CN106211495A - Control device and method capable of improving panel dimming efficiency - Google Patents
Control device and method capable of improving panel dimming efficiency Download PDFInfo
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- CN106211495A CN106211495A CN201510256282.6A CN201510256282A CN106211495A CN 106211495 A CN106211495 A CN 106211495A CN 201510256282 A CN201510256282 A CN 201510256282A CN 106211495 A CN106211495 A CN 106211495A
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Abstract
The invention relates to a control device and a method capable of improving the dimming efficiency of a panel, which comprises a dimming controller, a booster circuit, a comparison circuit and a light emitting array module, wherein the booster circuit is connected with the light emitting array module; the signal output end of the light adjusting controller is respectively connected with the booster circuit and the comparison circuit, the booster circuit is respectively connected with the comparison circuit and the signal input end and the signal output end of the light emitting array module, the light adjusting controller drives the light emitting array module to emit light through the booster circuit, and when the comparison circuit executes an optimized comparison mechanism according to a reference signal and an output voltage of the booster circuit, the output voltage generated by the booster circuit is adjusted to be a starting voltage with stability, noise generated when the voltage is unstable is eliminated, and the purpose of improving the working efficiency of the control device is achieved.
Description
Technical field
The present invention relates to a kind of control device, particularly relates to a kind of control dress promoting panel light modulation usefulness
Put and method.
Background technology
The most general Thin Film Transistor-LCD (Thin film transistor liquid
Crystal display, TFT-LCD), often it is used on TV, flat-panel screens and scialyscope, on
Stating display and be generally of one for adjusting the light adjusting and controlling device of brightness, this light adjusting and controlling device is through various
Different dimming control techniques adjusts the brightness of panel, such as: pulse width modulation (PWM) pattern or
Phase-shifted (phase shift) pattern, is based on switching the switching condition of ON/OFF to adjust panel
Brightness.
Refer to shown in Fig. 4, be light adjusting and controlling device known to one, it include a light adjusting controller 91,
One drive circuit and a LED array module 92, this drive circuit includes current source controller 93 and an electricity
Pressure converter 94, this light adjusting controller 91 is to be connected with this current source controller 93, this LED array mould
The input of block 92, outfan are connected with this electric pressure converter 94, this current source controller 93 respectively,
To constitute a LED current source feedback；Wherein, this light adjusting controller 91 receive a PWM working signal,
This electric pressure converter 94 is made to produce an output voltage luminous, such as Fig. 5 to control this LED array module 92
Shown in, wherein have one and represent the trunnion axis of time, vertical axis and this output voltage representing magnitude of voltage
Waveform S, the dutycycle (duty obtained by the working time t of this output voltage is divided by cycle time T
Ratio), time on the low side, the switching time of this electric pressure converter 94 diminishes the most relatively, particularly defeated at this
Go out voltage in switching and between not switching when, easily cause the exchange ripple R (AC of this output voltage
Ripple) excessive, therefore this output voltage can produce abnormal sound problem when an electric capacity of voltage regulation or a charging inductance
(acoustic noise)。
By the output voltage of this electric pressure converter 94, feed back via a dividing potential drop and improve this output voltage, though
The problem that so can reduce abnormal sound, but above-mentioned solution can allow this light adjusting and controlling device that one low-key is occurring
During light dutycycle (low dimming duty), this electric pressure converter 94 is made to boost and produce too high height
Voltage, really produces the problem that effective percentage is the best, therefore, receives when this light adjusting and controlling device in prior art
The dutycycle of PWM working signal on the low side time, caused output voltage and input current have bigger ripple,
The problem producing abnormal sound, needs to be proposed the necessity of more preferably solution really.
Summary of the invention
It is an object of the invention to provide a kind of control device and method promoting panel light modulation usefulness, it passes through
Detect the electricity condition of using of a light emitting module, and design has adaptive Power convert framework, to provide enough
The output voltage of this light emitting module work, and produced output voltage is kept stable and energy-conservation state,
The noise produced to eliminate voltage instability, and promote task performance.
The technical scheme is that and provide a kind of control method promoting panel light modulation usefulness, this can promote
The control method of panel light modulation usefulness is to be connected a booster circuit and a comparison circuit by a light adjusting controller, should
Booster circuit is connected with this comparison circuit again, and described method comprises the following steps:
Received a PWM working signal by this light adjusting controller, and provided an output voltage by this booster circuit；
When this PWM working signal meets one pre-conditioned, and this comparison circuit obtains a reference signal, by this
Comparison circuit, according to this reference signal and this output voltage, performs an optimized comparison mechanism；
Output has a cut-in voltage of stability, to adjust the brightness of a luminous array module.
