CN105657905B - A kind of LED drive chip, LED drive circuit and LED display - Google Patents
A kind of LED drive chip, LED drive circuit and LED display Download PDFInfo
- Publication number
- CN105657905B CN105657905B CN201610137394.4A CN201610137394A CN105657905B CN 105657905 B CN105657905 B CN 105657905B CN 201610137394 A CN201610137394 A CN 201610137394A CN 105657905 B CN105657905 B CN 105657905B
- Authority
- CN
- China
- Prior art keywords
- control
- led
- pin
- led drive
- drive chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Led Devices (AREA)
Abstract
The invention belongs to LED drive controls field, there is provided a kind of LED drive chip, LED drive circuit and LED display.LED drive circuit includes the LED drive chip of multiple cascades, and LED drive chip includes：Serial shift unit, drive control unit and shaping output unit；Serial shift unit receives the control signal of outside in a manner of single line communication, and control data corresponding with the LED drive chip in the control signal is intercepted, drive control unit is driven control to LED according to the control data, and shaping output unit will export after the remaining data shaping in the control signal.In the present invention, LED drive circuit has only used a kind of chip that the drive control to LED can be achieved, and simplifies circuit structure, reduce maintenance cost, and LED drive circuit is driven control by way of single line communication, simplifies communication protocol, reduces cascading errors.
Description
Technical field
The invention belongs to LED drive controls field, more particularly to a kind of LED drive chip, LED drive circuit and LED to show
Display screen.
Background technology
LED (Light Emitting Diode) display screen is a kind of display mode by controlling LED, to show text
The display screen of the various information such as word, figure, image, animation, market, video, video signal.
Traditional LED display drive scheme is come by using LED drive chip 595 and some other companion chips
Realize.Monochromatic module such as one piece of P10 needs 16 SM74HC595 chips, 4 MW4953 chips, 1 SM74HC245 core
Piece and 1 SM74HC138 chip, the chip portfolio of this 4 type get up, the common drive control realized to LED display, such as
Shown in Fig. 1, outside control signal (including row control signal A/B, data-signal SER and system control signal SCK/RCK) warp
Exported after crossing chip SM74HC245 amplification shapings, wherein, row control signal A/B controls core after being decoded by chip SM74HC138
Piece MW4953 Push And Release, which is realized, to be controlled the row of LED display；The tunnels of system control signal SCK/RCK mono- are used for control chip
595, another way is used for next stage cascade Mach-Zehnder interferometer；And data-signal SER is used as down after 595 chip serial transfers of multiple series connection
The data-signal SER inputs of level.It follows that when being driven control to LED display, traditional scheme is using multi-thread
The communication protocol of control, i.e., by multiple control ports, the switch to LED display, brightness etc. are controlled respectively.
The chip type that traditional LED display drive scheme is used is more, and circuit is complicated, and pole is caused to trouble hunting
Big inconvenience, adds maintenance cost；And traditional LED display drive scheme uses multi-thread control mode, control protocol is multiple
Miscellaneous, display refresher rate is low, and signal easily disturbs, and does not have current class regulatory function.
The content of the invention
The purpose of the embodiment of the present invention is to provide a kind of LED drive circuit, it is intended to solves traditional LED display driving
The chip type that scheme is used is more, and circuit is complicated, causes barrier maintenance inconvenience, and traditional LED display drive scheme control
Agreement processed is complicated, and signal easily disturbs, the problem of the function such as no current regulation.
The embodiment of the present invention is achieved in that a kind of LED drive chip, and for driving LED, the LED drives core
Piece includes：
Received in a manner of single line communication outside control signal, and in the control signal with the LED drive chip
The serial shift unit that corresponding control data is intercepted；
It is connected with the output end of the serial shift unit, the control data that the serial shift unit intercepts is entered
The memory cell that row preserves；
It is connected with the output end of the memory cell, the control data intercepted according to the serial shift unit is to phase
The LED answered is driven the drive control unit of control；
It is connected, will be intercepted in the control signal through the serial shift unit with the output end of the serial shift unit
Remaining data afterwards carries out shaping and the shaping output unit exported.
The another object of the embodiment of the present invention, which also resides in, provides a kind of LED drive circuit, the LED drive circuit and LED
Display module connects, and the LED display module includes multiple LEDs, it is characterised in that the LED drive circuit includes multiple
The LED drive chip of cascade, the LED drive chip include：
Received in a manner of single line communication outside control signal, and in the control signal with the LED drive chip
The serial shift unit that corresponding control data is intercepted；
It is connected with the output end of the serial shift unit, the control data that the serial shift unit intercepts is entered
The memory cell that row preserves；
It is connected with the output end of the memory cell, the control data intercepted according to the serial shift unit is to institute
State the drive control unit that multiple LEDs are driven control；
It is connected, will be intercepted in the control signal through the serial shift unit with the output end of the serial shift unit
Remaining data afterwards carries out shaping and exported to the shaping output unit of rear class LED drive chip；
The remaining data includes：The control data corresponding with each LED drive chip of rear class respectively, and to institute
The current regulation data that the output current of some LED drive chips is adjusted；
The input of the serial shift unit of first LED drive chip is defeated for the control signal of the LED drive circuit
Enter end.
