CN106658829B - A kind of backlight control circuit and display device - Google Patents
A kind of backlight control circuit and display device Download PDFInfo
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- CN106658829B CN106658829B CN201611015918.9A CN201611015918A CN106658829B CN 106658829 B CN106658829 B CN 106658829B CN 201611015918 A CN201611015918 A CN 201611015918A CN 106658829 B CN106658829 B CN 106658829B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention belongs to display control fields, provide a kind of backlight control circuit and display device.Backlight control circuit provided by the present invention is connected with backlight source module, including AC-DC conversion module, voltage transformation module and flicker frequency control module；Wherein, city's alternating current is converted to the first direct current by AC-DC conversion module, and the first direct current received is converted to the second direct current and the 3rd direct current of predeterminated voltage by voltage transformation module, and using the second direct current as the operating current of backlight source module.In addition, flicker frequency control module includes reference voltage module and main control module, second direct current and the reference voltage are subjected to voltage-contrast using main control module, and the current loop of backlight source module is turned on/cut off according to comparing result, backlight control circuit design provided in an embodiment of the present invention is simple, development cost is reduced, and improves efficiency, reduces power consumption.
Description
Technical field
The invention belongs to display control field, more particularly to a kind of backlight control circuit and display device.
Background technology
It is that work is driven using constant current, so existing in a display device in existing backlight control circuit
Backlight control circuit, for ensuring the stabilization safe operation of display device.
But current backlight control circuit design is complicated, of high cost, and the problem of power consumption is high.
The content of the invention
It is an object of the invention to provide a kind of backlight control circuits, it is intended to solve existing backlight control circuit and set
The problem of meter is complicated, of high cost, and power consumption is high.
In order to solve the above-mentioned technical problem, the present invention is realized in：A kind of backlight control circuit, with backlight mould
Group connection, including AC-DC conversion module and voltage transformation module, the AC-DC conversion module accesses city's alternating current and to institute
It states city's alternating current and carries out AC-DC conversion to export the first direct current, the voltage transformation module receives first direct current,
And first direct current is converted to the second direct current and the 3rd direct current of predeterminated voltage；
First output terminal of the voltage transformation module is the positive output end of the backlight control circuit, connects the back of the body
The anode of light source module group；
The backlight control circuit further includes flicker frequency control module；The power end of the flicker frequency control module
The second output terminal of the voltage transformation module is connected, the input terminal of the flicker frequency control module controls for the backlight
The negative output terminal of circuit, and connect the cathode of the backlight source module；
The flicker frequency control module includes：
Power end is the power end of the flicker frequency control module, accesses the 3rd direct current and output reference voltage
Reference voltage module；And
Reference voltage end connects the output terminal of the reference voltage module, and input terminal is the flicker frequency control module
Second direct current and the reference voltage are carried out voltage-contrast by input terminal, and according to comparing result to the backlight
The current loop of module turn on/cut off the main control module of control.
Another object of the present invention, which also resides in, provides a kind of display device, including backlight source module, further includes the above-mentioned back of the body
Control circuit for light source.
Backlight control circuit provided by the present invention is connected with backlight source module, including AC-DC conversion module, voltage
Modular converter and flicker frequency control module；Wherein, city's alternating current is converted to the first direct current by AC-DC conversion module, electricity
The first direct current received is converted to the second direct current and the 3rd direct current of predeterminated voltage by pressure modular converter, and by second
Operating current of the direct current as backlight source module.In addition, flicker frequency control module includes reference voltage module and master control mould
Second direct current and the reference voltage are carried out voltage-contrast by block using main control module, and turned on according to comparing result/
Cut off the current loop of backlight source module, backlight control circuit provided in an embodiment of the present invention design is simple, reduce exploitation into
This, and efficiency is improved, reduce power consumption.
Description of the drawings
Fig. 1 is the function structure chart for the backlight control circuit that first embodiment of the invention is provided；
Fig. 2 is the exemplary circuit structure chart for the backlight control circuit that first embodiment of the invention is provided；
Fig. 3 is the function structure chart for the backlight control circuit that second embodiment of the invention is provided；
Fig. 4 is the exemplary circuit structure chart for the backlight control circuit that second embodiment of the invention is provided.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The specific implementation of the present invention is described in detail below in conjunction with specific embodiment：
Embodiment 1
Fig. 1 shows the modular structure for the backlight control circuit that the present embodiment is provided, and for convenience of description, only shows
With relevant part of the embodiment of the present invention, details are as follows：
The backlight control circuit that the present embodiment is provided is connected with backlight source module, including 10 He of AC-DC conversion module
Voltage transformation module 20, AC-DC conversion module 10 access city's alternating current and carry out AC-DC conversion to city's alternating current to export the
One direct current, voltage transformation module 20 receive the first direct current, and the first direct current is converted to the second direct current of predeterminated voltage
Electricity and the 3rd direct current.
In the present embodiment, backlight control circuit further includes flicker frequency control module 30, flicker frequency control module
The second output terminal of 30 power end connection voltage transformation module 20.
Specifically, the first output terminal of voltage transformation module 20 is the positive output end of backlight control circuit, backlight is connected
The anode of source module, 30 input terminal of flicker frequency control module are the negative output terminal of backlight control circuit and connect backlight mould
The cathode of group.
In the present embodiment, flicker frequency control module 30 can include：
Power end is the power end of flicker frequency control module 30, accesses the reference of the 3rd direct current and output reference voltage
Voltage module 31；And
Reference voltage end connects the output terminal of reference voltage module 31, and input terminal is the input of flicker frequency control module 30
Second direct current and reference voltage are carried out voltage-contrast by end, and according to comparing result to the current loop of backlight source module into
The main control module 32 of row conducting/cut-out control.
Due to flicker frequency control module 30 using main control module 32 will second direct current and the reference voltage into
Row voltage-contrast, and the current loop of backlight source module according to comparing result is turned on/cuts off, so as to improve in the second direct current
Electric current higher hamonic wave frequency, also reduce the amplitude of electric current higher hamonic wave so that the flicker of backlight source module almost can not
It is detected.
In the present embodiment, as shown in Fig. 2, rectifier bridge BR1 may be employed in AC-DC conversion module 10；
The first input end of rectifier bridge BR1 is connected the firewire and zero curve of city's alternating current, rectifier bridge with the second input terminal respectively
With terminating the first power supply, the output terminal of rectifier bridge BR1 is the output terminal of AC-DC conversion module 10 to the ground connection of BR1.
In addition, AC-DC conversion module 10 can also connect and compose rectifier bridge using 4 diodes.
In the present embodiment, as shown in Fig. 2, reference voltage module 31 can include：
5th resistance R5, the 7th resistance R7, the 9th resistance R9 and controllable accurate source of stable pressure U1；
The first end of 5th resistance R5 is the power end of reference voltage module 31, the second end of the 5th resistance R5, the 7th electricity
It hinders the first end of R7 and the cathode of controllable accurate source of stable pressure U1 is connected to the controlled end of controllable accurate source of stable pressure U1, the 7th resistance altogether
The second end of R7 and the first end of the 9th resistance R9 meet the output terminal to form reference voltage module 31, controllable accurate source of stable pressure U1 altogether
Anode and the 9th resistance R9 second end with being connected to second source altogether.
In the present embodiment, controllable accurate source of stable pressure U1 can be the three-terminal voltage-stabilizing pipe of model TL431.
In the present embodiment, as shown in Fig. 2, main control module 32 can include：
First operational amplifier U2, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the 15th resistance
R15 and the first NMOS tube Q1；
The in-phase end of first operational amplifier U2 is the reference voltage end of main control module 32, and the first operational amplifier U2's is anti-
Xiang Duan, the first end of the 13rd resistance R13, the first end of the 14th resistance R14 are connected to the source electrode of the first NMOS tube Q1 altogether, and first
The output terminal of operational amplifier U2 connects the first end of the 15th resistance R15, the second end of the 15th resistance R15 and the 12nd electricity
The first end of resistance R12 is connected to the grid of the first NMOS tube Q1 altogether, and the drain electrode of the first NMOS tube Q1 is the drain electrode of main control module 32.
In the present embodiment, the 13rd resistance R13 and the 14th resistance R14 be current sampling resistor, the first operation amplifier
The end of oppisite phase of device U2 obtains the voltage on the current sampling resistor, and the voltage and reference voltage are done voltage-contrast.In deep negative
In the case of feedback, the voltage on current sampling resistor is equal to reference voltage.By adjusting the electricity of the 15th resistance R15 and the 12nd
Hinder the resistance value of R12 and the size of reference voltage so that the first operational amplifier U2 exports high level when higher hamonic wave is smaller
Signal, and then make the first NMOS tube Q1 in the conduction state.When having larger higher harmonic current in the second direct current, electricity
Flow the voltage rise on sampling resistor, the first operational amplifier U2 output low level signals, so that the first NMOS tube Q1 occurs
Shut-off.When the first NMOS tube Q1 is turned off, the current loop of backlight source module is cut off, in low on current sampling resistor
Level state so that the first operational amplifier U2 exports high level signal again, turns on the first NMOS tube Q1 again.Due to
This process time is very short, and the wave crest of higher harmonic current also persistently exists, therefore can repeat last time process again again, causes height
The wave crest of subharmonic current is broken down into many small wave crests, so as to improve the frequency of higher harmonic current.Meanwhile higher hamonic wave
The actual current of electric current can be equal to the average value of all small wave crests after decomposing, so as to reduce the amplitude of higher harmonic current.
In the present embodiment, as shown in Fig. 2, voltage transformation module 20 includes：
Microprocessor U1, the second NMOS tube Q2, transformer T1, first resistor R1, the first rectification filtering module 21 and
Two rectification filtering modules 22；
The first end of the armature winding of transformer T1 is the input terminal of voltage transformation module 20, the armature winding of transformer T1
Second end connect the drain electrode of the second NMOS tube Q2, the control terminal of microprocessor U1 connects the grid of the second NMOS tube Q2,
The first end of the source electrode connection first resistor R1 of second NMOS tube Q2, the ground terminal of microprocessor U1 and the first of first resistor R1
With being connected to the first power supply altogether, the first end of the secondary windings of transformer T1 connects the input terminal of the first rectification filtering module 21 at end,
The first end of the auxiliary winding of transformer T1 connects the input terminal of the second rectification filtering module 22, the secondary windings of transformer T1
The second end of second end and auxiliary winding with being connected to second source altogether, the output terminal of the first rectification filtering module 21 and the second rectification
The output terminal of filter module 22 is the first output terminal and second output terminal of voltage transformation module 20 respectively.
In the present embodiment, microprocessor U1 exports pwm control signal to the second NMOS tube Q2, and the first direct current is in transformation
High-frequency alternating current is converted under the action of the armature winding of device T1 and the second NMOS tube Q2, is passing through armature winding and secondary windings
Between energy transmission, predeterminated voltage alternating current is converted to, finally by the first rectification filtering module 21 and the second rectifying and wave-filtering
Module 22 is converted to predeterminated voltage direct current.
Further, as shown in Fig. 2, the first rectification filtering module 21 can include：
First diode D1, inductance L1 and the first capacitance C1；
The anode of first diode D1 is the input terminal of the first rectification filtering module 21, and the output terminal of the first diode D1 connects
The first end of inductance L1 is connect, the second end of inductance L1 and the first end of the first capacitance C1 connect to form the first rectification filtering module 21 altogether
Output terminal, the second termination second source of the first capacitance C1.
Further, as shown in Fig. 2, the second rectification filtering module 22 can include：
Second resistance R2, the second diode D2 and the second capacitance C2；
The first end of second resistance R2 is the input terminal of the second rectification filtering module 22, and the second end of second resistance R2 connects
The first end of the anode of second diode D2, the cathode of the second diode D2 and the second capacitance C2 connect to form the second rectifying and wave-filtering altogether
The output terminal of module 22, the second end connection second source of the second capacitance C2.
Embodiment 2
The implementation of the present embodiment is established on the basis of embodiment 1.
In the present embodiment, as shown in figure 3, flicker frequency control module 30 further includes voltage control module 33；
The second output terminal of the power end connection voltage transformation module 20 of voltage control module 33, voltage control module 33
Reference voltage end connects the second output terminal of reference voltage module 31, and the test side of voltage control module 33 connects negative output terminal,
The floating voltage test side connection positive output end of voltage control module 33, the signal output part connection voltage of voltage control module 33
The signal input part of modular converter 20.
In the present embodiment, further voltage stabilizing is carried out to the voltage of negative output terminal by adding a voltage control module 33
Processing further reduces the amplitude of the higher harmonic current in the second direct current.Meanwhile voltage control module 33 also passes through detection
The size of floating voltage in the case where floating voltage is excessive, exports larger current signal to microprocessor U1, tells micro- place
It is excessively high to manage device U1 output voltages, reduces duty cycle, reduces output voltage；Floating voltage is so made by continuously negative-feedback
Maintain a stable value.
In the present embodiment, as shown in figure 4, reference voltage module 31 can also include the 8th resistance R8.
8th resistance R8 is serially connected between the 7th resistance R7 and the 9th resistance R9.Specifically, the first end of the 8th resistance R8
The second end of the 7th resistance R7 is connected, the second end of the 8th resistance R8 connects to form reference voltage altogether with the first end of the 9th resistance R9
The output terminal of module 31, the second end of the 7th resistance R7 connect to form reference voltage module 31 altogether with the first end of the 8th resistance R8
Second output terminal.
In the present embodiment, as shown in figure 4, voltage control module 33 can include：
3rd resistor R3, the 4th resistance R4, the 6th resistance R6, the tenth resistance R10, the 11st resistance R11, the 3rd capacitance
C3, the 4th capacitance C4, second operational amplifier U3, voltage-stabiliser tube ZD1 and photoelectrical coupler U4；
The first end of 3rd resistor R3 is the power end of voltage control module 33, the second end of 3rd resistor R3 and the 4th electricity
The first end of resistance R4 is connected to the anode of the light emitting diode of photoelectrical coupler U4, the second end of the 4th resistance R4, photoelectric coupling altogether
The first end of the cathode of the light emitting diode of device U4, the first end of the 4th capacitance C4 and the 6th resistance R6 is connected to the second computing altogether
The output terminal of amplifier U3, the second end of the 6th resistance R6 connect the first end of the 3rd capacitance C3, second operational amplifier U3's
The second end of end of oppisite phase, the second end of the 4th capacitance C4 and the 3rd capacitance C3 is connected to the first end of the tenth resistance R10 altogether, and the tenth
The first end of the second end of resistance R10 and the 11st resistance R11 are connected to the anode of voltage-stabiliser tube ZD1 altogether, and the of the 11st resistance R11
Two ends are the test sides of voltage control module 33, and the cathode of voltage-stabiliser tube ZD1 is the floating voltage test side of voltage control module 33,
The in-phase end of second operational amplifier U3 is the reference voltage end of voltage control module 33, the phototriode of photoelectrical coupler U4
Emitter with connecing the first power supply, the collector of the phototriode of photoelectrical coupler U4 is that the signal of voltage control module 33 is defeated
Outlet.
Specifically, voltage transformation module 20 further includes signal input part SIN, signal input part SIN is voltage transformation module
20 signal input part.Unloaded in LED circuit, positive output end voltage gradually increases the breakdown voltage up to reaching voltage-stabiliser tube ZD1,
Cocurrent enters main control module 32 and is formed into a loop.The end of oppisite phase of second operational amplifier U3 collects unloaded electricity by the tenth resistance R10
Pressure, and compared with the second reference voltage.Second operational amplifier U3 exports low level at this time, and then passes through photoelectrical coupler
U4 exports larger current signal to microprocessor U1, tells that microprocessor U1 output voltages are excessively high, reduces duty cycle, reduces defeated
Go out voltage；So by continuously negative-feedback floating voltage is made to maintain a stable value.
Due to limiting the size of floating voltage, when backlight control circuit band carries, the voltage on positive output end needs
It could enter normal operating conditions less than floating voltage.
