CN112802425A

CN112802425A - Staggered optical gap correction method for LED display unit

Info

Publication number: CN112802425A
Application number: CN202011207343.7A
Authority: CN
Inventors: 汪洋; 陈宇; 郑喜凤; 曹慧; 丁铁夫
Original assignee: Changchun Cedar Electronics Technology Co Ltd
Current assignee: Changchun Cedar Electronics Technology Co Ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-05-14
Anticipated expiration: 2040-11-03
Also published as: CN112802425B

Abstract

The invention relates to a staggered optical gap correction method for an LED display unit, which comprises the following steps: brightening the LED pixels at two sides of the vertical edge seam and the transverse edge seam in a staggered mode, and multiplying the brightening proportion of the brightened LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction. The invention adopts a mode of staggered brightening of pixels on two sides of the optical gap, so that the optical gap is not a straight line any more but a zigzag broken line, the feeling of the gap is lightened, and black lines among the LED display module, the LED display module and the LED display box body can be eliminated more thoroughly by brightening.

Description

Staggered optical gap correction method for LED display unit

Technical Field

The invention belongs to the technical field of optical acquisition and correction of LED display screens, and relates to a display unit staggered optical gap correction method.

Background

The LED display screen is formed by splicing a plurality of display units (usually boxes). The display box bodies are composed of a plurality of modules; the module is composed of a plurality of modules. The splicing gaps among modules, between modules and between boxes are large, and the pixel pitch at the splicing position is larger than the standard pixel pitch. Thus, a black line appears at the display, and the display is regarded as a black line at an effective observation distance. One of the methods for eliminating the black lines from the optical appearance of the observer is to brighten the pixels on both sides of the black lines, that is, to determine the brightness ratio according to the ratio of the pixel pitch between the module, the module and the box obtained by the optical method to the standard pixel pitch to increase the brightness of the pixels on both sides of the optical black line, so that the observer can visually perceive the brightness between the modules to be consistent and the black line cannot be seen in the observation distance. The seam trimming objects are all transverse edge seams and vertical edge seams among all modules.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method for correcting an interleaved optical gap of an LED display unit, wherein the optical gap is not easily perceived by an observer.

In order to solve the above technical problem, the LED display unit staggered optical gap correction method of the present invention is as follows: brightening the LED pixels at two sides of the vertical edge seam and the transverse edge seam in a staggered mode, and multiplying the brightening proportion of the brightened LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

Furthermore, the left column of the vertical edge is only used for brightening LED pixels in odd rows, and the right column of the vertical edge is only used for brightening LED pixels in even rows; brightening the LED pixels in odd columns by one row at the upper side of the horizontal edge seam, and brightening the LED pixels in even columns by one row at the lower side; or the left column of the vertical edge is spliced to brighten the LED pixels in the even rows only, and the right column of the vertical edge is spliced to brighten the LED pixels in the odd rows only; and the upper row of the transverse edge seam only brightens even-numbered rows of LED pixels, and the lower row of the transverse edge seam only brightens odd-numbered rows of LED pixels.

Furthermore, the left column of the vertical edge seam is only used for brightening pixels in double odd lines, and the right column is only used for brightening pixels in double even lines; only double odd-numbered row pixels are brightened in the upper row of the horizontal edge seam, and only double even-numbered row pixels are brightened in the lower row of the horizontal edge seam; or the left column of the vertical edge is spliced to brighten the LED pixels in the even rows, and the right column of the vertical edge is spliced to brighten the LED pixels in the odd rows; the LED pixels in double even rows are only brightened in the upper row of the horizontal edge seam, and the LED pixels in double odd rows are only brightened in the lower row;

further, only the pixels of the 3n +1, 3n +2 and 3n +3 rows are highlighted in the column on the left side of the vertical edge seam, wherein n is 0, 1, 2 … …; only the 3m-2, 3m and 3m +1 rows of pixels are brightened in the column on the right side of the vertical edge joint, wherein m is 1, 2 … …; only brightening the pixels of 3n +1, 3n +2 and 3n +3 columns in the upper row of the transverse edge joint, wherein n is 0, 1 and 2 … …; the lower row of the transverse edge joint only brightens the 3m-2, 3m and 3m +1 columns of pixels, wherein m is 1, 2 … …; or only brightening the 3m-2, 3m and 3m +1 row of pixels in a column on the left of the vertical edge seam, wherein m is 1, 2 … …; one column at the right of the vertical edge joint only brightens the pixels of the 3n +1, 3n +2 and 3n +3 rows, wherein n is 0, 1 and 2 … …; only the 3m-2, 3m and 3m +1 columns of pixels are brightened in a row at the upper edge of the transverse edge joint, wherein m is 1, 2 … …; and the pixels of 3n +1, 3n +2 and 3n +3 columns are only brightened in a row below the transverse edge joint, wherein n is 0, 1 and 2 … ….

Wherein the increment proportion is equal to the interval of the LED pixels at the seam where the LED pixels are positioned divided by the standard LED pixel interval.

The patchwork LED pixel pitch and the standard LED pixel pitch are obtained by adopting the following method:

lightening one single-primary-color LED pixel in three lines of LED wafers on two sides of a vertical edge joint of all modules of the LED display box body; aligning a digital camera viewing frame to the LED display box body for photographing to obtain a photo of the LED display box body;

obtaining the brightening proportion of the vertical edge seams among all modules in the LED display box body by using an envelope method: setting the length of the long strip as the width of a camera view field, and setting the width of the long strip as D0 lines of camera pixels; intercepting the brightness data of the camera pixels in the strip band from the first row, calculating the average value of the brightness data of a plurality of rows of camera pixels in each column, and forming an envelope by the average value of the brightness data of the camera pixels in each column in the strip band; if the peak values of all the envelope peaks are smaller than the gray threshold H0, the long strip moves downwards, and the gray threshold H0 is 20% -50% of the brightness of the lighted LED pixel; until the peak value > H0 appears, determining 1/3 of the highest peak value as H1 to replace H0, calculating the distance D1 between adjacent envelope peaks, and replacing D0 with D1 as the width of a new long strip; moving the long strip downwards, continuously intercepting the brightness data of the camera pixels in the long strip according to the new width D1 of the long strip, calculating the average value of the brightness data of each row of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each row of camera pixels in the long strip; when 3 continuous envelope peaks appear, calculating the positions of the light spot centers of the corresponding three LED pixels according to the average value of the brightness data of each column of camera pixels at the envelope peaks; calculating the space between 2 adjacent LED pixels according to the positions of the light spot centers of the three LED pixels to obtain the LED pixel space of the joint at the joint corresponding to the vertical edge and the standard LED pixel space; continuously moving the long strip downwards to obtain a seam LED pixel interval and a standard LED pixel interval at the vertical edge seam corresponding to the long strip in the same way; and by analogy, the standard LED pixel pitch and the splicing seam LED pixel pitch of the vertical edge splicing seam between the adjacent modules of the whole LED display unit corresponding to each strip belt position are obtained.

Wherein the increment ratio can also be equal to the average seam spacing of the module seam where the LED pixel is located divided by the average standard spacing.

The average splicing gap distance is divided by the average standard gap distance by adopting the following method:

