技术领域technical field
本发明涉及全息显示技术领域，特别涉及一种全息显示装置及方法。The present invention relates to the technical field of holographic display, in particular to a holographic display device and method.
背景技术Background technique
全息显示即利用全息原理实现的真实的立体显示，可看到立体显示的全部特征，并有视差效应。Holographic display is a real three-dimensional display realized by using the holographic principle, and all the characteristics of the three-dimensional display can be seen, and there is a parallax effect.
液晶空间光调制器(SLM，Spatial Light Modulator)是指在主动控制下，通过液晶分子调制光场的某个参量，从而将一定的信息写入光波中，用于达到光波调制的目的。一般地说，空间光调制器含有许多独立单元，他们在空间上排列成一维或二维阵列，每个单元都可以独立地接收光学信号或电学信号的控制，并按此信号改变自身的光学性质，从而对照明在其上的光波进行调制。这类器件可在随时间变化的电驱动信号或其他信号的控制下，改变空间上光分布的振幅或强度、相位、偏振态以及波长，或者把非相干光转化成相干光。由于液晶空间光调制器的这种性质，它可以作为全息图像信息的读取装置，即利用液晶空间光调制器在信号控制下对于空间光的调制作用可以实现全息图像的读取和再现。但是，由于液晶材料的响应速度限制，导致图像刷新频率受限，因此，采用液晶空间光调制器进行全息图像的再现效果还不够理想。Liquid crystal spatial light modulator (SLM, Spatial Light Modulator) refers to the modulation of a certain parameter of the light field through liquid crystal molecules under active control, so as to write certain information into the light wave for the purpose of light wave modulation. Generally speaking, a spatial light modulator contains many independent units, which are arranged in a one-dimensional or two-dimensional array in space, and each unit can independently receive the control of an optical signal or an electrical signal, and change its optical properties according to this signal , thereby modulating the light waves illuminating it. Such devices can change the amplitude or intensity, phase, polarization state, and wavelength of light distribution in space or convert incoherent light into coherent light under the control of time-varying electrical driving signals or other signals. Due to the nature of the liquid crystal spatial light modulator, it can be used as a reading device for holographic image information, that is, the modulation of spatial light by the liquid crystal spatial light modulator under signal control can realize the reading and reproduction of holographic images. However, due to the limitation of the response speed of the liquid crystal material, the image refresh frequency is limited. Therefore, the reproduction effect of the holographic image by using the liquid crystal spatial light modulator is not ideal enough.
发明内容Contents of the invention
本发明公开了一种全息显示装置及方法，用于提供一种图像再现效果较好的全息显示装置和方法。The invention discloses a holographic display device and method, which are used to provide a holographic display device and method with better image reproduction effect.
为达到上述目的，本发明提供以下技术方案：To achieve the above object, the present invention provides the following technical solutions:
一种全息显示装置，包括：A holographic display device, comprising:
至少两个液晶空间光调制器(SLM)；at least two liquid crystal spatial light modulators (SLMs);
图像信息写入器，用于将一个全息图的图像信息写入所述至少两个液晶空间光调制器中，所述至少两个液晶空间光调制器中写入的图像信息不同；An image information writer, configured to write image information of a hologram into the at least two liquid crystal spatial light modulators, where the image information written in the at least two liquid crystal spatial light modulators is different;
光源模块，用于为所述至少两个液晶空间光调制器提供读出光；A light source module, configured to provide readout light for the at least two liquid crystal spatial light modulators;
聚光器，用于将所述至少两个液晶空间光调制器的输出光汇聚成像。The light concentrator is used for converging the output light of the at least two liquid crystal spatial light modulators into an image.
本发明提供的全息显示装置中，SLM可以读取图像信息写入器写入的全息图像信息，并根据该信息对读出光进行调制，进而实现全息图像的再现。并且，该全息显示装置，通过两个或多个SLM来进行全息图像信息的读取，每个SLM只负责全息图像的部分信息的读取和再现，从而，有效增加了整个全息图像的读取速率，进而，在单位时间内能够输出更多物光波的图像信息，从而可以大大提高全息图像的刷新频率，有效改善全息图像再现效果。In the holographic display device provided by the present invention, the SLM can read the holographic image information written by the image information writer, and modulate the readout light according to the information, so as to realize the reproduction of the holographic image. Moreover, the holographic display device reads the holographic image information through two or more SLMs, and each SLM is only responsible for reading and reproducing part of the information of the holographic image, thereby effectively increasing the reading of the entire holographic image. In turn, more image information of object light waves can be output per unit time, so that the refresh frequency of holographic images can be greatly increased, and the reproduction effect of holographic images can be effectively improved.
可选的，每个所述液晶空间光调制器的刷新频率相同，且所述至少两个液晶空间光调制器的刷新频率之和等于所述全息图的刷新频率。Optionally, the refresh frequency of each of the liquid crystal spatial light modulators is the same, and the sum of the refresh frequencies of the at least two liquid crystal spatial light modulators is equal to the refresh frequency of the hologram.
可选的，所述图像信息写入器，用于向所述至少两个液晶空间光调制器中分别写入不同视角的图像信息。Optionally, the image information writer is configured to respectively write image information of different viewing angles into the at least two liquid crystal spatial light modulators.
可选的，所述图像信息写入器，用于将每个视角的全息图像分割为M×N的数字图像阵列，然后将所述数字图像阵列写入对应的液晶空间光调制器；其中，M为所述全息图像的空间序列，N为所述全息图像的时间序列，M和N均为不小于1的整数。Optionally, the image information writer is configured to divide the holographic image of each viewing angle into an M×N digital image array, and then write the digital image array into a corresponding liquid crystal spatial light modulator; wherein, M is the spatial sequence of the holographic images, N is the time sequence of the holographic images, and both M and N are integers not less than 1.
可选的，所述图像信息写入器，用于向所述至少两个液晶空间光调制器中分别写入同一画面的不同帧的图像信息。Optionally, the image information writer is configured to respectively write image information of different frames of the same picture into the at least two liquid crystal spatial light modulators.
可选的，所述光源模块包括：Optionally, the light source module includes:
相干光源；coherent light source;
分光器，用于将所述相干光源分离为至少两束子光源，所述至少两束子光源与所述至少两个液晶空间光调制器一一对应；a beam splitter, configured to separate the coherent light source into at least two beams of sub-light sources, and the at least two beams of sub-light sources correspond to the at least two liquid crystal spatial light modulators;
光路校准器，用于使每束子光源垂直照射至与其对应的所述液晶空间光调制器中。The optical path collimator is used to vertically irradiate each sub-light source into the corresponding liquid crystal spatial light modulator.
可选的，所述分光器包括依次层叠的多层透明介质层，每层介质层的折射率不同；每相邻的两个所述介质层的折射率满足一束子光源的全反射条件，且所述子光源从所述两个介质层之间反射至所述光路校准器上。Optionally, the beam splitter includes multiple layers of transparent medium layers stacked in sequence, and the refractive index of each medium layer is different; the refractive index of every two adjacent medium layers satisfies the total reflection condition of a sub-light source, and The sub-light source is reflected from between the two medium layers to the optical path collimator.
可选的，所述的全息显示装置还包括：Optionally, the holographic display device further includes:
聚光器，用于将所述至少两个液晶空间光调制器的输出光汇聚成像。The light concentrator is used for converging the output light of the at least two liquid crystal spatial light modulators into an image.
可选的，所述液晶空间光调制器为电寻址透射式空间光调制器。Optionally, the liquid crystal spatial light modulator is an electrically addressable transmissive spatial light modulator.
可选的，所述至少两个液晶空间光调制器相互拼接。Optionally, the at least two liquid crystal spatial light modulators are spliced together.
一种全息显示方法，包括：A holographic display method, comprising:
分别向至少两个液晶空间光调制器提供读出光，并将所述至少两个液晶空间光调制器的输出光汇聚成像；providing readout light to at least two liquid crystal spatial light modulators respectively, and converging the output lights of the at least two liquid crystal spatial light modulators into an image;
将一个全息图的图像信息写入所述至少两个液晶空间光调制器中，所述至少两个液晶空间光调制器中写入的图像信息不同。The image information of one hologram is written into the at least two liquid crystal spatial light modulators, and the image information written in the at least two liquid crystal spatial light modulators is different.
可选的，每个所述液晶空间光调制器的刷新频率相同，且所述至少两个液晶空间光调制器的刷新频率之和等于所述全息图的刷新频率。Optionally, the refresh frequency of each of the liquid crystal spatial light modulators is the same, and the sum of the refresh frequencies of the at least two liquid crystal spatial light modulators is equal to the refresh frequency of the hologram.
可选的，所述将一个全息图的图像信息写入所述至少两个液晶空间光调制器中，包括：Optionally, writing the image information of a hologram into the at least two liquid crystal spatial light modulators includes:
向所述至少两个液晶空间光调制器中分别写入不同视角的图像信息。Image information of different viewing angles is respectively written into the at least two liquid crystal spatial light modulators.
可选的，所述将一个全息图的图像信息写入所述至少两个液晶空间光调制器中，包括：Optionally, writing the image information of a hologram into the at least two liquid crystal spatial light modulators includes:
向所述至少两个液晶空间光调制器中分别写入同一画面的不同帧的图像信息。The image information of different frames of the same picture is respectively written into the at least two liquid crystal spatial light modulators.
附图说明Description of drawings
图1为本发明实施例提供的一种全息显示装置的结构示意图；FIG. 1 is a schematic structural diagram of a holographic display device provided by an embodiment of the present invention;
图2为本发明实施例提供的一种全息显示装置的结构原理示意图；Fig. 2 is a schematic diagram of the structure and principle of a holographic display device provided by an embodiment of the present invention;
图3为本发明实施例提供的一种数字图像阵列的示意图；FIG. 3 is a schematic diagram of a digital image array provided by an embodiment of the present invention;
图4为本发明实施例提供的一种全息显示方法的流程图。Fig. 4 is a flowchart of a holographic display method provided by an embodiment of the present invention.
具体实施方式Detailed ways
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做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。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
如图1和图2所示，本发明实施例提供了一种全息显示装置，包括：As shown in Figure 1 and Figure 2, an embodiment of the present invention provides a holographic display device, including:
至少两个液晶空间光调制器(SLM)11；at least two liquid crystal spatial light modulators (SLM) 11;
图像信息写入器2，用于将一个全息图的图像信息写入上述至少两个SLM11中，且上述至少两个SLM11中写入的图像信息彼此不同；An image information writer 2, configured to write image information of a hologram into the at least two SLMs 11, and the image information written in the at least two SLMs 11 is different from each other;
光源模块3，用于为上述每个SLM11提供读出光L；A light source module 3, configured to provide readout light L for each of the above SLM11;
聚光器4，用于将至少两个SLM11的输出光汇聚成像。The light concentrator 4 is used for converging the output lights of at least two SLM11 into an image.
本发明提供的全息显示装置中，SLM11可以读取图像信息写入器2写入的全息图像信息，并根据该信息对读出光L进行调制，进而实现全息图像的再现。并且，该全息显示装置，通过两个或多个SLM11来进行全息图像信息的读取，每个SLM11只负责全息图像的部分信息的读取和再现，从而，有效增加了整个全息图像的读取速率，进而，在单位时间内能够输出更多物光波的图像信息，从而可以大大提高全息图像的刷新频率，有效改善全息图像再现效果。In the holographic display device provided by the present invention, the SLM 11 can read the holographic image information written by the image information writer 2, and modulate the readout light L according to the information, so as to realize the reproduction of the holographic image. Moreover, the holographic display device reads the holographic image information through two or more SLM11, and each SLM11 is only responsible for reading and reproducing part of the information of the holographic image, thereby effectively increasing the reading of the entire holographic image. In turn, more image information of object light waves can be output per unit time, so that the refresh frequency of holographic images can be greatly increased, and the reproduction effect of holographic images can be effectively improved.
如图1和图2所示，一种具体的实施例中，每个SLM11的刷新频率相同，且所有SLM11的刷新频率之和等于全息图的刷新频率。As shown in FIG. 1 and FIG. 2 , in a specific embodiment, the refresh frequency of each SLM 11 is the same, and the sum of the refresh frequencies of all SLM 11 is equal to the refresh frequency of the hologram.
以全息显示装置包括三个SLM11为例，假设一个SLM11的刷新频率是60Hz，将三个SLM11叠加起来，全息图的刷新频率就可以达到180Hz。Taking the holographic display device including three SLM11s as an example, assuming that the refresh rate of one SLM11 is 60 Hz, the refresh rate of the hologram can reach 180 Hz by superimposing three SLM11s.
如图1和图2所示，一种具体的实施例中，所有液晶空间光调制器11可以相互拼接组装为一个调制器模块1，此时，光源模块3可以输出若干束平行光作为读出光L，并对应照射至各液晶空间光调制器11上。As shown in Figure 1 and Figure 2, in a specific embodiment, all liquid crystal spatial light modulators 11 can be spliced together to form a modulator module 1, at this time, the light source module 3 can output several beams of parallel light as readout The light L is irradiated onto each liquid crystal spatial light modulator 11 correspondingly.
如图1和2所示，一种具体的实施例中，液晶空间光调制器(SLM)11为电寻址透射式空间光调制器。即读出光L的读出方式为透射式，输入的控制信号S为电信号，即全息图像信息以电信号的方式写入SLM11。As shown in FIGS. 1 and 2 , in a specific embodiment, the liquid crystal spatial light modulator (SLM) 11 is an electrically addressable transmissive spatial light modulator. That is, the readout mode of the readout light L is transmissive, and the input control signal S is an electrical signal, that is, the holographic image information is written into the SLM 11 in the form of an electrical signal.
如图1所示，一种具体的实施例中，图像信息写入器2可以为计算机，也可以为其它能够向液晶空间光调制器1中写入数字全息图像的装置。As shown in FIG. 1 , in a specific embodiment, the image information writer 2 may be a computer, or other devices capable of writing digital holographic images into the liquid crystal spatial light modulator 1 .
全息技术是利用干涉原理，将物体发出的特定光波以干涉条纹的形式记录下来，使物光波前的全部信息都存储在记录介质，所记录的干涉条纹图样被称为“全息图”。数字全息图是计算机技术和全息技术结合的产物，它通过电子元件记录全息图，并实现对图像的实时处理；同时，还可以通过计算机对数字图像进行定量分析，通过计算得到图像的强度和相位分布，并且模拟多个全息图的叠加等操作。因此，由数字全息技术得到的数字全息图可以通过电寻址液晶空间光调制器和计算机控制实现实时光电再现，为全息图的实时动态再现提供技术基础。Holographic technology uses the interference principle to record the specific light waves emitted by the object in the form of interference fringes, so that all the information of the object light wavefront is stored in the recording medium, and the recorded interference fringe pattern is called "hologram". Digital hologram is the product of the combination of computer technology and holographic technology. It records holograms through electronic components and realizes real-time processing of images. At the same time, digital images can also be quantitatively analyzed by computer, and the intensity and phase of images can be obtained by calculation. distribution, and simulate operations such as the superposition of multiple holograms. Therefore, the digital hologram obtained by digital holography technology can realize real-time photoelectric reproduction through electrically addressable liquid crystal spatial light modulator and computer control, providing a technical basis for real-time dynamic reproduction of holograms.
如图1和图2所示，一种具体的实施例中，图像信息写入器2，用于向各个SLM11中写入不同视角的图像信息。将每个SLM11写入不同视角的全息图像，则通过至少两个SLM11就可以再现至少两个视角的全息图像，从而再现大视角立体全息图。As shown in FIG. 1 and FIG. 2 , in a specific embodiment, the image information writer 2 is configured to write image information of different viewing angles into each SLM 11 . If each SLM11 writes holographic images of different viewing angles, at least two SLM11 can reproduce holographic images of at least two viewing angles, thereby reproducing a stereoscopic hologram with a large viewing angle.
以全息显示装置包括三个SLM11为例，一个SLM11负责显示一个视角的图像，三个SLM11就可以实现一个物体的三个视角全息图的显示，以此类推，多个SLM11拼接起来就可以输出足够大视角的实时动态全息图。这样左右眼几乎可以在同时观察到来自不同侧面的物光波信息，从而产生效果良好的立体视觉。Taking the holographic display device including three SLM11s as an example, one SLM11 is responsible for displaying images of one viewing angle, and three SLM11s can realize the display of three viewing angle holograms of an object, and so on, multiple SLM11s spliced together can output enough Real-time dynamic hologram with large viewing angle. In this way, the left and right eyes can almost observe the object light wave information from different sides at the same time, thereby producing good stereoscopic vision.
可选的，图像信息写入器2，用于将每个视角的全息图像分割为M×N的数字图像阵列，如图3所示，其中，M为全息图像的空间序列，N为全息图像的时间序列，M和N均为不小于1的整数，然后，将每个数字图像阵列写入与其对应的SLM11。Optionally, the image information writer 2 is configured to divide the holographic image of each viewing angle into an M×N digital image array, as shown in FIG. 3 , where M is the spatial sequence of the holographic image, and N is the holographic image M and N are both integers not less than 1, and then write each digital image array into its corresponding SLM11.
具体的，对于动态显示，可以随着物体的变化计算得到不同瞬间物体的全息图，然后将计算得到的全息图分割为一系列M×N像素的灰度数字图像作为SLM11的输入图像，进而，就可以输出足够大的实时动态全息图。Specifically, for dynamic display, the holograms of objects at different instants can be calculated as the objects change, and then the calculated holograms can be divided into a series of grayscale digital images of M×N pixels as the input image of SLM11, and then, A sufficiently large real-time dynamic hologram can be output.
另一种具体的实施例中，图像信息写入器2，用于向各个SLM11中写入同一画面的不同帧的图像信息。In another specific embodiment, the image information writer 2 is configured to write image information of different frames of the same picture into each SLM 11 .
每个SLM11写入同一画面不同帧的图像信息，则通过两个或多个SLM11可以提高再现画面的频率，从而提高动态画面的清晰度。Each SLM11 writes the image information of different frames of the same picture, and two or more SLM11 can increase the frequency of reproducing the picture, thereby improving the definition of the dynamic picture.
如图1和图2所示，一种具体的实施例中，光源模块3可以由相干光源31，分光器32和光路校准器等组成；具体的，分光器32用于将相干光源31分离为多束子光源，该多束子光源与SLM11一一对应；光路校准器用于使每束子光源垂直照射至与其对应的SLM11上。进而，该光源模块3仅通过一个相干光源31即可以为每个SLM11提供读出光L。As shown in Figures 1 and 2, in a specific embodiment, the light source module 3 can be composed of a coherent light source 31, a beam splitter 32, and an optical path calibrator; specifically, the beam splitter 32 is used to separate the coherent light source 31 into Multiple beams of sub-light sources, the multiple beams of sub-light sources correspond to the SLM11 one by one; the optical path collimator is used to make each beam of sub-light sources vertically irradiate on the corresponding SLM11. Furthermore, the light source module 3 can provide each SLM 11 with readout light L through only one coherent light source 31 .
可选的，分光器32可以包括依次层叠的多层透明介质层321，每层介质层321的折射率不同。相干光源31发出的光依次经过多层透明介质层321时，由于不同波长的光在介质中全反射条件不同，可以分离出来多束不同波长的光。具体的，每相邻的两个介质层321的折射率满足一束子光源的全反射条件，且每束子光源在两个介质层321之间反射后到达至光路校准器上。Optionally, the beam splitter 32 may include multiple layers of transparent medium layers 321 stacked in sequence, and each layer of the medium layer 321 has a different refractive index. When the light emitted by the coherent light source 31 passes through the multi-layer transparent medium layer 321 sequentially, since the light of different wavelengths has different total reflection conditions in the medium, multiple beams of light of different wavelengths can be separated. Specifically, the refractive index of each adjacent two dielectric layers 321 satisfies the total reflection condition of a sub-light source, and each sub-light source reaches the optical path collimator after being reflected between the two dielectric layers 321 .
如图1所示，以三个SLM11的拼接为例，此时，分光器32可以包括依次层叠的四层透明介质层321，其中，该四层透明介质层321的折射率n1、n2、n3和n4满足n1＞n2＞n3＞n4；进而，在每两个介质层321之间可以有部分光满足全反射条件而被反射出来，则四层透明介质层321可以反射出三束波长不同的光，以分别作为三个SLM11的读出光L。As shown in Figure 1, taking the splicing of three SLM11 as an example, at this time, the beam splitter 32 can include four layers of transparent medium layers 321 stacked in sequence, wherein the refractive indices n1, n2, n3 of the four layers of transparent medium layers 321 and n4 satisfy n1>n2>n3>n4; furthermore, between every two dielectric layers 321, part of the light can meet the total reflection condition and be reflected, then the four-layer transparent dielectric layer 321 can reflect three beams with different wavelengths The light is used as the readout light L of the three SLM11 respectively.
可选的，光路校准器可以包括至少一组反射镜33，分光器32分出的多束光可以通过反射镜33实现光路的校准，具体的，通过反射镜33可以将上述多束光校准为平行光，并使每束光垂直照射至与其对应的SLM11上。Optionally, the optical path calibrator may include at least one set of reflective mirrors 33, and the multiple beams of light split by the beam splitter 32 may be calibrated through the reflective mirrors 33. Specifically, the above multiple beams of light may be calibrated by the reflective mirrors 33 as Parallel light, and make each beam of light vertically shine on the corresponding SLM11.
进一步可选的，聚光器4可以包括透镜41。Further optionally, the concentrator 4 may include a lens 41 .
具体的，每束读出光L照射至与其对应的SLM11上后，经过该SLM11的相位调制，形成需要呈现的全息像的一部分，例如，形成需要呈现的全息像的其中一个视角的像，或者是形成需要呈现的全息像的其中一帧的像；然后，多束载有像信息的光合成的光束经过聚光器4会聚，最后可以在聚光器4的焦平面处得到全息再现像。Specifically, after each beam of readout light L is irradiated on the corresponding SLM11, it undergoes phase modulation by the SLM11 to form a part of the holographic image to be presented, for example, to form an image of one of the viewing angles of the holographic image to be presented, or It is the image of one frame of the holographic image that needs to be presented; then, multiple optically synthesized beams carrying image information are converged by the condenser 4, and finally the holographic reproduction image can be obtained at the focal plane of the condenser 4.
另外，本发明实施例还提供了一种全息显示方法，如图1和图4所示，该全息显示方法包括以下步骤：In addition, the embodiment of the present invention also provides a holographic display method, as shown in Figure 1 and Figure 4, the holographic display method includes the following steps:
步骤101，分别向至少两个液晶空间光调制器(SLM)11提供读出光，并将该至少两个SLM11的输出光汇聚成像；Step 101, providing readout light to at least two liquid crystal spatial light modulators (SLMs) 11, and converging the output lights of the at least two SLMs 11 into an image;
步骤102，将一个全息图的图像信息写入该至少两个SLM11中，且该至少两个SLM11中写入的图像信息各不相同。Step 102 , writing image information of a hologram into the at least two SLMs 11 , and the image information written in the at least two SLMs 11 is different.
本发明提供的全息显示方法中，SLM11可以读取全息图像信息，并根据该信息对读出光进行调制，进而实现全息图像的再现。并且，该方法中，通过两个或多个SLM11来进行全息图像信息的读取，每个SLM11只负责部分全息图像信息的读取和再现，从而，有效增加了整个全息图像的读取速率，进而，在单位时间内能够输出更多物光波的图像信息，从而可以大大提高全息图像的刷新频率，从而有效改善全息图像再现效果。In the holographic display method provided by the present invention, the SLM11 can read the holographic image information, and modulate the readout light according to the information, so as to realize the reproduction of the holographic image. Moreover, in this method, two or more SLM11 are used to read the holographic image information, and each SLM11 is only responsible for reading and reproducing part of the holographic image information, thereby effectively increasing the reading rate of the entire holographic image, Furthermore, more image information of the object light wave can be output per unit time, so that the refresh frequency of the holographic image can be greatly increased, thereby effectively improving the reproduction effect of the holographic image.
一种具体的实施例中，每个SLM11的刷新频率相同，且所有SLM11的刷新频率之和等于全息图的刷新频率。In a specific embodiment, the refresh frequency of each SLM11 is the same, and the sum of the refresh frequencies of all SLM11 is equal to the refresh frequency of the hologram.
以全息显示装置包括三个SLM11为例，假设一个SLM11的刷新频率是60Hz，将三个SLM11叠加起来，全息图的刷新频率就可以达到180Hz。Taking the holographic display device including three SLM11s as an example, assuming that the refresh rate of one SLM11 is 60 Hz, the refresh rate of the hologram can reach 180 Hz by superimposing three SLM11s.
一种具体的实施例中，步骤102，具体可以为：向至少两个SLM11中分别写入不同视角的图像的信息。In a specific embodiment, step 102 may specifically include: writing information of images of different viewing angles into at least two SLMs 11 .
将每个SLM11写入不同视角的全息图，则通过至少两个SLM11就可以再现至少两个视角下的全息图像，从而再现大视角全息图像。以采用三个SLM11为例，一个SLM11负责显示一个视角的图像，三个SLM11就可以实现一个物体的三个视角全息图的显示，以此类推，多个SLM11拼接起来就可以输出足够大视角的实时动态全息图。这样左右眼几乎可以在同时观察到来自不同侧面的物光波信息，从而产生效果良好的立体视觉。By writing holograms of different viewing angles into each SLM 11, at least two SLMs 11 can reproduce holographic images under at least two viewing angles, thereby reproducing a large viewing angle holographic image. Taking three SLM11s as an example, one SLM11 is responsible for displaying images of one viewing angle, and three SLM11s can realize the display of holograms of three viewing angles of an object, and so on, multiple SLM11s spliced together can output a hologram with a large enough viewing angle. Real-time dynamic hologram. In this way, the left and right eyes can almost observe the object light wave information from different sides at the same time, thereby producing good stereoscopic vision.
可选的，可以将每个视角的全息图像分割为M×N的数字图像阵列，如图3所示，其中，M为全息图像的空间序列，N为全息图像的时间序列，M和N均为不小于1的整数；然后，将每个数字图像阵列写入对应的SLM11。Optionally, the holographic image of each viewing angle can be divided into an M×N digital image array, as shown in FIG. is an integer not less than 1; then, write each digital image array into the corresponding SLM11.
具体的，对于动态显示，可以随着物体的变化计算得到不同瞬间物体的全息图，然后将计算得到的全息图分割为一系列M×N像素的灰度数字图像作为液晶空间光调制器1的输入图像，进而，就可以输出足够大的实时动态全息图。Specifically, for dynamic display, the holograms of objects at different instants can be calculated as the objects change, and then the calculated holograms can be divided into a series of grayscale digital images of M×N pixels as the liquid crystal spatial light modulator 1 The input image, and then, can output a sufficiently large real-time dynamic hologram.
另一种具体的实施例中，步骤102，具体可以为：向至少两个SLM11中分别写入同一画面的不同帧的图像信息。In another specific embodiment, step 102 may specifically be: writing image information of different frames of the same picture into at least two SLMs 11 .
每个SLM11写入同一画面不同帧的图像信息，则通过至少两个SLM11可以提高再现画面的频率，从而提高动态画面的清晰度。Each SLM11 writes the image information of different frames of the same picture, and at least two SLM11 can increase the frequency of reproducing the picture, thereby improving the definition of the dynamic picture.
本发明实施例提供的全息显示技术和方法，基于液晶空间光调制器的数字全息再现技术，可以实现大视角实时动态的全息显示，对于实时全息立体显示技术向实用方向的研究发展具有重要意义。The holographic display technology and method provided by the embodiments of the present invention, based on the digital holographic reproduction technology of the liquid crystal spatial light modulator, can realize real-time dynamic holographic display with a large viewing angle, which is of great significance for the research and development of the real-time holographic stereoscopic display technology towards the practical direction.
显然，本领域的技术人员可以对本发明实施例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。Apparently, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811074707.1ACN109031916A (en) | 2018-09-14 | 2018-09-14 | A kind of holographic display and method |
| Application Number | Priority Date | Filing Date | Title |
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| CN201811074707.1ACN109031916A (en) | 2018-09-14 | 2018-09-14 | A kind of holographic display and method |
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| CN109031916Atrue CN109031916A (en) | 2018-12-18 |
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| CN201811074707.1APendingCN109031916A (en) | 2018-09-14 | 2018-09-14 | A kind of holographic display and method |
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| CN112071174A (en)* | 2020-09-14 | 2020-12-11 | 西安中科微星光电科技有限公司 | Optical teaching system based on transmission-type spatial light modulator |
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