CN103781245B - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN103781245B CN103781245B CN201410003733.0A CN201410003733A CN103781245B CN 103781245 B CN103781245 B CN 103781245B CN 201410003733 A CN201410003733 A CN 201410003733A CN 103781245 B CN103781245 B CN 103781245B
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Abstract
A kind of backlight module comprises transducer, light-emitting diode group, microcontroller, resistance modulation module, and booster circuit.This light-emitting diode group is coupled to this transducer, in order to provide backlight.This microcontroller is coupled to this transducer, in order to produce pulse width modulation signal to this transducer according to input signal.This resistance modulation module is coupled to this transducer and this microcontroller, exports corresponding resistance in order to the working cycle according to this pulse width modulation signal.This booster circuit comprises the first switch, and is coupled to this transducer and this light-emitting diode group, and in order to this light-emitting diode group to provide input voltage, wherein this first switch opens according to operation signal corresponding to this resistance and this pulse width modulation signal and cuts out.
Description
Technical field
The present invention is about a kind of backlight module, and espespecially one utilizes pulse width modulation signal to control backlight
Strong and weak backlight module.
Background technology
Light emitting diode is because its characteristic saving electric power and high brightness becomes common backlight module luminescence unit
Part, and the type of drive of general control light-emitting diode luminance has two kinds, analogy light modulation (Analog dimming)
And digital dimming (Digital diming).Analogy light modulation flows through the size of current of light emitting diode by control,
Adjusting the brightness of light emitting diode, digital dimming is then by the modulation of pulse signal width, increase and decrease luminescence
The time of diode current flow, to reach the purpose adjusting light and shade.Due to digital dimming conducting voltage electric current relatively
It is fixing, so the problem of color offset will not occur when low-light level, the most therefore becomes a kind of welcome
Light-modulating mode.
More and more higher for the quality requirements of display however as user, the bright dark contrast degree of picture is also
Becoming an important indicator of display quality, therefore display is requested to maximum brightness was accomplished ratio in the past
Brighter, minimum brightness then to be accomplished more darker than in the past, to reach bigger contrast.For utilizing pulse signal
For width modulation adjusts the display of light-emitting diode luminance, when operation is in brightness on the low side, pulse is interrogated
Number working cycle (Duty cycle) the most relatively small, and pulse signal less working cycle it would be possible to
The driving voltage causing light emitting diode is unstable, even causes the situation that screen flicker is unstable.The most such as
What utilizes pulse signal width modulation to operate under the situation of low-light level, and light emitting diode can be made to remain stable
Luminescence, becomes a challenge.
Summary of the invention
For overcoming above-mentioned technical problem, the present invention provides a kind of backlight module, to be in brightness on the low side in backlight
In the case of, improve operation signal frequency, with the output voltage of stable maintenance booster circuit, and solve in
Low-light level screen is easily generated the problem that flicker is unstable.
The invention provides a kind of backlight module, its comprise transducer, light-emitting diode group, microcontroller,
Resistance modulation module and booster circuit；Light-emitting diode group is coupled to this transducer, in order to provide backlight；Micro-
Controller is coupled to this transducer, in order to produce pulse width modulation signal to this transducer according to input signal；
Resistance modulation module is coupled to this transducer and this microcontroller, in order to according to this pulse width modulation signal
The resistance that working cycle output is corresponding；Booster circuit is coupled to this transducer and this light-emitting diode group, in order to
By the first dc voltage boost to the second DC voltage, this light-emitting diode group to be provided this second unidirectional current
Pressure, this booster circuit comprises the first switch, and this first switch is according to operation signal corresponding to this resistance and this arteries and veins
Rush width modulation signal to open and close.
It is also preferred that the left in described backlight module, this resistance modulation module comprises the first resistance, the second electricity
Resistance and second switch；Second resistor coupled in parallel is in this first resistance；Second switch be series at this second resistance and
It is coupled to this microcontroller；Wherein when this working cycle of this pulse width modulation signal is less than predetermined value
Time, this microcontroller turns on this second switch of this resistance modulation module.
It is also preferred that the left in described backlight module, be more than when this working cycle of this pulse width modulation signal
Or during equal to this predetermined value, this microcontroller ends this second switch of this resistance modulation module.
It is also preferred that the left in described backlight module, this second switch of this resistance modulation module be transistor or
Electronic switch.
It is also preferred that the left in described backlight module, this resistance modulation module comprises variable resistance.
Present invention also offers the control method of a kind of backlight module, it comprises the steps of according to input news
Number produce pulse width modulation signal；Working cycle according to this pulse width modulation signal adjusts resistance modulation
The resistance of module；Operation signal is produced according to this resistance；And according to this operation signal and this pulse width modulation
The first of signal control booster circuit switches on and closes, to control to be coupled to the luminescence of this booster circuit
Diode group produces backlight.
It is also preferred that the left in the control method of described backlight module, being somebody's turn to do according to this pulse width modulation signal
Working cycle adjusts this resistance step and comprises, when this working cycle of this pulse width modulation signal is less than predetermined
During value, downgrade this resistance, to promote the frequency of this operation signal.
It is also preferred that the left in the control method of described backlight module, this resistance modulation module comprise the first resistance,
Second resistance and second switch, this first resistance and this second resistor coupled in parallel, this second switch and this second electricity
Resistance series connection, this resistance is determined with this second resistance by this first resistance, and this downgrades this resistance step and comprise, leads
This second switch of this resistance modulation module logical.
It is also preferred that the left in the control method of described backlight module, being somebody's turn to do according to this pulse width modulation signal
Working cycle adjusts this resistance step and comprises, when this pulse width modulation signal this working cycle more than or etc.
When predetermined value, increase this resistance, to reduce the frequency of this operation signal.
It is also preferred that the left in the control method of described backlight module, this resistance modulation module comprise the first resistance,
Second resistance and second switch, this first resistance and this second resistor coupled in parallel, this switch and this second resistance string
Connection, this resistance is determined with this second resistance by this first resistance, and this increases this resistance step and comprises, and cut-off should
This second switch of resistance modulation module.
It is also preferred that the left in the control method of described backlight module, according to this operation signal and this pulse width
Modulation signal control this first switch on and close according to this operation signal and this pulse width modulation news
Number logic product (Logical product) control this and first switch on and close.
Compared with prior art, backlight module of the present invention can in the case of backlight is in brightness on the low side, by
Change the resistance of resistance modulation module, improve the frequency of operation signal, defeated with stable maintenance booster circuit
Go out voltage, and solve the problem that prior art be set forth in low-light level screen is easily generated flicker shakiness.Work as the back of the body simultaneously
In the case of light is in normal brightness, backlight module of the present invention also can reduce the frequency of operation signal, to promote
The efficiency of booster circuit.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the backlight module of one embodiment of the invention；
Fig. 2 is the associative operation signal figure of Fig. 1 backlight module；
Fig. 3 is the schematic diagram of the backlight module of another embodiment of the present invention；
Fig. 4 is the flow chart of the control method of the backlight module of Fig. 1 and Fig. 3.
Detailed description of the invention
For making the purpose of the present invention, structure, feature and function thereof are had further understanding, hereby coordinate reality
Execute example and describe in detail as follows.
Refer to the schematic diagram of the backlight module that Fig. 1, Fig. 1 are one embodiment of the invention, backlight module comprise turn
Parallel operation 110, many string light emitting diode 120(i.e. light-emitting diode group), microcontroller 130, resistance modulation mould
Group 140 and booster circuit 150.Microcontroller 130 is electrically connected to transducer 110, in order to according to input signal
Produce pulse width modulation signal to transducer 110.Resistance modulation module 140 is coupled to transducer 110 and micro-
Controller 130, exports corresponding resistance in order to the working cycle (Duty cycle) according to pulse width modulation signal
Value.Booster circuit 150 is coupled to transducer 110 and many string light emitting diodes 120, in order to by input voltage source
The input voltage vin of 160 boosts to the output voltage of high potential, and provides many string light emitting diodes 120
Its output voltage.Booster circuit 150 comprises switch 151, and switchs 151 according to resistance modulation module 140
Operation signal and pulse width modulation signal corresponding to resistance are unlocked and close.
In the embodiment of Fig. 1, transducer 110 comprises operation signal and produces module 114, and operation signal produces
Module 114 is electrically connected to resistance modulation module 140, and operation signal produces module 114 according to resistance modulation module
The resistance of 140 produces the operation signal of correspondence；Transducer 110 is by pulse width modulation signal and operation signal
Computing generation boosting rectifier control signal in the way of logic product (logical product), and booster circuit 150
Switch 151 the most thus boosting rectifier control signal controls.In this embodiment, the resistance of resistance modulation module 140
When being worth the biggest, operation signal produces the corresponding operation signal produced of module 114 and has the lowest frequency.
In the embodiment of Fig. 1, booster circuit 150 comprises inductance 152, Zener diode 153 and electric capacity
154.Inductance 152 is electrically connected between the anode of input voltage source 160 and Zener diode 153；Zener two
The negative terminal of pole pipe 153 then for the outfan of booster circuit 150 and electrically connects with many string light emitting diodes 120；
The two ends of electric capacity 154 electrically connect with negative terminal and the earth terminal of Zener diode 153 the most respectively.First switch
151 is transistor, and it has drain electrode, source electrode and grid, and its drain electrode is coupled to Zener diode anode, source electrode
Being coupled to ground voltage, grid is then coupled to transducer 110.In another embodiment, the first switch 151
Can be electronic switch, it has the first end, the second end and control end, and its first end is coupled to Zener two pole
Pipe anode, the second end is coupled to ground voltage, controls end and is then coupled to transducer 110.Switch 151 bases
The boosting rectifier control signal of transducer 110 output carrys out on or off.When switching 151 conducting, will be from input
Voltage Vin imports electric current Ii and flows through inductance 152 and switch 151, and now importing electric current Ii can be to inductance 152
Filling energy, electric capacity 154 is then in exoergic state；When switching 151 cut-off, because the end electricity of electric capacity 154
Pressure Vc exceeds input voltage vin, and direct voltage source 160 will no longer import electric current and enter in inductance 152, so
And due to the electric characteristics of inductance, can't be immediately turned off at the importing electric current Ii of turn on period, and can flow into
Electric capacity 154, now inductance 152 is in exoergic state, electric capacity 154 be then in fill can state, and electric capacity 154
Terminal voltage Vc therefore can be maintained above the high potential of input voltage vin.
Many string light emitting diodes 120 are in order to provide backlight, and many string light emitting diodes 120 are coupled to transducer 110
With booster circuit 150.The driving voltage of many string light emitting diodes 120 is carried by the output voltage of booster circuit 150
Confession, makes light emitting diode be turned on luminescence.In this embodiment, the conducting electric current of light emitting diode will be logical
Crossing back coupling foot position 113 and be communicated back to transducer 110, transducer 110 is feedback according to this electric current and is adjusted operation signal
Working cycle (duty cycle) to maintain fixing current potential by driving voltage, it is ensured that stablizing of backlight.
In the embodiment of Fig. 1, resistance modulation module 140 comprises first resistance the 142, second resistance 144 and
Second switch 146.Second resistance 144 is in parallel with the first resistance 142, and second switch 146 is series at second
Resistance 144.Second switch 146 is transistor, and it has drain electrode, source electrode and grid, and its drain electrode is coupled to the
Two resistance 144, source electrode is coupled to ground voltage, and grid is then coupled to microcontroller 130.Implement in another
In example, second switch 146 can be electronic switch, and it has the first end, the second end and controls end, and it is the years old
One end is coupled to the second resistance 144, and the second end is coupled to ground voltage, controls end and is then coupled to microcontroller
130。
In the embodiment of Fig. 1, when the working cycle of pulse width modulation signal is more than or equal to predetermined value,
The second switch 146 of microcontroller 130 meeting off-resistances modulation module 140 so that resistance modulation module 140
Resistance be the resistance of the first resistance 142；Otherwise, it is less than in the working cycle of pulse width modulation signal
During predetermined value, the second switch 146 of microcontroller 130 meeting conducting resistance modulation module 140 so that resistance is adjusted
The resistance becoming module 140 is the first resistance 142 and resistance of the second resistance 144 parallel connection.Therefore, by micro-
The controller 130 control to second switch 146, will can change the resistance of resistance modulation module 140, and then
Change the cycle of operation signal.
Refer to the associative operation signal figure that Fig. 2, Fig. 2 are backlight module, it comprises pulse width modulation news
Number, operating signal, boosting rectifier control signal is in the first period T1, the second period T2 and the 3rd period T3
State.When the first period T1, backlight module operates in the case of normal brightness, and its pulse width modulation is interrogated
Number working cycle more than operation three times of the signal cycle, and boosting rectifier control signal remains to maintain booster circuit
Output voltage, makes light emitting diode stabilized illumination, and now switch 146 is cut off, resistance modulation module 140
Resistance be the resistance of the first resistance 142；When the second period T2, backlight module operates in brightness on the low side
In the case of, now the working cycle of pulse width modulation signal is less than three times of the operation signal cycle, and boosts
Therefore the working cycle controlling signal becomes the ofest short duration and is unable to maintain that the output voltage of booster circuit 150,
Light emitting diode is then likely to occur the situation that flicker is unstable, therefore when the 3rd period T3, microcontroller 130
Can be turned on by switch 146, therefore the resistance of resistance modulation module 140 reduces, and operation frequency produces module 114
Can to resistance producing the operation signal that frequency is higher, and make when the 3rd period T3, pulse width be adjusted
The working cycle becoming signal can maintain three times more than the operation signal cycle so that boosting rectifier control signal can maintain
The output voltage of booster circuit, and light emitting diode energy stabilized illumination.
In above-described embodiment, this predetermined value is when the second switch 146 of resistance modulation module 140 is cut-off
Time operation signal produce three times of the module 114 corresponding operation signal cycle produced, and in this same embodiment
In, when backlight module returns to the state of normal brightness from the 3rd period T3 luminance state on the low side, then work as pulse
When the working cycle of width modulation signal is more than above-mentioned predetermined value, microcontroller 130 can will switch 146 sections
Only, and therefore the resistance of resistance modulation module 140 can rise, and operation signal produces module 114 can be to should
Resistance produces the relatively low operation signal of frequency to avoid backlight module to cause boosting because of operation in higher frequency
Efficiency reduces.The most above-mentioned predetermined value is presently preferred embodiments of the present invention, those skilled in the art, when can root
According to the practical situation of System Operation, revise this predetermined value to meet system requirements, such as in another embodiment,
This predetermined value can be that operation signal produces module 114 correspondence when the second switch of resistance modulation module is for cut-off
The cycle of the operation signal produced.
Refer to the schematic diagram of the backlight module that Fig. 3, Fig. 3 are another embodiment of the present invention, itself and above-mentioned Fig. 1
The difference of embodiment be only that resistance modulation module 240.In the embodiment of Fig. 3, resistance modulation module
240 comprise variable resistance 242.Variable resistance 242 is coupled to microcontroller 130, and at pulse width modulation
When the working cycle of signal is more than or equal to predetermined value, microcontroller 130 can increase the resistance of variable resistance 242
Value, that is the resistance of resistance modulation module 240, and then downgrade the frequency of operation signal；And in pulse width
When the working cycle of modulation signal is less than predetermined value, microcontroller 130 can downgrade the resistance of variable resistance 242,
That is the resistance of resistance modulation module 240, and then increase the frequency of operation signal.This is by changing operation news
Number frequency maintain the mode of output voltage of booster circuit 150 then identical with the embodiment of Fig. 1, at this
The most separately repeat.
Refer to the control method flow chart that Fig. 4, Fig. 4 are backlight module of the present invention.The controlling party of backlight module
Method comprises the steps of
410: microcontroller 130 produces pulse width modulation signal according to input signal；
420: resistance modulation module 140 or 240 adjusts resistance according to the working cycle of pulse width modulation signal
The resistance of modulation module 140 or 240；
430: operation signal produces module 114 and produces operation according to the resistance of resistance modulation module 140 or 240
Signal；
440: transducer 110 controls the of booster circuit 150 according to operation signal and pulse width modulation signal
The unlatching of one switch 151 and closedown, to control to be coupled to the multi-group light-emitting diode 120 of booster circuit 150
Produce backlight.
In step 410, input signal corresponds to display system (this display system is provided backlight by backlight module)
Required backlight illumination, required brightness is the strongest, then the working cycle of pulse width modulation signal is the biggest；Required
Brightness is the lowest, then the working cycle of pulse width modulation signal is the least.Step 420 is interrogated at pulse width modulation
Number working cycle more than or equal to predetermined value time, the second switch 146 of off-resistances modulation module 140, with
Increase the resistance of resistance modulation module 140, or increase the resistance of variable resistance 242, to increase resistance modulation
The resistance of module 240, and step 430 is i.e. according to this resistance, produces the operation signal that a class frequency is relatively low.
Otherwise, in same embodiment, when the working cycle of pulse width modulation signal is less than predetermined value, step
The second switch 146 of 420 meeting conducting resistance modulation modules 140, to downgrade the resistance of resistance modulation module 140,
Or downgrade the resistance of variable resistance 242, to downgrade the resistance of resistance modulation module 240, and step 430 is i.e.
The operation signal that a class frequency is higher is produced according to this resistance.In an embodiment, predetermined value can be operation
Three times of signal cycle.Step 440 controls booster circuit 150 according to operation signal and pulse width modulation signal
The unlatching of the first switch 151 and closedown, to control to be coupled to the multi-group light-emitting diode of booster circuit 150
120 produce backlight.In an embodiment, transducer 110 is according to operation signal and pulse width modulation signal
Logic product (Logical product) controls unlatching and the closedown of the first switch 151.
In sum, backlight module of the present invention can be in the case of backlight be in brightness on the low side, by changing electricity
The resistance of resistance modulation module 140,240, improves the frequency of operation signal, with stable maintenance booster circuit 150
Output voltage, and solve prior art be set forth in low-light level screen and be easily generated the problem that flicker is unstable.Simultaneously
In the case of backlight is in normal brightness, backlight module of the present invention also can reduce the frequency of operation signal, with
Promote the efficiency of booster circuit 150.
The foregoing is only presently preferred embodiments of the present invention, all equalizations done according to scope of the present invention patent
Change and modification, all should belong to the covering scope of the present invention.
Claims (9)
1. a backlight module, it is characterised in that comprise:
Transducer；
Light-emitting diode group, is coupled to this transducer, in order to provide backlight；
Microcontroller, is coupled to this transducer, in order to produce pulse width modulation signal extremely according to input signal
This transducer；
Resistance modulation module, is coupled to this transducer and this microcontroller, in order to according to this pulse width modulation
The resistance of the working cycle output correspondence of signal, this resistance modulation module comprises: the first resistance, the second resistance
And second switch, this second resistor coupled in parallel in this first resistance, this second switch be series at this second resistance and
Being coupled to this microcontroller, when this working cycle of this pulse width modulation signal is less than predetermined value, this is micro-
Controller turns on this second switch of this resistance modulation module；And
Booster circuit, is coupled to this transducer and this light-emitting diode group, in order to by the first dc voltage boost
To the second DC voltage, so that this light-emitting diode group to provide this second DC voltage, this booster circuit comprises
First switch, wherein this first switch is according to operation signal corresponding to this resistance and this pulse width modulation signal
Open and close.
2. backlight module as claimed in claim 1, it is characterised in that when this pulse width modulation signal
This working cycle more than or equal to this predetermined value time, this microcontroller end this resistance modulation module this second
Switch.
3. backlight module as claimed in claim 1, it is characterised in that this resistance modulation module this second
Switch is transistor or electronic switch.
4. backlight module as claimed in claim 1, it is characterised in that this resistance modulation module comprises variable
Resistance.
5. the control method of a backlight module, it is characterised in that comprise the steps of
Pulse width modulation signal is produced according to input signal；
Working cycle according to this pulse width modulation signal adjusts the resistance of resistance modulation module, and this resistance is adjusted
Become module and comprise the first resistance, the second resistance and second switch, this first resistance and this second resistor coupled in parallel,
This second switch and this second resistant series, this resistance is determined with this second resistance by this first resistance, this tune
Become this resistance step to comprise, turn on this second switch of this resistance modulation module；
Operation signal is produced according to this resistance；And
Control the first of booster circuit according to this operation signal and this pulse width modulation signal to switch on
And close, to control to be coupled to the light-emitting diode group generation backlight of this booster circuit and transducer.
6. the control method of backlight module as claimed in claim 5, it is characterised in that according to this pulse width
This working cycle of degree modulation signal adjusts this resistance step and comprises, when this work of this pulse width modulation signal
When cycle of making is less than predetermined value, downgrade this resistance, to promote the frequency of this operation signal.
7. the control method of backlight module as claimed in claim 5, it is characterised in that according to this pulse width
This working cycle of degree modulation signal adjusts this resistance step and comprises, when this work of this pulse width modulation signal
When cycle of making is more than or equal to predetermined value, increase this resistance, to reduce the frequency of this operation signal.
8. the control method of backlight module as claimed in claim 7, it is characterised in that this resistance modulation mould
Group comprises the first resistance, the second resistance and second switch, and this first resistance and this second resistor coupled in parallel, this is opened
Closing and this second resistant series, this resistance is determined with this second resistance by this first resistance, and this increases this resistance
Step comprises, and ends this second switch of this resistance modulation module.
9. the control method of backlight module as claimed in claim 5, it is characterised in that interrogate according to this operation
Number and this pulse width modulation signal control this first switch on and close according to this operation signal and
The logic product of this pulse width modulation signal controls this and first switches on and close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003733.0A CN103781245B (en) | 2014-01-06 | 2014-01-06 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410003733.0A CN103781245B (en) | 2014-01-06 | 2014-01-06 | Backlight module |
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| Publication Number | Publication Date |
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| CN103781245A CN103781245A (en) | 2014-05-07 |
| CN103781245B true CN103781245B (en) | 2016-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410003733.0A Active CN103781245B (en) | 2014-01-06 | 2014-01-06 | Backlight module |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109859721A (en) * | 2019-04-02 | 2019-06-07 | Oppo广东移动通信有限公司 | Brightness of display screen adjusting method, device, mobile terminal and storage medium |
| WO2023024454A1 (en) * | 2022-02-18 | 2023-03-02 | 京东方数字科技有限公司 | Drive circuit, drive method, and electronic price tag system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330785A (en) * | 2008-08-04 | 2008-12-24 | 梁莉丽 | High voltage AC light-adjusting controller for general constant-current LED |
| US20100060181A1 (en) * | 2008-09-05 | 2010-03-11 | Seoul Semiconductor Co., Ltd. | Ac led dimmer and dimming method thereby |
| US20120256610A1 (en) * | 2011-04-05 | 2012-10-11 | Advanced Analogic Technologies, Inc. | Step Down Current Mirror for DC/DC Boost Converters |
-
2014
- 2014-01-06 CN CN201410003733.0A patent/CN103781245B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101330785A (en) * | 2008-08-04 | 2008-12-24 | 梁莉丽 | High voltage AC light-adjusting controller for general constant-current LED |
| US20100060181A1 (en) * | 2008-09-05 | 2010-03-11 | Seoul Semiconductor Co., Ltd. | Ac led dimmer and dimming method thereby |
| US20120256610A1 (en) * | 2011-04-05 | 2012-10-11 | Advanced Analogic Technologies, Inc. | Step Down Current Mirror for DC/DC Boost Converters |
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