CN101009084B - LCD, backlight module and its lamp tube driving device - Google Patents
LCD, backlight module and its lamp tube driving device Download PDFInfo
- Publication number
- CN101009084B CN101009084B CN2006100046636A CN200610004663A CN101009084B CN 101009084 B CN101009084 B CN 101009084B CN 2006100046636 A CN2006100046636 A CN 2006100046636A CN 200610004663 A CN200610004663 A CN 200610004663A CN 101009084 B CN101009084 B CN 101009084B
- Authority
- CN
- China
- Prior art keywords
- fluorescent tube
- transverter
- feedback
- optical detector
- coupled
- Prior art date
- 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
Links
Images
Abstract
This invention discloses one lamp tube drive device for one aphototropism module set, which comprises multiple branch tubes composed of at least one high voltage end; the lamp tube drive device comprises conversion flow device and feedback unit, wherein, the flow conversion device is to output one drive voltage to each tube; feedback unit is coupled to each tube high voltage end and flow conversion device to detect lamp current and to provide one feedback signal to drive voltage accordingly.
Description
Technical field
The invention relates to a kind of LCD, module backlight and lamp tube driver thereof, relate in particular to a kind of fluorescent tube high-pressure side electric current of detecting and do to feed back with the LCD that reaches rated tube current, module backlight and lamp tube driver thereof.
Background technology
Fig. 1 is monolateral driving of the fluorescent tube of existing module backlight (Single Drive) and current feedback circuit block schematic diagram.Please refer to Fig. 1, traditional module backlight 100 be utilize control integrated circuit (Integrated Circuit, IC) 110 output voltage AC, and be converted to driving voltage AC ' via transformer 120, shinny to drive fluorescent tube 130.In addition, module 100 backlight is the feedback circuits 140 that utilize secondary coil 122 1 ends that are coupled to transformer 120, detects the lamp current Id that flow to fluorescent tube 130, and provides feedback voltage Vfb to controlling IC 110 according to this.So control IC 110 just makes comparisons according to the size and the reference voltage level Vref of feedback voltage Vfb, changes voltage AC, and then adjusts driving voltage AC ', so that expection brightness is adjusted in the brightness of fluorescent tube 130.
The high-pressure side HE of monolateral driving fluorescent tube 130 is the secondary coils 122 that couple transformer 120, and the low pressure end LE of fluorescent tube 130 connects ground voltage.In addition, an end of feedback circuit 140 couples secondary coil 122, and its other end is ground connection then, that is is coupled to the low pressure end LE of fluorescent tube 130.In order to make feedback circuit 140 can detect more stable lamp current Id, can couple extra capacitor C simultaneously at the high-pressure side HE place of fluorescent tube 130.Under this feedback circuit connected mode, owing to lamp current Id partly can flow in the capacitor C, that is electric current I c, and remaining partly electric current I d ' is only the electric current of real driving fluorescent tube 130.Therefore, the electric current I d that feedback circuit 140 is detected not is the electric current I d ' of actual driving fluorescent tube 130, reduces the detecting accuracy of feedback circuit 140.
In addition, because the voltage of the high-pressure side HE of fluorescent tube 130 is up to more than several kilovolts, the resistive elements (not being shown among the figure) in the general feedback circuit 140 can't bear so high pressure, so feedback circuit 140 normally is coupled in the low pressure end LE of fluorescent tube 130.So, just can't be applied to the module backlight that uses suspension joint type fluorescent tube (Floating), to carry out the tube current feedback.
Summary of the invention
The present invention is in order to overcome the shortcoming that above-mentioned prior art exists, and a kind of LCD that provides, module backlight and lamp tube driver thereof.The lamp current that utilizes current sense elements such as current transformer or photo-coupler to take out high-pressure side feeds back.Therefore, can improve the accuracy of current feedback, and, improve the application diversity of module backlight applicable to existing suspension joint type fluorescent tube.
