CN111474715A - Optical system and augmented reality device - Google Patents
Optical system and augmented reality device Download PDFInfo
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- CN111474715A CN111474715A CN202010329616.9A CN202010329616A CN111474715A CN 111474715 A CN111474715 A CN 111474715A CN 202010329616 A CN202010329616 A CN 202010329616A CN 111474715 A CN111474715 A CN 111474715A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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Abstract
The invention discloses an optical system and augmented reality equipment, wherein the optical system comprises a display screen, a first lens group and a second lens, and the first lens group comprises a first lens; the first lens is obliquely arranged relative to the display screen and comprises a first surface and a second surface; the second lens comprises a third surface and a fourth surface; the first surface is provided with a first polarization reflection film, the third surface is provided with a second polarization reflection film, and one side of the second polarization reflection film, which is close to the first lens, is also provided with a first phase retarder. The application provides an optical system and augmented reality equipment, aims at solving the problem that the light transmission efficiency of augmented reality equipment is low among the prior art.
Description
Technical Field
The invention relates to the technical field of imaging, in particular to an optical system and augmented reality equipment.
Background
Present augmented reality equipment, because the light of display screen and the light of external environment in the needs simultaneous receiving equipment, in order to avoid the display screen to cause when observing external environment to the user and shelter from, the light that can use the beam splitter to send the display screen reflects usually, and transmit to the light that external environment got into, and this kind of condition leads to the light that the display screen sent and the light of external environment at the in-process of transmission to people's eye, there are more partial light to be blockked by optical system, thereby reduce light transmission efficiency, make the image brightness reduction that people's eye observed.
Disclosure of Invention
The application provides an optical system and augmented reality equipment, aims at solving the problem that the light transmission efficiency of augmented reality equipment is low among the prior art.
In order to achieve the above object, the present invention provides an optical system, which includes a display screen, a first lens group and a second lens, wherein the first lens group includes a first lens;
the first lens comprises a first surface close to the display screen and a second surface far away from the display screen, and the first surface is obliquely arranged relative to the display screen;
the second lens comprises a third surface close to the first surface and a fourth surface far away from the first surface;
the display screen is characterized in that a first polarization reflection film is arranged on the first surface, a second polarization reflection film is arranged on the third surface, a first phase retarder is further arranged on one side, close to the first lens, of the second polarization reflection film, and the second polarization reflection film is used for reflecting the elliptically polarized light or the circularly polarized light which is emitted by the display screen and passes through the first phase retarder.
Optionally, the reflection direction of the first polarization reflection film is perpendicular to the reflection direction of the second polarization reflection film.
Optionally, the first surface is a planar structure, and the first surface and the display screen form an included angle of 45 degrees.
Optionally, the optical system further includes a second phase retarder disposed between the display screen and the first lens.
Optionally, the second surface is a convex spherical surface structure, a concave spherical surface structure, a fresnel surface structure, a free-form surface structure, or a liquid crystal lens structure.
Optionally, the third surface is a spherical surface or an aspherical surface or a free-form surface, and the fourth surface is a spherical surface or an aspherical surface or a free-form surface.
Optionally, the fourth surface is plated with an antireflection film.
Optionally, the display screen is a liquid crystal silicon-attached display unit, a liquid crystal display unit, an organic light emitting diode display unit, or a micro organic light emitting diode display unit.
Optionally, the first lens group further includes a third lens, the third lens is disposed on a side of the first lens away from the second lens, and a working surface of at least one side of the third lens is a curved surface structure.
In order to achieve the above object, the present application provides an augmented reality device, which is characterized in that the augmented reality device includes a housing and an optical system as described in any one of the above embodiments, and the optical system is accommodated in the housing.
In the technical scheme provided by the application, the light emitted by the display screen is transmitted to the first surface, the light emitted by the display screen is first linearly polarized light, since the polarization direction of the first linearly polarized light is perpendicular to the reflection direction of the first polarizing reflective film, the first linearly polarized light is reflected at the first surface and reflected to the third surface of the second lens, because the first phase retarder is arranged between the first lens and the second lens, the first linearly polarized light is converted into first elliptically polarized light from the first linearly polarized light after passing through the first phase retarder, the first elliptically polarized light is reflected on the second polarization reflection film, the first elliptically polarized light is converted into second elliptically polarized light, and the rotation property of the second elliptically polarized light is opposite to that of the first elliptically polarized light. The second elliptically polarized light passes through the second phase retarder again after being reflected by the second polarization reflection film, and is converted into second linearly polarized light under the action of the second phase retarder, the polarization direction of the second linearly polarized light is vertical to the polarization direction of the first linearly polarized light, when the second linearly polarized light is transmitted to the first polarization reflection film on the first surface, the polarization direction of the second linearly polarized light is the same as the transmission direction of the first polarization reflection film, therefore, the second linearly polarized light is transmitted to human eyes after penetrating through the first surface and the second surface, the polarization direction of the light is changed by arranging the polarization reflection film and the phase retarder between the first surface and the third surface, and the loss of the light passing through the optical system is reduced, improve the light transmission efficiency among the augmented reality equipment, solved the problem that the light transmission efficiency of augmented reality equipment is low among the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of the construction of an optical system of the present invention;
FIG. 2 is a schematic illustration of the optical path of an embodiment of the optical system of the present invention;
FIG. 3 is a schematic optical path diagram of another embodiment of the optical system of the present invention;
fig. 4 is a schematic optical path diagram of another embodiment of the optical system of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
310 | |
| 200 | |
320 | The |
| 210 | First lens | 400 | A first polarizing |
| 211 | |
500 | |
| 212 | Second surface | 600 | Second polarizing |
| 220 | |
700 | Second |
| 300 | Second lens |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides an optical system and an augmented reality device.
Referring to fig. 1 and 2, the optical system includes a display screen 100, a first lens group 200 and a second lens group 300, wherein the first lens group 200 includes a first lens 210;
the first lens 210 comprises a first surface 211 close to the display screen 100 and a second surface 212 far away from the display screen 100, and the first surface 211 is obliquely arranged relative to the display screen 100;
the second lens 300 includes a third surface 310 close to the first lens 210 and a fourth surface 320 far from the first lens 210; in a preferred embodiment, the third surface 310 has a curved surface structure.
The first surface 211 is provided with a first polarization reflective film 400, the third surface 310 is provided with a second polarization reflective film 600, one side of the second polarization reflective film 600 close to the first lens 210 is further provided with a first phase retarder 500, and the second polarization reflective film 600 is used for reflecting the elliptically polarized light or circularly polarized light which is emitted by the display screen 100 and passes through the first phase retarder 500. Specifically, the light vector rotates at a certain frequency in a plane perpendicular to the propagation direction of light, and if the end point locus of the light vector is an ellipse, the light is elliptically polarized light, and if the end point locus of the light vector is a circle, the light is circularly polarized light.
In the technical solution provided in the present application, the optical system includes a display screen 100, a first lens group 200 and a second lens group 300, where the first lens group 200 includes a first lens 210; the first lens 210 is obliquely arranged relative to the display screen 100, a first polarization reflective film 400 is arranged on the first surface 211 of the first lens 210, a second polarization reflective film 600 is arranged on the third surface 310, and a first phase retarder 500 is further arranged on one side, close to the first lens 210, of the second polarization reflective film 600; the reflection direction of the first polarizing reflective film 400 is perpendicular to the reflection direction of the second polarizing reflective film 600.
The light emitted by the display screen 100 is transmitted to the first surface 211, the light emitted by the display screen 100 is a first linearly polarized light, since the polarization direction of the first linearly polarized light is perpendicular to the reflection direction of the first polarizing reflective film 400, the first linearly polarized light is reflected at the first surface 211, and is reflected to the third surface 310 of the second lens 300, since the first phase retarder 500 is disposed between the first lens 210 and the second lens 300, the first linearly polarized light is transformed from the first linearly polarized light into a first elliptically polarized light after passing through the first phase retarder 500, the first elliptically polarized light is reflected by the second polarization reflection film 600, and the first elliptically polarized light is converted into second elliptically polarized light, wherein the helicity of the second elliptically polarized light is opposite to that of the first elliptically polarized light. The second elliptically polarized light passes through the second phase retarder 700 again after being reflected by the second polarization reflection film 600, and is converted into a second linearly polarized light by the second phase retarder 700.
The second linearly polarized light is transmitted to the first surface 211 when the first polarization reflection film 400, because the polarization direction of the second linearly polarized light is the same as the transmission direction of the first polarization reflection film 400, the second linearly polarized light is transmitted to human eyes after penetrating through the first surface 211 and the second surface 212, and the polarization direction of the light is changed by arranging the polarization reflection film and the phase retarder between the first surface 211 and the third surface 310, so that more light emitted from the display screen 100 enters the human eyes, the light energy loss of the light emitted from the display screen 100 in the process of entering the human eyes is reduced, the transmission efficiency of the light is improved, and the problem of low light transmission efficiency of the augmented reality device in the prior art is solved.
In another specific embodiment, when an included angle between the fast axis direction of the first phase retarder 500 and the reflection direction of the second polarization reflection film 600 is 45 degrees, the first linearly polarized light is converted into a first circularly polarized light after passing through the first phase retarder 500, the first circularly polarized light is reflected by the second polarization reflection film 600, the first circularly polarized light is converted into a second circularly polarized light, and the rotation of the second circularly polarized light is opposite to the rotation of the first circularly polarized light. The second circularly polarized light passes through the second phase retarder 700 again after being reflected by the second polarization reflection film 600, and is converted into a second linearly polarized light by the second phase retarder 700.
Specifically, when the included angle between the long axis of the first elliptically polarized light and the reflection direction of the second polarization reflection film 600 is smaller, the reflectivity of the first elliptically polarized light passing through the second polarization reflection film 600 is higher, so that the transmission efficiency of light in the optical system can be improved.
In a preferred embodiment, the reflection direction of the first polarization reflection film 400 is perpendicular to the reflection direction of the second polarization reflection film 600, so that when the second linearly polarized light reflected by the second polarization reflection film 600 passes through the first polarization reflection film 400, the polarization direction of the second linearly polarized light is the same as the transmission direction of the first polarization reflection film 400, thereby improving the transmission efficiency of the light.
Referring to fig. 1 to fig. 3, in an alternative embodiment, the first surface 211 is a planar structure, and an included angle between the first surface 211 and the display screen 100 is 45 degrees. Specifically, because the light emitted by the display screen 100 is reflected by the first surface 211 and then transmitted to the third surface 310, and is reflected by the third surface 310 again and then returned to the first surface 211, in order to ensure that the light reflected by the third surface 310 can be returned to the first surface 211 and transmitted to the human eye through the second surface 212, an included angle of 90 degrees can be formed between the light reflected by the first surface 211 and the third surface 310, so that the light reflected by the third surface 310 can be returned along the original light path, and the light is returned to the first surface 211. In a preferred embodiment, the first surface 211 is at an angle of 45 degrees with respect to the display screen 100, so as to ensure that the incident light and the emergent light of the first surface 211 are perpendicular to each other. In one embodiment, the first lens 210 is disposed obliquely to the display screen 100, and in another embodiment, the first lens 210 is disposed on the light-emitting side of the display screen 100, and only the first surface 211 is disposed obliquely to the display screen 100.
In an alternative embodiment, in order to ensure that the light emitted from the display panel 100 can be reflected by the first polarization reflection film 400, and ensure that the light emitted from the display panel 100 and transmitted to the first polarization reflection film 400 is linearly polarized light, and the polarization direction of the linearly polarized light is the same as the reflection direction of the first polarization reflection film 400, specifically, when the light emitted from the display panel 100 is circularly polarized light, in order to adjust the polarization direction of the light emitted from the display panel 100, the second phase retarder may be disposed between the display panel 100 and the first polarization reflection film, and when the light emitted from the display panel 100 is circularly polarized light, the circularly polarized light passes through the second phase retarder and is converted into linearly polarized light, and by setting the polarization direction of the second phase retarder to be 45 degrees with the reflection direction of the first polarization reflection film 400, it is possible to ensure that the polarization direction of the linearly polarized light formed after the circularly polarized light passes through the second phase retarder is the same as the reflection direction of the first polarization reflection film 400.
In an alternative embodiment, the second surface 212 is a convex spherical structure, a concave spherical structure, a fresnel surface structure, a free-form surface structure, or a liquid crystal lens structure. In particular, when a user has a problem of myopia or hyperopia, the user may influence the image observed by the user due to the structural problem of the human eye when observing, and in order to compensate the myopia or hyperopia or other eye problems of the user, the user is usually required to wear glasses to compensate the structural problem of the human eye, when the user wearing the glasses uses the augmented reality device, the eyes can block the user from wearing the augmented reality device, when the user uses the augmented reality device without wearing eyes, the problem that the user cannot see the image clearly occurs, to compensate for this, machining may be performed through the second surface 212, the second surface 212 of the first lens 210 is processed according to the eye structure of the user, therefore, the light emitted by the display screen 100 can be focused on the eyes of the user, and the user can conveniently and clearly view the light emitted by the display screen 100. It is understood that the second surface 212 is not limited to a concave spherical structure or a convex spherical structure, but may also be a fresnel surface structure or a free-form surface structure or a liquid crystal lens structure.
In an alternative embodiment, the third surface 310 is a spherical surface or an aspherical surface or a free-form surface, and the fourth surface 320 is a spherical surface or an aspherical surface or a free-form surface. Specifically, the light emitted from the display screen 100 is reflected by the first surface 211 and then transmitted to the third surface 310, and is reflected by the third surface 310 and then transmitted to the human eye through the first lens 210, and the light of the external environment enters the optical system from the fourth surface 320 and is transmitted to the human eye after passing through the third surface 310, the first surface 211 and the second surface 212 in sequence. In order to facilitate focusing and imaging of the light reflected by the first surface 211, the third surface 310 and the fourth surface 320 are configured as curved structures, and the curved structures may be spherical surfaces or aspheric surfaces, and it is understood that the curved structures may also be free-form surfaces or other surface-type structures capable of facilitating imaging.
In an alternative embodiment, the first phase retarder 500 is a quarter-wave plate, and specifically, the wave plate is an optical device capable of generating an additional optical path difference between two optical vibrations perpendicular to each other, wherein the commonly used wave plates include a quarter-wave plate and a half-wave plate.
When linearly polarized light passes through the quarter-wave plate, if the polarization direction of the linearly polarized light is 0 degree or 90 degrees with the fast axis of the quarter-wave plate, the linearly polarized light is still linearly polarized after passing through the quarter-wave plate, if the polarization direction of the linearly polarized light is 45 degrees with the fast axis of the quarter-wave plate, the linearly polarized light is converted into circularly polarized light, and if the polarization direction of the linearly polarized light is at other angles with the fast axis of the quarter-wave plate, the linearly polarized light is converted into elliptically polarized light;
when linearly polarized light passes through the half wave plate, if the polarization direction of the linearly polarized light is theta degrees with the fast axis of the half wave plate, the linearly polarized light is still linearly polarized after passing through the half wave plate, and an included angle between the polarization direction of the linearly polarized light after passing through the half wave plate and the polarization direction of the linearly polarized light after passing through the half wave plate is 2 theta degrees.
In an alternative embodiment, the fourth surface 320 is plated with an antireflection film, and when the enhanced display device is used, a user can observe the external environment in addition to the display content of the display screen 100, specifically, in order to improve the transmission efficiency of light rays from the external environment entering the human eye through the optical system, the antireflection film is disposed on the fourth surface 320, so as to reduce the reflection of the light rays on the fourth surface 320. The transmittance of light at the fourth surface 320 is improved.
In an alternative embodiment, the display screen 100 is a liquid crystal silicon-attached display unit or a liquid crystal display unit or a light emitting diode display unit or a micro organic light emitting diode display unit, and it is understood that the display screen 100 is not limited thereto, and in other embodiments, the display screen 100 may also be other types of small display devices.
Referring to fig. 4, in an alternative embodiment, the first lens group 200 further includes a third lens element 220, the third lens element 220 is separated from the first lens element 210 by a distance from the second lens element 300, and at least one working surface of the third lens element 220 has a curved surface structure, specifically, when the user's degree of myopia or hyperopia is high, adjusting the optical power by the first transparency alone results in a thicker central thickness of the first lens 210, and the size of the first lens 210 is large, it is inconvenient to process and replace the first lens 210, the third lens 220 may be disposed on a side of the first lens 210 away from the second lens 300, and when a user views light emitted from the display screen 100, the power may be adjusted to match the user's near or far vision needs by the combined action of the first lens 210 and the third lens 220. In a preferred embodiment, at least one working surface of the third lens element 220 is a curved surface structure, and specifically, the working surface of the third lens element 220 is a light incident surface or a light emitting surface.
The present invention further provides an augmented reality device, where the augmented reality device includes the optical system according to any of the above embodiments, and the specific structure of the optical system refers to the above embodiments, and since the optical system adopts all technical solutions of all the above embodiments, the optical system at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated here.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An optical system is characterized by comprising a display screen, a first lens group and a second lens, wherein the first lens group comprises a first lens;
the first lens comprises a first surface close to the display screen and a second surface far away from the display screen, and the first surface is obliquely arranged relative to the display screen;
the second lens comprises a third surface close to the first surface and a fourth surface far away from the first surface;
the display screen is characterized in that a first polarization reflection film is arranged on the first surface, a second polarization reflection film is arranged on the third surface, a first phase retarder is further arranged on one side, close to the first lens, of the second polarization reflection film, and the second polarization reflection film is used for reflecting the elliptically polarized light or the circularly polarized light which is emitted by the display screen and passes through the first phase retarder.
2. The optical system of claim 1, wherein the direction of reflection of the first polarizing reflective film is perpendicular to the direction of reflection of the second polarizing reflective film.
3. The optical system of claim 1 wherein the first surface is planar and the first surface is at a 45 degree angle to the display screen.
4. The optical system of claim 1, further comprising a second phase retarder disposed between the display screen and the first lens.
5. The optical system of claim 1, wherein the second surface is a convex spherical structure, a concave spherical structure, a fresnel surface structure, a free-form surface structure, or a liquid crystal lens structure.
6. The optical system of claim 1, wherein the third surface is spherical or aspherical or free-form, and the fourth surface is spherical or aspherical or free-form.
7. The optical system of claim 1, wherein the fourth surface is coated with an antireflection film.
8. The optical system of claim 1, wherein the display screen is a liquid crystal silicon-on-silicon display unit or a liquid crystal display unit or an organic light emitting diode display unit or a micro organic light emitting diode display unit.
9. The optical system as claimed in claim 1, wherein said first lens group further comprises a third lens element, said third lens element is disposed on a side of said first lens element away from said second lens element, and at least one working surface of said third lens element is a curved surface structure.
10. An augmented reality device comprising a housing and an optical system as claimed in any one of claims 1 to 9, the optical system being housed within the housing.
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| CN202010329616.9A CN111474715A (en) | 2020-04-23 | 2020-04-23 | Optical system and augmented reality device |
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| CN111999898A (en) * | 2020-09-18 | 2020-11-27 | 京东方科技集团股份有限公司 | Optical display system and display device |
| CN114236844A (en) * | 2021-12-26 | 2022-03-25 | 江苏鸿蚁光电科技有限公司 | Optical display system capable of meeting binocular viewing |
| CN115047630A (en) * | 2022-06-30 | 2022-09-13 | 上海摩勤智能技术有限公司 | AR optical system and AR device |
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Application publication date: 20200731 |