Naked-eye three-dimensional display device and control method thereof

Abstract

The invention relates to a naked-eye three-dimensional display device and a control method thereof, the naked-eye three-dimensional display device comprises a detection device, a display screen, a liquid crystal box and a light splitting element, and the detection device is used for obtaining the current viewpoint position of an observer; the display screen is used for displaying a composite image, the liquid crystal box is arranged on the display side of the display screen, and the liquid crystal box is used for selectively shifting the composite image to form an intermediate image; the light splitting element is arranged on the side, away from the display screen, of the liquid crystal box and used for separating the middle image into a parallax image and outputting the parallax image to the current viewpoint position. The synthesized image is shifted through the liquid crystal box to achieve viewpoint adjustment, the structure is simple, the adjustment precision is high, and the visual effect can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of naked-eye three-dimensional display, and in particular to a naked-eye three-dimensional display device and a control method thereof. Background Art

[0002] A glasses-free 3D display primarily consists of a display screen and a spectrometer. The display screen provides image information, while the spectrometer optically controls the display light, directing images from different perspectives to the viewer's left and right eyes. This creates a stereoscopic visual effect, providing a 3D experience with a sense of depth without the need for any auxiliary equipment.

[0003] Viewpoint adjustment is necessary to adapt to changes in the viewer's position and ensure that both eyes receive the correct viewing angle. Currently, two main approaches are used: one is to mechanically adjust the relative position between the display and the spectrometer to change the spatial position of the viewpoint, but this is subject to issues such as complex structure and limited adjustment accuracy. The other method achieves viewpoint control by adjusting the sub-pixel mapping relationship. However, based on multi-viewpoint technology, this can significantly reduce the resolution of the 3D display and cause image flicker due to the discrete viewpoint positions and jerky switching. Summary of the Invention

[0004] The embodiments of the present application provide a naked-eye three-dimensional display device and a control method thereof, which realize viewpoint adjustment, have a simple structure, high adjustment accuracy, and can enhance visual effects, thereby at least partially solving the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a naked-eye three-dimensional display device is provided, comprising:

[0006] A detection device for obtaining the current viewpoint position of the observer;

[0007] a display screen for displaying the composite image;

[0008] a liquid crystal cell, disposed on a display side of the display screen, the liquid crystal cell being configured to selectively shift the composite image to form an intermediate image; and

[0009] The light-splitting element is provided on a side of the liquid crystal box away from the display screen, and is used for separating the intermediate image into parallax images and outputting the parallax images to the current viewpoint position.

[0010] Optionally, the naked-eye three-dimensional display device further includes a processor, and the processor is configured to control a deflection angle of liquid crystal molecules in the liquid crystal box based on the current viewpoint position.

[0011] Optionally, the display screen includes a circuit board assembly, the circuit board assembly includes an adjustable power supply, and the adjustable power supply is electrically connected to the liquid crystal box.

[0012] Optionally, the display screen includes a display module and a transparent cover plate provided on a light-emitting side of the display module;

[0013] The liquid crystal box includes a first conductive layer, a first alignment layer, a liquid crystal layer, a second alignment layer and a second conductive layer arranged in sequence. The first conductive layer is attached to a side of the transparent cover plate away from the display module.

[0014] Optionally, the liquid crystal box includes a first conductive layer, a first alignment layer, a liquid crystal layer, a second alignment layer and a second conductive layer arranged in sequence, and the second conductive layer is attached to the light-splitting element.

[0015] Optionally, the liquid crystal cell includes a first substrate, a first conductive layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second conductive layer and a second substrate arranged in sequence;

[0016] Wherein, the first substrate and the display screen are bonded together; and / or the second substrate and the light splitting element are bonded together.

[0017] Optionally, the detection device includes a camera; and / or,

[0018] The light splitting element includes a cylindrical lens array or a slit grating.

[0019] Optionally, the liquid crystal cell is configured such that when no driving voltage is applied, the long axes of the liquid crystal molecules in the liquid crystal cell are arranged obliquely with respect to the display surface of the display screen.

[0020] According to a second aspect of the present application, a control method for a naked-eye 3D display device is provided, which is applied to any one of the above naked-eye 3D display devices, and the control method includes:

[0021] Get the current viewpoint position of the observer;

[0022] A driving voltage is applied to the liquid crystal cell based on the current viewpoint position.

[0023] Optionally, applying a driving voltage to the liquid crystal box based on the current viewpoint position includes:

[0024] A corresponding driving voltage is determined based on a mapping relationship table and the current viewpoint position, wherein the mapping relationship table includes a corresponding relationship between the driving voltage and the current viewpoint position.

[0025] Optionally, obtaining the current viewpoint position of the observer includes: obtaining a first viewpoint position of the observer at a first time, and a second viewpoint position of the observer at a second time, where the second time is after the first time;

[0026] The applying a driving voltage to the liquid crystal box based on the current viewpoint position includes: when the difference between the first viewpoint position and the second viewpoint position is greater than a preset value, applying a driving voltage to the liquid crystal box based on the second viewpoint position at the second time.

[0027] Optionally, applying a driving voltage to the liquid crystal box based on the current viewpoint position further includes:

[0028] When the difference between the first viewpoint position and the second viewpoint position is less than or equal to a preset value, no driving voltage is applied to the liquid crystal box based on the second viewpoint position at the second time, or the driving voltage applied to the liquid crystal box at the first time is maintained.

[0029] Optionally, the control method further includes:

[0030] determining a disparity image based on the current viewpoint position;

[0031] A synthetic image is generated based on the parallax image.

[0032] Optionally, obtaining the current viewpoint position of the observer includes: obtaining a first viewpoint position of the observer at a first time, and a second viewpoint position of the observer at a second time, where the second time is after the first time;

[0033] The determining of the disparity image based on the current viewpoint position includes: when a difference between the first viewpoint position and the second viewpoint position is greater than a preset value, determining the disparity image based on the second viewpoint position at the second time.

[0034] Optionally, the determining the disparity image based on the current viewpoint position further includes:

[0035] When the difference between the first viewpoint position and the second viewpoint position is less than or equal to a preset value, a parallax image is not determined based on the second viewpoint position at the second time.

[0036] Optionally, generating a synthetic image according to the parallax image and applying a driving voltage to the liquid crystal box based on the current viewpoint position are performed simultaneously.

[0037] Optionally, the preset value is between 1 mm and 3 mm.

[0038] Optionally, the step of obtaining the current viewpoint position of the observer includes:

[0039] Get the current viewpoint position of the observer once every preset time interval.

[0040] Optionally, the preset duration is shorter than a refresh cycle of the display screen.

[0041] In the naked-eye three-dimensional display device of the embodiment of the present application, the detection device obtains the current viewpoint position of the observer. When the inherent optical configuration of the display screen and the spectroscopic element can directly output the parallax image to the current viewpoint position, the liquid crystal box remains in its initial state and no additional adjustment is performed. If the inherent optical configuration of the display screen and the spectroscopic element cannot directly output the parallax image to the viewpoint position, the birefringence effect of the liquid crystal box is precisely controlled to controllably refract the light emitted from the display screen, adjust the position of the composite image, and offset it to the compensation position to form an intermediate image. In this way, the intermediate image adjusted by the liquid crystal box enables the spectroscopic element to separate the parallax image and accurately project it to the current viewpoint position, ensuring that the human eye can obtain the parallax image. This embodiment uses a method of regulating the liquid crystal box to achieve viewpoint adjustment. Compared with the method of mechanically adjusting the relative position between the display screen and the spectroscopic element, this method avoids a complex mechanical structure and overcomes the problem of limited adjustment accuracy. It not only simplifies the device structure but also improves the adjustment accuracy. Furthermore, this embodiment uses a liquid crystal cell to shift the light, adjusting only the position of the composite image without affecting its resolution. This also reduces flicker, resulting in clearer images and more stable visuals. In summary, using a liquid crystal cell to shift the composite image to achieve viewpoint adjustment offers a simple structure, high adjustment precision, and enhanced visual quality.

[0042] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0044] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0045] Figure 1 is a schematic structural diagram of a naked-eye three-dimensional display device provided in an exemplary embodiment of the present disclosure;

[0046] Figure 2 yes Figure 1 A structural diagram of a display screen, a liquid crystal cell and a light-splitting element in FIG.

[0047] Figure 3 yes Figure 1 Another structural diagram of the display screen, liquid crystal cell and light splitting element in FIG.

[0048] Figure 4 yes Figure 1 Schematic diagram of the working principle of the naked eye three-dimensional display device;

[0049] Figure 5 yes Figure 4 Schematic diagram of calculation of offset distance of liquid crystal cell to synthetic image;

[0050] Figure 6 1 is a schematic diagram of the spatial position of the display screen and the cylindrical lens array;

[0051] Figure 7 is a schematic diagram of the working principle of a liquid crystal cell provided in an exemplary embodiment of the present disclosure;

[0052] Figure 8 is a schematic diagram of the working principle of another liquid crystal cell provided in an exemplary embodiment of the present disclosure;

[0053] Figure 9 is a first flow chart of a method for controlling a naked-eye three-dimensional display device provided in an exemplary embodiment of the present disclosure;

[0054] Figure 10 is a second flow chart of a method for controlling a naked-eye three-dimensional display device provided in an exemplary embodiment of the present disclosure;

[0055] Figure 11 is a third flow chart of a method for controlling a naked-eye three-dimensional display device provided in an exemplary embodiment of the present disclosure;

[0056] Figure 12 4 is a schematic diagram of a fourth flow chart of a method for controlling a naked-eye three-dimensional display device provided in an exemplary embodiment of the present disclosure.

[0057] Description of reference numerals:

[0058] 100. Naked-eye three-dimensional display device; 1. Detection device; 2. Display screen; 21. Display module; 22. Transparent cover; 23. Pixel; 231. Sub-pixel; 3. Liquid crystal box; 31. First substrate; 32. First conductive layer; 33. First orientation layer; 34. Liquid crystal layer; 35. Second orientation layer; 36. Second conductive layer; 37. Second substrate; 4. Spectral element; 41. Cylindrical lens array; 5. Adjustable power supply; 6. Processor; 200. Synthetic image; 300. Intermediate image; 400. Viewpoint position; 500. Human eye. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0060] The present application provides a naked-eye three-dimensional display device. Figures 1 to 3 This is a schematic structural diagram of a naked-eye three-dimensional display device provided in an embodiment of the present application.

[0061] See Figure 1 and Figure 4 The naked-eye three-dimensional display device 100 includes a detection device 1, a display screen 2, a liquid crystal box 3 and a spectroscopic element 4. The detection device 1 is used to obtain the current viewpoint position 400 of the observer. The display screen 2 is used to display the synthetic image 200. The liquid crystal box 3 is arranged on the display side of the display screen 2. The liquid crystal box 3 is used to selectively offset the synthetic image 200 to form an intermediate image 300; the spectroscopic element 4 is arranged on the side of the liquid crystal box 3 away from the display screen 2. The spectroscopic element 4 is used to separate the intermediate image 300 into parallax images and output the parallax images to the current viewpoint position 400.

[0062] In the naked-eye 3D display device 100 of the embodiment of the present application, the detection device 1 obtains the current viewpoint position 400 of the observer. When the inherent optical configuration of the display screen 2 and the light-splitting element 4 can directly output the parallax image to the current viewpoint position 400, the liquid crystal cell 3 maintains the initial state without additional adjustment (see Figure 4 If the inherent optical configuration of the display screen 2 and the beam splitter 4 cannot directly output the parallax image to the viewpoint position 400, then by precisely controlling the birefringence effect of the liquid crystal cell 3, the light emitted from the display screen 2 is controllably refracted, and the position of the composite image 200 is adjusted and shifted to the compensation position to form an intermediate image 300 (see Figure 4The middle schematic diagram and the right schematic diagram of the image are shown). In this way, the intermediate image 300 adjusted by the liquid crystal box 3 enables the spectroscopic element 4 to separate the parallax image and accurately project it to the current viewpoint position 400, ensuring that the human eye 500 can obtain the parallax image. This embodiment adopts the method of regulating the liquid crystal box 3 to achieve viewpoint adjustment. Compared with the method of mechanically adjusting the relative position between the display screen 2 and the spectroscopic element 4, this method avoids the complex mechanical structure and overcomes the problem of limited adjustment accuracy. It not only simplifies the device structure, but also improves the adjustment accuracy. In addition, this embodiment uses the liquid crystal box 3 to offset the light, which only adjusts the position of the composite image 200 and does not affect the resolution of the composite image 200. At the same time, it reduces the occurrence of screen flickering, making the image clearer and the visual more stable. In summary, the composite image 200 is offset by the liquid crystal box 3 to achieve viewpoint adjustment. It has a simple structure, high adjustment accuracy, and can enhance the visual effect. For the convenience of representation, Figure 4 The figure shows the 3D display effect under two viewpoints, where the display screen 2 displays a composite image 200. The composite image 200 passes through the liquid crystal cell 3 to form an intermediate image 300. The intermediate image 300 is then modulated by the spectroscopic element 4 to reach the preset viewpoint position 400 and finally enter the corresponding human eye 500. The liquid crystal cell 3 only shifts the position of the composite image 200. By controlling the birefringence effect of the liquid crystal cell 3, the offset distance of the composite image 200 can be controlled. Figure 4 As can be seen in the figure, as the human eye 500 moves upward, the composite image 200 is shifted downward by the liquid crystal cell 3, resulting in relative displacement between the composite image 200 and the light-splitting element 4. Consequently, the viewpoint 400 also shifts upward as a whole, maintaining alignment with the human eye 500. The movement distance of the composite image 200 is limited by the performance of the liquid crystal cell 3. The maximum distance the composite image 200 can move must be greater than or equal to the width of a sub-pixel 231 on the display screen 2. (When the maximum distance the composite image 200 moves equals the width of a sub-pixel 231, the left and right viewpoints are interchanged.)

[0063] In some embodiments, see Figure 1The naked-eye 3D display device 100 also includes a processor 6, which is configured to control the deflection angle of the liquid crystal molecules in the liquid crystal cell 3 based on the current viewpoint position 400. In these embodiments, because the processor 6 can quickly process data and generate control signals, the offset adjustment of the liquid crystal molecules is completed quickly, improving the system's response speed, reducing latency, and making viewpoint adjustment smoother. Furthermore, the introduction of the processor 6 enhances the overall system's intelligence. By analyzing the observer's viewpoint position 400 in real time and automatically adjusting the operating state of the liquid crystal cell 3, the system can adapt to changes in the observer's viewpoint position 400 without manual intervention, thereby enhancing the observer's experience. The deflection angle of the liquid crystal molecules is precisely controlled by the processor 6, avoiding the mechanical errors associated with traditional mechanical adjustment. This high-precision control further optimizes the viewpoint adjustment effect, ensuring that the parallax image is accurately aligned with the observer's left and right eyes. By centrally managing the control operations of the liquid crystal cell 3 through the processor 6, the reliance on complex external mechanical structures or additional drive components is reduced, thereby simplifying the overall system hardware design and reducing manufacturing costs and maintenance difficulties. In summary, by introducing the processor 6 to control the deflection angle of the liquid crystal cell 3, not only the response speed and adjustment accuracy of the system are significantly improved, but also the intelligence level of the system is enhanced and the complexity of the system is simplified, thereby providing a higher quality and more stable 3D visual experience and improving the observer experience. A schematic diagram of the calculation of the offset distance of the liquid crystal cell 3 to the synthetic image 200 is shown. In order to clearly show the offset distance, Figure 5 The trajectory of a single beam of light is used to represent the polarized light. The polarized light enters the liquid crystal cell 3 vertically, and its polarization direction is parallel to the orientation direction of the liquid crystal molecules. Assume that at this time, the long axis of the liquid crystal molecules forms a certain angle θ with the display surface of the display screen 2. This angle can be controlled by designing the pre-tilt angle of the orientation layer and the applied driving voltage. Due to the birefringence effect of the liquid crystal molecules, the light beam will be deflected when entering the liquid crystal layer 34, and the deflection angle It can be calculated by the following formula:

[0064]

[0065] Among them, n o is the ordinary refractive index of the liquid crystal molecules, n e is the anomalous refractive index of the liquid crystal molecules. When the light beam exits the liquid crystal layer 34, it exits perpendicular to the liquid crystal layer 34. Therefore, the offset distance h can be calculated using the following formula:

[0066]

[0067] Wherein, L is the thickness of the liquid crystal layer 34. Thus, the deflection angle of the liquid crystal molecules can be controlled by applying voltage. This enables precise control of the image offset distance h.

[0068] In some embodiments, the display screen 2 includes a circuit board assembly (not shown), which includes an adjustable power supply 5 electrically connected to the liquid crystal cell 3. In these embodiments, the adjustable power supply 5 can provide precise and stable voltage output as needed, thereby enabling fine adjustment of the deflection angle of the liquid crystal molecules in the liquid crystal cell 3. This high-precision control ensures accurate light refraction, enabling parallax images to be accurately projected to the viewer's left and right eyes, improving the quality and stability of the 3D display. Because the adjustable power supply 5 can directly and quickly adjust the voltage, the offset of the liquid crystal molecules can be quickly adjusted, reducing latency and enabling smoother viewpoint adjustment, ensuring a seamless 3D visual experience even when the viewer is moving. The adjustable power supply 5, integrated into the circuit board assembly, provides a stable and consistent voltage output, avoiding voltage instability caused by external power supply fluctuations or other factors. This stability further enhances system reliability, ensuring that image distortion or flickering will not occur during extended use. Integrating the adjustable power supply 5 into the circuit board assembly of the display screen 2 reduces the need for complex external power management equipment and simplifies the overall system hardware design. This not only reduces manufacturing costs but also eases maintenance, improving the overall operability and ease of maintenance of the system. In summary, in these embodiments, by integrating the adjustable power supply 5 onto the circuit board assembly of the display screen 2 and electrically connecting it to the liquid crystal cell 3, precise control of the deflection angle of the liquid crystal molecules is achieved. This approach not only significantly improves the system's response speed and adjustment accuracy, but also enhances system stability and display quality, while simplifying hardware design and reducing manufacturing and maintenance costs. Ultimately, this design provides viewers with a more stable, high-quality 3D visual experience.

[0069] In some embodiments, see Figure 2The display screen 2 includes a display module 21 and a transparent cover plate 22 located on the light-emitting side of the display module 21. The liquid crystal cell 3 includes a first conductive layer 32, a first alignment layer 33, a liquid crystal layer 34, a second alignment layer 35, and a second conductive layer 36, arranged in sequence. The first conductive layer 32 is attached to the side of the transparent cover plate 22 facing away from the display module 21. In these embodiments, the display screen 2 is composed of the display module 21 and the transparent cover plate 22, wherein the transparent cover plate 22 is located on the light-emitting side of the display module 21 to provide protection and transmit light. The liquid crystal cell 3 includes a first conductive layer 32, a first alignment layer 33, a liquid crystal layer 34, a second alignment layer 35, and a second conductive layer 36. The first conductive layer 32 is located at the outermost layer of the liquid crystal cell 3, directly attached to the side of the transparent cover plate 22 facing away from the display module 21. This layer is typically made of a transparent conductive material and is used to apply a voltage to control the deflection of the liquid crystal molecules. The first alignment layer 33, located adjacent to the first conductive layer 32, is used to initially align the liquid crystal molecules, ensuring they maintain a specific directionality when no voltage is applied, thereby affecting their optical properties. A liquid crystal layer 34, containing liquid crystal molecules, is located between the first and second alignment layers 33 and 35. These molecules deflect under the influence of different voltages, altering the refraction path of light and thereby adjusting the image. Opposite the first alignment layer 33, the second alignment layer 35 also serves to initially align the liquid crystal molecules, ensuring they maintain a specific directionality when no voltage is applied. The second conductive layer 36, located on the other side of the liquid crystal cell 3 and typically also made of a transparent conductive material, works in conjunction with the first conductive layer 32 to control the deflection angle of the liquid crystal molecules by applying a voltage. This design enables the liquid crystal cell 3 to precisely control the refraction path of light, dynamically adjusting the position of the composite image 200 based on the viewer's viewpoint 400 to form an intermediate image 300, which is then separated by the beam splitter 4 into parallax images suitable for the left and right eyes. In summary, in these embodiments, by integrating the liquid crystal box 3 into the structure of the display screen 2 and utilizing a multi-layer structure to achieve precise control of the liquid crystal molecules, a high-quality 3D visual experience is ensured. This design not only improves the response speed and adjustment accuracy of the system, but also enhances the stability and display quality of the system, while simplifying the hardware design and reducing manufacturing and maintenance costs. The material of the transparent cover 22 is not limited and can be a transparent glass cover or a transparent plastic cover. The first conductive layer 32 and the second conductive layer 36 are made of transparent conductive materials such as indium tin oxide (ITO) and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS). The first orientation layer 33 and the second orientation layer 35 can be materials such as polyimide (PI). The liquid crystal layer 34 plays the role of image shift and uses a liquid crystal material with large birefringence and fast response speed.

[0070] In some embodiments, continue to see Figure 2The liquid crystal cell 3 includes a first conductive layer 32, a first alignment layer 33, a liquid crystal layer 34, a second alignment layer 35, and a second conductive layer 36, arranged in sequence. The second conductive layer 36 is bonded to the beam splitter 4. In these embodiments, the second conductive layer 36 is directly bonded to the beam splitter 4. This design enables the liquid crystal cell 3 to precisely control the refraction path of light, dynamically adjusting the position of the composite image 200 according to the viewer's viewpoint 400 to form an intermediate image 300, which is then separated by the beam splitter 4 into parallax images suitable for the left and right eyes. Because the second conductive layer 36 is directly bonded to the beam splitter 4, it reduces reflections and scattering that may occur during light propagation, improves the overall system transmittance, and further enhances display quality. Furthermore, directly integrating the liquid crystal cell 3 with the beam splitter 4 simplifies the structure of the entire display device, reduces manufacturing costs and maintenance, and improves system reliability and stability. In summary, in these embodiments, by tightly integrating the liquid crystal cell 3 with the beam splitter 4 and utilizing a multi-layer structure to achieve precise control of the liquid crystal molecules, a high-quality 3D visual experience is ensured. This design not only improves the response speed and adjustment accuracy of the system, but also enhances the stability and display quality of the system, while simplifying the hardware design and reducing manufacturing and maintenance costs. It is understandable that this embodiment and the previous embodiment can exist at the same time.

[0071] In some embodiments, see Figure 3 The liquid crystal cell 3 includes a first substrate 31, a first conductive layer 32, a first alignment layer 33, a liquid crystal layer 34, a second alignment layer 35, a second conductive layer 36, and a second substrate 37, arranged in sequence. The first substrate 31 is bonded to the display screen 2. In these embodiments, by adjusting the voltage between the first conductive layer 32 and the second conductive layer 36, the deflection angle of the liquid crystal molecules can be precisely controlled, thereby achieving fine adjustment of the light path and ensuring that the parallax image is accurately projected to the observer's left and right eyes. The design of the first substrate 31 directly bonded to the display screen 2 not only reduces the reflection and scattering that may be encountered during light propagation, thereby improving the transmittance of the entire system and further enhancing display quality, but also reduces the overall thickness of the device by reducing the gaps between components, thereby improving the integration level.

[0072] In some embodiments, continue to see Figure 3The liquid crystal cell 3 includes a first substrate 31, a first conductive layer 32, a first alignment layer 33, a liquid crystal layer 34, a second alignment layer 35, a second conductive layer 36, and a second substrate 37, which are arranged in sequence; wherein the second substrate 37 is bonded to the spectroscopic element 4. In these embodiments, by adjusting the voltage between the first conductive layer 32 and the second conductive layer 36, the deflection angle of the liquid crystal molecules can be precisely controlled, thereby achieving fine adjustment of the light path and ensuring that the parallax image can be accurately projected to the observer's left and right eyes. The design of the second substrate 37 directly bonded to the spectroscopic element 4 not only reduces the reflection and scattering that may be encountered by light during propagation, improves the transmittance of the entire system, and further enhances the display quality, but also reduces the overall thickness of the device by reducing the gap between components, thereby improving the integration level. It is understandable that this embodiment and the previous embodiment can exist at the same time.

[0073] It will be appreciated that the detection device 1 can employ a variety of techniques to obtain the viewer's viewpoint position 400. In some examples, the detection device 1 includes an infrared sensor that can determine the viewpoint position 400 by detecting infrared reflection patterns from the viewer's head and eyes 500. In other examples, an ultrasonic sensor is employed as the detection device 1 to measure the position and orientation of the viewer's head by emitting and receiving ultrasonic signals, thereby inferring the viewpoint position 400.

[0074] In some embodiments, the detection device 1 includes a camera. In these embodiments, the camera can monitor and track the human eye 500 in a non-contact manner, without the observer needing to wear additional equipment or sensors, making the experience more natural and convenient. Modern cameras, combined with advanced image processing algorithms, can achieve high-precision motion capture, thereby accurately tracking the observer's current viewpoint position 400 and its changes. In addition, the camera can operate under different lighting conditions and adapt to various environments by adjusting settings to ensure stable performance. The camera hardware technology is mature and easy to integrate with existing systems, making it easy to implement and expand. With the development of computer vision technology, related algorithms are constantly optimized, further improving the functionality and performance of the tracking system. In addition to providing basic position information, the camera can also capture rich visual data (such as posture, expression, etc.), which helps to enhance the observer's interactive experience. In summary, the use of a camera as a human eye 500 tracker in the naked-eye three-dimensional display device 100 not only achieves accurate viewpoint tracking, but also enhances immersion and flexibility, providing the observer with a better experience.

[0075] It can be understood that the spectroscopic element 4 plays a role in the naked-eye three-dimensional display device 100 in decomposing the composite image 200 into different viewing angle images (i.e., parallax images) suitable for viewing by the left and right eyes. In some examples, the spectroscopic element 4 is a microlens array, which is composed of a large number of tiny lenses, each lens corresponding to a pixel 23 or a group of pixels 23, and is used to control the direction of light. In other examples, the spectroscopic element 4 is a holographic optical element, which uses holographic technology to record and reproduce the interference pattern of light waves, thereby achieving precise control of light. In some other examples, the spectroscopic element 4 is a diffraction grating, which disperses and guides light by etching a periodic structure on the surface of the material so that it propagates at a predetermined angle.

[0076] In some embodiments, the spectroscopic element 4 includes a cylindrical lens array 41 or a slit grating. In these embodiments, compared with other types of spectroscopic elements 4 such as microlens arrays, holographic optical elements, and diffraction gratings, the manufacturing process of the cylindrical lens array 41 is already quite mature and can be mass-produced at a relatively low cost, which is suitable for the large-scale needs of commercial applications. The design and manufacture of the slit grating is relatively simple and easy to integrate with existing liquid crystal displays, which also reduces the development cost and technical threshold. It does not require complex optical elements and can directly add a layer of barrier with slits on the surface of the display screen 2, which is suitable for the modification of existing production lines. In addition, both technologies can maintain stable performance under different lighting conditions and can adapt to a variety of environments, ensuring reliability and stability in different scenarios. In summary, the cylindrical lens array 41 and the slit grating as the spectroscopic element 4 not only provide a cost-effective solution, but also simplify the system integration process, so that the naked-eye three-dimensional display device 100 can be more widely used in consumer electronics and professional fields.

[0077] In one embodiment, see Figure 6An LCD display 2 with a resolution of 1920×1080 and a refresh rate of 60Hz was used. Each pixel 23 contained three sub-pixels 231: red, green, and blue. The sub-pixels 231 were 30 microns wide, and the aspect ratio of the pixels 23 was 1:1. The naked-eye 3D display device 100 was configured with two viewpoints, corresponding to the left and right viewpoints. First, ITO conductive glass was used as the first substrate 31 and second substrate 37 of the liquid crystal cell 3. After cleaning, spin coating with an alignment layer material, baking, and rubbing for alignment, the thickness of the liquid crystal cell 3 was controlled to 100 microns, and a liquid crystal layer 34 was poured. Wires were connected to the first conductive layer 32 and the second conductive layer 36, respectively, and the liquid crystal cell 3 was then attached to the display 2. Next, a cylindrical lens array 41 was used as the light-splitting element 4 and attached to the liquid crystal cell 3. The focal length of the cylindrical lens array 41 was set to the distance from the luminous pixel 23 of the display 2 to the cylindrical lens to ensure that the light is properly focused. The cylindrical lens array 41 is positioned at an angle of arctan(1 / 3) relative to the longitudinal direction of the display screen 2. While this angle is not strictly required, it is closely related to the calculation of the composite image 200. The lateral intercept of the cylindrical lens is 60 microns, covering two sub-pixels 231. This allows the cylindrical lens to effectively refract light emitted by sub-pixels 231 at different locations in two directions, corresponding to the viewer's left and right eyes. During this process, the liquid crystal cell 3 shifts the image without changing the propagation direction or polarization state of the light emitted by the sub-pixels 231. By applying different voltages, the liquid crystal cell 3 can adjust the image offset distance, thereby achieving dynamic adjustment of the viewpoint. The cylindrical lens array 41 acts as a beam splitter 4, refracting light emitted by sub-pixels 231 at different locations on the display screen 2 in two directions, corresponding to the viewer's left and right eyes, allowing the viewer to experience a high-quality naked-eye 3D effect without wearing any auxiliary equipment.

[0078] It is understood that the liquid crystal cell 3 is configured so that when no driving voltage is applied, the long axis of the liquid crystal molecules in the liquid crystal cell 3 is parallel to the display surface of the display screen 2. When the driving voltage is applied, the liquid crystal molecules rotate. Due to the birefringence effect of the liquid crystal, the light beam will be deflected when entering the liquid crystal layer 34. Therefore, the deflection angle of the liquid crystal molecules can be controlled by the magnitude of the applied voltage, thereby controlling the offset distance of the image. In a specific embodiment, see Figure 7 The initial pre-tilt angle of the liquid crystal molecules in the liquid crystal cell 3 is about 2°, so the composite image has no offset in the initial state (see Figure 7 When the applied voltage is 5V, this voltage exceeds the threshold voltage of the liquid crystal device, the liquid crystal molecules begin to deflect, and the composite image 200 is horizontally offset by a certain distance (see Figure 7 When the applied voltage is 8V, the tilt angle of the liquid crystal molecules increases further, and the offset distance of the liquid crystal molecules reaches the maximum (see Figure 7 (right diagram in the figure).

[0079] In some embodiments, the liquid crystal box 3 is configured so that when no driving voltage is applied, the long axis of the liquid crystal molecules in the liquid crystal box 3 is tilted relative to the display surface of the display screen 2. In these embodiments, since the liquid crystal molecules already have the ability to offset in the initial state (when no voltage is applied), in actual use, in order to achieve the target offset, the additional driving voltage required can be significantly reduced. This design effectively reduces the threshold voltage of the liquid crystal device, thereby reducing the overall driving voltage requirement of the system and reducing power consumption. A lower driving voltage means less energy consumption. By optimizing the initial tilt angle of the liquid crystal molecules, the system can achieve the same optical effect with lower energy consumption, thereby improving energy efficiency. Since the required driving voltage is reduced, the deflection process of the liquid crystal molecules is faster, thereby improving the response speed of the system. Rapidly adjusting the state of the liquid crystal molecules can reduce delays, ensure smoother viewpoint adjustment, and enhance the observer experience. The lower driving voltage requirement makes the design of the power management and control circuits simpler, reducing hardware complexity. This not only reduces manufacturing costs, but also improves the reliability and maintainability of the system. As can be understood, see Figure 8 For a specific liquid crystal material, when the tilt angle of the liquid crystal molecules is a specific value, when no voltage is applied, the composite image 200 can achieve the maximum offset distance (see Figure 8 Then, after the driving voltage is applied, the tilt angle of the liquid crystal molecules gradually increases and the offset distance of the display image gradually decreases (see Figure 8 By setting the initial tilt angle of the liquid crystal molecules to a specific value, the system achieves maximum offset capability when no voltage is applied. This fully exploits the optical properties of the liquid crystal material. After voltage is applied, the offset can vary over a wider range, enabling the system to more precisely adjust the image position, thereby providing higher optical efficiency and better image quality.

[0080] According to a second aspect of the present application, a control method for a naked-eye 3D display device 100 is provided, which is applied to any one of the above naked-eye 3D display devices 100. Figure 9 , control methods include:

[0081] S100: Obtain the current viewpoint position of the observer 400;

[0082] S200 : Applying a driving voltage to the liquid crystal cell 3 based on the current viewpoint position 400 .

[0083] In these embodiments, the current viewpoint position 400 of the observer is acquired in real time by the detection device 1, ensuring that the system can adapt to changes in the viewpoint position 400 of the observer. Ideally, the system utilizes the existing optical configuration to directly provide a high-quality 3D image for the current viewpoint position 400. That is, the current viewpoint position 400 is exactly the viewpoint position 400 corresponding to the existing optical configuration (including not only the case where the liquid crystal cell 3 causes the synthesized image 200 to be offset by a certain distance, but also the case where the liquid crystal cell 3 does not offset the synthesized image 200 at all). Therefore, no driving voltage is required, and no additional calibration is required. In cases where adjustment is required, that is, when there is a deviation between the viewpoint position 400 corresponding to the existing optical configuration and the current viewpoint position 400, a driving voltage is applied to the liquid crystal cell 3 to precisely control the birefringence effect of the liquid crystal cell 3 and adjust the offset of the synthesized image 200 by the liquid crystal cell 3 (this includes not only offsetting the synthesized image 200 by different distances, but also adjusting from no offset to offset, or vice versa). Compared to when no driving voltage is applied, the position of composite image 200 has changed. After passing through beam splitter 4, it can be accurately projected to the current viewpoint 400. Liquid crystal cell 3 adjusts the position of composite image 200 without affecting resolution, reducing screen flicker and improving image quality and visual stability. This approach not only improves system response speed and adjustment accuracy, but also enhances system stability and display quality, providing viewers with a more efficient, stable, and high-quality 3D visual experience.

[0084] In some embodiments, the step S200 of applying a driving voltage to the liquid crystal cell 3 based on the current viewpoint position 400 includes:

[0085] S210 : determining a corresponding driving voltage based on a mapping relationship table and the current viewpoint position 400 , wherein the mapping relationship table includes a corresponding relationship between the driving voltage and the current viewpoint position 400 .

[0086] In these embodiments, the mapping table is a data table that contains the correspondence between different viewpoint positions 400 and corresponding driving voltages. This table is pre-generated through experiments or simulations, and each entry in the mapping table contains a specific viewpoint position 400 and its corresponding driving voltage value. For example, when the viewpoint position 400 of the observer is at a specific coordinate, the table records the driving voltage required to accurately project the composite image 200 to that viewpoint position 400. Specifically, after obtaining the current viewpoint position 400 of the observer, the system searches the mapping table for the corresponding driving voltage value based on this position. If the current viewpoint position 400 happens to exactly match a position in the mapping table, the corresponding driving voltage value is directly used. However, more commonly, there is no exact matching entry for the current viewpoint position 400, as the viewpoint position 400 of the observer may be between two known data points. In this case, the system can calculate an appropriate driving voltage value using an interpolation algorithm (such as linear interpolation or bilinear interpolation). This interpolation method ensures a relatively accurate driving voltage even at non-standard viewpoint positions 400, thereby achieving high-quality 3D display effects. Using a pre-established mapping table, the system can provide highly accurate driving voltage values at any viewpoint position 400, avoiding complex real-time calculations, improving system response speed, and ensuring that parallax images are accurately and timely projected to the viewer's left and right eyes, significantly improving display quality and the viewer experience. In some examples, the specific process for establishing the mapping table is as follows: First, a coordinate system is established with the center of the display screen 2 as the origin. This coordinate system is used to determine and record changes in the viewpoint position 400. The initial viewpoint position 400 when no voltage is applied to the liquid crystal cell 3 is measured and recorded. The optical configuration of the device can be adjusted so that this initial viewpoint position 400 is horizontally offset from the center of the display screen 2 by a certain distance, which is set to the maximum horizontal offset of the viewer's head, to cover all possible viewpoint position 400 variations. A driving voltage is applied to the liquid crystal cell 3 according to a preset step size. After each application of the driving voltage, the viewpoint position 400 at the current driving voltage is measured and recorded. The voltage step size needs to be small enough to improve the accuracy of the mapping table, that is, to improve the accuracy of the viewpoint adjustment. As the applied voltage gradually increases, the viewpoint position 400 will also gradually shift accordingly. This process continues until the applied voltage reaches the preset maximum voltage value. At the preset maximum voltage value, the viewer's head should be located at the maximum offset distance on the other side. At this time, the final viewpoint position 400 data is recorded. After completing the above steps, the measurement process ends and a mapping relationship table is generated. The mapping table contains the viewpoint position 400 data corresponding to each voltage value in the range from minimum voltage to maximum voltage.

[0087] In some embodiments, see Figure 10, step S100 of obtaining the current viewpoint position 400 of the observer includes:

[0088] S110: Acquire a first viewpoint position 400 of an observer at a first time, and a second viewpoint position 400 at a second time, where the second time is after the first time;

[0089] The step S200 of applying a driving voltage to the liquid crystal cell 3 based on the current viewpoint position 400 includes:

[0090] S220 : When the difference between the first viewpoint position 400 and the second viewpoint position 400 is greater than a preset value, applying a driving voltage to the liquid crystal cell 3 based on the second viewpoint position 400 at a second time.

[0091] In these embodiments, when a change in viewpoint position 400 is detected that exceeds a preset value, the system can quickly respond and promptly update the drive voltage. By quickly responding and recalculating and applying the drive voltage based on the new viewpoint position 400 (the second viewpoint), the system can ensure that the composite image 200 is accurately projected to the observer's left and right eyes, thereby providing a high-quality 3D visual experience. This approach significantly improves the system's response speed and adjustment accuracy, allowing the observer to obtain a clear and stable 3D image at any viewpoint position 400, ultimately providing the observer with a more efficient, stable, and high-quality 3D visual experience.

[0092] In some embodiments, the step S200 of applying a driving voltage to the liquid crystal cell 3 based on the current viewpoint position 400 further includes:

[0093] S230: When the difference between the first viewpoint position 400 and the second viewpoint position 400 is less than or equal to the preset value, no driving voltage is applied to the liquid crystal box 3 based on the second viewpoint position 400 at the second time, or the driving voltage applied to the liquid crystal box 3 at the first time is maintained.

[0094] In these embodiments, the system not only enables precise adjustments for large changes in viewpoint position 400 (exceeding a preset value), but also maintains existing settings for smaller changes in viewpoint position 400 (less than or equal to a preset value). Specifically, when the change in the observer's viewpoint position 400 is less than or equal to a preset value, the system does not recalculate and apply the drive voltage based on the new viewpoint position 400 (second viewpoint), but instead maintains the previous drive voltage setting. That is, when the change in viewpoint position 400 is within a preset range (less than or equal to a preset value), the system maintains the existing drive voltage setting without making additional adjustments. This approach avoids frequent voltage updates, reduces system energy consumption, and prevents screen flickering that can result from frequent adjustments. By only making adjustments when the viewpoint position 400 changes by more than a preset value, the system can significantly reduce computational overhead. This design enables the system to operate more efficiently and reduces hardware resource utilization. As can be appreciated, even without a drive voltage update for smaller changes in viewpoint position 400, the observer can still receive a clear, undistorted image. This is because within this smaller range, the original image offset still fits the current viewpoint position 400, ensuring accurate projection of the image. In summary, when the viewpoint position 400 changes slightly (i.e., the difference between the first viewpoint position 400 and the second viewpoint position 400 is less than or equal to the preset value), the system does not recalculate and apply the drive voltage based on the new viewpoint position 400, but maintains the previous drive voltage setting. This approach avoids unnecessary adjustments, reduces the system's energy consumption and computational burden, while maintaining image quality and visual stability.

[0095] In some embodiments, see Figure 11 , the control method further includes:

[0096] S300: Determine a disparity image based on the current viewpoint position 400;

[0097] S400: Generate a synthetic image 200 based on the parallax image.

[0098] In these embodiments, parallax images are generated based on the observer's current viewpoint 400 to simulate the different perspectives seen by the left and right eyes in the real world. For example, on the left side of a vase, the left and right eyes see the left portion of the vase, while on the right side, the left and right eyes see the right portion. This parallax is the core of 3D display and provides the observer with a sense of three-dimensionality. The synthesized image 200 processes the parallax image to generate image content suitable for output on the display screen 2. This step focuses on the accuracy of the content, ensuring that the final displayed image can be correctly processed by the spectroscopic element 4 to produce the 3D visual effect that meets the observer's expectations. The system dynamically adjusts the generation of the parallax image by acquiring the observer's viewpoint 400 in real time. This means that no matter how the observer moves their head or eyes 500, the system can determine the correct parallax image based on their current position. For example, as the observer moves from the left to the right side of the vase, the system dynamically switches the parallax image so that the observer always sees the perspective of the vase that matches their viewpoint 400. Because the accuracy of the content of the parallax image and the synthesized image 200 is guaranteed, the observer can see a 3D effect that matches their viewpoint position 400. The 3D image perceived by the observer has a high degree of realism and immersion, enhancing the observer's experience. The system can dynamically adjust the parallax image based on the observer's real-time viewpoint position 400, ensuring that the observer sees the correct perspective at any position, thereby obtaining a true 3D experience. This application does not limit the specific synthesis method for generating the synthesized image 200 from the parallax image. For example, when the light-splitting unit is a cylindrical lens array 41, the synthesis is performed based on parameters such as the placement angle of the cylindrical lens array 41, the lateral intercept of the cylindrical lens array 41, the width of the sub-pixels 231 of the display screen 2, and the number of viewpoints. In some examples, an image library is pre-established, storing a large number of parallax images of 3D scenes and recording the corresponding viewpoint positions 400. When the computer determines the current viewpoint position 400, the corresponding parallax image is used to synthesize the synthesized image 200, thereby ensuring the accuracy of motion parallax.

[0099] In some embodiments, see Figure 12 , step S100 of obtaining the current viewpoint position 400 of the observer includes:

[0100] S110: Acquire a first viewpoint position 400 of an observer at a first time, and a second viewpoint position 400 at a second time, where the second time is after the first time;

[0101] The step S300 of determining a disparity image based on the current viewpoint position 400 includes:

[0102] S310: When the difference between the first viewpoint position 400 and the second viewpoint position 400 is greater than a preset value, a parallax image is determined based on the second viewpoint position 400 at a second time.

[0103] In these embodiments, when the observer's viewpoint position 400 changes by more than a preset value, the system dynamically updates the parallax image to ensure that the displayed content matches the observer's actual viewpoint position 400. Specifically, for example, if the observer's viewpoint position 400 moves from the left side of the vase to the right side, the system adjusts the parallax image from the left side of the vase to the right side based on the new viewpoint position 400. This means that the system regenerates the parallax image to fit the new viewpoint position 400, ensuring that the observer always sees a perspective that matches their current position. This ensures that the perspective images received by the left and right eyes align with real-world visual perception, enhancing the accuracy and immersion of the 3D display. Through this mechanism, the system reduces visual discomfort or distortion caused by viewpoint errors, providing the observer with a more natural and smooth 3D visual experience. Especially when the viewpoint position 400 changes significantly, timely updating of the parallax image ensures that the observer always receives a clear and stable 3D image, enhancing overall immersion and user satisfaction.

[0104] In some embodiments, the step S300 of determining the disparity image based on the current viewpoint position 400 further includes:

[0105] S320: When the difference between the first viewpoint position 400 and the second viewpoint position 400 is less than or equal to the preset value, a parallax image is not determined based on the second viewpoint position 400 at the second time.

[0106] In these embodiments, when the change in the viewpoint position 400 of the observer is less than or equal to a preset value, the system will not regenerate the parallax image based on the new viewpoint position 400, nor will it need to generate a new synthetic image 200. This means that the system can avoid frequent and unnecessary computing tasks and image processing, reducing the burden on the system, improving operating efficiency, and reducing energy consumption. Under smaller changes in the viewpoint position 400, the existing parallax image can still provide high-quality 3D display effects. The system maintains the original parallax image settings, avoiding screen flickering or jittering that may be caused by frequent switching of parallax images. By maintaining the existing parallax image settings, the system ensures the consistency of the displayed content. Even if the observer moves the human eye 500 slightly, the content seen is still continuous and consistent, without sudden changes or distortion, enhancing the sense of immersion, making the 3D experience more natural and realistic, and improving overall user satisfaction. In summary, in these embodiments, when the observer's viewpoint position 400 changes slightly, the system will not regenerate the parallax image and the composite image 200. This method avoids unnecessary computing tasks and image processing, reduces the system's computing burden and energy consumption, and maintains visual stability and content consistency. This not only improves operating efficiency and resource utilization, but also provides the observer with a smoother, more natural and high-quality 3D visual experience. No matter how slightly the observer moves, he can feel a stable 3D effect, which greatly enhances the sense of immersion and user satisfaction.

[0107] In some embodiments, the step S400 of generating the synthetic image 200 according to the parallax image is performed simultaneously with the step S200 of applying a driving voltage to the liquid crystal cell 3 based on the current viewpoint position 400 .

[0108] In these embodiments, when the viewer's viewpoint 400 changes, the system simultaneously generates the composite image 200 and adjusts the driving voltage of the liquid crystal cell 3. This allows the system to complete the necessary calculations and adjustments in the shortest possible time, improving the system's real-time responsiveness, reducing latency, and making the 3D display smoother and more natural. In particular, even when the viewer's head or eyes 500 move rapidly, the system can still react quickly, providing a high-quality 3D visual experience.

[0109] During the synchronous processing, the system can better coordinate the generation of composite image 200 and the state adjustment of liquid crystal cell 3, ensuring that the final displayed image is not only accurate in content but also precisely positioned, avoiding image distortion or ghosting caused by asynchronous processing. In summary, this synchronous update mechanism not only optimizes the system's real-time performance, but also significantly enhances the viewer's immersion and satisfaction, providing a high-quality, stable 3D visual experience.

[0110] In some embodiments, the preset value is between 1 mm and 3 mm. In these implementations, the setting of the preset value range comprehensively considers the visual sensitivity of the human eye 500 and the adjustment accuracy of the system, ensuring that when the viewpoint position 400 changes slightly (i.e., less than or equal to the preset value), the observer can still receive a clear and stable 3D image without frequently adjusting the system parameters. At the same time, when the viewpoint position 400 changes beyond this range, the system can respond in time and make necessary adjustments to ensure the accuracy of the image and the observer's visual experience. By limiting the preset value to between 1 mm and 3 mm, the system achieves a good balance between real-time performance, stability and energy consumption, providing an efficient and high-quality naked-eye 3D display solution.

[0111] In some embodiments, step S100 of obtaining the observer's current viewpoint position 400 includes:

[0112] S120: Obtain the current viewpoint position 400 of the observer once every preset time interval.

[0113] In these embodiments, by setting a fixed detection interval, the system does not need to continuously monitor the observer's viewpoint position 400, but instead periodically acquires data according to a preset duration, significantly reducing the system's computational burden and energy consumption. The method of periodically acquiring the viewpoint position 400 avoids image jitter or flickering caused by too frequent adjustments, while capturing the observer's viewpoint changes in a timely manner, thereby enhancing the observer's sense of immersion and user satisfaction. In some examples, the frequency of acquiring the observer's current viewpoint position 400 is 60 Hz, which means that the system acquires the observer's current viewpoint position 400 60 times per second, that is, an acquisition operation is performed every approximately 16.7 milliseconds, thereby ensuring smooth display.

[0114] In some embodiments, the preset duration is less than the refresh cycle of display screen 2. In these embodiments, by setting the preset duration to be less than the refresh cycle of display screen 2, the system is able to obtain the latest viewpoint position 400 information before each refresh, thereby achieving more accurate and timely image adjustment. This means that each frame of image viewed by the observer is generated based on the latest viewpoint position 400, significantly improving the real-time and synchronization performance of the system, avoiding image misalignment or delay caused by delayed viewpoint position 400 updates, and providing the observer with a smoother and more natural 3D visual experience.

[0115] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0116] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0117] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0118] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A naked-eye three-dimensional display device, characterized in that: include: A detection device for obtaining the current viewpoint position of the observer; a display screen for displaying the composite image; a liquid crystal cell, disposed on a display side of the display screen, the liquid crystal cell being configured to selectively shift the composite image to form an intermediate image; as well as, The light-splitting element is provided on a side of the liquid crystal box away from the display screen, and is used for separating the intermediate image into parallax images and outputting the parallax images to the current viewpoint position.

2. The naked-eye 3D display device according to claim 1, wherein: The naked-eye 3D display device further includes a processor configured to control a deflection angle of liquid crystal molecules in the liquid crystal cell based on the current viewpoint position.

3. The naked-eye 3D display device according to claim 1, wherein: The display screen includes a circuit board assembly, the circuit board assembly includes an adjustable power supply, and the adjustable power supply is electrically connected to the liquid crystal box.

4. The naked-eye three-dimensional display device according to any one of claims 1 to 3, characterized in that: The display screen includes a display module and a transparent cover plate provided on the light-emitting side of the display module; The liquid crystal box includes a first conductive layer, a first alignment layer, a liquid crystal layer, a second alignment layer and a second conductive layer arranged in sequence. The first conductive layer is attached to a side of the transparent cover plate away from the display module.

5. The naked-eye three-dimensional display device according to any one of claims 1 to 3, characterized in that: The liquid crystal box includes a first conductive layer, a first alignment layer, a liquid crystal layer, a second alignment layer, and a second conductive layer which are sequentially arranged. The second conductive layer is attached to the light splitting element.

6. The naked-eye three-dimensional display device according to any one of claims 1 to 3, characterized in that: The liquid crystal cell comprises a first substrate, a first conductive layer, a first alignment layer, a liquid crystal layer, a second alignment layer, a second conductive layer and a second substrate which are arranged in sequence; Wherein, the first substrate and the display screen are bonded together; and / or the second substrate and the light splitting element are bonded together.

7. The naked-eye three-dimensional display device according to any one of claims 1 to 3, characterized in that: The detection device includes a camera; and / or, The light splitting element includes a cylindrical lens array or a slit grating.

8. The naked-eye three-dimensional display device according to any one of claims 1 to 3, characterized in that: The liquid crystal cell is configured such that when no driving voltage is applied, the long axes of the liquid crystal molecules in the liquid crystal cell are arranged obliquely with respect to the display surface of the display screen.

9. A method for controlling a naked-eye three-dimensional display device, characterized in that: Applied to the naked-eye 3D display device according to any one of claims 1 to 8, the control method comprises: Get the current viewpoint position of the observer; A driving voltage is applied to the liquid crystal cell based on the current viewpoint position.

10. The control method according to claim 9, characterized in that: The applying a driving voltage to the liquid crystal box based on the current viewpoint position includes: A corresponding driving voltage is determined based on a mapping relationship table and the current viewpoint position, wherein the mapping relationship table includes a corresponding relationship between the driving voltage and the current viewpoint position.

11. The control method according to claim 9, characterized in that: The obtaining of the current viewpoint position of the observer includes: obtaining a first viewpoint position of the observer at a first time, and a second viewpoint position of the observer at a second time, wherein the second time is after the first time; The applying a driving voltage to the liquid crystal box based on the current viewpoint position includes: when the difference between the first viewpoint position and the second viewpoint position is greater than a preset value, applying a driving voltage to the liquid crystal box based on the second viewpoint position at the second time.

12. The control method according to claim 11, characterized in that: The applying a driving voltage to the liquid crystal box based on the current viewpoint position further includes: When the difference between the first viewpoint position and the second viewpoint position is less than or equal to a preset value, no driving voltage is applied to the liquid crystal box based on the second viewpoint position at the second time, or the driving voltage applied to the liquid crystal box at the first time is maintained.

13. The control method according to claim 9, characterized in that: The control method further includes: determining a disparity image based on the current viewpoint position; A synthetic image is generated based on the parallax image.

14. The control method according to claim 13, characterized in that: The obtaining of the current viewpoint position of the observer includes: obtaining a first viewpoint position of the observer at a first time, and a second viewpoint position of the observer at a second time, wherein the second time is after the first time; The determining of the disparity image based on the current viewpoint position includes: when a difference between the first viewpoint position and the second viewpoint position is greater than a preset value, determining the disparity image based on the second viewpoint position at the second time.

15. The control method according to claim 14, characterized in that: The determining of the disparity image based on the current viewpoint position further includes: When the difference between the first viewpoint position and the second viewpoint position is less than or equal to a preset value, a parallax image is not determined based on the second viewpoint position at the second time.

16. The control method according to claim 9, characterized in that: Generating a synthetic image according to the parallax image is performed synchronously with applying a driving voltage to the liquid crystal cell based on the current viewpoint position.

17. The control method according to any one of claims 11, 12, 14 and 15, characterized in that: The preset value is between 1 mm and 3 mm.

18. The control method according to claim 9, characterized in that: The steps to obtain the current viewpoint position of the observer include: Get the current viewpoint position of the observer once every preset time interval.

19. The control method according to claim 18, characterized in that: The preset duration is shorter than a refresh cycle of the display screen.

Images