WO2022071698A1

WO2022071698A1 - Optical engine using micro-led and electronic device including same

Info

Publication number: WO2022071698A1
Application number: PCT/KR2021/013132
Authority: WO
Inventors: 홍성빈; 김철귀; 박용현; 정용희; 최동옥
Original assignee: 삼성전자 주식회사
Priority date: 2020-09-29
Filing date: 2021-09-27
Publication date: 2022-04-07
Also published as: KR20220043702A

Abstract

Disclosed is an optical engine of a wearable electronic device, which comprises: a micro-LED array, the micro-LED array including a plurality of pixels; a transparent cover which is disposed above the micro-LED array and passes light output from the micro-LED array; and a circuit board which is disposed under the micro-LED array and supplies driving power and a control signal to at least one of the micro-LED array and the transparent cover. The transparent cover comprises: a first birefringence plate; a first liquid crystal element disposed on the first birefringence plate; a second birefringence plate disposed on the first liquid crystal element; a second liquid crystal element disposed on the second birefringence plate; and a polarization plate disposed on the second liquid crystal element. Various other embodiments identified through the present document are possible.

Description

Optical engine using micro LED and electronic device including same

Various embodiments disclosed in this document relate to an optical engine using a micro LED and an electronic device including the same.

As electronic communication technology develops, various types of devices that can be directly worn on the body have been developed. For example, the electronic device includes a head-mounted-display (HMD), augmented reality glass (AR glass), smart glasses, a smart watch, a smart band, and content. A lens-type device, a ring-type device, a glove-type device, or a shoe-type device, etc., are being developed in a form detachable to a user's body or in a form detachable to clothes.

Augmented reality glasses (or head-wearable display) may be worn on the user's head to provide the user with various contents using virtual reality (VR) and/or augmented reality (AR). Augmented reality glasses are gradually becoming smaller in order to increase portability, and technologies for outputting high-quality images from small augmented reality glasses are emerging.

Wearable electronic devices (eg, augmented reality glasses) are limited in volume because they must be worn on a user's body (eg, head). For example, in the case of lightweight and miniaturized spectacle-type augmented reality glasses, separate mechanical devices (such as actuators) are placed between the light source and the projection lens and/or between the projection lens and the waveguide. High-resolution images can be realized by shaking the light or reducing the size of each pixel included in the light source.

For high-quality images, if a separate mechanical device (eg, actuator) is used, the volume of the augmented reality glass may increase and power consumption may increase. In addition, when the size of the pixel is reduced, light output transmission efficiency may be reduced.

According to the embodiments disclosed in this document, a wearable electronic device is formed by stacking a birefringence plate, a double refraction plate, a wave plate, and a polarizer on a micro LED (light emitting diode). By disposing an integrally formed transparent cover and applying an electrical control signal to the transparent cover, it is possible to provide high-resolution output without using a separate mechanical device.

The technical problems to be achieved in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. There will be.

An optical engine of a wearable electronic device according to an embodiment may include a micro LED array, wherein the micro LED array includes a plurality of pixels; a transparent cover disposed above the micro LED array and passing light output from the micro LED array; and a circuit board disposed under the micro LED array and supplying driving power and control signals to at least one of the micro LED array and the transparent cover, wherein the transparent cover includes: a first birefringent plate; a first liquid crystal element disposed on the first birefringent plate; a second birefringent plate disposed on the first liquid crystal element; a second liquid crystal element disposed on the second birefringent plate; and a polarizing plate disposed on the second liquid crystal element.

A wearable electronic device according to an embodiment includes: a housing forming at least a part of an exterior of the wearable electronic device; an optical engine emitting light for outputting an image; and a transparent glass comprising a waveguide for guiding light emitted from the optical engine, wherein the optical engine comprises: a micro LED array, the micro LED array comprising a plurality of pixels; a transparent cover disposed above the micro LED array and passing light output from the micro LED array; and a circuit board disposed under the micro LED array and supplying driving power and control signals to at least one of the micro LED array and the transparent cover, wherein the transparent cover is: on the first birefringent plate ( on) a first liquid crystal element disposed; a second birefringent plate disposed on the first liquid crystal element; a second liquid crystal element disposed on the second birefringent plate; and a polarizing plate disposed on the second liquid crystal element.

According to various embodiments disclosed in this document, by disposing a transparent cover including a first birefringent plate, a first liquid crystal element, a second birefringent plate, a second liquid crystal element, and a polarizing plate on the upper side of the micro LED array, the micro LED array It can be output by vertically or horizontally shifting the light output from the .

According to various embodiments disclosed in this document, by vertically or horizontally shifting the light output from the low-resolution micro LED array and outputting it as a plurality of lights, a high-resolution image can be realized even when the low-resolution micro LED is used, , it is possible to reduce the volume of the optical engine.

According to various embodiments disclosed in this document, power consumption of an electronic device can be reduced by using a low-resolution micro LED instead of a high-resolution micro LED for realizing a high-resolution image.

In addition, various effects directly or indirectly identified through this document may be provided.

1 is a wearable electronic device worn by a user according to an exemplary embodiment.

2 is a perspective view of the wearable electronic device of FIG. 1 according to an exemplary embodiment.

3 is a block diagram of a wearable electronic device according to an exemplary embodiment.

4 is a diagram illustrating an internal structure of an optical engine of a wearable electronic device according to an exemplary embodiment.

5 is a diagram illustrating a micro LED array, a circuit board, and a micro lens array of an optical engine according to an exemplary embodiment.

6A is a diagram illustrating an operation of manufacturing a micro lens array of an optical engine according to an exemplary embodiment.

6B is a diagram illustrating a shape of each micro lens included in a micro lens array according to an exemplary embodiment.

7 is a diagram illustrating a coupling operation of a micro lens array and a micro LED array according to an exemplary embodiment.

8 is a diagram illustrating a laminated structure of a transparent cover of an optical engine according to an exemplary embodiment.

9A illustrates light passing through a first birefringent plate, a first liquid crystal element, and a second birefringent plate when power is supplied to the first liquid crystal element according to a control signal from the circuit board in the transparent cover according to an embodiment; It is a drawing.

9B is a view illustrating light passing through the first birefringent plate, the first liquid crystal element, and the second birefringent plate when power is not supplied to the first liquid crystal element according to the control signal of the circuit board in the transparent cover according to the embodiment; It is a drawing showing

10 is a table illustrating light output from a transparent cover according to a control signal of a circuit board according to an exemplary embodiment.

11 is a diagram illustrating a configuration of an image output passing through a transparent cover according to an exemplary embodiment.

12A is a diagram illustrating an optical engine disposed in a wearable electronic device according to an exemplary embodiment.

12B is a diagram illustrating light output from an optical engine of a wearable electronic device according to an exemplary embodiment.

13 is a block diagram of an electronic device in a network environment, according to various embodiments of the present disclosure;

In connection with the description of the drawings, the same or similar reference numerals may be used for the same or similar components.

Hereinafter, various embodiments disclosed in this document will be described with reference to the accompanying drawings. For convenience of description, the sizes of the components shown in the drawings may be exaggerated or reduced, and the present invention is not necessarily limited to the illustrated ones.

The electronic device according to various embodiments disclosed in this document may be a device of various types. The electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance device. The electronic device according to the embodiment of the present document is not limited to the above-described devices.

The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of the embodiments. In connection with the description of the drawings, like reference numerals may be used for similar or related components. The singular form of the noun corresponding to the item may include one or more of the item, unless the relevant context clearly dictates otherwise. As used herein, "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 "A , B, or C" each may include any one of the items listed together in the corresponding one of the phrases, or all possible combinations thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish the element from other elements in question, and may refer to elements in other aspects (e.g., importance or order) is not limited. It is said that one (eg, first) component is "coupled" or "connected" to another (eg, second) component, with or without the terms "functionally" or "communicatively". When referenced, it means that one component can be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term “module” used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, for example, and interchangeably with terms such as logic, logic block, component, or circuit. can be used A module may be an integrally formed part or a minimum unit or a part of the part that performs one or more functions. For example, according to an embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

According to an embodiment, the method according to various embodiments disclosed in this document may be provided by being included in a computer program product. Computer program products may be traded between sellers and buyers as commodities. The computer program product is distributed in the form of a machine-readable storage medium (eg compact disc read only memory (CD-ROM)), or via an application store (eg Play Store ^TM ) or on two user devices ( It can be distributed online (eg download or upload), directly between smartphones (eg smartphones). In the case of online distribution, at least a part of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.

According to various embodiments, each component (eg, a module or a program) of the above-described components may include a singular or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. . According to various embodiments, one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg, a module or a program) may be integrated into one component. In this case, the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component are executed sequentially, in parallel, repetitively, or heuristically, or one or more of the operations are executed in a different order, omitted, or , or one or more other operations may be added.

1 is a wearable electronic device 100 worn by a user 102 according to an embodiment.

Referring to FIG. 1 , the wearable electronic device 100 includes a near to eye display (NED) device, a head-mounted-display (HMD) device that can be worn by a user 102, It may be one of electronic devices including augmented reality glass (AR glass) and smart glasses. The near-eye display device may be understood as a display device in which the image display unit is located very close to the eye of the user 102 and the user 102 can wear it like glasses. 1 illustrates an embodiment in which a user 102 wears the wearable electronic device 100, for example, a near-eye display device.

According to an embodiment, the wearable electronic device 100 includes a display 104 corresponding to a near-eye display (eg, a first see-through display 104-1, a second see-through display ( 104-2)) may be included. The see-through display 104 may be included in at least some of the glasses of the wearable electronic device 100 . For example, the wearable electronic device 100 may include a light waveguide in at least a portion of the glass, and one region of the light guide may correspond to the see-through display 104 . The see-through display 104 may be located close to the eye of the user 102 , and the user 102 may wear the wearable electronic device 100 including the see-through display 104 like glasses.

In various embodiments of the present disclosure, the see-through display 104 transmits the image (or light) output from the optical engine (eg, the optical engine 230 in FIG. 2 ) of the user 102 through the optical waveguide included in the glass. It may refer to a display that transmits to the eyes and at the same time transmits the real world through the area to the user's 102 see-through eyes.

According to an embodiment, the optical waveguide may include glass, plastic, or polymer, and at least a portion (inside or outside) of the optical waveguide may include a grating structure. For example, the lattice structure may be formed in a polygonal or curved shape, and may include nanopatterns. For example, the light transmitted from the optical engine 230 and/or the user 102 may be changed in a traveling direction by the nano-pattern.

According to an embodiment, the wearable electronic device 100 may display an augmented reality image through the see-through display 104 . According to an embodiment, the see-through display 104 may transmit light in the real environment (or real object), and the user 102 recognizes the light in the real environment transmitted through the see-through display 104, You can see the environment. According to an embodiment, the see-through display 104 may be understood as a transparent display capable of simultaneously/sequentially displaying images of a virtual object while transmitting light of a real object. For example, the user 102 may recognize a real object through the see-through display 104 of the wearable electronic device 100 , and may recognize a virtual object superimposed thereon. The see-through display 104 may be made of a transparent material such as glass or plastic.

Various embodiments of this document describe the wearable electronic device 100 in the form of glasses as a main scenario, but the present disclosure is not limited thereto, and various embodiments of the present document may be applied to various electronic devices including optical devices. For example, various embodiments of the present document may be applied to an HMD device or augmented reality glasses in the form of goggles.

2 is a perspective view of the wearable electronic device 100 of FIG. 1 according to an embodiment.

Referring to FIG. 2 , the wearable electronic device 100 includes a first glass 201 including a first see-through display 104-1 and a second glass 202 including a second see-through display 104-2. , a connecting member 210 connecting the first glass 201 and the second glass 202 , a first member 211 adjacent to the first glass 201 and surrounding the first glass 201 , the first A second member 221 extending from the member 211 , a third member 212 adjacent to the second glass 202 and surrounding the second glass 202 , and a fourth member extending from the third member 212 . A member 222 may be included. According to an embodiment, the first member 211 and the third member 212 may be understood as eyeglass frames of the wearable electronic device 100 , and the second member 221 and the fourth member 222 may be connected to the user ( It may be understood as a temple of the wearable electronic device 100 supporting the ear of 102 .

Hereinafter, a duplicate description due to the substantially symmetrical structure of the wearable electronic device 100 will be omitted.

According to an embodiment, the first glass 201 and/or the second glass 202 may be formed of a glass plate and/or a polymer, and may be made transparent and/or translucent. there is. According to an embodiment, the first member 211 , the third member 212 and the connecting member 210 may be integrally formed.

According to an embodiment, components included in the wearable electronic device 100 are not limited to the components illustrated in FIG. 2 . For example, the wearable electronic device 100 may further include a sensor (eg, an eye tracking sensor, an illuminance sensor) and/or a camera. The eye tracking sensor is a camera that detects light reflected from the eye (eg, a pupil) of the user 102 , and the wearable electronic device 100 provides the user 102 based on the light detected through the eye tracking sensor. ) can be tracked (or the trajectory of the gaze). The illuminance sensor is a sensor that detects the illuminance (or brightness) around the user's 102 eyes or the wearable electronic device 100, and the wearable electronic device 100 detects the illuminance (or brightness) around the illuminance sensor. Based on the , the optical engine 230 to be described later may be controlled. For example, the eye tracking sensor (eg, the camera module 340 of FIG. 3 ) may acquire a reflection pattern of light emitted to the user's 102 eye. For example, the eye tracking sensor may photograph a reflection pattern of light emitted from a light emitting unit (not shown) (eg, IR (infra-red) LED) of the electronic device 100 to the user's eye, and a global shutter It may be configured as a (global shutter; GS) type camera. Also, the eye tracking sensor may be configured as a sensor module (eg, the sensor module 320 of FIG. 3 ). For example, the eye tracking sensor may include at least one of a vertical cavity surface emitting laser (VCSEL), an infrared sensor, and/or a photodiode. For example, the photodiode may include a positive intrinsic negative (PIN) photodiode or an avalanche photodiode (APD). The photodiode may be referred to as a photo detector or a photo sensor.

According to an embodiment, the eye tracking sensor may track the user's eye or gaze using a plurality of camera modules (eg, the camera module 340 of FIG. 3 ) having the same standard and performance. For example, it may be composed of a plurality of camera modules for the left (left) eye and a plurality of camera modules for the right (right) eye.

According to an embodiment, the light emitting unit (not shown) may emit light in an infrared band to facilitate eye tracking (or eye trajectory) using the eye tracking sensor. According to another embodiment, the light emitting unit (not shown) may emit light in a visible light band and may include a light emitting diode (LED).

According to an embodiment, the wearable electronic device 100 includes a self-luminous display (eg, micro LED, organic light emitting diode (OLED)) or a display requiring a separate light source (eg, liquid crystal display (LCD); It may include a liquid crystal on silicon (LCoS), a digital mirror device (DMD)). For example, the self-luminous display may be understood as a display capable of outputting an image by emitting light from the display itself. Also, a display requiring a separate light source may be understood as a display capable of outputting an image by reflecting and/or emitting light emitted from a separate light source. In the embodiment of the present disclosure, only the wearable electronic device 100 using the micro LED among the self-luminous displays will be described.

According to an embodiment, the wearable electronic device 100 may include an optical engine 230 that emits light for outputting an image. According to an embodiment, the optical engine 230 may include a micro LED module emitting light from itself, and the light for outputting the image may be understood as light emitted from the micro LED module. For example, a first optical engine 231 for the left (left) eye and a second optical engine 232 for the right (right) eye, as optical engine 230 is needed, one each for each eye of user 102 . ) can be composed of The left and right sides may be divided based on the user 102 . According to another embodiment, the wearable electronic device 100 may include one optical engine 230 , and in this case, the output of the optical engine 230 may be divided and supplied to both eyes of the user 102 .

According to an embodiment, the first optical engine 231 and the second optical engine 232 may be disposed on at least one surface inside or outside the components constituting the wearable electronic device 100 . For example, the first optical engine 231 and the second optical engine 232 may include a connecting member 210 , a first member 211 , a second member 221 , a third member 212 , and a fourth member 212 . It may be disposed on one surface of the inside or outside of at least one of the members 222 . As another example, as in the wearable electronic device 100 illustrated in FIG. 2 , the first optical engine 231 may be disposed on the inner surface of the second member 221 , and A second optical engine 232 may be disposed on the inner surface. According to one embodiment, the first optical engine 231 and / or the second optical engine 232, the light emitted from the first optical engine 231 and / or the second optical engine 232 is the first glass It may be arranged to be incident on the 201 and/or the second glass 202 . However, the positions of the first optical engine 231 and/or the second optical engine 232 are not limited to the example shown in FIG. 2 , and for example, the first optical engine 231 and/or the second optical engine 231 . The engine 232 may be disposed on the first member 211 and/or the third member 212 .

According to an embodiment, the optical waveguide may be disposed on the first glass 201 and the second glass 202, respectively. However, the present invention is not limited thereto. For example, the optical waveguide may be disposed on at least one of the first glass 201 and the second glass 202 . The optical waveguide may include a display waveguide (eg, a first waveguide) corresponding to a path through which display light emitted from the first optical engine 231 and/or the second optical engine 232 is propagated, and It may further include a gaze tracking waveguide (eg, a second waveguide) corresponding to a path through which the reflected light reflected from the eye of the user 102 propagates. According to an embodiment, light emitted from the micro LEDs of the first optical engine 231 and/or the second optical engine 232 may reach the eye of the user 102 through the display waveguide.

According to an embodiment, the display waveguide may form a light path by guiding the display light emitted from the optical engine 230 to be emitted to the display area of the see-through display 104 . According to an embodiment, the see-through display 104 may correspond to at least one region of the display waveguide. According to an embodiment, the display waveguide may be a free form waveguide. The free-form display waveguide may provide the light generated by the optical engine 230 to the user 102 by using the input optical member and the output optical member.

According to an embodiment, the display waveguide may include at least one of at least one diffractive element (eg, a diffractive optical element (DOE), a holographic optical element (HOE)) and/or a reflective element (eg, a reflective mirror). there is. The display waveguide may guide the display light emitted from the optical engine 230 to the eye of the user 102 using at least one diffractive element or a reflective element included in the display waveguide. According to an embodiment, the at least one diffractive element may include an input optical element and/or an output optical element, and the reflective element may include a splitter configured to perform total internal reflection (TIR). can For example, the display light emitted from the optical engine 230 may be guided by an optical path to the optical waveguide through the input optical member, and the light traveling inside the optical waveguide may be directed toward the eye of the user 102 through the output optical member. can be induced to In addition, the eye tracking waveguide may transmit the light reflected from the user 102 to the eye tracking sensor using a splitter. According to an embodiment, the position of the light provided to the user 102 by the optical engine 230 may be determined based on the light (eg, the trajectory of the gaze) reflected from the user 102 transmitted to the eye tracking sensor. there is.

According to an embodiment, an optical material (eg, glass) may be processed into a wafer shape and used as the display waveguide. The refractive index of the display waveguide may have a value of about 1.5 to about 2.2, but is not limited thereto. According to an embodiment, the display waveguide may separate the display light emitted from the optical engine 230 according to a wavelength (eg, blue, green, or red) to move it to a separate path within the display waveguide. .

According to an embodiment, the display waveguide may be disposed on glass (eg, the first glass 201 and the second glass 202). For example, based on a virtual axis that coincides with the center point of the glass and the center point of the user's 102 eye, and a virtual line orthogonal to the virtual axis and the center point of the glass, the upper and lower ends of the glass can be distinguished, , the display waveguide may be disposed on top of the glass. However, the region in which the display waveguide is disposed is not limited to the above-described region of the glass.

According to an embodiment, the first member 211 is not limited to the shape shown in FIG. 2 . For example, the first member 211 may have a shape surrounding at least a portion of the periphery of the first glass 201 . This may be equally applied to the third member 212 .

According to an embodiment, the second member 221 is not limited to the shape shown in FIG. 2 . For example, the second member 221 may have a shape that can be mounted on a body part (eg, an ear or a head) of the user 102 . This may be equally applied to the fourth member 222 . As another example, the second member 221 may have a shape that allows the wearable electronic device 100 to be worn on the head of the user 102 .

According to an embodiment, the connecting member 210 , the first member 211 , the second member 221 , the third member 212 , and the fourth member 222 are integrally connected and combined into one package. It may include a form that has been

According to an embodiment, the wearable electronic device 100 includes a first see-through display 104 - 1 included in the first glass 201 and a second see-through display 104 - 2 included in the second glass 202 . may include The first see-through display 104 - 1 and the second see-through display 104 - 2 may include a transparent display capable of transmitting light of a real object and displaying a virtual object image. For example, the user 102 may recognize a real object through the see-through display 104 , and may recognize the real object and the virtual object image by superimposing them.

Referring to FIG. 3 , the wearable electronic device 100 includes a processor 300 , an optical engine 400 (eg, the optical engine 230 of FIG. 2 ), a sensor module 310 , an audio module 320 , and a battery ( or a power supply) 330 , a camera module 340 , and a communication interface 350 . A module included in the wearable electronic device 100 may be understood as a hardware module (eg, a circuit) included in the wearable electronic device 100 . Components included in the wearable electronic device 100 include components shown in the block diagram of FIG. 3 (eg, an optical engine 400, a sensor module 310, an audio module 320, a battery 330, The camera module 340 or the communication interface 350 may not be limited. Components of the wearable electronic device 100 illustrated in FIG. 3 may be replaced with other components, and other components may be added to the wearable electronic device 100 . For example, the wearable electronic device 100 may further include a memory in the components illustrated in FIG. 3 .

According to an embodiment, the processor 300 executes instructions (eg, instructions) stored in the memory to configure components (eg, the optical engine 400 and the sensor module 310 of the wearable electronic device 100 ). ), the audio module 320 , the battery 330 , the camera module 340 , and the communication interface 350 ). The processor 300 may be electrically and/or operatively connected to the optical engine 400 , the sensor module 310 , the audio module 320 , the battery 330 , the camera module 340 , and the communication interface 350 . can The processor 300 executes software and includes at least one other component connected to the processor 300 (eg, the optical engine 400 , the sensor module 310 , the audio module 320 , the battery 330 , and the camera module). 340 , and the communication interface 350 ). The processor 300 may obtain a command from components included in the wearable electronic device 100 , interpret the obtained command, and process and/or calculate various data according to the interpreted command. can

According to an embodiment, the processor 300 may adjust the position of the virtual image so that the virtual object image projected on the see-through display 140 corresponds to the direction in which the eye (pupil) of the user 102 gazes. Also, the processor 300 may determine the movement of the wearable electronic device 100 and/or the movement of the user 102 using the sensor module 310 and/or the camera module 340 . For example, the processor 300 receives the state information of the wearable electronic device 100 and/or the camera module 340 obtained by using the sensor module 310 (eg, a gesture sensor, a gyro sensor, or an acceleration sensor). The movement of the wearable electronic device 100 and/or the movement of the user 102 may be determined using the user's motion (eg, the user's 102's body approach to the wearable electronic device 100) can According to an embodiment, the wearable electronic device 100 may receive data processed through a processor built in an external device (eg, a mobile terminal) from the external device. For example, the wearable electronic device 100 may photograph an object (eg, a real object or an eye of the user 102 ) through the camera module 340 , and transmit the captured image to an external device through the communication interface 350 . and may receive data based on the transmitted image from the external device. The external device generates image data related to augmented reality based on information (eg, shape, color, or location) of the photographed object received from the wearable electronic device 100 , and transmits the image data to the wearable electronic device 100 . can

According to an embodiment, the optical engine 400 may include a micro LED module.

According to an embodiment, the micro LED module may emit display light for displaying an augmented reality image based on the control of the processor 300 . A micro LED can be understood as a self-luminous display that emits light from the display itself. For example, the wearable electronic device 100 (eg, the processor 300 ) may emit display light for displaying the augmented reality image on the display area of the see-through display 104 through the optical engine 400 . As another example, in response to the input of the user 102 , the wearable electronic device 100 (eg, the processor 300 ) uses the optical engine 400 to display the augmented reality image in the display area of the see-through display 104 . ) can be controlled. Types of input of user 102 may include, but are not limited to, button input, touch input, voice input, and/or gesture input, which may include various input types capable of controlling operation of optical engine 400 . can

According to an embodiment, the sensor module 310 may include at least one sensor (eg, a gaze tracking sensor and/or an illuminance sensor). The at least one sensor may not be limited to the above-described example. For example, the at least one sensor may further include a proximity sensor or a contact sensor capable of detecting whether the user 102 wears the wearable electronic device 100 . The wearable electronic device 100 may detect whether the user 102 is wearing the wearable electronic device 100 through the proximity sensor or the contact sensor. For example, when the user 102 detects that the wearable electronic device 100 is being worn, the wearable electronic device 100 is manually and/or automatically paired with another electronic device (eg, a smartphone) (eg, a smart phone). pairing) is possible.

According to an embodiment, the audio module 320 may convert a sound into an electric signal or, conversely, convert an electric signal into a sound. The audio module 320 may include a device capable of acquiring a sound (eg, a microphone) and/or a device capable of outputting a sound (eg, a speaker). According to an embodiment, the wearable electronic device 100 may receive an external sound such as a voice of the user 102 through a microphone, and may output a sound corresponding to an image displayed through a speaker. According to an embodiment, the audio module 320 includes at least one of the first member 211 , the second member 221 , the third member 212 , the fourth member 222 , and/or the connection member 210 . Some may be placed. For example, the at least one audio module 320 may be disposed at the lower end and/or upper end of the wearable electronic device 100 . According to an embodiment of the present disclosure, the wearable electronic device 100 may more clearly recognize the user's voice using voice information (eg, sound) acquired by the at least one audio module 320 . For example, the wearable electronic device 100 may distinguish between the voice information and ambient noise based on the acquired voice information and/or additional information (eg, low-frequency vibration of the user's skin and bones). For example, the wearable electronic device 100 may clearly recognize a user's voice and may perform a function of reducing ambient noise (eg, noise canceling).

According to an embodiment, the battery 330 may supply power to at least one component of the wearable electronic device 100 . The battery 330 may be charged by being connected to an external power source by wire or wirelessly. For example, the wearable electronic device 100 may include a connection terminal (eg, a universal serial bus (USB) connector) for connecting to an external power source by wire, and is electrically connected to an external electronic device through the connection terminal. and transmits the power received from the external electronic device to components of the wearable electronic device 100 .

According to an embodiment, the camera module 340 may capture an image around the wearable electronic device 100 . For example, the camera module 340 may capture an image of a real object outside the wearable electronic device 100 , and the captured object is transmitted to the user through the optical engine 400 (eg, the optical engine 230 of FIG. 2 ). can be displayed to For example, the camera module 340 may be a camera of a global shutter method or a rolling shutter (RS) method. The camera module 340 may be configured as a high-resolution color camera, and may be referred to as a high resolution (HR) or photo video (PV) camera. Also, the camera module 340 may provide an auto focus function (AF) and an optical image stabilizer (OIS) function. Also, the wearable electronic device 100 may include a light emitting unit (not shown) at a position close to the camera module 340 . For example, the light emitting unit (not shown) may provide brightness (eg, illuminance) around the wearable electronic device 100 when an external image of the camera module 340 is acquired, in a dark environment, mixing of various light sources, and/or avoiding difficulties in image acquisition due to reflection.

According to an embodiment, the first camera module may provide 360-degree spatial (eg omnidirectional), positional and/or movement recognition with a camera that supports 3DoF (degrees of freedom), or 6DoF. there is. For example, the first camera module uses a plurality of global shutter (GS) type cameras of the same standard and performance as a stereo camera to perform simultaneous localization and mapping (SLAM) and user movement It can perform a recognition function.

According to an embodiment, the communication interface 350 may include a wired interface and/or a wireless interface. The communication interface 350 may support direct communication (eg, wired communication) or indirect communication (eg, wireless communication) between the wearable electronic device 100 and an external device (eg, a mobile terminal).

Hereinafter, the structure and light output principle of the optical engine 400 of the wearable electronic device 100 will be described in detail with reference to FIGS. 4 to 12B .

4 is a diagram illustrating an internal structure of the optical engine 400 of the wearable electronic device 100 according to an exemplary embodiment.

Referring to FIG. 4 , the optical engine 400 of the wearable electronic device 100 is disposed above a micro LED array 410 , and above the micro LED array 410 , and the micro LED array 410 . It may include a transparent cover 450 that passes the light output from the. In addition, the transparent cover 450 includes a first birefringent plate 451 , a first liquid crystal element 452 , a second birefringent plate 453 , a second liquid crystal element 454 , and/or a polarizing plate 455 . can do. According to another embodiment, the optical engine 400 may further include a micro lens array 430 disposed between the micro LED array 410 and the transparent cover 450 .

According to an embodiment, the light emitted from each pixel constituting the micro LED array 410 passes through the micro lens array 430 and then the first birefringent plate 451 constituting the transparent cover 450, the second It may pass through the first liquid crystal element 452 , the second birefringent plate 453 , the second liquid crystal element 454 , and the polarizing plate 455 . In the present disclosure, light, light, or light beam may be used interchangeably.

According to an embodiment, the micro lens array 430 may control the degree of spreading of the light emitted from the micro LED array 410 . For example, light emitted from each pixel constituting the micro LED array 410 may be more dispersed and emitted while passing through the micro lens array 430 , or may be more constricted and emitted. According to an embodiment, the micro lens array 430 may be used to increase light transmission efficiency through which light emitted from the micro lens array 430 is projected onto the transparent cover 450 . According to another embodiment, the micro lens array 430 may be selectively used, and may be omitted from the optical engine 400 .

