High-uniformity seamless splicing system for light field display and brightness adjusting method

Abstract

The invention discloses a high-uniformity seamless splicing system for light field display and a brightness adjusting method, and belongs to the technical field of light field display. According to the system, ultra-high resolution display is achieved through a minimum display unit modular splicing framework, axial displacement of an imaging surface is achieved through a composite micro lens array, gaps between adjacent display units are covered through optical expansion of a pixel matrix, and parallax faults caused by physical splicing seams are eliminated. The system is integrated with a distributed dynamic light equalizing module, brightness data of a display area are collected in real time, brightness compensation is performed on a low-illumination area through array light source driving control, and pixel-level brightness uniformity regulation and control are performed on the system by changing light transmittance. According to the scheme, the problems of pixel continuity deficiency and optical coupling of adjacent dimming areas in high-resolution light field reconstruction are effectively solved. The system is widely applied to light field three-dimensional display and is a scheme for improving the three-dimensional display effect.

Description

Technical Field

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

[0002] In the physical world, human visual perception is three-dimensional, but the images provided by traditional display technology are only two-dimensional, which cannot fully mobilize the stereoscopic visual characteristics of the human eye. Stereoscopic display technology can provide depth information such as the distance and spatial position of objects, and the restored real scene is more realistic, thus giving people 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 such as wide display depth, continuous viewpoints, and good stereoscopic effect.

[0003] Light field display reproduces light from the perspective of full light function, and achieves naked-eye 3D visual effects without auxiliary equipment by reconstructing the complete distribution of light emitted by an object in space. The core of this technology lies in precisely controlling the direction and intensity of light to reconstruct true 3D light field information.

[0004] Due to the need to record both spatial and angular information at the same time, light field display has much higher pixel density requirements than traditional two-dimensional display. Traditional display screens are limited by the physical pixel density of a single screen and cannot meet the high pixel count requirements of light field display. High resolution is usually achieved by splicing multiple screens, but the black borders between adjacent display units during splicing will cause pixel continuity 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 extremely strict requirements on the uniformity of light intensity distribution. The brightness differences in the display sub-areas caused by splicing, especially the sudden changes in brightness gradient caused by the optical coupling effect between adjacent areas, will lead to the destruction of the phase consistency of the reconstructed light beam, affecting the stereoscopic visual effect of the 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 of the invention

[0006] In response to the current problems in the field of high-resolution light field display, the present application provides a high-uniform seamless splicing system and brightness adjustment method for light field display. The purpose is to achieve ultra-high resolution through a modular splicing architecture while ensuring the pixel continuity and brightness uniformity of the display, providing a light field display effect with higher picture quality and better three-dimensional sense.

[0007] According to the first aspect of the present application, the present application provides a highly uniform seamless splicing system for light field display, comprising: a light-emitting unit, used to generate incident light with multiple adjustable indicators, wherein the multiple indicators include brightness, power consumption and / or divergence angle; a dimming unit, used to adjust the incident light to obtain a rectangular light field with high brightness uniformity; a display splicing unit, used to optically expand the rectangular light field to obtain a display plane with continuous parallax, the display plane being used to display media content, and the media content is a light field display signal input through a display screen in the display splicing unit.

[0008] Furthermore, 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 the light sources, wherein N≥10 7 The driving module is used to achieve matching control of output current and voltage to ensure that the array light source has stable brightness.

[0009] Preferably, the driving module is a constant current driver and provides over-current protection, short-circuit protection, over-heat protection and error detection functions.

[0010] Furthermore, the dimming unit includes an extinction module and a dynamic light averaging module; the extinction module is used to generate a light field area of ​​a preset size, the preset size is the size of a conventional display screen, and a multi-level wedge structure is used to eliminate stray light and reduce crosstalk, wherein the preset size = A ≥ 6.1 inches; the dynamic light averaging module collects brightness data in real time to adjust the brightness uniformity of the light field area.

[0011] Furthermore, the dynamic light averaging module includes a brightness sensing circuit, a voltage conversion circuit, a microcontroller, a reset circuit and a brightness control module; the brightness sensing circuit collects brightness data in real time and transmits it back to the controller; the voltage conversion circuit provides a stable voltage for each circuit module; the microcontroller is used to receive the brightness data and generate a dimming control signal; the reset circuit realizes the resetting of the dynamic light averaging module; the brightness control module is used to receive the dimming control signal and achieve high brightness uniformity by changing the light source intensity and transmittance.

[0012] Furthermore, the brightness control module includes a light source driving circuit and a transmittance adjustment circuit; the dimming control signal includes a light source adjustment sub-signal and a transmittance adjustment sub-signal; the light source driving circuit controls the driving module of the light-emitting unit according to the light source adjustment sub-signal to perform brightness compensation for the low illumination area; the transmittance adjustment circuit changes the light intensity of the light field area according to the transmittance adjustment sub-signal to achieve pixel-level brightness uniformity control.

[0013] Furthermore, the display splicing unit includes a condensing lens, a display screen and a Fresnel lens; the condensing lens is arranged at the front end of the light-emitting unit, and is used to focus the light of each pixel in the rectangular light field, and adjust the divergence angle to achieve axial displacement of the imaging surface; the display screen is arranged at the front end of the condensing lens, has a high resolution and a narrow physical frame, and eliminates physical seams through optical expansion of the pixel matrix; the Fresnel lens is arranged at the front end of the display screen at a preset distance, and is used to deflect the light 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 length of the display area after optical expansion, b all is the width of the display area after optical expansion, A active is the effective display area of ​​the display, a active b is the effective display area length of the display, active It is the effective display area width of the display.

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

[0017] Acquire the brightness data generated by the light-emitting unit or the brightness data generated by the display plane; process the brightness data to calculate the brightness uniformity; make a numerical judgment on the brightness uniformity, and when the brightness uniformity is less than the minimum set threshold, perform brightness compensation on the low-illuminance area; when the brightness uniformity is greater than the minimum set threshold and less than the set target value, adjust the pixel-level brightness uniformity by changing the transmittance; when the brightness uniformity reaches the set target value, reduce the control frequency of brightness refresh; and by repeating all the above steps, real-time regulation of the brightness uniformity of the high-uniform seamless splicing system can be achieved.

[0018] Furthermore, the brightness uniformity calculation method is as follows: assuming that the high uniformity seamless splicing system is composed of n units, the brightness matrix L1, L2, L3, ... L of each area is obtained through the brightness sensing circuit. n (Among them, L m [i,j]=l i,j,m represents the pixel brightness value of the i-th row and the j-th column of the m-th unit, and the resolution of a single imaging area is i×j). The brightness uniformity is expressed as follows:

[0019]

[0020] Among them, 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 for the low illumination area, and the specific steps are: 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 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, which effectively breaks through the pixel density limitations of traditional display screens through the modular splicing architecture of the minimum display unit and achieves the purpose of ultra-high resolution display. The array lens is 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 to eliminate the parallax fault caused by the 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 an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the principle of seamless light 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 schematic diagram of a process flow of a brightness adjustment method for light field display in an embodiment of the present application;

[0031] Figure 5 The figure is a schematic diagram of the principle of a grayscale expansion algorithm in one embodiment of the present application. 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 the embodiments.

[0033] The present application is further described in detail below through specific implementation methods combined with the accompanying drawings

[0034] The present application discloses a highly uniform seamless splicing system for light field display, the structure of which is as follows: Figure 1 As shown, the display system mainly includes a light emitting unit 110, a dimming unit 120 and a display splicing unit 130. They are described below respectively.

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

[0036] The dimming 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 regulation here includes eliminating system stray light and improving brightness uniformity. The rectangular light field here is the regional light field of the splicing unit.

[0037] The display splicing unit 130 is used to expand the rectangular light field generated by the dimming unit 120. The micro-array lens enlarges the display effective area to cover the gap between adjacent display units, eliminating the physical seam to achieve system parallax continuity. 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 spacing is optimized according to the resolution requirements of the light field display to ensure that a sufficient amount of light is generated; the output current and voltage of the driving module 12 can be dynamically adjusted according to the brightness requirements 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 driver chip. The chip adopts a saturated MOS tube constant current drive structure and has 16 channels of output. It can drive an LED in parallel with multiple channels according to the current required by the LED. The chip also integrates overcurrent protection, short circuit protection, overheat protection and error detection functions.

[0039] In a specific embodiment, the dimming unit 120 includes an extinction module 13 and a dynamic light-averaging module 14. The extinction module 13 is a prism-shaped structure, the light-emitting unit 110 is placed at the bottom of the prism, and the display unit 130 is placed at the top of the prism. 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-averaging module 14 collects brightness data of the light field area in real time, and realizes brightness uniformity control through feedback control. The brightness uniformity control here is hierarchical control, including regional light source dimming and pixel-level transmittance dimming.

[0040] In a specific embodiment, the display splicing unit 130 includes a focusing lens, a display screen and a Fresnel lens. The focusing lens 15 compresses the divergence angle of light in different directions, takes the maximum value in the diagonal direction, and reduces the divergence angle in other directions according to a certain rule, so as to focus more light into the rectangular light field and improve the light efficiency. The adjustment of the divergence angle also realizes the axial displacement of the imaging surface; the display screen can be a 2560*1440 high-resolution and 8-bit true color LCD 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, among which the influence of the upper and lower frames is more significant. In order to eliminate this influence, in the design process 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 at the same time serving as a display imaging plane.

