CN105657905A - LED driving chip, LED driving circuit and LED display screen - Google Patents
LED driving chip, LED driving circuit and LED display screen Download PDFInfo
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- CN105657905A CN105657905A CN201610137394.4A CN201610137394A CN105657905A CN 105657905 A CN105657905 A CN 105657905A CN 201610137394 A CN201610137394 A CN 201610137394A CN 105657905 A CN105657905 A CN 105657905A
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- 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
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Abstract
The invention belongs to the field of LED driving control, and provides an LED driving chip, an LED driving circuit and an LED display screen. The LED driving circuit comprises multiple cascaded LED driving chips, and each LED driving chip comprises a serial-shift unit, a driving control unit and a shaping output unit; each serial-shift unit receives an external control signal in a single-line communication mode and intercepts control data, corresponding to the LED driving chip, in the control signal, the driving control units conduct driving control on an LED lamp according to the control data, and the shaping output units shape rest data in the control signal and output the shaped data. According to the LED driving chip, the LED driving circuit and the LED display screen, driving control over the LED lamp in the LED driving circuit can be achieved only using one kind of chips, the circuit structure is simplified, the maintenance cost is reduced, driving control is conducted on the LED driving circuit in the single-line communication mode, a communication protocol is simplified, and the cascading error is reduced.
Description
Technical field
The invention belongs to LED and drive control field, relate in particular to a kind of LED and drive chip, LED to driveCircuit and LED display.
Background technology
LED (LightEmittingDiode) display screen is a kind of by controlling the display mode of LED, comesThe display screen of the various information such as display text, figure, image, animation, market, video, video signal.
Traditional LED display drive scheme by adopt LED drive chip 595 and some otherCompanion chip is realized. As the monochromatic module of a P10 needs 16 SM74HC595 chips, 4MW4953 chip, 1 SM74HC245 chip and 1 SM74HC138 chip, these 4 typesChip portfolio gets up, and jointly realizes the driving control to LED display, as shown in Figure 1, and outside controlSignal (comprising row control signal A/B, data-signal SER and system control signal SCK/RCK) processChip SM74HC245 exports after amplifying shaping, and wherein, row control signal A/B is by chip SM74HC138After decoding, the Push And Release of control chip MW4953 is realized the row of LED display is controlled; System control letterNumber SCK/RCK mono-tunnel is for control chip 595, and another road is for next stage cascade control; And data-signalSER data-signal SER as subordinate after 595 chip serial transfer of multiple series connection inputs. Thus canKnow, in the time LED display being driven to control, traditional scheme is the communication protocol that adopts multi-thread control,Respectively switch, the brightness etc. of LED display are controlled by multiple control ports.
The chip type that traditional LED display drive scheme is used is more, and circuit complexity is given trouble huntingCause great inconvenience, increased maintenance cost; And traditional LED display drive scheme adopts multi-threadControl mode, control protocol complexity, display refresher rate is low, and signal easily disturbs, and there is no current classRegulatory function.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of LED drive circuit, is intended to solve traditional LEDThe chip type that display screen drive scheme is used is more, and circuit complexity causes barrier maintenance inconvenience, and traditionLED display drive scheme control protocol complexity, signal easily disturbs, the problem of the functions such as no current adjusting.
The embodiment of the present invention is achieved in that a kind of LED drives chip, for driving LED lamp, and instituteStating LED drives chip to comprise:
Receive outside control signal in the mode of single line communication, and to driving with this LED in described control signalThe serial shift unit that the moving corresponding control data of chip intercept;
Be connected the described control that described serial shift unit is intercepted with the output of described serial shift unitThe memory cell that data are preserved;
Be connected the described control number intercepting according to described serial shift unit with the output of described memory cellAccording to corresponding LED lamp being driven to the driving control unit of controlling;
Be connected with the output of described serial shift unit, by described control signal through described serial shift listRemaining data after unit intercepts carries out the shaping output unit of shaping output.
