CN119964468B - A highly uniform seamless splicing system and brightness adjustment method for light field display - Google Patents
A highly uniform seamless splicing system and brightness adjustment method for light field displayInfo
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Abstract
The application discloses a high-uniformity seamless splicing system and a brightness adjusting method for light field display, and belongs to the technical field of light field display. The system realizes ultrahigh resolution display by using a minimum display unit modularized splicing architecture, realizes axial displacement of an imaging surface by adopting a composite micro-lens array, covers gaps between adjacent display units by optical expansion of a pixel matrix, and eliminates parallax faults caused by physical splice. The system integrates a distributed dynamic light homogenizing module, acquires brightness data of a display area in real time, performs brightness compensation on a low-illumination area through driving control of an array light source, and changes light transmittance to perform pixel-level brightness uniformity regulation and control on the system. The scheme effectively solves the problems of pixel continuity loss and adjacent dimming area optical coupling in high-resolution optical field reconstruction. The system is widely applicable to three-dimensional display of a light field, and is a scheme for improving the three-dimensional display effect.
Description
Technical Field
The application relates to the technical field of light field display, in particular to a high-uniformity seamless splicing system for light field display and a brightness adjusting method.
Background
In the physical world, human visual perception is three-dimensional, however, the images provided by the traditional display technology have only two dimensions, and the stereoscopic vision characteristics of human eyes cannot be fully mobilized. The stereoscopic display technology can provide depth information such as distance, spatial position and the like of objects, and the restored real scene is more real, so that better visual experience is provided for people. Among them, the light field display technology has the advantages of wide depth of display picture, continuous viewpoint, good stereoscopic impression, etc., and becomes the focus of the next generation stereoscopic display technology.
The light field displays the reappearance light from the angle of the full light function, and the naked eye three-dimensional visual effect without auxiliary equipment is realized by reconstructing the complete distribution of the light rays emitted by the object in the space. The core of the technology is to precisely control the direction and intensity of light rays so as to reconstruct real three-dimensional light field information.
Because of the need to record both spatial and angular information, light field displays require far higher pixel density than traditional two-dimensional displays. Traditional display screens are limited by single-screen physical pixel density, and the requirement of light field display on high pixel number is difficult to meet. High resolution is usually realized by using a multi-screen splicing method, but black frames between adjacent display units can cause interruption of pixel continuity during splicing, form visual faults and seriously influence parallax continuity of light field reconstruction. Meanwhile, the light field display requires extremely strict uniformity of light intensity distribution. The brightness difference of the display subareas caused by splicing, particularly the brightness gradient mutation caused by the optical coupling effect between adjacent areas, can cause the phase consistency damage of the reconstructed light beams and influence the stereoscopic vision effect of the light field display.
Aiming at the current problems in the field of high-resolution light field display, a seamless splicing system capable of realizing high brightness uniformity is needed to meet the severe requirements of light field display on visual quality and system performance.
Disclosure of Invention
Aiming at the existing problems in the field of high-resolution light field display, the application provides a high-uniformity seamless splicing system and a brightness adjusting method for light field display, and aims to realize ultrahigh resolution through a modularized splicing architecture and simultaneously ensure the continuity of displayed pixels and brightness uniformity, and provide a light field display effect with higher picture quality and better stereoscopic impression.
According to a first aspect of the application, the application provides a high-uniformity seamless splicing system for light field display, which comprises a light-emitting unit, a dimming unit and a display splicing unit, wherein the light-emitting unit is used for generating a plurality of incident light rays with adjustable and controllable indexes, the plurality of indexes comprise brightness, power consumption and/or divergence angles, the dimming unit is used for adjusting and controlling the incident light rays to obtain a rectangular light field with high brightness uniformity, the display splicing unit is used for optically expanding the rectangular light field to obtain a display plane with continuous parallax, the display plane is used for displaying media content, and the media content is a light field display signal input through a display screen in the display splicing unit.
The light-emitting unit further comprises an array light source and a driving module, wherein the array light source is used for obtaining N light rays through closely arranging the light-emitting sources, N is more than or equal to 10 7, and the driving module is used for realizing matching control of output current and voltage and guaranteeing stable brightness of the array light source.
Preferably, the driving module is a constant current driving and provides overcurrent protection, short-circuit protection, overheat protection, and error detection functions.
The dimming unit comprises a dimming module and a dynamic light homogenizing module, wherein the dimming module is used for generating a light field area with a preset size, the preset size is the size of a conventional display screen area, stray light is eliminated through a multistage wedge-shaped structure, crosstalk is reduced, the preset size=A is more than or equal to 6.1 inches, and the dynamic light homogenizing module is used for collecting brightness data in real time and regulating and controlling brightness uniformity of the light field area.
The dynamic light homogenizing module comprises a brightness sensing circuit, a voltage conversion circuit, a microcontroller, a reset circuit and a brightness regulation module, wherein the brightness sensing circuit is used for collecting brightness data in real time and transmitting the brightness data back to the controller, the voltage conversion circuit is used for providing stable voltage for each circuit module, the microcontroller is used for receiving the brightness data and generating a dimming control signal, the reset circuit is used for resetting the dynamic light homogenizing module, and the brightness regulation module is used for receiving the dimming control signal and realizing high brightness uniformity by changing the intensity and the light transmittance of a light source.
The brightness regulation and control module comprises a light source driving circuit and a light transmittance regulation circuit, wherein the light modulation control signal comprises a light source regulation sub-signal and a light transmittance regulation sub-signal, the light source driving circuit controls the driving module of the light emitting unit according to the light source regulation sub-signal to carry out brightness compensation on a low-illumination area, and the light transmittance regulation circuit changes the light intensity of the light field area according to the light transmittance regulation sub-signal to realize pixel-level brightness uniformity regulation and control.
The display splicing unit comprises a condensing lens, a display screen and a Fresnel lens, wherein the condensing lens is arranged at the front end of the light emitting unit and is used for focusing light rays of all pixels in the rectangular light field, the divergence angle is adjusted to realize axial displacement of an imaging surface, the display screen is arranged at the front end of the condensing lens and is provided with a high-resolution and narrow physical frame, physical splice joints 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 the light rays into parallel light to form uniform collimation backlight.
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 display screen effective display area, a active is the display screen effective display area length, and b active is the display screen effective display area width.
According to a second aspect of the present application, the present application provides a brightness adjustment method for light field display, applied to the highly uniform seamless splicing system, comprising:
The method comprises the steps of obtaining brightness data generated by a light emitting unit or brightness data generated by a display plane, processing the brightness data to calculate brightness uniformity, carrying out numerical judgment on the brightness uniformity, carrying out brightness compensation on a low-illumination area when the brightness uniformity is smaller than a minimum set threshold value, carrying out pixel-level brightness uniformity regulation and control by changing light transmittance when the brightness uniformity is larger than the minimum set threshold value and smaller than a set target value, reducing the control frequency of brightness refreshing when the brightness uniformity reaches the set target value, and realizing the real-time regulation and control of the brightness uniformity of a high-uniformity seamless splicing system by repeating all the steps.
Further, the calculation method of the brightness uniformity comprises the steps of providing a high-uniformity seamless splicing system formed by splicing n units, obtaining a brightness matrix L 1,L2,L3……Ln (wherein L m[i,j]＝li,j,m represents brightness values of m units, i rows and j columns of pixels and resolution of a single imaging region is i x j) of each region through the brightness sensing circuit, wherein the brightness uniformity is expressed as follows:
Wherein, min (L m [ i, j ]) is the lowest luminance value, and max (L m [ i, j ]) is the highest luminance value.
Further, the light source driving circuit performs brightness compensation for the low-illumination area, specifically includes the steps of gating the light source driving circuit of m units where the lowest brightness value min (L m [ I, j ]), increasing the driving current delta I of the corresponding light source, and cycling the above process until U > U T, wherein U T is the minimum set threshold.
Further, the light transmittance adjusting circuit changes the light transmittance to adjust and control the pixel-level brightness uniformity of the high-uniformity seamless splicing system, specifically, the method comprises the following steps of setting a dimming target value as a lowest brightness value l s＝min(Lm [ i, j ]), and the brightness and the light transmittance of any pixel point of the display plane are expressed as follows:
And regulating and controlling the light intensity at the pixel level through the light transmittance regulating circuit, and circularly refreshing until U is more than U S, wherein U S is a set target value.
