CN116721603A - Seamless display system of spliced screen - Google Patents

Seamless display system of spliced screen Download PDF

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Publication number
CN116721603A
CN116721603A CN202310507099.3A CN202310507099A CN116721603A CN 116721603 A CN116721603 A CN 116721603A CN 202310507099 A CN202310507099 A CN 202310507099A CN 116721603 A CN116721603 A CN 116721603A
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China
Prior art keywords
unit
image
displayed
images
spliced
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Pending
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CN202310507099.3A
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Chinese (zh)
Inventor
刘胜林
王辉
孙利强
朱琦
景栀子
周文光
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Hangzhou Chenjing Photoelectric Technology Co ltd
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Hangzhou Chenjing Photoelectric Technology Co ltd
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Priority to CN202310507099.3A priority Critical patent/CN116721603A/en
Publication of CN116721603A publication Critical patent/CN116721603A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/35—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being liquid crystals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention discloses a spliced screen seamless display system, which comprises a spliced display screen, a lens array and a rear projection scattering film, wherein the spliced display screen, the lens array and the rear projection scattering film are arranged in parallel, the lens array is arranged between the spliced display screen and the rear projection scattering film, downsampling is carried out on an image to be displayed, the downsampled image to be displayed is equally divided into a plurality of square unit images to be displayed with the side length of Ls, the unit images to be displayed form a unit image array to be displayed, the unit images are intercepted in the unit image array to be displayed according to a pixel interval delta, any unit image and surrounding adjacent unit images are respectively separated by delta pixels in the row and column directions, the unit images are subjected to mirror image overturning and then are displayed through the spliced screen, the unit images displayed by the spliced screen are aligned with the lenses in the lens array in a one-to-one center mode, and the lens array amplifies the unit images displayed by M times and overturns and projects the unit images to the rear projection film to form unit reconstructed images, and the unit reconstructed images are mutually spliced into seamless images to be displayed.

Description

Seamless display system of spliced screen
Technical Field
The invention belongs to the technical field of large-screen spliced display, and particularly relates to a spliced screen seamless display system.
Background
Displays with areas generally exceeding 1 square meter may be referred to as large screen displays, which are now becoming more strongly desired for larger area displays, especially in exhibitions, large conferences and outdoor advertising, which have become a standard facility. The main stream of large screen products in the market at present are several types such as projection, LED display screen, liquid crystal spliced screen and the like.
DLP is the projection display technology of current mainstream, has advantages such as seamless concatenation, large-scale picture, high image quality, but the image quality is easily influenced by ambient light, and when the environment is comparatively bright, ambient light can suppress screen brightness, leads to the projection picture to produce the condition of grey hair. The light source bulb of the DLP has large power consumption and high heat dissipation, the bulb needs to be replaced frequently to keep good display effect, in addition, a projection space is required to be reserved for a projector, and if the light source bulb is shielded in the space where a projection light path passes, the projection light source bulb can influence the look and feel.
The LED screen picture display is not fine enough and the cost is high, so that the LED screen picture display is mostly used for outdoor advertisement display. As technology advances, small pitch LEDs have been developed. The pixel spacing is reduced, so that the fineness of the picture of the LED screen is greatly improved, the granular sense is reduced, and nevertheless, compared with a liquid crystal display screen, the granular sense is quite obvious and the cost is high. In addition, the LED lamp beads are easy to drop, so that the picture is damaged, which is troublesome in subsequent maintenance and is an unavoidable defect.
The liquid crystal spliced screen rapidly obtains nearly 1/4 of the market share of large screen splicing in a short period of years by virtue of the advantages of high definition, high brightness, high color saturation, flexible and changeable splicing mode, environmental protection, long service life, low operation and maintenance cost and the like. However, the liquid crystal is spliced with a fatal injury, i.e., a splice that cannot be eliminated. Despite the much effort that has been made to make the physical seams of lcd panels smaller and smaller, it has been reported that at present, a seam of 0.88 is achieved, but the visible gap grid still affects the overall feel of the picture. As shown in fig. 1.
Disclosure of Invention
In order to solve the defect that the existing liquid crystal splicing cannot eliminate the splice joint, the invention is based on the integrated imaging seamless splicing large-screen display principle that the pixels of the video image to be displayed are recoded and arranged, the rearranged video is displayed through a liquid crystal spliced display screen, then the image displayed by the spliced display screen is reconstructed by utilizing a lens array, and finally, the seamless continuous image display can be obtained.
The technical scheme of the invention is as follows: the seamless display system of the spliced screen comprises a spliced display screen, a lens array and a rear projection scattering film which are arranged in parallel, wherein the lens array is arranged between the spliced display screen and the rear projection scattering film, downsampling is carried out on an image to be displayed, the downsampled image to be displayed is equally divided into a plurality of square unit images to be displayed with the side length of Ls, the unit images to be displayed form a unit image array to be displayed, the unit images to be displayed are intercepted in the unit image array according to a pixel interval delta, any unit image and surrounding adjacent unit images are respectively separated by delta pixels in the row and column directions, the unit images are subjected to mirror image overturning and then displayed through the spliced screen, the unit images displayed by the spliced screen are aligned with the lenses in the lens array in a one-to-one mode, and the lens array amplifies the unit images displayed by the spliced screen by M times and overturns and projects the unit images to the rear projection film to form unit reconstructed images, and the unit reconstructed images are mutually spliced into seamless images to be displayed;
ls is determined by the undistorted object square field of view of the middle unit lenses of the lens array, and the gap width between the unit images of the spliced screen display screen is S l The center distance P of adjacent lenses in the lens array in the row or column direction is more than or equal to S l +L s ，M≥P/L s And M is P/L s The number of lenses is an integer multiple offix represents taking in the zero directionFinishing M s ×N s D, for the pixel number of the spliced display screen s For the pixel interval of the spliced display screen, the pixel number of each unit image is L pix ×L pix ，L pix ＝L s /d s The number of pixels of the cell reconstruction>Pixel interval +.>round represents rounding, N s 、N i 、N Ls The number of the image pixels of the spliced display screen in the column direction, the number of the image pixels to be displayed after downsampling, the number of lenses and M s 、M i 、M Ls The number of pixels of the spliced display screen image in the row direction, the number of pixels of the image to be displayed after downsampling and the number of lenses are respectively.
Further, the downsampling means: the resolution of the image to be displayed is defined by M s ×N s Is adjusted to M i ×N i . The resolution of the image to be displayed after downsampling is 1/M times of that of the image to be displayed in the original spliced screen, and M is the unit lens magnification:s is an integer other than zero, P is the lens array pitch, ls is the unit image side length.
Further, the unit images are taken from the first row and the first column in the unit image array, and M is taken altogether Ls ×N Ls The mth of the unit image, the interception Ls Row, n Ls Unit images EI of columns mLsnLs The method comprises the following steps:
the number of unit images of the unit image array is identical to the number of lenses of the lens array.
It should be noted that the present invention achieves the goal of eliminating the seams by sacrificing some of the resolution of the display. Even so, the resolution of the final display is still far higher than that of a common LED display, for example, the pixel interval of a 4K65 inch liquid crystal screen is 0.372mm, and when the 3X 3 splicing is carried out on the liquid crystal screen, the final seamless display pixel interval is 0.56mm; if the 8K65 inch LCD screen is used for splicing, the final seamless image pixel interval is only 0.23mm.
Drawings
FIG. 1 is a schematic diagram of a tiled display screen in the prior art;
FIG. 2 is a schematic diagram of a seamless tiled large screen display of the present invention;
FIG. 3 is a schematic diagram of a seamless tiled display method of the present invention;
FIG. 4 is an example of pixel rearrangement encoding of the present invention;
FIG. 5 is a schematic diagram of a seamless tiled display when the unit images are not reconstructed;
FIG. 6 is a schematic diagram after seamless mosaic display during unit image reconstruction;
FIG. 7 is a view of a display of successive images on a diffuser screen using the method of the present invention;
fig. 8 is a schematic diagram of a cell image array.
Detailed Description
The invention is based on the integrated imaging seamless splicing large screen display principle that the pixels of the video image to be displayed are recoded and arranged, the rearranged video is displayed through the liquid crystal splicing screen, then the lens array is utilized to reconstruct the image displayed by the splicing screen, and finally, the seamless continuous image display can be obtained. As in fig. 2.
The principle of the seamless tiled display method of the present invention will be described below with reference to fig. 3. In fig. 3, an array of lenses, each lens in the array being referred to as a "cell lens", is placed in front of the tiled screen, and the cell lens can magnify a corresponding area on the rear screen. The invention refers to the area image corresponding to the unit lens on the screen as "unit image", for example, unit lenses A and B respectively splice unit image I on the display screen A And I B Imaging asI′ A And I' B When I' A And I' B When just connected, the splice between the two images disappears. We will I' A And I' B Referred to as a "reconstructed image".
Obviously, I' A And I' B Is from two discrete unit images on a tiled display screen in order to make I' A And I' B Continuously, must be matched with I A And I B Recoding is performed. Let I' A And I' B 4 pixels are respectively arranged, and the pixel serial numbers of the corresponding continuous images are 1,2,3 and 4; and 5,6,7,8. The corresponding unit image I A And I B The prime numbers are shown in FIG. 3.
In FIG. 3, the pitch P of adjacent unit lenses is called pitch, and the slit of the tiled display screen is S l Pitch P must be greater than S l 。
Fig. 4 gives an example of pixel rearrangement encoding. The first dotted line box from left to right shows a schematic diagram of the pixel distribution of the spliced display screen and its corresponding original image, and the region shown in the figure has 56 pixels, and the pixels at the splice joints 26, 27, 28 and 29 are missing.
The first large dashed box on the right shows the result after reforming the pixels based on integrated photographic technology, and a continuous image display is obtained on the scattering surface. It can be seen that the last displayed image is the result of the image reconstruction within the second left to right dashed box after Downsampling (Downsampling) of the original image. The downsampled image is divided into unit images, then pixel overturning arrangement is carried out according to the mirror image imaging requirement, and the unit images are displayed in the area of the unit lenses corresponding to the downsampled image on the spliced display screen, and the small virtual frame in the first large dotted frame on the right side of fig. 4 is seen.
As can be seen from FIG. 4, the original slit S is enlarged by the lens l The missing pixels are padded. Let the unit image size that each lens can image be L s The pitch of the lens is P, when L s When amplifying to P, L s The corresponding pixels can be just displayed without gaps on the scattering surface, and the pitch P of the lens array is more than or equal to S l +L s Magnification M of lens at this time 0 The method comprises the following steps:
M 0 ＝P/L s (1)
unit image size L s Determined by the optical characteristics of the unit lenses and the pitch P, L is first s Cannot be greater than pitch P, namely:
L s ≤P(2)
then determining L by experimentally testing the size of the object field of view of the actual unit lens in undistorted imaging s . Ls cannot be larger than the object field of view.
Since the area displayed by the diffusion screen and the area displayed by the first virtual frame from left to right are identical in size, and the image displayed by the diffusion screen is a display result after enlarging M, this means that in order for the image displayed by the diffusion screen to be identical with the image displayed by the first virtual frame from left to right, the image displayed by the first virtual frame from left to right must be reduced by M times. For digital images, the so-called downsampling is the downsampling of the first left to right frame pixel when m=2 is shown in the second left to right frame.
Fig. 3 or fig. 4 shows that the images of adjacent lenses are just connected, and in fact, the seamless reconstruction can be obtained as long as the lens magnification is larger than the formula (1), but two problems will occur if the pixels of the unit images are still arranged as above:
1. the pixels of the reconstructed image overlap each other, for example 4 and 5 pixels, 8 and 9 pixels, 12 and 13 pixels. This pixel overlap will cause a severe blurring of the reconstructed image.
2. The pixels overlap unevenly, e.g. 2 nd, 3 rd pixels, 6 th, 7 th pixels, 14 th, 15 th pixels have no pixels overlapping with them. The overlapping areas will be brighter and the areas not overlapping will be darker. This results in non-uniform brightness of the reconstructed image, which eventually appears as a grid of alternating brightness due to the periodic array of cell lenses.
The solution to this problem is to ensure that the reconstructed image is uniform in brightness. To achieve this, it is only necessary that the magnification of the unit lenses is M in formula (1) 0 Is an integer multiple of (a). FIG. 6 shows that the unit lens magnification is M 0 Is 2 times the unit image reconstruction map.
At this time, all pixels in the reconstruction area corresponding to the two middle unit lenses B and C are overlapped two by two, and as the unit lenses which are not shown are still arranged outside the lenses a and D, the reconstruction areas corresponding to the lenses a and D should be overlapped two by two, so that the problem of uneven brightness of the reconstructed image is solved. It can be demonstrated that if the magnification of the unit lens is M in formula (1) 0 And the reconstructed image has S pixels overlapping at each point.
However, overlapping pixels at this time will result in blurring of the reconstructed image. The problem is solved by resampling the original image and re-encoding the unit image. In fig. 6 the pixel overlap area should have 12 pixels displayed, because of the overlap, 3 and 5,4 and 6,7 and 9, which is combined into one pixel, now let 3 and 5 display the same pixels 4,4 and 6 and pixels 6,7 and 9 and pixels 8, …, as shown in fig. 6. At the same time, the unit images are reordered as required by the reconstructed image, as shown in fig. 7.
Fig. 7 can be understood as follows: if it is desired to display successive images 2, 4, 6, 8, 10, … on the diffuser, the corresponding pixels must be displayed on the tiled display as required in the blue-line virtual box, the image displayed on the tiled display being a mirror image of the element image in the yellow box, and the element view in the yellow box being encoded by downsampling the original image (first box on the left) and reordering (second box on the left).
The key technology of the invention is how to perform the descending order and the reorder coding of the original image. Let the magnification of the unit lens be S times that of formula (1), the total magnification of the lens is:
considering that digital images generally represent resolution in terms of pixels, the above equation can be written in a form that is pixel dependent. Let the pixel interval of the spliced display screen be d s The number of pixels P corresponding to the lens pitch P pix And a unit image L s Corresponding pixel number L pix The method comprises the following steps of:
the total magnification of the lens can be written as:
the reconstructed image is an image enlarged by the lens array, so the pixel interval of the reconstructed image is:
because of the existence of the splice gap, the pixels in the splice screen can be supplemented by lens magnification, and the magnification means that the resolution of the final display is reduced, and the larger the magnification, the lower the resolution. There is no waste of resolution but a sacrifice has to be made in order to repair the splice.
The size of the scattering screen is the same as that of the spliced display screen, the size of the scattering screen in the horizontal direction is Lx, the size of the scattering screen in the vertical direction is Ly, and the number of pixels of the reconstructed image is:
for a lens array with a pitch of P, the number of unit lenses in the horizontal direction is N Ls The vertical direction is M Ls The total number of unit lenses is:
the number of unit images is the same as the number of unit lenses.
And (3) unit image manufacturing:
1) Resampling (downsampling) an image to be displayed (video) to obtain a resampled (video) image I rs . The number of pixels is made equal to the size given by formula (8).
2) From image I rs And the number of unit images determined by the expression (9) is truncated. The number of pixels of each unit image is determined by equation (5), i.e
Taking the horizontal direction as an example, from image I rs Starting to intercept at the top left corner of the first unit view, the array of images intercepted by the first unit view is:
EI 1 ＝I rs [(1:L pix ),(1:L pix )] (11)
the formula (11) represents the unit image EI 1 Is image I rs 1 st to L of (2) pix Lines and 1 st to L pix Pixels of the coordinate area between columns.
Then shifting by delta pixels to the right to intercept the second element image EI 2 ，EI 2 The unit image array is as follows:
EI 2 ＝I rs [(1:L pix ),(1+Δ:L pix +Δ)] (12)
then shifting by delta pixels to the right to intercept the third element image EI 3 ，EI 3 The unit image array is as follows:
EI 2 ＝I rs [(1:L pix ),(1+2Δ:L pix +2Δ)] (13)
similarly, N Ls The individual cell image arrays are:
nth (N) Ls The unit image is the last image taken in the horizontal direction and corresponds to I rs Column number L pix +(N Ls -1) delta should be equal to N in formula (8) i The method comprises the following steps:
L pix +(N Ls -1)Δ)＝N i (15)
from this solution:bringing the variables related to formulas (3) to (9) into formula (16), and finally obtaining:
wherein: l (L) pix For the number of pixels of the unit image,
p is the pitch of the lens array,
L x the dimensions are displayed for the horizontal direction of the diffuser,
s is M 0 ＝P/L s Is a multiple of (1), an integer is taken,
the unit image capturing in the vertical direction is the same as that in the horizontal direction, and then the mth Ls Row, n Ls The unit images of the columns can be collectively expressed as:
3) And carrying out mirror image transformation on the intercepted unit image, namely, turning the unit image up and down and left and right.
4) The mirrored unit images are arranged according to the pitch P to form rearranged video images. Fig. 8 is a schematic diagram of a cell image array.
The spliced screen seamless display system comprises a spliced display screen, a lens array and a rear projection scattering film which are arranged in parallel, wherein the lens array is arranged between the spliced display screen and the rear projection scattering film, and the resolution of an image to be displayed is adjusted to be M i ×N i The image to be displayedEqually divided into a plurality of sides with the length L s The method comprises the steps that (1) unit images to be displayed form a unit image array to be displayed, unit images are intercepted in the unit image array to be displayed according to pixel intervals delta, any unit image and surrounding adjacent unit images are respectively separated by delta pixels in row and column directions when the unit images are intercepted, the unit images are subjected to mirror image overturning and then displayed through a spliced screen, the unit images displayed by the spliced screen are aligned with lenses in a lens array one by one, the lens array amplifies the unit images displayed by the spliced screen by M times and overturning and projecting the unit images onto a rear projection scattering film to form unit reconstructed images, and the unit reconstructed images are spliced into seamless images to be displayed;
ls is determined by the undistorted object square field of view of the middle unit lenses of the lens array, and the gap width between the unit images of the spliced screen display screen is S l The center distance P of adjacent lenses in the lens array in the row or column direction is more than or equal to S l +L s ，M≥P/L s And M is P/L s The number of lenses is an integer multiple offix represents rounding to zero, M s ×N s D, for the pixel number of the spliced display screen s For the pixel interval of the spliced display screen, the number of the downsampled image pixels isThe pixel number of each unit image is L pix ×L pix ，L pix ＝L s /d s Cut-out unit image movement interval->round represents rounding, N s 、N i 、N Ls The number of the image pixels of the spliced display screen in the column direction, the number of the image pixels to be displayed after downsampling, the number of lenses and M s 、M i 、M Ls The number of pixels of the spliced display screen image in the row direction, the number of pixels of the image to be displayed after downsampling and the lens are respectivelyNumber of parts.
The unit image is taken from the pixels of the first row and the first column in the unit image array to be displayed, and M is taken altogether Ls ×N Ls The mth of the unit image, the interception Ls Row, n Ls Unit images EI of columns mLsnLs The method comprises the following steps:
the number of unit images of the unit image array is identical to the number of lenses of the lens array.

Claims (3)

1. A seamless display system of a spliced screen is characterized by comprising a spliced display screen, a lens array and a rear projection scattering film which are arranged in parallel, wherein the lens array is arranged between the spliced display screen and the rear projection scattering film, downsampling is carried out on an image to be displayed, and the downsampled image to be displayed is equally divided into a plurality of edges with the length L s The method comprises the steps that (1) unit images to be displayed form a unit image array to be displayed, unit images are intercepted in the unit image array to be displayed according to pixel intervals delta, any unit image and surrounding adjacent unit images are respectively separated by delta pixels in row and column directions when the unit images are intercepted, the unit images are subjected to mirror image overturning and then displayed through a spliced screen, the unit images displayed by the spliced screen are aligned with lenses in a lens array one by one, the lens array amplifies the unit images displayed by the spliced screen by M times and overturning and projecting the unit images onto a rear projection scattering film to form unit reconstructed images, and the unit reconstructed images are spliced into seamless images to be displayed; ls is not more than the distortionless object square field of view of the middle unit lens of the lens array, and the gap width between the unit images of the spliced screen display screen is S l The center distance P of adjacent lenses in the lens array in the row or column direction is more than or equal to S l +L s ，M≥P/L s And M is P/L s The number of lenses is an integer multiple offixRepresents rounding to zero, M s ×N s D, for the pixel number of the spliced display screen s For the pixel interval of the spliced display screen, the pixel number of each unit image is L pix ×L pix ，L pix ＝L s /d s The number of pixels of the cell reconstruction>Pixel interval +.>round represents rounding, N s 、N i 、N Ls The number of the image pixels of the spliced display screen in the column direction, the number of the image pixels to be displayed after downsampling, the number of lenses and M s 、M i 、M Ls The number of pixels of the spliced display screen image in the row direction, the number of pixels of the image to be displayed after downsampling and the number of lenses are respectively.
2. The tiled, screen seamless display system of claim 1, wherein the downsampled image to be displayed has a resolution that is 1/M times the resolution of the image to be displayed in the original tiled screen, M being the unit lens magnification:s is an integer other than zero, P is the lens array pitch, ls is the unit image side length.
3. The tiled, screen, seamless display system of claim 2, wherein the unit images are truncated starting with pixels of a first row and a first column in the array of unit images, M being a total of truncations Ls ×N Ls The mth of the unit image, the interception Ls Row, n Ls Unit images EI of columns mLsnLs The method comprises the following steps:
unit image arrayThe number of unit images of (a) is identical to the number of lenses of the lens array.
CN202310507099.3A 2023-05-05 2023-05-05 Seamless display system of spliced screen Pending CN116721603A (en)

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