WO2024039128A1

WO2024039128A1 - Optical member and wearable device including same

Info

Publication number: WO2024039128A1
Application number: PCT/KR2023/011706
Authority: WO
Inventors: 김철
Original assignee: 엘지이노텍 주식회사
Priority date: 2022-03-30
Filing date: 2023-08-08
Publication date: 2024-02-22
Also published as: KR20230141398A

Abstract

An optical member according to an embodiment comprises: a housing; a lens module disposed inside the housing; a first reflective member that reflects light emitted from the lens module; a second reflective member that reflects light reflected from the first reflective member; and an emitting member through which light reflected from the second reflective member is emitted. The light reflected by the second reflective member passes through the first reflective member and travels to the emitting member.

Description

Optical member and wearable device including same

Embodiments relate to optical members and wearable devices including the same.

Recently, with the advancement of technology, various types of wearable devices that can be worn on the body are coming out. Among them, Augmented Reality (AR) devices are wearable devices in the form of glasses that are worn on the user's head. The augmented reality device provides visual information through a display. By this, the user can be provided with augmented reality services.

Augmented Reality is a mixture of real world information and virtual images by inserting 3D images into the real environment.

Real world information includes information that users do not need. Alternatively, real-world information may lack information needed by the user. However, augmented reality systems combine the real world and the virtual world. This allows interaction between the real world and the virtual world in real time.

Unlike virtual reality (VR) devices that block the view, the augmented reality (AR) device does not block the view even during use. Additionally, the augmented reality (AR) device displays a wide-screen display in front of your eyes when worn like regular glasses. In addition, the augmented reality (AR) device can provide expanded reality that combines reality and AR content by utilizing a 360° space for the user. Additionally, the augmented reality (AR) device can provide an optimized display to the user with both hands free.

The augmented reality device includes an optical module. The optical module provides augmented reality images to users.

The optical module includes a light source and various optical components that control the movement of light. Light emitted from the light source is collected, reflected, and scanned through various optical components. Thereby, the light moves to the glass disposed outside the optical module.

The image quality, weight, or driving voltage of the augmented reality device may vary depending on the arrangement or size of the optical components disposed inside the optical module. Therefore, an optical member with a new structure that can implement optimal image quality, driving voltage, and weight is required.

Embodiments provide an optical member and a wearable device that can be driven with low power.

Embodiments provide an optical member and a wearable device with improved image quality.

An optical member according to an embodiment includes a housing; and a lens module disposed within the housing; a first reflective member that reflects light emitted from the lens module; a second reflective member that reflects light reflected from the first reflective member; and an emitting member through which light reflected from the second reflecting member is emitted, and the light reflected through the second reflecting member passes through the first reflecting member and moves to the emitting member.

An optical member according to an embodiment includes a reflective member. Light incident and reflected by the second reflective member travels through the reflective member.

The reflective member includes two reflective portions. The angle between the incident light and the reflected light of the second reflective member is reduced by the reflective member. Accordingly, it is possible to prevent the size of the second reflective member from increasing in order to receive light incident on the second reflective member. Alternatively, it is possible to prevent the tilt of the MEMS member from increasing.

Since the size and inclination of the second reflective member are reduced, the optical member can be driven with low force. Additionally, the optical member can be miniaturized.

Additionally, the angle and distance of the first reflective member, the lens module, and the second reflective member are controlled. Accordingly, the optical loss of the optical member can be reduced and improved image quality can be achieved.

1 is a perspective view of an optical member according to an embodiment.

Figure 2 is an exploded perspective view of an optical member according to an embodiment.

Figure 3 is a perspective view of an optical module according to an embodiment.

Figure 4 is a perspective view of a reflective member of an optical module according to an embodiment.

Figure 5 is a cross-sectional view of a reflective member of an optical module according to an embodiment.

6 and 7 are cross-sectional views of an optical module according to an embodiment.

8 to 15 are diagrams for comparing an optical module according to an embodiment and an optical module according to a comparative example.

16 is a flowchart of a method of driving an optical member according to the first embodiment.

Figure 17 is a diagram for explaining the positions of the mirror and sensor portion of the optical member according to the embodiment.

Figure 18 is a flowchart of a method of driving an optical member according to the second embodiment.

Figure 19 is a diagram showing a wearable device to which an optical member according to an embodiment is applied.

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

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining and replacing. In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology. Additionally, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form may also include the plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and B and C”, it is combined with A, B, and C. It can contain one or more of all possible combinations. Additionally, when describing the components of an embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, sequence, or order of the component. And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also is connected to the other component. It may also include cases where other components are 'connected', 'coupled', or 'connected' by another component between them.

Additionally, when described as being formed or disposed "on top or bottom" of each component, top or bottom refers not only to cases where the two components are in direct contact with each other. It also includes cases where one or more other components are formed or disposed between two components. Additionally, when expressed as “up (above) or down (down),” it can include not only the upward direction but also the downward direction based on one component.

Meanwhile, each member described below has a vertical vector, optical axis, or extension line defined. The first vertical vector (V1) or an extension of the first vertical vector (V1) of the reflective member 400 is defined. The second vertical vector (V2) or an extension of the second vertical vector (V2) of the emitting member 500 is defined. The optical axis (OA) or an extension of the optical axis (OA) of the lens module is defined. An extension line E1 of the emitting member 500 and an extension line E2 of the second reflection member are defined. Here, the extension line E1 of the emitting member 500 is perpendicular to the second vertical vector V2. The extension line E2 of the second reflective member is perpendicular to the first vertical vector V1.

Hereinafter, an optical member according to an embodiment will be described with reference to FIGS. 1 to 5.

The optical member may be an optical member of a 3D display. The optical member may be applied to a display device. The optical member may be applied to a wearable display device. For example, the optical member may be applied to an augmented reality (AR) device. The optical member may be a projector.

Referring to FIGS. 1 and 2 , the optical member 10 includes a first housing 1100, a second housing 1200, and an optical module 2000. The first housing 1100 and the second housing 1200 each accommodate the optical module 2000.

The first housing 1100 accommodates the side portion of the optical module 2000. The first housing 1100 may surround the side of the optical module 2000.

The second housing 1200 accommodates the optical module 2000. The second housing 1200 accommodates the optical module 2000, the side of which is accommodated by the first housing 1100. The side portion of the optical module 2000 is accommodated by the first housing 1100. Additionally, the second housing 1200 may surround the front of the optical module. That is, the first housing 1100 and the optical module 2000 are accommodated by the second housing 1200.

The second housing 1200 includes an opening OA. The optical module 2000 is partially exposed by the opening 1200. That is, the emission member 700 of the optical module 2000 is coupled to the opening OA. Accordingly, light moving in the optical module 2000 moves to the outside of the optical member 10 through the emitting member 700.