The beneficial effects are that:
The application provides a high-uniformity seamless splicing system for light field display and a brightness adjusting method, which effectively breaks through the limitation of the pixel density of a traditional display screen through a modular splicing architecture of a minimum display unit and achieves the display purpose of ultrahigh resolution. The array lens is utilized to realize axial displacement of an imaging surface, the gaps between adjacent display units are covered through optical expansion of a pixel matrix, and parallax faults caused by physical joint seams are eliminated. Meanwhile, the brightness uniformity of the system is improved by adopting light source regional dimming and pixel-level light transmittance dimming, dark spots and light coupling phenomena are eliminated, a more vivid and immersive light field display effect is presented, and the scheme for meeting the requirements of light field display on visual quality and system performance is adopted.
Drawings
FIG. 1 is a schematic diagram of a high uniformity seamless stitching system for light field display in accordance with an embodiment of the present application;
FIG. 2 is a schematic diagram of the seamless spliced beam modulation in an embodiment of the present application;
FIG. 3 is a schematic circuit diagram of a dynamic dimming module according to an embodiment of the present application;
FIG. 4 is a flow chart illustrating a method for adjusting brightness of a light field display according to an embodiment of the application;
fig. 5 is a schematic diagram of a gray scale expansion algorithm according to an embodiment of the application.
Detailed Description
In the description of the present application, it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present application.
The application will be described in further detail by the following detailed description and the accompanying drawings
The application discloses a high-uniformity seamless splicing system for light field display, the structure of which is shown in fig. 1, and the display system mainly comprises a light-emitting unit 110, a dimming unit 120 and a display splicing unit 130. The following description will be given separately.
The light emitting unit 110 may be a closely arranged LED array driven by a multi-channel constant current driving chip, for generating a sufficient number of stable and controllable incident light rays, and meanwhile, it is required to meet the indexes of brightness, power consumption, divergence angle, and the like.
The dimming unit 120 is configured to regulate the light generated by the light emitting unit 110, so as to obtain a rectangular light field with high brightness uniformity. The light regulation comprises two parts, namely eliminating system stray light and improving brightness uniformity. The rectangular light field here is the area light field of the stitching unit.
The display splicing unit 130 is configured to expand the rectangular light field generated by the dimming unit 120, and the microarray lens enlarges the display effective area to cover the gap between adjacent display units, so as to eliminate the physical splice and realize the parallax continuity of the system. The physical splice here includes a physical gap between the black border of the display screen and the display splice unit.
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, the arrangement interval is optimally designed according to the resolution requirement of light field display, the generation of enough light rays is ensured, the output current and the voltage of the driving module 12 can be dynamically adjusted according to the brightness requirement, and the stable light output of the light emitting unit 110 can be ensured under different working conditions. It can be understood that the driving module 12 can be a TLC5927 multichannel constant current driving chip, the chip adopts a saturated MOS tube type constant current driving structure, and has 16 channels of output, and can drive one LED in parallel according to the current multichannel required by the LED. The chip also integrates overcurrent protection, short-circuit protection, overheat protection and error detection functions.
In a specific embodiment, the dimming unit 120 includes a extinction module 13 and a dynamic light balancing module 14. The extinction module 13 is a prismatic table-shaped structure, the light-emitting unit 110 is arranged at the lower bottom of the prismatic table, the display unit 130 is arranged at the upper top of the prismatic table, and a multistage wedge-shaped platform is arranged in the structure and used for eliminating edge stray light in a reflecting manner, reducing crosstalk and obtaining a rectangular light field with a clear boundary. The dynamic light homogenizing module 14 collects the brightness data of the light field area in real time, and realizes brightness uniformity regulation and control through feedback control. The brightness uniformity dimming herein is a hierarchical dimming including area light source dimming and pixel level light transmittance dimming.
In a specific embodiment, the display stitching unit 130 includes a condenser lens, a display screen, and a fresnel lens. The condensing lens 15 compresses the divergence angles of the light rays in different directions, the maximum value is obtained in the diagonal direction, and the divergence angles in other directions are reduced according to a certain rule, so that more light rays are focused into a rectangular light field, and the light efficiency is improved. The axial displacement of the imaging surface is realized by adjusting the divergence angle, the display screen can be a 2560 x 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 may greatly interfere with the display effect, where the influence of the upper and lower frames is more significant. In order to eliminate the influence, in the design process of the display system, a method of enlarging the area of the effective area to the display plane and then splicing the effective area to achieve seamless splicing is adopted, and the Fresnel lens 17 is used for deflecting light rays into parallel light to form uniform collimation backlight and simultaneously serve as a display imaging plane.
In a specific embodiment, fig. 2 shows a schematic diagram of light beam regulation of a display system, where an array light source in a light emitting unit has a plurality of light emitting sources L1 closely arranged, and a front end of each light emitting source L1 has a corresponding extinction module L2, a dynamic light homogenizing module L3, a condensing lens L4, and a display screen L5. The beam regulation and control mainly controls the divergence angles of the light source in all directions. The size of the divergence angle is related to the positions of the light source, the display screen plane and the imaging plane, the directional light is not diffused enough, the black edge joint still exists, the directional light is diffused too much, the illumination areas of the backlight light sources at the original joint are overlapped, the brightness is superposed, and the watching effect is also influenced. The seamless splicing scheme of the display system is specifically described below.
The light emitting source L1 can be a high-density LED array, the light emitting area of a single LED lamp bead is 3.45mm, the light emitting angle is 125 degrees, and a spherical light field is generated. The extinction module L2 may have a prismatic structure made of a light absorbing material, and has a length x. The dynamic light homogenizing module L3 regulates and controls the light intensity of each pixel in the rectangular light field, so that the uniformity of the brightness of the system is higher than a set target value U s. The condensing lens L4 compresses the divergence angle sigma of light rays in different directions, the maximum value is 12.2 degrees in the diagonal direction, and the divergence angles in other directions are reduced according to a certain rule, and the minimum value is 8.7 degrees. The range a active of the working area of the display L5 is a active long and b active wide. The fresnel lens L6 is placed at the axially displaced imaging plane x l, where the sub-display area is a all, a all long and b all wide.
Wherein, the compressed divergence angles of the horizontal direction and the vertical direction are respectively:
the distance expression of the axial displacement of the imaging surface is as follows:
in a specific embodiment, fig. 3 shows a schematic circuit diagram of the dynamic dimming module. The structure of the dynamic dimming module is specifically described below.
The dynamic light equalizing module comprises a brightness sensing circuit 31, a voltage converting circuit 32, a microcontroller 33, a reset circuit 34 and a brightness regulating module 35. The brightness sensing circuit 31 can be a distributed high-sensitivity photodiode array, and can collect system brightness data through an industrial camera, the voltage conversion circuit 32 can provide stable 3.3V, 5V and 12V voltages for all circuit modules, the microcontroller 33 can be a single chip microcomputer and is used for receiving the brightness data collected by the brightness sensing circuit, generating dimming control signals and sending the dimming control signals to the TLC5927 light source driving chip and the brightness regulation module 35 respectively, the reset circuit 34 is used for shielding the control signals of the microcontroller 33 and recovering the brightness regulation module 35 to an initial state, and the brightness regulation module 35 is used for receiving the dimming control signals (the dimming control signals comprise a light source regulation sub-signal and a light transmittance regulation sub-signal) of the microcontroller 33 and realizing high brightness uniformity through changing the light source intensity and the light transmittance.
In one embodiment, the brightness adjustment 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 switch circuit, which can realize the control of output current by switching the external resistor of the TLC5927 chip to carry out brightness compensation on the low illumination area, and the light transmittance adjusting circuit 37 can be a high-resolution black-white TFT lattice screen, which can realize the regulation and control of the brightness uniformity of the pixel level by controlling the gray scale of the pixel to change the intensity of the corresponding light.
The application also discloses a brightness adjusting method of the light field display, which is applied to the dimming unit 120 in the high-uniformity seamless splicing system, as shown in fig. 4. And the dark spots and the light coupling phenomenon are eliminated by adopting regional light source dimming and pixel-level light transmittance dimming, so that the brightness uniformity of the display system is improved. The following description will be given separately.
In step S10, the dimming unit 120 performs initialization and sets an initial state to complete calibration, specifically, sets initial states of the light source driving circuit and the light transmittance circuit. The light source driving circuit initial state control TLC5927 chip outputs half of the maximum current. The initial state of the light transmittance circuit controls the black-and-white TFT dot matrix to display the highest gray scale.
It should be noted that the gray scale may be different brightness levels from darkest to brightest in the image frame, and the gray scale is generally classified into 0-255 levels, where 0 represents darkest and 255 represents brightest.
