CN104717813B - LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display - Google Patents

LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display Download PDF

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Publication number
CN104717813B
CN104717813B CN201510156394.4A CN201510156394A CN104717813B CN 104717813 B CN104717813 B CN 104717813B CN 201510156394 A CN201510156394 A CN 201510156394A CN 104717813 B CN104717813 B CN 104717813B
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led
short circuit
paths
light source
lamp bar
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CN201510156394.4A
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Chinese (zh)
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CN104717813A (en
Inventor
张玉欣
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青岛海信电器股份有限公司
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Priority to CN201510156394.4A priority Critical patent/CN104717813B/en
Priority to CN201310291231.8A priority patent/CN103347352B/en
Publication of CN104717813A publication Critical patent/CN104717813A/en
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Abstract

The invention discloses a kind of LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display, designed to simplify the short-circuit detecting of existing LED/light source.The LED/light source method for detecting short circuit is applied in the backlight including LED multi-path lamp bar of liquid crystal display device, including:The M detection voltages not waited are inputted to each paths of LEDs lamp bar;Receive and record the conducting feedback of LED light bar under each detection voltage;Judge whether there is LED short circuit in each paths of LEDs lamp bar according to the conducting feedback;Wherein, the M is not more than the normal working voltage of LED light bar for the detection voltage of the integer not less than 1 and maximum.The present invention is used for LED/light source short-circuit detecting, simple and efficient with realizing, detects the multiple advantage such as sensitive.

Description

LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display

The application is on 07 11st, 2013 entitled " LED/light source method for detecting short circuit and device, the LED that propose The divisional application of backlight and the Chinese invention patent application of liquid crystal display 201310291231.8.

Technical field

The present invention relates to display field, more particularly to a kind of LED/light source method for detecting short circuit and device, LED backlight and liquid Crystal display device.

Background technology

LED/light source as shown in Figure 1 includes LED light bar and PWM controller 12, and the LED light bar is provided with several LED11, in order to realize the short-circuit detecting of each LED in LED light bar, existing method is to be additionally arranged diode 13 and short circuit inspection Survey unit 14;The hardware circuit that wherein described short detection unit 14 is made up of various electronic components, complicated, cost It is high.

The content of the invention

(One)Goal of the invention

In view of the above-mentioned problems, a kind of the present invention is intended to provide brand-new, simple in construction, cost is low LED short circuit LED Light source method for detecting short circuit and device, LED backlight and liquid crystal display.

(Two)Technical scheme

For up to above-mentioned purpose, LED/light source method for detecting short circuit of the present invention includes multichannel applied to liquid crystal display device In the backlight of LED light bar, methods described includes:

The M detection voltages not waited are inputted to each paths of LEDs lamp bar;

Receive and record the conducting feedback of LED light bar under each detection voltage;

Judge whether there is LED short circuit in each paths of LEDs lamp bar according to the conducting feedback;

Wherein, the M is not more than the normal working voltage of LED light bar for the detection voltage of the integer not less than 1 and maximum.

Preferably, a small default step value between m-th of detection voltage ratio, the m+1 detection voltage;

Wherein, 1≤m < M.

Preferably,

It is described to judge whether to have in each paths of LEDs lamp bar the LED short circuit be specially according to the conducting feedback:

Initial turn-on voltage of the record per paths of LEDs lamp bar, and calculate the average of all initial turn-on voltages;

Functional relation according to default Dynamic gene and Dynamic gene and average obtains comparison voltage;

Judge whether the detection voltage corresponding to each conducting LED light bar initial turn-on is more than comparison voltage,

The paths of LEDs lamp bar has LED short circuit if being not more than;

The paths of LEDs lamp bar is without LED short circuit if being more than.

Preferably, it is described to judge whether to have in each paths of LEDs lamp bar the LED short circuit be specially according to the conducting feedback:

Judge whether be less than default conducting voltage per the detection voltage corresponding to the LED light bar initial turn-on turned on all the way,

If so, then there is LED short circuit in the paths of LEDs lamp bar;

If it is not, then without LED short circuit in the paths of LEDs lamp bar.

Preferably, the maximum detection voltage is not more than the minimum conducting voltage of LED light bar;

It is described to judge whether to have in each paths of LEDs lamp bar the LED short circuit be specially according to the conducting feedback:

Judge whether each paths of LEDs lamp bar turns under each detection voltage,

If conducting, the paths of LEDs lamp bar has LED short circuit;

If being not turned on, the paths of LEDs lamp bar is without LED short circuit.

