CN103596344B - A kind of LED drive system and method - Google Patents
A kind of LED drive system and method Download PDFInfo
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- CN103596344B CN103596344B CN201310635026.9A CN201310635026A CN103596344B CN 103596344 B CN103596344 B CN 103596344B CN 201310635026 A CN201310635026 A CN 201310635026A CN 103596344 B CN103596344 B CN 103596344B
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Abstract
The embodiment of the invention discloses a kind of LED drive system and method, one end of switch element is connected with LED unit, the other end is when receiving the control signal of lasting Preset Time, it is connected with charhing unit in the described Preset Time that described control signal is lasting, when not receiving described control signal, it is connected with driving power supply；Charhing unit, for charging for LED unit, described charhing unit is that the charging rate of LED unit charging is faster than the charging rate that described driving power supply is LED unit charging；Described driving power supply, is used for providing conducting electric current；Visible, when driving LED luminescence, first pass through to use to have and than the higher charhing unit of output electric current of the constant-current source being normally used for driving, LED unit therein is charged, the constant-current source being switched to when charging to close to forward conduction voltage be normally used for driving LED unit carries out continuing charging until conducting LED unit, thus reaches the effect of the quick charge to LED unit.
Description
Technical field
The present invention relates to field of electric control, particularly relate to a kind of LED drive system and method.
Background technology
Light-Emitting Diode (Light-Emitting Diode, LED) has been widely used on a display screen；In recent years
Come, along with aspects such as LED Display Technique and the development of technique, LED density, reliability, display effects
Being greatly promoted, being applied to indoor large scale display screen technology becomes the hot spot technology that current LED shows.
Indoor display screen, for general display screen, drives the size of current of each LED unit to greatly reduce,
It is reduced to several milliamperes of even microampere ranks from tens milliamperes.
As it is shown in figure 1, a LED unit can be equivalent to luminescence unit 101, parasitic capacitance 102 and
Internal resistance 103.The general type of drive using current source, drives the luminescence of LED.Due to electric capacity 102
Exist current source firstly the need of LED after electric capacity 102 being charged to the forward conduction voltage of LED just start into
Enter luminance.When the driving electric current driving LED is bigger, the time that charging process needs is comparatively short；
When driving electric current less, the time that charging process needs is the most long.
So as several milliamperes of this use of the indoor display screen even other low current of microampere order drives LED mono-
During unit, need long to the time of electric capacity 102 charging, thus cause indoor display screen that display face occurs
Colo(u)r bias, GTG lack the problem that even cannot normally show.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of LED drive system and method, use
Corresponding charging voltage or charging current the parasitic capacitance 102 of LED unit is carried out after quick charge again with
Normal drive current drives LED unit luminous.
The embodiment of the invention discloses following technical scheme:
A kind of LED drive system, including switch element, charhing unit, driving power supply and light emitting diode
LED unit:
One end of described switch element is connected with described LED unit, the other end receive persistently preset time
Between control signal time, be connected with charhing unit in the described Preset Time that described control signal is lasting,
When not receiving described control signal, disconnect the connection with described LED unit, and be connected with driving power supply,
Described Preset Time is relevant to preset charge voltage, and described preset charge voltage is less than described LED unit
Conducting voltage；
Described charhing unit, for when being connected with described switch element, charges for described LED unit,
Described charhing unit is that to be faster than described driving power supply be described LED for the charging rate of described LED unit charging
The charging rate of unit charging；
Described driving power supply, for when being connected with described switch element, provides for described LED unit and leads
Galvanization；
Described LED unit, for starting normal work after connecting conducting electric current.
Preferably, described charhing unit is specially constant pressure source, and the output electric current of described constant pressure source is more than described
Drive the output electric current of power supply；
Accordingly, described Preset Time is specially the first preset time t 1:
t1=RC*Ln[(V1-V0)/(V1-Vt1)]
Wherein:
R is the internal resistance value of described LED unit；
C is the capacitance of described LED unit；
V1 is the turn-on voltage of described LED unit；
V0 is the initial voltage value of described LED unit；
Vt1 is the preset charge voltage of described LED unit, the most described LED unit with described constant pressure source
The magnitude of voltage reached after first preset time t 1 that is connected.
Preferably,
The output voltage of described constant pressure source be less than and close to the forward conduction voltage of LED.
Preferably, described charhing unit is specially current source, and the output electric current of described current source is more than described
Drive the output electric current of power supply；
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charge voltage of described LED unit, the most described LED unit with described current source
The magnitude of voltage reached after second preset time t 2 that is connected；
V0 is the initial voltage value of described LED unit；
N is the number of the described LED unit being simultaneously charged；
C is the capacitance of described LED unit；
I is the output electric current of described current source.
Preferably,
Described driving power supply is specially constant-current source.
A kind of LED driving method, including:
When switch element receives the control signal of lasting Preset Time, continued in described control signal
Described Preset Time in connection LED unit and charhing unit；
Described charhing unit, when being connected with described switch element, charges for described LED unit, described in fill
Electric unit is that to be faster than described driving power supply be that described LED unit is filled for the charging rate of described LED unit charging
The charging rate of electricity；
When not receiving described control signal, described switch element disconnects described LED unit and described fills
The connection of electric unit, and connect described LED unit and drive power supply, wherein, described Preset Time is with pre-
If charging voltage is correlated with, described preset charge voltage is less than the conducting voltage of described LED unit；
Described driving power supply, when being connected with described switch element, provides conducting electric current for described LED unit；
Described LED unit starts normal work after reaching conducting voltage.
Preferably, described charhing unit is specially constant pressure source, and the output electric current of described constant pressure source is more than described
Drive the output electric current of power supply；
Accordingly, described Preset Time is specially the first preset time t 1:
t1=RC*Ln[(V1-V0)/(V1-Vt1)]
Wherein:
R is the internal resistance value of described LED unit；
C is the capacitance of described LED unit；
V1 is the turn-on voltage of described LED unit；
V0 is the initial voltage value of described LED unit；
Vt1 is the preset charge voltage of described LED unit, the most described LED unit with described constant pressure source
The magnitude of voltage reached after first preset time t 1 that is connected.
Preferably,
The output voltage of described constant pressure source be less than and close to the forward conduction voltage of LED.
Preferably, described charhing unit is specially current source, and the output electric current of described current source is more than described
Drive the output electric current of power supply；
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charge voltage of described LED unit, the most described LED unit with described current source
The magnitude of voltage reached after second preset time t 2 that is connected；
V0 is the initial voltage value of described LED unit；
N is the number of the described LED unit being simultaneously charged；
C is the capacitance of described LED unit；
I is the output electric current of described current source.
Preferably,
Described driving power supply is specially constant-current source.
By technique scheme it can be seen that when driving LED luminescence, first pass through use and there is ratio normally
LED unit therein is charged by the higher charhing unit of output electric current of the constant-current source for driving,
The constant-current source being switched to when charging to close to LED forward conduction voltage be normally used for driving LED unit enters
Row continues charging until conducting LED unit, thus reaches the effect of the quick charge to LED unit.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a LED unit primary structure schematic diagram；
Fig. 2 is the system construction drawing of a kind of LED drive system of the present invention；
The LED unit charging interval schematic diagram that Fig. 3 is；
Fig. 4 is the method flow diagram of the present invention a kind of LED driving method.
Detailed description of the invention
Embodiments provide a kind of LED drive system and method.On the one hand, LED is being driven to set
During preparation light, first pass through and use the output voltage or output electricity having than the constant-current source being normally used for driving
Flow higher charhing unit LED unit therein is charged, when charging to close to LED forward conduction
During voltage, the constant-current source being switched to be normally used for driving LED unit carries out continuing charging until turning on LED
Unit, thus reaches the effect of the quick charge to LED unit.
On the other hand, can according to the constant pressure source corresponding to different choice of application scenarios or the condition of use or
Current source is that LED unit carries out quick charge as charhing unit, further increases the application of the present invention
Scope.
Understandable, below in conjunction with the accompanying drawings for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
The embodiment of the present invention is described in detail.
