A high uniformity seamless splicing system and brightness adjustment method for light field display

Abstract

The application discloses a high-uniform seamless splicing system and a brightness adjusting method for light field display, and belongs to the technical field of light field display. The system uses a minimum display unit modular splicing architecture to realize super-high resolution display, adopts a composite microlens array to realize axial displacement of an imaging surface, covers a gap between adjacent display units through optical expansion of a pixel matrix, and eliminates parallax faults caused by physical splicing seams. The system integrates a distributed dynamic uniform light module, collects brightness data of a display area in real time, performs brightness compensation on a low-illumination area through array light source driving control, changes a light transmittance, and regulates and controls pixel-level brightness uniformity of the system. The scheme effectively solves the problems of pixel continuity loss and adjacent dimming area light coupling in high-resolution light field reconstruction. The system is widely applicable to light field three-dimensional display, and is a scheme for improving three-dimensional display effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light field display, in particular to a high-uniform seamless splicing system for light field display and a brightness adjustment method. BACKGROUND

[0002] In the physical world, human visual perception is three-dimensional, but the image provided by traditional display technology has only two dimensions, which cannot fully mobilize the stereoscopic vision characteristics of the human eye. Stereoscopic display technology can provide depth information such as object distance and spatial position, restore a more realistic scene, and thus provide a better visual experience. Among them, light field display technology has become the focus of the next generation of stereoscopic display technology due to its advantages of wide display depth, continuous view point, and good stereoscopic effect.

[0003] Light field display reproduces light from the perspective of full light function, reconstructs the complete distribution of light rays emitted by an object in space, and achieves naked-eye three-dimensional visual effect without auxiliary equipment. The core of this technology is to accurately control the direction and intensity of light to reconstruct real three-dimensional light field information.

[0004] Due to the need to record both spatial and angular information, the pixel density requirement of light field display is much higher than that of traditional two-dimensional display. Traditional display screens are limited by the physical pixel density of a single screen, and it is difficult to meet the high pixel number requirement of light field display. Usually, a multi-screen splicing method is used to achieve high resolution, but the black frame between adjacent display units during splicing will cause the continuity of the pixels to be interrupted, forming a visual fault, which seriously affects the parallax continuity of light field reconstruction. At the same time, light field display has very strict requirements on the uniformity of light intensity distribution. The brightness difference caused by splicing, especially the brightness gradient mutation caused by light coupling effect between adjacent regions, will destroy the phase consistency of the reconstructed light beam, affecting the stereoscopic visual effect of light field display.

[0005] In view of the current problems in the field of high-resolution light field display, there is an urgent need for a seamless splicing system that can achieve high brightness uniformity to meet the stringent requirements of light field display on visual quality and system performance. SUMMARY

[0006] In view of the current problems in the field of high-resolution light field display, the present application provides a high-uniform seamless splicing system for light field display and a brightness adjustment method, which aims to achieve ultra-high resolution while ensuring the continuity of display pixels and brightness uniformity through a modular splicing architecture, and to provide a light field display effect with higher picture quality and better stereoscopic effect.

[0007] According to a first aspect of the present application, the present application provides a high uniformity seamless splicing system for light field display, comprising: a light emitting unit for generating a plurality of index controllable incident light rays, wherein the plurality of indexes include brightness, power consumption and / or divergence angle; a light adjusting unit for adjusting the incident light rays to obtain a rectangular light field with high brightness uniformity; a display splicing unit for optically expanding the rectangular light field to obtain a display plane with continuous parallax, the display plane being used to display media content, the media content being a light field display signal input by a display screen in the display splicing unit.

[0008] Further, the light emitting unit comprises an array light source and a driving module; the array light source is used to obtain N light rays by closely arranging light emitting sources, wherein N≥10 7 ; the driving module is used to realize matching control of output current and voltage, so as to ensure that the array light source has stable brightness.

[0009] Preferably, the driving module is a constant current driving, and provides overcurrent protection, short circuit protection, overheat protection and error detection functions.

[0010] Further, the light adjusting unit comprises an extinction module and a dynamic uniformity module; the extinction module is used to generate a light field area with a preset size, the preset size being a conventional display screen area size, and to eliminate stray light by a multi-stage wedge structure to reduce crosstalk, wherein the preset size=A≥6.1 inches; the dynamic uniformity module is used to collect brightness data in real time, so as to adjust the brightness uniformity of the light field area.

