CN102779484B - Control method for backlight module control system - Google Patents
Control method for backlight module control system Download PDFInfo
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- CN102779484B CN102779484B CN201210227577.7A CN201210227577A CN102779484B CN 102779484 B CN102779484 B CN 102779484B CN 201210227577 A CN201210227577 A CN 201210227577A CN 102779484 B CN102779484 B CN 102779484B
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- backlight
- voltage
- secondary module
- signal
- current
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Abstract
The invention provides a backlight module control system which comprises a plurality of backlight hypomodules, a control signal output unit, a voltage converter and a plurality of current control units. The control signal output unit is used for providing a voltage control signal, a current control signal and a plurality of pulse width modulating signals, the voltage converter is used for outputting an output voltage to the plurality of backlight hypomodules according to the voltage control signal, each current control unit can determine a current of a corresponding backlight hypomodule according to the current control signal, each current control unit can determine whether the corresponding backlight hypomodule can be enabled or not according to a corresponding pulse width modulating signal, and besides, only one backlight hypomodule among the plurality of backlight hypomodules can be enabled at the same time.
Description
The present invention is that application number is 200910051694.0, the applying date is the divisional application of on 05 21st, 2009, the denomination of invention Chinese invention patent application that is " electric pressure converter, backlight module control system and control method thereof ".
Technical field
The invention relates to electric pressure converter and backlight module control system, relate in particular to a kind of DC-DC voltage converter and use this electric pressure converter and utilize look order method (color sequential method) to drive the backlight module control system of panel of LCD.
Background technology
Due to the light emitting diode of the different colours difference on processing procedure and on material, the forward voltage of light emitting diode junction also can be different, therefore, in the time that the light emitting diode of different colours is built on same backlight module, the needed operating voltage of light emitting diode of different colours is also different, and therefore backlight module control system can need multiple electric pressure converters so that the required operating voltage of light emitting diode of different colours to be provided.Please refer to Fig. 1, Fig. 1 is the schematic diagram of existing backlight module control system 100.As shown in Figure 1, backlight module control system 100 comprises a power supply unit 110, a plurality of electric pressure converter 120_1～120_N, a plurality of backlight secondary module 130_1～130_N and a plurality of resistance R
1～R
n, wherein each backlight secondary module 130_1～130_N comprises a plurality of light emitting diodes.
In the operation of existing backlight module control system 100, electric pressure converter 120_1～120_N is that the input voltage that power supply unit 110 is provided is converted to the required operating voltage of corresponding backlight secondary module 130_1～130_N, to drive corresponding backlight secondary module 130_1～130_N.But, because need multiple electric pressure converters, therefore can increase the manufacturing cost of backlight module control system.
Summary of the invention
The object of this invention is to provide backlight module control system and the control method thereof of an electric pressure converter of a kind of needs, to solve the above problems.
For achieving the above object, the present invention adopts following technical scheme:
A kind of electric pressure converter, comprises a comparer, a sawtooth generator, a transduction amplifier, a pulse width modulation signal generator, an inductance, a current limit circuit and a circuit of output terminal.This comparer is used for comparison one reference voltage and a feedback voltage to produce one first electric current, this sawtooth generator is used for according to this reference voltage to produce a sawtooth current, this transduction amplifier is used for according to an input voltage to produce one second electric current, this pulse width modulation signal generator is used for according to this first electric current, this sawtooth current and this second electric current are to produce a pulse width modulation signal, this current limit circuit is used for limiting the electric current on this inductance, and this circuit of output terminal be used for according to from the electric current on this inductance to produce an output voltage and this feedback voltage.
A kind of backlight module control system, comprises a plurality of backlight secondary modules, a control signal output unit, an electric pressure converter and a plurality of current control unit.This control signal output unit is used to provide a voltage control signal, a current controling signal and a plurality of pulse width modulation signal; This electric pressure converter is coupled to this control signal output unit and this plurality of backlight secondary modules, and is used for according to this voltage control signal to export an output voltage to these a plurality of backlight secondary modules; These a plurality of current control units are coupled to respectively this plurality of backlight secondary modules, and each current control unit decides the electric current of a corresponding backlight secondary module according to this current controling signal, and decide the whether activation of this corresponding backlight secondary module according to a corresponding pulse width modulation signal, in addition, these a plurality of backlight secondary modules only have a backlight secondary module at one time and are enabled.
