CN106297652B - LED display and its control method - Google Patents
LED display and its control method Download PDFInfo
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- CN106297652B CN106297652B CN201610877564.2A CN201610877564A CN106297652B CN 106297652 B CN106297652 B CN 106297652B CN 201610877564 A CN201610877564 A CN 201610877564A CN 106297652 B CN106297652 B CN 106297652B
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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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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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Abstract
This application discloses LED display and its control methods.The protection circuit includes: filter circuit, is filtered for receiving clock signal, and to clock signal with generation the second output enable signal；Logic circuit, it is connected with the filter circuit, for receiving the second output enable signal, and receive the first output enable signal, and it generates third according to the first output enable signal and the second output enable signal and exports enable signal, wherein, the third output enable signal provides driving current for enabling or disabling to the LED of the LED display.The protection circuit disables LED display in communication abnormality, and LED screen power consumption is shown and reduced so as to improve image and extends the LED screen service life.
Description
Technical field
The present invention relates to LED display techniques, more particularly, to LED display and its control method.
Background technique
It is LED in the pixel element that LED display uses.Superiority of the LED display with following aspect: high gray scale,
Wide visible angle, color abundant and customized screen shape.Therefore, LED display is widely used in industry, hands over
The every field such as logical, commercial advertisement, information publication, sports tournament.In LED display, using electric current control method and it can lead
Logical time control act realizes multi-stage grey scale.In electric current control method, it is controlled by adjusting the size of current flowed through in LED
Gray scale.In turn-on time control methods, constant current driving is maintained, controls the gray scale of LED by changing duty ratio.
In actual products, widely using the turn-on time control methods that timesharing is shown by turn, according to gradation data
To show multi-stage grey scale.For this purpose, control terminal is communicated with display screen end in LED display screen system, latter provides data
Signal and control signal.The control signal is for example including clock signal, enable signal and latch signal.The drive at LED display end
Dynamic circuit receives data-signal, and is latched under control of the control signal.The driving circuit at LED display end is according to number
It is believed that number corresponding LED being lighted/extinguishing, to realize the display of image information.
However, LED display is frequently present of the situation of communication abnormality interruption, for example, because the reasons such as failure or power failure are made
When stopping working at control terminal or control terminal and the signal wire at display screen end fall off.At this point, the latch data at LED display end
It does not reset, due to saving the data before communication disruption, LED display will appear the display content or full frame random of mistake
Flashing or image are chaotic.The communication abnormality interruption of display screen does not only result in image and shows mistake, and when may cause LED long
Between light, cause the power consumption of LED screen to increase to reduce the service life reduction of LED.
Summary of the invention
In view of the above problems, the purpose of the present invention is to provide a kind of LED display and its control methods, wherein using protecting
Protection circuit disables LED display in communication abnormality, and LED screen power consumption is shown and reduced so as to improve image and extends LED screen
Service life.
According to the first aspect of the invention, a kind of control method for LED display, the LED display packet are provided
Include multiple LED as pixel, which comprises provide serial data signal, clock signal and the first output enable signal；
The clock signal is filtered to generate the second output enable signal；Made according to the first output enable signal and the second output
It can signal generation third output enable signal；And driving current is provided to the multiple LED according to the serial data signal,
Wherein, the third output enable signal provides driving current for enabling or disabling to the LED.
Preferably, in the first output enable signal and effective the second output enable signal, the third
It is effective to export enable signal, and any one is invalid in the first output enable signal and the second output enable signal
When, the third output enable signal is invalid.
Preferably, the first output enable signal and the enabled circuit of the second output are effective in high level, described
Third enable signal is effective in low level.
According to the second aspect of the invention, a kind of LED display is provided, comprising: LED display controller, for providing string
Row data-signal, clock signal and the first output enable signal；LED protection circuit is connected with the LED display controller,
It generates the third according to the clock signal and the first output enable signal and exports enable signal；And multiple LED drive
Dynamic circuit, is connected with the LED display controller and the LED protection circuit, provides drive according to the serial data signal
Streaming current, multiple LED are connected with the multiple LED drive circuit, and light under the action of driving current, to make
For the pixel of the LED display.