Embodiment one
Referring to Fig. 2, it is the system construction drawing of a kind of LED drive system of the present invention, and this system includes
Switch element 201, charhing unit 202, driving power supply 203 and LED unit 204:
One end of described switch element 201 is connected with described LED unit 204, and the other end is held receiving
When continuing the control signal of Preset Time, with charging in the described Preset Time that described control signal is lasting
Unit 202 is connected, and when not receiving described control signal, disconnects the connection with described LED unit 204,
And be connected with driving power supply 203, described Preset Time is relevant to preset charge voltage, described preset charged
Voltage is less than the conducting voltage of described LED unit 104；
Described charhing unit 202, for when being connected with described switch element 201, mono-for described LED
Unit 204 charging, the charging rate that described charhing unit 202 charges for described LED unit 204 is faster than institute
State the charging rate driving power supply 203 to be the charging of described LED unit 204；
Described driving power supply 203, for when being connected with described switch element 201, mono-for described LED
Unit 204 provides conducting electric current；
Preferably, described driving power supply is specially constant-current source.
Described LED unit 204, for starting normal work after reaching conducting voltage.
The technical scheme is that increase is driven based on traditional matrix form power drives LED display mode
Streaming current accelerates to rise module and realizes.It is to say, after connecting with the mains for LED device, according to difference
The display mode of LED device or working method, start to enter the LED unit in LED device successively
Row charging, so that it is luminous, is carried out as a example by the matrix LED unit square formation of the N*M shown in Fig. 2
Illustrate, when the LED unit taking turns to wherein jth row carries out luminescence, to should row LED unit i.e. with this
The switch element 201 that row LED unit is connected receives control signal, connects charhing unit 202 and jth
The LED unit of row is the same with traditional matrix form power drives LED, for the control signal of jth row
Time effectively, the on-off circuit gating of the ground connection of this row, now other row control signal is invalid, and electric current only flows
Cross the LED unit of jth row.The connection connecting charhing unit 202 and the LED unit of jth row preset
Time is relevant to presetting the charging voltage arranged, and in general, can preset one and turn on close to LED unit
The magnitude of voltage of voltage to add the speed of charging quickly as far as possible, preset charge voltage closer to conducting voltage,
The Connection Time preset will be the longest.When corresponding switch element 201 and charhing unit 202 Connection Time
After reaching Preset Time, i.e. in the LED unit of jth row, the magnitude of voltage of electric capacity reaches preset charge voltage
Time, corresponding switch element 201 is quickly switched into and drives power supply 203, will drive power supply 203 and the
The LED unit 204 of j row is connected, the LED unit 204 driving power supply 203 to continue as jth row enter
Row charging between preset charge voltage to conducting voltage, until the LED unit 204 of jth row reaches
Starting luminescence after conducting voltage, corresponding switch element 201 continues connection and drives power supply 203 and jth row
LED unit 204 is until receiving other control signals.It is to say, utilize technical scheme,
When accelerating the both end voltage charging to the electric capacity in LED unit close to LED conducting voltage, stop adding
Speed, the driving power supply being switched to high accurancy and precision proceeds remaining charging driving, the electric current of charge power supply
LED unit can be injected at once, then light output and the current amplitude flowed through and the duty of LED unit
Ratio is directly proportional.
Be accelerated charging charhing unit, can by be with voltage in the way of, it is also possible in the way of electric current
It is accelerated, will be respectively directed to be accelerated the skill of charging in the way of voltage and in the way of electric current below
Art scheme is described.
In the way of voltage, i.e. when above-mentioned charhing unit 202 is specially a constant pressure source:
Preferably, described charhing unit is specially constant pressure source, and the output electric current of described constant pressure source is more than described
Drive the output electric current of power supply；
Accordingly, described Preset Time is specially the first preset time t 1:
t1=RC*Ln[(V1-V0)/(V1-Vt1)]
Wherein:
R is the internal resistance value of described LED unit；
C is the capacitance of described LED unit；
V1 is the turn-on voltage of described LED unit；
V0 is the initial voltage value of described LED unit；
Vt1 is the preset charge voltage of described LED unit, the most described LED unit with described constant pressure source
The magnitude of voltage reached after first preset time t 1 that is connected.
