CN206224048U - A kind of VR display devices and wear-type VR display devices - Google Patents
A kind of VR display devices and wear-type VR display devices Download PDFInfo
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Abstract
The utility model discloses a kind of VR display devices and wear-type VR display devices, the characteristics of with small size, big visual angle and correcting chromatic aberration, VR display devices include：Double sphere-prisms and display screen；Double sphere-prisms include the first lens unit, the second lens unit and reflector element；First lens unit is coaxially disposed near display screen, the first lens unit with display screen, and the optical axis of the first lens unit intersects with the optical axis of the second lens unit；First lens unit and the second lens unit are spherical lens；Reflector element is located between the first lens unit and the second lens unit, reflecting material is coated with reflector element to form a reflecting surface, so that the virtual reality image light from display screen is from after the transmission of the first lens unit, reflect on the reflecting surface, the image light for reflecting forms the virtual image amplified from after the transmission of the second lens unit.
Description
Technical Field
The embodiment of the utility model provides a relate to and show technical field, especially relate to a VR display device and head-mounted VR display equipment.
Background
Vr (virtual reality), i.e. a virtual reality display technology, integrates a plurality of scientific technologies such as computer graphics technology, computer simulation technology, sensor technology, display technology, etc., and creates a virtual information environment in a multidimensional information space, so that a user can have an immersive sensation of being personally on the scene, have a perfect interaction capability with the environment, and contribute to inspiring ideas. The head-mounted virtual reality display equipment utilizes the helmet display to seal the visual sense and the auditory sense of the human and the outside world and guide a user to generate a feeling of being personally on the scene.
The principle of the virtual reality display device is as follows: the near image generated by the display is pulled to be far and enlarged through the optical lens system, and the visual field range of a person is nearly filled, so that the immersion feeling is generated. Since the field of view of human eyes is very wide, in order to ensure a sufficient field of view, y ═ f × tan (w/2) (where y is the object height (screen size), w is the field of view, and f is the focal length), under the condition that the object height y is not changed, the combined focal length of the whole set of optical lens system must be small enough to ensure that the field of view is large enough, and the size of the lens does not become a main factor restricting the field of view size, and the size of the lens must be large enough.
In order to ensure the comfort of using the VR head mounted display device, the weight of the device must be light enough, and the quality of the displayed image must be high enough to avoid excessive aberration. At present, a main solution in the market is to use a single-chip resin aspheric lens or a fresnel lens, but although the single-chip lens can reduce the weight, the size of the field lens cannot be reduced, the diameter is generally about 35-50mm, and the focal length cannot be too small and generally larger than 35mm in order to ensure the image quality, which causes the whole display device to have a large size in both the transverse direction and the longitudinal direction, thereby bringing about extremely poor user experience.
Meanwhile, because a single lens is adopted, image distortion and chromatic aberration cannot be effectively corrected, the distortion must be corrected by software, the load of a processor is increased, the picture is delayed, and even dizziness can be brought.
In order to improve user experience, the problem that miniaturization, lightweight are virtual display device and need solve urgently, this scheme proposes a novel formation of image light path, will effectually reduce the display device volume.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a VR display device and head-mounted VR display device, the effectual volume that reduces head-mounted VR display device.
The embodiment of the utility model provides a virtual reality VR display device, include: the double-spherical prism (2) and the display screen (4);
the double-spherical prism (2) comprises a first lens unit, a second lens unit and a reflection unit; the first lens unit is close to the display screen (4), the first lens unit is coaxially arranged with the display screen (4), and the optical axis of the first lens unit is intersected with the optical axis of the second lens unit;
the first lens unit and the second lens unit are both spherical lenses;
the reflection unit is located between the first lens unit and the second lens unit, and the reflection unit is plated with a reflection material to form a reflection surface, so that after the virtual reality image light from the display screen (4) is transmitted from the first lens unit, the reflection occurs on the reflection surface, and the reflected image light forms an enlarged virtual image after being transmitted from the second lens unit.
Further, the lens further comprises a first lens (1), wherein the first lens (1) is close to the second lens unit and is arranged coaxially with the second lens unit.
Further, a second lens (3);
the second lens (3) is positioned between the display screen (4) and the double-spherical prism (2), and the second lens (3) and the double-spherical prism (2) are combined into a double-cemented spherical prism;
wherein the second lens (3) is a biconcave lens, one concave surface of the second lens (3) near the biaspheric prism (2) is cemented with the spherical surface (S2) of the first lens unit, wherein the spherical surface (S2) of the first lens unit is convex.
Further, the first lens (1) is a positive lens, one surface of the first lens (1) close to the second lens unit is a convex surface, and the convex surface is an aspheric surface; one surface of the first lens (1) far away from the second lens unit is a concave surface, and the concave surface is an aspheric surface or a spherical surface.
Further, the first lens (1) has a focal length f ', wherein 17mm < f' <30 mm.
Further, the optical axis of the first lens unit is perpendicular to the optical axis of the second lens unit, and the reflecting surface of the reflecting unit forms an included angle of 45 degrees with the optical axis of the first lens unit and the optical axis of the second lens unit respectively.
Further, the double-spherical prism (2) is an integrated structure formed by combining the first lens unit, the second lens unit and the reflection unit; or,
the double-spherical-surface prism (2) is a double-spherical-surface cemented prism formed by respectively cementing the first lens unit and the second lens unit with the reflecting unit.
Further, the curvatures of the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit are the same.
Further, the distance from the spherical surface (S2) of the first lens unit to the center of the reflection surface and the distance from the spherical surface (S1) of the second lens unit to the center of the reflection surface are both larger than the side of the display screen where the width is largest.
Further, at least one of the convex surface and the concave surface of the first lens (1) is plated with an antireflection film.
Further, the surfaces of the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit are plated with the same antireflection film.
Further, the reflecting surface is a total reflecting surface, and the reflecting material is a silver-plated reflecting film or other metal medium reflecting films.
