CN205722740U - The drive circuit of the mono-double-colored screen of a kind of LED and driving chip - Google Patents
The drive circuit of the mono-double-colored screen of a kind of LED and driving chip Download PDFInfo
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- CN205722740U CN205722740U CN201620424112.4U CN201620424112U CN205722740U CN 205722740 U CN205722740 U CN 205722740U CN 201620424112 U CN201620424112 U CN 201620424112U CN 205722740 U CN205722740 U CN 205722740U
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Abstract
The utility model is applicable to field of LED drive, drive circuit and the driving chip of the mono-double-colored screen of a kind of LED are provided, described drive circuit includes shift register, data latches, electric current drives module, current source, first electronic switch, second electronic switch, 3rd electronic switch, 4th electronic switch, time delay module, current regulating module and output port, current regulating module is connected with current source, it is adjusted with the output electric current to current source, shift register input gray level data when rising edge clock signal, and when the rising edge of latch signal, it is latched into data in data latches；Output port is opened when gradation data is 0 and outputs data to external LED by recommending the way of output.The utility model is by arranging the current regulating module being connected with current source so that the electric current of current source can be adjusted, and is not affected by its output voltage, so that the picture shown by the mono-double-colored screen of LED is evenly.
Description
Technical field
The utility model belongs to field of LED drive, particularly relates to drive circuit and the driving core of the mono-double-colored screen of a kind of LED
Piece.
Background technology
LED display is to develop fashionable novel information media device in recent years rapidly in the whole world, and it has environment
A series of advantages such as adaptable, brightness is high, energy-conserving and environment-protective, bright in luster, changing style.Dynamic menu and literary composition can be shown
Word, resolution ratio is high, is widely used in display field.Wherein, the mono-double-color display screen of LED is widely used in universal collection
Become in the drive circuit of circuit.
But, the mono-double-color display screen of traditional LED generally uses the LED drive chip of two 8 passages, and its output electric current is subject to
The voltage influence of output port, and output electric current can not regulate, the display picture causing display screen is uneven, thus has a strong impact on
The display effect of display screen.
Utility model content
The purpose of this utility model is to provide drive circuit and the driving chip of the mono-double-colored screen of a kind of LED, it is intended to solve
The mono-double-color display screen of traditional LED generally uses the LED drive chip of two 8 passages, and its output electric current is by the electricity of output port
Pressure affects, and output electric current can not be regulated, and the display picture causing display screen is uneven, thus has had a strong impact on the aobvious of display screen
The problem showing effect.
The utility model is achieved in that the drive circuit of the mono-double-colored screen of a kind of LED, and described drive circuit includes displacement
The 52nd, register the 10th, data latches the 20th, electric current drives module the 30th, current source the 40th, the first electronic switch the 51st, the second electronic switch
3rd electronic switch the 53rd, the 4th electronic switch the 54th, time delay module the 60th, current regulating module 70 and output port；
The gradation data by the first electronic switch 51 incoming serial for the serial data input of shift register 10, moves
The clock signal input terminal of bit register 10 passes through the second electronic switch 52 input clock signal, the serial number of shift register 10
Input according to output termination time delay module 60；
The parallel data output of the parallel data input termination shift register 10 of data latches 20, data latches
The latch signal input of 20 passes through the 3rd electronic switch 53 input and latch signal；
Electric current drives the parallel data input termination data latches 20 of module 30, and electric current drives the enable input of module 30
End enables signal by the 4th electronic switch 54 input；
The parallel data input termination electric current of current source 40 drives module 30, and the parallel data output of current source 40 passes through
The external LED of described output port；
The output of time delay module 60 is as the cascade port of external next stage drive circuit；
Current regulating module 70 is connected with current source 40, is adjusted with the output electric current to current source 40；
Shift register 10 inputs described gradation data when described rising edge clock signal, and at described latch signal
During rising edge, output data to data latch 20 latches；
Described output port open when described gradation data is 0 and by recommending the way of output and outputting data to it outside
The LED connecing.
Preferably, the resistance of the external output electric current for regulating current source 40 of current regulating module 70.
Preferably, current regulating module 70 is adjusted by the output electric current in external described resistance versus current source 40
Adjustable range is 18mA～45mA.
Preferably, the computing formula of the I of the output electric current of described current source 40 is:
Wherein, VRFor the output voltage of current regulating module 70, R is the resistance of described resistance, and G is the electric current of current source 40
Gain.
