CN102592548A - Multi-path lamp strip driving method of liquid crystal display, apparatus thereof and liquid crystal television - Google Patents
Multi-path lamp strip driving method of liquid crystal display, apparatus thereof and liquid crystal television Download PDFInfo
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- CN102592548A CN102592548A CN201210049068XA CN201210049068A CN102592548A CN 102592548 A CN102592548 A CN 102592548A CN 201210049068X A CN201210049068X A CN 201210049068XA CN 201210049068 A CN201210049068 A CN 201210049068A CN 102592548 A CN102592548 A CN 102592548A
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Abstract
The invention discloses a multi-path lamp strip driving method of a liquid crystal display, an apparatus thereof and a liquid crystal television, and mainly provides a method for carrying out asynchronous power-up on a plurality of paths of lamp strips to reduce rate of change of integral lamp strip state, an apparatus thereof and a liquid crystal television set which applies the apparatus. The multi-path lamp strip driving apparatus comprises a power supply, n paths of constant current sources which are electrically connected with the power supply and n paths of lamp strips which are respectively connected with each path of constant current source, and provides electric energy for n lamp strips respectively. The driving method of a plurality of paths of lamp strips is that changing a power supply phase of at least one path of constant current source which is controlled by utilizing a switch signal and supplies power to the lamp strips, thus the power supply phase is different from power supply phases of other paths of constant current sources which supply power to the lamp strips. The method for driving the lamp strips is used for a light modulation state of the liquid crystal television, the stability of a system can be effectively ensured, and service lives of the power supply and a driver are prolonged.
Description
Technical field
The present invention relates to a kind of multichannel lamp bar driving method and device, LCD TV of LCD.
Background technology
At present; Because what most LED dimming state adopted all is the method for single channel PWM control light modulation, this light-dimming method is applied in the light adjusting circuit that comprises LED multi-path lamp string equally, causes LED multi-path lamp switch simultaneously; The variation of single LED lamp bar is exactly 0% and 100% fluctuation that do not stop like this; The rate of change of overall lamp bar is exactly the stack of multichannel lamp bar rate of change, and the overall lamp bar has a very big fluctuation, in addition because the characteristic of LED lamp has determined it to need the constant current power supply; Overall lamp bar rate of change is excessive; Totally unfavorable to stablizing of constant current power supply regulating system, cause total system unstable easily, this kind device and light-dimming method are applied to be prone in the LCD TV cause the instability of liquid crystal TV set total system.
Summary of the invention
To the problems referred to above, the present invention provides in a kind of driving process of the multichannel lamp bar at LCD, can reduce overall lamp bar rate of change control method, realize the device of this method and use the LCD TV of this device.
For achieving the above object, the multichannel lamp bar drive controlling method of LCD of the present invention, said LCD comprises a power supply, the constant current source on this power supply output n road is respectively n bar lamp bar provides electric energy, forms n current supply circuit; It is characterized in that: change the power supply phase place that at least one road utilizes switching signal control, make it different with the power supply phase place of the constant current source of other road direction lamp bar power supplies to the constant current source of lamp bar power supply; Wherein n is the integer greater than 1.
Further, change the power supply phase place that the m road utilizes switching signal control, make it to have nothing in common with each other to the constant current source of lamp bar power supply, and inequality with the power supply phase place of the constant current source of other road direction lamp bars power supplies respectively; Wherein m is greater than 1 integer smaller or equal to n, and n is the number of current supply circuit.
Further, change the power supply phase place to the constant current source of lamp bar power supply that the n-1 road utilizes switching signal control, the minimum phase difference between each road constant current source of change specifically is expressed as following formula through the number decision of current supply circuit:
ΔT＝T/n
Wherein, the minimum phase difference between each road constant current source of Δ T-;
T-lamp bar power supply period of change;
The number of n-current supply circuit.
Particularly, described switching signal is a pwm signal.
Especially, the dutycycle of each way switch control signal pwm signal is identical.