Furthermore, the double concave surfaces of the second lens (3) are plated with antireflection films.
An embodiment of the utility model provides a wear-type VR display device, VR display device in the above-mentioned embodiment.
In the above embodiment, the dual spherical prism (2) includes two spherical surfaces and a reflecting surface, the two spherical surfaces and the reflecting surface are integrated in one prism, and the optical axes of the two spherical surfaces intersect with each other in the reflecting unit, that is, the first lens unit, the second lens unit and the reflecting unit are integrated in the dual spherical prism (2), and the optical axis of the first lens unit intersects with the optical axis of the second lens unit, so that the dual spherical prism (2) has a light turning function, thereby achieving the light turning, avoiding the optical lens system from being too long in one-way length, and enabling the volume of the optical lens system to be smaller and lighter; secondly, the first lens unit, the second lens unit and the reflection unit are integrated in the double-spherical prism (2), so that the number of lenses can be reduced, the assembly space of the lenses can be saved, and the volume miniaturization of the whole optical lens system is realized.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1a to 4 are schematic structural diagrams of a VR display device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dual spherical prism (2) according to an embodiment of the present invention;
fig. 6 is a schematic view of an optical path of a VR display device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a preferred VR display device according to an embodiment of the present invention;
fig. 8 is a schematic perspective view of an optimized VR display device according to an embodiment of the present invention
Fig. 9 is a schematic optical path diagram of a preferred VR display device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and effects of the present invention more clearly understood, the following description of the preferred embodiments of the present invention with reference to the accompanying drawings is provided, and it should be understood that the preferred embodiments described herein are only used for describing and explaining the present invention, and are not used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
An embodiment of the utility model provides a VR display device, as shown in FIG. 1a, include: the double-spherical prism (2) and the display screen (4);
the double-spherical prism (2) comprises a first lens unit, a second lens unit and a reflecting unit; the first lens unit is close to the display screen (4), the first lens unit is coaxially arranged with the display screen (4), and the optical axis of the first lens unit is intersected with the optical axis of the second lens unit;
the first lens unit and the second lens unit are both spherical lenses; the reflection unit is located between the first lens unit and the second lens unit, the reflection unit is coated with a reflection material to form a reflection surface, so that after the virtual reality image light from the display screen (4) is transmitted from the first lens unit, the reflection occurs on the reflection surface, and the reflected image light forms an enlarged virtual image after being transmitted from the second lens unit.
Among the above-mentioned VR display device, display screen (4) adopt 0.7 cun or 0.5 cun screen, and the image light that display screen (4) sent is virtual reality image light, and along with the change of optical device size, the size of display screen (4) can also adopt other arbitrary suitable dimension specification.
Referring to fig. 1a, a double spherical prism (2) is an integrated structure in which a first lens unit, a second lens unit, and a reflection unit are combined. The double-spherical prism (2) comprises two spherical surfaces and a plurality of inclined surfaces, the two spherical surfaces are respectively the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit, the first lens unit, the second lens unit and the reflection unit are combined into an integrated structure, assembly errors can be avoided, and the VR display device is beneficial to being compact in size.
The first lens unit and the second lens unit are spherical lenses, the first lens unit can be a convex lens (as shown in fig. 1a) or a concave lens (as shown in fig. 1b), when the spherical surface of the first lens unit is a convex surface, the size of the display screen is limited, and the size cannot be too large, so that the resolution of the display screen is required to be improved, and the generated chromatic aberration is also large, therefore, in order to reduce the size of the display screen and the whole display device, a lens is required to be arranged in an optical system for performing chromatic aberration correction to a higher extent, for example, a lens for correcting chromatic aberration is arranged between the display screen and the first lens; when the spherical surface of the first lens unit is a concave surface, a larger display screen can be adapted, and chromatic aberration can be eliminated.
Of course, the first lens unit, the second lens unit and the reflection unit may also be a single lens, and the dual spherical prism (2) can be obtained only by respectively gluing the first lens unit and the second lens unit with the reflection unit, and the schematic structural diagram of the dual spherical prism (2) being a dual glued prism refers to fig. 5.
The reflecting unit comprises an inclined plane, the reflecting unit is plated with a reflecting material to form a reflecting surface, and the reflecting surface is formed by plating a film with high reflectivity on the inclined plane of the reflecting unit. If the first lens unit, the second lens unit and the reflection unit are single lenses, the reflection unit is equivalent to a triangular prism, the bonding surfaces of the reflection unit, the first lens unit and the second lens unit are two rectangular surfaces opposite to the inclined surface of the triangular prism, and the reflection surface of the reflection unit is formed by plating a film with high reflectivity on the inclined surface of the triangular prism.
In the above embodiment, the dual spherical prism (2) includes two spherical surfaces and a reflecting surface, the two spherical surfaces and the reflecting surface are integrated in one prism, and the optical axes of the two spherical surfaces intersect, that is, the first lens unit, the second lens unit and the reflecting unit are integrated in the dual spherical prism (2), and the optical axis of the first lens unit intersects with the optical axis of the second lens unit, so that the dual spherical prism (2) has a light turning function, thereby achieving light turning, avoiding that the unidirectional length of the optical lens system is too long, and making the volume of the optical lens system smaller and more portable; secondly, the first lens unit, the second lens unit and the reflection unit are integrated in the double-spherical prism (2), so that the number of lenses can be reduced, the assembly space of the lenses can be saved, and the volume miniaturization of the whole optical lens system is realized.
