CN213365189U - Optical assembly and head-mounted display device with same - Google Patents

Abstract

The utility model discloses an optical assembly and head-mounted display device who has it, optical assembly includes: the spectroscope is provided with a light incident surface and a light emergent surface; the polarizer assembly is arranged on a light outgoing surface of the spectroscope and comprises a polarizer body and a polarization reversing piece, the polarization reversing piece is located between the spectroscope and the polarizer body, the polarizer body is used for converting external light into first linearly polarized light, the first linearly polarized light is emitted to the spectroscope after passing through the polarization reversing piece, the spectroscope reflects part of received light to the polarization reversing piece, the reflected light is converted into second linearly polarized light by the polarization reversing piece, and the polarization direction of the second linearly polarized light is different from that of the first linearly polarized light. The utility model discloses an optical assembly can weaken the picture and overlap the effect, promotes user's visual experience.

Description

Optical assembly and head-mounted display device with same

Technical Field

The utility model belongs to the technical field of the technique of wearable electronic product and specifically relates to a display device is worn to optical assembly and have it.

Background

The optical assembly for the head-mounted display equipment in the related technology easily enables external light in the environment where the head-mounted display equipment is located to be reflected to eyes of a user through the spectroscope, so that pictures are overlapped, and the visual experience of the user is poor.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide an optical assembly, which can weaken the image overlapping effect and improve the visual experience of the user.

The utility model also provides a wear display device, including foretell optical assembly.

According to the utility model discloses optical assembly, include: the spectroscope is provided with a light incident surface and a light emergent surface; the polarizer assembly is arranged on a light outgoing surface of the spectroscope and comprises a polarizer body and a polarization reversing piece, the polarization reversing piece is located between the spectroscope and the polarizer body, the polarizer body is used for converting external light into first linearly polarized light, the first linearly polarized light is emitted to the spectroscope after passing through the polarization reversing piece, the spectroscope reflects part of received light to the polarization reversing piece, the reflected light is converted into second linearly polarized light by the polarization reversing piece, and the polarization direction of the second linearly polarized light is different from that of the first linearly polarized light.

According to the utility model discloses optical assembly, through setting up polarizer subassembly, make polarizer subassembly establish the play plain noodles at the spectroscope, polarizer subassembly includes polaroid body and polarisation switching-over piece, polarisation switching-over piece is located between spectroscope and the polaroid body, the polaroid body is used for converting external light into first linearly polarized light, first linearly polarized light is directive spectroscope behind the polarisation switching-over piece, the spectroscope is to the received partial light of polarisation switching-over piece reflection, the light of reflection is the second linearly polarized light at the polarisation switching-over piece conversion, the polarization direction of second linearly polarized light is different with the polarization direction of first linearly polarized light. From this, can reduce through the spectroscope reflection to wearing the external light in the user's of wearing display device's the eyes to can reduce the influence of external light to the virtual image quality who shows in wearing display device, the overlapping effect of weakening picture, promote user's visual experience.

According to some embodiments of the invention, the polarization direction of the first linearly polarized light is perpendicular to the polarization direction of the second linearly polarized light.

According to some embodiments of the present invention, the polarizing commutator is a retardation compensation film.

According to some embodiments of the utility model, optical assembly still includes the concave mirror, the concave mirror is located keeping away from of spectroscope one side of polaroid subassembly and orientation are kept away from one side of spectroscope is sunken, the optical axis of concave mirror with the income plain noodles of spectroscope becomes the contained angle setting.

In some embodiments of the present invention, the included angle is 30 ° to 55 °.

In some embodiments of the present invention, the included angle is 45 °.

In some embodiments of the present invention, the concave mirror and the spectroscope are provided with a semi-transparent and semi-reflective film on their surfaces close to each other.

In some embodiments of the present invention, the optical assembly further includes an image light source, the image light source is located between the spectroscope and the concave mirror, and the image light source can face the incident surface of the spectroscope to emit an imaging light beam.

According to some embodiments of the utility model, the relative both sides of polarisation switching-over piece are glued through pressure-sensitive adhesive respectively the polaroid body with on the spectroscope.

According to the utility model discloses head-mounted display equipment, include according to the utility model discloses the optical assembly of above-mentioned embodiment.

According to the utility model discloses head-mounted display equipment is through setting up the basis the utility model discloses the optical assembly of above-mentioned embodiment. From this, can reduce through the spectroscope reflection to wearing the external light in the user's of wearing display device's the eyes to can reduce the influence of external light to the virtual image quality who shows in wearing display device, the overlapping effect of weakening picture, promote user's visual experience.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a position distribution of a polarizer assembly and a beam splitter according to some embodiments of the present invention;

fig. 2 is a schematic diagram of ambient light directed to a polarizer assembly and a beam splitter according to some embodiments of the present invention;

fig. 3 is a schematic diagram of an optical assembly according to some embodiments of the present invention.

Reference numerals:

100. an optical component;

1. a beam splitter; 11. a light incident surface; 12. a light-emitting surface;

2. a polarizer assembly;

21. a polarizer body; 211. a polarizing layer; 212. a first protective layer; 213. a second protective layer;

22. a polarizing commutator;

3. a concave mirror;

4. an image light source;

5. a pressure sensitive adhesive;

10. a first linearly polarized light; 20. a second linearly polarized light; 30. ambient light;

200. the eyes of the user.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

With reference to fig. 1-3, an optical assembly 100 according to an embodiment of the present invention is described, where the optical assembly 100 may be used in a head-mounted display device, for example, the optical assembly 100 may be used in an AR display device. The AR display equipment needs to receive light of the environment where the user is located, and real experience of the user can be improved by projecting the light of the external environment into the display equipment. The optical assembly 100 of the present invention is mainly used in a display device of the Birdbath (coaxial curved surface) display principle. The Birdbath display device is one of AR display devices, and the main principle is that light rays of an image light source 4 are projected to the surface of a spectroscope 1 at an angle of 45 degrees. The beam splitter 1 has both reflective and transmissive effects, allowing light to be partially reflected as a percentage of the reflected value, while the remainder is transmitted as a transmitted value. The light reflected from the beamsplitter 1 bounces onto a combiner, which is a concave mirror 3, which redirects the light towards the user's eye 200. The Birdbath display device has the function of allowing a user to see both physical objects of the real world and digital images generated by the display device. In addition, the optical assembly 100 of the present invention may also be used in MR (Mixed Reality) display or XR (extended Reality) display.

As shown in fig. 3, an optical assembly 100 according to an embodiment of the present invention includes: a spectroscope 1 and a polarizer component 2.

Specifically, as shown in fig. 2 and 3, the spectroscope 1 has an incident surface 11 and an exit surface 12. It will be appreciated that the light-exiting surface 12 of the beamsplitter 1 is adjacent to the eye 200 of a user wearing the head-mounted display device. The polarizer assembly 2 is disposed on the light emitting surface 12 of the beam splitter 1. Therefore, the external light 30 outside the beam splitter 1 travels through the polarizer assembly 2 and then to the beam splitter 1. It is also understood that the ambient light 30 is natural light.

As shown in fig. 1 and 2, the polarizer assembly 2 includes a polarizer body 21 and a polarization reversing element 22, the polarization reversing element 22 is located between the beam splitter 1 and the polarizer body 21, and the polarizer body 21 is used for converting external light 30 into first linearly polarized light 10. Generally, when a user wears a head-mounted display device, the light of the environment at the user's body is natural light, which includes light vibrating vertically in all directions along its propagation path, that is, the external light 30 has 360 ° directions along a vertical plane on its propagation path (as shown in fig. 2). When natural light passes through the polarizer body 21, due to dichroism of the polarizer body (a property that some substances can absorb light vibration in a certain direction and only allow light vibration perpendicular to the direction to pass, this property is called dichroic shape), polarization of the light, that is, asymmetry of the vibration direction with respect to the propagation direction, is generated, and the first linearly polarized light 10 is generated (as shown in fig. 2).

The first linearly polarized light 10 is emitted to the beam splitter 1 after passing through the polarization reversing element 22, the beam splitter 1 reflects part of the received light to the polarization reversing element 22, the reflected light is converted into a second linearly polarized light 20 (as shown in fig. 2) by the polarization reversing element 22, and the polarization direction of the second linearly polarized light 20 is different from that of the first linearly polarized light 10. Thereby effectively reducing the external light 30 reflected from the polarizer body 21. Note that, the double-headed arrow in the circle in fig. 2 indicates the vibration direction of the light.

For example, the polarization reversing member 22 is an eighth wave plate, and through the action of the eighth wave plate, a 45 ° included angle is generated in the polarization direction between the first linearly polarized light 10 and the second linearly polarized light 20, and at this time, the portion of the second linearly polarized light 20 that transmits out of the polarizer body 21 is reduced, so that the intensity of the external light 30 reflected by the polarizer body can be reduced, and the reflection effect is weakened. And then reduce through spectroscope 1 reflection to the external light 30 in wearing user's eyes 200, reduce the influence of external light 30 in the environment that the user is located to the virtual image quality who shows in wearing display device, weaken the picture overlapping effect, improve the definition that the user watched the virtual image that shows in wearing display device, promote user's visual experience.

Therefore, in the embodiment of the present invention, as shown in fig. 2, the polarizer assembly 2 is disposed on the light emitting surface 12 of the spectroscope 1, the external light 30 is firstly emitted to the polarizer body 21 and then converted into the first linearly polarized light 10 in the linear polarization state by the natural light, the polarizer body 21 can make all the lights in the same vibration direction as the first linearly polarized light 10 pass through, and the lights in the other vibration directions pass through a small amount or cannot pass through. After the first linearly polarized light 10 passes through the polarization reversing member 22, the polarization state is changed, the linearly polarized light is converted into circularly polarized light or elliptically polarized light, when the circularly polarized light or the elliptically polarized light passes through the spectroscope 1, part of light is transmitted and utilized by the optical assembly 100, and the other part of light is reflected to the polarization reversing member 22. The polarized light reversing piece 22 converts the reflected circularly polarized light or elliptically polarized light into linearly polarized light again, namely, the second linearly polarized light 20, the polarization directions of the first linearly polarized light 10 and the second linearly polarized light 20 are different, so that the second linearly polarized light 20 cannot be effectively transmitted out from the polarizer body 21, namely, the external light 30 reflected to the eyes 200 of a user wearing the head-mounted display device through the spectroscope 1 is reduced, the influence of the external light 30 on the virtual imaging quality displayed in the head-mounted display device can be reduced, the image overlapping effect is weakened, and the visual experience of the user is improved.

According to the utility model discloses optical assembly 100, through setting up polaroid subassembly 2, make polaroid subassembly 2 establish the play plain noodles 12 at spectroscope 1, polaroid subassembly 2 includes polaroid body 21 and polarisation switching-over piece 22, polarisation switching-over piece 22 is located between spectroscope 1 and polaroid body 21, polaroid body 21 is used for converting external light 30 into first linearly polarized light 10, first linearly polarized light 10 is directive spectroscope 1 behind polarisation switching-over piece 22, spectroscope 1 reflects received partial light to polarisation switching-over piece 22, the light of reflection converts second linearly polarized light 20 into at polarisation switching-over piece 22, second linearly polarized light 20's polarization direction is different with first linearly polarized light 10's polarization direction. From this, can reduce through spectroscope 1 reflection to wearing the external light 30 in the user's of wearing display device's the eyes 200 to can reduce the influence of external light 30 to the virtual image quality who shows in wearing display device, the reduction picture overlaps the effect, promotes user's visual experience.

As shown in fig. 2, according to some embodiments of the present invention, the polarization direction of the first linearly polarized light 10 is perpendicular to the polarization direction of the second linearly polarized light 20. Therefore, the transmission directions of the second linearly polarized light 20 and the polarizer body 21 are perpendicular, so that the second linearly polarized light 20 cannot be transmitted from the polarizer body 21, and it can be understood that the polarizer body 21 completely absorbs the second linearly polarized light 20. Therefore, the external light 30 can be effectively prevented from being reflected to the eyes 200 of the user wearing the head-mounted display device through the spectroscope 1, the image overlapping is avoided, the virtual imaging quality displayed in the head-mounted display device is improved, and the visual experience of the user is improved.

According to some embodiments of the present invention, the polarization converter 22 is a retardation compensation film. Therefore, the polarization reversing member 22 can be ensured to change the polarization state of the first linearly polarized light 10, and the reliability of the optical assembly 100 is further improved.

Specifically, the polarization commutator 22 is a quarter-phase difference compensation film. Therefore, when the first linearly polarized light 10 passes through the quarter-phase difference compensation film, the vibration direction of the polarized light is changed to form circularly polarized light, when the circularly polarized light passes through the beam splitter 1, part of the light is transmitted and utilized by the optical assembly 100, the other part of the light is reflected back, the reflected light passes through the quarter-phase difference compensation film again, the vibration direction is changed to form the second linearly polarized light 20, the polarization directions of the second linearly polarized light 20 and the first linearly polarized light 10 are different and form a 90-degree orthogonal relation, and therefore, the transmission directions of the second linearly polarized light 20 and the polarizer body 21 are perpendicular, and therefore the second linearly polarized light 20 cannot be transmitted from the polarizer body 21. Therefore, the external light 30 can be effectively prevented from being reflected to the eyes 200 of the user wearing the head-mounted display device through the spectroscope 1, the image overlapping is avoided, the virtual imaging quality displayed in the head-mounted display device is improved, and the visual experience of the user is improved.

As shown in fig. 3, according to some embodiments of the present invention, the optical assembly 100 further includes a concave mirror 3, the concave mirror 3 is located on one side of the spectroscope 1 away from the polarizer assembly 2 and is recessed towards one side away from the spectroscope 1, and an included angle is formed between the optical axis of the concave mirror 3 and the light incident surface 11 of the spectroscope 1. Therefore, it can be understood that the light can be refracted back and forth in the beam splitter 1 and the concave mirror 3, and the optical axis of the concave mirror 3 and the light incident surface 11 of the beam splitter 1 form an included angle, so that the volume of the optical assembly 100 can be effectively reduced under the condition of a certain optical path.

Optionally, the included angle is 30 ° to 55 °. Optionally, the included angle is 32.3 ° to 53.5 °. Optionally, the included angle is 35.6 ° to 50.8 °. Optionally, the included angle is 38.7 ° to 48.9 °. Optionally, the included angle is 45 °. So can guarantee that the light in the optical assembly 100 propagates in shorter route, and then dwindles the holistic volume of optical assembly 100, the installation of being convenient for also makes the head-mounted display device miniaturized, portable simultaneously.

In some embodiments of the present invention, the concave mirror 3 and the spectroscope 1 are both provided with a semi-transparent and semi-reflective film on their surfaces close to each other. Known, concave mirror 3 is sunken towards the one side of keeping away from spectroscope 1, and concave mirror 3 is close to spectroscope 1's a side surface and is equipped with half-transparent half-reflecting film, and from this under concave mirror 3's sunken effect, the light that reflects through half-transparent half-reflecting film can be to inside convergence, and then focuses near wearing user's people eye, guarantees to wear that the user can see more clear picture. The semi-transparent semi-reflecting film on the spectroscope 1 is used for enabling part of light to transmit through the spectroscope 1 and enabling the other part of light to be reflected to the concave mirror 3, so that the light is refracted back in the optical component 100, and under the condition that the optical distance is fixed, the volume of the optical component 100 is effectively reduced.

It should be noted that the transflective film can be plated or attached on the surface of the concave mirror 3 or the spectroscope 1. Specifically, the transflective film may be disposed on the concave mirror 3 or the spectroscope 1 in an attaching manner, or may be disposed on the concave mirror 3 or the spectroscope 1 in a coating manner. In addition, the transflective film can also be an independent optical element, that is, the transflective film has a certain interval with the concave mirror 3 or the spectroscope 1 or is separately arranged. The adhesive is easy to process by adopting an adhering mode, and is directly adhered by adopting glue. The film coating mode can ensure that the arranged film layer has better adhesive force on the surface of the concave mirror 3 or the spectroscope 1, and further the film layer is firmer. The transflective film reflects a part of received light and transmits the other part of the received light. The reflection and transmission are set in a ratio, typically one to one. Of course, other ratios may be provided as desired, such as three to seven reflection and transmission ratios, seven to three, etc.

In some embodiments of the present invention, the optical assembly 100 further includes an image light source 4, the image light source 4 is located between the spectroscope 1 and the concave mirror 3, and the image light source 4 can emit an imaging light beam toward the light incident surface 11 of the spectroscope 1. It can be seen that the virtual imaging light source displayed by the head-mounted display device comes from the image light source 4. The Light Emitting principle of the image Light source 4 may be various, such as Micro-OLED (organic Light-Emitting Diode) display, LCOS (Liquid Crystal on Silicon) display, DLP (Digital Light Processing) display, and the like.

Specifically, as shown in fig. 3, the image light source 4 emits an imaging light beam toward the light incident surface 11 of the beam splitter 1, and the imaging light beam is reflected and transmitted at the light incident surface 11 to generate a first reflected light ray and a first transmitted light ray. The first transmission light ray is transmitted in the spectroscope 1, the polarization reversing member 22 and the polarizer body 21 in sequence and then emitted to eyes of a user wearing the polarizer, the first reflection light ray is emitted to the concave mirror 3, and reflection and transmission occur again on the surface of the concave mirror 3 to generate a second reflection light ray and a second transmission light ray. The second reflected light is reflected back to the beam splitter 1, passes through the beam splitter 1 and the polarizer assembly 2 and is directed towards the eye 200 of the wearer. The second transmitted light is transmitted through the concave mirror 3.

As shown in fig. 1, according to some embodiments of the present invention, opposite sides of the polarizing commutator 22 are respectively bonded to the polarizer body 21 and the spectroscope 1 by the pressure-sensitive adhesive 5. It is known that the pressure-sensitive adhesive 5 has good adhesiveness and light transmittance, so that the polarizing and inverting member 22 can be firmly adhered to the polarizer body 21 and the dichroic mirror 1 without affecting the light transmittance. It should be noted that the polarizing reversing element 22 may be adhered to the polarizer body 21 and the dichroic mirror 1 by other adhesive members, as long as the reliability of the polarizer assembly 2 is ensured.

Specifically, as shown in fig. 1, the polarizer body 21 includes a polarizing layer 211, a first protective layer 212, and a second protective layer 213, the first protective layer 212 is disposed on a surface of the polarizing layer 211 away from the polarization reversing element 22, and the second protective layer 213 is disposed on a surface of the polarizing layer 211 close to the polarization reversing element 22. The polarizing layer 211 is an organic material such as polyvinyl alcohol (PVA). The first protection layer 212 and the second protection layer 213 are made of a transparent material, such as triacetyl cellulose (TAC), to ensure smooth light passing therethrough. The polarizing layer 211 mainly functions to convert natural light into linearly polarized light. In addition, the polarizer body 21 is usually disposed at the outermost portion of the optical assembly 100, that is, the polarizer body 21 faces a complicated external environment. In order to ensure that the polarizing layer 211 is not damaged, the first protective layer 212 may be disposed on the surface of the polarizing layer 211 away from the spectroscope 1, and the first protective layer 212 has certain hardness and wear resistance, so that it is possible to prevent external hard objects from colliding with the optical assembly 100, resulting in damage to the polarizing layer 211. Moreover, the polarizing layer 211 is soft or brittle, and the second protection layer 213 is disposed on the surface close to the beam splitter 1, so that the second protection layer 213 can effectively support the structure of the polarizing layer 211, and the inside of the polarizing layer 211 is also protected by the second protection layer 213.

According to the utility model discloses head-mounted display device, include according to the utility model discloses optical assembly 100 of above-mentioned embodiment.

According to the embodiment of the present invention, the head-mounted display device is provided with the optical assembly 100 according to the present invention. From this, can reduce through spectroscope 1 reflection to wearing the external light 30 in the user's of wearing display device's the eyes 200 to can reduce the influence of external light 30 to the virtual image quality who shows in wearing display device, the reduction picture overlaps the effect, promotes user's visual experience.

Other configurations and operations of the head mounted display device according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims (10)

1. An optical assembly, comprising:

the spectroscope is provided with a light incident surface and a light emergent surface;

the polarizer assembly is arranged on a light outgoing surface of the spectroscope and comprises a polarizer body and a polarization reversing piece, the polarization reversing piece is located between the spectroscope and the polarizer body, the polarizer body is used for converting external light into first linearly polarized light, the first linearly polarized light is emitted to the spectroscope after passing through the polarization reversing piece, the spectroscope reflects part of received light to the polarization reversing piece, the reflected light is converted into second linearly polarized light by the polarization reversing piece, and the polarization direction of the second linearly polarized light is different from that of the first linearly polarized light.

2. An optical assembly according to claim 1, wherein the polarization direction of the first linearly polarized light is perpendicular to the polarization direction of the second linearly polarized light.

3. The optical assembly of claim 1, wherein the polarizing commutator is a retardation compensation film.

4. The optical assembly of claim 1, further comprising a concave mirror, wherein the concave mirror is located on a side of the beam splitter, away from the polarizer assembly, and is recessed toward a side away from the beam splitter, and an optical axis of the concave mirror and the light incident surface of the beam splitter form an included angle.

5. An optical assembly according to claim 4, wherein the included angle is 30 ° -55 °.

6. An optical assembly according to claim 5, wherein the included angle is 45 °.

7. An optical assembly according to claim 4, wherein the concave mirror and the beam splitter are provided with transflective films on their surfaces adjacent to each other.

8. The optical assembly of claim 4, further comprising an image light source positioned between the beam splitter and the concave mirror, the image light source being operable to emit an imaging beam toward the entrance face of the beam splitter.

9. The optical assembly of claim 1, wherein opposite sides of the polarizing commutator are respectively bonded to the polarizer body and the beam splitter via pressure sensitive adhesives.

10. A head-mounted display device comprising an optical assembly according to any one of claims 1-9.

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