Another object of the embodiment of the present invention is also to provide a kind of LED drive circuit, and described LED drivesCircuit is connected with LED display module, and described LED display module comprises multiple LED lamps, it is characterized in that,Described LED drive circuit comprises that the LED of multiple cascades drives chip, and described LED drives chip to comprise:
Receive outside control signal in the mode of single line communication, and to driving with this LED in described control signalThe serial shift unit that the moving corresponding control data of chip intercept;
Be connected the described control that described serial shift unit is intercepted with the output of described serial shift unitThe memory cell that data are preserved;
Be connected the described control number intercepting according to described serial shift unit with the output of described memory cellAccording to described multiple LED lamps being driven to the driving control unit of controlling;
Be connected with the output of described serial shift unit, by described control signal through described serial shift listRemaining data after unit intercepts carries out shaping and exports rear class LED to driving the shaping output unit of chip;
Described remaining data comprises: drive the corresponding control data of chip with each LED of rear class respectively,And drive the electric current that the output current of chip regulates to regulate data to all LED;
First LED drives the control that the input of the serial shift unit of chip is described LED drive circuitSignal input part processed.
Further, the form of described control signal is: RESET signal+first LED driving chipControl the control data that data+the second LED drives chip+... the control of the+the N LED driving chipData+electric current regulates data, and the data high position in described control signal is front, and low level is rear.
Further, each LED drives chip to connect 4 groups of LED lamps, and the negative electrode of first group of LED lamp connects altogetherThe first control pin that drives chip in described LED, the negative electrode of second group of LED lamp is connected to altogether described LED and drivesThe second control pin of moving chip, the negative electrode of the 3rd group of LED lamp is connected to altogether described LED and drives the 3rd of chipControl pin, the negative electrode of the 4th group of LED lamp is connected to the 4th control pin of described LED driving chip altogether.
Further, the number of every group of LED lamp is 8, and the anode of every group of LED lamp meets respectively described LEDDrive chip the first switch pin, second switch pin, the 3rd switch pin, the 4th switch pin, the 5th switch pin,The 6th switch pin, minion are closed pin and the 8th switch pin.
Further, it is 32Bit that each LED drives the corresponding control data of chip, each LED lampThe control data of corresponding 1Bit, the memory capacity of the control data memory module in described memory cell is4Byte, the control data corresponding stored of described 32Bit is in the control data memory module of described 4Byte.
Further, be low level when described LED drives the first control pin of chip, described LED drivesWhen the second control pin, the 3rd control pin and the 4th control pin of chip is high-impedance state, described first group of LEDLamp shows according to the control data of a Byte who stores in described control data memory module; When describedIt is low level that LED drives the second control pin of chip, and described LED drives first control pin, the of chipWhen three control pins and the 4th control pin are high-impedance state, described second group of LED lamp deposited according to described control dataThe control data of the 2nd Byte storing in storage module show; When described LED drives the 3rd of chipControl pin is low level, and described LED drives the first control pin, the second control pin and the 4th control pin of chipWhile being high-impedance state, described the 3rd group of LED lamp is according to the store in described control data memory module the 3rdThe control data of Byte show; Be low level when described LED drives the 4th control pin of chip, instituteWhen stating LED and driving the first control pin, the second control pin and the 3rd control pin of chip to be high-impedance state, described inThe 4th group of LED lamp carries out according to the control data of the 4th Byte storing in described control data memory moduleShow.
Further, the number of every group of LED lamp is 16, described in the anode of every group of LED lamp connects respectivelyLED drives the first switch pin, second switch pin, the 3rd switch pin, the 4th switch pin, the 5th of chip to openClose pin, the 6th switch pin, minion and close pin, the 8th switch pin, the 9th switch pin, the tenth switch pin, the11 switch pin, twelvemo close pin, the 13 switch pin, the 14 switch pin, the 15 switch pin andSixteenmo closes pin.
Further, it is 64Bit that each LED drives the corresponding control data of chip, each LED lampThe control data of corresponding 1Bit, the memory capacity of the control data memory module in described memory cell is8Byte, the control data corresponding stored of described 64Bit is in the control data memory module of described 8Byte.