For achieving the above object, the multichannel lamp bar drive unit of LCD of the present invention comprises a power supply, the n road constant current source of said power supply output, and the n street lamp bar that each road constant current source connects forms n current supply circuit; Also comprise a phase control device, be used to change the power supply phase place that at least one road utilizes switching signal control, make it different with the power supply phase place of the constant current source of other road direction lamp bar power supplies to the constant current source of lamp bar power supply; Wherein n is the integer greater than 1.
Further, said phase control device is made up of phase controller and controlled switch, and controlled switch is installed in the current supply circuit, and the phase controller output switching signal is controlled said controlled switch.
Further; Be separately installed with said controlled switch in m the current supply circuit; Said controlled switch is used to receive the switching signal by said phase control device output; Make the m road utilize the power supply phase place to the constant current source of lamp bar power supply of switching signal control to have nothing in common with each other, and also inequality with the power supply phase place of the constant current source of other road direction lamp bars power supplies respectively; Wherein m is greater than 1 less than n, and n is the number of current supply circuit.
For achieving the above object; LCD TV of the present invention; At least comprise LCD, said LCD comprises multichannel lamp bar drive unit at least, it is characterized in that: the multichannel lamp bar drive unit of said LCD is the drive unit of the multichannel lamp bar of above-mentioned LCD.
Further; Said LCD TV also comprises constant-current control circuit; Said constant-current control circuit is realized FEEDBACK CONTROL through voltage feedback circuit and constant current chip, and said voltage feedback circuit comprises auxiliary feedback circuit, and said auxiliary feedback circuit can change the supply voltage of said constant-current control circuit.
The multichannel lamp bar driving method of LCD of the present invention and device, LCD TV; Through changing the control device of original multichannel lamp bar; Become multi-way switch control by same switch control multichannel lamp bar and control multichannel lamp bar respectively; Constant current source through being connected on each street lamp bar provides at least one road power supply phase place different driving methods to each street lamp bar; Reduce the variation of overall load, increased the resistance to overturning of system, this device and method is applied to can effectively increase in the LCD TV stability of televisor electric power system.
Description of drawings
Fig. 1 is first kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is identical, the variation square wave of each road load and total load;
Fig. 2 is first kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is different, the variation square wave of each road load and total load;
Fig. 3 is second kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is identical, the variation square wave of each road load and total load;
Fig. 4 is second kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is different, the variation square wave of each road load and total load;
Fig. 5 is the third embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is identical, the variation square wave of each road load and total load;
Fig. 6 is the third embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is different, the variation square wave of each road load and total load;
Fig. 7 is the third embodiment of the multichannel lamp bar driving method of LCD of the present invention, and 1 tunnel power supply phase place of lamp bar is different, the variation square wave of each road load and total load;
Fig. 8 is the 4th kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is identical, the variation square wave of each road load and total load;
Fig. 9 is the 4th kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is different, the variation square wave of each road load and total load;
Figure 10 is the 5th kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is identical, the variation square wave of each road load and total load;
Figure 11 is the 5th kind of embodiment of the multichannel lamp bar driving method of LCD of the present invention, and each road power supply phase place of lamp bar is different, the variation square wave of each road load and total load;
Figure 12 is the structural representation of the multichannel lamp bar drive unit of LCD of the present invention;
Figure 13 is a kind of electrical block diagram of the constant current feedback circuit among the embodiment of LCD TV of the present invention.
Embodiment
Below in conjunction with Figure of description the present invention is done further description.
The multichannel lamp bar drive controlling method of LCD of the present invention; The multichannel lamp bar drive controlling method of LCD of the present invention; Said LCD comprises a power supply, and the constant current source on this power supply output n road is respectively n bar lamp bar provides electric energy, forms n current supply circuit; It is characterized in that: change the power supply phase place that at least one road utilizes switching signal control, make it different with the power supply phase place of the constant current source of other road direction lamp bar power supplies to the constant current source of lamp bar power supply; Wherein n is the integer greater than 1.