Preferably, the multiple LED drive circuit respectively drives the corresponding set of LED in the multiple LED.
Preferably, the multiple LED drive circuit cascades with one another connection, and is mounted on multiple LED unit plates.
Preferably, the multiple LED drive circuit includes the first LED drive circuit of the neighbouring LED display controller,
The LED drive circuit is between the LED display controller and first LED drive circuit, thus to the multiple
LED drive circuit provides public third output enable signal.
Preferably, the LED protection circuit includes multiple protective modules, the multiple protective module respectively with it is the multiple
LED drive circuit is connected, to provide the respective enabled letter of third output respectively to the multiple LED drive circuit
Number.
Preferably, the multiple LED drive circuit is integrated in the same chip with a corresponding protective module respectively.
Preferably, the multiple LED drive circuit respectively include: constant-current source circuit, for according to serial data signal, to
The output end of LED drive circuit provides driving current；And enabled circuit is exported, for exporting enabled letter according to the third
Number, enable or disable the constant-current source circuit.
Preferably, the constant-current source circuit includes: constant-current source, for generating the electric current of constant as driving current；
And switching tube, it is connected in series with the constant-current source, in switching tube conducting, is provided in the output end of LED drive circuit
The driving current.
Preferably, the enabled circuit of the output includes: NOT gate, for receiving the third output enable signal, and is produced
The inversion signal of the raw third output enable signal；And with door, for receiving the reverse phase of third output enable signal
Signal and the serial data signal, and switch control signal is provided to the switching tube, to control the switching tube
On state.
Preferably, the LED drive circuit further include: shift register, for being moved to the serial data signal
Position and storage multi-bit digital value；And latch, for temporarily depositing and being provided to the enabled circuit of the output described more
Bit digital value, wherein the LED display controller provides the clock signal and the serial data to the shift register
Signal, the LED display controller provide latch signal to the latch.
According to the third aspect of the invention we, a kind of protection circuit for LED display is provided, comprising: filter circuit is used
In reception clock signal, and clock signal is filtered to generate the second output enable signal；Logic circuit, with the filter
Wave circuit is connected, and for receiving the second output enable signal, and receives the first output enable signal, and according to the
One output enable signal and the second output enable signal generate third and export enable signal, wherein the enabled letter of third output
Number for enable or disable to the LED of the LED display provide driving current.
Preferably, the filter circuit includes in RC filter circuit, LC filter circuit, active low-pass filter circuit
It is a kind of.
Preferably, the work of the logic circuit is so that enabled in the first output enable signal and second output
When signal is effective, third output enable signal is effective, and in the first output enable signal and described second defeated
Out enable signal any one it is invalid when, third output enable signal is invalid.
Preferably, the logic circuit is NAND gate, the first output enable signal and the enabled electricity of the second output
Road is effective in high level, and the third enable signal is effective in low level.
LED protection circuit according to an embodiment of the present invention generates the second output enable signal by detection clock signal, into
One step generates third and exports enable signal according to the first output enable signal and the second output enable signal.LED drive circuit root
Output end is enabled or disabled according to third output enable signal.Therefore, the communication between LED display controller and LED unit plate
When disconnection, since the first output enable signal and the second output enable signal are invalid state, LED driving can be disabled
The output end of circuit, until communication recovery is normal.
Further, LED display according to an embodiment of the present invention and control method realize LED using LED protection circuit
Automatically shutting down when display screen no signal, to ensure that error image does not occur in LED display.Circuit of the present invention is simple, real
With, it is reliable, both extended the service life of light emitting diode, while also reducing the energy consumption of system.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from.
Fig. 1 is the schematic block diagram according to the LED display of the prior art；
Fig. 2 is the schematic block diagram according to the LED display of the embodiment of the present invention；
Fig. 3 shows the schematic block diagram of the LED drive circuit used in LED display shown in Fig. 2；
Fig. 4 shows the schematic block diagram of the LED protection circuit used in LED display shown in Fig. 2；
Fig. 5 shows the working waveform figure of LED display according to an embodiment of the present invention.
Specific embodiment
The various embodiments that the present invention will be described in more detail that hereinafter reference will be made to the drawings.In various figures, identical element
It is indicated using same or similar appended drawing reference.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 1 is the schematic block diagram according to the LED display of the prior art.LED display screen system 100 includes that LED is shown
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 A LED drive circuit, and each LED drive circuit is used to drive B LED, wherein A
It is greater than the integer equal to 1 respectively with B.Therefore, which can drive N*A*B LED in total.
LED display controller provides serial data signal SDI to LED unit plate 120-1, and respectively to LED unit plate
120-1 to LED unit plate 120-N provides one group of control signal, including clock signal clk, the output of latch signal LE and first make
It 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 latch, serial data signal SDI is exported into the driving electricity of next LED to the cell board
Road.Each LED drive circuit generates output signal according to the serial data signal SDI of latch.LED unit plate 120-1 to LED
LED drive circuit in cell board 120-N provides driving current according to the first output enable signal OE.LED is according to timesharing by turn
The mode of display is lighted or is extinguished, to realize the display of image information.
For example, in order to show a frame image, providing 16 ashes for each LED pixel in turn-on time control methods
Degree is according to D [0:15].Each of gradation data D [0:15] corresponds to effective display time of different weights, and weight uses
2nT indicates that wherein n indicates data bit.A bit data is extracted by turn from 16 gradation datas, is divided into 16 times and is lighted/extinguish
Corresponding LED.The LED's lights gray level of the effective time cumulative gradation effect as the pixel.
Fig. 2 is the schematic block diagram according to the LED display of 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 A LED drive circuit, and each LED drive circuit is used to drive B LED, wherein A
It is greater than the integer equal to 1 respectively with B.Therefore, which can drive N*A*B LED in total.
LED display controller 210 provides serial data signal SDI to LED unit plate 220-1, and respectively to LED unit
Plate 220-1 to LED unit plate 220-N provides one group of control signal, including clock signal clk, the output of latch signal LE and first
Enable signal OE.
Different from LED display 100 shown in FIG. 1, LED display 200 further includes LED protection electricity according to this embodiment
Road 230.In this embodiment, LED protection circuit 230 is connected between LED display controller 210 and LED unit plate 220-1,
Enable signal is exported for generating third according to the first output enable signal OE and clock signal clkLED unit plate 220-
1 LED drive circuit into LED unit plate 220-N exports enable signal according to thirdDriving current is provided.
Other aspects of LED display 200 are identical as LED display shown in FIG. 1 according to this embodiment, herein no longer
It is described in detail.
In this embodiment, LED protection circuit 230 is arranged in LED display controller 210 and first LED unit plate
Between.In an alternative embodiment, LED protection circuit 230 be can be set inside LED display controller 210, thus
Control terminal provides the defencive function of entire LED display.In another alternative embodiment, LED protection circuit 230 can be set
It sets in the inside of LED unit plate, or even is integrated with LED drive circuit, one single chip is formed, to provide single led
The defencive function of mould group.
Fig. 3 shows the schematic block diagram of the LED drive circuit used in LED display shown in Fig. 2.As shown in figure 3,
Each LED unit plate of the LED unit plate 220-1 into LED unit plate 220-N may include one or more LED drive circuits.
Each LED drive circuit structure and function having the same.It is illustrated by taking one of LED drive circuit 221 as an example herein.
LED drive circuit 221 include shift register 2211, latch 2212, phase inverter U11, it is multiple with door U0 to Un,
Multiple switch pipe 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 comes from
LED display control end 210, LED drive circuit of the serial data signal SDI from LED display control end 210 or previous stage
221.Under the control of clock signal clk, shift register 2211 shifts serial data signal SDI, and will displacement
Serial data signal SDO afterwards is provided 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 the temporary latch shift register 2211 of latch 2212 storage.
It is respectively connected to latch 2212 with the respective first input end of door U0 to Un, to receive multi-bit digital value, second
Input terminal is commonly connected to NOT gate U11.The input terminal of NOT gate U11 receives third and exports enable signalNOT gate U11 with door
U0 to Un forms the enabled circuit of output together, exports enable signal in thirdWhen effective, provided with the output end of door U0 to Un
Multi-bit digital value.
It is respectively connected to the control terminal of switching tube Q0 to Qn with the output end of door U0 to Un, is used for control switch pipe Q0 to Qn
Conducting and disconnection.Switching tube Q0 to Qn is connected in series in output end with constant-current source IS0 to ISn respectively respectivelyExtremelyBetween ground, thus in switching tube conducting in output endExtremelyIt provides and each digital value phase respectively
Corresponding driving current, so that LED be driven to shine.
In this embodiment, third exports enable signalBy with door U0 to the control output end UnExtremely
Output level.When third exports enable signalWhen being effective, after inverted device reverse phase " shutdown " output end with door, LED
Extinguish.When third exports enable signalWhen being invalid, after inverted device reverse phase " open-minded " output end with door, allow each LED
It is lighted when D0~Dn is high level.
In this embodiment, describe LED drive circuit shown in Fig. 3 include shift register, latch, by NOT gate and
The constant-current source circuit that multiple outputs with door composition enable circuit, are composed in series by constant-current source and switching tube.However, the present invention is not
It is limited to this.Present invention could apply to any driving circuits that circuit is enabled including exporting.
In this embodiment, third exports enable signalEffective in low level, invalid in high level, output makes
Phase inverter U11 in energy circuit is used to third exporting enable signalLow transition at high level, or vice versa.However,
The invention is not limited thereto.If third exports enable signalIt is effective in high level, it is effective in low level, then it can save
Remove to export the phase inverter U11 in enabled circuit.
Fig. 4 shows the schematic block diagram of the LED protection circuit used in LED display shown in Fig. 2.LED protection electricity
Road 230 is for example 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 terminal of filter circuit 231 receives clock signal clk, and output end provides the second output enable signal EN.Filtering
Circuit 231 is, for example, to be selected from one of RC filter circuit, LC filter circuit, active low-pass filter circuit, clock signal clk filter
The second output enable signal EN is generated after wave circuit 231.
The first input end of NAND gate U21 and the second input terminal receive the output of the first output enable signal OE and second respectively
Enable signal EN, output end provide third and export enable signal
The first output enable signal OE that LED display controller 210 provides is effective in high level, so that LED is lighted,
It is invalid when low level, so that LED extinguishes.Correspondingly, the third that LED protection circuit 230 provides exports enable signalIn low electricity
Usually effectively, invalid in high level so that LED is lighted, so that LED extinguishes.
When communication between the control terminal and display screen end of LED display screen system is normal, filter circuit 231 believes clock
The low level of number CLK filters out, and the second output enable signal EN that filter circuit 231 generates is high level signal.At this point, if
One output enable signal OE is high level, and output signal, that is, third of the NAND gate exports enable signalFor low level.The
Three output enable signalsLED drive circuit is controlled, and effective in low level, so as to light LED.If first is defeated
Enable signal OE is low level out, and output signal, that is, third of the NAND gate exports enable signalFor high level.Third is defeated
Enable signal outLED drive circuit is controlled, and invalid in high level, so as to turn off LED.
When communication abnormality between the control terminal and display screen end of LED display screen system, clock signal clk is not defeated
Enter, the second output enable signal EN that filter circuit 231 generates is low level signal.At this point, no matter first output enable signal
OE is high level or low level, and output signal, that is, third of the NAND gate exports enable signalFor high level.Third is defeated
Enable signal outLED drive circuit is controlled, and effective in high level, to turn off LED always.
In this embodiment, third exports enable signalEffective in low level, effective in high level, output makes
Phase inverter U11 in energy circuit is used to third exporting enable signalLow transition at high level, or vice versa.However,
The invention is not limited thereto.If third exports enable signalIt is effective in high level, it is invalid in low level, then it can save
Remove to export the phase inverter U11 in enabled circuit.
The LED display controller 210 can, line faulty in LED display it is disconnected or when control terminal stops working, shutdown
LED display saves power consumption, extends LED lifetime of LED.
Fig. 5 shows the working waveform figure of LED display according to an embodiment of the present invention.Fig. 5 shows the LED in Fig. 2 and shows
The working waveform figure of screen 200.
LED display controller 210 provides serial data signal SDI to LED unit plate, and including clock signal clk, lock
Deposit the control signal of the output of signal LE and first enable signal OE.LED protection circuit 230 generates second according to clock signal clk
Enable signal EN is exported, further generating third output according to the first output enable signal OE and the second output enable signal EN makes
It can signalLED drive circuit 221 on LED unit plate is using clock signal, latch signal LE and the enabled letter of third output
NumberAs control signal, multiple LED are driven according to the long numeric data in serial data signal SDI.
As shown in figure 5, during the normal communication of LED display controller 210 and LED unit plate, LED drive circuit 221
In shift register serial data signal SDI is shifted under the control of clock signal clk, and store long numeric data
For driving LED.
In moment t0, latch signal LE is changed into effective status from invalid state, the latch in LED drive circuit 221
Under the control of latch signal LE, the long numeric data of temporary latch shift register acquisition.
It is changed into effective status from invalid state in moment t1, the first output enable signal OE.Due in the normal communication phase
Between, LED protection circuit 230 can obtain clock signal clk always, the enabled letter of the second output generated according to clock signal clk
Number EN is always high level, and LED protection circuit 230 is generated according to the first output enable signal OE and the second output enable signal EN
Third exports enable signalAt this point, third exports enable signalIt is the inverted version of the first output enable signal OE.?
While first output enable signal OE is changed into effective status from invalid state, third exports enable signalAlso from invalid
State is changed into effective status.
Enable signal is inputted secondControl under, the input of LED drive circuit 221 enables circuit will be according to latch
Long numeric data that device temporarily latches and be connected and disconnect, in output endExtremelyIt provides and each digital value phase respectively
Corresponding driving current, so that LED be driven to shine.
It is changed into invalid state from effective status in moment t2, the first output enable signal OE, correspondingly, the second input makes
It can signalAlso it is changed into invalid state from effective status.LED drive circuit 221 completes the control of a drive cycle, starts
In a next drive cycle display.The drive cycle is the period from moment t0 to t2.
In continuous multiple drive cycles, LED drive circuit 221 drives LED to shine according to serial data signal SDI,
To complete the display of a frame image.In continuous multiple frame periods, LED drive circuit 221 drives LED to shine, thus
Complete the display of dynamic image.
In this embodiment, the first output enable signal OE is effective in high level, and third exports enable signalLow
It is effective when level.In alternate embodiments, according to the design needs of circuit, the first output enable signal OE can be in low level
Shi Youxiao, third export enable signalIt can be effective in high level.
Different from above-mentioned normal communication, in the communication abnormality of LED display controller 210 and LED unit plate, LED is driven
Shift register and latch in dynamic circuit 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 passes through filter
The second output enable signal EN that wave circuit generates is always low level, and LED protection circuit 230 is according to the first output enable signal
The output of OE and second enable signal EN generates third and exports enable signalAt this point, third exports enable signalAlways it ties up
It holds as high level.
Therefore, no matter the multi-bit digital value that LED drive circuit 221 stores, the lock of mistake is also whether received
The output enable signal OE of signal LE and first is deposited, LED drive circuit 221 disconnects the switching tube in constant-current source always, to forbid
Driving circuit is provided to input terminal, so that LED extinguishes.
In the above-described embodiment, LED protection circuit is described by detection clock signal clk, and generating the second output makes
Energy signal EN further generates third and exports enable signal according to the first output enable signal OE and the second output enable signal ENLED drive circuit exports enable signal according to thirdEnable or disable output end.Therefore, LED display controller with
When communication between LED unit plate disconnects, since the first output enable signal and the second output enable signal are invalid state,
Therefore the output end of LED drive circuit can be disabled, until communication recovery is normal.
The present invention realizes automatically shutting down when LED display no signal using LED protection circuit, to ensure that LED is aobvious
There is not error image in display screen.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.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.Protection model of the invention
The range that the claims in the present invention are defined should be subject to by enclosing.
Claims (13)
1. a kind of control method for LED display, the LED display includes multiple LED as pixel, the method
Include:
Serial data signal, clock signal and the first output enable signal are provided；
The clock signal is filtered to generate the second output enable signal；
It generates third according to the first output enable signal and the second output enable signal and exports enable signal；And
Driving current is provided to the multiple LED according to the serial data signal,
Wherein, the third output enable signal and the digital value of the serial data signal are provided commonly for enabling or disabling to institute
It states LED and driving current is provided.
2. according to the method described in claim 1, wherein, enabling letter in the first output enable signal and second output
When number effective, the third output enable signal is effective, and in the first output enable signal and second output
Enable signal any one it is invalid when, third output enable signal is invalid.
3. according to the method described in claim 2, wherein, the first output enable signal and described second exports enabled circuit
Effective in high level, the third output enable signal is effective in low level.
4. a kind of LED display, comprising:
LED display controller, for providing serial data signal, clock signal and the first output enable signal；
LED protection circuit is connected with the LED display controller, enabled according to the clock signal and first output
Signal generates third and exports enable signal；And
Multiple LED drive circuits are connected, according to the serial number with the LED display controller and the LED protection circuit
It is believed that number offer driving current,
Multiple LED are connected with the multiple LED drive circuit, and light under the action of driving current, thus as institute
The pixel of LED display is stated,
Wherein, the third output enable signal and the digital value of the serial data signal are provided commonly for enabling or disabling to institute
It states LED and driving current is provided.
5. LED display according to claim 4, wherein the multiple LED drive circuit respectively drives the multiple
Corresponding set of LED in LED.
6. LED display according to claim 5, wherein the multiple LED drive circuit cascades with one another connection, and
It is mounted on multiple LED unit plates.
7. LED display according to claim 6, wherein the multiple LED drive circuit includes the neighbouring LED aobvious
Show the first LED drive circuit of controller, the LED protection circuit is located at the LED display controller and the first LED drives
Between dynamic circuit, so that providing the public third to the multiple LED drive circuit exports enable signal.
8. LED display according to claim 6, wherein the LED protection circuit includes multiple protective modules, described
Multiple protective modules are connected with the multiple LED drive circuit respectively, to provide respectively to the multiple LED drive circuit
The respective third exports enable signal.
9. LED display according to claim 6, wherein the multiple LED drive circuit is protected with corresponding one respectively
Shield module is integrated in the same chip.
10. LED display according to claim 4, wherein the multiple LED drive circuit respectively include:
Constant-current source circuit, for providing driving current to the output end of LED drive circuit according to serial data signal；And
Enabled circuit is exported, for exporting the digital value of enable signal and the serial data signal according to the third, is enabled
Or the disabling constant-current source circuit.
11. LED display according to claim 10, wherein the constant-current source circuit includes:
Constant-current source, for generating the electric current of constant as driving current；And
Switching tube is connected in series with the constant-current source, in switching tube conducting, provides in the output end of LED drive circuit
The driving current.
12. LED display according to claim 11, wherein the output enables circuit and includes:
NOT gate for receiving the third output enable signal, and generates the inversion signal of the third output enable signal；
And
With door, the inversion signal of enable signal and the digital value of the serial data signal are exported for receiving the third,
And switch control signal is provided to the switching tube, to control the on state of the switching tube.
13. LED display according to claim 12, wherein the LED drive circuit further include:
Shift register, for the serial data signal being shifted and being stored multi-bit digital value；And
Latch, for temporarily depositing and providing the multi-bit digital value to the enabled circuit of the output,
Wherein, the LED display controller provides the clock signal and the serial data signal to the shift register,
The LED display controller provides latch signal to the latch.
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| CN201610877564.2A CN106297652B (en) | 2016-10-08 | 2016-10-08 | LED display and its control method |
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| CN201610877564.2A CN106297652B (en) | 2016-10-08 | 2016-10-08 | LED display and its control method |
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|---|---|---|---|---|
| CN107346652B (en) * | 2017-08-07 | 2023-07-21 | 杭州视芯科技股份有限公司 | LED display device and driving method thereof |
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