CN201197218Y - Multi-lamp back light device and its protection circuit - Google Patents

Multi-lamp back light device and its protection circuit Download PDF

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Publication number
CN201197218Y
CN201197218Y CNU2007203117741U CN200720311774U CN201197218Y CN 201197218 Y CN201197218 Y CN 201197218Y CN U2007203117741 U CNU2007203117741 U CN U2007203117741U CN 200720311774 U CN200720311774 U CN 200720311774U CN 201197218 Y CN201197218 Y CN 201197218Y
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CN
China
Prior art keywords
lamp
electric current
judging unit
subcoil
main coil
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNU2007203117741U
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Chinese (zh)
Inventor
谢景昌
赵正辉
王家兴
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Darfon Electronics Suzhou Co Ltd
Darfon Electronics Corp
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Darfon Electronics Suzhou Co Ltd
Darfon Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CNU2007203117741U priority Critical patent/CN201197218Y/en
Application granted granted Critical
Publication of CN201197218Y publication Critical patent/CN201197218Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The utility model provides a multi-light backlight device, which comprises a balanced transformer, a first judgment unit, a second judgment unit and a control unit. The balanced transformer is connected in series with a first light and a second light; a first current flows through the first light and a second current flows through the second light; the fist judgment unit is electrically connected to the first light to judge whether the first current exists; the second judgment unit is electrically connected to the balanced transformer to judge whether a first voltage which is generated by the first current and the second current is a first specific value; and the control unit is electrically connected to the first judgment unit and the second judgment unit. The control unit switches off a power source of the multi-light backlight device.

Description

Many lamp backlight devices and protective circuit thereof
Technical field
The utility model is relevant with many lamp backlight devices, and especially, about a kind of many lamp backlight devices that improve circuit protection function that provide.
Background technology
Because image display technology is constantly progressive, the size of display panels also increases thereupon constantly.In order to provide display panels required high-quality light source, (Cold CathodeFluorescent Lamp, many lamp backlight devices CCFL) are used to the light source as liquid crystal display to comprise a plurality of cold cathode lamps.
In many lamp backlight devices, balancing transformer is used to keep the equal roughly equiv of electric current of each lamp, can have quite stable and brightness uniformly to guarantee the light source that offers display panels.In order to reduce the quantity of the balancing transformer in many lamp backlight devices, there have been the many lamp backlight devices that to control the electric current of two lamps (pushes away two) or four lamps (pushes away four) by a balancing transformer simultaneously at present, to simplify the structure of balancing circuitry, significantly reduce product cost.
No matter be one to push away two or one and push away many lamp backlight devices of four, when wherein arbitrary lamp produces the phenomenon that opens circuit, must have a protective circuit in time to detect opening circuit of lamp and turn-off the power supply of these many lamp backlight devices.For example, one pushes away many lamp backlight devices of two can adopt tapped protective circuit, mainly comprises several resistance or electric capacity, is connected to the contact that backguy comes out to form in the middle of the coil of self-balancing transformer.
Yet; in many lamp backlight devices; if when only adopting tapped protective circuit; issuable greatest problem is; when two lamps corresponding to this balancing transformer all produce the phenomenon that opens circuit; tapped protective circuit can't correctly detect opening circuit of lamp, thereby be difficult to reach the purpose of these many lamp backlight devices of protection.
Therefore, the utility model provides a kind of protective circuit and comprises many lamp backlight devices of this protective circuit, to address the above problem.
The utility model content
The utility model proposes a kind of many lamp backlight devices that the protective circuit of perfect circuit protection function are provided and comprise this protective circuit.
According to a specific embodiment of the present utility model is a kind of many lamp backlight devices.These many lamp backlight devices comprise one first lamp, one second lamp, a balancing transformer, one first judging unit, one second judging unit and a control unit.One first electric current this first lamp of flowing through, one second electric current this second lamp of flowing through.
This balancing transformer serial connection is to this first lamp and this second lamp.Whether this first judging unit is electrically connected to this first lamp, exist in order to judge this first electric current.This second judging unit is electrically connected to this balancing transformer, in order to judge whether one first voltage according to this first electric current and the generation of this second electric current is one first particular value.This control unit is electrically connected to this first judging unit and this second judging unit.If the judged result of this first judging unit or this second judging unit is that this control unit does not turn-off a power supply of these many lamp backlight devices.
According to another specific embodiment of the present utility model is a kind of protective circuit.This protective circuit is used to include the back light system of lamp more than of a balancing transformer, one first lamp and one second lamp.One first electric current this first lamp of flowing through, one second electric current this second lamp of flowing through.
This balancing transformer serial connection is to this first lamp and this second lamp.This protective circuit comprises one first judging unit, one second judging unit and a control unit.Whether this first judging unit is electrically connected to this first lamp, exist in order to judge this first electric current.This second judging unit is electrically connected to this balancing transformer, in order to judge whether one first voltage according to this first electric current and the generation of this second electric current is one first particular value.This control unit is electrically connected to this first judging unit and this second judging unit.If the judged result of this first judging unit or this second judging unit is that this control unit does not turn-off a power supply of these many lamp backlight devices.
Compared to prior art; according to protective circuit of the present utility model and many lamp backlight devices of comprising this protective circuit; quite perfect circuit protection function can be provided; even when all producing the phenomenon that opens circuit corresponding to two lamps of a certain balancing transformer; also can judge rightly the opening circuit and control the power remove of these many lamp backlight devices of lamp, to reach the effect of these many lamp backlight devices of protection.
Can be further understood by following utility model detailed description and accompanying drawing about advantage of the present utility model and spirit.
Description of drawings
Fig. 1 represents the schematic diagram according to many lamp backlight devices of first specific embodiment of the present utility model.
Fig. 2 represents the schematic diagram according to the protective circuit of second specific embodiment of the present utility model.
Fig. 3 represents the schematic diagram according to many lamp backlight devices of the 3rd specific embodiment of the present utility model.
Fig. 4 represents the schematic diagram according to the protective circuit of the 4th specific embodiment of the present utility model.
The main element symbol description
1,2,3,4: many lamp backlight devices 10,22,30,42: the first lamps
12,24,32,44: the second lamps 14,26,34,46: balancing transformer
16,16 ', 27,27 ', 36,46: the first judging units
18,18 ', 28,28 ', 38,48: the second judging units
19,29,39,49: control unit
142,262,342,462: the first main coils
144,264,344,464: the second main coils
146,266,346,466: inferior coil
3422,4622: the first subcoils 3424,4624: the second subcoils
3442,4642: the three subcoils 3444,4644: the four subcoils
R1-R23: resistance U1-U4: optical coupling element
I 1: first electric current I 2: second electric current
Embodiment
According to first specific embodiment of the present utility model is a kind of many lamp backlight devices.Please refer to Fig. 1, Fig. 1 represents the schematic diagram of these many lamp backlight devices.As shown in Figure 1, many lamp backlight devices 1 comprise one first lamp 10, one second lamp 12, a balancing transformer 14, one first judging unit 16, one second judging unit 18 and a control unit 19.One first electric current I 1First lamp, 10, one second electric current I of flowing through 2 Second lamp 12 of flowing through.
Balancing transformer 14 serial connections are to first lamp 10 and second lamp 12.First judging unit 16 is electrically connected to first lamp 10, in order to judge first electric current I 1Whether exist.Second judging unit 18 is electrically connected to balancing transformer 14, in order to judge according to first electric current I 1And second electric current I 2Whether one first voltage that produces is one first particular value.Control unit 19 is electrically connected to first judging unit 16 and second judging unit 18.If the judged result of first judging unit 16 or second judging unit 18 is not, then control unit 19 turn-offs a power supply of many lamp backlight devices 1.
In actual applications, the balancing transformer 14 of many lamp backlight devices 1 comprises one first main coil 142, one second main coil 144 and primary winding 146.First main coil, 142 serial connections are to first lamp 10, and second main coil, 144 serial connections are to first main coil 142 and second lamp 12.Inferior coil 146 is corresponding to first main coil 142 and second main coil 144.
In actual applications, second judging unit 18 can be so-called tapped protective circuit.Second judging unit 18 can comprise at least one resistance and/or electric capacity, this resistance and/or capacitances in series to the first main coil 142 and second main coil 144.When first electric current I 1And second electric current I 2During by this resistance and/or this electric capacity, form this first voltage.As shown in Figure 1, in this embodiment, many lamp backlight devices 1 comprise two second judging units 18,18 '.Wherein second judging unit 18 comprises three resistance R 1, R2 and R3, second judging unit 18 ' then comprise three resistance R 4, R5 and R6.
First judging unit 16 comprises an optical coupling element.If this optical coupling element is according to first electric current I 1One second voltage that is produced is one second particular value, and first judging unit 16 is promptly judged first electric current I 1Exist.As shown in Figure 1, in this embodiment, many lamp backlight devices 1 comprise two first judging units 16,16 '.First judging unit 16 comprises a resistance R 7 and an optical coupling element U1, first judging unit 16 ' then comprise a resistance R 9 and an optical coupling element U2.
In actual applications, the optical coupling element that first judging unit 16 is comprised can be the optical coupling element of an one-way fashion or the optical coupling element of a reversible.
For example, first lamp 10 of supposing many lamp backlight devices 1 opens circuit and second lamp 12 when still keeping conducting, first electric current I of first lamp 10 because flow through this moment 1Do not exist, not should be not so connect the judged result of first judging unit 16 of first lamp 10, as for second judging unit 16 that connects second lamp 12 ' judged result then for being.In addition, because first electric current I 1Do not exist, cause according to first electric current I 1And second electric current I 2First voltage that is produced also produces change, so the judged result of second judging unit 18 also should be not.At this moment, control unit 19 will turn-off the power supply of many lamp backlight devices 1, to reach the effect of the many lamp backlight devices 1 of protection.In like manner, when first lamp 10 was still kept conducting if second lamp 12 of many lamp backlight devices 1 opens circuit, its situation was similar to above-mentioned example, repeats no more.
