CN103971642A - Led display screen driving method and led power supply control circuit - Google Patents
Led display screen driving method and led power supply control circuit Download PDFInfo
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- CN103971642A CN103971642A CN201410214499.6A CN201410214499A CN103971642A CN 103971642 A CN103971642 A CN 103971642A CN 201410214499 A CN201410214499 A CN 201410214499A CN 103971642 A CN103971642 A CN 103971642A
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Abstract
The invention provides an LED display screen driving method and an LED power supply control circuit. In a clearance between every two lines of a driven LED display screen, spurious charges of output power parts on the lines of the LED display screen driven just now are controlled to be removed, so that the problem of ghosting, the caterpillar phenomenon and the problem of cross curves in the scanning of the LED display screen are solved fully, and the display effect of the LED display screen is greatly improved; meanwhile, the problem that a power supply chip is easily burnt out due to the fact that the power supply chip is not provided with a protective circuit and the problems of wiring performance and efficiency are solved.
Description
Technical field
The present invention relates to LED display driver field, refer in particular to a kind of LED display driving method and LED power control circuit.
Background technology
At present in LED display, be mainly divided into static display screen and two kinds of scanning display screens.
Wherein, the static display screen of LED is that each picture element (three color dot R/G/B) LED has one independently to drive chip output control terminal, and all view data whole screen in a frame shows simultaneously.
LED scanning display screen refers to that continuous a few row pixel (three color dot R/G/B) LED shares one and drives chip output control terminal, and these several row are again by certain scanning sequence, and power supply successively, finally reaches the object that shows complete image.Give an example: taking 1/32 scanning as example, first a frame time is divided into 32 parts, within the 0-1/32 time, first shows the first row, in the 1/32-2/32 time, just show the second row, by that analogy, in the last 31/32-32/32 time, show the 32nd row, complete a frame and show.
Comparing above-mentioned two kinds of LED display, because the whole view data of LED scanning display screen is not to show simultaneously, is above-mentioned example equally, and the power consumption that means 1/32LED scanning display screen under the equal peak point current of R/G/B LED is only 1/32 of the static display screen of LED.Although the brightness of the display screen of LED scanning simultaneously also approximately only has 1/32 of the static display screen of LED.But because sharing a road, multirow in LED scanning display screen drives chip output control terminal, so its constant-current control circuit will greatly reduce, use and drive chip also to greatly reduce, cost also just decreases, and therefore the display screen of LED scanning in the last few years becomes the market mainstream gradually.
It is the LED scanning display screen schematic diagram of 32 scan lines in a prior art referring to Fig. 1, in figure, scanning decoding scheme is address decoder, line of input address signal is decoded as and controls driving signal, and power control circuit is controlled and is exported successively LED array anode V1 (the 1st row)-V32 (the 32nd row) voltage.
See that again Fig. 2 is the corresponding 32 scan line LED scanning display screen ideal source output timing diagrams of Fig. 1, its principle of work is that every row power supply V1-V32, by each 1/32 time in frame period of unlatching of control requirement, and exports row voltage from the 1st row to the 32 row line by line within the l two field picture display cycle.But in reality, due to the existence of spurious charge, power supply V1-V32 rising edge and negative edge can be haggled over slowly.Practical power output timing diagram as shown in Figure 3, the 1st row power supply wave shape V1 negative edge, its negative edge T_falling is by about 300ns, the 2nd row power supply wave shape V2 rising T_rising is along the about 200ns of rising, thus, the 1st row and the 2nd guild have an appointment the overlapping time (drop to 50% to second row with the first row and rise to 50% calculating) of 150ns.For ease of analytical calculation, we can be approximately T_overlap overlapping time rising time 1/2*T_falling.That is: T_overlap=1/2*T_falling=150ns.Visible, in reality, in the time that scanning shows the 2nd row data, previous row (the 1st row) still can be luminous with the control mode of the 2nd row within the T_overlap time, if it is bright that the data of the 2nd row are lamps, in beholder's vision, will see that so previous row is slightly shinny.The size of brightness is directly proportional to the ratio of displaying time to two row overlapping time, is directly proportional to T_overlap/T_line.Here we definition of T _ overlap/T_line is overlap ratio, also taking 50Hz frame frequency as example, and T_overlap/T_line=150/625=24%.Under so high overlap ratio, conditions of streaking will be fairly obvious, and meanwhile, if improve frame per second, conditions of streaking is more serious.LED display just there will be the ghost that is commonly called as in industry (or caterpillar, cross curve) phenomenon on showing thus.This ghost phenomenon is formally due to the existence of spurious charge, and the LED of scanning neighbor two row there will be and shows situation about interfering with each other, and has therefore greatly affected display effect.
In addition, tradition can find out from Fig. 1,4, and the line control that uses scanning decoding scheme to output to power control circuit during traditional LED scanning display screen drives drives signal, and the fundamental sum number of scanning lines is consistent, such as sweeping on LED scanning display screen 1/32, must walk 32 lines.This just makes when in the situation of LED scanning display screen pitch smaller, and pcb board wiring space becomes in close situation, control drive signal number, directly can affect performance and the efficiency of wiring.
Moreover when the display screen of LED scanning now drives, neighboring power wires, if there is overlapping phenomenon, not only can cause ghost, but also can burn pcb board and power supply control chip, is therefore short of to some extent in working stability degree, fiduciary level.
Summary of the invention
Technical matters to be solved by this invention is: eliminate the ghost occurring in LED scanning display screen driving process; thereby raising display effect solves power supply chip owing to not having holding circuit easily to burn and pcb board wiring performance is not good and the not high problem of efficiency simultaneously.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of LED display driving method, and it comprises: the row actuation step that driving LED display screen powers on line by line; In the row driving time gap of every two row of driving LED display screen, driving LED display screen is completed to the electric charge removal process that the spurious charge of the row of scanning is released.
The invention still further relates to a kind of LED power control circuit, it comprises control module and drives blanking module; Described driving blanking unit comprises many group switch elements and blanking unit; Described switch element is provided with power input, LED display row drive output and control end; The control end of described switch element is connected with control module; Described blanking unit is provided with input end, release end and Enable Pin, and the input end of blanking unit is connected with the LED display row drive output of switch element, the end ground connection of releasing, and Enable Pin is connected with control module; Described control module, for controlling one by one the control end that drives every group of switch element of blanking module, thereby the row that driving LED display screen powers on line by line drives, and in the row driving time gap of every two row of driving LED display screen, release to ground thereby enable the spurious charge that driving LED display screen completes the row of scanning by the Enable Pin of blanking unit in this group.
Beneficial effect of the present invention is: in the gap of every two row of driving LED display screen, the spurious charge of out-put supply part on the row of the complete LED display of firm driving of releasing, thereby the problem that can completely solve ghost, caterpillar, cross curve in LED scanning display screen, significantly improves LED display display effect.
Brief description of the drawings
Below in conjunction with accompanying drawing in detail concrete structure of the present invention is described in detail
Fig. 1 is traditional 32 scan line LED scanning display drive circuit schematic diagram in prior art;
Fig. 2 is the desirable output timing diagram that in prior art, traditional 32 scan line LED scanning display screens drive;
Fig. 3 is the actual output timing diagram that in prior art, traditional 32 scan line LED scanning display screens drive;
Fig. 4 is that in prior art, traditional 32 scan line LED scanning display screens pass through the LED power control circuit cascade schematic diagram of 138 code translators;
Fig. 5 is the circuit module schematic diagram of LED power control circuit of the present invention;
Fig. 6 is the circuit module schematic diagram of the displacement latch of LED power control circuit of the present invention;
Fig. 7 is an embodiment circuit diagram of the control module of LED power control circuit of the present invention;
Fig. 8 is an embodiment circuit diagram of the protection module of LED power control circuit of the present invention;
Fig. 9 is the cascade schematic diagram of LED power control circuit of the present invention;
Figure 10 is that LED display of the present invention drives sequential chart.
Embodiment
By describing technology contents of the present invention, structural attitude in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
The design of most critical of the present invention is: by the upper spurious charge of row in LED scanning display screen driving process is released, thereby the ghost that the row of avoiding electric charge to leave over caused LED scanning display screen is lit produces.In addition, improved LED power control circuit, between multiple LED power control circuits that multirow is driven, only needed an input data signal, all the other can complete successively line scanning by serial connection mode and drive, and then simplify product wiring complexity.In addition, avoid producing overlapping power supply phenomenon to adding logical operation circuit before the outputting data signals of each LED power control circuit, having protected.
First the present invention provides a kind of LED display driving method, and it comprises,
The row actuation step that driving LED display screen powers on line by line;
In the row driving time gap of every two row of driving LED display screen, driving LED display screen is completed to the electric charge removal process that the spurious charge of the row of scanning is released.
From foregoing description, beneficial effect of the present invention is: in the gap of every two row of driving LED display screen, the spurious charge of out-put supply part on the row of the complete LED display of firm driving of releasing, thereby the problem that can completely solve ghost, caterpillar, cross curve in LED scanning display screen, significantly improves LED display display effect.
Embodiment 1:
In the row actuation step of said method, in the time receiving input data signal, occur that at interval input signal in the process of rising edge, carrying out appears to interval input signal in negative edge.
In the present embodiment, the step that row drives is opened according to external trigger, and trigger condition is determined by input data signal and interval input signal.Can in the time having input data signal, adjust easily easily row driving time by the method.
Embodiment 2:
In the electric charge removal process of said method, the spurious charge that driving LED display screen is completed to the row of scanning according to trigger pip is released.
In the present embodiment, electric charge removal process is controlled by trigger pip, be that the release length of time of spurious charge also can further accurately be controlled by outer triggering signal in the row driving time gap of every two row of driving LED display screen, to meet the adjustment demand of different situations in practical application.
Embodiment 3:
The present embodiment further provides a kind of specific embodiment of electric charge removal process, specifically comprises the steps:
S1), at least two latches of initialization are output as low level/high level; Described latch output is corresponding with the line number that driving LED display screen drives;
S2), receive input data signal;
S3), clock signal to be shifted is while occurring, and first latch output is become to high level/low level;
S4), clock signal to be shifted is while again occurring, current latch output is become to low level/high level and next latch output is become to high level/low level;
S5), the row of the lastrow of LED display to be driven drives and finishes to perform step S6 between shift clock signal occurs again;
S6) row that, the current row of exporting corresponding LED display for high level/low level latch is completed to scanning as driving LED display screen carries out spurious charge and releases.
The present embodiment provides a kind of and at least LED display two row has been driven and method that electric charge is eliminated, drives with electric charge and eliminates according to the input data signal of outside input, shift clock signal and come orderly unlatching, control.
Embodiment 4:
Further, on the basis of embodiment 3, the specific embodiment that row drives can adopt: when clock signal to be shifted and interval input signal disappear simultaneously and again occur to interval input signal, the current row that is corresponding LED display is exported in high level/low level latch drives.
In the present embodiment, LED shows that the triggering that row frequently drives determines according to shift clock signal and interval input signal simultaneously.
Thus, during whole LED display drives, no matter be that row actuation step or electric charge removal process only need can organically be realized control by shift clock signal and two signals of interval input signal, greatly simplified the complexity that LED display drives.
The present invention also provides a kind of LED power control circuit, and as shown in Figure 5, it comprises control module and drives blanking module; Described driving blanking unit comprises many group switch elements and blanking unit; Described switch element is provided with power input, LED display row drive output and control end; The control end of described switch element is connected with control module; Described blanking unit is provided with input end, release end and Enable Pin, and the input end of blanking unit is connected with the LED display row drive output of switch element, the end ground connection of releasing, and Enable Pin is connected with control module;
Described control module, for controlling one by one the control end that drives every group of switch element of blanking module, thereby the row that driving LED display screen powers on line by line drives, and in the row driving time gap of every two row of driving LED display screen, release to ground thereby enable the spurious charge that driving LED display screen completes the row of scanning by the Enable Pin of blanking unit in this group.
From foregoing description, beneficial effect of the present invention is: carry out line scanning by switch element driving LED display screen, further in the gap of every two row, thereby the control by blanking unit is by the spurious charge of out-put supply part on the row of the LED display just the having driven ground of releasing, thereby the problem that can completely solve ghost, caterpillar, cross curve in LED scanning display screen, significantly improves LED display display effect.
Embodiment 1:
In said structure, the switch element of every group of described driving blanking module comprises the first metal-oxide-semiconductor; Blanking unit comprises the second metal-oxide-semiconductor and bleeder resistance, and described bleeder resistance connects releasing between end and ground of the second metal-oxide-semiconductor.
In the present embodiment, adopt metal-oxide-semiconductor respectively as the gate-controlled switch on row driving and charge discharging resisting path, have the advantage that power-carrying is larger.
Embodiment 2:
In said structure, described control module is provided with interval input signal end and shift clock signal end.Control module is to control output according to interval input signal and the shift clock signal of input thus.
Embodiment 3:
Further LED power control circuit also comprises displacement latch, and displacement latch is provided with input data signal end, shift clock signal end, the first latch output terminal and the second latch output terminal; Described driving blanking module comprises two groups of switch elements and blanking unit; The first latch output terminal of described shift register and the defeated link control module of the second latch.
As shown in Figure 6, described displacement latch comprises the first trigger and the second trigger, described shift clock signal end connects respectively the input end of the first trigger and the second trigger, the first trigger input also connects the input of input data signal end, output connection the first latch output terminal and the second trigger, and the second trigger output connects the second latch output terminal;
As shown in Figure 7, described control module comprise first or door, first with door, second or door and second and;
Input data signal latch, displacement and then the triggering as driving double switch unit of displacement latch to input;
Described first or door forward input connect interval input signal end, shift clock signal end and the second latch output terminal, oppositely input connects the first latch output terminal, output connects the control end of first group of switch element;
Described first is connected interval input signal end and the first latch output terminal with the forward input of door, and oppositely input connects shift clock signal end and the second latch output terminal, and output connects the Enable Pin of first group of blanking unit;
Described second or the forward input of door connect interval input signal end, the first latch output terminal and shift clock signal end, oppositely input the second latch output terminal, output connects the control end of second group of switch element;
Described second inputs interval input signal end and the second latch output terminal with door forward, oppositely inputs shift clock signal end and the first latch output terminal, and output connects the Enable Pin of second group of blanking unit.
What the present embodiment provided is one can provide the LED display circuit structure that two row drive, and it by displacement latch, the input signal of input is carried out to latch and then formation the first latch is exported, the second latch output can make control module only adopt simple logical circuit just to realize the control to two row drivings, charge discharging resisting in conjunction with the control of interval input signal and shift clock signal.
Thereby the logical circuit adopting by control module in the present embodiment in addition and displacement latch save the required scanning decoding scheme of traditional LED scanning display screen, greatly simplify the design of PCB cabling.
Embodiment 4:
Further LED power control circuit also comprises protection module; as shown in Figure 8; described protection module comprise the 3rd not gate and the 3rd with door; the input of described the 3rd not gate connects the first latch output terminal; output connects the 3rd and inputs with door; the 3rd is also connected with the second latch output terminal with door input, and output is connected with outputting data signals end.Thus, by adding protection module, thereby can ensure to occur can not burn when abnormal chip and circuit.
Provide a concrete example with regard to technical scheme of the present invention below:
A kind of LED power control circuit that this example provides, be illustrated in figure 5 a single module and comprise two-way power control circuit (V1/V2), really, the present invention program is not limited to two-way power control circuit, and principle can be applied for multiple power supplies control circuit.
Concrete; this example LED power control circuit comprises control module (CONTROLER), driving blanking module, the protection module of displacement latch (D1/D2), logical type; control sequential and be according to interval input signal BLANK, shift clock signal CLOCK, input data signal DATAIN Deng San road input logic signal and system power supply VCC, GND, and the output signal such as outputting data signals DATAOUT, the 1st row power supply V1, the 2nd row power supply V2.
Thus, the function that above-mentioned device can be realized is as follows:
Wherein, the displacement storage D1/D2 of institute as shown in Figure 6, by input shift clock signal CLOCK, by input data signal DATAIN, serial-shift, latch form the first latch output Q1 and the second latch output Q2 output to first trigger D1/ the second trigger D2 respectively, wherein shift clock signal CLOCK input adopts upper pull-up structure, in the time there is no input signal will by move high level VCC to.
The control module CONTROLER of logical type as shown in Figure 5, by the output Q1/Q2 process logical operation of input interval input signal BLANK, input shift clock signal CLOCK and the displacement storage D1/D2 of institute, output CTRL1/CTRL2/DISCHARGE1/DISCHARGE2,1/ blanking unit 2, gauge tap pipe 1/ switching tube 1/ blanking unit respectively, wherein input pull-up structure in the input signal BLANK employing of interval, in the time there is no input signal will by move high level VCC to.
Drive the blanking part in blanking module to include blanking unit 1, blanking unit 2 and bleeder resistance, for the spurious charge on the out-put supply of releasing (V1/V2).
Protection module as shown in Figure 7, utilizes Q2 and Q1 negate to carry out and operation, output outputting data signals DATAOUT.
If multichannel cascade, can take cascade successively shown in Fig. 9, i.e. the displacement latch of first LED power control circuit input input data signal, its outputting data signals is as the input data signal of second LED power control circuit, by that analogy.
The control method of foregoing circuit and principle:
In order to realize control, its crucial need produces blanking and drive control signal as shown in figure 10: CTRL1/CTRL2/DISCHARGE1/DISCHARGE2, thus driving LED display screen line and realize blanking control function in gap in due course.Below illustrate:
In this example, the input signal of entirety is reduced to tri-of DATAIN/BLANK/CLOCK, and the control signal of output is CTRL1/CTRL2/DISCHARGE1/DISCHARGE2; Q1/Q2 is M signal.
In above-mentioned, input data signal DATAIN is periodic signal, and it is consistent with LED scanning display screen frame rate.In the time that starting to scan, the first row of each frame sends once, if LED scanning display screen is 32 to sweep, the first row of DATAIN within 32 horizontal-scanning intervals sends once sweep time, and the first row scanning in next 32 horizontal-scanning intervals sends for the second time again, and pulse width is not more than line period and is advisable;
In above-mentioned, interval input signal BLANK is periodic signal, and it is also consistent with LED scanning display screen line frequency, and every row sends once, for the sigtnal interval.Wherein BLANK negative edge aligns with DATAIN negative edge, and pulse width is not more than 1/2 line period and is advisable.
In above-mentioned, displacement clock signal C LOCK is periodic signal, and consistent with LED scanning display screen line frequency, every row sends once, for displacement.Wherein CLOCK negative edge aligns with DATAIN negative edge, ensure the upper high level along sampling DATAIN signal of the first row CLOCK, and the rising edge of CLOCK is later than the rising edge of BLANK simultaneously.
And the purposes of CTRL1/CTRL2/DISCHARGE1/DISCHARGE2 is:
1, when CTRL1 is low level, when DISCHARGE1 is also low level, switching tube 1 is PMOS switch, and now switching tube 1 is opened, and system power supply is transferred to the 1st row power supply V1 through switching tube 1, is now the 1st row power supply V1 working time;
2, when CTRL1 is high level, when DISCHARGE1 is also high level.Switching tube 1 is PMOS switch, and now switching tube 1 is closed, and system power supply can not be transferred to the 1st row power supply V1, and meanwhile, blanking unit 1 is nmos switch, and now blanking unit 1 is opened, and the residual charge on the 1st row power supply V1 is released to zero;
3, when CTRL1 becomes high level again, when DISCHARGE1 is low level, now switching tube 1 is closed, and blanking unit 1 is closed, and the 1st row power supply V1 is high-impedance state;
4, last, after one section of time delay, the 2nd row power supply V2 repeats the process of similar the 1st row power supply V1, that is, normally work, and the residual charge of releasing, three processes of high resistant.
Further tetra-control signals of CTRL1/CTRL2/DISCHARGE1/DISCHARGE2 obtain by logical operation based on above-mentioned three signals, and producing method is:
By displacement latch (D1/D2), utilize shift clock signal CLOCK, input data signal DATAIN is input to successively to the output terminal Q1/Q2 of D1/D2, and the calculating of process logic control circuit, obtain the control signal CTR1/CTR2/DISCHARGE1/DISCHARGE2/ of power supply switch tube/blanking circuit, control power supply output (V1/V2), utilize the drainage function of 1/ blanking unit 2, blanking unit simultaneously, out-put supply be there is not in the time switching to overlapping situation, reach blanking effect, Q1/Q2 is through protection module simultaneously, make to play a protective role in the time that input serial data makes a mistake.
When DATAIN high impulse comes, mean that LED scanning display screen the 1st row power supply is by work, in the time that CLOCK rising edge (T1 moment) samples DATAIN high level, as shown in Figure 5, the first trigger D1/D2 in displacement latch, will export high level successively, Q1/Q2 as shown in figure 10, in the T1 moment, Q1 is output as high level, and Q2 still keeps low level; When second CLOCK rising edge (T4 moment), Q1 output just becomes low level, and Q2 output will become high level; In the time that the 3rd CLOCK rising edge comes, Q1/Q2 output becomes low level together, and the latch (D1/D2) that is shifted so is just realized data displacement latch function.
Logic control circuit as shown in Figure 7, carries out logical operation by BLANK/CLOCK/Q1/Q2, obtains following result:
CTRL1＝BLANK+CLOCK+(～Q1)+Q2
DISCHARGE1＝BLANK*(～CLOCK)*Q1*(～Q2)
CTRL2＝BLANK+CLOCK+Q1+(～Q2)
DISCHARGE2＝BLANK*(～CLOCK)*(～Q1)*Q2
As can see from Figure 10,
In the T2 moment, CTRL1 is low level, and switching tube 1, for PMOS pipe, now will be opened, and system power supply VCC will output to the 1st row power supply V1, and DISCHARGE1 is low, and blanking unit 1, for NMOS pipe, is not opened, and keeps high-impedance state, there will not be discharging function;
In the T3 moment, LED scanning display screen the 1st row turn-offs, and carries out the blanking stage, and CTRL1 becomes high level, switching tube 1 is PMOS pipe, now will close, switching tube 1 will become high-impedance state, and DISCHARGE1 becomes high level, blanking unit 1 is NMOS pipe, will open, the electric charge of the 1st row power supply V1 storage is discharged, V1 is pulled down to low level;
In the T4 moment, LED scanning display screen the 1st row turn-offs the blanking stage, CTRL1 is high level, and switching tube 1, for PMOS pipe, is now closed, switching tube 1 will keep high-impedance state, DISCHARGE1 becomes low level, and blanking unit 1, for NMOS pipe, will be closed, NMOS1 is also in high-impedance state, and V1 keeps high resistant;
T4 is to (the shift clock signal CLOCK high level time of the time between T5,) can be seen as be that the blanking of the first row power supply finishes to start working to the second row power supply output, can ensure that the blanking of the first row power supply and the normal work of the second row power supply do not have sequential overlapping;
In the T5 moment, repeat the operation of the 1st row, CTRL2 is low level, switching tube 2 is PMOS pipe, now will open, system power supply VCC will output to the 2nd row power supply V2, and DISCHARGE2 is low, and blanking unit 2 is NMOS pipe, do not open, keep high-impedance state, there will not be discharging function;
Successively, the 2nd row repeats to open blanking, turn-offs blanking and keeps the state of high resistant, completes unlatching, blanking, the high resistant process of the 2nd row power supply output.
From describing and can know above, the 1st row power supply V1 and the 2nd row power supply V2 experience the process of opening, turn-offing also blanking, turn-offing blanking maintenance high resistant.It should be noted that; the 1st row power supply V1 and the 2nd row power supply V2 are owing to there being the existence of BLANK, CLOCK signal; there will not be the situation of simultaneously opening V1/V2, so avoided the ghost of original LED scanning display screen to occur, complete blanking and the defencive function of LED scanning display screen.
Simultaneously, when above-mentioned LED power control circuit will drive multirow LED display, can adopt cascade system, as shown in Figure 9, by built-in displacement latch, only need a line, from N circuit (chip) DATAOUT pin to N+1 circuit (chip) DATAIN pin, 3 signal wire DATAIN/CLKIN/BLANK cablings are simple simultaneously.
With respect to the concatenated schemes of traditional Fig. 4, shown in scan decoding scheme (138 chip) and scanning decoding scheme drives signal link (as shown in Fig. 4 circle) to control all between power supply control chip, line increases greatly with respect to the present invention (Fig. 9), and the present invention has simplified the wiring problem of pcb board greatly.
Finally, as shown in Figure 8, Q2 and Q1 negate are carried out and operation, ensure in the time that DATAIN keeps high level for a long time, and～Q1 keeps low level, and DATAOUT keeps low level, ensure that follow-up power supply chip can all not light heating, cause circuit and chip to burn.
As fully visible, this example maximum feature be, by input signals such as BLANK/CLOCK/DATAIN, latch is shifted, and actuating logic computing, obtain the output signal CTRL1/CTRL2/DISCHARGE1/DISCHARGE2 shown in Figure 10, make the adjacent two row power supplys of LED scanning display screen there will not be the phenomenon of conducting simultaneously; Simultaneously by blanking circuit, the spurious charge of the out-put supply part of releasing, can complete solution LED scanning display screen in the problem of ghost, caterpillar, cross curve, significantly improve LED display display effect; And by internal arithmetic, built-in displacement latch function, saves the required scanning decoding scheme of LED scanning display screen, simplifies PCB design; Finally, by protection module, when guarantee appearance is abnormal, can not burn chip and circuit.
The foregoing is only embodiments of the invention; first, second relating in this foreign language ... only represent the differentiation of its title; there is any difference the significance level and the position that do not represent them; therefore specific embodiment content not thereby limits the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a LED display driving method, is characterized in that: it comprises,
The row actuation step that driving LED display screen powers on line by line;
In the row driving time gap of every two row of driving LED display screen, driving LED display screen is completed to the electric charge removal process that the spurious charge of the row of scanning is released.
2. LED display driving method as claimed in claim 1, is characterized in that: described row actuation step, in the time receiving input data signal, occurs that at interval input signal in the process of rising edge, carrying out appears to interval input signal in negative edge.
3. LED display driving method as claimed in claim 1, is characterized in that: the spurious charge that according to trigger pip, driving LED display screen is completed to the row of scanning in described electric charge removal process is released.
4. LED display driving method as claimed in claim 3, is characterized in that: described electric charge removal process specifically comprises step,
S1), at least two latches of initialization are output as low level/high level; Described latch output is corresponding with the line number that driving LED display screen drives;
S2), receive input data signal;
S3), clock signal to be shifted is while occurring, and first latch output is become to high level/low level;
S4), clock signal to be shifted is while again occurring, current latch output is become to low level/high level and next latch output is become to high level/low level;
S5), the row of the lastrow of LED display to be driven drives and finishes to perform step S6 between shift clock signal occurs again;
S6) row that, the current row of exporting corresponding LED display for high level/low level latch is completed to scanning as driving LED display screen carries out spurious charge and releases.
5. LED display driving method as claimed in claim 3, it is characterized in that: described row actuation step specifically comprises, when clock signal to be shifted and interval input signal disappear simultaneously and again occur to interval input signal, the current row of exporting corresponding LED display for high level/low level latch drives.
6. a LED power control circuit, is characterized in that: it comprises control module and drives blanking module; Described driving blanking unit comprises many group switch elements and blanking unit; Described switch element is provided with power input, LED display row drive output and control end; The control end of described switch element is connected with control module; Described blanking unit is provided with input end, release end and Enable Pin, and the input end of blanking unit is connected with the LED display row drive output of switch element, the end ground connection of releasing, and Enable Pin is connected with control module;
Described control module, for controlling one by one the control end that drives every group of switch element of blanking module, thereby the row that driving LED display screen powers on line by line drives, and in the row driving time gap of every two row of driving LED display screen, release to ground thereby enable the spurious charge that driving LED display screen completes the row of scanning by the Enable Pin of blanking unit in this group.
7. LED power control circuit as claimed in claim 6, is characterized in that: the switch element of every group of described driving blanking module comprises the first metal-oxide-semiconductor; Blanking unit comprises the second metal-oxide-semiconductor and bleeder resistance, and described bleeder resistance connects releasing between end and ground of the second metal-oxide-semiconductor.
8. LED power control circuit as claimed in claim 6, is characterized in that: described control module is provided with interval input signal end and shift clock signal end.
9. LED power control circuit as claimed in claim 8, is characterized in that: it also comprises displacement latch, and displacement latch is provided with input data signal end, shift clock signal end, the first latch output terminal and the second latch output terminal; Described driving blanking module comprises two groups of switch elements and blanking unit; The first latch output terminal of described shift register and the defeated link control module of the second latch;
Described displacement latch comprises the first trigger and the second trigger, described shift clock signal end connects respectively the input end of the first trigger and the second trigger, the first trigger input also connects the input of input data signal end, output connection the first latch output terminal and the second trigger, and the second trigger output connects the second latch output terminal;
Described control module comprise first or door, first with door, second or door and second and;
Input data signal latch, displacement and then the triggering as driving double switch unit of displacement latch to input;
Described first or door forward input connect interval input signal end, shift clock signal end and the second latch output terminal, oppositely input connects the first latch output terminal, output connects the control end of first group of switch element;
Described first is connected interval input signal end and the first latch output terminal with the forward input of door, and oppositely input connects shift clock signal end and the second latch output terminal, and output connects the Enable Pin of first group of blanking unit;
Described second or the forward input of door connect interval input signal end, the first latch output terminal and shift clock signal end, oppositely input the second latch output terminal, output connects the control end of second group of switch element;
Described second inputs interval input signal end and the second latch output terminal with door forward, oppositely inputs shift clock signal end and the first latch output terminal, and output connects the Enable Pin of second group of blanking unit.
10. LED power control circuit as claimed in claim 9; it is characterized in that: it also comprises protection module; described protection module comprise the 3rd not gate and the 3rd with door; the input of described the 3rd not gate connects the first latch output terminal; output connects the 3rd and inputs with door; the 3rd is also connected with the second latch output terminal with door input, and output is connected with outputting data signals end.
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| CN201410214499.6A CN103971642B (en) | 2014-05-20 | 2014-05-20 | LED display driving method and LED power control circuit |
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