Stereoscopic image projection processor, projection system and corresponding control method

Abstract

The invention provides a stereo image projection processor (9), comprising: a decomposition light converter (91) for receiving a coherent light source and decomposing the coherent light source into vertically polarized light and horizontally polarized light; the spatial light modulator (92) is connected and communicated with the decomposition light converter (91) and is used for respectively performing phase modulation and amplitude modulation on the vertical polarized light and the horizontal polarized light which are processed by the decomposition light converter (91); and the synthesis light converter (93) is used for synthesizing the vertical polarized light and the horizontal polarized light modulated by the spatial light modulator (92) into one beam of light. A stereoscopic image projection system (8) and a stereoscopic image projection processing method are also provided. By means of the technical scheme, the information to be displayed can be displayed to the user in a three-dimensional mode in real time according to the position of the user without the help of imaging media such as a screen, and real-time interaction with the user can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of stereoscopic image imaging, and in particular to a projection processor for stereoscopic image projection and a corresponding stereoscopic image projection system, and a stereoscopic image projection control method applied to the projection processor and / or the stereoscopic image projection system. Background Art

[0002] Stereoscopic image projection is a new projection method that is currently being tried, but there is no very good technical solution yet, and it has not been widely popularized.

[0003] For example, the Chinese invention patent application with application number "CN202510017312.1" and invention name "A digital holographic restaurant" provides a solution, and the application number "202410943402.9" and invention name "A stereoscopic projection method and a stereoscopic projection auxiliary device for a display terminal" also provides a solution, but its processing solution for stereoscopic projection is not clear.

[0004] In summary, the traditional stereoscopic image projection system has the following limitations:

[0005] 1. Using pre-printed phase amplitude modulation materials, the size of the stereoscopic image to be formed cannot be changed.

[0006] 2. Negative refractive index materials require a physical object for projection.

[0007] 3. The stereoscopic image projection system based on binocular parallax has limited authenticity and viewing angle.

[0008] 4. Traditional spatial light modulators output linearly polarized light. Due to the rotation effect of liquid crystal, the service life, image generation response time, and image maintenance time are all limited by the liquid crystal itself.

[0009] In general, there is still a lot of room for improvement in the field of stereoscopic image projection, and a variety of technical solutions are needed to continuously improve the processing and application of stereoscopic projection. Summary of the Invention

[0010] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a stable and simple-structured stereoscopic image projection processor, a corresponding projection system, and a control method for stereoscopic image projection in the stereoscopic image projection processor and the projection system.

[0011] According to one aspect of the present invention, a stereoscopic image projection processor 9 is provided, which is suitable for a stereoscopic image system for simultaneous real-time viewing by multiple people from multiple angles, and is characterized by at least comprising:

[0012] a decomposition light converter 91 for receiving a coherent light source and decomposing the coherent light source into vertically polarized light and horizontally polarized light;

[0013] a spatial light modulator 92 connected to and in communication with the decomposition light converter 91 and configured to perform phase modulation and amplitude modulation on the vertically polarized light and the horizontally polarized light processed by the decomposition light converter 91 ; and

[0014] The combined light converter 93 is used to combine the vertically polarized light and the horizontally polarized light modulated by the spatial light modulator 92 into one beam of light.

[0015] Preferably, the spatial light modulator 92 performs phase modulation and amplitude modulation on the vertically polarized light and the horizontally polarized light by changing the refractive index of the vertically polarized light and the horizontally polarized light.

[0016] Preferably, the spatial light modulator 92 performs the phase modulation and amplitude modulation through a solid nonlinear crystal 21 .

[0017] Preferably, the phase modulation and amplitude modulation are performed by the electro-optical effect of the solid nonlinear crystal 21 .

[0018] Preferably, the spatial light modulator 92 includes at least a phase adjustment module, which applies different voltages to the electrodes of each pixel point of the solid nonlinear crystal 21 so that the refractive index of different pixel points is different, thereby completing the phase adjustment, and an amplitude adjustment module, which adjusts the refractive index of the solid nonlinear crystal 21 medium to synthesize different light intensities.