Further, change the power supply phase place that the m road utilizes switching signal control, make it to have nothing in common with each other to the constant current source of lamp bar power supply, and inequality with the power supply phase place of the constant current source of other road direction lamp bars power supplies respectively; Wherein m is greater than 1 integer smaller or equal to n, and n is the number of current supply circuit.
Further, change the power supply phase place to the constant current source of lamp bar power supply that the n-1 road utilizes switching signal control, the minimum phase difference between each road constant current source of change specifically is expressed as following formula through the number decision of current supply circuit:
ΔT＝T/n
Wherein, the minimum phase difference between each road constant current source of Δ T-;
T-lamp bar power supply period of change;
The number of n-current supply circuit.
Further, each way switch control signal is the identical pwm signal of dutycycle.
Shown in figure 11, accordingly, realize the multichannel lamp bar drive unit of LCD of the present invention, comprise a power supply 61, the n road constant current source 62 of said power supply output, the n street lamp bar 64 that each road constant current source connects forms n current supply circuit; Also comprise a phase control device, be used to change the power supply phase place that at least one road utilizes switching signal control, make it different with the power supply phase place of the constant current source of other road direction lamp bar power supplies to the constant current source of lamp bar power supply; Wherein n is the integer greater than 1, and said in addition constant current source both can be that integrated IC also can be the constant-current circuit that discrete device is built into.
Further; Said phase control device is made up of phase controller (not shown) and controlled switch 63; Said controller is a pwm signal generator; This signal generator produces the multi-channel PWM signal, and every road pwm signal is controlled one road controlled switch, is exactly a plurality of controlled switch control multichannel lamp bars like this.Controlled switch is installed in the current supply circuit, and the phase controller output switching signal is controlled said controlled switch.Particularly, said constant current source is that the said controller of constant current control IC is the MCU or the FPGA of the pwm signal of exportable multichannel out of phase, and said lamp bar is a LED lamp bar.
Further; Be separately installed with said controlled switch in m the current supply circuit; Said controlled switch is used to receive the switching signal by said phase control device output; Make the m road utilize the power supply phase place to the constant current source of lamp bar power supply of switching signal control to have nothing in common with each other, and also inequality with the power supply phase place of the constant current source of other road direction lamp bars power supplies respectively; Wherein m is greater than 1 less than n, and n is the number of current supply circuit.
The present invention is applied in the LCD TV; LCD TV; At least comprise LCD, said LCD comprises multichannel lamp bar drive unit at least, the drive unit of the multichannel lamp bar of the LCD that the multichannel lamp bar drive unit of said LCD is above-mentioned.In addition; Said LCD TV also comprises constant-current control circuit; Said constant-current control circuit is realized FEEDBACK CONTROL through voltage feedback circuit and constant current chip, and said voltage feedback circuit comprises auxiliary feedback circuit, and said auxiliary feedback circuit can change the supply voltage of said constant-current control circuit.
Utilize the multichannel lamp bar drive controlling method of LCD of the present invention through contrast below and utilize the contrast of several kinds of embodiment that a PWM controls the lamp bar that the present invention is described.
First kind of embodiment:
Apply the present invention in the LCD TV; Under the 2D state, to the process that the LED lamp carries out light modulation, wherein LED lamp bar 3 road constitutes; The dutycycle of said 3 paths of LEDs lamp bars is 30%; To not utilizing method of the present invention, only utilize a PWM generator to its carry out situation that light modulation drives with utilize according to the invention make phase drift and handle after, the situation contrast that the lamp bar changes.
As shown in Figure 1; All lamp bars are carried out the situation of integrally adjusting light: when first paths of LEDs 11 takes place to change; Second paths of LEDs 12, Third Road LED 13 also change simultaneously; Be exactly adding up of the amplitude three string LED lamp bars that total so lamp bar 14 changes, the amplitude of variation of total lamp bar is just big more in one-period, is unfavorable for stablizing of total system.