[0011] Further, the dynamic uniformity module comprises a brightness sensing circuit, a voltage conversion circuit, a microcontroller, a reset circuit and a brightness adjusting module; the brightness sensing circuit collects brightness data in real time and returns the brightness data to the controller; the voltage conversion circuit provides stable voltage for each circuit module; the microcontroller is used to receive the brightness data and generate a light adjusting control signal; the reset circuit realizes the reset of the dynamic uniformity module; the brightness adjusting module is used to receive the light adjusting control signal, and realizes high brightness uniformity by changing the light source intensity and the light transmittance.

[0012] Further, the brightness adjusting module comprises a light source driving circuit and a light transmittance adjusting circuit; the light adjusting control signal comprises a light source adjusting sub-signal and a light transmittance adjusting sub-signal; the light source driving circuit controls the driving module of the light emitting unit according to the light source adjusting sub-signal to perform brightness compensation on a low-illumination area; the light transmittance adjusting circuit changes the light intensity of the light field area according to the light transmittance adjusting sub-signal to realize pixel-level brightness uniformity adjustment.

[0013] Further, the display splicing unit comprises a condenser lens, a display screen and a Fresnel lens; the condenser lens is arranged at the front end of the light emitting unit and is used for focusing light rays of each pixel in the rectangular light field and adjusting a divergence angle to realize axial displacement of an imaging plane; the display screen is arranged at the front end of the condenser lens and has high resolution and a narrow physical frame, and physical seams are eliminated through optical expansion of a pixel matrix; and the Fresnel lens is arranged at the front end of the display screen through a preset distance and is used for deflecting light rays into parallel light to form a uniform collimated backlight.

[0014]

[0015] wherein x is the distance from the light emitting unit to the display screen, A all is the display area after optical expansion, a all is the display area length after optical expansion, b all is the display area width after optical expansion, A active is the effective display area of the display screen, a active is the effective display area length of the display screen, b active is the effective display area width of the display screen.

[0016] According to a second aspect of the present application, the present application provides a light field display brightness adjustment method applied to the high-uniformity seamless splicing system, comprising:

[0017] obtaining brightness data generated by the light emitting unit or brightness data generated by the display plane; processing the brightness data to calculate brightness uniformity; when the brightness uniformity is less than a minimum set threshold, performing brightness compensation on a low-illumination area; when the brightness uniformity is greater than the minimum set threshold and less than a set target value, performing pixel-level brightness uniformity regulation by changing the light transmittance; when the brightness uniformity reaches the set target value, reducing the control frequency of brightness refreshing; and through repeating all the above steps, real-time regulation of brightness uniformity of the high-uniformity seamless splicing system can be realized.

[0018] Further, the calculation method of the brightness uniformity is as follows: assuming that the high-uniformity seamless splicing system is spliced by n units, the brightness matrixes L1, L2, L3……Ln of each area are obtained through the brightness sensing circuit. n (wherein L m [i,j]=l i,j,m represents the brightness value of the mth unit i row j column pixel, and the resolution of a single imaging area is i x j), and the brightness uniformity is represented as follows:

[0019]

[0020] wherein min(L m[i,j]) is the minimum brightness value, max(L m [i,j]) is the maximum brightness value.

[0021] Furthermore, the light source driving circuit performs brightness compensation on the low illumination area, specifically by the following steps: selecting the minimum brightness value min (L m [i,j]) in the m unit, increases the driving current ΔI of the corresponding light source, and repeats the above process until U>U T , where U T Set the threshold value for the minimum.

[0022] Furthermore, the transmittance adjustment circuit changes the transmittance to adjust the pixel-level brightness uniformity of the high uniform seamless splicing system. The specific steps are: setting the dimming target value to the minimum brightness value l s =min(L m [i, j]), the brightness transmittance of any pixel point on the display plane is expressed as follows:

[0023]

[0024] The light intensity is regulated at the pixel level by the transmittance regulation circuit, and the cycle is refreshed until U>U S , where U S To set the target value.

[0025] The beneficial effects are:

[0026] This application provides a highly uniform seamless splicing system and brightness adjustment method for light field display. Through the modular splicing architecture of the minimum display unit, it effectively breaks through the pixel density limitations of traditional display screens and achieves ultra-high-resolution display purposes. Array lenses are used to achieve axial displacement of the imaging surface, and the gaps between adjacent display units are covered by the optical expansion of the pixel matrix, eliminating the parallax faults caused by physical seams. At the same time, light source area dimming and pixel-level transmittance dimming are used to improve the brightness uniformity of the system, eliminate dark spots and light coupling phenomena, and present a more realistic and immersive light field display effect. It is a solution that meets the visual quality and system performance requirements of light field display. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a highly uniform seamless splicing system for light field display in one embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the principle of seamless beam control in one embodiment of the present application;

[0029] Figure 3 This is a circuit diagram of a dynamic dimming module in one embodiment of the present application;

[0030] Figure 4 A flowchart of a brightness adjustment method for light field display in an embodiment of the present application is shown in FIG. 1.

