermined distance or more from the optical axis. The edge portion may include an end portion of the lens that is positioned farthest from the optical axis OI of the lens. In addition, according to an embodiment of the present disclosure, light passing through the main portion or a portion close to the main portion may be referred to as a short-axis beam, and light passing through the edge portion may be referred to as a long-axis beam.

[0075] Unless otherwise specified, the radius of curvature, thickness, total length from the image plane (TTL), and focal length of the lens as described herein may be in millimeters. The thickness of the lens, the spacing between lenses, or the TTL may be the distance measured from the center of the optical axis of the lens. When describing the shape of the lens, "one surface of the lens is convex" may mean that the optical axis portion of the surface is convex, and "one surface of the lens is concave" may mean that the optical axis portion of the surface is concave. Therefore, although one surface of the lens (e.g., the optical axis portion of the surface) is described as convex, the edge portion of the lens (e.g., the portion at a predetermined distance from the optical axis portion of the surface) may be concave. Similarly, although one surface of the lens (e.g., the optical axis portion of the surface) is described as concave, the edge portion of the lens (e.g., the portion at a predetermined distance from the optical axis portion of the surface) may be convex. As used herein, the term "inflection point" may mean a point where the radius of curvature changes in a portion that does not intersect the optical axis.

[0076] The lens assembly 200 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. When the user wears the wearable electronic device 100, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 may be arranged in order from the side close to the eye to the display D.

[0077] The first lens L1 included in the lens assembly 200 may have a positive refractive power. If light parallel to the optical axis is incident on the lens with a positive refractive power, the light may be focused after passing through the lens. For example, the lens with a positive refractive power may be a lens based on a convex lens principle. On the contrary, if parallel light is incident on the lens with a negative refractive power, the light may be dispersed after passing through the lens. For example, the lens with a negative refractive power may be a lens based on a concave lens principle. According to an embodiment, in the case of a lens assembly including four lenses, the first lens L1, the second lens L2, and the fourth lens L4 may have a positive refractive power, and the third lens L3 may have a negative refractive power.

[0078] The first lens L1 included in the lens assembly 200 may include a surface S2 facing the eye side I of the user on the screen of the display D and a surface S3 facing the object side O. The second lens L2 included in the lens assembly 200 may include a surface S4 facing the eye side I of the user on the screen of the display D and a surface S5 facing the object side O. The third lens L3 included in the lens assembly 200 may include a surface S6 facing the eye side I of the user on the screen of the display D and a surface S7 facing the object side O. The fourth lens L4 included in the lens assembly 200 may include a surface S8 facing the eye side I of the user on the screen of the display D and a surface S9 facing the object side O.

[0079] Although not shown separately in the drawings, the lens assembly 200 may further include a filter between the last lens (e.g., the fourth lens L4) from the user's eye side and the display D. For example, the filter may transmit visible light and block infrared light. For example, the filter may include at least one of a low-pass filter or a cover glass. For example, when the filter is installed, the color perceived by the user when seeing an object displayed on the display may be closer to the color perceived by the user when seeing the actual object. According to an embodiment, the filter between the fourth lens L4 and the display D may be implemented as described above in Figure 3 The second film portion F2 described in the embodiments.

[0080] The first lens L1 included in the lens assembly 200 may have at least one surface configured as a flat surface. For example, the first lens L1 may be a plano-concave lens having a positive refractive power. The first film portion F1 may be attached to the flat surface of the first lens L1. For example, the first film portion may include a first quarter wave plate 103 and a reflective polarizer 102. According to an embodiment, the first quarter wave plate 103 and the reflective polarizer 102 may be laminated and attached to the flat surface. According to an embodiment, the surface S2 of the first lens L1 facing the user's eye side I may be configured as a flat surface, and a laminated configuration of the first quarter wave plate 103 and the reflective polarizer 102 may be attached thereto (for example, Figure 8 and Fig. 9 ), or a surface S3 facing the object O on the screen of the display D of the first lens L1 may be configured as a flat surface. And a laminated configuration of a first quarter wave plate and a reflective polarizer may be attached thereto (for example, Figure 4 and Figure 5 of the embodiment of the invention).

[0081] The second lens L2 may include at least one convex surface. According to an embodiment, the second lens L2 may be a biconvex lens in which the surface S4 facing the user's eyes and the surface S5 facing the object on the screen of the display D are both convex. In addition, the beam splitter 104 may be formed on the convex surface of the second lens L2, so that the light passing through the first lens L1 and incident on the second lens L2 is reflected again and output toward the first lens L1. For example, the second lens L2 is a biconvex lens with positive refractive power, and can reflect or transmit light by applying a reflective mirror coating for separating the light to the surface S5 facing the display D. In this way, in the wearable electronic device 100 of the present disclosure, a laminated configuration of a first quarter wave plate and a reflective polarizer is attached to at least one surface of the first lens L1, and a reflective mirror coating is applied to the second lens L2, reducing the overall size of the optical system while extending the length of the optical path of the incident light.

[0082] The wearable electronic device 100 of the present disclosure is configured so that the first lens L1 and the second lens L2 are movable relative to the third lens L3 and the fourth lens L4. The third lens L3 and the fourth lens L4 can be fixed in the wearable electronic device 100. The movement of the first lens L1 and the second lens L2 causes vision correction by adjusting the diopter. The wearable electronic device 100 of the present disclosure can apply the vision correction function by moving the first lens L1 and the second lens L2 without degrading the performance. The third lens L3 and the fourth lens L4 can be configured as a negative lens and a positive lens, respectively. By configuring the third lens L3 and the fourth lens L4 with a material having an Abbe number difference of 30 or more, axial chromatic aberration and magnified edge chromatic aberration can be effectively corrected.

[0083] The wearable electronic device 100 including the lens assembly 200 described above may be configured with an optical system satisfying Formula 1 and Formula 2.

[0084] [Formula 1]

[0085] M12≥0.99

[0086] [Formula 2]

[0087] TTL / ImgH≤1.75

[0088] Here, M12 may be the combined group magnification of the first lens (first lens L1) and the second lens (second lens L2) on the user's eye side. TTL may be the distance from the eye side surface S2 of the first lens (first lens L1) on the user's eye side to the display D, and ImgH may be the maximum image height of the display D. The optical system of the present disclosure may assume that the screen output from the display is recognized by the cornea of ​​the user's eye. Therefore, the "maximum image height" is related to the size of the display D on which an object can be displayed, and may represent half of the diagonal length of the display D. Formula 1 is an equation representing the combined group magnification of the first lens (first lens L1) and the second lens (second lens L2) on the user's eye side adjusted according to diopter. If the combined group magnification is less than the lower limit, the movement of the lens adjusted according to diopter increases, resulting in significant performance changes, with the result that it is difficult to adjust the diopter. Formula 2 is an equation for the ratio of the total length (TTL) of the entire optical system to the maximum image height ratio used in the display D. When the value is greater than the upper limit of Formula 2, it may be difficult to minimize the size of the optical system.

[0089] In addition, in the wearable electronic device 100 of the present disclosure, the field of view of the entire optical system may satisfy the following Formula 3.

[0090] [Formula 3]

[0091] 80° ≤Fov≤100° (3)

[0092] Here, the field of view (Fov) may be the field of view of the entire optical system.

[0093] In the wearable electronic device 100 of the present disclosure, all lenses included in the lens assembly can be configured as plastic aspheric lenses. For example, by configuring all four lenses as plastic aspheric lenses, it is possible to ensure performance in an ultra-compact size and advantageously reduce manufacturing costs compared to glass lenses.

[0094] The wearable electronic device 100 of the present disclosure is an optical system in which the lens configuration of the entire optical system is configured to have positive power, positive power, negative power, and positive power from the eye. With this configuration, the design of an ultra-compact optical system with a wide angle greater than 90 degrees can be ensured.

[0095] In the wearable electronic device 100 of the present disclosure, the difference in Abbe number between the third lens (third lens L3) and the fourth lens (fourth lens L4) from the eye side may satisfy Formula 4 below.

