Light field seamless splicing display device and light field display system

Abstract

The invention discloses a light field seamless splicing display device and a light field display system, which are characterized in that the seamless splicing display device is not limited to a single screen for display, and a plurality of screens are spliced to be equivalent to a large-size high-resolution screen; a point light source is used for replacing a backlight panel in a conventional display screen, and a novel backlight structure is constructed based on a point light source model, so that the problems of pain points of gaps generated by conventional screen splicing and insufficient space bandwidth product are solved, and the form and application scenarios of the display screen are expanded. In addition, the light field seamless splicing display device is further matched with a light field display system, a point light source is converted into a collimated light source through collimation and light splitting effects of a micro-lens array, a light field image is imaged again on a display plane, and naked eye three-dimensional display is achieved.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and particularly to a light field seamless splicing display device and a light field display system. Background Art

[0002] Current image display technologies are based on the infrastructure of a conventional two-dimensional planar layout, that is, pixels are arranged on a two-dimensional plane to achieve image display. In order to improve the performance of the display, optimization can only be carried out in the two-dimensional space. For example, the pixel size is reduced through manufacturing processes, and the pixel scale is increased (from 2K to 4K, to 8K, and now to 16K, etc.).

[0003] However, due to the limitations of the two-dimensional plane and production costs, the improvement of any one performance of the display will inevitably lead to the reduction of other performances and the increase of costs. For example, increasing the pixel scale will result in a decrease in performances such as the refresh rate, color gamut range, and gray level, and a significant increase in costs.

[0004] Therefore, breaking through the two-dimensional architecture of the current display technology, expanding the structure of the display from two-dimensional to three-dimensional, and using multiple low-performance display panels that can be mass-produced, through a redefined point light source display mode, to construct a high-performance display system with excellent comprehensive indicators, is the main objective of the present invention.

[0005] Moreover, in the current environment, using multiple screens to be spliced into a large high-pixel screen has been considered one of the main methods to overcome the shortage of the spatial bandwidth product, and it has a wide range of applications. Through the splicing of multiple display screens, we can achieve the same display content at a lower cost. This advantage can not only be applied to 2D planar image display, but also be reflected in stereoscopic display fields such as 3D digital sand tables and 3D reconstruction. However, the current multi-display screen splicing technologies on the market are difficult to break away from the limitations of the screen's own boundary gaps and splicing accuracy, and there are various defects:

[0006] 1. Currently, mainstream display screens still cannot achieve true borderlessness in a short time, and gaps will inevitably occur during splicing.

[0007] 2. Large and irregular display screens have high requirements for forming accuracy, so the processing cost is high, which is not conducive to mass production.

[0008] In 3D stereoscopic display, the screen splicing also exposes the following defects:

[0009] 1. The brightness of the stereoscopic image is significantly reduced compared to that of the planar image.

[0010] 2. The viewing field angle is relatively narrow and the resolution is low.

[0011] 3. Due to the existence of gaps, the mutual crosstalk between images and the aberration of the lens array itself affect the imaging quality.

[0012] This system design is based on cutting-edge technologies such as three-dimensional light field display research and geometric optics. Focusing on the deficiencies of current planar and stereoscopic display technologies, a light field seamless splicing display device and a light field display system are proposed to promote the progress of the third-generation display technology. Summary of the Invention

[0013] To solve the above problems, this application provides a light field seamless splicing display device and a light field display system.

[0014] In a first aspect of this application, a light field seamless splicing display device is provided, including:

[0015] A backlight unit for generating the illumination backlight required for display;

[0016] A plurality of display units that are spliced to form a display plane. Each display unit includes a driving module and an LCD module. The driving module is used to acquire and store 2D planar images and / or 3D rendered images and transmit them to the LCD module. The LCD module is illuminated by the illumination backlight and outputs the corresponding 2D planar image or 3D rendered image;

[0017] An auxiliary control unit is signal-connected to the display unit. The auxiliary control unit includes an activation module and a serial port module. The activation module is used to collect and acquire the serial port data sent by the serial port module and generate an activation instruction signal fed back to the display unit. The serial port module is used to connect peripheral components of corresponding interface types for parameter adjustment of the display module.

[0018] In some embodiments, the light field seamless splicing display device further includes a beam shaping unit composed of an extinction module and a light homogenizing module; the beam shaping unit is configured as a pre-combination required for display, and is used to modulate the illumination backlight required for each display unit respectively. The light homogenizing module is provided at the front end of the point light source module and is used to modify the light intensity of scattered light generated by the point light source module at different angles; the extinction module adopts a plurality of frustum-shaped cylinder structures with a wedge-shaped structure inside, and is used to reflect and absorb the diffused light caused by the scattering of the point light source module, and does not change the main light of the point light source module during the extinction operation, and only processes the stray light that needs to be removed.

[0019] In some embodiments, the light field seamless splicing display device further includes a light ray correction unit composed of a seam elimination module and a collimation module; the light ray correction unit is configured to obtain the light ray propagation path of the illumination backlight through the point light source module and the LCD module and infer according to the seam width generated by the splicing of the display units, and the seam elimination module is configured to achieve the remapping from the display plane of each display unit to the seamless state of the collimation module through geometric structure changes, so as to achieve seam elimination; after seam elimination, each display unit is regarded as a coordinated complete display plane, and the artifacts generated at the splicing of each display unit are eliminated to obtain a new imaging plane.

