CN203910234U - An LED power supply control circuit - Google Patents

An LED power supply control circuit Download PDF

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Publication number
CN203910234U
CN203910234U CN201420259708.4U CN201420259708U CN203910234U CN 203910234 U CN203910234 U CN 203910234U CN 201420259708 U CN201420259708 U CN 201420259708U CN 203910234 U CN203910234 U CN 203910234U
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China
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input
output terminal
blanking
led
row
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CN201420259708.4U
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Chinese (zh)
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田志辉
李家栋
张青松
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深圳市绿源半导体技术有限公司
深圳市达明视讯科技开发有限公司
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Priority to CN201420259708.4U priority Critical patent/CN203910234U/en
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Abstract

The utility model provides an LED power supply control circuit comprising a control module and a drive blanking module. The drive blanking module comprises a plurality of sets of switch units and blanking units. The switch units are provided with power supply input terminals, LED display screen line drive output terminals and control terminals. The control terminals of the switch units are connected with the control module. The blanking units are provided with input terminals, discharge terminals and enable terminals. The input terminals of the blanking units are connected with the LED display screen line drive output terminals of the switch units. The discharge terminals are grounded. The enable terminals are connected with the control module. Through controlled discharging of spurious charges of output power supply parts of lines which are just driven of an LED display screen, problems such as ghosting images, caterpillar images and cross lines in an LED scan display screen can be completely solved, thereby improving display effects of the LED display screen; and simultaneously problems of easy burnout of a power supply chip due to shortage of a protection circuit and problems of PCB wiring performance and efficiency are solved.

Description

LED power control circuit

Technical field

The utility model relates to LED display driver field, refers in particular to a kind of 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: take 1/32 scanning as example, first a frame time is divided into 32 parts, first show the first row at 0-1/32 in the time, 1/32-2/32 just shows the second row in the time, by that analogy, in the last 31/32-32/32 time, show the 32nd row, complete a frame and show.

Compare above-mentioned two kinds of LED display, the whole view data that scans display screen due to LED 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 referring to Fig. 1, is the LED scanning display screen schematic diagram of 32 scan lines in a prior art, 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 opened for 1/32 time in frame period by controlling requirement within the l two field picture display cycle, and exports line by line row voltage from the 1st row to the 32 row.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 Yu 2 guilds 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, when scanning shows the 2nd row data, previous row (the 1st row) still can be luminous with the control mode of the 2nd row in the time at T_overlap, 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 take 50Hz frame frequency as example, 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 the situation about interfering with each other that shows, has therefore greatly affected display effect.

In addition, tradition can find out from Fig. 1,4, and the line that uses scanning decoding scheme to output to power control circuit during traditional LED scanning display screen drives is controlled and driven 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 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 now LED scanning display screen 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, so shortcoming to some extent on working stability degree, fiduciary level.

Utility model content

Technical problem to be solved in the utility model 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 adopted in the utility model is: the utility model also relates to a kind of LED power control circuit, and 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, thereby enable the spurious charge that the Enable Pin of blanking unit in this group completes the row of scanning by driving LED display screen, release to ground.

The beneficial effects of the utility model are: 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.

Accompanying drawing explanation

Below in conjunction with accompanying drawing in detail concrete structure of the present utility model 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 utility model;

Fig. 6 is the circuit module schematic diagram of the displacement latch of LED power control circuit of the present utility model;

Fig. 7 is an embodiment circuit diagram of the control module of LED power control circuit of the present utility model;

Fig. 8 is an embodiment circuit diagram of the protection module of LED power control circuit of the present utility model;

Fig. 9 is the cascade schematic diagram of LED power control circuit of the present utility model;

Figure 10 is that LED display of the present utility model drives sequential chart.

Embodiment

By describing technology contents of the present utility model, 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 the utility model most critical 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 a plurality of 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, to adding logical operation circuit before the outputting data signals of each LED power control circuit, having protected, avoid producing overlapping power supply phenomenon.

First the utility model 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, thereby enable the spurious charge that the Enable Pin of blanking unit in this group completes the row of scanning by driving LED display screen, release to ground.

From foregoing description, the beneficial effects of the utility model are: by switch element driving LED display screen, carry out line scanning, 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, first latchs output terminal and second and latchs output terminal; Described driving blanking module comprises two groups of switch elements and blanking unit; First of described shift register latchs output terminal and second and latchs defeated link control module.

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 input data signal end, exports the input that output terminal and the second trigger are latched in connection first, and the second trigger output connects second and latchs output terminal;

As shown in Figure 7, described control module comprise first or door, first with door, second or door and second and;

Displacement latch latchs, is shifted the input data signal of input and then as the triggering that drives double switch unit;

Described first or door forward input connects interval input signal end, shift clock signal end and second latchs output terminal, oppositely input connects first and latchs output terminal, and output connects the control end of first group of switch element;

Described first is connected interval input signal end and first with the forward input of door latchs output terminal, and oppositely input connection shift clock signal end and second latchs 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, first and latch output terminal and shift clock signal end, oppositely input second and latch output terminal, output connects the control end of second group of switch element;

Described second latchs output terminal with door forward input interval input signal end and second, oppositely inputs shift clock signal end and first and latchs output terminal, and output connects the Enable Pin of second group of blanking unit.

The present embodiment provides is one can provide the LED display circuit structure that two row drive, and it latchs and then form first by displacement latch to the input signal of input and latchs output, second and latch output and 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 first and latchs output terminal; output connects the 3rd and inputs with door; the 3rd also latchs output terminal and is connected with second with door input, exports and is connected with outputting data signals end.Thus, by adding protection module, thereby can guarantee to occur when abnormal can not burn chip and circuit.

Below, with regard to the technical solution of the utility model, provide a concrete example:

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 utility model scheme 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, first trigger D1/ the second trigger D2 by input shift clock signal CLOCK by input data signal DATAIN respectively serial-shift, latch and form first and latch output Q1 and second and latch output Q2 and export, wherein shift clock signal CLOCK input adopts upper pull-up structure, when 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, difference 1/ blanking unit 2, gauge tap pipe 1/ switching tube 1/ blanking unit, wherein input pull-up structure in the input signal BLANK employing of interval, when there is no input signal will by move high level VCC to.

Drive the blanking in blanking module partly 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 in gap and control function in due course.Below illustrate:

In this example, whole input signal 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.When 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, guarantee 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 when switching to overlapping situation, reach blanking effect, Q1/Q2 is through protection module simultaneously, make to play a protective role when input serial data makes a mistake.

When DATAIN high impulse comes, mean that LED scanning display screen the 1st row power supply is about to work, when CLOCK rising edge (T1 constantly) 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, at T1 constantly, Q1 is output as high level, and Q2 still keeps low level; When second CLOCK rising edge (T4 constantly), Q1 output just becomes low level, and Q2 output will become high level; When 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,

At T2 constantly, 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;

At T3 constantly, 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;

At T4 constantly, 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 guarantee that the blanking of the first row power supply and the normal work of the second row power supply do not have sequential overlapping;

At T5 constantly, repeat the operation of the 1st row, CTRL2 is low level, and 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.

Concatenated schemes with respect to 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 utility model (Fig. 9), and the utility model has been simplified the wiring problem of pcb board greatly.

Finally, as shown in Figure 8, Q2 and Q1 negate are carried out and operation, guarantee when DATAIN keeps high level for a long time, and~Q1 keeps low level, and DATAOUT keeps low level, guarantee 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, be shifted and latch, 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, guarantee when appearance is abnormal can not burn chip and circuit.

The foregoing is only embodiment of the present utility model; 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 utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions 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 utility model.

Claims (5)

1. 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, thereby enable the spurious charge that the Enable Pin of blanking unit in this group completes the row of scanning by driving LED display screen, release to ground.
2. LED power control circuit as claimed in claim 1, 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.
3. LED power control circuit as claimed in claim 1, is characterized in that: described control module is provided with interval input signal end and shift clock signal end.
4. LED power control circuit as claimed in claim 3, is characterized in that: it also comprises displacement latch, and displacement latch is provided with input data signal end, shift clock signal end, first latchs output terminal and second and latchs output terminal; Described driving blanking module comprises two groups of switch elements and blanking unit; First of described shift register latchs output terminal and second and latchs defeated link control module;
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 input data signal end, exports the input that output terminal and the second trigger are latched in connection first, and the second trigger output connects second and latchs output terminal;
Described control module comprise first or door, first with door, second or door and second and;
Displacement latch latchs, is shifted the input data signal of input and then as the triggering that drives double switch unit;
Described first or door forward input connects interval input signal end, shift clock signal end and second latchs output terminal, oppositely input connects first and latchs output terminal, and output connects the control end of first group of switch element;
Described first is connected interval input signal end and first with the forward input of door latchs output terminal, and oppositely input connection shift clock signal end and second latchs 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, first and latch output terminal and shift clock signal end, oppositely input second and latch output terminal, output connects the control end of second group of switch element;
Described second latchs output terminal with door forward input interval input signal end and second, oppositely inputs shift clock signal end and first and latchs output terminal, and output connects the Enable Pin of second group of blanking unit.
5. LED power control circuit as claimed in claim 4; 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 first and latchs output terminal; output connects the 3rd and inputs with door; the 3rd also latchs output terminal and is connected with second with door input, exports and is connected with outputting data signals end.
CN201420259708.4U 2014-05-20 2014-05-20 An LED power supply control circuit CN203910234U (en)

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CN109192130A (en) * 2018-07-05 2019-01-11 厦门强力巨彩光电科技有限公司 LED display control circuit, driving chip and LED display
CN109935199A (en) * 2018-07-18 2019-06-25 京东方科技集团股份有限公司 Shift register cell, gate driving circuit, display device and driving method
CN109935199B (en) * 2018-07-18 2021-01-26 京东方科技集团股份有限公司 Shift register unit, grid driving circuit, display device and driving method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN109192130A (en) * 2018-07-05 2019-01-11 厦门强力巨彩光电科技有限公司 LED display control circuit, driving chip and LED display
CN109935199A (en) * 2018-07-18 2019-06-25 京东方科技集团股份有限公司 Shift register cell, gate driving circuit, display device and driving method
WO2020015642A1 (en) * 2018-07-18 2020-01-23 京东方科技集团股份有限公司 Shift register unit, gate driving circuit, display device and driving method
CN109935199B (en) * 2018-07-18 2021-01-26 京东方科技集团股份有限公司 Shift register unit, grid driving circuit, display device and driving method

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