[0031] Figure 5 A schematic diagram of the principle of a gray scale expansion algorithm in an embodiment of the present application is shown in FIG. 2. DETAILED DESCRIPTION

[0032] In the description of the present application, it should be understood that the described embodiments are only part of the embodiments of the present application, not all embodiments.

[0033] The present application will be further described in detail below with specific embodiments in conjunction with the accompanying drawings

[0034] The present application discloses a high-uniform seamless splicing system for light field display, which has a structure as shown in FIG. 3. Figure 1 The display system mainly includes a light emitting unit 110, a light adjusting unit 120 and a display splicing unit 130. The following will be described respectively.

[0035] The light emitting unit 110 can be a tightly arranged LED array driven by a multi-channel constant current driving chip, which is used to generate a sufficient number of stable and controllable incident light rays, while meeting the indicators such as brightness, power consumption and divergence angle.

[0036] The light adjusting unit 120 is used to adjust the light generated by the light emitting unit 110 to obtain a rectangular light field with high brightness uniformity. The light adjustment here includes two parts of eliminating system stray light and improving brightness uniformity. The rectangular light field here is the area light field of the splicing unit.

[0037] The display splicing unit 130 is used to expand the rectangular light field generated by the light adjusting unit 120, and the micro-lens array enlarges the display effective area to cover the gap between adjacent display units, eliminating the physical seam to realize continuous parallax of the system. The physical seam here includes the black border of the display screen and the physical gap between the display splicing units.

[0038] In a specific embodiment, the light emitting unit 110 includes an array light source 11 and a driving module 12. The array light source 11 adopts a high-density LED array, and the arrangement pitch is optimized according to the resolution requirement of the light field display to ensure that a sufficient number of light rays are generated; the output current and voltage of the driving module 12 can be dynamically adjusted according to the brightness requirement to ensure that the light emitting unit 110 can provide stable light output under different working conditions. It can be understood that the driving module 12 can be a TLC5927 multi-channel constant current driving chip, which adopts a saturated MOS tube type constant current driving structure, has 16 channels of output, and can drive a LED in multiple channels in parallel according to the required current of the LED. The chip also integrates overcurrent protection, short circuit protection, overheat protection and error detection functions.

[0039] In a specific embodiment, the light modulation unit 120 includes a light elimination module 13 and a dynamic light uniformity module 14. The light elimination module 13 is a prismatic structure, the light emitting unit 110 is placed at the bottom of the prism, the display unit 130 is placed at the top of the prism, and there are multiple wedge-shaped platforms inside the structure for reflecting and eliminating edge stray light, reducing crosstalk, and obtaining a rectangular light field with clear boundaries. The dynamic light uniformity module 14 collects real-time brightness data of the light field area and realizes brightness uniformity regulation through feedback control. The brightness uniformity regulation here is hierarchical regulation, including regional light source dimming and pixel-level transmittance dimming.

[0040] In a specific embodiment, the display splicing unit 130 includes a condenser lens, a display screen, and a Fresnel lens. The condenser lens 15 compresses the divergence angles of light rays in different directions, taking the maximum value in the diagonal direction, and the divergence angles in other directions decrease according to a certain rule, thereby focusing more light rays into the rectangular light field and improving the light efficiency. The adjustment of the divergence angle also realizes the axial displacement of the imaging plane; the display screen can be a 2560*1440 high-resolution and 8-bit true color liquid crystal display screen, and the effective display area of the screen is 5.46 inches. It should be noted that the screen frame of the display screen will greatly interfere with the display effect, and the influence of the upper and lower frames is more significant. In order to eliminate this influence, during the design of the display system, the method of enlarging the effective area to the display plane and then splicing it is adopted to achieve seamless splicing; the Fresnel lens 17 is used to deflect the light into parallel light, forming a uniform collimated backlight, and also serving as the display imaging plane.

