CN114067731B - Low gray scale correction method and device for LED display screen and brightness correction system - Google Patents

Low gray scale correction method and device for LED display screen and brightness correction system Download PDF

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CN114067731B
CN114067731B CN202111425229.6A CN202111425229A CN114067731B CN 114067731 B CN114067731 B CN 114067731B CN 202111425229 A CN202111425229 A CN 202111425229A CN 114067731 B CN114067731 B CN 114067731B
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value
brightness
display screen
gray scale
led display
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CN114067731A (en
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何志民
王利文
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Colorlight Cloud Technology Co Ltd
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Colorlight Cloud Technology Co Ltd
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    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention relates to the technical field of LED display screen correction, and particularly discloses a low gray scale correction method, a low gray scale correction device and a brightness correction system for an LED display screen, wherein the method comprises the following steps: in turn, the components are arranged in sequenceAcquiring a preset gray scale set value n and LED display screen brightness data below each gray scale smaller than the gray scale set value n, wherein each lamp point of the LED display screen in the LED display screen brightness data corresponds to n display brightness values; selecting a display brightness value P corresponding to a gray level value i and a gray level value i +1 from n display brightness values corresponding to the lamp points to be corrected i And display luminance value P i+1 (ii) a By displaying the brightness value P i And display luminance value P i+1 Setting a target brightness value; calculating strategy through preset brightness compensation value, target brightness value and display brightness value P i+1 Display brightness value P i And calculating a brightness compensation value b of the lamp point to be corrected according to the gray scale set value n and the gray scale value i. The invention realizes effective correction of brightness values under all gray scales and meets the display requirements of people on the LED display screen.

Description

Low gray scale correction method and device for LED display screen and brightness correction system
Technical Field
The invention relates to the technical field of LED display screen correction, in particular to a low gray scale correction method and device for an LED display screen and a brightness correction system.
Background
The LED display screen is composed of a large number of luminous LED lamps, and the consistency of brightness and chromaticity is difficult to control in the production and manufacturing processes of the LED lamps, so that the phenomenon of uneven color and brightness can occur in the production and use processes of the LED display screen. As the service life of the LED display screen is prolonged, the performance of the LED display screen is changed continuously, and the visual effect of the LED display screen is poor. In addition, in the process of use and maintenance, the fault module needs to be replaced, and the phenomenon of inconsistent color and brightness of the display screen can occur due to the fact that the brightness and the chromaticity of the LED lamps in different batches are greatly different.
Many companies in China propose a scheme for correcting brightness point by point to solve the problem, however, the existing correction schemes calculate a brightness correction coefficient by a certain method, and then calculate a corrected brightness value by multiplying the brightness correction coefficient by a display brightness value. However, because the gray brightness of the low gray scale is low, the brightness of the 1 st-order white is only 0.2nit, the monochrome brightness is lower, and the correction cannot be performed, and the correction by the above method hardly improves the low gray scale, and even mosaic phenomenon occurs during display, the correction effect of the low gray scale is worse than that before correction, and the normal display requirement cannot be satisfied.
Therefore, there is a need to find a new technical solution to solve the above problems.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a low gray scale correction method and device for an LED display screen and a brightness correction system.
The invention comprises a low gray scale correction method for an LED display screen, which comprises the following steps:
sequentially acquiring a preset gray scale set value n and LED display screen brightness data below each gray scale smaller than the gray scale set value n, wherein each lamp point of the LED display screen in the LED display screen brightness data corresponds to n display brightness values;
selecting a display brightness value P corresponding to a gray level value i and a gray level value i +1 from n display brightness values corresponding to the lamp points to be corrected i And display luminance value P i+1 (ii) a Wherein i is less than or equal to n-1;
by displaying the brightness value P i And display luminance value P i+1 Setting a target brightness value;
calculating strategy through preset brightness compensation value, target brightness value and display brightness value P i+1 And a display luminance value P i And gray scale set value n and gray scale value i, calculating brightness compensation value b of the lamp point to be corrected;
wherein, the calculation strategy of the brightness compensation value is as follows:
luminance compensation value b ═ target luminance value-display luminance value P i ) /(display luminance value P i+1 -display luminance value P i )+i]/n。
Further, the value of the gray scale setting value n under 256 levels of gray scales is: n is more than or equal to 1 and less than or equal to 7.
