CN113257144A - Method for improving splicing brightness consistency among box bodies of LED display screen after single-box correction - Google Patents

Method for improving splicing brightness consistency among box bodies of LED display screen after single-box correction Download PDF

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CN113257144A
CN113257144A CN202110520640.5A CN202110520640A CN113257144A CN 113257144 A CN113257144 A CN 113257144A CN 202110520640 A CN202110520640 A CN 202110520640A CN 113257144 A CN113257144 A CN 113257144A
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brightness
red
box
temperature
blue
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CN113257144B (en
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苗静
郑喜凤
陆文文
曹慧
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Changchun Cedar Electronics Technology Co Ltd
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Changchun Cedar Electronics Technology Co Ltd
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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
    • G09F9/33—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 semiconductor devices, e.g. diodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Abstract

The invention relates to a method for improving the consistency of splicing brightness among boxes after single-box correction of an LED display screen, which comprises the steps of selecting one box from a certain batch of boxes, respectively measuring brightness values at different temperatures from just electrifying to a thermal balance state, and arranging the brightness values into a temperature compensation proportionality coefficient table; aiming at any other box body in the batch, firstly correcting to obtain an initial correction coefficient matrix, then measuring the brightness value at any temperature and searching a temperature compensation proportionality coefficient table to determine a brightness compensation proportionality coefficient; multiplying the brightness compensation proportion coefficient by the actually measured brightness value to obtain a brightness correction value; determining a final correction proportion according to the recommended brightness; multiplying the initial correction coefficient matrix by the final correction proportion to obtain a final correction coefficient of the box body; and the control system loads the final correction coefficient to finish the final correction of the box body. The invention does not need to strictly ensure that the temperature of each box body is the same, has low requirement on the environmental temperature, and saves the time cost for keeping the temperature of each box body to be the same.

Description

Method for improving splicing brightness consistency among box bodies of LED display screen after single-box correction
Technical Field
The invention belongs to the technical field of optical acquisition and correction of LED display screens, and relates to a method for improving the consistency of splicing brightness among boxes after single-box correction of an LED display screen.
Background
Due to the influence of the manufacturing process of the LED light-emitting chips, the difference of brightness and color exists between the light-emitting chips, and the LED light-emitting chips are required to be corrected after being assembled into a display screen. The current correction methods used in the industry are divided into two types: full screen correction and single bin correction. The single-box correction has the advantages that construction is not needed in a factory, the corrected box body can be exchanged at any position of a project site, the labor cost and the site resource cost for constructing a screen are greatly saved, and the single-box correction is suitable for the scene requirements of rental performance and the like which are constructed at any time. When the single box is used for correction, because each box body is used for independent correction, the temperature and the environment are difficult to be ensured to be all consistent when the single box is used for correction. This causes a difference in brightness, especially in the primary color red, in the full screen after the screen is built, and this difference is most noticeable because the red LED light emitting chip is particularly sensitive to temperature. If the temperature difference between the two boxes is above 2 ℃, the human eyes can see the brightness difference between the boxes.
Disclosure of Invention
The invention aims to provide a method for improving the consistency of the splicing brightness of single-box corrected LED display screens among box bodies. The method does not need to strictly ensure that the temperature of each box body is the same, has low requirement on the environmental temperature, and has good white field consistency between the box bodies and the screen of the box body after splicing.