For up to above-mentioned purpose, LED/light source short-circuit detecting device of the present invention includes multichannel applied to liquid crystal display device In the backlight of LED light bar, described device includes:

Voltage output unit is detected, to input the M detection voltages not waited to each paths of LEDs lamp bar;

Feedback reception recording unit is turned on, the conducting feedback to receive and record LED light bar under each detection voltage;

Judging unit, to judge whether there is LED short circuit in each paths of LEDs lamp bar according to the conducting feedback,

Wherein, the M is not more than LED light bar normal working voltage for the detection voltage of the integer not less than 1 and maximum.

Further, a small default step value between m-th of detection voltage ratio, the m+1 detection voltage;

Wherein, 1≤m < M.

Further, the judging unit includes:

Computation subunit, to record the initial turn-on voltage of every paths of LEDs lamp bar, and calculates all initial turn-on voltages Average;

Comparison voltage asks for subelement, is asked to the functional relation according to default Dynamic gene and Dynamic gene and average Go out comparison voltage;

Judgment sub-unit, to judge it is each conducting LED light bar initial turn-on corresponding to detection voltage whether be more than than Compared with voltage,

The paths of LEDs lamp bar has LED short circuit if being not more than;

The paths of LEDs lamp bar is without LED short circuit if being more than.

Further, the judging unit, specifically to judge per corresponding to the LED light bar initial turn-on turned on all the way Detect whether voltage is less than default conducting voltage,

If so, then there is LED short circuit in the paths of LEDs lamp bar;

If it is not, then without LED short circuit in the paths of LEDs lamp bar.

Further, the maximum detection voltage is not more than the minimum conducting voltage of LED light bar;

The judging unit, specifically to judge whether each paths of LEDs lamp bar turns under each detection voltage,

If conducting, the paths of LEDs lamp bar has LED short circuit;

If being not turned on, the paths of LEDs lamp bar is without LED short circuit.

For up to above-mentioned purpose, LED backlight of the present invention, including LED/light source, in addition to LED/light source as described above short circuit inspection Survey device.

For up to above-mentioned purpose, liquid crystal display of the present invention, including backlight, the backlight is upper described LED backlight.

(Three)The beneficial effect of LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display of the present invention

First:LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display of the present invention, using several The detection voltage not waited is detected to LED light bar, according to conducting feedback and judge with the presence or absence of LED short circuit, detection method letter It is single effective, by the LED of effective detection short circuit, the lamp bar for having short-circuit LED is disconnected, can play effectively prevents follow-up lamp bar Operationally because the driving chip caused by LED short circuit burn and circuit over-voltage breakdown the problems such as, so as to be LED Short-circuit detecting provides a kind of brand-new detection method;

Second:LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display of the present invention, can pass through root The difference for not waiting and detecting between voltage according to needing to set, it is to avoid erroneous judgement caused by the little deviation of LED conductings, detects sensitive standard Really;

3rd:LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display of the present invention, by LED Lamp bar, which is provided, does not wait detection voltage, is judged that detection time is short according to conducting feedback, commonly enters a detection voltage to carrying The time for taking conducting to feed back is less than 2.5ms, has all detected usually more than 30ms, so that, detection effect fast with detection rates The high advantage of rate;

4th:LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display of the present invention, relative to tradition Use peripheral circuit carry out LED/light source detection, only added on original LED/light source using firmware realize judge sentencing Disconnected unit, with simple in construction, the low advantage of equipment cost;

5th:LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display of the present invention, can be used for appointing The detection for the LED short circuit when carved, is particularly suitable for application to the start inspection of LED/light source, LED backlight or liquid crystal display Survey, because detection time is short small so as to the delay of split machine testing, and detection is arranged on the start moment, can kept away to greatest extent Exempt from the problems such as caused chip burns when start is using light source.

Brief description of the drawings

Fig. 1 is the attachment structure schematic diagram of existing method LED/light source and detection means;

Fig. 2 is the LED/light source method for detecting short circuit flow chart one described in first embodiment of the invention;

Fig. 3 is the graph of a relation between the detection voltage described in first embodiment of the invention;

Fig. 4 is the LED/light source method for detecting short circuit flowchart 2 described in first embodiment of the invention;

Fig. 5 is the LED/light source method for detecting short circuit flow chart 3 described in first embodiment of the invention;

Fig. 6 is the LED/light source method for detecting short circuit flow chart four described in first embodiment of the invention;

Fig. 7 is the structural representation of the LED/light source short-circuit detecting device described in second embodiment of the invention;

Fig. 8 is that the attachment structure of the LED/light source and LED/light source short-circuit detecting device described in second embodiment of the invention is shown It is intended to.

Embodiment

With reference to Figure of description and embodiment to LED/light source method for detecting short circuit of the present invention and device, LED backlight and liquid crystal display are described further.

LED/light source generally includes light emitting diode and power supply or power interface, and Light-Emitting Diode enters after switch Row is luminous, and certain conduction voltage drop can be formed during conducting, corresponding when the LED in the LED light bar for LED/light source occur is short-circuit No pressure drop or pressure drop very little on the LED of short circuit, therefore when there is LED short circuit, the required pressure drop of corresponding LED light bar is overall Reduce, conducting voltage will reduce, and LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display of the present invention are profit LED short-circuit detecting is completed with above-mentioned principle.

One embodiment of the present invention provides a kind of LED/light source method for detecting short circuit, the bag for liquid crystal display device In the backlight for including LED multi-path lamp bar, specifically, as shown in Fig. 2 the present embodiment LED/light source method for detecting short circuit includes:

The M detection voltages not waited are inputted to each paths of LEDs lamp bar;

Receive and record the conducting feedback of LED light bar under each detection voltage;

Judge whether there is LED short circuit in each paths of LEDs lamp bar according to the conducting feedback;

Wherein, the M is not more than the normal working voltage of LED light bar for the detection voltage of the integer not less than 1 and maximum. The detection of LED/light source short circuit is had been completed at this moment, but during in the backlight of liquid crystal display device, generally can also be carried out Following steps:

If there are LED short circuits according to the judgement, the paths of LEDs lamp bar is disconnected;By disconnecting the paths of LEDs lamp bar, then in LED Light source in use, will not because of exist in the LED light bar LED short circuit, cause burning and drive circuit for driving chip The problems such as puncturing of the pressure drop limited electronic element such as middle electric capacity, transistor

If without LED short circuits, keeping the normal connection of the paths of LEDs lamp bar;Then represent that the paths of LEDs lamp bar is normal, it is described just Often it is connected as then turning on the paths of LEDs lamp bar when normal luminous needs to turn on, if desired disconnects, normally disconnect the paths of LEDs lamp bar.

If LED light bar is turned under the driving less than the normal working voltage of LED light bar, illustrate the paths of LEDs lamp bar There is LED short circuit, so as to realize LED short-circuit detecting according to detection voltage.

In specific implementation process, the conducting feedback can be current feedback, Voltage Feedback or only be whether conducting To determine in the paths of LEDs lamp bar with the presence or absence of LED short circuit, detect that simple and efficient there is provided a kind of traditional detection that is different from Detection method.

As the further improvement of the present embodiment, m-th of detection voltage ratio the m+1 as shown in Figure 4 detect voltage it Between a small default step value;

Wherein, 1≤m < M.

7 detection voltages are contained in figure 3, are 21,22,23,24,25,26 and 27 respectively, adjacent two detections voltage Between differ a predesigned compensation value 28;Shown maximum detection voltage 27 is equal to the normal operational voltage value of LED light bar.

The default step value can be configured according to conducting voltage, the detection precision prescribed of single led lamp, specifically Step-length is preset as will be described and is the turn-on voltage of LED in LED light bar to be detected, therefore specifically granularity can be as accurate as Each LED lamp, i.e., there is a LED short circuit in LED light bar all the way can detect.

In specific implementation process, judged according to conducting feedback in each paths of LEDs lamp bar with the presence or absence of LED short circuit tool There are a variety of methods, three kinds of method for optimizing are provided below:

The first:It is described to judge whether to have in each paths of LEDs lamp bar the LED short circuit be specially according to the conducting feedback:

Initial turn-on voltage of the record per paths of LEDs lamp bar, and calculate the average of all initial turn-on voltages;

Functional relation according to default Dynamic gene and Dynamic gene and average obtains comparison voltage;The Dynamic gene Pre-set, the functional relation of the Dynamic gene and average can be that simple arithmetic can be more complicated Specific set can be more needed in mapping relations, specific implementation process;

Judge whether the detection voltage corresponding to each conducting LED light bar initial turn-on is more than comparison voltage,

The paths of LEDs lamp bar has LED short circuit if being not more than;

The paths of LEDs lamp bar is without LED short circuit if being more than.

The default Dynamic gene can be the empirical value proposed in being specifically repeatedly detected, for correcting There is the average of initial turn-on voltage, the not short-circuit conducting voltage of each paths of LEDs lamp bar is more accurately weighed to obtain one, this Individual conducting voltage is the comparison voltage described in the present embodiment.Such as when the corresponding initial turn-on voltage by LED light bar Average be 10V, the initial turn-on voltage of each paths of LEDs lamp bar of correspondence obtained by the collection or analog simulation of empirical value is During 11V, so when Dynamic gene could be arranged to 1.1, now the functional relation of Dynamic gene and average can be adjustment because Son and the product of average;During concrete implementation, if the specific Dynamic gene is 0.5V, and Dynamic gene is with owning Functional relation between the average of initial turn-on voltage is both sums, then comparison voltage now is 10.5V.

The flow chart of LED/light source method for detecting short circuit is carried out in this way as shown in figure 4, adopting this method progress Short circuit judges, dynamically asks for comparison voltage, so as to avoid missing caused by the deviation between different LED conducting voltages Sentence, so that the degree of accuracy judged is high, thus it is strong in the further robustness and security provided using the LED/light source, Synchronous asks for comparison voltage using dynamic, takes into full account the change of conducting voltage caused by the aging with LED light bar, so that More comparison voltage, which is more nearly, is actually turned on voltage, the same degree of accuracy for improving judgement.

Second:It is described to judge whether to have in each paths of LEDs lamp bar the LED short circuit be specially according to the conducting feedback:

Judge whether be less than default conducting voltage per the detection voltage corresponding to the LED light bar initial turn-on turned on all the way,

If so, then there is LED short circuit in the paths of LEDs lamp bar;

If it is not, then without LED short circuit in the paths of LEDs lamp bar.

In this way, by being compared judgement with default conducting voltage, judge simple, it is simple again without computing Implementation process is changed, the same speed for also improving detection, shown in specific flow chart 5.

The third:In specific detection, the maximum detection voltage is not more than the minimum conducting voltage of LED light bar;

It is described to judge whether to have in each paths of LEDs lamp bar the LED short circuit be specially according to the conducting feedback:

Judge whether each paths of LEDs lamp bar turns under each detection voltage,

If conducting, the paths of LEDs lamp bar has LED short circuit;

If being not turned on, the paths of LEDs lamp bar is without LED short circuit.

The relatively above-mentioned first method of this method and second method, are arranged on normally electricity by detection voltage first Pressure, the LED light bar that there is conducting under different detection voltage by detecting, then have LED short circuit, realize in the LED light bar Simple and fast, it is as shown in Figure 6 using the flow chart of this method.

Method described in the present embodiment can apply to the detection of any time, is especially suitable for detecting with start, that is, is needing Use and detected before LED/light source, by the detection method described in the present embodiment, can effectively be avoided to electric in LED light bar The driving caused by it there is the LED of failure and the breaking-up of circuit afterwards.

Summary, the LED light method for detecting short circuit described in the present embodiment carries out lamp bar using different detection voltages first Detection, judge it being a kind of brand-new detection method according to conducting feedback, and detection is simple, quick and accuracy of detection can Control.

Second embodiment that the present invention is provided is LED/light source short-circuit detecting device, specifically, as shown in fig. 7, this implementation Example LED/light source short-circuit detecting device includes:

Voltage output unit is detected, to input the M detection voltages not waited to each paths of LEDs lamp bar;The detection electricity It can be common DC/DC commutator transformers to press output unit, and is generally also equipped with DC/DC commutator transformers in LED/light source, Therefore in the LED/light source short-circuit detecting device described in the present embodiment and LED lamp bar connection, the DC/DC direct currents can be multiplexed Transformer;

Feedback reception recording unit is turned on, the conducting feedback to receive and record LED light bar under each detection voltage;

Judging unit, to judge whether there is LED short circuit in each paths of LEDs lamp bar according to the conducting feedback;

Wherein, the M is not more than LED light bar normal working voltage for the detection voltage of the integer not less than 1 and maximum.

In specific implementation process, the conducting feedback reception recording unit and judging unit can with integrally disposed, Include the MCU single-chip microcomputers, DSP Digital Circuit Controls device or programmable controller of memory.

The detection voltage output unit, conducting feedback reception recording unit and judging unit, with regard to that can be used to complete LED The detection of short circuit, but in order to prevent what is used after detection not cause LED failure, it is also provided with LED light bar connection control unit.

The LED light bar connects control unit, the LED light bar for having LED short circuit to disconnect, and keeps without LED short circuit LED light bar normal connection;Generally in LED/light source, it is particularly applied in the LED/light source of backlight, is respectively connected with PWM controls Device processed, generally controls the conducting of each paths of LEDs lamp bar by the voltage of PWM controller and blocks, thus can with by whether to Whether connection of the output control signal to realize LED light bar is controlled for the PWM controller input signal or the PWM controller, Therefore connection control is realized to PWM controller input signal by such as single-chip microcomputer in specific implementation, so as to which the PWM is controlled Device processed is multiplexed with a part for the LED connections control unit;If LED light bar is in the normal working voltage less than LED light bar Turned under driving, then illustrate that the paths of LEDs lamp bar has LED short circuit, so as to realize LED short circuit according to detection voltage Detection.

In specific implementation process, the conducting feedback can be current feedback, Voltage Feedback or only be whether conducting To determine in the paths of LEDs lamp bar with the presence or absence of LED short circuit, detect that simple and efficient there is provided a kind of traditional detection that is different from Detection means, and relative to using traditional peripheral circuit, LED/light source short-circuit detecting device described in the present embodiment by using The core that burning has the judging unit of software to be detected judges that simpler relative to the hardware circuit of complexity is same When, cost is low.

Specifically, the LED/light source short-circuit detecting device is when being detected, between the detection voltage that is detected Guangxi meet following relation:

A small default step value between the detection voltage of voltage ratio m+1 is detected described in m-th;

Wherein, 1≤m < M.The step value is can be entered according to required accuracy of detection, LED conducting voltage etc. Row is set, can be with the precision of convenient, flexible control detection, so as to control more flexible by introducing for step value.

Further, the judging unit includes:

Computation subunit, to record the initial turn-on voltage of every paths of LEDs lamp bar, and calculates all initial turn-on voltages Average;

Comparison voltage asks for subelement, is asked to the functional relation according to default Dynamic gene and Dynamic gene and average Go out comparison voltage;

Judgment sub-unit, to judge it is each conducting LED light bar initial turn-on corresponding to detection voltage whether be more than than Compared with voltage,

The paths of LEDs lamp bar has LED short circuit if being more than;

The paths of LEDs lamp bar is without LED short circuit if being not more than.

In specific setting up procedure, the judging unit can encapsulate computation subunit, comparison voltage and ask for son MCU single-decks pole, DSP digital processing units or the PLC of unit, the corresponding firmware of judgment sub-unit or software Etc. technology maturation, integrated level is high, the element of small volume, so that the LED/light source short-circuit detecting device described in the present embodiment has knot The multiple advantage such as structure is simple, simple for production.

During concrete implementation, the judging unit, can also be by changing in it in addition to using said structure The software or firmware put realize LED/light source short-circuit detecting, specifically can at least use following two kinds of approach:

Approach one:The judging unit is specific to judge per the inspection corresponding to the LED light bar initial turn-on turned on all the way Survey whether voltage is less than default conducting voltage,

If so, then there is LED short circuit in the paths of LEDs lamp bar;

If it is not, then without LED short circuit in the paths of LEDs lamp bar.

Approach two:The maximum detection voltage is not more than the minimum conducting voltage of LED light bar;

The judging unit, specifically to judge whether each paths of LEDs lamp bar turns under each detection voltage,

If conducting, the paths of LEDs lamp bar has LED short circuit;

If being not turned on, the paths of LEDs lamp bar is without LED short circuit.

LED/light source generally includes the components such as transformer, power supply or power supply interface and switch.The transformer leads to Often it is commutator transformer, realizes the conversion between height direct current, power supply can be built-in, can also only be power supply interface To from extraneous input power;The switch generally uses PWM controller(Impulse controller)Come with the attachment structure of transistor Realize.PWM controller is to the grid high input voltage of transistor, then transistor turns, then be connected with the transistor accordingly LED light bar is also switched on, and is otherwise not turned on.

, can be with sequentially pulsed LED light source in specific application further in order to simplify the LED/light source short-circuit detecting device The component carried.Specifically as shown in figure 8, the LED/light source includes LED light bar 31, DC/DC units 32 and PWM controls Device 34;And the LED/light source short-circuit detecting device described in the present embodiment then includes detection voltage output unit, conducting feedback reception note Record unit, judging unit and LED light bar connection control unit;The detection voltage output unit, can be mono- using DC/DC Member 32, conducting feedback reception recording unit and judging unit are the processing unit 33 provided with memory and computation processor, institute It is the PWM controller 34 to state LED light bar connection control unit.Therefore the present embodiment LED/light source short-circuit detecting device work as , can be with the self-contained component of sequentially pulsed LED light source, so that coupling is strong, compatibility needed for being coupled to during the LED/light source of detection It is good and few relative to the component that single LED/light source is set up, so that simple in construction, cost is low, and tested repeatedly by experiment Card, accuracy of detection is high and detection speed is fast, when being detected for starting shooting, will not both impact the split machine time, and greatly Improve the security of LED/light source after start.

Third embodiment of the invention LED backlight, the present embodiment LED backlight, including LED/light source, in addition to it is as described above LED/light source short-circuit detecting device.In specific implementation process, the conducting feedback reception recording unit and judging unit Can be with integrally disposed, specific structure can be included the MCU single-chip microcomputers of memory, DSP Digital Circuit Controls device or can compile Range controller.

LED backlight described in the present embodiment is due to including LED/light source short-circuit detecting device of the present invention, so as to have The advantages of device security height and good robustness, and relative to backlight of the tradition provided with LED short-circuit detecting circuits, with structure Simple low cost and other advantages.

The 4th embodiment that the present invention is provided is liquid crystal display, the liquid crystal display described in the present embodiment, bag Include backlight and the backlight for such as the 3rd embodiment LED backlight.Therefore this implementation described liquid crystal display is same It is good with safe, robustness, simple in construction and low cost and other advantages.

The liquid crystal display can be the display devices such as computer, e-book, flat board and TV.

Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, about the common of technical field Technical staff, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, therefore all Equivalent technical scheme falls within scope of the invention, and scope of patent protection of the invention should be defined by the claims.

Claims (6)

1. a kind of LED/light source method for detecting short circuit, it is characterised in that detected applied to LED multi-path lamp bar in liquid crystal display device, Methods described includes:
The detection voltages that M is not waited not are inputted to each paths of LEDs lamp bar, wherein, the M is the integer not less than 1, and maximum detection Voltage is not more than the minimum conducting voltage of LED light bar;
Receive and record the conducting feedback of LED light bar under each detection voltage;
Judge whether there is LED short circuit in each paths of LEDs lamp bar according to the conducting feedback, be specially:Judge each paths of LEDs lamp Whether bar turns under each detection voltage, if conducting, and the paths of LEDs lamp bar has LED short circuit, if being not turned on, the paths of LEDs lamp Bar is without LED short circuit.
2. LED/light source method for detecting short circuit according to claim 1, it is characterised in that m-th of detection voltage ratio m+1 The individual detection small default step value of voltage;
Wherein, 1≤m < M.
3. a kind of LED/light source short-circuit detecting device, it is characterised in that detected applied to LED multi-path lamp bar in liquid crystal display device, Described device includes:
Voltage output unit is detected, to input the M detection voltages not waited to each paths of LEDs lamp bar, wherein, the M is not Integer less than 1, and maximum detection voltage is not more than the minimum conducting voltage of LED light bar;
Feedback reception recording unit is turned on, the conducting feedback to receive and record LED light bar under each detection voltage;
Judging unit, to judge whether there is LED short circuit in each paths of LEDs lamp bar according to the conducting feedback, be specially:Sentence Whether each paths of LEDs lamp bar of breaking turns under each detection voltage, if conducting, and the paths of LEDs lamp bar has LED short circuit, if not leading Logical, then the paths of LEDs lamp bar is without LED short circuit.
4. LED/light source short-circuit detecting device according to claim 3, it is characterised in that m-th of detection voltage ratio m+1 A small default step value between individual detection voltage;
Wherein, 1≤m < M.
5. a kind of LED backlight component, including LED/light source, it is characterised in that also including as described in claim any one of 3-4 LED/light source short-circuit detecting device.
6. a kind of liquid crystal display, including backlight assembly, it is characterised in that the backlight assembly is described in claim 5 LED backlight component.
CN201510156394.4A 2013-07-11 2013-07-11 LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display CN104717813B (en)

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