As shown in Figure 2, utilize method of the present invention, carry out light modulation; The variation mean allocation of lamp bar was arrived in the whole light modulation cycle; Utilize the computing method Δ T=T/n of phase differential to calculate, obtain Δ T=T/3, in addition because dutycycle is represented the conduction time of LED lamp in one-period; The computing formula of dutycycle is: R=Ton/T, the wherein service time of Ton-led lamp string.Thus, be example with the one-period, the LED time of opening on n road is: (n-1) * Δ T is to (n-1) * Δ T+Ton.
Because dutycycle is 30%, then ON time is 3T/10, invents described method according to this and draws: the service time of first via LED11 is: (1-1) * T/3 that is: 0 arrives 3T/10 to (1-1) * T/3+3T/10.The service time that in like manner can get the second paths of LEDs lamp bar 12 is: T/3 is to 19T/30, and the service time of Third Road LED lamp bar 13 is: 2T/3 is to T.
Can find out clearly that by the contrast of two width of cloth figure overall load rate has become original 1/3.
Second kind of embodiment:
Apply the present invention in the LCD TV; Under the 2D state, to the process that the LED lamp carries out light modulation, wherein LED lamp bar 3 road constitutes; The dutycycle of said 4LED lamp bar is 30%; To not utilizing method of the present invention, only utilize a PWM generator to its carry out situation that light modulation drives with utilize according to the invention make phase drift and handle after, the situation contrast that the lamp bar changes.
Show like Fig. 3; All lamp bars are carried out the situation of integrally adjusting light: when first paths of LEDs 21 takes place to change; Identical variation also takes place in second paths of LEDs 22, Third Road LED 23, the 4th paths of LEDs 24 simultaneously; Be exactly Zong the adding up of the amplitude of variation of lamp bar 25 four string LED lamp bars, the rate of change of total lamp bar is just big more in one-period, is unfavorable for the stable of total system.
As shown in Figure 4; Utilize method of the present invention, carry out light modulation, with the variation mean allocation of lamp bar in the whole light modulation cycle; Utilize the computing method Δ T=T/n of phase differential to calculate; Obtain Δ T=T/4 in addition because dutycycle is represented the conduction time of LED lamp in one-period, the computing formula of dutycycle is: R=Ton/T, the wherein service time of Ton-led lamp string.Thus, be example with the one-period, the LED time of opening on n road is: (n-1) * Δ T is to (n-1) * Δ T+Ton.
Because dutycycle is 30%, then ON time is 3T/10, invents described method according to this and draws: the service time of first paths of LEDs 11 is: (1-1) * T/4 that is: 0 arrives 3T/10 to (1-1) * T/4+3T/10.The service time that in like manner can get second paths of LEDs 22 is: T/3 is to 19T/30, and 23 service times of Third Road LED lamp bar are: T/4 is to 11T/20, and the time that the 4th paths of LEDs 24 is opened is: 3T/4 is to T.
Clearly, in this manner, farthest reduce the rate of change of overall lamp bar 25, also satisfied the constant requirement of whole dutycycle simultaneously, the corresponding lamp status that draws, total lamp bar changes and reduces greatly, and amplitude of variation is similarly original 1/4.
The third embodiment:
Apply the present invention in the LCD TV; Under the 2D state, to the process that the LED lamp carries out light modulation, wherein LED lamp bar 3 road constitutes; The dutycycle of said 3 paths of LEDs lamp bars is 30%; To not utilizing method of the present invention, only utilize a PWM generator to its carry out situation that light modulation drives with utilize according to the invention make phase drift and handle after, the situation contrast that the lamp bar changes.
As shown in Figure 5; All lamp bars are carried out the situation of integrally adjusting light: when first paths of LEDs 31 takes place to change; Second paths of LEDs 32, Third Road LED33 also change simultaneously; Be exactly adding up of the amplitude three string LED lamp bars that total so lamp bar 34 changes, the amplitude of variation of total lamp bar is just big more in one-period, is unfavorable for stablizing of total system.