The method for improving the consistency of the splicing brightness of the single box corrected LED display screen between the boxes comprises the following steps:
step one, aiming at boxes of a certain batch or project, selecting one box to display pure red with the gray level of Gr0＝1～2nN is less than or equal to 16; using a color brightness meter and a thermometer to respectively measure the red brightness values of the screen body of the box body at different temperatures from the state of just electrifying to the state of thermal equilibrium, and arranging the red brightness values into a red temperature compensation coefficient table Tr；
Figure BDA0003063819820000011
Wherein T isriIs the temperature of the screen body
Figure BDA0003063819820000012
Corresponding red luminance compensation scale factor, Lr1The brightness of red screen body at the moment of power-on, LriIs the temperature of the screen body
Figure BDA0003063819820000021
The corresponding red brightness;
step two, aiming at any other box body of the batch or the project, correcting the box body to make the internal brightness of the box body consistent after correction, and obtaining a red initial correction coefficient matrix R of the box body through correction; loading red correction coefficient, displaying pure red in the box body and G in gray scaler1＝1～2nN is less than or equal to 16; measuring the temperature of any screen
Figure BDA0003063819820000027
Lower red luminance value Lr_j(ii) a According to the temperature of the screen
Figure BDA0003063819820000028
Looking up the red temperature compensation proportionality coefficient table to determine the red brightness compensation proportionality coefficient Trj(ii) a Compensation of the scaling factor T by the red luminancerjMultiplied by the measured red luminance value Lr_jObtaining a red brightness correction value of the box body; l isrj’＝Lr_j×Trj(ii) a Wherein G isr1May or may not be equal to Gr0(ii) a Determining a red final correction ratio according to the recommended red brightness TargetR, wherein the ratio R is TargetR/Lrj'; multiplying the red initial correction coefficient matrix R by the red final correction proportion ratio R to obtain a box red final correction coefficient FR; loading a red final correction coefficient FR by the control system to finish the final correction of the box body;
and step three, repeating the step two until the correction of all other boxes of the batch or project is completed.
Further, in the second step, a green initial correction coefficient matrix G of the box body can be obtained by correcting the box body.
Further, in the second step, the control system loads the green initial correction coefficient matrix G at the same time.
Further, in the first step, the box body can display pure green at room temperature, and the gray scale is Gg0＝1～2nN is less than or equal to 16; using a color brightness meter and a thermometer to respectively measure the green brightness values of the screen body of the box body at different temperatures from the state of just electrifying to the state of thermal equilibrium, and arranging the green brightness values into a green temperature compensation coefficient table Tg；
Figure BDA0003063819820000022
Wherein T isgiIs the temperature of the screen body
Figure BDA0003063819820000023
Corresponding green luminance compensation scale factor, Lg1Green brightness of screen body at the moment of power-on, LgiIs the temperature of the screen body
Figure BDA0003063819820000024
A corresponding green brightness;
in the second step, a green correction coefficient is loaded, the box body displays pure green, and the gray level is Gg1＝1～2nN is less than or equal to 16; measuring the temperature of any screen
Figure BDA0003063819820000025
Lower green luminance value Lg_j(ii) a According to the temperature of the screen
Figure BDA0003063819820000026
Looking up the green temperature compensation proportionality coefficient table to determine the green brightness compensation proportionality coefficient Tgj(ii) a Compensating the scaling factor T by the green luminancegjMultiplied by the measured green luminance value Lg_jObtaining a green brightness correction value of the box body; l isgj’＝Lg_j×Tgj；Gg1May or may not be equal to Gg0(ii) a Determining the final green correction proportion according to the recommended green brightness TargetGratioG，ratioG＝TargetG/Lgj'; and multiplying the green initial correction coefficient matrix G by the green final correction proportion ratio G to obtain a green final correction coefficient FG of the box body.
Further, in the second step, a blue initial correction coefficient matrix B of the box body can be obtained through the correction box body.
Further, the control system loads the blue initial correction coefficient matrix B simultaneously in the second step.
Further, in the first step, the box body can display pure blue at room temperature, and the gray scale is Gb0＝1～2nN is less than or equal to 16; respectively measuring the blue brightness values of the screen body of the box body at different temperatures from the just-powered on state to the thermal equilibrium state by using a color brightness meter and a thermometer, and arranging the blue brightness values into a blue temperature compensation coefficient table Tb；
Figure BDA0003063819820000031
Wherein T isbiIs the temperature of the screen body
Figure BDA0003063819820000032
Corresponding blue luminance compensation scale factor, Lb1The blue brightness of the screen body at the moment of power-on, LbiTo screen body temperature TiA corresponding blue luminance;
in the second step, a blue correction coefficient is loaded, the box body displays pure blue, and the gray level is Gb1＝1～2nN is less than or equal to 16; measuring the temperature of any screen
Figure BDA0003063819820000033
Blue luminance value Lb_j(ii) a According to the temperature of the screen
Figure BDA0003063819820000034
Looking up the blue temperature compensation proportionality coefficient table to determine the blue brightness compensation proportionality coefficient Tbj(ii) a Compensation of the scaling factor T with blue luminancebjMultiplied by the measured blue luminance value Lb_jTo obtain the boxA blue luminance correction value of the volume; l isbj’＝Lb_j×Tbj；Gb1May or may not be equal to Gb0(ii) a Determining a blue final correction ratio, ratio B, according to the recommended blue brightness, targetB/Lbj'; and multiplying the blue initial correction coefficient matrix B by the blue final correction ratio B to obtain a box blue final correction coefficient FB.
In consideration of safe current, the recommended red brightness TargetR, the recommended green brightness TargetG and the recommended blue brightness TargetB of the box body are respectively set to be 50% -80% of the maximum brightness of red, green and blue, so that the ratio of red, green and blue to ratio R, ratio G and ratio B are all smaller than 1, all the box bodies can be guaranteed to reach the recommended brightness, and the situation that the brightness is improved to exceed the maximum brightness does not exist.
The temperature compensation coefficient table is established by monitoring the temperature and the brightness of any box body in each batch or project; and aiming at other boxes in the batch or project, correcting the brightness of each box by searching a temperature compensation coefficient table, thereby ensuring the white field consistency between the LED display screen boxes spliced by the boxes in the batch or project. The method does not need to strictly ensure that the temperature of each box body is the same, has low requirement on the environmental temperature, and saves the time cost for keeping the temperature of each box body to be the same.
The invention is simple, effective and easy to implement, can ensure the brightness of the display screen measured at different temperatures at the same temperature through a temperature measuring device with high sensitivity, can ensure that single boxes with different temperatures at different time periods have the same brightness after the single boxes are corrected, and can greatly reduce the problem of color inconsistency caused by red attenuation. The white field consistency effect after the splicing of the display screen is effectively improved. And the correction test of each box body at the same environmental temperature is not required to be strictly ensured, the capital cost and the time cost for controlling the environment are effectively saved, and the production efficiency is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a graph of red luminance versus temperature.
FIG. 3 is a schematic diagram of a single-box calibration structure (calibration structure + temperature measurement structure).
In the figure: 1. a box body; 2. a liftable temperature measuring instrument; 3. a color luminance meter; 4. a collecting device for correction; 5. and a controller.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, it being understood that the specific embodiments described herein are illustrative of the invention only and are not limiting. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meanings of the above terms in the present invention can be specifically understood in specific cases by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," or "beneath" a second feature includes the first feature being directly under or obliquely below the second feature, or simply means that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The present invention will be described in detail below with an example of the highest gray level of the display screen being 255.
As shown in fig. 1, the method for improving the uniformity of the splicing brightness between the corrected single-box bodies of the LED display screen of the present invention specifically comprises the following steps:
step one, randomly selecting one box from boxes in a batch or a project, displaying pure red (255,0,0) when the box is electrified, and respectively measuring the temperature of the screen body of the box when the screen body is electrified by using a thermometer and a color luminance meter
Figure BDA0003063819820000051
And a red luminance Lr1Recording screen body temperature
Figure BDA0003063819820000052
And a red luminance Lr1Testing the red brightness of the screen body when the temperature of the screen body rises by 0.5 ℃ every time, and recording the temperature t of the test screen body when the temperature t does not rise again until reaching the thermal equilibrium temperaturernAnd a red luminance Lrn. Arranging into a red temperature compensation coefficient table T according to the screen body temperature and the red brightness measured each timer。
Figure BDA0003063819820000053
Wherein T isriIs the temperature of the screen body
Figure BDA00030638198200000512
Corresponding red luminance compensation scale factor, Lr1The brightness of red screen body at the moment of power-on, LriIs the temperature of the screen body
Figure BDA00030638198200000513
Corresponding red luminance.
The power failure of the box body is at least 30 minutes, the box body displays pure green (0,255,0) when the temperature of the screen body is recovered to the room temperature, and the temperature of the screen body is tested
Figure BDA0003063819820000054
And green luminance Lg1Recording screen body temperature
Figure BDA0003063819820000055
And green luminance Lg1Testing the green brightness of the screen body when the temperature of the screen body rises by 0.5 ℃, and recording the temperature of the screen body until the temperature reaches the thermal equilibrium temperature and does not rise any more
Figure BDA0003063819820000056
And green luminance Lgn. Arranging a green temperature compensation coefficient table T according to the screen body temperature and the green brightness measured each timeg。
Wherein
Figure BDA0003063819820000057
The box body is powered off for at least more than 30 minutes, and the temperature of the screen body is displayed in pure blue (0, 255) when the screen body is restored to the room temperature
Figure BDA0003063819820000058
And a blue luminance Lb1Recording screen body temperature
Figure BDA0003063819820000059
And a blue luminance Lb1Testing blue brightness when the temperature of the screen body rises by 0.5 ℃ every time and recording the temperature of the screen body to be tested when the temperature of the screen body reaches the thermal balance and does not rise any more
Figure BDA00030638198200000510
And a blue luminance Lbn. Arranging a blue temperature compensation coefficient table T according to the screen body temperature and the blue brightness measured each timeb。
Wherein
Figure BDA00030638198200000511
The red, green, and blue temperature compensation coefficient tables are now available for the batch or for the bins of the project, and may be used for each bin of the batch or project.
And step two, aiming at any other box body of the batch or project, correcting the box body to ensure that the brightness consistency in the corrected box body is good and the whole box is flat. Here, a three-primary color initial correction coefficient matrix W of the box is obtained. W ═ R G B]R, G, B are the initial calibration coefficient matrixes of red, green and blue, respectively. Loading initial correction coefficients of red, green and blue, displaying pure red (255,0,0) by the box body, and measuring the temperature of any screen body
Figure BDA0003063819820000064
Lower red luminance value Lr_j(ii) a The box body displays pure green (0,255,0), and the temperature of any screen body is measured
Figure BDA0003063819820000063
Lower green luminance value Lg_j(ii) a The box body displays pure blue (0, 255), and the temperature of any screen body is measured
Figure BDA0003063819820000062
Blue luminance value Lb_j；
The temperature of the screen body is measured when different primary colors are displayed according to the box body respectively
Figure BDA0003063819820000061
Respectively searching the temperature compensation proportional coefficient tables of red, green and blue colors, respectively determining the temperature compensation proportional coefficients of the three primary colors of red, green and blue, and recording the temperature compensation proportional coefficients as Trj，Tgj，Tbj. By Trj，Tgj，TbjRespectively multiplied by the actually measured red brightness value Lr_j、Lg_j、Lb_jRespectively obtaining the brightness correction values L of the red, green and blue three primary colors of the box body when the box body is just electrifiedrj’、Lgj’、Lbj’。Lrj’＝Lr_j×Trj，Lgj’＝Lg_j×Tgj，Lbj’＝Lb_j×Tbj；
Respectively determining the final correction proportions of ratio R, ratio G and ratio B of the three primary colors of red, green and blue according to the recommended red, green and blue brightness TargetR, TargetG and TargetB; the recommended red brightness TargetR, the recommended green brightness TargetG and the recommended blue brightness TargetB of the box body are respectively set to be 50% -80% of the maximum brightness of red, green and blue;
wherein ratio R is TargetR/Lrj’，ratioG＝TargetG/Lgj’，ratioB＝TargetB/Lbj’；
Multiplying the initial correction coefficient matrixes of the three primary colors of red, green and blue by the final correction proportion of the three primary colors of red, green and blue respectively to obtain a box body final correction coefficient matrix FW ═ FR FGFB ], wherein:
FR＝R×ratioR
FG＝G×ratioG
FB＝B×ratioB
and the control system loads a final correction coefficient matrix FW, and the box body is finally corrected.
And step three, repeating the step two until the correction of all other boxes of the batch or project is completed.
The method for testing the temperature of the screen body can ensure that the box bodies corrected under different temperature conditions have the brightness without brightness attenuation when the box bodies are electrified (namely the temperature is consistent), namely: the influence of inconsistent brightness caused by different correction temperatures of single boxes in different time periods is eliminated. And then the brightness correction in the second step can ensure that the box bodies with different temperatures in different time periods have the same brightness after correction, so that the problem of color inconsistency caused by red attenuation can be greatly reduced. The white field consistency effect after the display screen is spliced is effectively improved.
The display control of the box body, and the storage and the processing of the temperature and brightness data are all finished by the controller.
The present invention is not limited to the above embodiments, and the maximum gray scale is preferably, but not limited to, when the housing displays three primary colors, and may be within the gray scale range. When calibrating the temperature compensation coefficient table, the temperature and brightness of the screen body are not limited to be tested once every 0.5 degree rise.

Claims (10)

1. A method for improving the consistency of splicing brightness among box bodies of an LED display screen after single-box correction is characterized by comprising the following steps:
step one, aiming at boxes of a certain batch or project, selecting one box to display pure red with the gray level of Gr0＝1～2nN is less than or equal to 16; using a color brightness meter and a thermometer to respectively measure the red brightness values of the screen body of the box body at different temperatures from the state of just electrifying to the state of thermal equilibrium, and arranging the red brightness values into a red temperature compensation coefficient table Tr；
Figure FDA0003063819810000011
Wherein T isriIs the temperature of the screen body
Figure FDA0003063819810000012
Corresponding red luminance compensation scale factor, Lr1The brightness of red screen body at the moment of power-on, LriIs the temperature of the screen body
Figure FDA0003063819810000013
The corresponding red brightness;
step two, aiming at any other box body of the batch or the project, correcting the box body to make the internal brightness of the box body consistent after correction, and obtaining a red initial correction coefficient matrix R of the box body through correction; loading red correction coefficient, displaying pure red in the box body and G in gray scaler1＝1～2nN is less than or equal to 16; measuring the temperature of any screen
Figure FDA0003063819810000014
Lower red luminance value Lr_j(ii) a According to the temperature of the screen
Figure FDA0003063819810000015
Looking up the red temperature compensation proportionality coefficient table to determine the red brightness compensation proportionality coefficient Trj(ii) a Compensation of the scaling factor T by the red luminancerjMultiplied by the measured red luminance value Lr_jObtaining a red brightness correction value of the box body; l isrj’＝Lr_j×Trj(ii) a Determining a red final correction ratio according to the recommended red brightness TargetR, wherein the ratio R is TargetR/Lrj'; multiplying the red initial correction coefficient matrix R by the red final correction proportion ratio R to obtain a box red final correction coefficient FR; loading a red final correction coefficient FR by the control system to finish the final correction of the box body;
and step three, repeating the step two until the correction of all other boxes of the batch or project is completed.
2. The method for improving the uniformity of the splicing brightness among the corrected single-box boxes of the LED display screen according to claim 1, wherein the recommended red brightness TargetR of the boxes is set to be 50% -80% of the maximum red brightness.
3. The method for improving the uniformity of the splicing brightness among the corrected single-box boxes of the LED display screen according to claim 1, wherein in the second step, a green initial correction coefficient matrix G of the box bodies is obtained by correcting the box bodies.
4. The method for improving the uniformity of the splicing brightness among the corrected single-box boxes of the LED display screen according to claim 3, wherein in the second step, the control system loads a green initial correction coefficient matrix G at the same time.