Through said method, when this light adjusting controller receives this PWM working signal, and carried by this booster circuit
For output voltage, when judge this PWM working signal whether meet this pre-conditioned time, this is pre-conditioned be with
One PWM duty cycle is relevant, especially produces noise when this PWM duty cycle is on the low side because of voltage instability, therefore works as
This pre-conditioned for this PWM duty cycle less than preset a threshold value time, this comparison circuit detect this reference
Signal, this comparison circuit then performs this according to this reference signal and optimized compares machine with this output voltage
Make, and output has this cut-in voltage of stability to this luminous array module, to eliminate voltage instability time institute
The noise produced, reaches to promote the purpose of task performance.
The present invention also provides for a kind of control device promoting panel light modulation usefulness, and this can promote panel light modulation effect
The control device of energy includes:
One light adjusting controller, is to have at least one signal input part and multiple signal output part, this brightness adjustment control
The signal input part of device is to receive a PWM working signal；
One booster circuit, it includes a boost converter, is to be connected with this light adjusting controller；
One luminous array module, is that the boost converter with this booster circuit is connected；
One comparison circuit, it includes a voltage selector and a voltage comparator, and this voltage selector is respectively
Being connected with this light adjusting controller, the boost converter of this booster circuit and this voltage comparator, this voltage ratio is relatively
Device is to be connected with this boost converter；
Wherein, this light adjusting controller receive this PWM working signal, and by the boost conversion of this booster circuit
Device provides an output voltage to accord with to this luminous array module, the PWM working signal received when this light adjusting controller
Unify pre-conditioned, and the voltage selector of this comparison circuit obtains a reference signal, then by this comparison circuit
Voltage comparator according to this reference signal and this output voltage, perform an optimized comparison mechanism, with will
This output voltage is adjusted to a cut-in voltage of tool stability, and exports this cut-in voltage to this light emitting array
Module is to adjust its brightness.
From above-mentioned structure, the present invention can promote the control device of panel light modulation usefulness and be mainly by this light modulation
Controller connects this booster circuit and this comparison circuit, and this booster circuit connects this comparison circuit the most respectively and is somebody's turn to do
Luminous array module, by the reception PWM working signal that this light adjusting controller is lasting, and by this booster circuit
Boost converter provide output voltage to this luminous array module, to drive this luminous array module luminous,
The PWM working signal received when this light adjusting controller meets one pre-conditioned, and this pre-conditioned is and one
PWM duty cycle is relevant, especially when this PWM duty cycle is on the low side, can produce noise because of voltage instability,
Therefore when this pre-conditioned for this PWM duty cycle less than preset a threshold value time, the voltage of this comparison circuit
Selector is detection one reference signal, then and is somebody's turn to do according to this reference signal by the voltage comparator of this comparison circuit
Output voltage, performs this optimized comparison mechanism and this output voltage is adjusted to the unlatching electricity of tool stability
Pressure, is adjusted the brightness of this luminous array module, and is eliminated produced noise during voltage instability, reached
Promote the purpose that the present invention controls the task performance of device.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as to the present invention's
Limit.
Accompanying drawing explanation
Fig. 1 is the architecture block diagram of a preferred embodiment of the present invention；
Fig. 2 is the circuit diagram of a preferred embodiment of the present invention；
Fig. 3 is the control method flow chart of a preferred embodiment of the present invention；
Fig. 4 is a known light adjusting and controlling device；
Fig. 5 is the oscillogram of a known light adjusting and controlling device output AC ripple.
Detailed description of the invention
With the following drawings and preferred embodiments of the present invention, the present invention is expanded on further for reaching predetermined sending out
The technological means taked of improving eyesight.
The preferred embodiment controlling device of panel light modulation usefulness can be promoted about the present invention, refer to Fig. 1
Shown in, it includes light adjusting controller 10, booster circuit 20, comparison circuit 30 and a light emitting array
Module 40, this light adjusting controller 10 is to be connected with this booster circuit 20 and this comparison circuit 30, this boosting
Circuit 20 is connected with this comparison circuit 30 and this luminous array module 40 the most respectively, by this brightness adjustment control
The reception one PWM working signal that device 10 is lasting, and provided an output voltage Vo by this booster circuit 20
To this luminous array module 40, to drive this luminous array module 40 luminous.