According to an embodiment, the transparent cover 450 may change the traveling direction of light emitted from the micro LED array 410 (eg, light passing through the micro lens 433 ). According to an embodiment, the transparent cover 450 may shift the light emitted from the micro LED array 410 up, down, left, and right to output various types of light. For example, the transparent cover 450 may output the light emitted from the micro LED array 410 by moving it up, down, left, and right by 1/2 of the pixel size constituting the micro LED array 410 . . According to an embodiment, the transparent cover 450 may be used to provide a user with an image having a higher resolution than the native resolution of the micro LED array 410 . According to an embodiment, the light incident to the transparent cover 450 may be an unpolarized light beam. According to another embodiment, the light incident to the transparent cover 450 may be a polarized light. A first birefringent plate 451 , a first liquid crystal element 452 , a second birefringent plate 453 , and a second liquid crystal element 454 depending on the type of light incident to the transparent cover (eg, polarized light or non-polarized light) The arrangement order may be different. In the present disclosure, an embodiment in which unpolarized light rays are incident to the transparent cover 450 will be described.

According to an embodiment, the transparent cover 450 is formed on the first birefringent plate 451 , the first liquid crystal element 452 disposed on the first birefringent plate 451 , and the first liquid crystal element 452 . a second birefringent plate 453 disposed on the second birefringent plate 453 , a second liquid crystal element 454 disposed on the second birefringent plate 453 , and a polarizing plate 455 disposed on the second liquid crystal device 454 . can However, the number and/or stacking order of the components constituting the transparent cover 450 is not limited thereto, and the transparent cover 450 is installed depending on whether the light output from the micro LED array 410 is polarized or unpolarized. It can vary depending on the resolution you want to improve through the light passing through. For example, when the light incident on the transparent cover 450 is a polarized light, the transparent cover 450 may further include a wave plate, in which case the wave plate is a first birefringent plate of the transparent cover 450 . The stacking order of the first birefringent plate 451 , the second birefringent plate 453 , the first liquid crystal element 452 , and the second liquid crystal element 454 may be different.

According to an embodiment, the birefringent plate (eg, the first birefringent plate 451 and the second birefringent plate 453 ) converts the incident light according to the polarization and the propagation direction of the light passing through the birefringent plate into two refracted lights. can be refracted. For example, when unpolarized light is incident on the first birefringent plate 451 and/or the second birefringent plate 453 , the unpolarized light is separated into an ordinary ray and an extraordinary ray and output can be According to an embodiment, the first birefringent plate 451 and/or the second birefringent plate 453 may be made of quartz or sapphire, and the first birefringent plate 451 and/or the second birefringent plate 453 may be used. The separation width (d) of the ordinary ray and the extraordinary ray may vary depending on the material constituting the ray. In the present disclosure, the ray separation width d of light passing through the first birefringent plate 451 and/or the second birefringent plate 453 is 1/2 of the pixel size constituting the micro LED array 410 . A birefringent plate can be configured so that it becomes this. In the case of FIG. 4 , only two rays separated by the first birefringent plate 451 are illustrated, but the separated rays may be further separated while passing through the second birefringent plate 453 .

According to an embodiment, the liquid crystal element (eg, the first liquid crystal element 452 and the second liquid crystal element 454 ) may be composed of liquid crystal, which is a material in a state between a liquid and a solid crystal. According to an exemplary embodiment, the first liquid crystal element 452 and/or the second liquid crystal element 454 includes electrical signals (power, control) supplied to the first liquid crystal element 452 and/or the second liquid crystal element 454 . signal) can be controlled. A control signal for controlling the first liquid crystal element 452 and/or the second liquid crystal element 454 may be supplied from a circuit board (refer to the circuit board 470 of FIG. 5 ) to be described later, and the liquid crystal element is configured on the circuit board It is possible to change the polarization state (eg, polarization direction) of the incident light based on the control signal supplied from the . According to an embodiment, the liquid crystal element (eg, the first liquid crystal element 452 and the second liquid crystal element 454 ) may include a wave plate, a polarizing layer, or a polarizer, or a phase retardation layer ( It can act as a retardation layer, or retarder). For example, the liquid crystal element (eg, the first liquid crystal element 452 and the second liquid crystal element 454 ) may operate as a 'circular polarization layer'. According to an embodiment, the liquid crystal element (eg, the first liquid crystal element 452 and the second liquid crystal element 454 ) may serve as a half-wave plate or a quarter-wave plate. According to an embodiment, the liquid crystal element (eg, the first liquid crystal element 452 , the second liquid crystal element 454 ) may be powered or not powered by a switch operation while the electrode is connected to the transparent film.

According to an embodiment, the polarizing plate 455 may refer to a thin plate that changes to linearly polarized light when natural light (eg, unpolarized light) is transmitted. According to another embodiment, when polarized light is projected onto the polarizing plate 455 , output may vary depending on the polarization direction of the incident polarized light and the polarization direction of the polarizing plate 455 . For example, the polarizing plate 455 may output only light corresponding to the polarization direction of the polarizing plate 455 among incoming light. For example, when the polarization direction of the incident polarized light is perpendicular to the polarization direction of the polarizing plate 455 , light output from the polarizing plate 455 may not exist. 5 is a diagram illustrating a micro LED array 410 , a circuit board 470 , and a micro lens array 430 of the optical engine 400 according to an exemplary embodiment.

Referring to FIG. 5 , the micro LED array 410 may include a plurality of pixels 411 , and a barrier rib 413 may be disposed between each pixel 411 . According to an embodiment, a micro lens array 430 may be disposed on an upper side of the micro LED array 410 , and a circuit board 470 may be disposed on a lower side of the micro LED array 410 .

According to an embodiment, the barrier rib 413 disposed between the pixels 411 in the micro LED array 410 prevents light emitted from one pixel 411 from affecting the other pixels 411 . and increase the light transmission efficiency. For example, the barrier rib 413 may include a silica-based inorganic material or an organic material such as polyacrylates resin or polyimides resin. According to an embodiment, the barrier rib 413 may include a light blocking material to block light. For example, when the barrier rib 413 includes a light blocking material, it is possible to prevent color mixing of light generated from at least one pixel 411 and light generated from other adjacent pixels 411 . Also, the barrier rib 413 may include an opaque material and serve to block light. According to an embodiment, the pixel 411 constituting the micro LED array 410 may include a red pixel, a green pixel, and a blue pixel. Referring to FIG. 5 , in the case of a red pixel, a red component may be formed by disposing a quantum dot (QD), a quantum crystal (QC), and/or a color filter on a blue pixel. Alternatively, the green pixel may also create a green component by disposing a quantum dot (QD), a quantum crystal (QC), and/or a color filter on the blue pixel. For example, the micro LED array 410 may form RGB pixels. According to another embodiment, the pixels 411 constituting the micro LED array 410 do not use QD (quantum dot), QC (quantum crystal), and/or color filters, but red pixels, green pixels, and Each may be composed of blue pixels.

According to an embodiment, the micro lens array 430 may control the degree of emission of light emitted from the pixels 411 of the micro LED array 410 . For example, the micro lens array 430 may adjust the beam angle of light output from the pixel 411 . For example, by arranging each micro lens (eg, the micro lens 433 of FIG. 6A ) included in the micro lens array 430 above each pixel 411 included in the micro LED array 410 , light It is possible to determine the degree of divergence and to reduce light loss scattered in all directions.

According to an embodiment, the circuit board 470 may supply driving power and/or a control signal to at least one of the micro LED array 410 and the transparent cover 450 (eg, the transparent cover 450 in FIG. 4 ). , it is possible to simultaneously supply driving power and/or control signals to the micro LED array 410 and the transparent cover 450 . For example, the circuit board 470 includes at least one of a micro LED array 410 and a transparent cover (eg, the first liquid crystal element 452 and the second liquid crystal element 454 in FIG. 4 ) for driving power and/or control. A circuit for supplying a signal may be provided. In the present disclosure, the circuit board 470 may refer to a backplane or a silicon substrate. According to an embodiment, the circuit board 470 may include a flexible substrate made of a transparent material. For example, the circuit board 470 may be a colorless, transparent polymer film. For example, the circuit board 470 is polyethylene terephthalate (PET: polyethylene terephthalate), polyethylene naphthalate (PEN: polyethylene naphthalate), polyethylene sulfide (PES: polyethylene sulfide), polyethylene (PE: polyethylene), polyimide ( PI: polyimide) may include at least one material.

According to an embodiment, the circuit board 470 may control the light or image output from the micro LED array 410 by controlling the micro LED array 410, and control the output of the transparent cover 450 to The output light or image can be shaken. According to an embodiment, the electrical signal (power and control signal) supplied from the circuit board 470 to the micro LED array 410 and the electrical signal supplied from the circuit board 470 to the transparent cover 450 pass through the same path ( path) can be designed. For example, the circuit board 470 may be driven by synchronizing a signal of a virtual image (eg, a control signal of the micro LED array 410 ) and a signal of the transparent cover 450 . According to another embodiment, an electrical signal (eg, power and control signal) supplied from the circuit board 470 to the micro LED array 410 and an electrical signal supplied from the circuit board 470 to the transparent cover 450 are different. It may be designed to have a path. According to another embodiment, a control signal (eg, a control signal for the micro LED array 410 and/or the transparent cover 450 ) is controlled through an AP (application processor) or a micro LED driving circuit configured independently of the AP. (not shown) may be used.

Hereinafter, a method of manufacturing the micro lens array 430 will be described with reference to FIGS. 6A and 6B .

6A is a diagram illustrating an operation of manufacturing the micro lens array 430 of the optical engine 400 according to an embodiment, and FIG. 6B is each micro lens included in the micro lens array 430 according to an embodiment. It is a figure which shows the shape of (433).

According to an embodiment, the micro lens array 430 may include a transparent glass 431 (or a transparent plate) and a plurality of micro lenses 433 disposed on the transparent glass 431 . Referring to FIG. 6A , after applying a photoresist on the transparent glass 431 and putting a mask that matches the profile (eg, size and/or shape) of the micro lens 433 to be manufactured, ultraviolet (UV) light is applied. rays) can be emitted. In this case, the region except for the portion covered by the mask may be melted away by ultraviolet rays, and the remaining photoresist portion may be processed to obtain a microlens 433 having a desired size.

According to an embodiment, in the operation of processing the remaining photoresist that is not melted by the ultraviolet rays, the microlens 433 having a desired shape may be made by using

Equations

1 and 2 above. 6B, in

Equations

1 and 2, R is the radius of curvature of the micro lens 433, h is the height of the micro lens 433, f is the focal length of the micro lens 433, n is the refractive index of the microlens 433, λ is the wavelength of incident light, r is the distance to the optical axis, and K is a constant (or optical constant). According to an embodiment, the shape of the microlens 433 may vary according to a target beam angle.

7 is a diagram illustrating a coupling operation of the micro lens array 430 and the micro LED array 410 according to an embodiment.

Referring to FIG. 7 , the micro lens array 430 manufactured through the operation of FIGS. 6A and 6B may be disposed on the micro LED array 410 . For example, the micro LED array 410 and the micro lens array 430 may be coupled with an adhesive. For another example, the micro-lens 433 may be formed integrally directly on the pixel 411 of the micro-LED array 410 . In this case, the center of each micro lens 433 included in the micro lens array 430 may be arranged to be aligned with the center of each pixel 411 included in the micro LED array 410 . According to another embodiment, the center of each micro lens 433 included in the micro lens array 430 is a pixel 411 located in the center of the micro LED array 410 and the peripheral portion in the micro LED array 410 . The pixels 411 positioned in ? may be disposed differently from each other. For example, in the case of the pixel 411 located in the center of the micro LED array 410 , the center of the pixel 411 and the center of the micro lens 433 may be aligned, and the micro LED array 410 . In the case of the pixel 411 located in the inner periphery, the center of the pixel 411 may be disposed closer to the center of the micro LED array 410 than the center of the micro lens 433 . That is, in the case of the pixel 411 located in the periphery of the micro LED array 410 , the center of the pixel 411 and the center of the micro lens 433 may be disposed not to be aligned. According to another embodiment, in the wearable electronic device 100 , the micro lens array 430 may be omitted.

8 is a diagram illustrating a stacked structure of the transparent cover 450 of the optical engine 400 according to an exemplary embodiment.

Referring to FIG. 8 , unpolarized light is incident on the transparent cover 450 and may be output as it is incident or may be moved vertically or horizontally to be output. For example, the unpolarized light may include a first birefringent plate 451 , a first liquid crystal element 452 , a second birefringent plate 453 , a second liquid crystal element 454 , and a polarizing plate 455 in the transparent cover 450 . ), it may be output as it is incident, or may be output in a parallel movement direction.

According to an embodiment, when unpolarized light is incident on the first birefringent plate 451, the first birefringent plate 451 separates the incident light into an ordinary ray that outputs the incident light without refraction and an abnormal ray that is refracted and output. can In this case, according to the material and/or shape of the first birefringent plate 451 , the size of the width at which the light beam is separated may be adjusted.

According to an embodiment, using Equation 3, the separation width d of the ordinary ray and the extraordinary ray passing through the first birefringent plate 451 (or the second birefringent plate 453 ) is the pixel 411 . The thickness t of the first birefringent plate 451 (or the second birefringent plate 453 ), the ordinary ray refractive index n _o , and/or the extraordinary ray refractive index ne _e ) to be 1/2 of the size. can be adjusted

According to an embodiment, by using Equation 4, the angle a at which the ordinary ray and the extraordinary ray are separated (or shifted) may be obtained. In Equation 4, θ is a birefringent orientation angle of the birefringent plate, n _o is an ordinary ray refractive index, and n _e is an extraordinary ray refractive index.

According to an embodiment, the thickness t of the first birefringent plate 451 (or the second birefringent plate 453 ) may be obtained using Equation 5 above. In Equation 5, a is an angle at which the ordinary ray and the extraordinary ray are separated (or shifted), and d is the separation width between the ordinary ray and the extraordinary ray.

For example, the first birefringent plate 451 (or the second birefringent plate) having an ordinary refractive index n _o of 1.77 nm, an extraordinary ray refractive index ne _e of 1.762 nm, and a birefringence orientation angle θ of 45 degrees. (453)) and using the pixel 411 having a size of 5.4 μm, if calculated using the above equations, the value of the angle a at which the ordinary ray and the extraordinary ray are separated (or shifted) is 0.26 The value of the separation width d of the ordinary ray and the extraordinary ray is derived to be 2.7 μm, and the value of the thickness t of the first birefringent plate 451 (or the second birefringent plate 453) is 0.6 can be derived in mm.

According to an embodiment, light (eg, ordinary ray and extraordinary ray) passing through the first birefringent plate 451 may be incident on the first liquid crystal element 452 positioned adjacent to the first birefringent plate 451 . . In this case, the first liquid crystal element 452 may change the polarization state of the incident light according to the control signal supplied from the circuit board 470 . For example, the first liquid crystal element 452 may rotate the polarization direction of the incident light based on the control signal supplied from the circuit board 470 . For example, when power is supplied to the first liquid crystal element 452 , incident light can be output as it is, and when power is not supplied to the first liquid crystal element 452 , the polarization direction of the incident light is rotated to can be printed out.

According to an embodiment, light passing through the first liquid crystal element 452 may be incident on the second birefringent plate 453 positioned adjacent to the first liquid crystal element 452 . In this case, similarly to the first birefringent plate 451 , the thickness t of the second birefringent plate 453 , the ordinary ray refractive index n _o , and/or the extraordinary ray refractive index ne _e is different from the ordinary ray. The separation width d of the light beam may be adjusted to be 1/2 the size of the pixel 411 . In the case of FIG. 8 , only two rays separated by the first birefringent plate 451 are illustrated for convenience, but the separated rays may be separated once more while passing through the second birefringent plate 453 .

According to an embodiment, light (eg, ordinary ray and extraordinary ray) passing through the second birefringent plate 453 may be incident on the second liquid crystal element 454 positioned adjacent to the second birefringent plate 453 . . In this case, like the first liquid crystal element 452 , the second liquid crystal element 454 may change the polarization state of the incident light according to the control signal supplied from the circuit board 470 . For example, the second liquid crystal element 454 may rotate the polarization direction of the incident light based on the control signal supplied from the circuit board 470 . For example, when power is supplied to the second liquid crystal element 454 , incident light can be output as it is, and when power is not supplied to the second liquid crystal element 454 , the polarization direction of the incident light is rotated can be printed out.

According to an embodiment, light passing through the second liquid crystal element 454 may be incident on the polarizing plate 455 positioned adjacent to the second liquid crystal element 454 . According to an embodiment, the polarizing plate 455 may output only a component of the incident light that is the same as the polarization direction of the polarizing plate 455 . Accordingly, the final output may be determined by the polarizing plate 455 .

9A and 9B illustrate a first birefringent plate 451 , a first liquid crystal element 452 , and a second birefringent plate 453 according to a control signal from the circuit board 470 in the transparent cover 450 according to an embodiment. ) is a diagram showing the light passing through it.

FIG. 9A illustrates a case in which power is supplied to the first liquid crystal element 452 , and FIG. 9B illustrates a case in which power is not supplied to the first liquid crystal element 452 .

According to an embodiment, the first birefringent plate 451 and the second birefringent plate 453 may use birefringent plates having different directions (eg, perpendicular to each other) for separating incident light. Depending on the angle θ of the cutting surface of the birefringent plate, the direction of separating (or refracting) the incident light may be different. According to an embodiment, the first birefringent plate 451 may be a birefringent plate having a cutting plane angle of about 0 degrees, and the second birefringent plate 453 may be a birefringent plate having a cutting plane angle of about 90 degrees. In this case, the light passing through the first birefringent plate 451 may be separated (or refracted) in the horizontal direction and output, and the light passing through the second birefringent plate 453 may be separated (or refracted) in the vertical direction. can be output. According to another embodiment, the first birefringent plate 451 may be a birefringent plate having a cutting plane angle of about 90 degrees, and the second birefringent plate 453 may be a birefringent plate having a cutting plane angle of about 0 degrees.

According to an embodiment, the first liquid crystal element 452 may output incident light as it is according to a control signal or may operate as a quarter-wave plate and change it into rotated circularly polarized light to output it. For example, the first liquid crystal element 452 may determine whether to rotate the output light by 1/4 wavelength based on the control signal. According to an embodiment, when power is not supplied to the first liquid crystal element 452 , the first liquid crystal element 452 may serve as a quarter wave plate (refer to (b) of FIG. 9B ). When power is supplied to the first liquid crystal element 452, the first liquid crystal element 452 can output the light without changing the polarization direction, and when power is not supplied to the first liquid crystal element 452, the first liquid crystal element 452 One liquid crystal element 452 may output circularly polarized light by rotating the polarization direction of light by 1/4 wavelength.

Hereinafter, the first birefringent plate 451 uses a birefringent plate having a cutting plane angle of about 0 degrees, and the second birefringent plate 453 uses a birefringent plate having a cutting plane angle of about 90 degrees, and the first liquid crystal The element 452 will be described with respect to a case serving as a quarter wave plate.

Referring to FIGS. 9A and 9B , when unpolarized light is incident on the first birefringent plate 451 (a birefringent plate having a cutting plane angle of 0 degrees), the unpolarized light is an ordinary ray An ordinary ray that is not refracted according to the refractive index n _o and an extraordinary ray that is output according to the refractive index _ne may be divided into an extraordinary ray refracted in the horizontal direction. In this case, the ordinary ray may be perpendicular to the optical axis and the extraordinary ray may be parallel to the optical axis, and the ordinary ray and the extraordinary ray may be light polarized in different directions, that is, light polarized in directions perpendicular to each other.

