WO2020248535A1 - 一种纳米波导镜片及ar显示装置 - Google Patents

一种纳米波导镜片及ar显示装置 Download PDF

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Publication number
WO2020248535A1
WO2020248535A1 PCT/CN2019/122598 CN2019122598W WO2020248535A1 WO 2020248535 A1 WO2020248535 A1 WO 2020248535A1 CN 2019122598 W CN2019122598 W CN 2019122598W WO 2020248535 A1 WO2020248535 A1 WO 2020248535A1
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Prior art keywords
grating
nano
waveguide
waveguide lens
gradient
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English (en)
French (fr)
Inventor
罗明辉
乔文
李玲
李瑞彬
周振
熊金艳
陈林森
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Suzhou University
SVG Tech Group Co Ltd
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Suzhou University
SVG Tech Group Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • 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
    • 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
    • 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
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view

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  • the invention relates to the field of display technology, in particular to a nano-waveguide lens and an AR display device.
  • AR Augmented Reality
  • AR Augmented Reality
  • the goal of this technology is to put the virtual world on the screen and interact with the real world.
  • the virtual information In order to realize the "seamless" integration of real world information and virtual world information, not only the real world information is displayed, but also the virtual information is displayed at the same time.
  • the two kinds of information complement and superimpose each other, presenting users with a more perceptual effect. Rich new environment. In many fields, such as industrial manufacturing and maintenance, medical, military, entertainment and games, education, etc., it has huge potential application value.
  • waveguide lenses with both transparency and imaging/light guiding effects are the most critical component for AR hardware implementation.
  • the pupil dilation ability is an important parameter of waveguide lenses, which directly affects the comfort of human eyes and the crowd. Fitness.
  • brightness uniformity has always been the main reason for limiting the display of large exit pupils.
  • the light emitted from the light source is incident on the first grating 13 of the waveguide lens 1 in a certain direction, and passes through the first grating. 13
  • the grating is diffracted, and the diffracted light is transmitted to the second grating along the direction of total reflection in the waveguide 11.
  • the light is totally reflected and diffracted several times in the second grating, and the diffraction efficiency is gradually reduced.
  • the human eye can clearly observe the brightness gradient or sudden change, which directly affects the viewing experience and causes poorer viewing experience. The experience effect.
  • the purpose of the present invention is to provide a nano-waveguide lens and an AR display device, which utilizes the gradation of the grating to reduce the brightness gradation.
  • the gradual change of the plurality of grating units in the second grating is from the side close to the first grating to the side away from the first grating, and the third grating is more
  • the gradient of each of the grating units is from a side close to the second grating to a side far from the second grating.
  • the first grating adopts a height gradation or a gradual duty cycle method, and the gradual change of a plurality of grating units in the first grating approaches the first grating from the side away from the second grating. Gradient on one side of the second grating.
  • the first grating, the second grating, and the third grating are each a tilted grating, a volume grating, or a rectangular grating.
  • the first grating, the second grating and the third grating are all nano-scale tilted gratings.
  • the range of the height gradient or the duty cycle gradient is the same.
  • the height of the grating is gradually changed from 100 to 400 nm, and the duty ratio of the grating is gradually changed from 0.1 to 0.7.
  • the first grating, the second grating and the third grating are arranged at different positions on the same surface of the waveguide substrate.
  • the present invention also provides an AR display device including the above-mentioned nano-waveguide lens.
  • the nano-waveguide lens provided by the present invention realizes the reduction of brightness gradient by adjusting the height or duty ratio of the multiple grating units in the second grating or/and the third grating, thereby avoiding the brightness gradient or sudden change.
  • the bright and dark windows enhance the viewing angle effect and increase the field of view, exit pupil distance or exit pupil range of the nanowaveguide lens.
  • FIG. 2 is a schematic diagram of the structure of the nano-waveguide lens of the present invention.
  • FIG. 3 is a schematic diagram of image light information transmission of the nano-waveguide lens of the present invention.
  • FIG. 6 is a schematic diagram of the diffraction effect of the highly gradual tilt grating according to the first embodiment of the present invention.
  • FIG. 7 is an enlarged view of A in FIG. 3 in the second embodiment of the present invention.
