Smart eyeglasses

Abstract

The present embodiment relates to smart eyeglasses comprising: a front frame; a display unit disposed on the front frame; an adapter coupled to the front frame; and a project device which is coupled to the adapter and projects images onto the display unit, wherein a heat dissipation material for transferring, to the adapter, heat generated from the project device is disposed between the project device and the adapter.

Description

smart glasses

[0001] This embodiment relates to smart glasses.

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

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

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

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

[0006] Recently, active research is being conducted on equipment (gear, devices) used in these technological fields. However, the need for miniaturization of such equipment is emerging.

[0007] (Patent Document 1) KR 10-2025-0031521 A

[0008] The present embodiment aims to provide smart glasses including an adapter that secures a small projector device to the front frame.

[0009] The smart glasses according to the present embodiment include a front frame; a display unit disposed on the front frame; an adapter coupled to the front frame; and a projection device coupled to the adapter and projecting an image onto the display unit, and a heat dissipation material may be disposed between the projection device and the adapter to transfer heat generated by the projection device to the adapter.

[0010] The above heat dissipation material may include thermal paste.

[0011] The above-described project device includes a light source and a light modulator that modulates light irradiated from the light source, and the heat dissipation material may be positioned closer to the light source than to the light modulator.

[0012] The adapter includes a side plate portion coupled to the front frame and a bottom plate portion bent and extended from the side plate portion, and the heat dissipation material may be disposed between the project device and the bottom plate portion of the adapter.

[0013] At least a portion of the lower plate of the adapter may become thinner as it moves further away from the side plate.

[0014] The adapter includes a hole formed in the side plate, and the front frame includes a hole or groove corresponding to the hole of the adapter, and a fixing member for fixing the adapter to the front frame may be coupled to the hole of the adapter and the hole or groove of the front frame.

[0015] The above front frame includes a front body and a rear body, the display unit is positioned between the front body and the rear body, the adapter is coupled to a first part of the rear body, and the thickness of the first part of the rear body may become thicker as it extends outward from the bridge part of the front frame.

[0016] The display unit includes a light incident surface onto which an image projected from the projection device is projected, and the optical axis of the image projected from the projection device may not be orthogonal to the light incident surface of the display unit.

[0017] The optical axis of the image projected from the above-mentioned projecting device may be inclined toward the outer end of the display unit as it moves further away from the above-mentioned projecting device.

[0018] The optical axis of the image projected from the above-mentioned projecting device may be inclined toward the upper end of the display unit as it moves further away from the above-mentioned projecting device.

[0019] The rear body may include a groove to avoid interference with the project device.

[0020] The above-described project device includes a light source, a substrate on which the light source is placed, and a stiffener placed on the substrate opposite to the light source, and the heat dissipation material may be placed on the stiffener.

[0021] The lower plate of the above adapter may include a hole penetrating the lower plate.

[0022] The side plate portion of the above adapter may include a hole into which the EP lens assembly of the above project device is inserted.

[0023] The above adapter may be formed of a material different from the above front frame.

[0024] Through this embodiment, a small projector device can be mounted on the smart glasses. Accordingly, the size of the smart glasses can be minimized and made lighter.

[0025] FIG. 1 is a perspective view of a part of the configuration of smart glasses according to the present embodiment.

[0026] Figure 2 is an exploded perspective view of Figure 1.

[0027] Figure 3 is a partial enlarged view of Figure 1.

[0028] FIG. 4 is a perspective view illustrating the combined structure of the adapter of the smart glasses and the projector device according to the present embodiment.

[0029] Figure 5 is a perspective view taken from a different direction than Figure 4.

[0030] FIG. 6 is a perspective view of FIG. 5 with the adapter omitted.

[0031] FIG. 7 is a perspective view of an adapter for smart glasses according to the present embodiment.

[0032] Fig. 8 is a perspective view taken from a different direction than Fig. 7.

[0033] FIG. 9 is an enlarged view of a part of the smart glasses according to the present embodiment.

[0034] FIG. 10 is a perspective view of FIG. 9 with the project setup and adapter omitted.

[0035] FIG. 11 is a perspective view and an enlarged view illustrating the state in which an adapter is coupled to the front frame of smart glasses according to the present embodiment.

[0036] FIG. 12 is a perspective view and an enlarged view of FIG. 11 with the adapter omitted.

[0037] FIG. 13 is a partial perspective plan view illustrated to explain the angle between the wave guide and the optical axis of the projection device in smart glasses according to the present embodiment.

[0038] FIG. 14 is a plan view illustrating the state in which an adapter is coupled to the front frame of smart glasses according to the present embodiment.

[0039] FIG. 15 is a perspective view illustrating the state in which an adapter and a projector device are combined on the front frame of smart glasses according to the present embodiment.

[0040] Figure 16 (a) is a conceptual diagram showing the angle formed by the optical axis of the display unit and the projector device according to the embodiment viewed from above, and (b) is a conceptual diagram showing the angle formed by the optical axis of the display unit and the projector device viewed from the side.

[0041] FIG. 17 is an exploded view of a project device of smart glasses according to the present embodiment.

[0042] FIG. 18 is a cross-sectional view of a project device of smart glasses according to the present embodiment.

[0043] FIG. 19 is a block diagram showing the configuration of an extended reality electronic device according to an embodiment of the present invention.

[0044] FIG. 20 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

[0045] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0046] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0047] In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0048] Furthermore, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0049] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0050] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0051] And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly 'connected', 'combined', or 'connected' to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component.

[0052] Furthermore, when described as being formed or placed "above" or "below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above" or "below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0053]

[0054] The structure of the smart glasses according to the present embodiment will be described below with reference to the drawings.