Further, the form of the control signal is：The control data of+the first LED drive chip of RESET signal+
The control data of second LED drive chip+... the control data of+n-th LED drive chip+current regulation data, institute
A data high position in control signal is stated preceding, low level is rear.
Further, each LED drive chip connects 4 groups of LEDs, and the negative electrode of first group of LED is connected to the LED drivings altogether
First control pin of chip, the negative electrode of second group of LED are connected to the second control pin of the LED drive chip, the 3rd group of LED altogether
The negative electrode of lamp is connected to the 3rd control pin of the LED drive chip altogether, and the negative electrode of the 4th group of LED is connected to the LED drivings altogether
4th control pin of chip.
Further, the number of every group of LED is 8, and the anode of every group of LED connects the LED drive chip respectively
First switch pin, second switch pin, the 3rd switch pin, the 4th switch pin, the 5th switch pin, the 6th switch pin, the 7th switch pin
With the 8th switch pin.
Further, the corresponding control data of each LED drive chip is 32Bit, and each LED corresponds to 1Bit's
Control data, the memory capacity of the control data memory module in the memory cell are 4Byte, the control number of the 32Bit
It is stored according to corresponding in the control data memory module of the 4Byte.
Further, to control pin be low level when the first of the LED drive chip, the second of the LED drive chip
When control pin, the 3rd control pin and the 4th control pin are high-impedance state, first group of LED stores according to the control data
The first Byte stored in module control data is shown；To control pin be low level when the second of the LED drive chip,
When the first control pin, the 3rd control pin and the 4th control pin of the LED drive chip are high-impedance state, second group of LED
Lamp is shown according to the 2nd Byte stored in the control data memory module control data；When the LED drives core
It is low level that the 3rd of piece, which controls pin, and the first control pin, the second control pin and the 4th control pin of the LED drive chip are
During high-impedance state, the 3rd group of LED is entered according to the 3rd Byte stored in the control data memory module control data
Row display；To control pin be low level when the 4th of the LED drive chip, the first control pin of the LED drive chip, second
When control pin and the 3rd control pin are high-impedance state, the 4th group of LED stores according in the control data memory module
The 4th Byte control data shown.
Further, the number of every group of LED is 16, and the anode of every group of LED connects the LED drive chip respectively
First switch pin, second switch pin, the 3rd switch pin, the 4th switch pin, the 5th switch pin, the 6th switch pin, the 7th switch pin,
8th switch pin, the 9th switch pin, the tenth switch pin, the 11st switch pin, the 12nd switch pin, the 13rd switch pin, the tenth
Four switch pin, the 15th switch pin and sixteenmo close pin.
Further, the corresponding control data of each LED drive chip is 64Bit, and each LED corresponds to 1Bit's
Control data, the memory capacity of the control data memory module in the memory cell are 8Byte, the control number of the 64Bit
It is stored according to corresponding in the control data memory module of the 8Byte.
Further, to control pin be low level when the first of the LED drive chip, the second of the LED drive chip
When control pin, the 3rd control pin and the 4th control pin are high-impedance state, first group of LED stores according to the control data
The first Byte and the 2nd Byte control data stored in module is shown；When the second control of the LED drive chip
Pin is low level, when the first control pin, the 3rd control pin and the 4th control pin of the LED drive chip are high-impedance state, institute
Second group of LED is stated to be carried out according to the 3rd Byte and the 4th Byte stored in the control data memory module control data
Display；To control pin be low level when the 3rd of the LED drive chip, the first control pin of the LED drive chip, the second control
Pin processed and the 4th control pin be when being high-impedance state, and the 3rd group of LED in the control data memory module according to storing
5th Byte and the 6th Byte control data is shown；To control pin be low level when the 4th of the LED drive chip, institute
When the first control pin, the second control pin and the 3rd control pin for stating LED drive chip are high-impedance state, the 4th group of LED
The 7th Byte and the 8th Byte control data according to being stored in the control data memory module are shown.
The another object of the embodiment of the present invention, which also resides in, provides a kind of LED display, and the LED display includes above-mentioned institute
The LED drive circuit stated.
In an embodiment of the present invention, the LED drive circuit includes the LED drive chip of multiple cascades, and the LED drives
Dynamic chip includes：Serial shift unit, drive control unit and shaping output unit；The serial shift unit is with single line communication
Mode receive the control signal of outside, and control data corresponding with the LED drive chip in the control signal is entered
Row interception, the drive control unit are driven control to LED according to the control data, and the shaping output unit will
Exported after remaining data shaping in the control signal after interception.In an embodiment of the present invention, the LED drive circuit
Only use a kind of chip that the drive control to LED can be achieved, simplified circuit structure, reduce maintenance cost, and it is described
LED drive circuit is driven control by way of single line communication, simplifies communication protocol, reduces cascading errors, control
Current regulation data in signal directly can carry out different grades of regulation to the output current of chip.
Brief description of the drawings
Fig. 1 is the function structure chart for the LED drive circuit that prior art provides；
Fig. 2 is the cut-away view of LED drive chip provided in an embodiment of the present invention；
Fig. 3 is the function structure chart of LED drive circuit provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of control signal of the input provided in an embodiment of the present invention to each LED drive chip；
Fig. 5 is the form schematic diagram of control signal provided in an embodiment of the present invention；
Fig. 6 is the peripheral circuit diagram of LED drive chip provided in an embodiment of the present invention；
Fig. 7 is the form schematic diagram for the control signal that another embodiment of the present invention provides；
Fig. 8 is the peripheral circuit diagram for the LED drive chip that another embodiment of the present invention provides；
Fig. 9 is the timing diagram of each control pin of LED drive chip provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Embodiment one：
First embodiment of the invention provides a kind of LED drive chip.
Fig. 2 shows the cut-away view for the LED drive chip that first embodiment of the invention provides, for convenience of description,
It illustrate only the part related to the embodiment of the present invention.
A kind of LED drive chip U1, for driving LED, LED drive chip U1 includes：
Received in a manner of single line communication outside control signal, and in the control signal with the LED drive chip
The serial shift unit 201 that corresponding control data is intercepted.In the present embodiment, LED drive chip U1 passes through single
Control signal outside port Din receptions, control protocol is simplified, outside control signal includes and the LED drive chip phase
Corresponding control data, in addition to other control datas.
It is connected with the output end of serial shift unit 201, the control data pair intercepted according to serial shift unit 201
Corresponding LED is driven the drive control unit 203 of control.
Be connected with the output end of serial shift unit 201, by the control signal after serial shift unit 201 intercepts
Remaining data carry out shaping and export shaping output unit 204.
In the present embodiment, shaping output unit 204 by the control signal after serial shift unit 201 intercepts
Remaining data carries out shaping, and data 1 and the control data for representing data 0 will be represented in remaining data by processing, is exported corresponding
Standard data 1 or data 0.
As one embodiment of the invention, LED drive chip U1 also includes：
It is connected between serial shift unit 201 and drive control unit 203, the institute that serial shift unit 201 is intercepted
State the memory cell 202 that control data is preserved.In the present embodiment, memory cell 202 can be made up of multiple registers.
Embodiment two：
Second embodiment of the invention provides a kind of LED drive circuit.
Fig. 3 shows the function structure chart of LED drive circuit provided in an embodiment of the present invention, for convenience of description, only shows
The part related to the embodiment of the present invention is gone out.
A kind of LED drive circuit, it is connected with LED display module 2, LED display module 2 includes multiple LEDs, the LED
Drive circuit includes the LED drive chip U1 of multiple cascades.LED drive chip U1 includes：
The control signal CON of outside is received in a manner of single line communication, and to driving core with the LED in control signal CON
The serial shift unit 201 that the corresponding control data of piece is intercepted.
In the present embodiment, the control signal CON includes the control data corresponding with each LED drive chip U1
(including display data and brightness data), and the current data that the output currents of all LED drive chips is adjusted.
It is connected with the output end of serial shift unit 201, the control data pair intercepted according to serial shift unit 201
The multiple LED is driven the drive control unit 203 of control.
Be connected with the output end of serial shift unit 201, by the control signal after serial shift unit 201 intercepts
Remaining data carry out shaping and export to rear class LED drive chip shaping output unit 204.
Wherein, the remaining data includes：The control data corresponding with each LED drive chip of rear class respectively, with
And the current regulation data that the output currents of all LED drive chips is adjusted.
As one embodiment of the invention, LED drive chip U1 also includes：
It is connected between serial shift unit 201 and drive control unit 203, the institute that serial shift unit 201 is intercepted
State the memory cell 202 that control data is preserved.
Fig. 3 be by three cascade LED drive chip U1 exemplified by illustrate, can increase according to the actual requirements certainly or
Reduce the number of the LED drive chip of cascade.In figure 3, the input Din of first LED drive chip 101 is the LED
The control signal input of drive circuit, the input Din of second LED drive chip 102 connect first LED drive chip
101 output end Dout, the input Din of the 3rd LED drive chip 103 connect the output end of second LED drive chip 102
Dout。
As one embodiment of the invention, the input of the serial shift unit 201 of first LED drive chip is described
The control signal input of LED drive circuit, the output end of the shaping output unit 204 of last LED drive chip is institute
State the output end of LED drive circuit.In the present embodiment, the serial shift unit 201 of first LED drive chip 101 is defeated
Enter control signal input of the end for the LED drive circuit, the shaping output unit 204 of the 3rd LED drive chip 103
Output end is the output end of the LED drive circuit.
Fig. 4 shows the form schematic diagram of control signal provided in an embodiment of the present invention, for convenience of description, illustrate only
The part related to the embodiment of the present invention.
As one embodiment of the invention, the form of the control signal is：+ the first LED drive chip of RESET signal
+ the second LED drive chip of control data control data+... control data+electric current of+n-th LED drive chip
Adjust data.
In the present embodiment, by taking the LED drive chip U1 that the LED drive circuit includes three cascades as an example, input is extremely
The control signal of first LED drive chip 101 is：The control data+the second of+the first LED drive chip of RESET signal
Control data+current regulation the data of three LED drive chips of control data+the of LED drive chip.First LED driving
The serial shift unit 201 of chip 101 receives the control signal by its input Din, and by the control signal with
Its corresponding control data (control data of i.e. first LED drive chip) is exported to shaping output unit after being intercepted
204, shaping output unit 204 will be exported to second LED drive chip after the remaining data shaping in the control signal
102, the remaining data includes：Second LED drives the control data+electricity of three LED drive chips of control data+the of chip
Stream regulation data.The control signal that second LED drive chip 102 receives is：The control of second LED drive chip of RESET+
Control data+current regulation the data of three LED drive chips of data+the processed, the serial shifting of second LED drive chip 102
Bit location 201 receives the control signal by its input Din, and by the control number in the control signal corresponding thereto
Exported after being intercepted according to (control data of i.e. second LED drive chip) to shaping output unit 204, shaping output unit
204 will export to the 3rd LED drive chip 103, the remaining data bag after the remaining data shaping in the control signal
Include：The control data of 3rd LED drive chip+current regulation data.The control that 3rd LED drive chip 103 receives
Signal is：Control data+current regulation data of the 3rd LED drive chip of RESET+, the 3rd LED drive chip 103
Serial shift unit 201 receives the control signal by its input Din, and by the control signal corresponding thereto
To shaping output unit 204, shaping is defeated for output after control data (control data of i.e. the 3rd LED drive chip) is intercepted
Going out unit 204 will export after the remaining data shaping in the control signal, and the remaining data includes：Current regulation data.
Fig. 6 shows the peripheral circuit diagram of LED drive chip provided in an embodiment of the present invention, for convenience of description, only shows
The part related to the embodiment of the present invention is gone out.
As one embodiment of the invention, each LED drive chip U1 connects 4 groups of LEDs, and the negative electrode of first group of LED is total to
LED drive chip U1 the first control pin C0 is connected to, the negative electrode of second group of LED is connected to LED drive chip U1 the second control altogether
Pin C1 processed, the negative electrode of the 3rd group of LED are connected to LED drive chip U1 the 3rd control pin C2 altogether, and the negative electrode of the 4th group of LED is total to
It is connected to LED drive chip U1 the 4th control pin C3.
As one embodiment of the invention, the number of every group of LED is 8, and the anode of every group of LED connects LED drives respectively
Dynamic chip U1 first switch pin S0, second switch pin S1, the 3rd switch pin S2, the 4th switch pin S3, the 5th switch pin S4, the
Six switch pin S5, the 7th switch pin S6 and the 8th switch pin S7.
As one embodiment of the invention, control data corresponding each LED drive chip U1 is 32Bit, each
LED corresponds to 1Bit control data, and the memory capacity of the control data memory module in memory cell 202 is 4Byte, described
32Bit control data is correspondingly stored in the control data memory module of the 4Byte.
Fig. 5 shows the schematic diagram of control signal of the input provided in an embodiment of the present invention to each LED drive chip, is
It is easy to illustrate, illustrate only the part related to the embodiment of the present invention.
As one embodiment of the invention, a data high position in the control signal is preceding, and low level is rear.In the present embodiment
In, when the number that every group connects LED be 8, i.e., when each LDE driving chips connect 32 LEDs, input to each LED drive
The control signal of dynamic chip includes 32Bit control data (b31~b0 in Fig. 5) and 4Bit current regulation data (in Fig. 5
B3~B0).