Further, be low level when described LED drives the first control pin of chip, described LED drivesWhen the second control pin, the 3rd control pin and the 4th control pin of chip is high-impedance state, described first group of LEDLamp carries out according to the control data of a Byte who stores in described control data memory module and the 2nd ByteShow; Be low level when described LED drives the second control pin of chip, described LED drives the of chipWhen one control pin, the 3rd control pin and the 4th control pin are high-impedance state, described second group of LED lamp is according to instituteState and control the 3rd Byte that stores in data memory module and the control data of the 4th Byte show; WhenIt is low level that described LED drives the 3rd control pin of chip, described LED drive chip the first control pin,When the second control pin and the 4th control pin are high-impedance state, described the 3rd group of LED lamp is according to described control dataThe 5th Byte storing in memory module and the control data of the 6th Byte show; When described LED drivesThe 4th control pin of moving chip is low level, and described LED drives the first control pin, second control pin of chipWhile being high-impedance state with the 3rd control pin, described the 4th group of LED lamp is according in described control data memory moduleThe 7th Byte of storage and the control data of the 8th Byte show.
Another object of the embodiment of the present invention is also to provide a kind of LED display, described LED displayComprise LED drive circuit described above.
In an embodiment of the present invention, described LED drive circuit comprises that the LED of multiple cascades drives chip,Described LED drives chip to comprise: serial shift unit, driving control unit and shaping output unit; DescribedSerial shift unit receives outside control signal in the mode of single line communication, and in described control signal withThis LED drives the corresponding control data of chip to intercept, and described driving control unit is according to described controlData drive control to LED lamp, described shaping output unit by described control signal through intercept afterAfter remaining data shaping, export. In an embodiment of the present invention, described LED drive circuit has only been used a kind of coreSheet can be realized the driving control to LED lamp, has simplified circuit structure, has reduced maintenance cost, and described inLED drive circuit drives control by the mode of single line communication, has simplified communication protocol, has reduced levelConnection error, electric current in control signal regulates data can be directly the output current of chip to be carried out to different bracketsRegulate.
Brief description of the drawings
Fig. 1 is the modular structure figure of the LED drive circuit that provides of prior art;
Fig. 2 is the cut-away view that the LED that provides of the embodiment of the present invention drives chip;
Fig. 3 is the modular structure figure of the LED drive circuit that provides of the embodiment of the present invention;
Fig. 4 is the signal that the each LED of inputing to of providing of the embodiment of the present invention drives the control signal of chipFigure;
Fig. 5 is the form schematic diagram of the control signal that provides of the embodiment of the present invention;
Fig. 6 is the peripheral circuit diagram that the LED that provides of the embodiment of the present invention drives chip;
Fig. 7 is the form schematic diagram of the control signal that provides of another embodiment of the present invention;
Fig. 8 is the peripheral circuit diagram that the LED that provides of another embodiment of the present invention drives chip;
Fig. 9 is the sequential chart that the LED that provides of the embodiment of the present invention drives each control pin of chip.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and realityExecute example, the present invention is further elaborated. Only should be appreciated that specific embodiment described hereinOnly, in order to explain the present invention, be not intended to limit the present invention.
Embodiment mono-:
First embodiment of the invention provides a kind of LED to drive chip.
Fig. 2 shows LED that first embodiment of the invention provides and drives the cut-away view of chip, for justIn explanation, only show the part relevant to the embodiment of the present invention.
A kind of LED drives chip U1, and for driving LED lamp, LED drives chip U1 to comprise:
Receive outside control signal in the mode of single line communication, and to driving with this LED in described control signalThe serial shift unit 201 that the moving corresponding control data of chip intercept. In the present embodiment, LEDDrive chip U1 to receive outside control signal by single port Din, simplified control protocol, outsideControl signal comprise with this LED and drive the corresponding control data of chip, also comprise other control numberAccording to.
Be connected the described control intercepting according to serial shift unit 201 with the output of serial shift unit 201Data processed drive the driving control unit 203 of controlling to corresponding LED lamp.
Be connected with the output of serial shift unit 201, by described control signal through serial shift unit 201Remaining data after intercepting carries out the shaping output unit 204 of shaping output.