[0020] In some embodiments, the seamless splicing display device further includes a power supply unit, and the backlight unit includes a point light source module;

[0021] The power supply unit includes a voltage stabilization module for providing stable electric energy to the backlight unit and the display unit, and at least includes electric energy of 5V, 12V or other preset levels;

[0022] The point light source module includes point light sources composed of multiple LEDs. The point light source module is configured to provide illumination backlight that covers and lights up the entire display plane, and guide the light ray propagation direction of the illumination backlight through the point light sources composed of multiple LEDs to obtain light rays that are approximately scattered under ideal conditions.

[0023] In some embodiments, the light homogenization module and the light extinction module are physically embedded to achieve lossless light transmission. The lossless transmitted light only includes the main light rays directly mapped on the display unit by the point light source module after divergence through the light extinction structure, and does not include the redundant light rays reflected by the light homogenization module and the stray light that generates diffuse reflection and is removed in the light extinction module.

[0024] In addition, the second aspect of the present application further provides a light field display system, which at least includes a software layer, a peripheral layer, and a control layer. The peripheral layer includes a backlight unit and multiple display units;

[0025] The software layer includes a multi-screen interaction module and a data transmission module; the multi-screen interaction module is configured to provide a window for the user to input a graphical interface or instructions, and execute the coordinated work of multiple display units in the light field seamless splicing display device; the data transmission module is configured to receive and transmit the target picture to be displayed. The target picture includes a 2D planar image and / or a 3D rendered image; the data transmission unit and the multi-screen interaction module use the same end-to-end communication framework from the server to the client to transmit the target picture and deploy the target picture on the display unit;

[0026] The control layer includes a logic control module and an event processing module; the logic control module is used to obtain the application status and / or status information of each display unit from the multi-screen interaction module, generate an electrical signal to activate the display units that need to be applied, and idle the unapplied display units; the event processing module is used to control the interrupt processing and task scheduling events of each display unit with other peripherals.

[0027] In some embodiments, in the peripheral layer, a front-mounted combined light homogenizing module and a light extinction module are configured for each display unit, and the backlight unit includes a point light source module;

[0028] The light homogenizing module includes a plurality of lenses, each corresponding to one of the display units respectively. The light homogenizing module can modify the light intensity of the scattered light generated by the point light source module at different angles, and realize the uniformization of light on the display plane by only changing the light intensity without changing the direction of light divergence; the light homogenizing module has a mathematical model and is expressed as:

[0029]

[0030] where E s represents the same illuminance plane under an ideal point light source, r represents the radius of the concentric spherical surface, that is, the distance from a point on the surface to the point light source, h represents the distance from a point on the concentric spherical section to the point light source, and θ represents the angle between the line connecting any point on the section and the center of the sphere and the central axis;

[0031] The light extinction module includes a plurality of frustum-shaped cylindrical structures with a built-in wedge structure, each corresponding to one of the display units respectively. The light extinction module is used to reflect and absorb the diffused light caused by the scattering of the point light source module through the wedge structure, and does not change the main light of the point light source module during the light extinction operation, and only processes the stray light that needs to be removed.

[0032] In some embodiments, the peripheral layer further includes an independent light slit elimination module and a collimation module integrated in the display unit, and the two are used as a post-mounted combination required for display;

[0033] The light slit elimination module connects adjacent display units and arranges them geometrically to achieve seamless display. By measuring the basic data in the horizontal and vertical directions of the gaps between adjacent display units and controlling the distance from the backlight unit to the display unit, the tilt angle of the light extinction module is adjusted to achieve the directional propagation of the light generated by the point light source module, and the light at the junction of adjacent display units is used to eliminate the gaps;

[0034] The collimation module includes a microlens array required for stereoscopic display. Each microlens array corresponds to a single display unit, collimating the light on the display plane according to the corresponding display unit, and capable of solving the artifacts that may occur at the joints of the display units to obtain a new imaging plane.

[0035] In some embodiments, the peripheral layer further includes a power supply unit and a serial port module;

[0036] The point light source module is connected to the power supply unit to obtain the required electric energy. The point light source module includes a point light source composed of multiple LEDs. The point light source module is used to provide illumination backlight that covers and lights up the entire display plane, and guides the light propagation direction of the illumination backlight through the point light source composed of the multiple LEDs to obtain light scattered under approximately ideal conditions;

[0037] The serial port module is used to connect input peripheral devices and obtain and input to the control layer one or more of the instruction information of the software layer and the application information of the display unit.

[0038] In some embodiments, the peripheral layer is integrated on the light field seamless splicing display device. The backlight unit, the light homogenizing module, the light extinction module, and the collimation module in the peripheral layer all correspond to independent display units one by one and form the minimum system of light field display. Therefore, the complete light field display system includes any number of combinations with the same number of each module and display unit, and this combination characteristic realizes the scalability of the light field display system.

[0039] The beneficial effects of this application are:

[0040] The light field seamless splicing display device and light field display system according to the above embodiments. Since the light field seamless splicing display device, the backlight unit is composed of point light sources, replacing the traditional large-area backlight panel. Under the condition of being able to light up the display unit, the light uniformity and effectiveness are realized through the supporting light correction unit. The light correction unit is used to eliminate the screen gap generated by splicing on this basis, so as to construct and optimize a complete display plane. Compared with the traditional splicing screen, the device and its system have a higher lossless resolution and a significant improvement in display efficiency; and compared with a single large screen display, this device realizes a more abundant spatial bandwidth product, greatly reducing energy consumption and manufacturing costs. Moreover, through the cooperation of the auxiliary control unit and the application module of the software layer, this application can feedback instruction signals, etc. to the control layer module and the display unit without modifying the program structure in the core components or re-customizing the firmware, so as to realize the adaptation to the user-defined target scene and the control of the display function. And the serial port module is used to connect peripheral components of corresponding interface types, thereby broadening the IO peripheral resources of the multi-display seamless splicing display device, enabling it to carry more input type peripherals including but not limited to keyboards, mice, and sensors, greatly expanding the usage scenarios. At the same time, the light field seamless splicing display device can be equipped with an integrated graphics programming interface, achieving the adjustment of the application status information of the display unit and the control of the display image scene. The overall function is comprehensive enough and the programming threshold is low. In addition, the device adopts a modular design, with simple component replacement, short software and hardware iteration cycles, and low iteration costs. Since the display unit uses a small-size display screen and a point light source as the backlight module, as well as mature supporting equipment, it is expected to break through the two-dimensional architecture of the current display technology and expand the structure of the traditional display device from two-dimensional to three-dimensional. Even if a low-performance display panel is used, a high-performance and excellent comprehensive index planar and / or three-dimensional display system can be constructed through the technical means of the light field seamless splicing display device and the light field display system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of a light field seamless splicing display device of the present application;

[0042] Figure 2 It is a schematic structural integration diagram of a light field display system design of the present application;

[0043] Figure 3 It is a schematic diagram of the physical structure and principle of the light correction unit of the present application;

[0044] Figure 4 It is a schematic diagram of the physical structure and principle of the beam shaping unit of the present application;

[0045] Figure 5 It is a functional implementation flowchart of 2D plane and 3D light field image display in an embodiment of the present application. Detailed implementation manners

[0046] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0047] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0048] It should also be understood that the terms used in this specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this specification of the present application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0049] It should be further understood that the term "and / or" used in this specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] As used in this specification and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" depending on the context.

[0051] In order to illustrate the technical solutions adopted by the present application, the present application will be further described in detail below through specific implementation manners in combination with the accompanying drawings.

[0052] Embodiment 1:

[0053] This example discloses a light field seamless splicing display device. For better understanding, this design can also be understood as a device that uses multiple display screens as local display units for global image display. Please refer to Figure 1 , and this multi-display screen structure includes a power supply unit, a backlight unit, a display unit, and an auxiliary control unit. Each unit module will be described separately below.

[0054] First, in order for each unit module to work smoothly, a power supply unit should be provided. In this application, the power supply unit includes a voltage stabilizing module 11, so it can be used to provide stable electrical energy to the backlight unit, the display unit, and the auxiliary control unit. The stable electrical energy includes at least 5V, 12V, or electrical energy of a preset level. As Figure 1 shown, thus, due to the use of the voltage stabilizing module 11, the power supply unit can output at least 5V, 12V, or other preset levels of electrical energy. Among them, the specific value of other preset levels of electrical energy can be determined according to the actual needs of users. For example, 10V, 24V, 48V, or 60V, etc., which are not limited here.

[0055] In actual applications, since a liquid crystal display screen is adopted, a backlight unit is required. The backlight unit may include a point light source module 12. The point light source module 12 includes multiple LED point light sources. The point light source module 12 is used to provide a non-collimated light source covering the entire screen. The light propagation direction of the collimated light source is guided by three LED point light sources to obtain the initial light propagating in a specific direction. In the light propagation from the point to the screen, beam shaping is achieved through an added external unit to synchronize the irradiance.

[0056] For the global display of images, multiple groups of display units are also required for corresponding display. A single display unit includes an LCD module 13 and a driving module 14. Multiple groups of display units are used to construct a corresponding global display device, that is, a large display structure composed of multiple display screens arranged and combined in the same plane, such as 2*2, 3*3, or 5*5, etc., which are specifically selected according to the embodiments and are not limited here.

[0057] Among them, the light field seamless splicing display device also includes a beam shaping unit composed of an extinction module 17 and a light homogenizing module 18. The beam shaping unit is a pre-set combination required for display. The light homogenizing module 18 of the beam shaping unit is connected to the point light source module 12 through one-to-one correspondence with the display unit to modify the light intensity of the scattered light generated by the point light source at different angles, such as 15°, 30°, or 45°, etc., which are specifically selected according to the embodiments; the extinction module 17 adopts a frustum-shaped cylinder structure and also corresponds to the display unit. The extinction module 17 reflects and absorbs the diffused light caused by the scattering of the point light source through its special wedge-shaped structure. In actual operation, the extinction module 17 adopts a wedge-shaped structure from bottom to top. It should be noted that the extinction operation does not change the main light generated by the point light source module 12, but processes the stray light that needs to be removed, further completing the uniformity of the light on the display plane, and completing the pre-processing of the light through the above-mentioned pre-set combination.

[0058] The multi-display structure further includes a light correction unit that connects multiple display units in parallel. The light correction unit includes a slit elimination module 19 and a collimation module 110. The propagation paths of the light in and on the screen are obtained through the point light source module 12 and the LCD module 13, and are inferred based on the slit width generated by the splicing of the corresponding LCD modules 13 of the display units. The slit elimination module 19 realizes the remapping from the display plane of the corresponding display unit to the seamless state of the collimation module 110 through geometric changes, that is, the slit elimination is completed. The collimation module 110 specifically includes a microlens array corresponding to each display unit with each display unit after slit elimination as a coordinated complete display plane, and collimates the light on the display plane according to the corresponding display unit, solving the possible artifacts at the splicing of the display units to obtain a new imaging plane.

[0059] In the actual application process, the extinction module 17 and the light homogenization module 18 are not only in a combined relationship, but also have a dual constraint relationship. The tilt angle of the structure used by the extinction module 17 will restrict the correction angle of the light by the light homogenization module 18, and the refractive index of the medium used by the light homogenization module will simultaneously become a special factor affecting the design of the wedge-shaped structure of the extinction module.

[0060] Furthermore, the auxiliary control unit is connected to the display unit. The auxiliary control unit includes an activation module 15 and a serial port module 16. The activation module 15 is used to obtain the application status and / or status information of all display units, generate an electrical signal to activate the display units that need to be applied, and idle the unapplied display units. Specifically, the activation module 15 is used to obtain the serial port information sent by the serial port module 16 and generate an instruction signal fed back to the display unit, where the instruction signal can be a voltage and current signal for generating the control drive module 14 and the backlight unit. The serial port module 16 is used to connect multiple groups of display units respectively. Specifically, the serial port module 16 is used to connect peripheral components of the corresponding interface type for parameter adjustment of the point light source module 12 and the drive module 14, so as to input the fed-back electrical signal back to the display unit.

[0061] Preferably, the display unit is connected to the auxiliary control unit, other peripherals, etc. The display unit includes an LCD module 113 and a drive module 114. The drive module 114 is used to obtain and store a planar image or a 3D rendered image of the target scene and input it into the LCD module 113, where the planar image or 3D light field image includes at least RGB information and transparency information. The LCD module 113 is lit by the backlight, and the transmittance of each pixel of the liquid crystal panel is controlled by the voltage of the drive module 114 to realize the display output of the planar image or 3D light field image.

[0062] It should be understood that the display unit and the backlight unit can be directly electrically connected to the auxiliary control unit to facilitate the interaction of communication signals with the auxiliary control unit. As for the signaling timing relationship generated during connection, it is specifically selected according to the actual situation and is not limited herein.

[0063] Therefore, for the light field seamless splicing display device and the light field display system according to the above embodiments, since the light field seamless splicing display device has a backlight unit composed of point light source modules 12, replacing the traditional large-area backlight panel, and can achieve the lighting of the display unit, through the supporting beam shaping unit, that is, the extinction module 17 and the light homogenizing module 18, to achieve the uniformity and effectiveness of light. The light correction unit is used to eliminate the screen gaps generated by splicing on this basis, so as to construct and optimize a complete display plane. Compared with the traditional splicing screen, this device has a higher lossless resolution and a significant improvement in display efficiency; and compared with a single large-screen display, this device realizes a more abundant spatial bandwidth product, greatly reducing energy consumption and manufacturing costs. Moreover, through the activation module 15 and the serial port module 16 included in the auxiliary control unit, this application can feedback instruction signals to the driving module 14 of the display unit, etc., without modifying the program structure in the core components or re-customizing the firmware, so as to achieve the adaptation to the user-defined target scene and the control of the display function. And the serial port module 16 is used to connect peripheral components of corresponding interface types, thereby broadening the IO peripheral resources of the multi-display seamless splicing display device, enabling it to carry more input-type peripherals including but not limited to keyboards, mice, and sensors, greatly expanding the usage scenarios. At the same time, the light field seamless splicing display device is equipped with an integrated graphics programming interface, achieving the purpose of adjusting the application status information of the display unit and controlling the display image scene. The overall function is comprehensive enough and the programming threshold is low. In addition, the device adopts a modular design, with simple replacement of components, short software and hardware iteration cycles, and low iteration costs. Since the display unit uses a small-size display screen and the point light source module 12 as the backlight unit, as well as mature supporting equipment, it is expected to break through the two-dimensional architecture of the current display technology and expand the structure of the traditional display device from two-dimensional to three-dimensional. Even if a low-performance display panel is used, a high-performance and excellent comprehensive index flat and / or three-dimensional display system can be constructed through the technical means of seamless splicing and the display system.

[0064] In this embodiment, refer to the appendix Figure 1, the backlight unit includes a point light source module 12. Among them, the point light source module 12 can be composed of multiple LED lights. Generally, taking the light source as the starting point, for example, using multiple LED lights as the light source starting point. In order to ensure the utilization rate of light while increasing the light density, multiple LED lights can be arranged in a triangular distribution and the light can be guided to the entire bottom surface formed by the display unit through the light extinction module 17, that is, the plane after splicing multiple LCD modules 113. Further understanding, that is, the point light source module 12 can fix each combined part through an external support structure and be installed at the bottom of the seamless splicing display device, so as to ensure that the corresponding LCD module 113 of the display unit can obtain uniform and bright non-collimated backlight.

[0065] In this embodiment, refer to the appendix Figure 1 , specifically, the driving module 14 is used to digitize and store the display information of the planar image or 3D light field image, that is, the RGB information and transparency information, and input it into the LCD module 13. The LCD module 13 is lit by the point light source module 12 and the transmittance of each pixel of the liquid crystal panel is controlled by the voltage of the driving module 14 to realize the three-dimensional display output of the rendered image. It should be understood that there are multiple groups of display units. Further understanding, refer to the appendix Figure 1 , multiple display units belong to a parallel distribution relationship, and multiple display units are jointly spliced into a complete display plane.

[0066] The auxiliary control unit includes an activation module 15 and a serial port module 16. The activation module 15 can be connected to the serial port module 16 to obtain the image display information, convert it into an instruction signal and output it to the driving module 14 of the display unit and the point light source module 12 of the backlight unit for parameter adjustment. It should be understood that for the unactivated signal output by the activation module, the corresponding point light source module 12 and LCD module 13 will go into sleep to avoid affecting the global image display; the serial port module 16 can have multiple serial ports to connect more peripheral components. For example, there are three serial ports, namely serial port one, serial port two, and serial port three. Each serial port is connected to a peripheral device of the USART interface type, and serial communication is carried out based on a custom USART communication protocol. The peripheral devices of the USART interface type mentioned here can include microprocessors, mouse keyboards, various storage devices, and control devices, etc. The corresponding peripheral components are used for parameter adjustment of the point light source module 12 and the driving module 14, and thus the feedback electrical signal is input back to the display unit. Further understanding, these serial ports are all connected to peripheral devices using the USART communication protocol, and can receive and convert serial port signals. For example, receive the image display data from an external microprocessor and transmit it to the driving module 14, and its function is realized through the serial port interrupt module integrated in the microprocessor and the user-defined serial port conversion communication protocol.

[0067] In this embodiment, refer to the appendix Figure 1, specifically, the voltage stabilization module 11 is used to provide the required stable voltage for each module in the light field seamless splicing display device, such as stabilizing at 3.3V and 5V levels. In a specific embodiment, the voltage stabilization module 11 can be a CAT6219 voltage stabilization chip.

[0068] It should be noted that the power supply unit can also be electrically connected to the activation module 15 and the serial port module 16 other than the display unit and the backlight unit, so as to provide stable electrical energy for these modules.

[0069] Embodiment 2:

[0070] Based on the light field seamless splicing display device disclosed in Embodiment 1, the present application also proposes a light field display system, which at least includes a software layer, a peripheral layer, and a control layer. Among them, for the structural integration of the light field display system, please refer to the appendix Figure 2 , for the composition structure of the display system, please refer to the appendix Figure 3 , appendix Figure 4 , and the following will specifically describe each part of the light field display system.

[0071] In this embodiment, referring to Figure 2 , the light field display system includes a software layer L21, a peripheral layer L22, and a control layer L23. The software layer L21 includes a multi-screen interaction module 21 and a data transmission module 22. Among them, the multi-screen interaction module 21 will be described below:

[0072] The multi-screen interaction module 21 can provide a window for users to input graphical interfaces or instructions. The multi-screen interaction module 21 can simultaneously control multiple display screens through protocols such as networks and serial ports, with a better integrated display screen effect, and can also perform operations such as marking on the graph to expand the application scenario.

[0073] The working process of the data transmission module 22 will not be elaborated here.

[0074] It should be noted that Figure 2 the software layer L21 in

[0075] Among them, the peripheral layer L22 includes a backlight unit 23 and a display unit 26. Among them, the backlight unit 23 includes a point light source module. The point light source module includes multiple LED lights as light sources. The point light source module is used to provide a non-collimated light source covering the entire screen. By guiding the light propagation direction of the non-collimated light source, light propagating in a specific direction is obtained. In the light propagation from the point to the screen, other structures and modules are added to achieve light correction, so as to synchronize the brightness of the full-view image. The display unit includes a driving module and an LCD module. The driving module is used to store the target plane image and / or 3D light field image and input it into the LCD module. The LCD module is lit by the backlight unit 23 and controlled by the driving module to output an image.

[0076] Meanwhile, the peripheral layer further includes a serial port module 29. The serial port module 29 is used to connect multiple groups of display units and other peripherals respectively. Specifically, during the parameter intersection process, the control layer module obtains the serial port information sent by the serial port module 29 and generates an instruction signal fed back to the display unit. Among them, the instruction signal can be a voltage and current signal for controlling the driving module and the backlight unit. The serial port module 29 is used to connect peripheral components of the corresponding interface type for parameter adjustment of the point light source module and the driving module, and thus the electrical signal as feedback is input back to the display unit. It should be understood that this process is basically the same as the parameter intersection process of the auxiliary control unit in the example Figure 1 and will not be elaborated here.

[0077] Moreover, the peripheral layer further includes a light homogenizing module 24 and a light extinction module 25 integrated in the extinction unit. Among them, the working principles of the light homogenizing module 31 and the light extinction module 32 will be described below in combination with Figure 3 and the specific principles are as follows:

[0078] The physical structures and relative relationships of the light extinction module 31 and the light homogenizing module 32 are as shown in Figure 3 (a). The light of the point light source propagates through the light homogenizing module 32 composed of lenses to complete the first light processing. The scattered light enters the light extinction module 31, where the absorption and elimination of stray light are completed. Combining Figure 3 (b), make a cross-section of the light extinction module 31. First, it should be stated that the actual light propagation is calculated using solid angles. Here, for the sake of principle explanation, plane angles are used for calculation: Without specific selection, a ray starting from a point light source forms an angle θ with the horizontal plane. The light extinction module 31 takes the folded angle of the wedge-shaped basic structure. The upper end of the folded angle forms an angle α with the horizontal plane. On this basis, the folded angle is β. It is assumed that the selected ray is reflected between two folded angles. To eliminate the light entering the folded angle, all angles in the figure should satisfy the following equations and inequalities:

[0079]

[0080] γ = π - β - θ - β + α (2)

[0081]

[0082] To make it hold true all the time, the solution is:

[0083] α - 2β ≥ θ (4)

[0084] α and β are the inherent properties of the extinction module 31. Just by satisfying equation (4), the design parameters of the extinction module can be determined, and the absorption and elimination of stray light can be completed.

[0085] Combined with Figure 3 (c) and Figure 3 (d), analyze the light homogenization module 32. As Figure 3 (c) shows, when there is no light homogenization module 32, the isophote surface 34 of the point light source is a spherical surface. Analyze the spherical surface and the corresponding circular cutting surface at this time, and the illuminance satisfies the following formulas respectively:

[0086]

[0087] The light homogenization module 36 needs to use a lens at the display screen, that is, at the corresponding cutting surface, to create Figure 3 (d) the isophote surface 35 shown in. As Figure 3 (d) shows, the corresponding lens curve f(x, y) = 0 and other related variables should satisfy the following coupled equations composed of a first-order ordinary differential equation and an algebraic equation:

[0088]

[0089]

[0090] ψ - b - c = 0 (11)

[0091]

[0092] In the formula, h, n, and C are constants. h and n have their respective physical meanings. h represents the vertical distance from the point light source to the display screen, n represents the refractive index of the medium used for the lens, and C should be any positive constant less than the corresponding spherical surface E s and is related to h. To obtain the lens curve f(x, y) = 0, solve the above equations. Based on the numerical solution method, the corresponding lens curve can be obtained, and thus the modeling of the light homogenization module 36 is completed.

[0093] At the same time, the peripheral layer also includes a light ray correction unit integrating the slit elimination module 27 and the collimation module 28. Among them, the working principles of the slit elimination module 27 and the collimation module 28 will be described below in combination with Figure 4 The specific principles are as follows:

[0094] It should be noted that in combination with Figure 4The principle description will ignore the light homogenization module and the light extinction module, which will not have any impact on the principle. Only considering the cross-section, given that the parameter D is the full length of the display screen 43 and d is the full length of the LCD module, it can be known that the width of the black edge gap 44 is D - d. Solve for the distance H from the corresponding point light source 41 to the display screen 43 and the distance h from the display screen 43 to the microlens array 45. Since the boundary rays converge at the incident surface of the microlens array 45, the diffuse reflection generated by the black edge gap 44 is masked by the backlight rays of the point light source, which plays a role in eliminating the black edge gap 44. To solve for H and h, consider the boundary ray 42, and it is easy to find the following relationship:

[0095]

[0096] At this time, further consider the limiting conditions of the light homogenization module and the light extinction module on H and h, and the device selects the sizes of H and h according to needs. The collimation module 28 consists of the microlens array 45. It should be clear that since the incident angle range of the rays to be collimated is relatively large, a uniform microlens array cannot meet the requirements. Therefore, the collimation module uses a microlens array that satisfies one or more of the Gaussian distribution / normal distribution, etc. for collimation. Specifically for the light field image used in 3D display, the basic minimum unit of the microlens array 45 corresponds one-to-one to the minimum meta-image of the light field image. Based on the principle of integral imaging, it is re-imaged above the exit surface of the microlens array 45 to achieve a stereoscopic display effect.

[0097] Furthermore, the peripheral layer L22 is integrated on the light field seamless splicing display device, and the sensing module 219 includes any combination of an optical sensor, a current sensor, and a voltage sensor.

[0098] It should be noted that the peripheral layer L21 includes basic functional devices such as a processor, a voltage regulator, and a driver and external devices (not shown in the figure), which are usually used for digital processing of input signals and output control of multiple 2k or any resolution display screens. The multiple display units 26 including the liquid crystal panel and the driver are the basic components of the multi-display screen system, ensuring that the display system has the ability to display and switch images. Conventional 2k display screens available on the market can be used, or even customized display screens can be used. There is no restriction here, and the basic display structure of this light field seamless splicing display device will not be elaborated here.

[0099] The control layer L23 includes a logic control module 210 and an event processing module 211. The logic control module 210 is used to obtain the application status and / or status information of all display units, generate an electrical signal to activate the display units that need to be applied, and idle the unapplied display units. The event processing module 211 is connected to the serial port module 29 to control events such as interrupt processing and task scheduling of multiple groups of display units and other peripherals.

[0100] Specifically, during the parameter intersection process, the logic control module 210 is used to obtain the serial port information sent by the serial port module 29 and generate an instruction signal feedback to the display unit, where the instruction signal can be a voltage and current signal for controlling the driving module and the backlight unit; the event processing module 211 is connected to the serial port module 29 to control the peripheral components of the corresponding interface type for parameter adjustment of the point light source module and the driving module, so as to input the feedback electrical signal back to the display unit. It should be understood that this process is basically the same as the parameter intersection process of the auxiliary control unit in the example Figure 1 and will not be elaborated here.

[0101] In this embodiment, the above disclosed light field display system can be used to display the target plane image and the 3D light field image. The display processes of the target plane image and the 3D light field image will be specifically described below, as Figure 5 shown, which includes the following control steps.

[0102] Step 51, start to execute the task.

[0103] Step 52, the point light source module works, emits initial light rays and propagates them to the light homogenizing module.

[0104] Step 53, the light rays enter the light homogenizing module, complete the irradiance homogenization of the corresponding light rays through the lens and propagate towards the extinction module.

[0105] Step 54, the light rays enter the extinction module, eliminate unnecessary stray light through the wedge-shaped extinction walls around the light source, and retain the effective light rays. Thus, the pre-adjustment of the light rays is completed.

[0106] Step 55, the display data of the target image is transmitted into the driving module through the data transmission module.

[0107] Step 56, decode the display image information through the driving module, initialize / update the states of each driving LCD, that is, modify parameters such as the light transmittance, color filtering, and activation signal.

[0108] Step 57, the activation module (i.e., the integration of the logic control module and the event processing module) is used to judge the activation signals corresponding to each display unit input.

[0109] Step 58, if the LCD module determines that it needs to be activated, it will be turned on; otherwise, the display unit will be set idle. After activation, the LCD module updates its own state according to the initialization data of the driving module.

[0110] Step 59, receive the light rays passing through the open-state LCD module, and initially eliminate the splicing gap by adjusting the distance between the screen and the microlens array.

[0111] Step 510, the light rays emitted from each display screen after being processed by the slit elimination unit are remapped to form a new display plane, and the effective light rays of the display plane are collimated through the microlens array.

[0112] Step 511, the corresponding image display is completed after the above operations.

[0113] Step 512, the user uses a peripheral device to interact with the image through the serial port module. The system judges the interaction signal. If it is determined that the original image is to be operated, only the LCD state is updated according to the refresh rate; if it is determined that the displayed image needs to be updated, then return to Step 55 for the next round of image information processing.

[0114] It can be understood that the corresponding control instructions are received by multiple display screens, and then the processing and transformation means of the light vector information in the multiple display screens are adopted to realize the display and human-computer interaction of the target image.

[0115] Therefore, for the light field seamless splicing display device and the light field display system, since the point light source replaces the traditional large-area backlight board, and the light beam shaping unit is used to achieve the uniformity and effectiveness of the light rays while being able to light up the display unit, and the light ray correction unit eliminates the screen gaps generated by splicing on this basis, thereby constructing and optimizing a complete display plane. Compared with the traditional splicing screen, the design of this display system enables the device to have a higher lossless resolution and a significant improvement in display efficiency; and compared with a single large-screen display, this design realizes a more abundant spatial bandwidth product, greatly reducing the energy consumption and manufacturing cost. Since the display unit uses a small-size display screen and the point light source replaces the traditional backlight, as well as mature supporting equipment, it is expected to break through the two-dimensional architecture of the current display technology and expand the structure of the traditional display device from two dimensions to three dimensions. Even if a low-performance display panel is used, a high-performance and excellent comprehensive index plane and / or three-dimensional display system can be constructed through the technical means of seamless splicing and the display system.

[0116] The above content is a further detailed description of the present application in combination with specific implementation manners, and it cannot be determined that the specific implementation of the present application is only limited to these descriptions. For those of ordinary skill in the technical field to which the present application belongs, without departing from the inventive concept of the present application, several simple deductions or substitutions can still be made.

Claims

1. A seamless splicing display device for light field, characterized in that Including: A backlight unit for generating the illumination backlight required for display; A plurality of display units that are spliced to form a display plane. Each of the display units includes a driving module and an LCD module. The driving module is used to acquire and store 2D planar images and / or 3D rendered images and transmit them to the LCD module. The LCD module is illuminated by the illumination backlight and outputs the corresponding 2D planar image or 3D rendered image; An auxiliary control unit that is signal-connected to the display unit. The auxiliary control unit includes an activation module and a serial port module. The activation module is used to collect the serial data sent by the serial port module and generate an activation instruction signal that is fed back to the display unit. The serial port module is used to connect to peripheral components of corresponding interface types for parameter adjustment of the display module.

2. The light field seamless splicing display device according to claim 1, wherein It further includes a beam shaping unit composed of a light extinction module and a light homogenizing module; The beam shaping unit is configured as a front combination required for display, and is used to modulate the illumination backlight required for each of the display units respectively. The light homogenizing module is arranged at the front end of the point light source module and is used to modify the light intensity of the scattered light generated by the point light source module at different angles; the light extinction module adopts a plurality of frustum-shaped cylindrical structures with a built-in wedge structure, and is used to reflect and absorb the diffused light caused by the scattering of the point light source module, and does not change the main light of the point light source module during the light extinction operation, and only processes the stray light that needs to be removed.

3. The light field seamless splicing display device according to claim 2, wherein It further includes a light ray correction unit composed of a light slit elimination module and a collimation module; The light ray correction unit is used to obtain the light propagation path of the illumination backlight through the point light source module and the LCD module and infer according to the gap width generated by the splicing of the display units. The light slit elimination module is used to achieve the remapping of the display plane of each of the display units to the seamless state of the collimation module through geometric structure changes, so as to achieve light slit elimination; after light slit elimination, each of the display units is used as a coordinated complete display plane, and a new imaging plane is obtained by eliminating the artifacts generated at the splicing positions of each of the display units.

4. The light field seamless splicing display device according to claim 2, wherein, It further includes a power supply unit, and the backlight unit includes a point light source module; The power supply unit includes a voltage stabilization module for providing stable electrical energy to the backlight unit and the display unit, and at least includes electrical energy of 5V, 12V or other preset levels; The point light source module includes point lights composed of multiple LEDs. The point light source module is used to provide the illumination backlight that covers and lights up the entire display plane, and guides the light propagation direction of the illumination backlight through the point lights composed of multiple LEDs to obtain light that is approximately scattered under ideal conditions.

5. The light field seamless splicing display device according to claim 2, wherein The light homogenizing module and the light extinction module are physically in an embedded structure to achieve lossless transmission of light. The lossless transmitted light only includes the main light of the point light source module that is directly mapped to the display unit after divergence through the light extinction structure, and does not include the redundant light reflected by the light homogenizing module and the stray light that generates diffuse reflection and is removed in the light extinction module.

6. A light field display system, characterized in that, Including a software layer, a peripheral layer, and a control layer; The peripheral layer includes a backlight unit and a plurality of display units; The software layer includes a multi-screen interaction module and a data transmission module; the multi-screen interaction module is used to provide a window for the user to input a graphical interface or instructions, and to execute the collaborative work of multiple display units in the light field seamless splicing display device; The data transmission module is used to receive and transmit the target pictures to be displayed, and the target pictures include 2D plane images and / or 3D rendered images; the data transmission unit and the multi-screen interaction module use the same end-to-end communication framework from the server to the client to transmit the target pictures and deploy the target pictures on the display units; The control layer includes a logic control module and an event processing module; the logic control module is used to obtain the application status and / or status information of each display unit from the multi-screen interaction module, generate an electrical signal to activate the display units that need to be applied, and idle the unapplied display units; the event processing module is used to control the events of interrupt processing and task scheduling between each display unit and other peripherals.

7. The light field display system according to claim 6, wherein In the peripheral layer, a pre-combined light homogenization module and a light extinction module are configured for each display unit; The light homogenization module includes a plurality of lenses, each corresponding to one of the display units respectively. The light homogenization module can modify the light intensity of the scattered light generated by the point light source module at different angles, and make the light uniform on the display plane by only changing the light intensity without changing the direction of light divergence; the light homogenization module has a mathematical model and is expressed as: Among them, E s represents the isophote surface under an ideal point light source, r represents the radius of the concentric sphere, that is, the distance from a point on the surface to the point light source, h represents the distance from a point on the concentric sphere section to the point light source, and θ represents the angle between the line connecting any point on the section and the center of the sphere and the central axis; The light extinction module includes a plurality of frustum-of-a-square-pyramid-shaped cylinders with a built-in wedge structure, each corresponding to one of the display units respectively. The light extinction module is used to reflect and absorb the diffused light caused by the scattering of the point light source module through the wedge structure, and does not change the main light of the point light source module during the light extinction operation, and only processes the stray light that needs to be removed.

8. The light field display system according to claim 6, wherein The peripheral layer further includes an independent seam elimination module and a collimation module integrated in the display unit, and the two are used as a post-combination required for display; The seam elimination module connects adjacent display units and arranges them geometrically to achieve seamless display. By measuring the horizontal and vertical directions of the gaps between adjacent display units, basic data is obtained, and the distance from the backlight unit to the display unit is controlled to adjust the tilt angle of the light extinction module to achieve the directional propagation of the light generated by the point light source module, and the light at the junction of adjacent display units is used to eliminate the gaps; The collimation module includes a microlens array required for stereoscopic display, and each microlens array corresponds to a single display unit. The light on the display plane is collimated according to the corresponding display unit, and can solve the artifacts that may occur at the splicing of the display units to obtain a new imaging plane.

9. The light field display system according to claim 7, characterized in that, The peripheral layer further includes a power supply unit and a serial port module, and the backlight unit includes a point light source module; The point light source module is connected to the power supply unit to obtain the required electric energy. The point light source module includes a point light source composed of multiple LEDs. The point light source module is used to provide illumination backlight that covers and lights up the entire display plane, and guides the light propagation direction of the illumination backlight through the point light source composed of the multiple LEDs to obtain light that is approximately scattered under ideal conditions; The serial port module is used to connect input peripheral devices and acquire and input to the control layer one or more of the instruction information of the software layer and the application information of the display unit.

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