  • FIG. 8 is a schematic diagram of the diffraction effect of the duty-cycle gradient grating according to the second embodiment of the invention.
  • the nano-waveguide lens provided in this embodiment includes a waveguide substrate 21 and a nanoscale grating arranged on the surface of the waveguide substrate 21 for diffracting image light information to satisfy the total reflection of the waveguide substrate 21 Area.
  • the grating area includes a first grating 23 for coupling image light information into the waveguide substrate 21, a second grating 25 for changing the direction of image light information transmitted through the waveguide substrate 21, and a second grating 25
  • the image light information transmitted by 25 and the waveguide substrate 21 is projected to the third grating 27 in the outer space of the waveguide lens.
  • the second grating 25 or/and the third grating 27 are set in a manner of gradual change in height or duty cycle. The height or duty cycle of multiple grating units in the second grating 25 or/and the third grating 27 is adjusted to reduce Brightness gradient.
  • Each grating is set in a way that the height is gradual from 100-400nm or the duty cycle is from 0.1-0.7, and each grating is a slanted grating, volume grating or rectangular grating; when different gratings use the same type of grating unit, its grating unit Use the same range of height gradient or duty cycle gradient.
  • the external image light information is incident from the first grating 23 of the waveguide lens 2 and transmitted to the third grating 27 via the second grating 25.
  • the external image light information when the external image light information is optically coupled to the waveguide lens 2, it first enters the first grating 23, and is diffracted by the grating unit of the first grating 23, and the angle of the diffracted light meets the total reflection of the waveguide substrate 21; the light is transmitted along the total reflection direction, Coupled to the second grating 25, the light is diffracted by the grating unit of the second grating 25 to produce multiple total reflections (the number of total reflections depends on the thickness of the waveguide substrate 21 and the diffraction angle), and is transmitted to the third grating 27, Diffracted by the grating unit of the third grating 27, the output light is focused from the third grating 27 to the retina of the human eye, enabling the human eye to see a realistic virtual stereo image, realizing horizontal and vertical field expansion and real world information and virtual world information "
  • the basic principle that needs to be met is: the output image light information and the input image light information need to meet the parallel condition, so as to expand the entire range of the exit pupil Inside, the image seen will not be distorted. Therefore, when the waveguide lens is designed, the light needs to meet the phase conservation condition, that is, the optical path directions of the first grating 23 and the third grating 27 need to be completely consistent.
  • each grating is a nano-scale tilted grating, and the tilted grating adopts a highly gradual manner.
  • this highly gradual nano-level tilted grating it also has an imaging function for light at a specific angle of incidence, and at the same time uniformizes the diffraction efficiency, avoiding the brightness gradient or sudden change after the light passes through the gratings
  • the light and dark windows brought by it also increase the field of view, exit pupil distance or exit pupil range of the nanowaveguide lens.
  • the diffraction efficiency varies with the height of the grating, as shown in FIG. 6,
  • the diffraction efficiency increases from 43% to 95%.
  • the duty cycle gradient gradient grating unit 29 has a tilt angle of 30°, a period of 400 nm, and a grating height of 300 nm; the diffraction efficiency varies with the grating duty cycle, as shown in Figure 8, when the grating When the space ratio changes from 0.2-0.55, the diffraction efficiency increases from 20% to 96%.
  • This embodiment also provides an AR display device including the above-mentioned nano-waveguide lens.
  • the difference between the nano-waveguide lens provided by the third embodiment of the present invention and the above-mentioned first and second embodiments is that, in this embodiment, the first and third grating regions 23 and 27 are both capable of realizing light on the waveguide substrate. 21. Ordinary grating with total reflection.
  • the second grating 25 adopts a highly gradual or gradual duty cycle method to make the diffraction efficiency of the second grating 25 uniform, and avoid the bright and dark windows caused by the brightness gradient or sudden change, so as to enter the third grating 27.
  • the brightness of the light is constant relative to the brightness of the second grating, so as to avoid the sudden change of the brightness of the light output from the third grating relative to the brightness of the light coupled into the first grating, thereby affecting the viewing angle effect.