obtaining the brightening proportion of the vertical edge seams among all modules in the LED display box body by using an envelope method: setting the length of the long strip as the width of a camera view field, and setting the width of the long strip as D0 lines of camera pixels; intercepting the brightness data of the camera pixels in the strip band from the first row, calculating the average value of the brightness data of a plurality of rows of camera pixels in each column, and forming an envelope by the average value of the brightness data of the camera pixels in each column in the strip band; if the peak values of all the envelope peaks are smaller than the gray threshold H0, the long strip moves downwards, and the gray threshold H0 is 20% -50% of the brightness of the lighted LED pixel; until the peak value > H0 appears, determining 1/3 of the highest peak value as H1 to replace H0, calculating the distance D1 between adjacent envelope peaks, and replacing D0 with D1 as the width of a new long strip; moving the long strip downwards, continuously intercepting the brightness data of the camera pixels in the long strip according to the new width D1 of the long strip, calculating the average value of the brightness data of each row of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each row of camera pixels in the long strip; when 3 continuous envelope peaks appear, calculating the positions of the light spot centers of the corresponding three LED pixels according to the average value of the brightness data of each column of camera pixels at the envelope peaks; calculating the space between 2 adjacent LED pixels according to the positions of the light spot centers of the three LED pixels to obtain the LED pixel space of the joint at the joint corresponding to the vertical edge and the standard LED pixel space; continuously moving the long strip downwards to obtain a seam LED pixel interval and a standard LED pixel interval at the vertical edge seam corresponding to the long strip in the same way; by analogy, the standard LED pixel pitch and the splicing seam LED pixel pitch of the vertical edge splicing seam between the adjacent modules of the whole LED display unit corresponding to each strip position are obtained;

aiming at the vertical edge splicing seam of any pair of adjacent modules, the average value of all standard LED pixel intervals between the vertical edge starting point and the end point of the pair of adjacent modules is calculated to be the average standard interval of the pair of adjacent modules, and the average value of all splicing seam LED pixel intervals is the average splicing seam interval of the pair of adjacent modules; similarly, for the transverse edge seam splicing of any pair of adjacent modules, the calculated average value of all standard LED pixel distances between the transverse edge starting point and the transverse edge finishing point of the pair of adjacent modules is the average standard distance of the pair of adjacent modules, and the average value of all seam splicing LED pixel distances is the average seam splicing distance of the pair of adjacent modules.

The invention adopts a mode of staggered brightening of pixels on two sides of the optical gap, so that the optical gap is not a straight line any more but a zigzag broken line, the feeling of the gap is lightened, and black lines among the LED display module, the LED display module and the LED display box body can be eliminated more thoroughly by brightening.

Drawings

The invention is described in further detail below with reference to the figures and specific examples.

Fig. 1 is a schematic diagram of an interleaved optical gap correction according to embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of a double staggered optical gap correction according to embodiment 2 of the present invention.

Fig. 3 is a schematic view of an interlocking staggered optical gap correction according to embodiment 3 of the present invention.

Fig. 4 is a grid card diagram of the seams between the modules of the LED display box, wherein two rows of the upper side of each module, two columns of the left side of each module, one row of the lower side of each module, and one column of the right side of each module are lit, thereby forming a grid card including all the seams between the modules.

FIGS. 5a and 5b are schematic views showing the strip moving downward gradually; in the figure 1. camera field of view, 2. long strips, 3.LED pixels.

Fig. 6 is a schematic diagram of a column-average envelope of a long strip of a single LED display box, where the abscissa is the X-coordinate of a camera pixel and the ordinate is the luminance value of the camera pixel.

Fig. 7 is a schematic diagram of a set of consecutive 3 envelope peaks in a long stripe, where the abscissa is the X-coordinate of the camera pixel and the ordinate is the luminance value of the camera pixel.

Detailed Description

Example 1

The staggered optical gap correction method for the LED display units adopts a staggered brightening mode of odd and even rows (columns) of the LED display units to perform optical gap correction.

As shown in fig. 1, the vertical edge seams brighten the odd-numbered LED pixels only in the left column and the even-numbered LED pixels only in the right column; brightening the LED pixels in odd columns by one row at the upper side of the horizontal edge seam, and brightening the LED pixels in even columns by one row at the lower side; and multiplying the brightening LED pixel by the original correction coefficient by the brightening proportion to obtain a modified correction coefficient. And correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

In the embodiment, the vertical edge splicing seam can be adopted to brighten LED pixels in even lines in the left column and brighten LED pixels in odd lines in the right column; brightening LED pixels in even rows in the upper row and brightening LED pixels in odd rows in the lower row in the horizontal edge seam; and multiplying the brightening LED pixel by the original correction coefficient by the brightening proportion to obtain a modified correction coefficient. And correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

The staggered brightness enhancement makes the optical gap not be a straight line but a zigzag broken line, so that the feeling of the optical gap is weakened.

Example 2

The staggered optical gap correction method for the LED display unit adopts an odd-even row (column) double staggered brightening mode to perform optical gap correction.

As shown in FIG. 2, the vertical edge seams brighten only the double odd-numbered rows of pixels in the left column and the double even-numbered rows of pixels in the right column; the pixels in the double odd-numbered columns are only brightened in the upper row of the transverse edge seam, and the pixels in the double even-numbered columns are only brightened in the lower row of the transverse edge seam. And multiplying the brightening LED pixel by the original correction coefficient by the brightening proportion to obtain a modified correction coefficient. And correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

In the embodiment, the left column of the vertical edge seam can be used for brightening the LED pixels in the double even rows only, and the right column of the vertical edge seam can be used for brightening the LED pixels in the double odd rows only; the LED pixels in double even rows are only brightened in the upper row of the horizontal edge seam, and the LED pixels in double odd rows are only brightened in the lower row; and multiplying the brightening LED pixel by the original correction coefficient by the brightening proportion to obtain a modified correction coefficient. And correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

Thus, the double staggered brightness enhancement makes the optical gap not a straight line but an elongated zigzag fold line, thus weakening the perception of the optical gap.

Example 3

The staggered optical gap correction method for the LED display unit adopts a mode of interlocking, staggering and brightening the odd and even rows (columns) of the whole screen to perform optical gap correction.

As shown in FIG. 3, the left column of the vertical edge patchwork brightens only the 1 st, 2 nd, 3 rd, 5 th, 6 th, 7 th, 9 th, 10 th, 11 th, 13 th, 14 th, 15 th 15 … … th rows of pixels, leaving the 4 th, 8 th, 12 th, 16 … … th rows of pixels unlighted; the pixels of the 1 st, 3 rd, 4 th, 5 th, 7 th, 8 th, 9 th, 11 th, 12 th, 13 th, 15 th, 16 th 16 … … th lines are lightened in the right column of the vertical edge seam, and the pixels of the 2 th, 6 th, 10 th, 14 th and 14 … … th lines which are not lightened are left; only the 1 st, 2 nd, 3 rd, 5 th, 6 th, 7 th, 9 th, 10 th, 11 th, 13 th, 14 th, 15 th 15 … … th pixels are lightened in the upper row of the transverse edge joint, and the 4 th, 8 th, 12 th, 16 th 16 … … th pixels which are not lightened are left; the lower row of the transverse edge seam only brightens the pixels of the 1 st, 3 rd, 4 th, 5 th, 7 th, 8 th, 9 th, 11 th, 12 th, 13 th, 15 th and 16 th 16 … … th columns, and leaves the pixels of the 2 nd, 6 th, 10 th and 14 th 14 … … th columns without brightness; and multiplying the brightening LED pixel by the original correction coefficient by the brightening proportion to obtain a modified correction coefficient. And correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

In this embodiment, the left column of the vertical edge seam can be used to brighten the pixels of the 1 st, 3 rd, 4 th, 5 th, 7 th, 8 th, 9 th, 11 th, 12 th, 13 th, 15 th and 16 th 16 … … th rows; 2, 6, 10 and 14 … … rows of pixels which are not lightened are left, only 1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14 and 15 … … rows of pixels are lightened in the right column of the vertical edge seam, and 4, 8, 12 and 16 … … rows of pixels which are not lightened are left; only the 1 st, 3 rd, 4 th, 5 th, 7 th, 8 th, 9 th, 11 th, 12 th, 13 th, 15 th, 16 th 16 … … th pixels are lightened in the upper row of the transverse edge joint, and the 2 nd, 6 th, 10 th, 14 … … th pixels which are not lightened are left; the lower row of the transverse edge seam only brightens the pixels of the 1 st, 2 nd, 3 rd, 5 th, 6 th, 7 th, 9 th, 10 th, 11 th, 13 th, 14 th and 15 th 15 … … th columns, and leaves the pixels of the 4 th, 8 th, 12 th and 16 … … th columns without brightness; and multiplying the brightening LED pixel by the original correction coefficient by the brightening proportion to obtain a modified correction coefficient. And correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

The incremental ratio of the LED pixels in examples 1-3 is equal to the patched LED pixel pitch (i.e., the pitch between the LED pixels at the two side edges of the module patched) at the patched where the LED pixel is located, divided by the standard LED pixel pitch (i.e., the LED pixel pitch inside the module).

The incremental ratio of the LED pixels in embodiments 1-3 can also be equal to the average seam pitch at the vertical (or horizontal) seam of the module where the LED pixel is located, divided by the average standard pitch (i.e., the LED pixel pitch inside the module).

If the brightening proportion of vertical edge seams and transverse edge seams among modules in the display unit is repeatedly calculated, the later condition is the standard; for example, the brightness-corrected correction coefficient is obtained by multiplying the original correction coefficient by the brightening proportion of the vertical edge patchwork, and the brightness-corrected correction coefficient is obtained by multiplying the original correction coefficient by the brightening proportion of the horizontal edge patchwork, so that the correction coefficient finally loaded by the four LED pixels is the brightness-corrected correction coefficient obtained by multiplying the original correction coefficient by the brightening proportion of the horizontal edge patchwork.

The patchwork LED pixel pitch and the standard LED pixel pitch can be obtained by a conventional distance measurement method, and can also be obtained by the following method:

step one) as shown in fig. 4, lighting single primary color LED pixels centered in red, green and blue in two rows of the left inner side and one row of the right inner side LED cells of all modules of the LED display box body; because the red, green and blue tube cores are arranged linearly, the position of the LED pixel with the middle primary color can represent the accurate position of the LED wafer, and the positioning is more accurate; therefore, three rows of LED pixels are displayed at the vertical edge joints of all the modules, and the three rows of LED pixels comprise the standard LED pixel spacing at the vertical edge joints and the joint LED pixel spacing at the vertical edge joints.

Step two), holding a digital camera of any model, aligning the view-finding frame with the LED display box body, and adjusting a camera lens to enable the LED display box body to fill the whole view-finding frame for shooting to obtain a photo of the LED display box body.

Step three), because the photos are photos shot by the handheld camera, the inclination angles of the general photos are variable, and sometimes the inclination angles are large; in addition, the three-dimensional direction of the hand-held camera may not be well controlled, and the picture distortion may be large, which increases the difficulty of automatic picture recognition. The invention can automatically identify the large-inclination-angle photo with the angle of 0-20 degrees by adopting an envelope method.

The envelope method is as follows: assume that 4620 columns of camera pixels are contained within the camera field of view, as shown in FIG. 5 a; setting the length of the long strip as the width of the camera field of view (i.e. 4620 columns of camera pixels width), and the width D0 of the long strip as 50 rows of camera pixels (where the width D0 is not strictly limited, and is generally the number of rows of camera pixels in the camera field of view divided by the number of rows of LED pixels in the LED display box); intercepting the brightness data of the camera pixels in the long strip from the first row (the uppermost first row), calculating the average value of the brightness data of the camera pixels in 50 rows of each column, and forming an envelope by the average value of the brightness data of the camera pixels in each column in the long strip; if the peak values of all the envelope peaks are less than the gray level threshold H0, the long band is shifted down, as shown in fig. 5b, until the peak value of the envelope peak is greater than H0, 1/3 of the highest envelope peak is determined as H1 instead of H0, wherein the width H0 is not strictly limited, and is generally about 15% of the maximum possible brightness of the lit LED pixel; here, H0 is set to 40; the distance between adjacent envelope peaks, D1, was calculated, replacing D0 with D1 as the width of the new long band.

Step four), moving the long strip downwards, continuously intercepting the brightness data of the camera pixels in the long strip according to the new width D1 of the long strip, calculating the average value of the brightness data of each row of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each row of camera pixels in the long strip; omission of only a single envelope peak and only 2 envelope peaks in succession; when 3 continuous enveloping peaks appear, accurately calculating the accurate positions of the centers of the light spots of the corresponding three LED pixels according to the average value of the brightness data of each column of camera pixels at the enveloping peaks; the distance between 2 adjacent LED pixels can be calculated according to the accurate positions of the light spot centers of the three LED pixels, and the distance between the 1 st LED pixel and the 2 nd LED pixel is the splicing LED pixel distance at the vertical edge splicing part; the distance between the 2 nd LED pixel and the 3 rd LED pixel is the standard LED pixel distance at the vertical edge splicing seam.

Step five), continuously moving the long strip downwards, calculating the average value of the brightness data of each row of camera pixels in the long strip, and forming an envelope by the average value of the brightness data of each row of camera pixels, wherein as shown in fig. 6, for the LED display box spliced by the four modules, the complete envelope comprises 12 envelope peaks; as shown in fig. 7, the standard LED pixel pitch and the joint LED pixel pitch at the vertical edge joint corresponding to 3 envelope peaks can be calculated from the precise positions of the continuous 3 envelope peaks; and by analogy, the standard LED pixel spacing and the splicing seam LED pixel spacing at the vertical edge splicing seam between the adjacent modules of the whole LED display unit are obtained.

Similarly, the single primary color LED pixels in red, green and blue in two rows of the upper inner sides and one row of the lower inner sides of the LED wafers in all the modules of the LED display box body are lightened; and setting the length of the long strip as the height of a camera view field, setting the width D0 of the long strip as 50 rows of camera pixels, and obtaining the standard LED pixel spacing and the seam LED pixel spacing at the transverse edge seam between every two adjacent modules in the LED display unit according to the method of the second step to the fifth step.

The accurate position of the LED pixel spot center can be calculated by adopting the following two methods:

the method comprises the following steps: and regarding the part with the peak value larger than the threshold value H1 as a brightness envelope effective part, taking the brightness data average value of each column of camera pixels in the brightness envelope effective part as a weight to be multiplied by the X coordinate of the column of camera pixels to obtain the barycentric coordinate component of the column of camera pixels, then summing all barycentric coordinate components in the brightness envelope effective part, dividing the barycentric coordinate component of each column of camera pixels by the sum of all barycentric coordinate components respectively to obtain the X coordinate corresponding to the maximum value, namely the brightness barycenter, and taking the brightness barycenter as the center X coordinate of the LED pixel light spots of one column, thereby determining the accurate position of the LED pixels.

The second method comprises the following steps: regarding the part with the peak value larger than the threshold value H1 as the effective part of the envelope; and fitting the average value of the brightness data of all the lines of camera pixels in the effective part of the brightness envelope by a curve to obtain the X coordinate of the highest peak point of the envelope peak, wherein the X coordinate is used as the X coordinate of the centers of the LED pixel light spots in one line, and thus the accurate position of the LED pixel is determined.

The LED display unit can be an integral LED display screen or a single LED display box body. The whole screen building is completed on site, so the whole screen trimming is usually completed on site; for single LED display cases, the repair of the seams is typically done on-line or single-case repair.

When the LED display unit is a display screen, the LED pixels which display the serial number of the LED display box body are lighted in the two transverse modules at the center of each LED display box body: the left module displays column numbers and the right module displays row numbers; after the photo files of the LED display boxes are read, the positions of the LED display boxes corresponding to the photos in the display screen are determined according to the row numbers and the column numbers of the photos, and then the numbers are pinned. The pin number method is as follows: setting a pin number gray threshold H0' ═ 40; the gray scale of the LED pixels with gray scale values less than H0 ' in the display number region is kept unchanged, and the gray scale value of the LED pixels with gray scale values greater than H0 ' is changed to H0 '. The purpose of the pin number is to ensure that the mean value of the row number and the column number of the LED display box body is less than H₀', not interpreted as an LED pixel; h₀' typically takes around 15% of the maximum possible brightness of the illuminated LED pixel.

Claims

1. A staggered optical gap correction method for an LED display unit is characterized by comprising the following steps: brightening the LED pixels at two sides of the vertical edge seam and the transverse edge seam in a staggered mode, and multiplying the brightening proportion of the brightened LED pixels by the original correction coefficient to obtain a correction coefficient; and correcting the brightness of the LED pixels by using the correction coefficient to finish optical seam correction.

2. The staggered optical gap correction method for LED display units according to claim 1, wherein said vertical edge joints brighten LED pixels in odd rows only in the left column and LED pixels in even rows only in the right column; brightening the LED pixels in odd columns by one row at the upper side of the horizontal edge seam, and brightening the LED pixels in even columns by one row at the lower side; or the left column of the vertical edge is spliced to brighten the LED pixels in the even rows only, and the right column of the vertical edge is spliced to brighten the LED pixels in the odd rows only; and the upper row of the transverse edge seam only brightens even-numbered rows of LED pixels, and the lower row of the transverse edge seam only brightens odd-numbered rows of LED pixels.

3. The staggered optical gap correction method for LED display units according to claim 1, wherein said vertical edge seam tiles only double odd rows of pixels in a left column and only double even rows of pixels in a right column; only double odd-numbered row pixels are brightened in the upper row of the horizontal edge seam, and only double even-numbered row pixels are brightened in the lower row of the horizontal edge seam; or the left column of the vertical edge is spliced to brighten the LED pixels in the even rows, and the right column of the vertical edge is spliced to brighten the LED pixels in the odd rows; and the LED pixels in double even rows are only brightened in the upper row of the transverse edge seam, and the LED pixels in double odd rows are only brightened in the lower row of the transverse edge seam.

4. The staggered optical gap correction method for LED display units according to claim 1, wherein one column to the left of said vertical edge patchwork brightens only the pixels of the 3n +1, 3n +2, 3n +3 rows, where n is 0, 1, 2 … …; only the 3m-2, 3m and 3m +1 rows of pixels are brightened in the column on the right side of the vertical edge joint, wherein m is 1, 2 … …; only brightening the pixels of 3n +1, 3n +2 and 3n +3 columns in the upper row of the transverse edge joint, wherein n is 0, 1 and 2 … …; the lower row of the transverse edge joint only brightens the 3m-2, 3m and 3m +1 columns of pixels, wherein m is 1, 2 … …; or only brightening the 3m-2, 3m and 3m +1 row of pixels in a column on the left of the vertical edge seam, wherein m is 1, 2 … …; one column at the right of the vertical edge joint only brightens the pixels of the 3n +1, 3n +2 and 3n +3 rows, wherein n is 0, 1 and 2 … …; only the 3m-2, 3m and 3m +1 columns of pixels are brightened in a row at the upper edge of the transverse edge joint, wherein m is 1, 2 … …; and the pixels of 3n +1, 3n +2 and 3n +3 columns are only brightened in a row below the transverse edge joint, wherein n is 0, 1 and 2 … ….

5. The method of claim 1, wherein the incremental ratio is equal to the LED pixel pitch of the edge joint at the position of the LED pixel divided by the standard LED pixel pitch.

6. The staggered optical gap correction method for LED display units according to claim 5, wherein the patchwork LED pixel pitch and the standard LED pixel pitch are obtained by:

7. The method of claim 1, wherein the incremental ratio is equal to the average stitch pitch of the module stitch where the LED pixel is located divided by the average standard pitch.

8. The method of claim 7, wherein the average splice pitch divided by the average standard pitch is obtained by: