Projector device and electronic device comprising same

Abstract

An embodiment discloses a projector device comprising: a light source unit emitting light in a first direction; an optical modulator modulating and reflecting the light; and a first prism disposed between the light source unit and the optical modulator, wherein the first prism includes a first layer to a third layer, and the first layer to the third layer overlap each other in a second direction perpendicular to the first direction.

Description

Project device and electronic device including same

[0001] The present invention relates 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, that is similar to reality but not real, created using artificial technology such as computers.

[0003] Augmented Reality (AR) is a technology that synthesizes virtual objects or information into the real environment to make them appear as objects that exist in the original environment.

[0004] Mixed reality (MR) or hybrid reality refers to the creation of new environments or information by merging the virtual and real worlds. In particular, it refers to real-time interaction between real and virtual worlds.

[0005] At this time, the created virtual environments and situations stimulate the user's five senses, allowing them to experience spatial and temporal experiences similar to reality, freely moving between reality and imagination. Furthermore, users can not only immerse themselves in these environments, but also interact with the objects embodied within them, using real devices to control and command them.

[0006] Recently, active research has been conducted on the gear and devices used in these fields. However, the need for miniaturization and improved optical performance of these devices is emerging.

[0007] The embodiment provides a projector device and an electronic device that are miniaturized and compact by adjusting the positions of a light source, a mirror, a lens, a prism, a light modulator, and a projector device used in AR (Augmented Reality) and the like, and an electronic device including the same.

[0008] In addition, a projector device and electronic device with reduced volume are provided by adjusting the position of the lens unit and prism.

[0009] In addition, a projector and electronic device are provided that improve optical performance by enhancing the light collection accuracy of multiple light sources.

[0010] The problem to be solved in the embodiment is not limited to this, and it can be said that the purpose or effect that can be understood from the solution or embodiment of the problem described below is also included.

[0011] A project device according to an embodiment includes a light source unit that emits light in a first direction; a light modulator that modulates and reflects the light; and a first prism disposed between the light source unit and the light modulator; wherein the first prism includes a first layer to a third layer, and the first layer to the third layer can overlap in a second direction perpendicular to the first direction.

[0012] The light source unit includes a first light source emitting a first light, a second light source emitting a second light, and a third light source emitting a third light, and the first light, the second light, and the third light may have different wavelengths.

[0013] The first light may be reflected at a first reflective surface which is a boundary between the first layer and the second layer, the second light may be reflected at a second reflective surface which is a boundary between the second layer and the third layer, and the third light may be reflected at a third reflective surface which is an outer side of the third layer.

[0014] The angles formed by the first reflective surface, the second reflective surface, and the third reflective surface with respect to the first direction may be different from each other.

[0015] The angle formed by the first reflective surface and the second reflective surface may be 5° or less.

[0016] The first light source, the second light source, and the third light source may be arranged at a predetermined distance apart in the second direction, and the second light source may be arranged between the first light source and the third light source.

[0017] The first prism includes a first side, a second side facing the first side and meeting at a point, and a third side positioned between the first side and the second side, and the first light to the third light can pass through the first side and be reflected by the second side and then be reflected by the first reflective surface to the third reflective surface, respectively, and then pass through the second side.

[0018] The reflection angle at which the first light is reflected on the second side may be greater than the reflection angle at which the second light is reflected on the second side, and the reflection angle at which the third light is reflected on the second side may be less than the reflection angle at which the second light is reflected on the second side.

[0019] The points at which the first to third lights are reflected on the second side surface of the first prism may be different from each other.

[0020] The paths of the first to third lights may be changed to be parallel to each other after being reflected on the first to third reflective surfaces of the first prism, respectively.

[0021] The second layer of the first prism may be laminated on the first layer of the first prism, and the third layer of the first prism may be laminated on the second layer of the first prism.

[0022] The width in the first direction of a portion of the second layer of the first prism may be greater than the width in the first direction of the first layer, and the width in the first direction of a portion of the third layer may be greater than the width in the first direction of the second layer.

[0023] The distance in the second direction between the second layer and the third layer of the first prism and the light modulator may increase as it gets farther away from the light source unit.

[0024] It may include a second prism disposed between the first prism and the optical modulator.

[0025] It further includes a first lens unit disposed between the first prism and the light source unit, and a second lens unit disposed between the first prism and the second prism, and a surface of the second lens unit adjacent to the first prism may include a curved surface protruding toward the first prism.

[0026] The difference between the angle formed by the first reflective surface of the first prism with respect to the first direction and the angle formed by the second reflective surface of the first prism with respect to the first direction may be greater than the difference between the angle formed by the second reflective surface of the first prism with respect to the first direction and the angle formed by the third reflective surface of the first prism with respect to the first direction.

[0027] The angle formed by the first reflective surface with the first direction may be greater than the angle formed by the second reflective surface or the third reflective surface with the first direction.

[0028] A projector device according to an embodiment comprises: a light source; a light source unit including the light source and emitting light in a first direction perpendicular to the light source; a light modulator modulating and reflecting the light; and a first prism and a second prism sequentially arranged between the light source unit and the light modulator, wherein the first prism includes first to third layers, and the second prism includes fourth to sixth layers, wherein the first to third layers of the first prism reflect the light in a second direction perpendicular to the first direction, and the fourth to sixth layers of the second prism may be laminated in a third direction perpendicular to the first and second directions.

[0029] The light source unit includes a first light source emitting a first light, a second light source emitting a second light, and a third light source emitting a third light, and the first light, the second light, and the third light may have different wavelengths.

[0030] The first light may be reflected at a first reflective surface which is a boundary between the first layer and the second layer of the first prism, the second light may be reflected at a second reflective surface which is a boundary between the second layer and the third layer of the first prism, and the third light may be reflected at a third reflective surface which is an outer side of the third layer of the first prism.

[0031] The first light may be reflected at the fourth reflective surface which is the outer side of the sixth layer of the second prism, the second light may be reflected at the fifth reflective surface which is the boundary between the fifth layer and the sixth layer of the second prism, and the third light may be reflected at the sixth reflective surface which is the boundary between the fourth layer and the fifth layer of the second prism.

[0032] A projector device according to an embodiment includes a first lens unit disposed between the first prism and the light source unit, the first layer of the first prism includes an outer surface facing the first lens unit, the first reflective surface of the first prism is disposed between the outer surface of the first layer of the first prism and the second reflective surface of the first prism, and the second reflective surface of the first prism can be disposed between the first reflective surface of the first prism and the third reflective surface of the first prism.

[0033] A projector device according to an embodiment includes a second lens portion onto which light emitted from the second prism is incident, the fourth layer of the second prism includes an outer surface facing the second lens portion, the fifth reflective surface of the second prism is disposed between the sixth reflective surface of the second prism and the fourth reflective surface of the second prism, and the sixth reflective surface of the second prism may be disposed between the outer surface of the fourth layer of the second prism and the fifth reflective surface of the second prism.

[0034] The first prism includes an outer surface facing the light source, and angles formed by the first reflective surface, the second reflective surface, and the third reflective surface with the outer surface of the first prism may be different from each other.

[0035] The above optical modulator can be arranged in a direction perpendicular to the third direction.

[0036] The paths of the first light, the second light, and the third light of the light source may overlap in the third direction after being reflected on the first reflective surface of the first prism, the second reflective surface of the first prism, and the third reflective surface of the first prism, respectively.

[0037] The paths of the first light, the second light, and the third light of the light source may overlap in the first direction after being reflected on the fourth reflective surface of the second prism, the fifth reflective surface of the second prism, and the sixth reflective surface of the second prism, respectively.

[0038] The project device according to the embodiment further includes a third prism disposed between the second prism and the optical modulator, wherein the first prism may not overlap with the third prism in the third direction.

[0039] The above light source unit may not overlap with the second prism and the third prism in the first direction.

[0040] The surface adjacent to the second prism of the second lens unit may include a curved surface protruding toward the second prism.

[0041] The distance in the third direction between the fifth layer of the second prism and the sixth layer of the second prism and the optical modulator may increase as the distance increases from the first prism.

[0042] The angle formed by the first reflective surface of the first prism with the outer surface of the first prism may be smaller than the angle formed by the second reflective surface of the first prism with the outer surface of the first prism, and the angle formed by the third reflective surface of the first prism with the outer surface of the first prism may be larger than the angle formed by the second reflective surface of the first prism with the outer surface of the first prism.

[0043] According to an embodiment, when using a projector device used for AR (Augmented Reality) and an electronic device including the same, a projector device and an electronic device that are miniaturized and compact can be provided by adjusting the positions of a light source, a mirror, a lens, a prism, a light modulator, and a projector device.

[0044] In addition, a projector device and electronic device with reduced volume can be provided by adjusting the position of the lens unit and prism.

[0045] In addition, a projector and electronic device can be provided that improve optical performance by improving the light collection accuracy of multiple light sources.

[0046] The various advantageous and beneficial effects of the present invention are not limited to the above-described contents, and will be more easily understood in the course of explaining specific embodiments of the present invention.

[0047] FIG. 1 is a block diagram showing the configuration of an extended reality electronic device according to an embodiment of the present invention.

[0048] Figure 2 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention;

[0049] Figure 3 is a perspective view of a project device according to an embodiment;

[0050] Fig. 4 is another perspective view of a project device according to an embodiment;

[0051] Figure 5 is a schematic diagram of the inside of a project device according to an embodiment;

[0052] Figures 6 and 7 are schematic diagrams of a first prism of a project device according to another embodiment;

[0053] Figures 8 to 10 are schematic diagrams of the inside of a project device according to another embodiment.

[0054] Figure 11 is a bottom view of the inside of the project device of Figure 10, viewed from below.

[0055] Fig. 12 is a perspective view of a project device according to another embodiment;

[0056] Fig. 13 is a perspective view of the inside of a project device according to another embodiment;

[0057] Figure 14 is a drawing of a view viewed in the third direction from Figure 13,

[0058] Figure 15 is a drawing of the view as seen in the first direction in Figure 13,

[0059] Fig. 16 is an enlarged view of the first prism of a project device according to another embodiment;

[0060] Fig. 17 is an enlarged view of a second prism of a project device according to another embodiment.

[0061] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0062] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0063] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0064] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0065] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0066] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0067] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0068] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0069] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0070] FIG. 1 is a block diagram showing the configuration of an extended reality electronic device according to an embodiment of the present invention.

[0071] 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). The components illustrated in FIG. 1 are not essential for implementing the electronic device (20), and thus, the electronic device (20) described in this specification may have more or fewer components than the components listed above.

[0072] 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. In addition, the wireless communication unit (21) may include one or more modules that connect the electronic device (20) to one or more networks.

[0073] 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.

[0074] The input unit (22) may include a camera or video input unit for inputting video signals, a microphone or audio input unit for inputting audio signals, and a user input unit (e.g., a touch key, a mechanical key, etc.) for receiving information from a user. Voice data or image data collected from the input unit (22) may be analyzed and processed into a user's control command.

[0075] 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.

[0076] 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 G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor (IR sensor), a fingerprint recognition sensor, an ultrasonic sensor, an optical sensor (e.g., a photographing device), 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 recognition sensor, etc.). Meanwhile, the electronic device (20) disclosed in the present specification may utilize information sensed by at least two or more of these sensors in combination.

[0077] The output unit (24) is for generating output related to visual, auditory, or tactile sensations, 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 be formed as a touch screen by forming a mutual layer structure with a touch sensor or by forming an integral structure. This touch screen may function 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, may provide an output interface between the augmented reality electronic device (20) and the user.

[0078] The interface unit (25) serves as a passageway for 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 the external device, and can perform mutual interaction by exchanging various input signals, sensing signals, and data.

[0079] For example, the interface unit (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.

[0080] In addition, the memory (26) stores data that supports various functions of the electronic device (20). The memory (26) can store a plurality of application programs (or applications) that run on the electronic device (20), data for the operation of the electronic device (20), and commands. At least some of these application programs can be downloaded from an external server via wireless communication. In addition, at least some of these application programs can exist on the electronic device (20) from the time of shipment for the basic functions of the electronic device (20) (e.g., call receiving and making functions, message receiving and making functions).

[0081] In addition to operations related to the application program, 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 through the components discussed above.

[0082] In addition, the control unit (27) can control at least some of the components by driving an application program stored in the memory (26) to provide appropriate information to the user or process a function. 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 drive the application program.

[0083] In addition, 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, a light sensor, a magnetic sensor, an infrared sensor, an ultrasonic sensor, a light sensor, etc. included in the sensing unit (23). In addition, the control unit (27) can also detect the movement of the user by using sensors provided in a controller that operates in conjunction with the electronic device (20).

[0084] Additionally, the control unit (27) can perform operations (or functions) of the electronic device (20) using an application program stored in the memory (26).

[0085] 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.

[0086] At least some of the above components may cooperate with each other to implement the operation, control, or control method of the electronic device according to various embodiments described below. In addition, the operation, control, or control method of the electronic device may be implemented on the electronic device by driving at least one application program stored in the memory (26).

[0087] Hereinafter, an electronic device described as an example of the present invention will be described based on an embodiment applied to an HMD (Head Mounted Display). However, embodiments of the electronic device according to the present invention may include a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a PDA (personal digital assistant), a PMP (portable multimedia player), a navigation device, a slate PC, a tablet PC, an ultrabook, and a wearable device. In addition to an HMD, the wearable device may include a smart watch, a contact lens, VR / AR / MR Glass, and the like.

[0088] FIG. 2 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

[0089] As illustrated in FIG. 2, an electronic device according to an embodiment of the present invention may include a frame (100), a projector device (200), and a display unit (300).

[0090] The electronic device may be provided as a glass type (smart glass). The glass type electronic device is configured to be worn on the head of the human body and may include a frame (case, housing, etc.) (100) for this purpose. The frame (100) may be formed of a flexible material to facilitate wearing.

[0091] The frame (100) is supported by the head and provides a space for mounting various components. As illustrated, electronic components such as a projector device (200), a user input unit (130), or an audio output unit (140) may be mounted on the frame (100). In addition, a lens covering at least one of the left and right eyes may be detachably mounted on the frame (100).

[0092] The frame (100) may have a shape of glasses worn on the face of the user's body as shown in the drawing, but is not necessarily limited thereto, and may also have a shape of goggles or the like worn in close contact with the user's face.

[0093] Such a frame (100) may include a front frame (110) having at least one opening, and a pair of side frames (120) extending in the y direction (in FIG. 2) intersecting the front frame (110) and being parallel to each other.

[0094] The frame (100) may have the same or different length (DI) in the x direction and length (LI) in the y direction.

[0095] The project device (200) is provided to control various electronic components provided in an electronic device. The project device (200) may be used interchangeably with 'optical output device', 'optical projector device', 'light irradiation device', 'optical device', etc.

[0096] The projector device (200) can generate an image or a video of a sequence of images that are displayed to the user. The projector device (200) can include an image source panel that generates an image and a plurality of lenses that diffuse and converge light generated from the image source panel.

[0097] 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 integrally formed by being built into the inside of one of the side frames (120). Alternatively, the project device (200) may be fixed to the front frame (110) or may be provided separately from the electronic device.

[0098] The display unit (300) may be implemented in the form of a head-mounted display (HMD). The HMD form refers to a display method that is mounted on the head and directly displays an image 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 and right eyes so that the image can be directly displayed in front of the user's eyes. In this drawing, the display unit (300) is positioned in a portion corresponding to the right eye so as to output an image toward the user's right eye. However, as described above, the present invention is not limited thereto and may be positioned for both the left and right eyes.

[0099] The display unit (300) can allow the user to visually perceive the external environment while simultaneously displaying images generated by the projector device (200). For example, the display unit (300) can project images onto the display area using a prism.

[0100] The display unit (300) may be formed to be translucent so that the projected image and the general field of view in front (the range that the user sees through his eyes) can be viewed simultaneously. For example, the display unit (300) may be translucent and formed of an optical member including glass.

[0101] And the display unit (300) can be inserted into and fixed to an opening included in the front frame (110), or can be positioned on the back surface of the opening (i.e., between the opening and the user) and fixed to the front frame (110). In the drawing, an example in which the display unit (300) is positioned on the back surface of the opening and fixed to the front frame (110) is shown, but the display unit (300) can be positioned and fixed to various positions of the frame (100).

[0102] As illustrated in FIG. 2, when the electronic device projects image light from the projector device (200) onto one side of the display unit (300), the image light is emitted to the other side through the display unit (300), thereby allowing the user to see the image generated from the projector device (200).

[0103] Accordingly, the user can view the external environment through the opening of the frame (100) and simultaneously view the image generated by the projector device (200). That is, the image output through the display unit (300) can be seen to overlap with the general field of view. By utilizing these display characteristics, electronic devices can provide augmented reality (AR) that superimposes a virtual image on a real image or background and shows it as a single image.

[0104] Furthermore, in addition to these operations, images generated by the external environment and the projector device (200) may be provided to the user with a time difference for a short period of time that is not recognized by the user. For example, within a single frame, the external environment may be provided to the user during one section, and images from the projector device (200) may be provided to the user during another section.

[0105] Alternatively, both overlap and time difference may be provided.

[0106] In addition, the projector device according to the embodiment may have a structure described below, or may be formed of a structure further including a waveguide and / or glass. In addition, the projector device may include a DLP (Digital Light Processing) projector or a projector device.

[0107] Additionally, in the project device according to the embodiment, the first direction may correspond to the 'X-axis direction' on the drawing. Furthermore, the second direction may correspond to the Y-axis direction on the drawing. The second direction may be a direction perpendicular to the first direction. Additionally, the third direction may correspond to the Z-axis direction. The third direction may be a direction perpendicular to the first and second directions.

[0108] FIG. 3 is a perspective view of a project device according to an embodiment, FIG. 4 is another perspective view of a project device according to an embodiment, and FIG. 5 is a schematic diagram of the inside of a project device according to an embodiment.

[0109] Referring to FIGS. 3 to 5, a project device (200) according to an embodiment may include a housing (210), a light source unit (220), a first prism (230), a second prism (240), a light modulator (250), a first lens unit (260), a second lens unit (270), and a projection lens unit (280).

[0110] The housing (210) may have a space or housing groove in which each component of the projector device (200) is accommodated or placed. The housing (210) may be located on the outside of the projector device (200). For example, a light source unit (220), a first prism (230), a second prism (240), a light modulator (250), a first lens unit (260), a second lens unit (270), and a projection lens unit (280) may be placed inside the housing (210).

[0111] Additionally, the housing (210) may have an open structure on one side. Accordingly, each of the above-described components may be assembled through the open area or surface. Furthermore, light may be emitted to the outside through the opening of the housing (210).

[0112] The housing (210) may have various shapes. For example, the housing (210) may have a hexahedral structure. Accordingly, the project device according to the embodiment can be easily mounted on an electronic device. Furthermore, the project device according to the embodiment can be easily miniaturized or compacted.

[0113] The light source unit (220) can emit light. The light source unit (220) can emit light in a first direction. The light source unit (220) can emit light of a specific wavelength band. For example, the light source unit (220) can output white light. Additionally, the light source unit (220) can output light of a red, green, or blue wavelength band.

[0114] The light source unit (220) may be disposed inside the housing (210). The light source unit (220) may emit light toward the first lens unit (260). The light source unit (220) may be disposed spaced apart from the first lens unit (260) in the first direction. In addition, the light source unit (220) may emit light toward the first prism (230). The light source unit (220) may be disposed spaced apart from the first prism (230) in the first direction. The light emitted by the light source unit (220) may be reflected by the first prism (230) and reach the second lens unit (270) or the second prism (240).

[0115] The light source unit (220) may include at least one light source. In an embodiment, the light source unit (220) may include first to third light sources (221, 222, 223). The first to third light sources (221, 222, 223) may be positioned adjacent to each other at a predetermined distance within the housing (210). The first light source (221) may emit first light. The second light source (222) may emit second light. The third light source (223) may emit third light. In addition, the first to third light sources (221, 222, 223) may emit light of different wavelength bands or colors. For example, the first light source (221) may emit first light of a blue wavelength. The second light source (222) can emit second light of a green wavelength. And, the third light source (223) can emit third light of a red wavelength. Since the light source unit (220) includes the first to third light sources (221, 222, 223), light can be irradiated from a single light source, thereby miniaturizing and compactizing the projector device.

[0116] In addition, the first to third light sources (221, 222, 223) may be arranged to be spaced apart from each other in the second direction. The first to third light sources (221, 222, 223) may be arranged to overlap each other in the second direction. The second light source (222) may be arranged between the first light source (221) and the third light source (223). The first light source (221) may be arranged at a position closer to the light modulator (250) than the second light source (222). The third light source (223) may be arranged at a position further away from the light modulator (250) than the second light source (222).

[0117] Additionally, in the project 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 direction from the second light source (222) toward the first lens unit (260). Furthermore, the second direction may correspond to the Y-axis direction in the drawing. The second direction may be a direction perpendicular to the first direction.

[0118] The first lens unit (260) may be arranged adjacent to the light source unit (220). Light emitted from the light source unit (220) may pass through the first lens unit (260). The first lens unit (260) may be positioned on the first direction side of the light source (220). Alternatively, the first lens unit (260) may be positioned on the emission direction side of the light source unit (220). The first lens unit (260) may be arranged between the light source unit (220) and the first prism (230). The first lens unit (260) may change the path of light emitted from the light source unit (220). Light emitted from the light source unit (220) may pass through the first lens unit (260) and reach the first prism (230) after its path is refracted. The first lens unit (260) may include a relay lens. The first lens unit (260) may transmit light from one location to another. That is, the first lens unit (260) may align or change the path of light. The first lens unit (260) may adjust the size of the light or image (maximum area of ​​light) provided by the illumination system, or compensate for optical differences.

[0119] The light may change its optical path after passing through the first lens unit (260). The first and third lights may change their optical paths toward the second light after passing through the first lens unit (260). The first and third lights may be refracted at a certain angle in the second direction after passing through the first lens unit (260). The second light may proceed without a change in its optical path after passing through the first lens unit (260).

[0120] The first prism (230) may be placed between the first lens unit (260) and the second lens unit (270). Light passing through the first lens unit (260) may pass through the first prism (230). Light passing through the first prism (230) may pass through the second lens unit (270). The first prism (230) may overlap with the light source unit (220) and the first lens unit (260) in the first direction. The first prism (230) may partially overlap with the second lens unit (270) in the first direction or the second direction. In addition, the first prism (230) may partially overlap with the second prism (240) in the first direction or the second direction. The first prism (230) can transmit and reflect light passing through the first lens unit (260) to reach the second lens unit (270).

[0121] The first prism (230) may include a total internal reflection prism (TIR prism). The first prism (230) can change the direction of propagation of light as described above. That is, the first prism (230) can perform transmission and reflection of light. Specifically, the first prism (230) can transmit light emitted (or transmitted) from the first lens unit (260) and reflect the transmitted light again. In addition, the first prism (230) can reflect the reflected light again. Accordingly, the path of the light can be changed to the second lens unit or the second prism. By this configuration, the miniaturization of the projector device according to the embodiment can be achieved.

[0122] The first prism (230) may include a plurality of side surfaces. The first prism (230) may include first side surfaces, second side surfaces, third side surfaces (S1, S2, S3).

[0123] The first side surface (S1) may be a surface on which light transmitted through the first lens unit (260) is incident. The first side surface (S1) may be arranged perpendicular to the first direction. Light emitted from the light source unit (220) may pass through the first side surface (S1) and be incident on the interior of the first prism (230). The first side surface (S1) may partially overlap with the light source unit (220) and the first lens unit (260) in the first direction. The first side surface (S1) may be a surface adjacent to the first lens unit (260) of the first prism (230). The points at which the first light, the second light, and the third light are incident on the first side surface (S1) may be different. The points at which the first light, the second light, and the third light are incident on the first side surface (S1) may be spaced apart from each other in the second direction. For example, the point at which the first light is incident on the first side (S1) may be located at the lowest point and may be the point closest to the light modulator (250). In addition, the point at which the third light is incident on the first side (S1) may be located at the highest point and may be the point farthest from the light modulator (250). The point at which the second light is incident on the first side (S1) may be located between the point at which the first light is incident and the point at which the third light is incident.

[0124] The second side (S2) may be a surface on which light incident through the first side (S1) is reflected. The light may pass through the first side (S1) of the first prism (230) and be reflected on the inside of the second side (S2). The second side (S2) may be a side adjacent to the second lens unit (270) of the first prism (230). The light reflected on the second side (S2) may change its path toward the third side (S3). The second side (S2) may partially overlap with the light source unit (220) and the first lens unit (260) in the first direction. In addition, the second side (S2) may partially overlap with the second lens unit (270) and the second prism (240) in the first direction or the second direction. The second side (S2) may form a certain angle with the first direction. A first layer (231) of a first prism (230) may be arranged on the second side (S2). The third side (S3) may be a surface on which light reflected on the second side (S2) is reflected again. The light may be reflected on the second side (S2) of the first prism (230) and then reflected again on the third side (S3). The points at which the first light, the second light, and the third light are reflected on the second side (S2) may be positioned spaced apart from each other. For example, the point at which the first light is reflected on the second side (S2) may be positioned at the lowest point and may be the point closest to the light modulator (250). In addition, the point at which the third light is reflected on the second side (S2) may be positioned at the highest point and may be the point farthest from the light modulator (250). The point at which the second light is reflected on the second side (S2) may be located between the point at which the first light is reflected and the point at which the third light is reflected. The reflection angle at which the first light is reflected on the second side (S2) may be greater than the reflection angle at which the second light is reflected on the second side (S2). In addition, the reflection angle at which the third light is reflected on the second side (S2) may be less than the reflection angle at which the second light is reflected on the second side (S2).

[0125] The third side (S3) may be a side spaced apart from the optical modulator (250). The third side (S3) may partially overlap with the second lens unit (270) and the second prism (240) in the first or second direction. The third side (S3) may form a certain angle with the first direction. The second layer (232) and the third layer (233) of the first prism (230) may be arranged on the third side (S3).

[0126] The first prism (230) may include a first layer (231), a second layer (232), and a third layer (233). The first layer (231), the second layer (232), and the third layer (233) may be a plurality of layers that overlap in the second direction. The first layer (231), the second layer (232), and the third layer (233) may include a form that is laminated in the second direction. The first layer (231), the second layer (232), and the third layer (233) may be formed in a manner that they are adhered to each other or fixed using a mechanism. The first layer (231), the second layer (232), and the third layer (233) may be sequentially arranged on the path of light.

[0127] The first layer (231) may be a layer arranged at the frontmost end of the first prism (230) along the path of light. The first layer (231) may be a portion where light passes through the first lens unit (260) and enters the first prism (230). The light may enter the first layer (231) through the first side (S1) and be reflected at the second side (S2). The first layer (231) may be arranged at the bottom of the second layer (232) and the third layer (233). The first layer (231) may be in contact with the second layer (232). The first layer (231) may be a layer closest to the light modulator (250) based on the second direction. The width of the first layer (231) in the second direction may decrease as it moves away from the light source unit (220). The boundary surface of the first layer (231) and the second layer (232) may be a first reflective surface (R1) on which the first light is reflected.

[0128] The second layer (232) may be a layer disposed at the stop of the first prism (230) in the path of light. The second layer (232) may be disposed between the first layer (231) and the third layer (233). The second layer (232) may be disposed on the top of the first layer (231). Additionally, the second layer (232) may be disposed on the bottom of the third layer (233). The boundary between the second layer (232) and the first layer (231) may be a first reflective surface (R1) on which the first light is reflected. The boundary between the second layer (232) and the third layer (233) may be a second reflective surface (R2) on which the second light is reflected. The width of the second layer (232) in the first direction may be greater than the width of the first layer (231) in the first direction. The width in the second direction of the second layer (232) may vary depending on the distance from the light source (220) in the first direction.

[0129] The third layer (233) may be a layer disposed at the rearmost end of the first prism (230) on the path of light. The third layer (233) may be disposed on top of the first layer (231) and the second layer (232). The third layer (233) may be in contact with the second layer (232). The boundary surface between the third layer (233) and the second layer (232) may be a second reflective surface (R2) on which the second light is reflected. The upper surface of the third layer (233) may be a third reflective surface (R3) on which the third light is reflected. The width of the third layer (233) in the second direction may vary depending on the distance from the light source (220) in the first direction.

[0130] The first prism (230) may include a first reflective surface (R1), a second reflective surface (R2), and a third reflective surface (R3). The first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may be surfaces on which the first light, the second light, and the third light are reflected. The first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may each reflect light of different wavelength bands. The first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may be disposed on the third side (S3) of the first prism (230). The first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may be formed in a manner of being coated on each layer of the first prism (230). The first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may include coating layers that enable reflection of light of different wavelength bands. For example, the first reflective surface (R1) may be a coating layer that reflects light of a blue wavelength band, the second reflective surface (R2) may be a coating layer that reflects light of a green wavelength band, and the third reflective surface (R3) may be a coating layer that reflects light of a red wavelength band.

[0131] The first reflective surface (R1) can reflect the first light emitted from the first light source (221). In addition, the first reflective surface (R1) can transmit the second light emitted from the second light source (222) and the third light emitted from the third light source (223). The first reflective surface (R1) may be a boundary surface between the first layer (231) and the second layer (232) of the first prism (230). The first reflective surface (R1) can reflect the first light reflected on the second side surface (S2) again. The first reflective surface (R1) may be disposed at the lower end of the first reflective surface (R2) and the second reflective surface (R3). In addition, the first reflective surface (R1) may be disposed at the front end of the first reflective surface (R2) and the second reflective surface (R3) on the path of the light. The point at which the first light is reflected on the first reflective surface (R1) may be located lower in the second direction than the points at which the second and third lights are reflected. In addition, the point at which the first light is reflected on the first reflective surface (R1) may be located further away from the first side (S1) in the first direction than the points at which the second and third lights are reflected.

[0132] The second reflective surface (R2) can reflect the second light emitted from the second light source (222). In addition, the second reflective surface (R2) can transmit the third light emitted from the third light source (223). The second reflective surface (R2) may be a boundary surface between the second layer (232) and the third layer (233). The second reflective surface (R2) may be arranged on the upper side of the first reflective surface (R1). In addition, the second reflective surface (R2) may be arranged on the lower side of the third reflective surface (R3). The second reflective surface (R2) may be arranged at the rear end of the first reflective surface (R1) and the front end of the third reflective surface (R3) on the path of the light. The point at which the second light is reflected on the second reflective surface (R2) may be located higher in the second direction than the point at which the first light is reflected, and may be located lower in the second direction than the point at which the third light is reflected. In addition, the point at which the second light is reflected on the second reflective surface (R2) may be located between the point at which the first light is reflected and the point at which the third light is reflected, with respect to the first direction.

[0133] The third reflective surface (R3) can reflect the third light emitted by the third light source (223). The third reflective surface (R3) may be the upper surface of the third layer (233). In addition, the third reflective surface (R3) may be included in the third side surface (S3) of the first prism (230). The third reflective surface (R3) may be disposed on the upper side of the second reflective surface (R2). The third reflective surface (R3) may be disposed at the rear end of the second reflective surface (R2) on the path of light. The point at which the third light is reflected on the third reflective surface (R3) may be located higher in the second direction than the point at which the first light is reflected and the point at which the second light is reflected. In addition, the point at which the third light is reflected on the third reflective surface (R3) may be located closer to the first side surface (S1) than the point at which the first light is reflected and the point at which the second light is reflected, based on the first direction.

[0134] Since the first prism (230) includes a first reflective surface (R1), a second reflective surface (R2), and a third reflective surface (R3), the first light source (221), the second light source (222), and the third light source (223) can be reflected through one prism in different paths, thereby miniaturizing the volume of the projector device and improving the light collection efficiency of lights of different wavelengths.

[0135] The angles of the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may be different from each other. The angles that the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) form with respect to the first direction may be different from each other. The angles of the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may differ by up to 5 degrees. By arranging the angles of the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) to be different from each other, the first light, the second light, and the third light reflected on the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) may travel along the same path and be incident on the light modulator (250), and the light collection efficiency of the first light, the second light, and the third light may be improved.

[0136] The first light, the second light, and the third light may be reflected by the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3), respectively, and then may face the second side surface (S2). In addition, the first light, the second light, and the third light may have their optical paths parallel after being reflected by the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3), respectively. The first light, the second light, and the third light may pass through the second side surface (S2) of the first prism (230) with their paths changed to be parallel. The first light, the second light, and the third light may pass through the second side surface (S2) and enter the second lens unit (270).

[0137] The second lens unit (270) may be disposed between the first prism (230) and the second prism (240). Light reflected from the first prism (230) may pass through the second lens unit (270). The second lens unit (270) may be disposed below the first prism (230). The second lens unit (270) may be disposed above the second prism (240). The second lens unit (270) may overlap at least partially with the first prism (230) in the second direction. The second lens unit (270) may transmit light reflected from the first prism (230). A surface of the second lens unit (270) adjacent to the first prism (230) may be curved. For example, the surface of the second lens unit (270) adjacent to the first prism (230) may be a convex surface toward the first prism (230). In addition, the surface of the second lens unit (270) adjacent to the second prism (240) may be a curved surface or a flat surface. The second lens unit (270) can transmit light from one location to another. That is, the second lens unit (270) can align or change the path of light. The second lens unit (270) can adjust the size of the light or image (maximum area of ​​light) provided by the illumination system, or compensate for optical differences.

[0138] The second prism (240) may be arranged at the rear end of the second lens unit (270). The second prism (240) may be arranged between the second lens unit (270) and the light modulator (250). The second prism (240) may partially overlap the second lens unit (270) in the first direction or the second direction. In addition, the second prism (240) may overlap the light modulator (250) in the second direction. In addition, the second prism (240) may partially overlap the projection lens unit (280) in the first direction. By this configuration, the second prism (240) may transmit the light emitted (or transmitted) from the second lens unit (270), and the transmitted light may be incident on the light modulator (250) and reflected back to the projection lens unit (280).

[0139] The second prism (240) may include a total internal reflection prism (TIR prism). The second prism (240) can change the direction of propagation of light as described above. That is, the second prism (240) can perform transmission and reflection of light. Specifically, the second prism (240) can transmit light emitted (or transmitted) from the second lens unit (270) and reflect light emitted from the light modulator (250). In addition, the second prism (240) can transmit light emitted from the light source unit (220) and reflect light emitted from the light modulator (250). Accordingly, the path of the light can be changed to the first direction or the light modulator. By this configuration, miniaturization of the projector device according to the embodiment can be achieved.

[0140] The optical modulator (250) may be placed at the rear end of the second prism (240). The optical modulator (250) may emit light transmitted through the second prism (240) back to the second prism (240). The optical modulator (250) may overlap the second prism (240) in the second direction. In addition, the optical modulator (250) may partially overlap the second lens unit (270) in the second direction. In addition, the optical modulator (250) may overlap the first prism (230) in the second direction.

[0141] The optical modulator (250) can project an image by reflecting incident light. For example, the optical modulator (250) can output or project an image or image based on an image signal input through a substrate. That is, the optical modulator (250) can modulate the light emitted from the light source unit (220). The optical modulator (250) reflects the illumination light into patterned light, etc., and the patterned light can pass through the projection lens unit (280) and be output to the outside of the projector device.

[0142] The optical modulator (250) according to the embodiment may include a digital micromirror device (DMD). The optical modulator (250) 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 (250) may control the state of each mirror based on an image signal applied through a substrate to project or display an image (or image) corresponding to the image signal. For example, when light is reflected by the control of the mirror, a bright image area may be output, and when light is blocked, a dark image area may be output.

[0143] The projection lens unit (280) may be arranged at the rear end of the second prism (240). When light emitted from the light modulator (250) is reflected by the second prism (240), the light reflected by the second prism (240) may be incident on the projection lens unit (280). The light described above may be projected by the projection lens unit (280). The projection lens unit (280) may project the light emitted from the projector device onto a screen or waveguide (or display unit). The projection lens unit (280) may be arranged to be spaced apart from the second prism (240) in a first direction. In addition, the projection lens unit (280) may overlap the second lens unit (270) in the first direction. Additionally, the projection lens unit (280) may partially overlap with the first prism (230) and the first lens unit (260) in the first direction.

[0144] In an embodiment, the projection lens unit (280) can adjust the size of the image so that light enters within the effective aperture diameter (enterance pupil diameter, EPD) of the waveguide or the like. To this end, the projection lens unit (280) according to the embodiment can include a lens barrel (not shown) and a plurality of lenses (or optical systems) (not shown) arranged within the lens barrel. The plurality of lenses can at least partially overlap the second prism (240) in the first direction.

[0145] Figures 6 and 7 are schematic diagrams of a first prism of a project device according to another embodiment.

[0146] Referring to FIGS. 6 and 7, the first prism (230) may include a first layer (231), a second layer (232), and a third layer (233). Referring to FIG. 6, one side of the first layer (231), the second layer (232), and the third layer (233) may include a shape in which one side is cut vertically. In this case, the first prism (230) may include a fourth side (S4) between the second side (S2) and the third side (S3). The fourth side (S4) may be formed in a direction parallel to the second direction. The fourth side (S4) may include one side of the first layer (231), the second layer (232), and the third layer (233). The first prism (230) can be made smaller in size by including the fourth side (S4), thereby enabling miniaturization and compactness of the projector device. Referring to Fig. 7, the second layer (232) can be formed as an empty space between the first layer (231) and the third layer (233). In this case, the third layer (233) can be formed by fixing it on the first layer (231) at a certain distance.

[0147] Figure 8 is a schematic diagram of the inside of a project device according to another embodiment.

[0148] The effective focal length (EFL) of the first lens unit (260) and the second lens unit (270) of the project device of FIG. 8 may be 2.8685 mm and the Fno (aperture value) may be 0.7859. In addition, the second direction distance from the light modulator (250) to the end of the first prism (230) may be 8.1 mm, and the first direction distance from the end adjacent to the light source unit (220) of the first lens unit (260) to the center of the light modulator (250) may be 10.2 mm.

[0149] The angle formed by the first reflective surface (R1) with respect to the first direction may be greater than the angle formed by the second reflective surface (R2) or the third reflective surface (R3) with respect to the first direction. In addition, the angle formed by the third reflective surface (R3) with respect to the first direction may be greater than the angle formed by the second reflective surface (R2) with respect to the first direction. In addition, the difference between the angle formed by the first reflective surface (R1) with respect to the first direction and the angle formed by the second reflective surface (R2) with respect to the first direction may be greater than the difference between the angle formed by the second reflective surface (R2) with respect to the first direction and the angle formed by the third reflective surface (R3) with respect to the first direction. The width between the first reflective surface (R1) and the second reflective surface (R2) may decrease as it moves away from the light source unit (220) in the first direction.

[0150] The angle formed by the first reflective surface (R1) with respect to the first direction may be 13.5° to 13.6°. The angle formed by the second reflective surface (R2) with respect to the first direction may be 10.4° to 10.6°. The angle formed by the third reflective surface (R3) with respect to the first direction may be 10.6° to 10.8°. For example, the angle formed by the first reflective surface (R1) with respect to the first direction may be 13.524°. In addition, the angle formed by the second reflective surface (R2) with respect to the first direction may be 10.495°. In addition, the angle formed by the third reflective surface (R3) with respect to the first direction may be 10.622°. The angles formed by the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) with respect to the third direction may be the same. The first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) can be arranged parallel to the third direction.

[0151] Figure 9 is a schematic diagram of the inside of a project device according to another embodiment.

[0152] The effective focal length of the first lens unit (260) and the second lens unit (270) of the project device of Fig. 9 may be 3.4551 mm and the Fno (aperture value) may be 0.9466. In addition, the second direction distance from the light modulator (250) to the end of the first prism (230) may be 8 mm, and the first direction distance from the end adjacent to the light source unit (220) of the first lens unit (260) to the center of the light modulator (250) may be 10.3 mm.

[0153] The angle formed by the first reflective surface (R1) with respect to the first direction may be greater than the angle formed by the second reflective surface (R2) or the third reflective surface (R3) with respect to the first direction. In addition, the angle formed by the third reflective surface (R3) with respect to the first direction may be greater than the angle formed by the second reflective surface (R2) with respect to the first direction. In addition, the difference between the angle formed by the first reflective surface (R1) with respect to the first direction and the angle formed by the second reflective surface (R2) with respect to the first direction may be greater than the difference between the angle formed by the second reflective surface (R2) with respect to the first direction and the angle formed by the third reflective surface (R3) with respect to the first direction. The width between the first reflective surface (R1) and the second reflective surface (R2) may decrease as it moves away from the light source unit (220) in the first direction.

[0154] The angle formed by the first reflective surface (R1) with respect to the first direction may be 13.7° to 13.9°. The angle formed by the second reflective surface (R2) with respect to the first direction may be 10.6° to 10.7°. The angle formed by the third reflective surface (R3) with respect to the first direction may be 10.7° to 10.9°. For example, the angle formed by the first reflective surface (R1) with respect to the first direction may be 13.81°. In addition, the angle formed by the second reflective surface (R2) with respect to the first direction may be 10.656°. In addition, the angle formed by the third reflective surface (R3) with respect to the first direction may be 10.78°. The angles formed by the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) with respect to the third direction may be the same. The first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) can be arranged parallel to the third direction.

[0155] Fig. 10 is a schematic diagram of the inside of a project device according to another embodiment, and Fig. 11 is a bottom view of the inside of the project device of Fig. 9 as viewed from below.

[0156] The effective focal length of the first lens unit (260) and the second lens unit (270) of the project device of Fig. 10 may be -1.63 mm and the Fno (aperture value) may be -0.488. In addition, the second direction distance from the light modulator (250) to the end of the first prism (230) may be 8.836 mm, and the first direction distance from the end adjacent to the light source unit (220) of the first lens unit (260) to the center of the light modulator (250) may be 9.536 mm.

[0157] The angle formed by the first reflective surface (R1) with respect to the first direction may be smaller than the angle formed by the second reflective surface (R2) or the third reflective surface (R3) with respect to the first direction. In addition, the angle formed by the third reflective surface (R3) with respect to the first direction may be larger than the angle formed by the second reflective surface (R2) with respect to the first direction. In addition, the difference between the angle formed by the first reflective surface (R1) with respect to the first direction and the angle formed by the second reflective surface (R2) with respect to the first direction may be larger than the difference between the angle formed by the second reflective surface (R2) with respect to the first direction and the angle formed by the third reflective surface (R3) with respect to the first direction. The width between the first reflective surface (R1) and the second reflective surface (R2) may increase as it moves away from the light source unit (220) in the first direction.

[0158] The angle formed by the first reflective surface (R1) with respect to the first direction may be 13.9° to 14.0°. The angle formed by the second reflective surface (R2) with respect to the first direction may be 14.2° to 14.3°. The angle formed by the third reflective surface (R3) with respect to the first direction may be 14.3° to 14.4°. For example, the angle formed by the first reflective surface (R1) with respect to the first direction may be 13.949°. In addition, the angle formed by the second reflective surface (R2) with respect to the first direction may be 14.251°. In addition, the angle formed by the third reflective surface (R3) with respect to the first direction may be 14.345°. The angles formed by the first reflective surface (R1), the second reflective surface (R2), and the third reflective surface (R3) with respect to the third direction may be different. The angle formed by the first reflective surface (R1) with respect to the third direction may be 3.32° to 3.33°. The second reflective surface (R2) may be arranged parallel to the third direction. The angle formed by the third reflective surface (R3) with respect to the third direction may be -3.28° to -3.29°. For example, the angle formed by the first reflective surface (R1) with respect to the third direction may be 3.327°. In addition, the angle formed by the third reflective surface (R3) with respect to the third direction may be -3.288°. The first reflective surface (R1) and the third reflective surface (R3) may be arranged to be inclined in opposite directions from the third direction.

[0159] FIG. 12 is a perspective view of a project device according to another embodiment, FIG. 13 is a perspective view of the inside of a project device according to another embodiment, FIG. 14 is a view as viewed in a third direction in FIG. 13, FIG. 15 is a view as viewed in a first direction in FIG. 13, FIG. 16 is an enlarged view of a first prism of a project device according to another embodiment, and FIG. 17 is an enlarged view of a second prism of a project device according to another embodiment.

[0160] Referring to FIGS. 12 to 17, a projector device (400) according to an embodiment may include a housing (410), a light source unit (420), a first prism (430), a second prism (440), a third prism (450), a light modulator (460), a first lens unit (470), a second lens unit (480), and a projection lens unit (490).

[0161] The housing (410) may have a space or housing groove in which each component of the projector device (400) is accommodated or placed. The housing (410) may be located on the outside of the projector device (400). For example, a light source unit (420), a first prism (430), a second prism (440), a third prism (450), a light modulator (460), a first lens unit (470), a second lens unit (480), and a projection lens unit (490) may be placed inside the housing (410).

[0162] Additionally, the housing (410) may have an open structure on one side. Accordingly, each of the above-described components may be assembled through the open area or surface. Furthermore, light may be emitted to the outside through the opening of the housing (410).

[0163] The housing (410) may have various shapes. For example, the housing (410) may have a hexahedral structure. Accordingly, the project device according to the embodiment can be easily mounted on an electronic device. Furthermore, the project device according to the embodiment can be easily miniaturized or compacted.

[0164] The light source unit (420) can emit light. The light source unit (420) can include a plurality of light sources that emit light. The light source unit (420) can emit light in a first direction. The first direction can mean the direction in which the light is emitted or a direction perpendicular to the light source. The light source unit (420) can emit light of a specific wavelength band. For example, the light source unit (420) can output white light. In addition, the light source unit (420) can output light of a red, green, or blue wavelength band.

[0165] The light source unit (420) may be disposed inside the housing (410). The light source unit (420) may emit light toward the first lens unit (470). The light source unit (420) may be disposed spaced apart from the first lens unit (470) in the first direction. In addition, the light source unit (420) may emit light toward the first prism (430). The light source unit (420) may be disposed spaced apart from the first prism (430) in the first direction. The light emitted by the light source unit (420) may be reflected by the first prism (430) and reach the second prism (440).

[0166] The light source unit (420) may include at least one light source. In an embodiment, the light source unit (420) may include first to third light sources (421, 422, 423). The first to third light sources (421, 422, 423) may be positioned adjacent to each other at a predetermined distance within the housing (410). The first light source (421) may emit first light. The second light source (422) may emit second light. The third light source (423) may emit third light. In addition, the first to third light sources (421, 422, 423) may emit light of different wavelength bands or colors. For example, the first light source (421) may emit first light of a red wavelength. The second light source (422) can emit second light of a green wavelength. And, the third light source (423) can emit third light of a blue wavelength. The paths of the first to third lights emitted by the first to third light sources (421, 422, 423) can be parallel to each other. Since the light source unit (420) includes the first to third light sources (421, 422, 423), light can be irradiated from a single light source, and accordingly, the projector device can be miniaturized and compact.

[0167] In addition, the first to third light sources (421, 422, 423) may be arranged to be spaced apart from each other in the first direction or the second direction. The first to third light sources (421, 422, 423) may be arranged so as not to overlap each other in the first direction. The second light source (422) may be arranged between the first light source (421) and the third light source (423). The first light source (421) may be arranged at a position further away from the light modulator (460) than the second light source (422). The third light source (421) may be arranged at a position closer to the light modulator (460) than the second light source (422).

[0168] In addition, in the project 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 direction from the second light source (422) toward the first lens unit (470). Furthermore, the second direction may correspond to the Y-axis direction in the drawing. The second direction may be a direction perpendicular to the first direction. In addition, the third direction may correspond to the Z-axis direction in the drawing. The third direction may be a direction perpendicular to the first direction and the second direction.

[0169] The first lens unit (470) may be arranged adjacent to the light source unit (420). Light emitted from the light source unit (420) may pass through the first lens unit (470). The first lens unit (470) may be positioned on the first direction side of the light source unit (420). Alternatively, the first lens unit (470) may be positioned on the emission direction side of the light source unit (420). The first lens unit (470) may be arranged between the light source unit (420) and the first prism (430). The first lens unit (470) may change the path of light emitted from the light source unit (420). Light emitted from the light source unit (420) may pass through the first lens unit (470) and reach the first prism (430) after its path is refracted. The first lens unit (470) may include a relay lens. The first lens unit (470) may transmit light from one location to another. That is, the first lens unit (470) may align or change the path of light. The first lens unit (470) may adjust the size of the light or image (maximum area of ​​light) provided by the illumination system, or compensate for optical differences.

[0170] The light may change its optical path after passing through the first lens unit (470). The first light and the third light may change their optical paths toward the second light after passing through the first lens unit (470). The first light and the third light may be refracted at a certain angle in the second direction after passing through the first lens unit (470). The second light may proceed without a change in its optical path after passing through the first lens unit (470). The first light, the second light, and the third light may proceed with their optical paths intersecting each other after passing through the first lens unit (470).

[0171] The first prism (430) may be placed between the first lens unit (470) and the second prism (440). Light passing through the first lens unit (470) may pass through the first prism (430). Light passing through the first prism (430) may pass through the second prism (440). The first prism (430) may overlap with the light source unit (420) and the first lens unit (470) in a first direction. The first prism (430) may partially overlap with the second prism (440) in a second direction. The first prism (430) may transmit and reflect light passing through the first lens unit (470) so that it reaches the second prism (440).

[0172] The first prism (430) may include a total internal reflection prism (TIR prism). The first prism (430) can change the direction of propagation of light as described above. That is, the first prism (430) can perform transmission and reflection of light. Specifically, the first prism (430) can transmit light emitted (or transmitted) from the first lens unit (470) and reflect the transmitted light again. In addition, the first prism (430) can reflect the reflected light again. Accordingly, the path of the light can be changed to the second prism. By this configuration, the miniaturization of the projector device according to the embodiment can be achieved.

[0173] The first prism (430) may include a plurality of side surfaces. The first prism (430) may include first side surfaces, second side surfaces, third side surfaces (S5, S6, S7).

[0174] The first side (S5) may be a surface on which light transmitted through the first lens unit (470) is incident. The first side (S5) may be arranged perpendicular to the first direction. Light emitted from the light source unit (420) may pass through the first side (S5) and be incident on the interior of the first prism (430). The first side (S5) may partially overlap with the light source unit (420) and the first lens unit (470) in the first direction. The first side (S5) may be a surface adjacent to the first lens unit (470) of the first prism (430). The points at which the first light, the second light, and the third light are incident on the first side (S5) may overlap or be different.

[0175] The second side (S6) may be a side spaced apart from the light source (420). The second side (S6) may partially overlap the second prism (440) in the second direction. The second side (S6) may form a certain angle with the first direction. The second layer (432) and the third layer (433) of the first prism (430) may be arranged on the second side (S6).

[0176] The third side (S7) may be a side adjacent to the second prism (440) of the first prism (430). The third side (S7) may be a side through which light reflected by the first prism (430) is emitted to the outside. The third side (S7) may be arranged perpendicular to the second direction.

[0177] The first prism (430) may include a first layer (431), a second layer (432), and a third layer (433). The first layer (431), the second layer (432), and the third layer (433) may be a plurality of layers that overlap in the first direction or the second direction. The first layer (431), the second layer (432), and the third layer (433) may include a laminated form. The first layer (431), the second layer (432), and the third layer (433) may be formed in a manner in which they are adhered to each other or fixed using a mechanism. The first layer (431), the second layer (432), and the third layer (433) may be sequentially arranged on a path of light.

[0178] The first layer (431) may be a layer disposed at the frontmost end of the first prism (430) along the path of light. The first layer (431) may be a portion where light passes through the first lens unit (470) and enters the first prism (430). The light may enter the first layer (431) through the first side (S5) and be reflected at the second side (S6). The first layer (431) may be disposed at the bottom of the second layer (432) and the third layer (433). The first layer (431) may be in contact with the second layer (432). The first layer (431) may be a layer closest to the light modulator (460) based on the first direction. The width of the first layer (431) in the second direction may decrease as it moves away from the light source unit (420). The boundary surface of the first layer (431) and the second layer (432) may be a first reflective surface (R4) on which the first light is reflected.

[0179] The second layer (432) may be a layer disposed at the stop of the first prism (430) in the path of light. The second layer (432) may be disposed between the first layer (431) and the third layer (433). The second layer (432) may be disposed on the top of the first layer (431). Additionally, the second layer (432) may be disposed on the bottom of the third layer (433). The boundary between the second layer (432) and the first layer (431) may be a first reflective surface (R4) on which the first light is reflected. The boundary between the second layer (432) and the third layer (433) may be a second reflective surface (R5) on which the second light is reflected. The width of the second layer (432) in the first direction may be greater than the width of the first layer (431) in the first direction. The width in the second direction of the second layer (432) may vary depending on the distance from the light source (420) in the first direction.

[0180] The third layer (433) may be a layer positioned at the rearmost end of the first prism (430) along the path of light. The third layer (433) may be positioned on top of the first layer (431) and the second layer (432). The third layer (433) may be in contact with the second layer (432). The boundary between the third layer (433) and the second layer (432) may be a second reflective surface (R5) on which the second light is reflected. The upper surface of the third layer (433) may be a third reflective surface (R6) on which the third light is reflected. The width of the third layer (433) in the second direction may vary depending on the distance from the light source (420) in the first direction.

[0181] The first prism (430) may include a first reflective surface (R4), a second reflective surface (R5), and a third reflective surface (R6).

[0182] The first reflective surface (R4) can reflect the first light emitted from the first light source (421). In addition, the first reflective surface (R4) can transmit the second light emitted from the second light source (422) and the third light emitted from the third light source (423). The first reflective surface (R4) may be a boundary surface between the first layer (431) and the second layer (432) of the first prism (430). The first reflective surface (R4) can reflect the first light reflected on the second side surface (S6) again. The first reflective surface (R4) may be disposed at the lower end of the second reflective surface (R5) and the third reflective surface (R6). In addition, the first reflective surface (R4) may be disposed at the front end of the second reflective surface (R5) and the third reflective surface (R6) on the path of the light. The first reflective surface (R4) may be positioned between the first surface (S5) of the first prism (430) and the second reflective surface (R5) of the first prism (430). The point at which the first light is reflected on the first reflective surface (R4) may be located lower in the second direction than the points at which the second light and the third light are reflected.

[0183] The second reflective surface (R5) can reflect the second light emitted from the second light source (422). In addition, the second reflective surface (R5) can transmit the third light emitted from the third light source (423). The second reflective surface (R5) may be a boundary surface between the second layer (432) and the third layer (433). The second reflective surface (R5) may be arranged on the upper side of the first reflective surface (R4). In addition, the second reflective surface (R5) may be arranged on the lower side of the third reflective surface (R6). The second reflective surface (R5) may be arranged at the rear end of the first reflective surface (R4) and the front end of the third reflective surface (R6) on the path of the light. The second reflective surface (R5) may be positioned between the first reflective surface (R4) of the first prism (430) and the third reflective surface (R6) of the first prism (430). The point at which the second light is reflected on the second reflective surface (R5) may be located higher in the second direction than the point at which the first light is reflected, and may be located lower in the second direction than the point at which the third light is reflected. In addition, the point at which the second light is reflected on the second reflective surface (R5) may be located between the point at which the first light is reflected and the point at which the third light is reflected, based on the first direction.

[0184] The third reflective surface (R6) can reflect the third light emitted by the third light source (423). The third reflective surface (R6) may be the upper surface of the third layer (433). In addition, the third reflective surface (R6) may be included in the second side surface (S6) of the first prism (430). The third reflective surface (R6) may be arranged on the upper side of the second reflective surface (R5). The third reflective surface (R6) may be arranged at the rear end of the second reflective surface (R5) on the path of the light. The point at which the third light is reflected on the third reflective surface (R6) may be located higher in the second direction than the point at which the first light is reflected and the point at which the second light is reflected.

[0185] Since the first prism (430) includes a first reflective surface (R4), a second reflective surface (R5), and a third reflective surface (R6), the first light source (421), the second light source (422), and the third light source (423) can be reflected through one prism in different paths, thereby miniaturizing the volume of the projector device and improving the light collection efficiency of lights of different wavelengths.

[0186] The angles of the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6) may be different from each other. The angles that the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6) form with the first surface (S5) of the first prism (430) may be different from each other. In addition, the angles that the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6) form with the third surface (S7) may be different from each other. The angles of the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6) may differ by up to 5 degrees. The angle formed by the first reflective surface (R4) and the first surface (S5) of the first prism (430) may be smaller than the angle formed by the second reflective surface (R5) of the first prism (430) and the first surface (S5) of the first prism (430). In addition, the angle formed by the third reflective surface (R6) of the first prism (430) and the first surface (S5) of the first prism (430) may be larger than the angle formed by the second reflective surface (R5) of the first prism (430) and the first surface (S5) of the first prism (430). By arranging the angles of the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6) differently from each other, the first light, the second light, and the third light reflected on the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6) can travel along the same path and enter the light modulator (460), thereby improving the light collection efficiency of the first light, the second light, and the third light.

[0187] The first reflective surface (R4) can form an angle of 0.2° to 0.25° with respect to the second direction. For example, the first reflective surface (R4) can form an angle of 0.2352° with respect to the second direction. The second reflective surface (R5) can form an angle of 2.1° to 2.2° with respect to the second direction. For example, the second reflective surface (R5) can form an angle of 2.1878° with respect to the second direction. The third reflective surface (R6) can form an angle of 4.15° to 4.25° with respect to the second direction. For example, the third reflective surface (R6) can form an angle of 4.1956° with respect to the second direction.

[0188] Additionally, the first reflective surface (R4) may form an angle of 3.9° to 4.0° with respect to the third direction. For example, the first reflective surface (R4) may form an angle of 3.9861° with respect to the third direction. The second reflective surface (R5) may form an angle of 0.04° to 0.05° with respect to the third direction. For example, the second reflective surface (R5) may form an angle of 0.0416° with respect to the third direction. The third reflective surface (R6) may form an angle of 4.3° to 4.4° with respect to the third direction. For example, the third reflective surface (R6) may form an angle of 4.3627° with respect to the third direction.

[0189] The first light, the second light, and the third light may be directed toward the third side surface (S7) after being reflected by the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6), respectively. The light paths of the first light, the second light, and the third light may be changed in the second direction after being reflected by the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6), respectively. The light paths of the first light, the second light, and the third light may form a certain angle with the second direction after being reflected by the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6), respectively. In addition, the light paths of the first light, the second light, and the third light may overlap in the third direction after being reflected by the first reflective surface (R4), the second reflective surface (R5), and the third reflective surface (R6), respectively. The first light, the second light, and the third light can pass through the third side (S7) of the first prism (430) by changing the path so that it overlaps in the third direction. The first light, the second light, and the third light can pass through the third side (S7) and enter the second prism (440).

[0190] The second prism (440) may be placed between the first prism (430) and the second lens unit (480). Light passing through the first prism (430) may pass through the second prism (440). Light passing through the second prism (440) may pass through the second prism (440). The second prism (440) may partially overlap with the first prism (430) in the second direction. The second prism (440) may transmit and reflect the light passing through the first prism (430) so that it reaches the second lens unit (480).

[0191] The second prism (440) may include a total internal reflection prism (TIR prism). The second prism (440) can change the direction of propagation of light as described above. That is, the second prism (440) can perform transmission and reflection of light. Specifically, the second prism (440) can transmit light emitted (or transmitted) from the first prism (430) and reflect the transmitted light again. In addition, the second prism (440) can reflect the reflected light again. Accordingly, the path of the light can be changed to the second lens unit (480). By this configuration, miniaturization of the projector device according to the embodiment can be achieved.

[0192] The second prism (440) may include multiple side surfaces. The second prism (440) may include a fourth side surface, a sixth side surface (S8, S9, S10).

[0193] The fourth side surface (S8) may be a surface on which light passing through the first prism (430) is incident. The fourth side surface (S8) may be arranged perpendicular to the second direction. The light may pass through the fourth side surface (S8) and be incident on the interior of the second prism (440). The fourth side surface (S8) may partially overlap with the first prism (430) in the second direction. The fourth side surface (S8) may be a surface of the second prism (440) adjacent to the first prism (430). The points on which the first light, the second light, and the third light are incident on the fourth side surface (S8) may be different. The points on which the first light, the second light, and the third light are incident on the fourth side surface (S8) may be spaced apart from each other in the third direction. For example, the point on which the first light is incident on the fourth side surface (S8) may be the point furthest from the sixth side surface (S10). Additionally, the point at which the third light is incident on the fourth side (S8) may be the point closest to the sixth side (S10). The point at which the second light is incident on the fourth side (S8) may be located between the point at which the first light is incident and the point at which the third light is incident.

[0194] The fifth side surface (S9) may be a surface on which light incident through the fourth side surface (S8) is reflected. The light may pass through the fourth side surface (S8) of the second prism (440) and be reflected on the inner side of the fifth side surface (S9). The fifth side surface (S9) may be a surface adjacent to the second lens unit (480) of the second prism (440). The light reflected on the fifth side surface (S9) may change its path toward the sixth side surface (S10). The fifth side surface (S9) may partially overlap with the first prism (430) or the second lens unit (480) in the second direction. The fifth side surface (S9) may form a certain angle with the second direction. The fourth layer (441) of the second prism (440) may be arranged on the fifth side surface (S9). The sixth side surface (S10) may be a surface on which light reflected on the fifth side surface (S9) is reflected again. The light may be reflected on the sixth side surface (S10) after being reflected on the fifth side surface (S9) of the second prism (440). The points at which the first light, the second light, and the third light are reflected on the fifth side surface (S9) may be positioned spaced apart from each other. For example, the point at which the first light is reflected on the fifth side surface (S9) may be the point farthest from the sixth side surface (S10). In addition, the point at which the third light is reflected on the fifth side surface (S9) may be the point closest to the sixth side surface (S10). The point at which the second light is reflected on the fifth side surface (S9) may be positioned between the point at which the first light is reflected and the point at which the third light is reflected.

[0195] The sixth side (S10) may be the side most distant from the second lens unit (480). The sixth side (S10) may partially overlap with the second lens unit (480) and the third prism (450) in the third direction. The sixth side (S10) may form a certain angle with the second direction. The fifth layer (442) and the sixth layer (443) of the second prism (440) may be arranged on the sixth side (S10).

[0196] The second prism (440) may include a fourth layer (441), a fifth layer (442), and a sixth layer (443). The fourth layer (441), the fifth layer (442), and the sixth layer (443) may be a plurality of layers that overlap in a third direction. The fourth layer (441), the fifth layer (442), and the sixth layer (443) may include a form that is laminated in the third direction. The fourth layer (441), the fifth layer (442), and the sixth layer (443) may be formed in a manner that they are adhered to each other or fixed using a mechanism. The fourth layer (441), the fifth layer (442), and the sixth layer (443) may be sequentially arranged on a path of light.

[0197] The fourth layer (441) may be a layer disposed at the frontmost edge of the second prism (440) along the path of light. The fourth layer (441) may be a portion where light passes through the first prism (430) and enters the second prism (440). The light may enter the fourth layer (441) through the fourth side (S8) and be reflected at the fifth side (S9). The fourth layer (441) may be disposed below the fifth layer (442) and the sixth layer (443). The fourth layer (441) may be in contact with the fifth layer (442). The fourth layer (441) may be a layer closest to the light modulator (460) based on the third direction. The width of the fourth layer (441) in the third direction may decrease as it moves away from the first prism (430). The boundary surface of the fourth layer (441) and the fifth layer (442) may be a sixth reflective surface (R9) on which the third light is reflected.

[0198] The fifth layer (442) may be a layer positioned at the stop of the second prism (440) in the path of light. The fifth layer (442) may be positioned between the fourth layer (441) and the sixth layer (443). The fifth layer (442) may be positioned on top of the fourth layer (441). Additionally, the fifth layer (442) may be positioned on the bottom of the sixth layer (443). The boundary between the fifth layer (442) and the fourth layer (441) may be the sixth reflective surface (R9) on which the third light is reflected. The boundary between the fifth layer (442) and the sixth layer (443) may be the fifth reflective surface (R8) on which the second light is reflected.

[0199] The sixth layer (443) may be a layer positioned at the rearmost end of the second prism (440) along the path of light. The sixth layer (443) may be positioned on top of the fourth layer (441) and the fifth layer (442). The sixth layer (443) may be in contact with the fifth layer (442). The boundary between the sixth layer (443) and the fifth layer (442) may be a fifth reflective surface (R8) on which the second light is reflected. The upper surface of the sixth layer (443) may be a fourth reflective surface (R7) on which the first light is reflected.

[0200] The second prism (440) may include a fourth reflective surface (R7), a fifth reflective surface (R8), and a sixth reflective surface (R9).

[0201] The sixth reflective surface (R9) can reflect the third light emitted from the third light source (423). In addition, the sixth reflective surface (R9) can transmit the first light emitted from the first light source (421) and the second light emitted from the second light source (422). The sixth reflective surface (R9) may be a boundary surface between the fourth layer (441) and the fifth layer (442) of the second prism (440). The sixth reflective surface (R9) can reflect the third light reflected on the fifth side surface (S9) again. The sixth reflective surface (R9) may be arranged at the lower end of the fourth reflective surface (R7) and the fifth reflective surface (R8). In addition, the sixth reflective surface (R9) may be arranged at the front end of the fourth reflective surface (R7) and the fifth reflective surface (R8) on the path of the light. The sixth reflective surface (R9) may be positioned between the fifth side surface (S9) of the second prism (440) and the fifth reflective surface (R8) of the second prism (440). The point at which the third light is reflected on the sixth reflective surface (R9) may be positioned lower in the third direction than the points at which the first light and the second light are reflected. In addition, the point at which the third light is reflected on the sixth reflective surface (R9) may be positioned further away from the fourth side surface (S8) in the second direction than the points at which the first light and the first light are reflected.

[0202] The fifth reflective surface (R8) can reflect the second light emitted from the second light source (422). In addition, the fifth reflective surface (R8) can transmit the first light emitted from the first light source (421). The fifth reflective surface (R8) may be a boundary surface between the fifth layer (442) and the sixth layer (443). The fifth reflective surface (R8) may be arranged on the upper side of the sixth reflective surface (R9). In addition, the fifth reflective surface (R8) may be arranged on the lower side of the fourth reflective surface (R7). The fifth reflective surface (R8) may be arranged at the rear end of the sixth reflective surface (R9) and the front end of the fourth reflective surface (R7) on the path of light. The fifth reflective surface (R8) may be positioned between the sixth reflective surface (R9) of the second prism (440) and the fourth reflective surface (R7) of the second prism (440). The point at which the second light is reflected on the fifth reflective surface (R8) may be located higher in the third direction than the point at which the third light is reflected, and may be located lower in the third direction than the point at which the first light is reflected. In addition, the point at which the second light is reflected on the fifth reflective surface (R8) may be located between the point at which the first light is reflected and the point at which the third light is reflected, based on the second direction.

[0203] The fourth reflective surface (R7) can reflect the first light emitted by the first light source (421). The fourth reflective surface (R7) may be the upper surface of the sixth layer (443). In addition, the fourth reflective surface (R7) may be included in the sixth side surface (S10) of the second prism (440). The fourth reflective surface (R7) may be disposed on the upper side of the fifth reflective surface (R8). The fourth reflective surface (R7) may be disposed at the rear end of the fifth reflective surface (R8) on the path of light. The point at which the first light is reflected on the fourth reflective surface (R7) may be located higher in the third direction than the point at which the second light is reflected and the point at which the third light is reflected. In addition, the point at which the first light is reflected on the fourth reflective surface (R7) may be located closer to the fourth side surface (S8) than the point at which the second light is reflected and the point at which the third light is reflected, based on the second direction.

[0204] Since the second prism (440) includes a fourth reflective surface (R7), a fifth reflective surface (R8), and a sixth reflective surface (R9), the first light source (421), the second light source (422), and the third light source (423) can be reflected through one prism in different paths, thereby miniaturizing the volume of the projector device and improving the light collection efficiency of lights of different wavelengths.

[0205] The angles of the fourth reflective surface (R7), the fifth reflective surface (R8), and the sixth reflective surface (R9) may be different from each other. The angles that the fourth reflective surface (R7), the fifth reflective surface (R8), and the sixth reflective surface (R9) form with respect to the second direction may be different from each other. The angles of the fourth reflective surface (R7), the fifth reflective surface (R8), and the sixth reflective surface (R9) may differ by up to 5 degrees. By arranging the angles of the fourth reflective surface (R7), the fifth reflective surface (R8), and the sixth reflective surface (R9) to be different from each other, the third light, the second light, and the first light reflected on the fourth reflective surface (R7), the fifth reflective surface (R8), and the sixth reflective surface (R9) may travel along the same path and be incident on the light modulator (460), and the light collection efficiency of the first light, the second light, and the third light may be improved.

[0206] According to the embodiment, the angle formed by the sixth reflective surface (R9) with respect to the second direction may be greater than the angle formed by the fifth reflective surface (R8) or the fourth reflective surface (R7) with respect to the second direction. In addition, the angle formed by the fourth reflective surface (R7) with respect to the second direction may be greater than the angle formed by the fifth reflective surface (R8) with respect to the second direction. In addition, the difference between the angle formed by the sixth reflective surface (R9) with respect to the second direction and the angle formed by the fifth reflective surface (R8) with respect to the second direction may be greater than the difference between the angle formed by the fifth reflective surface (R8) with respect to the second direction and the angle formed by the fourth reflective surface (R7) with respect to the second direction. The width between the sixth reflective surface (R9) and the fifth reflective surface (R8) may decrease as it moves away from the light source unit (420) in the second direction.

[0207] In another embodiment, the angle formed by the sixth reflective surface (R9) with respect to the second direction may be smaller than the angle formed by the fifth reflective surface (R8) or the fourth reflective surface (R7) with respect to the second direction. In addition, the angle formed by the fourth reflective surface (R7) with respect to the second direction may be larger than the angle formed by the fifth reflective surface (R8) with respect to the second direction. In addition, the difference between the angle formed by the sixth reflective surface (R9) with respect to the second direction and the angle formed by the fifth reflective surface (R8) with respect to the second direction may be larger than the difference between the angle formed by the fifth reflective surface (R8) with respect to the second direction and the angle formed by the fourth reflective surface (R7) with respect to the second direction. The width between the sixth reflective surface (R9) and the fifth reflective surface (R8) may increase as it moves away from the first prism (430) in the second direction.

[0208] The first light, the second light, and the third light may be reflected by the sixth reflective surface (R9), the fifth reflective surface (R8), and the fourth reflective surface (R7), respectively, and then may face the fifth side surface (S9). In addition, the first light, the second light, and the third light may be reflected by the sixth reflective surface (R9), the fifth reflective surface (R8), and the fourth reflective surface (R7), respectively, and then their optical paths may become parallel. The first light, the second light, and the third light may be reflected by the sixth reflective surface (R9), the fifth reflective surface (R8), and the fourth reflective surface (R7), respectively, and then their optical paths may overlap in the first direction. The first light, the second light, and the third light may pass through the fifth side surface (S9) of the second prism (440) with their paths changed to become parallel. The first light, the second light, and the third light may pass through the fifth side surface (S9) and enter the second lens unit (480).

[0209] Light can be reflected on each reflective surface of the first prism (430) and the second prism (440). As a result, the first light, the second light, and the third light can be aligned through two reflections on each of the reflective surfaces of the first prism (430) and the second prism (440) and focused into a single optical path. This allows for more precise alignment of the optical path than when focusing multiple lights using a single prism, thereby increasing the focusing accuracy and efficiency, and thus improving the optical performance of the projector.

[0210] The second lens unit (480) may be disposed between the second prism (440) and the third prism (450). Light reflected from the second prism (440) may pass through the second lens unit (480). The second lens unit (480) may be disposed below the second prism (440). The second lens unit (480) may be disposed above the second prism (440). The second lens unit (480) may overlap the second prism (440) at least partially in the second direction or the third direction. The second lens unit (480) may transmit light reflected from the second prism (440). A surface of the second lens unit (480) adjacent to the second prism (440) may be curved. For example, the surface of the second lens unit (480) adjacent to the second prism (440) may be a convex surface toward the second prism (440). In addition, the surface of the second lens unit (480) adjacent to the third prism (450) may be a curved surface or a flat surface. The second lens unit (480) can transmit light from one location to another. That is, the second lens unit (480) can align or change the path of light. The second lens unit (480) can adjust the size of the light or image (maximum area of ​​light) provided by the illumination system, or compensate for optical differences.

[0211] The third prism (450) may be arranged at the rear end of the second lens unit (480). The third prism (450) may be arranged between the second lens unit (480) and the light modulator (460). The third prism (450) may partially overlap the second lens unit (480) in the second direction or the third direction. In addition, the third prism (450) may overlap the light modulator (460) in the third direction. In addition, the third prism (450) may partially overlap the projection lens unit (490) in the third direction. With this configuration, the third prism (450) transmits the light emitted (or transmitted) from the second lens unit (480), and the transmitted light may be incident on the light modulator (460) and reflected back to the projection lens unit (490).

[0212] The third prism (450) may include a total internal reflection prism (TIR prism). The third prism (450) can change the direction of propagation of light as described above. That is, the third prism (450) can perform transmission and reflection of light. Specifically, the third prism (450) can transmit light emitted (or transmitted) from the second lens unit (480) and reflect light emitted from the light modulator (460). In addition, the third prism (450) can transmit light emitted from the light source unit (420) and reflect light emitted from the light modulator (460). Accordingly, the path of the light can be changed to the first direction or the light modulator. By this configuration, miniaturization of the projector device according to the embodiment can be achieved.

[0213] The optical modulator (460) may be placed at the rear end of the third prism (450). The optical modulator (460) may emit light transmitted through the third prism (450) back to the third prism (450). The optical modulator (460) may overlap with the third prism (450) in a third direction. In addition, the optical modulator (460) may partially overlap with the second lens unit (480) in a third direction. In addition, the optical modulator (460) may overlap with the second prism (440) in a third direction.

[0214] The optical modulator (460) can project an image by reflecting incident light. For example, the optical modulator (460) can output or project an image or image based on an image signal input through a substrate. That is, the optical modulator (460) can modulate the light emitted from the light source unit (420). The optical modulator (460) reflects the illumination light into patterned light, etc., and the patterned light can pass through the projection lens unit (490) and be output to the outside of the projector device.

[0215] The optical modulator (460) according to the embodiment may include a digital micromirror device (DMD). The optical modulator (460) 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 (460) may control the state of each mirror based on an image signal applied through a substrate to project or display an image (or image) corresponding to the image signal. For example, when light is reflected by the control of the mirror, a bright image area may be output, and when light is blocked, a dark image area may be output.

[0216] The projection lens unit (490) may be arranged at the rear end of the third prism (450). When light emitted from the light modulator (460) is reflected by the third prism (450), the light reflected by the third prism (450) may be incident on the projection lens unit (490). The light described above may be projected by the projection lens unit (490). The projection lens unit (490) may project the light emitted from the projector onto a screen or waveguide (or display unit). The projection lens unit (490) may be arranged to be spaced apart from the third prism (450) in the second direction. In addition, the projection lens unit (490) may overlap with the second lens unit (480) in the second direction. In addition, the projection lens unit (490) may partially overlap with the third prism (450) in the second direction.

[0217] In an embodiment, the projection lens unit (490) can adjust the size of the image so that light enters within the effective aperture diameter (EPD) of the waveguide or the like. To this end, the projection lens unit (490) according to the embodiment may include a lens barrel (not shown) and a plurality of lenses (or optical systems) (not shown) arranged within the lens barrel. The plurality of lenses may at least partially overlap the third prism (450) in the second direction.

[0218] Although the above description focuses on examples, these are merely examples and are not intended to limit the examples. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present examples. For example, each component specifically shown in the examples can be modified and implemented. In addition, 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 that emits light in a first direction; A light modulator that modulates and reflects the light; and A first prism disposed between the light source and the light modulator; The above first prism includes the first to third layers, A project device in which the first to third layers overlap in a second direction perpendicular to the first direction.

2. In paragraph 1, The light source unit includes a first light source emitting a first light, a second light source emitting a second light, and a third light source emitting a third light, A project device wherein the first light, the second light, and the third light have different wavelengths.

3. In paragraph 2, The above first light is reflected at the first reflective surface, which is the boundary between the first layer and the second layer, The second light is reflected at the second reflective surface, which is the boundary between the second layer and the third layer, A project device in which the third light is reflected on the third reflective surface, which is the outer side of the third layer.

4. In paragraph 3, A project device in which the angles formed by the first reflective surface, the second reflective surface, and the third reflective surface with respect to the first direction are different from each other.

5. In paragraph 4, A projector device in which the angle formed by the first reflective surface and the second reflective surface is 5° or less.

6. In paragraph 2, The first light source, the second light source, and the third light source are arranged at a certain distance apart in the second direction, A projector device wherein the second light source is positioned between the first light source and the third light source.

7. In paragraph 3, The first prism includes a first side, a second side facing the first side and meeting at a point, and a third side located between the first side and the second side, A projector device in which the first to third lights pass through the first side, are reflected on the second side, and then are reflected on the first to third reflective surfaces, respectively, and then pass through the second side.

8. In paragraph 7, The reflection angle at which the first light is reflected on the second side is greater than the reflection angle at which the second light is reflected on the second side, A projector device in which the reflection angle at which the third light is reflected on the second side is smaller than the reflection angle at which the second light is reflected on the second side.

9. In paragraph 8, A project device in which the points at which the first light to the third light are reflected on the second side of the first prism are different from each other.

10. In paragraph 9, A project device in which the paths of the first to third lights are changed to be parallel to each other after being reflected on the first to third reflective surfaces of the first prism, respectively.

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