CN110010085A - A kind of backlight drive adjusts circuit, chip and method - Google Patents
A kind of backlight drive adjusts circuit, chip and method Download PDFInfo
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- CN110010085A CN110010085A CN201910245625.7A CN201910245625A CN110010085A CN 110010085 A CN110010085 A CN 110010085A CN 201910245625 A CN201910245625 A CN 201910245625A CN 110010085 A CN110010085 A CN 110010085A
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- dimming
- backlight
- voltage
- duty ratio
- pulse signal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention discloses a kind of backlight drives to adjust circuit, chip and method, wherein it includes: the backlight control unit for carrying out drive control to backlight module that the backlight drive, which adjusts circuit,；For the sectional dimming voltage setting unit of sectional dimming voltage to be arranged；The dimming control unit of light modulation algorithm control is carried out for exchanging light pulse signal；The segmentation voltage setting unit connects dimming control unit, and the dimming control unit connects backlight control unit.The present invention, which adjusts circuit, chip and method by backlight drive, realizes mixing dimming function, solves the noise problem that single PWM dimming mode has light modulation inductance, it is eliminated again because beat interference causes picture the problem of rolling interference occur, effectively improves the image quality and display effect of TV and other display equipment.
Description
Technical field
The present invention relates to backlight drive control technology field, in particular to a kind of backlight drive adjusts circuit, chip and side
Method.
Background technique
Currently, LED television and other liquid crystal displays, backlight module driving chip mainly uses two kinds of dimming modes,
That is simulation light modulation (analog dimming) mode and PWM(Pulse Width Modulation, pulse width modulation) light modulation
Mode.
For simulating dimming mode, the voltage range of control is typically small, the lamp bar current regulation model for causing it to control
It encloses smaller.With the continuous increase of lamp bar electric current in practical application, backlight module is when simulation light modulation reaches minimum levels, lamp bar
Biggish electric current is still maintained, backlight illumination is still higher, is difficult to meet the gamut control of mould group from bright to dark.Meanwhile such as
Fruit by simulation light modulation level range widen, then appear in backlight module it is darker when lamp bar colour temperature and backlight module brightness compared with
Difference larger situation when high, is unfavorable for the consistency debugging of image quality, therefore fails to popularize in an all-round way in large-sized display devices and answer
With.
And PWM light modulation is then currently widely used a kind of dimming mode, is widely used in LED television field and other are big
Size shows equipment.In mould group brightness control, by adjusting PWM duty cycle, backlight module is by secretly to the full model of bright control
Preferable linear luminance control is able to achieve in enclosing.But PWM light modulation has the following problems:
The light efficiency of first, PWM dimming mode lamp bar is lower；
There is the noise problem of light modulation inductance in second, PWM light modulation, relatively simulate dimming mode, and constant current inductance noise is larger；
Third, the beat interference problem between PWM light modulating frequency and LED glass field frequency can cause picture to occur rolling interference, and
It is difficult to eliminate.
Thus the prior art could be improved and improve.
Summary of the invention
In view of above-mentioned deficiencies of the prior art place, the purpose of the present invention is to provide a kind of backlight drive adjust circuit,
Mixing dimming function may be implemented in chip and method, promotes the image quality and display effect of the display equipment such as TV.
In order to achieve the above object, this invention takes following technical schemes:
A kind of backlight drive adjusting circuit, comprising:
For carrying out the backlight control unit of drive control to backlight module
For the sectional dimming voltage setting unit of sectional dimming voltage to be arranged；
The dimming control unit of light modulation algorithm control is carried out for exchanging light pulse signal；
The sectional dimming voltage setting unit connects dimming control unit, and the dimming control unit connects backlight control list
Member.
The backlight drive is adjusted in circuit, and it further includes partial pressure unit that the backlight drive, which adjusts circuit, the partial pressure
Unit includes first resistor and second resistance, one end input reference voltage of the first resistor, the other end point of first resistor
Not Lian Jie second resistance one end and sectional dimming voltage setting unit.