In the present embodiment, shaping output unit 204 by described control signal through serial shift unit 201Remaining data after intercepting carries out shaping, by the control number of representative data in remaining data 1 and representative data 0According to through processing, export data 1 or the data 0 of corresponding standard.
As one embodiment of the invention, LED drives chip U1 also to comprise:
Be connected between serial shift unit 201 and driving control unit 203, by serial shift unit 201The memory cell 202 that the described control data that intercept are preserved. In the present embodiment, memory cell 202Can be formed by multiple registers.
Embodiment bis-:
Second embodiment of the invention provides a kind of LED drive circuit.
Fig. 3 shows the modular structure figure of the LED drive circuit that the embodiment of the present invention provides, for the ease of sayingBright, only show the part relevant to the embodiment of the present invention.
A kind of LED drive circuit, is connected with LED display module 2, and LED display module 2 comprises multipleLED lamp, described LED drive circuit comprises that the LED of multiple cascades drives chip U1. LED drives coreSheet U1 comprises:
Receive outside control signal CON in the mode of single line communication, and in control signal CON with shouldThe serial shift unit 201 that LED drives the corresponding control data of chip to intercept.
In the present embodiment, described control signal CON comprises relative with each LED driving chip U1The control data (comprise and show data and brightness data) of answering, and all LED are driven to the defeated of chipGo out the current data that electric current regulates.
Be connected the described control intercepting according to serial shift unit 201 with the output of serial shift unit 201Data processed drive the driving control unit 203 of controlling to described multiple LED lamps.
Be connected with the output of serial shift unit 201, by described control signal through serial shift unit 201Remaining data after intercepting carries out shaping and exports rear class LED to driving the shaping output unit 204 of chip.
Wherein, described remaining data comprises: drive the corresponding control of chip with each LED of rear class respectivelyData, and drive the electric current that the output current of chip regulates to regulate data to all LED.
As one embodiment of the invention, LED drives chip U1 also to comprise:
Be connected between serial shift unit 201 and driving control unit 203, by serial shift unit 201The memory cell 202 that the described control data that intercept are preserved.
Fig. 3 drives chip U1 to describe as example taking the LED of three cascades, certainly can be according to realityThe LED of increase in demand or minimizing cascade drives the number of chip. In Fig. 3, first LED drives coreThe control signal input that the input Din of sheet 101 is described LED drive circuit, second LED drivesThe input Din of moving chip 102 meets the output Dout of first LED driving chip 101, the 3rdLED drives the input Din of chip 103 to meet the output Dout of second LED driving chip 102.
As one embodiment of the invention, first LED drives the input of the serial shift unit 201 of chipEnd is the control signal input of described LED drive circuit, and last LED drives the shaping of chip defeatedThe output that the output that goes out unit 204 is described LED drive circuit. In the present embodiment, firstLED drives the control that the input of the serial shift unit 201 of chip 101 is described LED drive circuitSignal input part, the 3rd LED drives described in the output of the shaping output unit 204 of chip 103 isThe output of LED drive circuit.
Fig. 4 shows the form schematic diagram of the control signal that the embodiment of the present invention provides, for convenience of explanation,Only show the part relevant to the embodiment of the present invention.
As one embodiment of the invention, the form of described control signal is: RESET signal+first LEDDrive control data+the second LED of chip drive the control data of chip+... the+the N LED drivingControl data+the electric current of chip regulates data.
