Screenless display system and components and application thereof

Abstract

A no-screen display system and components and applications thereof relate to the field of electronics. The screen-free display system comprises a light source system and a light modulator, and is characterized by further comprising a holographic grating array, the holographic grating array comprises at least 10 holographic gratings; at least ten holographic gratings which are used for imaging incident surfaces and are arranged on the same side; imaging of at least ten holographic gratings is used as pixels for forming a display picture; the light source system adopts a laser light source system, and light of the laser light source system irradiates the holographic grating array after passing through the light modulator; in the imaging process, in the holographic grating array, the imaging condition of at least one holographic grating is matched with the laser modulated by the light modulator. According to the invention, no-screen imaging in the air can be realized, and the color of the image is not single.

Description

Technical Field

[0001] The present invention relates to the field of electronics, and more particularly to a display system. Background Art

[0002] Existing film and television systems all require a screen to carry images. The screen may be a liquid crystal screen, a silver screen, or may also be water vapor, a car window film, etc.

[0003] The position and size of the carried images are restricted by the screen itself. As a physical component, the screen itself also restricts the structure of the film and television playback system.

[0004] Laser holographic imaging technology can achieve screenless imaging in the air. Laser holographic imaging is a technology that uses laser light to irradiate a grating to form an image in the air. This technology has a single imaging color, and the holographic grating cannot be optically modulated, so it cannot be used for film and television playback. In addition, the image formed by this technology is dark in brightness and has a lot of stray light, which is also an important problem that is difficult to overcome. Summary of the Invention

[0005] An object of the present invention is to provide a screenless display system to solve at least one of the above technical problems.

[0006] An object of the present invention is to provide an invisible device using a screenless display system.

[0007] An object of the present invention is to provide a holographic grating array applied to screenless imaging.

[0008] An object of the present invention is to provide a lenticular grating applied to screenless imaging.

[0009] The technical problems solved by the present invention can be achieved by the following technical solutions:

[0010] A screenless display system, including a light source system and a light modulator, is characterized in that: it further includes a holographic grating array; the holographic grating array includes at least 10 holographic gratings; the incident surfaces for imaging of at least 10 holographic gratings are on the same side; the images formed by at least 10 holographic gratings are used as pixels constituting the display screen; the light source system adopts a laser light source system, and the light of the laser light source system is irradiated onto the holographic grating array after passing through the light modulator; during the imaging process, among the holographic grating array, the imaging conditions of at least 1 holographic grating match the laser light modulated by the light modulator.

[0011] An invisible device using a screenless display system, including a computer control system, the computer control system is connected to the screenless display system; the computer control system projects an image onto the front of an object to be made invisible through the screenless display system to block the object, thereby making it invisible.

[0012] A holographic grating array applied to screenless imaging includes at least 10 holographic gratings; the arrangement of the at least 10 holographic gratings is such that the light incident surfaces for imaging under incident light irradiation are on the same side; the imaging positions of the at least 10 holographic gratings are arranged on the same plane.

[0013] A lens-type grating includes a lens mechanism that converges coherent laser light to a point to generate an interference image point, using the image point as a pixel; at least 10 holographic gratings are arranged into a holographic grating array.

[0014] Advantageous effects: The present invention can perform screenless imaging in the air, and the color of the image presented is not single. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of an arrangement of the holographic grating array;

[0016] Figure 2 It is an optical path diagram of a screenless display system;

[0017] Figure 3 It is another optical path diagram of a screenless display system;

[0018] Figure 4 It is another schematic diagram of an arrangement of the holographic grating array;

[0019] Figure 5 It is another optical path diagram of a screenless display system;

[0020] Figure 6 It is an optical path diagram of the holographic grating array;

[0021] Figure 7 It is another optical path diagram of a screenless display system;

[0022] Figure 8 It is a schematic diagram of an imaging surface;

[0023] Figure 9 It is another schematic diagram of an imaging surface;

[0024] Figure 10 It is an optical path diagram of the holographic grating array. Detailed Embodiments

[0025] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0026] Refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7, Figure 8 , Figure 9 , Figure 10 , a screenless display system mainly includes a light source system 17, a light modulator, and a holographic grating array.

[0027] Regarding the light source system 17

[0028] Reference Figure 5 , Figure 7 , the laser light source system includes three lasers, and the three lasers are respectively lasers that emit one of the three primary color lights. The one that emits one of the three primary color lights is called the first color laser 14; the one that emits another color light among the three primary colors is called the second color laser 12. The one that emits still another color light among the three primary colors is called the third color laser 13. The three lasers are collectively called the three-primary-color laser group.

[0029] Reference Figure 2 , Figure 3 , the light emission directions of the three lasers in the three-primary-color laser group are arranged in parallel. Behind the three-primary-color laser group, a light mixing optical component, an expanding optical component, a light modulator, and a holographic grating array are sequentially arranged in the optical path direction. The laser beams emitted by the three lasers are mixed by the light mixing optical component 4 to become a combined light laser beam, and then are expanded by the expanding optical component. The expanded laser beam irradiates the light modulator 5, and after passing through the light modulator 5, it is controlled to be decomposed into finer laser beams, maintaining the laser characteristics, and irradiates the holographic grating array to complete the controlled imaging.

[0030] Regarding the light modulator

[0031] The light modulator is a device that controls (also called modulates) light in a controlled manner to assist in imaging. In the present invention, it is required that the laser still has the ability to form an image in the air by the holographic grating after being modulated by the light modulator. That is to say, it is required that the light modulator can maintain some important characteristics of the laser. Refer to Figure 2 , Figure 3 , Figure 5 , Figure 7 , the light is modulated by the light modulator to complete the screen display. The imaging conditions of at least 1 holographic grating match the laser after being modulated by the light modulator, so that the light modulator can control at least one pixel 8 for display in one operation.

[0032] The optical modulator selects a liquid crystal optical modulator in which the laser remains coherent after transmission. Note: Liquid crystal optical modulators are widely used in existing projection devices. They have the advantages of simple optical path structure and low cost. In general, liquid crystal optical modulators will destroy the coherence of the laser due to their astigmatic characteristics, thus making holographic imaging impossible. A liquid crystal optical modulator with low impurity content and strong crystal orientation consistency during controlled light transmission should be selected. The crystal orientation consistency can be improved by increasing the control voltage. Refer to Figure 2 。

[0033] Preferably, a liquid crystal optical modulator that is opaque without voltage loading and transparent with voltage loading is selected, providing conditions for improving the light transmission effect by applying voltage. Preferably, the optical modulator selects a liquid crystal optical modulator that does not have a brightness control function but only has a light on / off control function, so as to avoid the crystal orientation of the liquid crystal being disordered due to brightness control, thereby destroying the coherence of the laser and ensuring effective imaging. When controlling the brightness, the crystal orientation of the liquid crystal is relatively disordered, which will destroy the coherence of the laser. The "not having a brightness control function" defined in the present invention is not limited to the limitation of hardware. Limiting the function to this through software also conforms to the limitation of the present invention. For example, regardless of whether the hardware has a brightness control function, as long as the brightness control function is not effectively used during normal effective screenless imaging, it is considered not to have a brightness control function. Refer to Figure 2 。In practical technologies, there is no absolute light on / off. In the present invention, the light on / off is based on whether light is allowed to pass through to form a visible image.

[0034] Refer to Figure 3 、 5 、7, the optical modulator adopts a reflective optical modulator 9. Reflective optical modulators are widely used in existing projection devices. In the present invention, reflective optical modulators have some advantages compared with liquid crystal optical modulators.

[0035] The optical path structure and the self-structure of the optical modulator are both relatively simple, and the cost is low. However, in the present invention, it is required that the laser remains coherent after transmission, which requires relatively high performance such as light transmittance, purity, controllability, and heat resistance of the liquid crystal, so that almost no scattering occurs during light transmission. These performance technical difficulties are relatively high. A reflective optical modulator is an optical modulator that controls whether light is reflected and emitted by controlling the movement of a reflective device. Although the optical path structure and the self-structure are relatively complex, since the light is controlled by reflection, it is easy to meet the requirement in the present invention that the laser remains coherent after transmission, with low implementation difficulty and stable performance.

[0036] Regarding the holographic grating array 6

[0037] The holographic grating array 6 includes at least 10 holographic gratings; the incident surfaces of the at least 10 holographic gratings for imaging are on the same side. The images formed by the at least 10 holographic gratings are used as pixels constituting the display screen: the display screen is located in the air without a carrier screen, and the light source system uses a laser light source system. The light of the laser light source system is irradiated onto the holographic grating array after passing through an optical modulator. During the imaging process, in the holographic grating array, the imaging conditions of at least 1 holographic grating match the laser modulated by the optical modulator.

[0038] Preferably, the holographic grating array includes at least 3 groups of gratings. The holographic gratings in the 3 groups of gratings are respectively gratings that image as three primary color images. The 3 groups of gratings are the first colored grating 1, the second colored grating 2, and the third colored grating 3. Each group of gratings includes at least 10 holographic gratings; at least 10 images formed by the at least 10 holographic gratings of the first grating, at least 10 images formed by the at least 10 holographic gratings of the second group of gratings, and at least 10 images formed by the at least 10 holographic gratings of the third group of gratings are respectively superimposed or overlapped to form at least 10 color images, and the color images are used as color pixels. The imaging superposition or overlap means superposition or overlap visually, and there is a slight deviation allowed in the positions of each monochromatic image. For example, the superposition or overlap of the three primary color pixels of a TV does not require them to coincide exactly, but is superposition or overlap visually. Refer to Figure 1 、 Figure 4 , and it is not limited to only the gratings and lasers that image as three primary color images, and more other primary colors can also be added.

[0039] The holographic gratings in the first colored grating, the second colored grating, and the third colored grating are arranged staggeredly, and the holographic gratings with overlapping imaging are adjacent to each other. The holographic gratings with overlapping imaging being adjacent to each other facilitates a unified light environment during the irradiation of mixed light and is beneficial to improving the imaging quality. Refer to Figure 1 。

[0040] Each of the three lasers in the three - primary - color laser group uses a line - shaped laser. An optical modulator and a collimating optical device are respectively arranged in the optical path direction. The front - back positions of the optical modulator and the collimating optical device are not limited; a holographic grating array is arranged further behind; the holographic grating array includes three groups of colored grating arrays, and the three groups of colored grating arrays are three groups of colored grating arrays respectively corresponding to the three lasers in the three - primary - color laser group; the three groups of colored grating arrays are arranged in sub - regions and are respectively arranged in the irradiable regions corresponding to their respective lasers. The collimating optical device is an optical device that converges divergent light into parallel light, and it can be a collimating lens or a collimating lens group. After the light of the line - shaped laser passes through the collimating optical device, it becomes a parallel light with a width or a length. The colored grating array is irradiated by the corresponding laser and forms an image in the air. This grating array is arranged in sub - regions, has stronger anti - interference ability and better imaging effect. Because there is no need for mixing light, the light utilization rate is increased by more than twice. The line - shaped laser is also called a linear laser or a one - line laser, and when projected onto a screen from the front, it is a one - line.

[0041] The imaging area of the holographic grating is at least larger than the projected area of two laser beams formed after being modulated by the optical modulator; at least two parallel laser beams modulated by the optical modulator are allowed to simultaneously irradiate on the imaging area of a full - holographic grating; thus, the brightness of the image formed by the holographic grating, that is, the pixel brightness, can be controlled by controlling the number of laser beams irradiating on a holographic grating by the optical modulator. The optical modulator can control the brightness of each part of the imaged image without having to modulate the brightness of the laser beam, so that the liquid - crystal optical modulator can be used in the system of the present invention without complex technical upgrading, and the requirements for the reflective optical modulator and the laser control system are also reduced.

[0042] Solution 1: Set up an optical modulator; the laser beams of the three lasers irradiate at different positions of the optical modulator; the laser beams of the three lasers form three groups of thinner laser beams after being modulated by the optical modulator. The three groups of thinner laser beams are respectively irradiated onto three groups of colored grating arrays of corresponding colors. Modulating the three laser beams with one optical modulator has the advantages of simple structure and easy control. The corresponding color does not mean that the grating has a color, but rather it matches the imaging after being irradiated by the light of the corresponding color.

[0043] Solution 2: Set up three optical modulators, and the laser beams of the three lasers are respectively irradiated onto three different optical modulators; the laser beams modulated by the three optical modulators are respectively irradiated onto three groups of colored grating arrays of corresponding colors. This design is convenient for improving pixels and imaging brightness. The holographic grating array can be integrated or split, such as being split into three pieces. If a collimating optical device, such as a collimating lens or a collimating lens group, needs to be arranged on the optical path after the three lasers.

[0044] It is possible to have three lasers sharing one collimating optical device. It is also possible to set up collimating optical devices separately for each laser, that is, to set up three collimating optical devices. This can be determined according to the design requirements. Three collimating optical devices are particularly suitable for a structure in which the holographic grating array is divided into three parts. One collimating optical device is particularly suitable for an integrated structure of the holographic grating array.

[0045] The optical modulator has controlled optical modulation points, and the optical modulation points control whether the light incident on the optical modulator is effectively emitted. The effective imaging area of a holographic grating in the holographic grating array corresponds to the emitted light rays of at least three optical modulation points; at least three laser beams passing through at least three optical modulation points are allowed to simultaneously irradiate the imaging area of a holographic grating. By adjusting the number of laser beams irradiating a single holographic grating in the holographic grating array, the imaging brightness is controlled.

[0046] The imaging viewing angle of the screenless display system is set so as not to directly view the position of the holographic grating array. Or it can be written as: The projection imaging angle of the screenless display system is set so as not to directly face the viewer (audience).

[0047] Note: Reduce or avoid light leakage of the holographic grating to interfere with the viewing effect.

[0048] Preferably, the holographic grating array of the screenless display system is located above, and the imaging position is located below, presenting a vertical screen. A vertical screen is convenient for people to view vertically. The vertical reference direction can be vertical along the direction of gravity or vertical perpendicular to the ground. Of course, tilted or toppled objects can also be displayed in the vertical screen. TVs and movies generally also use vertical screens.

[0049] The screenless display system can be provided with a computer control system. The computer control system is connected to an environmental structure scanning system for obtaining and controlling the connection to the screenless display system. After scanning the environmental structure through the environmental structure scanning system, the computer control system combines the display content of the screenless display system with the environmental structure. The computer control system is also connected to a camera device to capture the combined image of the displayed content and the environment, so as to feedback the combined effect to the computer control system to improve the combined effect. The environmental structure scanning system can be a laser scanning system or an ultrasonic scanning system. Through camera feedback, the computer adjusts the display content, the position or size of the display content.

[0050] The area in space where the screenless display system has imaging ability is called the spatial imaging area. At least part of the spatial imaging area exceeds the restricted area formed by the environmental structure; at least part of the restricted area is restricted; to allow part of the imaging area to be combined with at least part of the environmental structure. The computer control system controls the position of the presented image by selecting the spatial imaging area, and then combines the display content with the environmental structure. The environmental structure can be a visible structured object within a region. Such as people, tables, chairs, walls, ceilings, cars, containers, etc.

[0051] For the projection screen of current projection devices, the way of combining with the environmental structure often involves focusing the lens. For example, the screen is projected onto a wall or ceiling by focusing. However, in the present invention, there is no adjustable-focus lens and thus no focusing can be performed. By selecting the spatial imaging area, the problem of inability to focus is solved. Additionally, since no focusing is required, multiple images formed by a screenless display system in space can be combined with multiple environmental structures at different distances without distortion. This is impossible or very difficult for traditional imaging systems to achieve.

[0052] The stealth device using a screenless display system mainly includes a computer control system and a screenless display system. The computer control system is connected to a screenless display system. The computer control system projects an image of a picture onto the front of an object to be stealth through the screenless display system to block the object and thus achieve stealth. The computer control system is also connected to a camera system. The camera system captures the picture behind the object to be stealth and projects the image of the picture onto the front of the object to be stealth through the screenless display system to block the object and thus achieve stealth.

[0053] The holographic grating array applied to screenless imaging, the holographic grating array includes at least 10 holographic gratings. The arrangement of at least 10 holographic gratings is such that the light incident surfaces for imaging under incident light irradiation are on the same side. The imaging positions of at least 10 holographic gratings are arranged on the same plane. The imaging positions are arranged on the same plane, and the images formed can be arranged on the same plane or on the same curved surface. For example, arranged on an arc surface. Arranged on an arc surface is beneficial for presenting a three-dimensional effect.

[0054] The holographic grating array is not limited to having only at least 10 holographic gratings. Other structures are allowed between the holographic gratings. The light incident surfaces are on the same side to facilitate the laser light source to illuminate the simplified structure on the same side. The imaging being on the same plane means that when viewed at the viewing distance, visually it is on the same plane, rather than a strictly defined plane in geometry. Refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 , the plane on which the imaging positions are arranged is called the imaging plane 7.

[0055] The images formed by the holographic gratings in the holographic grating array are combined to form the picture to be presented, completing the display. By selectively illuminating each holographic grating with laser light matching the holographic grating, controlling the images presented in the air, and using the images as pixels to form a picture, the display is completed, achieving the screenless display effect.

[0056] The holographic grating array applied to screenless imaging includes a group of at least 10 holographic gratings whose images are located in one plane, and another group of at least 10 holographic gratings whose images are located in another plane; the one plane intersects with the other plane. Screenless stereoscopic imaging can be achieved by intersecting at least two imaging planes. In order to improve the imaging effect, the angle between the planes can be adjusted. For example, it can be adjusted to 90 degrees, referring to Figure 8 .

[0057] Preferably, the holographic grating array includes at least 10 grating groups; each grating group includes at least 10 holographic gratings, and the imaging positions of at least 10 holographic gratings are arranged on a plane, and the arranged plane is called an imaging plane; at least 10 imaging planes of at least 10 grating groups are parallel, and arranged up and down or front and back; through controllable imaging in three-dimensional space, the pixels are controllable and combined into a three-dimensional image to be displayed. By superimposing at least 10 imaging planes in parallel, the imaging at each location in a three-dimensional space is controllable, that is, the pixels at each location are controllable, and thus the pixels in the three-dimensional space are controllable. Screenless three-dimensional imaging can be presented. The controllable pixels in the three-dimensional space are combined into a three-dimensional image, refer to Figure 9 .

[0058] Preferably, the holographic grating array includes at least three groups of gratings, which are divided into a first colored grating, a second colored grating, and a third colored grating according to different imaging colors, and each group of gratings includes at least 10 holographic gratings respectively; wherein the holographic gratings in the three groups of gratings are gratings that are imaged as different color images in the three primary colors; the positions of at least 10 images of one primary color formed by at least 10 holographic gratings of the first colored grating. The positions of at least 10 images of another primary color formed by at least 10 holographic gratings of the second colored grating, and the positions of at least 10 images of another primary color formed by at least 10 holographic gratings of the third colored grating are respectively overlapped or superimposed to allow at least 10 color images to be formed as color pixels. The overlap or superposition of imaging positions refers to visual overlap or superposition. The positions are allowed to have slight deviations in geometric relationships. For example, the overlap or superposition of the three primary color image points of a television does not overlap, but overlaps or superimposes visually.

[0059] refer to Figure 1 , Figure 4 The holographic gratings in the three groups of gratings are arranged in a staggered manner, and the holographic gratings with overlapping imaging positions are adjacent to each other. This is convenient for uniform light environment when imaging with mixed light, which is beneficial to improving imaging quality. Figure 1 .

[0060] The imaging area of the holographic grating is at least larger than the projection area of two laser beams modulated by the optical modulator, allowing the number of laser beams from the illumination area to the imaging area to be controlled by the optical modulator, thereby controlling the imaging brightness, i.e., the pixel brightness. This design can control the pixel brightness on the premise that the brightness of the laser light source remains unchanged. It can avoid the scattering that occurs during the process of adjusting the brightness by the transmittance when using a liquid crystal optical modulator, which destroys the laser characteristics and affects the imaging. The two laser beams irradiate different positions in the imaging area, and the holographic characteristics are used to control the brightness. The optical modulator is a mechanism for modulating the imaging light.

[0061] The holographic grating has a grating with a three-dimensional picture as the imaging pattern, and the three-dimensional picture is used as a pixel. Explanation: By using the three-dimensional picture as a pixel, the display screen can be viewed from multiple directions. The holographic grating array is arranged on a transparent plate. At least one group of holographic gratings is arranged on the transparent plate, and one group of holographic gratings includes at least 10 holographic gratings with imaging positions on the same surface. Explanation: The same surface can be the same plane or the same arc surface, and this surface is called the imaging surface.

[0062] The first colored grating 1, the second colored grating 2, and the third colored grating 3 are arranged in sub-regions. The sub-regional arrangement is such that laser beams of different corresponding colors can be respectively irradiated onto corresponding different regions. On the basis of allowing the simplification of the optical system, the hardware and process of synthesizing light and filtering light can be eliminated, improving the light utilization rate, reducing the heat generation, and reducing the risk of grating deformation caused by excessive temperature. Refer to Figure 4 .

[0063] A light-shielding structure 11 is provided between two adjacent colored grating arrays. Refer to Figure 4 , while allowing the laser beams of the corresponding color to fully irradiate the corresponding region, avoiding optical interference with other grating arrays in adjacent regions, ensuring that the grating array in one region is fully illuminated by light, avoiding interference with the grating arrays in adjacent regions, and also avoiding or reducing light leakage. The light-shielding structure can be planar or convex towards the optical modulator.

[0064] The first colored grating, the second colored grating, and the third colored grating are respectively arranged in the left, middle, and right regions. This facilitates the use of three linear lasers to irradiate the optical modulator without light synthesis, and after collimation, irradiate the holographic grating array. The light utilization rate is higher, the imaging interference is lower, and the structure is simpler. The collimation process can be before the laser irradiates the optical modulator or after the optical modulator emits light. The description of the left, middle, and right regions only defines the arrangement order and does not limit the specific orientation. After changing the viewing angle, the left, middle, and right may also visually appear as the upper, middle, and lower.

[0065] The regions where the first colored grating, the second colored grating, and the third colored grating are located are parallel rectangles. The use of a rectangular or strip-shaped grating array is more suitable for the optical structure of a linear laser, improving the imaging effect. A linear laser is also called a one-line laser or a single-line laser.

[0066] The regions where the first colored grating, the second colored grating, and the third colored grating are located are strip-shaped and parallel to each other. The parallel strip shape is more suitable for the optical characteristics of a linear laser.

[0067] The holographic grating uses a light-shielding stripe grating. The light-shielding stripe grating is a commonly used laser holographic imaging grating. The holographic grating can use a lens-type grating.

[0068] The lens-type grating includes a lens mechanism that converges coherent laser light to a point to generate interference and form an image point, using the image point as a pixel; at least 10 holographic gratings are arranged in a holographic grating array. By using convergent coherence, compared with the coherent imaging of the light-shielding stripe type, the light utilization rate is greatly improved. At a distance of 50 cm, it can be increased by more than 100 times. And the improvement factor is higher the farther away. Other gratings that can form an image in the air can also be used as the holographic grating, refer to Figure 6 。

[0069] Refer to Figure 6 、 10 ,The lens-type grating is also provided with an optical path difference adjustment mechanism; in the optical path direction, a laser beam is split into two laser beams with an optical path difference after passing through the optical path difference adjustment mechanism. After the two laser beams with an optical path difference are irradiated onto the lens mechanism, they converge to a point to form an image point; the optical path difference adjustment mechanism adjusts the optical path difference of the two laser beams to be coherent at the image point, making the image point visible as a pixel.

[0070] The optical path difference adjustment mechanism, refer to Figure 6 , includes a semi-transmissive and semi-reflective film 16 and a reflective film or reflective layer 10. A laser beam is split into two beams after passing through the semi-transmissive and semi-reflective film. One beam directly irradiates the lens mechanism 16, and the other beam forms an optical path difference after passing through a certain distance and then is reflected to the lens mechanism. The optical path difference adjustment mechanism can also be other structures. The optical path difference adjustment mechanism and the lens mechanism are formed on the same transparent plate to form a lens-type grating, and there are at least 10 lens-type gratings on the transparent plate. By forming the optical path difference adjustment mechanism and the lens mechanism on the same transparent plate, an integrated structure is realized. A modular component is achieved. The mutual structure is more stable, reducing external interference, and the production efficiency is improved and the cost is reduced because the assembly of small and precise components can be avoided during the overall assembly stage in production. Generating a large number of lens-type gratings on the same transparent plate further increases the above advantages.

[0071] The lens mechanism is formed on the transparent plate, and the optical path difference adjustment mechanism is embedded inside the transparent plate. The air in the optical propagation path of the optical path difference adjustment mechanism and the optical propagation path to the lens mechanism is removed, so as to improve the optical precision during the light transmission process and enhance the anti-interference ability. For example, the abilities to resist dust, air flow, and uneven humidity are all increased.

[0072] Such as Figure 10 , a lens type grating is provided with two optical path difference adjustment mechanisms; a laser beam is split into two laser beams after passing through a half-reflective and half-transmissive film; after the two laser beams pass through the two optical path difference adjustment mechanisms respectively for optical path difference adjustment, they are split into four laser beams; the four laser beams reach a lens mechanism and converge at a point to form an image point as a pixel; the adjustment relationship of the optical path differences of the two optical path difference adjustment mechanisms is that at least two groups of the four laser beams are coherent. The four laser beams are respectively A, B, C, and D. It can be that AB is coherent, CD is coherent, or ABC is coherent, BCD is coherent, or even ABCD are all coherent. To make the light rays at the image point lose their original directivity as much as possible under the coherent action, so that the image point is close to a point light source and becomes a pixel as clear as possible. The four laser positions irradiated on the lens mechanism are preferably not on the same straight line. Further preferably, they are evenly distributed in a quadrilateral shape to facilitate the image point being more approximate to a point light source.

[0073] In the specific design, relative to Figure 6 , 10 the structure in, more structural details can be added.

[0074] It includes a holographic grating array plate, and the holographic grating array is arranged on the holographic grating array plate. The holographic grating array plate is in a plate body or sheet body structure. There is no substantial difference in optical properties between the plate body and the sheet body. The plate body or sheet body structure is adopted. It allows the laser to be incident in the same direction, facilitating the layout of the laser system. The integrated structure is convenient for production and has stronger anti-interference ability.

[0075] At least 10 holographic gratings with imaging positions arranged on the same plane form a grating array on one plane; the holographic grating array includes at least one grating array; one grating array includes at least three groups of colored grating arrays; each of the three groups of colored grating arrays includes at least 10 holographic gratings whose imaging positions are on the same plane and are for three-dimensional image pixels: the colored grating array with an imaging color being one of the three primary colors is called the first colored grating and includes at least 10 holographic gratings; the colored grating array with an imaging color being another of the three primary colors is called the second colored grating and includes at least 10 holographic gratings; the colored grating array with an imaging color being yet another of the three primary colors is called the third colored grating and includes at least 10 holographic gratings; the imaging positions of at least 10 holographic gratings in the first colored grating, the imaging positions of at least 10 holographic gratings in the second colored grating, and the imaging positions of at least 10 holographic gratings in the third colored grating are respectively superposed with each other to allow the presentation of at least 10 color pixels. The respective superposition means visual superposition, not limited to physical position overlap, subject to visually presenting color pixels. Through the three-primary-color three-dimensional pixel setting, a color image that is convenient for multi-directional viewing can be presented. There are more than one combination ways of the three primary colors, and other more primary colors can be added on the basis of the three primary colors. The combination of the three primary colors and the number of added primary colors are prior arts.

[0076] At least 10 holographic gratings in the holographic grating array are arranged on a glass plate; the holographic gratings are arranged on the glass plate in at least one of the forms of printing, inlaying, engraving, and etching. The inlay structure can protect the holographic gratings, is also convenient for external cleaning, and can effectively cope with the temperature rise caused by light illumination.

[0077] The imaging positions of at least two holographic gratings in at least one group of colored gratings overlap; by controlling the number of holographic gratings with overlapping imaging positions illuminated, the imaging brightness is adjusted. This can avoid the overall picture disharmony caused by adjusting the brightness of the laser light source, avoid the scattering effect of the incomplete switching of the liquid crystal light modulator on imaging, avoid the high technical difficulty of adjusting the brightness of each laser beam, and is also convenient for obtaining higher brightness.

[0078] The imaging area of the holographic grating is at least larger than the projection area of the three laser beams that irradiate the imaging area to cause imaging; at least three laser beams are allowed to simultaneously irradiate the imaging area of a holographic grating; the imaging brightness of the holographic grating is controlled by controlling the number of laser beams. This can avoid the potential mutual interference caused by the superposition imaging of multiple holographic gratings in the same wavelength band.

[0079] The first colored grating, the second colored grating, and the third colored grating are respectively provided with filter layers of corresponding colors; the filter layers are located on the incident side of the imaging light of the holographic grating. The filter layer can filter out effective incident light of a specific color for imaging from the incident synthetic light, thereby presenting pixels of the desired color and avoiding various light interferences. The above design can simplify the optical system and reduce the workload or number of light modulators. Furthermore, this design facilitates the staggered arrangement of grating arrays of various colors on the same carrier, which facilitates the precision control of the superposition of the three primary colors in the air. In particular, it avoids the offset of grating arrays of various colors due to different heating. The filter layer is located on the incident side, which can eliminate stray light before optical effects such as interference and diffraction occur, which is beneficial to imaging.

[0080] The holographic grating is a holographic grating whose imaging pattern is a three-dimensional picture, and the three-dimensional picture is used as a pixel. Multiple three-dimensional pictures are presented as pixels at different positions in a screenless state, and are combined into a picture to be displayed that is visible from multiple perspectives. The holographic grating is a holographic grating whose imaging pattern is a cubic picture of at least one of a sphere, a polyhedron, and a cylinder. The holographic grating array of the screenless display system is located obliquely above the imaging position, at a height of more than two meters above the floor, and projects the picture toward the oblique space below. The environmental structure scanning system adopts a laser scanning system, and the inductive sensor system of the laser scanning system is located above and at a height of more than two meters above the floor. An interactive software system for controlling the interaction between the display picture and the human body is running in the computer control system; the interactive software system obtains the human body position or / and action information through the environmental structure scanning system, and adjusts the display content in the display picture, as well as the position of the displayed object or / and the action of the displayed object according to the information obtained. The interactive software system can be a game software system, a conference system, a work simulation system, and other systems. Setting it above two meters can avoid occlusion and avoid direct light to the human eye as much as possible. It can achieve the effect of natural interaction with virtual objects presented in the air without wearing glasses or holding handles, enhancing intuitive realism and avoiding dizziness.

[0081] A laser scanning system's inductive sensor system, a camera device and a holographic grating array are arranged in the same housing to form a scanning display system; at least two scanning display systems are arranged in a room; at least two scanning display systems are connected to the same computer control system; at least two scanning display systems are arranged at a height of more than two meters in the room and arranged diagonally; the sensing information and display images of at least two scanning display systems are integrated through a computer control system to interact with the same interactive software system in the room. Arranging in the same housing facilitates unified calibration. Arranging in a diagonal state, such as arranging at two diagonally opposite corners under the ceiling of the room, can be supplemented by the other party in terms of sensing and display when there is occlusion, which has complementary and verification effects. In addition, it is convenient to expand the effective sensing and display coverage space.

[0082] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A screenless display system, comprising a light source system and a light modulator, characterized in that : Also includes holographic grating arrays; The holographic grating array comprises at least 10 holographic gratings; at least 10 holographic gratings are used for the incident surface of imaging, which are on the same side; Using images of at least 10 holographic gratings as pixels constituting a display screen; The light source system adopts a laser light source system, and the light of the laser light source system irradiates the holographic grating array after passing through the light modulator; During the imaging process, the imaging condition of at least one holographic grating in the holographic grating array matches the laser modulated by the light modulator.

2. The screenless display system according to claim 1, characterized in that: The imaging viewing angle of the screenless display system is set to not directly look at the holographic grating array position.

3. The screenless display system according to claim 1, characterized in that: The holographic grating array of the screenless display system is located at the bottom, the imaging position is located at the top, and a vertical picture is presented.

4. The screenless display system according to claim 1, characterized in that: A computer control system is also provided, the computer control system is connected to a scanning system for obtaining environmental structures and controlling the connection to the screenless display system; The computer control system combines the display content of the screenless display system with the environmental structure after scanning the environmental structure through the environmental structure scanning system.

5. The screenless display system according to claim 4, characterized in that: The computer control system is also connected to a camera device to capture a combined picture of the displayed content and the environment.

6. The screenless display system according to claim 4, characterized in that: The area in space where the screenless display system has imaging capability is called the spatial imaging area, and the spatial imaging area at least partially transcends the environment structure; at least partially restricts the area; to allow part of the imaging area to be combined with at least part of the environment structure; The computer control system controls the position of the presented image by selecting the spatial imaging area, thereby combining the displayed content with the environmental structure.

7. The screenless display system according to claim 4, characterized in that: The holographic grating array is located diagonally above the imaging position, more than two meters above the floor, and projects the image diagonally downward. The environmental structure scanning system uses a laser scanning system, and the induction sensor system of the laser scanning system is located above and two meters above the floor; An interactive software system for controlling the interaction between the display screen and the human body is running in the computer control system; The interactive software system obtains the position and / or movement information of the human body through the environment structure scanning system, and adjusts the display content in the display screen, as well as the position and / or movement of the displayed object according to the obtained information.

8. The screenless display system according to claim 7, characterized in that: A sensing sensor system of a laser scanning system, a camera device and a holographic grating array are arranged in the same housing to form a scanning display system; At least two scanning display systems are arranged in a room; at least two scanning display systems are connected to the same computer control system; At least two scanning display systems are set up at a height of more than two meters in the room and arranged diagonally; The sensor information and display images of at least two scanning display systems are integrated through a computer control system to interact with the same interactive software system in the room.

9. The screenless display system according to claim 1, characterized in that: The light modulator is a liquid crystal light modulator that can keep the laser coherence after transmission.

10. The screenless display system according to claim 9, characterized in that: The liquid crystal light modulator is a liquid crystal light modulator that is opaque when no voltage is applied and is transmissive when voltage is applied.

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