As shown in Figure 6; Utilize method of the present invention, carry out light modulation, utilize the computing method Δ T=T/n of phase differential to calculate; Obtain Δ T=T/3; Because dutycycle is represented the conduction time of LED lamp in one-period, the computing formula of dutycycle is: R=Ton/T, the service time of Ton-led lamp string in addition.With the one-period is example; The LED time of opening on n road is: (n-1) * Δ T is 50% to (n-1) * Δ T+Ton owing to dutycycle; Then ON time is T/2; Inventing described method according to this draws: the service time of the first paths of LEDs lamp bar 31 is: (1-1) * T/3 that is: 0 arrives T/2 to (1-1) * T/3+T/2.The service time that in like manner can get the second paths of LEDs lamp bar 32 is: T/3 is to 5T/6, and the service time of Third Road LED lamp bar 33 is: 2T/3 is to T.
Clearly, can find out by figure that total lamp bar 34 changes and reduce greatly that amplitude of variation is original 1/3.
As shown in Figure 7, only the power supply phase place of Third Road LED lamp bar changes, and can find out the amplitude of variation that has reduced total load equally by figure.
The 4th kind of embodiment:
Apply the present invention in the LCD TV; Under the 2D state, to the process that the LED lamp carries out light modulation, wherein LED lamp bar 3 road constitutes; The dutycycle of said 3 paths of LEDs lamp bars is 60%; To not utilizing method of the present invention, only utilize a PWM generator to its carry out situation that light modulation drives with utilize according to the invention make phase drift and handle after, the situation contrast that the lamp bar changes.
As shown in Figure 7; All lamp bars are carried out the situation of integrally adjusting light: when first paths of LEDs 41 takes place to change; Second paths of LEDs 42, Third Road LED 43 also change simultaneously; Be exactly adding up of the amplitude three string LED lamp bars that total so lamp bar 44 changes, the amplitude of variation of total lamp bar is just big more in one-period, is unfavorable for stablizing of total system.
As shown in Figure 8, utilize method of the present invention, carry out light modulation; The variation mean allocation of lamp bar was arrived in the whole light modulation cycle; Utilize the computing method Δ T=T/n of phase differential to calculate, obtain Δ T=T/3, in addition because dutycycle is represented the conduction time of LED lamp in one-period; The computing formula of dutycycle is: R=Ton/T, the wherein service time of Ton-led lamp string.Thus, be example with the one-period, the LED time of opening on n road is: (n-1) * Δ T is to (n-1) * Δ T+Ton.
Because dutycycle is 60%, then ON time is 3T/5, invents described method according to this and draws: the service time of first via LED41 is: (1-1) * T/3 that is: 0 arrives 3T/5 to (1-1) * T/3+3T/5.The service time that in like manner can get the second paths of LEDs lamp bar 42 is: T/3 is to 14T/15, and the service time of Third Road LED lamp bar 43 is: 2T/3 is to T.
Can find out clearly that by the contrast of two width of cloth figure rate of change of integral LED 44 has reduced greatly.
The 5th kind of embodiment:
Apply the present invention in the LCD TV; Under the 2D state, to the process that the LED lamp carries out light modulation, wherein LED lamp bar 5 road constitutes; The dutycycle of said 5 paths of LEDs lamp bars is 60%; To not utilizing method of the present invention, only utilize a PWM generator to its carry out situation that light modulation drives with utilize according to the invention make phase drift and handle after, the situation contrast that the lamp bar changes.
As shown in Figure 9; All lamp bars are carried out the situation of integrally adjusting light: when first paths of LEDs 51 takes place to change; Second paths of LEDs 52, Third Road LED 53, the 4th paths of LEDs 54, the 5th paths of LEDs 55 also change simultaneously; Be exactly adding up of the amplitude five string LED lamp bars that total so lamp bar 56 changes, the amplitude of variation of total lamp bar is just big more in one-period, is unfavorable for stablizing of total system.
Shown in figure 10, utilize method of the present invention, carry out light modulation; The variation mean allocation of lamp bar was arrived in the whole light modulation cycle; Utilize the computing method Δ T=T/n of phase differential to calculate, obtain Δ T=T/5, in addition because dutycycle is represented the conduction time of LED lamp in one-period; The computing formula of dutycycle is: R=Ton/T, the wherein service time of Ton-led lamp string.Thus, be example with the one-period, the LED time of opening on n road is: (n-1) * Δ T is to (n-1) * Δ T+Ton.
Because dutycycle is 60%, then ON time is 3T/5, invents described method according to this and draws: the service time of first via LED51 is: (1-1) * T/5 that is: 0 arrives 3T/5 to (1-1) * T/5+3T/5.The service time that in like manner can get the second paths of LEDs lamp bar 52 is: T/5 is to 4T/5, and the service time of Third Road LED lamp bar 53 is: 2T/5 is to T, and the service time of the 4th paths of LEDs lamp bar 54 is: 3T/5 is to T, and the service time of the 5th paths of LEDs lamp bar 55 is: 4T/5 is to T.
Can find out clearly that by the contrast of two width of cloth figure rate of change of integral LED 56 has reduced greatly.
Stereo display has much the gesture that sweeps across whole field, and the 3D technology has been applied in the LCD TV, the available liquid crystal TV can not only accomplish to guarantee system under the 2D state stable the stable of system under the 3D state of also should accomplishing equally.
Shown in figure 12; A kind of simple feedback circuit for the constant-current control circuit of above-mentioned LCD TV; Said constant-current control circuit is realized FEEDBACK CONTROL through voltage feedback circuit 71 and constant current chip 72; Said voltage feedback circuit comprises auxiliary feedback circuit 73, and said auxiliary feedback circuit can change the supply voltage of said constant-current control circuit.
Constant-current control circuit provides the voltage output of load according to the voltage drop adjustment of load, makes linear controller triode or MOS go up the minimum power that dissipates.Therefore the problem that feedback speed and driving voltage output response speed will be mated will appear.If the feedback speed of constant-current control circuit is fast, and driving voltage output response speed can't be caught up with, and electric current will occur and not reach the voltage drop that predetermined value or voltage substantially exceed load, causes system works undesired.Tracing it to its cause just loads on liquid crystal TV set to be under the 3D load variations violent, and under the 3D state, the output voltage of load will significantly promote.This just needs constant current chip 72 to give very big feedback; In feedback circuit 71, increase and to increase the auxiliary feedback circuit 73 of output; Reduce the feedback current of constant current chip output with this, produce switch 74 conductings of the auxiliary feedback circuit of control and the control signal of closing through the PWN generator.Drive output voltage under 2D and be output as 50V, voltage is output as 60V under the 3D.Therefore utilize original technique, constant current chip feedback needs ABSORPTION CURRENT that output voltage is promoted 10V.And utilize this constant-current control circuit, under the 3D state, output voltage is preset to 55V; At this moment the constant current chip only need provide the ABSORPTION CURRENT of 5v, and electric current has reduced one times, reduces the feedback fluctuation of constant-current circuit; Make system more stable; Compatible multiple topology reduces rush of current simultaneously more easily, and the reliability that has increased system has greatly prolonged the life-span of power supply.
More than; Be merely preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Claims (10)
1. the multichannel lamp bar drive controlling method of a LCD, said LCD comprises a power supply, the constant current source on this power supply output n road is respectively n bar lamp bar provides electric energy, forms n current supply circuit; It is characterized in that: change the power supply phase place that at least one road utilizes switching signal control, make it different with the power supply phase place of the constant current source of other road direction lamp bar power supplies to the constant current source of lamp bar power supply; Wherein n is the integer greater than 1.
2. the multichannel lamp bar drive controlling method of LCD according to claim 1; It is characterized in that: change the power supply phase place that the m road utilizes switching signal control to the constant current source of lamp bar power supply; Make it to have nothing in common with each other, and inequality with the power supply phase place of the constant current source of other road direction lamp bars power supply respectively; Wherein m is greater than 1 integer smaller or equal to n.
3. the multichannel lamp bar drive controlling method of LCD according to claim 2; It is characterized in that: change the power supply phase place that the n-1 road utilizes switching signal control to the constant current source of lamp bar power supply; Minimum phase difference between each the road constant current source that changes specifically is expressed as following formula through the number decision of current supply circuit:
ΔT＝T/n
Wherein, the minimum phase difference between each road constant current source of Δ T-;
T-lamp bar power supply period of change;
The number of n-current supply circuit.
4. the multichannel lamp bar drive controlling method of LCD according to claim 3, it is characterized in that: described switching signal is a pwm signal.
5. the multichannel lamp bar drive controlling method of LCD according to claim 4, it is characterized in that: the dutycycle of each way switch control signal pwm signal is identical.
6. the multichannel lamp bar drive unit of a LCD comprises a power supply, the n road constant current source of said power supply output, and the n street lamp bar that each road constant current source connects forms n current supply circuit; It is characterized in that: also comprise a phase control device, be used to change the power supply phase place that at least one road utilizes switching signal control, make it different with the power supply phase place of the constant current source of other road direction lamp bar power supplies to the constant current source of lamp bar power supply; Wherein n is the integer greater than 1.
7. the multichannel lamp bar drive unit of LCD according to claim 6; It is characterized in that: said phase control device is made up of phase controller and controlled switch; Controlled switch is installed in the current supply circuit, and the phase controller output switching signal is controlled said controlled switch.
8. the multichannel lamp bar drive unit of LCD according to claim 7; It is characterized in that: be separately installed with said controlled switch in m the current supply circuit; Said controlled switch is used to receive the switching signal by said phase control device output; Make the m road utilize the power supply phase place to the constant current source of lamp bar power supply of switching signal control to have nothing in common with each other, and also inequality with the power supply phase place of the constant current source of other road direction lamp bars power supplies respectively; Wherein m is greater than 1 less than n, and n is the number of current supply circuit.
9. LCD TV; At least comprise LCD; Said LCD comprises multichannel lamp bar drive unit at least, it is characterized in that: the multichannel lamp bar drive unit of said LCD is the drive unit of the multichannel lamp bar of any described LCD in the claim 5 to 8.
10. LCD TV according to claim 9; Said LCD TV also comprises constant-current control circuit; Said constant-current control circuit is realized FEEDBACK CONTROL through voltage feedback circuit and constant current chip; It is characterized in that: said voltage feedback circuit comprises auxiliary feedback circuit, and said auxiliary feedback circuit can change the supply voltage of said constant-current control circuit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968963A (en) * | 2012-11-30 | 2013-03-13 | 深圳市华星光电技术有限公司 | LED (light-emitting diode) backlight driving circuit, liquid crystal display and driving method |
| CN103165083A (en) * | 2013-03-07 | 2013-06-19 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight drive circuit, liquid crystal display device and drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102968963A (en) * | 2012-11-30 | 2013-03-13 | 深圳市华星光电技术有限公司 | LED (light-emitting diode) backlight driving circuit, liquid crystal display and driving method |
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| CN102968963B (en) * | 2012-11-30 | 2015-07-15 | 深圳市华星光电技术有限公司 | LED (light-emitting diode) backlight driving circuit, liquid crystal display and driving method |
| CN103165083A (en) * | 2013-03-07 | 2013-06-19 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight drive circuit, liquid crystal display device and drive circuit |
| CN103165083B (en) * | 2013-03-07 | 2015-07-15 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) backlight drive circuit, liquid crystal display device and drive circuit |
| CN105513545A (en) * | 2016-02-29 | 2016-04-20 | 京东方科技集团股份有限公司 | Backlight unit and driving method thereof and display device |
| CN105513545B (en) * | 2016-02-29 | 2018-09-11 | 京东方科技集团股份有限公司 | A kind of back light unit and its driving method, display device |
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Application publication date: 20120718 |