WO2018045816A1 - 全息显示装置及其显示方法 - Google Patents

全息显示装置及其显示方法 Download PDF

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Publication number
WO2018045816A1
WO2018045816A1 PCT/CN2017/092378 CN2017092378W WO2018045816A1 WO 2018045816 A1 WO2018045816 A1 WO 2018045816A1 CN 2017092378 W CN2017092378 W CN 2017092378W WO 2018045816 A1 WO2018045816 A1 WO 2018045816A1
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Prior art keywords
display device
phase
modulation
phase control
holographic display
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PCT/CN2017/092378
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English (en)
French (fr)
Inventor
谷新
董学
关峰
谭纪风
王美丽
王维
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京东方科技集团股份有限公司
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Priority to US15/744,756 priority Critical patent/US20180314207A1/en
Publication of WO2018045816A1 publication Critical patent/WO2018045816A1/zh

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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2286Particular reconstruction light ; Beam properties
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22Processes or apparatus for obtaining an optical image from holograms
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02Details of features involved during the holographic process; Replication of holograms without interference recording
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04Processes or apparatus for producing holograms
    • G03H1/10Processes or apparatus for producing holograms using modulated reference beam
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2294Addressing the hologram to an active spatial light modulator
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H2001/0208Individual components other than the hologram
    • G03H2001/0224Active addressable light modulator, i.e. Spatial Light Modulator [SLM]
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00Light sources or light beam properties
    • G03H2222/20Coherence of the light source
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00Light sources or light beam properties
    • G03H2222/50Geometrical property of the irradiating beam
    • G03H2222/53Collimated beam
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00Optical components
    • G03H2223/13Phase mask
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00Active addressable light modulator
    • G03H2225/20Nature, e.g. e-beam addressed
    • G03H2225/22Electrically addressed SLM [EA-SLM]
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00Active addressable light modulator
    • G03H2225/30Modulation
    • G03H2225/31Amplitude only
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00Active addressable light modulator
    • G03H2225/30Modulation
    • G03H2225/33Complex modulation
    • G03H2225/34Amplitude and phase coupled modulation
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2225/00Active addressable light modulator
    • G03H2225/55Having optical element registered to each pixel
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2240/00Hologram nature or properties
    • G03H2240/10Physical parameter modulated by the hologram
    • G03H2240/13Amplitude and phase complex modulation

Definitions

  • the present invention relates to the field of three-dimensional display technologies, and in particular, to a holographic display device and a display method thereof.
  • 3D display is of great significance in today's social life, and holographic display will be the most promising technology for real 3D display.
  • Holographic display can provide all the information of object wave, with excellent depth and parallax, can provide human All physiological and psychological implications of 3D information.
  • a method of recording and reproducing a wave of matter using light wave interference and diffraction characteristics is called holography. Since the phase and amplitude information of the object image is recorded, the 3D image of the object image can be reproduced.
  • the existing holographic display system uses a spatial or optically addressed spatial modulator to simultaneously modulate the phase and amplitude of the light, requiring a spatial modulator with a high refresh rate and a fast response speed, which is difficult to satisfy. Therefore, there are problems such as large crosstalk, low resolution, and easy visual fatigue, which is not conducive to obtaining an optimal three-dimensional viewing effect.
  • embodiments of the present invention provide a holographic display device and a display method thereof for at least partially alleviating the problem that a conventional three-dimensional viewing effect is poor when a spatial modulator implements holographic display.
  • Embodiments of the present invention provide a holographic display device including: a backlight for providing coherent reference light, an optical switching device for modulating optical wave amplitude information of the coherent reference light, and for modulating the coherent reference light a phase control board of the light wave phase information; wherein the phase control board and the optical switching device are disposed on a light exiting side of the backlight.
  • the phase control board is disposed between the backlight and the optical switching device; or the phase control board is disposed on a light exiting side of the optical switching device.
  • the phase control board includes a plurality of mutually independent modulation regions; one of the modulation regions is in one-to-one correspondence with one of the optical switching devices, or in the modulation region One of the ones corresponds to a plurality of pixel regions in the optical switching device.
  • two adjacent modulation regions modulate the phase modulation angles of the coherent reference beams to be different from each other.
  • each of the modulation regions modulates a phase modulation angle of the coherent reference light to be fixed.
  • each of the modulation regions modulating a phase modulation angle of the coherent reference light can be varied according to a received amplitude modulation signal.
  • the phase control board is a grating phase control board, a light layer thickness phase control board, or a liquid crystal phase control board.
  • the optical switching device is a liquid crystal display device, an electrochromic device, or a photochromic device.
  • the coherent reference light provided by the backlight is coherent collimated light.
  • an embodiment of the present invention provides a display method of the above holographic display device, including:
  • the backlight provides coherent reference light
  • the phase control board modulates light wave phase information of the coherent reference light
  • the optical switching device modulates light wave amplitude information of the coherent reference light according to the received modulation signal.
  • FIG. 1 is a schematic structural diagram of a holographic display device according to an embodiment of the present invention.
  • FIG. 2 is a second schematic structural diagram of a holographic display device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a holographic display device according to an embodiment of the present invention.
  • each modulation region of a phase control plate corresponds to a plurality of pixel regions, in accordance with an embodiment of the present invention
  • FIG. 5 shows a schematic structure of a holographic display device in which each modulation region of a phase control plate corresponds to one pixel region, in accordance with an embodiment of the present invention
  • FIG. 6 shows an example of a phase control panel of a holographic display device in accordance with an embodiment of the present invention
  • FIG. 7 illustrates another example of a phase control panel of a holographic display device according to an embodiment of the present invention.
  • FIG. 8 illustrates still another example of a phase control panel of a holographic display device according to an embodiment of the present invention
  • FIG. 9 is a flow chart showing a display method of a holographic display device according to an embodiment of the present invention.
  • an embodiment of the present invention provides a holographic display device including: a backlight for providing coherent reference light, and an optical switching device for modulating light wave amplitude information of the coherent reference light, And a phase control board for modulating optical wave phase information of the coherent reference light; wherein the phase control board and the optical switching device are disposed on a light exiting side of the backlight.
  • An embodiment of the present invention provides a holographic display device, as shown in FIGS. 1 and 2, comprising: a backlight 100 for providing coherent reference light, and an optical switching device 200 for modulating light wave amplitude information of the coherent reference light, And a phase control board 300 for modulating optical wave phase information of the coherent reference light; wherein the phase control board 300 and the optical switching device 200 are disposed on the light outgoing side of the backlight 100.
  • the phase modulation and the amplitude modulation are separately provided, the optical wave phase information and the optical wave amplitude information are independently controlled, and the optical switching device 200 is used to modulate the optical wave amplitude information, and the phase is utilized.
  • the control board 300 modulates the phase information of the light wave, which is advantageous for improving the control ability of the modulation object and realizing high quality holographic display.
  • the phase control board 300 can be used to modulate the optical wave phase information, and the three-dimensional display of the naked eye with multiple viewing angles can be realized.
  • the phase control board 300 and the optical switching device 200 are both disposed on the light emitting side of the backlight 100, specifically, the phase control board 300 can be as shown in FIG. As shown in FIG. 1 , the phase control board 300 is disposed on the light exiting side of the optical switching device 200 , that is, the optical switching device 200 is disposed on the backlight 100 and the phase control. There is no limitation between the plates 300.
  • the backlight 100 for providing coherent reference light may be an OLED backlight, may be an LED backlight, or may be a dynamic backlight. , not limited here.
  • the coherent reference light provided by the backlight 100 is preferably coherent collimated light, that is, the backlight 100 is preferably Straight backlight.
  • the optical switching device 200 for modulating the optical wave amplitude information of the coherent reference light may be implemented in various manners, for example, a liquid crystal display device or an electrochromic layer may be used.
  • a device or a photochromic device may also be a device that modulates light wave amplitude information based on a received modulated signal using a microelectromechanical system (MEMS) device or the like.
  • MEMS microelectromechanical system
  • the optical switching device 200 when the optical switching device 200 is an electrochromic device, as shown in FIG. 3, the optical switching device 200 specifically includes: an upper substrate 210 and an opposite substrate a lower substrate 220, and an electrochromic material layer 230 disposed between the upper substrate 210 and the lower substrate 220, and further, may further include an electrolyte layer 240; and, the electrolyte layer 240 may be electro-electric as shown in FIG. Color changing material layer
  • the side of the lower substrate 220 may be located on the side of the lower substrate 220, which is not limited thereto.
  • the optical switching device 200 selects other devices such as a liquid crystal display device or a photochromic device
  • the structure of the electrochromic device is similar, and details are not described herein.
  • the phase control board 300 in order to realize the modulation of the optical wave phase information, in the above holographic display device provided by the embodiment of the present invention, the phase control board 300 generally includes a plurality of mutually independent modulation regions; and, a modulation region and the optical switch One pixel area of the device 200 corresponds to one another; or a modulation area may correspond to a plurality of pixel areas in the optical switching device 200, which is not limited herein.
  • each modulation region of the phase control board 300 corresponds to a plurality of pixel regions in the optical switching device 200, respectively.
  • the first modulation area 310 corresponds to three pixel areas 410, 420, 430
  • the second modulation area 320 corresponds to two pixel areas 440, 450.
  • each modulation area of the phase control board 300 corresponds to one pixel area in the optical switching device 200, respectively.
  • the first modulation area 310 corresponds to one pixel area 430
  • the second modulation area 320 corresponds to one pixel area 440.
  • the modulation region corresponds to one or more pixel regions, meaning that the modulation region is arranged to phase modulate the outgoing light of the one or more pixel regions.
  • one modulation region can be aligned with one or more pixel regions.
  • the phase modulation angles of the modulated light rays of the adjacent two modulation regions in the phase control panel 300 are generally different from each other, and the adjustment capability of the phase modulation angle is generally controlled at 0. -2 ⁇ , that is, the phase adjustment angle range is selected within 0-2 ⁇ .
  • the holographic display in order to realize the display of the dynamic holographic image, in the holographic display device provided by the embodiment of the present invention, can be realized by the following three methods: First, the modulated optical wave amplitude information is dynamically changed. The phase modulation angle of the phase information of the modulated light wave is relatively fixed. Secondly, the amplitude information of the modulated light wave is dynamically changed, and the phase modulation angle of the phase information of the modulated light wave is also dynamically changed according to the change of the viewing angle. Third, the amplitude of the modulated light wave is modulated. The information is relatively fixed, and the dynamic holographic display is realized by modulating the phase modulation angle of the phase information of the light wave.
  • the phase modulation angle of the modulated light of each modulation region in the phase control panel 300 may be fixed, or may be based on the received control signal (for example, an amplitude modulated signal). ) and dynamically change.
  • the implementation manner of the specific phase control board 300 can be selected according to whether the phase modulation angle is dynamically adjusted according to whether each modulation region in the phase control board 300 is required, for example, in fixed phase control.
  • the phase control panel 300 can select a grating phase control panel, a light layer thickness phase control panel, or a liquid crystal phase control panel.
  • the phase control panel 300 can select the liquid crystal phase control panel.
  • the grating phase control board refers to a nano-grating with different grating periods in each modulation area of the phase control board 300, so as to realize different degrees of phase angle modulation on the optical wave phase information of the passing light.
  • the first nano-grating 330 and the second nano-grating 340 having different grating periods are respectively disposed in the first modulation area 310 and the second modulation area 320, which can be realized. Different degrees of phase angle modulation are performed on the optical wave phase information of the light passing through the first modulation area 310 and the second modulation area 320.
  • the optical layer thickness phase control plate refers to a film stack having different thicknesses in each modulation region of the phase control plate 300 to achieve different degrees of phase angle modulation for the light wave phase information of the passing light.
  • the film thicknesses in the first modulation area 310 and the second modulation area 320 are different, which can also be achieved for passing the first modulation area 310 and the second modulation area.
  • the light wave phase information of the light of 320 performs different degrees of phase angle modulation.
  • the liquid crystal phase control board refers to an independent controllable liquid crystal cell in each modulation area of the phase control board 300. By controlling the rotation angle of the liquid crystal molecules in the liquid crystal cell, different phase angles are realized for the light wave phase information of the passing light.
  • a liquid crystal cell 350 is disposed in a modulation area such as the first modulation area 310 and the second modulation area 320, by controlling the rotation angle of liquid crystal molecules in the liquid crystal cell.
  • the phase information of the light wave passing through the light of each modulation region can be subjected to different degrees of phase angle modulation.
