CN110873967A - Near-to-eye display optical system and head-mounted display - Google Patents
Near-to-eye display optical system and head-mounted display Download PDFInfo
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- CN110873967A CN110873967A CN201911194926.8A CN201911194926A CN110873967A CN 110873967 A CN110873967 A CN 110873967A CN 201911194926 A CN201911194926 A CN 201911194926A CN 110873967 A CN110873967 A CN 110873967A
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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
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
Abstract
The application is suitable for the technical field of display, and provides a near-to-eye display optical system and a head-mounted display. Embodiments of the present application provide a near-to-eye display optical system including a display device, a first aspheric lens, a second aspheric lens, a third aspheric lens, a flat plate beam splitter and a concave mirror, the first aspheric lens, the second aspheric lens, the third aspheric lens and the flat-plate type spectroscope are sequentially arranged along the light emergent direction of the display device, the main optical axes of the first aspheric lens, the second aspheric lens and the third aspheric lens are overlapped, the reflecting surface of the concave reflecting mirror faces the light splitting surface of the flat-plate type spectroscope, the included angle between the light splitting surface and the focal planes of the main optical axis and the concave reflecting mirror is larger than 0 degree and smaller than 90 degrees, the included angle between the focal plane and the main optical axis is larger than or equal to 0 degree and smaller than 90 degrees, the processing, detection and assembly technology is mature, the production difficulty is small, and the manufacturing cost is low.
Description
Technical Field
The application belongs to the technical field of display, and particularly relates to a near-to-eye display optical system and a head-mounted display.
Background
With the continuous development of Display technologies, various Head Mounted Displays (HMDs) are developed, which can achieve Display effects of Virtual Reality (VR), Augmented Reality (AR), Mixed Reality (MR), and the like, and bring brand new visual enjoyment to people. The optical system is the most critical component of the head-mounted display, and the performance of the optical system will affect the size, quality, resolution, etc. of the image observed by the user.
The existing head-mounted display generally adopts an optical system of an off-axis turn-back structure based on a free-form surface, the processing, detection and assembly technology of the free-form surface is not mature enough at present, the production difficulty is high, the manufacturing cost is high, and the off-axis turn-back structure has high requirements on assembly and is not beneficial to actual processing and production.
Content of application
In view of this, embodiments of the present application provide a near-to-eye display optical system and a head mounted display, so as to solve the problems that the existing head mounted display generally adopts an optical system based on an off-axis foldback structure with a free-form surface, the processing, detection and assembly technologies of the free-form surface are not mature enough at present, the production difficulty is high, the manufacturing cost is high, and the off-axis foldback structure has a high requirement on assembly, which is not favorable for actual processing and production.
The embodiment of the application provides a near-to-eye display optical system, which comprises a display device, a first aspheric lens, a second aspheric lens, a third aspheric lens, a flat-plate type spectroscope and a concave reflector;
the first aspheric lens, the second aspheric lens, the third aspheric lens and the flat-plate type spectroscope are sequentially arranged along a light ray emergent direction of the display device, main optical axes of the first aspheric lens, the second aspheric lens and the third aspheric lens are overlapped, a reflecting surface of the concave reflector faces a splitting surface of the flat-plate type spectroscope, an included angle between the splitting surface and a focal plane of the main optical axis and the concave reflector is larger than 0 degree and smaller than 90 degrees, and an included angle between the focal plane and the main optical axis is larger than or equal to 0 degree and smaller than 90 degrees;
the light rays emitted by the display device are reflected by the light splitting surface and then incident to the reflecting surface, are converged and incident to the light splitting surface after being reflected by the reflecting surface, and are refracted by the light splitting surface and then emergent from the exit pupil position opposite to the reflecting surface.
In one embodiment, two surfaces of the first aspheric lens, the second aspheric lens, and the third aspheric lens and the reflective surface are even aspheric surfaces.
In one embodiment, focal lengths of the first aspheric lens, the second aspheric lens, the third aspheric lens, and the reflective surface satisfy the following condition:
-0.2<f1/f<-0.05；
0.01<f2/f<0.1；
-5<f3/f<-1；
1<f4/f<3；
wherein f is a focal length of the near-eye display optical system, f1 is a focal length of the first aspheric lens, f2 is the second aspheric lens, f3 is the third aspheric lens, and f4 is a focal length of the reflecting surface.
In one embodiment, the radii of curvature of both surfaces of the first aspherical lens, the second aspherical lens, and the third aspherical lens satisfy the following condition:
0.4<(r1+r2)/(r1-r2)<0.9；
-2<(r3+r4)/(r3-r4)<-0.5；
-5<(r5+r6)/(r5-r6)<-1；
wherein r1 and r2 are radii of curvature of both surfaces of the first aspheric lens, r3 and r4 are radii of curvature of both surfaces of the second aspheric lens, and r5 and r6 are radii of curvature of both surfaces of the third aspheric lens, respectively.
In one embodiment, the included angles between the beam splitting plane and the main optical axis and the focal plane are both 45 °, and the included angle between the focal plane and the main optical axis is equal to 0 °.
In one embodiment, the rear surface of the third aspheric lens, the splitting surface, the reflecting surface, and the exit pupil position satisfy the following condition:
1.5<L1/f<2.1；
0.5<L2/f<1.2；
0.7<L3/f<1.3；
wherein L1 is the shortest distance from the exit pupil position to the beam splitting surface, L2 is the shortest distance from the beam splitting surface to the reflecting surface, and L3 is the shortest distance from the beam splitting surface to the rear surface of the third aspheric lens, which is a surface far away from the beam splitting surface.
In one embodiment, the light splitting surface is a semi-transparent semi-reflecting surface.
In one embodiment, the near-eye display optical system further comprises a light-transmissive protector disposed between the display device and the first aspheric lens; and
and the field diaphragm is arranged at the exit pupil position.
In one embodiment, the first aspheric lens, the second aspheric lens, the third aspheric lens and the flat-plate type beam splitter are all plastic lenses.
The embodiment of the application also provides a head-mounted display, which comprises the near-eye display optical system.
Embodiments of the present application provide a near-to-eye display optical system including a display device, a first aspheric lens, a second aspheric lens, a third aspheric lens, a flat plate beam splitter and a concave mirror, the first aspheric lens, the second aspheric lens, the third aspheric lens and the flat-plate type spectroscope are sequentially arranged along the light emergent direction of the display device, the main optical axes of the first aspheric lens, the second aspheric lens and the third aspheric lens are overlapped, the reflecting surface of the concave reflecting mirror faces the light splitting surface of the flat-plate type spectroscope, the included angle between the light splitting surface and the focal planes of the main optical axis and the concave reflecting mirror is larger than 0 degree and smaller than 90 degrees, the included angle between the focal plane and the main optical axis is larger than or equal to 0 degree and smaller than 90 degrees, the processing, detection and assembly technology is mature, the production difficulty is small, and the manufacturing cost is low.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a near-eye display optical system provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a modulation transfer function of a near-eye display optical system based on table one and table two provided in an embodiment of the present application;
fig. 3 is a distortion curve of a near-eye display optical system based on table one and table two provided by an embodiment of the present application;
fig. 4 is a chromatic aberration curve of a near-eye display optical system based on table one and table two provided by an embodiment of the present application;
FIG. 5 is a dot-column diagram of a near-eye display optical system based on Table one and Table two provided by an embodiment of the present application;
fig. 6 is a schematic diagram of a modulation transfer function of a near-eye display optical system based on table three and table four provided in an embodiment of the present application;
fig. 7 is a distortion curve of a near-eye display optical system based on table three and table four provided by an embodiment of the present application;
fig. 8 is a chromatic aberration curve of a near-eye display optical system based on table three and table four provided in an embodiment of the present application;
fig. 9 is a dot-column diagram of a near-eye display optical system based on table three and table four provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
The embodiment of the application provides a near-to-eye display optical system, which is applied to a head-mounted display capable of realizing display effects such as virtual reality, augmented reality or mixed reality. At least one of a left-eye optical system and a right-eye optical system of the head-mounted display may be realized by the near-eye display optical system.
In this embodiment, only the specific structure and the implementation principle of the near-eye display optical system are introduced, in practical application, the head-mounted display inevitably further includes a power module for supplying power, a communication module for performing information interaction with other terminals, a processor for controlling the power module, the communication module and the display device in the near-eye display optical system, a circuit board for integrally setting the structures such as the power module, the communication module, the display device and the processor, and mechanical structures such as a bracket and a housing for fixing the structures and facilitating wearing by a user, and the structure of the non-near-eye display optical system is not particularly limited in this embodiment.
As shown in fig. 1, a near-eye display optical system provided in an embodiment of the present application includes a display device 1, a first aspheric lens 2, a second aspheric lens 3, a third aspheric lens 4, a flat-type beam splitter 5, and a concave mirror 6, and the relative position relationship of the devices in the near-eye display optical system is as follows:
the first aspheric lens 2, the second aspheric lens 3, the third aspheric lens 4 and the flat-plate type spectroscope 5 are sequentially arranged along the light emergent direction of the display device 1, the main optical axes of the first aspheric lens 2, the second aspheric lens 3 and the third aspheric lens 4 coincide, the reflecting surface of the concave reflecting mirror 6 faces the light splitting surface of the flat-plate type spectroscope 5, the included angle between the light splitting surface and the focal plane of the main optical axis and the concave reflecting mirror 6 is larger than 0 degree and smaller than 90 degrees, and the included angle between the focal plane and the main optical axis is larger than or equal to 0 degree and smaller than 90 degrees.
In application, the flat-plate type spectroscope is arranged at an inclination angle which is larger than 0 degree and smaller than 90 degrees relative to the main optical axes of the three aspheric lenses and the focal plane of the concave reflector, the light splitting surface of the flat-plate type spectroscope faces the reflecting surfaces of the third aspheric lens and the concave reflector, the exit pupil positions of the third aspheric lens, the concave reflector and the near-eye display optical system are respectively arranged at three different directions of the flat-plate type spectroscope, and the reflecting surface and the exit pupil position of the concave reflector are opposite.
Fig. 1 exemplarily shows that the included angles between the splitting plane and the main optical axis and the focal plane of the concave mirror are both 45 °, and the structure of the near-eye display optical system when the included angle between the focal plane and the main optical axis is equal to 0 °.
Based on fig. 1, the working principle of the near-eye display optical system provided by the embodiment of the present application is as follows:
light emitted by the display device 1 is refracted by the first aspheric lens 2, the second aspheric lens 3 and the third aspheric lens 4 in sequence, then is diverged and incident to the splitting surface of the flat-type spectroscope 5, is reflected by the splitting surface of the flat-type spectroscope 5 and then is incident to the reflecting surface of the concave reflecting mirror 6, is converged and incident to the splitting surface of the flat-type spectroscope 5 after being reflected by the reflecting surface of the concave reflecting mirror 6, and is refracted by the splitting surface of the flat-type spectroscope 5 and then is emitted from an exit pupil position 7 opposite to the reflecting surface of the concave reflecting mirror 6.
In application, the exit pupil position is a position where an image displayed by the display device can be observed by human eyes, when the near-eye display optical system is applied to the head-mounted display device, a user wears the head-mounted display device, and light rays emitted by the display device finally exit through the exit pupil position and then enter the human eyes.
In application, the Display device may be a Liquid Crystal Display device based on LCD (Liquid Crystal Display) technology, an Organic electroluminescent Display device based on OLED (Organic electroluminescent Display) technology, a Quantum Dot Light Emitting diode Display device based on QLED (Quantum Dot Light Emitting Diodes) technology, a curved Display device, or a reflective matrix Liquid Crystal Display device based on LCOS (Liquid Crystal on Silicon) technology.
In one embodiment, two surfaces of the first aspheric lens, the second aspheric lens, and the third aspheric lens and the reflective surface are even aspheric surfaces.
In application, the expression of the aspheric equation for the even aspheric surface is as follows:
Z＝cy/[1+{1(1+k)cy}]+A4y4+A6y6+A8y8+A10y10+A12y12+A14y14+A16y16
wherein Z is aspheric sagittal height, c is aspheric paraxial curvature, y is lens caliber, k is cone coefficient, A4Is a 4-order aspheric coefficient, A6Is a 6-degree aspheric surface coefficient, A8Is an 8 th order aspheric surface coefficient, A10Is a 10 th order aspheric surface coefficient, A12Is a 12 th order aspheric surface coefficient, A14Is a 14 th order aspheric coefficient, A16Is a 16-degree aspheric coefficient.
In one embodiment, the first aspheric lens, the second aspheric lens, the third aspheric lens and the flat-plate type beam splitter are all plastic lenses.
In application, the first aspheric lens, the second aspheric lens, the third aspheric lens, the flat-plate beam splitter and the flat-plate beam splitter may be plastic lenses, and may be acrylic lenses or resin lenses.
In one embodiment, the light splitting surface is a semi-transparent semi-reflecting surface.
In application, the light splitting surface of the flat-plate spectroscope is formed by coating a film on the surface of a flat-plate plastic lens. The types of the coating films are different according to the different ratios of the transmittance and the reflectivity of the light splitting surface. The light splitting surface can be a semi-transparent semi-reflecting surface with the ratio of the transmittance to the reflectivity of 1:1, and is realized by plating a semi-transparent semi-reflecting film on the surface of the flat plastic lens.
In application, compared with a free-form surface lens, the aspheric lens or the spherical lens has the advantages of mature processing, detection and assembly processes, low technical difficulty and the like, and the plastic lens has the advantages of light weight, low cost and the like. By adopting the plastic lens, the weight and the cost of the near-to-eye display optical system can be effectively reduced, so that the weight and the cost of the head-mounted display are reduced, and the head-mounted display is convenient to wear.
In one embodiment, focal lengths of the first aspheric lens, the second aspheric lens, the third aspheric lens, and the reflective surface satisfy the following condition:
-0.2<f1/f<-0.05；
0.01<f2/f<0.1；
-5<f3/f<-1；
1<f4/f<3；
wherein f is a focal length of the near-eye display optical system, f1 is a focal length of the first aspheric lens, f2 is the second aspheric lens, f3 is the third aspheric lens, and f4 is a focal length of the reflecting surface.
In one embodiment, based on the above-described condition that the focal lengths of the first aspherical lens, the second aspherical lens, the third aspherical lens, and the reflecting surface satisfy, the radii of curvature of both surfaces of the first aspherical lens, the second aspherical lens, and the third aspherical lens satisfy the following condition:
0.4<(r1+r2)/(r1-r2)<0.9；
-2<(r3+r4)/(r3-r4)<-0.5；
-5<(r5+r6)/(r5-r6)<-1；
wherein r1 and r2 are radii of curvature of both surfaces of the first aspheric lens, r3 and r4 are radii of curvature of both surfaces of the second aspheric lens, and r5 and r6 are radii of curvature of both surfaces of the third aspheric lens, respectively.
In application, two surfaces of the first aspheric lens, the second aspheric lens and the third aspheric lens respectively comprise a front surface and a back surface, and a surface far away from the display device in the two surfaces of the first aspheric lens, the second aspheric lens and the third aspheric lens is the front surface, and a surface close to the display device is the back surface.
In one embodiment, when the included angles between the beam splitting plane and the main optical axis and the focal plane are both 45 ° and the included angle between the focal plane and the main optical axis is equal to 0 °, the rear surface of the third aspheric lens, the beam splitting plane, the reflecting plane, and the exit pupil position satisfy the following conditions:
1.5<L1/f<2.1；
0.5<L2/f<1.2；
0.7<L3/f<1.3；
wherein L1 is the shortest distance from the exit pupil position to the beam splitting surface, L2 is the shortest distance from the beam splitting surface to the reflecting surface, and L3 is the shortest distance from the beam splitting surface to the rear surface of the third aspheric lens, which is the surface far away from the beam splitting surface (i.e. the surface close to the display device).
Based on the structure of the near-eye display optical system shown in fig. 1, in one embodiment, the near-eye display optical system further includes a light-transmissive protector disposed between the display device and the first aspheric lens.
In application, the light-transmitting protective member mainly functions to protect the light exit surface of the display device. The light-transmissive protector may be a glass or plastic protector having a light transmittance equal to or infinitely close to 100%.
In one embodiment, the light transmissive protection member is a flat plate type glass protection member.
In one embodiment, the near-eye display optical system further includes a field stop disposed at the exit pupil location.
In application, a field diaphragm can be arranged at the exit pupil position to limit the field range, emergent rays are limited in the field range of human eyes, ray leakage is prevented, and the display effect is improved.
The first surface parameter of each optical structure in the near-eye display optical system is exemplarily shown in table one.
Watch 1
Based on table one, table two exemplarily shows aspheric coefficients of the surfaces in table one.
Watch two
Based on tables one and two, fig. 2 shows Modulation Transfer Functions (MTFs) of the near-eye display optical system; the ordinate of the ordinate is the Modulus (Modulus) of the Optical Transfer Function (OTF), and the abscissa is the space Frequency in cycle mm.
Based on tables one and two, fig. 3 shows distortion curves of the near-eye display optical system.
Based on tables one and two, fig. 4 shows a chromatic aberration curve of the near-eye display optical system.
Based on table one and table two, fig. 5 shows a dot diagram of the near-eye display optical system.
The second surface parameter of each optical structure in the near-eye display optical system is exemplarily shown in table three.
Watch III
Based on table three, table four exemplarily shows aspheric coefficients of respective surfaces in table three.
Watch four
| Serial number | conic | 4 | 6 | 8 | 10 | 12 | 14 | 16 |
| Serial number | ||||||||
| Diaphragm | ||||||||
| S2 | ||||||||
| S3 | ||||||||
| S4 | 9.93E-02 | -4.14E-09 | -1.49E-10 | -3.15E-13 | 1.88E-16 | 2.95E-18 | 4.20E-21 | -1.33E-23 |
| S5 | ||||||||
| S6 | 4.96E-01 | -3.13E-06 | -9.95E-08 | -7.40E-10 | -1.48E-11 | -7.92E-14 | 5.89E-17 | 7.81E-19 |
| S7 | -9.96E+39 | -1.59E-05 | -3.49E-08 | 3.26E-10 | -1.08E-12 | -4.14E-14 | -4.46E-16 | -1.52E-18 |
| S8 | -2.66E+03 | -3.03E-05 | 4.50E-07 | -3.95E-10 | -4.91E-12 | -6.30E-14 | -3.02E-16 | -1.58E-18 |
| S9 | -3.92E+39 | 3.86E-05 | -1.24E-07 | 6.48E-10 | 8.87E-12 | -6.03E-14 | -3.19E-17 | 7.00E-20 |
| S10 | -7.79E+39 | 4.63E-05 | 3.33E-07 | 1.58E-09 | 6.09E-12 | -8.66E-15 | -3.30E-16 | -4.53E-18 |
| S11 | -2.42E+39 | -1.54E-05 | -1.23E-07 | -7.97E-10 | -4.72E-12 | -3.37E-14 | -1.84E-16 | -8.02E-19 |
| S12 | ||||||||
| S13 | ||||||||
| S14 |
Based on table three and table four, fig. 6 shows Modulation Transfer Functions (MTFs) of the near-eye display optical system; the ordinate of the ordinate is the Modulus (Modulus) of the Optical Transfer Function (OTF), and the abscissa is the space Frequency in cycle mm.
Based on table three and table four, fig. 7 shows distortion curves of the near-eye display optical system.
Based on table three and table four, fig. 8 shows a chromatic aberration curve of the near-eye display optical system.
Based on table three and table four, fig. 9 shows a dot diagram of the near-eye display optical system.
As can be seen from fig. 2 to 9, based on the first surface parameter of each optical structure in table one and table two, or the first surface parameter of each optical structure in table three and table four, the near-eye display optical system provided in the embodiment of the present application can achieve a field angle (FOV) of 48 ° × 28 °, a modulation transfer function of better than 0.4 at 60lp/mm, a distortion of less than 2%, an exit pupil distance (eyeRelief) of greater than 28mm, an eye movement range (eyebox) of 12mm × 8mm, a TV distortion of less than 1%, and a chromatic aberration of less than 3.2um, and has excellent optical performance.
Embodiments of the present application provide a near-to-eye display optical system including a display device, a first aspheric lens, a second aspheric lens, a third aspheric lens, a flat plate beam splitter and a concave mirror, the first aspheric lens, the second aspheric lens, the third aspheric lens and the flat-plate type spectroscope are sequentially arranged along the light emergent direction of the display device, the main optical axes of the first aspheric lens, the second aspheric lens and the third aspheric lens are overlapped, the reflecting surface of the concave reflecting mirror faces the light splitting surface of the flat-plate type spectroscope, the included angle between the light splitting surface and the focal planes of the main optical axis and the concave reflecting mirror is larger than 0 degree and smaller than 90 degrees, the included angle between the focal plane and the main optical axis is larger than or equal to 0 degree and smaller than 90 degrees, the processing, detection and assembly technology is mature, the production difficulty is small, and the manufacturing cost is low.
It should be understood that, in application, based on the structure of the near-eye display optical system provided in the embodiment of the present application, the number of the three aspheric lenses may be increased or decreased according to actual needs, or may be combined with other free-form surfaces or spherical lenses on the basis, the flat-plate type beam splitter may be replaced by a cube-type or triangular prism-type beam splitter according to actual needs, and the concave reflector may be replaced by a plano-convex spherical reflector according to actual needs.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A near-eye display optical system is characterized by comprising a display device, a first aspheric lens, a second aspheric lens, a third aspheric lens, a flat-plate spectroscope and a concave reflector;
the first aspheric lens, the second aspheric lens, the third aspheric lens and the flat-plate type spectroscope are sequentially arranged along a light ray emergent direction of the display device, main optical axes of the first aspheric lens, the second aspheric lens and the third aspheric lens are overlapped, a reflecting surface of the concave reflector faces a splitting surface of the flat-plate type spectroscope, an included angle between the splitting surface and a focal plane of the main optical axis and the concave reflector is larger than 0 degree and smaller than 90 degrees, and an included angle between the focal plane and the main optical axis is larger than or equal to 0 degree and smaller than 90 degrees;
the light rays emitted by the display device are reflected by the light splitting surface and then incident to the reflecting surface, are converged and incident to the light splitting surface after being reflected by the reflecting surface, and are refracted by the light splitting surface and then emergent from the exit pupil position opposite to the reflecting surface.
2. The near-eye display optical system of claim 1, wherein both surfaces of the first aspheric lens, the second aspheric lens, and the third aspheric lens and the reflective surface are even-order aspheric surfaces.
3. The near-eye display optical system according to claim 1, wherein focal lengths of the first aspherical lens, the second aspherical lens, the third aspherical lens, and the reflecting surface satisfy the following condition:
-0.2<f1/f<-0.05；
0.01<f2/f<0.1；
-5<f3/f<-1；
1<f4/f<3；
wherein f is a focal length of the near-eye display optical system, f1 is a focal length of the first aspheric lens, f2 is the second aspheric lens, f3 is the third aspheric lens, and f4 is a focal length of the reflecting surface.
4. The near-eye display optical system according to claim 3, wherein radii of curvature of two surfaces of the first aspherical lens, the second aspherical lens, and the third aspherical lens satisfy the following condition:
0.4<(r1+r2)/(r1-r2)<0.9；
-2<(r3+r4)/(r3-r4)<-0.5；
-5<(r5+r6)/(r5-r6)<-1；
wherein r1 and r2 are radii of curvature of both surfaces of the first aspheric lens, r3 and r4 are radii of curvature of both surfaces of the second aspheric lens, and r5 and r6 are radii of curvature of both surfaces of the third aspheric lens, respectively.
5. The near-eye display optical system according to claim 4, wherein the angle between the splitting plane and the main optical axis and the focal plane is 45 °, and the angle between the focal plane and the main optical axis is equal to 0 °.
6. The near-eye display optical system according to claim 5, wherein the rear surface of the third aspheric lens, the splitting surface, the reflecting surface, and the exit pupil position satisfy the following condition:
1.5<L1/f<2.1；
0.5<L2/f<1.2；
0.7<L3/f<1.3；
wherein L1 is the shortest distance from the exit pupil position to the beam splitting surface, L2 is the shortest distance from the beam splitting surface to the reflecting surface, and L3 is the shortest distance from the beam splitting surface to the rear surface of the third aspheric lens, which is a surface far away from the beam splitting surface.
7. The near-eye display optical system according to any one of claims 1 to 6, wherein the light splitting surface is a semi-transparent and semi-reflective surface.
8. The near-eye display optical system according to any one of claims 1 to 6, further comprising a light-transmissive protector disposed between the display device and the first aspheric lens; and
and the field diaphragm is arranged at the exit pupil position.
9. The near-eye display optical system of any one of claims 1 to 6, wherein the first aspheric lens, the second aspheric lens, the third aspheric lens, and the flat plate beam splitter are plastic lenses.
10. A head-mounted display comprising the near-eye display optical system according to any one of claims 1 to 9.
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| CN113325567A (en) * | 2021-08-02 | 2021-08-31 | 深圳纳德光学有限公司 | Reflective eyepiece optical system and head-mounted near-to-eye display device |
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| CN113341559A (en) * | 2021-08-02 | 2021-09-03 | 深圳纳德光学有限公司 | Reflective eyepiece optical system and head-mounted near-to-eye display device |
| CN113341557A (en) * | 2021-08-02 | 2021-09-03 | 深圳纳德光学有限公司 | Reflective eyepiece optical system and head-mounted near-to-eye display device |
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| US11550142B1 (en) | 2021-08-02 | 2023-01-10 | Shenzhen NED Optics Co., lTD | Reflective eyepiece optical system and head-mounted near-to-eye display device |
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Application publication date: 20200310 |