CN201403234Y - Interface integrated circuit used for LED backlight system and backlight system thereof - Google Patents
Interface integrated circuit used for LED backlight system and backlight system thereof Download PDFInfo
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- CN201403234Y CN201403234Y CN2009201380394U CN200920138039U CN201403234Y CN 201403234 Y CN201403234 Y CN 201403234Y CN 2009201380394 U CN2009201380394 U CN 2009201380394U CN 200920138039 U CN200920138039 U CN 200920138039U CN 201403234 Y CN201403234 Y CN 201403234Y
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Abstract
The utility model relates to an interface integrated circuit used for an LED backlight system and a corresponding LED backlight system so as to cause the design of a driving circuit of the LED backlight system to be modularized. The LED backlight system comprises a plurality of LED light sources, the interface integrated circuit is electrically connected with the plurality of LED light sources togenerate a plurality of driving currents according to voltage signals and light-dimming signals so as to drive the plurality of LED light sources; and the interface integrated circuit comprises: a first input terminal used for receiving the voltage signals, a second input terminal used for receiving the light-dimming signals, a voltage-to-current converting unit used for generating reference current according to the voltage signals, a current balancing unit used for generating driving current according to the reference current and controlling the current to drive the LED light sources, and a light-dimming control switch used for controlling the operation of the current balancing unit according to the light-dimming signals so as to adjust the brightness of the LED light sources.
Description
Technical field
The utility model relates to a kind of interface integrated circuit and corresponding backlight system of light-emitting diode that is used for backlight system of light-emitting diode.
Background technology
Because liquid crystal panel itself can be not luminous, so LCD must rely on backlight module light source sufficient and that be evenly distributed is provided, with display image normally.Traditionally, (Code Cathode Fluorescent Lamp CCFL) because of having advantages such as high brightness and low cost, and becomes the main lighting source of LCD to cold cathode fluorescent lamp.Yet, enhancing and light-emitting diode (Light Emitting Diode along with environmental consciousness, LED) development of technology, the cold-cathode tube of mercurous composition is little by color saturation height, volume gradually, power saving and the fast light-emitting diode of reaction speed replace, to satisfy the user to the demand of LCD on characteristics such as color, volume, life-span.
Please refer to Fig. 1, Fig. 1 is the configuration diagram of known cold cathode fluorescent lamp back light system 10.As shown in Figure 1, after back light system 10 is converted to High Level AC Voltage by an electric pressure converter 11 with direct voltage, see through a high-voltage signal line H1 and low-voltage signal line L1 transmission AC power to a cold cathode fluorescent lamp 12, so that cold cathode fluorescent lamp 12 produces the required light source of a backlight module 13.Because cold cathode fluorescent lamp 12 only need use two signal line to drive, so does not need the complex interface circuit design between backlight module and the drive circuit.
Please refer to Fig. 2, Fig. 2 is the configuration diagram of known backlight system of light-emitting diode 20.Because the brightness of light-emitting diode is determined by its size of current, therefore back light system 20 need be by the current balance circuit 22 in the one drive circuit 21, generation and control flows are through the size of current of each LED source, to avoid producing the phenomenon of Luminance Distribution inequality.In this case, except a voltage signal line S1 who is used to provide light-emitting diode operating voltage Vin, need to see through holding wire CH1～CHn between backlight module 23 and the drive circuit 21 in addition and be connected, to provide each LED source required operating current, as shown in Figure 2.
Yet, increase along with panel size, it is more and more that the employed LED source quantity of back light system also becomes, in this case, no matter be that redesign has the chip for driving of enough current output terminal mouths, perhaps increase the quantity that chip for driving is used, all can cause the increase of manufacturer's cost.Hence one can see that, and the foregoing circuit framework is unfavorable for the development of backlight system of light-emitting diode, thereby need modular interface integrated circuit, to reduce the production cost of backlight system of light-emitting diode.
