CN205454166U - LED driver chip , LED drive circuit and LED display screen - Google Patents
LED driver chip , LED drive circuit and LED display screen Download PDFInfo
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- CN205454166U CN205454166U CN201620185488.4U CN201620185488U CN205454166U CN 205454166 U CN205454166 U CN 205454166U CN 201620185488 U CN201620185488 U CN 201620185488U CN 205454166 U CN205454166 U CN 205454166U
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Abstract
The utility model belongs to the LED drive control field provides a LED driver chip, LED drive circuit and LED display screen. LED drive circuit includes a plurality of cascaded LED driver chip, and LED driver chip includes: serial shift unit, drive control unit and plastic output unit, outside control signal is received with the mode of single line communication to the serial shift unit, and right carry out intercepting, drive control unit basis with the corresponding control data of this LED driver chip among the control signal control data carries out drive control to the LED lamp, and plastic output unit will remainder among the control signal is exported after according to the plastic. The utility model discloses in, LED drive circuit has only used a chip can realize having simplified circuit structure to the drive control of LED lamp, has reduced cost of maintenance, and LED drive circuit carries out drive control through the mode of single line communication, has simplified communication protocol, has reduced and has cascaded the error.
Description
Technical field
This utility model belongs to LED and drives control field, particularly relates to a kind of LED drive chip, LED drive circuit and LED display.
Background technology
LED (LightEmittingDiode) display screen is a kind of display mode by controlling LED, shows the display screen of the various information such as word, figure, image, animation, market, video, video signal.
Traditional LED display drive scheme is that other companion chip realizes with some by employing LED drive chip 595.Monochromatic module such as one piece of P10 needs 16 SM74HC595 chips, 4 MW4953 chips, 1 SM74HC245 chip and 1 SM74HC138 chip, the chip portfolio of this 4 type gets up, the driving of LED display is controlled by common realization, as shown in Figure 1, outside control signal (includes row control signal A/B, data signal SER and system control signal SCK/RCK) export after chip SM74HC245 amplifies shaping, wherein, row control signal A/B realizes going LED display control by the Push And Release of control chip MW4953 after chip SM74HC138 decoding；System control signal SCK/RCK mono-tunnel is used for control chip 595, and another road is used for next stage cascade Mach-Zehnder interferometer；And data signal SER after 595 chip serial transfer of multiple series connection as subordinate data signal SER input.It follows that when being driven LED display controlling, traditional scheme is the communication protocol using many line traffic controls, i.e. respectively the switch of LED display, brightness etc. are controlled by multiple control ports.
The chip type that traditional LED display drive scheme is used is more, and circuit is complicated, causes great inconvenience to trouble shooting, adds maintenance cost；And traditional LED display drive scheme uses multi-thread control mode, control protocol is complicated, and display refresher rate is low, and signal easily disturbs, and does not has current class regulatory function.
Utility model content
The purpose of this utility model embodiment is to provide a kind of LED drive circuit, aim to solve the problem that the chip type that traditional LED display drive scheme is used is more, circuit is complicated, cause barrier maintenance inconvenience, and traditional LED display drive scheme control protocol complexity, signal easily disturbs, the problem of the functions such as no current regulation.
This utility model embodiment is achieved in that a kind of LED drive chip, is used for driving LED, described LED drive chip to include:
The control signal of outside, and the serial shift unit that control data corresponding with this LED drive chip in described control signal are intercepted is received in the way of single line communication；
It is connected with the outfan of described serial shift unit, the described control data that described serial shift unit intercepts are carried out the memory element preserved；
Being connected with the outfan of described memory element, the described control data intercepted according to described serial shift unit are driven the driving control unit controlled to corresponding LED；
Be connected with the outfan of described serial shift unit, by described control signal through described serial shift unit intercept after remaining data carry out shaping the shaping output unit exported.
The another object of this utility model embodiment also resides in a kind of LED drive circuit of offer, described LED drive circuit is connected with LED display module, described LED display module includes multiple LED, it is characterized in that, described LED drive circuit includes that the LED drive chip of multiple cascade, described LED drive chip include:
The control signal of outside, and the serial shift unit that control data corresponding with this LED drive chip in described control signal are intercepted is received in the way of single line communication；
It is connected with the outfan of described serial shift unit, the described control data that described serial shift unit intercepts are carried out the memory element preserved；
Being connected with the outfan of described memory element, the described control data intercepted according to described serial shift unit are driven the driving control unit controlled to the plurality of LED；
Be connected with the outfan of described serial shift unit, by described control signal through described serial shift unit intercept after remaining data carry out shaping and export the shaping output unit to rear class LED drive chip；
Described remaining data includes: control data corresponding with each LED drive chip of rear class respectively, and all of LED drive chip exports the electric current regulation data that electric current is adjusted；
The control signal input that input is described LED drive circuit of the serial shift unit of first LED drive chip.
Further, the form of described control signal is: the control data of control+the second LED drive chip of data of+the first LED drive chip of RESET signal+... the control data of+n-th LED drive chip+electric current regulation data, data in described control signal are high-order front, and low level is rear.
Further, each LED drive chip connects 4 groups of LED, the negative electrode of first group of LED is connected to the first control foot of described LED drive chip altogether, the negative electrode of second group of LED is connected to the second control foot of described LED drive chip altogether, the negative electrode of the 3rd group of LED is connected to the 3rd control foot of described LED drive chip altogether, and the negative electrode of the 4th group of LED is connected to the 4th control foot of described LED drive chip altogether.
Further, the number often organizing LED is 8, and the anode often organizing LED connects the first switch foot of described LED drive chip, second switch foot, the 3rd switch foot, the 4th switch foot, the 5th switch foot, the 6th switch foot, the 7th switch foot and the 8th switch foot respectively.
Further, the corresponding control data of each LED drive chip are 32Bit, the control data of each LED correspondence 1Bit, the memory capacity controlling data memory module in described memory element is 4Byte, and the control data correspondence of described 32Bit is stored in the control data memory module of described 4Byte.
Further, when the first control foot of described LED drive chip is low level, when second control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described first group of LED shows according to the control data of a Byte of storage in described control data memory module；When the second control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described second group of LED shows according to the control data of the 2nd Byte of storage in described control data memory module；When the 3rd control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 4th control foot are high-impedance state, described 3rd group of LED shows according to the control data of the 3rd Byte of storage in described control data memory module；When the 4th control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 3rd control foot are high-impedance state, described 4th group of LED shows according to the control data of the 4th Byte of storage in described control data memory module.
Further, the number often organizing LED is 16, often organizes that the anode of LED connects the first switch foot of described LED drive chip respectively, second switch foot, the 3rd switch foot, the 4th switch foot, the 5th switch foot, the 6th switch foot, the 7th switch foot, the 8th switch foot, the 9th switch foot, the tenth switch foot, the 11st switch foot, twelvemo are closed foot, the 13rd switch foot, the 14th switch foot, the 15th switch foot and sixteenmo and closed foot.
Further, the corresponding control data of each LED drive chip are 64Bit, the control data of each LED correspondence 1Bit, the memory capacity controlling data memory module in described memory element is 8Byte, and the control data correspondence of described 64Bit is stored in the control data memory module of described 8Byte.
Further, when the first control foot of described LED drive chip is low level, when second control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described first group of LED shows according to the control data of a Byte and the 2nd Byte of storage in described control data memory module；When the second control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described second group of LED shows according to the control data of the 3rd Byte and the 4th Byte of storage in described control data memory module；When the 3rd control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 4th control foot are high-impedance state, described 3rd group of LED shows according to the control data of the 5th Byte and the 6th Byte of storage in described control data memory module；When the 4th control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 3rd control foot are high-impedance state, described 4th group of LED shows according to the control data of the 7th Byte and the 8th Byte of storage in described control data memory module.
The another object of this utility model embodiment also resides in a kind of LED display of offer, and described LED display includes LED drive circuit described above.
In embodiment of the present utility model, described LED drive circuit includes that the LED drive chip of multiple cascade, described LED drive chip include: serial shift unit, driving control unit and shaping output unit；Described serial shift unit receives the control signal of outside in the way of single line communication, and control data corresponding with this LED drive chip in described control signal are intercepted, LED is driven controlling by described driving control unit according to described control data, and described shaping output unit exports after remaining data shaping after intercepting in described control signal.In embodiment of the present utility model, described LED drive circuit has only used a kind of chip can realize the control of the driving to LED, simplify circuit structure, reduce maintenance cost, and described LED drive circuit is driven controlling by the way of single line communication, simplifying communication protocol, reduce cascading errors, the electric current regulation data in control signal directly can carry out different grades of regulation to the output electric current of chip.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the LED drive circuit that prior art provides；
Fig. 2 is the cut-away view of the LED drive chip that this utility model embodiment provides；
Fig. 3 is the function structure chart of the LED drive circuit that this utility model embodiment provides；
Fig. 4 is the schematic diagram of the input extremely control signal of each LED drive chip that this utility model embodiment provides；
Fig. 5 is the form schematic diagram of the control signal that this utility model embodiment provides；
Fig. 6 is the peripheral circuit diagram of the LED drive chip that this utility model embodiment provides；
Fig. 7 is the form schematic diagram of the control signal that another embodiment of this utility model provides；
Fig. 8 is the peripheral circuit diagram of the LED drive chip that another embodiment of this utility model provides；
Fig. 9 is the sequential chart of each control foot of the LED drive chip that this utility model embodiment provides.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
Embodiment one:
This utility model first embodiment provides a kind of LED drive chip.
Fig. 2 shows the cut-away view of the LED drive chip that this utility model first embodiment provides, and for convenience of description, illustrate only the part relevant to this utility model embodiment.
A kind of LED drive chip U1, is used for driving LED, LED drive chip U1 to include:
The control signal of outside, and the serial shift unit 201 that control data corresponding with this LED drive chip in described control signal are intercepted is received in the way of single line communication.In the present embodiment, LED drive chip U1, by the control signal outside single port Din reception, simplifies control protocol, and outside control signal includes the control data corresponding with this LED drive chip, also includes other control data.
Being connected with the outfan of serial shift unit 201, the described control data intercepted according to serial shift unit 201 are driven the driving control unit 203 controlled to corresponding LED.
It is connected with the outfan of serial shift unit 201, remaining data after serial shift unit 201 intercepts in described control signal is carried out shaping the shaping output unit 204 exported.
In the present embodiment, remaining data after serial shift unit 201 intercepts in described control signal is carried out shaping by shaping output unit 204, the control data representing data 1 in remaining data and represent data 0 through and process, export data 1 or the data 0 of corresponding standard.
As an embodiment of the present utility model, LED drive chip U1 also includes:
Being connected to serial shift unit 201 and drive between control unit 203, the described control data intercepted by serial shift unit 201 carry out the memory element 202 preserved.In the present embodiment, memory element 202 can be made up of multiple depositors.
Embodiment two:
This utility model the second embodiment provides a kind of LED drive circuit.
Fig. 3 shows the function structure chart of the LED drive circuit that this utility model embodiment provides, and for convenience of description, illustrate only the part relevant to this utility model embodiment.
A kind of LED drive circuit, is connected with LED display module 2, and LED display module 2 includes that multiple LED, described LED drive circuit include LED drive chip U1 of multiple cascade.LED drive chip U1 includes:
Control signal CON of outside, and the serial shift unit 201 that control data corresponding with this LED drive chip in control signal CON are intercepted is received in the way of single line communication.
In the present embodiment, described control signal CON includes the control data (include video data and brightness data) corresponding with each LED drive chip U1, and all of LED drive chip is exported the current data that electric current is adjusted.
Being connected with the outfan of serial shift unit 201, the described control data intercepted according to serial shift unit 201 are driven the driving control unit 203 controlled to the plurality of LED.
It is connected with the outfan of serial shift unit 201, remaining data after serial shift unit 201 intercepts in described control signal is carried out shaping and exports the shaping output unit 204 to rear class LED drive chip.
Wherein, described remaining data includes: control data corresponding with each LED drive chip of rear class respectively, and all of LED drive chip exports the electric current regulation data that electric current is adjusted.
As an embodiment of the present utility model, LED drive chip U1 also includes:
Being connected to serial shift unit 201 and drive between control unit 203, the described control data intercepted by serial shift unit 201 carry out the memory element 202 preserved.
Fig. 3 is to illustrate as a example by LED drive chip U1 of three cascades, and the number of the LED drive chip of cascade certainly can be increased or decreased according to the actual requirements.In figure 3, the control signal input that input Din is described LED drive circuit of first LED drive chip 101, the input Din of second LED drive chip 102 meets the outfan Dout of first LED drive chip 101, and the input Din of the 3rd LED drive chip 103 meets the outfan Dout of second LED drive chip 102.
As an embodiment of the present utility model, the control signal input that input is described LED drive circuit of the serial shift unit 201 of first LED drive chip, the outfan that outfan is described LED drive circuit of the shaping output unit 204 of last LED drive chip.In the present embodiment, the control signal input that input is described LED drive circuit of the serial shift unit 201 of first LED drive chip 101, the outfan that outfan is described LED drive circuit of the shaping output unit 204 of the 3rd LED drive chip 103.
Fig. 4 shows the form schematic diagram of the control signal that this utility model embodiment provides, and for convenience of description, illustrate only the part relevant to this utility model embodiment.
As an embodiment of the present utility model, the form of described control signal is: the control data of control+the second LED drive chip of data of+the first LED drive chip of RESET signal+... the control data of+n-th LED drive chip+electric current regulation data.
In the present embodiment, including as a example by three LED drive chip U1 cascaded by described LED drive circuit, the control signal of input to first LED drive chip 101 is: the control data of+the three LED drive chip of control data of control+the second LED drive chip of data of+the first LED drive chip of RESET signal+electric current regulation data.The serial shift unit 201 of first LED drive chip 101 receives described control signal by its input Din, and export to shaping output unit 204 after control data (i.e. the control data of first LED drive chip) corresponding thereto in described control signal are intercepted, shaping output unit 204 will export after the remaining data shaping in described control signal to second LED drive chip 102, and described remaining data includes: second LED drives control data+electric current regulation data of+the three LED drive chip of control data of chip.The control signal that second LED drive chip 102 receives is: the control data of+the three LED drive chip of control data of second LED drive chip of RESET++electric current regulation data, the serial shift unit 201 of second LED drive chip 102 receives described control signal by its input Din, and export to shaping output unit 204 after control data (i.e. the control data of second LED drive chip) corresponding thereto in described control signal are intercepted, shaping output unit 204 will export after the remaining data shaping in described control signal to the 3rd LED drive chip 103, described remaining data includes: the control data of the 3rd LED drive chip+electric current regulation data.3rd control signal that LED drive chip 103 receives is: the control data of the 3rd LED drive chip of RESET++electric current regulation data, the serial shift unit 201 of the 3rd LED drive chip 103 receives described control signal by its input Din, and export to shaping output unit 204 after control data (i.e. the control data of the 3rd LED drive chip) corresponding thereto in described control signal are intercepted, shaping output unit 204 will export after the remaining data shaping in described control signal, and described remaining data includes: electric current regulation data.
Fig. 6 shows the peripheral circuit diagram of the LED drive chip that this utility model embodiment provides, and for convenience of description, illustrate only the part relevant to this utility model embodiment.
As an embodiment of the present utility model, each LED drive chip U1 connects 4 groups of LED, the negative electrode of first group of LED is connected to the first control foot C0 of LED drive chip U1 altogether, the negative electrode of second group of LED is connected to the second control foot C1 of LED drive chip U1 altogether, the negative electrode of the 3rd group of LED is connected to the 3rd control foot C2 of LED drive chip U1 altogether, and the negative electrode of the 4th group of LED is connected to the 4th control foot C3 of LED drive chip U1 altogether.
As an embodiment of the present utility model, the number often organizing LED is 8, and the anode often organizing LED meets the first switch foot S0 of LED drive chip U1, second switch foot S1, the 3rd switch foot S2, the 4th switch foot S3, the 5th switch foot S4, the 6th switch foot S5, the 7th switch foot S6 and the 8th switch foot S7 respectively.
As an embodiment of the present utility model, the corresponding control data of each LED drive chip U1 are 32Bit, the control data of each LED correspondence 1Bit, the memory capacity controlling data memory module in memory element 202 is 4Byte, and the control data correspondence of described 32Bit is stored in the control data memory module of described 4Byte.
Fig. 5 shows the schematic diagram inputting the control signal to each LED drive chip that this utility model embodiment provides, and for convenience of description, illustrate only the part relevant to this utility model embodiment.
As an embodiment of the present utility model, the data in described control signal are high-order front, and low level is rear.In the present embodiment, when the number often organizing connect LED is 8, when the most each LDE driving chip connects 32 LED, the control signal of input to each LED drive chip includes the control data (b31～b0 in Fig. 5) of 32Bit and electric current regulation data (B3～B0 in Fig. 5) of 4Bit.
As an embodiment of the present utility model, when the first control foot C0 of LED drive chip U1 is low level, when second control foot C1, the 3rd control foot C2 of LED drive chip U1 and the 4th control foot C3 are high-impedance state, first group of LED shows according to controlling the control data of a Byte of storage in data memory module；When the second control foot C1 of LED drive chip U1 is low level, when first control foot C0, the 3rd control foot C2 of LED drive chip U1 and the 4th control foot C3 are high-impedance state, second group of LED shows according to controlling the control data of the 2nd Byte of storage in data memory module；When the 3rd control foot C2 of LED drive chip U1 is low level, when first control foot C0, the second control foot C1 of LED drive chip U1 and the 4th control foot C3 are high-impedance state, the 3rd group of LED shows according to controlling the control data of the 3rd Byte of storage in data memory module；When the 4th control foot C3 of LED drive chip U1 is low level, when first control foot C0, the second control foot C1 of LED drive chip U1 and the 3rd control foot C2 are high-impedance state, the 4th group of LED shows according to controlling the control data of the 4th Byte of storage in data memory module.First group of LED, second group of LED, the 3rd group of LED and the 4th group of LED show one by one, and defining a display cycle, display frequency is up to 1KHz.
Such as, if the control data of a Byte of storage are 00001111 in control data memory module, when the first control foot C0 of LED drive chip U1 is low level, when second control foot C1, the 3rd control foot C2 of LED drive chip U2 and the 4th control foot C3 are high-impedance state, first group of LED shows according to the control data 00001111 of a Byte, and 1 anode representing LED is high-impedance state, and LED is bright, 0 anode representing LED is low level, and LED does not works.
Fig. 9 shows that each of the LED drive chip that this utility model embodiment provides controls the sequential chart of foot, for convenience of description, illustrate only the part relevant to this utility model embodiment.
As an embodiment of the present utility model, the first control foot C0 of LED drive chip U1, the second control foot C1, the 3rd control foot C2 and the 4th control foot C3 and are circulated control according to sequential chart as shown in Figure 9.
Fig. 8 shows the peripheral circuit diagram of the LED drive chip that another embodiment of this utility model provides, and for convenience of description, illustrate only the part relevant to this utility model embodiment.
As another embodiment of the present utility model, the number often organizing LED is 16, often organizes that the anode of LED meets the first switch foot S0 of LED drive chip U1 respectively, second switch foot S1, the 3rd switch foot S2, the 4th switch foot S3, the 5th switch foot S4, the 6th switch foot S5, the 7th switch foot S6, the 8th switch foot S7, the 9th switch foot S8, the tenth switch foot S9, the 11st switch foot S10, twelvemo are closed foot S11, the 13rd switch foot S12, the 14th switch foot S13, the 15th switch foot S14 and sixteenmo and closed foot S15.
As another embodiment of the present utility model, the corresponding control data of each LED drive chip are 64Bit, the control data of each LED correspondence 1Bit, the memory capacity controlling data memory module in memory element 202 is 8Byte, and the control data correspondence of described 64Bit is stored in the control data memory module of described 8Byte.
Fig. 7 shows the schematic diagram inputting the control signal to each LED drive chip that another embodiment of this utility model provides, and for convenience of description, illustrate only the part relevant to this utility model embodiment.
As an embodiment of the present utility model, the data in described control signal are high-order front, and low level is rear.In the present embodiment, when the number often organizing connect LED is 16, when the most each LDE driving chip connects 64 LED, the control signal of input to each LED drive chip includes the control data (b63～b0 in Fig. 7) of 64Bit and electric current regulation data (B3～B0 in Fig. 7) of 4Bit.
As another embodiment of the present utility model, when the first control foot C0 of LED drive chip U1 is low level, when second control foot C1, the 3rd control foot C2 of LED drive chip U1 and the 4th control foot C3 are high-impedance state, described first group of LED shows according to the control data of a Byte and the 2nd Byte of storage in described control data memory module；When the second control foot C1 of LED drive chip U1 is low level, when first control foot C0, the 3rd control foot C2 of LED drive chip U1 and the 4th control foot C3 are high-impedance state, described second group of LED shows according to the control data of the 3rd Byte and the 4th Byte of storage in described control data memory module；When the 3rd control foot C2 of LED drive chip U1 is low level, when first control foot C0, the second control foot C1 of LED drive chip U1 and the 4th control foot C3 are high-impedance state, described 3rd group of LED shows according to the control data of the 5th Byte and the 6th Byte of storage in described control data memory module；When the 4th control foot C3 of LED drive chip U1 is low level, when first control foot C0, the second control foot C1 of LED drive chip U1 and the 3rd control foot C2 are high-impedance state, described 4th group of LED shows according to the control data of the 7th Byte and the 8th Byte of storage in described control data memory module.
Such as, if the control data of a Byte and the 2nd Byte of storage are 0000111100001111 in control data memory module, when the first control foot C0 of LED drive chip U1 is low level, when second control foot C1, the 3rd control foot C2 of LED drive chip U2 and the 4th control foot C3 are high-impedance state, first group of LED shows according to the control data 0000111100001111 of a Byte and the 2nd Byte, 1 anode representing LED is high-impedance state, LED is bright, 0 anode representing LED is low level, and LED does not works.
As an embodiment of the present utility model, described electric current regulation data include 4Bit, the electric current of each LED drive chip U1 can carry out 16 different grades of regulations, and the electric current of described 4Bit regulates size of current corresponding to data 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 three:
This utility model the 3rd embodiment provides a kind of LED display, and described LED display includes the LED drive circuit that the second embodiment is provided.
In embodiment of the present utility model, described LED drive circuit includes that the LED drive chip of multiple cascade, described LED drive chip include: serial shift unit, driving control unit and shaping output unit；Described serial shift unit receives the control signal of outside in the way of single line communication, and control data corresponding with this LED drive chip in described control signal are intercepted, LED is driven controlling by described driving control unit according to described control data, and described shaping output unit exports after remaining data shaping after intercepting in described control signal.In embodiment of the present utility model, described LED drive circuit has only used a kind of chip can realize the control of the driving to LED, simplify circuit structure, reduce maintenance cost, and described LED drive circuit is driven controlling by the way of single line communication, simplifying communication protocol, reduce cascading errors, the electric current regulation data in control signal directly can carry out different grades of regulation to the output electric current of chip.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (11)
1. a LED drive chip, is used for driving LED, it is characterised in that described LED drive chip includes:
The control signal of outside, and the serial shift unit that control data corresponding with this LED drive chip in described control signal are intercepted is received in the way of single line communication；
It is connected with the outfan of described serial shift unit, the described control data that described serial shift unit intercepts are carried out the memory element preserved；
Being connected with the outfan of described memory element, the described control data intercepted according to described serial shift unit are driven the driving control unit controlled to corresponding LED；
Be connected with the outfan of described serial shift unit, by described control signal through described serial shift unit intercept after remaining data carry out shaping the shaping output unit exported.
2. a LED drive circuit, is connected with LED display module, and described LED display module includes multiple LED, it is characterised in that described LED drive circuit includes that the LED drive chip of multiple cascade, described LED drive chip include:
The control signal of outside, and the serial shift unit that control data corresponding with this LED drive chip in described control signal are intercepted is received in the way of single line communication；
It is connected with the outfan of described serial shift unit, the described control data that described serial shift unit intercepts are carried out the memory element preserved；
Being connected with the outfan of described memory element, the described control data intercepted according to described serial shift unit are driven the driving control unit controlled to the plurality of LED；
Be connected with the outfan of described serial shift unit, by described control signal through described serial shift unit intercept after remaining data carry out shaping and export the shaping output unit to rear class LED drive chip；
Described remaining data includes: control data corresponding with each LED drive chip of rear class respectively, and all of LED drive chip exports the electric current regulation data that electric current is adjusted；
The control signal input that input is described LED drive circuit of the serial shift unit of first LED drive chip.
3. LED drive circuit as claimed in claim 2, it is characterized in that, the form of described control signal is: the control data of control+the second LED drive chip of data of+the first LED drive chip of RESET signal+... the control data of+n-th LED drive chip+electric current regulation data, data in described control signal are high-order front, and low level is rear.
4. LED drive circuit as claimed in claim 3, it is characterized in that, each LED drive chip connects 4 groups of LED, the negative electrode of first group of LED is connected to the first control foot of described LED drive chip altogether, the negative electrode of second group of LED is connected to the second control foot of described LED drive chip altogether, the negative electrode of the 3rd group of LED is connected to the 3rd control foot of described LED drive chip altogether, and the negative electrode of the 4th group of LED is connected to the 4th control foot of described LED drive chip altogether.
5. LED drive circuit as claimed in claim 4, it is characterized in that, the number often organizing LED is 8, and the anode often organizing LED connects the first switch foot of described LED drive chip, second switch foot, the 3rd switch foot, the 4th switch foot, the 5th switch foot, the 6th switch foot, the 7th switch foot and the 8th switch foot respectively.
6. LED drive circuit as claimed in claim 5, it is characterized in that, the corresponding control data of each LED drive chip are 32Bit, the control data of each LED correspondence 1Bit, the memory capacity controlling data memory module in described memory element is 4Byte, and the control data correspondence of described 32Bit is stored in the control data memory module of described 4Byte.
7. LED drive circuit as claimed in claim 6, it is characterized in that, when the first control foot of described LED drive chip is low level, when second control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described first group of LED shows according to the control data of a Byte of storage in described control data memory module；When the second control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described second group of LED shows according to the control data of the 2nd Byte of storage in described control data memory module；When the 3rd control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 4th control foot are high-impedance state, described 3rd group of LED shows according to the control data of the 3rd Byte of storage in described control data memory module；When the 4th control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 3rd control foot are high-impedance state, described 4th group of LED shows according to the control data of the 4th Byte of storage in described control data memory module.
8. LED drive circuit as claimed in claim 4, it is characterized in that, the number often organizing LED is 16, often organizes that the anode of LED connects the first switch foot of described LED drive chip respectively, second switch foot, the 3rd switch foot, the 4th switch foot, the 5th switch foot, the 6th switch foot, the 7th switch foot, the 8th switch foot, the 9th switch foot, the tenth switch foot, the 11st switch foot, twelvemo are closed foot, the 13rd switch foot, the 14th switch foot, the 15th switch foot and sixteenmo and closed foot.
9. LED drive circuit as claimed in claim 8, it is characterized in that, the corresponding control data of each LED drive chip are 64Bit, the control data of each LED correspondence 1Bit, the memory capacity controlling data memory module in described memory element is 8Byte, and the control data correspondence of described 64Bit is stored in the control data memory module of described 8Byte.
10. LED drive circuit as claimed in claim 9, it is characterized in that, when the first control foot of described LED drive chip is low level, when second control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described first group of LED shows according to the control data of a Byte and the 2nd Byte of storage in described control data memory module；When the second control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the 3rd control foot and the 4th control foot are high-impedance state, described second group of LED shows according to the control data of the 3rd Byte and the 4th Byte of storage in described control data memory module；When the 3rd control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 4th control foot are high-impedance state, described 3rd group of LED shows according to the control data of the 5th Byte and the 6th Byte of storage in described control data memory module；When the 4th control foot of described LED drive chip is low level, when first control foot of described LED drive chip, the second control foot and the 3rd control foot are high-impedance state, described 4th group of LED shows according to the control data of the 7th Byte and the 8th Byte of storage in described control data memory module.
11. 1 kinds of LED displays, it is characterised in that described LED display includes the LED drive circuit as described in claim 2～10 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620185488.4U CN205454166U (en) | 2016-03-11 | 2016-03-11 | LED driver chip , LED drive circuit and LED display screen |
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| CN201620185488.4U CN205454166U (en) | 2016-03-11 | 2016-03-11 | LED driver chip , LED drive circuit and LED display screen |
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| CN205454166U true CN205454166U (en) | 2016-08-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657905A (en) * | 2016-03-11 | 2016-06-08 | 深圳市明微电子股份有限公司 | LED driving chip, LED driving circuit and LED display screen |
| CN110996461A (en) * | 2019-12-30 | 2020-04-10 | 南京浣轩半导体有限公司 | Single-wire LED data transmission display method and driving chip |
-
2016
- 2016-03-11 CN CN201620185488.4U patent/CN205454166U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105657905A (en) * | 2016-03-11 | 2016-06-08 | 深圳市明微电子股份有限公司 | LED driving chip, LED driving circuit and LED display screen |
| CN105657905B (en) * | 2016-03-11 | 2017-12-26 | 深圳市明微电子股份有限公司 | A kind of LED drive chip, LED drive circuit and LED display |
| CN110996461A (en) * | 2019-12-30 | 2020-04-10 | 南京浣轩半导体有限公司 | Single-wire LED data transmission display method and driving chip |
| CN110996461B (en) * | 2019-12-30 | 2021-03-02 | 南京浣轩半导体有限公司 | Single-wire LED data transmission display method and driving chip |
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Effective date of registration: 20180813 Address after: 361000 Fujian Xiamen torch high tech Zone (Xiangan) Industrial Zone, Xiangan West Road, block E6, 8065. Patentee after: fujian qiangli photoelectricity co., ltd. Address before: 518000 National Micro R&D Building No.015, High-tech South Road, South District, Nanshan Hi-tech Industrial Park, Shenzhen City, Guangdong Province Patentee before: Shenzhen Mingwei Electronic Co., Ltd. |