WO2020181883A1 - 光学成像结构及头戴显示设备 - Google Patents

光学成像结构及头戴显示设备 Download PDF

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Publication number
WO2020181883A1
WO2020181883A1 PCT/CN2019/129188 CN2019129188W WO2020181883A1 WO 2020181883 A1 WO2020181883 A1 WO 2020181883A1 CN 2019129188 W CN2019129188 W CN 2019129188W WO 2020181883 A1 WO2020181883 A1 WO 2020181883A1
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Prior art keywords
phase compensation
compensation unit
unit
transmission direction
optical imaging
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PCT/CN2019/129188
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English (en)
French (fr)
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翟睿智
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歌尔股份有限公司
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Publication of WO2020181883A1 publication Critical patent/WO2020181883A1/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
    • 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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising

Definitions

  • the present invention relates to the technical field of head-mounted display devices, in particular to an optical imaging structure and a head-mounted display device.
  • a head-mounted display device is an electronic product that can provide an immersive experience for wearers. Therefore, products such as head-mounted display devices are developing rapidly, and are generally used in fields such as entertainment, military, and medicine.
  • VR virtual reality
  • AR Augmented Reality
  • Mixed Reality Mixed Reality
  • MR Mixed Reality
  • the current miniaturization technical idea is to refraction and reflect the light path inside the head-mounted display device to keep the light path in a certain Back and forth in the space, thereby reducing the overall volume of the head-mounted display device, but the current head-mounted display device that adopts the refractive optical path is prone to produce ghost images, which are like a kind of light that is reflected or reflected on the surface of the optical lens.
  • the additional image formed by transmission, the general ghost image is generated near the focal plane of the optical system, which causes the user wearing the head-mounted display device to observe the ghost image.
  • the ghost image and the standard image coexist and partially overlap, reducing the user’s wearing Sensory experience during use.
  • the optical imaging structure proposed by the present invention includes:
  • a display unit the display unit is used to emit a display light beam
  • An imaging component configured to receive the display light beam emitted by the display unit, and cause the display light beam to propagate in the imaging component, and when the display light beam propagates in the imaging component, a ghost beam is generated;
  • the cancellation component is configured to receive the ghost beam, the cancellation component has a first transmission direction, and the first transmission direction is different from the polarization direction of the ghost beam.
  • the elimination component includes a first polarization unit having the first transmission direction, and the first transmission direction and the polarization direction of the ghost beam are perpendicular to each other.
  • the optical imaging structure further includes a first phase compensation unit, the first phase compensation unit is disposed in the optical path between the imaging component and the cancellation component, and the first phase compensation unit is used for The ghost beam is converted into linearly polarized light.
  • the optical imaging structure further includes a first phase compensation unit, the first phase compensation unit is disposed on the light exit surface of the imaging component, or the first phase compensation unit is disposed on the entrance of the cancellation component Optical surface, the first phase compensation unit is used to convert the ghost beam into linearly polarized light.
  • the first phase compensation unit is a quarter wave plate or a phase compensation film.
  • the imaging component includes a first lens and a second lens arranged in sequence along the propagation direction of the display light beam, a second polarizing unit is provided on the light incident surface of the first lens, and the second polarizing unit has The second transmission direction is the same as the polarization direction of the display light beam.
  • the imaging assembly further includes a transflective and transflective unit disposed on the light incident surface of the second lens, and the display beam passes through the transflective and transflective unit to form a reflected imaging beam and a transmitted ghost.
  • Image beam wherein the first transmission direction and the second transmission direction are perpendicular to each other.
  • the imaging assembly further includes a second phase compensation unit, the second phase compensation unit is a quarter wave plate or a phase compensation film, and the second phase compensation unit is disposed on the first lens Glossy surface.
  • the second phase compensation unit is a quarter wave plate
  • the slow axis of the first phase compensation unit and the slow axis of the second phase compensation unit both have an angle of 45° with the first transmission direction;
  • the fast axis of the first phase compensation unit and the fast axis of the second phase compensation unit both have an angle of 45° with the first transmission direction.
  • the present invention also provides a head-mounted display device, including the optical imaging structure described above, the head-mounted display device further includes a housing, and the optical imaging structure is disposed in the housing.
  • the display unit emits a display light beam, which generates a ghost beam when the display light beam passes through the imaging component, and the elimination component is provided with a first transmission direction, and the first transmission direction can ensure the same light beam as its transmission direction Transmit and block light beams with different transmission directions. Because the polarization direction of the ghost beam is different from the first transmission direction, the ghost beam is blocked by the elimination component and cannot pass through the elimination component, effectively avoiding the ghost beam Imaging at the position of the human eye improves the user's wearing experience.
  • FIG. 1 is a schematic structural diagram of an embodiment of the optical imaging structure of the present invention.
  • FIG. 2 is a schematic diagram of the propagation path of the ghost beam of the optical imaging structure of the present invention in FIG. 1;
  • FIG. 3 is a schematic diagram showing the propagation path of a light beam in the optical imaging structure of the present invention in FIG. 1;
  • FIG. 4 is a schematic diagram of the propagation direction of the imaging beam and the ghost beam in the optical imaging structure of the present invention
  • Label name Label name 100 Display unit 230 Second polarizing unit 110 Display beam 240 Semi-reflective unit 111 ghost beam 250
  • the second phase compensation unit 112 Imaging beam 300 Eliminate components 200 Imaging components 400
  • the terms “connected”, “fixed”, etc. should be understood in a broad sense, for example, “fixed” can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise.
  • “fixed” can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise.
  • fixed can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise.
  • the optical imaging structure proposed by the present invention includes: a display unit 100, an imaging component 200 and an elimination component 300.
  • the display unit 100 is used to emit the display light beam 110; the imaging assembly 200 is used to receive the display light beam 110 emitted by the display unit 100 and make the display light beam 110 propagate in the imaging assembly 200.
  • the display light beam 110 propagates in the imaging assembly 200, ghosts are generated.
  • Image beam 111; the elimination component 300 is used to receive the ghost beam 111, the elimination component 300 is provided with a first transmission direction (not shown), and the first transmission direction is different from the polarization direction of the ghost beam 111.
  • the display unit 100 emits a display light beam 110, and when the display light beam 110 passes through the imaging assembly 200, a ghost beam 111 is generated.
  • the elimination assembly 300 is provided with a first transmission direction, and the first transmission direction can ensure The light beam with the same transmission direction passes through and blocks the light beam with the different transmission direction. Because the polarization direction of the ghost beam 111 is different from the first transmission direction, the ghost beam 111 is blocked by the elimination component 300 and cannot pass through the Eliminating the component 300 effectively prevents the ghost beam 111 from being imaged at the position of the human eye 500 and improves the user's wearing experience.
  • the canceling assembly 300 includes a first polarization unit (not shown), the first polarization unit has a first transmission direction, and the first transmission direction and the polarization direction of the ghost beam 111 are perpendicular to each other. Specifically, the first transmission direction can be Ensure that the light beam with the same transmission direction is transmitted.
  • the polarization direction of the transmitted beam and the first transmission direction are at an angle of 0°, because the first transmission direction is perpendicular to the polarization direction of the ghost beam 111 Therefore, it can be seen that the angle between the first transmission direction and the polarization direction of the ghost beam 111 is 90°, that is to say, the angle between the first transmission direction and the polarization direction of the ghost beam 111 is at the maximum, which can further effectively block the ghost beam. 111.
  • the optical imaging structure further includes a first phase compensation unit 400.
  • the first phase compensation unit 400 is disposed in the optical path between the imaging component 200 and the cancellation component 300.
  • the first phase compensation unit 400 is used to convert the ghost beam 111 It is linearly polarized light. Because the polarization direction of circularly polarized light or elliptical polarized light is right-handed or left-handed, the canceling component 300 has a poor canceling effect on the ghost beam 111.
  • the ghost beam 111 is converted into linear by the first phase compensation unit 400
  • the polarization direction of the ghost beam 111 in the polarization and linear polarization state is single, so that the canceling component 300 blocks the transmission of the ghost beam 111 and improves the canceling effect of the canceling component 300 on the ghost beam 111.
  • the optical imaging structure further includes a first phase compensation unit 400.
  • the first phase compensation unit 400 is disposed on the light exit surface of the imaging component 200, or the first phase compensation unit 400 is disposed on the light entrance surface of the cancellation component 300.
  • the first phase compensation unit 400 is used to convert the ghost beam 111 into linearly polarized light.
  • the first phase compensation unit 400 is coated on the light-emitting surface of the imaging component 200 by optical adhesive, or is coated by vacuum coating.
  • the first phase compensation unit 400 is plated on the light-emitting surface of the imaging component 200, and the first phase compensation unit 400 is coated on the light-incident surface of the elimination component 300 by optical adhesive, or the first phase compensation unit is vacuum coated 400 is plated on the light incident surface of the elimination component 300.
  • the first phase compensation unit 400 is a quarter-wave plate or a phase compensation film, and the first phase compensation unit 400 effectively ensures that the linearly polarized light passing through is converted into circularly polarized light, or the circularly polarized light is converted It is linearly polarized light.
  • the imaging assembly 200 includes a first lens 210 and a second lens 220 arranged in sequence along the propagation direction of the display beam 110.
  • the first lens 210 and the second lens 220 are any one of a plano-convex lens, a meniscus lens, or a biconvex lens.
  • the first lens 210 and the second lens 220 are used for imaging and display, wherein the light incident surface of the first lens 210 is provided with a second polarizing unit 230, and the second polarizing unit 230 has a second transmission direction (not shown).
  • the second transmission direction is the same as the polarization direction of the display light beam 110.
  • the polarization state of the display light beam 110 is a linear polarization state
  • the second transmission direction has the same transmission direction as the polarization direction of the display light beam 110, which can effectively ensure the linear polarization state
  • the display light beam 110 is transmitted through and enters the imaging assembly 200, wherein the second polarizing unit 230 is a film layer attached to the light incident surface of the first lens 210 or plated on the light incident surface of the first lens 210.
  • the imaging assembly 200 further includes a transflective and transflective unit 240 disposed on the light incident surface of the second lens 220, and the display light beam 110 passes through the transflective and transflective unit 240 to form a reflected imaging beam 112 and a transmissive ghost beam 111, in which the first transmission direction and the second transmission direction are perpendicular to each other, specifically, the semi-reflective and semi-transparent unit 240 is a semi-reflective and semi-transparent film, and the semi-reflective and semi-transparent unit 240 is attached to the second lens 220 to enter the light
  • the semi-reflective and semi-transparent film on the surface can also be vacuum-coated on the light-incident surface of the second lens 220.
  • the polarization state of the ghost beam 111 does not change after being transmitted through the semi-reflective and semi-transparent unit 240 to continue to ensure the original In some polarization states, since the first transmission direction and the second transmission direction are perpendicular to each other, it can be understood that the polarization direction of the ghost beam 111 is perpendicular to the first transmission direction, and thus the ghost beam 111 is blocked by the elimination component 300.
  • the transflective and transflective unit 240 may be an independently arranged optical element. Specifically, the transflective and transflective unit 240 is provided in the optical path between the first lens 210 and the second lens 220.
  • the imaging assembly 200 further includes a second phase compensation unit 250, the second phase compensation unit 250 is a quarter wave plate or a phase compensation film, and the second phase compensation unit 250 is disposed on the light output of the first lens 210
  • the second phase compensation unit 250 is used to change the polarization state of the light beam transmitted therein, for example, convert circularly polarized light into linearly polarized light or convert linearly polarized light into circularly polarized light.
  • the second phase compensation unit 250 The light-emitting surface of the first lens 210 is covered by optical adhesive, or it may be coated on the light-emitting surface of the first lens 210 by means of vacuum coating.
  • the second phase compensation unit 250 is an independent optical element.
  • the second phase compensation unit 250 is disposed in the optical path between the first lens 210 and the transflective unit 240.
  • the slow axis of the first phase compensation unit 400 and the slow axis of the second phase compensation unit 250 both have an angle of 45° with the first transmission direction;
  • the fast axis of the first phase compensation unit 400 and the fast axis of the second phase compensation unit 250 both have an angle of 45° with the first transmission direction.
  • the crystal axes include a fast axis and a slow axis
  • the first phase compensation unit 400 and the second The angle between the fast axis or the slow axis of the phase compensation unit 250 and the transmission direction of 45° effectively ensures the formation of left-handed or right-handed circularly polarized light
  • the first phase compensation unit 400 and the second phase compensation unit 250 are phase compensation films
  • the phase delay axis, the angle of 45° between the phase delay axis and the transmission direction effectively guarantees the formation of left-handed or right-handed circularly polarized light.