The backlight drive is adjusted in circuit, and it further includes boost power unit that the backlight drive, which adjusts circuit, described
Boost power unit includes boost inductance, boosting metal-oxide-semiconductor, first diode, output capacitance, 3rd resistor and the 4th resistance, institute
One end input VIN voltage of boost inductance is stated, the other end of boost inductance is separately connected drain electrode and the one or two pole of boosting metal-oxide-semiconductor
The anode of pipe, the cathode of one end connection first diode of output capacitance simultaneously export backlight voltage to backlight module, output capacitance
Other end ground connection, the grid of the metal-oxide-semiconductor that boosts connects backlight control unit, the one of the source electrode connection 3rd resistor for the metal-oxide-semiconductor that boosts
The one end at end and the 4th resistance, the other end ground connection of 3rd resistor, the other end of the 4th resistance connect backlight control unit.
The backlight drive is adjusted in circuit, and it further includes that backlight adjusts unit that the backlight drive, which adjusts circuit, described
It includes light modulation metal-oxide-semiconductor and the 5th resistance that backlight, which adjusts unit, dims the grid connection backlight control unit of metal-oxide-semiconductor, dims metal-oxide-semiconductor
Source electrode connection backlight control unit and the 5th resistance one end, the 5th resistance the other end ground connection, dim metal-oxide-semiconductor drain electrode connect
Connect backlight module.
A kind of backlight drive adjusting chip, it includes chip body that the backlight drive, which adjusts chip, on the chip body
It is integrated to adjust circuit just like backlight drive described in any of the above one.
A kind of backlight drive adjusting method, comprising the following steps:
The value of sectional dimming voltage is set；
It receives the dimmer pulse signal that mainboard is sent and obtains the duty ratio of dimmer pulse signal；
According to the duty ratio of the value of sectional dimming voltage and dimmer pulse signal, the dimming mode of backlight module is selected, is adjusted simultaneously
Drive backlight module.
In the backlight drive adjusting method, the step of setting sectional dimming voltage, is specifically included:
Obtain fixed reference voltage；
Sectional dimming voltage is obtained after dividing to reference voltage, and device array and algorithm control are compared to sectional dimming voltage
Different light modulation sections is obtained after system.
It is described according to the value of sectional dimming voltage and the duty of dimmer pulse signal in the backlight drive adjusting method
Than selecting the dimming mode of backlight module, adjusting and specifically included the step of driving backlight module:
When sectional dimming voltage, which is less than a, to be lied prostrate, if the duty ratio of dimmer pulse signal is less than A%, dimming mode is the light modulation side PWM
Formula；If the duty ratio of dimmer pulse signal is greater than A%, dimming mode is simulation dimming mode；
When sectional dimming voltage, which is greater than a, to be lied prostrate and be less than b volt, if the duty ratio of dimmer pulse signal is less than B%, dimming mode is
PWM dimming mode；If the duty ratio of dimmer pulse signal is greater than B%, dimming mode is simulation dimming mode；
When sectional dimming voltage, which is greater than b, to be lied prostrate and be less than c volt, if the duty ratio of dimmer pulse signal is less than C%, dimming mode is
PWM dimming mode；If the duty ratio of dimmer pulse signal is greater than C%, dimming mode is simulation dimming mode；
When sectional dimming voltage, which is greater than c, to be lied prostrate, if the duty ratio of dimmer pulse signal is less than D%, dimming mode is the light modulation side PWM
Formula；If the duty ratio of dimmer pulse signal is greater than D%, dimming mode is simulation dimming mode；
After the dimming mode for selecting backlight module, adjusts and drive backlight module；
Wherein, 0 < A < B < C < D < 100,0 < a <b < c.
In the backlight drive adjusting method, the dimmer pulse signal for receiving mainboard transmission simultaneously obtains dimmer pulse
The step of duty ratio of signal, specifically includes:
Receive the dimmer pulse signal that mainboard is sent；
It exchanges light pulse signal and carries out the direct current conversion voltage that DC converting obtains the duty ratio of corresponding dimmer pulse signal.
In the backlight drive adjusting method, the light pulse signal progress DC converting of exchanging obtains corresponding light modulation arteries and veins
The step of rushing the direct current conversion voltage of the duty ratio of signal specifically includes:
When the duty ratio of pulse light modulation signal is 100%, corresponding direct current converts voltage as a1；
When the duty ratio of pulse light modulation signal is 50%, corresponding direct current converts voltage as 0.5a1；
When the duty ratio of pulse light modulation signal is D%, corresponding direct current converts voltage as a2；
When the duty ratio of pulse light modulation signal is C%, corresponding direct current converts voltage as a3；
When the duty ratio of pulse light modulation signal is B%, corresponding direct current converts voltage as a4；
When the duty ratio of pulse light modulation signal is A%, corresponding direct current converts voltage as a5；
When the duty ratio of pulse light modulation signal is 0%, corresponding direct current converts voltage as 0；
Wherein, 0 < A < B < C < D < 100,0 < a5 < a4 < a3 < a2 < a1.
Compared to the prior art, a kind of backlight drive provided by the invention adjusts circuit, chip and method, wherein described
It includes: the backlight control unit for carrying out drive control to backlight module that backlight drive, which adjusts circuit,；It is adjusted for segmentation to be arranged
The sectional dimming voltage setting unit of photovoltage；The brightness adjustment control list of light modulation algorithm control is carried out for exchanging light pulse signal
Member；The sectional dimming voltage setting unit connects dimming control unit, and the dimming control unit connects backlight control unit.
The present invention, which adjusts circuit, chip and method by backlight drive, realizes mixing dimming function, solves single PWM dimming mode
It in the presence of the noise problem of light modulation inductance, and eliminates because beat interference causes picture the problem of rolling interference occur, effectively mentions
The image quality and display effect of TV and other display equipment are risen.
Detailed description of the invention
Fig. 1 is the circuit diagram that a kind of backlight drive provided by the invention adjusts circuit.
Fig. 2 is a kind of flow chart of backlight drive adjusting method provided by the invention.
Fig. 3 is the flow chart of step S100 in a kind of backlight drive adjusting method provided by the invention.
Fig. 4 is the flow chart of step S200 in a kind of backlight drive adjusting method provided by the invention.
Fig. 5 is the flow chart of step S220 in a kind of backlight drive adjusting method provided by the invention.
Fig. 6 is the flow chart of step S300 in a kind of backlight drive adjusting method provided by the invention.
Specific embodiment
The present invention provides a kind of backlight drive and adjusts circuit, chip and method, for make the purpose of the present invention, technical solution and
Effect is clearer, clear, and the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should be appreciated that herein
Described specific examples are only used to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, the circuit diagram of circuit is adjusted for backlight drive provided by the invention, while the present invention also provides
A kind of backlight drive adjusting chip, it includes chip body 100 that the backlight drive, which adjusts chip, and the backlight drive adjusts circuit
It is completely or partially integrated on chip body 100, the backlight drive adjusts circuit and includes:
For carrying out the backlight control unit 10 of drive control to backlight module；
For the sectional dimming voltage setting unit 20 of sectional dimming voltage to be arranged；
The dimming control unit 30 of light modulation algorithm control is carried out for exchanging light pulse signal；
The sectional dimming voltage setting unit connects dimming control unit 30, and the dimming control unit 30 connects backlight control
Unit 10, the backlight control unit 10 connect backlight module 40.
Wherein, the backlight drive adjusts chip and is based on backlight current constant control chip core, in original backlight control list
Sectional dimming voltage setting unit 20 and dimming control unit 30, composition simulation light modulation and PWM tune are increased on the basis of member 10
The PWM light-modulating mode of original chip is changed to CPWM(and mixes light modulation function by the settable light modulation chip design scheme of light ratio
Can) light-modulating mode.
CPWM pin is provided on the chip body 100, the dimmer pulse signal that mainboard is sent can pass through definition
CPWM pin is sent into chip body 100.Meanwhile it being additionally provided with ADIM pin and VREF pin on the chip body 100, with
And the periphery of chip body 100 is provided with partial pressure unit 50(and may alternatively be integrated on chip body 100), the partial pressure unit 50
For being sent into ADIM pin after dividing to the reference voltage on VREF pin.
In the particular embodiment, the partial pressure unit 50 includes first resistor R1 and second resistance R2, first resistor R1
One end connect VREF pin, the other end of first resistor R1 is separately connected one end and the ADIM pin of second resistance R2, second
The other end of resistance R2 is grounded.