[0096] [Formula 4]

[0097] 25≤V 4 -V 3 ≤40

[0098] Here, V 3 V4 may be the Abbe number of the third lens (third lens L3) from the user's eye side, and V5 may be the Abbe number of the fourth lens L4 from the user's eye side. If the upper limit of Formula 4 is exceeded, the difference in Abbe numbers between the positive lens and the negative lens is large, which is beneficial for correcting chromatic aberration. However, the material cost increases, resulting in an increase in product cost. Below the lower limit of Formula 4, the small difference in Abbe number makes it difficult to achieve effective chromatic aberration correction.

[0099] According to an embodiment, in the wearable electronic device 100, the angle of the main light incident from the display to the lens assembly may satisfy the following formula.

[0100] [Formula 5]

[0101] D CRA ≤35°

[0102] Here, D CRA π may represent the angle of the main ray incident on the lens from the display D. Here, the main ray may refer to a ray (e.g., a luminous flux) in the middle of a ray bundle emitted from an end line of the display D. Above the upper limit of the conditional equation 5, when the lens is moved according to the diopter adjustment, the performance changes significantly, making it impossible to adjust the diopter.

[0103] Table 1 below shows Figure 4 and Figure 5 Various lens data of the lens assembly 200 shown in , for example, information about lenses located on a light travel path in the lens assembly 200 including four lenses. "Eye" may mean a subject (e.g., an eye of a user). The radius may represent a radius of curvature of a lens, the thickness may represent a thickness of a lens or an air gap, nd may represent a refractive index of a medium (e.g., a lens), and vd may represent an Abbe number of a lens. Regarding thickness, a thickness marked on a surface (e.g., S2) of a certain lens (e.g., the first lens L1) on the eye side I facing the user may represent the thickness of the lens, and a thickness marked on a surface (e.g., S3) of a certain lens (e.g., the first lens L1) on the display side O facing the user may be described as an air gap from the lens to a lens (e.g., the second lens L2) located behind it along the optical axis direction. In FIGS. 2 and Figure 3 In the embodiments of the present invention, "S2 to S9" may refer to the user's eye-side (I) or display-side (O) surface of multiple related lenses (e.g., L1, L2, L3, and L4). For example, "S1" may be a position considered in the design of the lens assembly 200, rather than an actual lens surface. In Table 1 below, the "1" marked on the surface may indicate the position of the aperture. In the present disclosure, the position of the aperture in Table 1 may correspond to the pupil within the user's cornea.

[0104] In Table 1, "2 to 16" marked on the surface may indicate the surface of a lens, a quarter wave plate, a reflective polarizer, and / or a beam splitter positioned on a path along which light travels when the light passes through a plurality of lenses (e.g., L1, L2, L3, and L4). Information on the path along which light passes through the quarter wave plate, the reflective polarizer, and / or the beam splitter and information on the quarter wave plate, the reflective polarizer, and / or the beam splitter may be known through Table 1.

[0105] For example, a '2' on the surface may indicate a user-eye-side (I) surface S2 of the first lens L1. A '3' on the surface may indicate a display-side (O) surface S3 of the first lens L1 or a reflective polarizer. A '4' on the surface may indicate a first quarter-wave plate. A '5' on the surface may indicate a user-eye-side surface S4 of the second lens L2. A '6' on the surface may indicate a display-side (O) surface S5 of both the second lens L2 and the beam splitter. Light passing through the lens assembly 200 of the present disclosure may be reflected and travel by the reflective polarizer and / or the beam splitter. For example, light may be reflected from the display-side (O) surface S5 of the second lens L2 to which the beam splitter is applied, and then pass through the surface S4 of the second lens L2 facing the user's eye-side I, and reach the display-side (O) surface S3 of the first lens L1. Light re-reflected by the display-side (O) surface S3 of the first lens L1 laminated and attached with the first quarter-wave plate and the reflective polarizer may pass through the surface S4 of the second lens L2 facing the user's eye side I and the display-side (O) surface S5 of the second lens L2. Information about the refraction and / or reflection of the light path may be provided by data defined by 6, 7, and 8 on the surface in Table 1 below. As described above, "6" on the surface indicates the display-side (O) surface S5 of the second lens L2, and may include information when the light is reflected by the beam splitter. In Table 1, a negative (-) thickness may mean that light directed in one direction (the first direction or the second direction) is reflected by the portion (e.g., the display-side (O) surface S5 of the second lens L2) and travels in the opposite direction. "7" on the surface may indicate the user's eye-side (I) surface S4 of the second lens L2, and may include information about the light when the light is reflected by the display-side (O) surface S5 of the second lens L2 and reaches the user's eye-side (I) surface S4. Light that passes through the user's eye-side (I) surface S4 of the second lens L2 and reaches the display-side (O) surface S3 of the first lens L1 may be reflected from the reflective polarizer and propagate toward the second lens L2. In Table 1, "8" on the surface may indicate the reflective polarizer, and "9" on the surface may indicate the user's eye-side (I) surface S4 of the second lens L2. '10' on the surface may indicate the display-side (O) surface S5 of the second lens L2. The thickness D1 of "10" on the surface may indicate the distance between the second lens L2 and the third lens L3 when the diopter is 0 and -6, as provided by Table 2 of Table 1 below. "11" on the surface may indicate the user's eye-side (I) surface S6 of the third lens L3. "12" on the surface may indicate the display-side (O) surface S7 of the third lens L3. "13" on the surface may indicate the user's eye-side (I) surface S8 of the fourth lens L4. "14" on the surface may indicate the display-side (O) surface S9 of the fourth lens L4. The "15" on the surface may indicate the user-eye-side (I) surface of the filter."16" on the surface may indicate the display side (O) surface of the filter. Here, the filter may be configured to include a second film portion of a second quarter wave plate and a second polarizer as described above. "img" on the surface may indicate an image of an object output on the surface of the display D. Meanwhile, in Table 1 below, a surface marked with "*" and "2 to 16" marked on the surface may mean that the surface of the lens corresponding thereto is formed as an aspherical surface.

[0106] The lens assembly 200 included in the following Table 1 may relate to a telephoto lens having a field of view (ANG) of 90 degrees or less (a half field of view (HFOV) of 45 degrees or less). In addition, when the overall effective focal length (EFL) is 12.6 mm, the F number (Fno) is about 3.15, and the optical total length (OTTL) from the image plane is about 14.91 mm to about 15.95 mm, the lens assembly 200 included in Table 1 may satisfy the above conditions (and / or at least one of the above conditions).

[0107] [Table 1]

[0108]

[0109]

[0110] [Table 2]

[0111] 0D -6D D1 1.34 0.3

[0112] Refer to Table 1 and Table 2 above to describe again Figure 4 and Figure 5 It can be recognized that at 0 diopter, the distance between the second lens L2 and the third lens L3 is 1.34 mm, and at -6 diopter, the distance between the second lens L2 and the third lens L3 is 0.3 mm. The following Table 3 shows the aspheric coefficients of multiple lenses (e.g., L1, L2, L3, and L4), which can be calculated by the following Formula 6:

[0113] [Formula 6]

[0114]

[0115] Here, 'z' may represent a distance sag from the vertex of the lens to the optical axis OI, 'c' may represent the inverse of the radius of curvature at the vertex of the lens, 'y' may represent a distance in a direction perpendicular to the optical axis, 'K' may represent a cone constant, and 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', and 'I' may represent aspheric coefficients. In the numerical values ​​of Table 3 below, "E and the following numbers" may represent powers of 10. For example, E+01 may be 10 1, and E-02 can be 10 -2 . In Table 3, "2" on the surface may indicate a user's eye side (I) surface S2 of the first lens L1. "5, 7, and 9" on the surface are aspherical surfaces for the same surface of substantially the same lenses, and may indicate a user's eye side surface S4 of the second lens L2. "6 and 10" on the surface are also aspherical surfaces for the same surface of substantially the same lenses, and may indicate a display side surface S5 of the second lens L2. "11" on the surface may indicate a user's eye side surface S6 of the third lens L3. "12" on the surface may indicate a display side surface S7 of the third lens L3. "13" on the surface may indicate a user's eye side surface S8 of the fourth lens L4. "14" on the surface may indicate a display side surface S9 of the fourth lens L4. Referring to Table 3, in the lens assembly 200, the user's eye side surface S2 of the first lens L1, the user's eye side surface S4 and the display side surface S5 of the second lens L2, the user's eye side surface S6 and the display side surface S7 of the third lens L3, and the user's eye side surface S8 and the display side surface S9 of the fourth lens L4 can be formed as aspherical surfaces.

[0116] [Table 3]

[0117]

[0118] Fig. 6A is a graph showing spherical aberration of a lens assembly according to an embodiment. Figure 6B is a graph showing astigmatism of a lens assembly according to an embodiment. Figure 6C is a graph showing distortion of a lens assembly according to an embodiment. FIG. 6A to FIG. 6C The aberrations of the lens assembly when the diopter is 0 can be shown (e.g., Figure 4 of the embodiment of the invention). Fig. 7A is a graph showing spherical aberration of a lens assembly according to an embodiment. Figure 7B is a graph showing astigmatism of a lens assembly according to an embodiment. Figure 7C is a graph showing astigmatism of a lens assembly according to an embodiment. Figures 7A to 7C The aberrations of the lens assembly when the diopter is -6 can be shown (e.g., Figure 5 of the embodiment of the invention).

[0119] Fig. 6A and 7A is a graph showing spherical aberration of the lens assembly 200 according to an embodiment of the present disclosure. Spherical aberration may refer to a phenomenon in which light beams passing through different parts (eg, a main part and an edge part) of a lens are focused on different positions.

[0120] exist Fig. 6A and7A , the horizontal axis refers to the degree of longitudinal spherical aberration, and the vertical axis refers to the normalized result of the distance from the center of the optical axis. FIG. 2 may illustrate a change in longitudinal spherical aberration depending on the wavelength of light. The longitudinal spherical aberration may be illustrated for each light beam having a wavelength of about 656.2725 nanometers (nm), about 587.5618 nm, or about 486.1327 nm. Fig. 6A and Fig. 7A , within the visible light range, according to an embodiment of the present disclosure, the longitudinal spherical aberration of the lens assembly can be limited to a range of approximately +0.050 to -0.050, so that stable optical characteristics are shown except for light with a wavelength of 481.1327 nm.

[0121] Figure 6B and Figure 7B is a graph showing the astigmatism of the lens assembly 200 according to an embodiment of the present disclosure. Astigmatism may refer to the deviation between the focus of light beams passing in the vertical and horizontal directions when the tangential plane or the meridional plane of the lens has a radius different from the radius of the sagittal plane of the lens. Here, the tangential plane may be a surface including a curve on the lens positioned in a direction substantially perpendicular to the optical axis starting from the vertex of the lens, and the sagittal plane may be a surface including a curve on the lens positioned in a second direction substantially perpendicular to the optical axis starting from the vertex of the lens. Figure 6B and 7B In FIG. 1 , the vertical axis IMG HT may represent an image height. Here, the image height may mean a maximum distance from the optical axis OI to an edge of the display D (half the diagonal length of the display screen of the display D).

[0122] exist Figure 6B and 7B , the astigmatism of the lens assembly 200 is obtained at a wavelength of about 587.5618 nm, where the dashed line Y may represent the astigmatism in the tangential plane direction (e.g., tangential field curvature), and the solid line X may represent the astigmatism in the sagittal plane direction (e.g., sagittal field curvature). Figure 6B and Figure 7B It can be seen that the astigmatism can be limited to a range of about +0.050 to -0.050, so that the embodiments according to the present disclosure can show stable optical characteristics.

[0123] Figure 6C and 7C 2 is a graph showing distortion of the lens assembly 200 according to an embodiment of the present disclosure. Distortion occurs because the optical magnification varies according to the distance from the optical axis OI. Compared with the image formed on the theoretical imaging plane, the image formed on the actual imaging plane may be displayed as larger or smaller through distortion.

[0124] Figure 6C and 7C The distortion result of the lens assembly 200 is shown, which is obtained at a wavelength of about 587.5618 nm. The image captured by the lens assembly 200 may cause distortion at a point (e.g., an edge portion) away from the optical axis OI. However, the distortion is a degree that may generally occur in an optical device using a lens, and the lens assembly 200 according to one of the various embodiments of the present disclosure has a distortion rate of less than about ±25% and can provide good optical characteristics.

[0125] The description of the lens assembly 200 according to the aforementioned embodiment may be applied to the lens assemblies 200 and 300 described below according to another embodiment. Some of the plurality of lens assemblies 200 and 300 may have the same lens properties (e.g., field of view, focal length, autofocus, f-number, or optical zoom), or at least one lens assembly may have one or more lens properties that are different from the lens properties of another lens assembly.

[0126] When describing the following embodiments of the present disclosure, components that can be easily understood from the above embodiments are given the same or similar reference numerals, or are not given reference numerals. A detailed description thereof is not given below as long as it overlaps with the above description.

[0127] Figure 8 is a view showing a lens assembly according to an embodiment. Fig. 9 is a view showing a lens assembly according to an embodiment. Figure 8 The lens assembly 300 may be shown with a diopter of 0, and Fig. 9 The lens assembly 300 may be shown at a diopter of -6.

[0128] Reference Figure 8 and Fig. 9 According to an embodiment of the present disclosure, the lens assembly 300 may include a plurality of lenses (eg, L1, L2, L3, and L4). Figure 4 and Figure 5 The embodiments are different, according to Figure 8 and Fig. 9 The lens assembly 300 of an embodiment of the present invention may be shaped such that a user eye side (I) surface S2 of the first lens L1 is flat, and a surface S3 facing an object O on a screen on the display D of the first lens L1 is convex. In addition, according to an embodiment, the second lens L2 may be shaped such that a surface S5 facing an object O on a screen on the display D is convex, and a user eye side (I) surface is concave.

[0129] The following Tables 4 and 5 can show the Figure 8 and Fig. 9Various lens data of the lens assembly 300 of the embodiment of the present invention. The following Table 6 may show data for defining aspheric coefficients of a plurality of lenses (eg, L1, L2, L3, and L4).

[0130] In Table 4, "2 to 18" marked on the surface may indicate the surface of a lens, a quarter wave plate, a reflective polarizer, and / or a beam splitter positioned on a path along which light travels when the light passes through a plurality of lenses (e.g., L1, L2, L3, and L4). Information on the path along which light passes through the quarter wave plate, the reflective polarizer, and / or the beam splitter and information on the quarter wave plate, the reflective polarizer, and / or the beam splitter may be known through Table 4.

[0131] For example, a '2' on the surface may indicate a reflective polarizer. A '3' on the surface may indicate a first quarter wave plate of the first lens L1 and a user's eye-side surface S2. A '4' on the surface may indicate a display-side (O) surface S3 of the first lens L1. A '5' on the surface may indicate a user's eye-side surface S4 of the second lens L2. A '6' on the surface may indicate a display-side (O) surface S5 of both the second lens L2 and the beam splitter. Light passing through the lens assembly 300 of the present disclosure may be reflected and travel by a reflective polarizer and / or a beam splitter. For example, light may be reflected from a display-side (O) surface S5 of a second lens L2 formed with a beam splitter, and then pass through a surface S4 of the second lens L2 facing the user's eye side I and a display-side (O) surface S3 of the first lens L1, and reach a user's eye-side (I) surface S2 of the first lens L1. Light re-reflected by the user's eye-side (I) surface S2 of the first lens L1 laminated and attached with the first quarter-wave plate and the reflective polarizer may pass through the display-side (O) surface S3 of the first lens L1, the surface S4 of the second lens L2 facing the user's eye-side I, and the display-side (O) surface S5 of the second lens L2. Information on the refraction and / or reflection of the light path may be provided by data defined by 6, 7, and 8 on the surface in Table 4 below. In other words, "6" on the surface may indicate the display-side (O) surface S5 of the second lens L2, and may also indicate information on the light reflected from the beam splitter and passing through the second lens L2. "7" on the surface may indicate the user's eye-side surface S4 of the second lens L2, and indicate information on the light reflected from the beam splitter, passing through the second lens L2, and then reaching the display-side (O) surface S3 of the first lens L1. "8" on the surface may indicate the display-side (O) surface S3 of the first lens L1, and indicate information on the light until the light reaches the user-side (O) surface S2 of the first lens L1. "9" on the surface may indicate a reflective polarizer, and it may be recognized here that the light is reflected again. '10' on the surface may indicate a display side (O) surface S3 of the first lens L1, '11' on the surface may indicate a user side surface S4 of the second lens L2, and '12' on the surface may indicate a display side surface S5 of the second lens L2. In addition, '13' on the surface may indicate a user's eye side (I) surface S6 of the third lens L3. '14' on the surface may indicate a display side (O) surface S7 of the third lens L3. '15' on the surface may indicate a user eye side (O) surface S8 of the fourth lens L4. '16' on the surface may indicate a display side (O) surface S9 of the fourth lens L4. '17' on the surface may indicate a user eye side (I) surface of the filter. '18' on the surface may indicate a display side (O) surface of the filter. Here, the filter may be configured to include a second film portion of a second quarter wave plate and a second polarizer as described above."img" on the surface may indicate an image of an object output on the surface of the display D. Meanwhile, in Table 4 below, a surface marked with "*" and "2 to 18" marked on the surface may indicate that the surface of the lens opposite thereto is formed as an aspherical surface.

[0132] The lens assembly 200 included in the following Table 4 may relate to a telephoto lens having a field of view (ANG) of 90 degrees or less (a half field of view (HFOV) of 45 degrees or less). In addition, when the overall effective focal length (EFL) is 12.8 mm, the F number (Fno) is about 3.2, and the optical total length (OTTL) from the image plane is about 13.95 mm to about 15 mm, the lens assembly 200 included in Table 4 may satisfy the above conditions (and / or at least one of the above conditions).

[0133] [Table 4]

[0134] surface radius thickness EFL nd vd 1(Aperture) unlimited 10 2 unlimited 0.3 1.5168 64.17 3 unlimited 2 49.1563 1.5348 55.71 4* -26.289 0.3 5* -30.269 2.713 -154.6325 1.54401 55.91 6* -48.775 -2.713 -41.3446 -1.54401 55.91 7* -30.269 -0.3 8* -26.289 -2 10.3711 -1.5348 55.71 9 unlimited 2 49.1563 1.5348 55.71 10* -26.289 0.3 11* -30.269 2.713 -154.6325 1.54401 55.91 12* -48.775 D1 13* 302.505 3.5 72.6894 1.63492 23.89 14* -54.217 0.3 15* -46.298 2.421 312.3564 1.5348 55.71 16* -36.912 0.845 17 unlimited 0.25 1.5168 64.17 18 unlimited 0.7 1.5168 64.2 img unlimited 0

[0135] [Table 5]

[0136] 0D -6D D1 1.38 0.3

[0137] Refer to Table 4 and Table 5 above to describe again Figure 8 and Fig. 9 Embodiment. It can be recognized that at 0 diopter, the distance between the second lens L2 and the third lens L3 is 1.38 mm, and at -6 diopter, the distance between the second lens L2 and the third lens L3 is 0.3 mm. In Table 6 below, "4, 8, and 10" on the surface are aspherical surfaces for the same surface of substantially the same lens, and may indicate a display-side surface S3 of the first lens L1. "5, 7, and 11" on the surface may indicate a user-side surface S4 of the second lens L2. "6 and 12" on the surface may indicate a display-side surface S5 of the second lens L2. "13" on the surface may indicate a user's eye-side surface S6 of the third lens L3. "14" on the surface may indicate a display-side surface S7 of the third lens L3. "15" on the surface may indicate a user's eye-side surface S8 of the fourth lens L4. "16" on the surface may indicate a display-side surface S9 of the fourth lens L4. Referring to Table 6, in the lens assembly 200 according to the embodiment, the display side surface S3 of the first lens L1, the user's eye side surface S4 and the display side surface S5 of the second lens L2, the user's eye side surface S6 and the display side surface S7 of the third lens L3, and the user's eye side surface S8 and the display side surface S9 of the fourth lens L4 can be formed as aspherical surfaces.

[0138] [Table 6]

[0139] surface K A B C D E F 4 0 9.34E-05 3.28E-08 -2.26E-11 -1.04E-12 -1.83E-14 5.16E-17 5 0 1.29E-04 -2.29E-07 -5.30E-10 -7.06E-14 1.20E-14 -2.55E-17 6 0 1.61E-05 -6.35E-08 -4.35E-11 5.77E-13 -3.49E-15 1.36E-17 7 0 1.29E-04 -2.29E-07 -5.30E-10 -7.06E-14 1.20E-14 -2.55E-17 8 0 9.34E-05 3.28E-08 -2.26E-11 -1.04E-12 -1.83E-14 5.16E-17 10 0 9.34E-05 3.28E-08 -2.26E-11 -1.04E-12 -1.83E-14 5.16E-17 11 0 1.29E-04 -2.29E-07 -5.30E-10 -7.06E-14 1.20E-14 -2.55E-17 12 0 1.61E-05 -6.35E-08 -4.35E-11 5.77E-13 -3.49E-15 1.36E-17 13 0 -2.67E-06 4.49E-07 2.93E-09 -1.72E-11 2.66E-14 -1.27E-16 14 0 8.31E-05 3.72E-07 -4.84E-09 6.53E-13 9.49E-14 -2.95E-16 15 0 6.77E-05 8.19E-07 1.82E-09 -8.37E-11 2.85E-13 0.00E+00 16 0 -2.15E-04 1.04E-05 -1.61E-07 1.39E-09 -4.48E-12 0.00E+00

[0140] According to one embodiment, the lens assemblies 200 and 300 according to various embodiments of the present disclosure may have values ​​satisfying each formula as shown in Table 7 below.

[0141] [Table 7]

[0142]

[0143]

[0144] Fig. 10A is a graph showing spherical aberration of a lens assembly according to an embodiment. Fig. 10B is a graph showing astigmatism of a lens assembly according to an embodiment. Fig. 10C is a graph showing distortion of a lens assembly according to an embodiment. Fig.11A is a graph showing spherical aberration of a lens assembly according to an embodiment. Fig. 11B is a graph showing astigmatism of a lens assembly according to an embodiment. Fig. 11C is a graph showing astigmatism of a lens assembly according to an embodiment.

[0145] Fig. 10A and 11A is a graph showing spherical aberration of the lens assembly 300 according to an embodiment of the present disclosure. Spherical aberration may refer to a phenomenon in which light beams passing through different parts (eg, a main part and an edge part) of a lens are focused on different positions.

[0146] exist Fig. 10A and 11A , the horizontal axis refers to the degree of longitudinal spherical aberration, and the vertical axis refers to the normalized result of the distance from the center of the optical axis. FIG. 2 may illustrate a change in longitudinal spherical aberration depending on the wavelength of light. The longitudinal spherical aberration may be illustrated for each light beam having a wavelength of about 656.2725 nanometers (nm), about 587.5618 nm, or about 486.1327 nm. Fig. 10A and Fig.11A , in the visible light range, according to an embodiment of the present disclosure, the longitudinal spherical aberration of the lens assembly can be limited to a range of approximately +0.050 to -0.050, so that stable optical characteristics are shown except for light with a wavelength of 481.1327 nm.

[0147] Fig. 10B and 11Bis a graph showing the astigmatism of the lens assembly 300 according to an embodiment of the present disclosure. Astigmatism may refer to the deviation between the focus of light beams passing in the vertical and horizontal directions when the tangential plane or the meridional plane of the lens has a radius different from the radius of the sagittal plane of the lens. Here, the tangential plane may be a surface including a curve on the lens positioned in a direction substantially perpendicular to the optical axis starting from the vertex of the lens, and the sagittal plane may be a surface including a curve on the lens positioned in a second direction substantially perpendicular to the optical axis starting from the vertex of the lens. Fig. 10B and 11B In FIG. 1 , the vertical axis IMG HT may represent the image height. Here, the image height may mean the maximum distance from the optical axis OI to the edge of the display D (half the diagonal length of the display screen of the display D). Fig. 10B and 11B , the astigmatism of the lens assembly 300 is obtained at a wavelength of about 587.5618 nm, where the dashed line Y may represent the astigmatism in the tangential plane direction (e.g., tangential field curvature), and the solid line X may represent the astigmatism in the sagittal plane direction (e.g., sagittal field curvature). Fig. 10B It can be recognized that the astigmatism can be limited to a range of about +0.050 to -0.050, so that the embodiments according to the present disclosure can show stable optical characteristics. Fig. 11B It can be recognized that even in the state of -6 diopters, astigmatism can be limited to about +0.200 to -0.200.

[0148] Fig. 10C and Fig. 11C 3 is a graph showing distortion of the lens assembly 300 according to an embodiment of the present disclosure. Distortion occurs because the optical magnification varies according to the distance from the optical axis OI. Compared with the image formed on the theoretical imaging plane, the image formed on the actual imaging plane may be displayed as larger or smaller through distortion.

[0149] Fig. 10C and Fig. 11C The distortion result of the lens assembly 300 is shown, which is obtained at a wavelength of about 587.5618 nm. The image captured by the lens assembly 300 may cause distortion at a point (e.g., an edge portion) away from the optical axis OI. However, the distortion is a degree that may generally occur in an optical device using a lens, and the lens assembly 300 according to one of the various embodiments of the present disclosure has a distortion rate of less than about ±25% and can provide good optical characteristics.

[0150] In certain embodiments, a wearable electronic device may include an electronic device that can be fastened to a person's body. The electronic device may include various components as described below.

[0151] Fig.12 FIG. 1 is a diagram showing an electronic device 1201 (eg, Figure 1 Block diagram of an electronic device 100) (e.g., an optical device).

[0152] refer to Fig.12 , the electronic device 1201 (e.g., an optical device in the network environment 1200) may communicate with at least one of the electronic devices 1202 via a first network 1298 (e.g., a short-range wireless communication network), or communicate with at least one of the electronic device 1204 or the server 1208 via a second network 1299 (e.g., a long-range wireless communication network). According to an embodiment, the electronic device 1201 may communicate with the electronic device 1204 via the server 1208. According to an embodiment, the electronic device 1201 may include a processor 1220, a memory 1230, an input module 1250, a sound output module 1255, a display module 1260, an audio module 1270, a sensor module 1276, an interface 1277, a connection terminal 1278, a haptic module 1279, a camera module 1280, a power management module 1288, a battery 1289, a communication module 1290, a user identification module (SIM) 1296, or an antenna module 1297. In some embodiments, at least one of the components (e.g., the display device 1260 or the camera module 1280) may be omitted from the electronic device 1201, or one or more other components may be added to the electronic device 1201. Depending on the embodiment, some of the components (e.g., the sensor module 1276, the camera module 1280, or the antenna module 1297) may be integrated into a single component (e.g., the display module 1260).

[0153] The processor 1220 may execute, for example, software (e.g., program 1240) to control at least one other component (e.g., hardware or software component) of the electronic device 1201 coupled to the processor 1220, and may perform various data processing or calculations. According to an embodiment, as at least part of the data processing or calculation, the processor 1220 may store a command or data received from another component (e.g., sensor module 1276 or communication module 1290) in the volatile memory 1232, process the command or data stored in the volatile memory 1232, and store the obtained data in the non-volatile memory 1234. According to an embodiment, the processor 1220 may include a main processor 1221 (e.g., a central processing unit (CPU) or an application processor (AP)) or an auxiliary processor 1223 (e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)), and the auxiliary processor 1223 may operate independently of the main processor 121 or in conjunction with the main processor 121. For example, when the electronic device 1201 includes a main processor 1221 and an auxiliary processor 1223, the auxiliary processor 1223 may be configured to use lower power than the main processor 1221 or be designated for a designated function. The auxiliary processor 1223 may be implemented separately from the main processor 1221 or as part of the main processor 1221.

[0154] The auxiliary processor 1223 may replace the main processor 1221 when the main processor 1221 is in an inactive (e.g., sleep) state, or control at least some of the functions or states related to at least one of the components of the electronic device 1201 (e.g., display module 1260, sensor module 1276, or communication module 1290) together with the main processor 1221 when the main processor 1221 is in an active state (e.g., executing an application). According to an embodiment, the auxiliary processor 1223 (e.g., an image signal processor or a communication processor) may be implemented as a part of another component (e.g., a camera module 1280 or a communication module 1290) that is functionally related to the auxiliary processor 123. According to an embodiment, the auxiliary processor 1223 (e.g., a neural processing unit) may include a hardware structure designated for artificial intelligence model processing. The artificial intelligence model may be generated via machine learning. Such learning may be performed, for example, by the electronic device 1201 that performs artificial intelligence or via a separate server (e.g., server 1208). The learning algorithm may include, but is not limited to, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include multiple artificial neural network layers. The artificial neural network may be 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 thereof, but is not limited thereto. Additionally or alternatively, the artificial intelligence model may include a software structure in addition to a hardware structure.

[0155] The memory 1230 may store various data used by at least one component of the electronic device 1201 (e.g., the processor 1220 or the sensor module 1276). The various data may include, for example, software (e.g., program 1240) and input data or output data for commands related thereto. The memory 1230 may include a volatile memory 1232 or a non-volatile memory 1234.

[0156] The program 1240 may be stored as software in the memory 1230 , and may include, for example, an operating system (OS) 1242 , middleware 1244 , or an application 1246 .

[0157] The input module 1250 may receive commands or data to be used by other components (e.g., the processor 1220) of the electronic device 1201 from outside (e.g., a user) of the electronic device 1201. The input module 1250 may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus).

[0158] The sound output module 1255 can output sound signals to the outside of the electronic device 1201. The sound output module 1255 may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing records. The receiver may be used to receive incoming calls. Depending on the embodiment, the receiver may be implemented as a part of the speaker or as a part of the speaker.

[0159] The display module 1260 can visually provide information to the outside of the electronic device 1201 (e.g., a user). The display 1260 may include, for example, a display, a hologram device, or a projector, and a control circuit for controlling a corresponding one of the display, the hologram device, and the projector. According to an embodiment, the display 1260 may include a touch sensor configured to detect a touch or a pressure sensor configured to measure the strength of a force generated by a touch.

[0160] The audio module 1270 may convert sound into an electrical signal, and vice versa. According to an embodiment, the audio module 1270 may obtain sound via the input module 1250, or output sound via the sound output module 1255 or an earphone of an external electronic device (e.g., electronic device 1202) directly (e.g., wired) or wirelessly coupled to the electronic device 1201.

[0161] The sensor module 1276 may detect an operating state (e.g., power or temperature) of the electronic device 1201 or an environmental state (e.g., a state of a user) outside the electronic device 1201, and then generate an electrical signal or data value corresponding to the detected state. Depending on an embodiment, the sensor module 1276 may include, for example, a gesture sensor, a gyroscope sensor, an atmospheric pressure sensor, a magnetic sensor, an accelerometer, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illumination sensor.

[0162] The interface 1277 may support one or more designated protocols for the electronic device 1201 to be directly (e.g., wired) or wirelessly coupled to an external electronic device (e.g., the electronic device 1202). According to an embodiment, the interface 1277 may include, for example, a high-definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface.

[0163] The connection terminal 1278 may include a connector, via which the electronic device 1201 may be physically connected to an external electronic device (e.g., the electronic device 1202). Depending on the embodiment, the connection terminal 1278 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0164] The haptic module 1279 may convert the electric signal into mechanical stimulation (eg, vibration or motion) or electric stimulation that can be recognized by the user via his tactile or kinesthetic sense. According to an embodiment, the haptic module 1279 may include, for example, a motor, a piezoelectric element, or an electric stimulator.

[0165] The camera module 1280 may capture still images or moving images. According to an embodiment, the camera module 1280 may include one or more lenses, an image sensor, an image signal processor, or a flash.

[0166] The power management module 1288 may manage power supplied to the electronic device 1201. According to an embodiment, the power management module 1288 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

[0167] The battery 1289 may supply power to at least one component of the electronic device 1201. According to an embodiment, the battery 1289 may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0168] The communication module 1290 may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device 1201 and an external electronic device (e.g., electronic device 1202, electronic device 1204, or server 1208), and perform communication via the established communication channel. The communication module 1290 may include one or more communication processors that may operate independently of the processor 1220 (e.g., an application processor (AP)) and support direct (e.g., wired) communication or wireless communication. According to an embodiment, the communication module 1290 may include a wireless communication module 1292 (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 1294 (e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules can communicate with the external electronic device 1204 via a first network 1298 (e.g., a short-range communication network such as Bluetooth™, Wireless Fidelity (Wi-Fi) Direct, or Infrared Data Association (IrDA)) or a second network 1299 (e.g., a long-range communication network such as a traditional cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a local area network (LAN) or a wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as a plurality of components (e.g., a plurality of chips) separated from each other. The wireless communication module 1292 may identify or authenticate the electronic device 1201 in a communication network (such as the first network 1298 or the second network 1299) using subscriber information (e.g., an International Mobile Subscriber Identity (IMSI)) stored in the subscriber identification module 1296.

[0169] The wireless communication module 1292 can support 5G networks and next-generation communication technologies (e.g., new radio (NR) access technology) after the 4G network. NR access technology can support enhanced mobile broadband (eMBB), massive machine type communication (mMTC), or ultra-reliable and low-latency communication (URLLC). The wireless communication module 1292 can support high-frequency bands (e.g., mmWave bands) to achieve, for example, high data transmission rates. The wireless communication module 1292 can support various technologies for ensuring performance on high-frequency bands, such as beamforming, massive multiple-input multiple-output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, or massive antennas. The wireless communication module 1292 can support various requirements specified in the electronic device 1201, an external electronic device (e.g., electronic device 1204), or a network system (e.g., a second network 1299). In accordance with an embodiment, the wireless communication module 1292 may support a peak data rate for implementing eMBB (e.g., 20 Gbps or greater), loss coverage for implementing mMTC (e.g., 164 dB or less), or U-plane delay for implementing URLLC (e.g., 0.5 ms or less for each of the downlink (DL) and uplink (UL), or 1 ms or less round trip).

[0170] The antenna module 1297 may send a signal or power to the outside (e.g., an external electronic device) or receive a signal or power from the outside (e.g., an external electronic device). According to an embodiment, the antenna module 1297 may include an antenna including a radiator formed by a conductor or a conductive pattern formed on a substrate (e.g., a printed circuit board (PCB)). According to an embodiment, the antenna module 1297 may include a plurality of antennas (e.g., an antenna array). In this case, at least one antenna suitable for a communication scheme used in a communication network (such as the first network 1298 or the second network 1299) may be selected from a plurality of antennas by, for example, the communication module 1290. Then, a signal or power may be sent or received between the communication module 1290 and the external electronic device via the selected at least one antenna. According to an embodiment, other components (e.g., a radio frequency integrated circuit (RFIC)) in addition to the radiator may also be formed as part of the antenna module 1297.

[0171] According to various embodiments, the antenna module 1297 may form a millimeter wave antenna module. According to an embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent to a first surface (e.g., bottom surface) of the printed circuit board and capable of supporting a specified high frequency band (e.g., mmWave frequency band), and a plurality of antennas (e.g., array antennas) disposed on or adjacent to a second surface (e.g., top surface or side surface) of the printed circuit board and capable of transmitting or receiving signals of the specified high frequency band.

[0172] At least some of the above components may be coupled to each other and transmit signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), a serial peripheral interface (SPI), or a mobile industry processor interface (MIPI)).

[0173] According to an embodiment, commands or data may be sent or received between the electronic device 1201 and the external electronic device 1204 via a server 1208 coupled to the second network 1299. The external electronic devices 1202 and 1204 may each be a device of the same or different type as the electronic device 1201. According to an embodiment, all or some operations to be performed at the electronic device 1201 may be performed at one or more of the external electronic devices 1202, 1204, or 1208. For example, if the electronic device 1201 should automatically or in response to a request from a user or another device to perform a function or service, the electronic device 1201 may request one or more external electronic devices to perform at least a part of the function or service, instead of performing the function or service, or in addition to performing the function or service, the electronic device 1201 may also request one or more external electronic devices to perform at least a part of the function or service. The one or more external electronic devices receiving the request may perform at least a part of the requested function or service, or an additional function or additional service related to the request, and transmit the result of the execution to the electronic device 1201. The electronic device 1201 may provide the result with or without further processing the result as at least part of the reply to the request. To this end, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technologies may be used.

[0174] The electronic device 1201 may use, for example, distributed computing or mobile edge computing to provide ultra-low latency services. In another embodiment, the external electronic device 1204 may include an Internet of Things (IoT) device. The server 1208 may be an intelligent server using machine learning and / or neural networks. According to an embodiment, the external electronic device 1204 or the server 1208 may be included in the second network 1299. The electronic device 1201 may be applied to intelligent services (e.g., smart homes, smart cities, smart cars, or health care) based on 5G communication technology or IoT-related technologies.

[0175] Fig.13 is a block diagram 1300 illustrating a camera module 1380 according to various embodiments.

[0176] refer to Fig.13 The camera module 1380 may include a lens assembly 1310 (eg, 200 or 300), a flash 1320, an image sensor 1330 (eg, IS), an image stabilizer 1340, a memory 1350 (eg, a buffer memory (eg, Fig.12 1230)) or an image signal processor 1360. The lens assembly 1310 may collect light emitted or reflected from an object whose image is to be captured. The lens assembly 1310 may include one or more lenses. According to an embodiment, the camera module 1380 may include a plurality of lens assemblies 1310. In this case, the camera module 1380 may form, for example, a dual camera, a 360-degree camera, or a spherical camera. Some of the plurality of lens assemblies 1310 may have the same lens properties (e.g., viewing angle, focal length, autofocus, f-number (Fno) or optical zoom), or at least one lens assembly may have one or more lens properties that are different from the lens properties of another lens assembly. The lens assembly 1310 may include, for example, a wide-angle lens or a telephoto lens.

[0177] The flashlight 1320 may emit light for enhancing light reflected from an object. According to an embodiment, the flashlight 1320 may include one or more light emitting diodes (LEDs) (e.g., red-green-blue (RGB) LEDs, white LEDs, infrared (IR) LEDs, or ultraviolet (UV) LEDs) or xenon lamps. The image sensor 1330 may obtain an image corresponding to an object by converting light emitted or reflected from an object and transmitted via the lens assembly 1310 into an electrical signal. According to an embodiment, the image sensor 1330 may include one selected from image sensors with different properties, such as an RGB sensor, a black and white (BW) sensor, an IR sensor, or a UV sensor, a plurality of image sensors with the same properties, or a plurality of image sensors with different properties. Each image sensor included in the image sensor 1330 may be implemented using, for example, a charge coupled device (CCD) sensor or a complementary metal oxide semiconductor (CMOS) sensor.

[0178] The image stabilizer 1340 may move the image sensor 1330 or at least one lens included in the lens assembly 1310 in a specific direction, or control the operating properties of the image sensor 1330 (e.g., adjusting the readout timing) in response to the movement of the camera module 1380 or the electronic device 1201 including the camera module 180. This allows compensation for at least a portion of the negative effects (e.g., image blur) caused by the movement on the image being captured. According to an embodiment, the image stabilizer 1340 may sense such movement by the camera module 1380 or the electronic device 1201 using a gyroscope sensor (not shown) or an acceleration sensor (not shown) disposed inside or outside the camera module 1380. According to an embodiment, the image stabilizer 1340 may be implemented as, for example, an optical image stabilizer. The memory 1350 may at least temporarily store at least a portion of the image obtained via the image sensor 1330 for subsequent image processing tasks. For example, if image capture is delayed due to shutter lag or multiple images are captured quickly, the obtained original image (e.g., Bayer patterned image, high-resolution image) may be stored in the memory 1350, and its corresponding copy image (e.g., low-resolution image) may be previewed via the display device 1260. Thereafter, if a specified condition is met (e.g., by a user's input or a system command), at least a portion of the original image stored in the memory 1350 may be obtained and processed, for example, by the image signal processor 1360. According to an embodiment, the memory 1350 may be configured as Fig.12 at least a portion of the memory 1230, or configured as a separate memory that operates independently of the memory.

[0179] The image signal processor 1360 may perform one or more image processing on an image obtained via the image sensor 1330 or an image stored in the memory 1350. The one or more image processing may include, for example, depth map generation, three-dimensional (3D) modeling, panorama generation, feature point extraction, image synthesis, or image compensation (e.g., noise reduction, resolution adjustment, brightness adjustment, blurring, sharpening, or softening). Additionally or alternatively, the image signal processor 1360 may perform control (e.g., exposure time control or readout timing control) on at least one of the components included in the camera module 1380 (e.g., image sensor 1330). The image processed by the image signal processor 1360 may be stored back in the memory 1350 for further processing, or may be provided to an external component (e.g., memory 1230, display device 1260, electronic device 1202, electronic device 1204, or server 1208) outside the camera module 1380. According to an embodiment, the image signal processor 1360 may be configured as at least a part of the processor 1220, or may be configured as a separate processor that operates independently of the processor 1220. If the image signal processor 1360 is configured as a processor separate from the processor 1220 , at least one image processed by the image signal processor 1360 may be displayed by the processor 1360 via the display device 1360 as is or after further processing.

[0180] According to an embodiment, the electronic device 1201 may include a plurality of camera modules 1380 having different properties or functions. In this case, at least one of the plurality of camera modules 1380 may form, for example, a wide-angle camera, and at least another of the plurality of camera modules 180 may form a telephoto camera. Similarly, at least one of the plurality of camera modules 1380 may form, for example, a front camera, and at least another of the plurality of camera modules 180 may form a rear camera.

[0181] The electronic device according to various embodiments may be one of various types of devices. The electronic device may include, for example, a portable communication device (e.g., a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a household appliance. According to an embodiment of the present invention, the electronic device is not limited to the embodiments listed above.

[0182] It should be understood that the various embodiments of the present disclosure and the terms used therein are not intended to limit the technical features set forth herein to specific embodiments, and include various changes, equivalents or replacements of the corresponding embodiments. With respect to the description of the accompanying drawings, similar reference numerals may be used to refer to similar or related elements. It should be understood that, unless otherwise clearly stated in the relevant context, the singular form of the noun corresponding to the project may include one or more things. As used herein, each of the 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" may include all possible combinations of the items listed together in the corresponding phrase. As used herein, terms such as "first" and "second" or "first" and "second" may be used to simply distinguish the corresponding component from another component, and do not limit the component in other aspects (e.g., importance or order). It should be understood that if an element (e.g., a first element) is referred to as being "coupled with another element (e.g., a second element)", "coupled to another element", "connected to another element" or "connected to another element" with or without the term "operably" or "communicatively", it means that the element can be coupled to the other element directly (e.g., wired), wirelessly or via a third element.

[0183] As used herein, the term "module" may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with other terms (e.g., "logic," "logic block," "component," or "circuit"). A module may be a single integrated component or its smallest unit or portion suitable for performing one or more functions. For example, according to an embodiment, a module may be implemented in the form of an application specific integrated circuit (ASIC).

[0184] The various embodiments described herein may be implemented as software (e.g., program 1240) including one or more instructions stored in a storage medium (e.g., internal memory 1236 or external memory 1238) readable by a machine (e.g., electronic device 1201). For example, a processor (e.g., processor 1220) of a machine (e.g., electronic device 1201) may call at least one of the one or more instructions stored in the storage medium and execute it with or without one or more other components under the control of the processor. This allows the machine to be operated to perform at least one function according to 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. Among them, the term "non-transitory" simply means that the storage medium is a tangible device and does not include signals (e.g., electromagnetic waves), but the term does not distinguish between where data is semi-permanently stored in the storage medium and where data is temporarily stored in the storage medium.

[0185] According to an embodiment, the method according to various embodiments of the present disclosure may be included and provided in a computer program product. The computer program product may be traded between a seller and a buyer as a commodity. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disc read-only memory (CD-ROM)), or distributed online (e.g., downloaded or uploaded) via an application store (e.g., PlayStoreTM), or distributed (e.g., downloaded or uploaded) directly between two user devices (e.g., smart phones). If distributed online, at least a portion of the computer program product may be temporarily generated or at least temporarily stored in a machine-readable storage medium, such as a memory of a manufacturer's server, a server of an application store, or a relay server.

[0186] According to various embodiments, each of the above-mentioned components (e.g., a module or a program) may include a single entity or multiple entities. Some of the multiple entities may be individually arranged in different components. According to various embodiments, one or more of the above-mentioned components may be omitted, or one or more other components may be added. Alternatively or additionally, multiple components (e.g., a module or a program) may be integrated into a single component. In this case, according to various embodiments, the integrated component may still perform one or more functions of each of the multiple components in the same or similar manner as performed by the corresponding components in the multiple components before integration. According to various embodiments, the operations performed by a module, a program or another component may be performed sequentially, in parallel, repeatedly or heuristically, or one or more of the operations may be performed or omitted in a different order, or one or more other operations may be added.

[0187] According to an embodiment of the present disclosure, the wearable electronic device 100 may include a lens assembly 200 or 300, which includes at least four lenses arranged along an optical axis OI from the user's eye side to the display D. The first lens L1 closest to the user's eye side of the lens assembly may include at least one flat surface, and the first quarter wave plate (QWP) 103 and the first refractive member 102 are disposed on the at least one flat surface. The second lens L2 from the user's eye side may include at least one convex surface on which the second refractive member 104 is formed.

[0188] According to an embodiment, a wearable electronic device satisfying the following Formula 1 and Formula 2 may be provided.

[0189] [Formula 1]

[0190] M12≥0.99

[0191] [Formula 2]

[0192] TTL / ImgH≤1.75

[0193] (wherein M12 in Formula 1 is the combined group magnification of the first lens and the second lens on the user's eye side, TTL in Formula 2 is the distance between the eye side surface of the first lens on the user's eye side and the display, and ImgH in Formula 2 is the maximum image height of the display).

[0194] According to an embodiment, the first refractive member 102 may be a reflective polarizer, and the first refractive member is laminated with the first quarter wave plate 103 to form the first film portion F1.

[0195] According to an embodiment, the second refractive member 104 may be a beam splitter.

[0196] According to an embodiment, the wearable electronic device may further include a second quarter wave plate 105 and a polarizer 106 disposed between the lens assembly and the display.

[0197] According to an embodiment, the user's eye-side first lens L1 may have a convex user-eye-side surface S2 and a flat display-side surface S3.

[0198] According to an embodiment, the user's eye-side first lens L1 may have a flat user's eye-side surface S2 and a convex display-side surface S3.

[0199] According to an embodiment, a wearable electronic device satisfying the following Formula 3 may be provided.

[0200] [Formula 3]

[0201] 80°≤Fov≤100°

[0202] (Where Fov in conditional equation 3 is the field of view of the entire optical system).

[0203] According to an embodiment, lenses L1 , L2 , L3 , and L4 included in the lens assembly may be configured as plastic lenses.

[0204] According to an embodiment, at least one lens of the lenses L1 , L2 , L3 , and L4 included in the lens assembly may be configured as a lens including an aspherical surface.

[0205] According to an embodiment, the lenses included in the lens assembly may have positive refractive power, positive refractive power, negative refractive power, and positive refractive power in sequence from the user's eye side.

[0206] According to an embodiment, a wearable electronic device may be provided in which a difference in Abbe number between a third lens L3 and a fourth lens L4 from a user's eye side satisfies the following Formula 4.

[0207] [Formula 4]

[0208] 25≤V 4 -V 3 ≤40

[0209] (Where V in Formula 4 3 is the Abbe number of the third lens from the user's eye side, and V 4 is the Abbe number of the fourth lens from the user's eye side).

[0210] According to an embodiment, a wearable electronic device may be provided in which an angle of a principal ray incident from a display D to a lens satisfies the following Formula 5.

[0211] [Formula 5]

[0212] D CRA ≤35°

[0213] (where D in condition Equation 5 CRA is the angle of the chief ray incident on the lens from the display).

[0214] According to the embodiment, the user's eye side first lens L1 and the user's eye side second lens L2 are configured to move in the optical axis direction to achieve diopter adjustment.

[0215] According to an embodiment, augmented reality (AR), virtual reality (VR), mixed reality (MR), or extended reality (XR) may be applied to a wearable electronic device.

[0216] According to an embodiment, the wearable electronic device may be a visual see-through (VST) type.

[0217] According to an embodiment of the present disclosure, the wearable electronic device 100 may include a lens assembly 200 or 300, which includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged in sequence along the optical axis direction from the user's eye side to the display. The first lens L1 of the lens assembly 200 or 300 may include a user's eye side surface S2 configured as a flat surface or a display side surface S3 configured as a flat surface, and is formed by laminating a first quarter wave plate 103 and a reflective polarizer 102 on the flat surface. The second lens L2 may include at least one convex surface on which a beam splitter 104 is formed. The second quarter wave plate 105 and the polarizer 106 may be formed on the display side surface S9 of the fourth lens L4. The user's eye side first lens L1 and the user's eye side second lens L2 are configured to move in the optical axis direction to achieve diopter adjustment. In this case, the user's eye side third lens L3 and the user's eye side fourth lens L4 may be fixed in place.

[0218] According to an embodiment, a wearable electronic device satisfying the following Formula 1 and Formula 2 may be provided.

[0219] [Formula 1]

[0220] M12≥0.99

[0221] [Formula 2]

[0222] TTL / ImgH≤1.75

[0223] (where M12 in Formula 1 is the combined group magnification of the first lens and the second lens, TTL in Formula 2 is the distance between the eye-side surface of the first lens and the display, and ImgH in Formula 2 is the maximum image height of the display).

[0224] According to an embodiment, a wearable electronic device satisfying the following Formula 3 may be provided.

[0225] [Formula 3]

[0226] 80≤Fov≤100°

[0227] (Where Fov in conditional equation 3 is the field of view of the entire optical system).

[0228] According to an embodiment, the lenses included in the lens assembly may have positive refractive power, positive refractive power, negative refractive power, and positive refractive power in sequence from the user's eye side.

[0229] According to an embodiment, a wearable electronic device may be provided in which a difference in Abbe number between a third lens L3 and a fourth lens L4 from a user's eye side satisfies the following Formula 4.

[0230] [Formula 4]

[0231] 25≤V 4 -V 3 ≤40

[0232] (Where V in Formula 4 3 is the Abbe number of the third lens from the user's eye side, and V 4 is the Abbe number of the fourth lens from the user's eye side).

[0233] According to an embodiment, a wearable electronic device may be provided in which an angle of a principal ray incident from a display D to a lens satisfies the following Formula 5.

[0234] [Formula 5]

[0235] D CRA ≤35°

[0236] (where D in condition Equation 5 CRA is the angle of the chief ray incident on the lens from the display).

[0237] Although the present invention has been shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various changes in form and detail may be made thereto without departing from the spirit and scope of the present disclosure as defined by the appended claims. For example, in a specific embodiment of the present disclosure, the measurement values ​​of multiple lenses may be appropriately set according to the structure, specifications or actual use environment of the camera module and electronic device to be actually manufactured.

Claims

1. A wearable electronic device (100), comprising: at least four lenses, the at least four lenses being arranged along an optical axis (OI) from an eye side of a user to a display (D), the at least four lenses including a first lens and a second lens arranged in order farthest from the display; wherein the first lens (L1) includes at least one flat surface and a first quarter wave plate (QWP) (103) and a first refractive member (102) disposed on the at least one flat surface, wherein the second lens (L2) includes at least one convex surface and a second refractive member (104) disposed on the at least one convex surface, and Wherein, the wearable electronic device satisfies the following formula 1 and formula 2: [Formula 1] M12≥0.99 [Formula 2] TTL / ImgH≤1.75 (wherein, M12 in Formula 1 is the combined group magnification of the first lens and the second lens, TTL in Formula 2 is the "total top length", which indicates the distance between the eye-side surface of the first lens and the display, and ImgH in Formula 2 is the maximum image height of the display).

2. The wearable electronic device according to claim 1, wherein: The first refractive member (102) is a reflective polarizer and is laminated with the first quarter wave plate (103) to form a first film portion F1.

3. The wearable electronic device according to claim 1 or 2, wherein: The second refractive member (104) includes a beam splitter.

4. The wearable electronic device according to any one of claims 1 to 3, further comprising a second quarter wave plate (105) and a polarizer (106) arranged between the at least four lenses and the display.

5. The wearable electronic device according to any one of claims 1 to 4, wherein: The first lens (L1) includes a convex user-eye side surface (S2) and a flat display-side surface (S3).

6. The wearable electronic device according to any one of claims 1 to 4, wherein: The first lens (L1) includes a flat user-eye-side surface (S2) and a convex display-side surface (S3).

7. The wearable electronic device according to any one of claims 1 to 5, wherein: The wearable electronic device satisfies the following formula 3: [Formula 3] 80°≤Fov≤100° (Wherein, Fov in Formula 3 is the field of view of the entire optical system).

8. The wearable electronic device according to any one of claims 1 to 7, wherein: Each of the at least four lenses is a plastic lens.

9. The wearable electronic device according to any one of claims 1 to 8, wherein: At least one lens of the at least four lenses has an aspherical surface.

10. The wearable electronic device according to any one of claims 1 to 9, wherein: The first lens has positive refractive power, the second lens has positive refractive power, and wherein the at least four lenses include a third lens and a fourth lens, the third lens is arranged at a second position away from the display and has negative refractive power, and the fourth lens is arranged at a first position away from the display and has positive refractive power.

11. The wearable electronic device according to claim 10, wherein: The Abbe number difference between the third lens (L3) and the fourth lens (L4) satisfies the following formula 4, [Formula 4] 25≤V4-V3≤40 (in, V3 in Formula 4 is the Abbe number of the third lens, and V4 is the Abbe number of the fourth lens).

12. The wearable electronic device according to any one of claims 1 to 11, wherein: The angle of the principal ray incident on the lens from the display (D) satisfies the following formula 5, [Formula 5] D CRA ≤35° (in, D in Formula 5 CRA is the angle of the chief ray incident on the lens from the display).

13. The wearable electronic device according to any one of claims 1 to 12, wherein: The first lens (L1) and the second lens (L2) are configured to move in the optical axis direction to achieve diopter adjustment.

14. The wearable electronic device according to any one of claims 1 to 13, wherein: Augmented reality (AR), virtual reality (VR), mixed reality (MR) or extended reality (XR) is applied to the wearable electronic device.

15. The wearable electronic device according to any one of claims 1 to 14, wherein: The wearable electronic device is of a visual see-through (VST) type.

Images