WO2021139725A1 - 近眼显示装置 - Google Patents

近眼显示装置 Download PDF

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Publication number
WO2021139725A1
WO2021139725A1 PCT/CN2021/070662 CN2021070662W WO2021139725A1 WO 2021139725 A1 WO2021139725 A1 WO 2021139725A1 CN 2021070662 W CN2021070662 W CN 2021070662W WO 2021139725 A1 WO2021139725 A1 WO 2021139725A1
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WIPO (PCT)
Prior art keywords
half mirror
display device
optical
eye display
eye
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PCT/CN2021/070662
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English (en)
French (fr)
Inventor
武玉龙
栗可
董瑞君
王晨如
韩娜
白家荣
陈丽莉
张�浩
Original Assignee
京东方科技集团股份有限公司
北京京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US17/638,084 priority Critical patent/US20220276490A1/en
Publication of WO2021139725A1 publication Critical patent/WO2021139725A1/zh

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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
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1066—Beam splitting or combining systems for enhancing image performance, like resolution, pixel numbers, dual magnifications or dynamic range, by tiling, slicing or overlapping fields of view
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/011—Head-up displays characterised by optical features comprising device for correcting geometrical aberrations, distortion
    • 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
    • G02B27/0149—Head-up displays characterised by mechanical features
    • G02B2027/015—Head-up displays characterised by mechanical features involving arrangement aiming to get less bulky devices
    • 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
    • G02B2027/0178—Eyeglass type

Definitions

  • the present disclosure relates to the field of display technology, and more particularly to a near-eye display device.
  • near-eye display products have been initially deployed in the military field, and gradually they have been widely deployed in film, television and education. , Medical and other civil fields. Since the image source of the near-eye display product is very small, it needs to be set at a position closer to the human eye, so that the image can be clearly imaged within the observable range of the human eye. This brings greater difficulty to the design of near-eye display devices.
  • VR Virtual Reality
  • AR Augmented Reality
  • the embodiment of the present disclosure provides a near-eye display device, including:
  • the display screen is configured to display images
  • the imaging system is located on the light-emitting side of the display screen and is configured to image the display image of the display screen on the position of the human eye; wherein, the imaging system includes:
  • the flat half mirror is located on the side of the lenticular lens facing away from the display screen, and the connection line between the optical center of the flat half mirror and the optical center of the lenticular lens is the first connection line;
  • the flat half mirror is configured to receive and reflect the imaging light of the double convex lens;
  • the curved half mirror is located on the reflection light path of the flat half mirror, and the connection line between the optical center of the curved half mirror and the optical center of the flat half mirror is the second Line, the first line and the second line intersect; the curved half mirror is configured to converge the imaging light and pass through the flat half mirror toward the human eye Location reflection.
  • the display screen is located within one focal length of the imaging system.
  • the exit pupil distance of the imaging system is greater than 18 mm.
  • the distance between the optical center of the lenticular lens and the optical center of the flat half mirror is 7 mm-10 mm.
  • the distance between the optical center of the lenticular lens and the optical center of the flat half mirror is 8.7mm-8.8 mm.
  • the distance between the optical center of the flat half mirror and the optical center of the curved half mirror is 8mm-11mm.
  • the distance between the optical center of the flat half mirror and the optical center of the curved half mirror is 9.7mm-9.8mm.
  • the first connection line is perpendicular to the second connection line.
  • the two optical surfaces of the lenticular lens are spherical, odd aspheric, even aspheric or free-form surface.
  • both optical surfaces of the lenticular lens satisfy the following relationship:
  • z represents the surface equation of the optical surface
  • c represents the radius of curvature
  • k represents the quadric surface coefficient
  • r represents the semi-aperture
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , and ⁇ 5 all represent coefficients.
  • the optical surface of the lenticular lens near the display screen satisfies:
  • ⁇ 2 -1.037904547482000 ⁇ 10 -6 ;
  • ⁇ 3 -1.752251362999443 ⁇ 10 -8 ;
  • optical surface of the lenticular lens on the side facing away from the display screen satisfies:
  • ⁇ 2 -6.706673225527226 ⁇ 10 -5 ;
  • ⁇ 5 -2.562235658581397 ⁇ 10 -11 .
  • the two optical surfaces of the curved half mirror are parallel to each other; the two optical surfaces of the curved half mirror are parallel to each other;
  • the surface is spherical, odd aspheric, even aspheric or free-form surface.
  • both optical surfaces of the curved half mirror satisfy the following relationship:
  • z represents the surface equation of the optical surface
  • c represents the radius of curvature
  • k represents the quadric surface coefficient
  • r represents the semi-aperture
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , and ⁇ 5 all represent coefficients.
  • the optical surface of the curved half mirror satisfies:
  • ⁇ 2 -4.991846957838716 ⁇ 10 -6 ;
  • ⁇ 3 2.130618444391338 ⁇ 10 -8 ;
  • ⁇ 4 -1.601068438007377 ⁇ 10 -10 ;
  • the surfaces of the flat half mirror and the curved half mirror are provided with an optical film, and the optical film is The ratio of light transmission to light reflection is 4:6 to 5:5.
  • the near-eye display device is glasses or a helmet
  • the curved half mirror is reused as the lens of the glasses or helmet.
  • FIG. 1 is a schematic structural diagram of a near-eye display device provided by an embodiment of the disclosure
  • FIG. 2 is a field curvature diagram of a near-eye display device provided by an embodiment of the disclosure
  • FIG. 3 is a distortion diagram of the near-eye display device provided by an embodiment of the disclosure.
  • FIG. 5 is a graph of optical transfer function of a near-eye display device provided by an embodiment of the disclosure.
  • FIG. 6 is a schematic diagram of the appearance of a near-eye display device provided by an embodiment of the disclosure.
  • the near-eye display device refers to a display device worn on the user's eyes.
  • the near-eye display device is usually presented in the form of glasses or a helmet.
  • Near-eye display devices can provide users with AR and VR experiences.
  • the AR near-eye display technology is to superimpose and display the virtual image generated by the near-eye display device with the real-world image of the real world, so that the user can see the final enhanced real-scene image on the screen.
  • VR near-eye display technology is to display the images of the left and right eyes on the near-eye displays corresponding to the left and right eyes, respectively, and the left and right eyes can synthesize stereo vision in the brain after obtaining the image information with differences.
  • the current near-eye display device still has the problems of large volume, heavy weight, and poor imaging quality.
  • the embodiments of the present disclosure provide a near-eye display device to reduce the weight of the whole machine and improve the imaging quality.
  • FIG. 1 is a schematic structural diagram of a near-eye display device provided by an embodiment of the present disclosure. As shown in FIG. 1, the near-eye display device provided by an embodiment of the present disclosure includes:
  • the display screen 100 is configured to display images.
  • the display screen 100 serves as an image source and is configured to display images.
  • the display screen 100 may be a liquid crystal display screen or an organic light emitting diode display screen, which is not limited herein.
  • the size of the display screen 100 in the near-eye display device is usually small, and is installed in the near-eye display device. In specific implementation, a higher resolution display screen can be used, which can provide a more delicate display image.
  • the imaging system 200 is located on the light-emitting side of the display screen 100 and is configured to image the display image of the display screen 100 at the position s where the human eye is located.
  • the imaging system 200 which is indispensable in the near-eye display device, is located on the light-emitting side of the display screen 100, and is configured to image the display image of the display screen 100 at the position of the human eye.
  • the near-eye display device may include two display screens 100 and two imaging systems 200, corresponding to the left eye and the right eye, respectively.
  • the images displayed on the display screens corresponding to the left eye and the right eye may have some information differences, so that after the left eye and the right eye receive the corresponding images, the images can be synthesized in the brain to produce a stereoscopic visual effect.
  • the imaging system 200 includes:
  • the biconvex lens 21 is located on the light emitting side of the display screen 100;
  • the flat half mirror 22 is located on the side of the lenticular lens 21 away from the display screen 100;
  • the curved half mirror 23 is located on the reflection light path of the flat half mirror 22.
  • the line connecting the optical center of the lenticular lens 21 and the optical center of the flat half mirror 22 is the first line 01, the optical center of the flat half mirror 22 and the optical center of the curved half mirror 23
  • the connection of is the second connection 02, and the first connection 01 and the second connection 02 intersect.
  • the light emitted from the display screen 100 first enters the lenticular lens 21.
  • the lenticular lens 21 is configured to magnify the displayed image. After the light passes through the lenticular lens 21, it enters the flat half mirror 22, and the flat half mirror 22 The light is reflected to the curved half mirror 23, and then through the reflection of the curved half mirror 23, the light is reflected and converged to the side of the flat half mirror 22, and finally passes through the flat half mirror.
  • the mirror 23 is incident on the position s where the human eye is.
  • the flat half mirror 22 and the curved half mirror 23 have the function of turning back light, so that the light path can be increased by reflection, without the need to design the near-eye display device according to the length of the optical path, which is conducive to reducing the near-eye Display the overall volume of the device.
  • the imaging system 200 uses a double convex lens 21 and a curved half mirror 23, so that the three curved surfaces can be optimized to improve the imaging quality of the imaging system, avoid introducing more imaging devices for optimizing parameters, and reduce the overall
  • the number of lenses used is to simplify the structure of the imaging system and reduce the overall weight of the near-eye display device.
  • the display screen 100 may be placed within one focal length of the imaging system 200.
  • the size of the display screen 100 is small, and when a small size display screen is used to display rich image details, it cannot be directly observed by the human eye. Therefore, the display screen 100 can be placed within one focal length of the imaging system 200, so that the imaging system can form an upright magnified virtual image, magnify the display image of the display screen 100, so that the human eyes can see the details in the displayed image.
  • the distance of the imaging position can also be affected.
  • the imaging position can be adjusted by adjusting the distance between the display screen 100 and the imaging system 200 to find the best imaging position.
  • the distance between the imaging position s and the optical center of the flat half mirror 22 is the exit pupil distance of the imaging system 200.
  • the distance of the imaging system 200 The exit pupil distance is greater than 18mm, which can prevent the human eyes from being too close to the near-eye display device, which is more convenient for the audience to wear, and the design is optimized.
  • the first connection line between the optical center of the lenticular lens 21 and the optical center of the flat half mirror 22 is perpendicular to the flat half mirror.
  • the distance between the optical center of the lenticular lens 21 and the optical center of the flat half mirror 22 refers to the center point of the optical surface of the lenticular lens 21 facing away from the display screen 100 and the flat half mirror.
  • the distance between the optical center of the lenticular lens 21 and the optical center of the flat half mirror 22 is 7mm-10mm. When the value is 8.7mm-8.8mm, the imaging effect is Better.
  • the distance between the optical center of the flat half mirror 22 and the optical center of the curved half mirror 23 means: the flat half mirror 22 faces the curved half mirror 23 one The distance between the center point of the optical surface on the side and the center point of the optical surface on the side of the curved half mirror 23 facing the flat half mirror 22.
  • the distance between the optical center of the flat half mirror 22 and the optical center of the curved half mirror 23 is 8mm-11mm, when the value is 9.7mm-9.8 When mm, the imaging effect is better.
  • each lens in the imaging system and the distance between each lens will affect the imaging quality.
  • the embodiments of the present disclosure take into account the field curvature, distortion and optical transfer function and other factors to determine the distance between the optical components. And the surface shape of each optical component.
  • the two optical surfaces of the lenticular lens 21 can be designed as any one of odd aspheric surfaces, even aspheric surfaces or free-form surfaces. Compared with spherical lenses, aspheric lenses have more comprehensive parameters that can be optimized, so they have better imaging quality.
  • the odd-order aspheric surface is an asymmetric aspheric surface
  • the even-order aspheric surface is a symmetric aspheric surface.
  • the two optical surfaces of the lenticular lens 21 may be designed as even-order aspheric surfaces in the embodiment of the present disclosure.
  • both optical surfaces of the lenticular lens 21 can satisfy the following relationship:
  • z represents the surface equation of the optical surface
  • c represents the radius of curvature
  • k represents the quadric surface coefficient
  • r represents the semi-aperture
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , and ⁇ 5 all represent coefficients.
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , and ⁇ 5 are the coefficients of higher-order terms. The more the number of higher-order terms, the finer the design. When designing, the imaging quality of the lenticular lens can be optimized by increasing the number of higher-order terms.
  • the values of each parameter are as follows:
  • ⁇ 2 -1.037904547482000 ⁇ 10 -6 ;
  • ⁇ 3 -1.752251362999443 ⁇ 10 -8 ;
  • ⁇ 5 -4.351559618685465 ⁇ 10 -13 .
  • the values of each parameter are as follows:
  • ⁇ 2 -6.706673225527226 ⁇ 10 -5 ;
  • ⁇ 5 -2.562235658581397 ⁇ 10 -11 .
  • the two optical surfaces of the curved half mirror 23 can be designed as any one of odd-order aspheric surfaces, even-order aspheric surfaces, or free-form surfaces. Compared with spherical lenses, aspheric lenses have more comprehensive parameters that can be optimized, so they have better imaging quality.
  • the odd-order aspheric surface is an asymmetrical aspheric surface
  • the even-order aspheric surface is a symmetrical aspheric surface.
  • the two optical surfaces of the curved half mirror 23 can be designed as even-order aspherical surfaces in the embodiment of the present disclosure.
  • both optical surfaces of the curved half mirror 23 can satisfy the following relationship:
  • z represents the surface equation of the optical surface
  • c represents the radius of curvature
  • k represents the quadric surface coefficient
  • r represents the semi-aperture
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , and ⁇ 5 all represent coefficients.
  • ⁇ 1 , ⁇ 2 , ⁇ 3 , ⁇ 4 , and ⁇ 5 are the coefficients of higher-order terms. The more the number of higher-order terms, the finer the design. When designing, the imaging quality of the curved half mirror can be optimized by increasing the number of higher-order terms.
  • ⁇ 2 -4.991846957838716 ⁇ 10 -6 ;
  • ⁇ 3 2.130618444391338 ⁇ 10 -8 ;
  • ⁇ 4 -1.601068438007377 ⁇ 10 -10 ;
  • the parameter values of the optical surfaces of the lenticular lens 21 and the curved half mirror 23 can be optimized according to the final performance of the imaging system in terms of field curvature, distortion, and optical transfer function.
  • the lenticular lens 21 and the curved half mirror 23 The surface shape and the distance between the optical components will affect the imaging quality of the imaging system, and many factors need to be considered comprehensively when the optical design is carried out.
  • the biconvex lens 21 and the curved half mirror 23 can also be odd-order aspherical or free-form surfaces.
  • the embodiments of the present disclosure only take the implementation of even-order aspherical surfaces for illustration, and do not use the biconvex lens 21. And the specific surface shape of the curved half mirror 23 is restricted. When the lenticular lens 21 and the curved half mirror 23 use other types of surface shapes, the corresponding parameters should be reset.
  • the embodiments of the present disclosure also provide the imaging performance of the imaging system 200 in terms of field curvature, distortion, and optical transfer function when the optical components in the imaging system meet the above-mentioned conditions.
  • FIG. 2 is a field curvature diagram of a near-eye display device provided by an embodiment of the disclosure, wherein the abscissa represents the field curvature, and the ordinate represents the height of the field of view. The closer to 0 the curvature of field of the imaging system at each height of the field of view, the better the imaging effect.
  • the field curvature diagram shows the field curvature in the sagittal direction and the meridian direction.
  • the dashed line represents the field curvature in the sagittal direction
  • the solid line represents the field curvature in the meridian direction
  • different gray levels represent the field curvature of light of different wavelengths. the amount.
  • the imaging system 200 provided by the embodiment of the present disclosure controls the field curvature within ⁇ 0.1 after parameter optimization, the field curvature is small, and the imaging effect is good.
  • Fig. 3 is a distortion diagram of the near-eye display device provided by an embodiment of the disclosure, where the abscissa represents the amount of distortion, and the ordinate represents the height of the field of view. The closer to 0 the curvature of field of the imaging system at each height of the field of view, the better the imaging effect. Different gray scales in the distortion map represent the amount of distortion of light of different wavelengths. As shown in FIG. 3, the imaging system 200 provided by the embodiment of the present disclosure has a distortion amount of less than 2% after parameter optimization, the distortion amount is small, and the imaging effect is good.
  • FIG. 4 is a grid distortion diagram of the near-eye display device provided by an embodiment of the disclosure, where " ⁇ " represents a real imaging point, and " ⁇ " represents an ideal imaging point. It can be seen from FIG. 3 that after parameter optimization of the imaging system 200 provided by the embodiment of the present disclosure, the position difference between the real imaging point and the ideal imaging point is small, the network distortion is less than 1.4%, the distortion is small, and the imaging effect is good.
  • FIG. 5 is a graph of the optical transfer function of the near-eye display device provided by an embodiment of the present disclosure, where the abscissa represents the spatial frequency, the ordinate represents the modulation transfer function (Modulation Transfer Function, referred to as MTF) value, and the MTF value reflects the value of the optical system Important parameters.
  • MTF Modulation Transfer Function
  • the uppermost curve in Figure 5 represents the diffraction limit when the field of view is 0. The closer the MTF value at different field angles is to the uppermost curve, the better the imaging effect of the imaging system.
  • the optical transfer function graph shows the MTF curve in the sagittal direction and the meridian direction, where the dotted line represents the MTF curve in the sagittal direction, the solid line represents the MTF curve in the meridian direction, and different gray levels represent the MTF curves of light of different wavelengths.
  • the optical transfer function of the full field of view is greater than 0.3 at 31 lp/mm, and the optical transfer function of the full field of view is greater than 62 lp/mm. 0.1, with better imaging performance.
  • the lenticular lens 21, the flat half mirror 22, and the curved half mirror 23 can all be made of optical glass, resin, plastic and other materials, which are not limited here.
  • the surfaces of the flat half mirror 22 and the curved half mirror 23 are provided with an optical film, and the ratio of light transmission to light reflection of the optical film is 4:6-5:5.
  • the optical film in the embodiments of the present disclosure utilizes the principle of film interference, and adjusts the number of layers of the optical film, the refractive index and the thickness of the material and other parameters to make it have a transmission or reflection effect. Adjusting the above parameters can also control the ratio of light transmission and light reflection of the optical film.
  • the reflected light of the flat half mirror 22 is used for imaging, but the reflected light of the curved half mirror 23 finally passes through the flat half mirror 22 before it enters the human eye, so the plane is half transparent.
  • the transmittance of the half mirror 22 is equivalent to the reflectance, and neither the reflected light nor the transmitted light is excessively lost.
  • the reflectivity of the curved half mirror 23 can be increased to allow more light to be used for imaging; when used in the AR field, the ambient light needs to pass through the curved half mirror 23 participates in the synthesis of images, at this time, the transmittance and reflectance of the curved half mirror 23 need to be set reasonably.
  • the ratio of light transmission to light reflection of the optical film on the surface of the flat half mirror 22 and the curved half mirror 23 can be controlled within the range of 4:6 to 5:5, which has a good Imaging effect.
  • the above-mentioned near-eye display device provided by the embodiments of the present disclosure may be glasses or a helmet.
  • the curved half mirror 23 can be reused as glasses or helmet lenses, thereby reducing the number of lenses used by the near-eye display device.
  • the near-eye display device is glasses, its appearance can be seen in FIG. 6.
  • the left spectacle lens can be provided with a set of imaging system and display screen
  • the right spectacle lens can be provided with another set of imaging system and display screen.
  • the near-eye display device includes: a display screen configured to display an image; an imaging system, located on the light emitting side of the display screen, configured to image the display image of the display screen at the position of the human eye; wherein, The imaging system includes: a double convex lens located on the light emitting side of the display screen; a flat half mirror located on the side of the double convex lens facing away from the display screen; a curved half mirror located on the reflection light path of the flat half mirror; The line connecting the optical center of the lenticular lens and the optical center of the flat half mirror intersects the line connecting the optical center of the flat half mirror and the optical center of the curved half mirror; the lenticular lens is configured to display The display image of the screen is magnified.
  • the flat half mirror is configured to receive the imaging light of the double convex lens and reflect it to the curved half mirror, and the curved half mirror is configured to converge the imaging light toward the human eye. Location reflection.
  • Planar half mirrors and curved half mirrors have the function of turning back light, so that the light path can be increased by reflection, without the need to design the near-eye display device according to the length of the optical path, which is beneficial to reduce the near-eye display device The overall volume.
  • the imaging system uses a double convex lens and a curved half mirror, so that the three curved surfaces can be optimized to improve the imaging quality of the imaging system, avoid introducing more imaging devices to optimize parameters, and reduce the use of lenses as a whole To simplify the structure of the imaging system and reduce the overall weight of the near-eye display device.

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Abstract

一种近眼显示装置，包括显示屏（100）和成像系统（200），成像系统（200）包括：双凸透镜（21）、平面半透半反镜（22）和曲面半透半反镜（23），双凸透镜（21）被配置为将显示屏（100）的显示图像放大，平面半透半反镜（22）被配置为接收双凸透镜（21）的成像光线并向曲面半透半反镜（23）反射，曲面半透半反镜（23）被配置为将成像光线会聚并向人眼所在的位置（s）反射。平面半透半反镜（22）与曲面半透半反镜（23）具有对光线进行折返的作用，有利于缩小近眼显示装置的整体体积。成像系统（200）中采用双凸透镜（21）和曲面半透半反镜（23），可以对三个曲面进行优化，以提高成像系统（200）的成像质量，避免为了优化参数而引入更多的成像器件，从整体上减少透镜的使用数量，以简化成像系统（200）的结构，减轻近眼显示装置的整体重量。

Description

近眼显示装置
相关申请的交叉引用
本公开要求在2020年01月10日提交中国专利局、申请号为202010026691.8、申请名称为“一种近眼显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及显示技术领域，尤其涉及一种近眼显示装置。
背景技术
近年来随着虚拟现实(Virtual Reality，简称VR)和增强现实(Augmented Reality，简称AR)技术的不断发展，近眼显示产品由最初应被配置为军事领域，逐渐地被广泛被配置为影视、教育、医疗等民事领域。由于近眼显示产品的图像源非常小，因此需要距离人眼较近的位置进行设置，才能够使图像可以清晰地成像在人眼可观察的范围之内。这就给近眼显示设备的设计带来较大的难度。
发明内容
本公开实施例提供了一种近眼显示装置，包括：
显示屏，被配置为显示图像；
成像系统，位于所述显示屏的出光侧，被配置为将所述显示屏的显示图像成像于人眼所在的位置；其中，所述成像系统包括：
双凸透镜，位于所述显示屏的出光侧，所述双凸透镜被配置为将所述显示屏的显示图像放大；
平面半透半反镜，位于所述双凸透镜背离所述显示屏的一侧，所述平面半透半反镜的光学中心与所述双凸透镜的光学中心的连线为第一连线；所述 平面半透半反镜被配置为接收所述双凸透镜的成像光线并反射；
曲面半透半反镜，位于所述平面半透半反镜的反射光路上，所述曲面半透半反镜的光学中心与所述平面半透半反镜的光学中心的连线为第二连线，所述第一连线和所述第二连线相交；所述曲面半透半反镜被配置为将所述成像光线会聚并经过所述平面半透半反镜向人眼所在的位置反射。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述显示屏位于所述成像系统的一倍焦距之内。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述成像系统的出瞳距离大于18mm。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述双凸透镜的光学中心与所述平面半透半反镜的光学中心之间的距离为7mm-10mm。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述双凸透镜的光学中心与所述平面半透半反镜的光学中心之间的距离为8.7mm-8.8mm。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述平面半透半反镜的光学中心与所述曲面半透半反镜的光学中心之间的距离为8mm-11mm。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述平面半透半反镜的光学中心与所述曲面半透半反镜的光学中心之间的距离为9.7mm-9.8mm。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述第一连线垂直于所述第二连线。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述双凸透镜的两个光学表面为球面、奇次非球面、偶次非球面或自由曲面。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述双凸透镜的两个光学表面均满足以下关系：
Figure PCTCN2021070662-appb-000001
其中，z表示光学表面的面型方程，c表示曲率半径，k表示二次曲面系数，r表示半孔径，α 1、α 2、α 3、α 4、α 5均表示系数。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述双凸透镜靠近所述显示屏一侧的光学表面满足：
r＝-49.00863899098125mm；
k＝-95.04941082200814；
α 1＝0；
α 2＝-1.037904547482000×10 -6；
α 3＝-1.752251362999443×10 -8；
α 4＝7.636861093444737×10 -11；
α 5＝-4.351559618685465×10 -13；
所述双凸透镜背离所述显示屏一侧的光学表面满足：
r＝14.05871803442135mm；
k＝-1.367399296176254；
α 1＝0；
α 2＝-6.706673225527226×10 -5；
α 3＝8.892596162790160×10 -7；
α 4＝2.719516289317158×10 -9；
α 5＝-2.562235658581397×10 -11。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述曲面半透半反镜的两个光学表面相互平行；所述曲面半透半反镜的两个光学表面为球面、奇次非球面、偶次非球面或自由曲面。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述曲面半透半反镜的两个光学表面均满足以下关系：
Figure PCTCN2021070662-appb-000002
其中，z表示光学表面的面型方程，c表示曲率半径，k表示二次曲面系数，r表示半孔径，α 1、α 2、α 3、α 4、α 5均表示系数。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述曲面半透半反镜的光学表面满足：
r＝-52.20409394488124mm；
k＝-1.604779554699603；
α 1＝0；
α 2＝-4.991846957838716×10 -6；
α 3＝2.130618444391338×10 -8；
α 4＝-1.601068438007377×10 -10；
α 5＝3.674816411704089×10 -13。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述平面半透半镜和所述曲面半透半反镜的表面设置有光学薄膜，所述光学薄膜的光透射与光反射的比例为4:6～5:5。
在一种可能的实现方式中，在本公开实施例提供的上述近眼显示装置中，所述近眼显示装置为眼镜或头盔；
所述曲面半透半反镜复用为所述眼镜或头盔的镜片。
附图说明
图1为本公开实施例提供的近眼显示装置的结构示意图；
图2为本公开实施例提供的近眼显示装置的场曲图；
图3为本公开实施例提供的近眼显示装置的畸变图；
图4为本公开实施例提供的近眼显示装置的网格畸变图；
图5为本公开实施例提供的近眼显示装置的光学传递函数曲线图；
图6为本公开实施例提供的近眼显示装置的外观示意图。
具体实施方式
为使本公开的上述目的、特征和优点能够更为明显易懂，下面将结合附图和实施例对本公开做进一步说明。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的实施方式；相反，提供这些实施方式使得本公开更全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。在图中相同的附图标记表示相同或类似的结构，因而将省略对它们的重复描述。本公开中所描述的表达位置与方向的词，均是以附图为例进行的说明，但根据需要也可以做出改变，所做改变均包含在本公开保护范围内。本公开的附图仅被配置为示意相对位置关系不代表真实比例。
近眼显示装置是指佩戴在用户的眼部的显示设备，例如近眼显示装置通常以眼镜或头盔的形式呈现。近眼显示装置可以为用户提供AR和VR体验。其中，AR近眼显示技术是将近眼显示装置产生的虚拟图像与真实世界的实景图像叠加显示，从而使用户能够从屏幕上看到最终的增强实景图像。VR近眼显示技术是在左右眼对应的近眼显示器上分别显示左右眼的图像，左右眼分别获取带有差异的图像信息后在大脑中可以合成立体视觉。
目前的近眼显示装置还存在体积大，重量大以及成像质量不佳的问题，本公开实施例提供了一种近眼显示装置，用以减轻整机重量，提升成像质量。
图1为本公开实施例提供的近眼显示装置的结构示意图，如图1所示，本公开实施例提供的近眼显示装置，包括：
显示屏100，被配置为显示图像。
显示屏100作为图像源，被配置为显示图像。该显示屏100可以为液晶显示屏也可以为有机发光二极管显示屏，在此不做限定。近眼显示装置中的显示屏100的尺寸通常较小，安装于近眼显示装置之中，在具体实施时，可以使用较高分辨率的显示屏，可以提供画面更加细腻的显示图像。
成像系统200，位于显示屏100的出光侧，被配置为将显示屏100的显示图像成像于人眼所在的位置s。
近眼显示装置中不可或缺的成像系统200位于显示屏100的出光侧，被 配置为将显示屏100的显示图像成像于人眼所在的位置。近眼显示装置可以包括两个显示屏100和两套成像系统200，分别对应于左眼和右眼。左眼和右眼所对应的显示屏所显示的图像可以存在一些信息差异，这样在左眼和右眼接收到相应的图像之后，可以在大脑中对图像进行合成，产生立体的视觉效果。
具体地，如图1所示，成像系统200包括：
双凸透镜21，位于显示屏100的出光侧；
平面半透半反镜22，位于双凸透镜21背离显示屏100的一侧；
曲面半透半反镜23，位于平面半透半反镜22的反射光路上。
其中，双凸透镜21的光学中心与平面半透半反镜22的光学中心的连线为第一连线01，平面半透半反镜22的光学中心与曲面半透半反镜23的光学中心的连线为第二连线02，第一连线01和第二连线02相交。
显示屏100出射的光线先向双凸透镜21入射，双凸透镜21被配置为将显示图像放大，光线经过双凸透镜21的作用之后，向平面半透半反镜22入射，平面半透半反镜22将光线向曲面半透半反镜23反射，而后经过曲面半透半反镜23的反射作用，将光线再向平面半透半反镜22一侧反射并会聚，最终透过平面半透半反镜23入射到人眼所在的位置s。
平面半透半反镜22与曲面半透半反镜23具有对光线进行折返的作用，这样可以通过反射来增长光线路径，而不需要按照光路线路的长度来设计近眼显示装置，有利于缩小近眼显示装置的整体体积。
成像系统200中采用双凸透镜21和曲面半透半反镜23，这样可以对三个曲面进行优化，以提高成像系统的成像质量，避免为了优化参数而引入更多的成像器件，从整体上减少透镜的使用数量，以简化成像系统的结构，减轻近眼显示装置的整体重量。
在具体实施时，在本公开实施例提供的近眼显示装置中，显示屏100可以放置于成像系统200的一倍焦距之内。
在近眼显示装置中显示屏100的尺寸较小，而采用尺寸较小的显示屏来 显示丰富的图像细节时无法让人眼直接观察到。因此可以将显示屏100放置于成像系统200的一倍焦距之内，从而成像系统可以成正立放大的虚像，放大显示屏100的显示图像，以便人眼观看到显示图像中的细节。
通过调节显示屏100与成像系统200之间的距离还可以影响成像位置的远近。当显示屏100与成像系统200之间的距离减小时，则人眼看到的图像更远；当显示屏100与成像系统200之间的距离增大时，则要眼看到的图像更近。因此在实际应用中，可以通过调节显示屏100与成像系统200之间的距离来调节成像的位置，以寻找到最佳的成像位置。
如图1所示，成像位置s与平面半透半反镜22的光学中心之间的距离即为成像系统200的出瞳距离，在本公开实施例提供的近眼显示装置中，成像系统200的出瞳距离大于18mm，这样可以避免人眼距离近眼显示设备过近，更加方便观众的佩戴，优化设计。
在具体实施时，在本公开实施例提供的近眼显示装置中，如图1所示，双凸透镜21的光学中心与平面半透半反镜22的光学中心的第一连线垂直于平面半透半反镜22的光学中心与曲面半透半反镜23的光学中心的第二连线。以图1所示的结构为例，当显示屏100的显示面垂直向下时，可将平面半透半反镜22与水平面倾斜45度设置，而使曲面半透半反镜23垂直水平面设置，使得双凸透镜21的光学中心与平面半透半反镜22的光学中心的第一连线垂直于平面半透半反镜22的光学中心与曲面半透半反镜23的光学中心的第二连线，以简化光路的设计。
如图1所示，双凸透镜21的光学中心与平面半透半反镜22的光学中心之间的距离是指：双凸透镜21背离显示屏100一侧的光学表面的中心点与平面半透半反镜22面向双凸透镜21一侧的光学表面的中心点之间的距离。在本公开实施例提供的近眼显示装置中，双凸透镜21的光学中心与平面半透半反镜22的光学中心之间距离为7mm-10mm，当取值为8.7mm-8.8mm时，成像效果较佳。
如图1所示，平面半透半反镜22的光学中心与曲面半透半反镜23的光 学中心之间的距离是指：平面半透半反镜22面向曲面半透半反镜23一侧的光学表面的中心点与曲面半透半反镜23面向平面半透半反镜22一侧的光学表面的中心点之间的距离。在本公开实施例提供的近眼显示装置中，平面半透半反镜22的光学中心与曲面半透半反镜23的光学中心之间的距离为8mm-11mm，当取值为9.7mm-9.8mm时，成像效果较佳。
成像系统中的各透镜的面型以及各透镜之间的距离均会影响到成像质量，本公开实施例考虑到场曲、畸变以及光学传递函数等多方面因素，确定各光学部件之间的间距，以及各光学部件的面型。
在具体实施时，在本公开实施例提供的近眼显示装置中，可以将双凸透镜21的两个光学表面设计为奇次非球面、偶次非球面或自由曲面中的任意一种。由于非球面透镜相对于球面透镜来说，可优化的参数更加全面，因此具有更好的成像质量。奇次非球面为非对称非球面，偶次非球面为对称非球面，考虑到加工难度，本公开实施例可以将双凸透镜21的两个光学表面设计为偶次非球面。
具体地，双凸透镜21的两个光学表面均可以满足以下关系：
Figure PCTCN2021070662-appb-000003
其中，z表示光学表面的面型方程，c表示曲率半径，k表示二次曲面系数，r表示半孔径，α 1、α 2、α 3、α 4、α 5均表示系数。
k的取值可以影响到光学表面的面型，α 1、α 2、α 3、α 4、α 5为高阶项的系数，高阶项的数量越多，则设计越精细，在进行光学设计时，可以通过增加高阶项的数量来优化双凸透镜的成像质量。
可选地，双凸透镜21靠近显示屏100一侧的光学表面在满足上式时，各参数的取值如下：
r＝-49.00863899098125mm；
k＝-95.04941082200814；
α 1＝0；
α 2＝-1.037904547482000×10 -6；
α 3＝-1.752251362999443×10 -8；
α 4＝7.636861093444737×10 -11；
α 5＝-4.351559618685465×10 -13。
可选地，双凸透镜21背离显示屏100一侧的光学表面在满足上式时，各参数的取值如下：
r＝14.05871803442135mm；
k＝-1.367399296176254；
α 1＝0；
α 2＝-6.706673225527226×10 -5；
α 3＝8.892596162790160×10 -7；
α 4＝2.719516289317158×10 -9；
α 5＝-2.562235658581397×10 -11。
由此，完成双凸透镜21的两个光学表面的光学设计。
在具体实施时，可以将曲面半透半反镜23的两个光学表面设计为奇次非球面、偶次非球面或自由曲面中的任意一种。由于非球面透镜相对于球面透镜来说，可优化的参数更加全面，因此具有更好的成像质量。奇次非球面为非对称非球面，偶次非球面为对称非球面，考虑到加工难度，本公开实施例可以将曲面半透半反镜23的两个光学表面设计为偶次非球面。
具体地，曲面半透半反镜23的两个光学表面均可以满足以下关系：
Figure PCTCN2021070662-appb-000004
其中，z表示光学表面的面型方程，c表示曲率半径，k表示二次曲面系数，r表示半孔径，α 1、α 2、α 3、α 4、α 5均表示系数。
k的取值可以影响到光学表面的面型，α 1、α 2、α 3、α 4、α 5为高阶项的系数，高阶项的数量越多，则设计越精细，在进行光学设计时，可以通过增加高阶项的数量来优化曲面半透半反镜的成像质量。
可选地，曲面半透半反镜23的光学表面在满足上式时，各参数的取值如下：
r＝-52.20409394488124mm；
k＝-1.604779554699603；
α 1＝0；
α 2＝-4.991846957838716×10 -6；
α 3＝2.130618444391338×10 -8；
α 4＝-1.601068438007377×10 -10；
α 5＝3.674816411704089×10 -13。
由此，完成曲面半透半反镜23的两个光学表面的光学设计。
双凸透镜21和曲面半透半反镜23的光学表面的参数取值可以根据成像系统最终在场曲、畸变以及光学传递函数等方面的表现来进行优化，双凸透镜21和曲面半透半反镜23的面型以及各光学部件之间的间距均会影响成像系统的成像质量，在进行光学设计时需要综合考虑多方面因素。
在进行光学设计时，双凸透镜21和曲面半透半反镜23也可以选用奇次非球面或自由曲面，本公开实施例仅以偶次非球面的实施方案进行举例说明，并不对双凸透镜21和曲面半透半反镜23的具体面型进行限制。当双凸透镜21和曲面半透半反镜23选用其它类型的面型时，对应的参数应当重新设置。
本公开实施例还提供了当成像系统中的各光学部件满足上述条件时成像系统200在场曲、畸变以及光学传递函数等方面的成像表现。
图2为本公开实施例提供的近眼显示装置的场曲图，其中，横坐标表示场曲量，纵坐标表示视场高度。成像系统在各视场高度下的场曲量越接近0说明成像效果越好。场曲图中示出了弧矢方向和子午方向的场曲量，其中，虚线表示弧矢方向的场曲量，实线表示子午方向的场曲量，不同灰度表示不同波长光线的场曲量。如图2所示，本公开实施例提供的成像系统200在经过参数优化之后场曲量控制在±0.1以内，场曲量较小，成像效果佳。
图3为本公开实施例提供的近眼显示装置的畸变图，其中，横坐标表示 畸变量，纵坐标表示视场高度。成像系统在各视场高度下的场曲量越接近0说明成像效果越好。畸变图中不同灰度表示不同波长光线的畸变量。如图3所示，本公开实施例提供的成像系统200在经过参数优化之后畸变量小于2％，畸变量较小，成像效果佳。
图4为本公开实施例提供的近眼显示装置的网格畸变图，其中，“×”表示真实成像点，“·”表示理想成像点。由图3可以看出，本公开实施例提供的成像系统200在经过参数优化之后，真实成像点与理想成像点的位置差距较小，网络畸变小于1.4％，畸变量较小，成像效果佳。
图5为本公开实施例提供的近眼显示装置的光学传递函数曲线图，其中，横坐标表示空间频率，纵坐标表示调制传递函数(Modulation Transfer Function，简称MTF)值，MTF值是反应光学系统的重要参数。图5中最上方的曲线表示视场角为0时对应的衍射极限，不同视场角下的MTF值越接近最上方的曲线表示成像系统的成像效果越好。光学传递函数曲线图中示出了弧矢方向和子午方向的MTF曲线，其中，虚线表示弧矢方向的MTF曲线，实线表示子午方向的MTF曲线，不同灰度表示不同波长光线的MTF曲线。如图5所示，本公开实施例提供的成像系统200在经过参数优化之后，全视场的光学传递函数在31lp/mm处均大于0.3，全视场的光学传递函数在62lp/mm处大于0.1，具有较佳的成像表现。
在具体加工过程中，双凸透镜21、平面半透半反镜22以及曲面半透半反镜23均可以采用光学玻璃、树脂、塑料等材料进行制作，在此不做限定。
其中，平面半透半镜22和曲面半透半反镜23的表面设置有光学薄膜，光学薄膜的光透射与光反射的比例为4:6～5:5。本公开实施例中的光学薄膜是利用薄膜干涉原理，通过调整光学薄膜的层数、材料的折射率以及厚度等参数，使其具有透射或反射的作用。调整以上参数还可以控制光学薄膜光透射与光反射的比例。
在实际应用中，平面半透半反镜22的反射光用于成像，但曲面半透半反镜23的反射光最终透过平面半透半反镜22才入射到人眼，因此平面半透半 反镜22的透射率与反射率相当，既不会过多地损失反射光也不会过多地损失透射光。而在应用于VR领域时，可以提高曲面半透半反镜23的反射率，以使更多的光线用于成像；而在应用于AR领域时，环境光需要透过曲面半透半反镜23参与合成图像，此时则需要合理设置曲面半透半反镜23的透射率和反射率。本公开实施例中，平面半透半镜22和曲面半透半反镜23表面的光学薄膜的光透射与光反射的比例可控制在4:6～5:5的范围内，具有较好的成像效果。
本公开实施例提供的上述近眼显示装置可以为眼镜或头盔，此时可以将曲面半透半反镜23复用为眼镜或头盔的镜片，从而减少近眼显示装置所使用的镜片数量。当近眼显示装置为眼镜时，其外观图可以参见图6。其中，左眼镜片可以设置一套成像系统和显示屏，右眼镜片可以设置另一套成像系统和显示屏。
本公开实施例提供的近眼显示装置，包括：显示屏，被配置为显示图像；成像系统，位于显示屏的出光侧，被配置为将显示屏的显示图像成像于人眼所在的位置；其中，成像系统包括：双凸透镜，位于显示屏的出光侧；平面半透半反镜，位于双凸透镜背离显示屏的一侧；曲面半透半反镜，位于平面半透半反镜的反射光路上；双凸透镜的光学中心与平面半透半反镜的光学中心的连线与平面半透半反镜的光学中心与曲面半透半反镜的光学中心的连线相交；双凸透镜被配置为将显示屏的显示图像放大，平面半透半反镜被配置为接收双凸透镜的成像光线并向曲面半透半反镜反射，曲面半透半反镜被配置为将成像光线会聚并向人眼所在的位置反射。平面半透半反镜与曲面半透半反镜具有对光线进行折返的作用，这样可以通过反射来增长光线路径，而不需要按照光路线路的长度来设计近眼显示装置，有利于缩小近眼显示装置的整体体积。成像系统中采用双凸透镜和曲面半透半反镜，这样可以对三个曲面进行优化，以提高成像系统的成像质量，避免为了优化参数而引入更多的成像器件，从整体上减少透镜的使用数量，以简化成像系统的结构，减轻近眼显示装置的整体重量。
尽管已描述了本公开的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本公开范围的所有变更和修改。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (16)

  1. 一种近眼显示装置，其中，包括：
    显示屏，被配置为显示图像；
    成像系统，位于所述显示屏的出光侧，被配置为将所述显示屏的显示图像成像于人眼所在的位置；其中，所述成像系统包括：
    双凸透镜，位于所述显示屏的出光侧，所述双凸透镜被配置为将所述显示屏的显示图像放大；
    平面半透半反镜，位于所述双凸透镜背离所述显示屏的一侧，所述平面半透半反镜的光学中心与所述双凸透镜的光学中心的连线为第一连线；所述平面半透半反镜被配置为接收所述双凸透镜的成像光线并反射；
    曲面半透半反镜，位于所述平面半透半反镜的反射光路上，所述曲面半透半反镜的光学中心与所述平面半透半反镜的光学中心的连线为第二连线，所述第一连线和所述第二连线相交；所述曲面半透半反镜被配置为将所述成像光线会聚并经过所述平面半透半反镜向人眼所在的位置反射。
  2. 如权利要求1所述的近眼显示装置，其中，所述显示屏位于所述成像系统的一倍焦距之内。
  3. 如权利要求1所述的近眼显示装置，其中，所述成像系统的出瞳距离大于18mm。
  4. 如权利要求1所述的近眼显示装置，其中，所述双凸透镜的光学中心与所述平面半透半反镜的光学中心之间的距离为7mm-10mm。
  5. 如权利要求4所述的近眼显示装置，其中，所述双凸透镜的光学中心与所述平面半透半反镜的光学中心之间的距离为8.7mm-8.8mm。
  6. 如权利要求4所述的近眼显示装置，其中，所述平面半透半反镜的光学中心与所述曲面半透半反镜的光学中心之间的距离为8mm-11mm。
  7. 如权利要求6所述的近眼显示装置，其中，所述平面半透半反镜的光学中心与所述曲面半透半反镜的光学中心之间的距离为9.7mm-9.8mm。
  8. 如权利要求1所述的近眼显示装置，其中，所述第一连线垂直于所述第二连线。
  9. 如权利要求1所述的近眼显示装置，其中，所述双凸透镜的两个光学表面为球面、奇次非球面、偶次非球面或自由曲面。
  10. 如权利要求9所述的近眼显示装置，其中，所述双凸透镜的两个光学表面均满足以下关系：
    Figure PCTCN2021070662-appb-100001
    其中，z表示光学表面的面型方程，c表示曲率半径，k表示二次曲面系数，r表示半孔径，α 1、α 2、α 3、α 4、α 5均表示系数。
  11. 如权利要求10所述的近眼显示装置，其中，所述双凸透镜靠近所述显示屏一侧的光学表面满足：
    r＝-49.00863899098125mm；
    k＝-95.04941082200814；
    α 1＝0；
    α 2＝-1.037904547482000×10 -6；
    α 3＝-1.752251362999443×10 -8；
    α 4＝7.636861093444737×10 -11；
    α 5＝-4.351559618685465×10 -13；
    所述双凸透镜背离所述显示屏一侧的光学表面满足：
    r＝14.05871803442135mm；
    k＝-1.367399296176254；
    α 1＝0；
    α 2＝-6.706673225527226×10 -5；
    α 3＝8.892596162790160×10 -7；
    α 4＝2.719516289317158×10 -9；
    α 5＝-2.562235658581397×10 -11。
  12. 如权利要求1所述的近眼显示装置，其中，所述曲面半透半反镜的两个光学表面相互平行；所述曲面半透半反镜的两个光学表面为球面、奇次非球面、偶次非球面或自由曲面。
  13. 如权利要求12所述的近眼显示装置，其中，所述曲面半透半反镜的两个光学表面均满足以下关系：
    Figure PCTCN2021070662-appb-100002
    其中，z表示光学表面的面型方程，c表示曲率半径，k表示二次曲面系数，r表示半孔径，α 1、α 2、α 3、α 4、α 5均表示系数。
  14. 如权利要求13所述的近眼显示装置，其中，所述曲面半透半反镜的光学表面满足：
    r＝-52.20409394488124mm；
    k＝-1.604779554699603；
    α 1＝0；
    α 2＝-4.991846957838716×10 -6；
    α 3＝2.130618444391338×10 -8；
    α 4＝-1.601068438007377×10 -10；
    α 5＝3.674816411704089×10 -13。
  15. 如权利要求1-14任一项所述的近眼显示装置，其中，所述平面半透半镜的表面和所述曲面半透半反镜的表面均设置有光学薄膜，所述光学薄膜的光透射与光反射的比例为4:6～5:5。
  16. 如权利要求1-14任一项所述的近眼显示装置，其中，所述近眼显示装置为眼镜或头盔；
    所述曲面半透半反镜复用为所述眼镜或头盔的镜片。
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