CN106526876A - Assistance-free stereo display device adopting spatial light modulator - Google Patents

Abstract

An unassisted three-dimensional display device using a spatial light modulator, comprising a spatial light modulator composed of a viewer's spatial position detection module, a position adjustment mechanism, an intelligent backlight, and a liquid crystal display; the position adjustment mechanism is placed on the intelligent backlight for spatial light modulation between the monitors; the length c of the display unit of the liquid crystal display, the distance between the slit grating and the liquid crystal display d, and the interpupillary distance u of the viewer; after the spatial position detection module of the viewer detects that the distance between the viewer and the smart backlight changes, the position The control engine of the adjustment mechanism issues instructions to control the position adjustment structure to adjust the distance between the spatial light modulator and the intelligent backlight, so as to realize the formation of left and right viewing windows at different distances, that is, the convergence of the left and right viewing windows at a specific distance; the control engine of the intelligent backlight controls the intelligent The backlight emits a different light, and the smart backlight produces diffuse or slit light.

Description

An unassisted stereoscopic display device using a spatial light modulator

1. Technical field

The invention relates to the technical field of information display, and relates to an auxiliary stereoscopic display device using a spatial light modulator.

2. Background technology

3D perception occupies an extremely important position in human information acquisition, and has attracted considerable attention from science, engineering and business circles, and various 3D display methods have been studied. Most 3D displays fall into at least one of three categories: stereoscopic, volumetric, or holographic displays. In binocular stereoscopic displays, discrete 2D images are presented separately to the left and right eyes of the viewer; in spatial volumetric displays, images are displayed in a 3D space; and in holography, images are reconstructed from wavefronts and Provides the viewer with a completely comfortable and realistic experience. Binocular stereo can be divided into auxiliary stereo and free stereo. Assisted stereo needs to wear corresponding auxiliary equipment, which limits its application, while free stereo does not need to wear other equipment, and the viewing method is flexible. Therefore, it may have developed greatly.

Assisted stereo technology is relatively mature, and its main feature is wearing glasses, helmets and other equipment. The main principle is to ensure that the left and right images enter the left and right eyes of the viewer respectively, and a stereoscopic image is synthesized in the visual center of the human brain. Specific implementation methods include polarized glasses, active shutter glasses, complementary color glasses, and the like.

Glasses-free 3D technology can be divided into light barrier type, lenticular lens type, multi-layer display technology, and directional backlight 3D technology.

The light barrier 3D display technology is a new display technology jointly developed by several engineers from the European R&D Department of Sharp Corporation. When the LCD panel is displayed in front of the audience, the polarization mode can distinguish the images received by the left and right eyes, thereby forming a three-dimensional display image in the audience's brain. This technology integrates the polarization mode and polymer layer inside the display, which controls the cost to a certain extent. However, it is difficult to increase the brightness in the aspect of image display, and at the same time, it is difficult to achieve high-definition display effect. Therefore, it is not a mature naked-eye 3D display technology. In the implementation process, the light barrier is placed obliquely to balance the loss of stereoscopic image resolution in the horizontal and vertical directions, and at the same time reduce the influence of moiré fringes. However, crosstalk between adjacent viewpoint images is caused. The existence of crosstalk reduces the quality of stereoscopic images and easily causes visual fatigue of viewers.

The lenticular lens type, as the name implies, is to use a lenticular lens. Install a row of cylindrical lenses in front of the liquid crystal display screen, so that the image will appear on the focal plane of the lens. In this way, each pixel in the image is presented in the two eyes of the person through the lens. Once the light of the pixel enters the left and right eyes through different angles, the person will superimpose the images received by the two eyes in the brain to form a 3D image. Compared with other display technologies, the main advantage of lenticular 3D display technology is that it can meet the brightness requirements of the image, but the image is presented to the audience through a layer of lens after all, so it is difficult to have a higher image resolution. Big breakthrough. Moreover, adding a lens in front of the LCD screen requires greater manufacturing costs, and the later maintenance costs are also very high, which is not conducive to popularization and use.

The multi-layer display technology (MLD-Multi Layer Display) researched and developed by PureDepth in the United States is a naked-eye 3D display technology. The advantage of this technology is that it will not cause adverse reactions to the audience, such as nausea and dizziness. At the same time, this technology also breaks through the limitations of the field of view and angle, so that the viewing place can be further expanded, but there is a problem that the parallax is not suitable for control.

The directional light source 3D technology is basically similar to the above-mentioned display technology in terms of display principle, the difference is that this technology requires two background light sources when presenting a 3D image. When the left and right eyes of the audience receive the picture at the same time, the background light sources in different directions light up alternately in turn, and the left and right eye pictures are alternately presented in front of the audience through the 3M reflective film. Since the human eye has a certain visual pause time, alternately appearing pictures can form a 3D picture in the human brain. This technology needs to assist human eye tracking, and at the same time, in order to obtain a good three-dimensional effect, the size of the light source needs to be strictly controlled, so the brightness of the display is generally not high. For details, please refer to the Chinese patent: flat unaided three-dimensional display device and method-103605211A.

However, the present invention provides an unassisted stereoscopic display device using a spatial light modulator, which overcomes the disadvantages of traditional stereoscopic displays. The outstanding features of the present invention are that it can be viewed at multiple distances, has low crosstalk rate, is compatible with plane and stereo, is portable, and can be used for displays of various sizes.

3. Contents of the invention

The purpose of the present invention is to propose an unassisted stereoscopic display device using a spatial light modulator and a stereoscopic display method, and the unassisted stereoscopic display device using a spatial light modulator overcomes the shortcomings of traditional stereoscopic displays. It automatically allows viewers to watch at multiple distances (positions), has low crosstalk rate of images, is compatible with three-dimensional planes, is portable, and can be used for stereoscopic display monitors of various sizes.

The present invention is realized through the following technical scheme, the unassisted stereoscopic display device adopting the spatial light modulator, that is, the unassisted (device) stereoscopic display device that can be viewed at multiple distances, including the viewer's spatial position detection module, position adjustment mechanism, intelligent The backlight 2 and the spatial light modulator 3 composed of a liquid crystal display; the position adjustment mechanism is placed between the intelligent backlight and the spatial light modulator; the liquid crystal display has a display unit length c, and a distance d between the slit grating and the liquid crystal display. The interpupillary distance u;

After the viewer's spatial position detection module detects that the distance between the viewer and the intelligent backlight 2 changes, the control engine of the position adjustment mechanism issues an instruction to control the position adjustment structure to adjust the distance between the spatial light modulator and the intelligent backlight to achieve different distances. The left and right viewing windows are formed, that is, the left and right viewing windows are converged at a specific distance; the distance between the spatial light modulator and the intelligent backlight has a corresponding mathematical relationship with the distance between the left and right viewing windows, L1, L2 and L3 represent different viewing distances, d1, d2 and d2 represent the distance between the spatial light modulator and the intelligent backlight (luminous plane); the corresponding relationship between the two is:

Different viewing distances for L1, L2 and L3 respectively.

Furthermore, the control engine of the smart backlight controls the smart backlight to emit different lights. When the display of flat content is detected, the smart backlight generates diffuse light, and when the display of three-dimensional content is detected, the smart backlight generates slit light.

Furthermore, the spatial light modulator and the intelligent backlight are connected through high-precision electric screw rods (especially three high-precision electric screw rods), and can be kept relatively parallel in the process of stationary and relative movement. The control engine of the spatial light modulator controls the movement of the high-precision electric screw to adjust the distance between the spatial light modulator and the intelligent backlight.