In general, the span of the output voltage of constant pressure source both can be less than the electric conduction of LED unit
Pressure value, it is also possible to more than the turn-on voltage of LED unit, can be according to the work essence of actual working environment
Degree is adjusted, and the embodiment of the present invention provides a preferred span to the output voltage of constant pressure source,
The output voltage of the most described constant pressure source be less than and close to the forward conduction voltage of LED.At this model
When enclosing interior, even if the operating accuracy of actual working environment is the highest, LED unit is using constant pressure source in other words
Could not switch back into driving power supply timely after first preset time t 1 of charging, therefore constant pressure source also will not will be somebody's turn to do
LED unit driven for emitting lights, the experience that cause the user is bad.
Carry out further carrying out quick charge in the way of voltage as a example by actual application scenarios below
Bright:
Usually, the conducting voltage red light of LED in the range of 1.6v to 2.6v, blue lamp and green light exist
In the range of 2.6v to 3.8v, blue lamp 3.8v is selected to calculate.According further to the application experience of industry, 10milLED
Wafer junction capacity about 10pf, internal resistance RLAbout=560 Europe, LED display is swept in n=16 that is 16, V0=0,
Ii=4mA；GTG PWM clock 30MHZ, a GTG cycle is 3.3*10-8Second.
First the charging interval being charged the LED drive current that use of the prior art is traditional is carried out
It is calculated as follows:
If constant-current source circuit Ii, the electric capacity C of LED unitL, LED conducting voltage V1.Need LED
The electric capacity of unit is charged to LED conducting voltage V from initial voltage V0F, electric current just starts to flow from LED
Cross and controlled luminescence.Owing to a line has n LED, need all parasitic capacitances are charged, i.e. nCL。
The Time Calculation of this charging process is as follows:
U(t)=∫i(t)dt/nCL
(V1-V0)=Iit/nCL
t=(V1-V0)nCL/Ii
After bringing above-mentioned parameter into:
ti=(V1-V0)nCL/Ii=3.8*16*10*10-12/(4*10-3)=15*10-8Second=150 nanoseconds
Traditional LED drive current is i.e. used to be charged needing the GTG time more than 4 electric capacity could be filled
Full, the LED unit being electrically charged just can be made to initially enter the luminance of controlled PWM.
The calculating in charging interval when LED unit being charged as charhing unit using constant pressure source
As follows:
t1=RC*Ln[(V1-V0)/(V1-Vt1)]
Assume that preset charge voltage Vt1 is conducting voltage charging V1 9/10, and due to being equal to that V0 is
0, so [(V1-V0)/(V1-Vt)]=10
Same as a example by above-mentioned LED wafer parameter, 10milLED wafer junction capacity about 10pf, internal resistance
RLAbout=560 Europe.Charging interval t1 is:
t1=560*10*10-12ln10=1.3*10-8Second
Conducting 0 voltage range of residue 1/10 by LED unit drive power supply continue to charge to V1 time
Between be:
ti=(V1/10)nCL/Ii=1.5*10-8Second
Total charging time: t=t1+ti=2.8*10-8Second=28 nanoseconds
Visible, it is only necessary to electric capacity can be full of less than 1 GTG time so that the LED unit being electrically charged
Initially entering the luminance of controlled PWM, the charging interval has had significantly than traditional approach (150 nanosecond)
Lifting.
In the way of electric current, i.e. when above-mentioned charhing unit 202 is specially a current source:
Preferably, described charhing unit is specially current source, and the output electric current of described current source is more than described
Drive the output electric current of power supply；
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charge voltage of described LED unit, the most described LED unit with described current source
The magnitude of voltage reached after second preset time t 2 that is connected；
V0 is the initial voltage value of described LED unit；
N is the number of the described LED unit being simultaneously charged；
C is the capacitance of described LED unit；
I is the output electric current of described current source.
Carry out further carrying out quick charge in the way of voltage as a example by actual application scenarios below
Bright:
Use the example carrying out quick charge in the way of voltage equally, it may be assumed that
Usually, the conducting voltage red light of LED in the range of 1.6v to 2.6v, blue lamp and green light exist
In the range of 2.6v to 3.8v, blue lamp 3.8v is selected to calculate.According further to the application experience of industry, 10milLED
Wafer junction capacity about 10pf, internal resistance RLAbout=560 Europe, LED display, V are swept in n=16 that is 160=0,
Ii=4mA；GTG PWM clock 30MHZ, a GTG cycle is 3.3*10-8Second.
The charging interval using traditional LED drive current to be charged was 150 nanoseconds.
The calculating in charging interval when LED unit being charged as charhing unit using current source
As follows:
t2=(Vt2-V0)nC/I
Still calculate by above-mentioned LED parameter, it is assumed that the output electric current I of the described current source chosen is described
Drive the driving electric current I of power supplyi(40mA) 10 times carry out quick charge, still charge to described
Quick charge is terminated behind the 9/10 of conducting voltage V1 of LED unit.
t2=(9VF/10)nCL/(10Ii)=(3.8*9/10)*16*10*10-12/(10*4*10-3)=13 nanosecond
Next switch to drive power supply, to drive the output electric current I of power supplysThe time charging to V1 is:
ti=(VF/10)nCL/Ii=(3.8*1/10)*16*10*10-12/(4*10-3)=15 nanosecond
Total charging time: t=t2+ti=28 nanoseconds
Visible, it is only necessary to electric capacity can be full of less than the time of 1 GTG so that the LED being electrically charged is mono-
Unit initially enters the luminance of controlled PWM, and the charging interval has had greatly than traditional approach (150 nanosecond)
Big lifting.
The embodiment of the present invention can also be shown by the way of linear schedule further, as it is shown on figure 3,
It is the LED unit charging interval schematic diagram of the present invention, and transverse axis coordinate therein is the time:
301 is the charging interval ideally, and low level is off working state, and high level is for sending out after conducting
The duty of light, A time point is the time point that this LED unit of default starts luminescence, preferable shape
Under state be in LED unit electric capacity moment be full of, luminescence of starting working.
302 is control signal, points out in the A time, according to the setting of system, continues the control of Preset Time
Signal processed sends, and controls the circuit connection at this LED unit place, starts to accept electric current input, and this is preset
The persistent period Duan Weicong A time point of time is to B time point, the position of B time point and preset charged electricity
Pressure is relevant, the conducting voltage the closer to LED unit that preset charge voltage is arranged, then B Time interval from
C time point is the nearest.
303 accelerate the charging interval under charging for the present invention, and low level is off working state, and high level is for leading
Duty luminous after logical, it is seen then that the A time point sent from control signal is to starting luminescence
Time period AB between B time point is the time using the quick charge under technical solution of the present invention, the most just
Being the lasting Preset Time of described control signal, C time point is that conducting starts luminous time point, time
Between section BC be use technical solution of the present invention switch back into driving power supply after continue to be charged until turning on
Charging interval.
304 is the charging interval of charging under prior art, and low level is off working state, and high level is conducting
The duty of rear luminescence, it is seen then that the A time point sent from control signal is to starting luminous work shape
The AB+BC that time period AD between the D time point of state is considerably longer than in 303, needs to consume more
Time just can complete the charging to this LED unit.
Be can be seen that by the present embodiment, on the one hand, when driving LED luminescence, first pass through use and there is ratio
LED unit therein is filled by the higher charhing unit of output electric current of the constant-current source being normally used for driving
Electricity, is switched to the constant current being normally used for driving LED unit when charging to close to LED forward conduction voltage
Source carries out continuing charging until conducting LED unit, thus reaches the effect of the quick charge to LED unit.
On the other hand, can according to the constant pressure source corresponding to different choice of application scenarios or the condition of use or
Current source is that LED unit carries out quick charge as charhing unit, further increases the application of the present invention
Scope.
Embodiment two
Corresponding with above-mentioned a kind of LED drive system, the embodiment of the present invention additionally provides a kind of LED and drives
Method.Referring to Fig. 4, it is the method flow diagram of the present invention a kind of LED driving method, the method bag
Include:
S401: when switch element receives the control signal of lasting Preset Time, in described control signal
Connection LED unit and charhing unit in lasting described Preset Time；
S402: described charhing unit, when being connected with described switch element, charges for described LED unit,
Described charhing unit is that to be faster than described driving power supply be described LED for the charging rate of described LED unit charging
The charging rate of unit charging；
S403: when not receiving described control signal, described switch element disconnects described LED unit and institute
State the connection of charhing unit, and connect described LED unit and drive power supply, wherein, described Preset Time
Relevant to preset charge voltage, described preset charge voltage is less than the conducting voltage of described LED unit；
S404: described driving power supply, when being connected with described switch element, provides for described LED unit and leads
Galvanization；
S405: described LED unit starts normal work after reaching conducting voltage.
Wherein, it is preferred that described charhing unit is specially constant pressure source, the output electric current of described constant pressure source is big
Output electric current in described driving power supply；
Accordingly, described Preset Time is specially the first preset time t 1:
t1=RC*Ln[(V1-V0)/(V1-Vt1)]
Wherein:
R is the internal resistance value of described LED unit；
C is the capacitance of described LED unit；
V1 is the turn-on voltage of described LED unit；
V0 is the initial voltage value of described LED unit；
Vt1 is the preset charge voltage of described LED unit, the most described LED unit with described constant pressure source
The magnitude of voltage reached after first preset time t 1 that is connected.
Preferably, the output voltage of described constant pressure source be less than and close to the forward conduction voltage of LED.
Preferably, described charhing unit is specially current source, and the output electric current of described current source is more than described driving
The output electric current of power supply；
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charge voltage of described LED unit, the most described LED unit with described current source
The magnitude of voltage reached after second preset time t 2 that is connected；
V0 is the initial voltage value of described LED unit；
N is the number of the described LED unit being simultaneously charged；
C is the capacitance of described LED unit；
I is the output electric current of described current source.
Preferably,
Described driving power supply is specially constant-current source.
As can be seen from the above-described embodiment, on the one hand, when driving LED luminescence, first pass through use and have
Than the higher charhing unit of output electric current of the constant-current source being normally used for driving, LED unit therein is carried out
Charging, is switched to the perseverance being normally used for driving LED unit when charging to close to LED forward conduction voltage
Stream source carries out continuing charging until conducting LED unit, thus reaches the effect of the quick charge to LED unit
Really.
On the other hand, can according to the constant pressure source corresponding to different choice of application scenarios or the condition of use or
Current source is that LED unit carries out quick charge as charhing unit, further increases the application of the present invention
Scope.
It should be noted that one of ordinary skill in the art will appreciate that and realize in above-described embodiment method
All or part of flow process, can be by computer program and completes to instruct relevant hardware, described
Program can be stored in a computer read/write memory medium, and this program is upon execution, it may include as above-mentioned
The flow process of the embodiment of each method.Wherein, described storage medium can be magnetic disc, CD, read-only storage
Memory body (Read-Only Memory, ROM) or random store-memory body (Random Access
Memory, RAM) etc..
Above a kind of LED drive system provided by the present invention and method are described in detail, herein
In apply specific embodiment principle and the embodiment of the present invention be set forth, above example
Method and the core concept thereof being only intended to help to understand the present invention is described；Simultaneously for this area one
As technical staff, according to the thought of the present invention, the most all can change
Part, in sum, this specification content should not be construed as limitation of the present invention.
Claims (6)
1. a LED drive system, it is characterised in that include switch element, charhing unit, driving
Power supply and LED unit:
One end of described switch element is connected with described LED unit, the other end receive persistently preset time
Between control signal time, be connected with charhing unit in the described Preset Time that described control signal is lasting,
When not receiving described control signal, disconnect the connection with described LED unit, and be connected with driving power supply,
Described Preset Time is relevant to preset charge voltage, and described preset charge voltage is less than described LED unit
Conducting voltage；
Described charhing unit, for when being connected with described switch element, charges for described LED unit,
Described charhing unit is that to be faster than described driving power supply be described LED for the charging rate of described LED unit charging
The charging rate of unit charging；
Described driving power supply, for when being connected with described switch element, provides for described LED unit and leads
Galvanization；
Described LED unit, for starting normal work after connecting conducting electric current；
Wherein, described charhing unit is specially constant pressure source, the output electric current of described constant pressure source be more than described in drive
The output electric current in galvanic electricity source；
Accordingly, described Preset Time is specially the first preset time t 1:
T1=RC*Ln [(V1-V0)/(V1-Vt1)]
Wherein:
R is the internal resistance value of described LED unit；
C is the capacitance of described LED unit；
V1 is the turn-on voltage of described LED unit；
V0 is the initial voltage value of described LED unit；
Vt1 is the preset charge voltage of described LED unit, the most described LED unit with described constant pressure source
The magnitude of voltage reached after first preset time t 1 that is connected；
Or, wherein, described charhing unit is specially current source, and the output electric current of described current source is more than
The output electric current of described driving power supply；
Accordingly, described Preset Time is specially the second preset time t 2:
T2=(Vt2-V0) nC/I
Wherein:
Vt2 is the preset charge voltage of described LED unit, the most described LED unit with described current source
The magnitude of voltage reached after second preset time t 2 that is connected；
V0 is the initial voltage value of described LED unit；
N is the number of the described LED unit being simultaneously charged；
C is the capacitance of described LED unit；
I is the output electric current of described current source.
System the most according to claim 1, it is characterised in that
The output voltage of described constant pressure source be less than and close to the forward conduction voltage of described LED unit.
System the most according to claim 1, it is characterised in that
Described driving power supply is specially constant-current source.
4. a LED driving method, it is characterised in that including:
When switch element receives the control signal of lasting Preset Time, in the institute that control signal is lasting
State connection LED unit and charhing unit in Preset Time；
Described charhing unit, when being connected with described switch element, charges for described LED unit, described in fill
Electric unit be described LED unit charging charging rate be faster than drive power supply be described LED unit charging
Charging rate；
When not receiving described control signal, described switch element disconnects described LED unit and described charging
The connection of unit, and connect described LED unit and drive power supply, wherein, described Preset Time is with default
Charging voltage is correlated with, and described preset charge voltage is less than the conducting voltage of described LED unit；
Described driving power supply, when being connected with described switch element, provides conducting electric current for described LED unit；
Described LED unit starts normal work after reaching conducting voltage；
Wherein, described charhing unit is specially constant pressure source, the output electric current of described constant pressure source be more than described in drive
The output electric current in galvanic electricity source；
Accordingly, described Preset Time is specially the first preset time t 1:
T1=RC*Ln [(V1-V0)/(V1-Vt1)]
Wherein:
R is the internal resistance value of described LED unit；
C is the capacitance of described LED unit；
V1 is the turn-on voltage of described LED unit；
V0 is the initial voltage value of described LED unit；
Vt1 is the preset charge voltage of described LED unit, the most described LED unit with described constant pressure source
The magnitude of voltage reached after first preset time t 1 that is connected；
Or, wherein, described charhing unit is specially current source, and the output electric current of described current source is more than
The output electric current of described driving power supply；
Accordingly, described Preset Time is specially the second preset time t 2:
T2=(Vt2-V0) nC/I
Wherein:
Vt2 is the preset charge voltage of described LED unit, the most described LED unit with described current source
The magnitude of voltage reached after second preset time t 2 that is connected；
V0 is the initial voltage value of described LED unit；
N is the number of the described LED unit being simultaneously charged；
C is the capacitance of described LED unit；
I is the output electric current of described current source.
Method the most according to claim 4, it is characterised in that
The output voltage of described constant pressure source be less than and close to the forward conduction voltage of described LED unit.
Method the most according to claim 4, it is characterised in that
Described driving power supply is specially constant-current source.
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| CN106340270A (en) * | 2016-10-19 | 2017-01-18 | 深圳市华星光电技术有限公司 | Compensating circuit and organic light emitting diode display |
| CN110867931B (en) * | 2019-12-09 | 2024-03-19 | Oppo广东移动通信有限公司 | Wireless charging module, wireless charging table and wireless charging method |
| CN113571006A (en) * | 2020-04-29 | 2021-10-29 | 联咏科技股份有限公司 | Display device and driver thereof |
| CN115206227B (en) * | 2022-05-18 | 2023-04-07 | 惠科股份有限公司 | Driving circuit of pixel unit and display panel |
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| CN1637799A (en) * | 2003-12-30 | 2005-07-13 | 晶门科技有限公司 | Method and apparatus for applying adaptive precharge to an electroluminescence display |
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