CN106297652A - LED display and protection circuit thereof and control method - Google Patents
LED display and protection circuit thereof and control method Download PDFInfo
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- CN106297652A CN106297652A CN201610877564.2A CN201610877564A CN106297652A CN 106297652 A CN106297652 A CN 106297652A CN 201610877564 A CN201610877564 A CN 201610877564A CN 106297652 A CN106297652 A CN 106297652A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
This application discloses LED display and protection circuit thereof and control method.Described protection circuit includes: filter circuit, is used for receiving clock signal, and is filtered clock signal producing the second output enable signal；Logic circuit, it is connected with described filter circuit, signal is enabled for receiving described second output, and receive the first output and enable signal, and enable signal generation the 3rd output enable signal according to the first output enable signal and the second output, wherein, described 3rd output enables signal and drives electric current for enabling or disabling to provide to the LED of described LED display.This protection circuit disables LED display when communication abnormality, thus improves image and show and reduce LED screen power consumption and extend the LED screen life-span.
Description
Technical field
The present invention relates to LED Display Technique, more particularly, to LED display and protection circuit thereof and control method.
Background technology
The pixel element used at LED display is LED.LED display has a superiority of following aspect: high gray scale,
Wide visible angle, abundant color and customizable screen shape.Therefore, LED display is widely used in industry, friendship
The every field such as logical, commercial advertisement, information issue, sports tournament.In LED display, electric current control method can be used and lead
Logical time control act realizes multi-stage grey scale.In electric current control method, control it by the size of current flow through in regulation LED
Gray scale.In ON time control methods, maintain constant-current driving, control the gray scale of LED by changing dutycycle.
In actual product, it is widely used the ON time control methods that timesharing by turn shows, according to gradation data
Show multi-stage grey scale.To this end, in LED display screen system, control end and communicate with display screen end, latter provides data
Signal and control signal.This control signal such as includes clock signal, enables signal and latch signal.Driving of LED display end
Galvanic electricity road receives data signal, and latches under control of the control signal.The drive circuit of LED display end is according to number
The LED of correspondence is lighted/extinguished to the number of it is believed that, to realize the display of image information.
But, LED display is frequently present of the situation that communication abnormality interrupts, such as, because the reason such as fault or power failure is made
Become to control end when quitting work, or the holding wire controlling end and display screen end comes off.Now, the latch data of LED display end
Do not reset, owing to saving the data before communication disruption, LED display there will be mistake display content or full frame at random
Flicker or image are chaotic.The communication abnormality of display screen interrupts not only resulting in image display mistake, and when LED may be caused long
Between light, cause LED screen power consumption increase with reduce LED service life reduction.
Summary of the invention
In view of the above problems, it is an object of the invention to provide a kind of LED display and protection circuit thereof and control method,
Wherein use protection circuit disable LED display when communication abnormality, thus improve image show and reduce LED screen power consumption with
Extend the LED screen life-span.
According to the first aspect of the invention, it is provided that a kind of control method for LED display, described LED display bag
Including the multiple LED as pixel, described method includes: provide serial data signal, clock signal and the first output to enable signal；
Described clock signal is filtered produces the second output and enables signal；Enable signal according to the first output and the second output makes
The 3rd output enable signal can be produced by signal；And provide driving electric current according to described serial data signal to the plurality of LED,
Wherein, described 3rd output enable signal is used for enabling or disabling provides driving electric current to described LED.
Preferably, when described first output enables signal and described second output enable signal is all effective, the described 3rd
It is effective that output enables signal, and any one is invalid to enable signal at described first output enable signal and described second output
Time, described 3rd output enables invalidating signal.
Preferably, described first output enables signal and described second output enable circuit is effective when high level, described
3rd enable signal is effective when low level.