[0055] FIG. 1 is a perspective view of a part of a smart glasses according to the present embodiment. FIG. 2 is an exploded perspective view of FIG. 1. FIG. 3 is a partial enlarged view of FIG. 1. FIG. 4 is a perspective view illustrating the combined structure of an adapter and a projector device of smart glasses according to the present embodiment. FIG. 5 is a perspective view viewed from a different direction than FIG. 4. FIG. 6 is a perspective view of FIG. 5 with the adapter omitted. FIG. 7 is a perspective view of an adapter of smart glasses according to the present embodiment. FIG. 8 is a perspective view viewed from a different direction than FIG. 7. FIG. 9 is an enlarged view of a part of a smart glasses according to the present embodiment. FIG. 10 is a perspective view of FIG. 9 with the projector device and adapter omitted. FIG. 11 is a perspective view and enlarged view illustrating the state in which an adapter is coupled to the front frame of smart glasses according to the present embodiment. FIG. 12 is a perspective view and enlarged view of FIG. 11 with the adapter omitted.

[0056] This embodiment may provide an assembly structure between a small Digital Light Processing (DLP) projector and an external structure. This embodiment may provide an assembly structure between a projector device (200) and a front frame (110). This embodiment may provide a structure including an adapter (400) having a through hole formed for assembly between the small DLP projector and the external structure. This embodiment may provide a heat dissipation structure for the light source LED of the small DLP projector. This embodiment may provide an assembly structure of a projector device (200) having an angle that takes into account the characteristics of a waveguide. This embodiment may provide an avoidance structure for a light modulator (260), for example, a DMD element. The aforementioned avoidance structure may be a groove (114) of the front frame (110).

[0057] The present embodiment may include smart glasses. The smart glasses may be AR (Augmented Reality) glasses, an image output device, a wearable device, etc.

[0058] Smart glasses may include a frame (100). The frame (100) may include a front frame (110). The front frame (110) may include a right front frame positioned on the right eye side of the wearer and a left front frame positioned on the left eye side of the wearer.

[0059] The front frame (110) may include a hole or groove (111) corresponding to a hole (411) of the adapter (400). A first fixing member (610) may be coupled to the hole or groove (111). The hole or groove (111) of the front frame (110) may be a structure for coupling with the adapter (400).

[0060] The front frame (110) may include a hole (115). A second fixing member (620) may be coupled to the hole (115). The hole (115) of the front frame (110) may be a structure for coupling between the front body (110a) and the rear body (110b).

[0061] The front frame (110) may include a groove (116). The groove (116) may be an EP lens insertion groove. A part of the second lens assembly (240) may be placed in the groove (116).

[0062] The front frame (110) may include a front body (110a) and a rear body (110b). The rear body (110b) may include a groove (114). The groove (114) may be formed to avoid interference with the project device (200). At least a portion of the groove (114) may have a shape corresponding to a portion of the project device (200). The groove (114) may be formed as a recess with a shape corresponding to the front portion of the project device (200). The groove (114) may be a structure for preventing interference between the front frame (110) of the eyeglass frame and the light modulator (260), i.e., the DMD portion, of the project device (200). In this embodiment, the structure is such that the distance between the display unit (300) and the project device (200) must be small. As shown in FIG. 9, a groove (114) which is an avoidance structure may be provided in a part of the front frame (100) to prevent interference between the front frame (110) and the light modulator (260).

[0063] The right front frame includes a right front body and a right rear body, and the left front frame may include a left front body and a left rear body.

[0064] The smart glasses may include a projection device (200). The projection device (200) may be a DLP projector. That is, the projection device (200) may be a projector that generates an image using a digital micromirror device. The projection device (200) may be combined with an adapter (400). The projection device (200) may project an image onto a display unit (300).

[0065] The project device (200) may include a light source (221). The light source (221) may be placed on a substrate (222). The light source (221) may be an RGB light source.

[0066] The project device (200) may include a substrate (222). The substrate (222) may be an LED FPCB. The substrate (222) may be electrically connected to a light source (221). The substrate (222) may be a flexible substrate.

[0067] The project device (200) may include a stiffener (223). The light source unit (220) may include a stiffener (223). The stiffener (223) may be a heat dissipation member. The stiffener (223) may be placed on a substrate (222). The stiffener (223) may be placed on the substrate (222) on the opposite side of the light source (221). The stiffener (223) may transfer heat generated from the light source (221). The stiffener (223) may release heat generated from the light source (221). The stiffener (223) may be formed of metal. The stiffener (223) may be formed of a material with high thermal conductivity. The stiffener (223) may be placed between the heat dissipation material (500) and the substrate (222).

[0068] The smart glasses may include a display unit (300). The display unit (300) may be a waveguide (WG). The display unit (300) may be placed on the front frame (100). The display unit (300) may be placed between the front body (110a) and the rear body (110b).

[0069] The smart glasses may include an adapter (400). The adapter (400) may be an interface part. The adapter (400) may be a ring part. The adapter (400) may be combined with the front frame (110). The adapter (400) may be formed of a different material from the front frame (110). The thermal conductivity of the adapter (400) and the thermal conductivity of the front frame (110) may be different from each other.

[0070] The adapter (400) may include a side plate (410). The side plate (410) may be combined with the front frame (110). The side plate (410) may be positioned between the project device (200) and the front frame (110).

[0071] The side plate (410) may include a hole (411). The hole (411) may be a coupling hole. A first fixing member (610) for coupling the adapter (400) and the front frame (110) may be coupled to the hole (411). The hole (411) may be a through hole for assembly with the front frame (110), which is an external structure. The hole (411) may be a screw hole.

[0072] The side plate (410) may include a hole (412). The hole (412) may be an EP lens insertion hole. An EP lens assembly of the projector device (200) may be inserted into the hole (412). The EP lens assembly may be a second lens assembly (240). The EP lens assembly may be an optical component that emits light imaged by a DMD. For example, the light modulator (260), such as the DMD, may be an electronic component that performs the role of imaging or visualizing the light of a light source.

[0073] In the following, one of the holes (411) and (412) of the side plate (410) may be referred to as the first hole and the other as the second hole.

[0074] The adapter (400) may include a bottom plate (420). The bottom plate (420) may be folded from the side plate (410). The bottom plate (420) may be folded and extended from the side plate (410). The bottom plate (420) may be extended from the side plate (410). The bottom plate (420) may support the project device (200) from below.

[0075] The bottom plate (420) may include a hole (421). The hole (421) may penetrate the bottom plate (420). A heat dissipation material (500) may be injected through the hole (421). The heat dissipation material (500) injected through the hole (421) may be placed between the bottom plate (420) and the stiffener (223). The hole (421) may be a hole for injecting a thermal interface material (TIM). At this time, the thermal interface material may be thermal grease. The bottom plate (420) may be formed as a structure for heat dissipation and heat dispersion of the light source (221).

[0076] The smart glasses may include a heat dissipation material (500). The heat dissipation material (500) may be thermal paste. The heat dissipation material (500) may be thermal grease. The heat dissipation material (500) may be placed between the project device (200) and the adapter (400). The heat dissipation material (500) may transfer heat generated from the project device (200) to the adapter (400). The heat dissipation material (500) may be a material with high thermal conductivity. The heat dissipation material (500) may be placed closer to the light source (221) than to the light modulator (260). The heat dissipation material (500) may be placed between the project device (200) and the bottom plate (420) of the adapter (400). The heat dissipation material (500) may be placed on the stiffener (223). The heat dissipation material (500) can be applied to the stiffener (223). The heat dissipation material (500) can be in contact with the stiffener (223).

[0077] In the following, both the heat dissipation material (500) and the stiffener (223) are configured for heat dissipation, and each can be referred to as a heat dissipation member. At this time, one of the heat dissipation material (500) and the stiffener (223) can be referred to as the first heat dissipation member and the other as the second heat dissipation member.

[0078] The smart glasses may include a first fixing member (610). The first fixing member (610) may be coupled to a hole (411) of the adapter (400) and a hole or groove (111) of the front frame (110). The first fixing member (610) may fix the adapter (400) to the front frame (110).

[0079] The smart glasses may include a second fixing member (620). The second fixing member (620) may connect the front body (110a) and the rear body (110b) of the front frame (110). The second fixing member (620) may be connected to the front body (110a) and the rear body (110b).

[0080] In the following, the first fixing member (610) and the second fixing member (620) can each be referred to as a fixing member.

[0081] FIG. 13 is a partial perspective plan view illustrating the angle between the wave guide and the optical axis of the projector device in smart glasses according to the present embodiment. FIG. 14 is a plan view illustrating the state in which an adapter is coupled to the front frame of smart glasses according to the present embodiment.

[0082] The rear body (110b) may include a first part (112) that is coupled to the adapter (400). The adapter (400) may be coupled to the first part (112) of the rear body (110b). As shown in FIG. 14, the thickness of the first part (112) of the rear body (110b) may become thicker as it extends outward from the bridge part (113) of the front frame (110).

[0083] The rear body (110b) may include a portion whose thickness increases as it moves away from the bridge portion (113). When viewed from above, the thickness of the first region of the rear body (110b) that contacts the inner end of the adapter (400) (see TH1 in FIG. 14) may be smaller than the thickness of the second region of the rear body (110b) that contacts the outer end of the adapter (400) (see TH2 in FIG. 14). Through such a structure, the adapter (400) coupled to the rear body (110b) can be positioned tilted relative to the display portion (300). Accordingly, the projector device (200) coupled to the adapter (400) can also be positioned tilted relative to the display portion (300).

[0084] Accordingly, as illustrated in FIG. 13, the angle formed by the wave guide (WG) and the optical axis (A) of the projector (200) may form an acute angle less than 90 degrees (see B in FIG. 13). The optical axis (A) of the projector (200) may be the projection direction of the projector (200). The projection direction of the projector (200) may coincide with the assembly orientation of the first fixed member (610). The display unit (300) may include a light incident surface onto which the image projected from the projector (200) is projected. The optical axis of the image projected from the projector (200) may not be orthogonal to the light incident surface of the display unit (300).

[0085] In this embodiment, the project device (200) can project an image or video onto the display unit (300) at an angle.

[0086] FIG. 15 is a perspective view illustrating the state in which an adapter and a projector device are combined on the front frame of smart glasses according to the present embodiment.

[0087] As illustrated in FIG. 15, at least a portion of the bottom plate (420) of the adapter (400) may become thinner as it moves away from the side plate (410). The thickness of the bottom plate (420) of the adapter (400) may decrease as it moves toward the rear. The thickness of the first region on the front frame (110) side of the bottom plate (420) of the adapter (400) (see TH1 in FIG. 15) may be greater than the thickness of the second region on the rear side of the bottom plate (420) of the adapter (400) (see TH2 in FIG. 15). Through such a structure, the project device (200) placed on the bottom plate (420) of the adapter (400) can be positioned tilted relative to the display unit (300).

[0088] Figure 16 (a) is a conceptual diagram showing the angle formed by the optical axis of the display unit and the projector device according to the embodiment viewed from above, and (b) is a conceptual diagram showing the angle formed by the optical axis of the display unit and the projector device viewed from the side.

[0089] As illustrated in FIG. 16(a), the optical axis of the image projected from the projection device (200) may be inclined toward the outer end of the display unit (300) as it moves away from the projection device (200). When viewed from above, the light incident surface of the display unit (300) and the optical axis of the projection device (200) may be positioned at an angle. When viewed from above, the light incident surface of the display unit (300) and the optical axis of the projection device (200) may form an acute angle.

[0090] When viewed from above, the projector device (200) can be fixed to the display unit (300) so as to be tilted in the left and right directions. When viewed from above, the optical axis of the projector device (200) can be positioned so as not to be perpendicular to the light incident surface of the display unit (300), that is, at an angle.

[0091] As illustrated in FIG. 16(b), the optical axis of the image projected from the projection device (200) may be inclined toward the upper end of the display unit (300) as it moves away from the projection device (200). When viewed from the side, the light incident surface of the display unit (300) and the optical axis of the projection device (200) may be positioned at an angle. When viewed from the side, the light incident surface of the display unit (300) and the optical axis of the projection device (200) may form an acute angle.

[0092] When viewed from the side, the projector device (200) can be fixed to the display unit (300) at an up-and-down tilt. When viewed from the side, the optical axis of the projector device (200) can be positioned at an angle, that is, not perpendicular to the light incident surface of the display unit (300).

[0093] FIG. 17 is an exploded perspective view of a projector device for smart glasses according to the present embodiment. FIG. 18 is a cross-sectional view of a projector device for smart glasses according to the present embodiment.

[0094] The project device (200) may include a housing (210). The housing (210) may have a space in which each component of the project device (200) is accommodated or placed. The housing (210) may be located on the outside of the project device (200) to protect other components, or may be combined with other components of the project device (200) to fix and support other components. For example, a first lens assembly (230), a prism (250), and a light modulator (260) may be placed on the inside of the housing (210). Additionally, a light source unit (220), a second lens assembly (240), and a substrate unit (270) may be placed on the outside of the housing (210).

[0095] The housing (210) can be distinguished into a first part in which the first lens assembly (230) and the prism (250) are placed, and a second part in which the light modulator (260) is placed. The first part may be placed on top of the second part. The width of the first part in the first direction may be smaller than the width of the second part in the first direction. Also, the width of the first part in the second direction may be larger than the width of the second part in the second direction. The width of the first part in the third direction may be the same as the width of the second part in the third direction. When viewed in the second direction, the center of the first part and the center of the second part may not coincide. When viewed in the second direction, the center of the first part may be spaced a certain distance in the first direction from the center of the second part. That is, the center of the first part may be placed close to one side of the second part.

[0096] A light source unit (220) may be disposed on the upper surface of the first part. The light source unit (220) is disposed on the upper surface of the first part, and may include a hole to allow light irradiated by the light source (221) to be incident. Additionally, a holder (231) of the first lens assembly (230) may be disposed on the upper surface of the first part. The upper surface of the first part may include a plurality of grooves into which a plurality of protrusions of the holder (231) are disposed. The upper surface of the first part may include first to third grooves. Each of the first to third grooves may be coupled with the first to third protrusions of the holder (231). The first to third grooves may be disposed on the corner portions of the upper surface of the first part. The first to third grooves may be disposed spaced apart from each other. The first groove may be disposed on the corner adjacent to the first aperture (a1) of the upper surface of the first part. The second and third grooves can be placed at the corners spaced apart from the first aperture (a1) on the upper surface.

[0097] A second lens assembly (240) may be disposed on the first side of the first part. The first side of the first part may include a first aperture (a1). Light reflected by the prism (250) may reach the second lens portion (242) of the second lens assembly (240) through the first aperture (a1). The first aperture (a1) may be disposed to overlap the prism (250) and the second lens assembly (240) in a first direction. The first aperture (a1) may include a D-cut structure. By including a D-cut structure, the first aperture (a1) can minimize the area that does not overlap with the prism (250) in the first direction. By including a D-cut structure, the first aperture (a1) can prevent light from entering the interior of the housing (210) from the outside through the space where the prism (250) is not disposed. Accordingly, unnecessary light can be prevented from being reflected by the prism (250) and entering the light modulator (260), and the optical performance of the projection device (200) can be improved.

[0098] A light modulator (260) may be disposed in the second part. The light modulator (260) may be disposed in a hole inside the second part. The lower surface of the second part may be in contact with the substrate part (270). The lower surface of the second part may be in contact with the substrate part (270) and may include a hole so that the light modulator (260) disposed on the substrate part (270) can be disposed inside the second part. The light modulator (260) may be disposed so as to partially overlap with the second lens assembly (240) in the second direction. The light modulator (260) may be disposed so as to partially overlap with the prism, the first lens assembly (230), and the light source (221) in the second direction.

[0099] Additionally, the second part may include a second aperture (a2). The second aperture (a2) may be positioned between the second part and the first part of the housing (210). That is, the second aperture (a2) may be positioned on the upper surface of the second part. Light reflected from the prism (250) through the second aperture (a2) may be incident on the light modulator (260), or light reflected from the light modulator (260) may be incident on the prism (250). The second aperture (a2) may be positioned to overlap with the prism (250) and the light modulator (260) in a second direction. Additionally, the second aperture (a2) may not overlap with the optical axis of the first lens part (233). That is, the extension of the optical axis of the first lens part (233) may not pass through the second aperture (a2). The second aperture (a2) may include an area that overlaps with the mirror portion (261) of the optical modulator (260) in the second direction and an area that does not overlap. The width of the second aperture (a2) in the first direction may be smaller than the width of the prism (250) in the first direction.

[0100] The project device (200) may include a light source unit (220). The light source unit (220) may irradiate light. The light source unit (220) may include at least one light source. The light source unit (220) may irradiate light of a plurality of wavelength bands. The light source unit (220) may be disposed on the outside of the housing (210). The light source unit (220) may be coupled with the first lens assembly (230), the housing (210), and the substrate unit (270) on the outside of the housing (210). The light source unit (220) may include a light source (221) that irradiates light. The light source (221) may include an LED. The light source (221) may be disposed on the substrate (222). The direction in which the light source (221) of the light source unit (220) irradiates light may be referred to as the fourth direction. The fourth direction may differ from the second direction. The light source (221) may be positioned to face the light modulator (260). The light source (221) may be positioned to overlap the light modulator (260) in the second direction. Additionally, the light source (221) may be positioned to overlap the prism (250) in the second direction. By positioning the light source (221) of the light source unit (220) to face the light modulator (260) and the prism (250) in the second direction so as to overlap them, the light source (221) can be positioned close to the light modulator (260) and the prism (250), and the light path can be formed short. Accordingly, the configuration of the lighting system can be simplified, and the projector device (200) can be miniaturized.

[0101] Additionally, the light source unit (220) may include a substrate (222) coupled to the first lens assembly (230) and the substrate unit (270). The substrate (222) may include a first sub-light source substrate coupled to the first lens assembly (230) and a second sub-light source substrate coupled to the substrate unit (270). A connecting portion may be disposed between the first sub-light source substrate and the second sub-light source substrate. The first sub-light source substrate and the second sub-light source substrate may form a certain angle. The first sub-light source substrate may form a certain angle with the first direction. The first sub-light source substrate may be disposed in a direction perpendicular to the fourth direction in which the light source (221) irradiates light. The second sub-light source substrate may be disposed in the second direction. The light source (221) may be disposed on the first sub-light source substrate of the substrate (222). A light source (221) may be placed on a first sub-light source substrate to irradiate light into the interior of the housing (210). A second sub-light source substrate may be placed between the housing (210) and the substrate portion (270). The second sub-light source substrate may be coupled between the first portion of the housing (210) and the second sub-sub

[0102] The project device (200) may include a first lens assembly (230). The first lens assembly (230) may be a collimator lens assembly. The first lens assembly (230) may change the path of light irradiated by the light source unit (220). Light passing through the first lens assembly (230) may reach the prism (250). The first lens assembly (230) may be coupled with the light source unit (220). The first lens assembly (230) may be coupled with the first sub-light source substrate of the light source unit (220). The first lens assembly (230) may overlap with the prism (250) and the light modulator (260) in a second direction. Additionally, the first lens assembly (230) may partially overlap with the second lens assembly (240) in a first direction.

[0103] The first lens assembly (230) may include a holder (231). The holder (231) may be coupled to a substrate (222) to secure the first lens barrel (232) and the first lens part (233). The holder (231) may be positioned between the first sub-light source substrate and the first lens barrel (232). Additionally, the holder (231) may be coupled to a housing (210). The holder (231) may be positioned on the upper surface of the housing (210).

[0104] The first lens assembly (230) may include a first lens barrel (232). The first lens barrel (232) may be combined with a holder (231) to support a lens. The first lens barrel (232) may be positioned at the bottom of the holder (231). A first lens portion (233) may be positioned inside the first lens barrel (232). The holder (231) and the first lens barrel (232) may include a hole through which the first lens portion (233) is positioned and light can pass. The holder (231) may overlap with the light source (221) in a direction perpendicular to the fourth direction. That is, the light source (221) may be positioned inside the hole of the holder (231). By positioning the light source (221) inside the holder (231) of the first lens assembly (230), the size of the lighting system can be miniaturized. Additionally, the light source unit (220) and the first lens unit (233) can be combined through the holder (231), thereby reducing the size of the lighting system while maintaining a stable light path. The holder (231) and the first lens barrel (232) may be made of aluminum. The holder (231) and the first lens barrel (232) may be manufactured by CNC (Computerized Numerical Control) machining of aluminum.

[0105] The first lens assembly (230) may include a first lens portion (233). The first lens portion (233) may change the path of incident light to reach the prism (250). The first lens portion (233) may be a lens portion positioned adjacent to the light source portion (220). The first lens portion (233) may be positioned in a fourth direction in which light is irradiated from the light source (221). The first lens portion (233) may be positioned inside the first lens barrel (232). The first lens portion (233) may include a first-1 lens, a first-2 lens, a first spacer, and a first retainer. The optical axis direction of the first lens portion (233) may be parallel to the fourth direction in which the light source (221) irradiates light. The components of the first lens section (233) can be arranged in the order of a first retainer, a first-1 lens, a first spacer, and a first-2 lens from the light source (221) side to the prism (250) side. A portion of the first retainer can be arranged to overlap the holder (231) in a direction perpendicular to the fourth direction. Additionally, a portion of the first retainer can be arranged to overlap the light source (221) in a direction perpendicular to the fourth direction. The first retainer can be arranged closest to the light source (221). A portion of the first-2 lens can protrude from the bottom of the first lens barrel (232). Light irradiated by the light source (221) can pass through the first-1 lens and the first-2 lens sequentially. The first spacer can be arranged between the first-1 lens and the first-2 lens. The lower surface of the first and second lenses may be positioned adjacent to the upper surface of the prism (250). However, the first and second lenses may be positioned at a certain distance from the upper surface of the prism (250).

[0106] The projection device (200) may include a second lens assembly (240) and a prism (250). The second lens assembly (240) and the prism (250) may be referred to as a projection system together with a light modulator (260). The projection system may serve to emit light converted by the light modulator (260) to the outside.

[0107] The projection device (200) may include a second lens assembly (240). The second lens assembly (240) can change the path of light reflected by the prism (250) and emit it outward. The second lens assembly (240) may be positioned at the rear end of the prism (250). The second lens assembly (240) may be positioned outside the housing (210). The second lens assembly (240) may overlap with the first aperture (a1) of the housing (210) in a first direction. The second lens assembly (240) can transmit light that has passed through the first aperture (a1). The second lens assembly (240) may include a second lens barrel (241) and a second lens part (242). The second lens assembly (240) can be combined with the housing (210) by AA (Active Align) with respect to the light from the light source unit (220) on the outside of the housing (210). Thus, light alignment of the projection unit lens can be easily performed.

[0108] The second lens barrel (241) may be positioned outside the second lens part (242) to support the second lens part (242). The second lens barrel (241) may be coupled to the outside of the first side of the housing (210). The second lens barrel (241) may include a hole so that the second lens part (242) is positioned inside. The hole on the housing side (light incident direction side) of the second lens barrel (241) may be larger than the hole on the light exit direction side.

[0109] The second lens unit (242) may be referred to as a projection lens unit. The second lens unit (242) may emit light reflected from a prism (250). The second lens unit (242) may include a plurality of lenses. The second lens unit (242) may project light emitted from a projection device (200) onto a screen or a waveguide (or display unit). The second lens unit (242) may change the path of the light to adjust the size of the image so that the light beam enters within the effective aperture diameter (entrance pupil diameter, EPD) of a waveguide, etc.

[0110] The second lens section (242) may include a second-1 lens, a second-2 lens, a second-3 lens, a second-4 lens, a second-5 lens, a second retainer, a second spacer, and a third spacer. The plurality of lenses of the second lens section (242) may be arranged in the order of the second-1 lens, the second-2 lens, the second-3 lens, the second-4 lens, and the second-5 lens in the direction of light emission from the housing (210) side. The second-1 lens may be the lens closest to the light incident surface (housing side). The second-5 lens may be the lens closest to the light emission surface. The second retainer may be placed at the front end of the second-1 lens between the second-1 lens and the first side of the housing (210). The second retainer may be placed adjacent to the first aperture (a1). The second spacer may be placed between the second-1 lens and the second-3 lens. The second-2 lens may be placed inside the second spacer. The second-2 lens may be placed to overlap with the second spacer in a second direction. The third spacer may be placed between the second-4 lens and the second-5 lens. A portion of the third-2-5 lens may be placed inside the third spacer and overlap with the third spacer in a second direction. The diameter of the second-1 lens may be larger than the diameters of the second-3 lens and the second-4 lens. The diameters of the second-2 lens and the second-5 lens may be smaller than the diameters of the second-3 lens and the second-4 lens.

[0111] The projection device (200) may include a prism (250). The prism (250) may refract light passing through the first lens assembly (230) to reach the light modulator (260). Additionally, the prism (250) may reflect light reflected from the light modulator (260) to reach the second lens assembly (240). The prism (250) may be an optical component for transmitting light from the DMD to the EP lens assembly.

[0112] The prism (250) may include a Total Internal Reflection Prism (TIR Prism). The prism (250) can change the direction of propagation of a light ray as described above. That is, the prism (250) can perform transmission and reflection of the light ray. Specifically, the prism (250) can transmit light that has passed through the first lens assembly (230) and reflect light reflected from the light modulator (260). Accordingly, the path of the light can be changed to the first direction or to the light modulator (260). The prism (250) may be an element of the illumination system and the projection system. With this configuration, the projection device according to the embodiment can be miniaturized.

[0113] The prism (250) may be placed within a first portion of the housing (210). The prism (250) may be placed at the rear end of the first lens assembly (230). The prism (250) may be placed between the first lens assembly (230) and the light modulator (260). The prism (250) can refract light passing through the first lens portion (233) of the first lens assembly (230) to the light modulator (260). The prism (250) can overlap the light source portion (220), the first lens assembly (230), and the light modulator (260) in a second direction. Additionally, the prism (250) can be placed at the front end of the second lens assembly (240). The prism (250) can reflect light reflected from the light modulator (260) to the second lens assembly (240). The prism (250) can overlap the second lens assembly (240) in a first direction.

[0114] The prism (250) may partially overlap with the first aperture (a1) in the first direction. Some areas of the prism (250) may not overlap with the first aperture (a1) in the first direction. The prism (250) may partially overlap with the second aperture (a2) in the second direction. Some areas of the prism (250) may not overlap with the second aperture (a2) in the second direction. The prism (250) may partially overlap with the mirror portion (261) of the optical modulator (260) in the second direction.

[0115] The projection device (200) may include a light modulator (260). The light modulator (260) may include a Digital Micromirror Device (DMD). The light modulator (280) may include a mirror section (261). The mirror section (261) may include a plurality of small mirrors. Each mirror may reflect or block light according to a signal (e.g., a digital signal). In other words, the light modulator (260) may project or project an image (or video) corresponding to the image signal by controlling the state of each mirror based on an image signal applied through the substrate section (270). For example, if light is reflected by controlling the mirrors, a bright image area may be emitted, and if light is blocked, a dark image area may be emitted. The light modulator (260) may include various light modulation devices such as Lcos.

[0116] The light modulator (260) may be placed within a second portion of the housing (210). The light modulator (260) may reflect light incident through the second aperture (a2) of the housing (210). The light modulator (260) may overlap in a second direction with the light source portion (220), the first lens assembly (230), and the prism (250). Additionally, the light modulator (260) may overlap in a second direction with the second lens assembly (240). The light modulator (260) may be coupled with the substrate portion (270).

[0117] The mirror portion (261) of the optical modulator (260) may be disposed on the substrate of the optical modulator (260). The mirror portion (261) may be a portion into which light is incident. The mirror portion (261) may partially overlap with the second aperture (a2) of the housing (210) in a second direction. A portion of the mirror portion (261) may not overlap with the second aperture (a2) in a second direction. Additionally, a portion of the mirror portion (261) may not overlap with the prism (250) in a second direction. The optical modulator (260) may include an optical modulator substrate (262), a window (263), an aperture portion (264), and a filling member. The window (263) may be disposed on the upper side of the mirror portion (261). The aperture portion (264) and the filling member may be disposed on the outer side of the mirror portion (261). The optical modulator substrate (262) is combined with the substrate portion (270) to supply electricity or a signal to the mirror portion (261).

[0118] The project device (200) may include a substrate (270). The substrate (270) may be electrically connected to a light source (220) and a light modulator (260). The substrate (270) may be placed on the outer surface of the housing (210). The light source (220) and the light modulator (260) may be placed on the substrate (270). The operation of the light source (220) and the light modulator (260) may be controlled through the substrate (270). The substrate (270) may communicate with a control unit of an external device, etc., via wireless or wired connection. For example, an external control signal may be transmitted to the project device (200) through the substrate (270). Additionally, the project device (200) may output an image based on the transmitted control signal. The substrate (270) may be a DMD RFPCB. The substrate portion (270) may include an RPCB area and an FPCB area. The substrate portion (270) may be electrically connected to a DMD.

[0119] The substrate portion (270) may include a first sub-substrate (271) and a second sub-substrate (272). An optical modulator (260) may be disposed on the first sub-substrate (271). The first sub-substrate (271) may be electrically connected to the optical modulator (260). The first sub-substrate (271) may be disposed on the bottom surface of the housing (210). A light source portion (220) may be disposed on the second sub-substrate (272). The second sub-substrate (272) may be electrically connected to the light source portion (220). The second sub-substrate (272) may be disposed on the side of the housing (210). A substrate (222) of the substrate portion (270) may be disposed between the second sub-substrate (272) and the housing (210). The first sub-substrate (271) and the second sub-substrate (272) may be formed as a single or separate structure. The second sub-substrate (272) may be a structure extending in a second direction from one end of the first sub-substrate (271).

[0120]

[0121] Hereinafter, the structure of an augmented reality electronic device according to the present embodiment will be described with reference to the drawings.

[0122] FIG. 19 is a block diagram showing the configuration of an extended reality electronic device according to an embodiment of the present invention.

[0123] An extended reality electronic device (20) may include a wireless communication unit (21). The wireless communication unit (21) may include one or more modules that enable wireless communication between the electronic device (20) and a wireless communication system, between the electronic device (20) and another electronic device, or between the electronic device (20) and an external server. Additionally, the wireless communication unit (21) may include one or more modules that connect the electronic device (20) to one or more networks.

[0124] The 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.

[0125] An extended reality electronic device (20) may include an input unit (22). 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 for receiving information from a user (e.g., a touch key, a mechanical key, etc.). Voice data or image data collected from the input unit (22) may be analyzed and processed into a user's control command.

[0126] The extended reality electronic device (20) may include a sensing unit (23). 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.

[0127] For example, the sensing unit (23) may include at least one of a proximity sensor, an illumination sensor, a touch sensor, an acceleration sensor, a magnetic sensor, a gravity sensor (G-sensor), a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor (IR sensor: infrared sensor), a fingerprint sensor (finger scan sensor), an ultrasonic sensor, an optical sensor (e.g., a shooting means), a microphone, a battery gauge, an environmental sensor (e.g., a barometer, a hygrometer, a thermometer, a radiation detection sensor, a heat detection sensor, a gas detection sensor, etc.), and a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the electronic device (20) disclosed in this specification may utilize a combination of information sensed from at least two of these sensors.

[0128] The augmented reality electronic device (20) may include an output unit (24). The output unit (24) is intended to generate outputs related to sight, hearing, or touch, and may include at least one of a display unit, an audio output unit, a haptic module, and an optical output unit. The display unit may form a layered structure with a touch sensor or be formed integrally to implement a touch screen. Such a touch screen functions as a user input means that provides an input interface between the augmented reality electronic device (20) and the user, and at the same time, can provide an output interface between the augmented reality electronic device (20) and the user.

[0129] An extended reality electronic device (20) may include an interface unit (25). The interface unit (25) serves as a channel 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 an external device and can perform mutual interaction by exchanging various input signals, sensing signals, and data.

[0130] For example, the interface section (25) may include at least one of a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio I / O (Input / Output) port, a video I / O (Input / Output) port, and an earphone port.

[0131] The augmented reality electronic device (20) may include a memory (26). The memory (26) stores data that supports various functions of the electronic device (20). The memory (26) may store a number of applications (application programs or applications) running on the electronic device (20), data for the operation of the electronic device (20), and commands. At least some of these applications may be downloaded from an external server via wireless communication. Additionally, at least some of these applications may exist on the electronic device (20) from the time of shipment for the basic functions of the electronic device (20) (e.g., phone incoming and outgoing functions, message receiving and sending functions).

[0132] The extended reality electronic device (20) may include a control unit (27). In addition to operations related to the application, the control unit (27) typically controls the overall operation of the electronic device (20). The control unit (27) can process signals, data, information, etc. that are input or output through the components described above.

[0133] Additionally, the control unit (27) can control at least some of the components by running an application stored in the memory (26) to provide appropriate information to the user or process functions. Furthermore, the control unit (27) can operate at least two or more of the components included in the electronic device (20) in combination with each other to run the application.

[0134] Additionally, the control unit (27) can detect the movement of the electronic device (20) or the user by using a gyroscope sensor, gravity sensor, motion sensor, etc. included in the sensing unit (23). Alternatively, the control unit (27) can detect an object approaching the electronic device (20) or the user by using a proximity sensor, light sensor, magnetic sensor, infrared sensor, ultrasonic sensor, light sensor, etc. included in the sensing unit (23). Furthermore, the control unit (27) can also detect the user's movement through sensors provided in a controller that operates in conjunction with the electronic device (20).

[0135] Additionally, the control unit (27) can perform the operation (or function) of the electronic device (20) using an application program stored in the memory (26).

[0136] The extended reality electronic device (20) may include a power supply unit (28). The power supply unit (28), under the control of the control unit (27), receives external power or internal power 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.

[0137] At least some of the above components may operate in cooperation with each other to implement the operation, control, or control method of an electronic device according to various embodiments described below. Additionally, the operation, control, or control method of an electronic device may be implemented on the electronic device by running at least one application program stored in memory (26).

[0138] Hereinafter, the electronic device described as an example of the present invention is described based on an embodiment applied to a Head Mounted Display (HMD). However, embodiments of the electronic device according to the present invention may include mobile phones, smartphones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation systems, slate PCs, tablet PCs, ultrabooks, and wearable devices. In addition to HMDs, wearable devices may include smartwatches, contact lenses, VR / AR / MR glasses, etc.

[0139]

[0140] Hereinafter, the structure of an augmented reality electronic device according to the present embodiment will be described with reference to the drawings.

[0141] FIG. 20 is a perspective view of an augmented reality electronic device according to an embodiment of the present invention.

[0142] The electronic device may be smart glasses. The electronic device may be AR glasses. The electronic device may be provided in a glass type. The glass-type electronic device is configured to be worn on the head of the human body and may be provided with a frame (100) for this purpose. The frame (100) may be formed of a flexible material to facilitate wearing.

[0143] Smart glasses may include a frame (100). The frame (100) is supported on the head and provides a space for mounting various components. As illustrated, electronic components such as a projector (200), a user input unit (130), or an audio output unit (140) may be mounted on the frame (100). Additionally, a lens covering at least one of the left and right eyes may be detachably mounted on the frame (100).

[0144] As shown in the drawing, the frame (100) may have the form of glasses worn on the face of the user, but is not necessarily limited thereto and may have the form of goggles worn in close contact with the user's face.

[0145] Such a frame (100) may include a front frame (110) having at least one opening, and a pair of side frames (120) that extend in the y direction (see FIG. 20) intersecting the front frame (110) and are parallel to each other.

[0146] The smart glasses may include a projection device (200). The projection device (200) is configured to control various electronic components provided in the electronic device. The projection device (200) may be used in combination with a light output device, a light projection device, a light irradiation device, an optical device, etc.

[0147] The projection device (200) can generate an image or a continuous video of images that is displayed to the user. The projection device (200) may include an image source panel that generates an image and a plurality of lenses that diffuse and converge the light generated from the image source panel.

[0148] The project device (200) may be fixed to one of the two side frames (120). For example, the project device (200) may be fixed to the inside or outside of one of the side frames (120), or may be formed integrally by being embedded inside one of the side frames (120). Alternatively, the project device (200) may be fixed to the front frame (110) or provided separately from the electronic device.

[0149] Smart glasses may include a display unit (300). The display unit (300) may be implemented in the form of a Head Mounted Display (HMD). An HMD form refers to a display method that is mounted on the head and displays images directly in front of the user's eyes. In order to provide images directly in front of the user's eyes when the user wears the electronic device, the display unit (300) may be positioned to correspond to at least one of the left eye and the right eye. In this drawing, the display unit (300) is exemplified as being located in the part corresponding to the right eye so as to output images toward the user's right eye. However, as described above, it is not limited to this and may be positioned on both the left eye and the right eye.

[0150] The display unit (300) can allow the user to visually perceive the external environment while simultaneously displaying an image generated by the projection device (200) to the user. For example, the display unit (300) can project an image onto a display area using a prism.

[0151] And the display unit (300) may be formed to be transparent so that the projected image and the general field of view in front, that is, the range the user looks at through their eyes, can be seen simultaneously. For example, the display unit (300) may be translucent and may be formed of an optical member including glass.

[0152] The display unit (300) may be inserted into and fixed to an opening included in the front frame (110), or positioned on the back of the opening, that is, between the opening and the user, and fixed to the front frame (110). Although the drawing illustrates an example in which the display unit (300) is positioned on the back of the opening and fixed to the front frame (110), the display unit (300) may be placed and fixed at various locations on the frame (100).

[0153] As illustrated in FIG. 20, when an image light for an image is incident on one side of a display unit (300) from a projection device (200), the image light is emitted through the display unit (300) to the other side, thereby allowing the image generated by the projection device (200) to be shown to the user.

[0154] Accordingly, the user can view the external environment through the opening of the frame (100) while simultaneously viewing the image generated by the projection device (200). That is, the image output through the display unit (300) can be seen overlapping with the normal field of view. The electronic device can utilize these display characteristics to provide Augmented Reality (AR), which overlays a virtual image onto a real-world image or background to display it as a single image.

[0155] Furthermore, in addition to this operation, the external environment and the image generated by the projection device (200) may be provided to the user with a time difference for a short period that is not perceived by the user. For example, within a single frame, the external environment may be provided to the user in one section, and the image from the projection device (200) may be provided to the user in another section. Alternatively, both overlap and time difference may be provided.

[0156] In addition, the projection device according to the embodiment may have a structure described below, or may be formed with a structure further including a waveguide or / and glass in the structure. In addition, the projection device may include a Digital Light Processing (DLP) projector or a projection device.

[0157]

[0158] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

Claims

1. Front frame; A display unit disposed on the front frame above; An adapter combined with the above front frame; and It includes a projector device that is coupled to the above adapter and projects an image onto the above display unit, Smart glasses in which a heat dissipation material is disposed between the project device and the adapter to transfer heat generated from the project device to the adapter.

2. In Paragraph 1, The above heat dissipation material is a smart glasses containing thermal paste.

3. In Paragraph 1, The above-described project device includes a light source and a light modulator that modulates light irradiated from the light source, and Smart glasses in which the heat dissipation material is positioned closer to the light source than to the light modulator.

4. In Paragraph 1, The above adapter includes a side plate portion coupled to the front frame and a bottom plate portion bent and extended from the side plate portion, and The above heat dissipation material is a smart glasses placed between the project device and the lower plate of the adapter.

5. In Paragraph 4, Smart glasses in which at least a portion of the lower plate of the adapter becomes thinner as it moves away from the side plate.

6. In Paragraph 4, The above adapter includes a hole formed in the side plate, and The above front frame includes a hole or groove corresponding to the hole of the above adapter, and Smart glasses in which a fixing member for fixing the adapter to the front frame is coupled to the hole of the adapter and the hole or groove of the front frame.

7. In Paragraph 1, The above front frame includes a front body and a rear body, and The above display unit is positioned between the front body and the rear body, and The above adapter is coupled to the first part of the rear body, and Smart glasses in which the thickness of the first part of the rear body becomes thicker towards the outer side from the bridge part of the front frame.

8. In Paragraph 1, The above display unit includes a light incident surface onto which an image projected from the above-mentioned projecting device is projected, and Smart glasses in which the optical axis of the image projected from the above-mentioned project device is not orthogonal to the light incident surface of the above-mentioned display unit.

9. In Paragraph 1, Smart glasses in which the optical axis of the image projected from the above-mentioned projecting device moves in an inclined direction toward the outer end of the display unit as it moves away from the above-mentioned projecting device.

10. In Paragraph 1, Smart glasses in which the optical axis of the image projected from the above-mentioned projecting device moves in an inclined direction toward the upper end of the display unit as it moves away from the above-mentioned projecting device.

Images