In step S20, the dimming unit 120 obtains the brightness data of the light emitting unit 110 from the brightness sensing circuit and transmits the brightness data back to the controller, and the collection frequency and the data back frequency can be controlled by the microcontroller, so as to reduce the system power consumption.
Step S30, preprocessing the brightness data and calculating the current brightness uniformity of the system
The system is formed by splicing n units, a brightness matrix L 1,L2,L3……Ln (wherein L m[i,j]＝li,j,m represents brightness values of pixels in m regions, i rows and j columns, and the resolution of a single imaging region is i x j) of each region is obtained through a brightness sensing circuit, and the brightness uniformity of the system is expressed as follows:
wherein, min (L m [ i, j ]) is the system minimum brightness value, and max (L m [ i, j ]) is the system maximum brightness value.
Step S40, the dimming unit 120 compares the brightness uniformity value U with a set minimum threshold U T
In step S41, the dimming unit 120 operates to perform brightness compensation on the low illuminance region by the light source driving circuit when the brightness uniformity value is less than the set minimum threshold. And (3) a light source driving circuit of an m region where the lowest brightness value min (L m [ I, j ]) of the gating system is positioned reduces the external resistance value of the TLC5927 chip, improves the driving current delta I of the corresponding light source, and circulates the process until U > U T, wherein U T is the minimum set threshold value.
In step S50, the dimming unit 120 compares the brightness uniformity value U with the set target value U S
In step S51, the dimming unit 120 performs an operation to adjust and control the brightness uniformity at the pixel level by changing the light transmittance through the light transmittance adjusting circuit when the brightness uniformity is greater than the minimum set threshold and less than the set target value. Let the dimming target value be the system minimum brightness value l s＝min(Lm [ i, j ]), the brightness transmittance at any point of the system is expressed as follows:
and mapping the light transmittance matrix into a display gray-scale matrix of the TFT gray-scale screen, regulating and controlling the light intensity at a pixel level, and circularly refreshing until U > U S, wherein U S is a set target value.
In step S60, the dimming unit 120 performs an operation to decrease the control frequency of brightness refresh when the brightness uniformity reaches the set target value
And repeating the steps to realize the real-time regulation and control of the brightness uniformity of the system.
In one embodiment, fig. 5 shows a schematic diagram of a gray scale expansion algorithm. The gray scale expansion algorithm based on the TFT gray scale screen will be specifically described below.
The accuracy of brightness uniformity control is mainly dependent on the gray scale level of the TFT gray scale lattice screen, which is limited by the cost and process of the screen. In order to achieve a better regulation and control effect and further improve uniformity of the display screen, a gray scale expansion method is used in the system. Several pixels are combined into one pixel, and the gray level of each pixel is determined by the average value of the gray level of the sub-pixel.
The display device is characterized in that a display unit on a display screen is defined as a set of a plurality of sub-units which can be controlled independently, when different numbers of the sub-units in the unit are gated, corresponding gray levels are obtained, and a display pixel formed by gating combinations of sub-pixels with different gray levels can display new gray levels. The gray scale expansion is realized by reducing the resolution. The original screen has N levels of gray scales, and the display unit comprises i sub-pixels, and the expression of the extended gray scale level N is as follows:
N=i(n-1)+1 (6)
In a specific embodiment, the TFT gray-scale dot matrix screen is used, the gray-scale number n is 64, the display unit includes 4 sub-pixels, the expanded gray-scale level is 253, and the accuracy of brightness uniformity regulation is improved under the condition that hardware resources are not increased.
The foregoing is a further detailed description of the application in connection with specific embodiments, and it is not intended that the application be limited to such description. It will be apparent to those skilled in the art that several simple deductions or substitutions can be made without departing from the inventive concept.
Claims (7)
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| WO2011113374A1 (en) * | 2010-03-18 | 2011-09-22 | 深圳市光峰光电技术有限公司 | Display methode and display device |
| US9684483B2 (en) * | 2012-11-01 | 2017-06-20 | Lellan, Inc. | Seamless illuminated panel |
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| CN101556425A (en) * | 2009-04-29 | 2009-10-14 | 广东威创视讯科技股份有限公司 | Seamless splicing method of back projection unit and special optical structure |
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