A control method for backlight module control system, comprising: a voltage control signal, a current controling signal and a plurality of pulse width modulation signal are provided; According to this voltage control signal to export an output voltage to a plurality of backlight secondary modules; Decide the electric current of a corresponding backlight secondary module according to this current controling signal; And decide the whether activation of this corresponding backlight secondary module according to the corresponding pulse width modulation signal in these a plurality of pulse width modulation signals, wherein these a plurality of backlight secondary modules only have a backlight secondary module at one time and are enabled.
The control signal that backlight module control system provided by the present invention and control method thereof utilize control signal output unit to export, just can under the situation that only uses an electric pressure converter, provide these a plurality of backlight secondary modules required operating voltage, to drive in proper order this plurality of backlight secondary modules.Because backlight module control system of the present invention only needs an electric pressure converter, therefore, compared to the known backlight module control system of the multiple electric pressure converters of needs, the present invention can reduce manufacturing cost really significantly.In addition,, because these a plurality of backlight secondary modules in the present invention drive in proper order, electric pressure converter provided by the present invention can provide voltage transitions fast, to export correct voltage.
Brief description of the drawings
Fig. 1 is the schematic diagram of prior art backlight module control system;
Fig. 2 is the schematic diagram of backlight module control system one embodiment of the present invention;
Fig. 3 is the sequential chart of the control signal of backlight module control system shown in Fig. 2;
Fig. 4 is the voltage quasi position schematic diagram of the input/output signal of first, second digital analog converter shown in Fig. 2 and electric pressure converter;
Fig. 5 is the schematic diagram of the electric pressure converter shown in Fig. 2;
Fig. 6 is the sequential chart of the electric pressure converter shown in Fig. 5 at the signal in each stage.
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of backlight module control system 200 1 embodiment of the present invention.
As shown in Figure 2, backlight module control system 200 comprises a power supply unit 210, one electric pressure converter 220, one control signal output unit 270, a plurality of backlight secondary modules (the present embodiment is used as example explanation with 3 backlight secondary module 230_1～230_3) and a plurality of current control unit (the present embodiment is used as example explanation with 3 current control unit 260_1～260_3), wherein control signal output unit 270 comprises a processor 240, one first digital analog converter 250_1 and one second digital analog converter 250_2, and backlight secondary module 230_1 is a green colored backlights source secondary module that comprises a plurality of green LEDs, backlight secondary module 230_2 is a red backlight secondary module that includes a plurality of red light emitting diodes, and backlight secondary module 230_3 is a Blue backlight secondary module that comprises a plurality of blue LEDs.In addition, backlight module control system 200 is to be applied to the panel of LCD driving with look order method, and namely a plurality of backlight secondary module 230_1～230_3 only have a backlight secondary module at one time and are enabled.
Please also refer to Fig. 2, Fig. 3 and Fig. 4, Fig. 3 is the sequential chart of the control signal of backlight module control system 200 shown in Fig. 2, and Fig. 4 is the voltage quasi position schematic diagram of the input/output signal of the 250_1 of first, second digital analog converter shown in Fig. 2,250_2 and electric pressure converter 220.In the operation of backlight module control system 200, first, in time T
1in, the one first digital signal D that the first digital analog converter 250_1 receiving processor 240 is exported
a0, to produce a voltage control signal V
ref_1, afterwards, electric pressure converter is according to voltage control signal V
ref_1and the input voltage V that provides of power supply unit 210
into produce an output voltage V
out, at this moment, the first digital signal D
a0for low level (namely digital signal " 0 "), voltage control signal V
ref_1voltage quasi position be V
refHand output voltage V
outvoltage quasi position be V
01, wherein V
01for the required operating voltage of green colored backlights source secondary module 230_1; In addition two the second digital signal D that, the second digital analog converter 250_2 receiving processor 240 is exported
r0, D
r1to produce a current controling signal V
ref_2, current control unit 260_1 is according to current controling signal V afterwards
ref_2make corresponding green colored backlights source secondary module 230_1 there is electric current I
g, at this moment, the second digital signal D
r0, D
r1be low level (being namely digital signal " 0 "), and current controling signal V
ref_2voltage quasi position be V
21; In addition, current control unit 260_1～260_3 a plurality of pulse width modulations (Pulse Width Modulation, PWM) signal that also receiving processor 240 provides respectively (is three pulse width modulation signal V at the present embodiment
dmG, V
dmR, V
dmB) to determine the whether activation of corresponding backlight secondary module, in time T
1in, because only have green colored backlights source secondary module 230_1 to be enabled, therefore pulse width modulation signal V
dmR, V
dmBfor low-voltage level (namely not activation of backlight secondary module 230_2,230_3), and pulse width modulation signal V
dmGexcept the secondary module 230_1 of activation green colored backlights source, also there is the function of light modulation.
In time T
2in, the first digital signal D
a0for high levle (namely digital signal " 1 "), therefore voltage control signal V
ref_1voltage quasi position be V
refL, and output voltage V
outvoltage quasi position be V
02, wherein V
02for the required operating voltage of red backlight secondary module 230_2; In addition the second digital signal D,
r0, D
r1be respectively low, high levle (being namely respectively digital signal " 0 ", " 1 "), and current controling signal V
ref_2voltage quasi position be V
22, therefore, current control unit 260_2 is according to current controling signal V
ref_2make corresponding red backlight secondary module 230_2 there is electric current I
r; In addition, in time T
2in, because only have red backlight secondary module 230_2 to be enabled, therefore pulse width modulation signal V
dmG, V
dmBto be low-voltage level (that is to say backlight secondary module 230_1, not activation of 230_3), and pulse width modulation signal V
dmRexcept the secondary module 230_2 of activation green colored backlights source, also there is the function of light modulation.
Similarly, in time T
3in, the first digital signal D
a0for low level (namely digital signal " 0 "), therefore voltage control signal V
ref_1voltage quasi position be V
refH, and output voltage V
outvoltage quasi position be V
01, wherein V
01for the required operating voltage of Blue backlight secondary module 230_3; In addition the second digital signal D,
r0, D
r1be respectively high and low level (that is to say and be respectively digital signal " 1 ", " 0 "), and current controling signal V
ref_2voltage quasi position be V
23, therefore, current control unit 260_3 is according to current controling signal V
ref_2make corresponding Blue backlight secondary module 230_3 there is electric current I
b; In addition, in time T
3in, because only have Blue backlight secondary module 230_3 to be enabled, therefore pulse width modulation signal V
dmG, V
dmRfor low-voltage level (that is to say backlight secondary module 230_1, not activation of 230_2).
In addition time T,
1to T
3be a picture frame time (frame time), that is to say that green colored backlights source secondary module 230_1, red backlight secondary module 230_2 and Blue backlight secondary module 230_3 circulate and are enabled within the picture frame time.
In addition the first digital signal D shown in Fig. 4,
a0, voltage control signal V
ref_1and output voltage V
outbetween change that to close be only an example explanation, on the implementation, as long as output voltage V
outmeet an operating voltage of the backlight secondary module of required driving, digital signal D
a0and voltage control signal V
ref_1can set according to deviser's consideration; In like manner, as long as the electric current of backlight secondary module 230_1～230_3 is I
g, I
r, I
b, the second digital signal D
r0, D
r1and current controling signal V
ref_2also can be set according to deviser's consideration.
Should be noted, in the present embodiment, because the operating voltage of green colored backlights source secondary module 230_1 and Blue backlight secondary module 230_3 is identical, therefore processor 240 is only exported a first digital signal D
a0, but if green colored backlights source secondary module 230_1 and Blue backlight secondary module 230_3 need different operating voltages, processor is exportable two or more the first digital signal also, to make voltage control signal V
ref_1and output voltage V
outhave at least three voltage quasi positions, to drive backlight secondary module 230_1～230_3, and these variations that design also belong to category of the present invention.
In addition, in the present invention, voltage control signal V
ref_1and current controling signal V
ref_2the the first digital signal D being exported by processor 240 respectively
a0, the second digital signal D
r0, D
r1produce via digital analog converter, but processor 240 also can direct voltage output control signal V
ref_1and current controling signal V
ref_2, in addition, the first digital analog converter 250_1 also can be integrated in electric pressure converter 220, and these variations that design also belong to category of the present invention.
In addition, because backlight module control system of the present invention is to be applied to the panel of LCD that look order method drives, therefore electric pressure converter needs very fast slewing rate, but, the DC-DC electric pressure converter of prior art is because be limited to the low frequency range of system, therefore as voltage control signal V
ref_1while changing, the electric pressure converter of prior art cannot immediate response to export correct output voltage, therefore the present invention proposes a kind of electric pressure converter in addition can switch to rapidly required output voltage.
Please refer to Fig. 5, Fig. 5 is the schematic diagram of the electric pressure converter 220 shown in Fig. 2.As shown in Figure 5, electric pressure converter 220 comprises a comparer 510, a sawtooth generator 520, a transduction amplifier 530, a bleeder circuit 532, a pulse width modulation signal generator 540, an inductance L, a current limit circuit 550 and a circuit of output terminal 560, wherein current limit circuit 550 comprise a comparer 552, a flip-flop 554, one with (an AND gate) 556, one drive circuit 558, a transistor MN
1an and resistance R
l1, and circuit of output terminal 560 comprises a Schottky diode (Schottky diode) 562, a capacitor C
loadand a bleeder circuit 564, wherein bleeder circuit 564 comprises two resistance R
f1and R
f2.
Please also refer to Fig. 5 and Fig. 6, Fig. 6 is the sequential chart of the electric pressure converter 220 shown in Fig. 5 at the signal in each stage.At first stage S1, the output voltage V of system
outequal the V shown in Fig. 3
02and maintain a stable state, and pulse width modulation signal V
pWMresponsibility cycle (Duty cycle) also in steady state (SS), now, voltage control signal V
ref_1v
refL, and feedback voltage V
fbalso equal (or very approaching) V
refL; In subordinate phase S2, voltage control signal V
ref_1moment becomes higher magnitude of voltage V
refH, now, comparer 510 comparative voltage control signal V
ref_1and feedback voltage V
fbto produce one first electric current I
c, and sawtooth generator 520 is also according to voltage control signal V
ref_1to produce the sawtooth current I with larger up-and-down boundary
a, in addition, transduction amplifier 530 is according to the voltage b*V from bleeder circuit 532
into produce one second electric current I
ad(b=R in this example,
f1/ (R
f1+ R
f2)); Afterwards, pulse width modulation signal generator 540 is according to the first electric current I
c, sawtooth current I
aand second electric current I
adproduce pulse width modulation signal V
pWM; From the above as voltage control signal V
ref_1while changing to upper reference value, I
c+ I
adbecome fast small electric stream and I
aalso form fast high current, by I
c+ I
adwith I
acompare, can make pulse width modulation signal V
pWMchange fast and maintain high levle, and due to V
pWMat high levle, make the complete conducting of transistor MN1.
In the time of the complete conducting of transistor MN1, the voltage quasi position of node Node1 can be down to and be approached ground voltage, causes inductive current I and inductance L both sides moment is had compared with large voltage difference
lfast rise, in order to prevent inductive current I
ltoo high and burn out whole circuit, therefore as inductive current I
l connectsclosely set a predetermined value (namely maximum current) time, current limit circuit 550 can hard closing transistor MN1, in the time that transistor MN1 closes, inductive current I
lenergy also therefore transmit its energy to external capacitive C by Schottky diode 562
load, now the input anode of the comparer 552 in current limit circuit 550 can get back to zero, and in this example, a reference voltage V of the input negative terminal of comparer 552
refCLbe set as 0.2V, the relatively rear voltage V that therefore comparer 552 is exported
clothrough flip-flop 554, the closing or opening with control transistor MN1 with door 556 and driving circuit 558, can make transistor MN1 open once again Deng next cycle, and form a current limit circuit loop, and whole electric pressure converter 220 changes by current limit circuit and is controlled.At this moment, inductive current I
lthe highest output current (namely this predetermined value) can be maintained, and output voltage V can be made
outcan reach rapidly required voltage quasi position.
At phase III S
3in, work as output voltage V
outwhile approaching the needed driving voltage value of backlight secondary module, (be V shown in Fig. 3 in this example
01), output voltage V
outthe feedback voltage V producing via bleeder circuit 564
fbcan gradually approach voltage control signal V
ref_1(V
refH), and the first electric current I now
ccan be down to fast 0, make pulse width modulation signal V
pWMcan switch back rapidly the correct cycle.
At fourth stage S
4in, voltage control signal V
ref_1moment becomes lower magnitude of voltage V
refL, now, I
c+ I
adbecome fast compared with large electric current and Ia also forms reduced-current fast, by I
c+ I
adwith I
acompare, can make pulse width modulation signal V
pWMchange fast and maintain minimum level, and due to pulse width modulation signal V
pWMin minimum level, can make transistor MN
1close, and output voltage V now
outcan decline.