9a (b) and 9b (c), when unpolarized light is incident on the second birefringent plate 453 (ie, a birefringent plate having a cutting plane angle of 90 degrees), the unpolarized light is It may be divided into an unrefracted ordinary ray output according to the ordinary ray refractive index n _o and an extraordinary ray refracted in a vertical direction output according to the extraordinary ray refractive index _ne . In this case, the ordinary ray may be perpendicular to the optical axis and the extraordinary ray may be parallel to the optical axis, and the ordinary ray and the extraordinary ray may be light polarized in different directions, that is, light polarized in directions perpendicular to each other.

According to an embodiment, the polarized direction of the normal ray output when the unpolarized light is incident on the first birefringent plate 451 and the normal ray output when the unpolarized light is incident on the second birefringent plate 453 . may be perpendicular to each other. Polarized directions of the abnormal ray output when the unpolarized light is incident on the first birefringent plate 451 and the abnormal ray output when the unpolarized light is incident on the second birefringent plate 453 may be perpendicular to each other.

Referring to (c) of FIG. 9A , when the unpolarized light is incident on the first birefringent plate 451 , it may be separated into an ordinary ray having a vertical component polarized light and an extraordinary ray having a horizontal component polarized light. The ordinary ray and the extraordinary ray may be incident on the first liquid crystal element 452 . In the case of FIG. 9A , power may be supplied to the first liquid crystal element 452 by the control signal supplied from the circuit board 470 . According to an embodiment, the light incident on the first liquid crystal element 452 to which power is supplied may be output without changing the polarization direction.

The vertically polarized light (normal ray) and horizontal polarized light (normal ray) passing through the first liquid crystal element 452 may be incident on the second birefringent plate 453 . When the vertically polarized light passes through the second birefringent plate 453 , it may be refracted by the second birefringent plate 453 and output as an abnormal ray. For example, since there is no horizontal component in the polarized light of the vertical component incident on the second birefringent plate 453 , the horizontally polarized light output without being refracted from the second birefringent plate 453 (eg, image rays) may not exist. When polarized light of a horizontal component passes through the second birefringent plate 453 , it is not refracted by the second birefringent plate 453 and may be output as normal rays as it is. For example, since there is no vertical component in the horizontal component polarized light incident on the second birefringent plate 453 , the vertically polarized light (eg, abnormal ray) refracted by the second birefringent plate 453 is output. ) may not exist.

Referring to (d) of FIG. 9B , when unpolarized light is incident on the first birefringent plate 451 , it may be separated into an ordinary ray having a vertical component polarized light and an extraordinary ray having a horizontal component polarized light. The ordinary ray and the extraordinary ray may be incident on the first liquid crystal element 452 . In the case of FIG. 9B , power may not be supplied to the first liquid crystal element 452 by the control signal supplied from the circuit board 470 . According to an embodiment, the polarization direction of the light incident to the first liquid crystal element 452 to which power is not supplied may be rotated by 1/4 wavelength to be output as circularly polarized light. According to an exemplary embodiment, circularly polarized light (normal ray) output while vertically polarized light (normal ray) passes through the first liquid crystal element 452 and horizontally polarized light (normal ray) are output by the first liquid crystal element 452 . The circularly polarized light output while passing through may be circularly polarized light having different phases from each other.

According to an embodiment, the two circularly polarized lights passing through the first liquid crystal element 452 may be incident on the second birefringent plate 453 . According to an embodiment, depending on the phase at which the circularly polarized light is incident on the second birefringent plate 453 , the circularly polarized light may be separated into vertical component polarized light and horizontal component polarized light and output. there is. For example, the circularly polarized light may include unrefracted horizontally polarized light (eg, normal ray) and a refracted vertical direction according to the phase at which the circularly polarized light is incident on the second birefringent plate 453 . of polarized light (eg, extraordinary rays) can be separated and output.

10 is a table illustrating light output according to a control signal of the circuit board 470 from the transparent cover 450 according to an exemplary embodiment.

The output A of FIG. 10 may correspond to the output described with reference to FIGS. 9A and 9B . For example, the output 1001 of FIG. 10 may correspond to the output 910b of FIG. 9B , and the output 1002 of FIG. 10 may correspond to the output 910a of FIG. 9A . In the case of the output 1001 , the non-output light 1001a and the output light 1001b may be configured by adjusting the phase at which the circularly polarized light is incident on the second birefringent plate 453 . In the case of the output 1002, as described above with reference to FIG. 9A, it may be composed of a non-output light 1002a and an output light 1002b.

According to an embodiment, the outputs A ( 1001 , 1002 ) may be incident on the second liquid crystal element 454 , and the second liquid crystal element 454 outputs the incident light as it is or rotates about 90 degrees according to the control signal. can be printed out. For example, the second liquid crystal element 454 may determine whether to rotate the output light by about 90 degrees based on the control signal. According to an embodiment, when power is not supplied to the second liquid crystal element 454 , the second liquid crystal element 454 may serve as a 1/2 wave plate. When power is supplied to the second liquid crystal element 454, the second liquid crystal element 454 can output the light as it is without changing the polarization direction, and when power is not supplied to the second liquid crystal element 454, the second liquid crystal element 454 can output the light. 2 The liquid crystal element 454 may output the light by rotating the polarization direction by about 90 degrees.

Referring to division (1) of FIG. 10 , the output 1001 (or the light constituting the output 1001) may be incident on the second liquid crystal element 454 to which power is supplied, and while passing through the second liquid crystal element 454 , It can be output as it is (output 1003) without being rotated. The output 1003 may be incident on the polarizing plate 455 in the horizontal direction, and only light corresponding to the polarization direction or the same as the polarization direction of the polarizing plate 455 among a plurality of lights constituting the output 1003 while passing through the polarizing plate 455 is output ( output 1007).

Referring to division (2) of FIG. 10 , the output 1001 (or the light constituting the output 1001) may be incident on the second liquid crystal element 454 to which power is not supplied, and pass through the second liquid crystal element 454 . It can be rotated about 90 degrees while being output (output 1004). The output 1004 may be incident on the polarizing plate 455 in the horizontal direction, and only light corresponding to the polarization direction or the same as the polarization direction of the polarizing plate 455 among a plurality of lights constituting the output 1004 while passing through the polarizing plate 455 is output ( output 1008).

Referring to division (3) of FIG. 10 , the output 1002 (or the light constituting the output 1002) may be incident on the second liquid crystal element 454 to which power is supplied, and while passing through the second liquid crystal element 454 , It can be output as it is (output 1005) without being rotated. The output 1005 may be incident on the polarizing plate 455 in the horizontal direction, and only light corresponding to the polarization direction or the same as the polarization direction of the polarizing plate 455 among a plurality of lights constituting the output 1005 while passing through the polarizing plate 455 is output ( output 1009).

Referring to division (4) of FIG. 10 , the output 1002 (or light constituting the output 1002) may be incident on the second liquid crystal element 454 to which power is not supplied, and pass through the second liquid crystal element 454 . While being rotated about 90 degrees can be output (output 1006). The output 1006 may be incident on the polarizing plate 455 in the horizontal direction, and only light corresponding to the polarization direction or the same as the polarization direction of the polarizing plate 455 among a plurality of lights constituting the output 1006 while passing through the polarizing plate 455 is output ( output 1010).

According to an embodiment, the output 1007 of the division (1) of FIG. 10 is an output in which the light output from the micro LED array 410 itself is not moved, and the output 1008 of the division (2) of FIG. 10 is the micro LED array ( The light output from 410 is an output that is vertically and horizontally shifted by 1/2 the size of the pixel 411, and the output 1009 of division (3) of FIG. 10 is the light output from the micro LED array 410 It is an output that is horizontally shifted by 1/2 of the size of the pixel 411, and the output 1010 of division (4) of FIG. 10 indicates that the light output from the micro LED array 410 is 1/2 of the size of the pixel 411 It may be a vertically shifted output.

11 is a diagram illustrating a configuration of outputting an image passing through the transparent cover 450 according to an exemplary embodiment.

Referring to FIG. 11 , frames 1110 , 1120 , and 1130 of an original image may be output at a rate of 60 Hz, and the original image may be output according to a control signal supplied to the first liquid crystal element 452 and the second liquid crystal element 454 .

Frames

1111 , 1112 , 1113 , 1121 , 1122 , 1123 , 1131 , 1132 , and 1133 in which the image frame is horizontally and/or vertically moved may be output at a speed of 240 Hz.

According to an embodiment, the

frames

1110 , 1120 , and 1130 of the original image may correspond to division 1 (or output 1007 ) of FIG. 10 , and the frame of the original image is 1/2 of the size of the pixel 411 .

Frames

1111, 1121, and 1131 moved vertically and horizontally by as much as possible may correspond to division (2) (or output 1008) of FIG. 10, and the frame of the original image is horizontally moved by 1/2 the size of the pixel 411 The

frames

1112, 1122, and 1132 may correspond to division (3) (or output 1009) of FIG. 10, and the frame 1113, in which the frame of the original image is vertically moved by 1/2 the size of the

pixel

411, 1123 and 1133 may correspond to division (4) (or output 1010) of FIG. 10 .

According to an embodiment, even if the frame of the original image is output at a speed of 60 Hz, since the frame moved while passing through the transparent cover 450 of the optical engine 400 is additionally output at a speed of 240 Hz, the optical engine 400 is a micro An image having a resolution 4 times higher than the resolution of the LED array 410 can be output. According to an embodiment, the frame in which the light output from the micro LED array 410 is not moved, the light output from the micro LED array 410 is vertically and horizontally shifted by 1/2 the size of the pixel 411 . A frame in which the light output from the micro LED array 410 is horizontally shifted by 1/2 of the size of the pixel 411, and the light output from the micro LED array 410 is the size of the pixel 411 Frames vertically shifted by 1/2 are output in synchronization with each other, and virtual pixels can be configured by the interpolation principle. can be printed out.

According to another embodiment, the transparent cover 450 of the optical engine 400 may include only one birefringent plate (eg, the first birefringent plate 451 ). In this case, the light passing through the transparent cover 450 is the

frames

1110 , 1120 , 1130 of the original image and frames 1112 , 1122 , 1132 in which the frames of the original image are horizontally moved by 1/2 the size of the pixel 411 . may include According to an embodiment, even if the frame of the original image is output at a speed of 60 Hz, the frame moved while passing through the transparent cover 450 of the optical engine 400 is additionally output at a speed of 120 Hz, so the optical engine 400 is a micro It is possible to output an image twice as high as the resolution of the LED array 410 itself. According to an embodiment, the frame in which the light output from the micro LED array 410 is not moved, and the light output from the micro LED array 410 is horizontally shifted by 1/2 the size of the pixel 411 . Frames are output in synchronization with each other to configure virtual pixels by the interpolation principle, and through this, an image having a higher resolution than that of the micro LED array 410 can be output.

12A is a diagram illustrating an optical engine 400 disposed in the wearable electronic device 100 according to an embodiment, and FIG. 12B is an optical engine 400 of the wearable electronic device 100 according to an embodiment. A diagram showing the light output.

12A and 12B , the optical engine 400 described above with reference to FIGS. 4 to 11 is disposed in the wearable electronic device 100 and transmits light to the first glass 201 and/or the second glass 202 . can be printed out. For example, the light emitted from the micro LED array 410 passes through the micro lens array 430 and the transparent cover 450, and is separated into a plurality of lights parallel to each other and having different polarization characteristics to be output. The plurality of separated lights may be incident on the first glass 201 and/or the second glass 202 through a projection lens 470 . A user wearing the wearable electronic device 100 may view an image having a higher resolution than that of the micro LED array 410 itself by the plurality of separated lights output from the optical engine 400 .

13 is a block diagram of an electronic device 1301 (eg, the wearable electronic device 100 of FIG. 1 ) in a network environment 1300 according to various embodiments of the present disclosure.

Referring to FIG. 13 , in a network environment 1300 , the electronic device 1301 communicates with the electronic device 1302 through a first network 1398 (eg, a short-range wireless communication network) or a second network 1399 . It may communicate with the electronic device 1304 or the server 1308 through (eg, a long-distance wireless communication network). According to an embodiment, the electronic device 1301 may communicate with the electronic device 1304 through the server 1308 . According to an embodiment, the electronic device 1301 includes a processor 1320 (eg, the processor 300 of FIG. 3 ), a memory 1330 , an input module 1350 , a sound output module 1355 , and a display module 1360 . ), audio module 1370 (eg, audio module 320 of FIG. 3 ), sensor module 1376 (eg, sensor module 310 of FIG. 3 ), interface 1377 , connection terminal 1378 , haptic Module 1379 , camera module 1380 (eg, camera module 340 in FIG. 3 ), power management module 1388 , battery 1389 (eg, battery 330 in FIG. 3 ), communication module 1390 . ) (eg, the communication interface 350 of FIG. 3 ), a subscriber identification module 1396 , or an antenna module 1397 . In some embodiments, at least one of these components (eg, the connection terminal 1378 ) may be omitted or one or more other components may be added to the electronic device 1301 . In some embodiments, some of these components (eg, sensor module 1376 , camera module 1380 , or antenna module 1397 ) are integrated into one component (eg, display module 1360 ). can be

The processor 1320, for example, executes software (eg, a program 1340) to execute at least one other component (eg, a hardware or software component) of the electronic device 1301 connected to the processor 1320 . It can control and perform various data processing or operations. According to one embodiment, as at least part of data processing or computation, the processor 1320 converts commands or data received from other components (eg, the sensor module 1376 or the communication module 1390) to the volatile memory 1332 . , process the command or data stored in the volatile memory 1332 , and store the result data in the non-volatile memory 1334 . According to an embodiment, the processor 1320 is the main processor 1321 (eg, a central processing unit or an application processor) or a secondary processor 1323 (eg, a graphic processing unit, a neural network processing unit) a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor). For example, when the electronic device 1301 includes a main processor 1321 and a sub-processor 1323 , the sub-processor 1323 uses less power than the main processor 1321 or is set to be specialized for a specified function. can The coprocessor 1323 may be implemented separately from or as part of the main processor 1321 .

The co-processor 1323 may be, for example, on behalf of the main processor 1321 while the main processor 1321 is in an inactive (eg, sleep) state, or when the main processor 1321 is active (eg, executing an application). ), together with the main processor 1321, at least one of the components of the electronic device 1301 (eg, the display module 1360, the sensor module 1376, or the communication module 1390) It is possible to control at least some of the related functions or states. According to one embodiment, the coprocessor 1323 (eg, image signal processor or communication processor) may be implemented as part of another functionally related component (eg, camera module 1380 or communication module 1390). there is. According to an embodiment, the auxiliary processor 1323 (eg, a neural network processing device) may include a hardware structure specialized for processing an artificial intelligence model. Artificial intelligence models can be created through machine learning. Such learning may be performed, for example, in the electronic device 1301 itself on which artificial intelligence is performed, or may be performed through a separate server (eg, the server 1308). The learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but in the above example not limited The artificial intelligence model may include a plurality of artificial neural network layers. Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the above example. The artificial intelligence model may include, in addition to, or alternatively, a software structure in addition to the hardware structure.

The memory 1330 may store various data used by at least one component of the electronic device 1301 (eg, the processor 1320 or the sensor module 1376 ). The data may include, for example, input data or output data for software (eg, the program 1340 ) and instructions related thereto. The memory 1330 may include a volatile memory 1332 or a non-volatile memory 1334 .

The program 1340 may be stored as software in the memory 1330 , and may include, for example, an operating system 1342 , middleware 1344 , or an application 1346 .

The input module 1350 may receive a command or data to be used in a component (eg, the processor 1320 ) of the electronic device 1301 from the outside (eg, a user) of the electronic device 1301 . The input module 1350 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).

The sound output module 1355 may output a sound signal to the outside of the electronic device 1301 . The sound output module 1355 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback. The receiver may be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from or as part of the speaker.

The display module 1360 may visually provide information to the outside (eg, a user) of the electronic device 1301 . The display module 1360 may include, for example, a control circuit for controlling a display, a hologram device, or a projector and a corresponding device. According to an embodiment, the display module 1360 may include a touch sensor configured to sense a touch or a pressure sensor configured to measure the intensity of a force generated by the touch.

The audio module 1370 may convert a sound into an electric signal or, conversely, convert an electric signal into a sound. According to an embodiment, the audio module 1370 acquires a sound through the input module 1350 or an external electronic device (eg, a sound output module 1355 ) directly or wirelessly connected to the electronic device 1301 . The electronic device 1302) (eg, a speaker or headphones) may output sound.

The sensor module 1376 detects an operating state (eg, power or temperature) of the electronic device 1301 or an external environmental state (eg, a user state), and generates an electrical signal or data value corresponding to the sensed state. can do. According to one embodiment, the sensor module 1376 may include, for example, a gesture sensor, a gyro sensor, a barometric sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.

The interface 1377 may support one or more specified protocols that may be used for the electronic device 1301 to directly or wirelessly connect with an external electronic device (eg, the electronic device 1302 ). According to an embodiment, the interface 1377 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal 1378 may include a connector through which the electronic device 1301 can be physically connected to an external electronic device (eg, the electronic device 1302 ). According to an embodiment, the connection terminal 1378 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 1379 may convert an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that the user can recognize through tactile or kinesthetic sense. According to an embodiment, the haptic module 1379 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 1380 may capture still images and moving images. According to an embodiment, the camera module 1380 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 1388 may manage power supplied to the electronic device 1301 . According to an embodiment, the power management module 1388 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

The battery 1389 may supply power to at least one component of the electronic device 1301 . According to one embodiment, battery 1389 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

The communication module 1390 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 1301 and an external electronic device (eg, the electronic device 1302 , the electronic device 1304 , or the server 1308 ). It can support establishment and communication performance through the established communication channel. The communication module 1390 may include one or more communication processors that operate independently of the processor 1320 (eg, an application processor) and support direct (eg, wired) communication or wireless communication. According to one embodiment, the communication module 1390 is a wireless communication module 1392 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 1394 (eg, : It may include a LAN (local area network) communication module, or a power line communication module). A corresponding communication module among these communication modules is a first network 1398 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 1399 (eg, legacy). It may communicate with the external electronic device 1304 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (eg, a telecommunication network such as a LAN or WAN). These various types of communication modules may be integrated into one component (eg, a single chip) or may be implemented as a plurality of components (eg, multiple chips) separate from each other. The wireless communication module 1392 uses subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 1396 within a communication network, such as the first network 1398 or the second network 1399 . The electronic device 1301 may be identified or authenticated.

The wireless communication module 1392 may support a 5G network after a 4G network and a next-generation communication technology, for example, a new radio access technology (NR). NR access technology includes high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and access to multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency) -latency communications)). The wireless communication module 1392 may support a high frequency band (eg, mmWave band) to achieve a high data rate, for example. The wireless communication module 1392 uses various technologies for securing performance in a high-frequency band, for example, beamforming, massive multiple-input and multiple-output (MIMO), all-dimensional multiplexing. It may support technologies such as full dimensional MIMO (FD-MIMO), an array antenna, analog beam-forming, or a large scale antenna. The wireless communication module 1392 may support various requirements specified in the electronic device 1301 , an external electronic device (eg, the electronic device 1304 ), or a network system (eg, the second network 1399 ). According to an embodiment, the wireless communication module 1392 includes a peak data rate (eg, 20 Gbps or more) for realizing eMBB, loss coverage (eg, 164 dB or less) for realizing mMTC, or U-plane latency for realizing URLLC ( Example: downlink (DL) and uplink (UL) each 0.5 ms or less, or round trip 1 ms or less).

The antenna module 1397 may transmit or receive a signal or power to the outside (eg, an external electronic device). According to an embodiment, the antenna module 1397 may include an antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed of a conductive pattern. According to an embodiment, the antenna module 1397 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for a communication scheme used in a communication network such as the first network 1398 or the second network 1399 is connected from the plurality of antennas by, for example, the communication module 1390 . can be selected. A signal or power may be transmitted or received between the communication module 1390 and an external electronic device through the selected at least one antenna. According to some embodiments, other components (eg, a radio frequency integrated circuit (RFIC)) other than the radiator may be additionally formed as a part of the antenna module 1397 .

According to various embodiments, the antenna module 1397 may form a mmWave antenna module. According to one embodiment, the mmWave antenna module comprises a printed circuit board, an RFIC disposed on or adjacent to a first side (eg, bottom side) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, an array antenna) disposed on or adjacent to a second side (eg, top or side) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.

At least some of the components are connected to each other through a communication method between peripheral devices (eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and a signal ( eg commands or data) can be exchanged with each other.

According to an embodiment, the command or data may be transmitted or received between the electronic device 1301 and the external electronic device 1304 through the server 1308 connected to the second network 1399 . Each of the external

electronic devices

1302 and 1304 may be the same or a different type of the electronic device 1301 . According to an embodiment, all or a part of operations executed by the electronic device 1301 may be executed by one or more external

electronic devices

1302 , 1304 , or 1308 . For example, when the electronic device 1301 needs to perform a function or service automatically or in response to a request from a user or other device, the electronic device 1301 may instead of executing the function or service itself. Alternatively or additionally, one or more external electronic devices may be requested to perform at least a part of the function or the service. One or more external electronic devices receiving the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit a result of the execution to the electronic device 1301 . The electronic device 1301 may process the result as it is or additionally and provide it as at least a part of a response to the request. For this, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device 1301 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device 1304 may include an Internet of things (IoT) device. The server 1308 may be an intelligent server using machine learning and/or neural networks. According to an embodiment, the external electronic device 1304 or the server 1308 may be included in the second network 1399 . The electronic device 1301 may be applied to an intelligent service (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.

As described above, the optical engine (eg, the optical engine 400 of FIG. 3 ) of the wearable electronic device (eg, the wearable electronic device 100 of FIG. 3 ) according to an embodiment includes a micro LED array, the micro LED array is composed of a plurality of pixels; a transparent cover disposed above the micro LED array and passing light output from the micro LED array; and a circuit board disposed under the micro LED array and supplying driving power and control signals to at least one of the micro LED array and the transparent cover, wherein the transparent cover includes: a first birefringent plate; a first liquid crystal element disposed on the first birefringent plate; a second birefringent plate disposed on the first liquid crystal element; a second liquid crystal element disposed on the second birefringent plate; and a polarizing plate disposed on the second liquid crystal element.

According to an embodiment, the optical engine of the wearable electronic device may further include a micro lens array disposed between the micro LED array and the transparent cover, wherein the micro lens array includes light incident from the micro LED array. You can adjust the orientation angle of

According to an embodiment, the center of each micro lens included in the micro lens array may be arranged to be aligned with the center of each pixel included in the micro LED array.

According to an embodiment, the transparent cover may output the light output from the micro LED array by vertically or horizontally shifting it.

According to an embodiment, the optical engine may include: the light passing through the transparent cover includes: a first output in which the light output from the micro LED array is not moved; a second output in which the light output from the micro LED array is vertically shifted by 1/2 of the pixel size; a third output in which the light output from the micro LED array is horizontally shifted by 1/2 of the pixel size; and the light output from the micro LED array may be controlled to include at least one of a fourth output vertically and horizontally shifted by 1/2 of the pixel size.

According to an embodiment, the first output, the second output, the third output, and the fourth output may be determined by the control signal supplied to the transparent cover.

According to an embodiment, the circuit board may supply a driving power and a control signal to at least one of the first liquid crystal element and the second liquid crystal element.

According to an embodiment, the thickness and refractive index of each of the first birefringent plate and the second birefringent plate may be determined such that the ray separation width of the ordinary ray and the extraordinary ray passing through the birefringent plate is the pixel size. It may be configured to be 1/2.

According to an embodiment, a separation angle between the output ordinary ray and the extraordinary ray may be determined based on the angles of the cutting surfaces of the first birefringent plate and the second birefringent plate.

According to an embodiment, the first liquid crystal element and the second liquid crystal element may change the polarization state of the passing light based on the control signal of the circuit board.

As described above, in the wearable electronic device (eg, the wearable electronic device 100 of FIG. 3 ) according to an embodiment, a housing (eg, the connection member ( 210), the first member 211 of FIG. 2, the second member 221 of FIG. 2, the third member 212 of FIG. 2, and the fourth member 222 of FIG. 2); An optical engine (eg, the optical engine 400 of FIG. 3 ) that emits light for outputting an image; and a transparent glass (eg, a waveguide) that guides the light emitted from the optical engine a first glass 201 of FIG. 2 and a second glass 202 of FIG. 2 ), wherein the optical engine includes: a micro LED array, the micro LED array comprising a plurality of pixels; a transparent cover disposed above the micro LED array and passing light output from the micro LED array; a circuit board for supplying a control signal, wherein the transparent cover includes: a first liquid crystal element disposed on the first birefringent plate, and a second birefringence element disposed on the first liquid crystal element a second liquid crystal element disposed on the second birefringent plate, and a polarizing plate disposed on the second liquid crystal element.

According to an embodiment, the optical engine may further include a micro-lens array disposed between the micro-LED array and the transparent cover, wherein the micro-lens array adjusts the beam angle of the light incident from the micro-LED array. can be adjusted

Claims

In an optical engine of a wearable electronic device,

a micro LED array, wherein the micro LED array consists of a plurality of pixels;

a transparent cover disposed above the micro LED array and passing light output from the micro LED array; and

and a circuit board disposed under the micro LED array and supplying driving power and control signals to at least one of the micro LED array and the transparent cover,

The transparent cover comprises:

a first birefringent plate;

a first liquid crystal element disposed on the first birefringent plate;

a second birefringent plate disposed on the first liquid crystal element;

a second liquid crystal element disposed on the second birefringent plate; and

An optical engine of a wearable electronic device comprising a polarizing plate disposed on the second liquid crystal element.
The method according to claim 1,

Further comprising a micro lens array disposed between the micro LED array and the transparent cover,

The micro-lens array is an optical engine of a wearable electronic device for adjusting a beam angle of light incident from the micro LED array.
3. The method according to claim 2,

The optical engine of the wearable electronic device, wherein the center of each micro lens included in the micro lens array is arranged to be aligned with the center of each pixel included in the micro LED array.
The method according to claim 1,

The transparent cover moves the light output from the micro LED array vertically or horizontally and outputs it, the optical engine of the wearable electronic device.
The method according to claim 1,

The optical engine, the light passing through the transparent cover:

a first output in which the light output from the micro LED array is not moved;

a second output in which the light output from the micro LED array is vertically shifted by 1/2 of the pixel size;

a third output in which the light output from the micro LED array is horizontally shifted by 1/2 of the pixel size; and

The optical engine of the wearable electronic device, controlling the light output from the micro LED array to include at least one of a fourth output vertically and horizontally moved by 1/2 of the pixel size.
6. The method of claim 5,

The optical engine of the wearable electronic device, wherein the first output, the second output, the third output, and the fourth output are determined by the control signal supplied to the transparent cover.
The method according to claim 1,

and the circuit board supplies driving power and a control signal to at least one of the first liquid crystal element and the second liquid crystal element.
The method according to claim 1,

The thickness and refractive index of each of the first birefringent plate and the second birefringent plate are configured so that the ray separation width of the ordinary ray and the extraordinary ray passing through the birefringent plate is 1/2 of the pixel size. , the optical engine of wearable electronics.
The method according to claim 1,

The optical engine of the wearable electronic device, wherein a separation angle between the output normal ray and the extraordinary ray is determined based on the angles of the cutting surfaces of the first birefringent plate and the second birefringent plate.
The method according to claim 1,

The optical engine of the wearable electronic device, wherein the first liquid crystal element and the second liquid crystal element change a polarization state of the passing light based on a control signal of the circuit board.
A wearable electronic device comprising:

a housing forming at least a portion of an exterior of the wearable electronic device;

an optical engine emitting light for outputting an image; and

a transparent glass comprising a waveguide for guiding the light emitted from the optical engine;

The optical engine is:

a micro LED array, wherein the micro LED array consists of a plurality of pixels;

a transparent cover disposed above the micro LED array and passing light output from the micro LED array; and

and a circuit board disposed under the micro LED array and supplying driving power and control signals to at least one of the micro LED array and the transparent cover,

The transparent cover comprises:

a first liquid crystal element disposed on the first birefringent plate;

a second birefringent plate disposed on the first liquid crystal element;

a second liquid crystal element disposed on the second birefringent plate; and

A wearable electronic device comprising a polarizing plate disposed on the second liquid crystal element.
12. The method of claim 11,

The optical engine further includes a micro lens array disposed between the micro LED array and the transparent cover,

The micro lens array adjusts the beam angle of the light incident from the micro LED array,

The wearable electronic device, wherein the center of each micro lens included in the micro lens array is arranged to be aligned with the center of each pixel included in the micro LED array.
12. The method of claim 11,

The optical engine, the light passing through the transparent cover:

a first output in which the light output from the micro LED array is not moved;

a second output in which the light output from the micro LED array is vertically shifted by 1/2 of the pixel size;

a third output in which the light output from the micro LED array is horizontally shifted by 1/2 of the pixel size; and

Controlling the light output from the micro LED array to include at least one output of a fourth output vertically and horizontally moved by 1/2 of the pixel size,

The first output, the second output, the third output, and the fourth output are determined by the control signal supplied to the transparent cover.
12. The method of claim 11,

The thickness and refractive index of each of the first birefringent plate and the second birefringent plate are configured such that the ray separation width of the ordinary ray and the extraordinary ray passing through the birefringent plate is 1/2 of the pixel size. , wearable electronic devices.
12. The method of claim 11,

and a separation angle between the output normal ray and the extraordinary ray is determined based on angles of the cutting surfaces of the first birefringent plate and the second birefringent plate.