[0019] Preferably, the stereoscopic image projection processor 9 further includes an electrical processing device 95 , which is electrically connected to at least the spatial light modulator 92 and is used to apply a voltage to the solid nonlinear crystal 21 to perform at least phase modulation.

[0020] Preferably, the electrical processing device 95 includes a plurality of electrical processing units, each of which corresponds to one pixel or multiple pixels in the solid nonlinear crystal 21, and the phase of each pixel is adjusted separately by controlling the voltage of each electrical processing unit separately.

[0021] Preferably, the electrical processing unit is an electrode.

[0022] Preferably, the solid nonlinear crystal 21 is a polarization beam splitter prism PBS.

[0023] Preferably, the stereoscopic image projection processor 9 further includes a compensation device 94 , which is connected to the spatial light modulator 92 and receives the output of the spatial light modulator 92 , and is used to provide a compensation optical path and perform compensation processing according to the phase required to be adjusted for each pixel.

[0024] Preferably, the spatial light modulator 92 transmits the modulated vertically polarized light and horizontally polarized light to the synthetic light converter 93 in a waveguide manner.

[0025] According to another aspect of the present invention, a stereoscopic image projection system 8 is also provided, which is a stereoscopic image system suitable for multi-angle synchronous real-time viewing by multiple people, and is characterized in that it includes at least the stereoscopic image projection processor 9 according to the above-mentioned method, and also includes a projection device 5. The projection device 5 is connected to the synthetic light converter 93 and is used to receive the light signal synthesized by the synthetic light converter 93 and project the light signal as an input signal.

[0026] Preferably, the projection device 5 is arranged in any one of the following positions:

[0027] -The front end of the projector;

[0028] -The front of the glasses;

[0029] -Embedded in eyeglass frames;

[0030] - the front of the helmet;

[0031] -The front end of the computer;

[0032] - the front of the earphones; or

[0033] -Display device surface.

[0034] Preferably, the stereoscopic image projection system 8 further comprises: a first sensing device 7, which is suitable for sensing the movement of a person's position and at least sends an instruction to the synthetic light converter 93 to project the synthesized light beam to a designated position.

[0035] Preferably, the first sensing device 7 senses human movements and sends instructions to at least the synthetic light converter 93 to project different images according to the human movements.

[0036] According to another aspect of the present invention, a method for processing stereoscopic image projection is provided, which is applicable to a stereoscopic image system for simultaneous real-time viewing by multiple people from multiple angles, and is characterized by comprising at least the following steps:

[0037] Step S101: receiving a coherent light source;

[0038] Step S102: decomposing the coherent light source into vertically polarized light and horizontally polarized light;

[0039] Step S103: performing phase modulation and amplitude modulation on the vertically polarized light and the horizontally polarized light after the above processing respectively;

[0040] Step S104: combining the modulated vertically polarized light and the horizontally polarized light into a beam of light;

[0041] Step S105: Projecting the synthesized light.

[0042] Preferably, at least in step S103 , the phase modulation and amplitude modulation are performed by a solid nonlinear crystal.

[0043] Based on the above technical solution, the present invention achieves phase and amplitude modulation through the electro-optical effect of solid nonlinear crystals. Compared to liquid crystals, the electro-optical effect of solid nonlinear crystals has a faster response time, making it more conducive to the real-time realization of stereoscopic imaging. Furthermore, the present invention uses solid nonlinear crystals to ensure that the stereoscopic projection image viewed from different viewing angles is consistent, thereby significantly improving the market effectiveness of stereoscopic image projection. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0045] Figure 1 It shows a schematic structural diagram of a stereoscopic image projection processor 9 according to a first embodiment of the present invention;

[0046] Figure 2 It shows a schematic structural diagram of a stereoscopic image projection processor 9 according to a second embodiment of the present invention;

[0047] Figure 3 It shows a schematic structural diagram of a stereoscopic image projection processor 9 according to a third embodiment of the present invention;

[0048] Figure 4 It shows a schematic diagram of the working principle of the stereo image projection processor 9 according to the first embodiment of the present invention;

[0049] Figure 5 A schematic diagram showing the working principle of a stereoscopic image projection processor 9 according to a preferred embodiment of the present invention is shown;