Preferably, described first electronic switch the 51st, the second electronic switch the 52nd, the 3rd electronic switch 53 and the 4th electronic switch
54 are Schmidt trigger or triode.
Preferably, shift register 10 is 16 bit shift register, and data latches 20 is 16 bit data latch, electric current
Driving module 30 to be that 16 electric currents drive module, current source 40 is 16 continuous current sources, and corresponding, described output port is 16
Position output port.
The utility model also provides a kind of LED driving chip of mono-double-colored screen, including highly integrated such as front any one institute
The drive circuit of the mono-double-colored screen of LED stated.
Compared with prior art, it has the beneficial effects that the utility model:
By arranging the current regulating module being connected with current source so that the current adjustment of current source, not by its output electricity
The impact of pressure, so that the picture shown by LED display is evenly；
By making current regulating module outer meeting resistance, can conveniently the output electric current of current source be adjusted；
Drive module, 16 continuous current sources by selecting 16 bit shift register, 16 bit data latch, 16 electric currents
With 16 output ports, overcome the peripheral components mistake that traditional LED display uses two 8 channels drive circuit to be brought
Problem many, that wiring is complicated.
Brief description
Fig. 1 is the structured flowchart of the drive circuit of the mono-double-colored screen of LED that the utility model embodiment provides；
Fig. 2 is the structured flowchart of the drive circuit of the mono-double-colored screen of LED that another embodiment of the utility model provides；
Fig. 3 is the packaging pin figure of the driving chip of the mono-double-colored screen of LED that the utility model embodiment provides；
When Fig. 4 is the driving chip signal in actual applications of LED mono-double-colored screen that the utility model embodiment provides
Sequence figure.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein only in order to explain this
Utility model, is not used to limit the utility model.
Fig. 1 is the basic structure block diagram of the drive circuit of the mono-double-colored screen of LED that the utility model embodiment provides.
As it is shown in figure 1, the drive circuit of the mono-double-colored screen of LED of the present embodiment offer, described drive circuit includes that displacement is posted
Storage the 10th, data latches the 20th, electric current drives module the 30th, current source the 40th, the first electronic switch the 51st, the second electronic switch the 52nd, the
Three electronic switches the 53rd, the 4th electronic switch the 54th, time delay module the 60th, current regulating module 70 and output port (in figure 1, output
Mouth is n position output port, is expressed as OUT0～OUTn)；
The gradation data SDI by the first electronic switch 51 incoming serial for the serial data input of shift register 10,
The clock signal input terminal of shift register 10 passes through the second electronic switch 52 input clock signal CLK, shift register 10
Serial data output terminal connects the input of time delay module 60；
The parallel data output of the parallel data input termination shift register 10 of data latches 20, data latches
The latch signal input of 20 passes through the 3rd electronic switch 53 input and latch signal LE；
Electric current drives the parallel data input termination data latches 20 of module 30, and electric current drives the enable input of module 30
End enables signal O by the 4th electronic switch 54 input；
The parallel data input termination electric current of current source 40 drives module 30, and the parallel data output of current source 40 passes through
Output port OUT0～external LED of OUTn；
The output of time delay module 60 is as the cascade port SDO of external next stage drive circuit；
Current regulating module 70 is connected with current source 40, is adjusted with the output electric current to current source 40；
Shift register 10 input gray level data SDI when clock signal clk rising edge, and described latch signal LE's
During rising edge, output data to data latch 20 latches；
Output port OUT0～OUTn opens when described gradation data SDI=0 and by recommending way of output output number
According to extremely external LED.
In the present embodiment, the resistance R of the external output electric current for regulating current source 40 of current regulating module 70.
In a particular application, the input of the 3rd electronic switch 53 is grounded GND, the 4th electronic switch 54 also by resistance R1
Input also by resistance R2 external power supply VDD.
In a preferred embodiment, current regulating module 70 is carried out by the output electric current to current source 40 for the outer meeting resistance R
The adjustable range of regulation is 18mA～45mA.
The computing formula of the I of the output electric current of described current source 40 is:
Wherein, VRFor the output voltage of current regulating module 70, R is the resistance of resistance R, and G is that the electric current of current source 40 increases
Benefit.
The mesh output electric current of current source 40 being adjusted by selecting the resistance R with different resistance to realize
So that it is do not affected by output voltage, so that the picture shown by LED display is evenly.
Fig. 2 is the structured flowchart of the drive circuit of the mono-double-colored screen of LED that another embodiment of the utility model provides.
