CN103596344A - LED (Light-Emitting Diode) driving system and method - Google Patents
LED (Light-Emitting Diode) driving system and method Download PDFInfo
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- CN103596344A CN103596344A CN201310635026.9A CN201310635026A CN103596344A CN 103596344 A CN103596344 A CN 103596344A CN 201310635026 A CN201310635026 A CN 201310635026A CN 103596344 A CN103596344 A CN 103596344A
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Abstract
The invention discloses an LED driving system and method. One end of a switching unit is connected with an LED unit; and the other end of the switching unit is connected with a charging unit when receiving continuous control signals in a preset time, and is connected with a driving power supply when not receiving the control signals, wherein the control signals are continuous in the preset time. The charging unit is used for charging the LED unit, wherein the charging speed at which the charging unit charges the LED unit is higher than the charging speed at which the driving power supply charges the LED unit. The driving power supply is used for providing conductive current. When an LED is driven to emit lights, the LED unit in the LED is charged by the charging unit which includes a higher output current than that of a constant current source for normally driving; and then when a positive conductive voltage is approached, the constant current source which is used for normally driving the LED unit is switched to and continuous charging is carried out till the LED unit is connected; and thus, rapid charging for the LED unit is achieved.
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) extensive use on display screen; In recent years, along with the development of LED Display Technique and technique, the aspects such as LED density, reliability, display effect promote greatly, and being applied to indoor large scale display screen technology becomes the hot spot technology that current LED shows.Indoor display screen, with respect to general display screen, drives the size of current of each LED unit to greatly reduce, and from tens milliamperes, reduces to several milliamperes of even microampere ranks.
As 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 that adopts current source, driving LED luminous.Due to electric capacity 102 exist current source first to need that electric capacity 102 is charged to the forward conduction voltage of LED after LED just start to enter luminance.When the drive current of driving LED is larger, the time that charging process needs is shorter; Hour, the time that charging process needs is just long for drive current.
When so as several milliamperes of this use of indoor display screen, even other low current of microampere order comes driving LED unit, the time of charging to electric capacity 102 needs long, causes thus indoor display screen to occur the problem that Show Color deviation, GTG disappearance even cannot normally show.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of LED drive system and method, use corresponding charging voltage or charging current to carry out after quick charge luminous with normal drive current driving LED unit again to the parasitic capacitance 102 of LED unit.
The embodiment of the invention discloses following technical scheme:
A drive system, comprises switch element, charhing unit, driving power and LED unit:
One end of described switch element is connected with described LED unit, the other end is when receiving the control signal that continues Preset Time, in the described Preset Time that described control signal continued, be connected with charhing unit, when not receiving described control signal, disconnection is connected with described LED unit, and be connected with driving power, described Preset Time is relevant to preset charged voltage, and described preset charged voltage is less than the conducting voltage of described LED unit;
Described charhing unit, for when being connected with described switch element, is the charging of described LED unit, and described charhing unit is that the charging rate of described LED unit charging is the charging rate of described LED unit charging faster than described driving power;
Described driving power, for when being connected with described switch element, for described LED unit provides On current;
Described LED unit, for starting normal operation after connecting On current.
Preferably, described charhing unit is specially constant pressure source, and the output current of described constant pressure source is greater than the output current of described driving power;
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 charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after first preset time t 1 that is connected with described constant pressure source.
Preferably,
The output voltage of described constant pressure source is to be less than and close to the forward conduction voltage of LED lamp.
Preferably, described charhing unit is specially current source, and the output current of described current source is greater than the output current of described driving power;
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after second preset time t 2 that is connected with described current source;
V0 is the initial voltage value of described LED unit;
The number that n is the described LED unit that simultaneously charges;
C is the capacitance of described LED unit;
I is the output current of described current source.
Preferably,
Described driving power is specially constant-current source.
A driving method, comprising:
When switch element receives the control signal that continues Preset Time, in the described Preset Time that described control signal continued, be communicated with LED unit and charhing unit;
Described charhing unit, when being connected with described switch element, is the charging of described LED unit, and described charhing unit is that the charging rate of described LED unit charging is the charging rate of described LED unit charging faster than described driving power;
When not receiving described control signal,, described switch element disconnects the connection of described LED unit and described charhing unit, and be communicated with described LED unit and driving power, wherein, described Preset Time is relevant to preset charged voltage, and described preset charged voltage is less than the conducting voltage of described LED unit;
Described driving power is when being connected with described switch element, for described LED unit provides On current;
Described LED unit starts normal operation after reaching conducting voltage.