[0041] In a specific embodiment, Figure 2 A schematic diagram of the principle of beam control of the display system is given. The array light source in the light-emitting unit has multiple closely arranged light sources L1. The front end of each light source L1 has a corresponding extinction module L2, a dynamic light homogenization module L3, a focusing lens L4, and a display screen L5. Beam control mainly controls the divergence angle of the light source in each direction. The size of the divergence angle is related to the position of the light source, the display screen plane, and the imaging plane: if the directional light is not diffused enough, the black edge seam will still exist; if the directional light is diffused too much, the area illuminated by the backlight source at the original seam will overlap, resulting in the superposition of brightness, which will also affect the viewing effect. The following is a detailed explanation of the seamless splicing solution for the display system.

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

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

[0044]

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

[0046]

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

[0048] The dynamic light-evening 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 the system brightness data can be collected 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 a dimming control signal and send it to the TLC5927 light source driver chip and the brightness control module 35 respectively; the reset circuit 34 realizes the shielding of the control signal 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 signal of the microcontroller 33 (the dimming control signal includes the light source adjustment sub-signal and the transmittance adjustment sub-signal), and achieve high brightness uniformity by changing the light source intensity and transmittance.

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

[0050] The present application also discloses a brightness adjustment method for light field display, which is applied to a dimming unit 120 in a high uniform seamless splicing system. Figure 4 As shown in the figure, regional light source dimming and pixel-level transmittance dimming are used to eliminate dark spots and light coupling phenomena, and improve the brightness uniformity of the display system. The following are explanations respectively.

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

[0052] It should be noted that grayscale can be different brightness levels from the darkest to the brightest in the image. Generally, grayscale is divided into 0-255 levels, where 0 represents the darkest and 255 represents the brightest.

[0053] In step S20, the dimming unit 120 obtains the brightness data of the light-emitting unit 110 from the brightness sensing circuit and transmits it back to the controller. The acquisition frequency and the data transmission frequency can be controlled by the microcontroller to reduce system power consumption.

[0054] Step S30: pre-process the brightness data and calculate the current brightness uniformity of the system.

[0055] Assume that the system is composed of n units, and obtain the brightness matrix L1, L2, L3...L of each area through the brightness sensing circuit n (Among them, L m [i,j]=l i,j,m represents the pixel brightness value of row i and column j in area m, and the resolution of a single imaging area is i×j). The brightness uniformity of the system is expressed as follows:

[0056]

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

[0058] Step S40: the dimming unit 120 compares the brightness uniformity value U with the set minimum threshold value U T

[0059] Step S41, the dimming unit 120 operates, and when the brightness uniformity value is less than the set minimum threshold, the light source driving circuit performs brightness compensation on the low illumination area. m[i,j]) in the light source driving circuit of area m, reduce the external resistance value of the TLC5927 chip, increase the driving current ΔI of the corresponding light source, and repeat the above process until U>U T , where U T Set the threshold value for minimum.

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

[0061] Step S51, the dimming unit 120 performs an operation. When the brightness uniformity is greater than the minimum set threshold and less than the set target value, the transmittance is changed by the transmittance adjustment circuit to adjust the brightness uniformity of the system at the pixel level. The dimming target value is set to the system minimum brightness value l s =min(L m [i,j]), the brightness transmittance of any point in the system is expressed as follows:

[0062]

[0063] Map the transmittance matrix into the grayscale matrix of the TFT grayscale screen, adjust the light intensity at the pixel level, and refresh it cyclically until U>U S , where U S To set the target value.

[0064] Step S60: the dimming unit 120 performs an operation to reduce the control frequency of brightness refresh when the brightness uniformity reaches the set target value.

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

[0066] In a specific embodiment, Figure 5 The principle diagram of the grayscale expansion algorithm is given. The grayscale expansion algorithm based on TFT grayscale screen is described in detail below.

[0067] The accuracy of brightness uniformity control mainly depends on the grayscale level of the TFT grayscale 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 a grayscale expansion method. Combining several pixels into one pixel, the grayscale of each pixel will be determined by the average grayscale of the 'sub' pixels.

[0068] The specific implementation method is to define a display unit on the display screen as a collection of many sub-units, which are independently controllable; when different numbers of sub-units in the unit are selected, the corresponding grayscale level will be obtained; the display pixel composed of the selected combination of sub-pixels with different grayscales will display a new grayscale level. Grayscale expansion is achieved by reducing the resolution. The original screen has n grayscale levels, and the display unit contains i sub-pixels. The expression of the expanded grayscale level N is as follows:

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

[0070] In a specific embodiment, a TFT grayscale dot matrix screen is used with a grayscale level n of 64, a display unit includes 4 sub-pixels, and the expanded grayscale level is 253, thereby improving the accuracy of brightness uniformity control without increasing hardware resources.

[0071] The above contents are further detailed descriptions of the present application in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the inventive concept of the present application.