As in figure 2 it is shown, the drive circuit of the mono-double-colored screen of LED of the present embodiment offer is the drive circuit shown in Fig. 1
Limit further.
In a particular application, the first electronic switch the 51st, the second electronic switch the 52nd, the 3rd electronic switch 53 and the 4th electronic cutting
Close 54 and all can be selected for Schmidt trigger or triode, in the present embodiment, preferably first electronic switch the 51st, the second electronic switch
52nd, the 3rd electronic switch 53 and the 4th electronic switch 54 are Schmidt trigger.
In the present embodiment, preferably shift register 10 is 16 bit shift register, and data latches 20 is 16 bit data
Latch, it is that 16 electric currents drive module that electric current drives module 30, and current source 40 is 16 continuous current sources, corresponding, output
Port OUT0～OUTn is sixteen bit output port OUT0～OUT15.
Drive module, 16 continuous current sources by selecting 16 bit shift register, 16 bit data latch, 16 electric currents
And 16 output ports, overcome the peripheral components mistake that traditional LED display uses two 8 channels drive circuit to be brought
Problem many, that wiring is complicated.
Fig. 3 is the packaging pin figure of the driving chip of the mono-double-colored screen of LED that the utility model embodiment provides.
As it is shown on figure 3, the driving chip of the mono-double-colored screen of LED that the present embodiment provides include highly integrated as shown in Figure 1
The drive circuit of the mono-double-colored screen of LED.
In the present embodiment, each pin of described driving chip is as follows with the corresponding relation of described drive circuit:
16 current output terminals of 0～No. 15 pin OUT0～OUT15 corresponding described 16 current source 40 respectively；
No. 1 pin GND is the earth terminal GND being connected with the 3rd electronic switch 53；
No. 2 pin SDI are gradation data SDI to 16 bit shift for incoming serial being connected with the first electronic switch 51
The serial data input of register 10；
No. 3 pin CLK are used for input clock signal CLK to 16 bit shift register for be connected with the second electronic switch 52
The clock signal input terminal of 10；
No. 4 pin LE are used for input and latch signal to 16 bit data latch 20 for be connected with the 3rd electronic switch 53
Latch signal input；
No. 24 pin VDD are the power end VDD being connected with the 4th electronic switch 54；
No. 23 pin R are the outer meeting resistance end for outer meeting resistance being connected with current regulating module 70；
No. 22 pin SDO are the level being used for making 16 bit shift register 10 export serial data connecting with time delay module 60
Connection port SDO；
No. 21 pin O enable signal to 16 electric currents driving modules for be connected with the 4th electronic switch 54 for inputting
Enable signal input part.
When Fig. 4 is the driving chip signal in actual applications of LED mono-double-colored screen that the utility model embodiment provides
Sequence figure.
As shown in Figure 4, described driving chip is in rising edge input gray level data SDI extremely described 16 of clock signal clk
Shift register, and by cascading port SDO by serial data transmission to next stage driving chip；
At the rising edge of latch signal LE, the parallel output terminal of described 16 bit shift register outputs data to described 16
Data latches latches, and the parallel output terminal of described 16 bit data register outputs data to described 16 electric currents and drives mould
Block；
When enable signal O is effective, described 16 electric currents drive module according to the ash of described 16 bit shift register inputs
Degrees of data SDI determines whether the output OUT1～OUT15 of described 16 current sources opens (during SDI=0, for opening ON；SDI
When=1, for being not turned on OFF), current signal is transferred to the LED being connected with this output by the output being unlocked；
SDO pin exports to the signal of next stage driving chip not within the protection domain that the utility model limits, therefore
Do not elaborate, figure uses and disuses concern and represents.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all at this
Any modification, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in the utility model
Protection domain within.
