技术领域technical field
本发明涉及计算机视觉技术和立体视频领域，尤其涉及一种立体投影显示装置。The invention relates to the field of computer vision technology and stereoscopic video, in particular to a stereoscopic projection display device.
背景技术Background technique
基于投影的多视角裸眼立体显示是一种通过在左右眼中分别投射不同的画面进而虚拟出画面中物体的深度信息，最终实现景象的立体显示的一种技术，同时，通过移动观察位置还能看到不同视角的立体画面。这种技术是一种准3D显示技术，因为所展示的视角画面是断续的，与自然场景的连续视角显示存在区别。Projection-based multi-view glasses-free stereoscopic display is a technology that projects different images in the left and right eyes to virtualize the depth information of the objects in the image, and finally realizes the stereoscopic display of the scene. Stereoscopic images from different perspectives. This technology is a quasi-3D display technology, because the displayed perspective pictures are intermittent, which is different from the continuous perspective display of natural scenes.
多视角裸眼立体显示技术主要可以分为两类：平板式立体显示技术和投影式立体显示技术。The multi-view glasses-free stereoscopic display technology can be mainly divided into two categories: flat panel stereoscopic display technology and projection stereoscopic display technology.
平板式立体显示技术通过在传统的平板显示器如LCD上增加一层光栅，而在显示的时候提供的是交织分隔的视图图像，经过光栅的分光作用就能实现不同位置观看到不同视角从而得到立体显示的效果。这种方式能与传统的显示系统兼容，但是最大的缺点是会造成分辨率的损失，且视角数越多，分辨率损失越严重。The flat-panel stereoscopic display technology adds a layer of grating to the traditional flat-panel display such as LCD, and provides interlaced and separated view images when displaying. After the light-splitting effect of the grating, different positions can be viewed from different angles of view to obtain a three-dimensional displayed effect. This method is compatible with traditional display systems, but the biggest disadvantage is that it will cause a loss of resolution, and the more the number of viewing angles, the more serious the loss of resolution.
现有的投影式立体显示技术则大多是通过投影仪阵列与菲涅尔透镜或者柱透镜光栅配合实现立体显示。这种投影仪立体显示技术依然存在一些弊端：如投影仪布置需要满足一定的条件如投影仪到显示屏之间的距离要大于一定值，且观看者无法在投影仪和屏幕之间看到图像，而是屏幕位于观看者和投影仪之间，这使得整个投影显示装置的使用受到空间的限制，不能进行自由布置；其次，由于投影仪和显示屏之间存在较大空间距离，所得到的图像的光线四向散开，光损较大，造成图像亮度低；再次，空间的其他外来光线容易干扰成像质量。Most of the existing projected stereoscopic display technologies realize stereoscopic display through the cooperation of projector arrays and Fresnel lenses or cylindrical lens gratings. This projector stereoscopic display technology still has some disadvantages: for example, the layout of the projector needs to meet certain conditions, such as the distance between the projector and the display screen is greater than a certain value, and the viewer cannot see the image between the projector and the screen , but the screen is located between the viewer and the projector, which makes the use of the entire projection display device limited by space and cannot be freely arranged; secondly, due to the large spatial distance between the projector and the display screen, the obtained The light of the image is scattered in all directions, resulting in large light loss, resulting in low image brightness; thirdly, other external light in the space is likely to interfere with the image quality.
发明内容Contents of the invention
本发明的主要目的在于提供一种立体投影显示装置，以解决现有的投影式立体显示技术存在的成像亮度低、质量低以及布置方式占空间的技术问题。The main purpose of the present invention is to provide a stereoscopic projection display device to solve the technical problems of low imaging brightness, low quality and space-occupying arrangement existing in the existing projection stereoscopic display technology.