According to purpose of the present invention, a kind of lamp tube driver is proposed, be used in a module backlight.Module backlight comprises most tubes, and each tubes comprises at least one high-pressure side.Lamp tube driver comprises transverter (Inverter) and feedback unit.Transverter is in order to export a driving voltage respectively to each fluorescent tube.Feedback unit is coupled to the high-pressure side and the transverter of each fluorescent tube, in order to the detecting lamp current, and provides a feedback signal according to this.Transverter is according to this feedback signal, adjusts driving voltage.
According to purpose of the present invention, a kind of module backlight is proposed, comprise most tubes, transverter and feedback unit.Each fluorescent tube comprises at least one high-pressure side.Transverter is in order to export a driving voltage respectively to each fluorescent tube.Feedback unit is coupled to the high-pressure side and the transverter of each fluorescent tube, in order to the detecting lamp current, and exports a feedback signal according to this.Transverter is adjusted driving voltage according to this feedback signal.
According to purpose of the present invention, a kind of LCD is proposed, comprise liquid crystal panel and module backlight.Module backlight is the below that is positioned at liquid crystal panel.Module backlight comprises most tubes, transverter and feedback unit.Fluorescent tube is in order to providing liquid crystal panel required backlight, and each fluorescent tube comprises at least one high-pressure side.Transverter is in order to export a driving voltage respectively to each fluorescent tube.Feedback unit is high-pressure side and the transverter that is coupled to each fluorescent tube, in order to the detecting lamp current, and exports a feedback signal according to this.Transverter is according to feedback signal, adjusts driving voltage.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent,, the present invention is done detailed explanation below in conjunction with three embodiment and accompanying drawing thereof.Wherein:
Fig. 1 is monolateral driving of the fluorescent tube of prior art module backlight and current feedback circuit block schematic diagram.
Fig. 2 is the modular circuit structural drawing backlight of first embodiment of the invention.
Fig. 3 is the modular circuit structural drawing backlight of second embodiment of the invention.
Fig. 4 is the modular circuit structural drawing backlight of third embodiment of the invention.
Embodiment
Illustrate with three embodiment how module backlight of the present invention detects the lamp current of high-pressure side below, and, adjust the driving voltage of fluorescent tube according to the feedback of current signal.
Please refer to Fig. 2, this figure is the modular circuit structural drawing backlight of first embodiment of the invention.Module 200 backlight for example is to be applied to LCD, in order to provide liquid crystal panel (not being shown among the figure) required backlight.Module 200 backlight comprises transverter (Inverter) 210, n (n is a positive integer) tubes 220 and feedback unit 230.Fig. 2 is to be example with suspension joint type (Floating) fluorescent tube 220.Every tubes 220 has high-pressure side HE1 and HE2.Transverter 210 is in order to difference outputting drive voltage V1～Vn to n tubes 220.Transverter 210 more comprises control IC 212 and n group transformer 214 parallel with one another.Each is organized transformer 214 and has primary winding 214a and secondary coil 214b, and each secondary coil 214b is coupled to the high-pressure side HE1 of fluorescent tube 220 accordingly.Control the primary winding 214a of IC 212 output voltage AC, and produce the driving voltage V1～Vn of induction in secondary coil 214b to each transformer 214, luminous to drive each fluorescent tube 220.
In addition, protected location 236 comprises feedback switch element 237 and protection switch element 239.Feedback switch element 237 is coupled to n current transformer 232, in order to received current signal FB1～FBn, and provides control voltage Vc according to this.Protection switch element 239 comprises N type metal-oxide-semiconductor (MOS) (N-type metaloxide semiconductor, NMOS) field effect transistor Tp.The grid of field effect transistor Tp is coupled to operating voltage Vcc via a resistance, and receives control voltage Vc, the source ground of field effect transistor Tp, and the drain electrode of field effect transistor Tp is coupled to control IC 212.
As mentioned above, when all fluorescent tubes 220 all were in the closed circuit state of normal running, n current transformer 232 was respectively according to lamp current Id1～Idn, current signal FB1～FBn that output current value is non-vanishing.It is the grids that flow to NMOS field effect transistor T1～Tn respectively via diode D1～Dn again that these current signals FB1～FBn flows into feedback switch element 237.Because current signal FB1～FBn is all non-vanishing, the grid voltage of field effect transistor Tn is higher than the earthing potential of source electrode, makes field effect transistor Tn conducting, and causes field effect transistor Tn-1 in regular turn ... T2, T1 conducting make that control voltage Vc is zero.At this moment, the grid voltage Be Controlled voltage Vc of field effect transistor Tp is pulled to zero accurate position, so not conducting of field effect transistor Tp.On the other hand, these current signals FB1～FBn n parallel with one another diode Db1～Dbn that flow through can take out maximum current signal Imax=max{FB1 ... FBn} (Imax ≠ 0) is to provide required feedback voltage Vfb (≠ 0) to controlling IC 212.So control IC 212 just makes comparisons according to feedback voltage Vfb and reference voltage Vref, adjusts the luminosity of fluorescent tube 220.
Moreover, when one of them tubes 220 is open-circuit condition, be example with second tubes 220, this moment, corresponding lamp current Id2 was zero, therefore, the current signal FB2 that is responded to via current transformer 232 also is zero.Feedback current Imax remains the maximal value of these current signals FB1～FBm.Yet the size of feedback voltage Vfb is to depend on the size of feedback current Imax and the output voltage values of protected location 236 simultaneously.Because current signal FB2 is zero, the grid voltage of corresponding field effect transistor T2 also is zero.Even all conductings of field effect transistor T3～Tn this moment make that the source voltage of field effect transistor T2 is zero, still not conducting of field effect transistor T2, and cause whole feedback switch element 237 not conductings.So the grid voltage of the field effect transistor Tp of protection switch element 239 is higher than the source voltage of tool earthing potential according to the input of operating voltage Vcc, so field effect transistor Tp conducting, make that feedback voltage Vfb is zero.At this moment, control IC 212 is zero according to feedback voltage Vfb just, judges that fluorescent tube 220 is in unusual condition, stops outputting drive voltage V1～Vn immediately, suffers further infringement to avoid entire aphototropism mould 200.
Be different from prior art, the module backlight 200 of present embodiment utilizes input end and output terminal that the current transformer 232 of better isolation effect is arranged, and takes out current signal FB1～FBn and feeds back, and can obtain feedback current Imax more accurately.And the feedback unit 230 of module 200 backlight is that the electric current of high-pressure side HE2 of detecting fluorescent tube 220 feed back, more detects applicable to suspension joint type fluorescent tube and bilateral driving (Dual Drive) formula lamp tube current.
Please refer to Fig. 3, this is the modular circuit structural drawing backlight of second embodiment of the invention.Module 300 backlight for example is to be applied to LCD, in order to provide liquid crystal panel (not being shown among the figure) required backlight.Module 300 backlight comprises transverter 310, n (n is a positive integer) tubes 320 and feedback unit 330.Fig. 3 is to be example with suspension joint type fluorescent tube 320.Every tubes 320 has high-pressure side HE1 and HE2.Transverter 310 is in order to difference outputting drive voltage V1～Vn to n tubes 320.Wherein the structure of transverter 310 and with the annexation of fluorescent tube 320, identical with the transverter 210 of first embodiment, just do not give unnecessary details at this.
In the present embodiment, feedback unit 330 comprises n photo-coupler 332, n diode Db1～Dbn and protected location 336.N photo-coupler 332 is coupled to the high-pressure side HE2 and the transverter 310 of n tubes 320 respectively accordingly, in order to receiving corresponding lamp current Id1～Idn, and output current signal FB1～FBn according to this.The anode of n diode Db1～Dbn is respectively in order to received current signal FB1～FBn, and the negative terminal of n diode Db1～Dbn couples mutually and in order to feedback voltage Vfb to be provided.
In addition, identical with the protected location 236 of first embodiment, protected location 336 also comprises feedback switch element 337 and protection switch element 339.Feedback switch element 337 is in order to received current signal FB1～FBn, and control voltage Vc is provided according to this.And protection switch element 339 comprises NMOS field effect transistor Tp.The line construction of protection switch element 339 is identical with the protection switch element 239 of first embodiment, does not just give unnecessary details at this.
As mentioned above, when all fluorescent tubes 320 all were in the closed circuit state of normal running, n photo-coupler 332 was respectively according to lamp current Id1～Idn, current signal FB1～FBn that output current value is non-vanishing.As the feedback switch element 237 of first embodiment, these current signals FB1～FBn is a conducting feedback switch element 337, and makes that control voltage Vc is zero.At this moment, the grid voltage Be Controlled voltage Vc of field effect transistor Tp is pulled to zero accurate position, so not conducting of field effect transistor Tp.On the other hand, these current signals FB1～FBn n parallel with one another diode Db1～Dbn that flow through can take out maximum current signal Imax=max{FB1 ... FBn} (Imax ≠ 0) is to provide required feedback voltage Vfb (≠ 0) to controlling IC312.So control IC 312 just makes comparisons according to feedback voltage Vfb and reference voltage Vref, adjusts the luminosity of fluorescent tube 320.
Moreover, when one of them tubes 320 is open-circuit condition, be example with second tubes 320, this moment, corresponding lamp current Id2 was zero, therefore, the current signal FB2 that is responded to via photo-coupler 332 also is zero.Feedback current Imax remains the maximal value of these current signals FB1～FBm.Yet because current signal FB2 is zero, the grid voltage of corresponding field effect transistor T2 also is zero, thereby causes whole feedback switch element 337 not conductings.At this moment, the grid voltage of field effect transistor Tp is higher than the source voltage of tool earthing potential because of the bias voltage of operating voltage Vcc in the protection switch element 339, so field effect transistor Tp conducting, makes that feedback voltage Vfb is zero.So control IC 312 is zero according to feedback voltage Vfb just, judges that fluorescent tube 320 is in unusual condition, stops to export lamp current Id1～Idn immediately, suffers further infringement to avoid entire aphototropism mould 300.
The module backlight 300 of present embodiment utilizes input end and output terminal that the photo-coupler 332 of better isolation effect is arranged, and takes out current signal FB1～FBn and feeds back, and can obtain feedback current Imax more accurately.And the feedback unit 330 of module 300 backlight is that the electric current of high-pressure side HE2 of detecting fluorescent tube 320 feeds back, more applicable to the current sense of suspension joint type fluorescent tube and bilateral drive-type fluorescent tube (Dual Drive).
Please refer to the 4th figure, this is the modular circuit structural drawing backlight of third embodiment of the invention.Module 400 backlight for example is to be applied to LCD, in order to provide liquid crystal panel (not being shown among the figure) required backlight.Module 400 backlight comprises transverter 410, n (n is a positive integer) tubes 420 and feedback unit 430.The 4th figure is to be example with suspension joint type fluorescent tube 420.Every tubes 420 has high-pressure side HE1 and HE2.The change of current 410 is in order to difference outputting drive voltage V1～Vn to n tubes 420.Wherein the structure of transverter 410 and close with being connected of fluorescent tube 420 and to be is identical with the transverter 210 of first embodiment, does not just give unnecessary details at this.
The feedback unit 330 that is different from second embodiment, feedback unit 430 are n level photo-coupler 432 and the resistance R FB that comprise mutual serial connection.Photo-couplers 432 at different levels comprise light emitting diode (Light EmittedDiode, LED) 434 and optical detector 436.LED 434 is high-pressure side HE2 and the changes of current 410 that are coupled to corresponding fluorescent tube 420, in order to receive corresponding lamp current Id1～Idn.The output terminal of each grade optical detector 436 is the input ends that couple next stage optical detector 436, and the input end of first order optical detector 436 couples operating voltage Vcc, and the output terminal of afterbody optical detector 436 is output feedback current Ifb.The end of resistance R FB is coupled to ground voltage, and its other end (A end) then is coupled to the output terminal of control IC 412 and afterbody optical detector 436.
As mentioned above, when all fluorescent tubes 420 all were in the closed circuit state of normal running, n photo-coupler 432 induced the non-vanishing current signal FB1～FBn of current value respectively according to lamp current Id1～Idn on optical detector 436.Because these optical detectors 436 are mutual serial connections, the feedback current Ifb of afterbody optical detector 436 outputs is the minimum value for these current signals FB1～FBn, that is Ifb=min{FB1 ..., FBn} ≠ 0.The part electric current I r of the feedback current Ifb resistance R FB that flows through makes the A end of resistance R FB can provide feedback voltage Vfb=Ir*RFB (≠ 0) to controlling IC 412.So control IC 412 just makes comparisons according to feedback voltage Vfb and reference voltage Vref, adjusts the luminosity of fluorescent tube 420.
Moreover, when one of them tubes 420 is open-circuit condition, be example with second tubes 420, this moment, corresponding lamp current Id2 was zero, therefore, the current signal FB2 that is responded to via photo-coupler 432 also is zero.Because feedback current Ifb is the minimum value of current signal FB1～FBn, therefore, feedback current Ifb is zero, makes that the A terminal voltage of resistance R FB is zero, and promptly feedback voltage Vfb also is zero.So control IC 412 is zero according to feedback voltage Vfb just, judges that fluorescent tube 420 is in unusual condition, stops outputting drive voltage V1～Vn immediately, suffers further infringement to avoid entire aphototropism mould 400.
Be different from prior art, the module backlight 400 of present embodiment utilizes input end and output terminal that the photo-coupler 432 of better isolation effect is arranged, and takes out current signal FB1～FBn and feeds back with its minimum current value, can obtain feedback current Ifb more accurately.And the feedback unit 430 of module 400 backlight is that the high-pressure side HE2 tube current of detecting fluorescent tube 420 feed back, more detects applicable to suspension joint type fluorescent tube and bilateral drive-type lamp tube current.
According to three above-mentioned embodiment, though the present invention is that example explains with the high-pressure side HE2 that feedback unit 230,330 or 430 couples fluorescent tube 220,320 or 420, right feedback unit 230,330 or 430 can also couple another high-pressure side HE1 of fluorescent tube 220,320 or 420.In addition, feedback unit of the present invention also can have other circuit structure, for example uses other current sense element to detect lamp current, makes feedback to adjust lighting tube brightness, neither disengaging technical scope of the present invention as long as can obtain lamp current.
The disclosed LCD backlight module of above-mentioned three embodiment of the present invention, use the lamp current of current transformer or photo-coupler detecting high-pressure side, to obtain the high-pressure side current signal respectively separately, and feed back according to the maximal value or the minimum value of these current signals, to provide transverter required feedback voltage, and provide ground voltage to stop outputting drive voltage during a fluorescent tube that can be therein open circuit with the control transverter, can provide not only that feedback current and voltage are adjusted lighting tube brightness more accurately, and applicable to monolateral driving, bilateral driving, the current feedback of suspension joint type fluorescent tube etc. improves the application diversity of module backlight.
In sum; though the present invention discloses as above with three embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; all can do the change or the replacement of various equivalences, so protection scope of the present invention is as the criterion with the scope that appending claims was defined.
Claims (9)
1. a lamp tube driver is used in a module backlight, and this module backlight comprises most tubes, and each fluorescent tube comprises at least one high-pressure side; It is characterized in that described lamp tube driver comprises:
One transverter is in order to export a driving voltage respectively to each fluorescent tube; And,
One feedback unit is coupled to each high-pressure side and the described transverter of each fluorescent tube, in order to detecting the lamp current of each fluorescent tube, and provides a feedback signal according to this, and wherein said transverter is adjusted each driving voltage according to this feedback signal; Described feedback unit also comprises:
The multistage photo-coupler of serial connection is coupled to each fluorescent tube and described transverter respectively mutually, and photo-couplers at different levels comprise:
One light emitting diode is coupled to the high-pressure side and the described transverter of this corresponding fluorescent tube, in order to receive corresponding lamp current; And,
One optical detector comprises an input end and an output terminal, and wherein the output terminal of this grade optical detector couples the input end of next stage optical detector; And,
One resistance, wherein one first end of this resistance is coupled to a ground voltage, and one second end of this resistance is coupled to this output terminal of described transverter and afterbody optical detector, in order to feedback signal to be provided.
2. lamp tube driver according to claim 1, it is characterized in that, when fluorescent tube open circuit is at least wherein arranged in each fluorescent tube, corresponding not conducting of optical detector, make that second terminal voltage of described resistance is a ground voltage, and described transverter stops to export each driving voltage according to this ground voltage.
3. lamp tube driver according to claim 1 is characterized in that, when each fluorescent tube is all when closed circuit, the afterbody optical detector is exported a feedback current, make second end of described resistance produce a feedback voltage, and described transverter is adjusted each driving voltage according to this feedback voltage.
4. a module backlight is characterized in that, comprising:
Most tubes, each fluorescent tube comprises at least one high-pressure side;
One transverter is in order to export a driving voltage respectively to each fluorescent tube; And,
One feedback unit is coupled between each high-pressure side and this transverter of each fluorescent tube, in order to detecting the lamp current of each fluorescent tube, and exports a feedback signal according to this; Described feedback unit comprises:
The multistage photo-coupler of serial connection is coupled to each fluorescent tube and this transverter respectively mutually, and photo-couplers at different levels comprise:
One light emitting diode is coupled to the high-pressure side and the described transverter of corresponding fluorescent tube, in order to receive corresponding lamp current; And,
One optical detector comprises an input end and an output terminal, and wherein the output terminal of this grade optical detector couples the input end of next stage optical detector; And,
One resistance, wherein one first end of this resistance is coupled to a ground voltage, and one second end of this resistance is coupled to the output terminal of described transverter and afterbody optical detector, and in order to feedback signal to be provided;
Wherein this transverter is adjusted each driving voltage according to this feedback signal.
5. module backlight according to claim 4 is characterized in that, when having fluorescent tube open circuit in each fluorescent tube at least, corresponding not conducting of optical detector, make that second terminal voltage of this resistance is a ground voltage, described transverter stops to export each driving voltage according to this ground voltage simultaneously.
6. module backlight according to claim 4 is characterized in that, when each fluorescent tube is all when closed circuit, the afterbody optical detector is exported a feedback current, make second end of this resistance produce a feedback voltage, and this transverter is adjusted each driving voltage according to this feedback voltage.
7. module backlight according to claim 4 is characterized in that, each fluorescent tube is the suspension joint type fluorescent tube.
8. module backlight according to claim 4 is characterized in that, each fluorescent tube is bilateral drive-type fluorescent tube.
9. LCD comprises:
One liquid crystal panel; And,
One module backlight is positioned at the below of this liquid crystal panel,
It is characterized in that described module backlight comprises:
Most tubes, in order to provide this liquid crystal panel required backlight, wherein each fluorescent tube comprises at least one high-pressure side;
One transverter is in order to export a driving voltage respectively to each fluorescent tube; And,
One feedback unit is coupled to those high-pressure sides and this transverter of those fluorescent tubes, in order to detecting a lamp current of each fluorescent tube, and exports a feedback signal according to this, and wherein this transverter is adjusted those driving voltages according to this feedback signal; This feedback unit comprises:
The multistage photo-coupler of serial connection is coupled to each fluorescent tube and this transverter respectively mutually, and photo-couplers at different levels comprise:
One light emitting diode is coupled to the high-pressure side and the described transverter of this corresponding fluorescent tube, in order to receive this corresponding lamp current; And,
One optical detector comprises an input end and an output terminal, and wherein this output terminal of this grade optical detector couples this input end of next stage optical detector, and the afterbody optical detector is exported this feedback current; And,
One resistance, wherein one first end of this resistance is coupled to a ground voltage, and one second end of this resistance is coupled to the output terminal of described transverter and afterbody optical detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100046636A CN101009084B (en) | 2006-01-27 | 2006-01-27 | LCD, backlight module and its lamp tube driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100046636A CN101009084B (en) | 2006-01-27 | 2006-01-27 | LCD, backlight module and its lamp tube driving device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101009084A CN101009084A (en) | 2007-08-01 |
| CN101009084B true CN101009084B (en) | 2011-09-14 |
Family
ID=38697485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100046636A Expired - Fee Related CN101009084B (en) | 2006-01-27 | 2006-01-27 | LCD, backlight module and its lamp tube driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101009084B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101730364B (en) * | 2008-10-10 | 2012-07-25 | 华映视讯（吴江）有限公司 | Back light module control system |
| CN103582229B (en) * | 2012-08-10 | 2016-02-03 | 群康科技(深圳)有限公司 | Backlight module and drive circuit and driving method thereof |
| CN105589235B (en) * | 2016-03-11 | 2018-11-20 | 深圳市华星光电技术有限公司 | Driving method for liquid crystal display panel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1515940A (en) * | 2002-11-20 | 2004-07-28 | ���ǵ�����ʽ���� | Lamp driver anjd back light assemlby and liquid crystal display device containing it |
| CN1696793A (en) * | 2004-05-11 | 2005-11-16 | 三星电子株式会社 | Backlight assembly, display device and driving apparatus of light source for display device |
-
2006
- 2006-01-27 CN CN2006100046636A patent/CN101009084B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1515940A (en) * | 2002-11-20 | 2004-07-28 | ���ǵ�����ʽ���� | Lamp driver anjd back light assemlby and liquid crystal display device containing it |
| CN1696793A (en) * | 2004-05-11 | 2005-11-16 | 三星电子株式会社 | Backlight assembly, display device and driving apparatus of light source for display device |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2000-231998A 2000.08.22 * |
| JP特开平8-166575A 1996.06.25 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101009084A (en) | 2007-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8390561B2 (en) | Apparatus for driving lamp and liquid crystal display device having the same | |
| CN102298907B (en) | Load driving circuit, light-emitting device and display device using the same | |
| JP5051501B2 (en) | Providing feedback for lamp current detection and lamp drive voltage adjustment | |
| CN103672538B (en) | Backlight regulating circuit and electronic installation | |
| CN101916548A (en) | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display | |
| TW201128612A (en) | LED backlight circuit for LCD panels | |
| TW201240514A (en) | Driving circuit | |
| TWI458216B (en) | Light emitting diode luminance system having clamping device | |
| CN102548121A (en) | Integrated circuit, control method and light source providing system | |
| KR20160105480A (en) | Flyback booster circuit, LED backlight driving circuit and liquid crystal display | |
| CN101009084B (en) | LCD, backlight module and its lamp tube driving device | |
| CN101277570B (en) | Fluorescent lamp driving method and apparatus | |
| CN103165082B (en) | Double circuit light-emitting diode (LED) drive circuit and display device | |
| CN201369867Y (en) | Multi lamp-tube driving system | |
| CN101287318B (en) | Light source driving device with abnormity detecting function | |
| CN102186293A (en) | Power supply conversion circuit of light emitting diode | |
| TWM425476U (en) | Multi lamp driving system | |
| CN101258782B (en) | Discharge lamp drive control circuit | |
| CN101605422B (en) | Fluorescent lighting tube driving circuit | |
| CN100562911C (en) | LED drive and use its display device | |
| CN100455155C (en) | Cold cathode fluorescent lamp driver | |
| CN101730352A (en) | Backlight source for driving image display device and driving system for driving multi-tube lamp | |
| KR101085216B1 (en) | Multiple AC Input-Single DC Output Converter and Inverter Controller and Inverter System Using Same | |
| JP2007299750A (en) | Discharge lamp driving device | |
| CN101098578B (en) | Lamp tube driving circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20190127 |