Wherein, the VREF voltage on VREF pin is that backlight drive adjusts the fixed reference voltage of chip interior, and ADIM draws
ADIM voltage on foot is obtained after partial pressure unit 50 by the VREF voltage inside chip body 100.Sectional dimming voltage
Setting unit 20 includes that the comparator array of multiple comparators formation (compares in the present embodiment including first comparator U1, second
Device U2 and third comparator U3), ADIM voltage (will be defeated after the comparator array inside sectional dimming voltage setting unit 20
The ADIM voltage signal entered is compared with a series of reference voltage) and algorithm control is carried out by dimming control unit 30,
Different light modulation gears, the control threshold of corresponding different external input CPWM signal dutyfactor can be obtained.
In a further embodiment, be additionally provided on the chip body 100 respectively with the back in adjusting control circuit
The DRI pin and ISW pin that light control unit 10 connects, the periphery of chip body 100 is provided with boost boost power unit
Backlight module 40 is made of LED backlight lamp bar in 60, boost boost power units 60 connection backlight module 40(the present embodiment) simultaneously
Backlight voltage is provided for backlight module 40.
Specifically, the boost power unit 60 includes boost inductance L1, boosting metal-oxide-semiconductor Q1, first diode D1, output
Capacitor C2,3rd resistor R3 and the 4th resistance R4, the VIN voltage of one end input mainboard of the boost inductance L1, boost inductance
The other end of L1 is separately connected the drain electrode of boosting metal-oxide-semiconductor Q1 and the anode of first diode D1, and the cathode of first diode D1 connects
One end and the backlight module of output capacitance C2, the other end ground connection of output capacitance C2 are connect, the grid of boosting metal-oxide-semiconductor Q1 connects chip
The DRI pin of ontology 100, one end of the source electrode connection 3rd resistor R3 of boosting metal-oxide-semiconductor Q1 and one end of the 4th resistance R4, third
The other end of resistance R3 is grounded, the end ISW of the other end connection chip body 100 of the 4th resistance R4.
The DRI pin is the driving pin of boosting metal-oxide-semiconductor Q1, and the ISW pin is power loop current detecting pin,
Chip body 100 is made by DRI pin control boosting metal-oxide-semiconductor Q1 on-off to control the work of boost boost power unit 60
The VIN voltage boosting of input is the backlight voltage that backlight module needs.The ISW pin is power loop current detecting pin,
The 3rd resistor R3 and the 4th resistance R4 is current sampling resistor.
Meanwhile ADRI pin and ISEN pin are additionally provided on the chip body 100, the periphery of chip body 100 is also
It is provided with backlight and adjusts unit 70, it includes light modulation metal-oxide-semiconductor Q2 and the 5th resistance R5 that the backlight, which adjusts unit 70,.Dim metal-oxide-semiconductor
The grid of Q2 connects ADRI pin, one end of source electrode connection the ISEN pin and the 5th resistance R5 of light modulation metal-oxide-semiconductor Q2, the 5th resistance
The other end of R5 is grounded, and the drain electrode of light modulation metal-oxide-semiconductor Q2 connects backlight module.
The ADRI pin is the driving pin for dimming metal-oxide-semiconductor Q2, and the ISEN pin is booster circuit power detection electricity
Flow pin.The light modulation metal-oxide-semiconductor Q2 combination dimming control unit 30 forms adjusting control circuit, for adjusting backlight module
The size of electric current；The 5th resistance R5 is current sampling resistor.Certainly, in addition to the periphery of chip body 100 is arranged in, light modulation
Metal-oxide-semiconductor Q2 and the 5th resistance R5 can also be integrated in chip body 100.
Also, LPF pin is additionally provided on the chip body 100, LPF pin is grounded by capacitor C2.The LPF draws
Foot is low-pass filter pin, for carrying out DC converting to the dimmer pulse signal CPWM of input, obtains DC level signal.
Different level values is corresponded under the different duty ratio of CPWM signal, through 30 circuit output of dimming control unit to backlight control circuit
In, the adjusting reference voltage as light modulation metal-oxide-semiconductor Q2.
In addition, the present invention also provides a kind of backlight drive adjusting methods, referring to Fig. 2, being the backlight drive adjusting side
The flow chart of method, the backlight drive adjusting method the following steps are included:
Simultaneously sectional dimming voltage is arranged in S100, selection；
S200, the dimmer pulse signal that mainboard is sent is received；
S300, according to the value of sectional dimming voltage and the duty ratio of dimmer pulse signal, select the dimming mode of backlight module, adjust
It saves and drives backlight module.
Specifically, referring to Fig. 3, the step S100 includes:
S110, fixed reference voltage is obtained；
S120, sectional dimming voltage is obtained after dividing to reference voltage, to sectional dimming voltage be compared device array and
Different light modulation sections is obtained after algorithm control.
The ADIM pin function of chip is adjusted by backlight drive, i.e. ADIM foot voltage passes through internal reference voltage VREF
Through partial pressure unit 50 partial pressure obtain, after the comparator array of segmented dimmer voltage setting unit 20 with dimming control unit 30 into
The control of row algorithm obtains different ADIM voltage settings, corresponds to the control of different external input CPWM signal dutyfactors, thus
The sectional dimming gear of selection setting simulation light modulation and PWM light modulation.
And the sectional dimming gear that backlight drive adjusts chip, which can according to need, to be flexibly configured, such as certain of setting
One light modulation gear A% controls module group backlight using PWM dimming mode when the duty ratio of dimmer pulse signal is 0-A%；It is adjusting
When the duty ratio of light pulse signal is ﹥ A%, dimmed using simulation, to realize mixing dimming function.
Specifically, referring to Fig. 4, the step S200 includes:
S210, the dimmer pulse signal that mainboard is sent is received；
S220, the direct current conversion electricity that light pulse signal progress DC converting obtains the duty ratio of corresponding dimmer pulse signal is exchanged
Pressure.
In brightness adjustment control chip, DC converting can be carried out by dimmer pulse signal CPWM of the LPF pin to input, obtained
To DC level signal.CPWM signal corresponds to different level values under different duty ratios, exports through dimming control unit 30
Adjusting reference voltage into backlight control unit 10, as light modulation metal-oxide-semiconductor Q2.
Specifically, referring to Fig. 5, the step S220 includes:
S221, when the duty ratio of pulse light modulation signal be 100% when, corresponding direct current convert voltage into a1 lie prostrate；
S222, when the duty ratio of pulse light modulation signal be 50% when, corresponding direct current convert voltage into 0.5a1 lie prostrate；
S223, when the duty ratio of pulse light modulation signal be D% when, corresponding direct current convert voltage into a2 lie prostrate；
S224, when the duty ratio of pulse light modulation signal be C% when, corresponding direct current convert voltage into a3 lie prostrate；
S225, when the duty ratio of pulse light modulation signal be B% when, corresponding direct current convert voltage into a4 lie prostrate；
S226, when the duty ratio of pulse light modulation signal be A% when, corresponding direct current convert voltage into a5 lie prostrate；
S227, when the duty ratio of pulse light modulation signal be 0% when, corresponding direct current converts voltage as 0 volt；
Wherein, 0 < A < B < C < D < 100,0 < a5 < a4 < a3 < a2 < a1；The duty ratio of pulse light modulation signal is converted with corresponding direct current
Voltage is linear corresponding relation.
Later, direct current converts voltage VLPFAfter converting using dimming control unit 30, output backlight adjusts unit 70
Adjusting voltage, that is, V of ISENADJ, VADJVoltage value be VLPFVoltage value 1/H, wherein H be preset constant.By by VADJ
It is sent into backlight control unit 10, ISEN passes through VADJIt is adjusted, and then unit 70 is adjusted by backlight and adjusts backlight module 40
Electric current size, it is final to realize control complete machine backlight illumination.
In addition, referring to Fig. 6, the step S300 is specifically included:
S310, when sectional dimming voltage be less than a lie prostrate when, if the duty ratio of dimmer pulse signal be less than A%, dimming mode be PWM tune
Light mode；If the duty ratio of dimmer pulse signal is greater than A%, dimming mode is simulation dimming mode；
S320, when sectional dimming voltage be greater than a lie prostrate and be less than b volt when, if the duty ratio of dimmer pulse signal be less than B%, light modulation side
Formula is PWM dimming mode；If the duty ratio of dimmer pulse signal is greater than B%, dimming mode is simulation dimming mode；
S330, when sectional dimming voltage be greater than b lie prostrate and be less than c volt when, if the duty ratio of dimmer pulse signal be less than C%, light modulation side
Formula is PWM dimming mode；If the duty ratio of dimmer pulse signal is greater than C%, dimming mode is simulation dimming mode；
S340, when sectional dimming voltage be greater than c lie prostrate when, if the duty ratio of dimmer pulse signal be less than D%, dimming mode be PWM tune
Light mode；If the duty ratio of dimmer pulse signal is greater than D%, dimming mode is simulation dimming mode；
S350, select backlight module dimming mode after, adjust and drive backlight module；
Wherein, A < B < C < D, a <b < c.A, B, C, D and a, b, c value can be configured according to actual needs so that backlight
Driving, which adjusts chip, has several light modulation gears.
When the dimmer pulse signal of CPWM pin input is respectively in 100% ~ D%/C%/B%/A%, backlight drive tune
Chip operation is saved in simulation dimming mode.And in the case where simulating dimming mode, the maximum duty cycle of light modulation is 100%.At this point, simulation
It is V that the ISEN of light modulation, which adjusts voltage,ADJ(VLPF/ H).When the input duty cycle of CPWM signal is less than D%/C%/B%/A%, adjust
Light duty ratio reduces since 100% with the reduction of the duty ratio of CPWM signal, and the adjusting voltage of ISEN is dimmed from simulation
Enter PWM light modulation.
Incorporated by reference to Fig. 1, the DIM signal that dimming control unit 30 exports is internal dimming signal, and frequency is fixed as fDIM
(general choose is greater than 20KHz, the noise range that can be identified greater than human ear).When the duty ratio of external CPWM signal is lower than D%
When/C%/B%/A%, which works in a PWM mode, interior with the reduction of external dimmer signal CPWM duty ratio
The duty ratio of portion's dim signal starts to be gradually reduced from 100%, to control the brightness regulation of module group backlight.
Using can reach following effect after backlight drive adjusting method of the invention:
1) the light modulation gamut control for realizing backlight module, avoids the limitation of adjustable range under analog dimming mode；
2) in simulation dimming scope, the light efficiency of backlight module is effectively improved；In PWM dimming scope, guarantee backlight module
The linearity of dimming scope；
3) noise problem that single PWM light modulation has light modulation inductance is solved；
4) eliminating PWM light modulating frequency causes the beat between LED glass field frequency to be interfered, and causes picture rolling interference occur and asks
Topic promotes the image quality and display effect of TV and other display equipment.
Also, using after design scheme provided by the invention, the software of external mainboard is not required to adjust, and scheme compatibility is strong；
External RC circuit is not required to from external pwm signal and switchs to ADIM signal, is directly sent into chip and is handled by CPWM foot,
Reliability is higher.
Therefore, the present invention proposes a kind of under conditions of not changing the light modulating frequency of dimmer pulse signal of mainboard output,
The segmentation mix light modulation that simulation light modulation and PWM light modulation combine is realized by the design of constant current scheme, utilizes what is respectively dimmed
Advantage realizes the light modulation gamut control of LED backlight mould group.Segmented mixing light regulating technology had both improved under PWM dimming mode
The light efficiency of backlight module solves the noise problem that single PWM dimming mode has light modulation inductance, and eliminates PWM light modulation frequency
Rate causes the beat between LED glass field frequency to be interfered, and picture is caused to occur rolling interference problem, to promoting TV and other are aobvious
The image quality and display effect for showing equipment have universal application value.Meanwhile it being improved by applying the technical scheme of the present invention
TV etc. shows the display effect and picture quality of equipment, has important promotional value.
In conclusion the present invention provides a kind of backlight drives to adjust circuit, chip and method, wherein the backlight is driven
The dynamic circuit that adjusts includes: the backlight control unit for carrying out drive control to backlight module；For sectional dimming voltage to be arranged
Sectional dimming voltage setting unit；The dimming control unit of light modulation algorithm control is carried out for exchanging light pulse signal；It is described
Sectional dimming voltage setting unit connects dimming control unit, and the dimming control unit connects backlight control unit.The present invention
Adjusting circuit, chip and method by backlight drive realizes mixing dimming function, solves single PWM dimming mode and there is tune
The noise problem of light inductance, and eliminate because beat interference causes picture the problem of rolling interference occur, effectively improve electricity
Depending on and other display equipment image quality and display effect.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (10)
1. a kind of backlight drive adjusts circuit characterized by comprising
For carrying out the backlight control unit of drive control to backlight module
For the sectional dimming voltage setting unit of sectional dimming voltage to be arranged；
The dimming control unit of light modulation algorithm control is carried out for exchanging light pulse signal；
The sectional dimming voltage setting unit connects dimming control unit, and the dimming control unit connects backlight control list
Member.
2. a kind of backlight drive according to claim 1 adjusts circuit, which is characterized in that the backlight drive adjusts circuit
It further include partial pressure unit, the partial pressure unit includes first resistor and second resistance, and one end of the first resistor inputs reference
Voltage, the other end of first resistor are separately connected one end and the sectional dimming voltage setting unit of second resistance.
3. a kind of backlight drive according to claim 1 adjusts circuit, which is characterized in that the backlight drive adjusts circuit
It further include boost power unit, the boost power unit includes boost inductance, boosting metal-oxide-semiconductor, first diode, output electricity
Hold, 3rd resistor and the 4th resistance, one end input VIN voltage of the boost inductance, the other end of boost inductance are separately connected
Boost the drain electrode of metal-oxide-semiconductor and the anode of first diode, and the cathode of one end connection first diode of output capacitance simultaneously exports back
Photoelectricity is depressed into backlight module, the other end ground connection of output capacitance, and the grid for the metal-oxide-semiconductor that boosts connects backlight control unit, and boost MOS
Pipe source electrode connection 3rd resistor one end and the 4th resistance one end, 3rd resistor the other end ground connection, the 4th resistance it is another
One end connects backlight control unit.
4. a kind of backlight drive according to claim 1 adjusts circuit, which is characterized in that the backlight drive adjusts circuit
It further include that backlight adjusts unit, it includes light modulation metal-oxide-semiconductor and the 5th resistance that the backlight, which adjusts unit, and the grid for dimming metal-oxide-semiconductor connects
Connect backlight control unit, dim metal-oxide-semiconductor source electrode connection backlight control unit and the 5th resistance one end, the 5th resistance it is another
End ground connection dims the drain electrode connection backlight module of metal-oxide-semiconductor.
5. a kind of backlight drive adjusts chip, which is characterized in that it includes chip body that the backlight drive, which adjusts chip, the core
It is integrated on piece ontology and adjusts circuit just like backlight drive described in any one of claim 1-4.
6. a kind of backlight drive adjusting method, which comprises the following steps:
The value of sectional dimming voltage is set；
It receives the dimmer pulse signal that mainboard is sent and obtains the duty ratio of dimmer pulse signal；
According to the duty ratio of the value of sectional dimming voltage and dimmer pulse signal, the dimming mode of backlight module is selected, is adjusted simultaneously
Drive backlight module.
7. a kind of backlight drive adjusting method according to claim 6, which is characterized in that the setting sectional dimming voltage
The step of specifically include:
Obtain fixed reference voltage；
Sectional dimming voltage is obtained after dividing to reference voltage, and device array and algorithm control are compared to sectional dimming voltage
Different light modulation sections is obtained after system.
8. a kind of backlight drive adjusting method according to claim 6, which is characterized in that described according to sectional dimming voltage
Value and dimmer pulse signal duty ratio, the step of selecting the dimming mode of backlight module, adjusting and drive backlight module tool
Body includes:
When sectional dimming voltage, which is less than a, to be lied prostrate, if the duty ratio of dimmer pulse signal is less than A%, dimming mode is the light modulation side PWM
Formula；If the duty ratio of dimmer pulse signal is greater than A%, dimming mode is simulation dimming mode；
When sectional dimming voltage, which is greater than a, to be lied prostrate and be less than b volt, if the duty ratio of dimmer pulse signal is less than B%, dimming mode is
PWM dimming mode；If the duty ratio of dimmer pulse signal is greater than B%, dimming mode is simulation dimming mode；
When sectional dimming voltage, which is greater than b, to be lied prostrate and be less than c volt, if the duty ratio of dimmer pulse signal is less than C%, dimming mode is
PWM dimming mode；If the duty ratio of dimmer pulse signal is greater than C%, dimming mode is simulation dimming mode；
When sectional dimming voltage, which is greater than c, to be lied prostrate, if the duty ratio of dimmer pulse signal is less than D%, dimming mode is the light modulation side PWM
Formula；If the duty ratio of dimmer pulse signal is greater than D%, dimming mode is simulation dimming mode；
After the dimming mode for selecting backlight module, adjusts and drive backlight module；
Wherein, 0 < A < B < C < D < 100,0 < a <b < c.
9. a kind of backlight drive adjusting method according to claim 6, which is characterized in that the tune for receiving mainboard and sending
Light pulse signal and the step of obtaining the duty ratio of dimmer pulse signal specifically includes:
Receive the dimmer pulse signal that mainboard is sent；
It exchanges light pulse signal and carries out the direct current conversion voltage that DC converting obtains the duty ratio of corresponding dimmer pulse signal.
10. a kind of backlight drive adjusting method according to claim 9, which is characterized in that described to exchange light pulse signal
The step of carrying out the direct current conversion voltage for the duty ratio that DC converting obtains corresponding dimmer pulse signal specifically includes:
When the duty ratio of pulse light modulation signal is 100%, corresponding direct current converts voltage as a1；
When the duty ratio of pulse light modulation signal is 50%, corresponding direct current converts voltage as 0.5a1；
When the duty ratio of pulse light modulation signal is D%, corresponding direct current converts voltage as a2；
When the duty ratio of pulse light modulation signal is C%, corresponding direct current converts voltage as a3；
When the duty ratio of pulse light modulation signal is B%, corresponding direct current converts voltage as a4；
When the duty ratio of pulse light modulation signal is A%, corresponding direct current converts voltage as a5；
When the duty ratio of pulse light modulation signal is 0%, corresponding direct current converts voltage as 0；
Wherein, 0 < A < B < C < D < 100,0 < a5 < a4 < a3 < a2 < a1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110910820A (en) * | 2019-12-20 | 2020-03-24 | 京东方科技集团股份有限公司 | Display driving method and device and display system |
| CN114743520A (en) * | 2022-05-23 | 2022-07-12 | 深圳创维－Rgb电子有限公司 | Mini-LED self-adaptive dimming method, device, equipment and medium |
| WO2023087134A1 (en) * | 2021-11-16 | 2023-05-25 | 瑞仪光电(苏州)有限公司 | Display apparatus and correction method therefor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769695A (en) * | 2011-05-02 | 2012-11-07 | Lg电子株式会社 | Mobile terminal and control method thereof |
| CN203788378U (en) * | 2013-11-28 | 2014-08-20 | 深圳Tcl新技术有限公司 | LED hybrid light modulation circuit and television set |
| CN104766567A (en) * | 2015-03-18 | 2015-07-08 | 康佳集团股份有限公司 | LED backlight driving circuit and brightness regulating method of LED backlight |
| US20150280567A1 (en) * | 2014-04-01 | 2015-10-01 | Rohm Co., Ltd. | Switching regulator |
| CN204836722U (en) * | 2015-08-18 | 2015-12-02 | 深圳市正远科技有限公司 | LED drive power supply segmentation dimmer circuit |
-
2019
- 2019-03-28 CN CN201910245625.7A patent/CN110010085B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769695A (en) * | 2011-05-02 | 2012-11-07 | Lg电子株式会社 | Mobile terminal and control method thereof |
| CN203788378U (en) * | 2013-11-28 | 2014-08-20 | 深圳Tcl新技术有限公司 | LED hybrid light modulation circuit and television set |
| US20150280567A1 (en) * | 2014-04-01 | 2015-10-01 | Rohm Co., Ltd. | Switching regulator |
| CN104766567A (en) * | 2015-03-18 | 2015-07-08 | 康佳集团股份有限公司 | LED backlight driving circuit and brightness regulating method of LED backlight |
| CN204836722U (en) * | 2015-08-18 | 2015-12-02 | 深圳市正远科技有限公司 | LED drive power supply segmentation dimmer circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110910820A (en) * | 2019-12-20 | 2020-03-24 | 京东方科技集团股份有限公司 | Display driving method and device and display system |
| WO2023087134A1 (en) * | 2021-11-16 | 2023-05-25 | 瑞仪光电(苏州)有限公司 | Display apparatus and correction method therefor |
| CN114743520A (en) * | 2022-05-23 | 2022-07-12 | 深圳创维－Rgb电子有限公司 | Mini-LED self-adaptive dimming method, device, equipment and medium |
| CN114743520B (en) * | 2022-05-23 | 2024-03-08 | 深圳创维－Rgb电子有限公司 | Mini-LED self-adaptive dimming method, device, equipment and medium |
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