At five-stage S
5in, work as output voltage V
outwhile approaching the needed driving voltage value of backlight secondary module, (be the V shown in Fig. 3 in this example
02), output voltage V
outthe feedback voltage V producing via bleeder circuit 564
fbcan gradually approach voltage control signal V
ref_1(V
refL), and the first electric current I now
ccan be down to fast 0, make pulse width modulation signal V
pWMcan switch back rapidly the correct cycle.
In sum, backlight module control system of the present invention is to be applied to the panel of LCD driving with look order method, compared to the backlight module control system of prior art, the present invention only needs an electric pressure converter, and this electric pressure converter has voltage conversioning rate faster, therefore the manufacturing cost that really reduces backlight module in display quality situation can not reduced.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. a control method for backlight module control system, is characterized in that, comprising:
One voltage control signal, a current controling signal and a plurality of pulse width modulation signal are provided;
According to this voltage control signal to export an output voltage to a plurality of backlight secondary modules;
Decide the electric current of a corresponding backlight secondary module according to this current controling signal; And
Decide the whether activation of this corresponding backlight secondary module according to the corresponding pulse width modulation signal in these a plurality of pulse width modulation signals;
Wherein these a plurality of backlight secondary modules only have a backlight secondary module at one time and are enabled, and described a plurality of backlight secondary module is by activation in proper order within the picture frame time, and described output voltage is corresponding required different operating voltage in a plurality of backlight secondary module processes described in activation in proper order.
2. control method as claimed in claim 1, is characterized in that, also comprises:
One red backlight secondary module, a green colored backlights source secondary module and a Blue backlight secondary module are set using as these a plurality of backlight secondary modules, and this redness backlight secondary module comprises at least one red light emitting diodes, this green colored backlights source secondary module comprises at least one green LED and this Blue backlight secondary module comprises at least one blue LED, this redness backlight secondary module of activation, this green colored backlights source secondary module and this Blue backlight secondary module in proper order within the picture frame time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210227577.7A CN102779484B (en) | 2009-05-21 | 2009-05-21 | Control method for backlight module control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210227577.7A CN102779484B (en) | 2009-05-21 | 2009-05-21 | Control method for backlight module control system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100516940A Division CN101895194B (en) | 2009-05-21 | 2009-05-21 | Voltage converter, backlight module control system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102779484A CN102779484A (en) | 2012-11-14 |
| CN102779484B true CN102779484B (en) | 2014-12-10 |
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| CN105336299A (en) * | 2015-11-20 | 2016-02-17 | 安徽朗格暖通设备有限公司 | Backlight control circuit, chip and device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6069448A (en) * | 1997-10-16 | 2000-05-30 | Twinhead International Corp. | LCD backlight converter having a temperature compensating means for regulating brightness |
| US7102339B1 (en) * | 2003-01-21 | 2006-09-05 | Microsemi, Inc. | Method and apparatus to switch operating modes in a PFM converter |
| TW200809756A (en) * | 2006-06-29 | 2008-02-16 | Samsung Electro Mech | Liquid crystal display backlight driving system with light emitting diodes |
| TW200816115A (en) * | 2006-09-22 | 2008-04-01 | Univ Chung Yuan Christian | Constant current circuit for backlight module |
| CN101169918A (en) * | 2006-10-23 | 2008-04-30 | 中华映管股份有限公司 | Light source drive circuit |
| CN101312001A (en) * | 2007-05-22 | 2008-11-26 | 中华映管股份有限公司 | Back light device and its brightness control circuit control method |
-
2009
- 2009-05-21 CN CN201210227577.7A patent/CN102779484B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6069448A (en) * | 1997-10-16 | 2000-05-30 | Twinhead International Corp. | LCD backlight converter having a temperature compensating means for regulating brightness |
| US7102339B1 (en) * | 2003-01-21 | 2006-09-05 | Microsemi, Inc. | Method and apparatus to switch operating modes in a PFM converter |
| TW200809756A (en) * | 2006-06-29 | 2008-02-16 | Samsung Electro Mech | Liquid crystal display backlight driving system with light emitting diodes |
| TW200816115A (en) * | 2006-09-22 | 2008-04-01 | Univ Chung Yuan Christian | Constant current circuit for backlight module |
| CN101169918A (en) * | 2006-10-23 | 2008-04-30 | 中华映管股份有限公司 | Light source drive circuit |
| CN101312001A (en) * | 2007-05-22 | 2008-11-26 | 中华映管股份有限公司 | Back light device and its brightness control circuit control method |
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|---|---|
| CN102779484A (en) | 2012-11-14 |
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