[0050] Figure 6 A schematic diagram showing the working principle of a stereoscopic image projection processor 9 according to a preferred embodiment of the present invention is shown;

[0051] Figure 7 It shows a schematic structural diagram of a stereoscopic image projection system 8 according to a first embodiment of the present invention;

[0052] Figure 8 shows a schematic structural diagram of a stereoscopic image projection system 8 according to a second embodiment of the present invention; and

[0053] Figure 9FIG2 shows a flow chart of a processing method for performing stereoscopic image projection in a stereoscopic image projection processor 9 and / or a stereoscopic image projection system 8 according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to better illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0055] Those skilled in the art will appreciate that, to address the technical problem of existing information dissemination solutions being unable to achieve three-dimensional presentations without the limitations of a playback screen or projection area, the present invention provides a solution for disseminating information based on stereoscopic projection, without requiring any projection medium. This technical solution can significantly enhance the user experience and fully utilize public space.

[0056] Specifically, Figures 1 to 3 FIG. 1 shows a schematic diagram of the structure of a stereoscopic image projection processor 9 according to different embodiments of the present invention. Preferably, those skilled in the art will understand that Figure 1 In the first embodiment shown, the stereoscopic image projection processor 9 provided by the present invention includes a decomposition light converter 91, which is used to receive a coherent light source and decompose the coherent light source into vertically polarized light and horizontally polarized light; a spatial light modulator 92, which is connected to and in communication with the decomposition light converter 91 and is used to perform phase modulation and amplitude modulation on the vertically polarized light and horizontally polarized light processed by the decomposition light converter 91, respectively; and a synthesis light converter 93, which is used to synthesize the vertically polarized light and horizontally polarized light modulated by the spatial light modulator 92 into a single beam of light. Through the above embodiment, the spatial light modulator 92 performs phase and amplitude modulation on the coherent light source, thereby enabling stereoscopic image projection. More specifically, those skilled in the art will appreciate that the spatial light modulator 92 performs phase and amplitude modulation on the vertically polarized light and horizontally polarized light by changing their refractive indices. The following embodiments may also preferably be implemented in a similar manner. Furthermore, the spatial light modulator 92 performs the phase and amplitude modulation via a solid nonlinear crystal 21. In a preferred embodiment, the phase modulation and amplitude modulation are performed by the electro-optical effect of the solid nonlinear crystal 21. The following embodiments may also be preferably implemented in a similar manner. Furthermore, in another preferred embodiment, the solid nonlinear crystal 21 is a polarization beam splitter prism PBS.

[0057] and Figure 2In the second embodiment shown, the stereoscopic image projection processor 9 provided by the present invention further includes an electrical processing device 95, which is electrically connected to at least the spatial light modulator 92 and is used to apply a voltage to the solid nonlinear crystal 21. Those skilled in the art will appreciate that after the voltage is applied to the solid nonlinear crystal 21, it can control the refractive index of the vertically polarized light and the horizontally polarized light, thereby achieving phase modulation and amplitude modulation of the vertically polarized light and the horizontally polarized light.

[0058] Preferably, the electrical processing device 95 includes multiple electrical processing units, each of which is electrically connected to each pixel of the solid nonlinear crystal 21 to process each pixel. Preferably, the electrical processing unit can be implemented using electrodes. Below, electrodes are used as a preferred embodiment to describe the specific processing process of the solid nonlinear crystal 21. Those skilled in the art will understand that similar processing methods can be implemented with reference to the principles of Patent No. 202010219774.9, entitled "A Control Method, Device, and System for Thin-Film Transistor Liquid Crystal Displays."

[0059] Furthermore, those skilled in the art understand that in order to achieve a better stereoscopic projection effect, the electrical processing device 95 needs to be configured according to the number of pixels, that is, preferably, one electrical processing unit is configured for each pixel, and the voltage of each electrical processing unit of the electrical processing device 95 is precisely controlled by an algorithm. Each pixel is provided with a set of electrodes, and the output of the electrical processing unit is connected to the input of the pixel electrode. Thus, by changing the voltage of the electrical processing unit, the refractive index of the pixel is adjusted, that is, the solid nonlinear crystal 21 is adjusted, thereby modulating the phase of each pixel, that is, completing the modulation of the refractive index of light, thereby achieving a stereoscopic projection effect in the final projection effect. Furthermore, those skilled in the art understand that the stereoscopic projection effect can be changed according to the refractive index of the solid nonlinear crystal 21, thereby achieving different effects, and these variations are within the scope of protection of the present invention. In a variation, two or more pixels can be controlled by a single electrode to achieve modulation changes, etc., and these are also within the scope of protection of the present invention.

[0060] Specifically, in the stereoscopic projection device of the embodiment provided by the present invention, the light emitted by a real object, when transmitted to the human eye, contains both the amplitude and phase information of the light. By restoring the amplitude and phase information of the light, a holographic image identical to the real object can be created. In this embodiment, the spatial light modulator 92 effectively completes the reconstruction of the amplitude and phase of the light.

[0061] A spatial light modulator 92 is a device that modulates the amplitude or phase of light waves. In stereoscopic projection, it accurately rewrites the interference pattern onto a transparent medium. By altering the amplitude or phase of light, the spatial light modulator 92 creates complete interference information, similar to how the human eye perceives real objects.

[0062] In a specific embodiment, the light reconstruction process can be explained as follows:

[0063] In a stereoscopic projection system, the spatial light modulator 92 is responsible for precisely adjusting the amplitude and phase information of the light signals from the object and reference light source. This adjustment enables the hologram formed on the transparent medium to accurately reproduce the information of the original object. Therefore, the spatial light modulator 92 plays a key role in stereoscopic projection, ensuring that complete light information is transmitted and reconstructed, thereby achieving high-quality image display.

[0064] In a specific embodiment, the stereoscopic projection device provided by the present invention utilizes the electro-optical effect to adjust the amplitude and phase information of light. Specifically:

[0065] 1. In the phase adjustment module, different voltages are applied to the electrodes of each pixel point, so that the refractive index of different pixel points is different. Since the thickness of the phase adjustment nonlinear medium used is the same, the coherent light produces different phase differences after passing through the nonlinear medium, thereby completing the phase adjustment. In a preferred embodiment, the electrical processing device 95 can be understood as the above-mentioned phase adjustment module, and the electrical processing device 95 is used to apply different voltages to each pixel point of the solid nonlinear crystal (21).

[0066] 2. In the amplitude modulation module, the attenuation of light at the optical interface of the amplitude modulation nonlinear medium and the multi-beam interference effect can be used to adjust the refractive index of the nonlinear medium to produce different interference effects, thereby synthesizing different light intensities. However, this synthesis process may produce additional phase differences, which need to be compensated in the phase modulation module or the compensation device.

[0067] Furthermore, in Figure 3 In the third embodiment shown, the stereoscopic image projection processor 9 includes a compensation device 94, which is connected to the spatial light modulator 92 and receives the output of the spatial light modulator 92, and is used to provide a compensation optical path and perform compensation processing according to the phase required to be adjusted for each pixel.

[0068] Furthermore, because the coherent light is decomposed into horizontally polarized light and vertically polarized light after passing through the optical decomposer (i.e., the decomposition optical converter 91), two different optical paths will be generated respectively. We can make the optical paths of the two optical paths the same by geometric optical path compensation, and complete the compensation by adjusting the optical paths.

[0069] Furthermore, combined Figures 1 to 7 In the embodiment shown, those skilled in the art will understand that the spatial light modulator 92 transmits the modulated vertically polarized light and horizontally polarized light to the synthesized light converter 93 via a waveguide. Preferably, the spatial light modulator 92 and the synthesized light converter 93 can be connected via an optical fiber. In another embodiment, the spatial light modulator 92 and the synthesized light converter 93 can both be implemented as chips and connected via a common circuit board. Furthermore, those skilled in the art will understand that the above-mentioned transmission via a waveguide can be performed in a relatively preferred manner to transmit signals, thereby maximizing speed and avoiding light source distortion. Furthermore, the decomposition light converter 91 and the spatial light modulator 92 can also be connected and transmit signals via a waveguide.