  • the display unit 100 emits a linearly polarized display beam 110 to the second polarizing unit 230, the display beam 110 propagates along the optical axis 600, and the second polarized light
  • the unit 230 is a reflective polarizing film.
  • the second polarizing unit 230 has a polarization transmission direction, and the polarization state of the display beam 110 does not change after the second polarizing unit 230 passes through the second phase compensation unit 250.
  • the linear polarization state is displayed
  • the light beam 110 is converted into left-handed circularly polarized light (it can also be right-handed circularly polarized light, taking left-handed circularly polarized light as an example, the same below), where the observation direction is facing the incident direction of the display light beam 110, and the left-handed circularly polarized display light beam
  • the transmitted display beam 110 forms a ghost beam 111
  • the transmitted ghost beam 111 maintains its polarization state and remains left-handed circularly polarized light
  • the reflected display beam 110 forms an imaging beam 112.
  • the imaging beam 112 is converted into right-handed circularly polarized light, and the right-handed circularly polarized imaging beam 112 is converted into linearly polarized light after passing through the second phase compensation unit 250.
  • the linearly polarized light is The polarization direction of the imaging light beam 112 is perpendicular to the polarization transmission direction of the second polarization unit 230.
  • the imaging light beam 112 in the linear polarization state hits the surface of the second polarization unit 230, and the reflection phenomenon occurs again.
  • the imaging light beam 112 in the linear polarization state passes through the second polarization unit again.
  • the phase compensation unit 250 it is converted into a right-handed polarized imaging light beam 112 and transmitted through the second lens 220.
  • the ghost light beam 111 and the imaging light beam 112 passing through the second lens 220 are both circularly polarized light, but their deflection states are different.
  • the direction of rotation is opposite, the left-handed circularly polarized ghost beam 111 and the right-handed circularly polarized imaging beam 112 are both directed to the first phase compensation unit 400, the polarization state is changed, and the left-handed circularly polarized ghost beam 111 is converted into
  • the imaging beam 112 of the right-handed circularly polarized light converts the linearly polarized light whose polarization direction is perpendicular to the polarization transmission direction of the second polarization unit 230, due to the first polarization.
  • the transmission direction of the unit is perpendicular to the polarization transmission direction of the second polarizing unit 230, that is, the ghost beam 111 is blocked, and the imaging beam 112 smoothly passes through the first polarizing unit to form an image at the position of the human eye 500, where the first polarizing unit It is a transmissive polarizing film.
  • the present invention also provides a head-mounted display device.
  • the head-mounted display device includes an optical imaging structure.
  • the optical imaging structure includes a display unit 100, an imaging component 200, and an elimination component 300.
  • the display unit 100 is used to emit the display light beam 110; the imaging assembly 200 is used to receive the display light beam 110 emitted by the display unit 100, and cause the display light beam 110 to propagate in the imaging assembly 200.
  • the display light beam 110 propagates in the imaging assembly 200, ghosts are generated.
  • the image beam 111; the elimination component 300 is used to receive the ghost beam 111, the elimination component 300 has a first transmission direction, the first transmission direction is different from the polarization direction of the ghost beam 111, the head mounted display device also includes a housing, optical imaging The structure is arranged in the shell.
  • the display unit 100 emits a display light beam 110, and when the display light beam 110 passes through the imaging assembly 200, a ghost image light beam 111 is generated.
  • the elimination assembly 300 has a first transmission direction. The direction can ensure the transmission of light beams with the same transmission direction and block light beams with different transmission directions. Since the polarization direction of the ghost light 111 is different from the first transmission direction, the ghost light 111 is blocked by the elimination component 300, The inability to pass through the elimination component 300 effectively prevents the ghost beam 111 from being imaged at the position of the human eye 500 and improves the user's wearing experience.

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Abstract

一种光学成像结构及头戴显示设备，其中光学成像结构包括：显示单元(100)、成像组件(200)和消除组件(300)，其中显示单元(100)用于发射显示光束(110)；成像组件(200)用于接收显示单元(100)射出的显示光束(110)，并使显示光束(110)在成像组件(200)内传播，显示光束(110)在成像组件(200)内传播时产生鬼像光束(111)；消除组件(300)用于接收鬼像光束(111)，消除组件(300)具有第一透射方向，且第一透射方向与鬼像光束(111)的偏振方向不同，能够有效消除鬼像，提高用户的佩戴体验。

Description

光学成像结构及头戴显示设备 技术领域
本发明涉及头戴显示设备技术领域，尤其涉及一种光学成像结构及头戴显示设备。
背景技术
头戴显示设备是一种能够为佩戴用人员提供身临其境体验的电子产品，因此头戴显示设备类的产品发展迅速，一般用在娱乐、军事和医学等领域中。
目前的头戴显示设备技术原理大致分为虚拟现实(Virtual Reality)简称VR，增强现实(Augmented Reality)简称AR，以及混合现实(Mixed Reality)简称MR。随着头戴显示设备类产品的快速发展，头戴显示设备逐渐朝向小型化方向发展，目前采用的小型化的技术思路是通过在头戴显示设备内部进行光路的折射、反射，让光路在一定空间内往返，由此来减少头戴显示设备的整体体积，但是目前的采用折反射光路的头戴显示设备中易产生鬼像，所述鬼像是一种光线在光学透镜的表面经过反射或透射形成的附加像，一般鬼像成像在光学系统的焦面附近生成，由此导致佩戴头戴显示设备的用户观察到鬼像，鬼像和标准的影像共存且部分重叠，降低了用户在佩戴使用过程的感官体验。
发明内容
基于此，针对目前头戴显示设备中的折反射光路中存在鬼像的问题，有必要提供一种光学成像结构及头戴显示设备，能够有效消除鬼像。
为实现上述目的，本发明提出的光学成像结构，包括：
显示单元，所述显示单元用于发射显示光束；
成像组件，用于接收所述显示单元射出的所述显示光束，并使所述显示光束在所述成像组件内传播，所述显示光束在所述成像组件内传播时产生鬼像光束；
消除组件，用于接收所述鬼像光束，所述消除组件具有第一透射方向，且所述第一透射方向与所述鬼像光束的偏振方向不同。
可选地，所述消除组件包括第一偏光单元，所述第一偏光单元具有所述第一透射方向，所述第一透射方向和所述鬼像光束的偏振方向相互垂直。
可选地，所述光学成像结构还包括第一相位补偿单元，所述第一相位补偿单元设置于所述成像组件和所述消除组件之间的光路中，所述第一相位补偿单元用于使所述鬼像光束转换为线偏振光。
可选地，所述光学成像结构还包括第一相位补偿单元，所述第一相位补偿单元设置于所述成像组件的出光面，或所述第一相位补偿单元设置于所述消除组件的入光面，所述第一相位补偿单元用于使所述鬼像光束转换为线偏振光。
可选地，所述第一相位补偿单元为四分之一波片或相位补偿膜。
可选地，所述成像组件包括沿所述显示光束传播方向依次设置的第一透镜和第二透镜，所述第一透镜的入光面设置有第二偏光单元，所述第二偏光单元具有第二透射方向，所述第二透射方向与所述显示光束偏振方向相同。
可选地，所述成像组件还包括设置于所述第二透镜入光面的半反半透单元，所述显示光束经过所述半反半透单元形成反射的成像光束和透射的所述鬼像光束，其中所述第一透射方向和所述第二透射方向相互垂直。
可选地，所述成像组件还包括第二相位补偿单元，所述第二相位补偿单元为四分之一波片或相位补偿膜，所述第二相位补偿单元设置于所述第一透镜的出光面。
可选地，当所述第二相位补偿单元为四分之一波片时，
所述第一相位补偿单元的慢轴和所述第二相位补偿单元的慢轴均与所述第一透射方向夹角为45°；
或，所述第一相位补偿单元的快轴和所述第二相位补偿单元的快轴均与所述第一透射方向夹角为45°。
为了实现上述目的，本发明还提供一种头戴显示设备，包括上文所述的光学成像结构，所述头戴显示设备还包括外壳，所述光学成像结构设置于所述外壳内。
本发明提出的技术方案中，显示单元发射显示光束，显示光束经过在成像组件内传播时产生鬼像光束，消除组件中设置有第一透射方向，第一透射方向能够保证与其透射方向相同的光束透过，并遮挡与其透射方向不同的光束，由于鬼像光束的偏振方向和第一透射方向不同，因此鬼像光束被所述消除组件阻挡，无法穿过所述消除组件，有效避免鬼像光束在人眼位置成像，提高用户的佩戴体验。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本发明光学成像结构的一实施例的结构示意图；
图2为图1中本发明光学成像结构的鬼像光束传播路径的示意图；
图3为图1中本发明光学成像结构中显示光束经传播路径的示意图；
图4为本发明光学成像结构中成像光束和鬼像光束传播方向示意图；。
附图标号说明：
标号 名称 标号 名称
100 显示单元 230 第二偏光单元
110 显示光束 240 半反半透单元
111 鬼像光束 250 第二相位补偿单元
112 成像光束 300 消除组件
200 成像组件 400 第一相位补偿单元
210 第一透镜 500 人眼
220 第二透镜 600 光轴
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明，本发明实施例中所有方向性指示(诸如上、下、左、右、前、后……)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本发明中如涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“连接”、“固定”等应做广义理解，例如，“固定”可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
另外，本发明各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
请参阅图1所示，本发明提出的光学成像结构，包括：显示单元100、成像组件200和消除组件300。
其中显示单元100用于发射显示光束110；成像组件200用于接收显示单元100射出的显示光束110，并使显示光束110在成像组件200内传播，显示光束110在成像组件200内传播时产生鬼像光束111；消除组件300用于接收鬼像光束111， 消除组件300设置有第一透射方向(图未示)，且第一透射方向与鬼像光束111的偏振方向不同。
本发明提出的技术方案中，显示单元100发射显示光束110，显示光束110经过在成像组件200内传播时产生鬼像光束111，消除组件300中设置有第一透射方向，第一透射方向能够保证与其透射方向相同的光束透过，并遮挡与其透射方向不同的光束，由于鬼像光束111的偏振方向和第一透射方向不同因此鬼像光束111被所述消除组件300阻挡，无法穿过所述消除组件300，有效避免鬼像光束111在人眼500位置成像，提高用户的佩戴体验。
进一步地，消除组件300包括第一偏光单元(图未示)，第一偏光单元具有第一透射方向，第一透射方向和鬼像光束111的偏振方向相互垂直，具体地，第一透射方向能够保证与其透射方向相同的光束透过，光束顺第一透射方向透过时，透过光束的偏振方向和第一透射方向夹角为0°，由于第一透射方向和鬼像光束111的偏振方向垂直，由此可知第一透射方向和鬼像光束111的偏振方向夹角90°，也就是说第一透射方向和鬼像光束111的偏振方向夹角处于最大值，如此能够进一步有效阻挡鬼像光束111。
进一步地，光学成像结构还包括第一相位补偿单元400，第一相位补偿单元400设置于成像组件200和消除组件300之间的光路中，第一相位补偿单元400用于使鬼像光束111转换为线偏振光，由于圆偏振光或椭圆偏振光的偏振方向右旋或者左旋，消除组件300对鬼像光束111的消除效果不佳，通过第一相位补偿单元400将鬼像光束111转换为线偏振光，线偏振光状态的鬼像光束111偏振方向单一，以便于消除组件300阻挡鬼像光束111透射，提高消除组件300对鬼像光束111的消除效果。
作为一种优选实施方式，光学成像结构还包括第一相位补偿单元400，第一相位补偿单元400设置于成像组件200的出光面，或第一相位补偿单元400设置于消除组件300的入光面，第一相位补偿单元400用于使鬼像光束111转换为线偏振光，具体地，第一相位补偿单元400通过光学胶贴覆在成像组件200的出光面上，或者通过真空镀膜的方式将第一相位补偿单元400镀制在成像组件200的出光面上，第一相位补偿单元400通过光学胶贴覆在消除组件300的入光面上，或者通过真空镀膜的方式将第一相位补偿单元400镀制在消除组件300的入光面上。
