CN103347352A - LED light source short-circuit detection method and device, LED backlight and liquid crystal display device - Google Patents
LED light source short-circuit detection method and device, LED backlight and liquid crystal display device Download PDFInfo
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- CN103347352A CN103347352A CN2013102912318A CN201310291231A CN103347352A CN 103347352 A CN103347352 A CN 103347352A CN 2013102912318 A CN2013102912318 A CN 2013102912318A CN 201310291231 A CN201310291231 A CN 201310291231A CN 103347352 A CN103347352 A CN 103347352A
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Abstract
The invention discloses an LED light source short-circuit detection method and device, an LED backlight and a liquid crystal display device. The LED light source short-circuit detection method and device aims to simplify the short-circuit detection of an existing LED light source. The LED light source short-circuit detection method is applied to the backlight of the liquid crystal display device, wherein the backlight comprises a plurality of LED lamp strips. The LED light source short-circuit detection method comprises the following steps of inputting M unequal detection voltages to each LED lamp strip; receiving and recording breakover feedback of each LED lamp strip at under each detection voltage; judging whether LED lamps are short-circuited in each LED lamp strip according to the breakover feedback, wherein M is an integer which is not smaller than 1, and the maximum detection voltage is not larger than the normal working voltage of each LED lamp strip. The LED light source short-circuit detection method and device is used for the short-circuit detection of the LED light source, and has the advantages of being easy and convenient to achieve, fast in achievement, sensitive in detection and the like.
Description
Technical field
The present invention relates to the demonstration field, relate in particular to a kind of led light source method for detecting short circuit and device, LED-backlit and liquid crystal display.
Background technology
Led light source as shown in Figure 1 comprises LED lamp bar and PWM controller 12, and described LED lamp bar is provided with several LED11, and in order to realize the short-circuit detecting of each LED in the LED lamp bar, existing method is to have set up diode 13 and short-circuit detecting unit 14; The hardware circuit that wherein said short-circuit detecting unit 14 is made up of various electronic devices and components, complex structure, cost height.
Summary of the invention
(1) goal of the invention
At the problems referred to above, the present invention aims to provide a kind of led light source method for detecting short circuit and device, LED-backlit and liquid crystal display of brand-new, simple in structure, LED lamp short circuit that cost is low.
(2) technical scheme
For reaching above-mentioned purpose, led light source method for detecting short circuit of the present invention, what be applied to liquid crystal indicator comprises that described method comprises in LED multi-path lamp bar backlight:
To M detection voltage that does not wait of each paths of LEDs lamp bar input;
Receive and record the conducting feedback that respectively detects LED lamp bar under the voltage;
Judge in each paths of LEDs lamp bar according to described conducting feedback whether the short circuit of LED lamp is arranged;
Wherein, described M is not less than the normal working voltage that 1 integer and maximum detection voltage are not more than LED lamp bar.
Preferably, m is detected a little default step value between m+1 detection of the voltage ratio voltage;
Wherein, described 1≤m＜M.
Preferably,
Describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Record the initial conducting voltage of every paths of LEDs lamp bar, and calculate the average of all initial conducting voltage;
Functional relation according to the default adjustment factor and the adjustment factor and average is obtained comparative voltage;
Whether judge the corresponding detection voltage of the initial conducting of each conducting LED lamp bar greater than comparative voltage,
This paths of LEDs lamp bar has the short circuit of LED lamp if be not more than then;
If do not have the short circuit of LED lamp greater than this paths of LEDs lamp bar then.
Preferably, describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Whether judge the corresponding detection voltage of the initial conducting of LED lamp bar of each road conducting less than default conducting voltage,
If then in this paths of LEDs lamp bar the short circuit of LED lamp is arranged;
If not, then no LED lamp short circuit in this paths of LEDs lamp bar.
Preferably, the described maximum minimum conducting voltage that voltage is not more than LED lamp bar that detects;
Describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Judge that each paths of LEDs lamp bar detects under voltage whether conducting at each,
If conducting, then this paths of LEDs lamp bar has the short circuit of LED lamp;
If not conducting, then this paths of LEDs lamp bar does not have the short circuit of LED lamp.
For reaching above-mentioned purpose, led light source short-circuit detecting device of the present invention, what be applied to liquid crystal indicator comprises that described device comprises in LED multi-path lamp bar backlight:
Detect voltage output unit, in order to import M detection voltage that does not wait to each paths of LEDs lamp bar;
Conducting feedback receiving record unit is in order to receive and to record the conducting feedback that respectively detects LED lamp bar under the voltage;
Judging unit, in order to judging in each paths of LEDs lamp bar according to described conducting feedback whether the short circuit of LED lamp is arranged,
Wherein, described M is not less than 1 integer and maximum detection voltage is not more than LED lamp bar normal working voltage.
Further, m is detected a little default step value between m+1 detection of the voltage ratio voltage;
Wherein, described 1≤m＜M.
Further, described judging unit comprises:
Computation subunit in order to recording the initial conducting voltage of every paths of LEDs lamp bar, and is calculated the average of all initial conducting voltage;
Comparative voltage is asked for subelement, in order to obtain comparative voltage according to the functional relation of the default adjustment factor and the adjustment factor and average;
Judgment sub-unit, in order to whether judging the corresponding detection voltage of the initial conducting of each conducting LED lamp bar greater than comparative voltage,
This paths of LEDs lamp bar has the short circuit of LED lamp if be not more than then;
If do not have the short circuit of LED lamp greater than this paths of LEDs lamp bar then.
Further, described judging unit, specifically in order to the corresponding detection voltage of the initial conducting of LED lamp bar of judging each road conducting whether less than default conducting voltage,
If then in this paths of LEDs lamp bar the short circuit of LED lamp is arranged;
If not, then no LED lamp short circuit in this paths of LEDs lamp bar.
Further, the described maximum minimum conducting voltage that voltage is not more than LED lamp bar that detects;
Described judging unit, specifically in order to judging that each paths of LEDs lamp bar detects under voltage whether conducting at each,
If conducting, then this paths of LEDs lamp bar has the short circuit of LED lamp;
If not conducting, then this paths of LEDs lamp bar does not have the short circuit of LED lamp.
For reaching above-mentioned purpose, LED-backlit of the present invention comprises led light source, also comprises aforesaid led light source short-circuit detecting device.
For reaching above-mentioned purpose, liquid crystal display of the present invention, comprise backlight, described backlight be the LED-backlit of the above.
(3) beneficial effect of led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display
First: led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display, adopt several detection voltages that do not wait that LED lamp bar is detected, judge whether there is the short circuit of LED lamp according to the conducting feedback, detection method is simply effective, LED lamp by effective detection short circuit, disconnection has the lamp bar of short circuit LED lamp, can play and effectively prevent burning and the problems such as over-voltage breakdown of circuit of driving chip that follow-up lamp bar caused because of the short circuit of LED lamp in when work, thereby provide a kind of brand-new detection method for the short-circuit detecting of LED lamp;
Second: led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display, can not wait the difference that detects between the voltage by arranging as required, the erroneous judgement of avoiding the little deviation of LED conducting to cause is broken, and detects sensitive and accurate;
The the 3rd: led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display, detect voltage by providing to LED lamp bar not wait, judge according to the conducting feedback, detection time is short, usually one of input detect voltage to the time of extracting the conducting feedback less than 2.5ms, all detected and be not more than 30ms usually, thereby it is fast to have detection rates, the advantage that detection efficiency is high;
The the 4th: led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display, carry out the detection of led light source with respect to traditional employing peripheral circuit, only having increased at original led light source adopts firmware to realize the judging unit of judging, have simple in structure, the advantage that equipment cost is low;
The the 5th: led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display, can be used for the detection of the LED lamp short circuit in any moment, especially be fit to be applied to the start detection of led light source, LED-backlit or liquid crystal display, thereby the time-delay of splitting machine testing owing to detection time is short is little, and detection is arranged on start constantly, and the chip that can avoid to greatest extent causing when light source is used in start such as burns at problem.
Description of drawings
Fig. 1 is the syndeton schematic diagram of existing method led light source and checkout gear;
Fig. 2 is the described led light source method for detecting short circuit of first embodiment of the invention flow chart one;
Fig. 3 is the graph of a relation between the detection voltage described in the first embodiment of the invention;
Fig. 4 is the described led light source method for detecting short circuit of first embodiment of the invention flowchart 2;
Fig. 5 is the described led light source method for detecting short circuit of first embodiment of the invention flow chart 3;
Fig. 6 is the described led light source method for detecting short circuit of first embodiment of the invention flow chart four;
Fig. 7 is the structural representation of the described led light source short-circuit detecting device of second embodiment of the invention;
Fig. 8 is the syndeton schematic diagram of the described led light source of second embodiment of the invention and led light source short-circuit detecting device.
Embodiment
Below in conjunction with Figure of description and embodiment led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display are described further.
Led light source generally includes light-emitting diode and power supply or power interface, Light-Emitting Diode carries out luminous after conducting, can form certain conduction voltage drop during conducting, when the LED short circuit in the LED lamp bar that led light source occurs, there are not pressure drop or pressure drop very little on the LED of corresponding short circuit, so when having the short circuit of LED lamp, the required pressure drop integral body of corresponding LED lamp bar reduces, conducting voltage will reduce, and led light source method for detecting short circuit of the present invention and device, LED-backlit and liquid crystal display namely utilize above-mentioned principle to finish the short-circuit detecting of LED.
First embodiment of the present invention provides a kind of led light source method for detecting short circuit, and what be used for liquid crystal indicator includes the backlight, concrete of LED multi-path lamp bar, and as shown in Figure 2, present embodiment led light source method for detecting short circuit comprises:
To M detection voltage that does not wait of each paths of LEDs lamp bar input;
Receive and record the conducting feedback that respectively detects LED lamp bar under the voltage;
Judge in each paths of LEDs lamp bar according to described conducting feedback whether the short circuit of LED lamp is arranged;
Wherein, described M is not less than the normal working voltage that 1 integer and maximum detection voltage are not more than LED lamp bar.Finish the detection of led light source short circuit at this moment, but when being used for liquid crystal indicator backlight, also can carry out following steps usually:
If the LED short circuit is arranged, then disconnect this paths of LEDs lamp bar according to described judgement; By disconnecting this paths of LEDs lamp bar, then when the use of led light source, can be because of not having the short circuit of LED lamp in this LED lamp bar, cause driving chip burn and drive circuit in the problems such as puncture of the limited electronic component of pressure drop such as electric capacity, transistor
If no LED short circuit, the normal connection that then keeps this paths of LEDs lamp bar; Represent that then this paths of LEDs lamp bar is normal, described normally being connected to when normal luminous then this paths of LEDs lamp bar of conducting of conducting that needs then normally disconnects this paths of LEDs lamp bar if need to disconnect.
If the conducting under less than the driving of the normal working voltage of LED lamp bar of LED lamp bar illustrates that then there is the short circuit of LED lamp in this paths of LEDs lamp bar, thereby can realize LED lamp short-circuit detecting according to detecting voltage.
In concrete implementation process, described conducting feedback can be current feedback, voltage feedback or only whether conducting determines whether there is the short circuit of LED lamp in this paths of LEDs lamp bar, detects simple and efficiently, and a kind of detection method that is different from traditional detection is provided.
As the further improvement of present embodiment, m is detected a little default step value between m+1 detection of the voltage ratio voltage as shown in Figure 4;
Wherein, described 1≤m＜M.
Having comprised 7 and detect voltage in Fig. 3, is respectively 21,22,23,24,25,26 and 27, differs a default offset 28 between the adjacent two detection voltages; Shown maximum detects the normal working voltage value that voltage 27 equals LED lamp bar.
Described default step value can arrange according to conducting voltage, the detection precision prescribed of single led lamp, concrete as with as described in default step-length be the turn-on voltage of LED lamp in the LED lamp bar to be detected, so specifically granularity can be as accurate as each LED lamp, namely exist the short circuit of a LED lamp to detect in the paths of LEDs lamp bar.
In concrete implementation process, judge in each paths of LEDs lamp bar whether exist the short circuit of LED lamp to have several different methods, three kinds of method for optimizing are provided below according to the conducting feedback:
First kind: describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Record the initial conducting voltage of every paths of LEDs lamp bar, and calculate the average of all initial conducting voltage;
Functional relation according to the default adjustment factor and the adjustment factor and average is obtained comparative voltage; The described adjustment factor is what set in advance, and the functional relation of the described adjustment factor and average can be that simple arithmetic can be more complicated mapping relations, and can have more in the concrete implementation process needs concrete the setting;
Whether judge the corresponding detection voltage of the initial conducting of each conducting LED lamp bar greater than comparative voltage,
This paths of LEDs lamp bar has the short circuit of LED lamp if be not more than then;
If do not have the short circuit of LED lamp greater than this paths of LEDs lamp bar then.
The described default adjustment factor can be an empirical value that proposes in concrete detection repeatedly, be used for revising the average of all initial conducting voltage, to obtain a conducting voltage of weighing each not short circuit of paths of LEDs lamp bar more accurately, this conducting voltage is the comparative voltage described in the present embodiment.As when as described in be 10V by the average of the initial conducting voltage of the correspondence of LED lamp bar, when the initial conducting voltage of each paths of LEDs lamp bar of correspondence that collection or the analog simulation by empirical value obtains is 11V, so the time the adjustment factor can be set to 1.1, the functional relation of adjusting the factor and average this moment can be to adjust the product of the factor and average; In concrete implementation procedure, concrete if the described adjustment factor is 0.5V, and the functional relation of adjusting between the average of the factor and all initial conducting voltage is both sums, then Ci Shi comparative voltage is 10.5V.
Adopt flow chart that this method carries out the led light source method for detecting short circuit as shown in Figure 4, adopting this kind method to carry out short circuit judges, ask for comparative voltage dynamically, thereby can avoid different LED lamp conducting voltage between the erroneous judgement that causes of deviation, thereby the accuracy height of judging, thereby effectively in robustness and the fail safe of using this led light source further is provided, comparative voltage is dynamically asked in synchronous employing, take into full account the change along with the aging conducting voltage that causes of LED lamp bar, thereby comparative voltage is more near actual conducting voltage more, same raising the accuracy of judging.
Second kind: describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Whether judge the corresponding detection voltage of the initial conducting of LED lamp bar of each road conducting less than default conducting voltage,
If then in this paths of LEDs lamp bar the short circuit of LED lamp is arranged;
If not, then no LED lamp short circuit in this paths of LEDs lamp bar.
Adopt this method, by comparing judgement with default conducting voltage, judge simply, need not computing, simplified implementation procedure again, the same speed that has also improved detection, concrete flow process is shown in Figure 5.
The third: when concrete detection, the described maximum voltage that detects is not more than LED lamp bar
Minimum conducting voltage;
Describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Judge that each paths of LEDs lamp bar detects under voltage whether conducting at each,
If conducting, then this paths of LEDs lamp bar has the short circuit of LED lamp;
If not conducting, then this paths of LEDs lamp bar does not have the short circuit of LED lamp.
The above-mentioned relatively first method of this method and second method, at first will detect voltage and be arranged on normally voltage, by detecting the LED lamp bar that under different detection voltage, has conducting, then in this LED lamp bar the short circuit of LED lamp is arranged, realize simple and fast, adopt the flow chart of this method as shown in Figure 6.
The described method of present embodiment can be applied to the detection of any time, especially be fit to detect with start, namely before using led light source, needs detect, by the described detection method of present embodiment, can effectively avoid driving that the LED lamp because there be fault of LED lamp bar after powering on caused and the breaking-up of circuit.
Comprehensively above-mentioned, the described LED light of present embodiment method for detecting short circuit at first adopts the different voltages that detect to carry out the detection of lamp bar, judges it is a kind of brand-new detection method according to the conducting feedback, and detection is simple, quick and accuracy of detection is controlled.
Second embodiment provided by the invention is the led light source short-circuit detecting device, and particularly, as shown in Figure 7, present embodiment led light source short-circuit detecting device comprises:
Detect voltage output unit, in order to import M detection voltage that does not wait to each paths of LEDs lamp bar; Described detection voltage output unit can be common DC/DC commutator transformer, and in led light source, also be provided with the DC/DC commutator transformer usually, so when the described led light source short-circuit detecting device of present embodiment is connected with the lamp bar of LED, can multiplexing described DC/DC commutator transformer;
Conducting feedback receiving record unit is in order to receive and to record the conducting feedback that respectively detects LED lamp bar under the voltage;
Judging unit is in order to judge in each paths of LEDs lamp bar according to described conducting feedback whether the short circuit of LED lamp is arranged;
Wherein, described M is not less than 1 integer and maximum detection voltage is not more than LED lamp bar normal working voltage.
In concrete implementation process, described conducting feedback receiving record unit and judging unit can integratedly arrange, and include MCU single-chip microcomputer, DSP Digital Circuit Control device or the Programmable Logic Controller of memory.
Described detection voltage output unit, conducting feedback receiving record unit and judging unit just can be used for finishing the detection of LED short circuit, but the back uses does not cause the LED fault in order to prevent from detecting, and also is provided with LED lamp bar connection control unit.
Described LED lamp bar connects control unit, in order to disconnection the LED lamp bar of LED lamp short circuit, the normal connection that keeps the LED lamp bar of no LED lamp short circuit is arranged; Usually in led light source, especially be applied in the led light source backlight, all be connected with the PWM controller, usually the conducting of each the paths of LEDs lamp bar of voltage control by the PWM controller and blocking, so can by whether whether exporting the connection control that control signal realizes LED lamp bar to described PWM controller input signal or described PWM controller, so control by realizing connecting to the PWM controller input signal as single-chip microcomputer concrete enforcement, thereby described PWM controller can be multiplexed with the part that described LED connects control unit;
If the conducting under less than the driving of the normal working voltage of LED lamp bar of LED lamp bar illustrates that then there is the short circuit of LED lamp in this paths of LEDs lamp bar, thereby can realize LED lamp short-circuit detecting according to detecting voltage.
In concrete implementation process, described conducting feedback can be that current feedback, voltage feed back or only whether conducting determines whether there is the short circuit of LED lamp in this paths of LEDs lamp bar, detect simple and efficient, a kind of checkout gear that is different from traditional detection is provided, and with respect to adopting traditional peripheral circuit, the described led light source short-circuit detecting device of present embodiment is judged by the core that adopts burning to have the judging unit of software to detect, simultaneously simple more with respect to the complicated hardware circuit structure, cost is low.
Concrete, described led light source short-circuit detecting device satisfies following relation in order to the Guangxi between the detection voltage that detects when detecting:
A little default step value between m described detection voltage ratio m+1 described detection voltage;
Wherein, described 1≤m＜M.Described step value is to arrange according to the conducting voltage of required accuracy of detection, LED etc., the precision that the introducing by step value can convenient, flexible control detects, thus control is more flexible.
Further, described judging unit comprises:
Computation subunit in order to recording the initial conducting voltage of every paths of LEDs lamp bar, and is calculated the average of all initial conducting voltage;
Comparative voltage is asked for subelement, in order to obtain comparative voltage according to the functional relation of the default adjustment factor and the adjustment factor and average;
Judgment sub-unit, in order to whether judging the corresponding detection voltage of the initial conducting of each conducting LED lamp bar greater than comparative voltage,
If greater than this paths of LEDs lamp bar then the short circuit of LED lamp is arranged;
This paths of LEDs lamp bar does not have the short circuit of LED lamp if be not more than then.
In concrete setting up procedure, described judging unit can encapsulate the technology maturations such as the MCU single-deck utmost point, DSP digital processing unit or PLC Programmable Logic Controller that computation subunit, comparative voltage are to some extent asked for corresponding firmware or the software of subelement, judgment sub-unit, integrated level height, the element that volume is little, thus the described led light source short-circuit detecting device of present embodiment has multiple advantages such as simple in structure, simple for production.
In concrete implementation procedure, described judging unit can also be realized the led light source short-circuit detecting by changing its built-in software or firmware except adopting said structure, can adopt following two kinds of approach particularly at least:
Approach one: described judging unit specifically in order to the corresponding detection voltage of the initial conducting of LED lamp bar of judging each road conducting whether less than default conducting voltage,
If then in this paths of LEDs lamp bar the short circuit of LED lamp is arranged;
If not, then no LED lamp short circuit in this paths of LEDs lamp bar.
Approach two: the described maximum minimum conducting voltage that voltage is not more than LED lamp bar that detects;
Described judging unit, specifically in order to judging that each paths of LEDs lamp bar detects under voltage whether conducting at each,
If conducting, then this paths of LEDs lamp bar has the short circuit of LED lamp;
If not conducting, then this paths of LEDs lamp bar does not have the short circuit of LED lamp.
Led light source generally includes transformer, power supply or components and parts such as power supply interface and switch.Described transformer is generally commutator transformer, has realized the conversion between the height direct current, and power supply can be built-in, also can only be that power supply interface is in order to import power supply from the external world; Described switch adopts PWM controller (impulse controller) and transistorized syndeton to realize usually.The PWM controller is to transistorized grid input high voltage, transistor turns then, the then also conducting of LED lamp bar that is connected with this transistor accordingly, otherwise not conducting.
Further in order to simplify described led light source short-circuit detecting device, the components and parts that can sequentially pulsed LED light source when concrete application carry.Specifically as shown in Figure 8, described led light source comprises LED lamp bar 31, DC/DC unit 32 and PWM controller 34; The described led light source short-circuit detecting device of present embodiment comprises that then detecting voltage output unit, conducting feedback receiving record unit, judging unit and LED lamp bar connects control unit;
Described detection voltage output unit, can adopt DC/DC unit 32, conducting feedback receiving record unit and judging unit is the processing unit 33 that is provided with memory and computation processor, described LED lamp bar connects control unit and is described PWM controller 34.So present embodiment the led light source short-circuit detecting device when being coupled to the led light source of required detection, can the self-contained components and parts of sequentially pulsed LED light source, thereby coupling is strong, compatible good, and the components and parts of setting up with respect to independent led light source are few, thereby simple in structure, cost is low, and checking repeatedly by experiment, accuracy of detection height and detection speed are fast, when being used for the start detection, neither can impacting the available machine time, and improve the fail safe of start back led light source greatly.
The third embodiment of the invention LED-backlit, the present embodiment LED-backlit comprises led light source, also comprises aforesaid led light source short-circuit detecting device.In concrete implementation process, described conducting feedback receiving record unit and judging unit can integratedly arrange, and concrete structure can be MCU single-chip microcomputer, DSP Digital Circuit Control device or the Programmable Logic Controller that includes memory.
The described LED-backlit of present embodiment is owing to comprise led light source short-circuit detecting device of the present invention, thereby have advantages such as device security height and robustness are good, and be provided with the backlight of LED short-circuit detecting circuit with respect to tradition, have low cost and other advantages simple in structure.
The 4th embodiment provided by the invention is liquid crystal display, the described liquid crystal display of present embodiment, comprise backlight and described backlight for as the 3rd embodiment LED-backlit.So this implement described liquid crystal display same have safe, robustness good, simple in structure and low cost and other advantages.
Described liquid crystal display can be display devices such as computer, e-book, flat board and TV.
Above execution mode only is used for explanation the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (12)
1. a led light source method for detecting short circuit is characterized in that, what be applied to liquid crystal indicator comprises that described method comprises in LED multi-path lamp bar backlight:
To M detection voltage that does not wait of each paths of LEDs lamp bar input;
Receive and record the conducting feedback that respectively detects LED lamp bar under the voltage;
Judge in each paths of LEDs lamp bar according to described conducting feedback whether the short circuit of LED lamp is arranged;
Wherein, described M is not less than the normal working voltage that 1 integer and maximum detection voltage are not more than LED lamp bar.
2. led light source method for detecting short circuit according to claim 1 is characterized in that, m is detected m+1 of voltage ratio and detect the little default step value of voltage;
Wherein, described 1≤m＜M.
3. led light source method for detecting short circuit according to claim 2 is characterized in that,
Describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Record the initial conducting voltage of every paths of LEDs lamp bar, and calculate the average of all initial conducting voltage;
Functional relation according to the default adjustment factor and the adjustment factor and average is obtained comparative voltage;
Whether judge the corresponding detection voltage of the initial conducting of each conducting LED lamp bar greater than comparative voltage,
This paths of LEDs lamp bar has the short circuit of LED lamp if be not more than then;
If do not have the short circuit of LED lamp greater than this paths of LEDs lamp bar then.
4. led light source method for detecting short circuit according to claim 2 is characterized in that, describedly judges in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Whether judge the corresponding detection voltage of the initial conducting of LED lamp bar of each road conducting less than default conducting voltage,
If then in this paths of LEDs lamp bar the short circuit of LED lamp is arranged;
If not, then no LED lamp short circuit in this paths of LEDs lamp bar.
5. led light source method for detecting short circuit according to claim 2 is characterized in that,
The described maximum minimum conducting voltage that voltage is not more than LED lamp bar that detects;
Describedly judge in each paths of LEDs lamp bar whether have the short circuit of LED lamp to be specially according to described conducting feedback:
Judge that each paths of LEDs lamp bar detects under voltage whether conducting at each,
If conducting, then this paths of LEDs lamp bar has the short circuit of LED lamp;
If not conducting, then this paths of LEDs lamp bar does not have the short circuit of LED lamp.
6. a led light source short-circuit detecting device is characterized in that, what be applied to liquid crystal indicator comprises that described device comprises in LED multi-path lamp bar backlight:
Detect voltage output unit, in order to import M detection voltage that does not wait to each paths of LEDs lamp bar;
Conducting feedback receiving record unit is in order to receive and to record the conducting feedback that respectively detects LED lamp bar under the voltage;
Judging unit is in order to judge in each paths of LEDs lamp bar according to described conducting feedback whether the short circuit of LED lamp is arranged;
Wherein, described M is not less than 1 integer and maximum detection voltage is not more than LED lamp bar normal working voltage.
7. led light source short-circuit detecting device according to claim 6 is characterized in that, m is detected m+1 of voltage ratio and detect a little default step value between the voltage;
Wherein, described 1≤m＜M.
8. led light source short-circuit detecting device according to claim 7 is characterized in that, described judging unit comprises:
Computation subunit in order to recording the initial conducting voltage of every paths of LEDs lamp bar, and is calculated the average of all initial conducting voltage;
Comparative voltage is asked for subelement, in order to obtain comparative voltage according to the functional relation of the default adjustment factor and the adjustment factor and average;
Judgment sub-unit, in order to whether judging the corresponding detection voltage of the initial conducting of each conducting LED lamp bar greater than comparative voltage,
This paths of LEDs lamp bar has the short circuit of LED lamp if be not more than then;
If do not have the short circuit of LED lamp greater than this paths of LEDs lamp bar then.
9. led light source short-circuit detecting device according to claim 7 is characterized in that, described judging unit, specifically in order to the corresponding detection voltage of the initial conducting of LED lamp bar of judging each road conducting whether less than default conducting voltage,
If then in this paths of LEDs lamp bar the short circuit of LED lamp is arranged;
If not, then no LED lamp short circuit in this paths of LEDs lamp bar.
10. led light source short-circuit detecting device according to claim 7 is characterized in that, the described maximum minimum conducting voltage that voltage is not more than LED lamp bar that detects;
Described judging unit, specifically in order to judging that each paths of LEDs lamp bar detects under voltage whether conducting at each,
If conducting, then this paths of LEDs lamp bar has the short circuit of LED lamp;
If not conducting, then this paths of LEDs lamp bar does not have the short circuit of LED lamp.
11. a LED-backlit comprises led light source, it is characterized in that, also comprises each described led light source short-circuit detecting device as claim 6-10.
12. a liquid crystal display comprises backlightly, it is characterized in that, described backlight be the described LED-backlit of claim 11.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510156394.4A CN104717813B (en) | 2013-07-11 | 2013-07-11 | LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display |
| CN201310291231.8A CN103347352B (en) | 2013-07-11 | 2013-07-11 | LED light source short-circuit detection method and device, LED backlight and liquid crystal display device |
| CN201510156429.4A CN104837291B (en) | 2013-07-11 | 2013-07-11 | LED light source method for detecting short circuit and device, LED backlight and liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310291231.8A CN103347352B (en) | 2013-07-11 | 2013-07-11 | LED light source short-circuit detection method and device, LED backlight and liquid crystal display device |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510156394.4A Division CN104717813B (en) | 2013-07-11 | 2013-07-11 | LED/light source method for detecting short circuit and device, LED backlight and liquid crystal display |
| CN201510156429.4A Division CN104837291B (en) | 2013-07-11 | 2013-07-11 | LED light source method for detecting short circuit and device, LED backlight and liquid crystal display |
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Cited By (4)
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| CN105374222A (en) * | 2015-12-10 | 2016-03-02 | 青岛海信网络科技股份有限公司 | Traffic signal lamp fault threshold value automatic detection method and circuit |
| CN106228934A (en) * | 2016-08-08 | 2016-12-14 | 青岛海信电器股份有限公司 | Liquid crystal indicator and multi partition backlight module LED start short circuit guard method |
| CN109243379A (en) * | 2016-11-29 | 2019-01-18 | 青岛海信电器股份有限公司 | The short-circuit protection method of liquid crystal display device and multi partition LED backlight |
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| CN107589568B (en) * | 2017-09-20 | 2020-05-22 | 武汉精测电子集团股份有限公司 | Automatic learning and detecting device and method for LED lamp string |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103347352B (en) | 2015-04-29 |
| CN104837291A (en) | 2015-08-12 |
| CN104837291B (en) | 2017-12-19 |
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Effective date of registration: 20160622 Address after: 529000 Jiangmen City, Guangdong province advanced manufacturing sand demonstration park, Hisense Avenue, No. B District, No. 8 Patentee after: GUANGDONG HISENSE ELECTRONIC CO., LTD. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: Qingdao Hisense Electric Co., Ltd. |