Summary of the invention
The purpose of this utility model is to provide a kind of interface integrated circuit and corresponding backlight system of light-emitting diode that is used for backlight system of light-emitting diode, so that backlight system of light-emitting diode is realized the modularization of design of drive circuit.
For realizing above-mentioned purpose, the utility model provides a kind of interface integrated circuit that is used for backlight system of light-emitting diode, it is characterized in that: described backlight system of light-emitting diode comprises a plurality of LED source, and described interface integrated circuit comprises that first input end, second input, voltage are to current conversion unit, current balancing unit and dimming control switch; The described first input end and second input are respectively in order to receive voltage signal and dim signal; Described voltage to current conversion unit is electrically connected at described first input end, with according to voltage signal, produces a reference current; Described current balancing unit is electrically connected at described voltage to current conversion unit, with according to described reference current, produces a plurality of drive currents, and controls the size of current of described a plurality of drive currents, to drive described a plurality of LED source; Described dimming control switch is electrically connected at described second input and current balancing unit, with according to dim signal, controls the running of described current balancing unit, to adjust the brightness of described a plurality of LED source.
The utility model has also disclosed a kind of backlight system of light-emitting diode, comprises a plurality of LED source and an interface integrated circuit.Described interface integrated circuit is electrically connected at described a plurality of LED source, with according to a voltage signal and a dim signal, produces a plurality of drive currents, to drive described a plurality of LED source.
Description of drawings
Fig. 1 is the configuration diagram of known cold cathode fluorescent lamp back light system.
Fig. 2 is the configuration diagram of known backlight system of light-emitting diode.
Fig. 3 is the embodiment schematic diagram that is used for the interface integrated circuit of backlight system of light-emitting diode of the present utility model.
Fig. 4 is the embodiment schematic diagram of backlight system of light-emitting diode of the present utility model.
Embodiment
Please refer to Fig. 3, Fig. 3 is the embodiment schematic diagram that is used for the interface integrated circuit 30 of backlight system of light-emitting diode of the present utility model.Interface integrated circuit 30 comprises that first input end 31, second input 32, voltage are to current conversion unit 33, current balancing unit 34 and dimming control switch 35, it is used for the dim signal PWM1 that the voltage signal Vin that received according to first input end 31 and second input 32 are received, driven for emitting lights diode light-source LED_1～LED_n.Preferably, voltage signal Vin and dim signal PWM1 are respectively a direct current voltage signal and a pulse wave width modulation signal, produce (not being shown among the figure) by an external voltage transducer and a pulse wave width modulation (PWM, Pulse Width Modulation) controller respectively.Voltage to current conversion unit 33 is electrically connected at first input end 31, with according to voltage signal Vin, produces a reference current Iref.Current balancing unit 34 is electrically connected at voltage to current conversion unit 33, with according to reference current Iref, produces the also size of current of controlling and driving electric current I 1～In, with driven for emitting lights diode light-source LED_1～LED_n.Dimming control switch 35 is electrically connected at second input 32 and current balancing unit 34, and with according to dim signal PWM1, the running of Control current balancing unit 34 is to adjust the brightness of LED source LED_1～LED_n.In this programme, " electric connection " comprises any direct or indirect means that are electrically connected.
In preferred embodiment of the present utility model, current balancing unit is a current mirroring circuit, and it is that (Bipolar Junction Transistor, BJT) Q0～Qn forms by the two-carrier junction transistor with identical electrical characteristic.The collector electrode of transistor Q0 and base stage are electrically connected at voltage simultaneously to current conversion unit 33, and emitter then is electrically connected at and systematically holds GND.The collector electrode of transistor Q1～Qn is electrically connected at LED source LED_1～LED_n respectively, and emitter is electrically connected at by dimming control switch 35 and systematically holds GND, and base stage then is electrically connected at collector electrode and the base stage of transistor Q0.Detail operations about current balance circuit 34 is well-known to those skilled in the art, does not add to give unnecessary details in this.
Therefore, interface integrated circuit 30 of the present utility model is by current balance circuit 34, and according to the reference current Iref of voltage signal generation that Vin changes, the current balance type of controlling and driving electric current I 1～In is with driven for emitting lights diode light-source LED_1～LED_n.In addition, interface integrated circuit 30 can see through dimming control switch 35 Control current balancing units 34 and the electric connection of systematically holding GND, so that LED source LED_1～LED_n is carried out light modulation according to the pulse bandwidth of dim signal PWM1 in addition.
Thus, under circuit framework of the present utility model, no matter the number of LED source quantity, the drive circuit of backlight system of light-emitting diode all only need utilize two signal line to be connected with backlight module, and can make the module design of drive circuit and reduce production costs.
Please refer to Fig. 4, Fig. 4 is the embodiment schematic diagram of backlight system of light-emitting diode 40 of the present utility model.As shown in Figure 4, backlight system of light-emitting diode 40 mainly comprises an interface integrated circuit 41, a backlight module 42 and one drive circuit 43.Interface integrated circuit 41 is that the interface integrated circuit 30 in Fig. 3 is realized, with according to a voltage signal Vin and a dim signal PWM1, produces and the size of current of controlling and driving electric current I 1～In, to drive the LED source in the backlight module 42.In this case, because drive circuit 43 only needs to transmit voltage signal Vin and the dim signal PWM1 that is produced by holding wire S2 and S3, even therefore the quantity of LED source increases and increases along with panel size, this programme only needs the quantity according to LED source, docking port integrated circuit 41 is done suitably and is adjusted, for example increase transistorized quantity, and need not redesign chip for driving, perhaps increase the usage quantity of chip for driving with enough current output terminal mouths.
Above-mentioned interface integrated circuit only is of the present utility model one explanation for example, those skilled in the art are when making suitable modification according to the actual requirements, for example, interface integrated circuit 30 in addition can be in voltage to current conversion unit 33 and current balancing unit 34 between a variable resistor VR is set, to adjust the size of reference current Iref, corresponding variation like this all belongs to scope of the present utility model.
In sum, the utility model interface integrated circuit can produce the required steady operation electric current of backlight module according to input voltage and dim signal, to drive the LED source in the backlight module.Therefore, no matter the number of LED source quantity, the drive circuit of backlight system of light-emitting diode all only need utilize two signal line to be connected with backlight module, and can make the module design of drive circuit and reduce production costs.
More than be preferred embodiment of the present utility model, all changes of doing according to technical solution of the present invention when the function that is produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (10)
1, a kind of interface integrated circuit that is used for backlight system of light-emitting diode is characterized in that described backlight system of light-emitting diode includes a plurality of LED source, and described interface integrated circuit comprises:
First input end is in order to receive voltage signal;
Second input is in order to receive dim signal;
Voltage is to current conversion unit, and this voltage to current conversion unit is electrically connected at described first input end, with according to described voltage signal, produces a reference current;
Current balancing unit, this current balancing unit is electrically connected at described voltage to current conversion unit, with according to described reference current, produces a plurality of drive currents, and control the size of current of described a plurality of drive currents, to drive described a plurality of LED source; And
Dimming control switch, this dimming control switch are electrically connected at described second input and described current balancing unit, with according to described dim signal, control the running of described current balancing unit, to adjust the brightness of described a plurality of LED source.
2, the interface integrated circuit that is used for backlight system of light-emitting diode according to claim 1, it is characterized in that, also comprise a variable resistor, described variable resistor is electrically connected at described voltage between current conversion unit and the described current balancing unit, to adjust the size of described reference current.
3, the interface integrated circuit that is used for backlight system of light-emitting diode according to claim 1 is characterized in that, described current balancing unit is a current mirroring circuit, and described current balancing unit comprises:
One the first transistor, first end of this first transistor is electrically connected at described voltage to current conversion unit, and second end is electrically connected at systematically end, and the 3rd end is electrically connected at described first end; And
A plurality of transistor secondses, first end of each transistor seconds is electrically connected at each LED source, second end is electrically connected at described systematically end by described dimming control switch, and the 3rd end is electrically connected at first end and the 3rd end of described the first transistor.
