CN108391343B

CN108391343B - LED detection device, detection system and detection method

Info

Publication number: CN108391343B
Application number: CN201810174521.7A
Authority: CN
Inventors: 刘建福
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2018-03-02
Filing date: 2018-03-02
Publication date: 2021-01-22
Anticipated expiration: 2038-03-02
Also published as: CN108391343A

Abstract

The embodiment of the invention provides an LED detection device, a detection system and a detection method. The detection device comprises at least one induction resistor and a detection circuit; at least one LED module is electrically connected with the first end of a corresponding induction resistor; the detection circuit is electrically connected with each induction resistor; the detection circuit is used for detecting the induction current of each induction resistor and determining the backlight working state of the corresponding LED module according to the induction current. The embodiment of the invention can be applied to most LED circuit architectures to overcome the limitation of the existing LED detection device on the application range.

Description

LED detection device, detection system and detection method

Technical Field

The invention relates to the technical field of LEDs, in particular to an LED detection device, a detection system and a detection method.

Background

The liquid crystal display module consisting of the liquid crystal screen and the backlight source is increasingly widely applied in military and industry. Since the lcd panel does not emit Light, in order to clearly see the content displayed on the panel, an LED (Light Emitting Diode) is usually used as a backlight source of the display panel to provide backlight, and the normal operation of the LED is very important for the function of the lcd module.

In order to grasp the working state of the LED in time, the conventional military liquid crystal display module and the industrial liquid crystal display module are required to have a function of monitoring the state of each functional module, particularly the LED, so that the working state of the LED can be monitored in real time, and the backlight fault of the LED can be found in time.

The inventor of the present invention has noticed that a prior art employs a comparison amplifying circuit and a monitoring circuit to detect the backlight operation state of the LED, and can deduce the fault location and type through the information returned from the monitoring point. However, the technology is only applicable to the LED driving circuit in which the negative electrodes of the LED lamps form a loop with respect to the ground, and cannot be applied to the LED driving circuit in which the negative electrodes of other LED lamps form a loop with respect to the ground.

Disclosure of Invention

The invention provides an LED detection device, a detection system and a detection method aiming at the defects of the existing mode, and aims to solve the problem that the application range is small when the working state of LED backlight is detected in the prior art.

The embodiment of the invention provides an LED detection device according to a first aspect, which is used for detecting the backlight working state of an LED module, and comprises at least one sensing resistor and a detection circuit;

each LED module is electrically connected with a corresponding induction resistor; the detection circuit is electrically connected with each induction resistor;

the detection circuit is used for detecting the induction current of each induction resistor and determining the backlight working state of the corresponding LED module according to the induction current.

Further, the detection circuit includes a current detection unit and a control unit;

the input end of the current detection unit is electrically connected with each induction resistor, and the output end of the current detection unit is electrically connected with the control unit;

the current detection unit is used for detecting the induction voltage of the corresponding induction resistor, obtaining the corresponding induction current according to the induction voltage, converting the induction current into analog voltage and outputting the analog voltage to the control unit;

and the control unit is used for determining the backlight working state of the corresponding LED module according to the analog voltage.

Furthermore, the number of the current detection units is at least one, and the input end of each current detection unit is electrically connected with the corresponding at least one induction resistor.

Embodiments of the present invention also provide, according to a second aspect, an LED detection system, including at least one LED module, a driving circuit, and a detection apparatus as provided by the above first aspect of the embodiments of the present invention;

the first end of each LED module is electrically connected with the driving circuit, and the second end of each LED module is electrically connected with a corresponding induction resistor in the detection device;

the driving circuit is used for driving at least one LED module, and the detection device is used for detecting the backlight working state of at least one LED module.

Further, each LED module comprises N LEDs connected in series, wherein N is a positive integer;

the first end of the LED module is the negative electrode of the 1 st LED, and the second end of the LED module is the positive electrode of the Nth LED.

Further, when there is more than one LED module, the driving circuit is also electrically connected with a boosting circuit, and the boosting circuit is used for boosting the output voltage of the driving circuit to drive the more than one LED module to work;

the booster circuit comprises an energy storage unit, a rectifying unit and a switch unit;

the first end of the energy storage unit is electrically connected with a first power supply outside the detection device, and the second end of the energy storage unit is electrically connected with the first end of the rectification unit; the second end of the rectifying unit is electrically connected with the second end of each induction resistor and the first end of the switch unit; and the second end of the switch unit is electrically connected with the driving circuit, and the third end of the switch unit is grounded.

The embodiment of the present invention further provides, according to a third aspect, an LED detection method, which is executed by the LED detection apparatus provided in the above first aspect or the LED detection apparatus in the LED detection system provided in the second aspect, in the embodiment of the present invention, and the method includes:

detecting an induced current of the at least one induction resistor;

and determining the backlight working state of the corresponding LED module according to the induced current.

Further, the detecting an induced current of the at least one sensing resistor includes: and detecting the induction voltage of the induction resistor, and obtaining corresponding induction current according to the induction voltage.

Further, the determining the backlight working state of the corresponding LED module according to the induced current includes: and converting the induced current into analog voltage, and determining the backlight working state of the corresponding LED module according to the analog voltage.

Further, determining the backlight working state of the corresponding LED module according to the analog voltage includes:

judging whether the analog voltage meets a preset working condition, and if so, determining that the backlight working state of the LED module is normal; and if not, determining that the backlight working state of the LED module is abnormal.

Compared with the prior art, the embodiment of the invention at least has the following beneficial effects:

1) the circuit can be applied to most LED circuit structures (circuit structures of LED modules not to the ground) comprising a driving circuit, a booster circuit and the like, and can detect the working states of a plurality of LED modules simultaneously, thereby effectively enlarging the application range and overcoming the limitation of the application range of the prior art;

2) through the matching of the detection result and the preset working condition, the working state of the LED module can be accurately judged, and more effective reference indexes are provided for maintaining the normal work of the LED module.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic frame diagram illustrating a structure of an LED detection device and a connection relationship between the LED detection device and an LED module and a driving circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a sensing resistor, an LED module, and a driving circuit in an LED detection apparatus according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a detection circuit in the LED detection apparatus according to an embodiment of the present invention;

fig. 4 is a schematic flow chart of an LED detection method according to an embodiment of the present invention.

In the figure:

100 is an LED module, 101 is a first LED module, 102 is a second LED module, 103 is a third LED module, and 104 is a fourth LED module;

200 is a driving circuit;

300 is an LED detection device, 301 is a sense resistor, and 302 is a detection circuit.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Example one

In order to solve the problem that the working state of an LED cannot be detected in time or the application range is small in the prior art, an embodiment of the present invention provides an LED detection device, where fig. 1 shows a frame schematic diagram of a structure of the detection device and a connection relationship between the detection device and an LED module and a driving circuit outside the detection device, the detection device is used to detect the backlight working state of at least one LED module 100, and the LED module 100 can be driven by the driving circuit 200. As shown in fig. 1, the LED detecting device 300 includes at least one sensing resistor 301 and a detecting circuit 302.

Each LED module 100 is electrically connected to a corresponding one of the sensing resistors 301, and the detection circuit 302 is electrically connected to each sensing resistor 301.

The detection circuit 302 is configured to detect an induced current of each sensing resistor 301, and determine a backlight operating state of the corresponding LED module 100 according to the induced current.

By applying the embodiment of the invention, the backlight working state of the LED can be detected in time, and the LED module 100 detected by the embodiment of the invention is not grounded, so that the embodiment of the invention can also be applied to most LED circuit architectures (circuit architectures with the negative electrode of the LED module 100 not facing the ground) to overcome the limitation of the conventional LED detection device 300 in detecting the LED backlight working state.

Preferably, the detection circuit 302 includes a current detection unit and a control unit, an input end of the current detection unit is electrically connected to each of the sensing resistors 302, and an output end of the current detection unit is electrically connected to the control unit; the power input terminal of the current detection unit is electrically connected to a second power supply outside the LED detection device 300, and the ground terminal is grounded.

The current detection unit is configured to detect an induced voltage of the corresponding inductive resistor 301, obtain a corresponding induced current according to the induced voltage, convert the induced current into an analog voltage, and output the analog voltage to the control unit, or directly convert the detected induced voltage into an analog voltage and output the analog voltage to the control unit. The second power supply supplies power to the current detection unit.

As can be seen from the foregoing, the magnitude of the analog voltage corresponds to the magnitude of the induced current of the LED module 100, and the backlight operation state of the LED module 100 can be determined by the induced current of the LED module 100, so that the analog voltage output by the current detection unit can also reflect the backlight operation state simulated by the LED.

In a preferred embodiment, there is at least one current detection unit, an input end of each current detection unit may be electrically connected to the corresponding at least one sensing resistor 301, and each sensing resistor 301 is electrically connected to only one current detection unit; that is, each current detection unit may detect the induced current of only one sense resistor 301, or may detect the induced currents of a plurality of sense resistors 301 at the same time.

When a current detection unit is used to detect the induced current of a plurality of (more than one) induction resistors 301, a plurality of groups of input ends are arranged on the current detection unit, each group of input ends is respectively connected with one induction resistor 301 and the two ends of the induction resistor 301 to collect the voltage difference between the two ends of the induction resistor 301, and the voltage difference is the induced voltage of the induction resistor 301.

Preferably, the current detection unit in the embodiment of the present invention may be a current detection chip, and the specific structure of the current detection chip is not limited in the embodiment of the present invention, and the current detection chip may be of various existing models and structures, so as to implement the function of detecting current or voltage, which is not described herein again.

Preferably, a Converter, such as an ADC (Analog-to-Digital Converter), for converting the induced current or the induced voltage into an Analog voltage is disposed in the current detection unit in the embodiment of the present invention.

The control unit in the embodiment of the present invention is configured to determine a backlight operating state of the corresponding LED module 100 according to the analog voltage; specifically, the control unit may be configured to determine whether the analog voltage meets a preset working condition, and if so, determine that the measured backlight working state of the LED module 100 is normal; if not, the backlight working state of the LED module 100 is determined to be abnormal.

Preferably, the preset operating condition may specifically be a preset voltage threshold or a preset voltage threshold range, and correspondingly, the control unit in the embodiment of the present invention is specifically configured to:

when the preset working condition is the preset voltage threshold, judging whether the analog voltage meets the preset working condition, including: judging whether the analog voltage is greater than or equal to the preset voltage threshold, if so, determining that the backlight working state of the LED module 100 is normal, and if not, determining that the backlight working state of the LED module 100 is abnormal;

when the preset working condition is the preset voltage threshold range, judging whether the analog voltage meets the preset working condition or not, wherein the judging step comprises the following steps: whether the analog voltage is within the preset voltage threshold range is judged, namely whether the analog voltage is larger than or equal to the minimum value of the threshold range and smaller than or equal to the maximum value of the threshold range, if yes, the measured backlight working state of the LED module 100 is determined to be normal, and if not, the measured backlight working state of the LED module 100 is determined to be abnormal.

Through the setting of the preset working conditions, whether the LED module 100 works normally or not and whether a backlight fault exists can be determined more accurately, so that the LED module 100 with the backlight fault can be maintained in time.

Further preferably, the control unit in the embodiment of the present invention may be further configured to determine the current brightness or chromaticity of the LED module 100 according to the specific value of the analog voltage, and feed back the brightness or chromaticity in real time, so as to more accurately know the operating state of the LED module 100 and the real-time change condition of the operating state, and then perform corresponding setting and adjustment according to the real-time change condition and the use requirement.

Further, the Control Unit in the embodiment of the present invention may be an MCU (Micro Control Unit, Micro Control Unit or single chip microcomputer), or other Control chip or Control circuit capable of implementing the above functions.

In summary, the first embodiment of the present invention has at least the following advantages:

1) the circuit can be applied to most LED circuit structures (circuit structures of the LED modules 100 not facing the ground) including the driving circuit 200, the booster circuit and the like, and can simultaneously detect the working states of the LED modules 100, thereby effectively expanding the application range and overcoming the limitation of the application range of the prior art;

2) by matching the detection result with the preset working condition, the working state of the LED module 100 can be accurately determined, and a more effective reference index is provided for maintaining the normal operation of the LED module 100.

Example two

Based on the same inventive concept, the second embodiment of the present invention provides an LED detection system, and fig. 1 also shows a schematic structural framework of the detection system, as shown in fig. 1, the detection system includes at least one LED module 100, a driving circuit 200, and an LED detection apparatus 300 provided in the first embodiment.

A first end of each LED module 100 is electrically connected to the driving circuit 200, and a second end is electrically connected to a corresponding one of the sensing resistors 301 in the LED detecting device 300; the power input terminal of the driving circuit is electrically connected to the first power supply outside the LED detection device 300, and the ground terminal is grounded.

The driving circuit 200 is used for driving at least one LED module 100, and the first power supply supplies power to the driving circuit 200; the LED detecting device 300 is used for detecting the backlight working state of at least one LED module 100. Preferably, as shown in fig. 2, the at least one LED module may include a first LED module 101, a second LED module 102, a third LED module 103, and a fourth LED module 104.

Preferably, the driving circuit 200 in the embodiment of the present invention may adopt an LED driving chip, a first end of each LED module 100 is electrically connected to the LED driving chip, a power input end of the LED driving chip is electrically connected to a first power supply, and a ground end of the LED driving chip is grounded. The specific structure of the LED driving chip is not limited in the embodiments of the present invention, and the LED detection apparatus 300 provided in the embodiments of the present invention is suitable for application scenarios of existing LED driving chips of various models and structures.

In a preferred embodiment, each LED module 100 includes N LEDs connected in series, where N is a positive integer, in this case, the first end of the LED module 100 is the cathode of the 1 st LED, and the second end of the LED module 100 is the anode of the nth LED. The embodiment of the invention can be suitable for detecting any number of LEDs.

In a preferred embodiment, when there are more than one LED modules 100, the detection system further includes a voltage boosting circuit, the driving circuit 200 is further electrically connected to the voltage boosting circuit, and the voltage boosting circuit is configured to boost the output voltage of the driving circuit 200 to drive the more than one LED modules 100 to operate.

Preferably, the boost circuit comprises an energy storage unit, a rectifying unit and a switching unit; the first end of the energy storage unit is electrically connected with the first power supply, and the second end of the energy storage unit is electrically connected with the first end of the rectifying unit; the second end of the rectifying unit is electrically connected with the second end of each induction resistor 301 and the first end of the switch unit; the second terminal of the switch unit is electrically connected to the driving circuit 200, and the third terminal is grounded.

Further preferably, the energy storage unit can be an inductor, and the output voltage of the driving circuit 200 can be increased by using the self-inductance and the charging and discharging characteristics of the energy storage unit; furthermore, the boost circuit can be provided with a capacitor connected in series with the inductor to make the output voltage smoother.

Further preferably, the rectifying unit may be a diode, and in this case, the first terminal of the rectifying unit is an anode of the diode, and the second terminal is a cathode of the diode.

Further preferably, the switch unit may be a transistor or a MOS (metal oxide semiconductor) transistor, and the switching on or off of the switch unit may control the on or off of the circuit, so as to charge or discharge the inductor.

Fig. 2 shows a schematic circuit diagram of a first part of the detection system, that is, a schematic circuit diagram of the sensing resistor 301, the LED module 100 and the driving circuit 200; fig. 3 shows a schematic diagram of a second part of the detection system, namely a schematic circuit diagram of a circuit 302 in the LED detection apparatus 300.

As shown in fig. 2 and 3, in the circuit, four ports LED1, LED2, LED3 and LED4 of the LED driving chip U1 are electrically connected to first ends of the first LED module 101, the second LED module 102, the third LED module 103 and the fourth LED module 104, respectively; first ends 1-, 2-, 3-and 4-of the four sense resistors R1, R2, R3 and R4 (i.e., the four sense resistors 301) are electrically connected to second ends of the first LED module 101, the second LED module 102, the third LED module 103 and the fourth LED module 104, respectively;

the circuit adopts four current detection units to respectively detect the induced currents of four induction resistors 301: the input ends 1+ and 1-of the first current detection unit U2 are correspondingly and electrically connected with 1+ and 1-of the sensing resistor R1 respectively, and the first current detection unit U2 detects the sensing current of the sensing resistor R1; the input ends 2+ and 2-of the second current detection unit U3 are correspondingly and electrically connected with the 2+ and 2-of the sensing resistor R2 respectively, and the second current detection unit U3 detects the sensing current of the sensing resistor R2; the input ends 3+ and 3-of the third current detection unit U4 are correspondingly and electrically connected with the 3+ and 3-of the sensing resistor R3 respectively, and the induced current of the sensing resistor R3 is detected; the input terminals 4+ and 4-of the fourth current detecting unit U5 are electrically connected to the corresponding terminals 4+ and 4-of the sensing resistor R4, respectively, to detect the induced current of the sensing resistor R4.

In the circuit, a control unit U6 is an MCU, VCC1 is a first power supply, VCC2 is a second power supply, and the circuit further comprises a booster circuit composed of an inductor L1, a diode and an MOS (metal oxide semiconductor) transistor.

The operation of the above-described detection system, and in particular the operation of the LED detection device 300 thereof, will be further described with reference to fig. 1-3:

when the LED driving chip U1 works, the first LED module 101 and the sensing resistor R1 connected to the first LED module 101 both generate an induced current, and the induced current in the first LED module 101 is equal to the induced current of the sensing resistor R1;

the first current detection unit U2 detects the voltage difference between 1+ and 1-at two ends of the resistor R1, and the induced current flowing through the R1 can be obtained according to the voltage difference and the resistance value of R1; further, the first current detection unit U2 converts the obtained induced current into an analog voltage ADC1 through an ADC (analog-to-digital converter) therein, and outputs the analog voltage ADC1 to the MCU;

the MCU detects the analog voltage ADC1, which is equivalent to indirectly reflecting the magnitude of the induced current of the first LED module 100, and can determine the backlight operating state of the first LED module 100 according to the ADC 1. Specifically, the MCU may determine whether the ADC1 meets a preset working condition, and if so, may determine that the backlight working state of the first LED module 100 is normal; if not, the backlight operation status of the first LED module 100 may be determined to be abnormal. The MCU may also determine the current brightness of the first LED module 100 according to the specific value of the ADC1 and feed back the brightness, so as to more accurately know the operating status of the first LED module 100.

When the LED driving chip U1 works, the detection of the second LED module 100, the third LED module 100 and the fourth LED module 100 is similar to that of the first LED module 100, and is not repeated herein.

In summary, the second embodiment of the present invention has at least the following advantages:

1) the LED detection device 300 is applied to a non-ground LED circuit structure comprising the driving circuit 200 and the booster circuit, can simultaneously detect the working states of a plurality of LED modules 100, effectively enlarges the application range and overcomes the limitation of the application range of the prior art;

EXAMPLE III

In a third embodiment of the present invention, corresponding to the first or second embodiment, a method for detecting an LED is provided, which is performed by the LED detecting apparatus 300 provided in the first or second embodiment of the present invention. The flow diagram of the method is shown in fig. 4, and comprises the following steps:

s401, detecting the induced current of at least one induction resistor 301;

s402, determining the backlight working state of the corresponding LED module 100 according to the induced current.

Preferably, the step S401 includes: detecting the induced voltage of the induction resistor 301, and obtaining a corresponding induced current according to the induced voltage; specifically, the induced current can be calculated from the induced voltage and the known resistance of the sense resistor 301.

Preferably, the step S402 includes: the induced current is converted into an analog voltage, and the backlight operating state of the corresponding LED module 100 is determined according to the analog voltage.