Further, by displaying the luminance value P i And display luminance value P i+1 Setting the target brightness value as: p i The target brightness value is less than or equal to P i+1 。
Further, by displaying the luminance value P i And display luminance value P i+1 Setting the target brightness value as: 0.9. multidot. P i+1 The target brightness value is less than or equal to P i+1 。
Further, by displaying the luminance value P i And display luminance value P i+1 Setting the target brightness value as: target luminance value ═ P i +P i+1 )/2。
The invention also comprises a method for correcting the brightness of the LED display screen, which comprises the following steps:
acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen;
acquiring image display data of an LED display screen;
calculating the brightness correction value of the corresponding lamp point according to a preset brightness correction value calculation strategy, a brightness compensation value b and image display data;
sending the brightness correction values corresponding to all the lamp points to a receiving card;
wherein, the brightness correction value calculation strategy is as follows:
the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data.
The invention also comprises a low gray scale correction device of the LED display screen, wherein the low gray scale correction device comprises an LED display screen brightness data acquisition module, a target brightness value setting module and a brightness compensation value calculation module, wherein:
the LED display screen brightness data acquisition module is connected with the target brightness value setting module and is used for sequentially acquiring preset gray scale setting values n and LED display screen brightness data below each gray scale smaller than the gray scale setting values n, and each lamp point of the LED display screen in the LED display screen brightness data corresponds to n display brightness values;
a target brightness value setting module connected with the LED display screen brightness data acquisition module and the brightness compensation value calculation module, wherein the target brightness value setting module is used for setting the brightness value of the LED display screen at the corresponding lamp point to be correctedSelecting a display brightness value P corresponding to a gray level value i and a gray level value i +1 from the n display brightness values i And display luminance value P i+1 (ii) a Wherein i is less than or equal to n-1; and by displaying the luminance value P i And display luminance value P i+1 Setting a target brightness value;
a brightness compensation value calculating module connected with the target brightness value setting module for calculating strategy, target brightness value and display brightness value P according to preset brightness compensation value i+1 Display brightness value P i And gray scale set value n and gray scale value i, calculating brightness compensation value b of the lamp point to be corrected; the luminance compensation value calculation strategy is as follows: luminance compensation value b ═ target luminance value-display luminance value P i ) /(display luminance value P i+1 -display luminance value P i )+i]/n。
The invention also comprises a brightness correction device of the LED display screen, wherein the brightness correction device comprises a brightness compensation value acquisition module, an image display data acquisition module, a brightness correction value calculation module and a brightness correction value issuing module, wherein:
the brightness compensation value acquisition module is connected with the brightness correction value calculation module and is used for acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen;
the image display data acquisition module is connected with the brightness correction value calculation module and is used for acquiring image display data of the LED display screen;
the brightness correction value calculation module is connected with the brightness compensation value acquisition module, the image display data acquisition module and the brightness correction value issuing module and is used for calculating the brightness correction value corresponding to the lamp point according to a preset brightness correction value calculation strategy, the brightness compensation value b and the image display data; the luminance correction value calculation strategy is: the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data;
and the brightness correction value issuing module is connected with the brightness correction value calculating module and is used for issuing the brightness correction values corresponding to all the lamp points to the receiving card.
The invention also comprises a brightness correction system of the LED display screen, wherein the brightness correction system comprises the low gray scale correction device, the brightness correction device, a receiving card, the LED display screen and a camera, wherein:
the camera is connected with the low-gray-scale correction device and is used for sequentially shooting a preset gray-scale set value n and LED display screen brightness data below each gray scale smaller than the gray-scale set value n;
the low gray scale correction device is connected with the camera and the brightness correction device and used for acquiring brightness data of the LED display screen, and each lamp point of the LED display screen in the brightness data of the LED display screen corresponds to n display brightness values; and a brightness compensation value b used for calculating the lamp point to be corrected;
the brightness correction device is connected with the low gray scale correction device and the receiving card and is used for acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen; acquiring image display data of the LED display screen; calculating the brightness correction value of the corresponding lamp point through a preset brightness correction value calculation strategy, a brightness compensation value b and image display data; the luminance correction value calculation strategy is: the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data; then the brightness correction values corresponding to all the lamp points are issued to a receiving card;
the receiving card is connected with the brightness correction device and the LED display screen and used for receiving the brightness correction value and sending the brightness correction value to the LED display screen;
and the LED display screen is connected with the receiving card and is used for displaying under a preset gray scale set value n and each gray scale smaller than the gray scale set value n in sequence and displaying according to the brightness correction value.
Further, the camera is a CCM camera.
The invention discloses a low gray scale correction method, a device and a brightness correction system of an LED display screen, which are characterized in that firstly, a preset gray scale set value n and LED display screen brightness data under each gray scale smaller than the gray scale set value n are obtained in sequence, setting a target brightness value according to the display brightness value Pi and the display brightness value Pi +1 corresponding to the selected gray level value i and the gray level value i +1, calculating the brightness compensation value of the lamp point to be corrected through a preset brightness compensation value calculation strategy, when the target brightness value and the gray-scale setting value are constant values, the brightness compensation value obtained under the low brightness condition is larger than the brightness compensation value obtained under the slightly high brightness condition, so that when the brightness of the low gray-scale lamp point is compensated, the compensation effect on the lamp points with lower brightness is more obvious, while the compensation effect on the lamp points with higher brightness is relatively general, so that the problem that the low gray scale correction in the prior art is not improved is solved; on the other hand, after the brightness compensation value is obtained, the corresponding brightness correction value is calculated for each lamp point through the brightness correction value calculation strategy, the correction coefficient mainly plays a role in correcting high brightness, and the brightness compensation value mainly plays a role in correcting low brightness, so that the effective correction of the brightness values under all gray scales is realized, and the display requirement of people on the LED display screen is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart illustrating steps of a low gray scale correction method for an LED display screen according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a value of a target brightness value of an LED display screen by a low gray scale correction method according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating steps of a method for calibrating brightness of an LED display screen according to an embodiment of the present invention;
FIG. 4 is a structural composition diagram of a low gray scale correction apparatus for an LED display screen according to an embodiment of the present invention;
FIG. 5 is a structural diagram of an LED display screen brightness correction apparatus according to an embodiment of the present invention;
fig. 6 is a structural composition diagram of a brightness correction system of an LED display screen according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The low gray scale correction method for the LED display screen, disclosed by the embodiment of the invention, as shown in FIG. 1, comprises the following steps:
step S101: the method comprises the steps of sequentially obtaining a preset gray scale set value n and LED display screen brightness data below each gray scale smaller than the gray scale set value n, wherein each lamp point of an LED display screen in the LED display screen brightness data corresponds to n display brightness values.
The brightness data of the LED display screen of the embodiment can be obtained by shooting the LED display screen by a camera, and the shot LED display screen is displayed under a preset gray scale setting value n and is displayed under each gray scale smaller than the gray scale setting value n. The embodiment of the invention mainly corrects the low gray scale, so the value of n is relatively small, for example, the value of the gray scale setting value n under 256 gray scales is as follows: n is more than or equal to 1 and less than or equal to 7, and the value range of n should be expanded under the condition of expanding 256-level gray scales. For example, the gamma table is adopted to expand 256 levels of gray scales by 32 times to 8192 levels of gray scales, the gray scale range is 0-8191, the value range of n can be set to be 1-224, and the value range of n can be set to be 1-16384 levels of gray scales, the gray scale range is 0-16383, and the value range of n can be set to be 1-448. The skilled person can also set the gray-scale setting value n to be relatively large or small according to the present example and the specific case.
Each lamp point on the LED display screen has n display brightness values, via step S101. Assuming that n is 3, each lamp point on the LED display screen has a 1-order display brightness value, a 2-order display brightness value, and a 3-order display brightness value.
Step S102: selecting a display brightness value P corresponding to a gray level value i and a gray level value i +1 from n display brightness values corresponding to the lamp points to be corrected i And display luminance value P i+1 (ii) a Wherein i is less than or equal to n-1.
Each lamp point on the LED display screen has n display brightness values, so when a gray level value i and a gray level value i +1 are selected from the n display brightness values, the gray level i +1 is less than or equal to n, and the value range of i is as follows: i is less than or equal to n-1.