  • the difference between the nano-waveguide lens provided by the third embodiment of the present invention and the above-mentioned first and second embodiments is that, in this embodiment, the first and second gratings 23 and 25 are both capable of realizing light on the waveguide substrate 21
  • the third grating 27 adopts a highly gradual or gradual duty cycle method to make the diffraction efficiency of the third grating 27 uniform, avoid bright and dark windows caused by brightness gradients or sudden changes, and avoid output from the third grating
  • the sudden change in light brightness affects the viewing angle effect, while increasing the field of view, exit pupil distance or exit pupil range of the nanowaveguide lens.
  • the grating adopts a highly gradual or duty-cycle gradual manner to realize the uniform diffraction efficiency of the external image light information in the waveguide lens, reduce the brightness gradation, and realize the brightness of the projected image light information is unchanged. Avoid bright and dark windows caused by brightness gradients or sudden changes, enhance the viewing angle effect, and increase the field of view, exit pupil distance or exit pupil range of the nano-waveguide lens; and the grating unit in this grating is simple in design and easy to manufacture; At the same time, a grating unit is used to realize the total reflection of the waveguide after the image light information is diffracted, which reduces the cost and difficulty of manufacturing the waveguide lens.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

一种AR显示装置，包括纳米波导镜片，纳米波导镜片包括波导衬底（21）、设置在波导衬底（21）表面用于将图像光信息衍射后满足波导衬底（21）全反射的纳米级光栅区，光栅区包括用于将图像光信息耦合进入波导衬底（21）的第一光栅（23）、用于将经波导衬底（21）传导过来的图像光信息改变方向的第二光栅（25）、用于将经第二光栅（25）及波导衬底（21）传导过来的图像光信息投射到波导镜片外部空间中的第三光栅（27），第二光栅（25）或/和第三光栅（27）采用高度渐变或者占空比渐变的方式设置。利用光栅的渐变来实现亮度渐变的减弱，增强了视角效果，增大了波导镜片的视场角、出瞳距离或者出瞳范围。

Description

一种纳米波导镜片及AR显示装置
本申请要求了申请日为2019年6月11日，申请号为201910502862.7的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及显示技术领域，特别是涉及一种纳米波导镜片及AR显示装置。
背景技术
AR(增强现实Augmented Reality)技术，是一种实时地计算摄影机影像的位置及角度并加上相应图像的技术，这种技术的目标是在屏幕上把虚拟世界套在现实世界并进行互动。以实现将真实世界信息和虚拟世界信息“无缝”集成的技术，不仅展现了真实世界的信息，而且将虚拟的信息同时显示出来，两种信息相互补充、叠加，呈现给用户一个感知效果更丰富的新环境。在诸多领域，例如工业制造和维修领域、医疗领域、军事领域、娱乐游戏领域、教育领域等，有着巨大的潜在应用价值。
在AR产业链中，同时具有透明效果和成像/导光效果的波导镜片是AR硬件得以实施的最关键部件，其中扩瞳能力是波导镜片的一个重要参数，直接影响人眼观察舒适度及人群的适应度。而在AR显示技术中，亮度均匀化一直是限制大出瞳显示的主要原因，如图1所示，从光源发出的光以一定方向入射至波导镜片1的第一光栅13，经第一光栅13光栅衍射，衍射光线沿波导11内全反射方向传导至第二光栅。光线在第二光栅经数次全反射及衍射，衍射效率逐渐降低，经第三光栅17导出，在出瞳范围内，人眼可以明显观察到亮度渐变或突变，直观影响观看体验，造成较差的体验效果。
前面的叙述在于提供一般的背景信息，并不一定构成现有技术。
发明内容
本发明的目的在于提供一种纳米波导镜片及AR显示装置，利用光栅的渐变，实现亮度渐变的减弱。
本发明提供一种纳米波导镜片，包括波导衬底、设置在所述波导衬底表面用于将图像光信息衍射后满足所述波导衬底全反射的纳米级光栅区，所述光栅区包括用于将图像光信息耦合进入所述波导衬底的第一光栅、用于将经所述波导衬底传导过来的图像光信息改变方向的第二光栅、用于将经所述第二光栅及所述波导衬底传导过来的图像光信息投射到波导镜片外部空间中的第三光栅，所述第二光栅或/和所述第三光栅采用高度渐变或者占空比渐变的方式设置，调节所述第二光栅或/和所述第三光栅中多个光栅单元的高度或者占空比，用以减弱亮度渐变。
在其中一实施例中，多个所述光栅单元的渐变方式为高度由低到高或者占空比由小到大。
在其中一实施例中，所述第二光栅中多个所述光栅单元的渐变方式为自靠近所述第一光栅一侧向远离所述第一光栅一侧渐变，所述第三光栅中多个所述光栅单元的渐变方式为自靠近所述第二光栅一侧向远离所述第二光栅一侧渐变。
在其中一实施例中，所述第一光栅采用高度渐变或者占空比渐变的方式，所述第一光栅中多个光栅单元的渐变方式自远离所述第二光栅一侧向靠近所述第二光栅一侧渐变。
在其中一实施例中，所述第一光栅、所述第二光栅、所述第三光栅各自为倾斜光栅或体光栅或矩形光栅。
在其中一实施例中，所述第一光栅、所述第二光栅和所述第三光栅均为纳米级倾斜光栅。
在其中一实施例中，当各光栅采用同一种光栅单元时，所述高度渐变或者所述占空比渐变的范围相同。
在其中一实施例中，所述光栅的高度从100-400nm渐变，所述光栅的占 空比从0.1-0.7渐变。
在其中一实施例中，所述第一光栅、所述第二光栅和所述第三光栅设置在所述波导衬底的同一表面的不同位置。
本发明还提供一种AR显示装置，包括上述纳米波导镜片。
本发明提供的纳米波导镜片，通过调节所述第二光栅或/和所述第三光栅中多个光栅单元的高度或者占空比，实现亮度渐变的减弱，从而避免亮度渐变或突变带来的明暗视窗，增强了视角效果，同时增大纳米波导镜片的视场角、出瞳距离或者出瞳范围。
附图说明
图1为现有波导镜片的图像光信息传递示意图；
图2为本发明纳米波导镜片的结构示意图；
图3为本发明纳米波导镜片的图像光信息传递示意图；
图4为本发明倾斜光栅的衍射示意图；
图5为图3中A在本发明第一实施例的放大图；
图6为本发明第一实施例高度渐变倾斜光栅的衍射效果示意图；
[根据细则91更正 06.01.2020]　
图7为图3中A在本发明第二实施例的放大图；
[根据细则91更正 06.01.2020]　
图8为本发明第二实施例占空比渐变倾斜光栅的衍射效果示意图。
具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。
第一实施例
请参图2至图3，本实施例中提供的纳米波导镜片，包括波导衬底21、设置在波导衬底21表面用于将图像光信息衍射后满足波导衬底21全反射的纳米级光栅区。光栅区包括用于将图像光信息耦合进入波导衬底21的第一光 栅23、用于将经波导衬底21传导过来的图像光信息改变方向的第二光栅25、用于将经第二光栅25及波导衬底21传导过来的图像光信息投射到波导镜片外部空间中的第三光栅27。第二光栅25或/和第三光栅27采用高度渐变或者占空比渐变的方式设置，调节第二光栅25或/和第三光栅27中多个光栅单元的高度或者占空比，用以减弱亮度渐变。
第一光栅23、第二光栅25和第三光栅27分别设置在波导衬底21同一侧表面的不同位置，且各光栅区域之间有间隙。第一光栅23采用高度渐变或者占空比渐变的方式设置。各光栅中的多个光栅单元的渐变方式为高度由低到高或者占空比由小到大。
其中，第一光栅23中多个光栅单元的渐变方式自远离所述第二光栅一侧向靠近所述第二光栅一侧渐变；第二光栅25中多个光栅单元的渐变方式为自靠近第一光栅23一侧向远离第一光栅23一侧渐变；第三光栅27中多个光栅单元的渐变方式为自靠近第二光栅25一侧向远离第二光栅25一侧渐变。
各光栅采用高度从100-400nm渐变或占空比从0.1-0.7渐变的方式设置，且各光栅为倾斜光栅或体光栅或矩形光栅；当不同的光栅采用同一类型的光栅单元时，其光栅单元采用同一范围的高度渐变或者占空比渐变。
如图4所示，入射光以角度α入射倾斜光栅时，衍射光线以角度β出射。其中，衍射角度取决于光栅周期、入射角度等，光栅深度和占空比调控衍射效率。通过合理调控倾斜光栅参数，可以实现某一波段光以大衍射角度出射，使此时一级次衍射效率最大，零级衍射效率降至最小，从而实现衍射效率均匀化，避免亮度渐变或突变带来的明暗视窗而影响视角效果。
工作时，外部图像光信息从波导镜片2的第一光栅23入射，经第二光栅25传导至第三光栅27。具体地，外部图像光信息光耦合至波导镜片2时，首先进入第一光栅23，经第一光栅23的光栅单元衍射，衍射光线角度满足波导衬底21全反射；光线沿全反射方向传导，耦合至第二光栅25，经第二光栅25的光栅单元衍射使光线发生多次全反射的转折(全反射的次数取决于波导衬底 21的厚度以及衍射角)，传导至第三光栅27，经第三光栅27的光栅单元衍射，从第三光栅27聚焦输出光线至人眼视网膜，使人眼看到逼真的虚拟立体图像，实现水平和竖直方向视场扩大以及真实世界信息和虚拟世界信息“无缝”集成。
在波导镜片对图像光信息进行传输，并对其出瞳进行扩大时，需要满足的基本原则是：输出的图像光信息和输入的图像光信息需要满足平行条件，这样在整个扩大出瞳的范围内，看到的图像不会产生畸变。因此，波导镜片在设计时，光线需要满足相位守恒条件，即，第一光栅23和第三光栅27的光路方向需要完全一致。
在本实施例中，各光栅均为纳米级倾斜光栅，且倾斜光栅采用高度渐变的方式。通过此种高度渐变的纳米级倾斜光栅，除了实现光路折叠和图像融合外，还对特定入射角度的光线具有成像功能，同时使衍射效率均匀化，避免光线在经各光栅后造成亮度渐变或突变带来的明暗视窗，同时增大纳米波导镜片的视场角、出瞳距离或者出瞳范围。
如图5所示，在本实施例中，当高度渐变倾斜光栅单元28倾斜角度为30°，周期为400nm，占空比为0.5，此时衍射效率随光栅高度变化，如图6所示，当光栅高度从200-400nm变化时，衍射效率从43％增大至95％。
本实施例还提供一种AR显示装置，包括上述的纳米波导镜片。
第二实施例
本发明第二实施例提供的纳米波导镜片与上述第一实施例的区别在于，在本实施例中，各光栅的倾斜光栅为占空比渐变倾斜光栅单元29，以实现出瞳范围内的增大以及衍射效率均匀化，避免亮度渐变或突变带来的明暗视窗。
如图7所示，当占空比渐变倾斜光栅单元29倾斜角度为30°，周期为400nm，光栅高度为300nm；此时衍射效率随光栅占空比变化，如图8所示，当光栅占空比从0.2-0.55变化时，衍射效率从20％增大至96％。
本实施例还提供一种AR显示装置，包括上述的纳米波导镜片。
第三实施例
本发明第三实施例提供的纳米波导镜片与上述第一实施例和第二实施例的区别在于，在本实施例中，第一、三光栅区域23、27均为能实现光线在波导衬底21全反射的普通光栅，第二光栅25采用高度渐变或者占空比渐变的方式，使第二光栅25的衍射效率均匀化，避免亮度渐变或突变带来的明暗视窗，以实现进入第三光栅27光线亮度相对于第二光栅的光线亮度不变，避免从第三光栅输出光线亮度相对于耦入第一光栅的光线亮度突变，从而影响视角效果。