In order to reduce the volume of two spherical prisms (2), the embodiment of the utility model provides a VR display device, as shown in FIG. 2, except including two spherical prisms (2) and display screen (4), still include: a first lens (1); the first lens (1) and the display screen (4) are not coaxial; the double-spherical prism (2) comprises a first lens unit, a second lens unit and a reflection unit, wherein the reflection unit is positioned between the first lens unit and the second lens unit, the first lens unit and the second lens unit are both spherical lenses, and the optical axis of the first lens unit is intersected with the optical axis of the second lens unit; the first lens unit is close to the display screen (4) and is coaxial with the display screen (4); the second lens unit is close to the first lens (1) and is coaxial with the first lens (1);
the reflection unit is plated with a reflection material to form a reflection surface, the optical axis of the first lens unit and the optical axis of the second lens unit intersect at the reflection unit, so that after virtual reality image light from the display screen (4) is transmitted from the first lens unit, reflection occurs on the reflection surface, and the reflected image light forms an enlarged virtual image after being transmitted from the second lens unit and the first lens (1) in sequence.
In order to ensure that the volume of the double spherical prism (2) is not too large and further reduce the volume of the whole optical lens system, the material of the double spherical prism (2) is high-refractive-index and high-dispersion-coefficient material, for example, the refractive index n is selecteddPMMA glass greater than 1.7. In order to increase the field angle of the optical lens system, it is necessary to add a lens having a focal length as small as possible between the second lens unit and the human eyeThe lens (1) is used for matching with the double-spherical prism (2) to adjust the whole focal length of the optical lens system, and preferably, the first lens (1) is a positive lens, and the focal length of the first lens (1) is as small as possible, but the too small focal length can cause difficulty in aberration correction. In the embodiment of the present invention, the suitable range of the focal length of the first lens (1) is: 17mm<f’<30mm。
According to actual needs, the first lens (1) is also made of a material with high refractive index and high dispersion coefficient. The double-spherical prism (2) is matched with the first lens (1), and partial chromatic aberration of the optical lens system can be reduced, for example, the spherical surface of the second lens unit of the double-spherical prism (2) is a convex surface (a concave surface along the light transmission direction), the surface of the first lens (1) close to the second lens unit is a convex surface, and the convex surface of the second lens unit is matched with the convex surface of the first lens (1), so that partial chromatic aberration can be reduced.
In a preferred embodiment, the first lens (1) is a positive lens, one surface of the first lens (1) close to the second lens unit is a convex surface, and the convex surface is an aspheric surface; one surface of the first lens (1) far away from the second lens unit is a concave surface, and the concave surface is an aspheric surface or a spherical surface.
The focal power of the first lens (1) is mainly borne by the convex surface, so that the curvature of the convex surface is larger, the caused primary and high-order aberration is also larger, the convex surface needs to adopt an aspheric lens, the concave surface is matched with the convex surface to select the surface type, if the convex surface adopts the aspheric surface, the integral aberration can be reduced to the tolerance range, the concave surface can adopt the spherical surface, and if the convex surface is still larger, or the integral aberration can not be reduced to the reasonable range, the concave surface also needs to adopt the aspheric surface.
The first lens (1) is an aspheric lens made of PMMA, wherein the convex surface of the first lens (1) is the aspheric lens, the aspheric lens can be processed and made in injection molding and other modes, and spherical aberration, coma aberration and astigmatism can be effectively reduced by using the aspheric lens.
In a preferred embodiment, the first lens (1) is a double-aspheric lens made of PMMA, that is, the convex surface and the concave surface of the first lens (1) are both aspheric lenses.
When the spherical surface of the first lens unit is a convex surface, the size of the display screen is limited and cannot be too large, so that the resolution of the display screen is required to be improved, and the generated chromatic aberration is also large, so that in order to reduce the size of the display screen, a lens is required to be arranged in an optical system for performing chromatic aberration correction to a higher extent, for example, a lens for correcting chromatic aberration is arranged between the display screen and the first lens. Based on this, the embodiment of the present invention provides a VR display device, as shown in fig. 3, which includes a second lens (3) in addition to the dual spherical prism (2) and the display screen (4).
The double-spherical prism (2) comprises a first lens unit, a second lens unit and a reflecting unit; the first lens unit is close to the display screen (4), the first lens unit is coaxially arranged with the display screen (4), and the optical axis of the first lens unit is intersected with the optical axis of the second lens unit;
the first lens unit and the second lens unit are both spherical lenses;
the reflection unit is positioned between the first lens unit and the second lens unit, the reflection unit is plated with a reflection material to form a reflection surface, so that after the virtual reality image light from the display screen (4) is transmitted from the first lens unit, the reflection occurs on the reflection surface, and the reflected image light forms an enlarged virtual image after being transmitted from the second lens unit;
the second lens (3) is positioned between the display screen (4) and the double-spherical prism (2), and the second lens (3) and the double-spherical prism (2) are combined into a double-cemented spherical prism; the second lens (3) is a biconcave lens, one concave surface of the second lens (3) close to the double-spherical prism (2) is cemented with the spherical surface (S2) of the first lens unit, and the spherical surface (S2) of the first lens unit is a convex surface.
Of course, when the second lens (3) is positioned between the display screen (4) and the double-spherical prism (2), the second lens (3) and the first lens unit can also be coaxially arranged without being glued with the double-spherical prism (2).
The embodiment of the utility model provides an in, combine second lens (3) and two spherical prism (2) for two gluey spherical prism, can reduce the assembly space, be favorable to reducing VR display device's volume.
The purpose of adding the second lens (3) is to reduce chromatic aberration of the optical lens system, compared to the VR display device of the above embodiment, one of which, the two concave surfaces of the second lens (3) have the effect of canceling out the chromatic aberration with each other; second, the second lens (3) is matched with the spherical surface (S2) of the first lens unit of the double spherical prism (2) to reduce chromatic aberration. One surface of the second lens (3) which is bonded with the first lens unit is a concave surface, the spherical surface of the first lens unit is a convex surface, and after the first lens unit is bonded with the second lens (3), the negative chromatic aberration of the second lens (3) and the positive chromatic aberration of the first lens unit are mutually offset, so that the whole chromatic aberration of the optical lens system is reduced.
In order to better reduce the overall chromatic aberration of the optical lens system, the second lens (3) is a biconcave lens, and the curvatures of the two concaves are the same.
The second lens (3) is made of high-refractive-index and low-dispersion glass. In order to obtain an optical component with a more compact structure, the second lens (3) and the double-spherical prism (2) form a double-gluing spherical prism, namely, the concave surface of the second lens (3) is tightly attached to the convex surface of the first lens unit, so that chromatic aberration of an optical lens system can be effectively reduced, chromatic aberration correction is facilitated when the chromatic aberration coefficient difference of the two is larger, and meanwhile, the two lenses are glued together, so that assembly is facilitated, and assembly tolerance is reduced.
The following describes the display screen (4), the first lens unit, the second lens unit, the reflection unit, the first lens (1), and the second lens (3) in the above VR display devices, respectively.
In the VR display device, the optical axis of the first lens unit intersects the optical axis of the second lens unit, and specifically, the optical axis of the first lens unit may be perpendicular to the optical axis of the second lens unit, or may not be perpendicular to the optical axis of the second lens unit.
In a preferred embodiment, the optical axis of the first lens unit is perpendicular to the optical axis of the second lens unit, and the reflecting surfaces of the reflecting unit respectively form 45 ° angles with the optical axis of the first lens unit and the optical axis of the second lens unit. See fig. 4 and 5. Therefore, the display screen is located in the longitudinal direction, the second lens unit and the first lens (1) can be located in the transverse direction, human eyes are close to the first lens (1), then the human eyes are also located in the transverse direction, and the reflecting surface of the reflecting unit is an inclined surface inclined by 45 degrees along the longitudinal direction or the transverse direction. The optical axis of the second lens unit and the optical axis of the first lens (3) are not coaxial with the display screen, and the reflecting surface realizes the adjustment of the optical path, so that the unidirectional length of the optical lens system is avoided from being too long, and the volume of the optical lens system is smaller and lighter.
Among the above-mentioned VR display device, the display screen adopts 0.7 cun or 0.5 cun screen, along with the change of optical device size, the size of display screen can also adopt other arbitrary suitable dimensions.
In the VR display device, the double spherical prism (2) is preferably made of a glass having a high refractive index and a high dispersion coefficient, and the double spherical prism (2) is preferably an integral structure in which a first lens unit, a second lens unit, and a reflection unit are combined, as shown in fig. 1a and 1 b. First lens unit, second lens unit and reflection unit combine structure as an organic whole, can avoid assembly error, are favorable to VR display device's compact.
Optionally, in the VR display device, the dual spherical prism (2) may also be a dual spherical cemented prism in which the first lens unit and the second lens unit are cemented with the reflection unit, respectively. For example, as shown in fig. 2, the first lens unit is a first plano-convex lens, the second lens unit is a second plano-convex lens, the reflection unit is an isosceles right prism, the reflection surface is an inclined surface of the isosceles right prism, a plane of the first plano-convex lens is cemented with a rectangular right-angled prism surface of the isosceles right prism, and a plane of the second plano-convex lens is cemented with another rectangular right-angled prism surface of the isosceles right prism, such that an optical axis of the first plano-convex lens and an optical axis of the second plano-convex lens intersect at the inclined surface of the isosceles right prism to form a double cemented prism, and if a convex surface of the first plano-convex lens and a convex surface of the second plano-convex lens are spherical surfaces, the formed double cemented prism is a double spherical cemented.
The spherical surface (S2) of the first lens unit is a convex surface, so that the virtual reality image light from the display screen becomes an enlarged virtual image after passing through the convex surface of the first lens unit, and the convex surface of the first lens unit can also correct a part of aberration. The spherical surface (S1) of the second lens unit is convex, so that the virtual reality image is magnified again by the spherical surface (S1) of the second lens unit when the virtual reality image passes through the spherical surface (S1) of the second lens unit after being reflected by the reflection surface.
The curvatures of the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit may be the same or different.
Preferably, in the double-spherical prism (2) of the VR display device, curvatures of a spherical surface (S2) of the first lens unit and a spherical surface (S1) of the second lens unit are the same.
Preferably, a distance from the spherical surface (S2) of the first lens unit to the center of the reflection surface and a distance from the spherical surface (S1) of the second lens unit to the center of the reflection surface are each larger than the side of the display screen where the width is largest.
Preferably, the surfaces of the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit are plated with anti-reflection films of the same specification, the anti-reflection films may be of a three-layer film structure, the outermost layer may be magnesium fluoride MgF2 with anti-reflection λ/4 wavelength, the intermediate layer is zirconium oxide ZrO2 with anti-reflection λ/2 wavelength, the innermost layer is cerium fluoride CeF3 with anti-reflection λ/4 wavelength and is close to the glass substrate, or other off-the-shelf anti-reflection films, wherein λ is a visible light wavelength, such as λ 550nm, and the λ value can be flexibly selected according to the use environment of the device, so as to improve the utilization rate of light.
Because of PMMA has workable, density only is half the characteristics of common glass, for the compact structure who guarantees above-mentioned VR display device, reduces the volume, lightens weight simultaneously, the embodiment of the utility model provides an in first lens (1), two spherical prism (2) the glass material choose for use PMMA (commonly known as organic glass).
According to actual needs, the double-spherical prism (2) and the first lens (1) are made of materials with high refractive index and high dispersion coefficient, and the chromatic aberration can be partially reduced by matching the two materials, for example, the spherical surface of the second lens unit of the double-spherical prism (2) is a convex surface (a concave surface along the light transmission direction), the surface shape of the first lens (1) close to the second lens unit is a convex surface, and the convex surface of the second lens unit is matched with the convex surface of the first lens (1), so that partial chromatic aberration can be reduced.
The first lens (1) is a positive lens, one surface of the first lens (1) close to the second lens unit is a convex surface, and the convex surface is an aspheric surface; one surface of the first lens (1) far away from the second lens unit is a concave surface, and the concave surface is an aspheric surface or a spherical surface. The focal power of the first lens (1) is mainly borne by the convex surface, so that the curvature of the convex surface is larger, the caused primary and high-order aberration is also larger, the convex surface needs to adopt an aspheric lens, the concave surface is matched with the convex surface to select the surface type, if the convex surface adopts the aspheric surface, the integral aberration can be reduced to the tolerance range, the concave surface can adopt the spherical surface, and if the convex surface is still larger, or the integral aberration can not be reduced to the reasonable range, the concave surface also needs to adopt the aspheric surface.
The first lens (1) is an aspheric lens made of PMMA, and can be processed and manufactured in a mode of injection molding and the like, and spherical aberration, coma aberration and astigmatism can be effectively reduced by using the aspheric lens. For example, the first lens (1) is a double-aspheric lens made of PMMA, and the convex surface and the concave surface of the first lens (1) are both aspheric lenses. See table 1 for specifications. The curvature radius, conic coefficient, thickness, and 2-order coefficient, 4-order coefficient, 6-order coefficient, 8-order coefficient, 10-order coefficient, 12-order coefficient, and 14-order coefficient in table 1 are all characterization parameters of the aspheric lens.
In order to reduce reflected light and increase light transmittance, the light passing surface of the first lens (1), namely the convex surface and the concave surface of the first lens (1), can be coated with antireflection films in a visible light range. At least one of the convex surface and the concave surface of the first lens (1) is plated with an antireflection film, the antireflection film can be of a three-layer film structure, the outermost layer can be magnesium fluoride MgF2 with antireflection lambda/4 wavelength, the middle layer is zirconium oxide ZrO2 with antireflection lambda/2 wavelength, the innermost layer is close to a glass substrate and is cerium fluoride CeF3 with antireflection lambda/4 wavelength, and the antireflection film can also be other off-the-shelf designed antireflection films, wherein lambda is visible light wavelength, for example, lambda is 550nm, and the lambda value can be flexibly selected according to the use environment of equipment so as to improve the utilization rate of light. The antireflection film can also be other off-the-shelf antireflection films.
In the VR display device, the image light from the display screen is transmitted through the convex surface of the first lens unit and then is totally reflected by the reflective surface of the reflective unit, so as to reduce the influence of external stray light, the reflective surface is a total reflective surface, the reflective surface can be formed by plating a total reflective film on the reflective unit, and the reflective material is a silver-plated reflective film or other metal dielectric reflective films.
TABLE 1
| Concave surface | Convex surface | |
| Surface type | EVENASPH (aspheric surface) | EVENASPH (aspheric surface) |
| Radius of curvature | -22.5348mm | -10mm |
| Coefficient of cone | 3.106648 | 0.231066 |
| Thickness of | 3.987763mm | |
| 2 degree coefficient | -0.013687262 | -0.014468131 |
| 4 degree coefficient | -4.0381658e-005 | -9.912532e-006 |
| Coefficient of order 6 | -3.6628571e-005 | -8.0819568e-006 |
| Coefficient of order 8 | 1.6001038e-006 | 2.0284088e-008 |
| 10 th order coefficient | 2.988908e-008 | 6.7782227e-009 |
| Coefficient of degree 12 | -4.3495985e-009 | -1.617931e-010 |
| 14 degree coefficient | 1.2549511e-010 | 9.5454405e-013 |
| 16 degree coefficient | 1.2549511e-010 | -1.7263027e-015 |
In order to ensure the light weight of the whole volume and simultaneously have better optical effect, the focal length of the first lens (1) is f ', 17mm < f' <30mm, and the volume of an optical lens system consisting of the double spherical prism (2) and the first lens (1) is 18mm x 14mm x 15 mm. This requires that the distance between the center point of the spherical surface (S1) of the second lens unit and the center point of the reflecting surface, and the distance between the center point of the spherical surface (S2) of the first lens unit and the center point of the reflecting surface are larger than the width of the longer side of the display screen, but too large results in a large increase in the volume of the whole optical lens system.
In order to ensure that the volume of the double-spherical prism (2) is not too large, the material of the double-spherical prism (2) is selected from glass with refractive index ndGreater than 1.7. In addition, the first lens (1) matched with the double spherical prism (2) is a positive lens, the focal length is as small as possible, but the aberration correction is difficult due to the fact that the focal length is too small.
In the embodiment of the present invention, the focal length of the first lens (1) is f ', 17mm < f' <30 mm. In order to reduce the processing difficulty and the high-level aberration, the curvature radiuses of the two spherical surfaces of the double-spherical prism (2) are not too small, and the value range of the curvature radius of the spherical surface S1 of the second lens unit is as follows: 10mm < R <20mm, and the radius of curvature of the spherical surface S2 of the first lens unit has a range of: 10mm < R <20 mm.
Preferably, the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit have a radius of curvature of R1, 10mm < R1<20 mm.
As shown in fig. 6, in the schematic optical path of the optical lens system composed of the double spherical prism (2) and the first lens (1), the virtual reality image light from the display screen (4) is transmitted through the first lens unit, and passes through the spherical surface (S2) of the first lens unit to form an enlarged virtual image, the virtual reality image light transmitted to the reflective surface is reflected (or totally reflected) on the reflective surface, and the reflected (or totally reflected) image light is transmitted to the spherical surface (S1) of the second lens unit and the first lens (1) in sequence, and is enlarged again on the convex surface of the spherical surface (S1) of the second lens unit. Because the convex surface of the second lens unit close to the first lens (1) is matched with the concave surface of the first lens (1) close to the second lens unit, partial chromatic aberration can be mutually offset, and the chromatic aberration of an image formed by image light after passing through the spherical surface (S1) of the second lens unit and the first lens (1) is small.
In the above embodiment, the dual spherical prism (2) includes two spherical surfaces (i.e., the spherical surface (S2) of the first lens unit, the spherical surface (S1) of the second lens unit, and one reflection surface, the two spherical surfaces and the one reflection surface are integrated in one prism, and the optical axes of the two spherical surfaces intersect at the reflection surface, that is, the first lens unit, the second lens unit, and the reflection unit are integrated in the dual spherical prism (2), and the optical axis of the first lens unit and the optical axis of the second lens unit intersect at the reflection unit, which has the following effects:
firstly, the double-spherical prism (2) has a light steering function, aberration can be corrected through two spherical surfaces, distortion is reduced, an image is enlarged, the first lens (1) is matched with the spherical surface (S1) of the second lens unit, the chromatic aberration of a part of images is reduced, and the imaging quality is improved;
secondly, the second lens unit is matched with the first lens (1) to reduce chromatic aberration, and the small focal length of an optical lens system consisting of the double-spherical prism (2) and the first lens (1) can increase the field angle of the VR display device with the same volume;
thirdly, the first lens unit, the second lens unit and the reflection unit are integrated in the double-spherical prism (2), so that the number of lenses can be reduced, the assembly space of the lenses can be saved, and the volume miniaturization of the whole optical lens system is realized;
fourthly, the optical axis of the second lens unit and the optical axis of the first lens (3) are not coaxial with the display screen, so that the turning of light is realized, the unidirectional length overlong of the optical lens system is avoided, and the volume of the optical lens system is smaller and lighter.
The embodiment of the present invention provides still another preferred VR display device, as shown in fig. 7, in addition to including first lens (1), double spherical prism (2) and display screen (4), further including: a second lens (3); the second lens (3) is positioned between the display screen (4) and the double-spherical prism (2), and the second lens (3) and the double-spherical prism (2) are combined into a double-cemented spherical prism; the second lens (3) is a biconcave lens, one concave surface of the second lens (3) close to the double-spherical prism (2) is cemented with the spherical surface (S2) of the first lens unit, and the spherical surface (S2) of the first lens unit is a convex surface. The specific contents of the first lens (1), the double-spherical prism (2) and the display screen (4) are referred to the above embodiments, and will not be described in detail here.
The embodiment of the utility model provides an in, combine second lens (3) and two spherical prism (2) for two gluey spherical prism, can reduce the assembly space, be favorable to reducing VR display device's volume.
After the second lens (3) is added, a perspective view of an optical lens system composed of the second lens (3), the double spherical prism (2) and the first lens (1) is shown in fig. 8.
The second lens (3) is added to reduce chromatic aberration of the entire optical lens system, and the second lens (3) is matched with the spherical surface (S2) of the first lens unit of the double-spherical prism (2) to reduce chromatic aberration, and the principle is as follows: firstly, the two concave surfaces of the second lens (3) have the function of mutually offsetting chromatic aberration; secondly, the surface of the second lens (3) bonded with the first lens unit is a concave surface, the spherical surface of the first lens unit is a convex surface, and after the first lens unit is bonded with the second lens (3), the negative chromatic aberration of the second lens (3) and the positive chromatic aberration of the first lens unit are mutually offset, so that the whole chromatic aberration of the optical lens system is reduced. In order to better reduce the overall chromatic aberration of the optical lens system, the second lens (3) is a biconcave lens, and the curvatures of the two concaves are the same.
The second lens (3) is made of high-refractive-index and low-dispersion glass. In order to obtain an optical component with a more compact structure, the second lens (3) and the double-spherical prism (2) form a double-gluing spherical prism, namely, the concave surface of the second lens (3) is tightly attached to the convex surface of the first lens unit, so that chromatic aberration of an optical lens system can be effectively reduced, chromatic aberration correction is facilitated when the chromatic aberration coefficient difference of the two is larger, and meanwhile, the two lenses are glued together, so that assembly is facilitated, and assembly tolerance is reduced.
Furthermore, in order to increase the light transmittance, the dual concave surface of the second lens (3) may be plated with an anti-reflection film, the anti-reflection film may be a three-layer film structure, the outermost layer may be magnesium fluoride MgF2 with anti-reflection λ/4 wavelength, the middle layer may be zirconium oxide ZrO2 with anti-reflection λ/2 wavelength, the innermost layer is close to the glass substrate and is cerium fluoride CeF3 with anti-reflection λ/4 wavelength, or may be other off-the-shelf anti-reflection films, wherein λ is a visible light wavelength, such as λ 550nm, and the λ value may be flexibly selected according to the use environment of the device, so as to increase the light utilization rate. The antireflection film can also be other off-the-shelf antireflection films.
After the second lens (3) is added, the optical lens system consisting of the second lens (3), the double-spherical prism (2) and the first lens (1) has the volume of less than 18 x 17 x 19mm and the thickness of less than 20 mm. In order to ensure the light weight of the whole volume and simultaneously have better optical effect, the focal length of the first lens (1) is f ', 17mm < f' <30mm, and the total focal length of an optical lens system consisting of the second lens (3), the double-spherical prism (2) and the first lens (1) is f, wherein 12mm < f <17mm, so that the volume of the VR display device is 18mm 16mm 15 mm. This requires that the distance between the center point of the spherical surface (S1) of the second lens unit and the center point of the reflecting surface, and the distance between the center point of the spherical surface (S2) of the first lens unit and the center point of the reflecting surface are larger than the width of the longer side of the display screen, but too large results in a large increase in the volume of the whole optical lens system.
In order to ensure that the volume of the double-spherical prism (2) is not too large, the material of the double-spherical prism (2) is selected from glass with refractive index ndGreater than 1.7, in addition, with two spherical prism (2) complex first lens (1) be positive lens, the focus is as little as possible, but focus undersize can lead to the aberration to rectify the difficulty, preferred, in the embodiment of the utility model provides an, the focus of first lens (1) is f', 17mm<f’<30 mm. In order to reduce the processing difficulty and the high-level aberration, the curvature radiuses of the two spherical surfaces of the double-spherical prism (2) are not too small, and the value range of the curvature radius of the spherical surface S1 of the second lens unit is as follows: 10mm<R<20mm, radius of curvature of spherical surface S2 of first lens unitThe value ranges are: 10mm<R<20 mm. In order to ensure that the screen of the display screen has enough space and reduce the aberration of the whole optical lens system as much as possible, the curvature radius of the concave surface (S3) of the second lens (3) close to one side of the display screen has the value range of 10mm<R<20mm。
Specifically, in the optical lens system composed of the second lens (3), the double-spherical prism (2) and the first lens (1), the specification and the material of the spherical surface (S1) of the second lens unit, the spherical surface (S2) of the first lens unit and the concave surface (S3) of the second lens (3) facing the display screen are shown in table 2.
TABLE 2
Preferably, the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit have a radius of curvature of R1, 10mm < R1<20 mm. The curvature radius of the concave surface (S3) of the second lens (3) close to the display screen is R2, and 10mm < R2<20 mm.
After the second lens (3) is added, the optical path schematic diagram of the optical lens system composed of the second lens (3), the double-spherical prism (2) and the first lens (1) is shown in fig. 9, the virtual reality image light from the display screen (4) firstly enters the concave surface (S3) of the second lens (3) facing the display screen (4), then is transmitted to the concave surface (i.e. the surface cemented with the S2) of the second lens (3) and the first lens unit, the negative and positive chromatic aberration of the virtual reality image light is counteracted by the cooperation of the concave surface (S3) of the second lens (3) and the concave surface cemented with the first lens unit, then is transmitted to the first lens unit, becomes an enlarged virtual image on the spherical surface (S2) of the first lens unit, the virtual reality image light continuously transmitted to the reflection surface is reflected (or totally reflected) on the reflection surface, and the image light sequentially transmitted to the spherical surface (S1) of the second lens unit and the first transmission surface (S2) of the second lens unit and the first transmission surface The mirror (1) is enlarged again on the convex surface of the spherical surface (S1) of the second lens unit. Because the convex surface of the second lens unit close to the first lens (1) is matched with the convex surface of the first lens (1) close to the second lens unit, partial chromatic aberration can be mutually offset, and the chromatic aberration of an image formed by image light after passing through the spherical surface (S1) of the second lens unit and the first lens (1) is small.
In the above embodiment, the dual spherical prism (2) includes two spherical surfaces (i.e., the spherical surface (S2) of the first lens unit, the spherical surface (S1) of the second lens unit, and one reflection surface, the two spherical surfaces and the one reflection surface are integrated in one prism, and the optical axes of the two spherical surfaces intersect at the reflection surface, that is, the first lens unit, the second lens unit, and the reflection unit are integrated in the dual spherical prism (2), and the optical axis of the first lens unit and the optical axis of the second lens unit intersect at the reflection unit, which has the following effects:
firstly, the double-spherical prism (2) has a light steering function, aberration can be corrected through two spherical surfaces, distortion is reduced, an image is enlarged, the first lens (1) is matched with the spherical surface (S1) of the second lens unit, the chromatic aberration of a part of images is reduced, and the imaging quality is improved;
secondly, the second lens unit is matched with the first lens (1) to reduce chromatic aberration, and the small focal length of an optical lens system consisting of the double-spherical prism (2) and the first lens (1) can increase the field angle of the VR display device with the same volume;
thirdly, the first lens unit, the second lens unit and the reflection unit are integrated in the double-spherical prism (2), so that the number of lenses can be reduced, the assembly space of the lenses can be saved, and the volume miniaturization of the whole optical lens system is realized; fourthly, the optical axis of the second lens unit and the optical axis of the first lens (3) are not coaxial with the display screen, so that the turning of light is realized, the unidirectional length overlong of the optical lens system is avoided, and the volume of the optical lens system is smaller and lighter.
In addition, increase a biconcave lens between display screen and first lens unit, can reduce the colour difference of whole optical lens system, the reduction of colour difference and the reduction of whole optical lens system's focus for the angle of view of whole VR display device grow, the angle of view of VR display device under the same volume of conventionality is 40-50, the utility model provides a VR display device compares with the virtual reality device under the same volume of conventionality, and the angle of view can reach 60-80.
To sum up, the utility model discloses VR display device has the characteristics of eliminating image colour difference, miniaturization, big angle of vision and reducing image distortion, and VR display device presents the image quality who wears the user and can promote, can strengthen the sense of immersing of using VR display device's user. Under the condition of low requirement on chromatic aberration, in order to further reduce the process difficulty and further reduce the volume of the optical lens system, the second lens (3) is removed, the double-cemented prism (2) is changed into a double-spherical prism, and the double-spherical prism (2) and the first lens (1) form an optical lens system, so that the volume of the optical lens system is about 18mm 14mm 15mm, and the chromatic aberration of the optical lens system is partially increased. According to actual needs, the double-spherical prism (2) and the first lens (1) are made of materials with high refractive index and high dispersion coefficient, and the materials are matched with each other to partially reduce chromatic aberration. Specifically, the second lens unit of the double-spherical prism (2) is close to the convex surface of the first lens (1) and is matched with the convex surface of the first lens (1) close to the second lens unit, so that partial chromatic aberration can be reduced.
Based on same utility model the design, the embodiment of the utility model provides a still provide a wear-type VR display device, any kind of VR display device in the above-mentioned embodiment makes the utility model discloses a wear-type VR display device has the characteristics of little volume, colour difference correction and large visual angle.
The embodiment of the utility model provides a for the small-size light-duty of adaptation virtual reality equipment, the VR display device that provides has compact structure, the high-quality optical lens system of formation of image, and the angle of vision of virtual reality equipment is 40-50 under the same volume of conventionality, the embodiment of the utility model provides a VR display device compares with virtual reality equipment under the same volume of conventionality, and the angle of vision can reach 60-80. And the embodiment of the utility model provides a VR display device has simple structure, and the technology preparation degree of difficulty is low, the characteristics of easy volume production.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (14)
1. A Virtual Reality (VR) display device, comprising: the double-spherical prism (2) and the display screen (4);
the double-spherical prism (2) comprises a first lens unit, a second lens unit and a reflection unit; the first lens unit is close to the display screen (4), the first lens unit is coaxially arranged with the display screen (4), and the optical axis of the first lens unit is intersected with the optical axis of the second lens unit;
the first lens unit and the second lens unit are both spherical lenses;
the reflection unit is located between the first lens unit and the second lens unit, and the reflection unit is plated with a reflection material to form a reflection surface, so that after the virtual reality image light from the display screen (4) is transmitted from the first lens unit, the reflection occurs on the reflection surface, and the reflected image light forms an enlarged virtual image after being transmitted from the second lens unit.
2. The VR display device of claim 1, further comprising a first lens (1), said first lens (1) being adjacent to and disposed coaxially with said second lens unit.
3. The VR display device of claim 2, further comprising a second lens (3);
the second lens (3) is positioned between the display screen (4) and the double-spherical prism (2), and the second lens (3) and the double-spherical prism (2) are combined into a double-cemented spherical prism;
wherein the second lens (3) is a biconcave lens, one concave surface of the second lens (3) near the biaspheric prism (2) is cemented with the spherical surface (S2) of the first lens unit, wherein the spherical surface (S2) of the first lens unit is convex.
4. The VR display device of claim 2, wherein the first lens (1) is a positive lens, and a surface of the first lens (1) adjacent to the second lens unit is a convex surface, and the convex surface is an aspheric surface; one surface of the first lens (1) far away from the second lens unit is a concave surface, and the concave surface is an aspheric surface or a spherical surface.
5. The VR display device of claim 2, where the first lens (1) has a focal length f ', where 17mm < f' <30 mm.
6. The VR display device of any of claims 1 to 3, wherein an optical axis of the first lens unit is perpendicular to an optical axis of the second lens unit, and the reflective surfaces of the reflective unit are angled at 45 degrees with respect to the optical axes of the first and second lens units, respectively.
7. The VR display device of claim 6,
the double-spherical prism (2) is an integrated structure formed by combining the first lens unit, the second lens unit and the reflecting unit; or,
the double-spherical-surface prism (2) is a double-spherical-surface cemented prism formed by respectively cementing the first lens unit and the second lens unit with the reflecting unit.
8. The VR display device of claim 7, wherein curvatures of a spherical surface (S2) of the first lens unit and a spherical surface (S1) of the second lens unit are the same.
9. The VR display of claim 8, wherein a distance from a spherical surface (S2) of the first lens unit to a center of the reflective surface and a distance from a spherical surface (S1) of the second lens unit to the center of the reflective surface are each greater than a side of the display screen where the width is largest.
10. The VR display device of claim 4, wherein at least one of the convex and concave surfaces of the first lens (1) is coated with an anti-reflection film.
11. The VR display device of claim 1, wherein surfaces of the spherical surface (S2) of the first lens unit and the spherical surface (S1) of the second lens unit are plated with a same antireflection film.
12. The VR display of claim 1, wherein the reflective surface is a fully reflective surface and the reflective material is a silver-plated reflective film or other metal dielectric reflective film.
13. A VR display device as claimed in claim 3, characterized in that the biconcave surface of the second lens (3) is coated with an anti-reflection coating.
14. A head-mounted VR display device comprising the VR display apparatus of any one of claims 1 to 13.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106226907A (en) * | 2016-08-31 | 2016-12-14 | 深圳超多维科技有限公司 | A kind of VR display device and wear-type VR display device |
| CN110346933A (en) * | 2018-09-30 | 2019-10-18 | 京东方科技集团股份有限公司 | Optical lens mould group and virtual reality device |
| WO2020244213A1 (en) * | 2019-06-03 | 2020-12-10 | 歌尔股份有限公司 | Compensation lens set and virtual reality device having same |
| WO2021023212A1 (en) * | 2019-08-05 | 2021-02-11 | University Of Central Florida Research Foundation, Inc. | Head-mounted display apparatus and optical display system |
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2016
- 2016-08-31 CN CN201621035420.4U patent/CN206224048U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106226907A (en) * | 2016-08-31 | 2016-12-14 | 深圳超多维科技有限公司 | A kind of VR display device and wear-type VR display device |
| CN106226907B (en) * | 2016-08-31 | 2019-02-05 | 深圳超多维科技有限公司 | A kind of VR display device and wear-type VR show equipment |
| CN110346933A (en) * | 2018-09-30 | 2019-10-18 | 京东方科技集团股份有限公司 | Optical lens mould group and virtual reality device |
| US11543657B2 (en) | 2018-09-30 | 2023-01-03 | Beijing Boe Optoelectronics Technology Co., Ltd. | Optical lens module and virtual reality device |
| WO2020244213A1 (en) * | 2019-06-03 | 2020-12-10 | 歌尔股份有限公司 | Compensation lens set and virtual reality device having same |
| WO2021023212A1 (en) * | 2019-08-05 | 2021-02-11 | University Of Central Florida Research Foundation, Inc. | Head-mounted display apparatus and optical display system |
| CN114730083A (en) * | 2019-08-05 | 2022-07-08 | 佛罗里达中央大学研究基金会 | Head-mounted display device and optical display system |
| CN114730083B (en) * | 2019-08-05 | 2024-03-19 | 佛罗里达中央大学研究基金会 | Head-mounted display device and optical display system |
| US12007566B2 (en) | 2019-08-05 | 2024-06-11 | University Of Central Florida Research Foundation, Inc. | Head-mounted display apparatus and optical display system |
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