CN107610628B - LED display unit board detection device and method - Google Patents
LED display unit board detection device and method Download PDFInfo
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- CN107610628B CN107610628B CN201711019144.1A CN201711019144A CN107610628B CN 107610628 B CN107610628 B CN 107610628B CN 201711019144 A CN201711019144 A CN 201711019144A CN 107610628 B CN107610628 B CN 107610628B
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Abstract
The invention relates to a device and a method for detecting an LED display unit board, wherein the device comprises a power supply output terminal, a signal output interface and a main control board; the signal output interface is connected to the main control board and used for controlling the on-off and the bright-dark state of each LED lamp bead on the LED display unit board by the main control board; the LED display device comprises a power supply output terminal, a main control board and a power supply output terminal, wherein the power supply output terminal is provided with a current detection device and used for providing direct current power supply for an LED display unit board; the main control board is used for comparing the measured current value of the power output terminal and the designed current value and judging whether the LED display unit board works normally or not. Whether the LED display unit board works normally or not can be detected quickly, and meanwhile misjudgment and misjudgment are not easy to occur.
Description
Technical Field
The invention relates to the field of LED display unit boards, in particular to a device and a method for detecting an LED display unit board.
Background
The LED display unit board is mainly composed of a power input interface, a signal output interface, a row decoding driving circuit, a column driving circuit and two-dimensional array driving LED lamp beads formed by rows and columns. The working state of the LED display unit board is controlled by the signal input interface, and the signal output interface is used for controlling signal forwarding driving and data signal cascading. The main method for detecting the LED display unit board at present is to adopt a method of human eye observation or visual identification after different patterns are displayed by electrifying; the method not only has low detection efficiency, but also is easy to have the situations of misjudgment and missed judgment.
Disclosure of Invention
Therefore, it is necessary to provide a device and a method for detecting an LED display unit panel, which solve the problems of low efficiency and high error rate of the conventional LED display unit panel detection.
In order to achieve the above object, the inventor provides a device for detecting an LED display unit board, comprising a power output terminal, a signal output interface and a main control board;
the signal output interface is connected to the main control board and used for controlling the on-off and the bright-dark state of each LED lamp bead on the LED display unit board by the main control board;
the LED display device comprises a power supply output terminal, a main control board and a power supply output terminal, wherein the power supply output terminal is provided with a current detection device and used for providing direct current power supply for an LED display unit board;
the main control board is used for comparing the measured current value of the power output terminal and the designed current value and judging whether the LED display unit board works normally or not.
And further optimizing, the main control board further measures the current value of each LED lamp bead on the board when being lightened through the current measuring device, and compares the current values of each LED lamp bead when being lightened.
The LED display unit further comprises a signal read-back interface, the signal read-back interface is connected to the main control board, the signal read-back interface is used for the main control board to read back the output interface signals of the LED display unit board, and the main control board is further used for comparing the logic and time sequence relation between the input interface signals and the output interface signals of the LED display unit.
Further optimization, still include human-computer interaction equipment, human-computer interaction equipment connects in the main control board, human-computer interaction equipment is used for operating this detection device.
The inventor also provides another technical scheme that: a detection method for an LED display unit plate comprises the following steps:
providing a direct current power supply for the LED display unit board through a power supply output terminal;
the on-off and the bright-dark state of the LED lamp beads on the LED display unit board are controlled through the signal output interface;
measuring the current value flowing through the power supply output terminal by a current detection device;
and comparing the measured current value flowing through the power supply output terminal with the designed current value, and judging whether the LED display unit plate works normally or not.
Further optimization, the method also comprises the following steps:
and measuring the current value of each LED lamp bead on the LED display unit board when the LED lamp beads are lightened through a current detection device, and comparing the current values of each LED lamp bead when the LED lamp beads are lightened.
Further optimization, the method also comprises the following steps:
and reading back the output interface signal of the LED display unit board through the signal read-back interface, and comparing the logic and time sequence relation of the input interface signal of the LED display unit board and the read-back output interface signal. Further optimization, the method also comprises the following steps:
the detection device is operated through a man-machine interaction device.
The switch and the bright and dark state of each lamp post on the LED display unit board are controlled, the corresponding circulating current value on the power supply output terminal is detected, the current value is compared with the set current value to judge whether the logic circuit of the LED display unit board and the LED lamp work normally, whether the LED display unit board works normally can be quickly detected, and meanwhile misjudgment and missing judgment are not easy to occur.
Drawings
FIG. 1 is a schematic structural diagram of an LED display unit panel inspection device according to an embodiment;
fig. 2 is a schematic flow chart of a method for detecting an LED display unit panel according to an embodiment.
Description of reference numerals:
110. the main control board is provided with a main control board,
120. a signal output interface for outputting a signal to the computer,
131. a power supply output terminal for outputting a power supply voltage,
132. a current detection device for detecting the current of the power supply,
140. a signal read-back interface is connected with the signal read-back interface,
150. an LED display unit plate is arranged on the LED display unit plate,
160. and (3) a human-computer interaction device.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Referring to fig. 1, the LED display unit board detection device of the present embodiment includes a power output terminal 131, a signal output interface 120, and a main control board 110;
the signal output interface 120 is connected to the main control board 110, and the signal output interface 120 is used for the main control board 110 to control the on/off and the bright/dark state of each LED lamp bead on the LED display unit board 150;
the power output terminal 131 is provided with a current detection device 132, the power output terminal 131 is used for providing a direct current power supply for the LED display unit board 150, the current detection device 132 is connected to the main control board 110, and the current detection device 132 is used for the main control board 110 to measure a current value flowing on the power output terminal 131;
the main control board 110 is configured to compare the measured current value flowing through the power output terminal 131 with a designed current value, and determine whether the LED display unit board 150 is working normally.
During detection, direct current power is provided for the LED display unit board 150 through the power output terminal 131, the main control board 110 controls the LED display unit board 150 through the signal output interface 120, the current value of the circulating current on the power output terminal 131 is correspondingly detected through the current detection device 132 by controlling the on-off state, the brightness state and the like of each LED lamp bead of the LED display unit board 150 and according to the on-off state, the brightness state and the like of each LED lamp bead, and the detected current value of the circulating current on the power output terminal 131 is compared with the set current value, so that whether the logic circuit on the LED display unit board 150 and the LED lamp beads work normally or not is judged. When the current value detected according to the switch of the LED lamp bead and the bright and dark state accords with the set current value, the LED lamp bead and the logic circuit thereof are judged to work normally, and when the detected current value does not accord with the set current value, the LED lamp bead or the logic circuit thereof can be judged to work abnormally. Whether normal work can be detected through this device to LED display element board 150 fast, and be difficult to appear erroneous judgement and miss judgement to have certain fault location ability, know which LED lamp pearl breaks down, the automatic detection is applicable to current LED display element board 150's production line moreover.
Specifically, for example, a 10 × 10 LED display unit board 150 is detected, the total dark quiescent current of the LED display unit board 150 is 50MA, that is, when all LED lamp beads on the LED display unit board 150 are totally dark, the current of the LED display unit board is 50MA, 20MA is required for lighting one LED lamp bead, and 10MA is required for half-lighting one LED lamp bead; that is, when the LED display unit board 150 is detected, and when the LED lamp beads on the LED display unit board 150 are all dark, the current detection device 132 detects that the current value of the flowing current of the power output terminal 131 is 50 MA; when one LED lamp bead is fully bright, the current detection device 132 detects that the current value of the circulating current of the power output terminal 131 is 70 MA; when one LED lamp bead is half bright, the current detection device 132 detects that the current value of the circulating current of the power output terminal 131 is 60 MA; when the two LED lamp beads are fully on, the current detection device 132 detects that the current value of the circulating current of the power output terminal 131 is 90 MA; when the LED display unit board 150 is detected, the full dark quiescent current of the LED display unit board 150 is detected first, and whether the LED display unit board 150 is working normally is determined by detecting the full dark quiescent current first; when each LED lamp bead on the LED display unit board 150 is in a full-bright or half-bright state, the current value of the current flowing through the power output terminal 131 is compared with the set current value, and whether the operation of each LED lamp bead is normal or not is determined. For example, when detecting that the LED lamp beads in the fifth row and the sixth row are in a full-on state, the current detection device 132 detects that the current of the power output terminal 131 is 50MA, and may determine that the LED lamp beads in the fifth row and the sixth row are abnormal in operation.
In this embodiment, in order to detect the problem of consistency and discreteness of the LED lamp beads on the LED display unit board 150, the main control board 110 is further configured to measure the current value of each LED lamp bead on the LED display unit board 150 when being lit through the current detection device 132, and compare the current value of each LED lamp bead when being lit. The main control board 110 detects that each LED lamp bead on the LED display unit board 150 is current in the lighted state through the current detection device 132, compares current values detected when each LED lamp bead is in the lighted state, can obtain discreteness of the LED lamp beads and the driving chip on the LED display unit board through comparison, and can detect whether a problem of insufficient soldering or missing soldering exists in the LED display unit board 150.
In this embodiment, in order to detect whether the signal forwarding and cascading functions of the LED display unit board 150 are normal, the LED display unit board further includes a signal readback interface 140, the signal readback interface 140 is connected to the main control board 110, the signal readback interface 140 is used for the main control board 110 to read back the output interface signal of the LED display unit board 150, and the main control board 110 is further used for comparing the logical and time sequence relationships between the input interface signal and the output interface signal of the LED display unit board 150. The main control board 110 reads back the output interface of the LED display unit board 150 through the signal read-back interface 140, compares the output interface with the control signal of the input interface of the LED display unit board 150 to determine whether the signal forwarding and cascading functions of the LED display unit board 150 are normal.
In this embodiment, in order to perform detection on different LED display unit boards 150, the LED display unit board further includes a human-computer interaction device 160, the human-computer interaction device 160 is connected to the main control board, and the human-computer interaction device 160 is used to operate the detection apparatus, for example, to input detection parameters to the main control board. The human-computer interaction device 160 can input different detection parameters into the main control panel 110, so that different LED display unit panels 150 can be detected. The human-computer interaction device 160 may be a touch display screen, which may be used to input detection parameters and display the detection condition of the LED display unit board 150.
Referring to fig. 2, another embodiment of the present invention provides a method for detecting an LED display unit panel, including the following steps:
step S210: providing a direct current power supply for the LED display unit board through a power supply output terminal;
step S220: the on-off and the bright-dark state of the LED lamp beads on the LED display unit board are controlled through the signal output interface;
step S230: measuring the current value flowing through the power supply output terminal by a current detection device;
step S240: and comparing the measured current value flowing through the power supply output terminal with the designed current value, and judging whether the LED display unit plate works normally or not.
During detection, direct current power supply is provided for the LED display unit board through the power output terminal, the LED display unit board is controlled through the signal output interface, the current value flowing on the power output terminal is correspondingly detected through the current detection device according to the states of the LED lamp beads of the LED display unit board, such as on-off states, brightness states and the like, and the detected current value flowing on the power output terminal is compared with the set current value, so that whether the logic circuit on the LED display unit board and the LED lamp beads work normally or not is judged. When the current value detected according to the switch of the LED lamp bead and the bright and dark state accords with the set current value, the LED lamp bead and the logic circuit thereof are judged to work normally, and when the detected current value does not accord with the set current value, the LED lamp bead or the logic circuit thereof can be judged to work abnormally. Whether normal work can be detected through this device fast LED display element board, and be difficult to appear erroneous judgement and miss judgement to have certain fault location ability, know which LED lamp pearl breaks down, the automatic detection is applicable to on the production line of current LED display element board moreover.
Specifically, for example, a 10 × 10 LED display unit board is detected, the total dark quiescent current of the LED display unit board is 50MA, that is, when all LED lamp beads on the LED display unit board are totally dark, the current of the LED display unit board is 50MA, 20MA current is required for lighting one LED lamp bead, and 10MA current is required for semi-lighting one LED lamp bead; when the LED display unit board is detected, when the LED lamp beads on the LED display unit board are completely dark, the current detection device detects that the current value of the circulating current of the power supply output terminal is 50 MA; when one LED lamp bead is fully bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 70 MA; when one LED lamp bead is semi-bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 60 MA; when the two LED lamp beads are fully bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 90 MA; when the LED display unit board is detected, the full-dark static current of the LED display unit board is detected firstly, and whether the LED display unit board works normally or not is judged by detecting the full-dark static current; and when each LED lamp bead on the LED display unit board is in a full-bright state or a half-bright state, the current value circulating on the power output terminal is compared with the set current value, and whether the work of each LED lamp bead is normal or not is judged. For example, when detecting that the LED lamp beads in the fifth row and the sixth row are in a full-on state, the current detection device detects that the current of the power output terminal is 50MA, and then it can be determined that the LED lamp beads in the fifth row and the sixth row are abnormal in operation.
In this embodiment, in order to detect the uniformity and the discreteness problem of LED lamp pearl work on the LED display element board, still include the step: and measuring the current value of each LED lamp bead on the LED display unit board when the LED lamp beads are lightened through a current detection device, and comparing the current values of each LED lamp bead when the LED lamp beads are lightened. The current detection device is used for detecting that the current of each LED lamp bead on the LED display unit board is in the lighted state, the current values detected when each LED lamp bead is in the lighted state are compared, and the discreteness of the LED lamp beads and the driving chip on the LED display unit board can be obtained through comparison. This step may be performed after step S220.
In this embodiment, in order to detect whether the signal forwarding and cascading functions of the LED display unit board are normal, the method further includes the steps of: and reading back the output interface signal of the LED display unit board through the signal read-back interface, and comparing the logic and time sequence relation of the input interface signal and the output interface signal of the LED display unit board. And reading back the output interface of the LED display unit board through the signal read-back interface, comparing the logic and time sequence relation with the control signal of the input interface of the LED display unit board, and judging whether the signal forwarding and cascading functions of the LED display unit board are normal. This step may be performed after step S210.
In this embodiment, in order to perform detection for different LED display unit panels, the method further includes the steps of: the detection device is operated through the man-machine interaction equipment, such as detection parameters are input. Different detection parameters can be input through the human-computer interaction equipment, and detection of different LED display unit boards can be achieved. The human-computer interaction equipment can be a touch display screen, detection parameters can be input through the touch display screen, and meanwhile, the detection condition of the LED display unit board can be displayed through the touch display screen. This step may be performed before step S210.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (4)
1. The LED display unit board detection device is characterized by comprising a power supply output terminal, a signal output interface and a main control board;
the signal output interface is connected to the main control board and used for controlling the on-off and the bright-dark state of each LED lamp bead on the LED display unit board by the main control board;
the LED display device comprises a power supply output terminal, a main control board and a power supply output terminal, wherein the power supply output terminal is provided with a current detection device and used for providing direct current power supply for an LED display unit board; the main control board is used for comparing the measured current value of the power output terminal and the designed current value and judging whether the LED display unit board works normally or not; the main control board is also used for measuring the current value of each LED lamp bead on the board when being lightened through the current measuring device and comparing the current values of each LED lamp bead when being lightened;
the main control board is also used for comparing the logic and time sequence relation of the input interface signal and the output interface signal of the LED display unit board;
the LED display unit board consists of a power input interface, a signal output interface, a row decoding driving circuit, a column driving circuit and two-dimensional array driving LED lamp beads formed by rows and columns; the working state of the LED display unit board is controlled by a signal input interface, and a signal output interface is used for controlling the forwarding driving of signals and the cascade connection of data signals;
detecting a 10 × 10 LED display unit board, wherein the total dark static current of the LED display unit board is 50MA, namely when all LED lamp beads on the LED display unit board are totally dark, the current of the LED display unit board is 50MA, 20MA current is needed when one LED lamp bead is bright, and 10MA current is needed when one LED lamp bead is semi-bright; when the LED display unit board is detected, when the LED lamp beads on the LED display unit board are completely dark, the current detection device detects that the current value of the circulating current of the power supply output terminal is 50 MA; when one LED lamp bead is fully bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 70 MA; when one LED lamp bead is semi-bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 60 MA; when the two LED lamp beads are fully bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 90 MA; when the LED display unit board is detected, the full-dark static current of the LED display unit board is detected firstly, and whether the LED display unit board works normally or not is judged by detecting the full-dark static current; and when each LED lamp bead on the LED display unit board is in a full-bright state or a half-bright state, the current value of the circulating current on the power output terminal is detected one by one, and is compared with a set current value, so that whether the work of each LED lamp bead is normal or not is judged.
2. The LED display unit board detection device of claim 1, further comprising a human-computer interaction device, wherein the human-computer interaction device is connected to the main control board, and the human-computer interaction device is used for operating the detection device.
3. A detection method for an LED display unit plate is characterized by comprising the following steps:
providing a direct current power supply for the LED display unit board through a power supply output terminal;
the on-off and the bright-dark state of the LED lamp beads on the LED display unit board are controlled through the signal output interface;
measuring the current value flowing through the power supply output terminal by a current detection device;
comparing the measured current value of the power output terminal with a designed current value, and judging whether the LED display unit board works normally;
measuring the current value of each LED lamp bead on the LED display unit board when the LED lamp beads are lighted through a current detection device, and comparing the current values of each LED lamp bead when the LED lamp beads are lighted;
reading back an output interface signal of the LED display unit board through the signal read-back interface, and comparing the logic and time sequence relation of the input interface signal and the output interface signal of the LED display unit board;
the LED display unit board consists of a power input interface, a signal output interface, a row decoding driving circuit, a column driving circuit and two-dimensional array driving LED lamp beads formed by rows and columns; the working state of the LED display unit board is controlled by a signal input interface, and a signal output interface is used for controlling the forwarding driving of signals and the cascade connection of data signals;
detecting a 10 × 10 LED display unit board, wherein the total dark static current of the LED display unit board is 50MA, namely when all LED lamp beads on the LED display unit board are totally dark, the current of the LED display unit board is 50MA, 20MA current is needed when one LED lamp bead is bright, and 10MA current is needed when one LED lamp bead is semi-bright; when the LED display unit board is detected, when the LED lamp beads on the LED display unit board are completely dark, the current detection device detects that the current value of the circulating current of the power supply output terminal is 50 MA; when one LED lamp bead is fully bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 70 MA; when one LED lamp bead is semi-bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 60 MA; when the two LED lamp beads are fully bright, the current detection device detects that the current value of the circulating current of the power supply output terminal is 90 MA; when the LED display unit board is detected, the full-dark static current of the LED display unit board is detected firstly, and whether the LED display unit board works normally or not is judged by detecting the full-dark static current; and when each LED lamp bead on the LED display unit board is in a full-bright state or a half-bright state, the current value of the circulating current on the power output terminal is detected one by one, and is compared with a set current value, so that whether the work of each LED lamp bead is normal or not is judged.
4. The LED display unit board inspection method according to claim 3, further comprising the steps of:
the detection device is operated through a man-machine interaction device.
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| CN101964166A (en) * | 2010-09-13 | 2011-02-02 | 南京通用电器有限公司 | Circuit for detecting dead pixel of LED display screen and method thereof |
| CN105336287A (en) * | 2014-08-06 | 2016-02-17 | 格力电器（武汉）有限公司 | Display screen testing method, device and system |
| CN206497714U (en) * | 2017-01-19 | 2017-09-15 | 昆山龙腾光电有限公司 | LED backlight detection circuit, drive circuit, module and liquid crystal display device |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964166A (en) * | 2010-09-13 | 2011-02-02 | 南京通用电器有限公司 | Circuit for detecting dead pixel of LED display screen and method thereof |
| CN105336287A (en) * | 2014-08-06 | 2016-02-17 | 格力电器（武汉）有限公司 | Display screen testing method, device and system |
| CN206497714U (en) * | 2017-01-19 | 2017-09-15 | 昆山龙腾光电有限公司 | LED backlight detection circuit, drive circuit, module and liquid crystal display device |
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Address after: 350007 five floor, eighty-eighth floor, 7 Jinzhou North Road, Jianxin Town, Cangshan District, Fuzhou, Fujian. Patentee after: Fuzhou Mingwei Information Technology Co.,Ltd. Address before: 350007 five floor, eighty-eighth floor, 7 Jinzhou North Road, Jianxin Town, Cangshan District, Fuzhou, Fujian. Patentee before: FUZHOU HAITIAN MICROELECTRONICS TECHNOLOGY CO.,LTD. |