As one embodiment of the invention, to control pin C0 be low level when the first of LED drive chip U1, LED driving cores
When piece U1 the second control pin C1, the 3rd control pin C2 and the 4th control pin C3 are high-impedance state, first group of LED is according to control
The first Byte stored in data memory module control data is shown；As LED drive chip U1 the second control pin C1
For low level, when LED drive chip U1 the first control pin C0, the 3rd control pin C2 and the 4th control pin C3 are high-impedance state,
Second group of LED is shown according to the 2nd Byte stored in control data memory module control data；When LED drives core
It is low level that the 3rd of piece U1, which controls pin C2, and LED drive chip U1 the first control pin C0, the second control pin C1 and the 4th are controlled
When pin C3 is high-impedance state, the 3rd group of LED is entered according to the 3rd Byte stored in control data memory module control data
Row display；To control pin C3 be low level when the 4th of LED drive chip U1, LED drive chip U1 the first control pin C0, second
The controls of pin C1 and the 3rd pin C2 is controlled when being high-impedance state, the 4th group of LED is according to the stored in control data memory module
Four Byte control data is shown.First group of LED, second group of LED, the 3rd group of LED and the 4th group of LED are one by one
It has been shown that, form a display cycle, display frequency is up to 1KHz.
For example, if the first Byte stored in control data memory module control data is 00001111, when LED drives
It is low level that the first of chip U1, which controls pin C0, and LED drive chip U2 the second control pin C1, the 3rd control pin C2 and the 4th are controlled
When pin C3 processed is high-impedance state, first group of LED is shown that 1 represents LED according to the first Byte control data 00001111
The anode of lamp is high-impedance state, and LED is bright, and 0 anode for representing LED is low level, and LED does not work.
Fig. 9 shows the timing diagram of each control pin of LED drive chip provided in an embodiment of the present invention, for the ease of saying
It is bright, it illustrate only the part related to the embodiment of the present invention.
As one embodiment of the invention, LED drive chip U1 the first control pin C0, the second control pin C1, the 3rd control
The control pin C3 of pin C2 processed and the 4th carry out loop control according to timing diagram as shown in Figure 9.
Fig. 8 shows the peripheral circuit diagram for the LED drive chip that another embodiment of the present invention provides, for convenience of description,
It illustrate only the part related to the embodiment of the present invention.
As another embodiment of the present invention, the number of every group of LED is 16, and the anode of every group of LED meets LED respectively
Driving chip U1 first switch pin S0, second switch pin S1, the 3rd switch pin S2, the 4th switch pin S3, the 5th switch pin S4,
6th switch pin S5, the 7th switch pin S6, the 8th switch pin S7, the 9th switch pin S8, the tenth switch pin S9, the 11st switch pin
S10, the 12nd switch pin S11, the 13rd switch pin S12, the 14th switch pin S13, the 15th switch pin S14 and sixteenmo
Close pin S15.
As another embodiment of the present invention, the corresponding control data of each LED drive chip is 64Bit, each
LED corresponds to 1Bit control data, and the memory capacity of the control data memory module in memory cell 202 is 8Byte, described
64Bit control data is correspondingly stored in the control data memory module of the 8Byte.
Fig. 7 show another embodiment of the present invention provide input to each LED drive chip control signal signal
Figure, for convenience of description, illustrate only the part related to the embodiment of the present invention.
As one embodiment of the invention, a data high position in the control signal is preceding, and low level is rear.In the present embodiment
In, when the number that every group connects LED is 16, i.e., when each LDE driving chips connect 64 LEDs, input to each LED
The control signal of driving chip includes 64Bit control data (b63~b0 in Fig. 7) and 4Bit current regulation data (Fig. 7
In B3~B0).
As another embodiment of the present invention, to control pin C0 be low level when the first of LED drive chip U1, LED drivings
When chip U1 the second control pin C1, the 3rd control pin C2 and the 4th control pin C3 are high-impedance state, first group of LED root
Shown according to the first Byte and the 2nd Byte control data that are stored in the control data memory module；When LED drives
It is low level that the second of chip U1, which controls pin C1, and LED drive chip U1 the first control pin C0, the 3rd control pin C2 and the 4th are controlled
When pin C3 processed is high-impedance state, second group of LED according to the 3rd Byte that is stored in the control data memory module and
4th Byte control data is shown；To control pin C2 be low level when the 3rd of LED drive chip U1, LED drive chip
When U1 the first control pin C0, the second control pin C1 and the 4th control pin C3 are high-impedance state, the 3rd group of LED is according to institute
The control data for stating the 5th Byte stored in control data memory module and the 6th Byte is shown；Work as LED drive chip
It is low level that the 4th of U1, which controls pin C3, and LED drive chip U1 the first control pin C0, the second control pin C1 and the 3rd control pin
When C2 is high-impedance state, the 4th group of LED is according to the 7th Byte and the 8th stored in the control data memory module
Byte control data is shown.
For example, if the first Byte and the 2nd Byte control data that are stored in control data memory module are
0000111100001111, to control pin C0 be low level when the first of LED drive chip U1, LED drive chip U2 the second control
When pin C1, the 3rd control pin C2 and the 4th control pin C3 processed are high-impedance state, first group of LED is according to the first Byte and second
Byte control data 0000111100001111 is shown that 1 anode for representing LED is high-impedance state, and LED is bright, and 0 represents
The anode of LED is low level, and LED does not work.
As one embodiment of the invention, the current regulation data include 4Bit, can be to each LED drive chip U1's
Electric current carries out 16 different grades of regulations, the size of current such as institute of table one corresponding to the current regulation data difference of the 4Bit
Show：
Table one
| B3 | B2 | B1 | B0 | Iout(mA) |
| 1 | 1 | 1 | 1 | 47 |
| 1 | 1 | 1 | 0 | 44.6 |
| 1 | 1 | 0 | 1 | 42.2 |
| 1 | 1 | 0 | 0 | 39.9 |
| 1 | 0 | 1 | 1 | 37.5 |
| 1 | 0 | 1 | 0 | 35.1 |
| 1 | 0 | 0 | 1 | 32.8 |
| 1 | 0 | 0 | 0 | 30.4 |
| 0 | 1 | 1 | 1 | 29.2 |
| 0 | 1 | 1 | 0 | 27.7 |
| 0 | 1 | 0 | 1 | 26.2 |
| 0 | 1 | 0 | 0 | 24.8 |
| 0 | 0 | 1 | 1 | 23.3 |
| 0 | 0 | 1 | 0 | 21.8 |
| 0 | 0 | 0 | 1 | 20.4 |
| 0 | 0 | 0 | 0 | 18.9 |
Embodiment three：
Third embodiment of the invention provides a kind of LED display, and the LED display is provided including second embodiment
LED drive circuit.
In an embodiment of the present invention, the LED drive circuit includes the LED drive chip of multiple cascades, and the LED drives
Dynamic chip includes：Serial shift unit, drive control unit and shaping output unit；The serial shift unit is with single line communication
Mode receive the control signal of outside, and control data corresponding with the LED drive chip in the control signal is entered
Row interception, the drive control unit are driven control to LED according to the control data, and the shaping output unit will
Exported after remaining data shaping in the control signal after interception.In an embodiment of the present invention, the LED drive circuit
Only use a kind of chip that the drive control to LED can be achieved, simplified circuit structure, reduce maintenance cost, and it is described
LED drive circuit is driven control by way of single line communication, simplifies communication protocol, reduces cascading errors, control
Current regulation data in signal directly can carry out different grades of regulation to the output current of chip.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (11)
1. a kind of LED drive chip, for driving LED, it is characterised in that the LED drive chip includes：
The control signal of outside is received in a manner of single line communication, and to relative with the LED drive chip in the control signal
The serial shift unit that the control data answered is intercepted；
It is connected with the output end of the serial shift unit, the control data that the serial shift unit intercepts is protected
The memory cell deposited；
It is connected with the output end of the memory cell, the control data intercepted according to the serial shift unit is to corresponding
LED is driven the drive control unit of control；
Be connected with the output end of the serial shift unit, by the control signal through the serial shift unit interception after
Remaining data carries out shaping and the shaping output unit exported；
Wherein, the shaping output unit will represent data 1 and represent the control data of data 0 in the remaining data
Reason, and export the data 1 or data 0 of corresponding standard.
2. a kind of LED drive circuit, is connected with LED display module, the LED display module includes multiple LEDs, and its feature exists
In the LED drive circuit includes the LED drive chip of multiple cascades, and the LED drive chip includes：
The control signal of outside is received in a manner of single line communication, and to relative with the LED drive chip in the control signal
The serial shift unit that the control data answered is intercepted；
It is connected with the output end of the serial shift unit, the control data that the serial shift unit intercepts is protected
The memory cell deposited；
It is connected with the output end of the memory cell, the control data intercepted according to the serial shift unit is to described more
Individual LED is driven the drive control unit of control；
Be connected with the output end of the serial shift unit, by the control signal through the serial shift unit interception after
Remaining data carries out shaping and exported to the shaping output unit of rear class LED drive chip；
Wherein, the shaping output unit will represent data 1 and represent the control data of data 0 in the remaining data
Reason, and export the data 1 or data 0 of corresponding standard；
The remaining data includes：The control data corresponding with each LED drive chip of rear class respectively, and to all
The current regulation data that the output current of LED drive chip is adjusted；
The input of the serial shift unit of first LED drive chip is the control signal input of the LED drive circuit.
3. LED drive circuit as claimed in claim 2, it is characterised in that the form of the control signal is：RESET signal+
The control data of+the second LED drive chip of control data of first LED drive chip+...+n-th LED drives core
The control data of piece+current regulation data, a data high position in the control signal is preceding, and low level is rear.
4. LED drive circuit as claimed in claim 3, it is characterised in that each LED drive chip connects 4 groups of LEDs, and first
The negative electrode of group LED is connected to the first control pin of the LED drive chip altogether, and the negative electrode of second group of LED is connected to the LED altogether
Second control pin of driving chip, the negative electrode of the 3rd group of LED are connected to the 3rd control pin of the LED drive chip altogether, and the 4th
The negative electrode of group LED is connected to the 4th control pin of the LED drive chip altogether.
5. LED drive circuit as claimed in claim 4, it is characterised in that the number of every group of LED is 8, every group of LED
Anode meet the first switch pin of the LED drive chip, second switch pin, the 3rd switch pin, the 4th switch pin, the 5th respectively
Switch pin, the 6th switch pin, the 7th switch pin and the 8th switch pin.
6. LED drive circuit as claimed in claim 5, it is characterised in that the corresponding control number of each LED drive chip
According to for 32Bit, each LED corresponds to 1Bit control data, the storage of the control data memory module in the memory cell
Capacity is 4Byte, and the control data of the 32Bit is correspondingly stored in the control data memory module of the 4Byte.
7. LED drive circuit as claimed in claim 6, it is characterised in that control the pin to be when the first of the LED drive chip
Low level, the second control pin, the 3rd control pin and the 4th control pin of the LED drive chip be when being high-impedance state, and described the
One group of LED is shown according to the first Byte stored in the control data memory module control data；As the LED
It is low level that the second of driving chip, which controls pin, and the first control pin, the 3rd control pin and the 4th of the LED drive chip control
When pin is high-impedance state, second group of LED is according to the 2nd Byte stored in the control data memory module control
Data are shown；To control pin be low level when the 3rd of the LED drive chip, the first control of the LED drive chip
When pin, the second control pin and the 4th control pin are high-impedance state, the 3rd group of LED is according to the control data memory module
3rd Byte of middle storage control data is shown；To control pin be low level when the 4th of the LED drive chip, described
When the first control pin, the second control pin and the 3rd control pin of LED drive chip are high-impedance state, the 4th group of LED root
Shown according to the 4th Byte stored in the control data memory module control data.
8. LED drive circuit as claimed in claim 4, it is characterised in that the number of every group of LED is 16, every group of LED
Anode meet the first switch pin of the LED drive chip, second switch pin, the 3rd switch pin, the 4th switch pin, the 5th respectively
Switch pin, the 6th switch pin, the 7th switch pin, the 8th switch pin, the 9th switch pin, the tenth switch pin, the 11st switch pin, the
12 switch pin, the 13rd switch pin, the 14th switch pin, the 15th switch pin and sixteenmo close pin.
9. LED drive circuit as claimed in claim 8, it is characterised in that the corresponding control number of each LED drive chip
According to for 64Bit, each LED corresponds to 1Bit control data, the storage of the control data memory module in the memory cell
Capacity is 8Byte, and the control data of the 64Bit is correspondingly stored in the control data memory module of the 8Byte.
10. LED drive circuit as claimed in claim 9, it is characterised in that first when the LED drive chip controls pin
It is described when the second control pin, the 3rd control pin and the 4th control pin of the LED drive chip are high-impedance state for low level
First group of LED is shown according to the first Byte and the 2nd Byte control data that are stored in the control data memory module
Show；To control pin be low level when the second of the LED drive chip, the first control pin of the LED drive chip, the 3rd control
Pin and the 4th control pin be when being high-impedance state, and second group of LED is according to the stored in the control data memory module
Three Byte and the 4th Byte control data are shown；To control pin be low level when the 3rd of the LED drive chip, described
When the first control pin, the second control pin and the 4th control pin of LED drive chip are high-impedance state, the 3rd group of LED root
Shown according to the 5th Byte and the 6th Byte control data that are stored in the control data memory module；As the LED
It is low level that the 4th of driving chip, which controls pin, the first control pin, the second control pin and the 3rd control of the LED drive chip
When pin is high-impedance state, the 4th group of LED is according to the 7th Byte and the 8th stored in the control data memory module
Byte control data is shown.
11. a kind of LED display, it is characterised in that the LED display is included as described in claim 2~10 any one
LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137394.4A CN105657905B (en) | 2016-03-11 | 2016-03-11 | A kind of LED drive chip, LED drive circuit and LED display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610137394.4A CN105657905B (en) | 2016-03-11 | 2016-03-11 | A kind of LED drive chip, LED drive circuit and LED display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105657905A CN105657905A (en) | 2016-06-08 |
| CN105657905B true CN105657905B (en) | 2017-12-26 |
Family
ID=56493561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610137394.4A Active CN105657905B (en) | 2016-03-11 | 2016-03-11 | A kind of LED drive chip, LED drive circuit and LED display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105657905B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018081614A (en) * | 2016-11-18 | 2018-05-24 | コニカミノルタ株式会社 | Image processing apparatus, image processing method, image forming apparatus, and image display device |
| CN107689207B (en) * | 2017-11-03 | 2023-08-04 | 红品晶英科技（深圳）有限公司 | Circuit structure for displaying patterns on mobile phone rear cover |
| CN110784962B (en) * | 2018-07-30 | 2022-02-15 | 上海雷舞照明技术有限公司 | Cascaded lighting system and lighting method |
| CN109451629A (en) * | 2018-12-25 | 2019-03-08 | 深圳市越宏普照照明科技有限公司 | It can online lighting control system and lighting system |
| CN110381642A (en) * | 2019-08-07 | 2019-10-25 | 深圳市智童乐慧科技有限公司 | A kind of splicing lamp |
| CN110471882A (en) * | 2019-08-22 | 2019-11-19 | 矽恩微电子(厦门)有限公司 | A kind of monobus telecommunication circuit and method |
| CN111319555B (en) * | 2020-04-10 | 2024-02-06 | 广州通达汽车电气股份有限公司 | Running water lamp control system and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102421216A (en) * | 2010-09-28 | 2012-04-18 | 深圳市长运通光电技术有限公司 | LED (Light-Emitting Diode) array scanning chip, LED device and LED scanning circuit |
| CN104011783A (en) * | 2011-10-24 | 2014-08-27 | 先进模拟科技公司 | Low cost led driver with improved serial bus |
| CN104517569A (en) * | 2014-12-15 | 2015-04-15 | 深圳市明微电子股份有限公司 | Series-connection display system and data transmission method thereof |
| CN205454166U (en) * | 2016-03-11 | 2016-08-10 | 深圳市明微电子股份有限公司 | LED driver chip , LED drive circuit and LED display screen |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011097545A (en) * | 2009-11-02 | 2011-05-12 | Lyde:Llc | 1/f fluctuation signal generation circuit |
-
2016
- 2016-03-11 CN CN201610137394.4A patent/CN105657905B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102421216A (en) * | 2010-09-28 | 2012-04-18 | 深圳市长运通光电技术有限公司 | LED (Light-Emitting Diode) array scanning chip, LED device and LED scanning circuit |
| CN104011783A (en) * | 2011-10-24 | 2014-08-27 | 先进模拟科技公司 | Low cost led driver with improved serial bus |
| CN104517569A (en) * | 2014-12-15 | 2015-04-15 | 深圳市明微电子股份有限公司 | Series-connection display system and data transmission method thereof |
| CN205454166U (en) * | 2016-03-11 | 2016-08-10 | 深圳市明微电子股份有限公司 | LED driver chip , LED drive circuit and LED display screen |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105657905A (en) | 2016-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105657905B (en) | A kind of LED drive chip, LED drive circuit and LED display | |
| CN104145242B (en) | Cable with fade and hot plug features | |
| CN102891813B (en) | Support the ethernet port framework of multiple transmission mode | |
| CN203644371U (en) | LED display unit panel and LED display screen | |
| CN103857106B (en) | Led drive circuit and control system | |
| CN102142229A (en) | LED (Light Emitting Diode) special-shaped control device and LED special-shaped control system | |
| CN203596162U (en) | Energy-saving LED display screen | |
| CN205454166U (en) | LED driver chip , LED drive circuit and LED display screen | |
| CN204029305U (en) | A kind of bicycle Hot Wheels based on Bluetooth transmission and system | |
| CN202976787U (en) | Multi-format signal conversion device and display equipment | |
| CN208938622U (en) | A kind of LED dot matrix driving chip | |
| CN204244525U (en) | A kind of backlight circuit and keyboard | |
| CN109410830A (en) | A kind of LED display driving circuit | |
| CN103247265A (en) | Parallel latch LED (light emitting diode) screen circuit | |
| CN203325412U (en) | LED full-color display screen control circuit | |
| CN204257173U (en) | Colored segment code type digital tube display device | |
| CN206685098U (en) | A kind of control system of display screen | |
| CN107301838A (en) | The drive circuit of light-emitting diode display | |
| CN207115973U (en) | A kind of drive system of LED three dimensional displays | |
| CN206602636U (en) | A kind of Baffle Box of Bluetooth circuit | |
| CN202171933U (en) | LED (light-emitting diode) split-join display device with super high resolution rate | |
| CN205508356U (en) | LED display driver unit and LED display module | |
| CN111163559B (en) | Data processing circuit and light emitting diode driving circuit | |
| CN203225080U (en) | A display circuit used for an instrument display panel | |
| CN207833886U (en) | A kind of distribution type LED control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |