CN102215620A - Device and method for driving light-emitting diode (LED) - Google Patents
Device and method for driving light-emitting diode (LED) Download PDFInfo
- Publication number
- CN102215620A CN102215620A CN2010101499926A CN201010149992A CN102215620A CN 102215620 A CN102215620 A CN 102215620A CN 2010101499926 A CN2010101499926 A CN 2010101499926A CN 201010149992 A CN201010149992 A CN 201010149992A CN 102215620 A CN102215620 A CN 102215620A
- Authority
- CN
- China
- Prior art keywords
- sub
- drive signal
- data
- emitting diode
- drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a device and a method for driving a light-emitting diode (LED), which are suitable for driving at least one first LED unit and a second LED unit. The driving device comprises a data transfer unit and a driving unit, wherein the data transfer unit receives and stores driving data; the driving data comprises first data and second data; the first data corresponds to a first driving signal; the second data corresponds to a second driving signal; and the driving unit distinguishes the first driving signal into a plurality of first sub-driving signals, distinguishes the second driving signal into a plurality of second sub-driving signals and alternately outputs the first sub-driving signals and the second sub-driving signals so as to alternately drive the first LED unit and the second LED unit.
Description
Technical field
The present invention relates to a kind of drive unit of light-emitting diode, and be particularly related to a kind of drive unit and its driving method that under scanning is used, can increase the light-emitting diode of picture update rate.
Background technology
(Light Emitting Diode, volume LED) is little, power saving and durable, and along with the maturation of processing procedure, price descends, and is recently more and more general as the product of light source with light-emitting diode for light-emitting diode.Light-emitting diode is widely used in various terminal equipments, from car headlamp, traffic lights, literal display, billboard and large-screen video display, to fields such as common and architectural lighting and LCD are backlight.
Light emitting diode indicator mainly is made up of dot matrix LEDs, and the pixel on the picture partly is made up of red (R), green (G), blue (B) three, and each partly can be made up of one or more LED according to design requirement, and is not limited.When display frame, red, blue, the green brightness of adjusting in the pixel just can show different colors.Picture update rate (Refresh Rate) is meant the speed that screen-picture upgrades, and the frame updating cycle then is the inverse of picture update rate, in order to the time of representing that a picture stops.In order to reduce the cost of display, utilize the technology that improves the LED drive current and cooperate scanning can reduce the usage quantity of drive circuit in a large number.Because LED adopts current drives, be subject to the current driving ability and the transfer capability of led drive circuit, picture update rate also can't obtain effective lifting.
Summary of the invention
The invention provides a kind of drive unit and its driving method of light-emitting diode, be applicable to that the scanning application to drive a plurality of LED unit, can improve the picture update rate of light-emitting diode display by the cutting scan period.
The present invention proposes a kind of drive unit of light-emitting diode, and above-mentioned drive unit is applicable to and drives at least one first light emitting diode and one second light emitting diode that above-mentioned drive unit comprises a data transfer unit and a driver element.The data transfer unit is in order to receive and to store a driving data, and above-mentioned driving data comprises one first data and one second data, and above-mentioned first data is corresponding to one first drive signal, and above-mentioned second data is corresponding to one second drive signal.Driver element is coupled to above-mentioned data transfer unit, drives above-mentioned first light emitting diode according to above-mentioned first data, drives above-mentioned second light emitting diode according to above-mentioned second data.Wherein, above-mentioned driver element is divided into a plurality of first sub-drive signal with above-mentioned first drive signal, above-mentioned second drive signal is divided into a plurality of second sub-drive signal, and the staggered then output above-mentioned first sub-drive signal and the above-mentioned second sub-drive signal are with staggered above-mentioned first light emitting diode and above-mentioned second light emitting diode of driving.
In an embodiment of the present invention, above-mentioned driver element is divided into a plurality of first sub-update cycle and a plurality of second sub-update cycle with a frame updating periodic region, the above-mentioned first sub-update cycle and the above-mentioned second sub-update cycle are interconnected, and above-mentioned driver element respectively in the above-mentioned first sub-update cycle output the above-mentioned first sub-drive signal, and respectively in the above-mentioned second sub-update cycle output the above-mentioned second sub-drive signal.The wherein above-mentioned first sub-update cycle is non-conterminous mutually, and the above-mentioned second sub-update cycle is non-conterminous mutually.
In an embodiment of the present invention, above-mentioned driver element comprises one first storage element, one second storage element.First storage element is coupled to above-mentioned data transfer unit, in order to store above-mentioned first data.Second storage element is coupled to above-mentioned data transfer unit, in order to store above-mentioned second data.
In an embodiment of the present invention, above-mentioned driver element comprises that also one selects circuit, a pulse wave dnsity modulation unit, an output unit and a counting unit.Select circuit to be coupled to above-mentioned first storage element and above-mentioned second storage element, export above-mentioned first data or above-mentioned second data in order to selectivity.Pulse wave dnsity modulation (pulse density modulation) unit is coupled to the output of above-mentioned selection circuit, produces a plurality of first sub-work period and a plurality of second sub-work period according to the output and a count signal of above-mentioned selection circuit.Output unit is coupled to above-mentioned pulse wave dnsity modulation unit, produces the above-mentioned first sub-drive signal and the above-mentioned second sub-drive signal according to the above-mentioned first sub-work period and the second sub-work period.Counting unit is coupled to above-mentioned pulse wave dnsity modulation unit, in order to export above-mentioned count signal.
In an embodiment of the present invention, above-mentioned driver element also comprises one first pulse wave dnsity modulation unit, one second pulse wave dnsity modulation unit, a selected cell and a counting unit.The first pulse wave dnsity modulation unit is coupled to above-mentioned first storage element, exports for a plurality of first sub-work period according to above-mentioned first data and one first count signal.The second pulse wave dnsity modulation unit is coupled to above-mentioned second storage element, exports for a plurality of second sub-work period according to above-mentioned second data and one second count signal.Selected cell is coupled to above-mentioned first pulse wave dnsity modulation unit and the above-mentioned second pulse wave dnsity modulation unit, exports the above-mentioned first sub-work period or the above-mentioned second sub-work period in order to selectivity.Output unit is coupled to above-mentioned selected cell, produces the above-mentioned first sub-drive signal according to the above-mentioned first sub-work period, produces the above-mentioned second sub-drive signal according to the above-mentioned second sub-work period.Counting unit then is coupled to above-mentioned first pulse wave dnsity modulation unit and the above-mentioned second pulse wave dnsity modulation unit, and exports above-mentioned first count signal and above-mentioned second count signal respectively.
In an embodiment of the present invention, above-mentioned drive unit also comprises one first switch, a second switch and a controller.First switch is coupled between the end and an operating voltage of above-mentioned first light emitting diode, and second switch is coupled between the end and above-mentioned operating voltage of above-mentioned second light emitting diode.In order to the conducting of controlling above-mentioned first switch and above-mentioned second switch whether and transmit controlling signal to drive circuit controller is coupled to above-mentioned first switch and above-mentioned second switch and drive circuit.In addition, the position is set can be arranged on different positions according to different circuit frameworks of first switch and second switch, the present invention is not limited.For example, first switch and second switch also can be arranged between light emitting diode and the drive circuit, with the whether conducting of control light emitting diode.
In an embodiment of the present invention, above-mentioned driver element is more in each adjacent above-mentioned first sub-drive signal and output one black plug (black insertion) signal between this second sub-drive signal respectively.
In an embodiment of the present invention, above-mentioned first light emitting diode is made up of the single or multiple light-emitting diodes that are connected in series respectively with above-mentioned second light emitting diode.Above-mentioned data transfer unit and above-mentioned driver element system are integrated among the one drive circuit.
From another perspective, the present invention proposes a kind of driving method of light-emitting diode, be applicable to and drive at least one first light emitting diode and one second light emitting diode, above-mentioned driving method comprises the following steps: to receive and store a driving data, above-mentioned driving data comprises one first data and one second data, above-mentioned first data is corresponding to one first drive signal, and above-mentioned second data is corresponding to one second drive signal; Above-mentioned first drive signal is divided into a plurality of first sub-drive signal, above-mentioned second drive signal is divided into a plurality of second sub-drive signal; And the staggered output above-mentioned first sub-drive signal and the above-mentioned second sub-drive signal are with staggered above-mentioned first light emitting diode of driving and above-mentioned second light emitting diode.
In an embodiment of the present invention, above-mentioned driving method also comprises a frame updating periodic region is divided into a plurality of first sub-update cycle and a plurality of second sub-update cycle, the above-mentioned first sub-update cycle and the above-mentioned second sub-update cycle are interconnected, then respectively at the output above-mentioned first sub-drive signal in the above-mentioned first sub-update cycle, and respectively at the output above-mentioned second sub-drive signal in the above-mentioned second sub-update cycle.
Based on above-mentioned, the present invention will be divided into a plurality of sub-drive signals corresponding to the drive signal of different light emitting diodes, then with interlace mode, cooperate default sequential output with the different light emitting diode of staggered driving.The present invention can be applicable in the light emitting diode indicator, carries the picture update rate of light emitting diode indicator by this.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Figure 1A is the drive unit schematic diagram according to the light-emitting diode of first embodiment of the invention.
Figure 1B is the drive unit schematic diagram of light-emitting diode according to another embodiment of the present invention.
Fig. 2 and Fig. 3 are the driving sequential according to first embodiment of the invention.
Fig. 4 is the circuit block diagram according to the drive circuit 120 of first embodiment of the invention.
Fig. 5 is the circuit block diagram according to the drive circuit of second embodiment of the invention.
Fig. 6 A is the drive unit schematic diagram according to the light-emitting diode of second embodiment of the invention.
Fig. 6 B is the drive unit schematic diagram of light-emitting diode according to another embodiment of the present invention.
Fig. 6 C is depicted as the circuit framework of drive circuit among Fig. 6 B.
Fig. 7 and Fig. 8 are the picture black frame insertion signal schematic representation according to third embodiment of the invention.
Fig. 9 is the driving method according to the light-emitting diode of fourth embodiment of the invention.
The main element symbol description
110: controller; 120: drive circuit;
210,220: drive signal; 211～214,221～224: sub-drive signal;
410: driver element; 412,413: storage element;
414: select circuit; 415: pulse wave dnsity modulation unit;
416: output unit; 417,617: counting unit;
420: the data transfer unit; 510,520: pulse wave dnsity modulation unit;
710,810: black picture; VLED: operating voltage;
LAT1, LAT2: bolt-lock signal; SW1, SW2: switch;
GND: earth terminal; DCK: clock signal;
DIN: drive data LAT: the bolt-lock signal
SCAN: sweep signal; GCK: GTG control signal;
LED1, LED2: light emitting diode; S910～S930: step.
Embodiment
First embodiment
Please refer to Figure 1A, Figure 1A is the drive unit schematic diagram according to the light-emitting diode of first embodiment of the invention.Drive unit comprises controller 110, drive circuit 120 and switch SW 1, SW2, and controller 110 is coupled to drive circuit 120, in order to export the driving data and to control signal to drive circuit 120.Drive circuit 120 is coupled to two light emitting diode LED1, LED2, switch SW 1, SW2 are respectively coupled between light emitting diode LED1, LED2 and the operating voltage VLED, in order to the conducting of control switch SW1, SW2 whether controller 110 is coupled to switch SW 1, SW2., via the conducting of control switch SW1, SW2 whether drive circuit 120 is driven for emitting lights diode LED1, LED2 optionally.In other words, Fig. 1 belongs to the circuit framework of 1/2 scanning, and an output connecting pin of drive circuit 120 can drive two light emitting diode LED1, LED2.Light emitting diode LED1, LED2 can be formed by a plurality of LED serial connections, but present embodiment is not limited.In addition, the framework of present embodiment also can extend the circuit framework that is applied to 1/4 scanning or 1/8 scanning, and present embodiment is not limited.
The present embodiment drive unit is applicable to that dissimilar LED drives framework, please refer to Figure 1B, and Figure 1B is the drive unit schematic diagram of light-emitting diode according to another embodiment of the present invention.Figure 1B is that with the main difference of Figure 1A both are the driving types that belong to different, and Figure 1A then is Source-type for Sink-type Figure 1B.In addition among Figure 1B switch SW 1, SW2 to couple the position also different.Switch SW 1 is coupled between drive circuit 120 and the light emitting diode LED1, and the other end of light emitting diode LED1 is coupled to earth terminal GND.Switch SW 2 is coupled between drive circuit 120 and the light emitting diode LED2, and the other end of light emitting diode LED2 is coupled to earth terminal GND.Though Figure 1A belongs to different driving types with Figure 1B, all is applicable to the drive unit of present embodiment.
Next the circuit framework with Figure 1A is an example, further specifies the driving sequential of present embodiment, please refer to Fig. 2, and Fig. 2 is the driving sequential according to first embodiment of the invention.Figure 2 shows that the driving sequential of drive unit under 1/2 scanning is used.For reaching the effect of double drive, a frame updating cycle is divided into signal period 1 and signal period 2.Driven for emitting lights diode LED1 in the signal period 1, driven for emitting lights diode LED2 in the signal period 2.For instance, with reference to the drive waveforms among Fig. 2, drive signal 210 is to be used for driven for emitting lights diode LED1, and drive signal 220 is to be used for driven for emitting lights diode LED2.Drive signal 210 and 220 is to produce via drive circuit 120, and its signal producing method for example is to utilize pulse wave width modulation (Pulse Width Modulation) unit or pulse wave dnsity modulation (Pulse Density Modulation) unit to produce according to the pulse wave width modulation signal that the driving data is produced.
As shown in Figure 2, drive circuit 120 can a frame updating in the cycle mode with timesharing drive two light emitting diode LED1, LED2, can reduce the number that drives wafer.In the present embodiment, for picture update rate is improved, present embodiment is divided into a plurality of sub-update cycle 1-1～1-4,2-1～2-4 with signal period 1 and signal period 2, also drive signal 210 and 220 is divided into a plurality of sub-drive signals 211～214,221～224 simultaneously.The sequential submission mispairing of sub-update cycle 1-1～1-4,2-1～2-4 is put and the sub-drive signal 211～214,221～224 of output in sub-update cycle 1-1～1-4, the 2-1～2-4 of correspondence.By this, sub-drive signal 211～214,221～224 can be exported with staggered driven for emitting lights diode LED1, LED2 to improve picture update rate in staggered mode.110 of controllers can cooperate corresponding sub-update cycle 1-1～1-4,2-1～2-4 conducting (on) or cut out (off) switch SW 1, SW2 to allow sub-drive signal 211～214,221～224 come driven for emitting lights diode LED1, LED2 with interlace mode.
In Fig. 3, drive circuit 120 is divided into four sub-update cycle 1-1～1-4 with the signal period 1, equally is divided into four sub-update cycle 2-1～2-4 the signal period 2.Sub-update cycle 1-1～1-4 and sub-update cycle 2-1～2-4 are interconnected, and the sub-update cycle that the same signal cycle is partitioned into is non-conterminous mutually each other.That is to say that sub-update cycle 1-1～1-4 is non-conterminous mutually each other, sub-update cycle 2-1～2-4 is also non-conterminous mutually each other, as shown in Figure 3.Corresponding, drive circuit also can be divided into drive signal 210,220 a plurality of sub-drive signals 211～214,221～224 with sub-update cycle 1-1～1-4, the 2-1～2-4 output in correspondence.In the present embodiment, drive signal 210,220 is divided into four sub-drive signals 211～214,221～224 is the example explanation, sub-drive signal 211～214 can be respectively at being output among sub-update cycle 1-1～1-4 with driven for emitting lights diode LED1, and 221～224 of sub-drive signals can be respectively at being output with driven for emitting lights diode LED2 among sub-update cycle 2-1～2-4.Because drive signal 210 is split into four parts, so the turnover rate of its light emitting diode LED1 can improve four times compared to prior art, and in like manner the turnover rate of light emitting diode LED2 also can improve four times.By this, the picture update rate of whole LED display also can improve four times to avoid the problem of film flicker or signal depletion.
In addition, it should be noted that present embodiment is the example explanation with the sub-drive signal 211～214 that drive signal 210 is divided into four parts, but present embodiment is not limited.The sub-drive signal that drive signal 210 can be divided into varying number according to design requirement with respectively at output among sub-update cycle 1-1～1-4 with driven for emitting lights diode LED1.In like manner, the drive signal 220 sub-drive signal that also can be split into varying number is come driven for emitting lights diode LED2.As long as export the effect that to reach the raising picture update rate with interlace mode corresponding to the sub-drive signal (as 211～214 and 221～224) that the drive signal (as 210 and 220) of different light emitting diodes (as LED1 and LED2) is split.In addition, because the pulse bandwidth corresponding to the drive signal of high gray value is bigger, so may be partitioned into the sub-drive signal of a greater number, but, have the effect that improves picture update rate equally as long as its sub-drive signal on average was scattered in the corresponding sub-update cycle.Same, the quantity of cutting apart of sub-update cycle also is not limited to four, can be divided into quantity greater than 1 according to design requirement.After via exposure of the present invention, the present technique field has knows that usually the knowledgeable should know its execution mode easily by inference, does not add tired stating at this.In addition, in another embodiment of the present invention, the sub-drive signal of being exported in the single individual sub-update cycle can be one or more.For instance, the sub-drive signal number that is split when drive signal 210 is less than or equal to that the signal period 1 is partitioned into sub-update cycle is during number, the sub-drive signal that drive signal 210 is split can be exported in the sub-update cycle of correspondence in regular turn, the sub-drive signal number that is split when drive signal 210 was partitioned into greater than the signal period 1 sub-update cycle is during number, and the sub-drive signal that drive signal 210 is split can be exported a plurality of sub-drive signals with the output interval of all sub-drive signals of mean allocation as far as possible in the identical sub-update cycle.
Please refer to Fig. 4, Fig. 4 is the circuit block diagram according to the drive circuit 120 of first embodiment of the invention.Drive circuit 120 comprises driver element 410 and data transfer unit 420, and driver element 410 is coupled to data transfer unit 420.Driver element 410 comprises storage element 412,413, selection circuit 414, pulse wave dnsity modulation unit 415, output unit 416 and counting unit 417.Storage element 412,413 is coupled to data transfer unit 420, selects circuit 414 to be coupled to pulse wave dnsity modulation unit 415, and output unit 416 is coupled to the output of pulse wave dnsity modulation unit 415.Bolt-lock signal LAT1, LAT2 can be used to trigger storage element 412,413 with the data in the data searching transfer unit 420, and counting unit 417 is coupled to pulse wave dnsity modulation unit 415.
According to clock signal DCK, data transfer unit 420 can receive and store one and drive data DIN, driving data DIN comprises the driving data corresponding to light emitting diode LED1, LED2, represent with first data and second data respectively, wherein first data corresponding to drive signal 210, the second data then corresponding to drive signal 220.Then, storage element 412,413 can according to bolt-lock signal LAT1, LAT2 receive respectively and storage drive data DIN in first data and second data.In other words, in the cycle, data transfer unit 420 can transmit the LED that stores more than two and drive data, or the driving data of two LED tandems at a frame updating.In addition, bolt-lock signal LAT1, LAT2 can be provided or produced by drive circuit 120 is inner by external system, and present embodiment is not limited.
Select circuit 414 to select to switch to storage element 412 or storage element 413 to export first data or second data to pulse wave dnsity modulation unit 415 according to sweep signal SCAN.Counting unit 417 can be according to GTG control signal GCK output count signal CS to pulse wave dnsity modulation unit 415.Pulse wave dnsity modulation signal is exported to output unit 416 according to count signal CS with the output (i.e. first data or second data) of selecting circuit 414 in pulse wave dnsity modulation unit 415.Output unit 416 produces drive signal IOUT, just drive signal 210 and 220 according to received pulse wave dnsity modulation signal.
Select the configuration relation of circuit 414 meetings according to sub-update cycle 1-1～1-4,2-1～2-4, selectivity switches to the output of storage element 412 or 413.For example, during sub-update cycle 1-1～1-4, switch to storage element 412, during sub-update cycle 2-1～2-4, switch to storage element 413.Then, by the counting sequence of adjusting count signal CS, pulse wave dnsity modulation unit 415 can be divided into several sub-work periods with the work period of the pulse wave dnsity modulation signal of its output and adjust the appearance sequential of sub-work period.Then, output unit 416 is according to the received corresponding sub-drive signal of sub-work period output, shown in the drive waveforms of Fig. 3.In other words, select circuit 414 to drive data (i.e. first data or second data) according to the corresponding LED of the order output of default sub-update cycle 1-1～1-4,2-1～2-4,415 of pulse wave dnsity modulation unit can drive data according to received LED then, the corresponding sub-work period of output makes output unit 416 can export the drive signal IOUT as the drive waveforms of Fig. 3 in sub-update cycle 1-1～1-4, the 2-1～2-4 of correspondence.By this, the just exportable staggered sub-drive signal of output unit 416 is with driven for emitting lights diode LED1, LED2.
It should be noted that pulse wave dnsity modulation unit 415 comprises pulse width modulation circuit, and pulse wave dnsity modulation unit 415 can be divided into the complete work period several sub-work periods.For example have digital comparator in the pulse wave dnsity modulation unit 415, just the work period can be divided into several sub-work periods as long as adjust the bit order of count signal.After via exposure of the present invention, the present technique field has knows that usually the knowledgeable should know its execution mode easily by inference, does not add tired stating at this.
In another embodiment of the present invention, above-mentioned drive circuit 120 can be set up more storage element and drive plural light emitting diode to be applicable to, present embodiment is not limited.Drive circuit 120 can be divided into a plurality of sub-update cycles with a frame updating cycle according to the light emitting diode quantity that is driven, and improves picture update rate with the corresponding in regular turn sub-drive signal of interlace mode then.
Second embodiment
Please refer to Fig. 5, Fig. 5 is the circuit block diagram according to the drive circuit of second embodiment of the invention.The main difference of Fig. 5 and Fig. 4 is pulse wave dnsity modulation unit 510,520 and selects the circuit framework of circuit 414.Pulse wave dnsity modulation unit 510,520 is respectively coupled to storage element 412,413 and selects between the circuit 414.Pulse wave dnsity modulation unit 510,520 can be converted to a plurality of first sub-work period and a plurality of second sub-work period respectively with first data in the storage element 412,413 and second data earlier.Then, select circuit 414 can switch to pulse wave dnsity modulation unit 510 or 520 according to the configuration sequence of sub-update cycle 1-1～1-4,2-1～2-4 to export the corresponding sub-work period to output unit 416.Output unit 416 can be exported sub-drive signal 211～214,221～224 according to the received sub-work period equally.
In other words, in Fig. 4, drive circuit 120 is to switch data source earlier, just exports the sub-work period then.Yet in Fig. 5, drive circuit 120 is earlier data to be converted to the sub-work period, and then selects the order of output.Though Fig. 4 and Fig. 5 circuit framework are variant slightly, all can export staggered sub-drive signal 211～214,221～224 with staggered driven for emitting lights diode LED1, LED2 according to sub-update cycle 1-1～1-4,2-1～2-4.By drive signal 210,220 being divided into a plurality of sub-drive signals 211～214,221～224, the picture update rate of light-emitting diode display just can obtain to promote.
In addition, driving data DIN, the clock signal DCK that drive circuit 120 among above-mentioned Fig. 4 and Fig. 5 is received, bolt-lock signal LAT, sweep signal SCAN and GTG control signal GCK can be provided to drive circuit 120 or by the outside by controller 110 and provide to drive circuit 120, and present embodiment is not limited.Please refer to Fig. 6 A, Fig. 6 A is the drive unit schematic diagram according to the light-emitting diode of second embodiment of the invention, and its middle controller 110 transmits driving data DIN, clock signal DCK, GTG control signal GCK and sweep signal SCAN to drive circuit 120.In another embodiment of the present invention, shown in Fig. 6 B, its middle controller 110 transmission driving data DIN, clock signal DCK and GTG control signal GCK are to drive circuit 120, and drive circuit 120 can produce sweep signal SCAN by GTG control signal GCK.Please refer to Fig. 6 C, Fig. 6 C is depicted as the circuit framework of the drive circuit 120 among Fig. 6 B.The main difference of the circuit framework of Fig. 6 C and Fig. 5 is that counting unit 617 can directly produce sweep signal SCAN according to GTG control signal GCK and give selection circuit 414.After via exposure of the present invention, the present technique field has knows that usually the knowledgeable should know its execution mode easily by inference, does not add tired stating at this.
The 3rd embodiment
In the driving wafer of light-emitting diode, GTG control signal GCK can be used to control the GTG value of picture, sweep signal SCAN then is that drive unit can directly utilize GTG control signal GCK or sweep signal SCAN to carry out picture black frame insertion (black insertion) to improve ghost phenomena in order to the decision scanning sequency.Please refer to Fig. 7 and Fig. 8, Fig. 7 and Fig. 8 are the picture black frame insertion signal schematic representation according to third embodiment of the invention.Please be simultaneously with reference to Fig. 1, controller 110 can be via sweep signal SCAN control Driver Circuit 120 output black frame insertion signals, as shown in Figure 7.Drive unit can insert a black picture 710 between the adjacent sub-update cycle (as sub-update cycle 1-1 and sub-update cycle 2-1), this black picture 710 produces the subject of knowledge and the object of knowledge by sweep signal SCAN.When drive circuit 120 receives the sweep signal SCAN waveform of expression black plug (for example when sweep signal SCAN is high levle), drive circuit 120 just can be exported black frame insertion signals and produce black picture 710.Please refer to Fig. 8, Fig. 8 is black frame insertion signals schematic diagram according to another embodiment of the present invention.In Fig. 8, controller 110 can be via GTG control signal GCK control Driver Circuit 120 output black frame insertion signals to produce black picture 810, this black picture 810 produces the subject of knowledge and the object of knowledge by the GTG control signal GCK with specific wave mode, its waveform that enables can be decided according to design requirement, is not limited to Fig. 8.When drive circuit 120 receives the waveform of the GTG control signal GCK that represents black plug,, drive circuit 120 produces black picture 810 just can exporting black frame insertion signals (as 0 GTG).The GTG control signal GCK of Fig. 8 is applicable to for example drive circuit of Fig. 6 C, its counting unit 617 can produce inner sweep signal SCAN so that selected cell 414 stops to export the driving data according to GTG control signal GCK, by this, output unit 416 just can be exported black frame insertion signals.The waveform of the GTG control signal GCK of black plug is not limited to Fig. 8, for example is made up of the short pulse of two cycles.
In addition, it should be noted that black frame insertion signals can utilize different modes to produce, for example make drive circuit 120 anergies, present embodiment is not limited, after via exposure of the present invention, the present technique field has knows that usually the knowledgeable should know its execution mode easily by inference, does not add tired stating at this.
The 4th embodiment
The foregoing description can be summarized a kind of driving method of light-emitting diode, please refer to Fig. 9, and Fig. 9 is the driving method according to the light-emitting diode of fourth embodiment of the invention, is applicable to drive at least one first light emitting diode and one second light emitting diode.At first, receive and store a driving data, this driving data comprises one first data and one second data, and first data is corresponding to one first drive signal, and second data is corresponding to one second drive signal.First data corresponds respectively to different LED unit (as the LED tandem) (step S910) with second data.Then, first drive signal is divided into a plurality of first sub-drive signal, second drive signal is divided into a plurality of second sub-drive signal (step S920), and the then staggered output first sub-drive signal and the second sub-drive signal are with staggered first light emitting diode and second light emitting diode (step S930) of driving.
The partitioning scheme of first drive signal and second drive signal please refer to Fig. 2, and the output timing of its first sub-drive signal and the second sub-drive signal please refer to Fig. 3.All the other details of operations of this driving method please refer to the explanation of above-mentioned first to fourth embodiment, do not add tired stating at this.
In sum, the present invention is divided into a plurality of sub-drive signals with the drive signal of light-emitting diode, comes the staggered plural light emitting diode that drives with interlace mode output then, can provide picture update rate by this.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (15)
1. the drive unit of a light-emitting diode is applicable to drive at least one first light emitting diode and one second light emitting diode, it is characterized in that this drive unit comprises:
One data transfer unit, in order to receive and to store a driving data, this driving data comprises one first data and one second data, and this first data is corresponding to one first drive signal, and this second data is corresponding to one second drive signal; And
One driver element is coupled to this data transfer unit, drives this first light emitting diode according to this first data, drives this second light emitting diode according to this second data;
Wherein, this driver element is divided into a plurality of first sub-drive signal with this first drive signal, this second drive signal is divided into a plurality of second sub-drive signal, and the staggered then output described first sub-drive signal and the described second sub-drive signal are with staggered this first light emitting diode and this second light emitting diode of driving.
2. drive unit according to claim 1, it is characterized in that, wherein this driver element is divided into a plurality of first sub-update cycle and a plurality of second sub-update cycle with a frame updating periodic region, the described first sub-update cycle and the described second sub-update cycle are interconnected, and this driver element respectively in the described first sub-update cycle output the described first sub-drive signal, and respectively in the described second sub-update cycle output the described second sub-drive signal.
3. drive unit according to claim 2 is characterized in that, the wherein said first sub-update cycle is non-conterminous mutually, and the described second sub-update cycle is non-conterminous mutually.
4. drive unit according to claim 1 is characterized in that, wherein this driver element comprises:
One first storage element is coupled to this data transfer unit, in order to store this first data; And
One second storage element is coupled to this data transfer unit, in order to store this second data.
5. drive unit according to claim 4 is characterized in that, wherein this driver element also comprises:
One selects circuit, is coupled to this first storage element and this second storage element, exports this first data or this second data in order to selectivity;
One pulse wave dnsity modulation unit is coupled to the output of this selection circuit, produces a plurality of sub-work periods according to the output and a count signal of this selection circuit;
One output unit is coupled to this pulse wave dnsity modulation unit, produces the described first sub-drive signal and the described second sub-drive signal according to the described sub-work period; And
One counting unit is coupled to this pulse wave dnsity modulation unit, in order to export this count signal.
6. drive unit according to claim 4 is characterized in that, wherein this driver element also comprises:
One first pulse wave dnsity modulation unit is coupled to this first storage element, exports for a plurality of first sub-work period according to this first data and one first count signal;
One second pulse wave dnsity modulation unit is coupled to this second storage element, exports for a plurality of second sub-work period according to this first data and one second count signal;
One selected cell is coupled to this first pulse wave dnsity modulation unit and this second pulse wave dnsity modulation unit, exports the described first sub-work period or the described second sub-work period in order to selectivity;
One output unit is coupled to this selected cell, produces the described first sub-drive signal according to the described first sub-work period, produces the described second sub-drive signal according to the described second sub-work period; And
One counting unit is coupled to this first pulse wave dnsity modulation unit and this second pulse wave dnsity modulation unit, and exports this first count signal and this second count signal respectively.
7. drive unit according to claim 1 is characterized in that, also comprises:
One first switch is coupled between the end and an operating voltage of this first light emitting diode;
One second switch is coupled between the end and this operating voltage of this second light emitting diode; And
In order to the conducting of controlling this first switch and this second switch whether one controller is coupled to this first switch, this second switch, this data transfer unit and this driver element.
8. drive unit according to claim 1 is characterized in that, also comprises:
One first switch is coupled between the end and this driver element of this first light emitting diode, and the other end of this first light-emitting diode is coupled to an operating voltage;
One second switch is coupled between the end and this driver element of this second light emitting diode, and the other end of this second light-emitting diode is coupled to this operating voltage; And
In order to the conducting of controlling this first switch and this second switch whether one controller is coupled to this first switch, this second switch, this data transfer unit and this driver element.
9. drive unit according to claim 1 is characterized in that, wherein this driver element more in adjacent respectively this first sub-drive signal and respectively between this second sub-drive signal output one black frame insertion signals.
10. drive unit according to claim 1 is characterized in that, wherein this first light emitting diode is made up of the individual individual light-emitting diode that is connected in series of M that reaches of N respectively with this second light emitting diode, and wherein N and M are positive integer.
11. drive unit according to claim 1 is characterized in that, wherein this data transfer unit and this driver element system is integrated among the one drive circuit.
12. the driving method of a light-emitting diode is applicable to drive at least one first light emitting diode and one second light emitting diode, it is characterized in that this driving method comprises:
Reception also stores a driving data, and this driving data comprises one first data and one second data, and this first data is corresponding to one first drive signal, and this second data is corresponding to one second drive signal;
This first drive signal is divided into a plurality of first sub-drive signal, this second drive signal is divided into a plurality of second sub-drive signal; And
The staggered output described first sub-drive signal and the described second sub-drive signal are with staggered this first light emitting diode and this second light emitting diode of driving.
13. driving method according to claim 12 is characterized in that, also comprises:
One frame updating periodic region is divided into a plurality of first sub-update cycle and a plurality of second sub-update cycle, the described first sub-update cycle and the described second sub-update cycle are interconnected, then respectively at the output described first sub-drive signal in the described first sub-update cycle, and respectively at the output described second sub-drive signal in the described second sub-update cycle.
14. driving method according to claim 13 is characterized in that, the wherein said first sub-update cycle is non-conterminous mutually, and the described second sub-update cycle is non-conterminous mutually.
15. driving method according to claim 12 is characterized in that, also comprises:
In adjacent respectively this first sub-drive signal and respectively between this second sub-drive signal output one black frame insertion signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010149992.6A CN102215620B (en) | 2010-04-08 | 2010-04-08 | Device and method for driving light-emitting diode (LED) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010149992.6A CN102215620B (en) | 2010-04-08 | 2010-04-08 | Device and method for driving light-emitting diode (LED) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102215620A true CN102215620A (en) | 2011-10-12 |
| CN102215620B CN102215620B (en) | 2014-05-28 |
Family
ID=44746676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010149992.6A Active CN102215620B (en) | 2010-04-08 | 2010-04-08 | Device and method for driving light-emitting diode (LED) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102215620B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996375A (en) * | 2014-05-13 | 2014-08-20 | 广东威创视讯科技股份有限公司 | Method and circuit for improving refresh rate of LED display screen |
| CN105517242A (en) * | 2015-12-29 | 2016-04-20 | 生迪智慧科技有限公司 | Light-emitting module control device |
| CN106028539A (en) * | 2016-06-28 | 2016-10-12 | 浙江生辉照明有限公司 | Light-emitting module control device |
| CN114429756A (en) * | 2021-12-31 | 2022-05-03 | 上海矽力杰微电子技术有限公司 | Backlight scanning method, backlight driver and display device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050212459A1 (en) * | 2004-03-26 | 2005-09-29 | Patel Sanmukh M | System and method for driving a plurality of loads |
| CN101009957A (en) * | 2006-01-24 | 2007-08-01 | 聚积科技股份有限公司 | LED driving integrated circuit device with the adjustable pulse bandwidth |
| CN101162563A (en) * | 2007-11-26 | 2008-04-16 | 友达光电股份有限公司 | Backlight control device and method used for controlling drive current of luminous diode |
| CN101187754A (en) * | 2006-11-15 | 2008-05-28 | 晶宏半导体股份有限公司 | Energy-saving mode light source set |
-
2010
- 2010-04-08 CN CN201010149992.6A patent/CN102215620B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050212459A1 (en) * | 2004-03-26 | 2005-09-29 | Patel Sanmukh M | System and method for driving a plurality of loads |
| CN101009957A (en) * | 2006-01-24 | 2007-08-01 | 聚积科技股份有限公司 | LED driving integrated circuit device with the adjustable pulse bandwidth |
| CN101187754A (en) * | 2006-11-15 | 2008-05-28 | 晶宏半导体股份有限公司 | Energy-saving mode light source set |
| CN101162563A (en) * | 2007-11-26 | 2008-04-16 | 友达光电股份有限公司 | Backlight control device and method used for controlling drive current of luminous diode |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996375A (en) * | 2014-05-13 | 2014-08-20 | 广东威创视讯科技股份有限公司 | Method and circuit for improving refresh rate of LED display screen |
| CN103996375B (en) * | 2014-05-13 | 2016-06-29 | 广东威创视讯科技股份有限公司 | Improve method and the circuit of LED display refresh rate |
| CN105517242A (en) * | 2015-12-29 | 2016-04-20 | 生迪智慧科技有限公司 | Light-emitting module control device |
| CN106028539A (en) * | 2016-06-28 | 2016-10-12 | 浙江生辉照明有限公司 | Light-emitting module control device |
| CN114429756A (en) * | 2021-12-31 | 2022-05-03 | 上海矽力杰微电子技术有限公司 | Backlight scanning method, backlight driver and display device |
| CN114429756B (en) * | 2021-12-31 | 2024-02-23 | 上海矽力杰微电子技术有限公司 | Backlight scanning method, backlight driver and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102215620B (en) | 2014-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102054434B (en) | Light-emitting diode (LED) display system and method having pulse scattering mode | |
| US8199080B2 (en) | Display device having a plurality of data signal driving means and method for same | |
| US20160118026A1 (en) | Drive method and system for led display panel | |
| CN101246669B (en) | Scanning type LED display unit and method | |
| CN1326175A (en) | Modulating circuit, image display therewith and modulating method | |
| CN103247254A (en) | Display device and arranging method for image data thereof | |
| CN102087834A (en) | Method and apparatus for LED driver color-sequential scan | |
| CN105206228B (en) | The LED scanning arrays driving chip and adjusting method that brightness linear change is voluntarily adjusted | |
| CN103165075B (en) | Driving circuit of light emitting diode and method thereof | |
| CN102006696B (en) | Light-emitting diode backlight drive circuit, method and constant current source thereof | |
| CN109686320A (en) | Backlight module and its driving method, display device | |
| CN102215620B (en) | Device and method for driving light-emitting diode (LED) | |
| CN102629458A (en) | Backlight circuit, backlight panel and light emitting diode driver | |
| CN102411897A (en) | LED display system having pulse scattering mode and method thereof | |
| CN101447174B (en) | Display method for color sequential display | |
| CN103813579B (en) | Light emitting diode driving circuit and driving system of light emitting diode | |
| CN110148373B (en) | Display panel, display device and driving method of display panel | |
| CN104050909A (en) | Display device and scanning line driver | |
| CN104424888A (en) | Display panel, method of driving the same, and electronic apparatus | |
| CN115968492A (en) | Display driving circuit and method, LED display panel and display device | |
| TWI507079B (en) | Driving apparatus of light emitting diode and driving method thereof | |
| CN103582221B (en) | Light emitting diode driving circuit, driving system and driving method thereof | |
| CN108962132B (en) | LED display device and main controller and control method thereof | |
| CN203288216U (en) | Energy-efficient LED screen dynamic-scanning apparatus and energy-efficient LED screen | |
| CN202799283U (en) | Light emitting diode driving circuit and driving system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |