Projector and electronic device including same

Abstract

According to an embodiment disclosed herein, a projector comprises: a light source unit including a light source that emits light; a first lens assembly including a first lens unit; a second lens assembly including a second lens unit; and a light modulator that modulates and reflects the light, wherein the optical axis direction of the second lens unit is arranged in a first direction, and the light source, the first lens assembly, and the light modulator overlap in a second direction perpendicular to the upper surface of the light modulator.

Description

Projection device and electronic device including the same

[0001] The embodiments relate to a project device and an electronic device including the same.

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

[0003] Augmented Reality (AR) refers to a technology that superimposes virtual objects or information onto a real environment to make them appear as if they exist in the original environment.

[0004] Mixed Reality (MR) or Hybrid Reality refers to the creation of new environments or new information by combining the virtual world and the real world. In particular, it is called Mixed Reality when referring to the ability to interact in real time between things existing in the real world and the virtual world.

[0005] In this case, the created virtual environment or situation stimulates the user's five senses and enables spatial and temporal experiences similar to reality, thereby allowing the user to freely cross the boundary between reality and imagination. Furthermore, the user can not only simply immerse themselves in this environment but also interact with the elements implemented within it, such as by using actual devices to perform operations or issue commands.

[0006] Recently, active research is being conducted on equipment (gear, devices) used in these technological fields. However, there is a growing need for miniaturization and improvement of optical performance for such equipment.

[0007] The embodiment provides a projection device and an electronic device that are miniaturized and compacted by adjusting the positions of a light source, a mirror, a lens, a prism, a light modulator, and the projection device when using a projection device used for AR (Augmented Reality), etc. and an electronic device including the same.

[0008] In addition, it provides project devices and electronic devices with reduced volume through the adjustment of the housing shape.

[0009] In addition, it provides a projector device and an electronic device with improved optical performance by enhancing light-gathering power and light-gathering accuracy.

[0010] The problem to be solved in the embodiments is not limited thereto, and may also include the purpose or effect that can be identified from the means of solving the problem or the form of implementation described below.

[0011] A project device according to an embodiment comprises: a housing including a first aperture; a light source unit including a light source that irradiates light; a first lens assembly including a first lens unit; a second lens assembly including a second lens unit; and a light modulator that modulates and reflects the light, wherein the optical axis of the second lens unit is arranged in a first direction, and the second lens assembly may be arranged in the first aperture formed in the housing.

[0012] The above housing includes a first side perpendicular to the first direction, and the first aperture may be positioned on the first side.

[0013] The first aperture includes a first outer surface located on the inner side of the first side and a second outer surface located on the outer side of the first side, and the area of ​​the first outer surface may be smaller than the area of ​​the second outer surface.

[0014] The first outer surface includes a first outer line and a second outer line, the first outer line includes a straight line shape, and the second outer line may include a curved shape.

[0015] The above housing includes an upper surface on which the first lens assembly is disposed, and the first outline may be adjacent to the upper surface of the housing and arranged parallel to the upper surface.

[0016] The first aperture is spaced apart from the upper surface of the housing in a second direction perpendicular to the first direction and perpendicular to the upper surface of the optical modulator, and the first outline may extend in a third direction perpendicular to the first direction and the second direction.

[0017] The above housing includes a first bevel surface and a second bevel surface disposed between the first outer surface and the second outer surface, and the first bevel surface is adjacent to the first outer line and may include a rectangular shape.

[0018] It includes a prism disposed between the first lens assembly and the light modulator, wherein the prism may include a region that overlaps with the first aperture in the first direction and a region that does not overlap with the first aperture in the first direction.

[0019] The width in the second direction, which is perpendicular to the first direction of the prism and perpendicular to the upper surface of the light modulator, may be greater than the width in the second direction of the first aperture.

[0020] The first lens part, the prism, and the second lens part can be overlapped in the first direction.

[0021] The second lens portion includes a second retainer disposed adjacent to the first aperture, and the area of ​​the outer surface of the second retainer may be larger than the area of ​​the second outer surface of the first aperture.

[0022] The second retainer may include a first retainer groove and a second retainer groove having a certain width in a second direction perpendicular to the first direction.

[0023] The first retainer groove and the second retainer groove may be spaced apart in a third direction perpendicular to the first direction and the second direction.

[0024] The second lens assembly includes a second lens barrel in which the second lens portion is disposed on the inside, and the first retainer groove and the second retainer groove may overlap with the second lens barrel in the third direction.

[0025] The second retainer may be spaced a certain distance apart from the first side of the housing and in the first direction.

[0026] The second lens portion includes a second-1 lens adjacent to the second retainer, and the second retainer and the second-1 lens may overlap the optical modulator and a second direction perpendicular to the first direction.

[0027] A project device according to an embodiment comprises: a light source unit including a light source that irradiates light; a first lens assembly including a first lens unit; a second lens assembly including a second lens unit; and a light modulator that modulates and reflects the light; wherein the optical axis direction of the second lens unit is arranged in a first direction, and the light source, the first lens assembly, and the light modulator may be superimposed in a second direction perpendicular to the upper surface of the light modulator.

[0028] The first lens assembly may include a holder coupled to the light source and a first lens barrel coupled to the holder and having the first lens portion disposed on its inner side.

[0029] The upper surface of the holder may have the first direction and the first angle and be positioned perpendicular to the direction in which the light source irradiates light.

[0030] The upper surface of the holder may be positioned perpendicular to the optical axis of the first lens portion of the first lens assembly.

[0031] The lower surface of the holder is positioned perpendicular to the second direction, and the holder may include a first to third protrusion positioned on the lower surface of the holder.

[0032] The width of the holder in the second direction may increase as it moves away from the second lens assembly in the first direction.

[0033] A project device according to an embodiment includes a housing coupled to the light source and the holder, and the housing may include first to third grooves coupled to the first to third protrusions, respectively.

[0034] The first protrusion is positioned adjacent to the second lens assembly, the second protrusion is positioned spaced apart from the first protrusion in the first direction, and the second protrusion and the third protrusion may be spaced apart in a third direction perpendicular to the first direction and the second direction.

[0035] The width of the first protrusion in the first direction may be smaller than the width of the second protrusion and the third protrusion in the first direction.

[0036] The area of ​​the first side of the holder adjacent to the second lens assembly is smaller than the area of ​​the second side of the holder spaced apart from the second lens assembly, and the first side and the second side of the holder can be positioned perpendicular to the upper surface of the holder.

[0037] The first lens barrel includes a plurality of sides, and the plurality of sides of the first lens barrel may be arranged in the second direction.

[0038] The first lens barrel includes a first barrel side through a sixth barrel side, and the first barrel side is positioned adjacent to the second lens assembly and may include a curved shape.

[0039] The second barrel side and the third barrel side are positioned adjacent to the first barrel side, and the second barrel side and the third barrel side have a planar shape and can be positioned side by side with each other.

[0040] The second barrel side and the third barrel side are arranged to be connected to the first barrel side, and the second barrel side and the third barrel side have a planar shape and can be arranged parallel to each other.

[0041] The fourth barrel side is positioned adjacent to the second barrel side and includes a curved shape, and the fifth barrel side is positioned adjacent to the third barrel side and may include a flat shape.

[0042] The sixth barrel side is positioned between the fourth barrel side and the fifth barrel side and may include a planar shape.

[0043] The first barrel includes a first barrel bottom surface and a second barrel bottom surface, the first barrel bottom surface is positioned parallel to the upper surface of the holder, and the second barrel bottom surface may be positioned between the first barrel bottom surface and the first barrel side surface to the sixth barrel side surface.