作为另一种实施方式，第一相位补偿单元400为四分之一波片或相位补偿膜，第一相位补偿单元400有效保证通过的线偏振光转换为圆偏振光，或者将圆偏振光转换为线偏振光。
作为一种优选方式，成像组件200包括沿显示光束110传播方向依次设置的第一透镜210和第二透镜220，第一透镜210和第二透镜220为平凸透镜、凹凸透镜或双凸透镜其中任意一种，第一透镜210和第二透镜220用于成像显示，其中第一透镜210的入光面设置有第二偏光单元230，第二偏光单元230具有第二透射方向(图未示)，第二透射方向和显示光束110的偏振方向相同，具体地，显示光束110的偏振状态为线偏振状态，通过第二透射方向具有和显示光束110偏振方向相同的透过方向，能够有效保证线偏振状态的显示光束110透过，射入成像组件200内，其中第二偏光单元230为贴覆在第一透镜210的入光面或镀制在第一透镜210的入光面的膜层。
进一步地，参阅图2所示，成像组件200还包括设置于第二透镜220入光面的半反半透单元240，显示光束110经过半反半透单元240形成反射的成像光束112和透射的鬼像光束111，其中第一透射方向和第二透射方向相互垂直，具体地，半反半透单元240为半反半透膜，半反半透单元240为贴覆在第二透镜220入光面的半反半透膜，也可以为真空镀膜的方式镀制在第二透镜220的入光面上，鬼像光束111在透射半反半透单元240后偏振状态不发生变化，继续保证原有的偏振状态，由于第一透射方向和第二透射方向相互垂直，可以理解的是，鬼像光束111的偏振方向和第一透射方向垂直，由此鬼像光束111被消除组件300阻挡。
除此之外，半反半透单元240可为独立设置的光学元件，具体地，半反半透单元240设置于第一透镜210至第二透镜220之间的光路中。
作为一种优选方式，成像组件200还包括第二相位补偿单元250，第二相位补偿单元250为四分之一波片或相位补偿膜，第二相位补偿单元250设置于第一透镜210的出光面，第二相位补偿单元250用于将改变透射其中的光束的偏振状态，例如将圆偏振光转换为线偏振光或者将线偏振光转换为圆偏振光，具体地，第二相位补偿单元250通过光学胶贴覆在第一透镜210出光面，也可以为采用真空镀膜的方式镀制在第一透镜210的出光面上。
同样地，第二相位补偿单元250为独立存在的光学元件，例如第二相位补 偿单元250设置于第一透镜210至半反半透单元240之间的光路中。
进一步地，当第二相位补偿单元250为四分之一波片时，第一相位补偿单元400的慢轴和第二相位补偿单元250的慢轴均与第一透射方向夹角为45°；
或，第一相位补偿单元400的快轴和第二相位补偿单元250的快轴均与第一透射方向夹角为45°。
具体地，当第一相位补偿单元400和第二相位补偿单元250为四分之一波片时均具有晶轴，所述晶轴包括快轴和慢轴，第一相位补偿单元400和第二相位补偿单元250的快轴或慢轴与透射方向夹角45°有效保证形成左旋或右旋圆偏振光；此外，当第一相位补偿单元400和第二相位补偿单元250为相位补偿膜时具有相位延迟轴，该相位延迟轴与透射方向夹角45°有效保证形成左旋或右旋圆偏振光。
参阅图3和图4所示，通过上文所述的技术方案可知，显示单元100发射线偏振状态的显示光束110至第二偏光单元230，显示光束110沿光轴600方向传播，第二偏光单元230为反射式偏光膜，第二偏光单元230具有一偏振透射方向，显示光束110透射所述第二偏光单元230后偏振状态不变，经过第二相位补偿单元250后，线偏振状态的显示光束110转换为左旋圆偏振光(也可为右旋圆偏振光，以左旋圆偏振光为例，下同)，其中的观察方向为面向显示光束110的入射方向，左旋圆偏振状态的显示光束110在经过半反半透单元240时，发生反射和透射，透射的显示光束110形成鬼像光束111，透射的鬼像光束111保持偏振状态不变，依然是左旋圆偏振光；反射的显示光束110形成成像光束112，经过反射后，成像光束112转换为右旋圆偏振光，右旋圆偏振光的成像光束112经过第二相位补偿单元250后转换为线偏振光，此时线偏振状态的成像光束112的偏振方向垂直于第二偏光单元230的偏振透射方向，线偏振状态的成像光束112射到第二偏光单元230表面，再次发生反射现象，线偏振状态的成像光束112再次经过第二相位补偿单元250后，转换为右旋偏振光的成像光束112，透射第二透镜220，由此可知经过第二透镜220的鬼像光束111和成像光束112都是圆偏振光，但是偏转状态不同，旋向相反，左旋圆偏振光的鬼像光束111和右旋圆偏振光的成像光束112均射向第一相位补偿单元400，偏振状态发生改变，左旋圆偏振光的鬼像光束111转换为偏振方向和第二偏光单元230的偏振透射方向相同的线偏振光，右旋圆偏振光的成像光束112转换偏振 方向和第二偏光单元230的偏振透射方向垂直的线偏振光，由于第一偏光单元的透射方向和第二偏光单元230的偏振透射方向垂直，也就是说鬼像光束111被遮挡，而成像光束112顺利透过第一偏光单元，在人眼500位置成像，其中第一偏光单元为透射式偏光膜。
本发明还提供一种头戴显示设备，头戴显示设备包括光学成像结构，光学成像结构包括显示单元100、成像组件200和消除组件300。
显示单元100用于发射显示光束110；成像组件200用于接收显示单元100射出的显示光束110，且并使显示光束110在成像组件200内传播，显示光束110在成像组件200内传播时产生鬼像光束111；消除组件300用于接收鬼像光束111，消除组件300具有第一透射方向，第一透射方向与鬼像光束111的偏振方向不同，所述头戴显示设备还包括外壳，光学成像结构设置于外壳内。
本发明提出的头戴显示设备的技术方案中，显示单元100发射显示光束110，显示光束110经过在成像组件200内传播时产生鬼像光束111，消除组件300具有第一透射方向，第一透射方向能够保证与其透射方向相同的光束透过，并遮挡与其透射方向不同的光束，由于鬼像光111的偏振方向和第一透射方向不同，由此鬼像光束111被所述消除组件300阻挡，无法穿过所述消除组件300，有效避免鬼像光束111在人眼500位置成像，提高用户的佩戴体验。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (10)

  1. 一种光学成像结构，其特征在于，包括：
    显示单元，所述显示单元用于发射显示光束；
    成像组件，用于接收所述显示单元射出的所述显示光束，并使所述显示光束在所述成像组件内传播，所述显示光束在所述成像组件内传播时产生鬼像光束；
    消除组件，用于接收所述鬼像光束，所述消除组件具有第一透射方向，且所述第一透射方向与所述鬼像光束的偏振方向不同。
  2. 如权利要求1所述的光学成像结构，其特征在于，所述消除组件包括第一偏光单元，所述第一偏光单元具有所述第一透射方向，所述第一透射方向和所述鬼像光束的偏振方向相互垂直。
  3. 如权利要求2所述的光学成像结构，其特征在于，所述光学成像结构还包括第一相位补偿单元，所述第一相位补偿单元设置于所述成像组件和所述消除组件之间的光路中，所述第一相位补偿单元用于使所述鬼像光束转换为线偏振光。
  4. 如权利要求2所述的光学成像结构，其特征在于，所述光学成像结构还包括第一相位补偿单元，所述第一相位补偿单元设置于所述成像组件的出光面，或所述第一相位补偿单元设置于所述消除组件的入光面，所述第一相位补偿单元用于使所述鬼像光束转换为线偏振光。
  5. 如权利要求3或4所述的光学成像结构，其特征在于，所述第一相位补偿单元为四分之一波片或相位补偿膜。
  6. 如权利要求5所述的光学成像结构，其特征在于，所述成像组件包括沿所述显示光束传播方向依次设置的第一透镜和第二透镜，所述第一透镜的入光面设置有第二偏光单元，所述第二偏光单元具有第二透射方向，所述第 二透射方向与所述显示光束偏振方向相同。
  7. 如权利要求6所述的光学成像结构，其特征在于，所述成像组件还包括设置于所述第二透镜入光面的半反半透单元，所述显示光束经过所述半反半透单元形成反射的成像光束和透射的所述鬼像光束，其中所述第一透射方向和所述第二透射方向相互垂直。
  8. 如权利要求7所述的光学成像结构，其特征在于，所述成像组件还包括第二相位补偿单元，所述第二相位补偿单元为四分之一波片或相位补偿膜，所述第二相位补偿单元设置于所述第一透镜的出光面。
  9. 如权利要求8所述的光学成像结构，其特征在于，当所述第二相位补偿单元为四分之一波片时，
    所述第一相位补偿单元的慢轴和所述第二相位补偿单元的慢轴均与所述第一透射方向夹角为45°；
    或，所述第一相位补偿单元的快轴和所述第二相位补偿单元的快轴均与所述第一透射方向夹角为45°。
  10. 一种头戴显示设备，其特征在于，包括权利要求1-9任一所述的光学成像结构，所述头戴显示设备还包括外壳，所述光学成像结构设置于所述外壳内。
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