CN107633805A - Controller for LED display - Google Patents
Controller for LED display Download PDFInfo
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- CN107633805A CN107633805A CN201610551707.0A CN201610551707A CN107633805A CN 107633805 A CN107633805 A CN 107633805A CN 201610551707 A CN201610551707 A CN 201610551707A CN 107633805 A CN107633805 A CN 107633805A
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- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 15
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- 239000003990 capacitor Substances 0.000 description 2
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Abstract
The invention discloses a kind of controller for LED display, including：Decoder, the decoder have multiple inputs and multiple output ends, the decoder receive control data and output driving control signal；Multiple drive control devices, each in the multiple drive control device is connected to one in multiple output ends of the decoder, wherein each drive control device includes drive circuit and nmos switch, the output end of the drive circuit is connected to the grid of nmos switch, the drain electrode of the nmos switch is connected to supply voltage, output end of the source electrode of the nmos switch as the drive control device, the drive circuit are based on driving control signal driving nmos switch on or off.
Description
Technical field
The present invention relates to the controller of field of LED display, more particularly, to LED display.
Background technology
LED is widely used in the fields such as illumination, backlight, display.Large-size screen monitors are realized using LED as pixel
The advantages of curtain display, includes：Brightness is high, operating voltage is low, small power consumption, maximization, long lifespan, impact resistance and performance it is steady
Calmly, therefore it is using more and more extensive.
Fig. 1 shows a kind of circuit diagram of the control circuit of the LED display according to prior art
(CN103854598A).As shown in figure 1, LED display is arranged to make up by M row * N row LED matrixes.LED display
Control circuit include 30, three drive control circuits of LED display drive circuit, it is corresponding with drive control circuit perseverance
Circulation road group and multiple P-type mos (PMOS) switch.The inside structure of three drive control circuits
It is identical, and under the control of LED display drive circuit 30, drive the display of LED array.Shown in Fig. 1
P-MOS is switched, and is controlled by row power supply control port, is realized the power supply control line by line of LED array, single file LED anode
P-MOS drain electrode is interconnected to, the common cathode of single-row LED primary colours is interconnected to the constant current input of drive control circuit；
P-MOS source electrode is connected to feeder ear VCC, and grid is connected to the control port of LED display drive circuit 30；Aobvious
Under the control for showing drive circuit 30, a certain P-MOS drain electrode is opened, is this line LED anode supply, at the same it is permanent
Flow control signals output port controls the logic circuit of LED drive circuit, controls the orderly conducting of constant current array, realizes this
A line LED current is conducted to GND in order, realizes lighting in order for LED.
Further develop now with dot spacing, high density LED display technology, the control electricity for LED display
The technical sophistication degree on road is continuously increased, and causes LED display by integrated circuit technique, drive control, power technology
And the challenge in terms of reliability.
For example, in Fig. 1 control circuit, as the PMOS device of power switch, because its carrier is hole,
Mobility is low, and conducting resistance is high, when being applied to LED large screen displays, under same load current conditions, due to opening
It is big to close pipe PMOS conducting resistances, chip power-consumption can be caused to increase, temperature raises, and reduces the reliability of chip.
For in the prior art, the problem of control circuit area occupied of LED display is big, power consumption is big, not yet carry at present
Go out effective solution.
The content of the invention
For in the prior art, the problem of control circuit area occupied of LED display is big, power consumption is big, not yet carry at present
Go out effective solution, be to provide a kind of control circuit of LED display for this main object of the present invention, to solve
Above mentioned problem.
Switched using row driving power of the nmos switch as LED display.The carrier of nmos switch is electronics, and
The carrier of PMOS switch is hole, it is generally the case that electron mobility is 2~4 times of hole mobility, therefore
Under same load, the conductive capability of nmos switch is stronger.
On the other hand, under same conducting resistance parameter, the tube core of the die area of nmos switch than PMOS switch
Area it is much smaller, same wafer output capacity improves, so as to economize on resources and reduce cost.
According to an aspect of the present invention, there is provided a kind of controller for LED display, including：Decoder, it is described
Decoder has multiple inputs and multiple output ends, the decoder receive control data and output driving control letter
Number；Multiple drive control devices, each in the multiple drive control device are connected to multiple output ends of the decoder
In one, wherein each drive control device includes drive circuit and nmos switch, the output end of the drive circuit connects
The grid of nmos switch is connected to, the drain electrode of the nmos switch is connected to supply voltage, the source electrode of the nmos switch
As the output end of the drive control device, the drive circuit is based on driving control signal driving nmos switch and led
Logical or cut-off.
The controller also includes booster converter, and supply voltage is increased to converter voltage and provided by the booster converter
To drive circuit, the drive circuit is based on the driving control signal and opened using converter voltage driving NMOS
Close on or off.Booster converter can be charge pump.Booster converter can also be Switching Power Supply.
Further, the output voltage of booster converter voltage is at least the supply voltage and adds threshold value Vth。
Further, the output voltage of the booster converter voltage is twice of the supply voltage.
Further, the output end of each drive control device is connected to a line or multirow of LED display panel.
Further, the nmos switch is multiple nmos transistor switches being connected in parallel, each nmos pass transistor
The grid of switch is connected to the output end of the drive circuit, and the drain electrode of each nmos transistor switch is connected to power supply electricity
Pressure, the output end of the source electrode of each nmos transistor switch as the drive control device.
Further, the drive control device also includes protection circuit.
Further, the drive circuit includes：The first transistor, second transistor, third transistor, the 4th crystal
Pipe, the 5th transistor, the 6th transistor and phase inverter, wherein the first transistor, second transistor and third transistor
Source electrode be respectively connecting to the converter voltage of booster converter output, wherein the 4th transistor, the 5th transistor and
The source electrode of 6th transistor is grounded respectively, and the drain electrode of wherein the first transistor, the 6th transistor is respectively connecting to drive circuit
Output end, wherein the first transistor, the 6th transistor gate be connected to a node, wherein the drain electrode of second transistor,
The drain electrode of the grid of third transistor and the 5th transistor is connected with each other and is connected to the node, wherein second transistor
Grid, the drain electrode of third transistor and the drain electrode of the 4th transistor are connected with each other, wherein the input of the drive circuit connects
The input of phase inverter and the grid of the 4th transistor are connected to, the output end of the phase inverter is connected to the 5th transistor
First output end of grid, wherein drive circuit is connected to the grid of nmos switch.
Further, the first transistor, second transistor and third transistor are P-type mos transistor；
4th transistor, the 5th transistor and the 6th transistor are N-type metal oxide semiconductor transistor.
Further, the decoder is 3-8 decoders, and the 3-8 decoders receive three binary codes and eight
Individual output exports eight outputs level signals to corresponding drive control device.
Further, the decoder is 2-4 decoders, and the 2-4 decoders receive two binary codes and four
Individual output exports four outputs level signals to corresponding drive control device.
Further, the decoder is 4-16 decoders, the 4-16 decoders receive four binary codes and
16 outputs export 16 outputs level signals to corresponding drive control device.
Further, the controller also includes blanking control circuit and controllable discharge circuit, the controllable discharge circuit connection
Between the source electrode of nmos switch and draw power, the blanking control circuit be connected to the grid of nmos switch with it is controllable
Between discharge circuit.
Compared with being switched by the use of PMOS switch as row driving power, the present invention is used as LED display by the use of nmos switch
Row driving power switch have the following advantages that：1) because nmos switch is using electronics as carrier, mobility is high,
Conductive capability is strong, the nmos switch formed on same semiconductor chip area, can reduce the conducting resistance of power switch；
2) because the die area shared by the nmos switch of equal performance is much smaller than the chip area shared by PMOS switch,
To realize that the chip area needed for identical conducting electric current nmos switch is small, same wafer output capacity improves, so as to
The cost of LED drive circuit is reduced, and is advantageous to the further miniaturization of the control circuit of LED display.
Brief description of the drawings
For the above and other advantages and features of each embodiment that the present invention is furture elucidated, this is presented in refer to the attached drawing
The more specifically description of each embodiment of invention.It is appreciated that these accompanying drawings only describe the exemplary embodiments of the present invention, because
This is not to be regarded as being restriction on its scope.In the accompanying drawings, in order to cheer and bright, identical or corresponding part will use phase
Same or similar mark represents.
Fig. 1 is the circuit diagram according to the control circuit of the LED display of prior art.
Fig. 2 is the block diagram of the control system 200 according to an embodiment of the invention for LED display.
Fig. 3 is the block diagram of the line control unit 300 according to an embodiment of the invention for LED display.
Fig. 4 is the block diagram of one embodiment 400 of the drive control device in the line control unit according to Fig. 3 of the present invention.
Fig. 5 is the frame of another embodiment 500 of the drive control device in the line control unit according to Fig. 3 of the present invention
Figure.
Fig. 6 shows the frame of circuit 600 that drive control device according to an embodiment of the invention is connected with booster converter
Figure.
Fig. 7 shows one embodiment of the physical circuit figure of the drive circuit 501 in drive control device shown in Fig. 5.
Fig. 8 shows the block diagram of charge pump 800 according to an embodiment of the invention.
Fig. 9 shows the line control circuit 900 that booster converter according to an embodiment of the invention is combined with line control unit
Block diagram.
Figure 10 shows according to an embodiment of the invention to include blanking control circuit 1003 and controllable discharge circuit 1004
Drive control device partial circuit block diagram.
Figure 11 shows that the present invention is used for the structured flowchart of the controller of LED display.
Embodiment
In the following description, with reference to each embodiment, present invention is described.However, those skilled in the art will recognize
Know can in the case of neither one or multiple specific details or with it is other replacement and/or addition method, material or group
Part implements each embodiment together.In other situations, be not shown or known structure be not described in detail, material or operation with
Exempt to make the aspects of various embodiments of the present invention obscure.Similarly, for purposes of explanation, specific quantity, material are elaborated
Material and configuration, to provide the comprehensive understanding to embodiments of the invention.However, the present invention can be in no specific detail
In the case of implement.Further, it should be understood that each embodiment shown in accompanying drawing is illustrative expression and is not drawn necessarily to scale.
In this manual, the reference to " one embodiment " or " embodiment " means that combining the embodiment describes
Special characteristic, structure or characteristic be included at least one embodiment of the invention.In this specification middle appearance everywhere
Phrase be not necessarily all referring to the same embodiment " in one embodiment ".
The element of LED display is by parts such as LED display panel, control system, power-supply system, frameworks
Composition.LED display control system is the core component of LED graphic display screens.LED display control system, which receives, to be come
From the image display information of input port, frame memory is inserted, as the string needed for subregion type of drive generation LED display
Row display data and scan control sequential.
Fig. 2 is the block diagram of the control system 200 according to an embodiment of the invention for LED display.Such as Fig. 2
It is shown, control system 200 include image processing apparatus 201, one or more line control unit 202-1 to 202-N (N >=
And one or more row controller 203-1 to 203-M (M >=1) 1).Image processing apparatus 201 passes through input port
Image information is received, it is handled to form the row control data and row control data that are collocated with each other, and respectively by it
It is output to one or more line control unit 202-1 to 202-N and one or more row controller 203-1 to 203-M.
One or more line control unit 202-1 to 202-N and one or more row controller 203-1 to 203-M are respectively to row
Control data and row control data enter row decoding and form row and column driving control signal based on the control data through decoding, with
The row and column of LED display panel 204 is driven, so as to form image in LED display panel.
Fig. 3 is the block diagram of the line control unit 300 according to an embodiment of the invention for LED display.Such as Fig. 3
Shown, line control unit 300 may include decoder 301, drive control device 302-1 to drive control device 302-L.Decoding
Device 301 receives row control data and enters row decoding to it, with its output output driving control signal.Drive control
Device 302-1 to drive control device 302-L is respectively connecting to an output end of decoder 301.Drive control device 302-1
Internal circuit configuration to drive control device 302-L is essentially identical, and their output end 305-1 to 305-L difference
It is connected to a line or multirow of LED display panel.Drive control device 302-1 to drive control device 302-L is based on from decoding
The driving control signal that device receives controls whether one to the LED display panel being connected with its output end 305-1 to 305-L
Row or multirow power supply.
In one embodiment of the invention, line control unit 300 may also include biasing circuit 303.Biasing circuit 303 connects
Each in drive control device 302-1 to drive control device 302-L is connected to, and is extremely driven to drive control device 302-1
Controller 302-L provides required bias current or bias voltage.
In one embodiment of the invention, decoder 301 can be 3-8 decoders.In this case, decoder
301 can receive three binary codes and convert thereof into eight outputs level signals of output.Eight outputs level signals point
Drive control device 302-1 to 302-8 is not provided to.In normal operation, the value based on three inputs, 3-8
One in eight outputs level signals of decoder is high level.In another embodiment of the present invention, decoder 301
Can be 2-4 decoders or 4-16 decoders.However, the decoder used in the present invention is not limited to above-mentioned decoder
Type, as long as the decoder can be used to enter LED display panel in the decoder that every trade control can be used as the present invention.
In one embodiment of the invention, controller 300 can also include logic unit 304, the logic unit 304
As the internal signal control terminal of controller 300, internal logic processing is carried out, so as in a particular state by drive control
Device 302-1 to drive control device 302-N output are all off.
Fig. 4 shows one embodiment 400 of the drive control device in the line control unit 300 according to Fig. 3 of the present invention
Block diagram.As shown in figure 4, drive control device 400 includes drive circuit 401 and nmos switch 402.Drive circuit
401 output end 411 is connected to the grid of nmos switch 402.The source S of nmos switch 402 as output end 405,
The drain D of nmos switch 402 is connected to supply voltage VDD.Drive circuit 401 is received in first input end 406 and come from
The driving control signal of decoder 301, and the level based on driving control signal determines whether nmos switch 402
Grid provides driving voltage, so as to control the on or off of nmos switch 402.When nmos switch 402 turns on,
Power vd D is powered by nmos switch 402 for a line or multirow of LED display panel.When nmos switch 402 ends
When, power vd D can not be powered by nmos switch 402 for a line or multirow of LED display panel.
Drive circuit 401 can have the second input 407, for receiving the driving voltage needed for driving nmos switch 402,
The second input 407 of the driving voltage of nmos switch 402 and drive circuit 401 will be hereinafter described in detail.
In an embodiment of the present invention, switched using row driving power of the nmos switch 402 as LED display.NMOS
The carrier of switch is electronics, and the carrier of PMOS switch is hole, it is generally the case that electron mobility is hole
2~4 times of mobility, therefore under same load current, the conductive capability of nmos switch is stronger.
Compared with the drive control device switched by the use of PMOS switch as row driving power, LED is used as by the use of nmos switch
The row driving power switch of display screen has the following advantages that：1) because nmos switch is using electronics as carrier, migration
Rate is high, and conductive capability is strong, the nmos switch formed on same semiconductor chip area, can reduce leading for power switch
Be powered resistance；2) because the die area shared by the nmos switch of equal performance is much smaller than the core shared by PMOS switch
Piece area, to realize that the chip area needed for identical conducting electric current nmos switch is small, same wafer output capacity improves,
So as to reduce the cost of LED drive circuit, and be advantageous to the further miniaturization of the control circuit of LED display.
Fig. 5 is another embodiment 500 of the drive control device in the line control unit 300 according to Fig. 3 of the present invention
Block diagram.As shown in figure 5, drive control device 500 includes drive circuit 501, one or more nmos switches 502
And protection circuit 503.Protection circuit 503 receives the drive control exported from decoder 301 in first input end 506
Signal and monitor the output end 511 of drive circuit 501 and the output end 505 of drive control device 500.When protection electricity
Road 503 detects that voltage at input 506, output end 511 and output end 505 and/or electric current are more than specific threshold
When, protection circuit 503 performs defencive function.Drive circuit 501 can have the second input 507, be driven for receiving
Driving voltage needed for nmos switch 502, hereinafter by the second input 507 of the driving voltage of drive circuit 501
It is described in detail.
In one embodiment of the invention, one or more nmos switches 502 can be multiple NMOS being connected in parallel
Switch, the output end 511 of drive circuit 501 be connected to the grid of each in these nmos switches 502 and to its
Gate drive voltage is provided.The source S of each in nmos switch 502 is connected to output end 505, nmos switch
The drain D of each in 502 is connected to supply voltage VDD.Based on the voltage level at the grid of nmos switch 502,
Whether control nmos switch 502 turns on, so as to control whether a line or multirow power supply to LED display panel.One
In individual embodiment, one or more nmos switches 502 can be 800 nmos switches being connected in parallel, so as to allow
Electric current needed for a line or multirow of driving LED display panel flows through.In another embodiment, one or more NMOS
Switch 502 can also be 400,600 or 1000 nmos switches being connected in parallel.One or more nmos switches 502
Quantity depend on driving LED display panel a line or multirow needed for size of current and each nmos switch crystal
The characteristic of pipe.As long as the nmos switch can allow for LED display panel a line or multirow needed for electric current flow through
Nmos switch 502 as the present invention, without being limited by its quantity.
As shown in Figure 4 and Figure 5, for nmos switch 402 or 502, as the grid voltage V of nmos switchGCompare NMOS
The source voltage of switch exceeds specific threshold VthWhen, nmos switch can turn on, thus when the source voltage of nmos switch
For supply voltage VDD when, to turn on the nmos switch, the grid voltage of nmos switch needs to meet VG≥VDD+Vth。
Therefore, in order to drive nmos switch to turn it on, it is necessary to which the grid in nmos switch provides sufficiently high grid voltage VG。
In one embodiment, grid voltage can be arranged to：VG=2VDD.
In an embodiment of the present invention, for grid voltage V needed for providingG, a booster converter can be set.Boosting
Converter is used to supply voltage VDD boosting to converter voltage VPPI so that VPPI >=VDD+Vth.In an implementation
In example, VPPI=2VDD.Converter voltage VPPI is supplied to the second of drive circuit 401 or 501 by booster converter
Input 407 or 507.Level of the drive circuit 401 or 501 based on driving control signal determines whether nmos switch
Grid provide converter voltage VPPI, so as to control the on or off of nmos switch.
Fig. 6 shows the circuit block according to an embodiment of the invention that boosting inverter is integrated into drive control device 600
Figure.As shown in fig. 6, booster converter 601 carries out boosting inverter to supply voltage to form converter voltage VPPI, and
Converter voltage VPPI is supplied to drive circuit 401 or 501, drive circuit 401 or 501 utilizes converter voltage
VPPI drives the grid of nmos switch.
In an embodiment of the present invention, booster converter and drive control device can be integrated on same tube core and be controlled as row
A part for device, or booster converter can be integrated into drive control device as a part for drive control device.At this
In another embodiment of invention, IC chip that booster converter is a separately formed, controlled with drive control device or row
Device processed separation, and converter voltage is supplied to by special interface the drive circuit in drive control device.In the present invention
Another embodiment in, may not include booster converter, line control unit passes through needed for special interface received from external power source
Driving voltage.
Fig. 7 shows one embodiment of the physical circuit figure of the drive circuit 501 in drive control device shown in Fig. 5.Such as figure
Shown in 7, drive circuit 501 includes superposed the first transistor 701, second transistor 702 and third transistor
703, and the 4th transistor 704, the 5th transistor 705 and the 6th transistor 706 positioned at bottom.Drive circuit 501
Also include phase inverter 708.The first transistor 701, second transistor 702 and third transistor 703 are p-type metal oxygen
Compound semiconductor transistor.The source electrode of the first transistor 701, second transistor 702 and third transistor 703 connects respectively
It is connected to the converter voltage VPPI of booster converter output.4th transistor 704, the 5th transistor 705 and the 6th crystal
Pipe 706 is N-type metal oxide semiconductor transistor.4th transistor 704, the 5th transistor 705 and the 6th crystal
The source electrode of pipe 706 is respectively connecting to ground nodes GND.The drain electrode difference of the transistor 706 of the first transistor 701 and the 6th
It is connected to the output end 511 of drive circuit 501.The grid of the transistor 706 of the first transistor 701 and the 6th is connected to section
Point 707.Node 707 can be as the second output end 512 of drive circuit 501.Second output end 512 provide with it is defeated
Go out the opposite inversion signal of the output signal at end 511.The drain electrode of second transistor 702, the grid of third transistor 703
Drain electrode with the 5th transistor 705 is connected with each other and is connected to node 707.The grid of second transistor 702, the 3rd crystalline substance
The drain electrode of body pipe 703 is connected with each other with the drain electrode of the 4th transistor 704.The input of drive circuit 501 is connected to anti-phase
The grid of the input of device 708 and the 4th transistor 704, the output end of phase inverter 708 are connected to the 5th transistor 705
Grid.
First output end 511 of drive circuit 501 is connected to the grid of nmos switch 402 or 502.Drive circuit 501
Whether the electrical level judging based on input signal by voltage VPPI is supplied to the first output end 511, so that nmos switch
402 or 502 on or off.
Turning now to Fig. 6, in one embodiment of the invention, booster converter 601 can be charge pump.In this hair
In another bright embodiment, booster converter 601 can also be Switching Power Supply.However, the booster converter of the present invention
Scope be not limited to these examples listed herein, as long as supply voltage can be boosted to required high driving voltage
As booster converter of the present invention.
Fig. 8 shows the block diagram of charge pump 800 according to an embodiment of the invention.Charge pump 800 includes oscillator
801st, pump capacitor 802, logic controller 803 and output voltage controller 804.Charge pump 800 is by controller
Pump capacitor is powered or powered off to carry out voltage conversion.
Fig. 9 shows the line control circuit 900 that booster converter according to an embodiment of the invention is combined with line control unit
Block diagram.As shown in figure 9, supply voltage is supplied to by booster converter 901 by filter regulator circuit 903 first,
Supply voltage is boosted to required converter voltage VPPI and provides converter voltage VPPI by booster converter 901
To the drive circuit in line control unit 902, drive circuit drives the grid of nmos switch using converter voltage VPPI.
Circuit 900 also includes being arranged on the electrostatic discharge protective circuit 904 at the input and output pin of line control circuit 900, from image
The row control data of processor output is sent to line control unit 902 by electrostatic discharge protective circuit 904, through line control unit 902
Power switch is driven to enter every trade control to LED display panel after decoding.
In actual applications, each output end of line control unit may be connected to a line or multirow of LED display panel, according to
Decoder model in line control unit, specific line control unit can control the certain amount of row of LED display panel.For example,
In the case that decoder is 3-8 decoders, a line control unit can have eight output ends, and each output end controls LED
A line or multirow of display panel；In the case where decoder is 2-4 decoders, a line control unit has four outputs
End, a line or multirow of each output end control LED display panel.According to the actual size of LED display panel, can lead to
Cross outside control multiple line control units cascade up, realize the drive control of LED large screen displays.
Figure 10 shows according to an embodiment of the invention to include blanking control circuit 1003 and controllable discharge circuit 1004
Drive control device local circuit block diagram.As shown in Figure 10, the output end of drive circuit 1001 is connected to nmos switch
1002 grid.The source S of nmos switch 1002 is connected to output end 1005, the drain electrode connection of nmos switch 1002
To supply voltage VDD.Controllable discharge circuit 1004 is connected to the source S and draw power Vdc of nmos switch 1002
Between.Controllable discharge circuit 1004 be used for the source S of nmos switch 1002 when nmos switch 1002 turn off and
Draw power is connected, so as to discharge the source S of nmos switch 1002.Blanking control circuit 1003 is connected to
Between the grid and controllable discharge circuit 1004 of nmos switch 1002.When the control signal of the grid of nmos switch 1002 is
During off state, blanking control circuit 1003 exports drop-down pulse to controllable discharge circuit 1004.Controllable discharge circuit 1004
When receiving drop-down pulse, the source S of nmos switch 1002 is connected to draw power, to nmos switch 1002
Source S discharged.Controllable discharge circuit 1004 is when being not received by drop-down pulse, by nmos switch 1002
Source S be set to high-impedance state, stop discharging to the source S of nmos switch 1002.
Although described above is various embodiments of the present invention, however, it is to be understood that they are intended only as example to present,
And without limitation.For those skilled in the relevant art it is readily apparent that various combinations, modification can be made to it
With change without departing from the spirit and scope of the present invention.Therefore, the width of the invention disclosed herein and scope should not be by
Above-mentioned disclosed exemplary embodiment is limited, and should be determined according only to appended claims and its equivalent substitution
Justice.
Claims (15)
- A kind of 1. controller for LED display, it is characterised in that including：Decoder, the decoder have multiple inputs and multiple output ends, and the decoder receive control data is simultaneously Output driving control signal；Multiple drive control devices, each in the multiple drive control device are connected to multiple output ends of the decoder In one,Wherein each drive control device includes drive circuit and nmos switch, and the output end of the drive circuit is connected to The grid of nmos switch, the drain electrode of the nmos switch are connected to supply voltage, and the source electrode of the nmos switch is as institute The output end of drive control device is stated, the drive circuit is based on driving control signal driving nmos switch conducting or cut Only.
- 2. it is used for the controller of LED display as claimed in claim 1, it is characterised in that also including booster converter, Supply voltage is increased to booster converter voltage and is supplied to drive circuit by the booster converter, the drive circuit base In the driving control signal and utilize booster converter voltage driving nmos switch on or off.
- 3. it is used for the controller of LED display as claimed in claim 2, it is characterised in that the booster converter is Charge pump.
- 4. it is used for the controller of LED display as claimed in claim 2, it is characterised in that the booster converter is Switching Power Supply.
- 5. it is used for the controller of LED display as claimed in claim 2, it is characterised in that the booster converter is defeated Go out voltage and be at least the supply voltage to add threshold value Vth。
- 6. it is used for the controller of LED display as claimed in claim 2, it is characterised in that the booster converter is defeated Go out twice that voltage is the supply voltage.
- 7. the controller for LED display as described in any one of claim 1 to 6, it is characterised in that every The output end of the individual drive control device is connected to a line or multirow of LED display panel.
- 8. the controller for LED display as described in any one of claim 1 to 6, it is characterised in that institute It is multiple nmos transistor switches being connected in parallel to state nmos switch, and the grid of each nmos transistor switch is connected to The output end of the drive circuit, the drain electrode of each nmos transistor switch are connected to supply voltage, each NMOS crystal The source electrode of pipe switch is connected to the output end of the drive control device.
- 9. the controller for LED display as described in any one of claim 1 to 6, it is characterised in that institute Stating drive control device also includes protection circuit.
- 10. the controller for LED display as described in any one of claim 2 to 6, it is characterised in that The drive circuit includes：The first transistor, second transistor, third transistor, the 4th transistor, the 5th transistor, 6th transistor and phase inverter,The source electrode of wherein the first transistor, second transistor and third transistor is respectively connecting to the booster converter output Converter voltage,The source electrode of wherein the 4th transistor, the 5th transistor and the 6th transistor is grounded respectively,The drain electrode of wherein the first transistor, the 6th transistor is respectively connecting to the output end of drive circuit,Wherein the first transistor, the 6th transistor gate are connected to a node,The drain electrode of the wherein drain electrode of second transistor, the grid of third transistor and the 5th transistor is connected with each other and is connected to The node,Wherein the grid of second transistor, the drain electrode of third transistor and the drain electrode of the 4th transistor are connected with each other,The input of wherein described drive circuit is connected to the input of phase inverter and the grid of the 4th transistor, described anti- The output end of phase device is connected to the grid of the 5th transistor,First output end of wherein drive circuit is connected to the grid of nmos switch.
- 11. it is used for the controller of LED display as claimed in claim 10, it is characterised in that the first transistor, the Two-transistor and third transistor are P-type mos transistor；4th transistor, the 5th transistor and Six transistors are N-type metal oxide semiconductor transistor.
- 12. it is used for the controller of LED display as claimed in claim 1, it is characterised in that the decoder is 3-8 Decoder, the 3-8 decoders receive three binary codes and export eight outputs level signals in eight outputs To corresponding drive control device.
- 13. it is used for the controller of LED display as claimed in claim 1, it is characterised in that the decoder is 2-4 Decoder, the 2-4 decoders receive two binary codes and export four outputs level signals in four outputs To corresponding drive control device.
- 14. it is used for the controller of LED display as claimed in claim 1, it is characterised in that the decoder is 4-16 Decoder, the 4-16 decoders receive four binary codes and export 16 output electricity in 16 outputs Ordinary mail number drive control device corresponding to.
- 15. the controller for LED display as described in any one of claim 1 to 6, it is characterised in that Also include blanking control circuit and controllable discharge circuit, the controllable discharge circuit is connected to the source electrode of nmos switch with Between drawing power supply, the blanking control circuit is connected between the grid of nmos switch and controllable discharge circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610551707.0A CN107633805A (en) | 2016-07-14 | 2016-07-14 | Controller for LED display |
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| CN201610551707.0A CN107633805A (en) | 2016-07-14 | 2016-07-14 | Controller for LED display |
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