Claims

1. A highly uniform seamless splicing system for light field display, characterized in that: include: A light-emitting unit, used to generate incident light with multiple controllable indicators, wherein the multiple indicators include brightness, power consumption and divergence angle; A dimming unit, used to adjust the incident light to obtain a rectangular light field with high brightness uniformity; The display splicing unit is used to optically expand the rectangular light field to obtain a display plane with continuous parallax, and the display plane is used to display media content.

2. The highly uniform seamless splicing 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 the light sources, where N≥10 7 ; The driving module is used to achieve matching control of output current and voltage to ensure that the array light source has stable brightness.

3. The highly uniform seamless splicing system for light field display according to claim 1, characterized in that: The dimming unit includes a light extinction module and a dynamic light equalization module; The extinction module is used to generate a light field area of ​​a preset size, and eliminate stray light through a multi-level wedge structure to reduce crosstalk, wherein the preset size = A ≥ 6.1 inches; The dynamic light-averaging module collects brightness data in real time to adjust the brightness uniformity of the light field area.

4. The highly uniform seamless splicing system for light field display according to claim 3, characterized in that: The dynamic light-averaging module includes a brightness sensing circuit, a voltage conversion circuit, a microcontroller, a reset circuit and a brightness control module; The brightness sensor circuit collects brightness data in real time and transmits it back to the controller; The voltage conversion circuit provides a stable voltage for each circuit module; The microcontroller is used to receive the brightness data and generate a dimming control signal; The reset circuit realizes the reset of the dynamic light averaging module; The brightness control module is used to receive a dimming control signal and achieve high brightness uniformity by changing the light source intensity and transmittance.

5. The highly uniform seamless splicing system for light field display according to claim 4, characterized in that: The brightness control module includes a light source driving circuit and a transmittance adjustment circuit, and the dimming control signal includes a light source adjustment sub-signal and a transmittance adjustment sub-signal. The light source driving circuit controls the driving module of the light emitting unit according to the light source adjustment sub-signal to perform brightness compensation on the low illumination area; The transmittance adjustment circuit changes the light intensity of the light field area according to the transmittance adjustment sub-signal to achieve pixel-level brightness uniformity control.

6. The highly uniform seamless splicing system for light field display according to claim 1, characterized in that: The display splicing unit includes a condenser lens, a display screen and a Fresnel lens; The condenser lens is disposed at the front end of the light emitting unit, and is used to focus the light of each pixel in the rectangular light field, and adjust the divergence angle to achieve axial displacement of the imaging surface; The display screen is arranged at the front end of the condenser lens, has high resolution and narrow physical border, and eliminates physical seams through optical expansion of the pixel matrix; The Fresnel lens is arranged at the front end of the display screen at a preset distance, and is used to deflect light into parallel light to form a uniform collimated backlight. Said 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 length of the display area after optical expansion, b all is the width of the display area 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.

7. A brightness adjustment method for light field display, applied to any high uniform seamless splicing system of claims 1 to 6, wherein the high uniform seamless splicing system comprises a light emitting unit, a dimming unit and a display splicing unit, characterized in that: The brightness adjustment method comprises: The dimming unit performs initialization and sets an initial state to calibrate the brightness of the light generated by the light emitting unit; Acquiring brightness data generated by the light-emitting unit or brightness data generated by the display plane; Processing the brightness data to calculate brightness uniformity; A numerical judgment is made on the brightness uniformity. When the brightness uniformity is less than the minimum set threshold, brightness compensation is performed on the low illumination area. When the brightness uniformity is greater than the minimum set threshold and less than the set target value, pixel-level brightness uniformity is adjusted by changing the transmittance. When the brightness uniformity reaches the set target value, the control frequency of brightness refresh is reduced.

8. The brightness adjustment method for light field display according to claim 7, characterized in that: The calculation method of brightness uniformity is as follows: Assume that the high uniform seamless splicing system is composed of n units, and obtain the brightness matrix L1, L2, L3...L corresponding to the n units n , where L m [i,j]=l i,j,m represents the pixel brightness value of row i and column j in unit m. The resolution of a single imaging area is i×j. The brightness uniformity is expressed as Among them, min(L m [i,j]) is the minimum brightness value, max(L m [i,j]) is the maximum brightness value.

9. The brightness adjustment method for light field display according to claim 7, characterized in that: The brightness compensation is performed for the low illumination area. The specific operation is: select the minimum brightness value min (L m [i,j]) where the m unit is located, the driving current of the light-emitting unit is increased until U>U T , where U T Set the threshold value for minimum.

10. The brightness adjustment method of light field display according to claim 7, characterized in that: Changing the transmittance to adjust the pixel-level brightness uniformity of the high uniform seamless splicing system, the specific operation is: 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 Adjust the light intensity at the pixel level until U>U S , where U S To set the target value.

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