4, the interface integrated circuit that is used for backlight system of light-emitting diode according to claim 3, it is characterized in that, described the first transistor and each transistor seconds are all the two-carrier junction transistor, and the electrical characteristic of each transistor seconds is all identical with described the first transistor.
5, the interface integrated circuit that is used for backlight system of light-emitting diode according to claim 1, it is characterized in that, described voltage signal is a direct current voltage signal that is produced by an electric pressure converter, described dim signal is a pulse wave width modulation signal that is produced by a controller of pulse width modulation, described dimming control switch is controlled the electric connection that described current balancing unit and is systematically held according to the pulse bandwidth of described dim signal.
6, a kind of backlight system of light-emitting diode, it is characterized in that, comprise a plurality of LED source and an interface integrated circuit, described interface integrated circuit is electrically connected at described a plurality of LED source, with according to a voltage signal and a dim signal, produce a plurality of drive currents, to drive described a plurality of LED source.
7, backlight system of light-emitting diode according to claim 6 is characterized in that, described interface integrated circuit comprises:
First input end is in order to receive voltage signal;
Second input is in order to receive dim signal;
Voltage is to current conversion unit, and this voltage to current conversion unit is electrically connected at described first input end, with according to described voltage signal, produces a reference current;
Current balancing unit, this current balancing unit is electrically connected at described voltage to current conversion unit, with according to described reference current, produces a plurality of drive currents, and control the size of current of described a plurality of drive currents, to drive described a plurality of LED source; And
Dimming control switch, this dimming control switch are electrically connected at described second input and described current balancing unit, with according to dim signal, control the running of described current balancing unit, to adjust the brightness of described a plurality of LED source.
8, backlight system of light-emitting diode according to claim 7, it is characterized in that, described interface integrated circuit also comprises a variable resistor, described variable resistor is electrically connected at described voltage between current conversion unit and the described current balancing unit, is used for adjusting the size of described reference current.
9, backlight system of light-emitting diode according to claim 7 is characterized in that, described current balancing unit is a current mirroring circuit, and described current balancing unit comprises:
One the first transistor, first end of this first transistor is electrically connected at described voltage to current conversion unit, and second end is electrically connected at systematically end, and the 3rd end is electrically connected at described first end; And
A plurality of transistor secondses, first end of each transistor seconds is electrically connected at each LED source, and second end is electrically connected at systematically end by described dimming control switch, and the 3rd end is electrically connected at first end and the 3rd end of described the first transistor;
Described the first transistor and each transistor seconds are all the two-carrier junction transistor, and the electrical characteristic of each transistor seconds is all identical with described the first transistor.
10, backlight system of light-emitting diode according to claim 6, it is characterized in that, described voltage signal and described dim signal are produced by the one drive circuit of described backlight system of light-emitting diode, and described drive circuit comprises an electric pressure converter and a controller of pulse width modulation; Described voltage signal is a direct current voltage signal that is produced by described electric pressure converter, described dim signal is a pulse wave width modulation signal that is produced by described controller of pulse width modulation, described dimming control switch is controlled the electric connection that described current balancing unit and is systematically held according to the pulse bandwidth of described dim signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201380394U CN201403234Y (en) | 2009-05-05 | 2009-05-05 | Interface integrated circuit used for LED backlight system and backlight system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201380394U CN201403234Y (en) | 2009-05-05 | 2009-05-05 | Interface integrated circuit used for LED backlight system and backlight system thereof |
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| CN201403234Y true CN201403234Y (en) | 2010-02-10 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102298909A (en) * | 2010-06-22 | 2011-12-28 | 神讯电脑(昆山)有限公司 | Brilliance calibration system of liquid crystal display device |
| CN102446491A (en) * | 2010-10-08 | 2012-05-09 | 联咏科技股份有限公司 | Integrated backlight driving chip and light emitting diode backlight device |
| CN102708831A (en) * | 2012-06-21 | 2012-10-03 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display module and manufacture method thereof |
| CN102708809A (en) * | 2012-06-21 | 2012-10-03 | 深圳市华星光电技术有限公司 | LED backlight drive circuit, liquid crystal display device and production method |
| CN102737601A (en) * | 2012-06-21 | 2012-10-17 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight driving circuit, liquid crystal display device and manufacturing method |
| CN102779486A (en) * | 2012-08-03 | 2012-11-14 | 福建捷联电子有限公司 | LED (Light-Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
| WO2013166737A1 (en) * | 2012-05-09 | 2013-11-14 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, liquid crystal display device, and driving method |
| US8896517B2 (en) | 2010-09-23 | 2014-11-25 | Novatek Microelectronics Corp. | Integrated backlight driving chip and LED backlight device |
| CN111798803A (en) * | 2020-07-07 | 2020-10-20 | Tcl华星光电技术有限公司 | LED backlight driving circuit, backlight module and liquid crystal display device |
| CN114333707A (en) * | 2020-09-29 | 2022-04-12 | 中强光电股份有限公司 | Driving device and driving method of backlight module |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102298909A (en) * | 2010-06-22 | 2011-12-28 | 神讯电脑(昆山)有限公司 | Brilliance calibration system of liquid crystal display device |
| US8896517B2 (en) | 2010-09-23 | 2014-11-25 | Novatek Microelectronics Corp. | Integrated backlight driving chip and LED backlight device |
| CN102446491A (en) * | 2010-10-08 | 2012-05-09 | 联咏科技股份有限公司 | Integrated backlight driving chip and light emitting diode backlight device |
| CN105590589A (en) * | 2010-10-08 | 2016-05-18 | 联咏科技股份有限公司 | Integrated backlight driving chip and light emitting diode backlight device |
| WO2013166737A1 (en) * | 2012-05-09 | 2013-11-14 | 深圳市华星光电技术有限公司 | Led backlight driving circuit, liquid crystal display device, and driving method |
| CN102708809A (en) * | 2012-06-21 | 2012-10-03 | 深圳市华星光电技术有限公司 | LED backlight drive circuit, liquid crystal display device and production method |
| US8890415B2 (en) | 2012-06-21 | 2014-11-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight driving circuit, LCD module, and manufacturing method thereof |
| CN102737601A (en) * | 2012-06-21 | 2012-10-17 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight driving circuit, liquid crystal display device and manufacturing method |
| US8907593B2 (en) | 2012-06-21 | 2014-12-09 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Driving circuit for LED backlight, LCD device, and method for manufacturing driving circuit for LED backlight |
| CN102737601B (en) * | 2012-06-21 | 2015-07-15 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight driving circuit, liquid crystal display device and manufacturing method |
| CN102708831A (en) * | 2012-06-21 | 2012-10-03 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display module and manufacture method thereof |
| CN102779486A (en) * | 2012-08-03 | 2012-11-14 | 福建捷联电子有限公司 | LED (Light-Emitting Diode) driving circuit capable of regulating current balance by negative voltage |
| CN111798803A (en) * | 2020-07-07 | 2020-10-20 | Tcl华星光电技术有限公司 | LED backlight driving circuit, backlight module and liquid crystal display device |
| US11877365B2 (en) | 2020-07-07 | 2024-01-16 | Tcl China Star Optoelectronics Technology Co., Ltd. | LED backlight driving circuit, backlight module and liquid crystal display device |
| CN114333707A (en) * | 2020-09-29 | 2022-04-12 | 中强光电股份有限公司 | Driving device and driving method of backlight module |
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Effective date of registration: 20130604 Address after: 350015 No. 1 Xingye Road, Mawei Science Park, Fujian, Fuzhou Patentee after: Fuzhou Huaying Video & Telecom Co., Ltd. Address before: 350015 No. 1 Xingye Road, Mawei Science Park, Fujian, Fuzhou Patentee before: Fuzhou Huaying Video & Telecom Co., Ltd. Patentee before: Chunghwa Picture Tubes Ltd. |
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