[0041] In a specific embodiment, Figure 2 The principle diagram of the display system light beam regulation is given. The array light source in the light emitting unit has a plurality of light emitting sources L1 arranged closely, and each light emitting source L1 has a corresponding light elimination module L2, a dynamic light uniformity module L3, a condenser lens L4, and a display screen L5. Light beam regulation mainly controls the divergence angle of light sources in each direction. The size of the divergence angle is related to the positions of the light source, the display screen plane, and the imaging plane: insufficient diffusion of directional light will still have black edge seams; excessive diffusion of directional light will cause overlapping of the illumination area of the backlight at the original seam, resulting in superposition of brightness and affecting the viewing effect. The seamless splicing scheme of the display system is described in detail below.

[0042] The light emitting source L1 can be a high-density LED array, and the single LED lamp bead has a light emitting area of 3.45mm*3.45mm and a light emitting angle of 125°, generating a spherical light field. The light elimination module L2 can be a prismatic structure made of light-absorbing material with a length of x. The dynamic light uniformity module L3 regulates the light intensity of each pixel in the rectangular light field, realizing system brightness uniformity greater than a set target value U sThe condenser lens L4 compresses the divergence angle σ of light rays in different directions, and the maximum value is 12.2° in the diagonal direction, and the divergence angle in other directions decreases according to a certain rule, and the minimum value is 8.7°. The range A of the working area of the display screen L5 active , the length is a active , and the width is b active . The Fresnel lens L6 is arranged at the axially displaced imaging surface x l , and at this time the area of the sub-display area is A all , the length is a all , and the width is b all .

[0043] Among them, the compression divergence angles in the horizontal direction and the vertical direction are respectively:

[0044]

[0045] The expression of the distance of the axial displacement of the imaging surface is as follows:

[0046]

[0047] In a specific embodiment, Figure 3 The circuit schematic of the dynamic dimming module is given. The structure of the dynamic dimming module will be described in detail below.

[0048] The dynamic uniformity module includes a brightness sensing circuit 31, a voltage conversion circuit 32, a microcontroller 33, a reset circuit 34, and a brightness control module 35. The brightness sensing circuit 31 can be a distributed high-sensitivity photodiode array, or it can collect system brightness data through an industrial camera; the voltage conversion circuit 32 provides stable 3.3V, 5V and 12V voltages for each circuit module; the microcontroller 33 can be a single-chip microcomputer, which is used to receive the brightness data collected by the brightness sensing circuit, generate dimming control signals, and send them to the TLC5927 light source driving chip and the brightness control module 35; the reset circuit 34 shields the control signals of the microcontroller 33 and restores the brightness control module 35 to the initial state; the brightness control module 35 is used to receive the dimming control signals (including light source adjustment sub-signals and light transmittance adjustment sub-signals) of the microcontroller 33, and to achieve high brightness uniformity by changing the light source intensity and light transmittance.

[0049] In a specific embodiment, the brightness control module 35 includes a light source driving circuit 36 and a light transmittance adjustment circuit 37. The light source driving circuit 36 can be a switching circuit, which controls the output current by switching the external resistance of the TLC5927 chip to compensate for the brightness in low-illumination areas; the light transmittance adjustment circuit 37 can be a high-resolution black-and-white TFT dot matrix screen, which changes the intensity of the corresponding light by controlling the gray scale of the pixels to achieve pixel-level brightness uniformity control.

[0050] The application also discloses a light field display brightness adjusting method applied to a light adjusting unit 120 in a high-uniformity seamless splicing system, as shown in the figure. Figure 4 The area light source light adjusting and the pixel-level light transmittance light adjusting are adopted to eliminate dark spots and light coupling phenomena and improve the brightness uniformity of the display system. The following will be described respectively.

[0051] Step S10, the light adjusting unit 120 performs initialization and sets an initial state to complete calibration, specifically, setting the initial state of the light source driving circuit and the light transmittance circuit. The light source driving circuit initial state controls the TLC5927 chip to output half of the maximum current. The light transmittance circuit initial state controls the black and white TFT dot matrix display highest gray scale.

[0052] It should be noted that the gray scale can be different brightness levels from the darkest to the brightest in the image picture, and the gray scale is generally divided into 0-255 levels, wherein 0 represents the darkest and 255 represents the brightest.

[0053] Step S20, the light adjusting unit 120 obtains the brightness data of the light emitting unit 110 from the brightness sensing circuit and returns to the controller, and the acquisition frequency and the data return frequency can be controlled by the microcontroller to reduce the system power consumption.

[0054] Step S30, the brightness data is preprocessed and the current brightness uniformity of the system is calculated

[0055] Supposing that the system is spliced by n units, the brightness matrixes L1, L2, L3, …, Ln of each area are obtained through the brightness sensing circuit. n (wherein, L m [i,j]=l i,j,m represents the brightness value of the m area i row j column pixel, and the resolution of a single imaging area is i x j), and the system brightness uniformity is represented as follows:

[0056]

[0057] Wherein, min(L m [i,j]) is the minimum brightness value of the system, and max(L m [i,j]) is the maximum brightness value of the system.

[0058] Step S40, the light adjusting unit 120 compares the brightness uniformity value U and the set minimum threshold value U T

[0059] Step S41, the light adjusting unit 120 performs operation, when the brightness uniformity value is less than the set minimum threshold value, the light source driving circuit is used to perform brightness compensation on the low-illumination area. The system minimum brightness value min(L mthe light source driving circuit of the m region where the pixel [i,j] is located, reducing the external resistance value of the TLC5927 chip, increasing the driving current ΔI of the corresponding light source, and repeating the above process until U>U T , wherein, U T is the minimum set threshold.

[0060] Step S50, the dimming unit 120 compares the brightness uniformity value U and the set target value U S

[0061] Step S51, the dimming unit 120 performs operations, when the brightness uniformity is greater than the minimum set threshold and less than the set target value, the transmittance adjustment circuit is changed to adjust the transmittance to control the pixel-level brightness uniformity of the system. The dimming target value is the minimum brightness value l s of the system. m The brightness transmittance of any point of the system is represented as follows:

[0062]

[0063] The transmittance matrix is mapped into the display gray scale matrix of the TFT gray scale screen, the light intensity is controlled at the pixel level, and the refresh is repeated until U>U S , wherein, U S is the set target value.

[0064] Step S60, the dimming unit 120 performs operations, when the brightness uniformity reaches the set target value, the control frequency of the brightness refresh is reduced

[0065] Repeat the above steps to realize real-time control of the brightness uniformity of the system.

[0066] In a specific embodiment, Figure 5 The principle diagram of the gray scale expansion algorithm is given. The gray scale expansion algorithm based on the TFT gray scale screen is specifically described as follows.

[0067] The accuracy of brightness uniformity control mainly depends on the gray scale level of the TFT gray scale dot matrix screen, which is limited by the cost and process of the screen. In order to achieve better control effect and further improve the uniformity of the display screen, the system uses the gray scale expansion method. A number of pixels are combined into one pixel, and the gray scale of each pixel is determined by the average value of the'sub' pixel gray scale.

[0068] The specific implementation is that one display unit on the display screen is defined as a set of a plurality of sub-units, the sub-units are independently controllable; when different numbers of the sub-units in the unit are selected, corresponding gray scales are obtained; the display pixel composed of the selection combination of the sub-pixels of different gray scales displays a new gray scale. The gray scale expansion is realized by reducing the resolution. The original screen has n gray scales, the display unit contains i sub-pixels, and the expression of the expanded gray scale N is as follows:

[0069] N=i(n-1)+1 (6)

[0070] In a specific embodiment, the TFT gray scale dot matrix screen has a gray scale number n of 64, the display unit contains 4 sub-pixels, and the expanded gray scale is 253. In the case of not increasing the hardware resources, the precision of the brightness uniformity regulation is improved.

[0071] The above is the further detailed description of the present application in combination with the specific embodiments, and the specific implementation of the present application cannot be limited to the description. For ordinary skilled in the art to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the inventive concept of the present application.

Claims

1. A high uniform seamless tiling system for light field display, characterized in that, The application relates to a display device, which comprises the following parts: a light-emitting unit for generating multiple index stable controllable incident light rays, wherein the multiple indexes include brightness, power consumption and divergence angle; a light adjusting unit for adjusting the incident light rays to obtain a rectangular light field with high brightness uniformity; a display splicing unit for optically expanding the rectangular light field to obtain a display plane with continuous parallax, which is used for displaying media content; the light adjusting unit comprises an extinction module and a dynamic uniform light module: the extinction module is used for generating a light field area with a preset size, and a multi-stage wedge-shaped structure is used for eliminating stray light to reduce crosstalk, wherein the preset size = A >= 6.1 inches; the dynamic uniform light module is used for collecting brightness data in real time and adjusting the brightness uniformity of the light field area; the dynamic uniform light module comprises a brightness sensing circuit, a voltage conversion circuit, a microcontroller, a reset circuit and a brightness adjusting module: the brightness sensing circuit collects brightness data in real time and returns the brightness data to the controller; the voltage conversion circuit provides stable voltage for each circuit module; the microcontroller is used for receiving the brightness data and generating a light adjusting control signal; the reset circuit is used for resetting the dynamic uniform light module; and the brightness adjusting module is used for receiving the light adjusting control signal, changing the light source intensity and the light transmittance to realize high brightness uniformity; the display splicing unit comprises a condenser lens, a display screen and a Fresnel lens: the condenser lens is arranged at the front end of the light-emitting unit and is used for focusing the light rays of each pixel in the rectangular light field and adjusting the divergence angle to realize axial displacement of an imaging surface; the display screen is arranged at the front end of the condenser lens and has high resolution and narrow physical frame, and the physical seams are eliminated through optical expansion of a pixel matrix; and the Fresnel lens is arranged at the front end of the display screen and is arranged at the imaging surface which is axially displaced, and is used for deflecting the light rays into parallel light to form a uniform collimating backlight: The Wherein, x is the distance from the light-emitting unit to the display screen, A all is the display area after optical expansion, a all is the display area length after optical expansion, b all is the display area width after optical expansion, A active is the effective display area of the display screen, a active is the effective display area length of the display screen, b active is the effective display area width of the display screen.

2. A high uniform seamless tiling system for light field display according to claim 1, characterized in that, the light-emitting unit comprises an array light source and a driving module; The array light source is used to obtain N light rays by closely arranging light sources, where N≥10 7 ; the driving module is used for matching control of output current and voltage, and is used for guaranteeing that the array light source has stable brightness.

3. The high uniform seamless tiling system for light field display according to claim 1, wherein, the brightness adjusting module comprises a light source driving circuit and a light transmittance adjusting circuit, and the light adjusting control signal comprises a light source adjusting sub-signal and a light transmittance adjusting sub-signal; the light source driving circuit controls the driving module of the light-emitting unit according to the light source adjusting sub-signal, and performs brightness compensation on a low-illumination area; the light transmittance adjusting circuit changes the light intensity of the light field area according to the light transmittance adjusting sub-signal, and realizes pixel-level brightness uniformity adjustment.

4. A light field display brightness adjustment method applied to the high-uniform seamless splicing system of any one of claims 1-3, wherein the high-uniform seamless splicing system comprises a light-emitting unit, a light adjustment unit, and a display splicing unit, and the method comprises the following steps: adjusting the brightness of the light-emitting unit according to the brightness of the display splicing unit; and adjusting the brightness of the display splicing unit according to the brightness of the light adjustment unit. the brightness adjusting method comprises the following steps: the light adjusting unit performs initialization and sets an initial state to calibrate the brightness of the light rays generated by the light-emitting unit; brightness data generated by the light-emitting unit or brightness data generated by the display plane is acquired; the brightness data is processed to calculate brightness uniformity. The luminance uniformity is judged numerically, when the luminance uniformity is less than a minimum set threshold, the low-illumination area is compensated in luminance; when the luminance uniformity is greater than the minimum set threshold and less than a set target value, the pixel-level luminance uniformity is regulated by changing the light transmittance; when the luminance uniformity reaches the set target value, the control frequency of luminance refreshing is reduced.

5. The method of brightness adjustment of a light field display according to claim 4, wherein, The calculation method of the brightness uniformity is: assuming that the high-uniform seamless splicing system is spliced by n units, brightness matrices L1, L2, L3,..., Ln corresponding to the n units are obtained n Wherein, L m [i,j]=l i,j,m represents the brightness value of the m unit i row j column pixel, the resolution of a single imaging area is i x j, and the brightness uniformity is represented as where min(L m [i,j]) is the lowest luminance value and max(L m [i,j]) is the highest luminance value.

6. The method of brightness adjustment of a light field display according to claim 4, wherein, The low-illumination area is compensated for brightness, and the specific operation is: selecting the m unit where the minimum brightness value min(L m [i,j]) of the high-uniform seamless splicing system is located, improving the driving current of the light-emitting unit until U>U T , wherein U T is the minimum set threshold value.

7. The method of brightness adjustment of a light field display according to claim 4, wherein, Change the light transmittance to regulate the pixel-level brightness uniformity of the high-uniform seamless splicing system. The specific operation is as follows: set the dimming target value as the minimum brightness value l s =min(L m [i,j]), and the brightness transmittance of any pixel point of the display plane is represented as The light intensity is regulated at the pixel level until U>U S where U S is the set target value.

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