  • the optical switching device 200 is not shown. This is merely exemplary.
  • an embodiment of the present invention further provides a display method of a holographic display device. Since the principle of solving the problem is similar to the foregoing holographic display device, the implementation of the display method can be referred to the holographic display device. Implementation, repetition will not be repeated.
  • a display method of a holographic display device provided by an embodiment of the present invention, as shown in FIG. 9, includes the following steps:
  • the backlight provides coherent reference light
  • the phase control board modulates light wave phase information of the coherent reference light
  • the optical switching device modulates the optical wave amplitude information of the coherent reference light according to the received modulation signal to implement dynamic holographic display.
  • the signal source may perform separation of the amplitude information and the phase information according to the holographic image information to be displayed, and then load the modulation information into the modulation signal and send it to the optical switching device for regulation, and may also be based on the phase information.
  • the phase control board performs regulation, or the phase control board of the fixed modulation is used to modulate the phase information of the light wave; the amplitude information of the light wave is modulated by the optical switching device, and the phase information of the light wave is modulated by the phase control board, so that the holographic image can be reproduced.
  • the holographic display device and the display method thereof provided by the embodiments of the present invention include: a backlight for providing coherent reference light, an optical switching device for modulating optical wave amplitude information of the coherent reference light, and a modulation reference light for modulating the coherent reference light a phase control board for light wave phase information; wherein the phase control board and the optical switching device are disposed in the backlight The light side. Since the phase modulation and the amplitude modulation are separately set, the optical wave phase information and the optical wave amplitude information are independently controlled, the optical wave amplitude information is modulated by the optical switching device, and the phase control board is used to modulate the optical wave phase information, which is advantageous for improving the modulation target. Controlling ability to achieve high quality holographic display. Moreover, the phase control board can be used to modulate the optical wave phase information, and the three-dimensional display of the naked eye with multiple viewing angles can be realized.

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

一种全息显示装置及其显示方法,该全息显示装置包括:用于提供相干参考光的背光源(100),用于调制相干参考光的光波振幅信息的光开关器件(200),以及用于调制相干参考光的光波相位信息的相位控制板(300);其中,相位控制板(300)和光开关器件(200)设置于背光源(100)的出光侧。

Description

全息显示装置及其显示方法
交叉引用
本申请要求于2016年9月8日递交中国专利局的、申请号为201610811510.6的中国专利申请的权益,该申请的全部内容以引用方式并入本文。
技术领域
本发明涉及三维显示技术领域,尤其涉及一种全息显示装置及其显示方法。
背景技术
显示以视觉的形式将信息传递给人们,在人们的现实生活中具有重要的意义。据科学家估计人类得到的70%到80%的信息来源于视觉。
3D显示在现在社会生活中具有重要的意义,而全息显示将会是最有希望实现真3D显示的技术,全息显示可以提供物体波的全部信息,具有极好的深度与视差,可以提供人类对3D信息所需要的所有生理和心理暗示。
利用光波干涉和衍射特性来记录和重现物波的方法称为全息术(holography)。由于记录了物像的相位与振幅信息,因此可以重现物像的3D图像。现有的全息显示系统采用光或电寻址的空间调制器同时对光的相位和振幅进行调制,要求空间调制器具有高的刷新频率,快的响应速度,很难满足。因此,会出现串扰大,分辨率低,容易视觉疲劳等问题,不利于获得最佳的三维观看效果。
发明内容
有鉴于此,本发明实施例提供了一种全息显示装置及其显示方法,用以至少部分地缓解现有空间调制器实现全息显示时三维观看效果差的问题。
本发明实施例提供了一种全息显示装置,包括:用于提供相干参考光的背光源,用于调制所述相干参考光的光波振幅信息的光开关器件,以及用于调制所述相干参考光的光波相位信息的相位控制板;其中,所述相位控制板和所述光开关器件设置于所述背光源的出光侧。
在一种实施例中,所述相位控制板设置于所述背光源与所述光开关器件之间;或,所述相位控制板设置于所述光开关器件的出光侧。
在一种实施例中,所述相位控制板包括多个相互独立的调制区域;所述调制区域中的一个与所述光开关器件中的一个像素区域一一对应,或,所述调制区域中的一个与所述光开关器件中的多个像素区域对应。
在一种实施例中,相邻的两个所述调制区域调制所述相干参考光的相位调制角度互不相同。
在一种实施例中,各所述调制区域调制所述相干参考光的相位调制角度是固定的。
在一种实施例中,各所述调制区域调制所述相干参考光的相位调制角度能够根据接收的振幅调制信号变化。
在一种实施例中,所述相位控制板为光栅相位控制板、光层厚度相位控制板、或液晶相位控制板。
在一种实施例中,所述光开关器件为液晶显示器件,电致变色器件,或光致变色器件。
在一种实施例中,所述背光源提供的相干参考光为相干准直光。
另一方面,本发明实施例还提供了一种上述全息显示装置的显示方法,包括:
背光源提供相干参考光;
相位控制板调制所述相干参考光的光波相位信息;
光开关器件根据接收到的调制信号调制所述相干参考光的光波振幅信息。
附图说明
图1为本发明实施例提供的全息显示装置的结构示意图之一;
图2为本发明实施例提供的全息显示装置的结构示意图之二;
图3为本发明实施例提供的全息显示装置的具体结构示意图;
图4示出了根据本发明一实施例的全息显示装置的示意性结构,其中相位控制板的每个调制区域与多个像素区域对应;
图5示出了根据本发明一实施例的全息显示装置的示意性结构,其中相位控制板的每个调制区域与一个像素区域对应;
图6示出了根据本发明一实施例的全息显示装置的相位控制板的一种示例;
图7示出了根据本发明一实施例的全息显示装置的相位控制板的另一种示例
图8示出了根据本发明一实施例的全息显示装置的相位控制板的再一种示例;以及
图9示出了根据本发明一实施例的全息显示装置的显示方法的流程图。
具体实施方式
下面结合附图,对本发明实施例提供的全息显示装置及其显示方法的具体实施方式进行详细地说明。
附图中各部件的形状和大小不反映全息显示装置的真实比例,目的只是示意说明本发明内容。
根据一种总体上的发明构思,本发明的实施例提供一种全息显示装置,包括:用于提供相干参考光的背光源,用于调制所述相干参考光的光波振幅信息的光开关器件,以及用于调制所述相干参考光的光波相位信息的相位控制板;其中,所述相位控制板和所述光开关器件设置于所述背光源的出光侧。
另外,在下面的详细描述中,为便于解释,阐述了许多具体的细节以提供对本披露实施例的全面理解。然而明显地,一个或更多个实施例在没有这些具体细节的情况下也可以被实施。在其他情况下,公知的结构和装置以图示的方式体现以简化附图。
本发明实施例提供了一种全息显示装置,如图1和图2所示,包括:用于提供相干参考光的背光源100,用于调制相干参考光的光波振幅信息的光开关器件200,以及用于调制相干参考光的光波相位信息的相位控制板300;其中,相位控制板300和光开关器件200设置于背光源100的出光侧。
具体地,本发明实施例提供的上述全息显示装置中,由于将相位调制和振幅调制分开设置,实现独立控制光波相位信息和光波振幅信息,利用光开关器件200进行光波振幅信息的调制,利用相位控制板300进行光波相位信息的调制,有利于提高对调制对象的控制能力,实现高质量的全息显示。并且,可以采用相位控制板300调制光波相位信息,可以实现多视角的裸眼三维显示。
在具体实施时,本发明实施例提供的上述全息显示装置中,由于相位控制板300和光开关器件200均设置于背光源100的出光侧,因此,具体地,相位控制板300可以如图2所示,设置于背光源100与光开关器件200之间;也可以如图1所示,相位控制板300设置于光开关器件200的出光侧,即光开关器件200设置于背光源100与相位控制板300之间,在此不作限定。
具体地,在本发明实施例提供的上述全息显示装置中,用于提供相干参考光的背光源100,在具体实施时可以采用OLED背光源,可以采用LED背光源等,还可以采用动态背光源,在此不做限定。并且,作为示例,为了利于相干参考光产生干涉和衍射,在本发明实施例提供的上述全息显示装置中,背光源100提供的相干参考光优选为相干准直光,即背光源100优选为准直背光源。
具体地,在本发明实施例提供的上述全息显示装置中,用于调制相干参考光的光波振幅信息的光开关器件200的实现方式可以有多种,例如:可以采用液晶显示器件、电致变色器件或光致变色器件,还可以采用微型机电系统(MEMS)器件等,根据接收到的调制信号对光波振幅信息进行调制的器件。
具体地,在本发明实施例提供的上述全息显示装置中,当光开关器件200为电致变色器件时,如图3所示,该光开关器件200具体包括:相对而置的上基板210和下基板220,以及设置于上基板210和下基板220之间的电致变色材料层230,进一步地,还可以包括电解液层240;并且,电解液层240可以如图3所示位于电致变色材料层 230靠近下基板220的一侧,也可以位于电致变色材料层230靠近上基板210的一侧,在此不作限定。
具体地,在本发明实施例提供的上述全息显示装置中,当光开关器件200选用液晶显示器件或光致变色器件等其他器件时,与电致变色器件的结构类似,在此不作赘述。
在具体实施时,为了实现对于光波相位信息的调制,在本发明实施例提供的上述全息显示装置中,相位控制板300一般包括多个相互独立的调制区域;并且,一个调制区域可以与光开关器件200中的一个像素区域一一对应;或者,一个调制区域也可以与光开关器件200中的多个像素区域对应,在此不做限定。
作为示例,在图4所示的结构中,相位控制板300的每个调制区域分别与光开关器件200中的多个像素区域对应。例如第一调制区域310与三个像素区域410、420、430对应,第二调制区域320与两个像素区域440、450对应。而在图5所示的结构中,相位控制板300的每个调制区域分别与光开关器件200中的一个像素区域对应。例如第一调制区域310与一个像素区域430对应,第二调制区域320与一个像素区域440对应。调制区域与一个或多个像素区域对应,是指该调制区域被设置成对于该一个或多个像素区域的出射光进行相位调制。作为示例,一个调制区域可以与一个或多个像素区域对准。
并且,在本发明实施例提供上述全息显示装置中,在相位控制板300中的相邻的两个调制区域调制光线的相位调制角度一般互不相同,且相位调制角度的调节能力一般控制在0-2π,即相位调节角度范围在0-2π内选取。
在具体实施时,为了实现动态全息图像的显示,在本发明实施例提供的上述全息显示装置中,具体可以通过下述三种方式实现全息显示:第一种,调制光波振幅信息进行动态变化,而调制光波相位信息的相位调制角度相对固定;第二种,调制光波振幅信息进行动态变化,且调制光波相位信息的相位调制角度也根据观看角度的变化而动态变化;第三种,调制光波振幅信息相对固定,通过调制光波相位信息的相位调制角度实现动态全息显示。基于此,在本发明实施例提供的上述全息显示装置中,相位控制板300中的各调制区域调制光线的相位调制角度可以是固定的,或者,也可以根据接收的控制信号(例如振幅调制信号)而动态变化。
具体地,在本发明实施例提供的上述全息显示装置中,根据是否需要相位控制板300中各调制区域动态调节相位调制角度,可以选择具体的相位控制板300的实现方式,例如在固定相位控制板300中的各调制区域调制光线的相位调制角度时,相位控制板300可以选择光栅相位控制板、光层厚度相位控制板、或液晶相位控制板。当需要相位控制板300中的各调制区域调制光线的相位调制角度动态变化时,相位控制板300可以选择液晶相位控制板。
其中,具体地,光栅相位控制板是指相位控制板300中各调制区域设置光栅周期不同的纳米光栅,以实现对于通过的光线的光波相位信息进行不同程度的相位角度调制。在如图6所示的相位控制板300的示例中,在第一调制区域310和第二调制区域320中分别设置了光栅周期不同的第一纳米光栅330和第二纳米光栅340,这可以实现对于通过第一调制区域310和第二调制区域320的光线的光波相位信息进行不同程度的相位角度调制。光层厚度相位控制板是指相位控制板300中各调制区域设置厚度不同的薄膜叠层,以实现对于通过的光线的光波相位信息进行不同程度的相位角度调制。在如图7所示的相位控制板300的示例中,在第一调制区域310和第二调制区域320中的膜层厚度不同,这也可以实现对于通过第一调制区域310和第二调制区域320的光线的光波相位信息进行不同程度的相位角度调制。液晶相位控制板是指相位控制板300中各调制区域设置独立可控的液晶盒,通过对液晶盒中液晶分子旋转角度的控制,以实现对于通过的光线的光波相位信息进行不同程度的相位角度调制。在如图8所示的相位控制板300的示例中,在诸如第一调制区域310和第二调制区域320等调制区域中均设置有液晶盒350,通过对于液晶盒中液晶分子旋转角度的控制(例如对于液晶盒中的液晶分子层上的电压的控制),可以对经过各个调制区域的光线的光波相位信息进行不同程度的相位角度调制。
在上述图6至图8中,为了更清楚地示出相位控制板300,而没有示出光开关器件200。这仅仅是示例性的。
基于同一发明构思,本发明实施例还提供了一种全息显示装置的显示方法,由于该显示方法解决问题的原理与前述一种全息显示装置相似,因此该显示方法的实施可以参见全息显示装置的实施,重复之处不再赘述。
具体地,本发明实施例提供的一种全息显示装置的显示方法,如图9所示,包括以下步骤:
S1、背光源提供相干参考光;
S2、相位控制板调制相干参考光的光波相位信息;和
S3、光开关器件根据接收到调制信号调制相干参考光的光波振幅信息,以实现动态全息显示。
在具体实施时,信号源可以根据所需显示的全息图像信息,进行振幅信息和相位信息的分离,之后将调制信息加载至调制信号中发送给光开关器件进行调控,同时还可以根据相位信息对相位控制板进行调控,或者使用固定调制的相位控制板对光波相位信息进行调制;通过光开关器件调制光波振幅信息,同时通过相位控制板调制光波相位信息后,可以实现全息图像的重现。
本发明实施例提供的上述全息显示装置及其显示方法,包括:用于提供相干参考光的背光源,用于调制相干参考光的光波振幅信息的光开关器件,以及用于调制相干参考光的光波相位信息的相位控制板;其中,相位控制板和光开关器件设置于背光源 的出光侧。由于将相位调制和振幅调制分开设置,实现独立控制光波相位信息和光波振幅信息,利用光开关器件进行光波振幅信息的调制,利用相位控制板进行光波相位信息的调制,有利于提高对调制对象的控制能力,实现高质量的全息显示。并且,可以采用相位控制板调制光波相位信息,可以实现多视角的裸眼三维显示。
显然,本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。

Claims (10)

  1. 一种全息显示装置,包括:用于提供相干参考光的背光源,用于调制所述相干参考光的光波振幅信息的光开关器件,以及用于调制所述相干参考光的光波相位信息的相位控制板;其中,所述相位控制板和所述光开关器件设置于所述背光源的出光侧。
  2. 如权利要求1所述的全息显示装置,其中,所述相位控制板设置于所述背光源与所述光开关器件之间;或,所述相位控制板设置于所述光开关器件的出光侧。
  3. 如权利要求1所述的全息显示装置,其中,所述相位控制板包括多个相互独立的调制区域;所述调制区域中的一个与所述光开关器件中的一个像素区域一一对应,或,所述调制区域中的一个与所述光开关器件中的多个像素区域对应。
  4. 如权利要求3所述的全息显示装置,其中,相邻的两个所述调制区域调制所述相干参考光的相位调制角度互不相同。
  5. 如权利要求4所述的全息显示装置,其中,各所述调制区域调制所述相干参考光的相位调制角度是固定的。
  6. 如权利要求4所述的全息显示装置,其中,各所述调制区域调制所述相干参考光的相位调制角度能够根据接收的振幅调制信号变化。
  7. 如权利要求4所述的全息显示装置,其中,所述相位控制板包括光栅相位控制板、光层厚度相位控制板、或液晶相位控制板。
  8. 如权利要求1所述的全息显示装置,其中,所述光开关器件包括液晶显示器件,电致变色器件,或光致变色器件。
  9. 如权利要求1-8任一项所述的全息显示装置,其中,所述背光源提供的相干参考光为相干准直光。
  10. 一种如权利要求1-9任一项所述的全息显示装置的显示方法,所述方法包括:
    背光源提供相干参考光;
    相位控制板调制所述相干参考光的光波相位信息;
    光开关器件根据接收到的调制信号调制所述相干参考光的光波振幅信息。
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