本发明通过以下技术方案来解决前述的技术问题：The present invention solves the foregoing technical problems through the following technical solutions:
一种立体投影显示装置，包括显示屏和投影仪阵列，所述显示屏包括离所述投影仪阵列由近及远依次紧贴设置的菲涅尔透镜、纵向散射层和镜面反射层，且所述菲涅尔透镜以平的一面与所述纵向散射层接触，所述菲涅尔透镜水平方向的焦距小于垂直方向的焦距；所述纵向散射层用于对光线进行垂直方向上的散射；所述投影仪阵列包括放置于所述菲涅尔透镜垂直方向的焦平面上的至少两台投影仪；所述菲涅尔透镜的参数可依据不同的观看指标进行调整，以形成不同的观看区域，其中所述观看指标包括观看距离和观看角度，所述菲涅尔透镜的参数包括水平方向的焦距和垂直方向的焦距。A stereoscopic projection display device, including a display screen and a projector array, the display screen includes a Fresnel lens, a longitudinal scattering layer and a specular reflection layer that are arranged in close proximity to the projector array from near to far, and the The Fresnel lens is in contact with the longitudinal scattering layer with a flat side, and the focal length of the Fresnel lens in the horizontal direction is smaller than the focal length in the vertical direction; the longitudinal scattering layer is used to scatter light in the vertical direction; The projector array includes at least two projectors placed on the focal plane in the vertical direction of the Fresnel lens; the parameters of the Fresnel lens can be adjusted according to different viewing indicators to form different viewing areas, Wherein the viewing index includes a viewing distance and a viewing angle, and the parameters of the Fresnel lens include a focal length in a horizontal direction and a focal length in a vertical direction.
优选地，所述投影仪为短焦距激光投影仪。Preferably, the projector is a short-focus laser projector.
优选地，各所述投影仪位于同一条平行于地面的水平线上。Preferably, each of the projectors is located on the same horizontal line parallel to the ground.
本发明提供的立体投影显示装置，与现有技术相比，至少具有以下有益效果：由于菲涅尔透镜的垂直方向焦距大于水平方向焦距，且投影仪不至于透镜垂直方向的焦平面上，所以垂直方向光线两次经菲涅尔透镜且在纵向散射膜的作用下，最终出射时是平行且水平射出(光线之间相互平行且光线与地面平行)，而在水平方向(与地面平行的方向)，上最终出射时是汇聚的。从而投影仪出射的光线在第一次经过菲涅尔透镜，经反射镜反射后经纵向散射，第二次经过菲涅尔透镜后汇聚成一条竖直窄带(但人眼看到的是完整的画面)，又因为纵向散射层的作用，不同的高度均能看到完整的画面。当某两台投影仪将不同视角的图像分别投入人的左右眼时，两个不同视角的竖直窄带分别形成于左右眼处，人眼感受到立体效果，从而实现裸眼立体显示。Compared with the prior art, the stereoscopic projection display device provided by the present invention has at least the following beneficial effects: because the vertical focal length of the Fresnel lens is greater than the horizontal focal length, and the projector is not on the focal plane of the lens vertical direction, so The light in the vertical direction passes through the Fresnel lens twice and under the action of the longitudinal scattering film, it is parallel and horizontal when it finally exits (the light is parallel to each other and the light is parallel to the ground), while in the horizontal direction (parallel to the ground) ), which are convergent when they are finally emitted. Therefore, the light emitted by the projector passes through the Fresnel lens for the first time, is scattered longitudinally after being reflected by the mirror, and converges into a vertical narrow band after passing through the Fresnel lens for the second time (but what the human eye sees is a complete picture ), and because of the effect of the longitudinal scattering layer, a complete picture can be seen at different heights. When two projectors project images of different viewing angles into the left and right eyes of a person, two vertical narrow bands with different viewing angles are formed on the left and right eyes respectively, and the human eyes feel the stereoscopic effect, thereby realizing naked-eye stereoscopic display.
综上所述，本方案中，由于最终出射光线在垂直方向上极少有斜向上或斜向下射出的光线，水平方向也是水平射出且汇聚在某点，从而大大减少了光损，提高了成像的亮度，而环境中的外来干扰光，其光源极少处于菲涅尔透镜垂直方向的焦平面上，所以难以对成像造成干扰，从而成像质量得以提高；另外，当菲涅尔透镜的垂直方向的焦距变小时，投影仪便可以布置得离显示屏更近，增强了布置的灵活性。To sum up, in this solution, since the final outgoing light seldom shoots obliquely upward or downward in the vertical direction, the horizontal direction is also horizontally emitted and converged at a certain point, thereby greatly reducing light loss and improving The brightness of imaging, and the external interference light in the environment, its light source is rarely on the focal plane in the vertical direction of the Fresnel lens, so it is difficult to interfere with the imaging, so that the imaging quality can be improved; in addition, when the vertical direction of the Fresnel lens The smaller the focal length of the direction, the projector can be arranged closer to the display screen, which enhances the flexibility of arrangement.
另一方面，本方案的立体投影显示装置还能实现2D/3D切换，只要将所有投影仪投影同一视角的图像或同一路视频即可，也可以只用一台投影仪工作，而在菲涅尔透镜前再增加一层可控的水平散射层，通过开关控制其散射特性，当需要2D时，此膜为水平散射膜，能将光线水平散射开来，使得任意位置均能看到同样的二维画面。On the other hand, the stereoscopic projection display device of this solution can also realize 2D/3D switching, as long as all the projectors project images of the same viewing angle or the same video, or only one projector can be used to work, and in Fresnel A controllable horizontal scattering layer is added in front of the lens, and its scattering characteristics are controlled by switches. When 2D is required, this film is a horizontal scattering film, which can scatter light horizontally, so that the same image can be seen at any position 2D picture.
在优选的采用短焦距激光投影仪的方案中，基于可调整参数的菲涅尔透镜，配合使用短焦距激光投影仪，可将投影仪布置得离屏幕更近，甚至可以置于屏幕跟前，实现了几乎全自由布置，而且人员的走动也不会阻挡光线。In the preferred solution of using a short-focus laser projector, based on the Fresnel lens with adjustable parameters, the projector can be placed closer to the screen, or even placed in front of the screen, to achieve It is almost completely free to arrange, and the movement of people will not block the light.
附图说明Description of drawings
图1为本发明具体实施例的立体投影显示装置的结构布置侧视图；Fig. 1 is a side view of the structural arrangement of a stereoscopic projection display device according to a specific embodiment of the present invention;
图2为图1的立体投影显示装置的结构布置俯视图；FIG. 2 is a top view of the structural arrangement of the stereoscopic projection display device of FIG. 1;
图3为图1的显示屏结构侧面剖视图；Fig. 3 is a side sectional view of the display screen structure in Fig. 1;
图4为一台投影仪的成像示意图；Fig. 4 is the imaging schematic diagram of a projector;
图5为本发明具体实施例的立体投影显示装置的具体布置俯视图。FIG. 5 is a top view of a specific arrangement of a stereoscopic projection display device according to a specific embodiment of the present invention.
具体实施方式Detailed ways
下面对照附图并结合优选的实施方式对本发明作进一步说明。The present invention will be further described below with reference to the accompanying drawings and in combination with preferred embodiments.
概念定义：Concept definition:
水平方向：平行于地面的方向；Horizontal direction: the direction parallel to the ground;
垂直方向：垂直于地面的方向；Vertical direction: the direction perpendicular to the ground;
本具体实施例部分提供一种如图1和图2所示的立体投影显示装置，包括投影仪阵列10和显示屏20，投影仪阵列10包括两台以上的投影仪，例如，在本实施例中投影仪阵列10包括五台投影仪：11、12、13、14、15；显示屏20包括离投影仪阵列10由近及远依次紧贴设置的菲涅尔透镜21、纵向散射层22和镜面反射层23。菲涅尔透镜的光学特性等同于相同参数的凸透镜，凸透镜有两个方向的光学特性，水平方向和垂直方向，垂直方向的光学特性控制出射光线在垂直方向的角度，而水平方向的光学特性控制出射光线在水平方向的角度，普通的透镜在水平和垂直方向上的特性是一样的，即各向同性的圆形透镜，但在本发明中，菲涅尔透镜21在水平方向的焦距f小于垂直方向的焦距f＇。投影仪阵列10布置于菲涅尔透镜21的垂直方向焦平面上，不仅如此，更优选的方案中还可以使所有投影仪处于同一水平线(平行于地面)上。在本方案中，可以根据观看指标(观看距离和观看角度等)，来设计显示屏的合适参数，主要是菲涅尔透镜的参数，使得菲涅尔透镜水平方向的焦距f小于垂直方向的焦距f＇，然后再根据投影仪阵列的位置和显示屏的参数，确定观看区域。This specific embodiment part provides a stereoscopic projection display device as shown in Figure 1 and Figure 2, including a projector array 10 and a display screen 20, and the projector array 10 includes more than two projectors, for example, in this embodiment The middle projector array 10 includes five projectors: 11, 12, 13, 14, 15; the display screen 20 includes a Fresnel lens 21, a longitudinal scattering layer 22 and Specular reflective layer 23 . The optical characteristics of the Fresnel lens are equivalent to the convex lens with the same parameters. The convex lens has optical characteristics in two directions, the horizontal direction and the vertical direction. The optical characteristics of the vertical direction control the angle of the outgoing light in the vertical direction, while the optical characteristics of the horizontal direction control The angle of the outgoing light in the horizontal direction, the characteristics of common lenses in the horizontal and vertical directions are the same, i.e. an isotropic circular lens, but in the present invention, the focal length f of the Fresnel lens 21 in the horizontal direction is less than The focal length f' in the vertical direction. The projector array 10 is arranged on the vertical focal plane of the Fresnel lens 21 , not only that, but in a more preferable solution, all the projectors can be placed on the same horizontal line (parallel to the ground). In this scheme, the appropriate parameters of the display screen can be designed according to the viewing index (viewing distance and viewing angle, etc.), mainly the parameters of the Fresnel lens, so that the focal length f of the Fresnel lens in the horizontal direction is smaller than the focal length in the vertical direction f', and then determine the viewing area according to the position of the projector array and the parameters of the display screen.
下面阐述本实施例的立体投影显示装置的布置原理和成像过程。The layout principle and imaging process of the stereoscopic projection display device of this embodiment will be described below.
为了便于说明，先阐述一台投影仪的成像过程，以投影仪13为例：投影仪13相当于一个点光源，由于点光源位于菲涅尔透镜21的垂直方向的焦平面上，所以点光源距离菲涅尔透镜的距离(即物距u)刚好等于菲涅尔透镜21的垂直方向焦距f＇的一半(因为光线是两次通过菲涅尔透镜之后平行射出，故而只需半焦入射即可实现平行出射)。投影仪13发出的光线以发散的形式入射到菲涅尔透镜21，经过菲涅尔透镜21后(第一次经过)，光线水平射出，由于纵向散射层22紧贴镜面反射层23，所以光线第一次经过纵向散射层22时，纵向散射层22对光线的散射作用相当于没有，光线在经镜面反射层23反射后，第二次经过纵向散射层22，此次对光线起到了垂直方向上的散射作用，使得垂直方向上的光线上下散开(不会左右散开，因为是纵向散射)，而对光线在水平方向上的传播路径不受影响，然后，光线第二次经过菲涅尔透镜21，再次产生汇聚作用，使得垂直方向上的光线平行射出，就如图4中的(a)所示，(a)为侧视图；而水平方向上的光线汇聚到空间某点，见于图4中的(b)，(b)为俯视图，从而光线在两次经过菲涅尔透镜后形成竖直窄带，在该点的用户才能观看到完整的画面。该竖直窄带投射到人的某一只眼睛，即仅有一只眼睛能接收到画面，而另一只没有，为了能够得到立体效果，需要开启另一台投影仪进行投影，假如开启投影仪12，并使投影仪12投影不同视角的图像或另一路视频，依据前述的成像过程，人的另一只眼接收到了来自投影仪12的画面，从而双眼看到了具有深度信息的画面，产生立体感，即裸眼3D。For ease of explanation, the imaging process of a projector is described first, taking projector 13 as an example: projector 13 is equivalent to a point light source, because the point light source is located on the focal plane of the vertical direction of Fresnel lens 21, so the point light source The distance from the Fresnel lens (i.e. the object distance u) is just equal to half of the vertical focal length f' of the Fresnel lens 21 (because the light is emitted in parallel after passing through the Fresnel lens twice, so only half-focus incidence is required. can achieve parallel exit). The light emitted by the projector 13 is incident on the Fresnel lens 21 in the form of divergence. After passing through the Fresnel lens 21 (passing for the first time), the light is horizontally emitted. Since the longitudinal scattering layer 22 is close to the specular reflection layer 23, the light When passing through the longitudinal scattering layer 22 for the first time, the longitudinal scattering layer 22 has no scattering effect on the light. After the light is reflected by the specular reflection layer 23, it passes through the longitudinal scattering layer 22 for the second time. The scattering effect on the vertical direction makes the light in the vertical direction spread up and down (it will not spread left and right, because it is longitudinal scattering), and the propagation path of the light in the horizontal direction is not affected, and then the light passes through Fresnel for the second time The Erlenmeyer lens 21 produces convergence again, so that the light rays in the vertical direction are emitted in parallel, as shown in (a) in Figure 4, (a) is a side view; and the light rays in the horizontal direction converge to a certain point in space, as shown in (b) and (b) in Figure 4 are top views, so that the light forms a vertical narrow band after passing through the Fresnel lens twice, and the user at this point can watch the complete picture. The vertical narrow band is projected to a certain eye of the person, that is, only one eye can receive the picture, and the other does not. In order to obtain a stereoscopic effect, another projector needs to be turned on for projection. If the projector 12 , and make the projector 12 project images of different viewing angles or another video, according to the aforementioned imaging process, the other eye of the person receives the picture from the projector 12, so that both eyes see the picture with depth information, resulting in a three-dimensional effect , namely glasses-free 3D.
在本发明中，菲涅尔透镜的参数设置必须保证垂直方向上的焦距f＇大于水平方向上的焦距f，即垂直方向上的曲率半径大于水平方向上的曲率半径，具体设置过程如下：In the present invention, the parameter setting of the Fresnel lens must ensure that the focal length f' in the vertical direction is greater than the focal length f in the horizontal direction, that is, the radius of curvature in the vertical direction is greater than the radius of curvature in the horizontal direction, and the specific setting process is as follows:
根据透镜成像公式：1/u+1/v＝1/f，为公式(1)，其中u为物距，在本发明中u也是菲涅尔透镜垂直方向的焦距，即u＝f＇，v为观察距离，可知：当v为正数，即观看者位于菲涅尔透镜与投影仪之间(即菲涅尔透镜凸面一侧)时(因为有反射层的存在，否则v为正数时，观察者应当是在透镜的另一侧)，u总是大于f的，所以，根据公式(1)，当已知其中两者时，可计算另一者的值，也就是前述描述的根据观看距离设置透镜参数，根据透镜参数和投影仪的位置也可以确定观察距离；According to lens imaging formula: 1/u+1/v=1/f, be formula (1), wherein u is object distance, and in the present invention u also is the focal length of Fresnel lens vertical direction, i.e. u=f ', v is the observation distance, it can be seen that when v is a positive number, that is, when the viewer is located between the Fresnel lens and the projector (that is, on the convex side of the Fresnel lens) (because there is a reflective layer, otherwise v is a positive number , the observer should be on the other side of the lens), u is always greater than f, so, according to formula (1), when two of them are known, the value of the other can be calculated, that is, the aforementioned Set the lens parameters according to the viewing distance, and the viewing distance can also be determined according to the lens parameters and the position of the projector;
例如，如图5所示，首先假设一个观看距离v＝3m(米)，观看角度为与菲涅尔透镜主光轴成30°，垂直方向焦距u(f＇)已知，从而根据公式(1)计算出水平方向焦距f，从而完成菲涅尔透镜的参数设置，确定显示屏，然后：For example, as shown in Figure 5, first assume a viewing distance v=3m (meter), the viewing angle is 30° with the main optical axis of the Fresnel lens, and the focal length u (f') in the vertical direction is known, so according to the formula ( 1) Calculate the focal length f in the horizontal direction, so as to complete the parameter setting of the Fresnel lens, determine the display screen, and then:
如图5所示：假设相邻投影仪之间的距离为E，人双眼的间距为e，为了能够感受到立体效果，除了前述的设置外，还需要保证相邻投影仪投射的画面两次经菲涅尔透镜出来之后，在观察距离处成像的间距E＇满足：As shown in Figure 5: Assuming that the distance between adjacent projectors is E, and the distance between human eyes is e, in order to be able to feel the stereoscopic effect, in addition to the aforementioned settings, it is also necessary to ensure that the images projected by adjacent projectors are twice After coming out of the Fresnel lens, the imaging distance E' at the observation distance satisfies:
e＝nE＇，n＝1,2,3...，此为公式(2)；e=nE', n=1,2,3..., this is formula (2);
例如：当u＝2f时，根据公式(1)，可得v＝2f，即观察距离v＝u，即在投影仪处进行观看，此种情况E＝E＇。取n＝1时，人眼分别看到投影仪11和12投射的画面，当n＝2时，人眼分别看到投影仪11和13的画面。For example: when u=2f, according to the formula (1), v=2f can be obtained, that is, the viewing distance v=u, that is, viewing at the projector, in this case E=E'. When n=1, the human eyes see the pictures projected by the projectors 11 and 12 respectively; when n=2, the human eyes see the pictures of the projectors 11 and 13 respectively.
此外，由于菲涅尔透镜成像为倒立实像，为了能够得到准确的显示画面，需要事先对视频或者图像源进行处理，使之左右翻转，才能得到的方向正确的画面。In addition, since the Fresnel lens is an inverted real image, in order to obtain an accurate display image, it is necessary to process the video or image source in advance and flip it left and right to obtain a correct image.
假设在没有纵向散射层的情况下，经过透镜作用之后，整幅画面变成了竖直的长条，在某个位置只能看到部分画面，就必须要对光线进行散射，使得不同的身高的人都能观看到图像，为了避免不同投影仪之间的光线串扰，就需要进行纵向散射，使得光线只在垂直方向上进行散射。Assuming that in the absence of a longitudinal scattering layer, after the lens effect, the entire picture becomes a vertical strip, and only a part of the picture can be seen at a certain position, it is necessary to scatter the light, so that different heights All people can watch the image, in order to avoid light crosstalk between different projectors, longitudinal scattering is required so that the light is only scattered in the vertical direction.
投影仪常常布置于屏幕下方，投影到垂直显示屏上的画面并非矩形，此时就需要对图像进行扭曲校正，而通常的投影仪投影校正能力有效，故而对于投影距离有限制，这种情形下，整个系统将占用较大的空间，为了减轻这一限制，本发明优选方案中采用具有较强校正能力的短焦距激光投影仪(如LGHECTO投影仪)，如此，则可以更加灵活的布置投影仪，甚至可以将投影仪直接布置于显示屏幕跟前，从而实现几乎完全自由地布置本立体投影显示装置。Projectors are often arranged below the screen, and the picture projected onto the vertical display screen is not rectangular. At this time, it is necessary to correct the distortion of the image, and the usual projection correction ability of the projector is effective, so there is a limit to the projection distance. In this case , the whole system will take up a large space. In order to alleviate this limitation, a short-focus laser projector (such as an LGHECTO projector) with strong correction capabilities is used in the preferred solution of the present invention. In this way, the projector can be arranged more flexibly , even the projector can be arranged directly in front of the display screen, so that the stereoscopic projection display device can be arranged almost completely freely.
而为了实现2D/3D可切换播放，有两种实现方式：最简单的一种是所有投影仪投影相同的图像，这样得到的效果比传统的二维显示较差，而且成本也要高于传统的二维显示系统；另外一种是在菲涅尔透镜层前增添一层可控水平散射膜，通过开关控制其散射特性：当需要2D显示时，此膜为水平散射膜，能将光线水平散射开来，使得任意位置均能看到画面，此时只需要打开一台投影仪即可；当需要3D显示时，此膜为透射膜，不进行任何散射，相当于不存在，此时所有投影仪都需要处于工作状态。In order to achieve 2D/3D switchable playback, there are two implementation methods: the simplest one is that all projectors project the same image, the effect obtained in this way is worse than traditional two-dimensional display, and the cost is also higher than traditional The other is to add a layer of controllable horizontal scattering film in front of the Fresnel lens layer, and control its scattering characteristics through switches: when 2D display is required, this film is a horizontal scattering film, which can level the light Scattering, so that the picture can be seen at any position. At this time, you only need to turn on a projector; when 3D display is required, this film is a transmission film, without any scattering, which is equivalent to non-existence. At this time, all Projectors need to be in working order.
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的技术人员来说，在不脱离本发明构思的前提下，还可以做出若干等同替代或明显变型，而且性能或用途相同，都应当视为属于本发明的保护范围。The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art to which the present invention belongs, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and those with the same performance or use should be deemed to belong to the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410234678.6ACN103995426B (en) | 2014-05-29 | 2014-05-29 | A kind of stereo projection display apparatus |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410234678.6ACN103995426B (en) | 2014-05-29 | 2014-05-29 | A kind of stereo projection display apparatus |
| Publication Number | Publication Date |
|---|---|
| CN103995426A CN103995426A (en) | 2014-08-20 |
| CN103995426Btrue CN103995426B (en) | 2015-11-18 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201410234678.6AExpired - Fee RelatedCN103995426B (en) | 2014-05-29 | 2014-05-29 | A kind of stereo projection display apparatus |
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