In this step, for example, when the lamp point a has n equal to 3, the display luminance value P corresponding to the gray scale 1 is obtained 1 10, gray level 2 corresponds to the display luminance value P 2 Display luminance value P corresponding to gray level 3 of 20 3 30; if n is 7 for the same lamp point, the display luminance value P corresponding to gray level 1 is obtained 1 10, gray level 2 corresponds to a display luminance value P 2 Display luminance value P corresponding to gray level 3 of 20 3 30, the display luminance value P corresponding to gray level 4 4 Display luminance value P corresponding to gray level 5 of 40 5 Display luminance value P corresponding to gray 6 of 50 6 60, gray level 7 corresponds to a display luminance value P 7 60. For lamp point B, when n is 3, the display brightness value P corresponding to gray scale 1 1 Display luminance value P corresponding to gray level 2 of 20 2 30, gray level 3 corresponds to the display luminance value P 3 40. In this step, only the gray level value i, the gray level value i +1, and the corresponding display brightness value P are selected from the known values in step S101 i And display luminance value P i+1 And (4) finishing.
Step S103: by displaying the brightness value P i And display luminance value P i+1 A target brightness value is set.
Assuming that i is selected to be equal to 2 by step S102, i +1 is equal to 3, and the luminance value P is displayed i Equal to 20, exhibits a brightness value P i+1 Equal to 30, the present embodiment can set the target brightness value in two ways:
the first method comprises the following steps: according to personal display requirements;
since the gray brightness requirements of different users for the display are different (of each LED display screen)The graying brightness may be different), so the target brightness value may be set according to the individual display requirement, specifically: p i The target brightness value is less than or equal to P i+1 When displaying the brightness value P i Equal to 20, display luminance value P i+1 When the target brightness value is equal to 30, the minimum value can be set to 20, the maximum value can be set to 30, and the target brightness value can also be set to an integer or decimal between 20 and 30.
As shown in FIG. 2, Target is represented as a Target luminance value, abscissa may be represented as a display luminance value, ordinate is represented as a gray-scale value, and length B1 represents P i+1 Length A2 denotes P i The length A1+ A2 represents the target brightness value, and A1+ A2 ≦ B1.
And the second method comprises the following steps: after the display brightness values are arranged from high to low, the values are taken in proportion;
for example: the value range of the target brightness value is as follows: 0.9. multidot. P i+1 The target brightness value is less than or equal to P i+1 。
To display the brightness value P i Equal to 20, display luminance value P i+1 Equal to 30 as an example, the value range of the target brightness value is: the target brightness value is more than or equal to 27 and less than or equal to 30. The value range of the target brightness value can be set as follows: 0.95P i+1 The target brightness value is less than or equal to 0.97P i+1 That is, the range of the target brightness value is: the target brightness value is more than or equal to 28.5 and less than or equal to 29.1.
Or to display the brightness value P i And display luminance value P i+1 As the target luminance value, i.e. the target luminance value (P) i +P i+1 ) /2, in this way, the Target brightness value is 25, if in fig. 2, the Target brightness value Target should be P i+1 And P i The midpoint of (a).
The target brightness value set in the step is applied to the calculation process of the brightness compensation values of all the lamp points in the following step, namely, for the whole LED display screen, only one target brightness value is set, and the target brightness value can be used for calculating the brightness compensation value of the whole screen.
Step S104: calculating strategy through preset brightness compensation value, target brightness value and display brightness value P i+1 Display brightness value P i And a gray scale setting value n,Calculating a gray value i, and calculating a brightness compensation value b of the lamp point to be corrected; wherein, the calculation strategy of the brightness compensation value is as follows: luminance compensation value b ═ target luminance value-display luminance value P i ) /(display luminance value P i+1 -display luminance value P i )+i]/n。
In combination with the above embodiments, if the gray-scale value 2, the gray-scale value 3 and the display brightness value P are determined according to the light point A 2 Display luminance value P of 20 3 If the target brightness value for the LED display screen is set to 25 at 30, the brightness compensation value b is [ (25-20)/(30-20) +2 for a]N; for the light point B, since the same target brightness value is used, the display brightness value P corresponding to the target brightness value 25 is gray scale 1 1 Display luminance value P of 20 and gray level 2 2 When the luminance compensation value B of the lamp point B is calculated as 30, the luminance compensation value B is [ (25-20)/(30-20) +1]And/n. When n is 3, the luminance compensation value of lamp point a is 0.83, and the luminance compensation value of lamp point B is 0.5; if n is 7, the luminance compensation value of lamp point a is 0.36, and the luminance compensation value of lamp point B is 0.21.
In connection with all examples of the invention, the following conclusions can be drawn:
(1) according to the difference of the values of n, n sets of brightness compensation values can be obtained through the embodiment of the invention, and each set of brightness compensation value comprises the brightness compensation value of each lamp point;
(2) when a target brightness value is set, a gray scale value i is selected to be smaller, otherwise, when n is a fixed value, the value i is larger, the calculated brightness compensation value b is larger, the brightness compensation is more, but for the condition of low gray scale, the brightness is not beneficial to excessive compensation, otherwise, the brightness of a lamp point under the low gray scale is too high;
(3) when setting the target brightness value, selecting the value close to P i+1 Is more preferable because [ (target brightness value-display brightness value P) i ) /(display luminance value P i+1 -display luminance value P i )]Is closer to 1, and since i is less than or equal to n-1, the closer the brightness compensation value b is to 1, the resulting brightness compensation value b is relatively less compensated for brighter lamps and relatively more compensated for darker lamps, so that the compensation effect for lamps with lower brightness is more pronounced, while the compensation effect for lamps with higher brightness is more pronouncedRelatively general.
The invention also includes a method for correcting the brightness of the LED display screen, as shown in FIG. 3, comprising:
step S201: and acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen.
The brightness compensation value b obtained in this embodiment is obtained by the method from step S101 to step S104 in the above embodiment, and the detailed process is not described herein again.
Step S202: and acquiring image display data of the LED display screen.
The image display data includes image content data to be displayed by the LED display screen, that is, the image display data includes set brightness values to be displayed by all the lamp points.
Step S203: calculating the brightness correction value of the corresponding lamp point according to a preset brightness correction value calculation strategy, a brightness compensation value b and image display data;
wherein, the brightness correction value calculation strategy is as follows:
the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data.
The correction coefficient k can be obtained through the existing correction scheme, the brightness correction value calculation strategy designed by the invention not only comprises the correction coefficient k multiplied by the set brightness value, but also comprises the brightness compensation value b added with the multiplication correction result, so the set brightness value is corrected by combining multiplication and addition, for the brightness value of the lamp point with high gray scale (when the value of x is larger), the size of the correction result mainly depends on the correction coefficient k, and for the brightness value of the lamp point with low gray scale (when the value of x is small), the size of the correction result mainly depends on the added brightness compensation value b, so that proper brightness correction can be carried out on all the lamp points, the condition that the low gray scale is not improved in the existing correction can not occur, and the normal display requirement can be met.
After the brightness correction value corresponding to each lamp point is calculated through the above steps, step S204 is executed.
Step S204: and sending the brightness correction values corresponding to all the lamp points to a receiving card.
And the receiving card receives the brightness correction value and then sends the brightness correction value to the LED display screen, and the LED display screen performs corresponding display according to the brightness correction values corresponding to all the lamp points.
The invention also includes a low gray scale correction device for an LED display screen, as shown in fig. 4, the low gray scale correction device 10 includes an LED display screen luminance data obtaining module 101, a target luminance value setting module 102, and a luminance compensation value calculating module 103, wherein:
the LED display screen brightness data acquisition module 101 is connected with the target brightness value setting module 102, the LED display screen brightness data acquisition module 101 is used for sequentially acquiring preset gray scale setting values n and LED display screen brightness data below each gray scale smaller than the gray scale setting values n, and each lamp point of the LED display screen in the LED display screen brightness data corresponds to n display brightness values;
a target brightness value setting module 102 connected to the LED display screen brightness data obtaining module 101 and the brightness compensation value calculating module 103, wherein the target brightness value setting module 102 is configured to select a display brightness value P corresponding to a gray level value i and a gray level value i +1 from n display brightness values corresponding to a lamp point to be corrected i And display luminance value P i+1 (ii) a Wherein i is less than or equal to n-1; and by displaying the luminance value P i And display luminance value P i+1 Setting a target brightness value;
a brightness compensation value calculating module 103 connected to the target brightness value setting module 102, wherein the brightness compensation value calculating module 103 is used for calculating a strategy, a target brightness value and a display brightness value P according to a preset brightness compensation value i+1 Display brightness value P i And gray scale set value n and gray scale value i, calculating brightness compensation value b of the lamp point to be corrected; the luminance compensation value calculation strategy is as follows: luminance compensation value b ═ target luminance value-display luminance value P i ) /(display luminance value P i+1 -display luminance value P i )+i]/n。
The low gray scale correction apparatus 10 of the present embodiment can be realized by the following steps:
step S101: the method comprises the steps of sequentially obtaining a preset gray scale set value n and LED display screen brightness data below each gray scale smaller than the gray scale set value n, wherein each lamp point of an LED display screen in the LED display screen brightness data corresponds to n display brightness values.
Step S102: selecting a display brightness value P corresponding to a gray level value i and a gray level value i +1 from n display brightness values corresponding to the lamp points to be corrected i And display luminance value P i+1 (ii) a Wherein i is less than or equal to n-1.
Step S103: by displaying the brightness value P i And display luminance value P i+1 A target brightness value is set.
Step S104: calculating strategy through preset brightness compensation value, target brightness value and display brightness value P i+1 Display brightness value P i Calculating a brightness compensation value b of the lamp point to be corrected according to the gray scale set value n and the gray scale value i; wherein, the brightness compensation value calculation strategy is as follows: luminance compensation value b ═ target luminance value-display luminance value P i ) /(display luminance value P i+1 -display luminance value P i )+i]/n。
The implementation process of each step can refer to the LED display screen low gray scale correction method of the foregoing embodiment, and will not be described herein again.
The present invention further includes a LED display screen brightness correction apparatus, as shown in fig. 5, the LED display screen brightness correction apparatus 20 includes a brightness compensation value obtaining module 201, an image display data obtaining module 202, a brightness correction value calculating module 203, and a brightness correction value issuing module 204, wherein:
the brightness compensation value acquisition module 201 is connected with the brightness correction value calculation module 203, and the brightness compensation value acquisition module 201 is used for acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen;
the image display data acquisition module 202 is connected with the brightness correction value calculation module 203, and the image display data acquisition module 202 is used for acquiring image display data of the LED display screen;
the brightness correction value calculation module 203 is connected with the brightness compensation value acquisition module 201, the image display data acquisition module 202 and the brightness correction value issuing module 204, and the brightness correction value calculation module 203 is used for calculating the brightness correction value corresponding to the light point according to a preset brightness correction value calculation strategy, the brightness compensation value b and the image display data; the luminance correction value calculation strategy is: the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data;
and the brightness correction value issuing module 204 is connected to the brightness correction value calculating module 203, and the brightness correction value issuing module 203 is configured to issue the brightness correction values corresponding to all the lamp points to the receiving card.
The receiving card 20 of the present embodiment can be implemented by the following steps:
step S201: and acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen.
The luminance compensation value b obtained in this embodiment is calculated by the low gray level correction apparatus 10 in the above embodiment, and the specific obtaining process is not described herein again.
Step S202: and acquiring image display data of the LED display screen.
Step S203: calculating the brightness correction value of the corresponding lamp point according to a preset brightness correction value calculation strategy, a brightness compensation value b and image display data;
wherein, the brightness correction value calculation strategy is as follows:
the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data.
Step S204: and sending the brightness correction values corresponding to all the lamp points to a receiving card.
The implementation process of the above steps can refer to the LED display screen brightness correction method of the foregoing embodiment, and will not be described herein again.
The present invention also includes a brightness correction system of an LED display screen, as shown in fig. 6, the brightness correction system includes the low gray scale correction apparatus 10 of the above embodiment, as well as the brightness correction apparatus 20, the receiving card 30, the LED display screen 50 and the camera 40, wherein:
the camera 40 is connected with the low gray scale correction device 10, and the camera 40 is used for sequentially shooting preset gray scale set values n and LED display screen brightness data below each gray scale smaller than the gray scale set values n;
the low gray scale correction device 10 is connected with the camera 40 and the brightness correction device 20, the low gray scale correction device 10 is used for acquiring brightness data of the LED display screen, and each lamp point of the LED display screen 50 in the brightness data of the LED display screen corresponds to n display brightness values; and a brightness compensation value b used for calculating the lamp point to be corrected;
the brightness correction device 20 is connected with the low gray scale correction device 10 and the receiving card 30, and the brightness correction device 20 is used for acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen 50; and acquiring image display data of the LED display screen 30; calculating the brightness correction value of the corresponding lamp point through a preset brightness correction value calculation strategy, a brightness compensation value b and image display data; the luminance correction value calculation strategy is: the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data; then, the brightness correction values corresponding to all the lamp points are issued to the receiving card 30;
the receiving card 30 is connected with the brightness correction device 20 and the LED display screen 50, and the receiving card 30 is used for receiving the brightness correction value and sending the brightness correction value to the LED display screen 50;
and the LED display screen 50 is connected with the receiving card 30, and the LED display screen 50 is used for displaying under a preset gray scale set value n and each gray scale smaller than the gray scale set value n in sequence and displaying according to the brightness correction value.
In the brightness correction system of the LED display screen according to the embodiment of the present invention, the low gray scale correction device 10 and the brightness correction device 20 may be implemented by one upper computer with corresponding functions, or two upper computers with respective functions may be connected to implement the low gray scale correction device, which is determined according to the use requirements, and the present invention is not limited specifically.
In the brightness correction system of the LED display screen according to the embodiment of the present invention, the receiving card should have a basic function of storing the correction coefficient, and should also have a function of supporting compensation, and the compensation function may utilize a self-contained compensation function of a chip, such as a silicon chip and a sun chip, and the chip compensation provides a compensation space smaller than a gray scale, so as to achieve the purpose of low gray scale compensation.
Specifically, in order to improve the acquisition precision of the brightness data of the low-gray-scale LED display screen, the camera in the embodiment of the invention adopts a CCM series high-precision camera.
The low gray scale correction method, device and brightness correction system for LED display screen of the embodiment of the invention firstly obtain the preset gray scale setting value n and the brightness data of the LED display screen under each gray scale smaller than the gray scale setting value n in turn, setting a target brightness value according to the display brightness value Pi and the display brightness value Pi +1 corresponding to the selected gray level value i and the gray level value i +1, calculating the brightness compensation value of the lamp point to be corrected through a preset brightness compensation value calculation strategy, when the target brightness value and the gray-scale setting value are constant values, the brightness compensation value obtained under the low brightness condition is larger than the brightness compensation value obtained under the slightly high brightness condition, so that when the brightness of the low gray-scale lamp point is compensated, the compensation effect on the lamp points with lower brightness is more obvious, while the compensation effect on the lamp points with higher brightness is relatively general, so that the problem that the low gray scale correction in the prior art is not improved is solved; on the other hand, after the brightness compensation value is obtained, the corresponding brightness correction value is calculated for each lamp point through the brightness correction value calculation strategy, the correction coefficient mainly plays a role in correcting high brightness, and the brightness compensation value mainly plays a role in correcting low brightness, so that the effective correction of the brightness values under all gray scales is realized, and the display requirement of people on the LED display screen is met.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.

Claims (10)

1. The utility model provides a LED display screen low gray level correction method which characterized in that includes:
sequentially acquiring a preset gray scale set value n and LED display screen brightness data below each gray scale smaller than the gray scale set value n, wherein each lamp point of an LED display screen in the LED display screen brightness data corresponds to n display brightness values;
selecting a display brightness value P corresponding to a gray level value i and a gray level value i +1 from n display brightness values corresponding to the lamp points to be corrected i And display luminance value P i+1 (ii) a Wherein i is less than or equal to n-1;
by said display luminance value P i And display luminance value P i+1 Setting a target brightness value;
calculating a strategy through a preset brightness compensation value, the target brightness value and the display brightness value P i+1 Display brightness value P i And the gray scale set value n and the gray scale value i, and calculating a brightness compensation value b of the lamp point to be corrected;
wherein the brightness compensation value calculation strategy is as follows:
luminance compensation value b ═ target luminance value-display luminance value P i ) /(display luminance value P i+1 -display luminance value P i )+i]/n。
2. The method for correcting the low gray scale of the LED display screen according to claim 1, wherein the gray scale setting value n has a value at 256 gray scales as follows: n is more than or equal to 1 and less than or equal to 7.
3. The method of claim 1, wherein the display brightness value P is used to correct low gray levels of the LED display screen i And display luminance value P i+1 Setting the target brightness value as: p i The target brightness value is less than or equal to P i+1 。
4. The method of claim 1 wherein the display luminance value P is determined by the low gray scale correction of the LED display screen i And display luminance value P i+1 Setting the target brightness value as: 0.9P i+1 The target brightness value is less than or equal to P i+1 。
5. The method of claim 1, wherein the display brightness value P is used to correct low gray levels of the LED display screen i And display luminance value P i+1 Setting the target brightness value as: target luminance value ═ P i +P i+1 )/2。
6. A method for correcting brightness of an LED display screen is characterized by comprising the following steps:
acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen, which is calculated by the method of any one of claims 1-5;
acquiring image display data of an LED display screen;
calculating the brightness correction value of the corresponding lamp point according to a preset brightness correction value calculation strategy, the brightness compensation value b and image display data;
sending the brightness correction values corresponding to all the lamp points to a receiving card;
wherein the brightness correction value calculation strategy is:
the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data.
7. The utility model provides a LED display screen low gray scale correcting unit, its characterized in that, low gray scale correcting unit includes LED display screen luminance data acquisition module, target brightness value set module, luminance compensation value calculation module, wherein:
the LED display screen brightness data acquisition module is connected with the target brightness value setting module and is used for sequentially acquiring a preset gray scale setting value n and LED display screen brightness data below each gray scale smaller than the gray scale setting value n, and each lamp point of the LED display screen in the LED display screen brightness data corresponds to n display brightness values;
the target brightness value setting module is connected with the LED display screen brightness data acquisition module and the brightness compensation value calculation module, and is used for selecting a display brightness value P corresponding to a gray level value i and a gray level value i +1 from n display brightness values corresponding to a lamp point to be corrected i And display luminance value P i+1 (ii) a Wherein i is less than or equal to n-1; and, by said display luminance value P i And display luminance value P i+1 Setting a target brightness value;
the brightness compensation value calculating module is connected with the target brightness value setting module and is used for calculating a strategy, the target brightness value and the display brightness value P according to a preset brightness compensation value i+1 Display brightness value P i And the gray scale set value n and the gray scale value i, and calculating a brightness compensation value b of the lamp point to be corrected; the brightness compensation value calculation strategy is as follows: luminance compensation value b ═ target luminance value-display luminance value P i ) /(display luminance value P i+1 -display luminance value P i )+i]/n。
8. The LED display screen brightness correction device is characterized by comprising a brightness compensation value acquisition module, an image display data acquisition module, a brightness correction value calculation module and a brightness correction value issuing module, wherein:
the brightness compensation value obtaining module is connected with the brightness correction value calculating module, and is used for obtaining a brightness compensation value b corresponding to a lamp point in the LED display screen from the low gray scale correction device of claim 7;
the image display data acquisition module is connected with the brightness correction value calculation module and is used for acquiring image display data of the LED display screen;
the brightness correction value calculation module is connected with the brightness compensation value acquisition module, the image display data acquisition module and the brightness correction value issuing module, and is used for calculating the brightness correction value of the corresponding lamp point according to a preset brightness correction value calculation strategy, the brightness compensation value b and the image display data; the brightness correction value calculation strategy is as follows: the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data;
and the brightness correction value issuing module is connected with the brightness correction value calculating module and is used for issuing the brightness correction values corresponding to all the lamp points to the receiving card.
9. An LED display screen brightness correction system, comprising the low gray scale correction device of claim 7, and a brightness correction device, a receiving card, an LED display screen, and a camera, wherein:
the camera is connected with the low gray scale correction device and is used for sequentially shooting preset gray scale set values n and LED display screen brightness data below each gray scale smaller than the gray scale set values n;
the low gray scale correction device is connected with the camera and the brightness correction device, and is used for acquiring brightness data of the LED display screen, wherein each lamp point of the LED display screen in the brightness data of the LED display screen has n display brightness values; and a brightness compensation value b used for calculating the lamp point to be corrected;
the brightness correction device is connected with the low gray scale correction device and the receiving card and is used for acquiring a brightness compensation value b corresponding to a lamp point in the LED display screen; acquiring image display data of the LED display screen; calculating the brightness correction value of the corresponding lamp point through a preset brightness correction value calculation strategy, the brightness compensation value b and the image display data; the brightness correction value calculation strategy is as follows: the luminance correction value k x + b; wherein k is a preset correction coefficient, and x is a set brightness value of a corresponding lamp point in the image display data; then the brightness correction values corresponding to all the lamp points are issued to a receiving card;
the receiving card is connected with the brightness correction device and the LED display screen and is used for receiving the brightness correction value and sending the brightness correction value to the LED display screen;
the LED display screen is connected with the receiving card and used for displaying under a preset gray scale set value n and each gray scale smaller than the gray scale set value n in sequence and displaying according to the brightness correction value.
10. The LED display screen brightness correction system of claim 9, wherein the camera is a CCM camera.
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