CN108925009A - Electrostatic discharge protection circuit and antistatic mould group - Google Patents
Electrostatic discharge protection circuit and antistatic mould group Download PDFInfo
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- CN108925009A CN108925009A CN201810926142.9A CN201810926142A CN108925009A CN 108925009 A CN108925009 A CN 108925009A CN 201810926142 A CN201810926142 A CN 201810926142A CN 108925009 A CN108925009 A CN 108925009A
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- 238000005421 electrostatic potential Methods 0.000 description 18
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention relates to a kind of electrostatic discharge protection circuits and antistatic mould group.The circuit includes controller, driving circuit, absorbs leadage circuit, LED array circuit and one-way conduction circuit；The connection of the input terminal of controller and driving circuit, first output end of driving circuit is connect with leadage circuit is absorbed, the second output terminal of driving circuit and the input terminal of one-way conduction circuit connect, and the output end and absorption leadage circuit of one-way conduction circuit are connect with the input terminal of LED array circuit；Leadage circuit is absorbed, for absorbing and releasing the electrostatic between driving circuit and LED array circuit；One-way conduction circuit, for absorbing the electrostatic between driving circuit and LED array circuit and exporting one-way conduction signal, in this way, increase in the circuit and absorbs leadage circuit, effectively sponge the electrostatic formed in circuit, further through increasing one-way conduction circuit, the residual static electricity voltage in further absorbing circuit.
Description
Technical field
The present invention relates to circuit fields, more particularly to a kind of electrostatic discharge protection circuit and antistatic mould group.
Background technique
Light emitting diode (Light Emitting Diode, abbreviation LED) is one kind of semiconductor diode, can be electricity
Luminous energy can be converted to.LED device has evolved to a very mature stage, is widely used in multiple fields.
In recent years, LED application development is rapid, and product gradually develops to the indoor small spacing line of production, due to indoor small
Encapsulating or plating protection film process all are not done in lamp face away from product major part, so that LED lamp bead pin can be exposed to air for a long time
In, the interference of electrostatic is subjected to when understanding, such as：Phase mutual friction between object excites electrostatic caused by electronics transfer；Connecing between object
Touching and separation generate electrostatic caused by electronics transfer；Electromagnetic induction causes electrostatic caused by the movement of body surface charge；Friction
Electrostatic caused by comprehensive effect with electromagnetic induction etc., these electrostatic can all cause damage to a certain extent to LED device.Mesh
Before, the common antistatic mode of LED is that staff dresses antistatic aids in process of production, and it is right in production process to reduce
The damage of LED device.
But the above method can only reduce the electrostatic damage in production process, anti-static effect is very faint.
Summary of the invention
Based on this, it is necessary to be dressed in the prior art by staff quiet in antistatic aids reduction production process
Electric injury, the technical problem for causing anti-static effect very faint provide a kind of electrostatic discharge protection circuit and antistatic mould group.
In a first aspect, the present invention provides a kind of electrostatic discharge protection circuit, the circuit includes：Controller, driving circuit, absorption
Leadage circuit, LED array circuit and one-way conduction circuit；The input terminal of the controller and the driving circuit connects
Connect, the first output end of the driving circuit is connect with the absorption leadage circuit, the second output terminal of the driving circuit with
The input terminal of the one-way conduction circuit connects, and the output end of the one-way conduction circuit and the absorption leadage circuit are and institute
State the input terminal connection of LED array circuit；
The absorption leadage circuit, for absorb and release the driving circuit and the LED array circuit it
Between electrostatic；
The one-way conduction circuit, it is quiet between the driving circuit and the LED array circuit for absorbing
Electricity, and export one-way conduction signal.
Further include in one of the embodiments,：The one-way conduction circuit includes diode and first resistor；
The diode anode connect with the second output terminal of the driving circuit, the cathode of the diode with it is described
Leadage circuit connection is absorbed, the both ends of the first resistor are let out with the second output terminal of the driving circuit and the absorption respectively
Put circuit connection.
Further include in one of the embodiments,：The driving circuit includes horizontal drive circuit and column drive circuit；
The controller is connect with the input terminal of the input terminal of the horizontal drive circuit and the column drive circuit respectively, institute
The output end for stating horizontal drive circuit is connect with the input terminal of the one-way conduction circuit, the output end of the column drive circuit and institute
It states and absorbs leadage circuit connection.
Further include in one of the embodiments,：The absorption leadage circuit includes first absorbing release sub-circuit and the
Two absorb sub-circuit of releasing；
It is described first absorb release sub-circuit one end ground connection, it is described first absorb release sub-circuit the other end respectively with
The output end of the one-way conduction circuit is connected with the input terminal of the LED array circuit；
It is described second absorb release sub-circuit one end ground connection, it is described second absorb release sub-circuit the other end respectively with
The input terminal of the LED array circuit is connected with the output end of the column drive circuit.
Further include in one of the embodiments,：Described first, which absorbs sub-circuit of releasing, includes the first Anti-static device；Institute
State the first Anti-static device one end ground connection, the other end of first Anti-static device respectively with the one-way conduction circuit
Output end is connected with the input terminal in the LED array circuit.
Further include in one of the embodiments,：Described second, which absorbs sub-circuit of releasing includes multiple parallel connections second, prevents
Electrostatic devices；One end of each second Anti-static device is grounded, the other end difference of each second Anti-static device
It is connect with the output end of the input terminal of the LED array circuit and the column drive circuit.
Further include in one of the embodiments,：Described second absorbs second that sub-circuit of releasing further includes multiple parallel connections
Resistance；One end of each second resistance is connected with corresponding second Anti-static device, each second resistance it is another
End is connect with the output end of the column drive circuit.
Further include in one of the embodiments,：The absorption leadage circuit further includes that third absorbs sub-circuit of releasing；
The third absorbs one end ground connection for sub-circuit of releasing, the third absorb the other end of sub-circuit of releasing respectively with
Power supply is connected with the input terminal of the horizontal drive circuit.
Further include in one of the embodiments,：It includes third Anti-static device, institute that the third, which absorbs sub-circuit of releasing,
One end ground connection of third Anti-static device is stated, the other end of the third Anti-static device is electric with power supply and row driving respectively
The input terminal on road connects.
Second aspect, the present invention provide a kind of antistatic mould group, including：Printed circuit board and as described in any of the above item
Electrostatic discharge protection circuit, the electrostatic discharge protection circuit are arranged on the printed circuit board.
Electrostatic discharge protection circuit and antistatic mould group provided by the invention, the circuit include that controller, driving circuit, absorption are let out
Discharge road, LED array circuit and one-way conduction circuit；The controller is connect with the input terminal of the driving circuit,
First output end of the driving circuit is connect with the absorption leadage circuit, the second output terminal of the driving circuit with it is described
The input terminal of one-way conduction circuit connects, the output end of the one-way conduction circuit and the absorption leadage circuit with the hair
The input terminal of light diode array circuit connects；The absorption leadage circuit, for absorbing and releasing the driving circuit and institute
State the electrostatic between LED array circuit；The one-way conduction circuit, for absorbing the driving circuit and the hair
Electrostatic between light diode array circuit, and one-way conduction signal is exported, in this way, the circuit is being free of antistatic protection function
Increase in circuit and absorb leadage circuit, effectively sponge the electrostatic formed in circuit, further through increase one-way conduction circuit, benefit
The output of one-way conduction signal can be effectively realized with the characteristic of its one-way conduction, and residual static electricity is prevented to enter, thus into
Residual static electricity voltage in the absorbing circuit of one step.
Detailed description of the invention
Fig. 1 is that the application shows a kind of electrostatic discharge protection circuit that one embodiment provides；
Fig. 2 is that the application shows a kind of one-way conduction circuit that one embodiment provides；
Fig. 3 is that the application shows a kind of driving circuit that one embodiment provides；
Fig. 4 is that the application shows a kind of absorption leadage circuit that one embodiment provides；
Fig. 5 shows one kind second that one embodiment provides for the application and absorbs sub-circuit of releasing；
Fig. 6 is that the application shows a kind of anti-static circuit that another embodiment provides；
Fig. 7 is that the application shows a kind of antistatic mould group that one embodiment provides.
Detailed description of the invention：
10, controller；
11, driving circuit；
12, one-way conduction circuit；
13, absorb leadage circuit；
14, LED array circuit；
111, horizontal drive circuit；
112, column drive circuit；
131, first absorbs sub-circuit of releasing；
132, second absorbs sub-circuit of releasing；
133, third absorbs sub-circuit of releasing；
1311, the first Anti-static device；
1321, multiple second Anti-static devices；
1331, third Anti-static device；
VD, diode；
R1, first resistor；
R2, second resistance；
VCC, power supply；
GND, ground terminal.
Specific embodiment
Electronic product is very high to electrostatic protection requirement, and still, general staff dresses antistatic aids, can only reduce life
Electrostatic damage during production, anti-static effect are very faint.Electrostatic discharge protection circuit and antistatic mould group purport provided by the present application
Solving technical problem as above.
In order to which the objects, technical solutions and advantages of the application are more clearly understood, by the following examples and combine attached
Figure, electrostatic discharge protection circuit and antistatic mould group to the application are further elaborated.It should be appreciated that described herein
Specific embodiment only to explain the application, is not used to limit the application.
It is component institute serialization number itself, such as " first ", " second " etc. in the application, it is described right to be only used for distinguishing
As not having any sequence or art-recognized meanings.And " connection ", " connection " described in the application include unless otherwise instructed direct
Be indirectly connected with (connection).In the description of the present application, it is to be understood that term " on ", "lower", "front", "rear", " left side ",
The orientation of the instructions such as " right side ", "vertical", "horizontal", "top", "bottom", "inner", "outside", " clockwise ", " counterclockwise " or position are closed
System indicates to be based on the orientation or positional relationship shown in the drawings, being merely for convenience of description the application and simplifying description
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the application.
In this application unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.The application
In, not in such a way that the difference of title is as element is distinguished, but it is former as distinguishing with the difference of element functionally
Then.
Referring to Figure 1, the application show one embodiment offer electrostatic discharge protection circuit, the circuit include controller 10,
Driving circuit 11 absorbs leadage circuit 13, LED array circuit 14 and one-way conduction circuit 12.The controller 10 and drive
The input terminal connection of dynamic circuit 11, the first output end of the driving circuit 11 are connect with leadage circuit 13 is absorbed, the driving circuit
11 second output terminal is connect with the input terminal of one-way conduction circuit 12, and the output end of the one-way conduction circuit 12 and the absorption are let out
Electric discharge road 13 is connect with the input terminal of LED array circuit 14；The absorption leadage circuit 13, for absorbing and releasing
Electrostatic between driving circuit and LED array circuit.The one-way conduction circuit 12, for absorbing driving circuit and hair
Electrostatic between light diode array circuit, and export one-way conduction signal.
Wherein, which can be micro-control unit (Microcontroller Unit, abbreviation MCU), be also possible to
Digital Signal Processing (Digital Signal Processing, abbreviation DSP), can also be field programmable gate array
(Field-Programmable Gate Array, abbreviation FPGA), can also be other processors, the present embodiment to this not
It limits.Above-mentioned driving circuit can be the driving of dynamic scan type, be also possible to the driving of static latch type, optionally, the driving
Driving chip in circuit can be general chip, be also possible to special chip, and the present embodiment does not limit this.It is optional
Ground, above-mentioned diode array circuit can be 4*4 dot matrix, 8*8 dot matrix, 16*16 dot matrix, and the present embodiment does not limit this, tool
The row matrix columns of body diode array according to the actual situation depending on.Optionally, above-mentioned one-way conduction circuit, can be diode
It is constituted with resistance, is also possible to triode and resistance is constituted, the present embodiment does not limit this, as long as in the one-way conduction circuit
Device have one-way conduction characteristic.Optionally, above-mentioned absorption leadage circuit, may include Anti-static device, this prevents quiet
Electrical part can be TVS transient state and inhibit pipe, be also possible to other Anti-static devices, for example, multilayer pressure sensitive resistance, metal oxide
Varistor etc., the present embodiment does not limit this.
In the present embodiment, signal enters driving circuit by controller output, is respectively enterd by driving circuit and is unidirectionally led
Circuit passband and absorption leadage circuit enter LED array circuit by the signal of one-way conduction circuit, and absorb and release
The signal ground of circuit is equivalent to and the part signal is released.In this way, transmitted from computer when controller reception
Signal, after the signal received output is then transmitted to driving circuit, driving circuit is according to the signal to diode array electricity
Road is scanned control, so that diode array circuit regularly shines, can show preset text or figure etc., when
When having electrostatic to enter in circuit from the pin of light emitting diode, the electrostatic of formation absorbs leadage circuit by electrostatic and absorbs, for residual
Remaining electrostatic potential can then be absorbed by one-way conduction circuit, thus in the feelings for guaranteeing that diode array circuit normally shows work
Under condition, electrostatic protection is realized, greatly reduces the harm of electrostatic bring.
As shown in Fig. 2, in one embodiment, the application provides a kind of one-way conduction circuit 12, including diode VD and
First resistor R1.The anode of diode VD is connect with the second output terminal of above-mentioned driving circuit 11, the cathode of diode VD
Connect with above-mentioned absorption leadage circuit 13, the both ends of first resistor R1 respectively with the second output terminal of above-mentioned driving circuit 11 and
Above-mentioned absorption leadage circuit 13 connects.
Wherein, diode is in parallel with first resistor in the circuit, and the resistance value of the first resistor can be 33 Ω to 100 Ω
Between, the characteristic of the one-way conduction based on diode, the electrostatic potential into the circuit is absorbed by above-mentioned absorption leadage circuit
Afterwards, because absorption is not thorough, some residual static electricity voltages can be remained in the circuit, at this moment, which uses diode, is based on two
The unilateral conduction of pole pipe, can prevent residual static electricity voltage between LED array circuit and the horizontal drive circuit into
While entering driving circuit, it can also be ensured that the signal of horizontal drive circuit output enters LED array by the diode
Circuit.In addition, first resistor not only can sponge residual static electricity voltage based on Ohm's law in the circuit, can also will be expert at
When driving circuit scans LED array circuit, the light-emitting LED parasitic capacitance of the row can charge simultaneously and the electricity that stores
Amount sponges, and prevents when horizontal drive circuit scanning next line is light-emitting LED, which can discharge and make shining for lastrow
Ghost phenomenon caused by diode glimmer.In this way, the circuit makes the horizontal drive circuit in the circuit using one-way conduction circuit
While not by the damage of electrostatic potential, moreover it is possible to prevent the light emitting diode matrix from ghost phenomenon occur.It should be noted that should
The structure of one-way conduction circuit provided by embodiment is only used for illustrating, and is not limited to structure shown in Fig. 2.
As shown in figure 3, in one embodiment, the application shows a kind of driving circuit 11, including 111 He of horizontal drive circuit
Column drive circuit 112.Above controller 10 is defeated with the input terminal of the horizontal drive circuit 111 and the column drive circuit 112 respectively
Enter end connection, the output end of the horizontal drive circuit 111 is connect with the input terminal of above-mentioned one-way conduction circuit 12, the column drive circuit
112 output end is connect with above-mentioned absorption leadage circuit 13.
Wherein, the horizontal drive circuit of above-mentioned driving circuit may include PMOS tube, also may include NMOS tube, also can wrap
Include other devices；Optionally, column drive circuit may include serial shift register, be also possible to other devices.The present embodiment
Without limitation to the specific device type of horizontal drive circuit and column drive circuit.It illustratively, is that micro-control unit is with controller
Example, micro-control unit receive the picture from computer serial port and show information, are placed into frame memory, then press subregion driving
Series display data and scan control timing needed for mode generates LED display are respectively transmitted to horizontal drive circuit and column driving
Circuit, thus, diode array circuit completely realizes animation under the control of horizontal drive circuit and column drive circuit, such as flows
Water, gradual change, jump, the full-color variation such as video.
As shown in figure 4, in one embodiment, the application shows a kind of absorption leadage circuit 13, including the first absorption is let out
It puts sub-circuit 131 and second and absorbs sub-circuit 132 of releasing；First one end for absorbing sub-circuit 131 of releasing is grounded, first suction
The other end for receiving sub-circuit 131 of releasing is electric with the output end of above-mentioned one-way conduction circuit 12 and above-mentioned light emitting diode matrix respectively
The input terminal on road 14 connects；The second one end ground connection for absorbing sub-circuit 132 of releasing, this second absorbs and releases sub-circuit 132
The other end is connect with the output end of the input terminal of above-mentioned LED array circuit 14 and above-mentioned column drive circuit 112 respectively.
In the present embodiment, first, which absorbs sub-circuit of releasing, is connected between light emitting diode pipe array circuit and one-way conduction circuit, right
In from the electrostatic potential entered in the circuit in LED array circuit, by this, first to absorb sub-circuit of releasing quiet by this
Piezoelectric voltage is absorbed and is released from ground terminal.Second absorbs sub-circuit of releasing is driven by being connected to LED array circuit and column
Between dynamic circuit, for entering the electrostatic potential of the circuit either from the diode array circuit still from column drive circuit
The middle electrostatic potential into the circuit, the sub-circuit that can be released by second absorption are absorbed and are released from ground terminal.
In this way, the electrostatic protection in circuit can be realized effectively, reduce the harm of electrostatic bring.
Optionally, continuing the sub-circuit 131 as shown in figure 4, above-mentioned first absorption is released includes the first Anti-static device 1311,
Wherein, first Anti-static device 1311 one end ground connection, the other end respectively with the output end of above-mentioned one-way conduction circuit 12 and
Input terminal connection in above-mentioned LED array circuit 14.In the present embodiment, this first absorbs the to release in sub-circuit
One Anti-static device is connected under the action of electrostatic potential, it is released by ground connection then, prevents the electrostatic potential from damaging
Component.Wherein first Anti-static device can be one, can also be multiple, particular number according to the actual situation depending on, this
Embodiment does not limit this.Type the present embodiment of first Anti-static device also without limitation, as long as electrostatic can be absorbed
?.Optionally, with continued reference to Fig. 4, above-mentioned second absorbs the second Anti-static device that sub-circuit 132 of releasing includes multiple parallel connections
1321；Wherein, one end ground connection of each second Anti-static device 1321, the other end are electric with above-mentioned light emitting diode matrix respectively
The input terminal on road 14 is connected with the output end of above-mentioned column drive circuit 112.Wherein, this second absorb release it is multiple in sub-circuit
Second Anti-static device is connected under the action of electrostatic potential, it is released by ground connection equally, prevents the electrostatic potential from damaging
Evil component is identical as above-mentioned first Anti-static device, the number amount and type sheet of multiple second Anti-static devices in the embodiment
Embodiment also without limitation, as long as meeting the demand of actual circuit.
In this way, absorbing row driving using the first Anti-static device by absorbing in sub-circuit of releasing first in the present embodiment
Electrostatic potential between diode array circuit, by absorbing in sub-circuit of releasing second using multiple second parastats
Electrostatic potential between part absorption diode array circuit and column drive circuit, so that either from diode pin, also
It is that the electrostatic that driving circuit enters can be predominantly absorbed and be released by ground connection, so that the electrostatic effectively realized in circuit is anti-
Shield reduces the harm of electrostatic bring.
In view of electrostatic it is possible that entering from power end, horizontal drive circuit component is caused to damage, with continued reference to Fig. 4,
Optionally, above-mentioned absorption leadage circuit 13 further includes that third absorbs sub-circuit 133 of releasing；Wherein, third absorption is released sub electric
The one end on road 133 is grounded, and the other end is connect with the input terminal of power supply and above-mentioned horizontal drive circuit respectively.In the embodiment, third
Absorption sub-circuit of releasing is connected between power supply and horizontal drive circuit, for the electrostatic electricity entered in the circuit from luminous power end
The electrostatic potential is absorbed and is released from ground terminal by third absorption sub-circuit of releasing by pressure.Optionally, third absorption is let out
Putting sub-circuit 133 includes third Anti-static device 1331, and one end of the third Anti-static device 1331 is grounded, the other end respectively with
Power supply VCC is connected with the input terminal of the horizontal drive circuit 111.Wherein, the third which absorbs in sub-circuit of releasing is prevented quiet
Electrical part is connected under the action of electrostatic potential, and it is released by ground connection, prevents the electrostatic potential from entering row driving electricity
Path loss does harm to row driving tube.It is identical as above-mentioned first, second Anti-static device, multiple third Anti-static devices in the present embodiment
Amount and type the present embodiment is counted equally without limitation, as long as meeting the demand of actual circuit.In this way, the present embodiment by
Third absorbs in sub-circuit of releasing to be connected between power supply and horizontal drive circuit using third Anti-static device, so that from power end
The electrostatic of entrance is predominantly absorbed, and electrostatic potential damage horizontal drive circuit is avoided, to further realize in circuit
Electrostatic protection reduces the harm of electrostatic bring.
In order to avoid above-mentioned absorption leadage circuit is not thorough the electrostatic absorption generated in circuit, lead to some residual static electricities
Voltage damages the component in circuit, as shown in figure 5, in one embodiment, the application is also shown the second absorption of one kind and releases
Sub-circuit 132, the second resistance R2 including multiple parallel connections；One end of each second resistance R2 and corresponding second Anti-static device
ESD connection, the other end of each second resistance R2 are connect with the output end of above-mentioned column drive circuit 112.In the present embodiment, in electricity
There is also residual static electricity voltages in road, according to the Ohm's law residual static electricity voltage after above-mentioned multiple second resistance R2,
In the case of multiple second resistance R2 chooses suitable resistance value, which is consumed by multiple second resistance, to protect
The component in circuit will not be damaged by having demonstrate,proved the residual static electricity voltage in circuit.Wherein the quantity of second resistance is according to column
Depending on the reality output channel of driving circuit, the specific resistance value of the second resistance can be selected according to actual needs.The present embodiment pair
The quantity and resistance value size of multiple second resistance are without limitation.
It should be noted that three kinds in above-described embodiment quantity for absorbing sub-circuit of releasing specifically can be according to actually making
It is combined or is selected with demand, the application is not specifically limited.Above-described embodiment can be adapted for co-anode diode array
Scheme in, be readily applicable in the scheme of common cathode diode array, the present embodiment does not limit this.
Illustratively, as shown in fig. 6, the circuit includes that the 3rd ESD absorbs leadage circuit 133, the first ESD absorbs leadage circuit
131, the 2nd ESD absorb leadage circuit 132, horizontal drive circuit 111, one-way conduction circuit 12, LED array circuit 14,
And column drive circuit 112.Wherein, depending on the quantity of LED array circuit 14 scans number by actual LED display, this
Embodiment does not limit this.Wherein, the first ESD absorbs the ESD pipe quantity in leadage circuit 131 by column drive circuit 112
Column driving IC pipe reality output number of channels depending on, the present embodiment does not limit this.
In this example, circuit of the circuit when being free of ESD protection function is by horizontal drive circuit 111, light emitting diode battle array
Column circuits 14,122 three parts of column drive circuit composition are (as shown in fig. 6, the control circuit of the circuit uses square wave signal in figure
Indicate, do not showed that in the specific structure figure), the circuit without ESD protection function can normally realize all-colour LED display effect,
It absorbs and releases as shown in fig. 6, increasing the 3rd ESD absorption leadage circuit 133, one-way conduction circuit 12, the first ESD in the circuit
After circuit 131 and the 2nd ESD absorb leadage circuit 132, then the circuit may be implemented in atmospherical discharges (IEC mode-work normally
In the case of) in keep LED display performance it is constant while, by the electrostatic potential generated in the circuit absorb by ground connection release
Fall.Specifically, when having atmospherical discharges or other electrostatic are come in, what which initially entered is LED array circuit
The pin of light emitting diode in 14-cathode foot or anode foot, the electrostatic at this moment formed can absorb leadage circuit by the first ESD
ESD pipe 1311 and the 2nd ESD in 131 absorb multiple ESD pipes 1321 in leadage circuit 132 and absorb, and enter in power end
Electrostatic, which is then directly absorbed in leadage circuit 133 by the 3rd ESD, to be sponged.Because IC component used in LED display can be held
The operating voltage received is lower, after taking electrostatic protection measure, still has to absorb and is not thorough and remaining voltage makes row driving electricity
IC pipe in road 111 or the component damage failure in column drive circuit 112, therefore inhaled in one-way conduction circuit 12 and the 2nd ESD
Receive leadage circuit 132 in increase separately first resistor R1 and multiple second resistance R2, be based on Ohm's law, first resistor R1 and
Multiple second resistance R2 can absorb residual voltage, avoids damage of the residual static electricity voltage to component.In addition, for electricity
The current signal that parasitic capacitance between each device of road plate generates will also pass through the first resistor and be flowed into horizontal drive circuit 111
In metal-oxide-semiconductor in, wherein the first resistor may be selected 33 Ω -100 Ω, to meet the ghost function that disappears of display screen, and not shadow
Ring others display function.One-way conduction characteristic based on diode, the effect of the diode in above-mentioned one-way conduction circuit 12
It is one-way conduction signal and reverse protection effect, can guaranteeing that it is same in light emitting diode that the signal in horizontal drive circuit flows into
When, prevent electrostatic potential direction from entering in the horizontal drive circuit.
Fig. 7 is referred to, in one embodiment, the application shows a kind of antistatic mould group, which includes：Printed circuit
Plate PCB and the electrostatic discharge protection circuit as shown in any of the above embodiment, the electrostatic discharge protection circuit are arranged on the printed circuit board.
Optionally, the present embodiment includes printed circuit board, and light emitting diode (Light Emitting is wherein arranged on printed circuit board
Diode, abbreviation LED) luminescence unit, drive integrated circult (Integratedcircuit, abbreviation IC), row pipe MOS, TVS transient state
Suppressor, diode, resistance.Optionally, LED luminescence unit can be set on an end face of pcb board, optionally, LED hair
Flip-chip can be used in light unit.Driving IC, row pipe MOS are arranged on another end face opposite with LED luminescence unit.It is optional
Ground, driving IC, row pipe MOS can independent control each LED chips.Optionally, TVS transient suppressor, diode, resistance can also
With setting on end face identical with driving IC, row pipe MOS, also it can be set on another end face, the present embodiment is to TVS
The settable end face of transient suppressor, diode, resistance is without limitation.In order to save pcb board space and device arrangement it is excellent
Change, optionally, TVS transient suppressor can use All-in-One TVS, such as：4 unification TVS pipes, 8 unification TVS pipes etc., this implementation
Example does not limit this.In this way, because increasing the control circuit of TVS transient suppressor, diode, resistance to former display module
In, enable the display module to have the function of antistatic while normally display.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of electrostatic discharge protection circuit, which is characterized in that including：Controller, absorbs leadage circuit, light-emitting diodes at driving circuit
Pipe array circuit and one-way conduction circuit；The controller is connect with the input terminal of the driving circuit, the driving circuit
First output end is connect with the absorption leadage circuit, the second output terminal of the driving circuit and the one-way conduction circuit
Input terminal connection, the output end of the one-way conduction circuit and the absorption leadage circuit are electric with the light emitting diode matrix
The input terminal on road connects；
The absorption leadage circuit, for absorbing and releasing between the driving circuit and the LED array circuit
Electrostatic；
The one-way conduction circuit, for absorbing the electrostatic between the driving circuit and the LED array circuit,
And export one-way conduction signal.
2. circuit according to claim 1, which is characterized in that the one-way conduction circuit includes diode and the first electricity
Resistance；
The anode of the diode is connect with the second output terminal of the driving circuit, the cathode of the diode and the absorption
Leadage circuit connection, the both ends of the first resistor respectively with the second output terminal of the driving circuit and the absorption vent discharge
Road connection.
3. circuit according to claim 1 or 2, which is characterized in that the driving circuit includes that horizontal drive circuit and column drive
Dynamic circuit；
The controller is connect with the input terminal of the input terminal of the horizontal drive circuit and the column drive circuit respectively, the row
The output end of driving circuit is connect with the input terminal of the one-way conduction circuit, the output end of the column drive circuit and the suction
Receive leadage circuit connection.
4. circuit according to claim 3, which is characterized in that the absorption leadage circuit absorbs sub- electricity of releasing including first
Road and second absorbs sub-circuit of releasing；
It is described first absorb release sub-circuit one end ground connection, it is described first absorb release sub-circuit the other end respectively with it is described
The output end of one-way conduction circuit is connected with the input terminal of the LED array circuit；
It is described second absorb release sub-circuit one end ground connection, it is described second absorb release sub-circuit the other end respectively with it is described
The input terminal of LED array circuit is connected with the output end of the column drive circuit.
5. circuit according to claim 4, which is characterized in that described first, which absorbs sub-circuit of releasing, includes the first antistatic
Device；One end of first Anti-static device is grounded, and the other end of first Anti-static device is unidirectionally led with described respectively
The output end of circuit passband is connected with the input terminal in the LED array circuit.
6. circuit according to claim 4 or 5, which is characterized in that it is described second absorb release sub-circuit include it is multiple simultaneously
Second Anti-static device of connection；One end of each second Anti-static device is grounded, each second Anti-static device
The other end is connect with the output end of the input terminal of the LED array circuit and the column drive circuit respectively.
7. circuit according to claim 6, which is characterized in that described second to absorb sub-circuit of releasing further include multiple parallel connections
Second resistance；One end of each second resistance is connected with corresponding second Anti-static device, each second resistance
The other end connect with the output end of the column drive circuit.
8. circuit according to claim 4 or 5, which is characterized in that the absorption leadage circuit further includes that third absorption is let out
Put sub-circuit；
The third absorbs one end ground connection for sub-circuit of releasing, the third absorb the other end of sub-circuit of releasing respectively with power supply
It is connected with the input terminal of the horizontal drive circuit.
9. circuit according to claim 8, which is characterized in that it includes third antistatic that the third, which absorbs sub-circuit of releasing,
Device, one end ground connection of the third Anti-static device, the other end of the third Anti-static device respectively with power supply and described
The input terminal of horizontal drive circuit connects.
10. a kind of antistatic mould group, which is characterized in that including：Printed circuit board and such as claim 1-9 are described in any item quiet
Electric protection circuit, the electrostatic discharge protection circuit are arranged on the printed circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810926142.9A CN108925009A (en) | 2018-08-15 | 2018-08-15 | Electrostatic discharge protection circuit and antistatic mould group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810926142.9A CN108925009A (en) | 2018-08-15 | 2018-08-15 | Electrostatic discharge protection circuit and antistatic mould group |
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| Publication Number | Publication Date |
|---|---|
| CN108925009A true CN108925009A (en) | 2018-11-30 |
Family
ID=64404692
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810926142.9A Pending CN108925009A (en) | 2018-08-15 | 2018-08-15 | Electrostatic discharge protection circuit and antistatic mould group |
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