第四实施例
本发明第三实施例提供的纳米波导镜片与上述第一实施例和第二实施例的区别在于，在本实施例中，第一、二光栅23、25均为能实现光线在波导衬底21全反射的普通光栅区域，第三光栅27采用高度渐变或者占空比渐变的方式，使第三光栅27的衍射效率均匀化，避免亮度渐变或突变带来的明暗视窗，避免从第三光栅输出光线亮度突变而影响视角效果，同时增大纳米波导镜片的视场角、出瞳距离或者出瞳范围。
在本发明产品中，通过光栅采用高度渐变或者占空比渐变的方式，实现外部图像光信息在波导镜片中的均匀化衍射效率，减弱亮度渐变，从而实现投射出的图像光信息亮度不变，避免亮度渐变或突变带来的明暗视窗，增强了视角效果，同时增大纳米波导镜片的视场角、出瞳距离或者出瞳范围；且此种光栅中的光栅单元的设计简单，制作容易；同时，利用一种光栅单元来实现图像光信息衍射后满足波导的全反射，降低波导镜片制作的成本和难度。
在附图中，为了清晰起见，会夸大层和区域的尺寸和相对尺寸。应当理解的是，当元件例如层、区域或基板被称作“形成在”、“设置在”或“位于”另一元件上时，该元件可以直接设置在所述另一元件上，或者也可以存在中间元件。相反，当元件被称作“直接形成在”或“直接设置在”另一元件上时，不存在中间元件。
在本文中，术语“上”、“下”、“前”、“后”、“左”、“右”、“顶”、“底”、“内”、“外”、“竖直”、“水平”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了表达技术方案的清楚及描述方便，因此不能理解为对本发明的限制。
以上所述实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，除了包含所列的那些要素，而且还可包含没有明确列出的其他要素。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (10)

  1. 一种纳米波导镜片，其特征在于，包括波导衬底、设置在所述波导衬底表面用于将图像光信息衍射后满足所述波导衬底全反射的纳米级光栅区，所述光栅区包括用于将图像光信息耦合进入所述波导衬底的第一光栅、用于将经所述波导衬底传导过来的图像光信息改变方向的第二光栅、用于将经所述第二光栅及所述波导衬底传导过来的图像光信息投射到波导镜片外部空间中的第三光栅，所述第二光栅或/和所述第三光栅采用高度渐变或者占空比渐变的方式设置，调节所述第二光栅或/和所述第三光栅中多个光栅单元的高度或者占空比，用以减弱亮度渐变。
  2. 如权利要求1所述的纳米波导镜片，其特征在于，多个所述光栅单元的渐变方式为高度由低到高或者占空比由小到大。
  3. 如权利要求2所述的纳米波导镜片，其特征在于，所述第二光栅中多个所述光栅单元的渐变方式为自靠近所述第一光栅一侧向远离所述第一光栅一侧渐变，所述第三光栅中多个所述光栅单元的渐变方式为自靠近所述第二光栅一侧向远离所述第二光栅一侧渐变。
  4. 如权利要求1所述的纳米波导镜片，其特征在于，所述第一光栅采用高度渐变或者占空比渐变的方式，所述第一光栅中多个光栅单元的渐变方式自远离所述第二光栅一侧向靠近所述第二光栅一侧渐变。
  5. 如权利要求1所述的纳米波导镜片，其特征在于，所述第一光栅、所述第二光栅、所述第三光栅各自为倾斜光栅或体光栅或矩形光栅。
  6. 如权利要求5所述的纳米波导镜片，其特征在于，所述第一光栅、所述第二光栅和所述第三光栅均为纳米级倾斜光栅。
  7. 如权利要求5所述的纳米波导镜片，其特征在于，当各光栅采用同一种光栅单元时，所述高度渐变或者所述占空比渐变的范围相同。
  8. 如权利要求7所述的纳米波导镜片，其特征在于，所述光栅的高度从100-400nm渐变，所述光栅的占空比从0.1-0.7渐变。
  9. 如权利要求1所述的纳米波导镜片，其特征在于，所述第一光栅、所 述第二光栅和所述第三光栅设置在所述波导衬底的同一表面的不同位置。
  10. 一种AR显示装置，其特征在于，包括如权利要求1至9任一项所述的纳米波导镜片。
PCT/CN2019/122598 2019-06-11 2019-12-03 一种纳米波导镜片及ar显示装置 Ceased WO2020248535A1 (zh)

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