This light adjusting controller 10 is to have at least one signal input part and multiple signal output part, and through being somebody's turn to do
The signal input part of light adjusting controller 10 receives this PWM working signal；This booster circuit 20 mainly by
One current source controller 21, boost converter 22 and a voltage protection circuit 23 form, this current source
Controller 21 is to be connected with this light adjusting controller 10, this boost converter 22 respectively, this boost converter
22 is to be connected with this voltage protection circuit 23；This comparison circuit 30 mainly by a voltage selector 31 and
One voltage comparator 32 forms, this voltage selector 31 be respectively with this light adjusting controller 10, this boosting
Boost converter 22 and this voltage comparator 32 of circuit 20 connect, this voltage comparator 32 be respectively with
The voltage protection circuit 23 of this booster circuit 20, boost converter 22 connect.
Above-mentioned luminous array module 40 be respectively with boost converter 22, this liter of this booster circuit 20
Voltage protection circuit 23 and this current source controller 21 of volt circuit 20 connect, and when this light modulation control
Device 10 processed continues to this PWM working signal, and is provided this output voltage by this boost converter 22
Vo is to this luminous array module 40.If it is pre-that the PWM working signal that this light adjusting controller 10 receives meets one
If condition, this is pre-conditioned in the present embodiment is a PWM duty cycle (such as: a percentage ratio), especially
It is when the PWM duty cycle received is on the low side, can produce noise because of voltage instability, therefore preset when this
Condition is this PWM duty cycle when being less than a default threshold value (unit is a percentage ratio), and this compares
The voltage selector 31 of circuit 30 is the reference voltage REF exported by this boost converter 22 to be detected,
And this reference voltage REF to be converted to a reference signal, then by the voltage comparator 32 of this comparison circuit 30
According to this reference signal and this output voltage Vo, perform an optimized comparison mechanism, with by this output electricity
Pressure Vo is adjusted to a cut-in voltage of tool stability, and exports this cut-in voltage to this luminous array module
40 to adjust its brightness.
For the concrete application mode of present pre-ferred embodiments is described, refer to shown in Fig. 2, wherein this liter
The current source controller 21 of volt circuit 20 is to have multiple current source, and this luminous array module 40 is to have
The luminescence unit string 41 of many groups, such luminescence unit string 41 is to be concatenated by multiple light emitting diodes (LED)
Composition, an input of such luminescence unit string 41 is to be connected with this output voltage Vo, this luminescence unit
Another input of string 41 is to be connected with this current source.When this boost converter 22 operates in boost mode,
Feedback can be constituted by the luminescence unit string 41 of many groups with multiple current sources, and select such luminescence unit string
Voltage signal minimum in 41 compares, and uses and allows the output voltage Vo of this boost converter 22 reach
Cut-in voltage required for this luminous array module 40.
It addition, for adapt to various application, it is necessary to adjust various brightness through this light adjusting controller 10,
This light adjusting controller 10 is opened in order to the LED current size and LED setting this luminous array module 40
PWM duty cycle (such as PWM duty cycle), and produce enough output by this boost converter 22
Voltage Vo, to meet the current settings required for this luminous array module 40, further, this liter of piezoelectricity
The voltage protection circuit 23 on road 20 has an overvoltage protection (Over Voltage Protection, OVP)
Mechanism, main purpose is intended to protection circuit element and will not be damaged by too high voltage, if what LED opened
PWM duty cycle is under working cycle situation on the low side, and this boost converter 22 can be because opening
Time is short, the shut-in time is long, and the ripple producing input current and output voltage Vo becomes big situation and makes
Become abnormal sound, but by the overvoltage protection mechanism of aforesaid voltage protection circuit 23, allow this boost converter
22 produce output voltage Vo, to avoid the ripple of input current and output voltage Vo to become big, although produce
Output voltage Vo bigger with the voltage phase difference opened required for LED time, power consumption (power can be caused
Consumption) increase on, in the preferred embodiment, switches at this booster circuit 20
Before overvoltage protection mechanism, first can be detected an optimized ginseng by the voltage selector 31 of this comparison circuit 30
Examine voltage, and this reference voltage REF is converted to a reference signal, when PWM duty cycle is on the low side,
By output voltage Vo compared with this reference signal, and export one stable and enough open LED's
Voltage, owing to now this booster circuit 20 is stably to produce cycle switch action without there being aforementioned shakiness
The situation of fixed switch, therefore, it is possible to eliminate abnormal sound, raising efficiency.
By concrete application mode and the explanation of the preferred embodiment of the invention described above, can summarize one can carry
Rise the control method of panel light modulation usefulness, mainly by aforementioned light adjusting controller 10 and this booster circuit 20
And this comparison circuit 30 connects, this booster circuit 20 is connected with this comparison circuit 30 again, as it is shown on figure 3,
The method comprises the following steps:
Received a PWM working signal by this light adjusting controller 10, and provided one defeated by this booster circuit 20
Go out voltage (S31)；
When this PWM working signal meets one pre-conditioned, and this comparison circuit 30 obtains one through detection
Reference signal, by this comparison circuit 30 according to this reference signal and this output voltage, performs one optimized
Comparison mechanism (S32)；In the present embodiment, this comparison mechanism is further first to obtain this booster circuit 20
The output voltage exported and an overvoltage protection (OVP) voltage of this voltage protection circuit 23,
And M decile will be divided between this output voltage (such as 15V) and this overvoltage protection voltage (such as 10V),
And it is greater than the N decile that subtracts 1 less than N decile then this output is electric according to the voltage opening at present LED
Pressure is adjusted to the output voltage after another adjustment being applicable to N decile；
A cut-in voltage with stability is exported, to adjust this luminescence according to the output voltage after this adjustment
The brightness (S33) of array module 40.
In sum, the present invention is primarily directed to when a low dimming duty cycle (low dimming duty),
Switch mode switches to stable overvoltage protection mechanism from luminescence unit string 41 feedback of many groups and carries out one
After optimized comparison mechanism, it is locked in the voltage being slightly above normal luminous unit string 41, so that
The problem that the exchange ripple of output voltage is excessive is solved, except solving abnormal sound problem, additionally it is possible to reduce
Power consumption, and reach the purpose of raising efficiency.
The above is only presently preferred embodiments of the present invention, is not the present invention any pro forma
Limit, although the present invention is open as above with preferred embodiment, but is not limited to the present invention, any
Those skilled in the art, in the range of without departing from technical solution of the present invention, when available disclosed above
Technology contents is made a little change or is revised as the Equivalent embodiments of equivalent variations, as long as being without departing from the present invention
The content of technical scheme, any simple modification above example made according to the technical spirit of the present invention,
Equivalent variations and amendment, all still fall within the range of technical solution of the present invention.
Claims (10)
1. the control method that can promote panel light modulation usefulness, it is characterised in that described method is used for controlling
One light adjusting controller, a booster circuit and a comparison circuit, this light adjusting controller connects this booster circuit and is somebody's turn to do
Light adjusting controller connects a booster circuit and comparison circuit, comparison circuit, and this booster circuit compares again electric with this
Road connects, and described method comprises the following steps:
Received a pulse width modulation working signal by this light adjusting controller, and provided one defeated by this booster circuit
Go out voltage；
When this pulse width modulation working signal meets one pre-conditioned, and this comparison circuit obtains one with reference to letter
Number, and by this comparison circuit according to this reference signal and this output voltage, perform an optimized comparison mechanism；
This booster circuit exports a unlatching electricity with stability according to the result of this optimized comparison mechanism
Pressure, to adjust the brightness of a luminous array module.
The control method promoting panel light modulation usefulness the most according to claim 1, it is characterised in that
This is pre-conditioned is that the dutycycle of this pulse width modulation working signal is less than the threshold value preset；This compares
Mechanism is to obtain the output voltage of this booster circuit and an overvoltage protection voltage, and by this output voltage with
M decile it is divided between this overvoltage protection voltage, and according to a current cut-in voltage more than the N decile that subtracts 1
And less than N decile, then this output voltage is adjusted to another output voltage being applicable to N decile.
3. the control device that can promote panel light modulation usefulness, it is characterised in that the described panel that promotes is adjusted
The control device of light transmittance efficiency includes:
One light adjusting controller, has at least one signal input part and multiple signal output part, this light adjusting controller
Signal input part in order to receive a pulse width modulation working signal；
One booster circuit, it includes a boost converter, is connected with this light adjusting controller；
One luminous array module, is connected with the boost converter of this booster circuit；
One comparison circuit, it includes a voltage selector and a voltage comparator, this voltage selector respectively with
This light adjusting controller, the boost converter of this booster circuit and this voltage comparator connect, this voltage comparator
It is connected with this boost converter；
Wherein, this light adjusting controller receive this pulse width modulation working signal, and by this booster circuit
Boost converter provide an output voltage to this luminous array module, when the pulse width that this light adjusting controller receives
Degree modulation working signal meets one pre-conditioned, and the voltage selector of this comparison circuit obtains one with reference to letter
Number, then by the voltage comparator of this comparison circuit according to this reference signal and this output voltage, perform one optimal
The comparison mechanism changed, to be adjusted to a cut-in voltage of tool stability, and by this unlatching electricity by this output voltage
Pressure exports to this luminous array module to adjust its brightness.
The control device promoting panel light modulation usefulness the most according to claim 3, it is characterised in that
This booster circuit farther includes a current source controller, this current source controller be respectively with this brightness adjustment control
Device, this boost converter connect；This luminous array module is to be connected with this current source controller further.
The control device promoting panel light modulation usefulness the most according to claim 3, it is characterised in that
This booster circuit farther includes a voltage protection circuit, and this voltage protection circuit is the liter with this booster circuit
Pressure converter connects；The voltage comparator of this comparison circuit is electric with the voltage protection of this booster circuit further
Road connects；This luminous array module is that the voltage protection circuit with this booster circuit is connected.
The control device promoting panel light modulation usefulness the most according to claim 4, it is characterised in that
This booster circuit farther includes a voltage protection circuit, and this voltage protection circuit is the liter with this booster circuit
Pressure converter connects；The voltage comparator of this comparison circuit is electric with the voltage protection of this booster circuit further
Road connects；This luminous array module is that the voltage protection circuit with this booster circuit is connected.
7. dim the control device of usefulness according to the promoted panel described in claim 4 or 6, its feature exists
In, the current source controller of this booster circuit is to have multiple current source, this luminous array module be have many
The luminescence unit string of group, the input of this luminescence unit string is to be connected with this output voltage, this luminescence unit string
Outfan be to be connected with this current source.
The control device promoting panel light modulation usefulness the most according to claim 7, it is characterised in that
This luminescence unit string comprises the light emitting diode of multiple concatenation.
9. the control dress of usefulness is dimmed according to the promoted panel described in any one in claim 3 to 6
Put, it is characterised in that this luminous array module has the luminescence unit string of many groups, this luminescence unit string defeated
Entering end is to be connected with this output voltage, and the outfan of this luminescence unit string is the boost conversion with this booster circuit
Device connects.
The control device promoting panel light modulation usefulness the most according to claim 9, it is characterised in that
This luminescence unit string comprises the light emitting diode of multiple concatenation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104114543 | 2015-05-07 | ||
| TW104114543A TW201640955A (en) | 2015-05-07 | 2015-05-07 | Control device capable and method capable of improving panel dimming performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106211495A true CN106211495A (en) | 2016-12-07 |
Family
ID=57460259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510256282.6A Pending CN106211495A (en) | 2015-05-07 | 2015-05-19 | Control device and method capable of improving panel dimming efficiency |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106211495A (en) |
| TW (1) | TW201640955A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109219184A (en) * | 2017-07-04 | 2019-01-15 | 安钛医疗设备股份有限公司 | Light emitting diode driving circuit and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120098441A1 (en) * | 2010-10-26 | 2012-04-26 | Mstar Semiconductor, Inc. | LED Driving System and Driving Method Thereof |
| TW201228477A (en) * | 2010-12-31 | 2012-07-01 | Hon Hai Prec Ind Co Ltd | Light emitting diode driving circuit |
| CN102932985A (en) * | 2011-08-12 | 2013-02-13 | 瑞鼎科技股份有限公司 | Light emitting diode driving device |
| CN102984860A (en) * | 2012-11-21 | 2013-03-20 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) dimming drive module, backlight module and liquid crystal display device |
-
2015
- 2015-05-07 TW TW104114543A patent/TW201640955A/en unknown
- 2015-05-19 CN CN201510256282.6A patent/CN106211495A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120098441A1 (en) * | 2010-10-26 | 2012-04-26 | Mstar Semiconductor, Inc. | LED Driving System and Driving Method Thereof |
| TW201228477A (en) * | 2010-12-31 | 2012-07-01 | Hon Hai Prec Ind Co Ltd | Light emitting diode driving circuit |
| CN102932985A (en) * | 2011-08-12 | 2013-02-13 | 瑞鼎科技股份有限公司 | Light emitting diode driving device |
| CN102984860A (en) * | 2012-11-21 | 2013-03-20 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) dimming drive module, backlight module and liquid crystal display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109219184A (en) * | 2017-07-04 | 2019-01-15 | 安钛医疗设备股份有限公司 | Light emitting diode driving circuit and method |
| CN109219184B (en) * | 2017-07-04 | 2020-08-04 | 安钛医疗设备股份有限公司 | Light emitting diode driving circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201640955A (en) | 2016-11-16 |
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Application publication date: 20161207 |