In the present embodiment, the voltage of the voltage, i.e. negative output terminal in the drain electrode of the first NMOS tube Q1, is received voltage
In control module 33, the second reference voltage exported with the second output terminal of reference voltage module 31 carries out voltage-contrast.
In the case of profound and negative feedbck, the average value of the voltage of negative output terminal is equal to the second reference voltage.
Embodiment 3
The implementation of the present embodiment is established on the basis of embodiment 1 or 2.
In the present embodiment, the anti-electromagnetism that backlight control circuit is further included before being serially connected with AC-DC conversion module 10 is done
Disturb module.
In the present embodiment, adding electromagnetism interference module can be such that backlight control circuit is not easy by outside electromagnetic interference
Or lightning stroke influences, and enhances the security of backlight control circuit.
The present embodiment is designed to provide a kind of display device, including backlight source module, further includes any of the above-described implementation
Backlight control circuit in example.
Backlight control circuit provided by the present invention is connected with backlight source module, including AC-DC conversion module, voltage
Modular converter and flicker frequency control module；Wherein, city's alternating current is converted to the first direct current by AC-DC conversion module, electricity
The first direct current received is converted to the second direct current and the 3rd direct current of predeterminated voltage by pressure modular converter, and by second
Operating current of the direct current as backlight source module.In addition, flicker frequency control module includes reference voltage module and master control mould
Second direct current and the reference voltage are carried out voltage-contrast by block using main control module, and turned on according to comparing result/
Cut off the current loop of backlight source module, backlight control circuit provided in an embodiment of the present invention design is simple, reduce exploitation into
This, and efficiency is improved, reduce power consumption.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of backlight control circuit, is connected with backlight source module, including AC-DC conversion module and voltage transformation module, institute
It states AC-DC conversion module access city's alternating current and AC-DC conversion is carried out to city's alternating current to export the first direct current, institute
It states voltage transformation module and receives first direct current, and first direct current is converted to the second direct current of predeterminated voltage
With the 3rd direct current, it is characterised in that：
First output terminal of the voltage transformation module is the positive output end of the backlight control circuit, connects the backlight
The anode of module；
The backlight control circuit further includes flicker frequency control module；The power end connection of the flicker frequency control module
The second output terminal of the voltage transformation module, the input terminal of the flicker frequency control module is the backlight control circuit
Negative output terminal, and connect the cathode of the backlight source module；
The flicker frequency control module includes：Power end is the power end of the flicker frequency control module, access described the
The reference voltage module of three direct currents and output reference voltage；And
Reference voltage end connects the output terminal of the reference voltage module, and input terminal is the input of the flicker frequency control module
Second direct current and the reference voltage are carried out voltage-contrast by end, and according to comparing result to the backlight source module
Current loop turn on/cut off the main control module of control.
2. backlight control circuit according to claim 1, which is characterized in that the flicker frequency control module further includes
Voltage control module；
The power end of the voltage control module connects the second output terminal of the voltage transformation module, the voltage control module
Reference voltage end connect the second output terminal of the reference voltage module, described in the test side connection of the voltage control module
Negative output terminal, the floating voltage test side of the voltage control module connect the positive output end, the voltage control module
Signal output part connects the signal input part of the voltage transformation module.
3. backlight control circuit according to claim 1, which is characterized in that the voltage transformation module includes：Micro- place
Manage device, the second NMOS tube, transformer, first resistor, the first rectification filtering module and the second rectification filtering module；
The first end of the armature winding of the transformer is the input terminal of the voltage transformation module, the transformer it is primary around
The second end of group connects the drain electrode of second NMOS tube, and the control terminal of the microprocessor connects the grid of second NMOS tube
Pole, the source electrode of second NMOS tube connect the first end of the first resistor, the ground terminal of the microprocessor and described the
With being connected to the first power supply altogether, the first end of the secondary windings of the transformer connects the first rectification filter to the first end of one resistance
The input terminal of ripple module, the first end of the auxiliary winding of the transformer connect the input terminal of second rectification filtering module,
The second end of the second end of the secondary windings and the auxiliary winding with being connected to second source altogether, the first rectifying and wave-filtering mould
The output terminal of the output terminal of block and second rectification filtering module be respectively the voltage transformation module the first output terminal with
Second output terminal.
4. backlight control circuit according to claim 1, which is characterized in that the main control module includes：First computing
Amplifier, the 12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance and the first NMOS tube；
The in-phase end of first operational amplifier is the reference voltage end of the main control module, first operational amplifier
End of oppisite phase, the first end of the 13rd resistance, the first end of the 14th resistance are connected to the source of first NMOS tube altogether
Pole, the first end of output terminal connection the 15th resistance of first operational amplifier, the second of the 15th resistance
The first end of end and the 12nd resistance is connected to the grid of first NMOS tube altogether, and the drain electrode of first NMOS tube is institute
State the drain electrode of main control module.
5. backlight control circuit according to claim 1, which is characterized in that the reference voltage module includes：5th
Resistance, the 7th resistance, the 9th resistance and controllable accurate source of stable pressure；
The first end of 5th resistance is the power end of the reference voltage module, the second end of the 5th resistance, described
The cathode of the first end of 7th resistance and the controllable accurate source of stable pressure is connected to the controlled end of the controllable accurate source of stable pressure altogether,
The second end of 7th resistance connects the output terminal to form the reference voltage module altogether with the first end of the 9th resistance, institute
State the second end of the anode of controllable accurate source of stable pressure and the 9th resistance with being connected to second source altogether.
6. backlight control circuit according to claim 2, which is characterized in that the voltage control module includes：3rd
Resistance, the 4th resistance, the 6th resistance, the tenth resistance, the 11st resistance, the 3rd capacitance, the 4th capacitance, second operational amplifier,
Voltage-stabiliser tube and photoelectrical coupler；
The first end of the 3rd resistor is the power end of the voltage control module, the second end of the 3rd resistor with it is described
The first end of 4th resistance is connected to the anode of the light emitting diode of the photoelectrical coupler altogether, the second end of the 4th resistance,
The first end of the cathode of the light emitting diode of the photoelectrical coupler, the first end of the 4th capacitance and the 6th resistance
The output terminal of the second operational amplifier is connected to altogether, and the second end of the 6th resistance connects the first of the 3rd capacitance
End, the second end of the end of oppisite phase of the second operational amplifier, the second end of the 4th capacitance and the 3rd capacitance are total to
The first end of the tenth resistance is connected to, the second end of the tenth resistance is connected to institute altogether with the first end of the 11st resistance
The anode of voltage-stabiliser tube is stated, the second end of the 11st resistance is the test side of the voltage control module, the voltage-stabiliser tube
Cathode is the floating voltage test side of the voltage control module, and the in-phase end of the second operational amplifier is the voltage control
The reference voltage end of molding block, the emitter of the phototriode of the photoelectrical coupler with connecing the first power supply, the photoelectricity coupling
The collector of the phototriode of clutch is the signal output part of voltage control module.
7. backlight control circuit according to claim 1, which is characterized in that the backlight control circuit further includes string
The electromagnetism interference module being connected to before AC-DC conversion module.
8. a kind of display device, including backlight source module, which is characterized in that the display device is further included according to claim 1
To 7 any one of them backlight control circuits.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015918.9A CN106658829B (en) | 2016-11-18 | 2016-11-18 | A kind of backlight control circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015918.9A CN106658829B (en) | 2016-11-18 | 2016-11-18 | A kind of backlight control circuit and display device |
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| CN106658829A CN106658829A (en) | 2017-05-10 |
| CN106658829B true CN106658829B (en) | 2018-05-22 |
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| CN105744678A (en) * | 2016-03-11 | 2016-07-06 | 浙江大学 | PWM duty ratio control strategy-based LED driver free of electrolytic capacitor |
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|---|---|---|---|---|
| CN1873747A (en) * | 2005-05-31 | 2006-12-06 | 三星电子株式会社 | Display apparatus with backlight driver control |
| CN1953029A (en) * | 2005-10-20 | 2007-04-25 | 美国凹凸微系有限公司 | Apparatus and method for regulating white lEDs |
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