In the present embodiment, comprise that with described LED drive circuit the LED of three cascades drives chip U1For example, input to first LED and drive the control signal of chip 101 to be: RESET signal+firstLED drives control data+the second LED of chip to drive control data+three LED of chip to driveControl data+the electric current of chip regulates data. First LED drives the serial shift unit 201 of chip 101By its input, Din receives described control signal, and by control corresponding thereto in described control signalAfter intercepting, data (being the control data that first LED drives chip) export shaping output unit to204, shaping output unit 204 will export second LED to after the remaining data shaping in described control signalDrive chip 102, described remaining data comprises: second LED drives control data+three LED of chipDrive the control data+electric current of chip to regulate data. Second control that LED drives chip 102 to receiveSignal is: second LED of RESET+ drives control data+three LED of chip to drive the control of chipData processed+electric current regulates data, and second LED drives the serial shift unit 201 of chip 102 by itInput Din receives described control signal, and by control data corresponding thereto in described control signal (Second LED drives the control data of chip) export shaping output unit 204 to, shaping after interceptingOutput unit 204 drives chip by exporting the 3rd LED after the remaining data shaping in described control signal to103, described remaining data comprises: the 3rd LED drives the control data+electric current of chip to regulate data. TheThe control signal that three LED drive chip 103 to receive is: RESET+ the 3rd LED drives chipControl data+electric current and regulate data, the 3rd LED drives the serial shift unit 201 of chip 103 to pass throughIts input Din receives described control signal, and by control data corresponding thereto in described control signal(i.e. the control data of the 3rd LED driving chip) export shaping output unit 204 to after intercepting,Shaping output unit 204 will be exported after the remaining data shaping in described control signal, described remaining data bagDraw together: electric current regulates data.
The LED that Fig. 6 shows the embodiment of the present invention to be provided drives the peripheral circuit diagram of chip, for the ease of sayingBright, only show the part relevant to the embodiment of the present invention.
As one embodiment of the invention, each LED drives chip U1 to connect 4 groups of LED lamps, first groupThe negative electrode of LED lamp is connected to the first control pin C0 of LED driving chip U1, the moon of second group of LED lamp altogetherBe connected to extremely altogether the second control pin C1 that LED drives chip U1, the negative electrode of the 3rd group of LED lamp is connected to LED altogetherDrive the 3rd control pin C2 of chip U1, the negative electrode of the 4th group of LED lamp is connected to altogether LED and drives chip U1The 4th control pin C3.
As one embodiment of the invention, the number of every group of LED lamp is 8, the anode of every group of LED lampConnect respectively the first switch pin S0, second switch pin S1 that LED drives chip U1, the 3rd switch pin S2,The 4th switch pin S3, the 5th switch pin S4, the 6th switch pin S5, minion are closed pin S6 and the 8th switch pinS7。
As one embodiment of the invention, each LED drives the corresponding control data of chip U1 to be32Bit, the control data of the corresponding 1Bit of each LED lamp, the control data storage mould in memory cell 202The memory capacity of piece is 4Byte, and the control data corresponding stored of described 32Bit is in the control number of described 4ByteIn memory module.
Showing of the control signal of what Fig. 5 showed that the embodiment of the present invention provides input to each LED drives chipIntention, for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
As one embodiment of the invention, the data high position in described control signal is front, and low level is rear. ?In the present embodiment, when the number of the every group of LED lamp that connects is 8, each LDE drives chip to connect 32When LED lamp, the control signal that inputs to each LED driving chip comprises control data (Fig. 5 of 32BitIn b31～b0) and the electric current of 4Bit regulate data (B3～B0 in Fig. 5).
As one embodiment of the invention, be low level when LED drives the first control pin C0 of chip U1,LED drives the second control pin C1, the 3rd control pin C2 and the 4th control pin C3 of chip U1 to be heightWhen resistance state, first group of LED lamp is according to the control data of controlling a Byte who stores in data memory moduleShow; Be low level when LED drives the second control pin C1 of chip U1, LED drives chip U1The first control pin C0, the 3rd control pin C2 and the 4th control pin C3 while being high-impedance state, second group of LEDLamp shows according to the control data of controlling the 2nd Byte storing in data memory module; When LED drivesThe 3rd control pin C2 of moving chip U1 is low level, LED drive chip U1 the first control pin C0,When the second control pin C1 and the 4th control pin C3 are high-impedance state, the 3rd group of LED lamp is according to controlling dataThe control data of the 3rd Byte storing in memory module show; When LED drives the 4th of chip U1Control pin C3 is low level, LED drive chip U1 the first control pin C0, the second control pin C1 andWhen the 3rd control pin C2 is high-impedance state, the 4th group of LED lamp stored in data memory module according to controllingThe control data of the 4th Byte show. First group of LED lamp, second group of LED lamp, the 3rd group of LEDLamp and the 4th group of LED lamp show one by one, and formed a display cycle, display frequency is up to 1KHz.
For example, be 00001111 if control the control data of a Byte who stores in data memory module,Be low level when LED drives the first control pin C0 of chip U1, LED drives the second control of chip U2When pin C1 processed, the 3rd control pin C2 and the 4th control pin C3 are high-impedance state, first group of LED lamp basisThe control data 00001111 of the one Byte show, 1 represents that the anode of LED lamp is high-impedance state, LEDLamp is bright, and 0 represents that the anode of LED lamp is low level, and LED lamp does not work.
The LED that Fig. 9 shows the embodiment of the present invention to be provided drives the sequential chart of each control pin of chip, forBe convenient to explanation, only show the part relevant to the embodiment of the present invention.
As one embodiment of the invention, LED drives the first control pin C0, the second control pin of chip U1C1, the 3rd control pin C2 and the 4th control pin C3 carry out loop control according to sequential chart as shown in Figure 9.
Fig. 8 shows LED that another embodiment of the present invention provides and drives the peripheral circuit diagram of chip, for justIn explanation, only show the part relevant to the embodiment of the present invention.
As another embodiment of the present invention, the number of every group of LED lamp is 16, the sun of every group of LED lampThe utmost point connect respectively the first switch pin S0, second switch pin S1 that LED drives chip U1, the 3rd switch pin S2,The 4th switch pin S3, the 5th switch pin S4, the 6th switch pin S5, minion are closed pin S6, the 8th switch pinS7, the 9th switch pin S8, the tenth switch pin S9, the 11 switch pin S10, twelvemo close pin S11,The 13 switch pin S12, the 14 switch pin S13, the 15 switch pin S14 and sixteenmo close pin S15.
As another embodiment of the present invention, each LED drives the corresponding control data of chip to be64Bit, the control data of the corresponding 1Bit of each LED lamp, the control data storage mould in memory cell 202The memory capacity of piece is 8Byte, and the control data corresponding stored of described 64Bit is in the control number of described 8ByteIn memory module.
Fig. 7 shows the control signal that inputs to each LED driving chip that another embodiment of the present invention providesSchematic diagram, for convenience of explanation, only show the part relevant to the embodiment of the present invention.
As one embodiment of the invention, the data high position in described control signal is front, and low level is rear. ?In the present embodiment, in the time that the number of the every group of LED lamp that connects is 16, each LDE drives chip to connectWhen 64 LED lamps, the control signal that inputs to each LED driving chip comprises the control data of 64BitThe electric current of (b63～b0 in Fig. 7) and 4Bit regulates data (B3～B0 in Fig. 7).
As another embodiment of the present invention, be low electricity when LED drives the first control pin C0 of chip U1Flat, LED drives the second control pin C1, the 3rd control pin C2 and the 4th control pin C3 of chip U1 equalDuring for high-impedance state, described first group of LED lamp is according to a Byte who stores in described control data memory moduleShow with the control data of the 2nd Byte; Be low when LED drives the second control pin C1 of chip U1Level, LED drives the first control pin C0, the 3rd control pin C2 and the 4th control pin C3 of chip U1While being high-impedance state, described second group of LED lamp is according to the store in described control data memory module the 3rdThe control data of Byte and the 4th Byte show; As the 3rd control pin C2 of LED driving chip U1For low level, LED drives the first control pin C0, the second control pin C1 and the 4th control pin of chip U1When C3 is high-impedance state, described the 3rd group of LED lamp is according to store in described control data memory moduleThe control data of five Byte and the 6th Byte show; When the 4th control pin of LED driving chip U1C3 is low level, and LED drives the first control pin C0, the second control pin C1 and the 3rd of chip U1 to controlWhen pin C2 is high-impedance state, described the 4th group of LED lamp is according to storing in described control data memory moduleThe control data of the 7th Byte and the 8th Byte show.
For example, a Byte who stores in data memory module if control and the control data of the 2nd Byte are0000111100001111, be low level when LED drives the first control pin C0 of chip U1, LED drivesWhen the second control pin C1, the 3rd control pin C2 of moving chip U2 and the 4th control pin C3 are high-impedance state,First group of LED lamp carries out according to the control data 0000111100001111 of a Byte and the 2nd ByteShow, 1 represents that the anode of LED lamp is high-impedance state, and LED lamp is bright, and 0 represents that the anode of LED lamp is lowLevel, LED lamp does not work.
As one embodiment of the invention, described electric current regulates data to comprise 4Bit, can drive each LEDThe electric current of chip U1 carries out the adjusting of 16 different brackets, and the electric current of described 4Bit regulates data corresponding respectivelySize of current as shown in Table 1:
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 tri-:
Third embodiment of the invention provides a kind of LED display, and described LED display comprises that second is realExecute the LED drive circuit that example provides.
In an embodiment of the present invention, described LED drive circuit comprises that the LED of multiple cascades drives chip,Described LED drives chip to comprise: serial shift unit, driving control unit and shaping output unit; DescribedSerial shift unit receives outside control signal in the mode of single line communication, and in described control signal withThis LED drives the corresponding control data of chip to intercept, and described driving control unit is according to described controlData drive control to LED lamp, described shaping output unit by described control signal through intercept afterAfter remaining data shaping, export. In an embodiment of the present invention, described LED drive circuit has only been used a kind of coreSheet can be realized the driving control to LED lamp, has simplified circuit structure, has reduced maintenance cost, and described inLED drive circuit drives control by the mode of single line communication, has simplified communication protocol, has reduced levelConnection error, electric current in control signal regulates data can be directly the output current of chip to be carried out to different bracketsRegulate.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, not all at thisAny amendment of doing within bright spirit and principle, be equal to and replace and improvement etc., all should be included in the present inventionProtection domain within.
Claims (11)
1. LED drives a chip, for driving LED lamp, it is characterized in that, described LED drivesChip comprises:
Receive outside control signal in the mode of single line communication, and to driving with this LED in described control signalThe serial shift unit that the moving corresponding control data of chip intercept;
Be connected the described control that described serial shift unit is intercepted with the output of described serial shift unitThe memory cell that data are preserved;
Be connected the described control number intercepting according to described serial shift unit with the output of described memory cellAccording to corresponding LED lamp being driven to the driving control unit of controlling;
Be connected with the output of described serial shift unit, by described control signal through described serial shift listRemaining data after unit intercepts carries out the shaping output unit of shaping output.
2. a LED drive circuit, is connected with LED display module, and described LED display module comprisesMultiple LED lamps, is characterized in that, described LED drive circuit comprises that the LED of multiple cascades drives chip,Described LED drives chip to comprise:
Receive outside control signal in the mode of single line communication, and to driving with this LED in described control signalThe serial shift unit that the moving corresponding control data of chip intercept;
Be connected the described control that described serial shift unit is intercepted with the output of described serial shift unitThe memory cell that data are preserved;
Be connected the described control number intercepting according to described serial shift unit with the output of described memory cellAccording to described multiple LED lamps being driven to the driving control unit of controlling;
Be connected with the output of described serial shift unit, by described control signal through described serial shift listRemaining data after unit intercepts carries out shaping and exports rear class LED to driving the shaping output unit of chip;
Described remaining data comprises: drive the corresponding control data of chip with each LED of rear class respectively,And drive the electric current that the output current of chip regulates to regulate data to all LED;
First LED drives the control that the input of the serial shift unit of chip is described LED drive circuitSignal input part processed.
3. LED drive circuit as claimed in claim 2, is characterized in that, the lattice of described control signalFormula is: control data+the second of RESET signal+first a LED driving chip LED driving chipControl data+... the+the N LED drives control data+electric current of chip to regulate data, described control letterA data high position in number is front, and low level is rear.
4. LED drive circuit as claimed in claim 3, is characterized in that, each LED drives chipConnect 4 groups of LED lamps, the negative electrode of first group of LED lamp is connected to the first control pin of described LED driving chip altogether,The negative electrode of second group of LED lamp is connected to the second control pin of described LED driving chip, the 3rd group of LED lamp altogetherNegative electrode be connected to altogether described LED and drive the 3rd control pin of chip, the negative electrode of the 4th group of LED lamp is connected to altogetherDescribed LED drives the 4th control pin of chip.
5. LED drive circuit as claimed in claim 4, is characterized in that, the number of every group of LED lampBe 8, the anode of every group of LED lamp meets respectively described LED and drives the first switch pin, second of chip to openClose pin, the 3rd switch pin, the 4th switch pin, the 5th switch pin, the 6th switch pin, minion and close pin and theEight switch pin.
6. LED drive circuit as claimed in claim 5, is characterized in that, each LED drives coreThe corresponding control data of sheet are 32Bit, the control data of the corresponding 1Bit of each LED lamp, described storage listThe memory capacity of the control data memory module in unit is 4Byte, the control data corresponding stored of described 32BitIn the control data memory module of described 4Byte.
7. LED drive circuit as claimed in claim 6, is characterized in that, when described LED drives coreThe first control pin of sheet is low level, and described LED drives second control pin, the 3rd control pin and the of chipWhen four control pins are high-impedance state, described first group of LED lamp is according to storing in described control data memory moduleThe control data of a Byte show; Be low electricity when described LED drives the second control pin of chipFlat, when described LED drives the first control pin, the 3rd control pin and the 4th control pin of chip to be high-impedance state,Described second group of LED lamp is according to the control data of the 2nd Byte storing in described control data memory moduleShow; Be low level when described LED drives the 3rd control pin of chip, described LED drives chipThe first control pin, the second control pin and the 4th control pin while being high-impedance state, described the 3rd group of LED lamp rootControl data according to the 3rd Byte storing in described control data memory module show; As described LEDDriving the 4th control pin of chip is low level, and described LED drives first control pin, second of chip to controlWhen pin and the 3rd control pin are high-impedance state, described the 4th group of LED lamp is according to described control data memory moduleThe control data of the 4th Byte of middle storage show.
8. LED drive circuit as claimed in claim 4, is characterized in that, the number of every group of LED lampBe 16, the anode of every group of LED lamp meets respectively described LED and drives the first switch pin, second of chip to openClose pin, the 3rd switch pin, the 4th switch pin, the 5th switch pin, the 6th switch pin, minion and close pin, theEight switch pin, the 9th switch pin, the tenth switch pin, the 11 switch pin, twelvemo are closed pin, the 13Switch pin, the 14 switch pin, the 15 switch pin and sixteenmo close pin.
9. LED drive circuit as claimed in claim 8, is characterized in that, each LED drives coreThe corresponding control data of sheet are 64Bit, the control data of the corresponding 1Bit of each LED lamp, described storage listThe memory capacity of the control data memory module in unit is 8Byte, the control data corresponding stored of described 64BitIn the control data memory module of described 8Byte.
10. LED drive circuit as claimed in claim 9, is characterized in that, when described LED drivesThe first control pin of chip is low level, described LED drive chip the second control pin, the 3rd control pin andWhen the 4th control pin is high-impedance state, described first group of LED lamp is according to depositing in described control data memory moduleThe one Byte of storage and the control data of the 2nd Byte show; When described LED drives second of chipControl pin is low level, and described LED drives the first control pin, the 3rd control pin and the 4th control pin of chipWhile being high-impedance state, described second group of LED lamp is according to the store in described control data memory module the 3rdThe control data of Byte and the 4th Byte show; When described LED drives the 3rd control pin of chip beLow level, described LED drives the first control pin, the second control pin and the 4th control pin of chip to be high resistantWhen state, described the 3rd group of LED lamp is according to the 5th Byte storing in described control data memory module andThe control data of six Byte show; Be low level when described LED drives the 4th control pin of chip,When described LED drives the first control pin, the second control pin and the 3rd control pin of chip to be high-impedance state, instituteState the 4th group of LED lamp according to the 7th Byte storing in described control data memory module and the 8th ByteControlling data shows.
11. 1 kinds of LED displays, is characterized in that, described LED display comprises as claim 2～10LED drive circuit described in any one.
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