[0070] Combine Figures 4 to 6 The embodiment shown is a schematic diagram of the working principle of the stereoscopic image projection processor 9. Those skilled in the art understand that after the projector light source emits light, the light is decomposed into horizontally polarized light and vertically polarized light through an optical converter, and then the spatial light modulator is used to modulate the phase and amplitude of the horizontally polarized light and the vertically polarized light respectively, and then the modulated horizontally polarized light and the vertically polarized light are re-synthesized using the optical converter, and finally output as a stereoscopic image.

[0071] More specifically, those skilled in the art will appreciate that, in different embodiments, the solid nonlinear crystal can be configured in different ways depending on implementation requirements. For example, the solid nonlinear crystal can be configured in different ways depending on implementation requirements, such as using transparent electrodes to apply an electric field to the nonlinear medium in an optical path, or using general electrodes to apply an electric field to the nonlinear medium in a non-optical path.

[0072] More preferably, those skilled in the art will appreciate that, in a preferred embodiment, the control of the pixels by the electrical processing unit can be controlled in the following manner. For different nonlinear media, the change in their refractive index with the applied electric field can be approximately linear, and their ratio can be defined as: There are Where d is the distance between the positive and negative electrodes, and ΔU is the voltage applied to the electrodes. By changing the voltage ΔU applied to the electrodes, the refractive index of the nonlinear crystal can be changed to n+Δn, thereby generating a relative phase difference. Where a is the thickness of the nonlinear crystal, which realizes phase modulation of the light field. The above method can realize voltage adjustment according to specific needs, thereby realizing phase modulation and amplitude modulation of the vertically polarized light and the horizontally polarized light respectively through the solid nonlinear crystal 21.

[0073] Furthermore, in a preferred embodiment, we require The adjustable range of is at least [-π, π], that is, It can also be understood as This allows for parameter settings in the above modulation process, and ultimately achieves ideal phase modulation and / or amplitude modulation effects.

[0074] Combined with the above description, and refer to Figures 1 to 6 In the embodiment shown, those skilled in the art will understand that the stereo image processor 9 provided by the present invention can be Figure 3 The compensation device 4 shown compensates for the modulation results of the horizontally polarized light and the vertically polarized light, thereby achieving stable phase modulation and amplitude modulation of the horizontally polarized light and the vertically polarized light, achieving stable and real-time output of stereoscopic image projection, and providing the audience with a relatively good viewing experience. Furthermore, the basic idea behind the compensation performed by the compensation device 4 is to ensure that the phase adjustment effect meets the following conditions: Δn*d>λ, where λ is the wavelength of the coherent light, that is, the adjustment range can be increased by increasing d. In another embodiment, the refractive index adjustment range of the amplitude adjustment module is required to be as large as possible. If a single amplitude adjustment module cannot meet the requirements, a wider range of adjustment can be achieved by connecting multiple modules in series.

[0075] Combine Figure 7 、 Figure 8 The embodiment shown is a schematic structural diagram of a stereoscopic image projection system 8. Specifically, in a first preferred embodiment, the stereoscopic image projection system includes a stereoscopic image projection processor 9 and a projection device 5. The projection device 5 is connected to the synthetic light converter 93 and is used to receive the optical signal synthesized by the synthetic light converter 93 and project the optical signal as an input signal. Figure 8 In the illustrated embodiment, the stereoscopic image projection system 8 includes a receiver 6 , a stereoscopic image projection processor 9 , a projection processor 7 and a projection device 5 .

[0076] Specifically, the receiver 6 is suitable for receiving stereoscopic image information and initial projection position information. Specifically, the receiver 6 is suitable for receiving stereoscopic image information and initial projection imaging position information. For example, in one embodiment, a method of sampling the light information of an object can be achieved in the following manner. Specifically, the stereoscopic image utilizes the principle of double-beam interference, so that the object light and another light beam (reference beam) coherent with the object light produce an interference pattern to "merge" the phase, thereby simultaneously recording the phase and amplitude with a photosensitive film to obtain a stereoscopic image. The stereoscopic image information includes information to be published consisting of multiple static images and / or dynamic videos. More specifically, the information is at least image information in a three-dimensional format; the initial projection position information is preset, published projection position information or published by an external device. The receiver 6 is connected to an external server via a wired or wireless method to receive stereoscopic image information and initial projection position information from the external server.

[0077] The projection processor 7 is adapted to obtain projection position information of the projection based on the initial projection position information. Specifically, the obtained projection position information is determined by adjusting the initial projection position information by using the projection angle of adjacent projection devices. The projection angle is preset or provided by an external device.

[0078] Preferably, the projection device 5 is adapted to transmit the stored stereoscopic image information based on the obtained projection position information. In a preferred embodiment, the projection device 5 is preferably composed of n signal transmitting devices; and the signal transmitting angle formed by each of the signal transmitting devices and the ground is within the range of [0°, θ°]. Specifically, the signal transmitting devices of the projection device 5 are arranged at least in a ring and / or a strip. More specifically, the principle of the signal transmitting device is similar to that of a micro projector, etc. Preferably, the information release position is a fixed position determined based on the projection device 5, for example, the center point of the room or other position at the optimal imaging angle of the projection device 5. Preferably, the signal transmitting angle θ=45, that is, the signal transmitting angle formed by each of the signal transmitting devices and the ground is within the range of [0°, 45°]. In a preferred example, the signal transmitter consists of three signal transmitting devices arranged in a ring shape in an exhibition space, and the signal transmitting angle formed by each of the signal transmitting devices and the ground is 45°. When the user approaches the exhibition space and is sensed by the infrared sensor device arranged in the exhibition space and triggers the control instruction to release the stereoscopic image information, the stereoscopic image information is sent to the three signal transmitting devices, and the signal transmitting devices respectively project the stereoscopic image information toward the center of the ring at an angle of 45° to the ground, thereby forming a stereoscopic image.

[0079] Furthermore, the multiple signal sending devices in the projection device 5 can also simultaneously project based on signal transmission angles different from the ground to present different partial images of the stereoscopic image information.

[0080] Refer to the above Figures 1 to 7 In the illustrated embodiment, those skilled in the art will appreciate that, preferably, the projection device 5 is disposed at the front end of the projector, for example, on the front panel of the projector, or at the upper front end of the projector. For other devices with display functions or display requirements, such as glasses, the projection device 5 can be fixed forward of the junction between the temple and the frame, or positioned at a position corresponding to the bridge of the nose. In another embodiment, a groove can be provided in the frame to accommodate the projection device 5. In yet another embodiment, the projector is replaced with a helmet. The projection device 5 can be positioned anywhere on the front end of the helmet, such as a traditional underground work helmet or a current sports helmet with a camera, all of which fall within the scope of protection of the present invention. In yet another embodiment, the projection device 5 can be positioned at the front end of a side of a headset, allowing the headset to be used for both voice calls and stereoscopic image display. Correspondingly, those skilled in the art will appreciate that the stereoscopic image projection processor provided by the present invention, which is compatible with the projection device 5, can be adaptively installed in devices such as the aforementioned projectors, helmets, glasses, headphones, headgear, and automotive head-up displays. The corresponding hardware can be designed to fit the dimensions of these devices, or these devices can be adaptively modified. All of these are within the scope of protection of the present invention.

[0081] Furthermore, in a first variation of the present embodiment, the stereoscopic image projection system 8 provided by the present invention further includes a first sensing device, which is suitable for sensing the movement of a person's position, and which at least sends an instruction to the synthetic light converter 93 to project the synthesized light beam to a specified position. More specifically, those skilled in the art understand that when the first sensing device is triggered, the initial projection position information is changed. Specifically, the first sensor corresponds to at least one predetermined position information, and the initial projection position information is changed based on the predetermined position information corresponding to the triggered first sensor. The predetermined position information is the angle or coordinate of the first sensor on the horizontal plane. More specifically, in order to better understand the role of the first sensing device, the following example illustrates that when the user's viewing position changes while viewing the stereoscopic image information, the background server determines a new information release position S based on the change in the positioning information of the user's corresponding user terminal, and determines the projection direction or projection content of the stereoscopic image projection system 8 based on the new information release position S.

[0082] Those skilled in the art understand that, compared with the present embodiment, the technical solution described in the first variation of the present embodiment is preferably applicable to situations where the information release position needs to change during the process of releasing the stereoscopic image information. The change in the information release position can be generated based on the pre-setting of the background server, or can be obtained based on the change of the viewer's position. The technical solution described in the present embodiment adjusts the information release position in time according to the change of the viewer's position, ensuring that the projected image is always within the viewer's line of sight, thereby optimizing the user experience.

[0083] Furthermore, in another variation, the first sensing device senses human movement and sends instructions to at least the synthetic light converter 93 to project different images according to the human movement.

[0084] Furthermore, refer to Figure 9 The embodiment shown is a flow chart of a processing method for performing stereoscopic image projection in a stereoscopic image projection processor 9 and / or a stereoscopic image projection system 8. Specifically, the processing method includes the following steps:

[0085] Step S101: receiving a coherent light source;

[0086] Step S102: decomposing the coherent light source into vertically polarized light and horizontally polarized light;

[0087] Step S103: performing phase modulation and amplitude modulation on the vertically polarized light and the horizontally polarized light after the above processing respectively;

[0088] Step S104: combining the modulated vertically polarized light and the horizontally polarized light into a beam of light;

[0089] Step S105: Projecting the synthesized light.

[0090] Preferably, those skilled in the art understand that at least in step S103 , the phase modulation and amplitude modulation are performed by a solid nonlinear crystal.

[0091] Specifically, those skilled in the art can refer to Figures 1 to 8 The illustrated embodiment implements the phase modulation and amplitude modulation of the solid nonlinear crystal, as well as the implementation of the other steps mentioned above, which are all included in the protection scope of the present invention.

[0092] Furthermore, those skilled in the art will understand that referring to the above Figures 1 to 9In the embodiment shown, in solid nonlinear crystals, the primary effect of the electric field is much more significant than the secondary electro-optic effect (the secondary effect of the electric field), so we can only consider the linear electro-optic effect, where the change caused by the primary term of the electric field is called the linear electro-optic effect, and the change caused by the secondary term of the electric field is called the secondary electro-optic effect. We use the refractive index ellipsoid to describe the relationship between the refractive index and the propagation direction and vibration direction of light. In the principal axis coordinate system, the refractive index ellipsoid equation is:

[0093]

[0094] In the above formula, n i The refractive index along the three principal axes of the ellipsoid is called the principal refractive index. For example, in the XOY plane, where X is the horizontal direction, the magnitudes of the major and minor axes represent the refractive indices n1 and n2 of linearly polarized light vibrating along these two directions, and their propagation velocities are c0 / n1 and c0 / n2, respectively.

[0095] right Figures 1 to 9 When an electric field is applied to the solid nonlinear crystal, the shape, size, and orientation of the refractive index ellipsoid in the above formula change, and the ellipsoid equation becomes:

[0096]

[0097] The cross term in the above formula is caused by the electric field, indicating that the main axis of the deformed ellipsoid does not coincide with the original main axis. The relationship between the refractive index and the electric field can be expressed as:

[0098]

[0099] For example, we choose the incident light as linearly polarized light, and select n1=n2=n0, n3=n e Symmetric crystal to avoid the influence of cross terms, we can get the following formula:

[0100]

[0101] The electric field is applied in the Z-axis direction (long axis direction), so the equivalent refractive index of horizontally polarized light is The equivalent refractive index of vertically polarized light is Therefore, the relative phase can be adjusted by adjusting the voltage to change the refractive index of the medium.

[0102] Furthermore, we take another material of the same type to change the amplitude. Again, we take horizontally polarized light as an example. The light in this material can be represented as multi-beam interference, I r is the reflected light intensity, I t is the transmitted light intensity. The formula is as follows:

[0103] in

[0104] but

[0105] I tmax =1

[0106] In the above formula, R is determined by the Fresnel formula, Where n1 is the refractive index of the transparent electrode (in actual implementation, additional dielectrics can be added between the KDP and the transparent electrode to increase the maximum value of R). Also, θ is typically chosen to be 90°. Therefore, R, and thus the amplitude, can be varied by changing n2.

[0107] Further, refer to the above Figures 1 to 9 In the illustrated embodiment, coherent light from a light source is split into two beams, one vertically polarized and one horizontally polarized, through a PBS crystal. This facilitates phase and amplitude adjustment of the two beams. Because the two beams follow different optical paths, the specific phase and amplitude adjustments may differ, but ensuring the same overall phase and amplitude adjustments during the final synthesis is sufficient.

[0108] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A stereoscopic image projection processor (9), suitable for a stereoscopic image system for multiple people to watch synchronously from multiple angles in real time, characterized in that: At least: A decomposition light converter (91) is used to receive a coherent light source and decompose the coherent light source into vertically polarized light and horizontally polarized light; a spatial light modulator (92) connected to and in communication with the decomposition light converter (91) and configured to perform phase modulation and amplitude modulation on the vertically polarized light and the horizontally polarized light processed by the decomposition light converter (91); and The synthesized light converter (93) is used to synthesize the vertically polarized light and the horizontally polarized light modulated by the spatial light modulator (92) into a beam of light.

2. The stereo image processor (9) according to claim 1, characterized in that The spatial light modulator (92) performs phase modulation and amplitude modulation on vertically polarized light and horizontally polarized light by changing their refractive indices.

3. The stereoscopic image projection processor (9) according to claim 1 or 2, characterized in that: The spatial light modulator (92) performs the phase modulation and amplitude modulation through a solid nonlinear crystal (21).

4. The stereoscopic image projection processor (9) according to claim 3, characterized in that The invention also comprises an electric processing device (95) which is electrically connected to at least the spatial light modulator (92) and is used for applying a voltage to the solid nonlinear crystal (21) to perform at least phase modulation.

5. The stereoscopic image projection processor (9) according to claim 3 or 4, wherein the solid nonlinear crystal (21) is a polarization beam splitter (PBS).

6. The stereoscopic image projection processor (9) according to any one of claims 1 to 5, further comprising a compensation device (94), which is connected to the spatial light modulator (92) and receives the output of the spatial light modulator (92), and is used to provide a compensation optical path and perform compensation processing according to the phase required to be adjusted for each pixel.

7. The stereoscopic image projection processor (9) according to any one of claims 1 to 6, wherein the spatial light modulator (92) transmits the modulated vertically polarized light and horizontally polarized light to the synthetic light converter (93) in a waveguide manner.

8. A stereoscopic image projection system (8), suitable for multiple people to watch in real time from multiple angles simultaneously, characterized in that: The invention comprises at least a stereoscopic image projection processor (9) according to any one of claims 1 to 7, and further comprises a projection device (5), wherein the projection device (5) is connected to the synthetic light converter (93) and is used to receive the optical signal synthesized by the synthetic light converter (93) and project the optical signal as an input signal.

9. The stereoscopic image projection system (8) according to claim 8, characterized in that The projection device (5) is arranged in any one of the following positions: -The front end of the projector; -The front of the glasses; -Embedded in eyeglass frames; - the front of the helmet; -The front end of the computer; -The front end of the earphones; -The top of the hood; - the front end of a heads-up display; or -Display device surface.

10. The stereoscopic image projection system (8) according to any one of claims 1 to 9, characterized in that Also includes: A first sensing device is adapted to sense the movement of a person's position and at least sends an instruction to the synthetic light converter (93) to project the synthesized light beam to a designated position.

11. The stereoscopic image projection system (8) according to claim 10, characterized in that The first sensing device senses the movement of a person and sends instructions to at least the synthetic light converter (93) to project different images according to the movement of the person.

12. A stereoscopic image projection processing method, applicable to a stereoscopic image system for multiple people to simultaneously view from multiple angles in real time, characterized in that: At least the following steps are included: Step S101: receiving a coherent light source; Step S102: decomposing the coherent light source into vertically polarized light and horizontally polarized light; Step S103: performing phase modulation and amplitude modulation on the vertically polarized light and the horizontally polarized light after the above processing respectively; Step S104: combining the modulated vertically polarized light and the horizontally polarized light into a beam of light; Step S105: Projecting the synthesized light.

13. The processing method according to claim 12, characterized in that: At least in step S103 , the phase modulation and amplitude modulation are performed by a solid nonlinear crystal.

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