CN220208006U - Ultrathin enhanced realistic near-to-eye display device - Google Patents

Ultrathin enhanced realistic near-to-eye display device Download PDF

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Publication number
CN220208006U
CN220208006U CN202322152975.3U CN202322152975U CN220208006U CN 220208006 U CN220208006 U CN 220208006U CN 202322152975 U CN202322152975 U CN 202322152975U CN 220208006 U CN220208006 U CN 220208006U
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imaging
fresnel lens
prism
unit
lens unit
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夏傑
陈朋波
杜晖
江超群
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Hangzhou Companion Technology Co ltd
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Hangzhou Companion Technology Co ltd
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Abstract

The utility model discloses an ultrathin enhanced realistic near-to-eye display device, which comprises a display image source, an imaging prism unit and a second Fresnel lens unit, wherein: the display image source is used for emitting imaging light rays to the imaging prism unit; the imaging prism unit is provided with a first semi-transparent semi-reflective film at one side close to the human eye and is used for reflecting imaging light rays to the second Fresnel lens unit; the second Fresnel lens unit is matched with the adjacent surface shape of the imaging prism unit, and the second Fresnel lens unit is used for reflecting imaging light rays and then entering human eyes for imaging through the imaging prism unit and transmitting real scene light rays and then entering human eyes for imaging through the imaging prism unit. The near-eye display device is beneficial to increasing the angle of view and reducing the overall thickness, improving the imaging quality and reducing the cost.

Description

Ultrathin enhanced realistic near-to-eye display device
Technical Field
The utility model belongs to the technical field of near-eye display, and particularly relates to an ultrathin enhanced realistic near-eye display device.
Background
In a near-eye display system, if a large field angle (FOV) display effect is to be formed, a larger-caliber imaging system is generally required, and meanwhile, the overall thickness is also greatly increased, as in the existing near-eye reality scheme with augmented reality, due to the design of the optical scheme, the design is limited by the caliber and thickness of a curved lens, while the large FOV is provided, a large-caliber and large-thickness curved lens is required, and a thicker frame is generally required, which affects the comfort and appearance of a wearer, so that the scheme is difficult to meet the requirement of the wearer on the augmented reality near-eye display device, has poor comfort and experience, and is difficult to add other functions, such as eye tracking, facial recognition and the like, which cannot be integrated, and cannot meet the use requirement of the wearer. Therefore, the development of thinning of optical systems has been promoted by the wide application and market demands of eyeglasses and other visual apparatuses, and the thinned optical scheme is applied to enhance the realistic near-to-eye display device or other visual apparatuses to reduce the thickness and weight of eyeglasses, thereby improving the comfort and the use experience of the wearer. For this reason, an enhanced realistic near-to-eye display device having a large FOV and a small thickness has been proposed.
Disclosure of Invention
The utility model aims to solve the problems and provide an ultrathin enhanced realistic near-to-eye display device which is beneficial to increasing the angle of view, reducing the overall thickness, improving the imaging quality and reducing the cost.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
the utility model provides an ultrathin enhanced realistic near-to-eye display device, which comprises a display image source, an imaging prism unit and a second Fresnel lens unit, wherein:
the display image source is used for emitting imaging light rays to the imaging prism unit;
the imaging prism unit is provided with a first semi-transparent semi-reflective film at one side close to the human eye and is used for reflecting imaging light rays to the second Fresnel lens unit;
the second Fresnel lens unit is matched with the adjacent surface shape of the imaging prism unit, and the second Fresnel lens unit is used for reflecting imaging light rays and then entering human eyes for imaging through the imaging prism unit and transmitting real scene light rays and then entering human eyes for imaging through the imaging prism unit.
Preferably, the imaging prism unit includes a first fresnel lens unit and a first prism, the first fresnel lens unit is located between the display image source and the first prism, and each optical surface of the first prism is a plane or a free-form surface.
Preferably, the focal length f of the first fresnel lens unit has a value ranging from: f is less than or equal to-30 mm or f is more than or equal to 30mm.
Preferably, the first prism is a right-angle prism, and the two right-angle optical surfaces are respectively close to the first fresnel lens unit and the second fresnel lens unit, and the inclined optical surface is close to the human eye.
Preferably, the imaging prism unit includes a second prism, and each optical surface of the second prism is a plane or a free-form surface.
Preferably, the second transflective film is attached to the imaging prism unit or the second fresnel lens unit.
Preferably, the display image source is one of an OLED display, an LCOS display, a micro display, an LBS display and a DLP display.
Preferably, each fresnel lens unit includes at least one fresnel lens.
Preferably, the tooth width of the Fresnel surface of the Fresnel lens is 0.1 mm-0.5 mm, the tooth depth is 0.2 mm-0.5 mm, and the chamfer radius is less than 0.3mm.
Preferably, the fresnel surface of each fresnel lens faces toward the side remote from the imaging prism unit.
Compared with the prior art, the utility model has the beneficial effects that:
in the prior art, the near-to-eye display device is used for viewing the external environment clearly, and a compensation lens is needed, so that the whole optical system is equal in thickness and cannot deform when being viewed from the external environment. According to the optical system, the Fresnel lens is adopted to replace a traditional compensation lens (such as a curved lens or a prism), so that the thickness of the curved lens or the prism is reduced, the purpose of thinning is achieved, and the thickness of the whole optical system is further reduced while the view angle (the view angle can reach more than 60 degrees) is increased on the basis of the same optical path by increasing the folding times of the optical path; and through reasonable setting of the tooth width, the tooth depth and the chamfer radius of the Fresnel lens, the focal length of the lens is ensured, the transmissivity of the lens is improved, astigmatism and stray light are reduced, imaging blurring or distortion is avoided, imaging quality is improved, and manufacturing difficulty and cost are reduced.
Drawings
FIG. 1 is a schematic diagram of an ultra-thin enhanced realistic near-to-eye display device according to embodiment 1 of the present utility model;
fig. 2 is a schematic structural diagram of an ultrathin enhanced active-matrix near-eye display device according to embodiment 2 of the utility model.
Reference numerals illustrate: 1. displaying an image source; 2. a first fresnel lens unit; 3. an imaging prism unit; 4. a second fresnel lens unit; 5. and (5) human eyes.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It is noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The thinning of the optical system is a technical means for reducing the size and weight of the optical system and improving the performance and efficiency of the optical system by optimizing the design of the optical element and adopting an efficient optical technology, and meanwhile, the portability and applicability of the optical system can be improved and the cost can be reduced.
Example 1:
as shown in fig. 1, an ultra-thin enhanced realistic near-eye display device includes a display image source 1, an imaging prism unit 3, and a second fresnel lens unit 4, wherein:
a display image source 1 for emitting imaging light to an imaging prism unit 3;
an imaging prism unit 3, wherein a first transflective film is arranged on one side close to the human eye 5, and the imaging prism unit 3 is used for reflecting imaging light rays to a second Fresnel lens unit 4;
the second Fresnel lens unit 4 is further provided with a second semi-transparent and semi-reflective film between the second Fresnel lens unit 4 and the imaging prism unit 3, and the second Fresnel lens unit 4 is matched with the adjacent surface shape of the imaging prism unit 3, and the second semi-transparent and semi-reflective film is used for reflecting imaging light rays to enter the human eyes 5 for imaging through the imaging prism unit 3 and transmitting real scene light rays to enter the human eyes for imaging through the imaging prism unit 3.
The near-eye display device comprises a display image source 1, an imaging prism unit 3 and a second Fresnel lens unit 4, wherein the display image source 1 is used for providing an image picture, the imaging prism unit 3 can be composed of at least one prism, the prism can be of any shape, a first semi-transparent and semi-reflective film is arranged on one side, close to a human eye 5, of the imaging prism unit 3, each optical surface of the prism can be a plane, a curved surface or a free combination of the two, the prism can be made of plastic materials or glass materials, and the first semi-transparent and semi-reflective film can be attached to the prism or plated on the prism. A second semi-transparent and semi-reflective film is arranged between the second Fresnel lens unit 4 and the imaging prism unit 3, and the second semi-transparent and semi-reflective film can be realized in a film coating mode or a film pasting mode.
The second fresnel lens unit 4 is used instead of the compensation lens in the prior art near-eye display device, such as a lens of optical power, or a prism of no optical power. The near-eye display device is optimized by utilizing the characteristics of light weight, light weight and low cost of the Fresnel lens, and the thickness of the whole optical system is further reduced while the angle of view is increased by increasing the number of times of folding the optical path.
In one embodiment, the imaging prism unit 3 includes a first fresnel lens unit 2 and a first prism, where the first fresnel lens unit 2 is located between the display image source 1 and the first prism, and each optical surface of the first prism is a plane or a free-form surface.
When the optical surface of the first prism corresponding to the first fresnel lens unit 2 or the second fresnel lens unit 4 is a plane, a flat fresnel lens can be used as a lens in the fresnel lens unit; when the optical surface of the first prism corresponding to the first Fresnel lens unit 2 or the second Fresnel lens unit 4 is a free curved surface, the lenses in the Fresnel lens units are kept to be matched with the corresponding optical surface in shape, so that better imaging quality is obtained.
In an embodiment, the focal length f of the first fresnel lens unit 2 is within the range: f is less than or equal to-30 mm or f is more than or equal to 30mm. If the focal length f of the first fresnel lens unit 2 is between-30 mm and 30mm, the curvature is too small, and the focal power is very large, and the focal power between the imaging prism unit 3 and the display image source 1 is not too large, so that the light rays at the edge and the center are generated due to the too large focal power, and the design requirement of the system is not met.
In an embodiment, the first prism is a right-angle prism, and two right-angle optical surfaces of the first prism are respectively disposed near the first fresnel lens unit 2 and the second fresnel lens unit 4, and an inclined optical surface of the first prism is disposed near the human eye.
The imaging light may be reflected for the first time on the right angle optical surface of the first prism near the second fresnel lens unit 4, reflected for the second time on the inclined optical surface of the first prism near the human eye 5, and finally reflected for the third time on the second fresnel lens unit 4, and then enters the human eye 5 through the first prism for imaging. The multi-fold optical path is realized, thereby increasing the angle of view and realizing light and thin.
In an embodiment, the second transflective film is attached to the imaging prism unit 3 or the second fresnel lens unit 4. The second semi-transparent and semi-reflective film is arranged between the second fresnel lens unit 4 and the imaging prism unit 3 and also arranged on the second fresnel lens unit 4 or the imaging prism unit 3, namely preferably attached to one of adjacent surfaces of the second fresnel lens unit 4 and the imaging prism unit 3 according to actual requirements.
In one embodiment, the display image source 1 is one of an OLED display, an LCOS display, a micro-led display, an LBS display, and a DLP display. Preferably an OLED display.
In one embodiment, each fresnel lens unit includes at least one fresnel lens.
The first fresnel lens unit 2 is a series of fresnel lenses with aberration correction function, the second fresnel lens unit 4 is a series of fresnel lenses with aberration correction and optical path reflection function, and the number of fresnel lenses in each fresnel lens unit is not limited, for example, a single fresnel lens. The fresnel lenses may be made of glass or plastic.
In one embodiment, the Fresnel surface of the Fresnel lens has a tooth width of 0.1mm to 0.5mm, a tooth depth of 0.2mm to 0.5mm, and a chamfer radius of less than 0.3mm.
In an embodiment, the fresnel surface of each fresnel lens faces away from the side of the imaging prism unit 3.
The fresnel lens comprises a series of concentric annular structures, and also can be a series of linear structures, for example, each structure comprises a series of prisms, and the angles and positions of the prism faces can be determined according to practical requirements. The tooth width, tooth depth and chamfer of fresnel lenses are the main factors affecting the optical performance.
The range of the tooth width of the Fresnel lens is 0.1 mm-0.5 mm, and the range of the tooth depth is 0.2 mm-0.5 mm. Too large a tooth width or depth can result in a shortened focal length of the lens, affect the imaging quality of the lens, and cause imaging blur or distortion. Too little tooth width or depth may result in reduced transmissivity, increased astigmatism, etc. In addition, the difficulty and cost of manufacturing the lens are increased. The chamfer radius is less than 0.3mm, and small chamfers can reduce the risk of parasitic light.
Working principle:
in operation, as shown in fig. 1, imaging light emitted from the display image source 1 passes through the first fresnel lens unit 2, and is transmitted to the first prism to be emitted on a right-angle optical surface close to the second fresnel lens unit 4. The optical surface (namely the inclined optical surface) of one side of the first prism, which is close to the human eye 5, is provided with a semi-transparent semi-reflective film, imaging light rays are emitted again and returned to the second Fresnel lens unit 4, the right-angle optical surface of the second Fresnel lens unit 4, which is close to the first prism, is also provided with the semi-transparent semi-reflective film, the imaging light rays are reflected for the third time and enter the human eye 5 to image through the first prism, and meanwhile, real scene light rays enter the human eye to image through the second Fresnel lens unit 4 and the imaging prism unit 3 in sequence, so that fusion of virtual information and real world information is realized.
In the prior art, the near-to-eye display device is used for viewing the external environment clearly, and a compensation lens is needed, so that the whole optical system is equal in thickness and cannot deform when being viewed from the external environment. According to the optical system, the Fresnel lens is adopted to replace a traditional compensation lens (such as a curved lens or a prism), the thickness of the curved lens or the prism is reduced, the purpose of thinning is achieved, and the thickness of the whole optical system is further reduced while the increase of the angle of view is facilitated on the basis of the same optical path by increasing the folding times of the optical path. It is easy to understand that the imaging prism, the curved lens and the compensating lens in other near-eye display devices in the prior art can be partially or completely optimized as fresnel lenses according to actual requirements.
Example 2:
as shown in fig. 2, an ultra-thin enhanced realistic near-eye display device includes a display image source 1, an imaging prism unit 3, and a second fresnel lens unit 4, wherein:
a display image source 1 for emitting imaging light to an imaging prism unit 3;
an imaging prism unit 3, wherein a first transflective film is arranged on one side close to the human eye 5, and the imaging prism unit 3 is used for reflecting imaging light rays to a second Fresnel lens unit 4;
the second Fresnel lens unit 4 is further provided with a second semi-transparent and semi-reflective film between the second Fresnel lens unit 4 and the imaging prism unit 3, and the second Fresnel lens unit 4 is matched with the adjacent surface shape of the imaging prism unit 3, and the second semi-transparent and semi-reflective film is used for reflecting imaging light rays to enter the human eyes 5 for imaging through the imaging prism unit 3 and transmitting real scene light rays to enter the human eyes for imaging through the imaging prism unit 3.
The near-eye display device comprises a display image source 1, an imaging prism unit 3 and a second Fresnel lens unit 4, wherein the display image source 1 is used for providing an image picture, the imaging prism unit 3 can be composed of at least one prism, the prism can be of any shape, a first semi-transparent and semi-reflective film is arranged on one side, close to a human eye 5, of the imaging prism unit 3, each optical surface of the prism can be a plane, a curved surface or a free combination of the two, the prism can be made of plastic materials or glass materials, and the first semi-transparent and semi-reflective film can be attached to the prism or plated on the prism. A second semi-transparent and semi-reflective film is arranged between the second Fresnel lens unit 4 and the imaging prism unit 3, and the second semi-transparent and semi-reflective film can be realized in a film coating mode or a film pasting mode.
The second fresnel lens unit 4 is used instead of the compensation lens in the prior art near-eye display device, such as a lens of optical power, or a prism of no optical power. The near-eye display device is optimized by utilizing the characteristics of light weight, light weight and low cost of the Fresnel lens, and the thickness of the whole optical system is further reduced while the angle of view is increased by increasing the number of times of folding the optical path.
In one embodiment, the imaging prism unit 3 includes a second prism, and each optical surface of the second prism is a plane or a free-form surface.
It is easily understood that each optical surface of the prism of the imaging prism unit 3 may be at least one of a plane surface and a free-form surface, such as all of a plane surface or a free-form combination of a plane surface and a free-form surface. And the imaging prism unit 3 may be a combination of other fresnel lens units and a triangular prism, for example, an optical surface on the triangular prism close to the display image source 1 is a plane, and other surfaces are free-form surfaces, and the fresnel lens unit located between the triangular prism and the display image source 1 may be a flat fresnel lens, and the second fresnel lens unit 4 is a fresnel lens with a free-form surface structure matching an adjacent surface on the imaging prism unit 3.
In an embodiment, the second transflective film is attached to the imaging prism unit 3 or the second fresnel lens unit 4.
In one embodiment, the display image source 1 is one of an OLED display, an LCOS display, a micro-led display, an LBS display, and a DLP display. Preferably an OLED display.
In one embodiment, each fresnel lens unit includes at least one fresnel lens.
The first fresnel lens unit 2 is a series of fresnel lenses with aberration correction function, the second fresnel lens unit 4 is a series of fresnel lenses with aberration correction and optical path reflection function, and the number of fresnel lenses in each fresnel lens unit is not limited, for example, a single fresnel lens. The fresnel lenses may be made of glass or plastic.
In one embodiment, the Fresnel surface of the Fresnel lens has a tooth width of 0.1mm to 0.5mm, a tooth depth of 0.2mm to 0.5mm, and a chamfer radius of less than 0.3mm.
In an embodiment, the fresnel surface of each fresnel lens faces away from the side of the imaging prism unit 3.
The fresnel lens comprises a series of concentric annular structures, and also can be a series of linear structures, for example, each structure comprises a series of prisms, and the angles and positions of the prism faces can be determined according to practical requirements. The tooth width, tooth depth and chamfer of fresnel lenses are the main factors affecting the optical performance.
The range of the tooth width of the Fresnel lens is 0.1 mm-0.5 mm, and the range of the tooth depth is 0.2 mm-0.5 mm. Too large a tooth width or depth can result in a shortened focal length of the lens, affect the imaging quality of the lens, and cause imaging blur or distortion. Too little tooth width or depth may result in reduced transmissivity, increased astigmatism, etc. In addition, the difficulty and cost of manufacturing the lens are increased. The chamfer radius is less than 0.3mm, and small chamfers can reduce the risk of parasitic light.
Working principle:
as shown in fig. 2, the three optical surfaces of the second prism are free curved surfaces, and the imaging light emitted from the display image source 1 is transmitted to the second prism, and is emitted on the optical surface of the second prism near the second fresnel lens unit 4. The optical surface of the second prism, which is close to the human eye 5, is provided with a semi-transparent semi-reflective film, imaging light rays are emitted again and returned to the second Fresnel lens unit 4, the optical surface of the second Fresnel lens unit 4, which is close to the second prism, is also provided with the semi-transparent semi-reflective film, the imaging light rays are reflected for the third time and enter the human eye 5 to image through the second prism, and meanwhile, real scene light rays enter the human eye to image through the second Fresnel lens unit 4 and the imaging prism unit 3 in sequence, so that fusion of virtual information and real world information is realized.
In the prior art, the near-to-eye display device is used for viewing the external environment clearly, and a compensation lens is needed, so that the whole optical system is equal in thickness and cannot deform when being viewed from the external environment. According to the optical system, the Fresnel lens is adopted to replace a traditional compensation lens (such as a curved lens or a prism), the thickness of the curved lens or the prism is reduced, the purpose of thinning is achieved, and the thickness of the whole optical system is further reduced while the increase of the angle of view is facilitated on the basis of the same optical path by increasing the folding times of the optical path. It is easy to understand that the imaging prism, the curved lens and the compensating lens in other near-eye display devices in the prior art can be partially or completely optimized as fresnel lenses according to actual requirements.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above-described embodiments are merely representative of the more specific and detailed embodiments described herein and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. An ultra-thin enhanced realistic near-to-eye display device, characterized in that: the ultra-thin enhanced realistic near-to-eye display device comprises a display image source (1), an imaging prism unit (3) and a second fresnel lens unit (4), wherein:
the display image source (1) is used for emitting imaging light rays to the imaging prism unit (3);
the imaging prism unit (3) is provided with a first semi-transparent semi-reflective film at one side close to the human eye (5), and the imaging prism unit (3) is used for reflecting imaging light rays to the second Fresnel lens unit (4);
the second Fresnel lens unit (4) is further provided with a second semi-transparent semi-reflective film between the second Fresnel lens unit and the imaging prism unit (3), the shape of the second Fresnel lens unit (4) is matched with that of the adjacent surface of the imaging prism unit (3), and the second semi-transparent semi-reflective film is used for reflecting imaging light rays, then entering human eyes (5) through the imaging prism unit (3) for imaging, and is used for transmitting real scene light rays, then entering the human eyes through the imaging prism unit (3) for imaging.
2. The ultra-thin enhanced realistic near-to-eye display device of claim 1, wherein: the imaging prism unit (3) comprises a first Fresnel lens unit (2) and a first prism, wherein the first Fresnel lens unit (2) is positioned between the display image source (1) and the first prism, and each optical surface of the first prism is a plane or a free-form surface.
3. The ultra-thin enhanced realistic near-to-eye display device of claim 2, wherein: the focal length f of the first Fresnel lens unit (2) is in a value range of: f is less than or equal to-30 mm or f is more than or equal to 30mm.
4. The ultra-thin enhanced realistic near-to-eye display device of claim 2, wherein: the first triangular prism is a right-angle triangular prism, the two right-angle optical surfaces are respectively close to the first Fresnel lens unit (2) and the second Fresnel lens unit (4), and the inclined optical surfaces are close to human eyes.
5. The ultra-thin enhanced realistic near-to-eye display device of claim 1, wherein: the imaging prism unit (3) comprises a second prism, and each optical surface of the second prism is a plane or a free curved surface.
6. The ultra-thin enhanced realistic near-to-eye display device of claim 1, wherein: the second semi-transparent and semi-reflective film is attached to the imaging prism unit (3) or the second Fresnel lens unit (4).
7. The ultra-thin enhanced realistic near-to-eye display device of claim 1, wherein: the display image source (1) is one of an OLED display, an LCOS display, a micro display, an LBS display and a DLP display.
8. The ultra-thin enhanced realistic near-to-eye display device of any one of claims 1-7, wherein: each fresnel lens unit includes at least one fresnel lens.
9. The ultra-thin enhanced realistic near-to-eye display device of claim 8, wherein: the tooth width of the Fresnel surface of the Fresnel lens is 0.1 mm-0.5 mm, the tooth depth is 0.2 mm-0.5 mm, and the chamfer radius is smaller than 0.3mm.
10. The ultra-thin enhanced realistic near-to-eye display device of claim 8, wherein: the fresnel surface of each fresnel lens faces away from the side of the imaging prism unit (3).
CN202322152975.3U 2023-08-10 2023-08-10 Ultrathin enhanced realistic near-to-eye display device Active CN220208006U (en)

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