CN108254933A - A kind of naked-eye stereoscopic display system based on lenticulation - Google Patents

Abstract

An embodiment of the present invention provides a naked-eye stereoscopic display system based on a lens grating, including: an optical projector, a rear projection screen, and a lens grating plate, and the lens grating plate is arranged on the image display side of the rear projection screen; an optical projector for projecting a source image onto the rear projection screen, wherein the source image is a cross image of a left view and a right view, the left view and the right view having parallax; the rear projection screen , for displaying the source image projected by the optical projector. In the naked-eye stereoscopic display system based on lens grating provided by the embodiment of the present invention, the source image is projected onto the rear projection screen by an optical projector for projection, and the rear projection screen of any size is seamless, so that the source image is The rear projection screen of any size can be output without loss, therefore, the display quality of the naked-eye stereoscopic image can be realized through the system without being affected by the size of the screen.

Description

A naked-eye stereoscopic display system based on lens grating

technical field

The invention relates to the display field, in particular to a lens grating-based naked-eye stereoscopic display system.

Background technique

Naked-eye stereoscopic display technology is a stereoscopic display technology that does not require wearing glasses or other auxiliary devices. This technology presents stereoscopic images, which are divided into front-screen images and rear-screen images. In recent years, naked-eye stereoscopic display technology has developed very rapidly and has been widely used in different fields such as advertising, media, demonstration teaching, exhibition display, and film and television. At present, many well-known companies and research institutions at home and abroad have developed various small and medium-sized screen display terminals using naked-eye three-dimensional display technology, such as naked-eye three-dimensional game consoles, naked-eye three-dimensional tablet computers, and naked-eye three-dimensional mobile phones.

At present, naked-eye stereoscopic images are projected mainly on LED (Light-Emitting Diode, light-emitting diode) or LCD (Liquid Crystal Display, liquid crystal display) screens. Although on small and medium-sized LED or LCD screens, the display quality of naked-eye stereoscopic images is relatively high, but for large-sized LED or LCD screens obtained by splicing, the display quality of naked-eye stereoscopic images is low. In terms of: Due to the constraints of the splicing technology, a screen splicing gap of 3mm-7mm will be reserved, so that in the stereoscopic display, there will be a black line on the image behind the screen, and the black line will block the image in front of the screen, that is, the front screen and the screen. There are seam black lines with the same spatial distance on the rear screen, which causes the audience to visually confuse the distance between the front and rear images on the screen, resulting in visual contradictions.

It can be seen that, in the prior art, the display quality of the naked-eye stereoscopic image is affected by the size of the screen.

Contents of the invention

The object of the embodiments of the present invention is to provide a lens grating-based naked-eye stereoscopic display system, so as to achieve the purpose that the display quality of the naked-eye stereoscopic image is not affected by the size of the screen. The specific technical scheme is as follows:

An embodiment of the present invention provides a naked-eye stereoscopic display system based on a lens grating, including: an optical projector, a rear projection screen, and a lens grating plate, and the lens grating plate is arranged on the image display side of the rear projection screen;

The optical projector is used to project a source image to the rear projection screen, wherein the source image is a cross image of a left view and a right view, and the left view and the right view have parallax;

The rear projection screen is used to display the source image projected by the optical projector.

Optionally, the optical projector is a laser projector.

Optionally, the laser projector is a short-focus laser projector.

Optionally, the rear projection screen is made of a material that can transmit light and emit scattered light when light passes through.

Optionally, the material of the rear projection screen is resin containing acrylic acid.

Optionally, the lens grating plate is a lenticular lens grating plate.

Optionally, the material of the lens grating plate is tempered glass.

A lens-grating-based naked-eye stereoscopic display system provided by an embodiment of the present invention includes: an optical projector, a rear projection screen, and a lens grating plate arranged on the image display side of the rear projection screen. First, an optical projector is used to project the source image containing the left and right views to the rear projection screen for display, and then the lens grating plate is used to split the light of the image displayed on the rear projection screen to obtain a naked-eye stereoscopic display effect.

The rear projection screen of the present invention has a wide range of options and adopts an image display mode projected by an optical projector, which is different from the prior art method of splicing LED or LCD screens for naked-eye stereoscopic display. Compared with the prior art, in the naked-eye stereoscopic display system based on lens grating provided by the embodiment of the present invention, the source image is projected onto the rear projection screen by an optical projector for projection, and any size of the rear projection screen is wireless. slit, so that the source image can be output without loss on the rear projection screen of any size. Therefore, the display quality of the naked-eye stereoscopic picture can be realized through this system without being affected by the size of the screen.

Of course, implementing any product or method of the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural view of a lens grating-based naked-eye stereoscopic display system according to an embodiment of the present invention;

2 is a schematic structural view of a lens grating plate according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of the principle of the lenticular grating naked-eye stereoscopic display technology.

Detailed ways

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.

The real world is a three-dimensional world. The images seen by human eyes when looking at objects have positional deviations. The deviation between two images is called parallax. It is this kind of parallax that enables people to distinguish the distance of objects and obtain a sense of three-dimensionality. According to different parallax values, the parallax can be divided into positive parallax, negative parallax and zero parallax. When the audience is watching: Positive parallax makes people feel that the object goes deep into the screen; Negative parallax makes people feel that the object is floating outside the screen; Said zero plane. For example, the stars in the sky at night in summer are far away from us, and our line of sight for viewing each star is almost parallel. At this time, the parallax is close to zero. The same distance from us, the stars seem to have no three-dimensional effect on a plane.

The human brain is an extremely complex nervous system. It can combine two images with parallax reflected in the eyes, through the fusion reflection of the optic nerve center, and the visual psychological reaction, to produce a three-dimensional stereoscopic sensation. Utilizing this principle, two left and right views with parallax can be displayed on the display and split into light, and sent to the left and right eyes respectively, so as to obtain a three-dimensional effect and realize naked-eye three-dimensional display.

At present, the playback of naked-eye stereoscopic images mainly relies on LED or LCD screens for projection, and high display quality has been obtained on the naked-eye stereoscopic display of small and medium-sized screens. However, when a larger screen projection is required, multiple LED or LCD screens need to be spliced. Constrained by the splicing technology, a 3mm-7mm screen splicing gap will remain on the spliced screen, and the existence of the screen splicing gap makes the black line of the seam appear on the image behind the screen during the stereoscopic display, and the black line of the seam will block the screen The front image, that is, the front screen and the back screen have seam black lines with the same spatial distance, which causes the audience to visually confuse the distance between the front and rear images of the screen, resulting in visual contradictions. It can be seen that, in the prior art, the display quality of the naked-eye stereoscopic image is affected by the size of the screen.

The embodiment of the invention discloses a lens grating-based naked-eye three-dimensional display system, which can realize the purpose that the display quality of the naked-eye three-dimensional picture is not affected by the size of the screen. Details are given below.

FIG. 1 is a schematic structural diagram of a lens grating-based naked-eye stereoscopic display system provided by an embodiment of the present invention. As shown in FIG. 1 , the naked eye stereoscopic display system based on lens grating provided by the embodiment of the present invention may include an optical projector 101, a rear projection screen 102 and a lens grating plate 103, and the lens grating plate 103 is arranged on the rear The image display side of the projection screen 102; wherein,

The optical projector 101 is used to project the source image to the rear projection screen;

The rear projection screen 102 is used for displaying the source image projected by the optical projector 101 .

It should be emphasized that the dotted lines on the upper and lower sides of the optical projector 101 only represent the projection viewing angle range of the optical projector 101 , and do not have any limiting meaning.

The structure of the lens grating plate 103 is understood in conjunction with FIG. 2 , which is a schematic structural diagram of the lens grating plate according to an embodiment of the present invention. As shown in FIG. 2 , the lens grating plate 103 includes a lens grating 201 and a light-transmitting plate 202 , and the lens grating 201 is composed of a plurality of lenses. It should be noted that, in actual use, the materials of the lens grating 201 and the transparent plate 202 are the same, and the two are integrally formed into a lens grating plate. It should be emphasized that the dotted line in FIG. 2 is only used to distinguish the lens grating 201 from the light-transmitting plate 202 , and does not have any limiting meaning.

In order to facilitate the understanding of the solution, combined with the principle schematic diagram of the lens grating naked-eye stereoscopic display technology shown in Figure 3, the principle of the lens grating naked-eye stereoscopic display is introduced:

The principle of naked-eye stereoscopic display is generally to split the displayed image, so that human eyes receive different images with parallax, thus realizing stereoscopic display. The lens grating refracts different display content to different places in the space through the refraction of the lens to light. When it reaches the human eye, the displayed content is separated, and the human eye receives two images with parallax, thus producing a three-dimensional effect. As shown in FIG. 3 , a lens grating plate 302 is arranged in front of the display panel 301, and the optical principle of the lens grating is used to split light, so that the left and right eye images are refracted by the lens grating, and after a certain distance, the light rays reaching the human eyes are separated. The right eye 3031 receives the image formed by the light shown by the solid line, the left eye 3032 receives the image formed by the light shown by the dotted line, and both eyes receive two images with parallax, thereby producing a stereoscopic effect.

Each component in the naked-eye stereoscopic display system provided by the embodiment of the present application will be described in detail below.

The optical projector 101 stores a source image corresponding to a naked-eye stereoscopic picture to be displayed, wherein the source image is a cross image of a left view and a right view, and the left view and the right view have parallax. It can be understood that the encoding technology can be used in advance to encode and cross the left and right views, so as to obtain the source image, wherein the encoding technology used to generate the source image can be the encoding technology existing in the prior art, since it is not the The inventive points of the embodiments are not limited here. It should be noted that the positional relationship between the optical projector 101 and the rear projection screen 102 is a preset positional relationship, and the preset positional relationship includes the center of the optical projector 101 and the rear projection screen. 102, the distance between the center of the optical projector 101 and the edge of the rear projection screen 102, etc., and the preset positional relationship meets the imaging requirements of the optical projector.

In a specific application, the optical projector 101 may be a laser projector, since the laser projector has high brightness characteristics, it can improve the display brightness and display clarity of images. Specifically, the laser projector 101 may be a telephoto laser projector or a short-focus laser projector. Further, as a preferred embodiment, the laser projector may be a short-focus laser projector. Compared with a long-focus laser projector, a short-focus laser projector can reduce the volume of the entire display system. Wherein, the so-called short-focus laser projector refers to a laser projector with a throw ratio less than 1, and the so-called telephoto laser projector refers to a laser projector with a throw ratio greater than 1.

Wherein, the throw ratio is the ratio of the projection distance to the screen width. The smaller the throw ratio, it means that the same screen width is projected, and the required projection distance is shorter. For example, if the throw ratio of a projector is 1, then using this projector to project a 100-inch picture requires the projector lens to be 2.214 meters away from the projection screen. Early telephoto projectors required a projection distance of two to three meters to project a 100-inch screen, which required a longer projection distance. The recently developed short-throw projector products can reduce the projection distance to less than 2 meters, which can meet the needs of a wider range of venues, especially for home use.

It can be understood that the rear projection screen 102 is a screen used for rear projection. The current projection technology is divided into front projection and rear projection. The so-called front projection, simply put, is that the projector is installed on the same side as the audience on the screen, and the light emitted by the projector is projected onto the screen to form an image, and then the light is reflected. into people's eyes. Similarly, the so-called rear projection means that the installation position of the projector and the audience are respectively located on both sides of the screen. The light emitted by the projector is directly directed from one side of the screen to the screen, and the light enters people's eyes through the screen. Therefore, the rear projection screen requires extremely high light penetration and can image clearly. Rear projection can project a picture with the same image quality as a TV, but the projected area can be expanded to hundreds of times the developing area of a TV.

Specifically, the rear projection screen 102 is made of a material that can transmit light and emit scattered light when the light passes through it, such as a resin projection film made of acrylic and full-color filter crystals. The rear projection screen can be made transparent, Milky white, light gray, dark gray and other colors to achieve different display effects.

Further, as a preferred embodiment, the lens grating plate 103 may be a lenticular lens grating plate. That is to say, corresponding to the embodiment of the present invention, the lens grating 201 on the lens grating plate 103 is a lenticular lens grating composed of many small cylindrical lenses with identical structural parameters and performance.

In actual use, the material of the lens grating plate 103 may be tempered glass, PET (Polyethyleneterephthalate, polyethylene terephthalate) and the like. Among them, tempered glass not only has a high contrast ratio, but also has extremely low reflectivity to ambient light, and has extremely high light penetration, which can display excellent image color and better viewing angle.

It should be noted that, in the lens grating plate 103 , the thickness of the transparent plate 202 is the same as the focal length of the lens in the lens grating 201 . In actual use, the lens grating 201 and the light-transmitting plate 202 are integrally molded using the same material, and then the side of the light-transmitting plate 202 that is not pasted with the lens grating 201 is pasted to the back. The image display side of the projection screen 102 .

The rear projection screen of the present invention has a wide range of options and adopts an image display mode projected by an optical projector, which is different from the prior art method of splicing LED or LCD screens for naked-eye stereoscopic display. Compared with the prior art, in the naked-eye stereoscopic display system based on lens grating provided by the embodiment of the present invention, the source image is projected onto the rear projection screen by an optical projector for projection, and any size of the rear projection screen is wireless. slit, so that the source image can be output without loss on the rear projection screen of any size. Therefore, the display quality of the naked-eye stereoscopic picture can be realized through this system without being affected by the size of the screen.

In order to facilitate the understanding of the difference between the lens grating-based naked-eye stereoscopic display system provided in the embodiment of the present application and the prior art, an example is introduced below.

Take the construction of a display area with a length of 5.4 meters and a width of 2.4 meters as an example. The embodiment of the present invention is described: in the prior art, for the above-mentioned display area, twelve 50-inch LED screens need to be spliced in the form of three rows and four columns. A total of 17 screen splicing gaps in the shape of a grid will appear on the spliced screen, and at the same time, one-eighth of the image clarity will be lost. And the naked-eye three-dimensional display system based on the lens grating of the embodiment of the present invention uses a short-focus laser projector, a 5.4-meter-long, 2.4-meter-wide rear projection screen and a lens grating plate of the same size as the rear projection screen. The projection distance of 1.5 meters projects a display area of 5.4 meters long and 2.4 meters wide, and provides cinema-grade 4K clarity.

Moreover, if a traditional telephoto laser projector is used, a projection distance of 5-6 meters is required to project an equal display area. Therefore, compared with the long-focus laser projector, the use of the short-focus laser projector can reduce the volume of the display system in the embodiment of the present invention.

It can be seen that through the lens grating-based naked-eye stereoscopic display system provided in this embodiment, the display quality of the naked-eye stereoscopic image is not affected by the size of the screen.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a related manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, refer to part of the description of the method embodiment.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims (7)

1. A naked-eye stereoscopic display system based on a lens grating, characterized in that it comprises: an optical projector, a rear projection screen and a lens grating plate, and the lens grating plate is arranged on the image display side of the rear projection screen; The optical projector is used to project a source image to the rear projection screen, wherein the source image is a cross image of a left view and a right view, and the left view and the right view have parallax; The rear projection screen is used to display the source image projected by the optical projector. 2. The system of claim 1, wherein the optical projector is a laser projector. 3. The system according to claim 2, wherein the laser projector is a short-throw laser projector. 4. The system according to claim 1, wherein the rear projection screen is made of a material that can transmit light and emit scattered light when light passes through. 5. The system according to claim 4, wherein the rear projection screen is made of resin containing acrylic. 6. The system according to claim 1, wherein the lens grating plate is a lenticular lens grating plate. 7. The system according to claim 1, wherein the material of the lens grating plate is tempered glass.