Claims (7)
1. the drive circuit of the mono-double-colored screen of a LED, it is characterised in that described drive circuit includes shift register (10), number
According to latch (20), electric current drive module (30), current source (40), the first electronic switch (51), the second electronic switch (52), the
Three electronic switches (53), the 4th electronic switch (54), time delay module (60), current regulating module (70) and output port；
The gradation data by the first electronic switch (51) incoming serial for the serial data input of shift register (10), displacement
The clock signal input terminal of register (10) passes through the second electronic switch (52) input clock signal, the string of shift register (10)
Row data output end connects the input of time delay module (60)；
The parallel data output of parallel data input termination shift register (10) of data latches (20), data latches
(20) latch signal input passes through the 3rd electronic switch (53) input and latch signal；
Electric current drives parallel data input termination data latches (20) of module (30), and electric current drives the enable of module (30) defeated
Enter end and enable signal by the 4th electronic switch (54) input；
The parallel data input termination electric current of current source (40) drives module (30), and the parallel data output of current source (40) leads to
Cross the external LED of described output port；
The output of time delay module (60) is as the cascade port of external next stage drive circuit；
Current regulating module (70) is connected with current source (40), is adjusted with the output electric current to current source (40)；
Shift register (10) inputs described gradation data when described rising edge clock signal, and upper at described latch signal
Rise along when, output data to data latch (20) is latched；
Described output port is opened when described gradation data is 0 and outputs data to external with it by recommending the way of output
LED。
2. the drive circuit of the mono-double-colored screen of LED as claimed in claim 1, it is characterised in that current regulating module (70) is external
For regulating the resistance of the output electric current of current source (40).
3. the drive circuit of the mono-double-colored screen of LED as claimed in claim 2, it is characterised in that current regulating module (70) is passed through
The adjustable range that the output electric current of external described resistance versus current source (40) is adjusted is 18mA～45mA.
4. the drive circuit of the mono-double-colored screen of LED as claimed in claim 2, it is characterised in that the output of described current source (40)
The computing formula of the I of electric current is:
Wherein, VRFor the output voltage of current regulating module (70), R is the resistance of described resistance, and G is the electric current of current source (40)
Gain.
5. the drive circuit of the mono-double-colored screen of LED as claimed in claim 1, it is characterised in that described first electronic switch (51),
Second electronic switch (52), the 3rd electronic switch (53) and the 4th electronic switch (54) are Schmidt trigger or triode.
6. the drive circuit of the mono-double-colored screen of the LED as described in any one of Claims 1 to 5, it is characterised in that shift register
(10) being 16 bit shift register, data latches (20) is 16 bit data latch, and it is 16 electricity that electric current drives module (30)
Stream drives module, and current source (40) is 16 continuous current sources, corresponding, and described output port is 16 output ports.
7. the driving chip of the mono-double-colored screen of a LED, it is characterised in that include highly integrated such as any one of claim 1～6
The drive circuit of the mono-double-colored screen of described LED.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620424112.4U CN205722740U (en) | 2016-05-11 | 2016-05-11 | The drive circuit of the mono-double-colored screen of a kind of LED and driving chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620424112.4U CN205722740U (en) | 2016-05-11 | 2016-05-11 | The drive circuit of the mono-double-colored screen of a kind of LED and driving chip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107358912A (en) * | 2017-08-18 | 2017-11-17 | 深圳市德普微电子有限公司 | A kind of single dual-colored LED display screen drive chip |
| CN110070827A (en) * | 2019-05-22 | 2019-07-30 | 深圳市富满电子集团股份有限公司 | LED display driver IC, latch signal generation method and system |
| CN110288939A (en) * | 2019-04-24 | 2019-09-27 | 上海大学 | LED display constant-current driven chip based on control serial transmission |
| CN110753424A (en) * | 2019-10-31 | 2020-02-04 | 上海灵信视觉技术股份有限公司 | Pin definition and drive circuit of LED drive chip |
-
2016
- 2016-05-11 CN CN201620424112.4U patent/CN205722740U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107358912A (en) * | 2017-08-18 | 2017-11-17 | 深圳市德普微电子有限公司 | A kind of single dual-colored LED display screen drive chip |
| CN110288939A (en) * | 2019-04-24 | 2019-09-27 | 上海大学 | LED display constant-current driven chip based on control serial transmission |
| CN110288939B (en) * | 2019-04-24 | 2021-04-09 | 上海大学 | LED display screen constant current driving chip based on control serial transmission |
| CN110070827A (en) * | 2019-05-22 | 2019-07-30 | 深圳市富满电子集团股份有限公司 | LED display driver IC, latch signal generation method and system |
| CN110070827B (en) * | 2019-05-22 | 2023-05-23 | 富满微电子集团股份有限公司 | LED display screen driving chip, latch signal generation method and system |
| CN110753424A (en) * | 2019-10-31 | 2020-02-04 | 上海灵信视觉技术股份有限公司 | Pin definition and drive circuit of LED drive chip |
| CN110753424B (en) * | 2019-10-31 | 2021-11-09 | 上海灵信视觉技术股份有限公司 | Driving circuit defined by pins based on LED driving chip |
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