CN117711286B - Display screen detection method and device and display screen - Google Patents

Display screen detection method and device and display screen Download PDF

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Publication number
CN117711286B
CN117711286B CN202410164993.XA CN202410164993A CN117711286B CN 117711286 B CN117711286 B CN 117711286B CN 202410164993 A CN202410164993 A CN 202410164993A CN 117711286 B CN117711286 B CN 117711286B
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led
detection
voltage
driving
leds
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CN117711286A (en
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赵建东
吴耿彬
陈文宇
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Hangzhou Shixin Technology Co ltd
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Hangzhou Shixin 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current

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

Abstract

The application relates to a display screen detection method and device and a display screen. The method comprises the following steps: acquiring the number of LEDs required by the current scanning line of the display unit; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity; if yes, state detection is carried out on the required LEDs of the current scanning line of the display unit. By adopting the method, the accuracy of the abnormality detection of the LED lamp can be improved.

Description

Display screen detection method and device and display screen
Technical Field
The present application relates to the field of display technologies, and in particular, to a display detection method and apparatus, and a display.
Background
Nowadays, the LED display screen is widely applied in the life of people due to the characteristics of low power consumption, low cost, environmental protection, durability and the like. However, when the LED display screen is in a severe environment such as high temperature and humidity for a long time, the LED lamp may be damaged, and then the LED lamp is opened. Under the condition that the LED lamp is opened, the damaged LED lamp cannot be normally lightened, and abnormal display can occur in other areas in the LED display screen, so that the image quality is influenced.
In the conventional technology, the open circuit of the LED lamp is detected by detecting the port voltage at the port of the constant current driving module circuit and comparing the port voltage with the preset voltage to judge whether the open circuit problem exists or not, and the judging result is sent to the constant current driving module to close the constant current output of the corresponding LED lamp. However, when the number of the LEDs that are lit in a row is large, the obtained port voltage of the constant current source is likely to be smaller than the preset voltage, if the open circuit detection of the LED lamp in the conventional technology is used, erroneous judgment is easily caused by comparing the preset voltage with the port voltage, so that the LED lamp that should be normally displayed is turned off for constant current output, and the display effect is reduced.
Therefore, the problem of low LED lamp abnormality detection accuracy still exists in the prior art.
Disclosure of Invention
Accordingly, it is necessary to provide a display screen detection method, a device and a display screen capable of improving the detection accuracy of the abnormality of the LED lamp.
In a first aspect, the present application provides a display screen detection method, where the display screen detection method includes:
Acquiring the number of LEDs required by the current scanning line of the display unit;
Determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity;
If yes, state detection is carried out on the required LEDs of the current scanning line of the display unit.
In one embodiment, the detecting the status of the required LED of the current scan line of the display unit includes:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
In one embodiment, the display screen detection method further includes:
and turning off the constant current output of the abnormal LED.
In one embodiment, the determining whether to perform the LED status detection according to the required number of LEDs and the preset number of lighting includes:
if the required LED quantity is smaller than or equal to the preset lighting quantity, LED state detection is required;
If the required LED quantity is larger than the preset lighting quantity, LED state detection is not needed.
In one embodiment, before determining whether to perform the LED status detection according to the required number of LEDs and the preset number of lighting, the method further includes:
Acquiring row power supply voltage, preset voltage, forward conduction voltage drop of an LED (light emitting diode) and circuit resistance value and LED constant current of a row driving control circuit;
calculating a first voltage based on the row supply voltage, the preset voltage and the forward conduction voltage drop of the LED;
Calculating a second voltage based on a product of a circuit resistance of the row drive control circuit and an LED constant current;
the preset lighting number of the row driving group is determined based on a ratio of the first voltage and the second voltage.
In one embodiment, when the display unit is a row driving group, the obtaining the required LED number of the current scan row of the display unit includes:
Acquiring display data of a current scanning line of the line driving group;
and determining the required LED number of the current scanning line of the line driving group based on the display data.
In one embodiment, the determining whether to perform the LED status detection according to the required number of LEDs and the preset number of lighting includes:
Obtaining the number of constant current output ports of a current driving circuit and the total number of LEDs of a current scanning line of a line driving group;
And determining the preset lighting number of the driving circuit based on the preset lighting number of the row driving group, the constant current output port number and the total number of LEDs.
In one embodiment, when the display unit is a driving circuit, the obtaining the required LED number of the current scan line of the display unit includes:
Acquiring display data of a current scanning line of the driving circuit;
And determining the required LED number of the current scanning line of the driving circuit based on the display data.
In a second aspect, the application provides a display screen detection device, which is applied to an LED display screen, wherein the display screen detection device comprises a control module and a detection module, the control module comprises an acquisition unit and a judgment unit, and the control module comprises:
The acquisition unit is used for acquiring the required LED quantity of the current scanning line of the display unit;
the judging unit is used for determining whether to detect the LED state according to the required LED quantity and the preset lighting quantity; if yes, the control detection module detects the state of the required LEDs of the current scanning line of the display unit.
In one embodiment, the detection module is further configured to:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
In one embodiment, the display screen detection apparatus further includes:
And the driving control module is used for closing the constant current output of the abnormal LED.
In a third aspect, the present application provides a display screen, including a row driving control circuit and a plurality of row driving groups, where the row driving control circuit is connected to one or more row driving groups, the row driving groups include one or more driving circuits and one or more LEDs connected to the driving circuits, the driving circuits include a constant current driving module, and the constant current driving module drives the LEDs connected thereto in a constant current manner, and the display screen further includes a detection control module, where the detection control module is connected to the row driving groups;
The detection control module is used for acquiring the required LED quantity of the current scanning line of the display unit; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity; if yes, state detection is carried out on the required LEDs of the current scanning line of the display unit.
In one embodiment, the display screen further includes an open circuit detection module, the open circuit detection module is connected with the detection control module, the open circuit detection module is further connected with the constant current output port of the constant current driving module, and the open circuit detection module is used for:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
In one embodiment, the constant current driving module is further configured to:
and turning off the constant current output of the abnormal LED.
In one embodiment, the detection control module is further configured to determine:
if the required LED quantity is smaller than or equal to the preset lighting quantity, LED state detection is required;
If the required LED quantity is larger than the preset lighting quantity, LED state detection is not needed.
In one embodiment, the detection control module is further configured to:
Acquiring row power supply voltage, preset voltage, forward conduction voltage drop of an LED (light emitting diode) and circuit resistance value and LED constant current of a row driving control circuit;
calculating a first voltage based on the row supply voltage, the preset voltage and the forward conduction voltage drop of the LED;
Calculating a second voltage based on a product of a circuit resistance of the row drive control circuit and an LED constant current;
The preset lighting number of the row driving group is determined based on a ratio of the first voltage and the second voltage.
In one embodiment, the detection control module further includes an acquisition module and a judgment module, the acquisition module is connected with the judgment module, and the judgment module is connected with the row driving group, wherein:
the acquisition module is used for: the display data of the current scanning line of the line driving group is acquired;
The judging module is used for: and determining the required LED number of the current scanning line of the line driving group based on the display data.
In one embodiment, the detection control module further includes an acquisition module and a judgment module, the acquisition module is connected with the judgment module, and the judgment module is connected with the driving circuit, wherein:
The acquisition module is used for: the display data of the current scanning line of the driving circuit are acquired;
The judging module is used for: and the display data is used for determining the required LED quantity of the current scanning line of the driving circuit.
In one embodiment, the detection control module is further configured to:
obtaining the number of constant current output ports of the current driving circuit and the total number of LEDs of the current scanning line of the line driving group;
And determining the preset lighting quantity of the driving circuit based on the preset lighting quantity of the row driving group, the constant current output port quantity and the total number of LEDs.
According to the display screen detection method and device and the display screen, the required LED number of the current scanning line of the display unit is obtained; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity; if yes, state detection is carried out on the required LEDs of the current scanning line of the display unit, whether the LED state detection is carried out or not can be determined according to the number of the required LED lamps, the influence on the LED state detection under the condition that the required LED lamps are too many is avoided, meanwhile, the detection is carried out under the condition that the number of the required LED lamps meets the condition, and therefore the effect of improving the accuracy of the abnormal detection of the LED lamps can be achieved.
Drawings
FIG. 1 is a block diagram of a conventional LED display system;
FIG. 2 is a flow chart of a method for detecting a display screen in one embodiment;
FIG. 3 is a flowchart of a method for detecting a display screen according to another embodiment;
FIG. 4 is a block diagram of a display screen detection apparatus in one embodiment;
FIG. 5 is a block diagram of a display screen in one embodiment;
FIG. 6 is a block diagram of a display screen in another embodiment;
Fig. 7 is a block diagram of a display screen in another embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Fig. 1 is a block diagram showing a conventional LED display system, which includes a row driving control circuit, a plurality of LED lamps, a plurality of constant current driving modules, and a plurality of open circuit detecting modules. The open circuit detection module detects the port voltage V DS at the output end of the constant current driving module, judges whether the LED lamp is open circuit according to the V DS in the working state of the LED lamp, informs the constant current driving module of the detection result, and the constant current driving module selects whether to close the constant current output according to the received detection result.
Under the condition that the LED lamp is open, the value of the port voltage V DS at the output end of the constant current driving module is equal to the port voltage of the constant current source, and the value of the port voltage of the constant current source is smaller, for example, smaller than 0.5V, and at the moment, V DS is smaller than 0.5V; and under the normal working condition of the LED lamp, V DS = VDD-the forward conduction voltage drop V F of the LED lamp-the voltage drop V H of the row driving control circuit.
Typically, the resistance R H of the row driving control circuit is small, and the voltage drop V H generated is related to the number of LED lamps that are lit in a row: assuming that the constant current required for lighting one LED lamp is I 0, when n LED lamps are lighted in one row at a time, the current flowing through the row driving control circuit is nxi 0, and the voltage drop generated by the row driving control circuit is nxi 0×RH, that is, when the number of the lighted LED lamps in one row is greater, the value of V H is greater.
Under normal conditions, the forward conduction voltage drop of the LED lamp is about 3V, and assuming that the power supply VDD provides a 5V supply voltage, when the LED lamp works normally and the number of the turned-on LED lamps is small, the voltage drop V H of the row driving control circuit is small, and the value of the port voltage V DS at the output end of the constant current driving module is usually greater than 1V, so that 1V can be set to be a preset voltage V OS for judging whether the LED lamp is open. However, as the requirement on low power consumption of the LED display screen is higher and higher, the voltage control of the power supply VDD is lower and lower, for example, as low as 4.2V, when the number of the LED lamps lighted in a row is larger, the value of V H is larger, and the port voltage of the constant current source is likely to be smaller than the preset voltage V OS and even is close to the voltage drop of the constant current source in the open circuit state, so that whether the LED lamps are open circuit is judged in the existing mode, misjudgment is easily caused, and the display effect is reduced.
In order to solve the problem of low detection accuracy of the abnormal LED lamp, as shown in fig. 2, the embodiment provides a display screen detection method, which includes the following steps:
Step S100, the required LED number of the current scanning line of the display unit is obtained.
The display screen detection in this embodiment may be performed in a row unit in the display driving array. The required number of LED lamps may be the number of LED lamps that need to be lit.
The required number of LED lamps for obtaining the current scan line may be determined based on display data, for example, the display data corresponding to the current scan line may be extracted from the display data, so as to determine the number of LED lamps to be turned on, where the display data may be stored in a control end of the display screen, may be stored in a storage module of the driving circuit, or may be stored in other available storage media, which is not limited herein.
Step S200, determining whether to perform LED status detection according to the required number of LEDs and the preset number of lighting.
The preset lighting number may be a threshold value of the lighting number of the LED lamps that may satisfy the LED status detection. According to the required LED lamp number and the preset lighting number, whether the LED state detection is required or not is determined, the required LED lamp number and the preset lighting number can be compared, and whether the LED state detection is required or not is determined based on a comparison result.
In order to avoid obtaining erroneous judgment results of detection abnormality, in this embodiment, by judging the required LED number, when the required LED lamp number of the current scanning line satisfies a threshold range defined by a preset lighting number, the LED lamp detection is performed again, so that the detection of the LED lamp state can be realized under the condition of avoiding the image quality from being damaged.
And step S300, if yes, detecting the state of the required LEDs of the current scanning line of the display unit.
The state detection can be performed on the required LED lamps of the current scanning line of the display unit, and further, the detection can be performed on the open-circuit voltage of the required LED lamps.
According to the display screen detection method provided by the embodiment, the required LED number of the current scanning line of the display unit is obtained; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity; if yes, state detection is carried out on the required LEDs of the current scanning line of the display unit, whether the LED state detection is carried out or not can be determined according to the number of the required LED lamps, the influence on the LED state detection under the condition that the required LED lamps are too many is avoided, meanwhile, the detection is carried out under the condition that the number of the required LED lamps meets the condition, and therefore the effect of improving the accuracy of the abnormal detection of the LED lamps can be achieved.
In one embodiment, the detecting the status of the required LED of the current scan line of the display unit includes:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
The detection of the working voltage of each required LED may be performed by detecting an open circuit voltage of a constant current output port of the corresponding required LED. It can be understood that in the case of an open LED, the measured port voltage of the constant current driving module should be equal to the port voltage of the constant current source, and in the case of normal operation of the LED, the port voltage is affected by the voltage drop of the LED itself and the voltage drop of the entire row driving control circuit, so that a result greater than the preset voltage is obtained. Thus, if the operating voltage of the LED is equal to the constant current source port voltage, it indicates that the LED has an open circuit, which can be regarded as abnormal state of the LED.
And determining the LED with the working voltage smaller than the preset voltage as a target LED with abnormal state, wherein the preset voltage can be the lowest voltage capable of distinguishing the normal LED from the abnormal LED and can be set based on the current driving line situation or actual requirements.
According to the display screen detection method, the working voltage of each required LED is detected; and determining the LED with the working voltage smaller than the preset voltage as an abnormal LED, and judging whether the LED has an open circuit or not to realize the state detection of the LED.
In one embodiment, the display screen detection method further includes:
and turning off the constant current output of the abnormal LED.
The constant current output of the abnormal LED is turned off, so that the problems such as a cross phenomenon and the like caused by the abnormality of the LED can be avoided, and the effects of improving the image quality and maintaining the current picture quality of the display screen to the maximum extent can be achieved.
In one embodiment, the determining whether to perform the LED status detection according to the required number of LEDs and the preset number of lighting includes:
if the required LED quantity is smaller than or equal to the preset lighting quantity, LED state detection is required;
If the required LED quantity is larger than the preset lighting quantity, LED state detection is not needed.
It can be appreciated that when the required number of LEDs is greater than or equal to the preset number of LEDs, the voltage drop of the row driving control circuit is easily excessive, which may cause the LEDs that should be determined to be operating normally to be misjudged as abnormal. By carrying out the LED state detection under the condition that the required LED quantity is smaller than the preset electric quantity, the influence of the overlarge required LED quantity on the LED state detection can be avoided.
In one embodiment, before determining whether to perform the LED status detection according to the required number of LEDs and the preset number of lighting, the method further includes:
Acquiring row power supply voltage, preset voltage, forward conduction voltage drop of an LED (light emitting diode) and circuit resistance value and LED constant current of a row driving control circuit;
calculating a first voltage based on the row supply voltage, the preset voltage and the forward conduction voltage drop of the LED;
Calculating a second voltage based on a product of a circuit resistance of the row drive control circuit and an LED constant current;
the preset lighting number of the row driving group is determined based on a ratio of the first voltage and the second voltage.
The row driving control circuit is used for controlling the on or off of the LEDs corresponding to the current scanning row of the display unit. The preset voltage may be a preset voltage for judging whether the state is abnormal as described above. The forward conduction voltage drop of the LED, the circuit resistance value of the row driving control circuit and the LED constant current can be obtained based on the previous detection, can be obtained according to factory parameters, and can be obtained through other existing parameter obtaining modes.
The following is a derivation process of the preset lighting amount calculation:
According to a voltage formula output by a constant current port under the condition that the LED lamp works normally, namely V DS = VDD-voltage drop V F of forward conduction of the LED lamp-voltage drop V H of a row driving control circuit, the voltage drop V H of the row driving control circuit can be obtained
VDS=VDD-VF-n×I0×RH
Wherein VDD is the row supply voltage of the current scan row of the display unit, V DS is the port voltage of the constant current output port, V F is the forward conduction voltage drop of the LEDs, n is the number of LEDs that are lit, I 0 is the constant current of a single LED, and R H is the circuit resistance of the row driving control circuit.
In order to perform detection of the port voltage normally, V DS under normal operation is required to be equal to or greater than a preset voltage, namely:
VDD-VF-n×I0×RH≥VOS
Wherein V OS is a preset voltage; it can be deduced that the maximum number of LEDs is lit on the premise that the open circuit detection is not misjudged:
Based on the above formula, the maximum number of LED lighting that will not generate erroneous judgment can be calculated as the preset lighting number by the power supply voltage of the driving row, the preset voltage, the forward conduction voltage drop of the LED, and the circuit resistance value and the LED constant current of the row driving control circuit.
It will be appreciated that, since the value of the parameter required for the preset number of lights may be static or dynamically changing, in the case of dynamic parameter values, the calculation of the preset number of lights may be performed in a fixed period, for example, the calculation of the preset number of lights may be performed before or after each n LED status detections, and in the case of static parameter values, the calculation may be performed in advance, for example, the setting of a fixed parameter may be performed between display screen operations.
According to the display screen detection method provided by the embodiment, the preset lighting quantity is calculated through the line power supply voltage, the preset voltage, the forward conduction voltage drop of the LED lamps, the circuit resistance value of the line driving control circuit and the LED constant current, the lighting lamp quantity which is not misjudged can be calculated according to the current condition of the current scanning line, and the range of the LED lighting quantity can be determined to a large extent so as to ensure the normal detection of the LEDs.
In one embodiment, when the display unit is a row driving group, the obtaining the required LED number of the current scan row of the display unit includes:
Acquiring display data of a current scanning line of the line driving group;
and determining the required LED number of the current scanning line of the line driving group based on the display data.
The display data may be data that needs to be displayed by a current scanning line of the line driving group at a current time, and in a specific embodiment, the display data may be gray-scale data.
The number of required LEDs of the current scan line of the line driving group is determined based on the display data, for example, if "1" is used to indicate lighting in the display data of the current scan line of the line driving group, the number of "1" in the display data is counted to determine the number of required LEDs.
In one embodiment, the determining whether to perform the LED status detection according to the required number of LEDs and the preset number of lighting includes:
Obtaining the number of constant current output ports of a current driving circuit and the total number of LEDs of a current scanning line of a line driving group;
And determining the preset lighting number of the driving circuit based on the preset lighting number of the row driving group, the constant current output port number and the total number of LEDs.
The constant current output ports of each current driving circuit respectively correspond to the constant current output of one LED, so that the number of the constant current output ports of each current driving circuit can be regarded as the total number of LEDs driven by the current driving circuit; the total number of LEDs of the current scan line of the line driving group is the number of all LEDs of the current scan line of the driving group.
The determining the preset lighting number of the driving circuit based on the preset lighting number of the row driving group, the constant current output port number and the total number of the LEDs may be calculating the preset lighting number under the corresponding constant current output port number according to a ratio of the preset lighting number of the row driving group to the total number of the LEDs. Under the condition that the number of the constant current output ports of each driving circuit is the same, the calculated preset lighting number can be updated to all the driving circuits, and each driving circuit can judge whether the LED state detection needs to be carried out on the LEDs under the driving circuits based on the preset lighting number.
According to the display screen detection method, statistics and judgment of the required LED lamp numbers are issued to the driving circuits, and the required LED lamp numbers can be obtained under the condition that the control end cannot obtain the required LED lamp numbers by counting the required LED lamp numbers of each driving circuit, so that the required LED lamp numbers are obtained under the condition of different structures.
In one embodiment, when the display unit is a driving circuit, the obtaining the required LED number of the current scan line of the display unit includes:
Acquiring display data of a current scanning line of the driving circuit;
And determining the required LED number of the current scanning line of the driving circuit based on the display data.
The display data may be data that needs to be displayed by the driving circuit at the current moment in the current scanning line, and in a specific embodiment, the display data may be gray-scale data.
The number of required LEDs of the current scan line of the driving circuit is determined based on the display data, for example, if the display data of the current scan line of the driving circuit is lighted by using a "1", the number of "1" in the display data is counted to determine the number of required LEDs.
The application further provides a detailed embodiment for more clearly explaining the technical scheme of the application. In one embodiment, as shown in fig. 3, there is provided a display screen detection method, including:
Detecting the number n 0 of LEDs to be lighted in the next row;
Before the LEDs of the row are lighted, judging whether n 0 is less than or equal to a threshold value n or not; if yes, the open circuit detection enabling is effective and works normally; and sending an open-circuit enabling signal to detect the state of the LED, and closing constant current driving of the target LED when the target LED with abnormal state is detected; if not, the open circuit detection enabling is invalid, and the open circuit detection is suspended.
The LED of the current row is illuminated.
Wherein the threshold n may be calculated according to the following formula:
Wherein n is the number of the LED lamps which are lighted; VDD is the row supply voltage for the current scan row; v OS is a preset voltage; v F is the forward conduction voltage drop of the LED lamp; i 0 is the constant current of a single LED lamp; r H is the circuit resistance of the row driving control circuit.
When the control end cannot timely acquire the number n 0 of the LEDs required to be lightened in one row of the LED display system due to different system structures and the like, the display data of each driving circuit can be acquired and counted, and one or more driving circuits are used as units for detecting the states of the LEDs respectively.
Taking whether the LED state detection and judgment are performed in a single driving circuit as an example, the current constant current output port number of the driving circuit, the current scanning line LED total number of the line driving group and the current scanning line maximum lighting quantity threshold value of the line driving group can be obtained, and the lighting LED lamp threshold value n' of the current driving circuit can be obtained by calculating based on the following formula:
Where n is the maximum lighting number threshold of the current row, and n' is the threshold of the lighting LED lamp of the current driving circuit.
According to the display screen detection method, the required LED number of the current scanning line of the display unit is obtained; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity; if yes, carrying out state detection on the required LEDs of the current scanning line of the display unit, determining whether to carry out LED state detection according to the number of the required LEDs, avoiding influencing the LED state detection under the condition that the required LEDs are too many, and simultaneously carrying out detection under the condition that the number of the required LEDs meets the condition, thereby achieving the effect of improving the accuracy of abnormal detection of the LEDs; detecting the working voltage of each required LED; the LED with the working voltage smaller than the preset voltage is determined to be an abnormal LED, whether the LED has an open circuit or not can be judged, and the state detection of the LED is realized; the LED state detection is carried out when the required LED quantity is smaller than or equal to the preset lighting quantity, and the LED state detection is not carried out when the required LED quantity is larger than the preset lighting quantity, so that the influence of the excessive required LED quantity on the LED state detection can be avoided; the preset lighting quantity is calculated through the line power supply voltage, the preset voltage, the forward conduction voltage drop of the LED lamp, the circuit resistance value of the line driving control circuit and the LED constant current, the lighting lamp quantity which is not misjudged can be calculated according to the current condition of the current scanning line, and the range of the LED lighting quantity can be determined to a large extent so as to ensure the normal detection of the LED; through the statistics and the judgement with the demand LED quantity issue to drive circuit go on, can avoid because of the too big data volume of display data, lead to the untimely situation of statistics, can confirm more soon whether need carry out the LED state detection, reach the effect that improves the timeliness of LED state detection.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a display screen detection device for realizing the display screen detection method. The implementation of the solution provided by the device is similar to the implementation described in the above method, so the specific limitation of the embodiment of the display screen detection device or devices provided below may be referred to the limitation of the display screen detection method hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 4, a display screen detection device is provided and applied to an LED display screen, where the display screen detection device includes a control module 31 and a detection module 32, and the control module 31 includes an acquisition unit 311 and a judgment unit 312, where:
an obtaining unit 311, configured to obtain a required LED number of a current scan line of the display unit;
A judging unit 312, configured to determine whether to perform LED status detection according to the required number of LEDs and a preset lighting number; if yes, the control detection module 32 performs status detection on the required LED of the current scan line of the display unit.
In one embodiment, the detection module 32 is further configured to:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
In one embodiment, the display screen detection apparatus further includes:
And the driving control module is used for closing the constant current output of the abnormal LED.
Based on the same inventive concept, the embodiment of the application also provides a display screen for realizing the display screen detection method. The implementation of the solution provided by the display screen is similar to the implementation described in the above method, so the specific limitation in one or more embodiments of the display screen provided below may be referred to the limitation of the display screen detection method hereinabove, and will not be repeated here.
In one embodiment, as shown in fig. 5, there is provided a display screen, including a row driving control circuit 1 and a plurality of row driving groups 2, the row driving control circuit 1 is connected with one or more of the row driving groups 2, the row driving groups 2 include one or more driving circuits 21 and one or more LEDs 22 connected with the driving circuits 21, the driving circuits include a plurality of constant current driving modules 211, the constant current driving modules 211 perform constant current driving on the LEDs 22 connected therewith, the display screen further includes a detection control module 3, and the detection control module 3 is connected with the row driving groups 2;
The detection control module 3 is used for acquiring the required LED quantity of the current scanning line of the display unit; determining whether to perform LED state detection according to the required number of LEDs 22 and the preset lighting number; if so, the status detection is performed on the required LEDs 22 of the current scan line of the display unit.
In one embodiment, the display screen further includes an open circuit detection module 33, where the open circuit detection module 33 is connected to the detection control module 3, the open circuit detection module 33 is further connected to the constant current output port of the constant current driving module 211, and the open circuit detection module 33 is configured to:
detecting the operating voltage of each of the demand LEDs 22;
the LED22 whose operating voltage is less than the preset voltage is determined as an abnormal LED.
Illustratively, the open circuit detection module 33 may be disposed within the drive circuit 21;
In one embodiment, the constant current driving module 211 is further configured to:
and turning off the constant current output of the abnormal LED.
Illustratively, the open circuit detection module 33 returns the detection result to the constant current drive module 211 to cause the constant current drive module 211 to perform a corresponding operation according to the detection result.
In one embodiment, the detection control module 3 is further configured to determine:
If the required number of LEDs 22 is less than or equal to the preset lighting number, LED state detection is required;
if the required number of LEDs 22 is greater than the preset number of LEDs, no LED status detection is required.
As shown in fig. 6, the detection control module 3 may be connected to the row driving group 2, and the acquisition module and the judgment module are not shown in the figure. When the display screen further includes the open circuit detection module 33, the connection relationship of the open circuit detection module and the constant current drive module 211 may be set with reference to the connection relationship as shown in fig. 6.
In one embodiment, the detection control module 3 is further configured to:
Acquiring row power supply voltage, preset voltage, forward conduction voltage drop of an LED (light emitting diode) and circuit resistance value and LED constant current of a row driving control circuit;
calculating a first voltage based on the row supply voltage, the preset voltage and the forward conduction voltage drop of the LED;
Calculating a second voltage based on a product of a circuit resistance of the row drive control circuit and an LED constant current;
The preset lighting number of the row driving group 2 is determined based on a ratio of the first voltage and the second voltage.
In one embodiment, the detection control module 3 further includes an acquisition module and a judgment module, where the acquisition module is connected to the judgment module, and the judgment module is connected to the row driving group 2, where:
the acquisition module is used for: for acquiring display data of a current scan line of the line driving group 2;
the judging module is used for: the required number of LEDs 22 for the current scanning line of the line driving group 2 is determined based on the display data.
As shown in fig. 7, the row driving group 2 may include a plurality of driving circuits 21, each driving circuit 21 being respectively connected to one of the detection control modules 3, and the acquisition module and the judgment module are not shown in the figure. Specifically, the constant current driving module 211 and the open circuit detecting module 33 in each driving circuit 21 are respectively connected to the detection control module 3, and the connection relationship between the open circuit detecting module 33 and the constant current driving module 211 is shown with reference to fig. 7. In one embodiment, the detection control module 3 further includes an acquisition module and a judgment module, the acquisition module is connected with the judgment module, and the judgment module is connected with the driving circuit 21, wherein:
the acquisition module is used for: for acquiring display data of a current scanning line of the driving circuit 21;
The judging module is used for: the required number of LEDs 22 for the current scan line of the driving circuit 21 is determined based on the display data.
In one embodiment, the detection control module 3 is further configured to:
acquiring the number of constant current output ports of the current driving circuit 21 and the total number of LEDs 22 of the current scanning line of the line driving group 2;
The preset lighting number of the driving circuit 21 is determined based on the preset lighting number of the row driving group 2, the constant current output port number, and the total number of the LEDs 22.
The display screen detection device and each module in the display screen can be realized in whole or in part by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as Static Random access memory (Static Random access memory AccessMemory, SRAM) or dynamic Random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (19)

1. The display screen detection method is characterized by comprising the following steps of:
Acquiring the number of LEDs required by the current scanning line of the display unit;
calculating the maximum number of LED lighting without erroneous judgment through the row power supply voltage, the preset voltage, the forward conduction voltage drop of the LEDs, the circuit resistance value of the row driving control circuit and the LED constant current, and taking the maximum number as the preset lighting number; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity;
If yes, state detection is carried out on the required LEDs of the current scanning line of the display unit.
2. The method for detecting a display screen according to claim 1, wherein the detecting a status of the required LED of the current scan line of the display unit includes:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
3. The display screen detection method according to claim 2, characterized in that the display screen detection method further comprises:
and turning off the constant current output of the abnormal LED.
4. The method of claim 1, wherein determining whether to perform LED status detection according to the required number of LEDs and a preset number of LEDs comprises:
if the required LED quantity is smaller than or equal to the preset lighting quantity, LED state detection is required;
If the required LED quantity is larger than the preset lighting quantity, LED state detection is not needed.
5. The method for detecting a display screen according to any one of claims 1 to 4, wherein the determining whether to perform LED status detection according to the required number of LEDs and a preset number of lighting further includes:
Acquiring row power supply voltage, preset voltage, forward conduction voltage drop of an LED (light emitting diode) and circuit resistance value and LED constant current of a row driving control circuit;
calculating a first voltage based on the row supply voltage, the preset voltage and the forward conduction voltage drop of the LED;
Calculating a second voltage based on a product of a circuit resistance of the row drive control circuit and an LED constant current;
the preset lighting number of the row driving group is determined based on a ratio of the first voltage and the second voltage.
6. The method of claim 5, wherein when the display unit is a row driving group, the obtaining the required number of LEDs of the current scan row of the display unit includes:
Acquiring display data of a current scanning line of the line driving group;
and determining the required LED number of the current scanning line of the line driving group based on the display data.
7. The method of claim 5, wherein determining whether to perform LED status detection according to the required number of LEDs and a preset number of LEDs comprises:
Obtaining the number of constant current output ports of a current driving circuit and the total number of LEDs of a current scanning line of a line driving group;
And determining the preset lighting number of the driving circuit based on the preset lighting number of the row driving group, the constant current output port number and the total number of LEDs.
8. The method of claim 7, wherein when the display unit is a driving circuit, the obtaining the required number of LEDs of the current scan line of the display unit includes:
Acquiring display data of a current scanning line of the driving circuit;
And determining the required LED number of the current scanning line of the driving circuit based on the display data.
9. The utility model provides a display screen detection device, is applied to the LED display screen, its characterized in that, display screen detection device includes control module and detection module, control module includes acquisition unit, judgement unit, wherein:
The acquisition unit is used for acquiring the required LED quantity of the current scanning line of the display unit;
the judging unit is used for calculating the maximum number of LED lighting which does not generate erroneous judgment through the row power supply voltage, the preset voltage, the forward conduction voltage drop of the LEDs, the circuit resistance value of the row driving control circuit and the LED constant current, and taking the maximum number as the preset lighting number; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity; if yes, the control detection module detects the state of the required LEDs of the current scanning line of the display unit.
10. The display screen detection apparatus according to claim 9, wherein the detection module is further configured to:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
11. The display screen detection apparatus according to claim 10, wherein the display screen detection apparatus further comprises:
And the driving control module is used for closing the constant current output of the abnormal LED.
12. The display screen comprises a row driving control circuit and a plurality of row driving groups, wherein the row driving control circuit is connected with one or more row driving groups, the row driving groups comprise one or more driving circuits and one or more LEDs connected with the driving circuits, the driving circuits comprise constant current driving modules, and the constant current driving modules are used for driving the LEDs connected with the driving circuits in a constant current mode, and the display screen is characterized by further comprising a detection control module, wherein the detection control module is connected with the row driving groups;
the detection control module is used for acquiring the required LED quantity of the current scanning line of the display unit; calculating the maximum number of LED lighting without erroneous judgment through the row power supply voltage, the preset voltage, the forward conduction voltage drop of the LEDs, the circuit resistance value of the row driving control circuit and the LED constant current, and taking the maximum number as the preset lighting number; determining whether to perform LED state detection according to the required LED quantity and the preset lighting quantity; if yes, state detection is carried out on the required LEDs of the current scanning line of the display unit.
13. The display screen of claim 12, further comprising an open circuit detection module coupled to the detection control module, the open circuit detection module further coupled to the constant current output port of the constant current drive module, the open circuit detection module configured to:
detecting the working voltage of each required LED;
And determining the LED with the working voltage smaller than the preset voltage as an abnormal LED.
14. The display screen of claim 13, wherein the constant current drive module is further configured to:
and turning off the constant current output of the abnormal LED.
15. The display screen of claim 12, wherein the detection control module is further configured to determine:
if the required LED quantity is smaller than or equal to the preset lighting quantity, LED state detection is required;
If the required LED quantity is larger than the preset lighting quantity, LED state detection is not needed.
16. The display screen of any one of claims 12 to 15, wherein the detection control module is further configured to:
Acquiring row power supply voltage, preset voltage, forward conduction voltage drop of an LED (light emitting diode) and circuit resistance value and LED constant current of a row driving control circuit;
calculating a first voltage based on the row supply voltage, the preset voltage and the forward conduction voltage drop of the LED;
Calculating a second voltage based on a product of a circuit resistance of the row drive control circuit and an LED constant current;
The preset lighting number of the row driving group is determined based on a ratio of the first voltage and the second voltage.
17. The display screen of claim 16, wherein the detection control module further comprises an acquisition module and a judgment module, the acquisition module being coupled to the judgment module, the judgment module being coupled to the row drive group, wherein:
the acquisition module is used for: the display data of the current scanning line of the line driving group is acquired;
The judging module is used for: and determining the required LED number of the current scanning line of the line driving group based on the display data.
18. The display screen of claim 16, wherein the detection control module further comprises an acquisition module and a judgment module, the acquisition module being connected to the judgment module, the judgment module being connected to the drive circuit, wherein:
The acquisition module is used for: the display data of the current scanning line of the driving circuit are acquired;
The judging module is used for: and the display data is used for determining the required LED quantity of the current scanning line of the driving circuit.
19. The display screen of claim 18, wherein the detection control module is further configured to:
obtaining the number of constant current output ports of the current driving circuit and the total number of LEDs of the current scanning line of the line driving group;
And determining the preset lighting quantity of the driving circuit based on the preset lighting quantity of the row driving group, the constant current output port quantity and the total number of LEDs.
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