The second housing 1200 includes three sides. In detail, the second housing 1200 includes a first side 1201S, a second side 1202S, and a third side 1203S. The third surface 1203S may include a protrusion P1. The second surface 1202S is disposed at an angle with respect to the first surface 1201S.

Figure 3 is a perspective view of the optical module 2000.

Referring to FIG. 3, the optical module 2000 includes a light source member 100, a lens module 200, a first reflective member 300, a second reflective member 400, an emitting member 500, and a plurality of circuits. Includes

members

610 and 620.

The circuit member includes a circuit board 610 and a driving member 620 on the circuit board 610. The circuit board 610 includes at least one printed circuit board of FPCB and PCB. The circuit board 610 supports at least one of the light source member 100, the lens module 200, the first reflective member 300, and the second reflective member 400. Alternatively, the circuit board 610 is connected to at least one of the light source member 100, the lens module 200, the first reflective member 300, and the second reflective member 400.

The driving member 620 may include various driving components such as a driving driver.

The light source member 100, the lens module 200, the first reflective member 300, the second reflective member 400, the emitting member 500, and the plurality of

circuit members

610, 620 It is accommodated in the first housing 1100 and the second housing 1200.

Light generated from the light source member 100 may sequentially move to the lens module 200, the first reflective member 300, the second reflective member 400, and the emitting member 500. That is, the light may be reflected, transmitted, or refracted in the lens module 200, the first reflective member 300, the second reflective member 400, and the emitting member 500.

The light source member 100 generates light. The light moves in the direction of the emitting member 500. The light may include laser light.

The light source member 100 emits light having at least one color. For example, the light source member 100 may emit light having one color. Alternatively, the light source member 100 may emit a plurality of lights having different colors.

For example, the light source member 100 may emit a plurality of lights having different colors. For example, the light source member 100 may emit red light, green light, and blue light. That is, the light source member 100 may be a laser package that emits laser light of multiple colors.

The light moves to the lens module 200. The light may travel directly to the lens module 200. Alternatively, the light may move indirectly to the lens module 200. For example, at least one reflective member may be disposed between the light source member 100 and the lens module 200. The reflective member may converge the light or change the path of the light. The light may be incident on the lens module 200 through the reflective member. For example, the reflective member may include a mirror or prism.

When the reflective member is additionally disposed, the angle formed between the straight line passing through the center of the light source member 100 and the optical axis of the lens module may be greater than 90° to 180° or greater than 120° to less than 150°.

Light emitted from the light source member 100 is incident on the lens module 200. That is, the lens module 200 is disposed in front of the emission surface of the light source member.

The light moves from the lens module 200 to the first reflective member 300.

The lens module 200 includes at least one lens. For example, the lens module 200 may include a plurality of lenses. For example, the lens module 200 may include three or more lenses spaced apart from each other and a lens barrel accommodating the lenses. In detail, the lens module 200 may include 3 to 6 lenses spaced apart from each other. At least one of the lenses may have a different material, size, or shape from other lenses. For example, the lens module 200 may include a first lens 210 and a second lens 220. The light emitted from the light source member 100 is incident on the first lens 210 . The light moves to the first reflective member 300 through the second lens.

Meanwhile, a portion of the second lens 220 may be disposed between the second reflection member 400 and the emitting member 500 in the direction of the second vertical vector (V2) of the emitting member 500. .

In addition, the center of the second lens 220 is aligned with the extension line E2 of the second reflection member 400 and the extension line of the emitting member 500 in the direction of the second vertical vector (V2) of the emitting member 500. It can be placed between (E1).

That is, the first lens 210 is disposed closest to the entrance part of the lens module 200. Additionally, the second lens 220 is disposed closest to the output portion of the lens module 200.

Accordingly, the distance between the second lens 210 and the emitting member 500 is smaller than the distance between the first lens 210 and the emitting member 500. In other words, the distance that light moves between the second lens 220 and the emitting member 500 is smaller than the distance that light moves between the first lens 210 and the emitting member 500.

In detail, based on the vertical vector direction of the emitting member 500, the distance between the optical axis of the second lens 220 and the extension line E1 of the emitting member 500 is equal to the optical axis of the first lens 210 It is smaller than the distance between the extension lines E1 of the emitting member 500.

The lens module 200 controls the exit angle of light moving in the direction of the first reflective member 300. In detail, the lens module 200 controls the exit angle of light moving outside the lens module 200. For example, the lens module 200 may be a relay lens that controls the exit angle of the light.

Since the emission angle of light is controlled from the lens module 200, the incident area of light incident on the emission member 500 is reduced. Accordingly, it is possible to prevent the size of the emission member from increasing due to an increase in the emission angle of the light.

Light emitted from the lens module 200 is incident on the first reflective member 300. The first reflection member 300 is disposed in front of the inclined surface of the lens module 200.

The first reflection member 300 may include a plurality of reflection parts. In detail, the first reflection member 300 includes a reflection part 310 and a light guide part 320. The reflection unit 310 and the light guide unit 320 may face each other. Additionally, the reflection unit 310 and the light guide unit 320 may be spaced apart from each other.

The first reflective member 300 may reflect or transmit the incident light depending on the angle of incidence of the incident light. That is, the first reflection member 300 may be a total reflection prism.

Light reflected from the first reflective member 300 moves to the second reflective member 400. The light reflected from the second reflective member 400 passes through the first reflective member 300 and moves to the emitting member 500.

The difference between the incident angle moving from the first reflecting member 300 to the second reflecting member 400 and the reflection angle reflecting from the second reflecting member 400 to the first reflecting member 300 is the first reflection. It is controlled by member 300. Accordingly, since the size of the second reflection member 400 is reduced, the performance of the optical module 10 is improved.

The first reflective member 300 will be described in detail below.

Light reflected from the first reflective member 300 is incident on the second reflective member 400. The second reflective member 400 faces the emission surface of the first reflective member 300. Additionally, the second reflective member 400 faces the reflective surface of the first reflective member 300.

Accordingly, the first reflecting member 300 is disposed between the second reflecting member 400 and the emitting member 500.

The second reflection member 400 includes a support part 410 and a mirror 420 disposed on the support part 410.

The support portion 410 includes a magnet that generates electromagnetic force. The mirror 420 is driven in horizontal and vertical directions by the electromagnetic force.

The mirror 420 can rotate in a first direction and a second direction. That is, the mirror 420 can rotate in two directions. Additionally, the mirror 420 reflects light while rotating in two directions. Accordingly, the second reflective member 400 can scan in the vertical and horizontal directions.

In detail, the second reflective member 400 receives light from the light source member 100, the lens module 200, and the first reflective member 300 and projects it in the horizontal and vertical directions. For example, the second reflection member 400 projects (horizontal scanning) synthesized light in a horizontal direction with respect to the first line. Then, it moves vertically to the second line (vertical scanning). Next, light is projected (horizontal scanning) in the horizontal direction on the second line. That is, the second reflective member 400 moves in the X-axis direction and the Y-axis direction. Additionally, scanning in the horizontal direction and the vertical direction is repeated. As a result, the second reflection member 400 can project an image onto the emitting member 500. In an embodiment, the second reflective member 400 may be a MEMS scanner. However, the embodiment is not limited to this. The second reflection member 400 may be a MEMS scanner, mirror, or prism.

Light scanned by the second reflection member 400 is incident on the emission member 500. The emitting member 500 may include glass. The emitting member 500 may be inserted into the opening OA.

The emitting member 500 faces the first reflecting member 400. For example, the emitting member 500 may face two inclined surfaces of the first reflecting member 400.

Although not shown in the drawing, a wave guide may be disposed outside the optical module 10. Light passing through the emitting member 500 may be reflected from the wave guide with the hologram attached. Accordingly, light may be incident on the eyes of a user wearing a display device including the optical module through the wave guide.

Hereinafter, with reference to FIGS. 4 and 5, the reflective member will be described in detail.

Referring to Figures 4 and 5, the first reflection member 300 includes a reflection part 310 and a light guide part 320. At least one of the reflection unit 310 and the light guide unit 320 includes a total reflection surface. The reflector 310 reflects light incident from the lens module 200 to the second reflection member 400. Additionally, the light guide unit 320 guides the light reflected from the second reflection member 400 to the emission member 500. As a result, the light reflected through the second reflective member 400 can pass through the first reflective member 300 and move to the emitting member 500.

At least one of the reflector 310 and the light guide unit 320 may include glass or plastic. The reflector 310 and the light guide unit 320 may include the same or different materials.

The angle between the first light LI1 emitted from the second reflection member 400 and the second light LI2 reflected from the second reflection member 400 is reduced by the reflection unit 310 . Accordingly, the size of the mirror 420 of the second reflection member 400 is reduced by the first reflection unit 510. Thereby, the force for driving the mirror 420 is reduced. Additionally, the size of the support portion 410 supporting the mirror 420 is also reduced. Accordingly, the size of the second reflective member 400 is reduced. Accordingly, the optical module can be miniaturized.

Additionally, the light emitted from the emitting member 500 moves in a parallel direction by the second reflecting member 400. Accordingly, the light incident on the emitting member 500 increases. Therefore, optical efficiency is improved.

The reflection unit 310 and the light guide unit 320 each include a plurality of surfaces. In detail, the reflector 310 and the light guide unit 320 include a plurality of surfaces through which light is incident, reflected, or emitted.

The reflector 310 includes a 1-1 side (1-1S), a 1-2 side (1-2S), and a 1-3 side (1-3S).

The 1-1 surface (1-1S) is the surface on which the light is incident. In detail, the 1-1 surface (1-1S) faces the second lens 220, which is the last lens among the lenses of the lens module 200. Light passing through the lens module 200 is incident on the 1-1 surface (1-1S). Light incident on the 1-1 surface (1-1S) moves to the 1-2 surface (1-2S).

The 1-2 surface 1-2S is a surface through which the light is reflected or transmitted. In detail, the 1-2 surface (1-2S) may reflect or transmit light depending on the incident angle of the light incident on the 1-2 surface (1-2S). That is, the 1-2 surface (1-2S) can be reflected when the incident angle incident on the 1-2 surface (1-2S) is greater than the critical angle, and can be transmitted when the incident angle is less than the critical angle. For example, the reflector 310 may be a total reflection prism.

Light incident from the 1-1 surface (1-1S) to the 1-2 surface (1-2S) is incident at an incident angle greater than the critical angle. Accordingly, the light incident on the 1-2 surface (1-2S) is reflected in the direction of the 1-3 surface (1-3S).

The 1-3 surface (1-3S) is the surface from which the light exits and enters. Light reflected from the 1-2 surface (1-2S) is incident on the 1-3 surface (1-3S). Light passing through the 1-3 surface 1-3S moves to the second reflective member 400. Additionally, the light reflected after scanning through the second reflective member 400 moves to the 1-3 surface 1-3S.

Light incident again on the 1-3 surface (1-3S) moves to the 1-2 surface (1-2S). Light incident on the 1-2 surface 1-2S is incident at an incident angle smaller than the critical angle. As a result, the light passes through the 1-2 surface 1-2S and moves to the light guide unit 320.

The light guide unit 320 includes a 2-1 side (2-1S) and a 2-2 side (2-2S).

The 2-1 surface 2-1S is a surface on which the light enters and exits. In detail, light passing through the 1-2 surface (1-2S) and moving to the second light guide unit 320 is incident on the 2-1 surface (2-1S). Additionally, the light moves to the 2-2 surface (2-2S).

The 2-2 surface 2-2S is a surface through which the light enters and exits. In detail, the light emitted from the 2-1 surface (2-1S) is incident on the 2-2 surface (2-2S). Additionally, it moves from the 2-2 surface (2-2S) to the emitting member 500.

The reflector 310 and the light guide unit 320 face each other. In detail, the reflection unit 310 and the light guide unit 320 include surfaces facing each other. In more detail, one surface of the reflection unit 310 faces one surface of the light guide unit 320. In more detail, the 1-2 surface (1-2S) of the reflection unit 310 faces the 2-1 surface (2-1S) of the light guide unit 320.

Additionally, the reflection unit 310 and the light guide unit 320 are spaced apart from each other. In detail, one surface of the reflection unit 310 is spaced apart from one surface of the light guide unit 320. In detail, the 1-2 surface (1-2S) is spaced apart from the 2-1 surface (2-1S).

The distance d1 between one surface of the reflection unit 310 and one surface of the light guide unit 320 may be 0.005 mm or more. In detail, the distance d1 may be 0.01 mm or more. In more detail, the distance d1 may be 0.02 mm or more. In more detail, the distance d1 may be 0.005 mm to 0.03 mm. In more detail, the distance d1 may be 0.01 mm to 0.03 mm.

If the distance d1 is less than 0.005 mm, the reflector 310 and the light guide unit 320 may collide due to errors or external impacts during the process.

Additionally, when the distance d1 is greater than 0.03 mm, the size of the optical module may increase.

That is, the 1-2 surface (1-2S) and the 2-1 surface (2-1S) face each other while being spaced apart from each other.

Additionally, the reflection unit 310 and the light guide unit 320 are arranged parallel to each other. In detail, one surface of the reflection unit 310 is parallel to one surface of the light guide unit 320. In detail, the 1-2 surface (1-2S) of the reflection unit 310 is parallel to the 2-1 surface (2-1S) of the light guide unit 320.

Additionally, one surface of the reflection unit 310 and one surface of the light guide unit 320 are arranged parallel to the second reflection member 400. In detail, the 1-2 surface (1-2S) and the 2-1 surface (2-1S) are parallel to the mirror 420. In more detail, the 1-2 surface (1-2S) and the 2-1 surface (2-1S) may be parallel to one surface of the mirror 420 before rotation.

Additionally, the 1-3 surface (1-3S) is parallel to the 2-2 surface (2-2S).

The reflector 310 and the light guide unit 320 have different sizes. In detail, the reflection unit 310 is larger than the light guide unit 320. In more detail, the length of the reflection unit 310 is longer than the length of the light guide unit 320.

Additionally, the length L1 of the 1-3 side (1-3S) has a set range. In detail, the length (L1) may be 0.5 mm or more. In more detail, the length L1 may be 1 mm or more. In more detail, the length L1 may be 2 mm or more. In more detail, the length L1 may be 3 mm or more. In more detail, the length L1 may be 0.5 mm to 4 mm.

If the length L1 is less than 0.5 mm, not all of the light reflected from the 1-2 surface 1-2S may be incident on the 1-3 surface 1-3S. Alternatively, not all of the light reflected from the second reflective member 400 may be incident on the 1-3 surface 1-3S.

Additionally, when the length L1 exceeds 4 mm, the size of the optical module 2000 may increase.

Additionally, the length L2 of the 2-2 surface 2-2S has a set range. In detail, the length (L2) may be 0.5 mm or more. In more detail, the length L2 may be 1 mm or more. In more detail, the length (L2) may be 2 mm or more. In more detail, the length L2 may be 3 mm or more. In more detail, the length (L2) may be 0.5 mm to 4 mm.

When the length (L2) is less than 0.5 mm, the light emitted from the 1-2 surface (1-2S) and the 2-1 surface (2-1S) is incident on the 2-2 surface (2-1S). 2S), not everyone may be hired.

Additionally, when the length L2 exceeds 4 mm, the size of the optical module 2000 may increase.

Additionally, the length L1 and the length L2 may be the same or different.

For example, the length L1 may be greater than the length L2. Accordingly, when light moves to the second reflective member 400, the light can move without light loss through the 1-3 surface 1-3S. Alternatively, when light is reflected from the second reflective member 400, the light may travel without light loss through the 1-3 surface 1-3S.

Alternatively, the length L2 may be greater than the length L1. Accordingly, when light moves to the emitting member 500 through the 2-2 surface 2-2S, the light can easily move even if the size of the emitting member 600 changes.

The first reflective member 300 may satisfy the following equation. In detail, the first reflective member 300 may satisfy at least one of the following equations.

[Equation 1]

1.3 ≤ nt_1 ≤ 2.1 or,

1.35 ≤ nt_1 ≤ 2.05 or.

1.4 ≤ nt_1 ≤ 2.0 or.

1.5 ≤ nt_1 ≤ 1.9

The nt_1 is the refractive index of light in the d-line (587.6nm) wavelength band of the reflector 310.

[Equation 2]

1.3 ≤ nt_2 ≤ 2.1 or,

1.35 ≤ nt_2 ≤ 2.05 or.

1.4 ≤ nt_2 ≤ 2.0 or.

1.5 ≤ nt_2 ≤ 1.9

The nt_2 is the refractive index of light in the d-line (587.6 nm) wavelength band of the light guide unit 320.

[Equation 3]

0 ≤ |nt_1 - nt_2| ≤ 0.01

The first reflective member 300 may satisfy Equations 1 to 3. Therefore, when light moves to the emitting member through the reflector 310 and the light guide unit 320, light loss due to a difference in refractive index between the first reflector and the second reflector can be prevented.

[Equation 4]

θ1 = θ2 = θ3

The θ1 is the angle formed by the 1-1 surface (1-1S) and the 1-2 surface (1-2S). The θ1 is the angle formed by the long side of the 1-1 surface and the long side of the 1-2 surface (1-2S). The θ2 is the angle formed by the 1-2 surface (1-2S) and the 1-3 surface (1-3S). The θ2 is the angle formed by the long side of the 1-2 surface (1-2S) and the long side of the 1-3 surface (1-3S). The θ3 is the angle formed by the 2-1 surface (2-1S) and the 2-2 surface (2-2S). The θ3 is the angle formed between the long side of the 2-1 surface (2-1S) and the long side of the 2-2 surface (2-2S).

The first reflective member 300 may satisfy Equation 4. Accordingly, it is possible to prevent chromatic aberration from occurring inside the first reflective member 300. Accordingly, the display can have improved image quality.

[Equation 5]

|Lθ1| = |Lθ2| ego,

Lθ1 < Lθ2 - 6 < Lθ2 < Lθ2 + 6

The Lθ1 is the angle between the light emitted from the 1-3 surface (1-1S) and incident on the second reflective member 400 and the vertical vector of the second reflective member 400. The Lθ2 is the angle between the light reflected from the second reflective member 400 and incident on the 1-3 surface (1-1S) and the vertical vector of the second reflective member 400.

[Equation 6]

0° < |Lθ1| + |Lθ2| < 12°

The first reflective member 300 may satisfy Equations 5 and 6. Accordingly, the light emitted from the 1-3 surface (1-1S) and incident on the second reflective member 400 is reflected from the second reflective member 400 to the 1-3 surface (1-1S). ) can be separated.

Additionally, the size of the second reflective member 400 may be reduced. That is, the size of the mirror 420 can be reduced. Accordingly, the weight of the second reflective member 400 is reduced, so the driving efficiency of the second reflective member 400 is improved. Additionally, the optical module is miniaturized.

[Equation 7]

When 1.45 < nt_1 < 1.55,

4 < Lθ3

Lθ3 is when the light reflected from the second reflection member 400 is incident on the 1-3 surface (1-3S), the light emitted from the 1-3 surface (1-1S) and the first -3 It is the angle of the vertical vector of the plane (1-1S).

[Equation 8]

When 1.65 < nt_1 < 1.75,

3.5 < Lθ3

[Equation 9]

When 1.85 < nt_1 < 1.95,

3.2 < Lθ3

The first reflective member 300 may satisfy Equation 7 to Equation 9. Therefore, the light reflected by the second reflection member 400, refracted at the 1-3 surface (1-3S), and incident on the 1-2 surface (1-2) is transmitted to the 1-2 surface (1-2). It is not totally reflected in (1-2) and can move in the direction of the light guide unit 320.

[Equation 10]

25° ≤ CR_1-2S ≤ 43° or,

28° ≤ CR_1-2S ≤ 41°

CR_1-2S is the critical angle of the 1-2 surface (1-2S).

[Equation 11]

Lθ4 = θ2 + Lθ3

Lθ4 is the angle between the light emitted from the 1-2 surface (1-2S) and the vertical vector of the 1-2 surface (1-2S).

[Equation 12]

Lθ5 = θ2 - Lθ3

Lθ5 is the angle between the light reflected from the second reflection member 400 and incident on the 1-2 surface (1-2S) and the vertical vector of the 1-2 surface (1-2S).

[Equation 13]

32 ≤ θ2 ≤ 52 or,

36 ≤ θ2 ≤ 48 or,

40 ≤ θ2 ≤ 44 or,

41.5 ≤ θ2 ≤ 42.5

The first reflective member 300 may satisfy Equations 11 to 13. Accordingly, the size of the first reflective member 300 is reduced. Additionally, all light can move within the first reflective member 300. Additionally, light incident on the second reflective member 400 may be reflected on the 1-2 surface 1-2S. Additionally, light reflected from the second reflective member 400 may be transmitted through the 1-2 surface 1-2S.

[Equation 14]

20°< θ _400-TIR < 50°

θ _400-TIR is the angle between the optical axis of the lens of the lens module and the vertical vector of the 1-2 surface (1-2S).

The first reflective member 300 may satisfy Equation 14. Accordingly, the light incident from the lens module is not transmitted through the 1-2 surface 1-2S, but is totally reflected in the direction of the second reflection member 400.

The first reflective member 300 may satisfy at least one of Equations 1 to 14. In detail, the first reflective member 300 may satisfy all of Equations 1 to 14.

Accordingly, the size of the second reflective member is reduced. Therefore, the optical member 10 can be miniaturized. In addition, clear image quality can be created by correcting aberration of light emitted from the optical module 2000. Additionally, the driving force of the second reflective member decreases. Therefore, the optical module can be driven with low power. Accordingly, the driving time and lifespan of the display device are improved.

6 and 7 are cross-sectional views of a portion of an optical module according to an embodiment.

Referring to Figures 6 and 7, the vertical vector, optical axis, or extension line of each member is defined. In detail, the second vertical vector (V2) or an extension of the second vertical vector (V2) of the emitting member 500 is defined. Additionally, the first vertical vector (V1) or an extension of the first vertical vector (V1) of the second reflection member 400 is defined. Additionally, the optical axis (OA) or an extension of the optical axis (OA) of the lens module is defined. Additionally, an extension line E1 of the emitting member 500 and an extension line E2 of the second reflection member are defined. The extension line E1 of the emitting member 500 is perpendicular to the second vertical vector V2. The extension line E2 of the second reflective member is perpendicular to the first vertical vector V1.

Referring to FIGS. 6 and 7 , the first reflective member 300 is spaced apart from at least one of the lens module 200, the second reflective member 400, and the emitting member 500.

The first reflection member 300 is spaced apart from the lens module 400.

The distance d2 between the first reflective member 300 and the lens module 200 is different from the distance d1 between one surface of the reflector 310 and one surface of the light guide unit 320. In detail, the distance d2 is greater than the distance d1.

In detail, the distance d2 may be 0.1 mm or more. In more detail, the distance d2 may be 0.3 mm or more. In more detail, the distance d2 may be 0.1 mm to 0.5 mm. In more detail, the distance (d2) may be 0.2 mm to 0.3 mm.

The distance d2 is the minimum distance from the reflector 310 to the center of the second lens 220, which is the last lens of the lens module 200.

If the distance d2 is less than 0.1 mm, the first reflective member 300 and the lens module 200 may contact due to an error during the process. also. When an impact is applied to the optical member 10 from the outside, the first reflective member 300 and the lens module 200 may collide due to the impact.

If the distance d2 is greater than 0.5 mm, the distance between the first reflection member 300 and the lens module 200 increases unnecessarily. Accordingly, the size of the optical module can be increased.

The first reflective member 300 and the second reflective member 400 are spaced apart.

The distance d3 between the first reflective member 300 and the second reflective member 400 may be different from the distance d1. In detail, the distance d3 is greater than the distance d1.

In detail, the distance d3 may be 0.1 mm or more. In more detail, the distance d3 may be 0.4 mm or more. In more detail, the distance d3 may be 0.1 mm to 0.6 mm. In more detail, the distance d3 may be 0.3 mm to 0.5 mm.

The distance d3 is the minimum distance from the reflector 310 to the center of the second reflection member 400.

When the distance d3 is less than 0.1 mm, the first reflective member 300 and the second reflective member 400 may contact due to an error during the process. also. When an impact is applied to the optical member 10 from the outside, the first reflective member 300 and the second reflective member 400 may collide due to the impact.

When the distance d3 is greater than 0.6 mm, the distance between the first reflective member 300 and the second reflective member 400 increases unnecessarily. Accordingly, the size of the optical module can be increased.

The first reflecting member 300 is spaced apart from the emitting member 500.

The distance d4 between the first reflecting member 300 and the emitting member 500 may be 0.03 mm or more. In detail, the distance d4 may be 0.05 mm or more. In more detail, the distance d4 may be 0.03 mm to 0.08 mm. In more detail, the distance d4 may be 0.06 mm to 0.07 mm.

The distance d4 is the minimum distance between the first reflecting member 300 and the emitting member 500.

The process of setting the distance (d4) to less than 0.05 mm may be difficult. Additionally, when the distance d4 is less than 0.05 mm, the first reflective member 300 and the emitting member 500 may contact due to an error during the process. also. When an impact is applied to the optical member 10 from the outside, the first reflection member 300 and the emitting member 500 may collide due to the impact.

If the distance d4 is greater than 0.08 mm, the distance between the first reflection member 300 and the emitting member 500 increases unnecessarily. Accordingly, the size of the optical module can be increased.

The second reflective member 400 is disposed at an angle. In detail, the second reflection member 400 is inclined toward the emitting member 500. The inclination of the second reflecting member 400 is the angle between the second reflecting member 400 and the emitting member 500. In detail, the first vertical vector V1 of the second reflective member 400 is defined. Additionally, a second vertical vector (V2) of the emitting member 500 is defined. The inclination of the second reflective member 400 is the angle between the first vertical vector (V1) and the second vertical vector (V2).

The angle between the first vertical vector (V1) and the second vertical vector (V2) has a set size.

The angle θ4 between the first vertical vector V1 and the second vertical vector V2 may be 10° or more. In detail, the angle θ4 may be 20° or more. In more detail, the angle θ4 may be 10° to 30°. In more detail, the angle θ4 may be 15° to 20°.

Additionally, the second reflection member 400 is inclined toward the emitting member 500 in the above angle range. Additionally, the incident light and reflected light of the second reflective member 400 satisfy Equation 6 above.

The second reflective member 400 is disposed at an angle within a set range. Accordingly, light incident from the first reflective member 300 to the second reflective member 400 is reflected by the second reflective member 400. Additionally, the reflected light is incident on the first reflective member 300. That is, the first reflective member 300 is disposed between the lens module 200 and the second reflective member 400. The light reflected from the second reflecting member 400 passes through the first reflecting member 300 by the first reflecting member even if the second reflecting member 400 is tilted at a small angle and is emitted by the emitting member ( 500), you can be hired stably.

The second reflective member 400 is inclined at a small angle. Accordingly, the second reflective member 400 can be prevented from contacting the first reflective member 300 and the second housing 1200. Additionally, the second surface 1202S of the second housing is inclined at a certain angle with respect to the first surface 1201S of the second housing. The angle between the first surface 1201S and the second surface 1202S is greater than 110° and less than 130°.

The second reflective member 400 is spaced apart from the second housing 1200.

The distance d5 between the second reflection member 400 and the second housing 1200 may be 0.7 mm or more. In detail, the distance d5 may be 0.9 mm or more. In more detail, the distance d5 may be 0.7 mm to 1.2 mm. In more detail, the distance d5 may be 1.0 mm to 1.1 mm.

The distance d5 is the distance from the center of the second reflection member 400 to the inner surface of the second housing 1200.

If the distance d5 is less than 0.7 mm, the second reflection member 400 and the second housing 1200 may contact due to an error during the process. also. When an impact is applied to the optical member 10 from the outside, the second reflection member 400 and the second housing 1200 may collide due to the impact.

When the distance d5 is greater than 1.2 mm, the distance between the second reflection member 400 and the second housing 1200 increases unnecessarily. Accordingly, the size of the optical module can be increased.

The lens module 200 is disposed at an angle. In detail, the lens module 200 is tilted in the direction of the emitting member 500. The inclination of the lens module 200 is the angle between the lens module 200 and the emitting member 500. In detail, the second vertical vector V2 of the emitting member 500 is defined. Additionally, the optical axis (OA) of the lens module 200 is defined. The inclination of the lens module 200 is the angle between the extension line of the second vertical vector (V2) and the extension line of the optical axis (OA).

The angle between the second vertical vector (V2) and the optical axis (OA) has a set size.

The angle θ5 between the second vertical vector V2 and the optical axis OA may be 50° or more. In detail, the angle θ5 may be 55° or more. In more detail, the angle θ5 may be 50° to 70°. In more detail, the angle θ5 may be 58° to 63°.

When the angle θ5 is 50° or less, the first lens 210, which makes light emitted from the light source member 100 incident on the lens module 200, is on the third surface 1203S of the second housing. become distant from Accordingly, the size of the optical module 2000 increases.

When the angle θ5 is greater than 70°, the first lens 210 is disposed very close to the third surface 1203S of the second housing. Accordingly, the space for arranging the light source member 100 becomes narrow. Therefore, it becomes difficult to assemble the light source member 100.

At least one reflective member (not shown) may be further disposed between the first lens 210 and the light source member 100. The reflective member may reflect light emitted from the light source member 100 to the first lens 210 . When the angle θ5 is greater than 70°, the first lens 210 is disposed very close to the third surface 1203S of the second housing. Accordingly, the space for arranging the reflective member becomes narrow. Therefore, it becomes difficult to assemble the reflective member (not shown).

The optical axis OA of the lens module 200 and the second reflective member 400 have an angle within a set range.

The angle θ6 between the optical axis OA of the lens module 200 and the first vertical vector V1 of the second reflective member 400 may be 90° or less. In detail, the angle θ6 may be 80° or less. In more detail, the angle θ6 may be 70° to 105°. In more detail, the angle θ6 may be 75° to 98°.

When the angle θ6 is less than 70° or more than 105°, light emitted from the lens module 200 is reflected by the first reflection member 300. Accordingly, light incident on the second reflective member 400 and light reflected may overlap with each other.

When (θ6) is less than 70°, the first lens 210 moves away from the third surface 1203S of the second housing. Accordingly, the size of the optical module 2000 increases. When (θ6) exceeds 105°, the first lens 210 is disposed very close to the third surface 1203S of the second housing. Accordingly, the space for arranging the light source member 100 or the reflective member (not shown) becomes narrow. Accordingly, it becomes difficult to assemble the light source member 100 and the reflective member (not shown).

In order to place the lens module 200 that satisfies the angle range, the third surface 1203S of the second housing includes a protrusion P1. The protrusion P1 protrudes outward from the emitting member 500 . The protrusion P1 protrudes further outward than the emitting member 500 .

The lens module 200 and the emitting member 500 are spaced apart from each other at a set distance. In detail, the distance d6 between the lens module 200 and the emitting member 500 is the minimum distance between the lens module 200 and the emitting member 500 in the first vertical vector direction.

The distance d6 may be 0.8 mm or more. In detail, the distance d6 may be 0.9 mm or more. In more detail, the distance d6 may be 0.8 mm to 1.2 mm. In more detail, the distance d6 may be 0.9 mm to 1.1 mm.

Hereinafter, with reference to FIGS. 8 to 15, an optical module including the reflective member and an optical module not including the reflective member will be described.

Referring to Figures 8 and 13, the optical module includes a reflective member. The second lens 220 is disposed closer to the emitting member 500 than the first lens 210.

A first reflective member 300 is disposed between the lens module 200 and the second reflective member 400. Accordingly, assembly of internal components becomes easy while maintaining the performance of the optical module. Additionally, the optical module is miniaturized.

When the first lens 210 of the lens module 200 moves away from the emitting member 500, the performance of the optical module is maintained. Additionally, assembly becomes easier and miniaturization occurs. That is, the first lens 210 must be arranged so as not to face the emitting member 500.

The first lens 210 is disposed close to the light source member 100. When the first lens 210 and the emitting member 500 are adjacent to each other, the space in which the reflecting member is disposed becomes narrow. Accordingly, assembly of the optical module becomes difficult.

That is, when the first lens 210 is disposed toward the emitting member 500, the light source member 100 or the reflecting member is disposed between the first lens 210 and the emitting member 500. . Therefore, as the constraints increase, assembly is not easy. In particular, it must be assembled so that light can enter the lens module 200 without contacting the emitting member 500. Therefore, assembling conditions increase and assembly becomes difficult.

On the other hand, when the first lens 210 and the emitting member 500 are separated, the light source member 100 or an additional reflective member is not disposed between the emitting member 500 and the lens module 200. No. Therefore, assembly becomes easier.

That is, when the distance between the emitting member 500 and the first lens 210 is greater than the distance between the emitting member 500 and the second lens 220, the light source member 100 or the additional reflecting member is not disposed between the emitting member 500 and the lens module 200. Therefore, assembly becomes easier.

That is, when the first lens 210 is arranged not to face the emitting member 500, the light source member 100 or an additional reflecting member is disposed between the emitting member 500 and the lens module 200. It doesn't work. Therefore, assembly becomes easier.

When a reflective member is disposed between the lens module 200 and the second reflective member 400 as shown in FIGS. 8 and 13, the first lens 210 may be disposed so as not to face the emitting member 500. You can.

FIGS. 9, 10, and 14 are diagrams illustrating cases where the lens module is arranged without a reflective member. Referring to FIG. 9, it is designed so that the light source member cannot be placed. Referring to FIGS. 10 and 14 , the light source member or reflection member is disposed between the emitting member 500 and the lens module 200. Therefore, assembly is not easy. Therefore, the optical module is miniaturized, but assembly is not easy.

FIGS. 11, 12, and 15 are diagrams illustrating a case in which the lens module 200 is arranged not to face the emitting member without a reflective member. Referring to FIGS. 11, 12, and 15, even if the reflective member is not disposed, the distance between the emitting member 500 and the first lens 210 is the same as the distance between the emitting member 500 and the second lens 220. It can be placed farther than the distance of . Accordingly, the light source member 100 or the additional reflective member may be arranged so as not to be adjacent to the emitting member 500. Therefore, assembly may be easy. However, the optical module is not miniaturized. That is, if the reflective member is not disposed and the lens module 200 is disposed not to face the emitting member 500, the distance between the lens module 200 and the emitting member 500 becomes distant. Therefore, the optical module is not miniaturized.

That is, since the first reflective member 300 is disposed between the second reflective members, assembly is facilitated while maintaining the performance of the optical module. Additionally, the optical member is miniaturized.

Meanwhile, the second reflective member 400 is inclined at a set angle between the first vertical vector (V1) and the second vertical vector (V2). Additionally, the lens module 200 is tilted at a set angle between the second vertical vector (V2) and the optical axis (OA).

That is, the optical module according to the embodiment arranges the first reflective member 300 between the lens module 200 and the second reflective member 400. Accordingly, both the tilt angles of the second reflection member 400 and the lens module 200 can be satisfied.

Referring to FIG. 10 that does not include the first reflective member 300, the tilt angle of the second reflective member 400 is satisfactory. However, the tilt angle of the lens module 200 is not satisfactory.

Referring to FIG. 12 that does not include the first reflection member 300, the tilt angle of the lens module 200 is satisfactory. However, the tilt angle of the second reflective member 400 is not satisfactory.

When both the tilt angles of the second reflective member 400 and the lens module 200 are satisfied, overlapping of light incident on the second reflective member 400 and light reflected can be prevented. As a result, the optical module can maintain improved resolution. Additionally, assembly of the optical member becomes easy. Additionally, the optical member is miniaturized.

The optical performance of the optical member is to display a clear screen. That is, the optical performance is to minimize light loss, aberration, and distortion characteristics when light generated from the light source member is emitted to the emitting member 500. As a result, light can be transmitted to the emitting member without noise.

If the angle of the second reflection member 400 is out of the range, the angle of the lens module 200 is also out of the range. Accordingly, the emission member and the lens module are disposed close to each other. Accordingly, the space for arranging the light source member or the additional reflective member becomes narrow. Therefore, assembly of the optical module becomes very difficult. Additionally, the emitting member and the lens module become very far apart. Therefore, the optical member is not miniaturized.

The angle and distance between the lens module 200 and the emitting member 500 are conditions for performance, ease of assembly, and miniaturization of the optical member.

Referring to FIG. 10, the shortest distance between the emitting member 500 and the second lens 220 is satisfied. However, the angle between the lens module 200 and the emitting member 500 is not satisfactory. Accordingly, the optical module can be miniaturized. However, assembly becomes difficult.

Referring to FIG. 12, the angle between the lens module 200 and the emitting member 500 is satisfied. However, the shortest distance between the emitting member 500 and the second lens 220 is not satisfactory. Accordingly, assembly of the optical module becomes easier. However, miniaturization becomes difficult.

That is, only when the first reflective member 300 is disposed between the lens module 200 and the second reflective member 400, the lens module and the emission member satisfy the inclination angle condition and the distance condition. do. Therefore, the optical module can be miniaturized and easily assembled.

When the shortest distance between the emitting member 500 and the second lens 220 is outside the range, the distance between the emitting member and the lens module becomes closer. Therefore, assembly and miniaturization of the optical module become difficult.

Hereinafter, a method of driving an optical member will be described with reference to FIGS. 16 to 18.

The optical member includes a MEMS scanner that rotates in horizontal and/or vertical directions. If the MEMS scanner does not rotate in a desired direction or size, the characteristics of light moving to the emitting member change. For example, light traveling to the emitting member may not be diffused to a sufficient size. Alternatively, the intensity of light may be concentrated in a specific area. Accordingly, the user's vision may be reduced by the light.

Below, a method of driving an optical member that can solve the above problems will be described.

16 is a flowchart of a method of driving an optical member according to the first embodiment. For example, Figure 16 is a flowchart of a method of driving a projector.

The method of driving the optical member includes turning on the power of the projector (ST10), applying current to the actuator (ST20), sensing the output waveform of the mirror by the sensor unit (ST30), and comparing the input waveform and the output It includes a step of comparing waveforms (ST40).

First, turn on the power of the projector 1000. When the projector 1000 is turned on, light is emitted from the light source member 100. In detail, a laser is emitted from the light source member 100. In more detail, light including red light, green light, and blue light is emitted from the light source member 100.

Light emitted from the light source member 100 passes through the lens module 200, is reflected by the reflecting

members

300 and 400, and moves to the emitting member 500.

Next, a current within a set range is applied to the projector 1000. In detail, a current to rotate the reflective member 300 is applied. Thereby, current is applied to the actuator. A current within a set range is applied to the actuator. In detail, a reference waveform for rotating the mirror 320 is set before applying current to the actuator. For example, the reference waveform may be a waveform in which the mirror 320 is torsional driven. That is, the reference waveform becomes the input waveform. The input waveform is then compared with the output waveform sensed by the sensor unit.

A current of a magnitude capable of generating the reference waveform is applied to the actuator.

Next, the sensor unit senses the driving of the mirror. Referring to FIG. 17, the sensor unit 330 is disposed adjacent to the mirror 320. The sensor unit 330 includes a first sensor unit 331 disposed at the top and a second sensor unit 332 disposed at the bottom. The first sensor unit 331 and the second sensor unit 332 sense the movement of the mirror 320 driven by the actuator. In detail, the first sensor unit 331 and the second sensor unit 332 sense a change in the position of the mirror 320. The first sensor unit 331 and the second sensor unit 332 may include a PZR sensor.

Accordingly, the sensor unit 330 can form an output waveform according to the applied current.

Next, the input waveform and the output waveform are compared. The input waveform is the reference waveform. That is, the input waveform is a waveform in which the mirror 320 is torsional driven. Additionally, the output waveform is a waveform obtained by sensing the mirror 320 moved by the actuator by the sensor unit 330.

It is determined whether the input waveform and the output waveform match by comparing the input waveform and the output waveform.

When the input waveform and the output waveform match, the projector maintains the on state.

If the input waveform and the output waveform do not match, the difference between the input waveform and the output waveform is checked. If the difference between the input waveform and the output waveform is less than 200 codes, the projector is maintained in the on state. If the difference between the input waveform and the output waveform is 200 codes or more, the projector is turned off.

When the difference between the input waveform and the output waveform is 200 codes or more, the intensity of light reflected from the

reflective members

300 and 400 may be concentrated in a local area. This may affect the user's vision.

Next, a method of driving an optical member according to the second embodiment will be described with reference to FIG. 18.

The projector driving method according to the second embodiment includes the steps of turning on the power of the projector (ST10), applying current to the actuator (ST20), having the sensor unit sense the output waveform of the mirror (ST30), and inputting the output waveform of the mirror (ST30). It includes comparing the waveform and the output waveform (ST40), checking the difference between the input waveform and the output waveform (ST50), and correcting the difference between the input waveform and the output waveform (ST50).

The light emitted from the light source member 100 passes through the lens module 200, is reflected by the reflecting

members

300 and 400, and moves to the emitting member 500.

Next, the sensor unit senses the driving of the mirror. In detail, the movement of the mirror 320 driven by the actuator is sensed through the sensor unit 330. In detail, the change in position of the mirror 320 is sensed.

Accordingly, the sensor unit 330 forms an output waveform according to the applied current.

Next, the input waveform and the output waveform are compared. The input waveform may be the reference waveform. That is, the input waveform may be a waveform in which the mirror 320 is torsional driven. Additionally, the output waveform is a waveform obtained by sensing the mirror 320 moved by the actuator by the sensor unit 330.

By comparing the input waveform and the output waveform, it is determined whether the input waveform and the output waveform match.

If the input waveform and the output waveform do not match, the difference between the input waveform and the output waveform is checked. If the difference between the input waveform and the output waveform is less than 200 codes, the projector is maintained in the on state. If the difference between the input waveform and the output waveform is 200 codes or more, the difference between the input waveform and the output waveform is corrected.

In the step of correcting the difference between the input waveform and the output waveform, the driving force of the actuator is changed. For example, the movement of the mirror can be increased by increasing the driving force of the actuator. Alternatively, the movement of the mirror can be reduced by reducing the driving force of the actuator.

Alternatively, in the step of correcting the difference between the input waveform and the output waveform, the frequency of the mirror is changed. That is, the frequency of the mirror can be increased or decreased.

When the difference between the input waveform and the output waveform is corrected to less than 200 codes, the projector is maintained in the on state. In addition, when the difference between the input waveform and the output waveform is maintained at 200 codes or more, the projector is turned off.

When the difference between the input waveform and the output waveform is 200 codes or more, the intensity of light reflected from the reflective member 300 may be concentrated in a local area. This may affect the user's vision.

The method of driving the optical member can protect the user's eyesight.

In detail, the projector senses the movement of the mirror through an actuator. If an error occurs in the movement of the mirror, the projector can be turned off. If the mirror operates differently from the set movement, light reflected through the reflective member may be concentrated in a local area.

When the light reflected from the reflective member is concentrated in one area, light of strong intensity may be transmitted to the user's eyes. This may affect the user's vision.

Therefore, if an error occurs in the movement of the mirror, the projector is turned off. Accordingly, the user's eyesight can be protected.

Additionally, if an error occurs in the movement of the mirror, the movement of the mirror is corrected. Accordingly, the user can sense and correct the movement of the mirror while using the projector.

Accordingly, the user's convenience is increased because the projector is not turned off immediately.

Hereinafter, with reference to FIG. 19. A display device including the optical member 10 according to an embodiment will be described.

Referring to FIG. 19, the optical member 10 is applied to a wearable display device. In detail, the wearable display device can be worn on the head or ears of the human body.

For example, the display device 3000 may be an augmented reality device.

The display device 3000 includes a wearable unit 3100, an optical member 10, and a display unit 3200.

The wearing portion 3100 extends in one direction. The wearing unit 3100 can be worn on the user's body. For example, the wearing unit 3100 is worn on the user's head or ear. Accordingly, the display device 3000 is fixed to the user's body.

The optical member 10 is connected to the wearing part 3100. The optical member 10 is adjacent to the display unit 3200. The optical member 10 transmits light with an image scanned in the direction of the display unit 3200. Additionally, light passing through the display unit 3200 is transmitted to the user's eyes.

Accordingly, the user perceives augmented reality through the optical member.

The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the above description has been made focusing on the examples, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiment. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

Claims

housing;

a lens module disposed within the housing;

a first reflective member that reflects light emitted from the lens module;

a second reflective member that reflects light reflected from the first reflective member; and

An emitting member through which light reflected from the second reflecting member is emitted,

An optical member in which light reflected through the second reflective member passes through the first reflective member and moves to the emitting member.
According to claim 1,

The first reflective member includes a reflector and a light guide,

The reflector reflects light emitted from the lens module to the second reflection member,

The light guide part is an optical member that guides the light reflected from the second reflection member to the emitting member.
housing;

a lens module disposed within the housing;

a first reflective member that reflects light emitted from the lens module;

a second reflective member that reflects light reflected from the first reflective member; and

An emitting member through which light reflected from the second reflecting member is emitted,

The light reflected from the second reflecting member passes through the first reflecting member and moves to the emitting member,

An optical member wherein an angle between an extension of the optical axis of the lens module and a vertical vector of the second reflective member is 70° to 105°.
According to claim 3,

An optical member wherein the angle between the extension of the optical axis of the lens module and the vertical vector of the second reflective member is the angle between the lens module and the second reflective member.
housing;

a light source member disposed within the housing;

a lens module disposed in front of the light source device;

a first reflection member disposed in front of the emission surface of the lens module;

an emission member facing the emission surface of the first reflection member; and

It includes a second reflective member facing the reflective surface of the first reflective member,

The first reflective member is an optical member disposed between the second reflective member and the emitting member.
According to clause 5,

An optical member further comprising a reflective member disposed between the light source member and the lens module.
In clause 6

An optical member wherein the angle between a straight line passing through the center of the light source member and the optical axis of the lens module is greater than 90° and less than 180°.
housing;

a light source member and a lens module disposed within the housing;

a first reflective member that reflects light emitted from the lens module;

a second reflective member that reflects light reflected from the first reflective member; and

An emitting member through which light reflected from the second reflecting member is emitted,

The lens module includes a first lens into which light emitted from the light source member is incident; and a second lens transmitting the light to the second reflective member,

The distance between the optical axis of the second lens and the extension line of the emitting member is disposed closer than the distance between the optical axis of the first lens and the extending line of the emitting member,

The distances are in a vertical vector direction of the light emitting member.
According to clause 8,

The extension line of the second reflective member is a line extending in a direction perpendicular to the vertical vector of the second reflective member,

An optical member wherein the extension line of the emitting member is a line extending in a direction perpendicular to the vertical vector of the emitting member.
According to clause 8,

The optical axis of the lens module is inclined at an inclination angle of 50° to 70° with respect to the vertical vector direction of the emitting member,

The minimum distance between the emitting member and the second lens is 0.8 mm to 1.2 mm,

The minimum distance is an optical member in a vertical vector direction of the emitting member.