According to the second aspect of the invention, it is provided that a kind of LED display, including: LED display controller, it is used for providing string
Row data signal, clock signal and the first output enable signal；LED protection circuit, is connected with described LED display controller,
Enable signal according to described clock signal and described first output and produce described 3rd output enable signal；And multiple LED drives
Galvanic electricity road, is connected with described LED display controller and described LED protection circuit, provides according to described serial data signal and drives
Streaming current, multiple LED, it is connected with the plurality of LED drive circuit, and lights under the effect driving electric current, thus make
Pixel for described LED display.
Preferably, the corresponding set of LED during the plurality of LED drive circuit drives the plurality of LED respectively.
Preferably, the plurality of LED drive circuit cascades with one another connection, and is arranged on multiple LED unit plate.
Preferably, the plurality of LED drive circuit includes the first LED drive circuit of neighbouring described LED display controller,
Described LED drive circuit is between described LED display controller and described first LED drive circuit, thus to the plurality of
LED drive circuit provides public described 3rd output to enable signal.
Preferably, described LED protection circuit includes multiple protection module, and the plurality of protection module is respectively with the plurality of
LED drive circuit is connected, thus provides respective described 3rd output to enable letter respectively to the plurality of LED drive circuit
Number.
Preferably, the plurality of LED drive circuit is integrated in same chip with a corresponding protection module respectively.
Preferably, the plurality of LED drive circuit includes respectively: constant-current source circuit, for according to serial data signal, to
The outfan of LED drive circuit provides and drives electric current；And output enables circuit, for enabling letter according to described 3rd output
Number, enable or disable described constant-current source circuit.
Preferably, described constant-current circuit includes: constant-current source, for producing the electric current of constant as driving electric current；With
And switching tube, it is connected in series with described constant-current source, when described switching tube turns on, the outfan at LED drive circuit provides institute
State driving electric current.
Preferably, described output enables circuit and includes: not gate, is used for receiving described 3rd output and enables signal, and produces
Raw described 3rd output enables the inversion signal of signal；And with door, for receive described 3rd output enable signal anti-phase
Signal and described serial data signal, and provide switch controlling signal to described switching tube, to control described switching tube
Conducting state.
Preferably, described LED drive circuit also includes: shift register, for moving described serial data signal
Position and storage multi-bit digital value；And latch, it is used for temporarily depositing and enabling circuit to described output providing described many
Bit digital value, wherein, described LED display controller provides described clock signal and described serial data to described shift register
Signal, described LED display controller provides latch signal to described latch.
According to the third aspect of the invention we, it is provided that a kind of protection circuit for LED display, including: filter circuit, use
In receiving clock signal, and it is filtered clock signal producing the second output enable signal；Logic circuit, with described filter
Wave circuit is connected, and is used for receiving described second output and enables signal, and receives the first output and enable signal, and according to the
One output enables signal and the second output enables signal generation the 3rd output and enables signal, and wherein, described 3rd output enables to be believed
Number for enable or disable to described LED display LED provide drive electric current.
Preferably, described filter circuit includes in RC filter circuit, LC filter circuit, active low-pass filter circuit
A kind of.
Preferably, the work of described logic circuit makes to enable signal and described second output enable in described first output
Signal all effectively time, it is effective that described 3rd output enables signal, and enables signal and described second defeated in described first output
Go out to enable signal any one invalid time, described 3rd output enable invalidating signal.
Preferably, described logic circuit is NAND gate, and described first output enables signal and described second output enables electricity
When high level effectively, described 3rd enable signal is effective when low level on road.
LED protection circuit according to embodiments of the present invention, by detection clock signal, produces the second output and enables signal, enter
One step enables signal according to the first output and the second output enables signal generation the 3rd output and enables signal.LED drive circuit root
Enable signal according to the 3rd output and enable or disable outfan.Therefore, the communication between LED display controller and LED unit plate
During disconnection, enable signal due to the first output and the second output enables signal and is disarmed state, therefore can disable LED and drive
The outfan of circuit, until communication recovery is normal.
Further, LED display according to embodiments of the present invention and control method, use LED protection circuit to realize LED
Automatically shutting down during display screen no signal, thus ensure that LED display occurs without error image.Circuit of the present invention is simple, real
With, reliable, both extended the service life of light emitting diode, also reduced the energy consumption of system simultaneously.
Accompanying drawing explanation
By description to the embodiment of the present invention referring to the drawings, above-mentioned and other purposes of the present invention, feature and
Advantage will be apparent from.
Fig. 1 is the schematic block diagram of the LED display according to prior art；
Fig. 2 is the schematic block diagram of the LED display according to the embodiment of the present invention；
Fig. 3 is shown in the LED display shown in Fig. 2 the schematic block diagram of the LED drive circuit used；
Fig. 4 is shown in the LED display shown in Fig. 2 the schematic block diagram of the LED protection circuit used；
Fig. 5 illustrates the working waveform figure of LED display according to embodiments of the present invention.
Detailed description of the invention
It is more fully described various embodiments of the present invention hereinafter with reference to accompanying drawing.In various figures, identical element
Same or similar reference is used to represent.For the sake of clarity, the various piece in accompanying drawing is not necessarily to scale.
The present invention can present in a variety of manners, some of them example explained below.
Fig. 1 is the schematic block diagram of the LED display according to prior art.LED display screen system 100 includes that LED shows
The LED unit plate 120-1 to 120-N of controller 110 and N number of concatenation, wherein N is greater than the integer equal to 1.
Each LED unit plate includes that A LED drive circuit, each LED drive circuit are used for driving B LED, wherein A
The integer equal to 1 it is greater than respectively with B.Therefore, this LED display can drive N*A*B LED altogether.
LED display controller provides serial data signal SDI to LED unit plate 120-1, and respectively to LED unit plate
120-1 provides one group of control signal to LED unit plate 120-N, makes including clock signal clk, latch signal LE and first output
Can signal OE.The first LED drive circuit on first LED unit plate 120-1 receives serial data signal from LED display controller
SDI, and after displacement and latching, the next LED in serial data signal SDI output to this cell board is driven electricity
Road.Each LED drive circuit produces output signal according to the serial data signal SDI latched.LED unit plate 120-1 to LED
LED drive circuit in cell board 120-N enables signal OE according to the first output and provides driving electric current.LED is according to timesharing by turn
The mode of display is lighted or extinguishes, to realize the display of image information.
Such as, in ON time control methods, in order to show a two field picture, provide 16 ashes for each LED pixel
Degrees of data D [0:15].Each of gradation data D [0:15] effectively shows the time corresponding to different weights, and its weight uses
2nT represents, wherein n represents data bit.From 16 gradation datas, extract a bit data by turn, be divided into 16 times and light/extinguish
Corresponding LED.This LED lights the effective time cumulative gradation effect gray level as this pixel.
Fig. 2 is the schematic block diagram of the LED display according to the embodiment of the present invention.LED display screen system 200 includes LED
The LED unit plate 220-1 to 220-N of display controller 210 and N number of concatenation, wherein N is greater than the integer equal to 1.
Each LED unit plate includes that A LED drive circuit, each LED drive circuit are used for driving B LED, wherein A
The integer equal to 1 it is greater than respectively with B.Therefore, this LED display can drive N*A*B LED altogether.
LED display controller 210 provides serial data signal SDI to LED unit plate 220-1, and respectively to LED unit
Plate 220-1 provides one group of control signal to LED unit plate 220-N, including clock signal clk, latch signal LE and first output
Enable signal OE.
Different from the LED display 100 shown in Fig. 1, also include LED protection electricity according to the LED display 200 of this embodiment
Road 230.In this embodiment, LED protection circuit 230 is connected between LED display controller 210 and LED unit plate 220-1,
For enabling signal OE and clock signal clk generation the 3rd output enable signal according to the first outputLED unit plate 220-1
LED drive circuit to LED unit plate 220-N enables signal according to the 3rd outputThere is provided and drive electric current.
Other aspects of LED display 200 according to this embodiment are identical with the LED display shown in Fig. 1, at this no longer
It is described in detail.
In this embodiment, LED protection circuit 230 is arranged on LED display controller 210 and first LED unit plate
Between.In an alternative embodiment, it is internal that LED protection circuit 230 can be arranged on LED display controller 210, thus
Control end and the defencive function of whole LED display is provided.In another alternative embodiment, LED protection circuit 230 can set
Put the inside at LED unit plate, even integrate with LED drive circuit, form one single chip, thus provide single led
The defencive function of module.
Fig. 3 is shown in the LED display shown in Fig. 2 the schematic block diagram of the LED drive circuit used.As it is shown on figure 3,
Each LED unit plate in LED unit plate 220-1 to LED unit plate 220-N can comprise one or more LED drive circuit.
Each LED drive circuit has identical 26S Proteasome Structure and Function.Illustrate as a example by one of them LED drive circuit 221 at this.
LED drive circuit 221 include shift register 2211, latch 2212, phase inverter U11, multiple with door U0 to Un,
Multiple switching tube Q0 to Qn and multiple constant-current source IS0 to ISn.
Shift register 2211 receives clock signal clk and serial data signal SDI, wherein, clock signal clk from
LED display controls end 210, and serial data signal SDI controls end 210 or the LED drive circuit of previous stage from LED display
221.Under the control of clock signal clk, serial data signal SDI is shifted by shift register 2211, and will displacement
After serial data signal SDO provide to the LED drive circuit 221 of next stage.Shift register 2211 stores multi-bit digital value.
Under the control of latch signal LE, the multi-bit digital value of latch 2212 temporary transient latch shift register 2211 storage.
First input end respective with door U0 to Un is respectively connecting to latch 2212, to receive multi-bit digital value, and second
Input is commonly connected to not gate U11.The input of not gate U11 receives the 3rd output and enables signalNot gate U11 with door
U0 to Un forms output together and enables circuit, enables signal in the 3rd outputTime effectively, provide with the outfan of door U0 to Un
Multi-bit digital value.
Control end with the outfan of door U0 to Un is respectively connecting to switching tube Q0 to Qn, is used for controlling switching tube Q0 to Qn
Conducting and disconnection.Switching tube Q0 to Qn is connected in series in outfan respectively with constant-current source IS0 to ISn respectivelyExtremelyWith between ground, thus when switching tube turns at outfanExtremelyThere is provided and each digital value phase respectively
Corresponding driving electric current, thus drive LED luminous.
In this embodiment, the 3rd output enables signalBy with door U0 to Un control output endExtremely
Output level.When the 3rd output enables signalFor time effective, after inverted device is anti-phase " shutoff " outfan with door, LED
Extinguish.When the 3rd output enables signalFor time invalid, after inverted device is anti-phase " open-minded " outfan with door, it is allowed to each LED
Light when D0～Dn is high level.
In this embodiment, describe the LED drive circuit shown in Fig. 3 include shift register, latch, by not gate and
The constant-current source circuit that multiple and door composition output enables circuit, is composed in series by constant-current source and switching tube.But, the present invention is not
It is limited to this.Present invention could apply to any drive circuit including that output enables circuit.
In this embodiment, the 3rd output enables signalWhen low level effectively, invalid when high level, output makes
Phase inverter U11 in energy circuit is for enabling signal by the 3rd outputLow transition become high level, or vice versa.But,
The invention is not restricted to this.If the 3rd output enables signalWhen high level effectively, when low level effectively, then can save
Output is gone to enable the phase inverter U11 in circuit.
Fig. 4 is shown in the LED display shown in Fig. 2 the schematic block diagram of the LED protection circuit used.LED protects electricity
Road 230 is such as connected between LED display controller 210 and first LED unit plate.As shown in Figure 4, LED protection circuit 230
Including filter circuit 231 and NAND gate U21.
The input of filter circuit 231 receives clock signal clk, and outfan provides the second output to enable signal EN.Filtering
The circuit 231 for example, one in RC filter circuit, LC filter circuit, active low-pass filter circuit, clock signal clk is filtered
Produce the second output after wave circuit 231 and enable signal EN.
The first input end of NAND gate U21 and the second input receive the first output respectively and enable signal OE and second output
Enabling signal EN, outfan provides the 3rd output to enable signal
It is effective when high level that the first output that LED display controller 210 provides enables signal OE so that LED lights,
During low level invalid so that LED extinguish.Correspondingly, the 3rd output that LED protection circuit 230 provides enables signalAt low electricity
The most effective so that LED lights, invalid when high level so that LED extinguishes.
When the communication controlled between end and display screen end of LED display screen system is normal, clock is believed by filter circuit 231
The low level of number CLK filters out, and it is high level signal that the second output that filter circuit 231 produces enables signal EN.Now, if
It is high level that one output enables signal OE, and the output signal of described NAND gate that is the 3rd output enables signalFor low level.The
Three outputs enable signalControl LED drive circuit, and effective, such that it is able to light LED when low level.If first is defeated
Going out to enable signal OE is low level, and the output signal of described NAND gate that is the 3rd output enables signalFor high level.3rd is defeated
Go out to enable signalControl LED drive circuit, and invalid when high level, such that it is able to turn off LED.
When the communication abnormality controlled between end and display screen end of LED display screen system, clock signal clk is the most defeated
Entering, it is low level signal that the second output that filter circuit 231 produces enables signal EN.Now, no matter the first output enables signal
OE is high level or low level, and the output signal of described NAND gate that is the 3rd output enables signalFor high level.3rd is defeated
Go out to enable signalControl LED drive circuit, and effective when high level, thus turn off LED all the time.
In this embodiment, the 3rd output enables signalWhen low level effectively, output makes when high level effectively
Phase inverter U11 in energy circuit is for enabling signal by the 3rd outputLow transition become high level, or vice versa.But,
The invention is not restricted to this.If the 3rd output enables signal, invalid when low level, then when high level effectively can save
Output is gone to enable the phase inverter U11 in circuit.
Described LED display controller 210 can, line faulty at LED display disconnected or control end when quitting work, turn off
LED display, saves power consumption, extends LED lifetime of LED.
Fig. 5 illustrates the working waveform figure of LED display according to embodiments of the present invention.Fig. 5 illustrates that the LED in Fig. 2 shows
The working waveform figure of screen 200.
LED display controller 210 provides serial data signal SDI to LED unit plate, and includes clock signal clk, lock
Deposit signal LE and first output and enable the control signal of signal OE.LED protection circuit 230 produces second according to clock signal clk
Output enable signal EN, enables signal EN generation the 3rd output according to the first output enable signal OE and second output further and makes
Can signalLED drive circuit 221 on LED unit plate uses clock signal, latch signal LE and the 3rd output to enable letter
NumberAs control signal, drive multiple LED according to the long numeric data in serial data signal SDI.
As it is shown in figure 5, during LED display controller 210 with the proper communication of LED unit plate, LED drive circuit 221
In shift register under the control of clock signal clk, serial data signal SDI is shifted, and store long numeric data
For driving LED.
It is changed into effective status, the latch in LED drive circuit 221 from disarmed state at moment t0, latch signal LE
Under the control of latch signal LE, the long numeric data that temporary transient latch shift register obtains.
At moment t1, the first output enables signal OE and is changed into effective status from disarmed state.Due in the proper communication phase
Between, LED protection circuit 230 can obtain clock signal clk all the time, enables letter according to the second output that clock signal clk produces
Number EN is always high level, and LED protection circuit 230 enables signal OE and second output according to the first output and enables signal EN and produce
3rd output enables signalNow, the 3rd output enables signalIt it is the inverted version of the first output enable signal OE.?
First output enable signal OE is while disarmed state is changed into effective status, and the 3rd output enables signalAlso from invalid
State is changed into effective status.
Signal is enabled in the second inputControl under, the input of LED drive circuit 221 enables circuit will be according to latch
Long numeric data that device temporarily latches and turn on and disconnect, at outfanExtremelyThere is provided and each digital value phase respectively
Corresponding driving electric current, thus drive LED luminous.
At moment t2, the first output enables signal OE and is changed into disarmed state from effective status, and correspondingly, the second input makes
Can signalAlso it is changed into disarmed state from effective status.LED drive circuit 221 completes the control of a drive cycle, starts
In the display of a next drive cycle.This drive cycle is i.e. from the time period of moment t0 to t2.
In the multiple drive cycle of continuous print, LED drive circuit 221 drives LED luminous according to serial data signal SDI,
Thus complete the display of a two field picture.In multiple frame periods of continuous print, LED drive circuit 221 drives LED luminous, thus
Complete the display of dynamic image.
In this embodiment, it is effective when high level that the first output enables signal OE, and the 3rd output enables signalLow
During level effective.In alternate embodiments, according to the design needs of circuit, the first output enables signal OE can be in low level
Shi Youxiao, the 3rd output enables signalCan be effective when high level.
Different from above-mentioned proper communication, when LED display controller 210 is with the communication abnormality of LED unit plate, LED drives
Shift register and latch in galvanic electricity road 221 still store the multi-bit digital value in a drive cycle.
LED display controller 210 no longer will provide clock signal clk to LED unit plate.LED protection circuit 230 is by filter
The second output that wave circuit produces enables signal EN and is always low level, and LED protection circuit 230 enables signal according to the first output
OE and second output enables signal EN and produces the 3rd output enable signalNow, the 3rd output enables signalAll the time tie up
Hold as high level.
Therefore, no matter the multi-bit digital value of LED drive circuit 221 storage, the lock of mistake is the most whether received
Depositing signal LE and first output and enable signal OE, LED drive circuit 221 disconnects the switching tube in constant-current source all the time, thus forbids
Drive circuit is provided, so that LED extinguishes to input.
In the above-described embodiment, describe LED protection circuit to be made by detection clock signal clk, generation the second output
Energy signal EN, enables signal OE and second output enable signal EN generation the 3rd output according to the first output further and enables signalLED drive circuit enables signal according to the 3rd outputEnable or disable outfan.Therefore, LED display controller with
When communication between LED unit plate disconnects, enable signal due to the first output and the second output enable signal and is disarmed state,
Therefore the outfan of LED drive circuit can be disabled, until communication recovery is normal.
The automatically shutting down when present invention uses LED protection circuit to realize LED display no signal, thus ensure that LED shows
Display screen occurs without error image.Circuit of the present invention is simple, practical and reliable, has both extended the service life of light emitting diode, simultaneously
Also reduce the energy consumption of system.
According to embodiments of the invention as described above, these embodiments do not have all of details of detailed descriptionthe, the most not
Limit the specific embodiment that this invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is to preferably explain the principle of the present invention and actual application, so that affiliated
Technical field technical staff can utilize the present invention and amendment on the basis of the present invention to use well.The protection model of the present invention
Enclose and should be defined in the range of standard with the claims in the present invention.
Claims (17)
1., for a control method for LED display, described LED display includes the multiple LED as pixel, described method
Including:
Serial data signal, clock signal and the first output is provided to enable signal；
Described clock signal is filtered produces the second output and enables signal；
Enable signal according to the first output and the second output enables signal generation the 3rd output and enables signal；And
Driving electric current is provided to the plurality of LED according to described serial data signal,
Wherein, described 3rd output enable signal is used for enabling or disabling provides driving electric current to described LED.
Method the most according to claim 1, wherein, enables signal and described second output enable letter in described first output
Time number all effectively, it is effective that described 3rd output enables signal, and enables signal and described second output in described first output
Enable signal any one invalid time, described 3rd output enable invalidating signal.
Method the most according to claim 2, wherein, described first output enables signal and described second output enables circuit
When high level effectively, described 3rd enable signal is effective when low level.
4. a LED display, including:
LED display controller, is used for providing serial data signal, clock signal and the first output to enable signal；
LED protection circuit, is connected with described LED display controller, enables according to described clock signal and described first output
Signal produces described 3rd output and enables signal；And
Multiple LED drive circuits, are connected with described LED display controller and described LED protection circuit, according to described serial number
The number of it is believed that provides and drives electric current,
Multiple LED, are connected with the plurality of LED drive circuit, and light under the effect driving electric current, thus as institute
State the pixel of LED display.
LED display the most according to claim 4, wherein, the plurality of LED drive circuit drives the plurality of respectively
Corresponding set of LED in LED.
LED display the most according to claim 5, wherein, the plurality of LED drive circuit cascades with one another connection, and
It is arranged on multiple LED unit plate.
LED display the most according to claim 6, wherein, the plurality of LED drive circuit includes that neighbouring described LED shows
Showing the first LED drive circuit of controller, described LED drive circuit is positioned at described LED display controller and a described LED drives
Between galvanic electricity road, thus public described 3rd output is provided to enable signal to the plurality of LED drive circuit.
LED display the most according to claim 6, wherein, described LED protection circuit includes multiple protection module, described
Multiple protection modules are connected with the plurality of LED drive circuit respectively, thus provide respectively to the plurality of LED drive circuit
Respective described 3rd output enables signal.
LED display the most according to claim 6, wherein, the plurality of LED drive circuit respectively with a corresponding guarantor
Protect module to be integrated in same chip.
LED display the most according to claim 4, wherein, the plurality of LED drive circuit includes respectively:
Constant-current source circuit, for according to serial data signal, provides to the outfan of LED drive circuit and drives electric current；And
Output enables circuit, for enabling signal according to described 3rd output, enables or disables described constant-current source circuit.
11. LED displays according to claim 10, wherein, described constant-current circuit includes:
Constant-current source, for producing the electric current of constant as driving electric current；And
Switching tube, is connected in series with described constant-current source, and when described switching tube turns on, the outfan at LED drive circuit provides
Described driving electric current.
12. LED displays according to claim 11, wherein, described output enables circuit and includes:
Not gate, is used for receiving described 3rd output and enables signal, and produce the inversion signal of described 3rd output enable signal；
And
With door, enable the inversion signal of signal and described serial data signal for receiving described 3rd output, and to institute
State switching tube and provide switch controlling signal, to control the conducting state of described switching tube.
13. LED displays according to claim 12, wherein, described LED drive circuit also includes:
Shift register, for shifting described serial data signal and storing multi-bit digital value；And
Latch, is used for temporarily depositing and enabling circuit to described output providing described multi-bit digital value,
Wherein, described LED display controller provides described clock signal and described serial data signal to described shift register,
Described LED display controller provides latch signal to described latch.
14. 1 kinds of protection circuits for LED display, including:
Filter circuit, is used for receiving clock signal, and is filtered clock signal producing the second output enable signal；
Logic circuit, is connected with described filter circuit, is used for receiving described second output and enables signal, and it is defeated to receive first
Go out and enable signal, and enable signal generation the 3rd output enable signal according to the first output enable signal and the second output,
Wherein, described 3rd output enables signal and drives electric current for enabling or disabling to provide to the LED of described LED display.
15. protection circuits according to claim 14, wherein, described filter circuit includes selected from RC filter circuit, LC filter
One in wave circuit, active low-pass filter circuit.
16. protection circuits according to claim 14, wherein, the work of described logic circuit makes to export described first
Enable signal and described second output enable signal all effectively time, it is effective that described 3rd output enables signal, and described the
One output enable signal and described second output enable signal any one invalid time, described 3rd output enable invalidating signal.
17. protection circuits according to claim 16, wherein, described logic circuit is NAND gate, and described first output makes
It is effective when high level that energy signal and described second output enable circuit, and described 3rd enable signal is effective when low level.
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