CN103813579B - Light emitting diode driving circuit and driving system of light emitting diode - Google Patents
Light emitting diode driving circuit and driving system of light emitting diode Download PDFInfo
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- CN103813579B CN103813579B CN201210491783.9A CN201210491783A CN103813579B CN 103813579 B CN103813579 B CN 103813579B CN 201210491783 A CN201210491783 A CN 201210491783A CN 103813579 B CN103813579 B CN 103813579B
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Abstract
A light emitting diode driving circuit and a driving system of a light emitting diode are suitable for driving at least one light emitting diode, and the light emitting diode driving circuit comprises two shift temporary storage units and a data storage unit. The two shift register units can respectively store the values of different bits in the plurality of brightness setting data, and the data storage unit can be used for temporarily storing the value stored by one of the shift register units. Through the circuit architecture, the light emitting diode driving circuit can drive the light emitting diode by using the values of a plurality of bits in the same driving period, so that the driving efficiency of the light emitting diode driving circuit is improved.
Description
Technical field
The present invention relates to a kind of LED driving circuit, and particularly relate to a kind of single drive output can drive light-emitting diode LED driving circuit and drive system according to the value of two bits.
Background technology
Light-emitting diode (LightEmittingDiode is called for short LED) is a kind of solid-state light emitting element, and be made up of the semi-conducting material of P type and N-type, it can produce the autoradiolysis light in ultraviolet, visible ray and infrared spectral range.Because LED has the plurality of advantages such as power saving, the life-span is long, brightness is high, recently under the trend of environmental protection and energy-saving and carbon-saving, the application of LED is more and more extensive, the various lighting device etc. of the backlight module of such as traffic signals, street lamp, flashlight, liquid crystal display or for example LED bulb.
LED display industry is all connected in series a number with high color range resolution, high picture refreshing rate, high LED utilance, high number of scans, many driving chip and reduces costs as developing goal at present.Adopt basic money driving chip price inexpensively, but high color range resolution will be reached under the application of scan screen, high picture refreshing rate, high number of scans can cause LED utilance to reduce and a chip serial connection number tails off defect.Adopt more expensive built-in pulse width modulation (pluswidthmodulation, PWM) although the driving chip of function more easily can reach the target of high color range resolution and high LED utilance under the application of scan screen, a chip serial connection number and number of scans must then be reduced to pursue high picture refreshing rate.And adopt the driving chip cost of built-in pulse width modulation (pluswidthmodulation, PWM) function can increase many.
Parts of traditional technology propose LED driving method for improve light-emitting diode utilance (effectiverate) with picture update rate (refreshrate), can use the data of multiple bit to drive in same drive cycle, but general circuit framework also cannot provide multiple bits of multiple brightness settings simultaneously.
Summary of the invention
The invention provides a kind of LED driving circuit and its drive system, its LED driving circuit tool two displacement temporary storage unit and a data storage element, the data of two bits can be stored to an output simultaneously and carry out Data Update, making it be applicable to need multiple bit to carry out the LED driving method driven.
The embodiment of the present invention proposes a kind of LED driving circuit, be applicable to drive at least one light-emitting diode, comprise one first displacement temporary storage unit, one second displacement temporary storage unit, a path selection unit, a data storage element, an output select unit and a driver element.First displacement temporary storage unit is in order to receive one first data in a dimmer setting data; Second displacement temporary storage unit is in order to receive one second data in a dimmer setting data; Path selection unit is coupled to this first displacement temporary storage unit and this second displacement temporary storage unit, switches to the output of this first displacement temporary storage unit or the output of this second displacement temporary storage unit according to a path select signal; Data storage element is coupled to this first displacement temporary storage unit, stores these first data in this first shift registor according to a latch-up signal.
Output select unit is coupled to this data storage element and this second displacement temporary storage unit, exports select signal behavior to export the value stored by this data storage element or the value stored by this second displacement temporary storage unit according to one.Driver element is coupled to this output select unit, and the value stored by this data storage element, value stored by this second displacement temporary storage unit and an enable signal determine a fluorescent lifetime of these light-emitting diodes.
In an embodiment of the present invention, above-mentioned first displacement temporary storage unit and this second displacement temporary storage unit obtain these first data and this second data according to this path select signal respectively in this brightness settings.
In an embodiment of the present invention, above-mentioned driver element comprises at least one gate and a driver output circuit, two inputs of this gate are respectively coupled to the output of this enable signal and this output select unit, and the output of this gate couples this driver output circuit.
In an embodiment of the present invention, above-mentioned LED driving circuit also comprises a signal generation unit, be coupled to this output select unit, this path selection unit and this data storage element, signal, this path select signal and this latch-up signal are selected in this output of the array output of this signal generation unit one switching signal and this enable signal.
In an alternative embodiment of the invention, above-mentioned LED driving circuit also comprises a signal generation unit, be coupled to this output select unit, this path selection unit and this data storage element, signal, this path select signal and this latch-up signal are selected in this output of array output of this signal generation unit one switching signal and a data clock signal.
The present invention separately proposes a kind of drive system of light-emitting diode, comprises a control unit and above-mentioned LED driving circuit.Control unit is in order to export an enable signal and a dimmer setting data extremely above-mentioned LED driving circuit.
In sum, LED driving circuit of the present invention and its drive system have two displacement temporary storage unit and a data storage element, and the data that simultaneously can store two bits to a drive output drive light-emitting diode to provide driver element in single drive cycle.Circuit framework of the present invention goes for using the driving method of multidigit unit, and its circuit framework is simple and easy, and cost is low and must not improve transfer of data frequency range and can reach and obtain multiple bit to improve technology effect of driving usefulness simultaneously.
For making above-mentioned feature and advantage of the present invention become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.
Accompanying drawing explanation
Fig. 1 illustrates the drive system schematic diagram of the light-emitting diode of the embodiment of the present invention.
Fig. 2 illustrates the LED driving circuit schematic diagram of the embodiment of the present invention.
Fig. 3 A illustrates the circuit diagram of the LED driving circuit 120 of the embodiment of the present invention.
Fig. 3 B is the schematic diagram of signal generation unit according to another embodiment of the present invention.
Fig. 4 is the signal waveform schematic diagram of the embodiment of the present invention.
[main element symbol description]
Drive system: 100
Light-emitting diode: 101
Control unit: 110
LED driving circuit: 120
First displacement temporary storage unit: 210
Second displacement temporary storage unit: 220
Path selection unit: 230
Data storage element: 240
Output select unit: 250
Driver element: 260
Signal generation unit: 310
With door: 311,321
Shift registor: 312,322
Inverse gate: 323
With door: 351 ~ 35P
Driver output circuit: 361 ~ 36P
Waveform: 411 ~ 418
Output: OUT1 ~ OUTP
Export and select signal: SOUT
First clock signal: CLK1
Second clock signal: CLK2
Data input signal: DIN
Data output signal: DO
Data clock signal: DCK
Latch-up signal: LAT
Enable signal: EN
Anti-phase enable signal: ENB
Path select signal: SEL
Switching signal: SW
Embodiment
Hereinafter, the present invention will be described in detail by graphic explanation embodiments of the invention, and graphic in same reference numbers can in order to element like representation class.
Please refer to Fig. 1, Fig. 1 illustrates the drive system schematic diagram of the light-emitting diode of the embodiment of the present invention.Drive system 100 comprises control unit 110 and LED driving circuit 120, and control unit 110 is coupled to LED driving circuit 120, and output enable signal EN and data input signal DIN is to LED driving circuit 120.LED driving circuit 120 drives light-emitting diode 101, in order to produce gray scale variation according to enable signal EN and data input signal DIN.Control unit 110 is such as the controller of light emitting diode (LED) display screen, can be used to process and output display data, switching signal, latched data signal or data clock signal also can be provided to LED driving circuit 120.
According to different Chip scale and design requirement, control unit 110 can have different functions, and this enforcement is not limited.LED driving circuit 120 is such as the driving chip of light-emitting diode, and being mainly used to provides drive current to drive light-emitting diode 101.The GTG (brightness) that LED driving circuit 120 can utilize size of current or electric current output timing to produce to adjust light-emitting diode 101.Control unit 110 can be connected via printed circuit board (PCB) or holding wire with LED driving circuit 120, and the present embodiment does not limit the annexation between control unit 110 and LED driving circuit 120.
Please refer to Fig. 2, Fig. 2 illustrates the LED driving circuit schematic diagram of the embodiment of the present invention.LED driving circuit 120 comprises the first displacement temporary storage unit 210, second displacement temporary storage unit 220, path selection unit 230, data storage element 240, output select unit 250 and driver element 260.The input of the first displacement temporary storage unit 210 and the second displacement temporary storage unit 220 is coupled to the data input pin of LED driving circuit 120, in order to receive data input signal DIN.Data input signal DIN comprises dimmer setting data, in order to represent the driving brightness of separate radiation diode 101, the coded system of its data input signal DIN is such as generally going here and there order sequenced data, DMX512 agreement, Manchester's code (MANCHESTEREncoding), but the coded system of the present embodiment is not restricted to this.
The output of the first displacement temporary storage unit 210 and the second displacement temporary storage unit 220 is coupled to path selection unit 230, in order to transmit data.The output of path selection unit 230 is in order to export data output signal DO.Data storage element 240 is coupled to the first displacement temporary storage unit 210, in order to store the data in the first displacement temporary storage unit 210.Output select unit 250 is coupled to data storage element 240 and the second displacement temporary storage unit 220, in order to select to export the data in data storage element 240 or the second displacement temporary storage unit 220.
First displacement temporary storage unit 210 and the second displacement temporary storage unit 220 are mainly used to temporary from the dimmer setting data in the data input signal DIN of control unit 110, and the data that two brightness settings are relevant can be stored in two working areas according to the bit order of data input signal DIN by respectively.Dimmer setting data in data input signal DIN is such as the luma data (n is positive integer) of n bit.Luma data corresponds to the brightness settings of the light-emitting diode of indivedual output, and different output can have different brightness settings.LED driving circuit 120 meeting determines the light-emitting diode luminance driven according to dimmer setting data.
First displacement temporary storage unit 210 and the second displacement temporary storage unit 220 can receive the first data in dimmer setting data and the second data, the such as value of luma data difference bit respectively according to path select signal SEL.Illustrate for the dimmer setting data of 8 bits, first displacement temporary storage unit 210 can carry out the value that data shifts keeps in the 2nd position obtained in many dimmer setting data of corresponding different output when path select signal SEL is high level, and the second displacement temporary storage unit 220 can carry out the value that data shifts keeps in the 3rd bit obtained in many dimmer setting data of corresponding different output when path select signal SEL is low level.Under different time, transmit data to the first displacement temporary storage unit 210 and second displacement temporary storage unit 220 of data input signal DIN, the first displacement temporary storage unit 210 can get different bit values or data from the second displacement temporary storage unit 220 by this.First displacement temporary storage unit 210 and the second displacement temporary storage unit 220 can be by: the flip-flops such as R-S flip-flop (flip-flop), D type flip-flop, T-shaped flip-flop, JK flip-flop, D type latch unit or latch unit are formed, but the present embodiment is not limited.
First displacement temporary storage unit 210 and the second displacement temporary storage unit 220 can have multiple data storage elements, can store the bit value of many dimmer setting data with the multiple drive output of correspondence simultaneously.For example, the first displacement temporary storage unit 210 can be identical with the number of the output OUT1 ~ OUTP of driver element 260 with the bit number that the second displacement temporary storage unit 220 can store, but the present embodiment does not limit.
It is come from the first displacement temporary storage unit 210 or the second displacement temporary storage unit 220 that path selection unit 230 can switch according to path select signal SEL the data transmitted.For example, when the first displacement temporary storage unit 210 carries out data acquisition, path selection unit 230 can switch to the first displacement temporary storage unit 210, makes the data in the first displacement temporary storage unit 210 can be passed to the first displacement temporary storage unit in next LED driving circuit (driving chip).When the second displacement temporary storage unit 220 carries out data acquisition, path selection unit 230 can switch to the second displacement temporary storage unit 220, makes the data in the first displacement temporary storage unit 220 can be passed to the second displacement temporary storage unit in next LED driving circuit (driving chip).Path selection unit 230 is such as multiplexer, but the present embodiment is not limited.
Data storage element 240 can store the data in the first displacement temporary storage unit 210 according to latched data signal LAT, the first displacement temporary storage unit 210 can obtained the laggard row Data Update of data by data storage element 240.In other words, latched data signal LAT and path select signal SEL has the relation in sequential, and data storage element 240 can coordinate the Data Update timing acquisition of the first displacement temporary storage unit 210 the first data wherein also temporary.For the dimmer setting data of above-mentioned 8 bits, data storage element 240 can keep in the value of the 2nd bit stored in the first displacement temporary storage unit 210.Data storage element 240 is such as made up of side by side the flip-flops such as multiple R-S flip-flop (flip-flop), D type flip-flop, T-shaped flip-flop, JK flip-flop, D type latch unit or latch unit, but the present embodiment is not limited.
Output select unit 250 can select signal SOUT to select value stored in the value stored by output data storage element 240 or the second displacement temporary storage unit 220 to driver element 260 according to exporting.For example, output select unit 250 can export the value of the 3rd stored in the value of the 2nd bit in data storage element 240 and the second displacement temporary storage unit 220 to driver element 260 in the drive cycle of a light-emitting diode.
It is positive integer that driver element 260 has multiple output OUT1 ~ OUTP(P), in order to couple light-emitting diode 101.Driver element 250 can adjust the electric current of output OUT1 ~ OUTP to drive multiple light-emitting diode 101.Generally speaking, driver element 250 has multiple constant-current circuit, can control the electric current of inflow output OUT1 ~ OUTP respectively to determine fluorescent lifetime and the brightness of light-emitting diode 101.Sense of current can be determined according to the driving direction of design requirement and light-emitting diode 101, and the present embodiment does not limit the electric current outbound course of driver element 250 and the circuit design framework of its constant-current circuit.
Driver element 260 can determine the fluorescent lifetime of light-emitting diode according to the output of enable signal EN and output select unit 250.In other words, driver element 260 value stored by value stored in data storage element 240, the second displacement temporary storage unit 220 and enable signal EN can determine the fluorescent lifetime of the light-emitting diode that its drive end OUT1 ~ OUTP connects.For example, one drive cycle can be divided into two subcycles by driver element 260, then determine the effective fluorescent lifetime in first subcycle according to value stored in data storage element 240, determine the effective fluorescent lifetime in second subcycle according to value stored in the second displacement temporary storage unit 220.By the framework of LED driving circuit 120, driver element 260 can determine the fluorescent lifetime of light-emitting diode in single subcycle according to the value of the bit of two in dimmer setting data.
Because LED driving circuit 120 has two displacement temporary storage unit 210,220 and data storage element 240, therefore LED driving circuit 120 can carry out Data Update and driving simultaneously.For example, the first displacement temporary storage unit 210 and the second displacement temporary storage unit 220 can store the 1st bit (the first data) in multiple brightness settings and the 2nd bit (the second data) respectively according to path select signal SEL.Then, data storage element 240 can obtain the value of the 1st bit from the first displacement temporary storage unit 210, complete the storage of the 1st bit at data storage element 240 after, the first displacement temporary storage unit 210 just can carry out Data Update.Now, output select unit 250 can export the value in the second displacement temporary storage unit 220 or the value in data storage element 240 to driver element 260 to drive light-emitting diode.
After the first displacement temporary storage unit 210 completes data updating, the second displacement temporary storage unit 220 then can carry out data updating, and now, and output select unit 250 can export data in data storage element 240 to drive light-emitting diode.In other words, second displacement temporary storage unit 220 can carry out Data Update when output select unit 250 switches to data storage element 240, and the first displacement temporary storage unit 210 carries out Data Update then can obtain the data in the first displacement temporary storage unit 210 at data storage element 240 after.That is, when output select unit 250 switches to the second displacement temporary storage unit 220 once again, second displacement temporary storage unit 220 has completed the action of Data Update, driver element 260 does not need to wait update time of pending data, can obtain bit value needed for next record dimmer setting data or the next one to drive light-emitting diode.
It should be noted that, above-mentioned path select signal SEL, latch-up signal LAT, enable signal EN select signal SOUT to be provided by external circuit (as control unit 110) or to be provided by the internal circuit of LED driving circuit 120 with output, and the present embodiment is unrestricted.
Please refer to Fig. 3 A, Fig. 3 A illustrates the circuit diagram of the LED driving circuit 120 of the embodiment of the present invention.Driver element 260 can be made up of multiple gate and driver output circuit, such as multiple with door (ANDgate) 351 ~ 35P and driver output circuit 361 ~ 36P.The output of enable signal EN and output select unit 250 is received respectively with the input of door 351 ~ 35P, be coupled to driver output circuit 361 ~ 36P with the output of door 351 ~ 35P, the output according to enable signal EN and output select unit 250 determines whether driver output circuit 361 ~ 36P drives light-emitting diode 101.From Fig. 3 A, when enable signal EN is logic high potential and the output of output select unit 250 is logic high potential (logical one), could be enable with the output of door 351 ~ 35P, make driver output circuit 361 ~ 36P output current.Driver output circuit 361 ~ 36P, such as determine current output circuit, can export and determine electric current to drive light-emitting diode 101.
LED driving circuit 120 separately comprises signal generation unit 310, be coupled to output select unit 250, path selection unit 230 and data storage element 240, signal generation unit 310 selects signal SOUT, path select signal SEL and latch-up signal LAT according to the above-mentioned output of array output of switching signal SW and enable signal EN.
Please refer to Fig. 3 B, Fig. 3 B is the schematic diagram of signal generation unit according to another embodiment of the present invention.In an alternative embodiment of the invention, signal generation unit 310 is coupled to output select unit 250, path selection unit 230 and data storage element 240, can select signal SOUT, path select signal SEL and latch-up signal LAT according to the above-mentioned output of array output of switching signal SW and data clock signal DCK.
Export and select signal SOUT, path select signal SEL all relevant with the sequential that data are transmitted to latch-up signal LAT, as long as therefore the coherent signal of sequential of response data input signal DIN all can be used to produce export and select signal SOUT, path select signal SEL and latch-up signal LAT, the present embodiment does not limit producing method.It should be noted that, the signals such as the switching signal SW in Fig. 3 A, enable signal EN, data input signal DIN and data clock signal DCK all or part ofly can export LED driving circuit 120 to by control unit 110, but the producing method of the present embodiment not restricting signal.
First displacement temporary storage unit 210 comprises gate (with door 311) and shift registor 312, receive with two inputs of door 311 the data clock signal DCK and path select signal SEL that come from control unit 110 respectively, its output then exports the first clock signal clk 1 to shift registor 312.The input of shift registor 312 is coupled to data input signal DIN, and its input end of clock is then coupled to the output with door 311.
Second displacement temporary storage unit 220 comprises gate (with door 321 and inverse gate 323) and shift registor 322, receive respectively with two inputs of door 321 and come from the data clock signal DCK of control unit 110 and the output of inverse gate 323, the input of inverse gate 323 is coupled to path select signal SEL.Second clock signal CLK2 is then exported to shift registor 322 with the output of door 321.The input of shift registor 322 is coupled to data input signal DIN, and its input end of clock is then coupled to the output with door 321.
From foregoing circuit framework, when path select signal SEL is logic high potential, the first displacement temporary storage unit 210 can carry out Data Update, and the second displacement temporary storage unit 220 then can not carry out Data Update; When path select signal SEL is logic low potential, the second displacement temporary storage unit 220 can carry out Data Update, and the first displacement temporary storage unit 210 then can not carry out Data Update.
Utilize path select signal SEL, the first displacement temporary storage unit 210 can obtain the dimmer setting data in data input signal DIN in different sequential from the second displacement temporary storage unit 220.Further, the first displacement temporary storage unit 210 and the second displacement temporary storage unit 220 can according to the dimmer setting data in data clock signal DCK temporal data input signal DIN.
Next, please also refer to Fig. 4, Fig. 4 is the signal waveform schematic diagram of the embodiment of the present invention.Fig. 4 illustrates above-mentioned data input signal DIN, data clock signal DCK, switching signal SW, enable signal EN, anti-phase enable signal ENB, path select signal SEL, second clock signal CLK2, the first clock signal clk 1, latch-up signal LAT and exports the sequential relationship selecting signal SOUT.
When the waveform 411 of path select signal SEL is high level, first displacement temporary storage unit 210 obtains multiple high bit MSB(such as the 5th bit in many dimmer setting data by data input signal DIN) value, then, when the waveform 411 of path select signal SEL switches to low level waveform 412, the second displacement temporary storage unit 220 obtains multiple low bit LSB(such as the 1st bit in many dimmer setting data by data input signal DIN) value.Then, latch-up signal LAT produces enabling pulse 413, makes data storage element 240 obtain the value of the multiple high bit MSB in the first displacement temporary storage unit 210.Then, when output selects the waveform 414 of signal SOUT to be low level, output select unit 250 can export the value of multiple low bit LSB stored in the second displacement temporary storage unit 220.
The enable waveform 415(high level of enable signal EN) make driver element 260 drive light-emitting diode 101 according to the value of multiple low bit LSB stored in the second displacement temporary storage unit 220.Now, path select signal SEL switches to the waveform 416 of high level, makes the first displacement temporary storage unit 210 carry out Data Update.Then, export and select the waveform 418 of signal SOUT correspondence can switch to high level, output select unit 240 is made to export value stored in data storage element 240 to driver element 260, enable signal EN switches to the enable waveform 417 of high level afterwards, makes driver element 260 drive light-emitting diode 101 according to the value of multiple high bit MSB stored in data storage element 240.The rest may be inferred, and LED driving circuit 120 can constantly update data and according to new data to drive light-emitting diode.
It should be noted that, above-mentioned waveform is only one of execution mode that the present embodiment circuit is described, the enable level of its each signal can be determined according to design requirement, via the explanation of above-described embodiment, those skilled in the art should know all the other execution modes by inference easily, do not add repeat at this.
In addition, it should be noted that the relation that couples between said elements comprises direct or indirect electric connection, as long as can reach required electrical signal transfer function, the present invention is not limited.Technological means in above-described embodiment can merge or be used alone, and its element can increase, remove, adjust or replace according to its function and design requirement, and the present invention is not limited.After via the explanation of above-described embodiment, those skilled in the art should know its execution mode by inference, do not add repeat at this.
In sum, the framework of the LED driving circuit that the embodiment of the present invention proposes can store bit values different in many dimmer setting data simultaneously, make drive circuit can in same drive cycle, utilize multiple bit value to drive, light-emitting diode utilance and picture update rate can be improved by this.
Although embodiments of the invention have disclosed as above; but the present invention is not limited to above-described embodiment; any person of an ordinary skill in the technical field; not departing from the scope disclosed by the present invention; when doing a little change and adjustment, therefore protection scope of the present invention should be as the criterion with the accompanying claim person of defining.
Claims (10)
1. a LED driving circuit, be applicable to drive at least one light-emitting diode, it is characterized in that, described LED driving circuit comprises:
First displacement temporary storage unit, in order to receive one first data in a dimmer setting data;
Second displacement temporary storage unit, in order to receive one second data in a dimmer setting data;
Path selection unit, is coupled to described first displacement temporary storage unit and described second displacement temporary storage unit, switches to the output of described first displacement temporary storage unit or the output of described second displacement temporary storage unit according to a path select signal;
Data storage element, is coupled to described first displacement temporary storage unit, stores described first data in described first shift registor according to a latch-up signal;
Output select unit, is coupled to described data storage element and described second displacement temporary storage unit, exports select signal to select to export the value stored by described data storage element or the value stored by described second displacement temporary storage unit according to one; And
Driver element, is coupled to described output select unit, and the value stored by described data storage element, value stored by described second displacement temporary storage unit and an enable signal decide the fluorescent lifetime of described light-emitting diode;
Wherein, described second displacement temporary storage unit can be selected to carry out Data Update when exporting described data storage element at described output select unit, and described first displacement temporary storage unit can obtain the laggard row Data Update of data of described first displacement temporary storage unit at described data storage element.
2. LED driving circuit according to claim 1, it is characterized in that, described first displacement temporary storage unit and described second displacement temporary storage unit obtain described first data and described second data according to described path select signal respectively in described dimmer setting data.
3. LED driving circuit according to claim 1, is characterized in that, described path select signal, described output select signal and described latch-up signal to be produced by an internal circuit.
4. LED driving circuit according to claim 1, it is characterized in that, described driver element comprises at least one gate and a driver output circuit, two inputs of described gate are respectively coupled to the output of described enable signal and described output select unit, and the output of described gate is coupled to described driver output circuit.
5. LED driving circuit according to claim 1, is characterized in that, described LED driving circuit also comprises:
Signal generation unit, be coupled to described output select unit, described path selection unit and described data storage element, the combination of described signal generation unit one switching signal and described enable signal exports described path select signal, signal is selected in described output and described latch-up signal.
6. LED driving circuit according to claim 1, is characterized in that, described LED driving circuit also comprises:
Signal generation unit, be coupled to described output select unit, described path selection unit and described data storage element, the combination of described signal generation unit one switching signal and a data clock signal exports described path select signal, signal is selected in described output and described latch-up signal.
7. a drive system for light-emitting diode, is characterized in that, described drive system comprises:
Control unit, in order to export an enable signal and a dimmer setting data; And
LED driving circuit, is coupled to described control unit, and described LED driving circuit comprises:
First displacement temporary storage unit, in order to receive one first data in described dimmer setting data;
Second displacement temporary storage unit, in order to receive one second data in described dimmer setting data;
Path selection unit, is coupled to described first displacement temporary storage unit and described second displacement temporary storage unit, switches to the output of described first displacement temporary storage unit or the output of described second displacement temporary storage unit according to a path select signal;
Data storage element, is coupled to described first displacement temporary storage unit, stores described first data in described first shift registor according to a latch-up signal;
Output select unit, is coupled to described data storage element and described second displacement temporary storage unit, exports select signal to select to export the value stored by described data storage element or the value stored by described second displacement temporary storage unit according to one; And
Driver element, is coupled to described output select unit, and the value stored by the value stored according to described data storage element, described second displacement temporary storage unit and an enable signal decide the fluorescent lifetime of described light-emitting diode;
Wherein, described second displacement temporary storage unit can be selected to carry out Data Update when exporting described data storage element at described output select unit, and described first displacement temporary storage unit can obtain the laggard row Data Update of data of described first displacement temporary storage unit at described data storage element.
8. the drive system of light-emitting diode according to claim 7, it is characterized in that, described first displacement temporary storage unit and described second displacement temporary storage unit obtain described first data and described second data according to described path select signal respectively in described dimmer setting data.
9. the drive system of light-emitting diode according to claim 7, it is characterized in that, described control unit can export a switching signal, described LED driving circuit according to described switching signal and described enable signal combination exports described path select signal, signal is selected in described output and described latch-up signal.
10. the drive system of light-emitting diode according to claim 7, it is characterized in that, described control unit can export a switching signal and a data clock signal, described LED driving circuit according to described switching signal and described clock signal combination exports described path select signal, signal is selected in described output and described latch-up signal.
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| Application Number | Priority Date | Filing Date | Title |
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| TW101141796A TWI491304B (en) | 2012-11-09 | 2012-11-09 | Led driver circuit and driver system |
| TW101141796 | 2012-11-09 |
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| CN103813579B true CN103813579B (en) | 2016-04-06 |
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| TWI489909B (en) | 2013-09-18 | 2015-06-21 | Macroblock Inc | Light emitting diode drive system and control method |
| TWI609602B (en) * | 2014-12-16 | 2017-12-21 | Macroblock Inc | Multi-channel light emitting diode drive control device and system |
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Also Published As
| Publication number | Publication date |
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| TWI491304B (en) | 2015-07-01 |
| TW201419937A (en) | 2014-05-16 |
| CN103813579A (en) | 2014-05-21 |
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