CN106409196B - LED display control card fault detection method - Google Patents

LED display control card fault detection method Download PDF

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CN106409196B
CN106409196B CN201611025638.6A CN201611025638A CN106409196B CN 106409196 B CN106409196 B CN 106409196B CN 201611025638 A CN201611025638 A CN 201611025638A CN 106409196 B CN106409196 B CN 106409196B
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led lamp
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color
display control
control card
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CN106409196A (en
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王雨
杨城
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Xian Novastar Electronic Technology Co Ltd
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Xian Novastar Electronic Technology Co Ltd
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays

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Abstract

The invention provides a method for detecting faults of an LED display control card, which comprises the following steps: acquiring pure-color full-bright images and black images of an LED lamp panel in signal connection with an LED display control card to be detected; analyzing the acquired pure color full-bright image and the acquired black image to obtain the bright chromatic values of all LED lamp points in the pure color full-bright image and the black image and setting a plurality of fault threshold values; and comparing the LED lamp points point by point with the plurality of fault thresholds to judge whether the LED display control card to be detected has faults or not and outputting fault types when the faults exist. Therefore, the invention can indirectly realize the fault detection of the LED display control card such as a receiving card and output the fault type by detecting the fault phenomenon of the LED lamp panel in signal connection with the LED display control card to be detected, thereby improving the fault detection efficiency of the LED display control card.

Description

LED display control card fault detection method
Technical Field
The invention relates to the technical field of LED display manufacturing, in particular to a method for detecting faults of an LED display control card.
Background
Since the 21 st century, the color display industry has been unprecedentedly developed, and the LED display screens have spread over central squares and commercial buildings in most cities. The LED display screen is well received by people due to the advantages of bright color, high visibility, low power consumption and the like. However, the display screen has faults, and in the past, whether the screen body has faults or not is judged manually; thus, the efficiency is low, automation cannot be realized, and the requirements of modern industry cannot be met. Generally speaking, the failure of an LED display control card, such as a receiving card, at the front end of the LED lamp panel can cause the problems of black screen, incorrect shape, incorrect color, background mottle, screen flashing and the like of the LED lamp panel.
Disclosure of Invention
Therefore, the primary objective of the present invention is to provide a method for detecting a failure of an LED display control card, so as to detect whether the LED display control card, such as a receiving card, has a failure and the type of the failure.
Specifically, the method for detecting the fault of the LED display control card provided by the embodiment of the present invention includes the steps of: (i) acquiring pure-color full-bright images and black images of an LED lamp panel in signal connection with an LED display control card to be detected; (ii) analyzing the acquired pure color full-bright image and the acquired black image to obtain the bright chromatic values of all LED lamp points in the pure color full-bright image and the black image and setting a plurality of fault threshold values; and (iii) comparing the LED lamp points point by point with the plurality of fault thresholds to judge whether the LED display control card to be detected has faults or not and outputting fault types when the faults exist.
In one embodiment of the present invention, the aforementioned step (ii) comprises: setting a black screen threshold value for judging whether a black screen fault exists or not by using the brightness mean value of each LED lamp point in the black image, setting a shape-opposite threshold value for judging whether a shape-opposite fault exists or not by using the brightness mean value of each LED lamp point in the pure-color full-bright image, and setting a color-opposite threshold value for judging whether a color-opposite fault exists or not by using the color coordinate mean value of each LED lamp point in the pure-color image.
In one embodiment of the present invention, the aforementioned step (iii) comprises: judging whether the brightness value of each LED lamp point in the pure-color full-bright image is smaller than the black screen threshold value point by point, and judging that the LED display control card to be detected has a black screen fault when the number of the LED lamp points with the brightness values smaller than the black screen threshold value reaches a preset number; judging whether the brightness value of each LED lamp point in the pure-color full-bright image is smaller than the shape unpaired threshold value point by point, and judging that the LED display control card to be detected has the shape unpaired fault when the brightness value is smaller than the shape unpaired threshold value; and judging whether the color coordinates of all the LED lamp points in the pure-color full-bright image exceed the color non-alignment threshold range point by point, and judging that the LED display control card to be detected has a color non-alignment fault when the color coordinates exceed the color non-alignment threshold range.
In an embodiment of the present invention, the method for detecting a failure of an LED display control card further includes: acquiring a pure-color line image of the LED lamp panel; analyzing the pure-color line image to obtain the brightness and chroma values of all the LED lamp points in the pure-color line image, and setting a background variegated threshold value for judging whether a background variegated fault exists according to the brightness average value of all the LED lamp points; and judging whether the LED lamp points are the LED lamp points which should be lightened point by point, and comparing the brightness values of the LED lamp points which should not be lightened with the background variegated threshold value to judge whether the LED display control card to be detected has background variegated faults.
In an embodiment of the present invention, the method for detecting a failure of an LED display control card further includes: repeatedly shooting and collecting the first pure-color full-bright image and the second pure-color full-bright image of the LED lamp panel with the same color within a certain time; analyzing the first pure-color full-bright image and the second pure-color full-bright image to obtain the bright chromatic value of each LED lamp point in the first pure-color full-bright image and the second pure-color full-bright image; dividing the brightness value of each LED lamp point in the first pure color full-bright image and the brightness value of each LED lamp point in the second pure color full-bright image one by one to obtain the brightness ratio value of each LED lamp point, judging whether the brightness ratio value exceeds a set splash screen threshold range or not, and judging that the LED display control card to be detected has a splash screen fault if the brightness ratio value exceeds the set splash screen threshold range.
In an embodiment of the present invention, the method for detecting a failure of an LED display control card further includes: and outputting the LED corresponding to the fault type to display the fault reason of the control card.
In an embodiment of the invention, the LED display control card to be detected is a receiving card, and the receiving card is connected to one or more LED lamp panels through a flat cable.
In addition, a method for detecting a failure of an LED display control card according to another embodiment of the present invention includes: acquiring a pure-color line image of an LED lamp panel in signal connection with an LED display control card to be detected; analyzing the pure-color line image to obtain the brightness and chroma values of all the LED lamp points in the pure-color line image and setting a fault threshold value according to the brightness average value of all the LED lamp points; and judging whether the LED lamp points are the LED lamp points which should be lightened point by point, comparing the brightness values of the LED lamp points which should not be lightened with the fault threshold value to judge whether the LED display control card to be detected has faults or not, and outputting the fault type when the faults exist.
In addition, a method for detecting a fault of an LED display control card according to another embodiment of the present invention includes the steps of: repeatedly shooting and collecting the first pure-color full-bright image and the second pure-color full-bright image of the LED lamp panel with the same color within a certain time; analyzing the first pure-color full-bright image and the second pure-color full-bright image to obtain the bright chromatic value of each LED lamp point in the first pure-color full-bright image and the second pure-color full-bright image; dividing the brightness value of each LED lamp point in the first pure color full-bright image and the brightness value of each LED lamp point in the second pure color full-bright image one by one to obtain a brightness proportion value of each LED lamp point, and judging whether the brightness proportion value exceeds a set threshold range to determine whether the LED display control card to be detected has a fault and outputting a fault type when the fault exists.
Therefore, the invention can indirectly realize the fault detection of the LED display control card such as a receiving card and output the fault type by detecting the fault phenomenon of the LED lamp panel in signal connection with the LED display control card to be detected, thereby improving the fault detection efficiency of the LED display control card.
Other aspects and features of the present invention will become apparent from the following detailed description, which proceeds with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
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The following detailed description of embodiments of the invention will be made with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for detecting a failure of an LED display control card according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Specifically, the method for detecting the failure of the LED display control card provided in this embodiment is mainly to detect the failure of the LED display control card indirectly by detecting a failure phenomenon on the LED lamp panel caused by the failure of the LED display control card. Typically, in the detection method, the LED display control card to be detected is connected to one or more LED lamp panels without failure; the LED display control card is, for example, a receiving card, which is typically connected to one or more LED lamp panels through a flat cable; the LED lamp panel comprises a circuit board, an LED lamp point array arranged on the circuit board, and a row decoding circuit and a column driving circuit which are arranged on the circuit board and electrically connected with the LED lamp point array; and in the case of an RGB full-color LED light panel, a single LED light point typically includes red, green, and blue LED chips.
Generally, the failure phenomenon on the LED lamp panel caused by the failure of the front LED display control card, such as the receiving card, includes: black screen, unpaired shape, unpaired color, background mottle and flashing screen; the failure phenomenon is specifically described as follows:
1. the black screen means that the LED display control card sends a lighting signal to the LED lamp panel but the LED lamp panel is not lighted;
2. the shape is not right, namely that a certain LED lamp on the LED lamp panel is too dark or not lighted;
3. the color inconsistency refers to the color display error of the LED lamp panel or LED lamp points in some areas of the LED lamp panel when the LED lamp panel is controlled to be lightened;
4. the background variegated color means that the LED lamp points which should not be lightened are lightened when the LED lamp panel is controlled to display the oblique line image; and
5. the flashing screen means that LED lamps in certain areas are lighted up and then are lighted up and dark and are flashed.
In order to facilitate understanding of the present invention, the steps of the LED display control card fault detection method of the present embodiment will be described in detail with reference to fig. 1:
firstly, gather and wait to detect the image of the LED lamp plate of LED display control card signal connection, specifically can be:
a. acquiring a pure color image, wherein faults which can be detected include a black screen, an incorrect shape and an incorrect color; for an RGB full-color LED lamp panel, the acquired pure-color images include, for example, pure-color full-bright images such as acquired red, green, blue, white images, and the like, and pure-color full-dark images such as black images (i.e., images when the whole LED lamp panel is controlled not to be lit), wherein the red, green, and blue are primary-color full-bright images;
b. acquiring a pure-color line image such as a white oblique line image, wherein faults which can be detected include black screen, incorrect shape, incorrect color and background mottle; and
c. repeatedly shooting and collecting two pure-color full-bright images with the same color within a certain time, wherein a detectable fault is a flashing screen; the time interval of the repeated shooting can be set according to experience, so that different brightness degrees of the LED lamp point during the twinkling can be shot under the condition that the LED lamp point twinkles.
Secondly, analyzing and processing the collected LED lamp panel images and acquiring respective fault threshold values for LED display control card fault detection, wherein the fault detection specifically comprises the following steps: analyzing and processing the collected LED lamp panel image (such as lamp point positioning and the like, which are mature technologies and therefore not described in detail herein) to obtain LED lamp lighting chromaticity data in each pure color image, then taking 4 times of the brightness mean value of each LED lamp point in the black image as a black screen threshold, taking 0.7 times of the brightness mean value of each LED lamp point in the pure color full-bright image as a shape non-aligned threshold, taking 0.5 times of the brightness mean value of each LED lamp point in the pure color line image as a background variegated threshold, taking 0.8 times and 1.2 times of the color coordinate mean value of each LED lamp point in the pure color full-bright image as color non-aligned thresholds, and taking 0.9 and 1.1 as a flashing screen threshold for flashing detection; it should be noted that, the value of the multiple of each failure threshold (black screen threshold, shape not to threshold, background mottle threshold, color not to threshold, and splash screen threshold) may be set appropriately according to the actual application, and is not limited to the example here.
Then, fault detection is performed according to a set fault threshold value to output a detection result, and the specific detection method may be:
and judging whether the LED lamp points are required to be lightened or not point by point, if so, further carrying out black screen, shape non-right and color non-equal fault detection, and otherwise, if not, further carrying out background variegated fault detection. Wherein:
1. regarding the detection of black screen failure: if the brightness values of the LED lamp points of a preset number, such as 90%, on the LED lamp panel are smaller than the black screen threshold value, the LED lamp panel is considered to be a black screen fault;
2. no detection of faults with respect to shape: if the brightness value of a certain LED lamp point is smaller than the shape-pair-free threshold value, the LED lamp point is considered as a shape-pair-free fault;
3. regarding the detection of color non-failure: if the color coordinate of a certain LED lamp point is outside the color non-threshold range (namely, the color non-threshold range is exceeded), the LED lamp point is considered as a color non-fault;
4. detection of background mottle failure: if the brightness value of the LED lamp points which should not be lightened is larger than the background variegated threshold value, the LED lamp points are considered as background variegated faults.
Further, the detection of the splash screen fault is: and dividing the brightness values of the LED lamp points in the two pure-color full-bright images with the same color obtained by repeated shooting point by point to obtain the brightness ratio value of each LED lamp point (namely the brightness ratio of each LED lamp point in the two pure-color full-bright images with the same color) by calculation, and if the ratio value is out of the range of the splash screen threshold value, determining that the ratio value is the splash screen fault.
In addition, after the detection result is obtained by the detection method, the failure reason of the LED display control card causing the LED lamp panel failure can be further estimated as output according to the detection result: 1) a black screen fault may be a wrong parameter of the receiving card; 2) the shape is not correct for faults, and possibly the signal of the LED with the color corresponding to the interface is damaged; 3) color error, maybe the problems of cold solder joint, short circuit, etc.; 4) background mottle failure, possibly control line failure; and 5), a splash screen failure, possibly a memory failure.
Finally, it should be noted that, in the foregoing embodiment, the captured pure color full bright image and the black image may also be used to detect the black screen, the shape misalignment, and the color misalignment faults, the captured pure color line image is used to detect only the background mottle faults, and the captured pure color full bright image of the same color is repeatedly captured within a certain time to detect the flicker faults. It should be noted that the names of the failure types (black screen, shape error, color error, background mottle, and splash screen) are only for convenience of distinguishing from each other, and are not intended to limit the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. A method for detecting faults of an LED display control card is characterized by comprising the following steps:
(i) acquiring pure-color full-bright images and black images of an LED lamp panel in signal connection with an LED display control card to be detected;
(ii) analyzing the acquired pure color full-bright image and the acquired black image to obtain the bright chromatic values of all LED lamp points in the pure color full-bright image and the black image and setting a plurality of fault threshold values; and
(iii) comparing the LED lamp points point by point with the plurality of fault thresholds to judge whether the LED display control card to be detected has faults or not and outputting fault types when the faults exist;
the LED display control card fault detection method further comprises the following steps:
acquiring a pure-color line image of the LED lamp panel;
analyzing the pure-color line image to obtain the brightness and chroma values of all the LED lamp points in the pure-color line image, and setting a background variegated threshold value for judging whether a background variegated fault exists according to the brightness average value of all the LED lamp points;
judging whether the LED lamp points are the LED lamp points which should be lightened point by point, and comparing the brightness values of the LED lamp points which should not be lightened with the background variegated threshold value to judge whether the LED display control card to be detected has background variegated faults;
the LED display control card fault detection method further comprises the following steps:
repeatedly shooting and collecting the first pure-color full-bright image and the second pure-color full-bright image of the LED lamp panel with the same color within a certain time;
analyzing the first pure-color full-bright image and the second pure-color full-bright image to obtain the bright chromatic value of each LED lamp point in the first pure-color full-bright image and the second pure-color full-bright image;
dividing the brightness value of each LED lamp point in the first pure color full-bright image and the brightness value of each LED lamp point in the second pure color full-bright image one by one to obtain the brightness ratio value of each LED lamp point, judging whether the brightness ratio value exceeds a set splash screen threshold range or not, and judging that the LED display control card to be detected has a splash screen fault if the brightness ratio value exceeds the set splash screen threshold range;
the LED display control card to be detected is connected to one or more LED lamp panels without faults.
2. The LED display control card fault detection method of claim 1, wherein step (ii) comprises: setting a black screen threshold value for judging whether a black screen fault exists or not by using the brightness mean value of each LED lamp point in the black image, setting a shape-opposite threshold value for judging whether a shape-opposite fault exists or not by using the brightness mean value of each LED lamp point in the pure-color fully-bright image, and setting a color-opposite threshold value for judging whether a color-opposite fault exists or not by using the color coordinate mean value of each LED lamp point in the pure-color fully-bright image.
3. The LED display control card fault detection method of claim 2, wherein step (iii) comprises:
judging whether the brightness value of each LED lamp point in the pure-color full-bright image is smaller than the black screen threshold value point by point, and judging that the LED display control card to be detected has a black screen fault when the number of the LED lamp points with the brightness values smaller than the black screen threshold value reaches a preset number;
judging whether the brightness value of each LED lamp point in the pure-color full-bright image is smaller than the shape unpaired threshold value point by point, and judging that the LED display control card to be detected has the shape unpaired fault when the brightness value is smaller than the shape unpaired threshold value;
and judging whether the color coordinates of all the LED lamp points in the pure-color full-bright image exceed the color non-alignment threshold range point by point, and judging that the LED display control card to be detected has a color non-alignment fault when the color coordinates exceed the color non-alignment threshold range.
4. The LED display control card fault detection method of claim 1, further comprising the steps of: and outputting the LED corresponding to the fault type to display the fault reason of the control card.
5. The method for detecting the faults of the LED display control card according to any one of claims 1 to 4, wherein the LED display control card to be detected is a receiving card, and the receiving card is connected with one or more LED lamp panels through a flat cable.
6. A method for detecting faults of an LED display control card is characterized by comprising the following steps:
acquiring a pure-color line image of an LED lamp panel in signal connection with an LED display control card to be detected;
analyzing the pure-color line image to obtain the brightness and chroma values of all the LED lamp points in the pure-color line image and setting a fault threshold value according to the brightness average value of all the LED lamp points; and
judging whether the LED lamp points are the LED lamp points which should be lightened point by point, and comparing the brightness values of the LED lamp points which should not be lightened with the fault threshold value to judge whether the LED display control card to be detected has faults or not and outputting the fault types when the faults exist;
the LED display control card fault detection method further comprises the following steps:
repeatedly shooting and collecting the first pure-color full-bright image and the second pure-color full-bright image of the LED lamp panel with the same color within a certain time;
analyzing the first pure-color full-bright image and the second pure-color full-bright image to obtain the bright chromatic value of each LED lamp point in the first pure-color full-bright image and the second pure-color full-bright image;
dividing the brightness value of each LED lamp point in the first pure color full-bright image and the brightness value of each LED lamp point in the second pure color full-bright image one by one to obtain a brightness proportion value of each LED lamp point, and judging whether the brightness proportion value exceeds a set threshold range to determine whether the LED display control card to be detected has a fault and outputting a fault type when the fault exists;
the LED display control card to be detected is connected to one or more LED lamp panels without faults.
7. A method for detecting faults of an LED display control card is characterized by comprising the following steps:
repeatedly shooting and collecting the LED lamp panel within a certain time to obtain a first pure color full-bright image and a second pure color full-bright image of the same color of the LED lamp panel;
analyzing the first pure-color full-bright image and the second pure-color full-bright image to obtain the bright chromatic value of each LED lamp point in the first pure-color full-bright image and the second pure-color full-bright image;
dividing the brightness value of each LED lamp point in the first pure color full-bright image and the brightness value of each LED lamp point in the second pure color full-bright image one by one to obtain a brightness proportion value of each LED lamp point, and judging whether the brightness proportion value exceeds a set threshold range to determine whether the LED display control card to be detected has a fault and outputting a fault type when the fault exists;
the LED display control card to be detected is connected to one or more LED lamp panels without faults.
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