5. The method for improving the uniformity of the splicing brightness of the LED display screen between the corrected single-box bodies according to claim 4, wherein in the first step, the box bodies still display pure green at room temperature, and the gray scale is Gg0＝1～2n，n≤16; using a color brightness meter and a thermometer to respectively measure the green brightness values of the screen body of the box body at different temperatures from the state of just electrifying to the state of thermal equilibrium, and arranging the green brightness values into a green temperature compensation coefficient table Tg；
Figure FDA0003063819810000021
Wherein T isgiIs the temperature of the screen body
Figure FDA0003063819810000022
Corresponding green luminance compensation scale factor, Lg1Green brightness of screen body at the moment of power-on, LgiIs the temperature of the screen body
Figure FDA0003063819810000023
A corresponding green brightness;
in the second step, a green correction coefficient is loaded, the box body displays pure green, and the gray level is Gg1＝1～2nN is less than or equal to 16; measuring the temperature of any screen
Figure FDA0003063819810000024
Lower green luminance value Lg_j(ii) a According to the temperature of the screen
Figure FDA0003063819810000025
Looking up the green temperature compensation proportionality coefficient table to determine the green brightness compensation proportionality coefficient Tgj(ii) a Compensating the scaling factor T by the green luminancegjMultiplied by the measured green luminance value Lg_jObtaining a green brightness correction value of the box body; l isgj’＝Lg_j×Tgj(ii) a Determining a green final correction ratio (ratio G) according to the recommended green brightness (targetG), wherein the ratio G is targetG/Lgj'; and multiplying the green initial correction coefficient matrix G by the green final correction proportion ratio G to obtain a green final correction coefficient FG of the box body.
6. The method for improving the uniformity of the splicing brightness among the corrected single-box LED display screens according to claim 5, wherein the recommended green brightness TargetG of the box body is set to be 50% -80% of the maximum green brightness.
7. The method for improving the uniformity of the splicing brightness among the corrected single-box boxes of the LED display screen according to claim 1, wherein in the second step, a blue initial correction coefficient matrix B of the box body is obtained by correcting the box body.
8. The method for improving the uniformity of the splicing brightness among the corrected single-box boxes of the LED display screen according to claim 7, wherein in the second step, the control system loads the initial blue correction coefficient matrix B at the same time.
9. The method for improving the uniformity of the splicing brightness of the LED display screen between the corrected single box bodies as claimed in claim 8, wherein in the first step, the box bodies still display pure blue at room temperature, and the gray scale is Gb0＝1～2nN is less than or equal to 16; respectively measuring the blue brightness values of the screen body of the box body at different temperatures from the just-powered on state to the thermal equilibrium state by using a color brightness meter and a thermometer, and arranging the blue brightness values into a blue temperature compensation coefficient table Tb；
Figure FDA0003063819810000026
Wherein T isbiIs the temperature of the screen body
Figure FDA0003063819810000027
Corresponding blue luminance compensation scale factor, Lb1The blue brightness of the screen body at the moment of power-on, LbiTo screen body temperature TiA corresponding blue luminance;
in the second step, a blue correction coefficient is loaded, the box body displays pure blue, and the gray level is Gb1＝1～2nN is less than or equal to 16; measuring the temperature of any screen
Figure FDA0003063819810000031
Blue luminance value Lb_j(ii) a According to the temperature of the screen
Figure FDA0003063819810000032
Looking up the blue temperature compensation proportionality coefficient table to determine the blue brightness compensation proportionality coefficient Tbj(ii) a Compensation of the scaling factor T with blue luminancebjMultiplied by the measured blue luminance value Lb_jObtaining a blue brightness correction value of the box body; l isbj’＝Lb_j×Tbj(ii) a Determining a blue final correction ratio, ratio B, according to the recommended blue brightness, targetB/Lbj'; and multiplying the blue initial correction coefficient matrix B by the blue final correction ratio B to obtain a box blue final correction coefficient FB.
10. The method for improving the uniformity of the splicing brightness among the corrected single-box LED display screens according to claim 9, wherein the recommended blue brightness TargetB of the box body is set to be 50% -80% of the maximum blue brightness.
CN202110520640.5A 2021-05-13 2021-05-13 Method for improving splicing brightness consistency among box bodies of LED display screen after single-box correction Active CN113257144B (en)

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