Preferably, described charhing unit is specially constant pressure source, and the output current of described constant pressure source is greater than the output current of described driving power;
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 charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after first preset time t 1 that is connected with described constant pressure source.
Preferably,
The output voltage of described constant pressure source is to be less than and close to the forward conduction voltage of LED lamp.
Preferably, described charhing unit is specially current source, and the output current of described current source is greater than the output current of described driving power;
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after second preset time t 2 that is connected with described current source;
V0 is the initial voltage value of described LED unit;
The number that n is the described LED unit that simultaneously charges;
C is the capacitance of described LED unit;
I is the output current of described current source.
Preferably,
Described driving power is specially constant-current source.
By technique scheme, can be found out, when driving LED is luminous, first by use, have than the higher charhing unit of the output current of the constant-current source that is just usually used in driving LED unit is wherein charged, when charging to, be switched to the constant-current source that is just usually used in driving LED unit while approaching LED forward conduction voltage and continue charging until conducting LED unit reaches the effect to the quick charge of LED unit thus.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 a kind of LED driving method of the present invention.
Embodiment
The embodiment of the present invention provides a kind of LED drive system and method.On the one hand, when driving LED equipment is luminous, first by use, have than the output voltage of the constant-current source that is just usually used in driving or the higher charhing unit of output current LED unit is wherein charged, when charging to while approaching LED forward conduction voltage, be switched to the constant-current source that is just usually used in driving LED unit and continue charging until conducting LED unit reaches the effect to the quick charge of LED unit thus.
On the other hand, can as charhing unit, be that LED unit carries out quick charge according to constant pressure source corresponding to the different choice of application scenarios or service condition or current source, further improved range of application of the present invention.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Embodiment mono-
Refer to Fig. 2, it is the system construction drawing of a kind of LED drive system of the present invention, and this system comprises switch element 201, charhing unit 202, driving power 203 and LED unit 204:
One end of described switch element 201 is connected with described LED unit 204, the other end is when receiving the control signal that continues Preset Time, in the described Preset Time that described control signal continued, be connected with charhing unit 202, when not receiving described control signal, disconnection is connected with described LED unit 204, and be connected with driving power 203, described Preset Time is relevant to preset charged voltage, and 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, for 204 chargings of described LED unit, described charhing unit 202 is the charging rate that the charging rate of described LED unit 204 chargings is 204 chargings of described LED unit faster than described driving power 203;
Described driving power 203, for when being connected with described switch element 201, for described LED unit 204 provides On current;
Preferably, described driving power is specially constant-current source.
Described LED unit 204, for starting normal operation after reaching conducting voltage.
Technical scheme of the present invention is the matrix form power drives LED display mode based on traditional, increases drive current and accelerates the realization of rising module.That is to say, after connecting with the mains for LED equipment, according to the display mode of different LED equipment or working method, start successively the LED unit in LED equipment to be charged so that it is luminous, the matrix LED unit square formation of the N*M shown in Fig. 2 of take describes as example, when taking turns to LED unit that wherein j is capable, carry out when luminous, to should receiving control signal with the switch element 201 that this row LED unit is connected in row LED unit, connect the LED unit that charhing unit 202 and j are capable, the same with traditional matrix form power drives LED, when effective for the capable control signal of j, the switching circuit gating of the ground connection of this row, now other row control signal is invalid, electric current only flows through the LED unit that j is capable.The connect hours of the LED unit that default connection charhing unit 202 is capable to j is relevant with the default charging voltage arranging, in general, can preset one and approach the magnitude of voltage of LED cell conduction voltage to add as much as possible the speed of charging quickly, preset charged voltage more approaches conducting voltage, and the default connect hours will be longer.When corresponding switch element 201 and 202 connect hours of charhing unit, reach after Preset Time, when in the LED unit that j is capable, the magnitude of voltage of electric capacity reaches preset charged voltage, corresponding switch element 201 is switched to and driving power 203 fast, the LED unit 204 that driving power 203 is capable with j is connected, by driving power 203, continuing as the LED unit 204 that j is capable carries out from preset charged voltage to the charging conducting voltage, until the capable LED unit 204 of j reach start after conducting voltage luminous, corresponding switch element 201 continues to connect driving powers 203 and the capable LED unit 204 of j until receive other control signals.That is to say, utilize technical scheme of the present invention, when accelerated charging to the both end voltage of the electric capacity in LED unit approaches LED conducting voltage, stop accelerating, the driving power that is switched to high accurancy and precision is proceeded remaining charging driving, the electric current of charge power supply can be injected into LED unit at once, and the output of the light of LED unit is directly proportional to the current amplitude of flowing through and duty ratio so.
Carrying out the charhing unit of accelerated charging, can be the mode with voltage, also can accelerate in the mode of electric current, will for the mode with voltage with the technical scheme that the mode of electric current is carried out accelerated charging, be described respectively below.
In the mode of voltage, when above-mentioned charhing unit 202 is specially a constant pressure source:
Preferably, described charhing unit is specially constant pressure source, and the output current of described constant pressure source is greater than the output current of described driving power;
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 charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after first preset time t 1 that is connected with described constant pressure source.
In general, the span of the output voltage of constant pressure source both can be less than the turn-on voltage of LED unit, also can be greater than the turn-on voltage of LED unit, can adjust according to the operating accuracy of actual working environment, the embodiment of the present invention provides a preferred span to the output voltage of constant pressure source, and the output voltage of described constant pressure source is to be less than and close to the forward conduction voltage of LED lamp.In the time of within the scope of this, even if the operating accuracy of actual working environment is not high, LED unit could not switch back driving power timely after use constant pressure source charges the first preset time t 1 in other words, and constant pressure source can be therefore not luminous by this LED unit drives yet, to user, causes bad experience.
The practical application scene of take is below carried out quick charge as example to the mode with voltage and is further detailed:
Usually, the conducting voltage red light of LED lamp in 1.6v to 2.6v scope, blue lamp and green light in 2.6v to 3.8v scope, select blue lamp 3.8v to calculate.In addition according to the application experience of industry, the about 10pf of 10milLED wafer junction capacitance, internal resistance R
l=560 left and right, Europe, n=16 16 sweeps LED display, V0=0, I
i=4mA; GTG PWM clock 30MHZ, a GTG cycle is 3.3*10
-8second.
The charging interval of first the traditional LED drive current of use of the prior art being charged is calculated as follows:
If constant-current source circuit I
i, the capacitor C of LED unit
l, LED conducting voltage V1.The electric capacity of LED unit need to be charged to LED conducting voltage V from initial voltage V0
f, electric current just starts to flow through from LED also controlled luminous.Because a line has n LED lamp, need to be to all parasitic capacitance chargings, i.e. nC
l.
The Time Calculation of this charging process is as follows:
U(t)=∫i(t)dt/nC
L
(V1-V0)=I
it/nC
L
t=(V1-V0)nC
L/I
i
Bring into after above-mentioned parameter:
T
i=(V1-V0) nC
l/ I
i=3.8*16*10*10
-12/ (4*10
-3)=15*10
-8second=150 nanoseconds
Using traditional LED drive current to charge needs the GTG time more than 4 electric capacity could be full of, the luminance that the LED unit that just can make to be recharged starts to enter controlled PWM.
Being calculated as follows of charging interval when LED unit being charged as charhing unit with constant pressure source:
t1=RC*Ln[(V1-V0)/(V1-Vt1)]
Suppose that preset charged voltage Vt1 is 9/10 of conducting voltage charging V1, and equal 0 due to what V0 was, so [(V1-V0)/(V1-Vt)]=10
The above-mentioned LED parameter of crystal sheets of take is equally example, the about 10pf of 10milLED wafer junction capacitance, internal resistance R
l=560 left and right, Europe.Charging interval t1 is:
T1=560*10*10
-12ln10=1.3*10
-8second
The time that residue 1/10 conducting 0 voltage range continues to charge to V1 by the driving power of LED unit is:
T
i=(V1/10) nC
l/ I
i=1.5*10
-8second
Total charging time: t=t1+t
i=2.8*10
-8second=28 nanoseconds
Visible, only need 1 the GTG time of less than electric capacity can be full of, the luminance that the LED unit that makes to be recharged starts to enter controlled PWM, the charging interval has had greatly and has promoted than traditional approach (150 nanosecond).
In the mode of electric current, when above-mentioned charhing unit 202 is specially a current source:
Preferably, described charhing unit is specially current source, and the output current of described current source is greater than the output current of described driving power;
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after second preset time t 2 that is connected with described current source;
V0 is the initial voltage value of described LED unit;
The number that n is the described LED unit that simultaneously charges;
C is the capacitance of described LED unit;
I is the output current of described current source.
The practical application scene of take is below carried out quick charge as example to the mode with voltage and is further detailed:
The same example that carries out quick charge in the mode of voltage that uses, that is:
Usually, the conducting voltage red light of LED lamp in 1.6v to 2.6v scope, blue lamp and green light in 2.6v to 3.8v scope, select blue lamp 3.8v to calculate.In addition according to the application experience of industry, the about 10pf of 10milLED wafer junction capacitance, internal resistance R
l=560 left and right, Europe, n=16 16 sweeps LED display, V
0=0, I
i=4mA; GTG PWM clock 30MHZ, a GTG cycle is 3.3*10
-8second.
The charging interval of using traditional LED drive current to charge was 150 nanoseconds.
Being calculated as follows of charging interval when LED unit being charged as charhing unit with current source:
t2=(Vt2-V0)nC/I
Still use above-mentioned LED calculation of parameter, the drive current I that the output current I that supposes the described current source chosen is described driving power
i(40mA) 10 times are carried out quick charge, still charge to the 9/10 rear end quick charge of the conducting voltage V1 of described LED unit.
T2=(9V
f/ 10) nC
l/ (10I
ithe * of)=(3.8*9/10) 16*10*10
-12/ (10*4*10
-3)=13 nanosecond
Next switch to driving power, with the output current I of driving power
sthe time that charges to V1 is:
T
i=(V
f/ 10) nC
l/ I
i=(3.8*1/10) * 16*10*10
-12/ (4*10
-3)=15 nanosecond
Total charging time: t=t2+t
i=28 nanoseconds
Visible, only need the time of 1 GTG of less than electric capacity can be full of, the luminance that the LED unit that makes to be recharged starts to enter controlled PWM, the charging interval has had greatly and has promoted than traditional approach (150 nanosecond).
The embodiment of the present invention can also further show by the mode of linear schedule, and as shown in Figure 3, it is LED of the present invention unit charging interval schematic diagram, and transverse axis coordinate is wherein the time:
301 is the charging interval under perfect condition, low level is non operating state, and high level is luminous operating state after conducting, and A time point is that this LED unit of default starts luminous time point, under perfect condition, be in LED unit electric capacity moment be full of, start working luminous.
302 is control signal, in the A time, point out, according to the setting of system, the control signal that continues Preset Time is sent, and the circuit of controlling this place, LED unit is communicated with, and starts to accept electric current input, the duration Duan Weicong A time point of this Preset Time is to B time point, the position of B time point is relevant to preset charged voltage, the conducting voltage the closer to LED unit that preset charged voltage arranges, and B time point distance C time point is nearer.
303 is the charging interval under accelerated charging of the present invention, low level is non operating state, high level is luminous operating state after conducting, visible, the A time point sending from control signal is the time of using the quick charge technical solution of the present invention to the time period AB that is about to start luminous B time point, the lasting Preset Time of described control signal namely, C time point is that conducting starts luminous time point, and time period BC proceeds charging until the charging interval of conducting after using technical solution of the present invention to switch back driving power.
304 is the charging interval of charging under prior art, low level is non operating state, high level is luminous operating state after conducting, visible, the A time point sending from control signal is longer than the AB+BC 303 far away to the time period AD starting the D time point of luminous operating state, need to consume the more time just can complete the charging to this LED unit.
By the present embodiment, can be found out, on the one hand, when driving LED is luminous, first by use, have than the higher charhing unit of the output current of the constant-current source that is just usually used in driving LED unit is wherein charged, when charging to, be switched to the constant-current source that is just usually used in driving LED unit while approaching LED forward conduction voltage and continue charging until conducting LED unit reaches the effect to the quick charge of LED unit thus.
On the other hand, can as charhing unit, be that LED unit carries out quick charge according to constant pressure source corresponding to the different choice of application scenarios or service condition or current source, further improved range of application of the present invention.
Embodiment bis-
Corresponding with above-mentioned a kind of LED drive system, the embodiment of the present invention also provides a kind of LED driving method.Refer to Fig. 4, it comprises for the method flow diagram of a kind of LED driving method of the present invention, the method:
S401: when switch element receives the control signal that continues Preset Time, be communicated with LED unit and charhing unit in the described Preset Time that described control signal continued;
S402: described charhing unit, when being connected with described switch element, is the charging of described LED unit, described charhing unit is that the charging rate of described LED unit charging is the charging rate of described LED unit charging faster than described driving power;
S403: when not receiving described control signal, described switch element disconnects the connection of described LED unit and described charhing unit, and be communicated with described LED unit and driving power, wherein, described Preset Time is relevant to preset charged voltage, and described preset charged voltage is less than the conducting voltage of described LED unit;
S404: described driving power is when being connected with described switch element, for described LED unit provides On current;
S405: described LED unit starts normal operation after reaching conducting voltage.
Wherein, preferred, described charhing unit is specially constant pressure source, and the output current of described constant pressure source is greater than the output current of described driving power;
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 charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after first preset time t 1 that is connected with described constant pressure source.
Preferably, the output voltage of described constant pressure source is to be less than and close to the forward conduction voltage of LED lamp.Preferably, described charhing unit is specially current source, and the output current of described current source is greater than the output current of described driving power;
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after second preset time t 2 that is connected with described current source;
V0 is the initial voltage value of described LED unit;
The number that n is the described LED unit that simultaneously charges;
C is the capacitance of described LED unit;
I is the output current of described current source.
Preferably,
Described driving power is specially constant-current source.
As can be seen from the above-described embodiment, on the one hand, when driving LED is luminous, first by use, have than the higher charhing unit of the output current of the constant-current source that is just usually used in driving LED unit is wherein charged, when charging to, be switched to the constant-current source that is just usually used in driving LED unit while approaching LED forward conduction voltage and continue charging until conducting LED unit reaches the effect to the quick charge of LED unit thus.
On the other hand, can as charhing unit, be that LED unit carries out quick charge according to constant pressure source corresponding to the different choice of application scenarios or service condition or current source, further improved range of application of the present invention.
It should be noted that, one of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, to come the hardware that instruction is relevant to complete by computer program, described program can be stored in a computer read/write memory medium, this program, when carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-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, applied specific embodiment herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. a LED drive system, is characterized in that, comprises switch element, charhing unit, driving power and LED unit:
One end of described switch element is connected with described LED unit, the other end is when receiving the control signal that continues Preset Time, in the described Preset Time that described control signal continued, be connected with charhing unit, when not receiving described control signal, disconnection is connected with described LED unit, and be connected with driving power, described Preset Time is relevant to preset charged voltage, and described preset charged voltage is less than the conducting voltage of described LED unit;
Described charhing unit, for when being connected with described switch element, is the charging of described LED unit, and described charhing unit is that the charging rate of described LED unit charging is the charging rate of described LED unit charging faster than described driving power;
Described driving power, for when being connected with described switch element, for described LED unit provides On current;
Described LED unit, for starting normal operation after connecting On current.
2. system according to claim 1, is characterized in that, described charhing unit is specially constant pressure source, and the output current of described constant pressure source is greater than the output current of described driving power;
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 charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after first preset time t 1 that is connected with described constant pressure source.
3. system according to claim 2, is characterized in that,
The output voltage of described constant pressure source is to be less than and close to the forward conduction voltage of LED lamp.
4. system according to claim 1, is characterized in that, described charhing unit is specially current source, and the output current of described current source is greater than the output current of described driving power;
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after second preset time t 2 that is connected with described current source;
V0 is the initial voltage value of described LED unit;
The number that n is the described LED unit that simultaneously charges;
C is the capacitance of described LED unit;
I is the output current of described current source.
5. system according to claim 1, is characterized in that,
Described driving power is specially constant-current source.
6. a LED driving method, is characterized in that, comprising:
When switch element receives the control signal that continues Preset Time, in the described Preset Time that described control signal continued, be communicated with LED unit and charhing unit;
Described charhing unit, when being connected with described switch element, is the charging of described LED unit, and described charhing unit is that the charging rate of described LED unit charging is the charging rate of described LED unit charging faster than described driving power;
When not receiving described control signal,, described switch element disconnects the connection of described LED unit and described charhing unit, and be communicated with described LED unit and driving power, wherein, described Preset Time is relevant to preset charged voltage, and described preset charged voltage is less than the conducting voltage of described LED unit;
Described driving power is when being connected with described switch element, for described LED unit provides On current;
Described LED unit starts normal operation after reaching conducting voltage.
7. method according to claim 6, is characterized in that, described charhing unit is specially constant pressure source, and the output current of described constant pressure source is greater than the output current of described driving power;
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 charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after first preset time t 1 that is connected with described constant pressure source.
8. method according to claim 6, is characterized in that,
The output voltage of described constant pressure source is to be less than and close to the forward conduction voltage of LED lamp.
9. method according to claim 6, is characterized in that, described charhing unit is specially current source, and the output current of described current source is greater than the output current of described driving power;
Accordingly, described Preset Time is specially the second preset time t 2:
t2=(Vt2-V0)nC/I
Wherein:
Vt2 is the preset charged voltage of described LED unit, the magnitude of voltage that described LED unit reaches after second preset time t 2 that is connected with described current source;
V0 is the initial voltage value of described LED unit;
The number that n is the described LED unit that simultaneously charges;
C is the capacitance of described LED unit;
I is the output current of described current source.
10. method according to claim 6, is characterized in that,
Described driving power is specially constant-current source.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110867931A (en) * | 2019-12-09 | 2020-03-06 | Oppo广东移动通信有限公司 | Wireless charging module, wireless charging table and wireless charging method |
| TWI774332B (en) * | 2020-04-29 | 2022-08-11 | 聯詠科技股份有限公司 | Display device and driver thereof |
| CN115206227A (en) * | 2022-05-18 | 2022-10-18 | 惠科股份有限公司 | Driving circuit of pixel unit and display panel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020169575A1 (en) * | 2001-05-09 | 2002-11-14 | James Everitt | Matrix element voltage sensing for precharge |
| TW511067B (en) * | 2000-09-28 | 2002-11-21 | Nec Corp | Organic EL display device and method for driving the same |
| 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 |
| CN1804979A (en) * | 2006-01-24 | 2006-07-19 | 广辉电子股份有限公司 | Active matrix organic LED display and its driving method |
| CN101320543A (en) * | 2007-06-07 | 2008-12-10 | 霍尼韦尔国际公司 | Hybrid driver for led display device |
-
2013
- 2013-12-02 CN CN201310635026.9A patent/CN103596344B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW511067B (en) * | 2000-09-28 | 2002-11-21 | Nec Corp | Organic EL display device and method for driving the same |
| US20020169575A1 (en) * | 2001-05-09 | 2002-11-14 | James Everitt | Matrix element voltage sensing for precharge |
| 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 |
| CN1804979A (en) * | 2006-01-24 | 2006-07-19 | 广辉电子股份有限公司 | Active matrix organic LED display and its driving method |
| CN101320543A (en) * | 2007-06-07 | 2008-12-10 | 霍尼韦尔国际公司 | Hybrid driver for led display device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2018072312A1 (en) * | 2016-10-19 | 2018-04-26 | 深圳市华星光电技术有限公司 | Compensation circuit and organic light-emitting diode display |
| US10109236B2 (en) | 2016-10-19 | 2018-10-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Compensation circuit and organic light emitting diode display device |
| CN110867931A (en) * | 2019-12-09 | 2020-03-06 | Oppo广东移动通信有限公司 | Wireless charging module, wireless charging table and wireless charging method |
| 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 |
| TWI774332B (en) * | 2020-04-29 | 2022-08-11 | 聯詠科技股份有限公司 | Display device and driver thereof |
| TWI802448B (en) * | 2020-04-29 | 2023-05-11 | 聯詠科技股份有限公司 | Display device and driver thereof |
| CN115206227A (en) * | 2022-05-18 | 2022-10-18 | 惠科股份有限公司 | Driving circuit of pixel unit and display panel |
| WO2023221498A1 (en) * | 2022-05-18 | 2023-11-23 | 惠科股份有限公司 | Drive circuit for pixel unit, and display panel |
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