Further, the spatial light modulator uses an ultra-high-definition liquid crystal display. According to the optical principle, there is a certain loss of resolution in the stereo mode, and the display resolution in the plane mode is equal to the physical resolution. In the flat display mode, the playback content is an ordinary flat screen, so the display resolution can be equal to the physical resolution of the display screen to achieve ultra-high-definition display. When playing a stereoscopic image, the left and right views are merged and displayed through the slit, and converged at different positions. Therefore, the resolution of the left and right images is half of the physical resolution of the display screen, and the resolution is reduced.

Further, the viewer's spatial position detection module is used to detect the distance between the viewer and the device in real time, and realize high-precision pupil tracking; the spatial light modulator control engine adjusts the device through position information and distance information to adjust the spatial light modulator Mode switching is performed to realize the convergence of the left and right viewing windows in the left and right pupils of the viewer, and project the left and right views to the left and right pupils respectively; realize the movement of the left and right observation windows with the left and right pupils, ensuring that the left and right views enter the viewer's left and right pupils respectively.

Furthermore, the spatial light modulator and the intelligent backlight are connected by a high-precision screw, which can maintain relative parallelism in the process of stationary and relative movement.

Using the unassisted stereoscopic display method of the spatial light modulator, the viewer's spatial position detection module detects the distance between the viewer and the device in real time, and realizes high-precision pupil tracking, adjusts the spatial light modulator to switch modes, and realizes left and right viewing windows Convergence is achieved at the left and right pupils of the viewer, and the left and right views are respectively projected to the left and right pupils; the control engine adjusts the device through position information and distance information to realize the movement of the left and right observation windows with the left and right pupils, ensuring that the left and right views enter the viewer's left and right pupils respectively; After the distance between the viewer and the device changes, the control engine of the spatial light modulator issues a command to control the position adjustment mechanism to change the distance between the spatial light modulator and the intelligent backlight, so that the left and right viewing windows can converge at different distances; space The control engine of the light modulator can control the intelligent backlight to provide different light sources according to different display contents, emit slit light in stereoscopic mode, and emit diffuse light in planar mode;

The smart backlight 2 control engine can control the smart backlight to provide different light sources according to the different display contents. It emits slit light in stereoscopic mode and diffuse light in planar mode. The viewer spatial position detection module can detect the distance between the viewer and the device in real time, and realize high-precision pupil tracking. The control engine adjusts the device through position information and distance information to realize the movement of the left and right observation windows with the left and right pupils, ensuring that the left and right views enter the viewer's left and right pupils respectively.

The spatial light modulator, that is, the liquid crystal display, uses a grating to realize the light splitting principle, and the principle of the front and rear gratings is the same. The length c of the display unit, the distance between the slit grating and the LCD screen d, the interpupillary distance u, and the viewing distance L; through the way of light modulation, the arbitrary exchange of the left and right viewing windows is realized. When the viewer watches in different positions, the control engine switches the mode by adjusting the spatial light modulator, so that the left and right viewing windows can be converged on the left and right pupils of the viewer, and the left and right views are projected to the left and right pupils respectively;

The distance between the spatial light modulator and the intelligent backlight has a corresponding mathematical relationship with the distance between the left and right viewing windows. L1, L2, and L3 represent different viewing distances, and d1, d2, and d2 represent the distance between the spatial light modulator and the intelligent backlight. distance; the corresponding relationship between the two is:

According to the optical principle, the change of the distance between the spatial light modulator and the intelligent backlight will cause the left and right viewing windows to move back and forth; after the viewer spatial position detection module detects that the distance between the viewer and the device changes, the control engine controls the position The adjustment mechanism adjusts the distance between the spatial light modulator and the intelligent backlight, so that the left and right viewing windows can converge at a specific distance.

Further, multi-distance viewing is realized by using a position adjustment mechanism. The spatial light modulator and the intelligent backlight are parallel to each other and keep parallel to each other during the movement.

Further, adopt intelligent backlight. The control engine can control the smart backlight to emit different lights; when it detects displaying flat content, the smart backlight generates diffuse light; when it detects displaying three-dimensional content, the smart backlight generates slit light.

The viewer spatial position detection module obtains free viewing distance and pupil position information. According to the free viewing distance, the control engine adjusts the structure to change the distance between the intelligent backlight and the spatial light modulator, so as to realize the convergence of viewing windows at different free viewing distances. According to the pupil position information of the viewer, the spatial light modulator is adjusted so that the corresponding left and right viewing windows converge on the left and right pupils of the viewer, and move in real time following the pupils.

This solution uses an intelligent backlight to backlight the display. In the flat playback mode, the intelligent backlight emits diffuse light, which has the characteristics of large viewing angle and uniform brightness. In the stereo playback mode, the emitted high-brightness slit light source forms left and right viewing windows at specific positions through the spatial light modulator. The lighting state of the smart backlight is determined by the playback content detected by the control engine, achieving flat and three-dimensional compatibility.

This solution uses a spatial light modulator to realize that the left and right viewing windows follow the left and right pupils of the viewer. After the slit light irradiates the spatial light modulator, left and right viewing windows will be formed at specific positions. Viewers in the range of this viewing window can see two images with parallax, and synthesize a three-dimensional scene in the visual center of the brain. After the position of the viewer changes, the spatial position detection module of the viewer tracks the change of the pupil position in time, and transmits the position information to the control engine. The spatial light modulator changes the light modulation mode according to the corresponding instruction of the control engine, and converges the left and right viewing windows to the moved left and right pupil positions. This process responds dynamically and has high real-time performance, which completely avoids the jitter problem during the switching process. The control engine adjusts the device through position information and distance information to realize the movement of the left and right observation windows with the left and right pupils, ensuring that the left and right views enter the viewer's left and right pupils respectively. When the viewer watches in different positions, the control engine of the spatial light modulator switches the mode by adjusting the spatial light modulator, so that the left and right viewing windows converge on the left and right pupils of the viewer, and the left and right views are respectively projected to the left and right pupils. The spatial light modulator control engine can control the intelligent backlight to provide different light sources according to different display contents, emit slit light in stereoscopic mode, and emit diffuse light in planar mode. In this way, flat and three-dimensional compatibility is achieved, and the device is compact and practical.

The solution adopts a position adjustment mechanism to realize multi-distance viewing. The spatial light modulator and the intelligent backlight are parallel to each other and keep parallel to each other during the movement. According to the characteristics of the optical system, when the distance between the spatial light modulator and the smart backlight is different, the light can be converged at different distances to form left and right viewing windows. The position adjustment mechanism realizes watching stereoscopic images at different distances by adjusting the distance between the two.

This solution uses the viewer spatial position detection module to capture the position changes of the viewer in real time, including the distance between the viewer and the device and the spatial position parallel to the device. When the viewer is at a specific distance in front of the device, the position adjustment mechanism changes the distance between the spatial light modulator and the intelligent backlight, so as to realize the formation of left and right viewing windows at the specific free viewing distance. At the same time, the spatial position change of the viewer parallel to the device is captured, and the spatial light modulator realizes light modulation according to the position change, so as to form left and right viewing windows on the left and right pupils of the viewer.

The beneficial effects of the present invention are: compared with prior art, its remarkable advantage is:

1. Using a spatial light modulator. Left and right viewing windows can be formed anywhere in the viewing area;

2. Adopt intelligent backlight. Intelligently control the light output mode to achieve flat and three-dimensional compatibility.

3. Adopt the spatial position detection module of the measured person. This module can realize the detection of the three-dimensional position of the viewer in space. The distance between the spatial light modulator and the intelligent backlight is controlled according to the free viewing distance, and the spatial light modulator is controlled according to the position of the left and right pupils of the viewer to form left and right viewing windows at a specific position; the purpose of freely viewing stereoscopic images is realized.

4. Flat and stereo compatible. Not only can it be used as a stereoscopic display, but the prepared stereoscopic display can also be used as a common flat display.

5. The overall structure is compact and thin;

In conclusion, the present invention provides an unassisted stereoscopic display device using a spatial light modulator, which overcomes the disadvantages of traditional stereoscopic displays. It can be viewed at multiple distances, giving viewers a good experience, without any auxiliary glasses and other devices, low image crosstalk rate, flat and stereo compatible, portable, and can be used for displays of various sizes.

4. Description of drawings

The overall structure side view of Fig. 1, an implementation example;

Figure 2. Schematic diagram of the spatial light modulator engine for multi-distance viewing;

Figure 3. Schematic diagram of two-viewpoint front grating;

Figure 4. Schematic diagram of the staggered arrangement of exit pupils at two viewpoints;

Figure 5. Schematic diagram of smart backlight.

5. Specific implementation

In FIG. 1 , a position adjustment mechanism 1, an intelligent backlight 2, a spatial light modulator 3, a viewing position A, and a viewing position B. In Fig. 2, the best viewing distance V(A) and the best viewing distance V(B). In Figure 3, the display unit length c, the distance between the slit grating and the LCD screen d, the interpupillary distance u, and the viewing distance L, L1, L2, and L3 represent different viewing distances, and d1, d2, and d2 represent the spatial light modulator and intelligent Distance between backlights.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The basic idea of the present invention is that when the distance between the viewer and the device changes, the control engine issues instructions to control the position adjustment mechanism to change the distance between the spatial light modulator and the intelligent backlight. The distance between the left and right viewing windows can be realized at different distances. The viewer spatial position detection module can detect the distance between the viewer and the device in real time, and realize high-precision pupil tracking. The control engine adjusts the device through position information and distance information to realize the movement of the left and right observation windows with the left and right pupils, ensuring that the left and right views enter the viewer's left and right pupils respectively. The control engine can control the intelligent backlight to provide different light sources according to the different display contents. It emits slit light in stereoscopic mode and diffuse light in planar mode. It is necessary to point out here that the following examples are only used to further illustrate the present invention, and cannot be interpreted as limiting the protection scope of the present invention. Those skilled in the art make some non-essential improvements and improvements to the present invention according to the above-mentioned content of the invention. Adjustment still belongs to the protection scope of the present invention.

In this implementation example, the device is composed of a spatial light modulator, a viewer spatial position detection module, a control engine, an intelligent backlight and a position adjustment mechanism. In this implementation example, the spatial light modulator uses an ultra-high-definition liquid crystal display. According to the optical principle, there is a certain loss of resolution in the stereo mode, and the display resolution in the plane mode is equal to the physical resolution.

In this implementation example, the device uses a grating to realize the light splitting principle, and the principle of the front and rear gratings is the same. The length c of the display unit, the distance d between the slit grating and the LCD screen, the interpupillary distance u, and the viewing distance L. From Figure 3, the following formula can be obtained.

By changing the distance between the smart backlight and the LCD display, the light forms left and right viewing windows at different distances. The traditional grating light splitting principle has anti-stereo in some areas, that is, the left view enters the right pupil, and the right view enters the left pupil. As shown in FIG. 4 , the anti-stereoscopic display does not have a good stereoscopic effect and may cause visual discomfort.

In this implementation example, the device uses a spatial light modulator, that is, a liquid crystal display, which can realize arbitrary switching of the left and right viewing windows by means of light modulation. When the viewer watches in different positions, the control engine can switch the mode by adjusting the spatial light modulator, so that the left and right viewing windows can be converged on the left and right pupils of the viewer, and the left and right views can be projected to the left and right pupils respectively. As shown in Figure 1, when the viewer is moving, the viewer position detection module captures the position information of the left and right pupils through the camera, and the spatial light modulator changes the modulation mode according to its position movement, so that the left and right viewing windows always follow the movement of the left and right pupils, for example In the process of moving from the viewing position A to the viewing position B, the converging position of the viewing window changes, but it always coincides with the left and right pupils, realizing the purpose of viewing stereoscopic images freely.

In this implementation example, the device uses a position adjustment mechanism to realize the convergence of the left and right viewing windows at different distances, as shown in Figure 2. After the viewer's spatial position detection device detects that the distance between the viewer and the device changes, the control engine issues instructions to control the position adjustment structure to adjust the distance between the spatial light modulator and the intelligent backlight, thereby realizing the formation of left and right viewing windows at different distances. The distance between the spatial light modulator and the intelligent backlight has a corresponding mathematical relationship with the distance between the left and right viewing windows. L1, L2, and L3 represent different viewing distances, and d1, d2, and d2 represent the distance between the spatial light modulator and the intelligent backlight. distance. The corresponding relationship between the two is:

According to the optical principle, the change of the distance between the spatial light modulator and the smart backlight will cause the left and right viewing windows to move back and forth. After the viewer spatial position detection module detects that the distance between the viewer and the device changes, the control engine controls the position adjustment mechanism to adjust the distance between the spatial light modulator and the intelligent backlight, so that the left and right viewing windows can converge at a specific distance. The spatial light modulator and the intelligent backlight are connected by a high-precision screw, which can maintain relative parallelism in the process of stationary and relative movement.

In this implementation example, the device uses an intelligent backlight, as shown in Figure 5. The control engine can control the smart backlight to emit different light. The smart backlight generates diffuse light when it detects displaying flat content, and generates slit light when it detects displaying stereoscopic content. The light source consists of ordinary white LEDs in an array pattern. The light passes through the electronically controlled diffusion film. In the three-dimensional mode, the light is compressed and emitted from the slit to form a uniform slit light. In planar mode, the electronically controlled diffuser plate is equivalent to a common diffuser film, forming the diffused light required for planar display.

In this implementation example, the viewer spatial position detection module is composed of hardware and software. The camera captures the position information of the viewer, including the distance between the viewer and the device, pupil position information, etc. The control engine adjusts the distance between the spatial light modulator and the intelligent backlight according to the position information of the viewer, and at the same time realizes the switching of the dimming mode of the spatial light modulator.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention may make various changes and modifications without departing from the scope of the spirit of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (10)

1. An auxiliary stereoscopic display device using a spatial light modulator, which is characterized in that it includes a spatial light modulator composed of a viewer's spatial position detection module, a position adjustment mechanism, an intelligent backlight, and a liquid crystal display; the position adjustment mechanism is placed on the intelligent backlight Between the spatial light modulators; the length c of the display unit of the liquid crystal display, the distance d between the slit grating and the liquid crystal display, and the interpupillary distance u of the viewer; After the viewer's spatial position detection module detects that the distance between the viewer and the smart backlight changes, the control engine of the position adjustment mechanism issues instructions to control the position adjustment structure to adjust the distance between the spatial light modulator and the smart backlight, so as to realize the formation of different distances. The left and right viewing windows, that is, the left and right viewing windows are converged at a specific distance; the distance between the spatial light modulator and the intelligent backlight has a corresponding mathematical relationship with the distance between the left and right viewing windows, L1, L2 and L3 represent different viewing distances, d1, d2 and d2 represent the distance between the spatial light modulator and the smart backlight lighting plane; the corresponding relationship between the two is: Different viewing distances for L1, L2 and L3 respectively. 2. The unassisted three-dimensional display device according to claim 1, characterized in that the control engine of the intelligent backlight controls the intelligent backlight to emit different light rays, and when the content of the display plane is detected, the intelligent backlight produces diffused light, and when the three-dimensional display is detected The smart backlight produces a slit light when viewing content. 3. The unassisted three-dimensional display device according to claim 1, characterized in that the spatial light modulator and the intelligent backlight are connected by high-precision electric screw rods (especially by three high-precision electric screw rods), and can be used at rest and relative Can keep relatively parallel in the process of moving. The control engine of the spatial light modulator controls the movement of the high-precision electric screw to adjust the distance between the spatial light modulator and the intelligent backlight. 4. The unassisted stereoscopic display device according to claim 1, characterized in that the spatial light modulator adopts an ultra-high-definition liquid crystal display. 5. The unassisted three-dimensional display device according to claim 4, characterized in that the spatial position detection module of the viewer is used to detect the distance between the viewer and the device in real time, and realize high-precision pupil tracking; the spatial light modulator The control engine adjusts the spatial light modulator to switch modes through the position information and distance information adjustment device, so that the left and right viewing windows can be converged on the left and right pupils of the viewer, and the left and right views are respectively projected to the left and right pupils; the left and right observation windows can be moved with the left and right pupils, Ensure that the left and right views enter the viewer's left and right pupils, respectively. 6. The unassisted stereoscopic display device according to claim 4, characterized in that the spatial light modulator and the intelligent backlight are connected by a high-precision screw, and can be kept relatively parallel in the process of stationary and relative movement. 7. The unassisted three-dimensional display method using the spatial light modulator, which is characterized in that the spatial position detection module of the viewer detects the distance between the viewer and the device in real time, and realizes high-precision pupil tracking, and adjusts the spatial light modulator for mode switching , realize the convergence of the left and right viewing windows in the left and right pupils of the viewer, and project the left and right views to the left and right pupils respectively; the control engine adjusts the device through position information and distance information to realize the movement of the left and right observation windows with the left and right pupils, ensuring that the left and right views enter the viewer respectively After the distance between the viewer and the device changes, the control engine of the spatial light modulator issues a command to control the position adjustment mechanism to change the distance between the spatial light modulator and the intelligent backlight, so that the left and right viewing windows are in different positions. Convergence is realized by distance; the control engine of the spatial light modulator can control the intelligent backlight to provide different light sources according to different display contents, emit slit light in stereoscopic mode, and emit diffuse light in planar mode; The smart backlight 2 control engine can control the smart backlight to provide different light sources according to the different display contents. It emits slit light in stereoscopic mode and diffuse light in planar mode. The viewer spatial position detection module can detect the distance between the viewer and the device in real time, and realize high-precision pupil tracking. The control engine adjusts the device through position information and distance information to realize the movement of the left and right observation windows with the left and right pupils, ensuring that the left and right views enter the viewer's left and right pupils respectively. 8. The unaided stereoscopic display method according to claim 7, characterized in that the spatial light modulator, that is, the liquid crystal display, adopts a grating to realize the light splitting principle, and the principle of the front and rear gratings is the same. The length c of the display unit, the distance between the slit grating and the LCD screen d, the interpupillary distance u, and the viewing distance L; through the way of light modulation, the arbitrary exchange of the left and right viewing windows is realized. When the viewer watches in different positions, the control engine switches the mode by adjusting the spatial light modulator, so that the left and right viewing windows can be converged on the left and right pupils of the viewer, and the left and right views are projected to the left and right pupils respectively; The distance between the spatial light modulator and the intelligent backlight has a corresponding mathematical relationship with the distance between the left and right viewing windows. L1, L2, and L3 represent different viewing distances, and d1, d2, and d2 represent the distance between the spatial light modulator and the intelligent backlight. distance; the corresponding relationship between the two is: $\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; c</span>}\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; u</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 3</span>}$ According to the optical principle, the change of the distance between the spatial light modulator and the intelligent backlight will cause the left and right viewing windows to move back and forth; after the viewer spatial position detection module detects that the distance between the viewer and the device changes, the control engine controls the position The adjustment mechanism adjusts the distance between the spatial light modulator and the intelligent backlight, so that the left and right viewing windows can converge at a specific distance. 9. The unassisted stereoscopic display method according to claim 7, characterized in that a position adjustment mechanism is used to realize multi-distance viewing. The spatial light modulator and the intelligent backlight are parallel to each other and keep parallel to each other during the movement. 10. The unaided three-dimensional display method according to claim 7, characterized in that an intelligent backlight is adopted. The control engine can control the smart backlight to emit different lights; when it detects displaying flat content, the smart backlight generates diffuse light; when it detects displaying three-dimensional content, the smart backlight generates slit light.