On the other hand, if when first lamp 10 of many lamp backlight devices 1 and second lamp 12 all open circuit, because first electric current I of first lamp 10 of flowing through at this moment 1Second electric current I with second lamp 12 of flowing through 2All do not exist, thus no matter be first judging unit 16 or first judging unit 16 ' judged result all can be for not.At this moment, control unit 19 will turn-off the power supply of many lamp backlight devices 1, to reach the effect of the many lamp backlight devices 1 of protection.
According to second specific embodiment of the present utility model is a kind of protective circuit.Please refer to Fig. 2, Fig. 2 represents the schematic diagram of this protective circuit.As shown in Figure 2, this protective circuit is used for many lamps back light system 2.Many lamps back light system 2 comprises one first lamp 22, one second lamp 24 and a balancing transformer 26.One first electric current I 1First lamp, 22, one second electric current I of flowing through 2 Second lamp 24 of flowing through.Balancing transformer 26 serial connections are to first lamp 22 and second lamp 24.
This protective circuit comprises one first judging unit 27, one second judging unit 28 and a control unit 29.First judging unit 27 is electrically connected to first lamp 22, in order to judge this first electric current I 1Whether exist.Second judging unit 28 is electrically connected to balancing transformer 26, in order to judge according to first electric current I 1And second electric current I 2Whether one first voltage that produces is one first particular value.Control unit 29 is electrically connected to first judging unit 27 and second judging unit 28.If the judged result of first judging unit 27 or second judging unit 28 is for denying a power supply of control unit 29 many lamps of shutoff back light systems 2.
Balancing transformer 26 comprises one first main coil 262, one second main coil 264 and primary winding 266.First main coil, 262 serial connections are to first lamp 22.Second main coil, 264 serial connections are to first main coil 262 and second lamp 24.266 of inferior coils are corresponding to first main coil 262 and second main coil 264.
In actual applications, second judging unit 28 can be a tapped protective circuit.Second judging unit 28 can comprise at least one resistance and/or an electric capacity.This resistance and/or this capacitances in series to the first main coil 262 and second main coil 264.When first electric current I 1And second electric current I 2During by this resistance and/or this electric capacity, will form this first voltage.As shown in Figure 2, in this embodiment, many lamp backlight devices 2 comprise two second judging units 28,28 '.Wherein second judging unit 28 comprises three resistance R 11, R12 and R13, second judging unit 28 ' then comprise three resistance R 14, R15 and R16.
In fact, first judging unit 27 can comprise an optical coupling element.If this optical coupling element is according to first electric current I 1One second voltage that produces is one second particular value, and first judging unit 27 is promptly judged first electric current I 1Exist.As shown in Figure 2, in this embodiment, many lamp backlight devices 2 comprise two first judging units 27,27 '.Wherein first judging unit 27 comprises a resistance R 17 and an optical coupling element U3, first judging unit 27 ' then comprise a resistance R 19 and an optical coupling element U4.
In actual applications, this optical coupling element can be an one-way fashion optical coupling element or a reversible optical coupling element.
According to the 3rd specific embodiment of the present utility model is a kind of many lamp backlight devices.Please refer to Fig. 3, Fig. 3 represents the schematic diagram of these many lamp backlight devices.As shown in Figure 3, many lamp backlight devices 3 comprise one first lamp 30, one second lamp 32, a balancing transformer 34, one first judging unit 36, one second judging unit 38 and a control unit 39.
Different with above-mentioned two specific embodiments is that in this embodiment, balancing transformer 34 comprises one first main coil 342, one second main coil 344 and primary winding 346.Wherein first main coil 342 further is divided into one first subcoil 3422 and one second subcoil 3424; 344 of second main coils are divided into one the 3rd subcoil 3442 and one the 4th subcoil 3444.First subcoil 3422 and second subcoil, 3424 serial connections are to first lamp 30; The 3rd subcoil 3442 and the 4th subcoil 3444 serial connections are to second lamp 32.As for 346 of inferior coils is corresponding to first main coil 342 and second main coil 344.
First judging unit 36 is serially connected with between first subcoil 3422 and second subcoil 3424.Its main function is to judge one first electric current I of first lamp 30 of flowing through 1Whether exist.Second judging unit 38 is serially connected with between the 3rd subcoil 3442 and the 4th subcoil 3444, and in order to flow through one second electric current I of second lamp 32 of judgement 2Whether exist.Control unit 39 is electrically connected to first judging unit 36 and second judging unit 38.If the judged result of first judging unit 36 for not or the judged result of second judging unit 38 for not, that is to say, if first electric current I 1Do not exist or second electric current I 2Do not exist, control unit 39 will turn-off a power supply of many lamp backlight devices 3.
In actual applications, first judging unit 36 can comprise one first reversible optical coupling element.If this first reversible optical coupling element is according to first electric current I 1One first voltage that is produced is one first particular value, and then first judging unit 36 is judged first electric current I 1Exist.Similarly, second judging unit 38 also can comprise one second reversible optical coupling element.If this second reversible optical coupling element is according to second electric current I 2One second voltage that is produced is one second particular value, and then second judging unit 38 is judged second electric current I 2Exist.
For example, when first lamp 30 of many lamp backlight devices 3 opens circuit, because first judging unit 36 can be judged first electric current I of first lamp 30 of flowing through 1Do not exist, therefore, control unit 39 will turn-off the power supply of many lamp backlight devices 3.In like manner, if when second lamp 32 of many lamp backlight devices 3 produces the phenomenon that opens circuit, because second judging unit 38 can be judged second electric current I of second lamp 32 of flowing through 2Do not exist, therefore, control unit 39 will turn-off the power supply of many lamp backlight devices 3.When suffering from the situation that first lamp 30 and second lamp 32 all open circuit when many lamp backlight devices 3, because the judged result of first judging unit 36 or second judging unit 38 is not, so control unit 39 also can turn-off the power supply of many lamp backlight devices 3.
According to the 4th specific embodiment of the present utility model is a kind of protective circuit.Please refer to Fig. 4, Fig. 4 represents the schematic diagram of this protective circuit.This protective circuit is used for the back light system of lamp more than one 4.Many lamps back light system 4 comprises one first lamp 42, one second lamp 44 and a balancing transformer 46.
Balancing transformer 46 comprises one first main coil 462 and one second main coil 464.Wherein first main coil 462 comprises one first subcoil 4622 and one second subcoil 4624 of serial connection to the first lamp 42; Second main coil 464 comprises one the 3rd subcoil 4642 and one the 4th subcoil 4644 of serial connection to the second lamp 44.In addition, balancing transformer 46 also comprises the primary winding 466 corresponding to first main coil 462 and second main coil 464.
This protective circuit comprises first judging unit 47, second judging unit 48 and control unit 49.First judging unit 47 is electrically connected to first subcoil 4622 and second subcoil 4624, and in order to judge one first electric current I 1Whether exist.First electric current I wherein 1 First lamp 42 of flowing through.Second judging unit 48 is electrically connected to the 3rd subcoil 4642 and the 4th subcoil 4644, and in order to judge one second electric current I 2Whether exist.Second electric current I wherein 2 Second lamp 44 of flowing through.Control unit 49 is electrically connected to first judging unit 47 and second judging unit 48.If the judged result of first judging unit 47 or second judging unit 48 is that control unit 49 will not turn-off a power supply of many lamps back light system 4.
In actual applications, first judging unit 47 can comprise one first reversible optical coupling element.If this first reversible optical coupling element is according to first electric current I 1One first voltage that is produced is one first particular value, and then first judging unit 47 is judged first electric current I 1Exist.Similarly, second judging unit 48 also can comprise one second reversible optical coupling element.If this second reversible optical coupling element is according to second electric current I 2One second voltage that is produced is one second particular value, and then second judging unit 48 is judged second electric current I 2Exist.
Compared to prior art; according to protective circuit of the present utility model and many lamp backlight devices of comprising this protective circuit; quite perfect defencive function can be provided; even when all producing the phenomenon that opens circuit corresponding to two lamps of a certain balancing transformer; also can judge rightly the opening circuit and control the power remove of these many lamp backlight devices of lamp, to reach the effect of these many lamp backlight devices of protection.
By the above detailed description of preferred embodiments, hope can be known description feature of the present utility model and spirit more, and is not to come category of the present utility model is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain various changes and have in the category of the claim that is arranged in the desire application of the utility model institute of equivalence.Therefore, the category of the claim that the utility model is applied for should be done the broadest explanation according to above-mentioned explanation, with the arrangement that causes it to contain all possible change and have equivalence.

Claims (14)

1. lamp backlight device more than a kind is characterized in that, comprises:
One first lamp, one first electric current this first lamp of flowing through;
One second lamp, one second electric current this second lamp of flowing through;
One balancing transformer, serial connection is to this first lamp and this second lamp;
Whether one first judging unit is electrically connected to this first lamp, exist in order to judge this first electric current;
One second judging unit is electrically connected to this balancing transformer, in order to judge whether one first voltage according to this first electric current and the generation of this second electric current is one first particular value; And
One control unit is electrically connected to this first judging unit and this second judging unit, if the judged result of this first judging unit for not or the judged result of this second judging unit for not, this control unit turn-offs a power supply of these many lamp backlight devices.
2. many lamp backlight devices as claimed in claim 1, wherein this balancing transformer comprises:
One first main coil, serial connection is to this first lamp;
One second main coil, serial connection is to this first main coil and this second lamp; And
Primary winding is corresponding to this first main coil and this second main coil.
3. many lamp backlight devices as claimed in claim 2, wherein this second judging unit comprises resistance and/or an electric capacity, this resistance and/or this capacitances in series are to this first main coil and this second main coil, when this first electric current and this second electric current during, form this first voltage by this resistance and/or this electric capacity.
4. many lamp backlight devices as claimed in claim 1, wherein this first judging unit comprises an optical coupling element, if this optical coupling element is one second particular value according to one second voltage that this first electric current produces, this first electric current of this first judgment unit judges exists.
5. many lamp backlight devices as claimed in claim 4, wherein this optical coupling element is an one-way fashion optical coupling element or a reversible optical coupling element.
6. protective circuit; be used to include the back light system of lamp more than of a balancing transformer, one first lamp and one second lamp; this balancing transformer serial connection is to this first lamp and this second lamp; one first electric current this first lamp of flowing through; one second electric current this second lamp of flowing through; it is characterized in that this protective circuit comprises:
Whether one first judging unit is electrically connected to this first lamp, exist in order to judge this first electric current;
One second judging unit is electrically connected to this balancing transformer, in order to judge whether one first voltage according to this first electric current and the generation of this second electric current is one first particular value; And
One control unit is electrically connected to this first judging unit and this second judging unit, if the judged result of this first judging unit for not or the judged result of this second judging unit for not, this control unit turn-offs a power supply of this many lamps back light system.
7. protective circuit as claimed in claim 6, wherein this balancing transformer comprises:
One first main coil, serial connection is to this first lamp;
One second main coil, serial connection is to this first main coil and this second lamp; And
Primary winding is corresponding to this first main coil and this second main coil.
8. protective circuit as claimed in claim 7; wherein this second judging unit comprises resistance and/or an electric capacity; this resistance and/or this capacitances in series are to this first main coil and this second main coil; when this first electric current and this second electric current during, form this first voltage by this resistance and/or this electric capacity.
9. protective circuit as claimed in claim 6, wherein this first judging unit comprises an optical coupling element, if this optical coupling element is one second particular value according to one second voltage that this first electric current produces, this first electric current of this first judgment unit judges exists.
10. protective circuit as claimed in claim 9, wherein this optical coupling element is an one-way fashion optical coupling element or a reversible optical coupling element.
11. lamp backlight device more than a kind is characterized in that, comprises:
One first lamp;
One second lamp;
One balancing transformer comprises:
One first main coil comprises one first subcoil and one second subcoil, and this first subcoil and this second subcoil serial connection are to this first lamp;
One second main coil comprises one the 3rd subcoil and one the 4th subcoil, and the 3rd subcoil and the 4th subcoil serial connection are to this second lamp; And
Primary winding is corresponding to this first main coil and this second main coil;
One first judging unit is serially connected with between this first subcoil and this second subcoil, whether has this first electric current this first lamp of flowing through in order to judge one first electric current;
One second judging unit is serially connected with between the 3rd subcoil and the 4th subcoil, whether has this second electric current this second lamp of flowing through in order to judge one second electric current; And
One control unit is electrically connected to this first judging unit and this second judging unit, if the judged result of this first judging unit or this second judging unit is that this control unit does not turn-off a power supply of these many lamp backlight devices.
12. many lamp backlight devices as claimed in claim 11, wherein this first judging unit comprises one first reversible optical coupling element, if this first reversible optical coupling element is one first particular value according to one first voltage that this first electric current produces, this first electric current of this first judgment unit judges exists, this second judging unit comprises one second reversible optical coupling element, if this second reversible optical coupling element is one second particular value according to one second voltage that this second electric current produces, this second electric current of this second judgment unit judges exists.
13. protective circuit; be used to include the back light system of lamp more than of a balancing transformer, one first lamp and one second lamp; one first main coil of this balancing transformer comprises one first subcoil and one second subcoil of serial connection to this first lamp; one second main coil of this balancing transformer comprises one three subcoil and one four subcoil of serial connection to this second lamp; it is characterized in that this protective circuit comprises:
One first judging unit is electrically connected to this first subcoil and this second subcoil, whether has this first electric current this first lamp of flowing through in order to judge one first electric current;
One second judging unit is electrically connected to the 3rd subcoil and the 4th subcoil, whether has this second electric current this second lamp of flowing through in order to judge one second electric current; And
One control unit is electrically connected to this first judging unit and this second judging unit, if the judged result of this first judging unit or this second judging unit is that this control unit does not turn-off a power supply of this many lamps back light system.
14. protective circuit as claimed in claim 13; wherein this first judging unit comprises one first reversible optical coupling element; if this first reversible optical coupling element is one first particular value according to one first voltage that this first electric current produces; this first electric current of this first judgment unit judges exists; this second judging unit comprises one second reversible optical coupling element; if this second reversible optical coupling element is one second particular value according to one second voltage that this second electric current produces, this second electric current of this second judgment unit judges exists.
CNU2007203117741U 2007-12-24 2007-12-24 Multi-lamp back light device and its protection circuit Expired - Fee Related CN201197218Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNU2007203117741U CN201197218Y (en) 2007-12-24 2007-12-24 Multi-lamp back light device and its protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNU2007203117741U CN201197218Y (en) 2007-12-24 2007-12-24 Multi-lamp back light device and its protection circuit

Publications (1)

Publication Number Publication Date
CN201197218Y true CN201197218Y (en) 2009-02-18

Family

ID=40416846

Family Applications (1)

Application Number Title Priority Date Filing Date
CNU2007203117741U Expired - Fee Related CN201197218Y (en) 2007-12-24 2007-12-24 Multi-lamp back light device and its protection circuit

Country Status (1)

Country Link
CN (1) CN201197218Y (en)

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Granted publication date: 20090218

Termination date: 20111224