Further preferably, determining the backlight operating state of the corresponding LED module 100 according to the analog voltage includes: judging whether the analog voltage meets a preset working condition, and if so, determining that the backlight working state of the LED module 100 is normal; if not, determining that the backlight working state of the LED module 100 is abnormal.

Further preferably, the preset operating condition is a preset voltage threshold or a preset voltage threshold range, and correspondingly, whether the analog voltage meets the preset operating condition is determined, where the following two conditions are present:

Further preferably, the determining whether the analog voltage meets the preset working condition may further include: according to the specific value of the analog voltage, the current brightness or chromaticity of the LED module 100 is determined, and the real-time feedback of the brightness or chromaticity is performed, so that the working state of the LED module 100 and the real-time change condition of the working state can be more accurately known, and then the corresponding setting and adjustment can be performed according to the real-time change condition and the use requirement.

Reference is made to the first embodiment for features not shown in detail in the third embodiment of the present invention.

In summary, the third embodiment of the present invention has at least the following beneficial effects:

Those of skill in the art will appreciate that various operations, methods, steps in the processes, acts, or solutions discussed in the present application may be alternated, modified, combined, or deleted. Further, various operations, methods, steps in the flows, which have been discussed in the present application, may be interchanged, modified, rearranged, decomposed, combined, or eliminated. Further, steps, measures, schemes in the various operations, methods, procedures disclosed in the prior art and the present invention can also be alternated, changed, rearranged, decomposed, combined, or deleted.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. An LED detection system is characterized by comprising a plurality of LED modules, an LED driving chip and an LED detection device;

the LED detection device is used for detecting the backlight working state of at least one LED module and comprises at least one induction resistor and a detection circuit;

the detection circuit is used for detecting the induction current of each induction resistor and determining the backlight working state of the corresponding LED module according to the induction current;

the detection circuit comprises a current detection unit and a control unit;

the current detection unit is used for detecting the induction voltage of the corresponding induction resistor, obtaining the corresponding induction current according to the induction voltage, converting the induction current into an analog voltage and outputting the analog voltage to the control unit, or directly converting the detected induction voltage into the analog voltage and outputting the analog voltage to the control unit;

the control unit is used for determining the backlight working state of the corresponding LED module according to the analog voltage;

the number of the current detection units is at least one, and the input end of each current detection unit is electrically connected with one corresponding induction resistor;

the LED driving chip comprises a plurality of ports;

the first end of each LED module is electrically connected with a corresponding port in the LED driving chip, and the second end of each LED module is electrically connected with a corresponding induction resistor in the detection device;

the LED driving chip is used for driving a plurality of LED modules, and the detection device is used for detecting the backlight working state of at least one LED module.

2. The detection system according to claim 1, wherein each LED module comprises N LEDs connected in series, N being a positive integer;

3. The detection system according to claim 1, wherein when there are more than one LED modules, the LED driving chip is further electrically connected to a voltage boosting circuit, and the voltage boosting circuit is used for boosting the output voltage of the LED driving chip to drive the more than one LED modules to work;

the first end of the energy storage unit is electrically connected with a first power supply outside the detection device, and the second end of the energy storage unit is electrically connected with the first end of the rectification unit; the second end of the rectifying unit is electrically connected with the second end of each induction resistor and the first end of the switch unit; and the second end of the switch unit is electrically connected with the LED driving chip, and the third end of the switch unit is grounded.

4. An LED detection method performed by the LED detection system of claim 1, the method comprising:

detecting an induced current of the at least one induction resistor;

5. The method for detecting according to claim 4, wherein the detecting of the induced current of the at least one sensing resistor comprises: and detecting the induction voltage of the induction resistor, and obtaining corresponding induction current according to the induction voltage.

6. The detecting method according to claim 4, wherein the determining the backlight operation state of the corresponding LED module according to the induced current includes: and converting the induced current into analog voltage, and determining the backlight working state of the corresponding LED module according to the analog voltage.

7. The detecting method according to claim 6, wherein determining the backlight operation state of the corresponding LED module according to the analog voltage comprises: