CN204697348U - Backlight drive circuit and LED-backlit module - Google Patents
Backlight drive circuit and LED-backlit module Download PDFInfo
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- CN204697348U CN204697348U CN201520407282.7U CN201520407282U CN204697348U CN 204697348 U CN204697348 U CN 204697348U CN 201520407282 U CN201520407282 U CN 201520407282U CN 204697348 U CN204697348 U CN 204697348U
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- 238000001514 detection method Methods 0.000 claims abstract description 15
- 239000003381 stabilizer Substances 0.000 claims description 18
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of backlight drive circuit and LED-backlit module, and wherein, backlight drive circuit, for driving LED lamp bar, comprising: ON-OFF control circuit, for connecting the positive pole of DC power supply and LED lamp bar; Detecting feedback circuit, for connecting the negative pole of LED lamp bar, exporting the corresponding signal of telecommunication according to the cathode voltage size of LED lamp bar; Constant-current control circuit, is connected with detection feedback circuit and ON-OFF control circuit, according to the triggering signal detecting feedback circuit output, exports corresponding level signal to ON-OFF control circuit, with the break-make of control switch control circuit.Technical solutions of the utility model effectively achieve the protection to various piece in LED backlight drive circuit, and prevent the generation of security incident, fail safe is better.
Description
Technical field
The utility model relates to backlight drive technical field, particularly a kind of backlight drive circuit and LED-backlit module.
Background technology
At present, the LCD TV of LED backlight is used to occupy the overwhelming majority in market.In the backlight drive circuit of such LCD TV, LED backlight is connected with constant-current driven module, to make each LED lamp bar constant current steady operation in LED backlight.But in the course of the work, easily there is LED lamp bar short trouble due to many factors in LED backlight; LED lamp bar be short-circuited fault time, very manifold operation irregularity in backlight drive circuit can be caused, such as, cause that the temperature of constant-current driven module is too high, device failure, the part of devices of constant-current driven module even may be caused to burst smolder, play the security incidents such as naked light, the fail safe of backlight drive circuit is poor.
Therefore, need badly and propose a kind of new backlight drive scheme, to promote the fail safe of backlight drive circuit.
Utility model content
Main purpose of the present utility model is to provide a kind of backlight drive circuit, is intended to the fail safe promoting backlight drive circuit.
For achieving the above object, the backlight drive circuit that the utility model proposes, for driving LED lamp bar, comprising:
ON-OFF control circuit, for connecting the positive pole of DC power supply and LED lamp bar;
Detecting feedback circuit, for connecting the negative pole of described LED lamp bar, exporting the corresponding signal of telecommunication according to the cathode voltage size of described LED lamp bar;
Constant-current control circuit, is connected with described detection feedback circuit and described ON-OFF control circuit, according to the triggering signal that described detection feedback circuit exports, exports corresponding level signal to described ON-OFF control circuit, to control the break-make of described ON-OFF control circuit.
Preferably, described detection feedback circuit comprises testing circuit and feedback circuit, wherein:
The input of described testing circuit connects the negative pole of described LED lamp bar, and the output of described testing circuit connects the trigger end of described feedback circuit, and the output of described feedback circuit connects described constant-current control circuit;
Described testing circuit according to the cathode voltage size of described LED lamp bar, to export corresponding level signal; The height of the level signal that described feedback circuit exports according to described testing circuit, exports the corresponding signal of telecommunication, exports corresponding level signal to make described constant-current control circuit.
Preferably, described detection feedback circuit also comprises the delay circuit on the trigger end being connected to described feedback circuit, to prevent the potential jump of the trigger end of described feedback circuit.
Preferably, described delay circuit comprises the first electric capacity and the first resistance, and one end of described first electric capacity connects the trigger end of described feedback circuit, other end ground connection, described first resistance and described first Capacitance parallel connection.
Preferably, described testing circuit comprises the detecting unit of a detecting unit or multiple parallel connection, each detecting unit is a corresponding LED lamp bar respectively, and one end of each detecting unit connects the trigger end of described feedback circuit, and the other end of each detecting unit connects the negative pole of corresponding LED lamp bar.
Preferably, described detecting unit comprises voltage-stabiliser tube, and the anode of described voltage-stabiliser tube connects the trigger end of described feedback circuit, and the negative electrode of described voltage-stabiliser tube connects the negative pole of corresponding LED lamp bar.
Preferably, described detecting unit also comprises the counnter attack diode of connecting with described voltage-stabiliser tube, and the conducting direction of described counnter attack diode is towards the trigger end of described feedback circuit.
Preferably, described feedback circuit comprises the second resistance, the 3rd resistance, the 4th resistance, the second electric capacity and switching tube, wherein:
First conduction terminal of described switching tube connects power supply through described second resistance, the second conduction terminal of described switching tube through described 4th grounding through resistance, described second electric capacity and described 4th resistor coupled in parallel; Described 3rd resistance is connected between the first conduction terminal of described switching tube and the second conduction terminal, and the trigger end of described switching tube connects the input of described detection feedback circuit; First conduction terminal of described switching tube or the second conduction terminal are the output of described feedback circuit.
Preferably, described constant-current control circuit is current constant control chip, and the overvoltage protection pin of described current constant control chip connects the output of feedback circuit; Or the under-voltage protection pin of described current constant control chip connects the output of feedback circuit.
The utility model also proposes a kind of LED-backlit module, comprises LED lamp bar and backlight drive circuit as above.
Technical solutions of the utility model detect by arranging the cathode voltage that feedback circuit goes to detect LED lamp bar; detect feedback circuit when LED lamp bar short circuit; exporting the corresponding signal of telecommunication makes constant-current control circuit export corresponding level signal; disconnect with control switch control circuit; thus interrupt the power supply of LED lamp bar; effectively achieve the protection to various piece in LED backlight drive circuit, prevent the generation of security incident, fail safe is better.
Accompanying drawing explanation
Fig. 1 is the circuit module schematic diagram of the utility model backlight drive circuit preferred embodiment;
Fig. 2 is the refinement circuit module schematic diagram detecting feedback circuit in Fig. 1;
Fig. 3 is the circuit diagram that the detection feedback circuit of the utility model backlight drive circuit preferred embodiment is connected with LED lamp bar;
Drawing reference numeral illustrates:
| LED lamp bar 100 | ON-OFF control circuit 200 | Detect feedback circuit 300 |
| Constant-current control circuit 400 | Testing circuit 310 | Feedback circuit 320 |
| Delay circuit 330 | DC power supply VIN | Positive pole LED+ |
| Negative pole LED- | The input A of testing circuit | The output B of testing circuit |
| The trigger end C of feedback circuit | The output D of feedback circuit | Power supply VCC |
| First resistance R1 | Second resistance R2 | 3rd resistance R3 |
| 4th resistance R4 | Divider resistance R5 | First electric capacity C1 |
| Second electric capacity C2 | Switching tube Q1 | Voltage-stabiliser tube ZD1 |
| Counnter attack diode D1 |
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Be described further with regard to the technical solution of the utility model below in conjunction with drawings and the specific embodiments.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model proposes a kind of backlight drive circuit, for driving LED lamp bar 100; The negative pole LED-of LED lamp bar 100 is resistance groundeds.
Referring to figs. 1 through the circuit module schematic diagram that 3, Fig. 1 is the preferred embodiment of the utility model backlight drive circuit; Fig. 2 is the refinement circuit module schematic diagram detecting feedback circuit 300 in Fig. 1; Fig. 3 is the circuit diagram that the detection feedback circuit 300 of the utility model backlight drive circuit preferred embodiment is connected with LED lamp bar 100.
With reference to Fig. 1, in the utility model embodiment, this backlight drive circuit comprises:
ON-OFF control circuit 200, for connecting the positive pole LED+ of DC power supply VIN and LED lamp bar 100; Whether the positive pole LED+ being controlled LED lamp bar 100 by the break-make of ON-OFF control circuit 200 is communicated with DC power supply VIN, namely controls the power on/off of LED lamp bar 100;
Detecting feedback circuit 300, for connecting the negative pole LED-of LED lamp bar 100, exporting the corresponding signal of telecommunication according to the negative pole LED-voltage swing of LED lamp bar 100;
Constant-current control circuit 400, is connected with detection feedback circuit 300 and ON-OFF control circuit 200, according to the triggering signal detecting feedback circuit 300 output, exports corresponding level signal to ON-OFF control circuit 200, with the break-make of control switch control circuit 200.
In the present embodiment example, the operation principle of backlight drive circuit is: detect the voltage that feedback circuit 300 detects the negative pole LED-of LED lamp bar 100, when LED lamp bar 100 normally works, the voltage of the negative pole LED-of LED lamp bar 100 is less, detect feedback circuit 300 and export the corresponding signal of telecommunication (signal of telecommunication that normal condition is corresponding), make constant-current control circuit 400 export the conducting of corresponding level signal (level signal that normal condition is corresponding) control switch control circuit 200, make LED lamp bar 100 keep normal work.When LED lamp bar 100 is short-circuited, the negative pole LED-voltage of LED lamp bar 100 increases, detection feedback circuit 300 detects the voltage after increase, export the corresponding signal of telecommunication (signal of telecommunication that short-circuit condition is corresponding), constant-current control circuit 400 is made to export corresponding level signal (level signal that short-circuit condition is corresponding), this level signal makes ON-OFF control circuit 200 disconnect, thus LED lamp bar 100 and DC power supply VIN disconnect, namely the power supply of LED lamp bar 100 has been interrupted, whole backlight drive circuit power-off, therefore the circuit portions damage preventing LED lamp bar 100 short circuit to cause and the generation of security incident, improve the fail safe of backlight drive circuit.
Backlight drive circuit of the present utility model; the negative pole LED-voltage that feedback circuit 300 goes to detect LED lamp bar 100 is detected by arranging; detect feedback circuit 300 when LED lamp bar 100 short circuit; exporting the corresponding signal of telecommunication makes constant-current control circuit 400 export corresponding level signal; disconnect with control switch control circuit 200, thus interrupt the power supply of LED lamp bar 100, effectively achieve the protection to various piece in LED backlight drive circuit; prevent the generation of security incident, fail safe is better.
Preferably, with reference to Fig. 2, in the present embodiment, detect feedback circuit 300 and comprise testing circuit 310 and feedback circuit 320, wherein: the input A of testing circuit 310 connects the negative pole LED-of LED lamp bar 100, the output B of testing circuit 310 connects the trigger end C of feedback circuit 320, and the output D of feedback circuit 320 connects constant-current control circuit 400; Testing circuit 310 according to the negative pole LED-voltage swing of LED lamp bar 100, to export corresponding level signal; The height of the level signal that feedback circuit 320 exports according to testing circuit 310, exports the corresponding signal of telecommunication, exports corresponding level signal to make constant-current control circuit 400.
Due to may spike be produced in the output voltage of DC power supply VIN, when DC power supply VIN produces spike, the voltage of the positive pole LED+ of LED lamp bar 100 can increase instantaneously, thus the negative pole LED-voltage of LED lamp bar 100 can be caused to increase, now cause level signal during testing circuit 310 output short-circuit state possibly, and then signal of telecommunication when causing feedback circuit 320 output short-circuit state, finally cause constant-current control circuit 400 control switch control circuit 200 to disconnect, namely cause and close backlight drive circuit by mistake.Therefore, in order to prevent the generation of above-mentioned situation, in the present embodiment, detecting feedback circuit 300 and comprising the delay circuit 330 be connected on the trigger end C of feedback circuit 320 further, to prevent the potential jump of the trigger end C of feedback circuit 320.
In the present embodiment, preferred delay circuit 330 comprises the first electric capacity C1 and the first resistance R1, and one end of the first electric capacity C1 connects the trigger end C of feedback circuit 320, and other end ground connection, the first resistance R1 is in parallel with the first electric capacity C1.Suppose below the output B of testing circuit 310 LED lamp bar 100 normally work time what export is low level, what the output B of testing circuit 310 exported when LED lamp bar 100 short circuit is high level, describes in detail the present embodiment principle.After LED lamp bar 100 is short-circuited, the output B of testing circuit 310 exports high level, because the trigger end C of feedback circuit 320 is through the first electric capacity C1 ground connection (namely the output B of testing circuit 310 is through the first electric capacity C1 ground connection), therefore the current potential of the trigger end C of feedback circuit 320 can not sport high level, the high level that testing circuit 310 exports charges to the first electric capacity C1, charging certain hour (i.e. the delay duration of delay circuit 330), electricity on first electric capacity C1 reaches certain value, make the signal of telecommunication during output D output short-circuit state of feedback circuit 320, disconnect to make constant-current control circuit 400 control switch control circuit 200, LED lamp bar 100 power-off.During LED lamp bar 100 power-off, the output B of testing circuit 310 becomes low level, and the first electric capacity C1 is discharged rapidly over the ground by the first resistance R1, when backlight drive circuit is energized again, can not directly disconnect.The spike produced due to DC power supply VIN is moment, duration is very short, therefore, causing the negative pole LED-voltage of LED lamp bar 100 to increase due to spike is also moment, and then the high level that the output B of testing circuit 310 exports also is moment, the first electric capacity C1 also uncharged reach the current potential that the trigger end C of feedback circuit 320 is triggered time, the high level that the output B of testing circuit 310 exports just disappears with regard to spike, can not cause feedback circuit 320 false triggering and finally cause the situation that ON-OFF control circuit 200 turns off by mistake.
Preferably, with reference to Fig. 2 and Fig. 3, in the present embodiment, testing circuit 310 comprises the detecting unit (the present embodiment is for multiple) of a detecting unit or multiple parallel connection, each detecting unit is a corresponding LED lamp bar 100 respectively, one end of each detecting unit connects the trigger end C of feedback circuit 320, and the other end of each detecting unit connects the negative pole LED-of corresponding LED lamp bar 100.Each detecting unit detects the voltage of the negative pole LED-of corresponding LED lamp bar 100 respectively, when any one LED lamp bar 100 short circuit, the voltage of the negative pole LED-of this LED lamp bar 100 increases, level signal during the detecting unit output short-circuit state of this LED lamp bar 100 correspondence, with signal of telecommunication during trigger feedback circuit 320 output short-circuit state, thus constant-current control circuit 400 control switch control circuit 200 is turned off, make the power-off of all LED lamp bar 100.
Preferably, with reference to Fig. 3, the detecting unit in the present embodiment comprises voltage-stabiliser tube ZD1, and the anode of voltage-stabiliser tube ZD1 connects the trigger end C of feedback circuit 320, and the negative electrode of voltage-stabiliser tube ZD1 connects the negative pole LED-of corresponding LED lamp bar 100.In the present embodiment, the operation principle of detecting unit is: when LED lamp bar 100 short circuit, the negative pole LED-voltage of LED lamp bar 100 increases (being greater than the conducting voltage of voltage-stabiliser tube ZD1), make the voltage-stabiliser tube ZD1 conducting of this LED lamp bar 100 correspondence, thus the output B of testing circuit 310 is communicated with the negative pole LED-(high level current potential) of the LED lamp bar 100 of this short circuit, the output B of testing circuit 310 is made to export high level; When LED lamp bar 100 normally works, the voltage of the negative pole LED-of LED lamp bar 100 is less (being less than the conducting voltage of voltage-stabiliser tube ZD1), and each voltage-stabiliser tube ZD1 all not conductings, then the outputs level signals of the output B of testing circuit 310 is low level.
Further, in order to avoid electric current is got back in LED lamp bar 100 through voltage-stabiliser tube ZD1 anti-channeling, the detecting unit of the present embodiment also comprises the counnter attack diode D1 connected with voltage-stabiliser tube ZD1, the conducting direction of counnter attack diode D1, towards the trigger end C of feedback circuit 320, makes detecting unit can only conducting on the output B direction of the negative pole LED-of LED lamp bar 100 to testing circuit 310.
Preferably, composition graphs 1 and Fig. 2, and with reference to Fig. 3, the feedback circuit 320 of the present embodiment comprises the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the second electric capacity C2 and switching tube Q1, wherein: first conduction terminal of switching tube Q1 connects VCC through the second resistance R2, second conduction terminal of switching tube Q1 is through the 4th resistance R4 ground connection, and the second electric capacity C2 is in parallel with the 4th resistance R4; 3rd resistance R3 is connected between first conduction terminal of switching tube Q1 and the second conduction terminal, and the trigger end of switching tube Q1 connects the input A detecting feedback circuit 300; First conduction terminal of switching tube Q1 or the second conduction terminal are the output D of feedback circuit 320.The present embodiment has also been connected in series a divider resistance R5 at the output B of testing circuit 310, and the output B of testing circuit 310 connects the trigger end of the first electric capacity C1 and switching tube Q1 by divider resistance R5.The present embodiment, constant-current control circuit 400 is preferably current constant control chip, and the overvoltage protection pin of current constant control chip connects the output D of feedback circuit 320; Or the under-voltage protection pin of current constant control chip connects the output D of feedback circuit 320.
Below in the present embodiment, preferred switching tube Q1's is NPN type triode, and first conduction terminal of switching tube Q1, the second conduction terminal and trigger end are followed successively by NPN type triode collector electrode, emitter and base stage; The output D of the transmitting of preferred NPN type triode very feedback circuit 320, and the output D that the overvoltage protection pin of preferred current constant control chip connects feedback circuit 320 is example, carefully states the principle of the present embodiment.
The operation principle of the feedback circuit 320 of the present embodiment is: when LED lamp bar 100 normally works, the base stage (i.e. the trigger end of feedback circuit 320) of NPN type triode is low level, NPN type triode is ended, the voltage of the output D of feedback circuit 320 is that the 4th resistance R4 is to the dividing potential drop in the series loop formed by the second resistance R2, the 3rd resistance R3 and the 4th resistance R4, be less than the trigger voltage size of the overvoltage protection end of current constant control chip, the overvoltage protection end of current constant control chip does not trigger, and exports and makes ON-OFF control circuit 200 keep the level signal of conducting; During LED lamp bar 100 short circuit; the base stage of NPN type triode is high level; NPN type triode conducting; the voltage of the output D of feedback circuit 320 is that the 4th resistance R4 is to the dividing potential drop in the series loop formed by the second resistance R2 and the 4th resistance R4; be greater than the trigger voltage size of the overvoltage protection end of current constant control chip; the overvoltage protection end of current constant control chip triggers, and exports the level signal that ON-OFF control circuit 200 is disconnected.
It should be noted that, the present embodiment is only for above-mentioned preferred version, has been described in detail; The scheme of the present embodiment can also be: the output D of NPN type triode current collection very feedback circuit 320, the under-voltage protection end of current constant control chip is connected with the collector electrode of NPN type triode.The switching tube Q1 of the present embodiment can also be the device or switching tube Q1 etc. of other identical function effect, such as scheme: switching tube Q1 is PNP type triode, the emitter of PNP type triode, collector electrode and base stage are followed successively by first conduction terminal of switching tube Q1, second conduction terminal and trigger end, the emitter of PNP type triode is as the output D of feedback circuit 320, the overvoltage protection end of current constant control chip is connected with the emitter of PNP type triode, or, the collector electrode of PNP type triode is as the output D of feedback circuit 320, the under-voltage protection end of current constant control chip is connected with the collector electrode of PNP type triode.
The utility model also proposes a kind of LED-backlit module, this LED-backlit module comprises LED lamp bar 100 and backlight drive circuit, the particular circuit configurations of this backlight drive circuit is with reference to above-described embodiment, because this LED-backlit module have employed whole technical schemes of above-mentioned all embodiments, therefore all beneficial effects that the technical scheme having above-described embodiment is equally brought, this is no longer going to repeat them.Wherein, the positive pole LED+ of LED lamp bar 100 is connected with ON-OFF control circuit 200, negative pole LED-and the connection detecting feedback circuit 300 of LED lamp bar 100.
Should be noted that; the technical scheme of each embodiment of the present utility model can be combined with each other; but must be can be embodied as basis with those skilled in the art; when technical scheme combination occur conflicting maybe cannot realize time people should think that the combination of this technical scheme does not exist, also not the utility model require protection range within.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every equivalent structure transformation utilizing the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a backlight drive circuit, for driving LED lamp bar, is characterized in that, comprising:
ON-OFF control circuit, for connecting the positive pole of DC power supply and LED lamp bar;
Detecting feedback circuit, for connecting the negative pole of described LED lamp bar, exporting the corresponding signal of telecommunication according to the cathode voltage size of described LED lamp bar;
Constant-current control circuit, is connected with described detection feedback circuit and described ON-OFF control circuit, according to the triggering signal that described detection feedback circuit exports, exports corresponding level signal to described ON-OFF control circuit, to control the break-make of described ON-OFF control circuit.
2. backlight drive circuit as claimed in claim 1, it is characterized in that, described detection feedback circuit comprises testing circuit and feedback circuit, wherein:
The input of described testing circuit connects the negative pole of described LED lamp bar, and the output of described testing circuit connects the trigger end of described feedback circuit, and the output of described feedback circuit connects described constant-current control circuit;
Described testing circuit according to the cathode voltage size of described LED lamp bar, to export corresponding level signal; The height of the level signal that described feedback circuit exports according to described testing circuit, exports the corresponding signal of telecommunication, exports corresponding level signal to make described constant-current control circuit.
3. backlight drive circuit as claimed in claim 2, it is characterized in that, described detection feedback circuit also comprises the delay circuit on the trigger end being connected to described feedback circuit, to prevent the potential jump of the trigger end of described feedback circuit.
4. backlight drive circuit as claimed in claim 3, it is characterized in that, described delay circuit comprises the first electric capacity and the first resistance, and one end of described first electric capacity connects the trigger end of described feedback circuit, other end ground connection, described first resistance and described first Capacitance parallel connection.
5. backlight drive circuit as claimed in claim 2, it is characterized in that, described testing circuit comprises the detecting unit of a detecting unit or multiple parallel connection, each detecting unit is a corresponding LED lamp bar respectively, one end of each detecting unit connects the trigger end of described feedback circuit, and the other end of each detecting unit connects the negative pole of corresponding LED lamp bar.
6. backlight drive circuit as claimed in claim 5, it is characterized in that, described detecting unit comprises voltage-stabiliser tube, and the anode of described voltage-stabiliser tube connects the trigger end of described feedback circuit, and the negative electrode of described voltage-stabiliser tube connects the negative pole of corresponding LED lamp bar.
7. backlight drive circuit as claimed in claim 6, it is characterized in that, described detecting unit also comprises the counnter attack diode of connecting with described voltage-stabiliser tube, and the conducting direction of described counnter attack diode is towards the trigger end of described feedback circuit.
8. as the backlight drive circuit in claim 2 to 7 as described in any one, it is characterized in that, described feedback circuit comprises the second resistance, the 3rd resistance, the 4th resistance, the second electric capacity and switching tube, wherein:
First conduction terminal of described switching tube connects power supply through described second resistance, the second conduction terminal of described switching tube through described 4th grounding through resistance, described second electric capacity and described 4th resistor coupled in parallel; Described 3rd resistance is connected between the first conduction terminal of described switching tube and the second conduction terminal, and the trigger end of described switching tube connects the input of described detection feedback circuit; First conduction terminal of described switching tube or the second conduction terminal are the output of described feedback circuit.
9. backlight drive circuit as claimed in claim 8, it is characterized in that, described constant-current control circuit is current constant control chip, and the overvoltage protection pin of described current constant control chip connects the output of feedback circuit; Or the under-voltage protection pin of described current constant control chip connects the output of feedback circuit.
10. a LED-backlit module, comprises LED lamp bar, it is characterized in that, also comprises backlight drive circuit as in one of claimed in any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520407282.7U CN204697348U (en) | 2015-06-12 | 2015-06-12 | Backlight drive circuit and LED-backlit module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520407282.7U CN204697348U (en) | 2015-06-12 | 2015-06-12 | Backlight drive circuit and LED-backlit module |
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| Publication Number | Publication Date |
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| CN204697348U true CN204697348U (en) | 2015-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520407282.7U Expired - Fee Related CN204697348U (en) | 2015-06-12 | 2015-06-12 | Backlight drive circuit and LED-backlit module |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107016967A (en) * | 2017-06-09 | 2017-08-04 | 河源中光电通讯技术有限公司 | Backlight drive circuit |
| CN108538259A (en) * | 2018-05-25 | 2018-09-14 | 京东方科技集团股份有限公司 | Backlight drive circuit, backlight driving method and display device |
| CN113163538A (en) * | 2020-01-22 | 2021-07-23 | 海信视像科技股份有限公司 | Display device |
| CN113823229A (en) * | 2021-09-03 | 2021-12-21 | 惠州视维新技术有限公司 | Driving circuit, fault detection method thereof, backlight module and display device |
| CN114401570A (en) * | 2022-03-25 | 2022-04-26 | 南昌大学 | Visible light communication drive circuit |
-
2015
- 2015-06-12 CN CN201520407282.7U patent/CN204697348U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107016967A (en) * | 2017-06-09 | 2017-08-04 | 河源中光电通讯技术有限公司 | Backlight drive circuit |
| CN107016967B (en) * | 2017-06-09 | 2019-02-26 | 河源华盈科技有限公司 | Backlight drive circuit |
| CN108538259A (en) * | 2018-05-25 | 2018-09-14 | 京东方科技集团股份有限公司 | Backlight drive circuit, backlight driving method and display device |
| CN108538259B (en) * | 2018-05-25 | 2020-05-19 | 京东方科技集团股份有限公司 | Backlight driving circuit, backlight driving method and display device |
| CN113163538A (en) * | 2020-01-22 | 2021-07-23 | 海信视像科技股份有限公司 | Display device |
| CN113823229A (en) * | 2021-09-03 | 2021-12-21 | 惠州视维新技术有限公司 | Driving circuit, fault detection method thereof, backlight module and display device |
| CN114401570A (en) * | 2022-03-25 | 2022-04-26 | 南昌大学 | Visible light communication drive circuit |
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