CN206379156U - LED display and its protection circuit - Google Patents
LED display and its protection circuit Download PDFInfo
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- CN206379156U CN206379156U CN201621103337.6U CN201621103337U CN206379156U CN 206379156 U CN206379156 U CN 206379156U CN 201621103337 U CN201621103337 U CN 201621103337U CN 206379156 U CN206379156 U CN 206379156U
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Abstract
This application discloses LED display and its protection circuit.The protection circuit includes：Filter circuit, for receiving clock signal, and is filtered to produce the second output enable signal to clock signal；Logic circuit, it is connected with the filter circuit, signal is enabled for receiving second output, and receive the first output and enable signal, and the output enable signal of signal generation the 3rd is enabled according to the first output enable signal and the second output, wherein, the 3rd output enables signal and is used to enable or disable the LED offer driving currents to the LED display.The protection circuit disables LED display in communication abnormality, so that improving image shows and reduce LED screen power consumption and extension LED screen life-span.
Description
Technical field
The utility model is related to LED display technique, more particularly, to LED display and its protection circuit.
Background technology
The pixel element used in LED display is LED.LED display has the superiority of following aspect：High gray scale,
Wide visible angle, abundant color and customizable screen shape.Therefore, LED display is widely used in industry, handed over
The every field such as logical, commercial advertisement, information issue, 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, the size of current that is flowed through by adjusting in LED controls it
Gray scale.In ON time control methods, constant current driving is maintained, LED gray scale is controlled by changing dutycycle.
In actual product, widely using the ON time control methods that timesharing is shown by turn, according to gradation data
To show multi-stage grey scale.Therefore, in LED display screen system, control end is communicated with display screen end, 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 drive 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, the reason such as barrier or power failure is made for some reason
When being stopped into control end, or control end and the signal wire at display screen end come off.Now, the latch data at LED display end
Do not reset, due to saving the data before communication disruption, the display content or full frame random of mistake occurs in LED display
Flicker or image are chaotic.The communication abnormality of display screen, which is interrupted, does not only result in image display mistake, and when LED may be caused long
Between light, causing the power consumption of LED screen increases to reduce LED service life reduction.
Utility model content
In view of the above problems, the purpose of this utility model is to provide a kind of LED display and its protection circuit, wherein adopting
LED display is disabled in communication abnormality with protection circuit, so that improving image shows and reduce LED screen power consumption and extension
The LED screen life-span.
According to first aspect of the present utility model there is provided a kind of LED display, including：LED display controllers, for carrying
Signal is enabled for serial data signal, clock signal and the first output；LED protection circuit, is connected with the LED display controllers
Connect, enabling signal according to the clock signal and first output produces the 3rd output enable signal；And multiple LED drivings
Circuit, is connected with the LED display controllers and the LED protection circuit, and driving is provided according to the serial data signal
Electric current, multiple LED are connected with the multiple LED drive circuit, and are lighted in the presence of driving current, so that conduct
The pixel of the LED display.
Preferably, the multiple LED drive circuit drives the corresponding set of LED in the multiple LED respectively.
Preferably, the multiple LED drive circuit cascades with one another connection, and on multiple LED unit plates.
Preferably, the multiple LED drive circuit includes the first LED drive circuit of the neighbouring LED display controllers,
The LED drive circuit is located between the LED display controllers and first LED drive circuit, so as to the multiple
LED drive circuit provides public the 3rd output and enables signal.
Preferably, the LED protection circuit include multiple protection modules, the multiple protection module respectively with it is the multiple
LED drive circuit is connected, so that providing respective 3rd output respectively to the multiple LED drive circuit enables letter
Number.
Preferably, the multiple LED drive circuit is integrated in same chip with a corresponding protection module respectively.
Preferably, the multiple LED drive circuit includes respectively：Constant-current source circuit, for according to serial data signal, to
The output end of LED drive circuit provides driving current；And output enables circuit, for enabling letter according to the described 3rd output
Number, enable or disable the constant-current source circuit.
Preferably, the constant-current circuit includes：Constant-current source, for producing the electric current of constant as driving current；With
And switching tube, it is connected in series with the constant-current source, when the switching tube is turned on, institute is provided in the output end of LED drive circuit
State driving current.
Preferably, the output enables circuit and included：NOT gate, enables signal, and produce for receiving the 3rd output
Raw 3rd output enables the inversion signal of signal；And with door, for receive it is described 3rd output enable signal it is anti-phase
Signal and the serial data signal, and switch controlling signal is provided to the switching tube, to control the switching tube
Conducting state.
Preferably, the LED drive circuit also includes：Shift register, for being moved to the serial data signal
Position and storage multi-bit digital value；And latch, provide described many for temporarily depositing and enabling circuit to the output
Bit digital value, wherein, the LED display controllers provide the clock signal and the serial data to the shift register
Signal, the LED display controllers provide latch signal to the latch.
According to second aspect of the present utility model there is provided a kind of protection circuit for LED display, including：Filtered electrical
Road, for receiving clock signal, and is filtered to produce the second output enable signal to clock signal；Logic circuit, with
The filter circuit is connected, and signal is enabled for receiving second output, and receives the first output enable signal, and
Signal is enabled according to the first output and the second output enables the output of signal generation the 3rd and enables signal, wherein, the 3rd output
Enabling signal is used to enable or disable the LED offer driving currents to the LED display.
Preferably, the filter circuit is included in RC filter circuits, LC filter circuits, active low-pass filter circuit
It is a kind of.
Preferably, the work of the logic circuit to enable signal in the described first output and second output is enabled
When signal is effective, the 3rd output enables signal effectively, and enables signal and described second defeated in the described first output
Go out to enable signal any one it is invalid when, it is described 3rd output enable invalidating signal.
Preferably, the logic circuit is NAND gate, and first output enables signal and second output enables electricity
In high level effectively, it is effective in low level that the 3rd output enables signal on road.
According to the LED protection circuit of the utility model embodiment by detecting clock signal, produce the second output and enable letter
Number, signal is further enabled according to the first output and the second output enables the output of signal generation the 3rd and enables signal.LED driving electricity
Road enables signal according to the 3rd output and enables or disables output end.Therefore, between LED display controllers and LED unit plate
When communication disconnects, due to the first output enable signal and the second output to enable signal be disarmed state, therefore LED can be disabled
The output end of drive circuit, until communication recovery is normal.
Further, according to the LED display of the utility model embodiment, LED display is realized using LED protection circuit
Automatically shutting down during no signal, so as to ensure that LED display occurs without error image.The utility model circuit is simple, practical,
Reliably, the service life of light emitting diode had both been extended, while also reducing the energy consumption of system.
Brief description of the drawings
By description referring to the drawings to the utility model embodiment, of the present utility model above-mentioned and other mesh
, 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 utility model embodiment；
Fig. 3 shows the schematic block diagram of the LED drive circuit used in the LED display shown in Fig. 2；
Fig. 4 shows the schematic block diagram of the LED protection circuit used in the LED display shown in Fig. 2；
Fig. 5 shows the working waveform figure of the LED display according to the utility model embodiment.
Embodiment
Various embodiments of the present utility model are more fully described hereinafter with reference to accompanying drawing.In various figures, identical
Element is represented using same or similar reference.For the sake of clarity, the various pieces in accompanying drawing are not drawn to paint
System.
The utility model can be presented in a variety of manners, some of examples explained below.
Fig. 1 is the schematic block diagram of the LED display according to prior art.LED display screen system 100 is shown including LED
The LED unit plate 120-1 to 120-N of controller 110 and N number of concatenation, wherein N are 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, the LED display can drive N*A*B LED altogether.
LED display controllers provide 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 outputs of latch signal LE and first make
Can signal OE.The first LED drive circuit on first LED unit plate 120-1 receives serial data signal from LED display controllers
SDI, and after displacement and latch, serial data signal SDI is exported into next LED to the cell board and drives electricity
Road.Each LED drive circuit produces 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 enables signal OE according to the first output and provides driving current.LED is according to timesharing by turn
The mode of display is lighted or extinguished, to realize the display of image information.
For example, in ON time control methods, in order to show a two field picture, 16 ashes are provided for each LED pixel
Degrees of data D [0:15].Gradation data D [0:15] each corresponds to effective display time of different weights, and its weight is used
2nT represents that wherein n represents data bit.Extract a bit data by turn from 16 gradation datas, be divided into 16 times and light/extinguish
Corresponding LED.The LED's lights effective time cumulative gradation effect as the gray level of the pixel.
Fig. 2 is the schematic block diagram of the LED display according to the utility model embodiment.LED display screen system 200 includes
The LED unit plate 220-1 to 220-N of LED display controllers 210 and N number of concatenation, wherein N are 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, the LED display can drive N*A*B LED altogether.
LED display controllers 210 provide 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 outputs of latch signal LE and first
Enable signal OE.
It is different from the LED display 100 shown in Fig. 1, LED is also included according to the LED display 200 of the embodiment and protects electricity
Road 230.In this embodiment, LED protection circuit 230 is connected between LED display controllers 210 and LED unit plate 220-1,
For enabling signal OE and the output enable signal of clock signal clk generation the 3rd according to the first outputLED unit plate 220-1
LED drive circuit into LED unit plate 220-N enables signal according to the 3rd outputDriving current is provided.
LED display according to other aspects of the LED display 200 of the embodiment with Fig. 1 is identical, herein no longer
It is described in detail.
In this embodiment, LED protection circuit 230 is arranged on LED display controllers 210 and first LED unit plate
Between.In an alternative embodiment, LED protection circuit 230 can be arranged on inside LED display controllers 210, so that
The defencive function of whole LED display is provided in control end.In another alternative embodiment, LED protection circuit 230 can be with
The inside of LED unit plate is arranged on, or even is integrated with LED drive circuit, one single chip is formed, so as to provide single
The defencive function of LED modules.
Fig. 3 shows the schematic block diagram of the LED drive circuit used in the LED display shown in Fig. 2.As shown in figure 3,
Each LED unit plates of the LED unit plate 220-1 into LED unit plate 220-N can include one or more LED drive circuits.
Each LED drive circuit has identical 26S Proteasome Structure and Function.Illustrated herein by taking one of LED drive circuit 221 as an example.
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 controls end 210, LED drive circuits of the serial data signal SDI from LED display controls end 210 or previous stage
221.Under the control of clock signal clk, shift register 2211 is shifted to 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 latch signal LE control, the multi-bit digital value that the temporary transient latch shift register 2211 of latch 2212 is stored.
Latch 2212 is respectively connecting to the respective first input ends of door U0 to Un, to receive multi-bit digital value, second
Input is commonly connected to NOT gate U11.NOT gate U11 input receives the 3rd output and enables signalNOT gate U11 with door
U0 to Un constitutes output and enables circuit together, and signal is enabled in the 3rd outputWhen effectively, provided with door U0 to Un output end
Multi-bit digital value.
Switching tube Q0 to Qn control end is respectively connecting to door U0 to Un output end, for controlling switch pipe Q0 to Qn
Conducting and disconnection.Switching tube Q0 to Qn is connected in series in output end respectively with constant-current source IS0 to ISn respectivelyExtremelyBetween ground, so that when switching tube is turned in output endExtremelyThere is provided and each digital value phase respectively
Corresponding driving current, so as to drive LED to light.
In this embodiment, the 3rd output enables signalBy with door U0 to Un control output endsExtremelyOutput level.When the 3rd output enables signalFor it is effective when, inverted device it is anti-phase after " shut-off " output end with
Door, LED extinguishes.When the 3rd output enables signalFor it is invalid when, inverted device it is anti-phase after " open-minded " output end with door, permit
Perhaps each LED is lighted when D0~Dn is high level.
In this embodiment, describe LED drive circuit shown in Fig. 3 and include shift register, latch, by NOT gate and
Multiple constant-current source circuits for enabling circuit with the output that door is constituted, being composed in series by constant-current source and switching tube.However, this practicality is new
Type not limited to this.The utility model can apply to any drive circuit that circuit is enabled including output.
In this embodiment, the 3rd output enables signalIn low level effectively, invalid in high level, output makes
Phase inverter U11 in energy circuit is used to the 3rd output enabling signalLow transition into high level, or vice versa.However,
The utility model not limited to this.If the 3rd output enables signalIn high level effectively, in low level effectively, then may be used
To save the phase inverter U11 in output enable circuit.
Fig. 4 shows the schematic block diagram of the LED protection circuit used in the LED display shown in Fig. 2.LED protection electricity
Road 230 is for example connected between LED display controllers 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 output end provides the second output and enables signal EN.Filtering
Circuit 231 is, for example, one kind in RC filter circuits, LC filter circuits, active low-pass filter circuit, clock signal clk filter
The second output is produced after wave circuit 231 and enables signal EN.
NAND gate U21 first input end and the second input receive the first output and enable the outputs of signal OE and second respectively
Signal EN is enabled, output end provides the 3rd output and enables signal
It is effective in high level that the first output that LED display controllers 210 are provided enables signal OE so that LED is lighted,
It is invalid during low level so that LED extinguishes.Correspondingly, the 3rd output that LED protection circuit 230 is provided enables signalIn low electricity
It is usually effective so that LED is lighted, it is invalid in high level so that LED extinguishes.
When communication between the control end of LED display screen system and display screen end is normal, filter circuit 231 believes clock
Number CLK low level is filtered out, and it is high level signal that the second output that filter circuit 231 is produced, which enables signal EN,.Now, if
It is high level that one output, which enables signal OE, and the output signal of the NAND gate is that the 3rd output enables signalFor low level.The
Three outputs enable signalLED drive circuit is controlled, and in low level effectively, so as to light LED.If first is defeated
Go out to enable signal OE for low level, the output signal of the NAND gate is that the 3rd output enables signalFor high level.3rd is defeated
Go out to enable signalLED drive circuit is controlled, and it is invalid in high level, so as to turn off LED.
During communication abnormality between the control end of LED display screen system and display screen end, clock signal clk is not defeated
Enter, it is low level signal that the second output that filter circuit 231 is produced, which enables signal EN,.Now, no matter the first output enables signal
OE is high level or low level, and the output signal of the NAND gate is that the 3rd output enables signalFor high level.3rd is defeated
Go out to enable signalLED drive circuit is controlled, and, so as to turn off LED all the time. in high level effectively.
In this embodiment, the 3rd output enables signalIn low level effectively, in high level effectively, output makes
Phase inverter U11 in energy circuit is used to the 3rd output enabling signalLow transition into high level, or vice versa.However,
The utility model not limited to this.If the 3rd output enables signalIn high level effectively, it is invalid in low level, then may be used
To save the phase inverter U11 in output enable circuit.
The LED display controllers 210 can be when, line faulty in LED display be disconnected or control end is stopped, shut-off
LED display, saves power consumption, extends LED lifetime of LED.
Fig. 5 shows the working waveform figure of the LED display according to the utility model embodiment.Fig. 5 shows the LED in Fig. 2
The working waveform figure of display screen 200.
LED display controllers 210 provide serial data signal SDI to LED unit plate, and including clock signal clk, lock
Deposit the control signal that the outputs of signal LE and first enable signal OE.LED protection circuit 230 produces second according to clock signal clk
Output enables signal EN, and further exporting to enable the outputs of signal OE and second and enable signal EN and produce the 3rd and export according to first makes
Can signalLED drive circuit 221 on LED unit plate enables letter using clock signal, the outputs of latch signal LE and the 3rd
NumberAs control signal, the long numeric data in serial data signal SDI drives multiple LED.
As shown in figure 5, during the proper communication of LED display controllers 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.
It is changed into the latch in effective status, LED drive circuit 221 from disarmed state in moment t0, latch signal LE
Under latch signal LE control, the long numeric data that temporary transient latch shift register is obtained.
In 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, and the second output produced according to clock signal clk enables letter
Number EN is always high level, and LED protection circuit 230, which enables the outputs of signal OE and second according to the first output and enables signal EN, to be produced
3rd output enables signalNow, the 3rd output enables signalIt is the inverted version that the first output enables signal OE.
First output enable signal OE from disarmed state be changed into effective status while, the 3rd output enable 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 is temporarily latched and turn on and disconnect, in output endExtremelyThere is provided and each digital value phase respectively
Corresponding driving current, so as to drive LED to light.
In moment t2, the first output enables signal OE and is changed into disarmed state from effective status, correspondingly, and 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 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 light according to serial data signal SDI,
So as to complete the display of a two field picture.In continuous multiple frame periods, the driving of LED drive circuit 221 LED lights, so that
Complete the display of dynamic image.
In this embodiment, the first output enable signal OE is effective in high level, and the 3rd output enables signalLow
It is effective during level.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 in high level.
Different from above-mentioned proper communication, in the communication abnormality of LED display controllers 210 and LED unit plate, LED drives
Shift register and latch in dynamic circuit 221 still store the multi-bit digital value in a drive cycle.
LED display controllers 210 no longer will provide clock signal clk to LED unit plate.LED protection circuit 230 passes through filter
It is always low level that the second output that wave circuit is produced, which enables signal EN, and LED protection circuit 230 enables signal according to the first output
The outputs of OE and second enable signal EN and produce 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 that LED drive circuit 221 is stored, the lock of mistake is also whether received
Deposit the outputs of signal LE and first and enable signal OE, LED drive circuit 221 disconnects the switching tube in constant-current source all the time, so as to forbid
Drive circuit is provided to input, so that LED extinguishes.
In the above-described embodiment, LED protection circuit is described by detecting clock signal clk, and producing the second output makes
Energy signal EN, further enables the output of the output enable signal EN of signal OE and second generations the 3rd according to the first output and enables signalLED drive circuit enables signal according to the 3rd outputEnable or disable output end.Therefore, LED display controllers with
It is disarmed state because the first output enables signal and the second output enable signal when communication between LED unit plate disconnects,
Therefore the output end of LED drive circuit can be disabled, until communication recovery is normal.
The utility model realizes automatically shutting down during LED display no signal using LED protection circuit, so as to ensure that
LED display occurs without error image.The utility model circuit is simple, practical and reliable, has both extended the use of light emitting diode
Life-span, while also reducing the energy consumption of system.
According to embodiment of the present utility model as described above, these embodiments do not have all details of detailed descriptionthe,
Also it is only described specific embodiment not limit the utility model.Obviously, as described above, many modifications and change can be made
Change.This specification is chosen and specifically describes these embodiments, be in order to preferably explain principle of the present utility model and it is actual should
With so that skilled artisan can repairing using the utility model and on the basis of the utility model well
Change and use.The scope that protection domain of the present utility model should be defined by the utility model claim is defined.
Claims (14)
1. a kind of LED display, it is characterised in that including：
LED display controllers, signal is enabled for providing serial data signal, clock signal and the first output；
LED protection circuit, is connected with the LED display controllers, is enabled according to the clock signal and first output
Signal produces the 3rd output and enables signal；And
Multiple LED drive circuits, are connected with the LED display controllers and the LED protection circuit, according to the serial number
It is believed that number offer driving current,
Multiple LED, are connected with the multiple LED drive circuit, and are lighted in the presence of driving current, so as to be used as institute
State the pixel of LED display.
2. LED display according to claim 1, it is characterised in that the multiple LED drive circuit drives described respectively
Corresponding set of LED in multiple LED.
3. LED display according to claim 2, it is characterised in that the multiple LED drive circuit cascades with one another company
Connect, and on multiple LED unit plates.
4. LED display according to claim 3, it is characterised in that the multiple LED drive circuit includes neighbouring described
First LED drive circuit of LED display controllers, the LED drive circuit is located at the LED display controllers and described first
Between LED drive circuit, so that providing public the 3rd output to the multiple LED drive circuit enables signal.
5. LED display according to claim 3, it is characterised in that the LED protection circuit includes multiple protection moulds
Block, the multiple protection module is connected with the multiple LED drive circuit respectively, so as to the multiple LED drive circuit
Respective 3rd output is provided respectively and enables signal.
6. LED display according to claim 3, it is characterised in that the multiple LED drive circuit respectively with it is corresponding
One protection module is integrated in same chip.
7. LED display according to claim 1, it is characterised in that the multiple LED drive circuit includes respectively：
Constant-current source circuit, for according to serial data signal, driving current to be provided to the output end of LED drive circuit；And
Output enables circuit, for enabling signal according to the described 3rd output, enables or disables the constant-current source circuit.
8. LED display according to claim 7, it is characterised in that the constant-current circuit includes：
Constant-current source, for producing the electric current of constant as driving current；And
Switching tube, is connected in series with the constant-current source, when the switching tube is turned on, and is provided in the output end of LED drive circuit
The driving current.
9. LED display according to claim 8, it is characterised in that the output, which enables circuit, to be included：
NOT gate, enables signal, and produce the inversion signal that the 3rd output enables signal for receiving the 3rd output；
And
With door, the inversion signal and the serial data signal of signal are enabled for receiving the 3rd output, and to institute
State switching tube and switch controlling signal is provided, to control the conducting state of the switching tube.
10. LED display according to claim 9, it is characterised in that the LED drive circuit also includes：
Shift register, for the serial data signal being shifted and being stored multi-bit digital value；And
Latch, the multi-bit digital value is provided for temporarily depositing and enabling circuit to the output,
Wherein, the LED display controllers provide the clock signal and the serial data signal to the shift register,
The LED display controllers provide latch signal to the latch.
11. a kind of protection circuit for LED display, it is characterised in that including：
Filter circuit, for receiving clock signal, and is filtered to produce the second output enable signal to clock signal；
Logic circuit, is connected with the filter circuit, and signal is enabled for receiving second output, and it is defeated to receive first
Go out and enable signal, and signal is enabled according to the first output enable signal and the second output and produce the 3rd output enable signal,
Wherein, the 3rd output enables signal and is used to enable or disable the LED offer driving currents to the LED display.
12. protection circuit according to claim 11, it is characterised in that the filter circuit includes being selected from RC filtered electricals
One kind in road, LC filter circuits, active low-pass filter circuit.
13. protection circuit according to claim 11, it is characterised in that the work of the logic circuit causes described
When one output enables signal and effective the second output enable signal, the 3rd output enables signal effectively, Yi Ji
It is described first output enable signal and it is described second output enable signal any one it is invalid when, it is described 3rd output enable signal without
Effect.
14. protection circuit according to claim 13, it is characterised in that the logic circuit is NAND gate, described first
Output enables signal and the second output enable circuit is effective in high level, and the 3rd output enables signal in low level
Shi Youxiao.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621103337.6U CN206379156U (en) | 2016-10-08 | 2016-10-08 | LED display and its protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621103337.6U CN206379156U (en) | 2016-10-08 | 2016-10-08 | LED display and its protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206379156U true CN206379156U (en) | 2017-08-04 |
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| CN201621103337.6U Active CN206379156U (en) | 2016-10-08 | 2016-10-08 | LED display and its protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106297652A (en) * | 2016-10-08 | 2017-01-04 | 杭州视芯科技有限公司 | LED display and protection circuit thereof and control method |
| CN111798792A (en) * | 2020-09-08 | 2020-10-20 | 杭州视芯科技有限公司 | LED display system, constant current driving circuit and display control method |
-
2016
- 2016-10-08 CN CN201621103337.6U patent/CN206379156U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106297652A (en) * | 2016-10-08 | 2017-01-04 | 杭州视芯科技有限公司 | LED display and protection circuit thereof and control method |
| CN106297652B (en) * | 2016-10-08 | 2019-08-27 | 杭州视芯科技有限公司 | LED display and its control method |
| CN111798792A (en) * | 2020-09-08 | 2020-10-20 | 杭州视芯科技有限公司 | LED display system, constant current driving circuit and display control method |
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