[0044] A project device according to an embodiment includes a prism disposed between the first lens assembly and the light modulator, and the first barrel bottom surface and the second barrel bottom surface may partially overlap with the prism in the first direction.

[0045] The first lens barrel includes a first inner surface that contacts the first lens portion, and the first inner surface may be positioned perpendicular to the upper surface of the holder.

[0046] A portion of the upper surface of the prism and a portion of the lower surface of the second barrel can be arranged parallel to each other.

[0047] The first angle above may be 5˚ to 7˚.

[0048] According to an embodiment, when using a projection device used for AR (Augmented Reality), etc., and an electronic device including the same, a projection device and an electronic device can be provided that are miniaturized and compacted by adjusting the positions of a light source, a mirror, a lens, a prism, a light modulator, and a projection device.

[0049] In addition, project devices and electronic devices with reduced volume can be provided by adjusting the shape of the housing.

[0050] In addition, it is possible to provide projector devices and electronic devices with improved optical performance by enhancing light-gathering power and light-gathering accuracy.

[0051] The various and beneficial advantages and effects of the present invention are not limited to those described above and may be more easily understood in the process of explaining specific embodiments of the present invention.

[0052] FIG. 1 is a block diagram showing the configuration of an augmented reality electronic device according to an embodiment of the present invention, and

[0053] FIG. 2 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention, and

[0054] FIG. 3 is a perspective view of a project device according to an embodiment of the present invention, and

[0055] FIG. 4 is a side view of a project device according to an embodiment of the present invention, and

[0056] FIG. 5 is another perspective view of a project device according to an embodiment of the present invention, and

[0057] FIG. 6 is an exploded perspective view of a project device according to an embodiment of the present invention, and

[0058] FIG. 7 is a cross-sectional view taken by cutting along AA' in FIG. 3, and

[0059] FIG. 8 is a perspective view of a housing of a project device according to an embodiment of the present invention, and

[0060] FIG. 9 is a front view of a housing of a project device according to an embodiment of the present invention, and

[0061] FIG. 10 is a top view of a housing of a project device according to an embodiment of the present invention, and

[0062] FIG. 11 is a bottom view of a housing of a project device according to an embodiment of the present invention, and

[0063] FIG. 12 is a rear view of the housing of a project device according to an embodiment of the present invention, and

[0064] FIG. 13 is a partial enlarged view of FIG. 8, and

[0065] FIG. 14 is a cross-sectional view of a housing of a project device according to an embodiment of the present invention, and

[0066] FIG. 15 is a side view of a project device according to an embodiment of the present invention, excluding the housing, and

[0067] FIG. 16 is a perspective view showing the light source unit and the first lens assembly of a project device combined according to an embodiment of the present invention, and

[0068] FIG. 17 is a cross-sectional view taken by cutting along BB' in FIG. 16, and

[0069] FIG. 18 is a perspective view showing the holder and the first lens barrel of a project device combined according to an embodiment of the present invention, and

[0070] FIG. 19 is a side view showing the holder and the first lens barrel of a project device combined according to an embodiment of the present invention, and

[0071] FIG. 20 is a bottom view showing the holder and the first lens barrel of a project device combined according to an embodiment of the present invention, and

[0072] FIG. 21 is a perspective view of a second lens assembly and a prism of a project device according to an embodiment of the present invention, and

[0073] FIG. 22 is a cross-sectional view taken by cutting along CC' in FIG. 19, and

[0074] FIG. 23 is a perspective view of a second lens portion according to an embodiment of the present invention, and

[0075] FIG. 24 is a rear view of a second lens portion according to an embodiment of the present invention, and

[0076] FIG. 25 is a perspective view showing the optical modulator and substrate portion of a project device combined according to an embodiment of the present invention, and

[0077] Fig. 26 is a partial enlarged view of Fig. 7.

[0078] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0079] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0080] In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0081] Furthermore, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0082] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0083] In addition, terms such as first, second, A, B, (a), (b), etc. may be used when describing the components of the embodiments of the present invention.

[0084] These terms are intended merely to distinguish a component from other components and are not limited by the nature, order, sequence, etc., of the said component.

[0085] And, where it is stated that a component is 'connected', 'combined', or 'joined' to another component, this may include not only cases where the component is directly connected, combined, or joined to the other component, but also cases where it is 'connected', 'combined', or 'joined' due to another component located between the component and the other component.

[0086] Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0087] FIG. 1 is a block diagram showing the configuration of an extended reality electronic device according to an embodiment of the present invention.

[0088] Referring to FIG. 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), and a power supply unit (28). Since the components illustrated in FIG. 1 are not essential for implementing the electronic device (20), the electronic device (20) described herein may have more or fewer components than those listed above.

[0089] More specifically, among the above 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. Additionally, the wireless communication unit (21) may include one or more modules that connect the electronic device (20) to one or more networks.

[0090] This wireless communication unit (21) may include at least one of a broadcast reception module, a mobile communication module, a wireless internet module, a short-range communication module, and a location information module.

[0091] The input unit (22) may include a camera or video input unit for inputting a video signal, a microphone or audio input unit for inputting an audio signal, and a user input unit for receiving information from a user (e.g., a touch key, a mechanical key, etc.). Voice data or image data collected from the input unit (22) may be analyzed and processed into a user's control command.

[0092] The sensing unit (23) may include one or more sensors for sensing at least one of information within the electronic device (20), information about the surrounding environment surrounding the electronic device (20), and user information.

[0093] For example, the sensing unit (23) may include at least one of a proximity sensor, an illumination sensor, a touch sensor, an acceleration sensor, a magnetic sensor, a gravity sensor (G-sensor), a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor (IR sensor: infrared sensor), a fingerprint sensor (finger scan sensor), an ultrasonic sensor, an optical sensor (e.g., a shooting means), a microphone, a battery gauge, an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, a radiation detection sensor, a heat detection sensor, a gas detection sensor, etc.), and a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the electronic device (20) disclosed in this specification may utilize information sensed from at least two of these sensors in combination.

[0094] The output unit (24) is intended to generate output related to sight, hearing, or touch, and may include at least one of a display unit, an audio output unit, a haptic module, and an optical output unit. The display unit may form a layered structure with a touch sensor or be formed integrally to implement a touch screen. Such a touch screen functions as a user input means that provides an input interface between the augmented reality electronic device (20) and the user, and at the same time can provide an output interface between the augmented reality electronic device (20) and the user.

[0095] The interface section (25) serves as a channel for various types of external devices connected to the electronic device (20). Through the interface section (25), the electronic device (20) can receive virtual reality or augmented reality content from external devices and can perform mutual interaction by exchanging various input signals, sensing signals, and data.

[0096] For example, the interface section (25) may include at least one of a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio I / O (Input / Output) port, a video I / O (Input / Output) port, and an earphone port.

[0097] Additionally, the memory (26) stores data that supports various functions of the electronic device (20). The memory (26) can store a number of applications (application programs or applications) running on the electronic device (20), data for the operation of the electronic device (20), and instructions. At least some of these applications may be downloaded from an external server via wireless communication. Additionally, at least some of these applications may exist on the electronic device (20) from the time of shipment for the basic functions of the electronic device (20) (e.g., phone incoming and outgoing functions, message receiving and sending functions).

[0098] 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. that are input or output through the components described above.

[0099] Additionally, the control unit (27) can control at least some of the components by running an application program stored in the memory (26) to provide appropriate information to the user or process functions. Furthermore, the control unit (27) can operate at least two or more of the components included in the electronic device (20) in combination with each other to run the application program.

[0100] Additionally, the control unit (27) can detect the movement of the electronic device (20) or the user by using a gyroscope sensor, gravity sensor, motion sensor, etc. included in the sensing unit (23). Alternatively, the control unit (27) can detect an object approaching the electronic device (20) or the user by using a proximity sensor, light sensor, magnetic sensor, infrared sensor, ultrasonic sensor, light sensor, etc. included in the sensing unit (23). Furthermore, the control unit (27) can also detect the user's movement through sensors provided in a controller that operates in conjunction with the electronic device (20).

[0101] Additionally, the control unit (27) can perform the operation (or function) of the electronic device (20) using an application program stored in the memory (26).

[0102] The power supply unit (28) receives external power or internal power under the control of the control unit (27) and supplies power to each component included in the electronic device (20). The power supply unit (28) includes a battery, and the battery may be provided in a built-in or replaceable form.

[0103] At least some of the above components may operate in cooperation with each other to implement the operation, control, or control method of an electronic device according to various embodiments described below. Additionally, the operation, control, or control method of an electronic device may be implemented on the electronic device by running at least one application program stored in memory (26).

[0104] Hereinafter, the electronic device described as an example of the present invention is described based on an embodiment applied to a Head Mounted Display (HMD). However, embodiments of the electronic device according to the present invention may include mobile phones, smartphones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, slate PCs, tablet PCs, ultrabooks, and wearable devices. In addition to HMDs, wearable devices may include smartwatches, contact lenses, VR / AR / MR glasses, etc.

[0105] FIG. 2 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

[0106] As illustrated in FIG. 2, an electronic device according to an embodiment of the present invention may include a frame (100), a project device (200), and a display unit (300).

[0107] The electronic device may be provided as a glass type (smart glass). The glass type electronic device is configured to be wearable on the head of the human body, and may be provided with a frame (case, housing, etc.) (100) for this purpose. The frame (100) may be formed of a flexible material to facilitate wearing.

[0108] The frame (100) is supported on the head and provides a space for mounting various components. As illustrated, electronic components such as a projector (200), a user input unit (130), or an audio output unit (140) may be mounted on the frame (100). Additionally, a lens covering at least one of the left and right eyes may be detachably mounted on the frame (100).

[0109] As shown in the drawing, the frame (100) may have the form of glasses worn on the face of the user, but is not necessarily limited thereto and may have the form of goggles worn in close contact with the user's face.

[0110] Such a frame (100) may include a front frame (110) having at least one opening, and a pair of side frames (120) that extend in the y direction (in FIG. 2) intersecting the front frame (110) and are parallel to each other.

[0111] The frame (100) may have the same or different lengths in the x direction (DI) and the y direction (LI).

[0112] The projection device (200) is configured to control various electronic components equipped in an electronic device. The projection device (200) may be used interchangeably with 'light output device', 'light projection device', 'light irradiation device', 'optical device', etc.

[0113] The projection device (200) can generate an image or a continuous video of images that is displayed to the user. The projection device (200) may include an image source panel that generates an image and a plurality of lenses that diffuse and converge the light generated from the image source panel.

[0114] The project device (200) may be fixed to one of the two side frames (120). For example, the project device (200) may be fixed to the inside or outside of one of the side frames (120), or may be formed integrally by being embedded inside one of the side frames (120). Alternatively, the project device (200) may be fixed to the front frame (110) or provided separately from the electronic device.

[0115] The display unit (300) can be implemented in the form of a Head Mounted Display (HMD). An HMD form refers to a display method that is mounted on the head and displays an image directly in front of the user's eyes. In order to provide an image directly in front of the user's eyes when the user wears the electronic device, the display unit (300) may be positioned to correspond to at least one of the left eye and the right eye. In this drawing, the display unit (300) is exemplified as being located in the part corresponding to the right eye so as to output an image toward the user's right eye. However, as described above, it is not limited to this and may be positioned on both the left eye and the right eye.

[0116] The display unit (300) can allow the user to visually perceive the external environment while simultaneously displaying an image generated by the projection device (200) to the user. For example, the display unit (300) can project an image onto a display area using a prism.

[0117] And the display unit (300) may be formed to be transparent so that the projected image and the general field of view in front (the range the user looks at through their eyes) can be seen simultaneously. For example, the display unit (300) may be translucent and may be formed of an optical member including glass.

[0118] The display unit (300) may be inserted into and fixed to an opening included in the front frame (110), or positioned on the back of the opening [i.e., between the opening and the user] and fixed to the front frame (110). Although the drawing illustrates an example where the display unit (300) is positioned on the back of the opening and fixed to the front frame (110), the display unit (300) may be placed and fixed at various locations on the frame (100).

[0119] As shown in FIG. 2, when an image light for an image is incident on one side of a display unit (300) from a projection device (200), the image light is emitted through the display unit (300) to the other side, thereby allowing the image generated by the projection device (200) to be shown to the user.

[0120] Accordingly, the user can view the external environment through the opening of the frame (100) while simultaneously viewing the image generated by the projection device (200). That is, the image output through the display unit (300) can be seen overlapping with the normal field of view. The electronic device can utilize these display characteristics to provide Augmented Reality (AR), which overlays a virtual image onto a real-world image or background to display it as a single image.

[0121] Furthermore, in addition to this operation, an external environment and an image generated by the projection device (200) may be provided to the user with a time difference for a short period that is not perceived by the person. For example, within a single frame, the external environment may be provided to the person in one section, and an image from the projection device (200) may be provided to the person in another section.

[0122] Alternatively, both overlap and time difference may be provided.

[0123] In addition, the projection device according to the embodiment may have a structure described below, or may be formed with a structure further including a waveguide or / and glass in the structure. In addition, the projection device may include a Digital Light Processing (DLP) projector or a projection device.

[0124] FIG. 3 is a perspective view of a project device according to an embodiment of the present invention, FIG. 4 is a side view of a project device according to an embodiment of the present invention, FIG. 5 is another perspective view of a project device according to an embodiment of the present invention, FIG. 6 is an exploded perspective view of a project device according to an embodiment of the present invention, and FIG. 7 is a cross-sectional view taken by cutting along AA' in FIG. 3.

[0125] In the projection device according to the embodiment, the first direction may correspond to the 'X-axis direction' in the drawing. The first direction may correspond to the optical axis direction of the second lens unit (L2). Alternatively, the first direction may correspond to the direction in which the optical modulator (260) is placed. Furthermore, the second direction may correspond to the Z-axis direction in the drawing. The second direction may be a direction perpendicular to the first direction. The third direction may be a direction perpendicular to the first direction and the second direction. And the third direction may correspond to the 'Y-axis direction' in the drawing.

[0126] Referring to FIGS. 3 to 7, a project device (200) according to an embodiment may include a housing (210), a light source unit (220), a first lens assembly (230), a second lens assembly (240), a prism (250), a light modulator (260), and a substrate unit (270).

[0127] FIG. 8 is a perspective view of a housing of a project device according to an embodiment of the present invention, FIG. 9 is a front view of a housing of a project device according to an embodiment of the present invention, FIG. 10 is a top view of a housing of a project device according to an embodiment of the present invention, FIG. 11 is a bottom view of a housing of a project device according to an embodiment of the present invention, and FIG. 12 is a rear view of a housing of a project device according to an embodiment of the present invention.

[0128] Referring to FIGS. 3 through 12, a project device (200) according to an embodiment may include a housing (210). The housing (210) may have a space in which each component of the project device (200) is accommodated or placed. The housing (210) may be located on the outside of the project device (200) to protect other components, or may be combined with other components of the project device (200) to fix and support other components. For example, a first lens assembly (230), a prism (250), and a light modulator (260) may be placed on the inside of the housing (210). Additionally, a light source unit (220), a second lens assembly (240), and a substrate unit (270) may be placed on the outside of the housing (210).

[0129] The housing (210) may be distinguished into a first part (211) in which a first lens assembly (230) and a prism (250) are placed, and a second part (212) in which a light modulator (260) is placed. The first part (211) may be placed on top of the second part (212). The width in the first direction of the first part (211) may be smaller than the width in the first direction of the second part (212). Additionally, the width in the second direction of the first part (211) may be larger than the width in the second direction of the second part (212). The width in the third direction of the first part (211) may be equal to the width in the third direction of the second part (212). When viewed in the second direction, the center of the first part (211) and the center of the second part (212) may not coincide. When viewed from the second direction, the center of the first part (211) may be spaced a certain distance from the center of the second part (212) in the first direction. That is, the center of the first part (211) may be positioned close to one side of the second part (212).

[0130] A light source unit (220) may be disposed on the upper surface (S1) of the first part (211). The upper surface (S1) of the first part (211) may include a hole into which the light source unit (220) is disposed and light irradiated by the light source (221) is incident. Additionally, a holder (231) of the first lens assembly (230) may be disposed on the upper surface (S1) of the first part (211). The upper surface (S1) of the first part (211) may include a plurality of grooves into which a plurality of protrusions of the holder (231) are disposed. The upper surface (S1) of the first part (211) may include first to third grooves (h1, h2, h3). The first to third grooves (h1, h2, h3) can each be coupled with the first to third protrusions (231a, 231b, 231c) of the holder (231). The first to third grooves (h1, h2, h3) can be placed at the corner portions of the upper surface (S1) of the first part (211). The first to third grooves (h1, h2, h3) can be placed spaced apart from each other. The first groove (h1) can be placed at the corner adjacent to the first aperture (a1) of the upper surface (S1) of the first part (211). The second groove (h2) and the third groove (h3) can be placed at the corner spaced apart from the first aperture (a1) of the upper surface (S1).

[0131] A second lens assembly (240) may be disposed on the first side (S2) of the first part (211). The first side (S2) of the first part (211) may include a first aperture (a1). Light reflected from the prism (250) may reach the second lens portion (242) of the second lens assembly (240) through the first aperture (a1). The first aperture (a1) may be disposed to overlap with the prism (250) and the second lens assembly (240) in a first direction. The first aperture (a1) may overlap with a part of the prism (250) in a first direction. The first aperture (a1) may overlap with the first lens portion (233) in a first direction. Additionally, the first aperture (a1) may overlap with the light modulator (260) in a second direction. The first aperture (a1) may include a D-cut structure. The first aperture (a1) may include a D-cut structure to minimize the area that does not overlap with the prism (250) in the first direction. The first aperture (a1) may include a D-cut structure to prevent light from entering the interior of the housing (210) from the outside through the space where the prism (250) is not placed. Accordingly, it is possible to prevent unnecessary light from being reflected by the prism (250) and incident on the light modulator (260), and to improve the optical performance of the projection device (200).

[0132] A light modulator (260) may be disposed in the second part (212). The light modulator (260) may be disposed in a hole inside the second part (212). The lower surface (S3) of the second part (212) may be in contact with the substrate portion (270). The lower surface (S3) of the second part (212) may be in contact with the substrate portion (270) and may include a hole so that the light modulator (260) disposed on the substrate portion (270) may be disposed inside the second part (212). The light modulator (260) may be disposed so as to partially overlap with the second lens assembly (240) in the second direction. The light modulator (260) may be disposed so as to partially overlap with the prism, the first lens assembly (230), and the light source (221) in the second direction.

[0133] Additionally, the second part (212) may include a second aperture (a2). The second aperture (a2) may be positioned between the second part (212) and the first part (211) of the housing (210). That is, the second aperture (a2) may be positioned on the upper surface of the second part (212). Light reflected from the prism (250) through the second aperture (a2) may be incident on the light modulator (260), or light reflected from the light modulator (260) may be incident on the prism (250). The second aperture (a2) may be positioned to overlap with the prism (250) and the light modulator (260) in a second direction. Additionally, the second aperture (a2) may not overlap with the optical axis of the first lens part (233). That is, the extension of the optical axis of the first lens portion (233) may not pass through the second aperture (a2). The second aperture (a2) may include an area that overlaps with the mirror portion (261) of the optical modulator (260) in the second direction and an area that does not overlap. The width of the second aperture (a2) in the first direction may be smaller than the width of the prism (250) in the first direction.

[0134] The second part (212) may include a protruding structure (212a). The protruding structure (212a) may come into contact with the substrate part (270). The protruding structure (212a) may come into contact with the second sub-substrate (272) of the substrate part (270). The substrate part (270) may be stably coupled to the housing (210) by means of the protruding structure (212a). The protruding structure (212a) may include a recess on the inside. The second part (212) may include a plurality of protrusions (212b). The plurality of protrusions (212b) may be spaced apart in a third direction. Through the plurality of protrusions (212b), the light source substrate (222) of the light source part (220) may be stably coupled to the housing (210).

[0135] FIG. 13 is a partial enlarged view of FIG. 8, and FIG. 14 is a cross-sectional view of the housing of a project device according to an embodiment.

[0136] Referring to FIGS. 3 through 14, the first aperture (a1) of the housing (210) may include a first outer surface (a1-1) and a second outer surface (a1-2). The first outer surface (a1-1) may be a surface positioned on the inner side of the first side (S2) of the housing (210). The first outer surface (a1-1) may be positioned adjacent to the prism (250). Additionally, the second outer surface (a1-2) may be a surface positioned on the outer side of the first side (S2) of the housing (210). The first outer surface (a1-1) and the second outer surface (a1-2) may be positioned perpendicular to the first direction. The first aperture (a1) may have a width in the first direction equal to the distance in the first direction between the first outer surface (a1-1) and the second outer surface (a1-2). The area of ​​the first outer surface (a1-1) may be smaller than the area of ​​the second outer surface (a1-2). The distance in the first direction between the second lens assembly (240) and the first outer surface (a1-1) may be greater than the distance in the first direction between the second lens assembly (240) and the second outer surface (a1-2). By including the first outer surface (a1-1) and the second outer surface (a1-2) in the first aperture (a1), the prism (250) and the second lens assembly (240) can be stably positioned on the inner and outer sides of the first side (S2) of the housing (210). That is, the second lens assembly (240) can be stably positioned around the first aperture (a1), while simultaneously preventing external light from entering the prism (250) through the first aperture (a1).

[0137] The first outer surface (a1-1) may include a first outline (l1) and a second outline (l2). The first outline (l1) may be positioned adjacent to the upper surface (S1) of the housing (210). The first outline (l1) may include a straight line shape. The first outline (l1) may be positioned parallel to or parallel to the upper surface (S1) of the housing (210). The first outline (l1) may be positioned in a third direction. The second outline (l2) may include a curved shape. The second outline (l2) may be positioned at the bottom of the first outline (l1).

[0138] The second outer surface (a1-2) may include a third outer line (l3) and a fourth outer line (l4). The third outer line (l3) may be positioned adjacent to the upper surface (S1) of the housing (210). The third outer line (l3) may include a straight line shape. The third outer line (l3) may be positioned parallel to the upper surface (S1) of the housing (210). The third outer line (l3) may be positioned in a third direction. The fourth outer line (l4) may include a curved shape. The fourth outer line (l4) may be positioned at the bottom of the third outer line (l3).

[0139] The first outline (l1) and the third outline (l3) may include a straight line shape, so that the first aperture (a1) may include a D-cut structure, and accordingly, light can be prevented from entering the interior of the housing (210) from the outside through the space where the prism (250) is not placed. Thus, it is possible to prevent unnecessary light from being reflected by the prism (250) and incident on the light modulator (260), and to improve the optical performance of the projection device (200). Additionally, the second outline (l2) and the fourth outline (l4) may include a curved shape, thereby forming a structure in which the second lens barrel (241) of the second lens assembly (240) can be stably placed on the first side (S2) of the housing (210).

[0140] The first outline (l1) and the third outline (l3) may be arranged adjacently. The first outline (l1) and the third outline (l3) may be arranged parallel to each other. The lengths of the first outline (l1) and the third outline (l3) in the third direction may be the same. The second outline (l2) and the fourth outline (l4) may be arranged adjacently. When viewed in the first direction, the fourth outline (l4) may be placed outside the second outline (l2). The length of the fourth outline (l4) may be longer than the length of the second outline (l2).

[0141] The housing (210) may include a first bevel surface (c1) and a second bevel surface (c2) positioned between a first outer surface (a1-1) and a second outer surface (a1-2). The first bevel surface (c1) may be positioned between a first outer line (l1) and a third outer line (l3). The second bevel surface (c2) may be positioned between a second outer line (l2) and a fourth outer line (l4). The first bevel surface (c1) and the second bevel surface (c2) may have a certain angle with respect to the first side surface (S2) of the housing (210). The first bevel surface (c1) may include a rectangular shape.

[0142] FIG. 15 is a side view of a projector device according to an embodiment of the present invention excluding the housing, FIG. 16 is a perspective view showing the light source unit and the first lens assembly combined according to an embodiment of the present invention, and FIG. 17 is a cross-sectional view taken by cutting through FIG. 16 at BB'.

[0143] Referring to FIGS. 3 to 7 and FIGS. 15 to 17, a project device (200) according to an embodiment may include a light source unit (220) and a first lens assembly (230). The light source unit (220) and the first lens assembly (230) may be referred to as an illumination system together with a prism (250). The illumination system may serve to inject light into a light modulator (260). The light source unit (220) and the first lens assembly (230) may be combined. The first lens assembly (230) may be combined with the light source unit (220) in the direction in which light is irradiated to change the path of the light.

[0144] The light source unit (220) can irradiate light. The light source unit (220) may include at least one light source. The light source unit (220) may irradiate light of a plurality of wavelength bands. The light source unit (220) may be disposed on the outside of the housing (210). The light source unit (220) may be coupled with the first lens assembly (230), the housing (210), and the substrate unit (270) on the outside of the housing (210). The light source unit (220) may include a light source (221) that irradiates light. The light source (221) may include an LED. The light source (221) may be disposed on a light source substrate (222). The direction in which the light source (221) of the light source unit (220) irradiates light may be referred to as the fourth direction. The fourth direction may be different from the second direction. The light source (221) can be positioned to face the light modulator (260). The light source (221) can be positioned to overlap with the light modulator (260) in a second direction. Additionally, the light source (221) can be positioned to overlap with the prism (250) in a second direction. By positioning the light source (221) of the light source unit (220) to face the light modulator (260) and the prism (250) in a second direction so as to overlap, the light source (221) can be positioned close to the light modulator (260) and the prism (250), and the light path can be formed short. Accordingly, the configuration of the lighting system can be simplified, and the projector device (200) can be miniaturized.

[0145] Additionally, the light source unit (220) may include a light source substrate (222) coupled to the first lens assembly (230) and the substrate unit (270). The light source substrate (222) may include a first sub-light source substrate (222a) coupled to the first lens assembly (230) and a second sub-light source substrate (222b) coupled to the substrate unit (270). A connecting portion may be disposed between the first sub-light source substrate (222a) and the second sub-light source substrate (222b). The first sub-light source substrate (222a) and the second sub-light source substrate (222b) may form a certain angle. The first sub-light source substrate (222a) may form a certain angle with the first direction. The first sub-light source substrate (222a) may be disposed in a direction perpendicular to the fourth direction in which the light source (221) irradiates light. The second sub-light source substrate (222b) may be positioned in a second direction. The light source (221) may be positioned on the first sub-light source substrate (222a) of the light source substrate (222). The light source (221) may be positioned on the first sub-light source substrate (222a) to irradiate light into the interior of the housing (210). The second sub-light source substrate (222b) may be positioned between the housing (210) and the substrate portion (270). The second sub-light source substrate (222b) may be coupled between the first portion (211) of the housing (210) and the second sub-substrate (272). Additionally, the light source substrate (222) may include a stiffener, solder, circuit components, etc., for operation and coupling of the light source (221).

[0146] The first lens assembly (230) can change the path of light irradiated by the light source unit (220). Light passing through the first lens assembly (230) can reach the prism (250). The first lens assembly (230) can be coupled with the light source unit (220). The first lens assembly (230) can be coupled with the first sub-light source substrate (222a) of the light source unit (220). The first lens assembly (230) can overlap with the prism (250) and the light modulator (260) in a second direction. Additionally, the first lens assembly (230) can partially overlap with the second lens assembly (240) in a first direction. The first lens assembly (230) may include a holder (231), a first lens barrel (232), and a first lens unit (233).

[0147] The holder (231) can be coupled with the light source substrate (222) to fix the first lens barrel (232) and the first lens part (233). The holder (231) can be positioned between the first sub-light source substrate (222a) and the first lens barrel (232). Additionally, the holder (231) can be coupled with the housing (210). The holder (231) can be positioned on the upper surface of the housing (210). The first lens barrel (232) can be coupled with the holder (231) to support the lens. The first lens barrel (232) can be positioned at the bottom of the holder (231). The first lens part (233) can be positioned inside the first lens barrel (232). The holder (231) and the first lens barrel (232) may include a hole through which the first lens part (233) is positioned and light can pass. The holder (231) can be superimposed on the light source (221) in a direction perpendicular to the fourth direction. That is, the light source (221) can be placed inside the hole of the holder (231). By placing the light source (221) inside the holder (231) of the first lens assembly (230), the size of the lighting system can be reduced. Additionally, the light source part (220) and the first lens part (233) can be combined through the holder (231), thereby reducing the size of the lighting system while maintaining a stable light path. The holder (231) and the first lens barrel (232) may be made of aluminum. The holder (231) and the first lens barrel (232) can be manufactured by CNC (Computerized Numerical Control) machining of aluminum.

[0148] The first lens unit (233) can change the path of incident light to reach the prism (250). The first lens unit (233) may be a lens unit positioned adjacent to the light source unit (220). The first lens unit (233) may be positioned in the fourth direction in which light is irradiated from the light source (221). The first lens unit (233) may be positioned inside the first lens barrel (232). The first lens unit (233) may include a first-1 lens (233a), a first-2 lens (233b), a first spacer (233c), and a first retainer (233d). The optical axis direction of the first lens unit (233) may be parallel to the fourth direction in which the light source (221) irradiates light. The components of the first lens section (233) can be arranged in the order of the first retainer (233d), the first-1 lens (233a), the first spacer (233c), and the first-2 lens (233b) from the light source (221) side to the prism (250) side. A portion of the first retainer (233d) can be arranged to overlap the holder (231) in a direction perpendicular to the fourth direction. Additionally, a portion of the first retainer (233d) can be arranged to overlap the light source (221) in a direction perpendicular to the fourth direction. The first retainer (233d) can be arranged closest to the light source (221). A portion of the first-2 lens (233b) can protrude from the bottom of the first lens barrel (232). The light irradiated by the light source (221) can pass through the first-1 lens (233a) and the first-2 lens (233b) sequentially. A spacer (233c) can be placed between the first-1 lens (233a) and the first-2 lens (233b). The lower surface of the first-2 lens (233b) can be placed adjacent to the upper surface of the prism (250). However, the first-2 lens (233b) can be placed spaced apart from the upper surface of the prism (250) by a certain distance.

[0149] FIG. 18 is a perspective view of the holder and the first lens barrel of a project device combined according to an embodiment of the present invention, FIG. 19 is a side view of the holder and the first lens barrel of a project device combined according to an embodiment of the present invention, and FIG. 20 is a bottom view of the holder and the first lens barrel of a project device combined according to an embodiment of the present invention.

[0150] Referring to FIGS. 3 to 7 and FIGS. 15 to 20, the holder (231) may include a plurality of protrusions. The holder (231) may include first to third protrusions (231a, 231b, 231c). The first lens assembly (230) may be fixed on the housing (210) through the first to third protrusions (231a, 231b, 231c) of the holder (231). The first to third protrusions (231a, 231b, 231c) may each be placed on the first to third grooves (h1, h2, h3) of the housing (210). The first to third protrusions (231a, 231b, 231c) may protrude from the corners of the lower surface of the holder (231). The first protrusion (231a) may be positioned at one of the side corners of the holder (231) located adjacent to the second lens assembly (240). The second protrusion (231b) and the third protrusion (231c) may each be positioned at both side corners of the holder (231) located at a position spaced apart from the second lens assembly (240). The first to third protrusions (231a, 231b, 231c) may be positioned spaced apart from each other by a certain distance. The first protrusion (231a) and the second protrusion (231b) may be positioned spaced apart in a first direction. Additionally, the second protrusion (231b) and the third protrusion (231c) may be positioned spaced apart in a third direction. The first to third protrusions (231a, 231b, 231c) may overlap with the housing (210) in a first direction or a third direction. The holder (231) may include the first to third protrusions (231a, 231b, 231c) to allow the holder (231) to be stably fixed on the housing (210) while maintaining a certain angle.

[0151] The width in the first direction of the first protrusion (231a) may be smaller than the width in the first direction of the second protrusion (231b) and the third protrusion (231c). Accordingly, the holder (231) can be stably fixed to the housing (210), and at the same time, the width in the first direction of the holder (231) can be minimized, and the project device (200) can be miniaturized.

[0152] The width of the holder (231) in the second direction may increase as it moves away from the second lens assembly (240). The width of the holder (231) in the second direction may increase as it moves away from the second lens assembly (240) in the first direction. The width of the holder (231) in the second direction may vary depending on the position in the second direction. The holder (231) may include an upper surface (s1) and a lower surface (s2). The lower surface (s2) of the holder (231) may be positioned perpendicular to the second direction. Additionally, the lower surface (s2) of the holder (231) may be positioned parallel to the light modulator (260). The upper surface (s1) of the holder (231) may not be parallel to the lower surface (s2). The upper surface (s1) of the holder (231) may be the surface on which the light source unit (220) is positioned. Accordingly, the upper surface (s1) of the holder (231) may be positioned perpendicular to the direction in which the light source (221) of the light source unit (220) irradiates light. The upper surface (s1) of the holder (231) may be positioned perpendicular to the optical axis of the first lens unit (233). That is, the upper surface (s1) of the holder (231) may be positioned perpendicular to the fourth direction. The upper surface (s1) of the holder (231) may form a certain angle with the first direction. That is, the upper surface (s1) of the holder (231) may have a first angle (θ1) with the lower surface (s2) of the holder (231). In addition, the upper surface (s1) of the holder (231) may have a first angle (θ1) with the upper surface of the light modulator (260). The first angle (θ1) may be 5˚ to 7˚. For example, the first angle (θ1) may be 6˚. Thus, the distance in the second direction between the upper surface (s1) and the lower surface (s2) of the holder (231) may increase as it moves further away from the second lens assembly (240). By forming a certain angle with the first direction with the upper surface (s1) of the holder (231), the light source (221) can irradiate light in the fourth direction, and accordingly, the light source unit (220) and the light modulator (260) are arranged facing each other to miniaturize the projector device (200), and at the same time, light can reach the light modulator (260) through the first lens unit (233) and the prism (250).In addition, the lower surface (s2) of the holder (231) is positioned in the first direction so that the holder (231) can be stably fixed on the housing (210).

[0153] The four sides of the holder (231) may be perpendicular to the top surface (s1). That is, the sides of the holder (231) may be arranged in a fourth direction. The holder (231) may include a first side (s3) adjacent to the second lens assembly (240) and a second side (s4) spaced apart from the second lens assembly (240). The area of ​​the first side (s3) of the holder (231) may be smaller than the area of ​​the second side (s4). The first side (s3) and the second side (s4) may be arranged side by side with each other.

[0154] The first lens barrel (232) may include a plurality of sides. The first lens barrel (232) may include a first barrel side through a sixth barrel side (p1, p2, p3, p4, p5, p6). The first barrel side (p1) may have the largest area among the plurality of sides of the first lens barrel (232). The first barrel side (p1) may include a curved shape. The second barrel side (p2) and the third barrel side (p3) may be sides positioned adjacent to both sides of the first barrel side (p1). Alternatively, the second barrel side (p2) and the third barrel side (p3) may be positioned to be connected to the first barrel side (p1). The second barrel side (p2) and the third barrel side (p3) may be positioned side by side so as to face each other. The second barrel side (p2) and the third barrel side (p3) may be positioned in a first direction. The second barrel side (p2) and the third barrel side (p3) may include a planar shape. That is, the second barrel side (p2) and the third barrel side (p3) may include a D-cut structure. The fourth barrel side (p4) may be a side adjacent to or connected to the second barrel side (p2). The fourth barrel side (p4) may include a curved shape. The area of ​​the fourth barrel side (p4) may be smaller than the area of ​​the second barrel side (p2). The fifth barrel side (p5) may be a side adjacent to or connected to the third barrel side (p3). The area of ​​the fifth barrel side (p5) may be smaller than the area of ​​the third barrel side (p3). The fifth barrel side (p5) may include a planar shape. That is, the fifth barrel side (p5) may include a D-cut structure. The sixth barrel side (p6) may be a side positioned between the fourth barrel side (p4) and the fifth barrel side (p5). The sixth barrel side (p6) may be positioned in a third direction. The sixth barrel side (p6) may include a planar shape. That is, the sixth barrel side (p6) may include a D-cut structure.Accordingly, the side of the first lens barrel (232) may include four D-cut structures. By including four D-cut structures on the side of the first lens barrel (232), the first lens barrel (232) can be assembled to be stably placed within the housing (210) while maintaining the size of the first lens barrel (232), and the first lens barrel (232) can be prevented from colliding with the holder (231), the housing (210), and the prism (250).

[0155] The first lens barrel (232) may include a first barrel bottom surface (p7) and a second barrel bottom surface (p8). The bottom surface (p7) of the first lens barrel (232) may be positioned parallel to the upper surface (s1) of the holder (231). That is, the bottom surface (p7) of the first lens barrel (232) may be positioned perpendicular to the fourth direction. Accordingly, the inner surface of the first lens barrel (232) may all have the same width in the fourth direction, and the first lens barrel (232) may stably support the first lens portion (233) positioned inside. The second barrel bottom surface (p8) may be positioned between the first barrel bottom surface (p7) and the first barrel side to the sixth barrel side (p1, p2, p3, p4, p5, p6). The first barrel bottom surface (p7) and the second barrel bottom surface (p8) may partially overlap with the prism (250) in the first direction. The first barrel bottom surface (p7) may include a flat shape, and the second barrel bottom surface (p8) may include a curved shape. When viewed from a third direction, one side of the second barrel bottom surface (p8) may be positioned parallel to the upper surface of the prism (250). That is, a part of the second barrel bottom surface (p8) and a part of the upper surface of the prism (250) may be positioned parallel. The first lens barrel (232) may include the second barrel bottom surface (p8) to secure a space for fixing the first lens part (233) while preventing the first lens part (233) from coming into contact with the prism (250).

[0156] The first lens assembly (230) may include a first inner surface (s5). The first inner surface (s5) of the first lens assembly (230) may come into contact with the first lens part (233). The first inner surface (s5) of the first lens assembly (230) may be positioned perpendicular to the upper surface (s1) of the holder (231). That is, the first inner surface (s5) of the first lens assembly (230) may be positioned parallel to the direction in which the light source (221) irradiates light. Accordingly, a plurality of lenses of the first lens part (233) may be stably fixed and positioned along the optical axis direction in which the light source (221) irradiates light. The first inner surface (s5) of the first lens assembly (230) may include a plurality of stepped structures.

[0157] FIG. 21 is a perspective view of a second lens assembly and a prism of a projector device according to an embodiment of the present invention, FIG. 22 is a cross-sectional view taken by cutting along CC' in FIG. 21, FIG. 23 is a perspective view of a second lens part according to an embodiment of the present invention, and FIG. 24 is a rear view of a second lens part according to an embodiment of the present invention.

[0158] Referring to FIGS. 3 to 7 and FIGS. 21 to 24, a projection device (200) according to an embodiment may include a second lens assembly (240) and a prism (250). The second lens assembly (240) and the prism (250) may be referred to as a projection system together with a light modulator (260). The projection system may serve to emit light converted by the light modulator (260) to the outside.

[0159] The second lens assembly (240) can change the path of light reflected by the prism (250) and emit it outward. The second lens assembly (240) can be positioned at the rear end of the prism (250). The second lens assembly (240) can be positioned outside the housing (210). The second lens assembly (240) can be positioned at the first aperture (a1) of the housing (210). The second lens assembly (240) can overlap with the first aperture (a1) of the housing (210) in a first direction. The second lens assembly (240) can transmit light that has passed through the first aperture (a1). The second lens assembly (240) may include a second lens barrel (241) and a second lens part (242). The second lens assembly (240) can be combined with the housing (210) by AA (Active Align) with respect to the light from the light source unit (220) on the outside of the housing (210). Thus, light alignment of the projection unit lens can be easily performed.

[0160] The second lens barrel (241) may be positioned outside the second lens portion (242) to support the second lens portion (242). The second lens barrel (241) may be coupled to the outside of the first side (S2) of the housing (210). The second lens barrel (241) may include a hole to accommodate the second lens portion (242) inside. The hole on the housing side (light incident direction side) of the second lens barrel (241) may be larger than the hole on the light exit direction side.

[0161] The second lens unit (242) may be referred to as a projection lens unit. The second lens unit (242) may emit light reflected from a prism (250). The second lens unit (242) may include a plurality of lenses. The second lens unit (242) may project light emitted from a projection device (200) onto a screen or a waveguide (or display unit). The second lens unit (242) may change the path of the light to adjust the size of the image so that the light beam enters within the effective aperture diameter (entrance pupil diameter, EPD) of a waveguide, etc.

[0162] The second lens section (242) may include a second-1 lens (242a), a second-2 lens (242b), a second-3 lens (242c), a second-4 lens (242d), a second-5 lens (242e), a second retainer (242f), a second spacer (242g), and a third spacer (242h). The plurality of lenses of the second lens section (242) may be arranged in the order of the second-1 lens (242a), the second-2 lens (242b), the second-3 lens (242c), the second-4 lens (242d), and the second-5 lens (242e) in the direction of light emission from the housing (210) side. The second-1 lens (242a) may be the lens closest to the light incident surface (housing side). The second-1 lens (242a) may overlap with the light modulator (260) in a second direction. The second-5 lens (242e) may be the lens closest to the light emission surface. The second retainer (242f) may be positioned at the front of the second-1 lens (242a) between the second-1 lens (242a) and the first side (S2) of the housing (210). The second retainer (242f) may be positioned adjacent to the first aperture (a1). Additionally, the second retainer (242f) may overlap with the light modulator (260) in a second direction. The second spacer (242g) may be positioned between the second-1 lens (242a) and the second-3 lens (242c). The second-2 lens (242b) may be positioned inside the second spacer (242g). The second-2 lens (242b) may be positioned to overlap with the second spacer (242g) in a second direction. The third spacer (242h) may be positioned between the second-4 lens (242d) and the second-5 lens (242e). A portion of the second-5 lens (242e) may be positioned inside the third spacer (242h) to overlap with the third spacer (242h) in a second direction. The diameter of the second-1 lens (242a) may be larger than the diameters of the second-3 lens (242c) and the second-4 lens (242d).The diameters of the second-2 lens (242b) and the second-5 lens (242e) may be smaller than the diameters of the second-3 lens (242c) and the second-4 lens (242d).

[0163] The second retainer (242f) may be positioned between the second-1 lens (242a) and the first side (S2) of the housing (210). The area of ​​the outer surface of the second retainer (242f) may be larger than the area of ​​the second outer surface (a1-2) of the first aperture (a1). Accordingly, the second retainer (242f) may not block light emitted through the first aperture (a1) while fixing a plurality of lenses within the second lens barrel (241). The second retainer (242f) may overlap the second lens barrel (241) in a direction perpendicular to the first direction. The second retainer (242f) may be positioned inside the second lens barrel (241). Additionally, the second retainer (242f) may be spaced a certain distance from the first side (S2) of the housing (210) in the first direction. Accordingly, when the second lens barrel (241) is coupled to the first side (S2), the second lens part (242) is spaced apart from the prism (250) by a certain distance to secure a distance for controlling the light path.

[0164] The second retainer (242f) may include a first retainer groove (r1) and a second retainer groove (r2). The first retainer groove (r1) and the second retainer groove (r2) may be positioned on a surface adjacent to the first aperture (a1) of the second retainer (242f). The first retainer groove (r1) and the second retainer groove (r2) may have a certain width in the second direction. The first retainer groove (r1) and the second retainer groove (r2) may have a certain width in the first direction. Additionally, the first retainer groove (r1) and the second retainer groove (r2) may be positioned spaced apart from each other in the third direction. The first retainer groove (r1) and the second retainer groove (r2) may overlap with the second lens barrel (241) in the third direction. The second retainer (242f) can be coupled to the second lens barrel (241) through the first retainer groove (r1) and the second retainer groove (r2). The first retainer groove (r1) and the second retainer groove (r2) can be screw-assembled on the inside of the second lens barrel (241). The first retainer groove (r1) and the second retainer groove (r2) can be rotated on the inside of the second lens barrel (241) to intersect with the screw surface structure on the inner surface of the second lens barrel (241) and then fixed through an adhesive member. By screw-assembling the first retainer groove (r1) and the second retainer groove (r2) within the second lens barrel (241) and simultaneously double-coupled by an adhesive member, other components of the second lens part (242) can be stably fixed and supported within the second lens barrel (241).

[0165] The prism (250) can refract light passing through the first lens assembly (230) to reach the light modulator (260). Additionally, the prism (250) can reflect light reflected from the light modulator (260) to reach the second lens assembly (240).

[0166] The prism (250) may include a Total Internal Reflection Prism (TIR Prism). The prism (250) can change the direction of propagation of a light ray as described above. That is, the prism (250) can perform transmission and reflection of the light ray. Specifically, the prism (250) can transmit light that has passed through the first lens assembly (230) and reflect light reflected from the light modulator (260). Accordingly, the path of the light can be changed to the first direction or to the light modulator (260). The prism (250) may be an element of the illumination system and the projection system. With this configuration, the projection device according to the embodiment can be miniaturized.

[0167] The prism (250) may be placed within the first part (211) of the housing (210). The prism (250) may be placed at the rear end of the first lens assembly (230). The prism (250) may be placed between the first lens assembly (230) and the light modulator (260). The prism (250) may refract light passing through the first lens part (233) of the first lens assembly (230) to the light modulator (260). The prism (250) may overlap the light source part (220), the first lens assembly (230), and the light modulator (260) in a second direction. Additionally, the prism (250) may be placed at the front end of the second lens assembly (240). The prism (250) may reflect light reflected from the light modulator (260) to the second lens assembly (240). The prism (250) can be superimposed in a first direction with the second lens assembly (240). Additionally, the prism (250) can be superimposed in a first direction with the first lens part (233) and the second lens part (242).

[0168] The prism (250) may partially overlap with the first aperture (a1) in the first direction. Some areas of the prism (250) may not overlap with the first aperture (a1) in the first direction. The width of the prism (250) in the second direction may be greater than the width of the first aperture (a1) in the second direction. The prism (250) may partially overlap with the second aperture (a2) in the second direction. Some areas of the prism (250) may not overlap with the second aperture (a2) in the second direction. The prism (250) may partially overlap with the mirror portion (261) of the optical modulator (260) in the second direction. The width of the prism (250) in the first direction may be greater than the width of the second aperture (a2) in the first direction. Accordingly, the prism (250) is stably positioned on the second part (212) of the housing (210), and at the same time, light passing through the prism (250) can pass through the entire second aperture (a2).

[0169] FIG. 25 is a perspective view of the combined optical modulator and substrate portion of a project device according to an embodiment of the present invention, and FIG. 26 is a partial enlarged view of FIG. 7.

[0170] Referring to FIGS. 3 to 7, FIGS. 25 and FIGS. 26, a project device (200) according to an embodiment may include an optical modulator (260) and a substrate part (270).

[0171] The optical modulator (260) may include a Digital Micromirror Device (DMD). The optical modulator (260) may include a mirror section (261). The mirror section (261) may include a plurality of small mirrors. Each mirror may reflect or block light according to a signal (e.g., a digital signal). In other words, the optical modulator (260) may project an image (or video) corresponding to the image signal by controlling the state of each mirror based on an image signal applied through the substrate section (270). For example, if light is reflected by controlling the mirrors, a bright image area may be emitted, and if light is blocked, a dark image area may be emitted. The optical modulator (260) may include various optical modulation devices such as LCoS.

[0172] The optical modulator (260) may be placed within the second part (212) of the housing (210). The optical modulator (260) may reflect light incident through the second aperture (a2) of the housing (210). The optical modulator (260) may overlap with the light source part (220), the first lens assembly (230), and the prism (250) in a second direction. Additionally, the optical modulator (260) may overlap with the second lens assembly (240) in a second direction. The optical modulator (260) may be coupled with the substrate part (270).

[0173] The mirror portion (261) of the optical modulator (260) may be disposed on the substrate of the optical modulator (260). The mirror portion (261) may be a portion into which light is incident. The mirror portion (261) may partially overlap with the second aperture (a2) of the housing (210) in the second direction. A portion of the mirror portion (261) may not overlap with the second aperture (a2) in the second direction. Additionally, a portion of the mirror portion (261) may not overlap with the prism (250) in the second direction. The optical modulator (260) may include an optical modulator substrate (262), a window (263), an aperture portion (264), and a filling member (265). The window (263) may be disposed on the upper part of the mirror portion (261). The aperture portion (264) and the charging member (265) may be positioned on the outside of the mirror portion (261). The optical modulator substrate (262) may be combined with the substrate portion (270) to supply electricity or a signal to the mirror portion (261).

[0174] The substrate (270) can be electrically connected to the light source (220) and the optical modulator (260). The substrate (270) can be placed on the outer surface of the housing (210). The light source (220) and the optical modulator (260) can be placed on the substrate (270). The operation of the light source (220) and the optical modulator (260) can be controlled through the substrate (270). The substrate (270) can communicate with the control unit of an external device, etc., via wireless or wired connection. For example, an external control signal can be transmitted to the project device (200) through the substrate (270). Additionally, the project device (200) can output an image based on the transmitted control signal.

[0175] The substrate portion (270) may include a first sub-substrate (271) and a second sub-substrate (272). An optical modulator (260) may be disposed on the first sub-substrate (271). The first sub-substrate (271) may be electrically connected to the optical modulator (260). The first sub-substrate (271) may be disposed on the bottom surface of the housing (210). A light source portion (220) may be disposed on the second sub-substrate (272). The second sub-substrate (272) may be electrically connected to the light source portion (220). The second sub-substrate (272) may be disposed on the side of the housing (210). A light source substrate (222) of the substrate portion (270) may be disposed between the second sub-substrate (272) and the housing (210). The first sub-substrate (271) and the second sub-substrate (272) may be formed as a single or separate structure. The second sub-substrate (272) may be a structure extending in a second direction from one end of the first sub-substrate (271).

[0176] Although the above description has focused on the embodiments, this is merely an example and is not intended to limit the embodiments. A person skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For instance, each component specifically shown in the embodiments may be modified and implemented. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the embodiments set forth in the appended claims.

Claims

1. A light source unit including a light source that emits light; A first lens assembly including a first lens portion; A second lens assembly including a second lens portion; and It includes a light modulator that modulates and reflects the above light; The optical axis direction of the second lens part is arranged in the first direction, and The light source, the first lens assembly, and the light modulator are a project device that overlaps in a second direction perpendicular to the upper surface of the light modulator.

2. In Paragraph 1, The above first lens assembly is a project device comprising a holder coupled to the light source and a first lens barrel coupled to the holder and having the first lens portion disposed on the inside.

3. In Paragraph 2, A projection device in which the upper surface of the holder has the first direction and the first angle, and is positioned perpendicular to the direction in which the light source irradiates light.

4. In Paragraph 3, The upper surface of the above holder is a projection device positioned perpendicular to the optical axis of the first lens part of the first lens assembly.

5. In Paragraph 4, The lower surface of the above holder is positioned perpendicular to the above second direction, and The above holder is a project device comprising a first to third protrusion disposed on the lower surface of the holder.

6. In Paragraph 5, A project device in which the width in the second direction of the holder increases as it moves away from the second lens assembly in the first direction.

7. In Paragraph 5, It includes a housing coupled to the light source unit and the holder, and The above housing is a project device comprising third grooves that are respectively coupled to the first to third protrusions.

8. In Paragraph 5, The first protrusion is positioned adjacent to the second lens assembly, and The second protrusion is spaced apart from the first protrusion in the first direction, and The above-mentioned second protrusion and the above-mentioned third protrusion are a project device spaced apart in a third direction perpendicular to the above-mentioned first direction and the above-mentioned second direction.

9. In Paragraph 8, A project device in which the width of the first protrusion in the first direction is smaller than the width of the second protrusion and the third protrusion in the first direction.

10. In Paragraph 6, The area of ​​the first side of the holder adjacent to the second lens assembly is smaller than the area of ​​the second side of the holder spaced apart from the second lens assembly, and A project device in which the first side and the second side of the holder are positioned perpendicularly to the upper surface of the holder.

Images