Light guide device, projection device and electronic device comprising same

Abstract

An embodiment provides an electronic device comprising: a projector; a light guide device that guides light emitted from the projector; and an image rotation element provided between the projector and the light guide device, in which the image rotation element rotates light emitted from the projector about a longitudinal direction of the image rotation element. An embodiment provides a projection apparatus including: a light source unit disposed in a housing; a light modulator disposed at one surface of the housing; a lens unit disposed at a rear end of the light source unit; a reflection unit disposed between the light source unit and the light modulator; a projection lens unit; and a prism provided between the light modulator and the projection lens unit, in which the light source unit, the lens unit, and the reflection unit are sequentially provided and arranged to be inclined with respect to the light modulator or a top surface of the housing.

Description

Technical Field

[0001] The embodiments relate to light guide devices, projection devices, and electronic devices including them. Background Technology

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

[0003] Augmented reality (AR) is a technology that combines virtual objects or information with the real environment to make them look like objects that exist in the original environment.

[0004] Mixed reality (MR), or hybrid reality, refers to the merging of the virtual and real worlds to create new environments or information. Specifically, it is called mixed reality when things existing in the real world and things existing in the virtual world can interact in real time.

[0005] At this point, the created virtual environment and scenarios stimulate the user's five senses, making the spatial and temporal experience similar to that of the real world, thus allowing the user to freely traverse the boundary between reality and imagination. Furthermore, users can not only immerse themselves in this environment but also interact with elements implemented within it, such as using devices that exist in real space to add operations and provide commands.

[0006] Recently, research has been actively conducted on devices (including gears and mechanisms) used in these technological fields. However, a need is emerging for miniaturization of devices and improvements in optical performance. Summary of the Invention Technical issues

[0007] The embodiments provide a projection device and an electronic device, which, when used for augmented reality (AR) and the like, are miniaturized and compacted by adjusting the positions of the light source, reflector, lens, prism, light modulator and projection device.

[0008] Furthermore, the embodiments provide an electronic device that, when using a light guide device for augmented reality (AR) and the electronic device therein, enables the image to be provided to the user without loss of resolution, even when the size is reduced by using an image ratio where the vertical length is greater than the horizontal length.

[0009] Furthermore, embodiments may provide electronic devices that achieve overall miniaturization and provide a comfortable image ratio for the user by positioning projection devices and the like at the top and bottom of the frame.

[0010] Furthermore, embodiments may provide a projection device and electronic device, wherein the height of the projection device in the second direction is reduced by avoiding interference between components through an inclined structure formed between components such as a light source, a lens unit, and a single lens, thereby facilitating miniaturization.

[0011] Furthermore, embodiments may provide projection devices and electronic devices in which color separation caused by light sources emitting light of different wavelengths is minimized.

[0012] The embodiments may provide projection devices and electronic devices, wherein a tilt angle is set to improve manufacturability and maintain performance.

[0013] Furthermore, embodiments can provide projection devices and electronic devices with reduced volume by adjusting the positions of the lens unit and prism.

[0014] The objectives to be addressed by the embodiments are not limited to those described above, and will include objectives and effectiveness that can be identified through the objectives described below and the solutions of the embodiments. Technical solution

[0015] The projector according to an embodiment includes: a projector; a light guide configured to guide light emitted from the projector; and an image rotation element disposed between the projector and the light guide, wherein the image rotation element causes the light emitted from the projector to rotate about the longitudinal direction of the image rotation element.

[0016] The image rotation element can be configured to be adjacent to the projector and spaced a first distance from the projector.

[0017] The image rotation element can be configured to be spaced a second distance from the light guide device.

[0018] The direction of light emitted from the projector can be parallel to the longitudinal direction of the image rotation element.

[0019] When the angle between the length and height of the projector increases, the angle between the length and height of the image rotation element can also increase.

[0020] The angle formed between the height of the projector and the cross section perpendicular to the first axis can be different from the angle formed between the height of the image rotating element and the cross section perpendicular to the first axis.

[0021] When the angle between the height of the projector and the cross section perpendicular to the first axis is 0°, the angle between the height of the image rotation element and the cross section perpendicular to the first axis can be 45°.

[0022] The optical aperture of the projector and image rotation element can be located at the inner coupler of the light guide device.

[0023] The width of an image rotation element can be smaller than its length.

[0024] The projector, image rotation element, and light guide device can overlap each other in the longitudinal direction.

[0025] The electronic device may include a frame, on which a projector and an image rotating element are mounted.

[0026] The image rotation element may include a prism having a trapezoidal cross-section parallel to the longitudinal direction and a rectangular cross-section perpendicular to the longitudinal direction.

[0027] Projectors can have a length and height greater than their width.

[0028] The projection device according to an embodiment includes: a housing; a light source unit disposed inside the housing; a light modulator disposed on one surface of the housing; a lens unit disposed at the rear end of the light source unit; a reflection unit disposed between the light source unit and the light modulator; a projection lens unit; and a prism disposed between the light modulator and the projection lens unit, wherein the light source unit, the lens unit, and the reflection unit are arranged sequentially and are inclined relative to the top surface of the housing or the light modulator.

[0029] The light source unit may include a first light source and a second light source that emit light in different directions, and may include a first reflector configured to transmit light emitted from the first light source and a second reflector configured to reflect light emitted from the second light source.

[0030] The first and second reflectors can be tilted at different angles relative to the optical axis (OA) of the first light source.

[0031] The first mirror may have a tilt angle of 39° to 45° relative to the optical axis (OA), and the second mirror may have a tilt angle of 46.7° to 50.7°.

[0032] The first mirror may have a tilt angle of 46.7° to 50.7° relative to the top surface of the housing or the optical modulator, and the second mirror may have a tilt angle of 53.7° to 57.7° relative to the top surface of the housing or the optical modulator.

[0033] The lens unit may include: a first lens unit disposed at the rear end of the first light source; and a second lens unit disposed at the rear end of the second light source; and the lens unit may include: a third lens and a fourth lens disposed sequentially between the reflecting unit and the lens unit; and a fifth lens disposed between the reflecting unit and the prism.

[0034] The fifth lens may have a tilt angle of 1.8° to 5.8° relative to a cross section perpendicular to the top surface of the housing or optical modulator.

[0035] The reflective unit can have a tilt angle of 48° to 56° relative to a cross section perpendicular to the top surface of the housing or optical modulator.

[0036] The incident angle of the principal ray reflected by the reflecting unit and incident on the prism can be in the range of 3° to 4°.

[0037] The projection lens unit can be parallel or tilted relative to a cross section that is parallel to the top surface of the light modulator.

[0038] The projection lens unit can have a tilt angle of 5° to 10° relative to a cross section parallel to the top surface of the light modulator.

[0039] The projection lens unit may include a first projection lens to a fifth projection lens arranged sequentially along the optical axis (OA).

[0040] The emitting side surface of the fifth projection lens may have the largest radius of curvature among the emitting side surfaces of the first to fifth projection lenses.

[0041] The first projection lens can have the greatest thickness among the first to fifth projection lenses.

[0042] The first projection lens can have the largest effective diameter among the first to fifth projection lenses.

[0043] The second light source can emit light in different wavelengths.

[0044] The first reflector can be positioned between the second reflector and the first light source to reflect blue wavelength light, and the second reflector can be positioned between the first reflector and the second light source to reflect red wavelength light. Beneficial effects

[0045] When using light guide devices, projection devices, and electronic devices including them for augmented reality (AR) and the like, embodiments can achieve miniaturized and compact projection devices and electronic devices by adjusting the positions of the light source, reflector, lens, prism, light modulator, and projection device.

[0046] Furthermore, when using light guide devices for augmented reality (AR) and the electronic devices that include them, the embodiments enable the electronic devices to provide images to users without loss of resolution, even when the size is reduced by using an image ratio where the vertical length is greater than the horizontal length.

[0047] Furthermore, the embodiments can realize an electronic device that achieves overall miniaturization and provides a comfortable image ratio for the user by positioning the projection device and the like on the upper and lower parts of the frame.

[0048] Furthermore, the embodiments can realize projection devices and electronic devices, wherein interference between components is avoided by forming an inclined structure between components such as light sources, lens units and individual lenses, while reducing the height of the projection device in the second direction, thereby facilitating miniaturization.

[0049] Furthermore, the embodiments can realize projection devices and electronic devices in which color separation caused by light sources emitting light of different wavelengths is minimized.

[0050] The embodiments can realize projection devices and electronic devices, wherein manufacturability is improved and performance is maintained by setting a tilt angle.

[0051] Furthermore, the embodiments can achieve a projection device and electronic device with a reduced volume by adjusting the position of the lens unit and prism.

[0052] The various advantages and effects of the present invention are not limited to those described above, and can be more readily understood through the description of specific exemplary embodiments of the present invention. Attached Figure Description

[0053] Figure 1 This is a block diagram illustrating the configuration of an extended reality electronic device according to an embodiment of the present invention.

[0054] Figure 2 This is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

[0055] Figure 3 This is a perspective view of the projection device according to an embodiment.

[0056] Figure 4 This is another perspective view of the projection device according to an embodiment.

[0057] Figure 5 This is an exploded perspective view of the projection device according to an embodiment.

[0058] Figure 6 It is along Figure 3 The sectional view taken by line A-A' in the middle.

[0059] Figure 7 and Figure 8 This is a view of the projection device according to an embodiment, wherein the housing has been removed.

[0060] Figure 9 This is a perspective view of the housing of the projection device according to an embodiment.

[0061] Figure 10 It shows that other components are inserted. Figure 9 The view,

[0062] Figure 11This is a perspective view of the projection device according to an embodiment, wherein the tape has been removed.

[0063] Figure 12 This is a perspective view of the projection device according to an embodiment, wherein the tape is separated.

[0064] Figure 13a This is a cross-sectional view of the projection device according to an embodiment.

[0065] Figure 13b yes Figure 13a Another example,

[0066] Figure 14 This is an exploded perspective view of the light source unit in the projection device according to an embodiment.

[0067] Figure 15 This is a cross-sectional view of the projection device according to an embodiment.

[0068] Figure 16 yes Figure 15 An enlarged view of part K1 in the image.

[0069] Figure 17 This is a perspective view of the light source unit, first lens unit, second lens unit, first reflector, second reflector, and third lens of the projection device according to an embodiment.

[0070] Figure 18 This is a conceptual diagram of the first and second reflecting mirrors of the projection device according to an embodiment.

[0071] Figure 19 yes Figure 15 Enlarged view of part K2 in the image.

[0072] Figure 20 This is a view showing the light in the prism according to the driving state of the light modulator in the projection apparatus according to an embodiment.

[0073] Figure 21 yes Figure 15 An enlarged view of part K3 in the image.

[0074] Figure 22 This is a conceptual diagram of the third, fourth, and fifth lenses in the projection device according to an embodiment.

[0075] Figure 23 This is a perspective view of an electronic device according to an embodiment.

[0076] Figure 24 This is a plan view of an electronic device according to an embodiment.

[0077] Figure 25 This is a side view of the image rotation element, light guide device, and projection device in the electronic device according to an embodiment.

[0078] Figure 26 This is a plan view of the image rotation element and projection device in the electronic device according to the embodiment.

[0079] Figure 27 This is a front view of an image rotation element in an electronic device according to an embodiment.

[0080] Figure 28 yes Figure 25 and Figure 26 A schematic cross-sectional view of the projected light at position P1.

[0081] Figure 29 yes Figure 25 and Figure 26 A schematic cross-sectional view of the projected light at position P2 in the diagram.

[0082] Figure 30 yes Figure 25 and Figure 26 Another schematic cross-sectional view of the projected light at position P2. Detailed Implementation

[0083] In the following, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0084] However, the spirit of the invention is not limited to the embodiments described, and can be implemented in various forms. One or more elements in the embodiments can be selectively combined and replaced within the scope of the spirit of the invention for use.

[0085] Furthermore, unless specifically defined and described, the terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted in the sense that are commonly understood by those skilled in the art, and commonly used terms (such as terms defined in dictionaries) can be understood taking into account their contextual meaning in the relevant field.

[0086] Furthermore, the terminology used in the embodiments of the present invention is provided only for describing the embodiments of the present invention and not for limiting purposes.

[0087] In this specification, unless the context clearly indicates otherwise, the singular form includes its plural form, and in the case of describing “at least one (or one or more) of A, B and C”, this may include at least one of all combinations that can be combined with A, B and C.

[0088] Furthermore, terms such as first, second, A, B, (a), (b), etc., can be used to describe components of embodiments of the present invention.

[0089] These terms are used only to distinguish components from other components, and the nature, order, sequence, etc. of components are not limited by these terms.

[0090] Furthermore, when a component is described as “connected,” “coupled,” or “linked” to another component, the component can not only be directly connected, coupled, or linked to the other component, but also be connected, coupled, or linked to another element through other components between the component and the other component.

[0091] Furthermore, when a component is described as being formed "above" or "below" another component, the terms "above" or "below" include cases where the two components are in direct contact and cases where one or more components are (indirectly) positioned between the two components. Additionally, when a component is described as being positioned "above or below" another component, such a description can include cases where the component is positioned on the upper or lower side relative to the other component.

[0092] Figure 1 This is a block diagram illustrating the configuration of an extended reality electronic device according to an embodiment of the present invention.

[0093] refer to Figure 1 The extended reality electronic device 20 may include a wireless communication unit 21, an input unit 22, a sensing unit 23, an output unit 24, an interface unit 25, a memory 26, a control unit 27, a power supply unit 28, etc. It should be understood that the electronic device 20 is not required to implement… Figure 1 All the components shown, the electronic device 20 described in this specification, may alternatively be implemented by more or fewer components.

[0094] More specifically, in the aforementioned components, the wireless communication unit 21 may include one or more modules that enable wireless communication between the electronic device 20 and a wireless communication system, between the electronic device 20 and another electronic device, or between the electronic device 20 and an external server. Furthermore, the wireless communication unit 21 may include one or more modules that connect the electronic device 20 to one or more networks.

[0095] The wireless communication unit 21 may include at least one of a broadcast receiving module, a mobile communication module, a wireless Internet module, a short-range communication module, and a location information module.

[0096] Input unit 22 may include a camera or image input unit for receiving image signals, a microphone or audio input unit for receiving audio signals, or a user input unit (e.g., touch keys, buttons (mechanical keys), etc.) for receiving information from the user. Audio or image data collected from input unit 22 can be analyzed and processed via user control commands.

[0097] The sensing unit 23 may include one or more sensors for sensing at least one of the following: internal information of the electronic device 20, information about the surrounding environment of the electronic device 20, and user information.

[0098] For example, sensing unit 23 may include at least one of a proximity sensor, illuminance sensor, touch sensor, accelerometer, magnetic sensor, G-sensor, gyroscope sensor, motion sensor, RGB sensor, infrared (IR) sensor, finger scanning sensor, ultrasonic sensor, optical sensor (e.g., capture device), microphone, battery gauge, environmental sensor (e.g., barometer, hygrometer, thermometer, radiation detection sensor, thermal sensor, gas sensor, etc.), and chemical sensor (e.g., electronic nose, medical sensor, biosensor, etc.). Meanwhile, the electronic device 20 described herein may utilize a combination of information sensed from at least two or more of these sensors.

[0099] Output unit 24 can be configured to output various types of information related to vision, hearing, or touch, and may include at least one of a display unit, an audio output unit, a haptic module, or an optical output unit. The display unit may have an interlayer structure or a structure integrated with a touch sensor to realize a touchscreen. The touchscreen can provide an output interface between the augmented reality electronics 20 and the user, and also serve as a user input unit providing an input interface between the augmented reality electronics 20 and the user.

[0100] The interface unit 25 serves as an interface with various types of external devices connected to the electronic device 20. Through the interface unit 25, the electronic device 20 can receive virtual reality or augmented reality content from external devices and perform mutual interaction by exchanging various input signals, sensing signals, and data.

[0101] For example, interface unit 25 may include at least one of a wired / wireless headphone port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device with an identification module, an audio input / output (I / O) port, a video input / output (I / O) port, and a headphone port.

[0102] In addition, memory 26 stores data supporting various functions of electronic device 20. Memory 26 may store multiple applications or programs running on electronic device 20, as well as data or instructions for the operation of electronic device 20. At least some of these applications can be downloaded from an external server via wireless communication. Furthermore, at least some of these applications may be present on electronic device 20 at the time of manufacture for the basic functions of electronic device 20 (e.g., answering calls, making calls, receiving messages, and sending messages).

[0103] In addition to operations related to the application, the control unit 27 typically controls the overall operation of the electronic device 20. The control unit 27 can process signals, data, information, etc., input or output from the aforementioned components.

[0104] Furthermore, the control unit 27 can execute applications stored in the memory 26 to control at least some components and provide appropriate information or processing functions to the user. Additionally, the control unit 27 can operate by combining at least two or more components included in the electronic device 20 to execute applications.

[0105] Furthermore, the control unit 27 can use a gyroscope sensor, gravity sensor, motion sensor, etc., included in the sensing unit 23 to detect movement of the electronic device 20 or the user. Alternatively, the control unit 27 can use sensors such as proximity sensors, light sensors, magnetic sensors, infrared sensors, ultrasonic sensors, or optical sensors included in the sensing unit 23 to detect objects approaching the electronic device 20 or the user. Additionally, the control unit 27 can also detect user movement via sensors provided in a controller that operates in conjunction with the electronic device 20.

[0106] In addition, the control unit 27 can use the application stored in the memory 26 to perform the operation (or function) of the electronic device 20.

[0107] The power supply unit 28 receives external and internal power and supplies power to corresponding components included in the electronic device 20 under the control of the control unit 27. The power supply unit 28 includes a battery, which may be provided in a built-in or replaceable form.

[0108] According to the various embodiments described below, at least some of the corresponding components can cooperate with each other to implement the operation, control, or control method of the electronic device. Furthermore, the operation, control, or control method of the electronic device can be implemented on the electronic device by executing at least one application program stored in memory 26.

[0109] In the following description, the electronic device described as an example of the present invention will be based on an embodiment applied to a head-mounted display (HMD). However, embodiments of the electronic device according to the present invention may also include devices such as mobile phones, smartphones, laptop computers, terminals for digital broadcasting, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, tablet PCs, tablet PCs, ultrabooks, and wearable devices. In addition to HMDs, wearable devices may also include watch-type terminals (smartwatches), contact lenses, VR / AR / MR glasses, etc.

[0110] Figure 2This is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

[0111] like Figure 2 As shown, an electronic device according to an embodiment of the present invention may include a frame 100, a projection device 200, and a display unit 300.

[0112] In addition, the electronic device may also include an image rotation element (hereinafter referred to as "IRE"). A detailed description thereof will be provided below.

[0113] The electronic device can be provided as eyeglasses (smart glasses). The eyeglasses-type electronic device can be configured to be worn on the head and can include a frame (shell, housing, etc.) 100 for it. The frame 100 can be formed of a flexible material for ease of wear.

[0114] The frame 100 is supported on the head and has space for various components to be installed therein. As shown, electronic components such as a projection device 200, a user input unit 130, or an audio output unit 140 can be mounted on the frame 100. In addition, lenses covering at least one of the left and right eyes can be detachably mounted on the frame 100.

[0115] As shown in the figure, the frame 100 may be in the form of glasses worn on the user's face, but the present invention is not limited to this, and the frame 100 may be in the form of goggles or similar items worn in close contact with the user's face.

[0116] Frame 100 may include a front frame 110 having at least one opening and a y-direction intersecting the front frame 110 (based on...). Figure 2 A pair of side frames 120 that extend and are parallel to each other.

[0117] The frame 100 may have a length DI along the x-direction and a length LI along the y-direction, which may be the same as or different from each other.

[0118] The projection device 200 is configured to control various electronic components located in the electronic device. The projection device 200 can be used interchangeably with "light output device", "light projection device", "light illumination device", "optical device", "projector", etc.

[0119] The projection device 200 can generate an image or a video of a series of images to be displayed to a user. The projection device 200 may include an image source panel for generating the image and multiple lenses for diffusing and converging the light generated from the image source panel.

[0120] The projection device 200 can be fixed to either of the two side frames 120. For example, the projection device 200 can be fixed inside or outside either side frame 120, or embedded and integrally formed in either side frame 120. Alternatively, the projection device 200 can be fixed to the front frame 110 or disposed separately from the electronic device.

[0121] The display unit 300 can be implemented in the form of an HMD (Head-Mounted Device). An HMD refers to a display scheme that is mounted on the head and displays video directly in front of the user's eyes. When the user wears the electronic device, the display unit 300 can be configured to correspond to at least one of the left and right eyes to provide video directly in front of the user's eyes. In the accompanying drawing, the display unit 300 is shown positioned at the location corresponding to the right eye, outputting video toward the user's right eye. However, as mentioned above, the display unit 300 is not limited to this and can be positioned in front of both the left and right eyes.

[0122] The display unit 300 allows images generated by the projection device 200 to be displayed to the user, while the user visually perceives the external environment. For example, the display unit 300 can use a prism to project images onto the display area.

[0123] Furthermore, the display unit 300 can be formed to be light-transmitting, allowing the projected image and the general field of view (the range visible to the user through their eyes) to be viewed simultaneously. For example, the display unit 300 can be semi-transparent and can be formed from optical elements including glass. For example, the display unit 300 can be a light guide device or may include a light guide device.

[0124] Furthermore, the display unit 300 can be inserted into and secured to an opening included in the front frame 110, or located on the rear surface of the opening (i.e., between the opening and the user) to be secured to the front frame 110. The accompanying drawings illustrate, by way of example, the display unit 300 being located on the rear surface of the opening and secured to the front frame 110; however, unlike this, the display unit 300 can be positioned and secured at various locations on the frame 100.

[0125] like Figure 2 As shown, in the electronic device, when image light (or emitted light) for an image from the projection device 200 is incident on one side of the display unit 300, the image light (or emitted light) for an image is emitted through the display unit 300 to the other side to display the image generated by the projection device 200 to the user.

[0126] Therefore, a user can view the image generated by the projection device 200 while simultaneously viewing the external environment through the opening in the frame 100. In other words, the video output by the display unit 300 can appear to overlap with the normal field of view. Electronic devices can provide augmented reality (AR), where these display features are used to overlay virtual images onto a real image or background to display an image.

[0127] In addition to the operations described above, the external environment and the image generated by the projection device 200 can be provided to the user with a time difference within a short period of time that is imperceptible to humans. For example, within a frame, the external environment can be provided to the user during one segment, and the video from the projection device 200 can be provided to the user during another segment.

[0128] Alternatively, both overlap and time difference can be provided.

[0129] Furthermore, the projection device according to the embodiments may have the structure described below, or may be configured to further include waveguides and / or glass in the described structure. Additionally, the projection device may include a digital light processing (DLP) projector or a projection device.

[0130] Figure 3 This is a perspective view of the projection device according to an embodiment. Figure 4 This is another perspective view of the projection device according to an embodiment. Figure 5 This is an exploded perspective view of the projection device according to an embodiment, and Figure 6 It is along Figure 3 The sectional view taken by line A-A' in the middle.

[0131] refer to Figures 3 to 6 The projection device 200 according to the embodiment may include a housing 210, a light source unit 220, a first lens unit 230, a second lens unit 240, a second reflector 252, a first reflector 251, a third lens 261, a fourth lens 262, a reflection unit 253, a fifth lens 263, a prism 270, a light modulator 280, a projection lens unit 290, and a blocking member TP.

[0132] The housing 210 may have a space or housing recess therein for accommodating or housing each component of the projection device 200. The housing 210 may be located outside the projection device 200. For example, the light source unit 220, the first lens unit 230, the second lens unit 240, the second reflector 252, the first reflector 251, the third lens 261, the fourth lens 262, the reflection unit 253, the fifth lens 263, the prism 270, the light modulator 280, and the projection lens unit 290 may be disposed in the housing 210.

[0133] Furthermore, the housing 210 may have a structure with an opening on one side. Therefore, each of the aforementioned components can be assembled through the opening area or surface. Additionally, the blocking member TP, which will be described below, may be provided in the opening area or on the surface of the housing 210.

[0134] The housing 210 can have various shapes. For example, the housing 210 can have a hexahedral structure. Therefore, the projection device according to the embodiment can be easily mounted on an electronic device. Furthermore, the projection device according to the embodiment can be easily miniaturized or manufactured to be compact.

[0135] The light source unit 220 can be disposed in the housing 210. The light source unit 220 can be disposed adjacent to any one of the outer surfaces of the housing 210.

[0136] The light source unit 220 may include at least one light source. In an embodiment, the light source unit 220 may include a first light source 221 and a second light source 222. The first light source 221 and the second light source 222 may be positioned adjacent to different surfaces within the housing 210. A detailed description thereof will be provided below.

[0137] Furthermore, the first light source 221 and the second light source 222 can emit light of different wavelengths or colors. One of the first light source 221 and the second light source 222 can emit light of a different wavelength than the other. One of the first light source 221 and the second light source 222 can emit at least two of red, green, and blue light. Additionally, the other can emit other types of light. For example, the first light source 221 can emit light with a green wavelength. For example, in the first light source 221, the green wavelength light can have a center wavelength. Furthermore, the second light source 222 can emit red and blue light. For example, in the second light source 222, the red and blue light can have a center wavelength.

[0138] Furthermore, both the first light source 221 and the second light source 222 may have a diagonal length of several millimeters (mm). For example, both the first light source 221 and the second light source 222 may have a diagonal length of 1.635 mm.

[0139] Furthermore, in the projection device according to the embodiment, the first direction may correspond to the "X-axis direction" in the figures. The first direction may correspond to the direction from the first light source 221 toward the projection lens unit 290. Alternatively, the first direction may correspond to the direction from the first surface of the housing 210 toward its third surface. Furthermore, the second direction may correspond to the Y-axis direction in the figures. The second direction may be a direction perpendicular to the first direction. The third direction may be a direction perpendicular to both the first and second directions. Furthermore, the third direction may correspond to the "Z-axis direction" in the figures.

[0140] Furthermore, in the light source unit 220, the first light source 221 and the second light source 222 can emit light in different directions. In other words, the light emission direction from the first light source 221 and the light emission direction from the second light source 222 may not be parallel to each other.

[0141] The lens unit in the projection device may be located at the rear end of the light source unit. In an embodiment, the lens unit may include a first lens unit 230 located at the rear end of the first light source 221 and a second lens unit 240 located at the rear end of the second light source 222.

[0142] The first lens unit 230 may be disposed adjacent to the first light source 221. Light emitted from the first light source 221 may pass through the first lens unit 230. The first lens unit 230 may be located on one side of the first light source 221 in a first direction (X-axis direction). Alternatively, the first lens unit 230 may be located in the direction in which light is emitted from the first light source 221.

[0143] The second lens unit 240 can be disposed adjacent to the second light source 222. Light emitted from the second light source 222 can pass through the second lens unit 240. The second lens unit 240 can be located on one side of the second light source 222 in the second direction (Y-axis direction). The second lens unit 240 can be located in the direction in which light is emitted from the second light source 222.

[0144] Furthermore, the second light source 222 and the first light source 221 can be disposed separately from each other in the second direction (Y-axis direction). For example, the second light source 222 can be disposed at least partially offset from the first light source 221 in the first direction (X-axis direction). In other words, the second light source 222 can not overlap with the first light source 221 at least partially in the first direction (Y-axis direction).

[0145] Furthermore, the first lens unit 230 may be disposed separately from the second lens unit 240 in the second direction (Y-axis direction). For example, the second lens unit 240 may be disposed at least partially offset from the first lens unit 230 in the first direction (X-axis direction). In other words, the second lens unit 240 may not overlap with the first lens unit 230 at least partially in the first direction (Y-axis direction).

[0146] The first lens unit 230 may include at least one lens. The first lens unit 230 may include a 1-1 lens 231 and a 1-2 lens 232.

[0147] The 1-1 lens 231 can be configured such that light emitted from the first light source 221 is incident upon it. The 1-1 lens 231 can be located at the rear end of the first light source 221. In this embodiment, the rear end is described based on the direction of travel of the light emitted from the light source. Furthermore, light can be emitted from the light source and output to the outside through the projection lens unit 290. Therefore, the projection lens unit 290 can be located at the rear end of the light source unit.

[0148] Lens 231 (1-1) may overlap with the first light source 221 in the first direction (X-axis direction). Furthermore, lens 232 (1-2) may be configured such that light passing through lens 231 is incident on it. Lens 232 (1-2) may be located at the rear end of lens 231. Based on the direction of light travel emitted from the first light source 221, the first light source 221, lens 231 (1-1), and lens 232 (1-2) may be arranged sequentially.

[0149] Lens 232 1-2 can overlap with the first light source 221 and lens 231 1-1 in the first direction (X-axis direction). Therefore, lens 231 1-1 and lens 232 1-2 can collect light emitted from the first light source 221.

[0150] This configuration reduces light loss from the light source unit (e.g., the first light source) and facilitates a reduction in the size of the projection device.

[0151] The second lens unit 240 may include at least one lens. The second lens unit 240 may include a 2-1 lens 241 and a 2-2 lens 242.

[0152] 2-1 Lens 241 can be configured such that light emitted from the second light source 222 is incident on it. 2-1 Lens 241 can be located at the rear end of the second light source 222.

[0153] Lens 241 (2-1) may overlap with the second light source 222 in the second direction (Y-axis direction). Furthermore, lens 242 (2-2) may be configured such that light passing through lens 241 is incident on it. Lens 242 (2-2) may be located at the rear end of lens 241. Based on the direction of light travel emitted from the second light source 222, the second light source 222, lens 241 (2-1), and lens 242 (2-2) may be arranged sequentially. Lens 242 (2-2) may be located above lens 241 (2-1). In this specification, the term "above" refers to one side in the second direction (Y-axis direction). For example, lens 2 (2-2) may be located above lens 2 (2-1), and lens 2 (1) may be located below lens 2 (2-2).

[0154] In addition, lens 241 can be located on the second light source 222.

[0155] Lens 242 2-2 can overlap with the second light source 222 and lens 241 2-1 in the second direction (X-axis direction). Therefore, lens 241 2-1 and lens 242 2-2 can collect light emitted from the second light source 222.

[0156] This configuration reduces light loss from the light source unit (e.g., a second light source) and facilitates a reduction in the size of the projection device.

[0157] In the first lens unit 230 and the second lens unit 240, the lens adjacent to the light source (i.e., lens 1-1 and lens 2-1) can be a first collimating lens, and the lens adjacent to the reflecting mirror (i.e., lens 1-2 and lens 2-2) can be a second collimating lens.

[0158] In this case, the lenses adjacent to the light source in the first lens unit 230 and the second lens unit 240 satisfy the following mathematical formula 1.

[0159] [Mathematical Expression 1]

[0160]

[0161] At this point, the optical extension of the lens unit can be equal to the optical extension of the light source (e.g., a light-emitting diode (LED)).

[0162] Here, A represents the surface area, which can be calculated as "πr". 2 Furthermore, n represents the refractive index of the lens unit. Additionally, θ represents the angle of incidence of light on the lens unit. Finally, F represents the focal length of the lens unit.

[0163] Furthermore, the lenses adjacent to the reflector in the first lens unit 230 and the second lens unit 240 satisfy the following mathematical formula 2.

[0164] [Mathematical Expression 2]

[0165] Focal length of the lens adjacent to the light source: Focal length of the lens adjacent to the reflector = Area of ​​the light source: Area of ​​the target illumination

[0166] Therefore, Table 1 below can be applied to the first lens unit and the second lens unit according to the embodiment.

[0167] [Table 1]

[0168] Furthermore, in each lens unit, the diagonal length of the lens adjacent to the light source can be several millimeters. For example, the diagonal length of the lens adjacent to the light source in each lens unit can be 4 mm. Furthermore, the shape and optical characteristics of each lens in the lens unit can be determined based on mathematical formulas 1 and 2 described above and Table 1. The first reflecting mirror 251 and the second reflecting mirror 252 can be located at the rear end of the first lens unit 230 or the second lens unit 240. For example, the first reflecting mirror 251 and the second reflecting mirror 252 can be located on one side of the first light source 221 in a first direction, or on one side of the first lens unit 230 in a first direction (X-axis direction). Furthermore, the first reflecting mirror 251 and the second reflecting mirror 252 can be separately disposed from the first light source 221 or the first lens unit 230 in the first direction (X-axis direction). Furthermore, the first reflecting mirror 251 and the second reflecting mirror 252 can transmit light emitted from the first light source 221 (or the second light source) and light transmitted through the first lens unit 230 (or the second lens unit) (or emitted from the first lens unit 230 (or the second lens unit)).

[0169] More specifically, the first reflector 251 and the second reflector 252 can transmit light emitted from the first light source 221 and the first lens unit 230. Furthermore, the first reflector 251 and the second reflector 252 can reflect light emitted from the second light source 222 and light transmitted through the second lens unit 240. Additionally, the second reflector 252 can transmit light that has already passed through the first reflector 251. With this configuration, light emitted from the first light source 221 and the second light source 222 can be converged by the first lens unit and the second lens unit while simultaneously incident on the third lens 261 at the rear end. Therefore, the light required for optical modulation or image generation can be incident on the light modulator 280.

[0170] Furthermore, the second reflector 252 may be disposed at the rear end of the first reflector 251. The first reflector 251 and the second reflector 252 may be tilted at a predetermined angle relative to the X-axis or Y-axis. Additionally, the first reflector 251 and the second reflector 252 may have different tilt angles relative to the X-axis or Y-axis.

[0171] Furthermore, the distance between one end of the first reflector 251 and one end of the second reflector 252 can be the same as or different from the distance between the other ends of the first reflector 251 and the second reflector 252. For example, the distance g1 between one end of the second reflector 252 and one end of the first reflector 251 can be different from the distance g2 between the other ends of the second reflector 252 and the other ends of the first reflector 251. Moreover, the distance g1 between one end of the second reflector 252 and one end of the first reflector 251 can be smaller than the distance g2 between the other ends of the second reflector 252 and the other ends of the first reflector 251.

[0172] Furthermore, the first reflector 251 and the second reflector 252 can have different lengths. For example, the lengths of the first reflector 251 and the second reflector 252 in the XY plane can be different from each other. For example, the length of the second reflector 252 located at the rear end can be greater than the length of the first reflector 251.

[0173] Furthermore, the first reflector 251 and the second reflector 252 may include dichroic mirrors. The first reflector 251 may include a dichroic mirror for red, and the second reflector 252 may include a dichroic mirror for blue. Therefore, the first reflector 251 can reflect light in the red band, and the second reflector 252 can reflect light in the blue band.

[0174] The third lens 261 can be disposed behind the second reflector 252 and the first reflector 251. The third lens 261 can at least partially overlap with the second reflector 252 and the first reflector 251 in a first direction (X-axis direction). In addition, the third lens 261 can also at least partially overlap with the first light source 221 and the first lens unit 230 in the first direction.

[0175] The third lens 261 and the fourth lens 262, which will be described below, may be located between the reflecting unit 253 and the lens units 230 and 240. Alternatively, the third lens 261 and the fourth lens 262, which will be described below, may be located between the reflecting unit 253 and the first reflecting mirror (or the second reflecting mirror). The third lens 261 and the fourth lens 262 may be arranged sequentially.

[0176] Furthermore, the third lens 261 can transmit light that has passed through the second reflecting mirror 252 and light that has been reflected by the first reflecting mirror 251. The third lens 261 may include a compound eye lens (FEL). For example, the third lens 261 may be formed as an array of small lenses. Therefore, the third lens 261 can focus and converge light rays. Furthermore, the third lens 261 can focus light rays incident over an entire area onto a single point or small area, or it can diffuse light rays. In an embodiment, the third lens 261 can collect light rays. Additionally, the third lens 261 can reflect or refract light rays depending on the surface and shape of each lens, or it can separate light rays of a specific wavelength.

[0177] The third lens 261 may have a diagonal length of several millimeters or less. For example, the third lens 261 may have a diagonal length of 0.797 mm.

[0178] Furthermore, the third lens 261 can be disposed between the first reflector 251 and the fourth lens 262. The first reflector 251 can be located at the front end of the third lens 261. Furthermore, the fourth lens 262 can be disposed at the rear end of the third lens 261. Thus, in this specification, each component of the projection device can be located between a component located at the front end and a component located at the rear end. For example, the third lens 261 can be located between at least one of the light source unit, the first lens unit, the second lens unit, the first reflector, and the second reflector, and at least one of the fourth lens, the reflection unit, the fifth lens, the prism, the light modulator, and the projection lens unit. This positional relationship can also be similarly applied to other components.

[0179] The fourth lens 262 can be disposed at the rear end of the third lens 261. The fourth lens 262 can be disposed on one side of the third lens 261 along the first direction (X-axis direction). The fourth lens 262 can at least partially overlap with the third lens 261 in the first direction (X-axis direction). Similarly, the fourth lens 262 can at least partially overlap with the second reflector 252, the first reflector 251, the first lens unit 230, and the first light source 221 in the first direction (X-axis direction). This configuration facilitates miniaturization of the projection device.

[0180] The fourth lens 262 may include a relay lens. The fourth lens 262 can transmit light emitted from or transmitted through the third lens 261. The fourth lens 262 can transport light from one location to another. That is, the fourth lens 262 can align or change the path of light. Furthermore, the fourth lens 262 can adjust the size of the illumination or image provided by the illumination system (i.e., the maximum area of ​​the light rays), or can compensate for optical differences.

[0181] The reflecting unit 253 can be located at the rear end of the fourth lens 262. The reflecting unit 253 can be located on one side of the fourth lens 262 along the first direction (X-axis direction). The reflecting unit 253 can be separately disposed from the fourth lens 262 in the first direction.

[0182] Furthermore, the reflecting unit 253 can be tilted relative to the fourth lens 262 at a predetermined angle. The reflecting unit 253 can reflect light emitted from the fourth lens 262. For example, light that has passed through the fourth lens 262 can be reflected by the reflecting unit 253, directed towards the projection lens unit, and then reflected downwards.

[0183] The reflecting unit 253 can be tilted at a predetermined angle relative to the fourth lens 262, the first direction, etc. With this configuration, the length of the projection device according to the embodiment in the second direction can be minimized.

[0184] The fifth lens 263 may be disposed at the rear end of the reflecting unit 253. The fifth lens 263 may be disposed below the reflecting unit 253. The fifth lens 263 may at least partially overlap with the reflecting unit 253 in the second direction.

[0185] The fifth lens 263 can be disposed between the reflecting unit 263 and the prism 270.

[0186] Both the fourth lens 262 and the fifth lens 263 can have a diagonal length of several millimeters. For example, the fourth lens 262 can have a diagonal length of 3.5 mm, and the fifth lens 263 can have a diagonal length of 6 mm. The diagonal length of each of the above components can vary within a range of 20% to achieve optical performance and miniaturization within the indicated range.

[0187] The fifth lens 263 may include a relay lens. The fifth lens 263 can transmit light reflected from the reflecting unit 253. The fifth lens 263 can transfer light from one location to another. That is, the fifth lens 263 can align or change the path of light. Furthermore, the fifth lens 263 can adjust the size of the illumination or image provided by the illumination system (i.e., the maximum area of ​​light), or can compensate for optical differences.

[0188] Furthermore, the fourth lens 262, the reflecting unit 253, and the fifth lens 263 can be arranged sequentially such that light emitted from or transmitted through the second reflecting mirror 252 and the first reflecting mirror 251 is incident on them.

[0189] Furthermore, the emitting surface of the fifth lens 263 can be located above the emitting surface of the 2-1 lens 241. Additionally, the emitting surface of the fifth lens 263 can be located above the emitting surface of the 2-2 lens 242.

[0190] Prism 270 can be disposed at the rear end of fifth lens 263. Furthermore, prism 270 can be disposed sequentially with fifth lens 263. Additionally, prism 270 can be located below fifth lens 263. Prism 270 and fifth lens 263 can partially overlap each other in the second direction. Furthermore, a portion of prism 270 may not overlap with fifth lens 263 in the second direction. With this configuration, prism 270 can transmit light emitted from (or transmitted through) fifth lens 263, and can reflect transmitted light incident on and re-emitted from light modulator 280 to projection lens unit 290.

[0191] Prism 270 may include a total internal reflection (TIR) ​​prism. As described above, prism 270 can change the direction of light travel. That is, prism 270 can perform both transmission and reflection of light. Specifically, prism 270 can transmit light emitted from (or transmitted through) the fifth lens 263 and reflect light emitted from the light modulator 280. Furthermore, prism 270 can transmit light emitted from the light source unit 220 and reflect light emitted from the light modulator 280. Therefore, the path of light can be changed towards the first direction or the projection lens unit. With this configuration, miniaturization of the projection device according to the embodiment can be achieved.

[0192] Prism 270 can be disposed between light modulator 280 and projection lens unit 290. Alternatively, prism 270 can be disposed between fifth lens 263 and light modulator 280.

[0193] The optical modulator 280 can be located at the rear end of the prism 270. The optical modulator 280 can emit light that has been transmitted through the prism 270 back towards the prism 270.

[0194] The light modulator 280 can reflect incident light to project an image. For example, the light modulator 280 can transmit or project video or images based on an image signal incident through the substrate SB. That is, the light modulator 280 can modulate the light emitted from the light source unit 220.

[0195] The light modulator 280 according to an embodiment may include a digital micromirror device (DMD). The light modulator 280 may include a plurality of micromirrors. Furthermore, each micromirror may reflect or block light in response to a signal (e.g., a digital signal). In other words, the light modulator 280 may control the state of each micromirror based on an image signal applied through the substrate SB, and may project an image corresponding to the image signal. For example, when controlling the micromirrors to reflect light, bright areas of the image may be displayed, and when light is blocked, dark areas of the image may be displayed.

[0196] Furthermore, the second direction (Y-axis direction) can correspond to a direction perpendicular to the top surface of the light modulator 280. For example, the light modulator 280 can have a diagonal length of several inches or less. The diagonal length of the light modulator 280 can be 0.15 inches or more and 2.0 inches or less. Therefore, the diagonal length can be easily modified for miniaturization or for achieving the size of an image or light guide device.

[0197] The projection lens unit 290 can be disposed at the rear end of the prism 270. When light emitted from the light modulator 280 is reflected by the prism 270, the reflected light can be incident on the projection lens unit 290. The light can then be projected through the projection lens unit 290. The projection lens unit 290 can project light emitted from the projection device onto a screen or waveguide (or display unit).

[0198] In one embodiment, the projection lens unit 290 can adjust the size of the image so that light enters through the entrance pupil diameter (EPD) of a waveguide or the like.

[0199] Therefore, the projection lens unit 290 according to the embodiment may include a lens barrel 291 and a plurality of lenses (or optical systems) disposed in the lens barrel.

[0200] Multiple lenses L1 to L5 (see) Figure 21 It can at least partially overlap with prism 270 in the first direction.

[0201] A blocking member TP can be disposed on an outer surface of the housing 210. Therefore, after each component is housed in the housing 210, the blocking member TP can be disposed on the outside of each component. In an embodiment, the blocking member TP can be disposed on the side of the housing 210 corresponding to a recess in the housing 210. Furthermore, the blocking member TP can cover each component. With this configuration, the blocking member TP can effectively block foreign objects or stray light from flowing into the components of the housing 210. Therefore, image projection from the electronic device or projection device can be achieved more accurately.

[0202] The projection device 200 according to the embodiment may further include a substrate SB, fastening members SC1, SC2 and SC3, and reinforcing plates ST1, ST2 and ST3.

[0203] The substrate SB can be electrically connected to the light source unit 220 and the light modulator 280. The light source unit 220 and the light modulator 280 can be disposed on the substrate SB. In addition, the substrate SB can be disposed in the housing 210. For example, the substrate SB can be disposed along the outer surface of the housing 210.

[0204] The operation of the light modulator 280 and the light source unit 220 can be controlled via the substrate SB. The substrate SB can communicate with the control unit of an external device, etc., via wired or wireless communication. For example, control signals from an external source can be sent to a projection device via the substrate SB. Furthermore, the projection device can output an image based on the sent control signals.

[0205] Fastening members SC1, SC2, and SC3 can be disposed on the outer side of the substrate SB. Therefore, the bonding strength between the substrate SB, housing 210, light source unit 220, and light modulator 280 can be improved. Furthermore, since the substrate SB is disposed on the outside of the housing 210, the degree of freedom in assembly or design can be increased.

[0206] Reinforcing plates ST1, ST2, and ST3 can be disposed on the outer side of the substrate SB. Furthermore, reinforcing plates ST1, ST2, and ST3 can be reinforcing members formed of various materials such as metal, composite materials, and resin (plastic). Reinforcing plates ST1, ST2, and ST3 can be disposed on the outer side of the substrate SB to improve the rigidity and strength of the substrate SB and the housing. For example, reinforcing plates ST1, ST2, and ST3 can be disposed on the substrate SB corresponding to the positions of the light source unit 220 and the light modulator 280. This configuration can suppress deformation caused by heat generated by the light source unit 220 and the light modulator 280. Furthermore, reinforcing plates ST1, ST2, and ST3 can protect the projection device from external impacts.

[0207] Fastening components SC1, SC2 and SC3 can pass through reinforcing plates ST1, ST2 and ST3.

[0208] For example, the fastening components may include a first fastening component SC1, a second fastening component SC2, and a third fastening component SC3. The reinforcing plate may include a first reinforcing plate ST1, a second reinforcing plate ST2, and a third reinforcing plate ST3.

[0209] The first fastening member SC1 and the first reinforcing plate ST1 can be positioned corresponding to the first light source 221. The first fastening member SC1 and the first reinforcing plate ST1 can overlap with the first light source 221 in a first direction.

[0210] The second fastening member SC2 and the second reinforcing plate ST2 can be positioned corresponding to the second light source 222. The second fastening member SC2 and the second reinforcing plate ST2 can overlap with the second light source 222 in the second direction.

[0211] The third fastening member SC3 and the third reinforcing plate ST3 can be positioned corresponding to the optical modulator 280. The third fastening member SC3 and the third reinforcing plate ST3 can overlap with the optical modulator 280 in the second direction (Y-axis direction).

[0212] Furthermore, fastening members can pass through corresponding reinforcing plates to improve the bonding strength between the substrate and the housing 210. Additionally, a third fastening member SC3 can pass through the optical modulator 280 to improve the bonding strength between the optical modulator 280, the housing 210, and the substrate SB.

[0213] In the modified example, the reinforcing plate can be integrally formed to correspond to the substrate SB, instead of being configured as multiple reinforcing plates. That is, the reinforcing plate can have a structure extending from the first light source 221 to the light modulator 280.

[0214] Furthermore, the substrates can be individually configured corresponding to each light source and light modulator. Additionally, fastening members can be disposed on multiple substrates separately. Alternatively, each fastening member can pass through all of the multiple substrates. Therefore, multiple substrates can be coupled to each other via a single fastening member. Thus, the number of fastening members can be set differently, either odd or even.

[0215] According to an embodiment, one of the plurality of fastening members can couple the substrate of the second light source 222 (for the second light source) and the substrate of the light modulator 280 (for the light modulator) to the second surface 212 of the housing 210. Figure 9 middle).

[0216] In other words, one of the multiple fastening members can pass through or fasten both the substrate for the second light source and the substrate for the light modulator. Specifically, one of the fastening members can pass through or couple to both the substrate connected to the second light source and the substrate connected to the light modulator. With this configuration, the housing 210 can be coupled to both the substrate for the second light source and the substrate for the light modulator via the third fastening member SC3. Therefore, the reliability of the projection device according to the embodiment can be improved.

[0217] For example, the interpolator substrate ISB (see Figure 14 ) can be set on substrate SB (see Figure 14 The interpolator substrate can be an element of the light modulator 280. Furthermore, a third fastening member SC3 can pass through both the interpolator substrate and the substrate. Therefore, the third fastening member SC3 can pass through both the substrate for the second light source and the substrate for the light modulator, and can be coupled to the second surface of the housing.

[0218] Therefore, even when the second light source 222 and the light modulator 280 are disposed on the second surface of the housing 210, the number of fastening members (e.g., bolts) coupled to the second surface can be odd. Thus, the projection device according to the embodiment can simultaneously provide compactness and improved reliability.

[0219] Figure 7 and Figure 8 This is a view of the projection device according to an embodiment, wherein the housing has been removed.

[0220] The projection device according to the embodiments may include an illumination system and a projection system (also referred to as a projection system, projection unit, projection component, etc.).

[0221] refer to Figure 7 The projection device may include an illumination system. According to an embodiment, the illumination system may include a housing 210, a light source unit 220, a first lens unit 230, a second lens unit 240, a second reflector 252, a first reflector 251, a third lens 261, a fourth lens 262, a reflection unit 253, a fifth lens 263, and a prism 270. That is, light emitted from the prism 270 can be incident on the light modulator 280.

[0222] The illumination system may include a prism 270 as a component to receive light (illumination light) from a light source and emit light in a predetermined direction. The illumination light may be transmitted to or provided to a light modulator 280 of the projection system.

[0223] Further reference Figure 8 The projection system may include a prism 270, a light modulator 280, and a projection lens unit 290. The projection system may include the prism 270 as a component. In embodiments, the prism 270 may be a component of both the illumination system and the projection system.

[0224] In addition, the projection system may also include the aforementioned lighting system. That is, the projection system can modulate the illumination light generated by the lighting system through the light modulator 280, and emit or radiate the modulated light in a predetermined direction through the prism 270 and the projection lens unit 290.

[0225] The light modulator 280 can reflect illumination light into patterned light, etc., and the patterned light can pass through the projection lens unit 290 and be output to the outside of the projection device.

[0226] Furthermore, the optical folding component can be present between the output unit of the projection device and the input unit of the waveguide or wavelength waveguide. The optical folding component can be configured such that the optical path of the patterned light is folded along at least two different directions.

[0227] In this embodiment, as described above, the projection lens unit 290 may include a plurality of lenses. These lenses may include a first lens, a second lens, a third lens, and a fourth lens. The first lens may be located on the outermost side of the projection device 200. Furthermore, the first lens may be located closest to the light guide device or the waveguide or substrate closest to the light guide device. Therefore, light transmitted through the first lens can be guided to the substrate of the light guide device, etc.

[0228] Figure 9 This is a perspective view of the housing of the projection device according to an embodiment, and Figure 10 It shows that other components are inserted. Figure 9 The view.

[0229] refer to Figure 9 and Figure 10 In the projection device according to the embodiment, the housing 210 may include a plurality of outer surfaces.

[0230] The housing 210 may include a first surface 211, a second surface 212, a third surface 213, a fourth surface 214, a fifth surface 215, and a sixth surface 216.

[0231] In housing 210, a first surface 211 can be connected to a second surface 212, a fourth surface 214, a fifth surface 215, and a sixth surface 216. A second surface 212 can be connected to a first surface 211, a second surface 212, a third surface 213, a fifth surface 215, and a sixth surface 216. A third surface 213 can be connected to a second surface 212, a third surface 213, a fourth surface 214, a fifth surface 215, and a sixth surface 216. A fourth surface 214 can be connected to a first surface 211, a third surface 213, a fourth surface 214, a fifth surface 215, and a sixth surface 216. A fifth surface 215 can be connected to a first surface 211, a second surface 212, a third surface 213, a fourth surface 214, and a sixth surface 216. A sixth surface 216 can be connected to a first surface 211, a second surface 212, a third surface 213, and a fourth surface 214.

[0232] The first surface 211 may correspond to the second surface 212. The first surface 211 may face the second surface 212. The third surface 213 may correspond to the fourth surface 214. The third surface 213 may face the fourth surface 214. The fifth surface 215 may face the sixth surface 216. The fifth surface 215 may correspond to the sixth surface 216.

[0233] The housing 210 may include a housing recess or a recess 210g. In the housing 210, the recess 210g may have a structure that opens toward the fifth surface 215. Therefore, a blocking member can be disposed on the fifth surface 215. Furthermore, each component can be accommodated in the recess 210g of the housing 210 through the open fifth surface 215. That is, each component of the projection device can be assembled through the fifth surface 215.

[0234] Furthermore, the first surface 211 may include a first hole 211h. The substrate SB is disposed on the first surface 211, and an electrical connection between the first light source and the substrate SB can be made through the first hole 211h.

[0235] The second surface 212 may include a second hole 212h1 and a third hole 212h2. The second hole 212h1 allows for electrical connection between the second light source and the substrate SB. The third hole 212h2 allows for electrical connection between the substrate SB and the optical modulator.

[0236] The sixth surface 216 may include a fourth hole 216h. Through the fourth hole 216h of the sixth surface 216, the optical axis alignment (active alignment) of the projection lens unit and the subsequent application of bonding components (e.g., epoxy resin) can be easily performed.

[0237] An opening 210OP can be formed in the third surface 213 via a groove 210g. The opening 210OP of the housing 210 can correspond to the light output unit of the projection device. That is, light output from the projection device can be provided to the waveguide, etc., through the opening 210OP of the housing 210. The opening 210OP can be located adjacent to the projection lens unit.

[0238] Furthermore, the groove 210g of the housing 210 may have a step. In an embodiment, the length of the groove 210g in the Z-axis direction of the groove can be maximized in the region corresponding to the projection lens unit. With this configuration, the size adjustment of the lens in the projection lens unit can be easily achieved.

[0239] Furthermore, unlike other components, the region on the fifth surface 215 adjacent to the light modulator (e.g., the region overlapping with the light modulator in the Z-axis direction) may not be an opening. As for other components, the opening of the groove 210g may be formed in the fifth surface.

[0240] In this embodiment, the first light source 221 may be disposed on the first surface 211. Furthermore, the second light source 222 and the light modulator 280 may be disposed on the second surface 212.

[0241] The first surface 211 of the housing 210 may overlap with the light modulator 280 in the first direction (X-axis direction). In addition, the first surface 211 of the housing 210 may overlap with the light source unit 220, the first lens unit 230, the second lens unit 240, the second reflector 252, the first reflector 251, the third lens 261, the fourth lens 262, the reflection unit 253, the fifth lens 263, the prism 270 and the projection lens unit 290 in the first direction (X-axis direction).

[0242] Furthermore, in the embodiments, the first surface 211 and the second surface 212 of the housing 210 may contact each other and may form a corner (e.g., an edge or vertex).

[0243] As described above, in the projection device according to the embodiment, the volume of the housing 210 can be 3.35 cc or less. For example, the length of the housing 210 in the first direction can be in the range of 31 mm to 37 mm. The length of the housing in the second direction can be in the range of 13 mm to 18 mm. Furthermore, the length of the housing in the third direction can be in the range of 5 mm to 7 mm. Based on the above or below description, a smaller and more compact projection device can be provided.

[0244] Furthermore, in this embodiment, the 2-2 lens 242 may not overlap with the fifth lens 263 in the first direction (X-axis direction). In other words, the 2-2 lens 242 may be configured to be offset from the fifth lens 263 in the first direction (X-axis direction).

[0245] Furthermore, at least a portion of the 2-1 lens 241 may not overlap with the prism 270 and the projection lens unit 290 in the first direction (X-axis direction). In other words, at least a portion of the 2-1 lens 241 may be configured to be offset from the prism 270 and the projection lens unit 290 in the first direction (X-axis direction).

[0246] This configuration allows for easy securing of space for setting up the light modulator and prism within a small projection device.

[0247] Furthermore, at least a portion of the light modulator 280 may overlap with the 2-1 lens 241. For example, the light modulator 280 may at least partially overlap with the 2-1 lens 241 in the first direction (X-axis direction). Therefore, the second light source and the light modulator can be disposed on the substrate SB located on the second surface 212, thereby ensuring ease of assembly, etc.

[0248] The projection lens unit 290 may not overlap (or be superimposed) with the 2-1 lens 241 in the first direction (X-axis direction). In other words, the projection lens unit 290 may be configured to be offset from the 2-1 lens 241 in the first direction (X-axis direction).

[0249] Furthermore, the fifth lens 263 may not overlap (or be superimposed) with the 2-1 lens 241 in the first direction (X-axis direction). In other words, the fifth lens 263 may be configured to be offset from the 2-1 lens 241 in the first direction (X-axis direction).

[0250] Furthermore, at least a portion of the fifth lens 263 may overlap with the fourth lens 262 in the second direction (Y-axis direction). Additionally, the fifth lens 263 may at least partially overlap with the fourth lens 262 in the first direction (X-axis direction).

[0251] Furthermore, according to the embodiment, the third lens 261 and the 2-2 lens 242 may not overlap (or may be superimposed) in the first direction (X-axis direction). In other words, the third lens 261 and the 2-2 lens 242 may be configured to be offset from each other in the first direction (X-axis direction).

[0252] With this configuration, the volume of the housing 210 can be minimized, thereby achieving a compact electronic device.

[0253] Figure 11 This is a perspective view of the projection device according to an embodiment, wherein the tape has been removed. Figure 12 This is a perspective view of the projection device according to an embodiment, wherein the tape is separated. Figure 13a This is a cross-sectional view of the projection device according to an embodiment. Figure 13b yes Figure 13a Another example, and Figure 14 This is an exploded perspective view of the light source unit in the projection device according to an embodiment.

[0254] refer to Figures 11 to 13a In the projection device according to the embodiment, the substrate SB can be disposed on the outer surface (or surface) of the housing 210 on which the first light source, the second light source, and the light modulator are disposed. Alternatively, the substrate SB can be disposed on a surface on which the first light source, the second light source, and the light modulator are not mounted.

[0255] In this embodiment, the substrate SB may include a first sub-substrate SB1, a second sub-substrate SB2, and a third sub-substrate SB3. The first sub-substrate SB1 may be disposed on the first surface 211 of the housing 210. The first sub-substrate SB1 may be electrically connected to a first light source. The second sub-substrate SB2 may be disposed on the second surface 212. The second sub-substrate SB2 may be electrically connected to a second light source.

[0256] The first sub-substrate SB1 can be formed as a structure that is separate from or integrated with the second sub-substrate SB2. The second sub-substrate SB2 can have a structure that extends from one end of the first sub-substrate SB1 in a first direction.

[0257] The third sub-substrate SB3 can be disposed on the sixth surface 216. The third sub-substrate SB3 can have a structure in which the second sub-substrate SB2 extends upward from one side of it. Therefore, the bonding strength between the substrate SB and the housing can be improved. In addition, heat dissipation through the substrate SB can be promoted.

[0258] Furthermore, at least one fourth hole 216h may be present in the sixth surface 216. For example, when multiple fourth holes 216h are present, they may be sequentially arranged in the first direction. The fourth holes 216h may overlap with the projection lens unit 290 in the third direction. Therefore, the bonding member (e.g., epoxy resin) introduced through the fourth hole 216h can be uniformly distributed on the projection lens unit 290. Furthermore, before applying the bonding member, the projection lens unit 290 can be moved in the first direction as described above. For example, a clamp can be used to perform the movement of the projection lens unit 290.

[0259] Furthermore, a blocking member TP can be provided on the fifth surface 215. The blocking member TP can be larger than the opening on the fifth surface corresponding to the groove 210g of the housing 210.

[0260] Furthermore, the blocking member TP can have a structure that bends or extends into the sixth surface 216. Therefore, the blocking member TP can cover the components within the housing 210. Thus, unwanted light can be prevented from entering the area other than the lens of the projection lens unit 290 through the opening 210OP on the sixth surface 216. Furthermore, the blocking member TP can include a member aperture TPh provided in the area corresponding to the sixth surface 216. Through the member aperture TPh, light output from the projection lens unit 290 or the projection device can be provided to a waveguide, etc.

[0261] Further reference Figure 13b The second light source and the second lens unit 240 can overlap with the light modulator 280 in the first direction. In this case, as described above, miniaturization of the projection device can be achieved.

[0262] Furthermore, the second light source and the second lens unit 240 may not at least partially overlap with the light modulator 280 in the first direction. The second light source and the second lens unit 240 may be arranged separately from the light modulator 280 in the second direction. Therefore, the design freedom of each component can be increased, and enhanced optical performance can be promoted. In addition, as will be described below, the lens unit, the first reflector 251, the second reflector 252, the third lens 261, the fourth lens 262, the reflection unit 253, and the fifth lens 263 may be arranged to be tilted relative to the first direction, thereby achieving miniaturization of the projection device.

[0263] Furthermore, the second light source and the second lens unit 240 may overlap with the prism 270 in the first direction. Additionally, the second light source and the second lens unit 240 may also overlap with the projection lens unit in the first direction. Furthermore, the second light source and the second lens unit 240 may at least partially overlap with the fifth lens 263 in the first direction. For example, in the second lens unit 240, both the 2-1 lens 241 and the 2-2 lens 242 may overlap with the fifth lens 263 in the first direction.

[0264] refer to Figure 14 The optical modulator 280 may include the DMD as described above. Furthermore, the optical modulator 280 may be connected to a second sub-substrate SB of the substrate. The optical modulator 280 may also include an interpolator substrate ISB. The interpolator substrate ISB may also be disposed between the second sub-substrate SB2 and the DMD. This configuration enables improved input / output counting connectivity between the DMD and the substrate and facilitates electrical connection with the traces. The substrate SB may be electrically connected to the DMD via surface mount technology (SMT) or the like. Furthermore, the substrate SB may be bonded to the housing 210 via a bonding member (e.g., epoxy resin).

[0265] In the modified example, the DMD can be connected to the substrate SB without an interpolator substrate. Without the interpolator substrate, screw fastening is unnecessary. Therefore, the mass production rate of the projection device can be improved.

[0266] Figure 15 This is a cross-sectional view of the projection device according to an embodiment.

[0267] refer to Figure 15 In the projection device, the light source unit 220, the first lens unit 230, the second lens unit 240, the second reflector 252, the first reflector 251, the third lens 261, the fourth lens 262, and the third reflector 253 can be configured to be tilted relative to the top surface of the housing 210 or the light modulator 280. Furthermore, the light source unit 220, the first lens unit 230, the second lens unit 240, the second reflector 252, the first reflector 251, the third lens 261, the fourth lens 262, and the third reflector 253 can be configured to be tilted relative to a cross-section (or axis) AX1 or AX2 parallel to the top surface of the housing 210 or the light modulator 280. In the following description, the tilt angle is referred to with reference to the corresponding surface or the cross-section (or axis) parallel to the corresponding surface.

[0268] Furthermore, the cross section (or axis) AX2 parallel to the top surface of the housing 210 can also be parallel to the cross section (or axis) AX1 parallel to the top surface of the optical modulator 280. Additionally, the cross section (or axis) AX1 or AX2 parallel to the top surface of the optical modulator 280 can be parallel to the plane (XZ) or the first direction (X-axis direction).

[0269] Furthermore, the light source unit 220, the first lens unit 230, the second lens unit 240, the second reflector 252, the first reflector 251, the third lens 261, the fourth lens 262, and the third reflector 253 can be configured to have an inclination angle θ1 relative to a cross section (or axis) AX1 or AX2 parallel to the top surface of the housing 210 or the light modulator 280. Therefore, the distance between the center of any one of the light source unit 220, the first lens unit 230, the second lens unit 240, the second reflector 252, the first reflector 251, the third lens 261, the fourth lens 262, or the third reflector 253 in the second direction (Y-axis direction) can be increased towards the reflecting unit or in the first direction.

[0270] For example, the light source unit 220, the first lens unit 230, and the reflection unit 253 can be arranged sequentially along the optical axis OA, and can be configured to have a tilt angle θ1 relative to the cross-section (or axis) AX1 or AX2 parallel to the top surface of the housing 210 or the light modulator 280. The tilt angle θ1 can be in the range of 5° to 10°. Preferably, the tilt angle θ1 can be 7°. In this case, the tilt angle θ1 can correspond to the angle formed counterclockwise between the optical axis OA and the cross-section (or axis) AX1 or AX2 parallel to the top surface of the housing 210 or the light modulator 280 in the cross-section or figure. Furthermore, based on the first light source, the optical axis OA is illustrated. The optical axis OA' for the second light source (see...) Figure 17 The second light source 222 can at least partially overlap with the optical axis OA of the first light source. Furthermore, the tilt angle θ1 of the second light source 222 can correspond to the angle formed between the optical axis between the second light source 222 and the first reflector 251 and a plane (or axis) perpendicular to the cross-section (or axis) AX1 or AX2. This configuration avoids interference between components within the housing 210 and reduces the height of the projection device in the second direction, thus facilitating miniaturization.

[0271] Figure 16 yes Figure 15 An enlarged view of part K1 in the image. Figure 17 This is a perspective view of the light source unit, first lens unit, second lens unit, first reflector, second reflector, and third lens of the projection device according to an embodiment. Figure 18 This is a conceptual diagram of the first and second reflectors of the projection device according to an embodiment.

[0272] refer to Figure 16 Since the light source unit 220 includes a first light source 221 and a second light source 222 that emit light in different directions, the projection device includes a second reflector 252 and a first reflector 251 arranged at different tilt angles. The second reflector 252 can transmit light emitted from the first light source 221. In addition, the first reflector 251 can reflect light emitted from the second light source 222 and transmit light emitted from the first light source 221.

[0273] According to the embodiment, as described above, the second reflector 252 and the first reflector 251 can be tilted at different angles relative to the optical axis OA.

[0274] The second reflector 252 may have a tilt angle θ2 relative to the optical axis OA in the range of 39° to 46°. The tilt angle θ2 of the second reflector 252 relative to the optical axis OA may be in the range of -6° to 0° relative to 45° of the optical axis OA. In addition, the second reflector 252 may have a tilt angle relative to the cross section (or axis) AX1 or AX2 in the range of 46.7° to 50.7°, which cross section (or axis) AX1 or AX2 is parallel to the top surface of the housing 210 or the optical modulator 280.

[0275] The first reflector 251 may have a tilt angle θ3 relative to the optical axis OA in the range of 46.7° to 50.7°. The tilt angle θ3 of the first reflector 251 relative to the optical axis OA may be in the range of 1.7° to 5.7° relative to 45° of the optical axis OA. The first reflector 251 may have a tilt angle relative to a cross-section (or axis) AX1 or AX2 in the range of 53.7° to 57.7°, which is parallel to the top surface of the housing 210 or the optical modulator 280. For example, the second reflector 252 may have a tilt angle of 48.75° relative to a cross-section (or axis) AX1 or AX2, which is parallel to the top surface of the housing 210 or the optical modulator 280. Furthermore, the first reflector 251 may have a tilt angle of 55.71° relative to the cross section (or axis) AX1 or AX2, which is parallel to the top surface of the housing 210 or the light modulator 280. This configuration improves the manufacturability and performance of the projection device.

[0276] Furthermore, as described above, the second light source 222 can emit both red and blue light. Additionally, the second light source 222 can have separated regions that emit light of different wavelengths. For example, the region emitting red light and the region emitting blue light can be separated from each other. Therefore, by allowing the second reflector 252 and the first reflector 251 to have different tilt angles, color separation caused by the second light source 222 emitting light of different wavelengths can be minimized, and the optical centers (OC) of the first and second light sources can be easily aligned.

[0277] Further reference Figure 17 The second reflector 252 and the first reflector 251 satisfy the following mathematical expressions 3 and 4.

[0278] [Mathematical Expression 3]

[0279]

[0280] [Mathematical Expression 4]

[0281]

[0282] Here, Angle Red It is the angle (tilt angle) formed between the first reflecting mirror and the optical axis. blue It is the angle (tilt angle) formed between the second reflecting mirror and the optical axis. Additionally, Shift... R,B D represents the spacing between regions corresponding to different wavebands. B It is the diameter or length of the second reflecting mirror, and D R It is the diameter or length of the first reflecting mirror.

[0283] For example, when Shift R,B When D is 0.375mm, B It can be 5.783mm, and D B It can be 6.621mm, and when Decenter R When it is 0.3933mm, Angle Red It could be 41.758°, and Angle blue It could be 48.7102°.

[0284] Therefore, considering the optical center (OC) of the second light source emitting light of different wavelengths, the first and second reflectors can be set to be tilted.

[0285] refer to Figure 18According to the embodiment, the first reflector 251 or the second reflector 252 can be a dichroic mirror. A dichroic mirror can be used to separate or combine incident light according to its wavelength. The surface of the dichroic mirror uses a coating that selectively transmits or reflects light according to its wavelength, and may also use an anti-reflective (AR) coating to minimize reflectivity.

[0286] Furthermore, since the first reflector 251 and the second reflector 252 are formed by dichroic mirrors, the angle dependence of the first reflector 251 and the second reflector 252 can increase as the spectral bandwidth narrows. That is, the reflection and transmission characteristics of the first and second reflectors depend on a specific angle (tilt angle), and for example, when the spectrum is narrow, the reflection and transmission characteristics of the first reflector (or second reflector) as an optical device can vary according to the angle. Therefore, the wavelength of the light reflected or transmitted when light passes through the first reflector (or second reflector) can vary according to the angle (or tilt angle). Therefore, a filter can be additionally provided based on the angle (or tilt angle) of the first reflector (or second reflector) relative to the light that has already passed through the preceding first lens unit or second lens unit. For example, the filter can be additionally provided between the first lens unit and the first reflector, or between the second lens unit and the second reflector. For example, the filter can be a bandpass filter and can be designed or provided at a normal angle. Furthermore, as described above, the first reflector (or second reflector) can be designed or provided taking into account the reflection angle and the optical path. This configuration allows for easy delivery of desired performance while keeping the desired wavelength within the spectrum.

[0287] Furthermore, the first reflector 251 can reflect blue wavelength light. Additionally, the first reflector 251 can transmit green wavelength light. Furthermore, the second reflector 252 can reflect red wavelength light and transmit green wavelength light.

[0288] For example, the first reflector 251 (or the second reflector) may include a high-refractive-index layer IL1 and a low-refractive-index layer IL2 alternately stacked on the substrate SB. The high-refractive-index layer IL1 may be formed of a material having a higher refractive index than the low-refractive-index layer IL2.

[0289] The high-refractive-index layer IL1 and the low-refractive-index layer IL2 can satisfy the following mathematical formulas 5 and 6, respectively.

[0290] [Mathematical Expression 5]

[0291] tH=λ / 2nH*cosθ

[0292] [Mathematical Expression 6]

[0293] tL=λ / nL*cosθ

[0294] Here, t H It can be the thickness of the high refractive index layer, t L It can be the thickness of the low refractive index layer, n H It can be the refractive index of the high refractive index layer, n L It can be the refractive index of the low-refractive-index layer, and θ can be the reflection angle of the corresponding component (e.g., a mirror).

[0295] Figure 19 yes Figure 15 Enlarged view of part K2 in the image. Figure 20 The light in the prism of the light modulator in the projection device according to the embodiment is shown in the driving state.

[0296] refer to Figure 19 In the projection device according to the embodiment, the reflecting unit 253 can be configured to be at a predetermined distance from the sidewall of the recess (housing recess) of the housing 210. For example, the reflecting unit 253 can have a reflecting surface and a facing surface or a surface opposite to the reflecting surface. Furthermore, the facing surface of the reflecting unit 253 can be configured to be spaced apart from the sidewall of the recess of the housing 210 by a gap gap 1. Additionally, the facing surface of the reflecting unit 253 can be parallel to the sidewall of the recess of the housing 210. The sidewall of the housing recess facing the facing surface of the reflecting unit 253 can be used as a reference surface for a component or assembly. For example, the gap gap 1 can be in the range of 0.5 mm to 5 mm. This configuration improves ease of assembly.

[0297] Furthermore, the reflective unit 253 and the fifth lens 263 can be configured to be inclined relative to a cross-section (or axis) AX1 or AX2 parallel to the top surface of the housing 210 or the light modulator 280. Additionally, the reflective unit 253 and the fifth lens 263 can be configured to be inclined relative to a cross-section (or axis) AX3 perpendicular to the top surface of the light modulator 280. The cross-section (or axis) AX3 perpendicular to the top surface of the light modulator 280 can be perpendicular to the cross-section (or axis) AX1 or AX2 parallel to the top surface of the housing 210 or the light modulator 280.

[0298] The tilt angles θ4 and θ5 of the reflector unit 253 and the fifth lens 263 relative to the cross section (or axis) AX3 can be influenced by controlling the angle of the principal ray incident on the light modulator 280.

[0299] In this embodiment, the reflecting unit 253 may have a tilt angle θ4 relative to the cross-section (or axis) AX3 perpendicular to the top surface of the light modulator 280. Furthermore, the tilt angle θ4 of the reflecting unit 253 may be in the range of 48° to 56°. Additionally, the fifth lens 263 may have a tilt angle θ5 relative to the cross-section (or axis) AX3 perpendicular to the top surface of the light modulator 280. The tilt angle θ5 of the fifth lens 263 may be in the range of 1.8° to 5.8°. With this configuration, light efficiency, etc., can be improved based on the main ray incident on the light modulator.

[0300] For example, since the principal ray must be incident at twice the on-state angle of the light modulator 280 (e.g., 17°), it needs to pass through the reflector 253 and the fifth lens 263 and be incident on the prism at a predetermined angle (e.g., 3.831°). In this case, the tilt angle of the reflector 253 can be 52°, and the tilt angle of the fifth lens 263 can be 3.8°. Therefore, the projection device can provide improved optical performance.

[0301] In addition, further reference Figure 20 The optical modulator 280 and the prism can meet the requirements of Table 2 below.

[0302] [Table 2]

[0303] Here, the TIR angle can refer to the critical angle for total internal reflection. Furthermore, "difference" represents θ. TIR The difference between the angle θ and the TIR angle. DMD This indicates the angle of light incident on the light modulator. Therefore, in the on state, since the margin from the TIR angle is approximately 5° or greater, optical performance can be maintained during projection. Furthermore, when the light modulator is in a flat state, the margin from the TIR angle may be less than –5°, which may cause changes in the optical path. Furthermore, when the light modulator is in a closed state, the margin from the TIR angle is less than approximately -14°, which may also cause changes in the optical path. Here, the on state refers to the state where the reflectors are tilted in a specific direction, and in this case, a display can be generated. Furthermore, the flat state refers to the state where all reflectors are horizontally aligned. Furthermore, the closed state refers to the state where all reflectors are tilted in another direction or are deactivated. According to the embodiment, the incident angle of the principal ray of the light reflected by the reflecting unit and incident on the prism 270 can be in the range of 3° to 4°. With this configuration, light efficiency can be improved, and stray light can be effectively eliminated.

[0304] Figure 21 yes Figure 15 An enlarged view of section K3 in the image.

[0305] refer to Figure 21 In the projection device according to the embodiment, the projection lens unit 290 may be configured to be parallel or inclined relative to the cross section (or axis) AX1 or AX2, which is parallel to the top surface (or bottom surface) of the housing 210 or the light modulator 280.

[0306] For example, the projection lens unit 290 can be configured to have a tilt angle θ6 in the range of 5° to 10° relative to the cross section (or axis) AX1 or AX2, which is parallel to the top (or bottom) surface of the housing 210 or the light modulator 280. This configuration can provide miniaturization and performance improvement of the projection device.

[0307] Furthermore, when the projection lens unit 290 is configured to be parallel to a cross section (or axis) AX1 or AX2 that is parallel to the top surface (or bottom surface) of the housing 210 or the light modulator 280, the ease of assembly and manufacturing convenience can be improved.

[0308] Furthermore, the first to fifth projection lenses L1 to L5 arranged sequentially along the optical axis in the projection lens unit 290 satisfy the following Tables 3 to 7.

[0309] [Table 3]

[0310] Here, the unit for length, thickness, etc., is millimeters [mm]. The emitting side surface of each projection lens refers to the surface opposite to the light source side surface or the surface facing the prism, and the light source side surface of each projection lens corresponds to the surface facing the prism. Furthermore, the thickness of the emitting side surface of each projection lens represents the thickness of the projection lens itself, while the thickness of the light source side surface represents the distance between each projection lens and the projection lens or assembly located at the front end. Additionally, the diopter sign (positive / negative) can be applied according to the table.

[0311] [Table 4]

[0312] [Table 5] Third projection lens Launch side surface Light source side surface Conic constant (K) 0 Conic constant (K) 0 Fourth-order constant (A) -0.04378559 Fourth-order constant (A) -0.04379 6th-order constant (B) 0.00474903 6th-order constant (B) 0.004749 8th-order constant (C) -0.00107314 8th-order constant (C) -0.00107 10th order constant (D) 1.00E-04 10th order constant (D) 1.00E-04

[0313] [Table 6] Second projection lens Launch side surface Light source side surface Conic constant (K) 0 Conic constant (K) 0 Fourth-order constant (A) 0.066083203 Fourth-order constant (A) 0.022628 6th-order constant (B) -0.00402059 6th-order constant (B) 0.001532 8th-order constant (C) 5.53E-05 8th-order constant (C) -0.00054 10th order constant (D) -4.45E-05 10th-order constant (D) 6.33E-06 12th-order constant (E) 6.51E-06 12th-order constant (E) 2.27E-06

[0314] [Table 7]

[0315] In this embodiment, the emitting side surface of the fifth projection lens L5 in the projection lens unit 290 may have the largest radius of curvature among the first to fifth projection lenses L1 to L5. Furthermore, the first projection lens L1 may have the largest thickness among the first to fifth projection lenses L1 to L5. Additionally, the first projection lens L1 may have the largest effective diameter among the first to fifth projection lenses L1 to L5.

[0316] With this configuration, the incident pupil diameter (EPD) can be formed at the rear end of the projection lens unit 290 or outside the projection device, and the size of the light or image can be adjusted so that the light enters the EPD.

[0317] In addition, the aperture stop can be located within the projection lens unit.

[0318] Figure 22 This is a conceptual diagram of the third, fourth, and fifth lenses in the projection device according to an embodiment.

[0319] The third lens 261 is a compound eye lens (FEL), and the fourth lens 262 and the fifth lens 263 are relay lenses that can satisfy the following table and mathematical formula.

[0320] Table 8 shows data related to the third lens according to the embodiment. Here, FEL refers to the third lens.

[0321] [Table 8]

[0322] Here, under the constraint that the product of the X count and the Y count is 100, the number of FELs that can be accommodated within 5 mm can be calculated using an area ratio of 16:7.779 that satisfies the condition "number on the X-axis: number on the Y-axis". Furthermore, the angle reflecting the maximum tolerance of the prism's cone angle (e.g., the minimum angle θ = 7.7°) is applied to the following mathematical formula 7 for calculation.

[0323] [Mathematical Expression 7]

[0324] F (focal length of the third lens) = (D / 2) / tan(7.7°)

[0325] Here, D refers to the diameter of the small lens in the third lens.

[0326] Calculate the radius of the third lens using the following mathematical formula 8.

[0327] [Mathematical Expression 8]

[0328] R (radius of the third lens) = F × (n2 - n1) / n2

[0329] Here, F is the focal length of the third lens, n1 is the refractive index of air, and n2 is the refractive index of the third lens.

[0330] Here, F is the focal length of the FEL.

[0331] In addition, the thickness of the third lens is calculated using the following mathematical formulas 9 and 10.

[0332] [Mathematical Expression 9]

[0333] T (thickness of the third lens) = (D / 2) / tan(θ) FEL )

[0334] Here, θ FEL It is the inner incident angle of the third lens, and is calculated using the following mathematical formula 8.

[0335] [Mathematical Expression 10]

[0336] θ FEL =sin -1 (sin7.7° / 1.517 (refractive index of the third lens))

[0337] Here, the 7.7° angle is the minimum angle applied as described above. Furthermore, when light is incident on the prism, the maximum width (or area) after incident may increase compared to before incident. For example, when the ratio of the horizontal length to the vertical length of the light is 16:9, this ratio can be changed to 11.31:9, 16:12.73, etc.

[0338] Furthermore, the fourth and fifth lenses, which serve as relay lenses, can be applied according to the following mathematical formulas, tables, etc.

[0339] [Table 9]

[0340] In this embodiment, a fourth lens serving as a first relay lens and a fifth lens serving as a second relay lens can be applied according to the following description. That is, the position, angle, etc., of the lenses can be set. First, when the fifth lens is applied, the EPD can be positioned at the location of the light modulator, which serves as the DMD. For example, the EPD can be set to 4.065 mm. Furthermore, a light beam with a cone angle and size can be positioned at the location of the aforementioned third lens. Even considering the EPD, the fourth lens can be used to optimize the edge light beam angle due to its wide edge beam angle. Furthermore, using the aforementioned reflection unit and prism, the tilt and displacement of the fourth lens can be performed to match the incident angle of the light modulator (e.g., 34°).

[0341] In addition, it can be with Figure 22Apply mathematical formulas 11 and 12 in connection with each other.

[0342] [Mathematical Expression 11]

[0343]

[0344] [Mathematical Expression 12]

[0345] FEL (Third Lens) Focal Length: Relay Lens Focal Length = FEL (Third Lens) Spacing: DMD Spacing

[0346] Here, f2 is the focal length of the fourth lens. Furthermore, the focal length of the relay lens can refer to the focal lengths of the fourth and / or fifth lenses.

[0347] Considering the size, miniaturization, and performance of the optical modulator, the mathematical formulas for the design values ​​or applications of the light source unit, lens unit (particularly, the lens adjacent to the light source), third lens, fourth lens, and fifth lens can be modified. However, when the value is below the lower limit of the following range, problems such as optical performance degradation may occur, and when the value exceeds the upper limit, miniaturization becomes difficult. Regarding these ranges, the diagonal length of each light source can be 1.5 mm or more and 1.7 mm or less. More preferably, the diagonal length of each light source can be 1.6 mm or more and 1.66 mm or less. Furthermore, the lens adjacent to the light source in the lens unit (the first collimating lens) can have a diagonal length of 3.8 mm or more and 4.2 mm or less. More preferably, the lens adjacent to the light source in the lens unit (the first collimating lens) can have a diagonal length of 3.9 mm or more and 4.1 mm or less. Furthermore, the third lens, as an FEL, can have a diagonal length of 0.6 mm or more and 1.2 mm or less. More preferably, the third lens may have a diagonal length of 0.6 mm or more and 1.2 mm or less. More preferably, the diagonal length of the third lens may be 0.7 mm or more and 1.0 mm or less. Furthermore, the diagonal length of the fourth lens (relay lens 1) may be 3.0 mm or more and 4.0 mm or less. More preferably, the diagonal length of the fourth lens (relay lens 1) may be 3.3 mm or more and 3.7 mm or less. The diagonal length of the fifth lens (relay lens 2) may be 5.5 mm or more and 6.5 mm or less. More preferably, the diagonal length of the fifth lens (relay lens 2) may be 5.8 mm or more and 6.2 mm or less.

[0348] Figure 23 This is a perspective view of an electronic device according to an embodiment. Figure 24 This is a plan view of an electronic device according to an embodiment.

[0349] refer to Figure 23 and Figure 24 The electronic device according to an embodiment of the present invention includes a frame 100, a projection device (or projector) 200, an image rotation element IRE, and a display unit (or light guide device) 300. Furthermore, the above description can be applied in the same way. Here, the projector described in this specification can be applied to the electronic device described below.

[0350] An image rotation element IRE can be disposed between the projection device 200 and the light guide device 300. The image rotation element IRE can rotate the light emitted from the projection device 200 around the longitudinal direction of the image rotation element IRE. That is, the image rotation element IRE can perform the rotation of the projection light or image emitted from the projection device 200.

[0351] First, the image rotation element (IRE) can be disposed adjacent to the projection device 200 and spaced apart from the projection device by a first distance gap1. For example, the image rotation element (IRE) can be spaced apart from the projection device 200 in a second direction (Y-axis direction). Preferably, the image rotation element (IRE) can be spaced apart from the projection device 200 by 16 μm to 24 μm in the second direction (Y-axis direction). That is, the first distance gap1 can be approximately 20 μm. Furthermore, the first distance gap1 can be in the range of 16 μm to 24 μm. This configuration improves the ease of assembly, reduces optical loss, and prevents degradation of the accuracy of the projected image.

[0352] In this specification, the second direction (Y-axis direction) may correspond to the light emission direction from the projection device 200. Furthermore, the second direction (Y-axis direction) may correspond to the longitudinal direction or the long side of the projection device 200. That is, the projection device 200 may emit light in the second direction and may be arranged parallel to the second direction. Alternatively, the second direction may correspond to the extension direction of the side frame. Furthermore, the first direction (X-axis direction) may correspond to the width direction. Furthermore, the first direction (X-axis direction) may be parallel to the direction from the left eye to the right eye in an eyeglass-type electronic device. Furthermore, the first direction (X-axis direction) may be a direction perpendicular to the second direction. Furthermore, the projection device 200 may emit projection light from a side surface having a plane formed by the first and second directions. The third direction (Z-axis direction) may be a direction perpendicular to the first and second directions. The third direction (Z-axis direction) may correspond to the thickness direction.

[0353] Furthermore, the image rotation element IRE can be configured to be spaced apart from the light guide device 300 by a second distance gap2. For example, the image rotation element IRE can be configured to be spaced apart from the light guide device 300 by a second distance gap2 in a second direction (Y-axis direction). Moreover, the second distance gap2 can be 7 μm or greater. Therefore, the ease of assembly of the light guide device can be improved.

[0354] The projection device 200 according to the embodiment may have a predetermined field of view (FOV). The field of view (FOV) may also be referred to as the viewing angle. The field of view, etc., can vary depending on the size of the components in the light guide device, etc. For example, the field of view may be approximately 30°. Preferably, the field of view may be in the range of 20° to 40°. With this configuration, the size of the projection device in the electronic device can be easily reduced.

[0355] Furthermore, the direction of travel of the light (or projection light) emitted from the projection device 200 can be parallel to the second direction (Y-axis direction). Additionally, the direction of travel of the light (or projection light) emitted from the projection device 200 can be parallel to the longitudinal direction or the long side direction of the image rotation element IRE.

[0356] Furthermore, the projection device 200 may have a length L1 and a height H1 different from its width W1. In an embodiment, both the length L1 and the height H1 of the projection device 200 may be greater than the width W1. In the projection device 200, the light modulator may have a length greater than its width. The diagonal length of the light modulator may be approximately 0.16 inches. With this configuration, the first image IM1, which is a cross-section of the light emitted or projected from the projection device 200, may also have different horizontal and vertical lengths. In the image, the horizontal length may refer to the width, and the vertical length may refer to the height. In the first image IM1, the longer side may correspond to the height, and the shorter side may correspond to the width.

[0357] Furthermore, the image rotation element IRE can have a length L2 and a height H2 that are different from its width W2. In an embodiment, both the length L2 and the height H2 of the image rotation element IRE can be smaller than the width W2. For example, the length of the image rotation element IRE can be 7 mm. Additionally, the width of the image rotation element IRE can be 3.2 mm. The length can be varied within approximately ±20% of the above values, thereby enabling miniaturization and compatibility.

[0358] The projection device 200, the image rotation element IRE, and the light guide device 300 can overlap each other in the longitudinal direction or the second direction (Y-axis direction).

[0359] Therefore, the light projected from the projection device 200 can be rotated by the image rotation element IRE and provided to the light guide device 300 in a rotated state. Furthermore, the light guided by the light guide device 300 can ultimately be delivered to the user, etc. At this time, the image, as the cross-section of the light provided to the user, can be an image with a horizontal length greater than its vertical length.

[0360] Furthermore, by positioning the projection device 200 on the upper (or lower) part of the frame rather than the side, the increase in the width of the electronic device can be suppressed. Furthermore, by configuring the projection device 200 to have a height similar to or smaller than that of the light guide device, miniaturization of the electronic device can be achieved. Moreover, although the projection device 200 is located on the frame of the aforementioned electronic device, the image rotation element IRE can rotate the light emitted from the projection device 200 (projection light) so that the longer side (horizontal or vertical) of the image corresponds to the longer side of the light guide device. That is, the image rotation element IRE can adjust the horizontal and vertical ratio of the light (image or video) emitted from the projection device, so that an image or video with an appropriate horizontal and vertical ratio can be provided to the user through the light guide device. For example, the image rotation element IRE can rotate the light emitted from the projection device so that the horizontal length becomes the longer side. With this configuration, when the light emitted from the projection device 200 passes through the image rotation element IRE, the second image IM2, as the cross-section of the emitted light, can have a different horizontal and vertical ratio than the first image IM1. For example, even if the vertical length is greater than the horizontal length in the first image IM1, the horizontal length can be greater than the vertical length in the second image IM2.

[0361] An image rotation element (IRE) can have a trapezoidal cross-section parallel to the longitudinal direction or a second direction (Y-axis direction). Alternatively, an image rotation element IRE can have a rectangular cross-section perpendicular to the longitudinal direction (Y-axis direction). Furthermore, an image rotation element IRE can be a prism. For example, an image rotation element IRE can include a Dove prism.

[0362] Furthermore, the optical stops of the projection device 200 and the image rotation element IRE can be located at the first diffraction element region, which serves as an internal coupler for the light guide device 300 and will be described below. Therefore, miniaturization of the electronic device and improvement of its optical performance can be achieved.

[0363] Figure 25 This is a side view of the image rotation element, light guide device, and projection device in the electronic device according to an embodiment. Figure 26 This is a plan view of the image rotation element and projection device in the electronic device according to the embodiment. Figure 27 This is a front view of an image rotation element in an electronic device according to an embodiment. Figure 28 yes Figure 25 and Figure 26 A schematic cross-sectional view of the projected light at position P1. Figure 29 and Figure 30 yes Figure 25 and Figure 26 A schematic cross-sectional view of the projected light at position P2.

[0364] refer to Figure 25 and Figure 26 In this embodiment, the light guide device 300 may include a projection device 200, or may not include a projection device 200. For example, the light guide device 300 may include a projection device 200, a substrate, and a diffraction element (diffraction element region). Alternatively, the light guide device 300 may include a substrate and a diffraction element (diffraction element region).

[0365] The light guide device 300 according to the embodiment may include a substrate 311 and diffraction element units (312, 313, and 314). As described above, the light guide device 300 may be a structure separate from the projector 200. In this case, the projector 200 and the light guide device 300 are spaced apart from each other, and the rearmost lens of the projection device or projector 200 described below and the light guide device 300 may be spaced apart from each other. Furthermore, as described above, the projection device or projector 200 may include a projection lens unit 290, which includes a plurality of lenses and a lens barrel.

[0366] Furthermore, the diffraction element unit according to the embodiment may include multiple diffraction element regions. The diffraction element unit may be disposed on the substrate 311 and may have a nanoscale pattern. Thus, the diffraction element unit can diffract and guide light incident from the projection device or projector 200. For example, the diffraction element unit may include a first diffraction element region 312 and a second diffraction element region 314. Additionally, the diffraction element unit may include a third diffraction element region 313 located between the first diffraction element region 312 and the second diffraction element region 314. The first diffraction element region 312 may correspond to an "inner coupler." The second diffraction element region 314 may correspond to an "outer coupler." The third diffraction element region 313 may correspond to a folded grating.

[0367] The light guide device 300 can change the path of light output from and incident on the light output unit, and can output the light to the outside again. Light can be sequentially incident on the first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314, and can be output to the outside again. The incident direction of light on the light guide device 300 can correspond to a second direction. The second direction (Y-axis direction) can refer to the direction of light incident or its relative direction.

[0368] In an embodiment, substrate 311 can guide light emitted from a projection device or projector 200. Substrate 311 can serve as a path for transmitted light. A first diffraction element region 312, a third diffraction element region 313, and a second diffraction element region 314 can be disposed on substrate 311. Light can undergo total internal reflection within substrate 311 and travel along the interior of the substrate. Substrate 311 may include a waveguide. The first diffraction element region 312, the second diffraction element region 314, and the third diffraction element region 313 can be disposed separately from each other on substrate 311. Substrate 311 can extend in a first direction perpendicular to a second direction of light incidence. The refractive index of substrate 311 can be in the range of 1.4 to 2.0.

[0369] The first diffraction element region 312 can guide light incident on the substrate 311. That is, the first diffraction element region 312 can be used as a light guide. Alternatively, the first diffraction element region 312 can receive light. The first diffraction element region 312 can be used to guide light incident on the substrate 311. The first diffraction element region 312 can be disposed on the substrate 311. Light can be incident on the light guide device 300 from the outside or from the projection device or projector 200 through the first diffraction element region 312, and can be transmitted along the substrate 311 to the second diffraction element region 314 and the third diffraction element region 313. The first diffraction element region 312 can change the path of light by diffracting light.

[0370] The third diffraction element region 313 can be used to change the path of light. The third diffraction element region 313 can be disposed on the substrate 311. The third diffraction element region 313 can change the path of light incident through the first diffraction element region 312. By changing the path of light, the third diffraction element region 313 can guide light toward the second diffraction element region 314. The third diffraction element region 313 can change the path of light by diffracting light.

[0371] The second diffraction element region 314 can be used to guide light to the outside of a user or similar device. The second diffraction element region 314 can be disposed on the substrate 311. Light can be emitted to the outside of the light guide device 1000 through the second diffraction element region 314. The second diffraction element region 314 can receive light whose path has been altered by the first transmission element 1300 and emit the light to the outside. The second diffraction element region 314 can change the path of light and emit it to the outside. The first emitting diffraction element can change the path of light by diffracting it. The second diffraction element region 314 can be disposed separately from the first diffraction element region 312. Furthermore, the second diffraction element region 314 can emit light.

[0372] The first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314 may include a plurality of protrusions. The plurality of protrusions may have uniform width, spacing, and height, and may be disposed on the first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314. The plurality of protrusions may protrude in a first direction on the first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314. The plurality of protrusions may be disposed separately from each other in the vector direction of the pattern including the protrusions. Depending on the width, spacing, and height of the protrusions, the path of light passing through the first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314 may vary. The width of each protrusion may refer to the width measured in the vector direction of the pattern including the protrusions. The spacing of the protrusions may refer to the distance between a side surface of the protrusion and the same side surface of an adjacent protrusion in the vector direction of the pattern including the protrusions. The height of the protrusions may refer to the height of the protruding portion in the first direction. These protrusions may be disposed with a predetermined pattern.

[0373] In this embodiment, the first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314 may be formed of the same material or different materials. For example, the first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314 may be formed of the same material. Furthermore, the refractive index of each of the first diffraction element region 312, the third diffraction element region 313, and the second diffraction element region 314 may be in the range of 1.7 to 2.7.

[0374] Furthermore, the outlines (boundary regions) of the first diffraction element region 312 and the third diffraction element region 313 may not overlap. When the outlines (boundary regions) of the first diffraction element region 312 and the third diffraction element region 313 overlap, a portion of the light incident from the third diffraction element region 313 to the second diffraction element region 314 may be blocked, thus no image can be emitted from the corresponding region of the second diffraction element region 314. When the outlines (boundary regions) of the first diffraction element region 312 and the third diffraction element region 313 overlap, efficiency decreases; therefore, it is preferable that the outlines (boundary regions) of the first diffraction element region 312 and the third diffraction element region 313 do not overlap.

[0375] Although the projector 200 and IRE are in Figure 25 The IRE is shown as being arranged in a straight line, but it can be tilted at a predetermined angle relative to the projector 200 to adjust the proportion of light projected by the projector 200.

[0376] Further reference Figures 27 to 29 As described above, the image rotation element IRE can change the angle and scale of the light emitted from the projection device 200.

[0377] More specifically, the image rotation element IRE can rotate the image SS, which is a cross-section of the projection light projected from the projection device 200. For example, the image SS of the light incident on the image rotation element IRE can correspond to the first image described above.

[0378] exist Figure 25 and Figure 26 At the first position P1, the image, as a cross-section of the projected light, can have a major axis LA and a minor axis SA, such as... Figure 28 As shown. For example, the major axis LA can be an axis parallel to the Z-axis, and the minor axis SA can be an axis parallel to the X-axis. Here, based on Figure 28 An axis parallel to the major and minor axes is described, and this axis can change depending on the rotation of the image. Furthermore, the projection light emitted from the projection device 200 can form an image with a vertical length greater than its horizontal length.

[0379] like Figure 29 As shown, the image SS, which is the cross-section of the projected light that has passed through the image rotation element IRE, can be viewed as... Figure 25 and Figure 26 The image at the second position P2 is rotated. That is, based on the image as a cross-section of the projected light, the image at the first position P1 and the image at the second position P2 can be different from each other. Furthermore, compared to the image at the first position P1, the image at the second position P2 can be rotated by a predetermined angle. Thus, with... Figure 28 In contrast, the projected light passing through the image rotation element IRE can rotate 90° around its direction of travel (e.g., a second direction (Y-axis direction)). Figure 29 As shown. Figure 30 As shown, with Figure 28 In contrast, the projected light passing through the image rotation element IRE can remain unrotated by a predetermined angle, but the ratio of the vertical length La to the horizontal length Lb of the image at the second position P2 can vary compared to the ratio of the vertical length La to the horizontal length Lb of the image at the first position P1, such as... Figure 30 As shown. (For example, at the first position P1, the vertical length La can be greater than or equal to the horizontal length Lb, while at the second position P2, the vertical length La can be shorter than the horizontal length Lb. At the second position P2, the ratio of the vertical length La to the horizontal length Lb can be 3:4 or 10:12).

[0380] also, Figure 29 and Figure 30An image can be formed on diffraction element 312 after the light projected by the projector is rotated or its ratio is changed by the IRE. Figure 30 The image is visible to the user's eye after the light projected by the projector is diffracted by the IRE through diffraction elements 312, 313 and 314.

[0381] As described above, the image rotation element (IRE) may include a Dove prism. Furthermore, the image rotation element (IRE) may have an isosceles trapezoidal cross-sectional shape parallel to the longitudinal direction.

[0382] Furthermore, the longitudinal direction of the image rotation element IRE and the projection device 200 can be parallel to the direction of travel of the projection light (e.g., a second direction or the Y-axis direction). Additionally, as... Figure 27 As shown, the image rotation element IRE can be configured such that the vertical axis AV forms a first angle with the long axis LA of the projection light incident on the image rotation element IRE. In this case, when the viewing direction DEH rotates counterclockwise, the first angle can be represented as "θb" (for counterclockwise rotation) or "θc" (for clockwise rotation), as... Figure 27 As shown. For example, the first angle θa can be 45°. In this case, in order to form the first angle θa, the image rotation element IRE can rotate clockwise or counterclockwise relative to the major axis LA of the projection light about the second direction or the Y-axis.

[0383] In this type of structure, the projected light incident on the image rotation element IRE can rotate by twice the first angle θa around the longitudinal direction (second direction) of the image rotation element IRE as it passes through the IRE. For example, when the first angle θa is 45°, the projected light incident on the image rotation element IRE can rotate 90° around the longitudinal direction of the Dove prism. Furthermore, the projected light can be vertically reversed as it passes through the image rotation element IRE.

[0384] More specifically, such as Figure 28 As shown, the upper left region of the image SS, which is the cross-section of the projected light at the first position P1, can be the first region AR1. In this case, when Figure 28 When the projected light at the first position P1 shown passes through the image rotation element IRE, the image can rotate 90° around the direction of travel of the projected light (e.g., the second direction or the Y-axis direction). Therefore, as Figure 29 As shown, the first region AR1 can be moved to the lower right (or lower left) side, as in the image SS, which is the cross-section of the projected light at the second position P2. In this way, the shape of the image SS, which is the cross-section of the projected light, can be rotated by 90° when passing through the image rotation element IRE.

[0385] Furthermore, an additional lens can be positioned at the rear end of the image rotation element IRE to adjust the size of the image as a cross-section of the projected light.

[0386] Furthermore, according to the embodiment, as the angle formed between the length and height of the projection device 200 increases, the angle formed by the length and height of the image rotation element IRE (i.e., the aforementioned first angle) can also increase. Table 10 below shows the first angle of the image rotation element corresponding to the angle of the projection device according to the embodiment.

[0387] [Table 10]

[0388] Here, the angle of the projection device (DLP) can refer to the angle (less than or equal to 90°) formed between the projection device and a plane perpendicular to the second axis AX2 or the first axis AX1. Figure 24 As shown. For example, in Figure 23 and Figure 24 In this projection device, the angle can be 0°. Furthermore, the first axis AX1 can be parallel to an axis extending from the left eye to the right eye, or in a opposite direction. Additionally, the first axis AX1 can correspond to the width direction of the projection device. The second axis AX2 is perpendicular to the first axis AX1 and can correspond to the height direction of the projection device 200. Furthermore, both the first axis AX1 and the second axis AX2 can be perpendicular to the longitudinal direction or the light emission direction. Therefore, the first axis AX1 can be perpendicular to the light emission direction from the projection device. Furthermore, the second axis AX2 can be perpendicular to the light emission direction from the projection device. (Reference) Figure 24 , Figure 25 As shown in Table 1, the angle formed by the height H1 of the projection device or projector 200 according to the embodiment and the cross section perpendicular to the first axis may be different from the angle formed between the height H2 of the image rotation element IRE and the cross section perpendicular to the first axis. For example, when the angle formed by the height H1 of the projection device or projector 200 and the cross section perpendicular to the first axis (corresponding to the angle of the projection device) is 0°, the angle formed by the height H2 of the image rotation element IRE and the cross section perpendicular to the first axis (corresponding to the first angle) may be 45°.

[0389] Furthermore, the size of the image rotation element IRE can vary according to the angle formed between the height H1 of the projection device or projector 200 and the cross-section perpendicular to the first axis (corresponding to the angle of the projection device). For example, as the angle formed between the height H1 of the projection device or projector 200 and the cross-section perpendicular to the first axis increases, the size of the image rotation element IRE can increase. When the angle formed by the height H1 of the projection device or projector 200 and the cross-section perpendicular to the first axis (corresponding to the angle of the projection device) is 30°, the size of the image rotation element IRE can be 3.2*3.2*7 (height*width*length), and this size can vary within ±10%. In this case, when the angle formed by the height H1 of the projection device or projector 200 and the cross-section perpendicular to the first axis (corresponding to the angle of the projection device) increases to 50°, the size of the image rotation element IRE can increase to 5.3*5.3*11.7 (height*width*length), and this size can also vary within ±10%.

[0390] The features, structures, effects, etc., described in the above embodiments are included in at least one embodiment, but are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, etc., shown in each embodiment can be combined or modified by those skilled in the art for other embodiments. Therefore, content related to such combinations and modifications should be interpreted as being included within the scope of the embodiments.

[0391] Although embodiments have been described above, they are merely examples and are not intended to limit the invention. It will be apparent to those skilled in the art that various modifications and applications not described above can be made without departing from the essential characteristics of the embodiments. For example, modifications can be made to each component specifically shown in the embodiments. Furthermore, it should be understood that differences associated with such changes and applications are included within the scope of the embodiments defined in the appended claims.

Claims

1. An electronic device comprising: Projector; A light guide device is configured to guide light emitted from a projector; as well as An image rotation element is disposed between the projector and the light guide device. The image rotation element causes the light emitted from the projector to rotate around the longitudinal direction of the image rotation element.

2. The electronic device according to claim 1, wherein, The image rotation element is configured to be adjacent to the projector and spaced a first distance from the projector.

3. The electronic device according to claim 1, wherein, The image rotation element is configured to be spaced a second distance from the light guide device.

4. The electronic device according to claim 1, wherein, The direction of light emitted from the projector is parallel to the longitudinal direction of the image rotation element.

5. The electronic device according to claim 1, wherein, As the angle between the length and height of the projector increases, the angle between the length and height of the image rotation element also increases.

6. The electronic device according to claim 1, wherein, The angle formed between the height of the projector and the cross section perpendicular to the first axis is different from the angle formed between the height of the image rotating element and the cross section perpendicular to the first axis.

7. The electronic device according to claim 1, wherein, When the angle between the height of the projector and the cross section perpendicular to the first axis is 0°, the angle between the height of the image rotation element and the cross section perpendicular to the first axis is 45°.

8. The electronic device according to claim 1, wherein, The optical apertures of the projector and the image rotation element are located at the inner coupler of the light guide device.

9. The electronic device according to claim 1, wherein, The width of the image rotation element is less than the length of the image rotation element.

10. The electronic device according to claim 1, wherein, The projector, the image rotating element, and the light guide device overlap each other in the longitudinal direction.

Images