CN205692548U - A kind of driving chip eliminating LED ghost and drive circuit - Google Patents
A kind of driving chip eliminating LED ghost and drive circuit Download PDFInfo
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- CN205692548U CN205692548U CN201620568048.7U CN201620568048U CN205692548U CN 205692548 U CN205692548 U CN 205692548U CN 201620568048 U CN201620568048 U CN 201620568048U CN 205692548 U CN205692548 U CN 205692548U
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Abstract
The utility model discloses a kind of driving chip eliminating LED ghost and drive circuit, wherein, described driving chip includes processing unit, blanker unit and constant current driving unit.This utility model passes through blanker unit, discharges the parasitic capacitance of each horizontal scanning line of LED array in blanking time section, and ghost in elimination, it is not necessary to the adjunct circuits such as pull down resistor does not haves caterpillar effect and LED lamp bead reverse biased problem.By blanker unit, the parasitic capacitance of each column scan line of LED array is charged, eliminates lower ghost.By constant current driving unit, LED lamp bead is carried out current constant control, blanking and current constant control are divided into two times by this utility model individually to be carried out, make LED lamp bead when display, the abnormal electric charge of its row and column parasitic capacitance eliminates the most so that driving chip has and can eliminate ghost and can eliminate again the ability of lower ghost.
Description
Technical field
This utility model relates to LED control chip field, particularly relates to the driving chip of a kind of LED of elimination ghost and drives
Galvanic electricity road.
Background technology
LED display scheme, when presenting single-point pattern of brightness, can present glimmer, ciomatic flare around this point.Ghost
The reason caused, is owing to the horizontal scanning line on pcb board and column scan line exist Cp Yu Cn parasitic capacitance, when system switching state
Time, the incorrect current potential of Cp Yu Cn can cause the generation of leakage current, and then around bright spot, LED produces abnormal light leak.
Referring to Fig. 1, ghost is divided into ghost and lower ghost, and its mechanism produced is as follows:
State 1: when the first row scan line COM1 terminates display, and parasitic capacitance Cp1 of the first row scan line is charged by P1 pipe
Keep high level.When next line COM2(the second horizontal scanning line) when opening, if SEG2 lights Q22, then the posting of the first row scan line
Raw electric capacity Cp1 electric charge can flow through SEG2 via Q12 and release, and thus produces Q12 light leak, is referred to as upper ghost.
State 2: light Q22, COM2 terminate display time, parasitic capacitance Cn2 of secondary series scan line is kept by N2 tube discharge
Low level, COM3 opens moment, and electric current fills high Cn2 from P3 through Q32, thus produces Q32 light leak, is referred to as lower ghost.Wherein, Q11
It is light emitting diode to Q33.
In sum, ghost(ghost) it is all to be caused by the improper current potential of system parasitic electric capacity, therefore, suitably bias
Current potential contributes to the elimination of ghost phenomenon.
The industry improvement to lower ghost, it is common that before COM line switches, SEG end level is drawn by row constant-current driven chip
Height, therefore parasitic capacitance Cn of column scan line keeps high level, does not have electric current and charges Cn, thus eliminate during the switching of COM line
Lower ghost.
For upper ghost problem, designing LED display circuit when, horizontal scanning line can be carried out discharge process, i.e. increase
Adding blanking circuit, current blanking circuit has following scheme,
The most drop-down resistance to earth；
2. Zener diode+pull down resistor.
The all upper ghost solutions that disappear occurred on the market at present are all to complete by horizontal scanning line is carried out bleed off electricity
, need to increase extra circuit, and bring caterpillar effect and LED reverse biased problem therewith.
Concrete, scheme 1 has low cost, easily feature, but horizontal scanning line has persistence pull-down current, right
LED produces bigger reverse bias voltage and there is caterpillar phenomenon.Horizontal scanning line is clamped down at 3.3V by scheme 2, does not has mao mao
Worm effect, but still LED can be produced bigger reverse bias voltage, scheme components and parts are more.
Therefore, prior art has yet to be improved and developed.
Utility model content
In view of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide driving of a kind of LED of elimination ghost
Dynamic chip and drive circuit, can eliminate upper ghost and lower ghost by driving chip, it is not necessary to the adjunct circuits such as pull down resistor.
The technical solution of the utility model is as follows:
A kind of driving chip eliminating LED ghost, described driving chip is provided with the display cycle, and the described display cycle wraps
Include blanking time section and PWM output time section；Described driving chip includes:
For in blanking time section, output blanking control signal is to blanker unit, and in PWM output time section,
Pwm signal is sent to the processing unit of constant current driving unit according to video data；
For according to described blanking control signal, electric to the parasitism of each horizontal scanning line of LED array in blanking time section
Hold and discharge, the blanker unit that the parasitic capacitance of each column scan line of LED array is charged；
For according to described pwm signal, controlling the bright dark constant current driving unit of LED lamp bead in PWM output time section；
The blanking of described processing unit controls end and connects the input of described blanker unit, the outfan of described blanker unit
Connect each column scan line；The video data outfan of described processing unit connects the input of described constant current driving unit, institute
The outfan stating constant current driving unit connects each column scan line.
In the described driving chip eliminating LED ghost, described blanking time section includes first time period and the second time
Section, the outfan of described blanker unit is connected with each column scan line of LED array；Described blanker unit is in first time period
Export the first level to each column scan line；Second electrical level be exported to each column scan line within the second time period.
In the described driving chip eliminating LED ghost, described first level is higher than second electrical level.
In the described driving chip eliminating LED ghost, described second electrical level is higher than the conducting of supply voltage with LED lamp bead
The difference of voltage.
In the described driving chip eliminating LED ghost, described blanking time section is that in LED array, the PWM of every two row is defeated
Go out time space.
A kind of drive circuit eliminating LED ghost, including driving chip as above, also includes:
For the power supply for described drive circuitry；
The LED array being made up of multiple LED lamp bead；
Give described driving chip for output display data, and drive the row of LED array to sweep line by line by row switch module
Retouch the main control module of line；
For the control signal according to main control module, control opening of the break-make between horizontal scanning line and the power supply of LED array
Close module；
Described power supply connects the horizontal scanning line of LED array by switch module, and the row of described main control module controls end and connects
The control signal input of switch module, the data output end of described main control module connects the input of driving chip, described in drive
The outfan of dynamic chip connects the column scan line of LED array.
In the described drive circuit eliminating LED ghost, described main control module includes:
For exporting control signal to decoder driver circuit, and output display data give the master control list of described driving chip
Unit；
For described control signal is decoded, according to the Signal-controlled switch module drive LED array after decoding
The decoder driver circuit of horizontal scanning line；
The data output end of described main control unit connects the input of described driving chip, the control letter of described main control unit
Number outfan connects the input of described decoder driver circuit, the control of the outfan connecting valve module of described decoder driver circuit
Signal input part processed.
Beneficial effect: a kind of driving chip eliminating LED ghost and drive circuit be provided in this utility model, wherein,
Described driving chip includes processing unit, blanker unit and constant current driving unit.This utility model passes through blanker unit, in blanking
In time period, the parasitic capacitance to each horizontal scanning line of LED array is discharged, ghost in elimination, it is not necessary to pull down resistor etc. add
Circuit, does not haves caterpillar effect and LED lamp bead reverse biased problem.By the blanker unit each column scan to LED array
The parasitic capacitance of line is charged, and eliminates lower ghost.By constant current driving unit, LED lamp bead is carried out current constant control, this practicality
Novel blanking and current constant control be divided into two times individually carry out so that LED lamp bead when display, its row and column parasitism electricity
The abnormal electric charge held eliminates the most so that driving chip has and can eliminate ghost and can eliminate again the ability of lower ghost.
Accompanying drawing explanation
Fig. 1 is existing LED display drive circuit.
The structured flowchart of the drive circuit of the eliminated LED ghost that Fig. 2 provides for this utility model.
The circuit theory diagrams of the drive circuit of the eliminated LED ghost that Fig. 3 provides for this utility model.
The working timing figure that the drive circuit of the eliminated LED ghost that Fig. 4 provides for this utility model is corresponding.
The method flow diagram of the driving method of the eliminated LED ghost that Fig. 5 provides for this utility model.
Detailed description of the invention
This utility model provides a kind of driving chip eliminating LED ghost and drive circuit, of the present utility model for making
Purpose, technical scheme and effect are clearer, clear and definite, further describe this utility model below.Should be appreciated that herein
Described specific embodiment, only in order to explain this utility model, is not used to limit this utility model.
Refer to the knot of the drive circuit preferred embodiment that Fig. 2, Fig. 2 are the eliminated LED ghost that this utility model provides
Structure block diagram.Described drive circuit, including driving chip U1, power supply 20, main control module 30, switch module 40 and LED array 50.
Described power supply 20, for for described drive circuitry, supply voltage of its output is VLED.
Described LED array 50 is exactly LED display, and it is made up of multiple LED lamp bead, in the present embodiment, and described LED array
50 is the array of m row n row, and wherein, m and n is the positive integer more than or equal to 1.
Described main control module 30, for output display data give described driving chip U1, and by row switch module 40 by
The horizontal scanning line of row cutting LED array 50.
Described switch module 40, for according to the control signal of main control module 30, control the horizontal scanning line of LED array 50 with
Break-make between power supply 20.
Described driving chip U1, for sweeping each row of LED array 50 in space sweep time of every two row of LED array 50
The parasitic capacitance retouching line is discharged, to eliminate upper ghost；While the parasitic capacitance of horizontal scanning line is discharged, right
The parasitic capacitance of each column scan line of LED array 50 is charged, to eliminate lower ghost.In the present embodiment, described driving chip
U1 is row driving chip.
Described power supply 20 connects each horizontal scanning line of LED array 50 by switch module 40, described main control module 30
Row controls the control signal input of end connecting valve module 40, and the data output end of described main control module 30 connects driving chip
The input of U1, the outfan of described driving chip U1 connects each column scan line of LED array 50.
This utility model carrys out bleed off horizontal scanning line capacitance charge mode by column drive wire Control of Voltage, is not increasing line
In the case of circuit overhead, upper ghost is completely eliminated.And in prior art, need on horizontal scanning line, set up Zener diode
And pull down resistor.It follows that structure of the present utility model is simpler, cost is lower, caterpillar effect and LED will not be produced
Lamp reverse biased problem；The drive circuit compatibility that this utility model provides is good.And, this utility model is by row driving chip
Eliminate ghost, have the function eliminating lower ghost simultaneously concurrently, also can reach higher constant current precision when low ash display.
Further, described switch module 40 includes 4953 chips, and it has m PMOS to drive m bar horizontal scanning line,
That is, every horizontal scanning line has a PMOS to drive.The control signal that the grid of m PMOS constitutes switch module 40 is defeated
Entering end, the source electrode of m PMOS connects the outfan of power supply 20, and the drain electrode of m PMOS connects corresponding horizontal scanning line.Change and
Yan Zhi, main control module 30 exports control signal and controls the conducting state of corresponding PMOS, thus goes LED array 50 and sweep
Retouch.
Described main control module 30 includes main control unit 310 and decoder driver circuit 320.Described main control unit 310 is for defeated
Go out control signal to decoder driver circuit, and the enable signal of output display data and driving chip U1 gives described driving chip
U1.The data output end of described main control unit 310 connects the input of described driving chip U1, the control of described main control unit 310
Signal output part processed connects the input of described decoder driver circuit 320.Described decoder driver circuit 320 is for described control
Signal decodes, according to the horizontal scanning line of the Signal-controlled switch module drive LED array 50 after decoding, in other words, and will
Signal after decoding exports to corresponding PMOS, controller conducting state, it is achieved the row scanning of LED array 50.Described decoding
The outfan of drive circuit 320 is that the row of main control module 30 controls end, the control signal input of connecting valve module.Further
, described driving chip U1 includes being provided with the processing unit 110 of display cycle, blanker unit 120 and constant current driving unit
130.In other words, processing unit 110 controlling the display cycle of LED matrix, the described display cycle includes blanking time section
With PWM output time section.Wherein, described blanking time section is that the PWM output time space of every two row in LED array is (during scanning
Between space).In the present embodiment, within a display cycle, described blanking time section is before PWM output time section.
Described processing unit 110, in blanking time section, output blanking control signal to blanker unit 120, and
In PWM output time section, send pwm signal to constant current driving unit 130 according to video data.Preferably, shown process is single
Unit 110 is processor, such as MCU etc..
Described blanker unit 120, for according to described blanking control signal, to LED array 50 in blanking time section
The parasitic capacitance (Cp1, Cp2 ..., Cpm) of each horizontal scanning line is discharged, to each column scan line of LED array 50
Parasitic capacitance (Cn1, Cn2 ..., Cnn) is charged.
Described constant current driving unit 130, for according to described pwm signal, controls LED lamp bead in PWM output time section
Bright secretly, it is achieved the current constant control of LED lamp bead.
The blanking of described processing unit 110 controls end and connects the input of described blanker unit 120, described blanker unit
The outfan of 120 connects each column scan line.The video data outfan of described processing unit 110 connects described constant-current driving list
The input of unit 130, the outfan of described constant current driving unit 130 connects each column scan line.
Blanking and current constant control are divided into two times by this utility model individually to be carried out so that LED lamp bead when display,
Its row and column parasitic capacitance eliminates the most so that driving chip has and can eliminate ghost and can eliminate again the ability of lower ghost.
Further, described blanking time section includes first time period T1 and the second time period T2, described blanker unit 120
Outfan be connected (electrical connection) with each column scan line of LED array 50；Described blanker unit 120 specifically for, first
In time period, output the first level (voltage) gives each column scan line, to the parasitic capacitance discharge of the LED lamp bead on column scan line；
Within the second time period, each column scan line is given in output second electrical level (voltage), utilizes charge share to eliminate upper ghost.Due to
One level and second electrical level are above the unlatching required voltage of LED, therefore reach to eliminate the effect of lower ghost simultaneously.The present embodiment
In, in a blanking time section, described first time period T1 is before the second time period T2.Described first level is higher than (big
In) second electrical level, beneficially charge share.
Referring to Fig. 3, described constant current driving unit 130 includes that n NMOS tube and n constant-current drive circuit (do not show in figure
Go out), a NMOS tube correspondence is connected in series a constant-current drive circuit；Each NMOS tube and constant-current drive circuit correspondence connect one
Bar column scan line, i.e. the drain electrode of NMOS tube connects corresponding column scan line, and the source electrode of NMOS tube connects constant-current drive circuit,
The grid of NMOS tube is the input of constant current driving unit 130, the video data outfan of connection processing unit.Only need to control n
The input voltage of individual NMOS tube grid can realize the current constant control of the LED lamp bead to respective column, i.e. described NMOS tube is that constant current is driven
Dynamic switch, processing unit 110 output pwm signal can realize the current constant control to these row to corresponding NMOS tube.
Described blanker unit 120 includes that voltage generator Vdri and n switch, described voltage generator Vdri are used for producing
First level and second electrical level.One end of n switch connects the outfan of voltage generator Vdri, the other end pair of n switch
Should connect respective column scan line, the end that controls of n switch connects the blanking control end of processing unit 110.N switch is according to institute
The control realization stating blanking control signal is turned on and off.
Preferably, described first level is the supply voltage VLED on horizontal scanning line, and described second electrical level is more than (being higher than)
The difference of conducting voltage Vrgb of supply voltage VLED and LED lamp bead, i.e. second electrical level ＞ VLED-Vrgb, it is ensured that will not produce
LED light leak.Owing to the first level and second electrical level are all higher than VLED-Vrgb, all will not so switching COM line in arbitrary level
Produce lower ghost.When eliminating upper and lower ghost, before lastrow scan line (as a example by COM1) terminates scanning, first output the first electricity
Flat (supply voltage VLED) gives column scan line, allows parasitic capacitance CL of LED lamp bead discharge, after lastrow scan line terminates scanning,
Export the second voltage again to column scan line, dragged down the electric charge of parasitic capacitance Cp of horizontal scanning line, eliminated ghost.Due to
One level and second electrical level can complete the parasitic capacitance Cn charge step to column scan line, eliminate lower ghost.It follows that
This utility model uses capacitance charge to share technology, utilizes the parasitic capacitance of LED own, is effectively reduced by row driving chip
The parasitic capacitance electric charge of horizontal scanning line, while realization disappears ghost, LED display system need not increase any horizontal blanking electricity
Road.Owing to the LED lamp bead in light-emitting diode display includes red-light LED lamp bead, green light LED lamp bead and blue-ray LED lamp bead, therefore, described
Conducting voltage Vrgb of LED lamp bead includes three kinds: the conducting voltage of red-light LED lamp bead, the conducting voltage of green light LED lamp bead and indigo plant
The conducting voltage of light LED lamp bead.
It follows that this utility model is by adding blanking time section, the integrated ghost that disappears in conventional PWM output time section
Shadow function, greatly reduces the impact of ghost.
In this utility model embodiment, control blanker unit (blanking electricity by the processing unit within driving chip U1
Road) and constant current driving unit (constant current output circuit), in LED display scanning process, blanker unit is in the scanning of every two row
The parasitic capacitance of time space line each to LED display is discharged, and is charged the parasitic capacitance of each alignment, thus reaches
To the purpose effectively eliminating ghost phenomenon.
In this utility model, external piloting control unit 310 send control signal make decoder driver circuit 320 open LED show
Display screen (LED matrix) the first row, the now conducting of PMOS P1, horizontal scanning line COM1 voltage is pulled up to VLED magnitude of voltage.Simultaneously
External piloting control unit 310 sends video data and enables the signal processing unit to driving chip, and then opens constant-current driving list
Unit outputs current to SEG1-SEGn port, makes the LED lamp bead of LED display the first row show according to default illumination effect.
At the end of PWM output signal, interior processing unit closes constant current driving unit, and SEG1-SEGn is in closedown shape
State.When blanking control signal starts (that is, when blanking time section starts), processing unit will drive blanker unit out-put supply electricity
Flat VLED(the first level), the parasitic capacitance electric charge of the first row LED lamp bead is given out light, alignment each to LED display is parasitic simultaneously
Electric capacity charges, and eliminates lower ghost.After the parasitic capacitance electric charge of the LED lamp bead of the first row is given out light, main control unit sends control and refers to
Order makes decoder driver circuit close LED display the first row, and now PMOS P1 is closed, and processing unit drives blanker unit Vdri
Output second electrical level, is pulled to second electrical level by SEG1-SEGn port level, by the parasitic capacitance electric charge of the first row scan line COM1
Share on the driving electric capacity of the first row LED, thus reduce the voltage of the first row scan line COM1, complete LED display first
The parasitic capacitance discharge of line, ghost in elimination；Opening the second row, now PMOS P2 is opened, the second horizontal scanning line COM2 electricity
Pressure will be pulled up to VLED, and owing to the voltage of SEG end is the second voltage, VLED-the second voltage is less than the electric conduction of LED lamp bead
Pressure, therefore lower ghost will not be produced.
After the display completing the first row LED and blanking, external piloting control unit has sent control instruction makes decoding drive
The second row of LED display is opened on galvanic electricity road, and processing unit starts to send video data and the blanking control signal of the second row, joins
Conjunction external piloting control unit is according to above-mentioned work process line each to LED display parasitic capacitance discharge, and each alignment parasitic capacitance is filled
Electricity is to reach blanking purpose.
See also Fig. 4, Fig. 4 to show and can eliminate the working timing figure that the drive circuit of LED ghost is corresponding, its
In, GC1 is the driving signal that LED display the first row is opened, and GC2 is the driving signal that LED display the second row is opened, GC1
It is the level to open LED display a line LED that decoder driver circuit is exported according to the instruction of main control unit with GC2
Signal.Ghost signal is the blanking control signal that processing unit drives blanker unit blanking, and pwm signal is constant current driving unit
Enable signal, SEGN is the voltage signal of driving chip outfan.
One complete display cycle includes blanking time section and PWM output time section, and blanking time section comprises T1 and T2
Two processes.In the T1 period, pwm signal is closed, and constant current output stops, and now ghost signal controls blanker unit output VLED
Level, external piloting control unit sends control instruction makes decoding circuit close LED display the first row COM line, and opens the second row
COM line, now the parasitic capacitance electric charge of the first row LED is given out light.In the T2 period, ghost signal controls blanker unit output
Vrgb level, by the parasitic capacitance electric charge bleed off of the first row COM line to the parasitic capacitance of the first row LED lamp bead, the first row COM
Line level declines, and the ghost process that disappears terminates.During PWM cycle (that is, in PWM output time section), the process list of driving chip
Unit, by sending pwm signal according to the video data received from external piloting control unit, opens constant current output circuit lightening LED lamp,
After completing to show sequential, pwm signal is closed, and constant current output unit stops output electric current, and SEG1-SEGn end is unsettled.PWM cycle is tied
Shu Hou, circuit enters the next display cycle, starts the display of next line.Wherein, first time period T1 and the second time period T2
Ratio according to actual current load situation set.
The outfan of driving chip described in the utility model also add level and clamps down on function, makes row output drive Guan Budan
Possesses constant-current drive capability, moreover it is possible to clamped down in stable level by channel output end according to timing requirements.This utility model provides
Drive circuit, ghost and lower ghost can be completely eliminated, low ash constant current effect is also had improvement.
In sum, the utility model proposes and come bleed off horizontal scanning line capacitance charge side by column drive wire Control of Voltage
Formula, in the case of not increasing line circuit overhead, is completely eliminated upper ghost.The compatible existing driving of described driving chip
Circuit, overall price is generally the least expensive.Owing to this programme is to eliminate row ghost by row driving chip, have elimination row ghost concurrently simultaneously
Function, also can reach higher constant current precision when low ash display.
The driving chip of eliminated LED ghost based on above-described embodiment offer and the drive circuit that LED ghost can be eliminated,
This utility model also provides for a kind of driving method eliminating LED ghost, refers to Fig. 5, and described driving method includes walking as follows
Rapid:
S10, is divided into blanking time section and PWM output time section the display cycle of LED array.Concrete, in advance upper
Stating and arrange the display cycle in the processing unit of driving chip, the described display cycle includes blanking time section and PWM output time section.
Described processing unit is in blanking time section, and output blanking control signal is to blanker unit, and in PWM output time section,
Pwm signal is sent to constant current driving unit according to video data.
S20, in blanking time section, the parasitic capacitance of each horizontal scanning line of LED array is discharged, to LED array
The parasitic capacitance of each column scan line is charged.That is, blanker unit is according to described blanking control signal, right in blanking time section
The parasitic capacitance of each horizontal scanning line of LED array is discharged, and fills the parasitic capacitance of each column scan line of LED array
Electricity.
Described blanking time section includes first time period and the second time period, and described step S20 specifically includes: blanker unit
The first level be exported to each column scan line of LED array in first time period；Second electrical level is exported within the second time period
To each column scan line of LED array；Described first level is higher than second electrical level.Described second electrical level is higher than (that is, being more than) electricity
The difference of the conducting voltage of source voltage and LED lamp bead.
S30, control in PWM output time section LED lamp bead bright secretly.That is, constant current driving unit is in PWM output time section
Interior control LED lamp bead bright secretly.
Due to the described LED of elimination ghost driving method disappear ghost principle and feature the most detailed
Thin elaboration, does not repeats them here.
It should be appreciated that application of the present utility model is not limited to above-mentioned citing, those of ordinary skill in the art are come
Saying, can be improved according to the above description or convert, all these modifications and variations all should belong to the appended power of this utility model
The protection domain that profit requires.
Claims (7)
1. the driving chip that can eliminate LED ghost, it is characterised in that described driving chip is provided with the display cycle, described
Display cycle includes blanking time section and PWM output time section；Described driving chip includes:
For in blanking time section, output blanking control signal is to blanker unit, and in PWM output time section, according to
Video data sends pwm signal to the processing unit of constant current driving unit；
For according to described blanking control signal, the parasitic capacitance of each horizontal scanning line of LED array being entered in blanking time section
Row electric discharge, the blanker unit that the parasitic capacitance of each column scan line of LED array is charged；
For according to described pwm signal, controlling the bright dark constant current driving unit of LED lamp bead in PWM output time section；
The blanking of described processing unit controls end and connects the input of described blanker unit, and the outfan of described blanker unit connects
Each column scan line；The video data outfan of described processing unit connects the input of described constant current driving unit, described perseverance
The outfan of stream driver element connects each column scan line.
The driving chip of LED ghost can be eliminated the most according to claim 1, it is characterised in that described blanking time section includes
First time period and the second time period, the outfan of described blanker unit is connected with each column scan line of LED array；Described disappear
Hidden unit exports the first level to each column scan line in first time period；Second electrical level be exported to each within the second time period
Individual column scan line.
The driving chip of LED ghost can be eliminated the most according to claim 2, it is characterised in that described first level is higher than the
Two level.
The driving chip of LED ghost can be eliminated the most according to claim 3, it is characterised in that described second electrical level is higher than electricity
The difference of the conducting voltage of source voltage and LED lamp bead.
The driving chip of LED ghost can be eliminated the most according to claim 1, it is characterised in that described blanking time section is LED
The PWM output time space of every two row in array.
6. the drive circuit that can eliminate LED ghost, it is characterised in that include driving chip as claimed in claim 1, also
Including:
For the power supply for described drive circuitry；
The LED array being made up of multiple LED lamp bead；
Give described driving chip for output display data, and driven the horizontal scanning line of LED array by row switch module line by line
Main control module；
Switching molding for the break-make between the control signal according to main control module, horizontal scanning line and the power supply of control LED array
Block；
Described power supply connects the horizontal scanning line of LED array by switch module, and the row of described main control module controls end connecting valve
The control signal input of module, the data output end of described main control module connects the input of driving chip, described driving core
The outfan of sheet connects the column scan line of LED array.
The drive circuit of LED ghost can be eliminated the most according to claim 6, it is characterised in that described main control module includes:
For exporting control signal to decoder driver circuit, and output display data give the main control unit of described driving chip；
For described control signal is decoded, sweep according to the row of the Signal-controlled switch module drive LED array after decoding
Retouch the decoder driver circuit of line；
The data output end of described main control unit connects the input of described driving chip, and the control signal of described main control unit is defeated
Go out end and connect the input of described decoder driver circuit, the control letter of the outfan connecting valve module of described decoder driver circuit
Number input.
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| CN107403603A (en) * | 2017-09-22 | 2017-11-28 | 深圳市云智科技有限公司 | LED scans the control circuit of display screen |
| WO2017215310A1 (en) * | 2016-06-14 | 2017-12-21 | 深圳君略科技有限公司 | Drive chip, drive circuit and drive method capable of eliminating led ghost |
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| CN108320698A (en) * | 2018-03-21 | 2018-07-24 | 佛山市青松科技股份有限公司 | A kind of LED drivings display circuit |
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