CN103379702A - Light emitting diode driving circuit, light emitting diode driving device and drive method - Google Patents
Light emitting diode driving circuit, light emitting diode driving device and drive method Download PDFInfo
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- CN103379702A CN103379702A CN2012101295881A CN201210129588A CN103379702A CN 103379702 A CN103379702 A CN 103379702A CN 2012101295881 A CN2012101295881 A CN 2012101295881A CN 201210129588 A CN201210129588 A CN 201210129588A CN 103379702 A CN103379702 A CN 103379702A
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Abstract
Provided are a light emitting diode driving circuit, a light emitting diode driving device and a drive method. The light emitting diode driving circuit is matched with a light emitting diode module, and comprises a reading address generating unit, a memory unit and a drive unit. The reading address generating unit receives a pulse signal and outputs a reading signal. The memory unit is in coupling with the reading address generating unit and generates an output signal according to the reading signal. The drive unit is in coupling with the memory unit, receives the output signal and the pulse signal, and outputs a drive signal to the light emitting diode module. According to the light emitting diode driving circuit, the light emitting diode driving device and the drive method, unnecessary power losses can be reduced, and processing efficiency is improved.
Description
Technical field
The present invention is about a kind of LED driving circuit, light emitting diode drive device and driving method.
Background technology
Because light-emitting diode (Light Emitting Diode, LED) has higher photoelectric conversion efficiency, and its operational stability is high and can pass through pulse wave width modulation (Pulse Width Modulation, PWM) mode is carried out brilliance control (also can be described as GTG control), thereby be applied in the light source or display module of many electronic installations, for example: the image pixel of the backlight module of display unit, lighting device, advertising billboard or large-scale display device.
Please refer to Figure 1A, it is known LED driving circuit 1.LED driving circuit 1 has a data buffer storage unit 11, a counter 12, a comparator 13 and a driver 14.Data buffer storage unit 11 receives and stores from the system end gray level information of (figure does not show).The pulse signal that counter 12 receiving system ends are exported.The first end 131 of comparator 13 couples with data buffer storage unit 11, and the second end 132 of comparator 13 couples with counter 12, and first end 131 and the second end 132 signal exported of receive data buffer unit 11 and counter 12 respectively.Comparator 13 compares for the signal that first end 131 and the second end 132 receive, during signal that the signal that receives when first end 131 receives greater than the second end 132, the output of comparator 13 will present the high potential of logic, thereby make driver 14 light light-emitting diode in the mode of a constant current source (Constant Current Source).During signal that the signal that receives when the second end 132 receives greater than first end 131, the output of comparator 13 will present the electronegative potential of logic, and in this simultaneously, driver 14 will not lighted light-emitting diode.Therefore, as shown in Figure 1B, see through the comparative result of comparator 13, driver 14 will be exported a pulse wave width modulation signal, so that light-emitting diode produces the brightness of different GTGs (gray scale), and the conducting period T of aforesaid pulse wave width modulation signal in a work period T
1, be a continuous conducting period.Wherein, GTG is the bright-dark degree of brightness, and known LED driving circuit 1 sees through the pulse wave width modulation signal that driver 14 is exported, so that light-emitting diode sends different brightness.As conducting period T
1Longer, it is more of a specified duration to represent the time that light-emitting diode is lit, and then brighter display is opposite, as conducting period T
1Shorter, then brightness is darker, as conducting period T
1When being zero, then representing light-emitting diode and extinguish.
Yet, the comparator 13 of known LED driving circuit 1 is in order to compare the signal from data buffer storage unit 11 and counter 12, it is made of a large amount of metal oxide semiconductcor field effect transistor (MOSFET), for example when comparator 13 is the comparator of use one 12 (bit), have at least 864 metal oxide semiconductcor field effect transistors in the comparator 13.Because there is the defective of leakage current and parasitic capacitance in metal oxide semiconductcor field effect transistor itself, thereby use the comparator 13 of a large amount of metal oxide semiconductcor field effect transistors to have the problem of extra power loss.
Therefore, how to provide a kind of LED driving circuit, light emitting diode drive device and driving method, can reduce the unnecessary loss of power, and promote its treatment efficiency, become one of important topic.
Summary of the invention
Purpose of the present invention can reduce the unnecessary loss of power for providing a kind of, and promotes LED driving circuit, light emitting diode drive device and the driving method for the treatment of efficiency.
The present invention can realize by the following technical solutions.
A kind of LED driving circuit of the present invention cooperates with a light-emitting diode (LED) module.LED driving circuit comprises a reading address generation unit, an internal storage location and a driver element.The reading address generation unit receives a pulse signal and exports a read signal.Internal storage location and reading address generation unit couple, and produce an output signal according to read signal.Driver element and internal storage location couple, and receive output signal and pulse signal, and output one drives signal to light-emitting diode (LED) module.
In one embodiment of this invention, pulse signal is a binary weights pulse signal.
In one embodiment of this invention, the reading address generation unit comprises a reading address counter and a reading address decoder.Reading address counter return pulse signal.Reading address decoder and reading address counter couple, and the output read signal.
In one embodiment of this invention, drive signal and in a work period, have a plurality of conducting period, and the described conducting period is discontinuous.
In one embodiment of this invention, driver element comprises a flip-flop and a driver.Flip-flop and internal storage location couple, and receive output signal and pulse signal.Driver is connected with flip-flop and output drive signal.
In one embodiment of this invention, internal storage location is a dual-port static random access memory.
In one embodiment of this invention, LED driving circuit also comprises a writing address generation unit and an offset buffer.Writing address generation unit and internal storage location couple, and export a write signal to internal storage location according to a bolt-lock enable signal.Offset buffer and internal storage location couple.
In one embodiment of this invention, the writing address generation unit comprises a write address counter and a writing address decoder.Write address counter receives the bolt-lock enable signal.Writing address decoder and write address counter couple, and the output write signal.
The present invention can realize by the following technical solutions.
The driving method of a kind of light-emitting diode (LED) module that the present invention complies with, it cooperates with a LED driving circuit, and LED driving circuit has a reading address generation unit, an internal storage location and a driver element.Driving method comprises: the reading address generation unit receives a pulse signal, and exports a read signal to internal storage location; Internal storage location produces an output signal according to read signal; And driver element reception output signal and pulse signal, and export a driving signal to light-emitting diode (LED) module.
In one embodiment of this invention, pulse signal is a binary weights pulse signal.
In one embodiment of this invention, driving method also comprises: export a write signal to internal storage location by a writing address generation unit according to a bolt-lock enable signal.
The present invention can realize by the following technical solutions.
A kind of light emitting diode drive device that the present invention complies with cooperates with a plurality of light-emitting diode (LED) modules.Light emitting diode drive device comprises a plurality of internal storage locations, a writing address generation unit, a reading address generation unit and a plurality of driver element.Internal storage location is for coupling side by side.The writing address generation unit produces a write signal according to a bolt-lock enable signal.The reading address generation unit receives a pulse signal and exports a read signal to each internal storage location.Driver element couples with corresponding internal storage location respectively.One of them of described internal storage location writes a GTG signal according to write signal.Each internal storage location outputs signal to corresponding driver element according to read signal output one.Each driver element is according to output signal and pulse signal, and output one drives signal to corresponding light-emitting diode (LED) module.
In one embodiment of this invention, pulse signal is a binary weights pulse signal.
In one embodiment of this invention, the reading address generation unit comprises a reading address counter and a reading address decoder.Reading address counter return pulse signal.Reading address decoder and reading address counter couple, and the output read signal.
In one embodiment of this invention, drive signal and in a work period, have a plurality of conducting period, and the described conducting period is discontinuous.
In one embodiment of this invention, each driver element comprises a flip-flop and a driver.Flip-flop couples with corresponding internal storage location, and receives output signal and pulse signal.Driver is connected with flip-flop and output drive signal.
In one embodiment of this invention, internal storage location is a dual-port static random access memory.
In one embodiment of this invention, the writing address generation unit comprises a write address counter and a writing address decoder.Write address counter receives the bolt-lock enable signal.Writing address decoder and write address counter couple, and the output write signal.
The present invention can realize by the following technical solutions.
The driving method of a kind of light-emitting diode (LED) module that the present invention complies with cooperates with a light emitting diode drive device.Light emitting diode drive device has a plurality of internal storage locations, a writing address generation unit, a reading address generation unit and a plurality of driver element.Driving method comprises: the reading address generation unit receives a pulse signal and exports a read signal to each internal storage location; Each internal storage location outputs signal to corresponding driver element according to read signal output one; And each driver element is exported one and is driven signal to corresponding light-emitting diode (LED) module according to output signal and pulse signal.
In one embodiment of this invention, driving method also comprises: the writing address generation unit produces a write signal according to a bolt-lock enable signal; And one of them of described internal storage location writes a GTG signal according to write signal.
From the above, because the read signal of exporting according to the reading address generation unit by internal storage location according to a kind of LED driving circuit of the present invention, light emitting diode drive device and driving method produces output signal, and make driver element drive light-emitting diode (LED) module according to output signal and pulse signal, thereby realize reducing the unnecessary loss of power, and promote treatment efficiency.
Description of drawings
Figure 1A is a kind of schematic diagram of known LED driving circuit;
Figure 1B is the oscillogram of the pulse wave width modulation signal exported of a kind of known LED driving circuit;
Fig. 2 A is the schematic diagram according to a kind of LED driving circuit of the preferred embodiment of the present invention;
Fig. 2 B is the oscillogram according to the pulse signal of the preferred embodiment of the present invention and driving signal;
Fig. 3 is according to the schematic diagram of the present invention according to a kind of LED driving circuit of the preferred embodiment of the present invention;
Fig. 4 is the flow chart according to the driving method of a kind of light-emitting diode (LED) module of the preferred embodiment of the present invention;
Fig. 5 is the schematic diagram according to a kind of light emitting diode drive device of the preferred embodiment of the present invention; And
Fig. 6 is the flow chart according to the driving method of a kind of light-emitting diode (LED) module of the preferred embodiment of the present invention.
The main element symbol description:
1,2: LED driving circuit
11: the data buffer unit
12: counter
13: comparator
131: first end
132: the second ends
14,232,342: driver
21,33: the reading address generation unit
211,331: the reading address counter
212,332: the reading address decoder
22,31: internal storage location
23,34: driver element
231,341: flip-flop
24,32: the writing address generation unit
241,321: write address counter
242,322: the writing address decoder
25,35: offset buffer
3: light emitting diode drive device
L: light-emitting diode (LED) module
S01～S03, S11～S13: the step of driving method
S1, S7: pulse signal
S2: read signal
S3: output signal
S4: drive signal
S5: bolt-lock enable signal
S6: write signal
S8: input signal
S9: GTG signal
T: work period
T
1: the conducting period
Embodiment
Hereinafter with reference to relevant drawings, a kind of LED driving circuit, light emitting diode drive device and driving method according to the preferred embodiment of the present invention are described, wherein identical element will be illustrated with identical component symbol.
At first, please refer to Fig. 2 A, it is a kind of LED driving circuit 2 according to the preferred embodiment of the present invention.LED driving circuit 2 is to use with light-emitting diode (LED) module L collocation.Wherein, LED driving circuit 2 comprises a reading address generation unit 21, an internal storage location 22 and a driver element 23.Light-emitting diode (LED) module L comprises at least one light-emitting diode, in what this need specify be, light-emitting diode (LED) module L is when practice, can be according to the demand of using or the consideration of design, and have the light-emitting diode of varying number, and the connected mode between the light-emitting diode can change according to demand.
Reading address generation unit 21 receives from the system end one pulse signal S1 of (figure does not show), and counts according to pulse signal S1, and exports a read signal S2, and read signal S2 is a signal that reads certain bits in order to appointment.Wherein, aforesaid system end for example is a pulse wave signal generator that uses with LED driving circuit 2 collocation, and it can be arranged in another circuit or another device.
In the present embodiment, pulse signal S1 is a binary weights (binary weighted) pulse signal, that is, shown in Fig. 2 B, each pulse wave of pulse signal S1 is take the time width of first previous pulse wave as benchmark, and generated in binary mode, for example the width of first pulse wave is 2
0, and the width of second pulse wave is 2
1, the width of the 3rd pulse wave is 2
2, following pulse wave is sequentially multiplication then.Wherein, the width of pulse wave will continue doubly to increase to the counting upper limit of reading address generation unit 21, and for example when the count range of reading address generation unit 21 was 0 to 11, the width of pulse wave was doubly increasing to 2
11After, will be returned to pulse bandwidth is 2
0, then aforesaid mode sequentially doubles for another example.
On the implementation, driving signal S4 is a pulse wave width modulation signal, and the light-emitting diode (LED) module L brightness that produces different GTGs according to the conducting period that drives signal S4.Wherein, in a work period, the conducting period that drives signal S4 can be a continuous conducting period, or shown in Fig. 2 B, drives signal S4 and have a plurality of conducting period T in work period T
1, and ought in work period T, have a plurality of conducting period T by driving signal S4
1The time, aforesaid conducting period T
1Can be discrete state.Therefore, driver element 23 is according to the GTG brightness that will present, but and export the driving signal S4 of the width of modulation conducting period, and in a work period, the conducting period that drives signal S4 can be a continuous conducting period, or a plurality of discontinuous conducting period.
By above-mentioned framework, LED driving circuit 2 is avoided using the comparator that is made of a large amount of metal oxide semiconductcor field effect transistors, thereby improves the unnecessary power dissipation in the circuit, and promotes the overall efficiency of circuit.What need special instruction is that when internal storage location 22 was one 12 dual-port static random access internal memory, it only had 96 metal oxide semiconductcor field effect transistors.Therefore, LED driving circuit 2 not only can reduce the unnecessary loss of power, and carrying out under the condition of identical driving function with known LED driving circuit 1 (shown in Figure 1A), also can reduce the employed area of circuit layout (layout).
Then, please refer to shown in Figure 3, to further specify LED driving circuit 2 of the present invention.In the present embodiment, reading address generation unit 21 comprises a reading address counter 211 and a reading address decoder 212.The pulse signal S1 that reading address counter 211 receiving system ends (figure show) provide, and count and export its result according to pulse signal S1.Reading address decoder 212 couples with reading address counter 211, and produces read signal S2 according to the result that reading address counter 211 is exported.
In addition, LED driving circuit 2 also comprises a writing address generation unit 24 and an offset buffer 25.Writing address generation unit 24 couples with internal storage location 22, and has a write address counter 241 and a writing address decoder 242.Wherein, the bolt-lock enable signal S5 that write address counter 241 receiving system ends (figure does not show) provide, and count.Writing address decoder 242 couples with write address counter 241, and produces a write signal S6 according to the output of write address counter 241.Writing address decoder 242 is sent to internal storage location 22 with write signal S6.Offset buffer 25 couples with internal storage location 22, and receives a pulse signal S7 and an input signal S8, and provides a GTG signal S9 to internal storage location 22.Internal storage location 22 writes specific address according to write signal S6 with GTG signal S9.Wherein, the pulse signal S7 that offset buffer 25 receives stems from the not identical pulse wave signal generator of pulse signal S1 that receives with driver element 23 and reading address generation unit 21, thereby pulse signal S7 and pulse signal S1 have diverse waveform.In addition, input signal S8 is the signal of representative gray level information, and identical in essence with GTG signal S9.
It is worth mentioning that in the present embodiment, internal storage location 22 is a dual-port static random access memory, and internal storage location 22 input port that is connected to offset buffer 25 only allows the function that writes.In addition, write in data fashionable, be mode with transmission arranged side by side with data write memory unit 22, when reading out data, then be to read a specific single position.Therefore, internal storage location 22 can read the data of same address simultaneously in the data during writing, and after need not waiting pending data to write to finish, the action of just reading.In other words, with writing and read the data of same address, need not wait for when internal storage location 22 can allow two different pulse signal systems, thereby reduce the complexity of circuit.
Then, please refer to the flow chart of Fig. 4 and arrange in pairs or groups Fig. 2 A, Fig. 2 B and Fig. 3, the driving method of light-emitting diode (LED) module with explanation the preferred embodiments of the present invention, it can use with above-mentioned LED driving circuit 2 and light-emitting diode (LED) module L collocation, and the step of driving method comprises step S01～step S03.
Step S01 receives a pulse signal S1 by reading address generation unit 21, and exports a read signal S2 to internal storage location 22.In the present embodiment, reading address generation unit 21 receives from system end, for example be the pulse signal S1 that produces of a pulse wave signal generator counting, thereby output read signal S2 is to internal storage location 22.Aforesaid pulse signal S1 is a binary weights pulse signal, that is, each pulse wave of pulse signal S1 is take the time width of first previous pulse wave as benchmark, and generated in binary mode, and the width of pulse wave will continue doubly to increase to the counting upper limit of reading address generation unit 21, be returned to initial value again.
Step S02 produces an output signal S3 by internal storage location 22 according to read signal S2.In the present embodiment, internal storage location 22 is chosen the signal of corresponding certain bits according to read signal S2, and exports an output signal S3, and output signal S3 represents a GTG signal.Wherein, internal storage location 22 is a dual-port static random access memory.
Step S03 receives output signal S3 and pulse signal S1 by driver element 23, and exports a driving signal S4 to light-emitting diode (LED) module L.In the present embodiment, the pulse signal S1 that the output signal S3 that driver element 23 reception internal storage locations 22 are exported and system end provide, thus output drive signal S4 is to light-emitting diode (LED) module L.Wherein, driving signal S4 is a pulse wave width modulation signal, and on the implementation, in a work period, the conducting period that drives signal S4 can be a continuous conducting period, or a plurality of discontinuous conducting period.
Because in a work period, if when the summation of discontinuous conducting period equaled the summation of continuous conducting period, the brightness of human eyes institute perception was identical.Therefore, by above-mentioned driving method, the present invention can see through modulation, and to drive signal S4 be discrete conducting period or continuous conducting period, with the control of the GTG of reaching light-emitting diode (LED) module L.
In addition, driving method also comprises: export a write signal S6 to internal storage location 22 by writing address generation unit 24 according to a bolt-lock enable signal S5.In the present embodiment, the bolt-lock enable signal S5 that writing address generation unit 24 receiving system ends provide is counting, thereby output write signal S6 is to internal storage location 22, so that internal storage location 22 writes the GTG signal S9 from offset buffer 25.Wherein, aforesaid system end for example is a signal generator that uses with LED driving circuit 2 collocation.
Then, please refer to Fig. 5, it is a kind of light emitting diode drive device 3 according to the preferred embodiment of the present invention.Light emitting diode drive device 3 cooperates with a plurality of light-emitting diode (LED) module L.Light emitting diode drive device 3 comprises a plurality of internal storage locations 31, a writing address generation unit 32, a reading address generation unit 33 and a plurality of driver element 34.
Writing address generation unit 32 produces a write signal S6 according to the bolt-lock enable signal S5 that system end provides.Wherein, writing address generation unit 32 has a write address counter 321 and a writing address decoder 322.Write address counter 321 is one 4 write address counter, advances the 16 writing address decoders that go out and writing address decoder 322 is one 4.Write address counter 321 is counted according to bolt-lock enable signal S5, produces write signal S6 via writing address decoder 322, GTG signal S9 is write one of them of 16 internal storage locations 31.In other words, the internal storage location 31 of write signal S6 in order to specify GTG signal S9 to write.
The pulse signal S1 that reading address generation unit 33 receiving system ends provide also exports a read signal S2 to each internal storage location 31.In the present embodiment, reading address generation unit 33 comprises a reading address counter 331 and a reading address decoder 332.Reading address counter 331 is one 4 reading address counter, advances the 12 reading address decoders that go out and reading address decoder 332 is one 4.The pulse signal S1 that system end provides is in order to drive reading address counter 331, and reading address decoder 332 receives the output of reading address counter 331, so as to choosing the position of a certain appointment, to export read signal S2 to all internal storage locations 31.
Aforesaid pulse signal S1 is a binary weights pulse signal, each pulse wave of pulse signal S1 is take the time width of first previous pulse wave as benchmark, and generated in binary mode, and the width of pulse wave will continue doubly to increase to the counting upper limit of reading address counter 331, be returned to initial value again.
Each driver element 34 comprises respectively a flip-flop 341 and a driver 342.Each flip-flop 341 couples with corresponding internal storage location 31 respectively, and receives output signal S3 and pulse signal S1.Wherein, the pulse signal S1 that receives of the pulse signal S1 that receives of driver element 34 and reading address generation unit 33 stems from same pulse wave signal generator.Driver 342 is connected with flip-flop 341, and with the mode output drive signal S4 of constant current source to the light-emitting diode (LED) module L that is connected.Wherein, driving signal S4 is a pulse wave width modulation signal, and on the implementation, in a work period, the conducting period that drives signal S4 can be a continuous conducting period, or a plurality of discontinuous conducting period.
In addition, light emitting diode drive device 3 also has an offset buffer 35, and itself and each internal storage location 31 couple, and receives a pulse signal S7 and an input signal S8, and provides a GTG signal S9 to each internal storage location 31.Wherein, the pulse signal S7 that offset buffer 35 receives stems from the not identical pulse wave signal generator of pulse signal S1 that receives with driver element 34 and reading address generation unit 33, thereby pulse signal S7 and pulse signal S1 have diverse waveform.In addition, input signal S8 is the signal of representative gray level information, and identical in essence with GTG signal S9.
In the present embodiment, each internal storage location 31 input port of being connected to offset buffer 35 only allows the function that writes.In addition, write fashionablely in data, be that the mode with transmission arranged side by side writes one of them internal storage location 31 with data, and when reading out data, then be to read a specific single position.Therefore, internal storage location 31 can read the data of same address simultaneously in the data during writing, and after need not waiting pending data to write to finish, the action of just reading.In other words, with writing and read the data of same address, need not wait for when each internal storage location 31 can allow two different pulse signal systems, thereby reduce the complexity of circuit.
It is worth mentioning that, when the internal storage location 31 that adopts specification as mentioned above, write address counter 321, writing address decoder 322, reading address counter 331 and reading address decoder 332, under the condition that will produce 4096 GTGs, aforesaid assembly has comprised about 2000 metal oxide semiconductcor field effect transistors altogether.Yet, if use known LED driving circuit 1, under the condition that will produce 4096 GTGs, need use at least 17000 metal oxide semiconductcor field effect transistors.Therefore, light emitting diode drive device 3 of the present invention has reduced the use of metal oxide semiconductcor field effect transistor, thereby reduces the unnecessary loss of power, and so that lattice dimensions (die size) is obviously dwindled, and effectively reduces the volume of device.
Then, please refer to the flow chart of Fig. 6 and the Fig. 5 that arranges in pairs or groups, the driving method of light-emitting diode (LED) module with explanation the preferred embodiments of the present invention, it can use with above-mentioned light emitting diode drive device 3 and a plurality of light-emitting diode (LED) module L collocation, and the step of driving method comprises step S11～step S13.
Step S11 is received a pulse signal S1 and is exported a read signal S2 to each internal storage location 31 by reading address generation unit 33.In the present embodiment, the pulse signal S1 that provides of system end drive reading address generation unit 33 with output read signal S2 to all internal storage locations 31.Wherein, pulse signal S1 is a binary weights pulse signal.
Step S12 exports an output signal S3 to corresponding driver element 34 by each internal storage location 31 according to read signal S2.In the present embodiment, all internal storage locations 31 will be chosen according to read signal S2 the signal of corresponding certain bits, and produce output signal S3.Wherein, internal storage location 31 is a dual-port static random access memory.
According to output signal S3 and pulse signal S1, output one drives signal S4 to corresponding light-emitting diode (LED) module L to step S13 by each driver element 34.In the present embodiment, driver element 34 receives output signal S3 and pulse signal S1, thus output drive signal S4 to corresponding light-emitting diode (LED) module L, and light-emitting diode (LED) module L produces corresponding GTG brightness according to the conducting period that drives signal S4.In addition, driving method also comprises: writing address generation unit 32 produces a write signal S6 according to a bolt-lock enable signal S5; And one of them of internal storage location 31 writes a GTG signal S9 according to write signal S6.
In sum, because the read signal of exporting according to the reading address generation unit by internal storage location according to a kind of LED driving circuit of the present invention, light emitting diode drive device and driving method produces output signal, and make driver element drive light-emitting diode (LED) module according to output signal and pulse signal, thereby realize reducing the unnecessary loss of power, and promote treatment efficiency.
The above only is illustrative, and non-limiting.Anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be included in the claim limited range.
Claims (20)
1. LED driving circuit, it cooperates with a light-emitting diode (LED) module, it is characterized in that, comprising:
One reading address generation unit receives a pulse signal and exports a read signal;
One internal storage location couples with described reading address generation unit, and produces an output signal according to described read signal; And
One driver element couples with described internal storage location, and receives described output signal and described pulse signal, and output one drives signal to described light-emitting diode (LED) module.
2. LED driving circuit according to claim 1 is characterized in that, described pulse signal is a binary weights pulse signal.
3. LED driving circuit according to claim 1 is characterized in that, described reading address generation unit comprises:
One reading address counter receives described pulse signal; And
One reading address decoder couples with described reading address counter, and exports described read signal.
4. LED driving circuit according to claim 1 is characterized in that, described driving signal had a plurality of conducting period in a work period, and the described conducting period is discontinuous.
5. LED driving circuit according to claim 1 is characterized in that, described driver element comprises:
One flip-flop couples with described internal storage location, and receives described output signal and described pulse signal; And
One driver is connected with described flip-flop and exports described driving signal.
6. LED driving circuit according to claim 1 is characterized in that, described internal storage location is a dual-port static random access memory.
7. LED driving circuit according to claim 1 is characterized in that, also comprises:
One writing address generation unit couples with described internal storage location, and exports a write signal to described internal storage location according to a bolt-lock enable signal; And
One offset buffer couples with described internal storage location.
8. LED driving circuit according to claim 7 is characterized in that, the said write address-generation unit comprises:
One write address counter receives described bolt-lock enable signal; And
One writing address decoder couples with the said write address counter, and output said write signal.
9. the driving method of a light-emitting diode (LED) module, it cooperates with a LED driving circuit, and described LED driving circuit has a reading address generation unit, an internal storage location and a driver element, it is characterized in that, and described driving method comprises:
Described reading address generation unit receives a pulse signal, and exports a read signal to described internal storage location;
Described internal storage location produces an output signal according to described read signal; And
Described driver element receives described output signal and described pulse signal, and exports driving signal to a light-emitting diode (LED) module.
10. driving method according to claim 9 is characterized in that, described pulse signal is a binary weights pulse signal.
11. driving method according to claim 9 is characterized in that, also comprises:
Export a write signal to described internal storage location by a writing address generation unit according to a bolt-lock enable signal.
12. a light emitting diode drive device, it cooperates with a plurality of light-emitting diode (LED) modules, it is characterized in that, comprising:
A plurality of internal storage locations, it is for coupling side by side;
One writing address generation unit produces a write signal according to a bolt-lock enable signal;
One reading address generation unit receives a pulse signal and exports a read signal to each described internal storage location; And
A plurality of driver elements couple with corresponding described internal storage location respectively,
One of them of wherein said internal storage location writes a GTG signal according to the said write signal, each described internal storage location outputs signal to corresponding described driver element according to described read signal output one, each described driver element is according to described output signal and described pulse signal, and output one drives signal to corresponding described light-emitting diode (LED) module.
13. light emitting diode drive device according to claim 12 is characterized in that, described pulse signal is a binary weights pulse signal.
14. light emitting diode drive device according to claim 12 is characterized in that, described reading address generation unit comprises:
One reading address counter receives described pulse signal; And
One reading address decoder couples with described reading address counter, and exports described read signal.
15. light emitting diode drive device according to claim 12 is characterized in that, described driving signal had a plurality of conducting period in a work period, and the described conducting period is discontinuous.
16. light emitting diode drive device according to claim 12 is characterized in that, each described driver element comprises:
One flip-flop couples with corresponding described internal storage location, and receives described output signal and described pulse signal; And
One driver is connected with described flip-flop and exports described driving signal.
17. light emitting diode drive device according to claim 12 is characterized in that, described internal storage location is a dual-port static random access memory.
18. light emitting diode drive device according to claim 12 is characterized in that, the said write address-generation unit comprises:
One write address counter receives described bolt-lock enable signal; And
One writing address decoder couples with the said write address counter, and output said write signal.
19. the driving method of a light-emitting diode (LED) module, it cooperates with a light emitting diode drive device, described light emitting diode drive device has a plurality of internal storage locations, a writing address generation unit, a reading address generation unit and a plurality of driver element, it is characterized in that described driving method comprises:
Described reading address generation unit receives a pulse signal and exports a read signal to each described internal storage location;
Each described internal storage location outputs signal to corresponding described driver element according to described read signal output one; And
Each described driver element is according to described output signal and described pulse signal, and output one drives signal to corresponding described light-emitting diode (LED) module.
20. driving method according to claim 19 is characterized in that, also comprises:
The said write address-generation unit produces a write signal according to a bolt-lock enable signal; And
One of them of described internal storage location writes a GTG signal according to the said write signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210129588.1A CN103379702B (en) | 2012-04-27 | 2012-04-27 | LED driving circuit, light emitting diode drive device and driving method |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201210129588.1A CN103379702B (en) | 2012-04-27 | 2012-04-27 | LED driving circuit, light emitting diode drive device and driving method |
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| CN103379702A true CN103379702A (en) | 2013-10-30 |
| CN103379702B CN103379702B (en) | 2015-09-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6486923B1 (en) * | 1999-03-26 | 2002-11-26 | Mitsubishi Denki Kabushiki Kaisha | Color picture display apparatus using hue modification to improve picture quality |
| TWI277024B (en) * | 2005-05-10 | 2007-03-21 | Synage Technology Corp | Programmable light emitting diode device |
| TW201021619A (en) * | 2008-11-24 | 2010-06-01 | Holtek Semiconductor Inc | LED control driver |
| US20100156317A1 (en) * | 2008-12-18 | 2010-06-24 | Sanyo Electronic Co., Ltd. | Light-emitting element driving circuit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6486923B1 (en) * | 1999-03-26 | 2002-11-26 | Mitsubishi Denki Kabushiki Kaisha | Color picture display apparatus using hue modification to improve picture quality |
| TWI277024B (en) * | 2005-05-10 | 2007-03-21 | Synage Technology Corp | Programmable light emitting diode device |
| TW201021619A (en) * | 2008-11-24 | 2010-06-01 | Holtek Semiconductor Inc | LED control driver |
| US20100156317A1 (en) * | 2008-12-18 | 2010-06-24 | Sanyo Electronic Co., Ltd. | Light-emitting element driving circuit |
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| CN103379702B (en) | 2015-09-23 |
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